chore(main): release 6.1.2 (#1761)

Release-As: 6.1.2

.generatelicensefile.json

@@ -0,0 +1,6 @@
+{
+  "inputs": ["./package.json"],
+  "output": "./THIRD-PARTY",
+  "overwrite": true,
+  "ci": true
+}

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,9 +1,11 @@
-*Issue #, if available:*
+_Issue #, if available:_
 
-*Description of changes:*
+_Description of changes:_
 
 ---
 
-* [ ] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws-actions/configure-aws-credentials/blob/main/CONTRIBUTING.md)
+- [ ] Have you followed the guidelines in our
+      [Contributing guide?](https://github.com/aws-actions/configure-aws-credentials/blob/main/CONTRIBUTING.md)
 
-By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.
+By submitting this pull request, I confirm that you can use, modify, copy, and
+redistribute this contribution, under the terms of your choice.

.github/workflows/automerge-approved-prs.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Configure AWS credentials
-        uses: aws-actions/configure-aws-credentials@v4
+        uses: aws-actions/configure-aws-credentials@v6
         with:
           aws-region: us-west-2
           role-to-assume: ${{ secrets.SECRETS_AWS_PACKAGING_ROLE_TO_ASSUME }}

.github/workflows/dependabot-autoapprove.yml

@@ -15,10 +15,10 @@ jobs:
       - name: Get Metadata
         id: dependabot-metadata
         uses: dependabot/fetch-metadata@v2
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         name: Clone repo
       - name: Configure AWS credentials
-        uses: aws-actions/configure-aws-credentials@v4
+        uses: aws-actions/configure-aws-credentials@v6
         with:
           aws-region: us-west-2
           role-to-assume: ${{ secrets.CONFIGUREAWSCREDENTIALSPACKAGEROLEARN }}

.github/workflows/package-dist.yml

@@ -17,7 +17,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
           ref: ${{ github.ref_name }}
@@ -28,7 +28,7 @@ jobs:
           npm test
           npm run package
       - name: Configure AWS credentials
-        uses: aws-actions/configure-aws-credentials@v4
+        uses: aws-actions/configure-aws-credentials@v6
         with:
           aws-region: us-west-2
           role-to-assume: ${{ secrets.SECRETS_AWS_PACKAGING_ROLE_TO_ASSUME }}
@@ -47,5 +47,6 @@ jobs:
           git config user.email "github-aws-sdk-osds-automation@amazon.com"
           git remote set-url origin https://${{ env.OSDS_ACCESS_TOKEN }}@github.com/aws-actions/configure-aws-credentials.git
           git add dist
+          git add THIRD-PARTY
           git commit -m "chore: Update dist" || echo "No changes to commit"
           git push --force origin

.github/workflows/release-please.yml

@@ -4,6 +4,7 @@
     push:
       branches:
         - main
+    workflow_dispatch:
 
   permissions:
     id-token: write
@@ -15,12 +16,12 @@
       runs-on: ubuntu-latest
       steps:
         - name: Checkout Repository
-          uses: actions/checkout@v4
+          uses: actions/checkout@v5
           with:
             fetch-depth: 0
 
         - name: Configure AWS Credentials
-          uses: aws-actions/configure-aws-credentials@v4
+          uses: aws-actions/configure-aws-credentials@v6
           with:
             aws-region: us-west-2
             role-to-assume: ${{ secrets.SECRETS_AWS_PACKAGING_ROLE_TO_ASSUME }}
@@ -41,3 +42,4 @@
             token: ${{ env.OSDS_ACCESS_TOKEN }}
             config-file: release-please-config.json
             manifest-file: .release-please-manifest.json
+            

.github/workflows/tests-integ-release.yml

@@ -1,12 +1,13 @@
 name: Run pre-release integ tests
 on: 
     pull_request_target:
+    workflow_dispatch:
 permissions:
     contents: read
 
 jobs:
   oidc:
-    if: ${{ github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials' }}
+    if: ${{ github.event_name == 'workflow_dispatch' || (github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials') }}
     permissions: 
         id-token: write
     strategy: 
@@ -32,12 +33,17 @@ jobs:
 
   #can cut this test out if it's not necessary
   static_assumeRole:
-    if: ${{ github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials' }}
+    if: ${{ github.event_name == 'workflow_dispatch' || (github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials') }}
+    permissions:
+        id-token: write
     strategy: 
         fail-fast: false
         matrix:
             os: [windows-latest, ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
+    defaults: 
+        run:
+            shell: bash
     name: Static IAM creds test
     steps:
       - name: checkout
@@ -45,19 +51,45 @@ jobs:
         with:
             fetch-depth: 0
             persist-credentials: false
-      - name: Configure AWS credentials
+      - name: assume creator Role
         uses: ./
         with:
             aws-region: us-west-2
-            aws-access-key-id: ${{ secrets.STATIC_ak_id }}
-            aws-secret-access-key: ${{ secrets.STATIC_secret_ak }}
-            role-to-assume: ${{ secrets.STATIC_role }}
-      - name: Get Caller Identity
+            role-to-assume: ${{ secrets.STATIC_USER_CREATION_ROLE }}
+      - name: create and mask access key
+        id: create-key
+        run: | 
+            AK_OUTPUT=$(aws iam create-access-key --user-name integ-test-static-user-${{ runner.os }})
+            AK_ID=$(echo $AK_OUTPUT | jq -r '.AccessKey.AccessKeyId')
+            SECRET_AK=$(echo $AK_OUTPUT | jq -r '.AccessKey.SecretAccessKey')
+            echo "::add-mask::$AK_ID"
+            echo "::add-mask::$SECRET_AK"
+            echo "STATIC_ACCESS_KEY_ID=$AK_ID" >> $GITHUB_OUTPUT
+            echo "STATIC_SECRET_ACCESS_KEY=$SECRET_AK" >> $GITHUB_OUTPUT
+      - name: sleep so key can propagate
+        run: sleep 30
+      - name: assume role with static creds
+        uses: ./
+        with:
+            aws-region: us-west-2
+            role-to-assume: ${{ secrets.STATIC_TEST_TARGET_ROLE }}
+            aws-access-key-id: ${{ steps.create-key.outputs.STATIC_ACCESS_KEY_ID }}
+            aws-secret-access-key: ${{ steps.create-key.outputs.STATIC_SECRET_ACCESS_KEY }}
+      - name: check account
+        run: aws sts get-caller-identity
+      - name: log back into creator role
+        if: success() || failure()
+        uses: ./
+        with:
+            aws-region: us-west-2
+            role-to-assume: ${{ secrets.STATIC_USER_CREATION_ROLE }}
+      - name: delete access key
+        if: success() || failure()
         run: |
-          aws sts get-caller-identity
+            aws iam delete-access-key --user-name integ-test-static-user-${{ runner.os }} --access-key-id ${{ steps.create-key.outputs.STATIC_ACCESS_KEY_ID }}
 
   role_chaining:
-    if: ${{ github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials' }}
+    if: ${{ github.event_name == 'workflow_dispatch' || (github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials') }}
     permissions: 
         id-token: write
     strategy: 
@@ -91,7 +123,7 @@ jobs:
           aws sts get-caller-identity
 
   inline_policy:
-    if: ${{ github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials' }}
+    if: ${{ github.event_name == 'workflow_dispatch' || (github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials') }}
     permissions: 
         id-token: write
     strategy: 
@@ -129,7 +161,7 @@ jobs:
         run: exit 1
 
   http-proxy:
-    if: ${{ github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials' }}
+    if: ${{ github.event_name == 'workflow_dispatch' || (github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials') }}
     permissions:
         id-token: write
     runs-on: ubuntu-latest
@@ -163,7 +195,7 @@ jobs:
         run: exit 1
 
   token-file:
-    if: ${{ github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials' }}
+    if: ${{ github.event_name == 'workflow_dispatch' || (github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials') }}
     permissions:
         id-token: write
     strategy: 
@@ -179,7 +211,7 @@ jobs:
             fetch-depth: 0
             persist-credentials: false
       - name: fetch token and write to file
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             const fs = require('fs');
@@ -200,3 +232,50 @@ jobs:
             retry-max-attempts: 4
       - name: check creds
         run: aws sts get-caller-identity
+
+  profile-oidc:
+    if: ${{ github.event_name == 'workflow_dispatch' || (github.event.pull_request.user.login == 'aws-sdk-osds' && github.repository == 'aws-actions/configure-aws-credentials') }}
+    permissions: 
+        id-token: write
+    strategy: 
+        fail-fast: false
+        matrix:
+            os: [windows-latest, ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    name: OIDC profile writing test
+    steps:
+      - name: checkout
+        uses: actions/checkout@v5
+        with:
+            fetch-depth: 0
+            persist-credentials: false
+
+      - name: make profile 1
+        uses: ./
+        with: 
+          aws-region: us-east-1
+          role-to-assume: ${{ secrets.INTEG_PROFILE_ROLE_1 }}
+          aws-profile: TestProfile1
+
+      - name: make profile 2
+        uses: ./
+        with: 
+          aws-region: us-east-2
+          role-to-assume: ${{ secrets.INTEG_PROFILE_ROLE_2 }}
+          aws-profile: TestProfile2
+          
+      - name: check profile1 
+        run: aws sts get-caller-identity --profile TestProfile1
+      
+      - name: check profile2
+        run: aws sts get-caller-identity --profile TestProfile2
+
+      - name: Get Caller Identity
+        id: no-creds-sts-step
+        continue-on-error: true
+        run: |
+            aws sts get-caller-identity
+
+      - name: fail if we got caller id with env creds
+        if: steps.no-creds-sts-step.outcome == 'success'
+        run: exit 1

.github/workflows/tests-unit.yml

@@ -31,7 +31,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: "Checkout repostiory"
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: "Setup node"
         uses: actions/setup-node@v4
         with:

.markdownlint.yaml

@@ -0,0 +1,17 @@
+default: true
+MD007:
+  indent: 4
+heading-style:
+  style: atx
+ul-style:
+  style: dash
+line-length:
+  stern: true
+  tables: false
+  code_blocks: false
+no-inline-html:
+  allowed_elements:
+    - details
+    - summary
+code-block-style:
+  style: fenced

.release-please-manifest.json

@@ -1,5 +1,5 @@
 {
   ".release-please-manifest.json": "4.0.2",
-  "package.json": "4.0.2",
-  ".": "5.0.0"
+  "package.json": "6.0.0",
+  ".": "6.1.2"
 }

CHANGELOG.md

@@ -2,6 +2,75 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [6.1.2](https://github.com/aws-actions/configure-aws-credentials/compare/v6.1.1...v6.1.2) (2026-05-26)
+
+
+### Features
+
+* add additional session tags by default ([#1775](https://github.com/aws-actions/configure-aws-credentials/issues/1775)) ([e0ba768](https://github.com/aws-actions/configure-aws-credentials/commit/e0ba7685077379a14a82d01fefd511490344ebfc))
+* add more retry logic and better logging ([#1764](https://github.com/aws-actions/configure-aws-credentials/issues/1764)) ([540d0c1](https://github.com/aws-actions/configure-aws-credentials/commit/540d0c13aedb8d55501d220bd2f0b3cdedfe84e8))
+* add regex validation to role-session-name ([#1765](https://github.com/aws-actions/configure-aws-credentials/issues/1765)) ([e354499](https://github.com/aws-actions/configure-aws-credentials/commit/e35449909c6ede5083a48ba4b8bbfaaa1cf09ba1))
+* Allow custom session tags to be passed when assuming a role ([#1759](https://github.com/aws-actions/configure-aws-credentials/issues/1759)) ([61f50f6](https://github.com/aws-actions/configure-aws-credentials/commit/61f50f630f383628add73c1eab3f1935ba07da2b))
+* expose run id in STS client user-agent ([#1774](https://github.com/aws-actions/configure-aws-credentials/issues/1774)) ([29d1be3](https://github.com/aws-actions/configure-aws-credentials/commit/29d1be30273e7ef371d59fccf6ec54572c64ec89))
+* support custom STS endpoints ([#1762](https://github.com/aws-actions/configure-aws-credentials/issues/1762)) ([8d52d05](https://github.com/aws-actions/configure-aws-credentials/commit/8d52d05d7a4521fa52b39de50cb6114b12e5c332))
+
+
+### Bug Fixes
+
+* additional filesystem checks ([#1799](https://github.com/aws-actions/configure-aws-credentials/issues/1799)) ([c39f282](https://github.com/aws-actions/configure-aws-credentials/commit/c39f282697aca8a78c522ecf1f7da9899a31432c))
+* skip credential check on output-env-credentials: false ([#1778](https://github.com/aws-actions/configure-aws-credentials/issues/1778)) ([58e7c47](https://github.com/aws-actions/configure-aws-credentials/commit/58e7c47adf77846879008deadfeeef8a6969fe6c))
+
+## [6.1.1](https://github.com/aws-actions/configure-aws-credentials/compare/v6.1.0...v6.1.1) (2026-05-05)
+
+
+### Miscellaneous Chores
+
+* various dependency updates
+
+## [6.1.0](https://github.com/aws-actions/configure-aws-credentials/compare/v6.0.0...v6.1.0) (2026-04-06)
+
+
+### Features
+
+* add skip cleanup option ([#1716](https://github.com/aws-actions/configure-aws-credentials/issues/1716)) ([11b1c58](https://github.com/aws-actions/configure-aws-credentials/commit/11b1c58b24724e66aa52a847862a0c1b0c4b0c7b)), closes [#1545](https://github.com/aws-actions/configure-aws-credentials/issues/1545)
+* Support usage of AWS Profiles ([#1696](https://github.com/aws-actions/configure-aws-credentials/issues/1696)) ([a7f0c82](https://github.com/aws-actions/configure-aws-credentials/commit/a7f0c828ac76e0d049e34c920172c60f579f9eb3))
+
+## [6.0.0](https://github.com/aws-actions/configure-aws-credentials/compare/v5.1.1...v6.0.0) (2026-02-04)
+
+
+### ⚠ BREAKING CHANGES
+
+* Update action to use node24 ([#1632](https://github.com/aws-actions/configure-aws-credentials/pull/1632)) ([a7a2c11](https://github.com/aws-actions/configure-aws-credentials/commit/a7a2c1125c67f40a1e95768f4e4a7d8f019f87af))
+
+### Features
+
+* add support to define transitive tag keys ([#1316](https://github.com/aws-actions/configure-aws-credentials/pull/1316)) ([232435c](https://github.com/aws-actions/configure-aws-credentials/commit/232435c0c05e51137544f0203931b84893d13b74)) ([930ebd9](https://github.com/aws-actions/configure-aws-credentials/pull/1628/changes/930ebd9bcaed959c3ba9e21567e8abbc3cae72c0))
+
+### Bug Fixes
+
+* properly output `aws-account-id` and `authenticated-arn` when using role-chaining ([#1633](https://github.com/aws-actions/configure-aws-credentials/pull/1633)) ([7ceaf96](https://github.com/aws-actions/configure-aws-credentials/commit/7ceaf96edc86cc1713cef59eba79feeb23f59da1))
+
+## [5.1.1](https://github.com/aws-actions/configure-aws-credentials/compare/v5.1.0...v5.1.1) (2025-11-24)
+
+
+### Miscellaneous Chores
+
+* release 5.1.1 ([56d6a58](https://github.com/aws-actions/configure-aws-credentials/commit/56d6a583f00f6bad6d19d91d53a7bc3b8143d0e9))
+
+## [5.1.0](https://github.com/aws-actions/configure-aws-credentials/compare/v5.0.0...v5.1.0) (2025-10-06)
+
+
+### Features
+
+* Add global timeout support ([#1487](https://github.com/aws-actions/configure-aws-credentials/issues/1487)) ([1584b8b](https://github.com/aws-actions/configure-aws-credentials/commit/1584b8b0e2062557287c28fbe9b8920df434e866))
+* add no-proxy support ([#1482](https://github.com/aws-actions/configure-aws-credentials/issues/1482)) ([dde9b22](https://github.com/aws-actions/configure-aws-credentials/commit/dde9b22a8e889a0821997a21a2c5a38020ee8de3))
+* Improve debug logging in retry logic ([#1485](https://github.com/aws-actions/configure-aws-credentials/issues/1485)) ([97ef425](https://github.com/aws-actions/configure-aws-credentials/commit/97ef425d73aa532439f54f90d0e83101a186c5a6))
+
+
+### Bug Fixes
+
+* properly expose getProxyForUrl (introduced in [#1482](https://github.com/aws-actions/configure-aws-credentials/issues/1482)) ([#1486](https://github.com/aws-actions/configure-aws-credentials/issues/1486)) ([cea4298](https://github.com/aws-actions/configure-aws-credentials/commit/cea42985ac88b42678fbc84c18066a7f07f05176))
+
 ## [5.0.0](https://github.com/aws-actions/configure-aws-credentials/compare/v4.3.1...v5.0.0) (2025-09-03)
 
 

CODE_OF_CONDUCT.md

@@ -1,4 +1,8 @@
-## Code of Conduct
-This project has adopted the [Amazon Open Source Code of Conduct](https://aws.github.io/code-of-conduct).
-For more information see the [Code of Conduct FAQ](https://aws.github.io/code-of-conduct-faq) or contact
-opensource-codeofconduct@amazon.com with any additional questions or comments.
+# Code of Conduct
+
+This project has adopted the
+[Amazon Open Source Code of Conduct](https://aws.github.io/code-of-conduct). For
+more information see the
+[Code of Conduct FAQ](https://aws.github.io/code-of-conduct-faq) or contact
+<opensource-codeofconduct@amazon.com> with any additional questions or
+comments.

CONTRIBUTING.md

@@ -1,61 +1,117 @@
 # Contributing Guidelines
 
-Thank you for your interest in contributing to our project. Whether it's a bug report, new feature, correction, or additional
-documentation, we greatly value feedback and contributions from our community.
-
-Please read through this document before submitting any issues or pull requests to ensure we have all the necessary
-information to effectively respond to your bug report or contribution.
+Thank you for your interest in contributing to our project. Whether it's a bug
+report, new feature, correction, or additional documentation, we greatly value
+feedback and contributions from our community.
 
+Please read through this document before submitting any issues or pull requests
+to ensure we have all the necessary information to effectively respond to your
+bug report or contribution.
 
 ## Reporting Bugs/Feature Requests
 
-We welcome you to use the GitHub issue tracker to report bugs or suggest features.
+We welcome you to use the GitHub issue tracker to report bugs or suggest
+features.
 
-When filing an issue, please check [existing open](https://github.com/aws-actions/configure-aws-credentials/issues), or [recently closed](https://github.com/aws-actions/configure-aws-credentials/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aclosed%20), issues to make sure somebody else hasn't already
-reported the issue. Please try to include as much information as you can. Details like these are incredibly useful:
+When filing an issue, please check [existing open][open-issues],
+or [recently closed][closed-issues], issues to make sure somebody
+else hasn't already reported the issue.
 
-* A reproducible test case or series of steps
-* The version of our code being used
-* Any modifications you've made relevant to the bug
-* Anything unusual about your environment or deployment
+[open-issues]: https://github.com/aws-actions/configure-aws-credentials/issues
+[closed-issues]: https://github.com/aws-actions/configure-aws-credentials/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aclosed%20
 
+Please try to include as much information as you can. Details like
+these are incredibly useful:
+
+- A reproducible test case or series of steps
+- The version of our code being used
+- Any modifications you've made relevant to the bug
+- Anything unusual about your environment or deployment
 
 ## Contributing via Pull Requests
-Contributions via pull requests are much appreciated. Before sending us a pull request, please ensure that:
 
-1. You are working against the latest source on the *main* branch.
-2. You check existing open, and recently merged, pull requests to make sure someone else hasn't addressed the problem already.
-3. You open an issue to discuss any significant work - we would hate for your time to be wasted.
+Contributions via pull requests are much appreciated. Before sending us a pull
+request, please ensure that:
+
+1. You are working against the latest source on the _main_ branch.
+2. You check existing open, and recently merged, pull requests to make sure
+   someone else hasn't addressed the problem already.
+3. You open an issue to discuss any significant work - we would hate for your
+   time to be wasted.
 
 To send us a pull request, please:
 
 1. Fork the repository.
-2. Modify the source; please focus on the specific change you are contributing. If you also reformat all the code, it will be hard for us to focus on your change.
+2. Modify the source; please focus on the specific change you are contributing.
+   If you also reformat all the code, it will be hard for us to focus on your
+   change.
 3. Ensure local tests pass.
 4. Commit to your fork using clear commit messages.
-5. Send us a pull request, answering any default questions in the pull request interface.
-6. Pay attention to any automated CI failures reported in the pull request, and stay involved in the conversation.
+5. Send us a pull request, answering any default questions in the pull request
+   interface.
+6. Pay attention to any automated CI failures reported in the pull request, and
+   stay involved in the conversation.
 
-GitHub provides additional document on [forking a repository](https://help.github.com/articles/fork-a-repo/) and
-[creating a pull request](https://help.github.com/articles/creating-a-pull-request/).
+GitHub provides additional document on
+[forking a repository](https://help.github.com/articles/fork-a-repo/) and
+[creating a pull request][create-pr].
 
+[create-pr]:
+  https://help.github.com/articles/creating-a-pull-request/
 
 ## Finding contributions to work on
-Looking at the existing issues is a great way to find something to contribute on. As our projects, by default, use the default GitHub issue labels (enhancement/bug/duplicate/help wanted/invalid/question/wontfix), looking at any ['help wanted'](https://github.com/aws-actions/configure-aws-credentials/labels/help%20wanted) issues is a great place to start.
 
+Looking at the existing issues is a great way to find something to contribute
+on. As our projects, by default, use the default GitHub issue labels
+(enhancement/bug/duplicate/help wanted/invalid/question/wontfix), looking at any
+['help wanted'](https://github.com/aws-actions/configure-aws-credentials/labels/help%20wanted)
+issues is a great place to start.
 
 ## Code of Conduct
-This project has adopted the [Amazon Open Source Code of Conduct](https://aws.github.io/code-of-conduct).
-For more information see the [Code of Conduct FAQ](https://aws.github.io/code-of-conduct-faq) or contact
-opensource-codeofconduct@amazon.com with any additional questions or comments.
 
+This project has adopted the
+[Amazon Open Source Code of Conduct](https://aws.github.io/code-of-conduct). For
+more information see the
+[Code of Conduct FAQ](https://aws.github.io/code-of-conduct-faq) or contact
+<opensource-codeofconduct@amazon.com> with any additional questions or
+comments.
 
 ## Security issue notifications
-If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security via our [vulnerability reporting page](http://aws.amazon.com/security/vulnerability-reporting/). Please do **not** create a public github issue.
 
+If you discover a potential security issue in this project we ask that you
+notify AWS/Amazon Security via our
+[vulnerability reporting page][vuln-report].
+
+[vuln-report]:
+  http://aws.amazon.com/security/vulnerability-reporting/
+Please do **not** create a public github issue.
+
+## Automated Tools
+
+The use of AI tooling for assisted development work is accepted and encouraged
+in this repository, but due to the volume of submissions we ask that you observe
+the following rules:
+
+- All issue and pull request submissions to this repository that are sourced by
+  AI must first be reviewed by a human before submitting to the repository.
+  Items reviewed in this way must include a statement like "generated by AI
+  tools, and reviewed by [person]"
+- Please ensure that your submissions are actually improvements. While we are
+  grateful for any proposed fixes, even if they are very small, behavior that
+  looks like creating noisy PRs or artificially inflating submission counts
+  is not acceptable.
+- We may close issues or pull requests, or limit your ability to interact with
+  this repository, for behavior that in our estimation violates these rules or
+  any of the other rules in this repository's
+  [Code of Conduct](CODE_OF_CONDUCT.md).
 
 ## Licensing
 
-See the [LICENSE](https://github.com/aws-actions/configure-aws-credentials/blob/main/LICENSE) file for our project's licensing. We will ask you to confirm the licensing of your contribution.
+See the
+[LICENSE](https://github.com/aws-actions/configure-aws-credentials/blob/main/LICENSE)
+file for our project's licensing. We will ask you to confirm the licensing of
+your contribution.
 
-We may ask you to sign a [Contributor License Agreement (CLA)](http://en.wikipedia.org/wiki/Contributor_License_Agreement) for larger changes.
+We may ask you to sign a
+[Contributor License Agreement (CLA)](http://en.wikipedia.org/wiki/Contributor_License_Agreement)
+for larger changes.

README.md

@@ -1,15 +1,17 @@
-Configure AWS Credentials
-=========================
-Authenticate to AWS in GitHub Actions! Works especially well with [AWS Secrets
-Manager](https://github.com/aws-actions/aws-secretsmanager-get-secrets).
+# Configure AWS Credentials
 
-Quick Start (OIDC, recommended)
--------------------------------
-1. Create an IAM Identity Provider in your AWS account for GitHub OIDC. (See 
-[OIDC configuration](#oidc-configuration) below for details.)
-2. Create an IAM Role in your AWS account with a trust policy that allows GitHub
-Actions to assume it:
-    <details>
+Authenticate to AWS in GitHub Actions! Works especially well with
+[AWS Secrets Manager][secretsmanager].
+
+[secretsmanager]:
+  https://github.com/aws-actions/aws-secretsmanager-get-secrets
+
+## Quick Start (OIDC, recommended)
+
+1. Create an IAM Identity Provider in your AWS account for GitHub OIDC. (See
+   [OIDC configuration](#oidc-configuration-details) below for details.)
+2. Create an IAM Role in your AWS account with a trust policy that allows
+    GitHub Actions to assume it. (Expand the sections below) <details>
     <summary>GitHub OIDC Trust Policy</summary>
 
     ```json
@@ -32,11 +34,12 @@ Actions to assume it:
       ]
     }
     ```
+
     </details>
-3. Attach permissions to the IAM Role that allow it to access the AWS resources 
-you need.
-4. Add the following to your GitHub Actions workflow:
-    <details>
+
+3. Attach permissions to the IAM Role that allow it to access the AWS resources
+    you need.
+4. Add the following to your GitHub Actions workflow: <details>
     <summary>Example Workflow</summary>
 
     ```yaml
@@ -48,39 +51,47 @@ you need.
         runs-on: ubuntu-latest
         steps:
           - name: Configure AWS Credentials
-            uses: aws-actions/configure-aws-credentials@main # Or a specific version
+            uses: aws-actions/configure-aws-credentials@v6.1.0
             with:
               role-to-assume: <Role ARN you created in step 2>
               aws-region: <AWS Region you want to use>
           - name: Additional steps
             run: |
               # Your commands that require AWS credentials
-              aws sts get-caller-identity 
+              aws sts get-caller-identity
     ```
-    </details>
-That's it! Your GitHub Actions workflow can now access AWS resources using the
-IAM Role you created. Other authentication scenarios are also supported (see
-below).
 
-Security Recommendations
-------------------------
-* Use temporary credentials when possible. OIDC is recommended because it
+    </details>
+
+  That's it! Your GitHub Actions workflow can now access AWS resources using
+    the IAM Role you created. Other authentication scenarios are also supported
+    (see below).
+
+## Security Recommendations
+
+- Use temporary credentials when possible. OIDC is recommended because it
   provides temporary credentials and it's easy to set up.
-* Do not store credentials in your repository's code. Consider using
+- Do not store credentials in your repository's code. Consider using
   [git-secrets](https://github.com/awslabs/git-secrets) to prevent committing
   secrets to your repository.
-* [Grant least privilege](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege)
+- [Grant least privilege](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege)
   to your workflows. Grant only those permissions that are necessary for the
   workflow to run.
-* [Monitor the activity](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#keep-a-log)
+- [Monitor the activity](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#keep-a-log)
   of the credentials used in workflows.
-* Periodically rotate any long-lived credentials that you use.
-* Store sensitive information in a secure way, such as using
+- Periodically rotate any long-lived credentials that you use.
+- Store sensitive information in a secure way, such as using
   [AWS Secrets Manager](https://aws.amazon.com/secrets-manager/) or
-  [GitHub Secrets](https://docs.github.com/en/actions/security-guides/encrypted-secrets).
+  [GitHub Secrets][gh-secrets].
+- Be especially careful about running Actions in non-ephemeral environments, or
+  [triggering workflows on `pull_request_target`](https://docs.github.com/en/actions/reference/workflows-and-actions/events-that-trigger-workflows#pull_request_target)
+  events.
+
+[gh-secrets]:
+  https://docs.github.com/en/actions/security-guides/encrypted-secrets
+
+## Non-OIDC Authentication Options
 
-Other Authentication Scenarios
-------------------------------
 This action supports five different authentication methods that are configured
 by specifying different inputs.
 
@@ -94,82 +105,187 @@ by specifying different inputs.
 5. Use credentials stored in the Action environment to fetch temporary
    credentials via STS AssumeRole.
 
-Because we use the AWS JavaScript SDK, we always will use the [credential
-resolution flow for Node.js](https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/setting-credentials-node.html).
+Because we use the AWS JavaScript SDK, we always will use the
+[credential resolution flow for Node.js][cred-resolution].
+
+[cred-resolution]:
+  https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/setting-credentials-node.html
 Depending on your inputs, the action might override parts of this flow.
 
 <details>
 <summary>Inputs and their effects on the credential resolution flow</summary>
 
-| **Identity Used**                        | `aws-access-key-id` | `role-to-assume` | `web-identity-token-file` | `role-chaining` |
-| ---------------------------------------- | ------------------- | ---------------- | ------------------------- | --------------- |
-| [✅ Recommended] GitHub OIDC             |                     | ✔                |                           |                 |
-| IAM User (no AssumeRole)                 | ✔                   |                  |                           |                 |
-| AssumeRole using static IAM credentials  | ✔                   | ✔                |                           |                 |
-| AssumeWithWebIdentity use a token file   |                     | ✔                | ✔                         |                 |
-| AssumeRole using existing credentials    |                     | ✔                |                           | ✔               |
+| **Identity Used**                       | `aws-access-key-id` | `role-to-assume` | `web-identity-token-file` | `role-chaining` |
+| --------------------------------------- | ------------------- | ---------------- | ------------------------- | --------------- |
+| [✅ Recommended] GitHub OIDC            |                     | ✔                |                           |                 |
+| IAM User (no AssumeRole)                | ✔                   |                  |                           |                 |
+| AssumeRole using static IAM credentials | ✔                   | ✔                |                           |                 |
+| AssumeWithWebIdentity use a token file  |                     | ✔                | ✔                         |                 |
+| AssumeRole using existing credentials   |                     | ✔                |                           | ✔               |
+
+_Note: `role-chaining` is not always necessary to use existing credentials. If
+you're getting a "Credentials loaded by the SDK do not match" error, try
+enabling this option._
 
-*Note: `role-chaining` is not always necessary to use existing credentials.
-If you're getting a "Credentials loaded by the SDK do not match" error,
-try enabling this option.*
 </details>
 
 Additionally, **`aws-region`** is always required.
 
-*Note: If you use GitHub Enterprise Server, you must use the you may need to
-adjust examples here to match your environment.*
+_Note: If you use GitHub Enterprise Server, you may need to adjust examples
+here to match your environment._
+
+## Additional Options
 
-Additional Options
-------------------
 ### Options
-See [action.yml](./action.yml) for more detail.
+
+The options list can be expanded below. See [action.yml](./action.yml) for more
+detail.
+
 <details>
 <summary>Options list and descriptions</summary>
 
-|          Option           |                                            Description                                            | Required |
-|---------------------------|---------------------------------------------------------------------------------------------------|----------|
-| aws-region                | Which AWS region to use                                                                           |    Yes   |
-| role-to-assume            | Role for which to fetch credentials. Only required for some authentication types.                 |    No    |
-| aws-access-key-id         | AWS access key to use. Only required for some authentication types.                               |    No    |
-| aws-secret-access-key     | AWS secret key to use. Only required for some authentication types.                               |    No    |
-| aws-session-token         | AWS session token to use. Used in uncommon authentication scenarios.                              |    No    |
-| role-chaining             | Use existing credentials from the environment to assume a new role.                               |    No    |
-| audience                  | The JWT audience when using OIDC. Used in non-default AWS partitions, like China regions.         |    No    |
-| http-proxy                | An HTTP proxy to use for API calls.                                                               |    No    |
-| mask-aws-account-id       | AWS account IDs are not considered secret. Setting this will hide account IDs from output anyway. |    No    |
-| role-duration-seconds     | The assumed role duration in seconds, if assuming a role. Defaults to 1 hour (3600 seconds). Acceptable values range from 15 minutes (900 seconds) to 12 hours (43200 seconds). |    No    |
-| role-external-id          | The external ID of the role to assume. Only needed if your role requires it.                      |    No    |
-| role-session-name         | Defaults to "GitHubActions", but may be changed if required.                                      |    No    |
-| role-skip-session-tagging | Skips session tagging if set.                                                                     |    No    |
-| inline-session-policy     | You may further restrict the assumed role policy by defining an inline policy here.               |    No    |
-| managed-session-policies  | You may further restrict the assumed role policy by specifying a managed policy here.             |    No    |
-| output-credentials        | When set, outputs fetched credentials as action step output. (Outputs aws-access-key-id, aws-secret-access-key, aws-session-token, aws-account-id, authenticated-arn, and aws-expiration). Defaults to false.                   |    No    |
-| output-env-credentials       | When set, outputs fetched credentials as environment variables (AWS_REGION, AWS_DEFAULT_REGION, AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN). Defaults to true. Set to false if you need to avoid setting/changing env variables. You'd probably want to use output-credentials if you disable this. (NOTE: Setting to false will prevent the aws-account-id from being exported as a step output). |    No    |
-| unset-current-credentials | When set, attempts to unset any existing credentials in your action runner.                       |    No    |
-| disable-retry             | Disabled retry/backoff logic for assume role calls. By default, retries are enabled.              |    No    |
-| retry-max-attempts        | Limits the number of retry attempts before giving up. Defaults to 12.                             |    No    |
-| special-characters-workaround | Uncommonly, some environments cannot tolerate special characters in a secret key. This option will retry fetching credentials until the secret access key does not contain special characters. This option overrides disable-retry and retry-max-attempts. | No |
-| use-existing-credentials  | When set, the action will check if existing credentials are valid and exit if they are. Defaults to false. |    No    |
-| allowed-account-ids       | A comma-delimited list of expected AWS account IDs. The action will fail if we receive credentials for the wrong account. |    No    |
-| force-skip-oidc           | When set, the action will skip using GitHub OIDC provider even if the id-token permission is set. |    No    |
+| Option                        | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Required |
+| ----------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------- |
+| aws-region                    | Which AWS region to use                                                                                                                                                                                                                                                                                                                                                                                                                                          | Yes      |
+| aws-profile                   | Name of the AWS profile to configure. When provided, credentials are written to `~/.aws/credentials` and `~/.aws/config` files. This enables configuring multiple profiles in a single workflow. Name cannot contain whitespace, square brackets, or slashes. When set, credentials will not be exported as environment variables unless `output-env-credentials` is manually set to true.                                                                       | No       |
+| overwrite-aws-profile         | Overwrite the given AWS profile if it already exists. When set to false or not set, an error will be thrown if the profile already exists.                                                                                                                                                                                                                                                                                                                       | No       |
+| role-to-assume                | Role for which to fetch credentials. Only required for some authentication types.                                                                                                                                                                                                                                                                                                                                                                                | No       |
+| aws-access-key-id             | AWS access key to use. Only required for some authentication types.                                                                                                                                                                                                                                                                                                                                                                                              | No       |
+| aws-secret-access-key         | AWS secret key to use. Only required for some authentication types.                                                                                                                                                                                                                                                                                                                                                                                              | No       |
+| aws-session-token             | AWS session token to use. Used in uncommon authentication scenarios.                                                                                                                                                                                                                                                                                                                                                                                             | No       |
+| role-chaining                 | Use existing credentials from the environment to assume a new role.                                                                                                                                                                                                                                                                                                                                                                                              | No       |
+| audience                      | The JWT audience when using OIDC. Used in non-default AWS partitions, like China regions.                                                                                                                                                                                                                                                                                                                                                                        | No       |
+| http-proxy                    | An HTTP proxy to use for API calls.                                                                                                                                                                                                                                                                                                                                                                                                                              | No       |
+| mask-aws-account-id           | AWS account IDs are not considered secret. Setting this will hide account IDs from output anyway.                                                                                                                                                                                                                                                                                                                                                                | No       |
+| role-duration-seconds         | The assumed role duration in seconds, if assuming a role. Defaults to 1 hour (3600 seconds). Acceptable values range from 15 minutes (900 seconds) to 12 hours (43200 seconds).                                                                                                                                                                                                                                                                                  | No       |
+| role-external-id              | The external ID of the role to assume. Only needed if your role requires it.                                                                                                                                                                                                                                                                                                                                                                                     | No       |
+| role-session-name             | Defaults to "GitHubActions", but may be changed if required.                                                                                                                                                                                                                                                                                                                                                                                                     | No       |
+| role-skip-session-tagging     | Skips session tagging if set.                                                                                                                                                                                                                                                                                                                                                                                                                                    | No       |
+| transitive-tag-keys           | Define a list of transitive tag keys to pass when assuming a role.                                                                                                                                                                                                                                                                                                                                                                                               | No       |
+| inline-session-policy         | You may further restrict the assumed role policy by defining an inline policy here.                                                                                                                                                                                                                                                                                                                                                                              | No       |
+| managed-session-policies      | You may further restrict the assumed role policy by specifying a managed policy here.                                                                                                                                                                                                                                                                                                                                                                            | No       |
+| output-credentials            | When set, outputs fetched credentials as action step output. (Outputs aws-access-key-id, aws-secret-access-key, aws-session-token, aws-account-id, authenticated-arn, and aws-expiration). Defaults to false.                                                                                                                                                                                                                                                    | No       |
+| output-env-credentials        | When set, outputs fetched credentials as environment variables (AWS_REGION, AWS_DEFAULT_REGION, AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN, and AWS_PROFILE (if profile option is used)). Defaults to true when `aws-profile` is not set, and false when `aws-profile` is set. Set to false to avoid setting env variables. (NOTE: Setting to false will prevent aws-account-id from being exported as a step output).                          | No       |
+| unset-current-credentials     | When set, attempts to unset any existing credentials in your action runner.                                                                                                                                                                                                                                                                                                                                                                                      | No       |
+| disable-retry                 | Disabled retry/backoff logic for assume role calls. By default, retries are enabled.                                                                                                                                                                                                                                                                                                                                                                             | No       |
+| retry-max-attempts            | Limits the number of retry attempts before giving up. Defaults to 12.                                                                                                                                                                                                                                                                                                                                                                                            | No       |
+| special-characters-workaround | Uncommonly, some environments cannot tolerate special characters in a secret key. This option will retry fetching credentials until the secret access key does not contain special characters. This option overrides disable-retry and retry-max-attempts.                                                                                                                                                                                                       | No       |
+| use-existing-credentials      | When set, the action will check if existing credentials are valid and exit if they are. Defaults to false.                                                                                                                                                                                                                                                                                                                                                       | No       |
+| allowed-account-ids           | A comma-delimited list of expected AWS account IDs. The action will fail if we receive credentials for the wrong account.                                                                                                                                                                                                                                                                                                                                        | No       |
+| force-skip-oidc               | When set, the action will skip using GitHub OIDC provider even if the id-token permission is set.                                                                                                                                                                                                                                                                                                                                                                | No       |
+| action-timeout-s              | Global timeout for the action in seconds. If set to a value greater than 0, the action will fail if it takes longer than this time to complete.                                                                                                                                                                                                                                                                                                                  | No       |
+
 </details>
 
 #### Adjust the retry mechanism
-You can configure retry settings for if the STS call fails. By default, we
-retry with exponential backoff `12` times. You can disable this behavior
-altogether by setting the `disable-retry` input to `true`, or you can configure
-the number of times it retries with the `retry-max-attempts` input.
+
+You can configure retry settings for if the STS call fails. By default, we retry
+with exponential backoff `12` times. You can disable this behavior altogether by
+setting the `disable-retry` input to `true`, or you can configure the number of
+times it retries with the `retry-max-attempts` input.
 
 #### Mask account ID
+
 Your account ID is not masked by default in workflow logs. You can set the
 `mask-aws-account-id` input to `true` to mask your account ID in workflow logs
 if desired.
 
 #### Unset current credentials
+
 Sometimes, existing credentials in your runner can get in the way of the
 intended outcome. You can set the `unset-current-credentials` input to `true` to
 work around this issue.
 
+#### Configure named AWS profiles
+
+By default, this action exports credentials as environment variables
+(AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, etc.). However, you can use the
+`aws-profile` input to configure named AWS profiles. When `aws-profile` is
+provided, credentials are written to `~/.aws/credentials` and `~/.aws/config`
+files (which are created if they don't already exist). The default locations of
+these files will be overridden if the `AWS_SHARED_CREDENTIALS_FILE` and
+`AWS_CONFIG_FILE` environment variables are present.
+
+Profile names may not contain whitespace, square brackets, or forward or
+backslashes.
+
+Writing to a profile will prevent credentials being written to the environment
+by default. Use `output-env-credentials: true` if you would like the
+credentials to also be exported as environment variables.
+
+By default, the action will not overwrite existing profiles. If you would like
+to overwrite a profile, set the `overwrite-aws-profile` input to `true`.
+
+_Note: When writing profiles, the action will preserve existing profile sections
+in the credentials and config files. However, comments in these files will not
+be preserved._
+
+_Caution: Writing to the AWS configuration file means that credentials will
+persist in the execution environment even after the action cleanup step. Use
+extreme care to ensure that this is safe in your environment and you do not leak
+valid credentials unintentionally. Writing to configuration files is intended
+for unusual authentication scenarios._
+
+For using profiles with static IAM User Credentials or when using one
+role to assume another, role chaining is needed:
+
+<details>
+
+If using static credentials, it's necessary to set `role-chaining: true` and
+specify the profile name as an environment variable in the job step:
+
+```yaml
+- name: Configure AWS Credentials
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with: 
+    aws-region: us-east-1
+    role-to-assume: arn:aws:iam::123456789100:role/my-role
+    aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
+    aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+    aws-profile: MyProfile1
+    role-chaining: true
+  env:
+    AWS_PROFILE: MyProfile1
+```
+
+If you are using one role to assume another while using profiles, the
+subsequent steps must set `role-chaining: true` and specify the prior profile's
+name as step environment variables:
+
+```yaml
+- name: Configure AWS credentials
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-region: us-east-1
+    role-to-assume: arn:aws:iam::123456789100:role/my-first-role
+    aws-profile: firstRoleInChain
+
+- name: assume second role
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-region: us-east-2
+    role-to-assume: arn:aws:iam::987654321000:role/my-second-role
+    role-chaining: true
+    aws-profile: secondRoleInChain
+  env:
+    AWS_PROFILE: firstRoleInChain
+```
+
+</details>
+
+See the [Examples](#examples) section for more usage examples.
+
+#### Skip the cleanup
+
+By default, this action runs a post-job cleanup step that removes credentials
+from the environment. To skip this step, set the `AWS_SKIP_CLEANUP_STEP`
+environment variable to `true`:
+
+```yaml
+    env:
+      AWS_SKIP_CLEANUP_STEP: 'true'
+```
+
 #### Use an HTTP proxy
 
 If need use an HTTP proxy you can set it in the action manually. Additionally
@@ -179,8 +295,9 @@ this action will always consider the `HTTP_PROXY` environment variable.
 <summary>Proxy configuration</summary>
 
 Manually configured proxy:
+
 ```yaml
-uses: aws-actions/configure-aws-credentials@v4.3.1
+uses: aws-actions/configure-aws-credentials@v6.1.0
 with:
   aws-region: us-east-2
   role-to-assume: my-github-actions-role
@@ -188,16 +305,22 @@ with:
 ```
 
 Proxy configured in the environment variable:
+
 ```bash
 # Your environment configuration
 HTTP_PROXY="http://companydomain.com:3128"
 ```
+
 </details>
 
 #### Special characters in AWS_SECRET_ACCESS_KEY
+
 Some edge cases are unable to properly parse an `AWS_SECRET_ACCESS_KEY` if it
 contains special characters. For more information, please see the
-[AWS CLI documentation](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-troubleshooting.html#tshoot-signature-does-not-match).
+[AWS CLI documentation][aws-cli-troubleshooting].
+
+[aws-cli-troubleshooting]:
+  https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-troubleshooting.html#tshoot-signature-does-not-match
 If you set the `special-characters-workaround` option, this action will
 continually retry fetching credentials until we get one that does not have
 special characters. This option overrides the `disable-retry` and
@@ -205,18 +328,21 @@ special characters. This option overrides the `disable-retry` and
 unless required, because retrying APIs infinitely until they succeed is not best
 practice.
 
-Session Naming and Policies
----------------------------
+## Session Naming and Policies
+
 The default session name is "GitHubActions", and you can modify it by specifying
 the desired name in `role-session-name`.
 
-*Note: you might find it helpful to set the `role-session-name` to `${{ github.run_id }}` 
-so as to clarify in audit logs which AWS actions were performed by which workflow 
-run.*
+_Note: you might find it helpful to set the `role-session-name` to
+`${{ github.run_id }}` so as to clarify in audit logs which AWS actions were
+performed by which workflow run._
 
-The session will be tagged with the
-following tags: (Refer to [GitHub's documentation for `GITHUB_` environment
-variable definitions](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/using-environment-variables#default-environment-variables))
+The session will be tagged with the following tags: (Refer to
+[GitHub's documentation for `GITHUB_` environment variable
+definitions][gh-env-vars])
+
+[gh-env-vars]:
+  https://docs.github.com/en/actions/reference/workflows-and-actions/variables#default-environment-variables
 
 | Key        | Value             |
 | ---------- | ----------------- |
@@ -232,17 +358,39 @@ _Note: all tag values must conform to
 [the tag requirements](https://docs.aws.amazon.com/STS/latest/APIReference/API_Tag.html).
 Particularly, `GITHUB_WORKFLOW` will be truncated if it's too long. If
 `GITHUB_ACTOR` or `GITHUB_WORKFLOW` contain invalid characters, the characters
-will be replaced with an '*'._
+will be replaced with an '\*'._
 
 The action will use session tagging by default unless you are using OIDC.
 
+To [forward session tags to subsequent sessions in a role
+chain][session-tag-chaining], you can use
+
+[session-tag-chaining]: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_session-tags.html#id_session-tags_role-chaining
+
+the `transitive-tag-keys` input to specify the keys of the tags to be passed.
+
+_Note that all subsequent roles in the chain must have
+`role-skip-session-tagging` set to `true`_
+
+```yaml
+uses: aws-actions/configure-aws-credentials@v6
+with:
+  transitive-tag-keys: |
+    Repository
+    Workflow
+    Action
+    Actor
+```
+
 ### Session policies
+
 Session policies are not required, but they allow you to limit the scope of the
 fetched credentials without making changes to IAM roles. You can specify inline
 session policies right in your workflow file, or refer to an existing managed
 session policy by its ARN.
 
 #### Inline session policies
+
 An IAM policy in stringified JSON format that you want to use as an inline
 session policy. Depending on preferences, the JSON could be written on a single
 line.
@@ -251,30 +399,34 @@ line.
 <summary>Inline session policy examples</summary>
 
 ```yaml
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-         inline-session-policy: '{"Version":"2012-10-17","Statement":[{"Sid":"Stmt1","Effect":"Allow","Action":"s3:List*","Resource":"*"}]}'
+uses: aws-actions/configure-aws-credentials@v6.1.0
+with:
+  inline-session-policy: '{"Version":"2012-10-17","Statement":[{"Sid":"Stmt1","Effect":"Allow","Action":"s3:List*","Resource":"*"}]}'
 ```
+
 Or we can have a nicely formatted JSON as well:
+
 ```yaml
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-         inline-session-policy: >-
-          {
-           "Version": "2012-10-17",
-           "Statement": [
-            {
-             "Sid":"Stmt1",
-             "Effect":"Allow",
-             "Action":"s3:List*",
-             "Resource":"*"
-            }
-           ]
-          }
+uses: aws-actions/configure-aws-credentials@v6.1.0
+with:
+  inline-session-policy: >-
+    {
+     "Version": "2012-10-17",
+     "Statement": [
+      {
+       "Sid":"Stmt1",
+       "Effect":"Allow",
+       "Action":"s3:List*",
+       "Resource":"*"
+      }
+     ]
+    }
 ```
+
 </details>
 
 #### Managed session policies
+
 The Amazon Resource Names (ARNs) of the IAM managed policies that you want to
 use as managed session policies. The policies must exist in the same account as
 the role.
@@ -283,36 +435,40 @@ the role.
 <summary>Managed session policy examples</summary>
 
 ```yaml
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-         managed-session-policies: arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess
+uses: aws-actions/configure-aws-credentials@v6.1.0
+with:
+  managed-session-policies: arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess
 ```
+
 And we can pass multiple managed policies likes this:
+
 ```yaml
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-         managed-session-policies: |
-          arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess
-          arn:aws:iam::aws:policy/AmazonS3OutpostsReadOnlyAccess
+uses: aws-actions/configure-aws-credentials@v6.1.0
+with:
+  managed-session-policies: |
+    arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess
+    arn:aws:iam::aws:policy/AmazonS3OutpostsReadOnlyAccess
 ```
+
 </details>
 
-OIDC Configuration
--------------------
-We recommend using [GitHub's OIDC
-provider](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/configuring-openid-connect-in-amazon-web-services)
+## OIDC Configuration Details
+
+We recommend using
+[GitHub's OIDC provider](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/configuring-openid-connect-in-amazon-web-services)
 to get short-lived AWS credentials needed for your actions. When using OIDC, you
-configure IAM to accept JWTs from GitHub's OIDC endpoint. This action will
-then create a JWT unique to the workflow run using the OIDC endpoint, and it
-will use the JWT to assume the specified role with short-term credentials. 
+configure IAM to accept JWTs from GitHub's OIDC endpoint. This action will then
+create a JWT unique to the workflow run using the OIDC endpoint, and it will use
+the JWT to assume the specified role with short-term credentials.
 
 To get this to work
+
 1. Configure your workflow to use the `id-token: write` permission.
 2. Configure your audience, if required.
 3. In your AWS account, configure IAM to trust GitHub's OIDC identity provider.
 4. Configure an IAM role with appropriate claim limits and permission scope.
 
-   *Note*: Naming your role "GitHubActions" has been reported to not work. See
+   _Note_: Naming your role "GitHubActions" has been reported to not work. See
    [#953](https://github.com/aws-actions/configure-aws-credentials/issues/953).
 
 5. Specify that role's ARN when setting up this action.
@@ -321,31 +477,33 @@ To get this to work
 
 When the JWT is created, an audience needs to be specified. Normally, you would
 use `sts.amazonaws.com`, and this action uses this by default if you don't
-specify one. This will work for most cases. Changing the default audience may
-be necessary when using non-default AWS partitions, such as China regions.
-You can specify the audience through the `audience` input:
+specify one. This will work for most cases. Changing the default audience may be
+necessary when using non-default AWS partitions, such as China regions. You can
+specify the audience through the `audience` input:
 
 ```yaml
-    - name: Configure AWS Credentials for China region audience
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-        audience: sts.amazonaws.com.cn
-        aws-region: cn-northwest-1
-        role-to-assume: arn:aws-cn:iam::123456789100:role/my-github-actions-role
+- name: Configure AWS Credentials for China region audience
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    audience: sts.amazonaws.com.cn
+    aws-region: cn-northwest-1
+    role-to-assume: arn:aws-cn:iam::123456789100:role/my-github-actions-role
 ```
 
 ### Configuring IAM to trust GitHub
+
 To use GitHub's OIDC provider, you must first set up federation in your AWS
 account. This involves creating an IAM Identity Provider that trusts GitHub's
-OIDC endpoint. You can create an IAM Identity Provider in the AWS Management 
+OIDC endpoint. You can create an IAM Identity Provider in the AWS Management
 Console by specifying the following details:
+
 - **Provider Type**: OIDC
 - **Provider URL**: `https://token.actions.githubusercontent.com`
 - **Audience**: `sts.amazonaws.com` (or your custom audience if you specified
   one in the `audience` input)
 
 Prior versions of this documentation gave instructions for specifying the
-certificate fingerprint, but this is no longer necessary. The thumbprint, if 
+certificate fingerprint, but this is no longer necessary. The thumbprint, if
 specified, will be ignored.
 
 You can also create the IAM Identity Provider using the AWS CLI:
@@ -353,27 +511,32 @@ You can also create the IAM Identity Provider using the AWS CLI:
 ```bash
 aws iam create-open-id-connect-provider \
     --url https://token.actions.githubusercontent.com \
-    --client-id-list sts.amazonaws.com 
+    --client-id-list sts.amazonaws.com
 ```
 
 ### Claims and scoping permissions
-To align with the Amazon IAM best practice of [granting least
-privilege](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege),
+
+To align with the Amazon IAM best practice of
+[granting least privilege][least-privilege],
+
+[least-privilege]:
+  https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege
 the assume role policy document should contain a
 [`Condition`](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition.html)
-that specifies a subject (`sub`) allowed to assume the role. [GitHub also
-recommends](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect#defining-trust-conditions-on-cloud-roles-using-oidc-claims)
-filtering for the correct audience (`aud`). See [AWS IAM
-documentation](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_iam-condition-keys.html#condition-keys-wif)
+that specifies a subject (`sub`) allowed to assume the role.
+[GitHub also recommends](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect#defining-trust-conditions-on-cloud-roles-using-oidc-claims)
+filtering for the correct audience (`aud`). See
+[AWS IAM documentation](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_iam-condition-keys.html#condition-keys-wif)
 on which claims you can filter for in your trust policies.
 
 Without a subject (`sub`) condition, any GitHub user or repository could
 potentially assume the role. The subject can be scoped to a GitHub organization
 and repository as shown in the CloudFormation template. However, scoping it down
 to your org and repo may cause the role assumption to fail in some cases. See
-[Example subject claims](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect#example-subject-claims)
+[Example subject claims](https://docs.github.com/en/actions/reference/security/oidc#example-subject-claims)
 for specific details on what the subject value will be depending on your
-workflow. You can also [customize your subject claim](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect#customizing-the-token-claims)
+workflow. You can also
+[customize your subject claim](https://docs.github.com/en/actions/reference/security/oidc#customizing-the-token-claims)
 if you want full control over the information you can filter for in your trust
 policy. If you aren't sure what your subject (`sub`) key is, you can add the
 [`actions-oidc-debugger`](https://github.com/github/actions-oidc-debugger)
@@ -381,7 +544,11 @@ action to your workflow to see the value of the subject (`sub`) key, as well as
 other claims.
 
 Additional claim conditions can be added for higher specificity as explained in
-the [GitHub documentation](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect).
+the
+[GitHub documentation][gh-oidc-hardening].
+
+[gh-oidc-hardening]:
+  https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect
 Due to implementation details, not every OIDC claim is presently supported by
 IAM.
 
@@ -389,111 +556,165 @@ IAM.
 
 For further information on OIDC and GitHub Actions, please see:
 
-* [AWS docs: Creating OpenID Connect (OIDC) identity providers](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_providers_create_oidc.html)
-* [AWS docs: IAM JSON policy elements: Condition](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition.html)
-* [GitHub docs: About security hardening with OpenID Connect](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect)
-* [GitHub docs: Configuring OpenID Connect in Amazon Web Services](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/configuring-openid-connect-in-amazon-web-services)
-* [GitHub changelog: GitHub Actions: Secure cloud deployments with OpenID Connect](https://github.blog/changelog/2021-10-27-github-actions-secure-cloud-deployments-with-openid-connect/)
+- [AWS docs: Creating OpenID Connect (OIDC) identity providers](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_providers_create_oidc.html)
+- [AWS docs: IAM JSON policy elements: Condition](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition.html)
+- [GitHub docs: About security hardening with OpenID Connect](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect)
+- [GitHub docs: Configuring OpenID Connect in Amazon Web Services](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/configuring-openid-connect-in-amazon-web-services)
+- [GitHub changelog: GitHub Actions: Secure cloud deployments with OpenID Connect](https://github.blog/changelog/2021-10-27-github-actions-secure-cloud-deployments-with-openid-connect/)
 
-Examples
---------
+## Examples
 
 ### AssumeRoleWithWebIdentity
+
 ```yaml
-    - name: Configure AWS Credentials
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-        aws-region: us-east-2
-        role-to-assume: arn:aws:iam::123456789100:role/my-github-actions-role
-        role-session-name: MySessionName
+- name: Configure AWS Credentials
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-region: us-east-2
+    role-to-assume: arn:aws:iam::123456789100:role/my-github-actions-role
+    role-session-name: MySessionName
 ```
+
 In this example, the Action will load the OIDC token from the GitHub-provided
 environment variable and use it to assume the role
 `arn:aws:iam::123456789100:role/my-github-actions-role` with the session name
 `MySessionName`.
 
 ### AssumeRole with role previously assumed by action in same workflow
+
 ```yaml
-    - name: Configure AWS Credentials
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-        aws-region: us-east-2
-        role-to-assume: arn:aws:iam::123456789100:role/my-github-actions-role
-        role-session-name: MySessionName
-    - name: Configure other AWS Credentials
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-        aws-region: us-east-2
-        role-to-assume: arn:aws:iam::987654321000:role/my-second-role
-        role-session-name: MySessionName
-        role-chaining: true
+- name: Configure AWS Credentials
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-region: us-east-2
+    role-to-assume: arn:aws:iam::123456789100:role/my-github-actions-role
+    role-session-name: MySessionName
+- name: Configure other AWS Credentials
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-region: us-east-2
+    role-to-assume: arn:aws:iam::987654321000:role/my-second-role
+    role-session-name: MySessionName
+    role-chaining: true
 ```
+
 In this two-step example, the first step will use OIDC to assume the role
 `arn:aws:iam::123456789100:role/my-github-actions-role` just as in the prior
 example. Following that, a second step will use this role to assume a different
 role, `arn:aws:iam::987654321000:role/my-second-role`.
 
-### AssumeRole with static IAM credentials in repository secrets
-```yaml
-    - name: Configure AWS Credentials
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-        aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
-        aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
-        aws-region: us-east-2
-        role-to-assume: ${{ secrets.AWS_ROLE_TO_ASSUME }}
-        role-external-id: ${{ secrets.AWS_ROLE_EXTERNAL_ID }}
-        role-duration-seconds: 1200
-        role-session-name: MySessionName
-```
-In this example, the secret `AWS_ROLE_TO_ASSUME` contains a string like
-`arn:aws:iam::123456789100:role/my-github-actions-role`.  To assume a role in
-the same account as the static credentials, you can simply specify the role
-name, like `role-to-assume: my-github-actions-role`.
+Note that the trust relationship/trust policy of the second role must grant the
+permissions `sts:AssumeRole` and `sts:TagSession` to the first role. (Or,
+alternatively, the `TagSession` permission can be omitted if you are using the
+`role-skip-session-tagging: true` flag for the second step.)
+
+### AssumeRole with static IAM credentials in repository secrets
 
-### Retrieving credentials from step output, AssumeRole with temporary credentials
 ```yaml
-    - name: Configure AWS Credentials 1
-      id: creds
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-        aws-region: us-east-2
-        role-to-assume: arn:aws:iam::123456789100:role/my-github-actions-role
-        output-credentials: true
-    - name: get caller identity 1
-      run: |
-        aws sts get-caller-identity
-    - name: Configure AWS Credentials 2
-      uses: aws-actions/configure-aws-credentials@v4.3.1
-      with:
-        aws-region: us-east-2
-        aws-access-key-id: ${{ steps.creds.outputs.aws-access-key-id }}
-        aws-secret-access-key: ${{ steps.creds.outputs.aws-secret-access-key }}
-        aws-session-token: ${{ steps.creds.outputs.aws-session-token }}
-        role-to-assume: arn:aws:iam::123456789100:role/my-other-github-actions-role
-    - name: get caller identity2
-      run: |
-        aws sts get-caller-identity
+- name: Configure AWS Credentials
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
+    aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+    aws-region: us-east-2
+    role-to-assume: ${{ secrets.AWS_ROLE_TO_ASSUME }}
+    role-external-id: ${{ secrets.AWS_ROLE_EXTERNAL_ID }}
+    role-duration-seconds: 1200
+    role-session-name: MySessionName
 ```
+
+In this example, the secret `AWS_ROLE_TO_ASSUME` contains a string like
+`arn:aws:iam::123456789100:role/my-github-actions-role`. To assume a role in the
+same account as the static credentials, you can simply specify the role name,
+like `role-to-assume: my-github-actions-role`.
+
+### Retrieving credentials from step output
+
+```yaml
+- name: Configure AWS Credentials 1
+  id: creds
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-region: us-east-2
+    role-to-assume: arn:aws:iam::123456789100:role/my-github-actions-role
+    output-credentials: true
+- name: get caller identity 1
+  run: |
+    aws sts get-caller-identity
+- name: Configure AWS Credentials 2
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-region: us-east-2
+    aws-access-key-id: ${{ steps.creds.outputs.aws-access-key-id }}
+    aws-secret-access-key: ${{ steps.creds.outputs.aws-secret-access-key }}
+    aws-session-token: ${{ steps.creds.outputs.aws-session-token }}
+    role-to-assume: arn:aws:iam::123456789100:role/my-other-github-actions-role
+- name: get caller identity2
+  run: |
+    aws sts get-caller-identity
+```
+
 This example shows that you can reference the fetched credentials as outputs if
 `output-credentials` is set to true. This example also shows that you can use
 the `aws-session-token` input in a situation where session tokens are fetched
 and passed to this action.
 
-Versioning
-----------
-Starting with version 5.0.0, this action uses semantic-style release tags and
-[immutable releases](https://docs.github.com/en/code-security/supply-chain-security/understanding-your-software-supply-chain/immutable-releases).
-A floating version tag (vN) is also provided for convenience: this tag will
-move to the latest major version (vN -> vN.2.1, vM -> vM.0.0, etc.).
+### Configure multiple AWS profiles in a single workflow
+
+```yaml
+- name: Configure AWS Credentials for Dev
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-region: us-east-1
+    role-to-assume: arn:aws:iam::111111111111:role/dev-role
+    aws-profile: dev
+
+- name: Configure AWS Credentials for Prod
+  uses: aws-actions/configure-aws-credentials@v6.1.0
+  with:
+    aws-region: us-west-2
+    role-to-assume: arn:aws:iam::222222222222:role/prod-role
+    aws-profile: prod
+
+- name: Use multiple profiles
+  run: |
+    # Check caller identity for dev account
+    aws sts get-caller-identity --profile dev
+
+    # Check caller identity for prod account
+    aws sts get-caller-identity --profile prod
+
+    # Deploy to dev using CDK
+    cdk deploy --profile dev
+```
+
+This example shows how to configure multiple named AWS profiles in a single
+workflow. When using the `aws-profile` input, credentials are written to
+`~/.aws/credentials` and `~/.aws/config` files, allowing you to reference
+different profiles using the `--profile` flag with AWS CLI, SDKs, CDK, and
+other tools.
+
+Each profile is independent and can authenticate to different AWS accounts or
+use different roles. This is particularly useful for multi-account deployments
+or when you need to interact with multiple AWS environments in a single job.
+
+## Versioning
+
+Starting with version 5.0.0, this action uses semantic-style release tags and
+[immutable releases][immutable-releases].
+
+[immutable-releases]:
+  https://docs.github.com/en/code-security/supply-chain-security/understanding-your-software-supply-chain/immutable-releases
+A floating version tag (vN) is also provided for convenience: this tag will move
+to the latest major version (vN -> vN.2.1, vM -> vM.0.0, etc.).
+
+## License
 
-License
--------
 This code is made available under the MIT license.
 
-Security Disclosures
---------------------
+## Security Disclosures
+
 If you would like to report a potential security issue in this project, please
 do not create a GitHub issue. Instead, please follow the instructions
-[here](https://aws.amazon.com/security/vulnerability-reporting/) or
-[email AWS security](mailto:aws-security@amazon.com) directly.
+[on the vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting/)
+or [email AWS security](mailto:aws-security@amazon.com) directly.

action.yml

@@ -2,9 +2,10 @@
 name: '"Configure AWS Credentials" Action for GitHub Actions'
 description: Configures AWS credentials for use in subsequent steps in a GitHub Action workflow
 runs:
-  using: node20
+  using: node24
   main: dist/index.js
   post: dist/cleanup/index.js
+  post-if: env.AWS_SKIP_CLEANUP_STEP != 'true'
 branding:
   color: orange
   icon: cloud
@@ -12,6 +13,12 @@ inputs:
   aws-region:
     description: AWS Region, e.g. us-east-2
     required: true
+  aws-profile:
+    description: Name of the AWS profile to configure. When provided, credentials are written to ~/.aws/credentials and ~/.aws/config files instead of env variables (unless output-env-credentials is manually set to true). Name cannot contain whitespace, square brackets, or slashes.
+    required: false
+  overwrite-aws-profile:
+    description: Overwrite the given AWS profile if it already exists. Requires aws-profile. When set to false or not set, an error will be thrown if the profile already exists.
+    required: false
   role-to-assume:
     description: The Amazon Resource Name (ARN) of the role to assume. Use the provided credentials to assume an IAM role and configure the Actions environment with the assumed role credentials rather than with the provided credentials.
     required: false
@@ -37,6 +44,9 @@ inputs:
   http-proxy:
     description: Proxy to use for the AWS SDK agent
     required: false
+  no-proxy:
+    description: Hosts to skip for the proxy configuration
+    required: false
   mask-aws-account-id:
     description: Whether to mask the AWS account ID for these credentials as a secret value. By default the account ID will not be masked
     required: false
@@ -52,6 +62,9 @@ inputs:
   role-skip-session-tagging:
     description: Skip session tagging during role assumption
     required: false
+  transitive-tag-keys:
+    description: Define a list of transitive tag keys to pass when assuming a role
+    required: false
   inline-session-policy:
     description: Define an inline session policy to use when assuming a role
     required: false
@@ -64,7 +77,6 @@ inputs:
   output-env-credentials:
     description: Whether to export credentials as environment variables. If you set this to false, you probably want to use output-credentials.
     required: false
-    default: true
   unset-current-credentials:
     description: Whether to unset the existing credentials in your runner. May be useful if you run this action multiple times in the same job
     required: false
@@ -86,6 +98,9 @@ inputs:
   force-skip-oidc:
     required: false
     description: When enabled, this option will skip using GitHub OIDC provider even if the id-token permission is set. This is sometimes useful when using IAM instance credentials.
+  action-timeout-s:
+    required: false
+    description: A global timeout in seconds for the action. When the timeout is reached, the action immediately exits. The default is to run without a timeout.
 
 outputs:
   aws-account-id:

examples/README.md

@@ -2,8 +2,13 @@
 
 ## [federated-setup](./federated-setup/README.md)
 
-The directory contains templates for setting up the `configure-aws-credentials` federation between your GitHub Organization/repository and your AWS account.
+The directory contains templates for setting up the `configure-aws-credentials`
+federation between your GitHub Organization/repository and your AWS account.
 
 ## [cfn-deploy-example](./cfn-deploy-example/README.md)
 
-Repository example uses aws-action `configure-aws-credentials` with OIDC federation template [github-actions-oidc-federation-and-role](./github-actions-oidc-federation-and-role.yml). Example demonstrates a repository that deploys AWS CloudFormation template using cfn-deploy GitHub Action.
+Repository example uses aws-action `configure-aws-credentials` with OIDC
+federation template
+[github-actions-oidc-federation-and-role](./github-actions-oidc-federation-and-role.yml).
+Example demonstrates a repository that deploys AWS CloudFormation template using
+cfn-deploy GitHub Action.

examples/cfn-deploy-example/.github/workflows/compliance.yml

@@ -6,7 +6,7 @@ jobs:
   sast-guard:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: grolston/guard-action@main
       with:
         data_directory: './cloudformation/' ## change to your template directory

examples/cfn-deploy-example/.github/workflows/deploy.yml

@@ -18,9 +18,9 @@ jobs:
       contents: read
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
     - name: Configure AWS Credentials
-      uses: aws-actions/configure-aws-credentials@v4
+      uses: aws-actions/configure-aws-credentials@v6
       with:
         aws-region: us-east-1
         ## the following creates an ARN based on the values entered into github secrets

examples/cfn-deploy-example/README.md

@@ -1,14 +1,24 @@
 # cfn-deploy example
 
-Example uses aws-action `configure-aws-credentials` with OIDC federation. Prior to using this example project, the user needs to deploy the [github-actions-oidc-federation-and-role](../federated-setup/github-actions-oidc-federation-and-role.yml) template in the AWS account they want to deploy the CloudFormation template into. Specify the GitHub Organization name, repository name, and the specific branch you want to deploy on.
+Example uses aws-action `configure-aws-credentials` with OIDC federation. Prior
+to using this example project, the user needs to deploy the
+[github-actions-oidc-federation-and-role](../federated-setup/github-actions-oidc-federation-and-role.yml)
+template in the AWS account they want to deploy the CloudFormation template
+into. Specify the GitHub Organization name, repository name, and the specific
+branch you want to deploy on.
 
-Within the [github/workflows](./.github/workflows/) directory there is a [compliance.yml](./.github/workflows/compliance.yml) and a [deploy.yml](./.github/workflows/deploy.yml). The deploy.yml file leverages the aws-action `configure-aws-credentials` and accesses GitHub Action Secrets for some of the variables. The compliance.yml runs static application security testing using cfn-guard.
+Within the [github/workflows](./.github/workflows/) directory there is a
+[compliance.yml](./.github/workflows/compliance.yml) and a
+[deploy.yml](./.github/workflows/deploy.yml). The deploy.yml file leverages the
+aws-action `configure-aws-credentials` and accesses GitHub Action Secrets for
+some of the variables. The compliance.yml runs static application security
+testing using cfn-guard.
 
 To use the example you will need to set the following GitHub Action Secrets:
 
-| Secret Key | Used With | Description |
-| --------- | -------- | -----------|
-| AWS_ACCOUNT_ID | configure-aws-credentials | The AWS account ID |
-| AWS_DEPLOY_ROLE | configure-aws-credentials | The name of the IAM role |
-| VPC_ID | aws-cloudformation-github-deploy | VPC ID the EC2 Bastion is deployed to |
-| SUBNET_ID | aws-cloudformation-github-deploy | Subnet ID the EC2 Bastion is deployed to |
+| Secret Key      | Used With                        | Description                              |
+| --------------- | -------------------------------- | ---------------------------------------- |
+| AWS_ACCOUNT_ID  | configure-aws-credentials        | The AWS account ID                       |
+| AWS_DEPLOY_ROLE | configure-aws-credentials        | The name of the IAM role                 |
+| VPC_ID          | aws-cloudformation-github-deploy | VPC ID the EC2 Bastion is deployed to    |
+| SUBNET_ID       | aws-cloudformation-github-deploy | Subnet ID the EC2 Bastion is deployed to |

examples/federated-setup/README.md

@@ -2,8 +2,10 @@
 
 ## [github-action-oidc-federation](./github-actions-oidc-federation.yml)
 
-Setup of the OIDC federation between your GitHub Organization/repository and your AWS account.
+Setup of the OIDC federation between your GitHub Organization/repository and
+your AWS account.
 
 ## [github-actions-oidc-federation-and-role](./github-actions-oidc-federation-and-role.yml)
 
-Setup of the OIDC federation between your GitHub Organization/repository and your AWS account along with a role that only executes on specific branch.
+Setup of the OIDC federation between your GitHub Organization/repository and
+your AWS account along with a role that only executes on specific branch.

jest.config.cjs

@@ -1,31 +0,0 @@
-/** @type {import('jest').Config} */
-const config = {
-  verbose: true,
-  transform: {
-    '^.+\\.m?[tj]sx?$': ['ts-jest'],
-  },
-  testMatch: [
-    '<rootDir>/src/**/__tests__/**/*.ts?(x)',
-    '<rootDir>/(test|src)/**/*(*.)@(spec|test).ts?(x)',
-    '<rootDir>/test/**/*.(test|spec).(js|jsx|ts|tsx)',
-  ],
-  clearMocks: true,
-  collectCoverage: true,
-  coverageReporters: ['json', 'lcov', 'clover', 'cobertura', 'text'],
-  coverageDirectory: 'coverage',
-  coveragePathIgnorePatterns: ['/node_modules/'],
-  testPathIgnorePatterns: ['/node_modules/'],
-  watchPathIgnorePatterns: ['/node_modules/'],
-  reporters: [
-    'default',
-    [
-      'jest-junit',
-      {
-        outputDirectory: 'test-reports',
-      },
-    ],
-  ],
-  preset: 'ts-jest/presets/default-legacy',
-};
-
-module.exports = config;

package.json

@@ -1,14 +1,15 @@
 {
   "name": "configure-aws-credentials",
   "description": "A GitHub Action to configure AWS credentials",
-  "version": "5.0.0",
+  "version": "6.1.2",
   "scripts": {
     "build": "tsc",
-    "lint": "biome check --error-on-warnings ./src",
-    "lint:fix": "biome check --write ./src",
-    "package": "npm run build && ncc build --license THIRD-PARTY -o dist && ncc build src/cleanup/index.ts -o dist/cleanup && cpy dist/THIRD-PARTY . && del-cli dist/THIRD-PARTY",
+    "lint": "biome check --error-on-warnings ./src && markdownlint -i node_modules -i CHANGELOG.md '**/*.md'",
+    "lint:fix": "biome check --write ./src && markdownlint -i node_modules -i CHANGELOG.md -f '**/*.md'",
+    "package": "esbuild src/index.ts --bundle --platform=node --target=node24 --outfile=dist/index.js && esbuild src/cleanup/index.ts --bundle --platform=node --target=node24 --outfile=dist/cleanup/index.js && npm run license",
     "test": "npm run lint && vitest run && npm run build",
-    "clean": "del-cli coverage test-reports node_modules"
+    "clean": "del-cli coverage test-reports node_modules",
+    "license": "generate-license-file --config ./.generatelicensefile.json"
   },
   "author": {
     "name": "Amazon.com, Inc. or its affiliates",
@@ -16,26 +17,26 @@
     "organization": true
   },
   "devDependencies": {
-    "@aws-sdk/credential-provider-env": "^3.879.0",
-    "@biomejs/biome": "2.2.2",
-    "@smithy/property-provider": "^4.0.3",
-    "@types/node": "^24.3.0",
-    "@vercel/ncc": "^0.38.3",
-    "@vitest/coverage-v8": "^3.2.4",
+    "@aws-sdk/credential-provider-env": "^3.972.39",
+    "@biomejs/biome": "2.4.13",
+    "@smithy/property-provider": "^4.3.4",
+    "@types/node": "^25.9.1",
+    "@vitest/coverage-v8": "^4.1.6",
     "aws-sdk-client-mock": "^4.1.0",
-    "cpy-cli": "^6.0.0",
-    "del-cli": "^6.0.0",
+    "esbuild": "^0.28.0",
+    "generate-license-file": "^4.2.1",
     "json-schema": "^0.4.0",
-    "memfs": "^4.38.2",
+    "markdownlint-cli": "^0.48.0",
+    "memfs": "^4.57.2",
     "standard-version": "^9.5.0",
-    "typescript": "^5.8.3",
-    "vitest": "^3.2.4"
+    "typescript": "^6.0.3",
+    "vitest": "^4.1.6"
   },
   "dependencies": {
-    "@actions/core": "^1.11.1",
-    "@aws-sdk/client-sts": "^3.873.0",
-    "@smithy/node-http-handler": "^4.1.1",
-    "https-proxy-agent": "^7.0.6"
+    "@actions/core": "^2.0.2",
+    "@aws-sdk/client-sts": "^3.1053.0",
+    "@smithy/node-http-handler": "^4.6.1",
+    "proxy-agent": "^8.0.1"
   },
   "keywords": [
     "aws",
@@ -43,7 +44,7 @@
     "github-action"
   ],
   "engines": {
-    "node": ">= 14.0.0"
+    "node": ">= 16.3.0"
   },
   "main": "build/index.js",
   "license": "MIT",

release-please-config.json

@@ -10,6 +10,5 @@
       "exclude-paths": [".github", "dist"]
     }
   },
-  "last-release-sha": "7474bc4690e29a8392af63c5b98e7449536d5c3a",
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"
 }

src/CredentialsClient.ts

@@ -2,40 +2,58 @@ import { info } from '@actions/core';
 import { STSClient } from '@aws-sdk/client-sts';
 import type { AwsCredentialIdentity } from '@aws-sdk/types';
 import { NodeHttpHandler } from '@smithy/node-http-handler';
-import { HttpsProxyAgent } from 'https-proxy-agent';
+import { ProxyAgent } from 'proxy-agent';
 import { errorMessage, getCallerIdentity } from './helpers';
+import { ProxyResolver } from './ProxyResolver';
 
 const USER_AGENT = 'configure-aws-credentials-for-github-actions';
 
 export interface CredentialsClientProps {
   region?: string;
   proxyServer?: string;
+  noProxy?: string;
+  roleChaining: boolean;
 }
 
 export class CredentialsClient {
   public region?: string;
   private _stsClient?: STSClient;
   private readonly requestHandler?: NodeHttpHandler;
+  private roleChaining?: boolean;
 
   constructor(props: CredentialsClientProps) {
-    this.region = props.region;
+    if (props.region !== undefined) {
+      this.region = props.region;
+    }
     if (props.proxyServer) {
       info('Configuring proxy handler for STS client');
-      const handler = new HttpsProxyAgent(props.proxyServer);
+      const proxyOptions: { httpProxy: string; httpsProxy: string; noProxy?: string } = {
+        httpProxy: props.proxyServer,
+        httpsProxy: props.proxyServer,
+      };
+      if (props.noProxy !== undefined) {
+        proxyOptions.noProxy = props.noProxy;
+      }
+      const getProxyForUrl = new ProxyResolver(proxyOptions).getProxyForUrl;
+      const handler = new ProxyAgent({ getProxyForUrl });
       this.requestHandler = new NodeHttpHandler({
-        httpAgent: handler,
         httpsAgent: handler,
+        httpAgent: handler,
       });
     }
+    this.roleChaining = props.roleChaining;
   }
 
   public get stsClient(): STSClient {
-    if (!this._stsClient) {
-      this._stsClient = new STSClient({
-        region: this.region,
-        customUserAgent: USER_AGENT,
-        requestHandler: this.requestHandler ? this.requestHandler : undefined,
-      });
+    if (!this._stsClient || this.roleChaining) {
+      const config = { customUserAgent: USER_AGENT } as {
+        customUserAgent: string;
+        region?: string;
+        requestHandler?: NodeHttpHandler;
+      };
+      if (this.region !== undefined) config.region = this.region;
+      if (this.requestHandler !== undefined) config.requestHandler = this.requestHandler;
+      this._stsClient = new STSClient(config);
     }
     return this._stsClient;
   }
@@ -81,9 +99,9 @@ export class CredentialsClient {
   }
 
   private async loadCredentials() {
-    const client = new STSClient({
-      requestHandler: this.requestHandler ? this.requestHandler : undefined,
-    });
+    const config = {} as { requestHandler?: NodeHttpHandler };
+    if (this.requestHandler !== undefined) config.requestHandler = this.requestHandler;
+    const client = new STSClient(config);
     return client.config.credentials();
   }
 }

src/ProxyResolver.ts

@@ -0,0 +1,71 @@
+// Based on https://github.com/Rob--W/proxy-from-env/tree/caf8c32301afdac8b5feaf346028bd8240690144
+// See https://github.com/Rob--W/proxy-from-env/blob/caf8c32301afdac8b5feaf346028bd8240690144/LICENSE
+import type * as http from 'node:http';
+
+const DEFAULT_PORTS: Record<string, number> = {
+  http: 80,
+  https: 443,
+};
+export interface ProxyOptions {
+  readonly noProxy?: string;
+  readonly httpsProxy?: string;
+  readonly httpProxy?: string;
+}
+
+export class ProxyResolver {
+  options: ProxyOptions;
+  constructor(options: ProxyOptions) {
+    this.options = options;
+  }
+
+  // This method matches the interface expected by 'proxy-agent'. It is an arrow function to bind 'this'.
+  public readonly getProxyForUrl = (url: string, _req: http.ClientRequest): string => {
+    return this.getProxyForUrlOptions(url, this.options);
+  };
+
+  private getProxyForUrlOptions(url: string | URL, options?: ProxyOptions): string {
+    let parsedUrl: URL;
+    try {
+      parsedUrl = typeof url === 'string' ? new URL(url) : url;
+    } catch (_) {
+      return ''; // Don't proxy invalid URLs.
+    }
+    const proto = parsedUrl.protocol.split(':', 1)[0];
+    if (!proto) return ''; // Don't proxy URLs without a protocol.
+    const hostname = parsedUrl.host;
+    const port = parseInt(parsedUrl.port || '') || DEFAULT_PORTS[proto] || 0;
+
+    if (options?.noProxy && !this.shouldProxy(hostname, port, options.noProxy)) return '';
+    if (proto === 'http' && options?.httpProxy) return options.httpProxy;
+    if (proto === 'https' && options?.httpsProxy) return options.httpsProxy;
+    return ''; // No proxy configured for this protocol or unknown protocol
+  }
+
+  private shouldProxy(hostname: string, port: number, noProxy: string): boolean {
+    if (!noProxy) return true;
+    if (noProxy === '*') return false; // Never proxy if wildcard is set.
+
+    return noProxy.split(/[,\s]/).every((proxy) => {
+      if (!proxy) return true; // Skip zero-length hosts.
+
+      const parsedProxy = proxy.match(/^(.+):(\d+)$/);
+      const parsedProxyHostname = parsedProxy ? parsedProxy[1] : proxy;
+      const parsedProxyPort = parsedProxy?.[2] ? parseInt(parsedProxy[2]) : 0;
+
+      if (parsedProxyPort && parsedProxyPort !== port) return true; // Skip if ports don't match.
+
+      if (parsedProxyHostname && !/^[.*]/.test(parsedProxyHostname)) {
+        // No wildcards, so stop proxying if there is an exact match.
+        return hostname !== parsedProxyHostname;
+      }
+
+      let cleanProxyHostname = parsedProxyHostname;
+      if (parsedProxyHostname && parsedProxyHostname.charAt(0) === '*') {
+        // Remove leading wildcard.
+        cleanProxyHostname = parsedProxyHostname.slice(1);
+      }
+      // Stop proxying if the hostname ends with the no_proxy host.
+      return !cleanProxyHostname || !hostname.endsWith(cleanProxyHostname);
+    });
+  }
+}

src/assumeRole.ts

@@ -1,14 +1,14 @@
 import assert from 'node:assert';
-import fs from 'node:fs';
 import path from 'node:path';
 import * as core from '@actions/core';
 import type { AssumeRoleCommandInput, STSClient, Tag } from '@aws-sdk/client-sts';
 import { AssumeRoleCommand, AssumeRoleWithWebIdentityCommand } from '@aws-sdk/client-sts';
 import type { CredentialsClient } from './CredentialsClient';
-import { errorMessage, isDefined, sanitizeGitHubVariables } from './helpers';
+import { errorMessage, isDefined, readFileUtf8, sanitizeGitHubVariables } from './helpers';
 
 async function assumeRoleWithOIDC(params: AssumeRoleCommandInput, client: STSClient, webIdentityToken: string) {
   delete params.Tags;
+  delete params.TransitiveTagKeys;
   core.info('Assuming role with OIDC');
   try {
     const creds = await client.send(
@@ -35,12 +35,12 @@ async function assumeRoleWithWebIdentityTokenFile(
   const webIdentityTokenFilePath = path.isAbsolute(webIdentityTokenFile)
     ? webIdentityTokenFile
     : path.join(workspace, webIdentityTokenFile);
-  if (!fs.existsSync(webIdentityTokenFilePath)) {
+  const webIdentityToken = readFileUtf8(webIdentityTokenFilePath);
+  if (webIdentityToken === null) {
     throw new Error(`Web identity token file does not exist: ${webIdentityTokenFilePath}`);
   }
   core.info('Assuming role with web identity token file');
   try {
-    const webIdentityToken = fs.readFileSync(webIdentityTokenFilePath, 'utf8');
     delete params.Tags;
     const creds = await client.send(
       new AssumeRoleWithWebIdentityCommand({
@@ -70,6 +70,7 @@ export interface assumeRoleParams {
   roleDuration: number;
   roleSessionName: string;
   roleSkipSessionTagging?: boolean;
+  transitiveTagKeys?: string[];
   sourceAccountId?: string;
   roleExternalId?: string;
   webIdentityTokenFile?: string;
@@ -87,6 +88,7 @@ export async function assumeRole(params: assumeRoleParams) {
     roleDuration,
     roleSessionName,
     roleSkipSessionTagging,
+    transitiveTagKeys,
     webIdentityTokenFile,
     webIdentityToken,
     inlineSessionPolicy,
@@ -121,6 +123,11 @@ export async function assumeRole(params: assumeRoleParams) {
     core.debug(`${tags.length} role session tags are being used.`);
   }
 
+  //only populate transitiveTagKeys array if user is actually using session tagging
+  const transitiveTagKeysArray = roleSkipSessionTagging
+    ? undefined
+    : transitiveTagKeys?.filter((key) => tags?.some((tag) => tag.Key === key));
+
   // Calculate role ARN from name and account ID (currently only supports `aws` partition)
   let roleArn = roleToAssume;
   if (!roleArn.startsWith('arn:aws')) {
@@ -137,6 +144,7 @@ export async function assumeRole(params: assumeRoleParams) {
     RoleSessionName: roleSessionName,
     DurationSeconds: roleDuration,
     Tags: tags ? tags : undefined,
+    TransitiveTagKeys: transitiveTagKeysArray ? transitiveTagKeysArray : undefined,
     ExternalId: roleExternalId ? roleExternalId : undefined,
     Policy: inlineSessionPolicy ? inlineSessionPolicy : undefined,
     PolicyArns: managedSessionPolicies?.length ? managedSessionPolicies : undefined,

src/cleanup/index.ts

@@ -14,7 +14,8 @@ import { errorMessage, getBooleanInput } from '../helpers';
 
 export function cleanup() {
   // Only attempt to change environment variables if we changed them in the first place
-  if (getBooleanInput('output-env-credentials', { required: false, default: true })) {
+  const awsProfile = core.getInput('aws-profile', { required: false });
+  if (getBooleanInput('output-env-credentials', { required: false, default: !awsProfile })) {
     try {
       // The GitHub Actions toolkit does not have an option to completely unset
       // environment variables, so we overwrite the current value with an empty
@@ -25,6 +26,9 @@ export function cleanup() {
       core.exportVariable('AWS_SESSION_TOKEN', '');
       core.exportVariable('AWS_DEFAULT_REGION', '');
       core.exportVariable('AWS_REGION', '');
+      if (core.getInput('aws-profile')) {
+        core.exportVariable('AWS_PROFILE', '');
+      }
     } catch (error) {
       core.setFailed(errorMessage(error));
     }

src/helpers.ts

@@ -1,3 +1,5 @@
+import * as fs from 'node:fs';
+import * as path from 'node:path';
 import * as core from '@actions/core';
 import type { Credentials, STSClient } from '@aws-sdk/client-sts';
 import { GetCallerIdentityCommand } from '@aws-sdk/client-sts';
@@ -20,6 +22,7 @@ export function translateEnvVariables() {
     'ROLE_EXTERNAL_ID',
     'ROLE_SESSION_NAME',
     'ROLE_SKIP_SESSION_TAGGING',
+    'TRANSITIVE_TAG_KEYS',
     'INLINE_SESSION_POLICY',
     'MANAGED_SESSION_POLICIES',
     'OUTPUT_CREDENTIALS',
@@ -28,6 +31,8 @@ export function translateEnvVariables() {
     'RETRY_MAX_ATTEMPTS',
     'SPECIAL_CHARACTERS_WORKAROUND',
     'USE_EXISTING_CREDENTIALS',
+    'NO_PROXY',
+    'OVERWRITE_AWS_PROFILE',
   ];
   // Treat HTTPS_PROXY as HTTP_PROXY. Precedence is HTTPS_PROXY > HTTP_PROXY
   if (process.env.HTTPS_PROXY) process.env.HTTP_PROXY = process.env.HTTPS_PROXY;
@@ -114,7 +119,14 @@ export async function getCallerIdentity(client: STSClient): Promise<{ Account: s
   if (!identity.Account || !identity.Arn) {
     throw new Error('Could not get Account ID or ARN from STS. Did you set credentials?');
   }
-  return { Account: identity.Account, Arn: identity.Arn, UserId: identity.UserId };
+  const result: { Account: string; Arn: string; UserId?: string } = {
+    Account: identity.Account,
+    Arn: identity.Arn,
+  };
+  if (identity.UserId !== undefined) {
+    result.UserId = identity.UserId;
+  }
+  return result;
 }
 
 // Obtains account ID from STS Client and sets it as output
@@ -184,15 +196,26 @@ export async function retryAndBackoff<T>(
     return await fn();
   } catch (err) {
     if (!isRetryable) {
+      core.debug(`retryAndBackoff: error is not retryable: ${errorMessage(err)}`);
       throw err;
     }
     // It's retryable, so sleep and retry.
-    await sleep(Math.random() * (2 ** retries * base));
-    retries += 1;
-    if (retries >= maxRetries) {
+    const delay = Math.random() * (2 ** retries * base);
+    const nextRetry = retries + 1;
+
+    core.debug(
+      `retryAndBackoff: attempt ${nextRetry} of ${maxRetries} failed: ${errorMessage(err)}. ` +
+        `Retrying after ${Math.floor(delay)}ms.`,
+    );
+
+    await sleep(delay);
+
+    if (nextRetry >= maxRetries) {
+      core.debug('retryAndBackoff: reached max retries; giving up.');
       throw err;
     }
-    return await retryAndBackoff(fn, isRetryable, maxRetries, retries, base);
+
+    return await retryAndBackoff(fn, isRetryable, maxRetries, nextRetry, base);
   }
 }
 
@@ -247,3 +270,88 @@ export function getBooleanInput(name: string, options?: core.InputOptions & { de
       `Support boolean input list: \`true | True | TRUE | false | False | FALSE\``,
   );
 }
+
+// O_NOFOLLOW is undefined on Windows. This sets it to 0 if it's not defined.
+const O_NOFOLLOW: number = (fs.constants as { O_NOFOLLOW?: number }).O_NOFOLLOW ?? 0;
+
+export function isSymlink(filePath: string): boolean {
+  try {
+    return fs.lstatSync(filePath).isSymbolicLink();
+  } catch (err) {
+    if ((err as NodeJS.ErrnoException).code === 'ENOENT') return false;
+    throw err;
+  }
+}
+
+// Refuses if filePath or its parent directory is a symbolic link.
+function refuseSymlinkOnPath(filePath: string): void {
+  const parent = path.dirname(filePath);
+  if (parent !== filePath && isSymlink(parent)) {
+    throw new Error(`Refusing ${filePath} (parent directory is a symbolic link)`);
+  }
+  if (isSymlink(filePath)) {
+    throw new Error(`Refusing ${filePath} (path is a symbolic link)`);
+  }
+}
+
+function assertRegularFile(fd: number, filePath: string): void {
+  const stats = fs.fstatSync(fd);
+  if (!stats.isFile()) {
+    throw new Error(`${filePath} (path is not a regular file)`);
+  }
+}
+
+// ENOENT: file does not exist
+// ELOOP: too many symbolic links (from NOFOLLOW)
+
+export function readFileUtf8(filePath: string): string | null {
+  refuseSymlinkOnPath(filePath);
+  let fd: number;
+  try {
+    fd = fs.openSync(filePath, fs.constants.O_RDONLY | O_NOFOLLOW);
+  } catch (err) {
+    const code = (err as NodeJS.ErrnoException).code;
+    if (code === 'ENOENT') return null;
+    if (code === 'ELOOP') {
+      throw new Error(`Refusing ${filePath} (path is a symbolic link)`);
+    }
+    throw err;
+  }
+  try {
+    assertRegularFile(fd, filePath);
+    return fs.readFileSync(fd, 'utf-8');
+  } finally {
+    fs.closeSync(fd);
+  }
+}
+
+export function writeFileUtf8(filePath: string, content: string, mode = 0o600): void {
+  refuseSymlinkOnPath(filePath);
+  let fd: number;
+  try {
+    fd = fs.openSync(filePath, fs.constants.O_WRONLY | fs.constants.O_CREAT | fs.constants.O_TRUNC | O_NOFOLLOW, mode);
+  } catch (err) {
+    if ((err as NodeJS.ErrnoException).code === 'ELOOP') {
+      throw new Error(`Refusing ${filePath} (path is a symbolic link)`);
+    }
+    throw err;
+  }
+  try {
+    assertRegularFile(fd, filePath);
+    // openSync only applies mode on creation.
+    // If the file already exists, we need to ensure the mode is correct.
+    if (process.platform !== 'win32') {
+      fs.fchmodSync(fd, mode);
+    }
+    fs.writeFileSync(fd, content);
+  } finally {
+    fs.closeSync(fd);
+  }
+}
+
+export function mkdir(dir: string, mode = 0o700): void {
+  fs.mkdirSync(dir, { recursive: true, mode });
+  if (isSymlink(dir)) {
+    throw new Error(`Refusing ${dir} (path is a symbolic link)`);
+  }
+}

src/index.ts

@@ -14,6 +14,7 @@ import {
   unsetCredentials,
   verifyKeys,
 } from './helpers';
+import { writeProfileFiles } from './profileManager';
 
 const DEFAULT_ROLE_DURATION = 3600; // One hour (seconds)
 const ROLE_SESSION_NAME = 'GitHubActions';
@@ -29,6 +30,8 @@ export async function run() {
     const sessionTokenInput = core.getInput('aws-session-token', { required: false });
     const SessionToken = sessionTokenInput === '' ? undefined : sessionTokenInput;
     const region = core.getInput('aws-region', { required: true });
+    const awsProfile = core.getInput('aws-profile', { required: false });
+    const overwriteAwsProfile = getBooleanInput('overwrite-aws-profile', { required: false });
     const roleToAssume = core.getInput('role-to-assume', { required: false });
     const audience = core.getInput('audience', { required: false });
     const maskAccountId = getBooleanInput('mask-aws-account-id', { required: false });
@@ -38,6 +41,7 @@ export async function run() {
       Number.parseInt(core.getInput('role-duration-seconds', { required: false })) || DEFAULT_ROLE_DURATION;
     const roleSessionName = core.getInput('role-session-name', { required: false }) || ROLE_SESSION_NAME;
     const roleSkipSessionTagging = getBooleanInput('role-skip-session-tagging', { required: false });
+    const transitiveTagKeys = core.getMultilineInput('transitive-tag-keys', { required: false });
     const proxyServer = core.getInput('http-proxy', { required: false }) || process.env.HTTP_PROXY;
     const inlineSessionPolicy = core.getInput('inline-session-policy', { required: false });
     const managedSessionPolicies = core.getMultilineInput('managed-session-policies', { required: false }).map((p) => {
@@ -45,7 +49,9 @@ export async function run() {
     });
     const roleChaining = getBooleanInput('role-chaining', { required: false });
     const outputCredentials = getBooleanInput('output-credentials', { required: false });
-    const outputEnvCredentials = getBooleanInput('output-env-credentials', { required: false, default: true });
+    // Default to always outputting environment credentials unless profile is specified. If profile is specified, default to
+    // no environment credentials (but still output them if the user specifically requests it).
+    const outputEnvCredentials = getBooleanInput('output-env-credentials', { required: false, default: !awsProfile });
     const unsetCurrentCredentials = getBooleanInput('unset-current-credentials', { required: false });
     let disableRetry = getBooleanInput('disable-retry', { required: false });
     const specialCharacterWorkaround = getBooleanInput('special-characters-workaround', { required: false });
@@ -56,6 +62,17 @@ export async function run() {
       .split(',')
       .map((s) => s.trim());
     const forceSkipOidc = getBooleanInput('force-skip-oidc', { required: false });
+    const noProxy = core.getInput('no-proxy', { required: false });
+    const globalTimeout = Number.parseInt(core.getInput('action-timeout-s', { required: false })) || 0;
+
+    let timeoutId: NodeJS.Timeout | undefined;
+    if (globalTimeout > 0) {
+      core.info(`Setting a global timeout of ${globalTimeout} seconds for the action`);
+      timeoutId = setTimeout(() => {
+        core.setFailed(`Action timed out after ${globalTimeout} seconds`);
+        process.exit(1);
+      }, globalTimeout * 1000);
+    }
 
     if (forceSkipOidc && roleToAssume && !AccessKeyId && !webIdentityTokenFile) {
       throw new Error(
@@ -106,10 +123,17 @@ export async function run() {
     if (!region.match(REGION_REGEX)) {
       throw new Error(`Region is not valid: ${region}`);
     }
+
     exportRegion(region, outputEnvCredentials);
 
     // Instantiate credentials client
-    const credentialsClient = new CredentialsClient({ region, proxyServer });
+    const clientProps: { region: string; proxyServer?: string; noProxy?: string; roleChaining: boolean } = {
+      region,
+      roleChaining,
+    };
+    if (proxyServer) clientProps.proxyServer = proxyServer;
+    if (noProxy) clientProps.noProxy = noProxy;
+    const credentialsClient = new CredentialsClient(clientProps);
     let sourceAccountId: string;
     let webIdentityToken: string;
 
@@ -118,6 +142,7 @@ export async function run() {
       const validCredentials = await areCredentialsValid(credentialsClient);
       if (validCredentials) {
         core.notice('Pre-existing credentials are valid. No need to generate new ones.');
+        if (timeoutId) clearTimeout(timeoutId);
         return;
       }
       core.notice('No valid credentials exist. Running as normal.');
@@ -146,6 +171,12 @@ export async function run() {
       // the source credentials to already be masked as secrets
       // in any error messages.
       exportCredentials({ AccessKeyId, SecretAccessKey, SessionToken }, outputCredentials, outputEnvCredentials);
+
+      // If using IAM User Credentials, write to profile now so that the assumeRole call can succeed (and also for
+      // credential validation before role assumption).
+      if (awsProfile) {
+        writeProfileFiles(awsProfile, { AccessKeyId, SecretAccessKey, SessionToken }, region, overwriteAwsProfile);
+      }
     } else if (!webIdentityTokenFile && !roleChaining) {
       // Proceed only if credentials can be picked up
       await credentialsClient.validateCredentials(undefined, roleChaining, expectedAccountIds);
@@ -159,7 +190,6 @@ export async function run() {
       await credentialsClient.validateCredentials(AccessKeyId, roleChaining, expectedAccountIds);
       sourceAccountId = await exportAccountId(credentialsClient, maskAccountId);
     }
-
     // Get role credentials if configured to do so
     if (roleToAssume) {
       let roleCredentials: AssumeRoleCommandOutput;
@@ -174,6 +204,7 @@ export async function run() {
               roleDuration,
               roleSessionName,
               roleSkipSessionTagging,
+              transitiveTagKeys,
               webIdentityTokenFile,
               webIdentityToken,
               inlineSessionPolicy,
@@ -190,7 +221,9 @@ export async function run() {
       // First: self-hosted runners. If the GITHUB_ACTIONS environment variable
       //  is set to `true` then we are NOT in a self-hosted runner.
       // Second: Customer provided credentials manually (IAM User keys stored in GH Secrets)
-      if (!process.env.GITHUB_ACTIONS || AccessKeyId) {
+      // If we are using a profile, don't validate credentials yet (since they most likely won't be in the environment).
+      // Wait until after creds are written to the profile file to try validation.
+      if ((!process.env.GITHUB_ACTIONS || AccessKeyId) && !awsProfile) {
         await credentialsClient.validateCredentials(
           roleCredentials.Credentials?.AccessKeyId,
           roleChaining,
@@ -200,14 +233,46 @@ export async function run() {
       if (outputEnvCredentials) {
         await exportAccountId(credentialsClient, maskAccountId);
       }
+
+      // Write profile files if profile mode is enabled
+      if (awsProfile) {
+        if (!roleCredentials.Credentials) {
+          throw new Error('AssumeRole call succeeded but returned no credentials');
+        }
+        // If user provided IAM User Credentials and then we assumed a role, overwrite the profile file to add
+        // the session token. (this only overwrites the profile within a single run of the action).
+        // We then validate the credentials to make sure they work.
+        if (AccessKeyId || !process.env.GITHUB_ACTIONS) {
+          writeProfileFiles(awsProfile, roleCredentials.Credentials, region, true);
+          await credentialsClient.validateCredentials(
+            roleCredentials.Credentials.AccessKeyId,
+            roleChaining,
+            expectedAccountIds,
+          );
+        } else {
+          writeProfileFiles(awsProfile, roleCredentials.Credentials, region, overwriteAwsProfile);
+        }
+
+        if (outputEnvCredentials) {
+          core.exportVariable('AWS_PROFILE', awsProfile);
+        }
+      }
     } else {
       core.info('Proceeding with IAM user credentials');
+
+      if (awsProfile) {
+        if (outputEnvCredentials) {
+          core.exportVariable('AWS_PROFILE', awsProfile);
+        }
+      }
     }
+
+    // Clear timeout on successful completion
+    if (timeoutId) clearTimeout(timeoutId);
   } catch (error) {
     core.setFailed(errorMessage(error));
 
     const showStackTrace = process.env.SHOW_STACK_TRACE;
-
     if (showStackTrace === 'true') {
       throw error;
     }

src/profileManager.ts

@@ -0,0 +1,206 @@
+import * as os from 'node:os';
+import * as path from 'node:path';
+import * as core from '@actions/core';
+import type { Credentials } from '@aws-sdk/client-sts';
+import { mkdir, readFileUtf8, writeFileUtf8 } from './helpers';
+
+/**
+ * Parse an INI-format string into a nested object.
+ * Preserves literal section names (e.g. "profile dev" stays as-is).
+ */
+export function parseIni(iniData: string): Record<string, Record<string, string>> {
+  const result: Record<string, Record<string, string>> = {};
+  let currentSection: string | undefined;
+
+  for (const line of iniData.split(/\r?\n/)) {
+    const trimmed = line.trim();
+    if (!trimmed || trimmed.startsWith(';') || trimmed.startsWith('#')) {
+      continue;
+    }
+
+    const sectionMatch = trimmed.match(/^\[([^\]]*)\]$/);
+    if (sectionMatch) {
+      currentSection = sectionMatch[1] as string;
+      if (currentSection === '__proto__') {
+        currentSection = undefined;
+        continue;
+      }
+      result[currentSection] = result[currentSection] || {};
+      continue;
+    }
+
+    if (currentSection) {
+      const eqIndex = trimmed.indexOf('=');
+      if (eqIndex > 0) {
+        const key = trimmed.substring(0, eqIndex).trim();
+        const value = trimmed.substring(eqIndex + 1).trim();
+        if (key !== '__proto__') {
+          const section = result[currentSection];
+          if (section) {
+            section[key] = value;
+          }
+        }
+      }
+    }
+  }
+
+  return result;
+}
+
+/**
+ * Serialize a nested object into INI-format string.
+ */
+export function stringifyIni(data: Record<string, Record<string, string>>): string {
+  const sections: string[] = [];
+  for (const [sectionName, sectionData] of Object.entries(data)) {
+    const lines: string[] = [`[${sectionName}]`];
+    for (const [key, value] of Object.entries(sectionData)) {
+      lines.push(`${key} = ${value}`);
+    }
+    sections.push(lines.join('\n'));
+  }
+  return `${sections.join('\n\n')}\n`;
+}
+
+interface ProfileFilePaths {
+  credentials: string;
+  config: string;
+}
+
+/**
+ * Get the file paths for AWS credentials and config files
+ * Respects AWS_SHARED_CREDENTIALS_FILE and AWS_CONFIG_FILE environment variables
+ */
+export function getProfileFilePaths(): ProfileFilePaths {
+  const credentialsPath = process.env.AWS_SHARED_CREDENTIALS_FILE || path.join(os.homedir(), '.aws', 'credentials');
+  const configPath = process.env.AWS_CONFIG_FILE || path.join(os.homedir(), '.aws', 'config');
+
+  return {
+    credentials: credentialsPath,
+    config: configPath,
+  };
+}
+
+/**
+ * Ensure the AWS directory exists with secure permissions
+ * Creates the directory with 700 permissions (rwx for owner only)
+ */
+export function ensureAwsDirectoryExists(filePath: string): void {
+  const dir = path.dirname(filePath);
+  core.debug(`Ensuring directory exists: ${dir}`);
+  mkdir(dir, 0o700);
+}
+
+/**
+ * Validate profile name format
+ * Profile names must be non-empty, contain no whitespace, brackets, or path separators
+ */
+export function validateProfileName(profileName: string): void {
+  if (!profileName || profileName.trim() === '') {
+    throw new Error('aws-profile must not be empty');
+  }
+
+  if (/\s/.test(profileName)) {
+    throw new Error('aws-profile must not contain whitespace');
+  }
+
+  // INI section names can't contain brackets
+  if (/[[\]]/.test(profileName)) {
+    throw new Error('aws-profile must not contain brackets');
+  }
+
+  // Prevent path traversal
+  if (profileName.includes('/') || profileName.includes('\\')) {
+    throw new Error('aws-profile must not contain path separators');
+  }
+}
+
+/**
+ * Merge a profile section into an INI file
+ * Reads existing file, updates the specified section, and writes back
+ */
+export function mergeProfileSection(
+  filePath: string,
+  sectionName: string,
+  data: Record<string, string>,
+  overwriteAwsProfile: boolean,
+): void {
+  const fileContent = readFileUtf8(filePath);
+  const existingContent: Record<string, Record<string, string>> = fileContent === null ? {} : parseIni(fileContent);
+
+  if (existingContent[sectionName] && !overwriteAwsProfile) {
+    throw new Error(
+      `Profile with name "${sectionName}" already exists. Please use the overwrite-aws-profile input if you want to overwrite existing profiles.`,
+    );
+  }
+  // Merge: update existing profile or add new one
+  existingContent[sectionName] = data;
+
+  const content = stringifyIni(existingContent);
+
+  core.debug(`Writing profile to ${filePath}`);
+  writeFileUtf8(filePath, content, 0o600);
+}
+
+/**
+ * Write AWS profile files with credentials and configuration
+ * This is the main entry point for profile file operations
+ *
+ * @param profileName - Name of the AWS profile to configure
+ * @param credentials - AWS credentials (access key, secret key, session token)
+ * @param region - AWS region
+ */
+export function writeProfileFiles(
+  profileName: string,
+  credentials: Partial<Credentials>,
+  region: string,
+  overwriteAwsProfile: boolean,
+): void {
+  try {
+    // Validate profile name
+    validateProfileName(profileName);
+
+    const paths = getProfileFilePaths();
+
+    // Ensure .aws directory exists
+    ensureAwsDirectoryExists(paths.credentials);
+    ensureAwsDirectoryExists(paths.config);
+
+    // Prepare credentials data
+    const credentialsData: Record<string, string> = {};
+    if (credentials.AccessKeyId) {
+      credentialsData.aws_access_key_id = credentials.AccessKeyId;
+    }
+    if (credentials.SecretAccessKey) {
+      credentialsData.aws_secret_access_key = credentials.SecretAccessKey;
+    }
+    if (credentials.SessionToken) {
+      credentialsData.aws_session_token = credentials.SessionToken;
+    }
+
+    // Credentials file uses [profileName] syntax
+    const credsSectionName = profileName;
+
+    // Config file uses [profile profileName] syntax, except for 'default'
+    const configSectionName = profileName === 'default' ? 'default' : `profile ${profileName}`;
+
+    // Prepare config data
+    const configData: Record<string, string> = {
+      region: region,
+    };
+
+    // Write to credentials file
+    core.info(`Writing credentials to profile: ${profileName}`);
+    mergeProfileSection(paths.credentials, credsSectionName, credentialsData, overwriteAwsProfile);
+
+    // Write to config file
+    core.info(`Writing config to profile: ${profileName}`);
+    mergeProfileSection(paths.config, configSectionName, configData, overwriteAwsProfile);
+
+    core.info(`✓ Successfully configured AWS profile: ${profileName}`);
+  } catch (error) {
+    throw new Error(
+      `Failed to write AWS profile '${profileName}': ${error instanceof Error ? error.message : String(error)}`,
+    );
+  }
+}

test/ProxyResolver.test.ts

@@ -0,0 +1,100 @@
+import type * as http from 'node:http';
+import { describe, expect, test } from 'vitest';
+import { type ProxyOptions, ProxyResolver } from '../src/ProxyResolver';
+
+describe('ProxyResolver', () => {
+  const mockReq = {} as http.ClientRequest;
+
+  test('returns http proxy for http URLs', () => {
+    const options: ProxyOptions = { httpProxy: 'http://proxy:8080' };
+    const resolver = new ProxyResolver(options);
+
+    expect(resolver.getProxyForUrl('http://example.com', mockReq)).toBe('http://proxy:8080');
+  });
+
+  test('returns https proxy for https URLs', () => {
+    const options: ProxyOptions = { httpsProxy: 'https://proxy:8080' };
+    const resolver = new ProxyResolver(options);
+
+    expect(resolver.getProxyForUrl('https://example.com', mockReq)).toBe('https://proxy:8080');
+  });
+
+  test('returns empty string when no proxy configured', () => {
+    const resolver = new ProxyResolver({});
+
+    expect(resolver.getProxyForUrl('http://example.com', mockReq)).toBe('');
+  });
+
+  test('respects noProxy setting', () => {
+    const options: ProxyOptions = {
+      httpProxy: 'http://proxy:8080',
+      noProxy: 'example.com',
+    };
+    const resolver = new ProxyResolver(options);
+
+    expect(resolver.getProxyForUrl('http://example.com', mockReq)).toBe('');
+    expect(resolver.getProxyForUrl('http://other.com', mockReq)).toBe('http://proxy:8080');
+  });
+
+  test('handles invalid URLs', () => {
+    const resolver = new ProxyResolver({ httpProxy: 'http://proxy:8080' });
+
+    expect(resolver.getProxyForUrl('invalid-url', mockReq)).toBe('');
+  });
+
+  test('handles wildcard noProxy', () => {
+    const options: ProxyOptions = {
+      httpProxy: 'http://proxy:8080',
+      noProxy: '*',
+    };
+    const resolver = new ProxyResolver(options);
+
+    expect(resolver.getProxyForUrl('http://example.com', mockReq)).toBe('');
+  });
+
+  test('handles comma-separated noProxy list', () => {
+    const options: ProxyOptions = {
+      httpProxy: 'http://proxy:8080',
+      noProxy: 'example.com,test.com',
+    };
+    const resolver = new ProxyResolver(options);
+
+    expect(resolver.getProxyForUrl('http://example.com', mockReq)).toBe('');
+    expect(resolver.getProxyForUrl('http://test.com', mockReq)).toBe('');
+    expect(resolver.getProxyForUrl('http://other.com', mockReq)).toBe('http://proxy:8080');
+  });
+
+  test('handles port-specific noProxy', () => {
+    const options: ProxyOptions = {
+      httpProxy: 'http://proxy:8080',
+      noProxy: 'example.com:80',
+    };
+    const resolver = new ProxyResolver(options);
+
+    expect(resolver.getProxyForUrl('http://example.com', mockReq)).toBe('');
+    expect(resolver.getProxyForUrl('http://example.com:8080', mockReq)).toBe('http://proxy:8080');
+  });
+
+  test('handles wildcard domain noProxy', () => {
+    const options: ProxyOptions = {
+      httpProxy: 'http://proxy:8080',
+      noProxy: '*.example.com',
+    };
+    const resolver = new ProxyResolver(options);
+
+    expect(resolver.getProxyForUrl('http://sub.example.com', mockReq)).toBe('');
+    expect(resolver.getProxyForUrl('http://example.com', mockReq)).toBe('http://proxy:8080');
+    expect(resolver.getProxyForUrl('http://other.com', mockReq)).toBe('http://proxy:8080');
+  });
+
+  test('handles empty noProxy entries', () => {
+    const options: ProxyOptions = {
+      httpProxy: 'http://proxy:8080',
+      noProxy: 'example.com, ,test.com',
+    };
+    const resolver = new ProxyResolver(options);
+
+    expect(resolver.getProxyForUrl('http://example.com', mockReq)).toBe('');
+    expect(resolver.getProxyForUrl('http://test.com', mockReq)).toBe('');
+  });
+});

test/assumeRole.test.ts

@@ -0,0 +1,67 @@
+import * as core from '@actions/core';
+import {
+  AssumeRoleWithWebIdentityCommand,
+  GetCallerIdentityCommand,
+  STSClient,
+} from '@aws-sdk/client-sts';
+import { mockClient } from 'aws-sdk-client-mock';
+import { fs, vol } from 'memfs';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import * as helpers from '../src/helpers';
+import { run } from '../src/index';
+import mocks from './mockinputs.test';
+
+vi.mock('node:fs');
+vi.mock('@actions/core');
+
+const mockedSTSClient = mockClient(STSClient);
+
+describe('assumeRoleWithWebIdentityTokenFile', {}, () => {
+  beforeEach(() => {
+    vi.restoreAllMocks();
+    vi.clearAllMocks();
+    mockedSTSClient.reset();
+    vol.reset();
+    helpers.withsleep(() => Promise.resolve());
+    vi.mocked(core.getInput).mockImplementation(mocks.getInput(mocks.WEBIDENTITY_TOKEN_FILE_INPUTS));
+    vi.mocked(core.getMultilineInput).mockReturnValue([]);
+    mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
+    process.env = { ...mocks.envs };
+    fs.mkdirSync('/home/github', { recursive: true });
+  });
+
+  afterEach(() => {
+    helpers.reset();
+  });
+
+  it('refuses when the token file is a symlink and never calls STS', async () => {
+    fs.mkdirSync('/etc', { recursive: true });
+    fs.writeFileSync('/etc/passwd', 'root:x:0:0::/root:/bin/sh');
+    fs.symlinkSync('/etc/passwd', '/home/github/file.txt');
+
+    await run();
+
+    expect(core.setFailed).toHaveBeenCalledWith(expect.stringMatching(/Refusing .* \(.* symbolic link\)/));
+    expect(mockedSTSClient.commandCalls(AssumeRoleWithWebIdentityCommand)).toHaveLength(0);
+    expect(fs.readFileSync('/etc/passwd', 'utf-8')).toBe('root:x:0:0::/root:/bin/sh');
+  });
+
+  it('preserves the existing missing-file error when the token file does not exist', async () => {
+    await run();
+
+    expect(core.setFailed).toHaveBeenCalledWith(expect.stringContaining('Web identity token file does not exist'));
+    expect(mockedSTSClient.commandCalls(AssumeRoleWithWebIdentityCommand)).toHaveLength(0);
+  });
+
+  it('passes token contents to STS when the file is regular', async () => {
+    fs.writeFileSync('/home/github/file.txt', 'real-token');
+    mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
+
+    await run();
+
+    expect(core.setFailed).not.toHaveBeenCalled();
+    const calls = mockedSTSClient.commandCalls(AssumeRoleWithWebIdentityCommand);
+    expect(calls).toHaveLength(1);
+    expect(calls[0]?.args[0].input.WebIdentityToken).toBe('real-token');
+  });
+});

test/cleanup.test.ts

@@ -38,6 +38,26 @@ describe('Configure AWS Credentials cleanup', {}, () => {
     expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', '');
     expect(core.exportVariable).toHaveBeenCalledWith('AWS_REGION', '');
   });
+  it('also clears AWS_PROFILE when aws-profile was set', {}, () => {
+    vi.spyOn(core, 'getInput').mockImplementation((name: string) => {
+      if (name === 'aws-profile') return 'my-profile';
+      if (name === 'output-env-credentials') return 'true';
+      return '';
+    });
+    cleanup();
+    expect(core.setFailed).toHaveBeenCalledTimes(0);
+    expect(core.exportVariable).toHaveBeenCalledTimes(6);
+    expect(core.exportVariable).toHaveBeenCalledWith('AWS_PROFILE', '');
+  });
+  it('skips env cleanup when aws-profile is set without output-env-credentials', {}, () => {
+    vi.spyOn(core, 'getInput').mockImplementation((name: string) => {
+      if (name === 'aws-profile') return 'my-profile';
+      return '';
+    });
+    cleanup();
+    expect(core.setFailed).toHaveBeenCalledTimes(0);
+    expect(core.exportVariable).toHaveBeenCalledTimes(0);
+  });
   it('handles errors', {}, () => {
     vi.spyOn(core, 'exportVariable').mockImplementationOnce(() => {
       throw new Error('Test error');

test/helpers.test.ts

@@ -1,11 +1,16 @@
-import { beforeEach } from 'node:test';
 import * as core from '@actions/core';
-import { describe, expect, it, vi } from 'vitest';
+import { fs, vol } from 'memfs';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
 import * as helpers from '../src/helpers';
 
+vi.mock('node:fs');
+vi.mock('@actions/core');
+
 describe('Configure AWS Credentials helpers', {}, () => {
   beforeEach(() => {
     vi.restoreAllMocks();
+    vi.clearAllMocks();
+    vol.reset();
   });
   it('removes brackets from GitHub Actor', {}, () => {
     const actor = 'actor[bot]';
@@ -61,4 +66,133 @@ describe('Configure AWS Credentials helpers', {}, () => {
     expect(core.setSecret).toHaveBeenCalledTimes(3);
     expect(core.exportVariable).toHaveBeenCalledTimes(0);
   });
+
+  it('verifies credentials without special characters', {}, () => {
+    expect(helpers.verifyKeys({ AccessKeyId: 'AKIATEST', SecretAccessKey: 'secretkey' })).toBe(true);
+    expect(helpers.verifyKeys({ AccessKeyId: 'AKIA!@#$', SecretAccessKey: 'secret' })).toBe(false);
+    expect(helpers.verifyKeys(undefined)).toBe(false);
+  });
+
+  it('translates environment variables', {}, () => {
+    process.env.AWS_REGION = 'us-east-1';
+    process.env.HTTPS_PROXY = 'https://proxy:8080';
+    helpers.translateEnvVariables();
+    expect(process.env['INPUT_AWS-REGION']).toBe('us-east-1');
+    expect(process.env.HTTP_PROXY).toBe('https://proxy:8080');
+  });
+
+  it('handles getBooleanInput correctly', {}, () => {
+    vi.spyOn(core, 'getInput').mockReturnValue('true');
+    expect(helpers.getBooleanInput('test')).toBe(true);
+    
+    vi.spyOn(core, 'getInput').mockReturnValue('false');
+    expect(helpers.getBooleanInput('test')).toBe(false);
+    
+    vi.spyOn(core, 'getInput').mockReturnValue('');
+    expect(helpers.getBooleanInput('test', { default: true })).toBe(true);
+    
+    vi.spyOn(core, 'getInput').mockReturnValue('invalid');
+    expect(() => helpers.getBooleanInput('test')).toThrow();
+  });
+
+  it('clears session token when not provided', {}, () => {
+    vi.spyOn(core, 'setSecret').mockImplementation(() => {});
+    vi.spyOn(core, 'exportVariable').mockImplementation(() => {});
+    process.env.AWS_SESSION_TOKEN = 'old-token';
+    helpers.exportCredentials({ AccessKeyId: 'test', SecretAccessKey: 'test' }, false, true);
+    expect(core.exportVariable).toHaveBeenCalledWith('AWS_SESSION_TOKEN', '');
+  });
+
+  describe('filesystem helpers', {}, () => {
+    describe('isSymlink', {}, () => {
+      it('returns true for a symlink', {}, () => {
+        fs.mkdirSync('/dir', { recursive: true });
+        fs.writeFileSync('/dir/target', 'data');
+        fs.symlinkSync('/dir/target', '/dir/link');
+        expect(helpers.isSymlink('/dir/link')).toBe(true);
+      });
+
+      it('returns false for a regular file', {}, () => {
+        fs.mkdirSync('/dir', { recursive: true });
+        fs.writeFileSync('/dir/file', 'data');
+        expect(helpers.isSymlink('/dir/file')).toBe(false);
+      });
+
+      it('returns false for a missing path', {}, () => {
+        expect(helpers.isSymlink('/nonexistent')).toBe(false);
+      });
+    });
+
+    describe('readFileUtf8', {}, () => {
+      it('returns content for a regular file', {}, () => {
+        fs.mkdirSync('/dir', { recursive: true });
+        fs.writeFileSync('/dir/file', 'hello');
+        expect(helpers.readFileUtf8('/dir/file')).toBe('hello');
+      });
+
+      it('returns null when the file does not exist', {}, () => {
+        fs.mkdirSync('/dir', { recursive: true });
+        expect(helpers.readFileUtf8('/dir/missing')).toBe(null);
+      });
+
+      it('refuses to read through a symlink at the target', {}, () => {
+        fs.mkdirSync('/dir', { recursive: true });
+        fs.writeFileSync('/dir/secret', 'sensitive');
+        fs.symlinkSync('/dir/secret', '/dir/link');
+        expect(() => helpers.readFileUtf8('/dir/link')).toThrow(/Refusing .* \(.* symbolic link\)/);
+      });
+
+      it('refuses to read when the parent directory is a symlink', {}, () => {
+        fs.mkdirSync('/real/.aws', { recursive: true });
+        fs.writeFileSync('/real/.aws/credentials', 'data');
+        fs.mkdirSync('/home', { recursive: true });
+        fs.symlinkSync('/real/.aws', '/home/.aws');
+        expect(() => helpers.readFileUtf8('/home/.aws/credentials')).toThrow(/Refusing .* \(.* symbolic link\)/);
+      });
+
+      it('refuses to read when the path is a directory', {}, () => {
+        fs.mkdirSync('/dir/subdir', { recursive: true });
+        expect(() => helpers.readFileUtf8('/dir/subdir')).toThrow(/not a regular file/);
+      });
+    });
+
+    describe('writeFileUtf8', {}, () => {
+      it('writes content with the specified mode', {}, () => {
+        fs.mkdirSync('/dir', { recursive: true });
+        helpers.writeFileUtf8('/dir/file', 'payload', 0o600);
+        expect(fs.readFileSync('/dir/file', 'utf-8')).toBe('payload');
+        expect(fs.statSync('/dir/file').mode & 0o777).toBe(0o600);
+      });
+
+      it('refuses to follow a symlink at the target and leaves the target file untouched', {}, () => {
+        fs.mkdirSync('/dir', { recursive: true });
+        fs.writeFileSync('/dir/target', 'original');
+        fs.symlinkSync('/dir/target', '/dir/link');
+        expect(() => helpers.writeFileUtf8('/dir/link', 'attacker', 0o600)).toThrow(/Refusing .* \(.* symbolic link\)/);
+        expect(fs.readFileSync('/dir/target', 'utf-8')).toBe('original');
+      });
+
+      it.skipIf(process.platform === 'win32')('tightens mode on existing files', () => {
+        fs.mkdirSync('/dir', { recursive: true });
+        fs.writeFileSync('/dir/file', 'old', { mode: 0o644 });
+        helpers.writeFileUtf8('/dir/file', 'new', 0o600);
+        expect(fs.statSync('/dir/file').mode & 0o777).toBe(0o600);
+      });
+    });
+
+    describe('mkdir', {}, () => {
+      it('is idempotent on a regular directory', {}, () => {
+        helpers.mkdir('/some/nested/dir', 0o700);
+        helpers.mkdir('/some/nested/dir', 0o700);
+        expect(fs.statSync('/some/nested/dir').isDirectory()).toBe(true);
+      });
+
+      it('refuses when the target directory is a symlink', {}, () => {
+        fs.mkdirSync('/real', { recursive: true });
+        fs.mkdirSync('/home', { recursive: true });
+        fs.symlinkSync('/real', '/home/.aws');
+        expect(() => helpers.mkdir('/home/.aws', 0o700)).toThrow(/Refusing .* \(.* symbolic link\)/);
+      });
+    });
+  });
 });

test/index.test.ts

@@ -10,6 +10,7 @@ import { fs, vol } from 'memfs';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 import { CredentialsClient } from '../src/CredentialsClient';
 import { run } from '../src/index';
+import * as profileManager from '../src/profileManager';
 import mocks from './mockinputs.test';
 
 const mockedSTSClient = mockClient(STSClient);
@@ -341,10 +342,12 @@ describe('Configure AWS Credentials', {}, () => {
     });
 
     it('skips OIDC when force-skip-oidc is true with IAM credentials', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_ASSUMEROLE_INPUTS,
-        'force-skip-oidc': 'true'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_ASSUMEROLE_INPUTS,
+          'force-skip-oidc': 'true',
+        }),
+      );
       vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
       mockedSTSClient.on(AssumeRoleCommand).resolves(mocks.outputs.STS_CREDENTIALS);
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
@@ -353,17 +356,19 @@ describe('Configure AWS Credentials', {}, () => {
         .mockResolvedValueOnce({ accessKeyId: 'MYAWSACCESSKEYID' })
         .mockResolvedValueOnce({ accessKeyId: 'STSAWSACCESSKEYID' });
       process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
-      
+
       await run();
       expect(core.getIDToken).not.toHaveBeenCalled();
       expect(core.setFailed).not.toHaveBeenCalled();
     });
 
     it('skips OIDC when force-skip-oidc is true with web identity token file', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.WEBIDENTITY_TOKEN_FILE_INPUTS,
-        'force-skip-oidc': 'true'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.WEBIDENTITY_TOKEN_FILE_INPUTS,
+          'force-skip-oidc': 'true',
+        }),
+      );
       vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
       mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
@@ -372,7 +377,7 @@ describe('Configure AWS Credentials', {}, () => {
       vol.reset();
       fs.mkdirSync('/home/github', { recursive: true });
       fs.writeFileSync('/home/github/file.txt', 'test-token');
-      
+
       await run();
       expect(core.getIDToken).not.toHaveBeenCalled();
       expect(core.info).toHaveBeenCalledWith('Assuming role with web identity token file');
@@ -380,34 +385,38 @@ describe('Configure AWS Credentials', {}, () => {
     });
 
     it('fails when force-skip-oidc is true but no alternative credentials provided', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        'role-to-assume': 'arn:aws:iam::111111111111:role/MY-ROLE',
-        'aws-region': 'fake-region-1',
-        'force-skip-oidc': 'true'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          'role-to-assume': 'arn:aws:iam::111111111111:role/MY-ROLE',
+          'aws-region': 'fake-region-1',
+          'force-skip-oidc': 'true',
+        }),
+      );
       process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
-      
+
       await run();
       expect(core.setFailed).toHaveBeenCalledWith(
-        "If 'force-skip-oidc' is true and 'role-to-assume' is set, 'aws-access-key-id' or 'web-identity-token-file' must be set"
+        "If 'force-skip-oidc' is true and 'role-to-assume' is set, 'aws-access-key-id' or 'web-identity-token-file' must be set",
       );
     });
 
     it('allows force-skip-oidc without role-to-assume', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_USER_INPUTS,
-        'force-skip-oidc': 'true'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'force-skip-oidc': 'true',
+        }),
+      );
       vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
-      
+
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
       vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValue({
         accessKeyId: 'MYAWSACCESSKEYID',
       });
-      
+
       process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
-      
+
       await run();
       expect(core.getIDToken).not.toHaveBeenCalled();
       expect(core.info).toHaveBeenCalledWith('Proceeding with IAM user credentials');
@@ -415,15 +424,17 @@ describe('Configure AWS Credentials', {}, () => {
     });
 
     it('uses OIDC when force-skip-oidc is false (default behavior)', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.GH_OIDC_INPUTS,
-        'force-skip-oidc': 'false'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.GH_OIDC_INPUTS,
+          'force-skip-oidc': 'false',
+        }),
+      );
       vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
       mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
-      
+
       await run();
       expect(core.getIDToken).toHaveBeenCalledWith('');
       expect(core.info).toHaveBeenCalledWith('Assuming role with OIDC');
@@ -436,7 +447,7 @@ describe('Configure AWS Credentials', {}, () => {
       mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
-      
+
       await run();
       expect(core.getIDToken).toHaveBeenCalledWith('');
       expect(core.info).toHaveBeenCalledWith('Assuming role with OIDC');
@@ -444,12 +455,14 @@ describe('Configure AWS Credentials', {}, () => {
     });
 
     it('works with role chaining when force-skip-oidc is true', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.EXISTING_ROLE_INPUTS,
-        'force-skip-oidc': 'true',
-        'aws-access-key-id': 'MYAWSACCESSKEYID',
-        'aws-secret-access-key': 'MYAWSSECRETACCESSKEY'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.EXISTING_ROLE_INPUTS,
+          'force-skip-oidc': 'true',
+          'aws-access-key-id': 'MYAWSACCESSKEYID',
+          'aws-secret-access-key': 'MYAWSSECRETACCESSKEY',
+        }),
+      );
       vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
       mockedSTSClient.on(AssumeRoleCommand).resolves(mocks.outputs.STS_CREDENTIALS);
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
@@ -458,164 +471,262 @@ describe('Configure AWS Credentials', {}, () => {
         .mockResolvedValueOnce({ accessKeyId: 'MYAWSACCESSKEYID' })
         .mockResolvedValueOnce({ accessKeyId: 'STSAWSACCESSKEYID' });
       process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
-      
+
       await run();
       expect(core.getIDToken).not.toHaveBeenCalled();
       expect(core.setFailed).not.toHaveBeenCalled();
     });
   });
 
-  describe('Account ID Validation', {}, () => {  
+  describe('Account ID Validation', {}, () => {
     beforeEach(() => {
       vi.clearAllMocks();
       mockedSTSClient.reset();
     });
-    
+
     it('succeeds when account ID matches allowed list', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_USER_INPUTS,
-        'allowed-account-ids': '111111111111'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'allowed-account-ids': '111111111111',
+        }),
+      );
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
       vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValue({
         accessKeyId: 'MYAWSACCESSKEYID',
       });
-      
+
       await run();
       expect(core.setFailed).not.toHaveBeenCalled();
       expect(core.info).toHaveBeenCalledWith('Proceeding with IAM user credentials');
     });
 
     it('succeeds with multiple allowed account IDs when account matches', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_USER_INPUTS,
-        'allowed-account-ids': '999999999999,111111111111,222222222222'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'allowed-account-ids': '999999999999,111111111111,222222222222',
+        }),
+      );
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
       vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValue({
         accessKeyId: 'MYAWSACCESSKEYID',
       });
-      
+
       await run();
       expect(core.setFailed).not.toHaveBeenCalled();
     });
 
     it('fails when account ID does not match allowed list', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_USER_INPUTS,
-        'allowed-account-ids': '999999999999'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'allowed-account-ids': '999999999999',
+        }),
+      );
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
       vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValue({
         accessKeyId: 'MYAWSACCESSKEYID',
       });
-      
+
       await run();
       expect(core.setFailed).toHaveBeenCalledWith(
-        'The account ID of the provided credentials (111111111111) does not match any of the expected account IDs: 999999999999'
+        'The account ID of the provided credentials (111111111111) does not match any of the expected account IDs: 999999999999',
       );
     });
 
     it('fails when account ID does not match any in multiple allowed accounts', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_USER_INPUTS,
-        'allowed-account-ids': '999999999999,888888888888'
-      }));    
-    
-    mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'allowed-account-ids': '999999999999,888888888888',
+        }),
+      );
+
+      mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
       vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValue({
         accessKeyId: 'MYAWSACCESSKEYID',
-      });    
-      
+      });
+
       await run();
       expect(core.setFailed).toHaveBeenCalledWith(
-        'The account ID of the provided credentials (111111111111) does not match any of the expected account IDs: 999999999999, 888888888888'
+        'The account ID of the provided credentials (111111111111) does not match any of the expected account IDs: 999999999999, 888888888888',
       );
     });
 
     it('works with assume role when account ID matches', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_ASSUMEROLE_INPUTS,
-        'allowed-account-ids': '111111111111'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_ASSUMEROLE_INPUTS,
+          'allowed-account-ids': '111111111111',
+        }),
+      );
       mockedSTSClient.on(AssumeRoleCommand).resolves(mocks.outputs.STS_CREDENTIALS);
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
       vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials')
         .mockResolvedValueOnce({ accessKeyId: 'MYAWSACCESSKEYID' })
         .mockResolvedValueOnce({ accessKeyId: 'STSAWSACCESSKEYID' });
-      
+
       await run();
       expect(core.setFailed).not.toHaveBeenCalled();
       expect(core.info).toHaveBeenCalledWith('Authenticated as assumedRoleId AROAFAKEASSUMEDROLEID');
     });
 
     it('works with OIDC when account ID matches', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.GH_OIDC_INPUTS,
-        'allowed-account-ids': '111111111111'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.GH_OIDC_INPUTS,
+          'allowed-account-ids': '111111111111',
+        }),
+      );
       vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
       mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
-      
-      await run();        
-            expect(core.setFailed).not.toHaveBeenCalled();
+
+      await run();
+      expect(core.setFailed).not.toHaveBeenCalled();
       expect(core.info).toHaveBeenCalledWith('Authenticated as assumedRoleId AROAFAKEASSUMEDROLEID');
     });
 
     it('handles GetCallerIdentity API failure gracefully', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_USER_INPUTS,
-        'allowed-account-ids': '111111111111'
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'allowed-account-ids': '111111111111',
+        }),
+      );
       mockedSTSClient.on(GetCallerIdentityCommand).rejects(new Error('API Error'));
       // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
       vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValue({
         accessKeyId: 'MYAWSACCESSKEYID',
       });
-      
+
       await run();
       expect(core.setFailed).toHaveBeenCalledWith('Could not validate account ID of credentials: API Error');
     });
 
     it('ignores validation when allowed-account-ids is empty', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_USER_INPUTS,
-        'allowed-account-ids': ''
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'allowed-account-ids': '',
+        }),
+      );
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
       vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValue({
         accessKeyId: 'MYAWSACCESSKEYID',
       });
-      
+
       await run();
       expect(core.setFailed).not.toHaveBeenCalled();
       expect(core.info).toHaveBeenCalledWith('Proceeding with IAM user credentials');
     });
 
     it('handles whitespace in allowed-account-ids input', async () => {
-      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput({
-        ...mocks.IAM_USER_INPUTS,
-        'allowed-account-ids': ' 111111111111 , 222222222222 '
-      }));
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'allowed-account-ids': ' 111111111111 , 222222222222 ',
+        }),
+      );
       mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
       // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
       vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValue({
         accessKeyId: 'MYAWSACCESSKEYID',
       });
-      
+
       await run();
       expect(core.setFailed).not.toHaveBeenCalled();
     });
-  });    
-    
+  });
+
+  describe('Global Timeout Configuration', {}, () => {
+    beforeEach(() => {
+      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput(mocks.IAM_USER_INPUTS));
+      mockedSTSClient.on(GetCallerIdentityCommand).resolvesOnce({ ...mocks.outputs.GET_CALLER_IDENTITY });
+      // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
+      vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValueOnce({
+        accessKeyId: 'MYAWSACCESSKEYID',
+      });
+    });
+
+    it('sets timeout when action-timeout-s is provided', async () => {
+      const setTimeoutSpy = vi.spyOn(global, 'setTimeout');
+      const clearTimeoutSpy = vi.spyOn(global, 'clearTimeout');
+      const infoSpy = vi.spyOn(core, 'info');
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'action-timeout-s': '30',
+        }),
+      );
+
+      await run();
+
+      expect(infoSpy).toHaveBeenCalledWith('Setting a global timeout of 30 seconds for the action');
+      expect(setTimeoutSpy).toHaveBeenCalledWith(expect.any(Function), 30000);
+      expect(clearTimeoutSpy).toHaveBeenCalledWith(expect.any(Object));
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('does not set timeout when action-timeout-s is 0', async () => {
+      const setTimeoutSpy = vi.spyOn(global, 'setTimeout');
+      const infoSpy = vi.spyOn(core, 'info');
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'action-timeout-s': '0',
+        }),
+      );
+
+      await run();
+
+      expect(infoSpy).not.toHaveBeenCalledWith(expect.stringContaining('Setting a global timeout'));
+      expect(setTimeoutSpy).not.toHaveBeenCalled();
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('does not set timeout when action-timeout-s is not provided', async () => {
+      const setTimeoutSpy = vi.spyOn(global, 'setTimeout');
+      const infoSpy = vi.spyOn(core, 'info');
+
+      await run();
+
+      expect(infoSpy).not.toHaveBeenCalledWith(expect.stringContaining('Setting a global timeout'));
+      expect(setTimeoutSpy).not.toHaveBeenCalled();
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('timeout callback calls setFailed and exits process', async () => {
+      const setTimeoutSpy = vi.spyOn(global, 'setTimeout');
+      const processExitSpy = vi.spyOn(process, 'exit').mockImplementation(() => undefined as never);
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'action-timeout-s': '5',
+        }),
+      );
+
+      await run();
+
+      // Get the timeout callback function
+      const timeoutCallback = setTimeoutSpy.mock.calls[0][0] as () => void;
+      
+      // Execute the timeout callback
+      timeoutCallback();
+
+      expect(core.setFailed).toHaveBeenCalledWith('Action timed out after 5 seconds');
+      expect(processExitSpy).toHaveBeenCalledWith(1);
+    });
+  });
+
   describe('HTTP Proxy Configuration', {}, () => {
     beforeEach(() => {
       vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput(mocks.GH_OIDC_INPUTS));
@@ -630,12 +741,12 @@ describe('Configure AWS Credentials', {}, () => {
       vi.spyOn(core, 'getInput').mockImplementation(
         mocks.getInput({
           ...mocks.GH_OIDC_INPUTS,
-          'http-proxy': 'http://proxy.example.com:8080'
-        })
+          'http-proxy': 'http://proxy.example.com:8080',
+        }),
       );
-      
+
       await run();
-      
+
       expect(infoSpy).toHaveBeenCalledWith('Configuring proxy handler for STS client');
       expect(core.setFailed).not.toHaveBeenCalled();
     });
@@ -643,9 +754,9 @@ describe('Configure AWS Credentials', {}, () => {
     it('configures proxy from HTTP_PROXY environment variable', async () => {
       const infoSpy = vi.spyOn(core, 'info');
       process.env.HTTP_PROXY = 'http://proxy.example.com:8080';
-      
+
       await run();
-      
+
       expect(infoSpy).toHaveBeenCalledWith('Configuring proxy handler for STS client');
       expect(core.setFailed).not.toHaveBeenCalled();
     });
@@ -653,9 +764,9 @@ describe('Configure AWS Credentials', {}, () => {
     it('configures proxy from HTTPS_PROXY environment variable', async () => {
       const infoSpy = vi.spyOn(core, 'info');
       process.env.HTTPS_PROXY = 'https://proxy.example.com:8080';
-      
+
       await run();
-      
+
       expect(infoSpy).toHaveBeenCalledWith('Configuring proxy handler for STS client');
       expect(core.setFailed).not.toHaveBeenCalled();
     });
@@ -666,30 +777,248 @@ describe('Configure AWS Credentials', {}, () => {
       vi.spyOn(core, 'getInput').mockImplementation(
         mocks.getInput({
           ...mocks.GH_OIDC_INPUTS,
-          'http-proxy': 'http://input-proxy.example.com:8080'
-        })
+          'http-proxy': 'http://input-proxy.example.com:8080',
+        }),
       );
-      
+
       await run();
-      
+
       expect(infoSpy).toHaveBeenCalledWith('Configuring proxy handler for STS client');
       expect(core.setFailed).not.toHaveBeenCalled();
     });
 
     it('properly configures proxy agent in STS client', async () => {
       const infoSpy = vi.spyOn(core, 'info');
-      
+
       vi.spyOn(core, 'getInput').mockImplementation(
         mocks.getInput({
           ...mocks.GH_OIDC_INPUTS,
-          'http-proxy': 'http://proxy.example.com:8080'
-        })
+          'http-proxy': 'http://proxy.example.com:8080',
+        }),
       );
-      
+
       await run();
-      
+
       expect(infoSpy).toHaveBeenCalledWith('Configuring proxy handler for STS client');
       expect(core.setFailed).not.toHaveBeenCalled();
     });
+
+    it('configures no-proxy setting', async () => {
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.GH_OIDC_INPUTS,
+          'http-proxy': 'http://proxy.example.com:8080',
+          'no-proxy': 'localhost,127.0.0.1',
+        }),
+      );
+
+      await run();
+
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('works without proxy configuration', async () => {
+      await run();
+
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('AWS Profile Support', {}, () => {
+    beforeEach(() => {
+      vi.clearAllMocks();
+      mockedSTSClient.reset();
+      vi.mock('node:fs');
+      vol.reset();
+    });
+
+    it('writes profile files with OIDC authentication', async () => {
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.GH_OIDC_INPUTS,
+          'aws-profile': 'dev',
+        }),
+      );
+      vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
+      mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
+      mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
+      process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
+
+      await run();
+
+      // Verify credentials were NOT exported to environment variables
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_ACCESS_KEY_ID', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_SECRET_ACCESS_KEY', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_SESSION_TOKEN', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_PROFILE', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_REGION', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_DEFAULT_REGION', expect.anything());
+
+      // Verify profile files were written
+      expect(core.info).toHaveBeenCalledWith('Writing credentials to profile: dev');
+      expect(core.info).toHaveBeenCalledWith('Writing config to profile: dev');
+      expect(core.info).toHaveBeenCalledWith('✓ Successfully configured AWS profile: dev');
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('writes profile files with IAM user credentials', async () => {
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_USER_INPUTS,
+          'aws-profile': 'production',
+        }),
+      );
+      mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
+      // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
+      vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials').mockResolvedValue({
+        accessKeyId: 'MYAWSACCESSKEYID',
+      });
+
+      await run();
+
+      // Verify credentials were NOT exported to environment variables
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_ACCESS_KEY_ID', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_SECRET_ACCESS_KEY', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_SESSION_TOKEN', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_PROFILE', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_REGION', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_DEFAULT_REGION', expect.anything());
+
+      // Verify profile files were written
+      expect(core.info).toHaveBeenCalledWith('Writing credentials to profile: production');
+      expect(core.info).toHaveBeenCalledWith('Writing config to profile: production');
+      expect(core.info).toHaveBeenCalledWith('✓ Successfully configured AWS profile: production');
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('writes profile files with IAM user role assumption', async () => {
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.IAM_ASSUMEROLE_INPUTS,
+          'aws-profile': 'assumed-role',
+        }),
+      );
+      mockedSTSClient.on(AssumeRoleCommand).resolves(mocks.outputs.STS_CREDENTIALS);
+      mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
+      // biome-ignore lint/suspicious/noExplicitAny: any required to mock private method
+      vi.spyOn(CredentialsClient.prototype as any, 'loadCredentials')
+        .mockResolvedValueOnce({ accessKeyId: 'MYAWSACCESSKEYID' })
+        .mockResolvedValueOnce({ accessKeyId: 'STSAWSACCESSKEYID' });
+
+      vi.spyOn(profileManager, 'writeProfileFiles');
+      await run();
+
+      // Verify credentials were NOT exported to environment variables
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_ACCESS_KEY_ID', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_SECRET_ACCESS_KEY', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_SESSION_TOKEN', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_PROFILE', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_REGION', expect.anything());
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_DEFAULT_REGION', expect.anything());
+
+      // Verify profile files were written
+      expect(core.info).toHaveBeenCalledWith('Writing credentials to profile: assumed-role');
+      expect(core.info).toHaveBeenCalledWith('Writing config to profile: assumed-role');
+      expect(core.info).toHaveBeenCalledWith('✓ Successfully configured AWS profile: assumed-role');
+
+      // Verify profile files were written twice (first to write access key id and access key, second to write
+      // actual session token after role assumption
+      expect(profileManager.writeProfileFiles).toHaveBeenCalledTimes(2);
+
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('respects output-env-credentials=true with profiles', async () => {
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.GH_OIDC_INPUTS,
+          'aws-profile': 'dev',
+          'output-env-credentials': 'true',
+        }),
+      );
+      vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
+      mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
+      mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
+      process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
+
+      await run();
+
+      // verify that env vars were exported
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_ACCESS_KEY_ID', 'STSAWSACCESSKEYID');
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_SECRET_ACCESS_KEY', 'STSAWSSECRETACCESSKEY');
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_SESSION_TOKEN', 'STSAWSSESSIONTOKEN');
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_PROFILE', 'dev');
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_REGION', 'fake-region-1');
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', 'fake-region-1');
+
+      // Verify profile files were still written
+      expect(core.info).toHaveBeenCalledWith('Writing credentials to profile: dev');
+      expect(core.info).toHaveBeenCalledWith('Writing config to profile: dev');
+      expect(core.info).toHaveBeenCalledWith('✓ Successfully configured AWS profile: dev');
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('maintains backward compatibility when aws-profile is not specified', async () => {
+      vi.spyOn(core, 'getInput').mockImplementation(mocks.getInput(mocks.GH_OIDC_INPUTS));
+      vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
+      mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
+      mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
+      process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
+
+      await run();
+
+      // Verify credentials WERE exported to environment variables (backward compatibility)
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_ACCESS_KEY_ID', 'STSAWSACCESSKEYID');
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_SECRET_ACCESS_KEY', 'STSAWSSECRETACCESSKEY');
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_SESSION_TOKEN', 'STSAWSSESSIONTOKEN');
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_REGION', 'fake-region-1');
+      expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', 'fake-region-1');
+
+      // Verify AWS_PROFILE was NOT exported
+      expect(core.exportVariable).not.toHaveBeenCalledWith('AWS_PROFILE', expect.anything());
+
+      // Verify profile files were NOT written
+      expect(core.info).not.toHaveBeenCalledWith(expect.stringContaining('Writing credentials to profile'));
+      expect(core.info).not.toHaveBeenCalledWith(expect.stringContaining('✓ Successfully configured AWS profile:'));
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('handles default profile correctly', async () => {
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.GH_OIDC_INPUTS,
+          'aws-profile': 'default',
+        }),
+      );
+      vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
+      mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
+      mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
+      process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
+
+      await run();
+
+      // Verify profile files were written for 'default' profile
+      expect(core.info).toHaveBeenCalledWith('Writing credentials to profile: default');
+      expect(core.info).toHaveBeenCalledWith('Writing config to profile: default');
+      expect(core.info).toHaveBeenCalledWith('✓ Successfully configured AWS profile: default');
+      expect(core.setFailed).not.toHaveBeenCalled();
+    });
+
+    it('rejects invalid profile names with whitespace', async () => {
+      vi.spyOn(core, 'getInput').mockImplementation(
+        mocks.getInput({
+          ...mocks.GH_OIDC_INPUTS,
+          'aws-profile': 'invalid profile',
+        }),
+      );
+      vi.spyOn(core, 'getIDToken').mockResolvedValue('testoidctoken');
+      mockedSTSClient.on(AssumeRoleWithWebIdentityCommand).resolves(mocks.outputs.STS_CREDENTIALS);
+      mockedSTSClient.on(GetCallerIdentityCommand).resolves({ ...mocks.outputs.GET_CALLER_IDENTITY });
+      process.env.ACTIONS_ID_TOKEN_REQUEST_TOKEN = 'fake-token';
+
+      await run();
+
+      expect(core.setFailed).toHaveBeenCalledWith(expect.stringContaining('whitespace'));
+    });
   });
 });

test/profileManager.test.ts

@@ -0,0 +1,790 @@
+import * as core from '@actions/core';
+import { fs, vol } from 'memfs';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import {
+  ensureAwsDirectoryExists,
+  getProfileFilePaths,
+  mergeProfileSection,
+  parseIni,
+  stringifyIni,
+  validateProfileName,
+  writeProfileFiles,
+} from '../src/profileManager';
+
+vi.mock('node:fs');
+vi.mock('@actions/core');
+
+describe('Profile Manager', {}, () => {
+  beforeEach(() => {
+    vi.restoreAllMocks();
+    vi.clearAllMocks();
+    vol.reset();
+  });
+
+  describe('parseIni', {}, () => {
+    it('parses a single section', {}, () => {
+      const result = parseIni('[dev]\naws_access_key_id=AKIA\naws_secret_access_key=secret\n');
+      expect(result.dev).toEqual({ aws_access_key_id: 'AKIA', aws_secret_access_key: 'secret' });
+    });
+
+    it('parses multiple sections', {}, () => {
+      const result = parseIni('[dev]\nkey=dev_val\n\n[prod]\nkey=prod_val\n');
+      expect(result.dev.key).toBe('dev_val');
+      expect(result.prod.key).toBe('prod_val');
+    });
+
+    it('skips comments and empty lines', {}, () => {
+      const result = parseIni('# comment\n; another comment\n\n[dev]\nkey=val\n');
+      expect(result.dev).toEqual({ key: 'val' });
+    });
+
+    it('trims whitespace around keys and values', {}, () => {
+      const result = parseIni('[dev]\n  key  =  val  \n');
+      expect(result.dev.key).toBe('val');
+    });
+
+    it('preserves section names with spaces (e.g. profile prefix)', {}, () => {
+      const result = parseIni('[profile dev]\nregion=us-east-1\n');
+      expect(result['profile dev']).toEqual({ region: 'us-east-1' });
+    });
+
+    it('guards against __proto__ section pollution', {}, () => {
+      const result = parseIni('[__proto__]\npolluted=true\n[safe]\nkey=val\n');
+      expect(result.__proto__).not.toHaveProperty('polluted');
+      expect(result.safe).toEqual({ key: 'val' });
+    });
+
+    it('guards against __proto__ key pollution', {}, () => {
+      const result = parseIni('[dev]\n__proto__=evil\naws_access_key_id=AKIA\n');
+      expect(result.dev).toEqual({ aws_access_key_id: 'AKIA' });
+      expect(result.dev).not.toHaveProperty('__proto__', 'evil');
+    });
+
+    it('handles values containing equals signs', {}, () => {
+      const result = parseIni('[dev]\naws_session_token=FwoGZXIvYXdzEBYa/base64==\n');
+      expect(result.dev.aws_session_token).toBe('FwoGZXIvYXdzEBYa/base64==');
+    });
+
+    it('handles empty values', {}, () => {
+      const result = parseIni('[dev]\ncli_pager=\n');
+      expect(result.dev.cli_pager).toBe('');
+    });
+
+    it('returns empty object for empty input', {}, () => {
+      expect(parseIni('')).toEqual({});
+    });
+
+    it('returns empty object for whitespace-only input', {}, () => {
+      expect(parseIni('   \n\n  \n')).toEqual({});
+    });
+
+    it('handles Windows line endings (CRLF)', {}, () => {
+      const result = parseIni('[dev]\r\naws_access_key_id=AKIA\r\naws_secret_access_key=secret\r\n');
+      expect(result.dev).toEqual({ aws_access_key_id: 'AKIA', aws_secret_access_key: 'secret' });
+    });
+  });
+
+  describe('stringifyIni', {}, () => {
+    it('serializes a single section', {}, () => {
+      const result = stringifyIni({ dev: { key: 'val' } });
+      expect(result).toBe('[dev]\nkey = val\n');
+    });
+
+    it('serializes multiple sections with blank line separator', {}, () => {
+      const result = stringifyIni({ dev: { a: '1' }, prod: { b: '2' } });
+      expect(result).toBe('[dev]\na = 1\n\n[prod]\nb = 2\n');
+    });
+
+    it('round-trips through parseIni', {}, () => {
+      const data = { dev: { aws_access_key_id: 'AKIA', aws_secret_access_key: 'secret' }, 'profile prod': { region: 'us-west-2' } };
+      const roundTripped = parseIni(stringifyIni(data));
+      expect(roundTripped).toEqual(data);
+    });
+
+    it('handles empty data object', {}, () => {
+      const result = stringifyIni({});
+      expect(result).toBe('\n');
+      expect(parseIni(result)).toEqual({});
+    });
+
+    it('handles section with no keys', {}, () => {
+      const result = stringifyIni({ dev: {} });
+      expect(result).toBe('[dev]\n');
+    });
+  });
+
+  describe('validateProfileName', {}, () => {
+    it('accepts valid profile names', {}, () => {
+      expect(() => validateProfileName('dev')).not.toThrow();
+      expect(() => validateProfileName('production')).not.toThrow();
+      expect(() => validateProfileName('my-profile-123')).not.toThrow();
+      expect(() => validateProfileName('default')).not.toThrow();
+    });
+
+    it('rejects empty profile names', {}, () => {
+      expect(() => validateProfileName('')).toThrow('aws-profile must not be empty');
+      expect(() => validateProfileName('   ')).toThrow('aws-profile must not be empty');
+    });
+
+    it('rejects profile names with whitespace', {}, () => {
+      expect(() => validateProfileName('my profile')).toThrow('aws-profile must not contain whitespace');
+      expect(() => validateProfileName('dev\ntest')).toThrow('aws-profile must not contain whitespace');
+      expect(() => validateProfileName('prod\tenv')).toThrow('aws-profile must not contain whitespace');
+    });
+
+    it('rejects profile names with brackets', {}, () => {
+      expect(() => validateProfileName('dev[test]')).toThrow('aws-profile must not contain brackets');
+      expect(() => validateProfileName('[profile]')).toThrow('aws-profile must not contain brackets');
+    });
+
+    it('rejects profile names with path separators', {}, () => {
+      expect(() => validateProfileName('dev/test')).toThrow('aws-profile must not contain path separators');
+      expect(() => validateProfileName('dev\\test')).toThrow('aws-profile must not contain path separators');
+      expect(() => validateProfileName('../etc/passwd')).toThrow('aws-profile must not contain path separators');
+    });
+  });
+
+  describe('getProfileFilePaths', {}, () => {
+    it('returns default paths when env vars not set', {}, () => {
+      delete process.env.AWS_SHARED_CREDENTIALS_FILE;
+      delete process.env.AWS_CONFIG_FILE;
+
+      const paths = getProfileFilePaths();
+
+      expect(paths.credentials).toMatch(/\.aws[/\\]credentials$/);
+      expect(paths.config).toMatch(/\.aws[/\\]config$/);
+    });
+
+    it('respects AWS_SHARED_CREDENTIALS_FILE env var', {}, () => {
+      process.env.AWS_SHARED_CREDENTIALS_FILE = '/custom/path/credentials';
+      process.env.AWS_CONFIG_FILE = '/custom/path/config';
+
+      const paths = getProfileFilePaths();
+
+      expect(paths.credentials).toBe('/custom/path/credentials');
+      expect(paths.config).toBe('/custom/path/config');
+    });
+  });
+
+  describe('ensureAwsDirectoryExists', {}, () => {
+    it('creates directory if it does not exist', {}, () => {
+      const filePath = '/home/runner/.aws/credentials';
+
+      ensureAwsDirectoryExists(filePath);
+
+      expect(fs.existsSync('/home/runner/.aws')).toBe(true);
+    });
+
+    it('does not error if directory already exists', {}, () => {
+      const filePath = '/home/runner/.aws/credentials';
+
+      fs.mkdirSync('/home/runner/.aws', { recursive: true });
+
+      expect(() => ensureAwsDirectoryExists(filePath)).not.toThrow();
+    });
+
+    it('creates nested directories', {}, () => {
+      const filePath = '/home/runner/custom/path/.aws/credentials';
+
+      ensureAwsDirectoryExists(filePath);
+
+      expect(fs.existsSync('/home/runner/custom/path/.aws')).toBe(true);
+    });
+  });
+
+  describe('mergeProfileSection', {}, () => {
+    it('creates new file with profile section', {}, () => {
+      const filePath = '/home/runner/.aws/credentials';
+      fs.mkdirSync('/home/runner/.aws', { recursive: true });
+
+      mergeProfileSection(filePath, 'dev', {
+        aws_access_key_id: 'AKIAIOSFODNN7EXAMPLE',
+        aws_secret_access_key: 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY',
+      }, false);
+
+      const content = fs.readFileSync(filePath, 'utf-8');
+      const parsed = parseIni(content);
+
+      expect(parsed.dev).toBeDefined();
+      expect(parsed.dev.aws_access_key_id).toBe('AKIAIOSFODNN7EXAMPLE');
+      expect(parsed.dev.aws_secret_access_key).toBe('wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY');
+    });
+
+    it('merges with existing profiles', {}, () => {
+      const filePath = '/home/runner/.aws/credentials';
+      fs.mkdirSync('/home/runner/.aws', { recursive: true });
+
+      // Create initial profile
+      mergeProfileSection(filePath, 'dev', {
+        aws_access_key_id: 'AKIAIOSFODNN7EXAMPLE',
+        aws_secret_access_key: 'devSecretKey',
+      }, false);
+
+      // Add second profile
+      mergeProfileSection(filePath, 'prod', {
+        aws_access_key_id: 'AKIAPRODEXAMPLE',
+        aws_secret_access_key: 'prodSecretKey',
+      }, false);
+
+      const content = fs.readFileSync(filePath, 'utf-8');
+      const parsed = parseIni(content);
+
+      expect(parsed.dev).toBeDefined();
+      expect(parsed.dev.aws_access_key_id).toBe('AKIAIOSFODNN7EXAMPLE');
+      expect(parsed.prod).toBeDefined();
+      expect(parsed.prod.aws_access_key_id).toBe('AKIAPRODEXAMPLE');
+    });
+
+    it('overwrites existing profile with same name', {}, () => {
+      const filePath = '/home/runner/.aws/credentials';
+      fs.mkdirSync('/home/runner/.aws', { recursive: true });
+
+      // Create initial profile
+      mergeProfileSection(filePath, 'dev', {
+        aws_access_key_id: 'OLD_KEY',
+        aws_secret_access_key: 'oldSecretKey',
+        aws_session_token: 'oldSessionToken'
+      }, false);
+
+      // Overwrite with new credentials
+      mergeProfileSection(filePath, 'dev', {
+        aws_access_key_id: 'NEW_KEY',
+        aws_secret_access_key: 'newSecretKey',
+        aws_session_token: 'newSessionToken',
+      }, true);
+
+      const content = fs.readFileSync(filePath, 'utf-8');
+      const parsed = parseIni(content);
+
+      expect(parsed.dev.aws_access_key_id).toBe('NEW_KEY');
+      expect(parsed.dev.aws_secret_access_key).toBe('newSecretKey');
+      expect(parsed.dev.aws_session_token).toBe('newSessionToken');
+    });
+
+    it('overwriting a profile removes stale keys', {}, () => {
+      const filePath = '/home/runner/.aws/credentials';
+      fs.mkdirSync('/home/runner/.aws', { recursive: true });
+
+      // Create profile with session token
+      mergeProfileSection(filePath, 'dev', {
+        aws_access_key_id: 'AKIA',
+        aws_secret_access_key: 'secret',
+        aws_session_token: 'old-token',
+      }, false);
+
+      // Overwrite without session token
+      mergeProfileSection(filePath, 'dev', {
+        aws_access_key_id: 'AKIA2',
+        aws_secret_access_key: 'secret2',
+      }, true);
+
+      const content = fs.readFileSync(filePath, 'utf-8');
+      const parsed = parseIni(content);
+
+      expect(parsed.dev.aws_access_key_id).toBe('AKIA2');
+      expect(parsed.dev.aws_secret_access_key).toBe('secret2');
+      expect(parsed.dev.aws_session_token).toBeUndefined();
+    });
+
+    it('handles empty existing file', {}, () => {
+      const filePath = '/home/runner/.aws/credentials';
+      fs.mkdirSync('/home/runner/.aws', { recursive: true });
+      fs.writeFileSync(filePath, '', { mode: 0o600 });
+
+      mergeProfileSection(filePath, 'dev', {
+        aws_access_key_id: 'AKIA',
+        aws_secret_access_key: 'secret',
+      }, false);
+
+      const content = fs.readFileSync(filePath, 'utf-8');
+      const parsed = parseIni(content);
+
+      expect(parsed.dev.aws_access_key_id).toBe('AKIA');
+      expect(parsed.dev.aws_secret_access_key).toBe('secret');
+    });
+
+    it('errors if profile name already exists but overwrite flag is false', {}, () => {
+      const filePath = '/home/runner/.aws/credentials';
+      fs.mkdirSync('/home/runner/.aws', { recursive: true });
+
+      // Create initial profile
+      mergeProfileSection(filePath, 'dev', {
+        aws_access_key_id: 'OLD_KEY',
+        aws_secret_access_key: 'oldSecretKey',
+      }, false);
+
+      // Overwrite with new credentials
+      expect(() => mergeProfileSection(filePath, 'dev', {
+        aws_access_key_id: 'NEW_KEY',
+        aws_secret_access_key: 'newSecretKey',
+        aws_session_token: 'sessionToken',
+      }, false)).toThrow(`Profile with name "dev" already exists. Please use the overwrite-aws-profile input if you want to overwrite existing profiles.`);
+
+      const content = fs.readFileSync(filePath, 'utf-8');
+      const parsed = parseIni(content);
+
+      expect(parsed.dev.aws_access_key_id).toBe('OLD_KEY');
+      expect(parsed.dev.aws_secret_access_key).toBe('oldSecretKey');
+      expect(parsed.dev.aws_session_token).toBeUndefined();
+    });
+  });
+
+  describe('writeProfileFiles', {}, () => {
+    beforeEach(() => {
+      delete process.env.AWS_SHARED_CREDENTIALS_FILE;
+      delete process.env.AWS_CONFIG_FILE;
+    });
+
+    it('writes credentials and config for new profile', {}, () => {
+      writeProfileFiles(
+        'dev',
+        {
+          AccessKeyId: 'AKIAIOSFODNN7EXAMPLE',
+          SecretAccessKey: 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY',
+          SessionToken: 'FwoGZXIvYXdzEBYaDEXAMPLE',
+        },
+        'us-east-1',
+        false,
+      );
+
+      // Check credentials file
+      const credsPath = getProfileFilePaths().credentials;
+      const credContent = fs.readFileSync(credsPath, 'utf-8');
+      const credParsed = parseIni(credContent);
+
+      expect(credParsed.dev).toBeDefined();
+      expect(credParsed.dev.aws_access_key_id).toBe('AKIAIOSFODNN7EXAMPLE');
+      expect(credParsed.dev.aws_secret_access_key).toBe('wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY');
+      expect(credParsed.dev.aws_session_token).toBe('FwoGZXIvYXdzEBYaDEXAMPLE');
+
+      // Check config file
+      const configPath = getProfileFilePaths().config;
+      const configContent = fs.readFileSync(configPath, 'utf-8');
+      const configParsed = parseIni(configContent);
+
+      expect(configParsed['profile dev']).toBeDefined();
+      expect(configParsed['profile dev'].region).toBe('us-east-1');
+    });
+
+    it('uses correct section naming for default profile', {}, () => {
+      writeProfileFiles(
+        'default',
+        {
+          AccessKeyId: 'AKIAIOSFODNN7EXAMPLE',
+          SecretAccessKey: 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY',
+        },
+        'us-west-2',
+        false,
+      );
+
+      // Check credentials file uses [default]
+      const credsPath = getProfileFilePaths().credentials;
+      const credContent = fs.readFileSync(credsPath, 'utf-8');
+      const credParsed = parseIni(credContent);
+
+      expect(credParsed.default).toBeDefined();
+      expect(credParsed['profile default']).toBeUndefined();
+
+      // Check config file uses [default] (not [profile default])
+      const configPath = getProfileFilePaths().config;
+      const configContent = fs.readFileSync(configPath, 'utf-8');
+      const configParsed = parseIni(configContent);
+
+      expect(configParsed.default).toBeDefined();
+      expect(configParsed['profile default']).toBeUndefined();
+    });
+
+    it('supports multiple profiles', {}, () => {
+      // Write first profile
+      writeProfileFiles(
+        'dev',
+        {
+          AccessKeyId: 'AKIADEV',
+          SecretAccessKey: 'devSecret',
+        },
+        'us-east-1',
+        false,
+      );
+
+      // Write second profile
+      writeProfileFiles(
+        'prod',
+        {
+          AccessKeyId: 'AKIAPROD',
+          SecretAccessKey: 'prodSecret',
+          SessionToken: 'prodToken',
+        },
+        'us-west-2',
+        false,
+      );
+
+      // Verify both profiles exist
+      const credsPath = getProfileFilePaths().credentials;
+      const credContent = fs.readFileSync(credsPath, 'utf-8');
+      const credParsed = parseIni(credContent);
+
+      expect(credParsed.dev).toBeDefined();
+      expect(credParsed.prod).toBeDefined();
+      expect(credParsed.dev.aws_access_key_id).toBe('AKIADEV');
+      expect(credParsed.prod.aws_access_key_id).toBe('AKIAPROD');
+    });
+
+    it('handles credentials without session token', {}, () => {
+      writeProfileFiles(
+        'dev',
+        {
+          AccessKeyId: 'AKIAIOSFODNN7EXAMPLE',
+          SecretAccessKey: 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY',
+        },
+        'us-east-1',
+        false,
+      );
+
+      const credsPath = getProfileFilePaths().credentials;
+      const credContent = fs.readFileSync(credsPath, 'utf-8');
+      const credParsed = parseIni(credContent);
+
+      expect(credParsed.dev.aws_access_key_id).toBe('AKIAIOSFODNN7EXAMPLE');
+      expect(credParsed.dev.aws_secret_access_key).toBe('wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY');
+      expect(credParsed.dev.aws_session_token).toBeUndefined();
+    });
+
+    it('throws error for invalid profile name', {}, () => {
+      expect(() =>
+        writeProfileFiles(
+          'invalid profile',
+          {
+            AccessKeyId: 'AKIA',
+            SecretAccessKey: 'secret',
+          },
+          'us-east-1',
+          false,
+        ),
+      ).toThrow('Failed to write AWS profile');
+      expect(() =>
+        writeProfileFiles(
+          'invalid profile',
+          {
+            AccessKeyId: 'AKIA',
+            SecretAccessKey: 'secret',
+          },
+          'us-east-1',
+          false
+        ),
+      ).toThrow('whitespace');
+    });
+
+    it('respects custom file paths from env vars', {}, () => {
+      process.env.AWS_SHARED_CREDENTIALS_FILE = '/custom/credentials';
+      process.env.AWS_CONFIG_FILE = '/custom/config';
+
+      fs.mkdirSync('/custom', { recursive: true });
+
+      writeProfileFiles(
+        'dev',
+        {
+          AccessKeyId: 'AKIA',
+          SecretAccessKey: 'secret',
+        },
+        'us-east-1',
+        false
+      );
+
+      expect(fs.existsSync('/custom/credentials')).toBe(true);
+      expect(fs.existsSync('/custom/config')).toBe(true);
+    });
+
+    it('logs info messages', {}, () => {
+      writeProfileFiles(
+        'dev',
+        {
+          AccessKeyId: 'AKIA',
+          SecretAccessKey: 'secret',
+        },
+        'us-east-1',
+        false
+      );
+
+      expect(core.info).toHaveBeenCalledWith('Writing credentials to profile: dev');
+      expect(core.info).toHaveBeenCalledWith('Writing config to profile: dev');
+      expect(core.info).toHaveBeenCalledWith('✓ Successfully configured AWS profile: dev');
+    });
+
+    it('preserves pre-existing unrelated profiles in credentials file', {}, () => {
+      const credsPath = getProfileFilePaths().credentials;
+      fs.mkdirSync(require('node:path').dirname(credsPath), { recursive: true });
+      fs.writeFileSync(
+        credsPath,
+        '[personal]\naws_access_key_id=AKIAPERSONAL\naws_secret_access_key=personalSecret\naws_session_token=personalToken\n',
+      );
+
+      writeProfileFiles(
+        'dev',
+        { AccessKeyId: 'AKIADEV', SecretAccessKey: 'devSecret' },
+        'us-east-1',
+        false,
+      );
+
+      const content = fs.readFileSync(credsPath, 'utf-8');
+      const parsed = parseIni(content);
+
+      // Pre-existing profile must be fully intact
+      expect(parsed.personal).toEqual({
+        aws_access_key_id: 'AKIAPERSONAL',
+        aws_secret_access_key: 'personalSecret',
+        aws_session_token: 'personalToken',
+      });
+      // New profile also present
+      expect(parsed.dev.aws_access_key_id).toBe('AKIADEV');
+    });
+
+    it('preserves pre-existing config with extra keys', {}, () => {
+      const configPath = getProfileFilePaths().config;
+      fs.mkdirSync(require('node:path').dirname(configPath), { recursive: true });
+      fs.writeFileSync(
+        configPath,
+        '[profile personal]\nregion=eu-west-1\noutput=json\ncli_pager=\n',
+      );
+
+      writeProfileFiles(
+        'dev',
+        { AccessKeyId: 'AKIA', SecretAccessKey: 'secret' },
+        'us-east-1',
+        false
+      );
+
+      const content = fs.readFileSync(configPath, 'utf-8');
+      const parsed = parseIni(content);
+
+      expect(parsed['profile personal']).toEqual({
+        region: 'eu-west-1',
+        output: 'json',
+        cli_pager: '',
+      });
+      expect(parsed['profile dev'].region).toBe('us-east-1');
+    });
+
+    it('preserves pre-existing default profile when writing a named profile', {}, () => {
+      const credsPath = getProfileFilePaths().credentials;
+      fs.mkdirSync(require('node:path').dirname(credsPath), { recursive: true });
+      fs.writeFileSync(
+        credsPath,
+        '[default]\naws_access_key_id=AKIADEFAULT\naws_secret_access_key=defaultSecret\n',
+      );
+
+      writeProfileFiles(
+        'dev',
+        { AccessKeyId: 'AKIADEV', SecretAccessKey: 'devSecret' },
+        'us-west-2',
+        false
+      );
+
+      const content = fs.readFileSync(credsPath, 'utf-8');
+      const parsed = parseIni(content);
+
+      expect(parsed.default).toEqual({
+        aws_access_key_id: 'AKIADEFAULT',
+        aws_secret_access_key: 'defaultSecret',
+      });
+      expect(parsed.dev.aws_access_key_id).toBe('AKIADEV');
+    });
+
+    it('comments in pre-existing files are stripped on round-trip', {}, () => {
+      const credsPath = getProfileFilePaths().credentials;
+      fs.mkdirSync(require('node:path').dirname(credsPath), { recursive: true });
+      fs.writeFileSync(
+        credsPath,
+        '# My important comment\n[personal]\naws_access_key_id=AKIA\naws_secret_access_key=secret\n',
+      );
+
+      writeProfileFiles(
+        'dev',
+        { AccessKeyId: 'AKIADEV', SecretAccessKey: 'devSecret' },
+        'us-east-1',
+        false
+      );
+
+      const content = fs.readFileSync(credsPath, 'utf-8') as string;
+
+      // Comment is lost (known trade-off), but profile data is preserved
+      expect(content).not.toContain('# My important comment');
+      const parsed = parseIni(content);
+      expect(parsed.personal.aws_access_key_id).toBe('AKIA');
+      expect(parsed.dev.aws_access_key_id).toBe('AKIADEV');
+    });
+
+    it('writes empty section when credentials object has no keys', {}, () => {
+      writeProfileFiles('dev', {}, 'us-east-1', false);
+
+      const credsPath = getProfileFilePaths().credentials;
+      const credContent = fs.readFileSync(credsPath, 'utf-8');
+      const credParsed = parseIni(credContent);
+
+      // Section exists but has no credential keys
+      expect(credParsed.dev).toEqual({});
+
+      // Config still gets region
+      const configPath = getProfileFilePaths().config;
+      const configContent = fs.readFileSync(configPath, 'utf-8');
+      const configParsed = parseIni(configContent);
+      expect(configParsed['profile dev'].region).toBe('us-east-1');
+    });
+
+    it('resolves credentials and config paths independently from env vars', {}, () => {
+      process.env.AWS_SHARED_CREDENTIALS_FILE = '/custom-creds/credentials';
+      // AWS_CONFIG_FILE is NOT set — should use default path
+
+      fs.mkdirSync('/custom-creds', { recursive: true });
+
+      writeProfileFiles(
+        'dev',
+        { AccessKeyId: 'AKIA', SecretAccessKey: 'secret' },
+        'us-east-1',
+        false
+      );
+
+      expect(fs.existsSync('/custom-creds/credentials')).toBe(true);
+      // Config file should be at the default path (under homedir)
+      const defaultConfigPath = require('node:path').join(require('node:os').homedir(), '.aws', 'config');
+      expect(fs.existsSync(defaultConfigPath)).toBe(true);
+    });
+
+    it('produces AWS CLI-compatible INI output (golden file)', {}, () => {
+      writeProfileFiles(
+        'dev',
+        {
+          AccessKeyId: 'AKIAIOSFODNN7EXAMPLE',
+          SecretAccessKey: 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY',
+          SessionToken: 'FwoGZXIvYXdzEBYaDEXAMPLE',
+        },
+        'us-east-1',
+        false
+      );
+
+      const credsPath = getProfileFilePaths().credentials;
+      const credContent = fs.readFileSync(credsPath, 'utf-8');
+
+      const configPath = getProfileFilePaths().config;
+      const configContent = fs.readFileSync(configPath, 'utf-8');
+
+      // Verify exact byte-for-byte format matching AWS CLI style:
+      // - [section] header on its own line
+      // - key = value with spaces around =
+      // - LF line endings, trailing newline
+      expect(credContent).toBe(
+        '[dev]\n' +
+        'aws_access_key_id = AKIAIOSFODNN7EXAMPLE\n' +
+        'aws_secret_access_key = wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY\n' +
+        'aws_session_token = FwoGZXIvYXdzEBYaDEXAMPLE\n',
+      );
+      expect(configContent).toBe(
+        '[profile dev]\n' +
+        'region = us-east-1\n',
+      );
+    });
+
+    it('golden file for multi-profile output', {}, () => {
+      writeProfileFiles(
+        'dev',
+        { AccessKeyId: 'AKIADEV', SecretAccessKey: 'devSecret' },
+        'us-east-1',
+        false
+      );
+      writeProfileFiles(
+        'prod',
+        { AccessKeyId: 'AKIAPROD', SecretAccessKey: 'prodSecret', SessionToken: 'prodToken' },
+        'us-west-2',
+        false
+      );
+
+      const credsPath = getProfileFilePaths().credentials;
+      const credContent = fs.readFileSync(credsPath, 'utf-8');
+
+      const configPath = getProfileFilePaths().config;
+      const configContent = fs.readFileSync(configPath, 'utf-8');
+
+      expect(credContent).toBe(
+        '[dev]\n' +
+        'aws_access_key_id = AKIADEV\n' +
+        'aws_secret_access_key = devSecret\n' +
+        '\n' +
+        '[prod]\n' +
+        'aws_access_key_id = AKIAPROD\n' +
+        'aws_secret_access_key = prodSecret\n' +
+        'aws_session_token = prodToken\n',
+      );
+      expect(configContent).toBe(
+        '[profile dev]\n' +
+        'region = us-east-1\n' +
+        '\n' +
+        '[profile prod]\n' +
+        'region = us-west-2\n',
+      );
+    });
+  });
+
+  describe('symlink hardening', {}, () => {
+    const credsPath = '/home/user/.aws/credentials';
+    const configPath = '/home/user/.aws/config';
+
+    beforeEach(() => {
+      process.env.AWS_SHARED_CREDENTIALS_FILE = credsPath;
+      process.env.AWS_CONFIG_FILE = configPath;
+    });
+
+    it('mergeProfileSection refuses when the credentials path is a symlink and leaves the target unchanged', {}, () => {
+      fs.mkdirSync('/home/user/.aws', { recursive: true });
+      fs.mkdirSync('/etc', { recursive: true });
+      fs.writeFileSync('/etc/passwd', 'root:x:0:0::/root:/bin/sh');
+      fs.symlinkSync('/etc/passwd', credsPath);
+
+      expect(() => mergeProfileSection(credsPath, 'dev', { aws_access_key_id: 'AKIA' }, true)).toThrow(
+        /Refusing .* \(.* symbolic link\)/,
+      );
+      expect(fs.readFileSync('/etc/passwd', 'utf-8')).toBe('root:x:0:0::/root:/bin/sh');
+    });
+
+    it('mergeProfileSection refuses when the config path is a symlink', {}, () => {
+      fs.mkdirSync('/home/user/.aws', { recursive: true });
+      fs.mkdirSync('/etc', { recursive: true });
+      fs.writeFileSync('/etc/sensitive', 'do not overwrite');
+      fs.symlinkSync('/etc/sensitive', configPath);
+
+      expect(() => mergeProfileSection(configPath, 'profile dev', { region: 'us-east-1' }, true)).toThrow(
+        /Refusing .* \(.* symbolic link\)/,
+      );
+      expect(fs.readFileSync('/etc/sensitive', 'utf-8')).toBe('do not overwrite');
+    });
+
+    it('ensureAwsDirectoryExists refuses when ~/.aws is a symlink', {}, () => {
+      fs.mkdirSync('/real-target', { recursive: true });
+      fs.mkdirSync('/home/user', { recursive: true });
+      fs.symlinkSync('/real-target', '/home/user/.aws');
+
+      expect(() => ensureAwsDirectoryExists(credsPath)).toThrow(/Refusing .* \(.* symbolic link\)/);
+    });
+
+    it('writeProfileFiles refuses to overwrite a pre-existing symlink at the credentials path', {}, () => {
+      fs.mkdirSync('/home/user/.aws', { recursive: true });
+      fs.mkdirSync('/etc', { recursive: true });
+      fs.writeFileSync('/etc/passwd', 'root:x:0:0::/root:/bin/sh');
+      fs.symlinkSync('/etc/passwd', credsPath);
+
+      expect(() =>
+        writeProfileFiles('dev', { AccessKeyId: 'AKIA', SecretAccessKey: 'secret' }, 'us-east-1', true),
+      ).toThrow(/Refusing .* \(.* symbolic link\)/);
+
+      expect(fs.lstatSync(credsPath).isSymbolicLink()).toBe(true);
+      expect(fs.readFileSync('/etc/passwd', 'utf-8')).toBe('root:x:0:0::/root:/bin/sh');
+    });
+
+    it('happy path still writes both files with mode 0o600 when no symlinks are present', {}, () => {
+      writeProfileFiles('dev', { AccessKeyId: 'AKIA', SecretAccessKey: 'secret' }, 'us-east-1', false);
+
+      expect(fs.statSync(credsPath).mode & 0o777).toBe(0o600);
+      expect(fs.statSync(configPath).mode & 0o777).toBe(0o600);
+      expect(fs.lstatSync(credsPath).isSymbolicLink()).toBe(false);
+      expect(fs.lstatSync(configPath).isSymbolicLink()).toBe(false);
+    });
+  });
+});

tsconfig.json

@@ -3,7 +3,7 @@
     "allowUnreachableCode": false,
     "allowUnusedLabels": false,
     "strict": true,
-    "exactOptionalPropertyTypes": false,
+    "exactOptionalPropertyTypes": true,
     "noFallthroughCasesInSwitch": true,
     "noImplicitOverride": true,
     "noImplicitReturns": true,
@@ -23,7 +23,8 @@
     "target": "ES2020",
     "noErrorTruncation": true,
     "esModuleInterop": true,
-    "rootDir": "src"
+    "rootDir": "src",
+    "skipLibCheck": true
   },
   "include": ["src/**/*.ts"],
   "exclude": ["test/**/*.ts"]