chore(release): 1.3.4

Bumps [@zeit/ncc](https://github.com/zeit/ncc) from 0.22.0 to 0.22.2.
- [Release notes](https://github.com/zeit/ncc/releases)
- [Commits](https://github.com/zeit/ncc/compare/0.22.0...0.22.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

.dependabot/config.yml

@@ -3,3 +3,7 @@ update_configs:
   - package_manager: "javascript"
     directory: "/"
     update_schedule: "monthly"
+    automerged_updates:
+      - match:
+          dependency_type: "all"
+          update_type: "semver:minor"

.mergify.yml

@@ -0,0 +1,32 @@
+pull_request_rules:
+  - name: Automatically merge on CI success and review approval
+    conditions:
+      - base~=master|integ-tests
+      - "#approved-reviews-by>=1"
+      - approved-reviews-by=@aws-actions/aws-ecs-devx
+      - -approved-reviews-by~=author
+      - status-success=Run Unit Tests
+      - status-success=Semantic Pull Request
+      - label!=work-in-progress
+      - -title~=(WIP|wip)
+      - -merged
+      - -closed
+      - author!=dependabot[bot]
+      - author!=dependabot-preview[bot]
+    actions:
+      merge:
+        method: squash
+        strict: smart
+        strict_method: merge
+
+  - name: Automatically approve Dependabot PRs
+    conditions:
+      - base=master
+      - author~=^dependabot(|-preview)\[bot\]$
+      - -title~=(WIP|wip)
+      - -label~=(blocked|do-not-merge)
+      - -merged
+      - -closed
+    actions:
+      review:
+        type: APPROVE

CHANGELOG.md

@@ -2,6 +2,45 @@
 
 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.
 
+### [1.3.4](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.3...v1.3.4) (2020-05-18)
+
+### [1.3.3](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.2...v1.3.3) (2020-04-02)
+
+### [1.3.2](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.1...v1.3.2) (2020-03-18)
+
+
+### Bug Fixes
+
+* let the AWS SDK determine the STS regional endpoint ([#48](https://github.com/aws-actions/configure-aws-credentials/issues/48)) ([fc72bd3](https://github.com/aws-actions/configure-aws-credentials/commit/fc72bd38dbe25493f5113760c9c6e1ef2f6f9a0e))
+
+### [1.3.1](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.0...v1.3.1) (2020-03-06)
+
+
+### Bug Fixes
+
+* validate region input string ([#44](https://github.com/aws-actions/configure-aws-credentials/issues/44)) ([3d568d2](https://github.com/aws-actions/configure-aws-credentials/commit/3d568d2c4359304d46d9bd1b4d9f69e088ccbf7b))
+
+## [1.3.0](https://github.com/aws-actions/configure-aws-credentials/compare/v1.2.0...v1.3.0) (2020-03-06)
+
+
+### Features
+
+* don't require access key credentials for self-hosted runners ([#42](https://github.com/aws-actions/configure-aws-credentials/issues/42)) ([a20ed60](https://github.com/aws-actions/configure-aws-credentials/commit/a20ed6025224ca999786c8d4e687f119cfedec65))
+
+## [1.2.0](https://github.com/aws-actions/configure-aws-credentials/compare/v1.1.2...v1.2.0) (2020-03-06)
+
+
+### Features
+
+* Add option to provide external ID ([#32](https://github.com/aws-actions/configure-aws-credentials/issues/32)) ([1c435bb](https://github.com/aws-actions/configure-aws-credentials/commit/1c435bbd5e1f1d36cdd703da5c4d6ee1ad91efac)), closes [#28](https://github.com/aws-actions/configure-aws-credentials/issues/28)
+* Have an ability to configure session name ([#29](https://github.com/aws-actions/configure-aws-credentials/issues/29)) ([4d0082a](https://github.com/aws-actions/configure-aws-credentials/commit/4d0082acf8b4102597f2570a056a320194f13e63))
+* infer role ARN if given role name ([#35](https://github.com/aws-actions/configure-aws-credentials/issues/35)) ([96c6f7e](https://github.com/aws-actions/configure-aws-credentials/commit/96c6f7e07b5fabc5a907fce84745ea625eeb005d))
+
+
+### Bug Fixes
+
+* mask both source and role credentials ([#40](https://github.com/aws-actions/configure-aws-credentials/issues/40)) ([816f5cc](https://github.com/aws-actions/configure-aws-credentials/commit/816f5cc0cf79541b2a6d639e8f93ae43aadaf09c))
+
 ### [1.1.2](https://github.com/aws-actions/configure-aws-credentials/compare/v1.1.1...v1.1.2) (2020-02-12)
 
 

README.md

@@ -2,6 +2,21 @@
 
 Configure AWS credential and region environment variables for use in other GitHub Actions.  The environment variables will be detected by both the AWS SDKs and the AWS CLI to determine the credentials and region to use for AWS API calls.
 
+**Table of Contents**
+
+<!-- toc -->
+
+- [Usage](#usage)
+- [Credentials](#credentials)
+- [Assuming a Role](#assuming-a-role)
+    + [Permissions for assuming a role](#permissions-for-assuming-a-role)
+    + [Session tagging](#session-tagging)
+- [Self-Hosted Runners](#self-hosted-runners)
+- [License Summary](#license-summary)
+- [Security Disclosures](#security-disclosures)
+
+<!-- tocstop -->
+
 ## Usage
 
 Add the following step to your workflow:
@@ -15,6 +30,30 @@ Add the following step to your workflow:
         aws-region: us-east-2
 ```
 
+For example, you can use this action with the AWS CLI available in [GitHub's hosted virtual environments](https://help.github.com/en/actions/reference/software-installed-on-github-hosted-runners).
+
+```yaml
+jobs:
+  deploy:
+    name: Upload to Amazon S3
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Configure AWS credentials
+      uses: aws-actions/configure-aws-credentials@v1
+      with:
+        aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
+        aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+        aws-region: us-east-2
+
+    - name: Copy files to S3 with the AWS CLI
+      run: |
+        aws s3 sync . s3://my-s3-website-bucket
+```
+
 See [action.yml](action.yml) for the full documentation for this action's inputs and outputs.
 
 ## Credentials
@@ -26,10 +65,11 @@ We recommend following [Amazon IAM best practices](https://docs.aws.amazon.com/I
 * [Rotate the credentials](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#rotate-credentials) used in GitHub Actions workflows regularly.
 * [Monitor the activity](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#keep-a-log) of the credentials used in GitHub Actions workflows.
 
-## Assuming a role
-If you would like to use the credentials you provide to this action to assume a role, you can do so by specifying the role ARN in `role-to-assume`.
-The role credentials will then be output instead of the ones you have provided.  
+## Assuming a Role
+If you would like to use the static credentials you provide to this action to assume a role, you can do so by specifying the role ARN in `role-to-assume`.
+The role credentials will then be configured in the Actions environment instead of the static credentials you have provided.
 The default session duration is 6 hours, but if you would like to adjust this you can pass a duration to `role-duration-seconds`.
+The default session name is GitHubActions, and you can modify it by specifying the desired name in `role-session-name`.
 
 Example:
 ```yaml
@@ -39,12 +79,58 @@ Example:
         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: arn:aws:iam::123456789100:role/role-to-assume
+        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`.
+
+### Permissions for assuming a role
+
+In order to assume a role, the IAM user for the static credentials must have the following permissions:
+```json
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Action": [
+                "sts:AssumeRole",
+                "sts:TagSession"
+            ],
+            "Resource": "arn:aws:iam::123456789012:role/my-github-actions-role",
+            "Effect": "Allow"
+        }
+    ]
+}
+```
+
+The role's trust policy must allow the IAM user to assume the role:
+```json
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Sid": "AllowIamUserAssumeRole",
+            "Effect": "Allow",
+            "Action": "sts:AssumeRole",
+            "Principal": {"AWS": "arn:aws:iam::123456789012:user/my-github-actions-user"},
+            "Condition": {
+                "StringEquals": {"sts:ExternalId": "Example987"}
+            }
+        },
+        {
+            "Sid": "AllowPassSessionTags",
+            "Effect": "Allow",
+            "Action": "sts:TagSession",
+            "Principal": {"AWS": "arn:aws:iam::123456789012:user/my-github-actions-user"}
+        }
+    ]
+}
 ```
 
 ### Session tagging
-The session will have the name "GitHubActions" and be tagged with the following tags:  
+The session will have the name "GitHubActions" and be tagged with the following tags:
 (`GITHUB_` environment variable definitions can be [found here](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/using-environment-variables#default-environment-variables))
 
 | Key | Value|
@@ -59,6 +145,33 @@ The session will have the name "GitHubActions" and be tagged with the following
 
 _Note: all tag values must conform to [the 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 charcters, the characters will be replaced with an '*'._
 
+## Self-Hosted Runners
+
+If you run your GitHub Actions in a [self-hosted runner](https://help.github.com/en/actions/hosting-your-own-runners/about-self-hosted-runners) that already has access to AWS credentials, such as an EC2 instance, then you do not need to provide IAM user access key credentials to this action.
+
+If no access key credentials are given in the action inputs, this action will use credentials from the runner environment using the [default methods for the AWS SDK for Javascript](https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/setting-credentials-node.html).
+
+You can use this action to simply configure the region and account ID in the environment, and then use the runner's credentials for all AWS API calls made by your Actions workflow:
+```yaml
+uses: aws-actions/configure-aws-credentials@v1
+with:
+  aws-region: us-east-2
+```
+In this case, your runner's credentials must have permissions to call any AWS APIs called by your Actions workflow.
+
+Or, you can use this action to assume a role, and then use the role credentials for all AWS API calls made by your Actions workflow:
+```yaml
+uses: aws-actions/configure-aws-credentials@v1
+with:
+  aws-region: us-east-2
+  role-to-assume: my-github-actions-role
+```
+In this case, your runner's credentials must have permissions to assume the role.
+
 ## License Summary
 
 This code is made available under the MIT license.
+
+## 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 directly](mailto:aws-security@amazon.com).

action.yml

@@ -5,11 +5,17 @@ branding:
   color: 'orange'
 inputs:
   aws-access-key-id:
-    description: 'AWS Access Key ID'
-    required: true
+    description: >-
+      AWS Access Key ID. This input is required if running in the GitHub hosted environment.
+      It is optional if running in a self-hosted environment that already has AWS credentials,
+      for example on an EC2 instance.
+    required: false
   aws-secret-access-key:
-    description: 'AWS Secret Access Key'
-    required: true
+    description: >-
+      AWS Secret Access Key. This input is required if running in the GitHub hosted environment.
+      It is optional if running in a self-hosted environment that already has AWS credentials,
+      for example on an EC2 instance.
+    required: false
   aws-session-token:
     description: 'AWS Session Token'
     required: false
@@ -17,14 +23,26 @@ inputs:
     description: 'AWS Region, e.g. us-east-2'
     required: true
   mask-aws-account-id:
-    description: "Whether to set the AWS account ID for these credentials as a secret value, so that it is masked in logs. Valid values are 'true' and 'false'. Defaults to true"
+    description: >-
+      Whether to set the AWS account ID for these credentials as a secret value,
+      so that it is masked in logs. Valid values are 'true' and 'false'.
+      Defaults to true
     required: false
   role-to-assume:
-    description: "Use the provided credentials to assume a Role and output the assumed credentials for that Role rather than the provided credentials"
+    description: >-
+      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
   role-duration-seconds:
     description: "Role duration in seconds (default: 6 hours)"
     required: false
+  role-session-name:
+    description: 'Role session name (default: GitHubActions)'
+    required: false
+  role-external-id:
+    description: 'The external ID of the role to assume'
+    required: false
 outputs:
   aws-account-id:
     description: 'The AWS account ID for the provided credentials'

index.js

@@ -1,22 +1,30 @@
 const core = require('@actions/core');
 const aws = require('aws-sdk');
 const assert = require('assert');
-const util = require('util');
 
 // The max time that a GitHub action is allowed to run is 6 hours.
 // That seems like a reasonable default to use if no role duration is defined.
 const MAX_ACTION_RUNTIME = 6 * 3600;
 const USER_AGENT = 'configure-aws-credentials-for-github-actions';
 const MAX_TAG_VALUE_LENGTH = 256;
-const SANITIZATION_CHARACTER = '_'
+const SANITIZATION_CHARACTER = '_';
+const ROLE_SESSION_NAME = 'GitHubActions';
+const REGION_REGEX = /^[a-z0-9-]+$/g;
 
 async function assumeRole(params) {
   // Assume a role to get short-lived credentials using longer-lived credentials.
   const isDefined = i => !!i;
 
-  const {roleToAssume, roleDurationSeconds, accessKeyId, secretAccessKey, sessionToken, region} = params;
+  const {
+    sourceAccountId,
+    roleToAssume,
+    roleExternalId,
+    roleDurationSeconds,
+    roleSessionName,
+    region,
+  } = params;
   assert(
-      [roleToAssume, roleDurationSeconds, accessKeyId, secretAccessKey, region].every(isDefined),
+      [sourceAccountId, roleToAssume, roleDurationSeconds, roleSessionName, region].every(isDefined),
       "Missing required input when assuming a Role."
   );
 
@@ -26,14 +34,17 @@ async function assumeRole(params) {
       'Missing required environment value. Are you running in GitHub Actions?'
   );
 
-  const endpoint = util.format('https://sts.%s.amazonaws.com', region);
+  const sts = getStsClient(region);
 
-  const sts = new aws.STS({
-    accessKeyId, secretAccessKey, sessionToken, region, endpoint, customUserAgent: USER_AGENT
-  });
-  return sts.assumeRole({
-    RoleArn: roleToAssume,
-    RoleSessionName: 'GitHubActions',
+  let roleArn = roleToAssume;
+  if (!roleArn.startsWith('arn:aws')) {
+    // Supports only 'aws' partition. Customers in other partitions ('aws-cn') will need to provide full ARN
+    roleArn = `arn:aws:iam::${sourceAccountId}:role/${roleArn}`;
+  }
+
+  const assumeRoleRequest = {
+    RoleArn: roleArn,
+    RoleSessionName: roleSessionName,
     DurationSeconds: roleDurationSeconds,
     Tags: [
       {Key: 'GitHub', Value: 'Actions'},
@@ -44,7 +55,13 @@ async function assumeRole(params) {
       {Key: 'Branch', Value: GITHUB_REF},
       {Key: 'Commit', Value: GITHUB_SHA},
     ]
-  })
+  };
+
+  if (roleExternalId) {
+    assumeRoleRequest.ExternalId = roleExternalId;
+  }
+
+  return sts.assumeRole(assumeRoleRequest)
   .promise()
   .then(function (data) {
     return {
@@ -100,41 +117,73 @@ function exportRegion(region) {
   core.exportVariable('AWS_REGION', region);
 }
 
-async function exportAccountId(maskAccountId) {
+async function exportAccountId(maskAccountId, region) {
   // Get the AWS account ID
-  const sts = new aws.STS({customUserAgent: USER_AGENT});
+  const sts = getStsClient(region);
   const identity = await sts.getCallerIdentity().promise();
   const accountId = identity.Account;
   core.setOutput('aws-account-id', accountId);
   if (!maskAccountId || maskAccountId.toLowerCase() == 'true') {
     core.setSecret(accountId);
   }
+  return accountId;
+}
+
+function getStsClient(region) {
+  return new aws.STS({
+    region,
+    stsRegionalEndpoints: 'regional',
+    customUserAgent: USER_AGENT
+  });
 }
 
 async function run() {
   try {
     // Get inputs
-    const accessKeyId = core.getInput('aws-access-key-id', { required: true });
-    const secretAccessKey = core.getInput('aws-secret-access-key', { required: true });
+    const accessKeyId = core.getInput('aws-access-key-id', { required: false });
+    const secretAccessKey = core.getInput('aws-secret-access-key', { required: false });
     const region = core.getInput('aws-region', { required: true });
     const sessionToken = core.getInput('aws-session-token', { required: false });
     const maskAccountId = core.getInput('mask-aws-account-id', { required: false });
     const roleToAssume = core.getInput('role-to-assume', {required: false});
+    const roleExternalId = core.getInput('role-external-id', { required: false });
     const roleDurationSeconds = core.getInput('role-duration-seconds', {required: false}) || MAX_ACTION_RUNTIME;
+    const roleSessionName = core.getInput('role-session-name', { required: false }) || ROLE_SESSION_NAME;
 
-    // Get role credentials if configured to do so
-    if (roleToAssume) {
-      const roleCredentials = await assumeRole(
-          {accessKeyId, secretAccessKey, sessionToken, region, roleToAssume, roleDurationSeconds}
-      );
-      exportCredentials(roleCredentials);
-    } else {
-      exportCredentials({accessKeyId, secretAccessKey, sessionToken});
+    if (!region.match(REGION_REGEX)) {
+      throw new Error(`Region is not valid: ${region}`);
     }
 
     exportRegion(region);
 
-    await exportAccountId(maskAccountId);
+    // Always export the source credentials and account ID.
+    // The STS client for calling AssumeRole pulls creds from the environment.
+    // Plus, in the assume role case, if the AssumeRole call fails, we want
+    // the source credentials and accound ID to already be masked as secrets
+    // in any error messages.
+    if (accessKeyId) {
+      if (!secretAccessKey) {
+        throw new Error("'aws-secret-access-key' must be provided if 'aws-access-key-id' is provided");
+      }
+
+      exportCredentials({accessKeyId, secretAccessKey, sessionToken});
+    }
+
+    const sourceAccountId = await exportAccountId(maskAccountId, region);
+
+    // Get role credentials if configured to do so
+    if (roleToAssume) {
+      const roleCredentials = await assumeRole({
+        sourceAccountId,
+        region,
+        roleToAssume,
+        roleExternalId,
+        roleDurationSeconds,
+        roleSessionName
+      });
+      exportCredentials(roleCredentials);
+      await exportAccountId(maskAccountId, region);
+    }
   }
   catch (error) {
     core.setFailed(error.message);

index.test.js

@@ -13,7 +13,9 @@ const FAKE_STS_SECRET_ACCESS_KEY = 'STS-AWS-SECRET-ACCESS-KEY';
 const FAKE_STS_SESSION_TOKEN = 'STS-AWS-SESSION-TOKEN';
 const FAKE_REGION = 'fake-region-1';
 const FAKE_ACCOUNT_ID = '123456789012';
+const FAKE_ROLE_ACCOUNT_ID = '111111111111';
 const ROLE_NAME = 'MY-ROLE';
+const ROLE_ARN = 'arn:aws:iam::111111111111:role/MY-ROLE';
 const ENVIRONMENT_VARIABLE_OVERRIDES = {
     SHOW_STACK_TRACE: 'true',
     GITHUB_REPOSITORY: 'MY-REPOSITORY-NAME',
@@ -30,17 +32,17 @@ function mockGetInput(requestResponse) {
         return requestResponse[name]
     }
 }
-const REQUIRED_INPUTS = {
+const CREDS_INPUTS = {
     'aws-access-key-id': FAKE_ACCESS_KEY_ID,
     'aws-secret-access-key': FAKE_SECRET_ACCESS_KEY
 };
 const DEFAULT_INPUTS = {
-    ...REQUIRED_INPUTS,
+    ...CREDS_INPUTS,
     'aws-session-token': FAKE_SESSION_TOKEN,
     'aws-region': FAKE_REGION,
     'mask-aws-account-id': 'TRUE'
 };
-const ASSUME_ROLE_INPUTS = {...REQUIRED_INPUTS, 'role-to-assume': ROLE_NAME, 'aws-region': FAKE_REGION};
+const ASSUME_ROLE_INPUTS = {...CREDS_INPUTS, 'role-to-assume': ROLE_ARN, 'aws-region': FAKE_REGION};
 
 const mockStsCallerIdentity = jest.fn();
 const mockStsAssumeRole = jest.fn();
@@ -67,13 +69,18 @@ describe('Configure AWS Credentials', () => {
             .fn()
             .mockImplementation(mockGetInput(DEFAULT_INPUTS));
 
-        mockStsCallerIdentity.mockImplementation(() => {
-            return {
+        mockStsCallerIdentity.mockReset();
+        mockStsCallerIdentity
+            .mockReturnValueOnce({
                 promise() {
                    return Promise.resolve({ Account: FAKE_ACCOUNT_ID });
                 }
-            };
-        });
+            })
+            .mockReturnValueOnce({
+                promise() {
+                   return Promise.resolve({ Account: FAKE_ROLE_ACCOUNT_ID });
+                }
+            });
 
         mockStsAssumeRole.mockImplementation(() => {
             return {
@@ -111,8 +118,24 @@ describe('Configure AWS Credentials', () => {
         expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCOUNT_ID);
     });
 
+    test('hosted runners can pull creds from a self-hosted environment', async () => {
+        const mockInputs = {'aws-region': FAKE_REGION};
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(mockInputs));
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledTimes(0);
+        expect(core.exportVariable).toHaveBeenCalledTimes(2);
+        expect(core.setSecret).toHaveBeenCalledTimes(1);
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', FAKE_REGION);
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_REGION', FAKE_REGION);
+        expect(core.setOutput).toHaveBeenCalledWith('aws-account-id', FAKE_ACCOUNT_ID);
+        expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCOUNT_ID);
+    });
+
     test('session token is optional', async () => {
-        const mockInputs = {...REQUIRED_INPUTS, 'aws-region': 'eu-west-1'};
+        const mockInputs = {...CREDS_INPUTS, 'aws-region': 'eu-west-1'};
         core.getInput = jest
             .fn()
             .mockImplementation(mockGetInput(mockInputs));
@@ -131,8 +154,21 @@ describe('Configure AWS Credentials', () => {
         expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCOUNT_ID);
     });
 
+    test('validates region name', async () => {
+        process.env.SHOW_STACK_TRACE = 'false';
+
+        const mockInputs = {...CREDS_INPUTS, 'aws-region': '$AWS_REGION'};
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(mockInputs));
+
+        await run();
+
+        expect(core.setFailed).toHaveBeenCalledWith('Region is not valid: $AWS_REGION');
+    });
+
     test('can opt out of masking account ID', async () => {
-        const mockInputs = {...REQUIRED_INPUTS, 'aws-region': 'us-east-1', 'mask-aws-account-id': 'false'};
+        const mockInputs = {...CREDS_INPUTS, 'aws-region': 'us-east-1', 'mask-aws-account-id': 'false'};
         core.getInput = jest
             .fn()
             .mockImplementation(mockGetInput(mockInputs));
@@ -153,6 +189,7 @@ describe('Configure AWS Credentials', () => {
     test('error is caught by core.setFailed and caught', async () => {
         process.env.SHOW_STACK_TRACE = 'false';
 
+        mockStsCallerIdentity.mockReset();
         mockStsCallerIdentity.mockImplementation(() => {
             throw new Error();
         });
@@ -164,6 +201,7 @@ describe('Configure AWS Credentials', () => {
 
     test('error is caught by core.setFailed and passed', async () => {
 
+        mockStsCallerIdentity.mockReset();
         mockStsCallerIdentity.mockImplementation(() => {
             throw new Error();
         });
@@ -178,20 +216,65 @@ describe('Configure AWS Credentials', () => {
             .fn()
             .mockImplementation(mockGetInput(ASSUME_ROLE_INPUTS));
 
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledTimes(1);
+        expect(core.exportVariable).toHaveBeenCalledTimes(7);
+        expect(core.setSecret).toHaveBeenCalledTimes(7);
+        expect(core.setOutput).toHaveBeenCalledTimes(2);
+
+        // first the source credentials are exported and masked
+        expect(core.setSecret).toHaveBeenNthCalledWith(1, FAKE_ACCESS_KEY_ID);
+        expect(core.setSecret).toHaveBeenNthCalledWith(2, FAKE_SECRET_ACCESS_KEY);
+        expect(core.setSecret).toHaveBeenNthCalledWith(3, FAKE_ACCOUNT_ID);
+
+        expect(core.exportVariable).toHaveBeenNthCalledWith(1, 'AWS_DEFAULT_REGION', FAKE_REGION);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(2, 'AWS_REGION', FAKE_REGION);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(3, 'AWS_ACCESS_KEY_ID', FAKE_ACCESS_KEY_ID);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(4, 'AWS_SECRET_ACCESS_KEY', FAKE_SECRET_ACCESS_KEY);
+
+        expect(core.setOutput).toHaveBeenNthCalledWith(1, 'aws-account-id', FAKE_ACCOUNT_ID);
+
+        // then the role credentials are exported and masked
+        expect(core.setSecret).toHaveBeenNthCalledWith(4, FAKE_STS_ACCESS_KEY_ID);
+        expect(core.setSecret).toHaveBeenNthCalledWith(5, FAKE_STS_SECRET_ACCESS_KEY);
+        expect(core.setSecret).toHaveBeenNthCalledWith(6, FAKE_STS_SESSION_TOKEN);
+        expect(core.setSecret).toHaveBeenNthCalledWith(7, FAKE_ROLE_ACCOUNT_ID);
+
+        expect(core.exportVariable).toHaveBeenNthCalledWith(5, 'AWS_ACCESS_KEY_ID', FAKE_STS_ACCESS_KEY_ID);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(6, 'AWS_SECRET_ACCESS_KEY', FAKE_STS_SECRET_ACCESS_KEY);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(7, 'AWS_SESSION_TOKEN', FAKE_STS_SESSION_TOKEN);
+
+        expect(core.setOutput).toHaveBeenNthCalledWith(2, 'aws-account-id', FAKE_ROLE_ACCOUNT_ID);
+    });
+
+    test('assume role can pull source credentials from self-hosted environment', async () => {
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput({'role-to-assume': ROLE_ARN, 'aws-region': FAKE_REGION}));
+
         await run();
         expect(mockStsAssumeRole).toHaveBeenCalledTimes(1);
         expect(core.exportVariable).toHaveBeenCalledTimes(5);
-        expect(core.setSecret).toHaveBeenCalledTimes(4);
-        expect(core.exportVariable).toHaveBeenCalledWith('AWS_ACCESS_KEY_ID', FAKE_STS_ACCESS_KEY_ID);
-        expect(core.setSecret).toHaveBeenCalledWith(FAKE_STS_ACCESS_KEY_ID);
-        expect(core.exportVariable).toHaveBeenCalledWith('AWS_SECRET_ACCESS_KEY', FAKE_STS_SECRET_ACCESS_KEY);
-        expect(core.setSecret).toHaveBeenCalledWith(FAKE_STS_SECRET_ACCESS_KEY);
-        expect(core.exportVariable).toHaveBeenCalledWith('AWS_SESSION_TOKEN', FAKE_STS_SESSION_TOKEN);
-        expect(core.setSecret).toHaveBeenCalledWith(FAKE_STS_SESSION_TOKEN);
-        expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', FAKE_REGION);
-        expect(core.exportVariable).toHaveBeenCalledWith('AWS_REGION', FAKE_REGION);
-        expect(core.setOutput).toHaveBeenCalledWith('aws-account-id', FAKE_ACCOUNT_ID);
-        expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCOUNT_ID);
+        expect(core.setSecret).toHaveBeenCalledTimes(5);
+        expect(core.setOutput).toHaveBeenCalledTimes(2);
+
+        // first the source account is exported and masked
+        expect(core.setSecret).toHaveBeenNthCalledWith(1, FAKE_ACCOUNT_ID);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(1, 'AWS_DEFAULT_REGION', FAKE_REGION);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(2, 'AWS_REGION', FAKE_REGION);
+        expect(core.setOutput).toHaveBeenNthCalledWith(1, 'aws-account-id', FAKE_ACCOUNT_ID);
+
+        // then the role credentials are exported and masked
+        expect(core.setSecret).toHaveBeenNthCalledWith(2, FAKE_STS_ACCESS_KEY_ID);
+        expect(core.setSecret).toHaveBeenNthCalledWith(3, FAKE_STS_SECRET_ACCESS_KEY);
+        expect(core.setSecret).toHaveBeenNthCalledWith(4, FAKE_STS_SESSION_TOKEN);
+        expect(core.setSecret).toHaveBeenNthCalledWith(5, FAKE_ROLE_ACCOUNT_ID);
+
+        expect(core.exportVariable).toHaveBeenNthCalledWith(3, 'AWS_ACCESS_KEY_ID', FAKE_STS_ACCESS_KEY_ID);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(4, 'AWS_SECRET_ACCESS_KEY', FAKE_STS_SECRET_ACCESS_KEY);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(5, 'AWS_SESSION_TOKEN', FAKE_STS_SESSION_TOKEN);
+
+        expect(core.setOutput).toHaveBeenNthCalledWith(2, 'aws-account-id', FAKE_ROLE_ACCOUNT_ID);
     });
 
     test('role assumption tags', async () => {
@@ -201,7 +284,7 @@ describe('Configure AWS Credentials', () => {
 
         await run();
         expect(mockStsAssumeRole).toHaveBeenCalledWith({
-            RoleArn: ROLE_NAME,
+            RoleArn: ROLE_ARN,
             RoleSessionName: 'GitHubActions',
             DurationSeconds: 6 * 3600,
             Tags: [
@@ -223,7 +306,7 @@ describe('Configure AWS Credentials', () => {
 
         await run();
         expect(mockStsAssumeRole).toHaveBeenCalledWith({
-            RoleArn: ROLE_NAME,
+            RoleArn: ROLE_ARN,
             RoleSessionName: 'GitHubActions',
             DurationSeconds: 5,
             Tags: [
@@ -238,18 +321,85 @@ describe('Configure AWS Credentials', () => {
         })
     });
 
+    test('role assumption session name provided', async () => {
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput({...ASSUME_ROLE_INPUTS, 'role-session-name': 'MySessionName'}));
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledWith({
+            RoleArn: ROLE_ARN,
+            RoleSessionName: 'MySessionName',
+            DurationSeconds: 6 * 3600,
+            Tags: [
+                {Key: 'GitHub', Value: 'Actions'},
+                {Key: 'Repository', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REPOSITORY},
+                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
+                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
+                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
+                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+            ]
+        })
+    });
+
+    test('role name provided instead of ARN', async () => {
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput({...CREDS_INPUTS, 'role-to-assume': ROLE_NAME, 'aws-region': FAKE_REGION}));
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledWith({
+            RoleArn: 'arn:aws:iam::123456789012:role/MY-ROLE',
+            RoleSessionName: 'GitHubActions',
+            DurationSeconds: 6 * 3600,
+            Tags: [
+                {Key: 'GitHub', Value: 'Actions'},
+                {Key: 'Repository', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REPOSITORY},
+                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
+                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
+                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
+                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+            ]
+        })
+    });
+
+    test('role external ID provided', async () => {
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput({...ASSUME_ROLE_INPUTS, 'role-external-id': 'abcdef'}));
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledWith({
+            RoleArn: ROLE_ARN,
+            RoleSessionName: 'GitHubActions',
+            DurationSeconds: 6 * 3600,
+            Tags: [
+                {Key: 'GitHub', Value: 'Actions'},
+                {Key: 'Repository', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REPOSITORY},
+                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
+                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
+                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
+                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+            ],
+            ExternalId: 'abcdef'
+        })
+    });
+
     test('workflow name sanitized in role assumption tags', async () => {
         core.getInput = jest
             .fn()
             .mockImplementation(mockGetInput(ASSUME_ROLE_INPUTS));
-        
+
         process.env = {...process.env, GITHUB_WORKFLOW: 'Workflow!"#$%&\'()*+, -./:;<=>?@[]^_`{|}~🙂💥🍌1yFvMOeD3ZHYsHrGjCceOboMYzBPo0CRNFdcsVRG6UgR3A912a8KfcBtEVvkAS7kRBq80umGff8mux5IN1y55HQWPNBNyaruuVr4islFXte4FDQZexGJRUSMyHQpxJ8OmZnET84oDmbvmIjgxI6IBrdihX9PHMapT4gQvRYnLqNiKb18rEMWDNoZRy51UPX5sWK2GKPipgKSO9kqLckZai9D2AN2RlWCxtMqChNtxuxjqeqhoQZo0oaq39sjcRZgAAAAAAA'};
 
         const sanitizedWorkflowName = 'Workflow__________+, -./:;<=>?@____________1yFvMOeD3ZHYsHrGjCceOboMYzBPo0CRNFdcsVRG6UgR3A912a8KfcBtEVvkAS7kRBq80umGff8mux5IN1y55HQWPNBNyaruuVr4islFXte4FDQZexGJRUSMyHQpxJ8OmZnET84oDmbvmIjgxI6IBrdihX9PHMapT4gQvRYnLqNiKb18rEMWDNoZRy51UPX5sWK2GKPipgKSO9kqLckZa'
 
         await run();
         expect(mockStsAssumeRole).toHaveBeenCalledWith({
-            RoleArn: ROLE_NAME,
+            RoleArn: ROLE_ARN,
             RoleSessionName: 'GitHubActions',
             DurationSeconds: 6 * 3600,
             Tags: [

package.json

@@ -1,6 +1,6 @@
 {
   "name": "aws-actions-configure-aws-credentials",
-  "version": "1.1.2",
+  "version": "1.3.4",
   "description": "Configure AWS Credentials",
   "main": "index.js",
   "scripts": {
@@ -25,12 +25,12 @@
   },
   "homepage": "https://github.com/aws-actions/configure-aws-credentials#readme",
   "dependencies": {
-    "@actions/core": "^1.2.2",
-    "aws-sdk": "^2.613.0"
+    "@actions/core": "^1.2.4",
+    "aws-sdk": "^2.679.0"
   },
   "devDependencies": {
-    "@zeit/ncc": "^0.21.0",
-    "eslint": "^6.8.0",
-    "jest": "^25.1.0"
+    "@zeit/ncc": "^0.22.2",
+    "eslint": "^7.0.0",
+    "jest": "^26.0.1"
   }
 }