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https://github.com/aws-actions/configure-aws-credentials

Configure AWS credential environment variables for use in other GitHub Actions.
https://github.com/aws-actions/configure-aws-credentials

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Configure AWS credential environment variables for use in other GitHub Actions.

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## Configure AWS Credentials for GitHub Actions

Configure your AWS credentials and region environment variables for use in other

GitHub Actions.



This action implements the AWS JavaScript SDK credential resolution chain

and exports session environment variables for your other Actions to use.

Environment variable exports are detected by both the AWS SDKs and the AWS CLI

for AWS API calls.



## Overview

API calls to AWS need to be signed with credential information, so when you use

one of the AWS SDKs or an AWS tool, you must provide it with AWS credentials and

and AWS region. One way to do that in GitHub Actions is to use a repository

secret with IAM credentials, but this doesn't follow [AWS security

guidelines](https://docs.aws.amazon.com/IAM/latest/UserGuide/security-creds.html)

on using long term credentials. Instead, we recommend that you use a long term

credential or JWT to fetch a temporary credential, and use that with your tools

instead. This GitHub Action facilitates just that.



AWS SDKs and Tools look for your credentials in standardized environment

variables. In essence, this Action runs through the standard [credential

resolution flow](https://docs.aws.amazon.com/sdkref/latest/guide/standardized-credentials.html),

and at the end, exports environment variables for you to use later.



We support five methods for fetching credentials from AWS, but we recommend that

you use GitHub's OIDC provider in conjunction with a configured AWS IAM

Identity Provider endpoint.



For more information on how to do that, read on.



### Note about GHES



Some of this documentation may be inaccurate if you are using GHES (GitHub

Enterprise Server), please take note to review the GitHub documentation when

relevant.



For example, the URL that the OIDC JWT is issued from is different than the

usual `token.actions.githubusercontent.com`, and will be unique to your

enterprise server. As a result, you will need to configure this differently when

you create the Identity Provider.



We do not presently have a GHES testing environment to validate this action. If

you are running in GHES and encounter problems, please

[let us know](https://github.com/aws-actions/configure-aws-credentials/issues/new/choose).



## Security recommendations



We recommend following

[Amazon IAM best practices](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html)

for the AWS credentials used in GitHub Actions workflows, including:

  * Do not store credentials in your repository's code.

  * [Grant least privilege](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege)

  to the credentials used in GitHub Actions workflows. Grant only the

  permissions required to perform the actions in your GitHub Actions workflows.

  Do not assume overly permissive roles, even for testing.

  * [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.

  * Use temporary credentials when possible.

  * Periodically rotate any long-term credentials you use.



## Using this action

There are five different supported ways to retrieve credentials:



- Using GitHub's OIDC provider (`AssumeRoleWithWebIdentity`)

- Proceeding as an IAM user (No STS call is made)

- Using access keys as action input (`AssumeRole`)

- Using a WebIdentity Token File (`AssumeRoleWithWebIdentity`)

- Using existing credentials in your runner (`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).

Depending on your inputs, the action might override parts of this flow.



We recommend using the first option above: [GitHub's OIDC provider](https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/configuring-openid-connect-in-amazon-web-services).

This method uses OIDC to get short-lived credentials needed for your actions.

See [OIDC](#OIDC) for more information on how to setup your AWS account to

assume a role with OIDC. 



The following table describes which method we'll use to get your credentials

based on which values are supplied to the Action:



| **Identity Used**                                               | `aws-access-key-id` | `role-to-assume` | `web-identity-token-file` | `role-chaining` | `id-token` permission

| --------------------------------------------------------------- | ------------------- | ---------------- | ------------------------- | - | - |

| [✅ Recommended] Assume Role directly using GitHub OIDC provider |                     | ✔                |                           | | ✔ |

| IAM User                                                        | ✔                   |                  |                           | | |

| Assume Role using IAM User credentials                          | ✔                   | ✔                |                           | | |

| Assume Role using WebIdentity Token File credentials            |                     | ✔                | ✔                         | | |

| Assume Role 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.*



### Options

See [action.yml](./action.yml) for more detail.



|          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.                     |    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. Defaults to false.                   |    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 |



#### Credential Lifetime

The default session duration is **1 hour**.



If you would like to adjust this you can pass a duration to

`role-duration-seconds`, but the duration cannot exceed the maximum that was

defined when the IAM Role was created.



#### External ID

If your role requires an external ID to assume, you can provide the external ID

with the `role-external-id` input



#### Session tagging and name

The default session name is "GitHubActions", and you can modify it by specifying

the desired name in `role-session-name`. 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))



| Key        | Value             |

| ---------- | ----------------- |

| GitHub     | "Actions"         |

| Repository | GITHUB_REPOSITORY |

| Workflow   | GITHUB_WORKFLOW   |

| Action     | GITHUB_ACTION     |

| Actor      | GITHUB_ACTOR      |

| Branch     | GITHUB_REF        |

| Commit     | GITHUB_SHA        |



_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 '*'._



The action will use session tagging by default during role assumption, unless

you follow our recommendation and are assuming a role with a WebIdentity. For

WebIdentity role assumption, the session tags have to be included in the encoded

WebIdentity token. This means that tags can only be supplied by the OIDC

provider, and they cannot set during the AssumeRoleWithWebIdentity API call

within the Action. See [#419](https://github.com/aws-actions/configure-aws-credentials/issues/419)

for more information.



You can skip this session tagging by providing

`role-skip-session-tagging` as true in the action's inputs:

```yaml

      uses: aws-actions/configure-aws-credentials@v4

      with:

        role-skip-session-tagging: true

```



### 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 like this:

```yaml

      uses: aws-actions/configure-aws-credentials@v4

      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

      with:

         inline-session-policy: >-

          {

           "Version": "2012-10-17",

           "Statement": [

            {

             "Sid":"Stmt1",

             "Effect":"Allow",

             "Action":"s3:List*",

             "Resource":"*"

            }

           ]

          }

```



#### 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. You can pass a single managed policy like this:

```yaml

      uses: aws-actions/configure-aws-credentials@v4

      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

      with:

         managed-session-policies: |

          arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess

          arn:aws:iam::aws:policy/AmazonS3OutpostsReadOnlyAccess

```



### Misc



#### Adjust the retry mechanism

You can now configure retry settings for when 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 since it's not

considered sensitive information. However, 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.



#### 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).

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

`retry-max-attempts` options. We recommend that you do not enable this option

unless required, because retrying APIs infinitely until they succeed is not best

practice.



## OIDC



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. 



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

   [#953](https://github.com/aws-actions/configure-aws-credentials/issues/953).



5. Specify that role's ARN when setting up this action.



First, in order for this action to create the JWT, your workflow file must have

the `id-token: write` permission:



```yaml

    permissions:

      id-token: write

      contents: read

```



### OIDC Audience



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:



```yaml

    - name: Configure AWS Credentials for China region audience

      uses: aws-actions/configure-aws-credentials@v4

      with:

        audience: sts.amazonaws.com.cn

        aws-region: us-east-3

        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

with the provider as an IAM IdP. The GitHub OIDC provider only needs to be

created once per account (i.e. multiple IAM Roles that can be assumed by the

GitHub's OIDC can share a single OIDC Provider). Here is a sample CloudFormation

template that will configure this trust for you.



Note that the thumbprint below has been set to all F's because the thumbprint is

not used when authenticating `token.actions.githubusercontent.com`. This is a

special case used *only when GitHub's OIDC is authenticating to IAM*. IAM uses

its library of trusted CAs to authenticate. The value is still the API, so it

must be specified.



You can copy the template below, or load it from here: 

https://d38mtn6aq9zhn6.cloudfront.net/configure-aws-credentials-latest.yml



```yaml

Parameters:

  GitHubOrg:

    Description: Name of GitHub organization/user (case sensitive)

    Type: String

  RepositoryName:

    Description: Name of GitHub repository (case sensitive)

    Type: String

  OIDCProviderArn:

    Description: Arn for the GitHub OIDC Provider.

    Default: ""

    Type: String

  OIDCAudience:

    Description: Audience supplied to configure-aws-credentials.

    Default: "sts.amazonaws.com"

    Type: String



Conditions:

  CreateOIDCProvider: !Equals 

    - !Ref OIDCProviderArn

    - ""



Resources:

  Role:

    Type: AWS::IAM::Role

    Properties:

      AssumeRolePolicyDocument:

        Statement:

          - Effect: Allow

            Action: sts:AssumeRoleWithWebIdentity

            Principal:

              Federated: !If 

                - CreateOIDCProvider

                - !Ref GithubOidc

                - !Ref OIDCProviderArn

            Condition:

              StringEquals:

                token.actions.githubusercontent.com:aud: !Ref OIDCAudience

              StringLike:

                token.actions.githubusercontent.com:sub: !Sub repo:${GitHubOrg}/${RepositoryName}:*



  GithubOidc:

    Type: AWS::IAM::OIDCProvider

    Condition: CreateOIDCProvider

    Properties:

      Url: https://token.actions.githubusercontent.com

      ClientIdList: 

        - sts.amazonaws.com

      ThumbprintList:

        - ffffffffffffffffffffffffffffffffffffffff



Outputs:

  Role:

    Value: !GetAtt Role.Arn 

```



### 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),

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)

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)

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)

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)

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).

Due to implementation details, not every OIDC claim is presently supported by

IAM.



### Further information about OIDC



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/)



## 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. We will use the standard AWS JavaScript SDK credential

resolution methods to find your credentials, so if the AWS JS SDK can

authenticate on your runner, this Action will as well.



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/v3/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@v4

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@v4

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.



You can also assume a role using a web identity token file, such as if using

[Amazon EKS IRSA](https://docs.aws.amazon.com/eks/latest/userguide/iam-roles-for-service-accounts-technical-overview.html). Pods running in EKS

worker nodes that do not run as root can use this file to assume a role with a

web identity.



### Proxy Configuration



If need use a HTTP proxy you can set it in the action manually.



Additionally this action will always consider the `HTTP_PROXY` environment

variable.



Manually configured proxy:

```yaml

uses: aws-actions/configure-aws-credentials@v4

with:

  aws-region: us-east-2

  role-to-assume: my-github-actions-role

  http-proxy: "http://companydomain.com:3128"

```



Proxy configured in the environment variable:

```bash

# Your environment configuration

HTTP_PROXY="http://companydomain.com:3128"

```



### Use with the AWS CLI

This workflow does _not_ install the [AWS CLI](https://aws.amazon.com/cli/)

into your environment. Self-hosted runners that intend to run this action prior

to executing `aws` commands need to have the AWS CLI

[installed](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html)

if it's not already present. 

Most [GitHub hosted runner environments](https://github.com/actions/virtual-environments)

should include the AWS CLI by default.



## Examples



### AssumeRoleWithWebIdentity (recommended)

```yaml

    - name: Configure AWS Credentials

      uses: aws-actions/configure-aws-credentials@v4

      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

      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

      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

      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, AssumeRole with temporary credentials

```yaml

    - name: Configure AWS Credentials 1

      id: creds

      uses: aws-actions/configure-aws-credentials@v4

      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

      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.

 

## 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:[email protected]).