AWS Github OIDC Provider Terraform Module

This module allows you to create a GitHub OIDC provider (supporting both GitHub Actions and GitHub Audit Log streams) and associated IAM roles. This enables GitHub Actions, or external systems consuming GitHub audit logs via OIDC, to securely authenticate against the AWS API using an IAM role.

We recommend using GitHub's OIDC provider to get short-lived credentials needed for your actions. Specifying role-to-assume without providing an aws-access-key-id or a web-identity-token-file will signal to the action that you wish to use the OIDC provider. The default session duration is 1 hour when using the OIDC provider to directly assume an IAM Role. The default session duration is 6 hours when using an IAM User to assume an IAM Role (by providing an aws-access-key-id, aws-secret-access-key, and a role-to-assume) . 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. The default session name is GitHubActions, and you can modify it by specifying the desired name in role-session-name.

• How to Hook EKS

Features

1. Create an AWS OIDC provider for GitHub Actions
2. Create one or more IAM role that can be assumed by GitHub Actions
3. IAM roles can be scoped to :
   • One or more GitHub organisations
   • One or more GitHub repository
   • One or more branches in a repository

Feature	Status
Support for GitHub Actions and Audit Log OIDC providers	✅
Create a role for all repositories in a specific Github organisation	✅
Create a role specific to a repository for a specific organisation	✅
Create a role specific to a branch in a repository	✅
Create a role for multiple organisations/repositories/branches	✅
Create a role for organisations/repositories/branches selected by wildcard (e.g. feature/* branches)	✅

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Documentation

• TFLint Rules

Provider Types and Conditions

This module supports two types of GitHub OIDC providers, configurable via the github_provider input variable:

• "actions" (default): For integrating with GitHub Actions.

  • The OIDC provider URL will be https://token.actions.githubusercontent.com.
  • The thumbprint used will be taken from the var.github_thumbprint input variable, which defaults to the standard thumbprint for GitHub Actions.
  • The IAM role's trust policy will include:
    • A condition checking token.actions.githubusercontent.com:aud equals sts.amazonaws.com.
    • If var.repositories is provided (recommended for scoping permissions), an additional condition restricts token.actions.githubusercontent.com:sub (subject) using StringLike to patterns like repo:your-org/your-repo:*.

• "audit-log": For integrating with GitHub Enterprise Audit Log streaming using OIDC.

  • The OIDC provider URL will be https://oidc-configuration.audit-log.githubusercontent.com.
  • The thumbprint used is specific to the audit log OIDC endpoint and is managed internally by the module.
  • The var.enterprise_name input variable must be set to your GitHub Enterprise name (case-sensitive).
  • The IAM role's trust policy will include:
    • A condition checking oidc-configuration.audit-log.githubusercontent.com:aud equals sts.amazonaws.com.
    • If var.enterprise_name is provided, an additional condition restricts oidc-configuration.audit-log.githubusercontent.com:sub (subject) using StringEquals to https://github.com/YOUR_ENTERPRISE_NAME (where YOUR_ENTERPRISE_NAME is from var.enterprise_name).

Default Usage (GitHub Actions)

IMPORTANT: The master branch is used in source just as an example in older READMEs. In your code, do not pin to master because there may be breaking changes between releases. Instead pin to the release tag (e.g. ?ref=tags/x.y.z or version = "x.y.z") of one of our latest releases.

module "github_oidc_actions" {
  source  = "terraform-module/github-oidc-provider/aws"
  version = "~> 1.0" // TODO: Replace with the latest appropriate version tag

  create_oidc_provider = true
  create_oidc_role     = true

  // Example: Allow any repository in 'my-org' or a specific branch in 'another-repo'
  repositories = [
    "my-org/*",
    "my-org/another-repo:ref:refs/heads/main"
  ]
  oidc_role_attach_policies = [
    "arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly"
  ]
}

Audit Log Provider Usage

To use the GitHub Audit Log OIDC provider, you must specify github_provider = "audit-log" and provide your enterprise_name.

module "github_oidc_audit_log" {
  source  = "terraform-module/github-oidc-provider/aws"
  version = "~> 1.0" // TODO: Replace with the latest appropriate version tag

  create_oidc_provider = true
  create_oidc_role     = true

  github_provider = "audit-log"
  enterprise_name = "MyGitHubEnterprise" // Replace with your actual enterprise name (case-sensitive)

  // Policies attached to the role that will be assumed by the audit log consumer
  oidc_role_attach_policies = [
    "arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess" // Example policy
  ]
  // Note: The 'repositories' variable is not used when github_provider is 'audit-log'.
}

Examples

See examples directory for working examples to reference

• Examples Dir

Assumptions

Available features

Note: The Inputs and Outputs tables below are auto-generated. After making changes to variables, please run terraform-docs . or your pre-commit hooks to ensure this section is up-to-date with new variables like github_provider and enterprise_name.

AWS Github OIDC Provider Terraform Module

Purpose

This module allows you to create a Github OIDC provider for your AWS account, that will help Github Actions to securely authenticate against the AWS API using an IAM role

Requirements

Name	Version
terraform	>= 1

Providers

Name	Version
aws	n/a

Modules

No modules.

Resources

Name	Type
aws_iam_openid_connect_provider.this	resource
aws_iam_role.this	resource
aws_iam_role_policy_attachment.attach	resource
aws_iam_policy_document.this	data source

Inputs

Name	Description	Type	Default	Required
create_oidc_provider	Whether or not to create the associated oidc provider. If false, variable 'oidc_provider_arn' is required	bool	true	no
oidc_provider_arn	ARN of the OIDC provider to use. Required if 'create_oidc_provider' is false	string	null	no
create_oidc_role	Whether or not to create the OIDC attached role	bool	true	no
github_thumbprint	GitHub OpenID TLS certificate thumbprint.	string	"6938fd4d98bab03faadb97b34396831e3780aea1"	no
max_session_duration	Maximum session duration in seconds.	number	3600	no
oidc_role_attach_policies	Attach policies to OIDC role.	list(string)	[]	no
repositories	List of GitHub organization/repository names authorized to assume the role.	list(string)	[]	no
role_description	(Optional) Description of the role.	string	"Role assumed by the GitHub OIDC provider."	no
role_name	(Optional, Forces new resource) Friendly name of the role.	string	"github-oidc-provider-aws"	no
tags	A mapping of tags to assign to all resources	map(string)	{}	no
github_provider	Type of GitHub OIDC provider to create.	string	"actions"	no
enterprise_name	GitHub Enterprise name for audit log provider.	string	null	no

Outputs

Name	Description
oidc_provider_arn	OIDC provider ARN
oidc_role	CICD GitHub role.

📝 Guidelines

• 📝 Use a succinct title and description.
• 🐛 Bugs & feature requests can be be opened
• 📶 Support questions are better asked on Stack Overflow
• 😊 Be nice, civil and polite (as always).

License

Copyright 2022 Ivan Katliarhcuk

MIT Licensed. See LICENSE for full details.

How to Contribute

Submit a pull request

Authors

Currently maintained by Ivan Katliarchuk and these awesome contributors.

Terraform Registry

• Module

Resources

• AWS: create oidc
• Github: configure OIDC aws
• Github: OIDC cloud
• AWS creds github action
• AWS Docs
• Github OIDC
• Terraform: oidc complex
• Terraform: oidc simple
• Terraform: oidc

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