aws-access-analyzer-validator

aws-access-analyzer-validator

A tool to validate existing identity and resource policies across regions and supported AWS services with AWS IAM Access Analyzer.

This tool

• discovers resource and identity policies attached to resources of supported AWS services (see below) in all commercial regions
• validates these policies with AWS IAM Access Analyzer ValidatePolicy API
• generates a report with Access Analyzer findings

See examples/sample_report.md for an example.

Usage

• Install from PyPI (Python 3.8+ required):

pip install aws-access-analyzer-validator

• Execute the tool:

aws-access-analyzer-validator -o report.md

• Open report.md to see analysis results.

Arguments

aws-access-analyzer-validator supports the following arguments:

• --regions - A comma separated list of regions to limit policy validation to. For example, --regions eu-west-1,eu-north-1 limits validation to policies in eu-west-1 and eu-north-1 regions. Global resources (IAM, S3) are scanned regardless of region limitations.

Supported Services / Resources

aws-access-analyzer-validator validates policies from the following services:

• AWS Identity and Access Management (IAM)
  • Inline policies of IAM users
  • Inline policies of IAM groups
  • Inline policies and trust policy of IAM roles
  • Managed IAM Policies (customer managed)
• Amazon S3 bucket policies
• Amazon SQS queue policies
• Amazon SNS topic policies
• Amazon Elastic Container Registry (ECR) repository policies

Required Permissions

This tool requires the following permissions to operate:

• accessanalyzer:ValidatePolicy
• ecr:DescribeRepositories
• ecr:GetRepositoryPolicy
• iam:GetAccountAuthorizationDetails
• s3:GetBucketPolicy
• s3:ListAllMyBuckets
• sns:GetTopicAttributes
• sns:ListTopics
• sqs:GetQueueAttributes
• sqs:ListQueues

Here's an IAM policy that grants the required privileges:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "PermissionsForAAValidator",
            "Effect": "Allow",
            "Action": [
                "access-analyzer:ValidatePolicy",
                "ecr:DescribeRepositories",
                "ecr:GetRepositoryPolicy",
                "iam:GetAccountAuthorizationDetails",
                "s3:GetBucketPolicy",
                "s3:ListAllMyBuckets",
                "sns:GetTopicAttributes",
                "sns:ListTopics",
                "sqs:GetQueueAttributes",
                "sqs:ListQueues"
            ],
            "Resource": "*"
        }
    ]
}

Development

Requires Python 3.8+ and Poetry. Useful commands:

# Setup environment
poetry install

# Run integration tests (requires admin-level AWS credentials)
make test

# Run linters
make -k lint

# Format code
make format

# Deploy test resources (requires AWS CLI and admin level AWS credentials)
make deploy-test-resources

# Delete test resources
make delete-test-resources

Credits

• Inspired by z0ph/aa-policy-validator.

License

MIT.