Comment utiliser : AWS IAM Policy Generator
- Choose IAM policy to attach to a user or role, or S3 bucket policy to attach to a bucket.
- Enter your account ID and region so the ARNs are complete.
- Add one permission per service with + Add permission: pick the access level (read, write, full) and the resource name — a bucket, table, queue, function or secret. Remove one with ×.
- Tick conditions such as Require MFA or HTTPS only, then copy the JSON or the AWS CLI command. Fix anything flagged in the warnings first.
Least privilege in practice
An IAM policy is a list of statements: an Effect (Allow or Deny), the Actions it covers and the Resources they apply to, optionally with Conditions. Least privilege means granting only the actions a workload really uses, on only the resources it needs — so a leaked key can’t delete your database or read every bucket.
- Avoid
"Action": "*"and"Resource": "*"; the generator warns when a statement uses them. - S3 needs two resource forms:
arn:aws:s3:::bucketforListBucketandarn:aws:s3:::bucket/*for objects — the generator splits them automatically. - A few actions only work on
*, such asecr:GetAuthorizationToken; those get their own statement.
Bucket policies
A bucket policy is attached to the bucket and names a Principal — another account, a role, CloudFront or everyone. The recommended setup for websites is a private bucket that only CloudFront with Origin Access Control can read, plus a statement that denies plain-HTTP requests. Public read needs S3 Block Public Access turned off, so only use it for truly public files.
Test policies before production with the IAM policy simulator, and review access with IAM Access Analyzer. Related: Kubernetes YAML Generator, CORS Header Generator.
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