new resource aws_iam_outbound_web_identity_federation

[alexbacchin]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

Introduce a new Terraform resource to manage the IAM “Outbound Web Identity Federation” account setting.

• New resource: aws_iam_outbound_web_identity_federation
• Single argument: enabled (controls whether the setting is active)
• On create/update: configures the account-level setting based on enabled
• On destroy: disables IAM Outbound Web Identity Federation.
• Import support: yes

Usage

resource "aws_iam_outbound_web_identity_federation" "this" {
  enabled = true
}

Relations

Closes #45146

References

Output from Acceptance Testing

% make testacc TESTS=TestAccIAMOutboundWebIdentityFederation_basic PKG=iam                
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
make: Running acceptance tests on branch: 🌿 f-iam_outbound_web_identity_federation 🌿...
TF_ACC=1 go1.24.10 test ./internal/service/iam/... -v -count 1 -parallel 20 -run='TestAccIAMOutboundWebIdentityFederation_basic'  -timeout 360m -vet=off
2025/11/23 22:21:49 Creating Terraform AWS Provider (SDKv2-style)...
2025/11/23 22:21:49 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccIAMOutboundWebIdentityFederation_basic
--- PASS: TestAccIAMOutboundWebIdentityFederation_basic (29.10s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/iam        33.813s

...

[github-actions]

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[christophetd]

As someone interested by this feature (and by no means a Terraform core contributor), I left a few comments. I also think we need a data source to retrieve the issuer_identifier of a specific account ID, and possible retrieve the status of iam outbound federation in the account