Add authentication_method and service_access_role_arn to postgres_settings for aws_dms_endpoint

[dacohen]

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

This PR adds the authentication_method and service_access_role_arn settings to the postgres_settings block for aws_dms_endpoint. These are necessary for using IAM authentication with a DMS Endpoint.

Relations

Closes #43289

References

Output from Acceptance Testing

% make testacc TESTS=TestAccDMSEndpoint_PostgreSQL_settings PKG=dms

make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.5 test ./internal/service/dms/... -v -count 1 -parallel 20 -run='TestAccDMSEndpoint_PostgreSQL_settings'  -timeout 360m -vet=off
2025/07/17 23:15:15 Creating Terraform AWS Provider (SDKv2-style)...
2025/07/17 23:15:15 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccDMSEndpoint_PostgreSQL_settings_source
=== PAUSE TestAccDMSEndpoint_PostgreSQL_settings_source
=== RUN   TestAccDMSEndpoint_PostgreSQL_settings_target
=== PAUSE TestAccDMSEndpoint_PostgreSQL_settings_target
=== CONT  TestAccDMSEndpoint_PostgreSQL_settings_source
=== CONT  TestAccDMSEndpoint_PostgreSQL_settings_target
--- PASS: TestAccDMSEndpoint_PostgreSQL_settings_target (123.34s)
--- PASS: TestAccDMSEndpoint_PostgreSQL_settings_source (123.71s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/dms        128.146s

[github-actions]

✅ Thank you for correcting the previously detected issues! The maintainers appreciate your efforts to make the review process as smooth as possible.

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccDMSEndpoint_PostgreSQL\|TestAccDMSEndpointDataSource_basic' PKG=dms ACCTEST_PARALLELISM=3
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.24.5 test ./internal/service/dms/... -v -count 1 -parallel 3  -run=TestAccDMSEndpoint_PostgreSQL\|TestAccDMSEndpointDataSource_basic -timeout 360m -vet=off
2025/07/22 10:59:26 Creating Terraform AWS Provider (SDKv2-style)...
2025/07/22 10:59:26 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccDMSEndpointDataSource_basic
=== PAUSE TestAccDMSEndpointDataSource_basic
=== RUN   TestAccDMSEndpoint_PostgreSQL_basic
=== PAUSE TestAccDMSEndpoint_PostgreSQL_basic
=== RUN   TestAccDMSEndpoint_PostgreSQL_secretID
=== PAUSE TestAccDMSEndpoint_PostgreSQL_secretID
=== RUN   TestAccDMSEndpoint_PostgreSQL_update
=== PAUSE TestAccDMSEndpoint_PostgreSQL_update
=== RUN   TestAccDMSEndpoint_PostgreSQL_kmsKey
=== PAUSE TestAccDMSEndpoint_PostgreSQL_kmsKey
=== RUN   TestAccDMSEndpoint_PostgreSQL_settings_source
=== PAUSE TestAccDMSEndpoint_PostgreSQL_settings_source
=== RUN   TestAccDMSEndpoint_PostgreSQL_settings_target
=== PAUSE TestAccDMSEndpoint_PostgreSQL_settings_target
=== CONT  TestAccDMSEndpointDataSource_basic
=== CONT  TestAccDMSEndpoint_PostgreSQL_kmsKey
=== CONT  TestAccDMSEndpoint_PostgreSQL_secretID
--- PASS: TestAccDMSEndpointDataSource_basic (26.16s)
=== CONT  TestAccDMSEndpoint_PostgreSQL_settings_target
--- PASS: TestAccDMSEndpoint_PostgreSQL_secretID (29.68s)
=== CONT  TestAccDMSEndpoint_PostgreSQL_settings_source
--- PASS: TestAccDMSEndpoint_PostgreSQL_kmsKey (35.46s)
=== CONT  TestAccDMSEndpoint_PostgreSQL_update
--- PASS: TestAccDMSEndpoint_PostgreSQL_settings_source (18.11s)
=== CONT  TestAccDMSEndpoint_PostgreSQL_basic
--- PASS: TestAccDMSEndpoint_PostgreSQL_settings_target (24.00s)
--- PASS: TestAccDMSEndpoint_PostgreSQL_basic (20.03s)
--- PASS: TestAccDMSEndpoint_PostgreSQL_update (34.97s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/dms	75.296s

[jar-b]

LGTM 🚀

[ewbankkit]

@dacohen Thanks for the contribution 🎉 👏.

[github-actions]

Warning

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Ongoing conversations amongst community members are welcome, however, the issue will be locked after 30 days. Moving conversations to another venue, such as the AWS Provider forum, is recommended. If you have additional concerns, please open a new issue, referencing this one where needed.

[github-actions]

This functionality has been released in v6.5.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.