feat: Add support for OIDC policy conditions

[fatmcgav]

Description

This commit adds support to the iam-assumable-role-with-oidc module
for adding policy conditions constraints [1]

Also add an example showing use with aws:RequestTag session tag match [2].

[1] https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document#condition
[2] https://docs.aws.amazon.com/IAM/latest/UserGuide/id_session-tags.html

Motivation and Context

AWS STS session tags allow for additional control when using the AssumeRoleWithWebIdentity authentication call.

Breaking Changes

None

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects
• I have executed pre-commit run -a on my pull request

[bryantbiggs]

this looks like you are looking for the https://github.com/terraform-aws-modules/terraform-aws-iam/tree/master/modules/iam-role-for-service-accounts-eks instead - using that sub-module, is this change still warranted? I'm thinking no

[fatmcgav]

Hey @bryantbiggs ...

So I think this change is still valid, as I'm using session tags in combination with an external OIDC provider, in this case env0. Docs are here: https://docs.env0.com/docs/oidc-with-aws#custom-claims-with-aws-session-tags-optional

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[fatmcgav]

@bryantbiggs / @antonbabenko Any chance of a review on this one? 👍

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This PR has been automatically marked as stale because it has been open 30 days
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[yaroslav-nakonechnikov]

ping

[yaroslav-nakonechnikov]

as i understand, it also covers #426 in different way

[fatmcgav]

@bryantbiggs I've updated this PR following the discussion we had on #479 (comment)

[fatmcgav]

@bryantbiggs OK, I've tweaked the PR to make it more generic.
I did make one tweak to your suggestions, which was to call the variable polcy_conditions rather than prvovider_conditions, as I think the former is closer to the docs.

PTAL 👍

[bryantbiggs]

we can add to existing example instead of creating new

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This PR has been automatically marked as stale because it has been open 30 days
with no activity. Remove stale label or comment or this PR will be closed in 10 days

[fatmcgav]

Apologies, just noticed the failed pre-commit check... Have fixed that now so should be good 🤞

[antonbabenko]

This PR is included in version 5.44.0 🎉

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