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Optionally return full role arn including path during token verification #632

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Optionally return full role arn including path during token verification #632

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terricain
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@terricain terricain commented Sep 27, 2023 •
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What this PR does / why we need it: When creating EKS nodegroups where the node's IAM role contains a path, the nodes fail to join the cluster. This adds the ability to look up a role's full ARN including the path and return that when verifying a token.

The reason this is needed is because the assume-role ARN that is returned by sts.get-caller-idendentity does not include the IAM role's path.

I've added a "role cache" which calles iam.list-roles and stores a mapping between the roles unique role ID and the full ARN, as the UserID returned by sts.get-caller-identity contains the roles unique ID therefore looking up the existing role's correct ARN is possible.

This does require the clusters IAM role to have the iam:ListRoles action. If the role cache gets an error when calling list roles and its not a transient error, it'll disable all future lookups and the functionality will revert to the original behaviour. I figured it would be better to make this more an opt in rather than a requirement as else it might just break nodes joining a cluster whenever its released.

Which issue(s) this PR fixes:
Fixes #268
Fixes #153

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linux-foundation-easycla bot commented Sep 27, 2023 •
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CLA Signed

The committers listed above are authorized under a signed CLA.

  • ✅ login: terrycain / name: Terry Cain (885868b)

@k8s-ci-robot k8s-ci-robot added the cncf-cla: no Indicates the PR's author has not signed the CNCF CLA. label Sep 27, 2023
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@k8s-ci-robot k8s-ci-robot added the needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. label Sep 27, 2023
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Hi @terrycain. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: terrycain
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@k8s-ci-robot k8s-ci-robot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. and removed cncf-cla: no Indicates the PR's author has not signed the CNCF CLA. labels Sep 27, 2023
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@dims / @nckturner / @nnmin-aws can we get a review on this please?

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/test

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@nnmin-aws: The /test command needs one or more targets.
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/test all

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Thanks @nnmin-aws the tests seem to have passed, what now?

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@nnmin-aws @dims @nckturner what else is required for this PR? There's been no progress for nearly 2 months, some guidance would be appreciated.

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dims commented Dec 23, 2023

cc @cartermckinnon

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@terrycain @dims apology for the delay! i am so sorry about it. We were hesitating at the change because it requires additional invocation of aws IAM and might increase latency of authN.

There is another PR actually merged https://github.com/kubernetes-sigs/aws-iam-authenticator/pull/670/files#diff-5de38ab8d77d935766314beeb9a9e3b7165eb470e656dbb5e4fdf9bb60ae59de. which removed the path from the arn comparison.

Could you please kindly pull latest release and verify if it works for your scenario? If it doesn't, we can check this PR again.

Thank you!

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/lifecycle stale

@k8s-ci-robot k8s-ci-robot added the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Mar 22, 2024
@terricain terricain closed this Mar 23, 2024
@terricain terricain deleted the fix_assume_role_path branch March 23, 2024 22:08
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