not authorized to perform: sts:AssumeRole

Question

AWSSecurityTokenServiceException: User: arn:aws:iam::xxx is not authorized to perform: sts:AssumeRole on resource: arn:aws:iam::xxx (Service: AWSSecurityTokenService; Status Code: 403; Error Code: AccessDenied; Request ID: xxx; Proxy: null)
    at io.mitigant.mitigantapi.aws.ssmdocuments.AWSSimpleSystemsManagementDocumentsSecurityRule.lambda$apply$5(AWSSimpleSystemsManagementDocumentsSecurityRule.java:66)
...
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CompletionException: com.amazonaws.services.securitytoken.model.AWSSecurityTokenServiceException: User: arn:aws:iam::xxx is not authorized to perform: sts:AssumeRole on resource: arn:aws:iam::xxx (Service: AWSSecurityTokenService; Status Code: 403; Error Code: AccessDenied; Request ID: xxx; Proxy: null)
    at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314)
    at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319)
    at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1702)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
...

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Answer

Here is an AWS Support Knowledge Center article that may give you pointers on how to debug this - https://aws.amazon.com/premiumsupport/knowledge-center/iam-assume-role-error/

Answer

Just to add a bit more detail to Indranil's answer: Your IAM User does not have permission to call the `sts:AssumeRole` action to assume the role.

Adding that permission to the user (for the role resource that you're attempting to assume) will fix the error.

not authorized to perform: sts:AssumeRole

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