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feat: add support for EC2 Instance Identity roles #693

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feat: add support for EC2 Instance Identity roles #693

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8 changes: 7 additions & 1 deletion pkg/token/token.go
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Expand Up @@ -623,6 +623,7 @@ func getIdentityFromSTSResponse(id *Identity, wrapper getCallerIdentityWrapper)
// 1. UserID:SessionName (for assumed roles)
// 2. UserID (for IAM User principals).
// 3. AWSAccount:CallerSpecifiedName (for federated users)
// 4. AWSAccount:aws:ec2-instance:instance-id (for EC2 instance identity roles)
// We want the entire UserID for federated users because otherwise,
// its just the account ID and is indistinguishable from the UserID
// of the root user.
Expand All @@ -634,7 +635,12 @@ func getIdentityFromSTSResponse(id *Identity, wrapper getCallerIdentityWrapper)
id.UserID = userIDParts[0]
id.SessionName = userIDParts[1]
} else {
return nil, NewSTSError(fmt.Sprintf("malformed UserID %q", result.UserID))
if len(userIDParts) == 4 && userIDParts[1] == "aws" && userIDParts[2] == "ec2-instance" {
id.UserID = userIDParts[1] + ":" + userIDParts[2]
id.SessionName = userIDParts[3]
} else {
return nil, NewSTSError(fmt.Sprintf("malformed UserID %q", result.UserID))
}
}
}

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