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allow IMDSv2 endpoint to fail, fallback to IMDSv1 #1877

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Aug 23, 2023
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allow IMDSv2 endpoint to fail, fallback to IMDSv1 #1877

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8 changes: 7 additions & 1 deletion pkg/credentials/iam_aws.go
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Original file line number Diff line number Diff line change
Expand Up @@ -291,7 +291,13 @@ func getCredentials(client *http.Client, endpoint string) (ec2RoleCredRespBody,
// https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html
token, err := fetchIMDSToken(client, endpoint)
if err != nil {
return ec2RoleCredRespBody{}, err
// Return only errors for valid situations, if the IMDSv2 is not enabled
// we will not be able to get the token, in such a situation we have
// to rely on IMDSv1 behavior as a fallback, this check ensures that.
// Refer https://github.com/minio/minio-go/issues/1866
if !errors.Is(err, context.DeadlineExceeded) && !errors.Is(err, context.Canceled) {
return ec2RoleCredRespBody{}, err
}
}

// http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html
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