CodePipeline - CodeDeploy blue/green ECS Insufficient permissions

Question

I'm trying to set up CodePipeline to do a blue/green CodeDeploy in a different account. I've been following the documentation at https://docs.aws.amazon.com/codepipeline/latest/userguide/pipelines-create-cross-account.html and  https://docs.aws.amazon.com/AmazonECS/latest/developerguide/codedeploy_IAM_role.html  
  
So far the CodeDeploy deployment works in the deployment account, but I cannot get the Pipeline step to invoke it.   
  
I have three IAM roles involved. In the build account the CodePipeline role has permission to assume the Deployment role in the deployment account. The Deployment role has permission to invoke CodeDeploy and read the shared S3 bucket and KMS key (both are held in the build account and have policies allowing the deployment account access). The CodeDeploy role has all the permissions documented to do a blue/green deployment.  
  
The only error I get is "Insufficient permissions  
The provided role does not have sufficient permissions to access CodeDeploy", but the role passed in to CodePipeline has full access to CodeDeploy. There must be a permission I'm missing but given the lack of information I cannot figure out what it is.

Answer

After more investigation I've found the API event in CloudTrail. It's getting

```
{  [...]
    "errorCode": "AccessDenied",
    "errorMessage": "User: arn:aws:sts::xxxx:assumed-role/codedeploy_pipeline_xxxx_test/xxxx is not authorized to perform: codedeploy:GetApplication on resource: arn:aws:codedeploy:ap-southeast-2:xxxx:application:xxxx-test",
}
```

but the IAM policy document for that role contains

```
        {
            "Action": [
                "codedeploy:*"
            ],
            "Resource": "*",
            "Effect": "Allow"
        },
```

It was more restrictive but I added the wildcard to try to debug. The policy simulator says GetApplication should work.

Answer

After even more digging through CloudTrail I discovered the root was a missing `iam:PassRole` for the ECS container role. This was present on the CodeDeploy role but not on the role passed to CodePipeline to invoke CodeDeploy. The final policy for the CodeDeploy role is

```
{
  "Version": "2012-10-17",
  "Statement": [
    {
        "Action": [
            "codedeploy:CreateDeployment",
            "codedeploy:GetDeployment",
            "codedeploy:GetDeploymentConfig",
            "codedeploy:GetApplicationRevision",
            "codedeploy:RegisterApplicationRevision",
            "codedeploy:GetApplication",
            "ecs:RegisterTaskDefinition"
        ],
        "Resource": "*",
        "Effect": "Allow"
    },
    {
        "Action": [
            "s3:GetObject*",
            "s3:PutObject",
            "s3:PutObjectAcl"
        ],
        "Resource": "arn:aws:s3:::deployment_intermediate_bucket/*",
        "Effect": "Allow"
    },
    {
        "Action": [ "s3:ListBucket"],
        "Resource": "arn:aws:s3:::deployment_intermediate_bucket",
        "Effect": "Allow"
    },
    {
        "Effect": "Allow",
        "Action": [
            "kms:DescribeKey",
            "kms:GenerateDataKey*",
            "kms:Encrypt",
            "kms:ReEncrypt*",
            "kms:Decrypt"
        ],
        "Resource": [
            "${var.deployment_kms_key_arn}"
        ]
    },
    {
        "Action": [
            "iam:PassRole"
        ],
        "Effect": "Allow",
        "Resource": "ecs_container_role_arn"
    }
  ]
}
```

I'm going to try to lock this down some more, in particular the PassRole. The condition string used on the CodeDeploy side didn't seem to work, but I may have entered it wrong.  
  
Edited by: phillipion on Jun 27, 2019 3:54 PM

Answer

How did it go?

CodePipeline -> CodeDeploy blue/green ECS Insufficient permissions

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