I need to attach IAM role to my EC2 instance.

Question

PentestEnvironment-Deployment-Role/octopus is not authorized to perform: iam:PassRole on resource. I have CF template which create Ec2 and Iam role for my env and all this env I create from not-root account.
Iam Role for this account it's only main part:
        {
            "Sid": "IAM1",
            "Effect": "Allow",
            "Action": [
                "iam:PassRole"
            ],
            "Resource": [
                "arn:aws:iam::*:role/Pentest-EC2-Role"
            ],
            "Condition": {
                "StringEquals": {
                    "iam:PassedToService": "ec2.amazonaws.com"
                },
                "StringLike": {
                    "iam:AssociatedResourceARN": [
                        "arn:aws:ec2:us-west-2:*:instance/*"
                    ]
                }
            }
        },
        {
            "Sid": "IAM2",
            "Effect": "Allow",
            "Action": [
                "iam:GetRole",
                "iam:CreateRole",
                "iam:DeleteRole",
                "iam:DetachRolePolicy",
                "iam:AttachRolePolicy",
                "iam:PutRolePolicy",
                "iam:GetRolePolicy"
            ],
            "Resource": [
                "arn:aws:iam::*:role/Pentest-EC2-Role"
            ]
        },
        {
            "Sid": "IAM3",
            "Effect": "Allow",
            "Action": [
                "iam:ListRoles"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Sid": "IAM4",
            "Effect": "Allow",
            "Action": [
                "iam:GetPolicy",
                "iam:CreatePolicy",
                "iam:ListPolicyVersions",
                "iam:CreatePolicyVersion",
                "iam:DeletePolicy",
                "iam:DeletePolicyVersion"
            ],
            "Resource": [
                "arn:aws:iam::*:policy/Pentest-AWS-resources-Access"
            ]
        },
        {
            "Sid": "IAM5",
            "Effect": "Allow",
            "Action": [
                "iam:CreateInstanceProfile",
                "iam:DeleteInstanceProfile",
                "iam:RemoveRoleFromInstanceProfile",
                "iam:AddRoleToInstanceProfile"
            ],
            "Resource": "arn:aws:iam::*:instance-profile/Pentest-Instance-Profile"
        },
        {
            "Sid": "EC2InstanceProfile",
            "Effect": "Allow",
            "Action": [
                "ec2:DisassociateIamInstanceProfile",
                "ec2:AssociateIamInstanceProfile",
                "ec2:ReplaceIamInstanceProfileAssociation"
            ],
            "Resource": "arn:aws:ec2:*:*:instance/*"
        }
    ]
}

Why do I have this error?

Ganesh Kudikala · Answer

Hi

I think you can add another permission on the policy to recheck if the issue persists again.

```
{ 
    "Sid": "IAM1", 
    "Effect": "Allow", 
    "Action": [ "iam:PassRole","iam:GetRole" ], 
    "Resource": [ "arn:aws:iam:::role/Pentest-EC2-Role" ], 
    "Condition": { "StringEquals": { "iam:PassedToService": "ec2.amazonaws.com" }, 
    "StringLike": { "iam:AssociatedResourceARN": [ "arn:aws:ec2:us-west-2::instance/" ] } } 
}
```
Check the EC2 trusted policy is there and its correct.

Test the Policies: You can use AWS IAM simulator to check if the policy permissions are okay https://policysim.aws.amazon.com/home/index.jsp?#

I need to attach IAM role to my EC2 instance.

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