AWS Assume Role Issue Examples

main.tf

terraform {
  backend "s3" {
    # Bucket Configuration
    bucket = "bstopp"
    key    = "terraform/stopp.tfstate"
    region = "us-east-1"

    # AWS Security Access.
    profile      = "session_profile"
    session_name = "Terraform"
    // The role_arn needs to be passed on the command line:
    // terraform init -backend-config="role_arn=arn:aws:iam::<account id>:role/Terraform"
  }
}

TerraformRolePolicy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "S3BucketAccess",
            "Effect": "Allow",
            "Action": "s3:ListBucket",
            "Resource": "arn:aws:s3:::bstopp"
        },
        {
            "Sid": "S3StateAccess",
            "Effect": "Allow",
            "Action": [
                "s3:PutObject",
                "s3:GetObject"
            ],
            "Resource": "arn:aws:s3:::bstopp/terraform/stopp.tfstate"
        }
    ]
}

TerraformRoleTrustPolicy.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::<<account id>>:root"
      },
      "Action": "sts:AssumeRole",
      "Condition": {
        "Bool": {
          "aws:MultiFactorAuthPresent": "1"
        }
      }
    }
  ]
}