AWS-Parameters-and-Secrets-Lambda-Extension-iam

iam.tf

resource "aws_iam_role" "ssm_lambda_exec" {
  name = "parameter_layer_test-lambda-exec"

  assume_role_policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "sts:AssumeRole",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Effect": "Allow",
      "Sid": ""
    }
  ]
}
EOF
}

resource "aws_iam_role_policy_attachment" "lambda_basic_exec_attachment" {
  role       = aws_iam_role.ssm_lambda_exec.name
  policy_arn = "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
}

resource "aws_iam_policy" "lambda_ssm_access" {
  name        = "parameter_layer_test-ssm-access-policy"
  description = "Allow lambda to access SSM"

  policy = <<EOF
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "ssm:GetParameter*",
      "Resource": ["arn:aws:ssm:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:parameter/lambda/*"]
    }
  ]
}
EOF
}

resource "aws_iam_role_policy_attachment" "ssm_attachment" {
  role       = aws_iam_role.ssm_lambda_exec.name
  policy_arn = aws_iam_policy.lambda_ssm_access.arn
}