gistfile1.txt

  To ensure that access to `AWSCloudShellFullAccess` is restricted using Terraform, you can create IAM policies with the minimum necessary permissions and attach them to specific IAM users or groups. In this example, we will create an IAM policy that allows only essential AWS CLI actions, denying `AWSCloudShellFullAccess`.

First, make sure you have the latest AWS provider version installed. You can check your current version by running:

```hcl
terraform init -list-providers
```

Next, update your Terraform configuration file (e.g., `main.tf`) with the following code:

```hcl
provider "aws" {
  version = "4.36.0"
}

# Replace this with your actual IAM user name or group name
resource "aws_iam_user" "example_user" {
  name        = "<your-username>"
  path        = "/"
}

resource "aws_iam_group" "example_group" {
  name        = "<your-group-name>"
  path        = "/"
  managed_by  = true
}

# Essential AWS CLI actions
data "aws_iam_policy_document" "essential_cli_actions" {
  statement {
    effect  = "Allow"
    actions = [
      "sts:AssumeRole",
      "ec2:DescribeInstances",
      "s3:ListBucket",
      "s3:GetObject",
      # Add other necessary actions
    ]
    resources = ["*"]
  }
}

# Attach essential policy to the user or group
resource "aws_iam_user_policy" "example_user_policy" {
  name        = "<your-username-policy>"
  user        = aws_iam_user.example_user.name
  policy      = jsonencode(data.aws_iam_policy_document.essential_cli_actions.json)
}

resource "aws_iam_group_policy" "example_group_policy" {
  name        = "<your-group-name-policy>"
  group       = aws_iam_group.example_group.name
  policy      = jsonencode(data.aws_iam_policy_document.essential_cli_actions.json)
}

# Deny AWSCloudShellFullAccess to the user or group
resource "aws_iam_user_policy" "deny_cloudshell_fullaccess_user_policy" {
  name        = "<your-username-deny-cloudshell>"
  user        = aws_iam_user.example_user.name
  policy      = jsonencode({
    Version = "2012-10-17",
    Statement = [
      {
        Effect = "Deny",
        Action = ["sts:AssumeRole"],
        Resource = "*:aws:cloudshell:*:*:*"
      },
      {
        Effect = "Deny",
        Action = ["cloudwatch:*"],
        Resource = "*"
      },
      # Add other denied actions related to AWSCloudShellFullAccess
    ]
  })
}

resource "aws_iam_group_policy" "deny_cloudshell_fullaccess_group_policy" {
  name        = "<your-group-name-deny-cloudshell>"
  group       = aws_iam_group.example_group.name
  policy      = jsonencode({
    Version = "2012-10-17",
    Statement = [
      {
        Effect = "Deny",
        Action = ["sts:AssumeRole"],
        Resource = "*:aws:cloudshell:*:*:*"
      },
      {
        Effect = "Deny",
        Action = ["cloudwatch:*"],
        Resource = "*"
      },
      # Add other denied actions related to AWSCloudShellFullAccess
    ]
  })
}
```

Replace `<your-username>`, `<your-group-name>`, and the policy names with your actual values. This configuration creates an IAM user or group, attaches a minimal policy for essential AWS CLI actions, and denies access to `AWSCloudShellFullAccess`.

After applying this Terraform configuration, the specified IAM user or group will only have access to the essential AWS CLI actions and be denied `AWSCloudShellFullAccess` permissions.