User Account Should Not Have Multiple Access Keys

To prevent a user account from having multiple access keys in AWS IAM using the AWS CLI, you can follow these steps:

1. Create a New IAM User Without Access Keys: Ensure that when you create a new IAM user, you do not create multiple access keys for them. Use the following command to create a new IAM user without any access keys:

   aws iam create-user --user-name NewUserName
   

2. Attach Policies to the User: Attach the necessary policies to the user without creating multiple access keys. For example, to attach the AmazonS3ReadOnlyAccess policy:

   aws iam attach-user-policy --user-name NewUserName --policy-arn arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess
   

3. Monitor and List Access Keys: Regularly monitor and list the access keys for each user to ensure they do not have multiple access keys. Use the following command to list access keys for a specific user:

   aws iam list-access-keys --user-name ExistingUserName
   

4. Enforce Policy to Restrict Multiple Access Keys: Create and attach an IAM policy that restricts users from creating multiple access keys. This can be done by defining a policy that denies the iam:CreateAccessKey action if the user already has an active access key. Here is an example of such a policy:

   {
     "Version": "2012-10-17",
     "Statement": [
       {
         "Effect": "Deny",
         "Action": "iam:CreateAccessKey",
         "Resource": "arn:aws:iam::*:user/${aws:username}",
         "Condition": {
           "NumericGreaterThan": {
             "aws:RequestTag/AccessKeyCount": "1"
           }
         }
       }
     ]
   }
   

   Attach this policy to the users or groups as needed:

   aws iam put-user-policy --user-name ExistingUserName --policy-name RestrictMultipleAccessKeys --policy-document file://policy.json
   

By following these steps, you can prevent IAM users from having multiple access keys using the AWS CLI.

To prevent a user account from having multiple access keys in IAM using Python scripts, you can follow these steps:

1. Set Up AWS SDK (Boto3) for Python:

   • Ensure you have the AWS SDK for Python (Boto3) installed. You can install it using pip if you haven’t already:

     pip install boto3
     

2. Create a Python Script to List Access Keys:

   • Write a Python script to list all access keys for a given IAM user. This will help you identify if a user has multiple access keys.

   import boto3
   
   # Initialize a session using Amazon IAM
   session = boto3.Session(profile_name='your_profile_name')
   iam_client = session.client('iam')
   
   # Function to list access keys for a user
   def list_access_keys(user_name):
       response = iam_client.list_access_keys(UserName=user_name)
       return response['AccessKeyMetadata']
   
   # Example usage
   user_name = 'your_iam_user_name'
   access_keys = list_access_keys(user_name)
   print(f"Access keys for user {user_name}: {access_keys}")
   

3. Check for Multiple Access Keys:

   • Extend the script to check if a user has more than one access key and print a warning message if they do.

   def check_multiple_access_keys(user_name):
       access_keys = list_access_keys(user_name)
       if len(access_keys) > 1:
           print(f"Warning: User {user_name} has multiple access keys.")
       else:
           print(f"User {user_name} has a single access key or none.")
   
   # Example usage
   check_multiple_access_keys(user_name)
   

4. Automate the Check for All Users:

   • Automate the process to check all IAM users in your account and ensure none of them have multiple access keys.

   def list_all_users():
       response = iam_client.list_users()
       return response['Users']
   
   def check_all_users_for_multiple_access_keys():
       users = list_all_users()
       for user in users:
           user_name = user['UserName']
           check_multiple_access_keys(user_name)
   
   # Example usage
   check_all_users_for_multiple_access_keys()
   

By following these steps, you can create a Python script that checks for multiple access keys for IAM users and helps prevent this misconfiguration. This script can be run periodically or integrated into your CI/CD pipeline to ensure compliance.