AWS_IAM
AWS Security

Restrict AWS Console Access Based On Source IP Address

By
on
October 21, 2020

Zero trust, or risk-based authentication, can be hard to achieve (You can read more about it here). Organizations must trust the identity being used and the location from where the user is authenticating. Many cloud-based services, like AWS, have functionality built in to help protect your account. This is a must in preventing account takeover (ATO) while protecting the confidentiality, integrity, and availability of your AWS systems.

AWS’ built-in tools help protect your account which is easy to use. It is an automated process to validate that your Root account has multifactor authentication turned on, the Root account does not have programmatic access, etc. One function that is missing from the GUI is protecting accounts from untrusted networks. To do this, go to IAM and click on Policies. Create a new policy and use the JSON editor to paste the following:

{
  "Version": "2012-10-17",
  "Statement": {
    "Effect": "Deny",
    "Action": "*",
    "Resource": "*",
    "Condition": {"NotIpAddress": 
    {"aws:SourceIp": [
      "Source IP Address"
    ]}}
  }
}

Replace “Source IP Address” with your source IP address(es) of your corporate network.

Once the policy has been created, attach the policy to either a user account or a group that users are apart of. Now when someone tries to log in, from outside the network, the person will receive an “Access Denied” while trying to access any AWS resources.

For the latest on this policy, or other AWS policies, please check out the GitHub Repo.

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