Configure Credential Detection with the Windows-based User-ID Agent
Domain Credential Filter detection enables the firewall to detect passwords submitted to web pages. This credential detection method requires the Windows-based User-ID agent and the User-ID credential service, an add-on to the User-ID agent, to be installed on a read-only domain controller (RODC).
An RODC is a Microsoft Windows server that maintains a read-only copy of an Active Directory database that a domain controller hosts. When the domain controller is located at a corporate headquarters, for example, RODCs can be deployed in remote network locations to provide local authentication services. Installing the User-ID agent on an RODC can be useful for a few reasons: access to the domain controller directory is not required to enable credential detection and you can support credential detection for a limited or targeted set of users. Because the directory the RODC hosts is read-only, the directory contents remain secure on the domain controller.
The Domain Credential Filter detection method is supported with the Windows-based User-ID agent only. You cannot use the PAN-OS integrated User-ID agent to configure this method of credential detection.
Because you must install the Windows-based User-ID agent on the RODC for credential detection, as a best practice deploy a separate agent for this purpose. Do not use the User-ID agent installed on the RODC to map IP addresses to users.
After you install the User-ID agent on an RODC, the User-ID credential service runs in the background and scans the directory for the usernames and password hashes of group members that are listed in the RODC password replication policy (PRP)—you can define who you want to be on this list. The User-ID credential service then takes the collected usernames and password hashes and deconstructs the data into a type of bit mask called a bloom filter. Bloom filters are compact data structures that provide a secure method to check if an element (a username or a password hash) is a member of a set of elements (the sets of credentials you have approved for replication to the RODC). The User-ID credential service forwards the bloom filter to the Windows-based User-ID agent; the firewall retrieves the latest bloom filter from the User-ID agent at regular intervals and uses it to detect usernames and password hash submissions. Depending on your settings, the firewall then blocks, alerts, or allows on valid password submissions to web pages, or displays a response page to users warning them of the dangers of phishing, but allowing them to continue with the submission.
Throughout this process, the User-ID agent does not store or expose any password hashes, nor does it forward password hashes to the firewall. Once the password hashes are deconstructed into a bloom filter, there is no way to recover them.
User Mapping Using the Windows User-ID Agent.To enable credential detection, you must install the Windows-based User-ID agent on an RODC (requires Microsoft Windows 2008r2 64 or later). Install a separate User-ID agent for this purpose.Important items to remember when setting up User-ID to enable Domain Credential Filter detection:
- Because the effectiveness of credential phishing detection is dependent on your RODC setup, make sure that you also review best practices and recommendations for RODC Administration.
- Download User-ID software updates:
- User-ID Agent Windows installer—UaInstall-x.x.x-x.msi.
- User-ID Agent Credential Service Windows installer—UaCredInstall64-x.x.x-x.msi.
- Install the User-ID agent and the User Agent Credential service on an RODC using an account that has privileges to read Active Directory via LDAP (the User-ID agent also requires this privilege).
- Enable the User-ID agent and the User Agent Credential
service (which runs in the background to scan permitted credentials)
to share information.
- On the RODC server, launch the User-ID Agent.
- Select Setup and edit the Setup section.
- Select the Credentials tab. This tab only displays if you have already installed the User-ID Agent Credential Service.
- Select Import from User-ID Credential Agent. This enables the User-ID agent to import the bloom filter that the User-ID credential agent creates to represent users and the corresponding password hashes.
- Click OK, Save your settings, and Commit.
- In the RODC directory, define the group of users for
which you want to support credential submission detection.
- Confirm that the groups that should receive credential submission enforcement are added to the Allowed RODC Password Replication Group.
- Check that none of the groups in the Allowed RODC Password Replication Group are also in the Denied RODC Password Replication Group by default. Groups listed in both will not be subject to credential phishing enforcement.
- Continue to the next task.Set Up Credential Phishing Prevention on the firewall.
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