![]() You can use the following command to easily modify this registry key as required: Reg Add KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Diagnostics /v "16 LDAP Interface Events" /t REG_DWORD /d 2. To enable event ID 28, the registry key “ LDAP Interface Events” should be configured to the value of 2 (or higher).All of the events are located under the “Directory Service” log.LDAP Channel Binding Tokens Events Some notes about the LDAP Signing and LDAP Channel Binding Tokens events: Triggered every 24 hours, on startup or start of service if the CBT Group Policy is set to Never. Triggered every 24 hours when CBT Group Policy is set to Never and at least one unprotected bind was completed.Ī summary event-triggered once every 24 hours and indicating that this domain controller is not aligned with Microsoft’s best practices and can be significantly improved by configuring the server to enforce validation of LDAP channel binding tokens. Triggered every time a client attempts to bind without valid CBT when CBT Group Policy is set to When Supported or Always.Ī summary event-triggered once every 24 hours and indicating how many unprotected LDAPs binds were performed. LDAP channel binding events include events 3039, 3040, and 3041 as described in the table below: Event IDĪn event triggered every time a client perform an LDAP bind over SSL/TLS and failed the LDAP channel binding token validation. Unlike LDAP signing events, the LDAP channel binding tokens events are new and required the installation of March 10 Windows Update in order to be available. LDAP Signing Events LDAP Channel Binding Tokens Events Triggered every time a client does not use signing for binds on sessions on port 389. ![]() ![]() The event includes the client IP address and the authentication context (like authenticated user). Triggered every 24 hours when the Group Policy (Domain controller: LDAP server signing requirements) is set to Require Signing and at least one unprotected bind was rejected.Īn event triggered every time a client performs LDAP binds that do not request signing or LDAP simple binds using cleartext. Triggered every 24 hours when Group Policy (Domain controller: LDAP server signing requirements) is set to None and at least one unprotected bind was completed.Ī summary event-triggered once every 24 hours and indicating how many LDAP binds that do not request signing and LDAP simple binds that are performed on cleartext have occurred (and rejected due to the “Require Signing” option). Triggered every 24 hours, on startup or start of service if the Group Policy (Domain controller: LDAP server signing requirements) is set to None.Ī summary event-triggered once every 24 hours and indicating how many LDAP binds that do not request signing and LDAP simple binds that are performed on cleartext have occurred. Event IDĪ summary event-triggered once every 24 hours and indicating that this domain controller is not aligned with Microsoft’s best practices and can be significantly improved by configuring the server to enforce validation of LDAP signing. ![]() Remember that these logs exist since Windows Server 2008, and available regardless of the March 10 Windows Update. Let’s start with LDAP Signing event logs. How to collect the relevant LDAP logs? LDAP Signing Events When LDAP Channel Binding is enabled, Domain Controllers compare the received CBT to the CBT contained in the client authentication information:Īfter installing March 10 Windows Update, LDAP Channel Binding can be configured using Group Policy as well. This is the behavior of all servers that have not been configured otherwise, manually. LDAP channel binding refers to binding the TLS tunnel and the LDAP application layer together to create a unique fingerprint, called Channel Binding Token (CBT).Īny interception of the LDAP communications cannot be re-used as this would require establishing a new TLS tunnel which would invalidate the LDAP communication’s unique fingerprint (the CBT in other words).īy default, LDAP channel binding is disabled, which means that no channel binding validation is performed. Pay attention that LDAP signing must be configured on both sides: Domain Controllers and domain members. LDAP signing can be configured using Group Policy, which reflected in the end by a registry key.
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