GPO SMB Signing Configuration

SMB protocol, Microsoft It is used to share files and printers on a network based on SMB to help detect man-in-the-middle (MITM) attacks that could alter traffic, SMB We can configure signing via group policy.

SMB Signing, WindowsAvailable on all supported versions of . Microsoft also depending on factors such as SMB version, file sizes, and the specific hardware in use, SMB signing the package SMBIt is important to note that this can degrade performance and this is to be expected since we sign every packet that passes through the network, which adds overhead.

that SMB does not encrypt traffic, only the client and server SMB to determine whether traffic has been altered SMB Note that we will configure signing.

SMB Signing configuring it according to our environment GPO We can do this using a new GPO It is recommended that you create a .

For this process we need to follow GPO The step is as follows;

Computer Configuration > Policies > Windows Settings > Security Settings > Local Policies > Security Options.

SMB Signing to be used for structuring 4 There is a policy, this Policies To explain, we can make a definition as follows.

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Microsoft network server: Digitally sign communications (always)

This policy controls whether the server providing SMB requires packet signing, determining whether SMB packet signing must be agreed upon before further communication with the SMB client is allowed.

By default, this setting is enabled for domain controllers, but disabled for other member servers in the domain.

Microsoft network server: Digitally sign communications (if client agrees)

This policy determines whether the SMB server will negotiate SMB packet signing with requesting clients. When this setting is enabled, the SMB server negotiates SMB packet signing based on the client's request. If SMB packet signing is enabled on the client, it is negotiated by the server. By default, this policy is enabled only on domain controllers.

Microsoft network client: Digitally sign communications (always)

Enabling this policy ensures that the SMB client always requires SMB packet signing. If the server does not agree to support SMB packet signing with the client, the client will not communicate with the server. By default, this policy is set to disabled, meaning SMB is allowed by default without requiring packet signing. Negotiating packet signing is still possible, it just doesn't have to work.

Microsoft network client: Digitally sign communications (if server agrees)

This policy is enabled by default and determines whether the SMB client attempts to negotiate SMB packet signing with the server. If this is set to disabled instead, the client will not attempt to negotiate SMB packet signing at all.

Note: Microsoft no longer recommends using the “is server agress and if client agress” options.

You can configure it according to these options and link the created GPO to the OU.


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