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The Secure templates define enhanced security settings that are least likely to affect application compatibility. For example, the Secure templates define stronger password, lockout, and audit settings. The Secure templates limit the use of the NTLM authentication protocol by configuring clients to send only NTLM version 2 responses and configuring servers to refuse LanManager responses. To apply Securews.inf to a workstation or member server, all the domain controllers that contain the accounts of users that log on to the client must be running Windows NT 4.0 Service Pack 4 or higher. If a server is configured with Securews.inf, a client with a local account on that server will not be able to connect to it from a LanManager client using that local account. If a domain controller is configured with Securedc.inf, a user with an account in that domain will not be able to connect to any member server from a LanManager client by using his or her domain account. Note
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You can use LanManager on clients running Microsoft Windows for Workgroups, as well as Microsoft Windows 95 and Microsoft Windows 98, without the DS Client Pack installed. If the DS Client Pack is installed on clients running Windows 95 and Windows 98, those clients can use NTLMv2. Windows Me supports NTLMv2.
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The Secure templates also provide further restrictions by preventing anonymous users (for example, users from untrusted domains) from doing the following:
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Enumerating account names and shares Performing SID-to-name or name-to-SID translations
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Finally, the Secure templates enable server-side Server Message Block (SMB) packet signing, which is disabled by default for workstations and servers. Because client-side SMB packet signing is enabled by default, SMB packet signing will always be negotiated when workstations and servers are operating at the secure level.
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High Secure (Hisec*.inf)
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The High Secure templates are supersets of the secure templates and impose further restrictions on the levels of encryption and signing required for authentication and for the data that flows over Secure Channels and between SMB clients and servers. For example, while the Secure templates cause servers to refuse LanManager responses, the High Secure templates cause servers to refuse both LanManager and NTLM responses. While the Secure templates enable server-side SMB packet signing, the High Secure templates require it. Also, the High
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17:
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Managing Authorization and Access Control
Secure templates require strong (128-bit) encryption and signing for the Secure Channel data that constitute domain-to-member and domain-to-domain trust relationships. Therefore, to apply Hisecws.inf to a member computer:
All the domain controllers that contain the accounts of all users that will log on to the client must be running Windows NT 4.0 Service Pack 4 or higher. All the domain controllers for the domain that the client is joined to must be running Windows 2000 or later.
The following rules also apply to the High Secure template:
To apply Hisecdc.inf to a domain controller, all the domain controllers in all trusted or trusting domains must be running Windows 2000 or later. If a server is configured with Hisecws.inf, a client with a local account on that server will not be able to connect to it from a client that does not support NTLMv2. If a server is configured with Hisecws.inf, all clients that want to use SMB to connect to that server must have client-side SMB packet signing enabled. Client-side SMB packetsigning is enabled by default for all Windows XP Professional based computers. If a domain controller is configured with Hisecdc.inf, a user with an account in that domain will not be able to connect to any member server from a client that does not support NTLMv2. If a domain controller is configured with Hisecdc.inf, Lightweight Directory Access Protocol (LDAP) clients will not be able to bind with the Active Directory LDAP server unless data signing is negotiated. Thus, bind requests that use ldap_simple_bind or ldap_simple_bind_s are rejected. By default, all Microsoft LDAP clients that ship with Windows XP Professional request data signing if Transport Layer Security\Secure Sockets Layer (TLS\SSL) is not already in use. If TLS\SSL is in use, data signing is considered to be negotiated.
In addition to further restrictions on the use of downlevel LanManager protocols and the requirements for encryption and signing of secure channel and SMB traffic, the High Secure templates also limit the use of cached logon data such as data stored by Winlogon and Stored User Names and Passwords. Finally, the template Hisecws.inf removes all members of the Power Users group based on the assumption that only applications that are certified under the Designed for Windows XP logo program have been deployed. The template also uses Restricted Groups to ensure that the only members of the local Administrators group are the local Administrator account and Domain Admins. With certified applications in place, neither the insecure Compatible template nor the insecure Power Users group is needed. Instead, users can successfully run certified applications under the secure context of a normal User.
Part III:
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