User Guide for Cisco Secure Access Control Server - Stewing Home

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Configuring NAC in ACS 13-14 User Guide for Cisco Secure Access Control Server 4.2 Chapter 13 Posture Validation Step 4 Enable the Passed Authentications log. ACS uses this log to log all posture validation credentials whenever access is not strictly denied. If the requests were denied, then ACS logs the results in the Failed Attempts log. When you enable the Passed Authentications log, be sure to move NAC-related attributes to the Logged Attributes column on the Passed Authentications File Configuration page. For detailed steps about configuring this type of log, see Configuring a CSV Log, page 10-24. Step 5 Configure the Failed Attempts log to include NAC attributes. Posture validation requests that were denied are logged to the Failed Attempts log. Including NAC attributes in this log can help you debug errors in your NAC implementation. For example, if none of the posture validation rules is matched, the request is logged here. Using the Failed Attempts log, you can see the contents of the attributes that are received in the request from the endpoint and sent in the reply to the endpoint. For detailed steps about configuring this type of log, see Configuring a CSV Log, page 10-24. Step 6 On the Global Authentication Setup page, enable posture validation by selecting Allow Posture Validation under EAP. Complete the steps for layer 2 or layer 3 support. For detailed steps, see Configuring Authentication Options, page 9-21. Step 7 If you have not already configured the AAA clients supporting NAC in the Network Configuration section, do so now. For detailed steps, see Adding AAA Clients, page 3-12. Step 8 From Network Access Profiles, set up the user groups that you want to use for posture validation. You are likely to want a separate user group for each possible SPT; therefore, select six user groups. If possible, choose groups that have not been configured to authorize users. Additionally, consider using groups that are widely separated from groups that authorize users. For example, assuming that the lowest numbered groups have been used for user authorization, consider using groups 494 through 499. Step 9 For detailed steps on setting up profiles, see Workflow for Configuring NAPs and Profile-based Policies, page 14-3. Tip To avoid confusion between groups that are intended to authorize users and groups that are intended to authorize endpoints, consider renaming the groups with an easily understood name. For example, if you selected group 499 to contain authorizations that are related to the Unknown SPT, you could rename the group NAC Unknown. For detailed steps, see Renaming a User Group, page 5-41. Step 10 For each posture validation rule, assign a posture token and an SPT, which you can later associate with a profile that contains downloadable IP ACL sets, RACs, or both that limit network access appropriately. For detailed steps on creating rules, see Creating an Internal Policy, page 13-17. For detailed steps, see Adding a Downloadable IP ACL, page 4-15 (and Adding RADIUS Authorization Components, page 4-10.) To associate posture rules to profiles, see Posture-Validation Policy Configuration for NAPs, page 14-29. Step 11 For each profile, you can create several different posture validation policies that contain any number of rules to validate your endpoint device. You can: Create a policy and its associated rules, including configuring mandatory credential types and policies. For detailed steps, see Configuring Policies, page 13-15. Use Network Access Profiles to assign posture validation policies to profiles to validate your endpoint devices. OL-14386-02
Chapter 13 Posture Validation OL-14386-02 Configuring ACS in a NAC/NAP Environment For detailed steps, see Posture-Validation Policy Configuration for NAPs, page 14-29. Configuring ACS in a NAC/NAP Environment ACS 4.2 provides configuration options that you can use to configure ACS to work in a Cisco Network Access Control and Microsoft Network Access Protection (NAC/NAP) environment: Configuration of External AAA servers In the Microsoft NAP environment, these are NAP servers that send Statements of Health (SoHs) to ACS or other AAA servers. You can configure ACS to grant or deny access or levels of access based on processing of the SoHs. For more information on configuring external AAA servers, see Setting Up an External AAA Server, page 13-23. Configuration of Statement of Health Posture Validation Rules You can set up SoH posture validation rules to enable ACS to make decisions about user access based on SoH attributes. For more information on setting up SoH posture validation rules, see Setting a Posture-Validation Policy to Process Statements of Health, page 14-32. Note For detailed information on configuring ACS for a NAC/NAP environment, see Chapter 9 of the Configuration Guide for Cisco Secure ACS, 4.2, “NAC/NAP Configuration Scenario.” Configuring Policies If you plan to use NAC in your network, you will need to define the manner in which posture validation will be performed. Policies are sets of rules that are used to determine a posture token for a posture validation request. This section contains: Posture Validation Options, page 13-15 Setting Up Posture Validation Policies, page 13-16 Setting Up an External Policy Server, page 13-22 Setting Up an External Audit Posture Validation Server, page 13-25 Audit Processing with MAC Authentication Bypass, page 13-27 Posture Validation Options You can configure the following posture validation options: Internally within ACS. See Setting Up Posture Validation Policies, page 13-16. Externally by using the Host Credential Authorization Protocol (HCAP) protocol to one or more Posture Validation Servers (PVSs). See Setting Up an External Policy Server, page 13-22. Externally by using the GAME protocol to an audit server for NAC agentless host (NAH) support. See Setting Up an External Audit Posture Validation Server, page 13-25. Table 13-3 describes the setup options for posture validation. User Guide for Cisco Secure Access Control Server 4.2 13-15
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