User Guide for Cisco Secure Access Control Server - Stewing Home

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External Policies 13-8 User Guide for Cisco Secure Access Control Server 4.2 Chapter 13 Posture Validation Note Applying a policy to a posture validation request always results in a match, to one of the configurable rules or to the default rule. When you specify the order of rules in a policy, determine the likelihood of each rule to be true and then order the rules so that the rule most likely to be true is first and the rule least likely to be true is last. Doing so makes rule processing more efficient; however, determining how likely a rule is to be true can be challenging. For example, one rule may be true for the posture of twice as many endpoints as a second rule, but posture validation may occur more than twice as often for endpoints whose posture matches the second rule; therefore, the second rule should be listed first. About Rules, Rule Elements, and Attributes External Policies A rule is a set of one or more rule elements. A rule element is a logical statement which comprises: A posture validation attribute An operator or posture token A value or notification string ACS uses the operator to compare the contents of an attribute to the value. Each rule element of a rule must be true for the whole rule to be true. In other words, all rule elements of a rule are joined with a Boolean AND. For detailed descriptions of rules, see Classification of Access Requests, page 14-2. For information on configuration, see Creating an Internal Policy, page 13-17, and Internal Posture Validation Setup Pages, page 13-30 External policies are policies that an external NAC server defines, usually from an antivirus vendor and a set of credential types to be forwarded to the external database. You also have the option of defining a secondary external NAC server. The presence of a secondary server allows the secondary or failover server to evaluate any policies from the primary server. ACS does not determine the result of applying an external policy; instead, it forwards the selected credentials to the external NAC server and expects to receive the results of the policy evaluation: an APT, a result credential type, and an action. Each external policy that is associated with a external server must return a result; otherwise, ACS rejects policy validation requests that are evaluated with a profile whose external policies do not return a result. For example, if ACS evaluates a posture validation request by using a profile that has 10 internal policies and one external policy, but the external NAC servers associated with the external policy are not online, it is irrelevant that the 10 internal policies all return SPTs. The failure of the single external policy causes ACS to reject the posture validation request. For information on external policy configuration options see Editing an External Posture Validation Server, page 13-23, and External Posture Validation Setup Pages, page 13-33. OL-14386-02
Chapter 13 Posture Validation External Posture Validation Audit Servers OL-14386-02 This section contains: About External Audit Servers, page 13-9 Auditing Device Types, page 13-10 Configuring NAC in ACS, page 13-13 About External Audit Servers External Posture Validation Audit Servers Audit servers are Cisco and third-party servers that determine posture information about a host without relying on the presence of a Posture Agent (PA). The Cisco PA is also known as the Cisco Trust Agent. Audit servers are used to assess posture validation with an organization’s security policy. You can also define a secondary external audit server. The presence of a secondary audit server allows the second or failover server to evaluate any policies from the primary server when the primary server rejects a policy. An audit policy is a set of processing rules for evaluating the posture of a Agentless Host through an audit server. Audit policies are used to retrieve posture decisions for hosts that do not have an EAP supplicant. When a host accesses the network through a NAD that is acting as a NAC enforcement point, the NAD sends information to ACS so that ACS can trigger auditing. If ACS is configured correctly, it queries the audit server for the result (posture token) of the audit and then determines the authorization based on the audit result. Your network-management security strategy may include external audit servers that work with ACS to control access to your network. ACS will use the GAME protocol to communicate with audit servers. In each audit request, ACS forwards the following information to the audit server: host id ip-address mac-address (optional) The name of the System-Posture-Token is dynamically sent (without requiring any configuration) to the device. Table 13-2 defines the details required in applying the results of an audit. Table 13-2 Audit Policy Requirements Audit Policy Description auditServerConfiguration A pointer to the audit server configuration that defines how to communicate with the audit server. exemptionList A list of MAC or IP addresses (or both), and groups that are exempt from audit. inverseExemptionFlag If this flag is set, the meaning of the exemption list will be inversed. That is, only the hosts specified in the list will be audited; all others will be exempt. exemptionToken The token to assign to hosts who are exempt. defaultInProgressToken The token to use when the audit is in progress and we have no cached token. User Guide for Cisco Secure Access Control Server 4.2 13-9
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Numerics 3COMUSR settings 2-14 A AA
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