Cisco 500 Series, Руководство по настройке

Страница: 216 / 1140

13-14
Cisco Security Appliance Command Line Configuration Guide
OL-12172-03
Chapter 13 Configuring AAA Servers and the Local Database
Configuring an LDAP Server
Note • Sun—The DN configured on the security appliance to access a Sun directory server must be able to
access the default password policy on that server. We recommend using the directory administrator,
or a user with directory administrator privileges, as the DN. Alternatively, you can place an ACI on
the default password policy.
•
Microsoft—You must configure LDAP over SSL to enable password management with Microsoft
Active Directory.
•
Generic—The security appliance does not support password management with a generic LDAPv3
directory server.
Authorization with LDAP for VPN
When user LDAP authentication for VPN access has succeeded, the security appliance queries the LDAP
server which returns LDAP attributes. These attributes generally include authorization data that applies
to the VPN session. Thus, using LDAP accomplishes authentication and authorization in a single step.
There may be cases, however, where you require authorization from an LDAP directory server that is
separate and distinct from the authentication mechanism. For example, if you use an SDI or certificate
server for authentication, no authorization information is passed back. For user authorizations in this
case, you can query an LDAP directory after successful authentication, accomplishing authentication
and authorization in two steps.
To set up VPN user authorization using LDAP, you must first create a AAA server group and a tunnel
group. You then associate the server and tunnel groups using the
tunnel-group general-attributes
command. While there are other authorization-related commands and options available for specific
requirements, the following example shows fundamental commands for enabling user authorization with
LDAP. This example then creates an IPSec remote access tunnel group named remote-1, and assigns that
new tunnel group to the previously created ldap_dir_1 AAA server for authorization.
hostname(config)# tunnel-group remote-1 type ipsec-ra
hostname(config)# tunnel-group remote-1 general-attributes
hostname(config-general)# authorization-server-group ldap_dir_1
hostname(config-general)#
After you complete this fundamental configuration work, you can configure additional LDAP
authorization parameters such as a directory password, a starting point for searching a directory, and the
scope of a directory search:
hostname(config)# aaa-server ldap_dir_1 protocol ldap
hostname(config-aaa-server-group)# aaa-server ldap_dir_1 host 10.1.1.4
hostname(config-aaa-server-host)# ldap-login-dn obscurepassword
hostname(config-aaa-server-host)# ldap-base-dn starthere
hostname(config-aaa-server-host)# ldap-scope subtree
hostname(config-aaa-server-host)#
See LDAP commands in the Cisco Security Appliance Command Reference for more information.
LDAP Attribute Mapping
If you are introducing a security appliance to an existing LDAP directory, your existing LDAP attribute
names and values are probably different from the existing ones. You must create LDAP attribute maps
that map your existing user-defined attribute names and values to Cisco attribute names and values that
are compatible with the security appliance. You can then bind these attribute maps to LDAP servers or
remove them as needed. You can also show or clear attribute maps.