Enforcing Microsoft Active Directory Policies Using LDAP Attribute

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					Enforcing Microsoft Active Directory Policies Using LDAP Attribute Maps
This document describes using the Adaptive Security Device Manager (ASDM) to configure the ASA 5500 Series Adaptive Security Appliance to enforce Microsoft Active Directory (AD) access policies using LDAP attribute maps. The examples in this document pertain to Microsoft AD. However, LDAP attribute maps can be used to support other directory servers, such as Novell eDirectory, OpenLDAP, and Sun Directory Server. This document includes the following sections:
• • •

How LDAP Attribute Maps Work, page 2 LDAP Attribute Map Configuration Examples, page 3 Supported Cisco Attributes for LDAP Authorization, page 25

Americas Headquarters: Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA

How LDAP Attribute Maps Work

How LDAP Attribute Maps Work
LDAP is a powerful and flexible protocol for communication with AAA servers. LDAP attribute maps provide a method to cross-reference the attributes retrieved from a directory server to Cisco attributes supported by the security appliance. When a user authenticates to the security appliance, the security appliance, in turn, authenticates to the server and uses the LDAP protocol to retrieve the record for that user. The record consists of LDAP attributes associated with fields displayed on the user interface of the server. Each attribute retrieved includes a value that was entered by the admin who updates the user records. Figure 1 shows the Properties window displayed by Microsoft AD for a single user. We have entered Chicago in the Office field, which uses the attribute physicalDeliveryOfficeName. Therefore, when the security appliance retrieves the LDAP record from the server, it includes the attribute physicalDeliveryOfficeName, and its value Chicago. Unlike support for RADIUS, the security appliance has no hard-coded information about the LDAP attributes it retrieves. You must create an attribute map that maps each LDAP attribute to a Cisco attribute.
Figure 1 LDAP User Properties Window

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LDAP Attribute Map Configuration Examples

LDAP Attribute Map Configuration Examples
The following sections provide configuration examples for creating attribute maps:
• • • • •

User-Based Attributes Policy Enforcement Placing Users in a Specific Group-Policy Enforcing Static IP Address Assignment for AnyConnect Tunnels Enforcing Dial-in Allow or Deny Access Enforcing Logon Hours and Time-of-Day Rules

User-Based Attributes Policy Enforcement
In this example, we configure the security appliance to enforce a simple banner for a user configured on an AD LDAP server. On the server, we use the Office field in the General tab to enter the banner text. This field uses the attribute named physicalDeliveryOfficeName. On the security appliance, we create an attribute map that maps physicalDeliveryOfficeName to the Cisco attribute Banner1. During authentication, the security appliance retrieves the value of physicalDeliveryOfficeName from the server, maps the value to the Cisco attribute Banner1, and displays the banner to the user. This example applies to any VPN connection type, including the IPSec client, AnyConnect SSL client, or clientless SSL. For our example, User1 is connecting through a clientless SSL connection.
Step 1

Configure the attributes for a user on the AD/LDAP server. Right-click a user. The Properties window displays (Figure 2). Click the General tab and enter some banner text in the Office field. The Office field uses AD/LDAP attribute physicalDeliveryOfficeName.
Figure 2 LDAP User configuration

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LDAP Attribute Map Configuration Examples

Step 2

Create an LDAP attribute map on the security appliance: In Figure 3, we create the map Banner, and map the AD/LDAP attribute physicalDeliveryOfficeName to the Cisco attribute Banner1:
Figure 3 Create an LDAP Attribute Map

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LDAP Attribute Map Configuration Examples

Step 3

Associate the LDAP attribute map to the AAA server. In Figure 4, we select the server group MS_LDAP, and the host 3.3.3.4 in that group, and click Edit. Then we enter Banner as the LDAP Attribute Map:
Figure 4 Associate the LDAP Attribute Map to the AAA Server

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LDAP Attribute Map Configuration Examples

Figure 5 shows the banner enforced by our attribute map:
Figure 5 Banner Displayed

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LDAP Attribute Map Configuration Examples

Placing Users in a Specific Group-Policy
In this example, we authenticate User1 on the AD LDAP server to a specific group policy on the security appliance. On the server, we use the Department field of the Organization tab to enter the name of the group policy. Then we create an attribute map and map Department to the Cisco attribute IETF-Radius-Class. During authentication, the security appliance retrieves the value of Department from the server, maps the value to the IETF-Radius-Class, and places User1 in the group policy. This case applies to any VPN connection type, including the IPSec client, AnyConnect SSL client, or clientless SSL. For this example, user1 is connecting through a clientless SSL connection.
Step 1

Configure the attributes for the user on the AD LDAP Server. Right-click the user. The Properties window displays (Figure 6). Click the Organization tab and enter Group-Policy-1 in the Department field.
Figure 6 AD LDAP Department attribute

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LDAP Attribute Map Configuration Examples

Step 2

Create an attribute map for the LDAP configuration shown in Step 1. In Figure 7 we create the map named group_policy and we map the AD attribute Department to the Cisco attribute IETF-Radius-Class:
Figure 7 Create an Attribute Map

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LDAP Attribute Map Configuration Examples

Step 3

Associate the LDAP attribute map to the AAA server. In Figure 8 we select host 3.3.3.4, in the AAA server group MS_LDAP, and enter the name of our attribute map, group_policy:
Figure 8 Associate the LDAP Attribute Map to the AAA Server

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LDAP Attribute Map Configuration Examples

Step 4

Add the new group-policy on the security appliance and configure the required policy attributes that will be assigned to the user. In Figure 9 we create the group policy group-policy-1, the name entered in the Department field on the server:
Figure 9 Create a Group Policy

You can use CLI to monitor the communication between the security appliance and the server by enabling the debug ldap 255 command from privileged EXEC mode. Below is sample output of this command. The output has been edited to provide the key messages: [29] Authentication successful for user1 to 3.3.3.4 [29] Retrieving user attributes from server 3.3.3.4 [29] Retrieved Attributes: [29] department: value = Group-Policy-1 [29] mapped to IETF-Radius-Class: value = Group-Policy-1

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LDAP Attribute Map Configuration Examples

Enforcing Static IP Address Assignment for AnyConnect Tunnels
In this example, we configure the AnyConnect client user Web1 to receive a static IP Address. We enter the address in the Assign Static IP Address field of the Dialin tab on the AD LDAP server. This field uses the msRADIUSFramedIPAddress attribute. We create an attribute map that maps it to the Cisco attribute IETF-Radius-Framed-IP-Address. During authentication, the security appliance retrieves the value of msRADIUSFramedIPAddress from the server, maps the value to the Cisco attribute IETF-Radius-Framed-IP-Address, and provides the static address to User1. This example applies to full-tunnel clients, including the IPSec client and the SSL VPN clients (AnyConnect client 2.x and the legacy SSL VPN client).
Step 1

Configure the user attributes on the AD LDAP server. Right-click on the user name. The Properties window displays (Figure 10). Click the Dialin tab, check Assign Static IP Address, and enter an IP address. For our example, we use 3.3.3.233.
Figure 10 Assign Static IP Address

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LDAP Attribute Map Configuration Examples

Step 2

Create an attribute map for the LDAP configuration shown in Step 1. In this case we map the AD attribute msRADIUSFrameIPAddress used by the Static Address field to the Cisco attribute IETF-Radius-Framed-IP-Address.
Figure 11 Create an Attribute Map

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LDAP Attribute Map Configuration Examples

Step 3

Associate the LDAP attribute map to the AAA server. In Figure 12 we select the host 3.3.3.4, in the AAA server group MS_LDAP, and associate the attribute map static_address:
Figure 12 Associate the LDAP Attribute Map to the AAA Server

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LDAP Attribute Map Configuration Examples

If you establish a connection to the security appliance with the AnyConnect client, you can observe the following:
• •

The banner is received in the same sequence as a clientless connection (Figure 13). The user receives the IP address configured on the server and mapped to the security appliance (Figure 14).
Verify the Banner for the AnyConnect Session

Figure 13

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LDAP Attribute Map Configuration Examples

Figure 14

AnyConnect Session Established

You can use CLI to view the session details and verify the address assigned using the show vpn-sessiondb svc command:
hostname# show vpn-sessiondb svc Session Type: SVC Username : web1 Index Assigned IP : 3.3.3.233 Public IP Protocol : Clientless SSL-Tunnel DTLS-Tunnel Encryption : RC4 AES128 Hashing Bytes Tx : 304140 Bytes Rx Group Policy : VPN_User_Group Tunnel Group Login Time : 11:13:05 UTC Tue Aug 28 2007 Duration : 0h:01m:48s NAC Result : Unknown VLAN Mapping : N/A VLAN BXB-ASA5540#

: 31 : 10.86.181.70 : SHA1 : 470506 : UseCase3_TunnelGroup

: none

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LDAP Attribute Map Configuration Examples

Enforcing Dial-in Allow or Deny Access
In this example, we create an LDAP attribute map that specifies the tunneling protocols allowed for the user. We map the Allow Access and Deny Access settings on the Dialin tab to the Cisco attribute Tunneling-Protocols. The Cisco Tunneling-Protocols supports the map values shown in Table 1:
Table 1 Bitmap Values for Cisco Tunneling-Protocol Attribute

Map Value 1 2 4 8
1 2

Tunneling Protocol PPTP L2TP IPSec L2TP/IPSEC clientless SSL SSL Client—AnyConnect or legacy SSL VPN client

16 32

1. IPSec and L2TP over IPSec are not supported simultaneously. Therefore, the values 4 and 8 are mutually exclusive. 2. See note 1.

Using this attribute, we create an Allow Access (TRUE) or a Deny (FALSE) condition for the protocols and enforce what method the user is allowed access with. For this simplified example, by mapping the tunnel-protocol IPSec (4), we can create an allow (true) condition for the IPSec Client. We also map WebVPN (16) and SVC/AC (32) which is mapped as value of 48 (16+32) and create a deny (false) condition. This allows the user to connect to the security appliance using IPSec, but any attempt to connect using clientless SSL or the AnyConnect client is denied.

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LDAP Attribute Map Configuration Examples

Step 1

Configure the user attributes on the AD LDAP server. Right-click on the user. The Properties window displays. Click the Dial-in tab. Select Allow Access (Figure 16).
Figure 15 Configure the User Attributes on the AD LDAP Server

Note

If you select Control access through Remote Access Policy, a value is not returned from the server and the permissions are enforced based on the internal group policy settings.

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LDAP Attribute Map Configuration Examples

Step 2

Create an attribute map to allow both an IPSec and AnyConnect connection, but deny a clientless SSL connection. In Figure 16 we create the map tunneling_protocols, and enter map values for the AD attribute msNPAllowDialin used by the Allow Access setting to the Cisco attribute Tunneling-Protocols:
Figure 16 Create an Attribute Map

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LDAP Attribute Map Configuration Examples

Step 3

Associate the LDAP attribute map to the AAA server. In Figure 17 we edit the AAA server settings for the host 3.3.3.4, in the AAA server group MS_LDAP, and associate the attribute map tunneling_protocols that we created in step 2:
Figure 17 Associate the LDAP Attribute Map to the AAA Server

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LDAP Attribute Map Configuration Examples

If you connect to the security appliance using a PC as a remote user would, a clientless or AnyConnect connection fails and the user is informed that an unauthorized connection mechanism was the reason for the failed connection (Figure 18 and Figure 19). An IPSec client connects because IPSec is an allowed tunneling protocol according to attribute map.
Figure 18 Login Denied Message for Clientless User

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Figure 19

Login Denied Message for AnyConnect Client User.

Enforcing Logon Hours and Time-of-Day Rules
In this example, we configure and enforce the hours that a clientless SSL user is allowed to access the network. A good example of this is when you want to allow a business partner access to the network only during normal business hours. For our example, on the AD server, we use the Office field to enter the name of the partner. This field uses the physicalDeliveryOfficeName attribute. Then we create an attribute map on the security appliance to map that attribute to the Cisco attribute Access-Hours. During authentication, the security appliance retrieves the value of physicalDeliveryOfficeName (the Office field) and maps it to Access-Hours.
Step 1

Configure the user attributes on the AD LDAP server. Select the user. Right click on Properties. The Properties window displays (Figure 20). Enter the partner name in the Office field of the General tab:

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LDAP Attribute Map Configuration Examples

Figure 20

Active Directory - Time-range

Step 2

Create an attribute map. In this example, we create the attribute map access_hours and map the AD attribute physicalDeliveryOfficeName used by the Office field to the Cisco attribute Access-Hours.
Figure 21 Create an Attribute Map

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LDAP Attribute Map Configuration Examples

Step 3

Associate the LDAP attribute map to the AAA server. In Figure 22 we edit the AAA server configuration host 3.3.3.4, in the AAA server group MS_LDAP, and associate the attribute map access_hours that we created in step 2:
Figure 22 Associate the LDAP Attribute Map to the AAA Server

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LDAP Attribute Map Configuration Examples

Step 4

Configure time ranges for each value allowed on the server. In this case, we entered Partner in the Office field for User1. Therefore, there must be a time range configured for Partner. In Figure 23 we configure Partner access hours from 9am to 5pm Monday through Friday:
Figure 23 Configure Time Ranges for Each Value Allowed on the Server

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Supported Cisco Attributes for LDAP Authorization

Supported Cisco Attributes for LDAP Authorization
This section provides a complete list of attributes (Table 2) for the ASA 5500, VPN 3000, and PIX 500 series security appliances. The table includes attribute support information for the VPN 3000 and PIX 500 series to assist you in configuring networks with a mixture of these security appliances.
Table 2 Security Appliance Supported Cisco Attributes for LDAP Authorization

Attribute Name/ Access-Hours Allow-Network-Extension- Mode Authenticated-User-Idle- Timeout Authorization-Required Authorization-Type

VPN 3000 ASA PIX Y Y Y Y Y Y Y Y Y Y Y

Syntax/ Type String

Single or Multi-Valued Possible Values Single Name of the time-range (for example, Business-Hours) 0 = Disabled 1 = Enabled 1 - 35791394 minutes 0 = No 1 = Yes 0 = None 1 = RADIUS 2 = LDAP Banner string Banner string An octet string in the following format: [Prefix] [Action] [Protocol] [Source] [Source Wildcard Mask] [Destination] [Destination Wildcard Mask] [Established] [Log] [Operator] [Port] For more information, see “Cisco-AV-Pair Attribute Syntax.”

Boolean Single Integer Integer Integer Single Single Single

Auth-Service-Type Banner1 Banner2 Cisco-AV-Pair Y Y Y Y Y Y Y Y Y String String String Single Single Multi

Cisco-IP-Phone-Bypass Cisco-LEAP-Bypass Client-Intercept-DHCPConfigure-Msg Client-Type-Version-Limiting Confidence-Interval DHCP-Network-Scope DN-Field

Y Y Y Y Y Y Y

Y Y Y Y Y Y Y

Y Y Y Y Y Y Y

Integer Integer

Single Single

0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled IPSec VPN client version number string 10 - 300 seconds IP address Possible values: UID, OU, O, CN, L, SP, C, EA, T, N, GN, SN, I, GENQ, DNQ, SER, use-entire-name.

Boolean Single String Integer String String Single Single Single Single

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Supported Cisco Attributes for LDAP Authorization

Table 2

Security Appliance Supported Cisco Attributes for LDAP Authorization (continued)

Attribute Name/ Firewall-ACL-In Firewall-ACL-Out IE-Proxy-Bypass-Local IE-Proxy-Exception-List

VPN 3000 ASA PIX Y Y Y Y

Syntax/ Type String String

Single or Multi-Valued Possible Values Single Single Access list ID Access list ID 0=Disabled 1=Enabled A list of DNS domains. Entries must be separated by the new line character sequence (\n). 1 = Do not modify proxy settings 2 = Do not use proxy 3 = Auto detect 4 = Use security appliance setting IP Address Sets the group policy for the remote access VPN session access list name that is defined on the security appliance An IP address An IP address mask minutes

Boolean Single String Single

IE-Proxy-Method

Y

Y

Y

Integer

Single

IE-Proxy-Server IETF-Radius-Class IETF-Radius-Filter-Id IETF-Radius-Framed-IP-Address IETF-Radius-Framed-IP-Netmask IETF-Radius-Idle-Timeout IETF-Radius-Service-Type IETF-Radius-Session-Timeout IKE-Keep-Alives IPSec-Allow-Passwd-Store IPSec-Authentication

Y Y Y Y Y Y Y Y Y Y Y

Y Y Y Y Y Y Y Y Y Y Y

Y Y Y Y Y Y Y Y Y Y Y

Integer

Single Single

String String String Integer Integer Integer

Single Single Single Single Single Single

Boolean Single Boolean Single Integer Single

0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled 0 = None 1 = RADIUS 2 = LDAP (authorization only) 3 = NT Domain 4 = SDI (RSA) 5 = Internal 6 = RADIUS with Expiry 7 = Kerberos/Active Directory 0 = Disabled 1 = Enabled Server Addresses (space delimited) 1 = Use Client-Configured list 2 = Disabled and clear client list 3 = Use Backup Server list

IPSec-Auth-On-Rekey IPSec-Backup-Server-List IPSec-Backup-Servers

Y Y Y

Y Y Y

Y Y Y

Boolean Single String String Single Single

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Table 2

Security Appliance Supported Cisco Attributes for LDAP Authorization (continued)

Attribute Name/

VPN 3000 ASA PIX

Syntax/ Type String

Single or Multi-Valued Possible Values Single Specifies the name of the filter to be pushed to the client as firewall policy. 0 = Required 1 = Optional Specifies the single default domain name to send to the client (1 - 255 characters). 1 = Required 2 = If supported by peer certificate 3 = Do not check 0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled 4001 - 49151; default = 10000 0 = None 1 = Policy defined by remote FW Are-You-There (AYT) 2 = Policy pushed CPP 4 = Policy from server Name of the security association Specifies the list of secondary domain names to send to the client (1 - 255 characters). 0 = Tunnel everything 1 = Split tunneling 2 = Local LAN permitted Specifies the name of the network or access list that describes the split tunnel inclusion list. 1 = LAN-to-LAN 2 = Remote access 0 = Disabled 1 = Enabled

IPSec-Client-Firewall-Filter- Name Y

IPSec-Client-Firewall-FilterOptional IPSec-Default-Domain

Y Y

Y Y

Y Y

Integer String

Single Single

IPSec-IKE-Peer-ID-Check

Y

Y

Y

Integer

Single

IPSec-IP-Compression IPSec-Mode-Config IPSec-Over-UDP IPSec-Over-UDP-Port IPSec-Required-Client-FirewallCapability

Y Y Y Y Y

Y Y Y Y Y

Y Y Y Y Y

Integer

Single

Boolean Single Boolean Single Integer Integer Single Single

IPSec-Sec-Association IPSec-Split-DNS-Names

Y Y Y Y

String String

Single Single

IPSec-Split-Tunneling-Policy

Y

Y

Y

Integer

Single

IPSec-Split-Tunnel-List

Y

Y

Y

String

Single

IPSec-Tunnel-Type IPSec-User-Group-Lock

Y Y

Y

Y

Integer

Single

Boolean Single

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Supported Cisco Attributes for LDAP Authorization

Table 2

Security Appliance Supported Cisco Attributes for LDAP Authorization (continued)

Attribute Name/ L2TP-Encryption

VPN 3000 ASA PIX Y

Syntax/ Type Integer

Single or Multi-Valued Possible Values Single Bitmap: 1 = Encryption required 2 = 40 bit 4 = 128 bits 8 = Stateless-Req 15 = 40/128-Encr/Stateless-Req

L2TP-MPPC-Compression MS-Client-Subnet-Mask PFS-Required Port-Forwarding-Name PPTP-Encryption

Y Y Y Y Y Y Y Y Y Y

Integer String

Single Single

0 = Disabled 1 = Enabled An IP address 0 = No 1 = Yes Name string (for example, “Corporate-Apps”) Bitmap: 1 = Encryption required 2 = 40 bits 4 = 128 bits 8 = Stateless-Required Example: 15 = 40/128-Encr/Stateless-Req

Boolean Single String Integer Single Single

PPTP-MPPC-Compression Primary-DNS Primary-WINS Privilege-Level Required-ClientFirewall-Vendor-Code

Y Y Y Y Y Y Y

Integer String String

Single Single Single

0 = Disabled 1 = Enabled An IP address An IP address

Y

Y

Y

Integer

Single

1 = Cisco Systems (with Cisco Integrated Client) 2 = Zone Labs 3 = NetworkICE 4 = Sygate 5 = Cisco Systems (with Cisco Intrusion Prevention Security Agent) String

Required-Client-FirewallDescription

Y

Y

Y

String

Single

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Table 2

Security Appliance Supported Cisco Attributes for LDAP Authorization (continued)

Attribute Name/ Required-Client-FirewallProduct-Code

VPN 3000 ASA PIX Y Y Y

Syntax/ Type Integer

Single or Multi-Valued Possible Values Single Cisco Systems Products: 1 = Cisco Intrusion Prevention Security Agent or Cisco Integrated Client (CIC) Zone Labs Products: 1 = Zone Alarm 2 = Zone AlarmPro 3 = Zone Labs Integrity NetworkICE Product: 1 = BlackIce Defender/Agent Sygate Products: 1 = Personal Firewall 2 = Personal Firewall Pro 3 = Security Agent

Require-HW-Client-Auth Require-Individual-User-Auth Secondary-DNS Secondary-WINS SEP-Card-Assignment Simultaneous-Logins Strip-Realm TACACS-Authtype TACACS-Privilege-Level Tunnel-Group-Lock Tunneling-Protocols

Y Y Y Y Y Y Y Y Y

Y Y Y Y Y Y Y Y Y Y

Y Y Y Y Y Y Y Y Y Y

Boolean Single Integer String String Integer Integer Single Single Single Single Single

0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled An IP address An IP address Not used 0-2147483647 0 = Disabled 1 = Enabled

Boolean Single Interger Single Interger Single String Integer Single Single

Name of the tunnel group or “none” 1 = PPTP 2 = L2TP 4 = IPSec 8 = L2TP/IPSec 16 = WebVPN. 8 and 4 are mutually exclusive (0 - 11, 16 - 27 are legal values) 0 = Disabled 1 = Enabled IP address or hostname Port number for server protocol Server password Access-List name

Use-Client-Address User-Auth-Server-Name User-Auth-Server-Port User-Auth-Server-Secret WebVPN-ACL-Filters

Y Y Y Y Y

Boolean Single String Integer String String Single Single Single Single

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Table 2

Security Appliance Supported Cisco Attributes for LDAP Authorization (continued)

Attribute Name/ WebVPN-Apply-ACL-Enable WebVPN-Citrix-Support-Enable WebVPN-Content-FilterParameters

VPN 3000 ASA PIX Y Y Y Y Y Y

Syntax/ Type Integer Integer Integer

Single or Multi-Valued Possible Values Single Single Single 0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled 1 = Java & ActiveX 2 = Java scripts 4 = Images 8 = Cookies in images Add the values to filter multiple parameters. For example: enter 10 to filter both Java scripts and cookies. (10 = 2 + 8)

WebVPN-Enable-functions WebVPN-Exchange-ServerAddress WebVPN-Exchange-ServerNETBIOS-Name WebVPN-File-Access-Enable WebVPN-File-Server-BrowsingEnable WebVPN-File-Server-EntryEnable WebVPN-Forwarded-Ports WebVPN-Homepage WebVPN-Macro-SubstitutionValue1 WebVPN-Macro-SubstitutionValue2 WebVPN-Port-ForwardingAuto-Download-Enable WebVPN-Port-Forwarding- Enable WebVPN-Port-ForwardingExchange-Proxy-Enable WebVPN-Port-ForwardingHTTP-Proxy-Enable WebVPN-Single-Sign-OnServer-Name Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y

Integer String String Integer Integer Integer String String String String Integer Integer Integer Integer String

Single Single Single Single Single Single Single Single Single Single Single Single Single Single Single

Not used - deprecated Not used - deprecated Not used - deprecated 0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled Port-Forward list name A URL such as http://example-portal.com.

0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled Name of the SSO Server (1 - 31 characters).

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Table 2

Security Appliance Supported Cisco Attributes for LDAP Authorization (continued)

Attribute Name/ WebVPN-SVC-Client-DPD

VPN 3000 ASA PIX Y Y

Syntax/ Type Integer

Single or Multi-Valued Possible Values Single 0 = Disabled n = Dead Peer Detection value in seconds (30 - 3600) 0 = None 1 = Deflate Compression 0 = Disabled 1 = Enabled 0 = Disabled n = Dead Peer Detection value in seconds (30 - 3600) 0 = Disabled n = Keepalive value in seconds (15 600) 0 = Disabled 1 = Enabled 0 = None 1 = SSL 2 = New tunnel 3 = Any (sets to SSL) 0 = Disabled n = Retry period in minutes (4 - 10080) 0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled URL-list name

WebVPN-SVC-Compression WebVPN-SVC-Enable WebVPN-SVC-Gateway-DPD

Y Y Y

Y Y Y

Integer Integer Integer

Single Single Single

WebVPN-SVC-Keepalive

Y

Y

Integer

Single

WebVPN-SVC-Keep-Enable WebVPN-SVC-Rekey-Method

Y Y

Y Y

Integer Integer

Single Single

WebVPN-SVC-Rekey-Period

Y

Y

Integer

Single

WebVPN-SVC-Required-Enable WebVPN-URL-Entry-Enable WebVPN-URL-List

Y Y

Y Y Y

Integer Integer String

Single Single Single

Cisco-AV-Pair Attribute Syntax
The syntax of each Cisco-AV-Pair rule is as follows: [Prefix] [Action] [Protocol] [Source] [Source Wildcard Mask] [Destination] [Destination Wildcard Mask] [Established] [Log] [Operator] [Port] Table 3 describes the syntax rules.
Table 3 AV-Pair Attribute Syntax Rules

Field Prefix

Description A unique identifier for the AV pair. For example: ip:inacl#1= (for standard access lists) or webvpn:inacl# (for clientless SSL VPN access lists). This field only appears when the filter has been sent as an AV pair. Action to perform if rule matches: deny, permit.

Action

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Table 3

AV-Pair Attribute Syntax Rules

Field Protocol Source

Description Number or name of an IP protocol. Either an integer in the range 0 - 255 or one of the following keywords: icmp, igmp, ip, tcp, udp. Network or host that sends the packet. Specify it as an IP address, a hostname, or the keyword “any.” If using an IP address, the source wildcard mask must follow. The wildcard mask that applies to the source address. Network or host that receives the packet. Specify as an IP address, a hostname, or the keyword “any.” If using an IP address, the source wildcard mask must follow. The wildcard mask that applies to the destination address. Generates a FILTER log message. You must use this keyword to generate events of severity level 9. Logic operators: greater than, less than, equal to, not equal to. The number of a TCP or UDP port in the range 0 - 65535.

Source Wildcard Mask Destination

Destination Wildcard Mask Log Operator Port For example:

ip:inacl#1=deny ip 10.155.10.0 0.0.0.255 10.159.2.0 0.0.0.255 log ip:inacl#2=permit TCP any host 10.160.0.1 eq 80 log webvpn:inacl#1=permit url http://www.website.com webvpn:inacl#2=deny smtp any host 10.1.3.5 webvpn:inacl#3=permit url cifs://mar_server/peopleshare1

Note

Use Cisco-AV pair entries with the ip:inacl# prefix to enforce access lists for remote IPSec and SSL VPN Client (SVC) tunnels. Use Cisco-AV pair entries with the webvpn:inacl# prefix to enforce access lists for SSL VPN clientless (browser-mode) tunnels. Table 4 lists the tokens for the Cisco-AV-pair attribute:

Table 4

Security Appliance-Supported Tokens

Token ip:inacl#Num= webvpn:inacl#Num= deny permit icmp 1

Syntax Field N/A (Identifier) N/A (Identifier) Action Action Protocol Protocol

Description (Where Num is a unique integer.) Starts all AV pair access control lists. Enforces access lists for remote IPSec and SSL VPN (SVC) tunnels. (Where Num is a unique integer.) Starts all clientless SSL AV pair access control lists. Enforces access lists for clientless (browser-mode) tunnels. Denies action. (Default) Allows action. Internet Control Message Protocol (ICMP) Internet Control Message Protocol (ICMP)

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Table 4

Security Appliance-Supported Tokens

Token IP 0 TCP 6 UDP 17 any host log lt gt eq neq range

Syntax Field Protocol Protocol Protocol Protocol Protocol Protocol Hostname Hostname Log Operator Operator Operator Operator Operator

Description Internet Protocol (IP) Internet Protocol (IP) Transmission Control Protocol (TCP) Transmission Control Protocol (TCP) User Datagram Protocol (UDP) User Datagram Protocol (UDP) Rule applies to any host. Any alpha-numeric string that denotes a hostname. When the event is hit, a filter log message appears. (Same as permit and log or deny and log.) Less than value Greater than value Equal to value Not equal to value Inclusive range. Should be followed by two values.

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