Cisco ASA Series SSL VPN CLI Configuration Guide
The Cisco ASA Series SSL VPN is a secure and reliable way to connect remote users to your internal network. It allows users to access internal resources such as applications, files, and desktops. The ASA Series SSL VPN is easy to configure and manage. It also offers a variety of features to help you improve security and performance.
Advertisement
Advertisement
Basic Clientless SSL VPN Configuration
•
•
Switch Off URL Entry on the Portal Page, page 2
•
Trusted Certificate Pools, page 2
•
Configure Browser Access to Plug-ins, page 3
•
Configure Port Forwarding, page 8
•
Configure File Access, page 14
•
Ensure Clock Accuracy for SharePoint Access, page 16
•
Virtual Desktop Infrastructure (VDI), page 17
•
Use SSL to Access Internal Servers, page 20
•
Configure Browser Access to Client-Server Plug-ins, page 24
Rewrite Each URL
By default, the ASA allows all portal traffic to all Web resources (for example HTTPS, CIFS, RDP, and plug-ins). Clientless SSL VPN rewrites each URL to one that is meaningful only to the ASA. The user cannot use this URL to confirm that they are connected to the website they requested. To avoid placing users at risk from phishing websites, assign a Web ACL to the policies configured for clientless access—group policies,
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
1
Basic Clientless SSL VPN Configuration
Switch Off URL Entry on the Portal Page
dynamic access policies, or both—to control traffic flows from the portal. We recommend switching off URL
Entry on these policies to prevent user confusion over what is accessible.
Figure 1: Example URL Entered by User
Figure 2: Same URL Rewritten by Security Appliance and Displayed in Browser Window
Switch Off URL Entry on the Portal Page
The portal page opens when the user establishes a browser-based connection.
Before You Begin
Configure a group policy for all users who require Clientless SSL VPN access, and enable Clientless SSL
VPN only for that group policy.
Procedure
Step 1
Switch to group policy clientless ssl vpn configuration mode.
webvpn
Step 2
Control the ability of the user to enter any HTTP/HTTPS URL.
url-entry
Step 3
(Optional) Switch off URL Entry.
url-entry disable
Trusted Certificate Pools
The ASA groups trusted certificates into trustpools. Trustpools can be thought of as a special case of Trustpoint representing multiple known CA certificates. The ASA includes a default bundle of certificates, similar to the bundle of certificates provided with web browsers. Those certificates are inactive until activated by the administrator by issuing the crypto ca import default command.
2
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Edit the Policy of the Trusted Certificate Pool
When connecting to a remote server with a web browser using the HTTPS protocol, the server provides a digital certificate signed by a certificate authority (CA) to identify itself. Web browsers include a collection of CA certificates which are used to verify the validity of the server certificate.
When connecting to a remote SSL-enabled server through Clientless SSL VPN, it is important to know that you can trust the remote server, and that you are connecting to the correct remote server. ASA 9.0 introduced support for SSL server certificate verification against a list of trusted certificate authority (CA) certificates for Clientless SSL VPN.
On Configuration > Remote Access VPN > Certificate Management > Trusted Certificate Pool, you can enable certificate verification for SSL connections to https sites. You can also manage the certificates in the trusted certificate pool.
Note
ASA trustpools are similar to but not identical to Cisco IOS trustpools.
Edit the Policy of the Trusted Certificate Pool
Procedure
Step 1
Revocation Check—Configure whether to check the certificates in the pool for revocation, and then choose whether to use CLR or OCSP and whether to make the certificate invalid if checking for revocation fails.
Step 2
Certificate Matching Rules—Select certificate maps to exempt from revocation or expiration checks. A certificate map links certificates to AnyConnect or clientless SSL connection profiles (also known as tunnel groups).
Step 3
CRL Options—Decide how often to refresh the CRL cache, between 1 and 1440 minutes (1140 minutes is
24 hours).
Configure Browser Access to Plug-ins
A browser plug-in is a separate program that a Web browser invokes to perform a dedicated function, such as connect a client to a server within the browser window. The ASA lets you import plug-ins for download to remote browsers in Clientless SSL VPN sessions. Of course, Cisco tests the plug-ins it redistributes, and in some cases, tests the connectivity of plug-ins we cannot redistribute. However, we do not recommend importing plug-ins that support streaming media at this time.
The ASA does the following when you install a plug-in onto the flash device:
• (Cisco-distributed plug-ins only) Unpacks the jar file specified in the URL.
• Writes the file to the ASA file system.
• Populates the drop-down list next to the URL attributes in ASDM.
• Enables the plug-in for all future Clientless SSL VPN sessions, and adds a main menu option and an option to the drop-down list next to the Address field of the portal page.
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
3
Basic Clientless SSL VPN Configuration
Prerequisites with Plug-Ins
The following shows the changes to the main menu and Address field of the portal page when you add the plug-ins described in the following sections.
Table 1: Effects of Plug-ins on the Clientless SSL VPN Portal Page
Plug-in
ica rdp rdp2* vnc
Main Menu Option Added to Portal Page
Citrix MetaFrame Services
Terminal Servers
Terminal Servers Vista ssh,telnet Secure Shell
Telnet Services (supporting v1 and v2)
Virtual Network Computing services
Address Field Option Added to Portal Page
ica:// rdp:// rdp2:// ssh:// telnet:// vnc://
* Not a recommended plug-in.
When the user in a Clientless SSL VPN session clicks the associated menu option on the portal page, the portal page displays a window to the interface and displays a help pane. The user can choose the protocol displayed in the drop-down list and enter the URL in the Address field to establish a connection.
The plug-ins support single sign-on (SSO).
Prerequisites with Plug-Ins
• Clientless SSL VPN must be enabled on the ASA to provide remote access to the plug-ins.
• To configure SSO support for a plug-in, you install the plug-in, add a bookmark entry to display a link to the server, and specify SSO support when adding the bookmark.
• The minimum access rights required for remote use belong to the guest privilege mode.
• Plug-ins require ActiveX or Oracle Java Runtime Environment (JRE). See the Supported VPN Platforms,
Cisco ASA 5500 Series compatibility matrices for version requirements.
Restrictions with Plug-Ins
Note
The remote desktop protocol plug-in does not support load balancing with a session broker. Because of the way the protocol handles the redirect from the session broker, the connection fails. If a session broker is not used, the plug-in works.
• The plug-ins support single sign-on (SSO). They use the same credentials entered to open the Clientless
SSL VPN session. Because the plug-ins do not support macro substitution, you do not have the options
4
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Prepare the Security Appliance for a Plug-in
to perform SSO on different fields such as the internal domain password or on an attribute on a RADIUS or LDAP server.
• A stateful failover does not retain sessions established using plug-ins. Users must reconnect following a failover.
• If you use stateless failover instead of stateful failover, clientless features such as bookmarks, customization, and dynamic access-policies are not synchronized between the failover ASA pairs. In the event of a failover, these features do not work.
Prepare the Security Appliance for a Plug-in
Before You Begin
Ensure that Clientless SSL VPN is enabled on an ASA interface.
Do not specify an IP address as the common name (CN) for the SSL certificate. The remote user attempts to use the FQDN to communicate with the ASA. The remote PC must be able to use DNS or an entry in the
System32\drivers\etc\hosts file to resolve the FQDN.
Procedure
Step 1
Show whether Clientless SSL VPN is enabled on the ASA.
show running-config
Step 2
Install an SSL certificate onto the ASA interface and provide a fully-qualified domain name (FQDN) for remote user connection.
Install Plug-ins Redistributed by Cisco
Cisco redistributes the following open-source, Java-based components to be accessed as plug-ins for Web browsers in Clientless SSL VPN sessions.
Before You Begin
Ensure Clientless SSL VPN is enabled on an interface on the ASA. To do so, enter the show running-config command.
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
5
Basic Clientless SSL VPN Configuration
Install Plug-ins Redistributed by Cisco
Table 2: Plug-ins Redistributed by Cisco
Protocol Description
RDP Accesses Microsoft Terminal Services hosted by Windows
Vista and Windows 2003 R2.
Supports Remote Desktop ActiveX Control.
We recommend using this plug-in that supports both RDP and RDP2. Only versions up to 5.1 of the RDP and RDP2 protocols are supported. Version 5.2 and later are not supported.
Source of Redistributed Plug-in *
http://properjavardp.sourceforge.net/
RDP2 Accesses Microsoft Terminal Services hosted by Windows
Vista and Windows 2003 R2.
Supports Remote Desktop ActiveX Control.
This legacy plug-in supports only RDP2. We do not recommend using this plug-in; instead, use the RDP plug-in above.
SSH The Secure Shell-Telnet plug-in lets the remote user establish a Secure Shell (v1 or v2) or Telnet connection to a remote computer.
Because keyboard-interactive authentication is not supported by JavaSSH, it cannot be supported with SSH plugin (used to implement different authentication mechanisms).
http://javassh.org/
VNC The Virtual Network Computing plug-in lets the remote user use a monitor, keyboard, and mouse to view and control a computer with remote desktop sharing (also known as VNC server or service) turned on. This version changes the default color of the text and contains updated
French and Japanese help files.
http://www.tightvnc.com/
* Consult the plug-in documentation for information on deployment configuration and restrictions.
These plug-ins are available on the Cisco Adaptive Security Appliance Software Download site.
Note
The ASA does not retain the import webvpn plug-in protocol command in the configuration. Instead, it loads the contents of the csco-config/97/plugin directory automatically. A secondary ASA obtains the plug-ins from the primary ASA.
Procedure
Step 1
Install the plug-in onto the flash device of the ASA.
6
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Provide Access to a Citrix XenApp Server
import webvpn plug-in protocol [ rdp | rdp2 | [ ssh | telnet ] | vnc] URL
Note
Do not enter this command once for SSH and once for Telnet. When typing ssh,telnet , do not insert a space. This provides plug-in access to both Secure Shell and Telnet services.
Example:
The following example shows entering the hostname or address of the TFTP or FTP server and the path to the plug-in, where URL is the remote path to the plug-in .jar file.
hostname#
import webvpn plug-in protocol ssh,telnet tftp://local_tftp_server/plugins/ssh-plugin.jar
Accessing tftp://local_tftp_server/plugins/ssh-plugin.jar...!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Writing file disk0:/csco_config/97/plugin/ssh...
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
238510 bytes copied in 3.650 secs (79503 bytes/sec)
Step 2
(Optional) Switch off and remove Clientless SSL VPN support for a plug-in, as well as removing it from the flash drive of the ASA.
revert webvpn plug-in protocol protocol
Example:
hostname#
revert webvpn plug-in protocol rdp
Provide Access to a Citrix XenApp Server
As an example of how to provide Clientless SSL VPN browser access to third-party plug-ins, this section describes how to add Clientless SSL VPN support for the Citrix XenApp Server Client.
With a Citrix plug-in installed on the ASA, Clientless SSL VPN users can use a connection to the ASA to access Citrix XenApp services.
A stateful failover does not retain sessions established using the Citrix plug-in. Citrix users must reauthenticate after failover.
Create and Install the Citrix Plug-in
Before You Begin
You must prepare the security application for a plug-in.
You must configure the Citrix Web Interface software to operate in a mode that does not use the (Citrix)
“secure gateway.” Otherwise, the Citrix client cannot connect to the Citrix XenApp Server.
Procedure
Step 1
Download the ica-plugin.zip
file from the Cisco Software Download website.
This file contains files that Cisco customized for use with the Citrix plug-in.
Step 2
Download the Citrix Java client from the Citrix site.
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
7
Basic Clientless SSL VPN Configuration
View the Plug-ins Installed on the Security Appliance
In the download area of the Citrix website, choose Citrix Receiver, and Receiver for Other Platforms, and click Find. Click the Receiver for Java hyperlink and download the archive.
Step 3
Extract the following files from the archive, and then add them to the ica-plugin.zip file:
• JICA-configN.jar
• JICAEngN.jar
Step 4
Ensure the EULA included with the Citrix Java client grants you the rights and permissions to deploy the client on your Web servers.
Step 5
Install the plug-in by using ASDM, or entering the following CLI command in privileged EXEC mode:
import webvpn plug-in protocol ica URL
URL is the hostname or IP address and path to the ica-plugin.zip file.
Note
Adding a bookmark is required to provide SSO support for Citrix sessions. We recommend that you use URL parameters in the bookmark the provide convenient viewing, for example: ica://10.56.1.114/?DesiredColor=4&DesiredHRes=1024&DesiredVRes=768
Step 6
Establish an SSL VPN clientless session and click the bookmark or enter the URL for the Citrix server.
Use the Client for Java Administrator’s Guide as needed.
View the Plug-ins Installed on the Security Appliance
Procedure
Step 1
List the Java-based client applications available to users of Clientless SSL VPN.
Example:
hostname#
show import webvpn plug
ssh rdp vnc ica
Step 2
Include hash and date of the plug-in.
Example:
hostname
show import webvpn plug detail
post GXN2BIGGOAOkBMibDQsMu2GWZ3Q= Tues, 29 Apr 2008 19:57:03 GMT rdp fHeyReIOUwDCgAL9HdTs PnjdBoo= Tues, 15 Sep 2009 23:23:56 GMT
Configure Port Forwarding
Port forwarding lets users access TCP-based applications over a Clientless SSL VPN connection. Such applications include the following:
8
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Prerequisites for Port Forwarding
• Lotus Notes
• Microsoft Outlook
• Microsoft Outlook Express
• Perforce
• Sametime
• Secure FTP (FTP over SSH)
• SSH
• Telnet
• Windows Terminal Service
• XDDTS
Other TCP-based applications may also work, but we have not tested them. Protocols that use UDP do not work.
Port forwarding is the legacy technology for supporting TCP-based applications over a Clientless SSL VPN connection. You may choose to use port forwarding because you have built earlier configurations that support this technology.
Consider the following alternatives to port forwarding:
• Smart tunnel access offers the following advantages to users:
◦Smart tunnel offers better performance than plug-ins.
◦Unlike port forwarding, smart tunnel simplifies the user experience by not requiring the user connection of the local application to the local port.
◦Unlike port forwarding, smart tunnel does not require users to have administrator privileges.
• Unlike port forwarding and smart tunnel access, a plug-in does not require the client application to be installed on the remote computer.
When configuring port forwarding on the ASA, you specify the port the application uses. When configuring smart tunnel access, you specify the name of the executable file or its path.
Prerequisites for Port Forwarding
• The remote host must be running a 32-bit version of one of the following:
◦Microsoft Windows Vista, Windows XP SP2 or SP3; or Windows 2000 SP4.
◦Apple Mac OS X 10.4 or 10.5 with Safari 2.0.4(419.3).
◦Fedora Core 4
• The remote host must also be running Oracle Java Runtime Environment (JRE) 5 or later.
• Browser-based users of Safari on Mac OS X 10.5.3 must identify a client certificate for use with the
URL of the ASA, once with the trailing slash and once without it, because of the way Safari interprets
URLs. For example,
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
9
Basic Clientless SSL VPN Configuration
Restrictions for Port Forwarding
◦https://example.com/
◦https://example.com
For details, go to the Safari, Mac OS X 10.5.3: Changes in client certificate authentication .
• Users of Microsoft Windows Vista or later who use port forwarding or smart tunnels must add the URL of the ASA to the Trusted Site zone. To access the Trusted Site zone, they must start Internet Explorer and choose the Tools > Internet Options > Security tab. Vista (or later) users can also switch off
Protected Mode to facilitate smart tunnel access; however, we recommend against this method because it increases the computer’s vulnerability to attack.
• Ensure Oracle Java Runtime Environment (JRE) 1.5.x or later is installed on the remote computers to support port forwarding (application access) and digital certificates.
Restrictions for Port Forwarding
• Port forwarding supports only TCP applications that use static TCP ports. Applications that use dynamic ports or multiple TCP ports are not supported. For example, SecureFTP, which uses port 22, works over
Clientless SSL VPN port forwarding, but standard FTP, which uses ports 20 and 21, does not.
• Port forwarding does not support protocols that use UDP.
• Port forwarding does not support Microsoft Outlook Exchange (MAPI) proxy. However, you can configure smart tunnel support for Microsoft Office Outlook in conjunction with Microsoft Outlook
Exchange Server.
• A stateful failover does not retain sessions established using Application Access (either port forwarding or smart tunnel access). Users must reconnect following a failover.
• Port forwarding does not support connections to personal digital assistants.
• Because port forwarding requires downloading the Java applet and configuring the local client, and because doing so requires administrator permissions on the local system, it is unlikely that users will be able to use applications when they connect from public remote systems.
The Java applet displays in its own window on the end user HTML interface. It shows the contents of the list of forwarded ports available to the user, as well as which ports are active, and amount of traffic in bytes sent and received.
• The port forwarding applet displays the local port and the remote port as the same when the local IP address 127.0.0.1 is being used and cannot be updated by the Clientless SSL VPN connection from the
ASA. As a result, the ASA creates new IP addresses 127.0.0.2, 127.0.0.3, and so on for local proxy IDs.
Because you can modify the hosts file and use different loopbacks, the remote port is used as the local port in the applet. To connect, you can use Telnet with the hostname, without specifying the port. The correct local IP addresses are available in the local hosts file.
Configure DNS for Port Forwarding
Port forwarding forwards the domain name of the remote server or its IP address to the ASA for resolution and connection. In other words, the port forwarding applet accepts a request from the application and forwards it to the ASA. The ASA makes the appropriate DNS queries and establishes the connection on behalf of the
10
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Make Applications Eligible for Port Forwarding
port forwarding applet. The port forwarding applet only makes DNS queries to the ASA. It updates the host file so that when a port forwarding application attempts a DNS query, the query redirects to a loopback address.
Configure the ASA to accept the DNS requests from the port forwarding applet as follows:
Procedure
Step 1
Enter the dns server-group mode and configure a DNS server group named example.com.
Example:
hostname(config)#
dns server-group example.com
Step 2
Specify the domain name. The default domain-name setting is DefaultDNS.
Example:
hostname(config-dns-server-group)#
domain-name example.com
Step 3
Resolve the domain name to an IP address.
Example:
hostname(config-dns-server-group)#
name-server 192.168.10.10
Step 4
Switch to Clientless SSL VPN configuration mode.
webvpn
Step 5
Switch to tunnel-group Clientless SSL VPN configuration mode.
tunnel-group webvpn
Step 6
Specify the domain name that the tunnel groups will use. By default, the security appliance assigns the default
Clientless SSL VPN group as the default tunnel group for clientless connections. Follow this instruction if the ASA uses that tunnel group to assign settings to the clientless connections. Otherwise, follow this step for each tunnel configured for clientless connections.
Example:
asa2(config-dns-server-group)#
exit
asa2(config)#
tunnel-group DefaultWEBVPNGroup webvpn-attributes
asa2(config-tunnel-webvpn)#
dns-group example.com
Make Applications Eligible for Port Forwarding
The Clientless SSL VPN configuration of each ASA supports port forwarding lists, each of which specifies local and remote ports used by the applications for which to provide access. Because each group policy or username supports only one port forwarding list, you must group each set of ca supported into a list.
Procedure
Step 1
Display the port forwarding list entries already present in the ASA configuration.
show run webvpn port-forward
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
11
Basic Clientless SSL VPN Configuration
Assign a Port Forwarding List
Step 2
Switch to Clientless SSL VPN configuration mode.
webvpn
Following the configuration of a port forwarding list, assign the list to group policies or usernames, as described in the next section.
Assign a Port Forwarding List
You can add or edit a named list of TCP applications to associate with users or group policies for access over
Clientless SSL VPN connections. For each group policy and username, you can configure Clientless SSL
VPN to do one of the following:
Note
These options are mutually exclusive for each group policy and username. Use only one.
• Start port forwarding access automatically upon user login.
Before You Begin
Before initiating the port-forward enable list name command, the user is required to start port forwarding manually, using Application Access > Start Applications on the Clientless SSL VPN portal page.
These commands are available to each group policy and username. The configuration of each group policy and username supports only one of these commands at a time, so when you enter one, the ASA replaces the one present in the configuration of the group policy or username in question with the new one, or in the case of the last command, simply removes the port-forward command from the group policy or username configuration.
Procedure
Step 1
Start port forwarding automatically upon user login.
port-forward auto-start <list name>
Step 2
Enable or prevent port forwarding upon user login.
port-forward enable <list name>
port-forward disable
Step 3
(Optional) Remove a port-forward command from the group policy or username configuration, which then inherits the [no] port-forward command from the default group policy. The keywords following the no
port-forward command are optional; however, they restrict the removal to the named port-forward command.
no port-forward [auto-start <list name> | enable <list name> | disable]
12
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Enable and Switch off Port Forwarding
Automate Port Forwarding
To start port forwarding automatically upon user login, enter the following commands:
Procedure
Step 1
Switch to Clientless SSL VPN configuration mode.
webvpn
Step 2
Switch to group-policy or username Clientless SSL VPN configuration mode.
group-policy webvpn or username webvpn
Step 3
Start port forwarding automatically upon user login.
port-forward auto-start list_name
list_name names the port forwarding list already present in the ASA Clientless SSL VPN configuration. You cannot assign more than one port forwarding list to a group policy or username.
Example:
The following example assigns the port forwarding list named apps1 to the group policy.
hostname(config-group-policy)#
webvpn
hostname(config-group-webvpn)#
port-forward auto-start apps1
Step 4
Display the port forwarding list entries present in the ASA configuration.
show run webvpn port-forward
Step 5
(Optional) Remove the port-forward command from the group policy or username and reverts to the default.
no port-forward
Enable and Switch off Port Forwarding
By default, port forwarding is switched off.
Procedure
Step 1
Enable port forwarding.
You do not have to start port forwarding manually if you entered port-forward auto-start list_name, where
list_name is the name of the port forwarding list already present in the ASA Clientless SSL VPN configuration.
You cannot assign more than one port forwarding list to a group policy or username.
port-forward [enable l<list name> | disable]
Example:
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
13
Basic Clientless SSL VPN Configuration
Configure File Access
The following example assigns the port forwarding list named apps1 to the group policy.
hostname(config-group-policy)#
webvpn
hostname(config-group-webvpn)#
port-forward enable apps1
Step 2
Display the port forwarding list entries.
show running-config port-forward
Step 3
(Optional) Remove the port-forward command from the group policy or username and revert to the default.
no port-forward
Step 4
(Optional) Switch off port forwarding.
port-forward disable
Configure File Access
Clientless SSL VPN serves remote users with HTTPS portal pages that interface with proxy CIFS and/or FTP clients running on the ASA. Using either CIFS or FTP, Clientless SSL VPN provides users with network access to the files on the network, to the extent that the users meet user authentication requirements and the file properties do not restrict access. The CIFS and FTP clients are transparent; the portal pages delivered by
Clientless SSL VPN provide the appearance of direct access to the file systems.
When a user requests a list of files, Clientless SSL VPN queries the server designated as the master browser for the IP address of the server containing the list. The ASA gets the list and delivers it to the remote user on a portal page.
Clientless SSL VPN lets the user invoke the following CIFS and FTP functions, depending on user authentication requirements and file properties:
• Navigate and list domains and workgroups, servers within a domain or workgroup, shares within a server, and files within a share or directory.
• Create directories.
• Download, upload, rename, move, and delete files.
The ASA uses a master browser, WINS server, or DNS server, typically on the same network as the ASA or reachable from that network, to query the network for a list of servers when the remote user clicks Browse
Networks in the menu of the portal page or on the toolbar displayed during the Clientless SSL VPN session.
The master browser or DNS server provides the CIFS/FTP client on the ASA with a list of the resources on the network, which Clientless SSL VPN serves to the remote user.
Note
Before configuring file access, you must configure the shares on the servers for user access.
CIFS File Access Requirement and Limitation
To access
\\server\share\subfolder\personal folder, the user must have a minimum of read permission for all parent folders, including the share itself.
14
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
CIFS File Access Requirement and Limitation
Use Download or Upload to copy and paste files to and from CIFS directories and the local desktop. The
Copy and Paste buttons are intended for remote to remote actions only, not local to remote, or remote to local.
The CIFS browse server feature does not support double-byte character share names (share names exceeding
13 characters in length). This only affects the list of folders displayed, and does not affect user access to the folder. As a workaround, you can pre-configure the bookmark(s) for the CIFS folder(s) that use double-byte share names, or the user can enter the URL or bookmark of the folder in the format cifs://server/<long-folder-name>. For example: cifs://server/Do you remember?
cifs://server/Do%20you%20remember%3F
Add Support for File Access
Note
The procedure describes how to specify the master browser and WINS servers. As an alternative, you can use ASDM to configure URL lists and entries that provide access to file shares.
Adding a share in ASDM does not require a master browser or a WINS server. However, it does not provide support for the Browse Networks link. You can use a hostname or an IP address to refer to ServerA when entering the nbns-server command. If you use a hostname, the ASA requires a DNS server to resolve it to an IP address.
Procedure
Step 1
Switch to Clientless SSL VPN configuration mode.
webvpn
Step 2
Switch to tunnel-group Clientless SSL VPN configuration mode.
tunnel-group webvpn
Step 3
Browse a network or domain for each NetBIOS Name Server (NBNS).
nbns-server {IPaddress | hostname} [master] [timeout timeout] [retry retries]
• master is the computer designated as the master browser. The master browser maintains the list of computers and shared resources. Any NBNS server you identify with this command without entering the master portion of the command must be a Windows Internet Naming Server (WINS). Specify the master browser first, then specify the WINS servers. You can specify up to three servers, including the master browser, for a connection profile.
• timeout is the number of seconds the ASA waits before sending the query again, to the same server if it is the only one, or another server if there are more than one. The default timeout is 2 seconds; the range is 1 to 30 seconds.
• retries is the number of times to retry queries to the NBNS server. The ASA recycles through the list of servers this number of times before sending an error message. The default value is 2; the range is 1 through 10.
Example:
hostname(config-tunnel-webvpn)#
nbns-server 192.168.1.20 master
hostname(config-tunnel-webvpn)#
nbns-server 192.168.1.41
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
15
Basic Clientless SSL VPN Configuration
Ensure Clock Accuracy for SharePoint Access
hostname(config-tunnel-webvpn)#
nbns-server 192.168.1.47
Step 4
Display the NBNS servers already present in the connection profile configuration.
show tunnel-group webvpn-attributes
Step 5
(Optional) Specify the character set to encode in Clientless SSL VPN portal pages delivered to remote users.
By default, the encoding type set on the remote browser determines the character set for Clientless SSL VPN portal pages, so you need to set the character encoding only if it is necessary to ensure proper encoding on the browser.
character-encoding charset
charset is a string consisting of up to 40 characters, and is equal to one of the valid character sets identified in http://www.iana.org/assignments/character-sets . You can use either the name or the alias of a character set listed on that page. Examples include iso-8859-1, shift_jis, and ibm850.
Note
The character-encoding and file-encoding values do not exclude the font family to be used by the browser. You need to complement the setting of one these values with the page style command in webvpn customization command mode to replace the font family if you are using Japanese Shift_JIS character encoding, as shown in the following example, or enter the no page style command in webvpn customization command mode to remove the font family.
Example:
The following example sets the character-encoding attribute to support Japanese Shift_JIS characters, removes the font family, and retains the default background color.
hostname(config)#
webvpn
hostname(config-webvpn)#
character-encoding shift_jis
hostname(config-webvpn)#
customization DfltCustomization
hostname(config-webvpn-custom)#
page style background-color:white
Step 6
(Optional) Specify the encoding for Clientless SSL VPN portal pages from specific CIFS servers. Thus, you can use different file-encoding values for CIFS servers that require different character encodings.
file-encoding {server-name | server-ip-address} charset
Example:
The following example sets the file-encoding attribute of the CIFS server 10.86.5.174 to support IBM860
(alias “CP860”) characters.
hostname(config-webvpn)#
file-encoding 10.86.5.174 cp860
Ensure Clock Accuracy for SharePoint Access
The Clientless SSL VPN server on the ASA uses cookies to interact with applications such as Microsoft Word on the endpoint. The cookie expiration time set by the ASA can cause Word to malfunction when accessing documents on a SharePoint server if the time on the ASA is incorrect. To prevent this malfunction, set the
ASA clock properly. We recommend configuring the ASA to dynamically synchronize the time with an NTP server. For instructions, see the section on setting the date and time in the general operations configuration guide.
16
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Virtual Desktop Infrastructure (VDI)
Virtual Desktop Infrastructure (VDI)
The ASA supports connections to Citrix and VMWare VDI servers.
• For Citrix, the ASA allows access through clientless portal to user's running Citrix Receiver.
• VMWare is configured as a (smart tunnel) application.
VDI servers can also be accessed through bookmarks on the Clientless Portal, like other server applications.
Limitations to VDI
• Authentication using certificates or Smart Cards is not supported for auto sign-on, since these forms of authentication do not allow the ASA in the middle.
• The XML service must be installed and configured on the XenApp and XenDesktop servers.
• Client certificate verifications, double Auth, internal passwords and CSD (all of CSD, not just Vault) are not supported when standalone mobile clients are used.
Citrix Mobile Support
A mobile user running the Citrix Receiver can connect to the Citrix server by:
• Connecting to the ASA with AnyConnect, and then connecting to the Citrix server.
• Connecting to the Citrix server through the ASA, without using the AnyConnect client. Logon credentials can include:
◦A connection profile alias (also referred to as a tunnel-group alias) in the Citrix logon screen. A
VDI server can have several group policies, each with different authorization and connection settings.
◦An RSA SecureID token value, when the RSA server is configured. RSA support includes next token for an invalid entry, and also for entering a new PIN for an initial or expired PIN.
Supported Mobile Devices for Citrix
• iPad—Citrix Receiver version 4.x or later
• iPhone/iTouch—Citrix Receiver version 4.x or later
• Android 2.x/3.x/4.0/4.1 phone—Citrix Receiver version 2.x or later
• Android 4.0 phone—Citrix Receiver version 2.x or later
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
17
Basic Clientless SSL VPN Configuration
Configure the ASA to Proxy a Citrix Server
Limitations of Citrix
Certificate Limitations
• Certificate/Smart Card authentication is not supported as means of auto sign-on.
• Client certificate verifications and CSD are not supported
• Md5 signature in the certificates are not working because of security issue, which is a known problem on iOS: http://support.citrix.com/article/CTX132798
• SHA2 signature is not supported except for Windows, as described on the Citrix website: http://www.citrix.com/
• A key size >1024 is not supported
Other Limitations
• HTTP redirect is not supported; the Citrix Receiver application does not work with redirects.
• XML service must be installed and configured on the XenApp and XenDesktop servers.
About Citrix Mobile Receiver User Logon
The logon for mobile users connecting to the Citrix server depends on whether the ASA has configured the
Citrix server as a VDI server or a VDI proxy server.
When the Citrix server is configured as a VDI server:
1
Using the AnyConnect Secure Mobility Client, connect to ASA with VPN credentials.
2
Using Citrix Mobile Receiver, connect to Citrix server with Citrix server credentials (if single-signon is configured, the Citrix credentials are not required).
When the ASA is configured as a to a VDI proxy server:
1
Using Citrix Mobile Receiver, connect to the ASA entering credentials for both the VPN and Citrix server.
After the first connection, if properly configured, subsequent connections only require VPN credentials.
Configure the ASA to Proxy a Citrix Server
You can configure the ASA to act as a proxy for the Citrix servers, so that connections to the ASA appear to the user like connections to the Citrix servers. The AnyConnect client is not required when you enable VDI proxy in ASDM. The following high-level steps show how the end user connects to Citrix.
Procedure
Step 1
A mobile user opens Citrix Receiver and connects to ASA's URL.
Step 2
The user provides credentials for the XenApp server and the VPN credentials on the Citrix logon screen.
Step 3
For each subsequent connection to the Citrix server, the user only needs to enter the VPN credentials.
18
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Configure the ASA to Proxy a Citrix Server
Using the ASA as a proxy for XenApp and XenDesktop removes the requirement for a Citrix Access Gateway.
XenApp server info is logged on the ASA, and displays in ASDM.
Configure the Citrix server's address and logon credentials, and assign that VDI server to a Group Policy or username. If both username and group-policy are configured, username settings override group-policy settings.
What to Do Next
http://www.youtube.com/watch?v=JMM2RzppaG8 - This video describes the advantages of using the ASA as a Citrix proxy.
Assign a VDI Server to a Group Policy
VDI servers are configured and assigned to Group Policies by:
• Adding the VDI server on the VDI Access pane, and assigning a group policy to the server.
• Adding a VDI server to the group policy.
If both username and group policy are configured, username settings take precedence over group policy. Enter the following: configure terminal group-policy DfltGrpPolicy attributes webvpn vdi type <citrix> url <url> domain <domain> username <username> password
<password> configure terminal username <username> attributes webvpn vdi type <citrix> url <url> domain <domain> username <username> password
<password>]
The syntax options are defined as follows:
• type—Type of VDI. For a Citrix Receiver type, this value must be citrix.
• url—Full URL of the XenApp or XenDesktop server including http or https, hostname, and port number, as well as the path to the XML service.
• username—Username for logging into the virtualization infrastructure server. This value can be a clientless macro.
• password—Password for logging into the virtualization infrastructure server. This value can be a clientless macro.
• domain—Domain for logging into the virtualization infrastructure server. This value can be a clientless macro.
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
19
Basic Clientless SSL VPN Configuration
Use SSL to Access Internal Servers
Use SSL to Access Internal Servers
Procedure
Step 1
Switch to group policy Clientless SSL VPN configuration mode.
webvpn
Step 2
Switch off URL entry.
url-entry disable
Clientless SSL VPN uses SSL and its successor, TLS1 to provide a secure connection between remote users and specific, supported internal resources at an internal server.
Use HTTPS for Clientless SSL VPN Sessions
Before You Begin
In a Web browser, users enter the ASA address in the format https://address where address is the IP address or DNS hostname of the ASA interface.
• You must enable Clientless SSL VPN sessions on the ASA interface that users connect to.
• You must use HTTPS to access the ASA or load-balancing cluster.
Procedure
Step 1
Switch to Clientless SSL VPN configuration mode.
webvpn
Step 2
Enable Clientless SSL VPN sessions on the interface called outside.
enable <name of interface to use for Clientless SSL VPN sessions>
Example
hostname(config)#
webvpn
hostname(config-webvpn)#
enable outside
Configure Clientless SSL VPN and ASDM Ports
From version 8.0(2), the ASA supports both Clientless SSL VPN sessions and ASDM administrative sessions simultaneously on port 443 of the outside interface. You can configure these applications on different interfaces.
20
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Configure Support for Proxy Servers
Procedure
Step 1
Switch to Clientless SSL VPN configuration mode.
webvpn
Step 2
Change the SSL listening port for Clientless SSL VPN.
port port_number
Example:
This example enables Clientless SSL VPN on port 444 of the outside interface. With this configuration, remote users initiating Clientless SSL VPN sessions enter https://<outside_ip>:444 in the browser.
hostname(config)#
http server enable
hostname(config)#
http 192.168.3.0 255.255.255.0 outside
hostname(config)#
webvpn
hostname(config-webvpn)#
port 444
hostname(config-webvpn)#
enable outside
Step 3
(Privileged mode) Change the listening port for ASDM.
http server enable
Example:
This example specifies that HTTPS ASDM sessions use port 444 on the outside interface. Clientless SSL
VPN is also enabled on the outside interface and uses the default port (443). With this configuration, remote users initiate ASDM sessions by entering https://<outside_ip>:444.
hostname(config)#
http server enable
hostname(config)#
http 192.168.3.0 255.255.255.0 outside
hostname(config)#
webvpn
hostname(config-webvpn)#
enable outside
Configure Support for Proxy Servers
The ASA can terminate HTTPS connections and forward HTTP and HTTPS requests to proxy servers. These servers act as intermediaries between users and the public or private network. Requiring network access via a proxy server that the organization controls provides another opportunity for filtering, to assure secure network access and administrative control.
When configuring support for HTTP and HTTPS proxy services, you can assign preset credentials to send with each request for basic authentication. You can also specify URLs to exclude from HTTP and HTTPS requests.
Before You Begin
You can specify a proxy autoconfiguration (PAC) file to download from an HTTP proxy server, however, you may not use proxy authentication when specifying the PAC file.
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
21
Basic Clientless SSL VPN Configuration
Configure Support for Proxy Servers
Procedure
Step 1
Switch to Clientless SSL VPN configuration mode.
webvpn
Step 2
Configure the ASA to use an external proxy server to handle HTTP and HTTPS requests.
http-proxy and https-proxy
Note
Proxy NTLM authentication is not supported in http-proxy. Only proxy without authentication and basic authentication are supported.
Step 3
Configure HTTP proxy.
http-proxy host [port] [exclude url] [username username {password password}]
Step 4
Configure HTTPS proxy.
https-proxy host [port] [exclude url] [username username {password password}]
Step 5
Set the PAC file URL.
http-proxy pac url
Step 6
(Optional) Exclude URLs from those that can be sent to the proxy server.
exclude
Step 7
Provide the hostname or IP address for the external proxy server.
host
Step 8
Download the proxy autoconfiguration file to the ASA using a JavaScript function which identifies a proxy for each URL.
pac
Step 9
(Optional) (Only available if you specify a username) Accompanies each proxy request with a password to provide basic, proxy authentication.
password
Step 10 Send the password to the proxy server with each HTTP or HTTPS request.
password
Step 11 (Optional) Provide the port number used by the proxy server. The default HTTP port is 80. The default HTTPS port is 443. The ASA uses each of these ports if you do not specify an alternative value. The range is 1-65535.
port
Step 12 If you entered exclude, enter a URL or a comma-delimited list of several URLs to exclude from those that can be sent to the proxy server. The string does not have a character limit, but the entire command cannot exceed 512 characters. You can specify literal URLs or use the following wildcards:
• * to match any string, including slashes (/) and periods (.). You must accompany this wildcard with an alphanumeric string.
• ? to match any single character, including slashes and periods.
• [x-y] to match any single character in the range of x and y, where x represents one character and y represents another character in the ANSI character set.
• [!x-y] to match any single character that is not in the range.
22
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Configure SSL/TLS Encryption Protocols
Step 13 If you entered http-proxy pac, follow it with http:// and type the URL of the proxy autoconfiguration file.
(If you omit the http:// portion, the CLI ignores the command.)
Step 14 (Optional) Accompany each HTTP proxy request with a username for basic, proxy authentication. Only the
http-proxyhost command supports this keyword.
username
Step 15 Send the username to the proxy server with each HTTP or HTTPS request.
username
Step 16 Show how to configure use of an HTTP proxy server with an IP address of 209.165. 201.1 using the default port, sending a username and password with each HTTP request.
Example:
hostname(config-webvpn)#
http-proxy 209.165.201.1 user jsmith password mysecretdonttell
Step 17 Show the same command, except when the ASA receives the specific URL www.example.com in an HTTP request, it resolves the request instead of passing it on to the proxy server.
Example:
hostname(config-webvpn)#
password mysecretdonttell http-proxy 209.165.201.1 exclude www.example.com username jsmith
Step 18 Show how to specify a URL to serve a proxy autoconfiguration file to the browser.
Example:
hostname(config-webvpn)#
http-proxy pac http:// www.example.com/pac
The ASA Clientless SSL VPN configuration supports only one http-proxy and one https-proxy command each. For example, if one instance of the http-proxy command is already present in the running configuration and you enter another, the CLI overwrites the previous instance.
Note
Proxy NTLM authentication is not supported in http-proxy. Only proxy without authentication and basic authentication is supported.
Configure SSL/TLS Encryption Protocols
Port forwarding requires the Oracle Java Runtime Environment (JRE). Port forwarding does not work when a user of Clientless SSL VPN connects with some SSL versions. Refer to the Supported VPN Platforms, Cisco
ASA 5500 Series for supported JRE versions.
Authenticate with Digital Certificates
SSL uses digital certificates for authentication. The ASA creates a self-signed SSL server certificate when it boots; or you can install in the ASA an SSL certificate that has been issued in a PKI context. For HTTPS, this certificate must then be installed on the client.
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
23
Basic Clientless SSL VPN Configuration
Configure Browser Access to Client-Server Plug-ins
Restrictions of Digital Certificates Authentication
Email clients such as MS Outlook, MS Outlook Express, and Eudora lack the ability to access the certificate store.
For more information on authentication and authorization using digital certificates, see the section on using certificates and user login credentials in the general operations configuration guide.
Configure Browser Access to Client-Server Plug-ins
The Client-Server Plug-in table displays the plug-ins the ASA makes available to browsers in Clientless SSL
VPN sessions.
To add, change, or remove a plug-in, do one of the following:
• To add a plug-in, click Import. The Import Plug-ins dialog box opens.
• To remove a plug-in, choose it and click Delete.
About Installing Browser Plug-ins
A browser plug-in is a separate program that a Web browser invokes to perform a dedicated function, such as connect a client to a server within the browser window. The ASA lets you import plug-ins for download to remote browsers in Clientless SSL VPN sessions. Of course, Cisco tests the plug-ins it redistributes, and in some cases, tests the connectivity of plug-ins we cannot redistribute. However, we do not recommend importing plug-ins that support streaming media at this time.
The ASA does the following when you install a plug-in onto the flash device:
• (Cisco-distributed plug-ins only) Unpacks the jar file specified in the URL.
• Writes the file to the csco-config/97/plugin directory on the ASA file system.
• Populates the drop-down list next to the URL attributes in ASDM.
• Enables the plug-in for all future Clientless SSL VPN sessions, and adds a main menu option and an option to the drop-down list next to the Address field of the portal page.
The following table shows the changes to the main menu and address field of the portal page when you add the plug-ins described in the following sections.
Table 3: Effects of Plug-ins on the Clientless SSL VPN Portal Page
Plug-in
ica rdp rdp2
Main Menu Option Added to Portal Page
Citrix Client
Terminal Servers
Terminal Servers Vista
Address Field Option Added to Portal Page
citrix:// rdp:// rdp2://
24
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
About Installing Browser Plug-ins
Plug-in
ssh,telnet
Main Menu Option Added to Portal Page
SSH
Telnet vnc VNC Client
Address Field Option Added to Portal Page
ssh:// telnet:// vnc://
Note
A secondary ASA obtains the plug-ins from the primary ASA.
When the user in a Clientless SSL VPN session clicks the associated menu option on the portal page, the portal page displays a window to the interface and displays a help pane. The user can choose the protocol displayed in the drop-down list and enter the URL in the Address field to establish a connection.
Note
Some Java plug-ins may report a status of connected or online even when a session to the destination service is not set up. The open-source plug-in reports the status, not the ASA.
Prerequisites for Installing Browser Plug-ins
• The plug-ins do not work if the security appliance configures the clientless session to use a proxy server.
Note
The remote desktop protocol plug-in does not support load balancing with a session broker. Because of the way the protocol handles the redirect from the session broker, the connection fails. If a session broker is not used, the plug-in works.
• The plug-ins support single sign-on (SSO). They use the same credentials entered to open the Clientless
SSL VPN session. Because the plug-ins do not support macro substitution, you do not have the options to perform SSO on different fields such as the internal domain password or on an attribute on a RADIUS or LDAP server.
• To configure SSO support for a plug-in, you install the plug-in, add a bookmark entry to display a link to the server, and specify SSO support when adding the bookmark.
• The minimum access rights required for remote use belong to the guest privilege mode.
Requirements for Installing Browser Plug-ins
• Per the GNU General Public License (GPL), Cisco redistributes plug-ins without having made any changes to them. Per the GPL, Cisco cannot directly enhance these plug-ins.
• Clientless SSL VPN must be enabled on the ASA to provide remote access to the plug-ins.
• A stateful failover does not retain sessions established using plug-ins. Users must reconnect following a failover.
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
25
Basic Clientless SSL VPN Configuration
Prepare the Security Appliance for a Plug-in
• Plug-ins require that ActiveX or Oracle Java Runtime Environment (JRE) is enabled on the browser.
There is no ActiveX version of the RDP plug-in for 64-bit browsers.
Set Up RDP Plug-in
To set up and use an RDP plug-in, you must add a new environment variable.
Procedure
Step 1
Right-click My Computer to access the System Properties, and choose the Advanced tab.
Step 2
On the Advanced tab, choose the environment variables button.
Step 3
In the new user variable dialog box, enter the RF_DEBUG variable.
Step 4
Verify the new Environment Variable in the user variables section.
Step 5
If you used the client computer with versions of Clientless SSL VPN before version 8.3, you must remove the old Cisco Portforwarder Control. Go to the C:/WINDOWS/Downloaded Program Files directory, right-click portforwarder control, and choose Remove.
Step 6
Clear all of the Internet Explorer browser cache.
Step 7
Launch your Clientless SSL VPN session and establish an RDP session with the RDP ActiveX Plug-in.
You can now observe events in the Windows Application Event viewer.
Prepare the Security Appliance for a Plug-in
Procedure
Step 1
Ensure that Clientless SSL VPN is enabled on an ASA interface.
Step 2
Install an SSL certificate onto the ASA interface to which remote users use a fully-qualified domain name
(FQDN) to connect.
Note
Do not specify an IP address as the common name (CN) for the SSL certificate. The remote user attempts to use the FQDN to communicate with the ASA. The remote PC must be able to use DNS or an entry in the System32\drivers\etc\hosts file to resolve the FQDN.
Configure the ASA to Use the New HTML File
Procedure
Step 1
Import the file and images as Web Content.
import webvpn webcontent <file> <url>
26
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Basic Clientless SSL VPN Configuration
Prepare the Security Appliance for a Plug-in
Example:
hostname#
import webvpn webcontent /+CSCOU+/login.inc tftp://209.165.200.225/login.inc
!!!!* Web resource `+CSCOU+/login.inc' was successfully initialized hostname#
Step 2
Export a customization template.
export webvpn customization <file> <URL>
Example:
hostname#
export webvpn customization template tftp://209.165.200.225/sales_vpn_login
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
%INFO: Customization object 'Template' was exported to tftp://10.21.50.120/sales
_vpn_login
Step 3
Change the full customization mode tag in the file to enable.
Example:
This example supplies the URL of the login file stored in the ASA memory.
<full-customization>
<mode>enable</mode>
<url>/
+CSCOU+/login.inc</url>
</full-customization>
Step 4
Import the file as a new customization object.
Example:
hostname# import webvpn customization sales_vpn_login tftp://10.21.50.120/sales_vpn_login$
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
%INFO: customization object 'sales_vpn_login' was successfully imported
Step 5
Apply the customization object to a Connection Profile (tunnel group).
Example:
hostname(config)#
tunnel-group Sales webvpn-attributes
hostname(config-tunnel-webvpn)#
customization sales_vpn_login
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
27
Prepare the Security Appliance for a Plug-in
Basic Clientless SSL VPN Configuration
28
CLI Book 3: Cisco ASA Series VPN CLI Configuration Guide, 9.4
Download
Public link updated
The public link to your chat has been updated. You may view and manage your chat links after registration here.
Document public link
Advertisement
Key features
Clientless access
Secure connection
Centralized management
Flexible deployment options
Supports a wide range of applications
Frequently asked questions
Clientless SSL VPN is a type of VPN that allows users to connect to a network without installing any software on their devices. The ASA Series SSL VPN supports Clientless SSL VPN connections.
Clientless SSL VPN connections are established through a web browser. The user simply goes to a web page that is hosted on the ASA Series SSL VPN. The user then enters their credentials and is then connected to the network. The ASA Series SSL VPN rewrites each URL to one that is meaningful only to the ASA. The user cannot use this URL to confirm that they are connected to the website they requested.
Clientless SSL VPN connections are secure, easy to use, and offer a variety of features to help you improve security and performance.