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Controlling Access for Nonsupported Applications
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As I mentioned in the previous section, one limitation of CTP is that it can only be used to authenticate HTTP, HTTPS, FTP, and telnet connections If you have other applications that you need to authenticate, the CTP feature will be unable to handle the authentication However, you do have three other options available: Use authentication on the application server the user is trying to access Use the Virtual Telnet feature on the appliance this is used when the destination server doesn t support HTTP, HTTPS, FTP, or telnet Use the Virtual HTTP feature on the appliance this is used when the appliance and destination web server don t use the same AAA server for authentication; in this situation, the user must perform two separate authentications one to the appliance and one to the web server
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One problem with having the application server perform the authentication is that your authentication mechanism isn t centralized you need to set up authentication on every server where you need user authentication Virtual Telnet and Virtual HTTP provide a more scalable solution, as you will see in the following sections, and can authenticate and authorize connections in both the inbound and outbound directions Using Virtual Telnet Typically, you ll use Virtual Telnet when you need to authenticate connections other than HTTP, FTP, or telnet With Virtual Telnet, the user telnets to a virtual telnet address on the appliance and then supplies a username and password for authentication Once authenticated, the appliance terminates the telnet session and allows the user to open her data connection In other words, the Virtual Telnet address on the appliance cannot be used to access an EXEC shell on it One annoyance with Virtual Telnet is that it is a two-step process for a user to connect to a resource the user telnets into the appliance to authenticate, and then the user opens the application connection to the actual service Let s look at a simple example where you can use Virtual Telnet You have an internal TFTP server (UDP 69) Obviously, CTP can t authenticate this connection You can
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authenticate this connection using Virtual Telnet, however To accomplish this, the user first telnets to a virtual IP address on the appliance this address must be a reachable address (on the Internet, this has to be a public address) Actually the virtual IP address is similar to a loopback address on an IOS-based router The Virtual Telnet connection must be permitted in the ACL of the interface the user s traffic is entering For inbound users, whether or not NAT control is enabled, you must include the Virtual Telnet address in a static command (An identity NAT command is commonly used, where the Virtual Telnet address is translated to itself) The static command is not required for outbound Virtual Telnet The appliance then prompts the user for a username and password, and then authenticates this information via an AAA server If the authentication is successful, the user can now successfully access other services listed in the aaa authentication include or listed as permit statements in the ACL referenced in the aaa authentication match commands If a user wants to gracefully log out of his CTP authenticated session set up with Virtual Telnet, he only needs to re-telnet to the virtual address and re-authenticate This second authentication process will unauthenticate the user To set up Virtual Telnet on your appliance, add the following command to your CTP authentication setup:
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ciscoasa(config)# virtual telnet global_IP_address
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The IP address must be a public-reachable address treat this address as a loopback address on the appliance: it is an unused address associated with the appliance For inbound users, this will typically be a public IP address; for outbound users, it can be either a public or a private IP address After configuring this command, you must still configure your other AAA commands discussed in previous sections To help illustrate the use of Virtual Telnet, I ll use the network in Figure 8-2 Here is the code to set up Virtual Telnet for this network:
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ciscoasa(config)# virtual telnet 2002002002 ciscoasa(config)# aaa-server TACSRV protocol tacacs+ ciscoasa(config)# aaa-server TACSRV (inside) host 19216812 thisisasecret ciscoasa(config)# access-list INBOUND permit tcp any 2002002002 eq 23 ciscoasa(config)# access-list INBOUND permit udp any 2002002003 eq 69 ciscoasa(config)# access-list INBOUND permit udp any 2002002004 eq 80 ciscoasa(config)# access-group INBOUND in interface outside ciscoasa(config)# access-list CTP_AUTH permit tcp any 2002002002 eq 23 ciscoasa(config)# access-list CTP_AUTH permit udp any 2002002003 eq 69
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Internet Virtual Address 2002002002 outside E0/0 2002002001 Appliance inside E0/1 19216811 AAA Server TFTP Server 19216812 19216813 Web Server 19216814
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