Auth-proxy Authentication Inbound (Cisco IOS Firewall, no NAT) Configuration

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Updated:August 15, 2006

Document ID:13888

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Introduction

Prerequisites

Requirements

Components Used

Conventions

Configure

Network Diagram

Configuration

Verify

Troubleshoot

Related Information

Introduction

This sample configuration initially blocks traffic from external hosts to all devices on the internal network until browser authentication is performed with the use of authentication proxy. The access list passed down from the server (permit tcp|ip|icmp any any) adds dynamic entries post-authorization to access-list 115 that temporarily allow access from the external PC to the internal network.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document is based on these software and hardware versions:

Cisco IOS® Software Release 12.0.7.T
Cisco 3640 router

Note: The ip auth-proxy command is introduced in Cisco IOS Software Release 12.0.5.T. This configuration was tested with Cisco IOS Software Release 12.0.7.T.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

3640 Router
Current configuration: ! version 12.0 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname security-3640 ! aaa new-model aaa group server tacacs+ RTP server 171.68.118.115 ! aaa authentication login default group RTP none aaa authorization exec default group RTP none aaa authorization auth-proxy default group RTP enable secret 5 $1$H9zZ$z9bu5HMy4NTtjsvIhltGT0 enable password ww ! ip subnet-zero ! ip inspect name myfw cuseeme timeout 3600 ip inspect name myfw ftp timeout 3600 ip inspect name myfw http timeout 3600 ip inspect name myfw rcmd timeout 3600 ip inspect name myfw realaudio timeout 3600 ip inspect name myfw smtp timeout 3600 ip inspect name myfw sqlnet timeout 3600 ip inspect name myfw streamworks timeout 3600 ip inspect name myfw tftp timeout 30 ip inspect name myfw udp timeout 15 ip inspect name myfw tcp timeout 3600 ip auth-proxy auth-proxy-banner ip auth-proxy auth-cache-time 10 ip auth-proxy name list_a http ip audit notify log ip audit po max-events 100 cns event-service server ! process-max-time 200 ! interface FastEthernet0/0 ip address 40.31.1.150 255.255.255.0 ip access-group 101 in no ip directed-broadcast ip inspect myfw in no mop enabled ! interface FastEthernet1/0 ip address 11.11.11.11 255.255.255.0 ip access-group 115 in no ip directed-broadcast ip auth-proxy list_a ! ip classless ip route 0.0.0.0 0.0.0.0 11.11.11.1 ip route 171.68.118.0 255.255.255.0 40.31.1.1 ip http server ip http authentication aaa ! access-list 101 permit icmp 40.31.1.0 0.0.0.255 any access-list 101 permit tcp 40.31.1.0 0.0.0.255 any access-list 101 permit udp 40.31.1.0 0.0.0.255 any access-list 101 permit icmp 171.68.118.0 0.0.0.255 any access-list 101 permit tcp 171.68.118.0 0.0.0.255 any access-list 101 permit udp 171.68.118.0 0.0.0.255 any access-list 115 permit tcp host 11.11.11.12 host 11.11.11.11 eq www access-list 115 deny tcp any any access-list 115 deny udp any any access-list 115 permit icmp any 40.31.1.0 0.0.0.255 echo access-list 115 permit icmp any 40.31.1.0 0.0.0.255 echo-reply access-list 115 permit icmp any 40.31.1.0 0.0.0.255 packet-too-big access-list 115 permit icmp any 40.31.1.0 0.0.0.255 time-exceeded access-list 115 permit icmp any 40.31.1.0 0.0.0.255 traceroute access-list 115 permit icmp any 40.31.1.0 0.0.0.255 unreachable access-list 115 permit icmp any 40.31.1.0 0.0.0.255 administratively-prohibited dialer-list 1 protocol ip permit dialer-list 1 protocol ipx permit ! tacacs-server host 171.68.118.115 tacacs-server key cisco radius-server host 171.68.118.115 radius-server key cisco ! line con 0 transport input none line aux 0 line vty 0 4 password ww ! ! end

Current configuration:
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname security-3640
!
aaa new-model
aaa group server tacacs+ RTP
 server 171.68.118.115
!
aaa authentication login default group RTP none
aaa authorization exec default group RTP none
aaa authorization auth-proxy default group RTP
enable secret 5 $1$H9zZ$z9bu5HMy4NTtjsvIhltGT0
enable password ww
!
ip subnet-zero
!
ip inspect name myfw cuseeme timeout 3600
ip inspect name myfw ftp timeout 3600
ip inspect name myfw http timeout 3600
ip inspect name myfw rcmd timeout 3600
ip inspect name myfw realaudio timeout 3600
ip inspect name myfw smtp timeout 3600
ip inspect name myfw sqlnet timeout 3600
ip inspect name myfw streamworks timeout 3600
ip inspect name myfw tftp timeout 30
ip inspect name myfw udp timeout 15
ip inspect name myfw tcp timeout 3600
ip auth-proxy auth-proxy-banner
ip auth-proxy auth-cache-time 10
ip auth-proxy name list_a http
ip audit notify log
ip audit po max-events 100
cns event-service server
!
process-max-time 200
!
interface FastEthernet0/0
 ip address 40.31.1.150 255.255.255.0
 ip access-group 101 in
 no ip directed-broadcast
 ip inspect myfw in
 no mop enabled
!
interface FastEthernet1/0
 ip address 11.11.11.11 255.255.255.0
 ip access-group 115 in
 no ip directed-broadcast
 ip auth-proxy list_a
!
ip classless
ip route 0.0.0.0 0.0.0.0 11.11.11.1
ip route 171.68.118.0 255.255.255.0 40.31.1.1
ip http server
ip http authentication aaa
!
access-list 101 permit icmp 40.31.1.0 0.0.0.255 any
access-list 101 permit tcp 40.31.1.0 0.0.0.255 any
access-list 101 permit udp 40.31.1.0 0.0.0.255 any
access-list 101 permit icmp 171.68.118.0 0.0.0.255 any
access-list 101 permit tcp 171.68.118.0 0.0.0.255 any
access-list 101 permit udp 171.68.118.0 0.0.0.255 any
access-list 115 permit tcp host 11.11.11.12 host 11.11.11.11 eq www
access-list 115 deny   tcp any any
access-list 115 deny   udp any any
access-list 115 permit icmp any 40.31.1.0 0.0.0.255 echo
access-list 115 permit icmp any 40.31.1.0 0.0.0.255 echo-reply
access-list 115 permit icmp any 40.31.1.0 0.0.0.255 packet-too-big
access-list 115 permit icmp any 40.31.1.0 0.0.0.255 time-exceeded
access-list 115 permit icmp any 40.31.1.0 0.0.0.255 traceroute
access-list 115 permit icmp any 40.31.1.0 0.0.0.255 unreachable
access-list 115 permit icmp any 40.31.1.0 0.0.0.255 administratively-prohibited
dialer-list 1 protocol ip permit
dialer-list 1 protocol ipx permit
!
tacacs-server host 171.68.118.115
tacacs-server key cisco
radius-server host 171.68.118.115
radius-server key cisco

!
line con 0
 transport input none
line aux 0
line vty 0 4
 password ww
!
!
end