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Cisco PIX 501, want to restrict specific VPDN user to one IP on internal network

Posted on 2006-05-09
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Last Modified: 2013-11-16
Does anyone have a link to some documentation on the best way to configure restrictions/ACLs for a particular VPDN user?

We have a PIX 501 that we use for remote support staff and we want to setup a particular VPDN user so that he/she only has access to one IP on the internal network not the entire subnet.  We currently have the VPDN setup working no problem but we are not sure how to neck down access to this single user?

Current config:

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password blahblah encrypted
passwd blahblah encrypted
hostname pix02
domain-name blah.com
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
access-list inside_outbound_nat0_acl permit ip any 192.168.16.192 255.255.255.192
access-list inside_outbound_nat0_acl permit ip any 192.168.14.0 255.255.255.0
access-list out-in permit tcp any host x.x.x.x eq smtp log
access-list out-in permit tcp any host x.x.x.x eq https log
access-list out-in permit icmp any any
pager lines 24
logging on
logging timestamp
logging trap informational
logging queue 2048
logging host inside blah
mtu outside 1500
mtu inside 1500
ip address outside x.x.x.x 255.255.255.xxx
ip address inside 192.168.15.250 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool vpm 192.168.14.1-192.168.14.200
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) tcp x.x.x.x smtp x.x.x.x smtp netmask 255.255.255.255 0 0
static (inside,outside) tcp x.x.x.x https x.x.x.x https netmask 255.255.255.255 0 0
access-group out-in in interface outside
route outside 0.0.0.0 0.0.0.0 x.x.x.x 1
route inside x.x.x.x 255.255.255.0 192.168.15.254 1
route inside x.x.x.x 255.255.255.0 192.168.15.254 1
route inside x.x.x.x 255.255.255.0 192.168.15.254 1
route inside x.x.x.x 255.255.255.0 192.168.15.254 1
route inside 192.168.17.0 255.255.255.0 192.168.15.2 1
route inside 192.168.18.0 255.255.255.0 192.168.15.2 1
route inside 192.168.19.0 255.255.255.0 192.168.15.2 1
route inside 192.168.255.0 255.255.255.0 192.168.15.254 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout sip-disconnect 0:02:00 sip-invite 0:03:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
snmp-server host inside x.x.x.x
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-pptp
ssh timeout 5
console timeout 0
vpdn group PPTP-VPDN-GROUP accept dialin pptp
vpdn group PPTP-VPDN-GROUP ppp authentication pap
vpdn group PPTP-VPDN-GROUP ppp authentication chap
vpdn group PPTP-VPDN-GROUP ppp authentication mschap
vpdn group PPTP-VPDN-GROUP ppp encryption mppe auto required
vpdn group PPTP-VPDN-GROUP client configuration address local vpm
vpdn group PPTP-VPDN-GROUP client configuration dns 192.168.15.12 192.168.15.3
vpdn group PPTP-VPDN-GROUP client configuration wins 192.168.15.12 192.168.15.3
vpdn group PPTP-VPDN-GROUP pptp echo 60
vpdn group PPTP-VPDN-GROUP client authentication local
vpdn username xxxxxxx password **********
vpdn username xxxxxxx password **********
vpdn username xxxxxxx password **********
vpdn username xxxxxxxx password **********
vpdn enable outside
terminal width 80
Cryptochecksum:xxxxx
: end
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Question by:citrc
  • 2
3 Comments
 
LVL 9

Expert Comment

by:stressedout2004
ID: 16640847
If you want to restrict the access for a *specific* user using ACL, then you will need to know what IP address
that user is assigned to when it connects via PPTP. Now this would be difficult because the user will not
get the same IP address all the time.  Creating a new VPDN group with a different pool is not an option since PPTP
has no concept of group name unlike the IPSEC clients. I am not saying you can't implement ACLs to restric
access to your local LAN, its just that you can't do it for a per user basis.

Anyway, to implement ACL, what you can do is remove the sysopt connection permit-pptp and add an ACL entry for
acl out-in defining the rule you want to implement.

e.g.

no sysopt connection permit-pptp
access-list out-in permit ip 192.168.14.0 255.255.255.0 host 192.168.15.x
clear xlate

This will lockdown the access of *all* PPTP users to only one host in the entire network. I know this is not
what you wanted but I don't see any other way of doing this unless you switch to IPSEC.




0
 

Author Comment

by:citrc
ID: 16640905
Hmmm....  so if I switch to IPSEC that will require the remote user to use the Cisco VPN client is that correct?

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LVL 9

Accepted Solution

by:
stressedout2004 earned 540 total points
ID: 16641449
Yes, that's correct.
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