09-21-2012 09:51 PM
I'm helping some one set up a VPN in order to share files between two locations. I'm not sure it's the best solution, but he insists on using his Cisco ASA 5505 Firewall via a clientless VPN. His set-up is a simple residential cable modem (Motorola SurfBoard/TimeWarner) set in DMZ mode, the Cisco ASA, and an Ubuntu server.
The Clientless VPN is set up, as are the user groups, and bookmarks. I'm able to browse to the firewall's internal interface IP (https://192.168.1.1) and log in to the Clientless VPN portal, and from there, I can access all of the plug-ins I've configured (CIFS, VNC, etc). The problem is that I cannot connect from outside the local area network.
I think it's something very basic that I'm missing, like a NAT rule. I've tried adding some, but they always seem to interfer with the NAT rule allowing users to connect, via the internet, to the Apache web server (port 80) running on the Ubuntu machine behind the ASA Firewall.
Like I said, I'm not sure this is the best solution for him. Using an ASA seems like overkill for something that can be accomplished with some software, but he and I are both fans of Cisco, and, as I said, he is adament about using this set-up. If it comes down to it, I'd like to be able to honestly tell him that I exhausted every resource in trying to find a way to make this work for him before giving up and going to "Plan B".
Any help is greatly appreciated.
(I'm trying to stick to the ASDM, but the terminal interface is something I can use too)
09-21-2012 11:05 PM
Hello Tony,
I have not done SSL vpns, but generally when you get these kind of issues, two common causes are:
1. missing route on the inside host/server towards the VPN subnet
2. using "any" in crypto-acls and nonat-acls (sometimes you can get away with it, if not - sometimes you can juggle crypto map priorities to get around it, and then - sometimes you just have to add explicit granular acls for each and every remote network, and skip the "any" statements altogether. I find it's a good idea to do it this way from the start)
Also, your chances of getting helpful replies (or replies at all) will increase a lot if you post a (sanitised) config.
Hope this helps,
best,
Johnny
09-22-2012 09:03 AM
Johnny, et al
Thank you for the fast reply! I will look into those things you suggested as soon as possible.
I can't believe I didn't think to post a config dump in my first post! Thank you, though, for reminding me.
In the working config, I have removed anything that looked to me like a hash of any sort, usernames, URLs, and internet facing IP addresses. I hope I didn't miss anything private.
When looking at this, you'll notice that I have proxies enabled for the Clientless VPN. As far as I know, I don't need those. I had enabled them to see if it would help with a temporary fix I was trying, but failed, and forgot to disable those proxy options on the ASA.
ASA Version 8.2(5)
!
hostname ciscoasa
enable password
passwd
names
name 192.168.1.17 server-pri
name
name 192.168.1.1 asa-internal
!
interface Ethernet0/0
switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/7
!
interface Vlan1
nameif inside
security-level 100
ip address asa-internal 255.255.255.0
!
interface Vlan2
nameif outside
security-level 0
ip address dhcp setroute
!
ftp mode passive
dns domain-lookup inside
dns domain-lookup outside
object-group protocol TCPUDP
protocol-object udp
protocol-object udp
protocol-object tcp
object-group service DM_INLINE_TCP_1 tcp
port-object eq www
port-object eq ssh
port-object eq 5900
access-list outside_access_in extended permit tcp any host server-pub object-group DM_INLINE_TCP_1
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
static (inside,outside) interface server-pri netmask 255.255.255.255
access-group outside_access_in in interface outside
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
crypto ipsec transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
crypto ipsec transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5
crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map outside_map interface outside
crypto map inside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map inside_map interface inside
crypto isakmp enable inside
crypto isakmp enable outside
crypto isakmp policy 10
authentication crack
encryption aes-256
hash sha
group 2
lifetime 86400
crypto isakmp policy 20
authentication rsa-sig
encryption aes-256
hash sha
group 2
lifetime 86400
crypto isakmp policy 30
authentication pre-share
encryption aes-256
hash sha
group 2
lifetime 86400
crypto isakmp policy 40
authentication crack
encryption aes-192
hash sha
group 2
lifetime 86400
crypto isakmp policy 50
authentication rsa-sig
encryption aes-192
hash sha
group 2
lifetime 86400
crypto isakmp policy 60
authentication pre-share
encryption aes-192
hash sha
group 2
lifetime 86400
crypto isakmp policy 70
authentication crack
encryption aes
hash sha
group 2
lifetime 86400
crypto isakmp policy 80
authentication rsa-sig
encryption aes
hash sha
group 2
lifetime 86400
crypto isakmp policy 90
authentication pre-share
encryption aes
hash sha
group 2
lifetime 86400
crypto isakmp policy 100
authentication crack
encryption 3des
hash sha
group 2
lifetime 86400
crypto isakmp policy 110
authentication rsa-sig
encryption 3des
hash sha
group 2
lifetime 86400
crypto isakmp policy 120
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
crypto isakmp policy 130
authentication crack
encryption des
hash sha
group 2
lifetime 86400
crypto isakmp policy 140
authentication rsa-sig
encryption des
hash sha
group 2
lifetime 86400
crypto isakmp policy 150
authentication pre-share
encryption des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd auto_config outside
!
dhcpd address 192.168.1.5-192.168.1.36 inside
dhcpd enable inside
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
enable inside
enable outside
http-proxy server-pri 80
https-proxy server-pri 443
svc enable
tunnel-group-list enable
internal-password enable
group-policy DfltGrpPolicy attributes
webvpn
url-list value vpn
group-policy vpn_grppolicy internal
group-policy vpn_grppolicy attributes
vpn-tunnel-protocol webvpn
webvpn
url-list value vpn
username <REDACTED> password <REDACTED> encrypted privilege 0
username <REDACTED> attributes
vpn-group-policy DfltGrpPolicy
username <REDACTED> password <REDACTED> encrypted privilege 0
username <REDACTED> attributes
vpn-group-policy vpn_grppolicy
username <REDACTED> password <REDACTED> encrypted privilege 0
username <REDACTED> attributes
vpn-group-policy vpn_grppolicy
username <REDACTED> password <REDACTED> encrypted privilege 0
username <REDACTED> attributes
vpn-group-policy DfltGrpPolicy
tunnel-group ssl_vpn type remote-access
tunnel-group ssl_vpn general-attributes
default-group-policy vpn_grppolicy
tunnel-group sslvpn type remote-access
tunnel-group sslvpn webvpn-attributes
group-alias sslvpn enable
group-url https://
tunnel-group vpn-new type remote-access
tunnel-group vpn-new general-attributes
authorization-server-group LOCAL
default-group-policy vpn_grppolicy
tunnel-group vpn-new webvpn-attributes
group-alias vpn-new enable
group-url https://
group-url https://
group-url https://
without-csd
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect ip-options
!
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
Cryptochecksum:
: end
Thanks again for the help!
Tony
Message was edited by: Tony Scardina (Fixed spelling errors)
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