Issue with blocking one site on ASA

patrikandreasson — Tue, 12 Mar 2019 06:03:21 GMT

Hi,

I am trying to block a Web page, I have followed this guide. http://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/100513-ASARegexp.html

But unfortunately that blocks (almost) all web pages. What I mean with almost all is that I´ve tried to access quite many webpages, none works except google.com for some reason.
I have gone through the guide many times and double-checked the settings, I have also checked that regxp is correct by running the test function.

For testing purposes I´ve tried to block this webpage regex domainlist1 "\.op\.se"

I have tried to only set DomainBlockClass in the http_inspection_policy, just to be sure that none of the BlockURLClass or AppHeaderClass would interfere.

This is part of the configuration, I have bolded the MPF part.

Result of the command: "sh run"

: Saved
:
ASA Version 9.0(1)
!
hostname gbgASA
enable password xxxxx encrypted
passwd xxxxx encrypted
names
ip local pool anyVPNPool 10.10.10.10-10.10.10.50 mask 255.255.255.0
!
interface Ethernet0/0
switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
!
interface Ethernet0/7
!
interface Vlan1
nameif inside
security-level 100
ip address 192.168.50.3 255.255.255.0
!
interface Vlan2
nameif outside-telia
security-level 0
ip address xxxxx 255.255.255.248
!
regex urllist1 ".*\.([Ee][Xx][Ee]|[Cc][Oo][Mm]|[Bb][Aa][Tt]) HTTP/1.[01]"
regex urllist2 ".*\.([Pp][Ii][Ff]|[Vv][Bb][Ss]|[Ww][Ss][Hh]) HTTP/1.[01]"
regex urllist3 ".*\.([Dd][Oo][Cc]|[Xx][Ll][Ss]|[Pp][Pp][Tt]) HTTP/1.[01]"
regex urllist4 ".*\.([Zz][Ii][Pp]|[Tt][Aa][Rr]|[Tt][Gg][Zz]) HTTP/1.[01]"
regex domainlist1 "\.op\.se"
regex contenttype "Content-Type"
regex applicationheader "application/.*"
ftp mode passive
clock timezone CEST 1
clock summer-time CEDT recurring last Sun Mar 2:00 last Sun Oct 3:00
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface

object-group service httpgrp tcp
port-object eq 8080
access-list inside_access_in extended permit ip any any
access-list inside_access_in extended permit object-group DM_INLINE_SERVICE_3 any4 any inactive
access-list inside_access_in extended permit gre any any inactive
access-list inside_mpc extended permit object http any any
access-list inside_mpc extended permit tcp any any object-group httpgrp
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside-telia 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
!
object network obj_any
nat (inside,outside-telia) dynamic interface
object network vpn_nat_outside
nat (any,outside-telia) dynamic interface
access-group inside_access_in in interface inside
access-group outside-telia_access_in in interface outside-telia
route outside-telia 0.0.0.0 0.0.0.0 194.237.1.57 128
timeout xlate 3:00:00
timeout pat-xlate 0:00:30
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
user-identity default-domain LOCAL
http server enable
http 192.168.1.0 255.255.255.0 inside
http 192.168.50.0 255.255.255.0 inside
http 192.168.42.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart

dhcpd auto_config outside-telia
!
threat-detection basic-threat
threat-detection statistics port
threat-detection statistics protocol
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
ntp server 193.228.143.12 source outside-telia prefer

!
class-map global-class
match default-inspection-traffic
class-map type regex match-any DomainBlockList
match regex domainlist1
class-map type regex match-any URLBlockList
match regex urllist3
match regex urllist4
match regex urllist1
match regex urllist2
class-map type inspect http match-all BlockURLClass
match request uri regex class URLBlockList
class-map type inspect http match-all asdm_medium_security_methods
match not request method post
match not request method get
match not request method head
class-map type inspect http match-all BlockDomainClass
match request header host regex class DomainBlockList
class-map type inspect http match-all AppHeaderClass
match request header regex contenttype regex applicationheader
class-map type inspect http match-all asdm_high_security_methods
match not request method get
match not request method head
class-map httptraffic
match access-list inside_mpc
!
!
policy-map type inspect http http_inspection_policy
parameters
protocol-violation action drop-connection
match request method connect
drop-connection log
class BlockURLClass
reset log
class AppHeaderClass
drop-connection log
class BlockDomainClass
reset log
policy-map global-policy
class global-class
inspect ftp
inspect pptp
inspect dns
inspect icmp
inspect icmp error
inspect http
policy-map inside-policy
class httptraffic
inspect http http_inspection_policy
!
service-policy global-policy global
service-policy inside-policy interface inside
prompt hostname context
no call-home reporting anonymous
hpm topN enable
: end

Any help is appreciated

Thanks in advance,

Patrik

Hi,if i am not wrong , I

Vibhor Amrodia — Sat, 06 Jun 2015 02:15:42 GMT

Hi,

if i am not wrong , I think only the HTTPS Websites are working for you ?

Can you remove these REGEX and attached classes and see of this resolves the issue:-

regex contenttype "Content-Type"
regex applicationheader "application/.*"

Thanks and Regards,

Vibhor Amrodia

Hi and thanks for replying

patrikandreasson — Mon, 08 Jun 2015 07:37:11 GMT

Hi and thanks for replying.

Yes, you were correct, it´s https that are working.
I tried removing these
regex urllist1 ".*\.([Ee][Xx][Ee]|[Cc][Oo][Mm]|[Bb][Aa][Tt]) HTTP/1.[01]"
regex urllist2 ".*\.([Pp][Ii][Ff]|[Vv][Bb][Ss]|[Ww][Ss][Hh]) HTTP/1.[01]"
regex urllist3 ".*\.([Dd][Oo][Cc]|[Xx][Ll][Ss]|[Pp][Pp][Tt]) HTTP/1.[01]"
regex urllist4 ".*\.([Zz][Ii][Pp]|[Tt][Aa][Rr]|[Tt][Gg][Zz]) HTTP/1.[01]"
regex contenttype "Content-Type"
regex applicationheader "application/.*"

But it made no difference

Hi,try to remove this Policy

Vibhor Amrodia — Mon, 08 Jun 2015 14:14:55 GMT

Hi,

try to remove this Policy itself and see if this works:-

no service-policy inside-policy interface inside

Thanks and Regards,

Vibhor Amrodia

But if I remove that service

patrikandreasson — Tue, 09 Jun 2015 11:27:05 GMT

But if I remove that service policy rule I will at the same time remove http_inspection_policy which contains the Domain Class to block www.op.se.
If I may ask, what do you want to achieve by removing that rule?

Or am I missing something 🙂

topic Hi,if i am not wrong , I in Network Security

Issue with blocking one site on ASA

Hi,if i am not wrong , I

Hi and thanks for replying

Hi,try to remove this Policy

But if I remove that service