[Freeswitch-users] Security Issue

Ahmed Habiba ahabiba at gmail.com
Wed Jan 14 20:21:29 MSK 2015 

Thanks Brian,

What I got from the below link that unless having a record like the below in acl.conf.xml, Digest Authentication(i.e. username/password) will be required, please correct me.

https://wiki.freeswitch.org/wiki/Connect_Two_FreeSWITCH_Boxes <https://wiki.freeswitch.org/wiki/Connect_Two_FreeSWITCH_Boxes>
<node type="allow" cidr="10.10.0.1/32"/>


From: Brian West <brian at freeswitch.org <mailto:brian at freeswitch.org>>
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org <mailto:freeswitch-users at lists.freeswitch.org>>
Date: January 14, 2015 at 7:49:32 PM GMT+3
Reply-To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org <mailto:freeswitch-users at lists.freeswitch.org>>
Subject: Re: [Freeswitch-users] Security Issue


Unless you've changed the configs its not setup to do that out of the box.

On Wed, Jan 14, 2015 at 10:39 AM, Ahmed Habiba <ahabiba at gmail.com <mailto:ahabiba at gmail.com>> wrote:
Dear Brian,

Thank you really for your feedback, what you mentioned is correct, however I understand that any call to comes from external system to public context to processed , the external system IP shall be allowed via ACL, accordingly we shouldn't expect any traffic to processed from a server/IP that is not defined in the ACL, am I correct?

Thanks,

Ahmed Habiba.
From: Brian West <brian at freeswitch.org <mailto:brian at freeswitch.org>>
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org <mailto:freeswitch-users at lists.freeswitch.org>>
Date: January 14, 2015 at 7:29:28 PM GMT+3
Reply-To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org <mailto:freeswitch-users at lists.freeswitch.org>>
Subject: Re: [Freeswitch-users] Security Issue


You have some learning to do about VoIP and various security models.  See comments inline.

On Wed, Jan 14, 2015 at 10:08 AM, Ahmed Habiba <ahabiba at gmail.com <mailto:ahabiba at gmail.com>> wrote:
Dears,

Kindly I noticed a very strange behaviour on Freeswitch that may allow non authorised users to make call through the system below is the log and my notice highlighted, you help will be appreciated.

1-Below is a request coming from not authored IP.
2-However the originating IP is “142.54.179.218” the from is as below as if it is from the same server:

The IP was 142.54.179.218... thats the real IP we received the request from. 
 

freeswitch at internal> recv 770 bytes from udp/[142.54.179.218]:5070 at 16:41:34.211099:
   ------------------------------------------------------------------------
   INVITE  <> <>sip:9009972599796504 at 177.31.245.177:5080 <sip:9009972599796504 at 177.31.245.177:5080> SIP/2.0
   To: 9009972599796504< <> <>sip:9009972599796504 at 177.31.245.177 <sip:9009972599796504 at 177.31.245.177>>
   From: 1000< <> <>sip:1000 at 177.31.245.177 <sip:1000 at 177.31.245.177>>;tag=e8473b10
   Via: SIP/2.0/UDP 142.54.179.218:5070;branch=z9hG4bK-d6e1ddab827448435f49ecaf6e613e2e;rport
   Call-ID: d6e1ddab827448435f49ecaf6e613e2e
   CSeq: 1 INVITE
   Contact: < <> <>sip:1000 at 142.54.179.218:5070 <sip:1000 at 142.54.179.218:5070>>
   Max-Forwards: 70
   Allow: INVITE, ACK, CANCEL, BYE
   User-Agent: sipcli/v1.8
   Content-Type: application/sdp
   Content-Length: 285
   
   v=0
   o=sipcli-Session 1883669566 1798766211 IN IP4 142.54.179.218
   s=sipcli
   c=IN IP4 142.54.179.218
   t=0 0
   m=audio 5072 RTP/AVP 18 0 8 101
   a=fmtp:101 0-15
   a=rtpmap:18 G729/8000
   a=rtpmap:0 PCMU/8000
   a=rtpmap:8 PCMA/8000
   a=rtpmap:101 telephone-event/8000
   a=ptime:20
   a=sendrecv

3-Accordingly Freeswitch start to deal with the call normally

As it should, Its hitting the external profile which doesn't have authentication on it.
 


   ------------------------------------------------------------------------
send 333 bytes to udp/[142.54.179.218]:5070 at 16:41:34.211442:
   ------------------------------------------------------------------------
   SIP/2.0 100 Trying
   Via: SIP/2.0/UDP 142.54.179.218:5070;branch=z9hG4bK-d6e1ddab827448435f49ecaf6e613e2e;rport=5070
   From: 1000< <> <>sip:1000 at 177.31.245.177 <sip:1000 at 177.31.245.177>>;tag=e8473b10
   To: 9009972599796504< <> <>sip:9009972599796504 at 177.31.245.177 <sip:9009972599796504 at 177.31.245.177>>
   Call-ID: d6e1ddab827448435f49ecaf6e613e2e
   CSeq: 1 INVITE
   Content-Length: 0
   
   ————————————————————————————————————

4-as we can see below Freeswitch consider the call coming from my server IP not from the remote IP(My server IP = 177.31.245.177)

No thats false, This is just a channel named thats formed from various bits of data, Its meaningless data and can be set, overridden or changed.  This has no bearing on what freeswitch thinks.  Most likely its using the host element from the From header.
 

2015-01-14 16:41:34.203196 [NOTICE] switch_channel.c:1055 New Channel sofia/external/1000 at 177.31.245.177 <mailto:1000 at 177.31.245.177> [d1879400-9c03-11e4-8cd6-2f1eb174d7b4]
2015-01-14 16:41:34.203196 [DEBUG] switch_core_session.c:1053 Send signal sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> [BREAK]
2015-01-14 16:41:34.203196 [DEBUG] switch_core_session.c:1053 Send signal sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> [BREAK]
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:472 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) Running State Change CS_NEW
2015-01-14 16:41:34.203196 [DEBUG] sofia.c:8812 sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> receiving invite from 142.54.179.218:5070 <http://142.54.179.218:5070/> version: 1.4.13 git b942d0f 2014-11-03 19:53:00Z 64bit
2015-01-14 16:41:34.203196 [DEBUG] sofia.c:6606 Channel sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> entering state [received][100]
2015-01-14 16:41:34.203196 [DEBUG] sofia.c:6616 Remote SDP:
v=0
o=sipcli-Session 1883669566 1798766211 IN IP4 142.54.179.218
s=sipcli
c=IN IP4 142.54.179.218
t=0 0
m=audio 5072 RTP/AVP 18 0 8 101
a=rtpmap:18 G729/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20

2015-01-14 16:41:34.203196 [DEBUG] sofia.c:6868 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) State Change CS_NEW -> CS_INIT
2015-01-14 16:41:34.203196 [DEBUG] switch_core_session.c:1388 Send signal sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> [BREAK]
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:491 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) State NEW
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:472 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) Running State Change CS_INIT
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:512 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) State INIT
2015-01-14 16:41:34.203196 [DEBUG] mod_sofia.c:87 sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> SOFIA INIT
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:40 sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> Standard INIT
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:48 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) State Change CS_INIT -> CS_ROUTING
2015-01-14 16:41:34.203196 [DEBUG] switch_core_session.c:1388 Send signal sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> [BREAK]
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:512 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) State INIT going to sleep
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:472 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) Running State Change CS_ROUTING
2015-01-14 16:41:34.203196 [DEBUG] switch_channel.c:2184 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) Callstate Change DOWN -> RINGING
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:528 (sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177>) State ROUTING
2015-01-14 16:41:34.203196 [DEBUG] mod_sofia.c:123 sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> SOFIA ROUTING
2015-01-14 16:41:34.203196 [DEBUG] switch_core_state_machine.c:166 sofia/external/1000 at 177.31.245.177 <mailto:sofia/external/1000 at 177.31.245.177> Standard ROUTING

This is someone from outside calling in to your system, the public context is a sandbox to allow you to isolate and route non-authenticated traffic to your internal contexts via the transfer app, per the vanilla config examples.  This is also whey you need to understand how to secure FreeSWITCH.

 
2015-01-14 16:41:34.203196 [INFO] mod_dialplan_xml.c:558 Processing 1000 <1000>->9009972599796504 in context public



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