[Asterisk-Users] Asterisk handling of SIP info
Eric Wieling
eric at fnords.org
Fri Mar 18 11:51:28 MST 2005
Asterisk is not a SIP proxy.
Wei Su wrote:
> We encouter a situation where we need to use SIP info to convey infomation
> for one end point to another endpoint. I use asterisk to do the test and
> find asterisk does not forward the SIP info to another endpoint, but act as
> UAS and returns a 4xx error message. I think asterisk is not right to handle
> this SIP info message.
>
> In RFC 3261 Page 70 "This protocol is designed to be extended. Future
> extensions may define new methods and header fields at any time. An element
> MUST NOT refuse to proxy a request becasue it contains a method or header
> field it does not know about". In this case, asterisk does not understand
> this INFO message, so it acts as a UAS instead of proxy.
>
> How to let asterisk just forward this request to the other endpoint and
> instead processing it as a UAS?
>
> Thank you,
>
> Wei
>
>
>
>
> Here is the log from the asterisk server:
>
> Mar 17 12:01:31 WARNING[2804]: chan_sip.c:6134 receive_info: Unable to parse
> INFO message
>
>
> Here is the trace:
>
>
> Frame 96 (808 bytes on wire, 808 bytes captured)
> Session Initiation Protocol
> Request-Line: INFO sip:6002 at 192.168.10.90 SIP/2.0
> Method: INFO
> Resent Packet: False
> Message Header
> Call-ID: 60b8596c-4135c-c0a81e68 at 192.168.10.90
> From: Demo2<sip:6003 at 192.168.10.90;user=phone>;tag=221a0-a1cf
> SIP Display info: Demo2
> SIP from address: sip:6003 at 192.168.10.90
> SIP tag: 221a0-a1cf
> To: <sip:6002 at 192.168.10.90;user=phone>;tag=as6b294484
> SIP to address: sip:6002 at 192.168.10.90
> SIP tag: as6b294484
> CSeq: 102 INFO
> Via: SIP/2.0/UDP 192.168.10.164:5060
> Contact: Demo2<sip:6003 at 192.168.10.164:5060;user=phone>
> Max-Forwards: 70
> Supported: timer
> Proxy-Authorization: Digest
> username="6003",realm="asterisk",uri="sip:6002 at 192.168.10.90",response="034d
> 6b15ec1b2fa91f59c55d51c0a8e7",nonce="70c7fe86"
> Content-Type: application/media_control+xml
> Content-Length: 195
> Message body
> <?xml version="1.0" encoding="utf-8" ?>\n
> <media_control>\n
> <vc_primitive>\n
> <to_encoder>\n
> <picture_fast_update>\n
> </picture_fast_update>\n
> </to_encoder>\n
> </vc_primitive>\n
> </media_control>
>
>
> Frame 97 (430 bytes on wire, 430 bytes captured)
> Session Initiation Protocol
> Status-Line: SIP/2.0 415 Unsupported media type
> Status-Code: 415
> Resent Packet: False
> Message Header
> Via: SIP/2.0/UDP 192.168.10.164:5060
> From: Demo2<sip:6003 at 192.168.10.90;user=phone>;tag=221a0-a1cf
> SIP Display info: Demo2
> SIP from address: sip:6003 at 192.168.10.90
> SIP tag: 221a0-a1cf
> To: <sip:6002 at 192.168.10.90;user=phone>;tag=as6b294484
> SIP to address: sip:6002 at 192.168.10.90
> SIP tag: as6b294484
> Call-ID: 60b8596c-4135c-c0a81e68 at 192.168.10.90
> CSeq: 102 INFO
> User-Agent: Asterisk PBX
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER
> Contact: <sip:6002 at 192.168.10.90>
> Content-Length: 0
>
>
>
>
> ------------------------------------------------------------------------
>
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>
> ------------------------------------------------------------------------
>
> This message has been 'sanitized'. This means that potentially
> dangerous content has been rewritten or removed. The following
> log describes which actions were taken.
>
> Sanitizer (start="1111171580"):
> Part (pos="2669"):
> Part (pos="182"):
> SanitizeFile (filename="unnamed.txt", mimetype="text/plain"):
> Match (names="unnamed.txt", rule="1"):
> Enforced policy: accept
>
> Part (pos="3417"):
> SanitizeFile (filename="unnamed.html", mimetype="text/html"):
> Match (names="unnamed.html", rule="3"):
> ScanFile (file="/tmp/att-423b21fc-N8P-unnamed.html"):
> Scan succeeded, file is clean.
>
> Enforced policy: unknown
>
> Match (names="unnamed.html", rule="4"):
> Enforced policy: accept
>
> Note: Styles and layers give attackers many tools to fool the
> user and common browsers interpret Javascript code found
> within style definitions. References:
> - http://www.securityfocus.com/bid/630
> - http://archives.indenial.com/hypermail/bugtraq/2001/January2001/0512.html
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体_<<
> as: >>_FONT DEFANGED_face="宋体"_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_SPAN class=359343218-18032005_<<
> as: >>_DEFANGED_SPAN class=359343218-18032005_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/SPAN_<<
> as: >>_/DEFANGED_SPAN_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_DIV_<<
> as: >>_p__DEFANGED_DIV_<<
> Rewrote HTML tag: >>_FONT face=宋体 size=2_<<
> as: >>_FONT DEFANGED_face="宋体" size="2"_<<
> Rewrote HTML tag: >>_/DIV_<<
> as: >>_/p__DEFANGED_DIV_<<
>
> Part (pos="13954"):
> SanitizeFile (filename="unnamed.txt", mimetype="text/plain"):
> Match (names="unnamed.txt", rule="1"):
> Enforced policy: accept
>
> Total modifications so far: 91
>
>
> Anomy 0.0.0 : Sanitizer.pm
> $Id: Sanitizer.pm,v 1.89 2004/09/02 10:14:15 bre Exp $
--
Always do right. This will gratify some people and astonish the rest.
Mark Twain
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