AsteriskNOW authentication algorithm

Get help with installing and running AsteriskNOW.

Moderators: Moderator, Support

AsteriskNOW authentication algorithm

Postby pitr » Wed Apr 08, 2015 3:05 am

Hello everybody!

I'm trying to create a small SIP client in Visual Studio. I've managed to send a REGISTER message from the client pc to the AsteriskNOW PBX and receive the "401 Unauthorized" back with the WWW-Authenticate line. But now , I don't understand how to compute the MD5 response to the server... there are several parameters, and I cannot find anything on internet. the situation is the following:

DEVICES ADDRESSES:

IP PBX AsteriskNOW: 192.168.1.37
PC that sends the REGISTER message; 192.168.1.104
SIP account username: 117
SIP account password: abcd1234

REGISTER message

REGISTER sip:192.168.1.37 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.104:5060;branch=z9hG4bK213760691;rport
From: <sip:117@192.168.1.37>;tag=1270517038
To: <sip:117@192.168.1.37>
Call-ID: 1808066864-5060-1@BJC.BGI.B.D
CSeq: 2001 REGISTER
Contact: <sip:117@192.168.1.104:5060>;reg-id=1;
+sip.instance="<urn:uuid:00000000-0000-1000-8000-AABBCCDDEEFF>"
Max-Forwards: 70
User-Agent: Grandstream GXP1165 1.0.6.7
Supported: path
Expires: 3600
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER,
UPDATE, MESSAGE
Content-Length: 0

of course, at the line
+sip.instance="<urn:uuid:00000000-0000-1000-8000-AABBCCDDEEFF>"

there's the PC,s Network adapter MAC, instead of "AABBCCDDEEFF".

PBX Response

SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP
192.168.1.104:5060;rport=5060;received=192.168.1.104;branch=z9hG4bK213760691
Call-ID: 1808066864-5060-1@BJC.BGI.B.D
From: <sip:117@192.168.1.37>;tag=1270517038
To: <sip:117@192.168.1.37>;tag=z9hG4bK2137606914
CSeq: 2001 REGISTER
WWW-Authenticate: Digest
realm="asterisk",nonce="1428402653/99967d603c38695f1c328332db91a43b",
opaque="416e7e1767513798",algorithm=md5,qop="auth"
Server: FPBX-AsteriskNOW-12.0.43(13.0.1)
Content-Length: 0

Now, how can i compute the MD5 response to the server, and what should I add in the new REGISTER message?
I've searched a lot on the internet but all i found was a lot of different examples with lots of different parameters, it's a mess!

Thank you
pitr
Newsterisk
 
Posts: 1
Joined: Wed Apr 08, 2015 2:54 am

Re: AsteriskNOW authentication algorithm

Postby david55 » Thu Apr 09, 2015 1:06 am

This is far too specialist for an Asterisk NOW forum.

You can see how authentication is constructed by looking at the Asterisk source code, but I'm certain that the SIP RFC and the documents it references, all on the internet, adequately describe how to construct the authentication string.
david55
Moves Like Spencer
 
Posts: 12570
Joined: Fri Sep 26, 2008 5:03 am


Return to AsteriskNOW Support

Who is online

Users browsing this forum: Exabot [Bot] and 1 guest