8 Jan
2007
8 Jan
'07
11:12 p.m.
Thomas Gelf schrieb:
Same problem here. As I make intensive use of
uac_auth() and need to
authenticate against Proxies sending me the qop parameter in their
authentication challenge, in the meantime I helped myself by simply
commenting out the "goto error" section in modules/uac/auth_hdr.c.
I just changed
I already used this "fix" to ignore the qop value and from my opinion
it should be OK if qop=auth, because the result of the digest should
be the same for qop = "auth" or unspecified see page 14 in the
following draft of an example
http://www.softarmor.com/wgdb/docs/draft-smith-sip-auth-examples-00.txt
but! by this way the Authenticated Request from OpenSER does not
contains qop="auth" in the response which is maybe a problem for
some gateways.
case QOP_STATE:
/* TODO - add qop support */
LOG(L_ERR,"ERROR:uac:parse_authenticate_body: no qop
support "
"for the moment :-(\n");
goto error;
auth->qop = val;
break;
to
case QOP_STATE:
/* TODO - add qop support */
break;
somewhere around line 215.
Sure, that's not the way things should be solved -
but at the moment
it fits my needs. And as of RFC 2617 I should be fine - not sure about
RFC3261. Section 22.4(.8) states that "the 'qop' parameter must unfor-
tunately remain optional for clients and servers to receive" - so imo
it should be ok. (?)
To be sincere I did never REALLY understand this whole qop thingy. Afaik
OpenSER isn't able to increment cseq in it's UAC module as this module
doesn't have any dialog support. And in my believes that's why the UAC
module has been designed to fail if it recieves a challenge containing
qop (because it isn't able to do it the right way).
I believe that the fail is wanted to be able to forward the 401|407 to the
calling client which is maybe able to answer a challenge which contains qop
Nonetheless with my little "patch"
everything "just works":
-> UAC module sends an INVITE request
-> remote sends it's 407 message, containing nonce and qop (but no
cnonce)
-> 407 gets acknowledged
-> UAC module ignores the qop (as error handling is commented out) and
sends a new INVITE request with the correct nonce (and is therefore
doing correct digest authentication) but with wrong cseq (eg same
cseq as previous INVITE = cseq supplied from client)
but the response does not
contains the chosen qop value
-> remote party (proxy asking for authentication)
accepts my INVITE
I'm doing so since AVP support has been added to uac_auth() - see also
http://www.openser.org/pipermail/devel/2006-March/002162.html and it
worked fine with all versions of OpenSER I compiled since this date.
It would be great if (unless cseq incrementation support will once be
added to UAC) upstream sources could comment out this section (as I
showed above).
I don't see any grave issues in doing so - and it would probably help
people who need this feature. Would such a modification be an option for
OpenSER 1.2? You could also add an optional swich like
I think we can save the
time to build a modparam, this time could be
better used
for a final solution, because it's still not working with qoq="auth-int"
or qop="auth-int, auth"
and if it's really needed everybody can uncomment and compile it self.
I found an answer from Bogdan in the devel list that the cseq and qop
limits will not be removed with 1.2
http://www.mail-archive.com/devel@openser.org/msg04951.html
but I hope in the next roadmap for 1.3 it can be changed for optional to
todo to get this feature......
modparam("uac","ignore_qop",1);
Please let me know if you like my proposal or if
I'm talking bullshit :)
no it's not bullshit ;-) as the problem is really
old.......
regards,
Andreas
Kind regards,
Thomas Gelf
Andreas Heise schrieb:
Hello,
since a lot of providers has change there authentication to qop="auth"
the uac_auth(); function of the uac module can't use anymore.
by google I found a lot of requests for qop with uac_auth and also
the official feature request 1345887.
Is a target date known for a solution, maybe it's possible with 1.2.0?
Feature Request [ 1345887 ] Implement qop functionality in uac module
p.s.: I know it's on the road map, but it is needed so often......
thanks.
Andreas
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