[Linphone-users] Some info about Digest Auth

[Dermot McGahon]

Hi Simon,

I've been looking into why Digest Auth isn't working when registering
to a Tadiran PABX, here's what I've found out so far.

RFC 2617 says that qop "SHOULD be used if the server indicated that qop
is supported by providing a qop directive in the WWW-Authenticate header
field". And that if qop is sent, cnonce and nonce-count MUST be sent with
it.

The PABX seems to be requiring auth with qop=auth and cnonce/nonce-count
returned.

It would probably be good practice nonetheless to include these in auth
responses?

jauth.c/eXosip_create_authorization_header() sets CNonce to NULL but does
pass Qop and NonceCount into the digest calculation.

DigestCalcResponse() has some code that used these for qop=auth-int, and
it looks wrong that it also applies this to qop=auth. But anyway, I don't
think any of that code is compiled in at present.

libosip seems to have enough support for adding qop/cnonce/nc to the
response header but I'm not sure how to go about choosing a valid value
for cnonce.

I'm not really sure how to proceed. What do others know about this?


Dermot.
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