[SR-Users] major bug in auth module?

Juha Heinanen jh at tutpro.com
Wed Mar 16 09:03:29 CET 2011


one sip ua sent this kind of authorization header:

Authorization: Digest
username="foo",realm="bar",uri="xxx",response="e439fa7438452da7d50690f2268be16f",nonce="4d8060d2000041b2430e64fe7ec681d8fb5709e9c72b8a01",qop=auth,cnonce="0004ccb0",nc=000060a2.

and sr auth module didn't like it but emitted error message
FIXME:check_nonce: bad nc value.  i went and checked the code and found
this:

		if (nc_enabled && (pf & NF_VALID_NC_ID) && auth->digest.nc.s &&
				auth->digest.nc.len){
			if (str2int(&auth->digest.nc, &nc)!=0){
				/* error, bad nc */
				ERR("FIXME:check_nonce: bad nc value %.*s\n",
						auth->digest.nc.len, auth->digest.nc.s);
				return 5; /* invalid nc */
			}

i.e., looks like it is using str2int to convert to nc value to int.  the
problem is that str2int only handles decimal strings, whereas nc value
is a hex string.

am i dreaming or what?

-- juha



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