[SR-Users] Dynamic UAC Registration

[Mack Hendricks]

Hey All,

So, I want to use the UAC module to handle Digest Auth to upstream carriers.  But, I don’t know which carrier will be selected until another module (dRouting in this case) tells the logic which carrier to use.

I can see in the logs that the uac_auth function can capture the Auth Realm.  But, I need to access it from the Kamailio script so that I can lookup the credentials for that realm and then call uac_auth.  I’ve tried getting the info from $ar, but that gives me the realm of the inbound request versus the realm of the upstream carrier.  Also, I’ve tried using $T_rpl($ar), but that returns 0.  Here’s my logic from the Kamailio file:


        if(t_check_status("401|407")) {
                $var(reply_realm) = $T_rpl($ar);
                $var(query)="select auth_username,auth_password from uacreg where realm='" + $var(reply_realm) + "'";
                sql_xquery("cb","$var(query)","rb");
                xlog("L_DEBUG","[MANAGE_FAILURE: Proxy Auth]: The query is $var(query) auth realm is $var(reply_realm) and the user name is $xavp(rb=>auth_username)");
                $avp(auser) = $xavp(rb=>auth_username);
                $avp(apass) = $xavp(rb=>auth_password);
                uac_auth();
                t_relay();
                exit;`
        }


A snippet of the log file is below:

Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: exec: *** cfgtrace:failure_route=[DEFAULT_ROUTE] c=[/etc/kamailio/kamailio.cfg] l=1616 a=63 n=assign
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: exec: *** cfgtrace:failure_route=[DEFAULT_ROUTE] c=[/etc/kamailio/kamailio.cfg] l=1617 a=63 n=assign
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: exec: *** cfgtrace:failure_route=[DEFAULT_ROUTE] c=[/etc/kamailio/kamailio.cfg] l=1618 a=24 n=uac_auth
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: DEBUG: uac [auth.c:409]: uac_auth(): picked reply is 0x7f900cb7eaf0, code 407
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: DEBUG: uac [auth.c:225]: get_autenticate_hdr(): looking for header "Proxy-Authenticate"
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: DEBUG: uac [auth.c:429]: uac_auth(): header found; body=<Digest realm="sip.flowroute.com", nonce="XERJMlxESAbDNCK3INmBfoET1GGxpcyr", qop="auth">
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: DEBUG: uac [auth_hdr.c:209]: parse_authenticate_body(): <realm>="sip.flowroute.com" state=2
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: DEBUG: uac [auth_hdr.c:209]: parse_authenticate_body(): <nonce>="XERJMlxESAbDNCK3INmBfoET1GGxpcyr" state=3
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: DEBUG: uac [auth_hdr.c:209]: parse_authenticate_body(): <qop>="auth" state=1
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: DEBUG: uac [auth.c:449]: uac_auth(): no credential for realm "sip.flowroute.com"
Jan 20 10:05:58 dsiprouter /usr/sbin/kamailio[2871]: exec: *** cfgtrace:failure_route=[DEFAULT_ROUTE] c=[/etc/kamailio/kamailio.cfg] l=1619 a=24 n=t_relay


Thanks in advance for any help

Mack Hendricks
dSIPRouter
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