[OpenSER-Users] Authentication problem in openSER - sr-users

22 May 2008


      hello all,
i am investigating the authentication on openSER. I search for a proper
explanations but unfortunately i did not find how it is exactly done so i
did some experiments. i assumed that the response is generated as the
following: note that i set the username and password with the same string
"alali"
Response = MD5( username + MD5(password) + realm +  nonce)
and in the openser.cfg i tell the server to take the username from the
header and set the password from the username since the username and the
password are the same (only for testing).
TEST1: setting modparam("auth", "calculate_ha1", 1) and telling the server
to expect a clear password
$avp(s:username) = $fU;
$avp(s:password) = $fU;
IT WORKS
TEST2:setting modparam("auth", "calculate_ha1", 0) and telling the server to
expect a hashed password
$avp(s:username) = $fU;
$avp(s:password) = $(fU{s.md5});
IT DOES NOT WORK
could anyone tell me how exactly the authentication is done in openSER? is
the response generated is like the one i assumed? what + means in the
response? does is mean concatenation or exoring?
if(!pv_www_authorize(""))
                {
                 www_challenge(""/*realm*/,"0"/*qop*/);
                 exit;
                }
            if (!save("location"))
              sl_reply_error();
           sl_send_reply("200", "ok");
           exit;