[Serusers] Digest Authentication

Magnus Sörman (AL/EAB) magnus.sorman at ericsson.com
Thu Dec 30 11:15:58 CET 2004


Hi,

I need some help with digest authentication.
When I uncomment those lines in ser.cfg, the register msg stops to work. In the trace, see below, you can see the nonce being sent in the re-register msg, but the server still responds with 401 Unauthorized. I've tried with both 0 and 1 in the www_challenge.

Without the digest authentication the register works fine.

Thanks in advance,
  //Magnus

ser.cfg (ser 0.8.12 running on a Fedora box. Used for test purpose only):
====================================================
# ----------- global configuration parameters ------------------------

#debug=3         # debug level (cmd line: -dddddddddd)
#fork=yes
#log_stderror=no	# (cmd line: -E)

/* Uncomment these lines to enter debugging mode 
debug=7
fork=no
log_stderror=yes
*/

check_via=no	# (cmd. line: -v)
dns=no           # (cmd. line: -r)
rev_dns=no      # (cmd. line: -R)
#port=5060
#children=4
fifo="/tmp/ser_fifo"

sip_warning=no
 
alias="sip_server_ip"

# ------------------ module loading ----------------------------------

# Uncomment this if you want to use SQL database
loadmodule "/usr/lib/ser/modules/mysql.so"

loadmodule "/usr/lib/ser/modules/sl.so"
loadmodule "/usr/lib/ser/modules/tm.so"
loadmodule "/usr/lib/ser/modules/rr.so"
loadmodule "/usr/lib/ser/modules/maxfwd.so"
loadmodule "/usr/lib/ser/modules/usrloc.so"
loadmodule "/usr/lib/ser/modules/registrar.so"

loadmodule "/usr/lib/ser/modules/pa.so"

# Uncomment this if you want digest authentication
# mysql.so must be loaded !
loadmodule "/usr/lib/ser/modules/auth.so"
loadmodule "/usr/lib/ser/modules/auth_db.so"

# ----------------- setting module-specific parameters ---------------

# -- usrloc params --

#modparam("usrloc", "db_mode",   0)

# Uncomment this if you want to use SQL database 
# for persistent storage and comment the previous line
modparam("usrloc", "db_mode", 2)

# -- auth params --
# Uncomment if you are using auth module
#
modparam("auth_db", "calculate_ha1", yes)
#
# If you set "calculate_ha1" parameter to yes (which true in this config), 
# uncomment also the following parameter)
#
modparam("auth_db", "password_column", "password")

# -- rr params --
# add value to ;lr param to make some broken UAs happy
modparam("rr", "enable_full_lr", 1)


# -------------------------  request routing logic -------------------

# main routing logic

route{

	# initial sanity checks -- messages with
	# max_forwards==0, or excessively long requests
	if (!mf_process_maxfwd_header("10")) {
		sl_send_reply("483","Too Many Hops");
		break;
	};
	if ( msg:len > max_len ) {
		sl_send_reply("513", "Message too big");
		break;
	};

	# we record-route all messages -- to make sure that
	# subsequent messages will go through our proxy; that's
	# particularly good if upstream and downstream entities
	# use different transport protocol
	record_route();	
	# loose-route processing
	if (loose_route()) {
		t_relay();
		break;
	};

	# if the request is for other domain use UsrLoc
	# (in case, it does not work, use the following command
	# with proper names and addresses in it)

	if (uri == myself ) {

		if (method=="SUBSCRIBE") {
			if(t_newtran()){
				handle_subscription("registrar");
				break;
			};
		};
		
		if (method=="REGISTER") {

# Uncomment this if you want to use digest authentication
			if (!www_authorize("sip_server_ip", "subscriber")) {
				www_challenge("sip_server_ip", "1");
				break;
			};
			save("location");
			break;
		};

		# native SIP destinations are handled using our USRLOC DB
		if (!lookup("location")) {
			sl_send_reply("404", "Not Found");
			break;
		};
	};
	# forward to current uri now; use stateful forwarding; that
	# works reliably even if we forward from TCP to UDP
	if (!t_relay()) {
		sl_reply_error();
	};

}

Register trace:
==========
REGISTER sip:sip_server_ip SIP/2.0
Via: SIP/2.0/UDP local_pc_ip:5060;rport;branch=z9hG4bK4268DFDFE5EE410C8DB113A6223C800C
From: Magnus <sip:magnus at sip_server_ip>;tag=470300110
To: Magnus <sip:magnus at sip_server_ip>
Contact: "Magnus" <sip:magnus at local_pc_ip:5060>
Call-ID: EB7272E371C24F6C8F24DB47A53EE7CB at sip_server_ip
CSeq: 6590 REGISTER
Expires: 1800
Max-Forwards: 70
User-Agent: X-Lite release 1103m
Content-Length: 0

SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP local_pc_ip:5060;rport=5060;branch=z9hG4bK4268DFDFE5EE410C8DB113A6223C800C
From: Magnus <sip:magnus at sip_server_ip>;tag=470300110
To: Magnus <sip:magnus at sip_server_ip>;tag=b27e1a1d33761e85846fc98f5f3a7e58.0d0e
Call-ID: EB7272E371C24F6C8F24DB47A53EE7CB at sip_server_ip
CSeq: 6590 REGISTER
WWW-Authenticate: Digest realm="sip_server_ip", nonce="41d1321431d402c1af9617eb73deccbce7e532d5", qop="auth"
Server: Sip EXpress router (0.8.12 (i386/linux))
Content-Length: 0

REGISTER sip:sip_server_ip SIP/2.0
Via: SIP/2.0/UDP local_pc_ip:5060;rport;branch=z9hG4bK1813C486770C442BB51E58686A61921F
From: Magnus <sip:magnus at sip_server_ip>;tag=470300110
To: Magnus <sip:magnus at sip_server_ip>
Contact: "Magnus" <sip:magnus at local_pc_ip:5060>
Call-ID: EB7272E371C24F6C8F24DB47A53EE7CB at sip_server_ip
CSeq: 6591 REGISTER
Expires: 1800
Authorization: Digest username="magnus",realm="sip_server_ip",nonce="41d1321431d402c1af9617eb73deccbce7e532d5",response="27ea80aed1b9f5086b396c8f86bcec60",uri="sip:sip_server_ip",qop=auth,cnonce="9F5BBA98D6724D909C6560E8A045A300",nc=00000006
Max-Forwards: 70
User-Agent: X-Lite release 1103m
Content-Length: 0

SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP local_pc_ip:5060;rport=5060;branch=z9hG4bK1813C486770C442BB51E58686A61921F
From: Magnus <sip:magnus at sip_server_ip>;tag=470300110
To: Magnus <sip:magnus at sip_server_ip>;tag=b27e1a1d33761e85846fc98f5f3a7e58.9cf2
Call-ID: EB7272E371C24F6C8F24DB47A53EE7CB at sip_server_ip
CSeq: 6591 REGISTER
WWW-Authenticate: Digest realm="sip_server_ip", nonce="41d1321431d402c1af9617eb73deccbce7e532d5", qop="auth"
Server: Sip EXpress router (0.8.12 (i386/linux))
Content-Length: 0




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