Part 2 of 2
==ser.cfg=================================================================== ========================================
# # $Id: serconf.sh,v 1.3 2003/11/03 13:03:58 janakj Exp $ # # autogenerated SER configuration # # user: uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel) # system: Linux baltodb.popdial.com 2.6.10-1.760_FC3 #1 Wed Feb 2 00:14:23 EST 2005 i686 i686 i386 GNU/Linux # date: Sat Feb 26 02:57:50 EST 2005 #
# ----------- global configuration parameters ------------------------
/* debug=4 fork=yes port=5060 log_stderror=no memlog=5 */ mhomed=yes
fifo="/tmp/ser_fifo"
alias=baltodb.popdial.com
# uncomment to override config values for test # /* debug=4 # debug level (cmd line: -ddd) fork=yes port=5060 log_stderror=yes # (cmd line: -E) fifo="/tmp/ser_fifox" # */
check_via=no # (cmd. line: -v) dns=no # (cmd. line: -r) rev_dns=no # (cmd. line: -R) children=16 # if changing fifo mode to a more restrictive value, put # decimal value in there, e.g. dec(rw|rw|rw)=dec(666)=438 #fifo_mode=438
# ------------------ module loading ----------------------------------
loadmodule "/usr/local/lib/ser/modules/tm.so" loadmodule "/usr/local/lib/ser/modules/sl.so" loadmodule "/usr/local/lib/ser/modules/acc.so" loadmodule "/usr/local/lib/ser/modules/rr.so" loadmodule "/usr/local/lib/ser/modules/maxfwd.so" loadmodule "/usr/local/lib/ser/modules/mysql.so" loadmodule "/usr/local/lib/ser/modules/usrloc.so" loadmodule "/usr/local/lib/ser/modules/registrar.so" loadmodule "/usr/local/lib/ser/modules/auth.so" loadmodule "/usr/local/lib/ser/modules/auth_db.so" loadmodule "/usr/local/lib/ser/modules/textops.so" loadmodule "/usr/local/lib/ser/modules/uri.so" loadmodule "/usr/local/lib/ser/modules/group.so" loadmodule "/usr/local/lib/ser/modules/msilo.so" loadmodule "/usr/local/lib/ser/modules/enum.so" loadmodule "/usr/local/lib/ser/modules/uri_db.so"
# ----------------- setting module-specific parameters ---------------
# all DB urls here #modparam("usrloc|acc|auth_db|group|msilo|uri", "db_url","mysql://ser:heslo@localhost/ser") modparam("usrloc|acc|auth_db|group|msilo|uri_db", "db_url","mysql://ser:heslo@localhost/ser")
# -- usrloc params -- /* 0 -- dont use mysql, 1 -- write_through, 2--write_back */ modparam("usrloc", "db_mode", 2) modparam("usrloc", "timer_interval", 10)
# -- auth params --
modparam("auth_db", "calculate_ha1", yes) #modparam("auth_db", "user_column", "user_id") modparam("auth_db", "password_column", "password") modparam("auth", "nonce_expire", 300)
# -- rr params -- # add value to ;lr param to make some broken UAs happy modparam("rr", "enable_full_lr", 1)
# -- acc params -- # that is the flag for which we will account -- don't forget to modparam("acc", "db_flag", 1 ) modparam("acc", "db_missed_flag", 3 )
# -- tm params -- modparam("tm", "fr_timer", 20 ) modparam("tm", "fr_inv_timer", 90 ) modparam("tm", "wt_timer", 20 )
# -- msilo params modparam("msilo", "registrar", "sip:registrar@baltodb.popdial.com")
# -- enum params -- # modparam("enum", "domain_suffix", "e164.arpa.")
# ------------------------- request routing logic -------------------
# main routing logic
route{
/* ********* ROUTINE CHECKS ********************************** */
# filter too old messages if (!mf_process_maxfwd_header("10")) { log("LOG: Too many hops\n"); sl_send_reply("483","Alas Too Many Hops"); break; }; #if (len_gt( max_len )) { if ( msg:len > max_len ) { sl_send_reply("513", "Message too large sorry"); break; };
# Make sure that requests dont advertise addresses # from private IP space (RFC1918) in Contact HF # (note: does not match with folded lines) if (search("^(Contact|m): .*@(192.168.|10.|172.16)")) { # allow RR-ed requests, as these may indicate that # a NAT-enabled proxy takes care of it; unless it is # a REGISTER if ((method=="REGISTER" || ! search("^Record-Route:")) && !( src_ip==192.168.0.0/16 || src_ip==10.0.0.0/8 || src_ip==172.16.0.0/12 )) { log("LOG: Someone trying to register from private IP again\n"); sl_send_reply("479", "We dont accept private IP contacts" ); break; }; };
# anti-spam -- if somene claims to belong to our domain in From, # challenge him (skip REGISTERs -- we will chalenge them later) if (search("(From|F):.*(baltodb.popdial.com|66.159.88.19)")) { # invites forwarded to other domains, like FWD may cause subsequent # request to come from there but have iptel in From -> verify # only INVITEs (ignore FIFO/UAC's requests, i.e. src_ip==myself) if (method=="INVITE" & !(src_ip==69.19.88.19)) { if (!(proxy_authorize( "baltodb.popdial.com" /* realm */, "subscriber" /* table name */ ))) { proxy_challenge("baltodb.popdial.com" /* realm */, "0" /* no-qop */); break; }; # to maintain outside credibility of our proxy, we enforce # username in From to equal digest username; user with # "john.doe" id could advertise "bill.gates" in From otherwise; if (!check_from()) { log("LOG: From Cheating attempt in INVITE\n"); sl_send_reply("403", "That is ugly -- use From=id next time (OB)"); break; }; # we better don't consume credentials -- some requests may be # spiraled through our server (sfo@iptel->7141@iptel) and the # subsequent iteration may challenge too, for example because of # iptel claim in From; UACs then give up because they # already submitted credentials for the given realm #consume_credentials(); }; # INVITEs claiming to come from our domain } else if (method=="INVITE" && !(uri=~"[@:.](baltodb.popdial.com|66.159.88.19)([;:].*)*" # ... and we serve our gateway too if present | uri=~"@66.159.88.16([;:].*)*" )) { #the INVITE neither claims to come from our domain nor is it targeted to it # -> junk it sl_send_reply("403", "No relaying"); break; };
/* ********* RR ********************************** */ # to be safe, record route everything; UAs may use different # transport protocols and need to have SER in path record_route(); # if route forces us to forward to some explicit destination, # do so; check however first that a cheater didn't preload # a gateway destination to bypass PSTN ACLs
if (loose_route()) { if (uri=~"sip:[+0-9]+@66.159.88.16") { # it is gateway -- proceed to ACLs route(3); break; }; # route HF determined next hop; forward there append_hf("P-hint: rr-enforced\r\n"); t_relay(); break; };
/* ********* check for requests targeted out of our domain... ******* */ # sign of our domain: there is '@' (username) or : (nothing) in
# front of our domain name ; ('.' is not there -- we handle all # xxx.iptel.org as outbound hosts);if none of these cases matches, # proceed with processing of outbound requests in route[2] if (!(uri=~"[@:](sip[.)?(baltodb.popdial.com|66.159.88.19)([;:].*)*" | uri=~"@66.159.88.16([;:].*)*")) { route(2); break; };
/* ************ requests for our domain ********** */
/* now, the request is for sure for our domain */
# registers always MUST be authenticated to # avoid stealing incoming calls if (method=="REGISTER") {
# Make sure that user's dont register infinite loops # (note: does not match with folded lines) if (search("^(Contact|m): .*@(baltodb.popdial.com|66.159.88.19)")) { log(1, "LOG: alert: someone trying to set aor==contact\n"); sl_send_reply("476", "No Server Address in Contacts Allowed" ); break; }; if (search("^(Contact|m): .*66.159.88.16")) { log(1, "LOG: alert: protected contacts\n"); sl_send_reply("476", "No Server Address in Contacts Allowed" ); break; };
if (!www_authorize( "baltodb.popdial.com" /* realm */, "subscriber" /* table name */ )) { # challenge if none or invalid credentials www_challenge( "baltodb.popdial.com" /* realm */, "0" /* no qop -- some phones can't deal with it */); break; };
# prohibit attempts to grab someone else's To address # using valid credentials;
if (!check_to()) { log("LOG: To Cheating attempt\n"); sl_send_reply("403", "That is ugly -- use To=id in REGISTERs"); break; }; # it is an authenticated request, update Contact database now if (!save("location")) { sl_reply_error(); }; m_dump(); break; };
# some UACs might be fooled by Contacts our UACs generate to make MSN # happy (web-im, e.g.) -- tell its urneachable if (uri=~"sip:daemon@" ) { sl_send_reply("410", "daemon is gone"); break; };
# is this an ENUM destination (leading +?)? give it a try, if the lookup # doesn't change URI, just continue if (uri=~"sip:+[0-9]+@") { if (!enum_query("voice")) { # if parameter empty, it defaults to "e2u+sip" enum_query(""); # E2U+sip }; } else { # aliases (take precedences over PSTN number; provisioning interface # is set up to assinge aliases beginning with 8) lookup("aliases"); };
# check again, if it is still for our domain after aliases are resolved if (!(uri=~"[@:](sip[.)?(baltodb.popdial.com|66.159.88.19)([;:].*)*" | uri=~"@66.159.88.16([;:].*)*")) { route(5); break; };
# now check if it's about PSTN destinations through our gateway; # note that 8.... is exempted for numerical non-gw destinations if (uri=~"sip:+?[0-79][0-9]*@.*") { route(3); break; };
# native SIP destinations are handled using our USRLOC DB if (!lookup("location")) { # handle user which was not found ... route(4); break; }; # check whether some inventive user has uploaded gateway # contacts to UsrLoc to bypass our authorization logic if (uri=~"sip:[+0-9]+@66.159.88.16") { # it is gateway -- proceed to ACLs route(3); break; };
/* ... and also report on missed calls ... */ setflag(3);
# we now know we may, we know where, let it go out now! append_hf("P-hint: USRLOC\r\n"); if (!t_relay()) { sl_reply_error(); break; }; } #------------------- OUTBOUND ----------------------------------------
# routing logic for outbound requests targeted out of our domain # (keep in mind messages to our users can end up here too: for example, # an INVITE may be UsrLoc-ed, then the other party uses outbound # proxy with r-uri=the usr_loced addredd (typically IP)) route[2] { append_hf("P-hint: OUTBOUND\r\n"); t_relay(); }
#------- ALIASED OUTBOUND --------------------------------------------
# routing logic for inbound requests aliased outbound; unlike # with real outbound requests we do not force authentication # as these calls are server by our server and we do not want # to disqualify unathenticated request originatiors from other # domains route[5] { append_hf("P-hint: ALIASED-OUTBOUND\r\n"); t_relay(); }
#----------------- PSTN ----------------------------------------------
# logic for calls to the PSTN route[3] { # turn accounting on setflag(1);
/* require all who call PSTN to be members of the "int" group; apply ACLs only to INVITEs -- we don't need to protect other requests, as they don't imply charges; also it could cause troubles when a call comes in via PSTN and goes to a party that can't authenticate (voicemail, other domain) -- BYEs would fail then; exempt Cisco gateway from authentication by IP address -- it does not support digest */ if (method=="INVITE" && (!src_ip==69.19.88.16)) { if (!proxy_authorize( "baltodb.popdial.com" /* realm */, "subscriber" /* table name */)) { proxy_challenge( "baltodb.popdial.com" /* realm */, "0" /* no qop */ ); break; }; # let's check from=id ... avoids accounting confusion if (method=="INVITE" & !check_from()) { log("LOG: From Cheating attempt\n"); sl_send_reply("403", "That is ugly -- use From=id next time (gw)"); break; };
if(!is_user_in("credentials", "int")) { sl_send_reply("403", "NO PSTN Privileges..."); break; }; consume_credentials();
}; # INVITE to authorized PSTN
# if you have passed through all the checks, let your call go to GW! rewritehostport("69.19.88.16:5060");
# snom conditioner if (method=="INVITE" && search("User-Agent: snom")) { replace("100rel, ", ""); };
append_hf("P-hint: GATEWAY\r\n"); # use UDP to guarantee well-known sender port (TCP ephemeral) t_relay_to_udp("69.19.88.16","5060"); }
/* *********** handling of unavailable user ******************* */
route[4] { /**/ # message store if (method=="MESSAGE") { t_newtran(); if (m_store("0")) { t_reply("202", "Accepted for Later Delivery"); } else { t_reply("503", "Service Unavailable"); }; break; }; /**/ # non-Voip -- just send "off-line" if (!(method=="INVITE" || method=="ACK" || method=="CANCEL")) { sl_send_reply("404", "Not Found"); break; }; # voicemail subscribers ... t_newtran(); t_reply("404", "Not Found"); # we account missed incoming calls; previous statteful processing # guarantees that retransmissions are not accounted if (method=="INVITE") { acc_db_request("404 missed call", "missed_calls"); }; }
-
Glenn Dalgliesh