11 May
2020
11 May
'20
2:32 p.m.
Hello,
if you have this topology:
[freeswitch] ====> [kamailio] ====> [gateway]
and the gateway is sending back 407, the I would still use freeswitch to
do the authentication, otherwise you need dialog module in kamailio to
track cseq changes. FreeSwitch originates the call and then can increase
the cseq as it needs. If the gateway is a proxy (e.g., another
Kamailio), then cseq increase is not needed and you can just do it with
uac module without dialog module.
Regarding your question of adding the Proxy-Authorization header in the
first INVITE, that can work sometimes if you know the nonce the gateway
is going to use, which can be the case of caching the nonce when
receiving the 407 first time and reusing it later. However, the nonce
typically is invalidated after a while (or even on first usage), so
reusing it is not going to work always. Which is for good reasons,
otherwise there can be reply-attacks.
Cheers,
Daniel
On 10.05.20 18:53, Edward Romanenco wrote:
Hi!
I've using a SIP setup that includes both Kamailio & Freeswitch,
invites are passed from Freeswitch and relayed by Kamailio to various
dispatchers, I would like to have Kamailio authenticating when Proxy
Authentication is required.
As I understood, this can be achieved with the help of a failure
route, problem is, when I'm utilizing this method - the 407 response
gets reverted back to Freeswitch, which returns the revised invite
filled with the default Freeswitch username/password, how can let
Kamailio handle the authentication once receiving the 407? Can I work
straight without relying on a failure route, but having the Proxy
Authentication header on my original invite?
This is my relevant configuration -
route[RELAY] {
if (is_method("INVITE|BYE|SUBSCRIBE|UPDATE")) {
if(!t_is_set("branch_route")) {
t_on_branch("MANAGE_BRANCH");
}
}
if (is_method("INVITE|SUBSCRIBE|UPDATE")) {
if(!t_is_set("onreply_route")) {
t_on_reply("MANAGE_REPLY");
}
}
if (is_method("INVITE")) {
if(!t_is_set("failure_route")) {
t_on_failure("KAM_AUTH");
}
}
if (!t_relay()) {
sl_reply_error();
}
exit;
}
failure_route[KAM_AUTH] {
if(t_check_status("401|407")) {
$avp(auser) = "xxx";
$avp(apass) = "yyy";
t_on_failure("OUTGOING_FAILURE");
uac_auth();
t_relay();
exit;
}
}
Edward
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Daniel-Constantin Mierla -- www.asipto.com
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