On 25.06.2012 14:44, Vitaliy Aleksandrov wrote:
Hi All,
After reading default kamailio configuration i can't understand why does
kamailio remove preloaded route headers from the incoming initial INVITE
before calling record_route().
remove_hf("Route");
if (is_method("INVITE|SUBSCRIBE"))
record_route();
Pre-loaded route sets can be used to abuse the proxy as an open relay.
This is bad. If a request hits my proxy, then I want to define how the
message is routed, and I do not want to route the message like somebody
else wants it.
What will happen if an INVITE comes from another SIP proxy which wants
to stay in the middle of the dialogue ?
Only "Route" headers are removed, not "Record-Route" headers which
create the route-set.
For example, during Re-INVITE UA from our local site will construct
in-dialog INVITE with R-URI taken from the remote contact and send it to
our local proxy according to RR. Local proxy will process it in
route[WITHNDLG] where loose_route() function will remove top most RR
header because it points to us and since there is no more RR records
forward the request to a destination from the R-URI. As i understand in
that case remote proxy will not receive any in-dialog requests from us.
Sure it does. As only the pre-loaded route is remove, not the
Record-Route headers. Thus, the in-dialog route set is not affected,
only the out-of-dialog route set (pre-loaded) is manipulated.
regards
Klaus
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