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GH-1119: add base/protcols/conn/removal-hooks.zeek

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This adds two new functions: `Conn::register_removal_hook()` and
`Conn::unregister_removal_hook()` for registering a hook function to be
called back during `connection_state_remove`.  The benefit of using hook
callback approach is better scalability: the overhead of unrelated
protocols having to dispatch no-op `connection_state_remove` handlers is
avoided.
This commit is contained in:
Jon Siwek 2020-09-10 21:19:14 -07:00
parent 49e2047da0
commit 05cf511f18
31 changed files with 659 additions and 386 deletions
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11
scripts/base/protocols/krb/main.zeek
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@ -1,9 +1,10 @@
##! Implements base functionality for KRB analysis. Generates the kerberos.log
##! file.
module KRB;
@load ./consts
@load base/protocols/conn/removal-hooks
module KRB;
export {
redef enum Log::ID += { LOG };
@ -63,6 +64,9 @@ export {
## Event that can be handled to access the KRB record as it is sent on
## to the logging framework.
global log_krb: event(rec: Info);
## Kerberos finalization hook. Remaining Kerberos info may get logged when it's called.
global finalize_krb: Conn::RemovalHook;
}
redef record connection += {
@ -87,6 +91,7 @@ function set_session(c: connection): bool
c$krb = Info($ts = network_time(),
$uid = c$uid,
$id = c$id);
Conn::register_removal_hook(c, finalize_krb);
}
return c$krb$logged;
@ -228,7 +233,7 @@ event krb_tgs_response(c: connection, msg: KDC_Response) &priority=-5
do_log(c);
}
event connection_state_remove(c: connection) &priority=-5
hook finalize_krb(c: connection)
{
do_log(c);
}