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Move lookup_addr when statement

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Move the when statement to a function so that the connection record is
not in scope. Cloning a connection record is an expensive operation and
this avoids it and this avoids it.
This commit is contained in:
Justin Azoff 2016-08-17 10:41:41 -04:00
parent eebd896f63
commit f9b3f739e4
1 changed files with 16 additions and 11 deletions
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27
scripts/policy/protocols/ssh/interesting-hostnames.bro
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@ -27,21 +27,26 @@ export {
/^ftp[0-9]*\./ &redef;
}
event ssh_auth_successful(c: connection, auth_method_none: bool)
function check_ssh_hostname(id: conn_id, host: addr)
{
for ( host in set(c$id$orig_h, c$id$resp_h) )
when ( local hostname = lookup_addr(host) )
{
when ( local hostname = lookup_addr(host) )
if ( interesting_hostnames in hostname )
{
if ( interesting_hostnames in hostname )
{
NOTICE([$note=Interesting_Hostname_Login,
$msg=fmt("Possible SSH login involving a %s %s with an interesting hostname.",
Site::is_local_addr(host) ? "local" : "remote",
host == c$id$orig_h ? "client" : "server"),
$sub=hostname, $conn=c]);
}
NOTICE([$note=Interesting_Hostname_Login,
$msg=fmt("Possible SSH login involving a %s %s with an interesting hostname.",
Site::is_local_addr(host) ? "local" : "remote",
host == id$orig_h ? "client" : "server"),
$sub=hostname, $id=id]);
}
}
}
event ssh_auth_successful(c: connection, auth_method_none: bool)
{
for ( host in set(c$id$orig_h, c$id$resp_h) )
{
check_ssh_hostname(c$id, host);
}
}