mirror of
https://github.com/zeek/zeek.git
synced 2025-10-02 14:48:21 +00:00
142 lines
3.5 KiB
Text
142 lines
3.5 KiB
Text
@load ./main
|
|
@load base/utils/conn-ids
|
|
@load base/frameworks/files
|
|
@load base/files/x509
|
|
|
|
module KRB;
|
|
|
|
export {
|
|
redef record Info += {
|
|
# Client certificate
|
|
client_cert: Files::Info &optional;
|
|
# Subject of client certificate, if any
|
|
client_cert_subject: string &log &optional;
|
|
# File unique ID of client cert, if any
|
|
client_cert_fuid: string &log &optional;
|
|
|
|
# Server certificate
|
|
server_cert: Files::Info &optional;
|
|
# Subject of server certificate, if any
|
|
server_cert_subject: string &log &optional;
|
|
# File unique ID of server cert, if any
|
|
server_cert_fuid: string &log &optional;
|
|
};
|
|
|
|
## Default file handle provider for KRB.
|
|
global get_file_handle: function(c: connection, is_orig: bool): string;
|
|
|
|
## Default file describer for KRB.
|
|
global describe_file: function(f: fa_file): string;
|
|
}
|
|
|
|
function get_file_handle(c: connection, is_orig: bool): string
|
|
{
|
|
# Unused. File handles are generated in the analyzer.
|
|
return "";
|
|
}
|
|
|
|
function describe_file(f: fa_file): string
|
|
{
|
|
if ( f$source != "KRB_TCP" && f$source != "KRB" )
|
|
return "";
|
|
|
|
if ( ! f?$info || ! f$info?$x509 || ! f$info$x509?$certificate )
|
|
return "";
|
|
|
|
# It is difficult to reliably describe a certificate - especially since
|
|
# we do not know when this function is called (hence, if the data structures
|
|
# are already populated).
|
|
#
|
|
# Just return a bit of our connection information and hope that that is good enough.
|
|
for ( cid in f$conns )
|
|
{
|
|
if ( f$conns[cid]?$krb )
|
|
{
|
|
local c = f$conns[cid];
|
|
return cat(c$id$resp_h, ":", c$id$resp_p);
|
|
}
|
|
}
|
|
|
|
return cat("Serial: ", f$info$x509$certificate$serial, " Subject: ",
|
|
f$info$x509$certificate$subject, " Issuer: ",
|
|
f$info$x509$certificate$issuer);
|
|
}
|
|
|
|
event bro_init() &priority=5
|
|
{
|
|
Files::register_protocol(Analyzer::ANALYZER_KRB_TCP,
|
|
[$get_file_handle = KRB::get_file_handle,
|
|
$describe = KRB::describe_file]);
|
|
|
|
Files::register_protocol(Analyzer::ANALYZER_KRB,
|
|
[$get_file_handle = KRB::get_file_handle,
|
|
$describe = KRB::describe_file]);
|
|
}
|
|
|
|
event file_over_new_connection(f: fa_file, c: connection, is_orig: bool) &priority=5
|
|
{
|
|
if ( f$source != "KRB_TCP" && f$source != "KRB" )
|
|
return;
|
|
|
|
local info: Info;
|
|
|
|
if ( ! c?$krb )
|
|
{
|
|
info$ts = network_time();
|
|
info$uid = c$uid;
|
|
info$id = c$id;
|
|
}
|
|
else
|
|
info = c$krb;
|
|
|
|
if ( is_orig )
|
|
{
|
|
info$client_cert = f$info;
|
|
info$client_cert_fuid = f$id;
|
|
}
|
|
else
|
|
{
|
|
info$server_cert = f$info;
|
|
info$server_cert_fuid = f$id;
|
|
}
|
|
|
|
c$krb = info;
|
|
|
|
Files::add_analyzer(f, Files::ANALYZER_X509);
|
|
# Always calculate hashes. They are not necessary for base scripts
|
|
# but very useful for identification, and required for policy scripts
|
|
Files::add_analyzer(f, Files::ANALYZER_MD5);
|
|
Files::add_analyzer(f, Files::ANALYZER_SHA1);
|
|
}
|
|
|
|
function fill_in_subjects(c: connection)
|
|
{
|
|
if ( !c?$krb )
|
|
return;
|
|
|
|
if ( c$krb?$client_cert && c$krb$client_cert?$x509 && c$krb$client_cert$x509?$certificate )
|
|
c$krb$client_cert_subject = c$krb$client_cert$x509$certificate$subject;
|
|
|
|
if ( c$krb?$server_cert && c$krb$server_cert?$x509 && c$krb$server_cert$x509?$certificate )
|
|
c$krb$server_cert_subject = c$krb$server_cert$x509$certificate$subject;
|
|
}
|
|
|
|
event krb_error(c: connection, msg: Error_Msg)
|
|
{
|
|
fill_in_subjects(c);
|
|
}
|
|
|
|
event krb_as_response(c: connection, msg: KDC_Response)
|
|
{
|
|
fill_in_subjects(c);
|
|
}
|
|
|
|
event krb_tgs_response(c: connection, msg: KDC_Response)
|
|
{
|
|
fill_in_subjects(c);
|
|
}
|
|
|
|
event connection_state_remove(c: connection)
|
|
{
|
|
fill_in_subjects(c);
|
|
}
|