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Added hook to allow extending the intel log.

Browse source 
The extension mechanism is basically the one that Seth introduced with
his intel extensions. The main difference lies in using a hook instead
of an event. An example policy implements whitelisting.
This commit is contained in:
Jan Grashoefer 2016-05-11 23:27:51 +02:00
parent 859eb5eac7
commit cb33028702
5 changed files with 118 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

21
scripts/base/frameworks/intel/main.bro
View file

@ -165,6 +165,19 @@ export {
## data within the intelligence framework.
global match: event(s: Seen, items: set[Item]);
## This hook can be used to extend the intel log by adding data to the
## Info record. The default information is added with a priority of 5.
##
## info: The Info record that will be logged.
##
## s: Information about the data seen.
##
## items: The intel items that match the seen data.
##
## In case the hook execution is terminated using break, the match will
## not be logged.
global extend_match: hook(info: Info, s: Seen, items: set[Item]);
global log_intel: event(rec: Info);
}
@ -306,6 +319,12 @@ event Intel::match(s: Seen, items: set[Item]) &priority=5
{
local info = Info($ts=network_time(), $seen=s, $matched=TypeSet());
if ( hook extend_match(info, s, items) )
Log::write(Intel::LOG, info);
}
hook extend_match(info: Info, s: Seen, items: set[Item]) &priority=5
{
if ( s?$f )
{
s$fuid = s$f$id;
@ -340,8 +359,6 @@ event Intel::match(s: Seen, items: set[Item]) &priority=5
add info$sources[item$meta$source];
add info$matched[item$indicator_type];
}
Log::write(Intel::LOG, info);
}
function insert(item: Item)

30
scripts/policy/frameworks/intel/whitelist.bro Normal file
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@ -0,0 +1,30 @@
@load base/frameworks/intel
@load base/frameworks/notice
module Intel;
export {
redef record Intel::MetaData += {
## Add a field to indicate if this is a whitelisted item.
whitelist: bool &default=F;
};
}
hook Intel::extend_match(info: Info, s: Seen, items: set[Item]) &priority=9
{
local whitelisted = F;
for ( item in items )
{
if ( item$meta$whitelist )
{
whitelisted = T;
break;
}
}
if ( whitelisted )
# Prevent logging
break;
}

1
scripts/test-all-policy.bro
View file

@ -15,6 +15,7 @@
@load frameworks/dpd/detect-protocols.bro
@load frameworks/dpd/packet-segment-logging.bro
@load frameworks/intel/do_notice.bro
@load frameworks/intel/whitelist.bro
@load frameworks/intel/seen/__load__.bro
@load frameworks/intel/seen/conn-established.bro
@load frameworks/intel/seen/dns.bro

29
testing/btest/Baseline/scripts.policy.frameworks.intel.whitelisting/intel.log Normal file
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@ -0,0 +1,29 @@
#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path intel
#open 2016-05-11-19-38-30
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p fuid file_mime_type file_desc seen.indicator seen.indicator_type seen.where seen.node matched sources
#types time string addr port addr port string string string string enum enum string set[enum] set[string]
1300475168.853899 CPbrpk1qSsw6ESzHV4 141.142.220.118 43927 141.142.2.2 53 - - - upload.wikimedia.org Intel::DOMAIN DNS::IN_REQUEST bro Intel::DOMAIN source1
1300475168.854837 CIPOse170MGiRM1Qf4 141.142.220.118 40526 141.142.2.2 53 - - - upload.wikimedia.org Intel::DOMAIN DNS::IN_REQUEST bro Intel::DOMAIN source1
1300475168.857956 CMXxB5GvmoxJFXdTa 141.142.220.118 32902 141.142.2.2 53 - - - upload.wikimedia.org Intel::DOMAIN DNS::IN_REQUEST bro Intel::DOMAIN source1
1300475168.858713 Che1bq3i2rO3KD1Syg 141.142.220.118 59714 141.142.2.2 53 - - - upload.wikimedia.org Intel::DOMAIN DNS::IN_REQUEST bro Intel::DOMAIN source1
1300475168.891644 CEle3f3zno26fFZkrh 141.142.220.118 58206 141.142.2.2 53 - - - upload.wikimedia.org Intel::DOMAIN DNS::IN_REQUEST bro Intel::DOMAIN source1
1300475168.892414 CfTOmO0HKorjr8Zp7 141.142.220.118 59746 141.142.2.2 53 - - - upload.wikimedia.org Intel::DOMAIN DNS::IN_REQUEST bro Intel::DOMAIN source1
1300475168.893988 Cab0vO1xNYSS2hJkle 141.142.220.118 45000 141.142.2.2 53 - - - upload.wikimedia.org Intel::DOMAIN DNS::IN_REQUEST bro Intel::DOMAIN source1
1300475168.894787 Cx3C534wEyF3OvvcQe 141.142.220.118 48128 141.142.2.2 53 - - - upload.wikimedia.org Intel::DOMAIN DNS::IN_REQUEST bro Intel::DOMAIN source1
1300475168.916018 CJ3xTn1c4Zw9TmAE05 141.142.220.118 49997 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475168.916183 C7XEbhP654jzLoe3a 141.142.220.118 49996 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475168.918358 C3SfNE4BWaU4aSuwkc 141.142.220.118 49998 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475168.952296 CzA03V1VcgagLjnO92 141.142.220.118 49999 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475168.952307 CyAhVIzHqb7t7kv28 141.142.220.118 50000 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475168.954820 CkDsfG2YIeWJmXWNWj 141.142.220.118 50001 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475168.975934 CJ3xTn1c4Zw9TmAE05 141.142.220.118 49997 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475168.976436 C7XEbhP654jzLoe3a 141.142.220.118 49996 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475168.979264 C3SfNE4BWaU4aSuwkc 141.142.220.118 49998 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475169.014593 CzA03V1VcgagLjnO92 141.142.220.118 49999 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475169.014619 CyAhVIzHqb7t7kv28 141.142.220.118 50000 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
1300475169.014927 CkDsfG2YIeWJmXWNWj 141.142.220.118 50001 208.80.152.3 80 - - - upload.wikimedia.org Intel::DOMAIN HTTP::IN_HOST_HEADER bro Intel::DOMAIN source1
#close 2016-05-11-19-38-30

39
testing/btest/scripts/policy/frameworks/intel/whitelisting.bro Normal file
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@ -0,0 +1,39 @@
# @TEST-EXEC: bro -Cr $TRACES/wikipedia.trace %INPUT
# @TEST-EXEC: btest-diff intel.log
#@TEST-START-FILE intel.dat
#fields indicator indicator_type meta.source meta.desc meta.url
upload.wikimedia.org Intel::DOMAIN source1 somehow bad http://some-data-distributor.com/1
meta.wikimedia.org Intel::DOMAIN source1 also bad http://some-data-distributor.com/1
#@TEST-END-FILE
#@TEST-START-FILE whitelist.dat
#fields indicator indicator_type meta.source meta.desc meta.whitelist meta.url
meta.wikimedia.org Intel::DOMAIN source2 also bad T http://some-data-distributor.com/1
#@TEST-END-FILE
@load base/frameworks/intel
@load frameworks/intel/whitelist
@load frameworks/intel/seen
redef Intel::read_files += {
"intel.dat",
"whitelist.dat",
};
global total_files_read = 0;
event bro_init()
{
suspend_processing();
}
event Input::end_of_data(name: string, source: string)
{
# Wait until both intel files are read.
if ( /^intel-/ in name && (++total_files_read == 2) )
{
continue_processing();
}
}