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Merge pull request #11 from rocknsm/devel
Re-license scripts and update to latest compatibilities * Re-license everything under APL 2.0 * Disables GeoIP in conn logs by default * Disables Unified2 by default * Adds optional script to disable filesystem logging * Fixes Kafka output script to be compatible with current upstream release
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| Copyright (C) 2016, Missouri Cyber Team | ||
| All rights reserved. | ||
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| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are met: | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,15 @@ | ||
| # Copyright (C) 2016, Missouri Cyber Team | ||
| # All Rights Reserved | ||
| # See the file "LICENSE" in the main distribution directory for details | ||
| # Copyright (C) 2016-2018 RockNSM | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
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| @load ./rock | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| # Copyright (C) 2018 RockNSM | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
|
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| # Disable bro logging to filesystem for all logs | ||
| event bro_init() &priority=-5 | ||
| { | ||
| for (stream_id in Log::active_streams) | ||
| { | ||
| Log::remove_filter(stream_id, "default"); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,36 @@ | ||
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| ## Setup Kafka output | ||
| @load Bro/Kafka/logs-to-kafka | ||
| # Copyright (C) 2016-2018 RockNSM | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
| module Kafka; | ||
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| redef Kafka::topic_name = "bro-raw"; | ||
| redef Kafka::json_timestamps = JSON::TS_ISO8601; | ||
| redef Kafka::tag_json = F; | ||
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| # Enable bro logging to kafka for all logs | ||
| event bro_init() &priority=-5 | ||
| { | ||
| for (stream_id in Log::active_streams) | ||
| { | ||
| if (|Kafka::logs_to_send| == 0 || stream_id in Kafka::logs_to_send) | ||
| { | ||
| local filter: Log::Filter = [ | ||
| $name = fmt("kafka-%s", stream_id), | ||
| $writer = Log::WRITER_KAFKAWRITER, | ||
| $config = table(["stream_id"] = fmt("%s", stream_id)) | ||
| ]; | ||
|
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| Log::add_filter(stream_id, filter); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,14 @@ | ||
| # Copyright (C) 2016-2018 RockNSM | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
| @load ./main.bro |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| # Copyright (C) 2016-2018 RockNSM | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
|
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| ##! A script for handling URLs in SMTP traffic. This script does | ||
| ##! two things. It logs URLs discovered in SMTP traffic. It | ||
| ##! also records them in a bloomfilter and looks for them to be | ||
| ##! visited through HTTP requests. | ||
| ##! | ||
| ##! Authors: Aashish Sharma <asharma@lbl.gov> | ||
| ##! Seth Hall <seth@icir.org> | ||
| ##! Derek Ditch <derek@rocknsm.io> | ||
|
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|
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| @load base/utils/urls | ||
|
|
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| module SMTP_URL; | ||
|
|
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| export { | ||
| redef enum Log::ID += { Links_LOG }; | ||
|
|
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| type Info: record { | ||
| ## When the email was seen. | ||
| ts: time &log; | ||
| ## Unique ID for the connection. | ||
| uid: string &log; | ||
| ## Connection details. | ||
| id: conn_id &log; | ||
| ## Depth of the email into the SMTP exchange. | ||
| trans_depth: count &log; | ||
| ## The host field extracted from the discovered URL. | ||
| host: string &log &optional; | ||
| ## URL that was discovered. | ||
| url: string &log &optional; | ||
| }; | ||
|
|
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| redef enum Notice::Type += { | ||
| ## A link discovered in an email appears to have been clicked. | ||
| Link_in_Email_Clicked, | ||
|
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| ## An email was seen in email that matched the pattern in | ||
| ## `SMTP_URL::suspicious_urls` | ||
| Suspicious_URL, | ||
|
|
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| ## Certain file extensions in email links can be watched for | ||
| ## with the pattern in `SMTP_URL::suspicious_file_extensions` | ||
| Suspicious_File_Extension, | ||
|
|
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| ## URL with a dotted IP address seen in an email. | ||
| Dotted_URL | ||
| }; | ||
|
|
||
| const suspicious_file_extensions = /\.([rR][aA][rR]|[eE][xX][eE]|[zZ][iI][pP])$/ &redef; | ||
| const suspicious_urls = /googledocs?/ &redef; | ||
|
|
||
| const ignore_file_types = /\.([gG][iI][fF]|[pP][nN][gG]|[jJ][pP][gG]|[xX][mM][lL]|[jJ][pP][eE]?[gG]|[cC][sS][sS])$/ &redef; | ||
|
|
||
| ## The following | ||
| const ignore_mail_originators: set[subnet] = { } &redef; | ||
| const ignore_mailfroms = /bro@|alerts|reports/ &redef; | ||
| const ignore_notification_emails = {"alerts@example.com", "notices@example.com"} &redef; | ||
| const ignore_site_links = /http:\/\/.*\.example\.com\/|http:\/\/.*\.example\.net/ &redef; | ||
| } | ||
|
|
||
| # The bloomfilter that stores all of the links seen in email. | ||
| global mail_links_bf: opaque of bloomfilter; | ||
|
|
||
| redef record connection += { | ||
| smtp_url: Info &optional; | ||
| }; | ||
|
|
||
| event bro_init() &priority=5 | ||
| { | ||
| # initialize the bloomfilter | ||
| mail_links_bf = bloomfilter_basic_init(0.00000001, 10000000, "SMTP_URL"); | ||
|
|
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| Log::create_stream(Links_LOG, [$columns=Info]); | ||
| } | ||
|
|
||
| function extract_host(name: string): string | ||
| { | ||
| local split_on_slash = split_string(name, /\//); | ||
| return split_on_slash[3]; | ||
| } | ||
|
|
||
| function log_smtp_urls(c: connection, url: string) | ||
| { | ||
| c$smtp_url = Info($ts = c$smtp$ts, | ||
| $uid = c$uid, | ||
| $id = c$id, | ||
| $trans_depth = c$smtp$trans_depth, | ||
| $host = extract_host(url), | ||
| $url = url); | ||
|
|
||
| Log::write(SMTP_URL::Links_LOG, c$smtp_url); | ||
| } | ||
|
|
||
| event SMTP_URL::email_data(f: fa_file, data: string) | ||
| { | ||
| # Grab the connection. | ||
| local c: connection; | ||
| for ( cid in f$conns ) | ||
| { | ||
| c = f$conns[cid]; | ||
| break; | ||
| } | ||
|
|
||
| if( c$smtp?$mailfrom && ignore_mailfroms in c$smtp$mailfrom ) | ||
| { | ||
| return; | ||
| } | ||
|
|
||
| if ( c$smtp?$to ) | ||
| { | ||
| for ( to in c$smtp$to ) | ||
| { | ||
| if ( to in ignore_notification_emails ) | ||
| return; | ||
| } | ||
| } | ||
|
|
||
| local mail_info = Files::describe(f); | ||
| local urls = find_all_urls(data); | ||
| for ( link in urls ) | ||
| { | ||
| if ( ignore_file_types !in link ) | ||
| { | ||
| bloomfilter_add(mail_links_bf, link); | ||
| log_smtp_urls(c, link); | ||
|
|
||
| if ( suspicious_file_extensions in link ) | ||
| { | ||
| NOTICE([$note = Suspicious_File_Extension, | ||
| $msg = fmt("Suspicious file extension embedded in URL %s from %s", link, c$id$orig_h), | ||
| $sub = mail_info, | ||
| $conn = c]); | ||
| } | ||
|
|
||
| if ( suspicious_urls in link ) | ||
| { | ||
| NOTICE([$note = Suspicious_URL, | ||
| $msg = fmt("Suspicious text embedded in URL %s from %s", link, c$smtp$uid), | ||
| $sub = mail_info, | ||
| $conn = c]); | ||
| } | ||
|
|
||
| if ( /([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}.*/ in link ) | ||
| { | ||
| NOTICE([$note = Dotted_URL, | ||
| $msg = fmt("Embedded IP address in URL %s from %s", link, c$id$orig_h), | ||
| $sub = mail_info, | ||
| $conn = c]); | ||
| } | ||
|
|
||
| } | ||
| } | ||
| } | ||
|
|
||
| event file_over_new_connection(f: fa_file, c: connection, is_orig: bool) | ||
| { | ||
| if ( f$source == "SMTP" && c?$smtp && | ||
| c$id$orig_h !in ignore_mail_originators ) | ||
| { | ||
| Files::add_analyzer(f, Files::ANALYZER_DATA_EVENT, [$stream_event=SMTP_URL::email_data]); | ||
| } | ||
| } | ||
|
|
||
| event http_message_done(c: connection, is_orig: bool, stat: http_message_stat) &priority=-3 | ||
| { | ||
| local str = HTTP::build_url_http(c$http); | ||
| if ( bloomfilter_lookup(SMTP_URL::mail_links_bf, str) > 0 && | ||
| ignore_file_types !in str && | ||
| ignore_site_links !in str) | ||
| { | ||
| NOTICE([$note=SMTP_URL::Link_in_Email_Clicked, | ||
| $msg=fmt("URL %s ", str), | ||
| $conn=c]); | ||
| } | ||
| } |
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