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Add cpanel decoders and rules. #1036

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bf0c989
Add cpanel decoders and rules.
Jan 27, 2017
8d6a66b
Fix broken cpanel-access-failed decoder failing tests
Jan 30, 2017
e5f636e
Merge branch 'master' into cpanel
alex-front Jan 30, 2017
fc5939d
Add support for cpanel rules to other setup types: agent, local, hybrid.
Jan 30, 2017
205b643
Merge branch 'cpanel' of github.com:alex-front/ossec-hids into cpanel
Jan 30, 2017
fbf75a8
Fix cpanel rules and decoders.
Feb 3, 2017
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64 changes: 64 additions & 0 deletions etc/decoder.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -2896,4 +2896,68 @@ Jul 26 13:57:56 mx1.example.org outbound/smtp: 127.0.0.1 1406297159-06f4a35b4df2
<order>srcip,url</order>
</decoder>


<!-- cPanel decoder.
- Examples:
- [2016-11-18 09:32:19 +0000] info [cpsrvd] 10.1.5.19 - admin "POST /login/?login_only=1 HTTP/1.1" FAILED LOGIN whostmgrd: user password hash is missing from system (user probably does not exist)
- [2016-04-18 13:07:02 +0400] info [cpsrvd] 10.1.5.19 - root - SUCCESS LOGIN whostmgrd
-->
<decoder name="cpanel-login">
<prematch>^[\S+ \S+ \S+] info [cpsrvd] \S+ -</prematch>
<regex>info [cpsrvd] (\S+) - (\S+)</regex>
<order>srcip,user</order>
</decoder>

<!-- cPanel decoder.
Because of default postgresql decoder overwrites cpanel-login-log rule in case time offset with minus (-0500). This rule is necessary to cover all cases of logs
- Examples:
- [2016-11-21 04:14:58 -0500] info [cpsrvd] 10.1.5.19 - admin "POST /login/?login_only=1 HTTP/1.1" FAILED LOGIN whostmgrd: user password hash is missing from system (user probably does not exist)
- [2017-01-25 03:16:27 -0500] info [cpsrvd] 10.1.5.19 - root "POST /login/?login_only=1 HTTP/1.1" FAILED LOGIN whostmgrd: user password incorrect
- [2017-01-25 05:37:47 -0500] info [cpsrvd] 10.1.5.19 - root "POST /login/?login_only=1 HTTP/1.1" FAILED LOGIN cpaneld: root login is not permitted to cpaneld
- [2017-01-25 06:01:10 -0500] info [cpsrvd] 10.1.5.19 - test "POST /login/?login_only=1 HTTP/1.1" FAILED LOGIN cpaneld: invalid cpanel user test (loadcpdata failed)
- [2017-01-25 06:08:58 -0500] info [cpsrvd] 10.1.5.19 - test@domain.com "POST /login/?login_only=1 HTTP/1.1" FAILED LOGIN whostmgrd: login attempt to whm by a non-reseller/root
- [2016-04-18 13:07:02 -0400] info [cpsrvd] 10.1.5.19 - root - SUCCESS LOGIN whostmgrd
- [2016-04-18 13:07:13 -0400] info [cpsrvd] 10.1.5.19 - root - SUCCESS LOGIN cpaneld
- [2016-04-18 13:07:15 -0400] info [cpsrvd] 10.1.5.19 - reseller (possessor: root) - SUCCESS LOGIN cpaneld
- [2016-04-18 13:08:24 -0400] info [cpsrvd] 10.1.5.19 - reseller - SUCCESS LOGIN webmaild
- [2016-04-18 13:08:27 -0400] info [cpsrvd] 10.1.5.19 - emailaccount@reseller.com (possessor: reseller) - SUCCESS LOGIN webmaild
-->

<decoder name="cpanel-login2">
<parent>postgresql_log</parent>
<prematch offset="after_parent">^info [cpsrvd] \S+ -</prematch>
<regex>info [cpsrvd] (\S+) - (\S+)</regex>
<order>srcip,user</order>
</decoder>

<!-- cPanel decoder.
- Examples:
- 10.1.5.19 - paul [11/18/2016:09:35:43 -0000] "GET" FAILED LOGIN cpdavd: Could not fetch system home directory for paul
-->

<decoder name="cpanel-access-failed">
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@ddpbsd ddpbsd Jan 27, 2017

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It looks like this decoder is causing the failures, but I'm not sure why yet.

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@ddpbsd ddpbsd Jan 27, 2017

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The log message associated with this didn't seem to match a decoder (at least on my setup), so using this decoder things seem to work so far:

<decoder name="cpanel-access-failed">
  <!--<parent>web-accesslog</parent>
  <prematch offset="after_parent">^FAILED LOGIN</prematch>-->
  <prematch>^\S+ \S+ \S+ [\d\d/\d\d/\d\d\d\d:\d\d:\d\d:\d\d \S*\d+] "\S+" FAILED LOGIN</prematch>-->
  <regex>^(\S+) \S+ (\S+)</regex>
  <order>srcip,user</order>
</decoder>

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@alex-front alex-front Jan 30, 2017

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I have tested your proposed decoder and I am confirming it is working as expected and CI tests are passing. I have added the fix to pull request. Please merge.

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@alex-front alex-front Feb 2, 2017

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I think the postgresql_log log decoder should be fixed to avoid clashes with and duplication of the cpanel decoders and rules like I proposed.

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@ddpbsd ddpbsd Feb 2, 2017

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What's wrong with the postgresql_log decoder exactly?

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@alex-front alex-front Feb 3, 2017 •
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The problem with postgresql_log decoder is that it will decode messages like:
'[2017-02-03 01:21:31 -0500]' and not like '[2017-02-03 01:21:31 +0500]' (note the '+' sign). So to handle both cases I had to duplicate all rules and decoders for cpanel. One way to avoid this is to fix the postgresql_log decoder to be more specific to avoid it clashing with cpanel decoders altogether but I don't have much knowledge of their log format so can't propose how to do it.

<parent>web-accesslog</parent>
<prematch offset="after_parent">FAILED LOGIN</prematch>
<regex>^(\S+) \S+ (\S+)</regex>
<order>srcip,user</order>
</decoder>

<!-- cPanel decoder.
- Examples:
- [2017-01-25 06:15:38 -0500] info [cpsrvd] 10.1.5.19 PURGE root:Nmm4xzhSpA2Sddv3 logout
- [2017-01-25 06:15:38 +0000] info [cpsrvd] 10.1.5.19 PURGE root:Nmm4xzhSpA2Sddv3 logout
-->
<decoder name="cpanel-session">
<prematch>^[\S+ \S+ \S+] info [cpsrvd] \S+ PURGE</prematch>
<regex>info [cpsrvd] (\S+) \S+ (\w+):</regex>
<order>srcip,user</order>
</decoder>

<decoder name="cpanel-session2">
<parent>postgresql_log</parent>
<prematch offset="after_parent">^info [cpsrvd] \S+ PURGE</prematch>
<regex>info [cpsrvd] (\S+) \S+ (\w+):</regex>
<order>srcip,user</order>
</decoder>

<!-- EOF -->
17 changes: 17 additions & 0 deletions etc/ossec-server.conf
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Expand Up @@ -72,6 +72,7 @@
<include>sysmon_rules.xml</include>
<include>opensmtpd_rules.xml</include>
<include>local_rules.xml</include>
<include>cpanel_rules.xml</include>
</rules>


Expand Down Expand Up @@ -201,4 +202,20 @@
<log_format>apache</log_format>
<location>/var/www/logs/error_log</location>
</localfile>

<localfile>
<log_format>syslog</log_format>
<location>/usr/local/cpanel/logs/login_log</location>
</localfile>

<localfile>
<log_format>syslog</log_format>
<location>/usr/local/cpanel/logs/access_log</location>
</localfile>

<localfile>
<log_format>syslog</log_format>
<location>/usr/local/cpanel/logs/session_log</location>
</localfile>

</ossec_config>
78 changes: 78 additions & 0 deletions etc/rules/cpanel_rules.xml
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@@ -0,0 +1,78 @@
<!-- Authors: Alexandr Garaga, Paul Klymenko
-
- This program is a free software; you can redistribute it
- and/or modify it under the terms of the GNU General Public
- License (version 2) as published by the FSF - Free Software
- Foundation.
-
- License details: http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
-->

<!-- cPanel messages -->
<group name="syslog,">

<!-- Two same rules but with different decoders because logs have different format -->
<rule id="11000" level="5">
<if_sid>2501</if_sid>
<decoded_as>cpanel-login</decoded_as>
<regex>FAILED LOGIN</regex>
<description>Possible attack on the cpanel services</description>
</rule>

<rule id="11001" level="5">
<if_sid>50500</if_sid>
<decoded_as>postgresql_log</decoded_as>
<regex>FAILED LOGIN</regex>
<description>Possible attack on the cpanel services</description>
</rule>

<rule id="11002" level="5">
<if_sid>2501</if_sid>
<decoded_as>web-accesslog</decoded_as>
<regex>FAILED LOGIN</regex>
<description>Possible attack on the cpanel services</description>
</rule>

<!-- We raise level to send alert considering frequency (6 see doc why) and timeframe (6 minutes) -->
<rule id="11003" level="10" frequency="4" timeframe="360">
<if_matched_sid>11001</if_matched_sid>
<description>Possible breakin attempt</description>
</rule>

<rule id="11004" level="10" frequency="4" timeframe="360">
<if_matched_sid>11000</if_matched_sid>
<description>Possible breakin attempt</description>
</rule>

<rule id="11005" level="10" frequency="4" timeframe="360">
<if_matched_sid>11002</if_matched_sid>
<description>Possible breakin attempt</description>
</rule>

<rule id="11006" level="3">
<decoded_as>cpanel-login</decoded_as>
<match>SUCCESS LOGIN</match>
<description>Cpanel login success</description>
</rule>

<rule id="11007" level="3">
<if_sid>50500</if_sid>
<decoded_as>postgresql_log</decoded_as>
<match>SUCCESS LOGIN</match>
<description>Cpanel login success</description>
</rule>

<rule id="11008" level="3">
<decoded_as>cpanel-session</decoded_as>
<match>PURGE</match>
<description>Cpanel session purge</description>
</rule>

<rule id="11009" level="3">
<if_sid>50500</if_sid>
<decoded_as>postgresql_log</decoded_as>
<match>PURGE</match>
<description>Cpanel session purge</description>
</rule>

</group> <!-- SYSLOG -->