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/etc/prelude-lml/ruleset/httpd.rules is in prelude-lml-rules 4.1.0-1.

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The actual contents of the file can be viewed below.

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#FULLNAME: Apache HTTP Server (httpd)
#VERSION: 1.0
#AUTHOR: Prelude Team <support.prelude@c-s.fr>
#DESCRIPTION: The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows. https://httpd.apache.org/docs/2.4/en/mod/core.html#errorlogformat. Versions supported : 2.2.x to 2.4.x.
#ID: 4100

#####
#
# Copyright (C) 2005 Ruben Alonso <1rualons@rigel.deusto.es>
# Copyright (C) 2005 G Ramon Gomez <gene at gomezbrothers dot com>
# Copyright (C) 2015-2017 CS-SI. All Rights Reserved.
#
# This file is part of the Prelude-LML program.
#
#####

#####
#
# Rules for Apache HTTP Server
#
# 4100 to 4149 : generic rules
# 4150 to 4179 : specific rules
# 4180 to 4199 : old apache (<2.4)
#
#####

#####
#
# Configuration for ruleset/pcre.conf:
#
# regex=[((\S+):|:|)(warn|error|crit|alert|emerg)\];               include = httpd.rules;
#
# For old apache (<2.4)
# regex=(\[error\]|Pass|httpd);                                    include = httpd.rules;
#
#####

regex=\[pid (\d+)\]; \
 id=4101; \
 target(0).process.pid=$1; \
 chained; silent;

regex=\[client (\S+?(?=:)|\S+)(:(\d+)|)\]; \
 id=4102; \
 source(0).node.address(0).address=$1; \
 chained; silent;

regex=\[host (\S+)\]; \
 id=4103; \
 target(0).node.address(0).address=$1; \
 chained; silent;

regex=referer: ([^,].+(?=,)|[^,]\S+); \
 id=4104; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=referrer; \
 additional_data(-1).data=$1; \
 chained; silent;

regex=(AH\d{5}): ([^,].+(?=,)|[^,].*); \
 id=4105; \
 classification.reference(0).name=$1; \
 classification.reference(0).url=https://wiki.apache.org/httpd/ListOfErrors; \
 classification.reference(0).meaning=$2; \
 classification.reference(0).origin=vendor-specific; \
 classification.text=$2; \
 chained; silent;

regex=\[(\S+):(warn|error|crit|alert|emerg)\]; \
 id=4106; \
 additional_data(0).type=string; \
 additional_data(0).meaning=apache module; \
 additional_data(0).data=$1; \
 chained; silent;

#LOG:[Sun Jan 31 18:26:01 2016] [error] [client 1.2.3.4] [host foo.cluster42.ovh.net] request failed: error reading the headers
regex=request failed: ([^,]*); \
 id=4150; \
 classification.text=request failed; \
 assessment.impact.completion=failed; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=error; \
 additional_data(-1).data=$1; \
 chained; silent;

#LOG:[Sun Jan 31 16:35:18 2016] [warn] [client 1.2.3.4] [host foo.ovh] [ovhconfig] syntax error in /homez.1337/foo/.ovhconfig:5
regex=syntax error in ([^,].+(?=,)|[^,]\S+); \
 id=4151; \
 classification.text=syntax error; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=file; \
 additional_data(-1).data=$1; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [:error] [pid 1337] [client 1.2.3.4:1234] script '/var/www/wordpress/wp-login.php' not found or unable to stat
regex=script '(\S+)' not found; \
 id=4152; \
 classification.text=script not found; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=script; \
 additional_data(-1).data=$1; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [error] [client 1.2.3.4] PHP Warning:  pg_connect():  in /var/wordpress/foo.php on line 666
#LOG:[Wed Oct 21 19:28:42 2015] [error] [client 1.2.3.4] PHP Notice:  Constant WP_DEBUG already defined in /var/www/wordpress/wp-config.php on line 42
#LOG:[Wed Oct 21 19:28:42 2015] [error] [client 1.2.3.4] PHP Fatal error:  Call to undefined method dbrc_wpdb::get_charset_collate() in /var/www/wordpress/wp-admin/includes/schema.php on line 512
regex=(PHP [^:].+(?=:)): (.*); \
 id=4153; \
 classification.text=$1; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=PHP error; \
 additional_data(-1).data=$2; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [warn] Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
regex=(RFC(\s|)(\d+)); \
 id=4154; \
 classification.reference(>>).name=$1; \
 classification.reference(-1).url=https://tools.ietf.org/html/rfc$3; \
 classification.reference(-1).origin=vendor-specific; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [error] (9)Bad file descriptor: apr_socket_accept: (client socket)
regex=Bad file descriptor; \
 id=4155; \
 classification.text=Bad file descriptor; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [error] [client 1.2.3.4] File does not exist: /var/www/wordpress/robots.txt
regex=File does not exist: ([^,].+(?=,)|[^,].*); \
 id=4156; \
 classification.text=File does not exist; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=file; \
 additional_data(-1).data=$1; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [error] [client 1.2.3.4] client denied by server configuration: /var/www/wordpress/wp-login.php
regex=client denied by server configuration: ([^,].+(?=,)|[^,].*); \
 id=4157; \
 classification.text=client denied by server configuration; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=url; \
 additional_data(-1).data=$1; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [error] [client 1.2.3.4] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /foobar.cgi
regex=client sent (\S+) request without hostname; \
 id=4158; \
 classification.text=client sent request without hostname; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=http protocol; \
 additional_data(-1).data=$1; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [error] Invalid URI in request GET HTTP/1.1 HTTP/1.1
regex=Invalid URI in request; \
 id=4159; \
 classification.text=Invalid URI in request; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [error] Directory index forbidden by Options directive: /var/www/wordpress/wp-includes/css/
regex=Directory index forbidden by (.*): ([^,].+(?=,)|[^,].*); \
 id=4160; \
 classification.text=Directory index forbidden by $1; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=path; \
 additional_data(-1).data=$2; \
 chained; silent;

#LOG:[Wed Oct 21 19:28:42 2015] [error] Hostname 10.11.12.13 provided via SNI and hostname *.foobar.com provided via HTTP are different
regex=Hostname (\S+) provided via (\S+) and hostname (\S+) provided via (\S+) are different; \
 id=4161; \
 classification.text=Hostnames are different; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.severity=low; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=hostname provided by $2; \
 additional_data(-1).data=$2; \
 additional_data(>>).type=string; \
 additional_data(-1).meaning=hostname provided by $4; \
 additional_data(-1).data=$3; \
 chained; silent;

#LOG:[Sun Feb 01 06:25:03 2015] [warn] Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366)
regex=Init:\s(.*); \
 id=4162; \
 classification.text=$1; \
 chained; silent;

#DESCRIPTION:Format : [<date>] (1) (2) (3) (4) <message> (5) where (1) = "[<module>:<level>]" or "[:<level>]" or "[<level>]", (2) = "[pid <pid>]" if PID exists, (3) = "[client <ip>]" if client exists, (4) = "<key> <value>]" or "[<value>]" n times with n >= 0, (5) = optional values like "<key>: <value>"
regex=\[((\S+):|:|)(warn|error|crit|alert|emerg)\](\s\[(\S+\s\S+|\S+)\]|){1,}(.*); \
 id=4100; \
 analyzer(0).name=Apache HTTP Server; \
 analyzer(0).manufacturer=https://httpd.apache.org; \
 analyzer(0).class=Service; \
 source(0).service.portlist=80,443; \
 source(0).service.iana_protocol_number=6; \
 target(0).service.iana_protocol_name=tcp; \
 target(0).service.iana_protocol_number=6; \
 target(0).service.name=http; \
 target(0).process.name=httpd; \
 assessment.impact.description=$6; \
 optgoto=4101-4106; \
 optgoto=4150-4162; \
 last

#DESCRIPTION:Web server - Error
#CATEGORY:Web Service
#LOG:[Sat Mar 12 22:56:12 2005] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico
#LOG:[Sat Mar 12 22:56:13 2005] [error] [client 127.0.0.1] Premature end of script headers: /var/www/sample/index.pl
#LOG:[Sat Mar 12 22:48:24 2005] [error] [client 127.0.0.1] Directory index forbidden by rule: /var/www/sample/
#LOG:[Sat Mar 12 22:38:41 2005] [error] [client 127.0.0.1] client denied by server configuration: /var/www/sample/
#LOG:[Sun Jan  2 22:42:47 2005] [error] [client 127.0.0.1] request failed: error reading the headers
#LOG:[Sun Jan  2 23:48:19 2005] [error] [client 127.0.0.1] request failed: URI too long
regex=\[error\] \[client ([\d\.]+)\] ((File|Premature|Directory|client|request)[\S+\s]+): (.+); \
 classification.text=Web server error; \
 id=4180; \
 revision=1; \
 analyzer(0).name=httpd; \
 analyzer(0).manufacturer=www.apache.org; \
 analyzer(0).class=Service; \
 assessment.impact.severity=low; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.description=Apache httpd '$2' error: '$4'; \
 source(0).node.address(0).category=ipv4-addr; \
 source(0).node.address(0).address=$1; \
 source(0).service.iana_protocol_name=tcp; \
 source(0).service.iana_protocol_number=6; \
 target(0).service.iana_protocol_name=tcp; \
 target(0).service.iana_protocol_number=6; \
 target(0).service.name=http; \
 last

#DESCRIPTION:Web server - Error
#CATEGORY:Web Service
#LOG:[Sat Apr 16 14:30:12 2005] [error] [client ::1] File does not exist: /var/www/favicon.ico
regex=\[error\] \[client ([A-Fa-f\d:]+)\] ((File|Premature|Directory|client|request)[\S+\s]+): (.+); \
 classification.text=Web server error; \
 id=4181; \
 revision=1; \
 analyzer(0).name=httpd; \
 analyzer(0).manufacturer=www.apache.org; \
 analyzer(0).class=Service; \
 assessment.impact.severity=low; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.description=Apache httpd '$2' error: '$4'; \
 source(0).node.address(0).category=ipv4-addr; \
 source(0).node.address(0).address=$1; \
 source(0).service.iana_protocol_name=tcp; \
 source(0).service.iana_protocol_number=6; \
 target(0).service.iana_protocol_name=tcp; \
 target(0).service.iana_protocol_number=6; \
 target(0).service.name=http; \
 last

#DESCRIPTION:Web server - SSL passphrase correct
#CATEGORY:Authentication
#LOG:Apr 17 12:58:51 mail httpd: OK: Pass Phrase Dialog successful.
regex=OK: Pass Phrase Dialog successful; \
 classification.text=Web server SSL passphrase correct; \
 id=4182; \
 revision=1; \
 analyzer(0).name=httpd; \
 analyzer(0).manufacturer=www.apache.org; \
 analyzer(0).class=Service; \
 assessment.impact.severity=low; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.description=Apache was started and an SSL passphrase was required. This passphrase was entered correctly.; \
 last

#DESCRIPTION:Web server - SSL passphrase incorrect
#CATEGORY:Authentication
#LOG:Apr 17 12:58:48 mail httpd: Apache:mod_ssl:Error: Pass phrase incorrect (5 more retries permitted).
regex=Error: Pass phrase incorrect \(; \
 classification.text=Web server SSL passphrase incorrect; \
 id=4183; \
 revision=1; \
 analyzer(0).name=httpd; \
 analyzer(0).manufacturer=www.apache.org; \
 analyzer(0).class=Service; \
 assessment.impact.severity=medium; \
 assessment.impact.completion=failed; \
 assessment.impact.type=other; \
 assessment.impact.description=Apache was started and an SSL passphrase was required. This passphrase was not entered correctly, but additional passphrase attempts will be allowed.; \
 last

#DESCRIPTION:Web server - SSL passphrase incorrect
#CATEGORY:Authentication
#LOG:Apr 17 14:00:48 mail httpd: Apache:mod_ssl:Error: Pass phrase incorrect.
regex=Error: Pass phrase incorrect\.; \
 classification.text=Web server SSL passphrase incorrect; \
 id=4184; \
 revision=1; \
 analyzer(0).name=httpd; \
 analyzer(0).manufacturer=www.apache.org; \
 analyzer(0).class=Service; \
 assessment.impact.severity=high; \
 assessment.impact.completion=failed; \
 assessment.impact.type=other; \
 assessment.impact.description=Apache was started and an SSL passphrase was required.  This passphrase was not entered correctly.  No additional passphrase attempts will be allowed.; \
 last

#DESCRIPTION:Web server - shutdown
#CATEGORY:Service Management
#LOG:Apr 17 14:00:13 mail httpd: httpd shutdown succeeded
regex=httpd shutdown succeeded; \
 classification.text=Web server shutdown; \
 id=4185; \
 revision=1; \
 analyzer(0).name=httpd; \
 analyzer(0).manufacturer=www.apache.org; \
 analyzer(0).class=Service; \
 assessment.impact.severity=medium; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.description=Apache httpd shutdown seen.; \
 target(0).service.name=http; \
 last

#DESCRIPTION:Web server - startup
#CATEGORY:Service Management
#LOG:Apr 17 14:02:41 mail httpd: httpd startup succeeded
regex=httpd startup succeeded; \
 classification.text=Web server startup; \
 id=4186; \
 revision=1; \
 analyzer(0).name=httpd; \
 analyzer(0).manufacturer=www.apache.org; \
 analyzer(0).class=Service; \
 assessment.impact.severity=info; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=other; \
 assessment.impact.description=Apache httpd startup seen.; \
 target(0).service.name=http; \
 last