692 lines
20 KiB
Markdown
692 lines
20 KiB
Markdown
Description
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===========
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Fully automated Installation and configuration of ossec-servers and ossec-agents
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Manage the key generation and distribution between a server and multiple agents
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Clean queues on the server if needed (rid)
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Requirements
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============
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Any of:
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* Ubuntu 12.04+
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* Debian 7.0+
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* CentOS 6.0+
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(should work with ossec systems if you have the packages)
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Attributes
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==========
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# General Attributes
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The attributes below follow the same namespace syntax that OSSEC does. Refer to
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the official [OSSEC Documentation](http://www.ossec.net/doc/syntax/ossec_config.html)
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for more information.
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Default attributes from the cookbook:
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default["ossec"]["version"] = "2.8"
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default["ossec"]["syslog_output"]["ip"] = "127.0.0.1"
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default["ossec"]["syslog_output"]["port"] = "514"
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default["ossec"]["syslog_output"]["min_level"] = "5"
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default["ossec"]["receiver_port"] = "1514"
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default["ossec"]["log_alert_level"] = "1"
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default["ossec"]["email_alert_level"] = "7"
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default["ossec"]["agents"] = {}
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Default attributes from the ossec-server role:
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"ossec" => {
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"email_notification" => 'yes',
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"email_to" => [
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'ossec@example.net',
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],
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"email_from" => 'ossec-server@example.net',
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"email_idsname" => 'ossec',
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"smtp_server" => 'localhost',
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"white_list" => [
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'127.0.0.1',
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'10.1.0.0/16'
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],
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"email_alerts" => {
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'recipient@example.net' => {
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'level' => '9',
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'group' => 'syscheck',
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'event_location_tag' => 'reputation',
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'event_location_search' => 'roles:*mongodb*',
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'format' => 'sms',
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'rule_id' => '100001',
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'tags' => [
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'do_not_delay',
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'do_not_group'
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]
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}
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},
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"server" => {
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"service_name" => 'ossec-hids-server'
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},
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"syscheck" => {
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"frequency" => '7200',
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"alert_new_files" => 'yes',
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"auto_ignore" => 'no',
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"directories" => {
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'/bin' => {
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'report_changes' => 'no',
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'realtime' => 'yes'
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},
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'/sbin' => {
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'report_changes' => 'no',
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'realtime' => 'yes'
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},
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'/usr/bin' => {
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'report_changes' => 'no',
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'realtime' => 'yes'
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},
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'/usr/sbin' => {
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'report_changes' => 'no',
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'realtime' => 'yes'
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},
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'/etc' => {
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'report_changes' => 'yes',
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'realtime' => 'yes'
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},
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'/tmp' => {
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'report_changes' => 'yes',
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'realtime' => 'no'
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}
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},
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"ignore" => {
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'/etc/openvpn/openvpn-status.log' => {},
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'/etc/motd' => {},
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'/etc/mcollective/facts.yaml' => {},
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'/etc/blkid.tab' => {},
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'/etc/mtab' => {},
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'/etc/mail/statistics => {}',
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'/etc/random-seed' => {},
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'/etc/adjtime' => {},
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'/etc/prelink.cache' => {},
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'/etc/dnscache/stats' => {},
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'/etc/dnscache/log' => {},
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'/etc/dnscache2/stats' => {},
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'/etc/dnscache2/log' => {},
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'/etc/tinydns/stats' => {},
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'/etc/tinydns/log' => {}
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}
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},
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"syslog_files" => {
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'/var/log/syslog' => {},
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'/var/log/auth.log' => {},
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'/var/log/daemon.log' => {},
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'/var/log/kern.log' => {},
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'/var/log/mail.log' => {},
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'/var/log/user.log' => {},
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'/var/log/cron.log' => {}
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}
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```email_alerts``` is a hash of recipients and servers. Each recipient will
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receive all of the alert for the listed location (the list is a regex).
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```event_location_tag``` must contain a valid chef tag. All the nodes listed by
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that tag will generate a separate ```email_alerts``` rule.
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This is additional to the default list ```email_to``` and is used to send alert to
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specific recipients for a limited number of hosts only.
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# Local Rules Definitions
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Rules are defined in Ruby Hash format and replicate the XML format of regular
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[OSSEC Rules Syntax](http://www.ossec.net/doc/syntax/head_rules.html)
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Each rule has a head, a body, tags and info (the last 2 being optional)
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head= <rule id="12345" level="12" frequency="45" timeframe="60">
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body= <description>Test Rule</description>
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body= <match>Big Error</match>
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body= <hostname>server1</hostname>
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tags= <same_source_ip />
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tags= <same_source_port />
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info= <info type="link">http://IjustGotHacked.com</info>
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</rule>
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The section below are parsed by the template. The following items are mandatory:
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* head/level
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* body/description
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```
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"ossec" =>
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"rules" => {
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"100001" => {
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"head" => {
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"level" => "7",
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"maxsize" => "65536",
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"frequency" => "100",
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"timeframe" => "3600",
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"ignore" => "5",
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"overwrite" => "68321"
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},
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"body" => {
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"hostname_search" => "recipes:mms-agent",
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"description" => "Super Security Rule for application XYZ",
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"match" => "super dangerous error happened",
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"regex" => "^\d+Hello World$",
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"decoded_as" => "vsftpd",
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"category" => "windows",
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"srcip" => "192.168.1.254",
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"dstip" => "10.1.6.23",
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"user" => "bob",
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"program_name" => "nginx",
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"time" => "09:00-18:00",
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"weekday" => "monday,tuesday",
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"id" => "404",
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"url" => "/changepassword.php",
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"if_sid" => "100238",
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"if_group" => "authentication_success",
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"if_level" => "13",
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"if_matched_sid" => "12037",
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"if_matched_group" => "adduser",
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"if_matched_level" => "7",
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"options" => "no_email_alert",
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"check_diff" => "true",
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"group" => "syscheck"
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},
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"tags" => [
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"same_source_ip",
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"same_source_port",
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"same_dst_port",
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"same_location"
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],
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"infos" => {
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"link" => "http://trac.example.net/ticket/12345",
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"text" => "the link above contains additional information"
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}
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}
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}
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```
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## hostname_search
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To the exception of __hostname_search__, all attributes use the same syntax as the
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ossec rule in XML format does.
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__hostname_search__ in this cookbook represents a search query that is executed by
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the server recipe to populate the ```<hostname>``` with the proper list of hosts,
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dynamically pulled from chef. Search criterias can be anything that a chef search
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can take. Example: ```recipe:mongodb\:\:replicaset and tags:reputation```
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# Local Decoders Definitions
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Decoders are defined in JSON format and replicate the XML format of regular
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[OSSEC Decoder Syntax](http://www.ossec.net/doc/syntax/head_decoders.html)
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"ossec" => {
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"decoders" => {
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'apache-errorlog' => {
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"program_name" => '^httpd|^apache2',
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"prematch" => {
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"parser" => '^\S+ [\w+\s*\d+ \S+ \d+] [\S+] |^[warn] |^[notice] |^[error]'
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},
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},
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'apache-errorlog-ip-custom' => {
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"parent" => 'apache-errorlog',
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"prematch" => {
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"offset" => 'after_parent',
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"parser" => '^[client'
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},
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"regex" => {
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"offset" => 'after_prematch',
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"parser" => '^ (\d+.\d+.\d+.\d+)]'
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},
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"order" => 'srcip'
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},
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'web-accesslog-custom' => {
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"parent" => 'web-accesslog',
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"type" => 'web-log',
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"prematch" => {
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"parser" => '^\d+.\d+.\d+.\d+ |^::ffff:\d+.\d+.\d+.\d+'
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},
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"regex" => {
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"parser" => '^\d+.\d+.\d+.\d+ \S+ (\d+.\d+.\d+.\d+) \S+ \S+ \S+ [\S+ \S\d+] "\w+ (\S+) HTTP\S+ (\d+) \S+ "(\S+)"'
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},
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"order" => 'srcip, url, id, extra_data'
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}
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}
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}
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```prematch``` and ```regex``` are hashes that can have an ```offset``` value and
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always have a ```parser``` value. See the ossec documentation for more information.
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# Local Syslog Files and Syscheck Ignore Files
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If you want specific log files to be monitored on specific agents, you can use
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a `syslog_files` block in the agent node attributes. The `apply_to`
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parameter of this block is a `Chef::Search()` that will expand to a list of
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hosts. If the given agent belong to the list of hosts, it will add the logfile
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to its local ossec configuration. log_format will default to "syslog" if not set.
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If you want to ignore specific files in syscheck, similarly you can use the same
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`apply_to` option as shown below:
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```
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default_attributes(
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"ossec" => {
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"syslog_files" => {
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'/var/log/supervisor/supervisor.log' => {
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'apply_to' => 'supervisor:*',
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'log_format' => 'syslog'
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}
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},
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"syscheck" => {
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"ignore" => {
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'/etc/openvpn/openvpn-status.log' => {
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'apply_to' => 'roles:vpn-server'
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},
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'^/opt/graphite/storage/' => {
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'apply_to' => 'roles:graphite-server OR roles:statsd-server',
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'type' => 'sregex'
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}
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}
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}
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}
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)
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```
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# OSSEC Rules Enable/Disable
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You can also choose what rules OSSEC it configured to load. Each of the rules in
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/var/ossec/rules can be enabled and disabled at will with a very simple format.
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Note that these do not have an apply_to option and are just boolean values, this
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is because only the OSSEC server loads the rules into action. The following is
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an example that will enable the normally disabled `symantec-av-rules.xml` and
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disable the `web_rules.xml`:
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```
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default_attributes(
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"ossec" => {
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"load_rules" => {
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'symantec-av_rules.xml' => true,
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'web_rules.xml' => false
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}
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}
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)
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```
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# Commands and Auto-Response
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Since OSSEC is an HIDS system, you can also enable and disable commands and
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active-response functionality and define your own as needed. You can enable
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or disable existing defined commands and active-responses using the
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`enable` flag, and target where they are set using the `apply_to` flag. You
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can also define any of the allowed active-response options dynamically, such
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as adding agent_id, rules_group, etc.
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Here is an example of enabling the firewall-stop command and its auto-response
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and changing it from the default local to all hosts and adding a `rules_group`
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to the active-response definition so it only triggers on authentication
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failures:
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```
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default_attributes(
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"ossec" => {
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"command" => {
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"firewall-stop" => {
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"enabled" => true
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}
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},
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"auto-response => {
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"firewall-stop" => {
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"enabled" => true,
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"location" => "all",
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"rules_group" => "authentication_failed,authentication_failures"
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}
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}
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}
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)
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```
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Usage
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=====
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* `recipe[ossec-server]` should be a stand alone installation
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* `recipe[ossec-agent]` should be added (via role[ossec-agent]) to all the nodes of the
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environment
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# Example Roles
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## ossec-server
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This role can be used to provision an ossec server:
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```ruby
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name 'ossec-server'
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description 'OSSEC Server'
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run_list(
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'recipe[ossec-ng::server]',
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'role[postfix]'
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)
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override_attributes(
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"ossec" => {
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"agent" => {
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"enable" => false
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}
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}
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)
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default_attributes(
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"ossec" => {
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"email_notification" => 'yes',
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"email_to" => [
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'ossec-alerts@example.net',
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],
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"email_from" => 'ossec-server',
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"smtp_server" => 'localhost',
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"white_list" => [
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'127.0.0.1',
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'10.0.0.0/0'
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],
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"email_alerts" => {
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'bob@example.net' => {
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'event_location_tag' => 'project1',
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},
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'alice@example.net' => {
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'event_location_tag' => 'project1',
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'group' => 'developers',
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},
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'eve@example.net' => {
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'event_location_tag' => 'project2',
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'group' => 'developers',
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},
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'mike@example.net' => {
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'event_location_search' => 'tags:project1 OR tags:project2 OR tags:project3',
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'group' => 'developers',
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},
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'group2@example.net' => {
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'event_location_search' => 'roles:application-server AND roles:python-django',
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'group' => 'frontend-group',
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},
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},
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"decoders" => {
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1 => {
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"name" => 'apache-errorlog',
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"program_name" => '^httpd|^apache2',
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"prematch" => {
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"parser" => '^\S+ [\w+\s*\d+ \S+ \d+] [\S+] |^[warn] |^[notice] |^[error]'
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},
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},
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2 => {
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"name" => 'apache-errorlog-ip-custom',
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"parent" => 'apache-errorlog',
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"prematch" => {
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"offset" => 'after_parent',
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"parser" => '^[client'
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},
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"regex" => {
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"offset" => 'after_prematch',
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"parser" => '^ (\d+.\d+.\d+.\d+)]'
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},
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"order" => 'srcip'
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},
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3 => {
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"name" => 'web-accesslog-custom',
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"parent" => 'web-accesslog',
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"type" => 'web-log',
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"prematch" => {
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"parser" => '^\d+.\d+.\d+.\d+ |^::ffff:\d+.\d+.\d+.\d+'
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},
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"regex" => {
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"parser" => '^\d+.\d+.\d+.\d+ \S+ (\d+.\d+.\d+.\d+) \S+ \S+ \S+ [\S+ \S\d+] "\w+ (\S+) HTTP\S+ (\d+) \S+ "(\S+)"'
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},
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"order" => 'srcip, url, id, extra_data'
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}
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},
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"rules" => {
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1002 => {
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"head" => {
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"level" => '2',
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"overwrite" => 'yes'
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},
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"body" => {
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"description" => 'Unknown problem somewhere in the system.',
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"match" => 'core_dumped|failure|error|Error|attack|bad |illegal |denied|refused|unauthorized|fatal|fail|Segmentation Fault|Corrupted|Traceback|raise',
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"options" => 'alert_by_email'
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}
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},
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1003 => {
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"head" => {
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"level" => '6',
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"maxsize" => '16384',
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"overwrite" => 'yes'
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},
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"body" => {
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"description" => 'Non standard syslog message (larger than 16kB).'
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}
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},
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100003 => {
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"head" => {
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"level" => '10'
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},
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"body" => {
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"description" => 'Successful sudo during non-business hours 6pm to 8am',
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"if_sid" => '5402,5403',
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"time" => '10pm - 12am'
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}
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},
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100004 => {
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"head" => {
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"level" => '10'
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},
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"body" => {
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"description" => 'Successful sudo during weekend.',
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"if_sid" => '5402,5403',
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"weekday" => 'weekends'
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}
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},
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100005 => {
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"head" => {
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"level" => '0'
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},
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"body" => {
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"description" => 'Silencing sudo errors from accounts allowed to sudo anytime',
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"if_sid" => '100004,100005',
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"match" => 'nagios'
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}
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},
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100006 => {
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"head" => {
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"level" => '0'
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},
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"body" => {
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"description" => 'Silencing ossec agent stop/start during business hours 8am to 6pm',
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"if_sid" => '502,503,504',
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"time" => '12:00-22:00',
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"weekday" => 'monday,tuesday,wednesday,thursday,friday'
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}
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},
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100007 => {
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"head" => {
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"level" => '8'
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},
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"body" => {
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"description" => 'Login outside of business hours 6pm to 8am',
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"if_sid" => '5501',
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"time" => '22:00-12:00'
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}
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},
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100008 => {
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"head" => {
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"level" => '8'
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},
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"body" => {
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"description" => 'Login during weekend.',
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"if_sid" => '5501',
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"weekday" => 'weekends'
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}
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},
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100009 => {
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"head" => {
|
|
"level" => '0'
|
|
},
|
|
"body" => {
|
|
"description" => 'Ignore logins alerts for systems accounts',
|
|
"if_sid" => '100007,100008',
|
|
"match" => 'ubuntu|nagios'
|
|
}
|
|
}
|
|
}
|
|
}
|
|
)
|
|
```
|
|
|
|
## ossec-agent
|
|
This role can be used to provision an ossec-agent
|
|
|
|
```ruby
|
|
name "ossec-agent"
|
|
description "OSSEC Agent"
|
|
run_list(
|
|
"recipe[ossec-ng::agent]"
|
|
)
|
|
default_attributes(
|
|
"ossec" => {
|
|
"client" => {
|
|
"service_name" => 'ossec-hids-client'
|
|
},
|
|
"syscheck" => {
|
|
"frequency" => '7200',
|
|
"alert_new_files" => 'yes',
|
|
"auto_ignore" => 'no',
|
|
"directories" => {
|
|
'/bin' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'yes'
|
|
},
|
|
'/boot' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'no'
|
|
},
|
|
'/etc' => {
|
|
'report_changes' => 'yes',
|
|
'realtime' => 'no'
|
|
},
|
|
'/lib/lsb' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'yes'
|
|
},
|
|
'/lib/modules' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'yes'
|
|
},
|
|
'/lib/plymouth' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'yes'
|
|
},
|
|
'/lib/security' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'yes'
|
|
},
|
|
'/lib/terminfo' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'yes'
|
|
},
|
|
'/lib/ufw' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'yes'
|
|
},
|
|
'/lib/xtables' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'no'
|
|
},
|
|
'/media' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'no'
|
|
},
|
|
'/opt' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'no'
|
|
},
|
|
'/root' => {
|
|
'report_changes' => 'yes',
|
|
'realtime' => 'no'
|
|
},
|
|
'/srv' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'no'
|
|
},
|
|
'/sbin' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'yes'
|
|
},
|
|
'/usr/' => {
|
|
'report_changes' => 'yes',
|
|
'realtime' => 'yes'
|
|
},
|
|
'/tmp' => {
|
|
'report_changes' => 'no',
|
|
'realtime' => 'no'
|
|
}
|
|
},
|
|
"ignore" => {
|
|
'/etc/openvpn/openvpn-status.log' => {}
|
|
'/etc/motd' => {},
|
|
'/etc/blkid.tab' => {},
|
|
'/etc/mtab' => {},
|
|
'/etc/mail/statistics' => {},
|
|
'/etc/random-seed' => {},
|
|
'/etc/adjtime' => {},
|
|
'/etc/prelink.cache' => {},
|
|
'/root/.bash_history' => {}
|
|
'^/opt/graphite/storage/' => {
|
|
'apply_to' => 'roles:graphite-server OR roles:statsd-server',
|
|
'type' => 'sregex'
|
|
},
|
|
'^/usr/lib/elasticsearch' => {
|
|
'apply_to' => 'roles:elastic-search-cluster',
|
|
'type' => 'sregex'
|
|
},
|
|
'^/etc/chef/cache/checksums/' => {
|
|
'apply_to' => 'roles:chef-client',
|
|
'type' => 'sregex'
|
|
},
|
|
'^/srv/rsyslog/' => {
|
|
'apply_to' => 'roles:rsyslog-server',
|
|
'type' => 'sregex'
|
|
},
|
|
'^/etc/djbdns/public-dnscache/supervise/|^/etc/djbdns/tinydns-internal/supervise/|^/etc/djbdns/public-dnscache/log|^/etc/djbdns/tinydns-internal/log|^/etc/djbdns/tinydns-internal/root/data' => {
|
|
'apply_to' => 'roles:djbdns-server',
|
|
'type' => 'sregex'
|
|
}
|
|
}
|
|
},
|
|
"syslog_files" => {
|
|
'/var/log/syslog' => {},
|
|
'/var/log/auth.log' => {},
|
|
'/var/log/daemon.log' => {},
|
|
'/var/log/kern.log' => {},
|
|
'/var/log/mail.log' => {},
|
|
'/var/log/user.log' => {},
|
|
'/var/log/cron.log' => {},
|
|
'/var/log/chef/client.log' => {},
|
|
'/var/log/supervisor/supervisor.log' => {
|
|
'apply_to' => 'supervisor:*',
|
|
'log_format' => 'syslog'
|
|
},
|
|
'/var/log/rabbitmq/rabbit1.log' => {
|
|
'apply_to' => 'recipes:rabbitmq',
|
|
'log_format' => 'multi-line:3'
|
|
},
|
|
'/var/log/nginx/access.log' => {
|
|
'apply_to' => 'nginx:*',
|
|
'log_format' => 'syslog'
|
|
},
|
|
'/var/log/nginx/error.log' => {
|
|
'apply_to' => 'nginx:*',
|
|
'log_format' => 'syslog'
|
|
},
|
|
'/var/log/nagios3/nagios.log' => {
|
|
'apply_to' => 'roles:nagios-server',
|
|
'log_format' => 'syslog'
|
|
},
|
|
'/var/log/nagios3/apache_access.log' => {
|
|
'apply_to' => 'roles:nagios-server',
|
|
'log_format' => 'syslog'
|
|
},
|
|
'/var/log/nagios3/apache_error.log' => {
|
|
'apply_to' => 'roles:nagios-server',
|
|
'log_format' => 'syslog'
|
|
}
|
|
}
|
|
}
|
|
)
|
|
```
|
|
|
|
Author
|
|
======
|
|
Eric Renfro - psi-jack@linux-help.org - https://linux-help.org
|
|
|
|
Derived from works from:
|
|
Julien Vehent - julien@linuxwall.info - http://jve.linuxwall.info
|
|
|