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syslog-ng Open Source Edition 3.25 - Administration Guide

Preface Introduction to syslog-ng The concepts of syslog-ng Installing syslog-ng The syslog-ng OSE quick-start guide The syslog-ng OSE configuration file source: Read, receive, and collect log messages
How sources work default-network-drivers: Receive and parse common syslog messages internal: Collecting internal messages file: Collecting messages from text files wildcard-file: Collecting messages from multiple text files linux-audit: Collecting messages from Linux audit logs network: Collecting messages using the RFC3164 protocol (network() driver) nodejs: Receiving JSON messages from nodejs applications mbox: Converting local email messages to log messages osquery: Collect and parse osquery result logs pipe: Collecting messages from named pipes pacct: Collecting process accounting logs on Linux program: Receiving messages from external applications python: writing server-style Python sources python-fetcher: writing fetcher-style Python sources snmptrap: Read Net-SNMP traps sun-streams: Collecting messages on Sun Solaris syslog: Collecting messages using the IETF syslog protocol (syslog() driver) system: Collecting the system-specific log messages of a platform systemd-journal: Collecting messages from the systemd-journal system log storage systemd-syslog: Collecting systemd messages using a socket tcp, tcp6, udp, udp6: Collecting messages from remote hosts using the BSD syslog protocol— OBSOLETE unix-stream, unix-dgram: Collecting messages from UNIX domain sockets stdin: Collecting messages from the standard input stream
destination: Forward, send, and store log messages
amqp: Publishing messages using AMQP collectd: sending metrics to collectd elasticsearch2: Sending messages directly to Elasticsearch version 2.0 or higher (DEPRECATED) elasticsearch-http: Sending messages to Elasticsearch HTTP Bulk API file: Storing messages in plain-text files graphite: Sending metrics to Graphite Sending logs to Graylog hdfs: Storing messages on the Hadoop Distributed File System (HDFS) Posting messages over HTTP http: Posting messages over HTTP without Java kafka: Publishing messages to Apache Kafka (Java implementation) kafka: Publishing messages to Apache Kafka (C implementation, using the librdkafka client) loggly: Using Loggly logmatic: Using Logmatic.io mongodb: Storing messages in a MongoDB database network: Sending messages to a remote log server using the RFC3164 protocol (network() driver) osquery: Sending log messages to osquery's syslog table pipe: Sending messages to named pipes program: Sending messages to external applications pseudofile() python: writing custom Python destinations redis: Storing name-value pairs in Redis riemann: Monitoring your data with Riemann slack: Sending alerts and notifications to a Slack channel smtp: Generating SMTP messages (email) from logs snmp: Sending SNMP traps Splunk: Sending log messages to Splunk sql: Storing messages in an SQL database stomp: Publishing messages using STOMP syslog: Sending messages to a remote logserver using the IETF-syslog protocol syslog-ng(): Forward logs to another syslog-ng node tcp, tcp6, udp, udp6: Sending messages to a remote log server using the legacy BSD-syslog protocol (tcp(), udp() drivers) Telegram: Sending messages to Telegram unix-stream, unix-dgram: Sending messages to UNIX domain sockets usertty: Sending messages to a user terminal: usertty() destination Write your own custom destination in Java or Python Client-side failover
log: Filter and route log messages using log paths, flags, and filters Global options of syslog-ng OSE TLS-encrypted message transfer template and rewrite: Format, modify, and manipulate log messages parser: Parse and segment structured messages db-parser: Process message content with a pattern database (patterndb) Correlating log messages Enriching log messages with external data Statistics of syslog-ng Multithreading and scaling in syslog-ng OSE Troubleshooting syslog-ng Best practices and examples The syslog-ng manual pages Creative Commons Attribution Non-commercial No Derivatives (by-nc-nd) License Glossary

Element: values

Location

/patterndb/ruleset/rules/rule/patterns/values

Description

OPTIONAL — Name-value pairs that are assigned to messages matching the patterns, for example, the representation of the event in the message according to the Common Event Format (CEF) or Common Event Exchange (CEE). The names can be used as macros to reference the assigned values.

Attributes

N/A

Children

  • value: OPTIONAL — Contains the value of the name-value pair that is assigned to the message.

    The <value> element of name-value pairs can include template functions. For details, see Using template functions, for examples, see if.

    When used together with message correlation, the <value> element of name-value pairs can include references to the values of earlier messages from the same context. For details, see Correlating log messages using pattern databases.

  • name: The name of the name-value pair. It can also be used as a macro to reference the assigned value.

Example
<values>
    <value name=".classifier.outcome">/Success</value>
</values>

Element: examples

Location

/patterndb/ruleset/rules/rule/patterns/examples

Description

OPTIONAL — A container element for sample log messages that should be recognized by the pattern. These messages can be used also to test the patterns and the parsers.

Attributes

N/A

Children
Example
<examples>
    <example>
        <test_message>Accepted password for sampleuser from 10.50.0.247 port 42156 ssh2</test_message>
        <test_values>
            <test_value name="SSH.AUTH_METHOD">password</test_value>
            <test_value name="SSH_USERNAME">sampleuser</test_value>
            <test_value name="SSH_CLIENT_ADDRESS">10.50.0.247</test_value>
            <test_value name="SSH_PORT_NUMBER">42156</test_value>
        </test_values>
    </example>
</examples>

Element: example

Location

/patterndb/ruleset/rules/rule/patterns/examples/example

Description

OPTIONAL — A container element for a sample log message.

Attributes

N/A

Children

  • test_message: OPTIONAL — A sample log message that should match this pattern. For example:

    <test_message program="myapplication">Content filter has been enabled</test_message>

    • program: The program pattern of the test message. For example:

      <test_message program="proftpd">ubuntu (::ffff:192.168.2.179[::ffff:192.168.2.179]) - FTP session closed.</test_message>

  • test_values: OPTIONAL — A container element to test the results of the parsers used in the pattern.

    • test_value: OPTIONAL — The expected value of the parser when matching the pattern to the test message. For example:

      <test_value name=".dict.ContentFilter">enabled</test_value>

      • name: The name of the parser to test.

Example
<examples>
    <example>
        <test_message>Accepted password for sampleuser from 10.50.0.247 port 42156 ssh2</test_message>
        <test_values>
            <test_value name="SSH.AUTH_METHOD">password</test_value>
            <test_value name="SSH_USERNAME">sampleuser</test_value>
            <test_value name="SSH_CLIENT_ADDRESS">10.50.0.247</test_value>
            <test_value name="SSH_PORT_NUMBER">42156</test_value>
        </test_values>
    </example>
</examples>

Element: actions

Location

/patterndb/ruleset/actions

Description

OPTIONAL — A container element for actions that are performed if a message is recognized by the pattern. For details on actions, see Triggering actions for identified messages.

Attributes

N/A

Children
Example
Example: Generating messages for pattern database matches

When inserted in a pattern database rule, the following example generates a message when a message matching the rule is received.

<actions>
    <action>
        <message>
            <values>
                <value name="MESSAGE">A log message from ${HOST} matched rule number $.classifier.rule_id</value>
            </values>
        </message>
    </action>
</actions>

To inherit the properties and values of the triggering message, set the inherit-properties attribute of the <message> element to TRUE. That way the triggering log message is cloned, including name-value pairs and tags. If you set any values for the message in the <action> element, they will override the values of the original message.

Example: Generating messages with inherited values

The following action generates a message that is identical to the original message, but its $PROGRAM field is set to overriding-original-program-name

<actions>
    <action>
        <message inherit-properties='TRUE'>
            <values>
                <value name="PROGRAM">overriding-original-program-name</value>
            </values>
        </message>
    </action>
</actions>
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