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syslog-ng Open Source Edition 3.22 - 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 e-mail 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 (e-mail) 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: Forwarding messages and tags 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

mbox: Converting local e-mail messages to log messages

Using the mbox() driver, syslog-ng OSE can read e-mail messages from local mbox files, and convert them to multiline log messages.

This driver has only one required option, the filename of the mbox file. To use the mbox() driver, the scl.conf file must be included in your syslog-ng OSE configuration:

@include "scl.conf"

The mbox() driver is actually a reusable configuration snippet configured to read log messages using the file() driver. For details on using or writing such configuration snippets, see Reusing configuration blocks. You can find the source of the configuration snippet on GitHub.

Example: Using the mbox() driver

The following example reads the e-mails of the root user on the syslog-ng OSE host.

@include "scl.conf"
source root-mbox {
    mbox("/var/spool/mail/root");
};

mbox() source options

The mbox() driver has the following option.

hook-commands()

Description: This option makes it possible to execute external programs when the relevant driver is initialized or torn down. The hook-commands() can be used with all source and destination drivers with the exception of the usertty() and internal() drivers.

NOTE: The syslog-ng OSE application must be able to start and restart the external program, and have the necessary permissions to do so. For example, if your host is running AppArmor or SELinux, you might have to modify your AppArmor or SELinux configuration to enable syslog-ng OSE to execute external applications.

Using the hook-commands() when syslog-ng OSE starts or stops

To execute an external program when syslog-ng OSE starts or stops, use the following options:

startup()
Type: string
Default: N/A

Description: Defines the external program that is executed as syslog-ng OSE starts.

shutdown()
Type: string
Default: N/A

Description: Defines the external program that is executed as syslog-ng OSE stops.

Using the hook-commands() when syslog-ng OSE reloads

To execute an external program when the syslog-ng OSE configuration is initiated or torn down, for example, on startup/shutdown or during a syslog-ng OSE reload, use the following options:

setup()
Type: string
Default: N/A

Description: Defines an external program that is executed when the syslog-ng OSE configuration is initiated, for example, on startup or during a syslog-ng OSE reload.

teardown()
Type: string
Default: N/A

Description: Defines an external program that is executed when the syslog-ng OSE configuration is stopped or torn down, for example, on shutdown or during a syslog-ng OSE reload.

Example: Using the hook-commands() with a network source

In the following example, the hook-commands() is used with the network() driver and it opens an iptables port automatically as syslog-ng OSE is started/stopped.

The assumption in this example is that the LOGCHAIN chain is part of a larger ruleset that routes traffic to it. Whenever the syslog-ng OSE created rule is there, packets can flow, otherwise the port is closed.

source {
   network(transport(udp)
	hook-commands(
          startup("iptables -I LOGCHAIN 1 -p udp --dport 514 -j ACCEPT")
          shutdown("iptables -D LOGCHAIN 1")
        )
     );
};

osquery: Collect and parse osquery result logs

The osquery application allows you to ask questions about your machine using an SQL-like language. For example, you can query running processes, logged in users, installed packages and syslog messages as well. You can make queries on demand, and also schedule them to run regularly.

The osquery() source of syslog-ng OSE allows you read the results of periodical osquery queries (from the /var/log/osquery/osqueryd.results.log file) and automatically parse the messages (if you want to use syslog-ng OSE to send log messages to osquery, read this blogpost). For example, you can:

  • Create filters from the fields of the messages.

  • Limit which fields to store, or create additional fields (combine multiple fields into one field, and so on).

  • Send the messages to a central location, for example, to Elasticsearch, directly from syslog-ng OSE.

The syslog-ng OSE application automatically adds the .osquery. prefix to the name of the fields the extracted from the message.

The osquery() source is available in syslog-ng OSE version 3.10 and later.

Prerequisites:
  • To use the osquery() driver, the scl.conf file must be included in your syslog-ng OSE configuration:

    @include "scl.conf"
  • syslog-ng OSE must be compiled with JSON-support enabled.

The osquery() driver is actually a reusable configuration snippet configured to read the osquery log file using the file() driver, and process its JSON contents. For details on using or writing such configuration snippets, see Reusing configuration blocks. You can find the source of this configuration snippet on GitHub.

Example: Using the osquery() driver with the default settings

The following syslog-ng OSE configuration sample uses the default settings of the driver, reading osquery result logs from the /var/log/osquery/osqueryd.results.log file, and writes the log messages generated from the traps into a file.

@version: 3.10
@include "scl.conf"
source s_osquery {
    osquery();
};
log {
    source(s_osquery);
    destination {
        file("/var/log/example.log");
    };
};

Filter for messages related to loading Linux kernel modules:

@version: 3.10
@include "scl.conf"
source s_osquery {
    osquery();
};
log {
    source(s_osquery);
    filter f_modules {
        "${.osquery.name}" eq "pack_incident-response_kernel_modules"
    };
    destination {
        file("/var/log/example.log");
    };
};
Example: Using the osquery() driver with custom configuration

The following syslog-ng OSE configuration sample reads osquery result logs from the /tmp/osquery_input.log file, and writes the log messages generated from the traps into a file. Using the format-json template, the outgoing message will be a well-formed JSON message.

Input message:
{"name":"pack_osquery-monitoring_osquery_info","hostIdentifier":"testhost","calendarTime":"Fri Jul 21 10:04:41 2017 UTC","unixTime":"1500631481","decorations":{"host_uuid":"4C4C4544-004D-3610-8043-C2C04F4D3332","username":"myuser"},"columns":{"build_distro":"xenial","build_platform":"ubuntu","config_hash":"43cd1c6a7d0c283e21e026a53e619b2e582e94ee","config_valid":"1","counter":"4","extensions":"active","instance_id":"d0c3eb0d-f8e0-4bea-868b-18a2c61b438d","pid":"19764","resident_size":"26416000","start_time":"1500629552","system_time":"223","user_time":"476","uuid":"4C4C4544-004D-3610-8043-C2C04F4D3332","version":"2.5.0","watcher":"19762"},"action":"added"}
syslog-ng OSE configuration:
@version: 3.10
@include "scl.conf"
source s_osquery {
    osquery(
      file(/tmp/osquery_input.log)
      prefix(.osquery.)
    );
};
destination d_file {
    file(
      "/tmp/output.txt"
      template("$(format_json --key .osquery.*)\n")
    );
};
log {
  source(s_osquery);
  destination(d_file);
  flags(flow-control);
};
Outgoing message:
Outgoing message; message='{"_osquery":{"unixTime":"1500631481","name":"pack_osquery-monitoring_osquery_info","hostIdentifier":"testhost","decorations":{"username":"myuser","host_uuid":"4C4C4544-004D-3610-8043-C2C04F4D3332"},"columns":{"watcher":"19762","version":"2.5.0","uuid":"4C4C4544-004D-3610-8043-C2C04F4D3332","user_time":"476","system_time":"223","start_time":"1500629552","resident_size":"26416000","pid":"19764","instance_id":"d0c3eb0d-f8e0-4bea-868b-18a2c61b438d","extensions":"active","counter":"4","config_valid":"1","config_hash":"43cd1c6a7d0c283e21e026a53e619b2e582e94ee","build_platform":"ubuntu","build_distro":"xenial"},"calendarTime":"Fri Jul 21 10:04:41 2017 UTC","action":"added"}}\x0a'

To configure a destination to send the log messages to Elasticsearch, see elasticsearch2: Sending messages directly to Elasticsearch version 2.0 or higher (DEPRECATED). For other destinations, see destination: Forward, send, and store log messages.

osquery() source options

The osquery() driver has the following options.

file()
Type: path
Default: /var/log/osquery/osqueryd.results.log

Description: The log file of osquery that stores the results of periodic queries. The syslog-ng OSE application reads the messages from this file.

hook-commands()

Description: This option makes it possible to execute external programs when the relevant driver is initialized or torn down. The hook-commands() can be used with all source and destination drivers with the exception of the usertty() and internal() drivers.

NOTE: The syslog-ng OSE application must be able to start and restart the external program, and have the necessary permissions to do so. For example, if your host is running AppArmor or SELinux, you might have to modify your AppArmor or SELinux configuration to enable syslog-ng OSE to execute external applications.

Using the hook-commands() when syslog-ng OSE starts or stops

To execute an external program when syslog-ng OSE starts or stops, use the following options:

startup()
Type: string
Default: N/A

Description: Defines the external program that is executed as syslog-ng OSE starts.

shutdown()
Type: string
Default: N/A

Description: Defines the external program that is executed as syslog-ng OSE stops.

Using the hook-commands() when syslog-ng OSE reloads

To execute an external program when the syslog-ng OSE configuration is initiated or torn down, for example, on startup/shutdown or during a syslog-ng OSE reload, use the following options:

setup()
Type: string
Default: N/A

Description: Defines an external program that is executed when the syslog-ng OSE configuration is initiated, for example, on startup or during a syslog-ng OSE reload.

teardown()
Type: string
Default: N/A

Description: Defines an external program that is executed when the syslog-ng OSE configuration is stopped or torn down, for example, on shutdown or during a syslog-ng OSE reload.

Example: Using the hook-commands() with a network source

In the following example, the hook-commands() is used with the network() driver and it opens an iptables port automatically as syslog-ng OSE is started/stopped.

The assumption in this example is that the LOGCHAIN chain is part of a larger ruleset that routes traffic to it. Whenever the syslog-ng OSE created rule is there, packets can flow, otherwise the port is closed.

source {
   network(transport(udp)
	hook-commands(
          startup("iptables -I LOGCHAIN 1 -p udp --dport 514 -j ACCEPT")
          shutdown("iptables -D LOGCHAIN 1")
        )
     );
};
prefix()
Synopsis: prefix()

Description: Insert a prefix before the name part of the parsed name-value pairs to help further processing. For example:

  • To insert the my-parsed-data. prefix, use the prefix(my-parsed-data.) option.

  • To refer to a particular data that has a prefix, use the prefix in the name of the macro, for example, ${my-parsed-data.name}.

  • If you forward the parsed messages using the IETF-syslog protocol, you can insert all the parsed data into the SDATA part of the message using the prefix(.SDATA.my-parsed-data.) option.

Names starting with a dot (for example, .example) are reserved for use by syslog-ng OSE. If you use such a macro name as the name of a parsed value, it will attempt to replace the original value of the macro (note that only soft macros can be overwritten, see Hard vs. soft macros for details). To avoid such problems, use a prefix when naming the parsed values, for example, prefix(my-parsed-data.)

Default value:

.osquery. option.

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