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audit_syslog - realtime conversion of Solaris audit data to syslog messages

/usr/lib/security/audit_syslog.so

The audit_syslog plugin module for Solaris audit, /usr/lib/security/audit_syslog.so, provides realtime conversion of Solaris audit data to syslog-formatted (text) data and sends it to a syslog daemon as configured in syslog.conf(4). The plugin's path is specified in the audit configuration file, audit_control(4).

Messages to syslog are written if selected via the plugin option in audit_control. Syslog messages are generated with the facility code of LOG_AUDIT (audit in syslog.conf(4)) and severity of LOG_NOTICE. Audit syslog messages contain data selected from the tokens described for the binary audit log. (See audit.log(4)). As with all syslog messages, each line in a syslog file consists of two parts, a syslog header and a message.

The syslog header contains the date and time the message was generated, the host name from which it was sent, auditd to indicate that it was generated by the audit daemon, an ID field used internally by syslogd, and audit.notice indicating the syslog facility and severity values. The syslog header ends with the characters ], that is, a closing square bracket and a space.

The message part starts with the event type from the header token. All subsequent data appears only if contained in the original audit record and there is room in the 1024-byte maximum length syslog line. In the following example, the backslash (\e) indicates a continuation; actual syslog messages are contained on one line:

Oct 31 11:38:08 smothers auditd: [ID 917521 audit.notice] chdir(2) ok\e
session 401 by joeuser as root:other from myultra obj /export/home

In the preceding example, chdir(2) is the event type. Following this field is additional data, described below. This data is omitted if it is not contained in the source audit record. ok or failed

session <#> by <name> as <name>:<group> in <zone name> from <terminal> obj <path> proc_uid <owner> proc_auid <owner>

The following are example syslog messages:

Nov 4 8:27:07 smothers auditd: [ID 175219 audit.notice] \e
system booted

Nov 4 9:28:17 smothers auditd: [ID 752191 audit.notice] \e
login - rlogin ok session 401 by joeuser as joeuser:staff from myultra

Nov 4 10:29:27 smothers auditd: [ID 521917 audit.notice] \e
access(2) ok session 255 by janeuser as janeuser:staff from \e
129.146.89.30 obj /etc/passwd

The p_flag attribute, specified by means of the plugin directive (see audit_control(4)), is used to further filter audit data being sent to the syslog daemon beyond the classes specified through the flags and naflags lines of audit_control and through the user-specific lines of audit_user(4). The parameter is a comma-separated list; each item represents an audit class (see audit_class(4)) and is specified using the same syntax used in audit_control for the flags and naflags lines. The default (no p_flags listed) is that no audit records are generated.

Example 1 One Use of the plugin Line

In the specification shown below, the plugin line (in conjunction with flags and naflags) is used to allow class records for lo but allows class records for am for failures only. Omission of the fm class records results in no fm class records being output. The pc parameter has no effect because you cannot add classes to those defined by means of flags and naflags and by audit_user(4). You can only remove them.

flags: lo,am,fm
naflags: lo
plugin: name=audit_syslog.so; p_flags=lo,-am

Example 2 Use of all

In the specification shown below, with one exception, all allows all flags defined by means of flags and naflags (and audit_user(4)). The exception the am metaclass, which is equivalent to ss,as,ua, which is modified to output all ua events but only failure events for ss and as.

flags: lo,am
naflags: lo
plugin: name=audit_syslog.so; p_flags=all,^+ss,^+as

See attributes(5) for a description of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

MT Level MT-Safe

Interface Stability See below.

The message format and message content are Uncommitted. The configuration parameters are Committed.

auditd(1M), audit_class(4), audit_control(4), syslog.conf(4), attributes(5)

System Administration Guide: Security Services

Use of the plugin configuration line to include audit_syslog.so requires that /etc/syslog.conf is configured to store syslog messages of facility audit and severity notice or above in a file intended for Solaris audit records. An example of such a line in syslog.conf is:

audit.notice /var/audit/audit.log

Messages from syslog are sent to remote syslog servers by means of UDP, which does not guarantee delivery or ensure the correct order of arrival of messages.

If the parameters specified for the plugin line result in no classes being preselected, an error is reported by means of a syslog alert with the LOG_DAEMON facility code.

The time field in the syslog header is generated by syslog(3C) and only approximates the time given in the binary audit log. Normally the time field shows the same whole second or at most a few seconds difference.