AUDIT_CLASS(5) File Formats and Configurations AUDIT_CLASS(5)

NAME

audit_class - audit class definitions

SYNOPSIS

/etc/security/audit_class

DESCRIPTION

/etc/security/audit_class is a user-configurable ASCII system file that
stores class definitions used in the audit system. Audit events in
audit_event(5) are mapped to one or more of the defined audit classes.
audit_event can be updated in conjunction with changes to audit_class.
Programs can use the getauclassent(3BSM) routines to access audit class
information.


The fields for each class entry are separated by colons. Each class entry
is a bitmap and is separated from each other by a newline.


Each entry in the audit_class file has the form:

mask:name:description


The fields are defined as follows:

mask
class mask


name
class name


description
class description


Each class is represented as a bit in the class mask which is an unsigned
integer. Thus, there are 32 different classes available. Meta-classes can
also be defined. These are supersets composed of multiple base classes,
and thus will have more than 1 bit in its mask. See Examples. Two special
meta-classes are also pre-defined: all, and no.

all
Represents a conjunction of all allowed classes, and is provided
as a shorthand method of specifying all classes.


no
Is the invalid class, and any event mapped solely to this class
will not be audited. Turning auditing on to the all meta class
will not cause events mapped solely to the no class to be written
to the audit trail. This class is also used to map obsolete events
which are no longer generated. Obsolete events are retained to
process old audit trails files.

EXAMPLES

Example 1: Using an audit_class File

The following is an example of an audit_class file:


0x00000000:no:invalid class
0x00000001:fr:file read
0x00000002:fw:file write
0x00000004:fa:file attribute access
0x00000008:fm:file attribute modify
0x00000010:fc:file create
0x00000020:fd:file delete
0x00000040:cl:file close
0x00000100:nt:network
0x00000200:ip:ipc
0x00000400:na:non-attribute
0x00001000:lo:login or logout
0x00004000:ap:application
0x000f0000:ad:old administrative (meta-class)
0x00070000:am:administrative (meta-class)
0x00010000:ss:change system state
0x00020000:as:system-wide administration
0x00040000:ua:user administration
0x00080000:aa:audit utilization
0x00300000:pc:process (meta-class)
0x00100000:ps:process start/stop
0x00200000:pm:process modify
0x20000000:io:ioctl
0x40000000:ex:exec
0x80000000:ot:other
0xffffffff:all:all classes (meta-class)

FILES

/etc/security/audit_class

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+---------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------------+-----------------+
|Interface Stability | See below. |
+---------------------+-----------------+


The file format stability is Committed. The file content is Uncommitted.

SEE ALSO

au_preselect(3BSM), getauclassent(3BSM), audit_event(5), attributes(7)

NOTES

It is possible to deliberately turn on the no class in the kernel, in
which case the audit trail will be flooded with records for the audit
event AUE_NULL.

March 6, 2017 AUDIT_CLASS(5)