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Index for Section 8 |
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Alphabetical listing for A |
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auditmask(8)
NAME
auditmask - Gets or sets auditmasks
SYNOPSIS
/usr/sbin/auditmask [ flags ] [ event[:succeed:fail]] \
[-e,E file [args... ]] [< event_list]
FLAGS
-a audit_id
Sets the audit mask for all processes that have the specified audit ID
(audit_id). By specifying the audit ID of a user, all processes with
the specified audit ID are audited. The event list specified on the
command line becomes the auditmask for the target processes.
-c control_flag
Sets the value of the audit control flags for the target audit
processes. The -c flag can be used only in conjunction with the -a, -e,
-E, or -p flags. The audit control flag strings are as follows:
or An audit record is generated if either the system auditmask or the
process auditmask indicates such an event should be audited.
and An audit record is generated if both the system auditmask and the
process auditmask indicate such an event should be audited.
off No audit records are generated for the current process.
usr An audit record gets generated if the process auditmask indicates
such an event should be audited.
syscall_off
Turns off or on all system call auditing for the selected process
(or group of processes if based on login user). This option
provides in-depth process tracing by enabling auditing of all
system call events.
habitat_usr
Include the habitat audit events as described in the
/etc/sec/audit_events file.
-E file [args...]
Executes the file and audits all system calls and trusted events. The
args parameters are the arguments associated with the program file.
This option is useful for debugging.
-e file [args...]
Executes the file and audits under a specified mask. The args
parameters are the arguments associated with the program file.
-f If a process is specified, sets that process' auditmask to all events;
otherwise, sets the system auditmask to all events.
-h Displays a brief help message.
-n If a process is specified, clears that process' auditmask; otherwise,
clears the system auditmask.
-p pid [event[:succeed:fail]]
When one or more events are provided, sets the audit mask for a single
process specified by pid and events. The event list specified on the
command line modifies the settings for those events in the current
auditmask of the specified process. If only -p pid is specified, the
events being audited for the specified pid and the audcntl flag are
returned. The -p option is used to check a suspicious process in real
time.
-q filename
Query status of file filename for object selection/deselection.
-Q filelist
Query status of files in filelist relevant to object
selection/deselection.
-s audstyle
Sets the audit style characteristics of the audit subsystem as follows:
exec_argp
Enables the auditing of the argument list to an execv or execve
system call.
exec_envp
Enables the auditing of the environment strings to an execv or
execve system call.
login_uname
Enables the auditing of the user name in failed login attempts when
the user name is not recognized. (If the account name for a failed
access attempt is recognized, an entry is always generated in the
audit log.)
obj_sel
Enable object selection mode.
Specifying -c obj_sel or -c obj_sel:1 enables the object selection
mode. Specifying -c obj_sel:0 disables the object selection mode.
With the object selection mode enabled, data access operations
result in audit records being generated only if performed against a
specified file. See the -x and -X options, and the Security
manual.
obj_desel
Enable object deselection mode.
Specifying -c obj_desel or -c obj_desel:1 enables the deselection
mode. Specifying -c obj_desel:0 disables the deselection mode.
With the deselection mode enabled, data access operations on
specified files do not generate audit data. See the -y and -Y
options, and the Security manual.
-x filename[:1|:0]
Enable or disable selection on filename. No : or the presence of a :1
on the end of the argument enables the action; a :0 disables the
action.
-X filelist[:1|:0]
Enable or disable selection on the files in the filelist. No : or the
presence of a :1 on the end of the argument enables the action; a :0
disables the action.
-y filename[:1|:0]
Enable or disable deselection on filename. No : or the presence of a
:1 on the end of the argument enables the action; a :0 disables the
action.
-Y filelist[:1|:0]
Enable or disable deselection on the files in the filelist. No : or
the presence of a :1 on the end of the argument enables the action; a
:0 disables the action.
DESCRIPTION
The auditmask command is used to:
· Get or set the system auditmask and the audit style flag
· Get or set a process' auditmask and its audit control flag
· Execute a process under a specified auditmask
· Select or deselect filesystem objects
The system auditmask contains system calls (default list is in
/etc/sec/audit_events), trusted events (defined in audit.h), and site-
defined events (/etc/sec/site_events). The system auditmask is set during
the setup of the audit subsystem using the audit_setup script. The system
auditmask can be changed at any time using the auditmask command.
Under enhanced security (passwords), when a user logs in to the system, the
authentication database (/tcb/auth/files/<a-z>/username) is read and the
login process' audit characteristics are set according to the u_auditmask
and u_auditcntl entries. This auditmask and audit control flag are
inherited by all spawned processes.
Setting the audit control flag of a process automatically resets a previous
setting of AUDIT_SYSCALL_OFF for that process.
Getting the System Auditmask
The auditmask command with no arguments displays the system calls, trusted
events, and site events currently being audited for the system, and
indicates whether they are being audited under successful or failed
occurrences or both. The format used for the display is acceptable as
input to subsequent auditmask commands.
Setting the System Auditmask
The auditmask command with event arguments sets the system call, trusted
event, or site event audit masks for the system auditmask. This is a
cumulative operation, so it is possible to turn on or off audit for one set
of events, then turn on or off audit for a second set of events without
changing the first set of events (except for the intersection between the
two sets). Command line arguments to auditmask can include one or more
events, each with an optional field :succeed:fail, where succeed is either
0 to specify no auditing of successful occurrences of event or 1 to specify
auditing of successful occurrences of event; and fail is either 0 to
specify no auditing of failed occurrences of event or 1 to specify auditing
of failed occurrences of event. The event is one of the following:
· A system call name
· A trusted event name (see audit.h)
· A site-defined name in /etc/sec/site_events
· An alias defined in /etc/sec/event_aliases
The auditmask command will also accept redirected input, which can be the
output of a previously issued auditmask command. This is a file containing
lines in the following format:
event [succeed] [fail]
If the keyword succeed is present, successful occurrences of that event
will be audited; if the keyword fail is present, failed occurrences of that
event will be audited; if both are present, successful and failed
occurrences will be audited; if neither keyword is present, that event will
not be audited.
The auditmask command with the -s option is used to set the audit style
characteristics of the audit subsystem. See the description of the -s
option.
Getting and Setting Process' Auditmask
The audit characteristics for a process are made up of the process
auditmask and the audit control flag. The auditmask command can be used to
set or get the audit characteristics for a specified process. If no audit
characteristics are specified, auditmask gets the process' auditmask and
control flag; if any audit characteristics are specified, auditmask sets
the process' auditmask and/or the audit control flag.
Processes are specified as follows:
· A single process using the -p option
· A family of processes using the -a option
· A new process using the -e or -E option
Site-defined events and habitat system calls can be set only for the
system, as opposed to the processes. See the habitat_usr selection under
the -c control_flag flag.
A program can be executed with a specified auditmask using the -e or -E
options. This can be used to learn more about the program's behavior. The
-e and -E options set the process audit control flag to AUDIT_USR (unless
explicitly set otherwise).
Using Object Selection and Deselection
Object selection and deselection allows you to mark specified file objects
for either auditing or no auditing. In the object selection mode (-s
obj_sel), the following data access events always generate audit data for
the selected objects:
open
close
stat
link
lseek
access
statlstat
dup
revoke
readlink
fstat
dup2
getdirentries
The auditing on file objects not selected is determined by the active audit
events.
In the object selection mode (-s obj_sel), file objects that are deselected
generate no audit data from active audit events except for the data access
events listed above.
Note that processes with an flag of AUDIT_USR do not have their auditing
reduced through the selection/deselection mechanism.
EXAMPLES
The command line in the following example returns the auditmask and audit
control flag for process 999:
# auditmask -p 999
The command line in the following example executes the my_prog program with
the open system call added to its auditmask and no change to its audit
control flag:
# auditmask open -e my_prog
The command line in the following example executes the vi command on the
/etc/motd file with its auditmask set to audit all system calls and all
trusted events, and its audit control flag set to OR:
# auditmask -c or -E vi /etc/motd
RELATED INFORMATION
Commands: audit_setup(8)
Functions: audcntl(2)
Security