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NAME | SYNOPSIS | OPTIONS | DESCRIPTION | EXAMPLE | AUTHOR | COLOPHON |
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AUDIT2ALLOW(1) NSA AUDIT2ALLOW(1)
audit2allow - generate SELinux policy allow/dontaudit rules from
logs of denied operations
audit2why - translates SELinux audit messages into a description
of why the access was denied (audit2allow -w)
audit2allow [options]
-a | --all
Read input from audit and message log, conflicts with -i
-b | --boot
Read input from audit messages since last boot, conflicts
with -i
-d | --dmesg
Read input from output of /bin/dmesg. Note that all audit
messages are not available via dmesg when auditd is
running; use "ausearch -m avc | audit2allow" or "-a"
instead.
-D | --dontaudit
Generate dontaudit rules (Default: allow)
-e | --explain
Fully explain generated output
-h | --help
Print a short usage message
-i <inputfile> | --input <inputfile>
Read input from <inputfile>
--interface-info=<interface_info_file>
Read interface information from <interface_info_file>
-l | --lastreload
Read input only after last policy reload
-m <modulename> | --module <modulename>
Generate module/require output <modulename>
-M <modulename>
Generate loadable module package, conflicts with -o
-p <policyfile> | --policy <policyfile>
Policy file to use for analysis
--perm-map <perm_map_file>
Read permission map from <perm_map_file>
-o <outputfile> | --output <outputfile>
Append output to <outputfile>
-r | --requires
Generate require output syntax for loadable modules.
-N | --noreference
Do not generate reference policy, traditional style allow
rules. This is the default behavior.
-R | --reference
Generate reference policy using installed macros. This
attempts to match denials against interfaces and may be
inaccurate.
-t <type_regex> | --type=<type_regex>
Only process messages with a type that matches this regex
-x | --xperms
Generate extended permission access vector rules
-w | --why
Translates SELinux audit messages into a description of
why the access was denied
-v | --verbose
Turn on verbose output
This utility scans the logs for messages logged when the system
denied permission for operations, and generates a snippet of
policy rules which, if loaded into policy, might have allowed
those operations to succeed. However, this utility only generates
Type Enforcement (TE) allow rules. Certain permission denials
may require other kinds of policy changes, e.g. adding an
attribute to a type declaration to satisfy an existing
constraint, adding a role allow rule, or modifying a constraint.
The audit2why(8) utility may be used to diagnose the reason when
it is unclear.
Care must be exercised while acting on the output of this utility
to ensure that the operations being permitted do not pose a
security threat. Often it is better to define new domains and/or
types, or make other structural changes to narrowly allow an
optimal set of operations to succeed, as opposed to blindly
implementing the sometimes broad changes recommended by this
utility. Certain permission denials are not fatal to the
application, in which case it may be preferable to simply
suppress logging of the denial via a 'dontaudit' rule rather than
an 'allow' rule.
NOTE: These examples are for systems using the audit package. If you do
not use the audit package, the AVC messages will be in /var/log/messages.
Please substitute /var/log/messages for /var/log/audit/audit.log in the
examples.
Using audit2allow to generate module policy
$ cat /var/log/audit/audit.log | audit2allow -m local > local.te
$ cat local.te
module local 1.0;
require {
class file { getattr open read };
type myapp_t;
type etc_t;
};
allow myapp_t etc_t:file { getattr open read };
<review local.te and customize as desired>
Using audit2allow to generate module policy using reference policy
$ cat /var/log/audit/audit.log | audit2allow -R -m local > local.te
$ cat local.te
policy_module(local, 1.0)
gen_require(`
type myapp_t;
type etc_t;
')
files_read_etc_files(myapp_t)
<review local.te and customize as desired>
Building module policy using Makefile
# SELinux provides a policy devel environment under
# /usr/share/selinux/devel including all of the shipped
# interface files.
# You can create a te file and compile it by executing
$ make -f /usr/share/selinux/devel/Makefile local.pp
# This make command will compile a local.te file in the current
# directory. If you did not specify a "pp" file, the make file
# will compile all "te" files in the current directory. After
# you compile your te file into a "pp" file, you need to install
# it using the semodule command.
$ semodule -i local.pp
Building module policy manually
# Compile the module
$ checkmodule -M -m -o local.mod local.te
# Create the package
$ semodule_package -o local.pp -m local.mod
# Load the module into the kernel
$ semodule -i local.pp
Using audit2allow to generate and build module policy
$ cat /var/log/audit/audit.log | audit2allow -M local
Generating type enforcement file: local.te
Compiling policy: checkmodule -M -m -o local.mod local.te
Building package: semodule_package -o local.pp -m local.mod
******************** IMPORTANT ***********************
In order to load this newly created policy package into the kernel,
you are required to execute
semodule -i local.pp
Using audit2allow to generate monolithic (non-module) policy
$ cd /etc/selinux/$SELINUXTYPE/src/policy
$ cat /var/log/audit/audit.log | audit2allow >> domains/misc/local.te
$ cat domains/misc/local.te
allow cupsd_config_t unconfined_t:fifo_file { getattr ioctl };
<review domains/misc/local.te and customize as desired>
$ make load
This manual page was written by Manoj Srivastava
<[email protected]>, for the Debian GNU/Linux system. It was
updated by Dan Walsh <[email protected]>
The audit2allow utility has contributions from several people,
including Justin R. Smith and Yuichi Nakamura. and Dan Walsh
This page is part of the selinux (Security-Enhanced Linux user-
space libraries and tools) project. Information about the
project can be found at
⟨https://github.com/SELinuxProject/selinux/wiki⟩. If you have a
bug report for this manual page, see
⟨https://github.com/SELinuxProject/selinux/wiki/Contributing⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/SELinuxProject/selinux⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-05-11.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
Security Enhanced Linux October 2010 AUDIT2ALLOW(1)
Pages that refer to this page: pmdaopenmetrics(1)
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HTML rendering created 2023-12-22 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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