AUDIT2ALLOW(1)								NSA							    AUDIT2ALLOW(1)

NAME

       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)

SYNOPSIS

       audit2allow [options]

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 "ause-
	      arch -m avc | audit2allow"  or "-a" instead.

       -D | --dontaudit
	      Generate dontaudit rules (Default: allow)

       -h | --help
	      Print a short usage message

       -i  <inputfile> | --input <inputfile>
	      read input from <inputfile>

       -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

       -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.

       -w | --why
	      Translates SELinux audit messages into a description of why the access was denied

       -v | --verbose
	      Turn on verbose output

DESCRIPTION

       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  sat-
       isfy  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 opera-
       tions 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.

EXAMPLE

       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

AUTHOR

       This manual page was written by Manoj Srivastava <srivasta@debian.org>, for the Debian GNU/Linux  system.  It  was  updated  by	Dan  Walsh
       <dwalsh@redhat.com>

       The audit2allow utility has contributions from several people, including Justin R. Smith and Yuichi Nakamura.  and Dan Walsh

Security Enhanced Linux 					   October 2010 						    AUDIT2ALLOW(1)