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 "ausearch -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 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  nar-
       rowly  allow an optimal set of operations to succeed, as opposed to blindly implementing the sometimes broad changes rec-
       ommended by this utility.   Certain permission denials are not fatal to the application, in which case it may be  prefer-
       able 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
       # You can create a te file and compile it by executing
       $ make -f /usr/share/selinux/devel/Makefile
       $ 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 enforcment 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 <srivastaATdebian.org>, for the Debian GNU/Linux system. It was updated
       by Dan Walsh <dwalshATredhat.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)