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 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.

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