GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.4 |
|
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audit2allow(1) |
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audit2allow − generate SELinux policy allow rules from logs of denied operations
audit2allow [options]
−a | −−all
Read input from audit and message log, 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.
−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
−o <outputfile> | −−output <outputfile>
append output to <outputfile>
−r | −−requires
Generate require output syntax for loadable modules.
−R | −−reference
Generate reference policy using installed macros. Requires the selinux-policy-devel package.
−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 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
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 {
role system_r;
class fifo_file { getattr ioctl };
type
cupsd_config_t;
type unconfined_t;
};
allow
cupsd_config_t unconfined_t:fifo_file { getattr ioctl };
<review local.te and customize as desired>
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
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
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audit2allow(1) | |