1AUDIT2ALLOW(1) NSA AUDIT2ALLOW(1)
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6 audit2allow - generate SELinux policy allow/dontaudit rules from logs
7 of denied operations
8 audit2why - translates SELinux audit messages into a description of why
10 the access was denied (audit2allow -w)
11
14 audit2allow [options]
15
17 -a | --all
18 Read input from audit and message log, conflicts with -i
19 -b | --boot
21 Read input from audit messages since last boot conflicts with -i
22 -d | --dmesg
24 Read input from output of /bin/dmesg. Note that all audit mes‐
25 sages are not available via dmesg when auditd is running; use
26 "ausearch -m avc | audit2allow" or "-a" instead.
27 -D | --dontaudit
29 Generate dontaudit rules (Default: allow)
30 -h | --help
32 Print a short usage message
33 -i <inputfile> | --input <inputfile>
35 read input from <inputfile>
36 -l | --lastreload
38 read input only after last policy reload
39 -m <modulename> | --module <modulename>
41 Generate module/require output <modulename>
42 -M <modulename>
44 Generate loadable module package, conflicts with -o
45 -p <policyfile> | --policy <policyfile>
47 Policy file to use for analysis
48 -o <outputfile> | --output <outputfile>
50 append output to <outputfile>
51 -r | --requires
53 Generate require output syntax for loadable modules.
54 -N | --noreference
56 Do not generate reference policy, traditional style allow rules.
57 This is the default behavior.
58 -R | --reference
60 Generate reference policy using installed macros. This attempts
61 to match denials against interfaces and may be inaccurate.
62 -w | --why
64 Translates SELinux audit messages into a description of why the
65 access was denied
66 -v | --verbose
69 Turn on verbose output
70
73 This utility scans the logs for messages logged when the system denied
74 permission for operations, and generates a snippet of policy rules
75 which, if loaded into policy, might have allowed those operations to
76 succeed. However, this utility only generates Type Enforcement (TE)
77 allow rules. Certain permission denials may require other kinds of
78 policy changes, e.g. adding an attribute to a type declaration to sat‐
79 isfy an existing constraint, adding a role allow rule, or modifying a
80 constraint. The audit2why(8) utility may be used to diagnose the rea‐
81 son when it is unclear.
82 Care must be exercised while acting on the output of this utility to
84 ensure that the operations being permitted do not pose a security
85 threat. Often it is better to define new domains and/or types, or make
86 other structural changes to narrowly allow an optimal set of operations
87 to succeed, as opposed to blindly implementing the sometimes broad
88 changes recommended by this utility. Certain permission denials are
89 not fatal to the application, in which case it may be preferable to
90 simply suppress logging of the denial via a 'dontaudit' rule rather
91 than an 'allow' rule.
92
94 NOTE: These examples are for systems using the audit package. If you do
95 not use the audit package, the AVC messages will be in /var/log/messages.
96 Please substitute /var/log/messages for /var/log/audit/audit.log in the
97 examples.
98 Using audit2allow to generate monolithic (non-module) policy
100 $ cd /etc/selinux/$SELINUXTYPE/src/policy
101 $ cat /var/log/audit/audit.log | audit2allow >> domains/misc/local.te
102 $ cat domains/misc/local.te
103 allow cupsd_config_t unconfined_t:fifo_file { getattr ioctl };
104 <review domains/misc/local.te and customize as desired>
105 $ make load
106 Using audit2allow to generate module policy
108 $ cat /var/log/audit/audit.log | audit2allow -m local > local.te
110 $ cat local.te
111 module local 1.0;
112 require {
114 role system_r;
115 class fifo_file { getattr ioctl };
118 type cupsd_config_t;
121 type unconfined_t;
122 };
123 allow cupsd_config_t unconfined_t:fifo_file { getattr ioctl };
126 <review local.te and customize as desired>
127 Building module policy manually
129 # Compile the module
131 $ checkmodule -M -m -o local.mod local.te
132 # Create the package
133 $ semodule_package -o local.pp -m local.mod
134 # Load the module into the kernel
135 $ semodule -i local.pp
136 Using audit2allow to generate and build module policy
138 $ cat /var/log/audit/audit.log | audit2allow -M local
139 Generating type enforcment file: local.te
140 Compiling policy: checkmodule -M -m -o local.mod local.te
141 Building package: semodule_package -o local.pp -m local.mod
142 ******************** IMPORTANT ***********************
144 In order to load this newly created policy package into the kernel,
146 you are required to execute
147 semodule -i local.pp
149
152 This manual page was written by Manoj Srivastava <srivasta@debian.org>,
153 for the Debian GNU/Linux system. It was updated by Dan Walsh
154 <dwalsh@redhat.com>
155 The audit2allow utility has contributions from several people, includ‐
157 ing Justin R. Smith and Yuichi Nakamura. and Dan Walsh
158Security Enhanced Linux January 2005 AUDIT2ALLOW(1)