1init_selinux(8) SELinux Policy init init_selinux(8)
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6 init_selinux - Security Enhanced Linux Policy for the init processes
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9 Security-Enhanced Linux secures the init processes via flexible manda‐
10 tory access control.
11 The init processes execute with the init_t SELinux type. You can check
13 if you have these processes running by executing the ps command with
14 the -Z qualifier.
15 For example:
17 ps -eZ | grep init_t
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23 The init_t SELinux type can be entered via the init_exec_t file type.
24 The default entrypoint paths for the init_t domain are the following:
26 /sbin/init(ng)?, /usr/sbin/init(ng)?, /usr/lib/systemd/[^/]*,
28 /usr/lib/systemd/system-generators/[^/]*, /bin/systemd, /sbin/upstart,
29 /usr/bin/systemd, /usr/sbin/upstart
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32 SELinux defines process types (domains) for each process running on the
33 system
34 You can see the context of a process using the -Z option to ps
36 Policy governs the access confined processes have to files. SELinux
38 init policy is very flexible allowing users to setup their init pro‐
39 cesses in as secure a method as possible.
40 The following process types are defined for init:
42 init_t, initrc_t
44 Note: semanage permissive -a init_t can be used to make the process
46 type init_t permissive. SELinux does not deny access to permissive
47 process types, but the AVC (SELinux denials) messages are still gener‐
48 ated.
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52 SELinux policy is customizable based on least access required. init
53 policy is extremely flexible and has several booleans that allow you to
54 manipulate the policy and run init with the tightest access possible.
55 If you want to allow users to resolve user passwd entries directly from
59 ldap rather then using a sssd server, you must turn on the authlo‐
60 gin_nsswitch_use_ldap boolean. Disabled by default.
61 setsebool -P authlogin_nsswitch_use_ldap 1
63 If you want to deny user domains applications to map a memory region as
67 both executable and writable, this is dangerous and the executable
68 should be reported in bugzilla, you must turn on the deny_execmem bool‐
69 ean. Enabled by default.
70 setsebool -P deny_execmem 1
72 If you want to deny any process from ptracing or debugging any other
76 processes, you must turn on the deny_ptrace boolean. Enabled by
77 default.
78 setsebool -P deny_ptrace 1
80 If you want to allow any process to mmap any file on system with
84 attribute file_type, you must turn on the domain_can_mmap_files bool‐
85 ean. Enabled by default.
86 setsebool -P domain_can_mmap_files 1
88 If you want to allow all domains write to kmsg_device, while kernel is
92 executed with systemd.log_target=kmsg parameter, you must turn on the
93 domain_can_write_kmsg boolean. Disabled by default.
94 setsebool -P domain_can_write_kmsg 1
96 If you want to allow all domains to use other domains file descriptors,
100 you must turn on the domain_fd_use boolean. Enabled by default.
101 setsebool -P domain_fd_use 1
103 If you want to allow all domains to have the kernel load modules, you
107 must turn on the domain_kernel_load_modules boolean. Disabled by
108 default.
109 setsebool -P domain_kernel_load_modules 1
111 If you want to allow all domains to execute in fips_mode, you must turn
115 on the fips_mode boolean. Enabled by default.
116 setsebool -P fips_mode 1
118 If you want to enable reading of urandom for all domains, you must turn
122 on the global_ssp boolean. Disabled by default.
123 setsebool -P global_ssp 1
125 If you want to allow confined applications to run with kerberos, you
129 must turn on the kerberos_enabled boolean. Enabled by default.
130 setsebool -P kerberos_enabled 1
132 If you want to control the ability to mmap a low area of the address
136 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
137 the mmap_low_allowed boolean. Disabled by default.
138 setsebool -P mmap_low_allowed 1
140 If you want to allow system to run with NIS, you must turn on the
144 nis_enabled boolean. Disabled by default.
145 setsebool -P nis_enabled 1
147 If you want to allow confined applications to use nscd shared memory,
151 you must turn on the nscd_use_shm boolean. Disabled by default.
152 setsebool -P nscd_use_shm 1
154 If you want to disable kernel module loading, you must turn on the
158 secure_mode_insmod boolean. Enabled by default.
159 setsebool -P secure_mode_insmod 1
161 If you want to boolean to determine whether the system permits loading
165 policy, setting enforcing mode, and changing boolean values. Set this
166 to true and you have to reboot to set it back, you must turn on the
167 secure_mode_policyload boolean. Enabled by default.
168 setsebool -P secure_mode_policyload 1
170 If you want to allow unconfined executables to make their heap memory
174 executable. Doing this is a really bad idea. Probably indicates a
175 badly coded executable, but could indicate an attack. This executable
176 should be reported in bugzilla, you must turn on the selin‐
177 uxuser_execheap boolean. Disabled by default.
178 setsebool -P selinuxuser_execheap 1
180 If you want to allow all unconfined executables to use libraries
184 requiring text relocation that are not labeled textrel_shlib_t, you
185 must turn on the selinuxuser_execmod boolean. Enabled by default.
186 setsebool -P selinuxuser_execmod 1
188 If you want to allow unconfined executables to make their stack exe‐
192 cutable. This should never, ever be necessary. Probably indicates a
193 badly coded executable, but could indicate an attack. This executable
194 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
195 stack boolean. Enabled by default.
196 setsebool -P selinuxuser_execstack 1
198 If you want to support X userspace object manager, you must turn on the
202 xserver_object_manager boolean. Enabled by default.
203 setsebool -P xserver_object_manager 1
205
209 The SELinux process type init_t can manage files labeled with the fol‐
210 lowing file types. The paths listed are the default paths for these
211 file types. Note the processes UID still need to have DAC permissions.
212 file_type
214 all files on the system
216
219 SELinux requires files to have an extended attribute to define the file
220 type.
221 You can see the context of a file using the -Z option to ls
223 Policy governs the access confined processes have to these files.
225 SELinux init policy is very flexible allowing users to setup their init
226 processes in as secure a method as possible.
227 EQUIVALENCE DIRECTORIES
229 init policy stores data with multiple different file context types
232 under the /var/run/systemd directory. If you would like to store the
233 data in a different directory you can use the semanage command to cre‐
234 ate an equivalence mapping. If you wanted to store this data under the
235 /srv dirctory you would execute the following command:
236 semanage fcontext -a -e /var/run/systemd /srv/systemd
238 restorecon -R -v /srv/systemd
239 STANDARD FILE CONTEXT
241 SELinux defines the file context types for the init, if you wanted to
243 store files with these types in a diffent paths, you need to execute
244 the semanage command to sepecify alternate labeling and then use
245 restorecon to put the labels on disk.
246 semanage fcontext -a -t initrc_var_run_t '/srv/myinit_content(/.*)?'
248 restorecon -R -v /srv/myinit_content
249 Note: SELinux often uses regular expressions to specify labels that
251 match multiple files.
252 The following file types are defined for init:
254 init_exec_t
258 - Set files with the init_exec_t type, if you want to transition an
260 executable to the init_t domain.
261 Paths:
264 /sbin/init(ng)?, /usr/sbin/init(ng)?, /usr/lib/systemd/[^/]*,
265 /usr/lib/systemd/system-generators/[^/]*, /bin/systemd,
266 /sbin/upstart, /usr/bin/systemd, /usr/sbin/upstart
267 init_tmp_t
270 - Set files with the init_tmp_t type, if you want to store init tempo‐
272 rary files in the /tmp directories.
273 init_var_lib_t
277 - Set files with the init_var_lib_t type, if you want to store the init
279 files under the /var/lib directory.
280 init_var_run_t
284 - Set files with the init_var_run_t type, if you want to store the init
286 files under the /run or /var/run directory.
287 initctl_t
291 - Set files with the initctl_t type, if you want to treat the files as
293 initctl data.
294 Paths:
297 /dev/initctl, /var/run/initctl, /var/run/systemd/initctl/fifo
298 initrc_devpts_t
301 - Set files with the initrc_devpts_t type, if you want to treat the
303 files as initrc devpts data.
304 initrc_exec_t
308 - Set files with the initrc_exec_t type, if you want to transition an
310 executable to the initrc_t domain.
311 Paths:
314 /etc/init.d/.*, /etc/rc.d/rc.[^/]+, /etc/rc.d/init.d/.*,
315 /opt/nfast/sbin/init.d-ncipher, /usr/lib/systemd/rhel[^/]*,
316 /usr/libexec/dcc/stop-.*, /usr/libexec/dcc/start-.*,
317 /opt/nfast/scripts/init.d/(.*), /etc/rc.d/rc, /etc/X11/prefdm,
318 /usr/sbin/startx, /usr/bin/sepg_ctl, /usr/sbin/apachectl,
319 /usr/sbin/start-dirsrv, /usr/sbin/open_init_pty,
320 /usr/sbin/restart-dirsrv, /etc/sysconfig/network-scripts/ifup-
321 ipsec, /usr/share/system-config-services/system-config-services-
322 mechanism.py
323 initrc_state_t
326 - Set files with the initrc_state_t type, if you want to treat the
328 files as initrc state data.
329 initrc_tmp_t
333 - Set files with the initrc_tmp_t type, if you want to store initrc
335 temporary files in the /tmp directories.
336 initrc_var_log_t
340 - Set files with the initrc_var_log_t type, if you want to treat the
342 data as initrc var log data, usually stored under the /var/log direc‐
343 tory.
344 initrc_var_run_t
348 - Set files with the initrc_var_run_t type, if you want to store the
350 initrc files under the /run or /var/run directory.
351 Paths:
354 /var/run/utmp, /var/run/random-seed, /var/run/runlevel.dir,
355 /var/run/setmixer_flag
356 Note: File context can be temporarily modified with the chcon command.
359 If you want to permanently change the file context you need to use the
360 semanage fcontext command. This will modify the SELinux labeling data‐
361 base. You will need to use restorecon to apply the labels.
362
365 semanage fcontext can also be used to manipulate default file context
366 mappings.
367 semanage permissive can also be used to manipulate whether or not a
369 process type is permissive.
370 semanage module can also be used to enable/disable/install/remove pol‐
372 icy modules.
373 semanage boolean can also be used to manipulate the booleans
375 system-config-selinux is a GUI tool available to customize SELinux pol‐
378 icy settings.
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382 This manual page was auto-generated using sepolicy manpage .
383
386 selinux(8), init(8), semanage(8), restorecon(8), chcon(1), sepolicy(8)
387 , setsebool(8)
388init 19-04-25 init_selinux(8)