crontab_selinux(8)

1crontab_selinux(8)          SELinux Policy crontab          crontab_selinux(8)
2
3
4

NAME

6       crontab_selinux  -  Security Enhanced Linux Policy for the crontab pro‐
7       cesses
8

DESCRIPTION

10       Security-Enhanced Linux secures  the  crontab  processes  via  flexible
11       mandatory access control.
12
13       The  crontab processes execute with the crontab_t SELinux type. You can
14       check if you have these processes running by executing the  ps  command
15       with the -Z qualifier.
16
17       For example:
18
19       ps -eZ | grep crontab_t
20
21
22

ENTRYPOINTS

24       The  crontab_t  SELinux type can be entered via the crontab_exec_t file
25       type.
26
27       The default entrypoint paths for the crontab_t domain are  the  follow‐
28       ing:
29
30       /usr/bin/(f)?crontab,        /usr/bin/at,        /usr/sbin/fcronsighup,
31       /usr/libexec/fcronsighup
32

PROCESS TYPES

34       SELinux defines process types (domains) for each process running on the
35       system
36
37       You can see the context of a process using the -Z option to ps
38
39       Policy  governs  the  access confined processes have to files.  SELinux
40       crontab policy is very flexible allowing users to setup  their  crontab
41       processes in as secure a method as possible.
42
43       The following process types are defined for crontab:
44
45       crontab_t
46
47       Note:  semanage permissive -a crontab_t can be used to make the process
48       type crontab_t permissive. SELinux does not deny access  to  permissive
49       process  types, but the AVC (SELinux denials) messages are still gener‐
50       ated.
51
52

BOOLEANS

54       SELinux policy is customizable based on least access required.  crontab
55       policy is extremely flexible and has several booleans that allow you to
56       manipulate the policy and run crontab with the tightest  access  possi‐
57       ble.
58
59
60
61       If you want to allow users to resolve user passwd entries directly from
62       ldap rather then using a sssd server, you  must  turn  on  the  authlo‐
63       gin_nsswitch_use_ldap boolean. Disabled by default.
64
65       setsebool -P authlogin_nsswitch_use_ldap 1
66
67
68
69       If  you  want  to deny any process from ptracing or debugging any other
70       processes, you  must  turn  on  the  deny_ptrace  boolean.  Enabled  by
71       default.
72
73       setsebool -P deny_ptrace 1
74
75
76
77       If  you  want  to  allow  any  process  to mmap any file on system with
78       attribute file_type, you must turn on the  domain_can_mmap_files  bool‐
79       ean. Enabled by default.
80
81       setsebool -P domain_can_mmap_files 1
82
83
84
85       If  you want to allow all domains write to kmsg_device, while kernel is
86       executed with systemd.log_target=kmsg parameter, you must turn  on  the
87       domain_can_write_kmsg boolean. Disabled by default.
88
89       setsebool -P domain_can_write_kmsg 1
90
91
92
93       If you want to allow all domains to use other domains file descriptors,
94       you must turn on the domain_fd_use boolean. Enabled by default.
95
96       setsebool -P domain_fd_use 1
97
98
99
100       If you want to allow all domains to have the kernel load  modules,  you
101       must  turn  on  the  domain_kernel_load_modules  boolean.  Disabled  by
102       default.
103
104       setsebool -P domain_kernel_load_modules 1
105
106
107
108       If you want to allow all domains to execute in fips_mode, you must turn
109       on the fips_mode boolean. Enabled by default.
110
111       setsebool -P fips_mode 1
112
113
114
115       If you want to enable reading of urandom for all domains, you must turn
116       on the global_ssp boolean. Disabled by default.
117
118       setsebool -P global_ssp 1
119
120
121
122       If you want to allow confined applications to run  with  kerberos,  you
123       must turn on the kerberos_enabled boolean. Enabled by default.
124
125       setsebool -P kerberos_enabled 1
126
127
128
129       If  you  want  to  allow  system  to run with NIS, you must turn on the
130       nis_enabled boolean. Disabled by default.
131
132       setsebool -P nis_enabled 1
133
134
135
136       If you want to allow confined applications to use nscd  shared  memory,
137       you must turn on the nscd_use_shm boolean. Disabled by default.
138
139       setsebool -P nscd_use_shm 1
140
141
142
143       If  you want to support ecryptfs home directories, you must turn on the
144       use_ecryptfs_home_dirs boolean. Disabled by default.
145
146       setsebool -P use_ecryptfs_home_dirs 1
147
148
149
150       If you want to support fusefs home directories, you must  turn  on  the
151       use_fusefs_home_dirs boolean. Disabled by default.
152
153       setsebool -P use_fusefs_home_dirs 1
154
155
156
157       If  you  want  to  support  NFS  home directories, you must turn on the
158       use_nfs_home_dirs boolean. Disabled by default.
159
160       setsebool -P use_nfs_home_dirs 1
161
162
163
164       If you want to support SAMBA home directories, you  must  turn  on  the
165       use_samba_home_dirs boolean. Disabled by default.
166
167       setsebool -P use_samba_home_dirs 1
168
169
170

MANAGED FILES

172       The  SELinux  process  type crontab_t can manage files labeled with the
173       following file types.  The paths listed are the default paths for these
174       file types.  Note the processes UID still need to have DAC permissions.
175
176       cgroup_t
177
178            /sys/fs/cgroup
179
180       crontab_tmp_t
181
182
183       faillog_t
184
185            /var/log/btmp.*
186            /var/log/faillog.*
187            /var/log/tallylog.*
188            /var/run/faillock(/.*)?
189
190       user_cron_spool_t
191
192            /var/spool/at(/.*)?
193            /var/spool/cron
194
195       user_tmp_t
196
197            /dev/shm/mono.*
198            /var/run/user(/.*)?
199            /tmp/.X11-unix(/.*)?
200            /tmp/.ICE-unix(/.*)?
201            /dev/shm/pulse-shm.*
202            /tmp/.X0-lock
203            /tmp/hsperfdata_root
204            /var/tmp/hsperfdata_root
205            /home/[^/]+/tmp
206            /home/[^/]+/.tmp
207            /tmp/gconfd-[^/]+
208
209       var_auth_t
210
211            /var/ace(/.*)?
212            /var/rsa(/.*)?
213            /var/lib/abl(/.*)?
214            /var/lib/rsa(/.*)?
215            /var/lib/pam_ssh(/.*)?
216            /var/run/pam_ssh(/.*)?
217            /var/lib/pam_shield(/.*)?
218            /var/opt/quest/vas/vasd(/.*)?
219            /var/lib/google-authenticator(/.*)?
220
221

FILE CONTEXTS

223       SELinux requires files to have an extended attribute to define the file
224       type.
225
226       You can see the context of a file using the -Z option to ls
227
228       Policy governs the access  confined  processes  have  to  these  files.
229       SELinux  crontab  policy is very flexible allowing users to setup their
230       crontab processes in as secure a method as possible.
231
232       STANDARD FILE CONTEXT
233
234       SELinux defines the file context types for the crontab, if  you  wanted
235       to store files with these types in a diffent paths, you need to execute
236       the semanage command  to  sepecify  alternate  labeling  and  then  use
237       restorecon to put the labels on disk.
238
239       semanage fcontext -a -t crontab_tmp_t '/srv/mycrontab_content(/.*)?'
240       restorecon -R -v /srv/mycrontab_content
241
242       Note:  SELinux  often  uses  regular expressions to specify labels that
243       match multiple files.
244
245       The following file types are defined for crontab:
246
247
248
249       crontab_exec_t
250
251       - Set files with the crontab_exec_t type, if you want to transition  an
252       executable to the crontab_t domain.
253
254
255       Paths:
256            /usr/bin/(f)?crontab,      /usr/bin/at,     /usr/sbin/fcronsighup,
257            /usr/libexec/fcronsighup
258
259
260       crontab_tmp_t
261
262       - Set files with the crontab_tmp_t type, if you want to  store  crontab
263       temporary files in the /tmp directories.
264
265
266
267       Note:  File context can be temporarily modified with the chcon command.
268       If you want to permanently change the file context you need to use  the
269       semanage fcontext command.  This will modify the SELinux labeling data‐
270       base.  You will need to use restorecon to apply the labels.
271
272

COMMANDS

274       semanage fcontext can also be used to manipulate default  file  context
275       mappings.
276
277       semanage  permissive  can  also  be used to manipulate whether or not a
278       process type is permissive.
279
280       semanage module can also be used to enable/disable/install/remove  pol‐
281       icy modules.
282
283       semanage boolean can also be used to manipulate the booleans
284
285
286       system-config-selinux is a GUI tool available to customize SELinux pol‐
287       icy settings.
288
289

AUTHOR

291       This manual page was auto-generated using sepolicy manpage .
292
293