1crontab_selinux(8) SELinux Policy crontab crontab_selinux(8)
2
6 crontab_selinux - Security Enhanced Linux Policy for the crontab pro‐
7 cesses
8
10 Security-Enhanced Linux secures the crontab processes via flexible
11 mandatory access control.
12 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 For example:
18 ps -eZ | grep crontab_t
20
24 The crontab_t SELinux type can be entered via the crontab_exec_t file
25 type.
26 The default entrypoint paths for the crontab_t domain are the follow‐
28 ing:
29 /usr/bin/(f)?crontab, /usr/bin/at, /usr/sbin/fcronsighup,
31 /usr/libexec/fcronsighup
32
34 SELinux defines process types (domains) for each process running on the
35 system
36 You can see the context of a process using the -Z option to ps
38 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 The following process types are defined for crontab:
44 crontab_t
46 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
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 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 setsebool -P authlogin_nsswitch_use_ldap 1
66 If you want to allow all domains to execute in fips_mode, you must turn
70 on the fips_mode boolean. Enabled by default.
71 setsebool -P fips_mode 1
73 If you want to allow confined applications to run with kerberos, you
77 must turn on the kerberos_enabled boolean. Enabled by default.
78 setsebool -P kerberos_enabled 1
80 If you want to allow system to run with NIS, you must turn on the
84 nis_enabled boolean. Disabled by default.
85 setsebool -P nis_enabled 1
87 If you want to allow confined applications to use nscd shared memory,
91 you must turn on the nscd_use_shm boolean. Disabled by default.
92 setsebool -P nscd_use_shm 1
94
98 The SELinux process type crontab_t can manage files labeled with the
99 following file types. The paths listed are the default paths for these
100 file types. Note the processes UID still need to have DAC permissions.
101 cgroup_t
103 /sys/fs/cgroup
105 crontab_tmp_t
107 faillog_t
110 /var/log/btmp.*
112 /var/log/faillog.*
113 /var/log/tallylog.*
114 /var/run/faillock(/.*)?
115 user_cron_spool_t
117 /var/spool/at(/.*)?
119 /var/spool/cron
120 user_tmp_t
122 /dev/shm/mono.*
124 /var/run/user(/.*)?
125 /tmp/.ICE-unix(/.*)?
126 /tmp/.X11-unix(/.*)?
127 /dev/shm/pulse-shm.*
128 /tmp/.X0-lock
129 /tmp/hsperfdata_root
130 /var/tmp/hsperfdata_root
131 /home/[^/]+/tmp
132 /home/[^/]+/.tmp
133 /tmp/gconfd-[^/]+
134 var_auth_t
136 /var/ace(/.*)?
138 /var/rsa(/.*)?
139 /var/lib/abl(/.*)?
140 /var/lib/rsa(/.*)?
141 /var/lib/pam_ssh(/.*)?
142 /var/run/pam_ssh(/.*)?
143 /var/lib/pam_shield(/.*)?
144 /var/opt/quest/vas/vasd(/.*)?
145 /var/lib/google-authenticator(/.*)?
146
149 SELinux requires files to have an extended attribute to define the file
150 type.
151 You can see the context of a file using the -Z option to ls
153 Policy governs the access confined processes have to these files.
155 SELinux crontab policy is very flexible allowing users to setup their
156 crontab processes in as secure a method as possible.
157 STANDARD FILE CONTEXT
159 SELinux defines the file context types for the crontab, if you wanted
161 to store files with these types in a diffent paths, you need to execute
162 the semanage command to sepecify alternate labeling and then use
163 restorecon to put the labels on disk.
164 semanage fcontext -a -t crontab_tmp_t '/srv/mycrontab_content(/.*)?'
166 restorecon -R -v /srv/mycrontab_content
167 Note: SELinux often uses regular expressions to specify labels that
169 match multiple files.
170 The following file types are defined for crontab:
172 crontab_exec_t
176 - Set files with the crontab_exec_t type, if you want to transition an
178 executable to the crontab_t domain.
179 Paths:
182 /usr/bin/(f)?crontab, /usr/bin/at, /usr/sbin/fcronsighup,
183 /usr/libexec/fcronsighup
184 crontab_tmp_t
187 - Set files with the crontab_tmp_t type, if you want to store crontab
189 temporary files in the /tmp directories.
190 Note: File context can be temporarily modified with the chcon command.
194 If you want to permanently change the file context you need to use the
195 semanage fcontext command. This will modify the SELinux labeling data‐
196 base. You will need to use restorecon to apply the labels.
197
200 semanage fcontext can also be used to manipulate default file context
201 mappings.
202 semanage permissive can also be used to manipulate whether or not a
204 process type is permissive.
205 semanage module can also be used to enable/disable/install/remove pol‐
207 icy modules.
208 semanage boolean can also be used to manipulate the booleans
210 system-config-selinux is a GUI tool available to customize SELinux pol‐
213 icy settings.
214
217 This manual page was auto-generated using sepolicy manpage .
218
221 selinux(8), crontab(8), semanage(8), restorecon(8), chcon(1), sepol‐
222 icy(8), setsebool(8)
223crontab 19-05-30 crontab_selinux(8)