1crontab_selinux(8) SELinux Policy crontab crontab_selinux(8)
2
3
4
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
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
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
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
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 all domains to execute in fips_mode, you must turn
62 on the fips_mode boolean. Enabled by default.
63
64 setsebool -P fips_mode 1
65
66
67
68 If you want to allow system to run with NIS, you must turn on the
69 nis_enabled boolean. Disabled by default.
70
71 setsebool -P nis_enabled 1
72
73
74
76 The SELinux process type crontab_t can manage files labeled with the
77 following file types. The paths listed are the default paths for these
78 file types. Note the processes UID still need to have DAC permissions.
79
80 cgroup_t
81
82 /sys/fs/cgroup
83
84 faillog_t
85
86 /var/log/btmp.*
87 /var/log/faillog.*
88 /var/log/tallylog.*
89 /var/run/faillock(/.*)?
90
91 var_auth_t
92
93 /var/ace(/.*)?
94 /var/rsa(/.*)?
95 /var/lib/abl(/.*)?
96 /var/lib/rsa(/.*)?
97 /var/lib/pam_ssh(/.*)?
98 /var/lib/pam_shield(/.*)?
99 /var/opt/quest/vas/vasd(/.*)?
100 /var/lib/google-authenticator(/.*)?
101
102
104 SELinux requires files to have an extended attribute to define the file
105 type.
106
107 You can see the context of a file using the -Z option to ls
108
109 Policy governs the access confined processes have to these files.
110 SELinux crontab policy is very flexible allowing users to setup their
111 crontab processes in as secure a method as possible.
112
113 STANDARD FILE CONTEXT
114
115 SELinux defines the file context types for the crontab, if you wanted
116 to store files with these types in a diffent paths, you need to execute
117 the semanage command to sepecify alternate labeling and then use
118 restorecon to put the labels on disk.
119
120 semanage fcontext -a -t crontab_tmp_t '/srv/mycrontab_content(/.*)?'
121 restorecon -R -v /srv/mycrontab_content
122
123 Note: SELinux often uses regular expressions to specify labels that
124 match multiple files.
125
126 The following file types are defined for crontab:
127
128
129
130 crontab_exec_t
131
132 - Set files with the crontab_exec_t type, if you want to transition an
133 executable to the crontab_t domain.
134
135
136 Paths:
137 /usr/bin/(f)?crontab, /usr/bin/at, /usr/sbin/fcronsighup,
138 /usr/libexec/fcronsighup
139
140
141 crontab_tmp_t
142
143 - Set files with the crontab_tmp_t type, if you want to store crontab
144 temporary files in the /tmp directories.
145
146
147
148 Note: File context can be temporarily modified with the chcon command.
149 If you want to permanently change the file context you need to use the
150 semanage fcontext command. This will modify the SELinux labeling data‐
151 base. You will need to use restorecon to apply the labels.
152
153
155 semanage fcontext can also be used to manipulate default file context
156 mappings.
157
158 semanage permissive can also be used to manipulate whether or not a
159 process type is permissive.
160
161 semanage module can also be used to enable/disable/install/remove pol‐
162 icy modules.
163
164 semanage boolean can also be used to manipulate the booleans
165
166
167 system-config-selinux is a GUI tool available to customize SELinux pol‐
168 icy settings.
169
170
172 This manual page was auto-generated using sepolicy manpage .
173
174
176 selinux(8), crontab(8), semanage(8), restorecon(8), chcon(1), sepol‐
177 icy(8), setsebool(8)
178
179
180
181crontab 21-03-26 crontab_selinux(8)