1system_cronjob_selinux(8)SELinux Policy system_cronjobsystem_cronjob_selinux(8)
2
6 system_cronjob_selinux - Security Enhanced Linux Policy for the sys‐
7 tem_cronjob processes
8
10 Security-Enhanced Linux secures the system_cronjob processes via flexi‐
11 ble mandatory access control.
12 The system_cronjob processes execute with the system_cronjob_t SELinux
14 type. You can check if you have these processes running by executing
15 the ps command with the -Z qualifier.
16 For example:
18 ps -eZ | grep system_cronjob_t
20
24 The system_cronjob_t SELinux type can be entered via the sys‐
25 tem_cron_spool_t, usr_t, bin_t, anacron_exec_t, shell_exec_t, fusefs_t,
26 nfs_t, cifs_t file types.
27 The default entrypoint paths for the system_cronjob_t domain are the
29 following:
30 All executables with the default executable label, usually stored in
32 /usr/bin and /usr/sbin. /etc/cron.d(/.*)?, /var/spool/anacron(/.*)?,
33 /etc/crontab, /var/spool/fcron/systab, /var/spool/fcron/new.systab,
34 /var/spool/fcron/systab.orig, /opt/.*, /usr/.*, /emul/.*, /ex‐
35 port(/.*)?, /ostree(/.*)?, /usr/doc(/.*)?/lib(/.*)?, /usr/in‐
36 clu.e(/.*)?, /usr/share/rpm(/.*)?, /usr/share/doc(/.*)?/README.*,
37 /usr/lib/modules(/.*)/vmlinuz, /usr/lib/modules(/.*)/initramfs.img,
38 /usr/lib/sysimage(/.*)?, /usr/lib/ostree-boot(/.*)?, /opt, /usr, /emul,
39 /usr/sbin/anacron, /bin/d?ash, /bin/ksh.*, /bin/zsh.*, /usr/bin/d?ash,
40 /usr/bin/ksh.*, /usr/bin/zsh.*, /bin/esh, /bin/bash, /bin/fish,
41 /bin/mksh, /bin/sash, /bin/tcsh, /bin/yash, /bin/bash2, /usr/bin/esh,
42 /sbin/nologin, /usr/bin/bash, /usr/bin/fish, /usr/bin/mksh,
43 /usr/bin/sash, /usr/bin/tcsh, /usr/bin/yash, /usr/bin/bash2,
44 /usr/sbin/sesh, /usr/sbin/smrsh, /usr/bin/scponly, /usr/libexec/sesh,
45 /usr/sbin/nologin, /usr/bin/git-shell, /usr/sbin/scponlyc,
46 /usr/libexec/sudo/sesh, /usr/bin/cockpit-bridge, /usr/libexec/cockpit-
47 agent, /usr/libexec/git-core/git-shell, /var/run/user/[0-9]+/gvfs
48
50 SELinux defines process types (domains) for each process running on the
51 system
52 You can see the context of a process using the -Z option to ps
54 Policy governs the access confined processes have to files. SELinux
56 system_cronjob policy is very flexible allowing users to setup their
57 system_cronjob processes in as secure a method as possible.
58 The following process types are defined for system_cronjob:
60 system_cronjob_t
62 Note: semanage permissive -a system_cronjob_t can be used to make the
64 process type system_cronjob_t permissive. SELinux does not deny access
65 to permissive process types, but the AVC (SELinux denials) messages are
66 still generated.
67
70 SELinux policy is customizable based on least access required. sys‐
71 tem_cronjob policy is extremely flexible and has several booleans that
72 allow you to manipulate the policy and run system_cronjob with the
73 tightest access possible.
74 If you want to allow system cron jobs to relabel filesystem for restor‐
78 ing file contexts, you must turn on the cron_can_relabel boolean. Dis‐
79 abled by default.
80 setsebool -P cron_can_relabel 1
82 If you want to allow system cronjob to be executed on on NFS, CIFS or
86 FUSE filesystem, you must turn on the cron_system_cronjob_use_shares
87 boolean. Disabled by default.
88 setsebool -P cron_system_cronjob_use_shares 1
90 If you want to deny user domains applications to map a memory region as
94 both executable and writable, this is dangerous and the executable
95 should be reported in bugzilla, you must turn on the deny_execmem bool‐
96 ean. Enabled by default.
97 setsebool -P deny_execmem 1
99 If you want to control the ability to mmap a low area of the address
103 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
104 the mmap_low_allowed boolean. Disabled by default.
105 setsebool -P mmap_low_allowed 1
107 If you want to disable kernel module loading, you must turn on the se‐
111 cure_mode_insmod boolean. Enabled by default.
112 setsebool -P secure_mode_insmod 1
114 If you want to allow unconfined executables to make their heap memory
118 executable. Doing this is a really bad idea. Probably indicates a
119 badly coded executable, but could indicate an attack. This executable
120 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
121 echeap boolean. Disabled by default.
122 setsebool -P selinuxuser_execheap 1
124 If you want to allow unconfined executables to make their stack exe‐
128 cutable. This should never, ever be necessary. Probably indicates a
129 badly coded executable, but could indicate an attack. This executable
130 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
131 stack boolean. Enabled by default.
132 setsebool -P selinuxuser_execstack 1
134
138 The SELinux process type system_cronjob_t can manage files labeled with
139 the following file types. The paths listed are the default paths for
140 these file types. Note the processes UID still need to have DAC per‐
141 missions.
142 file_type
144 all files on the system
146
149 semanage fcontext can also be used to manipulate default file context
150 mappings.
151 semanage permissive can also be used to manipulate whether or not a
153 process type is permissive.
154 semanage module can also be used to enable/disable/install/remove pol‐
156 icy modules.
157 semanage boolean can also be used to manipulate the booleans
159 system-config-selinux is a GUI tool available to customize SELinux pol‐
162 icy settings.
163
166 This manual page was auto-generated using sepolicy manpage .
167
170 selinux(8), system_cronjob(8), semanage(8), restorecon(8), chcon(1),
171 sepolicy(8), setsebool(8)
172system_cronjob 23-02-03 system_cronjob_selinux(8)