1system_cronjob_selinux(8)SELinux Policy system_cronjobsystem_cronjob_selinux(8)
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6 system_cronjob_selinux - Security Enhanced Linux Policy for the sys‐
7 tem_cronjob processes
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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
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24 The system_cronjob_t SELinux type can be entered via the usr_t, bin_t,
25 anacron_exec_t, system_cron_spool_t, shell_exec_t, fusefs_t, nfs_t,
26 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. /opt/.*, /usr/.*, /emul/.*, /export(/.*)?,
33 /ostree(/.*)?, /usr/doc(/.*)?/lib(/.*)?, /usr/inclu.e(/.*)?,
34 /usr/share/rpm(/.*)?, /usr/share/doc(/.*)?/README.*, /usr/lib/mod‐
35 ules(/.*)/vmlinuz, /usr/lib/modules(/.*)/initramfs.img, /usr/lib/sysim‐
36 age(/.*)?, /usr/lib/ostree-boot(/.*)?, /opt, /usr, /emul,
37 /usr/sbin/anacron, /etc/cron.d(/.*)?, /var/spool/anacron(/.*)?,
38 /etc/crontab, /var/spool/fcron/systab, /var/spool/fcron/new.systab,
39 /var/spool/fcron/systab.orig, /bin/d?ash, /bin/ksh.*, /bin/zsh.*,
40 /usr/bin/d?ash, /usr/bin/ksh.*, /usr/bin/zsh.*, /bin/esh, /bin/bash,
41 /bin/fish, /bin/mksh, /bin/sash, /bin/tcsh, /bin/yash, /bin/bash2,
42 /usr/bin/esh, /sbin/nologin, /usr/bin/bash, /usr/bin/fish,
43 /usr/bin/mksh, /usr/bin/sash, /usr/bin/tcsh, /usr/bin/yash,
44 /usr/bin/bash2, /usr/sbin/sesh, /usr/sbin/smrsh, /usr/bin/scponly,
45 /usr/libexec/sesh, /usr/sbin/nologin, /usr/bin/git-shell,
46 /usr/sbin/scponlyc, /usr/libexec/sudo/sesh, /usr/bin/cockpit-bridge,
47 /usr/libexec/cockpit-agent, /usr/libexec/git-core/git-shell,
48 /var/run/user/[^/]*/gvfs
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51 SELinux defines process types (domains) for each process running on the
52 system
53 You can see the context of a process using the -Z option to ps
55 Policy governs the access confined processes have to files. SELinux
57 system_cronjob policy is very flexible allowing users to setup their
58 system_cronjob processes in as secure a method as possible.
59 The following process types are defined for system_cronjob:
61 system_cronjob_t
63 Note: semanage permissive -a system_cronjob_t can be used to make the
65 process type system_cronjob_t permissive. SELinux does not deny access
66 to permissive process types, but the AVC (SELinux denials) messages are
67 still generated.
68
71 SELinux policy is customizable based on least access required. sys‐
72 tem_cronjob policy is extremely flexible and has several booleans that
73 allow you to manipulate the policy and run system_cronjob with the
74 tightest access possible.
75 If you want to allow system cron jobs to relabel filesystem for restor‐
79 ing file contexts, you must turn on the cron_can_relabel boolean. Dis‐
80 abled by default.
81 setsebool -P cron_can_relabel 1
83 If you want to allow system cronjob to be executed on on NFS, CIFS or
87 FUSE filesystem, you must turn on the cron_system_cronjob_use_shares
88 boolean. Disabled by default.
89 setsebool -P cron_system_cronjob_use_shares 1
91 If you want to deny user domains applications to map a memory region as
95 both executable and writable, this is dangerous and the executable
96 should be reported in bugzilla, you must turn on the deny_execmem bool‐
97 ean. Enabled by default.
98 setsebool -P deny_execmem 1
100 If you want to control the ability to mmap a low area of the address
104 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
105 the mmap_low_allowed boolean. Disabled by default.
106 setsebool -P mmap_low_allowed 1
108 If you want to disable kernel module loading, you must turn on the
112 secure_mode_insmod boolean. Enabled by default.
113 setsebool -P secure_mode_insmod 1
115 If you want to allow unconfined executables to make their heap memory
119 executable. Doing this is a really bad idea. Probably indicates a
120 badly coded executable, but could indicate an attack. This executable
121 should be reported in bugzilla, you must turn on the selin‐
122 uxuser_execheap boolean. Disabled by default.
123 setsebool -P selinuxuser_execheap 1
125 If you want to allow unconfined executables to make their stack exe‐
129 cutable. This should never, ever be necessary. Probably indicates a
130 badly coded executable, but could indicate an attack. This executable
131 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
132 stack boolean. Disabled by default.
133 setsebool -P selinuxuser_execstack 1
135
139 The SELinux process type system_cronjob_t can manage files labeled with
140 the following file types. The paths listed are the default paths for
141 these file types. Note the processes UID still need to have DAC per‐
142 missions.
143 file_type
145 all files on the system
147
150 semanage fcontext can also be used to manipulate default file context
151 mappings.
152 semanage permissive can also be used to manipulate whether or not a
154 process type is permissive.
155 semanage module can also be used to enable/disable/install/remove pol‐
157 icy modules.
158 semanage boolean can also be used to manipulate the booleans
160 system-config-selinux is a GUI tool available to customize SELinux pol‐
163 icy settings.
164
167 This manual page was auto-generated using sepolicy manpage .
168
171 selinux(8), system_cronjob(8), semanage(8), restorecon(8), chcon(1),
172 sepolicy(8), setsebool(8)
173system_cronjob 20-05-05 system_cronjob_selinux(8)