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 shell_exec_t,
25 system_cron_spool_t, bin_t, anacron_exec_t, usr_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. /bin/d?ash, /bin/ksh.*, /bin/zsh.*,
33 /usr/bin/d?ash, /usr/bin/ksh.*, /usr/bin/zsh.*, /bin/esh, /bin/bash,
34 /bin/fish, /bin/mksh, /bin/sash, /bin/tcsh, /bin/yash, /bin/bash2,
35 /usr/bin/esh, /sbin/nologin, /usr/bin/bash, /usr/bin/fish,
36 /usr/bin/mksh, /usr/bin/sash, /usr/bin/tcsh, /usr/bin/yash,
37 /usr/bin/bash2, /usr/sbin/sesh, /usr/sbin/smrsh, /usr/bin/scponly,
38 /usr/libexec/sesh, /usr/sbin/nologin, /usr/bin/git-shell,
39 /usr/sbin/scponlyc, /usr/libexec/sudo/sesh, /usr/bin/cockpit-bridge,
40 /usr/libexec/cockpit-agent, /usr/libexec/git-core/git-shell,
41 /etc/cron.d(/.*)?, /var/spool/anacron(/.*)?, /etc/crontab,
42 /var/spool/fcron/systab, /var/spool/fcron/new.systab,
43 /var/spool/fcron/systab.orig, /usr/sbin/anacron, /opt/.*, /usr/.*,
44 /emul/.*, /export(/.*)?, /ostree(/.*)?, /usr/doc(/.*)?/lib(/.*)?,
45 /usr/inclu.e(/.*)?, /usr/share/rpm(/.*)?,
46 /usr/share/doc(/.*)?/README.*, /usr/lib/modules(/.*)/vmlinuz,
47 /usr/lib/modules(/.*)/initramfs.img, /usr/lib/sysimage(/.*)?,
48 /usr/lib/ostree-boot(/.*)?, /opt, /usr, /emul,
49 /var/run/user/[0-9]+/gvfs
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52 SELinux defines process types (domains) for each process running on the
53 system
54 You can see the context of a process using the -Z option to ps
56 Policy governs the access confined processes have to files. SELinux
58 system_cronjob policy is very flexible allowing users to setup their
59 system_cronjob processes in as secure a method as possible.
60 The following process types are defined for system_cronjob:
62 system_cronjob_t
64 Note: semanage permissive -a system_cronjob_t can be used to make the
66 process type system_cronjob_t permissive. SELinux does not deny access
67 to permissive process types, but the AVC (SELinux denials) messages are
68 still generated.
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72 SELinux policy is customizable based on least access required. sys‐
73 tem_cronjob policy is extremely flexible and has several booleans that
74 allow you to manipulate the policy and run system_cronjob with the
75 tightest access possible.
76 If you want to allow system cron jobs to relabel filesystem for restor‐
80 ing file contexts, you must turn on the cron_can_relabel boolean. Dis‐
81 abled by default.
82 setsebool -P cron_can_relabel 1
84 If you want to allow system cronjob to be executed on on NFS, CIFS or
88 FUSE filesystem, you must turn on the cron_system_cronjob_use_shares
89 boolean. Disabled by default.
90 setsebool -P cron_system_cronjob_use_shares 1
92 If you want to deny user domains applications to map a memory region as
96 both executable and writable, this is dangerous and the executable
97 should be reported in bugzilla, you must turn on the deny_execmem bool‐
98 ean. Enabled by default.
99 setsebool -P deny_execmem 1
101 If you want to control the ability to mmap a low area of the address
105 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
106 the mmap_low_allowed boolean. Disabled by default.
107 setsebool -P mmap_low_allowed 1
109 If you want to disable kernel module loading, you must turn on the se‐
113 cure_mode_insmod boolean. Enabled by default.
114 setsebool -P secure_mode_insmod 1
116 If you want to allow unconfined executables to make their heap memory
120 executable. Doing this is a really bad idea. Probably indicates a
121 badly coded executable, but could indicate an attack. This executable
122 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
123 echeap boolean. Disabled by default.
124 setsebool -P selinuxuser_execheap 1
126 If you want to allow unconfined executables to make their stack exe‐
130 cutable. This should never, ever be necessary. Probably indicates a
131 badly coded executable, but could indicate an attack. This executable
132 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
133 stack boolean. Enabled by default.
134 setsebool -P selinuxuser_execstack 1
136
140 The SELinux process type system_cronjob_t can manage files labeled with
141 the following file types. The paths listed are the default paths for
142 these file types. Note the processes UID still need to have DAC per‐
143 missions.
144 file_type
146 all files on the system
148
151 semanage fcontext can also be used to manipulate default file context
152 mappings.
153 semanage permissive can also be used to manipulate whether or not a
155 process type is permissive.
156 semanage module can also be used to enable/disable/install/remove pol‐
158 icy modules.
159 semanage boolean can also be used to manipulate the booleans
161 system-config-selinux is a GUI tool available to customize SELinux pol‐
164 icy settings.
165
168 This manual page was auto-generated using sepolicy manpage .
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172 selinux(8), system_cronjob(8), semanage(8), restorecon(8), chcon(1),
173 sepolicy(8), setsebool(8)
174system_cronjob 22-05-27 system_cronjob_selinux(8)