dhcpd_selinux(8)

1dhcpd_selinux(8)             SELinux Policy dhcpd             dhcpd_selinux(8)
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NAME

6       dhcpd_selinux - Security Enhanced Linux Policy for the dhcpd processes
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DESCRIPTION

9       Security-Enhanced Linux secures the dhcpd processes via flexible manda‐
10       tory access control.
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12       The dhcpd processes execute with the  dhcpd_t  SELinux  type.  You  can
13       check  if  you have these processes running by executing the ps command
14       with the -Z qualifier.
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16       For example:
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18       ps -eZ | grep dhcpd_t
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ENTRYPOINTS

23       The dhcpd_t SELinux type can be entered via the dhcpd_exec_t file type.
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25       The default entrypoint paths for the dhcpd_t domain are the following:
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27       /usr/sbin/dhcpd(6)?, /usr/sbin/dhcrelay(6)?
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PROCESS TYPES

30       SELinux defines process types (domains) for each process running on the
31       system
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33       You can see the context of a process using the -Z option to ps
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35       Policy  governs  the  access confined processes have to files.  SELinux
36       dhcpd policy is very flexible allowing users to setup their dhcpd  pro‐
37       cesses in as secure a method as possible.
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39       The following process types are defined for dhcpd:
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41       dhcpd_t
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43       Note:  semanage  permissive  -a dhcpd_t can be used to make the process
44       type dhcpd_t permissive. SELinux does not  deny  access  to  permissive
45       process  types, but the AVC (SELinux denials) messages are still gener‐
46       ated.
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BOOLEANS

50       SELinux policy is customizable based on least access  required.   dhcpd
51       policy is extremely flexible and has several booleans that allow you to
52       manipulate the policy and run dhcpd with the tightest access possible.
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56       If you want to determine whether DHCP daemon can use LDAP backends, you
57       must turn on the dhcpd_use_ldap boolean. Disabled by default.
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59       setsebool -P dhcpd_use_ldap 1
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63       If you want to allow users to resolve user passwd entries directly from
64       ldap rather then using a sssd server, you  must  turn  on  the  authlo‐
65       gin_nsswitch_use_ldap boolean. Disabled by default.
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67       setsebool -P authlogin_nsswitch_use_ldap 1
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71       If you want to allow all daemons to write corefiles to /, you must turn
72       on the daemons_dump_core boolean. Disabled by default.
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74       setsebool -P daemons_dump_core 1
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78       If you want to enable cluster mode for daemons, you must  turn  on  the
79       daemons_enable_cluster_mode boolean. Enabled by default.
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81       setsebool -P daemons_enable_cluster_mode 1
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85       If  you want to allow all daemons to use tcp wrappers, you must turn on
86       the daemons_use_tcp_wrapper boolean. Disabled by default.
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88       setsebool -P daemons_use_tcp_wrapper 1
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92       If you want to allow all daemons the ability to  read/write  terminals,
93       you must turn on the daemons_use_tty boolean. Disabled by default.
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95       setsebool -P daemons_use_tty 1
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99       If  you  want  to deny any process from ptracing or debugging any other
100       processes, you  must  turn  on  the  deny_ptrace  boolean.  Enabled  by
101       default.
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103       setsebool -P deny_ptrace 1
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107       If  you  want  to  allow  any  process  to mmap any file on system with
108       attribute file_type, you must turn on the  domain_can_mmap_files  bool‐
109       ean. Enabled by default.
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111       setsebool -P domain_can_mmap_files 1
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115       If  you want to allow all domains write to kmsg_device, while kernel is
116       executed with systemd.log_target=kmsg parameter, you must turn  on  the
117       domain_can_write_kmsg boolean. Disabled by default.
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119       setsebool -P domain_can_write_kmsg 1
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123       If you want to allow all domains to use other domains file descriptors,
124       you must turn on the domain_fd_use boolean. Enabled by default.
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126       setsebool -P domain_fd_use 1
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130       If you want to allow all domains to have the kernel load  modules,  you
131       must  turn  on  the  domain_kernel_load_modules  boolean.  Disabled  by
132       default.
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134       setsebool -P domain_kernel_load_modules 1
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138       If you want to allow all domains to execute in fips_mode, you must turn
139       on the fips_mode boolean. Enabled by default.
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141       setsebool -P fips_mode 1
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145       If you want to enable reading of urandom for all domains, you must turn
146       on the global_ssp boolean. Disabled by default.
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148       setsebool -P global_ssp 1
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152       If you want to allow confined applications to run  with  kerberos,  you
153       must turn on the kerberos_enabled boolean. Enabled by default.
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155       setsebool -P kerberos_enabled 1
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159       If  you  want  to  allow  system  to run with NIS, you must turn on the
160       nis_enabled boolean. Disabled by default.
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162       setsebool -P nis_enabled 1
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166       If you want to allow confined applications to use nscd  shared  memory,
167       you must turn on the nscd_use_shm boolean. Disabled by default.
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169       setsebool -P nscd_use_shm 1
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PORT TYPES

174       SELinux defines port types to represent TCP and UDP ports.
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176       You  can  see  the  types associated with a port by using the following
177       command:
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179       semanage port -l
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182       Policy governs the access  confined  processes  have  to  these  ports.
183       SELinux  dhcpd  policy  is  very flexible allowing users to setup their
184       dhcpd processes in as secure a method as possible.
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186       The following port types are defined for dhcpd:
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188
189       dhcpd_port_t
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193       Default Defined Ports:
194                 tcp 547,548,647,847,7911
195                 udp 67,547,548,647,847
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MANAGED FILES

198       The SELinux process type dhcpd_t can manage files labeled with the fol‐
199       lowing  file  types.   The paths listed are the default paths for these
200       file types.  Note the processes UID still need to have DAC permissions.
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202       cluster_conf_t
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204            /etc/cluster(/.*)?
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206       cluster_var_lib_t
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208            /var/lib/pcsd(/.*)?
209            /var/lib/cluster(/.*)?
210            /var/lib/openais(/.*)?
211            /var/lib/pengine(/.*)?
212            /var/lib/corosync(/.*)?
213            /usr/lib/heartbeat(/.*)?
214            /var/lib/heartbeat(/.*)?
215            /var/lib/pacemaker(/.*)?
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217       cluster_var_run_t
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219            /var/run/crm(/.*)?
220            /var/run/cman_.*
221            /var/run/rsctmp(/.*)?
222            /var/run/aisexec.*
223            /var/run/heartbeat(/.*)?
224            /var/run/corosync-qnetd(/.*)?
225            /var/run/corosync-qdevice(/.*)?
226            /var/run/cpglockd.pid
227            /var/run/corosync.pid
228            /var/run/rgmanager.pid
229            /var/run/cluster/rgmanager.sk
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231       dhcpd_state_t
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233            /var/lib/dhcp(3)?/dhcpd.leases.*
234            /var/lib/dhcpd(/.*)?
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236       dhcpd_tmp_t
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239       dhcpd_var_run_t
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241            /var/run/dhcpd(6)?.pid
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243       root_t
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245            /sysroot/ostree/deploy/.*-atomic.*/deploy(/.*)?
246            /
247            /initrd
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FILE CONTEXTS

251       SELinux requires files to have an extended attribute to define the file
252       type.
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254       You can see the context of a file using the -Z option to ls
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256       Policy  governs  the  access  confined  processes  have to these files.
257       SELinux dhcpd policy is very flexible allowing  users  to  setup  their
258       dhcpd processes in as secure a method as possible.
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260       STANDARD FILE CONTEXT
261
262       SELinux  defines the file context types for the dhcpd, if you wanted to
263       store files with these types in a diffent paths, you  need  to  execute
264       the  semanage  command  to  sepecify  alternate  labeling  and then use
265       restorecon to put the labels on disk.
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267       semanage fcontext -a -t dhcpd_var_run_t '/srv/mydhcpd_content(/.*)?'
268       restorecon -R -v /srv/mydhcpd_content
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270       Note: SELinux often uses regular expressions  to  specify  labels  that
271       match multiple files.
272
273       The following file types are defined for dhcpd:
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277       dhcpd_exec_t
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279       -  Set  files  with the dhcpd_exec_t type, if you want to transition an
280       executable to the dhcpd_t domain.
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283       Paths:
284            /usr/sbin/dhcpd(6)?, /usr/sbin/dhcrelay(6)?
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287       dhcpd_initrc_exec_t
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289       - Set files with the dhcpd_initrc_exec_t type, if you want  to  transi‐
290       tion an executable to the dhcpd_initrc_t domain.
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293       Paths:
294            /etc/rc.d/init.d/dhcpd(6)?, /etc/rc.d/init.d/dhcrelay(6)?
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297       dhcpd_state_t
298
299       - Set files with the dhcpd_state_t type, if you want to treat the files
300       as dhcpd state data.
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303       Paths:
304            /var/lib/dhcp(3)?/dhcpd.leases.*, /var/lib/dhcpd(/.*)?
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307       dhcpd_tmp_t
308
309       - Set files with the dhcpd_tmp_t type, if you want to store dhcpd  tem‐
310       porary files in the /tmp directories.
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314       dhcpd_unit_file_t
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316       -  Set  files with the dhcpd_unit_file_t type, if you want to treat the
317       files as dhcpd unit content.
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320       Paths:
321            /usr/lib/systemd/system/dhcpd.*, /usr/lib/systemd/system/dhcpcd.*,
322            /usr/lib/systemd/system/dhcpd6.*,   /usr/lib/systemd/system/dhcre‐
323            lay.*
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326       dhcpd_var_run_t
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328       - Set files with the dhcpd_var_run_t type, if you  want  to  store  the
329       dhcpd files under the /run or /var/run directory.
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333       Note:  File context can be temporarily modified with the chcon command.
334       If you want to permanently change the file context you need to use  the
335       semanage fcontext command.  This will modify the SELinux labeling data‐
336       base.  You will need to use restorecon to apply the labels.
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COMMANDS

340       semanage fcontext can also be used to manipulate default  file  context
341       mappings.
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343       semanage  permissive  can  also  be used to manipulate whether or not a
344       process type is permissive.
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346       semanage module can also be used to enable/disable/install/remove  pol‐
347       icy modules.
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349       semanage port can also be used to manipulate the port definitions
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351       semanage boolean can also be used to manipulate the booleans
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353
354       system-config-selinux is a GUI tool available to customize SELinux pol‐
355       icy settings.
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AUTHOR

359       This manual page was auto-generated using sepolicy manpage .
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