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 domains to execute in fips_mode, you must turn
72       on the fips_mode boolean. Enabled by default.
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74       setsebool -P fips_mode 1
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78       If you want to allow confined applications to run  with  kerberos,  you
79       must turn on the kerberos_enabled boolean. Enabled by default.
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81       setsebool -P kerberos_enabled 1
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85       If  you  want  to  allow  system  to run with NIS, you must turn on the
86       nis_enabled boolean. Disabled by default.
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88       setsebool -P nis_enabled 1
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92       If you want to allow confined applications to use nscd  shared  memory,
93       you must turn on the nscd_use_shm boolean. Disabled by default.
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95       setsebool -P nscd_use_shm 1
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PORT TYPES

100       SELinux defines port types to represent TCP and UDP ports.
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102       You  can  see  the  types associated with a port by using the following
103       command:
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105       semanage port -l
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108       Policy governs the access  confined  processes  have  to  these  ports.
109       SELinux  dhcpd  policy  is  very flexible allowing users to setup their
110       dhcpd processes in as secure a method as possible.
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112       The following port types are defined for dhcpd:
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114
115       dhcpd_port_t
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119       Default Defined Ports:
120                 tcp 547,548,647,847,7911
121                 udp 67,547,548,647,847
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MANAGED FILES

124       The SELinux process type dhcpd_t can manage files labeled with the fol‐
125       lowing  file  types.   The paths listed are the default paths for these
126       file types.  Note the processes UID still need to have DAC permissions.
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128       cluster_conf_t
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130            /etc/cluster(/.*)?
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132       cluster_var_lib_t
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134            /var/lib/pcsd(/.*)?
135            /var/lib/cluster(/.*)?
136            /var/lib/openais(/.*)?
137            /var/lib/pengine(/.*)?
138            /var/lib/corosync(/.*)?
139            /usr/lib/heartbeat(/.*)?
140            /var/lib/heartbeat(/.*)?
141            /var/lib/pacemaker(/.*)?
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143       cluster_var_run_t
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145            /var/run/crm(/.*)?
146            /var/run/cman_.*
147            /var/run/rsctmp(/.*)?
148            /var/run/aisexec.*
149            /var/run/heartbeat(/.*)?
150            /var/run/corosync-qnetd(/.*)?
151            /var/run/corosync-qdevice(/.*)?
152            /var/run/corosync.pid
153            /var/run/cpglockd.pid
154            /var/run/rgmanager.pid
155            /var/run/cluster/rgmanager.sk
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157       dhcpd_state_t
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159            /var/lib/dhcp(3)?/dhcpd.leases.*
160            /var/lib/dhcpd(/.*)?
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162       dhcpd_tmp_t
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165       dhcpd_var_run_t
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167            /var/run/dhcpd(6)?.pid
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169       root_t
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171            /sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
172            /
173            /initrd
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FILE CONTEXTS

177       SELinux requires files to have an extended attribute to define the file
178       type.
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180       You can see the context of a file using the -Z option to ls
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182       Policy  governs  the  access  confined  processes  have to these files.
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       STANDARD FILE CONTEXT
187
188       SELinux  defines the file context types for the dhcpd, if you wanted to
189       store files with these types in a diffent paths, you  need  to  execute
190       the  semanage  command  to  sepecify  alternate  labeling  and then use
191       restorecon to put the labels on disk.
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193       semanage fcontext -a -t dhcpd_var_run_t '/srv/mydhcpd_content(/.*)?'
194       restorecon -R -v /srv/mydhcpd_content
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196       Note: SELinux often uses regular expressions  to  specify  labels  that
197       match multiple files.
198
199       The following file types are defined for dhcpd:
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203       dhcpd_exec_t
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205       -  Set  files  with the dhcpd_exec_t type, if you want to transition an
206       executable to the dhcpd_t domain.
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209       Paths:
210            /usr/sbin/dhcpd(6)?, /usr/sbin/dhcrelay(6)?
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212
213       dhcpd_initrc_exec_t
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215       - Set files with the dhcpd_initrc_exec_t type, if you want  to  transi‐
216       tion an executable to the dhcpd_initrc_t domain.
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219       Paths:
220            /etc/rc.d/init.d/dhcpd(6)?, /etc/rc.d/init.d/dhcrelay(6)?
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223       dhcpd_state_t
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225       - Set files with the dhcpd_state_t type, if you want to treat the files
226       as dhcpd state data.
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229       Paths:
230            /var/lib/dhcp(3)?/dhcpd.leases.*, /var/lib/dhcpd(/.*)?
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233       dhcpd_tmp_t
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235       - Set files with the dhcpd_tmp_t type, if you want to store dhcpd  tem‐
236       porary files in the /tmp directories.
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240       dhcpd_unit_file_t
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242       -  Set  files with the dhcpd_unit_file_t type, if you want to treat the
243       files as dhcpd unit content.
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246       Paths:
247            /usr/lib/systemd/system/dhcpd.*, /usr/lib/systemd/system/dhcpcd.*,
248            /usr/lib/systemd/system/dhcpd6.*,   /usr/lib/systemd/system/dhcre‐
249            lay.*
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252       dhcpd_var_run_t
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254       - Set files with the dhcpd_var_run_t type, if you  want  to  store  the
255       dhcpd files under the /run or /var/run directory.
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259       Note:  File context can be temporarily modified with the chcon command.
260       If you want to permanently change the file context you need to use  the
261       semanage fcontext command.  This will modify the SELinux labeling data‐
262       base.  You will need to use restorecon to apply the labels.
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COMMANDS

266       semanage fcontext can also be used to manipulate default  file  context
267       mappings.
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269       semanage  permissive  can  also  be used to manipulate whether or not a
270       process type is permissive.
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272       semanage module can also be used to enable/disable/install/remove  pol‐
273       icy modules.
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275       semanage port can also be used to manipulate the port definitions
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277       semanage boolean can also be used to manipulate the booleans
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280       system-config-selinux is a GUI tool available to customize SELinux pol‐
281       icy settings.
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AUTHOR

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