1dhcpd_selinux(8) SELinux Policy dhcpd dhcpd_selinux(8)
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6 dhcpd_selinux - Security Enhanced Linux Policy for the dhcpd processes
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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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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.*, /usr/sbin/dhcrelay.*
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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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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 allow all daemons to write corefiles to /, you must turn
57 on the allow_daemons_dump_core boolean. Disabled by default.
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59 setsebool -P allow_daemons_dump_core 1
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63 If you want to allow all daemons to use tcp wrappers, you must turn on
64 the allow_daemons_use_tcp_wrapper boolean. Disabled by default.
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66 setsebool -P allow_daemons_use_tcp_wrapper 1
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70 If you want to allow all daemons the ability to read/write terminals,
71 you must turn on the allow_daemons_use_tty boolean. Disabled by
72 default.
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74 setsebool -P allow_daemons_use_tty 1
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78 If you want to allow all domains to use other domains file descriptors,
79 you must turn on the allow_domain_fd_use boolean. Enabled by default.
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81 setsebool -P allow_domain_fd_use 1
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85 If you want to allow confined applications to run with kerberos, you
86 must turn on the allow_kerberos boolean. Enabled by default.
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88 setsebool -P allow_kerberos 1
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92 If you want to allow sysadm to debug or ptrace all processes, you must
93 turn on the allow_ptrace boolean. Disabled by default.
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95 setsebool -P allow_ptrace 1
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99 If you want to allow system to run with NIS, you must turn on the
100 allow_ypbind boolean. Disabled by default.
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102 setsebool -P allow_ypbind 1
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106 If you want to enable cluster mode for daemons, you must turn on the
107 daemons_enable_cluster_mode boolean. Disabled by default.
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109 setsebool -P daemons_enable_cluster_mode 1
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113 If you want to allow all domains to have the kernel load modules, you
114 must turn on the domain_kernel_load_modules boolean. Disabled by
115 default.
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117 setsebool -P domain_kernel_load_modules 1
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121 If you want to allow all domains to execute in fips_mode, you must turn
122 on the fips_mode boolean. Enabled by default.
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124 setsebool -P fips_mode 1
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128 If you want to enable reading of urandom for all domains, you must turn
129 on the global_ssp boolean. Disabled by default.
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131 setsebool -P global_ssp 1
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135 If you want to enable support for upstart as the init program, you must
136 turn on the init_upstart boolean. Enabled by default.
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138 setsebool -P init_upstart 1
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142 If you want to allow confined applications to use nscd shared memory,
143 you must turn on the nscd_use_shm boolean. Enabled by default.
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145 setsebool -P nscd_use_shm 1
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150 SELinux defines port types to represent TCP and UDP ports.
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152 You can see the types associated with a port by using the following
153 command:
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155 semanage port -l
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158 Policy governs the access confined processes have to these ports.
159 SELinux dhcpd policy is very flexible allowing users to setup their
160 dhcpd processes in as secure a method as possible.
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162 The following port types are defined for dhcpd:
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165 dhcpd_port_t
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169 Default Defined Ports:
170 tcp 547,548,647,847,7911
171 udp 67,547,548,647,847
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174 The SELinux process type dhcpd_t can manage files labeled with the fol‐
175 lowing file types. The paths listed are the default paths for these
176 file types. Note the processes UID still need to have DAC permissions.
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178 cluster_conf_t
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180 /etc/cluster(/.*)?
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182 cluster_var_lib_t
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184 /var/lib(64)?/openais(/.*)?
185 /var/lib(64)?/pengine(/.*)?
186 /var/lib(64)?/corosync(/.*)?
187 /usr/lib(64)?/heartbeat(/.*)?
188 /var/lib(64)?/heartbeat(/.*)?
189 /var/lib(64)?/pacemaker(/.*)?
190 /var/lib/cluster(/.*)?
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192 cluster_var_run_t
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194 /var/run/crm(/.*)?
195 /var/run/cman_.*
196 /var/run/rsctmp(/.*)?
197 /var/run/aisexec.*
198 /var/run/heartbeat(/.*)?
199 /var/run/cpglockd.pid
200 /var/run/corosync.pid
201 /var/run/rgmanager.pid
202 /var/run/cluster/rgmanager.sk
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204 dhcpd_state_t
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206 /var/lib/dhcp(3)?/dhcpd.leases.*
207 /var/lib/dhcpd(/.*)?
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209 dhcpd_tmp_t
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212 dhcpd_var_run_t
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214 /var/run/dhcpd.pid
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216 initrc_tmp_t
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219 mnt_t
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221 /mnt(/[^/]*)
222 /mnt(/[^/]*)?
223 /rhev(/[^/]*)?
224 /media(/[^/]*)
225 /media(/[^/]*)?
226 /etc/rhgb(/.*)?
227 /media/.hal-.*
228 /net
229 /afs
230 /rhev
231 /misc
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233 root_t
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235 /
236 /initrd
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238 tmp_t
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240 /tmp
241 /usr/tmp
242 /var/tmp
243 /tmp-inst
244 /var/tmp-inst
245 /var/tmp/vi.recover
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249 SELinux requires files to have an extended attribute to define the file
250 type.
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252 You can see the context of a file using the -Z option to ls
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254 Policy governs the access confined processes have to these files.
255 SELinux dhcpd policy is very flexible allowing users to setup their
256 dhcpd processes in as secure a method as possible.
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258 STANDARD FILE CONTEXT
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260 SELinux defines the file context types for the dhcpd, if you wanted to
261 store files with these types in a diffent paths, you need to execute
262 the semanage command to sepecify alternate labeling and then use
263 restorecon to put the labels on disk.
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265 semanage fcontext -a -t dhcpd_var_run_t '/srv/mydhcpd_content(/.*)?'
266 restorecon -R -v /srv/mydhcpd_content
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268 Note: SELinux often uses regular expressions to specify labels that
269 match multiple files.
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271 The following file types are defined for dhcpd:
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275 dhcpd_exec_t
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277 - Set files with the dhcpd_exec_t type, if you want to transition an
278 executable to the dhcpd_t domain.
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281 Paths:
282 /usr/sbin/dhcpd.*, /usr/sbin/dhcrelay.*
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285 dhcpd_initrc_exec_t
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287 - Set files with the dhcpd_initrc_exec_t type, if you want to transi‐
288 tion an executable to the dhcpd_initrc_t domain.
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291 Paths:
292 /etc/rc.d/init.d/dhcpd(6)?, /etc/rc.d/init.d/dhcrelay(6)?
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295 dhcpd_state_t
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297 - Set files with the dhcpd_state_t type, if you want to treat the files
298 as dhcpd state data.
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301 Paths:
302 /var/lib/dhcp(3)?/dhcpd.leases.*, /var/lib/dhcpd(/.*)?
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305 dhcpd_tmp_t
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307 - Set files with the dhcpd_tmp_t type, if you want to store dhcpd tem‐
308 porary files in the /tmp directories.
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312 dhcpd_var_run_t
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314 - Set files with the dhcpd_var_run_t type, if you want to store the
315 dhcpd files under the /run or /var/run directory.
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319 Note: File context can be temporarily modified with the chcon command.
320 If you want to permanently change the file context you need to use the
321 semanage fcontext command. This will modify the SELinux labeling data‐
322 base. You will need to use restorecon to apply the labels.
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326 semanage fcontext can also be used to manipulate default file context
327 mappings.
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329 semanage permissive can also be used to manipulate whether or not a
330 process type is permissive.
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332 semanage module can also be used to enable/disable/install/remove pol‐
333 icy modules.
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335 semanage port can also be used to manipulate the port definitions
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337 semanage boolean can also be used to manipulate the booleans
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340 system-config-selinux is a GUI tool available to customize SELinux pol‐
341 icy settings.
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345 This manual page was auto-generated using sepolicy manpage .
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349 selinux(8), dhcpd(8), semanage(8), restorecon(8), chcon(1) , setse‐
350 bool(8)
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354dhcpd 15-06-03 dhcpd_selinux(8)