1dhcpd_selinux(8) SELinux Policy dhcpd dhcpd_selinux(8)
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6 dhcpd_selinux - Security Enhanced Linux Policy for the dhcpd processes
7
9 Security-Enhanced Linux secures the dhcpd processes via flexible manda‐
10 tory access control.
11 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.
15 For example:
17 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.
24 The default entrypoint paths for the dhcpd_t domain are the following:
26 /usr/sbin/dhcpd(6)?, /usr/sbin/dhcrelay(6)?
28
30 SELinux defines process types (domains) for each process running on the
31 system
32 You can see the context of a process using the -Z option to ps
34 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.
38 The following process types are defined for dhcpd:
40 dhcpd_t
42 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.
47
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.
53 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.
58 setsebool -P dhcpd_use_ldap 1
60 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.
66 setsebool -P authlogin_nsswitch_use_ldap 1
68 If you want to allow all domains to execute in fips_mode, you must turn
72 on the fips_mode boolean. Enabled by default.
73 setsebool -P fips_mode 1
75 If you want to allow confined applications to run with kerberos, you
79 must turn on the kerberos_enabled boolean. Enabled by default.
80 setsebool -P kerberos_enabled 1
82 If you want to allow system to run with NIS, you must turn on the
86 nis_enabled boolean. Disabled by default.
87 setsebool -P nis_enabled 1
89 If you want to allow confined applications to use nscd shared memory,
93 you must turn on the nscd_use_shm boolean. Enabled by default.
94 setsebool -P nscd_use_shm 1
96
100 SELinux defines port types to represent TCP and UDP ports.
101 You can see the types associated with a port by using the following
103 command:
104 semanage port -l
106 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.
111 The following port types are defined for dhcpd:
113 dhcpd_port_t
116 Default Defined Ports:
120 tcp 547,548,647,847,7911
121 udp 67,547,548,647,847
122
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.
127 cluster_conf_t
129 /etc/cluster(/.*)?
131 cluster_var_lib_t
133 /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(/.*)?
142 cluster_var_run_t
144 /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
156 dhcpd_state_t
158 /var/lib/dhcp(3)?/dhcpd.leases.*
160 /var/lib/dhcpd(/.*)?
161 dhcpd_tmp_t
163 dhcpd_var_run_t
166 /var/run/dhcpd(6)?.pid
168 root_t
170 /sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
172 /
173 /initrd
174
177 SELinux requires files to have an extended attribute to define the file
178 type.
179 You can see the context of a file using the -Z option to ls
181 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.
185 STANDARD FILE CONTEXT
187 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.
192 semanage fcontext -a -t dhcpd_var_run_t '/srv/mydhcpd_content(/.*)?'
194 restorecon -R -v /srv/mydhcpd_content
195 Note: SELinux often uses regular expressions to specify labels that
197 match multiple files.
198 The following file types are defined for dhcpd:
200 dhcpd_exec_t
204 - Set files with the dhcpd_exec_t type, if you want to transition an
206 executable to the dhcpd_t domain.
207 Paths:
210 /usr/sbin/dhcpd(6)?, /usr/sbin/dhcrelay(6)?
211 dhcpd_initrc_exec_t
214 - Set files with the dhcpd_initrc_exec_t type, if you want to transi‐
216 tion an executable to the dhcpd_initrc_t domain.
217 Paths:
220 /etc/rc.d/init.d/dhcpd(6)?, /etc/rc.d/init.d/dhcrelay(6)?
221 dhcpd_state_t
224 - Set files with the dhcpd_state_t type, if you want to treat the files
226 as dhcpd state data.
227 Paths:
230 /var/lib/dhcp(3)?/dhcpd.leases.*, /var/lib/dhcpd(/.*)?
231 dhcpd_tmp_t
234 - Set files with the dhcpd_tmp_t type, if you want to store dhcpd tem‐
236 porary files in the /tmp directories.
237 dhcpd_unit_file_t
241 - Set files with the dhcpd_unit_file_t type, if you want to treat the
243 files as dhcpd unit content.
244 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.*
250 dhcpd_var_run_t
253 - 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.
256 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.
263
266 semanage fcontext can also be used to manipulate default file context
267 mappings.
268 semanage permissive can also be used to manipulate whether or not a
270 process type is permissive.
271 semanage module can also be used to enable/disable/install/remove pol‐
273 icy modules.
274 semanage port can also be used to manipulate the port definitions
276 semanage boolean can also be used to manipulate the booleans
278 system-config-selinux is a GUI tool available to customize SELinux pol‐
281 icy settings.
282
285 This manual page was auto-generated using sepolicy manpage .
286
289 selinux(8), dhcpd(8), semanage(8), restorecon(8), chcon(1), sepol‐
290 icy(8), setsebool(8)
291dhcpd 19-10-08 dhcpd_selinux(8)