1postgrey_selinux(8) SELinux Policy postgrey postgrey_selinux(8)
2
3
4
6 postgrey_selinux - Security Enhanced Linux Policy for the postgrey pro‐
7 cesses
8
10 Security-Enhanced Linux secures the postgrey processes via flexible
11 mandatory access control.
12
13 The postgrey processes execute with the postgrey_t SELinux type. You
14 can check if you have these processes running by executing the ps com‐
15 mand with the -Z qualifier.
16
17 For example:
18
19 ps -eZ | grep postgrey_t
20
21
22
24 The postgrey_t SELinux type can be entered via the postgrey_exec_t file
25 type.
26
27 The default entrypoint paths for the postgrey_t domain are the follow‐
28 ing:
29
30 /usr/sbin/postgrey
31
33 SELinux defines process types (domains) for each process running on the
34 system
35
36 You can see the context of a process using the -Z option to ps
37
38 Policy governs the access confined processes have to files. SELinux
39 postgrey policy is very flexible allowing users to setup their postgrey
40 processes in as secure a method as possible.
41
42 The following process types are defined for postgrey:
43
44 postgrey_t
45
46 Note: semanage permissive -a postgrey_t can be used to make the process
47 type postgrey_t permissive. SELinux does not deny access to permissive
48 process types, but the AVC (SELinux denials) messages are still gener‐
49 ated.
50
51
53 SELinux policy is customizable based on least access required. post‐
54 grey policy is extremely flexible and has several booleans that allow
55 you to manipulate the policy and run postgrey with the tightest access
56 possible.
57
58
59
60 If you want to allow users to resolve user passwd entries directly from
61 ldap rather then using a sssd server, you must turn on the authlo‐
62 gin_nsswitch_use_ldap boolean. Disabled by default.
63
64 setsebool -P authlogin_nsswitch_use_ldap 1
65
66
67
68 If you want to allow all daemons to write corefiles to /, you must turn
69 on the daemons_dump_core boolean. Disabled by default.
70
71 setsebool -P daemons_dump_core 1
72
73
74
75 If you want to enable cluster mode for daemons, you must turn on the
76 daemons_enable_cluster_mode boolean. Enabled by default.
77
78 setsebool -P daemons_enable_cluster_mode 1
79
80
81
82 If you want to allow all daemons to use tcp wrappers, you must turn on
83 the daemons_use_tcp_wrapper boolean. Disabled by default.
84
85 setsebool -P daemons_use_tcp_wrapper 1
86
87
88
89 If you want to allow all daemons the ability to read/write terminals,
90 you must turn on the daemons_use_tty boolean. Disabled by default.
91
92 setsebool -P daemons_use_tty 1
93
94
95
96 If you want to deny any process from ptracing or debugging any other
97 processes, you must turn on the deny_ptrace boolean. Enabled by
98 default.
99
100 setsebool -P deny_ptrace 1
101
102
103
104 If you want to allow any process to mmap any file on system with
105 attribute file_type, you must turn on the domain_can_mmap_files bool‐
106 ean. Enabled by default.
107
108 setsebool -P domain_can_mmap_files 1
109
110
111
112 If you want to allow all domains write to kmsg_device, while kernel is
113 executed with systemd.log_target=kmsg parameter, you must turn on the
114 domain_can_write_kmsg boolean. Disabled by default.
115
116 setsebool -P domain_can_write_kmsg 1
117
118
119
120 If you want to allow all domains to use other domains file descriptors,
121 you must turn on the domain_fd_use boolean. Enabled by default.
122
123 setsebool -P domain_fd_use 1
124
125
126
127 If you want to allow all domains to have the kernel load modules, you
128 must turn on the domain_kernel_load_modules boolean. Disabled by
129 default.
130
131 setsebool -P domain_kernel_load_modules 1
132
133
134
135 If you want to allow all domains to execute in fips_mode, you must turn
136 on the fips_mode boolean. Enabled by default.
137
138 setsebool -P fips_mode 1
139
140
141
142 If you want to enable reading of urandom for all domains, you must turn
143 on the global_ssp boolean. Disabled by default.
144
145 setsebool -P global_ssp 1
146
147
148
149 If you want to allow confined applications to run with kerberos, you
150 must turn on the kerberos_enabled boolean. Enabled by default.
151
152 setsebool -P kerberos_enabled 1
153
154
155
156 If you want to allow system to run with NIS, you must turn on the
157 nis_enabled boolean. Disabled by default.
158
159 setsebool -P nis_enabled 1
160
161
162
163 If you want to allow confined applications to use nscd shared memory,
164 you must turn on the nscd_use_shm boolean. Disabled by default.
165
166 setsebool -P nscd_use_shm 1
167
168
169
171 SELinux defines port types to represent TCP and UDP ports.
172
173 You can see the types associated with a port by using the following
174 command:
175
176 semanage port -l
177
178
179 Policy governs the access confined processes have to these ports.
180 SELinux postgrey policy is very flexible allowing users to setup their
181 postgrey processes in as secure a method as possible.
182
183 The following port types are defined for postgrey:
184
185
186 postgrey_port_t
187
188
189
190 Default Defined Ports:
191 tcp 60000
192
194 The SELinux process type postgrey_t can manage files labeled with the
195 following file types. The paths listed are the default paths for these
196 file types. Note the processes UID still need to have DAC permissions.
197
198 cluster_conf_t
199
200 /etc/cluster(/.*)?
201
202 cluster_var_lib_t
203
204 /var/lib/pcsd(/.*)?
205 /var/lib/cluster(/.*)?
206 /var/lib/openais(/.*)?
207 /var/lib/pengine(/.*)?
208 /var/lib/corosync(/.*)?
209 /usr/lib/heartbeat(/.*)?
210 /var/lib/heartbeat(/.*)?
211 /var/lib/pacemaker(/.*)?
212
213 cluster_var_run_t
214
215 /var/run/crm(/.*)?
216 /var/run/cman_.*
217 /var/run/rsctmp(/.*)?
218 /var/run/aisexec.*
219 /var/run/heartbeat(/.*)?
220 /var/run/corosync-qnetd(/.*)?
221 /var/run/corosync-qdevice(/.*)?
222 /var/run/cpglockd.pid
223 /var/run/corosync.pid
224 /var/run/rgmanager.pid
225 /var/run/cluster/rgmanager.sk
226
227 postfix_spool_type
228
229
230 postgrey_spool_t
231
232 /var/spool/postfix/postgrey(/.*)?
233
234 postgrey_var_lib_t
235
236 /var/lib/postgrey(/.*)?
237
238 postgrey_var_run_t
239
240 /var/run/postgrey(/.*)?
241 /var/run/postgrey.pid
242
243 root_t
244
245 /sysroot/ostree/deploy/.*-atomic.*/deploy(/.*)?
246 /
247 /initrd
248
249
251 SELinux requires files to have an extended attribute to define the file
252 type.
253
254 You can see the context of a file using the -Z option to ls
255
256 Policy governs the access confined processes have to these files.
257 SELinux postgrey policy is very flexible allowing users to setup their
258 postgrey processes in as secure a method as possible.
259
260 EQUIVALENCE DIRECTORIES
261
262
263 postgrey policy stores data with multiple different file context types
264 under the /var/run/postgrey directory. If you would like to store the
265 data in a different directory you can use the semanage command to cre‐
266 ate an equivalence mapping. If you wanted to store this data under the
267 /srv dirctory you would execute the following command:
268
269 semanage fcontext -a -e /var/run/postgrey /srv/postgrey
270 restorecon -R -v /srv/postgrey
271
272 STANDARD FILE CONTEXT
273
274 SELinux defines the file context types for the postgrey, if you wanted
275 to store files with these types in a diffent paths, you need to execute
276 the semanage command to sepecify alternate labeling and then use
277 restorecon to put the labels on disk.
278
279 semanage fcontext -a -t postgrey_var_run_t '/srv/mypostgrey_con‐
280 tent(/.*)?'
281 restorecon -R -v /srv/mypostgrey_content
282
283 Note: SELinux often uses regular expressions to specify labels that
284 match multiple files.
285
286 The following file types are defined for postgrey:
287
288
289
290 postgrey_etc_t
291
292 - Set files with the postgrey_etc_t type, if you want to store postgrey
293 files in the /etc directories.
294
295
296
297 postgrey_exec_t
298
299 - Set files with the postgrey_exec_t type, if you want to transition an
300 executable to the postgrey_t domain.
301
302
303
304 postgrey_initrc_exec_t
305
306 - Set files with the postgrey_initrc_exec_t type, if you want to tran‐
307 sition an executable to the postgrey_initrc_t domain.
308
309
310
311 postgrey_spool_t
312
313 - Set files with the postgrey_spool_t type, if you want to store the
314 postgrey files under the /var/spool directory.
315
316
317
318 postgrey_var_lib_t
319
320 - Set files with the postgrey_var_lib_t type, if you want to store the
321 postgrey files under the /var/lib directory.
322
323
324
325 postgrey_var_run_t
326
327 - Set files with the postgrey_var_run_t type, if you want to store the
328 postgrey files under the /run or /var/run directory.
329
330
331 Paths:
332 /var/run/postgrey(/.*)?, /var/run/postgrey.pid
333
334
335 Note: File context can be temporarily modified with the chcon command.
336 If you want to permanently change the file context you need to use the
337 semanage fcontext command. This will modify the SELinux labeling data‐
338 base. You will need to use restorecon to apply the labels.
339
340
342 semanage fcontext can also be used to manipulate default file context
343 mappings.
344
345 semanage permissive can also be used to manipulate whether or not a
346 process type is permissive.
347
348 semanage module can also be used to enable/disable/install/remove pol‐
349 icy modules.
350
351 semanage port can also be used to manipulate the port definitions
352
353 semanage boolean can also be used to manipulate the booleans
354
355
356 system-config-selinux is a GUI tool available to customize SELinux pol‐
357 icy settings.
358
359
361 This manual page was auto-generated using sepolicy manpage .
362
363
365 selinux(8), postgrey(8), semanage(8), restorecon(8), chcon(1), sepol‐
366 icy(8) , setsebool(8)
367
368
369
370postgrey 19-04-25 postgrey_selinux(8)