1postfix_local_selinux(8) SELinux Policy postfix_local postfix_local_selinux(8)
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6 postfix_local_selinux - Security Enhanced Linux Policy for the post‐
7 fix_local processes
8
10 Security-Enhanced Linux secures the postfix_local processes via flexi‐
11 ble mandatory access control.
12 The postfix_local processes execute with the postfix_local_t SELinux
14 type. You can check if you have these processes running by executing
15 the ps command with the -Z qualifier.
16 For example:
18 ps -eZ | grep postfix_local_t
20
24 The postfix_local_t SELinux type can be entered via the post‐
25 fix_local_exec_t file type.
26 The default entrypoint paths for the postfix_local_t domain are the
28 following:
29 /usr/libexec/postfix/local
31
33 SELinux defines process types (domains) for each process running on the
34 system
35 You can see the context of a process using the -Z option to ps
37 Policy governs the access confined processes have to files. SELinux
39 postfix_local policy is very flexible allowing users to setup their
40 postfix_local processes in as secure a method as possible.
41 The following process types are defined for postfix_local:
43 postfix_local_t
45 Note: semanage permissive -a postfix_local_t can be used to make the
47 process type postfix_local_t permissive. SELinux does not deny access
48 to permissive process types, but the AVC (SELinux denials) messages are
49 still generated.
50
53 SELinux policy is customizable based on least access required. post‐
54 fix_local policy is extremely flexible and has several booleans that
55 allow you to manipulate the policy and run postfix_local with the
56 tightest access possible.
57 If you want to allow postfix_local domain full write access to
61 mail_spool directories, you must turn on the post‐
62 fix_local_write_mail_spool boolean. Enabled by default.
63 setsebool -P postfix_local_write_mail_spool 1
65 If you want to allow users to resolve user passwd entries directly from
69 ldap rather then using a sssd server, you must turn on the authlo‐
70 gin_nsswitch_use_ldap boolean. Disabled by default.
71 setsebool -P authlogin_nsswitch_use_ldap 1
73 If you want to deny any process from ptracing or debugging any other
77 processes, you must turn on the deny_ptrace boolean. Enabled by
78 default.
79 setsebool -P deny_ptrace 1
81 If you want to allow any process to mmap any file on system with
85 attribute file_type, you must turn on the domain_can_mmap_files bool‐
86 ean. Enabled by default.
87 setsebool -P domain_can_mmap_files 1
89 If you want to allow all domains write to kmsg_device, while kernel is
93 executed with systemd.log_target=kmsg parameter, you must turn on the
94 domain_can_write_kmsg boolean. Disabled by default.
95 setsebool -P domain_can_write_kmsg 1
97 If you want to allow all domains to use other domains file descriptors,
101 you must turn on the domain_fd_use boolean. Enabled by default.
102 setsebool -P domain_fd_use 1
104 If you want to allow all domains to have the kernel load modules, you
108 must turn on the domain_kernel_load_modules boolean. Disabled by
109 default.
110 setsebool -P domain_kernel_load_modules 1
112 If you want to allow all domains to execute in fips_mode, you must turn
116 on the fips_mode boolean. Enabled by default.
117 setsebool -P fips_mode 1
119 If you want to enable reading of urandom for all domains, you must turn
123 on the global_ssp boolean. Disabled by default.
124 setsebool -P global_ssp 1
126 If you want to allow confined applications to run with kerberos, you
130 must turn on the kerberos_enabled boolean. Enabled by default.
131 setsebool -P kerberos_enabled 1
133 If you want to allow system to run with NIS, you must turn on the
137 nis_enabled boolean. Disabled by default.
138 setsebool -P nis_enabled 1
140 If you want to allow confined applications to use nscd shared memory,
144 you must turn on the nscd_use_shm boolean. Disabled by default.
145 setsebool -P nscd_use_shm 1
147 If you want to support ecryptfs home directories, you must turn on the
151 use_ecryptfs_home_dirs boolean. Disabled by default.
152 setsebool -P use_ecryptfs_home_dirs 1
154 If you want to support fusefs home directories, you must turn on the
158 use_fusefs_home_dirs boolean. Disabled by default.
159 setsebool -P use_fusefs_home_dirs 1
161 If you want to support NFS home directories, you must turn on the
165 use_nfs_home_dirs boolean. Disabled by default.
166 setsebool -P use_nfs_home_dirs 1
168 If you want to support SAMBA home directories, you must turn on the
172 use_samba_home_dirs boolean. Disabled by default.
173 setsebool -P use_samba_home_dirs 1
175
179 The SELinux process type postfix_local_t can manage files labeled with
180 the following file types. The paths listed are the default paths for
181 these file types. Note the processes UID still need to have DAC per‐
182 missions.
183 anon_inodefs_t
185 cifs_t
188 dovecot_spool_t
191 /var/spool/dovecot(/.*)?
193 ecryptfs_t
195 /home/[^/]+/.Private(/.*)?
197 /home/[^/]+/.ecryptfs(/.*)?
198 fusefs_t
200 /var/run/user/[^/]*/gvfs
202 mail_home_rw_t
204 /root/Maildir(/.*)?
206 /root/.esmtp_queue(/.*)?
207 /home/[^/]+/.maildir(/.*)?
208 /home/[^/]+/Maildir(/.*)?
209 /home/[^/]+/.esmtp_queue(/.*)?
210 mail_spool_t
212 /var/mail(/.*)?
214 /var/spool/imap(/.*)?
215 /var/spool/mail(/.*)?
216 /var/spool/smtpd(/.*)?
217 mailman_data_t
219 /etc/mailman.*
221 /var/lib/mailman(/.*)?
222 /var/spool/mailman.*
223 nfs_t
225 postfix_local_tmp_t
228 postfix_spool_t
231 /var/spool/postfix.*
233 /var/spool/postfix/defer(/.*)?
234 /var/spool/postfix/flush(/.*)?
235 /var/spool/postfix/deferred(/.*)?
236 /var/spool/postfix/maildrop(/.*)?
237 postfix_var_run_t
239 /var/spool/postfix/pid/.*
241 user_home_t
243 /home/[^/]+/.+
245
248 SELinux requires files to have an extended attribute to define the file
249 type.
250 You can see the context of a file using the -Z option to ls
252 Policy governs the access confined processes have to these files.
254 SELinux postfix_local policy is very flexible allowing users to setup
255 their postfix_local processes in as secure a method as possible.
256 STANDARD FILE CONTEXT
258 SELinux defines the file context types for the postfix_local, if you
260 wanted to store files with these types in a diffent paths, you need to
261 execute the semanage command to sepecify alternate labeling and then
262 use restorecon to put the labels on disk.
263 semanage fcontext -a -t postfix_local_tmp_t '/srv/mypostfix_local_con‐
265 tent(/.*)?'
266 restorecon -R -v /srv/mypostfix_local_content
267 Note: SELinux often uses regular expressions to specify labels that
269 match multiple files.
270 The following file types are defined for postfix_local:
272 postfix_local_exec_t
276 - Set files with the postfix_local_exec_t type, if you want to transi‐
278 tion an executable to the postfix_local_t domain.
279 postfix_local_tmp_t
283 - Set files with the postfix_local_tmp_t type, if you want to store
285 postfix local temporary files in the /tmp directories.
286 Note: File context can be temporarily modified with the chcon command.
290 If you want to permanently change the file context you need to use the
291 semanage fcontext command. This will modify the SELinux labeling data‐
292 base. You will need to use restorecon to apply the labels.
293
296 semanage fcontext can also be used to manipulate default file context
297 mappings.
298 semanage permissive can also be used to manipulate whether or not a
300 process type is permissive.
301 semanage module can also be used to enable/disable/install/remove pol‐
303 icy modules.
304 semanage boolean can also be used to manipulate the booleans
306 system-config-selinux is a GUI tool available to customize SELinux pol‐
309 icy settings.
310
313 This manual page was auto-generated using sepolicy manpage .
314
317 selinux(8), postfix_local(8), semanage(8), restorecon(8), chcon(1),
318 sepolicy(8) , setsebool(8)
319postfix_local 19-04-25 postfix_local_selinux(8)