sendmail_selinux(8)

1sendmail_selinux(8)         SELinux Policy sendmail        sendmail_selinux(8)
2
3
4

NAME

6       sendmail_selinux - Security Enhanced Linux Policy for the sendmail pro‐
7       cesses
8

DESCRIPTION

10       Security-Enhanced Linux secures the  sendmail  processes  via  flexible
11       mandatory access control.
12
13       The  sendmail  processes  execute with the sendmail_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 sendmail_t
20
21
22

ENTRYPOINTS

24       The sendmail_t SELinux type can be entered via the mta_exec_type, send‐
25       mail_exec_t, mta_exec_type file types.
26
27       The default entrypoint paths for the sendmail_t domain are the  follow‐
28       ing:
29
30       /usr/sbin/sendmail(.sendmail)?,     /usr/bin/esmtp,    /usr/sbin/rmail,
31       /usr/sbin/ssmtp,      /usr/lib/sendmail,       /var/qmail/bin/sendmail,
32       /usr/sbin/sendmail.postfix
33

PROCESS TYPES

35       SELinux defines process types (domains) for each process running on the
36       system
37
38       You can see the context of a process using the -Z option to ps
39
40       Policy governs the access confined processes have  to  files.   SELinux
41       sendmail policy is very flexible allowing users to setup their sendmail
42       processes in as secure a method as possible.
43
44       The following process types are defined for sendmail:
45
46       sendmail_t
47
48       Note: semanage permissive -a sendmail_t can be used to make the process
49       type  sendmail_t permissive. SELinux does not deny access to permissive
50       process types, but the AVC (SELinux denials) messages are still  gener‐
51       ated.
52
53

BOOLEANS

55       SELinux  policy  is customizable based on least access required.  send‐
56       mail policy is extremely flexible and has several booleans  that  allow
57       you  to manipulate the policy and run sendmail with the tightest access
58       possible.
59
60
61
62       If you want to allow users to resolve user passwd entries directly from
63       ldap  rather  then  using  a  sssd server, you must turn on the authlo‐
64       gin_nsswitch_use_ldap boolean. Disabled by default.
65
66       setsebool -P authlogin_nsswitch_use_ldap 1
67
68
69
70       If you want to allow all daemons the ability to  read/write  terminals,
71       you must turn on the daemons_use_tty boolean. Disabled by default.
72
73       setsebool -P daemons_use_tty 1
74
75
76
77       If  you  want  to deny any process from ptracing or debugging any other
78       processes, you  must  turn  on  the  deny_ptrace  boolean.  Enabled  by
79       default.
80
81       setsebool -P deny_ptrace 1
82
83
84
85       If  you  want  to  allow  any  process  to mmap any file on system with
86       attribute file_type, you must turn on the  domain_can_mmap_files  bool‐
87       ean. Enabled by default.
88
89       setsebool -P domain_can_mmap_files 1
90
91
92
93       If  you want to allow all domains write to kmsg_device, while kernel is
94       executed with systemd.log_target=kmsg parameter, you must turn  on  the
95       domain_can_write_kmsg boolean. Disabled by default.
96
97       setsebool -P domain_can_write_kmsg 1
98
99
100
101       If you want to allow all domains to use other domains file descriptors,
102       you must turn on the domain_fd_use boolean. Enabled by default.
103
104       setsebool -P domain_fd_use 1
105
106
107
108       If you want to allow all domains to have the kernel load  modules,  you
109       must  turn  on  the  domain_kernel_load_modules  boolean.  Disabled  by
110       default.
111
112       setsebool -P domain_kernel_load_modules 1
113
114
115
116       If you want to allow all domains to execute in fips_mode, you must turn
117       on the fips_mode boolean. Enabled by default.
118
119       setsebool -P fips_mode 1
120
121
122
123       If you want to enable reading of urandom for all domains, you must turn
124       on the global_ssp boolean. Disabled by default.
125
126       setsebool -P global_ssp 1
127
128
129
130       If you want to allow confined applications to run  with  kerberos,  you
131       must turn on the kerberos_enabled boolean. Enabled by default.
132
133       setsebool -P kerberos_enabled 1
134
135
136
137       If  you  want  to  allow  system  to run with NIS, you must turn on the
138       nis_enabled boolean. Disabled by default.
139
140       setsebool -P nis_enabled 1
141
142
143
144       If you want to allow confined applications to use nscd  shared  memory,
145       you must turn on the nscd_use_shm boolean. Disabled by default.
146
147       setsebool -P nscd_use_shm 1
148
149
150
151       If  you want to allow Redis to run redis-sentinal notification scripts,
152       you must turn on the redis_enable_notify boolean. Disabled by default.
153
154       setsebool -P redis_enable_notify 1
155
156
157
158       If you want to support ecryptfs home directories, you must turn on  the
159       use_ecryptfs_home_dirs boolean. Disabled by default.
160
161       setsebool -P use_ecryptfs_home_dirs 1
162
163
164
165       If  you  want  to support fusefs home directories, you must turn on the
166       use_fusefs_home_dirs boolean. Disabled by default.
167
168       setsebool -P use_fusefs_home_dirs 1
169
170
171
172       If you want to support NFS home  directories,  you  must  turn  on  the
173       use_nfs_home_dirs boolean. Disabled by default.
174
175       setsebool -P use_nfs_home_dirs 1
176
177
178
179       If  you  want  to  support SAMBA home directories, you must turn on the
180       use_samba_home_dirs boolean. Disabled by default.
181
182       setsebool -P use_samba_home_dirs 1
183
184
185

MANAGED FILES

187       The SELinux process type sendmail_t can manage files labeled  with  the
188       following file types.  The paths listed are the default paths for these
189       file types.  Note the processes UID still need to have DAC permissions.
190
191       anon_inodefs_t
192
193
194       cifs_t
195
196
197       dovecot_spool_t
198
199            /var/spool/dovecot(/.*)?
200
201       ecryptfs_t
202
203            /home/[^/]+/.Private(/.*)?
204            /home/[^/]+/.ecryptfs(/.*)?
205
206       etc_aliases_t
207
208            /etc/mail/.*.db
209            /etc/mail/aliases.*
210            /etc/postfix/aliases.*
211            /etc/aliases
212            /etc/aliases.db
213
214       exim_spool_t
215
216            /var/spool/exim[0-9]?(/.*)?
217
218       fusefs_t
219
220            /var/run/user/[^/]*/gvfs
221
222       initrc_tmp_t
223
224
225       mail_home_rw_t
226
227            /root/Maildir(/.*)?
228            /root/.esmtp_queue(/.*)?
229            /home/[^/]+/.maildir(/.*)?
230            /home/[^/]+/Maildir(/.*)?
231            /home/[^/]+/.esmtp_queue(/.*)?
232
233       mail_spool_t
234
235            /var/mail(/.*)?
236            /var/spool/imap(/.*)?
237            /var/spool/mail(/.*)?
238            /var/spool/smtpd(/.*)?
239
240       mailman_data_t
241
242            /etc/mailman.*
243            /var/lib/mailman(/.*)?
244            /var/spool/mailman.*
245
246       mqueue_spool_t
247
248            /var/spool/(client)?mqueue(/.*)?
249            /var/spool/mqueue.in(/.*)?
250
251       nfs_t
252
253
254       procmail_tmp_t
255
256
257       sendmail_log_t
258
259            /var/log/mail(/.*)?
260            /var/log/sendmail.st.*
261
262       sendmail_tmp_t
263
264
265       sendmail_var_run_t
266
267            /var/run/sendmail.pid
268            /var/run/sm-client.pid
269
270       user_home_t
271
272            /home/[^/]+/.+
273
274

FILE CONTEXTS

276       SELinux requires files to have an extended attribute to define the file
277       type.
278
279       You can see the context of a file using the -Z option to ls
280
281       Policy  governs  the  access  confined  processes  have to these files.
282       SELinux sendmail policy is very flexible allowing users to setup  their
283       sendmail processes in as secure a method as possible.
284
285       STANDARD FILE CONTEXT
286
287       SELinux  defines the file context types for the sendmail, if you wanted
288       to store files with these types in a diffent paths, you need to execute
289       the  semanage  command  to  sepecify  alternate  labeling  and then use
290       restorecon to put the labels on disk.
291
292       semanage  fcontext  -a  -t   sendmail_var_run_t   '/srv/mysendmail_con‐
293       tent(/.*)?'
294       restorecon -R -v /srv/mysendmail_content
295
296       Note:  SELinux  often  uses  regular expressions to specify labels that
297       match multiple files.
298
299       The following file types are defined for sendmail:
300
301
302
303       sendmail_exec_t
304
305       - Set files with the sendmail_exec_t type, if you want to transition an
306       executable to the sendmail_t domain.
307
308
309       Paths:
310            /usr/sbin/sendmail(.sendmail)?,  /usr/bin/esmtp,  /usr/sbin/rmail,
311            /usr/sbin/ssmtp,    /usr/lib/sendmail,    /var/qmail/bin/sendmail,
312            /usr/sbin/sendmail.postfix
313
314
315       sendmail_initrc_exec_t
316
317       -  Set files with the sendmail_initrc_exec_t type, if you want to tran‐
318       sition an executable to the sendmail_initrc_t domain.
319
320
321
322       sendmail_keytab_t
323
324       - Set files with the sendmail_keytab_t type, if you want to  treat  the
325       files as kerberos keytab files.
326
327
328
329       sendmail_log_t
330
331       - Set files with the sendmail_log_t type, if you want to treat the data
332       as sendmail log data, usually stored under the /var/log directory.
333
334
335       Paths:
336            /var/log/mail(/.*)?, /var/log/sendmail.st.*
337
338
339       sendmail_tmp_t
340
341       - Set files with the sendmail_tmp_t type, if you want to store sendmail
342       temporary files in the /tmp directories.
343
344
345
346       sendmail_var_run_t
347
348       -  Set files with the sendmail_var_run_t type, if you want to store the
349       sendmail files under the /run or /var/run directory.
350
351
352       Paths:
353            /var/run/sendmail.pid, /var/run/sm-client.pid
354
355
356       Note: File context can be temporarily modified with the chcon  command.
357       If  you want to permanently change the file context you need to use the
358       semanage fcontext command.  This will modify the SELinux labeling data‐
359       base.  You will need to use restorecon to apply the labels.
360
361

COMMANDS

363       semanage  fcontext  can also be used to manipulate default file context
364       mappings.
365
366       semanage permissive can also be used to manipulate  whether  or  not  a
367       process type is permissive.
368
369       semanage  module can also be used to enable/disable/install/remove pol‐
370       icy modules.
371
372       semanage boolean can also be used to manipulate the booleans
373
374
375       system-config-selinux is a GUI tool available to customize SELinux pol‐
376       icy settings.
377
378

AUTHOR

380       This manual page was auto-generated using sepolicy manpage .
381
382