1postfix_smtp_selinux(8) SELinux Policy postfix_smtp postfix_smtp_selinux(8)
2
6 postfix_smtp_selinux - Security Enhanced Linux Policy for the post‐
7 fix_smtp processes
8
10 Security-Enhanced Linux secures the postfix_smtp processes via flexible
11 mandatory access control.
12 The postfix_smtp processes execute with the postfix_smtp_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_smtp_t
20
24 The postfix_smtp_t SELinux type can be entered via the post‐
25 fix_smtp_exec_t file type.
26 The default entrypoint paths for the postfix_smtp_t domain are the fol‐
28 lowing:
29 /usr/libexec/postfix/lmtp, /usr/libexec/postfix/smtp,
31 /usr/libexec/postfix/scache
32
34 SELinux defines process types (domains) for each process running on the
35 system
36 You can see the context of a process using the -Z option to ps
38 Policy governs the access confined processes have to files. SELinux
40 postfix_smtp policy is very flexible allowing users to setup their
41 postfix_smtp processes in as secure a method as possible.
42 The following process types are defined for postfix_smtp:
44 postfix_smtp_t, postfix_smtpd_t
46 Note: semanage permissive -a postfix_smtp_t can be used to make the
48 process type postfix_smtp_t permissive. SELinux does not deny access to
49 permissive process types, but the AVC (SELinux denials) messages are
50 still generated.
51
54 SELinux policy is customizable based on least access required. post‐
55 fix_smtp policy is extremely flexible and has several booleans that
56 allow you to manipulate the policy and run postfix_smtp with the tight‐
57 est access possible.
58 If you want to allow users to resolve user passwd entries directly from
62 ldap rather then using a sssd server, you must turn on the authlo‐
63 gin_nsswitch_use_ldap boolean. Disabled by default.
64 setsebool -P authlogin_nsswitch_use_ldap 1
66 If you want to allow all domains to execute in fips_mode, you must turn
70 on the fips_mode boolean. Enabled by default.
71 setsebool -P fips_mode 1
73 If you want to allow confined applications to run with kerberos, you
77 must turn on the kerberos_enabled boolean. Enabled by default.
78 setsebool -P kerberos_enabled 1
80 If you want to allow system to run with NIS, you must turn on the
84 nis_enabled boolean. Disabled by default.
85 setsebool -P nis_enabled 1
87 If you want to allow confined applications to use nscd shared memory,
91 you must turn on the nscd_use_shm boolean. Disabled by default.
92 setsebool -P nscd_use_shm 1
94
98 The SELinux process type postfix_smtp_t can manage files labeled with
99 the following file types. The paths listed are the default paths for
100 these file types. Note the processes UID still need to have DAC per‐
101 missions.
102 anon_inodefs_t
104 postfix_prng_t
107 /etc/postfix/prng_exch
109 postfix_smtp_tmp_t
111 postfix_spool_t
114 /var/spool/postfix.*
116 /var/spool/postfix/defer(/.*)?
117 /var/spool/postfix/flush(/.*)?
118 /var/spool/postfix/deferred(/.*)?
119 /var/spool/postfix/maildrop(/.*)?
120 postfix_var_run_t
122 /var/spool/postfix/pid/.*
124
127 SELinux requires files to have an extended attribute to define the file
128 type.
129 You can see the context of a file using the -Z option to ls
131 Policy governs the access confined processes have to these files.
133 SELinux postfix_smtp policy is very flexible allowing users to setup
134 their postfix_smtp processes in as secure a method as possible.
135 STANDARD FILE CONTEXT
137 SELinux defines the file context types for the postfix_smtp, if you
139 wanted to store files with these types in a diffent paths, you need to
140 execute the semanage command to sepecify alternate labeling and then
141 use restorecon to put the labels on disk.
142 semanage fcontext -a -t postfix_smtpd_tmp_t '/srv/mypostfix_smtp_con‐
144 tent(/.*)?'
145 restorecon -R -v /srv/mypostfix_smtp_content
146 Note: SELinux often uses regular expressions to specify labels that
148 match multiple files.
149 The following file types are defined for postfix_smtp:
151 postfix_smtp_exec_t
155 - Set files with the postfix_smtp_exec_t type, if you want to transi‐
157 tion an executable to the postfix_smtp_t domain.
158 Paths:
161 /usr/libexec/postfix/lmtp, /usr/libexec/postfix/smtp,
162 /usr/libexec/postfix/scache
163 postfix_smtp_tmp_t
166 - Set files with the postfix_smtp_tmp_t type, if you want to store
168 postfix smtp temporary files in the /tmp directories.
169 postfix_smtpd_exec_t
173 - Set files with the postfix_smtpd_exec_t type, if you want to transi‐
175 tion an executable to the postfix_smtpd_t domain.
176 postfix_smtpd_tmp_t
180 - Set files with the postfix_smtpd_tmp_t type, if you want to store
182 postfix smtpd temporary files in the /tmp directories.
183 Note: File context can be temporarily modified with the chcon command.
187 If you want to permanently change the file context you need to use the
188 semanage fcontext command. This will modify the SELinux labeling data‐
189 base. You will need to use restorecon to apply the labels.
190
193 semanage fcontext can also be used to manipulate default file context
194 mappings.
195 semanage permissive can also be used to manipulate whether or not a
197 process type is permissive.
198 semanage module can also be used to enable/disable/install/remove pol‐
200 icy modules.
201 semanage boolean can also be used to manipulate the booleans
203 system-config-selinux is a GUI tool available to customize SELinux pol‐
206 icy settings.
207
210 This manual page was auto-generated using sepolicy manpage .
211
214 selinux(8), postfix_smtp(8), semanage(8), restorecon(8), chcon(1),
215 sepolicy(8), setsebool(8)
216postfix_smtp 19-06-18 postfix_smtp_selinux(8)