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 all domains to execute in fips_mode, you must turn
62 on the fips_mode boolean. Enabled by default.
63 setsebool -P fips_mode 1
65 If you want to allow system to run with NIS, you must turn on the
69 nis_enabled boolean. Disabled by default.
70 setsebool -P nis_enabled 1
72
76 The SELinux process type postfix_smtp_t can manage files labeled with
77 the following file types. The paths listed are the default paths for
78 these file types. Note the processes UID still need to have DAC per‐
79 missions.
80 anon_inodefs_t
82 postfix_prng_t
85 /etc/postfix/prng_exch
87 postfix_spool_t
89 /var/spool/postfix.*
91 /var/spool/postfix/defer(/.*)?
92 /var/spool/postfix/flush(/.*)?
93 /var/spool/postfix/deferred(/.*)?
94 /var/spool/postfix/maildrop(/.*)?
95 postfix_var_run_t
97 /var/spool/postfix/pid/.*
99
102 SELinux requires files to have an extended attribute to define the file
103 type.
104 You can see the context of a file using the -Z option to ls
106 Policy governs the access confined processes have to these files.
108 SELinux postfix_smtp policy is very flexible allowing users to setup
109 their postfix_smtp processes in as secure a method as possible.
110 STANDARD FILE CONTEXT
112 SELinux defines the file context types for the postfix_smtp, if you
114 wanted to store files with these types in a diffent paths, you need to
115 execute the semanage command to sepecify alternate labeling and then
116 use restorecon to put the labels on disk.
117 semanage fcontext -a -t postfix_smtpd_tmp_t '/srv/mypostfix_smtp_con‐
119 tent(/.*)?'
120 restorecon -R -v /srv/mypostfix_smtp_content
121 Note: SELinux often uses regular expressions to specify labels that
123 match multiple files.
124 The following file types are defined for postfix_smtp:
126 postfix_smtp_exec_t
130 - Set files with the postfix_smtp_exec_t type, if you want to transi‐
132 tion an executable to the postfix_smtp_t domain.
133 Paths:
136 /usr/libexec/postfix/lmtp, /usr/libexec/postfix/smtp,
137 /usr/libexec/postfix/scache
138 postfix_smtp_tmp_t
141 - Set files with the postfix_smtp_tmp_t type, if you want to store
143 postfix smtp temporary files in the /tmp directories.
144 postfix_smtpd_exec_t
148 - Set files with the postfix_smtpd_exec_t type, if you want to transi‐
150 tion an executable to the postfix_smtpd_t domain.
151 postfix_smtpd_tmp_t
155 - Set files with the postfix_smtpd_tmp_t type, if you want to store
157 postfix smtpd temporary files in the /tmp directories.
158 Note: File context can be temporarily modified with the chcon command.
162 If you want to permanently change the file context you need to use the
163 semanage fcontext command. This will modify the SELinux labeling data‐
164 base. You will need to use restorecon to apply the labels.
165
168 semanage fcontext can also be used to manipulate default file context
169 mappings.
170 semanage permissive can also be used to manipulate whether or not a
172 process type is permissive.
173 semanage module can also be used to enable/disable/install/remove pol‐
175 icy modules.
176 semanage boolean can also be used to manipulate the booleans
178 system-config-selinux is a GUI tool available to customize SELinux pol‐
181 icy settings.
182
185 This manual page was auto-generated using sepolicy manpage .
186
189 selinux(8), postfix_smtp(8), semanage(8), restorecon(8), chcon(1),
190 sepolicy(8), setsebool(8)
191postfix_smtp 21-03-26 postfix_smtp_selinux(8)