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 al‐
56 low you to manipulate the policy and run postfix_smtp with the tightest
57 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 krb5_host_rcache_t
82 /var/tmp/krb5_0.rcache2
84 /var/cache/krb5rcache(/.*)?
85 /var/tmp/nfs_0
86 /var/tmp/DNS_25
87 /var/tmp/host_0
88 /var/tmp/imap_0
89 /var/tmp/HTTP_23
90 /var/tmp/HTTP_48
91 /var/tmp/ldap_55
92 /var/tmp/ldap_487
93 /var/tmp/ldapmap1_0
94 postfix_prng_t
96 /etc/postfix/prng_exch
98 postfix_smtp_tmp_t
100 postfix_spool_t
103 /var/spool/postfix.*
105 /var/spool/postfix/defer(/.*)?
106 /var/spool/postfix/flush(/.*)?
107 /var/spool/postfix/deferred(/.*)?
108 /var/spool/postfix/maildrop(/.*)?
109 postfix_var_run_t
111 /var/spool/postfix/pid/.*
113
116 SELinux requires files to have an extended attribute to define the file
117 type.
118 You can see the context of a file using the -Z option to ls
120 Policy governs the access confined processes have to these files.
122 SELinux postfix_smtp policy is very flexible allowing users to setup
123 their postfix_smtp processes in as secure a method as possible.
124 STANDARD FILE CONTEXT
126 SELinux defines the file context types for the postfix_smtp, if you
128 wanted to store files with these types in a diffent paths, you need to
129 execute the semanage command to specify alternate labeling and then use
130 restorecon to put the labels on disk.
131 semanage fcontext -a -t postfix_smtpd_tmp_t '/srv/mypostfix_smtp_con‐
133 tent(/.*)?'
134 restorecon -R -v /srv/mypostfix_smtp_content
135 Note: SELinux often uses regular expressions to specify labels that
137 match multiple files.
138 The following file types are defined for postfix_smtp:
140 postfix_smtp_exec_t
144 - Set files with the postfix_smtp_exec_t type, if you want to transi‐
146 tion an executable to the postfix_smtp_t domain.
147 Paths:
150 /usr/libexec/postfix/lmtp, /usr/libexec/postfix/smtp,
151 /usr/libexec/postfix/scache
152 postfix_smtp_tmp_t
155 - Set files with the postfix_smtp_tmp_t type, if you want to store
157 postfix smtp temporary files in the /tmp directories.
158 postfix_smtpd_exec_t
162 - Set files with the postfix_smtpd_exec_t type, if you want to transi‐
164 tion an executable to the postfix_smtpd_t domain.
165 postfix_smtpd_tmp_t
169 - Set files with the postfix_smtpd_tmp_t type, if you want to store
171 postfix smtpd temporary files in the /tmp directories.
172 Note: File context can be temporarily modified with the chcon command.
176 If you want to permanently change the file context you need to use the
177 semanage fcontext command. This will modify the SELinux labeling data‐
178 base. You will need to use restorecon to apply the labels.
179
182 semanage fcontext can also be used to manipulate default file context
183 mappings.
184 semanage permissive can also be used to manipulate whether or not a
186 process type is permissive.
187 semanage module can also be used to enable/disable/install/remove pol‐
189 icy modules.
190 semanage boolean can also be used to manipulate the booleans
192 system-config-selinux is a GUI tool available to customize SELinux pol‐
195 icy settings.
196
199 This manual page was auto-generated using sepolicy manpage .
200
203 selinux(8), postfix_smtp(8), semanage(8), restorecon(8), chcon(1), se‐
204 policy(8), setsebool(8)
205postfix_smtp 23-02-03 postfix_smtp_selinux(8)