1postfix_qmgr_selinux(8) SELinux Policy postfix_qmgr postfix_qmgr_selinux(8)
2
6 postfix_qmgr_selinux - Security Enhanced Linux Policy for the post‐
7 fix_qmgr processes
8
10 Security-Enhanced Linux secures the postfix_qmgr processes via flexible
11 mandatory access control.
12 The postfix_qmgr processes execute with the postfix_qmgr_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_qmgr_t
20
24 The postfix_qmgr_t SELinux type can be entered via the post‐
25 fix_qmgr_exec_t file type.
26 The default entrypoint paths for the postfix_qmgr_t domain are the fol‐
28 lowing:
29 /usr/libexec/postfix/(n)?qmgr
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_qmgr policy is very flexible allowing users to setup their
40 postfix_qmgr processes in as secure a method as possible.
41 The following process types are defined for postfix_qmgr:
43 postfix_qmgr_t
45 Note: semanage permissive -a postfix_qmgr_t can be used to make the
47 process type postfix_qmgr_t permissive. SELinux does not deny access to
48 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_qmgr policy is extremely flexible and has several booleans that
55 allow you to manipulate the policy and run postfix_qmgr with the tight‐
56 est access possible.
57 If you want to allow users to resolve user passwd entries directly from
61 ldap rather then using a sssd server, you must turn on the authlo‐
62 gin_nsswitch_use_ldap boolean. Disabled by default.
63 setsebool -P authlogin_nsswitch_use_ldap 1
65 If you want to allow all domains to execute in fips_mode, you must turn
69 on the fips_mode boolean. Enabled by default.
70 setsebool -P fips_mode 1
72 If you want to allow confined applications to run with kerberos, you
76 must turn on the kerberos_enabled boolean. Enabled by default.
77 setsebool -P kerberos_enabled 1
79 If you want to allow system to run with NIS, you must turn on the
83 nis_enabled boolean. Disabled by default.
84 setsebool -P nis_enabled 1
86 If you want to allow confined applications to use nscd shared memory,
90 you must turn on the nscd_use_shm boolean. Enabled by default.
91 setsebool -P nscd_use_shm 1
93
97 The SELinux process type postfix_qmgr_t can manage files labeled with
98 the following file types. The paths listed are the default paths for
99 these file types. Note the processes UID still need to have DAC per‐
100 missions.
101 anon_inodefs_t
103 postfix_qmgr_tmp_t
106 postfix_spool_t
109 /var/spool/postfix.*
111 /var/spool/postfix/defer(/.*)?
112 /var/spool/postfix/flush(/.*)?
113 /var/spool/postfix/deferred(/.*)?
114 /var/spool/postfix/maildrop(/.*)?
115 postfix_var_run_t
117 /var/spool/postfix/pid/.*
119
122 SELinux requires files to have an extended attribute to define the file
123 type.
124 You can see the context of a file using the -Z option to ls
126 Policy governs the access confined processes have to these files.
128 SELinux postfix_qmgr policy is very flexible allowing users to setup
129 their postfix_qmgr processes in as secure a method as possible.
130 STANDARD FILE CONTEXT
132 SELinux defines the file context types for the postfix_qmgr, if you
134 wanted to store files with these types in a diffent paths, you need to
135 execute the semanage command to sepecify alternate labeling and then
136 use restorecon to put the labels on disk.
137 semanage fcontext -a -t postfix_qmgr_tmp_t '/srv/mypostfix_qmgr_con‐
139 tent(/.*)?'
140 restorecon -R -v /srv/mypostfix_qmgr_content
141 Note: SELinux often uses regular expressions to specify labels that
143 match multiple files.
144 The following file types are defined for postfix_qmgr:
146 postfix_qmgr_exec_t
150 - Set files with the postfix_qmgr_exec_t type, if you want to transi‐
152 tion an executable to the postfix_qmgr_t domain.
153 postfix_qmgr_tmp_t
157 - Set files with the postfix_qmgr_tmp_t type, if you want to store
159 postfix qmgr temporary files in the /tmp directories.
160 Note: File context can be temporarily modified with the chcon command.
164 If you want to permanently change the file context you need to use the
165 semanage fcontext command. This will modify the SELinux labeling data‐
166 base. You will need to use restorecon to apply the labels.
167
170 semanage fcontext can also be used to manipulate default file context
171 mappings.
172 semanage permissive can also be used to manipulate whether or not a
174 process type is permissive.
175 semanage module can also be used to enable/disable/install/remove pol‐
177 icy modules.
178 semanage boolean can also be used to manipulate the booleans
180 system-config-selinux is a GUI tool available to customize SELinux pol‐
183 icy settings.
184
187 This manual page was auto-generated using sepolicy manpage .
188
191 selinux(8), postfix_qmgr(8), semanage(8), restorecon(8), chcon(1),
192 sepolicy(8), setsebool(8)
193postfix_qmgr 19-10-08 postfix_qmgr_selinux(8)