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 all domains to use other domains file descriptors,
61 you must turn on the allow_domain_fd_use boolean. Enabled by default.
62 setsebool -P allow_domain_fd_use 1
64 If you want to allow confined applications to run with kerberos, you
68 must turn on the allow_kerberos boolean. Enabled by default.
69 setsebool -P allow_kerberos 1
71 If you want to allow sysadm to debug or ptrace all processes, you must
75 turn on the allow_ptrace boolean. Disabled by default.
76 setsebool -P allow_ptrace 1
78 If you want to allow system to run with NIS, you must turn on the
82 allow_ypbind boolean. Disabled by default.
83 setsebool -P allow_ypbind 1
85 If you want to allow all domains to have the kernel load modules, you
89 must turn on the domain_kernel_load_modules boolean. Disabled by
90 default.
91 setsebool -P domain_kernel_load_modules 1
93 If you want to allow all domains to execute in fips_mode, you must turn
97 on the fips_mode boolean. Enabled by default.
98 setsebool -P fips_mode 1
100 If you want to enable reading of urandom for all domains, you must turn
104 on the global_ssp boolean. Disabled by default.
105 setsebool -P global_ssp 1
107 If you want to allow confined applications to use nscd shared memory,
111 you must turn on the nscd_use_shm boolean. Enabled by default.
112 setsebool -P nscd_use_shm 1
114
118 The SELinux process type postfix_qmgr_t can manage files labeled with
119 the following file types. The paths listed are the default paths for
120 these file types. Note the processes UID still need to have DAC per‐
121 missions.
122 anon_inodefs_t
124 initrc_tmp_t
127 mnt_t
130 /mnt(/[^/]*)
132 /mnt(/[^/]*)?
133 /rhev(/[^/]*)?
134 /media(/[^/]*)
135 /media(/[^/]*)?
136 /etc/rhgb(/.*)?
137 /media/.hal-.*
138 /net
139 /afs
140 /rhev
141 /misc
142 postfix_qmgr_tmp_t
144 postfix_spool_maildrop_t
147 /var/spool/postfix/defer(/.*)?
149 /var/spool/postfix/deferred(/.*)?
150 /var/spool/postfix/maildrop(/.*)?
151 postfix_spool_t
153 /var/spool/postfix.*
155 postfix_var_run_t
157 /var/spool/postfix/pid/.*
159 tmp_t
161 /tmp
163 /usr/tmp
164 /var/tmp
165 /tmp-inst
166 /var/tmp-inst
167 /var/tmp/vi.recover
168
171 SELinux requires files to have an extended attribute to define the file
172 type.
173 You can see the context of a file using the -Z option to ls
175 Policy governs the access confined processes have to these files.
177 SELinux postfix_qmgr policy is very flexible allowing users to setup
178 their postfix_qmgr processes in as secure a method as possible.
179 STANDARD FILE CONTEXT
181 SELinux defines the file context types for the postfix_qmgr, if you
183 wanted to store files with these types in a diffent paths, you need to
184 execute the semanage command to sepecify alternate labeling and then
185 use restorecon to put the labels on disk.
186 semanage fcontext -a -t postfix_qmgr_tmp_t '/srv/mypostfix_qmgr_con‐
188 tent(/.*)?'
189 restorecon -R -v /srv/mypostfix_qmgr_content
190 Note: SELinux often uses regular expressions to specify labels that
192 match multiple files.
193 The following file types are defined for postfix_qmgr:
195 postfix_qmgr_exec_t
199 - Set files with the postfix_qmgr_exec_t type, if you want to transi‐
201 tion an executable to the postfix_qmgr_t domain.
202 postfix_qmgr_tmp_t
206 - Set files with the postfix_qmgr_tmp_t type, if you want to store
208 postfix qmgr temporary files in the /tmp directories.
209 Note: File context can be temporarily modified with the chcon command.
213 If you want to permanently change the file context you need to use the
214 semanage fcontext command. This will modify the SELinux labeling data‐
215 base. You will need to use restorecon to apply the labels.
216
219 semanage fcontext can also be used to manipulate default file context
220 mappings.
221 semanage permissive can also be used to manipulate whether or not a
223 process type is permissive.
224 semanage module can also be used to enable/disable/install/remove pol‐
226 icy modules.
227 semanage boolean can also be used to manipulate the booleans
229 system-config-selinux is a GUI tool available to customize SELinux pol‐
232 icy settings.
233
236 This manual page was auto-generated using sepolicy manpage .
237
240 selinux(8), postfix_qmgr(8), semanage(8), restorecon(8), chcon(1) ,
241 setsebool(8)
242postfix_qmgr 15-06-03 postfix_qmgr_selinux(8)