1postfix_virtual_selinux(8S)ELinux Policy postfix_virtuaplostfix_virtual_selinux(8)
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6 postfix_virtual_selinux - Security Enhanced Linux Policy for the post‐
7 fix_virtual processes
8
10 Security-Enhanced Linux secures the postfix_virtual processes via flex‐
11 ible mandatory access control.
12 The postfix_virtual processes execute with the postfix_virtual_t
14 SELinux type. You can check if you have these processes running by exe‐
15 cuting the ps command with the -Z qualifier.
16 For example:
18 ps -eZ | grep postfix_virtual_t
20
24 The postfix_virtual_t SELinux type can be entered via the postfix_vir‐
25 tual_exec_t file type.
26 The default entrypoint paths for the postfix_virtual_t domain are the
28 following:
29 /usr/libexec/postfix/virtual
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_virtual policy is very flexible allowing users to setup their
40 postfix_virtual processes in as secure a method as possible.
41 The following process types are defined for postfix_virtual:
43 postfix_virtual_t
45 Note: semanage permissive -a postfix_virtual_t can be used to make the
47 process type postfix_virtual_t permissive. SELinux does not deny access
48 to 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_virtual policy is extremely flexible and has several booleans that
55 allow you to manipulate the policy and run postfix_virtual with the
56 tightest 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 If you want to support NFS home directories, you must turn on the
118 use_nfs_home_dirs boolean. Disabled by default.
119 setsebool -P use_nfs_home_dirs 1
121 If you want to support SAMBA home directories, you must turn on the
125 use_samba_home_dirs boolean. Disabled by default.
126 setsebool -P use_samba_home_dirs 1
128
132 The SELinux process type postfix_virtual_t can manage files labeled
133 with the following file types. The paths listed are the default paths
134 for these file types. Note the processes UID still need to have DAC
135 permissions.
136 anon_inodefs_t
138 cifs_t
141 dovecot_spool_t
144 /var/spool/dovecot(/.*)?
146 initrc_tmp_t
148 mail_spool_t
151 /var/mail(/.*)?
153 /var/spool/mail(/.*)?
154 /var/spool/imap(/.*)?
155 mnt_t
157 /mnt(/[^/]*)
159 /mnt(/[^/]*)?
160 /rhev(/[^/]*)?
161 /media(/[^/]*)
162 /media(/[^/]*)?
163 /etc/rhgb(/.*)?
164 /media/.hal-.*
165 /net
166 /afs
167 /rhev
168 /misc
169 nfs_t
171 postfix_spool_t
174 /var/spool/postfix.*
176 postfix_var_run_t
178 /var/spool/postfix/pid/.*
180 postfix_virtual_tmp_t
182 tmp_t
185 /tmp
187 /usr/tmp
188 /var/tmp
189 /tmp-inst
190 /var/tmp-inst
191 /var/tmp/vi.recover
192 user_home_t
194 /home/[^/]*/.+
196 /home/staff/.+
197 user_home_type
199 all user home files
201
204 SELinux requires files to have an extended attribute to define the file
205 type.
206 You can see the context of a file using the -Z option to ls
208 Policy governs the access confined processes have to these files.
210 SELinux postfix_virtual policy is very flexible allowing users to setup
211 their postfix_virtual processes in as secure a method as possible.
212 STANDARD FILE CONTEXT
214 SELinux defines the file context types for the postfix_virtual, if you
216 wanted to store files with these types in a diffent paths, you need to
217 execute the semanage command to sepecify alternate labeling and then
218 use restorecon to put the labels on disk.
219 semanage fcontext -a -t postfix_virtual_tmp_t '/srv/mypostfix_vir‐
221 tual_content(/.*)?'
222 restorecon -R -v /srv/mypostfix_virtual_content
223 Note: SELinux often uses regular expressions to specify labels that
225 match multiple files.
226 The following file types are defined for postfix_virtual:
228 postfix_virtual_exec_t
232 - Set files with the postfix_virtual_exec_t type, if you want to tran‐
234 sition an executable to the postfix_virtual_t domain.
235 postfix_virtual_tmp_t
239 - Set files with the postfix_virtual_tmp_t type, if you want to store
241 postfix virtual temporary files in the /tmp directories.
242 Note: File context can be temporarily modified with the chcon command.
246 If you want to permanently change the file context you need to use the
247 semanage fcontext command. This will modify the SELinux labeling data‐
248 base. You will need to use restorecon to apply the labels.
249
252 semanage fcontext can also be used to manipulate default file context
253 mappings.
254 semanage permissive can also be used to manipulate whether or not a
256 process type is permissive.
257 semanage module can also be used to enable/disable/install/remove pol‐
259 icy modules.
260 semanage boolean can also be used to manipulate the booleans
262 system-config-selinux is a GUI tool available to customize SELinux pol‐
265 icy settings.
266
269 This manual page was auto-generated using sepolicy manpage .
270
273 selinux(8), postfix_virtual(8), semanage(8), restorecon(8), chcon(1) ,
274 setsebool(8)
275postfix_virtual 15-06-03 postfix_virtual_selinux(8)