1postfix_smtpd_selinux(8) SELinux Policy postfix_smtpd postfix_smtpd_selinux(8)
2
6 postfix_smtpd_selinux - Security Enhanced Linux Policy for the post‐
7 fix_smtpd processes
8
10 Security-Enhanced Linux secures the postfix_smtpd processes via flexi‐
11 ble mandatory access control.
12 The postfix_smtpd processes execute with the postfix_smtpd_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_smtpd_t
20
24 The postfix_smtpd_t SELinux type can be entered via the post‐
25 fix_smtpd_exec_t file type.
26 The default entrypoint paths for the postfix_smtpd_t domain are the
28 following:
29 /usr/libexec/postfix/smtpd
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_smtpd policy is very flexible allowing users to setup their
40 postfix_smtpd processes in as secure a method as possible.
41 The following process types are defined for postfix_smtpd:
43 postfix_smtpd_t, postfix_smtp_t
45 Note: semanage permissive -a postfix_smtpd_t can be used to make the
47 process type postfix_smtpd_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_smtpd policy is extremely flexible and has several booleans that
55 allow you to manipulate the policy and run postfix_smtpd 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
118 The SELinux process type postfix_smtpd_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_prng_t
144 /etc/postfix/prng_exch
146 postfix_smtpd_tmp_t
148 postfix_spool_t
151 /var/spool/postfix.*
153 postfix_var_run_t
155 /var/spool/postfix/pid/.*
157 tmp_t
159 /tmp
161 /usr/tmp
162 /var/tmp
163 /tmp-inst
164 /var/tmp-inst
165 /var/tmp/vi.recover
166
169 SELinux requires files to have an extended attribute to define the file
170 type.
171 You can see the context of a file using the -Z option to ls
173 Policy governs the access confined processes have to these files.
175 SELinux postfix_smtpd policy is very flexible allowing users to setup
176 their postfix_smtpd processes in as secure a method as possible.
177 STANDARD FILE CONTEXT
179 SELinux defines the file context types for the postfix_smtpd, if you
181 wanted to store files with these types in a diffent paths, you need to
182 execute the semanage command to sepecify alternate labeling and then
183 use restorecon to put the labels on disk.
184 semanage fcontext -a -t postfix_smtpd_tmp_t '/srv/mypostfix_smtpd_con‐
186 tent(/.*)?'
187 restorecon -R -v /srv/mypostfix_smtpd_content
188 Note: SELinux often uses regular expressions to specify labels that
190 match multiple files.
191 The following file types are defined for postfix_smtpd:
193 postfix_smtpd_exec_t
197 - Set files with the postfix_smtpd_exec_t type, if you want to transi‐
199 tion an executable to the postfix_smtpd_t domain.
200 postfix_smtpd_tmp_t
204 - Set files with the postfix_smtpd_tmp_t type, if you want to store
206 postfix smtpd temporary files in the /tmp directories.
207 Note: File context can be temporarily modified with the chcon command.
211 If you want to permanently change the file context you need to use the
212 semanage fcontext command. This will modify the SELinux labeling data‐
213 base. You will need to use restorecon to apply the labels.
214
217 semanage fcontext can also be used to manipulate default file context
218 mappings.
219 semanage permissive can also be used to manipulate whether or not a
221 process type is permissive.
222 semanage module can also be used to enable/disable/install/remove pol‐
224 icy modules.
225 semanage boolean can also be used to manipulate the booleans
227 system-config-selinux is a GUI tool available to customize SELinux pol‐
230 icy settings.
231
234 This manual page was auto-generated using sepolicy manpage .
235
238 selinux(8), postfix_smtpd(8), semanage(8), restorecon(8), chcon(1) ,
239 setsebool(8)
240postfix_smtpd 15-06-03 postfix_smtpd_selinux(8)