1postfix_postdrop_selinux(S8E)Linux Policy postfix_postdproosptfix_postdrop_selinux(8)
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6 postfix_postdrop_selinux - Security Enhanced Linux Policy for the post‐
7 fix_postdrop processes
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10 Security-Enhanced Linux secures the postfix_postdrop processes via
11 flexible mandatory access control.
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13 The postfix_postdrop processes execute with the postfix_postdrop_t
14 SELinux type. You can check if you have these processes running by exe‐
15 cuting the ps command with the -Z qualifier.
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17 For example:
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19 ps -eZ | grep postfix_postdrop_t
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24 The postfix_postdrop_t SELinux type can be entered via the post‐
25 fix_postdrop_exec_t file type.
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27 The default entrypoint paths for the postfix_postdrop_t domain are the
28 following:
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30 /usr/sbin/postdrop
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33 SELinux defines process types (domains) for each process running on the
34 system
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36 You can see the context of a process using the -Z option to ps
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38 Policy governs the access confined processes have to files. SELinux
39 postfix_postdrop policy is very flexible allowing users to setup their
40 postfix_postdrop processes in as secure a method as possible.
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42 The following process types are defined for postfix_postdrop:
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44 postfix_postdrop_t
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46 Note: semanage permissive -a postfix_postdrop_t can be used to make the
47 process type postfix_postdrop_t permissive. SELinux does not deny
48 access to permissive process types, but the AVC (SELinux denials) mes‐
49 sages are still generated.
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53 SELinux policy is customizable based on least access required. post‐
54 fix_postdrop policy is extremely flexible and has several booleans that
55 allow you to manipulate the policy and run postfix_postdrop with the
56 tightest access possible.
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60 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.
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64 setsebool -P authlogin_nsswitch_use_ldap 1
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68 If you want to deny any process from ptracing or debugging any other
69 processes, you must turn on the deny_ptrace boolean. Enabled by
70 default.
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72 setsebool -P deny_ptrace 1
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76 If you want to allow any process to mmap any file on system with
77 attribute file_type, you must turn on the domain_can_mmap_files bool‐
78 ean. Enabled by default.
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80 setsebool -P domain_can_mmap_files 1
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84 If you want to allow all domains write to kmsg_device, while kernel is
85 executed with systemd.log_target=kmsg parameter, you must turn on the
86 domain_can_write_kmsg boolean. Disabled by default.
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88 setsebool -P domain_can_write_kmsg 1
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92 If you want to allow all domains to use other domains file descriptors,
93 you must turn on the domain_fd_use boolean. Enabled by default.
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95 setsebool -P domain_fd_use 1
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99 If you want to allow all domains to have the kernel load modules, you
100 must turn on the domain_kernel_load_modules boolean. Disabled by
101 default.
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103 setsebool -P domain_kernel_load_modules 1
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107 If you want to allow all domains to execute in fips_mode, you must turn
108 on the fips_mode boolean. Enabled by default.
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110 setsebool -P fips_mode 1
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114 If you want to determine whether Gitosis can send mail, you must turn
115 on the gitosis_can_sendmail boolean. Disabled by default.
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117 setsebool -P gitosis_can_sendmail 1
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121 If you want to enable reading of urandom for all domains, you must turn
122 on the global_ssp boolean. Disabled by default.
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124 setsebool -P global_ssp 1
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128 If you want to allow http daemon to send mail, you must turn on the
129 httpd_can_sendmail boolean. Disabled by default.
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131 setsebool -P httpd_can_sendmail 1
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135 If you want to allow confined applications to run with kerberos, you
136 must turn on the kerberos_enabled boolean. Enabled by default.
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138 setsebool -P kerberos_enabled 1
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142 If you want to allow system to run with NIS, you must turn on the
143 nis_enabled boolean. Disabled by default.
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145 setsebool -P nis_enabled 1
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149 If you want to allow confined applications to use nscd shared memory,
150 you must turn on the nscd_use_shm boolean. Disabled by default.
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152 setsebool -P nscd_use_shm 1
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156 If you want to allow Redis to run redis-sentinal notification scripts,
157 you must turn on the redis_enable_notify boolean. Disabled by default.
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159 setsebool -P redis_enable_notify 1
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164 The SELinux process type postfix_postdrop_t can manage files labeled
165 with the following file types. The paths listed are the default paths
166 for these file types. Note the processes UID still need to have DAC
167 permissions.
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169 anon_inodefs_t
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172 arpwatch_tmp_t
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175 postfix_spool_t
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177 /var/spool/postfix.*
178 /var/spool/postfix/defer(/.*)?
179 /var/spool/postfix/flush(/.*)?
180 /var/spool/postfix/deferred(/.*)?
181 /var/spool/postfix/maildrop(/.*)?
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183 postfix_var_run_t
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185 /var/spool/postfix/pid/.*
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187 uucpd_spool_t
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189 /var/spool/uucp(/.*)?
190 /var/spool/uucppublic(/.*)?
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194 SELinux requires files to have an extended attribute to define the file
195 type.
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197 You can see the context of a file using the -Z option to ls
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199 Policy governs the access confined processes have to these files.
200 SELinux postfix_postdrop policy is very flexible allowing users to set‐
201 up their postfix_postdrop processes in as secure a method as possible.
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203 STANDARD FILE CONTEXT
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205 SELinux defines the file context types for the postfix_postdrop, if you
206 wanted to store files with these types in a diffent paths, you need to
207 execute the semanage command to sepecify alternate labeling and then
208 use restorecon to put the labels on disk.
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210 semanage fcontext -a -t postfix_postdrop_t '/srv/mypostfix_post‐
211 drop_content(/.*)?'
212 restorecon -R -v /srv/mypostfix_postdrop_content
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214 Note: SELinux often uses regular expressions to specify labels that
215 match multiple files.
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217 The following file types are defined for postfix_postdrop:
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221 postfix_postdrop_exec_t
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223 - Set files with the postfix_postdrop_exec_t type, if you want to tran‐
224 sition an executable to the postfix_postdrop_t domain.
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228 postfix_postdrop_t
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230 - Set files with the postfix_postdrop_t type, if you want to treat the
231 files as postfix postdrop data.
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235 Note: File context can be temporarily modified with the chcon command.
236 If you want to permanently change the file context you need to use the
237 semanage fcontext command. This will modify the SELinux labeling data‐
238 base. You will need to use restorecon to apply the labels.
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242 semanage fcontext can also be used to manipulate default file context
243 mappings.
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245 semanage permissive can also be used to manipulate whether or not a
246 process type is permissive.
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248 semanage module can also be used to enable/disable/install/remove pol‐
249 icy modules.
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251 semanage boolean can also be used to manipulate the booleans
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254 system-config-selinux is a GUI tool available to customize SELinux pol‐
255 icy settings.
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259 This manual page was auto-generated using sepolicy manpage .
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263 selinux(8), postfix_postdrop(8), semanage(8), restorecon(8), chcon(1),
264 sepolicy(8) , setsebool(8)
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268postfix_postdrop 19-04-25 postfix_postdrop_selinux(8)