1postfix_qmgr_selinux(8) SELinux Policy postfix_qmgr postfix_qmgr_selinux(8)
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6 postfix_qmgr_selinux - Security Enhanced Linux Policy for the post‐
7 fix_qmgr processes
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10 Security-Enhanced Linux secures the postfix_qmgr processes via flexible
11 mandatory access control.
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13 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.
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17 For example:
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19 ps -eZ | grep postfix_qmgr_t
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24 The postfix_qmgr_t SELinux type can be entered via the post‐
25 fix_qmgr_exec_t file type.
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27 The default entrypoint paths for the postfix_qmgr_t domain are the fol‐
28 lowing:
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30 /usr/libexec/postfix/(n)?qmgr
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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_qmgr policy is very flexible allowing users to setup their
40 postfix_qmgr processes in as secure a method as possible.
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42 The following process types are defined for postfix_qmgr:
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44 postfix_qmgr_t
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46 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.
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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.
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60 If you want to allow all domains to execute in fips_mode, you must turn
61 on the fips_mode boolean. Enabled by default.
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63 setsebool -P fips_mode 1
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67 If you want to allow system to run with NIS, you must turn on the
68 nis_enabled boolean. Disabled by default.
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70 setsebool -P nis_enabled 1
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75 The SELinux process type postfix_qmgr_t can manage files labeled with
76 the following file types. The paths listed are the default paths for
77 these file types. Note the processes UID still need to have DAC per‐
78 missions.
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80 anon_inodefs_t
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83 postfix_spool_t
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85 /var/spool/postfix.*
86 /var/spool/postfix/defer(/.*)?
87 /var/spool/postfix/flush(/.*)?
88 /var/spool/postfix/deferred(/.*)?
89 /var/spool/postfix/maildrop(/.*)?
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91 postfix_var_run_t
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93 /var/spool/postfix/pid/.*
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97 SELinux requires files to have an extended attribute to define the file
98 type.
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100 You can see the context of a file using the -Z option to ls
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102 Policy governs the access confined processes have to these files.
103 SELinux postfix_qmgr policy is very flexible allowing users to setup
104 their postfix_qmgr processes in as secure a method as possible.
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106 STANDARD FILE CONTEXT
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108 SELinux defines the file context types for the postfix_qmgr, if you
109 wanted to store files with these types in a diffent paths, you need to
110 execute the semanage command to sepecify alternate labeling and then
111 use restorecon to put the labels on disk.
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113 semanage fcontext -a -t postfix_qmgr_tmp_t '/srv/mypostfix_qmgr_con‐
114 tent(/.*)?'
115 restorecon -R -v /srv/mypostfix_qmgr_content
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117 Note: SELinux often uses regular expressions to specify labels that
118 match multiple files.
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120 The following file types are defined for postfix_qmgr:
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124 postfix_qmgr_exec_t
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126 - Set files with the postfix_qmgr_exec_t type, if you want to transi‐
127 tion an executable to the postfix_qmgr_t domain.
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131 postfix_qmgr_tmp_t
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133 - Set files with the postfix_qmgr_tmp_t type, if you want to store
134 postfix qmgr temporary files in the /tmp directories.
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138 Note: File context can be temporarily modified with the chcon command.
139 If you want to permanently change the file context you need to use the
140 semanage fcontext command. This will modify the SELinux labeling data‐
141 base. You will need to use restorecon to apply the labels.
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145 semanage fcontext can also be used to manipulate default file context
146 mappings.
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148 semanage permissive can also be used to manipulate whether or not a
149 process type is permissive.
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151 semanage module can also be used to enable/disable/install/remove pol‐
152 icy modules.
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154 semanage boolean can also be used to manipulate the booleans
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157 system-config-selinux is a GUI tool available to customize SELinux pol‐
158 icy settings.
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162 This manual page was auto-generated using sepolicy manpage .
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166 selinux(8), postfix_qmgr(8), semanage(8), restorecon(8), chcon(1),
167 sepolicy(8), setsebool(8)
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171postfix_qmgr 21-03-26 postfix_qmgr_selinux(8)