postfix_smtpd_selinux(8)

1postfix_smtpd_selinux(8) SELinux Policy postfix_smtpd postfix_smtpd_selinux(8)
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NAME

6       postfix_smtpd_selinux  -  Security  Enhanced Linux Policy for the post‐
7       fix_smtpd processes
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DESCRIPTION

10       Security-Enhanced Linux secures the postfix_smtpd processes via  flexi‐
11       ble mandatory access control.
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13       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.
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17       For example:
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19       ps -eZ | grep postfix_smtpd_t
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ENTRYPOINTS

24       The   postfix_smtpd_t  SELinux  type  can  be  entered  via  the  post‐
25       fix_smtpd_exec_t file type.
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27       The default entrypoint paths for the  postfix_smtpd_t  domain  are  the
28       following:
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30       /usr/libexec/postfix/smtpd
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PROCESS TYPES

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_smtpd  policy  is  very  flexible allowing users to setup their
40       postfix_smtpd processes in as secure a method as possible.
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42       The following process types are defined for postfix_smtpd:
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44       postfix_smtp_t, postfix_smtpd_t
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46       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.
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BOOLEANS

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.
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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 enable reading of urandom for all domains, you must turn
115       on the global_ssp boolean. Disabled by default.
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117       setsebool -P global_ssp 1
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121       If  you  want  to allow confined applications to run with kerberos, you
122       must turn on the kerberos_enabled boolean. Enabled by default.
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124       setsebool -P kerberos_enabled 1
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128       If you want to allow system to run with  NIS,  you  must  turn  on  the
129       nis_enabled boolean. Disabled by default.
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131       setsebool -P nis_enabled 1
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135       If  you  want to allow confined applications to use nscd shared memory,
136       you must turn on the nscd_use_shm boolean. Disabled by default.
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138       setsebool -P nscd_use_shm 1
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MANAGED FILES

143       The SELinux process type postfix_smtpd_t can manage files labeled  with
144       the  following  file types.  The paths listed are the default paths for
145       these file types.  Note the processes UID still need to have  DAC  per‐
146       missions.
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148       anon_inodefs_t
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151       postfix_prng_t
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153            /etc/postfix/prng_exch
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155       postfix_smtpd_tmp_t
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158       postfix_spool_t
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160            /var/spool/postfix.*
161            /var/spool/postfix/defer(/.*)?
162            /var/spool/postfix/flush(/.*)?
163            /var/spool/postfix/deferred(/.*)?
164            /var/spool/postfix/maildrop(/.*)?
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166       postfix_var_run_t
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168            /var/spool/postfix/pid/.*
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FILE CONTEXTS

172       SELinux requires files to have an extended attribute to define the file
173       type.
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175       You can see the context of a file using the -Z option to ls
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177       Policy governs the access  confined  processes  have  to  these  files.
178       SELinux  postfix_smtpd  policy is very flexible allowing users to setup
179       their postfix_smtpd processes in as secure a method as possible.
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181       STANDARD FILE CONTEXT
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183       SELinux defines the file context types for the  postfix_smtpd,  if  you
184       wanted  to store files with these types in a diffent paths, you need to
185       execute the semanage command to sepecify alternate  labeling  and  then
186       use restorecon to put the labels on disk.
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188       semanage  fcontext -a -t postfix_smtpd_tmp_t '/srv/mypostfix_smtpd_con‐
189       tent(/.*)?'
190       restorecon -R -v /srv/mypostfix_smtpd_content
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192       Note: SELinux often uses regular expressions  to  specify  labels  that
193       match multiple files.
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195       The following file types are defined for postfix_smtpd:
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199       postfix_smtpd_exec_t
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201       -  Set files with the postfix_smtpd_exec_t type, if you want to transi‐
202       tion an executable to the postfix_smtpd_t domain.
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206       postfix_smtpd_tmp_t
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208       - Set files with the postfix_smtpd_tmp_t type, if  you  want  to  store
209       postfix smtpd temporary files in the /tmp directories.
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213       Note:  File context can be temporarily modified with the chcon command.
214       If you want to permanently change the file context you need to use  the
215       semanage fcontext command.  This will modify the SELinux labeling data‐
216       base.  You will need to use restorecon to apply the labels.
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COMMANDS

220       semanage fcontext can also be used to manipulate default  file  context
221       mappings.
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223       semanage  permissive  can  also  be used to manipulate whether or not a
224       process type is permissive.
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226       semanage module can also be used to enable/disable/install/remove  pol‐
227       icy modules.
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229       semanage boolean can also be used to manipulate the booleans
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232       system-config-selinux is a GUI tool available to customize SELinux pol‐
233       icy settings.
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AUTHOR

237       This manual page was auto-generated using sepolicy manpage .
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