postfix_local_selinux(8) - Linux man page

Name

postfix_local_selinux - Security Enhanced Linux Policy for the postfix_local processes

Description

Security-Enhanced Linux secures the postfix_local processes via flexible mandatory access control.

The postfix_local processes execute with the postfix_local_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.

For example:

ps -eZ | grep postfix_local_t

Entrypoints

The postfix_local_t SELinux type can be entered via the "postfix_local_exec_t" file type. The default entrypoint paths for the postfix_local_t domain are the following:"

/usr/libexec/postfix/local

Process Types

SELinux defines process types (domains) for each process running on the system

You can see the context of a process using the -Z option to ps

Policy governs the access confined processes have to files. SELinux postfix_local policy is very flexible allowing users to setup their postfix_local processes in as secure a method as possible.

The following process types are defined for postfix_local:

postfix_local_t

Note: semanage permissive -a postfix_local_t

can be used to make the process type postfix_local_t permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.

Booleans

SELinux policy is customizable based on least access required. postfix_local policy is extremely flexible and has several booleans that allow you to manipulate the policy and run postfix_local with the tightest access possible.

If you want to allow postfix_local domain full write access to mail_spool directories, you must turn on the allow_postfix_local_write_mail_spool boolean.

setsebool -P allow_postfix_local_write_mail_spool 1

If you want to allow postfix_local domain full write access to mail_spool directories, you must turn on the allow_postfix_local_write_mail_spool boolean.

setsebool -P allow_postfix_local_write_mail_spool 1

File Contexts

SELinux requires files to have an extended attribute to define the file type.

You can see the context of a file using the -Z option to ls

Policy governs the access confined processes have to these files. SELinux postfix_local policy is very flexible allowing users to setup their postfix_local processes in as secure a method as possible.

The following file types are defined for postfix_local:

postfix_local_exec_t

- Set files with the postfix_local_exec_t type, if you want to transition an executable to the postfix_local_t domain.

postfix_local_tmp_t

- Set files with the postfix_local_tmp_t type, if you want to store postfix local temporary files in the /tmp directories.

Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.

Managed Files

The SELinux process type postfix_local_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.

anon_inodefs_t

dovecot_spool_t

/var/spool/dovecot(/.*)?

initrc_tmp_t
mail_home_rw_t

/root/Maildir(/.*)?

/home/[^/]*/Maildir(/.*)?

mail_spool_t

/var/mail(/.*)?

/var/spool/imap(/.*)?

/var/spool/mail(/.*)?

mailman_data_t

/etc/mailman(/.*)?

/var/lib/mailman(/.*)?

/var/spool/mailman(/.*)?

mnt_t

/mnt(/[^/]*)

/mnt(/[^/]*)?

/rhev(/[^/]*)?

/media(/[^/]*)

/media(/[^/]*)?

/etc/rhgb(/.*)?

/media/.hal-.*

/net

/afs

/misc

/rhev

nfs_t
postfix_local_tmp_t
postfix_spool_t

/var/spool/postfix.*

postfix_var_run_t

/var/spool/postfix/pid/.*

tmp_t

/tmp

/usr/tmp

/var/tmp

/var/tmp/vi.recover

user_home_t

/home/[^/]*/.+

Commands

semanage fcontext can also be used to manipulate default file context mappings.

semanage permissive can also be used to manipulate whether or not a process type is permissive.

semanage module can also be used to enable/disable/install/remove policy modules.

semanage boolean can also be used to manipulate the booleans

system-config-selinux is a GUI tool available to customize SELinux policy settings.

Author

This manual page was auto-generated using sepolicy manpage by mgrepl.