system_mail_selinux - Man Page

Security Enhanced Linux Policy for the system_mail processes

Description

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

The system_mail processes execute with the system_mail_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 system_mail_t

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 psbP

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

The following process types are defined for system_mail:

system_mail_t

Note: semanage permissive -a system_mail_t can be used to make the process type system_mail_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

Booleans

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

If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.

setsebool -P fips_mode 1

If you want to determine whether Gitosis can send mail, you must turn on the gitosis_can_sendmail boolean. Disabled by default.

setsebool -P gitosis_can_sendmail 1

If you want to allow http daemon to send mail, you must turn on the httpd_can_sendmail boolean. Disabled by default.

setsebool -P httpd_can_sendmail 1

If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.

setsebool -P nis_enabled 1

If you want to allow Redis to run redis-sentinal notification scripts, you must turn on the redis_enable_notify boolean. Disabled by default.

setsebool -P redis_enable_notify 1

If you want to support ecryptfs home directories, you must turn on the use_ecryptfs_home_dirs boolean. Disabled by default.

setsebool -P use_ecryptfs_home_dirs 1

Managed Files

The SELinux process type system_mail_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

cifs_t

courier_spool_t

/var/spool/courier(/.*)?
/var/spool/authdaemon(/.*)?

ecryptfs_t

/home/[^/]+/.Private(/.*)?
/home/[^/]+/.ecryptfs(/.*)?

etc_aliases_t

/etc/mail/.*.db
/etc/mail/aliases.*
/etc/postfix/aliases.*
/etc/aliases
/etc/aliases.db

etc_mail_t

/etc/mail(/.*)?

exim_log_t

/var/log/exim[0-9]?(/.*)?

exim_spool_t

/var/spool/exim[0-9]?(/.*)?

mail_home_rw_t

/root/Maildir(/.*)?
/root/.esmtp_queue(/.*)?
/var/lib/arpwatch/.esmtp_queue(/.*)?
/home/[^/]+/.maildir(/.*)?
/home/[^/]+/Maildir(/.*)?
/home/[^/]+/.esmtp_queue(/.*)?

mail_home_t

/root/.mailrc
/root/.esmtprc
/root/.forward
/root/dead.letter
/home/[^/]+/.forward[^/]*
/home/[^/]+/.mailrc
/home/[^/]+/.esmtprc
/home/[^/]+/dead.letter

mail_spool_t

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

mqueue_spool_t

/var/spool/(client)?mqueue(/.*)?
/var/spool/mqueue.in(/.*)?

munin_var_lib_t

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

nfs_t

qmail_spool_t

/var/qmail/queue(/.*)?

sendmail_log_t

/var/log/mail(/.*)?
/var/log/sendmail.st.*

uucpd_spool_t

/var/spool/uucp(/.*)?
/var/spool/uucppublic(/.*)?

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 .

See Also

selinux(8), system_mail(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8)

Info

20-08-03 SELinux Policy system_mail