system_mail_selinux(8)

💌 system_mail_selinux(8) — the system_mail SELinux policy page, bestie edition

okay so this is the manual for system_mail_selinux, straight out of the SELinux Policy system_mail corner of the universe. pull up a chair, grab a strawberry 🍓, and let's get into it.

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✨ NAME ✨

system_mail_selinux — Security Enhanced Linux Policy for the system_mail processes. that's the whole vibe. it's the policy that keeps your mail-ish processes in line 💅

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the system_mail processes via flexible mandatory access control. yes ma'am, MAC. it's giving "we don't trust you, but we love you" 🫶

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

literally just peek at your process list with -Z and grep for the type. iykyk.

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🦋 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 system_mail policy is very flexible, allowing users to setup their system_mail processes in as secure a method as possible. iconic behaviour honestly 👑

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. so like, you're not blocking anything anymore, but the receipts still get printed 😭

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🎀 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. main character energy for minimal permissions, fr fr.

• 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 allow rtorrent to use send mails, you must turn on the rtorrent_send_mails boolean. Disabled by default.

setsebool -P rtorrent_send_mails 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

the -P is doing the heavy lifting so your boolean actually persists, bestie. don't skip it 💀

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🌈 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 process's UID still needs to have DAC permissions — SELinux isn't out here overriding your normal perms, sorry 😭

• arpwatch_tmp_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/aliases.lmdb

• etc_mail_t

/etc/mail(/.*)?

• exim_log_t

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

• exim_spool_t

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

• krb5_host_rcache_t

/var/tmp/krb5_0.rcache2
/var/cache/krb5rcache(/.*)?
/var/tmp/nfs_0
/var/tmp/DNS_25
/var/tmp/host_0
/var/tmp/imap_0
/var/tmp/HTTP_23
/var/tmp/HTTP_48
/var/tmp/ldap_55
/var/tmp/ldap_487
/var/tmp/ldapmap1_0

• mail_home_rw_t

/root/Maildir(/.*)?
/root/.esmtp_queue(/.*)?
/var/lib/arpwatch/.esmtp_queue(/.*)?
/var/cache/ddclient/.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.*

• system_mail_tmp_t
• uucpd_spool_t

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

look at that list. a whole buffet of file types 🍓 and yeah, some of them (arpwatch_tmp_t, cifs_t, nfs_t, system_mail_tmp_t) are listed with no default paths — that's just how it is, no cap.

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💅 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. yes, a GUI. for the girlies who like a little clicking with their policy 💖

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⭐ AUTHOR ⭐

This manual page was auto-generated using sepolicy manpage. (a robot wrote it, i just gave it a makeover 💅)

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🔥 SEE ALSO 🔥

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

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and that's the whole page, bestie! 🫶 this beauty came from the system_mail package, dated 26-10-06, and it's page system_mail_selinux(8) — go forth and mail responsibly ✨💌