system_mail_selinux(8) SELinux Policy system_mail system_mail_selinux(8)NAMEsystem_mail_selinux - Security Enhanced Linux Policy for the sys‐
tem_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
ENTRYPOINTS
The system_mail_t SELinux type can be entered via the mta_exec_type,
sendmail_exec_t file types.
The default entrypoint paths for the system_mail_t domain are the fol‐
lowing:
/bin/mail(x)?, /usr/bin/mail(x)?, /usr/sbin/sendmail(.sendmail)?,
/usr/bin/esmtp, /usr/sbin/rmail, /usr/sbin/ssmtp, /usr/lib/sendmail,
/var/qmail/bin/sendmail, /usr/sbin/sendmail.postfix,
/usr/lib/courier/bin/sendmail
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 sys‐
tem_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. sys‐
tem_mail policy is extremely flexible and has several booleans that
allow you to manipulate the policy and run system_mail with the tight‐
est access possible.
If you want to allow users to resolve user passwd entries directly from
ldap rather then using a sssd server, you must turn on the authlo‐
gin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to deny any process from ptracing or debugging any other
processes, you must turn on the deny_ptrace boolean. Enabled by
default.
setsebool -P deny_ptrace 1
If you want to allow all domains to use other domains file descriptors,
you must turn on the domain_fd_use boolean. Enabled by default.
setsebool -P domain_fd_use 1
If you want to allow all domains to have the kernel load modules, you
must turn on the domain_kernel_load_modules boolean. Disabled by
default.
setsebool -P domain_kernel_load_modules 1
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 enable reading of urandom for all domains, you must turn
on the global_ssp boolean. Disabled by default.
setsebool -P global_ssp 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 confined applications to run with kerberos, you
must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 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 confined applications to use nscd shared memory,
you must turn on the nscd_use_shm boolean. Disabled by default.
setsebool -P nscd_use_shm 1
NSSWITCH DOMAIN
If you want to allow users to resolve user passwd entries directly from
ldap rather then using a sssd server for the system_mail_t, you must
turn on the authlogin_nsswitch_use_ldap boolean.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow confined applications to run with kerberos for the
system_mail_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 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 per‐
missions.
anon_inodefs_t
arpwatch_tmp_t
courier_spool_t
/var/spool/courier(/.*)?
/var/spool/authdaemon(/.*)?
etc_aliases_t
/etc/mail/.*.db
/etc/mail/aliases.*
/etc/postfix/aliases.*
/etc/aliases
/etc/aliases.db
exim_log_t
/var/log/exim[0-9]?(/.*)?
exim_spool_t
/var/spool/exim[0-9]?(/.*)?
mail_home_rw_t
/root/Maildir(/.*)?
/home/[^/]*/.maildir(/.*)?
/home/[^/]*/Maildir(/.*)?
mail_home_t
/root/.mailrc
/root/.forward
/root/dead.letter
/root/.esmtp_queue
/home/[^/]*/.forward[^/]*
/home/[^/]*/.mailrc
/home/[^/]*/dead.letter
/home/[^/]*/.esmtp_queue
mail_spool_t
/var/mail(/.*)?
/var/spool/imap(/.*)?
/var/spool/mail(/.*)?
mqueue_spool_t
/var/spool/(client)?mqueue(/.*)?
/var/spool/mqueue.in(/.*)?
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(/.*)?
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 pol‐
icy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux pol‐
icy settings.
AUTHOR
This manual page was auto-generated using sepolicy manpage .
SEE ALSOselinux(8), system_mail(8), semanage(8), restorecon(8), chcon(1),
sepolicy(8) , setsebool(8)system_mail 13-11-20 system_mail_selinux(8)
