One Hat Cyber Team

Edit File: system_mail.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="Content-Style" content="text/css">
<style type="text/css">
 p { margin-top: 0; margin-bottom: 0; vertical-align: top }
 pre { margin-top: 0; margin-bottom: 0; vertical-align: top }
 table { margin-top: 0; margin-bottom: 0; vertical-align: top }
 h1 { text-align: center }
</style>
<title>system_mail_selinux</title>

</head>
<body>

<h1 align="center">system_mail_selinux</h1>

<a href="#NAME">NAME</a> 
<a href="#DESCRIPTION">DESCRIPTION</a> 
<a href="#ENTRYPOINTS">ENTRYPOINTS</a> 
<a href="#PROCESS TYPES">PROCESS TYPES</a> 
<a href="#BOOLEANS">BOOLEANS</a> 
<a href="#MANAGED FILES">MANAGED FILES</a> 
<a href="#COMMANDS">COMMANDS</a> 
<a href="#AUTHOR">AUTHOR</a> 
<a href="#SEE ALSO">SEE ALSO</a>

<hr>

system_mail_selinux
&minus; Security Enhanced Linux Policy for the system_mail
processes

<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>

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 &minus;Z
qualifier.

For
example:

ps -eZ |
grep system_mail_t

<h2>ENTRYPOINTS
<a name="ENTRYPOINTS"></a>
</h2>

The
system_mail_t SELinux type can be entered via the
sendmail_exec_t, mta_exec_type file types.

The default
entrypoint paths for the system_mail_t domain are the
following:

/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

<h2>PROCESS TYPES
<a name="PROCESS TYPES"></a>
</h2>

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

You can see the
context of a process using the &minus;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.

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.

<h2>BOOLEANS
<a name="BOOLEANS"></a>
</h2>

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 users to resolve user passwd entries directly from
ldap rather then using a sssd server, you must turn on the
authlogin_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

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

setsebool -P
use_nfs_home_dirs 1

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

setsebool -P
use_samba_home_dirs 1

<h2>MANAGED FILES
<a name="MANAGED FILES"></a>
</h2>

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

arpwatch_tmp_t

cifs_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(/.*)?
 
/root/.esmtp_queue(/.*)? 
/home/[^/]*/.maildir(/.*)? 
/home/[^/]*/Maildir(/.*)? 
/home/[^/]*/.esmtp_queue(/.*)?

mail_home_t

/root/.mailrc
 
/root/.forward 
/root/dead.letter 
/home/[^/]*/.forward[^/]* 
/home/[^/]*/.mailrc 
/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(/.*)?

<h2>COMMANDS
<a name="COMMANDS"></a>
</h2>

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.

<h2>AUTHOR
<a name="AUTHOR"></a>
</h2>

This manual
page was auto-generated using sepolicy manpage .

selinux(8),
system_mail(8), semanage(8), restorecon(8), chcon(1),
sepolicy(8) , setsebool(8)
<hr>
</body>
</html>