exim_selinux(8) exim SELinux Policy documentation exim_selinux(8)NAMEexim_selinux - Security Enhanced Linux Policy for the exim processes
DESCRIPTION
Security-Enhanced Linux secures the exim processes via flexible manda‐
tory access control.
BOOLEANS
SELinux policy is customizable based on least access required. exim
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run exim with the tightest access possible.
If you want to allow exim to read unprivileged user files, you must
turn on the exim_read_user_files boolean.
setsebool -P exim_read_user_files 1
If you want to allow exim to connect to databases (PostgreSQL, MySQL,
you must turn on the exim_can_connect_db boolean.
setsebool -P exim_can_connect_db 1
If you want to allow exim to create, read, write, and delete unprivi‐
leged user files, you must turn on the exim_manage_user_files boolean.
setsebool -P exim_manage_user_files 1
NSSWITCH DOMAIN
If you want to allow users to login using a sssd serve for the exim_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
exim_t, you must turn on the allow_kerberos boolean.
setsebool -P allow_kerberos 1
If you want to allow system to run with NI for the exim_t, you must
turn on the allow_ypbind boolean.
setsebool -P allow_ypbind 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 exim policy is very flexible allowing users to setup their exim
processes in as secure a method as possible.
The following file types are defined for exim:
exim_exec_t
- Set files with the exim_exec_t type, if you want to transition an
executable to the exim_t domain.
Paths:
/usr/sbin/exim_tidydb, /usr/sbin/exim[0-9]?
exim_initrc_exec_t
- Set files with the exim_initrc_exec_t type, if you want to transition
an executable to the exim_initrc_t domain.
exim_keytab_t
- Set files with the exim_keytab_t type, if you want to treat the files
as kerberos keytab files.
exim_log_t
- Set files with the exim_log_t type, if you want to treat the data as
exim log data, usually stored under the /var/log directory.
exim_spool_t
- Set files with the exim_spool_t type, if you want to store the exim
files under the /var/spool directory.
exim_tmp_t
- Set files with the exim_tmp_t type, if you want to store exim tempo‐
rary files in the /tmp directories.
exim_var_run_t
- Set files with the exim_var_run_t type, if you want to store the exim
files under the /run directory.
Note: File context can be temporarily modified with the chcon command.
If you want to permanantly change the file context you need to use the
semanage fcontext command. This will modify the SELinux labeling data‐
base. You will need to use restorecon to apply the labels.
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
exim policy is very flexible allowing users to setup their exim pro‐
cesses in as secure a method as possible.
The following process types are defined for exim:
exim_t
Note: semanage permissive -a PROCESS_TYPE can be used to make a process
type permissive. Permissive process types are not denied access by
SELinux. AVC messages will still be generated.
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 autogenerated by genman.py.
SEE ALSOselinux(8), exim(8), semanage(8), restorecon(8), chcon(1) , setse‐
bool(8)dwalsh@redhat.com exim exim_selinux(8)
