exim_selinux(8) exim SELinux Policy documentation exim_selinux(8)
NAME exim_selinux - Security Enhanced Linux Policy for the exim processes
DESCRIPTION SELinux Linux secures exim (Exim mail transfer agent) processes via flexible mandatory 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 (postgres, 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
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:
- Set files with the exim_exec_t type, if you want to transition an executable to the exim_t domain.
- Set files with the exim_initrc_exec_t type, if you want to transition an executable to the exim_initrc_t domain.
- Set files with the exim_keytab_t type, if you want to treat the files as kerberos keytab files.
- 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.
- Set files with the exim_spool_t type, if you want to store the exim files under the /var/spool directory.
- Set files with the exim_tmp_t type, if you want to store exim tempo- rary files in the /tmp directories.
- 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 permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. 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:
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 ALSO selinux(8), exim(8), semanage(8), restorecon(8), chcon(1) , setse- bool(8)
firstname.lastname@example.org exim exim_selinux(8)