Security-Enhanced Linux secures the mscan processes via flexible mandatory access control.
If you want to allow clamscan to read user content, you must turn on the clamscan_read_user_content boolean.
setsebool -P clamscan_read_user_content 1
If you want to allow clamscan to non security files on a system, you must turn on the clamscan_can_scan_system boolean.
setsebool -P clamscan_can_scan_system 1
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd serve for the mscan_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 mscan_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux mscan policy is very flexible allowing users to setup their mscan processes in as secure a method as possible.
The following file types are defined for mscan:
mscan_etc_t
- Set files with the mscan_etc_t type, if you want to store mscan files in the /etc directories.
mscan_exec_t
- Set files with the mscan_exec_t type, if you want to transition an executable to the mscan_t domain.
mscan_initrc_exec_t
- Set files with the mscan_initrc_exec_t type, if you want to transition an executable to the mscan_initrc_t domain.
mscan_tmp_t
- Set files with the mscan_tmp_t type, if you want to store mscan temporary files in the /tmp directories.
mscan_var_run_t
- Set files with the mscan_var_run_t type, if you want to store the mscan 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.
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux mscan policy is very flexible allowing users to setup their mscan processes in as secure a method as possible.
The following process types are defined for mscan:
mscan_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.
The SELinux user type mscan_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.
clamd_var_run_t
/var/run/clamd.*
/var/run/clamav.*
/var/run/amavis(d)?/clamd.pid
/var/spool/MailScanner(/.*)?
/var/spool/amavisd/clamd.sock
mqueue_spool_t
/var/spool/(client)?mqueue(/.*)?
/var/spool/mqueue.in(/.*)?
mscan_tmp_t
mscan_var_run_t
/var/run/MailScanner.pid