wireshark_selinux (8) - Linux Manuals
wireshark_selinux: Security Enhanced Linux Policy for the wireshark processes
NAME
wireshark_selinux - Security Enhanced Linux Policy for the wireshark processesDESCRIPTION
Security-Enhanced Linux secures the wireshark processes via flexible mandatory access control.
The wireshark processes execute with the wireshark_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 wireshark_t
ENTRYPOINTS
The wireshark_t SELinux type can be entered via the wireshark_exec_t file type.
The default entrypoint paths for the wireshark_t domain are the following:
PROCESS TYPES
SELinux defines process types (domains) for each process running on the systemYou can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux wireshark policy is very flexible allowing users to setup their wireshark processes in as secure a method as possible.
The following process types are defined for wireshark:
wireshark_t
Note: semanage permissive -a wireshark_t can be used to make the process type wireshark_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. wireshark policy is extremely flexible and has several booleans that allow you to manipulate the policy and run wireshark 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 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 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 allow regular users direct dri device access, you must turn on the selinuxuser_direct_dri_enabled boolean. Enabled by default.
setsebool -P selinuxuser_direct_dri_enabled 1
If you want to support ecryptfs home directories, you must turn on the use_ecryptfs_home_dirs boolean. Disabled by default.
setsebool -P use_ecryptfs_home_dirs 1
If you want to support fusefs home directories, you must turn on the use_fusefs_home_dirs boolean. Disabled by default.
setsebool -P use_fusefs_home_dirs 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
If you want to allows clients to write to the X server shared memory segments, you must turn on the xserver_clients_write_xshm boolean. Disabled by default.
setsebool -P xserver_clients_write_xshm 1
If you want to support X userspace object manager, you must turn on the xserver_object_manager boolean. Enabled by default.
setsebool -P xserver_object_manager 1
MANAGED FILES
The SELinux process type wireshark_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.
cifs_t
ecryptfs_t
fusefs_t
nfs_t
user_fonts_cache_t
user_home_t
wireshark_home_t
wireshark_tmp_t
wireshark_tmpfs_t
xserver_tmpfs_t
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 lsP Policy governs the access confined processes have to these files. SELinux wireshark policy is very flexible allowing users to setup their wireshark processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the wireshark, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.
semanage fcontext -a -t wireshark_tmpfs_t '/srv/mywireshark_content(/.*)?'
restorecon -R -v /srv/mywireshark_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for wireshark:
wireshark_exec_t
- Set files with the wireshark_exec_t type, if you want to transition an executable to the wireshark_t domain.
wireshark_home_t
- Set files with the wireshark_home_t type, if you want to store wireshark files in the users home directory.
wireshark_tmp_t
- Set files with the wireshark_tmp_t type, if you want to store wireshark temporary files in the /tmp directories.
wireshark_tmpfs_t
- Set files with the wireshark_tmpfs_t type, if you want to store wireshark files on a tmpfs file system.
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.
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 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.