sandbox_selinux(8) SELinux Policy sandbox sandbox_selinux(8)NAMEsandbox_selinux - Security Enhanced Linux Policy for the sandbox pro‐
cesses
DESCRIPTION
Security-Enhanced Linux secures the sandbox processes via flexible
mandatory access control.
The sandbox processes execute with the sandbox_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 sandbox_t
ENTRYPOINTS
The sandbox_t SELinux type can be entered via the file_type file type.
The default entrypoint paths for the sandbox_t domain are the follow‐
ing:
all files on the system
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
sandbox policy is very flexible allowing users to setup their sandbox
processes in as secure a method as possible.
The following process types are defined for sandbox:
sandbox_x_client_t, sandbox_net_client_t, sandbox_xserver_t, sandbox_x_t, sandbox_web_client_t, sandbox_min_t, sandbox_net_t, sandbox_web_t, sandbox_min_client_t, sandbox_t
Note: semanage permissive -a sandbox_t can be used to make the process
type sandbox_t permissive. SELinux does not deny access to permissive
process types, but the AVC (SELinux denials) messages are still gener‐
ated.
BOOLEANS
SELinux policy is customizable based on least access required. sandbox
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run sandbox with the tightest access possi‐
ble.
If you want to deny user domains applications to map a memory region as
both executable and writable, this is dangerous and the executable
should be reported in bugzilla, you must turn on the deny_execmem bool‐
ean. Enabled by default.
setsebool -P deny_execmem 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
NSSWITCH DOMAIN
If you want to allow users to resolve user passwd entries directly from
ldap rather then using a sssd server for the sandbox_min_t, sand‐
box_net_t, sandbox_web_client_t, sandbox_xserver_t, sandbox_web_t,
sandbox_x_client_t, sandbox_x_t, sandbox_net_client_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
sandbox_min_t, sandbox_net_t, sandbox_web_client_t, sandbox_xserver_t,
sandbox_web_t, sandbox_x_client_t, sandbox_x_t, sandbox_net_client_t,
you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
MANAGED FILES
The SELinux process type sandbox_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.
sandbox_file_t
sandbox_tmpfs_type
all sandbox content in tmpfs file systems
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 sandbox policy is very flexible allowing users to setup their
sandbox processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the sandbox, 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 sandbox_devpts_t '/srv/sandbox/content(/.*)?'
restorecon -R -v /srv/mysandbox_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for sandbox:
sandbox_devpts_t
- Set files with the sandbox_devpts_t type, if you want to treat the
files as sandbox devpts data.
sandbox_exec_t
- Set files with the sandbox_exec_t type, if you want to transition an
executable to the sandbox_t domain.
sandbox_file_t
- Set files with the sandbox_file_t type, if you want to treat the
files as sandbox content.
sandbox_min_client_tmpfs_t
- Set files with the sandbox_min_client_tmpfs_t type, if you want to
store sandbox min client files on a tmpfs file system.
sandbox_net_client_tmpfs_t
- Set files with the sandbox_net_client_tmpfs_t type, if you want to
store sandbox net client files on a tmpfs file system.
sandbox_web_client_tmpfs_t
- Set files with the sandbox_web_client_tmpfs_t type, if you want to
store sandbox web client files on a tmpfs file system.
sandbox_x_client_tmpfs_t
- Set files with the sandbox_x_client_tmpfs_t type, if you want to
store sandbox x client files on a tmpfs file system.
sandbox_xserver_tmpfs_t
- Set files with the sandbox_xserver_tmpfs_t type, if you want to store
sandbox xserver 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 data‐
base. 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 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 auto-generated using sepolicy manpage .
SEE ALSOselinux(8), sandbox(8), semanage(8), restorecon(8), chcon(1), sepol‐
icy(8) , setsebool(8), sandbox_min_selinux(8), sandbox_min_selinux(8),
sandbox_min_client_selinux(8), sandbox_min_client_selinux(8), sand‐
box_net_selinux(8), sandbox_net_selinux(8), sand‐
box_net_client_selinux(8), sandbox_net_client_selinux(8), sand‐
box_web_selinux(8), sandbox_web_selinux(8), sand‐
box_web_client_selinux(8), sandbox_web_client_selinux(8), sand‐
box_x_selinux(8), sandbox_x_selinux(8), sandbox_x_client_selinux(8),
sandbox_x_client_selinux(8), sandbox_xserver_selinux(8), sand‐
box_xserver_selinux(8)sandbox 13-11-20 sandbox_selinux(8)
