samba_unconfined_scrSELinuxiPolicy samba_uncsamba_unconfined_script_selinux(8)NAMEsamba_unconfined_script_selinux - Security Enhanced Linux Policy for
the samba_unconfined_script processes
DESCRIPTION
Security-Enhanced Linux secures the samba_unconfined_script processes
via flexible mandatory access control.
The samba_unconfined_script processes execute with the samba_uncon‐
fined_script_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 samba_unconfined_script_t
ENTRYPOINTS
The samba_unconfined_script_t SELinux type can be entered via the
shell_exec_t, samba_unconfined_script_exec_t, filesystem_type, unla‐
beled_t, proc_type, file_type, sysctl_type, mtrr_device_t file types.
The default entrypoint paths for the samba_unconfined_script_t domain
are the following:
/bin/d?ash, /bin/zsh.*, /bin/ksh.*, /usr/bin/d?ash, /usr/bin/zsh.*,
/usr/bin/ksh.*, /bin/esh, /bin/mksh, /bin/sash, /bin/tcsh, /bin/yash,
/bin/bash, /bin/fish, /bin/bash2, /usr/bin/esh, /usr/bin/sash,
/usr/bin/tcsh, /usr/bin/yash, /usr/bin/fish, /usr/bin/mksh,
/usr/bin/bash, /sbin/nologin, /usr/sbin/sesh, /usr/bin/bash2,
/usr/sbin/smrsh, /usr/bin/scponly, /usr/sbin/nologin,
/usr/libexec/sesh, /usr/sbin/scponlyc, /usr/bin/git-shell,
/usr/libexec/git-core/git-shell, /var/lib/samba/scripts(/.*)?, all
files on the system, /dev/cpu/mtrr
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
samba_unconfined_script policy is very flexible allowing users to setup
their samba_unconfined_script processes in as secure a method as possi‐
ble.
The following process types are defined for samba_unconfined_script:
samba_unconfined_script_t
Note: semanage permissive -a samba_unconfined_script_t can be used to
make the process type samba_unconfined_script_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.
samba_unconfined_script policy is extremely flexible and has several
booleans that allow you to manipulate the policy and run samba_uncon‐
fined_script with the tightest access possible.
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
If you want to control the ability to mmap a low area of the address
space, as configured by /proc/sys/kernel/mmap_min_addr, you must turn
on the mmap_low_allowed boolean. Disabled by default.
setsebool -P mmap_low_allowed 1
If you want to allow samba to run unconfined scripts, you must turn on
the samba_run_unconfined boolean. Disabled by default.
setsebool -P samba_run_unconfined 1
If you want to disable kernel module loading, you must turn on the
secure_mode_insmod boolean. Enabled by default.
setsebool -P secure_mode_insmod 1
If you want to boolean to determine whether the system permits loading
policy, setting enforcing mode, and changing boolean values. Set this
to true and you have to reboot to set it back, you must turn on the
secure_mode_policyload boolean. Enabled by default.
setsebool -P secure_mode_policyload 1
If you want to allow unconfined executables to make their heap memory
executable. Doing this is a really bad idea. Probably indicates a
badly coded executable, but could indicate an attack. This executable
should be reported in bugzilla, you must turn on the selin‐
uxuser_execheap boolean. Disabled by default.
setsebool -P selinuxuser_execheap 1
If you want to allow all unconfined executables to use libraries
requiring text relocation that are not labeled textrel_shlib_t, you
must turn on the selinuxuser_execmod boolean. Enabled by default.
setsebool -P selinuxuser_execmod 1
If you want to allow unconfined executables to make their stack exe‐
cutable. This should never, ever be necessary. Probably indicates a
badly coded executable, but could indicate an attack. This executable
should be reported in bugzilla, you must turn on the selinuxuser_exec‐
stack boolean. Enabled by default.
setsebool -P selinuxuser_execstack 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
If you want to allow ZoneMinder to run su/sudo, you must turn on the
zoneminder_run_sudo boolean. Disabled by default.
setsebool -P zoneminder_run_sudo 1
MANAGED FILES
The SELinux process type samba_unconfined_script_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.
file_type
all files on the system
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 samba_unconfined_script policy is very flexible allowing users
to setup their samba_unconfined_script processes in as secure a method
as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the samba_unconfined_script,
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 samba_unconfined_script_exec_t
'/srv/samba_unconfined_script/content(/.*)?'
restorecon -R -v /srv/mysamba_unconfined_script_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for samba_unconfined_script:
samba_unconfined_script_exec_t
- Set files with the samba_unconfined_script_exec_t type, if you want
to transition an executable to the samba_unconfined_script_t domain.
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), samba_unconfined_script(8), semanage(8), restorecon(8),
chcon(1), sepolicy(8) , setsebool(8)samba_unconfined_script 13-11-20 samba_unconfined_script_selinux(8)
