install_selinux(8) SELinux Policy install install_selinux(8)
NAME
install_selinux - Security Enhanced Linux Policy for the install processes
DESCRIPTION
Security-Enhanced Linux secures the install processes via flexible mandatory access control.
The install processes execute with the install_t SELinux type. You can check if you have these processes running by executing the ps com-
mand with the -Z qualifier.
For example:
ps -eZ | grep install_t
ENTRYPOINTS
The install_t SELinux type can be entered via the unlabeled_t, proc_type, file_type, mtrr_device_t, filesystem_type, install_exec_t,
sysctl_type file types.
The default entrypoint paths for the install_t domain are the following:
all files on the system, /dev/cpu/mtrr, /usr/bin/ostree, /usr/sbin/anaconda, /usr/bin/rpm-ostree, /usr/libexec/anaconda/anaconda-yum
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 install policy is very flexible allowing users to setup their install
processes in as secure a method as possible.
The following process types are defined for install:
install_t
Note: semanage permissive -a install_t can be used to make the process type install_t permissive. SELinux does not deny access to permis-
sive process types, but the AVC (SELinux denials) messages are still generated.
BOOLEANS
SELinux policy is customizable based on least access required. install policy is extremely flexible and has several booleans that allow
you to manipulate the policy and run install 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 boolean. 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 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 executable. 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 selin-
uxuser_execstack 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 install_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 install policy is very flexible allowing users to setup their
install processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the install, if you wanted to store files with these types in a diffent paths, you need to exe-
cute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.
semanage fcontext -a -t install_exec_t '/srv/install/content(/.*)?'
restorecon -R -v /srv/myinstall_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for install:
install_exec_t
- Set files with the install_exec_t type, if you want to transition an executable to the install_t domain.
Paths:
/usr/bin/ostree, /usr/sbin/anaconda, /usr/bin/rpm-ostree, /usr/libexec/anaconda/anaconda-yum
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.
AUTHOR
This manual page was auto-generated using sepolicy manpage .
SEE ALSO
selinux(8), install(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8)
install 14-06-10 install_selinux(8)