iwhd_selinux (8) - Linux Manuals
iwhd_selinux: Security Enhanced Linux Policy for the iwhd processes
NAME
iwhd_selinux - Security Enhanced Linux Policy for the iwhd processesDESCRIPTION
Security-Enhanced Linux secures the iwhd processes via flexible mandatory access control.
The iwhd processes execute with the iwhd_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 iwhd_t
ENTRYPOINTS
The iwhd_t SELinux type can be entered via the iwhd_exec_t file type.
The default entrypoint paths for the iwhd_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 iwhd policy is very flexible allowing users to setup their iwhd processes in as secure a method as possible.
The following process types are defined for iwhd:
iwhd_t
Note: semanage permissive -a iwhd_t can be used to make the process type iwhd_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. iwhd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run iwhd with the tightest access possible.
If you want to allow all daemons to write corefiles to /, you must turn on the daemons_dump_core boolean. Disabled by default.
setsebool -P daemons_dump_core 1
If you want to enable cluster mode for daemons, you must turn on the daemons_enable_cluster_mode boolean. Enabled by default.
setsebool -P daemons_enable_cluster_mode 1
If you want to allow all daemons to use tcp wrappers, you must turn on the daemons_use_tcp_wrapper boolean. Disabled by default.
setsebool -P daemons_use_tcp_wrapper 1
If you want to allow all daemons the ability to read/write terminals, you must turn on the daemons_use_tty boolean. Disabled by default.
setsebool -P daemons_use_tty 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 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
MANAGED FILES
The SELinux process type iwhd_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
cluster_conf_t
cluster_var_lib_t
cluster_var_run_t
ecryptfs_t
fusefs_t
iwhd_log_t
iwhd_var_lib_t
iwhd_var_run_t
nfs_t
root_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 iwhd policy is very flexible allowing users to setup their iwhd processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the iwhd, 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 iwhd_var_run_t '/srv/myiwhd_content(/.*)?'
restorecon -R -v /srv/myiwhd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for iwhd:
iwhd_exec_t
- Set files with the iwhd_exec_t type, if you want to transition an executable to the iwhd_t domain.
iwhd_initrc_exec_t
- Set files with the iwhd_initrc_exec_t type, if you want to transition an executable to the iwhd_initrc_t domain.
iwhd_log_t
- Set files with the iwhd_log_t type, if you want to treat the data as iwhd log data, usually stored under the /var/log directory.
iwhd_var_lib_t
- Set files with the iwhd_var_lib_t type, if you want to store the iwhd files under the /var/lib directory.
iwhd_var_run_t
- Set files with the iwhd_var_run_t type, if you want to store the iwhd files under the /run or /var/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.
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.