ldconfig_selinux man page

ldconfig_selinux — Security Enhanced Linux Policy for the ldconfig processes

Description

Security-Enhanced Linux secures the ldconfig processes via flexible mandatory access control.

The ldconfig processes execute with the ldconfig_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 ldconfig_t

Entrypoints

The ldconfig_t SELinux type can be entered via the ldconfig_exec_t file type.

The default entrypoint paths for the ldconfig_t domain are the following:

/sbin/ldconfig, /usr/sbin/ldconfig

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 psbP

Policy governs the access confined processes have to files. SELinux ldconfig policy is very flexible allowing users to setup their ldconfig processes in as secure a method as possible.

The following process types are defined for ldconfig:

ldconfig_t

Note: semanage permissive -a ldconfig_t can be used to make the process type ldconfig_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. ldconfig policy is extremely flexible and has several booleans that allow you to manipulate the policy and run ldconfig with the tightest access possible.

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 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 ldconfig_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.

kdumpctl_tmp_t

ld_so_cache_t

/etc/ld.so.cache
/etc/ld.so.cache~
/etc/ld.so.preload
/etc/ld.so.preload~

ldconfig_cache_t

/var/cache/ldconfig(/.*)?

ldconfig_tmp_t

rpm_script_tmp_t

user_home_t

/home/[^/]+/.+

user_tmp_t

/dev/shm/mono.*
/var/run/user(/.*)?
/tmp/.X11-unix(/.*)?
/tmp/.ICE-unix(/.*)?
/dev/shm/pulse-shm.*
/tmp/.X0-lock
/tmp/hsperfdata_root
/var/tmp/hsperfdata_root
/home/[^/]+/tmp
/home/[^/]+/.tmp
/tmp/gconfd-[^/]+

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 lsbP

Policy governs the access confined processes have to these files. SELinux ldconfig policy is very flexible allowing users to setup their ldconfig processes in as secure a method as possible.

STANDARD FILE CONTEXT

SELinux defines the file context types for the ldconfig, 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 ldconfig_tmp_t '/srv/myldconfig_content(/.*)?'
restorecon -R -v /srv/myldconfig_content

Note: SELinux often uses regular expressions to specify labels that match multiple files.

The following file types are defined for ldconfig:

ldconfig_cache_t

- Set files with the ldconfig_cache_t type, if you want to store the files under the /var/cache directory.

ldconfig_exec_t

- Set files with the ldconfig_exec_t type, if you want to transition an executable to the ldconfig_t domain.

Paths:
/sbin/ldconfig, /usr/sbin/ldconfig

ldconfig_tmp_t

- Set files with the ldconfig_tmp_t type, if you want to store ldconfig temporary files in the /tmp directories.

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), ldconfig(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8)

Info

16-12-05 ldconfig SELinux Policy ldconfig