selabel_media(5)					     SELinux API documentation						  selabel_media(5)

NAME

       selabel_media - userspace SELinux labeling interface and configuration file format for the media contexts backend

SYNOPSIS

       #include <selinux/label.h>

       int selabel_lookup(struct selabel_handle *hnd,
			  security_context_t *context,
			  const char *device_name, int unused);

       int selabel_lookup_raw(struct selabel_handle *hnd,
			  security_context_t *context,
			  const char *device_name, int unused);

DESCRIPTION

       The  media  contexts backend maps from media device names such as "cdrom" or "floppy" into security contexts. It is used to find the appro-
       priate context for establishing context mounts on these devices. The returned context must be freed using freecon(3).
       selabel_lookup(3) describes the function with its return and error codes.

       The integer lookup argument is currently unused and should be set to zero.

       Any messages generated by selabel_lookup(3) are sent to stderr by default, although this can be changed by selinux_set_callback(3).

       selabel_lookup_raw(3) behaves identically to selabel_lookup(3) but does not perform context translation.

       The FILES section details the configuration files used to determine the media context.

OPTIONS

       In addition to the global options described in selabel_open(3), this backend recognizes the following options:

       SELABEL_OPT_PATH
	      A non-null value for this option specifies a path to a file that will be opened in lieu of the standard media contexts file.

FILES

       The media context file used to retrieve a default context depends on the SELABEL_OPT_PATH parameter passed  to  selabel_open(3).  If  NULL,
       then  the  SELABEL_OPT_PATH value will default to the active policy media contexts location (as returned by selinux_media_context_path(3)),
       otherwise the actual SELABEL_OPT_PATH value specified is used.

       The default media contexts file is:
	      /etc/selinux/{SELINUXTYPE}/contexts/files/media

       Where {SELINUXTYPE} is the entry from the selinux configuration file config (see selinux_config(5)).

       Should there not be a valid entry in the media file, then the default removable_context file will be read (see removable_context(5)).

FILE FORMAT

       Each line within the media file is as follows:
	      device_name context

       Where:
	      device_name
		     The media identifier (e.g. cdrom, floppy, disk and usb).
	      context
		     The context to be used for labeling the device.

       Example:
	      # contexts/files/media
	      cdrom system_u:object_r:removable_device_t
	      floppy system_u:object_r:removable_device_t
	      disk system_u:object_r:fixed_disk_device_t

NOTES

       If contexts are to be validated, then the global option SELABEL_OPT_VALIDATE must be set before calling selabel_open(3).  If  this  is  not
       set, then it is possible for an invalid context to be returned.

SEE ALSO

       selinux(8), selabel_open(3), selabel_lookup(3), selabel_stats(3), selabel_close(3), selinux_set_callback(3), selinux_media_context_path(3),
       freecon(3), selinux_config(5), removable_context(5)

Security Enhanced Linux 					    29 Nov 2011 						  selabel_media(5)