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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,
char **context,
const char *device_name, int unused);
int selabel_lookup_raw(struct selabel_handle *hnd,
char **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 appropriate 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 con-
text 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_con-
text_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)).
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)
Security Enhanced Linux 29 Nov 2011 selabel_media(5)
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