selabel_media(5)          SELinux API documentation         selabel_media(5)

NAME         top

       selabel_media  -  userspace SELinux labeling interface and configura‐
       tion file format for the media contexts backend

SYNOPSIS         top

       #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         top

       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

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

       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         top

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

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

FILES         top

       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:

       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         top

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

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

              # 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         top

       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

SEE ALSO         top

       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),

COLOPHON         top

       This page is part of the selinux (Security-Enhanced Linux user-space
       libraries and tools) project.  Information about the project can be
       found at ⟨⟩.  If you
       have a bug report for this manual page, see 
       ⟨⟩.  This
       page was obtained from the project's upstream Git repository 
       ⟨⟩ on 2017-03-13.  If you
       discover any rendering problems in this HTML version of the page, or
       you believe there is a better or more up-to-date source for the page,
       or you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

Security Enhanced Linux          29 Nov 2011                selabel_media(5)