NAME

       selabel_open, selabel_close - userspace SELinux labeling interface

SYNOPSIS

       #include <selinux/selinux.h>
       #include <selinux/label.h>

       struct selabel_handle *selabel_open(unsigned int backend,
                                           const struct selinux_opt *options,
                                           unsigned nopt);

       void selabel_close(struct selabel_handle *hnd);

DESCRIPTION

       selabel_open()  is  used to initialize a labeling handle to be used for lookup operations.
       The backend argument specifies which backend is to be opened; the list of current backends
       appears in BACKENDS below.

       The  options argument should be NULL or a pointer to an array of selinux_opt structures of
       length nopt:

              struct selinux_opt {
                  int         type;
                  const char  *value;
              };

       The available option types are described in  GLOBAL  OPTIONS  below  as  well  as  in  the
       documentation  for  each  individual  backend.   The return value on success is a non-NULL
       value for use in subsequent label operations.

       selabel_close() terminates use of a handle, freeing any internal resources associated with
       it.  After this call has been made, the handle must not be used again.

GLOBAL OPTIONS

       Global options which may be passed to selabel_open() include the following:

       SELABEL_OPT_UNUSED
              The  option  with  a type code of zero is a no-op.  Thus an array of options may be
              initizalized to zero and any untouched elements will not cause an error.

       SELABEL_OPT_VALIDATE
              A  non-null  value  for  this  option  enables  context  validation.   By  default,
              security_check_context(3) is used; a custom validation function can be provided via
              selinux_set_callback(3).  Note that an invalid context may not  be  treated  as  an
              error unless it is actually encountered during a lookup operation.

       SELABEL_OPT_DIGEST
              A  non-null  value  for this option enables the generation of an SHA1 digest of the
              spec files loaded as described in selabel_digest(3)

BACKENDS

       SELABEL_CTX_FILE
              File contexts backend, described in selabel_file(5).

       SELABEL_CTX_MEDIA
              Media contexts backend, described in selabel_media(5).

       SELABEL_CTX_X
              X Windows contexts backend, described in selabel_x(5).

       SELABEL_CTX_DB
              Database objects contexts backend, described in selabel_db(5).

RETURN VALUE

       A non-NULL handle value is returned on success.  On error, NULL is returned and  errno  is
       set appropriately.

AUTHOR

       Eamon Walsh <ewalsh@tycho.nsa.gov>

SEE ALSO

       selabel_lookup(3), selabel_stats(3), selinux_set_callback(3), selinux(8)

                                           18 Jun 2007                            selabel_open(3)