selabel_open(3)

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)