Preview: label.h
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//usr/include/selinux/label.h
/*
* Labeling interface for userspace object managers and others.
*
* Author : Eamon Walsh <ewalsh@tycho.nsa.gov>
*/
#ifndef _SELABEL_H_
#define _SELABEL_H_
#include <stdbool.h>
#include <stdint.h>
#include <sys/types.h>
#include <selinux/selinux.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Opaque type used for all label handles.
*/
struct selabel_handle;
/*
* Available backends.
*/
/* file contexts */
#define SELABEL_CTX_FILE 0
/* media contexts */
#define SELABEL_CTX_MEDIA 1
/* x contexts */
#define SELABEL_CTX_X 2
/* db objects */
#define SELABEL_CTX_DB 3
/* Android property service contexts */
#define SELABEL_CTX_ANDROID_PROP 4
/* Android service contexts */
#define SELABEL_CTX_ANDROID_SERVICE 5
/*
* Available options
*/
/* no-op option, useful for unused slots in an array of options */
#define SELABEL_OPT_UNUSED 0
/* validate contexts before returning them (boolean value) */
#define SELABEL_OPT_VALIDATE 1
/* don't use local customizations to backend data (boolean value) */
#define SELABEL_OPT_BASEONLY 2
/* specify an alternate path to use when loading backend data */
#define SELABEL_OPT_PATH 3
/* select a subset of the search space as an optimization (file backend) */
#define SELABEL_OPT_SUBSET 4
/* require a hash calculation on spec files */
#define SELABEL_OPT_DIGEST 5
/* total number of options */
#define SELABEL_NOPT 6
/*
* Label operations
*/
/**
* selabel_open - Create a labeling handle.
* @backend: one of the constants specifying a supported labeling backend.
* @opts: array of selabel_opt structures specifying label options or NULL.
* @nopts: number of elements in opts array or zero for no options.
*
* Open a labeling backend for use. The available backend identifiers are
* listed above. Options may be provided via the opts parameter; available
* options are listed above. Not all options may be supported by every
* backend. Return value is the created handle on success or NULL with
* @errno set on failure.
*/
extern struct selabel_handle *selabel_open(unsigned int backend,
const struct selinux_opt *opts,
unsigned nopts);
/**
* selabel_close - Close a labeling handle.
* @handle: specifies handle to close
*
* Destroy the specified handle, closing files, freeing allocated memory,
* etc. The handle may not be further used after it has been closed.
*/
extern void selabel_close(struct selabel_handle *handle);
/**
* selabel_lookup - Perform labeling lookup operation.
* @handle: specifies backend instance to query
* @con: returns the appropriate context with which to label the object
* @key: string input to lookup operation
* @type: numeric input to the lookup operation
*
* Perform a labeling lookup operation. Return %0 on success, -%1 with
* @errno set on failure. The key and type arguments are the inputs to the
* lookup operation; appropriate values are dictated by the backend in use.
* The result is returned in the memory pointed to by @con and must be freed
* by the user with freecon().
*/
extern int selabel_lookup(struct selabel_handle *handle, char **con,
const char *key, int type);
extern int selabel_lookup_raw(struct selabel_handle *handle, char **con,
const char *key, int type);
extern bool selabel_partial_match(struct selabel_handle *handle, const char *key);
extern bool selabel_get_digests_all_partial_matches(struct selabel_handle *rec,
const char *key,
uint8_t **calculated_digest,
uint8_t **xattr_digest,
size_t *digest_len);
extern bool selabel_hash_all_partial_matches(struct selabel_handle *rec,
const char *key, uint8_t* digest);
extern int selabel_lookup_best_match(struct selabel_handle *rec, char **con,
const char *key, const char **aliases, int type);
extern int selabel_lookup_best_match_raw(struct selabel_handle *rec, char **con,
const char *key, const char **aliases, int type);
/**
* selabel_digest - Retrieve the SHA256 digest and the list of specfiles used to
* generate the digest. The SELABEL_OPT_DIGEST option must
* be set in selabel_open() to initiate the digest generation.
* @handle: specifies backend instance to query
* @digest: returns a pointer to the SHA256 digest.
* @digest_len: returns length of digest in bytes.
* @specfiles: a list of specfiles used in the SHA256 digest generation.
* The list is NULL terminated and will hold @num_specfiles entries.
* @num_specfiles: number of specfiles in the list.
*
* Return %0 on success, -%1 with @errno set on failure.
*/
extern int selabel_digest(struct selabel_handle *rec,
unsigned char **digest, size_t *digest_len,
char ***specfiles, size_t *num_specfiles);
enum selabel_cmp_result {
SELABEL_SUBSET,
SELABEL_EQUAL,
SELABEL_SUPERSET,
SELABEL_INCOMPARABLE
};
/**
* selabel_cmp - Compare two label configurations.
* @h1: handle for the first label configuration
* @h2: handle for the first label configuration
*
* Compare two label configurations.
* Return %SELABEL_SUBSET if @h1 is a subset of @h2, %SELABEL_EQUAL
* if @h1 is identical to @h2, %SELABEL_SUPERSET if @h1 is a superset
* of @h2, and %SELABEL_INCOMPARABLE if @h1 and @h2 are incomparable.
*/
extern enum selabel_cmp_result selabel_cmp(const struct selabel_handle *h1,
const struct selabel_handle *h2);
/**
* selabel_stats - log labeling operation statistics.
* @handle: specifies backend instance to query
*
* Log a message with information about the number of queries performed,
* number of unused matching entries, or other operational statistics.
* Message is backend-specific, some backends may not output a message.
*/
extern void selabel_stats(struct selabel_handle *handle);
/*
* Type codes used by specific backends
*/
/* X backend */
#define SELABEL_X_PROP 1
#define SELABEL_X_EXT 2
#define SELABEL_X_CLIENT 3
#define SELABEL_X_EVENT 4
#define SELABEL_X_SELN 5
#define SELABEL_X_POLYPROP 6
#define SELABEL_X_POLYSELN 7
/* DB backend */
#define SELABEL_DB_DATABASE 1
#define SELABEL_DB_SCHEMA 2
#define SELABEL_DB_TABLE 3
#define SELABEL_DB_COLUMN 4
#define SELABEL_DB_SEQUENCE 5
#define SELABEL_DB_VIEW 6
#define SELABEL_DB_PROCEDURE 7
#define SELABEL_DB_BLOB 8
#define SELABEL_DB_TUPLE 9
#define SELABEL_DB_LANGUAGE 10
#define SELABEL_DB_EXCEPTION 11
#define SELABEL_DB_DATATYPE 12
#ifdef __cplusplus
}
#endif
#endif /* _SELABEL_H_ */
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