blob: 8add71a5c179c871454451233ed9a0fbb07f59c3 [file] [log] [blame]
/*
* This file describes the internal interface used by the labeler
* for calling the user-supplied memory allocation, validation,
* and locking routine.
*
* Author : Eamon Walsh <ewalsh@epoch.ncsc.mil>
*/
#ifndef _SELABEL_INTERNAL_H_
#define _SELABEL_INTERNAL_H_
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <selinux/selinux.h>
#include <selinux/label.h>
#include "dso.h"
#include "sha1.h"
#if defined(ANDROID) || defined(__APPLE__)
// Android and Mac do not have fgets_unlocked()
#define fgets_unlocked(buf, size, fp) fgets(buf, size, fp)
#endif
/*
* Installed backends
*/
int selabel_file_init(struct selabel_handle *rec,
const struct selinux_opt *opts,
unsigned nopts) hidden;
int selabel_media_init(struct selabel_handle *rec,
const struct selinux_opt *opts,
unsigned nopts) hidden;
int selabel_x_init(struct selabel_handle *rec,
const struct selinux_opt *opts,
unsigned nopts) hidden;
int selabel_db_init(struct selabel_handle *rec,
const struct selinux_opt *opts,
unsigned nopts) hidden;
int selabel_property_init(struct selabel_handle *rec,
const struct selinux_opt *opts,
unsigned nopts) hidden;
int selabel_service_init(struct selabel_handle *rec,
const struct selinux_opt *opts,
unsigned nopts) hidden;
/*
* Labeling internal structures
*/
/*
* Calculate an SHA1 hash of all the files used to build the specs.
* The hash value is held in rec->digest if SELABEL_OPT_DIGEST set. To
* calculate the hash the hashbuf will hold a concatenation of all the files
* used. This is released once the value has been calculated.
*/
#define DIGEST_SPECFILE_SIZE SHA1_HASH_SIZE
#define DIGEST_FILES_MAX 8
struct selabel_digest {
unsigned char *digest; /* SHA1 digest of specfiles */
unsigned char *hashbuf; /* buffer to hold specfiles */
size_t hashbuf_size; /* buffer size */
size_t specfile_cnt; /* how many specfiles processed */
char **specfile_list; /* and their names */
};
extern int digest_add_specfile(struct selabel_digest *digest, FILE *fp,
char *from_addr,
size_t buf_len,
const char *path);
extern void digest_gen_hash(struct selabel_digest *digest);
struct selabel_lookup_rec {
char * ctx_raw;
char * ctx_trans;
int validated;
unsigned lineno;
};
struct selabel_handle {
/* arguments that were passed to selabel_open */
unsigned int backend;
int validating;
/* labeling operations */
struct selabel_lookup_rec *(*func_lookup) (struct selabel_handle *h,
const char *key, int type);
void (*func_close) (struct selabel_handle *h);
void (*func_stats) (struct selabel_handle *h);
bool (*func_partial_match) (struct selabel_handle *h, const char *key);
bool (*func_hash_all_partial_matches) (struct selabel_handle *h,
const char *key, uint8_t *digest);
struct selabel_lookup_rec *(*func_lookup_best_match)
(struct selabel_handle *h,
const char *key,
const char **aliases,
int type);
enum selabel_cmp_result (*func_cmp)(struct selabel_handle *h1,
struct selabel_handle *h2);
/* supports backend-specific state information */
void *data;
/*
* The main spec file(s) used. Note for file contexts the local and/or
* homedirs could also have been used to resolve a context.
*/
size_t spec_files_len;
char **spec_files;
/* ptr to SHA1 hash information if SELABEL_OPT_DIGEST set */
struct selabel_digest *digest;
};
/*
* Validation function
*/
extern int
selabel_validate(struct selabel_handle *rec,
struct selabel_lookup_rec *contexts) hidden;
/*
* Compatibility support
*/
extern int myprintf_compat;
extern void __attribute__ ((format(printf, 1, 2)))
(*myprintf) (const char *fmt, ...) hidden;
#define COMPAT_LOG(type, fmt...) if (myprintf_compat) \
myprintf(fmt); \
else \
selinux_log(type, fmt);
extern int
compat_validate(struct selabel_handle *rec,
struct selabel_lookup_rec *contexts,
const char *path, unsigned lineno) hidden;
/*
* The read_spec_entries function may be used to
* replace sscanf to read entries from spec files.
*/
extern int read_spec_entries(char *line_buf, const char **errbuf, int num_args, ...);
#endif /* _SELABEL_INTERNAL_H_ */