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      1 /*
      2  * This file describes the internal interface used by the labeler
      3  * for calling the user-supplied memory allocation, validation,
      4  * and locking routine.
      5  *
      6  * Author : Eamon Walsh <ewalsh (at) epoch.ncsc.mil>
      7  */
      8 #ifndef _SELABEL_INTERNAL_H_
      9 #define _SELABEL_INTERNAL_H_
     10 
     11 #include <stdlib.h>
     12 #include <stdarg.h>
     13 #include <selinux/selinux.h>
     14 #include <selinux/label.h>
     15 #include "dso.h"
     16 
     17 /*
     18  * Installed backends
     19  */
     20 int selabel_file_init(struct selabel_handle *rec, struct selinux_opt *opts,
     21 		      unsigned nopts) hidden;
     22 int selabel_media_init(struct selabel_handle *rec, struct selinux_opt *opts,
     23 		      unsigned nopts) hidden;
     24 int selabel_x_init(struct selabel_handle *rec, struct selinux_opt *opts,
     25 		   unsigned nopts) hidden;
     26 int selabel_db_init(struct selabel_handle *rec,
     27 		    struct selinux_opt *opts, unsigned nopts) hidden;
     28 int selabel_property_init(struct selabel_handle *rec,
     29 			  struct selinux_opt *opts, unsigned nopts) hidden;
     30 
     31 /*
     32  * Labeling internal structures
     33  */
     34 struct selabel_sub {
     35 	char *src;
     36 	int slen;
     37 	char *dst;
     38 	struct selabel_sub *next;
     39 };
     40 
     41 extern struct selabel_sub *selabel_subs_init(const char *path,
     42 					     struct selabel_sub *list);
     43 
     44 struct selabel_lookup_rec {
     45 	char * ctx_raw;
     46 	char * ctx_trans;
     47 	int validated;
     48 };
     49 
     50 struct selabel_handle {
     51 	/* arguments that were passed to selabel_open */
     52 	unsigned int backend;
     53 	int validating;
     54 
     55 	/* labeling operations */
     56 	struct selabel_lookup_rec *(*func_lookup) (struct selabel_handle *h,
     57 						   const char *key, int type);
     58 	void (*func_close) (struct selabel_handle *h);
     59 	void (*func_stats) (struct selabel_handle *h);
     60 
     61 	/* supports backend-specific state information */
     62 	void *data;
     63 
     64 	/*
     65 	 * The main spec file used. Note for file contexts the local and/or
     66 	 * homedirs could also have been used to resolve a context.
     67 	 */
     68 	char *spec_file;
     69 
     70 	/* substitution support */
     71 	struct selabel_sub *dist_subs;
     72 	struct selabel_sub *subs;
     73 };
     74 
     75 /*
     76  * Validation function
     77  */
     78 extern int
     79 selabel_validate(struct selabel_handle *rec,
     80 		 struct selabel_lookup_rec *contexts) hidden;
     81 
     82 /*
     83  * Compatibility support
     84  */
     85 extern int myprintf_compat;
     86 extern void __attribute__ ((format(printf, 1, 2)))
     87 (*myprintf) (const char *fmt,...);
     88 
     89 #define COMPAT_LOG(type, fmt...) if (myprintf_compat)	  \
     90 		myprintf(fmt);				  \
     91 	else						  \
     92 		selinux_log(type, fmt);
     93 
     94 extern int
     95 compat_validate(struct selabel_handle *rec,
     96 		struct selabel_lookup_rec *contexts,
     97 		const char *path, unsigned lineno) hidden;
     98 
     99 #endif				/* _SELABEL_INTERNAL_H_ */
    100