/*
 * Copyright (c) 2003-2008 Novell, Inc. (All rights reserved)
 * Copyright 2009-2010 Canonical Ltd.
 *
 * The libapparmor library is licensed under the terms of the GNU
 * Lesser General Public License, version 2.1. Please see the file
 * COPYING.LGPL.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _SYS_APPARMOR_H
#define _SYS_APPARMOR_H	1

#include <stdbool.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Class of public mediation types in the AppArmor policy db
 */
#define AA_CLASS_FILE		2
#define AA_CLASS_DBUS		32


/* Permission flags for the AA_CLASS_FILE mediation class */
#define AA_MAY_EXEC			(1 << 0)
#define AA_MAY_WRITE			(1 << 1)
#define AA_MAY_READ			(1 << 2)
#define AA_MAY_APPEND			(1 << 3)
#define AA_MAY_CREATE			(1 << 4)
#define AA_MAY_DELETE			(1 << 5)
#define AA_MAY_OPEN			(1 << 6)
#define AA_MAY_RENAME			(1 << 7)
#define AA_MAY_SETATTR			(1 << 8)
#define AA_MAY_GETATTR			(1 << 9)
#define AA_MAY_SETCRED			(1 << 10)
#define AA_MAY_GETCRED			(1 << 11)
#define AA_MAY_CHMOD			(1 << 12)
#define AA_MAY_CHOWN			(1 << 13)
#define AA_MAY_LOCK			0x8000
#define AA_EXEC_MMAP			0x10000
#define AA_MAY_LINK			0x40000
#define AA_MAY_ONEXEC			0x20000000
#define AA_MAY_CHANGE_PROFILE		0x40000000

/* Permission flags for the AA_CLASS_DBUS mediation class */
#define AA_DBUS_SEND			(1 << 1)
#define AA_DBUS_RECEIVE		 	(1 << 2)
#define AA_DBUS_EAVESDROP		(1 << 5)
#define AA_DBUS_BIND			(1 << 6)
#define AA_VALID_DBUS_PERMS		(AA_DBUS_SEND | AA_DBUS_RECEIVE | \
					 AA_DBUS_BIND | AA_DBUS_EAVESDROP)


/* Prototypes for apparmor state queries */
extern int aa_is_enabled(void);
extern int aa_find_mountpoint(char **mnt);

/* Prototypes for self directed domain transitions
 * see <https://apparmor.net>
 * Please see the change_hat(2) manpage for information.
 */

#define change_hat(X, Y) aa_change_hat((X), (Y))
extern int (change_hat)(const char *subprofile, unsigned int magic_token);
extern int aa_change_hat(const char *subprofile, unsigned long magic_token);
extern int aa_change_profile(const char *profile);
extern int aa_change_onexec(const char *profile);

extern int aa_change_hatv(const char *subprofiles[], unsigned long token);
extern int (aa_change_hat_vargs)(unsigned long token, int count, ...);
extern int aa_stack_profile(const char *profile);
extern int aa_stack_onexec(const char *profile);

extern char *aa_splitcon(char *con, char **mode);
/* Protypes for introspecting task confinement
 * Please see the aa_getcon(2) manpage for information
 */
extern int aa_getprocattr_raw(pid_t tid, const char *attr, char *buf, int len,
			      char **mode);
extern int aa_getprocattr(pid_t tid, const char *attr, char **label,
			  char **mode);
extern int aa_gettaskcon(pid_t target, char **label, char **mode);
extern int aa_getcon(char **label, char **mode);
extern int aa_getpeercon_raw(int fd, char *buf, socklen_t *len, char **mode);
extern int aa_getpeercon(int fd, char **label, char **mode);

/* A NUL character is used to separate the query command prefix string from the
 * rest of the query string. The query command sizes intentionally include the
 * NUL-terminator in their values.
 */
#define AA_QUERY_CMD_LABEL		"label"
#define AA_QUERY_CMD_LABEL_SIZE		sizeof(AA_QUERY_CMD_LABEL)

extern int aa_query_label(uint32_t mask, char *query, size_t size, int *allow,
			  int *audit);
extern int aa_query_file_path_len(uint32_t mask, const char *label,
				  size_t label_len, const char *path,
				  size_t path_len, int *allowed, int *audited);
extern int aa_query_file_path(uint32_t mask, const char *label,
			      const char *path, int *allowed, int *audited);
extern int aa_query_link_path_len(const char *label, size_t label_len,
				  const char *target, size_t target_len,
				  const char *link, size_t link_len,
				  int *allowed, int *audited);
extern int aa_query_link_path(const char *label, const char *target,
			      const char *link, int *allowed, int *audited);

#define __macroarg_counter(Y...) __macroarg_count1 ( , ##Y)
#define __macroarg_count1(Y...) __macroarg_count2 (Y, 16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0)
#define __macroarg_count2(_,x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15,n,Y...) n

/**
 * change_hat_vargs - a wrapper macro for change_hat_vargs
 * @T: the magic token
 * @X...: the parameter list of hats being passed
 *
 * The change_hat_vargs macro makes it so the caller doesn't have to
 * specify the number of hats passed as parameters to the change_hat_vargs
 * fn.
 *
 * eg.
 * change_hat_vargs(10, hat1, hat2, hat3, hat4);
 * expandes to
 * (change_hat_vargs)(10, 4, hat1, hat2, hat3, hat4);
 *
 * to call change_hat_vargs direction do
 * (change_hat_vargs)(token, nhats, hat1, hat2...)
 */
#define aa_change_hat_vargs(T, X...) \
	(aa_change_hat_vargs)(T, __macroarg_counter(X), X)

typedef struct aa_features aa_features;
extern int aa_features_new(aa_features **features, int dirfd, const char *path);
extern int aa_features_new_from_file(aa_features **features, int file);
extern int aa_features_new_from_string(aa_features **features,
				       const char *string, size_t size);
extern int aa_features_new_from_kernel(aa_features **features);
extern aa_features *aa_features_ref(aa_features *features);
extern void aa_features_unref(aa_features *features);

extern int aa_features_write_to_fd(aa_features *features, int fd);
extern int aa_features_write_to_file(aa_features *features,
				     int dirfd, const char *path);
extern bool aa_features_is_equal(aa_features *features1,
				 aa_features *features2);
extern bool aa_features_supports(aa_features *features, const char *str);
extern char *aa_features_id(aa_features *features);
extern char *aa_features_value(aa_features *features, const char *str, size_t *len);

typedef struct aa_kernel_interface aa_kernel_interface;
extern int aa_kernel_interface_new(aa_kernel_interface **kernel_interface,
			    aa_features *kernel_features,
			    const char *apparmorfs);
extern aa_kernel_interface *aa_kernel_interface_ref(aa_kernel_interface *kernel_interface);
extern void aa_kernel_interface_unref(aa_kernel_interface *kernel_interface);

extern int aa_kernel_interface_load_policy(aa_kernel_interface *kernel_interface,
					   const char *buffer, size_t size);
extern int aa_kernel_interface_load_policy_from_file(aa_kernel_interface *kernel_interface,
						     int dirfd,
						     const char *path);
extern int aa_kernel_interface_load_policy_from_fd(aa_kernel_interface *kernel_interface,
						   int fd);
extern int aa_kernel_interface_replace_policy(aa_kernel_interface *kernel_interface,
					      const char *buffer, size_t size);
extern int aa_kernel_interface_replace_policy_from_file(aa_kernel_interface *kernel_interface,
							int dirfd,
							const char *path);
extern int aa_kernel_interface_replace_policy_from_fd(aa_kernel_interface *kernel_interface,
						      int fd);
extern int aa_kernel_interface_remove_policy(aa_kernel_interface *kernel_interface,
					     const char *fqname);
extern int aa_kernel_interface_write_policy(int fd, const char *buffer,
					    size_t size);

typedef struct aa_policy_cache aa_policy_cache;
extern int aa_policy_cache_new(aa_policy_cache **policy_cache,
			       aa_features *kernel_features,
			       int dirfd, const char *path,
			       uint16_t max_caches);
extern int aa_policy_cache_add_ro_dir(aa_policy_cache *policy_cache, int dirfd,
				      const char *path);
extern aa_policy_cache *aa_policy_cache_ref(aa_policy_cache *policy_cache);
extern void aa_policy_cache_unref(aa_policy_cache *policy_cache);

extern int aa_policy_cache_remove(int dirfd, const char *path);
extern int aa_policy_cache_replace_all(aa_policy_cache *policy_cache,
				       aa_kernel_interface *kernel_interface);
extern int aa_policy_cache_no_dirs(aa_policy_cache *policy_cache);
extern char *aa_policy_cache_dir_path(aa_policy_cache *policy_cache, int n);
extern int aa_policy_cache_dirfd(aa_policy_cache *policy_cache, int dir);
extern int aa_policy_cache_open(aa_policy_cache *policy_cache, const char *name,
				int flags);
extern char *aa_policy_cache_filename(aa_policy_cache *policy_cache, const char *name);
extern char *aa_policy_cache_dir_path_preview(aa_features *kernel_features,
					      int dirfd, const char *path);

#ifdef __cplusplus
}
#endif

#endif	/* sys/apparmor.h */