[apple/libc.git] / sys / chmodx_np.c

/*
 * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#include <sys/types.h>
#include <sys/acl.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <uuid/uuid.h>

#if 1 /* for turdfile code only */
#include <string.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#endif

static int chmodx_syscall(void *obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec *fsacl);
static int fchmodx_syscall(void *obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec *fsacl);

static int chmodx1(void *obj,
		   int (* chmod_syscall)(void *obj, uid_t fsowner, gid_t fsgrp, int mode,
				       struct kauth_filesec *fsacl),
    		   filesec_t fsec);

/*
 * Chmod interfaces.
 */
int
chmodx_np(const char *path, filesec_t fsec)
{
	return(chmodx1((void *)&path, chmodx_syscall, fsec));
}

int
fchmodx_np(int fd, filesec_t fsec)
{
	return(chmodx1((void *)&fd, fchmodx_syscall, fsec));
}

/*
 * Chmod syscalls.
 */
extern int __chmod_extended(char *, uid_t, gid_t, int, struct kauth_filesec *);
extern int __fchmod_extended(int, uid_t, gid_t, int, struct kauth_filesec *);

static int
chmodx_syscall(void *obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec *fsacl)
{
	char *path = *(char **)obj;

	return(__chmod_extended(path, fsowner, fsgrp, mode, fsacl));
}

static int
fchmodx_syscall(void *obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec *fsacl)
{
	int fd = *(int *)obj;
	return(__fchmod_extended(fd, fsowner, fsgrp, mode, fsacl));
}

/*
 * Chmod internals.
 */
	
static int
chmodx1(void *obj,
    int (chmod_syscall)(void *obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec *fsacl),
    filesec_t fsec)
{
	uid_t fsowner = KAUTH_UID_NONE;
	gid_t fsgrp = KAUTH_GID_NONE;
	mode_t fsec_mode;
	int fsmode = -1;
	size_t size = 0;
	int fsacl_used = 0;
	int delete_acl = 0;
	struct kauth_filesec *fsacl = NULL;
	struct kauth_filesec static_filesec;

	if (fsec == NULL) {
		errno = EINVAL;
		return(-1);
	}
	
	/* regular properties */
	if ((filesec_get_property(fsec, FILESEC_OWNER, &fsowner) != 0) && (errno != ENOENT))
		return(-1);
	if ((filesec_get_property(fsec, FILESEC_GROUP, &fsgrp) != 0) && (errno != ENOENT))
		return(-1);
	if ((filesec_get_property(fsec, FILESEC_MODE, &fsec_mode)) != 0) {
		if (errno != ENOENT)
			return(-1);
	} else {
		/* cast up */
		fsmode = fsec_mode;
	}

	/*
	 * We can set any or all of the ACL and UUIDs, but the two are transported in one
	 * structure.  If we have an ACL, we'll use its allocated structure, otherwise we
	 * need our own.
	 */
	if (((filesec_get_property(fsec, FILESEC_ACL_RAW, &fsacl) != 0) ||
		(filesec_get_property(fsec, FILESEC_ACL_ALLOCSIZE, &size) != 0)) &&
	    (errno != ENOENT))
		return(-1);
	/* caller wants to delete ACL, must remember this */
	if (fsacl == _FILESEC_REMOVE_ACL) {
		delete_acl = 1;
		fsacl = 0;
	}
	
	/* no ACL, use local filesec */
	if (fsacl == NULL) {
		bzero(&static_filesec, sizeof(static_filesec));
		fsacl = &static_filesec;
		fsacl->fsec_magic = KAUTH_FILESEC_MAGIC;
		fsacl->fsec_entrycount = KAUTH_FILESEC_NOACL;
	} else {
		fsacl_used = 1;
	}

	/* grab the owner and group UUID if present */
	if (filesec_get_property(fsec, FILESEC_UUID, &fsacl->fsec_owner) != 0) {
		if (errno != ENOENT)
			return(-1);
		bzero(&fsacl->fsec_owner, sizeof(fsacl->fsec_owner));
	} else {
		fsacl_used = 1;
	}
	if (filesec_get_property(fsec, FILESEC_GRPUUID, &fsacl->fsec_group) != 0) {
		if (errno != ENOENT)
			return(-1);
		bzero(&fsacl->fsec_group, sizeof(fsacl->fsec_group));
	} else {
		fsacl_used = 1;
	}

	/* after all this, if we didn't find anything that needs it, don't pass it in */
	if (!fsacl_used) {
		/*
		 * If the caller was trying to remove the ACL, and there are no UUIDs,
		 * we can tell the kernel to completely nuke the whole datastructure.
		 */
		if (delete_acl) {
			fsacl = _FILESEC_REMOVE_ACL;
		} else {
			fsacl = NULL;
		}
	}

	return(chmod_syscall(obj, fsowner, fsgrp, fsmode, fsacl));
}
Commit	Line	Data
3d9156a7 A	1	/*
	2	* Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	#include <sys/types.h>
3d9156a7 A	24	#include <sys/acl.h>
	25	#include <errno.h>
	26	#include <fcntl.h>
	27	#include <unistd.h>
	28	#include <uuid/uuid.h>
	29
	30	#if 1 /* for turdfile code only */
	31	#include <string.h>
	32	#include <sys/stat.h>
	33	#include <stdio.h>
	34	#include <stdlib.h>
	35	#endif
	36
	37	static int chmodx_syscall(void obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec fsacl);
	38	static int fchmodx_syscall(void obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec fsacl);
	39
	40	static int chmodx1(void *obj,
	41	int (* chmod_syscall)(void *obj, uid_t fsowner, gid_t fsgrp, int mode,
	42	struct kauth_filesec *fsacl),
	43	filesec_t fsec);
	44
	45	/*
	46	* Chmod interfaces.
	47	*/
	48	int
	49	chmodx_np(const char *path, filesec_t fsec)
	50	{
	51	return(chmodx1((void *)&path, chmodx_syscall, fsec));
	52	}
	53
	54	int
	55	fchmodx_np(int fd, filesec_t fsec)
	56	{
	57	return(chmodx1((void *)&fd, fchmodx_syscall, fsec));
	58	}
	59
	60	/*
	61	* Chmod syscalls.
	62	*/
224c7076 A	63	extern int __chmod_extended(char , uid_t, gid_t, int, struct kauth_filesec );
	64	extern int __fchmod_extended(int, uid_t, gid_t, int, struct kauth_filesec *);
	65
3d9156a7 A	66	static int
	67	chmodx_syscall(void obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec fsacl)
	68	{
	69	char path = (char **)obj;
	70
224c7076	71	return(__chmod_extended(path, fsowner, fsgrp, mode, fsacl));
3d9156a7 A	72	}
	73
	74	static int
	75	fchmodx_syscall(void obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec fsacl)
	76	{
	77	int fd = (int )obj;
224c7076	78	return(__fchmod_extended(fd, fsowner, fsgrp, mode, fsacl));
3d9156a7 A	79	}
	80
	81	/*
	82	* Chmod internals.
	83	*/
	84
	85	static int
	86	chmodx1(void *obj,
	87	int (chmod_syscall)(void obj, uid_t fsowner, gid_t fsgrp, int mode, struct kauth_filesec fsacl),
	88	filesec_t fsec)
	89	{
	90	uid_t fsowner = KAUTH_UID_NONE;
	91	gid_t fsgrp = KAUTH_GID_NONE;
	92	mode_t fsec_mode;
	93	int fsmode = -1;
	94	size_t size = 0;
	95	int fsacl_used = 0;
	96	int delete_acl = 0;
	97	struct kauth_filesec *fsacl = NULL;
	98	struct kauth_filesec static_filesec;
	99
	100	if (fsec == NULL) {
	101	errno = EINVAL;
	102	return(-1);
	103	}
	104
	105	/* regular properties */
	106	if ((filesec_get_property(fsec, FILESEC_OWNER, &fsowner) != 0) && (errno != ENOENT))
	107	return(-1);
	108	if ((filesec_get_property(fsec, FILESEC_GROUP, &fsgrp) != 0) && (errno != ENOENT))
	109	return(-1);
	110	if ((filesec_get_property(fsec, FILESEC_MODE, &fsec_mode)) != 0) {
	111	if (errno != ENOENT)
	112	return(-1);
	113	} else {
	114	/* cast up */
	115	fsmode = fsec_mode;
	116	}
	117
	118	/*
	119	* We can set any or all of the ACL and UUIDs, but the two are transported in one
	120	* structure. If we have an ACL, we'll use its allocated structure, otherwise we
	121	* need our own.
	122	*/
	123	if (((filesec_get_property(fsec, FILESEC_ACL_RAW, &fsacl) != 0) \|\|
	124	(filesec_get_property(fsec, FILESEC_ACL_ALLOCSIZE, &size) != 0)) &&
	125	(errno != ENOENT))
	126	return(-1);
	127	/* caller wants to delete ACL, must remember this */
	128	if (fsacl == _FILESEC_REMOVE_ACL) {
	129	delete_acl = 1;
	130	fsacl = 0;
	131	}
	132
	133	/* no ACL, use local filesec */
	134	if (fsacl == NULL) {
	135	bzero(&static_filesec, sizeof(static_filesec));
	136	fsacl = &static_filesec;
	137	fsacl->fsec_magic = KAUTH_FILESEC_MAGIC;
	138	fsacl->fsec_entrycount = KAUTH_FILESEC_NOACL;
	139	} else {
	140	fsacl_used = 1;
	141	}
	142
143	/* grab the owner and group UUID if present */
144	if (filesec_get_property(fsec, FILESEC_UUID, &fsacl->fsec_owner) != 0) {
145	if (errno != ENOENT)
146	return(-1);
147	bzero(&fsacl->fsec_owner, sizeof(fsacl->fsec_owner));
148	} else {
149	fsacl_used = 1;
150	}
151	if (filesec_get_property(fsec, FILESEC_GRPUUID, &fsacl->fsec_group) != 0) {
152	if (errno != ENOENT)
153	return(-1);
154	bzero(&fsacl->fsec_group, sizeof(fsacl->fsec_group));
155	} else {
156	fsacl_used = 1;
157	}
158
159	/* after all this, if we didn't find anything that needs it, don't pass it in */
160	if (!fsacl_used) {
161	/*
162	* If the caller was trying to remove the ACL, and there are no UUIDs,
163	* we can tell the kernel to completely nuke the whole datastructure.
164	*/
165	if (delete_acl) {
166	fsacl = _FILESEC_REMOVE_ACL;
167	} else {
168	fsacl = NULL;
169	}
170	}
171
172	return(chmod_syscall(obj, fsowner, fsgrp, fsmode, fsacl));
173	}