xref: /onnv-gate/usr/src/lib/libsec/common/aclutils.c (revision 1231)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <grp.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/acl.h>
#include <errno.h>
#include <sys/stat.h>
#include <locale.h>
#include <aclutils.h>
#include <acl_common.h>

#define	ACL_PATH	0
#define	ACL_FD		1

#define	ACE_POSIX_SUPPORTED_BITS (ACE_READ_DATA | \
    ACE_WRITE_DATA | ACE_APPEND_DATA | ACE_EXECUTE | \
    ACE_READ_ATTRIBUTES | ACE_READ_ACL | ACE_WRITE_ACL)


#define	ACL_SYNCHRONIZE_SET_ALLOW		0x0000002
#define	ACL_SYNCHRONIZE_SET_DENY		0x0000001

#define	ACL_WRITE_OWNER_SET_ALLOW		0x0000020
#define	ACL_WRITE_OWNER_SET_DENY		0x0000010

#define	ACL_WRITE_ATTRS_OWNER_SET_ALLOW		0x0002000
#define	ACL_WRITE_ATTRS_OWNER_SET_DENY		0x0001000

#define	ACL_WRITE_ATTRS_WRITER_SET_DENY		0x0010000

#define	ACL_DELETE_SET_ALLOW			0x0000200
#define	ACL_DELETE_SET_DENY			0x0000100

#define	ACL_READ_NAMED_READER_SET_ALLOW		0x2000000

#define	ACL_WRITE_NAMED_WRITER_SET_ALLOW	0x0200000
#define	ACL_WRITE_NAMED_WRITER_SET_DENY		0x0100000

#define	ACL_WRITE_ATTRS_OWNER_SET_ALLOW		0x0002000
#define	ACL_WRITE_ATTRS_WRITER_SET_ALLOW	0x0020000

#define	ACL_WRITE_OWNER_ERR_DENY		0x0000040
#define	ACL_READ_NAMED_READER_SET_DENY		0x1000000

typedef union {
	const char *file;
	int  fd;
} acl_inp;

acl_t *
acl_alloc(enum acl_type type)
{
	acl_t *aclp;

	aclp = malloc(sizeof (acl_t));

	if (aclp == NULL)
		return (NULL);

	aclp->acl_aclp = NULL;
	aclp->acl_cnt = 0;

	switch (type) {
	case ACE_T:
		aclp->acl_type = ACE_T;
		aclp->acl_entry_size = sizeof (ace_t);
		break;
	case ACLENT_T:
		aclp->acl_type = ACLENT_T;
		aclp->acl_entry_size = sizeof (aclent_t);
		break;
	default:
		acl_free(aclp);
		aclp = NULL;
	}
	return (aclp);
}

/*
 * Free acl_t structure
 */
void
acl_free(acl_t *aclp)
{
	if (aclp == NULL)
		return;

	if (aclp->acl_aclp)
		free(aclp->acl_aclp);
	free(aclp);
}

/*
 * Determine whether a file has a trivial ACL
 * returns: 	0 = trivial
 *		1 = nontrivial
 *		<0 some other system failure, such as ENOENT or EPERM
 */
int
acl_trivial(const char *filename)
{
	int acl_flavor;
	int aclcnt;
	int cntcmd;
	int val = 0;
	ace_t *acep;

	acl_flavor = pathconf(filename, _PC_ACL_ENABLED);
	if (acl_flavor == -1)
		return (-1);

	if (acl_flavor == _ACL_ACE_ENABLED)
		cntcmd = ACE_GETACLCNT;
	else
		cntcmd = GETACLCNT;

	aclcnt = acl(filename, cntcmd, 0, NULL);
	if (aclcnt > 0) {
		if (acl_flavor == _ACL_ACE_ENABLED) {
			acep = malloc(sizeof (ace_t) * aclcnt);
			if (acep == NULL)
				return (-1);
			if (acl(filename, ACE_GETACL,
			    aclcnt, acep) < 0) {
				free(acep);
				return (-1);
			}

			val = ace_trivial(acep, aclcnt);
			free(acep);

		} else if (aclcnt > MIN_ACL_ENTRIES)
			val = 1;
	}
	return (val);
}

static uint32_t
access_mask_set(int haswriteperm, int hasreadperm, int isowner, int isallow)
{
	uint32_t access_mask = 0;
	int acl_produce;
	int synchronize_set = 0, write_owner_set = 0;
	int delete_set = 0, write_attrs_set = 0;
	int read_named_set = 0, write_named_set = 0;

	acl_produce = (ACL_SYNCHRONIZE_SET_ALLOW |
	    ACL_WRITE_ATTRS_OWNER_SET_ALLOW |
	    ACL_WRITE_ATTRS_WRITER_SET_DENY);

	if (isallow) {
		synchronize_set = ACL_SYNCHRONIZE_SET_ALLOW;
		write_owner_set = ACL_WRITE_OWNER_SET_ALLOW;
		delete_set = ACL_DELETE_SET_ALLOW;
		if (hasreadperm)
			read_named_set = ACL_READ_NAMED_READER_SET_ALLOW;
		if (haswriteperm)
			write_named_set = ACL_WRITE_NAMED_WRITER_SET_ALLOW;
		if (isowner)
			write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_ALLOW;
		else if (haswriteperm)
			write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_ALLOW;
	} else {

		synchronize_set = ACL_SYNCHRONIZE_SET_DENY;
		write_owner_set = ACL_WRITE_OWNER_SET_DENY;
		delete_set = ACL_DELETE_SET_DENY;
		if (hasreadperm)
			read_named_set = ACL_READ_NAMED_READER_SET_DENY;
		if (haswriteperm)
			write_named_set = ACL_WRITE_NAMED_WRITER_SET_DENY;
		if (isowner)
			write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_DENY;
		else if (haswriteperm)
			write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_DENY;
		else
			/*
			 * If the entity is not the owner and does not
			 * have write permissions ACE_WRITE_ATTRIBUTES will
			 * always go in the DENY ACE.
			 */
			access_mask |= ACE_WRITE_ATTRIBUTES;
	}

	if (acl_produce & synchronize_set)
		access_mask |= ACE_SYNCHRONIZE;
	if (acl_produce & write_owner_set)
		access_mask |= ACE_WRITE_OWNER;
	if (acl_produce & delete_set)
		access_mask |= ACE_DELETE;
	if (acl_produce & write_attrs_set)
		access_mask |= ACE_WRITE_ATTRIBUTES;
	if (acl_produce & read_named_set)
		access_mask |= ACE_READ_NAMED_ATTRS;
	if (acl_produce & write_named_set)
		access_mask |= ACE_WRITE_NAMED_ATTRS;

	return (access_mask);
}

/*
 * Given an mode_t, convert it into an access_mask as used
 * by nfsace, assuming aclent_t -> nfsace semantics.
 */
static uint32_t
mode_to_ace_access(mode_t mode, int isdir, int isowner, int isallow)
{
	uint32_t access = 0;
	int haswriteperm = 0;
	int hasreadperm = 0;

	if (isallow) {
		haswriteperm = (mode & 02);
		hasreadperm = (mode & 04);
	} else {
		haswriteperm = !(mode & 02);
		hasreadperm = !(mode & 04);
	}

	/*
	 * The following call takes care of correctly setting the following
	 * mask bits in the access_mask:
	 * ACE_SYNCHRONIZE, ACE_WRITE_OWNER, ACE_DELETE,
	 * ACE_WRITE_ATTRIBUTES, ACE_WRITE_NAMED_ATTRS, ACE_READ_NAMED_ATTRS
	 */
	access = access_mask_set(haswriteperm, hasreadperm, isowner, isallow);

	if (isallow) {
		access |= ACE_READ_ACL | ACE_READ_ATTRIBUTES;
		if (isowner)
			access |= ACE_WRITE_ACL;
	} else {
		if (! isowner)
			access |= ACE_WRITE_ACL;
	}

	/* read */
	if (mode & 04) {
		access |= ACE_READ_DATA;
	}
	/* write */
	if (mode & 02) {
		access |= ACE_WRITE_DATA |
		    ACE_APPEND_DATA;
		if (isdir)
			access |= ACE_DELETE_CHILD;
	}
	/* exec */
	if (mode & 01) {
		access |= ACE_EXECUTE;
	}

	return (access);
}

/*
 * Given an nfsace (presumably an ALLOW entry), make a
 * corresponding DENY entry at the address given.
 */
static void
ace_make_deny(ace_t *allow, ace_t *deny, int isdir, int isowner)
{
	(void) memcpy(deny, allow, sizeof (ace_t));

	deny->a_who = allow->a_who;

	deny->a_type = ACE_ACCESS_DENIED_ACE_TYPE;
	deny->a_access_mask ^= ACE_POSIX_SUPPORTED_BITS;
	if (isdir)
		deny->a_access_mask ^= ACE_DELETE_CHILD;

	deny->a_access_mask &= ~(ACE_SYNCHRONIZE | ACE_WRITE_OWNER |
	    ACE_DELETE | ACE_WRITE_ATTRIBUTES | ACE_READ_NAMED_ATTRS |
	    ACE_WRITE_NAMED_ATTRS);
	deny->a_access_mask |= access_mask_set((allow->a_access_mask &
	    ACE_WRITE_DATA), (allow->a_access_mask & ACE_READ_DATA), isowner,
	    B_FALSE);
}
/*
 * Make an initial pass over an array of aclent_t's.  Gather
 * information such as an ACL_MASK (if any), number of users,
 * number of groups, and whether the array needs to be sorted.
 */
static int
ln_aent_preprocess(aclent_t *aclent, int n,
    int *hasmask, mode_t *mask,
    int *numuser, int *numgroup, int *needsort)
{
	int error = 0;
	int i;
	int curtype = 0;

	*hasmask = 0;
	*mask = 07;
	*needsort = 0;
	*numuser = 0;
	*numgroup = 0;

	for (i = 0; i < n; i++) {
		if (aclent[i].a_type < curtype)
			*needsort = 1;
		else if (aclent[i].a_type > curtype)
			curtype = aclent[i].a_type;
		if (aclent[i].a_type & USER)
			(*numuser)++;
		if (aclent[i].a_type & (GROUP | GROUP_OBJ))
			(*numgroup)++;
		if (aclent[i].a_type & CLASS_OBJ) {
			if (*hasmask) {
				error = EINVAL;
				goto out;
			} else {
				*hasmask = 1;
				*mask = aclent[i].a_perm;
			}
		}
	}

	if ((! *hasmask) && (*numuser + *numgroup > 1)) {
		error = EINVAL;
		goto out;
	}

out:
	return (error);
}

/*
 * Convert an array of aclent_t into an array of nfsace entries,
 * following POSIX draft -> nfsv4 conversion semantics as outlined in
 * the IETF draft.
 */
static int
ln_aent_to_ace(aclent_t *aclent, int n, ace_t **acepp, int *rescount, int isdir)
{
	int error = 0;
	mode_t mask;
	int numuser, numgroup, needsort;
	int resultsize = 0;
	int i, groupi = 0, skip;
	ace_t *acep, *result = NULL;
	int hasmask;

	error = ln_aent_preprocess(aclent, n, &hasmask, &mask,
	    &numuser, &numgroup, &needsort);
	if (error != 0)
		goto out;

	/* allow + deny for each aclent */
	resultsize = n * 2;
	if (hasmask) {
		/*
		 * stick extra deny on the group_obj and on each
		 * user|group for the mask (the group_obj was added
		 * into the count for numgroup)
		 */
		resultsize += numuser + numgroup;
		/* ... and don't count the mask itself */
		resultsize -= 2;
	}

	/* sort the source if necessary */
	if (needsort)
		ksort((caddr_t)aclent, n, sizeof (aclent_t), cmp2acls);

	result = acep = calloc(1, resultsize * sizeof (ace_t));
	if (result == NULL)
		goto out;

	for (i = 0; i < n; i++) {
		/*
		 * don't process CLASS_OBJ (mask); mask was grabbed in
		 * ln_aent_preprocess()
		 */
		if (aclent[i].a_type & CLASS_OBJ)
			continue;

		/* If we need an ACL_MASK emulator, prepend it now */
		if ((hasmask) &&
		    (aclent[i].a_type & (USER | GROUP | GROUP_OBJ))) {
			acep->a_type = ACE_ACCESS_DENIED_ACE_TYPE;
			acep->a_flags = 0;
			if (aclent[i].a_type & GROUP_OBJ) {
				acep->a_who = -1;
				acep->a_flags |=
				    (ACE_IDENTIFIER_GROUP|ACE_GROUP);
			} else if (aclent[i].a_type & USER) {
				acep->a_who = aclent[i].a_id;
			} else {
				acep->a_who = aclent[i].a_id;
				acep->a_flags |= ACE_IDENTIFIER_GROUP;
			}
			if (aclent[i].a_type & ACL_DEFAULT) {
				acep->a_flags |= ACE_INHERIT_ONLY_ACE |
				    ACE_FILE_INHERIT_ACE |
				    ACE_DIRECTORY_INHERIT_ACE;
			}
			/*
			 * Set the access mask for the prepended deny
			 * ace.  To do this, we invert the mask (found
			 * in ln_aent_preprocess()) then convert it to an
			 * DENY ace access_mask.
			 */
			acep->a_access_mask = mode_to_ace_access((mask ^ 07),
			    isdir, 0, 0);
			acep += 1;
		}

		/* handle a_perm -> access_mask */
		acep->a_access_mask = mode_to_ace_access(aclent[i].a_perm,
		    isdir, aclent[i].a_type & USER_OBJ, 1);

		/* emulate a default aclent */
		if (aclent[i].a_type & ACL_DEFAULT) {
			acep->a_flags |= ACE_INHERIT_ONLY_ACE |
			    ACE_FILE_INHERIT_ACE |
			    ACE_DIRECTORY_INHERIT_ACE;
		}

		/*
		 * handle a_perm and a_id
		 *
		 * this must be done last, since it involves the
		 * corresponding deny aces, which are handled
		 * differently for each different a_type.
		 */
		if (aclent[i].a_type & USER_OBJ) {
			acep->a_who = -1;
			acep->a_flags |= ACE_OWNER;
			ace_make_deny(acep, acep + 1, isdir, B_TRUE);
			acep += 2;
		} else if (aclent[i].a_type & USER) {
			acep->a_who = aclent[i].a_id;
			ace_make_deny(acep, acep + 1, isdir, B_FALSE);
			acep += 2;
		} else if (aclent[i].a_type & (GROUP_OBJ | GROUP)) {
			if (aclent[i].a_type & GROUP_OBJ) {
				acep->a_who = -1;
				acep->a_flags |= ACE_GROUP;
			} else {
				acep->a_who = aclent[i].a_id;
			}
			acep->a_flags |= ACE_IDENTIFIER_GROUP;
			/*
			 * Set the corresponding deny for the group ace.
			 *
			 * The deny aces go after all of the groups, unlike
			 * everything else, where they immediately follow
			 * the allow ace.
			 *
			 * We calculate "skip", the number of slots to
			 * skip ahead for the deny ace, here.
			 *
			 * The pattern is:
			 * MD1 A1 MD2 A2 MD3 A3 D1 D2 D3
			 * thus, skip is
			 * (2 * numgroup) - 1 - groupi
			 * (2 * numgroup) to account for MD + A
			 * - 1 to account for the fact that we're on the
			 * access (A), not the mask (MD)
			 * - groupi to account for the fact that we have
			 * passed up groupi number of MD's.
			 */
			skip = (2 * numgroup) - 1 - groupi;
			ace_make_deny(acep, acep + skip, isdir, B_FALSE);
			/*
			 * If we just did the last group, skip acep past
			 * all of the denies; else, just move ahead one.
			 */
			if (++groupi >= numgroup)
				acep += numgroup + 1;
			else
				acep += 1;
		} else if (aclent[i].a_type & OTHER_OBJ) {
			acep->a_who = -1;
			acep->a_flags |= ACE_EVERYONE;
			ace_make_deny(acep, acep + 1, isdir, B_FALSE);
			acep += 2;
		} else {
			error = EINVAL;
			goto out;
		}
	}

	*acepp = result;
	*rescount = resultsize;

out:
	if (error != 0) {
		if ((result != NULL) && (resultsize > 0)) {
			free(result);
		}
	}

	return (error);
}

static int
convert_aent_to_ace(aclent_t *aclentp, int aclcnt, int isdir,
    ace_t **retacep, int *retacecnt)
{
	ace_t *acep;
	ace_t *dfacep;
	ace_t *newacep;
	int acecnt = 0;
	int dfacecnt = 0;
	int dfaclstart = 0;
	int dfaclcnt = 0;
	aclent_t *aclp;
	int i;
	int error;

	ksort((caddr_t)aclentp, aclcnt, sizeof (aclent_t), cmp2acls);

	for (i = 0, aclp = aclentp; i < aclcnt; aclp++, i++) {
		if (aclp->a_type & ACL_DEFAULT)
			break;
	}

	if (i < aclcnt) {
		dfaclstart = aclcnt - i;
		dfaclcnt = i;
	}

	if (dfaclcnt && isdir == 0) {
		return (-1);
	}

	error = ln_aent_to_ace(aclentp, i,  &acep, &acecnt, isdir);
	if (error)
		return (-1);

	if (dfaclcnt) {
		error = ln_aent_to_ace(&aclentp[dfaclstart], dfaclcnt,
		    &dfacep, &dfacecnt, isdir);
		if (error) {
			if (acep) {
				free(acep);
			}
			return (-1);
		}
	}

	newacep = malloc(sizeof (ace_t) * (acecnt + dfacecnt));
	if (newacep == NULL)
		return (-1);

	(void) memcpy(newacep, acep, sizeof (ace_t) * acecnt);
	if (dfaclcnt) {
		(void) memcpy(newacep + acecnt, dfacep,
		    sizeof (ace_t) * dfacecnt);
	}
	free(acep);
	if (dfaclcnt)
		free(dfacep);

	*retacecnt = acecnt + dfacecnt;
	*retacep = newacep;
	return (0);
}


static int
cacl_get(acl_inp inp, int get_flag, int type, acl_t **aclp)
{
	const char *fname;
	int fd;
	int ace_acl = 0;
	int error;
	int getcmd, cntcmd;
	acl_t *acl_info;
	int	save_errno;
	int	stat_error;
	struct stat64 statbuf;

	*aclp = NULL;
	if (type == ACL_PATH) {
		fname = inp.file;
		ace_acl = pathconf(fname, _PC_ACL_ENABLED);
	} else {
		fd = inp.fd;
		ace_acl = fpathconf(fd, _PC_ACL_ENABLED);
	}

	if (ace_acl == -1)
		return (-1);

	/*
	 * if acl's aren't supported then
	 * send it through the old GETACL interface
	 */
	if (ace_acl == 0) {
		ace_acl = _ACL_ACLENT_ENABLED;
	}

	if (ace_acl & _ACL_ACE_ENABLED) {
		cntcmd = ACE_GETACLCNT;
		getcmd = ACE_GETACL;
		acl_info = acl_alloc(ACE_T);
	} else {
		cntcmd = GETACLCNT;
		getcmd = GETACL;
		acl_info = acl_alloc(ACLENT_T);
	}

	if (acl_info == NULL)
		return (-1);

	if (type == ACL_PATH) {
		acl_info->acl_cnt = acl(fname, cntcmd, 0, NULL);
	} else {
		acl_info->acl_cnt = facl(fd, cntcmd, 0, NULL);
	}

	save_errno = errno;
	if (acl_info->acl_cnt < 0) {
		acl_free(acl_info);
		errno = save_errno;
		return (-1);
	}

	if (acl_info->acl_cnt == 0) {
		acl_free(acl_info);
		errno = save_errno;
		return (0);
	}

	acl_info->acl_aclp =
	    malloc(acl_info->acl_cnt * acl_info->acl_entry_size);
	save_errno = errno;

	if (acl_info->acl_aclp == NULL) {
		acl_free(acl_info);
		errno = save_errno;
		return (-1);
	}

	if (type == ACL_PATH) {
		stat_error = stat64(fname, &statbuf);
		error = acl(fname, getcmd, acl_info->acl_cnt,
		    acl_info->acl_aclp);
	} else {
		stat_error = fstat64(fd, &statbuf);
		error = facl(fd, getcmd, acl_info->acl_cnt,
		    acl_info->acl_aclp);
	}

	save_errno = errno;
	if (error == -1) {
		acl_free(acl_info);
		errno = save_errno;
		return (-1);
	}


	if (stat_error == 0) {
		acl_info->acl_flags =
		    (S_ISDIR(statbuf.st_mode) ? ACL_IS_DIR : 0);
	} else
		acl_info->acl_flags = 0;

	switch (acl_info->acl_type) {
	case ACLENT_T:
		if (acl_info->acl_cnt <= MIN_ACL_ENTRIES)
			acl_info->acl_flags |= ACL_IS_TRIVIAL;
		break;
	case ACE_T:
		if (ace_trivial(acl_info->acl_aclp, acl_info->acl_cnt) == 0)
			acl_info->acl_flags |= ACL_IS_TRIVIAL;
		break;
	default:
		errno = EINVAL;
		acl_free(acl_info);
		return (-1);
	}

	if ((acl_info->acl_flags & ACL_IS_TRIVIAL) &&
	    (get_flag & ACL_NO_TRIVIAL)) {
		acl_free(acl_info);
		errno = 0;
		return (0);
	}

	*aclp = acl_info;
	return (0);
}

/*
 * return -1 on failure, otherwise the number of acl
 * entries is returned
 */
int
acl_get(const char *path, int get_flag, acl_t **aclp)
{
	acl_inp acl_inp;
	acl_inp.file = path;

	return (cacl_get(acl_inp, get_flag, ACL_PATH, aclp));
}

int
facl_get(int fd, int get_flag, acl_t **aclp)
{

	acl_inp acl_inp;
	acl_inp.fd = fd;

	return (cacl_get(acl_inp, get_flag, ACL_FD, aclp));
}

/*
 * Set an ACL, translates acl to ace_t when appropriate.
 */
static int
cacl_set(acl_inp *acl_inp, acl_t *aclp, int type)
{
	int error = 0;
	int acl_flavor_target;
	ace_t *acep = NULL;
	int acecnt;
	struct stat64 statbuf;
	int stat_error;
	int isdir;


	if (type == ACL_PATH) {
		stat_error = stat64(acl_inp->file, &statbuf);
		if (stat_error)
			return (-1);
		acl_flavor_target = pathconf(acl_inp->file, _PC_ACL_ENABLED);
	} else {
		stat_error = fstat64(acl_inp->fd, &statbuf);
		if (stat_error)
			return (-1);
		acl_flavor_target = fpathconf(acl_inp->fd, _PC_ACL_ENABLED);
	}

	isdir = S_ISDIR(statbuf.st_mode);

	if (acl_flavor_target == -1)
		return (-1);

	/*
	 * Translate aclent_t ACL's to ACE ACL's.
	 */
	if (acl_flavor_target ==  _ACL_ACE_ENABLED &&
	    aclp->acl_type == ACLENT_T) {
		error = convert_aent_to_ace(aclp->acl_aclp,
		    aclp->acl_cnt, isdir, &acep, &acecnt);
		if (error) {
			errno = ENOTSUP;
			return (-1);
		}
		/*
		 * replace old acl with newly translated acl
		 */
		free(aclp->acl_aclp);
		aclp->acl_aclp = acep;
		aclp->acl_cnt = acecnt;
		aclp->acl_type = ACE_T;
	}

	if (type == ACL_PATH) {
		error = acl(acl_inp->file,
		    (aclp->acl_type == ACE_T) ? ACE_SETACL : SETACL,
		    aclp->acl_cnt, aclp->acl_aclp);
	} else {
		error = facl(acl_inp->fd,
		    (aclp->acl_type == ACE_T) ? ACE_SETACL : SETACL,
		    aclp->acl_cnt, aclp->acl_aclp);
	}

	return (error);
}

int
acl_set(const char *path, acl_t *aclp)
{
	acl_inp acl_inp;

	acl_inp.file = path;

	return (cacl_set(&acl_inp, aclp, ACL_PATH));
}

int
facl_set(int fd, acl_t *aclp)
{
	acl_inp acl_inp;

	acl_inp.fd = fd;

	return (cacl_set(&acl_inp, aclp, ACL_FD));
}

int
acl_cnt(acl_t *aclp)
{
	return (aclp->acl_cnt);
}

int
acl_type(acl_t *aclp)
{
	return (aclp->acl_type);
}

acl_t *
acl_dup(acl_t *aclp)
{
	acl_t *newaclp;

	newaclp = acl_alloc(aclp->acl_type);
	if (newaclp == NULL)
		return (NULL);

	newaclp->acl_aclp = malloc(aclp->acl_entry_size * aclp->acl_cnt);
	if (newaclp->acl_aclp == NULL) {
		acl_free(newaclp);
		return (NULL);
	}

	(void) memcpy(newaclp->acl_aclp,
	    aclp->acl_aclp, aclp->acl_entry_size * aclp->acl_cnt);
	newaclp->acl_cnt = aclp->acl_cnt;

	return (newaclp);
}

int
acl_flags(acl_t *aclp)
{
	return (aclp->acl_flags);
}

void *
acl_data(acl_t *aclp)
{
	return (aclp->acl_aclp);
}

/*
 * Remove an ACL from a file and create a trivial ACL based
 * off of the mode argument.  After acl has been set owner/group
 * are updated to match owner,group arguments
 */
int
acl_strip(const char *file, uid_t owner, gid_t group, mode_t mode)
{
	int	error = 0;
	aclent_t min_acl[MIN_ACL_ENTRIES];
	ace_t	min_ace_acl[6];	/* owner, group, everyone + complement denies */
	int	acl_flavor;
	int	aclcnt;

	acl_flavor = pathconf(file, _PC_ACL_ENABLED);

	if (acl_flavor == -1)
		return (-1);
	/*
	 * force it through aclent flavor when file system doesn't
	 * understand question
	 */
	if (acl_flavor == 0)
		acl_flavor = _ACL_ACLENT_ENABLED;

	if (acl_flavor & _ACL_ACLENT_ENABLED) {
		min_acl[0].a_type = USER_OBJ;
		min_acl[0].a_id   = owner;
		min_acl[0].a_perm = ((mode & 0700) >> 6);
		min_acl[1].a_type = GROUP_OBJ;
		min_acl[1].a_id   = group;
		min_acl[1].a_perm = ((mode & 0070) >> 3);
		min_acl[2].a_type = CLASS_OBJ;
		min_acl[2].a_id   = (uid_t)-1;
		min_acl[2].a_perm = ((mode & 0070) >> 3);
		min_acl[3].a_type = OTHER_OBJ;
		min_acl[3].a_id   = (uid_t)-1;
		min_acl[3].a_perm = (mode & 0007);
		aclcnt = 4;
		error = acl(file, SETACL, aclcnt, min_acl);
	} else if (acl_flavor & _ACL_ACE_ENABLED) {
		(void) memcpy(min_ace_acl, trivial_acl, sizeof (ace_t) * 6);

		/*
		 * Make aces match request mode
		 */
		adjust_ace_pair(&min_ace_acl[0], (mode & 0700) >> 6);
		adjust_ace_pair(&min_ace_acl[2], (mode & 0070) >> 3);
		adjust_ace_pair(&min_ace_acl[4], mode & 0007);

		error = acl(file, ACE_SETACL, 6, min_ace_acl);
	} else {
		errno = EINVAL;
		error = 1;
	}

	if (error == 0)
		error = chown(file, owner, group);
	return (error);
}

static int
ace_match(void *entry1, void *entry2)
{
	ace_t *p1 = (ace_t *)entry1;
	ace_t *p2 = (ace_t *)entry2;
	ace_t ace1, ace2;

	ace1 = *p1;
	ace2 = *p2;

	/*
	 * Need to fixup who field for abstrations for
	 * accurate comparison, since field is undefined.
	 */
	if (ace1.a_flags & (ACE_OWNER|ACE_GROUP|ACE_EVERYONE))
		ace1.a_who = -1;
	if (ace2.a_flags & (ACE_OWNER|ACE_GROUP|ACE_EVERYONE))
		ace2.a_who = -1;
	return (memcmp(&ace1, &ace2, sizeof (ace_t)));
}

static int
aclent_match(void *entry1, void *entry2)
{
	aclent_t *aclent1 = (aclent_t *)entry1;
	aclent_t *aclent2 = (aclent_t *)entry2;

	return (memcmp(aclent1, aclent2, sizeof (aclent_t)));
}

/*
 * Find acl entries in acl that correspond to removeacl.  Search
 * is started from slot.  The flag argument indicates whether to
 * remove all matches or just the first match.
 */
int
acl_removeentries(acl_t *acl, acl_t *removeacl, int start_slot, int flag)
{
	int i, j;
	int match;
	int (*acl_match)(void *acl1, void *acl2);
	void *acl_entry, *remove_entry;
	void *start;
	int found = 0;

	if (flag != ACL_REMOVE_ALL && flag != ACL_REMOVE_FIRST)
		flag = ACL_REMOVE_FIRST;

	if (acl == NULL || removeacl == NULL)
		return (EACL_NO_ACL_ENTRY);

	if (acl->acl_type != removeacl->acl_type)
		return (EACL_DIFF_TYPE);

	if (acl->acl_type == ACLENT_T)
		acl_match = aclent_match;
	else
		acl_match = ace_match;

	for (i = 0, remove_entry = removeacl->acl_aclp;
	    i != removeacl->acl_cnt; i++) {

		j = 0;
		acl_entry = (char *)acl->acl_aclp +
		    (acl->acl_entry_size * start_slot);
		for (;;) {
			match = acl_match(acl_entry, remove_entry);
			if (match == 0)  {
				found++;
				start = (char *)acl_entry +
				    acl->acl_entry_size;
				(void) memmove(acl_entry, start,
				    acl->acl_entry_size *
				    acl->acl_cnt-- - (j + 1));

				if (flag == ACL_REMOVE_FIRST)
					break;
				/*
				 * List has changed, restart search from
				 * beginning.
				 */
				acl_entry = acl->acl_aclp;
				j = 0;
				continue;
			}
			acl_entry = ((char *)acl_entry + acl->acl_entry_size);
			if (++j >= acl->acl_cnt) {
				break;
			}
		}
	}

	return ((found == 0) ? EACL_NO_ACL_ENTRY : 0);
}

/*
 * Replace entires entries in acl1 with the corresponding entries
 * in newentries.  The where argument specifies where to begin
 * the replacement.  If the where argument is 1 greater than the
 * number of acl entries in acl1 then they are appended.  If the
 * where argument is 2+ greater than the number of acl entries then
 * EACL_INVALID_SLOT is returned.
 */
int
acl_modifyentries(acl_t *acl1, acl_t *newentries, int where)
{

	int slot;
	int slots_needed;
	int slots_left;
	int newsize;

	if (acl1 == NULL || newentries == NULL)
		return (EACL_NO_ACL_ENTRY);

	if (where < 0 || where >= acl1->acl_cnt)
		return (EACL_INVALID_SLOT);

	if (acl1->acl_type != newentries->acl_type)
		return (EACL_DIFF_TYPE);

	slot = where;

	slots_left = acl1->acl_cnt - slot + 1;
	if (slots_left < newentries->acl_cnt) {
		slots_needed = newentries->acl_cnt - slots_left;
		newsize = (acl1->acl_entry_size * acl1->acl_cnt) +
		    (acl1->acl_entry_size * slots_needed);
		acl1->acl_aclp = realloc(acl1->acl_aclp, newsize);
		if (acl1->acl_aclp == NULL)
			return (-1);
	}
	(void) memcpy((char *)acl1->acl_aclp + (acl1->acl_entry_size * slot),
	    newentries->acl_aclp,
	    newentries->acl_entry_size * newentries->acl_cnt);

	/*
	 * Did ACL grow?
	 */

	if ((slot + newentries->acl_cnt) > acl1->acl_cnt) {
		acl1->acl_cnt = slot + newentries->acl_cnt;
	}

	return (0);
}

/*
 * Add acl2 entries into acl1.  The where argument specifies where
 * to add the entries.
 */
int
acl_addentries(acl_t *acl1, acl_t *acl2, int where)
{

	int newsize;
	int len;
	void *start;
	void *to;

	if (acl1 == NULL || acl2 == NULL)
		return (EACL_NO_ACL_ENTRY);

	if (acl1->acl_type != acl2->acl_type)
		return (EACL_DIFF_TYPE);

	/*
	 * allow where to specify 1 past last slot for an append operation
	 * but anything greater is an error.
	 */
	if (where < 0 || where > acl1->acl_cnt)
		return (EACL_INVALID_SLOT);

	newsize = (acl2->acl_entry_size * acl2->acl_cnt) +
	    (acl1->acl_entry_size * acl1->acl_cnt);
	acl1->acl_aclp = realloc(acl1->acl_aclp, newsize);
	if (acl1->acl_aclp == NULL)
		return (-1);

	/*
	 * first push down entries where new ones will be inserted
	 */

	to = (void *)((char *)acl1->acl_aclp +
	    ((where + acl2->acl_cnt) * acl1->acl_entry_size));

	start = (void *)((char *)acl1->acl_aclp +
	    where * acl1->acl_entry_size);

	if (where < acl1->acl_cnt) {
		len = (acl1->acl_cnt - where) * acl1->acl_entry_size;
		(void) memmove(to, start, len);
	}

	/*
	 * now stick in new entries.
	 */

	(void) memmove(start, acl2->acl_aclp,
	    acl2->acl_cnt * acl2->acl_entry_size);

	acl1->acl_cnt += acl2->acl_cnt;
	return (0);
}

static void
aclent_perms(int perm, char *txt_perms)
{
	if (perm & S_IROTH)
		txt_perms[0] = 'r';
	else
		txt_perms[0] = '-';
	if (perm & S_IWOTH)
		txt_perms[1] = 'w';
	else
		txt_perms[1] = '-';
	if (perm & S_IXOTH)
		txt_perms[2] = 'x';
	else
		txt_perms[2] = '-';
	txt_perms[3] = '\0';
}

static char *
pruname(uid_t uid)
{
	struct passwd	*passwdp;
	static char	uidp[10];	/* big enough */

	passwdp = getpwuid(uid);
	if (passwdp == (struct passwd *)NULL) {
		/* could not get passwd information: display uid instead */
		(void) sprintf(uidp, "%ld", (long)uid);
		return (uidp);
	} else
		return (passwdp->pw_name);
}

static char *
prgname(gid_t gid)
{
	struct group	*groupp;
	static char	gidp[10];	/* big enough */

	groupp = getgrgid(gid);
	if (groupp == (struct group *)NULL) {
		/* could not get group information: display gid instead */
		(void) sprintf(gidp, "%ld", (long)gid);
		return (gidp);
	} else
		return (groupp->gr_name);
}
static void
aclent_printacl(acl_t *aclp)
{
	aclent_t *tp;
	int aclcnt;
	int mask;
	int slot = 0;
	char perm[4];

	/* display ACL: assume it is sorted. */
	aclcnt = aclp->acl_cnt;
	for (tp = aclp->acl_aclp; aclcnt--; tp++) {
		if (tp->a_type == CLASS_OBJ)
			mask = tp->a_perm;
	}
	aclcnt = aclp->acl_cnt;
	for (tp = aclp->acl_aclp; aclcnt--; tp++) {
		(void) printf("     %d:", slot++);
		switch (tp->a_type) {
		case USER:
			aclent_perms(tp->a_perm, perm);
			(void) printf("user:%s:%s\t\t",
			    pruname(tp->a_id), perm);
			aclent_perms((tp->a_perm & mask), perm);
			(void) printf("#effective:%s\n", perm);
			break;
		case USER_OBJ:
			/* no need to display uid */
			aclent_perms(tp->a_perm, perm);
			(void) printf("user::%s\n", perm);
			break;
		case GROUP:
			aclent_perms(tp->a_perm, perm);
			(void) printf("group:%s:%s\t\t",
			    prgname(tp->a_id), perm);
			aclent_perms(tp->a_perm & mask, perm);
			(void) printf("#effective:%s\n", perm);
			break;
		case GROUP_OBJ:
			aclent_perms(tp->a_perm, perm);
			(void) printf("group::%s\t\t", perm);
			aclent_perms(tp->a_perm & mask, perm);
			(void) printf("#effective:%s\n", perm);
			break;
		case CLASS_OBJ:
			aclent_perms(tp->a_perm, perm);
			(void) printf("mask:%s\n", perm);
			break;
		case OTHER_OBJ:
			aclent_perms(tp->a_perm, perm);
			(void) printf("other:%s\n", perm);
			break;
		case DEF_USER:
			aclent_perms(tp->a_perm, perm);
			(void) printf("default:user:%s:%s\n",
			    pruname(tp->a_id), perm);
			break;
		case DEF_USER_OBJ:
			aclent_perms(tp->a_perm, perm);
			(void) printf("default:user::%s\n", perm);
			break;
		case DEF_GROUP:
			aclent_perms(tp->a_perm, perm);
			(void) printf("default:group:%s:%s\n",
			    prgname(tp->a_id), perm);
			break;
		case DEF_GROUP_OBJ:
			aclent_perms(tp->a_perm, perm);
			(void) printf("default:group::%s\n", perm);
			break;
		case DEF_CLASS_OBJ:
			aclent_perms(tp->a_perm, perm);
			(void) printf("default:mask:%s\n", perm);
			break;
		case DEF_OTHER_OBJ:
			aclent_perms(tp->a_perm, perm);
			(void) printf("default:other:%s\n", perm);
			break;
		default:
			(void) fprintf(stderr,
			    gettext("unrecognized entry\n"));
			break;
		}
	}
}

static void
split_line(char *str, int cols)
{
	char *ptr;
	int len;
	int i;
	int last_split;
	char pad[11];
	int pad_len;

	len = strlen(str);
	ptr = str;
	(void) strcpy(pad, "");
	pad_len = 0;

	ptr = str;
	last_split = 0;
	for (i = 0; i != len; i++) {
		if ((i + pad_len + 4) >= cols) {
			(void) printf("%s%.*s\n", pad, last_split, ptr);
			ptr = &ptr[last_split];
			len = strlen(ptr);
			i = 0;
			pad_len = 4;
			(void) strcpy(pad, "         ");
		} else {
			if (ptr[i] == '/' || ptr[i] == ':') {
				last_split = i;
			}
		}
	}
	if (i == len) {
		(void) printf("%s%s\n", pad, ptr);
	}
}

static void
ace_printacl(acl_t *aclp, int cols)
{
	int  slot = 0;
	char *token;
	char *acltext;

	acltext = acl_totext(aclp);

	if (acltext == NULL)
		return;

	token = strtok(acltext, ",");
	if (token == NULL) {
		free(acltext);
		return;
	}

	do {
		(void) printf("     %d:", slot++);
		split_line(token, cols - 5);
	} while (token = strtok(NULL, ","));
	free(acltext);
}

/*
 * pretty print an ACL.
 * For aclent_t ACL's the format is
 * similar to the old format used by getfacl,
 * with the addition of adding a "slot" number
 * before each entry.
 *
 * for ace_t ACL's the cols variable will break up
 * the long lines into multiple lines and will also
 * print a "slot" number.
 */
void
acl_printacl(acl_t *aclp, int cols)
{

	switch (aclp->acl_type) {
	case ACLENT_T:
		aclent_printacl(aclp);
		break;
	case ACE_T:
		ace_printacl(aclp, cols);
		break;
	}
}


/*
 * return text for an ACL error.
 */
char *
acl_strerror(int errnum)
{
	switch (errnum) {
	case EACL_GRP_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "There is more than one user group owner entry"));
	case EACL_USER_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "There is more than one user owner entry"));
	case EACL_OTHER_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "There is more than one other entry"));
	case EACL_CLASS_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "There is more than one mask entry"));
	case EACL_DUPLICATE_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "Duplicate user or group entries"));
	case EACL_MISS_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "Missing user/group owner, other, mask entry"));
	case EACL_MEM_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "Memory error"));
	case EACL_ENTRY_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "Unrecognized entry type"));
	case EACL_INHERIT_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "Invalid inheritance flags"));
	case EACL_FLAGS_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "Unrecognized entry flags"));
	case EACL_PERM_MASK_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "Invalid ACL permissions"));
	case EACL_COUNT_ERROR:
		return (dgettext(TEXT_DOMAIN,
		    "Invalid ACL count"));
	case EACL_INVALID_SLOT:
		return (dgettext(TEXT_DOMAIN,
		    "Invalid ACL entry number specified"));
	case EACL_NO_ACL_ENTRY:
		return (dgettext(TEXT_DOMAIN,
		    "ACL entry doesn't exist"));
	case EACL_DIFF_TYPE:
		return (dgettext(TEXT_DOMAIN,
		    "ACL type's are different"));
	case EACL_INVALID_USER_GROUP:
		return (dgettext(TEXT_DOMAIN, "Invalid user or group"));
	case EACL_INVALID_STR:
		return (dgettext(TEXT_DOMAIN, "ACL string is invalid"));
	case EACL_FIELD_NOT_BLANK:
		return (dgettext(TEXT_DOMAIN, "Field expected to be blank"));
	case EACL_INVALID_ACCESS_TYPE:
		return (dgettext(TEXT_DOMAIN, "Invalid access type"));
	case EACL_UNKNOWN_DATA:
		return (dgettext(TEXT_DOMAIN, "Unrecognized entry"));
	case EACL_MISSING_FIELDS:
		return (dgettext(TEXT_DOMAIN,
		    "ACL specification missing required fields"));
	case EACL_INHERIT_NOTDIR:
		return (dgettext(TEXT_DOMAIN,
		    "Inheritance flags are only allowed on directories"));
	case -1:
		return (strerror(errno));
	default:
		errno = EINVAL;
		return (dgettext(TEXT_DOMAIN, "Unknown error"));
	}
}