archive_disk_acl_freebsd.c

/*-
 * Copyright (c) 2003-2009 Tim Kientzle
 * Copyright (c) 2010-2012 Michihiro NAKAJIMA
 * Copyright (c) 2017 Martin Matuska
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "archive_platform.h"

#if ARCHIVE_ACL_FREEBSD

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_ACL_H
#define _ACL_PRIVATE /* For debugging */
#include <sys/acl.h>
#endif

#include "archive_entry.h"
#include "archive_private.h"
#include "archive_read_disk_private.h"
#include "archive_write_disk_private.h"

typedef struct {
	const int a_perm;	/* Libarchive permission or flag */
	const int p_perm;	/* Platform permission or flag */
} acl_perm_map_t;

static const acl_perm_map_t acl_posix_perm_map[] = {
	{ARCHIVE_ENTRY_ACL_EXECUTE, ACL_EXECUTE},
	{ARCHIVE_ENTRY_ACL_WRITE, ACL_WRITE},
	{ARCHIVE_ENTRY_ACL_READ, ACL_READ},
};

static const int acl_posix_perm_map_size =
    (int)(sizeof(acl_posix_perm_map)/sizeof(acl_posix_perm_map[0]));

#if ARCHIVE_ACL_FREEBSD_NFS4
static const acl_perm_map_t acl_nfs4_perm_map[] = {
	{ARCHIVE_ENTRY_ACL_EXECUTE, ACL_EXECUTE},
	{ARCHIVE_ENTRY_ACL_READ_DATA, ACL_READ_DATA},
	{ARCHIVE_ENTRY_ACL_LIST_DIRECTORY, ACL_LIST_DIRECTORY},
	{ARCHIVE_ENTRY_ACL_WRITE_DATA, ACL_WRITE_DATA},
	{ARCHIVE_ENTRY_ACL_ADD_FILE, ACL_ADD_FILE},
	{ARCHIVE_ENTRY_ACL_APPEND_DATA, ACL_APPEND_DATA},
	{ARCHIVE_ENTRY_ACL_ADD_SUBDIRECTORY, ACL_ADD_SUBDIRECTORY},
	{ARCHIVE_ENTRY_ACL_READ_NAMED_ATTRS, ACL_READ_NAMED_ATTRS},
	{ARCHIVE_ENTRY_ACL_WRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS},
	{ARCHIVE_ENTRY_ACL_DELETE_CHILD, ACL_DELETE_CHILD},
	{ARCHIVE_ENTRY_ACL_READ_ATTRIBUTES, ACL_READ_ATTRIBUTES},
	{ARCHIVE_ENTRY_ACL_WRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES},
	{ARCHIVE_ENTRY_ACL_DELETE, ACL_DELETE},
	{ARCHIVE_ENTRY_ACL_READ_ACL, ACL_READ_ACL},
	{ARCHIVE_ENTRY_ACL_WRITE_ACL, ACL_WRITE_ACL},
	{ARCHIVE_ENTRY_ACL_WRITE_OWNER, ACL_WRITE_OWNER},
	{ARCHIVE_ENTRY_ACL_SYNCHRONIZE, ACL_SYNCHRONIZE}
};

static const int acl_nfs4_perm_map_size =
    (int)(sizeof(acl_nfs4_perm_map)/sizeof(acl_nfs4_perm_map[0]));

static const acl_perm_map_t acl_nfs4_flag_map[] = {
	{ARCHIVE_ENTRY_ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_FILE_INHERIT},
	{ARCHIVE_ENTRY_ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT},
	{ARCHIVE_ENTRY_ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_NO_PROPAGATE_INHERIT},
	{ARCHIVE_ENTRY_ACL_ENTRY_INHERIT_ONLY, ACL_ENTRY_INHERIT_ONLY},
	{ARCHIVE_ENTRY_ACL_ENTRY_SUCCESSFUL_ACCESS, ACL_ENTRY_SUCCESSFUL_ACCESS},
	{ARCHIVE_ENTRY_ACL_ENTRY_FAILED_ACCESS, ACL_ENTRY_FAILED_ACCESS},
#ifdef ACL_ENTRY_INHERITED
	{ARCHIVE_ENTRY_ACL_ENTRY_INHERITED, ACL_ENTRY_INHERITED}
#endif
};

static const int acl_nfs4_flag_map_size =
    (int)(sizeof(acl_nfs4_flag_map)/sizeof(acl_nfs4_flag_map[0]));
#endif /* ARCHIVE_ACL_FREEBSD_NFS4 */

static int
translate_acl(struct archive_read_disk *a,
    struct archive_entry *entry, acl_t acl, int default_entry_acl_type)
{
#if ARCHIVE_ACL_FREEBSD_NFS4
	int brand;
	acl_flagset_t	 acl_flagset;
	acl_entry_type_t acl_type;
#endif
	acl_tag_t	 acl_tag;
	acl_entry_t	 acl_entry;
	acl_permset_t	 acl_permset;
	int		 i, entry_acl_type, perm_map_size;
	const acl_perm_map_t	*perm_map;
	int		 r, s, ae_id, ae_tag, ae_perm;
	void		*q;
	const char	*ae_name;

#if ARCHIVE_ACL_FREEBSD_NFS4
	// FreeBSD "brands" ACLs as POSIX.1e or NFSv4
	// Make sure the "brand" on this ACL is consistent
	// with the default_entry_acl_type bits provided.
	if (acl_get_brand_np(acl, &brand) != 0) {
		archive_set_error(&a->archive, errno,
		    "Failed to read ACL brand");
		return (ARCHIVE_WARN);
	}
	switch (brand) {
	case ACL_BRAND_POSIX:
		switch (default_entry_acl_type) {
		case ARCHIVE_ENTRY_ACL_TYPE_ACCESS:
		case ARCHIVE_ENTRY_ACL_TYPE_DEFAULT:
			break;
		default:
			archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
			    "Invalid ACL entry type for POSIX.1e ACL");
			return (ARCHIVE_WARN);
		}
		break;
	case ACL_BRAND_NFS4:
		if (default_entry_acl_type & ~ARCHIVE_ENTRY_ACL_TYPE_NFS4) {
			archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
			    "Invalid ACL entry type for NFSv4 ACL");
			return (ARCHIVE_WARN);
		}
		break;
	default:
		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
		    "Unknown ACL brand");
		return (ARCHIVE_WARN);
	}
#endif

	s = acl_get_entry(acl, ACL_FIRST_ENTRY, &acl_entry);
	if (s == -1) {
		archive_set_error(&a->archive, errno,
		    "Failed to get first ACL entry");
		return (ARCHIVE_WARN);
	}

	while (s == 1) {
		ae_id = -1;
		ae_name = NULL;
		ae_perm = 0;

		if (acl_get_tag_type(acl_entry, &acl_tag) != 0) {
			archive_set_error(&a->archive, errno,
			    "Failed to get ACL tag type");
			return (ARCHIVE_WARN);
		}
		switch (acl_tag) {
		case ACL_USER:
			q = acl_get_qualifier(acl_entry);
			if (q != NULL) {
				ae_id = (int)*(uid_t *)q;
				acl_free(q);
				ae_name = archive_read_disk_uname(&a->archive,
				    ae_id);
			}
			ae_tag = ARCHIVE_ENTRY_ACL_USER;
			break;
		case ACL_GROUP:
			q = acl_get_qualifier(acl_entry);
			if (q != NULL) {
				ae_id = (int)*(gid_t *)q;
				acl_free(q);
				ae_name = archive_read_disk_gname(&a->archive,
				    ae_id);
			}
			ae_tag = ARCHIVE_ENTRY_ACL_GROUP;
			break;
		case ACL_MASK:
			ae_tag = ARCHIVE_ENTRY_ACL_MASK;
			break;
		case ACL_USER_OBJ:
			ae_tag = ARCHIVE_ENTRY_ACL_USER_OBJ;
			break;
		case ACL_GROUP_OBJ:
			ae_tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
			break;
		case ACL_OTHER:
			ae_tag = ARCHIVE_ENTRY_ACL_OTHER;
			break;
#if ARCHIVE_ACL_FREEBSD_NFS4
		case ACL_EVERYONE:
			ae_tag = ARCHIVE_ENTRY_ACL_EVERYONE;
			break;
#endif
		default:
			/* Skip types that libarchive can't support. */
			s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry);
			continue;
		}

		// XXX acl_type maps to allow/deny/audit/YYYY bits
		entry_acl_type = default_entry_acl_type;

#if ARCHIVE_ACL_FREEBSD_NFS4
		if (default_entry_acl_type & ARCHIVE_ENTRY_ACL_TYPE_NFS4) {
			/*
			 * acl_get_entry_type_np() fails with non-NFSv4 ACLs
			 */
			if (acl_get_entry_type_np(acl_entry, &acl_type) != 0) {
				archive_set_error(&a->archive, errno, "Failed "
				    "to get ACL type from a NFSv4 ACL entry");
				return (ARCHIVE_WARN);
			}
			switch (acl_type) {
			case ACL_ENTRY_TYPE_ALLOW:
				entry_acl_type = ARCHIVE_ENTRY_ACL_TYPE_ALLOW;
				break;
			case ACL_ENTRY_TYPE_DENY:
				entry_acl_type = ARCHIVE_ENTRY_ACL_TYPE_DENY;
				break;
			case ACL_ENTRY_TYPE_AUDIT:
				entry_acl_type = ARCHIVE_ENTRY_ACL_TYPE_AUDIT;
				break;
			case ACL_ENTRY_TYPE_ALARM:
				entry_acl_type = ARCHIVE_ENTRY_ACL_TYPE_ALARM;
				break;
			default:
				archive_set_error(&a->archive, errno,
				    "Invalid NFSv4 ACL entry type");
				return (ARCHIVE_WARN);
			}

			/*
			 * Libarchive stores "flag" (NFSv4 inheritance bits)
			 * in the ae_perm bitmap.
			 *
			 * acl_get_flagset_np() fails with non-NFSv4 ACLs
			 */
			if (acl_get_flagset_np(acl_entry, &acl_flagset) != 0) {
				archive_set_error(&a->archive, errno,
				    "Failed to get flagset from a NFSv4 "
				    "ACL entry");
				return (ARCHIVE_WARN);
			}
			for (i = 0; i < acl_nfs4_flag_map_size; ++i) {
				r = acl_get_flag_np(acl_flagset,
				    acl_nfs4_flag_map[i].p_perm);
				if (r == -1) {
					archive_set_error(&a->archive, errno,
					    "Failed to check flag in a NFSv4 "
					    "ACL flagset");
					return (ARCHIVE_WARN);
				} else if (r)
					ae_perm |= acl_nfs4_flag_map[i].a_perm;
			}
		}
#endif

		if (acl_get_permset(acl_entry, &acl_permset) != 0) {
			archive_set_error(&a->archive, errno,
			    "Failed to get ACL permission set");
			return (ARCHIVE_WARN);
		}

#if ARCHIVE_ACL_FREEBSD_NFS4
		if (default_entry_acl_type & ARCHIVE_ENTRY_ACL_TYPE_NFS4) {
			perm_map_size = acl_nfs4_perm_map_size;
			perm_map = acl_nfs4_perm_map;
		} else {
#endif
			perm_map_size = acl_posix_perm_map_size;
			perm_map = acl_posix_perm_map;
#if ARCHIVE_ACL_FREEBSD_NFS4
		}
#endif

		for (i = 0; i < perm_map_size; ++i) {
			r = acl_get_perm_np(acl_permset, perm_map[i].p_perm);
			if (r == -1) {
				archive_set_error(&a->archive, errno,
				    "Failed to check permission in an ACL "
				    "permission set");
				return (ARCHIVE_WARN);
			} else if (r)
				ae_perm |= perm_map[i].a_perm;
		}

		archive_entry_acl_add_entry(entry, entry_acl_type,
					    ae_perm, ae_tag,
					    ae_id, ae_name);

		s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry);
		if (s == -1) {
			archive_set_error(&a->archive, errno,
			    "Failed to get next ACL entry");
			return (ARCHIVE_WARN);
		}
	}
	return (ARCHIVE_OK);
}

static int
set_acl(struct archive *a, int fd, const char *name,
    struct archive_acl *abstract_acl, __LA_MODE_T mode,
    int ae_requested_type, const char *tname)
{
	int		 acl_type = 0;
	acl_t		 acl;
	acl_entry_t	 acl_entry;
	acl_permset_t	 acl_permset;
#if ARCHIVE_ACL_FREEBSD_NFS4
	acl_flagset_t	 acl_flagset;
	int		 r;
#endif
	int		 ret;
	int		 ae_type, ae_permset, ae_tag, ae_id;
	int		 perm_map_size;
	const acl_perm_map_t	*perm_map;
	uid_t		 ae_uid;
	gid_t		 ae_gid;
	const char	*ae_name;
	int		 entries;
	int		 i;

	ret = ARCHIVE_OK;
	entries = archive_acl_reset(abstract_acl, ae_requested_type);
	if (entries == 0)
		return (ARCHIVE_OK);


	switch (ae_requested_type) {
	case ARCHIVE_ENTRY_ACL_TYPE_ACCESS:
		acl_type = ACL_TYPE_ACCESS;
		break;
	case ARCHIVE_ENTRY_ACL_TYPE_DEFAULT:
		acl_type = ACL_TYPE_DEFAULT;
		break;
#if ARCHIVE_ACL_FREEBSD_NFS4
	case ARCHIVE_ENTRY_ACL_TYPE_NFS4:
		acl_type = ACL_TYPE_NFS4;
		break;
#endif
	default:
		errno = ENOENT;
		archive_set_error(a, errno, "Unsupported ACL type");
		return (ARCHIVE_FAILED);
	}

	if (acl_type == ACL_TYPE_DEFAULT && !S_ISDIR(mode)) {
		errno = EINVAL;
		archive_set_error(a, errno,
		    "Cannot set default ACL on non-directory");
		return (ARCHIVE_WARN);
	}

	acl = acl_init(entries);
	if (acl == (acl_t)NULL) {
		archive_set_error(a, errno,
		    "Failed to initialize ACL working storage");
		return (ARCHIVE_FAILED);
	}

	while (archive_acl_next(a, abstract_acl, ae_requested_type, &ae_type,
		   &ae_permset, &ae_tag, &ae_id, &ae_name) == ARCHIVE_OK) {
		if (acl_create_entry(&acl, &acl_entry) != 0) {
			archive_set_error(a, errno,
			    "Failed to create a new ACL entry");
			ret = ARCHIVE_FAILED;
			goto exit_free;
		}
		switch (ae_tag) {
		case ARCHIVE_ENTRY_ACL_USER:
			ae_uid = archive_write_disk_uid(a, ae_name, ae_id);
			acl_set_tag_type(acl_entry, ACL_USER);
			acl_set_qualifier(acl_entry, &ae_uid);
			break;
		case ARCHIVE_ENTRY_ACL_GROUP:
			ae_gid = archive_write_disk_gid(a, ae_name, ae_id);
			acl_set_tag_type(acl_entry, ACL_GROUP);
			acl_set_qualifier(acl_entry, &ae_gid);
			break;
		case ARCHIVE_ENTRY_ACL_USER_OBJ:
			acl_set_tag_type(acl_entry, ACL_USER_OBJ);
			break;
		case ARCHIVE_ENTRY_ACL_GROUP_OBJ:
			acl_set_tag_type(acl_entry, ACL_GROUP_OBJ);
			break;
		case ARCHIVE_ENTRY_ACL_MASK:
			acl_set_tag_type(acl_entry, ACL_MASK);
			break;
		case ARCHIVE_ENTRY_ACL_OTHER:
			acl_set_tag_type(acl_entry, ACL_OTHER);
			break;
#if ARCHIVE_ACL_FREEBSD_NFS4
		case ARCHIVE_ENTRY_ACL_EVERYONE:
			acl_set_tag_type(acl_entry, ACL_EVERYONE);
			break;
#endif
		default:
			archive_set_error(a, ARCHIVE_ERRNO_MISC,
			    "Unsupported ACL tag");
			ret = ARCHIVE_FAILED;
			goto exit_free;
		}

#if ARCHIVE_ACL_FREEBSD_NFS4
		r = 0;
		switch (ae_type) {
		case ARCHIVE_ENTRY_ACL_TYPE_ALLOW:
			r = acl_set_entry_type_np(acl_entry,
			    ACL_ENTRY_TYPE_ALLOW);
			break;
		case ARCHIVE_ENTRY_ACL_TYPE_DENY:
			r = acl_set_entry_type_np(acl_entry,
			    ACL_ENTRY_TYPE_DENY);
			break;
		case ARCHIVE_ENTRY_ACL_TYPE_AUDIT:
			r = acl_set_entry_type_np(acl_entry,
			    ACL_ENTRY_TYPE_AUDIT);
			break;
		case ARCHIVE_ENTRY_ACL_TYPE_ALARM:
			r = acl_set_entry_type_np(acl_entry,
			    ACL_ENTRY_TYPE_ALARM);
			break;
		case ARCHIVE_ENTRY_ACL_TYPE_ACCESS:
		case ARCHIVE_ENTRY_ACL_TYPE_DEFAULT:
			// These don't translate directly into the system ACL.
			break;
		default:
			archive_set_error(a, ARCHIVE_ERRNO_MISC,
			    "Unsupported ACL entry type");
			ret = ARCHIVE_FAILED;
			goto exit_free;
		}

		if (r != 0) {
			archive_set_error(a, errno,
			    "Failed to set ACL entry type");
			ret = ARCHIVE_FAILED;
			goto exit_free;
		}
#endif

		if (acl_get_permset(acl_entry, &acl_permset) != 0) {
			archive_set_error(a, errno,
			    "Failed to get ACL permission set");
			ret = ARCHIVE_FAILED;
			goto exit_free;
		}
		if (acl_clear_perms(acl_permset) != 0) {
			archive_set_error(a, errno,
			    "Failed to clear ACL permissions");
			ret = ARCHIVE_FAILED;
			goto exit_free;
		}
#if ARCHIVE_ACL_FREEBSD_NFS4
		if (ae_requested_type == ARCHIVE_ENTRY_ACL_TYPE_NFS4) {
			perm_map_size = acl_nfs4_perm_map_size;
			perm_map = acl_nfs4_perm_map;
		} else {
#endif
			perm_map_size = acl_posix_perm_map_size;
			perm_map = acl_posix_perm_map;
#if ARCHIVE_ACL_FREEBSD_NFS4
		}
#endif

		for (i = 0; i < perm_map_size; ++i) {
			if (ae_permset & perm_map[i].a_perm) {
				if (acl_add_perm(acl_permset,
				    perm_map[i].p_perm) != 0) {
					archive_set_error(a, errno,
					    "Failed to add ACL permission");
					ret = ARCHIVE_FAILED;
					goto exit_free;
				}
			}
		}

#if ARCHIVE_ACL_FREEBSD_NFS4
		if (ae_requested_type == ARCHIVE_ENTRY_ACL_TYPE_NFS4) {
			/*
			 * acl_get_flagset_np() fails with non-NFSv4 ACLs
			 */
			if (acl_get_flagset_np(acl_entry, &acl_flagset) != 0) {
				archive_set_error(a, errno,
				    "Failed to get flagset from an NFSv4 "
				    "ACL entry");
				ret = ARCHIVE_FAILED;
				goto exit_free;
			}
			if (acl_clear_flags_np(acl_flagset) != 0) {
				archive_set_error(a, errno,
				    "Failed to clear flags from an NFSv4 "
				    "ACL flagset");
				ret = ARCHIVE_FAILED;
				goto exit_free;
			}
			for (i = 0; i < acl_nfs4_flag_map_size; ++i) {
				if (ae_permset & acl_nfs4_flag_map[i].a_perm) {
					if (acl_add_flag_np(acl_flagset,
					    acl_nfs4_flag_map[i].p_perm) != 0) {
						archive_set_error(a, errno,
						    "Failed to add flag to "
						    "NFSv4 ACL flagset");
						ret = ARCHIVE_FAILED;
						goto exit_free;
					}
				}
			}
		}
#endif
	}

	/* Try restoring the ACL through 'fd' if we can. */
	if (fd >= 0) {
		if (acl_set_fd_np(fd, acl, acl_type) == 0)
			ret = ARCHIVE_OK;
		else {
			if (errno == EOPNOTSUPP) {
				/* Filesystem doesn't support ACLs */
				ret = ARCHIVE_OK;
			} else {
				archive_set_error(a, errno,
				    "Failed to set acl on fd: %s", tname);
				ret = ARCHIVE_WARN;
			}
		}
	}
#if HAVE_ACL_SET_LINK_NP
	else if (acl_set_link_np(name, acl_type, acl) != 0)
#else
	/* FreeBSD older than 8.0 */
	else if (S_ISLNK(mode)) {
	    /* acl_set_file() follows symbolic links, skip */
	    ret = ARCHIVE_OK;
	} else if (acl_set_file(name, acl_type, acl) != 0)
#endif
	{
		if (errno == EOPNOTSUPP) {
			/* Filesystem doesn't support ACLs */
			ret = ARCHIVE_OK;
		} else {
			archive_set_error(a, errno, "Failed to set acl: %s",
			    tname);
			ret = ARCHIVE_WARN;
		}
	}
exit_free:
	acl_free(acl);
	return (ret);
}

int
archive_read_disk_entry_setup_acls(struct archive_read_disk *a,
    struct archive_entry *entry, int *fd)
{
	const char	*accpath;
	acl_t		acl;
	int		r;

	accpath = NULL;

	if (*fd < 0) {
		accpath = archive_read_disk_entry_setup_path(a, entry, fd);
		if (accpath == NULL)
			return (ARCHIVE_WARN);
	}

	archive_entry_acl_clear(entry);

	acl = NULL;

#if ARCHIVE_ACL_FREEBSD_NFS4
	/* Try NFSv4 ACL first. */
	if (*fd >= 0)
		acl = acl_get_fd_np(*fd, ACL_TYPE_NFS4);
	else if (!a->follow_symlinks)
		acl = acl_get_link_np(accpath, ACL_TYPE_NFS4);
	else
		acl = acl_get_file(accpath, ACL_TYPE_NFS4);

	/* Ignore "trivial" ACLs that just mirror the file mode. */
	if (acl != NULL && acl_is_trivial_np(acl, &r) == 0 && r == 1) {
		acl_free(acl);
		acl = NULL;
		return (ARCHIVE_OK);
	}

	if (acl != NULL) {
		r = translate_acl(a, entry, acl, ARCHIVE_ENTRY_ACL_TYPE_NFS4);
		acl_free(acl);
		acl = NULL;

		if (r != ARCHIVE_OK) {
			archive_set_error(&a->archive, errno,
			    "Couldn't translate NFSv4 ACLs");
		}

		return (r);
	}
#endif

	/* Retrieve access ACL from file. */
	if (*fd >= 0)
		acl = acl_get_fd_np(*fd, ACL_TYPE_ACCESS);
#if HAVE_ACL_GET_LINK_NP
	else if (!a->follow_symlinks)
		acl = acl_get_link_np(accpath, ACL_TYPE_ACCESS);
#else
	else if ((!a->follow_symlinks)
	    && (archive_entry_filetype(entry) == AE_IFLNK))
		/* We can't get the ACL of a symlink, so we assume it can't
		   have one. */
		acl = NULL;
#endif
	else
		acl = acl_get_file(accpath, ACL_TYPE_ACCESS);

#if HAVE_ACL_IS_TRIVIAL_NP
	/* Ignore "trivial" ACLs that just mirror the file mode. */
	if (acl != NULL && acl_is_trivial_np(acl, &r) == 0 && r == 1) {
		acl_free(acl);
		acl = NULL;
	}
#endif

	if (acl != NULL) {
		r = translate_acl(a, entry, acl, ARCHIVE_ENTRY_ACL_TYPE_ACCESS);
		acl_free(acl);
		acl = NULL;

		if (r != ARCHIVE_OK) {
			archive_set_error(&a->archive, errno,
			    "Couldn't translate access ACLs");
			return (r);
		}
	}

	/* Only directories can have default ACLs. */
	if (S_ISDIR(archive_entry_mode(entry))) {
		if (*fd >= 0)
			acl = acl_get_fd_np(*fd, ACL_TYPE_DEFAULT);
		else
			acl = acl_get_file(accpath, ACL_TYPE_DEFAULT);
		if (acl != NULL) {
			r = translate_acl(a, entry, acl,
			    ARCHIVE_ENTRY_ACL_TYPE_DEFAULT);
			acl_free(acl);
			if (r != ARCHIVE_OK) {
				archive_set_error(&a->archive, errno,
				    "Couldn't translate default ACLs");
				return (r);
			}
		}
	}
	return (ARCHIVE_OK);
}

int
archive_write_disk_set_acls(struct archive *a, int fd, const char *name,
    struct archive_acl *abstract_acl, __LA_MODE_T mode)
{
	int		ret = ARCHIVE_OK;

	(void)mode;	/* UNUSED */

	if ((archive_acl_types(abstract_acl)
	    & ARCHIVE_ENTRY_ACL_TYPE_POSIX1E) != 0) {
		if ((archive_acl_types(abstract_acl)
		    & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) {
			ret = set_acl(a, fd, name, abstract_acl, mode,
			    ARCHIVE_ENTRY_ACL_TYPE_ACCESS, "access");
			if (ret != ARCHIVE_OK)
				return (ret);
		}
		if ((archive_acl_types(abstract_acl)
		    & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) != 0)
			ret = set_acl(a, fd, name, abstract_acl, mode,
			    ARCHIVE_ENTRY_ACL_TYPE_DEFAULT, "default");

		/* Simultaneous POSIX.1e and NFSv4 is not supported */
		return (ret);
	}
#if ARCHIVE_ACL_FREEBSD_NFS4
	else if ((archive_acl_types(abstract_acl) &
	    ARCHIVE_ENTRY_ACL_TYPE_NFS4) != 0) {
		ret = set_acl(a, fd, name, abstract_acl, mode,
		    ARCHIVE_ENTRY_ACL_TYPE_NFS4, "nfs4");
	}
#endif
	return (ret);
}
#endif	/* ARCHIVE_ACL_FREEBSD */