/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (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 (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.

 * Copyright 2010 Nexenta Systems, Inc. All rights reserved.

 */

#if defined(_KERNEL)

#include <sys/systm.h>

#include <sys/sunddi.h>

#include <sys/ctype.h>

#else

#include <stdio.h>

#include <unistd.h>

#include <strings.h>

#include <libnvpair.h>

#include <ctype.h>

#endif

/* XXX includes zfs_context.h, so why bother with the above? */

#include <sys/dsl_deleg.h>

#include "zfs_prop.h"

#include "zfs_deleg.h"

#include "zfs_namecheck.h"

/*

 * permission table

 *

 * Keep this table in sorted order

 *

 * This table is used for displaying all permissions for

 * zfs allow

 */

zfs_deleg_perm_tab_t zfs_deleg_perm_tab[] = {

	{ZFS_DELEG_PERM_ALLOW, ZFS_DELEG_NOTE_ALLOW},

	{ZFS_DELEG_PERM_CLONE, ZFS_DELEG_NOTE_CLONE },

	{ZFS_DELEG_PERM_CREATE, ZFS_DELEG_NOTE_CREATE },

	{ZFS_DELEG_PERM_DESTROY, ZFS_DELEG_NOTE_DESTROY },

	{ZFS_DELEG_PERM_MOUNT, ZFS_DELEG_NOTE_MOUNT },

	{ZFS_DELEG_PERM_PROMOTE, ZFS_DELEG_NOTE_PROMOTE },

	{ZFS_DELEG_PERM_RECEIVE, ZFS_DELEG_NOTE_RECEIVE },

	{ZFS_DELEG_PERM_RENAME, ZFS_DELEG_NOTE_RENAME },

	{ZFS_DELEG_PERM_ROLLBACK, ZFS_DELEG_NOTE_ROLLBACK },

	{ZFS_DELEG_PERM_SNAPSHOT, ZFS_DELEG_NOTE_SNAPSHOT },

	{ZFS_DELEG_PERM_SHARE, ZFS_DELEG_NOTE_SHARE },

	{ZFS_DELEG_PERM_SEND, ZFS_DELEG_NOTE_SEND },

	{ZFS_DELEG_PERM_USERPROP, ZFS_DELEG_NOTE_USERPROP },

	{ZFS_DELEG_PERM_USERQUOTA, ZFS_DELEG_NOTE_USERQUOTA },

	{ZFS_DELEG_PERM_GROUPQUOTA, ZFS_DELEG_NOTE_GROUPQUOTA },

	{ZFS_DELEG_PERM_USERUSED, ZFS_DELEG_NOTE_USERUSED },

	{ZFS_DELEG_PERM_GROUPUSED, ZFS_DELEG_NOTE_GROUPUSED },

	{ZFS_DELEG_PERM_HOLD, ZFS_DELEG_NOTE_HOLD },

	{ZFS_DELEG_PERM_RELEASE, ZFS_DELEG_NOTE_RELEASE },

	{ZFS_DELEG_PERM_DIFF, ZFS_DELEG_NOTE_DIFF},

	{NULL, ZFS_DELEG_NOTE_NONE }

};

static int

zfs_valid_permission_name(const char *perm)

{

	if (zfs_deleg_canonicalize_perm(perm))

		return (0);

	return (permset_namecheck(perm, NULL, NULL));

}

const char *

zfs_deleg_canonicalize_perm(const char *perm)

{

	int i;

	zfs_prop_t prop;

	for (i = 0; zfs_deleg_perm_tab[i].z_perm != NULL; i++) {

		if (strcmp(perm, zfs_deleg_perm_tab[i].z_perm) == 0)

			return (perm);

	}

	prop = zfs_name_to_prop(perm);

	if (prop != ZPROP_INVAL && zfs_prop_delegatable(prop))

		return (zfs_prop_to_name(prop));

	return (NULL);

}

static int

zfs_validate_who(char *who)

{

	char *p;

	if (who[2] != ZFS_DELEG_FIELD_SEP_CHR)

		return (-1);

	switch (who[0]) {

	case ZFS_DELEG_USER:

	case ZFS_DELEG_GROUP:

	case ZFS_DELEG_USER_SETS:

	case ZFS_DELEG_GROUP_SETS:

		if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)

			return (-1);

		for (p = &who[3]; *p; p++)

			if (!isdigit(*p))

				return (-1);

		break;

	case ZFS_DELEG_NAMED_SET:

	case ZFS_DELEG_NAMED_SET_SETS:

		if (who[1] != ZFS_DELEG_NA)

			return (-1);

		return (permset_namecheck(&who[3], NULL, NULL));

	case ZFS_DELEG_CREATE:

	case ZFS_DELEG_CREATE_SETS:

		if (who[1] != ZFS_DELEG_NA)

			return (-1);

		if (who[3] != '\0')

			return (-1);

		break;

	case ZFS_DELEG_EVERYONE:

	case ZFS_DELEG_EVERYONE_SETS:

		if (who[1] != ZFS_DELEG_LOCAL && who[1] != ZFS_DELEG_DESCENDENT)

			return (-1);

		if (who[3] != '\0')

			return (-1);

		break;

	default:

		return (-1);

	}

	return (0);

}

int

zfs_deleg_verify_nvlist(nvlist_t *nvp)

{

	nvpair_t *who, *perm_name;

	nvlist_t *perms;

	int error;

	if (nvp == NULL)

		return (-1);

	who = nvlist_next_nvpair(nvp, NULL);

	if (who == NULL)

		return (-1);

	do {

		if (zfs_validate_who(nvpair_name(who)))

			return (-1);

		error = nvlist_lookup_nvlist(nvp, nvpair_name(who), &perms);

		if (error && error != ENOENT)

			return (-1);

		if (error == ENOENT)

			continue;

		perm_name = nvlist_next_nvpair(perms, NULL);

		if (perm_name == NULL) {

			return (-1);

		}

		do {

			error = zfs_valid_permission_name(

			    nvpair_name(perm_name));

			if (error)

				return (-1);

		} while (perm_name = nvlist_next_nvpair(perms, perm_name));

	} while (who = nvlist_next_nvpair(nvp, who));

	return (0);

}

/*

 * Construct the base attribute name.  The base attribute names

 * are the "key" to locate the jump objects which contain the actual

 * permissions.  The base attribute names are encoded based on

 * type of entry and whether it is a local or descendent permission.

 *

 * Arguments:

 * attr - attribute name return string, attribute is assumed to be

 *        ZFS_MAX_DELEG_NAME long.

 * type - type of entry to construct

 * inheritchr - inheritance type (local,descendent, or NA for create and

 *                               permission set definitions

 * data - is either a permission set name or a 64 bit uid/gid.

 */

void

zfs_deleg_whokey(char *attr, zfs_deleg_who_type_t type,

    char inheritchr, void *data)

{

	int len = ZFS_MAX_DELEG_NAME;

	uint64_t *id = data;

	switch (type) {

	case ZFS_DELEG_USER:

	case ZFS_DELEG_GROUP:

	case ZFS_DELEG_USER_SETS:

	case ZFS_DELEG_GROUP_SETS:

		(void) snprintf(attr, len, "%c%c%c%lld", type, inheritchr,

		    ZFS_DELEG_FIELD_SEP_CHR, (longlong_t)*id);

		break;

	case ZFS_DELEG_NAMED_SET_SETS:

	case ZFS_DELEG_NAMED_SET:

		(void) snprintf(attr, len, "%c-%c%s", type,

		    ZFS_DELEG_FIELD_SEP_CHR, (char *)data);

		break;

	case ZFS_DELEG_CREATE:

	case ZFS_DELEG_CREATE_SETS:

		(void) snprintf(attr, len, "%c-%c", type,

		    ZFS_DELEG_FIELD_SEP_CHR);

		break;

	case ZFS_DELEG_EVERYONE:

	case ZFS_DELEG_EVERYONE_SETS:

		(void) snprintf(attr, len, "%c%c%c", type, inheritchr,

		    ZFS_DELEG_FIELD_SEP_CHR);

		break;

	default:

		ASSERT(!"bad zfs_deleg_who_type_t");

	}

}