common/zfs/zfs_deleg.c

	zfs_deleg.c revision 91ebeef555ce7f899b6270a3c2df47b51f7ad59a
/*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */


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

#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
 */

char *zfs_deleg_perm_tab[] = {
    ZFS_DELEG_PERM_CREATE,
    ZFS_DELEG_PERM_DESTROY,
    ZFS_DELEG_PERM_SNAPSHOT,
    ZFS_DELEG_PERM_ROLLBACK,
    ZFS_DELEG_PERM_CLONE,
    ZFS_DELEG_PERM_PROMOTE,
    ZFS_DELEG_PERM_RENAME,
    ZFS_DELEG_PERM_MOUNT,
    ZFS_DELEG_PERM_SHARE,
    ZFS_DELEG_PERM_SEND,
    ZFS_DELEG_PERM_RECEIVE,
    ZFS_DELEG_PERM_ALLOW,
    ZFS_DELEG_PERM_USERPROP,
    NULL
};

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] != NULL; i++) {
        if (strcmp(perm, zfs_deleg_perm_tab[i]) == 0)
            return (perm);
    }

    prop = zfs_name_to_prop(perm);
    if (prop != ZFS_PROP_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");
    }
}