common/zfs/zfs_deleg.c

	zfs_deleg.c revision ecd6cf800b63704be73fb264c3f5b6e0dafc068d
/*
 * 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
#include <sys/dsl_deleg.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_QUOTA,
    ZFS_DELEG_PERM_RESERVATION,
    ZFS_DELEG_PERM_VOLSIZE,
    ZFS_DELEG_PERM_RECORDSIZE,
    ZFS_DELEG_PERM_MOUNTPOINT,
    ZFS_DELEG_PERM_SHARENFS,
    ZFS_DELEG_PERM_CHECKSUM,
    ZFS_DELEG_PERM_COMPRESSION,
    ZFS_DELEG_PERM_ATIME,
    ZFS_DELEG_PERM_DEVICES,
    ZFS_DELEG_PERM_EXEC,
    ZFS_DELEG_PERM_SETUID,
    ZFS_DELEG_PERM_READONLY,
    ZFS_DELEG_PERM_ZONED,
    ZFS_DELEG_PERM_SNAPDIR,
    ZFS_DELEG_PERM_ACLMODE,
    ZFS_DELEG_PERM_ACLINHERIT,
    ZFS_DELEG_PERM_ALLOW,
    ZFS_DELEG_PERM_CANMOUNT,
    ZFS_DELEG_PERM_USERPROP,
    ZFS_DELEG_PERM_SHAREISCSI,
    ZFS_DELEG_PERM_XATTR,
    ZFS_DELEG_PERM_COPIES,
    NULL
};

int
zfs_deleg_type(char *name)
{
    return (name[0]);
}

static int
zfs_valid_permission_name(char *perm)
{
    int i;
    for (i = 0; zfs_deleg_perm_tab[i] != NULL; i++) {
        if (strcmp(perm, zfs_deleg_perm_tab[i]) == 0)
            return (0);
    }

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

static int
zfs_validate_who(char *who)
{
    int error = 0;
    char *p;

    switch (zfs_deleg_type(who)) {
    case ZFS_DELEG_USER:
    case ZFS_DELEG_GROUP:
    case ZFS_DELEG_USER_SETS:
    case ZFS_DELEG_GROUP_SETS:
        if ((who[1] != 'l' || who[1] != 'd') &&
            (who[2] != ZFS_DELEG_FIELD_SEP_CHR)) {
            error = -1;
            break;
        }

        for (p = &who[3]; p && *p; p++)
            if (!isdigit(*p)) {
                error = -1;
            }
        break;
    case ZFS_DELEG_NAMED_SET:
    case ZFS_DELEG_NAMED_SET_SETS:
        error =  permset_namecheck(&who[3], NULL, NULL);
        break;

    case ZFS_DELEG_CREATE:
    case ZFS_DELEG_CREATE_SETS:
    case ZFS_DELEG_EVERYONE:
    case ZFS_DELEG_EVERYONE_SETS:
        if (who[3] != '\0')
            error = -1;
        break;
    default:
        error = -1;
    }

    return (error);
}

static int
zfs_validate_iflags(char *who)
{
    switch (zfs_deleg_type(who)) {
    case ZFS_DELEG_NAMED_SET:
    case ZFS_DELEG_NAMED_SET_SETS:
    case ZFS_DELEG_CREATE:
    case ZFS_DELEG_CREATE_SETS:
        if (who[1] != '-')
            return (-1);
        break;
    default:
        if (who[1] != 'l' && who[1] != 'd')
            return (-1);
        break;
    }
    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);

        if (zfs_validate_iflags(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, char 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;
    default:
        (void) snprintf(attr, len, "%c%c%c", type, inheritchr,
            ZFS_DELEG_FIELD_SEP_CHR);
    }
}