528 lines
14 KiB
C
528 lines
14 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/dirent.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/rwlock.h>
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#include <sys/refcount.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <netinet/in.h>
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#include <net/radix.h>
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static MALLOC_DEFINE(M_NETADDR, "export_host", "Export host address structure");
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#if defined(INET) || defined(INET6)
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static struct radix_node_head *vfs_create_addrlist_af(
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struct radix_node_head **prnh, int off);
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#endif
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static void vfs_free_addrlist(struct netexport *nep);
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static int vfs_free_netcred(struct radix_node *rn, void *w);
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static void vfs_free_addrlist_af(struct radix_node_head **prnh);
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static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
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struct export_args *argp);
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static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *);
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/*
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* Network address lookup element
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*/
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struct netcred {
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struct radix_node netc_rnodes[2];
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int netc_exflags;
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struct ucred *netc_anon;
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int netc_numsecflavors;
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int netc_secflavors[MAXSECFLAVORS];
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};
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/*
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* Network export information
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*/
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struct netexport {
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struct netcred ne_defexported; /* Default export */
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struct radix_node_head *ne4;
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struct radix_node_head *ne6;
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};
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/*
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* Build hash lists of net addresses and hang them off the mount point.
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* Called by vfs_export() to set up the lists of export addresses.
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*/
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static int
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vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
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struct export_args *argp)
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{
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struct netcred *np;
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struct radix_node_head *rnh;
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int i;
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struct radix_node *rn;
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struct sockaddr *saddr, *smask = NULL;
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#if defined(INET6) || defined(INET)
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int off;
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#endif
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int error;
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/*
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* XXX: This routine converts from a `struct xucred'
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* (argp->ex_anon) to a `struct ucred' (np->netc_anon). This
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* operation is questionable; for example, what should be done
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* with fields like cr_uidinfo and cr_prison? Currently, this
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* routine does not touch them (leaves them as NULL).
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*/
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if (argp->ex_anon.cr_version != XUCRED_VERSION) {
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vfs_mount_error(mp, "ex_anon.cr_version: %d != %d",
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argp->ex_anon.cr_version, XUCRED_VERSION);
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return (EINVAL);
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}
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if (argp->ex_addrlen == 0) {
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if (mp->mnt_flag & MNT_DEFEXPORTED) {
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vfs_mount_error(mp,
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"MNT_DEFEXPORTED already set for mount %p", mp);
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return (EPERM);
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}
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np = &nep->ne_defexported;
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np->netc_exflags = argp->ex_flags;
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np->netc_anon = crget();
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np->netc_anon->cr_uid = argp->ex_anon.cr_uid;
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crsetgroups(np->netc_anon, argp->ex_anon.cr_ngroups,
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argp->ex_anon.cr_groups);
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np->netc_anon->cr_prison = &prison0;
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prison_hold(np->netc_anon->cr_prison);
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np->netc_numsecflavors = argp->ex_numsecflavors;
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bcopy(argp->ex_secflavors, np->netc_secflavors,
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sizeof(np->netc_secflavors));
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MNT_ILOCK(mp);
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mp->mnt_flag |= MNT_DEFEXPORTED;
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MNT_IUNLOCK(mp);
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return (0);
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}
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#if MSIZE <= 256
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if (argp->ex_addrlen > MLEN) {
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vfs_mount_error(mp, "ex_addrlen %d is greater than %d",
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argp->ex_addrlen, MLEN);
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return (EINVAL);
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}
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#endif
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i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
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np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
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saddr = (struct sockaddr *) (np + 1);
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if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
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goto out;
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if (saddr->sa_family == AF_UNSPEC || saddr->sa_family > AF_MAX) {
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error = EINVAL;
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vfs_mount_error(mp, "Invalid saddr->sa_family: %d");
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goto out;
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}
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if (saddr->sa_len > argp->ex_addrlen)
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saddr->sa_len = argp->ex_addrlen;
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if (argp->ex_masklen) {
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smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
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error = copyin(argp->ex_mask, smask, argp->ex_masklen);
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if (error)
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goto out;
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if (smask->sa_len > argp->ex_masklen)
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smask->sa_len = argp->ex_masklen;
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}
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rnh = NULL;
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switch (saddr->sa_family) {
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#ifdef INET
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case AF_INET:
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if ((rnh = nep->ne4) == NULL) {
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off = offsetof(struct sockaddr_in, sin_addr) << 3;
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rnh = vfs_create_addrlist_af(&nep->ne4, off);
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}
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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if ((rnh = nep->ne6) == NULL) {
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off = offsetof(struct sockaddr_in6, sin6_addr) << 3;
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rnh = vfs_create_addrlist_af(&nep->ne6, off);
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}
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break;
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#endif
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}
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if (rnh == NULL) {
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error = ENOBUFS;
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vfs_mount_error(mp, "%s %s %d",
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"Unable to initialize radix node head ",
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"for address family", saddr->sa_family);
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goto out;
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}
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RADIX_NODE_HEAD_LOCK(rnh);
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rn = (*rnh->rnh_addaddr)(saddr, smask, &rnh->rh, np->netc_rnodes);
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RADIX_NODE_HEAD_UNLOCK(rnh);
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if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
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error = EPERM;
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vfs_mount_error(mp,
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"netcred already exists for given addr/mask");
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goto out;
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}
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np->netc_exflags = argp->ex_flags;
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np->netc_anon = crget();
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np->netc_anon->cr_uid = argp->ex_anon.cr_uid;
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crsetgroups(np->netc_anon, argp->ex_anon.cr_ngroups,
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argp->ex_anon.cr_groups);
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np->netc_anon->cr_prison = &prison0;
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prison_hold(np->netc_anon->cr_prison);
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np->netc_numsecflavors = argp->ex_numsecflavors;
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bcopy(argp->ex_secflavors, np->netc_secflavors,
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sizeof(np->netc_secflavors));
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return (0);
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out:
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free(np, M_NETADDR);
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return (error);
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}
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/* Helper for vfs_free_addrlist. */
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/* ARGSUSED */
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static int
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vfs_free_netcred(struct radix_node *rn, void *w)
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{
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struct radix_node_head *rnh = (struct radix_node_head *) w;
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struct ucred *cred;
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(*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, &rnh->rh);
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cred = ((struct netcred *)rn)->netc_anon;
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if (cred != NULL)
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crfree(cred);
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free(rn, M_NETADDR);
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return (0);
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}
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#if defined(INET) || defined(INET6)
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static struct radix_node_head *
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vfs_create_addrlist_af(struct radix_node_head **prnh, int off)
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{
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if (rn_inithead((void **)prnh, off) == 0)
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return (NULL);
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RADIX_NODE_HEAD_LOCK_INIT(*prnh);
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return (*prnh);
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}
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#endif
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static void
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vfs_free_addrlist_af(struct radix_node_head **prnh)
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{
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struct radix_node_head *rnh;
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rnh = *prnh;
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RADIX_NODE_HEAD_LOCK(rnh);
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(*rnh->rnh_walktree)(&rnh->rh, vfs_free_netcred, rnh);
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RADIX_NODE_HEAD_UNLOCK(rnh);
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RADIX_NODE_HEAD_DESTROY(rnh);
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rn_detachhead((void **)prnh);
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prnh = NULL;
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}
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/*
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* Free the net address hash lists that are hanging off the mount points.
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*/
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static void
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vfs_free_addrlist(struct netexport *nep)
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{
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struct ucred *cred;
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if (nep->ne4 != NULL)
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vfs_free_addrlist_af(&nep->ne4);
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if (nep->ne6 != NULL)
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vfs_free_addrlist_af(&nep->ne6);
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cred = nep->ne_defexported.netc_anon;
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if (cred != NULL)
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crfree(cred);
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}
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/*
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* High level function to manipulate export options on a mount point
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* and the passed in netexport.
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* Struct export_args *argp is the variable used to twiddle options,
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* the structure is described in sys/mount.h
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*/
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int
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vfs_export(struct mount *mp, struct export_args *argp)
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{
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struct netexport *nep;
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int error;
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if (argp->ex_numsecflavors < 0
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|| argp->ex_numsecflavors >= MAXSECFLAVORS)
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return (EINVAL);
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error = 0;
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lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL);
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nep = mp->mnt_export;
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if (argp->ex_flags & MNT_DELEXPORT) {
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if (nep == NULL) {
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error = ENOENT;
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goto out;
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}
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if (mp->mnt_flag & MNT_EXPUBLIC) {
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vfs_setpublicfs(NULL, NULL, NULL);
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MNT_ILOCK(mp);
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mp->mnt_flag &= ~MNT_EXPUBLIC;
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MNT_IUNLOCK(mp);
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}
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vfs_free_addrlist(nep);
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mp->mnt_export = NULL;
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free(nep, M_MOUNT);
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nep = NULL;
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MNT_ILOCK(mp);
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mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
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MNT_IUNLOCK(mp);
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}
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if (argp->ex_flags & MNT_EXPORTED) {
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if (nep == NULL) {
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nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
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mp->mnt_export = nep;
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}
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if (argp->ex_flags & MNT_EXPUBLIC) {
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if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
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goto out;
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MNT_ILOCK(mp);
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mp->mnt_flag |= MNT_EXPUBLIC;
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MNT_IUNLOCK(mp);
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}
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if ((error = vfs_hang_addrlist(mp, nep, argp)))
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goto out;
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MNT_ILOCK(mp);
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mp->mnt_flag |= MNT_EXPORTED;
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MNT_IUNLOCK(mp);
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}
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out:
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lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
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/*
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* Once we have executed the vfs_export() command, we do
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* not want to keep the "export" option around in the
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* options list, since that will cause subsequent MNT_UPDATE
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* calls to fail. The export information is saved in
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* mp->mnt_export, so we can safely delete the "export" mount option
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* here.
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*/
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vfs_deleteopt(mp->mnt_optnew, "export");
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vfs_deleteopt(mp->mnt_opt, "export");
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return (error);
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}
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/*
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* Set the publicly exported filesystem (WebNFS). Currently, only
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* one public filesystem is possible in the spec (RFC 2054 and 2055)
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*/
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int
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vfs_setpublicfs(struct mount *mp, struct netexport *nep,
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struct export_args *argp)
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{
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int error;
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struct vnode *rvp;
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char *cp;
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/*
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* mp == NULL -> invalidate the current info, the FS is
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* no longer exported. May be called from either vfs_export
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* or unmount, so check if it hasn't already been done.
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*/
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if (mp == NULL) {
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if (nfs_pub.np_valid) {
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nfs_pub.np_valid = 0;
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if (nfs_pub.np_index != NULL) {
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free(nfs_pub.np_index, M_TEMP);
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nfs_pub.np_index = NULL;
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}
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}
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return (0);
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}
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/*
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* Only one allowed at a time.
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*/
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if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
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return (EBUSY);
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/*
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* Get real filehandle for root of exported FS.
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*/
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bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
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nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
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if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp)))
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return (error);
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if ((error = VOP_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
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return (error);
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vput(rvp);
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/*
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* If an indexfile was specified, pull it in.
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*/
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if (argp->ex_indexfile != NULL) {
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if (nfs_pub.np_index == NULL)
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nfs_pub.np_index = malloc(MAXNAMLEN + 1, M_TEMP,
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M_WAITOK);
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error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
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MAXNAMLEN, (size_t *)0);
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if (!error) {
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/*
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* Check for illegal filenames.
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*/
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for (cp = nfs_pub.np_index; *cp; cp++) {
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if (*cp == '/') {
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error = EINVAL;
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break;
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}
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}
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}
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if (error) {
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free(nfs_pub.np_index, M_TEMP);
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nfs_pub.np_index = NULL;
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return (error);
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}
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}
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nfs_pub.np_mount = mp;
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nfs_pub.np_valid = 1;
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return (0);
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}
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/*
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* Used by the filesystems to determine if a given network address
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* (passed in 'nam') is present in their exports list, returns a pointer
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* to struct netcred so that the filesystem can examine it for
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* access rights (read/write/etc).
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*/
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static struct netcred *
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vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
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{
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struct netexport *nep;
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struct netcred *np = NULL;
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struct radix_node_head *rnh;
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struct sockaddr *saddr;
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nep = mp->mnt_export;
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if (nep == NULL)
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return (NULL);
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if ((mp->mnt_flag & MNT_EXPORTED) == 0)
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return (NULL);
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/*
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* Lookup in the export list
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*/
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if (nam != NULL) {
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saddr = nam;
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rnh = NULL;
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switch (saddr->sa_family) {
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case AF_INET:
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rnh = nep->ne4;
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break;
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case AF_INET6:
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rnh = nep->ne6;
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break;
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}
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if (rnh != NULL) {
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RADIX_NODE_HEAD_RLOCK(rnh);
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np = (struct netcred *) (*rnh->rnh_matchaddr)(saddr, &rnh->rh);
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RADIX_NODE_HEAD_RUNLOCK(rnh);
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if (np != NULL && (np->netc_rnodes->rn_flags & RNF_ROOT) != 0)
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return (NULL);
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}
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}
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/*
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|
* If no address match, use the default if it exists.
|
|
*/
|
|
if (np == NULL && (mp->mnt_flag & MNT_DEFEXPORTED) != 0)
|
|
return (&nep->ne_defexported);
|
|
|
|
return (np);
|
|
}
|
|
|
|
/*
|
|
* XXX: This comment comes from the deprecated ufs_check_export()
|
|
* XXX: and may not entirely apply, but lacking something better:
|
|
* This is the generic part of fhtovp called after the underlying
|
|
* filesystem has validated the file handle.
|
|
*
|
|
* Verify that a host should have access to a filesystem.
|
|
*/
|
|
|
|
int
|
|
vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, int *extflagsp,
|
|
struct ucred **credanonp, int *numsecflavors, int **secflavors)
|
|
{
|
|
struct netcred *np;
|
|
|
|
lockmgr(&mp->mnt_explock, LK_SHARED, NULL);
|
|
np = vfs_export_lookup(mp, nam);
|
|
if (np == NULL) {
|
|
lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
|
|
*credanonp = NULL;
|
|
return (EACCES);
|
|
}
|
|
*extflagsp = np->netc_exflags;
|
|
if ((*credanonp = np->netc_anon) != NULL)
|
|
crhold(*credanonp);
|
|
if (numsecflavors)
|
|
*numsecflavors = np->netc_numsecflavors;
|
|
if (secflavors)
|
|
*secflavors = np->netc_secflavors;
|
|
lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
|
|
return (0);
|
|
}
|
|
|