430 lines
11 KiB
C
430 lines
11 KiB
C
/* $NetBSD: nfs_srvsubs.c,v 1.15 2020/01/17 20:08:09 ad Exp $ */
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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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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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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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* @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95
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*/
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/*
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* Copyright 2000 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Frank van der Linden for Wasabi Systems, 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: nfs_srvsubs.c,v 1.15 2020/01/17 20:08:09 ad Exp $");
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/kmem.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/filedesc.h>
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#include <sys/time.h>
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#include <sys/dirent.h>
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#include <sys/once.h>
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#include <sys/kauth.h>
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#include <sys/atomic.h>
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#include <uvm/uvm_extern.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfs/nfsnode.h>
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#include <nfs/nfs.h>
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#include <nfs/xdr_subs.h>
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#include <nfs/nfsm_subs.h>
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#include <nfs/nfsmount.h>
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#include <nfs/nfsrtt.h>
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#include <nfs/nfs_var.h>
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#include <miscfs/specfs/specdev.h>
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#include <netinet/in.h>
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/*
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* Set up nameidata for a lookup() call and do it.
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*
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* If pubflag is set, this call is done for a lookup operation on the
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* public filehandle. In that case we allow crossing mountpoints and
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* absolute pathnames. However, the caller is expected to check that
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* the lookup result is within the public fs, and deny access if
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* it is not.
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*/
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int
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nfs_namei(struct nameidata *ndp, nfsrvfh_t *nsfh, uint32_t len, struct nfssvc_sock *slp, struct mbuf *nam, struct mbuf **mdp, char **dposp, struct vnode **retdirp, struct lwp *l, int kerbflag, int pubflag)
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{
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int i, rem;
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struct mbuf *md;
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char *fromcp, *tocp, *cp, *path;
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struct vnode *dp;
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int error, rdonly;
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int neverfollow;
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struct componentname *cnp = &ndp->ni_cnd;
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*retdirp = NULL;
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ndp->ni_pathbuf = NULL;
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if ((len + 1) > NFS_MAXPATHLEN)
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return (ENAMETOOLONG);
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if (len == 0)
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return (EACCES);
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/*
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* Copy the name from the mbuf list to ndp->ni_pathbuf
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* and set the various ndp fields appropriately.
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*/
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path = PNBUF_GET();
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fromcp = *dposp;
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tocp = path;
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md = *mdp;
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rem = mtod(md, char *) + md->m_len - fromcp;
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for (i = 0; i < len; i++) {
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while (rem == 0) {
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md = md->m_next;
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if (md == NULL) {
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error = EBADRPC;
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goto out;
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}
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fromcp = mtod(md, void *);
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rem = md->m_len;
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}
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if (*fromcp == '\0' || (!pubflag && *fromcp == '/')) {
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error = EACCES;
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goto out;
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}
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*tocp++ = *fromcp++;
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rem--;
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}
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*tocp = '\0';
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*mdp = md;
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*dposp = fromcp;
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len = nfsm_rndup(len)-len;
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if (len > 0) {
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if (rem >= len)
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*dposp += len;
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else if ((error = nfs_adv(mdp, dposp, len, rem)) != 0)
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goto out;
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}
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/*
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* Extract and set starting directory.
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*/
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error = nfsrv_fhtovp(nsfh, false, &dp, ndp->ni_cnd.cn_cred, slp,
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nam, &rdonly, kerbflag, pubflag);
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if (error)
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goto out;
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if (dp->v_type != VDIR) {
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vrele(dp);
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error = ENOTDIR;
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goto out;
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}
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if (rdonly)
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cnp->cn_flags |= RDONLY;
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*retdirp = dp;
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if (pubflag) {
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/*
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* Oh joy. For WebNFS, handle those pesky '%' escapes,
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* and the 'native path' indicator.
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*/
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cp = PNBUF_GET();
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fromcp = path;
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tocp = cp;
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if ((unsigned char)*fromcp >= WEBNFS_SPECCHAR_START) {
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switch ((unsigned char)*fromcp) {
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case WEBNFS_NATIVE_CHAR:
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/*
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* 'Native' path for us is the same
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* as a path according to the NFS spec,
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* just skip the escape char.
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*/
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fromcp++;
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break;
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/*
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* More may be added in the future, range 0x80-0xff
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*/
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default:
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error = EIO;
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vrele(dp);
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PNBUF_PUT(cp);
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goto out;
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}
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}
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/*
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* Translate the '%' escapes, URL-style.
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*/
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while (*fromcp != '\0') {
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if (*fromcp == WEBNFS_ESC_CHAR) {
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if (fromcp[1] != '\0' && fromcp[2] != '\0') {
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fromcp++;
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*tocp++ = HEXSTRTOI(fromcp);
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fromcp += 2;
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continue;
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} else {
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error = ENOENT;
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vrele(dp);
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PNBUF_PUT(cp);
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goto out;
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}
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} else
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*tocp++ = *fromcp++;
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}
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*tocp = '\0';
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PNBUF_PUT(path);
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path = cp;
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}
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ndp->ni_atdir = NULL;
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ndp->ni_pathbuf = pathbuf_assimilate(path);
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if (ndp->ni_pathbuf == NULL) {
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error = ENOMEM;
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goto out;
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}
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if (pubflag) {
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if (path[0] == '/')
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dp = rootvnode;
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} else {
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cnp->cn_flags |= NOCROSSMOUNT;
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}
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neverfollow = !pubflag;
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/*
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* And call lookup() to do the real work
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*
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* Note: ndp->ni_pathbuf is left undestroyed on success;
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* caller must clean it up.
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*/
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error = lookup_for_nfsd(ndp, dp, neverfollow);
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if (error) {
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goto out;
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}
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return 0;
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out:
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if (ndp->ni_pathbuf != NULL) {
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pathbuf_destroy(ndp->ni_pathbuf);
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ndp->ni_pathbuf = NULL;
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} else {
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PNBUF_PUT(path);
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}
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return (error);
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}
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/*
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* nfsrv_fhtovp() - convert a fh to a vnode ptr (optionally locked)
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* - look up fsid in mount list (if not found ret error)
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* - get vp and export rights by calling VFS_FHTOVP()
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* - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
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* - if not lockflag unlock it with VOP_UNLOCK()
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*/
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int
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nfsrv_fhtovp(nfsrvfh_t *nsfh, int lockflag, struct vnode **vpp,
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kauth_cred_t cred, struct nfssvc_sock *slp, struct mbuf *nam, int *rdonlyp,
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int kerbflag, int pubflag)
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{
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struct mount *mp;
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kauth_cred_t credanon;
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int error, exflags;
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struct sockaddr_in *saddr;
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fhandle_t *fhp;
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fhp = NFSRVFH_FHANDLE(nsfh);
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*vpp = (struct vnode *)0;
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if (nfs_ispublicfh(nsfh)) {
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if (!pubflag || !nfs_pub.np_valid)
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return (ESTALE);
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fhp = nfs_pub.np_handle;
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}
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error = netexport_check(&fhp->fh_fsid, nam, &mp, &exflags, &credanon);
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if (error) {
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return error;
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}
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error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, vpp);
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if (error)
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return (error);
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if (!(exflags & (MNT_EXNORESPORT|MNT_EXPUBLIC))) {
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saddr = mtod(nam, struct sockaddr_in *);
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if ((saddr->sin_family == AF_INET) &&
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ntohs(saddr->sin_port) >= IPPORT_RESERVED) {
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vput(*vpp);
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return (NFSERR_AUTHERR | AUTH_TOOWEAK);
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}
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if ((saddr->sin_family == AF_INET6) &&
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ntohs(saddr->sin_port) >= IPV6PORT_RESERVED) {
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vput(*vpp);
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return (NFSERR_AUTHERR | AUTH_TOOWEAK);
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}
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}
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/*
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* Check/setup credentials.
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*/
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if (exflags & MNT_EXKERB) {
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if (!kerbflag) {
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vput(*vpp);
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return (NFSERR_AUTHERR | AUTH_TOOWEAK);
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}
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} else if (kerbflag) {
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vput(*vpp);
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return (NFSERR_AUTHERR | AUTH_TOOWEAK);
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} else if (kauth_cred_geteuid(cred) == 0 || /* NFS maproot, see below */
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(exflags & MNT_EXPORTANON)) {
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/*
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* This is used by the NFS maproot option. While we can change
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* the secmodel on our own host, we can't change it on the
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* clients. As means of least surprise, we're doing the
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* traditional thing here.
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* Should look into adding a "mapprivileged" or similar where
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* the users can be explicitly specified...
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* [elad, yamt 2008-03-05]
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*/
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kauth_cred_clone(credanon, cred);
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}
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if (exflags & MNT_EXRDONLY)
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*rdonlyp = 1;
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else
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*rdonlyp = 0;
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if (!lockflag)
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VOP_UNLOCK(*vpp);
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return (0);
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}
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/*
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* WebNFS: check if a filehandle is a public filehandle. For v3, this
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* means a length of 0, for v2 it means all zeroes.
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*/
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int
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nfs_ispublicfh(const nfsrvfh_t *nsfh)
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{
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const char *cp = (const void *)(NFSRVFH_DATA(nsfh));
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int i;
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if (NFSRVFH_SIZE(nsfh) == 0) {
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return true;
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}
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if (NFSRVFH_SIZE(nsfh) != NFSX_V2FH) {
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return false;
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}
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for (i = 0; i < NFSX_V2FH; i++)
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if (*cp++ != 0)
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return false;
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return true;
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}
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int
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nfsrv_composefh(struct vnode *vp, nfsrvfh_t *nsfh, bool v3)
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{
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int error;
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size_t fhsize;
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fhsize = NFSD_MAXFHSIZE;
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error = vfs_composefh(vp, (void *)NFSRVFH_DATA(nsfh), &fhsize);
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if (NFSX_FHTOOBIG_P(fhsize, v3)) {
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error = EOPNOTSUPP;
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}
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if (error != 0) {
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return error;
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}
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if (!v3 && fhsize < NFSX_V2FH) {
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memset((char *)NFSRVFH_DATA(nsfh) + fhsize, 0,
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NFSX_V2FH - fhsize);
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fhsize = NFSX_V2FH;
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}
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if ((fhsize % NFSX_UNSIGNED) != 0) {
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return EOPNOTSUPP;
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}
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nsfh->nsfh_size = fhsize;
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return 0;
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}
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int
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nfsrv_comparefh(const nfsrvfh_t *fh1, const nfsrvfh_t *fh2)
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{
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if (NFSRVFH_SIZE(fh1) != NFSRVFH_SIZE(fh2)) {
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return NFSRVFH_SIZE(fh2) - NFSRVFH_SIZE(fh1);
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}
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return memcmp(NFSRVFH_DATA(fh1), NFSRVFH_DATA(fh2), NFSRVFH_SIZE(fh1));
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}
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void
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nfsrv_copyfh(nfsrvfh_t *fh1, const nfsrvfh_t *fh2)
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{
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size_t size;
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fh1->nsfh_size = size = NFSRVFH_SIZE(fh2);
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memcpy(NFSRVFH_DATA(fh1), NFSRVFH_DATA(fh2), size);
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}
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