51369649b0
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
572 lines
14 KiB
C
572 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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*
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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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet6.h"
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#include "opt_kgssapi.h"
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#include <fs/nfs/nfsport.h>
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#include <rpc/rpc.h>
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#include <rpc/rpcsec_gss.h>
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#include <nfs/nfs_fha.h>
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#include <fs/nfsserver/nfs_fha_new.h>
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#include <security/mac/mac_framework.h>
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NFSDLOCKMUTEX;
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NFSV4ROOTLOCKMUTEX;
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struct nfsv4lock nfsd_suspend_lock;
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/*
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* Mapping of old NFS Version 2 RPC numbers to generic numbers.
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*/
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int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
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NFSPROC_NULL,
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NFSPROC_GETATTR,
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NFSPROC_SETATTR,
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NFSPROC_NOOP,
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NFSPROC_LOOKUP,
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NFSPROC_READLINK,
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NFSPROC_READ,
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NFSPROC_NOOP,
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NFSPROC_WRITE,
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NFSPROC_CREATE,
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NFSPROC_REMOVE,
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NFSPROC_RENAME,
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NFSPROC_LINK,
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NFSPROC_SYMLINK,
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NFSPROC_MKDIR,
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NFSPROC_RMDIR,
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NFSPROC_READDIR,
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NFSPROC_FSSTAT,
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NFSPROC_NOOP,
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NFSPROC_NOOP,
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NFSPROC_NOOP,
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NFSPROC_NOOP,
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};
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SYSCTL_DECL(_vfs_nfsd);
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SVCPOOL *nfsrvd_pool;
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static int nfs_privport = 0;
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SYSCTL_INT(_vfs_nfsd, OID_AUTO, nfs_privport, CTLFLAG_RWTUN,
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&nfs_privport, 0,
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"Only allow clients using a privileged port for NFSv2 and 3");
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static int nfs_minvers = NFS_VER2;
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SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers, CTLFLAG_RWTUN,
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&nfs_minvers, 0, "The lowest version of NFS handled by the server");
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static int nfs_maxvers = NFS_VER4;
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SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_max_nfsvers, CTLFLAG_RWTUN,
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&nfs_maxvers, 0, "The highest version of NFS handled by the server");
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static int nfs_proc(struct nfsrv_descript *, u_int32_t, SVCXPRT *xprt,
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struct nfsrvcache **);
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extern u_long sb_max_adj;
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extern int newnfs_numnfsd;
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extern struct proc *nfsd_master_proc;
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/*
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* NFS server system calls
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*/
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static void
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nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
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{
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struct nfsrv_descript nd;
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struct nfsrvcache *rp = NULL;
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int cacherep, credflavor;
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memset(&nd, 0, sizeof(nd));
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if (rqst->rq_vers == NFS_VER2) {
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if (rqst->rq_proc > NFSV2PROC_STATFS ||
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newnfs_nfsv3_procid[rqst->rq_proc] == NFSPROC_NOOP) {
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svcerr_noproc(rqst);
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svc_freereq(rqst);
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goto out;
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}
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nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
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nd.nd_flag = ND_NFSV2;
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} else if (rqst->rq_vers == NFS_VER3) {
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if (rqst->rq_proc >= NFS_V3NPROCS) {
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svcerr_noproc(rqst);
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svc_freereq(rqst);
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goto out;
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}
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nd.nd_procnum = rqst->rq_proc;
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nd.nd_flag = ND_NFSV3;
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} else {
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if (rqst->rq_proc != NFSPROC_NULL &&
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rqst->rq_proc != NFSV4PROC_COMPOUND) {
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svcerr_noproc(rqst);
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svc_freereq(rqst);
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goto out;
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}
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nd.nd_procnum = rqst->rq_proc;
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nd.nd_flag = ND_NFSV4;
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}
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/*
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* Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
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* NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
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* mounts.
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*/
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nd.nd_mrep = rqst->rq_args;
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rqst->rq_args = NULL;
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newnfs_realign(&nd.nd_mrep, M_WAITOK);
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nd.nd_md = nd.nd_mrep;
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nd.nd_dpos = mtod(nd.nd_md, caddr_t);
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nd.nd_nam = svc_getrpccaller(rqst);
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nd.nd_nam2 = rqst->rq_addr;
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nd.nd_mreq = NULL;
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nd.nd_cred = NULL;
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if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) {
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/* Check if source port is privileged */
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u_short port;
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struct sockaddr *nam = nd.nd_nam;
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struct sockaddr_in *sin;
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sin = (struct sockaddr_in *)nam;
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/*
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* INET/INET6 - same code:
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* sin_port and sin6_port are at same offset
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*/
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port = ntohs(sin->sin_port);
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if (port >= IPPORT_RESERVED &&
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nd.nd_procnum != NFSPROC_NULL) {
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#ifdef INET6
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char buf[INET6_ADDRSTRLEN];
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#else
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char buf[INET_ADDRSTRLEN];
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#endif
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#ifdef INET6
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#if defined(KLD_MODULE)
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/* Do not use ip6_sprintf: the nfs module should work without INET6. */
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#define ip6_sprintf(buf, a) \
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(sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
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(a)->s6_addr16[0], (a)->s6_addr16[1], \
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(a)->s6_addr16[2], (a)->s6_addr16[3], \
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(a)->s6_addr16[4], (a)->s6_addr16[5], \
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(a)->s6_addr16[6], (a)->s6_addr16[7]), \
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(buf))
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#endif
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#endif
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printf("NFS request from unprivileged port (%s:%d)\n",
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#ifdef INET6
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sin->sin_family == AF_INET6 ?
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ip6_sprintf(buf, &satosin6(sin)->sin6_addr) :
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#if defined(KLD_MODULE)
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#undef ip6_sprintf
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#endif
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#endif
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inet_ntoa_r(sin->sin_addr, buf), port);
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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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m_freem(nd.nd_mrep);
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goto out;
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}
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}
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if (nd.nd_procnum != NFSPROC_NULL) {
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if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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m_freem(nd.nd_mrep);
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goto out;
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}
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/* Set the flag based on credflavor */
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if (credflavor == RPCSEC_GSS_KRB5) {
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nd.nd_flag |= ND_GSS;
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} else if (credflavor == RPCSEC_GSS_KRB5I) {
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nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
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} else if (credflavor == RPCSEC_GSS_KRB5P) {
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nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
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} else if (credflavor != AUTH_SYS) {
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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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m_freem(nd.nd_mrep);
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goto out;
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}
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#ifdef MAC
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mac_cred_associate_nfsd(nd.nd_cred);
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#endif
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/*
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* Get a refcnt (shared lock) on nfsd_suspend_lock.
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* NFSSVC_SUSPENDNFSD will take an exclusive lock on
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* nfsd_suspend_lock to suspend these threads.
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* The call to nfsv4_lock() that precedes nfsv4_getref()
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* ensures that the acquisition of the exclusive lock
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* takes priority over acquisition of the shared lock by
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* waiting for any exclusive lock request to complete.
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* This must be done here, before the check of
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* nfsv4root exports by nfsvno_v4rootexport().
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*/
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NFSLOCKV4ROOTMUTEX();
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nfsv4_lock(&nfsd_suspend_lock, 0, NULL, NFSV4ROOTLOCKMUTEXPTR,
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NULL);
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nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR,
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NULL);
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NFSUNLOCKV4ROOTMUTEX();
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if ((nd.nd_flag & ND_NFSV4) != 0) {
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nd.nd_repstat = nfsvno_v4rootexport(&nd);
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if (nd.nd_repstat != 0) {
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NFSLOCKV4ROOTMUTEX();
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nfsv4_relref(&nfsd_suspend_lock);
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NFSUNLOCKV4ROOTMUTEX();
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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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m_freem(nd.nd_mrep);
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goto out;
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}
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}
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cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp);
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NFSLOCKV4ROOTMUTEX();
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nfsv4_relref(&nfsd_suspend_lock);
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NFSUNLOCKV4ROOTMUTEX();
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} else {
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NFSMGET(nd.nd_mreq);
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nd.nd_mreq->m_len = 0;
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cacherep = RC_REPLY;
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}
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if (nd.nd_mrep != NULL)
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m_freem(nd.nd_mrep);
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if (nd.nd_cred != NULL)
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crfree(nd.nd_cred);
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if (cacherep == RC_DROPIT) {
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if (nd.nd_mreq != NULL)
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m_freem(nd.nd_mreq);
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svc_freereq(rqst);
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goto out;
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}
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if (nd.nd_mreq == NULL) {
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svcerr_decode(rqst);
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svc_freereq(rqst);
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goto out;
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}
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if (nd.nd_repstat & NFSERR_AUTHERR) {
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svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
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if (nd.nd_mreq != NULL)
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m_freem(nd.nd_mreq);
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} else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
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svcerr_systemerr(rqst);
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}
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if (rp != NULL) {
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nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 ||
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SVC_ACK(xprt, NULL)), rqst->rq_reply_seq);
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}
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svc_freereq(rqst);
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out:
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td_softdep_cleanup(curthread);
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NFSEXITCODE(0);
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}
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/*
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* Check the cache and, optionally, do the RPC.
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* Return the appropriate cache response.
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*/
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static int
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nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt,
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struct nfsrvcache **rpp)
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{
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struct thread *td = curthread;
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int cacherep = RC_DOIT, isdgram, taglen = -1;
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struct mbuf *m;
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u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL;
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u_int32_t minorvers = 0;
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uint32_t ack;
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*rpp = NULL;
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if (nd->nd_nam2 == NULL) {
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nd->nd_flag |= ND_STREAMSOCK;
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isdgram = 0;
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} else {
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isdgram = 1;
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}
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/*
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* Two cases:
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* 1 - For NFSv2 over UDP, if we are near our malloc/mget
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* limit, just drop the request. There is no
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* NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
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* client will timeout/retry over UDP in a little while.
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* 2 - nd_repstat == 0 && nd_mreq == NULL, which
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* means a normal nfs rpc, so check the cache
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*/
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if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
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nfsrv_mallocmget_limit()) {
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cacherep = RC_DROPIT;
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} else {
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/*
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* For NFSv3, play it safe and assume that the client is
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* doing retries on the same TCP connection.
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*/
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if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
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ND_STREAMSOCK)
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nd->nd_flag |= ND_SAMETCPCONN;
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nd->nd_retxid = xid;
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nd->nd_tcpconntime = NFSD_MONOSEC;
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nd->nd_sockref = xprt->xp_sockref;
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if ((nd->nd_flag & ND_NFSV4) != 0)
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nfsd_getminorvers(nd, tag, &tagstr, &taglen,
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&minorvers);
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if ((nd->nd_flag & ND_NFSV41) != 0)
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/* NFSv4.1 caches replies in the session slots. */
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cacherep = RC_DOIT;
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else {
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cacherep = nfsrvd_getcache(nd);
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ack = 0;
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SVC_ACK(xprt, &ack);
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nfsrc_trimcache(xprt->xp_sockref, ack, 0);
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}
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}
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/*
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* Handle the request. There are three cases.
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* RC_DOIT - do the RPC
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* RC_REPLY - return the reply already created
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* RC_DROPIT - just throw the request away
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*/
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if (cacherep == RC_DOIT) {
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if ((nd->nd_flag & ND_NFSV41) != 0)
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nd->nd_xprt = xprt;
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nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers, td);
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if ((nd->nd_flag & ND_NFSV41) != 0) {
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if (nd->nd_repstat != NFSERR_REPLYFROMCACHE &&
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(nd->nd_flag & ND_SAVEREPLY) != 0) {
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/* Cache a copy of the reply. */
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m = m_copym(nd->nd_mreq, 0, M_COPYALL,
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M_WAITOK);
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} else
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m = NULL;
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if ((nd->nd_flag & ND_HASSEQUENCE) != 0)
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nfsrv_cache_session(nd->nd_sessionid,
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nd->nd_slotid, nd->nd_repstat, &m);
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if (nd->nd_repstat == NFSERR_REPLYFROMCACHE)
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nd->nd_repstat = 0;
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cacherep = RC_REPLY;
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} else {
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if (nd->nd_repstat == NFSERR_DONTREPLY)
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cacherep = RC_DROPIT;
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else
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cacherep = RC_REPLY;
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*rpp = nfsrvd_updatecache(nd);
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}
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}
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if (tagstr != NULL && taglen > NFSV4_SMALLSTR)
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free(tagstr, M_TEMP);
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NFSEXITCODE2(0, nd);
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return (cacherep);
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}
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static void
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nfssvc_loss(SVCXPRT *xprt)
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{
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uint32_t ack;
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ack = 0;
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SVC_ACK(xprt, &ack);
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nfsrc_trimcache(xprt->xp_sockref, ack, 1);
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}
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/*
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* Adds a socket to the list for servicing by nfsds.
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*/
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int
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nfsrvd_addsock(struct file *fp)
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{
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int siz;
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struct socket *so;
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int error = 0;
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SVCXPRT *xprt;
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static u_int64_t sockref = 0;
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so = fp->f_data;
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siz = sb_max_adj;
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error = soreserve(so, siz, siz);
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if (error)
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goto out;
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/*
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* Steal the socket from userland so that it doesn't close
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* unexpectedly.
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*/
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if (so->so_type == SOCK_DGRAM)
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xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
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else
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xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
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if (xprt) {
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fp->f_ops = &badfileops;
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fp->f_data = NULL;
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xprt->xp_sockref = ++sockref;
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if (nfs_minvers == NFS_VER2)
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svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
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NULL);
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if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
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svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
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NULL);
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if (nfs_maxvers >= NFS_VER4)
|
|
svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
|
|
NULL);
|
|
if (so->so_type == SOCK_STREAM)
|
|
svc_loss_reg(xprt, nfssvc_loss);
|
|
SVC_RELEASE(xprt);
|
|
}
|
|
|
|
out:
|
|
NFSEXITCODE(error);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Called by nfssvc() for nfsds. Just loops around servicing rpc requests
|
|
* until it is killed by a signal.
|
|
*/
|
|
int
|
|
nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
|
|
{
|
|
char principal[MAXHOSTNAMELEN + 5];
|
|
struct proc *p;
|
|
int error = 0;
|
|
bool_t ret2, ret3, ret4;
|
|
|
|
error = copyinstr(args->principal, principal, sizeof (principal),
|
|
NULL);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Only the first nfsd actually does any work. The RPC code
|
|
* adds threads to it as needed. Any extra processes offered
|
|
* by nfsd just exit. If nfsd is new enough, it will call us
|
|
* once with a structure that specifies how many threads to
|
|
* use.
|
|
*/
|
|
NFSD_LOCK();
|
|
if (newnfs_numnfsd == 0) {
|
|
p = td->td_proc;
|
|
PROC_LOCK(p);
|
|
p->p_flag2 |= P2_AST_SU;
|
|
PROC_UNLOCK(p);
|
|
newnfs_numnfsd++;
|
|
|
|
NFSD_UNLOCK();
|
|
|
|
/* An empty string implies AUTH_SYS only. */
|
|
if (principal[0] != '\0') {
|
|
ret2 = rpc_gss_set_svc_name_call(principal,
|
|
"kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
|
|
ret3 = rpc_gss_set_svc_name_call(principal,
|
|
"kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
|
|
ret4 = rpc_gss_set_svc_name_call(principal,
|
|
"kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER4);
|
|
|
|
if (!ret2 || !ret3 || !ret4)
|
|
printf("nfsd: can't register svc name\n");
|
|
}
|
|
|
|
nfsrvd_pool->sp_minthreads = args->minthreads;
|
|
nfsrvd_pool->sp_maxthreads = args->maxthreads;
|
|
|
|
svc_run(nfsrvd_pool);
|
|
|
|
if (principal[0] != '\0') {
|
|
rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
|
|
rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
|
|
rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4);
|
|
}
|
|
|
|
NFSD_LOCK();
|
|
newnfs_numnfsd--;
|
|
nfsrvd_init(1);
|
|
PROC_LOCK(p);
|
|
p->p_flag2 &= ~P2_AST_SU;
|
|
PROC_UNLOCK(p);
|
|
}
|
|
NFSD_UNLOCK();
|
|
|
|
out:
|
|
NFSEXITCODE(error);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Initialize the data structures for the server.
|
|
* Handshake with any new nfsds starting up to avoid any chance of
|
|
* corruption.
|
|
*/
|
|
void
|
|
nfsrvd_init(int terminating)
|
|
{
|
|
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
if (terminating) {
|
|
nfsd_master_proc = NULL;
|
|
NFSD_UNLOCK();
|
|
nfsrv_freeallbackchannel_xprts();
|
|
svcpool_close(nfsrvd_pool);
|
|
NFSD_LOCK();
|
|
} else {
|
|
NFSD_UNLOCK();
|
|
nfsrvd_pool = svcpool_create("nfsd",
|
|
SYSCTL_STATIC_CHILDREN(_vfs_nfsd));
|
|
nfsrvd_pool->sp_rcache = NULL;
|
|
nfsrvd_pool->sp_assign = fhanew_assign;
|
|
nfsrvd_pool->sp_done = fha_nd_complete;
|
|
NFSD_LOCK();
|
|
}
|
|
}
|
|
|