484 lines
12 KiB
C
484 lines
12 KiB
C
/*-
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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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* 4. 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 <security/mac/mac_framework.h>
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NFSDLOCKMUTEX;
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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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static 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_newnfs);
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SVCPOOL *nfsrvd_pool;
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static int nfs_privport = 0;
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SYSCTL_INT(_vfs_newnfs, OID_AUTO, nfs_privport, CTLFLAG_RW,
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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_newnfs, OID_AUTO, server_min_nfsvers, CTLFLAG_RW,
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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_newnfs, OID_AUTO, server_max_nfsvers, CTLFLAG_RW,
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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, struct socket *,
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u_int64_t, struct nfsrvcache **);
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extern u_long sb_max_adj;
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extern int newnfs_numnfsd;
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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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svcerr_noproc(rqst);
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svc_freereq(rqst);
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return;
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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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return;
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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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return;
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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);
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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 b6[INET6_ADDRSTRLEN];
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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(b6, &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(sin->sin_addr), 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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return;
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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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return;
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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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return;
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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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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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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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m_freem(nd.nd_mrep);
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return;
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}
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}
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cacherep = nfs_proc(&nd, rqst->rq_xid, xprt->xp_socket,
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xprt->xp_sockref, &rp);
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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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return;
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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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return;
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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, xprt->xp_socket, 0);
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svc_freereq(rqst);
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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, struct socket *so,
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u_int64_t sockref, struct nfsrvcache **rpp)
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{
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struct thread *td = curthread;
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int cacherep = RC_DOIT, isdgram;
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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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NFSGETTIME(&nd->nd_starttime);
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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 = sockref;
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cacherep = nfsrvd_getcache(nd, so);
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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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nfsrvd_dorpc(nd, isdgram, td);
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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, so);
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}
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return (cacherep);
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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;
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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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return (error);
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}
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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)
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svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
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NULL);
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SVC_RELEASE(xprt);
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}
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return (0);
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}
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/*
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* Called by nfssvc() for nfsds. Just loops around servicing rpc requests
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* until it is killed by a signal.
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*/
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int
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nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
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{
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#ifdef KGSSAPI
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char principal[MAXHOSTNAMELEN + 5];
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int error;
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bool_t ret2, ret3, ret4;
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#endif
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#ifdef KGSSAPI
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error = copyinstr(args->principal, principal, sizeof (principal),
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NULL);
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if (error)
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return (error);
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#endif
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/*
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* Only the first nfsd actually does any work. The RPC code
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* adds threads to it as needed. Any extra processes offered
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* by nfsd just exit. If nfsd is new enough, it will call us
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* once with a structure that specifies how many threads to
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* use.
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*/
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NFSD_LOCK();
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if (newnfs_numnfsd == 0) {
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newnfs_numnfsd++;
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NFSD_UNLOCK();
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#ifdef KGSSAPI
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/* An empty string implies AUTH_SYS only. */
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if (principal[0] != '\0') {
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ret2 = rpc_gss_set_svc_name(principal, "kerberosv5",
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GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
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ret3 = rpc_gss_set_svc_name(principal, "kerberosv5",
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GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
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ret4 = rpc_gss_set_svc_name(principal, "kerberosv5",
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GSS_C_INDEFINITE, NFS_PROG, NFS_VER4);
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if (!ret2 || !ret3 || !ret4) {
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NFSD_LOCK();
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newnfs_numnfsd--;
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nfsrvd_init(1);
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NFSD_UNLOCK();
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return (EAUTH);
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}
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}
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#endif
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nfsrvd_pool->sp_minthreads = args->minthreads;
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nfsrvd_pool->sp_maxthreads = args->maxthreads;
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svc_run(nfsrvd_pool);
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#ifdef KGSSAPI
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if (principal[0] != '\0') {
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rpc_gss_clear_svc_name(NFS_PROG, NFS_VER2);
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rpc_gss_clear_svc_name(NFS_PROG, NFS_VER3);
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rpc_gss_clear_svc_name(NFS_PROG, NFS_VER4);
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}
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#endif
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NFSD_LOCK();
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newnfs_numnfsd--;
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nfsrvd_init(1);
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}
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NFSD_UNLOCK();
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return (0);
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}
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/*
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* Initialize the data structures for the server.
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* Handshake with any new nfsds starting up to avoid any chance of
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* corruption.
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*/
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void
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nfsrvd_init(int terminating)
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{
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NFSD_LOCK_ASSERT();
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if (terminating) {
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NFSD_UNLOCK();
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svcpool_destroy(nfsrvd_pool);
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nfsrvd_pool = NULL;
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NFSD_LOCK();
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}
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NFSD_UNLOCK();
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nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_newnfs));
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nfsrvd_pool->sp_rcache = NULL;
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nfsrvd_pool->sp_assign = NULL;
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nfsrvd_pool->sp_done = NULL;
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NFSD_LOCK();
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}
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