1 /*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: releng/8.0/sys/fs/nfsserver/nfs_nfsdkrpc.c 194408 2009-06-17 22:55:59Z rmacklem $");
36
37 #include "opt_inet6.h"
38 #include "opt_kgssapi.h"
39
40 #include <fs/nfs/nfsport.h>
41
42 #include <rpc/rpc.h>
43 #include <rpc/rpcsec_gss.h>
44
45 #include <security/mac/mac_framework.h>
46
47 NFSDLOCKMUTEX;
48
49 /*
50 * Mapping of old NFS Version 2 RPC numbers to generic numbers.
51 */
52 static int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
53 NFSPROC_NULL,
54 NFSPROC_GETATTR,
55 NFSPROC_SETATTR,
56 NFSPROC_NOOP,
57 NFSPROC_LOOKUP,
58 NFSPROC_READLINK,
59 NFSPROC_READ,
60 NFSPROC_NOOP,
61 NFSPROC_WRITE,
62 NFSPROC_CREATE,
63 NFSPROC_REMOVE,
64 NFSPROC_RENAME,
65 NFSPROC_LINK,
66 NFSPROC_SYMLINK,
67 NFSPROC_MKDIR,
68 NFSPROC_RMDIR,
69 NFSPROC_READDIR,
70 NFSPROC_FSSTAT,
71 NFSPROC_NOOP,
72 NFSPROC_NOOP,
73 NFSPROC_NOOP,
74 NFSPROC_NOOP,
75 };
76
77
78 SYSCTL_DECL(_vfs_newnfs);
79
80 SVCPOOL *nfsrvd_pool;
81
82 static int nfs_privport = 0;
83 SYSCTL_INT(_vfs_newnfs, OID_AUTO, nfs_privport, CTLFLAG_RW,
84 &nfs_privport, 0,
85 "Only allow clients using a privileged port for NFSv2 and 3");
86
87 static int nfs_minvers = NFS_VER2;
88 SYSCTL_INT(_vfs_newnfs, OID_AUTO, server_min_nfsvers, CTLFLAG_RW,
89 &nfs_minvers, 0, "The lowest version of NFS handled by the server");
90
91 static int nfs_maxvers = NFS_VER4;
92 SYSCTL_INT(_vfs_newnfs, OID_AUTO, server_max_nfsvers, CTLFLAG_RW,
93 &nfs_maxvers, 0, "The highest version of NFS handled by the server");
94
95 static int nfs_proc(struct nfsrv_descript *, u_int32_t, struct socket *,
96 u_int64_t, struct nfsrvcache **);
97
98 extern u_long sb_max_adj;
99 extern int newnfs_numnfsd;
100
101 /*
102 * NFS server system calls
103 */
104
105 static void
106 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
107 {
108 struct nfsrv_descript nd;
109 struct nfsrvcache *rp = NULL;
110 int cacherep, credflavor;
111
112 memset(&nd, 0, sizeof(nd));
113 if (rqst->rq_vers == NFS_VER2) {
114 if (rqst->rq_proc > NFSV2PROC_STATFS) {
115 svcerr_noproc(rqst);
116 svc_freereq(rqst);
117 return;
118 }
119 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
120 nd.nd_flag = ND_NFSV2;
121 } else if (rqst->rq_vers == NFS_VER3) {
122 if (rqst->rq_proc >= NFS_V3NPROCS) {
123 svcerr_noproc(rqst);
124 svc_freereq(rqst);
125 return;
126 }
127 nd.nd_procnum = rqst->rq_proc;
128 nd.nd_flag = ND_NFSV3;
129 } else {
130 if (rqst->rq_proc != NFSPROC_NULL &&
131 rqst->rq_proc != NFSV4PROC_COMPOUND) {
132 svcerr_noproc(rqst);
133 svc_freereq(rqst);
134 return;
135 }
136 nd.nd_procnum = rqst->rq_proc;
137 nd.nd_flag = ND_NFSV4;
138 }
139
140 /*
141 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
142 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
143 * mounts.
144 */
145 nd.nd_mrep = rqst->rq_args;
146 rqst->rq_args = NULL;
147 newnfs_realign(&nd.nd_mrep);
148 nd.nd_md = nd.nd_mrep;
149 nd.nd_dpos = mtod(nd.nd_md, caddr_t);
150 nd.nd_nam = svc_getrpccaller(rqst);
151 nd.nd_nam2 = rqst->rq_addr;
152 nd.nd_mreq = NULL;
153 nd.nd_cred = NULL;
154
155 if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) {
156 /* Check if source port is privileged */
157 u_short port;
158 struct sockaddr *nam = nd.nd_nam;
159 struct sockaddr_in *sin;
160
161 sin = (struct sockaddr_in *)nam;
162 /*
163 * INET/INET6 - same code:
164 * sin_port and sin6_port are at same offset
165 */
166 port = ntohs(sin->sin_port);
167 if (port >= IPPORT_RESERVED &&
168 nd.nd_procnum != NFSPROC_NULL) {
169 #ifdef INET6
170 char b6[INET6_ADDRSTRLEN];
171 #if defined(KLD_MODULE)
172 /* Do not use ip6_sprintf: the nfs module should work without INET6. */
173 #define ip6_sprintf(buf, a) \
174 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
175 (a)->s6_addr16[0], (a)->s6_addr16[1], \
176 (a)->s6_addr16[2], (a)->s6_addr16[3], \
177 (a)->s6_addr16[4], (a)->s6_addr16[5], \
178 (a)->s6_addr16[6], (a)->s6_addr16[7]), \
179 (buf))
180 #endif
181 #endif
182 printf("NFS request from unprivileged port (%s:%d)\n",
183 #ifdef INET6
184 sin->sin_family == AF_INET6 ?
185 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
186 #if defined(KLD_MODULE)
187 #undef ip6_sprintf
188 #endif
189 #endif
190 inet_ntoa(sin->sin_addr), port);
191 svcerr_weakauth(rqst);
192 svc_freereq(rqst);
193 m_freem(nd.nd_mrep);
194 return;
195 }
196 }
197
198 if (nd.nd_procnum != NFSPROC_NULL) {
199 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
200 svcerr_weakauth(rqst);
201 svc_freereq(rqst);
202 m_freem(nd.nd_mrep);
203 return;
204 }
205
206 /* Set the flag based on credflavor */
207 if (credflavor == RPCSEC_GSS_KRB5) {
208 nd.nd_flag |= ND_GSS;
209 } else if (credflavor == RPCSEC_GSS_KRB5I) {
210 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
211 } else if (credflavor == RPCSEC_GSS_KRB5P) {
212 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
213 } else if (credflavor != AUTH_SYS) {
214 svcerr_weakauth(rqst);
215 svc_freereq(rqst);
216 m_freem(nd.nd_mrep);
217 return;
218 }
219
220 #ifdef MAC
221 mac_cred_associate_nfsd(nd.nd_cred);
222 #endif
223 if ((nd.nd_flag & ND_NFSV4) != 0) {
224 nd.nd_repstat = nfsvno_v4rootexport(&nd);
225 if (nd.nd_repstat != 0) {
226 svcerr_weakauth(rqst);
227 svc_freereq(rqst);
228 m_freem(nd.nd_mrep);
229 return;
230 }
231 }
232
233 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt->xp_socket,
234 xprt->xp_sockref, &rp);
235 } else {
236 NFSMGET(nd.nd_mreq);
237 nd.nd_mreq->m_len = 0;
238 cacherep = RC_REPLY;
239 }
240 if (nd.nd_mrep != NULL)
241 m_freem(nd.nd_mrep);
242
243 if (nd.nd_cred != NULL)
244 crfree(nd.nd_cred);
245
246 if (cacherep == RC_DROPIT) {
247 if (nd.nd_mreq != NULL)
248 m_freem(nd.nd_mreq);
249 svc_freereq(rqst);
250 return;
251 }
252
253 if (nd.nd_mreq == NULL) {
254 svcerr_decode(rqst);
255 svc_freereq(rqst);
256 return;
257 }
258
259 if (nd.nd_repstat & NFSERR_AUTHERR) {
260 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
261 if (nd.nd_mreq != NULL)
262 m_freem(nd.nd_mreq);
263 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
264 svcerr_systemerr(rqst);
265 }
266 if (rp != NULL)
267 nfsrvd_sentcache(rp, xprt->xp_socket, 0);
268 svc_freereq(rqst);
269 }
270
271 /*
272 * Check the cache and, optionally, do the RPC.
273 * Return the appropriate cache response.
274 */
275 static int
276 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, struct socket *so,
277 u_int64_t sockref, struct nfsrvcache **rpp)
278 {
279 struct thread *td = curthread;
280 int cacherep = RC_DOIT, isdgram;
281
282 *rpp = NULL;
283 if (nd->nd_nam2 == NULL) {
284 nd->nd_flag |= ND_STREAMSOCK;
285 isdgram = 0;
286 } else {
287 isdgram = 1;
288 }
289 NFSGETTIME(&nd->nd_starttime);
290
291 /*
292 * Two cases:
293 * 1 - For NFSv2 over UDP, if we are near our malloc/mget
294 * limit, just drop the request. There is no
295 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
296 * client will timeout/retry over UDP in a little while.
297 * 2 - nd_repstat == 0 && nd_mreq == NULL, which
298 * means a normal nfs rpc, so check the cache
299 */
300 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
301 nfsrv_mallocmget_limit()) {
302 cacherep = RC_DROPIT;
303 } else {
304 /*
305 * For NFSv3, play it safe and assume that the client is
306 * doing retries on the same TCP connection.
307 */
308 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
309 ND_STREAMSOCK)
310 nd->nd_flag |= ND_SAMETCPCONN;
311 nd->nd_retxid = xid;
312 nd->nd_tcpconntime = NFSD_MONOSEC;
313 nd->nd_sockref = sockref;
314 cacherep = nfsrvd_getcache(nd, so);
315 }
316
317 /*
318 * Handle the request. There are three cases.
319 * RC_DOIT - do the RPC
320 * RC_REPLY - return the reply already created
321 * RC_DROPIT - just throw the request away
322 */
323 if (cacherep == RC_DOIT) {
324 nfsrvd_dorpc(nd, isdgram, td);
325 if (nd->nd_repstat == NFSERR_DONTREPLY)
326 cacherep = RC_DROPIT;
327 else
328 cacherep = RC_REPLY;
329 *rpp = nfsrvd_updatecache(nd, so);
330 }
331 return (cacherep);
332 }
333
334 /*
335 * Adds a socket to the list for servicing by nfsds.
336 */
337 int
338 nfsrvd_addsock(struct file *fp)
339 {
340 int siz;
341 struct socket *so;
342 int error;
343 SVCXPRT *xprt;
344 static u_int64_t sockref = 0;
345
346 so = fp->f_data;
347
348 siz = sb_max_adj;
349 error = soreserve(so, siz, siz);
350 if (error) {
351 return (error);
352 }
353
354 /*
355 * Steal the socket from userland so that it doesn't close
356 * unexpectedly.
357 */
358 if (so->so_type == SOCK_DGRAM)
359 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
360 else
361 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
362 if (xprt) {
363 fp->f_ops = &badfileops;
364 fp->f_data = NULL;
365 xprt->xp_sockref = ++sockref;
366 if (nfs_minvers == NFS_VER2)
367 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
368 NULL);
369 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
370 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
371 NULL);
372 if (nfs_maxvers >= NFS_VER4)
373 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
374 NULL);
375 SVC_RELEASE(xprt);
376 }
377
378 return (0);
379 }
380
381 /*
382 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
383 * until it is killed by a signal.
384 */
385 int
386 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
387 {
388 #ifdef KGSSAPI
389 char principal[MAXHOSTNAMELEN + 5];
390 int error;
391 bool_t ret2, ret3, ret4;
392 #endif
393
394 #ifdef KGSSAPI
395 error = copyinstr(args->principal, principal, sizeof (principal),
396 NULL);
397 if (error)
398 return (error);
399 #endif
400
401 /*
402 * Only the first nfsd actually does any work. The RPC code
403 * adds threads to it as needed. Any extra processes offered
404 * by nfsd just exit. If nfsd is new enough, it will call us
405 * once with a structure that specifies how many threads to
406 * use.
407 */
408 NFSD_LOCK();
409 if (newnfs_numnfsd == 0) {
410 newnfs_numnfsd++;
411
412 NFSD_UNLOCK();
413
414 #ifdef KGSSAPI
415 /* An empty string implies AUTH_SYS only. */
416 if (principal[0] != '\0') {
417 ret2 = rpc_gss_set_svc_name(principal, "kerberosv5",
418 GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
419 ret3 = rpc_gss_set_svc_name(principal, "kerberosv5",
420 GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
421 ret4 = rpc_gss_set_svc_name(principal, "kerberosv5",
422 GSS_C_INDEFINITE, NFS_PROG, NFS_VER4);
423
424 if (!ret2 || !ret3 || !ret4) {
425 NFSD_LOCK();
426 newnfs_numnfsd--;
427 nfsrvd_init(1);
428 NFSD_UNLOCK();
429 return (EAUTH);
430 }
431 }
432 #endif
433
434 nfsrvd_pool->sp_minthreads = args->minthreads;
435 nfsrvd_pool->sp_maxthreads = args->maxthreads;
436
437 svc_run(nfsrvd_pool);
438
439 #ifdef KGSSAPI
440 if (principal[0] != '\0') {
441 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER2);
442 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER3);
443 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER4);
444 }
445 #endif
446
447 NFSD_LOCK();
448 newnfs_numnfsd--;
449 nfsrvd_init(1);
450 }
451 NFSD_UNLOCK();
452
453 return (0);
454 }
455
456 /*
457 * Initialize the data structures for the server.
458 * Handshake with any new nfsds starting up to avoid any chance of
459 * corruption.
460 */
461 void
462 nfsrvd_init(int terminating)
463 {
464
465 NFSD_LOCK_ASSERT();
466
467 if (terminating) {
468 NFSD_UNLOCK();
469 svcpool_destroy(nfsrvd_pool);
470 nfsrvd_pool = NULL;
471 NFSD_LOCK();
472 }
473
474 NFSD_UNLOCK();
475
476 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_newnfs));
477 nfsrvd_pool->sp_rcache = NULL;
478 nfsrvd_pool->sp_assign = NULL;
479 nfsrvd_pool->sp_done = NULL;
480
481 NFSD_LOCK();
482 }
483
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