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("$FreeBSD$");
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 <nfs/nfs_fha.h>
46 #include <fs/nfsserver/nfs_fha_new.h>
47
48 #include <security/mac/mac_framework.h>
49
50 NFSDLOCKMUTEX;
51 NFSV4ROOTLOCKMUTEX;
52 struct nfsv4lock nfsd_suspend_lock;
53
54 /*
55 * Mapping of old NFS Version 2 RPC numbers to generic numbers.
56 */
57 int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
58 NFSPROC_NULL,
59 NFSPROC_GETATTR,
60 NFSPROC_SETATTR,
61 NFSPROC_NOOP,
62 NFSPROC_LOOKUP,
63 NFSPROC_READLINK,
64 NFSPROC_READ,
65 NFSPROC_NOOP,
66 NFSPROC_WRITE,
67 NFSPROC_CREATE,
68 NFSPROC_REMOVE,
69 NFSPROC_RENAME,
70 NFSPROC_LINK,
71 NFSPROC_SYMLINK,
72 NFSPROC_MKDIR,
73 NFSPROC_RMDIR,
74 NFSPROC_READDIR,
75 NFSPROC_FSSTAT,
76 NFSPROC_NOOP,
77 NFSPROC_NOOP,
78 NFSPROC_NOOP,
79 NFSPROC_NOOP,
80 };
81
82
83 SYSCTL_DECL(_vfs_nfsd);
84
85 SVCPOOL *nfsrvd_pool;
86
87 static int nfs_privport = 0;
88 SYSCTL_INT(_vfs_nfsd, OID_AUTO, nfs_privport, CTLFLAG_RWTUN,
89 &nfs_privport, 0,
90 "Only allow clients using a privileged port for NFSv2, 3 and 4");
91
92 static int nfs_minvers = NFS_VER2;
93 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers, CTLFLAG_RWTUN,
94 &nfs_minvers, 0, "The lowest version of NFS handled by the server");
95
96 static int nfs_maxvers = NFS_VER4;
97 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_max_nfsvers, CTLFLAG_RWTUN,
98 &nfs_maxvers, 0, "The highest version of NFS handled by the server");
99
100 static int nfs_proc(struct nfsrv_descript *, u_int32_t, SVCXPRT *xprt,
101 struct nfsrvcache **);
102
103 extern u_long sb_max_adj;
104 extern int newnfs_numnfsd;
105 extern struct proc *nfsd_master_proc;
106
107 /*
108 * NFS server system calls
109 */
110
111 static void
112 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
113 {
114 struct nfsrv_descript nd;
115 struct nfsrvcache *rp = NULL;
116 int cacherep, credflavor;
117
118 memset(&nd, 0, sizeof(nd));
119 if (rqst->rq_vers == NFS_VER2) {
120 if (rqst->rq_proc > NFSV2PROC_STATFS ||
121 newnfs_nfsv3_procid[rqst->rq_proc] == NFSPROC_NOOP) {
122 svcerr_noproc(rqst);
123 svc_freereq(rqst);
124 goto out;
125 }
126 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
127 nd.nd_flag = ND_NFSV2;
128 } else if (rqst->rq_vers == NFS_VER3) {
129 if (rqst->rq_proc >= NFS_V3NPROCS) {
130 svcerr_noproc(rqst);
131 svc_freereq(rqst);
132 goto out;
133 }
134 nd.nd_procnum = rqst->rq_proc;
135 nd.nd_flag = ND_NFSV3;
136 } else {
137 if (rqst->rq_proc != NFSPROC_NULL &&
138 rqst->rq_proc != NFSV4PROC_COMPOUND) {
139 svcerr_noproc(rqst);
140 svc_freereq(rqst);
141 goto out;
142 }
143 nd.nd_procnum = rqst->rq_proc;
144 nd.nd_flag = ND_NFSV4;
145 }
146
147 /*
148 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
149 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
150 * mounts.
151 */
152 nd.nd_mrep = rqst->rq_args;
153 rqst->rq_args = NULL;
154 newnfs_realign(&nd.nd_mrep, M_WAITOK);
155 nd.nd_md = nd.nd_mrep;
156 nd.nd_dpos = mtod(nd.nd_md, caddr_t);
157 nd.nd_nam = svc_getrpccaller(rqst);
158 nd.nd_nam2 = rqst->rq_addr;
159 nd.nd_mreq = NULL;
160 nd.nd_cred = NULL;
161
162 if (nfs_privport != 0) {
163 /* Check if source port is privileged */
164 u_short port;
165 struct sockaddr *nam = nd.nd_nam;
166 struct sockaddr_in *sin;
167
168 sin = (struct sockaddr_in *)nam;
169 /*
170 * INET/INET6 - same code:
171 * sin_port and sin6_port are at same offset
172 */
173 port = ntohs(sin->sin_port);
174 if (port >= IPPORT_RESERVED &&
175 nd.nd_procnum != NFSPROC_NULL) {
176 #ifdef INET6
177 char buf[INET6_ADDRSTRLEN];
178 #else
179 char buf[INET_ADDRSTRLEN];
180 #endif
181 #ifdef INET6
182 #if defined(KLD_MODULE)
183 /* Do not use ip6_sprintf: the nfs module should work without INET6. */
184 #define ip6_sprintf(buf, a) \
185 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
186 (a)->s6_addr16[0], (a)->s6_addr16[1], \
187 (a)->s6_addr16[2], (a)->s6_addr16[3], \
188 (a)->s6_addr16[4], (a)->s6_addr16[5], \
189 (a)->s6_addr16[6], (a)->s6_addr16[7]), \
190 (buf))
191 #endif
192 #endif
193 printf("NFS request from unprivileged port (%s:%d)\n",
194 #ifdef INET6
195 sin->sin_family == AF_INET6 ?
196 ip6_sprintf(buf, &satosin6(sin)->sin6_addr) :
197 #if defined(KLD_MODULE)
198 #undef ip6_sprintf
199 #endif
200 #endif
201 inet_ntoa_r(sin->sin_addr, buf), port);
202 svcerr_weakauth(rqst);
203 svc_freereq(rqst);
204 m_freem(nd.nd_mrep);
205 goto out;
206 }
207 }
208
209 if (nd.nd_procnum != NFSPROC_NULL) {
210 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
211 svcerr_weakauth(rqst);
212 svc_freereq(rqst);
213 m_freem(nd.nd_mrep);
214 goto out;
215 }
216
217 /* Set the flag based on credflavor */
218 if (credflavor == RPCSEC_GSS_KRB5) {
219 nd.nd_flag |= ND_GSS;
220 } else if (credflavor == RPCSEC_GSS_KRB5I) {
221 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
222 } else if (credflavor == RPCSEC_GSS_KRB5P) {
223 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
224 } else if (credflavor != AUTH_SYS) {
225 svcerr_weakauth(rqst);
226 svc_freereq(rqst);
227 m_freem(nd.nd_mrep);
228 goto out;
229 }
230
231 #ifdef MAC
232 mac_cred_associate_nfsd(nd.nd_cred);
233 #endif
234 /*
235 * Get a refcnt (shared lock) on nfsd_suspend_lock.
236 * NFSSVC_SUSPENDNFSD will take an exclusive lock on
237 * nfsd_suspend_lock to suspend these threads.
238 * The call to nfsv4_lock() that precedes nfsv4_getref()
239 * ensures that the acquisition of the exclusive lock
240 * takes priority over acquisition of the shared lock by
241 * waiting for any exclusive lock request to complete.
242 * This must be done here, before the check of
243 * nfsv4root exports by nfsvno_v4rootexport().
244 */
245 NFSLOCKV4ROOTMUTEX();
246 nfsv4_lock(&nfsd_suspend_lock, 0, NULL, NFSV4ROOTLOCKMUTEXPTR,
247 NULL);
248 nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR,
249 NULL);
250 NFSUNLOCKV4ROOTMUTEX();
251
252 if ((nd.nd_flag & ND_NFSV4) != 0) {
253 nd.nd_repstat = nfsvno_v4rootexport(&nd);
254 if (nd.nd_repstat != 0) {
255 NFSLOCKV4ROOTMUTEX();
256 nfsv4_relref(&nfsd_suspend_lock);
257 NFSUNLOCKV4ROOTMUTEX();
258 svcerr_weakauth(rqst);
259 svc_freereq(rqst);
260 m_freem(nd.nd_mrep);
261 goto out;
262 }
263 }
264
265 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp);
266 NFSLOCKV4ROOTMUTEX();
267 nfsv4_relref(&nfsd_suspend_lock);
268 NFSUNLOCKV4ROOTMUTEX();
269 } else {
270 NFSMGET(nd.nd_mreq);
271 nd.nd_mreq->m_len = 0;
272 cacherep = RC_REPLY;
273 }
274 if (nd.nd_mrep != NULL)
275 m_freem(nd.nd_mrep);
276
277 if (nd.nd_cred != NULL)
278 crfree(nd.nd_cred);
279
280 if (cacherep == RC_DROPIT) {
281 if (nd.nd_mreq != NULL)
282 m_freem(nd.nd_mreq);
283 svc_freereq(rqst);
284 goto out;
285 }
286
287 if (nd.nd_mreq == NULL) {
288 svcerr_decode(rqst);
289 svc_freereq(rqst);
290 goto out;
291 }
292
293 if (nd.nd_repstat & NFSERR_AUTHERR) {
294 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
295 if (nd.nd_mreq != NULL)
296 m_freem(nd.nd_mreq);
297 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
298 svcerr_systemerr(rqst);
299 }
300 if (rp != NULL) {
301 nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 ||
302 SVC_ACK(xprt, NULL)), rqst->rq_reply_seq);
303 }
304 svc_freereq(rqst);
305
306 out:
307 td_softdep_cleanup(curthread);
308 NFSEXITCODE(0);
309 }
310
311 /*
312 * Check the cache and, optionally, do the RPC.
313 * Return the appropriate cache response.
314 */
315 static int
316 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt,
317 struct nfsrvcache **rpp)
318 {
319 struct thread *td = curthread;
320 int cacherep = RC_DOIT, isdgram, taglen = -1;
321 struct mbuf *m;
322 u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL;
323 u_int32_t minorvers = 0;
324 uint32_t ack;
325
326 *rpp = NULL;
327 if (nd->nd_nam2 == NULL) {
328 nd->nd_flag |= ND_STREAMSOCK;
329 isdgram = 0;
330 } else {
331 isdgram = 1;
332 }
333
334 /*
335 * Two cases:
336 * 1 - For NFSv2 over UDP, if we are near our malloc/mget
337 * limit, just drop the request. There is no
338 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
339 * client will timeout/retry over UDP in a little while.
340 * 2 - nd_repstat == 0 && nd_mreq == NULL, which
341 * means a normal nfs rpc, so check the cache
342 */
343 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
344 nfsrv_mallocmget_limit()) {
345 cacherep = RC_DROPIT;
346 } else {
347 /*
348 * For NFSv3, play it safe and assume that the client is
349 * doing retries on the same TCP connection.
350 */
351 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
352 ND_STREAMSOCK)
353 nd->nd_flag |= ND_SAMETCPCONN;
354 nd->nd_retxid = xid;
355 nd->nd_tcpconntime = NFSD_MONOSEC;
356 nd->nd_sockref = xprt->xp_sockref;
357 if ((nd->nd_flag & ND_NFSV4) != 0)
358 nfsd_getminorvers(nd, tag, &tagstr, &taglen,
359 &minorvers);
360 if ((nd->nd_flag & ND_NFSV41) != 0)
361 /* NFSv4.1 caches replies in the session slots. */
362 cacherep = RC_DOIT;
363 else {
364 cacherep = nfsrvd_getcache(nd);
365 ack = 0;
366 SVC_ACK(xprt, &ack);
367 nfsrc_trimcache(xprt->xp_sockref, ack, 0);
368 }
369 }
370
371 /*
372 * Handle the request. There are three cases.
373 * RC_DOIT - do the RPC
374 * RC_REPLY - return the reply already created
375 * RC_DROPIT - just throw the request away
376 */
377 if (cacherep == RC_DOIT) {
378 if ((nd->nd_flag & ND_NFSV41) != 0)
379 nd->nd_xprt = xprt;
380 nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers, td);
381 if ((nd->nd_flag & ND_NFSV41) != 0) {
382 if (nd->nd_repstat != NFSERR_REPLYFROMCACHE &&
383 (nd->nd_flag & ND_SAVEREPLY) != 0) {
384 /* Cache a copy of the reply. */
385 m = m_copym(nd->nd_mreq, 0, M_COPYALL,
386 M_WAITOK);
387 } else
388 m = NULL;
389 if ((nd->nd_flag & ND_HASSEQUENCE) != 0)
390 nfsrv_cache_session(nd, &m);
391 if (nd->nd_repstat == NFSERR_REPLYFROMCACHE) {
392 nd->nd_repstat = 0;
393 if (m != NULL) {
394 m_freem(nd->nd_mreq);
395 nd->nd_mreq = m;
396 }
397 }
398 cacherep = RC_REPLY;
399 } else {
400 if (nd->nd_repstat == NFSERR_DONTREPLY)
401 cacherep = RC_DROPIT;
402 else
403 cacherep = RC_REPLY;
404 *rpp = nfsrvd_updatecache(nd);
405 }
406 }
407 if (tagstr != NULL && taglen > NFSV4_SMALLSTR)
408 free(tagstr, M_TEMP);
409
410 NFSEXITCODE2(0, nd);
411 return (cacherep);
412 }
413
414 static void
415 nfssvc_loss(SVCXPRT *xprt)
416 {
417 uint32_t ack;
418
419 ack = 0;
420 SVC_ACK(xprt, &ack);
421 nfsrc_trimcache(xprt->xp_sockref, ack, 1);
422 }
423
424 /*
425 * Adds a socket to the list for servicing by nfsds.
426 */
427 int
428 nfsrvd_addsock(struct file *fp)
429 {
430 int siz;
431 struct socket *so;
432 int error = 0;
433 SVCXPRT *xprt;
434 static u_int64_t sockref = 0;
435
436 so = fp->f_data;
437
438 siz = sb_max_adj;
439 error = soreserve(so, siz, siz);
440 if (error)
441 goto out;
442
443 /*
444 * Steal the socket from userland so that it doesn't close
445 * unexpectedly.
446 */
447 if (so->so_type == SOCK_DGRAM)
448 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
449 else
450 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
451 if (xprt) {
452 fp->f_ops = &badfileops;
453 fp->f_data = NULL;
454 xprt->xp_sockref = ++sockref;
455 if (nfs_minvers == NFS_VER2)
456 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
457 NULL);
458 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
459 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
460 NULL);
461 if (nfs_maxvers >= NFS_VER4)
462 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
463 NULL);
464 if (so->so_type == SOCK_STREAM)
465 svc_loss_reg(xprt, nfssvc_loss);
466 SVC_RELEASE(xprt);
467 }
468
469 out:
470 NFSEXITCODE(error);
471 return (error);
472 }
473
474 /*
475 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
476 * until it is killed by a signal.
477 */
478 int
479 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
480 {
481 char principal[MAXHOSTNAMELEN + 5];
482 struct proc *p;
483 int error = 0;
484 bool_t ret2, ret3, ret4;
485
486 error = copyinstr(args->principal, principal, sizeof (principal),
487 NULL);
488 if (error)
489 goto out;
490
491 /*
492 * Only the first nfsd actually does any work. The RPC code
493 * adds threads to it as needed. Any extra processes offered
494 * by nfsd just exit. If nfsd is new enough, it will call us
495 * once with a structure that specifies how many threads to
496 * use.
497 */
498 NFSD_LOCK();
499 if (newnfs_numnfsd == 0) {
500 p = td->td_proc;
501 PROC_LOCK(p);
502 p->p_flag2 |= P2_AST_SU;
503 PROC_UNLOCK(p);
504 newnfs_numnfsd++;
505
506 NFSD_UNLOCK();
507
508 /* An empty string implies AUTH_SYS only. */
509 if (principal[0] != '\0') {
510 ret2 = rpc_gss_set_svc_name_call(principal,
511 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
512 ret3 = rpc_gss_set_svc_name_call(principal,
513 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
514 ret4 = rpc_gss_set_svc_name_call(principal,
515 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER4);
516
517 if (!ret2 || !ret3 || !ret4)
518 printf("nfsd: can't register svc name\n");
519 }
520
521 nfsrvd_pool->sp_minthreads = args->minthreads;
522 nfsrvd_pool->sp_maxthreads = args->maxthreads;
523
524 svc_run(nfsrvd_pool);
525
526 if (principal[0] != '\0') {
527 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
528 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
529 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4);
530 }
531
532 NFSD_LOCK();
533 newnfs_numnfsd--;
534 nfsrvd_init(1);
535 PROC_LOCK(p);
536 p->p_flag2 &= ~P2_AST_SU;
537 PROC_UNLOCK(p);
538 }
539 NFSD_UNLOCK();
540
541 out:
542 NFSEXITCODE(error);
543 return (error);
544 }
545
546 /*
547 * Initialize the data structures for the server.
548 * Handshake with any new nfsds starting up to avoid any chance of
549 * corruption.
550 */
551 void
552 nfsrvd_init(int terminating)
553 {
554
555 NFSD_LOCK_ASSERT();
556
557 if (terminating) {
558 nfsd_master_proc = NULL;
559 NFSD_UNLOCK();
560 nfsrv_freeallbackchannel_xprts();
561 svcpool_close(nfsrvd_pool);
562 NFSD_LOCK();
563 } else {
564 NFSD_UNLOCK();
565 nfsrvd_pool = svcpool_create("nfsd",
566 SYSCTL_STATIC_CHILDREN(_vfs_nfsd));
567 nfsrvd_pool->sp_rcache = NULL;
568 nfsrvd_pool->sp_assign = fhanew_assign;
569 nfsrvd_pool->sp_done = fha_nd_complete;
570 NFSD_LOCK();
571 }
572 }
573
Cache object: 1e3556d455ebd9f049bbe35cce31e6d0
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