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 <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 extern struct proc *nfsd_master_proc;
101
102 /*
103 * NFS server system calls
104 */
105
106 static void
107 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
108 {
109 struct nfsrv_descript nd;
110 struct nfsrvcache *rp = NULL;
111 int cacherep, credflavor;
112
113 memset(&nd, 0, sizeof(nd));
114 if (rqst->rq_vers == NFS_VER2) {
115 if (rqst->rq_proc > NFSV2PROC_STATFS) {
116 svcerr_noproc(rqst);
117 svc_freereq(rqst);
118 goto out;
119 }
120 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
121 nd.nd_flag = ND_NFSV2;
122 } else if (rqst->rq_vers == NFS_VER3) {
123 if (rqst->rq_proc >= NFS_V3NPROCS) {
124 svcerr_noproc(rqst);
125 svc_freereq(rqst);
126 goto out;
127 }
128 nd.nd_procnum = rqst->rq_proc;
129 nd.nd_flag = ND_NFSV3;
130 } else {
131 if (rqst->rq_proc != NFSPROC_NULL &&
132 rqst->rq_proc != NFSV4PROC_COMPOUND) {
133 svcerr_noproc(rqst);
134 svc_freereq(rqst);
135 goto out;
136 }
137 nd.nd_procnum = rqst->rq_proc;
138 nd.nd_flag = ND_NFSV4;
139 }
140
141 /*
142 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
143 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
144 * mounts.
145 */
146 nd.nd_mrep = rqst->rq_args;
147 rqst->rq_args = NULL;
148 newnfs_realign(&nd.nd_mrep);
149 nd.nd_md = nd.nd_mrep;
150 nd.nd_dpos = mtod(nd.nd_md, caddr_t);
151 nd.nd_nam = svc_getrpccaller(rqst);
152 nd.nd_nam2 = rqst->rq_addr;
153 nd.nd_mreq = NULL;
154 nd.nd_cred = NULL;
155
156 if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) {
157 /* Check if source port is privileged */
158 u_short port;
159 struct sockaddr *nam = nd.nd_nam;
160 struct sockaddr_in *sin;
161
162 sin = (struct sockaddr_in *)nam;
163 /*
164 * INET/INET6 - same code:
165 * sin_port and sin6_port are at same offset
166 */
167 port = ntohs(sin->sin_port);
168 if (port >= IPPORT_RESERVED &&
169 nd.nd_procnum != NFSPROC_NULL) {
170 #ifdef INET6
171 char b6[INET6_ADDRSTRLEN];
172 #if defined(KLD_MODULE)
173 /* Do not use ip6_sprintf: the nfs module should work without INET6. */
174 #define ip6_sprintf(buf, a) \
175 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
176 (a)->s6_addr16[0], (a)->s6_addr16[1], \
177 (a)->s6_addr16[2], (a)->s6_addr16[3], \
178 (a)->s6_addr16[4], (a)->s6_addr16[5], \
179 (a)->s6_addr16[6], (a)->s6_addr16[7]), \
180 (buf))
181 #endif
182 #endif
183 printf("NFS request from unprivileged port (%s:%d)\n",
184 #ifdef INET6
185 sin->sin_family == AF_INET6 ?
186 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
187 #if defined(KLD_MODULE)
188 #undef ip6_sprintf
189 #endif
190 #endif
191 inet_ntoa(sin->sin_addr), port);
192 svcerr_weakauth(rqst);
193 svc_freereq(rqst);
194 m_freem(nd.nd_mrep);
195 goto out;
196 }
197 }
198
199 if (nd.nd_procnum != NFSPROC_NULL) {
200 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
201 svcerr_weakauth(rqst);
202 svc_freereq(rqst);
203 m_freem(nd.nd_mrep);
204 goto out;
205 }
206
207 /* Set the flag based on credflavor */
208 if (credflavor == RPCSEC_GSS_KRB5) {
209 nd.nd_flag |= ND_GSS;
210 } else if (credflavor == RPCSEC_GSS_KRB5I) {
211 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
212 } else if (credflavor == RPCSEC_GSS_KRB5P) {
213 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
214 } else if (credflavor != AUTH_SYS) {
215 svcerr_weakauth(rqst);
216 svc_freereq(rqst);
217 m_freem(nd.nd_mrep);
218 goto out;
219 }
220
221 #ifdef MAC
222 mac_cred_associate_nfsd(nd.nd_cred);
223 #endif
224 if ((nd.nd_flag & ND_NFSV4) != 0) {
225 nd.nd_repstat = nfsvno_v4rootexport(&nd);
226 if (nd.nd_repstat != 0) {
227 svcerr_weakauth(rqst);
228 svc_freereq(rqst);
229 m_freem(nd.nd_mrep);
230 goto out;
231 }
232 }
233
234 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt->xp_socket,
235 xprt->xp_sockref, &rp);
236 } else {
237 NFSMGET(nd.nd_mreq);
238 nd.nd_mreq->m_len = 0;
239 cacherep = RC_REPLY;
240 }
241 if (nd.nd_mrep != NULL)
242 m_freem(nd.nd_mrep);
243
244 if (nd.nd_cred != NULL)
245 crfree(nd.nd_cred);
246
247 if (cacherep == RC_DROPIT) {
248 if (nd.nd_mreq != NULL)
249 m_freem(nd.nd_mreq);
250 svc_freereq(rqst);
251 goto out;
252 }
253
254 if (nd.nd_mreq == NULL) {
255 svcerr_decode(rqst);
256 svc_freereq(rqst);
257 goto out;
258 }
259
260 if (nd.nd_repstat & NFSERR_AUTHERR) {
261 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
262 if (nd.nd_mreq != NULL)
263 m_freem(nd.nd_mreq);
264 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
265 svcerr_systemerr(rqst);
266 }
267 if (rp != NULL)
268 nfsrvd_sentcache(rp, xprt->xp_socket, 0);
269 svc_freereq(rqst);
270
271 out:
272 NFSEXITCODE(0);
273 }
274
275 /*
276 * Check the cache and, optionally, do the RPC.
277 * Return the appropriate cache response.
278 */
279 static int
280 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, struct socket *so,
281 u_int64_t sockref, struct nfsrvcache **rpp)
282 {
283 struct thread *td = curthread;
284 int cacherep = RC_DOIT, isdgram;
285
286 *rpp = NULL;
287 if (nd->nd_nam2 == NULL) {
288 nd->nd_flag |= ND_STREAMSOCK;
289 isdgram = 0;
290 } else {
291 isdgram = 1;
292 }
293
294 /*
295 * Two cases:
296 * 1 - For NFSv2 over UDP, if we are near our malloc/mget
297 * limit, just drop the request. There is no
298 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
299 * client will timeout/retry over UDP in a little while.
300 * 2 - nd_repstat == 0 && nd_mreq == NULL, which
301 * means a normal nfs rpc, so check the cache
302 */
303 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
304 nfsrv_mallocmget_limit()) {
305 cacherep = RC_DROPIT;
306 } else {
307 /*
308 * For NFSv3, play it safe and assume that the client is
309 * doing retries on the same TCP connection.
310 */
311 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
312 ND_STREAMSOCK)
313 nd->nd_flag |= ND_SAMETCPCONN;
314 nd->nd_retxid = xid;
315 nd->nd_tcpconntime = NFSD_MONOSEC;
316 nd->nd_sockref = sockref;
317 cacherep = nfsrvd_getcache(nd, so);
318 }
319
320 /*
321 * Handle the request. There are three cases.
322 * RC_DOIT - do the RPC
323 * RC_REPLY - return the reply already created
324 * RC_DROPIT - just throw the request away
325 */
326 if (cacherep == RC_DOIT) {
327 nfsrvd_dorpc(nd, isdgram, td);
328 if (nd->nd_repstat == NFSERR_DONTREPLY)
329 cacherep = RC_DROPIT;
330 else
331 cacherep = RC_REPLY;
332 *rpp = nfsrvd_updatecache(nd, so);
333 }
334
335 NFSEXITCODE2(0, nd);
336 return (cacherep);
337 }
338
339 /*
340 * Adds a socket to the list for servicing by nfsds.
341 */
342 int
343 nfsrvd_addsock(struct file *fp)
344 {
345 int siz;
346 struct socket *so;
347 int error = 0;
348 SVCXPRT *xprt;
349 static u_int64_t sockref = 0;
350
351 so = fp->f_data;
352
353 siz = sb_max_adj;
354 error = soreserve(so, siz, siz);
355 if (error)
356 goto out;
357
358 /*
359 * Steal the socket from userland so that it doesn't close
360 * unexpectedly.
361 */
362 if (so->so_type == SOCK_DGRAM)
363 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
364 else
365 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
366 if (xprt) {
367 fp->f_ops = &badfileops;
368 fp->f_data = NULL;
369 xprt->xp_sockref = ++sockref;
370 if (nfs_minvers == NFS_VER2)
371 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
372 NULL);
373 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
374 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
375 NULL);
376 if (nfs_maxvers >= NFS_VER4)
377 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
378 NULL);
379 SVC_RELEASE(xprt);
380 }
381
382 out:
383 NFSEXITCODE(error);
384 return (error);
385 }
386
387 /*
388 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
389 * until it is killed by a signal.
390 */
391 int
392 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
393 {
394 char principal[MAXHOSTNAMELEN + 5];
395 int error = 0;
396 bool_t ret2, ret3, ret4;
397
398 error = copyinstr(args->principal, principal, sizeof (principal),
399 NULL);
400 if (error)
401 goto out;
402
403 /*
404 * Only the first nfsd actually does any work. The RPC code
405 * adds threads to it as needed. Any extra processes offered
406 * by nfsd just exit. If nfsd is new enough, it will call us
407 * once with a structure that specifies how many threads to
408 * use.
409 */
410 NFSD_LOCK();
411 if (newnfs_numnfsd == 0) {
412 newnfs_numnfsd++;
413
414 NFSD_UNLOCK();
415
416 /* An empty string implies AUTH_SYS only. */
417 if (principal[0] != '\0') {
418 ret2 = rpc_gss_set_svc_name_call(principal,
419 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
420 ret3 = rpc_gss_set_svc_name_call(principal,
421 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
422 ret4 = rpc_gss_set_svc_name_call(principal,
423 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER4);
424
425 if (!ret2 || !ret3 || !ret4)
426 printf("nfsd: can't register svc name\n");
427 }
428
429 nfsrvd_pool->sp_minthreads = args->minthreads;
430 nfsrvd_pool->sp_maxthreads = args->maxthreads;
431
432 svc_run(nfsrvd_pool);
433
434 if (principal[0] != '\0') {
435 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
436 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
437 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4);
438 }
439
440 NFSD_LOCK();
441 newnfs_numnfsd--;
442 nfsrvd_init(1);
443 }
444 NFSD_UNLOCK();
445
446 out:
447 NFSEXITCODE(error);
448 return (error);
449 }
450
451 /*
452 * Initialize the data structures for the server.
453 * Handshake with any new nfsds starting up to avoid any chance of
454 * corruption.
455 */
456 void
457 nfsrvd_init(int terminating)
458 {
459
460 NFSD_LOCK_ASSERT();
461
462 if (terminating) {
463 nfsd_master_proc = NULL;
464 NFSD_UNLOCK();
465 svcpool_destroy(nfsrvd_pool);
466 nfsrvd_pool = NULL;
467 NFSD_LOCK();
468 }
469
470 NFSD_UNLOCK();
471
472 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_newnfs));
473 nfsrvd_pool->sp_rcache = NULL;
474 nfsrvd_pool->sp_assign = NULL;
475 nfsrvd_pool->sp_done = NULL;
476
477 NFSD_LOCK();
478 }
479
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