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_RW, 89 &nfs_privport, 0, 90 "Only allow clients using a privileged port for NFSv2 and 3"); 91 92 static int nfs_minvers = NFS_VER2; 93 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers, CTLFLAG_RW, 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_RW, 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 svcerr_noproc(rqst); 122 svc_freereq(rqst); 123 goto out; 124 } 125 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc]; 126 nd.nd_flag = ND_NFSV2; 127 } else if (rqst->rq_vers == NFS_VER3) { 128 if (rqst->rq_proc >= NFS_V3NPROCS) { 129 svcerr_noproc(rqst); 130 svc_freereq(rqst); 131 goto out; 132 } 133 nd.nd_procnum = rqst->rq_proc; 134 nd.nd_flag = ND_NFSV3; 135 } else { 136 if (rqst->rq_proc != NFSPROC_NULL && 137 rqst->rq_proc != NFSV4PROC_COMPOUND) { 138 svcerr_noproc(rqst); 139 svc_freereq(rqst); 140 goto out; 141 } 142 nd.nd_procnum = rqst->rq_proc; 143 nd.nd_flag = ND_NFSV4; 144 } 145 146 /* 147 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 - 148 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP 149 * mounts. 150 */ 151 nd.nd_mrep = rqst->rq_args; 152 rqst->rq_args = NULL; 153 newnfs_realign(&nd.nd_mrep, M_WAITOK); 154 nd.nd_md = nd.nd_mrep; 155 nd.nd_dpos = mtod(nd.nd_md, caddr_t); 156 nd.nd_nam = svc_getrpccaller(rqst); 157 nd.nd_nam2 = rqst->rq_addr; 158 nd.nd_mreq = NULL; 159 nd.nd_cred = NULL; 160 161 if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) { 162 /* Check if source port is privileged */ 163 u_short port; 164 struct sockaddr *nam = nd.nd_nam; 165 struct sockaddr_in *sin; 166 167 sin = (struct sockaddr_in *)nam; 168 /* 169 * INET/INET6 - same code: 170 * sin_port and sin6_port are at same offset 171 */ 172 port = ntohs(sin->sin_port); 173 if (port >= IPPORT_RESERVED && 174 nd.nd_procnum != NFSPROC_NULL) { 175 #ifdef INET6 176 char b6[INET6_ADDRSTRLEN]; 177 #if defined(KLD_MODULE) 178 /* Do not use ip6_sprintf: the nfs module should work without INET6. */ 179 #define ip6_sprintf(buf, a) \ 180 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \ 181 (a)->s6_addr16[0], (a)->s6_addr16[1], \ 182 (a)->s6_addr16[2], (a)->s6_addr16[3], \ 183 (a)->s6_addr16[4], (a)->s6_addr16[5], \ 184 (a)->s6_addr16[6], (a)->s6_addr16[7]), \ 185 (buf)) 186 #endif 187 #endif 188 printf("NFS request from unprivileged port (%s:%d)\n", 189 #ifdef INET6 190 sin->sin_family == AF_INET6 ? 191 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) : 192 #if defined(KLD_MODULE) 193 #undef ip6_sprintf 194 #endif 195 #endif 196 inet_ntoa(sin->sin_addr), port); 197 svcerr_weakauth(rqst); 198 svc_freereq(rqst); 199 m_freem(nd.nd_mrep); 200 goto out; 201 } 202 } 203 204 if (nd.nd_procnum != NFSPROC_NULL) { 205 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) { 206 svcerr_weakauth(rqst); 207 svc_freereq(rqst); 208 m_freem(nd.nd_mrep); 209 goto out; 210 } 211 212 /* Set the flag based on credflavor */ 213 if (credflavor == RPCSEC_GSS_KRB5) { 214 nd.nd_flag |= ND_GSS; 215 } else if (credflavor == RPCSEC_GSS_KRB5I) { 216 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY); 217 } else if (credflavor == RPCSEC_GSS_KRB5P) { 218 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY); 219 } else if (credflavor != AUTH_SYS) { 220 svcerr_weakauth(rqst); 221 svc_freereq(rqst); 222 m_freem(nd.nd_mrep); 223 goto out; 224 } 225 226 #ifdef MAC 227 mac_cred_associate_nfsd(nd.nd_cred); 228 #endif 229 /* 230 * Get a refcnt (shared lock) on nfsd_suspend_lock. 231 * NFSSVC_SUSPENDNFSD will take an exclusive lock on 232 * nfsd_suspend_lock to suspend these threads. 233 * This must be done here, before the check of 234 * nfsv4root exports by nfsvno_v4rootexport(). 235 */ 236 NFSLOCKV4ROOTMUTEX(); 237 nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, 238 NULL); 239 NFSUNLOCKV4ROOTMUTEX(); 240 241 if ((nd.nd_flag & ND_NFSV4) != 0) { 242 nd.nd_repstat = nfsvno_v4rootexport(&nd); 243 if (nd.nd_repstat != 0) { 244 NFSLOCKV4ROOTMUTEX(); 245 nfsv4_relref(&nfsd_suspend_lock); 246 NFSUNLOCKV4ROOTMUTEX(); 247 svcerr_weakauth(rqst); 248 svc_freereq(rqst); 249 m_freem(nd.nd_mrep); 250 goto out; 251 } 252 } 253 254 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp); 255 NFSLOCKV4ROOTMUTEX(); 256 nfsv4_relref(&nfsd_suspend_lock); 257 NFSUNLOCKV4ROOTMUTEX(); 258 } else { 259 NFSMGET(nd.nd_mreq); 260 nd.nd_mreq->m_len = 0; 261 cacherep = RC_REPLY; 262 } 263 if (nd.nd_mrep != NULL) 264 m_freem(nd.nd_mrep); 265 266 if (nd.nd_cred != NULL) 267 crfree(nd.nd_cred); 268 269 if (cacherep == RC_DROPIT) { 270 if (nd.nd_mreq != NULL) 271 m_freem(nd.nd_mreq); 272 svc_freereq(rqst); 273 goto out; 274 } 275 276 if (nd.nd_mreq == NULL) { 277 svcerr_decode(rqst); 278 svc_freereq(rqst); 279 goto out; 280 } 281 282 if (nd.nd_repstat & NFSERR_AUTHERR) { 283 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR); 284 if (nd.nd_mreq != NULL) 285 m_freem(nd.nd_mreq); 286 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) { 287 svcerr_systemerr(rqst); 288 } 289 if (rp != NULL) { 290 nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 || 291 SVC_ACK(xprt, NULL)), rqst->rq_reply_seq); 292 } 293 svc_freereq(rqst); 294 295 out: 296 NFSEXITCODE(0); 297 } 298 299 /* 300 * Check the cache and, optionally, do the RPC. 301 * Return the appropriate cache response. 302 */ 303 static int 304 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt, 305 struct nfsrvcache **rpp) 306 { 307 struct thread *td = curthread; 308 int cacherep = RC_DOIT, isdgram, taglen = -1; 309 struct mbuf *m; 310 u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL; 311 u_int32_t minorvers = 0; 312 uint32_t ack; 313 314 *rpp = NULL; 315 if (nd->nd_nam2 == NULL) { 316 nd->nd_flag |= ND_STREAMSOCK; 317 isdgram = 0; 318 } else { 319 isdgram = 1; 320 } 321 322 /* 323 * Two cases: 324 * 1 - For NFSv2 over UDP, if we are near our malloc/mget 325 * limit, just drop the request. There is no 326 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the 327 * client will timeout/retry over UDP in a little while. 328 * 2 - nd_repstat == 0 && nd_mreq == NULL, which 329 * means a normal nfs rpc, so check the cache 330 */ 331 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL && 332 nfsrv_mallocmget_limit()) { 333 cacherep = RC_DROPIT; 334 } else { 335 /* 336 * For NFSv3, play it safe and assume that the client is 337 * doing retries on the same TCP connection. 338 */ 339 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) == 340 ND_STREAMSOCK) 341 nd->nd_flag |= ND_SAMETCPCONN; 342 nd->nd_retxid = xid; 343 nd->nd_tcpconntime = NFSD_MONOSEC; 344 nd->nd_sockref = xprt->xp_sockref; 345 if ((nd->nd_flag & ND_NFSV4) != 0) 346 nfsd_getminorvers(nd, tag, &tagstr, &taglen, 347 &minorvers); 348 if ((nd->nd_flag & ND_NFSV41) != 0) 349 /* NFSv4.1 caches replies in the session slots. */ 350 cacherep = RC_DOIT; 351 else { 352 cacherep = nfsrvd_getcache(nd); 353 ack = 0; 354 SVC_ACK(xprt, &ack); 355 nfsrc_trimcache(xprt->xp_sockref, ack, 0); 356 } 357 } 358 359 /* 360 * Handle the request. There are three cases. 361 * RC_DOIT - do the RPC 362 * RC_REPLY - return the reply already created 363 * RC_DROPIT - just throw the request away 364 */ 365 if (cacherep == RC_DOIT) { 366 if ((nd->nd_flag & ND_NFSV41) != 0) 367 nd->nd_xprt = xprt; 368 nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers, td); 369 if ((nd->nd_flag & ND_NFSV41) != 0) { 370 if (nd->nd_repstat != NFSERR_REPLYFROMCACHE && 371 (nd->nd_flag & ND_SAVEREPLY) != 0) { 372 /* Cache a copy of the reply. */ 373 m = m_copym(nd->nd_mreq, 0, M_COPYALL, 374 M_WAITOK); 375 } else 376 m = NULL; 377 if ((nd->nd_flag & ND_HASSEQUENCE) != 0) 378 nfsrv_cache_session(nd->nd_sessionid, 379 nd->nd_slotid, nd->nd_repstat, &m); 380 if (nd->nd_repstat == NFSERR_REPLYFROMCACHE) 381 nd->nd_repstat = 0; 382 cacherep = RC_REPLY; 383 } else { 384 if (nd->nd_repstat == NFSERR_DONTREPLY) 385 cacherep = RC_DROPIT; 386 else 387 cacherep = RC_REPLY; 388 *rpp = nfsrvd_updatecache(nd); 389 } 390 } 391 if (tagstr != NULL && taglen > NFSV4_SMALLSTR) 392 free(tagstr, M_TEMP); 393 394 NFSEXITCODE2(0, nd); 395 return (cacherep); 396 } 397 398 static void 399 nfssvc_loss(SVCXPRT *xprt) 400 { 401 uint32_t ack; 402 403 ack = 0; 404 SVC_ACK(xprt, &ack); 405 nfsrc_trimcache(xprt->xp_sockref, ack, 1); 406 } 407 408 /* 409 * Adds a socket to the list for servicing by nfsds. 410 */ 411 int 412 nfsrvd_addsock(struct file *fp) 413 { 414 int siz; 415 struct socket *so; 416 int error = 0; 417 SVCXPRT *xprt; 418 static u_int64_t sockref = 0; 419 420 so = fp->f_data; 421 422 siz = sb_max_adj; 423 error = soreserve(so, siz, siz); 424 if (error) 425 goto out; 426 427 /* 428 * Steal the socket from userland so that it doesn't close 429 * unexpectedly. 430 */ 431 if (so->so_type == SOCK_DGRAM) 432 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0); 433 else 434 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0); 435 if (xprt) { 436 fp->f_ops = &badfileops; 437 fp->f_data = NULL; 438 xprt->xp_sockref = ++sockref; 439 if (nfs_minvers == NFS_VER2) 440 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, 441 NULL); 442 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3) 443 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, 444 NULL); 445 if (nfs_maxvers >= NFS_VER4) 446 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program, 447 NULL); 448 if (so->so_type == SOCK_STREAM) 449 svc_loss_reg(xprt, nfssvc_loss); 450 SVC_RELEASE(xprt); 451 } 452 453 out: 454 NFSEXITCODE(error); 455 return (error); 456 } 457 458 /* 459 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 460 * until it is killed by a signal. 461 */ 462 int 463 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args) 464 { 465 char principal[MAXHOSTNAMELEN + 5]; 466 int error = 0; 467 bool_t ret2, ret3, ret4; 468 469 error = copyinstr(args->principal, principal, sizeof (principal), 470 NULL); 471 if (error) 472 goto out; 473 474 /* 475 * Only the first nfsd actually does any work. The RPC code 476 * adds threads to it as needed. Any extra processes offered 477 * by nfsd just exit. If nfsd is new enough, it will call us 478 * once with a structure that specifies how many threads to 479 * use. 480 */ 481 NFSD_LOCK(); 482 if (newnfs_numnfsd == 0) { 483 newnfs_numnfsd++; 484 485 NFSD_UNLOCK(); 486 487 /* An empty string implies AUTH_SYS only. */ 488 if (principal[0] != '\0') { 489 ret2 = rpc_gss_set_svc_name_call(principal, 490 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER2); 491 ret3 = rpc_gss_set_svc_name_call(principal, 492 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER3); 493 ret4 = rpc_gss_set_svc_name_call(principal, 494 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER4); 495 496 if (!ret2 || !ret3 || !ret4) 497 printf("nfsd: can't register svc name\n"); 498 } 499 500 nfsrvd_pool->sp_minthreads = args->minthreads; 501 nfsrvd_pool->sp_maxthreads = args->maxthreads; 502 503 svc_run(nfsrvd_pool); 504 505 if (principal[0] != '\0') { 506 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2); 507 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3); 508 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4); 509 } 510 511 NFSD_LOCK(); 512 newnfs_numnfsd--; 513 nfsrvd_init(1); 514 } 515 NFSD_UNLOCK(); 516 517 out: 518 NFSEXITCODE(error); 519 return (error); 520 } 521 522 /* 523 * Initialize the data structures for the server. 524 * Handshake with any new nfsds starting up to avoid any chance of 525 * corruption. 526 */ 527 void 528 nfsrvd_init(int terminating) 529 { 530 531 NFSD_LOCK_ASSERT(); 532 533 if (terminating) { 534 nfsd_master_proc = NULL; 535 NFSD_UNLOCK(); 536 svcpool_destroy(nfsrvd_pool); 537 nfsrvd_pool = NULL; 538 NFSD_LOCK(); 539 } 540 541 NFSD_UNLOCK(); 542 543 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsd)); 544 nfsrvd_pool->sp_rcache = NULL; 545 nfsrvd_pool->sp_assign = fhanew_assign; 546 nfsrvd_pool->sp_done = fha_nd_complete; 547 548 NFSD_LOCK(); 549 } 550 551