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 and 3"); 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 && (nd.nd_flag & ND_NFSV4) == 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 b6[INET6_ADDRSTRLEN]; 178 #if defined(KLD_MODULE) 179 /* Do not use ip6_sprintf: the nfs module should work without INET6. */ 180 #define ip6_sprintf(buf, a) \ 181 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \ 182 (a)->s6_addr16[0], (a)->s6_addr16[1], \ 183 (a)->s6_addr16[2], (a)->s6_addr16[3], \ 184 (a)->s6_addr16[4], (a)->s6_addr16[5], \ 185 (a)->s6_addr16[6], (a)->s6_addr16[7]), \ 186 (buf)) 187 #endif 188 #endif 189 printf("NFS request from unprivileged port (%s:%d)\n", 190 #ifdef INET6 191 sin->sin_family == AF_INET6 ? 192 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) : 193 #if defined(KLD_MODULE) 194 #undef ip6_sprintf 195 #endif 196 #endif 197 inet_ntoa(sin->sin_addr), port); 198 svcerr_weakauth(rqst); 199 svc_freereq(rqst); 200 m_freem(nd.nd_mrep); 201 goto out; 202 } 203 } 204 205 if (nd.nd_procnum != NFSPROC_NULL) { 206 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) { 207 svcerr_weakauth(rqst); 208 svc_freereq(rqst); 209 m_freem(nd.nd_mrep); 210 goto out; 211 } 212 213 /* Set the flag based on credflavor */ 214 if (credflavor == RPCSEC_GSS_KRB5) { 215 nd.nd_flag |= ND_GSS; 216 } else if (credflavor == RPCSEC_GSS_KRB5I) { 217 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY); 218 } else if (credflavor == RPCSEC_GSS_KRB5P) { 219 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY); 220 } else if (credflavor != AUTH_SYS) { 221 svcerr_weakauth(rqst); 222 svc_freereq(rqst); 223 m_freem(nd.nd_mrep); 224 goto out; 225 } 226 227 #ifdef MAC 228 mac_cred_associate_nfsd(nd.nd_cred); 229 #endif 230 /* 231 * Get a refcnt (shared lock) on nfsd_suspend_lock. 232 * NFSSVC_SUSPENDNFSD will take an exclusive lock on 233 * nfsd_suspend_lock to suspend these threads. 234 * This must be done here, before the check of 235 * nfsv4root exports by nfsvno_v4rootexport(). 236 */ 237 NFSLOCKV4ROOTMUTEX(); 238 nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, 239 NULL); 240 NFSUNLOCKV4ROOTMUTEX(); 241 242 if ((nd.nd_flag & ND_NFSV4) != 0) { 243 nd.nd_repstat = nfsvno_v4rootexport(&nd); 244 if (nd.nd_repstat != 0) { 245 NFSLOCKV4ROOTMUTEX(); 246 nfsv4_relref(&nfsd_suspend_lock); 247 NFSUNLOCKV4ROOTMUTEX(); 248 svcerr_weakauth(rqst); 249 svc_freereq(rqst); 250 m_freem(nd.nd_mrep); 251 goto out; 252 } 253 } 254 255 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp); 256 NFSLOCKV4ROOTMUTEX(); 257 nfsv4_relref(&nfsd_suspend_lock); 258 NFSUNLOCKV4ROOTMUTEX(); 259 } else { 260 NFSMGET(nd.nd_mreq); 261 nd.nd_mreq->m_len = 0; 262 cacherep = RC_REPLY; 263 } 264 if (nd.nd_mrep != NULL) 265 m_freem(nd.nd_mrep); 266 267 if (nd.nd_cred != NULL) 268 crfree(nd.nd_cred); 269 270 if (cacherep == RC_DROPIT) { 271 if (nd.nd_mreq != NULL) 272 m_freem(nd.nd_mreq); 273 svc_freereq(rqst); 274 goto out; 275 } 276 277 if (nd.nd_mreq == NULL) { 278 svcerr_decode(rqst); 279 svc_freereq(rqst); 280 goto out; 281 } 282 283 if (nd.nd_repstat & NFSERR_AUTHERR) { 284 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR); 285 if (nd.nd_mreq != NULL) 286 m_freem(nd.nd_mreq); 287 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) { 288 svcerr_systemerr(rqst); 289 } 290 if (rp != NULL) { 291 nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 || 292 SVC_ACK(xprt, NULL)), rqst->rq_reply_seq); 293 } 294 svc_freereq(rqst); 295 296 out: 297 if (softdep_ast_cleanup != NULL) 298 softdep_ast_cleanup(); 299 NFSEXITCODE(0); 300 } 301 302 /* 303 * Check the cache and, optionally, do the RPC. 304 * Return the appropriate cache response. 305 */ 306 static int 307 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt, 308 struct nfsrvcache **rpp) 309 { 310 struct thread *td = curthread; 311 int cacherep = RC_DOIT, isdgram, taglen = -1; 312 struct mbuf *m; 313 u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL; 314 u_int32_t minorvers = 0; 315 uint32_t ack; 316 317 *rpp = NULL; 318 if (nd->nd_nam2 == NULL) { 319 nd->nd_flag |= ND_STREAMSOCK; 320 isdgram = 0; 321 } else { 322 isdgram = 1; 323 } 324 325 /* 326 * Two cases: 327 * 1 - For NFSv2 over UDP, if we are near our malloc/mget 328 * limit, just drop the request. There is no 329 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the 330 * client will timeout/retry over UDP in a little while. 331 * 2 - nd_repstat == 0 && nd_mreq == NULL, which 332 * means a normal nfs rpc, so check the cache 333 */ 334 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL && 335 nfsrv_mallocmget_limit()) { 336 cacherep = RC_DROPIT; 337 } else { 338 /* 339 * For NFSv3, play it safe and assume that the client is 340 * doing retries on the same TCP connection. 341 */ 342 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) == 343 ND_STREAMSOCK) 344 nd->nd_flag |= ND_SAMETCPCONN; 345 nd->nd_retxid = xid; 346 nd->nd_tcpconntime = NFSD_MONOSEC; 347 nd->nd_sockref = xprt->xp_sockref; 348 if ((nd->nd_flag & ND_NFSV4) != 0) 349 nfsd_getminorvers(nd, tag, &tagstr, &taglen, 350 &minorvers); 351 if ((nd->nd_flag & ND_NFSV41) != 0) 352 /* NFSv4.1 caches replies in the session slots. */ 353 cacherep = RC_DOIT; 354 else { 355 cacherep = nfsrvd_getcache(nd); 356 ack = 0; 357 SVC_ACK(xprt, &ack); 358 nfsrc_trimcache(xprt->xp_sockref, ack, 0); 359 } 360 } 361 362 /* 363 * Handle the request. There are three cases. 364 * RC_DOIT - do the RPC 365 * RC_REPLY - return the reply already created 366 * RC_DROPIT - just throw the request away 367 */ 368 if (cacherep == RC_DOIT) { 369 if ((nd->nd_flag & ND_NFSV41) != 0) 370 nd->nd_xprt = xprt; 371 nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers, td); 372 if ((nd->nd_flag & ND_NFSV41) != 0) { 373 if (nd->nd_repstat != NFSERR_REPLYFROMCACHE && 374 (nd->nd_flag & ND_SAVEREPLY) != 0) { 375 /* Cache a copy of the reply. */ 376 m = m_copym(nd->nd_mreq, 0, M_COPYALL, 377 M_WAITOK); 378 } else 379 m = NULL; 380 if ((nd->nd_flag & ND_HASSEQUENCE) != 0) 381 nfsrv_cache_session(nd->nd_sessionid, 382 nd->nd_slotid, nd->nd_repstat, &m); 383 if (nd->nd_repstat == NFSERR_REPLYFROMCACHE) 384 nd->nd_repstat = 0; 385 cacherep = RC_REPLY; 386 } else { 387 if (nd->nd_repstat == NFSERR_DONTREPLY) 388 cacherep = RC_DROPIT; 389 else 390 cacherep = RC_REPLY; 391 *rpp = nfsrvd_updatecache(nd); 392 } 393 } 394 if (tagstr != NULL && taglen > NFSV4_SMALLSTR) 395 free(tagstr, M_TEMP); 396 397 NFSEXITCODE2(0, nd); 398 return (cacherep); 399 } 400 401 static void 402 nfssvc_loss(SVCXPRT *xprt) 403 { 404 uint32_t ack; 405 406 ack = 0; 407 SVC_ACK(xprt, &ack); 408 nfsrc_trimcache(xprt->xp_sockref, ack, 1); 409 } 410 411 /* 412 * Adds a socket to the list for servicing by nfsds. 413 */ 414 int 415 nfsrvd_addsock(struct file *fp) 416 { 417 int siz; 418 struct socket *so; 419 int error = 0; 420 SVCXPRT *xprt; 421 static u_int64_t sockref = 0; 422 423 so = fp->f_data; 424 425 siz = sb_max_adj; 426 error = soreserve(so, siz, siz); 427 if (error) 428 goto out; 429 430 /* 431 * Steal the socket from userland so that it doesn't close 432 * unexpectedly. 433 */ 434 if (so->so_type == SOCK_DGRAM) 435 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0); 436 else 437 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0); 438 if (xprt) { 439 fp->f_ops = &badfileops; 440 fp->f_data = NULL; 441 xprt->xp_sockref = ++sockref; 442 if (nfs_minvers == NFS_VER2) 443 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, 444 NULL); 445 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3) 446 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, 447 NULL); 448 if (nfs_maxvers >= NFS_VER4) 449 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program, 450 NULL); 451 if (so->so_type == SOCK_STREAM) 452 svc_loss_reg(xprt, nfssvc_loss); 453 SVC_RELEASE(xprt); 454 } 455 456 out: 457 NFSEXITCODE(error); 458 return (error); 459 } 460 461 /* 462 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 463 * until it is killed by a signal. 464 */ 465 int 466 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args) 467 { 468 char principal[MAXHOSTNAMELEN + 5]; 469 struct proc *p; 470 int error = 0; 471 bool_t ret2, ret3, ret4; 472 473 error = copyinstr(args->principal, principal, sizeof (principal), 474 NULL); 475 if (error) 476 goto out; 477 478 /* 479 * Only the first nfsd actually does any work. The RPC code 480 * adds threads to it as needed. Any extra processes offered 481 * by nfsd just exit. If nfsd is new enough, it will call us 482 * once with a structure that specifies how many threads to 483 * use. 484 */ 485 NFSD_LOCK(); 486 if (newnfs_numnfsd == 0) { 487 p = td->td_proc; 488 PROC_LOCK(p); 489 p->p_flag2 |= P2_AST_SU; 490 PROC_UNLOCK(p); 491 newnfs_numnfsd++; 492 493 NFSD_UNLOCK(); 494 495 /* An empty string implies AUTH_SYS only. */ 496 if (principal[0] != '\0') { 497 ret2 = rpc_gss_set_svc_name_call(principal, 498 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER2); 499 ret3 = rpc_gss_set_svc_name_call(principal, 500 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER3); 501 ret4 = rpc_gss_set_svc_name_call(principal, 502 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER4); 503 504 if (!ret2 || !ret3 || !ret4) 505 printf("nfsd: can't register svc name\n"); 506 } 507 508 nfsrvd_pool->sp_minthreads = args->minthreads; 509 nfsrvd_pool->sp_maxthreads = args->maxthreads; 510 511 svc_run(nfsrvd_pool); 512 513 if (principal[0] != '\0') { 514 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2); 515 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3); 516 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4); 517 } 518 519 NFSD_LOCK(); 520 newnfs_numnfsd--; 521 nfsrvd_init(1); 522 PROC_LOCK(p); 523 p->p_flag2 &= ~P2_AST_SU; 524 PROC_UNLOCK(p); 525 } 526 NFSD_UNLOCK(); 527 528 out: 529 NFSEXITCODE(error); 530 return (error); 531 } 532 533 /* 534 * Initialize the data structures for the server. 535 * Handshake with any new nfsds starting up to avoid any chance of 536 * corruption. 537 */ 538 void 539 nfsrvd_init(int terminating) 540 { 541 542 NFSD_LOCK_ASSERT(); 543 544 if (terminating) { 545 nfsd_master_proc = NULL; 546 NFSD_UNLOCK(); 547 svcpool_destroy(nfsrvd_pool); 548 nfsrvd_pool = NULL; 549 NFSD_LOCK(); 550 } 551 552 NFSD_UNLOCK(); 553 554 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsd)); 555 nfsrvd_pool->sp_rcache = NULL; 556 nfsrvd_pool->sp_assign = fhanew_assign; 557 nfsrvd_pool->sp_done = fha_nd_complete; 558 559 NFSD_LOCK(); 560 } 561 562