nfs_nfsdkrpc.c revision 1.2.10.3
1 /* $NetBSD: nfs_nfsdkrpc.c,v 1.2.10.3 2017/12/03 11:38:42 jdolecek Exp $ */ 2 /*- 3 * Copyright (c) 1989, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Rick Macklem at The University of Guelph. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 */ 34 35 #include <sys/cdefs.h> 36 /* __FBSDID("FreeBSD: head/sys/fs/nfsserver/nfs_nfsdkrpc.c 299203 2016-05-06 23:40:37Z pfg "); */ 37 __RCSID("$NetBSD: nfs_nfsdkrpc.c,v 1.2.10.3 2017/12/03 11:38:42 jdolecek Exp $"); 38 39 #ifdef _KERNEL_OPT 40 #include "opt_inet6.h" 41 #if 0 42 #include "opt_kgssapi.h" 43 #endif 44 #endif 45 46 #include <fs/nfs/common/nfsport.h> 47 48 #include <rpc/rpc.h> 49 #include <rpc/rpcsec_gss.h> 50 51 #include <fs/nfs/common/nfs_fha.h> 52 #include <fs/nfs/server/nfs_fha_new.h> 53 54 #if 0 55 #include <security/mac/mac_framework.h> 56 #endif 57 58 NFSDLOCKMUTEX; 59 NFSV4ROOTLOCKMUTEX; 60 struct nfsv4lock nfsd_suspend_lock; 61 62 /* 63 * Mapping of old NFS Version 2 RPC numbers to generic numbers. 64 */ 65 int newnfs_nfsv3_procid[NFS_V3NPROCS] = { 66 NFSPROC_NULL, 67 NFSPROC_GETATTR, 68 NFSPROC_SETATTR, 69 NFSPROC_NOOP, 70 NFSPROC_LOOKUP, 71 NFSPROC_READLINK, 72 NFSPROC_READ, 73 NFSPROC_NOOP, 74 NFSPROC_WRITE, 75 NFSPROC_CREATE, 76 NFSPROC_REMOVE, 77 NFSPROC_RENAME, 78 NFSPROC_LINK, 79 NFSPROC_SYMLINK, 80 NFSPROC_MKDIR, 81 NFSPROC_RMDIR, 82 NFSPROC_READDIR, 83 NFSPROC_FSSTAT, 84 NFSPROC_NOOP, 85 NFSPROC_NOOP, 86 NFSPROC_NOOP, 87 NFSPROC_NOOP, 88 }; 89 90 91 SYSCTL_DECL(_vfs_nfsd); 92 93 SVCPOOL *nfsrvd_pool; 94 95 static int nfs_privport = 0; 96 SYSCTL_INT(_vfs_nfsd, OID_AUTO, nfs_privport, CTLFLAG_RWTUN, 97 &nfs_privport, 0, 98 "Only allow clients using a privileged port for NFSv2 and 3"); 99 100 static int nfs_minvers = NFS_VER2; 101 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers, CTLFLAG_RWTUN, 102 &nfs_minvers, 0, "The lowest version of NFS handled by the server"); 103 104 static int nfs_maxvers = NFS_VER4; 105 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_max_nfsvers, CTLFLAG_RWTUN, 106 &nfs_maxvers, 0, "The highest version of NFS handled by the server"); 107 108 static int nfs_proc(struct nfsrv_descript *, u_int32_t, SVCXPRT *xprt, 109 struct nfsrvcache **); 110 111 extern u_long sb_max_adj; 112 extern int newnfs_numnfsd; 113 extern struct proc *nfsd_master_proc; 114 115 /* 116 * NFS server system calls 117 */ 118 119 static void 120 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt) 121 { 122 struct nfsrv_descript nd; 123 struct nfsrvcache *rp = NULL; 124 int cacherep, credflavor; 125 126 memset(&nd, 0, sizeof(nd)); 127 if (rqst->rq_vers == NFS_VER2) { 128 if (rqst->rq_proc > NFSV2PROC_STATFS || 129 newnfs_nfsv3_procid[rqst->rq_proc] == NFSPROC_NOOP) { 130 svcerr_noproc(rqst); 131 svc_freereq(rqst); 132 goto out; 133 } 134 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc]; 135 nd.nd_flag = ND_NFSV2; 136 } else if (rqst->rq_vers == NFS_VER3) { 137 if (rqst->rq_proc >= NFS_V3NPROCS) { 138 svcerr_noproc(rqst); 139 svc_freereq(rqst); 140 goto out; 141 } 142 nd.nd_procnum = rqst->rq_proc; 143 nd.nd_flag = ND_NFSV3; 144 } else { 145 if (rqst->rq_proc != NFSPROC_NULL && 146 rqst->rq_proc != NFSV4PROC_COMPOUND) { 147 svcerr_noproc(rqst); 148 svc_freereq(rqst); 149 goto out; 150 } 151 nd.nd_procnum = rqst->rq_proc; 152 nd.nd_flag = ND_NFSV4; 153 } 154 155 /* 156 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 - 157 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP 158 * mounts. 159 */ 160 nd.nd_mrep = rqst->rq_args; 161 rqst->rq_args = NULL; 162 newnfs_realign(&nd.nd_mrep, M_WAITOK); 163 nd.nd_md = nd.nd_mrep; 164 nd.nd_dpos = mtod(nd.nd_md, caddr_t); 165 nd.nd_nam = svc_getrpccaller(rqst); 166 nd.nd_nam2 = rqst->rq_addr; 167 nd.nd_mreq = NULL; 168 nd.nd_cred = NULL; 169 170 if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) { 171 /* Check if source port is privileged */ 172 u_short port; 173 struct sockaddr *nam = nd.nd_nam; 174 struct sockaddr_in *sin; 175 176 sin = (struct sockaddr_in *)nam; 177 /* 178 * INET/INET6 - same code: 179 * sin_port and sin6_port are at same offset 180 */ 181 port = ntohs(sin->sin_port); 182 if (port >= IPPORT_RESERVED && 183 nd.nd_procnum != NFSPROC_NULL) { 184 #ifdef INET6 185 char b6[INET6_ADDRSTRLEN]; 186 #if defined(_MODULE) 187 /* Do not use ip6_sprintf: the nfs module should work without INET6. */ 188 #define ip6_sprintf(buf, a) \ 189 (snprintf((buf), sizeof(buf), "%x:%x:%x:%x:%x:%x:%x:%x", \ 190 (a)->s6_addr16[0], (a)->s6_addr16[1], \ 191 (a)->s6_addr16[2], (a)->s6_addr16[3], \ 192 (a)->s6_addr16[4], (a)->s6_addr16[5], \ 193 (a)->s6_addr16[6], (a)->s6_addr16[7]), \ 194 (buf)) 195 #endif 196 #endif 197 printf("NFS request from unprivileged port (%s:%d)\n", 198 #ifdef INET6 199 sin->sin_family == AF_INET6 ? 200 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) : 201 #if defined(_MODULE) 202 #undef ip6_sprintf 203 #endif 204 #endif 205 inet_ntoa(sin->sin_addr), port); 206 svcerr_weakauth(rqst); 207 svc_freereq(rqst); 208 m_freem(nd.nd_mrep); 209 goto out; 210 } 211 } 212 213 if (nd.nd_procnum != NFSPROC_NULL) { 214 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) { 215 svcerr_weakauth(rqst); 216 svc_freereq(rqst); 217 m_freem(nd.nd_mrep); 218 goto out; 219 } 220 221 /* Set the flag based on credflavor */ 222 if (credflavor == RPCSEC_GSS_KRB5) { 223 nd.nd_flag |= ND_GSS; 224 } else if (credflavor == RPCSEC_GSS_KRB5I) { 225 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY); 226 } else if (credflavor == RPCSEC_GSS_KRB5P) { 227 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY); 228 } else if (credflavor != AUTH_SYS) { 229 svcerr_weakauth(rqst); 230 svc_freereq(rqst); 231 m_freem(nd.nd_mrep); 232 goto out; 233 } 234 235 #ifdef MAC 236 mac_cred_associate_nfsd(nd.nd_cred); 237 #endif 238 /* 239 * Get a refcnt (shared lock) on nfsd_suspend_lock. 240 * NFSSVC_SUSPENDNFSD will take an exclusive lock on 241 * nfsd_suspend_lock to suspend these threads. 242 * The call to nfsv4_lock() that precedes nfsv4_getref() 243 * ensures that the acquisition of the exclusive lock 244 * takes priority over acquisition of the shared lock by 245 * waiting for any exclusive lock request to complete. 246 * This must be done here, before the check of 247 * nfsv4root exports by nfsvno_v4rootexport(). 248 */ 249 NFSLOCKV4ROOTMUTEX(); 250 nfsv4_lock(&nfsd_suspend_lock, 0, NULL, NFSV4ROOTLOCKMUTEXPTR, 251 NULL); 252 nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, 253 NULL); 254 NFSUNLOCKV4ROOTMUTEX(); 255 256 if ((nd.nd_flag & ND_NFSV4) != 0) { 257 nd.nd_repstat = nfsvno_v4rootexport(&nd); 258 if (nd.nd_repstat != 0) { 259 NFSLOCKV4ROOTMUTEX(); 260 nfsv4_relref(&nfsd_suspend_lock); 261 NFSUNLOCKV4ROOTMUTEX(); 262 svcerr_weakauth(rqst); 263 svc_freereq(rqst); 264 m_freem(nd.nd_mrep); 265 goto out; 266 } 267 } 268 269 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp); 270 NFSLOCKV4ROOTMUTEX(); 271 nfsv4_relref(&nfsd_suspend_lock); 272 NFSUNLOCKV4ROOTMUTEX(); 273 } else { 274 NFSMGET(nd.nd_mreq); 275 nd.nd_mreq->m_len = 0; 276 cacherep = RC_REPLY; 277 } 278 if (nd.nd_mrep != NULL) 279 m_freem(nd.nd_mrep); 280 281 if (nd.nd_cred != NULL) 282 crfree(nd.nd_cred); 283 284 if (cacherep == RC_DROPIT) { 285 if (nd.nd_mreq != NULL) 286 m_freem(nd.nd_mreq); 287 svc_freereq(rqst); 288 goto out; 289 } 290 291 if (nd.nd_mreq == NULL) { 292 svcerr_decode(rqst); 293 svc_freereq(rqst); 294 goto out; 295 } 296 297 if (nd.nd_repstat & NFSERR_AUTHERR) { 298 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR); 299 if (nd.nd_mreq != NULL) 300 m_freem(nd.nd_mreq); 301 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) { 302 svcerr_systemerr(rqst); 303 } 304 if (rp != NULL) { 305 nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 || 306 SVC_ACK(xprt, NULL)), rqst->rq_reply_seq); 307 } 308 svc_freereq(rqst); 309 310 out: 311 if (softdep_ast_cleanup != NULL) 312 softdep_ast_cleanup(); 313 NFSEXITCODE(0); 314 } 315 316 /* 317 * Check the cache and, optionally, do the RPC. 318 * Return the appropriate cache response. 319 */ 320 static int 321 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt, 322 struct nfsrvcache **rpp) 323 { 324 struct thread *td = curthread; 325 int cacherep = RC_DOIT, isdgram, taglen = -1; 326 struct mbuf *m; 327 u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL; 328 u_int32_t minorvers = 0; 329 uint32_t ack; 330 331 *rpp = NULL; 332 if (nd->nd_nam2 == NULL) { 333 nd->nd_flag |= ND_STREAMSOCK; 334 isdgram = 0; 335 } else { 336 isdgram = 1; 337 } 338 339 /* 340 * Two cases: 341 * 1 - For NFSv2 over UDP, if we are near our malloc/mget 342 * limit, just drop the request. There is no 343 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the 344 * client will timeout/retry over UDP in a little while. 345 * 2 - nd_repstat == 0 && nd_mreq == NULL, which 346 * means a normal nfs rpc, so check the cache 347 */ 348 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL && 349 nfsrv_mallocmget_limit()) { 350 cacherep = RC_DROPIT; 351 } else { 352 /* 353 * For NFSv3, play it safe and assume that the client is 354 * doing retries on the same TCP connection. 355 */ 356 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) == 357 ND_STREAMSOCK) 358 nd->nd_flag |= ND_SAMETCPCONN; 359 nd->nd_retxid = xid; 360 nd->nd_tcpconntime = NFSD_MONOSEC; 361 nd->nd_sockref = xprt->xp_sockref; 362 if ((nd->nd_flag & ND_NFSV4) != 0) 363 nfsd_getminorvers(nd, tag, &tagstr, &taglen, 364 &minorvers); 365 if ((nd->nd_flag & ND_NFSV41) != 0) 366 /* NFSv4.1 caches replies in the session slots. */ 367 cacherep = RC_DOIT; 368 else { 369 cacherep = nfsrvd_getcache(nd); 370 ack = 0; 371 SVC_ACK(xprt, &ack); 372 nfsrc_trimcache(xprt->xp_sockref, ack, 0); 373 } 374 } 375 376 /* 377 * Handle the request. There are three cases. 378 * RC_DOIT - do the RPC 379 * RC_REPLY - return the reply already created 380 * RC_DROPIT - just throw the request away 381 */ 382 if (cacherep == RC_DOIT) { 383 if ((nd->nd_flag & ND_NFSV41) != 0) 384 nd->nd_xprt = xprt; 385 nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers, td); 386 if ((nd->nd_flag & ND_NFSV41) != 0) { 387 if (nd->nd_repstat != NFSERR_REPLYFROMCACHE && 388 (nd->nd_flag & ND_SAVEREPLY) != 0) { 389 /* Cache a copy of the reply. */ 390 m = m_copym(nd->nd_mreq, 0, M_COPYALL, 391 M_WAITOK); 392 } else 393 m = NULL; 394 if ((nd->nd_flag & ND_HASSEQUENCE) != 0) 395 nfsrv_cache_session(nd->nd_sessionid, 396 nd->nd_slotid, nd->nd_repstat, &m); 397 if (nd->nd_repstat == NFSERR_REPLYFROMCACHE) 398 nd->nd_repstat = 0; 399 cacherep = RC_REPLY; 400 } else { 401 if (nd->nd_repstat == NFSERR_DONTREPLY) 402 cacherep = RC_DROPIT; 403 else 404 cacherep = RC_REPLY; 405 *rpp = nfsrvd_updatecache(nd); 406 } 407 } 408 if (tagstr != NULL && taglen > NFSV4_SMALLSTR) 409 free(tagstr, M_TEMP); 410 411 NFSEXITCODE2(0, nd); 412 return (cacherep); 413 } 414 415 static void 416 nfssvc_loss(SVCXPRT *xprt) 417 { 418 uint32_t ack; 419 420 ack = 0; 421 SVC_ACK(xprt, &ack); 422 nfsrc_trimcache(xprt->xp_sockref, ack, 1); 423 } 424 425 /* 426 * Adds a socket to the list for servicing by nfsds. 427 */ 428 int 429 nfsrvd_addsock(struct file *fp) 430 { 431 int siz; 432 struct socket *so; 433 int error = 0; 434 SVCXPRT *xprt; 435 static u_int64_t sockref = 0; 436 437 so = fp->f_data; 438 439 siz = sb_max_adj; 440 error = soreserve(so, siz, siz); 441 if (error) 442 goto out; 443 444 /* 445 * Steal the socket from userland so that it doesn't close 446 * unexpectedly. 447 */ 448 if (so->so_type == SOCK_DGRAM) 449 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0); 450 else 451 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0); 452 if (xprt) { 453 fp->f_ops = &badfileops; 454 fp->f_data = NULL; 455 xprt->xp_sockref = ++sockref; 456 if (nfs_minvers == NFS_VER2) 457 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, 458 NULL); 459 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3) 460 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, 461 NULL); 462 if (nfs_maxvers >= NFS_VER4) 463 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program, 464 NULL); 465 if (so->so_type == SOCK_STREAM) 466 svc_loss_reg(xprt, nfssvc_loss); 467 SVC_RELEASE(xprt); 468 } 469 470 out: 471 NFSEXITCODE(error); 472 return (error); 473 } 474 475 /* 476 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 477 * until it is killed by a signal. 478 */ 479 int 480 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args) 481 { 482 char principal[MAXHOSTNAMELEN + 5]; 483 struct proc *p; 484 int error = 0; 485 bool_t ret2, ret3, ret4; 486 487 error = copyinstr(args->principal, principal, sizeof (principal), 488 NULL); 489 if (error) 490 goto out; 491 492 /* 493 * Only the first nfsd actually does any work. The RPC code 494 * adds threads to it as needed. Any extra processes offered 495 * by nfsd just exit. If nfsd is new enough, it will call us 496 * once with a structure that specifies how many threads to 497 * use. 498 */ 499 NFSD_LOCK(); 500 if (newnfs_numnfsd == 0) { 501 p = td->td_proc; 502 PROC_LOCK(p); 503 p->p_flag2 |= P2_AST_SU; 504 PROC_UNLOCK(p); 505 newnfs_numnfsd++; 506 507 NFSD_UNLOCK(); 508 509 /* An empty string implies AUTH_SYS only. */ 510 if (principal[0] != '\0') { 511 ret2 = rpc_gss_set_svc_name_call(principal, 512 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER2); 513 ret3 = rpc_gss_set_svc_name_call(principal, 514 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER3); 515 ret4 = rpc_gss_set_svc_name_call(principal, 516 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER4); 517 518 if (!ret2 || !ret3 || !ret4) 519 printf("nfsd: can't register svc name\n"); 520 } 521 522 nfsrvd_pool->sp_minthreads = args->minthreads; 523 nfsrvd_pool->sp_maxthreads = args->maxthreads; 524 525 svc_run(nfsrvd_pool); 526 527 if (principal[0] != '\0') { 528 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2); 529 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3); 530 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4); 531 } 532 533 NFSD_LOCK(); 534 newnfs_numnfsd--; 535 nfsrvd_init(1); 536 PROC_LOCK(p); 537 p->p_flag2 &= ~P2_AST_SU; 538 PROC_UNLOCK(p); 539 } 540 NFSD_UNLOCK(); 541 542 out: 543 NFSEXITCODE(error); 544 return (error); 545 } 546 547 /* 548 * Initialize the data structures for the server. 549 * Handshake with any new nfsds starting up to avoid any chance of 550 * corruption. 551 */ 552 void 553 nfsrvd_init(int terminating) 554 { 555 556 NFSD_LOCK_ASSERT(); 557 558 if (terminating) { 559 nfsd_master_proc = NULL; 560 NFSD_UNLOCK(); 561 nfsrv_freeallbackchannel_xprts(); 562 svcpool_destroy(nfsrvd_pool); 563 nfsrvd_pool = NULL; 564 NFSD_LOCK(); 565 } 566 567 NFSD_UNLOCK(); 568 569 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsd)); 570 nfsrvd_pool->sp_rcache = NULL; 571 nfsrvd_pool->sp_assign = fhanew_assign; 572 nfsrvd_pool->sp_done = fha_nd_complete; 573 574 NFSD_LOCK(); 575 } 576 577
Indexes created Wed Oct 01 15:09:59 GMT 2025