nfs_nfsdkrpc.c revision 1.3
1 /* $NetBSD: nfs_nfsdkrpc.c,v 1.3 2016/11/18 08:31:30 pgoyette 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 1.3 2016/11/18 08:31:30 pgoyette Exp $"); 38 39 #include "opt_inet6.h" 40 #include "opt_kgssapi.h" 41 42 #include <fs/nfs/nfsport.h> 43 44 #include <rpc/rpc.h> 45 #include <rpc/rpcsec_gss.h> 46 47 #include <nfs/nfs_fha.h> 48 #include <fs/nfsserver/nfs_fha_new.h> 49 50 #include <security/mac/mac_framework.h> 51 52 NFSDLOCKMUTEX; 53 NFSV4ROOTLOCKMUTEX; 54 struct nfsv4lock nfsd_suspend_lock; 55 56 /* 57 * Mapping of old NFS Version 2 RPC numbers to generic numbers. 58 */ 59 int newnfs_nfsv3_procid[NFS_V3NPROCS] = { 60 NFSPROC_NULL, 61 NFSPROC_GETATTR, 62 NFSPROC_SETATTR, 63 NFSPROC_NOOP, 64 NFSPROC_LOOKUP, 65 NFSPROC_READLINK, 66 NFSPROC_READ, 67 NFSPROC_NOOP, 68 NFSPROC_WRITE, 69 NFSPROC_CREATE, 70 NFSPROC_REMOVE, 71 NFSPROC_RENAME, 72 NFSPROC_LINK, 73 NFSPROC_SYMLINK, 74 NFSPROC_MKDIR, 75 NFSPROC_RMDIR, 76 NFSPROC_READDIR, 77 NFSPROC_FSSTAT, 78 NFSPROC_NOOP, 79 NFSPROC_NOOP, 80 NFSPROC_NOOP, 81 NFSPROC_NOOP, 82 }; 83 84 85 SYSCTL_DECL(_vfs_nfsd); 86 87 SVCPOOL *nfsrvd_pool; 88 89 static int nfs_privport = 0; 90 SYSCTL_INT(_vfs_nfsd, OID_AUTO, nfs_privport, CTLFLAG_RWTUN, 91 &nfs_privport, 0, 92 "Only allow clients using a privileged port for NFSv2 and 3"); 93 94 static int nfs_minvers = NFS_VER2; 95 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers, CTLFLAG_RWTUN, 96 &nfs_minvers, 0, "The lowest version of NFS handled by the server"); 97 98 static int nfs_maxvers = NFS_VER4; 99 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_max_nfsvers, CTLFLAG_RWTUN, 100 &nfs_maxvers, 0, "The highest version of NFS handled by the server"); 101 102 static int nfs_proc(struct nfsrv_descript *, u_int32_t, SVCXPRT *xprt, 103 struct nfsrvcache **); 104 105 extern u_long sb_max_adj; 106 extern int newnfs_numnfsd; 107 extern struct proc *nfsd_master_proc; 108 109 /* 110 * NFS server system calls 111 */ 112 113 static void 114 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt) 115 { 116 struct nfsrv_descript nd; 117 struct nfsrvcache *rp = NULL; 118 int cacherep, credflavor; 119 120 memset(&nd, 0, sizeof(nd)); 121 if (rqst->rq_vers == NFS_VER2) { 122 if (rqst->rq_proc > NFSV2PROC_STATFS || 123 newnfs_nfsv3_procid[rqst->rq_proc] == NFSPROC_NOOP) { 124 svcerr_noproc(rqst); 125 svc_freereq(rqst); 126 goto out; 127 } 128 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc]; 129 nd.nd_flag = ND_NFSV2; 130 } else if (rqst->rq_vers == NFS_VER3) { 131 if (rqst->rq_proc >= NFS_V3NPROCS) { 132 svcerr_noproc(rqst); 133 svc_freereq(rqst); 134 goto out; 135 } 136 nd.nd_procnum = rqst->rq_proc; 137 nd.nd_flag = ND_NFSV3; 138 } else { 139 if (rqst->rq_proc != NFSPROC_NULL && 140 rqst->rq_proc != NFSV4PROC_COMPOUND) { 141 svcerr_noproc(rqst); 142 svc_freereq(rqst); 143 goto out; 144 } 145 nd.nd_procnum = rqst->rq_proc; 146 nd.nd_flag = ND_NFSV4; 147 } 148 149 /* 150 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 - 151 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP 152 * mounts. 153 */ 154 nd.nd_mrep = rqst->rq_args; 155 rqst->rq_args = NULL; 156 newnfs_realign(&nd.nd_mrep, M_WAITOK); 157 nd.nd_md = nd.nd_mrep; 158 nd.nd_dpos = mtod(nd.nd_md, caddr_t); 159 nd.nd_nam = svc_getrpccaller(rqst); 160 nd.nd_nam2 = rqst->rq_addr; 161 nd.nd_mreq = NULL; 162 nd.nd_cred = NULL; 163 164 if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) { 165 /* Check if source port is privileged */ 166 u_short port; 167 struct sockaddr *nam = nd.nd_nam; 168 struct sockaddr_in *sin; 169 170 sin = (struct sockaddr_in *)nam; 171 /* 172 * INET/INET6 - same code: 173 * sin_port and sin6_port are at same offset 174 */ 175 port = ntohs(sin->sin_port); 176 if (port >= IPPORT_RESERVED && 177 nd.nd_procnum != NFSPROC_NULL) { 178 #ifdef INET6 179 char b6[INET6_ADDRSTRLEN]; 180 #if defined(KLD_MODULE) 181 /* Do not use ip6_sprintf: the nfs module should work without INET6. */ 182 #define ip6_sprintf(buf, a) \ 183 (snprintf((buf), sizeof(buf), "%x:%x:%x:%x:%x:%x:%x:%x", \ 184 (a)->s6_addr16[0], (a)->s6_addr16[1], \ 185 (a)->s6_addr16[2], (a)->s6_addr16[3], \ 186 (a)->s6_addr16[4], (a)->s6_addr16[5], \ 187 (a)->s6_addr16[6], (a)->s6_addr16[7]), \ 188 (buf)) 189 #endif 190 #endif 191 printf("NFS request from unprivileged port (%s:%d)\n", 192 #ifdef INET6 193 sin->sin_family == AF_INET6 ? 194 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) : 195 #if defined(KLD_MODULE) 196 #undef ip6_sprintf 197 #endif 198 #endif 199 inet_ntoa(sin->sin_addr), port); 200 svcerr_weakauth(rqst); 201 svc_freereq(rqst); 202 m_freem(nd.nd_mrep); 203 goto out; 204 } 205 } 206 207 if (nd.nd_procnum != NFSPROC_NULL) { 208 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) { 209 svcerr_weakauth(rqst); 210 svc_freereq(rqst); 211 m_freem(nd.nd_mrep); 212 goto out; 213 } 214 215 /* Set the flag based on credflavor */ 216 if (credflavor == RPCSEC_GSS_KRB5) { 217 nd.nd_flag |= ND_GSS; 218 } else if (credflavor == RPCSEC_GSS_KRB5I) { 219 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY); 220 } else if (credflavor == RPCSEC_GSS_KRB5P) { 221 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY); 222 } else if (credflavor != AUTH_SYS) { 223 svcerr_weakauth(rqst); 224 svc_freereq(rqst); 225 m_freem(nd.nd_mrep); 226 goto out; 227 } 228 229 #ifdef MAC 230 mac_cred_associate_nfsd(nd.nd_cred); 231 #endif 232 /* 233 * Get a refcnt (shared lock) on nfsd_suspend_lock. 234 * NFSSVC_SUSPENDNFSD will take an exclusive lock on 235 * nfsd_suspend_lock to suspend these threads. 236 * The call to nfsv4_lock() that precedes nfsv4_getref() 237 * ensures that the acquisition of the exclusive lock 238 * takes priority over acquisition of the shared lock by 239 * waiting for any exclusive lock request to complete. 240 * This must be done here, before the check of 241 * nfsv4root exports by nfsvno_v4rootexport(). 242 */ 243 NFSLOCKV4ROOTMUTEX(); 244 nfsv4_lock(&nfsd_suspend_lock, 0, NULL, NFSV4ROOTLOCKMUTEXPTR, 245 NULL); 246 nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR, 247 NULL); 248 NFSUNLOCKV4ROOTMUTEX(); 249 250 if ((nd.nd_flag & ND_NFSV4) != 0) { 251 nd.nd_repstat = nfsvno_v4rootexport(&nd); 252 if (nd.nd_repstat != 0) { 253 NFSLOCKV4ROOTMUTEX(); 254 nfsv4_relref(&nfsd_suspend_lock); 255 NFSUNLOCKV4ROOTMUTEX(); 256 svcerr_weakauth(rqst); 257 svc_freereq(rqst); 258 m_freem(nd.nd_mrep); 259 goto out; 260 } 261 } 262 263 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp); 264 NFSLOCKV4ROOTMUTEX(); 265 nfsv4_relref(&nfsd_suspend_lock); 266 NFSUNLOCKV4ROOTMUTEX(); 267 } else { 268 NFSMGET(nd.nd_mreq); 269 nd.nd_mreq->m_len = 0; 270 cacherep = RC_REPLY; 271 } 272 if (nd.nd_mrep != NULL) 273 m_freem(nd.nd_mrep); 274 275 if (nd.nd_cred != NULL) 276 crfree(nd.nd_cred); 277 278 if (cacherep == RC_DROPIT) { 279 if (nd.nd_mreq != NULL) 280 m_freem(nd.nd_mreq); 281 svc_freereq(rqst); 282 goto out; 283 } 284 285 if (nd.nd_mreq == NULL) { 286 svcerr_decode(rqst); 287 svc_freereq(rqst); 288 goto out; 289 } 290 291 if (nd.nd_repstat & NFSERR_AUTHERR) { 292 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR); 293 if (nd.nd_mreq != NULL) 294 m_freem(nd.nd_mreq); 295 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) { 296 svcerr_systemerr(rqst); 297 } 298 if (rp != NULL) { 299 nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 || 300 SVC_ACK(xprt, NULL)), rqst->rq_reply_seq); 301 } 302 svc_freereq(rqst); 303 304 out: 305 if (softdep_ast_cleanup != NULL) 306 softdep_ast_cleanup(); 307 NFSEXITCODE(0); 308 } 309 310 /* 311 * Check the cache and, optionally, do the RPC. 312 * Return the appropriate cache response. 313 */ 314 static int 315 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt, 316 struct nfsrvcache **rpp) 317 { 318 struct thread *td = curthread; 319 int cacherep = RC_DOIT, isdgram, taglen = -1; 320 struct mbuf *m; 321 u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL; 322 u_int32_t minorvers = 0; 323 uint32_t ack; 324 325 *rpp = NULL; 326 if (nd->nd_nam2 == NULL) { 327 nd->nd_flag |= ND_STREAMSOCK; 328 isdgram = 0; 329 } else { 330 isdgram = 1; 331 } 332 333 /* 334 * Two cases: 335 * 1 - For NFSv2 over UDP, if we are near our malloc/mget 336 * limit, just drop the request. There is no 337 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the 338 * client will timeout/retry over UDP in a little while. 339 * 2 - nd_repstat == 0 && nd_mreq == NULL, which 340 * means a normal nfs rpc, so check the cache 341 */ 342 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL && 343 nfsrv_mallocmget_limit()) { 344 cacherep = RC_DROPIT; 345 } else { 346 /* 347 * For NFSv3, play it safe and assume that the client is 348 * doing retries on the same TCP connection. 349 */ 350 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) == 351 ND_STREAMSOCK) 352 nd->nd_flag |= ND_SAMETCPCONN; 353 nd->nd_retxid = xid; 354 nd->nd_tcpconntime = NFSD_MONOSEC; 355 nd->nd_sockref = xprt->xp_sockref; 356 if ((nd->nd_flag & ND_NFSV4) != 0) 357 nfsd_getminorvers(nd, tag, &tagstr, &taglen, 358 &minorvers); 359 if ((nd->nd_flag & ND_NFSV41) != 0) 360 /* NFSv4.1 caches replies in the session slots. */ 361 cacherep = RC_DOIT; 362 else { 363 cacherep = nfsrvd_getcache(nd); 364 ack = 0; 365 SVC_ACK(xprt, &ack); 366 nfsrc_trimcache(xprt->xp_sockref, ack, 0); 367 } 368 } 369 370 /* 371 * Handle the request. There are three cases. 372 * RC_DOIT - do the RPC 373 * RC_REPLY - return the reply already created 374 * RC_DROPIT - just throw the request away 375 */ 376 if (cacherep == RC_DOIT) { 377 if ((nd->nd_flag & ND_NFSV41) != 0) 378 nd->nd_xprt = xprt; 379 nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers, td); 380 if ((nd->nd_flag & ND_NFSV41) != 0) { 381 if (nd->nd_repstat != NFSERR_REPLYFROMCACHE && 382 (nd->nd_flag & ND_SAVEREPLY) != 0) { 383 /* Cache a copy of the reply. */ 384 m = m_copym(nd->nd_mreq, 0, M_COPYALL, 385 M_WAITOK); 386 } else 387 m = NULL; 388 if ((nd->nd_flag & ND_HASSEQUENCE) != 0) 389 nfsrv_cache_session(nd->nd_sessionid, 390 nd->nd_slotid, nd->nd_repstat, &m); 391 if (nd->nd_repstat == NFSERR_REPLYFROMCACHE) 392 nd->nd_repstat = 0; 393 cacherep = RC_REPLY; 394 } else { 395 if (nd->nd_repstat == NFSERR_DONTREPLY) 396 cacherep = RC_DROPIT; 397 else 398 cacherep = RC_REPLY; 399 *rpp = nfsrvd_updatecache(nd); 400 } 401 } 402 if (tagstr != NULL && taglen > NFSV4_SMALLSTR) 403 free(tagstr, M_TEMP); 404 405 NFSEXITCODE2(0, nd); 406 return (cacherep); 407 } 408 409 static void 410 nfssvc_loss(SVCXPRT *xprt) 411 { 412 uint32_t ack; 413 414 ack = 0; 415 SVC_ACK(xprt, &ack); 416 nfsrc_trimcache(xprt->xp_sockref, ack, 1); 417 } 418 419 /* 420 * Adds a socket to the list for servicing by nfsds. 421 */ 422 int 423 nfsrvd_addsock(struct file *fp) 424 { 425 int siz; 426 struct socket *so; 427 int error = 0; 428 SVCXPRT *xprt; 429 static u_int64_t sockref = 0; 430 431 so = fp->f_data; 432 433 siz = sb_max_adj; 434 error = soreserve(so, siz, siz); 435 if (error) 436 goto out; 437 438 /* 439 * Steal the socket from userland so that it doesn't close 440 * unexpectedly. 441 */ 442 if (so->so_type == SOCK_DGRAM) 443 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0); 444 else 445 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0); 446 if (xprt) { 447 fp->f_ops = &badfileops; 448 fp->f_data = NULL; 449 xprt->xp_sockref = ++sockref; 450 if (nfs_minvers == NFS_VER2) 451 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, 452 NULL); 453 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3) 454 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, 455 NULL); 456 if (nfs_maxvers >= NFS_VER4) 457 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program, 458 NULL); 459 if (so->so_type == SOCK_STREAM) 460 svc_loss_reg(xprt, nfssvc_loss); 461 SVC_RELEASE(xprt); 462 } 463 464 out: 465 NFSEXITCODE(error); 466 return (error); 467 } 468 469 /* 470 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 471 * until it is killed by a signal. 472 */ 473 int 474 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args) 475 { 476 char principal[MAXHOSTNAMELEN + 5]; 477 struct proc *p; 478 int error = 0; 479 bool_t ret2, ret3, ret4; 480 481 error = copyinstr(args->principal, principal, sizeof (principal), 482 NULL); 483 if (error) 484 goto out; 485 486 /* 487 * Only the first nfsd actually does any work. The RPC code 488 * adds threads to it as needed. Any extra processes offered 489 * by nfsd just exit. If nfsd is new enough, it will call us 490 * once with a structure that specifies how many threads to 491 * use. 492 */ 493 NFSD_LOCK(); 494 if (newnfs_numnfsd == 0) { 495 p = td->td_proc; 496 PROC_LOCK(p); 497 p->p_flag2 |= P2_AST_SU; 498 PROC_UNLOCK(p); 499 newnfs_numnfsd++; 500 501 NFSD_UNLOCK(); 502 503 /* An empty string implies AUTH_SYS only. */ 504 if (principal[0] != '\0') { 505 ret2 = rpc_gss_set_svc_name_call(principal, 506 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER2); 507 ret3 = rpc_gss_set_svc_name_call(principal, 508 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER3); 509 ret4 = rpc_gss_set_svc_name_call(principal, 510 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER4); 511 512 if (!ret2 || !ret3 || !ret4) 513 printf("nfsd: can't register svc name\n"); 514 } 515 516 nfsrvd_pool->sp_minthreads = args->minthreads; 517 nfsrvd_pool->sp_maxthreads = args->maxthreads; 518 519 svc_run(nfsrvd_pool); 520 521 if (principal[0] != '\0') { 522 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2); 523 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3); 524 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4); 525 } 526 527 NFSD_LOCK(); 528 newnfs_numnfsd--; 529 nfsrvd_init(1); 530 PROC_LOCK(p); 531 p->p_flag2 &= ~P2_AST_SU; 532 PROC_UNLOCK(p); 533 } 534 NFSD_UNLOCK(); 535 536 out: 537 NFSEXITCODE(error); 538 return (error); 539 } 540 541 /* 542 * Initialize the data structures for the server. 543 * Handshake with any new nfsds starting up to avoid any chance of 544 * corruption. 545 */ 546 void 547 nfsrvd_init(int terminating) 548 { 549 550 NFSD_LOCK_ASSERT(); 551 552 if (terminating) { 553 nfsd_master_proc = NULL; 554 NFSD_UNLOCK(); 555 nfsrv_freeallbackchannel_xprts(); 556 svcpool_destroy(nfsrvd_pool); 557 nfsrvd_pool = NULL; 558 NFSD_LOCK(); 559 } 560 561 NFSD_UNLOCK(); 562 563 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsd)); 564 nfsrvd_pool->sp_rcache = NULL; 565 nfsrvd_pool->sp_assign = fhanew_assign; 566 nfsrvd_pool->sp_done = fha_nd_complete; 567 568 NFSD_LOCK(); 569 } 570 571
Indexes created Tue Sep 23 23:09:58 GMT 2025