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