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 <security/mac/mac_framework.h> 46 47 NFSDLOCKMUTEX; 48 49 /* 50 * Mapping of old NFS Version 2 RPC numbers to generic numbers. 51 */ 52 static int newnfs_nfsv3_procid[NFS_V3NPROCS] = { 53 NFSPROC_NULL, 54 NFSPROC_GETATTR, 55 NFSPROC_SETATTR, 56 NFSPROC_NOOP, 57 NFSPROC_LOOKUP, 58 NFSPROC_READLINK, 59 NFSPROC_READ, 60 NFSPROC_NOOP, 61 NFSPROC_WRITE, 62 NFSPROC_CREATE, 63 NFSPROC_REMOVE, 64 NFSPROC_RENAME, 65 NFSPROC_LINK, 66 NFSPROC_SYMLINK, 67 NFSPROC_MKDIR, 68 NFSPROC_RMDIR, 69 NFSPROC_READDIR, 70 NFSPROC_FSSTAT, 71 NFSPROC_NOOP, 72 NFSPROC_NOOP, 73 NFSPROC_NOOP, 74 NFSPROC_NOOP, 75 }; 76 77 78 SYSCTL_DECL(_vfs_newnfs); 79 80 SVCPOOL *nfsrvd_pool; 81 82 static int nfs_privport = 0; 83 SYSCTL_INT(_vfs_newnfs, OID_AUTO, nfs_privport, CTLFLAG_RW, 84 &nfs_privport, 0, 85 "Only allow clients using a privileged port for NFSv2 and 3"); 86 87 static int nfs_minvers = NFS_VER2; 88 SYSCTL_INT(_vfs_newnfs, OID_AUTO, server_min_nfsvers, CTLFLAG_RW, 89 &nfs_minvers, 0, "The lowest version of NFS handled by the server"); 90 91 static int nfs_maxvers = NFS_VER4; 92 SYSCTL_INT(_vfs_newnfs, OID_AUTO, server_max_nfsvers, CTLFLAG_RW, 93 &nfs_maxvers, 0, "The highest version of NFS handled by the server"); 94 95 static int nfs_proc(struct nfsrv_descript *, u_int32_t, struct socket *, 96 u_int64_t, struct nfsrvcache **); 97 98 extern u_long sb_max_adj; 99 extern int newnfs_numnfsd; 100 101 /* 102 * NFS server system calls 103 */ 104 105 static void 106 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt) 107 { 108 struct nfsrv_descript nd; 109 struct nfsrvcache *rp = NULL; 110 int cacherep, credflavor; 111 112 memset(&nd, 0, sizeof(nd)); 113 if (rqst->rq_vers == NFS_VER2) { 114 if (rqst->rq_proc > NFSV2PROC_STATFS) { 115 svcerr_noproc(rqst); 116 svc_freereq(rqst); 117 return; 118 } 119 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc]; 120 nd.nd_flag = ND_NFSV2; 121 } else if (rqst->rq_vers == NFS_VER3) { 122 if (rqst->rq_proc >= NFS_V3NPROCS) { 123 svcerr_noproc(rqst); 124 svc_freereq(rqst); 125 return; 126 } 127 nd.nd_procnum = rqst->rq_proc; 128 nd.nd_flag = ND_NFSV3; 129 } else { 130 if (rqst->rq_proc != NFSPROC_NULL && 131 rqst->rq_proc != NFSV4PROC_COMPOUND) { 132 svcerr_noproc(rqst); 133 svc_freereq(rqst); 134 return; 135 } 136 nd.nd_procnum = rqst->rq_proc; 137 nd.nd_flag = ND_NFSV4; 138 } 139 140 /* 141 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 - 142 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP 143 * mounts. 144 */ 145 nd.nd_mrep = rqst->rq_args; 146 rqst->rq_args = NULL; 147 newnfs_realign(&nd.nd_mrep); 148 nd.nd_md = nd.nd_mrep; 149 nd.nd_dpos = mtod(nd.nd_md, caddr_t); 150 nd.nd_nam = svc_getrpccaller(rqst); 151 nd.nd_nam2 = rqst->rq_addr; 152 nd.nd_mreq = NULL; 153 nd.nd_cred = NULL; 154 155 if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) { 156 /* Check if source port is privileged */ 157 u_short port; 158 struct sockaddr *nam = nd.nd_nam; 159 struct sockaddr_in *sin; 160 161 sin = (struct sockaddr_in *)nam; 162 /* 163 * INET/INET6 - same code: 164 * sin_port and sin6_port are at same offset 165 */ 166 port = ntohs(sin->sin_port); 167 if (port >= IPPORT_RESERVED && 168 nd.nd_procnum != NFSPROC_NULL) { 169 #ifdef INET6 170 char b6[INET6_ADDRSTRLEN]; 171 #if defined(KLD_MODULE) 172 /* Do not use ip6_sprintf: the nfs module should work without INET6. */ 173 #define ip6_sprintf(buf, a) \ 174 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \ 175 (a)->s6_addr16[0], (a)->s6_addr16[1], \ 176 (a)->s6_addr16[2], (a)->s6_addr16[3], \ 177 (a)->s6_addr16[4], (a)->s6_addr16[5], \ 178 (a)->s6_addr16[6], (a)->s6_addr16[7]), \ 179 (buf)) 180 #endif 181 #endif 182 printf("NFS request from unprivileged port (%s:%d)\n", 183 #ifdef INET6 184 sin->sin_family == AF_INET6 ? 185 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) : 186 #if defined(KLD_MODULE) 187 #undef ip6_sprintf 188 #endif 189 #endif 190 inet_ntoa(sin->sin_addr), port); 191 svcerr_weakauth(rqst); 192 svc_freereq(rqst); 193 m_freem(nd.nd_mrep); 194 return; 195 } 196 } 197 198 if (nd.nd_procnum != NFSPROC_NULL) { 199 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) { 200 svcerr_weakauth(rqst); 201 svc_freereq(rqst); 202 m_freem(nd.nd_mrep); 203 return; 204 } 205 206 /* Set the flag based on credflavor */ 207 if (credflavor == RPCSEC_GSS_KRB5) { 208 nd.nd_flag |= ND_GSS; 209 } else if (credflavor == RPCSEC_GSS_KRB5I) { 210 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY); 211 } else if (credflavor == RPCSEC_GSS_KRB5P) { 212 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY); 213 } else if (credflavor != AUTH_SYS) { 214 svcerr_weakauth(rqst); 215 svc_freereq(rqst); 216 m_freem(nd.nd_mrep); 217 return; 218 } 219 220 #ifdef MAC 221 mac_cred_associate_nfsd(nd.nd_cred); 222 #endif 223 if ((nd.nd_flag & ND_NFSV4) != 0) { 224 nd.nd_repstat = nfsvno_v4rootexport(&nd); 225 if (nd.nd_repstat != 0) { 226 svcerr_weakauth(rqst); 227 svc_freereq(rqst); 228 m_freem(nd.nd_mrep); 229 return; 230 } 231 } 232 233 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt->xp_socket, 234 xprt->xp_sockref, &rp); 235 } else { 236 NFSMGET(nd.nd_mreq); 237 nd.nd_mreq->m_len = 0; 238 cacherep = RC_REPLY; 239 } 240 if (nd.nd_mrep != NULL) 241 m_freem(nd.nd_mrep); 242 243 if (nd.nd_cred != NULL) 244 crfree(nd.nd_cred); 245 246 if (cacherep == RC_DROPIT) { 247 if (nd.nd_mreq != NULL) 248 m_freem(nd.nd_mreq); 249 svc_freereq(rqst); 250 return; 251 } 252 253 if (nd.nd_mreq == NULL) { 254 svcerr_decode(rqst); 255 svc_freereq(rqst); 256 return; 257 } 258 259 if (nd.nd_repstat & NFSERR_AUTHERR) { 260 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR); 261 if (nd.nd_mreq != NULL) 262 m_freem(nd.nd_mreq); 263 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) { 264 svcerr_systemerr(rqst); 265 } 266 if (rp != NULL) 267 nfsrvd_sentcache(rp, xprt->xp_socket, 0); 268 svc_freereq(rqst); 269 } 270 271 /* 272 * Check the cache and, optionally, do the RPC. 273 * Return the appropriate cache response. 274 */ 275 static int 276 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, struct socket *so, 277 u_int64_t sockref, struct nfsrvcache **rpp) 278 { 279 struct thread *td = curthread; 280 int cacherep = RC_DOIT, isdgram; 281 282 *rpp = NULL; 283 if (nd->nd_nam2 == NULL) { 284 nd->nd_flag |= ND_STREAMSOCK; 285 isdgram = 0; 286 } else { 287 isdgram = 1; 288 } 289 NFSGETTIME(&nd->nd_starttime); 290 291 /* 292 * Two cases: 293 * 1 - For NFSv2 over UDP, if we are near our malloc/mget 294 * limit, just drop the request. There is no 295 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the 296 * client will timeout/retry over UDP in a little while. 297 * 2 - nd_repstat == 0 && nd_mreq == NULL, which 298 * means a normal nfs rpc, so check the cache 299 */ 300 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL && 301 nfsrv_mallocmget_limit()) { 302 cacherep = RC_DROPIT; 303 } else { 304 /* 305 * For NFSv3, play it safe and assume that the client is 306 * doing retries on the same TCP connection. 307 */ 308 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) == 309 ND_STREAMSOCK) 310 nd->nd_flag |= ND_SAMETCPCONN; 311 nd->nd_retxid = xid; 312 nd->nd_tcpconntime = NFSD_MONOSEC; 313 nd->nd_sockref = sockref; 314 cacherep = nfsrvd_getcache(nd, so); 315 } 316 317 /* 318 * Handle the request. There are three cases. 319 * RC_DOIT - do the RPC 320 * RC_REPLY - return the reply already created 321 * RC_DROPIT - just throw the request away 322 */ 323 if (cacherep == RC_DOIT) { 324 nfsrvd_dorpc(nd, isdgram, td); 325 if (nd->nd_repstat == NFSERR_DONTREPLY) 326 cacherep = RC_DROPIT; 327 else 328 cacherep = RC_REPLY; 329 *rpp = nfsrvd_updatecache(nd, so); 330 } 331 return (cacherep); 332 } 333 334 /* 335 * Adds a socket to the list for servicing by nfsds. 336 */ 337 int 338 nfsrvd_addsock(struct file *fp) 339 { 340 int siz; 341 struct socket *so; 342 int error; 343 SVCXPRT *xprt; 344 static u_int64_t sockref = 0; 345 346 so = fp->f_data; 347 348 siz = sb_max_adj; 349 error = soreserve(so, siz, siz); 350 if (error) { 351 return (error); 352 } 353 354 /* 355 * Steal the socket from userland so that it doesn't close 356 * unexpectedly. 357 */ 358 if (so->so_type == SOCK_DGRAM) 359 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0); 360 else 361 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0); 362 if (xprt) { 363 fp->f_ops = &badfileops; 364 fp->f_data = NULL; 365 xprt->xp_sockref = ++sockref; 366 if (nfs_minvers == NFS_VER2) 367 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, 368 NULL); 369 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3) 370 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, 371 NULL); 372 if (nfs_maxvers >= NFS_VER4) 373 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program, 374 NULL); 375 SVC_RELEASE(xprt); 376 } 377 378 return (0); 379 } 380 381 /* 382 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 383 * until it is killed by a signal. 384 */ 385 int 386 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args) 387 { 388 #ifdef KGSSAPI 389 char principal[MAXHOSTNAMELEN + 5]; 390 int error; 391 bool_t ret2, ret3, ret4; 392 #endif 393 394 #ifdef KGSSAPI 395 error = copyinstr(args->principal, principal, sizeof (principal), 396 NULL); 397 if (error) 398 return (error); 399 #endif 400 401 /* 402 * Only the first nfsd actually does any work. The RPC code 403 * adds threads to it as needed. Any extra processes offered 404 * by nfsd just exit. If nfsd is new enough, it will call us 405 * once with a structure that specifies how many threads to 406 * use. 407 */ 408 NFSD_LOCK(); 409 if (newnfs_numnfsd == 0) { 410 newnfs_numnfsd++; 411 412 NFSD_UNLOCK(); 413 414 #ifdef KGSSAPI 415 /* An empty string implies AUTH_SYS only. */ 416 if (principal[0] != '\0') { 417 ret2 = rpc_gss_set_svc_name(principal, "kerberosv5", 418 GSS_C_INDEFINITE, NFS_PROG, NFS_VER2); 419 ret3 = rpc_gss_set_svc_name(principal, "kerberosv5", 420 GSS_C_INDEFINITE, NFS_PROG, NFS_VER3); 421 ret4 = rpc_gss_set_svc_name(principal, "kerberosv5", 422 GSS_C_INDEFINITE, NFS_PROG, NFS_VER4); 423 424 if (!ret2 || !ret3 || !ret4) { 425 NFSD_LOCK(); 426 newnfs_numnfsd--; 427 nfsrvd_init(1); 428 NFSD_UNLOCK(); 429 return (EAUTH); 430 } 431 } 432 #endif 433 434 nfsrvd_pool->sp_minthreads = args->minthreads; 435 nfsrvd_pool->sp_maxthreads = args->maxthreads; 436 437 svc_run(nfsrvd_pool); 438 439 #ifdef KGSSAPI 440 if (principal[0] != '\0') { 441 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER2); 442 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER3); 443 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER4); 444 } 445 #endif 446 447 NFSD_LOCK(); 448 newnfs_numnfsd--; 449 nfsrvd_init(1); 450 } 451 NFSD_UNLOCK(); 452 453 return (0); 454 } 455 456 /* 457 * Initialize the data structures for the server. 458 * Handshake with any new nfsds starting up to avoid any chance of 459 * corruption. 460 */ 461 void 462 nfsrvd_init(int terminating) 463 { 464 465 NFSD_LOCK_ASSERT(); 466 467 if (terminating) { 468 NFSD_UNLOCK(); 469 svcpool_destroy(nfsrvd_pool); 470 nfsrvd_pool = NULL; 471 NFSD_LOCK(); 472 } 473 474 NFSD_UNLOCK(); 475 476 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_newnfs)); 477 nfsrvd_pool->sp_rcache = NULL; 478 nfsrvd_pool->sp_assign = NULL; 479 nfsrvd_pool->sp_done = NULL; 480 481 NFSD_LOCK(); 482 } 483 484