1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * SMB/CIFS session setup handling routines 5 * 6 * Copyright (c) International Business Machines Corp., 2006, 2009 7 * Author(s): Steve French (sfrench@us.ibm.com) 8 * 9 */ 10 11 #include "cifspdu.h" 12 #include "cifsglob.h" 13 #include "cifsproto.h" 14 #include "cifs_unicode.h" 15 #include "cifs_debug.h" 16 #include "ntlmssp.h" 17 #include "nterr.h" 18 #include <linux/utsname.h> 19 #include <linux/slab.h> 20 #include <linux/version.h> 21 #include "cifsfs.h" 22 #include "cifs_spnego.h" 23 #include "smb2proto.h" 24 #include "fs_context.h" 25 26 static int 27 cifs_ses_add_channel(struct cifs_ses *ses, 28 struct cifs_server_iface *iface); 29 30 bool 31 is_server_using_iface(struct TCP_Server_Info *server, 32 struct cifs_server_iface *iface) 33 { 34 struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr; 35 struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr; 36 struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr; 37 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr; 38 39 if (server->dstaddr.ss_family != iface->sockaddr.ss_family) 40 return false; 41 if (server->dstaddr.ss_family == AF_INET) { 42 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr) 43 return false; 44 } else if (server->dstaddr.ss_family == AF_INET6) { 45 if (memcmp(&s6->sin6_addr, &i6->sin6_addr, 46 sizeof(i6->sin6_addr)) != 0) 47 return false; 48 } else { 49 /* unknown family.. */ 50 return false; 51 } 52 return true; 53 } 54 55 bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface) 56 { 57 int i; 58 59 spin_lock(&ses->chan_lock); 60 for (i = 0; i < ses->chan_count; i++) { 61 if (ses->chans[i].iface == iface) { 62 spin_unlock(&ses->chan_lock); 63 return true; 64 } 65 } 66 spin_unlock(&ses->chan_lock); 67 return false; 68 } 69 70 /* channel helper functions. assumed that chan_lock is held by caller. */ 71 72 int 73 cifs_ses_get_chan_index(struct cifs_ses *ses, 74 struct TCP_Server_Info *server) 75 { 76 unsigned int i; 77 78 for (i = 0; i < ses->chan_count; i++) { 79 if (ses->chans[i].server == server) 80 return i; 81 } 82 83 /* If we didn't find the channel, it is likely a bug */ 84 if (server) 85 cifs_dbg(VFS, "unable to get chan index for server: 0x%llx", 86 server->conn_id); 87 WARN_ON(1); 88 return CIFS_INVAL_CHAN_INDEX; 89 } 90 91 void 92 cifs_chan_set_in_reconnect(struct cifs_ses *ses, 93 struct TCP_Server_Info *server) 94 { 95 int chan_index = cifs_ses_get_chan_index(ses, server); 96 97 if (chan_index == CIFS_INVAL_CHAN_INDEX) 98 return; 99 100 ses->chans[chan_index].in_reconnect = true; 101 } 102 103 void 104 cifs_chan_clear_in_reconnect(struct cifs_ses *ses, 105 struct TCP_Server_Info *server) 106 { 107 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 108 109 if (chan_index == CIFS_INVAL_CHAN_INDEX) 110 return; 111 112 ses->chans[chan_index].in_reconnect = false; 113 } 114 115 bool 116 cifs_chan_in_reconnect(struct cifs_ses *ses, 117 struct TCP_Server_Info *server) 118 { 119 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 120 121 if (chan_index == CIFS_INVAL_CHAN_INDEX) 122 return true; /* err on the safer side */ 123 124 return CIFS_CHAN_IN_RECONNECT(ses, chan_index); 125 } 126 127 void 128 cifs_chan_set_need_reconnect(struct cifs_ses *ses, 129 struct TCP_Server_Info *server) 130 { 131 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 132 133 if (chan_index == CIFS_INVAL_CHAN_INDEX) 134 return; 135 136 set_bit(chan_index, &ses->chans_need_reconnect); 137 cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n", 138 chan_index, ses->chans_need_reconnect); 139 } 140 141 void 142 cifs_chan_clear_need_reconnect(struct cifs_ses *ses, 143 struct TCP_Server_Info *server) 144 { 145 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 146 147 if (chan_index == CIFS_INVAL_CHAN_INDEX) 148 return; 149 150 clear_bit(chan_index, &ses->chans_need_reconnect); 151 cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n", 152 chan_index, ses->chans_need_reconnect); 153 } 154 155 bool 156 cifs_chan_needs_reconnect(struct cifs_ses *ses, 157 struct TCP_Server_Info *server) 158 { 159 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 160 161 if (chan_index == CIFS_INVAL_CHAN_INDEX) 162 return true; /* err on the safer side */ 163 164 return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index); 165 } 166 167 bool 168 cifs_chan_is_iface_active(struct cifs_ses *ses, 169 struct TCP_Server_Info *server) 170 { 171 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 172 173 if (chan_index == CIFS_INVAL_CHAN_INDEX) 174 return true; /* err on the safer side */ 175 176 return ses->chans[chan_index].iface && 177 ses->chans[chan_index].iface->is_active; 178 } 179 180 /* returns number of channels added */ 181 int cifs_try_adding_channels(struct cifs_ses *ses) 182 { 183 struct TCP_Server_Info *server = ses->server; 184 int old_chan_count, new_chan_count; 185 int left; 186 int rc = 0; 187 int tries = 0; 188 size_t iface_weight = 0, iface_min_speed = 0; 189 struct cifs_server_iface *iface = NULL, *niface = NULL; 190 struct cifs_server_iface *last_iface = NULL; 191 192 spin_lock(&ses->chan_lock); 193 194 new_chan_count = old_chan_count = ses->chan_count; 195 left = ses->chan_max - ses->chan_count; 196 197 if (left <= 0) { 198 spin_unlock(&ses->chan_lock); 199 cifs_dbg(FYI, 200 "ses already at max_channels (%zu), nothing to open\n", 201 ses->chan_max); 202 return 0; 203 } 204 205 if (server->dialect < SMB30_PROT_ID) { 206 spin_unlock(&ses->chan_lock); 207 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n"); 208 return 0; 209 } 210 211 if (!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) { 212 spin_unlock(&ses->chan_lock); 213 cifs_server_dbg(VFS, "no multichannel support\n"); 214 return 0; 215 } 216 spin_unlock(&ses->chan_lock); 217 218 while (left > 0) { 219 220 tries++; 221 if (tries > 3*ses->chan_max) { 222 cifs_dbg(VFS, "too many channel open attempts (%d channels left to open)\n", 223 left); 224 break; 225 } 226 227 spin_lock(&ses->iface_lock); 228 if (!ses->iface_count) { 229 spin_unlock(&ses->iface_lock); 230 cifs_dbg(VFS, "server %s does not advertise interfaces\n", 231 ses->server->hostname); 232 break; 233 } 234 235 if (!iface) 236 iface = list_first_entry(&ses->iface_list, struct cifs_server_iface, 237 iface_head); 238 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface, 239 iface_head); 240 iface_min_speed = last_iface->speed; 241 242 list_for_each_entry_safe_from(iface, niface, &ses->iface_list, 243 iface_head) { 244 /* do not mix rdma and non-rdma interfaces */ 245 if (iface->rdma_capable != ses->server->rdma) 246 continue; 247 248 /* skip ifaces that are unusable */ 249 if (!iface->is_active || 250 (is_ses_using_iface(ses, iface) && 251 !iface->rss_capable)) 252 continue; 253 254 /* check if we already allocated enough channels */ 255 iface_weight = iface->speed / iface_min_speed; 256 257 if (iface->weight_fulfilled >= iface_weight) 258 continue; 259 260 /* take ref before unlock */ 261 kref_get(&iface->refcount); 262 263 spin_unlock(&ses->iface_lock); 264 rc = cifs_ses_add_channel(ses, iface); 265 spin_lock(&ses->iface_lock); 266 267 if (rc) { 268 cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n", 269 &iface->sockaddr, 270 rc); 271 kref_put(&iface->refcount, release_iface); 272 continue; 273 } 274 275 iface->num_channels++; 276 iface->weight_fulfilled++; 277 cifs_dbg(VFS, "successfully opened new channel on iface:%pIS\n", 278 &iface->sockaddr); 279 break; 280 } 281 282 /* reached end of list. reset weight_fulfilled and start over */ 283 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) { 284 list_for_each_entry(iface, &ses->iface_list, iface_head) 285 iface->weight_fulfilled = 0; 286 spin_unlock(&ses->iface_lock); 287 iface = NULL; 288 continue; 289 } 290 spin_unlock(&ses->iface_lock); 291 292 left--; 293 new_chan_count++; 294 } 295 296 return new_chan_count - old_chan_count; 297 } 298 299 /* 300 * called when multichannel is disabled by the server. 301 * this always gets called from smb2_reconnect 302 * and cannot get called in parallel threads. 303 */ 304 void 305 cifs_disable_secondary_channels(struct cifs_ses *ses) 306 { 307 int i, chan_count; 308 struct TCP_Server_Info *server; 309 struct cifs_server_iface *iface; 310 311 spin_lock(&ses->chan_lock); 312 chan_count = ses->chan_count; 313 if (chan_count == 1) 314 goto done; 315 316 ses->chan_count = 1; 317 318 /* for all secondary channels reset the need reconnect bit */ 319 ses->chans_need_reconnect &= 1; 320 321 for (i = 1; i < chan_count; i++) { 322 iface = ses->chans[i].iface; 323 server = ses->chans[i].server; 324 325 /* 326 * remove these references first, since we need to unlock 327 * the chan_lock here, since iface_lock is a higher lock 328 */ 329 ses->chans[i].iface = NULL; 330 ses->chans[i].server = NULL; 331 spin_unlock(&ses->chan_lock); 332 333 if (iface) { 334 spin_lock(&ses->iface_lock); 335 iface->num_channels--; 336 if (iface->weight_fulfilled) 337 iface->weight_fulfilled--; 338 kref_put(&iface->refcount, release_iface); 339 spin_unlock(&ses->iface_lock); 340 } 341 342 if (server) { 343 if (!server->terminate) { 344 server->terminate = true; 345 cifs_signal_cifsd_for_reconnect(server, false); 346 } 347 cifs_put_tcp_session(server, false); 348 } 349 350 spin_lock(&ses->chan_lock); 351 } 352 353 done: 354 spin_unlock(&ses->chan_lock); 355 } 356 357 /* 358 * update the iface for the channel if necessary. 359 * will return 0 when iface is updated, 1 if removed, 2 otherwise 360 * Must be called with chan_lock held. 361 */ 362 int 363 cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server) 364 { 365 unsigned int chan_index; 366 size_t iface_weight = 0, iface_min_speed = 0; 367 struct cifs_server_iface *iface = NULL; 368 struct cifs_server_iface *old_iface = NULL; 369 struct cifs_server_iface *last_iface = NULL; 370 struct sockaddr_storage ss; 371 int rc = 0; 372 373 spin_lock(&ses->chan_lock); 374 chan_index = cifs_ses_get_chan_index(ses, server); 375 if (chan_index == CIFS_INVAL_CHAN_INDEX) { 376 spin_unlock(&ses->chan_lock); 377 return 0; 378 } 379 380 if (ses->chans[chan_index].iface) { 381 old_iface = ses->chans[chan_index].iface; 382 if (old_iface->is_active) { 383 spin_unlock(&ses->chan_lock); 384 return 1; 385 } 386 } 387 spin_unlock(&ses->chan_lock); 388 389 spin_lock(&server->srv_lock); 390 ss = server->dstaddr; 391 spin_unlock(&server->srv_lock); 392 393 spin_lock(&ses->iface_lock); 394 if (!ses->iface_count) { 395 spin_unlock(&ses->iface_lock); 396 cifs_dbg(VFS, "server %s does not advertise interfaces\n", ses->server->hostname); 397 return 0; 398 } 399 400 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface, 401 iface_head); 402 iface_min_speed = last_iface->speed; 403 404 /* then look for a new one */ 405 list_for_each_entry(iface, &ses->iface_list, iface_head) { 406 if (!chan_index) { 407 /* if we're trying to get the updated iface for primary channel */ 408 if (!cifs_match_ipaddr((struct sockaddr *) &ss, 409 (struct sockaddr *) &iface->sockaddr)) 410 continue; 411 412 kref_get(&iface->refcount); 413 break; 414 } 415 416 /* do not mix rdma and non-rdma interfaces */ 417 if (iface->rdma_capable != server->rdma) 418 continue; 419 420 if (!iface->is_active || 421 (is_ses_using_iface(ses, iface) && 422 !iface->rss_capable)) { 423 continue; 424 } 425 426 /* check if we already allocated enough channels */ 427 iface_weight = iface->speed / iface_min_speed; 428 429 if (iface->weight_fulfilled >= iface_weight) 430 continue; 431 432 kref_get(&iface->refcount); 433 break; 434 } 435 436 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) { 437 rc = 1; 438 iface = NULL; 439 cifs_dbg(FYI, "unable to find a suitable iface\n"); 440 } 441 442 if (!iface) { 443 cifs_dbg(FYI, "unable to get the interface matching: %pIS\n", 444 &ss); 445 spin_unlock(&ses->iface_lock); 446 return 0; 447 } 448 449 /* now drop the ref to the current iface */ 450 if (old_iface) { 451 cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n", 452 &old_iface->sockaddr, 453 &iface->sockaddr); 454 455 old_iface->num_channels--; 456 if (old_iface->weight_fulfilled) 457 old_iface->weight_fulfilled--; 458 iface->num_channels++; 459 iface->weight_fulfilled++; 460 461 kref_put(&old_iface->refcount, release_iface); 462 } else if (old_iface) { 463 /* if a new candidate is not found, keep things as is */ 464 cifs_dbg(FYI, "could not replace iface: %pIS\n", 465 &old_iface->sockaddr); 466 } else if (!chan_index) { 467 /* special case: update interface for primary channel */ 468 if (iface) { 469 cifs_dbg(FYI, "referencing primary channel iface: %pIS\n", 470 &iface->sockaddr); 471 iface->num_channels++; 472 iface->weight_fulfilled++; 473 } 474 } 475 spin_unlock(&ses->iface_lock); 476 477 if (iface) { 478 spin_lock(&ses->chan_lock); 479 chan_index = cifs_ses_get_chan_index(ses, server); 480 if (chan_index == CIFS_INVAL_CHAN_INDEX) { 481 spin_unlock(&ses->chan_lock); 482 return 0; 483 } 484 485 ses->chans[chan_index].iface = iface; 486 spin_unlock(&ses->chan_lock); 487 } 488 489 return rc; 490 } 491 492 /* 493 * If server is a channel of ses, return the corresponding enclosing 494 * cifs_chan otherwise return NULL. 495 */ 496 struct cifs_chan * 497 cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server) 498 { 499 int i; 500 501 spin_lock(&ses->chan_lock); 502 for (i = 0; i < ses->chan_count; i++) { 503 if (ses->chans[i].server == server) { 504 spin_unlock(&ses->chan_lock); 505 return &ses->chans[i]; 506 } 507 } 508 spin_unlock(&ses->chan_lock); 509 return NULL; 510 } 511 512 static int 513 cifs_ses_add_channel(struct cifs_ses *ses, 514 struct cifs_server_iface *iface) 515 { 516 struct TCP_Server_Info *chan_server; 517 struct cifs_chan *chan; 518 struct smb3_fs_context *ctx; 519 static const char unc_fmt[] = "\\%s\\foo"; 520 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr; 521 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr; 522 size_t len; 523 int rc; 524 unsigned int xid = get_xid(); 525 526 if (iface->sockaddr.ss_family == AF_INET) 527 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n", 528 ses, iface->speed, iface->rdma_capable ? "yes" : "no", 529 &ipv4->sin_addr); 530 else 531 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n", 532 ses, iface->speed, iface->rdma_capable ? "yes" : "no", 533 &ipv6->sin6_addr); 534 535 /* 536 * Setup a ctx with mostly the same info as the existing 537 * session and overwrite it with the requested iface data. 538 * 539 * We need to setup at least the fields used for negprot and 540 * sesssetup. 541 * 542 * We only need the ctx here, so we can reuse memory from 543 * the session and server without caring about memory 544 * management. 545 */ 546 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 547 if (!ctx) { 548 rc = -ENOMEM; 549 goto out_free_xid; 550 } 551 552 /* Always make new connection for now (TODO?) */ 553 ctx->nosharesock = true; 554 555 /* Auth */ 556 ctx->domainauto = ses->domainAuto; 557 ctx->domainname = ses->domainName; 558 559 /* no hostname for extra channels */ 560 ctx->server_hostname = ""; 561 562 ctx->username = ses->user_name; 563 ctx->password = ses->password; 564 ctx->sectype = ses->sectype; 565 ctx->sign = ses->sign; 566 567 /* UNC and paths */ 568 /* XXX: Use ses->server->hostname? */ 569 len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL; 570 ctx->UNC = kzalloc(len, GFP_KERNEL); 571 if (!ctx->UNC) { 572 rc = -ENOMEM; 573 goto out_free_ctx; 574 } 575 scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr); 576 ctx->prepath = ""; 577 578 /* Reuse same version as master connection */ 579 ctx->vals = ses->server->vals; 580 ctx->ops = ses->server->ops; 581 582 ctx->noblocksnd = ses->server->noblocksnd; 583 ctx->noautotune = ses->server->noautotune; 584 ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay; 585 ctx->echo_interval = ses->server->echo_interval / HZ; 586 ctx->max_credits = ses->server->max_credits; 587 588 /* 589 * This will be used for encoding/decoding user/domain/pw 590 * during sess setup auth. 591 */ 592 ctx->local_nls = ses->local_nls; 593 594 /* Use RDMA if possible */ 595 ctx->rdma = iface->rdma_capable; 596 memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr)); 597 598 /* reuse master con client guid */ 599 memcpy(&ctx->client_guid, ses->server->client_guid, 600 sizeof(ctx->client_guid)); 601 ctx->use_client_guid = true; 602 603 chan_server = cifs_get_tcp_session(ctx, ses->server); 604 605 spin_lock(&ses->chan_lock); 606 chan = &ses->chans[ses->chan_count]; 607 chan->server = chan_server; 608 if (IS_ERR(chan->server)) { 609 rc = PTR_ERR(chan->server); 610 chan->server = NULL; 611 spin_unlock(&ses->chan_lock); 612 goto out; 613 } 614 chan->iface = iface; 615 ses->chan_count++; 616 atomic_set(&ses->chan_seq, 0); 617 618 /* Mark this channel as needing connect/setup */ 619 cifs_chan_set_need_reconnect(ses, chan->server); 620 621 spin_unlock(&ses->chan_lock); 622 623 mutex_lock(&ses->session_mutex); 624 /* 625 * We need to allocate the server crypto now as we will need 626 * to sign packets before we generate the channel signing key 627 * (we sign with the session key) 628 */ 629 rc = smb311_crypto_shash_allocate(chan->server); 630 if (rc) { 631 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__); 632 mutex_unlock(&ses->session_mutex); 633 goto out; 634 } 635 636 rc = cifs_negotiate_protocol(xid, ses, chan->server); 637 if (!rc) 638 rc = cifs_setup_session(xid, ses, chan->server, ses->local_nls); 639 640 mutex_unlock(&ses->session_mutex); 641 642 out: 643 if (rc && chan->server) { 644 cifs_put_tcp_session(chan->server, 0); 645 646 spin_lock(&ses->chan_lock); 647 648 /* we rely on all bits beyond chan_count to be clear */ 649 cifs_chan_clear_need_reconnect(ses, chan->server); 650 ses->chan_count--; 651 /* 652 * chan_count should never reach 0 as at least the primary 653 * channel is always allocated 654 */ 655 WARN_ON(ses->chan_count < 1); 656 spin_unlock(&ses->chan_lock); 657 } 658 659 kfree(ctx->UNC); 660 out_free_ctx: 661 kfree(ctx); 662 out_free_xid: 663 free_xid(xid); 664 return rc; 665 } 666 667 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 668 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, 669 struct TCP_Server_Info *server, 670 SESSION_SETUP_ANDX *pSMB) 671 { 672 __u32 capabilities = 0; 673 674 /* init fields common to all four types of SessSetup */ 675 /* Note that offsets for first seven fields in req struct are same */ 676 /* in CIFS Specs so does not matter which of 3 forms of struct */ 677 /* that we use in next few lines */ 678 /* Note that header is initialized to zero in header_assemble */ 679 pSMB->req.AndXCommand = 0xFF; 680 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32, 681 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4, 682 USHRT_MAX)); 683 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq); 684 pSMB->req.VcNumber = cpu_to_le16(1); 685 686 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ 687 688 /* BB verify whether signing required on neg or just auth frame (and NTLM case) */ 689 690 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | 691 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; 692 693 if (server->sign) 694 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; 695 696 if (ses->capabilities & CAP_UNICODE) { 697 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; 698 capabilities |= CAP_UNICODE; 699 } 700 if (ses->capabilities & CAP_STATUS32) { 701 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; 702 capabilities |= CAP_STATUS32; 703 } 704 if (ses->capabilities & CAP_DFS) { 705 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; 706 capabilities |= CAP_DFS; 707 } 708 if (ses->capabilities & CAP_UNIX) 709 capabilities |= CAP_UNIX; 710 711 return capabilities; 712 } 713 714 static void 715 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) 716 { 717 char *bcc_ptr = *pbcc_area; 718 int bytes_ret = 0; 719 720 /* Copy OS version */ 721 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32, 722 nls_cp); 723 bcc_ptr += 2 * bytes_ret; 724 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release, 725 32, nls_cp); 726 bcc_ptr += 2 * bytes_ret; 727 bcc_ptr += 2; /* trailing null */ 728 729 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, 730 32, nls_cp); 731 bcc_ptr += 2 * bytes_ret; 732 bcc_ptr += 2; /* trailing null */ 733 734 *pbcc_area = bcc_ptr; 735 } 736 737 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, 738 const struct nls_table *nls_cp) 739 { 740 char *bcc_ptr = *pbcc_area; 741 int bytes_ret = 0; 742 743 /* copy domain */ 744 if (ses->domainName == NULL) { 745 /* 746 * Sending null domain better than using a bogus domain name (as 747 * we did briefly in 2.6.18) since server will use its default 748 */ 749 *bcc_ptr = 0; 750 *(bcc_ptr+1) = 0; 751 bytes_ret = 0; 752 } else 753 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, 754 CIFS_MAX_DOMAINNAME_LEN, nls_cp); 755 bcc_ptr += 2 * bytes_ret; 756 bcc_ptr += 2; /* account for null terminator */ 757 758 *pbcc_area = bcc_ptr; 759 } 760 761 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 762 const struct nls_table *nls_cp) 763 { 764 char *bcc_ptr = *pbcc_area; 765 int bytes_ret = 0; 766 767 /* BB FIXME add check that strings less than 335 or will need to send as arrays */ 768 769 /* copy user */ 770 if (ses->user_name == NULL) { 771 /* null user mount */ 772 *bcc_ptr = 0; 773 *(bcc_ptr+1) = 0; 774 } else { 775 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name, 776 CIFS_MAX_USERNAME_LEN, nls_cp); 777 } 778 bcc_ptr += 2 * bytes_ret; 779 bcc_ptr += 2; /* account for null termination */ 780 781 unicode_domain_string(&bcc_ptr, ses, nls_cp); 782 unicode_oslm_strings(&bcc_ptr, nls_cp); 783 784 *pbcc_area = bcc_ptr; 785 } 786 787 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 788 const struct nls_table *nls_cp) 789 { 790 char *bcc_ptr = *pbcc_area; 791 int len; 792 793 /* copy user */ 794 /* BB what about null user mounts - check that we do this BB */ 795 /* copy user */ 796 if (ses->user_name != NULL) { 797 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN); 798 if (WARN_ON_ONCE(len < 0)) 799 len = CIFS_MAX_USERNAME_LEN - 1; 800 bcc_ptr += len; 801 } 802 /* else null user mount */ 803 *bcc_ptr = 0; 804 bcc_ptr++; /* account for null termination */ 805 806 /* copy domain */ 807 if (ses->domainName != NULL) { 808 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 809 if (WARN_ON_ONCE(len < 0)) 810 len = CIFS_MAX_DOMAINNAME_LEN - 1; 811 bcc_ptr += len; 812 } /* else we send a null domain name so server will default to its own domain */ 813 *bcc_ptr = 0; 814 bcc_ptr++; 815 816 /* BB check for overflow here */ 817 818 strcpy(bcc_ptr, "Linux version "); 819 bcc_ptr += strlen("Linux version "); 820 strcpy(bcc_ptr, init_utsname()->release); 821 bcc_ptr += strlen(init_utsname()->release) + 1; 822 823 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); 824 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; 825 826 *pbcc_area = bcc_ptr; 827 } 828 829 static void 830 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses, 831 const struct nls_table *nls_cp) 832 { 833 int len; 834 char *data = *pbcc_area; 835 836 cifs_dbg(FYI, "bleft %d\n", bleft); 837 838 kfree(ses->serverOS); 839 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 840 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS); 841 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 842 data += len; 843 bleft -= len; 844 if (bleft <= 0) 845 return; 846 847 kfree(ses->serverNOS); 848 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 849 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS); 850 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 851 data += len; 852 bleft -= len; 853 if (bleft <= 0) 854 return; 855 856 kfree(ses->serverDomain); 857 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 858 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain); 859 860 return; 861 } 862 863 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft, 864 struct cifs_ses *ses, 865 const struct nls_table *nls_cp) 866 { 867 int len; 868 char *bcc_ptr = *pbcc_area; 869 870 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft); 871 872 len = strnlen(bcc_ptr, bleft); 873 if (len >= bleft) 874 return; 875 876 kfree(ses->serverOS); 877 878 ses->serverOS = kmalloc(len + 1, GFP_KERNEL); 879 if (ses->serverOS) { 880 memcpy(ses->serverOS, bcc_ptr, len); 881 ses->serverOS[len] = 0; 882 if (strncmp(ses->serverOS, "OS/2", 4) == 0) 883 cifs_dbg(FYI, "OS/2 server\n"); 884 } 885 886 bcc_ptr += len + 1; 887 bleft -= len + 1; 888 889 len = strnlen(bcc_ptr, bleft); 890 if (len >= bleft) 891 return; 892 893 kfree(ses->serverNOS); 894 895 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL); 896 if (ses->serverNOS) { 897 memcpy(ses->serverNOS, bcc_ptr, len); 898 ses->serverNOS[len] = 0; 899 } 900 901 bcc_ptr += len + 1; 902 bleft -= len + 1; 903 904 len = strnlen(bcc_ptr, bleft); 905 if (len > bleft) 906 return; 907 908 /* 909 * No domain field in LANMAN case. Domain is 910 * returned by old servers in the SMB negprot response 911 * 912 * BB For newer servers which do not support Unicode, 913 * but thus do return domain here, we could add parsing 914 * for it later, but it is not very important 915 */ 916 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft); 917 } 918 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 919 920 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, 921 struct cifs_ses *ses) 922 { 923 unsigned int tioffset; /* challenge message target info area */ 924 unsigned int tilen; /* challenge message target info area length */ 925 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; 926 __u32 server_flags; 927 928 if (blob_len < sizeof(CHALLENGE_MESSAGE)) { 929 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len); 930 return -EINVAL; 931 } 932 933 if (memcmp(pblob->Signature, "NTLMSSP", 8)) { 934 cifs_dbg(VFS, "blob signature incorrect %s\n", 935 pblob->Signature); 936 return -EINVAL; 937 } 938 if (pblob->MessageType != NtLmChallenge) { 939 cifs_dbg(VFS, "Incorrect message type %d\n", 940 pblob->MessageType); 941 return -EINVAL; 942 } 943 944 server_flags = le32_to_cpu(pblob->NegotiateFlags); 945 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__, 946 ses->ntlmssp->client_flags, server_flags); 947 948 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) && 949 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) { 950 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n", 951 __func__); 952 return -EINVAL; 953 } 954 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) { 955 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__); 956 return -EINVAL; 957 } 958 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) { 959 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n", 960 __func__); 961 return -EOPNOTSUPP; 962 } 963 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) && 964 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH)) 965 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n", 966 __func__); 967 968 ses->ntlmssp->server_flags = server_flags; 969 970 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); 971 /* 972 * In particular we can examine sign flags 973 * 974 * BB spec says that if AvId field of MsvAvTimestamp is populated then 975 * we must set the MIC field of the AUTHENTICATE_MESSAGE 976 */ 977 978 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset); 979 tilen = le16_to_cpu(pblob->TargetInfoArray.Length); 980 if (tioffset > blob_len || tioffset + tilen > blob_len) { 981 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n", 982 tioffset, tilen); 983 return -EINVAL; 984 } 985 if (tilen) { 986 kfree_sensitive(ses->auth_key.response); 987 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen, 988 GFP_KERNEL); 989 if (!ses->auth_key.response) { 990 cifs_dbg(VFS, "Challenge target info alloc failure\n"); 991 return -ENOMEM; 992 } 993 ses->auth_key.len = tilen; 994 } 995 996 return 0; 997 } 998 999 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size) 1000 { 1001 int sz = base_size + ses->auth_key.len 1002 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2; 1003 1004 if (ses->domainName) 1005 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 1006 else 1007 sz += sizeof(__le16); 1008 1009 if (ses->user_name) 1010 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN); 1011 else 1012 sz += sizeof(__le16); 1013 1014 if (ses->workstation_name[0]) 1015 sz += sizeof(__le16) * strnlen(ses->workstation_name, 1016 ntlmssp_workstation_name_size(ses)); 1017 else 1018 sz += sizeof(__le16); 1019 1020 return sz; 1021 } 1022 1023 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf, 1024 char *str_value, 1025 int str_length, 1026 unsigned char *pstart, 1027 unsigned char **pcur, 1028 const struct nls_table *nls_cp) 1029 { 1030 unsigned char *tmp = pstart; 1031 int len; 1032 1033 if (!pbuf) 1034 return; 1035 1036 if (!pcur) 1037 pcur = &tmp; 1038 1039 if (!str_value) { 1040 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart); 1041 pbuf->Length = 0; 1042 pbuf->MaximumLength = 0; 1043 *pcur += sizeof(__le16); 1044 } else { 1045 len = cifs_strtoUTF16((__le16 *)*pcur, 1046 str_value, 1047 str_length, 1048 nls_cp); 1049 len *= sizeof(__le16); 1050 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart); 1051 pbuf->Length = cpu_to_le16(len); 1052 pbuf->MaximumLength = cpu_to_le16(len); 1053 *pcur += len; 1054 } 1055 } 1056 1057 /* BB Move to ntlmssp.c eventually */ 1058 1059 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer, 1060 u16 *buflen, 1061 struct cifs_ses *ses, 1062 struct TCP_Server_Info *server, 1063 const struct nls_table *nls_cp) 1064 { 1065 int rc = 0; 1066 NEGOTIATE_MESSAGE *sec_blob; 1067 __u32 flags; 1068 unsigned char *tmp; 1069 int len; 1070 1071 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE)); 1072 *pbuffer = kmalloc(len, GFP_KERNEL); 1073 if (!*pbuffer) { 1074 rc = -ENOMEM; 1075 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1076 *buflen = 0; 1077 goto setup_ntlm_neg_ret; 1078 } 1079 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer; 1080 1081 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE)); 1082 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1083 sec_blob->MessageType = NtLmNegotiate; 1084 1085 /* BB is NTLMV2 session security format easier to use here? */ 1086 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 1087 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 1088 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC | 1089 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL | 1090 NTLMSSP_NEGOTIATE_SIGN; 1091 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess) 1092 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 1093 1094 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE); 1095 ses->ntlmssp->client_flags = flags; 1096 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1097 1098 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */ 1099 cifs_security_buffer_from_str(&sec_blob->DomainName, 1100 NULL, 1101 CIFS_MAX_DOMAINNAME_LEN, 1102 *pbuffer, &tmp, 1103 nls_cp); 1104 1105 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1106 NULL, 1107 CIFS_MAX_WORKSTATION_LEN, 1108 *pbuffer, &tmp, 1109 nls_cp); 1110 1111 *buflen = tmp - *pbuffer; 1112 setup_ntlm_neg_ret: 1113 return rc; 1114 } 1115 1116 /* 1117 * Build ntlmssp blob with additional fields, such as version, 1118 * supported by modern servers. For safety limit to SMB3 or later 1119 * See notes in MS-NLMP Section 2.2.2.1 e.g. 1120 */ 1121 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer, 1122 u16 *buflen, 1123 struct cifs_ses *ses, 1124 struct TCP_Server_Info *server, 1125 const struct nls_table *nls_cp) 1126 { 1127 int rc = 0; 1128 struct negotiate_message *sec_blob; 1129 __u32 flags; 1130 unsigned char *tmp; 1131 int len; 1132 1133 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message)); 1134 *pbuffer = kmalloc(len, GFP_KERNEL); 1135 if (!*pbuffer) { 1136 rc = -ENOMEM; 1137 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1138 *buflen = 0; 1139 goto setup_ntlm_smb3_neg_ret; 1140 } 1141 sec_blob = (struct negotiate_message *)*pbuffer; 1142 1143 memset(*pbuffer, 0, sizeof(struct negotiate_message)); 1144 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1145 sec_blob->MessageType = NtLmNegotiate; 1146 1147 /* BB is NTLMV2 session security format easier to use here? */ 1148 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 1149 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 1150 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC | 1151 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL | 1152 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION; 1153 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess) 1154 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 1155 1156 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR; 1157 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL; 1158 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD); 1159 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3; 1160 1161 tmp = *pbuffer + sizeof(struct negotiate_message); 1162 ses->ntlmssp->client_flags = flags; 1163 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1164 1165 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */ 1166 cifs_security_buffer_from_str(&sec_blob->DomainName, 1167 NULL, 1168 CIFS_MAX_DOMAINNAME_LEN, 1169 *pbuffer, &tmp, 1170 nls_cp); 1171 1172 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1173 NULL, 1174 CIFS_MAX_WORKSTATION_LEN, 1175 *pbuffer, &tmp, 1176 nls_cp); 1177 1178 *buflen = tmp - *pbuffer; 1179 setup_ntlm_smb3_neg_ret: 1180 return rc; 1181 } 1182 1183 1184 /* See MS-NLMP 2.2.1.3 */ 1185 int build_ntlmssp_auth_blob(unsigned char **pbuffer, 1186 u16 *buflen, 1187 struct cifs_ses *ses, 1188 struct TCP_Server_Info *server, 1189 const struct nls_table *nls_cp) 1190 { 1191 int rc; 1192 AUTHENTICATE_MESSAGE *sec_blob; 1193 __u32 flags; 1194 unsigned char *tmp; 1195 int len; 1196 1197 rc = setup_ntlmv2_rsp(ses, nls_cp); 1198 if (rc) { 1199 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc); 1200 *buflen = 0; 1201 goto setup_ntlmv2_ret; 1202 } 1203 1204 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE)); 1205 *pbuffer = kmalloc(len, GFP_KERNEL); 1206 if (!*pbuffer) { 1207 rc = -ENOMEM; 1208 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1209 *buflen = 0; 1210 goto setup_ntlmv2_ret; 1211 } 1212 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer; 1213 1214 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1215 sec_blob->MessageType = NtLmAuthenticate; 1216 1217 /* send version information in ntlmssp authenticate also */ 1218 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET | 1219 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_VERSION | 1220 NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED; 1221 1222 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR; 1223 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL; 1224 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD); 1225 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3; 1226 1227 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE); 1228 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1229 1230 sec_blob->LmChallengeResponse.BufferOffset = 1231 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); 1232 sec_blob->LmChallengeResponse.Length = 0; 1233 sec_blob->LmChallengeResponse.MaximumLength = 0; 1234 1235 sec_blob->NtChallengeResponse.BufferOffset = 1236 cpu_to_le32(tmp - *pbuffer); 1237 if (ses->user_name != NULL) { 1238 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 1239 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1240 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 1241 1242 sec_blob->NtChallengeResponse.Length = 1243 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1244 sec_blob->NtChallengeResponse.MaximumLength = 1245 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1246 } else { 1247 /* 1248 * don't send an NT Response for anonymous access 1249 */ 1250 sec_blob->NtChallengeResponse.Length = 0; 1251 sec_blob->NtChallengeResponse.MaximumLength = 0; 1252 } 1253 1254 cifs_security_buffer_from_str(&sec_blob->DomainName, 1255 ses->domainName, 1256 CIFS_MAX_DOMAINNAME_LEN, 1257 *pbuffer, &tmp, 1258 nls_cp); 1259 1260 cifs_security_buffer_from_str(&sec_blob->UserName, 1261 ses->user_name, 1262 CIFS_MAX_USERNAME_LEN, 1263 *pbuffer, &tmp, 1264 nls_cp); 1265 1266 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1267 ses->workstation_name, 1268 ntlmssp_workstation_name_size(ses), 1269 *pbuffer, &tmp, 1270 nls_cp); 1271 1272 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) && 1273 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) && 1274 !calc_seckey(ses)) { 1275 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); 1276 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); 1277 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE); 1278 sec_blob->SessionKey.MaximumLength = 1279 cpu_to_le16(CIFS_CPHTXT_SIZE); 1280 tmp += CIFS_CPHTXT_SIZE; 1281 } else { 1282 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); 1283 sec_blob->SessionKey.Length = 0; 1284 sec_blob->SessionKey.MaximumLength = 0; 1285 } 1286 1287 *buflen = tmp - *pbuffer; 1288 setup_ntlmv2_ret: 1289 return rc; 1290 } 1291 1292 enum securityEnum 1293 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) 1294 { 1295 switch (server->negflavor) { 1296 case CIFS_NEGFLAVOR_EXTENDED: 1297 switch (requested) { 1298 case Kerberos: 1299 case RawNTLMSSP: 1300 return requested; 1301 case Unspecified: 1302 if (server->sec_ntlmssp && 1303 (global_secflags & CIFSSEC_MAY_NTLMSSP)) 1304 return RawNTLMSSP; 1305 if ((server->sec_kerberos || server->sec_mskerberos) && 1306 (global_secflags & CIFSSEC_MAY_KRB5)) 1307 return Kerberos; 1308 fallthrough; 1309 default: 1310 return Unspecified; 1311 } 1312 case CIFS_NEGFLAVOR_UNENCAP: 1313 switch (requested) { 1314 case NTLMv2: 1315 return requested; 1316 case Unspecified: 1317 if (global_secflags & CIFSSEC_MAY_NTLMV2) 1318 return NTLMv2; 1319 break; 1320 default: 1321 break; 1322 } 1323 fallthrough; 1324 default: 1325 return Unspecified; 1326 } 1327 } 1328 1329 struct sess_data { 1330 unsigned int xid; 1331 struct cifs_ses *ses; 1332 struct TCP_Server_Info *server; 1333 struct nls_table *nls_cp; 1334 void (*func)(struct sess_data *); 1335 int result; 1336 1337 /* we will send the SMB in three pieces: 1338 * a fixed length beginning part, an optional 1339 * SPNEGO blob (which can be zero length), and a 1340 * last part which will include the strings 1341 * and rest of bcc area. This allows us to avoid 1342 * a large buffer 17K allocation 1343 */ 1344 int buf0_type; 1345 struct kvec iov[3]; 1346 }; 1347 1348 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1349 static int 1350 sess_alloc_buffer(struct sess_data *sess_data, int wct) 1351 { 1352 int rc; 1353 struct cifs_ses *ses = sess_data->ses; 1354 struct smb_hdr *smb_buf; 1355 1356 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, 1357 (void **)&smb_buf); 1358 1359 if (rc) 1360 return rc; 1361 1362 sess_data->iov[0].iov_base = (char *)smb_buf; 1363 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; 1364 /* 1365 * This variable will be used to clear the buffer 1366 * allocated above in case of any error in the calling function. 1367 */ 1368 sess_data->buf0_type = CIFS_SMALL_BUFFER; 1369 1370 /* 2000 big enough to fit max user, domain, NOS name etc. */ 1371 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL); 1372 if (!sess_data->iov[2].iov_base) { 1373 rc = -ENOMEM; 1374 goto out_free_smb_buf; 1375 } 1376 1377 return 0; 1378 1379 out_free_smb_buf: 1380 cifs_small_buf_release(smb_buf); 1381 sess_data->iov[0].iov_base = NULL; 1382 sess_data->iov[0].iov_len = 0; 1383 sess_data->buf0_type = CIFS_NO_BUFFER; 1384 return rc; 1385 } 1386 1387 static void 1388 sess_free_buffer(struct sess_data *sess_data) 1389 { 1390 struct kvec *iov = sess_data->iov; 1391 1392 /* 1393 * Zero the session data before freeing, as it might contain sensitive info (keys, etc). 1394 * Note that iov[1] is already freed by caller. 1395 */ 1396 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base) 1397 memzero_explicit(iov[0].iov_base, iov[0].iov_len); 1398 1399 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base); 1400 sess_data->buf0_type = CIFS_NO_BUFFER; 1401 kfree_sensitive(iov[2].iov_base); 1402 } 1403 1404 static int 1405 sess_establish_session(struct sess_data *sess_data) 1406 { 1407 struct cifs_ses *ses = sess_data->ses; 1408 struct TCP_Server_Info *server = sess_data->server; 1409 1410 cifs_server_lock(server); 1411 if (!server->session_estab) { 1412 if (server->sign) { 1413 server->session_key.response = 1414 kmemdup(ses->auth_key.response, 1415 ses->auth_key.len, GFP_KERNEL); 1416 if (!server->session_key.response) { 1417 cifs_server_unlock(server); 1418 return -ENOMEM; 1419 } 1420 server->session_key.len = 1421 ses->auth_key.len; 1422 } 1423 server->sequence_number = 0x2; 1424 server->session_estab = true; 1425 } 1426 cifs_server_unlock(server); 1427 1428 cifs_dbg(FYI, "CIFS session established successfully\n"); 1429 return 0; 1430 } 1431 1432 static int 1433 sess_sendreceive(struct sess_data *sess_data) 1434 { 1435 int rc; 1436 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base; 1437 __u16 count; 1438 struct kvec rsp_iov = { NULL, 0 }; 1439 1440 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len; 1441 be32_add_cpu(&smb_buf->smb_buf_length, count); 1442 put_bcc(count, smb_buf); 1443 1444 rc = SendReceive2(sess_data->xid, sess_data->ses, 1445 sess_data->iov, 3 /* num_iovecs */, 1446 &sess_data->buf0_type, 1447 CIFS_LOG_ERROR, &rsp_iov); 1448 cifs_small_buf_release(sess_data->iov[0].iov_base); 1449 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); 1450 1451 return rc; 1452 } 1453 1454 static void 1455 sess_auth_ntlmv2(struct sess_data *sess_data) 1456 { 1457 int rc = 0; 1458 struct smb_hdr *smb_buf; 1459 SESSION_SETUP_ANDX *pSMB; 1460 char *bcc_ptr; 1461 struct cifs_ses *ses = sess_data->ses; 1462 struct TCP_Server_Info *server = sess_data->server; 1463 __u32 capabilities; 1464 __u16 bytes_remaining; 1465 1466 /* old style NTLM sessionsetup */ 1467 /* wct = 13 */ 1468 rc = sess_alloc_buffer(sess_data, 13); 1469 if (rc) 1470 goto out; 1471 1472 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1473 bcc_ptr = sess_data->iov[2].iov_base; 1474 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1475 1476 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 1477 1478 /* LM2 password would be here if we supported it */ 1479 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; 1480 1481 if (ses->user_name != NULL) { 1482 /* calculate nlmv2 response and session key */ 1483 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp); 1484 if (rc) { 1485 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc); 1486 goto out; 1487 } 1488 1489 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 1490 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1491 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 1492 1493 /* set case sensitive password length after tilen may get 1494 * assigned, tilen is 0 otherwise. 1495 */ 1496 pSMB->req_no_secext.CaseSensitivePasswordLength = 1497 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1498 } else { 1499 pSMB->req_no_secext.CaseSensitivePasswordLength = 0; 1500 } 1501 1502 if (ses->capabilities & CAP_UNICODE) { 1503 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) { 1504 *bcc_ptr = 0; 1505 bcc_ptr++; 1506 } 1507 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1508 } else { 1509 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1510 } 1511 1512 1513 sess_data->iov[2].iov_len = (long) bcc_ptr - 1514 (long) sess_data->iov[2].iov_base; 1515 1516 rc = sess_sendreceive(sess_data); 1517 if (rc) 1518 goto out; 1519 1520 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1521 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1522 1523 if (smb_buf->WordCount != 3) { 1524 rc = -EIO; 1525 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1526 goto out; 1527 } 1528 1529 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1530 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1531 1532 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1533 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1534 1535 bytes_remaining = get_bcc(smb_buf); 1536 bcc_ptr = pByteArea(smb_buf); 1537 1538 /* BB check if Unicode and decode strings */ 1539 if (bytes_remaining == 0) { 1540 /* no string area to decode, do nothing */ 1541 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1542 /* unicode string area must be word-aligned */ 1543 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1544 ++bcc_ptr; 1545 --bytes_remaining; 1546 } 1547 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1548 sess_data->nls_cp); 1549 } else { 1550 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1551 sess_data->nls_cp); 1552 } 1553 1554 rc = sess_establish_session(sess_data); 1555 out: 1556 sess_data->result = rc; 1557 sess_data->func = NULL; 1558 sess_free_buffer(sess_data); 1559 kfree_sensitive(ses->auth_key.response); 1560 ses->auth_key.response = NULL; 1561 } 1562 1563 #ifdef CONFIG_CIFS_UPCALL 1564 static void 1565 sess_auth_kerberos(struct sess_data *sess_data) 1566 { 1567 int rc = 0; 1568 struct smb_hdr *smb_buf; 1569 SESSION_SETUP_ANDX *pSMB; 1570 char *bcc_ptr; 1571 struct cifs_ses *ses = sess_data->ses; 1572 struct TCP_Server_Info *server = sess_data->server; 1573 __u32 capabilities; 1574 __u16 bytes_remaining; 1575 struct key *spnego_key = NULL; 1576 struct cifs_spnego_msg *msg; 1577 u16 blob_len; 1578 1579 /* extended security */ 1580 /* wct = 12 */ 1581 rc = sess_alloc_buffer(sess_data, 12); 1582 if (rc) 1583 goto out; 1584 1585 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1586 bcc_ptr = sess_data->iov[2].iov_base; 1587 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1588 1589 spnego_key = cifs_get_spnego_key(ses, server); 1590 if (IS_ERR(spnego_key)) { 1591 rc = PTR_ERR(spnego_key); 1592 spnego_key = NULL; 1593 goto out; 1594 } 1595 1596 msg = spnego_key->payload.data[0]; 1597 /* 1598 * check version field to make sure that cifs.upcall is 1599 * sending us a response in an expected form 1600 */ 1601 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 1602 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n", 1603 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 1604 rc = -EKEYREJECTED; 1605 goto out_put_spnego_key; 1606 } 1607 1608 kfree_sensitive(ses->auth_key.response); 1609 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, 1610 GFP_KERNEL); 1611 if (!ses->auth_key.response) { 1612 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n", 1613 msg->sesskey_len); 1614 rc = -ENOMEM; 1615 goto out_put_spnego_key; 1616 } 1617 ses->auth_key.len = msg->sesskey_len; 1618 1619 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1620 capabilities |= CAP_EXTENDED_SECURITY; 1621 pSMB->req.Capabilities = cpu_to_le32(capabilities); 1622 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; 1623 sess_data->iov[1].iov_len = msg->secblob_len; 1624 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len); 1625 1626 if (ses->capabilities & CAP_UNICODE) { 1627 /* unicode strings must be word aligned */ 1628 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1629 *bcc_ptr = 0; 1630 bcc_ptr++; 1631 } 1632 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1633 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp); 1634 } else { 1635 /* BB: is this right? */ 1636 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1637 } 1638 1639 sess_data->iov[2].iov_len = (long) bcc_ptr - 1640 (long) sess_data->iov[2].iov_base; 1641 1642 rc = sess_sendreceive(sess_data); 1643 if (rc) 1644 goto out_put_spnego_key; 1645 1646 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1647 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1648 1649 if (smb_buf->WordCount != 4) { 1650 rc = -EIO; 1651 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1652 goto out_put_spnego_key; 1653 } 1654 1655 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1656 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1657 1658 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1659 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1660 1661 bytes_remaining = get_bcc(smb_buf); 1662 bcc_ptr = pByteArea(smb_buf); 1663 1664 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1665 if (blob_len > bytes_remaining) { 1666 cifs_dbg(VFS, "bad security blob length %d\n", 1667 blob_len); 1668 rc = -EINVAL; 1669 goto out_put_spnego_key; 1670 } 1671 bcc_ptr += blob_len; 1672 bytes_remaining -= blob_len; 1673 1674 /* BB check if Unicode and decode strings */ 1675 if (bytes_remaining == 0) { 1676 /* no string area to decode, do nothing */ 1677 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1678 /* unicode string area must be word-aligned */ 1679 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1680 ++bcc_ptr; 1681 --bytes_remaining; 1682 } 1683 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1684 sess_data->nls_cp); 1685 } else { 1686 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1687 sess_data->nls_cp); 1688 } 1689 1690 rc = sess_establish_session(sess_data); 1691 out_put_spnego_key: 1692 key_invalidate(spnego_key); 1693 key_put(spnego_key); 1694 out: 1695 sess_data->result = rc; 1696 sess_data->func = NULL; 1697 sess_free_buffer(sess_data); 1698 kfree_sensitive(ses->auth_key.response); 1699 ses->auth_key.response = NULL; 1700 } 1701 1702 #endif /* ! CONFIG_CIFS_UPCALL */ 1703 1704 /* 1705 * The required kvec buffers have to be allocated before calling this 1706 * function. 1707 */ 1708 static int 1709 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data) 1710 { 1711 SESSION_SETUP_ANDX *pSMB; 1712 struct cifs_ses *ses = sess_data->ses; 1713 struct TCP_Server_Info *server = sess_data->server; 1714 __u32 capabilities; 1715 char *bcc_ptr; 1716 1717 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1718 1719 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1720 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { 1721 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n"); 1722 return -ENOSYS; 1723 } 1724 1725 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1726 capabilities |= CAP_EXTENDED_SECURITY; 1727 pSMB->req.Capabilities |= cpu_to_le32(capabilities); 1728 1729 bcc_ptr = sess_data->iov[2].iov_base; 1730 /* unicode strings must be word aligned */ 1731 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1732 *bcc_ptr = 0; 1733 bcc_ptr++; 1734 } 1735 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1736 1737 sess_data->iov[2].iov_len = (long) bcc_ptr - 1738 (long) sess_data->iov[2].iov_base; 1739 1740 return 0; 1741 } 1742 1743 static void 1744 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data); 1745 1746 static void 1747 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data) 1748 { 1749 int rc; 1750 struct smb_hdr *smb_buf; 1751 SESSION_SETUP_ANDX *pSMB; 1752 struct cifs_ses *ses = sess_data->ses; 1753 struct TCP_Server_Info *server = sess_data->server; 1754 __u16 bytes_remaining; 1755 char *bcc_ptr; 1756 unsigned char *ntlmsspblob = NULL; 1757 u16 blob_len; 1758 1759 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n"); 1760 1761 /* 1762 * if memory allocation is successful, caller of this function 1763 * frees it. 1764 */ 1765 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); 1766 if (!ses->ntlmssp) { 1767 rc = -ENOMEM; 1768 goto out; 1769 } 1770 ses->ntlmssp->sesskey_per_smbsess = false; 1771 1772 /* wct = 12 */ 1773 rc = sess_alloc_buffer(sess_data, 12); 1774 if (rc) 1775 goto out; 1776 1777 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1778 1779 /* Build security blob before we assemble the request */ 1780 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob, 1781 &blob_len, ses, server, 1782 sess_data->nls_cp); 1783 if (rc) 1784 goto out_free_ntlmsspblob; 1785 1786 sess_data->iov[1].iov_len = blob_len; 1787 sess_data->iov[1].iov_base = ntlmsspblob; 1788 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1789 1790 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1791 if (rc) 1792 goto out_free_ntlmsspblob; 1793 1794 rc = sess_sendreceive(sess_data); 1795 1796 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1797 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1798 1799 /* If true, rc here is expected and not an error */ 1800 if (sess_data->buf0_type != CIFS_NO_BUFFER && 1801 smb_buf->Status.CifsError == 1802 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)) 1803 rc = 0; 1804 1805 if (rc) 1806 goto out_free_ntlmsspblob; 1807 1808 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); 1809 1810 if (smb_buf->WordCount != 4) { 1811 rc = -EIO; 1812 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1813 goto out_free_ntlmsspblob; 1814 } 1815 1816 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1817 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1818 1819 bytes_remaining = get_bcc(smb_buf); 1820 bcc_ptr = pByteArea(smb_buf); 1821 1822 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1823 if (blob_len > bytes_remaining) { 1824 cifs_dbg(VFS, "bad security blob length %d\n", 1825 blob_len); 1826 rc = -EINVAL; 1827 goto out_free_ntlmsspblob; 1828 } 1829 1830 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); 1831 1832 out_free_ntlmsspblob: 1833 kfree_sensitive(ntlmsspblob); 1834 out: 1835 sess_free_buffer(sess_data); 1836 1837 if (!rc) { 1838 sess_data->func = sess_auth_rawntlmssp_authenticate; 1839 return; 1840 } 1841 1842 /* Else error. Cleanup */ 1843 kfree_sensitive(ses->auth_key.response); 1844 ses->auth_key.response = NULL; 1845 kfree_sensitive(ses->ntlmssp); 1846 ses->ntlmssp = NULL; 1847 1848 sess_data->func = NULL; 1849 sess_data->result = rc; 1850 } 1851 1852 static void 1853 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data) 1854 { 1855 int rc; 1856 struct smb_hdr *smb_buf; 1857 SESSION_SETUP_ANDX *pSMB; 1858 struct cifs_ses *ses = sess_data->ses; 1859 struct TCP_Server_Info *server = sess_data->server; 1860 __u16 bytes_remaining; 1861 char *bcc_ptr; 1862 unsigned char *ntlmsspblob = NULL; 1863 u16 blob_len; 1864 1865 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n"); 1866 1867 /* wct = 12 */ 1868 rc = sess_alloc_buffer(sess_data, 12); 1869 if (rc) 1870 goto out; 1871 1872 /* Build security blob before we assemble the request */ 1873 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1874 smb_buf = (struct smb_hdr *)pSMB; 1875 rc = build_ntlmssp_auth_blob(&ntlmsspblob, 1876 &blob_len, ses, server, 1877 sess_data->nls_cp); 1878 if (rc) 1879 goto out_free_ntlmsspblob; 1880 sess_data->iov[1].iov_len = blob_len; 1881 sess_data->iov[1].iov_base = ntlmsspblob; 1882 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1883 /* 1884 * Make sure that we tell the server that we are using 1885 * the uid that it just gave us back on the response 1886 * (challenge) 1887 */ 1888 smb_buf->Uid = ses->Suid; 1889 1890 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1891 if (rc) 1892 goto out_free_ntlmsspblob; 1893 1894 rc = sess_sendreceive(sess_data); 1895 if (rc) 1896 goto out_free_ntlmsspblob; 1897 1898 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1899 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1900 if (smb_buf->WordCount != 4) { 1901 rc = -EIO; 1902 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1903 goto out_free_ntlmsspblob; 1904 } 1905 1906 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1907 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1908 1909 if (ses->Suid != smb_buf->Uid) { 1910 ses->Suid = smb_buf->Uid; 1911 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid); 1912 } 1913 1914 bytes_remaining = get_bcc(smb_buf); 1915 bcc_ptr = pByteArea(smb_buf); 1916 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1917 if (blob_len > bytes_remaining) { 1918 cifs_dbg(VFS, "bad security blob length %d\n", 1919 blob_len); 1920 rc = -EINVAL; 1921 goto out_free_ntlmsspblob; 1922 } 1923 bcc_ptr += blob_len; 1924 bytes_remaining -= blob_len; 1925 1926 1927 /* BB check if Unicode and decode strings */ 1928 if (bytes_remaining == 0) { 1929 /* no string area to decode, do nothing */ 1930 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1931 /* unicode string area must be word-aligned */ 1932 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1933 ++bcc_ptr; 1934 --bytes_remaining; 1935 } 1936 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1937 sess_data->nls_cp); 1938 } else { 1939 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1940 sess_data->nls_cp); 1941 } 1942 1943 out_free_ntlmsspblob: 1944 kfree_sensitive(ntlmsspblob); 1945 out: 1946 sess_free_buffer(sess_data); 1947 1948 if (!rc) 1949 rc = sess_establish_session(sess_data); 1950 1951 /* Cleanup */ 1952 kfree_sensitive(ses->auth_key.response); 1953 ses->auth_key.response = NULL; 1954 kfree_sensitive(ses->ntlmssp); 1955 ses->ntlmssp = NULL; 1956 1957 sess_data->func = NULL; 1958 sess_data->result = rc; 1959 } 1960 1961 static int select_sec(struct sess_data *sess_data) 1962 { 1963 int type; 1964 struct cifs_ses *ses = sess_data->ses; 1965 struct TCP_Server_Info *server = sess_data->server; 1966 1967 type = cifs_select_sectype(server, ses->sectype); 1968 cifs_dbg(FYI, "sess setup type %d\n", type); 1969 if (type == Unspecified) { 1970 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n"); 1971 return -EINVAL; 1972 } 1973 1974 switch (type) { 1975 case NTLMv2: 1976 sess_data->func = sess_auth_ntlmv2; 1977 break; 1978 case Kerberos: 1979 #ifdef CONFIG_CIFS_UPCALL 1980 sess_data->func = sess_auth_kerberos; 1981 break; 1982 #else 1983 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); 1984 return -ENOSYS; 1985 #endif /* CONFIG_CIFS_UPCALL */ 1986 case RawNTLMSSP: 1987 sess_data->func = sess_auth_rawntlmssp_negotiate; 1988 break; 1989 default: 1990 cifs_dbg(VFS, "secType %d not supported!\n", type); 1991 return -ENOSYS; 1992 } 1993 1994 return 0; 1995 } 1996 1997 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, 1998 struct TCP_Server_Info *server, 1999 const struct nls_table *nls_cp) 2000 { 2001 int rc = 0; 2002 struct sess_data *sess_data; 2003 2004 if (ses == NULL) { 2005 WARN(1, "%s: ses == NULL!", __func__); 2006 return -EINVAL; 2007 } 2008 2009 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL); 2010 if (!sess_data) 2011 return -ENOMEM; 2012 2013 sess_data->xid = xid; 2014 sess_data->ses = ses; 2015 sess_data->server = server; 2016 sess_data->buf0_type = CIFS_NO_BUFFER; 2017 sess_data->nls_cp = (struct nls_table *) nls_cp; 2018 2019 rc = select_sec(sess_data); 2020 if (rc) 2021 goto out; 2022 2023 while (sess_data->func) 2024 sess_data->func(sess_data); 2025 2026 /* Store result before we free sess_data */ 2027 rc = sess_data->result; 2028 2029 out: 2030 kfree_sensitive(sess_data); 2031 return rc; 2032 } 2033 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2034