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