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