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 } 449 450 static int 451 cifs_ses_add_channel(struct cifs_ses *ses, 452 struct cifs_server_iface *iface) 453 { 454 struct TCP_Server_Info *chan_server; 455 struct cifs_chan *chan; 456 struct smb3_fs_context *ctx; 457 static const char unc_fmt[] = "\\%s\\foo"; 458 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr; 459 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr; 460 size_t len; 461 int rc; 462 unsigned int xid = get_xid(); 463 464 if (iface->sockaddr.ss_family == AF_INET) 465 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n", 466 ses, iface->speed, str_yes_no(iface->rdma_capable), 467 &ipv4->sin_addr); 468 else 469 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n", 470 ses, iface->speed, str_yes_no(iface->rdma_capable), 471 &ipv6->sin6_addr); 472 473 /* 474 * Setup a ctx with mostly the same info as the existing 475 * session and overwrite it with the requested iface data. 476 * 477 * We need to setup at least the fields used for negprot and 478 * sesssetup. 479 * 480 * We only need the ctx here, so we can reuse memory from 481 * the session and server without caring about memory 482 * management. 483 */ 484 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 485 if (!ctx) { 486 rc = -ENOMEM; 487 goto out_free_xid; 488 } 489 490 /* Always make new connection for now (TODO?) */ 491 ctx->nosharesock = true; 492 493 /* Auth */ 494 ctx->domainauto = ses->domainAuto; 495 ctx->domainname = ses->domainName; 496 497 /* no hostname for extra channels */ 498 ctx->server_hostname = ""; 499 500 ctx->username = ses->user_name; 501 ctx->password = ses->password; 502 ctx->sectype = ses->sectype; 503 ctx->sign = ses->sign; 504 ctx->unicode = ses->unicode; 505 506 /* UNC and paths */ 507 /* XXX: Use ses->server->hostname? */ 508 len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL; 509 ctx->UNC = kzalloc(len, GFP_KERNEL); 510 if (!ctx->UNC) { 511 rc = -ENOMEM; 512 goto out_free_ctx; 513 } 514 scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr); 515 ctx->prepath = ""; 516 517 /* Reuse same version as master connection */ 518 ctx->vals = ses->server->vals; 519 ctx->ops = ses->server->ops; 520 521 ctx->noblocksnd = ses->server->noblocksnd; 522 ctx->noautotune = ses->server->noautotune; 523 ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay; 524 ctx->echo_interval = ses->server->echo_interval / HZ; 525 ctx->max_credits = ses->server->max_credits; 526 ctx->min_offload = ses->server->min_offload; 527 ctx->compress = ses->server->compression.requested; 528 ctx->dfs_conn = ses->server->dfs_conn; 529 ctx->ignore_signature = ses->server->ignore_signature; 530 ctx->leaf_fullpath = ses->server->leaf_fullpath; 531 ctx->rootfs = ses->server->noblockcnt; 532 ctx->retrans = ses->server->retrans; 533 534 /* 535 * This will be used for encoding/decoding user/domain/pw 536 * during sess setup auth. 537 */ 538 ctx->local_nls = ses->local_nls; 539 540 /* Use RDMA if possible */ 541 ctx->rdma = iface->rdma_capable; 542 memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr)); 543 544 /* reuse master con client guid */ 545 memcpy(&ctx->client_guid, ses->server->client_guid, 546 sizeof(ctx->client_guid)); 547 ctx->use_client_guid = true; 548 549 chan_server = cifs_get_tcp_session(ctx, ses->server); 550 551 spin_lock(&ses->chan_lock); 552 chan = &ses->chans[ses->chan_count]; 553 chan->server = chan_server; 554 if (IS_ERR(chan->server)) { 555 rc = PTR_ERR(chan->server); 556 chan->server = NULL; 557 spin_unlock(&ses->chan_lock); 558 goto out; 559 } 560 chan->iface = iface; 561 ses->chan_count++; 562 atomic_set(&ses->chan_seq, 0); 563 564 /* Mark this channel as needing connect/setup */ 565 cifs_chan_set_need_reconnect(ses, chan->server); 566 567 spin_unlock(&ses->chan_lock); 568 569 mutex_lock(&ses->session_mutex); 570 /* 571 * We need to allocate the server crypto now as we will need 572 * to sign packets before we generate the channel signing key 573 * (we sign with the session key) 574 */ 575 rc = smb311_crypto_shash_allocate(chan->server); 576 if (rc) { 577 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__); 578 mutex_unlock(&ses->session_mutex); 579 goto out; 580 } 581 582 rc = cifs_negotiate_protocol(xid, ses, chan->server); 583 if (!rc) 584 rc = cifs_setup_session(xid, ses, chan->server, ses->local_nls); 585 586 mutex_unlock(&ses->session_mutex); 587 588 out: 589 if (rc && chan->server) { 590 cifs_put_tcp_session(chan->server, 0); 591 592 spin_lock(&ses->chan_lock); 593 594 /* we rely on all bits beyond chan_count to be clear */ 595 cifs_chan_clear_need_reconnect(ses, chan->server); 596 ses->chan_count--; 597 /* 598 * chan_count should never reach 0 as at least the primary 599 * channel is always allocated 600 */ 601 WARN_ON(ses->chan_count < 1); 602 spin_unlock(&ses->chan_lock); 603 } 604 605 kfree(ctx->UNC); 606 out_free_ctx: 607 kfree(ctx); 608 out_free_xid: 609 free_xid(xid); 610 return rc; 611 } 612 613 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 614 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, 615 struct TCP_Server_Info *server, 616 SESSION_SETUP_ANDX *pSMB) 617 { 618 __u32 capabilities = 0; 619 620 /* init fields common to all four types of SessSetup */ 621 /* Note that offsets for first seven fields in req struct are same */ 622 /* in CIFS Specs so does not matter which of 3 forms of struct */ 623 /* that we use in next few lines */ 624 /* Note that header is initialized to zero in header_assemble */ 625 pSMB->req.AndXCommand = 0xFF; 626 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32, 627 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4, 628 USHRT_MAX)); 629 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq); 630 pSMB->req.VcNumber = cpu_to_le16(1); 631 632 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ 633 634 /* BB verify whether signing required on neg or just auth frame (and NTLM case) */ 635 636 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | 637 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; 638 639 if (server->sign) 640 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; 641 642 if (ses->capabilities & CAP_UNICODE) { 643 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; 644 capabilities |= CAP_UNICODE; 645 } 646 if (ses->capabilities & CAP_STATUS32) { 647 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; 648 capabilities |= CAP_STATUS32; 649 } 650 if (ses->capabilities & CAP_DFS) { 651 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; 652 capabilities |= CAP_DFS; 653 } 654 if (ses->capabilities & CAP_UNIX) 655 capabilities |= CAP_UNIX; 656 657 return capabilities; 658 } 659 660 static void 661 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) 662 { 663 char *bcc_ptr = *pbcc_area; 664 int bytes_ret = 0; 665 666 /* Copy OS version */ 667 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32, 668 nls_cp); 669 bcc_ptr += 2 * bytes_ret; 670 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release, 671 32, nls_cp); 672 bcc_ptr += 2 * bytes_ret; 673 bcc_ptr += 2; /* trailing null */ 674 675 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, 676 32, nls_cp); 677 bcc_ptr += 2 * bytes_ret; 678 bcc_ptr += 2; /* trailing null */ 679 680 *pbcc_area = bcc_ptr; 681 } 682 683 static void 684 ascii_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) 685 { 686 char *bcc_ptr = *pbcc_area; 687 688 strcpy(bcc_ptr, "Linux version "); 689 bcc_ptr += strlen("Linux version "); 690 strcpy(bcc_ptr, init_utsname()->release); 691 bcc_ptr += strlen(init_utsname()->release) + 1; 692 693 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); 694 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; 695 696 *pbcc_area = bcc_ptr; 697 } 698 699 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, 700 const struct nls_table *nls_cp) 701 { 702 char *bcc_ptr = *pbcc_area; 703 int bytes_ret = 0; 704 705 /* copy domain */ 706 if (ses->domainName == NULL) { 707 /* 708 * Sending null domain better than using a bogus domain name (as 709 * we did briefly in 2.6.18) since server will use its default 710 */ 711 *bcc_ptr = 0; 712 *(bcc_ptr+1) = 0; 713 bytes_ret = 0; 714 } else 715 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, 716 CIFS_MAX_DOMAINNAME_LEN, nls_cp); 717 bcc_ptr += 2 * bytes_ret; 718 bcc_ptr += 2; /* account for null terminator */ 719 720 *pbcc_area = bcc_ptr; 721 } 722 723 static void ascii_domain_string(char **pbcc_area, struct cifs_ses *ses, 724 const struct nls_table *nls_cp) 725 { 726 char *bcc_ptr = *pbcc_area; 727 int len; 728 729 /* copy domain */ 730 if (ses->domainName != NULL) { 731 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 732 if (WARN_ON_ONCE(len < 0)) 733 len = CIFS_MAX_DOMAINNAME_LEN - 1; 734 bcc_ptr += len; 735 } /* else we send a null domain name so server will default to its own domain */ 736 *bcc_ptr = 0; 737 bcc_ptr++; 738 739 *pbcc_area = bcc_ptr; 740 } 741 742 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 743 const struct nls_table *nls_cp) 744 { 745 char *bcc_ptr = *pbcc_area; 746 int bytes_ret = 0; 747 748 /* BB FIXME add check that strings less than 335 or will need to send as arrays */ 749 750 /* copy user */ 751 if (ses->user_name == NULL) { 752 /* null user mount */ 753 *bcc_ptr = 0; 754 *(bcc_ptr+1) = 0; 755 } else { 756 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name, 757 CIFS_MAX_USERNAME_LEN, nls_cp); 758 } 759 bcc_ptr += 2 * bytes_ret; 760 bcc_ptr += 2; /* account for null termination */ 761 762 unicode_domain_string(&bcc_ptr, ses, nls_cp); 763 unicode_oslm_strings(&bcc_ptr, nls_cp); 764 765 *pbcc_area = bcc_ptr; 766 } 767 768 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 769 const struct nls_table *nls_cp) 770 { 771 char *bcc_ptr = *pbcc_area; 772 int len; 773 774 /* copy user */ 775 /* BB what about null user mounts - check that we do this BB */ 776 /* copy user */ 777 if (ses->user_name != NULL) { 778 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN); 779 if (WARN_ON_ONCE(len < 0)) 780 len = CIFS_MAX_USERNAME_LEN - 1; 781 bcc_ptr += len; 782 } 783 /* else null user mount */ 784 *bcc_ptr = 0; 785 bcc_ptr++; /* account for null termination */ 786 787 /* BB check for overflow here */ 788 789 ascii_domain_string(&bcc_ptr, ses, nls_cp); 790 ascii_oslm_strings(&bcc_ptr, nls_cp); 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 case IAKerb: 1267 return requested; 1268 case Unspecified: 1269 if (server->sec_ntlmssp && 1270 (global_secflags & CIFSSEC_MAY_NTLMSSP)) 1271 return RawNTLMSSP; 1272 if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) && 1273 (global_secflags & CIFSSEC_MAY_KRB5)) 1274 return Kerberos; 1275 fallthrough; 1276 default: 1277 return Unspecified; 1278 } 1279 case CIFS_NEGFLAVOR_UNENCAP: 1280 switch (requested) { 1281 case NTLMv2: 1282 return requested; 1283 case Unspecified: 1284 if (global_secflags & CIFSSEC_MAY_NTLMV2) 1285 return NTLMv2; 1286 break; 1287 default: 1288 break; 1289 } 1290 fallthrough; 1291 default: 1292 return Unspecified; 1293 } 1294 } 1295 1296 struct sess_data { 1297 unsigned int xid; 1298 struct cifs_ses *ses; 1299 struct TCP_Server_Info *server; 1300 struct nls_table *nls_cp; 1301 void (*func)(struct sess_data *); 1302 int result; 1303 1304 /* we will send the SMB in three pieces: 1305 * a fixed length beginning part, an optional 1306 * SPNEGO blob (which can be zero length), and a 1307 * last part which will include the strings 1308 * and rest of bcc area. This allows us to avoid 1309 * a large buffer 17K allocation 1310 */ 1311 int buf0_type; 1312 struct kvec iov[3]; 1313 }; 1314 1315 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1316 static int 1317 sess_alloc_buffer(struct sess_data *sess_data, int wct) 1318 { 1319 int rc; 1320 struct cifs_ses *ses = sess_data->ses; 1321 struct smb_hdr *smb_buf; 1322 1323 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, 1324 (void **)&smb_buf); 1325 1326 if (rc) 1327 return rc; 1328 1329 sess_data->iov[0].iov_base = (char *)smb_buf; 1330 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; 1331 /* 1332 * This variable will be used to clear the buffer 1333 * allocated above in case of any error in the calling function. 1334 */ 1335 sess_data->buf0_type = CIFS_SMALL_BUFFER; 1336 1337 /* 2000 big enough to fit max user, domain, NOS name etc. */ 1338 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL); 1339 if (!sess_data->iov[2].iov_base) { 1340 rc = -ENOMEM; 1341 goto out_free_smb_buf; 1342 } 1343 1344 return 0; 1345 1346 out_free_smb_buf: 1347 cifs_small_buf_release(smb_buf); 1348 sess_data->iov[0].iov_base = NULL; 1349 sess_data->iov[0].iov_len = 0; 1350 sess_data->buf0_type = CIFS_NO_BUFFER; 1351 return rc; 1352 } 1353 1354 static void 1355 sess_free_buffer(struct sess_data *sess_data) 1356 { 1357 struct kvec *iov = sess_data->iov; 1358 1359 /* 1360 * Zero the session data before freeing, as it might contain sensitive info (keys, etc). 1361 * Note that iov[1] is already freed by caller. 1362 */ 1363 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base) 1364 memzero_explicit(iov[0].iov_base, iov[0].iov_len); 1365 1366 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base); 1367 sess_data->buf0_type = CIFS_NO_BUFFER; 1368 kfree_sensitive(iov[2].iov_base); 1369 } 1370 1371 static int 1372 sess_establish_session(struct sess_data *sess_data) 1373 { 1374 struct cifs_ses *ses = sess_data->ses; 1375 struct TCP_Server_Info *server = sess_data->server; 1376 1377 cifs_server_lock(server); 1378 if (!server->session_estab) { 1379 if (server->sign) { 1380 server->session_key.response = 1381 kmemdup(ses->auth_key.response, 1382 ses->auth_key.len, GFP_KERNEL); 1383 if (!server->session_key.response) { 1384 cifs_server_unlock(server); 1385 return -ENOMEM; 1386 } 1387 server->session_key.len = 1388 ses->auth_key.len; 1389 } 1390 server->sequence_number = 0x2; 1391 server->session_estab = true; 1392 } 1393 cifs_server_unlock(server); 1394 1395 cifs_dbg(FYI, "CIFS session established successfully\n"); 1396 return 0; 1397 } 1398 1399 static int 1400 sess_sendreceive(struct sess_data *sess_data) 1401 { 1402 int rc; 1403 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base; 1404 __u16 count; 1405 struct kvec rsp_iov = { NULL, 0 }; 1406 1407 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len; 1408 be32_add_cpu(&smb_buf->smb_buf_length, count); 1409 put_bcc(count, smb_buf); 1410 1411 rc = SendReceive2(sess_data->xid, sess_data->ses, 1412 sess_data->iov, 3 /* num_iovecs */, 1413 &sess_data->buf0_type, 1414 CIFS_LOG_ERROR, &rsp_iov); 1415 cifs_small_buf_release(sess_data->iov[0].iov_base); 1416 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); 1417 1418 return rc; 1419 } 1420 1421 static void 1422 sess_auth_ntlmv2(struct sess_data *sess_data) 1423 { 1424 int rc = 0; 1425 struct smb_hdr *smb_buf; 1426 SESSION_SETUP_ANDX *pSMB; 1427 char *bcc_ptr; 1428 struct cifs_ses *ses = sess_data->ses; 1429 struct TCP_Server_Info *server = sess_data->server; 1430 __u32 capabilities; 1431 __u16 bytes_remaining; 1432 1433 /* old style NTLM sessionsetup */ 1434 /* wct = 13 */ 1435 rc = sess_alloc_buffer(sess_data, 13); 1436 if (rc) 1437 goto out; 1438 1439 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1440 bcc_ptr = sess_data->iov[2].iov_base; 1441 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1442 1443 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 1444 1445 /* LM2 password would be here if we supported it */ 1446 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; 1447 1448 if (ses->user_name != NULL) { 1449 /* calculate nlmv2 response and session key */ 1450 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp); 1451 if (rc) { 1452 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc); 1453 goto out; 1454 } 1455 1456 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 1457 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1458 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 1459 1460 /* set case sensitive password length after tilen may get 1461 * assigned, tilen is 0 otherwise. 1462 */ 1463 pSMB->req_no_secext.CaseSensitivePasswordLength = 1464 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1465 } else { 1466 pSMB->req_no_secext.CaseSensitivePasswordLength = 0; 1467 } 1468 1469 if (ses->capabilities & CAP_UNICODE) { 1470 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) { 1471 *bcc_ptr = 0; 1472 bcc_ptr++; 1473 } 1474 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1475 } else { 1476 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1477 } 1478 1479 1480 sess_data->iov[2].iov_len = (long) bcc_ptr - 1481 (long) sess_data->iov[2].iov_base; 1482 1483 rc = sess_sendreceive(sess_data); 1484 if (rc) 1485 goto out; 1486 1487 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1488 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1489 1490 if (smb_buf->WordCount != 3) { 1491 rc = -EIO; 1492 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1493 goto out; 1494 } 1495 1496 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1497 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1498 1499 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1500 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1501 1502 bytes_remaining = get_bcc(smb_buf); 1503 bcc_ptr = pByteArea(smb_buf); 1504 1505 /* BB check if Unicode and decode strings */ 1506 if (bytes_remaining == 0) { 1507 /* no string area to decode, do nothing */ 1508 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1509 /* unicode string area must be word-aligned */ 1510 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1511 ++bcc_ptr; 1512 --bytes_remaining; 1513 } 1514 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1515 sess_data->nls_cp); 1516 } else { 1517 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1518 sess_data->nls_cp); 1519 } 1520 1521 rc = sess_establish_session(sess_data); 1522 out: 1523 sess_data->result = rc; 1524 sess_data->func = NULL; 1525 sess_free_buffer(sess_data); 1526 kfree_sensitive(ses->auth_key.response); 1527 ses->auth_key.response = NULL; 1528 } 1529 1530 #ifdef CONFIG_CIFS_UPCALL 1531 static void 1532 sess_auth_kerberos(struct sess_data *sess_data) 1533 { 1534 int rc = 0; 1535 struct smb_hdr *smb_buf; 1536 SESSION_SETUP_ANDX *pSMB; 1537 char *bcc_ptr; 1538 struct cifs_ses *ses = sess_data->ses; 1539 struct TCP_Server_Info *server = sess_data->server; 1540 __u32 capabilities; 1541 __u16 bytes_remaining; 1542 struct key *spnego_key = NULL; 1543 struct cifs_spnego_msg *msg; 1544 u16 blob_len; 1545 1546 /* extended security */ 1547 /* wct = 12 */ 1548 rc = sess_alloc_buffer(sess_data, 12); 1549 if (rc) 1550 goto out; 1551 1552 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1553 bcc_ptr = sess_data->iov[2].iov_base; 1554 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1555 1556 spnego_key = cifs_get_spnego_key(ses, server); 1557 if (IS_ERR(spnego_key)) { 1558 rc = PTR_ERR(spnego_key); 1559 spnego_key = NULL; 1560 goto out; 1561 } 1562 1563 msg = spnego_key->payload.data[0]; 1564 /* 1565 * check version field to make sure that cifs.upcall is 1566 * sending us a response in an expected form 1567 */ 1568 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 1569 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n", 1570 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 1571 rc = -EKEYREJECTED; 1572 goto out_put_spnego_key; 1573 } 1574 1575 kfree_sensitive(ses->auth_key.response); 1576 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, 1577 GFP_KERNEL); 1578 if (!ses->auth_key.response) { 1579 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n", 1580 msg->sesskey_len); 1581 rc = -ENOMEM; 1582 goto out_put_spnego_key; 1583 } 1584 ses->auth_key.len = msg->sesskey_len; 1585 1586 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1587 capabilities |= CAP_EXTENDED_SECURITY; 1588 pSMB->req.Capabilities = cpu_to_le32(capabilities); 1589 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; 1590 sess_data->iov[1].iov_len = msg->secblob_len; 1591 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len); 1592 1593 if (pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) { 1594 /* unicode strings must be word aligned */ 1595 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1596 *bcc_ptr = 0; 1597 bcc_ptr++; 1598 } 1599 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1600 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp); 1601 } else { 1602 ascii_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1603 ascii_domain_string(&bcc_ptr, ses, sess_data->nls_cp); 1604 } 1605 1606 sess_data->iov[2].iov_len = (long) bcc_ptr - 1607 (long) sess_data->iov[2].iov_base; 1608 1609 rc = sess_sendreceive(sess_data); 1610 if (rc) 1611 goto out_put_spnego_key; 1612 1613 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1614 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1615 1616 if (smb_buf->WordCount != 4) { 1617 rc = -EIO; 1618 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1619 goto out_put_spnego_key; 1620 } 1621 1622 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1623 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1624 1625 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1626 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1627 1628 bytes_remaining = get_bcc(smb_buf); 1629 bcc_ptr = pByteArea(smb_buf); 1630 1631 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1632 if (blob_len > bytes_remaining) { 1633 cifs_dbg(VFS, "bad security blob length %d\n", 1634 blob_len); 1635 rc = -EINVAL; 1636 goto out_put_spnego_key; 1637 } 1638 bcc_ptr += blob_len; 1639 bytes_remaining -= blob_len; 1640 1641 /* BB check if Unicode and decode strings */ 1642 if (bytes_remaining == 0) { 1643 /* no string area to decode, do nothing */ 1644 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1645 /* unicode string area must be word-aligned */ 1646 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1647 ++bcc_ptr; 1648 --bytes_remaining; 1649 } 1650 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1651 sess_data->nls_cp); 1652 } else { 1653 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1654 sess_data->nls_cp); 1655 } 1656 1657 rc = sess_establish_session(sess_data); 1658 out_put_spnego_key: 1659 key_invalidate(spnego_key); 1660 key_put(spnego_key); 1661 out: 1662 sess_data->result = rc; 1663 sess_data->func = NULL; 1664 sess_free_buffer(sess_data); 1665 kfree_sensitive(ses->auth_key.response); 1666 ses->auth_key.response = NULL; 1667 } 1668 1669 #endif /* ! CONFIG_CIFS_UPCALL */ 1670 1671 /* 1672 * The required kvec buffers have to be allocated before calling this 1673 * function. 1674 */ 1675 static int 1676 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data) 1677 { 1678 SESSION_SETUP_ANDX *pSMB; 1679 struct cifs_ses *ses = sess_data->ses; 1680 struct TCP_Server_Info *server = sess_data->server; 1681 __u32 capabilities; 1682 char *bcc_ptr; 1683 1684 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1685 1686 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1687 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { 1688 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n"); 1689 return -ENOSYS; 1690 } 1691 1692 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1693 capabilities |= CAP_EXTENDED_SECURITY; 1694 pSMB->req.Capabilities |= cpu_to_le32(capabilities); 1695 1696 bcc_ptr = sess_data->iov[2].iov_base; 1697 /* unicode strings must be word aligned */ 1698 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1699 *bcc_ptr = 0; 1700 bcc_ptr++; 1701 } 1702 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1703 1704 sess_data->iov[2].iov_len = (long) bcc_ptr - 1705 (long) sess_data->iov[2].iov_base; 1706 1707 return 0; 1708 } 1709 1710 static void 1711 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data); 1712 1713 static void 1714 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data) 1715 { 1716 int rc; 1717 struct smb_hdr *smb_buf; 1718 SESSION_SETUP_ANDX *pSMB; 1719 struct cifs_ses *ses = sess_data->ses; 1720 struct TCP_Server_Info *server = sess_data->server; 1721 __u16 bytes_remaining; 1722 char *bcc_ptr; 1723 unsigned char *ntlmsspblob = NULL; 1724 u16 blob_len; 1725 1726 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n"); 1727 1728 /* 1729 * if memory allocation is successful, caller of this function 1730 * frees it. 1731 */ 1732 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); 1733 if (!ses->ntlmssp) { 1734 rc = -ENOMEM; 1735 goto out; 1736 } 1737 ses->ntlmssp->sesskey_per_smbsess = false; 1738 1739 /* wct = 12 */ 1740 rc = sess_alloc_buffer(sess_data, 12); 1741 if (rc) 1742 goto out; 1743 1744 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1745 1746 /* Build security blob before we assemble the request */ 1747 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob, 1748 &blob_len, ses, server, 1749 sess_data->nls_cp); 1750 if (rc) 1751 goto out_free_ntlmsspblob; 1752 1753 sess_data->iov[1].iov_len = blob_len; 1754 sess_data->iov[1].iov_base = ntlmsspblob; 1755 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1756 1757 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1758 if (rc) 1759 goto out_free_ntlmsspblob; 1760 1761 rc = sess_sendreceive(sess_data); 1762 1763 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1764 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1765 1766 /* If true, rc here is expected and not an error */ 1767 if (sess_data->buf0_type != CIFS_NO_BUFFER && 1768 smb_buf->Status.CifsError == 1769 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)) 1770 rc = 0; 1771 1772 if (rc) 1773 goto out_free_ntlmsspblob; 1774 1775 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); 1776 1777 if (smb_buf->WordCount != 4) { 1778 rc = -EIO; 1779 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1780 goto out_free_ntlmsspblob; 1781 } 1782 1783 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1784 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1785 1786 bytes_remaining = get_bcc(smb_buf); 1787 bcc_ptr = pByteArea(smb_buf); 1788 1789 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1790 if (blob_len > bytes_remaining) { 1791 cifs_dbg(VFS, "bad security blob length %d\n", 1792 blob_len); 1793 rc = -EINVAL; 1794 goto out_free_ntlmsspblob; 1795 } 1796 1797 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); 1798 1799 out_free_ntlmsspblob: 1800 kfree_sensitive(ntlmsspblob); 1801 out: 1802 sess_free_buffer(sess_data); 1803 1804 if (!rc) { 1805 sess_data->func = sess_auth_rawntlmssp_authenticate; 1806 return; 1807 } 1808 1809 /* Else error. Cleanup */ 1810 kfree_sensitive(ses->auth_key.response); 1811 ses->auth_key.response = NULL; 1812 kfree_sensitive(ses->ntlmssp); 1813 ses->ntlmssp = NULL; 1814 1815 sess_data->func = NULL; 1816 sess_data->result = rc; 1817 } 1818 1819 static void 1820 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data) 1821 { 1822 int rc; 1823 struct smb_hdr *smb_buf; 1824 SESSION_SETUP_ANDX *pSMB; 1825 struct cifs_ses *ses = sess_data->ses; 1826 struct TCP_Server_Info *server = sess_data->server; 1827 __u16 bytes_remaining; 1828 char *bcc_ptr; 1829 unsigned char *ntlmsspblob = NULL; 1830 u16 blob_len; 1831 1832 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n"); 1833 1834 /* wct = 12 */ 1835 rc = sess_alloc_buffer(sess_data, 12); 1836 if (rc) 1837 goto out; 1838 1839 /* Build security blob before we assemble the request */ 1840 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1841 smb_buf = (struct smb_hdr *)pSMB; 1842 rc = build_ntlmssp_auth_blob(&ntlmsspblob, 1843 &blob_len, ses, server, 1844 sess_data->nls_cp); 1845 if (rc) 1846 goto out_free_ntlmsspblob; 1847 sess_data->iov[1].iov_len = blob_len; 1848 sess_data->iov[1].iov_base = ntlmsspblob; 1849 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1850 /* 1851 * Make sure that we tell the server that we are using 1852 * the uid that it just gave us back on the response 1853 * (challenge) 1854 */ 1855 smb_buf->Uid = ses->Suid; 1856 1857 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1858 if (rc) 1859 goto out_free_ntlmsspblob; 1860 1861 rc = sess_sendreceive(sess_data); 1862 if (rc) 1863 goto out_free_ntlmsspblob; 1864 1865 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1866 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1867 if (smb_buf->WordCount != 4) { 1868 rc = -EIO; 1869 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1870 goto out_free_ntlmsspblob; 1871 } 1872 1873 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1874 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1875 1876 if (ses->Suid != smb_buf->Uid) { 1877 ses->Suid = smb_buf->Uid; 1878 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid); 1879 } 1880 1881 bytes_remaining = get_bcc(smb_buf); 1882 bcc_ptr = pByteArea(smb_buf); 1883 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1884 if (blob_len > bytes_remaining) { 1885 cifs_dbg(VFS, "bad security blob length %d\n", 1886 blob_len); 1887 rc = -EINVAL; 1888 goto out_free_ntlmsspblob; 1889 } 1890 bcc_ptr += blob_len; 1891 bytes_remaining -= blob_len; 1892 1893 1894 /* BB check if Unicode and decode strings */ 1895 if (bytes_remaining == 0) { 1896 /* no string area to decode, do nothing */ 1897 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1898 /* unicode string area must be word-aligned */ 1899 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1900 ++bcc_ptr; 1901 --bytes_remaining; 1902 } 1903 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1904 sess_data->nls_cp); 1905 } else { 1906 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1907 sess_data->nls_cp); 1908 } 1909 1910 out_free_ntlmsspblob: 1911 kfree_sensitive(ntlmsspblob); 1912 out: 1913 sess_free_buffer(sess_data); 1914 1915 if (!rc) 1916 rc = sess_establish_session(sess_data); 1917 1918 /* Cleanup */ 1919 kfree_sensitive(ses->auth_key.response); 1920 ses->auth_key.response = NULL; 1921 kfree_sensitive(ses->ntlmssp); 1922 ses->ntlmssp = NULL; 1923 1924 sess_data->func = NULL; 1925 sess_data->result = rc; 1926 } 1927 1928 static int select_sec(struct sess_data *sess_data) 1929 { 1930 int type; 1931 struct cifs_ses *ses = sess_data->ses; 1932 struct TCP_Server_Info *server = sess_data->server; 1933 1934 type = cifs_select_sectype(server, ses->sectype); 1935 cifs_dbg(FYI, "sess setup type %d\n", type); 1936 if (type == Unspecified) { 1937 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n"); 1938 return -EINVAL; 1939 } 1940 1941 switch (type) { 1942 case NTLMv2: 1943 sess_data->func = sess_auth_ntlmv2; 1944 break; 1945 case Kerberos: 1946 #ifdef CONFIG_CIFS_UPCALL 1947 sess_data->func = sess_auth_kerberos; 1948 break; 1949 #else 1950 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); 1951 return -ENOSYS; 1952 #endif /* CONFIG_CIFS_UPCALL */ 1953 case RawNTLMSSP: 1954 sess_data->func = sess_auth_rawntlmssp_negotiate; 1955 break; 1956 default: 1957 cifs_dbg(VFS, "secType %d not supported!\n", type); 1958 return -ENOSYS; 1959 } 1960 1961 return 0; 1962 } 1963 1964 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, 1965 struct TCP_Server_Info *server, 1966 const struct nls_table *nls_cp) 1967 { 1968 int rc = 0; 1969 struct sess_data *sess_data; 1970 1971 if (ses == NULL) { 1972 WARN(1, "%s: ses == NULL!", __func__); 1973 return -EINVAL; 1974 } 1975 1976 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL); 1977 if (!sess_data) 1978 return -ENOMEM; 1979 1980 sess_data->xid = xid; 1981 sess_data->ses = ses; 1982 sess_data->server = server; 1983 sess_data->buf0_type = CIFS_NO_BUFFER; 1984 sess_data->nls_cp = (struct nls_table *) nls_cp; 1985 1986 rc = select_sec(sess_data); 1987 if (rc) 1988 goto out; 1989 1990 while (sess_data->func) 1991 sess_data->func(sess_data); 1992 1993 /* Store result before we free sess_data */ 1994 rc = sess_data->result; 1995 1996 out: 1997 kfree_sensitive(sess_data); 1998 return rc; 1999 } 2000 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2001