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