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 unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, 684 const struct nls_table *nls_cp) 685 { 686 char *bcc_ptr = *pbcc_area; 687 int bytes_ret = 0; 688 689 /* copy domain */ 690 if (ses->domainName == NULL) { 691 /* 692 * Sending null domain better than using a bogus domain name (as 693 * we did briefly in 2.6.18) since server will use its default 694 */ 695 *bcc_ptr = 0; 696 *(bcc_ptr+1) = 0; 697 bytes_ret = 0; 698 } else 699 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, 700 CIFS_MAX_DOMAINNAME_LEN, nls_cp); 701 bcc_ptr += 2 * bytes_ret; 702 bcc_ptr += 2; /* account for null terminator */ 703 704 *pbcc_area = bcc_ptr; 705 } 706 707 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 708 const struct nls_table *nls_cp) 709 { 710 char *bcc_ptr = *pbcc_area; 711 int bytes_ret = 0; 712 713 /* BB FIXME add check that strings less than 335 or will need to send as arrays */ 714 715 /* copy user */ 716 if (ses->user_name == NULL) { 717 /* null user mount */ 718 *bcc_ptr = 0; 719 *(bcc_ptr+1) = 0; 720 } else { 721 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name, 722 CIFS_MAX_USERNAME_LEN, nls_cp); 723 } 724 bcc_ptr += 2 * bytes_ret; 725 bcc_ptr += 2; /* account for null termination */ 726 727 unicode_domain_string(&bcc_ptr, ses, nls_cp); 728 unicode_oslm_strings(&bcc_ptr, nls_cp); 729 730 *pbcc_area = bcc_ptr; 731 } 732 733 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 734 const struct nls_table *nls_cp) 735 { 736 char *bcc_ptr = *pbcc_area; 737 int len; 738 739 /* copy user */ 740 /* BB what about null user mounts - check that we do this BB */ 741 /* copy user */ 742 if (ses->user_name != NULL) { 743 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN); 744 if (WARN_ON_ONCE(len < 0)) 745 len = CIFS_MAX_USERNAME_LEN - 1; 746 bcc_ptr += len; 747 } 748 /* else null user mount */ 749 *bcc_ptr = 0; 750 bcc_ptr++; /* account for null termination */ 751 752 /* copy domain */ 753 if (ses->domainName != NULL) { 754 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 755 if (WARN_ON_ONCE(len < 0)) 756 len = CIFS_MAX_DOMAINNAME_LEN - 1; 757 bcc_ptr += len; 758 } /* else we send a null domain name so server will default to its own domain */ 759 *bcc_ptr = 0; 760 bcc_ptr++; 761 762 /* BB check for overflow here */ 763 764 strcpy(bcc_ptr, "Linux version "); 765 bcc_ptr += strlen("Linux version "); 766 strcpy(bcc_ptr, init_utsname()->release); 767 bcc_ptr += strlen(init_utsname()->release) + 1; 768 769 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); 770 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; 771 772 *pbcc_area = bcc_ptr; 773 } 774 775 static void 776 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses, 777 const struct nls_table *nls_cp) 778 { 779 int len; 780 char *data = *pbcc_area; 781 782 cifs_dbg(FYI, "bleft %d\n", bleft); 783 784 kfree(ses->serverOS); 785 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 786 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS); 787 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 788 data += len; 789 bleft -= len; 790 if (bleft <= 0) 791 return; 792 793 kfree(ses->serverNOS); 794 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 795 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS); 796 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 797 data += len; 798 bleft -= len; 799 if (bleft <= 0) 800 return; 801 802 kfree(ses->serverDomain); 803 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 804 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain); 805 806 return; 807 } 808 809 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft, 810 struct cifs_ses *ses, 811 const struct nls_table *nls_cp) 812 { 813 int len; 814 char *bcc_ptr = *pbcc_area; 815 816 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft); 817 818 len = strnlen(bcc_ptr, bleft); 819 if (len >= bleft) 820 return; 821 822 kfree(ses->serverOS); 823 824 ses->serverOS = kmalloc(len + 1, GFP_KERNEL); 825 if (ses->serverOS) { 826 memcpy(ses->serverOS, bcc_ptr, len); 827 ses->serverOS[len] = 0; 828 if (strncmp(ses->serverOS, "OS/2", 4) == 0) 829 cifs_dbg(FYI, "OS/2 server\n"); 830 } 831 832 bcc_ptr += len + 1; 833 bleft -= len + 1; 834 835 len = strnlen(bcc_ptr, bleft); 836 if (len >= bleft) 837 return; 838 839 kfree(ses->serverNOS); 840 841 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL); 842 if (ses->serverNOS) { 843 memcpy(ses->serverNOS, bcc_ptr, len); 844 ses->serverNOS[len] = 0; 845 } 846 847 bcc_ptr += len + 1; 848 bleft -= len + 1; 849 850 len = strnlen(bcc_ptr, bleft); 851 if (len > bleft) 852 return; 853 854 /* 855 * No domain field in LANMAN case. Domain is 856 * returned by old servers in the SMB negprot response 857 * 858 * BB For newer servers which do not support Unicode, 859 * but thus do return domain here, we could add parsing 860 * for it later, but it is not very important 861 */ 862 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft); 863 } 864 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 865 866 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, 867 struct cifs_ses *ses) 868 { 869 unsigned int tioffset; /* challenge message target info area */ 870 unsigned int tilen; /* challenge message target info area length */ 871 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; 872 __u32 server_flags; 873 874 if (blob_len < sizeof(CHALLENGE_MESSAGE)) { 875 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len); 876 return -EINVAL; 877 } 878 879 if (memcmp(pblob->Signature, "NTLMSSP", 8)) { 880 cifs_dbg(VFS, "blob signature incorrect %s\n", 881 pblob->Signature); 882 return -EINVAL; 883 } 884 if (pblob->MessageType != NtLmChallenge) { 885 cifs_dbg(VFS, "Incorrect message type %d\n", 886 pblob->MessageType); 887 return -EINVAL; 888 } 889 890 server_flags = le32_to_cpu(pblob->NegotiateFlags); 891 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__, 892 ses->ntlmssp->client_flags, server_flags); 893 894 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) && 895 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) { 896 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n", 897 __func__); 898 return -EINVAL; 899 } 900 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) { 901 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__); 902 return -EINVAL; 903 } 904 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) { 905 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n", 906 __func__); 907 return -EOPNOTSUPP; 908 } 909 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) && 910 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH)) 911 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n", 912 __func__); 913 914 ses->ntlmssp->server_flags = server_flags; 915 916 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); 917 /* 918 * In particular we can examine sign flags 919 * 920 * BB spec says that if AvId field of MsvAvTimestamp is populated then 921 * we must set the MIC field of the AUTHENTICATE_MESSAGE 922 */ 923 924 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset); 925 tilen = le16_to_cpu(pblob->TargetInfoArray.Length); 926 if (tioffset > blob_len || tioffset + tilen > blob_len) { 927 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n", 928 tioffset, tilen); 929 return -EINVAL; 930 } 931 if (tilen) { 932 kfree_sensitive(ses->auth_key.response); 933 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen, 934 GFP_KERNEL); 935 if (!ses->auth_key.response) { 936 cifs_dbg(VFS, "Challenge target info alloc failure\n"); 937 return -ENOMEM; 938 } 939 ses->auth_key.len = tilen; 940 } 941 942 return 0; 943 } 944 945 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size) 946 { 947 int sz = base_size + ses->auth_key.len 948 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2; 949 950 if (ses->domainName) 951 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 952 else 953 sz += sizeof(__le16); 954 955 if (ses->user_name) 956 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN); 957 else 958 sz += sizeof(__le16); 959 960 if (ses->workstation_name[0]) 961 sz += sizeof(__le16) * strnlen(ses->workstation_name, 962 ntlmssp_workstation_name_size(ses)); 963 else 964 sz += sizeof(__le16); 965 966 return sz; 967 } 968 969 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf, 970 char *str_value, 971 int str_length, 972 unsigned char *pstart, 973 unsigned char **pcur, 974 const struct nls_table *nls_cp) 975 { 976 unsigned char *tmp = pstart; 977 int len; 978 979 if (!pbuf) 980 return; 981 982 if (!pcur) 983 pcur = &tmp; 984 985 if (!str_value) { 986 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart); 987 pbuf->Length = 0; 988 pbuf->MaximumLength = 0; 989 *pcur += sizeof(__le16); 990 } else { 991 len = cifs_strtoUTF16((__le16 *)*pcur, 992 str_value, 993 str_length, 994 nls_cp); 995 len *= sizeof(__le16); 996 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart); 997 pbuf->Length = cpu_to_le16(len); 998 pbuf->MaximumLength = cpu_to_le16(len); 999 *pcur += len; 1000 } 1001 } 1002 1003 /* BB Move to ntlmssp.c eventually */ 1004 1005 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer, 1006 u16 *buflen, 1007 struct cifs_ses *ses, 1008 struct TCP_Server_Info *server, 1009 const struct nls_table *nls_cp) 1010 { 1011 int rc = 0; 1012 NEGOTIATE_MESSAGE *sec_blob; 1013 __u32 flags; 1014 unsigned char *tmp; 1015 int len; 1016 1017 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE)); 1018 *pbuffer = kmalloc(len, GFP_KERNEL); 1019 if (!*pbuffer) { 1020 rc = -ENOMEM; 1021 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1022 *buflen = 0; 1023 goto setup_ntlm_neg_ret; 1024 } 1025 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer; 1026 1027 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE)); 1028 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1029 sec_blob->MessageType = NtLmNegotiate; 1030 1031 /* BB is NTLMV2 session security format easier to use here? */ 1032 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 1033 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 1034 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC | 1035 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL | 1036 NTLMSSP_NEGOTIATE_SIGN; 1037 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess) 1038 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 1039 1040 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE); 1041 ses->ntlmssp->client_flags = flags; 1042 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1043 1044 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */ 1045 cifs_security_buffer_from_str(&sec_blob->DomainName, 1046 NULL, 1047 CIFS_MAX_DOMAINNAME_LEN, 1048 *pbuffer, &tmp, 1049 nls_cp); 1050 1051 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1052 NULL, 1053 CIFS_MAX_WORKSTATION_LEN, 1054 *pbuffer, &tmp, 1055 nls_cp); 1056 1057 *buflen = tmp - *pbuffer; 1058 setup_ntlm_neg_ret: 1059 return rc; 1060 } 1061 1062 /* 1063 * Build ntlmssp blob with additional fields, such as version, 1064 * supported by modern servers. For safety limit to SMB3 or later 1065 * See notes in MS-NLMP Section 2.2.2.1 e.g. 1066 */ 1067 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer, 1068 u16 *buflen, 1069 struct cifs_ses *ses, 1070 struct TCP_Server_Info *server, 1071 const struct nls_table *nls_cp) 1072 { 1073 int rc = 0; 1074 struct negotiate_message *sec_blob; 1075 __u32 flags; 1076 unsigned char *tmp; 1077 int len; 1078 1079 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message)); 1080 *pbuffer = kmalloc(len, GFP_KERNEL); 1081 if (!*pbuffer) { 1082 rc = -ENOMEM; 1083 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1084 *buflen = 0; 1085 goto setup_ntlm_smb3_neg_ret; 1086 } 1087 sec_blob = (struct negotiate_message *)*pbuffer; 1088 1089 memset(*pbuffer, 0, sizeof(struct negotiate_message)); 1090 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1091 sec_blob->MessageType = NtLmNegotiate; 1092 1093 /* BB is NTLMV2 session security format easier to use here? */ 1094 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 1095 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 1096 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC | 1097 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL | 1098 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION; 1099 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess) 1100 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 1101 1102 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR; 1103 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL; 1104 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD); 1105 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3; 1106 1107 tmp = *pbuffer + sizeof(struct negotiate_message); 1108 ses->ntlmssp->client_flags = flags; 1109 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1110 1111 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */ 1112 cifs_security_buffer_from_str(&sec_blob->DomainName, 1113 NULL, 1114 CIFS_MAX_DOMAINNAME_LEN, 1115 *pbuffer, &tmp, 1116 nls_cp); 1117 1118 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1119 NULL, 1120 CIFS_MAX_WORKSTATION_LEN, 1121 *pbuffer, &tmp, 1122 nls_cp); 1123 1124 *buflen = tmp - *pbuffer; 1125 setup_ntlm_smb3_neg_ret: 1126 return rc; 1127 } 1128 1129 1130 /* See MS-NLMP 2.2.1.3 */ 1131 int build_ntlmssp_auth_blob(unsigned char **pbuffer, 1132 u16 *buflen, 1133 struct cifs_ses *ses, 1134 struct TCP_Server_Info *server, 1135 const struct nls_table *nls_cp) 1136 { 1137 int rc; 1138 AUTHENTICATE_MESSAGE *sec_blob; 1139 __u32 flags; 1140 unsigned char *tmp; 1141 int len; 1142 1143 rc = setup_ntlmv2_rsp(ses, nls_cp); 1144 if (rc) { 1145 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc); 1146 *buflen = 0; 1147 goto setup_ntlmv2_ret; 1148 } 1149 1150 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE)); 1151 *pbuffer = kmalloc(len, GFP_KERNEL); 1152 if (!*pbuffer) { 1153 rc = -ENOMEM; 1154 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1155 *buflen = 0; 1156 goto setup_ntlmv2_ret; 1157 } 1158 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer; 1159 1160 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1161 sec_blob->MessageType = NtLmAuthenticate; 1162 1163 /* send version information in ntlmssp authenticate also */ 1164 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET | 1165 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_VERSION | 1166 NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED; 1167 1168 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR; 1169 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL; 1170 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD); 1171 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3; 1172 1173 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE); 1174 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1175 1176 sec_blob->LmChallengeResponse.BufferOffset = 1177 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); 1178 sec_blob->LmChallengeResponse.Length = 0; 1179 sec_blob->LmChallengeResponse.MaximumLength = 0; 1180 1181 sec_blob->NtChallengeResponse.BufferOffset = 1182 cpu_to_le32(tmp - *pbuffer); 1183 if (ses->user_name != NULL) { 1184 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 1185 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1186 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 1187 1188 sec_blob->NtChallengeResponse.Length = 1189 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1190 sec_blob->NtChallengeResponse.MaximumLength = 1191 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1192 } else { 1193 /* 1194 * don't send an NT Response for anonymous access 1195 */ 1196 sec_blob->NtChallengeResponse.Length = 0; 1197 sec_blob->NtChallengeResponse.MaximumLength = 0; 1198 } 1199 1200 cifs_security_buffer_from_str(&sec_blob->DomainName, 1201 ses->domainName, 1202 CIFS_MAX_DOMAINNAME_LEN, 1203 *pbuffer, &tmp, 1204 nls_cp); 1205 1206 cifs_security_buffer_from_str(&sec_blob->UserName, 1207 ses->user_name, 1208 CIFS_MAX_USERNAME_LEN, 1209 *pbuffer, &tmp, 1210 nls_cp); 1211 1212 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1213 ses->workstation_name, 1214 ntlmssp_workstation_name_size(ses), 1215 *pbuffer, &tmp, 1216 nls_cp); 1217 1218 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) && 1219 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) && 1220 !calc_seckey(ses)) { 1221 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); 1222 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); 1223 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE); 1224 sec_blob->SessionKey.MaximumLength = 1225 cpu_to_le16(CIFS_CPHTXT_SIZE); 1226 tmp += CIFS_CPHTXT_SIZE; 1227 } else { 1228 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); 1229 sec_blob->SessionKey.Length = 0; 1230 sec_blob->SessionKey.MaximumLength = 0; 1231 } 1232 1233 *buflen = tmp - *pbuffer; 1234 setup_ntlmv2_ret: 1235 return rc; 1236 } 1237 1238 enum securityEnum 1239 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) 1240 { 1241 switch (server->negflavor) { 1242 case CIFS_NEGFLAVOR_EXTENDED: 1243 switch (requested) { 1244 case Kerberos: 1245 case RawNTLMSSP: 1246 case IAKerb: 1247 return requested; 1248 case Unspecified: 1249 if (server->sec_ntlmssp && 1250 (global_secflags & CIFSSEC_MAY_NTLMSSP)) 1251 return RawNTLMSSP; 1252 if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) && 1253 (global_secflags & CIFSSEC_MAY_KRB5)) 1254 return Kerberos; 1255 fallthrough; 1256 default: 1257 return Unspecified; 1258 } 1259 case CIFS_NEGFLAVOR_UNENCAP: 1260 switch (requested) { 1261 case NTLMv2: 1262 return requested; 1263 case Unspecified: 1264 if (global_secflags & CIFSSEC_MAY_NTLMV2) 1265 return NTLMv2; 1266 break; 1267 default: 1268 break; 1269 } 1270 fallthrough; 1271 default: 1272 return Unspecified; 1273 } 1274 } 1275 1276 struct sess_data { 1277 unsigned int xid; 1278 struct cifs_ses *ses; 1279 struct TCP_Server_Info *server; 1280 struct nls_table *nls_cp; 1281 void (*func)(struct sess_data *); 1282 int result; 1283 1284 /* we will send the SMB in three pieces: 1285 * a fixed length beginning part, an optional 1286 * SPNEGO blob (which can be zero length), and a 1287 * last part which will include the strings 1288 * and rest of bcc area. This allows us to avoid 1289 * a large buffer 17K allocation 1290 */ 1291 int buf0_type; 1292 struct kvec iov[3]; 1293 }; 1294 1295 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1296 static int 1297 sess_alloc_buffer(struct sess_data *sess_data, int wct) 1298 { 1299 int rc; 1300 struct cifs_ses *ses = sess_data->ses; 1301 struct smb_hdr *smb_buf; 1302 1303 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, 1304 (void **)&smb_buf); 1305 1306 if (rc) 1307 return rc; 1308 1309 sess_data->iov[0].iov_base = (char *)smb_buf; 1310 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; 1311 /* 1312 * This variable will be used to clear the buffer 1313 * allocated above in case of any error in the calling function. 1314 */ 1315 sess_data->buf0_type = CIFS_SMALL_BUFFER; 1316 1317 /* 2000 big enough to fit max user, domain, NOS name etc. */ 1318 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL); 1319 if (!sess_data->iov[2].iov_base) { 1320 rc = -ENOMEM; 1321 goto out_free_smb_buf; 1322 } 1323 1324 return 0; 1325 1326 out_free_smb_buf: 1327 cifs_small_buf_release(smb_buf); 1328 sess_data->iov[0].iov_base = NULL; 1329 sess_data->iov[0].iov_len = 0; 1330 sess_data->buf0_type = CIFS_NO_BUFFER; 1331 return rc; 1332 } 1333 1334 static void 1335 sess_free_buffer(struct sess_data *sess_data) 1336 { 1337 struct kvec *iov = sess_data->iov; 1338 1339 /* 1340 * Zero the session data before freeing, as it might contain sensitive info (keys, etc). 1341 * Note that iov[1] is already freed by caller. 1342 */ 1343 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base) 1344 memzero_explicit(iov[0].iov_base, iov[0].iov_len); 1345 1346 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base); 1347 sess_data->buf0_type = CIFS_NO_BUFFER; 1348 kfree_sensitive(iov[2].iov_base); 1349 } 1350 1351 static int 1352 sess_establish_session(struct sess_data *sess_data) 1353 { 1354 struct cifs_ses *ses = sess_data->ses; 1355 struct TCP_Server_Info *server = sess_data->server; 1356 1357 cifs_server_lock(server); 1358 if (!server->session_estab) { 1359 if (server->sign) { 1360 server->session_key.response = 1361 kmemdup(ses->auth_key.response, 1362 ses->auth_key.len, GFP_KERNEL); 1363 if (!server->session_key.response) { 1364 cifs_server_unlock(server); 1365 return -ENOMEM; 1366 } 1367 server->session_key.len = 1368 ses->auth_key.len; 1369 } 1370 server->sequence_number = 0x2; 1371 server->session_estab = true; 1372 } 1373 cifs_server_unlock(server); 1374 1375 cifs_dbg(FYI, "CIFS session established successfully\n"); 1376 return 0; 1377 } 1378 1379 static int 1380 sess_sendreceive(struct sess_data *sess_data) 1381 { 1382 int rc; 1383 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base; 1384 __u16 count; 1385 struct kvec rsp_iov = { NULL, 0 }; 1386 1387 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len; 1388 be32_add_cpu(&smb_buf->smb_buf_length, count); 1389 put_bcc(count, smb_buf); 1390 1391 rc = SendReceive2(sess_data->xid, sess_data->ses, 1392 sess_data->iov, 3 /* num_iovecs */, 1393 &sess_data->buf0_type, 1394 CIFS_LOG_ERROR, &rsp_iov); 1395 cifs_small_buf_release(sess_data->iov[0].iov_base); 1396 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); 1397 1398 return rc; 1399 } 1400 1401 static void 1402 sess_auth_ntlmv2(struct sess_data *sess_data) 1403 { 1404 int rc = 0; 1405 struct smb_hdr *smb_buf; 1406 SESSION_SETUP_ANDX *pSMB; 1407 char *bcc_ptr; 1408 struct cifs_ses *ses = sess_data->ses; 1409 struct TCP_Server_Info *server = sess_data->server; 1410 __u32 capabilities; 1411 __u16 bytes_remaining; 1412 1413 /* old style NTLM sessionsetup */ 1414 /* wct = 13 */ 1415 rc = sess_alloc_buffer(sess_data, 13); 1416 if (rc) 1417 goto out; 1418 1419 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1420 bcc_ptr = sess_data->iov[2].iov_base; 1421 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1422 1423 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 1424 1425 /* LM2 password would be here if we supported it */ 1426 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; 1427 1428 if (ses->user_name != NULL) { 1429 /* calculate nlmv2 response and session key */ 1430 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp); 1431 if (rc) { 1432 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc); 1433 goto out; 1434 } 1435 1436 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 1437 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1438 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 1439 1440 /* set case sensitive password length after tilen may get 1441 * assigned, tilen is 0 otherwise. 1442 */ 1443 pSMB->req_no_secext.CaseSensitivePasswordLength = 1444 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1445 } else { 1446 pSMB->req_no_secext.CaseSensitivePasswordLength = 0; 1447 } 1448 1449 if (ses->capabilities & CAP_UNICODE) { 1450 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) { 1451 *bcc_ptr = 0; 1452 bcc_ptr++; 1453 } 1454 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1455 } else { 1456 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1457 } 1458 1459 1460 sess_data->iov[2].iov_len = (long) bcc_ptr - 1461 (long) sess_data->iov[2].iov_base; 1462 1463 rc = sess_sendreceive(sess_data); 1464 if (rc) 1465 goto out; 1466 1467 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1468 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1469 1470 if (smb_buf->WordCount != 3) { 1471 rc = -EIO; 1472 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1473 goto out; 1474 } 1475 1476 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1477 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1478 1479 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1480 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1481 1482 bytes_remaining = get_bcc(smb_buf); 1483 bcc_ptr = pByteArea(smb_buf); 1484 1485 /* BB check if Unicode and decode strings */ 1486 if (bytes_remaining == 0) { 1487 /* no string area to decode, do nothing */ 1488 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1489 /* unicode string area must be word-aligned */ 1490 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1491 ++bcc_ptr; 1492 --bytes_remaining; 1493 } 1494 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1495 sess_data->nls_cp); 1496 } else { 1497 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1498 sess_data->nls_cp); 1499 } 1500 1501 rc = sess_establish_session(sess_data); 1502 out: 1503 sess_data->result = rc; 1504 sess_data->func = NULL; 1505 sess_free_buffer(sess_data); 1506 kfree_sensitive(ses->auth_key.response); 1507 ses->auth_key.response = NULL; 1508 } 1509 1510 #ifdef CONFIG_CIFS_UPCALL 1511 static void 1512 sess_auth_kerberos(struct sess_data *sess_data) 1513 { 1514 int rc = 0; 1515 struct smb_hdr *smb_buf; 1516 SESSION_SETUP_ANDX *pSMB; 1517 char *bcc_ptr; 1518 struct cifs_ses *ses = sess_data->ses; 1519 struct TCP_Server_Info *server = sess_data->server; 1520 __u32 capabilities; 1521 __u16 bytes_remaining; 1522 struct key *spnego_key = NULL; 1523 struct cifs_spnego_msg *msg; 1524 u16 blob_len; 1525 1526 /* extended security */ 1527 /* wct = 12 */ 1528 rc = sess_alloc_buffer(sess_data, 12); 1529 if (rc) 1530 goto out; 1531 1532 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1533 bcc_ptr = sess_data->iov[2].iov_base; 1534 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1535 1536 spnego_key = cifs_get_spnego_key(ses, server); 1537 if (IS_ERR(spnego_key)) { 1538 rc = PTR_ERR(spnego_key); 1539 spnego_key = NULL; 1540 goto out; 1541 } 1542 1543 msg = spnego_key->payload.data[0]; 1544 /* 1545 * check version field to make sure that cifs.upcall is 1546 * sending us a response in an expected form 1547 */ 1548 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 1549 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n", 1550 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 1551 rc = -EKEYREJECTED; 1552 goto out_put_spnego_key; 1553 } 1554 1555 kfree_sensitive(ses->auth_key.response); 1556 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, 1557 GFP_KERNEL); 1558 if (!ses->auth_key.response) { 1559 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n", 1560 msg->sesskey_len); 1561 rc = -ENOMEM; 1562 goto out_put_spnego_key; 1563 } 1564 ses->auth_key.len = msg->sesskey_len; 1565 1566 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1567 capabilities |= CAP_EXTENDED_SECURITY; 1568 pSMB->req.Capabilities = cpu_to_le32(capabilities); 1569 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; 1570 sess_data->iov[1].iov_len = msg->secblob_len; 1571 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len); 1572 1573 if (ses->capabilities & CAP_UNICODE) { 1574 /* unicode strings must be word aligned */ 1575 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1576 *bcc_ptr = 0; 1577 bcc_ptr++; 1578 } 1579 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1580 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp); 1581 } else { 1582 /* BB: is this right? */ 1583 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1584 } 1585 1586 sess_data->iov[2].iov_len = (long) bcc_ptr - 1587 (long) sess_data->iov[2].iov_base; 1588 1589 rc = sess_sendreceive(sess_data); 1590 if (rc) 1591 goto out_put_spnego_key; 1592 1593 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1594 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1595 1596 if (smb_buf->WordCount != 4) { 1597 rc = -EIO; 1598 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1599 goto out_put_spnego_key; 1600 } 1601 1602 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1603 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1604 1605 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1606 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1607 1608 bytes_remaining = get_bcc(smb_buf); 1609 bcc_ptr = pByteArea(smb_buf); 1610 1611 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1612 if (blob_len > bytes_remaining) { 1613 cifs_dbg(VFS, "bad security blob length %d\n", 1614 blob_len); 1615 rc = -EINVAL; 1616 goto out_put_spnego_key; 1617 } 1618 bcc_ptr += blob_len; 1619 bytes_remaining -= blob_len; 1620 1621 /* BB check if Unicode and decode strings */ 1622 if (bytes_remaining == 0) { 1623 /* no string area to decode, do nothing */ 1624 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1625 /* unicode string area must be word-aligned */ 1626 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1627 ++bcc_ptr; 1628 --bytes_remaining; 1629 } 1630 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1631 sess_data->nls_cp); 1632 } else { 1633 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1634 sess_data->nls_cp); 1635 } 1636 1637 rc = sess_establish_session(sess_data); 1638 out_put_spnego_key: 1639 key_invalidate(spnego_key); 1640 key_put(spnego_key); 1641 out: 1642 sess_data->result = rc; 1643 sess_data->func = NULL; 1644 sess_free_buffer(sess_data); 1645 kfree_sensitive(ses->auth_key.response); 1646 ses->auth_key.response = NULL; 1647 } 1648 1649 #endif /* ! CONFIG_CIFS_UPCALL */ 1650 1651 /* 1652 * The required kvec buffers have to be allocated before calling this 1653 * function. 1654 */ 1655 static int 1656 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data) 1657 { 1658 SESSION_SETUP_ANDX *pSMB; 1659 struct cifs_ses *ses = sess_data->ses; 1660 struct TCP_Server_Info *server = sess_data->server; 1661 __u32 capabilities; 1662 char *bcc_ptr; 1663 1664 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1665 1666 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1667 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { 1668 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n"); 1669 return -ENOSYS; 1670 } 1671 1672 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1673 capabilities |= CAP_EXTENDED_SECURITY; 1674 pSMB->req.Capabilities |= cpu_to_le32(capabilities); 1675 1676 bcc_ptr = sess_data->iov[2].iov_base; 1677 /* unicode strings must be word aligned */ 1678 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1679 *bcc_ptr = 0; 1680 bcc_ptr++; 1681 } 1682 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1683 1684 sess_data->iov[2].iov_len = (long) bcc_ptr - 1685 (long) sess_data->iov[2].iov_base; 1686 1687 return 0; 1688 } 1689 1690 static void 1691 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data); 1692 1693 static void 1694 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data) 1695 { 1696 int rc; 1697 struct smb_hdr *smb_buf; 1698 SESSION_SETUP_ANDX *pSMB; 1699 struct cifs_ses *ses = sess_data->ses; 1700 struct TCP_Server_Info *server = sess_data->server; 1701 __u16 bytes_remaining; 1702 char *bcc_ptr; 1703 unsigned char *ntlmsspblob = NULL; 1704 u16 blob_len; 1705 1706 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n"); 1707 1708 /* 1709 * if memory allocation is successful, caller of this function 1710 * frees it. 1711 */ 1712 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); 1713 if (!ses->ntlmssp) { 1714 rc = -ENOMEM; 1715 goto out; 1716 } 1717 ses->ntlmssp->sesskey_per_smbsess = false; 1718 1719 /* wct = 12 */ 1720 rc = sess_alloc_buffer(sess_data, 12); 1721 if (rc) 1722 goto out; 1723 1724 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1725 1726 /* Build security blob before we assemble the request */ 1727 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob, 1728 &blob_len, ses, server, 1729 sess_data->nls_cp); 1730 if (rc) 1731 goto out_free_ntlmsspblob; 1732 1733 sess_data->iov[1].iov_len = blob_len; 1734 sess_data->iov[1].iov_base = ntlmsspblob; 1735 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1736 1737 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1738 if (rc) 1739 goto out_free_ntlmsspblob; 1740 1741 rc = sess_sendreceive(sess_data); 1742 1743 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1744 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1745 1746 /* If true, rc here is expected and not an error */ 1747 if (sess_data->buf0_type != CIFS_NO_BUFFER && 1748 smb_buf->Status.CifsError == 1749 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)) 1750 rc = 0; 1751 1752 if (rc) 1753 goto out_free_ntlmsspblob; 1754 1755 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); 1756 1757 if (smb_buf->WordCount != 4) { 1758 rc = -EIO; 1759 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1760 goto out_free_ntlmsspblob; 1761 } 1762 1763 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1764 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1765 1766 bytes_remaining = get_bcc(smb_buf); 1767 bcc_ptr = pByteArea(smb_buf); 1768 1769 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1770 if (blob_len > bytes_remaining) { 1771 cifs_dbg(VFS, "bad security blob length %d\n", 1772 blob_len); 1773 rc = -EINVAL; 1774 goto out_free_ntlmsspblob; 1775 } 1776 1777 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); 1778 1779 out_free_ntlmsspblob: 1780 kfree_sensitive(ntlmsspblob); 1781 out: 1782 sess_free_buffer(sess_data); 1783 1784 if (!rc) { 1785 sess_data->func = sess_auth_rawntlmssp_authenticate; 1786 return; 1787 } 1788 1789 /* Else error. Cleanup */ 1790 kfree_sensitive(ses->auth_key.response); 1791 ses->auth_key.response = NULL; 1792 kfree_sensitive(ses->ntlmssp); 1793 ses->ntlmssp = NULL; 1794 1795 sess_data->func = NULL; 1796 sess_data->result = rc; 1797 } 1798 1799 static void 1800 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data) 1801 { 1802 int rc; 1803 struct smb_hdr *smb_buf; 1804 SESSION_SETUP_ANDX *pSMB; 1805 struct cifs_ses *ses = sess_data->ses; 1806 struct TCP_Server_Info *server = sess_data->server; 1807 __u16 bytes_remaining; 1808 char *bcc_ptr; 1809 unsigned char *ntlmsspblob = NULL; 1810 u16 blob_len; 1811 1812 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n"); 1813 1814 /* wct = 12 */ 1815 rc = sess_alloc_buffer(sess_data, 12); 1816 if (rc) 1817 goto out; 1818 1819 /* Build security blob before we assemble the request */ 1820 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1821 smb_buf = (struct smb_hdr *)pSMB; 1822 rc = build_ntlmssp_auth_blob(&ntlmsspblob, 1823 &blob_len, ses, server, 1824 sess_data->nls_cp); 1825 if (rc) 1826 goto out_free_ntlmsspblob; 1827 sess_data->iov[1].iov_len = blob_len; 1828 sess_data->iov[1].iov_base = ntlmsspblob; 1829 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1830 /* 1831 * Make sure that we tell the server that we are using 1832 * the uid that it just gave us back on the response 1833 * (challenge) 1834 */ 1835 smb_buf->Uid = ses->Suid; 1836 1837 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1838 if (rc) 1839 goto out_free_ntlmsspblob; 1840 1841 rc = sess_sendreceive(sess_data); 1842 if (rc) 1843 goto out_free_ntlmsspblob; 1844 1845 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1846 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1847 if (smb_buf->WordCount != 4) { 1848 rc = -EIO; 1849 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1850 goto out_free_ntlmsspblob; 1851 } 1852 1853 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1854 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1855 1856 if (ses->Suid != smb_buf->Uid) { 1857 ses->Suid = smb_buf->Uid; 1858 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid); 1859 } 1860 1861 bytes_remaining = get_bcc(smb_buf); 1862 bcc_ptr = pByteArea(smb_buf); 1863 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1864 if (blob_len > bytes_remaining) { 1865 cifs_dbg(VFS, "bad security blob length %d\n", 1866 blob_len); 1867 rc = -EINVAL; 1868 goto out_free_ntlmsspblob; 1869 } 1870 bcc_ptr += blob_len; 1871 bytes_remaining -= blob_len; 1872 1873 1874 /* BB check if Unicode and decode strings */ 1875 if (bytes_remaining == 0) { 1876 /* no string area to decode, do nothing */ 1877 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1878 /* unicode string area must be word-aligned */ 1879 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1880 ++bcc_ptr; 1881 --bytes_remaining; 1882 } 1883 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1884 sess_data->nls_cp); 1885 } else { 1886 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1887 sess_data->nls_cp); 1888 } 1889 1890 out_free_ntlmsspblob: 1891 kfree_sensitive(ntlmsspblob); 1892 out: 1893 sess_free_buffer(sess_data); 1894 1895 if (!rc) 1896 rc = sess_establish_session(sess_data); 1897 1898 /* Cleanup */ 1899 kfree_sensitive(ses->auth_key.response); 1900 ses->auth_key.response = NULL; 1901 kfree_sensitive(ses->ntlmssp); 1902 ses->ntlmssp = NULL; 1903 1904 sess_data->func = NULL; 1905 sess_data->result = rc; 1906 } 1907 1908 static int select_sec(struct sess_data *sess_data) 1909 { 1910 int type; 1911 struct cifs_ses *ses = sess_data->ses; 1912 struct TCP_Server_Info *server = sess_data->server; 1913 1914 type = cifs_select_sectype(server, ses->sectype); 1915 cifs_dbg(FYI, "sess setup type %d\n", type); 1916 if (type == Unspecified) { 1917 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n"); 1918 return -EINVAL; 1919 } 1920 1921 switch (type) { 1922 case NTLMv2: 1923 sess_data->func = sess_auth_ntlmv2; 1924 break; 1925 case Kerberos: 1926 #ifdef CONFIG_CIFS_UPCALL 1927 sess_data->func = sess_auth_kerberos; 1928 break; 1929 #else 1930 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); 1931 return -ENOSYS; 1932 #endif /* CONFIG_CIFS_UPCALL */ 1933 case RawNTLMSSP: 1934 sess_data->func = sess_auth_rawntlmssp_negotiate; 1935 break; 1936 default: 1937 cifs_dbg(VFS, "secType %d not supported!\n", type); 1938 return -ENOSYS; 1939 } 1940 1941 return 0; 1942 } 1943 1944 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, 1945 struct TCP_Server_Info *server, 1946 const struct nls_table *nls_cp) 1947 { 1948 int rc = 0; 1949 struct sess_data *sess_data; 1950 1951 if (ses == NULL) { 1952 WARN(1, "%s: ses == NULL!", __func__); 1953 return -EINVAL; 1954 } 1955 1956 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL); 1957 if (!sess_data) 1958 return -ENOMEM; 1959 1960 sess_data->xid = xid; 1961 sess_data->ses = ses; 1962 sess_data->server = server; 1963 sess_data->buf0_type = CIFS_NO_BUFFER; 1964 sess_data->nls_cp = (struct nls_table *) nls_cp; 1965 1966 rc = select_sec(sess_data); 1967 if (rc) 1968 goto out; 1969 1970 while (sess_data->func) 1971 sess_data->func(sess_data); 1972 1973 /* Store result before we free sess_data */ 1974 rc = sess_data->result; 1975 1976 out: 1977 kfree_sensitive(sess_data); 1978 return rc; 1979 } 1980 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1981