1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * SMB/CIFS session setup handling routines 5 * 6 * Copyright (c) International Business Machines Corp., 2006, 2009 7 * Author(s): Steve French (sfrench@us.ibm.com) 8 * 9 */ 10 11 #include "cifspdu.h" 12 #include "cifsglob.h" 13 #include "cifsproto.h" 14 #include "cifs_unicode.h" 15 #include "cifs_debug.h" 16 #include "ntlmssp.h" 17 #include "nterr.h" 18 #include <linux/utsname.h> 19 #include <linux/slab.h> 20 #include <linux/version.h> 21 #include "cifsfs.h" 22 #include "cifs_spnego.h" 23 #include "smb2proto.h" 24 #include "fs_context.h" 25 26 static int 27 cifs_ses_add_channel(struct cifs_ses *ses, 28 struct cifs_server_iface *iface); 29 30 bool 31 is_server_using_iface(struct TCP_Server_Info *server, 32 struct cifs_server_iface *iface) 33 { 34 struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr; 35 struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr; 36 struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr; 37 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr; 38 39 if (server->dstaddr.ss_family != iface->sockaddr.ss_family) 40 return false; 41 if (server->dstaddr.ss_family == AF_INET) { 42 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr) 43 return false; 44 } else if (server->dstaddr.ss_family == AF_INET6) { 45 if (memcmp(&s6->sin6_addr, &i6->sin6_addr, 46 sizeof(i6->sin6_addr)) != 0) 47 return false; 48 } else { 49 /* unknown family.. */ 50 return false; 51 } 52 return true; 53 } 54 55 bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface) 56 { 57 int i; 58 59 spin_lock(&ses->chan_lock); 60 for (i = 0; i < ses->chan_count; i++) { 61 if (ses->chans[i].iface == iface) { 62 spin_unlock(&ses->chan_lock); 63 return true; 64 } 65 } 66 spin_unlock(&ses->chan_lock); 67 return false; 68 } 69 70 /* channel helper functions. assumed that chan_lock is held by caller. */ 71 72 unsigned int 73 cifs_ses_get_chan_index(struct cifs_ses *ses, 74 struct TCP_Server_Info *server) 75 { 76 unsigned int i; 77 78 for (i = 0; i < ses->chan_count; i++) { 79 if (ses->chans[i].server == server) 80 return i; 81 } 82 83 /* If we didn't find the channel, it is likely a bug */ 84 if (server) 85 cifs_dbg(VFS, "unable to get chan index for server: 0x%llx", 86 server->conn_id); 87 WARN_ON(1); 88 return 0; 89 } 90 91 void 92 cifs_chan_set_in_reconnect(struct cifs_ses *ses, 93 struct TCP_Server_Info *server) 94 { 95 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 96 97 ses->chans[chan_index].in_reconnect = true; 98 } 99 100 void 101 cifs_chan_clear_in_reconnect(struct cifs_ses *ses, 102 struct TCP_Server_Info *server) 103 { 104 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 105 106 ses->chans[chan_index].in_reconnect = false; 107 } 108 109 bool 110 cifs_chan_in_reconnect(struct cifs_ses *ses, 111 struct TCP_Server_Info *server) 112 { 113 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 114 115 return CIFS_CHAN_IN_RECONNECT(ses, chan_index); 116 } 117 118 void 119 cifs_chan_set_need_reconnect(struct cifs_ses *ses, 120 struct TCP_Server_Info *server) 121 { 122 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 123 124 set_bit(chan_index, &ses->chans_need_reconnect); 125 cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n", 126 chan_index, ses->chans_need_reconnect); 127 } 128 129 void 130 cifs_chan_clear_need_reconnect(struct cifs_ses *ses, 131 struct TCP_Server_Info *server) 132 { 133 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 134 135 clear_bit(chan_index, &ses->chans_need_reconnect); 136 cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n", 137 chan_index, ses->chans_need_reconnect); 138 } 139 140 bool 141 cifs_chan_needs_reconnect(struct cifs_ses *ses, 142 struct TCP_Server_Info *server) 143 { 144 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 145 146 return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index); 147 } 148 149 bool 150 cifs_chan_is_iface_active(struct cifs_ses *ses, 151 struct TCP_Server_Info *server) 152 { 153 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 154 155 return ses->chans[chan_index].iface && 156 ses->chans[chan_index].iface->is_active; 157 } 158 159 /* returns number of channels added */ 160 int cifs_try_adding_channels(struct cifs_ses *ses) 161 { 162 struct TCP_Server_Info *server = ses->server; 163 int old_chan_count, new_chan_count; 164 int left; 165 int rc = 0; 166 int tries = 0; 167 size_t iface_weight = 0, iface_min_speed = 0; 168 struct cifs_server_iface *iface = NULL, *niface = NULL; 169 struct cifs_server_iface *last_iface = NULL; 170 171 spin_lock(&ses->chan_lock); 172 173 new_chan_count = old_chan_count = ses->chan_count; 174 left = ses->chan_max - ses->chan_count; 175 176 if (left <= 0) { 177 spin_unlock(&ses->chan_lock); 178 cifs_dbg(FYI, 179 "ses already at max_channels (%zu), nothing to open\n", 180 ses->chan_max); 181 return 0; 182 } 183 184 if (server->dialect < SMB30_PROT_ID) { 185 spin_unlock(&ses->chan_lock); 186 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n"); 187 return 0; 188 } 189 190 if (!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) { 191 spin_unlock(&ses->chan_lock); 192 cifs_server_dbg(VFS, "no multichannel support\n"); 193 return 0; 194 } 195 spin_unlock(&ses->chan_lock); 196 197 while (left > 0) { 198 199 tries++; 200 if (tries > 3*ses->chan_max) { 201 cifs_dbg(VFS, "too many channel open attempts (%d channels left to open)\n", 202 left); 203 break; 204 } 205 206 spin_lock(&ses->iface_lock); 207 if (!ses->iface_count) { 208 spin_unlock(&ses->iface_lock); 209 cifs_dbg(VFS, "server %s does not advertise interfaces\n", 210 ses->server->hostname); 211 break; 212 } 213 214 if (!iface) 215 iface = list_first_entry(&ses->iface_list, struct cifs_server_iface, 216 iface_head); 217 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface, 218 iface_head); 219 iface_min_speed = last_iface->speed; 220 221 list_for_each_entry_safe_from(iface, niface, &ses->iface_list, 222 iface_head) { 223 /* do not mix rdma and non-rdma interfaces */ 224 if (iface->rdma_capable != ses->server->rdma) 225 continue; 226 227 /* skip ifaces that are unusable */ 228 if (!iface->is_active || 229 (is_ses_using_iface(ses, iface) && 230 !iface->rss_capable)) 231 continue; 232 233 /* check if we already allocated enough channels */ 234 iface_weight = iface->speed / iface_min_speed; 235 236 if (iface->weight_fulfilled >= iface_weight) 237 continue; 238 239 /* take ref before unlock */ 240 kref_get(&iface->refcount); 241 242 spin_unlock(&ses->iface_lock); 243 rc = cifs_ses_add_channel(ses, iface); 244 spin_lock(&ses->iface_lock); 245 246 if (rc) { 247 cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n", 248 &iface->sockaddr, 249 rc); 250 kref_put(&iface->refcount, release_iface); 251 continue; 252 } 253 254 iface->num_channels++; 255 iface->weight_fulfilled++; 256 cifs_dbg(VFS, "successfully opened new channel on iface:%pIS\n", 257 &iface->sockaddr); 258 break; 259 } 260 261 /* reached end of list. reset weight_fulfilled and start over */ 262 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) { 263 list_for_each_entry(iface, &ses->iface_list, iface_head) 264 iface->weight_fulfilled = 0; 265 spin_unlock(&ses->iface_lock); 266 iface = NULL; 267 continue; 268 } 269 spin_unlock(&ses->iface_lock); 270 271 left--; 272 new_chan_count++; 273 } 274 275 return new_chan_count - old_chan_count; 276 } 277 278 /* 279 * update the iface for the channel if necessary. 280 * will return 0 when iface is updated, 1 if removed, 2 otherwise 281 * Must be called with chan_lock held. 282 */ 283 int 284 cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server) 285 { 286 unsigned int chan_index; 287 size_t iface_weight = 0, iface_min_speed = 0; 288 struct cifs_server_iface *iface = NULL; 289 struct cifs_server_iface *old_iface = NULL; 290 struct cifs_server_iface *last_iface = NULL; 291 struct sockaddr_storage ss; 292 int rc = 0; 293 294 spin_lock(&ses->chan_lock); 295 chan_index = cifs_ses_get_chan_index(ses, server); 296 if (!chan_index) { 297 spin_unlock(&ses->chan_lock); 298 return 0; 299 } 300 301 if (ses->chans[chan_index].iface) { 302 old_iface = ses->chans[chan_index].iface; 303 if (old_iface->is_active) { 304 spin_unlock(&ses->chan_lock); 305 return 1; 306 } 307 } 308 spin_unlock(&ses->chan_lock); 309 310 spin_lock(&server->srv_lock); 311 ss = server->dstaddr; 312 spin_unlock(&server->srv_lock); 313 314 spin_lock(&ses->iface_lock); 315 if (!ses->iface_count) { 316 spin_unlock(&ses->iface_lock); 317 cifs_dbg(VFS, "server %s does not advertise interfaces\n", ses->server->hostname); 318 return 0; 319 } 320 321 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface, 322 iface_head); 323 iface_min_speed = last_iface->speed; 324 325 /* then look for a new one */ 326 list_for_each_entry(iface, &ses->iface_list, iface_head) { 327 if (!chan_index) { 328 /* if we're trying to get the updated iface for primary channel */ 329 if (!cifs_match_ipaddr((struct sockaddr *) &ss, 330 (struct sockaddr *) &iface->sockaddr)) 331 continue; 332 333 kref_get(&iface->refcount); 334 break; 335 } 336 337 /* do not mix rdma and non-rdma interfaces */ 338 if (iface->rdma_capable != server->rdma) 339 continue; 340 341 if (!iface->is_active || 342 (is_ses_using_iface(ses, iface) && 343 !iface->rss_capable)) { 344 continue; 345 } 346 347 /* check if we already allocated enough channels */ 348 iface_weight = iface->speed / iface_min_speed; 349 350 if (iface->weight_fulfilled >= iface_weight) 351 continue; 352 353 kref_get(&iface->refcount); 354 break; 355 } 356 357 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) { 358 rc = 1; 359 iface = NULL; 360 cifs_dbg(FYI, "unable to find a suitable iface\n"); 361 } 362 363 if (!chan_index && !iface) { 364 cifs_dbg(FYI, "unable to get the interface matching: %pIS\n", 365 &ss); 366 spin_unlock(&ses->iface_lock); 367 return 0; 368 } 369 370 /* now drop the ref to the current iface */ 371 if (old_iface && iface) { 372 cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n", 373 &old_iface->sockaddr, 374 &iface->sockaddr); 375 376 old_iface->num_channels--; 377 if (old_iface->weight_fulfilled) 378 old_iface->weight_fulfilled--; 379 iface->num_channels++; 380 iface->weight_fulfilled++; 381 382 kref_put(&old_iface->refcount, release_iface); 383 } else if (old_iface) { 384 cifs_dbg(FYI, "releasing ref to iface: %pIS\n", 385 &old_iface->sockaddr); 386 387 old_iface->num_channels--; 388 if (old_iface->weight_fulfilled) 389 old_iface->weight_fulfilled--; 390 391 kref_put(&old_iface->refcount, release_iface); 392 } else if (!chan_index) { 393 /* special case: update interface for primary channel */ 394 cifs_dbg(FYI, "referencing primary channel iface: %pIS\n", 395 &iface->sockaddr); 396 iface->num_channels++; 397 iface->weight_fulfilled++; 398 } else { 399 WARN_ON(!iface); 400 cifs_dbg(FYI, "adding new iface: %pIS\n", &iface->sockaddr); 401 } 402 spin_unlock(&ses->iface_lock); 403 404 spin_lock(&ses->chan_lock); 405 chan_index = cifs_ses_get_chan_index(ses, server); 406 ses->chans[chan_index].iface = iface; 407 408 /* No iface is found. if secondary chan, drop connection */ 409 if (!iface && SERVER_IS_CHAN(server)) 410 ses->chans[chan_index].server = NULL; 411 412 spin_unlock(&ses->chan_lock); 413 414 if (!iface && SERVER_IS_CHAN(server)) 415 cifs_put_tcp_session(server, false); 416 417 return rc; 418 } 419 420 /* 421 * If server is a channel of ses, return the corresponding enclosing 422 * cifs_chan otherwise return NULL. 423 */ 424 struct cifs_chan * 425 cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server) 426 { 427 int i; 428 429 spin_lock(&ses->chan_lock); 430 for (i = 0; i < ses->chan_count; i++) { 431 if (ses->chans[i].server == server) { 432 spin_unlock(&ses->chan_lock); 433 return &ses->chans[i]; 434 } 435 } 436 spin_unlock(&ses->chan_lock); 437 return NULL; 438 } 439 440 static int 441 cifs_ses_add_channel(struct cifs_ses *ses, 442 struct cifs_server_iface *iface) 443 { 444 struct TCP_Server_Info *chan_server; 445 struct cifs_chan *chan; 446 struct smb3_fs_context *ctx; 447 static const char unc_fmt[] = "\\%s\\foo"; 448 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr; 449 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr; 450 size_t len; 451 int rc; 452 unsigned int xid = get_xid(); 453 454 if (iface->sockaddr.ss_family == AF_INET) 455 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n", 456 ses, iface->speed, iface->rdma_capable ? "yes" : "no", 457 &ipv4->sin_addr); 458 else 459 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n", 460 ses, iface->speed, iface->rdma_capable ? "yes" : "no", 461 &ipv6->sin6_addr); 462 463 /* 464 * Setup a ctx with mostly the same info as the existing 465 * session and overwrite it with the requested iface data. 466 * 467 * We need to setup at least the fields used for negprot and 468 * sesssetup. 469 * 470 * We only need the ctx here, so we can reuse memory from 471 * the session and server without caring about memory 472 * management. 473 */ 474 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 475 if (!ctx) { 476 rc = -ENOMEM; 477 goto out_free_xid; 478 } 479 480 /* Always make new connection for now (TODO?) */ 481 ctx->nosharesock = true; 482 483 /* Auth */ 484 ctx->domainauto = ses->domainAuto; 485 ctx->domainname = ses->domainName; 486 487 /* no hostname for extra channels */ 488 ctx->server_hostname = ""; 489 490 ctx->username = ses->user_name; 491 ctx->password = ses->password; 492 ctx->sectype = ses->sectype; 493 ctx->sign = ses->sign; 494 495 /* UNC and paths */ 496 /* XXX: Use ses->server->hostname? */ 497 len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL; 498 ctx->UNC = kzalloc(len, GFP_KERNEL); 499 if (!ctx->UNC) { 500 rc = -ENOMEM; 501 goto out_free_ctx; 502 } 503 scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr); 504 ctx->prepath = ""; 505 506 /* Reuse same version as master connection */ 507 ctx->vals = ses->server->vals; 508 ctx->ops = ses->server->ops; 509 510 ctx->noblocksnd = ses->server->noblocksnd; 511 ctx->noautotune = ses->server->noautotune; 512 ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay; 513 ctx->echo_interval = ses->server->echo_interval / HZ; 514 ctx->max_credits = ses->server->max_credits; 515 516 /* 517 * This will be used for encoding/decoding user/domain/pw 518 * during sess setup auth. 519 */ 520 ctx->local_nls = ses->local_nls; 521 522 /* Use RDMA if possible */ 523 ctx->rdma = iface->rdma_capable; 524 memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr)); 525 526 /* reuse master con client guid */ 527 memcpy(&ctx->client_guid, ses->server->client_guid, 528 sizeof(ctx->client_guid)); 529 ctx->use_client_guid = true; 530 531 chan_server = cifs_get_tcp_session(ctx, ses->server); 532 533 spin_lock(&ses->chan_lock); 534 chan = &ses->chans[ses->chan_count]; 535 chan->server = chan_server; 536 if (IS_ERR(chan->server)) { 537 rc = PTR_ERR(chan->server); 538 chan->server = NULL; 539 spin_unlock(&ses->chan_lock); 540 goto out; 541 } 542 chan->iface = iface; 543 ses->chan_count++; 544 atomic_set(&ses->chan_seq, 0); 545 546 /* Mark this channel as needing connect/setup */ 547 cifs_chan_set_need_reconnect(ses, chan->server); 548 549 spin_unlock(&ses->chan_lock); 550 551 mutex_lock(&ses->session_mutex); 552 /* 553 * We need to allocate the server crypto now as we will need 554 * to sign packets before we generate the channel signing key 555 * (we sign with the session key) 556 */ 557 rc = smb311_crypto_shash_allocate(chan->server); 558 if (rc) { 559 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__); 560 mutex_unlock(&ses->session_mutex); 561 goto out; 562 } 563 564 rc = cifs_negotiate_protocol(xid, ses, chan->server); 565 if (!rc) 566 rc = cifs_setup_session(xid, ses, chan->server, ses->local_nls); 567 568 mutex_unlock(&ses->session_mutex); 569 570 out: 571 if (rc && chan->server) { 572 /* 573 * we should avoid race with these delayed works before we 574 * remove this channel 575 */ 576 cancel_delayed_work_sync(&chan->server->echo); 577 cancel_delayed_work_sync(&chan->server->reconnect); 578 579 spin_lock(&ses->chan_lock); 580 /* we rely on all bits beyond chan_count to be clear */ 581 cifs_chan_clear_need_reconnect(ses, chan->server); 582 ses->chan_count--; 583 /* 584 * chan_count should never reach 0 as at least the primary 585 * channel is always allocated 586 */ 587 WARN_ON(ses->chan_count < 1); 588 spin_unlock(&ses->chan_lock); 589 590 cifs_put_tcp_session(chan->server, 0); 591 } 592 593 kfree(ctx->UNC); 594 out_free_ctx: 595 kfree(ctx); 596 out_free_xid: 597 free_xid(xid); 598 return rc; 599 } 600 601 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 602 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, 603 struct TCP_Server_Info *server, 604 SESSION_SETUP_ANDX *pSMB) 605 { 606 __u32 capabilities = 0; 607 608 /* init fields common to all four types of SessSetup */ 609 /* Note that offsets for first seven fields in req struct are same */ 610 /* in CIFS Specs so does not matter which of 3 forms of struct */ 611 /* that we use in next few lines */ 612 /* Note that header is initialized to zero in header_assemble */ 613 pSMB->req.AndXCommand = 0xFF; 614 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32, 615 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4, 616 USHRT_MAX)); 617 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq); 618 pSMB->req.VcNumber = cpu_to_le16(1); 619 620 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ 621 622 /* BB verify whether signing required on neg or just on auth frame 623 (and NTLM case) */ 624 625 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | 626 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; 627 628 if (server->sign) 629 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; 630 631 if (ses->capabilities & CAP_UNICODE) { 632 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; 633 capabilities |= CAP_UNICODE; 634 } 635 if (ses->capabilities & CAP_STATUS32) { 636 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; 637 capabilities |= CAP_STATUS32; 638 } 639 if (ses->capabilities & CAP_DFS) { 640 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; 641 capabilities |= CAP_DFS; 642 } 643 if (ses->capabilities & CAP_UNIX) 644 capabilities |= CAP_UNIX; 645 646 return capabilities; 647 } 648 649 static void 650 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) 651 { 652 char *bcc_ptr = *pbcc_area; 653 int bytes_ret = 0; 654 655 /* Copy OS version */ 656 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32, 657 nls_cp); 658 bcc_ptr += 2 * bytes_ret; 659 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release, 660 32, nls_cp); 661 bcc_ptr += 2 * bytes_ret; 662 bcc_ptr += 2; /* trailing null */ 663 664 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, 665 32, nls_cp); 666 bcc_ptr += 2 * bytes_ret; 667 bcc_ptr += 2; /* trailing null */ 668 669 *pbcc_area = bcc_ptr; 670 } 671 672 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, 673 const struct nls_table *nls_cp) 674 { 675 char *bcc_ptr = *pbcc_area; 676 int bytes_ret = 0; 677 678 /* copy domain */ 679 if (ses->domainName == NULL) { 680 /* Sending null domain better than using a bogus domain name (as 681 we did briefly in 2.6.18) since server will use its default */ 682 *bcc_ptr = 0; 683 *(bcc_ptr+1) = 0; 684 bytes_ret = 0; 685 } else 686 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, 687 CIFS_MAX_DOMAINNAME_LEN, nls_cp); 688 bcc_ptr += 2 * bytes_ret; 689 bcc_ptr += 2; /* account for null terminator */ 690 691 *pbcc_area = bcc_ptr; 692 } 693 694 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 695 const struct nls_table *nls_cp) 696 { 697 char *bcc_ptr = *pbcc_area; 698 int bytes_ret = 0; 699 700 /* BB FIXME add check that strings total less 701 than 335 or will need to send them as arrays */ 702 703 /* copy user */ 704 if (ses->user_name == NULL) { 705 /* null user mount */ 706 *bcc_ptr = 0; 707 *(bcc_ptr+1) = 0; 708 } else { 709 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name, 710 CIFS_MAX_USERNAME_LEN, nls_cp); 711 } 712 bcc_ptr += 2 * bytes_ret; 713 bcc_ptr += 2; /* account for null termination */ 714 715 unicode_domain_string(&bcc_ptr, ses, nls_cp); 716 unicode_oslm_strings(&bcc_ptr, nls_cp); 717 718 *pbcc_area = bcc_ptr; 719 } 720 721 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 722 const struct nls_table *nls_cp) 723 { 724 char *bcc_ptr = *pbcc_area; 725 int len; 726 727 /* copy user */ 728 /* BB what about null user mounts - check that we do this BB */ 729 /* copy user */ 730 if (ses->user_name != NULL) { 731 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN); 732 if (WARN_ON_ONCE(len < 0)) 733 len = CIFS_MAX_USERNAME_LEN - 1; 734 bcc_ptr += len; 735 } 736 /* else null user mount */ 737 *bcc_ptr = 0; 738 bcc_ptr++; /* account for null termination */ 739 740 /* copy domain */ 741 if (ses->domainName != NULL) { 742 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 743 if (WARN_ON_ONCE(len < 0)) 744 len = CIFS_MAX_DOMAINNAME_LEN - 1; 745 bcc_ptr += len; 746 } /* else we will send a null domain name 747 so the server will default to its own domain */ 748 *bcc_ptr = 0; 749 bcc_ptr++; 750 751 /* BB check for overflow here */ 752 753 strcpy(bcc_ptr, "Linux version "); 754 bcc_ptr += strlen("Linux version "); 755 strcpy(bcc_ptr, init_utsname()->release); 756 bcc_ptr += strlen(init_utsname()->release) + 1; 757 758 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); 759 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; 760 761 *pbcc_area = bcc_ptr; 762 } 763 764 static void 765 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses, 766 const struct nls_table *nls_cp) 767 { 768 int len; 769 char *data = *pbcc_area; 770 771 cifs_dbg(FYI, "bleft %d\n", bleft); 772 773 kfree(ses->serverOS); 774 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 775 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS); 776 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 777 data += len; 778 bleft -= len; 779 if (bleft <= 0) 780 return; 781 782 kfree(ses->serverNOS); 783 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 784 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS); 785 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 786 data += len; 787 bleft -= len; 788 if (bleft <= 0) 789 return; 790 791 kfree(ses->serverDomain); 792 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 793 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain); 794 795 return; 796 } 797 798 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft, 799 struct cifs_ses *ses, 800 const struct nls_table *nls_cp) 801 { 802 int len; 803 char *bcc_ptr = *pbcc_area; 804 805 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft); 806 807 len = strnlen(bcc_ptr, bleft); 808 if (len >= bleft) 809 return; 810 811 kfree(ses->serverOS); 812 813 ses->serverOS = kmalloc(len + 1, GFP_KERNEL); 814 if (ses->serverOS) { 815 memcpy(ses->serverOS, bcc_ptr, len); 816 ses->serverOS[len] = 0; 817 if (strncmp(ses->serverOS, "OS/2", 4) == 0) 818 cifs_dbg(FYI, "OS/2 server\n"); 819 } 820 821 bcc_ptr += len + 1; 822 bleft -= len + 1; 823 824 len = strnlen(bcc_ptr, bleft); 825 if (len >= bleft) 826 return; 827 828 kfree(ses->serverNOS); 829 830 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL); 831 if (ses->serverNOS) { 832 memcpy(ses->serverNOS, bcc_ptr, len); 833 ses->serverNOS[len] = 0; 834 } 835 836 bcc_ptr += len + 1; 837 bleft -= len + 1; 838 839 len = strnlen(bcc_ptr, bleft); 840 if (len > bleft) 841 return; 842 843 /* No domain field in LANMAN case. Domain is 844 returned by old servers in the SMB negprot response */ 845 /* BB For newer servers which do not support Unicode, 846 but thus do return domain here we could add parsing 847 for it later, but it is not very important */ 848 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft); 849 } 850 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 851 852 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, 853 struct cifs_ses *ses) 854 { 855 unsigned int tioffset; /* challenge message target info area */ 856 unsigned int tilen; /* challenge message target info area length */ 857 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; 858 __u32 server_flags; 859 860 if (blob_len < sizeof(CHALLENGE_MESSAGE)) { 861 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len); 862 return -EINVAL; 863 } 864 865 if (memcmp(pblob->Signature, "NTLMSSP", 8)) { 866 cifs_dbg(VFS, "blob signature incorrect %s\n", 867 pblob->Signature); 868 return -EINVAL; 869 } 870 if (pblob->MessageType != NtLmChallenge) { 871 cifs_dbg(VFS, "Incorrect message type %d\n", 872 pblob->MessageType); 873 return -EINVAL; 874 } 875 876 server_flags = le32_to_cpu(pblob->NegotiateFlags); 877 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__, 878 ses->ntlmssp->client_flags, server_flags); 879 880 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) && 881 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) { 882 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n", 883 __func__); 884 return -EINVAL; 885 } 886 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) { 887 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__); 888 return -EINVAL; 889 } 890 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) { 891 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n", 892 __func__); 893 return -EOPNOTSUPP; 894 } 895 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) && 896 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH)) 897 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n", 898 __func__); 899 900 ses->ntlmssp->server_flags = server_flags; 901 902 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); 903 /* In particular we can examine sign flags */ 904 /* BB spec says that if AvId field of MsvAvTimestamp is populated then 905 we must set the MIC field of the AUTHENTICATE_MESSAGE */ 906 907 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset); 908 tilen = le16_to_cpu(pblob->TargetInfoArray.Length); 909 if (tioffset > blob_len || tioffset + tilen > blob_len) { 910 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n", 911 tioffset, tilen); 912 return -EINVAL; 913 } 914 if (tilen) { 915 kfree_sensitive(ses->auth_key.response); 916 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen, 917 GFP_KERNEL); 918 if (!ses->auth_key.response) { 919 cifs_dbg(VFS, "Challenge target info alloc failure\n"); 920 return -ENOMEM; 921 } 922 ses->auth_key.len = tilen; 923 } 924 925 return 0; 926 } 927 928 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size) 929 { 930 int sz = base_size + ses->auth_key.len 931 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2; 932 933 if (ses->domainName) 934 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 935 else 936 sz += sizeof(__le16); 937 938 if (ses->user_name) 939 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN); 940 else 941 sz += sizeof(__le16); 942 943 if (ses->workstation_name[0]) 944 sz += sizeof(__le16) * strnlen(ses->workstation_name, 945 ntlmssp_workstation_name_size(ses)); 946 else 947 sz += sizeof(__le16); 948 949 return sz; 950 } 951 952 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf, 953 char *str_value, 954 int str_length, 955 unsigned char *pstart, 956 unsigned char **pcur, 957 const struct nls_table *nls_cp) 958 { 959 unsigned char *tmp = pstart; 960 int len; 961 962 if (!pbuf) 963 return; 964 965 if (!pcur) 966 pcur = &tmp; 967 968 if (!str_value) { 969 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart); 970 pbuf->Length = 0; 971 pbuf->MaximumLength = 0; 972 *pcur += sizeof(__le16); 973 } else { 974 len = cifs_strtoUTF16((__le16 *)*pcur, 975 str_value, 976 str_length, 977 nls_cp); 978 len *= sizeof(__le16); 979 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart); 980 pbuf->Length = cpu_to_le16(len); 981 pbuf->MaximumLength = cpu_to_le16(len); 982 *pcur += len; 983 } 984 } 985 986 /* BB Move to ntlmssp.c eventually */ 987 988 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer, 989 u16 *buflen, 990 struct cifs_ses *ses, 991 struct TCP_Server_Info *server, 992 const struct nls_table *nls_cp) 993 { 994 int rc = 0; 995 NEGOTIATE_MESSAGE *sec_blob; 996 __u32 flags; 997 unsigned char *tmp; 998 int len; 999 1000 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE)); 1001 *pbuffer = kmalloc(len, GFP_KERNEL); 1002 if (!*pbuffer) { 1003 rc = -ENOMEM; 1004 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1005 *buflen = 0; 1006 goto setup_ntlm_neg_ret; 1007 } 1008 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer; 1009 1010 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE)); 1011 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1012 sec_blob->MessageType = NtLmNegotiate; 1013 1014 /* BB is NTLMV2 session security format easier to use here? */ 1015 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 1016 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 1017 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC | 1018 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL | 1019 NTLMSSP_NEGOTIATE_SIGN; 1020 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess) 1021 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 1022 1023 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE); 1024 ses->ntlmssp->client_flags = flags; 1025 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1026 1027 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */ 1028 cifs_security_buffer_from_str(&sec_blob->DomainName, 1029 NULL, 1030 CIFS_MAX_DOMAINNAME_LEN, 1031 *pbuffer, &tmp, 1032 nls_cp); 1033 1034 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1035 NULL, 1036 CIFS_MAX_WORKSTATION_LEN, 1037 *pbuffer, &tmp, 1038 nls_cp); 1039 1040 *buflen = tmp - *pbuffer; 1041 setup_ntlm_neg_ret: 1042 return rc; 1043 } 1044 1045 /* 1046 * Build ntlmssp blob with additional fields, such as version, 1047 * supported by modern servers. For safety limit to SMB3 or later 1048 * See notes in MS-NLMP Section 2.2.2.1 e.g. 1049 */ 1050 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer, 1051 u16 *buflen, 1052 struct cifs_ses *ses, 1053 struct TCP_Server_Info *server, 1054 const struct nls_table *nls_cp) 1055 { 1056 int rc = 0; 1057 struct negotiate_message *sec_blob; 1058 __u32 flags; 1059 unsigned char *tmp; 1060 int len; 1061 1062 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message)); 1063 *pbuffer = kmalloc(len, GFP_KERNEL); 1064 if (!*pbuffer) { 1065 rc = -ENOMEM; 1066 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1067 *buflen = 0; 1068 goto setup_ntlm_smb3_neg_ret; 1069 } 1070 sec_blob = (struct negotiate_message *)*pbuffer; 1071 1072 memset(*pbuffer, 0, sizeof(struct negotiate_message)); 1073 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1074 sec_blob->MessageType = NtLmNegotiate; 1075 1076 /* BB is NTLMV2 session security format easier to use here? */ 1077 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 1078 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 1079 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC | 1080 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL | 1081 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION; 1082 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess) 1083 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 1084 1085 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR; 1086 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL; 1087 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD); 1088 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3; 1089 1090 tmp = *pbuffer + sizeof(struct negotiate_message); 1091 ses->ntlmssp->client_flags = flags; 1092 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1093 1094 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */ 1095 cifs_security_buffer_from_str(&sec_blob->DomainName, 1096 NULL, 1097 CIFS_MAX_DOMAINNAME_LEN, 1098 *pbuffer, &tmp, 1099 nls_cp); 1100 1101 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1102 NULL, 1103 CIFS_MAX_WORKSTATION_LEN, 1104 *pbuffer, &tmp, 1105 nls_cp); 1106 1107 *buflen = tmp - *pbuffer; 1108 setup_ntlm_smb3_neg_ret: 1109 return rc; 1110 } 1111 1112 1113 /* See MS-NLMP 2.2.1.3 */ 1114 int build_ntlmssp_auth_blob(unsigned char **pbuffer, 1115 u16 *buflen, 1116 struct cifs_ses *ses, 1117 struct TCP_Server_Info *server, 1118 const struct nls_table *nls_cp) 1119 { 1120 int rc; 1121 AUTHENTICATE_MESSAGE *sec_blob; 1122 __u32 flags; 1123 unsigned char *tmp; 1124 int len; 1125 1126 rc = setup_ntlmv2_rsp(ses, nls_cp); 1127 if (rc) { 1128 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc); 1129 *buflen = 0; 1130 goto setup_ntlmv2_ret; 1131 } 1132 1133 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE)); 1134 *pbuffer = kmalloc(len, GFP_KERNEL); 1135 if (!*pbuffer) { 1136 rc = -ENOMEM; 1137 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1138 *buflen = 0; 1139 goto setup_ntlmv2_ret; 1140 } 1141 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer; 1142 1143 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1144 sec_blob->MessageType = NtLmAuthenticate; 1145 1146 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET | 1147 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED; 1148 /* we only send version information in ntlmssp negotiate, so do not set this flag */ 1149 flags = flags & ~NTLMSSP_NEGOTIATE_VERSION; 1150 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE); 1151 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1152 1153 sec_blob->LmChallengeResponse.BufferOffset = 1154 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); 1155 sec_blob->LmChallengeResponse.Length = 0; 1156 sec_blob->LmChallengeResponse.MaximumLength = 0; 1157 1158 sec_blob->NtChallengeResponse.BufferOffset = 1159 cpu_to_le32(tmp - *pbuffer); 1160 if (ses->user_name != NULL) { 1161 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 1162 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1163 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 1164 1165 sec_blob->NtChallengeResponse.Length = 1166 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1167 sec_blob->NtChallengeResponse.MaximumLength = 1168 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1169 } else { 1170 /* 1171 * don't send an NT Response for anonymous access 1172 */ 1173 sec_blob->NtChallengeResponse.Length = 0; 1174 sec_blob->NtChallengeResponse.MaximumLength = 0; 1175 } 1176 1177 cifs_security_buffer_from_str(&sec_blob->DomainName, 1178 ses->domainName, 1179 CIFS_MAX_DOMAINNAME_LEN, 1180 *pbuffer, &tmp, 1181 nls_cp); 1182 1183 cifs_security_buffer_from_str(&sec_blob->UserName, 1184 ses->user_name, 1185 CIFS_MAX_USERNAME_LEN, 1186 *pbuffer, &tmp, 1187 nls_cp); 1188 1189 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1190 ses->workstation_name, 1191 ntlmssp_workstation_name_size(ses), 1192 *pbuffer, &tmp, 1193 nls_cp); 1194 1195 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) && 1196 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) && 1197 !calc_seckey(ses)) { 1198 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); 1199 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); 1200 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE); 1201 sec_blob->SessionKey.MaximumLength = 1202 cpu_to_le16(CIFS_CPHTXT_SIZE); 1203 tmp += CIFS_CPHTXT_SIZE; 1204 } else { 1205 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); 1206 sec_blob->SessionKey.Length = 0; 1207 sec_blob->SessionKey.MaximumLength = 0; 1208 } 1209 1210 *buflen = tmp - *pbuffer; 1211 setup_ntlmv2_ret: 1212 return rc; 1213 } 1214 1215 enum securityEnum 1216 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) 1217 { 1218 switch (server->negflavor) { 1219 case CIFS_NEGFLAVOR_EXTENDED: 1220 switch (requested) { 1221 case Kerberos: 1222 case RawNTLMSSP: 1223 return requested; 1224 case Unspecified: 1225 if (server->sec_ntlmssp && 1226 (global_secflags & CIFSSEC_MAY_NTLMSSP)) 1227 return RawNTLMSSP; 1228 if ((server->sec_kerberos || server->sec_mskerberos) && 1229 (global_secflags & CIFSSEC_MAY_KRB5)) 1230 return Kerberos; 1231 fallthrough; 1232 default: 1233 return Unspecified; 1234 } 1235 case CIFS_NEGFLAVOR_UNENCAP: 1236 switch (requested) { 1237 case NTLMv2: 1238 return requested; 1239 case Unspecified: 1240 if (global_secflags & CIFSSEC_MAY_NTLMV2) 1241 return NTLMv2; 1242 break; 1243 default: 1244 break; 1245 } 1246 fallthrough; 1247 default: 1248 return Unspecified; 1249 } 1250 } 1251 1252 struct sess_data { 1253 unsigned int xid; 1254 struct cifs_ses *ses; 1255 struct TCP_Server_Info *server; 1256 struct nls_table *nls_cp; 1257 void (*func)(struct sess_data *); 1258 int result; 1259 1260 /* we will send the SMB in three pieces: 1261 * a fixed length beginning part, an optional 1262 * SPNEGO blob (which can be zero length), and a 1263 * last part which will include the strings 1264 * and rest of bcc area. This allows us to avoid 1265 * a large buffer 17K allocation 1266 */ 1267 int buf0_type; 1268 struct kvec iov[3]; 1269 }; 1270 1271 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1272 static int 1273 sess_alloc_buffer(struct sess_data *sess_data, int wct) 1274 { 1275 int rc; 1276 struct cifs_ses *ses = sess_data->ses; 1277 struct smb_hdr *smb_buf; 1278 1279 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, 1280 (void **)&smb_buf); 1281 1282 if (rc) 1283 return rc; 1284 1285 sess_data->iov[0].iov_base = (char *)smb_buf; 1286 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; 1287 /* 1288 * This variable will be used to clear the buffer 1289 * allocated above in case of any error in the calling function. 1290 */ 1291 sess_data->buf0_type = CIFS_SMALL_BUFFER; 1292 1293 /* 2000 big enough to fit max user, domain, NOS name etc. */ 1294 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL); 1295 if (!sess_data->iov[2].iov_base) { 1296 rc = -ENOMEM; 1297 goto out_free_smb_buf; 1298 } 1299 1300 return 0; 1301 1302 out_free_smb_buf: 1303 cifs_small_buf_release(smb_buf); 1304 sess_data->iov[0].iov_base = NULL; 1305 sess_data->iov[0].iov_len = 0; 1306 sess_data->buf0_type = CIFS_NO_BUFFER; 1307 return rc; 1308 } 1309 1310 static void 1311 sess_free_buffer(struct sess_data *sess_data) 1312 { 1313 struct kvec *iov = sess_data->iov; 1314 1315 /* 1316 * Zero the session data before freeing, as it might contain sensitive info (keys, etc). 1317 * Note that iov[1] is already freed by caller. 1318 */ 1319 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base) 1320 memzero_explicit(iov[0].iov_base, iov[0].iov_len); 1321 1322 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base); 1323 sess_data->buf0_type = CIFS_NO_BUFFER; 1324 kfree_sensitive(iov[2].iov_base); 1325 } 1326 1327 static int 1328 sess_establish_session(struct sess_data *sess_data) 1329 { 1330 struct cifs_ses *ses = sess_data->ses; 1331 struct TCP_Server_Info *server = sess_data->server; 1332 1333 cifs_server_lock(server); 1334 if (!server->session_estab) { 1335 if (server->sign) { 1336 server->session_key.response = 1337 kmemdup(ses->auth_key.response, 1338 ses->auth_key.len, GFP_KERNEL); 1339 if (!server->session_key.response) { 1340 cifs_server_unlock(server); 1341 return -ENOMEM; 1342 } 1343 server->session_key.len = 1344 ses->auth_key.len; 1345 } 1346 server->sequence_number = 0x2; 1347 server->session_estab = true; 1348 } 1349 cifs_server_unlock(server); 1350 1351 cifs_dbg(FYI, "CIFS session established successfully\n"); 1352 return 0; 1353 } 1354 1355 static int 1356 sess_sendreceive(struct sess_data *sess_data) 1357 { 1358 int rc; 1359 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base; 1360 __u16 count; 1361 struct kvec rsp_iov = { NULL, 0 }; 1362 1363 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len; 1364 be32_add_cpu(&smb_buf->smb_buf_length, count); 1365 put_bcc(count, smb_buf); 1366 1367 rc = SendReceive2(sess_data->xid, sess_data->ses, 1368 sess_data->iov, 3 /* num_iovecs */, 1369 &sess_data->buf0_type, 1370 CIFS_LOG_ERROR, &rsp_iov); 1371 cifs_small_buf_release(sess_data->iov[0].iov_base); 1372 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); 1373 1374 return rc; 1375 } 1376 1377 static void 1378 sess_auth_ntlmv2(struct sess_data *sess_data) 1379 { 1380 int rc = 0; 1381 struct smb_hdr *smb_buf; 1382 SESSION_SETUP_ANDX *pSMB; 1383 char *bcc_ptr; 1384 struct cifs_ses *ses = sess_data->ses; 1385 struct TCP_Server_Info *server = sess_data->server; 1386 __u32 capabilities; 1387 __u16 bytes_remaining; 1388 1389 /* old style NTLM sessionsetup */ 1390 /* wct = 13 */ 1391 rc = sess_alloc_buffer(sess_data, 13); 1392 if (rc) 1393 goto out; 1394 1395 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1396 bcc_ptr = sess_data->iov[2].iov_base; 1397 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1398 1399 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 1400 1401 /* LM2 password would be here if we supported it */ 1402 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; 1403 1404 if (ses->user_name != NULL) { 1405 /* calculate nlmv2 response and session key */ 1406 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp); 1407 if (rc) { 1408 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc); 1409 goto out; 1410 } 1411 1412 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 1413 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1414 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 1415 1416 /* set case sensitive password length after tilen may get 1417 * assigned, tilen is 0 otherwise. 1418 */ 1419 pSMB->req_no_secext.CaseSensitivePasswordLength = 1420 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1421 } else { 1422 pSMB->req_no_secext.CaseSensitivePasswordLength = 0; 1423 } 1424 1425 if (ses->capabilities & CAP_UNICODE) { 1426 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) { 1427 *bcc_ptr = 0; 1428 bcc_ptr++; 1429 } 1430 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1431 } else { 1432 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1433 } 1434 1435 1436 sess_data->iov[2].iov_len = (long) bcc_ptr - 1437 (long) sess_data->iov[2].iov_base; 1438 1439 rc = sess_sendreceive(sess_data); 1440 if (rc) 1441 goto out; 1442 1443 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1444 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1445 1446 if (smb_buf->WordCount != 3) { 1447 rc = -EIO; 1448 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1449 goto out; 1450 } 1451 1452 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1453 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1454 1455 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1456 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1457 1458 bytes_remaining = get_bcc(smb_buf); 1459 bcc_ptr = pByteArea(smb_buf); 1460 1461 /* BB check if Unicode and decode strings */ 1462 if (bytes_remaining == 0) { 1463 /* no string area to decode, do nothing */ 1464 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1465 /* unicode string area must be word-aligned */ 1466 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1467 ++bcc_ptr; 1468 --bytes_remaining; 1469 } 1470 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1471 sess_data->nls_cp); 1472 } else { 1473 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1474 sess_data->nls_cp); 1475 } 1476 1477 rc = sess_establish_session(sess_data); 1478 out: 1479 sess_data->result = rc; 1480 sess_data->func = NULL; 1481 sess_free_buffer(sess_data); 1482 kfree_sensitive(ses->auth_key.response); 1483 ses->auth_key.response = NULL; 1484 } 1485 1486 #ifdef CONFIG_CIFS_UPCALL 1487 static void 1488 sess_auth_kerberos(struct sess_data *sess_data) 1489 { 1490 int rc = 0; 1491 struct smb_hdr *smb_buf; 1492 SESSION_SETUP_ANDX *pSMB; 1493 char *bcc_ptr; 1494 struct cifs_ses *ses = sess_data->ses; 1495 struct TCP_Server_Info *server = sess_data->server; 1496 __u32 capabilities; 1497 __u16 bytes_remaining; 1498 struct key *spnego_key = NULL; 1499 struct cifs_spnego_msg *msg; 1500 u16 blob_len; 1501 1502 /* extended security */ 1503 /* wct = 12 */ 1504 rc = sess_alloc_buffer(sess_data, 12); 1505 if (rc) 1506 goto out; 1507 1508 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1509 bcc_ptr = sess_data->iov[2].iov_base; 1510 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1511 1512 spnego_key = cifs_get_spnego_key(ses, server); 1513 if (IS_ERR(spnego_key)) { 1514 rc = PTR_ERR(spnego_key); 1515 spnego_key = NULL; 1516 goto out; 1517 } 1518 1519 msg = spnego_key->payload.data[0]; 1520 /* 1521 * check version field to make sure that cifs.upcall is 1522 * sending us a response in an expected form 1523 */ 1524 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 1525 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n", 1526 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 1527 rc = -EKEYREJECTED; 1528 goto out_put_spnego_key; 1529 } 1530 1531 kfree_sensitive(ses->auth_key.response); 1532 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, 1533 GFP_KERNEL); 1534 if (!ses->auth_key.response) { 1535 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n", 1536 msg->sesskey_len); 1537 rc = -ENOMEM; 1538 goto out_put_spnego_key; 1539 } 1540 ses->auth_key.len = msg->sesskey_len; 1541 1542 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1543 capabilities |= CAP_EXTENDED_SECURITY; 1544 pSMB->req.Capabilities = cpu_to_le32(capabilities); 1545 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; 1546 sess_data->iov[1].iov_len = msg->secblob_len; 1547 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len); 1548 1549 if (ses->capabilities & CAP_UNICODE) { 1550 /* unicode strings must be word aligned */ 1551 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1552 *bcc_ptr = 0; 1553 bcc_ptr++; 1554 } 1555 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1556 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp); 1557 } else { 1558 /* BB: is this right? */ 1559 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1560 } 1561 1562 sess_data->iov[2].iov_len = (long) bcc_ptr - 1563 (long) sess_data->iov[2].iov_base; 1564 1565 rc = sess_sendreceive(sess_data); 1566 if (rc) 1567 goto out_put_spnego_key; 1568 1569 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1570 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1571 1572 if (smb_buf->WordCount != 4) { 1573 rc = -EIO; 1574 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1575 goto out_put_spnego_key; 1576 } 1577 1578 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1579 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1580 1581 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1582 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1583 1584 bytes_remaining = get_bcc(smb_buf); 1585 bcc_ptr = pByteArea(smb_buf); 1586 1587 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1588 if (blob_len > bytes_remaining) { 1589 cifs_dbg(VFS, "bad security blob length %d\n", 1590 blob_len); 1591 rc = -EINVAL; 1592 goto out_put_spnego_key; 1593 } 1594 bcc_ptr += blob_len; 1595 bytes_remaining -= blob_len; 1596 1597 /* BB check if Unicode and decode strings */ 1598 if (bytes_remaining == 0) { 1599 /* no string area to decode, do nothing */ 1600 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1601 /* unicode string area must be word-aligned */ 1602 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1603 ++bcc_ptr; 1604 --bytes_remaining; 1605 } 1606 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1607 sess_data->nls_cp); 1608 } else { 1609 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1610 sess_data->nls_cp); 1611 } 1612 1613 rc = sess_establish_session(sess_data); 1614 out_put_spnego_key: 1615 key_invalidate(spnego_key); 1616 key_put(spnego_key); 1617 out: 1618 sess_data->result = rc; 1619 sess_data->func = NULL; 1620 sess_free_buffer(sess_data); 1621 kfree_sensitive(ses->auth_key.response); 1622 ses->auth_key.response = NULL; 1623 } 1624 1625 #endif /* ! CONFIG_CIFS_UPCALL */ 1626 1627 /* 1628 * The required kvec buffers have to be allocated before calling this 1629 * function. 1630 */ 1631 static int 1632 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data) 1633 { 1634 SESSION_SETUP_ANDX *pSMB; 1635 struct cifs_ses *ses = sess_data->ses; 1636 struct TCP_Server_Info *server = sess_data->server; 1637 __u32 capabilities; 1638 char *bcc_ptr; 1639 1640 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1641 1642 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1643 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { 1644 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n"); 1645 return -ENOSYS; 1646 } 1647 1648 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1649 capabilities |= CAP_EXTENDED_SECURITY; 1650 pSMB->req.Capabilities |= cpu_to_le32(capabilities); 1651 1652 bcc_ptr = sess_data->iov[2].iov_base; 1653 /* unicode strings must be word aligned */ 1654 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1655 *bcc_ptr = 0; 1656 bcc_ptr++; 1657 } 1658 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1659 1660 sess_data->iov[2].iov_len = (long) bcc_ptr - 1661 (long) sess_data->iov[2].iov_base; 1662 1663 return 0; 1664 } 1665 1666 static void 1667 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data); 1668 1669 static void 1670 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data) 1671 { 1672 int rc; 1673 struct smb_hdr *smb_buf; 1674 SESSION_SETUP_ANDX *pSMB; 1675 struct cifs_ses *ses = sess_data->ses; 1676 struct TCP_Server_Info *server = sess_data->server; 1677 __u16 bytes_remaining; 1678 char *bcc_ptr; 1679 unsigned char *ntlmsspblob = NULL; 1680 u16 blob_len; 1681 1682 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n"); 1683 1684 /* 1685 * if memory allocation is successful, caller of this function 1686 * frees it. 1687 */ 1688 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); 1689 if (!ses->ntlmssp) { 1690 rc = -ENOMEM; 1691 goto out; 1692 } 1693 ses->ntlmssp->sesskey_per_smbsess = false; 1694 1695 /* wct = 12 */ 1696 rc = sess_alloc_buffer(sess_data, 12); 1697 if (rc) 1698 goto out; 1699 1700 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1701 1702 /* Build security blob before we assemble the request */ 1703 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob, 1704 &blob_len, ses, server, 1705 sess_data->nls_cp); 1706 if (rc) 1707 goto out_free_ntlmsspblob; 1708 1709 sess_data->iov[1].iov_len = blob_len; 1710 sess_data->iov[1].iov_base = ntlmsspblob; 1711 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1712 1713 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1714 if (rc) 1715 goto out_free_ntlmsspblob; 1716 1717 rc = sess_sendreceive(sess_data); 1718 1719 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1720 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1721 1722 /* If true, rc here is expected and not an error */ 1723 if (sess_data->buf0_type != CIFS_NO_BUFFER && 1724 smb_buf->Status.CifsError == 1725 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)) 1726 rc = 0; 1727 1728 if (rc) 1729 goto out_free_ntlmsspblob; 1730 1731 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); 1732 1733 if (smb_buf->WordCount != 4) { 1734 rc = -EIO; 1735 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1736 goto out_free_ntlmsspblob; 1737 } 1738 1739 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1740 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1741 1742 bytes_remaining = get_bcc(smb_buf); 1743 bcc_ptr = pByteArea(smb_buf); 1744 1745 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1746 if (blob_len > bytes_remaining) { 1747 cifs_dbg(VFS, "bad security blob length %d\n", 1748 blob_len); 1749 rc = -EINVAL; 1750 goto out_free_ntlmsspblob; 1751 } 1752 1753 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); 1754 1755 out_free_ntlmsspblob: 1756 kfree_sensitive(ntlmsspblob); 1757 out: 1758 sess_free_buffer(sess_data); 1759 1760 if (!rc) { 1761 sess_data->func = sess_auth_rawntlmssp_authenticate; 1762 return; 1763 } 1764 1765 /* Else error. Cleanup */ 1766 kfree_sensitive(ses->auth_key.response); 1767 ses->auth_key.response = NULL; 1768 kfree_sensitive(ses->ntlmssp); 1769 ses->ntlmssp = NULL; 1770 1771 sess_data->func = NULL; 1772 sess_data->result = rc; 1773 } 1774 1775 static void 1776 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data) 1777 { 1778 int rc; 1779 struct smb_hdr *smb_buf; 1780 SESSION_SETUP_ANDX *pSMB; 1781 struct cifs_ses *ses = sess_data->ses; 1782 struct TCP_Server_Info *server = sess_data->server; 1783 __u16 bytes_remaining; 1784 char *bcc_ptr; 1785 unsigned char *ntlmsspblob = NULL; 1786 u16 blob_len; 1787 1788 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n"); 1789 1790 /* wct = 12 */ 1791 rc = sess_alloc_buffer(sess_data, 12); 1792 if (rc) 1793 goto out; 1794 1795 /* Build security blob before we assemble the request */ 1796 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1797 smb_buf = (struct smb_hdr *)pSMB; 1798 rc = build_ntlmssp_auth_blob(&ntlmsspblob, 1799 &blob_len, ses, server, 1800 sess_data->nls_cp); 1801 if (rc) 1802 goto out_free_ntlmsspblob; 1803 sess_data->iov[1].iov_len = blob_len; 1804 sess_data->iov[1].iov_base = ntlmsspblob; 1805 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1806 /* 1807 * Make sure that we tell the server that we are using 1808 * the uid that it just gave us back on the response 1809 * (challenge) 1810 */ 1811 smb_buf->Uid = ses->Suid; 1812 1813 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1814 if (rc) 1815 goto out_free_ntlmsspblob; 1816 1817 rc = sess_sendreceive(sess_data); 1818 if (rc) 1819 goto out_free_ntlmsspblob; 1820 1821 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1822 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1823 if (smb_buf->WordCount != 4) { 1824 rc = -EIO; 1825 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1826 goto out_free_ntlmsspblob; 1827 } 1828 1829 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1830 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1831 1832 if (ses->Suid != smb_buf->Uid) { 1833 ses->Suid = smb_buf->Uid; 1834 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid); 1835 } 1836 1837 bytes_remaining = get_bcc(smb_buf); 1838 bcc_ptr = pByteArea(smb_buf); 1839 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1840 if (blob_len > bytes_remaining) { 1841 cifs_dbg(VFS, "bad security blob length %d\n", 1842 blob_len); 1843 rc = -EINVAL; 1844 goto out_free_ntlmsspblob; 1845 } 1846 bcc_ptr += blob_len; 1847 bytes_remaining -= blob_len; 1848 1849 1850 /* BB check if Unicode and decode strings */ 1851 if (bytes_remaining == 0) { 1852 /* no string area to decode, do nothing */ 1853 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1854 /* unicode string area must be word-aligned */ 1855 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1856 ++bcc_ptr; 1857 --bytes_remaining; 1858 } 1859 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1860 sess_data->nls_cp); 1861 } else { 1862 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1863 sess_data->nls_cp); 1864 } 1865 1866 out_free_ntlmsspblob: 1867 kfree_sensitive(ntlmsspblob); 1868 out: 1869 sess_free_buffer(sess_data); 1870 1871 if (!rc) 1872 rc = sess_establish_session(sess_data); 1873 1874 /* Cleanup */ 1875 kfree_sensitive(ses->auth_key.response); 1876 ses->auth_key.response = NULL; 1877 kfree_sensitive(ses->ntlmssp); 1878 ses->ntlmssp = NULL; 1879 1880 sess_data->func = NULL; 1881 sess_data->result = rc; 1882 } 1883 1884 static int select_sec(struct sess_data *sess_data) 1885 { 1886 int type; 1887 struct cifs_ses *ses = sess_data->ses; 1888 struct TCP_Server_Info *server = sess_data->server; 1889 1890 type = cifs_select_sectype(server, ses->sectype); 1891 cifs_dbg(FYI, "sess setup type %d\n", type); 1892 if (type == Unspecified) { 1893 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n"); 1894 return -EINVAL; 1895 } 1896 1897 switch (type) { 1898 case NTLMv2: 1899 sess_data->func = sess_auth_ntlmv2; 1900 break; 1901 case Kerberos: 1902 #ifdef CONFIG_CIFS_UPCALL 1903 sess_data->func = sess_auth_kerberos; 1904 break; 1905 #else 1906 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); 1907 return -ENOSYS; 1908 #endif /* CONFIG_CIFS_UPCALL */ 1909 case RawNTLMSSP: 1910 sess_data->func = sess_auth_rawntlmssp_negotiate; 1911 break; 1912 default: 1913 cifs_dbg(VFS, "secType %d not supported!\n", type); 1914 return -ENOSYS; 1915 } 1916 1917 return 0; 1918 } 1919 1920 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, 1921 struct TCP_Server_Info *server, 1922 const struct nls_table *nls_cp) 1923 { 1924 int rc = 0; 1925 struct sess_data *sess_data; 1926 1927 if (ses == NULL) { 1928 WARN(1, "%s: ses == NULL!", __func__); 1929 return -EINVAL; 1930 } 1931 1932 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL); 1933 if (!sess_data) 1934 return -ENOMEM; 1935 1936 sess_data->xid = xid; 1937 sess_data->ses = ses; 1938 sess_data->server = server; 1939 sess_data->buf0_type = CIFS_NO_BUFFER; 1940 sess_data->nls_cp = (struct nls_table *) nls_cp; 1941 1942 rc = select_sec(sess_data); 1943 if (rc) 1944 goto out; 1945 1946 while (sess_data->func) 1947 sess_data->func(sess_data); 1948 1949 /* Store result before we free sess_data */ 1950 rc = sess_data->result; 1951 1952 out: 1953 kfree_sensitive(sess_data); 1954 return rc; 1955 } 1956 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 1957