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 int 73 cifs_ses_get_chan_index(struct cifs_ses *ses, 74 struct TCP_Server_Info *server) 75 { 76 unsigned int i; 77 78 /* if the channel is waiting for termination */ 79 if (server->terminate) 80 return CIFS_INVAL_CHAN_INDEX; 81 82 for (i = 0; i < ses->chan_count; i++) { 83 if (ses->chans[i].server == server) 84 return i; 85 } 86 87 /* If we didn't find the channel, it is likely a bug */ 88 if (server) 89 cifs_dbg(VFS, "unable to get chan index for server: 0x%llx", 90 server->conn_id); 91 WARN_ON(1); 92 return CIFS_INVAL_CHAN_INDEX; 93 } 94 95 void 96 cifs_chan_set_in_reconnect(struct cifs_ses *ses, 97 struct TCP_Server_Info *server) 98 { 99 int chan_index = cifs_ses_get_chan_index(ses, server); 100 101 if (chan_index == CIFS_INVAL_CHAN_INDEX) 102 return; 103 104 ses->chans[chan_index].in_reconnect = true; 105 } 106 107 void 108 cifs_chan_clear_in_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 ses->chans[chan_index].in_reconnect = false; 117 } 118 119 bool 120 cifs_chan_in_reconnect(struct cifs_ses *ses, 121 struct TCP_Server_Info *server) 122 { 123 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 124 125 if (chan_index == CIFS_INVAL_CHAN_INDEX) 126 return true; /* err on the safer side */ 127 128 return CIFS_CHAN_IN_RECONNECT(ses, chan_index); 129 } 130 131 void 132 cifs_chan_set_need_reconnect(struct cifs_ses *ses, 133 struct TCP_Server_Info *server) 134 { 135 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 136 137 if (chan_index == CIFS_INVAL_CHAN_INDEX) 138 return; 139 140 set_bit(chan_index, &ses->chans_need_reconnect); 141 cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n", 142 chan_index, ses->chans_need_reconnect); 143 } 144 145 void 146 cifs_chan_clear_need_reconnect(struct cifs_ses *ses, 147 struct TCP_Server_Info *server) 148 { 149 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 150 151 if (chan_index == CIFS_INVAL_CHAN_INDEX) 152 return; 153 154 clear_bit(chan_index, &ses->chans_need_reconnect); 155 cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n", 156 chan_index, ses->chans_need_reconnect); 157 } 158 159 bool 160 cifs_chan_needs_reconnect(struct cifs_ses *ses, 161 struct TCP_Server_Info *server) 162 { 163 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 164 165 if (chan_index == CIFS_INVAL_CHAN_INDEX) 166 return true; /* err on the safer side */ 167 168 return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index); 169 } 170 171 bool 172 cifs_chan_is_iface_active(struct cifs_ses *ses, 173 struct TCP_Server_Info *server) 174 { 175 unsigned int chan_index = cifs_ses_get_chan_index(ses, server); 176 177 if (chan_index == CIFS_INVAL_CHAN_INDEX) 178 return true; /* err on the safer side */ 179 180 return ses->chans[chan_index].iface && 181 ses->chans[chan_index].iface->is_active; 182 } 183 184 /* returns number of channels added */ 185 int cifs_try_adding_channels(struct cifs_ses *ses) 186 { 187 struct TCP_Server_Info *server = ses->server; 188 int old_chan_count, new_chan_count; 189 int left; 190 int rc = 0; 191 int tries = 0; 192 size_t iface_weight = 0, iface_min_speed = 0; 193 struct cifs_server_iface *iface = NULL, *niface = NULL; 194 struct cifs_server_iface *last_iface = NULL; 195 196 spin_lock(&ses->chan_lock); 197 198 new_chan_count = old_chan_count = ses->chan_count; 199 left = ses->chan_max - ses->chan_count; 200 201 if (left <= 0) { 202 spin_unlock(&ses->chan_lock); 203 cifs_dbg(FYI, 204 "ses already at max_channels (%zu), nothing to open\n", 205 ses->chan_max); 206 return 0; 207 } 208 209 if (server->dialect < SMB30_PROT_ID) { 210 spin_unlock(&ses->chan_lock); 211 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n"); 212 return 0; 213 } 214 215 if (!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) { 216 spin_unlock(&ses->chan_lock); 217 cifs_server_dbg(VFS, "no multichannel support\n"); 218 return 0; 219 } 220 spin_unlock(&ses->chan_lock); 221 222 while (left > 0) { 223 224 tries++; 225 if (tries > 3*ses->chan_max) { 226 cifs_dbg(VFS, "too many channel open attempts (%d channels left to open)\n", 227 left); 228 break; 229 } 230 231 spin_lock(&ses->iface_lock); 232 if (!ses->iface_count) { 233 spin_unlock(&ses->iface_lock); 234 cifs_dbg(VFS, "server %s does not advertise interfaces\n", 235 ses->server->hostname); 236 break; 237 } 238 239 if (!iface) 240 iface = list_first_entry(&ses->iface_list, struct cifs_server_iface, 241 iface_head); 242 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface, 243 iface_head); 244 iface_min_speed = last_iface->speed; 245 246 list_for_each_entry_safe_from(iface, niface, &ses->iface_list, 247 iface_head) { 248 /* do not mix rdma and non-rdma interfaces */ 249 if (iface->rdma_capable != ses->server->rdma) 250 continue; 251 252 /* skip ifaces that are unusable */ 253 if (!iface->is_active || 254 (is_ses_using_iface(ses, iface) && 255 !iface->rss_capable)) 256 continue; 257 258 /* check if we already allocated enough channels */ 259 iface_weight = iface->speed / iface_min_speed; 260 261 if (iface->weight_fulfilled >= iface_weight) 262 continue; 263 264 /* take ref before unlock */ 265 kref_get(&iface->refcount); 266 267 spin_unlock(&ses->iface_lock); 268 rc = cifs_ses_add_channel(ses, iface); 269 spin_lock(&ses->iface_lock); 270 271 if (rc) { 272 cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n", 273 &iface->sockaddr, 274 rc); 275 kref_put(&iface->refcount, release_iface); 276 /* failure to add chan should increase weight */ 277 iface->weight_fulfilled++; 278 continue; 279 } 280 281 iface->num_channels++; 282 iface->weight_fulfilled++; 283 cifs_dbg(VFS, "successfully opened new channel on iface:%pIS\n", 284 &iface->sockaddr); 285 break; 286 } 287 288 /* reached end of list. reset weight_fulfilled and start over */ 289 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) { 290 list_for_each_entry(iface, &ses->iface_list, iface_head) 291 iface->weight_fulfilled = 0; 292 spin_unlock(&ses->iface_lock); 293 iface = NULL; 294 continue; 295 } 296 spin_unlock(&ses->iface_lock); 297 298 left--; 299 new_chan_count++; 300 } 301 302 return new_chan_count - old_chan_count; 303 } 304 305 /* 306 * called when multichannel is disabled by the server. 307 * this always gets called from smb2_reconnect 308 * and cannot get called in parallel threads. 309 */ 310 void 311 cifs_disable_secondary_channels(struct cifs_ses *ses) 312 { 313 int i, chan_count; 314 struct TCP_Server_Info *server; 315 struct cifs_server_iface *iface; 316 317 spin_lock(&ses->chan_lock); 318 chan_count = ses->chan_count; 319 if (chan_count == 1) 320 goto done; 321 322 ses->chan_count = 1; 323 324 /* for all secondary channels reset the need reconnect bit */ 325 ses->chans_need_reconnect &= 1; 326 327 for (i = 1; i < chan_count; i++) { 328 iface = ses->chans[i].iface; 329 server = ses->chans[i].server; 330 331 /* 332 * remove these references first, since we need to unlock 333 * the chan_lock here, since iface_lock is a higher lock 334 */ 335 ses->chans[i].iface = NULL; 336 ses->chans[i].server = NULL; 337 spin_unlock(&ses->chan_lock); 338 339 if (iface) { 340 spin_lock(&ses->iface_lock); 341 iface->num_channels--; 342 if (iface->weight_fulfilled) 343 iface->weight_fulfilled--; 344 kref_put(&iface->refcount, release_iface); 345 spin_unlock(&ses->iface_lock); 346 } 347 348 if (server) { 349 if (!server->terminate) { 350 server->terminate = true; 351 cifs_signal_cifsd_for_reconnect(server, false); 352 } 353 cifs_put_tcp_session(server, false); 354 } 355 356 spin_lock(&ses->chan_lock); 357 } 358 359 done: 360 spin_unlock(&ses->chan_lock); 361 } 362 363 /* 364 * update the iface for the channel if necessary. 365 * Must be called with chan_lock held. 366 */ 367 void 368 cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server) 369 { 370 unsigned int chan_index; 371 size_t iface_weight = 0, iface_min_speed = 0; 372 struct cifs_server_iface *iface = NULL; 373 struct cifs_server_iface *old_iface = NULL; 374 struct cifs_server_iface *last_iface = NULL; 375 struct sockaddr_storage ss; 376 377 spin_lock(&ses->chan_lock); 378 chan_index = cifs_ses_get_chan_index(ses, server); 379 if (chan_index == CIFS_INVAL_CHAN_INDEX) { 380 spin_unlock(&ses->chan_lock); 381 return; 382 } 383 384 if (ses->chans[chan_index].iface) { 385 old_iface = ses->chans[chan_index].iface; 386 if (old_iface->is_active) { 387 spin_unlock(&ses->chan_lock); 388 return; 389 } 390 } 391 spin_unlock(&ses->chan_lock); 392 393 spin_lock(&server->srv_lock); 394 ss = server->dstaddr; 395 spin_unlock(&server->srv_lock); 396 397 spin_lock(&ses->iface_lock); 398 if (!ses->iface_count) { 399 spin_unlock(&ses->iface_lock); 400 cifs_dbg(VFS, "server %s does not advertise interfaces\n", ses->server->hostname); 401 return; 402 } 403 404 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface, 405 iface_head); 406 iface_min_speed = last_iface->speed; 407 408 /* then look for a new one */ 409 list_for_each_entry(iface, &ses->iface_list, iface_head) { 410 if (!chan_index) { 411 /* if we're trying to get the updated iface for primary channel */ 412 if (!cifs_match_ipaddr((struct sockaddr *) &ss, 413 (struct sockaddr *) &iface->sockaddr)) 414 continue; 415 416 kref_get(&iface->refcount); 417 break; 418 } 419 420 /* do not mix rdma and non-rdma interfaces */ 421 if (iface->rdma_capable != server->rdma) 422 continue; 423 424 if (!iface->is_active || 425 (is_ses_using_iface(ses, iface) && 426 !iface->rss_capable)) { 427 continue; 428 } 429 430 /* check if we already allocated enough channels */ 431 iface_weight = iface->speed / iface_min_speed; 432 433 if (iface->weight_fulfilled >= iface_weight) 434 continue; 435 436 kref_get(&iface->refcount); 437 break; 438 } 439 440 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) { 441 iface = NULL; 442 cifs_dbg(FYI, "unable to find a suitable iface\n"); 443 } 444 445 if (!iface) { 446 if (!chan_index) 447 cifs_dbg(FYI, "unable to get the interface matching: %pIS\n", 448 &ss); 449 else { 450 cifs_dbg(FYI, "unable to find another interface to replace: %pIS\n", 451 &old_iface->sockaddr); 452 } 453 454 spin_unlock(&ses->iface_lock); 455 return; 456 } 457 458 /* now drop the ref to the current iface */ 459 if (old_iface) { 460 cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n", 461 &old_iface->sockaddr, 462 &iface->sockaddr); 463 464 old_iface->num_channels--; 465 if (old_iface->weight_fulfilled) 466 old_iface->weight_fulfilled--; 467 iface->num_channels++; 468 iface->weight_fulfilled++; 469 470 kref_put(&old_iface->refcount, release_iface); 471 } else if (!chan_index) { 472 /* special case: update interface for primary channel */ 473 cifs_dbg(FYI, "referencing primary channel iface: %pIS\n", 474 &iface->sockaddr); 475 iface->num_channels++; 476 iface->weight_fulfilled++; 477 } 478 spin_unlock(&ses->iface_lock); 479 480 spin_lock(&ses->chan_lock); 481 chan_index = cifs_ses_get_chan_index(ses, server); 482 if (chan_index == CIFS_INVAL_CHAN_INDEX) { 483 spin_unlock(&ses->chan_lock); 484 return; 485 } 486 487 ses->chans[chan_index].iface = iface; 488 spin_unlock(&ses->chan_lock); 489 } 490 491 /* 492 * If server is a channel of ses, return the corresponding enclosing 493 * cifs_chan otherwise return NULL. 494 */ 495 struct cifs_chan * 496 cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server) 497 { 498 int i; 499 500 spin_lock(&ses->chan_lock); 501 for (i = 0; i < ses->chan_count; i++) { 502 if (ses->chans[i].server == server) { 503 spin_unlock(&ses->chan_lock); 504 return &ses->chans[i]; 505 } 506 } 507 spin_unlock(&ses->chan_lock); 508 return NULL; 509 } 510 511 static int 512 cifs_ses_add_channel(struct cifs_ses *ses, 513 struct cifs_server_iface *iface) 514 { 515 struct TCP_Server_Info *chan_server; 516 struct cifs_chan *chan; 517 struct smb3_fs_context *ctx; 518 static const char unc_fmt[] = "\\%s\\foo"; 519 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr; 520 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr; 521 size_t len; 522 int rc; 523 unsigned int xid = get_xid(); 524 525 if (iface->sockaddr.ss_family == AF_INET) 526 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n", 527 ses, iface->speed, iface->rdma_capable ? "yes" : "no", 528 &ipv4->sin_addr); 529 else 530 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n", 531 ses, iface->speed, iface->rdma_capable ? "yes" : "no", 532 &ipv6->sin6_addr); 533 534 /* 535 * Setup a ctx with mostly the same info as the existing 536 * session and overwrite it with the requested iface data. 537 * 538 * We need to setup at least the fields used for negprot and 539 * sesssetup. 540 * 541 * We only need the ctx here, so we can reuse memory from 542 * the session and server without caring about memory 543 * management. 544 */ 545 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 546 if (!ctx) { 547 rc = -ENOMEM; 548 goto out_free_xid; 549 } 550 551 /* Always make new connection for now (TODO?) */ 552 ctx->nosharesock = true; 553 554 /* Auth */ 555 ctx->domainauto = ses->domainAuto; 556 ctx->domainname = ses->domainName; 557 558 /* no hostname for extra channels */ 559 ctx->server_hostname = ""; 560 561 ctx->username = ses->user_name; 562 ctx->password = ses->password; 563 ctx->sectype = ses->sectype; 564 ctx->sign = ses->sign; 565 566 /* UNC and paths */ 567 /* XXX: Use ses->server->hostname? */ 568 len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL; 569 ctx->UNC = kzalloc(len, GFP_KERNEL); 570 if (!ctx->UNC) { 571 rc = -ENOMEM; 572 goto out_free_ctx; 573 } 574 scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr); 575 ctx->prepath = ""; 576 577 /* Reuse same version as master connection */ 578 ctx->vals = ses->server->vals; 579 ctx->ops = ses->server->ops; 580 581 ctx->noblocksnd = ses->server->noblocksnd; 582 ctx->noautotune = ses->server->noautotune; 583 ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay; 584 ctx->echo_interval = ses->server->echo_interval / HZ; 585 ctx->max_credits = ses->server->max_credits; 586 587 /* 588 * This will be used for encoding/decoding user/domain/pw 589 * during sess setup auth. 590 */ 591 ctx->local_nls = ses->local_nls; 592 593 /* Use RDMA if possible */ 594 ctx->rdma = iface->rdma_capable; 595 memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr)); 596 597 /* reuse master con client guid */ 598 memcpy(&ctx->client_guid, ses->server->client_guid, 599 sizeof(ctx->client_guid)); 600 ctx->use_client_guid = true; 601 602 chan_server = cifs_get_tcp_session(ctx, ses->server); 603 604 spin_lock(&ses->chan_lock); 605 chan = &ses->chans[ses->chan_count]; 606 chan->server = chan_server; 607 if (IS_ERR(chan->server)) { 608 rc = PTR_ERR(chan->server); 609 chan->server = NULL; 610 spin_unlock(&ses->chan_lock); 611 goto out; 612 } 613 chan->iface = iface; 614 ses->chan_count++; 615 atomic_set(&ses->chan_seq, 0); 616 617 /* Mark this channel as needing connect/setup */ 618 cifs_chan_set_need_reconnect(ses, chan->server); 619 620 spin_unlock(&ses->chan_lock); 621 622 mutex_lock(&ses->session_mutex); 623 /* 624 * We need to allocate the server crypto now as we will need 625 * to sign packets before we generate the channel signing key 626 * (we sign with the session key) 627 */ 628 rc = smb311_crypto_shash_allocate(chan->server); 629 if (rc) { 630 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__); 631 mutex_unlock(&ses->session_mutex); 632 goto out; 633 } 634 635 rc = cifs_negotiate_protocol(xid, ses, chan->server); 636 if (!rc) 637 rc = cifs_setup_session(xid, ses, chan->server, ses->local_nls); 638 639 mutex_unlock(&ses->session_mutex); 640 641 out: 642 if (rc && chan->server) { 643 cifs_put_tcp_session(chan->server, 0); 644 645 spin_lock(&ses->chan_lock); 646 647 /* we rely on all bits beyond chan_count to be clear */ 648 cifs_chan_clear_need_reconnect(ses, chan->server); 649 ses->chan_count--; 650 /* 651 * chan_count should never reach 0 as at least the primary 652 * channel is always allocated 653 */ 654 WARN_ON(ses->chan_count < 1); 655 spin_unlock(&ses->chan_lock); 656 } 657 658 kfree(ctx->UNC); 659 out_free_ctx: 660 kfree(ctx); 661 out_free_xid: 662 free_xid(xid); 663 return rc; 664 } 665 666 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 667 static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, 668 struct TCP_Server_Info *server, 669 SESSION_SETUP_ANDX *pSMB) 670 { 671 __u32 capabilities = 0; 672 673 /* init fields common to all four types of SessSetup */ 674 /* Note that offsets for first seven fields in req struct are same */ 675 /* in CIFS Specs so does not matter which of 3 forms of struct */ 676 /* that we use in next few lines */ 677 /* Note that header is initialized to zero in header_assemble */ 678 pSMB->req.AndXCommand = 0xFF; 679 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32, 680 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4, 681 USHRT_MAX)); 682 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq); 683 pSMB->req.VcNumber = cpu_to_le16(1); 684 685 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ 686 687 /* BB verify whether signing required on neg or just auth frame (and NTLM case) */ 688 689 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | 690 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; 691 692 if (server->sign) 693 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; 694 695 if (ses->capabilities & CAP_UNICODE) { 696 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; 697 capabilities |= CAP_UNICODE; 698 } 699 if (ses->capabilities & CAP_STATUS32) { 700 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; 701 capabilities |= CAP_STATUS32; 702 } 703 if (ses->capabilities & CAP_DFS) { 704 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; 705 capabilities |= CAP_DFS; 706 } 707 if (ses->capabilities & CAP_UNIX) 708 capabilities |= CAP_UNIX; 709 710 return capabilities; 711 } 712 713 static void 714 unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) 715 { 716 char *bcc_ptr = *pbcc_area; 717 int bytes_ret = 0; 718 719 /* Copy OS version */ 720 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32, 721 nls_cp); 722 bcc_ptr += 2 * bytes_ret; 723 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release, 724 32, nls_cp); 725 bcc_ptr += 2 * bytes_ret; 726 bcc_ptr += 2; /* trailing null */ 727 728 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, 729 32, nls_cp); 730 bcc_ptr += 2 * bytes_ret; 731 bcc_ptr += 2; /* trailing null */ 732 733 *pbcc_area = bcc_ptr; 734 } 735 736 static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, 737 const struct nls_table *nls_cp) 738 { 739 char *bcc_ptr = *pbcc_area; 740 int bytes_ret = 0; 741 742 /* copy domain */ 743 if (ses->domainName == NULL) { 744 /* 745 * Sending null domain better than using a bogus domain name (as 746 * we did briefly in 2.6.18) since server will use its default 747 */ 748 *bcc_ptr = 0; 749 *(bcc_ptr+1) = 0; 750 bytes_ret = 0; 751 } else 752 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, 753 CIFS_MAX_DOMAINNAME_LEN, nls_cp); 754 bcc_ptr += 2 * bytes_ret; 755 bcc_ptr += 2; /* account for null terminator */ 756 757 *pbcc_area = bcc_ptr; 758 } 759 760 static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 761 const struct nls_table *nls_cp) 762 { 763 char *bcc_ptr = *pbcc_area; 764 int bytes_ret = 0; 765 766 /* BB FIXME add check that strings less than 335 or will need to send as arrays */ 767 768 /* copy user */ 769 if (ses->user_name == NULL) { 770 /* null user mount */ 771 *bcc_ptr = 0; 772 *(bcc_ptr+1) = 0; 773 } else { 774 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name, 775 CIFS_MAX_USERNAME_LEN, nls_cp); 776 } 777 bcc_ptr += 2 * bytes_ret; 778 bcc_ptr += 2; /* account for null termination */ 779 780 unicode_domain_string(&bcc_ptr, ses, nls_cp); 781 unicode_oslm_strings(&bcc_ptr, nls_cp); 782 783 *pbcc_area = bcc_ptr; 784 } 785 786 static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 787 const struct nls_table *nls_cp) 788 { 789 char *bcc_ptr = *pbcc_area; 790 int len; 791 792 /* copy user */ 793 /* BB what about null user mounts - check that we do this BB */ 794 /* copy user */ 795 if (ses->user_name != NULL) { 796 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN); 797 if (WARN_ON_ONCE(len < 0)) 798 len = CIFS_MAX_USERNAME_LEN - 1; 799 bcc_ptr += len; 800 } 801 /* else null user mount */ 802 *bcc_ptr = 0; 803 bcc_ptr++; /* account for null termination */ 804 805 /* copy domain */ 806 if (ses->domainName != NULL) { 807 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 808 if (WARN_ON_ONCE(len < 0)) 809 len = CIFS_MAX_DOMAINNAME_LEN - 1; 810 bcc_ptr += len; 811 } /* else we send a null domain name so server will default to its own domain */ 812 *bcc_ptr = 0; 813 bcc_ptr++; 814 815 /* BB check for overflow here */ 816 817 strcpy(bcc_ptr, "Linux version "); 818 bcc_ptr += strlen("Linux version "); 819 strcpy(bcc_ptr, init_utsname()->release); 820 bcc_ptr += strlen(init_utsname()->release) + 1; 821 822 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); 823 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; 824 825 *pbcc_area = bcc_ptr; 826 } 827 828 static void 829 decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses, 830 const struct nls_table *nls_cp) 831 { 832 int len; 833 char *data = *pbcc_area; 834 835 cifs_dbg(FYI, "bleft %d\n", bleft); 836 837 kfree(ses->serverOS); 838 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 839 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS); 840 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 841 data += len; 842 bleft -= len; 843 if (bleft <= 0) 844 return; 845 846 kfree(ses->serverNOS); 847 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 848 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS); 849 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 850 data += len; 851 bleft -= len; 852 if (bleft <= 0) 853 return; 854 855 kfree(ses->serverDomain); 856 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 857 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain); 858 859 return; 860 } 861 862 static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft, 863 struct cifs_ses *ses, 864 const struct nls_table *nls_cp) 865 { 866 int len; 867 char *bcc_ptr = *pbcc_area; 868 869 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft); 870 871 len = strnlen(bcc_ptr, bleft); 872 if (len >= bleft) 873 return; 874 875 kfree(ses->serverOS); 876 877 ses->serverOS = kmalloc(len + 1, GFP_KERNEL); 878 if (ses->serverOS) { 879 memcpy(ses->serverOS, bcc_ptr, len); 880 ses->serverOS[len] = 0; 881 if (strncmp(ses->serverOS, "OS/2", 4) == 0) 882 cifs_dbg(FYI, "OS/2 server\n"); 883 } 884 885 bcc_ptr += len + 1; 886 bleft -= len + 1; 887 888 len = strnlen(bcc_ptr, bleft); 889 if (len >= bleft) 890 return; 891 892 kfree(ses->serverNOS); 893 894 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL); 895 if (ses->serverNOS) { 896 memcpy(ses->serverNOS, bcc_ptr, len); 897 ses->serverNOS[len] = 0; 898 } 899 900 bcc_ptr += len + 1; 901 bleft -= len + 1; 902 903 len = strnlen(bcc_ptr, bleft); 904 if (len > bleft) 905 return; 906 907 /* 908 * No domain field in LANMAN case. Domain is 909 * returned by old servers in the SMB negprot response 910 * 911 * BB For newer servers which do not support Unicode, 912 * but thus do return domain here, we could add parsing 913 * for it later, but it is not very important 914 */ 915 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft); 916 } 917 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 918 919 int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, 920 struct cifs_ses *ses) 921 { 922 unsigned int tioffset; /* challenge message target info area */ 923 unsigned int tilen; /* challenge message target info area length */ 924 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; 925 __u32 server_flags; 926 927 if (blob_len < sizeof(CHALLENGE_MESSAGE)) { 928 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len); 929 return -EINVAL; 930 } 931 932 if (memcmp(pblob->Signature, "NTLMSSP", 8)) { 933 cifs_dbg(VFS, "blob signature incorrect %s\n", 934 pblob->Signature); 935 return -EINVAL; 936 } 937 if (pblob->MessageType != NtLmChallenge) { 938 cifs_dbg(VFS, "Incorrect message type %d\n", 939 pblob->MessageType); 940 return -EINVAL; 941 } 942 943 server_flags = le32_to_cpu(pblob->NegotiateFlags); 944 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__, 945 ses->ntlmssp->client_flags, server_flags); 946 947 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) && 948 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) { 949 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n", 950 __func__); 951 return -EINVAL; 952 } 953 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) { 954 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__); 955 return -EINVAL; 956 } 957 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) { 958 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n", 959 __func__); 960 return -EOPNOTSUPP; 961 } 962 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) && 963 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH)) 964 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n", 965 __func__); 966 967 ses->ntlmssp->server_flags = server_flags; 968 969 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); 970 /* 971 * In particular we can examine sign flags 972 * 973 * BB spec says that if AvId field of MsvAvTimestamp is populated then 974 * we must set the MIC field of the AUTHENTICATE_MESSAGE 975 */ 976 977 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset); 978 tilen = le16_to_cpu(pblob->TargetInfoArray.Length); 979 if (tioffset > blob_len || tioffset + tilen > blob_len) { 980 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n", 981 tioffset, tilen); 982 return -EINVAL; 983 } 984 if (tilen) { 985 kfree_sensitive(ses->auth_key.response); 986 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen, 987 GFP_KERNEL); 988 if (!ses->auth_key.response) { 989 cifs_dbg(VFS, "Challenge target info alloc failure\n"); 990 return -ENOMEM; 991 } 992 ses->auth_key.len = tilen; 993 } 994 995 return 0; 996 } 997 998 static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size) 999 { 1000 int sz = base_size + ses->auth_key.len 1001 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2; 1002 1003 if (ses->domainName) 1004 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 1005 else 1006 sz += sizeof(__le16); 1007 1008 if (ses->user_name) 1009 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN); 1010 else 1011 sz += sizeof(__le16); 1012 1013 if (ses->workstation_name[0]) 1014 sz += sizeof(__le16) * strnlen(ses->workstation_name, 1015 ntlmssp_workstation_name_size(ses)); 1016 else 1017 sz += sizeof(__le16); 1018 1019 return sz; 1020 } 1021 1022 static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf, 1023 char *str_value, 1024 int str_length, 1025 unsigned char *pstart, 1026 unsigned char **pcur, 1027 const struct nls_table *nls_cp) 1028 { 1029 unsigned char *tmp = pstart; 1030 int len; 1031 1032 if (!pbuf) 1033 return; 1034 1035 if (!pcur) 1036 pcur = &tmp; 1037 1038 if (!str_value) { 1039 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart); 1040 pbuf->Length = 0; 1041 pbuf->MaximumLength = 0; 1042 *pcur += sizeof(__le16); 1043 } else { 1044 len = cifs_strtoUTF16((__le16 *)*pcur, 1045 str_value, 1046 str_length, 1047 nls_cp); 1048 len *= sizeof(__le16); 1049 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart); 1050 pbuf->Length = cpu_to_le16(len); 1051 pbuf->MaximumLength = cpu_to_le16(len); 1052 *pcur += len; 1053 } 1054 } 1055 1056 /* BB Move to ntlmssp.c eventually */ 1057 1058 int build_ntlmssp_negotiate_blob(unsigned char **pbuffer, 1059 u16 *buflen, 1060 struct cifs_ses *ses, 1061 struct TCP_Server_Info *server, 1062 const struct nls_table *nls_cp) 1063 { 1064 int rc = 0; 1065 NEGOTIATE_MESSAGE *sec_blob; 1066 __u32 flags; 1067 unsigned char *tmp; 1068 int len; 1069 1070 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE)); 1071 *pbuffer = kmalloc(len, GFP_KERNEL); 1072 if (!*pbuffer) { 1073 rc = -ENOMEM; 1074 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1075 *buflen = 0; 1076 goto setup_ntlm_neg_ret; 1077 } 1078 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer; 1079 1080 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE)); 1081 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1082 sec_blob->MessageType = NtLmNegotiate; 1083 1084 /* BB is NTLMV2 session security format easier to use here? */ 1085 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 1086 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 1087 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC | 1088 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL | 1089 NTLMSSP_NEGOTIATE_SIGN; 1090 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess) 1091 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 1092 1093 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE); 1094 ses->ntlmssp->client_flags = flags; 1095 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1096 1097 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */ 1098 cifs_security_buffer_from_str(&sec_blob->DomainName, 1099 NULL, 1100 CIFS_MAX_DOMAINNAME_LEN, 1101 *pbuffer, &tmp, 1102 nls_cp); 1103 1104 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1105 NULL, 1106 CIFS_MAX_WORKSTATION_LEN, 1107 *pbuffer, &tmp, 1108 nls_cp); 1109 1110 *buflen = tmp - *pbuffer; 1111 setup_ntlm_neg_ret: 1112 return rc; 1113 } 1114 1115 /* 1116 * Build ntlmssp blob with additional fields, such as version, 1117 * supported by modern servers. For safety limit to SMB3 or later 1118 * See notes in MS-NLMP Section 2.2.2.1 e.g. 1119 */ 1120 int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer, 1121 u16 *buflen, 1122 struct cifs_ses *ses, 1123 struct TCP_Server_Info *server, 1124 const struct nls_table *nls_cp) 1125 { 1126 int rc = 0; 1127 struct negotiate_message *sec_blob; 1128 __u32 flags; 1129 unsigned char *tmp; 1130 int len; 1131 1132 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message)); 1133 *pbuffer = kmalloc(len, GFP_KERNEL); 1134 if (!*pbuffer) { 1135 rc = -ENOMEM; 1136 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1137 *buflen = 0; 1138 goto setup_ntlm_smb3_neg_ret; 1139 } 1140 sec_blob = (struct negotiate_message *)*pbuffer; 1141 1142 memset(*pbuffer, 0, sizeof(struct negotiate_message)); 1143 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1144 sec_blob->MessageType = NtLmNegotiate; 1145 1146 /* BB is NTLMV2 session security format easier to use here? */ 1147 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 1148 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 1149 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC | 1150 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL | 1151 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION; 1152 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess) 1153 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 1154 1155 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR; 1156 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL; 1157 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD); 1158 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3; 1159 1160 tmp = *pbuffer + sizeof(struct negotiate_message); 1161 ses->ntlmssp->client_flags = flags; 1162 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1163 1164 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */ 1165 cifs_security_buffer_from_str(&sec_blob->DomainName, 1166 NULL, 1167 CIFS_MAX_DOMAINNAME_LEN, 1168 *pbuffer, &tmp, 1169 nls_cp); 1170 1171 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1172 NULL, 1173 CIFS_MAX_WORKSTATION_LEN, 1174 *pbuffer, &tmp, 1175 nls_cp); 1176 1177 *buflen = tmp - *pbuffer; 1178 setup_ntlm_smb3_neg_ret: 1179 return rc; 1180 } 1181 1182 1183 /* See MS-NLMP 2.2.1.3 */ 1184 int build_ntlmssp_auth_blob(unsigned char **pbuffer, 1185 u16 *buflen, 1186 struct cifs_ses *ses, 1187 struct TCP_Server_Info *server, 1188 const struct nls_table *nls_cp) 1189 { 1190 int rc; 1191 AUTHENTICATE_MESSAGE *sec_blob; 1192 __u32 flags; 1193 unsigned char *tmp; 1194 int len; 1195 1196 rc = setup_ntlmv2_rsp(ses, nls_cp); 1197 if (rc) { 1198 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc); 1199 *buflen = 0; 1200 goto setup_ntlmv2_ret; 1201 } 1202 1203 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE)); 1204 *pbuffer = kmalloc(len, GFP_KERNEL); 1205 if (!*pbuffer) { 1206 rc = -ENOMEM; 1207 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc); 1208 *buflen = 0; 1209 goto setup_ntlmv2_ret; 1210 } 1211 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer; 1212 1213 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 1214 sec_blob->MessageType = NtLmAuthenticate; 1215 1216 /* send version information in ntlmssp authenticate also */ 1217 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET | 1218 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_VERSION | 1219 NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED; 1220 1221 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR; 1222 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL; 1223 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD); 1224 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3; 1225 1226 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE); 1227 sec_blob->NegotiateFlags = cpu_to_le32(flags); 1228 1229 sec_blob->LmChallengeResponse.BufferOffset = 1230 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); 1231 sec_blob->LmChallengeResponse.Length = 0; 1232 sec_blob->LmChallengeResponse.MaximumLength = 0; 1233 1234 sec_blob->NtChallengeResponse.BufferOffset = 1235 cpu_to_le32(tmp - *pbuffer); 1236 if (ses->user_name != NULL) { 1237 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 1238 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1239 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 1240 1241 sec_blob->NtChallengeResponse.Length = 1242 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1243 sec_blob->NtChallengeResponse.MaximumLength = 1244 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1245 } else { 1246 /* 1247 * don't send an NT Response for anonymous access 1248 */ 1249 sec_blob->NtChallengeResponse.Length = 0; 1250 sec_blob->NtChallengeResponse.MaximumLength = 0; 1251 } 1252 1253 cifs_security_buffer_from_str(&sec_blob->DomainName, 1254 ses->domainName, 1255 CIFS_MAX_DOMAINNAME_LEN, 1256 *pbuffer, &tmp, 1257 nls_cp); 1258 1259 cifs_security_buffer_from_str(&sec_blob->UserName, 1260 ses->user_name, 1261 CIFS_MAX_USERNAME_LEN, 1262 *pbuffer, &tmp, 1263 nls_cp); 1264 1265 cifs_security_buffer_from_str(&sec_blob->WorkstationName, 1266 ses->workstation_name, 1267 ntlmssp_workstation_name_size(ses), 1268 *pbuffer, &tmp, 1269 nls_cp); 1270 1271 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) && 1272 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) && 1273 !calc_seckey(ses)) { 1274 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); 1275 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); 1276 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE); 1277 sec_blob->SessionKey.MaximumLength = 1278 cpu_to_le16(CIFS_CPHTXT_SIZE); 1279 tmp += CIFS_CPHTXT_SIZE; 1280 } else { 1281 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer); 1282 sec_blob->SessionKey.Length = 0; 1283 sec_blob->SessionKey.MaximumLength = 0; 1284 } 1285 1286 *buflen = tmp - *pbuffer; 1287 setup_ntlmv2_ret: 1288 return rc; 1289 } 1290 1291 enum securityEnum 1292 cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) 1293 { 1294 switch (server->negflavor) { 1295 case CIFS_NEGFLAVOR_EXTENDED: 1296 switch (requested) { 1297 case Kerberos: 1298 case RawNTLMSSP: 1299 return requested; 1300 case Unspecified: 1301 if (server->sec_ntlmssp && 1302 (global_secflags & CIFSSEC_MAY_NTLMSSP)) 1303 return RawNTLMSSP; 1304 if ((server->sec_kerberos || server->sec_mskerberos) && 1305 (global_secflags & CIFSSEC_MAY_KRB5)) 1306 return Kerberos; 1307 fallthrough; 1308 default: 1309 return Unspecified; 1310 } 1311 case CIFS_NEGFLAVOR_UNENCAP: 1312 switch (requested) { 1313 case NTLMv2: 1314 return requested; 1315 case Unspecified: 1316 if (global_secflags & CIFSSEC_MAY_NTLMV2) 1317 return NTLMv2; 1318 break; 1319 default: 1320 break; 1321 } 1322 fallthrough; 1323 default: 1324 return Unspecified; 1325 } 1326 } 1327 1328 struct sess_data { 1329 unsigned int xid; 1330 struct cifs_ses *ses; 1331 struct TCP_Server_Info *server; 1332 struct nls_table *nls_cp; 1333 void (*func)(struct sess_data *); 1334 int result; 1335 1336 /* we will send the SMB in three pieces: 1337 * a fixed length beginning part, an optional 1338 * SPNEGO blob (which can be zero length), and a 1339 * last part which will include the strings 1340 * and rest of bcc area. This allows us to avoid 1341 * a large buffer 17K allocation 1342 */ 1343 int buf0_type; 1344 struct kvec iov[3]; 1345 }; 1346 1347 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 1348 static int 1349 sess_alloc_buffer(struct sess_data *sess_data, int wct) 1350 { 1351 int rc; 1352 struct cifs_ses *ses = sess_data->ses; 1353 struct smb_hdr *smb_buf; 1354 1355 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, 1356 (void **)&smb_buf); 1357 1358 if (rc) 1359 return rc; 1360 1361 sess_data->iov[0].iov_base = (char *)smb_buf; 1362 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; 1363 /* 1364 * This variable will be used to clear the buffer 1365 * allocated above in case of any error in the calling function. 1366 */ 1367 sess_data->buf0_type = CIFS_SMALL_BUFFER; 1368 1369 /* 2000 big enough to fit max user, domain, NOS name etc. */ 1370 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL); 1371 if (!sess_data->iov[2].iov_base) { 1372 rc = -ENOMEM; 1373 goto out_free_smb_buf; 1374 } 1375 1376 return 0; 1377 1378 out_free_smb_buf: 1379 cifs_small_buf_release(smb_buf); 1380 sess_data->iov[0].iov_base = NULL; 1381 sess_data->iov[0].iov_len = 0; 1382 sess_data->buf0_type = CIFS_NO_BUFFER; 1383 return rc; 1384 } 1385 1386 static void 1387 sess_free_buffer(struct sess_data *sess_data) 1388 { 1389 struct kvec *iov = sess_data->iov; 1390 1391 /* 1392 * Zero the session data before freeing, as it might contain sensitive info (keys, etc). 1393 * Note that iov[1] is already freed by caller. 1394 */ 1395 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base) 1396 memzero_explicit(iov[0].iov_base, iov[0].iov_len); 1397 1398 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base); 1399 sess_data->buf0_type = CIFS_NO_BUFFER; 1400 kfree_sensitive(iov[2].iov_base); 1401 } 1402 1403 static int 1404 sess_establish_session(struct sess_data *sess_data) 1405 { 1406 struct cifs_ses *ses = sess_data->ses; 1407 struct TCP_Server_Info *server = sess_data->server; 1408 1409 cifs_server_lock(server); 1410 if (!server->session_estab) { 1411 if (server->sign) { 1412 server->session_key.response = 1413 kmemdup(ses->auth_key.response, 1414 ses->auth_key.len, GFP_KERNEL); 1415 if (!server->session_key.response) { 1416 cifs_server_unlock(server); 1417 return -ENOMEM; 1418 } 1419 server->session_key.len = 1420 ses->auth_key.len; 1421 } 1422 server->sequence_number = 0x2; 1423 server->session_estab = true; 1424 } 1425 cifs_server_unlock(server); 1426 1427 cifs_dbg(FYI, "CIFS session established successfully\n"); 1428 return 0; 1429 } 1430 1431 static int 1432 sess_sendreceive(struct sess_data *sess_data) 1433 { 1434 int rc; 1435 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base; 1436 __u16 count; 1437 struct kvec rsp_iov = { NULL, 0 }; 1438 1439 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len; 1440 be32_add_cpu(&smb_buf->smb_buf_length, count); 1441 put_bcc(count, smb_buf); 1442 1443 rc = SendReceive2(sess_data->xid, sess_data->ses, 1444 sess_data->iov, 3 /* num_iovecs */, 1445 &sess_data->buf0_type, 1446 CIFS_LOG_ERROR, &rsp_iov); 1447 cifs_small_buf_release(sess_data->iov[0].iov_base); 1448 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); 1449 1450 return rc; 1451 } 1452 1453 static void 1454 sess_auth_ntlmv2(struct sess_data *sess_data) 1455 { 1456 int rc = 0; 1457 struct smb_hdr *smb_buf; 1458 SESSION_SETUP_ANDX *pSMB; 1459 char *bcc_ptr; 1460 struct cifs_ses *ses = sess_data->ses; 1461 struct TCP_Server_Info *server = sess_data->server; 1462 __u32 capabilities; 1463 __u16 bytes_remaining; 1464 1465 /* old style NTLM sessionsetup */ 1466 /* wct = 13 */ 1467 rc = sess_alloc_buffer(sess_data, 13); 1468 if (rc) 1469 goto out; 1470 1471 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1472 bcc_ptr = sess_data->iov[2].iov_base; 1473 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1474 1475 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 1476 1477 /* LM2 password would be here if we supported it */ 1478 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; 1479 1480 if (ses->user_name != NULL) { 1481 /* calculate nlmv2 response and session key */ 1482 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp); 1483 if (rc) { 1484 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc); 1485 goto out; 1486 } 1487 1488 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 1489 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1490 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 1491 1492 /* set case sensitive password length after tilen may get 1493 * assigned, tilen is 0 otherwise. 1494 */ 1495 pSMB->req_no_secext.CaseSensitivePasswordLength = 1496 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 1497 } else { 1498 pSMB->req_no_secext.CaseSensitivePasswordLength = 0; 1499 } 1500 1501 if (ses->capabilities & CAP_UNICODE) { 1502 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) { 1503 *bcc_ptr = 0; 1504 bcc_ptr++; 1505 } 1506 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1507 } else { 1508 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1509 } 1510 1511 1512 sess_data->iov[2].iov_len = (long) bcc_ptr - 1513 (long) sess_data->iov[2].iov_base; 1514 1515 rc = sess_sendreceive(sess_data); 1516 if (rc) 1517 goto out; 1518 1519 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1520 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1521 1522 if (smb_buf->WordCount != 3) { 1523 rc = -EIO; 1524 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1525 goto out; 1526 } 1527 1528 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1529 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1530 1531 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1532 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1533 1534 bytes_remaining = get_bcc(smb_buf); 1535 bcc_ptr = pByteArea(smb_buf); 1536 1537 /* BB check if Unicode and decode strings */ 1538 if (bytes_remaining == 0) { 1539 /* no string area to decode, do nothing */ 1540 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1541 /* unicode string area must be word-aligned */ 1542 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1543 ++bcc_ptr; 1544 --bytes_remaining; 1545 } 1546 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1547 sess_data->nls_cp); 1548 } else { 1549 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1550 sess_data->nls_cp); 1551 } 1552 1553 rc = sess_establish_session(sess_data); 1554 out: 1555 sess_data->result = rc; 1556 sess_data->func = NULL; 1557 sess_free_buffer(sess_data); 1558 kfree_sensitive(ses->auth_key.response); 1559 ses->auth_key.response = NULL; 1560 } 1561 1562 #ifdef CONFIG_CIFS_UPCALL 1563 static void 1564 sess_auth_kerberos(struct sess_data *sess_data) 1565 { 1566 int rc = 0; 1567 struct smb_hdr *smb_buf; 1568 SESSION_SETUP_ANDX *pSMB; 1569 char *bcc_ptr; 1570 struct cifs_ses *ses = sess_data->ses; 1571 struct TCP_Server_Info *server = sess_data->server; 1572 __u32 capabilities; 1573 __u16 bytes_remaining; 1574 struct key *spnego_key = NULL; 1575 struct cifs_spnego_msg *msg; 1576 u16 blob_len; 1577 1578 /* extended security */ 1579 /* wct = 12 */ 1580 rc = sess_alloc_buffer(sess_data, 12); 1581 if (rc) 1582 goto out; 1583 1584 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1585 bcc_ptr = sess_data->iov[2].iov_base; 1586 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1587 1588 spnego_key = cifs_get_spnego_key(ses, server); 1589 if (IS_ERR(spnego_key)) { 1590 rc = PTR_ERR(spnego_key); 1591 spnego_key = NULL; 1592 goto out; 1593 } 1594 1595 msg = spnego_key->payload.data[0]; 1596 /* 1597 * check version field to make sure that cifs.upcall is 1598 * sending us a response in an expected form 1599 */ 1600 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 1601 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n", 1602 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 1603 rc = -EKEYREJECTED; 1604 goto out_put_spnego_key; 1605 } 1606 1607 kfree_sensitive(ses->auth_key.response); 1608 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, 1609 GFP_KERNEL); 1610 if (!ses->auth_key.response) { 1611 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n", 1612 msg->sesskey_len); 1613 rc = -ENOMEM; 1614 goto out_put_spnego_key; 1615 } 1616 ses->auth_key.len = msg->sesskey_len; 1617 1618 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1619 capabilities |= CAP_EXTENDED_SECURITY; 1620 pSMB->req.Capabilities = cpu_to_le32(capabilities); 1621 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; 1622 sess_data->iov[1].iov_len = msg->secblob_len; 1623 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len); 1624 1625 if (ses->capabilities & CAP_UNICODE) { 1626 /* unicode strings must be word aligned */ 1627 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1628 *bcc_ptr = 0; 1629 bcc_ptr++; 1630 } 1631 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1632 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp); 1633 } else { 1634 /* BB: is this right? */ 1635 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1636 } 1637 1638 sess_data->iov[2].iov_len = (long) bcc_ptr - 1639 (long) sess_data->iov[2].iov_base; 1640 1641 rc = sess_sendreceive(sess_data); 1642 if (rc) 1643 goto out_put_spnego_key; 1644 1645 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1646 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1647 1648 if (smb_buf->WordCount != 4) { 1649 rc = -EIO; 1650 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1651 goto out_put_spnego_key; 1652 } 1653 1654 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1655 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1656 1657 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1658 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1659 1660 bytes_remaining = get_bcc(smb_buf); 1661 bcc_ptr = pByteArea(smb_buf); 1662 1663 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1664 if (blob_len > bytes_remaining) { 1665 cifs_dbg(VFS, "bad security blob length %d\n", 1666 blob_len); 1667 rc = -EINVAL; 1668 goto out_put_spnego_key; 1669 } 1670 bcc_ptr += blob_len; 1671 bytes_remaining -= blob_len; 1672 1673 /* BB check if Unicode and decode strings */ 1674 if (bytes_remaining == 0) { 1675 /* no string area to decode, do nothing */ 1676 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1677 /* unicode string area must be word-aligned */ 1678 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1679 ++bcc_ptr; 1680 --bytes_remaining; 1681 } 1682 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1683 sess_data->nls_cp); 1684 } else { 1685 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1686 sess_data->nls_cp); 1687 } 1688 1689 rc = sess_establish_session(sess_data); 1690 out_put_spnego_key: 1691 key_invalidate(spnego_key); 1692 key_put(spnego_key); 1693 out: 1694 sess_data->result = rc; 1695 sess_data->func = NULL; 1696 sess_free_buffer(sess_data); 1697 kfree_sensitive(ses->auth_key.response); 1698 ses->auth_key.response = NULL; 1699 } 1700 1701 #endif /* ! CONFIG_CIFS_UPCALL */ 1702 1703 /* 1704 * The required kvec buffers have to be allocated before calling this 1705 * function. 1706 */ 1707 static int 1708 _sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data) 1709 { 1710 SESSION_SETUP_ANDX *pSMB; 1711 struct cifs_ses *ses = sess_data->ses; 1712 struct TCP_Server_Info *server = sess_data->server; 1713 __u32 capabilities; 1714 char *bcc_ptr; 1715 1716 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1717 1718 capabilities = cifs_ssetup_hdr(ses, server, pSMB); 1719 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { 1720 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n"); 1721 return -ENOSYS; 1722 } 1723 1724 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1725 capabilities |= CAP_EXTENDED_SECURITY; 1726 pSMB->req.Capabilities |= cpu_to_le32(capabilities); 1727 1728 bcc_ptr = sess_data->iov[2].iov_base; 1729 /* unicode strings must be word aligned */ 1730 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) { 1731 *bcc_ptr = 0; 1732 bcc_ptr++; 1733 } 1734 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1735 1736 sess_data->iov[2].iov_len = (long) bcc_ptr - 1737 (long) sess_data->iov[2].iov_base; 1738 1739 return 0; 1740 } 1741 1742 static void 1743 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data); 1744 1745 static void 1746 sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data) 1747 { 1748 int rc; 1749 struct smb_hdr *smb_buf; 1750 SESSION_SETUP_ANDX *pSMB; 1751 struct cifs_ses *ses = sess_data->ses; 1752 struct TCP_Server_Info *server = sess_data->server; 1753 __u16 bytes_remaining; 1754 char *bcc_ptr; 1755 unsigned char *ntlmsspblob = NULL; 1756 u16 blob_len; 1757 1758 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n"); 1759 1760 /* 1761 * if memory allocation is successful, caller of this function 1762 * frees it. 1763 */ 1764 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); 1765 if (!ses->ntlmssp) { 1766 rc = -ENOMEM; 1767 goto out; 1768 } 1769 ses->ntlmssp->sesskey_per_smbsess = false; 1770 1771 /* wct = 12 */ 1772 rc = sess_alloc_buffer(sess_data, 12); 1773 if (rc) 1774 goto out; 1775 1776 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1777 1778 /* Build security blob before we assemble the request */ 1779 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob, 1780 &blob_len, ses, server, 1781 sess_data->nls_cp); 1782 if (rc) 1783 goto out_free_ntlmsspblob; 1784 1785 sess_data->iov[1].iov_len = blob_len; 1786 sess_data->iov[1].iov_base = ntlmsspblob; 1787 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1788 1789 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1790 if (rc) 1791 goto out_free_ntlmsspblob; 1792 1793 rc = sess_sendreceive(sess_data); 1794 1795 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1796 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1797 1798 /* If true, rc here is expected and not an error */ 1799 if (sess_data->buf0_type != CIFS_NO_BUFFER && 1800 smb_buf->Status.CifsError == 1801 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)) 1802 rc = 0; 1803 1804 if (rc) 1805 goto out_free_ntlmsspblob; 1806 1807 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); 1808 1809 if (smb_buf->WordCount != 4) { 1810 rc = -EIO; 1811 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1812 goto out_free_ntlmsspblob; 1813 } 1814 1815 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1816 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1817 1818 bytes_remaining = get_bcc(smb_buf); 1819 bcc_ptr = pByteArea(smb_buf); 1820 1821 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1822 if (blob_len > bytes_remaining) { 1823 cifs_dbg(VFS, "bad security blob length %d\n", 1824 blob_len); 1825 rc = -EINVAL; 1826 goto out_free_ntlmsspblob; 1827 } 1828 1829 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); 1830 1831 out_free_ntlmsspblob: 1832 kfree_sensitive(ntlmsspblob); 1833 out: 1834 sess_free_buffer(sess_data); 1835 1836 if (!rc) { 1837 sess_data->func = sess_auth_rawntlmssp_authenticate; 1838 return; 1839 } 1840 1841 /* Else error. Cleanup */ 1842 kfree_sensitive(ses->auth_key.response); 1843 ses->auth_key.response = NULL; 1844 kfree_sensitive(ses->ntlmssp); 1845 ses->ntlmssp = NULL; 1846 1847 sess_data->func = NULL; 1848 sess_data->result = rc; 1849 } 1850 1851 static void 1852 sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data) 1853 { 1854 int rc; 1855 struct smb_hdr *smb_buf; 1856 SESSION_SETUP_ANDX *pSMB; 1857 struct cifs_ses *ses = sess_data->ses; 1858 struct TCP_Server_Info *server = sess_data->server; 1859 __u16 bytes_remaining; 1860 char *bcc_ptr; 1861 unsigned char *ntlmsspblob = NULL; 1862 u16 blob_len; 1863 1864 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n"); 1865 1866 /* wct = 12 */ 1867 rc = sess_alloc_buffer(sess_data, 12); 1868 if (rc) 1869 goto out; 1870 1871 /* Build security blob before we assemble the request */ 1872 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1873 smb_buf = (struct smb_hdr *)pSMB; 1874 rc = build_ntlmssp_auth_blob(&ntlmsspblob, 1875 &blob_len, ses, server, 1876 sess_data->nls_cp); 1877 if (rc) 1878 goto out_free_ntlmsspblob; 1879 sess_data->iov[1].iov_len = blob_len; 1880 sess_data->iov[1].iov_base = ntlmsspblob; 1881 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1882 /* 1883 * Make sure that we tell the server that we are using 1884 * the uid that it just gave us back on the response 1885 * (challenge) 1886 */ 1887 smb_buf->Uid = ses->Suid; 1888 1889 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1890 if (rc) 1891 goto out_free_ntlmsspblob; 1892 1893 rc = sess_sendreceive(sess_data); 1894 if (rc) 1895 goto out_free_ntlmsspblob; 1896 1897 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1898 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1899 if (smb_buf->WordCount != 4) { 1900 rc = -EIO; 1901 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1902 goto out_free_ntlmsspblob; 1903 } 1904 1905 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1906 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1907 1908 if (ses->Suid != smb_buf->Uid) { 1909 ses->Suid = smb_buf->Uid; 1910 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid); 1911 } 1912 1913 bytes_remaining = get_bcc(smb_buf); 1914 bcc_ptr = pByteArea(smb_buf); 1915 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1916 if (blob_len > bytes_remaining) { 1917 cifs_dbg(VFS, "bad security blob length %d\n", 1918 blob_len); 1919 rc = -EINVAL; 1920 goto out_free_ntlmsspblob; 1921 } 1922 bcc_ptr += blob_len; 1923 bytes_remaining -= blob_len; 1924 1925 1926 /* BB check if Unicode and decode strings */ 1927 if (bytes_remaining == 0) { 1928 /* no string area to decode, do nothing */ 1929 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1930 /* unicode string area must be word-aligned */ 1931 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) { 1932 ++bcc_ptr; 1933 --bytes_remaining; 1934 } 1935 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1936 sess_data->nls_cp); 1937 } else { 1938 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1939 sess_data->nls_cp); 1940 } 1941 1942 out_free_ntlmsspblob: 1943 kfree_sensitive(ntlmsspblob); 1944 out: 1945 sess_free_buffer(sess_data); 1946 1947 if (!rc) 1948 rc = sess_establish_session(sess_data); 1949 1950 /* Cleanup */ 1951 kfree_sensitive(ses->auth_key.response); 1952 ses->auth_key.response = NULL; 1953 kfree_sensitive(ses->ntlmssp); 1954 ses->ntlmssp = NULL; 1955 1956 sess_data->func = NULL; 1957 sess_data->result = rc; 1958 } 1959 1960 static int select_sec(struct sess_data *sess_data) 1961 { 1962 int type; 1963 struct cifs_ses *ses = sess_data->ses; 1964 struct TCP_Server_Info *server = sess_data->server; 1965 1966 type = cifs_select_sectype(server, ses->sectype); 1967 cifs_dbg(FYI, "sess setup type %d\n", type); 1968 if (type == Unspecified) { 1969 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n"); 1970 return -EINVAL; 1971 } 1972 1973 switch (type) { 1974 case NTLMv2: 1975 sess_data->func = sess_auth_ntlmv2; 1976 break; 1977 case Kerberos: 1978 #ifdef CONFIG_CIFS_UPCALL 1979 sess_data->func = sess_auth_kerberos; 1980 break; 1981 #else 1982 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); 1983 return -ENOSYS; 1984 #endif /* CONFIG_CIFS_UPCALL */ 1985 case RawNTLMSSP: 1986 sess_data->func = sess_auth_rawntlmssp_negotiate; 1987 break; 1988 default: 1989 cifs_dbg(VFS, "secType %d not supported!\n", type); 1990 return -ENOSYS; 1991 } 1992 1993 return 0; 1994 } 1995 1996 int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, 1997 struct TCP_Server_Info *server, 1998 const struct nls_table *nls_cp) 1999 { 2000 int rc = 0; 2001 struct sess_data *sess_data; 2002 2003 if (ses == NULL) { 2004 WARN(1, "%s: ses == NULL!", __func__); 2005 return -EINVAL; 2006 } 2007 2008 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL); 2009 if (!sess_data) 2010 return -ENOMEM; 2011 2012 sess_data->xid = xid; 2013 sess_data->ses = ses; 2014 sess_data->server = server; 2015 sess_data->buf0_type = CIFS_NO_BUFFER; 2016 sess_data->nls_cp = (struct nls_table *) nls_cp; 2017 2018 rc = select_sec(sess_data); 2019 if (rc) 2020 goto out; 2021 2022 while (sess_data->func) 2023 sess_data->func(sess_data); 2024 2025 /* Store result before we free sess_data */ 2026 rc = sess_data->result; 2027 2028 out: 2029 kfree_sensitive(sess_data); 2030 return rc; 2031 } 2032 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 2033