sess.c revision 21e733930be6458e0c33482b6783e7c15ba984eb
1/* 2 * fs/cifs/sess.c 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 * This library is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU Lesser General Public License as published 11 * by the Free Software Foundation; either version 2.1 of the License, or 12 * (at your option) any later version. 13 * 14 * This library is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 17 * the GNU Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public License 20 * along with this library; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 */ 23 24#include "cifspdu.h" 25#include "cifsglob.h" 26#include "cifsproto.h" 27#include "cifs_unicode.h" 28#include "cifs_debug.h" 29#include "ntlmssp.h" 30#include "nterr.h" 31#include <linux/utsname.h> 32#include <linux/slab.h> 33#include "cifs_spnego.h" 34 35/* 36 * Checks if this is the first smb session to be reconnected after 37 * the socket has been reestablished (so we know whether to use vc 0). 38 * Called while holding the cifs_tcp_ses_lock, so do not block 39 */ 40static bool is_first_ses_reconnect(struct cifsSesInfo *ses) 41{ 42 struct list_head *tmp; 43 struct cifsSesInfo *tmp_ses; 44 45 list_for_each(tmp, &ses->server->smb_ses_list) { 46 tmp_ses = list_entry(tmp, struct cifsSesInfo, 47 smb_ses_list); 48 if (tmp_ses->need_reconnect == false) 49 return false; 50 } 51 /* could not find a session that was already connected, 52 this must be the first one we are reconnecting */ 53 return true; 54} 55 56/* 57 * vc number 0 is treated specially by some servers, and should be the 58 * first one we request. After that we can use vcnumbers up to maxvcs, 59 * one for each smb session (some Windows versions set maxvcs incorrectly 60 * so maxvc=1 can be ignored). If we have too many vcs, we can reuse 61 * any vc but zero (some servers reset the connection on vcnum zero) 62 * 63 */ 64static __le16 get_next_vcnum(struct cifsSesInfo *ses) 65{ 66 __u16 vcnum = 0; 67 struct list_head *tmp; 68 struct cifsSesInfo *tmp_ses; 69 __u16 max_vcs = ses->server->max_vcs; 70 __u16 i; 71 int free_vc_found = 0; 72 73 /* Quoting the MS-SMB specification: "Windows-based SMB servers set this 74 field to one but do not enforce this limit, which allows an SMB client 75 to establish more virtual circuits than allowed by this value ... but 76 other server implementations can enforce this limit." */ 77 if (max_vcs < 2) 78 max_vcs = 0xFFFF; 79 80 spin_lock(&cifs_tcp_ses_lock); 81 if ((ses->need_reconnect) && is_first_ses_reconnect(ses)) 82 goto get_vc_num_exit; /* vcnum will be zero */ 83 for (i = ses->server->srv_count - 1; i < max_vcs; i++) { 84 if (i == 0) /* this is the only connection, use vc 0 */ 85 break; 86 87 free_vc_found = 1; 88 89 list_for_each(tmp, &ses->server->smb_ses_list) { 90 tmp_ses = list_entry(tmp, struct cifsSesInfo, 91 smb_ses_list); 92 if (tmp_ses->vcnum == i) { 93 free_vc_found = 0; 94 break; /* found duplicate, try next vcnum */ 95 } 96 } 97 if (free_vc_found) 98 break; /* we found a vcnumber that will work - use it */ 99 } 100 101 if (i == 0) 102 vcnum = 0; /* for most common case, ie if one smb session, use 103 vc zero. Also for case when no free vcnum, zero 104 is safest to send (some clients only send zero) */ 105 else if (free_vc_found == 0) 106 vcnum = 1; /* we can not reuse vc=0 safely, since some servers 107 reset all uids on that, but 1 is ok. */ 108 else 109 vcnum = i; 110 ses->vcnum = vcnum; 111get_vc_num_exit: 112 spin_unlock(&cifs_tcp_ses_lock); 113 114 return cpu_to_le16(vcnum); 115} 116 117static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB) 118{ 119 __u32 capabilities = 0; 120 121 /* init fields common to all four types of SessSetup */ 122 /* Note that offsets for first seven fields in req struct are same */ 123 /* in CIFS Specs so does not matter which of 3 forms of struct */ 124 /* that we use in next few lines */ 125 /* Note that header is initialized to zero in header_assemble */ 126 pSMB->req.AndXCommand = 0xFF; 127 pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf); 128 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq); 129 pSMB->req.VcNumber = get_next_vcnum(ses); 130 131 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ 132 133 /* BB verify whether signing required on neg or just on auth frame 134 (and NTLM case) */ 135 136 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | 137 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; 138 139 if (ses->server->secMode & 140 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) 141 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; 142 143 if (ses->capabilities & CAP_UNICODE) { 144 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; 145 capabilities |= CAP_UNICODE; 146 } 147 if (ses->capabilities & CAP_STATUS32) { 148 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; 149 capabilities |= CAP_STATUS32; 150 } 151 if (ses->capabilities & CAP_DFS) { 152 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; 153 capabilities |= CAP_DFS; 154 } 155 if (ses->capabilities & CAP_UNIX) 156 capabilities |= CAP_UNIX; 157 158 return capabilities; 159} 160 161static void 162unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) 163{ 164 char *bcc_ptr = *pbcc_area; 165 int bytes_ret = 0; 166 167 /* Copy OS version */ 168 bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32, 169 nls_cp); 170 bcc_ptr += 2 * bytes_ret; 171 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, init_utsname()->release, 172 32, nls_cp); 173 bcc_ptr += 2 * bytes_ret; 174 bcc_ptr += 2; /* trailing null */ 175 176 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, 177 32, nls_cp); 178 bcc_ptr += 2 * bytes_ret; 179 bcc_ptr += 2; /* trailing null */ 180 181 *pbcc_area = bcc_ptr; 182} 183 184static void unicode_domain_string(char **pbcc_area, struct cifsSesInfo *ses, 185 const struct nls_table *nls_cp) 186{ 187 char *bcc_ptr = *pbcc_area; 188 int bytes_ret = 0; 189 190 /* copy domain */ 191 if (ses->domainName == NULL) { 192 /* Sending null domain better than using a bogus domain name (as 193 we did briefly in 2.6.18) since server will use its default */ 194 *bcc_ptr = 0; 195 *(bcc_ptr+1) = 0; 196 bytes_ret = 0; 197 } else 198 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName, 199 256, nls_cp); 200 bcc_ptr += 2 * bytes_ret; 201 bcc_ptr += 2; /* account for null terminator */ 202 203 *pbcc_area = bcc_ptr; 204} 205 206 207static void unicode_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses, 208 const struct nls_table *nls_cp) 209{ 210 char *bcc_ptr = *pbcc_area; 211 int bytes_ret = 0; 212 213 /* BB FIXME add check that strings total less 214 than 335 or will need to send them as arrays */ 215 216 /* unicode strings, must be word aligned before the call */ 217/* if ((long) bcc_ptr % 2) { 218 *bcc_ptr = 0; 219 bcc_ptr++; 220 } */ 221 /* copy user */ 222 if (ses->userName == NULL) { 223 /* null user mount */ 224 *bcc_ptr = 0; 225 *(bcc_ptr+1) = 0; 226 } else { 227 bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName, 228 MAX_USERNAME_SIZE, nls_cp); 229 } 230 bcc_ptr += 2 * bytes_ret; 231 bcc_ptr += 2; /* account for null termination */ 232 233 unicode_domain_string(&bcc_ptr, ses, nls_cp); 234 unicode_oslm_strings(&bcc_ptr, nls_cp); 235 236 *pbcc_area = bcc_ptr; 237} 238 239static void ascii_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses, 240 const struct nls_table *nls_cp) 241{ 242 char *bcc_ptr = *pbcc_area; 243 244 /* copy user */ 245 /* BB what about null user mounts - check that we do this BB */ 246 /* copy user */ 247 if (ses->userName == NULL) { 248 /* BB what about null user mounts - check that we do this BB */ 249 } else { 250 strncpy(bcc_ptr, ses->userName, MAX_USERNAME_SIZE); 251 } 252 bcc_ptr += strnlen(ses->userName, MAX_USERNAME_SIZE); 253 *bcc_ptr = 0; 254 bcc_ptr++; /* account for null termination */ 255 256 /* copy domain */ 257 258 if (ses->domainName != NULL) { 259 strncpy(bcc_ptr, ses->domainName, 256); 260 bcc_ptr += strnlen(ses->domainName, 256); 261 } /* else we will send a null domain name 262 so the server will default to its own domain */ 263 *bcc_ptr = 0; 264 bcc_ptr++; 265 266 /* BB check for overflow here */ 267 268 strcpy(bcc_ptr, "Linux version "); 269 bcc_ptr += strlen("Linux version "); 270 strcpy(bcc_ptr, init_utsname()->release); 271 bcc_ptr += strlen(init_utsname()->release) + 1; 272 273 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); 274 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; 275 276 *pbcc_area = bcc_ptr; 277} 278 279static void 280decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifsSesInfo *ses, 281 const struct nls_table *nls_cp) 282{ 283 int len; 284 char *data = *pbcc_area; 285 286 cFYI(1, "bleft %d", bleft); 287 288 /* 289 * Windows servers do not always double null terminate their final 290 * Unicode string. Check to see if there are an uneven number of bytes 291 * left. If so, then add an extra NULL pad byte to the end of the 292 * response. 293 * 294 * See section 2.7.2 in "Implementing CIFS" for details 295 */ 296 if (bleft % 2) { 297 data[bleft] = 0; 298 ++bleft; 299 } 300 301 kfree(ses->serverOS); 302 ses->serverOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp); 303 cFYI(1, "serverOS=%s", ses->serverOS); 304 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 305 data += len; 306 bleft -= len; 307 if (bleft <= 0) 308 return; 309 310 kfree(ses->serverNOS); 311 ses->serverNOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp); 312 cFYI(1, "serverNOS=%s", ses->serverNOS); 313 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 314 data += len; 315 bleft -= len; 316 if (bleft <= 0) 317 return; 318 319 kfree(ses->serverDomain); 320 ses->serverDomain = cifs_strndup_from_ucs(data, bleft, true, nls_cp); 321 cFYI(1, "serverDomain=%s", ses->serverDomain); 322 323 return; 324} 325 326static int decode_ascii_ssetup(char **pbcc_area, int bleft, 327 struct cifsSesInfo *ses, 328 const struct nls_table *nls_cp) 329{ 330 int rc = 0; 331 int len; 332 char *bcc_ptr = *pbcc_area; 333 334 cFYI(1, "decode sessetup ascii. bleft %d", bleft); 335 336 len = strnlen(bcc_ptr, bleft); 337 if (len >= bleft) 338 return rc; 339 340 kfree(ses->serverOS); 341 342 ses->serverOS = kzalloc(len + 1, GFP_KERNEL); 343 if (ses->serverOS) 344 strncpy(ses->serverOS, bcc_ptr, len); 345 if (strncmp(ses->serverOS, "OS/2", 4) == 0) { 346 cFYI(1, "OS/2 server"); 347 ses->flags |= CIFS_SES_OS2; 348 } 349 350 bcc_ptr += len + 1; 351 bleft -= len + 1; 352 353 len = strnlen(bcc_ptr, bleft); 354 if (len >= bleft) 355 return rc; 356 357 kfree(ses->serverNOS); 358 359 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL); 360 if (ses->serverNOS) 361 strncpy(ses->serverNOS, bcc_ptr, len); 362 363 bcc_ptr += len + 1; 364 bleft -= len + 1; 365 366 len = strnlen(bcc_ptr, bleft); 367 if (len > bleft) 368 return rc; 369 370 /* No domain field in LANMAN case. Domain is 371 returned by old servers in the SMB negprot response */ 372 /* BB For newer servers which do not support Unicode, 373 but thus do return domain here we could add parsing 374 for it later, but it is not very important */ 375 cFYI(1, "ascii: bytes left %d", bleft); 376 377 return rc; 378} 379 380static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, 381 struct cifsSesInfo *ses) 382{ 383 unsigned int tioffset; /* challenge message target info area */ 384 unsigned int tilen; /* challenge message target info area length */ 385 386 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; 387 388 if (blob_len < sizeof(CHALLENGE_MESSAGE)) { 389 cERROR(1, "challenge blob len %d too small", blob_len); 390 return -EINVAL; 391 } 392 393 if (memcmp(pblob->Signature, "NTLMSSP", 8)) { 394 cERROR(1, "blob signature incorrect %s", pblob->Signature); 395 return -EINVAL; 396 } 397 if (pblob->MessageType != NtLmChallenge) { 398 cERROR(1, "Incorrect message type %d", pblob->MessageType); 399 return -EINVAL; 400 } 401 402 memcpy(ses->cryptKey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); 403 /* BB we could decode pblob->NegotiateFlags; some may be useful */ 404 /* In particular we can examine sign flags */ 405 /* BB spec says that if AvId field of MsvAvTimestamp is populated then 406 we must set the MIC field of the AUTHENTICATE_MESSAGE */ 407 408 tioffset = cpu_to_le16(pblob->TargetInfoArray.BufferOffset); 409 tilen = cpu_to_le16(pblob->TargetInfoArray.Length); 410 ses->tilen = tilen; 411 if (ses->tilen) { 412 ses->tiblob = kmalloc(tilen, GFP_KERNEL); 413 if (!ses->tiblob) { 414 cERROR(1, "Challenge target info allocation failure"); 415 ses->tilen = 0; 416 return -ENOMEM; 417 } 418 memcpy(ses->tiblob, bcc_ptr + tioffset, ses->tilen); 419 } 420 421 return 0; 422} 423 424#ifdef CONFIG_CIFS_EXPERIMENTAL 425/* BB Move to ntlmssp.c eventually */ 426 427/* We do not malloc the blob, it is passed in pbuffer, because 428 it is fixed size, and small, making this approach cleaner */ 429static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer, 430 struct cifsSesInfo *ses) 431{ 432 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer; 433 __u32 flags; 434 435 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 436 sec_blob->MessageType = NtLmNegotiate; 437 438 /* BB is NTLMV2 session security format easier to use here? */ 439 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 440 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 441 NTLMSSP_NEGOTIATE_NTLM; 442 if (ses->server->secMode & 443 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) 444 flags |= NTLMSSP_NEGOTIATE_SIGN; 445 if (ses->server->secMode & SECMODE_SIGN_REQUIRED) 446 flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; 447 448 sec_blob->NegotiateFlags |= cpu_to_le32(flags); 449 450 sec_blob->WorkstationName.BufferOffset = 0; 451 sec_blob->WorkstationName.Length = 0; 452 sec_blob->WorkstationName.MaximumLength = 0; 453 454 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */ 455 sec_blob->DomainName.BufferOffset = 0; 456 sec_blob->DomainName.Length = 0; 457 sec_blob->DomainName.MaximumLength = 0; 458} 459 460/* We do not malloc the blob, it is passed in pbuffer, because its 461 maximum possible size is fixed and small, making this approach cleaner. 462 This function returns the length of the data in the blob */ 463static int build_ntlmssp_auth_blob(unsigned char *pbuffer, 464 u16 *buflen, 465 struct cifsSesInfo *ses, 466 const struct nls_table *nls_cp) 467{ 468 int rc; 469 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer; 470 __u32 flags; 471 unsigned char *tmp; 472 473 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 474 sec_blob->MessageType = NtLmAuthenticate; 475 476 flags = NTLMSSP_NEGOTIATE_56 | 477 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO | 478 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 479 NTLMSSP_NEGOTIATE_NTLM; 480 if (ses->server->secMode & 481 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) 482 flags |= NTLMSSP_NEGOTIATE_SIGN; 483 if (ses->server->secMode & SECMODE_SIGN_REQUIRED) 484 flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; 485 486 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE); 487 sec_blob->NegotiateFlags |= cpu_to_le32(flags); 488 489 sec_blob->LmChallengeResponse.BufferOffset = 490 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); 491 sec_blob->LmChallengeResponse.Length = 0; 492 sec_blob->LmChallengeResponse.MaximumLength = 0; 493 494 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer); 495 rc = setup_ntlmv2_rsp(ses, nls_cp); 496 if (rc) { 497 cERROR(1, "Error %d during NTLMSSP authentication", rc); 498 goto setup_ntlmv2_ret; 499 } 500 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 501 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 502 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 503 504 sec_blob->NtChallengeResponse.Length = 505 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 506 sec_blob->NtChallengeResponse.MaximumLength = 507 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 508 509 if (ses->domainName == NULL) { 510 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); 511 sec_blob->DomainName.Length = 0; 512 sec_blob->DomainName.MaximumLength = 0; 513 tmp += 2; 514 } else { 515 int len; 516 len = cifs_strtoUCS((__le16 *)tmp, ses->domainName, 517 MAX_USERNAME_SIZE, nls_cp); 518 len *= 2; /* unicode is 2 bytes each */ 519 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); 520 sec_blob->DomainName.Length = cpu_to_le16(len); 521 sec_blob->DomainName.MaximumLength = cpu_to_le16(len); 522 tmp += len; 523 } 524 525 if (ses->userName == NULL) { 526 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); 527 sec_blob->UserName.Length = 0; 528 sec_blob->UserName.MaximumLength = 0; 529 tmp += 2; 530 } else { 531 int len; 532 len = cifs_strtoUCS((__le16 *)tmp, ses->userName, 533 MAX_USERNAME_SIZE, nls_cp); 534 len *= 2; /* unicode is 2 bytes each */ 535 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); 536 sec_blob->UserName.Length = cpu_to_le16(len); 537 sec_blob->UserName.MaximumLength = cpu_to_le16(len); 538 tmp += len; 539 } 540 541 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer); 542 sec_blob->WorkstationName.Length = 0; 543 sec_blob->WorkstationName.MaximumLength = 0; 544 tmp += 2; 545 546 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); 547 sec_blob->SessionKey.Length = 0; 548 sec_blob->SessionKey.MaximumLength = 0; 549 550setup_ntlmv2_ret: 551 *buflen = tmp - pbuffer; 552 return rc; 553} 554 555 556static void setup_ntlmssp_neg_req(SESSION_SETUP_ANDX *pSMB, 557 struct cifsSesInfo *ses) 558{ 559 build_ntlmssp_negotiate_blob(&pSMB->req.SecurityBlob[0], ses); 560 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE)); 561 562 return; 563} 564#endif 565 566int 567CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, 568 const struct nls_table *nls_cp) 569{ 570 int rc = 0; 571 int wct; 572 struct smb_hdr *smb_buf; 573 char *bcc_ptr; 574 char *str_area; 575 SESSION_SETUP_ANDX *pSMB; 576 __u32 capabilities; 577 int count; 578 int resp_buf_type; 579 struct kvec iov[3]; 580 enum securityEnum type; 581 __u16 action; 582 int bytes_remaining; 583 struct key *spnego_key = NULL; 584 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */ 585 u16 blob_len; 586 char *ntlmsspblob = NULL; 587 588 if (ses == NULL) 589 return -EINVAL; 590 591 type = ses->server->secType; 592 593 cFYI(1, "sess setup type %d", type); 594ssetup_ntlmssp_authenticate: 595 if (phase == NtLmChallenge) 596 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */ 597 598 if (type == LANMAN) { 599#ifndef CONFIG_CIFS_WEAK_PW_HASH 600 /* LANMAN and plaintext are less secure and off by default. 601 So we make this explicitly be turned on in kconfig (in the 602 build) and turned on at runtime (changed from the default) 603 in proc/fs/cifs or via mount parm. Unfortunately this is 604 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */ 605 return -EOPNOTSUPP; 606#endif 607 wct = 10; /* lanman 2 style sessionsetup */ 608 } else if ((type == NTLM) || (type == NTLMv2)) { 609 /* For NTLMv2 failures eventually may need to retry NTLM */ 610 wct = 13; /* old style NTLM sessionsetup */ 611 } else /* same size: negotiate or auth, NTLMSSP or extended security */ 612 wct = 12; 613 614 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, 615 (void **)&smb_buf); 616 if (rc) 617 return rc; 618 619 pSMB = (SESSION_SETUP_ANDX *)smb_buf; 620 621 capabilities = cifs_ssetup_hdr(ses, pSMB); 622 623 /* we will send the SMB in three pieces: 624 a fixed length beginning part, an optional 625 SPNEGO blob (which can be zero length), and a 626 last part which will include the strings 627 and rest of bcc area. This allows us to avoid 628 a large buffer 17K allocation */ 629 iov[0].iov_base = (char *)pSMB; 630 iov[0].iov_len = smb_buf->smb_buf_length + 4; 631 632 /* setting this here allows the code at the end of the function 633 to free the request buffer if there's an error */ 634 resp_buf_type = CIFS_SMALL_BUFFER; 635 636 /* 2000 big enough to fit max user, domain, NOS name etc. */ 637 str_area = kmalloc(2000, GFP_KERNEL); 638 if (str_area == NULL) { 639 rc = -ENOMEM; 640 goto ssetup_exit; 641 } 642 bcc_ptr = str_area; 643 644 ses->flags &= ~CIFS_SES_LANMAN; 645 646 iov[1].iov_base = NULL; 647 iov[1].iov_len = 0; 648 649 if (type == LANMAN) { 650#ifdef CONFIG_CIFS_WEAK_PW_HASH 651 char lnm_session_key[CIFS_SESS_KEY_SIZE]; 652 653 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE; 654 655 /* no capabilities flags in old lanman negotiation */ 656 657 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE); 658 /* BB calculate hash with password */ 659 /* and copy into bcc */ 660 661 calc_lanman_hash(ses->password, ses->cryptKey, 662 ses->server->secMode & SECMODE_PW_ENCRYPT ? 663 true : false, lnm_session_key); 664 665 ses->flags |= CIFS_SES_LANMAN; 666 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE); 667 bcc_ptr += CIFS_SESS_KEY_SIZE; 668 669 /* can not sign if LANMAN negotiated so no need 670 to calculate signing key? but what if server 671 changed to do higher than lanman dialect and 672 we reconnected would we ever calc signing_key? */ 673 674 cFYI(1, "Negotiating LANMAN setting up strings"); 675 /* Unicode not allowed for LANMAN dialects */ 676 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); 677#endif 678 } else if (type == NTLM) { 679 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 680 pSMB->req_no_secext.CaseInsensitivePasswordLength = 681 cpu_to_le16(CIFS_AUTH_RESP_SIZE); 682 pSMB->req_no_secext.CaseSensitivePasswordLength = 683 cpu_to_le16(CIFS_AUTH_RESP_SIZE); 684 685 /* calculate ntlm response and session key */ 686 rc = setup_ntlm_response(ses); 687 if (rc) { 688 cERROR(1, "Error %d during NTLM authentication", rc); 689 goto ssetup_exit; 690 } 691 692 /* copy ntlm response */ 693 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 694 CIFS_AUTH_RESP_SIZE); 695 bcc_ptr += CIFS_AUTH_RESP_SIZE; 696 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 697 CIFS_AUTH_RESP_SIZE); 698 bcc_ptr += CIFS_AUTH_RESP_SIZE; 699 700 if (ses->capabilities & CAP_UNICODE) { 701 /* unicode strings must be word aligned */ 702 if (iov[0].iov_len % 2) { 703 *bcc_ptr = 0; 704 bcc_ptr++; 705 } 706 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); 707 } else 708 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); 709 } else if (type == NTLMv2) { 710 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 711 712 /* LM2 password would be here if we supported it */ 713 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; 714 715 /* calculate nlmv2 response and session key */ 716 rc = setup_ntlmv2_rsp(ses, nls_cp); 717 if (rc) { 718 cERROR(1, "Error %d during NTLMv2 authentication", rc); 719 goto ssetup_exit; 720 } 721 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 722 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 723 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 724 725 /* set case sensitive password length after tilen may get 726 * assigned, tilen is 0 otherwise. 727 */ 728 pSMB->req_no_secext.CaseSensitivePasswordLength = 729 cpu_to_le16(ses->auth_key.len); 730 731 if (ses->capabilities & CAP_UNICODE) { 732 if (iov[0].iov_len % 2) { 733 *bcc_ptr = 0; 734 bcc_ptr++; 735 } 736 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); 737 } else 738 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); 739 } else if (type == Kerberos) { 740#ifdef CONFIG_CIFS_UPCALL 741 struct cifs_spnego_msg *msg; 742 743 spnego_key = cifs_get_spnego_key(ses); 744 if (IS_ERR(spnego_key)) { 745 rc = PTR_ERR(spnego_key); 746 spnego_key = NULL; 747 goto ssetup_exit; 748 } 749 750 msg = spnego_key->payload.data; 751 /* check version field to make sure that cifs.upcall is 752 sending us a response in an expected form */ 753 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 754 cERROR(1, "incorrect version of cifs.upcall (expected" 755 " %d but got %d)", 756 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 757 rc = -EKEYREJECTED; 758 goto ssetup_exit; 759 } 760 761 ses->auth_key.response = kmalloc(msg->sesskey_len, GFP_KERNEL); 762 if (!ses->auth_key.response) { 763 cERROR(1, "Kerberos can't allocate (%u bytes) memory", 764 msg->sesskey_len); 765 rc = -ENOMEM; 766 goto ssetup_exit; 767 } 768 memcpy(ses->auth_key.response, msg->data, msg->sesskey_len); 769 ses->auth_key.len = msg->sesskey_len; 770 771 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 772 capabilities |= CAP_EXTENDED_SECURITY; 773 pSMB->req.Capabilities = cpu_to_le32(capabilities); 774 iov[1].iov_base = msg->data + msg->sesskey_len; 775 iov[1].iov_len = msg->secblob_len; 776 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len); 777 778 if (ses->capabilities & CAP_UNICODE) { 779 /* unicode strings must be word aligned */ 780 if ((iov[0].iov_len + iov[1].iov_len) % 2) { 781 *bcc_ptr = 0; 782 bcc_ptr++; 783 } 784 unicode_oslm_strings(&bcc_ptr, nls_cp); 785 unicode_domain_string(&bcc_ptr, ses, nls_cp); 786 } else 787 /* BB: is this right? */ 788 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); 789#else /* ! CONFIG_CIFS_UPCALL */ 790 cERROR(1, "Kerberos negotiated but upcall support disabled!"); 791 rc = -ENOSYS; 792 goto ssetup_exit; 793#endif /* CONFIG_CIFS_UPCALL */ 794 } else { 795#ifdef CONFIG_CIFS_EXPERIMENTAL 796 if (type == RawNTLMSSP) { 797 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { 798 cERROR(1, "NTLMSSP requires Unicode support"); 799 rc = -ENOSYS; 800 goto ssetup_exit; 801 } 802 803 cFYI(1, "ntlmssp session setup phase %d", phase); 804 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 805 capabilities |= CAP_EXTENDED_SECURITY; 806 pSMB->req.Capabilities |= cpu_to_le32(capabilities); 807 if (phase == NtLmNegotiate) { 808 setup_ntlmssp_neg_req(pSMB, ses); 809 iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE); 810 iov[1].iov_base = &pSMB->req.SecurityBlob[0]; 811 } else if (phase == NtLmAuthenticate) { 812 /* 5 is an empirical value, large enought to 813 * hold authenticate message, max 10 of 814 * av paris, doamin,user,workstation mames, 815 * flags etc.. 816 */ 817 ntlmsspblob = kmalloc( 818 5*sizeof(struct _AUTHENTICATE_MESSAGE), 819 GFP_KERNEL); 820 if (!ntlmsspblob) { 821 cERROR(1, "Can't allocate NTLMSSP"); 822 rc = -ENOMEM; 823 goto ssetup_exit; 824 } 825 826 rc = build_ntlmssp_auth_blob(ntlmsspblob, 827 &blob_len, ses, nls_cp); 828 if (rc) 829 goto ssetup_exit; 830 iov[1].iov_len = blob_len; 831 iov[1].iov_base = ntlmsspblob; 832 pSMB->req.SecurityBlobLength = 833 cpu_to_le16(blob_len); 834 /* Make sure that we tell the server that we 835 are using the uid that it just gave us back 836 on the response (challenge) */ 837 smb_buf->Uid = ses->Suid; 838 } else { 839 cERROR(1, "invalid phase %d", phase); 840 rc = -ENOSYS; 841 goto ssetup_exit; 842 } 843 /* unicode strings must be word aligned */ 844 if ((iov[0].iov_len + iov[1].iov_len) % 2) { 845 *bcc_ptr = 0; 846 bcc_ptr++; 847 } 848 unicode_oslm_strings(&bcc_ptr, nls_cp); 849 } else { 850 cERROR(1, "secType %d not supported!", type); 851 rc = -ENOSYS; 852 goto ssetup_exit; 853 } 854#else 855 cERROR(1, "secType %d not supported!", type); 856 rc = -ENOSYS; 857 goto ssetup_exit; 858#endif 859 } 860 861 iov[2].iov_base = str_area; 862 iov[2].iov_len = (long) bcc_ptr - (long) str_area; 863 864 count = iov[1].iov_len + iov[2].iov_len; 865 smb_buf->smb_buf_length += count; 866 867 BCC_LE(smb_buf) = cpu_to_le16(count); 868 869 rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type, 870 CIFS_STD_OP /* not long */ | CIFS_LOG_ERROR); 871 /* SMB request buf freed in SendReceive2 */ 872 873 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base; 874 smb_buf = (struct smb_hdr *)iov[0].iov_base; 875 876 if ((type == RawNTLMSSP) && (smb_buf->Status.CifsError == 877 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) { 878 if (phase != NtLmNegotiate) { 879 cERROR(1, "Unexpected more processing error"); 880 goto ssetup_exit; 881 } 882 /* NTLMSSP Negotiate sent now processing challenge (response) */ 883 phase = NtLmChallenge; /* process ntlmssp challenge */ 884 rc = 0; /* MORE_PROC rc is not an error here, but expected */ 885 } 886 if (rc) 887 goto ssetup_exit; 888 889 if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) { 890 rc = -EIO; 891 cERROR(1, "bad word count %d", smb_buf->WordCount); 892 goto ssetup_exit; 893 } 894 action = le16_to_cpu(pSMB->resp.Action); 895 if (action & GUEST_LOGIN) 896 cFYI(1, "Guest login"); /* BB mark SesInfo struct? */ 897 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 898 cFYI(1, "UID = %d ", ses->Suid); 899 /* response can have either 3 or 4 word count - Samba sends 3 */ 900 /* and lanman response is 3 */ 901 bytes_remaining = BCC(smb_buf); 902 bcc_ptr = pByteArea(smb_buf); 903 904 if (smb_buf->WordCount == 4) { 905 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 906 if (blob_len > bytes_remaining) { 907 cERROR(1, "bad security blob length %d", blob_len); 908 rc = -EINVAL; 909 goto ssetup_exit; 910 } 911 if (phase == NtLmChallenge) { 912 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); 913 /* now goto beginning for ntlmssp authenticate phase */ 914 if (rc) 915 goto ssetup_exit; 916 } 917 bcc_ptr += blob_len; 918 bytes_remaining -= blob_len; 919 } 920 921 /* BB check if Unicode and decode strings */ 922 if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 923 /* unicode string area must be word-aligned */ 924 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { 925 ++bcc_ptr; 926 --bytes_remaining; 927 } 928 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp); 929 } else { 930 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining, 931 ses, nls_cp); 932 } 933 934ssetup_exit: 935 if (spnego_key) { 936 key_revoke(spnego_key); 937 key_put(spnego_key); 938 } 939 kfree(str_area); 940 kfree(ntlmsspblob); 941 ntlmsspblob = NULL; 942 if (resp_buf_type == CIFS_SMALL_BUFFER) { 943 cFYI(1, "ssetup freeing small buf %p", iov[0].iov_base); 944 cifs_small_buf_release(iov[0].iov_base); 945 } else if (resp_buf_type == CIFS_LARGE_BUFFER) 946 cifs_buf_release(iov[0].iov_base); 947 948 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */ 949 if ((phase == NtLmChallenge) && (rc == 0)) 950 goto ssetup_ntlmssp_authenticate; 951 952 return rc; 953} 954