sess.c revision 43988d76851077d2945080665e3c4e2e636d700a
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->user_name == 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->user_name, 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->user_name != NULL) 248 strncpy(bcc_ptr, ses->user_name, MAX_USERNAME_SIZE); 249 /* else null user mount */ 250 251 bcc_ptr += strnlen(ses->user_name, MAX_USERNAME_SIZE); 252 *bcc_ptr = 0; 253 bcc_ptr++; /* account for null termination */ 254 255 /* copy domain */ 256 257 if (ses->domainName != NULL) { 258 strncpy(bcc_ptr, ses->domainName, 256); 259 bcc_ptr += strnlen(ses->domainName, 256); 260 } /* else we will send a null domain name 261 so the server will default to its own domain */ 262 *bcc_ptr = 0; 263 bcc_ptr++; 264 265 /* BB check for overflow here */ 266 267 strcpy(bcc_ptr, "Linux version "); 268 bcc_ptr += strlen("Linux version "); 269 strcpy(bcc_ptr, init_utsname()->release); 270 bcc_ptr += strlen(init_utsname()->release) + 1; 271 272 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); 273 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; 274 275 *pbcc_area = bcc_ptr; 276} 277 278static void 279decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifsSesInfo *ses, 280 const struct nls_table *nls_cp) 281{ 282 int len; 283 char *data = *pbcc_area; 284 285 cFYI(1, "bleft %d", bleft); 286 287 kfree(ses->serverOS); 288 ses->serverOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp); 289 cFYI(1, "serverOS=%s", ses->serverOS); 290 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 291 data += len; 292 bleft -= len; 293 if (bleft <= 0) 294 return; 295 296 kfree(ses->serverNOS); 297 ses->serverNOS = cifs_strndup_from_ucs(data, bleft, true, nls_cp); 298 cFYI(1, "serverNOS=%s", ses->serverNOS); 299 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 300 data += len; 301 bleft -= len; 302 if (bleft <= 0) 303 return; 304 305 kfree(ses->serverDomain); 306 ses->serverDomain = cifs_strndup_from_ucs(data, bleft, true, nls_cp); 307 cFYI(1, "serverDomain=%s", ses->serverDomain); 308 309 return; 310} 311 312static int decode_ascii_ssetup(char **pbcc_area, __u16 bleft, 313 struct cifsSesInfo *ses, 314 const struct nls_table *nls_cp) 315{ 316 int rc = 0; 317 int len; 318 char *bcc_ptr = *pbcc_area; 319 320 cFYI(1, "decode sessetup ascii. bleft %d", bleft); 321 322 len = strnlen(bcc_ptr, bleft); 323 if (len >= bleft) 324 return rc; 325 326 kfree(ses->serverOS); 327 328 ses->serverOS = kzalloc(len + 1, GFP_KERNEL); 329 if (ses->serverOS) 330 strncpy(ses->serverOS, bcc_ptr, len); 331 if (strncmp(ses->serverOS, "OS/2", 4) == 0) { 332 cFYI(1, "OS/2 server"); 333 ses->flags |= CIFS_SES_OS2; 334 } 335 336 bcc_ptr += len + 1; 337 bleft -= len + 1; 338 339 len = strnlen(bcc_ptr, bleft); 340 if (len >= bleft) 341 return rc; 342 343 kfree(ses->serverNOS); 344 345 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL); 346 if (ses->serverNOS) 347 strncpy(ses->serverNOS, bcc_ptr, len); 348 349 bcc_ptr += len + 1; 350 bleft -= len + 1; 351 352 len = strnlen(bcc_ptr, bleft); 353 if (len > bleft) 354 return rc; 355 356 /* No domain field in LANMAN case. Domain is 357 returned by old servers in the SMB negprot response */ 358 /* BB For newer servers which do not support Unicode, 359 but thus do return domain here we could add parsing 360 for it later, but it is not very important */ 361 cFYI(1, "ascii: bytes left %d", bleft); 362 363 return rc; 364} 365 366static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, 367 struct cifsSesInfo *ses) 368{ 369 unsigned int tioffset; /* challenge message target info area */ 370 unsigned int tilen; /* challenge message target info area length */ 371 372 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; 373 374 if (blob_len < sizeof(CHALLENGE_MESSAGE)) { 375 cERROR(1, "challenge blob len %d too small", blob_len); 376 return -EINVAL; 377 } 378 379 if (memcmp(pblob->Signature, "NTLMSSP", 8)) { 380 cERROR(1, "blob signature incorrect %s", pblob->Signature); 381 return -EINVAL; 382 } 383 if (pblob->MessageType != NtLmChallenge) { 384 cERROR(1, "Incorrect message type %d", pblob->MessageType); 385 return -EINVAL; 386 } 387 388 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); 389 /* BB we could decode pblob->NegotiateFlags; some may be useful */ 390 /* In particular we can examine sign flags */ 391 /* BB spec says that if AvId field of MsvAvTimestamp is populated then 392 we must set the MIC field of the AUTHENTICATE_MESSAGE */ 393 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags); 394 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset); 395 tilen = le16_to_cpu(pblob->TargetInfoArray.Length); 396 if (tilen) { 397 ses->auth_key.response = kmalloc(tilen, GFP_KERNEL); 398 if (!ses->auth_key.response) { 399 cERROR(1, "Challenge target info allocation failure"); 400 return -ENOMEM; 401 } 402 memcpy(ses->auth_key.response, bcc_ptr + tioffset, tilen); 403 ses->auth_key.len = tilen; 404 } 405 406 return 0; 407} 408 409/* BB Move to ntlmssp.c eventually */ 410 411/* We do not malloc the blob, it is passed in pbuffer, because 412 it is fixed size, and small, making this approach cleaner */ 413static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer, 414 struct cifsSesInfo *ses) 415{ 416 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer; 417 __u32 flags; 418 419 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE)); 420 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 421 sec_blob->MessageType = NtLmNegotiate; 422 423 /* BB is NTLMV2 session security format easier to use here? */ 424 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 425 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 426 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; 427 if (ses->server->secMode & 428 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { 429 flags |= NTLMSSP_NEGOTIATE_SIGN; 430 if (!ses->server->session_estab) 431 flags |= NTLMSSP_NEGOTIATE_KEY_XCH | 432 NTLMSSP_NEGOTIATE_EXTENDED_SEC; 433 } 434 435 sec_blob->NegotiateFlags = cpu_to_le32(flags); 436 437 sec_blob->WorkstationName.BufferOffset = 0; 438 sec_blob->WorkstationName.Length = 0; 439 sec_blob->WorkstationName.MaximumLength = 0; 440 441 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */ 442 sec_blob->DomainName.BufferOffset = 0; 443 sec_blob->DomainName.Length = 0; 444 sec_blob->DomainName.MaximumLength = 0; 445} 446 447/* We do not malloc the blob, it is passed in pbuffer, because its 448 maximum possible size is fixed and small, making this approach cleaner. 449 This function returns the length of the data in the blob */ 450static int build_ntlmssp_auth_blob(unsigned char *pbuffer, 451 u16 *buflen, 452 struct cifsSesInfo *ses, 453 const struct nls_table *nls_cp) 454{ 455 int rc; 456 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer; 457 __u32 flags; 458 unsigned char *tmp; 459 460 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 461 sec_blob->MessageType = NtLmAuthenticate; 462 463 flags = NTLMSSP_NEGOTIATE_56 | 464 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO | 465 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 466 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; 467 if (ses->server->secMode & 468 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) 469 flags |= NTLMSSP_NEGOTIATE_SIGN; 470 if (ses->server->secMode & SECMODE_SIGN_REQUIRED) 471 flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN; 472 473 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE); 474 sec_blob->NegotiateFlags = cpu_to_le32(flags); 475 476 sec_blob->LmChallengeResponse.BufferOffset = 477 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); 478 sec_blob->LmChallengeResponse.Length = 0; 479 sec_blob->LmChallengeResponse.MaximumLength = 0; 480 481 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer); 482 rc = setup_ntlmv2_rsp(ses, nls_cp); 483 if (rc) { 484 cERROR(1, "Error %d during NTLMSSP authentication", rc); 485 goto setup_ntlmv2_ret; 486 } 487 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 488 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 489 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 490 491 sec_blob->NtChallengeResponse.Length = 492 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 493 sec_blob->NtChallengeResponse.MaximumLength = 494 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 495 496 if (ses->domainName == NULL) { 497 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); 498 sec_blob->DomainName.Length = 0; 499 sec_blob->DomainName.MaximumLength = 0; 500 tmp += 2; 501 } else { 502 int len; 503 len = cifs_strtoUCS((__le16 *)tmp, ses->domainName, 504 MAX_USERNAME_SIZE, nls_cp); 505 len *= 2; /* unicode is 2 bytes each */ 506 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); 507 sec_blob->DomainName.Length = cpu_to_le16(len); 508 sec_blob->DomainName.MaximumLength = cpu_to_le16(len); 509 tmp += len; 510 } 511 512 if (ses->user_name == NULL) { 513 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); 514 sec_blob->UserName.Length = 0; 515 sec_blob->UserName.MaximumLength = 0; 516 tmp += 2; 517 } else { 518 int len; 519 len = cifs_strtoUCS((__le16 *)tmp, ses->user_name, 520 MAX_USERNAME_SIZE, nls_cp); 521 len *= 2; /* unicode is 2 bytes each */ 522 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); 523 sec_blob->UserName.Length = cpu_to_le16(len); 524 sec_blob->UserName.MaximumLength = cpu_to_le16(len); 525 tmp += len; 526 } 527 528 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer); 529 sec_blob->WorkstationName.Length = 0; 530 sec_blob->WorkstationName.MaximumLength = 0; 531 tmp += 2; 532 533 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) || 534 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) 535 && !calc_seckey(ses)) { 536 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); 537 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); 538 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE); 539 sec_blob->SessionKey.MaximumLength = 540 cpu_to_le16(CIFS_CPHTXT_SIZE); 541 tmp += CIFS_CPHTXT_SIZE; 542 } else { 543 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); 544 sec_blob->SessionKey.Length = 0; 545 sec_blob->SessionKey.MaximumLength = 0; 546 } 547 548setup_ntlmv2_ret: 549 *buflen = tmp - pbuffer; 550 return rc; 551} 552 553int 554CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, 555 const struct nls_table *nls_cp) 556{ 557 int rc = 0; 558 int wct; 559 struct smb_hdr *smb_buf; 560 char *bcc_ptr; 561 char *str_area; 562 SESSION_SETUP_ANDX *pSMB; 563 __u32 capabilities; 564 __u16 count; 565 int resp_buf_type; 566 struct kvec iov[3]; 567 enum securityEnum type; 568 __u16 action, bytes_remaining; 569 struct key *spnego_key = NULL; 570 __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */ 571 u16 blob_len; 572 char *ntlmsspblob = NULL; 573 574 if (ses == NULL) 575 return -EINVAL; 576 577 type = ses->server->secType; 578 cFYI(1, "sess setup type %d", type); 579 if (type == RawNTLMSSP) { 580 /* if memory allocation is successful, caller of this function 581 * frees it. 582 */ 583 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); 584 if (!ses->ntlmssp) 585 return -ENOMEM; 586 } 587 588ssetup_ntlmssp_authenticate: 589 if (phase == NtLmChallenge) 590 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */ 591 592 if (type == LANMAN) { 593#ifndef CONFIG_CIFS_WEAK_PW_HASH 594 /* LANMAN and plaintext are less secure and off by default. 595 So we make this explicitly be turned on in kconfig (in the 596 build) and turned on at runtime (changed from the default) 597 in proc/fs/cifs or via mount parm. Unfortunately this is 598 needed for old Win (e.g. Win95), some obscure NAS and OS/2 */ 599 return -EOPNOTSUPP; 600#endif 601 wct = 10; /* lanman 2 style sessionsetup */ 602 } else if ((type == NTLM) || (type == NTLMv2)) { 603 /* For NTLMv2 failures eventually may need to retry NTLM */ 604 wct = 13; /* old style NTLM sessionsetup */ 605 } else /* same size: negotiate or auth, NTLMSSP or extended security */ 606 wct = 12; 607 608 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, 609 (void **)&smb_buf); 610 if (rc) 611 return rc; 612 613 pSMB = (SESSION_SETUP_ANDX *)smb_buf; 614 615 capabilities = cifs_ssetup_hdr(ses, pSMB); 616 617 /* we will send the SMB in three pieces: 618 a fixed length beginning part, an optional 619 SPNEGO blob (which can be zero length), and a 620 last part which will include the strings 621 and rest of bcc area. This allows us to avoid 622 a large buffer 17K allocation */ 623 iov[0].iov_base = (char *)pSMB; 624 iov[0].iov_len = smb_buf->smb_buf_length + 4; 625 626 /* setting this here allows the code at the end of the function 627 to free the request buffer if there's an error */ 628 resp_buf_type = CIFS_SMALL_BUFFER; 629 630 /* 2000 big enough to fit max user, domain, NOS name etc. */ 631 str_area = kmalloc(2000, GFP_KERNEL); 632 if (str_area == NULL) { 633 rc = -ENOMEM; 634 goto ssetup_exit; 635 } 636 bcc_ptr = str_area; 637 638 ses->flags &= ~CIFS_SES_LANMAN; 639 640 iov[1].iov_base = NULL; 641 iov[1].iov_len = 0; 642 643 if (type == LANMAN) { 644#ifdef CONFIG_CIFS_WEAK_PW_HASH 645 char lnm_session_key[CIFS_AUTH_RESP_SIZE]; 646 647 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE; 648 649 /* no capabilities flags in old lanman negotiation */ 650 651 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE); 652 653 /* Calculate hash with password and copy into bcc_ptr. 654 * Encryption Key (stored as in cryptkey) gets used if the 655 * security mode bit in Negottiate Protocol response states 656 * to use challenge/response method (i.e. Password bit is 1). 657 */ 658 659 rc = calc_lanman_hash(ses->password, ses->server->cryptkey, 660 ses->server->secMode & SECMODE_PW_ENCRYPT ? 661 true : false, lnm_session_key); 662 663 ses->flags |= CIFS_SES_LANMAN; 664 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE); 665 bcc_ptr += CIFS_AUTH_RESP_SIZE; 666 667 /* can not sign if LANMAN negotiated so no need 668 to calculate signing key? but what if server 669 changed to do higher than lanman dialect and 670 we reconnected would we ever calc signing_key? */ 671 672 cFYI(1, "Negotiating LANMAN setting up strings"); 673 /* Unicode not allowed for LANMAN dialects */ 674 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); 675#endif 676 } else if (type == NTLM) { 677 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 678 pSMB->req_no_secext.CaseInsensitivePasswordLength = 679 cpu_to_le16(CIFS_AUTH_RESP_SIZE); 680 pSMB->req_no_secext.CaseSensitivePasswordLength = 681 cpu_to_le16(CIFS_AUTH_RESP_SIZE); 682 683 /* calculate ntlm response and session key */ 684 rc = setup_ntlm_response(ses); 685 if (rc) { 686 cERROR(1, "Error %d during NTLM authentication", rc); 687 goto ssetup_exit; 688 } 689 690 /* copy ntlm response */ 691 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 692 CIFS_AUTH_RESP_SIZE); 693 bcc_ptr += CIFS_AUTH_RESP_SIZE; 694 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 695 CIFS_AUTH_RESP_SIZE); 696 bcc_ptr += CIFS_AUTH_RESP_SIZE; 697 698 if (ses->capabilities & CAP_UNICODE) { 699 /* unicode strings must be word aligned */ 700 if (iov[0].iov_len % 2) { 701 *bcc_ptr = 0; 702 bcc_ptr++; 703 } 704 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); 705 } else 706 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); 707 } else if (type == NTLMv2) { 708 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 709 710 /* LM2 password would be here if we supported it */ 711 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; 712 713 /* calculate nlmv2 response and session key */ 714 rc = setup_ntlmv2_rsp(ses, nls_cp); 715 if (rc) { 716 cERROR(1, "Error %d during NTLMv2 authentication", rc); 717 goto ssetup_exit; 718 } 719 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 720 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 721 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 722 723 /* set case sensitive password length after tilen may get 724 * assigned, tilen is 0 otherwise. 725 */ 726 pSMB->req_no_secext.CaseSensitivePasswordLength = 727 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 728 729 if (ses->capabilities & CAP_UNICODE) { 730 if (iov[0].iov_len % 2) { 731 *bcc_ptr = 0; 732 bcc_ptr++; 733 } 734 unicode_ssetup_strings(&bcc_ptr, ses, nls_cp); 735 } else 736 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); 737 } else if (type == Kerberos) { 738#ifdef CONFIG_CIFS_UPCALL 739 struct cifs_spnego_msg *msg; 740 741 spnego_key = cifs_get_spnego_key(ses); 742 if (IS_ERR(spnego_key)) { 743 rc = PTR_ERR(spnego_key); 744 spnego_key = NULL; 745 goto ssetup_exit; 746 } 747 748 msg = spnego_key->payload.data; 749 /* check version field to make sure that cifs.upcall is 750 sending us a response in an expected form */ 751 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 752 cERROR(1, "incorrect version of cifs.upcall (expected" 753 " %d but got %d)", 754 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 755 rc = -EKEYREJECTED; 756 goto ssetup_exit; 757 } 758 759 ses->auth_key.response = kmalloc(msg->sesskey_len, GFP_KERNEL); 760 if (!ses->auth_key.response) { 761 cERROR(1, "Kerberos can't allocate (%u bytes) memory", 762 msg->sesskey_len); 763 rc = -ENOMEM; 764 goto ssetup_exit; 765 } 766 memcpy(ses->auth_key.response, msg->data, msg->sesskey_len); 767 ses->auth_key.len = msg->sesskey_len; 768 769 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 770 capabilities |= CAP_EXTENDED_SECURITY; 771 pSMB->req.Capabilities = cpu_to_le32(capabilities); 772 iov[1].iov_base = msg->data + msg->sesskey_len; 773 iov[1].iov_len = msg->secblob_len; 774 pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len); 775 776 if (ses->capabilities & CAP_UNICODE) { 777 /* unicode strings must be word aligned */ 778 if ((iov[0].iov_len + iov[1].iov_len) % 2) { 779 *bcc_ptr = 0; 780 bcc_ptr++; 781 } 782 unicode_oslm_strings(&bcc_ptr, nls_cp); 783 unicode_domain_string(&bcc_ptr, ses, nls_cp); 784 } else 785 /* BB: is this right? */ 786 ascii_ssetup_strings(&bcc_ptr, ses, nls_cp); 787#else /* ! CONFIG_CIFS_UPCALL */ 788 cERROR(1, "Kerberos negotiated but upcall support disabled!"); 789 rc = -ENOSYS; 790 goto ssetup_exit; 791#endif /* CONFIG_CIFS_UPCALL */ 792 } else if (type == RawNTLMSSP) { 793 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { 794 cERROR(1, "NTLMSSP requires Unicode support"); 795 rc = -ENOSYS; 796 goto ssetup_exit; 797 } 798 799 cFYI(1, "ntlmssp session setup phase %d", phase); 800 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 801 capabilities |= CAP_EXTENDED_SECURITY; 802 pSMB->req.Capabilities |= cpu_to_le32(capabilities); 803 switch(phase) { 804 case NtLmNegotiate: 805 build_ntlmssp_negotiate_blob( 806 pSMB->req.SecurityBlob, ses); 807 iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE); 808 iov[1].iov_base = pSMB->req.SecurityBlob; 809 pSMB->req.SecurityBlobLength = 810 cpu_to_le16(sizeof(NEGOTIATE_MESSAGE)); 811 break; 812 case NtLmAuthenticate: 813 /* 814 * 5 is an empirical value, large enough to hold 815 * authenticate message plus max 10 of av paris, 816 * domain, user, workstation names, flags, etc. 817 */ 818 ntlmsspblob = kzalloc( 819 5*sizeof(struct _AUTHENTICATE_MESSAGE), 820 GFP_KERNEL); 821 if (!ntlmsspblob) { 822 cERROR(1, "Can't allocate NTLMSSP blob"); 823 rc = -ENOMEM; 824 goto ssetup_exit; 825 } 826 827 rc = build_ntlmssp_auth_blob(ntlmsspblob, 828 &blob_len, ses, nls_cp); 829 if (rc) 830 goto ssetup_exit; 831 iov[1].iov_len = blob_len; 832 iov[1].iov_base = ntlmsspblob; 833 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 834 /* 835 * Make sure that we tell the server that we are using 836 * the uid that it just gave us back on the response 837 * (challenge) 838 */ 839 smb_buf->Uid = ses->Suid; 840 break; 841 default: 842 cERROR(1, "invalid phase %d", phase); 843 rc = -ENOSYS; 844 goto ssetup_exit; 845 } 846 /* unicode strings must be word aligned */ 847 if ((iov[0].iov_len + iov[1].iov_len) % 2) { 848 *bcc_ptr = 0; 849 bcc_ptr++; 850 } 851 unicode_oslm_strings(&bcc_ptr, nls_cp); 852 } else { 853 cERROR(1, "secType %d not supported!", type); 854 rc = -ENOSYS; 855 goto ssetup_exit; 856 } 857 858 iov[2].iov_base = str_area; 859 iov[2].iov_len = (long) bcc_ptr - (long) str_area; 860 861 count = iov[1].iov_len + iov[2].iov_len; 862 smb_buf->smb_buf_length += count; 863 864 put_bcc_le(count, smb_buf); 865 866 rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type, 867 CIFS_LOG_ERROR); 868 /* SMB request buf freed in SendReceive2 */ 869 870 pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base; 871 smb_buf = (struct smb_hdr *)iov[0].iov_base; 872 873 if ((type == RawNTLMSSP) && (smb_buf->Status.CifsError == 874 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) { 875 if (phase != NtLmNegotiate) { 876 cERROR(1, "Unexpected more processing error"); 877 goto ssetup_exit; 878 } 879 /* NTLMSSP Negotiate sent now processing challenge (response) */ 880 phase = NtLmChallenge; /* process ntlmssp challenge */ 881 rc = 0; /* MORE_PROC rc is not an error here, but expected */ 882 } 883 if (rc) 884 goto ssetup_exit; 885 886 if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) { 887 rc = -EIO; 888 cERROR(1, "bad word count %d", smb_buf->WordCount); 889 goto ssetup_exit; 890 } 891 action = le16_to_cpu(pSMB->resp.Action); 892 if (action & GUEST_LOGIN) 893 cFYI(1, "Guest login"); /* BB mark SesInfo struct? */ 894 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 895 cFYI(1, "UID = %d ", ses->Suid); 896 /* response can have either 3 or 4 word count - Samba sends 3 */ 897 /* and lanman response is 3 */ 898 bytes_remaining = get_bcc(smb_buf); 899 bcc_ptr = pByteArea(smb_buf); 900 901 if (smb_buf->WordCount == 4) { 902 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 903 if (blob_len > bytes_remaining) { 904 cERROR(1, "bad security blob length %d", blob_len); 905 rc = -EINVAL; 906 goto ssetup_exit; 907 } 908 if (phase == NtLmChallenge) { 909 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); 910 /* now goto beginning for ntlmssp authenticate phase */ 911 if (rc) 912 goto ssetup_exit; 913 } 914 bcc_ptr += blob_len; 915 bytes_remaining -= blob_len; 916 } 917 918 /* BB check if Unicode and decode strings */ 919 if (bytes_remaining == 0) { 920 /* no string area to decode, do nothing */ 921 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 922 /* unicode string area must be word-aligned */ 923 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { 924 ++bcc_ptr; 925 --bytes_remaining; 926 } 927 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp); 928 } else { 929 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining, 930 ses, nls_cp); 931 } 932 933ssetup_exit: 934 if (spnego_key) { 935 key_revoke(spnego_key); 936 key_put(spnego_key); 937 } 938 kfree(str_area); 939 kfree(ntlmsspblob); 940 ntlmsspblob = NULL; 941 if (resp_buf_type == CIFS_SMALL_BUFFER) { 942 cFYI(1, "ssetup freeing small buf %p", iov[0].iov_base); 943 cifs_small_buf_release(iov[0].iov_base); 944 } else if (resp_buf_type == CIFS_LARGE_BUFFER) 945 cifs_buf_release(iov[0].iov_base); 946 947 /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */ 948 if ((phase == NtLmChallenge) && (rc == 0)) 949 goto ssetup_ntlmssp_authenticate; 950 951 return rc; 952} 953