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 35static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB) 36{ 37 __u32 capabilities = 0; 38 39 /* init fields common to all four types of SessSetup */ 40 /* Note that offsets for first seven fields in req struct are same */ 41 /* in CIFS Specs so does not matter which of 3 forms of struct */ 42 /* that we use in next few lines */ 43 /* Note that header is initialized to zero in header_assemble */ 44 pSMB->req.AndXCommand = 0xFF; 45 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32, 46 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4, 47 USHRT_MAX)); 48 pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq); 49 pSMB->req.VcNumber = cpu_to_le16(1); 50 51 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */ 52 53 /* BB verify whether signing required on neg or just on auth frame 54 (and NTLM case) */ 55 56 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS | 57 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X; 58 59 if (ses->server->sign) 60 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; 61 62 if (ses->capabilities & CAP_UNICODE) { 63 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE; 64 capabilities |= CAP_UNICODE; 65 } 66 if (ses->capabilities & CAP_STATUS32) { 67 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS; 68 capabilities |= CAP_STATUS32; 69 } 70 if (ses->capabilities & CAP_DFS) { 71 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS; 72 capabilities |= CAP_DFS; 73 } 74 if (ses->capabilities & CAP_UNIX) 75 capabilities |= CAP_UNIX; 76 77 return capabilities; 78} 79 80static void 81unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp) 82{ 83 char *bcc_ptr = *pbcc_area; 84 int bytes_ret = 0; 85 86 /* Copy OS version */ 87 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32, 88 nls_cp); 89 bcc_ptr += 2 * bytes_ret; 90 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release, 91 32, nls_cp); 92 bcc_ptr += 2 * bytes_ret; 93 bcc_ptr += 2; /* trailing null */ 94 95 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS, 96 32, nls_cp); 97 bcc_ptr += 2 * bytes_ret; 98 bcc_ptr += 2; /* trailing null */ 99 100 *pbcc_area = bcc_ptr; 101} 102 103static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses, 104 const struct nls_table *nls_cp) 105{ 106 char *bcc_ptr = *pbcc_area; 107 int bytes_ret = 0; 108 109 /* copy domain */ 110 if (ses->domainName == NULL) { 111 /* Sending null domain better than using a bogus domain name (as 112 we did briefly in 2.6.18) since server will use its default */ 113 *bcc_ptr = 0; 114 *(bcc_ptr+1) = 0; 115 bytes_ret = 0; 116 } else 117 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName, 118 CIFS_MAX_DOMAINNAME_LEN, nls_cp); 119 bcc_ptr += 2 * bytes_ret; 120 bcc_ptr += 2; /* account for null terminator */ 121 122 *pbcc_area = bcc_ptr; 123} 124 125 126static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 127 const struct nls_table *nls_cp) 128{ 129 char *bcc_ptr = *pbcc_area; 130 int bytes_ret = 0; 131 132 /* BB FIXME add check that strings total less 133 than 335 or will need to send them as arrays */ 134 135 /* unicode strings, must be word aligned before the call */ 136/* if ((long) bcc_ptr % 2) { 137 *bcc_ptr = 0; 138 bcc_ptr++; 139 } */ 140 /* copy user */ 141 if (ses->user_name == NULL) { 142 /* null user mount */ 143 *bcc_ptr = 0; 144 *(bcc_ptr+1) = 0; 145 } else { 146 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name, 147 CIFS_MAX_USERNAME_LEN, nls_cp); 148 } 149 bcc_ptr += 2 * bytes_ret; 150 bcc_ptr += 2; /* account for null termination */ 151 152 unicode_domain_string(&bcc_ptr, ses, nls_cp); 153 unicode_oslm_strings(&bcc_ptr, nls_cp); 154 155 *pbcc_area = bcc_ptr; 156} 157 158static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses, 159 const struct nls_table *nls_cp) 160{ 161 char *bcc_ptr = *pbcc_area; 162 163 /* copy user */ 164 /* BB what about null user mounts - check that we do this BB */ 165 /* copy user */ 166 if (ses->user_name != NULL) { 167 strncpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN); 168 bcc_ptr += strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN); 169 } 170 /* else null user mount */ 171 *bcc_ptr = 0; 172 bcc_ptr++; /* account for null termination */ 173 174 /* copy domain */ 175 if (ses->domainName != NULL) { 176 strncpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 177 bcc_ptr += strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN); 178 } /* else we will send a null domain name 179 so the server will default to its own domain */ 180 *bcc_ptr = 0; 181 bcc_ptr++; 182 183 /* BB check for overflow here */ 184 185 strcpy(bcc_ptr, "Linux version "); 186 bcc_ptr += strlen("Linux version "); 187 strcpy(bcc_ptr, init_utsname()->release); 188 bcc_ptr += strlen(init_utsname()->release) + 1; 189 190 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS); 191 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1; 192 193 *pbcc_area = bcc_ptr; 194} 195 196static void 197decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses, 198 const struct nls_table *nls_cp) 199{ 200 int len; 201 char *data = *pbcc_area; 202 203 cifs_dbg(FYI, "bleft %d\n", bleft); 204 205 kfree(ses->serverOS); 206 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 207 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS); 208 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 209 data += len; 210 bleft -= len; 211 if (bleft <= 0) 212 return; 213 214 kfree(ses->serverNOS); 215 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 216 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS); 217 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2; 218 data += len; 219 bleft -= len; 220 if (bleft <= 0) 221 return; 222 223 kfree(ses->serverDomain); 224 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp); 225 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain); 226 227 return; 228} 229 230static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft, 231 struct cifs_ses *ses, 232 const struct nls_table *nls_cp) 233{ 234 int len; 235 char *bcc_ptr = *pbcc_area; 236 237 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft); 238 239 len = strnlen(bcc_ptr, bleft); 240 if (len >= bleft) 241 return; 242 243 kfree(ses->serverOS); 244 245 ses->serverOS = kzalloc(len + 1, GFP_KERNEL); 246 if (ses->serverOS) { 247 strncpy(ses->serverOS, bcc_ptr, len); 248 if (strncmp(ses->serverOS, "OS/2", 4) == 0) 249 cifs_dbg(FYI, "OS/2 server\n"); 250 } 251 252 bcc_ptr += len + 1; 253 bleft -= len + 1; 254 255 len = strnlen(bcc_ptr, bleft); 256 if (len >= bleft) 257 return; 258 259 kfree(ses->serverNOS); 260 261 ses->serverNOS = kzalloc(len + 1, GFP_KERNEL); 262 if (ses->serverNOS) 263 strncpy(ses->serverNOS, bcc_ptr, len); 264 265 bcc_ptr += len + 1; 266 bleft -= len + 1; 267 268 len = strnlen(bcc_ptr, bleft); 269 if (len > bleft) 270 return; 271 272 /* No domain field in LANMAN case. Domain is 273 returned by old servers in the SMB negprot response */ 274 /* BB For newer servers which do not support Unicode, 275 but thus do return domain here we could add parsing 276 for it later, but it is not very important */ 277 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft); 278} 279 280int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len, 281 struct cifs_ses *ses) 282{ 283 unsigned int tioffset; /* challenge message target info area */ 284 unsigned int tilen; /* challenge message target info area length */ 285 286 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr; 287 288 if (blob_len < sizeof(CHALLENGE_MESSAGE)) { 289 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len); 290 return -EINVAL; 291 } 292 293 if (memcmp(pblob->Signature, "NTLMSSP", 8)) { 294 cifs_dbg(VFS, "blob signature incorrect %s\n", 295 pblob->Signature); 296 return -EINVAL; 297 } 298 if (pblob->MessageType != NtLmChallenge) { 299 cifs_dbg(VFS, "Incorrect message type %d\n", 300 pblob->MessageType); 301 return -EINVAL; 302 } 303 304 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE); 305 /* BB we could decode pblob->NegotiateFlags; some may be useful */ 306 /* In particular we can examine sign flags */ 307 /* BB spec says that if AvId field of MsvAvTimestamp is populated then 308 we must set the MIC field of the AUTHENTICATE_MESSAGE */ 309 ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags); 310 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset); 311 tilen = le16_to_cpu(pblob->TargetInfoArray.Length); 312 if (tioffset > blob_len || tioffset + tilen > blob_len) { 313 cifs_dbg(VFS, "tioffset + tilen too high %u + %u", 314 tioffset, tilen); 315 return -EINVAL; 316 } 317 if (tilen) { 318 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen, 319 GFP_KERNEL); 320 if (!ses->auth_key.response) { 321 cifs_dbg(VFS, "Challenge target info alloc failure"); 322 return -ENOMEM; 323 } 324 ses->auth_key.len = tilen; 325 } 326 327 return 0; 328} 329 330/* BB Move to ntlmssp.c eventually */ 331 332/* We do not malloc the blob, it is passed in pbuffer, because 333 it is fixed size, and small, making this approach cleaner */ 334void build_ntlmssp_negotiate_blob(unsigned char *pbuffer, 335 struct cifs_ses *ses) 336{ 337 NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer; 338 __u32 flags; 339 340 memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE)); 341 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 342 sec_blob->MessageType = NtLmNegotiate; 343 344 /* BB is NTLMV2 session security format easier to use here? */ 345 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET | 346 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 347 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; 348 if (ses->server->sign) { 349 flags |= NTLMSSP_NEGOTIATE_SIGN; 350 if (!ses->server->session_estab || 351 ses->ntlmssp->sesskey_per_smbsess) 352 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 353 } 354 355 sec_blob->NegotiateFlags = cpu_to_le32(flags); 356 357 sec_blob->WorkstationName.BufferOffset = 0; 358 sec_blob->WorkstationName.Length = 0; 359 sec_blob->WorkstationName.MaximumLength = 0; 360 361 /* Domain name is sent on the Challenge not Negotiate NTLMSSP request */ 362 sec_blob->DomainName.BufferOffset = 0; 363 sec_blob->DomainName.Length = 0; 364 sec_blob->DomainName.MaximumLength = 0; 365} 366 367/* We do not malloc the blob, it is passed in pbuffer, because its 368 maximum possible size is fixed and small, making this approach cleaner. 369 This function returns the length of the data in the blob */ 370int build_ntlmssp_auth_blob(unsigned char *pbuffer, 371 u16 *buflen, 372 struct cifs_ses *ses, 373 const struct nls_table *nls_cp) 374{ 375 int rc; 376 AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer; 377 __u32 flags; 378 unsigned char *tmp; 379 380 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8); 381 sec_blob->MessageType = NtLmAuthenticate; 382 383 flags = NTLMSSP_NEGOTIATE_56 | 384 NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO | 385 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE | 386 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC; 387 if (ses->server->sign) { 388 flags |= NTLMSSP_NEGOTIATE_SIGN; 389 if (!ses->server->session_estab || 390 ses->ntlmssp->sesskey_per_smbsess) 391 flags |= NTLMSSP_NEGOTIATE_KEY_XCH; 392 } 393 394 tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE); 395 sec_blob->NegotiateFlags = cpu_to_le32(flags); 396 397 sec_blob->LmChallengeResponse.BufferOffset = 398 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE)); 399 sec_blob->LmChallengeResponse.Length = 0; 400 sec_blob->LmChallengeResponse.MaximumLength = 0; 401 402 sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer); 403 if (ses->user_name != NULL) { 404 rc = setup_ntlmv2_rsp(ses, nls_cp); 405 if (rc) { 406 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc); 407 goto setup_ntlmv2_ret; 408 } 409 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 410 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 411 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 412 413 sec_blob->NtChallengeResponse.Length = 414 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 415 sec_blob->NtChallengeResponse.MaximumLength = 416 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 417 } else { 418 /* 419 * don't send an NT Response for anonymous access 420 */ 421 sec_blob->NtChallengeResponse.Length = 0; 422 sec_blob->NtChallengeResponse.MaximumLength = 0; 423 } 424 425 if (ses->domainName == NULL) { 426 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); 427 sec_blob->DomainName.Length = 0; 428 sec_blob->DomainName.MaximumLength = 0; 429 tmp += 2; 430 } else { 431 int len; 432 len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName, 433 CIFS_MAX_USERNAME_LEN, nls_cp); 434 len *= 2; /* unicode is 2 bytes each */ 435 sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer); 436 sec_blob->DomainName.Length = cpu_to_le16(len); 437 sec_blob->DomainName.MaximumLength = cpu_to_le16(len); 438 tmp += len; 439 } 440 441 if (ses->user_name == NULL) { 442 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); 443 sec_blob->UserName.Length = 0; 444 sec_blob->UserName.MaximumLength = 0; 445 tmp += 2; 446 } else { 447 int len; 448 len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name, 449 CIFS_MAX_USERNAME_LEN, nls_cp); 450 len *= 2; /* unicode is 2 bytes each */ 451 sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer); 452 sec_blob->UserName.Length = cpu_to_le16(len); 453 sec_blob->UserName.MaximumLength = cpu_to_le16(len); 454 tmp += len; 455 } 456 457 sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer); 458 sec_blob->WorkstationName.Length = 0; 459 sec_blob->WorkstationName.MaximumLength = 0; 460 tmp += 2; 461 462 if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) || 463 (ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) 464 && !calc_seckey(ses)) { 465 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE); 466 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); 467 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE); 468 sec_blob->SessionKey.MaximumLength = 469 cpu_to_le16(CIFS_CPHTXT_SIZE); 470 tmp += CIFS_CPHTXT_SIZE; 471 } else { 472 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer); 473 sec_blob->SessionKey.Length = 0; 474 sec_blob->SessionKey.MaximumLength = 0; 475 } 476 477setup_ntlmv2_ret: 478 *buflen = tmp - pbuffer; 479 return rc; 480} 481 482enum securityEnum 483select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) 484{ 485 switch (server->negflavor) { 486 case CIFS_NEGFLAVOR_EXTENDED: 487 switch (requested) { 488 case Kerberos: 489 case RawNTLMSSP: 490 return requested; 491 case Unspecified: 492 if (server->sec_ntlmssp && 493 (global_secflags & CIFSSEC_MAY_NTLMSSP)) 494 return RawNTLMSSP; 495 if ((server->sec_kerberos || server->sec_mskerberos) && 496 (global_secflags & CIFSSEC_MAY_KRB5)) 497 return Kerberos; 498 /* Fallthrough */ 499 default: 500 return Unspecified; 501 } 502 case CIFS_NEGFLAVOR_UNENCAP: 503 switch (requested) { 504 case NTLM: 505 case NTLMv2: 506 return requested; 507 case Unspecified: 508 if (global_secflags & CIFSSEC_MAY_NTLMV2) 509 return NTLMv2; 510 if (global_secflags & CIFSSEC_MAY_NTLM) 511 return NTLM; 512 default: 513 /* Fallthrough to attempt LANMAN authentication next */ 514 break; 515 } 516 case CIFS_NEGFLAVOR_LANMAN: 517 switch (requested) { 518 case LANMAN: 519 return requested; 520 case Unspecified: 521 if (global_secflags & CIFSSEC_MAY_LANMAN) 522 return LANMAN; 523 /* Fallthrough */ 524 default: 525 return Unspecified; 526 } 527 default: 528 return Unspecified; 529 } 530} 531 532struct sess_data { 533 unsigned int xid; 534 struct cifs_ses *ses; 535 struct nls_table *nls_cp; 536 void (*func)(struct sess_data *); 537 int result; 538 539 /* we will send the SMB in three pieces: 540 * a fixed length beginning part, an optional 541 * SPNEGO blob (which can be zero length), and a 542 * last part which will include the strings 543 * and rest of bcc area. This allows us to avoid 544 * a large buffer 17K allocation 545 */ 546 int buf0_type; 547 struct kvec iov[3]; 548}; 549 550static int 551sess_alloc_buffer(struct sess_data *sess_data, int wct) 552{ 553 int rc; 554 struct cifs_ses *ses = sess_data->ses; 555 struct smb_hdr *smb_buf; 556 557 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses, 558 (void **)&smb_buf); 559 560 if (rc) 561 return rc; 562 563 sess_data->iov[0].iov_base = (char *)smb_buf; 564 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4; 565 /* 566 * This variable will be used to clear the buffer 567 * allocated above in case of any error in the calling function. 568 */ 569 sess_data->buf0_type = CIFS_SMALL_BUFFER; 570 571 /* 2000 big enough to fit max user, domain, NOS name etc. */ 572 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL); 573 if (!sess_data->iov[2].iov_base) { 574 rc = -ENOMEM; 575 goto out_free_smb_buf; 576 } 577 578 return 0; 579 580out_free_smb_buf: 581 kfree(smb_buf); 582 sess_data->iov[0].iov_base = NULL; 583 sess_data->iov[0].iov_len = 0; 584 sess_data->buf0_type = CIFS_NO_BUFFER; 585 return rc; 586} 587 588static void 589sess_free_buffer(struct sess_data *sess_data) 590{ 591 592 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base); 593 sess_data->buf0_type = CIFS_NO_BUFFER; 594 kfree(sess_data->iov[2].iov_base); 595} 596 597static int 598sess_establish_session(struct sess_data *sess_data) 599{ 600 struct cifs_ses *ses = sess_data->ses; 601 602 mutex_lock(&ses->server->srv_mutex); 603 if (!ses->server->session_estab) { 604 if (ses->server->sign) { 605 ses->server->session_key.response = 606 kmemdup(ses->auth_key.response, 607 ses->auth_key.len, GFP_KERNEL); 608 if (!ses->server->session_key.response) { 609 mutex_unlock(&ses->server->srv_mutex); 610 return -ENOMEM; 611 } 612 ses->server->session_key.len = 613 ses->auth_key.len; 614 } 615 ses->server->sequence_number = 0x2; 616 ses->server->session_estab = true; 617 } 618 mutex_unlock(&ses->server->srv_mutex); 619 620 cifs_dbg(FYI, "CIFS session established successfully\n"); 621 spin_lock(&GlobalMid_Lock); 622 ses->status = CifsGood; 623 ses->need_reconnect = false; 624 spin_unlock(&GlobalMid_Lock); 625 626 return 0; 627} 628 629static int 630sess_sendreceive(struct sess_data *sess_data) 631{ 632 int rc; 633 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base; 634 __u16 count; 635 636 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len; 637 smb_buf->smb_buf_length = 638 cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count); 639 put_bcc(count, smb_buf); 640 641 rc = SendReceive2(sess_data->xid, sess_data->ses, 642 sess_data->iov, 3 /* num_iovecs */, 643 &sess_data->buf0_type, 644 CIFS_LOG_ERROR); 645 646 return rc; 647} 648 649/* 650 * LANMAN and plaintext are less secure and off by default. 651 * So we make this explicitly be turned on in kconfig (in the 652 * build) and turned on at runtime (changed from the default) 653 * in proc/fs/cifs or via mount parm. Unfortunately this is 654 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 655 */ 656#ifdef CONFIG_CIFS_WEAK_PW_HASH 657static void 658sess_auth_lanman(struct sess_data *sess_data) 659{ 660 int rc = 0; 661 struct smb_hdr *smb_buf; 662 SESSION_SETUP_ANDX *pSMB; 663 char *bcc_ptr; 664 struct cifs_ses *ses = sess_data->ses; 665 char lnm_session_key[CIFS_AUTH_RESP_SIZE]; 666 __u32 capabilities; 667 __u16 bytes_remaining; 668 669 /* lanman 2 style sessionsetup */ 670 /* wct = 10 */ 671 rc = sess_alloc_buffer(sess_data, 10); 672 if (rc) 673 goto out; 674 675 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 676 bcc_ptr = sess_data->iov[2].iov_base; 677 capabilities = cifs_ssetup_hdr(ses, pSMB); 678 679 pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE; 680 681 if (ses->user_name != NULL) { 682 /* no capabilities flags in old lanman negotiation */ 683 pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE); 684 685 /* Calculate hash with password and copy into bcc_ptr. 686 * Encryption Key (stored as in cryptkey) gets used if the 687 * security mode bit in Negottiate Protocol response states 688 * to use challenge/response method (i.e. Password bit is 1). 689 */ 690 rc = calc_lanman_hash(ses->password, ses->server->cryptkey, 691 ses->server->sec_mode & SECMODE_PW_ENCRYPT ? 692 true : false, lnm_session_key); 693 694 memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE); 695 bcc_ptr += CIFS_AUTH_RESP_SIZE; 696 } else { 697 pSMB->old_req.PasswordLength = 0; 698 } 699 700 /* 701 * can not sign if LANMAN negotiated so no need 702 * to calculate signing key? but what if server 703 * changed to do higher than lanman dialect and 704 * we reconnected would we ever calc signing_key? 705 */ 706 707 cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n"); 708 /* Unicode not allowed for LANMAN dialects */ 709 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 710 711 sess_data->iov[2].iov_len = (long) bcc_ptr - 712 (long) sess_data->iov[2].iov_base; 713 714 rc = sess_sendreceive(sess_data); 715 if (rc) 716 goto out; 717 718 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 719 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 720 721 /* lanman response has a word count of 3 */ 722 if (smb_buf->WordCount != 3) { 723 rc = -EIO; 724 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 725 goto out; 726 } 727 728 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 729 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 730 731 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 732 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 733 734 bytes_remaining = get_bcc(smb_buf); 735 bcc_ptr = pByteArea(smb_buf); 736 737 /* BB check if Unicode and decode strings */ 738 if (bytes_remaining == 0) { 739 /* no string area to decode, do nothing */ 740 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 741 /* unicode string area must be word-aligned */ 742 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { 743 ++bcc_ptr; 744 --bytes_remaining; 745 } 746 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 747 sess_data->nls_cp); 748 } else { 749 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 750 sess_data->nls_cp); 751 } 752 753 rc = sess_establish_session(sess_data); 754out: 755 sess_data->result = rc; 756 sess_data->func = NULL; 757 sess_free_buffer(sess_data); 758} 759 760#endif 761 762static void 763sess_auth_ntlm(struct sess_data *sess_data) 764{ 765 int rc = 0; 766 struct smb_hdr *smb_buf; 767 SESSION_SETUP_ANDX *pSMB; 768 char *bcc_ptr; 769 struct cifs_ses *ses = sess_data->ses; 770 __u32 capabilities; 771 __u16 bytes_remaining; 772 773 /* old style NTLM sessionsetup */ 774 /* wct = 13 */ 775 rc = sess_alloc_buffer(sess_data, 13); 776 if (rc) 777 goto out; 778 779 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 780 bcc_ptr = sess_data->iov[2].iov_base; 781 capabilities = cifs_ssetup_hdr(ses, pSMB); 782 783 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 784 if (ses->user_name != NULL) { 785 pSMB->req_no_secext.CaseInsensitivePasswordLength = 786 cpu_to_le16(CIFS_AUTH_RESP_SIZE); 787 pSMB->req_no_secext.CaseSensitivePasswordLength = 788 cpu_to_le16(CIFS_AUTH_RESP_SIZE); 789 790 /* calculate ntlm response and session key */ 791 rc = setup_ntlm_response(ses, sess_data->nls_cp); 792 if (rc) { 793 cifs_dbg(VFS, "Error %d during NTLM authentication\n", 794 rc); 795 goto out; 796 } 797 798 /* copy ntlm response */ 799 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 800 CIFS_AUTH_RESP_SIZE); 801 bcc_ptr += CIFS_AUTH_RESP_SIZE; 802 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 803 CIFS_AUTH_RESP_SIZE); 804 bcc_ptr += CIFS_AUTH_RESP_SIZE; 805 } else { 806 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; 807 pSMB->req_no_secext.CaseSensitivePasswordLength = 0; 808 } 809 810 if (ses->capabilities & CAP_UNICODE) { 811 /* unicode strings must be word aligned */ 812 if (sess_data->iov[0].iov_len % 2) { 813 *bcc_ptr = 0; 814 bcc_ptr++; 815 } 816 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 817 } else { 818 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 819 } 820 821 822 sess_data->iov[2].iov_len = (long) bcc_ptr - 823 (long) sess_data->iov[2].iov_base; 824 825 rc = sess_sendreceive(sess_data); 826 if (rc) 827 goto out; 828 829 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 830 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 831 832 if (smb_buf->WordCount != 3) { 833 rc = -EIO; 834 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 835 goto out; 836 } 837 838 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 839 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 840 841 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 842 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 843 844 bytes_remaining = get_bcc(smb_buf); 845 bcc_ptr = pByteArea(smb_buf); 846 847 /* BB check if Unicode and decode strings */ 848 if (bytes_remaining == 0) { 849 /* no string area to decode, do nothing */ 850 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 851 /* unicode string area must be word-aligned */ 852 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { 853 ++bcc_ptr; 854 --bytes_remaining; 855 } 856 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 857 sess_data->nls_cp); 858 } else { 859 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 860 sess_data->nls_cp); 861 } 862 863 rc = sess_establish_session(sess_data); 864out: 865 sess_data->result = rc; 866 sess_data->func = NULL; 867 sess_free_buffer(sess_data); 868 kfree(ses->auth_key.response); 869 ses->auth_key.response = NULL; 870} 871 872static void 873sess_auth_ntlmv2(struct sess_data *sess_data) 874{ 875 int rc = 0; 876 struct smb_hdr *smb_buf; 877 SESSION_SETUP_ANDX *pSMB; 878 char *bcc_ptr; 879 struct cifs_ses *ses = sess_data->ses; 880 __u32 capabilities; 881 __u16 bytes_remaining; 882 883 /* old style NTLM sessionsetup */ 884 /* wct = 13 */ 885 rc = sess_alloc_buffer(sess_data, 13); 886 if (rc) 887 goto out; 888 889 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 890 bcc_ptr = sess_data->iov[2].iov_base; 891 capabilities = cifs_ssetup_hdr(ses, pSMB); 892 893 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); 894 895 /* LM2 password would be here if we supported it */ 896 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; 897 898 if (ses->user_name != NULL) { 899 /* calculate nlmv2 response and session key */ 900 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp); 901 if (rc) { 902 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc); 903 goto out; 904 } 905 906 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, 907 ses->auth_key.len - CIFS_SESS_KEY_SIZE); 908 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE; 909 910 /* set case sensitive password length after tilen may get 911 * assigned, tilen is 0 otherwise. 912 */ 913 pSMB->req_no_secext.CaseSensitivePasswordLength = 914 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE); 915 } else { 916 pSMB->req_no_secext.CaseSensitivePasswordLength = 0; 917 } 918 919 if (ses->capabilities & CAP_UNICODE) { 920 if (sess_data->iov[0].iov_len % 2) { 921 *bcc_ptr = 0; 922 bcc_ptr++; 923 } 924 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 925 } else { 926 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 927 } 928 929 930 sess_data->iov[2].iov_len = (long) bcc_ptr - 931 (long) sess_data->iov[2].iov_base; 932 933 rc = sess_sendreceive(sess_data); 934 if (rc) 935 goto out; 936 937 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 938 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 939 940 if (smb_buf->WordCount != 3) { 941 rc = -EIO; 942 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 943 goto out; 944 } 945 946 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 947 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 948 949 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 950 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 951 952 bytes_remaining = get_bcc(smb_buf); 953 bcc_ptr = pByteArea(smb_buf); 954 955 /* BB check if Unicode and decode strings */ 956 if (bytes_remaining == 0) { 957 /* no string area to decode, do nothing */ 958 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 959 /* unicode string area must be word-aligned */ 960 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { 961 ++bcc_ptr; 962 --bytes_remaining; 963 } 964 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 965 sess_data->nls_cp); 966 } else { 967 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 968 sess_data->nls_cp); 969 } 970 971 rc = sess_establish_session(sess_data); 972out: 973 sess_data->result = rc; 974 sess_data->func = NULL; 975 sess_free_buffer(sess_data); 976 kfree(ses->auth_key.response); 977 ses->auth_key.response = NULL; 978} 979 980#ifdef CONFIG_CIFS_UPCALL 981static void 982sess_auth_kerberos(struct sess_data *sess_data) 983{ 984 int rc = 0; 985 struct smb_hdr *smb_buf; 986 SESSION_SETUP_ANDX *pSMB; 987 char *bcc_ptr; 988 struct cifs_ses *ses = sess_data->ses; 989 __u32 capabilities; 990 __u16 bytes_remaining; 991 struct key *spnego_key = NULL; 992 struct cifs_spnego_msg *msg; 993 u16 blob_len; 994 995 /* extended security */ 996 /* wct = 12 */ 997 rc = sess_alloc_buffer(sess_data, 12); 998 if (rc) 999 goto out; 1000 1001 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1002 bcc_ptr = sess_data->iov[2].iov_base; 1003 capabilities = cifs_ssetup_hdr(ses, pSMB); 1004 1005 spnego_key = cifs_get_spnego_key(ses); 1006 if (IS_ERR(spnego_key)) { 1007 rc = PTR_ERR(spnego_key); 1008 spnego_key = NULL; 1009 goto out; 1010 } 1011 1012 msg = spnego_key->payload.data; 1013 /* 1014 * check version field to make sure that cifs.upcall is 1015 * sending us a response in an expected form 1016 */ 1017 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 1018 cifs_dbg(VFS, 1019 "incorrect version of cifs.upcall (expected %d but got %d)", 1020 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 1021 rc = -EKEYREJECTED; 1022 goto out_put_spnego_key; 1023 } 1024 1025 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, 1026 GFP_KERNEL); 1027 if (!ses->auth_key.response) { 1028 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory", 1029 msg->sesskey_len); 1030 rc = -ENOMEM; 1031 goto out_put_spnego_key; 1032 } 1033 ses->auth_key.len = msg->sesskey_len; 1034 1035 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1036 capabilities |= CAP_EXTENDED_SECURITY; 1037 pSMB->req.Capabilities = cpu_to_le32(capabilities); 1038 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; 1039 sess_data->iov[1].iov_len = msg->secblob_len; 1040 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len); 1041 1042 if (ses->capabilities & CAP_UNICODE) { 1043 /* unicode strings must be word aligned */ 1044 if ((sess_data->iov[0].iov_len 1045 + sess_data->iov[1].iov_len) % 2) { 1046 *bcc_ptr = 0; 1047 bcc_ptr++; 1048 } 1049 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1050 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp); 1051 } else { 1052 /* BB: is this right? */ 1053 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp); 1054 } 1055 1056 sess_data->iov[2].iov_len = (long) bcc_ptr - 1057 (long) sess_data->iov[2].iov_base; 1058 1059 rc = sess_sendreceive(sess_data); 1060 if (rc) 1061 goto out_put_spnego_key; 1062 1063 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1064 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1065 1066 if (smb_buf->WordCount != 4) { 1067 rc = -EIO; 1068 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1069 goto out_put_spnego_key; 1070 } 1071 1072 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1073 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1074 1075 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1076 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1077 1078 bytes_remaining = get_bcc(smb_buf); 1079 bcc_ptr = pByteArea(smb_buf); 1080 1081 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1082 if (blob_len > bytes_remaining) { 1083 cifs_dbg(VFS, "bad security blob length %d\n", 1084 blob_len); 1085 rc = -EINVAL; 1086 goto out_put_spnego_key; 1087 } 1088 bcc_ptr += blob_len; 1089 bytes_remaining -= blob_len; 1090 1091 /* BB check if Unicode and decode strings */ 1092 if (bytes_remaining == 0) { 1093 /* no string area to decode, do nothing */ 1094 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1095 /* unicode string area must be word-aligned */ 1096 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { 1097 ++bcc_ptr; 1098 --bytes_remaining; 1099 } 1100 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1101 sess_data->nls_cp); 1102 } else { 1103 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1104 sess_data->nls_cp); 1105 } 1106 1107 rc = sess_establish_session(sess_data); 1108out_put_spnego_key: 1109 key_invalidate(spnego_key); 1110 key_put(spnego_key); 1111out: 1112 sess_data->result = rc; 1113 sess_data->func = NULL; 1114 sess_free_buffer(sess_data); 1115 kfree(ses->auth_key.response); 1116 ses->auth_key.response = NULL; 1117} 1118 1119#endif /* ! CONFIG_CIFS_UPCALL */ 1120 1121/* 1122 * The required kvec buffers have to be allocated before calling this 1123 * function. 1124 */ 1125static int 1126_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data) 1127{ 1128 struct smb_hdr *smb_buf; 1129 SESSION_SETUP_ANDX *pSMB; 1130 struct cifs_ses *ses = sess_data->ses; 1131 __u32 capabilities; 1132 char *bcc_ptr; 1133 1134 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1135 smb_buf = (struct smb_hdr *)pSMB; 1136 1137 capabilities = cifs_ssetup_hdr(ses, pSMB); 1138 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) { 1139 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n"); 1140 return -ENOSYS; 1141 } 1142 1143 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC; 1144 capabilities |= CAP_EXTENDED_SECURITY; 1145 pSMB->req.Capabilities |= cpu_to_le32(capabilities); 1146 1147 bcc_ptr = sess_data->iov[2].iov_base; 1148 /* unicode strings must be word aligned */ 1149 if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) { 1150 *bcc_ptr = 0; 1151 bcc_ptr++; 1152 } 1153 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp); 1154 1155 sess_data->iov[2].iov_len = (long) bcc_ptr - 1156 (long) sess_data->iov[2].iov_base; 1157 1158 return 0; 1159} 1160 1161static void 1162sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data); 1163 1164static void 1165sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data) 1166{ 1167 int rc; 1168 struct smb_hdr *smb_buf; 1169 SESSION_SETUP_ANDX *pSMB; 1170 struct cifs_ses *ses = sess_data->ses; 1171 __u16 bytes_remaining; 1172 char *bcc_ptr; 1173 u16 blob_len; 1174 1175 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n"); 1176 1177 /* 1178 * if memory allocation is successful, caller of this function 1179 * frees it. 1180 */ 1181 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); 1182 if (!ses->ntlmssp) { 1183 rc = -ENOMEM; 1184 goto out; 1185 } 1186 ses->ntlmssp->sesskey_per_smbsess = false; 1187 1188 /* wct = 12 */ 1189 rc = sess_alloc_buffer(sess_data, 12); 1190 if (rc) 1191 goto out; 1192 1193 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1194 1195 /* Build security blob before we assemble the request */ 1196 build_ntlmssp_negotiate_blob(pSMB->req.SecurityBlob, ses); 1197 sess_data->iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE); 1198 sess_data->iov[1].iov_base = pSMB->req.SecurityBlob; 1199 pSMB->req.SecurityBlobLength = cpu_to_le16(sizeof(NEGOTIATE_MESSAGE)); 1200 1201 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1202 if (rc) 1203 goto out; 1204 1205 rc = sess_sendreceive(sess_data); 1206 1207 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1208 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1209 1210 /* If true, rc here is expected and not an error */ 1211 if (sess_data->buf0_type != CIFS_NO_BUFFER && 1212 smb_buf->Status.CifsError == 1213 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)) 1214 rc = 0; 1215 1216 if (rc) 1217 goto out; 1218 1219 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); 1220 1221 if (smb_buf->WordCount != 4) { 1222 rc = -EIO; 1223 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1224 goto out; 1225 } 1226 1227 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */ 1228 cifs_dbg(FYI, "UID = %llu\n", ses->Suid); 1229 1230 bytes_remaining = get_bcc(smb_buf); 1231 bcc_ptr = pByteArea(smb_buf); 1232 1233 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1234 if (blob_len > bytes_remaining) { 1235 cifs_dbg(VFS, "bad security blob length %d\n", 1236 blob_len); 1237 rc = -EINVAL; 1238 goto out; 1239 } 1240 1241 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); 1242out: 1243 sess_free_buffer(sess_data); 1244 1245 if (!rc) { 1246 sess_data->func = sess_auth_rawntlmssp_authenticate; 1247 return; 1248 } 1249 1250 /* Else error. Cleanup */ 1251 kfree(ses->auth_key.response); 1252 ses->auth_key.response = NULL; 1253 kfree(ses->ntlmssp); 1254 ses->ntlmssp = NULL; 1255 1256 sess_data->func = NULL; 1257 sess_data->result = rc; 1258} 1259 1260static void 1261sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data) 1262{ 1263 int rc; 1264 struct smb_hdr *smb_buf; 1265 SESSION_SETUP_ANDX *pSMB; 1266 struct cifs_ses *ses = sess_data->ses; 1267 __u16 bytes_remaining; 1268 char *bcc_ptr; 1269 char *ntlmsspblob = NULL; 1270 u16 blob_len; 1271 1272 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n"); 1273 1274 /* wct = 12 */ 1275 rc = sess_alloc_buffer(sess_data, 12); 1276 if (rc) 1277 goto out; 1278 1279 /* Build security blob before we assemble the request */ 1280 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1281 smb_buf = (struct smb_hdr *)pSMB; 1282 /* 1283 * 5 is an empirical value, large enough to hold 1284 * authenticate message plus max 10 of av paris, 1285 * domain, user, workstation names, flags, etc. 1286 */ 1287 ntlmsspblob = kzalloc(5*sizeof(struct _AUTHENTICATE_MESSAGE), 1288 GFP_KERNEL); 1289 if (!ntlmsspblob) { 1290 rc = -ENOMEM; 1291 goto out; 1292 } 1293 1294 rc = build_ntlmssp_auth_blob(ntlmsspblob, 1295 &blob_len, ses, sess_data->nls_cp); 1296 if (rc) 1297 goto out_free_ntlmsspblob; 1298 sess_data->iov[1].iov_len = blob_len; 1299 sess_data->iov[1].iov_base = ntlmsspblob; 1300 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len); 1301 /* 1302 * Make sure that we tell the server that we are using 1303 * the uid that it just gave us back on the response 1304 * (challenge) 1305 */ 1306 smb_buf->Uid = ses->Suid; 1307 1308 rc = _sess_auth_rawntlmssp_assemble_req(sess_data); 1309 if (rc) 1310 goto out_free_ntlmsspblob; 1311 1312 rc = sess_sendreceive(sess_data); 1313 if (rc) 1314 goto out_free_ntlmsspblob; 1315 1316 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base; 1317 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base; 1318 if (smb_buf->WordCount != 4) { 1319 rc = -EIO; 1320 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount); 1321 goto out_free_ntlmsspblob; 1322 } 1323 1324 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN) 1325 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */ 1326 1327 if (ses->Suid != smb_buf->Uid) { 1328 ses->Suid = smb_buf->Uid; 1329 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid); 1330 } 1331 1332 bytes_remaining = get_bcc(smb_buf); 1333 bcc_ptr = pByteArea(smb_buf); 1334 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength); 1335 if (blob_len > bytes_remaining) { 1336 cifs_dbg(VFS, "bad security blob length %d\n", 1337 blob_len); 1338 rc = -EINVAL; 1339 goto out_free_ntlmsspblob; 1340 } 1341 bcc_ptr += blob_len; 1342 bytes_remaining -= blob_len; 1343 1344 1345 /* BB check if Unicode and decode strings */ 1346 if (bytes_remaining == 0) { 1347 /* no string area to decode, do nothing */ 1348 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) { 1349 /* unicode string area must be word-aligned */ 1350 if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) { 1351 ++bcc_ptr; 1352 --bytes_remaining; 1353 } 1354 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, 1355 sess_data->nls_cp); 1356 } else { 1357 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, 1358 sess_data->nls_cp); 1359 } 1360 1361out_free_ntlmsspblob: 1362 kfree(ntlmsspblob); 1363out: 1364 sess_free_buffer(sess_data); 1365 1366 if (!rc) 1367 rc = sess_establish_session(sess_data); 1368 1369 /* Cleanup */ 1370 kfree(ses->auth_key.response); 1371 ses->auth_key.response = NULL; 1372 kfree(ses->ntlmssp); 1373 ses->ntlmssp = NULL; 1374 1375 sess_data->func = NULL; 1376 sess_data->result = rc; 1377} 1378 1379static int select_sec(struct cifs_ses *ses, struct sess_data *sess_data) 1380{ 1381 int type; 1382 1383 type = select_sectype(ses->server, ses->sectype); 1384 cifs_dbg(FYI, "sess setup type %d\n", type); 1385 if (type == Unspecified) { 1386 cifs_dbg(VFS, 1387 "Unable to select appropriate authentication method!"); 1388 return -EINVAL; 1389 } 1390 1391 switch (type) { 1392 case LANMAN: 1393 /* LANMAN and plaintext are less secure and off by default. 1394 * So we make this explicitly be turned on in kconfig (in the 1395 * build) and turned on at runtime (changed from the default) 1396 * in proc/fs/cifs or via mount parm. Unfortunately this is 1397 * needed for old Win (e.g. Win95), some obscure NAS and OS/2 */ 1398#ifdef CONFIG_CIFS_WEAK_PW_HASH 1399 sess_data->func = sess_auth_lanman; 1400 break; 1401#else 1402 return -EOPNOTSUPP; 1403#endif 1404 case NTLM: 1405 sess_data->func = sess_auth_ntlm; 1406 break; 1407 case NTLMv2: 1408 sess_data->func = sess_auth_ntlmv2; 1409 break; 1410 case Kerberos: 1411#ifdef CONFIG_CIFS_UPCALL 1412 sess_data->func = sess_auth_kerberos; 1413 break; 1414#else 1415 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); 1416 return -ENOSYS; 1417 break; 1418#endif /* CONFIG_CIFS_UPCALL */ 1419 case RawNTLMSSP: 1420 sess_data->func = sess_auth_rawntlmssp_negotiate; 1421 break; 1422 default: 1423 cifs_dbg(VFS, "secType %d not supported!\n", type); 1424 return -ENOSYS; 1425 } 1426 1427 return 0; 1428} 1429 1430int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, 1431 const struct nls_table *nls_cp) 1432{ 1433 int rc = 0; 1434 struct sess_data *sess_data; 1435 1436 if (ses == NULL) { 1437 WARN(1, "%s: ses == NULL!", __func__); 1438 return -EINVAL; 1439 } 1440 1441 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL); 1442 if (!sess_data) 1443 return -ENOMEM; 1444 1445 rc = select_sec(ses, sess_data); 1446 if (rc) 1447 goto out; 1448 1449 sess_data->xid = xid; 1450 sess_data->ses = ses; 1451 sess_data->buf0_type = CIFS_NO_BUFFER; 1452 sess_data->nls_cp = (struct nls_table *) nls_cp; 1453 1454 while (sess_data->func) 1455 sess_data->func(sess_data); 1456 1457 /* Store result before we free sess_data */ 1458 rc = sess_data->result; 1459 1460out: 1461 kfree(sess_data); 1462 return rc; 1463} 1464