1// SPDX-License-Identifier: LGPL-2.1 2/* 3 * 4 * Encryption and hashing operations relating to NTLM, NTLMv2. See MS-NLMP 5 * for more detailed information 6 * 7 * Copyright (C) International Business Machines Corp., 2005,2013 8 * Author(s): Steve French (sfrench@us.ibm.com) 9 * 10 */ 11 12#include <linux/fs.h> 13#include <linux/slab.h> 14#include "cifspdu.h" 15#include "cifsglob.h" 16#include "cifs_debug.h" 17#include "cifs_unicode.h" 18#include "cifsproto.h" 19#include "ntlmssp.h" 20#include <linux/ctype.h> 21#include <linux/random.h> 22#include <linux/highmem.h> 23#include <linux/fips.h> 24#include "../common/arc4.h" 25#include <crypto/aead.h> 26 27/* 28 * Hash data from a BVEC-type iterator. 29 */ 30static int cifs_shash_bvec(const struct iov_iter *iter, ssize_t maxsize, 31 struct shash_desc *shash) 32{ 33 const struct bio_vec *bv = iter->bvec; 34 unsigned long start = iter->iov_offset; 35 unsigned int i; 36 void *p; 37 int ret; 38 39 for (i = 0; i < iter->nr_segs; i++) { 40 size_t off, len; 41 42 len = bv[i].bv_len; 43 if (start >= len) { 44 start -= len; 45 continue; 46 } 47 48 len = min_t(size_t, maxsize, len - start); 49 off = bv[i].bv_offset + start; 50 51 p = kmap_local_page(bv[i].bv_page); 52 ret = crypto_shash_update(shash, p + off, len); 53 kunmap_local(p); 54 if (ret < 0) 55 return ret; 56 57 maxsize -= len; 58 if (maxsize <= 0) 59 break; 60 start = 0; 61 } 62 63 return 0; 64} 65 66/* 67 * Hash data from a KVEC-type iterator. 68 */ 69static int cifs_shash_kvec(const struct iov_iter *iter, ssize_t maxsize, 70 struct shash_desc *shash) 71{ 72 const struct kvec *kv = iter->kvec; 73 unsigned long start = iter->iov_offset; 74 unsigned int i; 75 int ret; 76 77 for (i = 0; i < iter->nr_segs; i++) { 78 size_t len; 79 80 len = kv[i].iov_len; 81 if (start >= len) { 82 start -= len; 83 continue; 84 } 85 86 len = min_t(size_t, maxsize, len - start); 87 ret = crypto_shash_update(shash, kv[i].iov_base + start, len); 88 if (ret < 0) 89 return ret; 90 maxsize -= len; 91 92 if (maxsize <= 0) 93 break; 94 start = 0; 95 } 96 97 return 0; 98} 99 100/* 101 * Hash data from an XARRAY-type iterator. 102 */ 103static ssize_t cifs_shash_xarray(const struct iov_iter *iter, ssize_t maxsize, 104 struct shash_desc *shash) 105{ 106 struct folio *folios[16], *folio; 107 unsigned int nr, i, j, npages; 108 loff_t start = iter->xarray_start + iter->iov_offset; 109 pgoff_t last, index = start / PAGE_SIZE; 110 ssize_t ret = 0; 111 size_t len, offset, foffset; 112 void *p; 113 114 if (maxsize == 0) 115 return 0; 116 117 last = (start + maxsize - 1) / PAGE_SIZE; 118 do { 119 nr = xa_extract(iter->xarray, (void **)folios, index, last, 120 ARRAY_SIZE(folios), XA_PRESENT); 121 if (nr == 0) 122 return -EIO; 123 124 for (i = 0; i < nr; i++) { 125 folio = folios[i]; 126 npages = folio_nr_pages(folio); 127 foffset = start - folio_pos(folio); 128 offset = foffset % PAGE_SIZE; 129 for (j = foffset / PAGE_SIZE; j < npages; j++) { 130 len = min_t(size_t, maxsize, PAGE_SIZE - offset); 131 p = kmap_local_page(folio_page(folio, j)); 132 ret = crypto_shash_update(shash, p, len); 133 kunmap_local(p); 134 if (ret < 0) 135 return ret; 136 maxsize -= len; 137 if (maxsize <= 0) 138 return 0; 139 start += len; 140 offset = 0; 141 index++; 142 } 143 } 144 } while (nr == ARRAY_SIZE(folios)); 145 return 0; 146} 147 148/* 149 * Pass the data from an iterator into a hash. 150 */ 151static int cifs_shash_iter(const struct iov_iter *iter, size_t maxsize, 152 struct shash_desc *shash) 153{ 154 if (maxsize == 0) 155 return 0; 156 157 switch (iov_iter_type(iter)) { 158 case ITER_BVEC: 159 return cifs_shash_bvec(iter, maxsize, shash); 160 case ITER_KVEC: 161 return cifs_shash_kvec(iter, maxsize, shash); 162 case ITER_XARRAY: 163 return cifs_shash_xarray(iter, maxsize, shash); 164 default: 165 pr_err("cifs_shash_iter(%u) unsupported\n", iov_iter_type(iter)); 166 WARN_ON_ONCE(1); 167 return -EIO; 168 } 169} 170 171int __cifs_calc_signature(struct smb_rqst *rqst, 172 struct TCP_Server_Info *server, char *signature, 173 struct shash_desc *shash) 174{ 175 int i; 176 ssize_t rc; 177 struct kvec *iov = rqst->rq_iov; 178 int n_vec = rqst->rq_nvec; 179 180 /* iov[0] is actual data and not the rfc1002 length for SMB2+ */ 181 if (!is_smb1(server)) { 182 if (iov[0].iov_len <= 4) 183 return -EIO; 184 i = 0; 185 } else { 186 if (n_vec < 2 || iov[0].iov_len != 4) 187 return -EIO; 188 i = 1; /* skip rfc1002 length */ 189 } 190 191 for (; i < n_vec; i++) { 192 if (iov[i].iov_len == 0) 193 continue; 194 if (iov[i].iov_base == NULL) { 195 cifs_dbg(VFS, "null iovec entry\n"); 196 return -EIO; 197 } 198 199 rc = crypto_shash_update(shash, 200 iov[i].iov_base, iov[i].iov_len); 201 if (rc) { 202 cifs_dbg(VFS, "%s: Could not update with payload\n", 203 __func__); 204 return rc; 205 } 206 } 207 208 rc = cifs_shash_iter(&rqst->rq_iter, iov_iter_count(&rqst->rq_iter), shash); 209 if (rc < 0) 210 return rc; 211 212 rc = crypto_shash_final(shash, signature); 213 if (rc) 214 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__); 215 216 return rc; 217} 218 219/* 220 * Calculate and return the CIFS signature based on the mac key and SMB PDU. 221 * The 16 byte signature must be allocated by the caller. Note we only use the 222 * 1st eight bytes and that the smb header signature field on input contains 223 * the sequence number before this function is called. Also, this function 224 * should be called with the server->srv_mutex held. 225 */ 226static int cifs_calc_signature(struct smb_rqst *rqst, 227 struct TCP_Server_Info *server, char *signature) 228{ 229 int rc; 230 231 if (!rqst->rq_iov || !signature || !server) 232 return -EINVAL; 233 234 rc = cifs_alloc_hash("md5", &server->secmech.md5); 235 if (rc) 236 return -1; 237 238 rc = crypto_shash_init(server->secmech.md5); 239 if (rc) { 240 cifs_dbg(VFS, "%s: Could not init md5\n", __func__); 241 return rc; 242 } 243 244 rc = crypto_shash_update(server->secmech.md5, 245 server->session_key.response, server->session_key.len); 246 if (rc) { 247 cifs_dbg(VFS, "%s: Could not update with response\n", __func__); 248 return rc; 249 } 250 251 return __cifs_calc_signature(rqst, server, signature, server->secmech.md5); 252} 253 254/* must be called with server->srv_mutex held */ 255int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server, 256 __u32 *pexpected_response_sequence_number) 257{ 258 int rc = 0; 259 char smb_signature[20]; 260 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; 261 262 if (rqst->rq_iov[0].iov_len != 4 || 263 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) 264 return -EIO; 265 266 if ((cifs_pdu == NULL) || (server == NULL)) 267 return -EINVAL; 268 269 spin_lock(&server->srv_lock); 270 if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) || 271 server->tcpStatus == CifsNeedNegotiate) { 272 spin_unlock(&server->srv_lock); 273 return rc; 274 } 275 spin_unlock(&server->srv_lock); 276 277 if (!server->session_estab) { 278 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8); 279 return rc; 280 } 281 282 cifs_pdu->Signature.Sequence.SequenceNumber = 283 cpu_to_le32(server->sequence_number); 284 cifs_pdu->Signature.Sequence.Reserved = 0; 285 286 *pexpected_response_sequence_number = ++server->sequence_number; 287 ++server->sequence_number; 288 289 rc = cifs_calc_signature(rqst, server, smb_signature); 290 if (rc) 291 memset(cifs_pdu->Signature.SecuritySignature, 0, 8); 292 else 293 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); 294 295 return rc; 296} 297 298int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server, 299 __u32 *pexpected_response_sequence) 300{ 301 struct smb_rqst rqst = { .rq_iov = iov, 302 .rq_nvec = n_vec }; 303 304 return cifs_sign_rqst(&rqst, server, pexpected_response_sequence); 305} 306 307/* must be called with server->srv_mutex held */ 308int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server, 309 __u32 *pexpected_response_sequence_number) 310{ 311 struct kvec iov[2]; 312 313 iov[0].iov_base = cifs_pdu; 314 iov[0].iov_len = 4; 315 iov[1].iov_base = (char *)cifs_pdu + 4; 316 iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length); 317 318 return cifs_sign_smbv(iov, 2, server, 319 pexpected_response_sequence_number); 320} 321 322int cifs_verify_signature(struct smb_rqst *rqst, 323 struct TCP_Server_Info *server, 324 __u32 expected_sequence_number) 325{ 326 unsigned int rc; 327 char server_response_sig[8]; 328 char what_we_think_sig_should_be[20]; 329 struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base; 330 331 if (rqst->rq_iov[0].iov_len != 4 || 332 rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) 333 return -EIO; 334 335 if (cifs_pdu == NULL || server == NULL) 336 return -EINVAL; 337 338 if (!server->session_estab) 339 return 0; 340 341 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { 342 struct smb_com_lock_req *pSMB = 343 (struct smb_com_lock_req *)cifs_pdu; 344 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) 345 return 0; 346 } 347 348 /* BB what if signatures are supposed to be on for session but 349 server does not send one? BB */ 350 351 /* Do not need to verify session setups with signature "BSRSPYL " */ 352 if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0) 353 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", 354 cifs_pdu->Command); 355 356 /* save off the origiginal signature so we can modify the smb and check 357 its signature against what the server sent */ 358 memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8); 359 360 cifs_pdu->Signature.Sequence.SequenceNumber = 361 cpu_to_le32(expected_sequence_number); 362 cifs_pdu->Signature.Sequence.Reserved = 0; 363 364 cifs_server_lock(server); 365 rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be); 366 cifs_server_unlock(server); 367 368 if (rc) 369 return rc; 370 371/* cifs_dump_mem("what we think it should be: ", 372 what_we_think_sig_should_be, 16); */ 373 374 if (memcmp(server_response_sig, what_we_think_sig_should_be, 8)) 375 return -EACCES; 376 else 377 return 0; 378 379} 380 381/* Build a proper attribute value/target info pairs blob. 382 * Fill in netbios and dns domain name and workstation name 383 * and client time (total five av pairs and + one end of fields indicator. 384 * Allocate domain name which gets freed when session struct is deallocated. 385 */ 386static int 387build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp) 388{ 389 unsigned int dlen; 390 unsigned int size = 2 * sizeof(struct ntlmssp2_name); 391 char *defdmname = "WORKGROUP"; 392 unsigned char *blobptr; 393 struct ntlmssp2_name *attrptr; 394 395 if (!ses->domainName) { 396 ses->domainName = kstrdup(defdmname, GFP_KERNEL); 397 if (!ses->domainName) 398 return -ENOMEM; 399 } 400 401 dlen = strlen(ses->domainName); 402 403 /* 404 * The length of this blob is two times the size of a 405 * structure (av pair) which holds name/size 406 * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) + 407 * unicode length of a netbios domain name 408 */ 409 kfree_sensitive(ses->auth_key.response); 410 ses->auth_key.len = size + 2 * dlen; 411 ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL); 412 if (!ses->auth_key.response) { 413 ses->auth_key.len = 0; 414 return -ENOMEM; 415 } 416 417 blobptr = ses->auth_key.response; 418 attrptr = (struct ntlmssp2_name *) blobptr; 419 420 /* 421 * As defined in MS-NTLM 3.3.2, just this av pair field 422 * is sufficient as part of the temp 423 */ 424 attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME); 425 attrptr->length = cpu_to_le16(2 * dlen); 426 blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name); 427 cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp); 428 429 return 0; 430} 431 432/* Server has provided av pairs/target info in the type 2 challenge 433 * packet and we have plucked it and stored within smb session. 434 * We parse that blob here to find netbios domain name to be used 435 * as part of ntlmv2 authentication (in Target String), if not already 436 * specified on the command line. 437 * If this function returns without any error but without fetching 438 * domain name, authentication may fail against some server but 439 * may not fail against other (those who are not very particular 440 * about target string i.e. for some, just user name might suffice. 441 */ 442static int 443find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp) 444{ 445 unsigned int attrsize; 446 unsigned int type; 447 unsigned int onesize = sizeof(struct ntlmssp2_name); 448 unsigned char *blobptr; 449 unsigned char *blobend; 450 struct ntlmssp2_name *attrptr; 451 452 if (!ses->auth_key.len || !ses->auth_key.response) 453 return 0; 454 455 blobptr = ses->auth_key.response; 456 blobend = blobptr + ses->auth_key.len; 457 458 while (blobptr + onesize < blobend) { 459 attrptr = (struct ntlmssp2_name *) blobptr; 460 type = le16_to_cpu(attrptr->type); 461 if (type == NTLMSSP_AV_EOL) 462 break; 463 blobptr += 2; /* advance attr type */ 464 attrsize = le16_to_cpu(attrptr->length); 465 blobptr += 2; /* advance attr size */ 466 if (blobptr + attrsize > blobend) 467 break; 468 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) { 469 if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN) 470 break; 471 if (!ses->domainName) { 472 ses->domainName = 473 kmalloc(attrsize + 1, GFP_KERNEL); 474 if (!ses->domainName) 475 return -ENOMEM; 476 cifs_from_utf16(ses->domainName, 477 (__le16 *)blobptr, attrsize, attrsize, 478 nls_cp, NO_MAP_UNI_RSVD); 479 break; 480 } 481 } 482 blobptr += attrsize; /* advance attr value */ 483 } 484 485 return 0; 486} 487 488/* Server has provided av pairs/target info in the type 2 challenge 489 * packet and we have plucked it and stored within smb session. 490 * We parse that blob here to find the server given timestamp 491 * as part of ntlmv2 authentication (or local current time as 492 * default in case of failure) 493 */ 494static __le64 495find_timestamp(struct cifs_ses *ses) 496{ 497 unsigned int attrsize; 498 unsigned int type; 499 unsigned int onesize = sizeof(struct ntlmssp2_name); 500 unsigned char *blobptr; 501 unsigned char *blobend; 502 struct ntlmssp2_name *attrptr; 503 struct timespec64 ts; 504 505 if (!ses->auth_key.len || !ses->auth_key.response) 506 return 0; 507 508 blobptr = ses->auth_key.response; 509 blobend = blobptr + ses->auth_key.len; 510 511 while (blobptr + onesize < blobend) { 512 attrptr = (struct ntlmssp2_name *) blobptr; 513 type = le16_to_cpu(attrptr->type); 514 if (type == NTLMSSP_AV_EOL) 515 break; 516 blobptr += 2; /* advance attr type */ 517 attrsize = le16_to_cpu(attrptr->length); 518 blobptr += 2; /* advance attr size */ 519 if (blobptr + attrsize > blobend) 520 break; 521 if (type == NTLMSSP_AV_TIMESTAMP) { 522 if (attrsize == sizeof(u64)) 523 return *((__le64 *)blobptr); 524 } 525 blobptr += attrsize; /* advance attr value */ 526 } 527 528 ktime_get_real_ts64(&ts); 529 return cpu_to_le64(cifs_UnixTimeToNT(ts)); 530} 531 532static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash, 533 const struct nls_table *nls_cp) 534{ 535 int rc = 0; 536 int len; 537 char nt_hash[CIFS_NTHASH_SIZE]; 538 __le16 *user; 539 wchar_t *domain; 540 wchar_t *server; 541 542 if (!ses->server->secmech.hmacmd5) { 543 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); 544 return -1; 545 } 546 547 /* calculate md4 hash of password */ 548 E_md4hash(ses->password, nt_hash, nls_cp); 549 550 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm, nt_hash, 551 CIFS_NTHASH_SIZE); 552 if (rc) { 553 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__); 554 return rc; 555 } 556 557 rc = crypto_shash_init(ses->server->secmech.hmacmd5); 558 if (rc) { 559 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); 560 return rc; 561 } 562 563 /* convert ses->user_name to unicode */ 564 len = ses->user_name ? strlen(ses->user_name) : 0; 565 user = kmalloc(2 + (len * 2), GFP_KERNEL); 566 if (user == NULL) { 567 rc = -ENOMEM; 568 return rc; 569 } 570 571 if (len) { 572 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp); 573 UniStrupr(user); 574 } else { 575 *(u16 *)user = 0; 576 } 577 578 rc = crypto_shash_update(ses->server->secmech.hmacmd5, 579 (char *)user, 2 * len); 580 kfree(user); 581 if (rc) { 582 cifs_dbg(VFS, "%s: Could not update with user\n", __func__); 583 return rc; 584 } 585 586 /* convert ses->domainName to unicode and uppercase */ 587 if (ses->domainName) { 588 len = strlen(ses->domainName); 589 590 domain = kmalloc(2 + (len * 2), GFP_KERNEL); 591 if (domain == NULL) { 592 rc = -ENOMEM; 593 return rc; 594 } 595 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len, 596 nls_cp); 597 rc = 598 crypto_shash_update(ses->server->secmech.hmacmd5, 599 (char *)domain, 2 * len); 600 kfree(domain); 601 if (rc) { 602 cifs_dbg(VFS, "%s: Could not update with domain\n", 603 __func__); 604 return rc; 605 } 606 } else { 607 /* We use ses->ip_addr if no domain name available */ 608 len = strlen(ses->ip_addr); 609 610 server = kmalloc(2 + (len * 2), GFP_KERNEL); 611 if (server == NULL) { 612 rc = -ENOMEM; 613 return rc; 614 } 615 len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len, 616 nls_cp); 617 rc = 618 crypto_shash_update(ses->server->secmech.hmacmd5, 619 (char *)server, 2 * len); 620 kfree(server); 621 if (rc) { 622 cifs_dbg(VFS, "%s: Could not update with server\n", 623 __func__); 624 return rc; 625 } 626 } 627 628 rc = crypto_shash_final(ses->server->secmech.hmacmd5, 629 ntlmv2_hash); 630 if (rc) 631 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); 632 633 return rc; 634} 635 636static int 637CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash) 638{ 639 int rc; 640 struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *) 641 (ses->auth_key.response + CIFS_SESS_KEY_SIZE); 642 unsigned int hash_len; 643 644 /* The MD5 hash starts at challenge_key.key */ 645 hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE + 646 offsetof(struct ntlmv2_resp, challenge.key[0])); 647 648 if (!ses->server->secmech.hmacmd5) { 649 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__); 650 return -1; 651 } 652 653 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm, 654 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); 655 if (rc) { 656 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", 657 __func__); 658 return rc; 659 } 660 661 rc = crypto_shash_init(ses->server->secmech.hmacmd5); 662 if (rc) { 663 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); 664 return rc; 665 } 666 667 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) 668 memcpy(ntlmv2->challenge.key, 669 ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); 670 else 671 memcpy(ntlmv2->challenge.key, 672 ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE); 673 rc = crypto_shash_update(ses->server->secmech.hmacmd5, 674 ntlmv2->challenge.key, hash_len); 675 if (rc) { 676 cifs_dbg(VFS, "%s: Could not update with response\n", __func__); 677 return rc; 678 } 679 680 /* Note that the MD5 digest over writes anon.challenge_key.key */ 681 rc = crypto_shash_final(ses->server->secmech.hmacmd5, 682 ntlmv2->ntlmv2_hash); 683 if (rc) 684 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); 685 686 return rc; 687} 688 689int 690setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp) 691{ 692 int rc; 693 int baselen; 694 unsigned int tilen; 695 struct ntlmv2_resp *ntlmv2; 696 char ntlmv2_hash[16]; 697 unsigned char *tiblob = NULL; /* target info blob */ 698 __le64 rsp_timestamp; 699 700 if (nls_cp == NULL) { 701 cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__); 702 return -EINVAL; 703 } 704 705 if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) { 706 if (!ses->domainName) { 707 if (ses->domainAuto) { 708 rc = find_domain_name(ses, nls_cp); 709 if (rc) { 710 cifs_dbg(VFS, "error %d finding domain name\n", 711 rc); 712 goto setup_ntlmv2_rsp_ret; 713 } 714 } else { 715 ses->domainName = kstrdup("", GFP_KERNEL); 716 } 717 } 718 } else { 719 rc = build_avpair_blob(ses, nls_cp); 720 if (rc) { 721 cifs_dbg(VFS, "error %d building av pair blob\n", rc); 722 goto setup_ntlmv2_rsp_ret; 723 } 724 } 725 726 /* Must be within 5 minutes of the server (or in range +/-2h 727 * in case of Mac OS X), so simply carry over server timestamp 728 * (as Windows 7 does) 729 */ 730 rsp_timestamp = find_timestamp(ses); 731 732 baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp); 733 tilen = ses->auth_key.len; 734 tiblob = ses->auth_key.response; 735 736 ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL); 737 if (!ses->auth_key.response) { 738 rc = -ENOMEM; 739 ses->auth_key.len = 0; 740 goto setup_ntlmv2_rsp_ret; 741 } 742 ses->auth_key.len += baselen; 743 744 ntlmv2 = (struct ntlmv2_resp *) 745 (ses->auth_key.response + CIFS_SESS_KEY_SIZE); 746 ntlmv2->blob_signature = cpu_to_le32(0x00000101); 747 ntlmv2->reserved = 0; 748 ntlmv2->time = rsp_timestamp; 749 750 get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal)); 751 ntlmv2->reserved2 = 0; 752 753 memcpy(ses->auth_key.response + baselen, tiblob, tilen); 754 755 cifs_server_lock(ses->server); 756 757 rc = cifs_alloc_hash("hmac(md5)", &ses->server->secmech.hmacmd5); 758 if (rc) { 759 goto unlock; 760 } 761 762 /* calculate ntlmv2_hash */ 763 rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp); 764 if (rc) { 765 cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc); 766 goto unlock; 767 } 768 769 /* calculate first part of the client response (CR1) */ 770 rc = CalcNTLMv2_response(ses, ntlmv2_hash); 771 if (rc) { 772 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc); 773 goto unlock; 774 } 775 776 /* now calculate the session key for NTLMv2 */ 777 rc = crypto_shash_setkey(ses->server->secmech.hmacmd5->tfm, 778 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE); 779 if (rc) { 780 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n", 781 __func__); 782 goto unlock; 783 } 784 785 rc = crypto_shash_init(ses->server->secmech.hmacmd5); 786 if (rc) { 787 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__); 788 goto unlock; 789 } 790 791 rc = crypto_shash_update(ses->server->secmech.hmacmd5, 792 ntlmv2->ntlmv2_hash, 793 CIFS_HMAC_MD5_HASH_SIZE); 794 if (rc) { 795 cifs_dbg(VFS, "%s: Could not update with response\n", __func__); 796 goto unlock; 797 } 798 799 rc = crypto_shash_final(ses->server->secmech.hmacmd5, 800 ses->auth_key.response); 801 if (rc) 802 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); 803 804unlock: 805 cifs_server_unlock(ses->server); 806setup_ntlmv2_rsp_ret: 807 kfree_sensitive(tiblob); 808 809 return rc; 810} 811 812int 813calc_seckey(struct cifs_ses *ses) 814{ 815 unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */ 816 struct arc4_ctx *ctx_arc4; 817 818 if (fips_enabled) 819 return -ENODEV; 820 821 get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE); 822 823 ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL); 824 if (!ctx_arc4) { 825 cifs_dbg(VFS, "Could not allocate arc4 context\n"); 826 return -ENOMEM; 827 } 828 829 cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE); 830 cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key, 831 CIFS_CPHTXT_SIZE); 832 833 /* make secondary_key/nonce as session key */ 834 memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE); 835 /* and make len as that of session key only */ 836 ses->auth_key.len = CIFS_SESS_KEY_SIZE; 837 838 memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE); 839 kfree_sensitive(ctx_arc4); 840 return 0; 841} 842 843void 844cifs_crypto_secmech_release(struct TCP_Server_Info *server) 845{ 846 cifs_free_hash(&server->secmech.aes_cmac); 847 cifs_free_hash(&server->secmech.hmacsha256); 848 cifs_free_hash(&server->secmech.md5); 849 cifs_free_hash(&server->secmech.sha512); 850 cifs_free_hash(&server->secmech.hmacmd5); 851 852 if (server->secmech.enc) { 853 crypto_free_aead(server->secmech.enc); 854 server->secmech.enc = NULL; 855 } 856 857 if (server->secmech.dec) { 858 crypto_free_aead(server->secmech.dec); 859 server->secmech.dec = NULL; 860 } 861} 862