fs/cifs/cifsencrypt.c

   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 "../smbfs_common/arc4.h"
  25 #include <crypto/aead.h>
  26
  27 int __cifs_calc_signature(struct smb_rqst *rqst,
  28                         struct TCP_Server_Info *server, char *signature,
  29                         struct shash_desc *shash)
  30 {
  31         int i;
  32         int rc;
  33         struct kvec *iov = rqst->rq_iov;
  34         int n_vec = rqst->rq_nvec;
  35
  36         /* iov[0] is actual data and not the rfc1002 length for SMB2+ */
  37         if (!is_smb1(server)) {
  38                 if (iov[0].iov_len <= 4)
  39                         return -EIO;
  40                 i = 0;
  41         } else {
  42                 if (n_vec < 2 || iov[0].iov_len != 4)
  43                         return -EIO;
  44                 i = 1; /* skip rfc1002 length */
  45         }
  46
  47         for (; i < n_vec; i++) {
  48                 if (iov[i].iov_len == 0)
  49                         continue;
  50                 if (iov[i].iov_base == NULL) {
  51                         cifs_dbg(VFS, "null iovec entry\n");
  52                         return -EIO;
  53                 }
  54
  55                 rc = crypto_shash_update(shash,
  56                                          iov[i].iov_base, iov[i].iov_len);
  57                 if (rc) {
  58                         cifs_dbg(VFS, "%s: Could not update with payload\n",
  59                                  __func__);
  60                         return rc;
  61                 }
  62         }
  63
  64         /* now hash over the rq_pages array */
  65         for (i = 0; i < rqst->rq_npages; i++) {
  66                 void *kaddr;
  67                 unsigned int len, offset;
  68
  69                 rqst_page_get_length(rqst, i, &len, &offset);
  70
  71                 kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
  72
  73                 rc = crypto_shash_update(shash, kaddr, len);
  74                 if (rc) {
  75                         cifs_dbg(VFS, "%s: Could not update with payload\n",
  76                                  __func__);
  77                         kunmap(rqst->rq_pages[i]);
  78                         return rc;
  79                 }
  80
  81                 kunmap(rqst->rq_pages[i]);
  82         }
  83
  84         rc = crypto_shash_final(shash, signature);
  85         if (rc)
  86                 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
  87
  88         return rc;
  89 }
  90
  91 /*
  92  * Calculate and return the CIFS signature based on the mac key and SMB PDU.
  93  * The 16 byte signature must be allocated by the caller. Note we only use the
  94  * 1st eight bytes and that the smb header signature field on input contains
  95  * the sequence number before this function is called. Also, this function
  96  * should be called with the server->srv_mutex held.
  97  */
  98 static int cifs_calc_signature(struct smb_rqst *rqst,
  99                         struct TCP_Server_Info *server, char *signature)
 100 {
 101         int rc;
 102
 103         if (!rqst->rq_iov || !signature || !server)
 104                 return -EINVAL;
 105
 106         rc = cifs_alloc_hash("md5", &server->secmech.md5,
 107                              &server->secmech.sdescmd5);
 108         if (rc)
 109                 return -1;
 110
 111         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
 112         if (rc) {
 113                 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
 114                 return rc;
 115         }
 116
 117         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
 118                 server->session_key.response, server->session_key.len);
 119         if (rc) {
 120                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 121                 return rc;
 122         }
 123
 124         return __cifs_calc_signature(rqst, server, signature,
 125                                      &server->secmech.sdescmd5->shash);
 126 }
 127
 128 /* must be called with server->srv_mutex held */
 129 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
 130                    __u32 *pexpected_response_sequence_number)
 131 {
 132         int rc = 0;
 133         char smb_signature[20];
 134         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 135
 136         if (rqst->rq_iov[0].iov_len != 4 ||
 137             rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
 138                 return -EIO;
 139
 140         if ((cifs_pdu == NULL) || (server == NULL))
 141                 return -EINVAL;
 142
 143         spin_lock(&server->srv_lock);
 144         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 145             server->tcpStatus == CifsNeedNegotiate) {
 146                 spin_unlock(&server->srv_lock);
 147                 return rc;
 148         }
 149         spin_unlock(&server->srv_lock);
 150
 151         if (!server->session_estab) {
 152                 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 153                 return rc;
 154         }
 155
 156         cifs_pdu->Signature.Sequence.SequenceNumber =
 157                                 cpu_to_le32(server->sequence_number);
 158         cifs_pdu->Signature.Sequence.Reserved = 0;
 159
 160         *pexpected_response_sequence_number = ++server->sequence_number;
 161         ++server->sequence_number;
 162
 163         rc = cifs_calc_signature(rqst, server, smb_signature);
 164         if (rc)
 165                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 166         else
 167                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 168
 169         return rc;
 170 }
 171
 172 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 173                    __u32 *pexpected_response_sequence)
 174 {
 175         struct smb_rqst rqst = { .rq_iov = iov,
 176                                  .rq_nvec = n_vec };
 177
 178         return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
 179 }
 180
 181 /* must be called with server->srv_mutex held */
 182 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 183                   __u32 *pexpected_response_sequence_number)
 184 {
 185         struct kvec iov[2];
 186
 187         iov[0].iov_base = cifs_pdu;
 188         iov[0].iov_len = 4;
 189         iov[1].iov_base = (char *)cifs_pdu + 4;
 190         iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
 191
 192         return cifs_sign_smbv(iov, 2, server,
 193                               pexpected_response_sequence_number);
 194 }
 195
 196 int cifs_verify_signature(struct smb_rqst *rqst,
 197                           struct TCP_Server_Info *server,
 198                           __u32 expected_sequence_number)
 199 {
 200         unsigned int rc;
 201         char server_response_sig[8];
 202         char what_we_think_sig_should_be[20];
 203         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 204
 205         if (rqst->rq_iov[0].iov_len != 4 ||
 206             rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
 207                 return -EIO;
 208
 209         if (cifs_pdu == NULL || server == NULL)
 210                 return -EINVAL;
 211
 212         if (!server->session_estab)
 213                 return 0;
 214
 215         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 216                 struct smb_com_lock_req *pSMB =
 217                         (struct smb_com_lock_req *)cifs_pdu;
 218                 if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 219                         return 0;
 220         }
 221
 222         /* BB what if signatures are supposed to be on for session but
 223            server does not send one? BB */
 224
 225         /* Do not need to verify session setups with signature "BSRSPYL "  */
 226         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 227                 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
 228                          cifs_pdu->Command);
 229
 230         /* save off the origiginal signature so we can modify the smb and check
 231                 its signature against what the server sent */
 232         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 233
 234         cifs_pdu->Signature.Sequence.SequenceNumber =
 235                                         cpu_to_le32(expected_sequence_number);
 236         cifs_pdu->Signature.Sequence.Reserved = 0;
 237
 238         cifs_server_lock(server);
 239         rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
 240         cifs_server_unlock(server);
 241
 242         if (rc)
 243                 return rc;
 244
 245 /*      cifs_dump_mem("what we think it should be: ",
 246                       what_we_think_sig_should_be, 16); */
 247
 248         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 249                 return -EACCES;
 250         else
 251                 return 0;
 252
 253 }
 254
 255 /* Build a proper attribute value/target info pairs blob.
 256  * Fill in netbios and dns domain name and workstation name
 257  * and client time (total five av pairs and + one end of fields indicator.
 258  * Allocate domain name which gets freed when session struct is deallocated.
 259  */
 260 static int
 261 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 262 {
 263         unsigned int dlen;
 264         unsigned int size = 2 * sizeof(struct ntlmssp2_name);
 265         char *defdmname = "WORKGROUP";
 266         unsigned char *blobptr;
 267         struct ntlmssp2_name *attrptr;
 268
 269         if (!ses->domainName) {
 270                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 271                 if (!ses->domainName)
 272                         return -ENOMEM;
 273         }
 274
 275         dlen = strlen(ses->domainName);
 276
 277         /*
 278          * The length of this blob is two times the size of a
 279          * structure (av pair) which holds name/size
 280          * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
 281          * unicode length of a netbios domain name
 282          */
 283         ses->auth_key.len = size + 2 * dlen;
 284         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 285         if (!ses->auth_key.response) {
 286                 ses->auth_key.len = 0;
 287                 return -ENOMEM;
 288         }
 289
 290         blobptr = ses->auth_key.response;
 291         attrptr = (struct ntlmssp2_name *) blobptr;
 292
 293         /*
 294          * As defined in MS-NTLM 3.3.2, just this av pair field
 295          * is sufficient as part of the temp
 296          */
 297         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 298         attrptr->length = cpu_to_le16(2 * dlen);
 299         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 300         cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 301
 302         return 0;
 303 }
 304
 305 /* Server has provided av pairs/target info in the type 2 challenge
 306  * packet and we have plucked it and stored within smb session.
 307  * We parse that blob here to find netbios domain name to be used
 308  * as part of ntlmv2 authentication (in Target String), if not already
 309  * specified on the command line.
 310  * If this function returns without any error but without fetching
 311  * domain name, authentication may fail against some server but
 312  * may not fail against other (those who are not very particular
 313  * about target string i.e. for some, just user name might suffice.
 314  */
 315 static int
 316 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 317 {
 318         unsigned int attrsize;
 319         unsigned int type;
 320         unsigned int onesize = sizeof(struct ntlmssp2_name);
 321         unsigned char *blobptr;
 322         unsigned char *blobend;
 323         struct ntlmssp2_name *attrptr;
 324
 325         if (!ses->auth_key.len || !ses->auth_key.response)
 326                 return 0;
 327
 328         blobptr = ses->auth_key.response;
 329         blobend = blobptr + ses->auth_key.len;
 330
 331         while (blobptr + onesize < blobend) {
 332                 attrptr = (struct ntlmssp2_name *) blobptr;
 333                 type = le16_to_cpu(attrptr->type);
 334                 if (type == NTLMSSP_AV_EOL)
 335                         break;
 336                 blobptr += 2; /* advance attr type */
 337                 attrsize = le16_to_cpu(attrptr->length);
 338                 blobptr += 2; /* advance attr size */
 339                 if (blobptr + attrsize > blobend)
 340                         break;
 341                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 342                         if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
 343                                 break;
 344                         if (!ses->domainName) {
 345                                 ses->domainName =
 346                                         kmalloc(attrsize + 1, GFP_KERNEL);
 347                                 if (!ses->domainName)
 348                                                 return -ENOMEM;
 349                                 cifs_from_utf16(ses->domainName,
 350                                         (__le16 *)blobptr, attrsize, attrsize,
 351                                         nls_cp, NO_MAP_UNI_RSVD);
 352                                 break;
 353                         }
 354                 }
 355                 blobptr += attrsize; /* advance attr  value */
 356         }
 357
 358         return 0;
 359 }
 360
 361 /* Server has provided av pairs/target info in the type 2 challenge
 362  * packet and we have plucked it and stored within smb session.
 363  * We parse that blob here to find the server given timestamp
 364  * as part of ntlmv2 authentication (or local current time as
 365  * default in case of failure)
 366  */
 367 static __le64
 368 find_timestamp(struct cifs_ses *ses)
 369 {
 370         unsigned int attrsize;
 371         unsigned int type;
 372         unsigned int onesize = sizeof(struct ntlmssp2_name);
 373         unsigned char *blobptr;
 374         unsigned char *blobend;
 375         struct ntlmssp2_name *attrptr;
 376         struct timespec64 ts;
 377
 378         if (!ses->auth_key.len || !ses->auth_key.response)
 379                 return 0;
 380
 381         blobptr = ses->auth_key.response;
 382         blobend = blobptr + ses->auth_key.len;
 383
 384         while (blobptr + onesize < blobend) {
 385                 attrptr = (struct ntlmssp2_name *) blobptr;
 386                 type = le16_to_cpu(attrptr->type);
 387                 if (type == NTLMSSP_AV_EOL)
 388                         break;
 389                 blobptr += 2; /* advance attr type */
 390                 attrsize = le16_to_cpu(attrptr->length);
 391                 blobptr += 2; /* advance attr size */
 392                 if (blobptr + attrsize > blobend)
 393                         break;
 394                 if (type == NTLMSSP_AV_TIMESTAMP) {
 395                         if (attrsize == sizeof(u64))
 396                                 return *((__le64 *)blobptr);
 397                 }
 398                 blobptr += attrsize; /* advance attr value */
 399         }
 400
 401         ktime_get_real_ts64(&ts);
 402         return cpu_to_le64(cifs_UnixTimeToNT(ts));
 403 }
 404
 405 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 406                             const struct nls_table *nls_cp)
 407 {
 408         int rc = 0;
 409         int len;
 410         char nt_hash[CIFS_NTHASH_SIZE];
 411         __le16 *user;
 412         wchar_t *domain;
 413         wchar_t *server;
 414
 415         if (!ses->server->secmech.sdeschmacmd5) {
 416                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 417                 return -1;
 418         }
 419
 420         /* calculate md4 hash of password */
 421         E_md4hash(ses->password, nt_hash, nls_cp);
 422
 423         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 424                                 CIFS_NTHASH_SIZE);
 425         if (rc) {
 426                 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
 427                 return rc;
 428         }
 429
 430         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 431         if (rc) {
 432                 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
 433                 return rc;
 434         }
 435
 436         /* convert ses->user_name to unicode */
 437         len = ses->user_name ? strlen(ses->user_name) : 0;
 438         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 439         if (user == NULL) {
 440                 rc = -ENOMEM;
 441                 return rc;
 442         }
 443
 444         if (len) {
 445                 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
 446                 UniStrupr(user);
 447         } else {
 448                 memset(user, '\0', 2);
 449         }
 450
 451         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 452                                 (char *)user, 2 * len);
 453         kfree(user);
 454         if (rc) {
 455                 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
 456                 return rc;
 457         }
 458
 459         /* convert ses->domainName to unicode and uppercase */
 460         if (ses->domainName) {
 461                 len = strlen(ses->domainName);
 462
 463                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 464                 if (domain == NULL) {
 465                         rc = -ENOMEM;
 466                         return rc;
 467                 }
 468                 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
 469                                       nls_cp);
 470                 rc =
 471                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 472                                         (char *)domain, 2 * len);
 473                 kfree(domain);
 474                 if (rc) {
 475                         cifs_dbg(VFS, "%s: Could not update with domain\n",
 476                                  __func__);
 477                         return rc;
 478                 }
 479         } else {
 480                 /* We use ses->ip_addr if no domain name available */
 481                 len = strlen(ses->ip_addr);
 482
 483                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 484                 if (server == NULL) {
 485                         rc = -ENOMEM;
 486                         return rc;
 487                 }
 488                 len = cifs_strtoUTF16((__le16 *)server, ses->ip_addr, len,
 489                                         nls_cp);
 490                 rc =
 491                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 492                                         (char *)server, 2 * len);
 493                 kfree(server);
 494                 if (rc) {
 495                         cifs_dbg(VFS, "%s: Could not update with server\n",
 496                                  __func__);
 497                         return rc;
 498                 }
 499         }
 500
 501         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 502                                         ntlmv2_hash);
 503         if (rc)
 504                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 505
 506         return rc;
 507 }
 508
 509 static int
 510 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 511 {
 512         int rc;
 513         struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
 514             (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 515         unsigned int hash_len;
 516
 517         /* The MD5 hash starts at challenge_key.key */
 518         hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
 519                 offsetof(struct ntlmv2_resp, challenge.key[0]));
 520
 521         if (!ses->server->secmech.sdeschmacmd5) {
 522                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 523                 return -1;
 524         }
 525
 526         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 527                                  ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 528         if (rc) {
 529                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 530                          __func__);
 531                 return rc;
 532         }
 533
 534         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 535         if (rc) {
 536                 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
 537                 return rc;
 538         }
 539
 540         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
 541                 memcpy(ntlmv2->challenge.key,
 542                        ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 543         else
 544                 memcpy(ntlmv2->challenge.key,
 545                        ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 546         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 547                                  ntlmv2->challenge.key, hash_len);
 548         if (rc) {
 549                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 550                 return rc;
 551         }
 552
 553         /* Note that the MD5 digest over writes anon.challenge_key.key */
 554         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 555                                 ntlmv2->ntlmv2_hash);
 556         if (rc)
 557                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 558
 559         return rc;
 560 }
 561
 562 int
 563 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 564 {
 565         int rc;
 566         int baselen;
 567         unsigned int tilen;
 568         struct ntlmv2_resp *ntlmv2;
 569         char ntlmv2_hash[16];
 570         unsigned char *tiblob = NULL; /* target info blob */
 571         __le64 rsp_timestamp;
 572
 573         if (nls_cp == NULL) {
 574                 cifs_dbg(VFS, "%s called with nls_cp==NULL\n", __func__);
 575                 return -EINVAL;
 576         }
 577
 578         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
 579                 if (!ses->domainName) {
 580                         if (ses->domainAuto) {
 581                                 rc = find_domain_name(ses, nls_cp);
 582                                 if (rc) {
 583                                         cifs_dbg(VFS, "error %d finding domain name\n",
 584                                                  rc);
 585                                         goto setup_ntlmv2_rsp_ret;
 586                                 }
 587                         } else {
 588                                 ses->domainName = kstrdup("", GFP_KERNEL);
 589                         }
 590                 }
 591         } else {
 592                 rc = build_avpair_blob(ses, nls_cp);
 593                 if (rc) {
 594                         cifs_dbg(VFS, "error %d building av pair blob\n", rc);
 595                         goto setup_ntlmv2_rsp_ret;
 596                 }
 597         }
 598
 599         /* Must be within 5 minutes of the server (or in range +/-2h
 600          * in case of Mac OS X), so simply carry over server timestamp
 601          * (as Windows 7 does)
 602          */
 603         rsp_timestamp = find_timestamp(ses);
 604
 605         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 606         tilen = ses->auth_key.len;
 607         tiblob = ses->auth_key.response;
 608
 609         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 610         if (!ses->auth_key.response) {
 611                 rc = -ENOMEM;
 612                 ses->auth_key.len = 0;
 613                 goto setup_ntlmv2_rsp_ret;
 614         }
 615         ses->auth_key.len += baselen;
 616
 617         ntlmv2 = (struct ntlmv2_resp *)
 618                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 619         ntlmv2->blob_signature = cpu_to_le32(0x00000101);
 620         ntlmv2->reserved = 0;
 621         ntlmv2->time = rsp_timestamp;
 622
 623         get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
 624         ntlmv2->reserved2 = 0;
 625
 626         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 627
 628         cifs_server_lock(ses->server);
 629
 630         rc = cifs_alloc_hash("hmac(md5)",
 631                              &ses->server->secmech.hmacmd5,
 632                              &ses->server->secmech.sdeschmacmd5);
 633         if (rc) {
 634                 goto unlock;
 635         }
 636
 637         /* calculate ntlmv2_hash */
 638         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 639         if (rc) {
 640                 cifs_dbg(VFS, "Could not get v2 hash rc %d\n", rc);
 641                 goto unlock;
 642         }
 643
 644         /* calculate first part of the client response (CR1) */
 645         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 646         if (rc) {
 647                 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
 648                 goto unlock;
 649         }
 650
 651         /* now calculate the session key for NTLMv2 */
 652         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 653                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 654         if (rc) {
 655                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 656                          __func__);
 657                 goto unlock;
 658         }
 659
 660         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 661         if (rc) {
 662                 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
 663                 goto unlock;
 664         }
 665
 666         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 667                 ntlmv2->ntlmv2_hash,
 668                 CIFS_HMAC_MD5_HASH_SIZE);
 669         if (rc) {
 670                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 671                 goto unlock;
 672         }
 673
 674         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 675                 ses->auth_key.response);
 676         if (rc)
 677                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 678
 679 unlock:
 680         cifs_server_unlock(ses->server);
 681 setup_ntlmv2_rsp_ret:
 682         kfree(tiblob);
 683
 684         return rc;
 685 }
 686
 687 int
 688 calc_seckey(struct cifs_ses *ses)
 689 {
 690         unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 691         struct arc4_ctx *ctx_arc4;
 692
 693         if (fips_enabled)
 694                 return -ENODEV;
 695
 696         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 697
 698         ctx_arc4 = kmalloc(sizeof(*ctx_arc4), GFP_KERNEL);
 699         if (!ctx_arc4) {
 700                 cifs_dbg(VFS, "Could not allocate arc4 context\n");
 701                 return -ENOMEM;
 702         }
 703
 704         cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
 705         cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
 706                         CIFS_CPHTXT_SIZE);
 707
 708         /* make secondary_key/nonce as session key */
 709         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 710         /* and make len as that of session key only */
 711         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 712
 713         memzero_explicit(sec_key, CIFS_SESS_KEY_SIZE);
 714         kfree_sensitive(ctx_arc4);
 715         return 0;
 716 }
 717
 718 void
 719 cifs_crypto_secmech_release(struct TCP_Server_Info *server)
 720 {
 721         if (server->secmech.cmacaes) {
 722                 crypto_free_shash(server->secmech.cmacaes);
 723                 server->secmech.cmacaes = NULL;
 724         }
 725
 726         if (server->secmech.hmacsha256) {
 727                 crypto_free_shash(server->secmech.hmacsha256);
 728                 server->secmech.hmacsha256 = NULL;
 729         }
 730
 731         if (server->secmech.md5) {
 732                 crypto_free_shash(server->secmech.md5);
 733                 server->secmech.md5 = NULL;
 734         }
 735
 736         if (server->secmech.sha512) {
 737                 crypto_free_shash(server->secmech.sha512);
 738                 server->secmech.sha512 = NULL;
 739         }
 740
 741         if (server->secmech.hmacmd5) {
 742                 crypto_free_shash(server->secmech.hmacmd5);
 743                 server->secmech.hmacmd5 = NULL;
 744         }
 745
 746         if (server->secmech.ccmaesencrypt) {
 747                 crypto_free_aead(server->secmech.ccmaesencrypt);
 748                 server->secmech.ccmaesencrypt = NULL;
 749         }
 750
 751         if (server->secmech.ccmaesdecrypt) {
 752                 crypto_free_aead(server->secmech.ccmaesdecrypt);
 753                 server->secmech.ccmaesdecrypt = NULL;
 754         }
 755
 756         kfree(server->secmech.sdesccmacaes);
 757         server->secmech.sdesccmacaes = NULL;
 758         kfree(server->secmech.sdeschmacsha256);
 759         server->secmech.sdeschmacsha256 = NULL;
 760         kfree(server->secmech.sdeschmacmd5);
 761         server->secmech.sdeschmacmd5 = NULL;
 762         kfree(server->secmech.sdescmd5);
 763         server->secmech.sdescmd5 = NULL;
 764         kfree(server->secmech.sdescsha512);
 765         server->secmech.sdescsha512 = NULL;
 766 }