fs/cifs/cifsencrypt.c

   1 /*
   2  *   fs/cifs/cifsencrypt.c
   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  *   This library is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU Lesser General Public License as published
  12  *   by the Free Software Foundation; either version 2.1 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This library is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  18  *   the GNU Lesser General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU Lesser General Public License
  21  *   along with this library; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include "cifspdu.h"
  28 #include "cifsglob.h"
  29 #include "cifs_debug.h"
  30 #include "cifs_unicode.h"
  31 #include "cifsproto.h"
  32 #include "ntlmssp.h"
  33 #include <linux/ctype.h>
  34 #include <linux/random.h>
  35 #include <linux/highmem.h>
  36 #include <crypto/skcipher.h>
  37 #include <crypto/aead.h>
  38
  39 int __cifs_calc_signature(struct smb_rqst *rqst,
  40                         struct TCP_Server_Info *server, char *signature,
  41                         struct shash_desc *shash)
  42 {
  43         int i;
  44         int rc;
  45         struct kvec *iov = rqst->rq_iov;
  46         int n_vec = rqst->rq_nvec;
  47
  48         if (n_vec < 2 || iov[0].iov_len != 4)
  49                 return -EIO;
  50
  51         for (i = 1; i < n_vec; i++) {
  52                 if (iov[i].iov_len == 0)
  53                         continue;
  54                 if (iov[i].iov_base == NULL) {
  55                         cifs_dbg(VFS, "null iovec entry\n");
  56                         return -EIO;
  57                 }
  58                 if (i == 1 && iov[1].iov_len <= 4)
  59                         break; /* nothing to sign or corrupt header */
  60                 rc = crypto_shash_update(shash,
  61                                          iov[i].iov_base, iov[i].iov_len);
  62                 if (rc) {
  63                         cifs_dbg(VFS, "%s: Could not update with payload\n",
  64                                  __func__);
  65                         return rc;
  66                 }
  67         }
  68
  69         /* now hash over the rq_pages array */
  70         for (i = 0; i < rqst->rq_npages; i++) {
  71                 void *kaddr = kmap(rqst->rq_pages[i]);
  72                 size_t len = rqst->rq_pagesz;
  73
  74                 if (i == rqst->rq_npages - 1)
  75                         len = rqst->rq_tailsz;
  76
  77                 crypto_shash_update(shash, kaddr, len);
  78
  79                 kunmap(rqst->rq_pages[i]);
  80         }
  81
  82         rc = crypto_shash_final(shash, signature);
  83         if (rc)
  84                 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
  85
  86         return rc;
  87 }
  88
  89 /*
  90  * Calculate and return the CIFS signature based on the mac key and SMB PDU.
  91  * The 16 byte signature must be allocated by the caller. Note we only use the
  92  * 1st eight bytes and that the smb header signature field on input contains
  93  * the sequence number before this function is called. Also, this function
  94  * should be called with the server->srv_mutex held.
  95  */
  96 static int cifs_calc_signature(struct smb_rqst *rqst,
  97                         struct TCP_Server_Info *server, char *signature)
  98 {
  99         int rc;
 100
 101         if (!rqst->rq_iov || !signature || !server)
 102                 return -EINVAL;
 103
 104         rc = cifs_alloc_hash("md5", &server->secmech.md5,
 105                              &server->secmech.sdescmd5);
 106         if (rc)
 107                 return -1;
 108
 109         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
 110         if (rc) {
 111                 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
 112                 return rc;
 113         }
 114
 115         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
 116                 server->session_key.response, server->session_key.len);
 117         if (rc) {
 118                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 119                 return rc;
 120         }
 121
 122         return __cifs_calc_signature(rqst, server, signature,
 123                                      &server->secmech.sdescmd5->shash);
 124 }
 125
 126 /* must be called with server->srv_mutex held */
 127 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
 128                    __u32 *pexpected_response_sequence_number)
 129 {
 130         int rc = 0;
 131         char smb_signature[20];
 132         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 133
 134         if (rqst->rq_iov[0].iov_len != 4 ||
 135             rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
 136                 return -EIO;
 137
 138         if ((cifs_pdu == NULL) || (server == NULL))
 139                 return -EINVAL;
 140
 141         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 142             server->tcpStatus == CifsNeedNegotiate)
 143                 return rc;
 144
 145         if (!server->session_estab) {
 146                 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 147                 return rc;
 148         }
 149
 150         cifs_pdu->Signature.Sequence.SequenceNumber =
 151                                 cpu_to_le32(server->sequence_number);
 152         cifs_pdu->Signature.Sequence.Reserved = 0;
 153
 154         *pexpected_response_sequence_number = ++server->sequence_number;
 155         ++server->sequence_number;
 156
 157         rc = cifs_calc_signature(rqst, server, smb_signature);
 158         if (rc)
 159                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 160         else
 161                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 162
 163         return rc;
 164 }
 165
 166 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 167                    __u32 *pexpected_response_sequence)
 168 {
 169         struct smb_rqst rqst = { .rq_iov = iov,
 170                                  .rq_nvec = n_vec };
 171
 172         return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
 173 }
 174
 175 /* must be called with server->srv_mutex held */
 176 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 177                   __u32 *pexpected_response_sequence_number)
 178 {
 179         struct kvec iov[2];
 180
 181         iov[0].iov_base = cifs_pdu;
 182         iov[0].iov_len = 4;
 183         iov[1].iov_base = (char *)cifs_pdu + 4;
 184         iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
 185
 186         return cifs_sign_smbv(iov, 2, server,
 187                               pexpected_response_sequence_number);
 188 }
 189
 190 int cifs_verify_signature(struct smb_rqst *rqst,
 191                           struct TCP_Server_Info *server,
 192                           __u32 expected_sequence_number)
 193 {
 194         unsigned int rc;
 195         char server_response_sig[8];
 196         char what_we_think_sig_should_be[20];
 197         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 198
 199         if (rqst->rq_iov[0].iov_len != 4 ||
 200             rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
 201                 return -EIO;
 202
 203         if (cifs_pdu == NULL || server == NULL)
 204                 return -EINVAL;
 205
 206         if (!server->session_estab)
 207                 return 0;
 208
 209         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 210                 struct smb_com_lock_req *pSMB =
 211                         (struct smb_com_lock_req *)cifs_pdu;
 212             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 213                         return 0;
 214         }
 215
 216         /* BB what if signatures are supposed to be on for session but
 217            server does not send one? BB */
 218
 219         /* Do not need to verify session setups with signature "BSRSPYL "  */
 220         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 221                 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
 222                          cifs_pdu->Command);
 223
 224         /* save off the origiginal signature so we can modify the smb and check
 225                 its signature against what the server sent */
 226         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 227
 228         cifs_pdu->Signature.Sequence.SequenceNumber =
 229                                         cpu_to_le32(expected_sequence_number);
 230         cifs_pdu->Signature.Sequence.Reserved = 0;
 231
 232         mutex_lock(&server->srv_mutex);
 233         rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
 234         mutex_unlock(&server->srv_mutex);
 235
 236         if (rc)
 237                 return rc;
 238
 239 /*      cifs_dump_mem("what we think it should be: ",
 240                       what_we_think_sig_should_be, 16); */
 241
 242         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 243                 return -EACCES;
 244         else
 245                 return 0;
 246
 247 }
 248
 249 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 250 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
 251 {
 252         int rc = 0;
 253         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 254         char temp_key[CIFS_SESS_KEY_SIZE];
 255
 256         if (!ses)
 257                 return -EINVAL;
 258
 259         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 260         if (!ses->auth_key.response)
 261                 return -ENOMEM;
 262
 263         ses->auth_key.len = temp_len;
 264
 265         rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 266                         ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
 267         if (rc) {
 268                 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
 269                          __func__, rc);
 270                 return rc;
 271         }
 272
 273         rc = E_md4hash(ses->password, temp_key, nls_cp);
 274         if (rc) {
 275                 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
 276                          __func__, rc);
 277                 return rc;
 278         }
 279
 280         rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 281         if (rc)
 282                 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
 283                          __func__, rc);
 284
 285         return rc;
 286 }
 287
 288 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 289 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 290                         char *lnm_session_key)
 291 {
 292         int i;
 293         int rc;
 294         char password_with_pad[CIFS_ENCPWD_SIZE] = {0};
 295
 296         if (password)
 297                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 298
 299         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 300                 memcpy(lnm_session_key, password_with_pad,
 301                         CIFS_ENCPWD_SIZE);
 302                 return 0;
 303         }
 304
 305         /* calculate old style session key */
 306         /* calling toupper is less broken than repeatedly
 307         calling nls_toupper would be since that will never
 308         work for UTF8, but neither handles multibyte code pages
 309         but the only alternative would be converting to UCS-16 (Unicode)
 310         (using a routine something like UniStrupr) then
 311         uppercasing and then converting back from Unicode - which
 312         would only worth doing it if we knew it were utf8. Basically
 313         utf8 and other multibyte codepages each need their own strupper
 314         function since a byte at a time will ont work. */
 315
 316         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 317                 password_with_pad[i] = toupper(password_with_pad[i]);
 318
 319         rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 320
 321         return rc;
 322 }
 323 #endif /* CIFS_WEAK_PW_HASH */
 324
 325 /* Build a proper attribute value/target info pairs blob.
 326  * Fill in netbios and dns domain name and workstation name
 327  * and client time (total five av pairs and + one end of fields indicator.
 328  * Allocate domain name which gets freed when session struct is deallocated.
 329  */
 330 static int
 331 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 332 {
 333         unsigned int dlen;
 334         unsigned int size = 2 * sizeof(struct ntlmssp2_name);
 335         char *defdmname = "WORKGROUP";
 336         unsigned char *blobptr;
 337         struct ntlmssp2_name *attrptr;
 338
 339         if (!ses->domainName) {
 340                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 341                 if (!ses->domainName)
 342                         return -ENOMEM;
 343         }
 344
 345         dlen = strlen(ses->domainName);
 346
 347         /*
 348          * The length of this blob is two times the size of a
 349          * structure (av pair) which holds name/size
 350          * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
 351          * unicode length of a netbios domain name
 352          */
 353         ses->auth_key.len = size + 2 * dlen;
 354         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 355         if (!ses->auth_key.response) {
 356                 ses->auth_key.len = 0;
 357                 return -ENOMEM;
 358         }
 359
 360         blobptr = ses->auth_key.response;
 361         attrptr = (struct ntlmssp2_name *) blobptr;
 362
 363         /*
 364          * As defined in MS-NTLM 3.3.2, just this av pair field
 365          * is sufficient as part of the temp
 366          */
 367         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 368         attrptr->length = cpu_to_le16(2 * dlen);
 369         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 370         cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 371
 372         return 0;
 373 }
 374
 375 /* Server has provided av pairs/target info in the type 2 challenge
 376  * packet and we have plucked it and stored within smb session.
 377  * We parse that blob here to find netbios domain name to be used
 378  * as part of ntlmv2 authentication (in Target String), if not already
 379  * specified on the command line.
 380  * If this function returns without any error but without fetching
 381  * domain name, authentication may fail against some server but
 382  * may not fail against other (those who are not very particular
 383  * about target string i.e. for some, just user name might suffice.
 384  */
 385 static int
 386 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 387 {
 388         unsigned int attrsize;
 389         unsigned int type;
 390         unsigned int onesize = sizeof(struct ntlmssp2_name);
 391         unsigned char *blobptr;
 392         unsigned char *blobend;
 393         struct ntlmssp2_name *attrptr;
 394
 395         if (!ses->auth_key.len || !ses->auth_key.response)
 396                 return 0;
 397
 398         blobptr = ses->auth_key.response;
 399         blobend = blobptr + ses->auth_key.len;
 400
 401         while (blobptr + onesize < blobend) {
 402                 attrptr = (struct ntlmssp2_name *) blobptr;
 403                 type = le16_to_cpu(attrptr->type);
 404                 if (type == NTLMSSP_AV_EOL)
 405                         break;
 406                 blobptr += 2; /* advance attr type */
 407                 attrsize = le16_to_cpu(attrptr->length);
 408                 blobptr += 2; /* advance attr size */
 409                 if (blobptr + attrsize > blobend)
 410                         break;
 411                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 412                         if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
 413                                 break;
 414                         if (!ses->domainName) {
 415                                 ses->domainName =
 416                                         kmalloc(attrsize + 1, GFP_KERNEL);
 417                                 if (!ses->domainName)
 418                                                 return -ENOMEM;
 419                                 cifs_from_utf16(ses->domainName,
 420                                         (__le16 *)blobptr, attrsize, attrsize,
 421                                         nls_cp, NO_MAP_UNI_RSVD);
 422                                 break;
 423                         }
 424                 }
 425                 blobptr += attrsize; /* advance attr  value */
 426         }
 427
 428         return 0;
 429 }
 430
 431 /* Server has provided av pairs/target info in the type 2 challenge
 432  * packet and we have plucked it and stored within smb session.
 433  * We parse that blob here to find the server given timestamp
 434  * as part of ntlmv2 authentication (or local current time as
 435  * default in case of failure)
 436  */
 437 static __le64
 438 find_timestamp(struct cifs_ses *ses)
 439 {
 440         unsigned int attrsize;
 441         unsigned int type;
 442         unsigned int onesize = sizeof(struct ntlmssp2_name);
 443         unsigned char *blobptr;
 444         unsigned char *blobend;
 445         struct ntlmssp2_name *attrptr;
 446         struct timespec ts;
 447
 448         if (!ses->auth_key.len || !ses->auth_key.response)
 449                 return 0;
 450
 451         blobptr = ses->auth_key.response;
 452         blobend = blobptr + ses->auth_key.len;
 453
 454         while (blobptr + onesize < blobend) {
 455                 attrptr = (struct ntlmssp2_name *) blobptr;
 456                 type = le16_to_cpu(attrptr->type);
 457                 if (type == NTLMSSP_AV_EOL)
 458                         break;
 459                 blobptr += 2; /* advance attr type */
 460                 attrsize = le16_to_cpu(attrptr->length);
 461                 blobptr += 2; /* advance attr size */
 462                 if (blobptr + attrsize > blobend)
 463                         break;
 464                 if (type == NTLMSSP_AV_TIMESTAMP) {
 465                         if (attrsize == sizeof(u64))
 466                                 return *((__le64 *)blobptr);
 467                 }
 468                 blobptr += attrsize; /* advance attr value */
 469         }
 470
 471         ktime_get_real_ts(&ts);
 472         return cpu_to_le64(cifs_UnixTimeToNT(ts));
 473 }
 474
 475 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 476                             const struct nls_table *nls_cp)
 477 {
 478         int rc = 0;
 479         int len;
 480         char nt_hash[CIFS_NTHASH_SIZE];
 481         __le16 *user;
 482         wchar_t *domain;
 483         wchar_t *server;
 484
 485         if (!ses->server->secmech.sdeschmacmd5) {
 486                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 487                 return -1;
 488         }
 489
 490         /* calculate md4 hash of password */
 491         E_md4hash(ses->password, nt_hash, nls_cp);
 492
 493         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 494                                 CIFS_NTHASH_SIZE);
 495         if (rc) {
 496                 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
 497                 return rc;
 498         }
 499
 500         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 501         if (rc) {
 502                 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
 503                 return rc;
 504         }
 505
 506         /* convert ses->user_name to unicode */
 507         len = ses->user_name ? strlen(ses->user_name) : 0;
 508         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 509         if (user == NULL) {
 510                 rc = -ENOMEM;
 511                 return rc;
 512         }
 513
 514         if (len) {
 515                 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
 516                 UniStrupr(user);
 517         } else {
 518                 memset(user, '\0', 2);
 519         }
 520
 521         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 522                                 (char *)user, 2 * len);
 523         kfree(user);
 524         if (rc) {
 525                 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
 526                 return rc;
 527         }
 528
 529         /* convert ses->domainName to unicode and uppercase */
 530         if (ses->domainName) {
 531                 len = strlen(ses->domainName);
 532
 533                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 534                 if (domain == NULL) {
 535                         rc = -ENOMEM;
 536                         return rc;
 537                 }
 538                 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
 539                                       nls_cp);
 540                 rc =
 541                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 542                                         (char *)domain, 2 * len);
 543                 kfree(domain);
 544                 if (rc) {
 545                         cifs_dbg(VFS, "%s: Could not update with domain\n",
 546                                  __func__);
 547                         return rc;
 548                 }
 549         } else {
 550                 /* We use ses->serverName if no domain name available */
 551                 len = strlen(ses->serverName);
 552
 553                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 554                 if (server == NULL) {
 555                         rc = -ENOMEM;
 556                         return rc;
 557                 }
 558                 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
 559                                         nls_cp);
 560                 rc =
 561                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 562                                         (char *)server, 2 * len);
 563                 kfree(server);
 564                 if (rc) {
 565                         cifs_dbg(VFS, "%s: Could not update with server\n",
 566                                  __func__);
 567                         return rc;
 568                 }
 569         }
 570
 571         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 572                                         ntlmv2_hash);
 573         if (rc)
 574                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 575
 576         return rc;
 577 }
 578
 579 static int
 580 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 581 {
 582         int rc;
 583         struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
 584             (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 585         unsigned int hash_len;
 586
 587         /* The MD5 hash starts at challenge_key.key */
 588         hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
 589                 offsetof(struct ntlmv2_resp, challenge.key[0]));
 590
 591         if (!ses->server->secmech.sdeschmacmd5) {
 592                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 593                 return -1;
 594         }
 595
 596         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 597                                  ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 598         if (rc) {
 599                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 600                          __func__);
 601                 return rc;
 602         }
 603
 604         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 605         if (rc) {
 606                 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
 607                 return rc;
 608         }
 609
 610         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
 611                 memcpy(ntlmv2->challenge.key,
 612                        ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 613         else
 614                 memcpy(ntlmv2->challenge.key,
 615                        ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 616         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 617                                  ntlmv2->challenge.key, hash_len);
 618         if (rc) {
 619                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 620                 return rc;
 621         }
 622
 623         /* Note that the MD5 digest over writes anon.challenge_key.key */
 624         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 625                                 ntlmv2->ntlmv2_hash);
 626         if (rc)
 627                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 628
 629         return rc;
 630 }
 631
 632 int
 633 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 634 {
 635         int rc;
 636         int baselen;
 637         unsigned int tilen;
 638         struct ntlmv2_resp *ntlmv2;
 639         char ntlmv2_hash[16];
 640         unsigned char *tiblob = NULL; /* target info blob */
 641         __le64 rsp_timestamp;
 642
 643         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
 644                 if (!ses->domainName) {
 645                         if (ses->domainAuto) {
 646                                 rc = find_domain_name(ses, nls_cp);
 647                                 if (rc) {
 648                                         cifs_dbg(VFS, "error %d finding domain name\n",
 649                                                  rc);
 650                                         goto setup_ntlmv2_rsp_ret;
 651                                 }
 652                         } else {
 653                                 ses->domainName = kstrdup("", GFP_KERNEL);
 654                         }
 655                 }
 656         } else {
 657                 rc = build_avpair_blob(ses, nls_cp);
 658                 if (rc) {
 659                         cifs_dbg(VFS, "error %d building av pair blob\n", rc);
 660                         goto setup_ntlmv2_rsp_ret;
 661                 }
 662         }
 663
 664         /* Must be within 5 minutes of the server (or in range +/-2h
 665          * in case of Mac OS X), so simply carry over server timestamp
 666          * (as Windows 7 does)
 667          */
 668         rsp_timestamp = find_timestamp(ses);
 669
 670         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 671         tilen = ses->auth_key.len;
 672         tiblob = ses->auth_key.response;
 673
 674         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 675         if (!ses->auth_key.response) {
 676                 rc = -ENOMEM;
 677                 ses->auth_key.len = 0;
 678                 goto setup_ntlmv2_rsp_ret;
 679         }
 680         ses->auth_key.len += baselen;
 681
 682         ntlmv2 = (struct ntlmv2_resp *)
 683                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 684         ntlmv2->blob_signature = cpu_to_le32(0x00000101);
 685         ntlmv2->reserved = 0;
 686         ntlmv2->time = rsp_timestamp;
 687
 688         get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
 689         ntlmv2->reserved2 = 0;
 690
 691         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 692
 693         mutex_lock(&ses->server->srv_mutex);
 694
 695         rc = cifs_alloc_hash("hmac(md5)",
 696                              &ses->server->secmech.hmacmd5,
 697                              &ses->server->secmech.sdeschmacmd5);
 698         if (rc) {
 699                 goto unlock;
 700         }
 701
 702         /* calculate ntlmv2_hash */
 703         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 704         if (rc) {
 705                 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
 706                 goto unlock;
 707         }
 708
 709         /* calculate first part of the client response (CR1) */
 710         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 711         if (rc) {
 712                 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
 713                 goto unlock;
 714         }
 715
 716         /* now calculate the session key for NTLMv2 */
 717         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 718                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 719         if (rc) {
 720                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 721                          __func__);
 722                 goto unlock;
 723         }
 724
 725         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 726         if (rc) {
 727                 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
 728                 goto unlock;
 729         }
 730
 731         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 732                 ntlmv2->ntlmv2_hash,
 733                 CIFS_HMAC_MD5_HASH_SIZE);
 734         if (rc) {
 735                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 736                 goto unlock;
 737         }
 738
 739         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 740                 ses->auth_key.response);
 741         if (rc)
 742                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 743
 744 unlock:
 745         mutex_unlock(&ses->server->srv_mutex);
 746 setup_ntlmv2_rsp_ret:
 747         kfree(tiblob);
 748
 749         return rc;
 750 }
 751
 752 int
 753 calc_seckey(struct cifs_ses *ses)
 754 {
 755         int rc;
 756         struct crypto_skcipher *tfm_arc4;
 757         struct scatterlist sgin, sgout;
 758         struct skcipher_request *req;
 759         unsigned char *sec_key;
 760
 761         sec_key = kmalloc(CIFS_SESS_KEY_SIZE, GFP_KERNEL);
 762         if (sec_key == NULL)
 763                 return -ENOMEM;
 764
 765         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 766
 767         tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 768         if (IS_ERR(tfm_arc4)) {
 769                 rc = PTR_ERR(tfm_arc4);
 770                 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
 771                 goto out;
 772         }
 773
 774         rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response,
 775                                         CIFS_SESS_KEY_SIZE);
 776         if (rc) {
 777                 cifs_dbg(VFS, "%s: Could not set response as a key\n",
 778                          __func__);
 779                 goto out_free_cipher;
 780         }
 781
 782         req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL);
 783         if (!req) {
 784                 rc = -ENOMEM;
 785                 cifs_dbg(VFS, "could not allocate crypto API arc4 request\n");
 786                 goto out_free_cipher;
 787         }
 788
 789         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 790         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 791
 792         skcipher_request_set_callback(req, 0, NULL, NULL);
 793         skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL);
 794
 795         rc = crypto_skcipher_encrypt(req);
 796         skcipher_request_free(req);
 797         if (rc) {
 798                 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
 799                 goto out_free_cipher;
 800         }
 801
 802         /* make secondary_key/nonce as session key */
 803         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 804         /* and make len as that of session key only */
 805         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 806
 807 out_free_cipher:
 808         crypto_free_skcipher(tfm_arc4);
 809 out:
 810         kfree(sec_key);
 811         return rc;
 812 }
 813
 814 void
 815 cifs_crypto_secmech_release(struct TCP_Server_Info *server)
 816 {
 817         if (server->secmech.cmacaes) {
 818                 crypto_free_shash(server->secmech.cmacaes);
 819                 server->secmech.cmacaes = NULL;
 820         }
 821
 822         if (server->secmech.hmacsha256) {
 823                 crypto_free_shash(server->secmech.hmacsha256);
 824                 server->secmech.hmacsha256 = NULL;
 825         }
 826
 827         if (server->secmech.md5) {
 828                 crypto_free_shash(server->secmech.md5);
 829                 server->secmech.md5 = NULL;
 830         }
 831
 832         if (server->secmech.sha512) {
 833                 crypto_free_shash(server->secmech.sha512);
 834                 server->secmech.sha512 = NULL;
 835         }
 836
 837         if (server->secmech.hmacmd5) {
 838                 crypto_free_shash(server->secmech.hmacmd5);
 839                 server->secmech.hmacmd5 = NULL;
 840         }
 841
 842         if (server->secmech.ccmaesencrypt) {
 843                 crypto_free_aead(server->secmech.ccmaesencrypt);
 844                 server->secmech.ccmaesencrypt = NULL;
 845         }
 846
 847         if (server->secmech.ccmaesdecrypt) {
 848                 crypto_free_aead(server->secmech.ccmaesdecrypt);
 849                 server->secmech.ccmaesdecrypt = NULL;
 850         }
 851
 852         kfree(server->secmech.sdesccmacaes);
 853         server->secmech.sdesccmacaes = NULL;
 854         kfree(server->secmech.sdeschmacsha256);
 855         server->secmech.sdeschmacsha256 = NULL;
 856         kfree(server->secmech.sdeschmacmd5);
 857         server->secmech.sdeschmacmd5 = NULL;
 858         kfree(server->secmech.sdescmd5);
 859         server->secmech.sdescmd5 = NULL;
 860         kfree(server->secmech.sdescsha512);
 861         server->secmech.sdescsha512 = NULL;
 862 }