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         int is_smb2 = server->vals->header_preamble_size == 0;
  48
  49         /* iov[0] is actual data and not the rfc1002 length for SMB2+ */
  50         if (is_smb2) {
  51                 if (iov[0].iov_len <= 4)
  52                         return -EIO;
  53                 i = 0;
  54         } else {
  55                 if (n_vec < 2 || iov[0].iov_len != 4)
  56                         return -EIO;
  57                 i = 1; /* skip rfc1002 length */
  58         }
  59
  60         for (; i < n_vec; i++) {
  61                 if (iov[i].iov_len == 0)
  62                         continue;
  63                 if (iov[i].iov_base == NULL) {
  64                         cifs_dbg(VFS, "null iovec entry\n");
  65                         return -EIO;
  66                 }
  67
  68                 rc = crypto_shash_update(shash,
  69                                          iov[i].iov_base, iov[i].iov_len);
  70                 if (rc) {
  71                         cifs_dbg(VFS, "%s: Could not update with payload\n",
  72                                  __func__);
  73                         return rc;
  74                 }
  75         }
  76
  77         /* now hash over the rq_pages array */
  78         for (i = 0; i < rqst->rq_npages; i++) {
  79                 void *kaddr;
  80                 unsigned int len, offset;
  81
  82                 rqst_page_get_length(rqst, i, &len, &offset);
  83
  84                 kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
  85
  86                 rc = crypto_shash_update(shash, kaddr, len);
  87                 if (rc) {
  88                         cifs_dbg(VFS, "%s: Could not update with payload\n",
  89                                  __func__);
  90                         kunmap(rqst->rq_pages[i]);
  91                         return rc;
  92                 }
  93
  94                 kunmap(rqst->rq_pages[i]);
  95         }
  96
  97         rc = crypto_shash_final(shash, signature);
  98         if (rc)
  99                 cifs_dbg(VFS, "%s: Could not generate hash\n", __func__);
 100
 101         return rc;
 102 }
 103
 104 /*
 105  * Calculate and return the CIFS signature based on the mac key and SMB PDU.
 106  * The 16 byte signature must be allocated by the caller. Note we only use the
 107  * 1st eight bytes and that the smb header signature field on input contains
 108  * the sequence number before this function is called. Also, this function
 109  * should be called with the server->srv_mutex held.
 110  */
 111 static int cifs_calc_signature(struct smb_rqst *rqst,
 112                         struct TCP_Server_Info *server, char *signature)
 113 {
 114         int rc;
 115
 116         if (!rqst->rq_iov || !signature || !server)
 117                 return -EINVAL;
 118
 119         rc = cifs_alloc_hash("md5", &server->secmech.md5,
 120                              &server->secmech.sdescmd5);
 121         if (rc)
 122                 return -1;
 123
 124         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
 125         if (rc) {
 126                 cifs_dbg(VFS, "%s: Could not init md5\n", __func__);
 127                 return rc;
 128         }
 129
 130         rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
 131                 server->session_key.response, server->session_key.len);
 132         if (rc) {
 133                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 134                 return rc;
 135         }
 136
 137         return __cifs_calc_signature(rqst, server, signature,
 138                                      &server->secmech.sdescmd5->shash);
 139 }
 140
 141 /* must be called with server->srv_mutex held */
 142 int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
 143                    __u32 *pexpected_response_sequence_number)
 144 {
 145         int rc = 0;
 146         char smb_signature[20];
 147         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 148
 149         if (rqst->rq_iov[0].iov_len != 4 ||
 150             rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
 151                 return -EIO;
 152
 153         if ((cifs_pdu == NULL) || (server == NULL))
 154                 return -EINVAL;
 155
 156         if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 157             server->tcpStatus == CifsNeedNegotiate)
 158                 return rc;
 159
 160         if (!server->session_estab) {
 161                 memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 162                 return rc;
 163         }
 164
 165         cifs_pdu->Signature.Sequence.SequenceNumber =
 166                                 cpu_to_le32(server->sequence_number);
 167         cifs_pdu->Signature.Sequence.Reserved = 0;
 168
 169         *pexpected_response_sequence_number = ++server->sequence_number;
 170         ++server->sequence_number;
 171
 172         rc = cifs_calc_signature(rqst, server, smb_signature);
 173         if (rc)
 174                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 175         else
 176                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 177
 178         return rc;
 179 }
 180
 181 int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 182                    __u32 *pexpected_response_sequence)
 183 {
 184         struct smb_rqst rqst = { .rq_iov = iov,
 185                                  .rq_nvec = n_vec };
 186
 187         return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
 188 }
 189
 190 /* must be called with server->srv_mutex held */
 191 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 192                   __u32 *pexpected_response_sequence_number)
 193 {
 194         struct kvec iov[2];
 195
 196         iov[0].iov_base = cifs_pdu;
 197         iov[0].iov_len = 4;
 198         iov[1].iov_base = (char *)cifs_pdu + 4;
 199         iov[1].iov_len = be32_to_cpu(cifs_pdu->smb_buf_length);
 200
 201         return cifs_sign_smbv(iov, 2, server,
 202                               pexpected_response_sequence_number);
 203 }
 204
 205 int cifs_verify_signature(struct smb_rqst *rqst,
 206                           struct TCP_Server_Info *server,
 207                           __u32 expected_sequence_number)
 208 {
 209         unsigned int rc;
 210         char server_response_sig[8];
 211         char what_we_think_sig_should_be[20];
 212         struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 213
 214         if (rqst->rq_iov[0].iov_len != 4 ||
 215             rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base)
 216                 return -EIO;
 217
 218         if (cifs_pdu == NULL || server == NULL)
 219                 return -EINVAL;
 220
 221         if (!server->session_estab)
 222                 return 0;
 223
 224         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 225                 struct smb_com_lock_req *pSMB =
 226                         (struct smb_com_lock_req *)cifs_pdu;
 227             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 228                         return 0;
 229         }
 230
 231         /* BB what if signatures are supposed to be on for session but
 232            server does not send one? BB */
 233
 234         /* Do not need to verify session setups with signature "BSRSPYL "  */
 235         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 236                 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
 237                          cifs_pdu->Command);
 238
 239         /* save off the origiginal signature so we can modify the smb and check
 240                 its signature against what the server sent */
 241         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 242
 243         cifs_pdu->Signature.Sequence.SequenceNumber =
 244                                         cpu_to_le32(expected_sequence_number);
 245         cifs_pdu->Signature.Sequence.Reserved = 0;
 246
 247         mutex_lock(&server->srv_mutex);
 248         rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
 249         mutex_unlock(&server->srv_mutex);
 250
 251         if (rc)
 252                 return rc;
 253
 254 /*      cifs_dump_mem("what we think it should be: ",
 255                       what_we_think_sig_should_be, 16); */
 256
 257         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 258                 return -EACCES;
 259         else
 260                 return 0;
 261
 262 }
 263
 264 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 265 int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
 266 {
 267         int rc = 0;
 268         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 269         char temp_key[CIFS_SESS_KEY_SIZE];
 270
 271         if (!ses)
 272                 return -EINVAL;
 273
 274         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 275         if (!ses->auth_key.response)
 276                 return -ENOMEM;
 277
 278         ses->auth_key.len = temp_len;
 279
 280         rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 281                         ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
 282         if (rc) {
 283                 cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
 284                          __func__, rc);
 285                 return rc;
 286         }
 287
 288         rc = E_md4hash(ses->password, temp_key, nls_cp);
 289         if (rc) {
 290                 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
 291                          __func__, rc);
 292                 return rc;
 293         }
 294
 295         rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 296         if (rc)
 297                 cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
 298                          __func__, rc);
 299
 300         return rc;
 301 }
 302
 303 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 304 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 305                         char *lnm_session_key)
 306 {
 307         int i;
 308         int rc;
 309         char password_with_pad[CIFS_ENCPWD_SIZE] = {0};
 310
 311         if (password)
 312                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 313
 314         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 315                 memcpy(lnm_session_key, password_with_pad,
 316                         CIFS_ENCPWD_SIZE);
 317                 return 0;
 318         }
 319
 320         /* calculate old style session key */
 321         /* calling toupper is less broken than repeatedly
 322         calling nls_toupper would be since that will never
 323         work for UTF8, but neither handles multibyte code pages
 324         but the only alternative would be converting to UCS-16 (Unicode)
 325         (using a routine something like UniStrupr) then
 326         uppercasing and then converting back from Unicode - which
 327         would only worth doing it if we knew it were utf8. Basically
 328         utf8 and other multibyte codepages each need their own strupper
 329         function since a byte at a time will ont work. */
 330
 331         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 332                 password_with_pad[i] = toupper(password_with_pad[i]);
 333
 334         rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 335
 336         return rc;
 337 }
 338 #endif /* CIFS_WEAK_PW_HASH */
 339
 340 /* Build a proper attribute value/target info pairs blob.
 341  * Fill in netbios and dns domain name and workstation name
 342  * and client time (total five av pairs and + one end of fields indicator.
 343  * Allocate domain name which gets freed when session struct is deallocated.
 344  */
 345 static int
 346 build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 347 {
 348         unsigned int dlen;
 349         unsigned int size = 2 * sizeof(struct ntlmssp2_name);
 350         char *defdmname = "WORKGROUP";
 351         unsigned char *blobptr;
 352         struct ntlmssp2_name *attrptr;
 353
 354         if (!ses->domainName) {
 355                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 356                 if (!ses->domainName)
 357                         return -ENOMEM;
 358         }
 359
 360         dlen = strlen(ses->domainName);
 361
 362         /*
 363          * The length of this blob is two times the size of a
 364          * structure (av pair) which holds name/size
 365          * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
 366          * unicode length of a netbios domain name
 367          */
 368         ses->auth_key.len = size + 2 * dlen;
 369         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 370         if (!ses->auth_key.response) {
 371                 ses->auth_key.len = 0;
 372                 return -ENOMEM;
 373         }
 374
 375         blobptr = ses->auth_key.response;
 376         attrptr = (struct ntlmssp2_name *) blobptr;
 377
 378         /*
 379          * As defined in MS-NTLM 3.3.2, just this av pair field
 380          * is sufficient as part of the temp
 381          */
 382         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 383         attrptr->length = cpu_to_le16(2 * dlen);
 384         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 385         cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 386
 387         return 0;
 388 }
 389
 390 /* Server has provided av pairs/target info in the type 2 challenge
 391  * packet and we have plucked it and stored within smb session.
 392  * We parse that blob here to find netbios domain name to be used
 393  * as part of ntlmv2 authentication (in Target String), if not already
 394  * specified on the command line.
 395  * If this function returns without any error but without fetching
 396  * domain name, authentication may fail against some server but
 397  * may not fail against other (those who are not very particular
 398  * about target string i.e. for some, just user name might suffice.
 399  */
 400 static int
 401 find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 402 {
 403         unsigned int attrsize;
 404         unsigned int type;
 405         unsigned int onesize = sizeof(struct ntlmssp2_name);
 406         unsigned char *blobptr;
 407         unsigned char *blobend;
 408         struct ntlmssp2_name *attrptr;
 409
 410         if (!ses->auth_key.len || !ses->auth_key.response)
 411                 return 0;
 412
 413         blobptr = ses->auth_key.response;
 414         blobend = blobptr + ses->auth_key.len;
 415
 416         while (blobptr + onesize < blobend) {
 417                 attrptr = (struct ntlmssp2_name *) blobptr;
 418                 type = le16_to_cpu(attrptr->type);
 419                 if (type == NTLMSSP_AV_EOL)
 420                         break;
 421                 blobptr += 2; /* advance attr type */
 422                 attrsize = le16_to_cpu(attrptr->length);
 423                 blobptr += 2; /* advance attr size */
 424                 if (blobptr + attrsize > blobend)
 425                         break;
 426                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 427                         if (!attrsize || attrsize >= CIFS_MAX_DOMAINNAME_LEN)
 428                                 break;
 429                         if (!ses->domainName) {
 430                                 ses->domainName =
 431                                         kmalloc(attrsize + 1, GFP_KERNEL);
 432                                 if (!ses->domainName)
 433                                                 return -ENOMEM;
 434                                 cifs_from_utf16(ses->domainName,
 435                                         (__le16 *)blobptr, attrsize, attrsize,
 436                                         nls_cp, NO_MAP_UNI_RSVD);
 437                                 break;
 438                         }
 439                 }
 440                 blobptr += attrsize; /* advance attr  value */
 441         }
 442
 443         return 0;
 444 }
 445
 446 /* Server has provided av pairs/target info in the type 2 challenge
 447  * packet and we have plucked it and stored within smb session.
 448  * We parse that blob here to find the server given timestamp
 449  * as part of ntlmv2 authentication (or local current time as
 450  * default in case of failure)
 451  */
 452 static __le64
 453 find_timestamp(struct cifs_ses *ses)
 454 {
 455         unsigned int attrsize;
 456         unsigned int type;
 457         unsigned int onesize = sizeof(struct ntlmssp2_name);
 458         unsigned char *blobptr;
 459         unsigned char *blobend;
 460         struct ntlmssp2_name *attrptr;
 461         struct timespec64 ts;
 462
 463         if (!ses->auth_key.len || !ses->auth_key.response)
 464                 return 0;
 465
 466         blobptr = ses->auth_key.response;
 467         blobend = blobptr + ses->auth_key.len;
 468
 469         while (blobptr + onesize < blobend) {
 470                 attrptr = (struct ntlmssp2_name *) blobptr;
 471                 type = le16_to_cpu(attrptr->type);
 472                 if (type == NTLMSSP_AV_EOL)
 473                         break;
 474                 blobptr += 2; /* advance attr type */
 475                 attrsize = le16_to_cpu(attrptr->length);
 476                 blobptr += 2; /* advance attr size */
 477                 if (blobptr + attrsize > blobend)
 478                         break;
 479                 if (type == NTLMSSP_AV_TIMESTAMP) {
 480                         if (attrsize == sizeof(u64))
 481                                 return *((__le64 *)blobptr);
 482                 }
 483                 blobptr += attrsize; /* advance attr value */
 484         }
 485
 486         ktime_get_real_ts64(&ts);
 487         return cpu_to_le64(cifs_UnixTimeToNT(ts));
 488 }
 489
 490 static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 491                             const struct nls_table *nls_cp)
 492 {
 493         int rc = 0;
 494         int len;
 495         char nt_hash[CIFS_NTHASH_SIZE];
 496         __le16 *user;
 497         wchar_t *domain;
 498         wchar_t *server;
 499
 500         if (!ses->server->secmech.sdeschmacmd5) {
 501                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 502                 return -1;
 503         }
 504
 505         /* calculate md4 hash of password */
 506         E_md4hash(ses->password, nt_hash, nls_cp);
 507
 508         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 509                                 CIFS_NTHASH_SIZE);
 510         if (rc) {
 511                 cifs_dbg(VFS, "%s: Could not set NT Hash as a key\n", __func__);
 512                 return rc;
 513         }
 514
 515         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 516         if (rc) {
 517                 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
 518                 return rc;
 519         }
 520
 521         /* convert ses->user_name to unicode */
 522         len = ses->user_name ? strlen(ses->user_name) : 0;
 523         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 524         if (user == NULL) {
 525                 rc = -ENOMEM;
 526                 return rc;
 527         }
 528
 529         if (len) {
 530                 len = cifs_strtoUTF16(user, ses->user_name, len, nls_cp);
 531                 UniStrupr(user);
 532         } else {
 533                 memset(user, '\0', 2);
 534         }
 535
 536         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 537                                 (char *)user, 2 * len);
 538         kfree(user);
 539         if (rc) {
 540                 cifs_dbg(VFS, "%s: Could not update with user\n", __func__);
 541                 return rc;
 542         }
 543
 544         /* convert ses->domainName to unicode and uppercase */
 545         if (ses->domainName) {
 546                 len = strlen(ses->domainName);
 547
 548                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 549                 if (domain == NULL) {
 550                         rc = -ENOMEM;
 551                         return rc;
 552                 }
 553                 len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
 554                                       nls_cp);
 555                 rc =
 556                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 557                                         (char *)domain, 2 * len);
 558                 kfree(domain);
 559                 if (rc) {
 560                         cifs_dbg(VFS, "%s: Could not update with domain\n",
 561                                  __func__);
 562                         return rc;
 563                 }
 564         } else {
 565                 /* We use ses->serverName if no domain name available */
 566                 len = strlen(ses->serverName);
 567
 568                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 569                 if (server == NULL) {
 570                         rc = -ENOMEM;
 571                         return rc;
 572                 }
 573                 len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
 574                                         nls_cp);
 575                 rc =
 576                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 577                                         (char *)server, 2 * len);
 578                 kfree(server);
 579                 if (rc) {
 580                         cifs_dbg(VFS, "%s: Could not update with server\n",
 581                                  __func__);
 582                         return rc;
 583                 }
 584         }
 585
 586         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 587                                         ntlmv2_hash);
 588         if (rc)
 589                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 590
 591         return rc;
 592 }
 593
 594 static int
 595 CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 596 {
 597         int rc;
 598         struct ntlmv2_resp *ntlmv2 = (struct ntlmv2_resp *)
 599             (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 600         unsigned int hash_len;
 601
 602         /* The MD5 hash starts at challenge_key.key */
 603         hash_len = ses->auth_key.len - (CIFS_SESS_KEY_SIZE +
 604                 offsetof(struct ntlmv2_resp, challenge.key[0]));
 605
 606         if (!ses->server->secmech.sdeschmacmd5) {
 607                 cifs_dbg(VFS, "%s: can't generate ntlmv2 hash\n", __func__);
 608                 return -1;
 609         }
 610
 611         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 612                                  ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 613         if (rc) {
 614                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 615                          __func__);
 616                 return rc;
 617         }
 618
 619         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 620         if (rc) {
 621                 cifs_dbg(VFS, "%s: could not init hmacmd5\n", __func__);
 622                 return rc;
 623         }
 624
 625         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED)
 626                 memcpy(ntlmv2->challenge.key,
 627                        ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 628         else
 629                 memcpy(ntlmv2->challenge.key,
 630                        ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 631         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 632                                  ntlmv2->challenge.key, hash_len);
 633         if (rc) {
 634                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 635                 return rc;
 636         }
 637
 638         /* Note that the MD5 digest over writes anon.challenge_key.key */
 639         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 640                                 ntlmv2->ntlmv2_hash);
 641         if (rc)
 642                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 643
 644         return rc;
 645 }
 646
 647 int
 648 setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 649 {
 650         int rc;
 651         int baselen;
 652         unsigned int tilen;
 653         struct ntlmv2_resp *ntlmv2;
 654         char ntlmv2_hash[16];
 655         unsigned char *tiblob = NULL; /* target info blob */
 656         __le64 rsp_timestamp;
 657
 658         if (ses->server->negflavor == CIFS_NEGFLAVOR_EXTENDED) {
 659                 if (!ses->domainName) {
 660                         if (ses->domainAuto) {
 661                                 rc = find_domain_name(ses, nls_cp);
 662                                 if (rc) {
 663                                         cifs_dbg(VFS, "error %d finding domain name\n",
 664                                                  rc);
 665                                         goto setup_ntlmv2_rsp_ret;
 666                                 }
 667                         } else {
 668                                 ses->domainName = kstrdup("", GFP_KERNEL);
 669                         }
 670                 }
 671         } else {
 672                 rc = build_avpair_blob(ses, nls_cp);
 673                 if (rc) {
 674                         cifs_dbg(VFS, "error %d building av pair blob\n", rc);
 675                         goto setup_ntlmv2_rsp_ret;
 676                 }
 677         }
 678
 679         /* Must be within 5 minutes of the server (or in range +/-2h
 680          * in case of Mac OS X), so simply carry over server timestamp
 681          * (as Windows 7 does)
 682          */
 683         rsp_timestamp = find_timestamp(ses);
 684
 685         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 686         tilen = ses->auth_key.len;
 687         tiblob = ses->auth_key.response;
 688
 689         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 690         if (!ses->auth_key.response) {
 691                 rc = -ENOMEM;
 692                 ses->auth_key.len = 0;
 693                 goto setup_ntlmv2_rsp_ret;
 694         }
 695         ses->auth_key.len += baselen;
 696
 697         ntlmv2 = (struct ntlmv2_resp *)
 698                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 699         ntlmv2->blob_signature = cpu_to_le32(0x00000101);
 700         ntlmv2->reserved = 0;
 701         ntlmv2->time = rsp_timestamp;
 702
 703         get_random_bytes(&ntlmv2->client_chal, sizeof(ntlmv2->client_chal));
 704         ntlmv2->reserved2 = 0;
 705
 706         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 707
 708         mutex_lock(&ses->server->srv_mutex);
 709
 710         rc = cifs_alloc_hash("hmac(md5)",
 711                              &ses->server->secmech.hmacmd5,
 712                              &ses->server->secmech.sdeschmacmd5);
 713         if (rc) {
 714                 goto unlock;
 715         }
 716
 717         /* calculate ntlmv2_hash */
 718         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 719         if (rc) {
 720                 cifs_dbg(VFS, "could not get v2 hash rc %d\n", rc);
 721                 goto unlock;
 722         }
 723
 724         /* calculate first part of the client response (CR1) */
 725         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 726         if (rc) {
 727                 cifs_dbg(VFS, "Could not calculate CR1 rc: %d\n", rc);
 728                 goto unlock;
 729         }
 730
 731         /* now calculate the session key for NTLMv2 */
 732         rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 733                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 734         if (rc) {
 735                 cifs_dbg(VFS, "%s: Could not set NTLMV2 Hash as a key\n",
 736                          __func__);
 737                 goto unlock;
 738         }
 739
 740         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 741         if (rc) {
 742                 cifs_dbg(VFS, "%s: Could not init hmacmd5\n", __func__);
 743                 goto unlock;
 744         }
 745
 746         rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 747                 ntlmv2->ntlmv2_hash,
 748                 CIFS_HMAC_MD5_HASH_SIZE);
 749         if (rc) {
 750                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 751                 goto unlock;
 752         }
 753
 754         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 755                 ses->auth_key.response);
 756         if (rc)
 757                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
 758
 759 unlock:
 760         mutex_unlock(&ses->server->srv_mutex);
 761 setup_ntlmv2_rsp_ret:
 762         kfree(tiblob);
 763
 764         return rc;
 765 }
 766
 767 int
 768 calc_seckey(struct cifs_ses *ses)
 769 {
 770         int rc;
 771         struct crypto_skcipher *tfm_arc4;
 772         struct scatterlist sgin, sgout;
 773         struct skcipher_request *req;
 774         unsigned char *sec_key;
 775
 776         sec_key = kmalloc(CIFS_SESS_KEY_SIZE, GFP_KERNEL);
 777         if (sec_key == NULL)
 778                 return -ENOMEM;
 779
 780         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 781
 782         tfm_arc4 = crypto_alloc_skcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 783         if (IS_ERR(tfm_arc4)) {
 784                 rc = PTR_ERR(tfm_arc4);
 785                 cifs_dbg(VFS, "could not allocate crypto API arc4\n");
 786                 goto out;
 787         }
 788
 789         rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response,
 790                                         CIFS_SESS_KEY_SIZE);
 791         if (rc) {
 792                 cifs_dbg(VFS, "%s: Could not set response as a key\n",
 793                          __func__);
 794                 goto out_free_cipher;
 795         }
 796
 797         req = skcipher_request_alloc(tfm_arc4, GFP_KERNEL);
 798         if (!req) {
 799                 rc = -ENOMEM;
 800                 cifs_dbg(VFS, "could not allocate crypto API arc4 request\n");
 801                 goto out_free_cipher;
 802         }
 803
 804         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 805         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 806
 807         skcipher_request_set_callback(req, 0, NULL, NULL);
 808         skcipher_request_set_crypt(req, &sgin, &sgout, CIFS_CPHTXT_SIZE, NULL);
 809
 810         rc = crypto_skcipher_encrypt(req);
 811         skcipher_request_free(req);
 812         if (rc) {
 813                 cifs_dbg(VFS, "could not encrypt session key rc: %d\n", rc);
 814                 goto out_free_cipher;
 815         }
 816
 817         /* make secondary_key/nonce as session key */
 818         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 819         /* and make len as that of session key only */
 820         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 821
 822 out_free_cipher:
 823         crypto_free_skcipher(tfm_arc4);
 824 out:
 825         kfree(sec_key);
 826         return rc;
 827 }
 828
 829 void
 830 cifs_crypto_secmech_release(struct TCP_Server_Info *server)
 831 {
 832         if (server->secmech.cmacaes) {
 833                 crypto_free_shash(server->secmech.cmacaes);
 834                 server->secmech.cmacaes = NULL;
 835         }
 836
 837         if (server->secmech.hmacsha256) {
 838                 crypto_free_shash(server->secmech.hmacsha256);
 839                 server->secmech.hmacsha256 = NULL;
 840         }
 841
 842         if (server->secmech.md5) {
 843                 crypto_free_shash(server->secmech.md5);
 844                 server->secmech.md5 = NULL;
 845         }
 846
 847         if (server->secmech.sha512) {
 848                 crypto_free_shash(server->secmech.sha512);
 849                 server->secmech.sha512 = NULL;
 850         }
 851
 852         if (server->secmech.hmacmd5) {
 853                 crypto_free_shash(server->secmech.hmacmd5);
 854                 server->secmech.hmacmd5 = NULL;
 855         }
 856
 857         if (server->secmech.ccmaesencrypt) {
 858                 crypto_free_aead(server->secmech.ccmaesencrypt);
 859                 server->secmech.ccmaesencrypt = NULL;
 860         }
 861
 862         if (server->secmech.ccmaesdecrypt) {
 863                 crypto_free_aead(server->secmech.ccmaesdecrypt);
 864                 server->secmech.ccmaesdecrypt = NULL;
 865         }
 866
 867         kfree(server->secmech.sdesccmacaes);
 868         server->secmech.sdesccmacaes = NULL;
 869         kfree(server->secmech.sdeschmacsha256);
 870         server->secmech.sdeschmacsha256 = NULL;
 871         kfree(server->secmech.sdeschmacmd5);
 872         server->secmech.sdeschmacmd5 = NULL;
 873         kfree(server->secmech.sdescmd5);
 874         server->secmech.sdescmd5 = NULL;
 875         kfree(server->secmech.sdescsha512);
 876         server->secmech.sdescsha512 = NULL;
 877 }