fs/cifs/cifsencrypt.c

   1 /*
   2  *   fs/cifs/cifsencrypt.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2005,2006
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <linux/fs.h>
  23 #include <linux/slab.h>
  24 #include "cifspdu.h"
  25 #include "cifsglob.h"
  26 #include "cifs_debug.h"
  27 #include "md5.h"
  28 #include "cifs_unicode.h"
  29 #include "cifsproto.h"
  30 #include "ntlmssp.h"
  31 #include <linux/ctype.h>
  32 #include <linux/random.h>
  33
  34 /* Calculate and return the CIFS signature based on the mac key and SMB PDU */
  35 /* the 16 byte signature must be allocated by the caller  */
  36 /* Note we only use the 1st eight bytes */
  37 /* Note that the smb header signature field on input contains the
  38         sequence number before this function is called */
  39
  40 extern void mdfour(unsigned char *out, unsigned char *in, int n);
  41 extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
  42 extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
  43                        unsigned char *p24);
  44
  45 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
  46                                 struct TCP_Server_Info *server, char *signature)
  47 {
  48         int rc;
  49
  50         if (cifs_pdu == NULL || signature == NULL || server == NULL)
  51                 return -EINVAL;
  52
  53         if (!server->secmech.sdescmd5) {
  54                 cERROR(1, "%s: Can't generate signature\n", __func__);
  55                 return -1;
  56         }
  57
  58         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
  59         if (rc) {
  60                 cERROR(1, "%s: Oould not init md5\n", __func__);
  61                 return rc;
  62         }
  63
  64         crypto_shash_update(&server->secmech.sdescmd5->shash,
  65                 server->session_key.response, server->session_key.len);
  66
  67         crypto_shash_update(&server->secmech.sdescmd5->shash,
  68                 cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
  69
  70         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
  71
  72         return 0;
  73 }
  74
  75 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
  76                   __u32 *pexpected_response_sequence_number)
  77 {
  78         int rc = 0;
  79         char smb_signature[20];
  80
  81         if ((cifs_pdu == NULL) || (server == NULL))
  82                 return -EINVAL;
  83
  84         if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
  85                 return rc;
  86
  87         spin_lock(&GlobalMid_Lock);
  88         cifs_pdu->Signature.Sequence.SequenceNumber =
  89                         cpu_to_le32(server->sequence_number);
  90         cifs_pdu->Signature.Sequence.Reserved = 0;
  91
  92         *pexpected_response_sequence_number = server->sequence_number++;
  93         server->sequence_number++;
  94         spin_unlock(&GlobalMid_Lock);
  95
  96         rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
  97         if (rc)
  98                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
  99         else
 100                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 101
 102         return rc;
 103 }
 104
 105 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
 106                                 struct TCP_Server_Info *server, char *signature)
 107 {
 108         int i;
 109         int rc;
 110
 111         if (iov == NULL || signature == NULL || server == NULL)
 112                 return -EINVAL;
 113
 114         if (!server->secmech.sdescmd5) {
 115                 cERROR(1, "%s: Can't generate signature\n", __func__);
 116                 return -1;
 117         }
 118
 119         rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
 120         if (rc) {
 121                 cERROR(1, "%s: Oould not init md5\n", __func__);
 122                 return rc;
 123         }
 124
 125         crypto_shash_update(&server->secmech.sdescmd5->shash,
 126                 server->session_key.response, server->session_key.len);
 127
 128         for (i = 0; i < n_vec; i++) {
 129                 if (iov[i].iov_len == 0)
 130                         continue;
 131                 if (iov[i].iov_base == NULL) {
 132                         cERROR(1, "null iovec entry");
 133                         return -EIO;
 134                 }
 135                 /* The first entry includes a length field (which does not get
 136                    signed that occupies the first 4 bytes before the header */
 137                 if (i == 0) {
 138                         if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
 139                                 break; /* nothing to sign or corrupt header */
 140                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 141                                 iov[i].iov_base + 4, iov[i].iov_len - 4);
 142                 } else
 143                         crypto_shash_update(&server->secmech.sdescmd5->shash,
 144                                 iov[i].iov_base, iov[i].iov_len);
 145         }
 146
 147         rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
 148
 149         return rc;
 150 }
 151
 152 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 153                    __u32 *pexpected_response_sequence_number)
 154 {
 155         int rc = 0;
 156         char smb_signature[20];
 157         struct smb_hdr *cifs_pdu = iov[0].iov_base;
 158
 159         if ((cifs_pdu == NULL) || (server == NULL))
 160                 return -EINVAL;
 161
 162         if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
 163                 return rc;
 164
 165         spin_lock(&GlobalMid_Lock);
 166         cifs_pdu->Signature.Sequence.SequenceNumber =
 167                                 cpu_to_le32(server->sequence_number);
 168         cifs_pdu->Signature.Sequence.Reserved = 0;
 169
 170         *pexpected_response_sequence_number = server->sequence_number++;
 171         server->sequence_number++;
 172         spin_unlock(&GlobalMid_Lock);
 173
 174         rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
 175         if (rc)
 176                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 177         else
 178                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 179
 180         return rc;
 181 }
 182
 183 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
 184                           struct TCP_Server_Info *server,
 185                           __u32 expected_sequence_number)
 186 {
 187         unsigned int rc;
 188         char server_response_sig[8];
 189         char what_we_think_sig_should_be[20];
 190
 191         if (cifs_pdu == NULL || server == NULL)
 192                 return -EINVAL;
 193
 194         if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
 195                 return 0;
 196
 197         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 198                 struct smb_com_lock_req *pSMB =
 199                         (struct smb_com_lock_req *)cifs_pdu;
 200             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 201                         return 0;
 202         }
 203
 204         /* BB what if signatures are supposed to be on for session but
 205            server does not send one? BB */
 206
 207         /* Do not need to verify session setups with signature "BSRSPYL "  */
 208         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 209                 cFYI(1, "dummy signature received for smb command 0x%x",
 210                         cifs_pdu->Command);
 211
 212         /* save off the origiginal signature so we can modify the smb and check
 213                 its signature against what the server sent */
 214         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 215
 216         cifs_pdu->Signature.Sequence.SequenceNumber =
 217                                         cpu_to_le32(expected_sequence_number);
 218         cifs_pdu->Signature.Sequence.Reserved = 0;
 219
 220         rc = cifs_calculate_signature(cifs_pdu, server,
 221                 what_we_think_sig_should_be);
 222
 223         if (rc)
 224                 return rc;
 225
 226 /*      cifs_dump_mem("what we think it should be: ",
 227                       what_we_think_sig_should_be, 16); */
 228
 229         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 230                 return -EACCES;
 231         else
 232                 return 0;
 233
 234 }
 235
 236 /* first calculate 24 bytes ntlm response and then 16 byte session key */
 237 int setup_ntlm_response(struct cifsSesInfo *ses)
 238 {
 239         unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 240         char temp_key[CIFS_SESS_KEY_SIZE];
 241
 242         if (!ses)
 243                 return -EINVAL;
 244
 245         ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 246         if (!ses->auth_key.response) {
 247                 cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
 248                 return -ENOMEM;
 249         }
 250         ses->auth_key.len = temp_len;
 251
 252         SMBNTencrypt(ses->password, ses->server->cryptkey,
 253                         ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 254
 255         E_md4hash(ses->password, temp_key);
 256         mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 257
 258         return 0;
 259 }
 260
 261 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 262 void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 263                         char *lnm_session_key)
 264 {
 265         int i;
 266         char password_with_pad[CIFS_ENCPWD_SIZE];
 267
 268         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 269         if (password)
 270                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 271
 272         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 273                 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 274                 memcpy(lnm_session_key, password_with_pad,
 275                         CIFS_ENCPWD_SIZE);
 276                 return;
 277         }
 278
 279         /* calculate old style session key */
 280         /* calling toupper is less broken than repeatedly
 281         calling nls_toupper would be since that will never
 282         work for UTF8, but neither handles multibyte code pages
 283         but the only alternative would be converting to UCS-16 (Unicode)
 284         (using a routine something like UniStrupr) then
 285         uppercasing and then converting back from Unicode - which
 286         would only worth doing it if we knew it were utf8. Basically
 287         utf8 and other multibyte codepages each need their own strupper
 288         function since a byte at a time will ont work. */
 289
 290         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 291                 password_with_pad[i] = toupper(password_with_pad[i]);
 292
 293         SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 294
 295         /* clear password before we return/free memory */
 296         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 297 }
 298 #endif /* CIFS_WEAK_PW_HASH */
 299
 300 /* Build a proper attribute value/target info pairs blob.
 301  * Fill in netbios and dns domain name and workstation name
 302  * and client time (total five av pairs and + one end of fields indicator.
 303  * Allocate domain name which gets freed when session struct is deallocated.
 304  */
 305 static int
 306 build_avpair_blob(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
 307 {
 308         unsigned int dlen;
 309         unsigned int wlen;
 310         unsigned int size = 6 * sizeof(struct ntlmssp2_name);
 311         __le64  curtime;
 312         char *defdmname = "WORKGROUP";
 313         unsigned char *blobptr;
 314         struct ntlmssp2_name *attrptr;
 315
 316         if (!ses->domainName) {
 317                 ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 318                 if (!ses->domainName)
 319                         return -ENOMEM;
 320         }
 321
 322         dlen = strlen(ses->domainName);
 323         wlen = strlen(ses->server->hostname);
 324
 325         /* The length of this blob is a size which is
 326          * six times the size of a structure which holds name/size +
 327          * two times the unicode length of a domain name +
 328          * two times the unicode length of a server name +
 329          * size of a timestamp (which is 8 bytes).
 330          */
 331         ses->auth_key.len = size + 2 * (2 * dlen) + 2 * (2 * wlen) + 8;
 332         ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 333         if (!ses->auth_key.response) {
 334                 ses->auth_key.len = 0;
 335                 cERROR(1, "Challenge target info allocation failure");
 336                 return -ENOMEM;
 337         }
 338
 339         blobptr = ses->auth_key.response;
 340         attrptr = (struct ntlmssp2_name *) blobptr;
 341
 342         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 343         attrptr->length = cpu_to_le16(2 * dlen);
 344         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 345         cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 346
 347         blobptr += 2 * dlen;
 348         attrptr = (struct ntlmssp2_name *) blobptr;
 349
 350         attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_COMPUTER_NAME);
 351         attrptr->length = cpu_to_le16(2 * wlen);
 352         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 353         cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
 354
 355         blobptr += 2 * wlen;
 356         attrptr = (struct ntlmssp2_name *) blobptr;
 357
 358         attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_DOMAIN_NAME);
 359         attrptr->length = cpu_to_le16(2 * dlen);
 360         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 361         cifs_strtoUCS((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 362
 363         blobptr += 2 * dlen;
 364         attrptr = (struct ntlmssp2_name *) blobptr;
 365
 366         attrptr->type = cpu_to_le16(NTLMSSP_AV_DNS_COMPUTER_NAME);
 367         attrptr->length = cpu_to_le16(2 * wlen);
 368         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 369         cifs_strtoUCS((__le16 *)blobptr, ses->server->hostname, wlen, nls_cp);
 370
 371         blobptr += 2 * wlen;
 372         attrptr = (struct ntlmssp2_name *) blobptr;
 373
 374         attrptr->type = cpu_to_le16(NTLMSSP_AV_TIMESTAMP);
 375         attrptr->length = cpu_to_le16(sizeof(__le64));
 376         blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 377         curtime = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 378         memcpy(blobptr, &curtime, sizeof(__le64));
 379
 380         return 0;
 381 }
 382
 383 /* Server has provided av pairs/target info in the type 2 challenge
 384  * packet and we have plucked it and stored within smb session.
 385  * We parse that blob here to find netbios domain name to be used
 386  * as part of ntlmv2 authentication (in Target String), if not already
 387  * specified on the command line.
 388  * If this function returns without any error but without fetching
 389  * domain name, authentication may fail against some server but
 390  * may not fail against other (those who are not very particular
 391  * about target string i.e. for some, just user name might suffice.
 392  */
 393 static int
 394 find_domain_name(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
 395 {
 396         unsigned int attrsize;
 397         unsigned int type;
 398         unsigned int onesize = sizeof(struct ntlmssp2_name);
 399         unsigned char *blobptr;
 400         unsigned char *blobend;
 401         struct ntlmssp2_name *attrptr;
 402
 403         if (!ses->auth_key.len || !ses->auth_key.response)
 404                 return 0;
 405
 406         blobptr = ses->auth_key.response;
 407         blobend = blobptr + ses->auth_key.len;
 408
 409         while (blobptr + onesize < blobend) {
 410                 attrptr = (struct ntlmssp2_name *) blobptr;
 411                 type = le16_to_cpu(attrptr->type);
 412                 if (type == NTLMSSP_AV_EOL)
 413                         break;
 414                 blobptr += 2; /* advance attr type */
 415                 attrsize = le16_to_cpu(attrptr->length);
 416                 blobptr += 2; /* advance attr size */
 417                 if (blobptr + attrsize > blobend)
 418                         break;
 419                 if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 420                         if (!attrsize)
 421                                 break;
 422                         if (!ses->domainName) {
 423                                 ses->domainName =
 424                                         kmalloc(attrsize + 1, GFP_KERNEL);
 425                                 if (!ses->domainName)
 426                                                 return -ENOMEM;
 427                                 cifs_from_ucs2(ses->domainName,
 428                                         (__le16 *)blobptr, attrsize, attrsize,
 429                                         nls_cp, false);
 430                                 break;
 431                         }
 432                 }
 433                 blobptr += attrsize; /* advance attr  value */
 434         }
 435
 436         return 0;
 437 }
 438
 439 static int calc_ntlmv2_hash(struct cifsSesInfo *ses, char *ntlmv2_hash,
 440                             const struct nls_table *nls_cp)
 441 {
 442         int rc = 0;
 443         int len;
 444         char nt_hash[CIFS_NTHASH_SIZE];
 445         wchar_t *user;
 446         wchar_t *domain;
 447         wchar_t *server;
 448
 449         if (!ses->server->secmech.sdeschmacmd5) {
 450                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 451                 return -1;
 452         }
 453
 454         /* calculate md4 hash of password */
 455         E_md4hash(ses->password, nt_hash);
 456
 457         crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 458                                 CIFS_NTHASH_SIZE);
 459
 460         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 461         if (rc) {
 462                 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
 463                 return rc;
 464         }
 465
 466         /* convert ses->userName to unicode and uppercase */
 467         len = strlen(ses->userName);
 468         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 469         if (user == NULL) {
 470                 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
 471                 rc = -ENOMEM;
 472                 goto calc_exit_2;
 473         }
 474         len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
 475         UniStrupr(user);
 476
 477         crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 478                                 (char *)user, 2 * len);
 479
 480         /* convert ses->domainName to unicode and uppercase */
 481         if (ses->domainName) {
 482                 len = strlen(ses->domainName);
 483
 484                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 485                 if (domain == NULL) {
 486                         cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
 487                         rc = -ENOMEM;
 488                         goto calc_exit_1;
 489                 }
 490                 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
 491                                         nls_cp);
 492                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 493                                         (char *)domain, 2 * len);
 494                 kfree(domain);
 495         } else if (ses->serverName) {
 496                 len = strlen(ses->serverName);
 497
 498                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 499                 if (server == NULL) {
 500                         cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
 501                         rc = -ENOMEM;
 502                         goto calc_exit_1;
 503                 }
 504                 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
 505                                         nls_cp);
 506                 crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 507                                         (char *)server, 2 * len);
 508                 kfree(server);
 509         }
 510
 511         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 512                                         ntlmv2_hash);
 513
 514 calc_exit_1:
 515         kfree(user);
 516 calc_exit_2:
 517         return rc;
 518 }
 519
 520 static int
 521 CalcNTLMv2_response(const struct cifsSesInfo *ses, char *ntlmv2_hash)
 522 {
 523         int rc;
 524         unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
 525
 526         if (!ses->server->secmech.sdeschmacmd5) {
 527                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 528                 return -1;
 529         }
 530
 531         crypto_shash_setkey(ses->server->secmech.hmacmd5,
 532                                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 533
 534         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 535         if (rc) {
 536                 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
 537                 return rc;
 538         }
 539
 540         if (ses->server->secType == RawNTLMSSP)
 541                 memcpy(ses->auth_key.response + offset,
 542                         ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 543         else
 544                 memcpy(ses->auth_key.response + offset,
 545                         ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 546         crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 547                 ses->auth_key.response + offset, ses->auth_key.len - offset);
 548
 549         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 550                 ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 551
 552         return rc;
 553 }
 554
 555
 556 int
 557 setup_ntlmv2_rsp(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
 558 {
 559         int rc;
 560         int baselen;
 561         unsigned int tilen;
 562         struct ntlmv2_resp *buf;
 563         char ntlmv2_hash[16];
 564         unsigned char *tiblob = NULL; /* target info blob */
 565
 566         if (ses->server->secType == RawNTLMSSP) {
 567                 if (!ses->domainName) {
 568                         rc = find_domain_name(ses, nls_cp);
 569                         if (rc) {
 570                                 cERROR(1, "error %d finding domain name", rc);
 571                                 goto setup_ntlmv2_rsp_ret;
 572                         }
 573                 }
 574         } else {
 575                 rc = build_avpair_blob(ses, nls_cp);
 576                 if (rc) {
 577                         cERROR(1, "error %d building av pair blob", rc);
 578                         goto setup_ntlmv2_rsp_ret;
 579                 }
 580         }
 581
 582         baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 583         tilen = ses->auth_key.len;
 584         tiblob = ses->auth_key.response;
 585
 586         ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 587         if (!ses->auth_key.response) {
 588                 rc = ENOMEM;
 589                 ses->auth_key.len = 0;
 590                 cERROR(1, "%s: Can't allocate auth blob", __func__);
 591                 goto setup_ntlmv2_rsp_ret;
 592         }
 593         ses->auth_key.len += baselen;
 594
 595         buf = (struct ntlmv2_resp *)
 596                         (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 597         buf->blob_signature = cpu_to_le32(0x00000101);
 598         buf->reserved = 0;
 599         buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 600         get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 601         buf->reserved2 = 0;
 602
 603         memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 604
 605         /* calculate ntlmv2_hash */
 606         rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 607         if (rc) {
 608                 cERROR(1, "could not get v2 hash rc %d", rc);
 609                 goto setup_ntlmv2_rsp_ret;
 610         }
 611
 612         /* calculate first part of the client response (CR1) */
 613         rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 614         if (rc) {
 615                 cERROR(1, "Could not calculate CR1  rc: %d", rc);
 616                 goto setup_ntlmv2_rsp_ret;
 617         }
 618
 619         /* now calculate the session key for NTLMv2 */
 620         crypto_shash_setkey(ses->server->secmech.hmacmd5,
 621                 ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 622
 623         rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 624         if (rc) {
 625                 cERROR(1, "%s: Could not init hmacmd5\n", __func__);
 626                 goto setup_ntlmv2_rsp_ret;
 627         }
 628
 629         crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 630                 ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 631                 CIFS_HMAC_MD5_HASH_SIZE);
 632
 633         rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 634                 ses->auth_key.response);
 635
 636 setup_ntlmv2_rsp_ret:
 637         kfree(tiblob);
 638
 639         return rc;
 640 }
 641
 642 int
 643 calc_seckey(struct cifsSesInfo *ses)
 644 {
 645         int rc;
 646         struct crypto_blkcipher *tfm_arc4;
 647         struct scatterlist sgin, sgout;
 648         struct blkcipher_desc desc;
 649         unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 650
 651         get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 652
 653         tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 654         if (!tfm_arc4 || IS_ERR(tfm_arc4)) {
 655                 cERROR(1, "could not allocate crypto API arc4\n");
 656                 return PTR_ERR(tfm_arc4);
 657         }
 658
 659         desc.tfm = tfm_arc4;
 660
 661         crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 662                                         CIFS_SESS_KEY_SIZE);
 663
 664         sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 665         sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 666
 667         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 668         if (rc) {
 669                 cERROR(1, "could not encrypt session key rc: %d\n", rc);
 670                 crypto_free_blkcipher(tfm_arc4);
 671                 return rc;
 672         }
 673
 674         /* make secondary_key/nonce as session key */
 675         memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 676         /* and make len as that of session key only */
 677         ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 678
 679         crypto_free_blkcipher(tfm_arc4);
 680
 681         return 0;
 682 }
 683
 684 void
 685 cifs_crypto_shash_release(struct TCP_Server_Info *server)
 686 {
 687         if (server->secmech.md5)
 688                 crypto_free_shash(server->secmech.md5);
 689
 690         if (server->secmech.hmacmd5)
 691                 crypto_free_shash(server->secmech.hmacmd5);
 692
 693         kfree(server->secmech.sdeschmacmd5);
 694
 695         kfree(server->secmech.sdescmd5);
 696 }
 697
 698 int
 699 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
 700 {
 701         int rc;
 702         unsigned int size;
 703
 704         server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 705         if (!server->secmech.hmacmd5 ||
 706                         IS_ERR(server->secmech.hmacmd5)) {
 707                 cERROR(1, "could not allocate crypto hmacmd5\n");
 708                 return PTR_ERR(server->secmech.hmacmd5);
 709         }
 710
 711         server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
 712         if (!server->secmech.md5 || IS_ERR(server->secmech.md5)) {
 713                 cERROR(1, "could not allocate crypto md5\n");
 714                 rc = PTR_ERR(server->secmech.md5);
 715                 goto crypto_allocate_md5_fail;
 716         }
 717
 718         size = sizeof(struct shash_desc) +
 719                         crypto_shash_descsize(server->secmech.hmacmd5);
 720         server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 721         if (!server->secmech.sdeschmacmd5) {
 722                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
 723                 rc = -ENOMEM;
 724                 goto crypto_allocate_hmacmd5_sdesc_fail;
 725         }
 726         server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 727         server->secmech.sdeschmacmd5->shash.flags = 0x0;
 728
 729
 730         size = sizeof(struct shash_desc) +
 731                         crypto_shash_descsize(server->secmech.md5);
 732         server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
 733         if (!server->secmech.sdescmd5) {
 734                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
 735                 rc = -ENOMEM;
 736                 goto crypto_allocate_md5_sdesc_fail;
 737         }
 738         server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
 739         server->secmech.sdescmd5->shash.flags = 0x0;
 740
 741         return 0;
 742
 743 crypto_allocate_md5_sdesc_fail:
 744         kfree(server->secmech.sdeschmacmd5);
 745
 746 crypto_allocate_hmacmd5_sdesc_fail:
 747         crypto_free_shash(server->secmech.md5);
 748
 749 crypto_allocate_md5_fail:
 750         crypto_free_shash(server->secmech.hmacmd5);
 751
 752         return rc;
 753 }