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 || server == NULL || signature == NULL)
  51                 return -EINVAL;
  52
  53         if (!server->ntlmssp.sdescmd5) {
  54                 cERROR(1,
  55                         "cifs_calculate_signature: can't generate signature\n");
  56                 return -1;
  57         }
  58
  59         rc = crypto_shash_init(&server->ntlmssp.sdescmd5->shash);
  60         if (rc) {
  61                 cERROR(1, "cifs_calculate_signature: oould not init md5\n");
  62                 return rc;
  63         }
  64
  65         if (server->secType == RawNTLMSSP)
  66                 crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
  67                         server->session_key.data.ntlmv2.key,
  68                         CIFS_NTLMV2_SESSKEY_SIZE);
  69         else
  70                 crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
  71                         (char *)&server->session_key.data,
  72                         server->session_key.len);
  73
  74         crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
  75                         cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
  76
  77         rc = crypto_shash_final(&server->ntlmssp.sdescmd5->shash, signature);
  78
  79         return rc;
  80 }
  81
  82
  83 int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
  84                   __u32 *pexpected_response_sequence_number)
  85 {
  86         int rc = 0;
  87         char smb_signature[20];
  88
  89         if ((cifs_pdu == NULL) || (server == NULL))
  90                 return -EINVAL;
  91
  92         if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
  93                 return rc;
  94
  95         spin_lock(&GlobalMid_Lock);
  96         cifs_pdu->Signature.Sequence.SequenceNumber =
  97                         cpu_to_le32(server->sequence_number);
  98         cifs_pdu->Signature.Sequence.Reserved = 0;
  99
 100         *pexpected_response_sequence_number = server->sequence_number++;
 101         server->sequence_number++;
 102         spin_unlock(&GlobalMid_Lock);
 103
 104         rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
 105         if (rc)
 106                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 107         else
 108                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 109
 110         return rc;
 111 }
 112
 113 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
 114                         struct TCP_Server_Info *server, char *signature)
 115 {
 116         int i;
 117         int rc;
 118
 119         if (iov == NULL || server == NULL || signature == NULL)
 120                 return -EINVAL;
 121
 122         if (!server->ntlmssp.sdescmd5) {
 123                 cERROR(1, "cifs_calc_signature2: can't generate signature\n");
 124                 return -1;
 125         }
 126
 127         rc = crypto_shash_init(&server->ntlmssp.sdescmd5->shash);
 128         if (rc) {
 129                 cERROR(1, "cifs_calc_signature2: oould not init md5\n");
 130                 return rc;
 131         }
 132
 133         if (server->secType == RawNTLMSSP)
 134                 crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
 135                         server->session_key.data.ntlmv2.key,
 136                         CIFS_NTLMV2_SESSKEY_SIZE);
 137         else
 138                 crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
 139                         (char *)&server->session_key.data,
 140                         server->session_key.len);
 141
 142         for (i = 0; i < n_vec; i++) {
 143                 if (iov[i].iov_len == 0)
 144                         continue;
 145                 if (iov[i].iov_base == NULL) {
 146                         cERROR(1, "cifs_calc_signature2: null iovec entry");
 147                         return -EIO;
 148                 }
 149                 /* The first entry includes a length field (which does not get
 150                    signed that occupies the first 4 bytes before the header */
 151                 if (i == 0) {
 152                         if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
 153                                 break; /* nothing to sign or corrupt header */
 154                         crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
 155                                 iov[i].iov_base + 4, iov[i].iov_len - 4);
 156                 } else
 157                         crypto_shash_update(&server->ntlmssp.sdescmd5->shash,
 158                                 iov[i].iov_base, iov[i].iov_len);
 159         }
 160
 161         rc = crypto_shash_final(&server->ntlmssp.sdescmd5->shash, signature);
 162
 163         return rc;
 164 }
 165
 166 int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 167                    __u32 *pexpected_response_sequence_number)
 168 {
 169         int rc = 0;
 170         char smb_signature[20];
 171         struct smb_hdr *cifs_pdu = iov[0].iov_base;
 172
 173         if ((cifs_pdu == NULL) || (server == NULL))
 174                 return -EINVAL;
 175
 176         if ((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
 177                 return rc;
 178
 179         spin_lock(&GlobalMid_Lock);
 180         cifs_pdu->Signature.Sequence.SequenceNumber =
 181                                 cpu_to_le32(server->sequence_number);
 182         cifs_pdu->Signature.Sequence.Reserved = 0;
 183
 184         *pexpected_response_sequence_number = server->sequence_number++;
 185         server->sequence_number++;
 186         spin_unlock(&GlobalMid_Lock);
 187
 188         rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
 189         if (rc)
 190                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 191         else
 192                 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 193
 194         return rc;
 195 }
 196
 197 int cifs_verify_signature(struct smb_hdr *cifs_pdu,
 198                           struct TCP_Server_Info *server,
 199                           __u32 expected_sequence_number)
 200 {
 201         int rc;
 202         char server_response_sig[8];
 203         char what_we_think_sig_should_be[20];
 204
 205         if (cifs_pdu == NULL || server == NULL)
 206                 return -EINVAL;
 207
 208         if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
 209                 return 0;
 210
 211         if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 212                 struct smb_com_lock_req *pSMB =
 213                         (struct smb_com_lock_req *)cifs_pdu;
 214             if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 215                         return 0;
 216         }
 217
 218         /* BB what if signatures are supposed to be on for session but
 219            server does not send one? BB */
 220
 221         /* Do not need to verify session setups with signature "BSRSPYL "  */
 222         if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 223                 cFYI(1, "dummy signature received for smb command 0x%x",
 224                         cifs_pdu->Command);
 225
 226         /* save off the origiginal signature so we can modify the smb and check
 227                 its signature against what the server sent */
 228         memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 229
 230         cifs_pdu->Signature.Sequence.SequenceNumber =
 231                                         cpu_to_le32(expected_sequence_number);
 232         cifs_pdu->Signature.Sequence.Reserved = 0;
 233
 234         rc = cifs_calculate_signature(cifs_pdu, server,
 235                 what_we_think_sig_should_be);
 236
 237         if (rc)
 238                 return rc;
 239
 240 /*      cifs_dump_mem("what we think it should be: ",
 241                       what_we_think_sig_should_be, 16); */
 242
 243         if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 244                 return -EACCES;
 245         else
 246                 return 0;
 247
 248 }
 249
 250 /* We fill in key by putting in 40 byte array which was allocated by caller */
 251 int cifs_calculate_session_key(struct session_key *key, const char *rn,
 252                            const char *password)
 253 {
 254         char temp_key[16];
 255         if ((key == NULL) || (rn == NULL))
 256                 return -EINVAL;
 257
 258         E_md4hash(password, temp_key);
 259         mdfour(key->data.ntlm, temp_key, 16);
 260         memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE);
 261         key->len = 40;
 262         return 0;
 263 }
 264
 265 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 266 void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 267                         char *lnm_session_key)
 268 {
 269         int i;
 270         char password_with_pad[CIFS_ENCPWD_SIZE];
 271
 272         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 273         if (password)
 274                 strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 275
 276         if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 277                 memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 278                 memcpy(lnm_session_key, password_with_pad,
 279                         CIFS_ENCPWD_SIZE);
 280                 return;
 281         }
 282
 283         /* calculate old style session key */
 284         /* calling toupper is less broken than repeatedly
 285         calling nls_toupper would be since that will never
 286         work for UTF8, but neither handles multibyte code pages
 287         but the only alternative would be converting to UCS-16 (Unicode)
 288         (using a routine something like UniStrupr) then
 289         uppercasing and then converting back from Unicode - which
 290         would only worth doing it if we knew it were utf8. Basically
 291         utf8 and other multibyte codepages each need their own strupper
 292         function since a byte at a time will ont work. */
 293
 294         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 295                 password_with_pad[i] = toupper(password_with_pad[i]);
 296
 297         SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 298
 299         /* clear password before we return/free memory */
 300         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 301 }
 302 #endif /* CIFS_WEAK_PW_HASH */
 303
 304 static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
 305                             const struct nls_table *nls_cp)
 306 {
 307         int rc = 0;
 308         int len;
 309         char nt_hash[CIFS_NTHASH_SIZE];
 310         wchar_t *user;
 311         wchar_t *domain;
 312         wchar_t *server;
 313
 314         if (!ses->server->ntlmssp.sdeschmacmd5) {
 315                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 316                 return -1;
 317         }
 318
 319         /* calculate md4 hash of password */
 320         E_md4hash(ses->password, nt_hash);
 321
 322         crypto_shash_setkey(ses->server->ntlmssp.hmacmd5, nt_hash,
 323                                 CIFS_NTHASH_SIZE);
 324
 325         rc = crypto_shash_init(&ses->server->ntlmssp.sdeschmacmd5->shash);
 326         if (rc) {
 327                 cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5\n");
 328                 return rc;
 329         }
 330
 331         /* convert ses->userName to unicode and uppercase */
 332         len = strlen(ses->userName);
 333         user = kmalloc(2 + (len * 2), GFP_KERNEL);
 334         if (user == NULL) {
 335                 cERROR(1, "calc_ntlmv2_hash: user mem alloc failure\n");
 336                 rc = -ENOMEM;
 337                 goto calc_exit_2;
 338         }
 339         len = cifs_strtoUCS((__le16 *)user, ses->userName, len, nls_cp);
 340         UniStrupr(user);
 341
 342         crypto_shash_update(&ses->server->ntlmssp.sdeschmacmd5->shash,
 343                                 (char *)user, 2 * len);
 344
 345         /* convert ses->domainName to unicode and uppercase */
 346         if (ses->domainName) {
 347                 len = strlen(ses->domainName);
 348
 349                 domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 350                 if (domain == NULL) {
 351                         cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
 352                         rc = -ENOMEM;
 353                         goto calc_exit_1;
 354                 }
 355                 len = cifs_strtoUCS((__le16 *)domain, ses->domainName, len,
 356                                         nls_cp);
 357                 /* the following line was removed since it didn't work well
 358                    with lower cased domain name that passed as an option.
 359                    Maybe converting the domain name earlier makes sense */
 360                 /* UniStrupr(domain); */
 361
 362                 crypto_shash_update(&ses->server->ntlmssp.sdeschmacmd5->shash,
 363                                         (char *)domain, 2 * len);
 364
 365                 kfree(domain);
 366         } else if (ses->serverName) {
 367                 len = strlen(ses->serverName);
 368
 369                 server = kmalloc(2 + (len * 2), GFP_KERNEL);
 370                 if (server == NULL) {
 371                         cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
 372                         rc = -ENOMEM;
 373                         goto calc_exit_1;
 374                 }
 375                 len = cifs_strtoUCS((__le16 *)server, ses->serverName, len,
 376                                         nls_cp);
 377                 /* the following line was removed since it didn't work well
 378                    with lower cased domain name that passed as an option.
 379                    Maybe converting the domain name earlier makes sense */
 380                 /* UniStrupr(domain); */
 381
 382                 crypto_shash_update(&ses->server->ntlmssp.sdeschmacmd5->shash,
 383                                         (char *)server, 2 * len);
 384
 385                 kfree(server);
 386         }
 387
 388         rc = crypto_shash_final(&ses->server->ntlmssp.sdeschmacmd5->shash,
 389                                         ses->server->ntlmv2_hash);
 390
 391 calc_exit_1:
 392         kfree(user);
 393 calc_exit_2:
 394         /* BB FIXME what about bytes 24 through 40 of the signing key?
 395            compare with the NTLM example */
 396
 397         return rc;
 398 }
 399
 400 static int
 401 find_domain_name(struct cifsSesInfo *ses)
 402 {
 403         int rc = 0;
 404         unsigned int attrsize;
 405         unsigned int type;
 406         unsigned char *blobptr;
 407         struct ntlmssp2_name *attrptr;
 408
 409         if (ses->server->tiblob) {
 410                 blobptr = ses->server->tiblob;
 411                 attrptr = (struct ntlmssp2_name *) blobptr;
 412
 413                 while ((type = attrptr->type) != 0) {
 414                         blobptr += 2; /* advance attr type */
 415                         attrsize = attrptr->length;
 416                         blobptr += 2; /* advance attr size */
 417                         if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 418                                 if (!ses->domainName) {
 419                                         ses->domainName =
 420                                                 kmalloc(attrptr->length + 1,
 421                                                                 GFP_KERNEL);
 422                                         if (!ses->domainName)
 423                                                         return -ENOMEM;
 424                                         cifs_from_ucs2(ses->domainName,
 425                                                 (__le16 *)blobptr,
 426                                                 attrptr->length,
 427                                                 attrptr->length,
 428                                                 load_nls_default(), false);
 429                                 }
 430                         }
 431                         blobptr += attrsize; /* advance attr  value */
 432                         attrptr = (struct ntlmssp2_name *) blobptr;
 433                 }
 434         } else {
 435                 ses->server->tilen = 2 * sizeof(struct ntlmssp2_name);
 436                 ses->server->tiblob = kmalloc(ses->server->tilen, GFP_KERNEL);
 437                 if (!ses->server->tiblob) {
 438                         ses->server->tilen = 0;
 439                         cERROR(1, "Challenge target info allocation failure");
 440                         return -ENOMEM;
 441                 }
 442                 memset(ses->server->tiblob, 0x0, ses->server->tilen);
 443                 attrptr = (struct ntlmssp2_name *) ses->server->tiblob;
 444                 attrptr->type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
 445         }
 446
 447         return rc;
 448 }
 449
 450 static int
 451 CalcNTLMv2_response(const struct TCP_Server_Info *server,
 452                          char *v2_session_response)
 453 {
 454         int rc;
 455
 456         if (!server->ntlmssp.sdeschmacmd5) {
 457                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 458                 return -1;
 459         }
 460
 461         crypto_shash_setkey(server->ntlmssp.hmacmd5, server->ntlmv2_hash,
 462                 CIFS_HMAC_MD5_HASH_SIZE);
 463
 464         rc = crypto_shash_init(&server->ntlmssp.sdeschmacmd5->shash);
 465         if (rc) {
 466                 cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
 467                 return rc;
 468         }
 469
 470         memcpy(v2_session_response + CIFS_SERVER_CHALLENGE_SIZE,
 471                 server->cryptKey, CIFS_SERVER_CHALLENGE_SIZE);
 472         crypto_shash_update(&server->ntlmssp.sdeschmacmd5->shash,
 473                 v2_session_response + CIFS_SERVER_CHALLENGE_SIZE,
 474                 sizeof(struct ntlmv2_resp) - CIFS_SERVER_CHALLENGE_SIZE);
 475
 476         if (server->tilen)
 477                 crypto_shash_update(&server->ntlmssp.sdeschmacmd5->shash,
 478                                         server->tiblob, server->tilen);
 479
 480         rc = crypto_shash_final(&server->ntlmssp.sdeschmacmd5->shash,
 481                                         v2_session_response);
 482
 483         return rc;
 484 }
 485
 486 int
 487 setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
 488                       const struct nls_table *nls_cp)
 489 {
 490         int rc = 0;
 491         struct ntlmv2_resp *buf = (struct ntlmv2_resp *)resp_buf;
 492
 493         buf->blob_signature = cpu_to_le32(0x00000101);
 494         buf->reserved = 0;
 495         buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 496         get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 497         buf->reserved2 = 0;
 498
 499         if (!ses->domainName) {
 500                 rc = find_domain_name(ses);
 501                 if (rc) {
 502                         cERROR(1, "could not get domain/server name rc %d", rc);
 503                         return rc;
 504                 }
 505         }
 506
 507         /* calculate buf->ntlmv2_hash */
 508         rc = calc_ntlmv2_hash(ses, nls_cp);
 509         if (rc) {
 510                 cERROR(1, "could not get v2 hash rc %d", rc);
 511                 return rc;
 512         }
 513         rc = CalcNTLMv2_response(ses->server, resp_buf);
 514         if (rc) {
 515                 cERROR(1, "could not get v2 hash rc %d", rc);
 516                 return rc;
 517         }
 518
 519         if (!ses->server->ntlmssp.sdeschmacmd5) {
 520                 cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash\n");
 521                 return -1;
 522         }
 523
 524         crypto_shash_setkey(ses->server->ntlmssp.hmacmd5,
 525                         ses->server->ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 526
 527         rc = crypto_shash_init(&ses->server->ntlmssp.sdeschmacmd5->shash);
 528         if (rc) {
 529                 cERROR(1, "setup_ntlmv2_rsp: could not init hmacmd5\n");
 530                 return rc;
 531         }
 532
 533         crypto_shash_update(&ses->server->ntlmssp.sdeschmacmd5->shash,
 534                                 resp_buf, CIFS_HMAC_MD5_HASH_SIZE);
 535
 536         rc = crypto_shash_final(&ses->server->ntlmssp.sdeschmacmd5->shash,
 537                 ses->server->session_key.data.ntlmv2.key);
 538
 539         memcpy(&ses->server->session_key.data.ntlmv2.resp, resp_buf,
 540                         sizeof(struct ntlmv2_resp));
 541         ses->server->session_key.len = 16 + sizeof(struct ntlmv2_resp);
 542
 543         return rc;
 544 }
 545
 546 int
 547 calc_seckey(struct TCP_Server_Info *server)
 548 {
 549         int rc;
 550         unsigned char sec_key[CIFS_NTLMV2_SESSKEY_SIZE];
 551         struct crypto_blkcipher *tfm_arc4;
 552         struct scatterlist sgin, sgout;
 553         struct blkcipher_desc desc;
 554
 555         get_random_bytes(sec_key, CIFS_NTLMV2_SESSKEY_SIZE);
 556
 557         tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)",
 558                                                 0, CRYPTO_ALG_ASYNC);
 559         if (!tfm_arc4 || IS_ERR(tfm_arc4)) {
 560                 cERROR(1, "could not allocate " "master crypto API arc4\n");
 561                 return 1;
 562         }
 563
 564         desc.tfm = tfm_arc4;
 565
 566         crypto_blkcipher_setkey(tfm_arc4,
 567                 server->session_key.data.ntlmv2.key, CIFS_CPHTXT_SIZE);
 568         sg_init_one(&sgin, sec_key, CIFS_CPHTXT_SIZE);
 569         sg_init_one(&sgout, server->ntlmssp.ciphertext, CIFS_CPHTXT_SIZE);
 570         rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 571
 572         if (!rc)
 573                 memcpy(server->session_key.data.ntlmv2.key,
 574                                 sec_key, CIFS_NTLMV2_SESSKEY_SIZE);
 575
 576         crypto_free_blkcipher(tfm_arc4);
 577
 578         return 0;
 579 }
 580
 581 void
 582 cifs_crypto_shash_release(struct TCP_Server_Info *server)
 583 {
 584         if (server->ntlmssp.md5)
 585                 crypto_free_shash(server->ntlmssp.md5);
 586
 587         if (server->ntlmssp.hmacmd5)
 588                 crypto_free_shash(server->ntlmssp.hmacmd5);
 589
 590         kfree(server->ntlmssp.sdeschmacmd5);
 591
 592         kfree(server->ntlmssp.sdescmd5);
 593 }
 594
 595 int
 596 cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
 597 {
 598         int rc;
 599         unsigned int size;
 600
 601         server->ntlmssp.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 602         if (!server->ntlmssp.hmacmd5 ||
 603                         IS_ERR(server->ntlmssp.hmacmd5)) {
 604                 cERROR(1, "could not allocate crypto hmacmd5\n");
 605                 return 1;
 606         }
 607
 608         server->ntlmssp.md5 = crypto_alloc_shash("md5", 0, 0);
 609         if (!server->ntlmssp.md5 || IS_ERR(server->ntlmssp.md5)) {
 610                 cERROR(1, "could not allocate crypto md5\n");
 611                 rc = 1;
 612                 goto cifs_crypto_shash_allocate_ret1;
 613         }
 614
 615         size = sizeof(struct shash_desc) +
 616                         crypto_shash_descsize(server->ntlmssp.hmacmd5);
 617         server->ntlmssp.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 618         if (!server->ntlmssp.sdeschmacmd5) {
 619                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
 620                 rc = -ENOMEM;
 621                 goto cifs_crypto_shash_allocate_ret2;
 622         }
 623         server->ntlmssp.sdeschmacmd5->shash.tfm = server->ntlmssp.hmacmd5;
 624         server->ntlmssp.sdeschmacmd5->shash.flags = 0x0;
 625
 626
 627         size = sizeof(struct shash_desc) +
 628                         crypto_shash_descsize(server->ntlmssp.md5);
 629         server->ntlmssp.sdescmd5 = kmalloc(size, GFP_KERNEL);
 630         if (!server->ntlmssp.sdescmd5) {
 631                 cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
 632                 rc = -ENOMEM;
 633                 goto cifs_crypto_shash_allocate_ret3;
 634         }
 635         server->ntlmssp.sdescmd5->shash.tfm = server->ntlmssp.md5;
 636         server->ntlmssp.sdescmd5->shash.flags = 0x0;
 637
 638         return 0;
 639
 640 cifs_crypto_shash_allocate_ret3:
 641         kfree(server->ntlmssp.sdeschmacmd5);
 642
 643 cifs_crypto_shash_allocate_ret2:
 644         crypto_free_shash(server->ntlmssp.md5);
 645
 646 cifs_crypto_shash_allocate_ret1:
 647         crypto_free_shash(server->ntlmssp.hmacmd5);
 648
 649         return rc;
 650 }