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