linux/fs/cifs/cifsencrypt.c
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   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 "cifs_unicode.h"
  28#include "cifsproto.h"
  29#include "ntlmssp.h"
  30#include <linux/ctype.h>
  31#include <linux/random.h>
  32
  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. Note we only use the
  36 * 1st eight bytes and that the smb header signature field on input contains
  37 * the sequence number before this function is called. Also, this function
  38 * should be called with the server->srv_mutex held.
  39 */
  40static int cifs_calc_signature(const struct kvec *iov, int n_vec,
  41                        struct TCP_Server_Info *server, char *signature)
  42{
  43        int i;
  44        int rc;
  45
  46        if (iov == NULL || signature == NULL || server == NULL)
  47                return -EINVAL;
  48
  49        if (!server->secmech.sdescmd5) {
  50                cERROR(1, "%s: Can't generate signature", __func__);
  51                return -1;
  52        }
  53
  54        rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
  55        if (rc) {
  56                cERROR(1, "%s: Could not init md5", __func__);
  57                return rc;
  58        }
  59
  60        rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
  61                server->session_key.response, server->session_key.len);
  62        if (rc) {
  63                cERROR(1, "%s: Could not update with response", __func__);
  64                return rc;
  65        }
  66
  67        for (i = 0; i < n_vec; i++) {
  68                if (iov[i].iov_len == 0)
  69                        continue;
  70                if (iov[i].iov_base == NULL) {
  71                        cERROR(1, "null iovec entry");
  72                        return -EIO;
  73                }
  74                /* The first entry includes a length field (which does not get
  75                   signed that occupies the first 4 bytes before the header */
  76                if (i == 0) {
  77                        if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
  78                                break; /* nothing to sign or corrupt header */
  79                        rc =
  80                        crypto_shash_update(&server->secmech.sdescmd5->shash,
  81                                iov[i].iov_base + 4, iov[i].iov_len - 4);
  82                } else {
  83                        rc =
  84                        crypto_shash_update(&server->secmech.sdescmd5->shash,
  85                                iov[i].iov_base, iov[i].iov_len);
  86                }
  87                if (rc) {
  88                        cERROR(1, "%s: Could not update with payload",
  89                                                        __func__);
  90                        return rc;
  91                }
  92        }
  93
  94        rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
  95        if (rc)
  96                cERROR(1, "%s: Could not generate md5 hash", __func__);
  97
  98        return rc;
  99}
 100
 101/* must be called with server->srv_mutex held */
 102int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 103                   __u32 *pexpected_response_sequence_number)
 104{
 105        int rc = 0;
 106        char smb_signature[20];
 107        struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base;
 108
 109        if ((cifs_pdu == NULL) || (server == NULL))
 110                return -EINVAL;
 111
 112        if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 113            server->tcpStatus == CifsNeedNegotiate)
 114                return rc;
 115
 116        if (!server->session_estab) {
 117                memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 118                return rc;
 119        }
 120
 121        cifs_pdu->Signature.Sequence.SequenceNumber =
 122                                cpu_to_le32(server->sequence_number);
 123        cifs_pdu->Signature.Sequence.Reserved = 0;
 124
 125        *pexpected_response_sequence_number = server->sequence_number++;
 126        server->sequence_number++;
 127
 128        rc = cifs_calc_signature(iov, n_vec, server, smb_signature);
 129        if (rc)
 130                memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 131        else
 132                memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 133
 134        return rc;
 135}
 136
 137/* must be called with server->srv_mutex held */
 138int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 139                  __u32 *pexpected_response_sequence_number)
 140{
 141        struct kvec iov;
 142
 143        iov.iov_base = cifs_pdu;
 144        iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
 145
 146        return cifs_sign_smbv(&iov, 1, server,
 147                              pexpected_response_sequence_number);
 148}
 149
 150int cifs_verify_signature(struct kvec *iov, unsigned int nr_iov,
 151                          struct TCP_Server_Info *server,
 152                          __u32 expected_sequence_number)
 153{
 154        unsigned int rc;
 155        char server_response_sig[8];
 156        char what_we_think_sig_should_be[20];
 157        struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base;
 158
 159        if (cifs_pdu == NULL || server == NULL)
 160                return -EINVAL;
 161
 162        if (!server->session_estab)
 163                return 0;
 164
 165        if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 166                struct smb_com_lock_req *pSMB =
 167                        (struct smb_com_lock_req *)cifs_pdu;
 168            if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 169                        return 0;
 170        }
 171
 172        /* BB what if signatures are supposed to be on for session but
 173           server does not send one? BB */
 174
 175        /* Do not need to verify session setups with signature "BSRSPYL "  */
 176        if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 177                cFYI(1, "dummy signature received for smb command 0x%x",
 178                        cifs_pdu->Command);
 179
 180        /* save off the origiginal signature so we can modify the smb and check
 181                its signature against what the server sent */
 182        memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 183
 184        cifs_pdu->Signature.Sequence.SequenceNumber =
 185                                        cpu_to_le32(expected_sequence_number);
 186        cifs_pdu->Signature.Sequence.Reserved = 0;
 187
 188        mutex_lock(&server->srv_mutex);
 189        rc = cifs_calc_signature(iov, nr_iov, server,
 190                                 what_we_think_sig_should_be);
 191        mutex_unlock(&server->srv_mutex);
 192
 193        if (rc)
 194                return rc;
 195
 196/*      cifs_dump_mem("what we think it should be: ",
 197                      what_we_think_sig_should_be, 16); */
 198
 199        if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 200                return -EACCES;
 201        else
 202                return 0;
 203
 204}
 205
 206/* first calculate 24 bytes ntlm response and then 16 byte session key */
 207int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
 208{
 209        int rc = 0;
 210        unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 211        char temp_key[CIFS_SESS_KEY_SIZE];
 212
 213        if (!ses)
 214                return -EINVAL;
 215
 216        ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 217        if (!ses->auth_key.response) {
 218                cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
 219                return -ENOMEM;
 220        }
 221        ses->auth_key.len = temp_len;
 222
 223        rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 224                        ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
 225        if (rc) {
 226                cFYI(1, "%s Can't generate NTLM response, error: %d",
 227                        __func__, rc);
 228                return rc;
 229        }
 230
 231        rc = E_md4hash(ses->password, temp_key, nls_cp);
 232        if (rc) {
 233                cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
 234                return rc;
 235        }
 236
 237        rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 238        if (rc)
 239                cFYI(1, "%s Can't generate NTLM session key, error: %d",
 240                        __func__, rc);
 241
 242        return rc;
 243}
 244
 245#ifdef CONFIG_CIFS_WEAK_PW_HASH
 246int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 247                        char *lnm_session_key)
 248{
 249        int i;
 250        int rc;
 251        char password_with_pad[CIFS_ENCPWD_SIZE];
 252
 253        memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 254        if (password)
 255                strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 256
 257        if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 258                memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 259                memcpy(lnm_session_key, password_with_pad,
 260                        CIFS_ENCPWD_SIZE);
 261                return 0;
 262        }
 263
 264        /* calculate old style session key */
 265        /* calling toupper is less broken than repeatedly
 266        calling nls_toupper would be since that will never
 267        work for UTF8, but neither handles multibyte code pages
 268        but the only alternative would be converting to UCS-16 (Unicode)
 269        (using a routine something like UniStrupr) then
 270        uppercasing and then converting back from Unicode - which
 271        would only worth doing it if we knew it were utf8. Basically
 272        utf8 and other multibyte codepages each need their own strupper
 273        function since a byte at a time will ont work. */
 274
 275        for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 276                password_with_pad[i] = toupper(password_with_pad[i]);
 277
 278        rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 279
 280        return rc;
 281}
 282#endif /* CIFS_WEAK_PW_HASH */
 283
 284/* Build a proper attribute value/target info pairs blob.
 285 * Fill in netbios and dns domain name and workstation name
 286 * and client time (total five av pairs and + one end of fields indicator.
 287 * Allocate domain name which gets freed when session struct is deallocated.
 288 */
 289static int
 290build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 291{
 292        unsigned int dlen;
 293        unsigned int size = 2 * sizeof(struct ntlmssp2_name);
 294        char *defdmname = "WORKGROUP";
 295        unsigned char *blobptr;
 296        struct ntlmssp2_name *attrptr;
 297
 298        if (!ses->domainName) {
 299                ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 300                if (!ses->domainName)
 301                        return -ENOMEM;
 302        }
 303
 304        dlen = strlen(ses->domainName);
 305
 306        /*
 307         * The length of this blob is two times the size of a
 308         * structure (av pair) which holds name/size
 309         * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
 310         * unicode length of a netbios domain name
 311         */
 312        ses->auth_key.len = size + 2 * dlen;
 313        ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 314        if (!ses->auth_key.response) {
 315                ses->auth_key.len = 0;
 316                cERROR(1, "Challenge target info allocation failure");
 317                return -ENOMEM;
 318        }
 319
 320        blobptr = ses->auth_key.response;
 321        attrptr = (struct ntlmssp2_name *) blobptr;
 322
 323        /*
 324         * As defined in MS-NTLM 3.3.2, just this av pair field
 325         * is sufficient as part of the temp
 326         */
 327        attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 328        attrptr->length = cpu_to_le16(2 * dlen);
 329        blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 330        cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 331
 332        return 0;
 333}
 334
 335/* Server has provided av pairs/target info in the type 2 challenge
 336 * packet and we have plucked it and stored within smb session.
 337 * We parse that blob here to find netbios domain name to be used
 338 * as part of ntlmv2 authentication (in Target String), if not already
 339 * specified on the command line.
 340 * If this function returns without any error but without fetching
 341 * domain name, authentication may fail against some server but
 342 * may not fail against other (those who are not very particular
 343 * about target string i.e. for some, just user name might suffice.
 344 */
 345static int
 346find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 347{
 348        unsigned int attrsize;
 349        unsigned int type;
 350        unsigned int onesize = sizeof(struct ntlmssp2_name);
 351        unsigned char *blobptr;
 352        unsigned char *blobend;
 353        struct ntlmssp2_name *attrptr;
 354
 355        if (!ses->auth_key.len || !ses->auth_key.response)
 356                return 0;
 357
 358        blobptr = ses->auth_key.response;
 359        blobend = blobptr + ses->auth_key.len;
 360
 361        while (blobptr + onesize < blobend) {
 362                attrptr = (struct ntlmssp2_name *) blobptr;
 363                type = le16_to_cpu(attrptr->type);
 364                if (type == NTLMSSP_AV_EOL)
 365                        break;
 366                blobptr += 2; /* advance attr type */
 367                attrsize = le16_to_cpu(attrptr->length);
 368                blobptr += 2; /* advance attr size */
 369                if (blobptr + attrsize > blobend)
 370                        break;
 371                if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 372                        if (!attrsize)
 373                                break;
 374                        if (!ses->domainName) {
 375                                ses->domainName =
 376                                        kmalloc(attrsize + 1, GFP_KERNEL);
 377                                if (!ses->domainName)
 378                                                return -ENOMEM;
 379                                cifs_from_utf16(ses->domainName,
 380                                        (__le16 *)blobptr, attrsize, attrsize,
 381                                        nls_cp, false);
 382                                break;
 383                        }
 384                }
 385                blobptr += attrsize; /* advance attr  value */
 386        }
 387
 388        return 0;
 389}
 390
 391static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 392                            const struct nls_table *nls_cp)
 393{
 394        int rc = 0;
 395        int len;
 396        char nt_hash[CIFS_NTHASH_SIZE];
 397        wchar_t *user;
 398        wchar_t *domain;
 399        wchar_t *server;
 400
 401        if (!ses->server->secmech.sdeschmacmd5) {
 402                cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash");
 403                return -1;
 404        }
 405
 406        /* calculate md4 hash of password */
 407        E_md4hash(ses->password, nt_hash, nls_cp);
 408
 409        rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 410                                CIFS_NTHASH_SIZE);
 411        if (rc) {
 412                cERROR(1, "%s: Could not set NT Hash as a key", __func__);
 413                return rc;
 414        }
 415
 416        rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 417        if (rc) {
 418                cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5");
 419                return rc;
 420        }
 421
 422        /* convert ses->user_name to unicode and uppercase */
 423        len = ses->user_name ? strlen(ses->user_name) : 0;
 424        user = kmalloc(2 + (len * 2), GFP_KERNEL);
 425        if (user == NULL) {
 426                cERROR(1, "calc_ntlmv2_hash: user mem alloc failure");
 427                rc = -ENOMEM;
 428                return rc;
 429        }
 430
 431        if (len) {
 432                len = cifs_strtoUTF16((__le16 *)user, ses->user_name, len, nls_cp);
 433                UniStrupr(user);
 434        } else {
 435                memset(user, '\0', 2);
 436        }
 437
 438        rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 439                                (char *)user, 2 * len);
 440        kfree(user);
 441        if (rc) {
 442                cERROR(1, "%s: Could not update with user", __func__);
 443                return rc;
 444        }
 445
 446        /* convert ses->domainName to unicode and uppercase */
 447        if (ses->domainName) {
 448                len = strlen(ses->domainName);
 449
 450                domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 451                if (domain == NULL) {
 452                        cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
 453                        rc = -ENOMEM;
 454                        return rc;
 455                }
 456                len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
 457                                      nls_cp);
 458                rc =
 459                crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 460                                        (char *)domain, 2 * len);
 461                kfree(domain);
 462                if (rc) {
 463                        cERROR(1, "%s: Could not update with domain",
 464                                                                __func__);
 465                        return rc;
 466                }
 467        } else if (ses->serverName) {
 468                len = strlen(ses->serverName);
 469
 470                server = kmalloc(2 + (len * 2), GFP_KERNEL);
 471                if (server == NULL) {
 472                        cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
 473                        rc = -ENOMEM;
 474                        return rc;
 475                }
 476                len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
 477                                        nls_cp);
 478                rc =
 479                crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 480                                        (char *)server, 2 * len);
 481                kfree(server);
 482                if (rc) {
 483                        cERROR(1, "%s: Could not update with server",
 484                                                                __func__);
 485                        return rc;
 486                }
 487        }
 488
 489        rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 490                                        ntlmv2_hash);
 491        if (rc)
 492                cERROR(1, "%s: Could not generate md5 hash", __func__);
 493
 494        return rc;
 495}
 496
 497static int
 498CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 499{
 500        int rc;
 501        unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
 502
 503        if (!ses->server->secmech.sdeschmacmd5) {
 504                cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash");
 505                return -1;
 506        }
 507
 508        rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 509                                ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 510        if (rc) {
 511                cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 512                return rc;
 513        }
 514
 515        rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 516        if (rc) {
 517                cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
 518                return rc;
 519        }
 520
 521        if (ses->server->secType == RawNTLMSSP)
 522                memcpy(ses->auth_key.response + offset,
 523                        ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 524        else
 525                memcpy(ses->auth_key.response + offset,
 526                        ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 527        rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 528                ses->auth_key.response + offset, ses->auth_key.len - offset);
 529        if (rc) {
 530                cERROR(1, "%s: Could not update with response", __func__);
 531                return rc;
 532        }
 533
 534        rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 535                ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 536        if (rc)
 537                cERROR(1, "%s: Could not generate md5 hash", __func__);
 538
 539        return rc;
 540}
 541
 542
 543int
 544setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 545{
 546        int rc;
 547        int baselen;
 548        unsigned int tilen;
 549        struct ntlmv2_resp *buf;
 550        char ntlmv2_hash[16];
 551        unsigned char *tiblob = NULL; /* target info blob */
 552
 553        if (ses->server->secType == RawNTLMSSP) {
 554                if (!ses->domainName) {
 555                        rc = find_domain_name(ses, nls_cp);
 556                        if (rc) {
 557                                cERROR(1, "error %d finding domain name", rc);
 558                                goto setup_ntlmv2_rsp_ret;
 559                        }
 560                }
 561        } else {
 562                rc = build_avpair_blob(ses, nls_cp);
 563                if (rc) {
 564                        cERROR(1, "error %d building av pair blob", rc);
 565                        goto setup_ntlmv2_rsp_ret;
 566                }
 567        }
 568
 569        baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 570        tilen = ses->auth_key.len;
 571        tiblob = ses->auth_key.response;
 572
 573        ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 574        if (!ses->auth_key.response) {
 575                rc = ENOMEM;
 576                ses->auth_key.len = 0;
 577                cERROR(1, "%s: Can't allocate auth blob", __func__);
 578                goto setup_ntlmv2_rsp_ret;
 579        }
 580        ses->auth_key.len += baselen;
 581
 582        buf = (struct ntlmv2_resp *)
 583                        (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 584        buf->blob_signature = cpu_to_le32(0x00000101);
 585        buf->reserved = 0;
 586        buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 587        get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 588        buf->reserved2 = 0;
 589
 590        memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 591
 592        /* calculate ntlmv2_hash */
 593        rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 594        if (rc) {
 595                cERROR(1, "could not get v2 hash rc %d", rc);
 596                goto setup_ntlmv2_rsp_ret;
 597        }
 598
 599        /* calculate first part of the client response (CR1) */
 600        rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 601        if (rc) {
 602                cERROR(1, "Could not calculate CR1  rc: %d", rc);
 603                goto setup_ntlmv2_rsp_ret;
 604        }
 605
 606        /* now calculate the session key for NTLMv2 */
 607        rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 608                ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 609        if (rc) {
 610                cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 611                goto setup_ntlmv2_rsp_ret;
 612        }
 613
 614        rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 615        if (rc) {
 616                cERROR(1, "%s: Could not init hmacmd5", __func__);
 617                goto setup_ntlmv2_rsp_ret;
 618        }
 619
 620        rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 621                ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 622                CIFS_HMAC_MD5_HASH_SIZE);
 623        if (rc) {
 624                cERROR(1, "%s: Could not update with response", __func__);
 625                goto setup_ntlmv2_rsp_ret;
 626        }
 627
 628        rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 629                ses->auth_key.response);
 630        if (rc)
 631                cERROR(1, "%s: Could not generate md5 hash", __func__);
 632
 633setup_ntlmv2_rsp_ret:
 634        kfree(tiblob);
 635
 636        return rc;
 637}
 638
 639int
 640calc_seckey(struct cifs_ses *ses)
 641{
 642        int rc;
 643        struct crypto_blkcipher *tfm_arc4;
 644        struct scatterlist sgin, sgout;
 645        struct blkcipher_desc desc;
 646        unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 647
 648        get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 649
 650        tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 651        if (IS_ERR(tfm_arc4)) {
 652                rc = PTR_ERR(tfm_arc4);
 653                cERROR(1, "could not allocate crypto API arc4");
 654                return rc;
 655        }
 656
 657        desc.tfm = tfm_arc4;
 658
 659        rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 660                                        CIFS_SESS_KEY_SIZE);
 661        if (rc) {
 662                cERROR(1, "%s: Could not set response as a key", __func__);
 663                return rc;
 664        }
 665
 666        sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 667        sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 668
 669        rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 670        if (rc) {
 671                cERROR(1, "could not encrypt session key rc: %d", rc);
 672                crypto_free_blkcipher(tfm_arc4);
 673                return rc;
 674        }
 675
 676        /* make secondary_key/nonce as session key */
 677        memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 678        /* and make len as that of session key only */
 679        ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 680
 681        crypto_free_blkcipher(tfm_arc4);
 682
 683        return rc;
 684}
 685
 686void
 687cifs_crypto_shash_release(struct TCP_Server_Info *server)
 688{
 689        if (server->secmech.md5)
 690                crypto_free_shash(server->secmech.md5);
 691
 692        if (server->secmech.hmacmd5)
 693                crypto_free_shash(server->secmech.hmacmd5);
 694
 695        kfree(server->secmech.sdeschmacmd5);
 696
 697        kfree(server->secmech.sdescmd5);
 698}
 699
 700int
 701cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
 702{
 703        int rc;
 704        unsigned int size;
 705
 706        server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 707        if (IS_ERR(server->secmech.hmacmd5)) {
 708                cERROR(1, "could not allocate crypto hmacmd5");
 709                return PTR_ERR(server->secmech.hmacmd5);
 710        }
 711
 712        server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
 713        if (IS_ERR(server->secmech.md5)) {
 714                cERROR(1, "could not allocate crypto md5");
 715                rc = PTR_ERR(server->secmech.md5);
 716                goto crypto_allocate_md5_fail;
 717        }
 718
 719        size = sizeof(struct shash_desc) +
 720                        crypto_shash_descsize(server->secmech.hmacmd5);
 721        server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 722        if (!server->secmech.sdeschmacmd5) {
 723                cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5");
 724                rc = -ENOMEM;
 725                goto crypto_allocate_hmacmd5_sdesc_fail;
 726        }
 727        server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 728        server->secmech.sdeschmacmd5->shash.flags = 0x0;
 729
 730
 731        size = sizeof(struct shash_desc) +
 732                        crypto_shash_descsize(server->secmech.md5);
 733        server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
 734        if (!server->secmech.sdescmd5) {
 735                cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5");
 736                rc = -ENOMEM;
 737                goto crypto_allocate_md5_sdesc_fail;
 738        }
 739        server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
 740        server->secmech.sdescmd5->shash.flags = 0x0;
 741
 742        return 0;
 743
 744crypto_allocate_md5_sdesc_fail:
 745        kfree(server->secmech.sdeschmacmd5);
 746
 747crypto_allocate_hmacmd5_sdesc_fail:
 748        crypto_free_shash(server->secmech.md5);
 749
 750crypto_allocate_md5_fail:
 751        crypto_free_shash(server->secmech.hmacmd5);
 752
 753        return rc;
 754}
 755
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