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#include <linux/highmem.h>
  33
  34/*
  35 * Calculate and return the CIFS signature based on the mac key and SMB PDU.
  36 * The 16 byte signature must be allocated by the caller. Note we only use the
  37 * 1st eight bytes and that the smb header signature field on input contains
  38 * the sequence number before this function is called. Also, this function
  39 * should be called with the server->srv_mutex held.
  40 */
  41static int cifs_calc_signature(struct smb_rqst *rqst,
  42                        struct TCP_Server_Info *server, char *signature)
  43{
  44        int i;
  45        int rc;
  46        struct kvec *iov = rqst->rq_iov;
  47        int n_vec = rqst->rq_nvec;
  48
  49        if (iov == NULL || signature == NULL || server == NULL)
  50                return -EINVAL;
  51
  52        if (!server->secmech.sdescmd5) {
  53                cERROR(1, "%s: Can't generate signature", __func__);
  54                return -1;
  55        }
  56
  57        rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
  58        if (rc) {
  59                cERROR(1, "%s: Could not init md5", __func__);
  60                return rc;
  61        }
  62
  63        rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
  64                server->session_key.response, server->session_key.len);
  65        if (rc) {
  66                cERROR(1, "%s: Could not update with response", __func__);
  67                return rc;
  68        }
  69
  70        for (i = 0; i < n_vec; i++) {
  71                if (iov[i].iov_len == 0)
  72                        continue;
  73                if (iov[i].iov_base == NULL) {
  74                        cERROR(1, "null iovec entry");
  75                        return -EIO;
  76                }
  77                /* The first entry includes a length field (which does not get
  78                   signed that occupies the first 4 bytes before the header */
  79                if (i == 0) {
  80                        if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
  81                                break; /* nothing to sign or corrupt header */
  82                        rc =
  83                        crypto_shash_update(&server->secmech.sdescmd5->shash,
  84                                iov[i].iov_base + 4, iov[i].iov_len - 4);
  85                } else {
  86                        rc =
  87                        crypto_shash_update(&server->secmech.sdescmd5->shash,
  88                                iov[i].iov_base, iov[i].iov_len);
  89                }
  90                if (rc) {
  91                        cERROR(1, "%s: Could not update with payload",
  92                                                        __func__);
  93                        return rc;
  94                }
  95        }
  96
  97        /* now hash over the rq_pages array */
  98        for (i = 0; i < rqst->rq_npages; i++) {
  99                struct kvec p_iov;
 100
 101                cifs_rqst_page_to_kvec(rqst, i, &p_iov);
 102                crypto_shash_update(&server->secmech.sdescmd5->shash,
 103                                        p_iov.iov_base, p_iov.iov_len);
 104                kunmap(rqst->rq_pages[i]);
 105        }
 106
 107        rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
 108        if (rc)
 109                cERROR(1, "%s: Could not generate md5 hash", __func__);
 110
 111        return rc;
 112}
 113
 114/* must be called with server->srv_mutex held */
 115int cifs_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server,
 116                   __u32 *pexpected_response_sequence_number)
 117{
 118        int rc = 0;
 119        char smb_signature[20];
 120        struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 121
 122        if ((cifs_pdu == NULL) || (server == NULL))
 123                return -EINVAL;
 124
 125        if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
 126            server->tcpStatus == CifsNeedNegotiate)
 127                return rc;
 128
 129        if (!server->session_estab) {
 130                memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
 131                return rc;
 132        }
 133
 134        cifs_pdu->Signature.Sequence.SequenceNumber =
 135                                cpu_to_le32(server->sequence_number);
 136        cifs_pdu->Signature.Sequence.Reserved = 0;
 137
 138        *pexpected_response_sequence_number = server->sequence_number++;
 139        server->sequence_number++;
 140
 141        rc = cifs_calc_signature(rqst, server, smb_signature);
 142        if (rc)
 143                memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
 144        else
 145                memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
 146
 147        return rc;
 148}
 149
 150int cifs_sign_smbv(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 151                   __u32 *pexpected_response_sequence)
 152{
 153        struct smb_rqst rqst = { .rq_iov = iov,
 154                                 .rq_nvec = n_vec };
 155
 156        return cifs_sign_rqst(&rqst, server, pexpected_response_sequence);
 157}
 158
 159/* must be called with server->srv_mutex held */
 160int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 161                  __u32 *pexpected_response_sequence_number)
 162{
 163        struct kvec iov;
 164
 165        iov.iov_base = cifs_pdu;
 166        iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
 167
 168        return cifs_sign_smbv(&iov, 1, server,
 169                              pexpected_response_sequence_number);
 170}
 171
 172int cifs_verify_signature(struct smb_rqst *rqst,
 173                          struct TCP_Server_Info *server,
 174                          __u32 expected_sequence_number)
 175{
 176        unsigned int rc;
 177        char server_response_sig[8];
 178        char what_we_think_sig_should_be[20];
 179        struct smb_hdr *cifs_pdu = (struct smb_hdr *)rqst->rq_iov[0].iov_base;
 180
 181        if (cifs_pdu == NULL || server == NULL)
 182                return -EINVAL;
 183
 184        if (!server->session_estab)
 185                return 0;
 186
 187        if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
 188                struct smb_com_lock_req *pSMB =
 189                        (struct smb_com_lock_req *)cifs_pdu;
 190            if (pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
 191                        return 0;
 192        }
 193
 194        /* BB what if signatures are supposed to be on for session but
 195           server does not send one? BB */
 196
 197        /* Do not need to verify session setups with signature "BSRSPYL "  */
 198        if (memcmp(cifs_pdu->Signature.SecuritySignature, "BSRSPYL ", 8) == 0)
 199                cFYI(1, "dummy signature received for smb command 0x%x",
 200                        cifs_pdu->Command);
 201
 202        /* save off the origiginal signature so we can modify the smb and check
 203                its signature against what the server sent */
 204        memcpy(server_response_sig, cifs_pdu->Signature.SecuritySignature, 8);
 205
 206        cifs_pdu->Signature.Sequence.SequenceNumber =
 207                                        cpu_to_le32(expected_sequence_number);
 208        cifs_pdu->Signature.Sequence.Reserved = 0;
 209
 210        mutex_lock(&server->srv_mutex);
 211        rc = cifs_calc_signature(rqst, server, what_we_think_sig_should_be);
 212        mutex_unlock(&server->srv_mutex);
 213
 214        if (rc)
 215                return rc;
 216
 217/*      cifs_dump_mem("what we think it should be: ",
 218                      what_we_think_sig_should_be, 16); */
 219
 220        if (memcmp(server_response_sig, what_we_think_sig_should_be, 8))
 221                return -EACCES;
 222        else
 223                return 0;
 224
 225}
 226
 227/* first calculate 24 bytes ntlm response and then 16 byte session key */
 228int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
 229{
 230        int rc = 0;
 231        unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
 232        char temp_key[CIFS_SESS_KEY_SIZE];
 233
 234        if (!ses)
 235                return -EINVAL;
 236
 237        ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
 238        if (!ses->auth_key.response) {
 239                cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
 240                return -ENOMEM;
 241        }
 242        ses->auth_key.len = temp_len;
 243
 244        rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
 245                        ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
 246        if (rc) {
 247                cFYI(1, "%s Can't generate NTLM response, error: %d",
 248                        __func__, rc);
 249                return rc;
 250        }
 251
 252        rc = E_md4hash(ses->password, temp_key, nls_cp);
 253        if (rc) {
 254                cFYI(1, "%s Can't generate NT hash, error: %d", __func__, rc);
 255                return rc;
 256        }
 257
 258        rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
 259        if (rc)
 260                cFYI(1, "%s Can't generate NTLM session key, error: %d",
 261                        __func__, rc);
 262
 263        return rc;
 264}
 265
 266#ifdef CONFIG_CIFS_WEAK_PW_HASH
 267int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
 268                        char *lnm_session_key)
 269{
 270        int i;
 271        int rc;
 272        char password_with_pad[CIFS_ENCPWD_SIZE];
 273
 274        memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 275        if (password)
 276                strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 277
 278        if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
 279                memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 280                memcpy(lnm_session_key, password_with_pad,
 281                        CIFS_ENCPWD_SIZE);
 282                return 0;
 283        }
 284
 285        /* calculate old style session key */
 286        /* calling toupper is less broken than repeatedly
 287        calling nls_toupper would be since that will never
 288        work for UTF8, but neither handles multibyte code pages
 289        but the only alternative would be converting to UCS-16 (Unicode)
 290        (using a routine something like UniStrupr) then
 291        uppercasing and then converting back from Unicode - which
 292        would only worth doing it if we knew it were utf8. Basically
 293        utf8 and other multibyte codepages each need their own strupper
 294        function since a byte at a time will ont work. */
 295
 296        for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 297                password_with_pad[i] = toupper(password_with_pad[i]);
 298
 299        rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
 300
 301        return rc;
 302}
 303#endif /* CIFS_WEAK_PW_HASH */
 304
 305/* Build a proper attribute value/target info pairs blob.
 306 * Fill in netbios and dns domain name and workstation name
 307 * and client time (total five av pairs and + one end of fields indicator.
 308 * Allocate domain name which gets freed when session struct is deallocated.
 309 */
 310static int
 311build_avpair_blob(struct cifs_ses *ses, const struct nls_table *nls_cp)
 312{
 313        unsigned int dlen;
 314        unsigned int size = 2 * sizeof(struct ntlmssp2_name);
 315        char *defdmname = "WORKGROUP";
 316        unsigned char *blobptr;
 317        struct ntlmssp2_name *attrptr;
 318
 319        if (!ses->domainName) {
 320                ses->domainName = kstrdup(defdmname, GFP_KERNEL);
 321                if (!ses->domainName)
 322                        return -ENOMEM;
 323        }
 324
 325        dlen = strlen(ses->domainName);
 326
 327        /*
 328         * The length of this blob is two times the size of a
 329         * structure (av pair) which holds name/size
 330         * ( for NTLMSSP_AV_NB_DOMAIN_NAME followed by NTLMSSP_AV_EOL ) +
 331         * unicode length of a netbios domain name
 332         */
 333        ses->auth_key.len = size + 2 * dlen;
 334        ses->auth_key.response = kzalloc(ses->auth_key.len, GFP_KERNEL);
 335        if (!ses->auth_key.response) {
 336                ses->auth_key.len = 0;
 337                cERROR(1, "Challenge target info allocation failure");
 338                return -ENOMEM;
 339        }
 340
 341        blobptr = ses->auth_key.response;
 342        attrptr = (struct ntlmssp2_name *) blobptr;
 343
 344        /*
 345         * As defined in MS-NTLM 3.3.2, just this av pair field
 346         * is sufficient as part of the temp
 347         */
 348        attrptr->type = cpu_to_le16(NTLMSSP_AV_NB_DOMAIN_NAME);
 349        attrptr->length = cpu_to_le16(2 * dlen);
 350        blobptr = (unsigned char *)attrptr + sizeof(struct ntlmssp2_name);
 351        cifs_strtoUTF16((__le16 *)blobptr, ses->domainName, dlen, nls_cp);
 352
 353        return 0;
 354}
 355
 356/* Server has provided av pairs/target info in the type 2 challenge
 357 * packet and we have plucked it and stored within smb session.
 358 * We parse that blob here to find netbios domain name to be used
 359 * as part of ntlmv2 authentication (in Target String), if not already
 360 * specified on the command line.
 361 * If this function returns without any error but without fetching
 362 * domain name, authentication may fail against some server but
 363 * may not fail against other (those who are not very particular
 364 * about target string i.e. for some, just user name might suffice.
 365 */
 366static int
 367find_domain_name(struct cifs_ses *ses, const struct nls_table *nls_cp)
 368{
 369        unsigned int attrsize;
 370        unsigned int type;
 371        unsigned int onesize = sizeof(struct ntlmssp2_name);
 372        unsigned char *blobptr;
 373        unsigned char *blobend;
 374        struct ntlmssp2_name *attrptr;
 375
 376        if (!ses->auth_key.len || !ses->auth_key.response)
 377                return 0;
 378
 379        blobptr = ses->auth_key.response;
 380        blobend = blobptr + ses->auth_key.len;
 381
 382        while (blobptr + onesize < blobend) {
 383                attrptr = (struct ntlmssp2_name *) blobptr;
 384                type = le16_to_cpu(attrptr->type);
 385                if (type == NTLMSSP_AV_EOL)
 386                        break;
 387                blobptr += 2; /* advance attr type */
 388                attrsize = le16_to_cpu(attrptr->length);
 389                blobptr += 2; /* advance attr size */
 390                if (blobptr + attrsize > blobend)
 391                        break;
 392                if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
 393                        if (!attrsize)
 394                                break;
 395                        if (!ses->domainName) {
 396                                ses->domainName =
 397                                        kmalloc(attrsize + 1, GFP_KERNEL);
 398                                if (!ses->domainName)
 399                                                return -ENOMEM;
 400                                cifs_from_utf16(ses->domainName,
 401                                        (__le16 *)blobptr, attrsize, attrsize,
 402                                        nls_cp, false);
 403                                break;
 404                        }
 405                }
 406                blobptr += attrsize; /* advance attr  value */
 407        }
 408
 409        return 0;
 410}
 411
 412static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
 413                            const struct nls_table *nls_cp)
 414{
 415        int rc = 0;
 416        int len;
 417        char nt_hash[CIFS_NTHASH_SIZE];
 418        wchar_t *user;
 419        wchar_t *domain;
 420        wchar_t *server;
 421
 422        if (!ses->server->secmech.sdeschmacmd5) {
 423                cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash");
 424                return -1;
 425        }
 426
 427        /* calculate md4 hash of password */
 428        E_md4hash(ses->password, nt_hash, nls_cp);
 429
 430        rc = crypto_shash_setkey(ses->server->secmech.hmacmd5, nt_hash,
 431                                CIFS_NTHASH_SIZE);
 432        if (rc) {
 433                cERROR(1, "%s: Could not set NT Hash as a key", __func__);
 434                return rc;
 435        }
 436
 437        rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 438        if (rc) {
 439                cERROR(1, "calc_ntlmv2_hash: could not init hmacmd5");
 440                return rc;
 441        }
 442
 443        /* convert ses->user_name to unicode and uppercase */
 444        len = ses->user_name ? strlen(ses->user_name) : 0;
 445        user = kmalloc(2 + (len * 2), GFP_KERNEL);
 446        if (user == NULL) {
 447                cERROR(1, "calc_ntlmv2_hash: user mem alloc failure");
 448                rc = -ENOMEM;
 449                return rc;
 450        }
 451
 452        if (len) {
 453                len = cifs_strtoUTF16((__le16 *)user, ses->user_name, len, nls_cp);
 454                UniStrupr(user);
 455        } else {
 456                memset(user, '\0', 2);
 457        }
 458
 459        rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 460                                (char *)user, 2 * len);
 461        kfree(user);
 462        if (rc) {
 463                cERROR(1, "%s: Could not update with user", __func__);
 464                return rc;
 465        }
 466
 467        /* convert ses->domainName to unicode and uppercase */
 468        if (ses->domainName) {
 469                len = strlen(ses->domainName);
 470
 471                domain = kmalloc(2 + (len * 2), GFP_KERNEL);
 472                if (domain == NULL) {
 473                        cERROR(1, "calc_ntlmv2_hash: domain mem alloc failure");
 474                        rc = -ENOMEM;
 475                        return rc;
 476                }
 477                len = cifs_strtoUTF16((__le16 *)domain, ses->domainName, len,
 478                                      nls_cp);
 479                rc =
 480                crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 481                                        (char *)domain, 2 * len);
 482                kfree(domain);
 483                if (rc) {
 484                        cERROR(1, "%s: Could not update with domain",
 485                                                                __func__);
 486                        return rc;
 487                }
 488        } else if (ses->serverName) {
 489                len = strlen(ses->serverName);
 490
 491                server = kmalloc(2 + (len * 2), GFP_KERNEL);
 492                if (server == NULL) {
 493                        cERROR(1, "calc_ntlmv2_hash: server mem alloc failure");
 494                        rc = -ENOMEM;
 495                        return rc;
 496                }
 497                len = cifs_strtoUTF16((__le16 *)server, ses->serverName, len,
 498                                        nls_cp);
 499                rc =
 500                crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 501                                        (char *)server, 2 * len);
 502                kfree(server);
 503                if (rc) {
 504                        cERROR(1, "%s: Could not update with server",
 505                                                                __func__);
 506                        return rc;
 507                }
 508        }
 509
 510        rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 511                                        ntlmv2_hash);
 512        if (rc)
 513                cERROR(1, "%s: Could not generate md5 hash", __func__);
 514
 515        return rc;
 516}
 517
 518static int
 519CalcNTLMv2_response(const struct cifs_ses *ses, char *ntlmv2_hash)
 520{
 521        int rc;
 522        unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
 523
 524        if (!ses->server->secmech.sdeschmacmd5) {
 525                cERROR(1, "calc_ntlmv2_hash: can't generate ntlmv2 hash");
 526                return -1;
 527        }
 528
 529        rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 530                                ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 531        if (rc) {
 532                cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 533                return rc;
 534        }
 535
 536        rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 537        if (rc) {
 538                cERROR(1, "CalcNTLMv2_response: could not init hmacmd5");
 539                return rc;
 540        }
 541
 542        if (ses->server->secType == RawNTLMSSP)
 543                memcpy(ses->auth_key.response + offset,
 544                        ses->ntlmssp->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 545        else
 546                memcpy(ses->auth_key.response + offset,
 547                        ses->server->cryptkey, CIFS_SERVER_CHALLENGE_SIZE);
 548        rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 549                ses->auth_key.response + offset, ses->auth_key.len - offset);
 550        if (rc) {
 551                cERROR(1, "%s: Could not update with response", __func__);
 552                return rc;
 553        }
 554
 555        rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 556                ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 557        if (rc)
 558                cERROR(1, "%s: Could not generate md5 hash", __func__);
 559
 560        return rc;
 561}
 562
 563
 564int
 565setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
 566{
 567        int rc;
 568        int baselen;
 569        unsigned int tilen;
 570        struct ntlmv2_resp *buf;
 571        char ntlmv2_hash[16];
 572        unsigned char *tiblob = NULL; /* target info blob */
 573
 574        if (ses->server->secType == RawNTLMSSP) {
 575                if (!ses->domainName) {
 576                        rc = find_domain_name(ses, nls_cp);
 577                        if (rc) {
 578                                cERROR(1, "error %d finding domain name", rc);
 579                                goto setup_ntlmv2_rsp_ret;
 580                        }
 581                }
 582        } else {
 583                rc = build_avpair_blob(ses, nls_cp);
 584                if (rc) {
 585                        cERROR(1, "error %d building av pair blob", rc);
 586                        goto setup_ntlmv2_rsp_ret;
 587                }
 588        }
 589
 590        baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
 591        tilen = ses->auth_key.len;
 592        tiblob = ses->auth_key.response;
 593
 594        ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
 595        if (!ses->auth_key.response) {
 596                rc = ENOMEM;
 597                ses->auth_key.len = 0;
 598                cERROR(1, "%s: Can't allocate auth blob", __func__);
 599                goto setup_ntlmv2_rsp_ret;
 600        }
 601        ses->auth_key.len += baselen;
 602
 603        buf = (struct ntlmv2_resp *)
 604                        (ses->auth_key.response + CIFS_SESS_KEY_SIZE);
 605        buf->blob_signature = cpu_to_le32(0x00000101);
 606        buf->reserved = 0;
 607        buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
 608        get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
 609        buf->reserved2 = 0;
 610
 611        memcpy(ses->auth_key.response + baselen, tiblob, tilen);
 612
 613        /* calculate ntlmv2_hash */
 614        rc = calc_ntlmv2_hash(ses, ntlmv2_hash, nls_cp);
 615        if (rc) {
 616                cERROR(1, "could not get v2 hash rc %d", rc);
 617                goto setup_ntlmv2_rsp_ret;
 618        }
 619
 620        /* calculate first part of the client response (CR1) */
 621        rc = CalcNTLMv2_response(ses, ntlmv2_hash);
 622        if (rc) {
 623                cERROR(1, "Could not calculate CR1  rc: %d", rc);
 624                goto setup_ntlmv2_rsp_ret;
 625        }
 626
 627        /* now calculate the session key for NTLMv2 */
 628        rc = crypto_shash_setkey(ses->server->secmech.hmacmd5,
 629                ntlmv2_hash, CIFS_HMAC_MD5_HASH_SIZE);
 630        if (rc) {
 631                cERROR(1, "%s: Could not set NTLMV2 Hash as a key", __func__);
 632                goto setup_ntlmv2_rsp_ret;
 633        }
 634
 635        rc = crypto_shash_init(&ses->server->secmech.sdeschmacmd5->shash);
 636        if (rc) {
 637                cERROR(1, "%s: Could not init hmacmd5", __func__);
 638                goto setup_ntlmv2_rsp_ret;
 639        }
 640
 641        rc = crypto_shash_update(&ses->server->secmech.sdeschmacmd5->shash,
 642                ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 643                CIFS_HMAC_MD5_HASH_SIZE);
 644        if (rc) {
 645                cERROR(1, "%s: Could not update with response", __func__);
 646                goto setup_ntlmv2_rsp_ret;
 647        }
 648
 649        rc = crypto_shash_final(&ses->server->secmech.sdeschmacmd5->shash,
 650                ses->auth_key.response);
 651        if (rc)
 652                cERROR(1, "%s: Could not generate md5 hash", __func__);
 653
 654setup_ntlmv2_rsp_ret:
 655        kfree(tiblob);
 656
 657        return rc;
 658}
 659
 660int
 661calc_seckey(struct cifs_ses *ses)
 662{
 663        int rc;
 664        struct crypto_blkcipher *tfm_arc4;
 665        struct scatterlist sgin, sgout;
 666        struct blkcipher_desc desc;
 667        unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
 668
 669        get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
 670
 671        tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
 672        if (IS_ERR(tfm_arc4)) {
 673                rc = PTR_ERR(tfm_arc4);
 674                cERROR(1, "could not allocate crypto API arc4");
 675                return rc;
 676        }
 677
 678        desc.tfm = tfm_arc4;
 679
 680        rc = crypto_blkcipher_setkey(tfm_arc4, ses->auth_key.response,
 681                                        CIFS_SESS_KEY_SIZE);
 682        if (rc) {
 683                cERROR(1, "%s: Could not set response as a key", __func__);
 684                return rc;
 685        }
 686
 687        sg_init_one(&sgin, sec_key, CIFS_SESS_KEY_SIZE);
 688        sg_init_one(&sgout, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
 689
 690        rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
 691        if (rc) {
 692                cERROR(1, "could not encrypt session key rc: %d", rc);
 693                crypto_free_blkcipher(tfm_arc4);
 694                return rc;
 695        }
 696
 697        /* make secondary_key/nonce as session key */
 698        memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);
 699        /* and make len as that of session key only */
 700        ses->auth_key.len = CIFS_SESS_KEY_SIZE;
 701
 702        crypto_free_blkcipher(tfm_arc4);
 703
 704        return rc;
 705}
 706
 707void
 708cifs_crypto_shash_release(struct TCP_Server_Info *server)
 709{
 710        if (server->secmech.hmacsha256)
 711                crypto_free_shash(server->secmech.hmacsha256);
 712
 713        if (server->secmech.md5)
 714                crypto_free_shash(server->secmech.md5);
 715
 716        if (server->secmech.hmacmd5)
 717                crypto_free_shash(server->secmech.hmacmd5);
 718
 719        kfree(server->secmech.sdeschmacsha256);
 720
 721        kfree(server->secmech.sdeschmacmd5);
 722
 723        kfree(server->secmech.sdescmd5);
 724}
 725
 726int
 727cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
 728{
 729        int rc;
 730        unsigned int size;
 731
 732        server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
 733        if (IS_ERR(server->secmech.hmacmd5)) {
 734                cERROR(1, "could not allocate crypto hmacmd5");
 735                return PTR_ERR(server->secmech.hmacmd5);
 736        }
 737
 738        server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
 739        if (IS_ERR(server->secmech.md5)) {
 740                cERROR(1, "could not allocate crypto md5");
 741                rc = PTR_ERR(server->secmech.md5);
 742                goto crypto_allocate_md5_fail;
 743        }
 744
 745        server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0);
 746        if (IS_ERR(server->secmech.hmacsha256)) {
 747                cERROR(1, "could not allocate crypto hmacsha256\n");
 748                rc = PTR_ERR(server->secmech.hmacsha256);
 749                goto crypto_allocate_hmacsha256_fail;
 750        }
 751
 752        size = sizeof(struct shash_desc) +
 753                        crypto_shash_descsize(server->secmech.hmacmd5);
 754        server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
 755        if (!server->secmech.sdeschmacmd5) {
 756                cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5");
 757                rc = -ENOMEM;
 758                goto crypto_allocate_hmacmd5_sdesc_fail;
 759        }
 760        server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
 761        server->secmech.sdeschmacmd5->shash.flags = 0x0;
 762
 763        size = sizeof(struct shash_desc) +
 764                        crypto_shash_descsize(server->secmech.md5);
 765        server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
 766        if (!server->secmech.sdescmd5) {
 767                cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5");
 768                rc = -ENOMEM;
 769                goto crypto_allocate_md5_sdesc_fail;
 770        }
 771        server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
 772        server->secmech.sdescmd5->shash.flags = 0x0;
 773
 774        size = sizeof(struct shash_desc) +
 775                        crypto_shash_descsize(server->secmech.hmacsha256);
 776        server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL);
 777        if (!server->secmech.sdeschmacsha256) {
 778                cERROR(1, "%s: Can't alloc hmacsha256\n", __func__);
 779                rc = -ENOMEM;
 780                goto crypto_allocate_hmacsha256_sdesc_fail;
 781        }
 782        server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256;
 783        server->secmech.sdeschmacsha256->shash.flags = 0x0;
 784
 785        return 0;
 786
 787crypto_allocate_hmacsha256_sdesc_fail:
 788        kfree(server->secmech.sdescmd5);
 789
 790crypto_allocate_md5_sdesc_fail:
 791        kfree(server->secmech.sdeschmacmd5);
 792
 793crypto_allocate_hmacmd5_sdesc_fail:
 794        crypto_free_shash(server->secmech.hmacsha256);
 795
 796crypto_allocate_hmacsha256_fail:
 797        crypto_free_shash(server->secmech.md5);
 798
 799crypto_allocate_md5_fail:
 800        crypto_free_shash(server->secmech.hmacmd5);
 801
 802        return rc;
 803}
 804
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