fs/cifs/smb2transport.c

   1 /*
   2  *   fs/cifs/smb2transport.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002, 2011
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Jeremy Allison (jra@samba.org) 2006
   8  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   9  *
  10  *   This library is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU Lesser General Public License as published
  12  *   by the Free Software Foundation; either version 2.1 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This library is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  18  *   the GNU Lesser General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU Lesser General Public License
  21  *   along with this library; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #include <linux/fs.h>
  26 #include <linux/list.h>
  27 #include <linux/wait.h>
  28 #include <linux/net.h>
  29 #include <linux/delay.h>
  30 #include <linux/uaccess.h>
  31 #include <asm/processor.h>
  32 #include <linux/mempool.h>
  33 #include <linux/highmem.h>
  34 #include <crypto/aead.h>
  35 #include "smb2pdu.h"
  36 #include "cifsglob.h"
  37 #include "cifsproto.h"
  38 #include "smb2proto.h"
  39 #include "cifs_debug.h"
  40 #include "smb2status.h"
  41 #include "smb2glob.h"
  42
  43 static int
  44 smb2_crypto_shash_allocate(struct TCP_Server_Info *server)
  45 {
  46         return cifs_alloc_hash("hmac(sha256)",
  47                                &server->secmech.hmacsha256,
  48                                &server->secmech.sdeschmacsha256);
  49 }
  50
  51 static int
  52 smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
  53 {
  54         struct cifs_secmech *p = &server->secmech;
  55         int rc;
  56
  57         rc = cifs_alloc_hash("hmac(sha256)",
  58                              &p->hmacsha256,
  59                              &p->sdeschmacsha256);
  60         if (rc)
  61                 goto err;
  62
  63         rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
  64         if (rc)
  65                 goto err;
  66
  67         return 0;
  68 err:
  69         cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
  70         return rc;
  71 }
  72
  73 #ifdef CONFIG_CIFS_SMB311
  74 int
  75 smb311_crypto_shash_allocate(struct TCP_Server_Info *server)
  76 {
  77         struct cifs_secmech *p = &server->secmech;
  78         int rc = 0;
  79
  80         rc = cifs_alloc_hash("hmac(sha256)",
  81                              &p->hmacsha256,
  82                              &p->sdeschmacsha256);
  83         if (rc)
  84                 return rc;
  85
  86         rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
  87         if (rc)
  88                 goto err;
  89
  90         rc = cifs_alloc_hash("sha512", &p->sha512, &p->sdescsha512);
  91         if (rc)
  92                 goto err;
  93
  94         return 0;
  95
  96 err:
  97         cifs_free_hash(&p->cmacaes, &p->sdesccmacaes);
  98         cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
  99         return rc;
 100 }
 101 #endif
 102
 103 static struct cifs_ses *
 104 smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
 105 {
 106         struct cifs_ses *ses;
 107
 108         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
 109                 if (ses->Suid != ses_id)
 110                         continue;
 111                 return ses;
 112         }
 113
 114         return NULL;
 115 }
 116
 117 struct cifs_ses *
 118 smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
 119 {
 120         struct cifs_ses *ses;
 121
 122         spin_lock(&cifs_tcp_ses_lock);
 123         ses = smb2_find_smb_ses_unlocked(server, ses_id);
 124         spin_unlock(&cifs_tcp_ses_lock);
 125
 126         return ses;
 127 }
 128
 129 static struct cifs_tcon *
 130 smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32  tid)
 131 {
 132         struct cifs_tcon *tcon;
 133
 134         list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
 135                 if (tcon->tid != tid)
 136                         continue;
 137                 ++tcon->tc_count;
 138                 return tcon;
 139         }
 140
 141         return NULL;
 142 }
 143
 144 /*
 145  * Obtain tcon corresponding to the tid in the given
 146  * cifs_ses
 147  */
 148
 149 struct cifs_tcon *
 150 smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32  tid)
 151 {
 152         struct cifs_ses *ses;
 153         struct cifs_tcon *tcon;
 154
 155         spin_lock(&cifs_tcp_ses_lock);
 156         ses = smb2_find_smb_ses_unlocked(server, ses_id);
 157         if (!ses) {
 158                 spin_unlock(&cifs_tcp_ses_lock);
 159                 return NULL;
 160         }
 161         tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid);
 162         spin_unlock(&cifs_tcp_ses_lock);
 163
 164         return tcon;
 165 }
 166
 167 int
 168 smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 169 {
 170         int rc;
 171         unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
 172         unsigned char *sigptr = smb2_signature;
 173         struct kvec *iov = rqst->rq_iov;
 174         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
 175         struct cifs_ses *ses;
 176
 177         ses = smb2_find_smb_ses(server, shdr->SessionId);
 178         if (!ses) {
 179                 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
 180                 return 0;
 181         }
 182
 183         memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
 184         memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
 185
 186         rc = smb2_crypto_shash_allocate(server);
 187         if (rc) {
 188                 cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
 189                 return rc;
 190         }
 191
 192         rc = crypto_shash_setkey(server->secmech.hmacsha256,
 193                 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
 194         if (rc) {
 195                 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
 196                 return rc;
 197         }
 198
 199         rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
 200         if (rc) {
 201                 cifs_dbg(VFS, "%s: Could not init sha256", __func__);
 202                 return rc;
 203         }
 204
 205         rc = __cifs_calc_signature(rqst, server, sigptr,
 206                 &server->secmech.sdeschmacsha256->shash);
 207
 208         if (!rc)
 209                 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
 210
 211         return rc;
 212 }
 213
 214 static int generate_key(struct cifs_ses *ses, struct kvec label,
 215                         struct kvec context, __u8 *key, unsigned int key_size)
 216 {
 217         unsigned char zero = 0x0;
 218         __u8 i[4] = {0, 0, 0, 1};
 219         __u8 L[4] = {0, 0, 0, 128};
 220         int rc = 0;
 221         unsigned char prfhash[SMB2_HMACSHA256_SIZE];
 222         unsigned char *hashptr = prfhash;
 223
 224         memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
 225         memset(key, 0x0, key_size);
 226
 227         rc = smb3_crypto_shash_allocate(ses->server);
 228         if (rc) {
 229                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
 230                 goto smb3signkey_ret;
 231         }
 232
 233         rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
 234                 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
 235         if (rc) {
 236                 cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
 237                 goto smb3signkey_ret;
 238         }
 239
 240         rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
 241         if (rc) {
 242                 cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
 243                 goto smb3signkey_ret;
 244         }
 245
 246         rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
 247                                 i, 4);
 248         if (rc) {
 249                 cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
 250                 goto smb3signkey_ret;
 251         }
 252
 253         rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
 254                                 label.iov_base, label.iov_len);
 255         if (rc) {
 256                 cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
 257                 goto smb3signkey_ret;
 258         }
 259
 260         rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
 261                                 &zero, 1);
 262         if (rc) {
 263                 cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
 264                 goto smb3signkey_ret;
 265         }
 266
 267         rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
 268                                 context.iov_base, context.iov_len);
 269         if (rc) {
 270                 cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
 271                 goto smb3signkey_ret;
 272         }
 273
 274         rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
 275                                 L, 4);
 276         if (rc) {
 277                 cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
 278                 goto smb3signkey_ret;
 279         }
 280
 281         rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
 282                                 hashptr);
 283         if (rc) {
 284                 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
 285                 goto smb3signkey_ret;
 286         }
 287
 288         memcpy(key, hashptr, key_size);
 289
 290 smb3signkey_ret:
 291         return rc;
 292 }
 293
 294 struct derivation {
 295         struct kvec label;
 296         struct kvec context;
 297 };
 298
 299 struct derivation_triplet {
 300         struct derivation signing;
 301         struct derivation encryption;
 302         struct derivation decryption;
 303 };
 304
 305 static int
 306 generate_smb3signingkey(struct cifs_ses *ses,
 307                         const struct derivation_triplet *ptriplet)
 308 {
 309         int rc;
 310
 311         rc = generate_key(ses, ptriplet->signing.label,
 312                           ptriplet->signing.context, ses->smb3signingkey,
 313                           SMB3_SIGN_KEY_SIZE);
 314         if (rc)
 315                 return rc;
 316
 317         rc = generate_key(ses, ptriplet->encryption.label,
 318                           ptriplet->encryption.context, ses->smb3encryptionkey,
 319                           SMB3_SIGN_KEY_SIZE);
 320         if (rc)
 321                 return rc;
 322
 323         rc = generate_key(ses, ptriplet->decryption.label,
 324                           ptriplet->decryption.context,
 325                           ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
 326
 327         if (rc)
 328                 return rc;
 329
 330 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
 331         cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
 332         /*
 333          * The session id is opaque in terms of endianness, so we can't
 334          * print it as a long long. we dump it as we got it on the wire
 335          */
 336         cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
 337                         &ses->Suid);
 338         cifs_dbg(VFS, "Session Key   %*ph\n",
 339                  SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
 340         cifs_dbg(VFS, "Signing Key   %*ph\n",
 341                  SMB3_SIGN_KEY_SIZE, ses->smb3signingkey);
 342         cifs_dbg(VFS, "ServerIn Key  %*ph\n",
 343                  SMB3_SIGN_KEY_SIZE, ses->smb3encryptionkey);
 344         cifs_dbg(VFS, "ServerOut Key %*ph\n",
 345                  SMB3_SIGN_KEY_SIZE, ses->smb3decryptionkey);
 346 #endif
 347         return rc;
 348 }
 349
 350 int
 351 generate_smb30signingkey(struct cifs_ses *ses)
 352
 353 {
 354         struct derivation_triplet triplet;
 355         struct derivation *d;
 356
 357         d = &triplet.signing;
 358         d->label.iov_base = "SMB2AESCMAC";
 359         d->label.iov_len = 12;
 360         d->context.iov_base = "SmbSign";
 361         d->context.iov_len = 8;
 362
 363         d = &triplet.encryption;
 364         d->label.iov_base = "SMB2AESCCM";
 365         d->label.iov_len = 11;
 366         d->context.iov_base = "ServerIn ";
 367         d->context.iov_len = 10;
 368
 369         d = &triplet.decryption;
 370         d->label.iov_base = "SMB2AESCCM";
 371         d->label.iov_len = 11;
 372         d->context.iov_base = "ServerOut";
 373         d->context.iov_len = 10;
 374
 375         return generate_smb3signingkey(ses, &triplet);
 376 }
 377
 378 #ifdef CONFIG_CIFS_SMB311
 379 int
 380 generate_smb311signingkey(struct cifs_ses *ses)
 381
 382 {
 383         struct derivation_triplet triplet;
 384         struct derivation *d;
 385
 386         d = &triplet.signing;
 387         d->label.iov_base = "SMBSigningKey";
 388         d->label.iov_len = 14;
 389         d->context.iov_base = ses->preauth_sha_hash;
 390         d->context.iov_len = 64;
 391
 392         d = &triplet.encryption;
 393         d->label.iov_base = "SMBC2SCipherKey";
 394         d->label.iov_len = 16;
 395         d->context.iov_base = ses->preauth_sha_hash;
 396         d->context.iov_len = 64;
 397
 398         d = &triplet.decryption;
 399         d->label.iov_base = "SMBS2CCipherKey";
 400         d->label.iov_len = 16;
 401         d->context.iov_base = ses->preauth_sha_hash;
 402         d->context.iov_len = 64;
 403
 404         return generate_smb3signingkey(ses, &triplet);
 405 }
 406 #endif /* 311 */
 407
 408 int
 409 smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 410 {
 411         int rc = 0;
 412         unsigned char smb3_signature[SMB2_CMACAES_SIZE];
 413         unsigned char *sigptr = smb3_signature;
 414         struct kvec *iov = rqst->rq_iov;
 415         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
 416         struct cifs_ses *ses;
 417
 418         ses = smb2_find_smb_ses(server, shdr->SessionId);
 419         if (!ses) {
 420                 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
 421                 return 0;
 422         }
 423
 424         memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
 425         memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
 426
 427         rc = crypto_shash_setkey(server->secmech.cmacaes,
 428                 ses->smb3signingkey, SMB2_CMACAES_SIZE);
 429
 430         if (rc) {
 431                 cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
 432                 return rc;
 433         }
 434
 435         /*
 436          * we already allocate sdesccmacaes when we init smb3 signing key,
 437          * so unlike smb2 case we do not have to check here if secmech are
 438          * initialized
 439          */
 440         rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash);
 441         if (rc) {
 442                 cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
 443                 return rc;
 444         }
 445
 446         rc = __cifs_calc_signature(rqst, server, sigptr,
 447                                    &server->secmech.sdesccmacaes->shash);
 448
 449         if (!rc)
 450                 memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
 451
 452         return rc;
 453 }
 454
 455 /* must be called with server->srv_mutex held */
 456 static int
 457 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 458 {
 459         int rc = 0;
 460         struct smb2_sync_hdr *shdr =
 461                         (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
 462
 463         if (!(shdr->Flags & SMB2_FLAGS_SIGNED) ||
 464             server->tcpStatus == CifsNeedNegotiate)
 465                 return rc;
 466
 467         if (!server->session_estab) {
 468                 strncpy(shdr->Signature, "BSRSPYL", 8);
 469                 return rc;
 470         }
 471
 472         rc = server->ops->calc_signature(rqst, server);
 473
 474         return rc;
 475 }
 476
 477 int
 478 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 479 {
 480         unsigned int rc;
 481         char server_response_sig[16];
 482         struct smb2_sync_hdr *shdr =
 483                         (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
 484
 485         if ((shdr->Command == SMB2_NEGOTIATE) ||
 486             (shdr->Command == SMB2_SESSION_SETUP) ||
 487             (shdr->Command == SMB2_OPLOCK_BREAK) ||
 488             (!server->session_estab))
 489                 return 0;
 490
 491         /*
 492          * BB what if signatures are supposed to be on for session but
 493          * server does not send one? BB
 494          */
 495
 496         /* Do not need to verify session setups with signature "BSRSPYL " */
 497         if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
 498                 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
 499                          shdr->Command);
 500
 501         /*
 502          * Save off the origiginal signature so we can modify the smb and check
 503          * our calculated signature against what the server sent.
 504          */
 505         memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
 506
 507         memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
 508
 509         mutex_lock(&server->srv_mutex);
 510         rc = server->ops->calc_signature(rqst, server);
 511         mutex_unlock(&server->srv_mutex);
 512
 513         if (rc)
 514                 return rc;
 515
 516         if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE))
 517                 return -EACCES;
 518         else
 519                 return 0;
 520 }
 521
 522 /*
 523  * Set message id for the request. Should be called after wait_for_free_request
 524  * and when srv_mutex is held.
 525  */
 526 static inline void
 527 smb2_seq_num_into_buf(struct TCP_Server_Info *server,
 528                       struct smb2_sync_hdr *shdr)
 529 {
 530         unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
 531
 532         shdr->MessageId = get_next_mid64(server);
 533         /* skip message numbers according to CreditCharge field */
 534         for (i = 1; i < num; i++)
 535                 get_next_mid(server);
 536 }
 537
 538 static struct mid_q_entry *
 539 smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr,
 540                      struct TCP_Server_Info *server)
 541 {
 542         struct mid_q_entry *temp;
 543
 544         if (server == NULL) {
 545                 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
 546                 return NULL;
 547         }
 548
 549         temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
 550         memset(temp, 0, sizeof(struct mid_q_entry));
 551         kref_init(&temp->refcount);
 552         temp->mid = le64_to_cpu(shdr->MessageId);
 553         temp->pid = current->pid;
 554         temp->command = shdr->Command; /* Always LE */
 555         temp->when_alloc = jiffies;
 556         temp->server = server;
 557
 558         /*
 559          * The default is for the mid to be synchronous, so the
 560          * default callback just wakes up the current task.
 561          */
 562         temp->callback = cifs_wake_up_task;
 563         temp->callback_data = current;
 564
 565         atomic_inc(&midCount);
 566         temp->mid_state = MID_REQUEST_ALLOCATED;
 567         return temp;
 568 }
 569
 570 static int
 571 smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr,
 572                    struct mid_q_entry **mid)
 573 {
 574         if (ses->server->tcpStatus == CifsExiting)
 575                 return -ENOENT;
 576
 577         if (ses->server->tcpStatus == CifsNeedReconnect) {
 578                 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
 579                 return -EAGAIN;
 580         }
 581
 582         if (ses->status == CifsNew) {
 583                 if ((shdr->Command != SMB2_SESSION_SETUP) &&
 584                     (shdr->Command != SMB2_NEGOTIATE))
 585                         return -EAGAIN;
 586                 /* else ok - we are setting up session */
 587         }
 588
 589         if (ses->status == CifsExiting) {
 590                 if (shdr->Command != SMB2_LOGOFF)
 591                         return -EAGAIN;
 592                 /* else ok - we are shutting down the session */
 593         }
 594
 595         *mid = smb2_mid_entry_alloc(shdr, ses->server);
 596         if (*mid == NULL)
 597                 return -ENOMEM;
 598         spin_lock(&GlobalMid_Lock);
 599         list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
 600         spin_unlock(&GlobalMid_Lock);
 601         return 0;
 602 }
 603
 604 int
 605 smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
 606                    bool log_error)
 607 {
 608         unsigned int len = get_rfc1002_length(mid->resp_buf);
 609         struct kvec iov[2];
 610         struct smb_rqst rqst = { .rq_iov = iov,
 611                                  .rq_nvec = 2 };
 612
 613         iov[0].iov_base = (char *)mid->resp_buf;
 614         iov[0].iov_len = 4;
 615         iov[1].iov_base = (char *)mid->resp_buf + 4;
 616         iov[1].iov_len = len;
 617
 618         dump_smb(mid->resp_buf, min_t(u32, 80, len));
 619         /* convert the length into a more usable form */
 620         if (len > 24 && server->sign && !mid->decrypted) {
 621                 int rc;
 622
 623                 rc = smb2_verify_signature(&rqst, server);
 624                 if (rc)
 625                         cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
 626                                  rc);
 627         }
 628
 629         return map_smb2_to_linux_error(mid->resp_buf, log_error);
 630 }
 631
 632 struct mid_q_entry *
 633 smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
 634 {
 635         int rc;
 636         struct smb2_sync_hdr *shdr =
 637                         (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
 638         struct mid_q_entry *mid;
 639
 640         smb2_seq_num_into_buf(ses->server, shdr);
 641
 642         rc = smb2_get_mid_entry(ses, shdr, &mid);
 643         if (rc)
 644                 return ERR_PTR(rc);
 645         rc = smb2_sign_rqst(rqst, ses->server);
 646         if (rc) {
 647                 cifs_delete_mid(mid);
 648                 return ERR_PTR(rc);
 649         }
 650         return mid;
 651 }
 652
 653 struct mid_q_entry *
 654 smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
 655 {
 656         int rc;
 657         struct smb2_sync_hdr *shdr =
 658                         (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
 659         struct mid_q_entry *mid;
 660
 661         smb2_seq_num_into_buf(server, shdr);
 662
 663         mid = smb2_mid_entry_alloc(shdr, server);
 664         if (mid == NULL)
 665                 return ERR_PTR(-ENOMEM);
 666
 667         rc = smb2_sign_rqst(rqst, server);
 668         if (rc) {
 669                 DeleteMidQEntry(mid);
 670                 return ERR_PTR(rc);
 671         }
 672
 673         return mid;
 674 }
 675
 676 int
 677 smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
 678 {
 679         struct crypto_aead *tfm;
 680
 681         if (!server->secmech.ccmaesencrypt) {
 682                 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
 683                 if (IS_ERR(tfm)) {
 684                         cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n",
 685                                  __func__);
 686                         return PTR_ERR(tfm);
 687                 }
 688                 server->secmech.ccmaesencrypt = tfm;
 689         }
 690
 691         if (!server->secmech.ccmaesdecrypt) {
 692                 tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
 693                 if (IS_ERR(tfm)) {
 694                         crypto_free_aead(server->secmech.ccmaesencrypt);
 695                         server->secmech.ccmaesencrypt = NULL;
 696                         cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
 697                                  __func__);
 698                         return PTR_ERR(tfm);
 699                 }
 700                 server->secmech.ccmaesdecrypt = tfm;
 701         }
 702
 703         return 0;
 704 }