fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2011
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/xattr.h>
  36 #include "smb2pdu.h"
  37 #include "cifsglob.h"
  38 #include "cifsacl.h"
  39 #include "cifsproto.h"
  40 #include "smb2proto.h"
  41 #include "cifs_unicode.h"
  42 #include "cifs_debug.h"
  43 #include "ntlmssp.h"
  44 #include "smb2status.h"
  45
  46 /*
  47  *  The following table defines the expected "StructureSize" of SMB2 requests
  48  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  49  *
  50  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  51  *  indexed by command in host byte order.
  52  */
  53 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  54         /* SMB2_NEGOTIATE */ 36,
  55         /* SMB2_SESSION_SETUP */ 25,
  56         /* SMB2_LOGOFF */ 4,
  57         /* SMB2_TREE_CONNECT */ 9,
  58         /* SMB2_TREE_DISCONNECT */ 4,
  59         /* SMB2_CREATE */ 57,
  60         /* SMB2_CLOSE */ 24,
  61         /* SMB2_FLUSH */ 24,
  62         /* SMB2_READ */ 49,
  63         /* SMB2_WRITE */ 49,
  64         /* SMB2_LOCK */ 48,
  65         /* SMB2_IOCTL */ 57,
  66         /* SMB2_CANCEL */ 4,
  67         /* SMB2_ECHO */ 4,
  68         /* SMB2_QUERY_DIRECTORY */ 33,
  69         /* SMB2_CHANGE_NOTIFY */ 32,
  70         /* SMB2_QUERY_INFO */ 41,
  71         /* SMB2_SET_INFO */ 33,
  72         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  73 };
  74
  75
  76 static void
  77 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  78                   const struct cifs_tcon *tcon)
  79 {
  80         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  81         char *temp = (char *)hdr;
  82         /* lookup word count ie StructureSize from table */
  83         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  84
  85         /*
  86          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  87          * largest operations (Create)
  88          */
  89         memset(temp, 0, 256);
  90
  91         /* Note this is only network field converted to big endian */
  92         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  93                         - 4 /*  RFC 1001 length field itself not counted */);
  94
  95         hdr->ProtocolId[0] = 0xFE;
  96         hdr->ProtocolId[1] = 'S';
  97         hdr->ProtocolId[2] = 'M';
  98         hdr->ProtocolId[3] = 'B';
  99         hdr->StructureSize = cpu_to_le16(64);
 100         hdr->Command = smb2_cmd;
 101         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 102         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 103
 104         if (!tcon)
 105                 goto out;
 106
 107         hdr->TreeId = tcon->tid;
 108         /* Uid is not converted */
 109         if (tcon->ses)
 110                 hdr->SessionId = tcon->ses->Suid;
 111         /* BB check following DFS flags BB */
 112         /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
 113         if (tcon->share_flags & SHI1005_FLAGS_DFS)
 114                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
 115         /* BB how does SMB2 do case sensitive? */
 116         /* if (tcon->nocase)
 117                 hdr->Flags |= SMBFLG_CASELESS; */
 118         /* if (tcon->ses && tcon->ses->server &&
 119             (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED))
 120                 hdr->Flags |= SMB2_FLAGS_SIGNED; */
 121 out:
 122         pdu->StructureSize2 = cpu_to_le16(parmsize);
 123         return;
 124 }
 125
 126 static int
 127 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 128 {
 129         int rc = 0;
 130         struct nls_table *nls_codepage;
 131         struct cifs_ses *ses;
 132         struct TCP_Server_Info *server;
 133
 134         /*
 135          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 136          * check for tcp and smb session status done differently
 137          * for those three - in the calling routine.
 138          */
 139         if (tcon == NULL)
 140                 return rc;
 141
 142         if (smb2_command == SMB2_TREE_CONNECT)
 143                 return rc;
 144
 145         if (tcon->tidStatus == CifsExiting) {
 146                 /*
 147                  * only tree disconnect, open, and write,
 148                  * (and ulogoff which does not have tcon)
 149                  * are allowed as we start force umount.
 150                  */
 151                 if ((smb2_command != SMB2_WRITE) &&
 152                    (smb2_command != SMB2_CREATE) &&
 153                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 154                         cFYI(1, "can not send cmd %d while umounting",
 155                                 smb2_command);
 156                         return -ENODEV;
 157                 }
 158         }
 159         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 160             (!tcon->ses->server))
 161                 return -EIO;
 162
 163         ses = tcon->ses;
 164         server = ses->server;
 165
 166         /*
 167          * Give demultiplex thread up to 10 seconds to reconnect, should be
 168          * greater than cifs socket timeout which is 7 seconds
 169          */
 170         while (server->tcpStatus == CifsNeedReconnect) {
 171                 /*
 172                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 173                  * here since they are implicitly done when session drops.
 174                  */
 175                 switch (smb2_command) {
 176                 /*
 177                  * BB Should we keep oplock break and add flush to exceptions?
 178                  */
 179                 case SMB2_TREE_DISCONNECT:
 180                 case SMB2_CANCEL:
 181                 case SMB2_CLOSE:
 182                 case SMB2_OPLOCK_BREAK:
 183                         return -EAGAIN;
 184                 }
 185
 186                 wait_event_interruptible_timeout(server->response_q,
 187                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 188
 189                 /* are we still trying to reconnect? */
 190                 if (server->tcpStatus != CifsNeedReconnect)
 191                         break;
 192
 193                 /*
 194                  * on "soft" mounts we wait once. Hard mounts keep
 195                  * retrying until process is killed or server comes
 196                  * back on-line
 197                  */
 198                 if (!tcon->retry) {
 199                         cFYI(1, "gave up waiting on reconnect in smb_init");
 200                         return -EHOSTDOWN;
 201                 }
 202         }
 203
 204         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 205                 return rc;
 206
 207         nls_codepage = load_nls_default();
 208
 209         /*
 210          * need to prevent multiple threads trying to simultaneously reconnect
 211          * the same SMB session
 212          */
 213         mutex_lock(&tcon->ses->session_mutex);
 214         rc = cifs_negotiate_protocol(0, tcon->ses);
 215         if (!rc && tcon->ses->need_reconnect)
 216                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 217
 218         if (rc || !tcon->need_reconnect) {
 219                 mutex_unlock(&tcon->ses->session_mutex);
 220                 goto out;
 221         }
 222
 223         cifs_mark_open_files_invalid(tcon);
 224         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 225         mutex_unlock(&tcon->ses->session_mutex);
 226         cFYI(1, "reconnect tcon rc = %d", rc);
 227         if (rc)
 228                 goto out;
 229         atomic_inc(&tconInfoReconnectCount);
 230         /*
 231          * BB FIXME add code to check if wsize needs update due to negotiated
 232          * smb buffer size shrinking.
 233          */
 234 out:
 235         /*
 236          * Check if handle based operation so we know whether we can continue
 237          * or not without returning to caller to reset file handle.
 238          */
 239         /*
 240          * BB Is flush done by server on drop of tcp session? Should we special
 241          * case it and skip above?
 242          */
 243         switch (smb2_command) {
 244         case SMB2_FLUSH:
 245         case SMB2_READ:
 246         case SMB2_WRITE:
 247         case SMB2_LOCK:
 248         case SMB2_IOCTL:
 249         case SMB2_QUERY_DIRECTORY:
 250         case SMB2_CHANGE_NOTIFY:
 251         case SMB2_QUERY_INFO:
 252         case SMB2_SET_INFO:
 253                 return -EAGAIN;
 254         }
 255         unload_nls(nls_codepage);
 256         return rc;
 257 }
 258
 259 /*
 260  * Allocate and return pointer to an SMB request hdr, and set basic
 261  * SMB information in the SMB header. If the return code is zero, this
 262  * function must have filled in request_buf pointer.
 263  */
 264 static int
 265 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 266                 void **request_buf)
 267 {
 268         int rc = 0;
 269
 270         rc = smb2_reconnect(smb2_command, tcon);
 271         if (rc)
 272                 return rc;
 273
 274         /* BB eventually switch this to SMB2 specific small buf size */
 275         *request_buf = cifs_small_buf_get();
 276         if (*request_buf == NULL) {
 277                 /* BB should we add a retry in here if not a writepage? */
 278                 return -ENOMEM;
 279         }
 280
 281         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 282
 283         if (tcon != NULL) {
 284 #ifdef CONFIG_CIFS_STATS2
 285                 uint16_t com_code = le16_to_cpu(smb2_command);
 286                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 287 #endif
 288                 cifs_stats_inc(&tcon->num_smbs_sent);
 289         }
 290
 291         return rc;
 292 }
 293
 294 static void
 295 free_rsp_buf(int resp_buftype, void *rsp)
 296 {
 297         if (resp_buftype == CIFS_SMALL_BUFFER)
 298                 cifs_small_buf_release(rsp);
 299         else if (resp_buftype == CIFS_LARGE_BUFFER)
 300                 cifs_buf_release(rsp);
 301 }
 302
 303 #define SMB2_NUM_PROT 1
 304
 305 #define SMB2_PROT   0
 306 #define SMB21_PROT  1
 307 #define BAD_PROT 0xFFFF
 308
 309 #define SMB2_PROT_ID  0x0202
 310 #define SMB21_PROT_ID 0x0210
 311 #define BAD_PROT_ID   0xFFFF
 312
 313 static struct {
 314         int index;
 315         __le16 name;
 316 } smb2protocols[] = {
 317         {SMB2_PROT,  cpu_to_le16(SMB2_PROT_ID)},
 318         {SMB21_PROT, cpu_to_le16(SMB21_PROT_ID)},
 319         {BAD_PROT,   cpu_to_le16(BAD_PROT_ID)}
 320 };
 321
 322 /*
 323  *
 324  *      SMB2 Worker functions follow:
 325  *
 326  *      The general structure of the worker functions is:
 327  *      1) Call smb2_init (assembles SMB2 header)
 328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 330  *      4) Decode SMB2 command specific fields in the fixed length area
 331  *      5) Decode variable length data area (if any for this SMB2 command type)
 332  *      6) Call free smb buffer
 333  *      7) return
 334  *
 335  */
 336
 337 int
 338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 339 {
 340         struct smb2_negotiate_req *req;
 341         struct smb2_negotiate_rsp *rsp;
 342         struct kvec iov[1];
 343         int rc = 0;
 344         int resp_buftype;
 345         struct TCP_Server_Info *server;
 346         unsigned int sec_flags;
 347         u16 i;
 348         u16 temp = 0;
 349         int blob_offset, blob_length;
 350         char *security_blob;
 351         int flags = CIFS_NEG_OP;
 352
 353         cFYI(1, "Negotiate protocol");
 354
 355         if (ses->server)
 356                 server = ses->server;
 357         else {
 358                 rc = -EIO;
 359                 return rc;
 360         }
 361
 362         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 363         if (rc)
 364                 return rc;
 365
 366         /* if any of auth flags (ie not sign or seal) are overriden use them */
 367         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 368                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 369         else /* if override flags set only sign/seal OR them with global auth */
 370                 sec_flags = global_secflags | ses->overrideSecFlg;
 371
 372         cFYI(1, "sec_flags 0x%x", sec_flags);
 373
 374         req->hdr.SessionId = 0;
 375
 376         for (i = 0; i < SMB2_NUM_PROT; i++)
 377                 req->Dialects[i] = smb2protocols[i].name;
 378
 379         req->DialectCount = cpu_to_le16(i);
 380         inc_rfc1001_len(req, i * 2);
 381
 382         /* only one of SMB2 signing flags may be set in SMB2 request */
 383         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 384                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 385         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 386                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 387
 388         req->SecurityMode = cpu_to_le16(temp);
 389
 390         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
 391
 392         iov[0].iov_base = (char *)req;
 393         /* 4 for rfc1002 length field */
 394         iov[0].iov_len = get_rfc1002_length(req) + 4;
 395
 396         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 397
 398         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 399         /*
 400          * No tcon so can't do
 401          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 402          */
 403         if (rc != 0)
 404                 goto neg_exit;
 405
 406         if (rsp == NULL) {
 407                 rc = -EIO;
 408                 goto neg_exit;
 409         }
 410
 411         cFYI(1, "mode 0x%x", rsp->SecurityMode);
 412
 413         if (rsp->DialectRevision == smb2protocols[SMB21_PROT].name)
 414                 cFYI(1, "negotiated smb2.1 dialect");
 415         else if (rsp->DialectRevision == smb2protocols[SMB2_PROT].name)
 416                 cFYI(1, "negotiated smb2 dialect");
 417         else {
 418                 cERROR(1, "Illegal dialect returned by server %d",
 419                            le16_to_cpu(rsp->DialectRevision));
 420                 rc = -EIO;
 421                 goto neg_exit;
 422         }
 423         server->dialect = le16_to_cpu(rsp->DialectRevision);
 424
 425         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 426         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 427         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 428         /* BB Do we need to validate the SecurityMode? */
 429         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 430         server->capabilities = le32_to_cpu(rsp->Capabilities);
 431         /* Internal types */
 432         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 433
 434         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 435                                                &rsp->hdr);
 436         if (blob_length == 0) {
 437                 cERROR(1, "missing security blob on negprot");
 438                 rc = -EIO;
 439                 goto neg_exit;
 440         }
 441 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 442         rc = decode_neg_token_init(security_blob, blob_length,
 443                                    &server->sec_type);
 444         if (rc == 1)
 445                 rc = 0;
 446         else if (rc == 0) {
 447                 rc = -EIO;
 448                 goto neg_exit;
 449         }
 450 #endif
 451
 452 neg_exit:
 453         free_rsp_buf(resp_buftype, rsp);
 454         return rc;
 455 }
 456
 457 int
 458 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 459                 const struct nls_table *nls_cp)
 460 {
 461         struct smb2_sess_setup_req *req;
 462         struct smb2_sess_setup_rsp *rsp = NULL;
 463         struct kvec iov[2];
 464         int rc = 0;
 465         int resp_buftype;
 466         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 467         struct TCP_Server_Info *server;
 468         unsigned int sec_flags;
 469         u8 temp = 0;
 470         u16 blob_length = 0;
 471         char *security_blob;
 472         char *ntlmssp_blob = NULL;
 473         bool use_spnego = false; /* else use raw ntlmssp */
 474
 475         cFYI(1, "Session Setup");
 476
 477         if (ses->server)
 478                 server = ses->server;
 479         else {
 480                 rc = -EIO;
 481                 return rc;
 482         }
 483
 484         /*
 485          * If memory allocation is successful, caller of this function
 486          * frees it.
 487          */
 488         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 489         if (!ses->ntlmssp)
 490                 return -ENOMEM;
 491
 492         ses->server->secType = RawNTLMSSP;
 493
 494 ssetup_ntlmssp_authenticate:
 495         if (phase == NtLmChallenge)
 496                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 497
 498         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 499         if (rc)
 500                 return rc;
 501
 502         /* if any of auth flags (ie not sign or seal) are overriden use them */
 503         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 504                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 505         else /* if override flags set only sign/seal OR them with global auth */
 506                 sec_flags = global_secflags | ses->overrideSecFlg;
 507
 508         cFYI(1, "sec_flags 0x%x", sec_flags);
 509
 510         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 511         req->VcNumber = 0; /* MBZ */
 512         /* to enable echos and oplocks */
 513         req->hdr.CreditRequest = cpu_to_le16(3);
 514
 515         /* only one of SMB2 signing flags may be set in SMB2 request */
 516         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 517                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 518         else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
 519                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 520         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 521                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 522
 523         req->SecurityMode = temp;
 524         req->Capabilities = 0;
 525         req->Channel = 0; /* MBZ */
 526
 527         iov[0].iov_base = (char *)req;
 528         /* 4 for rfc1002 length field and 1 for pad */
 529         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 530         if (phase == NtLmNegotiate) {
 531                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 532                                        GFP_KERNEL);
 533                 if (ntlmssp_blob == NULL) {
 534                         rc = -ENOMEM;
 535                         goto ssetup_exit;
 536                 }
 537                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 538                 if (use_spnego) {
 539                         /* blob_length = build_spnego_ntlmssp_blob(
 540                                         &security_blob,
 541                                         sizeof(struct _NEGOTIATE_MESSAGE),
 542                                         ntlmssp_blob); */
 543                         /* BB eventually need to add this */
 544                         cERROR(1, "spnego not supported for SMB2 yet");
 545                         rc = -EOPNOTSUPP;
 546                         kfree(ntlmssp_blob);
 547                         goto ssetup_exit;
 548                 } else {
 549                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 550                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 551                         security_blob = ntlmssp_blob;
 552                 }
 553         } else if (phase == NtLmAuthenticate) {
 554                 req->hdr.SessionId = ses->Suid;
 555                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 556                                        GFP_KERNEL);
 557                 if (ntlmssp_blob == NULL) {
 558                         cERROR(1, "failed to malloc ntlmssp blob");
 559                         rc = -ENOMEM;
 560                         goto ssetup_exit;
 561                 }
 562                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 563                                              nls_cp);
 564                 if (rc) {
 565                         cFYI(1, "build_ntlmssp_auth_blob failed %d", rc);
 566                         goto ssetup_exit; /* BB double check error handling */
 567                 }
 568                 if (use_spnego) {
 569                         /* blob_length = build_spnego_ntlmssp_blob(
 570                                                         &security_blob,
 571                                                         blob_length,
 572                                                         ntlmssp_blob); */
 573                         cERROR(1, "spnego not supported for SMB2 yet");
 574                         rc = -EOPNOTSUPP;
 575                         kfree(ntlmssp_blob);
 576                         goto ssetup_exit;
 577                 } else {
 578                         security_blob = ntlmssp_blob;
 579                 }
 580         } else {
 581                 cERROR(1, "illegal ntlmssp phase");
 582                 rc = -EIO;
 583                 goto ssetup_exit;
 584         }
 585
 586         /* Testing shows that buffer offset must be at location of Buffer[0] */
 587         req->SecurityBufferOffset =
 588                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 589                                             1 /* pad */ - 4 /* rfc1001 len */);
 590         req->SecurityBufferLength = cpu_to_le16(blob_length);
 591         iov[1].iov_base = security_blob;
 592         iov[1].iov_len = blob_length;
 593
 594         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 595
 596         /* BB add code to build os and lm fields */
 597
 598         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, CIFS_LOG_ERROR);
 599
 600         kfree(security_blob);
 601         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 602         if (rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 603                 if (phase != NtLmNegotiate) {
 604                         cERROR(1, "Unexpected more processing error");
 605                         goto ssetup_exit;
 606                 }
 607                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 608                         le16_to_cpu(rsp->SecurityBufferOffset)) {
 609                         cERROR(1, "Invalid security buffer offset %d",
 610                                   le16_to_cpu(rsp->SecurityBufferOffset));
 611                         rc = -EIO;
 612                         goto ssetup_exit;
 613                 }
 614
 615                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 616                 phase = NtLmChallenge; /* process ntlmssp challenge */
 617                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 618                 ses->Suid = rsp->hdr.SessionId;
 619                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 620                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 621         }
 622
 623         /*
 624          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 625          * but at least the raw NTLMSSP case works.
 626          */
 627         /*
 628          * No tcon so can't do
 629          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 630          */
 631         if (rc != 0)
 632                 goto ssetup_exit;
 633
 634         if (rsp == NULL) {
 635                 rc = -EIO;
 636                 goto ssetup_exit;
 637         }
 638
 639         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 640 ssetup_exit:
 641         free_rsp_buf(resp_buftype, rsp);
 642
 643         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 644         if ((phase == NtLmChallenge) && (rc == 0))
 645                 goto ssetup_ntlmssp_authenticate;
 646         return rc;
 647 }
 648
 649 int
 650 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 651 {
 652         struct smb2_logoff_req *req; /* response is also trivial struct */
 653         int rc = 0;
 654         struct TCP_Server_Info *server;
 655
 656         cFYI(1, "disconnect session %p", ses);
 657
 658         if (ses && (ses->server))
 659                 server = ses->server;
 660         else
 661                 return -EIO;
 662
 663         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 664         if (rc)
 665                 return rc;
 666
 667          /* since no tcon, smb2_init can not do this, so do here */
 668         req->hdr.SessionId = ses->Suid;
 669
 670         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 671         /*
 672          * No tcon so can't do
 673          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 674          */
 675         return rc;
 676 }
 677
 678 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 679 {
 680         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 681 }
 682
 683 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 684
 685 int
 686 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 687           struct cifs_tcon *tcon, const struct nls_table *cp)
 688 {
 689         struct smb2_tree_connect_req *req;
 690         struct smb2_tree_connect_rsp *rsp = NULL;
 691         struct kvec iov[2];
 692         int rc = 0;
 693         int resp_buftype;
 694         int unc_path_len;
 695         struct TCP_Server_Info *server;
 696         __le16 *unc_path = NULL;
 697
 698         cFYI(1, "TCON");
 699
 700         if ((ses->server) && tree)
 701                 server = ses->server;
 702         else
 703                 return -EIO;
 704
 705         if (tcon && tcon->bad_network_name)
 706                 return -ENOENT;
 707
 708         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 709         if (unc_path == NULL)
 710                 return -ENOMEM;
 711
 712         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 713         unc_path_len *= 2;
 714         if (unc_path_len < 2) {
 715                 kfree(unc_path);
 716                 return -EINVAL;
 717         }
 718
 719         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 720         if (rc) {
 721                 kfree(unc_path);
 722                 return rc;
 723         }
 724
 725         if (tcon == NULL) {
 726                 /* since no tcon, smb2_init can not do this, so do here */
 727                 req->hdr.SessionId = ses->Suid;
 728                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 729                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 730         }
 731
 732         iov[0].iov_base = (char *)req;
 733         /* 4 for rfc1002 length field and 1 for pad */
 734         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 735
 736         /* Testing shows that buffer offset must be at location of Buffer[0] */
 737         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 738                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 739         req->PathLength = cpu_to_le16(unc_path_len - 2);
 740         iov[1].iov_base = unc_path;
 741         iov[1].iov_len = unc_path_len;
 742
 743         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 744
 745         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 746         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 747
 748         if (rc != 0) {
 749                 if (tcon) {
 750                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 751                         tcon->need_reconnect = true;
 752                 }
 753                 goto tcon_error_exit;
 754         }
 755
 756         if (rsp == NULL) {
 757                 rc = -EIO;
 758                 goto tcon_exit;
 759         }
 760
 761         if (tcon == NULL) {
 762                 ses->ipc_tid = rsp->hdr.TreeId;
 763                 goto tcon_exit;
 764         }
 765
 766         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 767                 cFYI(1, "connection to disk share");
 768         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 769                 tcon->ipc = true;
 770                 cFYI(1, "connection to pipe share");
 771         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 772                 tcon->print = true;
 773                 cFYI(1, "connection to printer");
 774         } else {
 775                 cERROR(1, "unknown share type %d", rsp->ShareType);
 776                 rc = -EOPNOTSUPP;
 777                 goto tcon_error_exit;
 778         }
 779
 780         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 781         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 782         tcon->tidStatus = CifsGood;
 783         tcon->need_reconnect = false;
 784         tcon->tid = rsp->hdr.TreeId;
 785         strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
 786
 787         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 788             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 789                 cERROR(1, "DFS capability contradicts DFS flag");
 790
 791 tcon_exit:
 792         free_rsp_buf(resp_buftype, rsp);
 793         kfree(unc_path);
 794         return rc;
 795
 796 tcon_error_exit:
 797         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 798                 cERROR(1, "BAD_NETWORK_NAME: %s", tree);
 799                 tcon->bad_network_name = true;
 800         }
 801         goto tcon_exit;
 802 }
 803
 804 int
 805 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 806 {
 807         struct smb2_tree_disconnect_req *req; /* response is trivial */
 808         int rc = 0;
 809         struct TCP_Server_Info *server;
 810         struct cifs_ses *ses = tcon->ses;
 811
 812         cFYI(1, "Tree Disconnect");
 813
 814         if (ses && (ses->server))
 815                 server = ses->server;
 816         else
 817                 return -EIO;
 818
 819         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 820                 return 0;
 821
 822         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 823         if (rc)
 824                 return rc;
 825
 826         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 827         if (rc)
 828                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 829
 830         return rc;
 831 }
 832
 833 int
 834 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 835           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 836           __u32 create_disposition, __u32 file_attributes, __u32 create_options)
 837 {
 838         struct smb2_create_req *req;
 839         struct smb2_create_rsp *rsp;
 840         struct TCP_Server_Info *server;
 841         struct cifs_ses *ses = tcon->ses;
 842         struct kvec iov[2];
 843         int resp_buftype;
 844         int uni_path_len;
 845         int rc = 0;
 846         int num_iovecs = 2;
 847
 848         cFYI(1, "create/open");
 849
 850         if (ses && (ses->server))
 851                 server = ses->server;
 852         else
 853                 return -EIO;
 854
 855         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 856         if (rc)
 857                 return rc;
 858
 859         if (enable_oplocks)
 860                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_BATCH;
 861         else
 862                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
 863         req->ImpersonationLevel = IL_IMPERSONATION;
 864         req->DesiredAccess = cpu_to_le32(desired_access);
 865         /* File attributes ignored on open (used in create though) */
 866         req->FileAttributes = cpu_to_le32(file_attributes);
 867         req->ShareAccess = FILE_SHARE_ALL_LE;
 868         req->CreateDisposition = cpu_to_le32(create_disposition);
 869         req->CreateOptions = cpu_to_le32(create_options);
 870         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 871         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 872                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 873
 874         iov[0].iov_base = (char *)req;
 875         /* 4 for rfc1002 length field */
 876         iov[0].iov_len = get_rfc1002_length(req) + 4;
 877
 878         /* MUST set path len (NameLength) to 0 opening root of share */
 879         if (uni_path_len >= 4) {
 880                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 881                 /* -1 since last byte is buf[0] which is sent below (path) */
 882                 iov[0].iov_len--;
 883                 iov[1].iov_len = uni_path_len;
 884                 iov[1].iov_base = path;
 885                 /*
 886                  * -1 since last byte is buf[0] which was counted in
 887                  * smb2_buf_len.
 888                  */
 889                 inc_rfc1001_len(req, uni_path_len - 1);
 890         } else {
 891                 num_iovecs = 1;
 892                 req->NameLength = 0;
 893         }
 894
 895         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
 896         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
 897
 898         if (rc != 0) {
 899                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
 900                 goto creat_exit;
 901         }
 902
 903         if (rsp == NULL) {
 904                 rc = -EIO;
 905                 goto creat_exit;
 906         }
 907         *persistent_fid = rsp->PersistentFileId;
 908         *volatile_fid = rsp->VolatileFileId;
 909 creat_exit:
 910         free_rsp_buf(resp_buftype, rsp);
 911         return rc;
 912 }
 913
 914 int
 915 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
 916            u64 persistent_fid, u64 volatile_fid)
 917 {
 918         struct smb2_close_req *req;
 919         struct smb2_close_rsp *rsp;
 920         struct TCP_Server_Info *server;
 921         struct cifs_ses *ses = tcon->ses;
 922         struct kvec iov[1];
 923         int resp_buftype;
 924         int rc = 0;
 925
 926         cFYI(1, "Close");
 927
 928         if (ses && (ses->server))
 929                 server = ses->server;
 930         else
 931                 return -EIO;
 932
 933         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
 934         if (rc)
 935                 return rc;
 936
 937         req->PersistentFileId = persistent_fid;
 938         req->VolatileFileId = volatile_fid;
 939
 940         iov[0].iov_base = (char *)req;
 941         /* 4 for rfc1002 length field */
 942         iov[0].iov_len = get_rfc1002_length(req) + 4;
 943
 944         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
 945         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
 946
 947         if (rc != 0) {
 948                 if (tcon)
 949                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
 950                 goto close_exit;
 951         }
 952
 953         if (rsp == NULL) {
 954                 rc = -EIO;
 955                 goto close_exit;
 956         }
 957
 958         /* BB FIXME - decode close response, update inode for caching */
 959
 960 close_exit:
 961         free_rsp_buf(resp_buftype, rsp);
 962         return rc;
 963 }
 964
 965 static int
 966 validate_buf(unsigned int offset, unsigned int buffer_length,
 967              struct smb2_hdr *hdr, unsigned int min_buf_size)
 968
 969 {
 970         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
 971         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
 972         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
 973         char *end_of_buf = begin_of_buf + buffer_length;
 974
 975
 976         if (buffer_length < min_buf_size) {
 977                 cERROR(1, "buffer length %d smaller than minimum size %d",
 978                            buffer_length, min_buf_size);
 979                 return -EINVAL;
 980         }
 981
 982         /* check if beyond RFC1001 maximum length */
 983         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
 984                 cERROR(1, "buffer length %d or smb length %d too large",
 985                            buffer_length, smb_len);
 986                 return -EINVAL;
 987         }
 988
 989         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
 990                 cERROR(1, "illegal server response, bad offset to data");
 991                 return -EINVAL;
 992         }
 993
 994         return 0;
 995 }
 996
 997 /*
 998  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
 999  * Caller must free buffer.
1000  */
1001 static int
1002 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1003                       struct smb2_hdr *hdr, unsigned int minbufsize,
1004                       char *data)
1005
1006 {
1007         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1008         int rc;
1009
1010         if (!data)
1011                 return -EINVAL;
1012
1013         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1014         if (rc)
1015                 return rc;
1016
1017         memcpy(data, begin_of_buf, buffer_length);
1018
1019         return 0;
1020 }
1021
1022 int
1023 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1024                 u64 persistent_fid, u64 volatile_fid,
1025                 struct smb2_file_all_info *data)
1026 {
1027         struct smb2_query_info_req *req;
1028         struct smb2_query_info_rsp *rsp = NULL;
1029         struct kvec iov[2];
1030         int rc = 0;
1031         int resp_buftype;
1032         struct TCP_Server_Info *server;
1033         struct cifs_ses *ses = tcon->ses;
1034
1035         cFYI(1, "Query Info");
1036
1037         if (ses && (ses->server))
1038                 server = ses->server;
1039         else
1040                 return -EIO;
1041
1042         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1043         if (rc)
1044                 return rc;
1045
1046         req->InfoType = SMB2_O_INFO_FILE;
1047         req->FileInfoClass = FILE_ALL_INFORMATION;
1048         req->PersistentFileId = persistent_fid;
1049         req->VolatileFileId = volatile_fid;
1050         /* 4 for rfc1002 length field and 1 for Buffer */
1051         req->InputBufferOffset =
1052                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1053         req->OutputBufferLength =
1054                 cpu_to_le32(sizeof(struct smb2_file_all_info) + MAX_NAME * 2);
1055
1056         iov[0].iov_base = (char *)req;
1057         /* 4 for rfc1002 length field */
1058         iov[0].iov_len = get_rfc1002_length(req) + 4;
1059
1060         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1061         if (rc) {
1062                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1063                 goto qinf_exit;
1064         }
1065
1066         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1067
1068         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1069                                    le32_to_cpu(rsp->OutputBufferLength),
1070                                    &rsp->hdr, sizeof(struct smb2_file_all_info),
1071                                    (char *)data);
1072
1073 qinf_exit:
1074         free_rsp_buf(resp_buftype, rsp);
1075         return rc;
1076 }
1077
1078 /*
1079  * This is a no-op for now. We're not really interested in the reply, but
1080  * rather in the fact that the server sent one and that server->lstrp
1081  * gets updated.
1082  *
1083  * FIXME: maybe we should consider checking that the reply matches request?
1084  */
1085 static void
1086 smb2_echo_callback(struct mid_q_entry *mid)
1087 {
1088         struct TCP_Server_Info *server = mid->callback_data;
1089         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1090         unsigned int credits_received = 1;
1091
1092         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1093                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1094
1095         DeleteMidQEntry(mid);
1096         add_credits(server, credits_received, CIFS_ECHO_OP);
1097 }
1098
1099 int
1100 SMB2_echo(struct TCP_Server_Info *server)
1101 {
1102         struct smb2_echo_req *req;
1103         int rc = 0;
1104         struct kvec iov;
1105
1106         cFYI(1, "In echo request");
1107
1108         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1109         if (rc)
1110                 return rc;
1111
1112         req->hdr.CreditRequest = cpu_to_le16(1);
1113
1114         iov.iov_base = (char *)req;
1115         /* 4 for rfc1002 length field */
1116         iov.iov_len = get_rfc1002_length(req) + 4;
1117
1118         rc = cifs_call_async(server, &iov, 1, NULL, smb2_echo_callback, server,
1119                              CIFS_ECHO_OP);
1120         if (rc)
1121                 cFYI(1, "Echo request failed: %d", rc);
1122
1123         cifs_small_buf_release(req);
1124         return rc;
1125 }