source/rpc_parse/parse_prs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba memory buffer functions
   4    Copyright (C) Andrew Tridgell              1992-1997
   5    Copyright (C) Luke Kenneth Casson Leighton 1996-1997
   6    Copyright (C) Jeremy Allison               1999
   7    Copyright (C) Andrew Bartlett              2003.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_RPC_PARSE
  28
  29 /**
  30  * Dump a prs to a file: from the current location through to the end.
  31  **/
  32 void prs_dump(char *name, int v, prs_struct *ps)
  33 {
  34         prs_dump_region(name, v, ps, ps->data_offset, ps->buffer_size);
  35 }
  36
  37 /**
  38  * Dump from the start of the prs to the current location.
  39  **/
  40 void prs_dump_before(char *name, int v, prs_struct *ps)
  41 {
  42         prs_dump_region(name, v, ps, 0, ps->data_offset);
  43 }
  44
  45 /**
  46  * Dump everything from the start of the prs up to the current location.
  47  **/
  48 void prs_dump_region(char *name, int v, prs_struct *ps,
  49                      int from_off, int to_off)
  50 {
  51         int fd, i;
  52         pstring fname;
  53         ssize_t sz;
  54         if (DEBUGLEVEL < 50) return;
  55         for (i=1;i<100;i++) {
  56                 if (v != -1) {
  57                         slprintf(fname,sizeof(fname)-1, "/tmp/%s_%d.%d.prs", name, v, i);
  58                 } else {
  59                         slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.prs", name, i);
  60                 }
  61                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
  62                 if (fd != -1 || errno != EEXIST) break;
  63         }
  64         if (fd != -1) {
  65                 sz = write(fd, ps->data_p + from_off, to_off - from_off);
  66                 i = close(fd);
  67                 if ( (sz != to_off-from_off) || (i != 0) ) {
  68                         DEBUG(0,("Error writing/closing %s: %ld!=%ld %d\n", fname, (unsigned long)sz, (unsigned long)to_off-from_off, i ));
  69                 } else {
  70                         DEBUG(0,("created %s\n", fname));
  71                 }
  72         }
  73 }
  74
  75 /*******************************************************************
  76  Debug output for parsing info
  77
  78  XXXX side-effect of this function is to increase the debug depth XXXX.
  79
  80 ********************************************************************/
  81
  82 void prs_debug(prs_struct *ps, int depth, const char *desc, const char *fn_name)
  83 {
  84         DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(depth), ps->data_offset, fn_name, desc));
  85 }
  86
  87 /**
  88  * Initialise an expandable parse structure.
  89  *
  90  * @param size Initial buffer size.  If >0, a new buffer will be
  91  * created with malloc().
  92  *
  93  * @return False if allocation fails, otherwise True.
  94  **/
  95
  96 BOOL prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, BOOL io)
  97 {
  98         ZERO_STRUCTP(ps);
  99         ps->io = io;
 100         ps->bigendian_data = RPC_LITTLE_ENDIAN;
 101         ps->align = RPC_PARSE_ALIGN;
 102         ps->is_dynamic = False;
 103         ps->data_offset = 0;
 104         ps->buffer_size = 0;
 105         ps->data_p = NULL;
 106         ps->mem_ctx = ctx;
 107
 108         if (size != 0) {
 109                 ps->buffer_size = size;
 110                 if((ps->data_p = (char *)SMB_MALLOC((size_t)size)) == NULL) {
 111                         DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
 112                         return False;
 113                 }
 114                 memset(ps->data_p, '\0', (size_t)size);
 115                 ps->is_dynamic = True; /* We own this memory. */
 116         } else if (MARSHALLING(ps)) {
 117                 /* If size is zero and we're marshalling we should allocate memory on demand. */
 118                 ps->is_dynamic = True;
 119         }
 120
 121         return True;
 122 }
 123
 124 /*******************************************************************
 125  Delete the memory in a parse structure - if we own it.
 126  ********************************************************************/
 127
 128 void prs_mem_free(prs_struct *ps)
 129 {
 130         if(ps->is_dynamic)
 131                 SAFE_FREE(ps->data_p);
 132         ps->is_dynamic = False;
 133         ps->buffer_size = 0;
 134         ps->data_offset = 0;
 135 }
 136
 137 /*******************************************************************
 138  Clear the memory in a parse structure.
 139  ********************************************************************/
 140
 141 void prs_mem_clear(prs_struct *ps)
 142 {
 143         if (ps->buffer_size)
 144                 memset(ps->data_p, '\0', (size_t)ps->buffer_size);
 145 }
 146
 147 /*******************************************************************
 148  Allocate memory when unmarshalling... Always zero clears.
 149  ********************************************************************/
 150
 151 #if defined(PARANOID_MALLOC_CHECKER)
 152 char *prs_alloc_mem_(prs_struct *ps, size_t size, unsigned int count)
 153 #else
 154 char *prs_alloc_mem(prs_struct *ps, size_t size, unsigned int count)
 155 #endif
 156 {
 157         char *ret = NULL;
 158
 159         if (size) {
 160                 /* We can't call the type-safe version here. */
 161                 ret = _talloc_zero_array(ps->mem_ctx, size, count, "parse_prs");
 162         }
 163         return ret;
 164 }
 165
 166 /*******************************************************************
 167  Return the current talloc context we're using.
 168  ********************************************************************/
 169
 170 TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
 171 {
 172         return ps->mem_ctx;
 173 }
 174
 175 /*******************************************************************
 176  Hand some already allocated memory to a prs_struct.
 177  ********************************************************************/
 178
 179 void prs_give_memory(prs_struct *ps, char *buf, uint32 size, BOOL is_dynamic)
 180 {
 181         ps->is_dynamic = is_dynamic;
 182         ps->data_p = buf;
 183         ps->buffer_size = size;
 184 }
 185
 186 /*******************************************************************
 187  Take some memory back from a prs_struct.
 188  ********************************************************************/
 189
 190 char *prs_take_memory(prs_struct *ps, uint32 *psize)
 191 {
 192         char *ret = ps->data_p;
 193         if(psize)
 194                 *psize = ps->buffer_size;
 195         ps->is_dynamic = False;
 196         prs_mem_free(ps);
 197         return ret;
 198 }
 199
 200 /*******************************************************************
 201  Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
 202  ********************************************************************/
 203
 204 BOOL prs_set_buffer_size(prs_struct *ps, uint32 newsize)
 205 {
 206         if (newsize > ps->buffer_size)
 207                 return prs_force_grow(ps, newsize - ps->buffer_size);
 208
 209         if (newsize < ps->buffer_size) {
 210                 char *new_data_p = SMB_REALLOC(ps->data_p, newsize);
 211                 /* if newsize is zero, Realloc acts like free() & returns NULL*/
 212                 if (new_data_p == NULL && newsize != 0) {
 213                         DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
 214                                 (unsigned int)newsize));
 215                         DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
 216                         return False;
 217                 }
 218                 ps->data_p = new_data_p;
 219                 ps->buffer_size = newsize;
 220         }
 221
 222         return True;
 223 }
 224
 225 /*******************************************************************
 226  Attempt, if needed, to grow a data buffer.
 227  Also depends on the data stream mode (io).
 228  ********************************************************************/
 229
 230 BOOL prs_grow(prs_struct *ps, uint32 extra_space)
 231 {
 232         uint32 new_size;
 233         char *new_data;
 234
 235         ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
 236
 237         if(ps->data_offset + extra_space <= ps->buffer_size)
 238                 return True;
 239
 240         /*
 241          * We cannot grow the buffer if we're not reading
 242          * into the prs_struct, or if we don't own the memory.
 243          */
 244
 245         if(UNMARSHALLING(ps) || !ps->is_dynamic) {
 246                 DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 247                                 (unsigned int)extra_space));
 248                 return False;
 249         }
 250
 251         /*
 252          * Decide how much extra space we really need.
 253          */
 254
 255         extra_space -= (ps->buffer_size - ps->data_offset);
 256         if(ps->buffer_size == 0) {
 257                 /*
 258                  * Ensure we have at least a PDU's length, or extra_space, whichever
 259                  * is greater.
 260                  */
 261
 262                 new_size = MAX(RPC_MAX_PDU_FRAG_LEN,extra_space);
 263
 264                 if((new_data = SMB_MALLOC(new_size)) == NULL) {
 265                         DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
 266                         return False;
 267                 }
 268                 memset(new_data, '\0', (size_t)new_size );
 269         } else {
 270                 /*
 271                  * If the current buffer size is bigger than the space needed, just
 272                  * double it, else add extra_space.
 273                  */
 274                 new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);
 275
 276                 if ((new_data = SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 277                         DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
 278                                 (unsigned int)new_size));
 279                         return False;
 280                 }
 281
 282                 memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 283         }
 284         ps->buffer_size = new_size;
 285         ps->data_p = new_data;
 286
 287         return True;
 288 }
 289
 290 /*******************************************************************
 291  Attempt to force a data buffer to grow by len bytes.
 292  This is only used when appending more data onto a prs_struct
 293  when reading an rpc reply, before unmarshalling it.
 294  ********************************************************************/
 295
 296 BOOL prs_force_grow(prs_struct *ps, uint32 extra_space)
 297 {
 298         uint32 new_size = ps->buffer_size + extra_space;
 299         char *new_data;
 300
 301         if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
 302                 DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 303                                 (unsigned int)extra_space));
 304                 return False;
 305         }
 306
 307         if((new_data = SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 308                 DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
 309                         (unsigned int)new_size));
 310                 return False;
 311         }
 312
 313         memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 314
 315         ps->buffer_size = new_size;
 316         ps->data_p = new_data;
 317
 318         return True;
 319 }
 320
 321 /*******************************************************************
 322  Get the data pointer (external interface).
 323 ********************************************************************/
 324
 325 char *prs_data_p(prs_struct *ps)
 326 {
 327         return ps->data_p;
 328 }
 329
 330 /*******************************************************************
 331  Get the current data size (external interface).
 332  ********************************************************************/
 333
 334 uint32 prs_data_size(prs_struct *ps)
 335 {
 336         return ps->buffer_size;
 337 }
 338
 339 /*******************************************************************
 340  Fetch the current offset (external interface).
 341  ********************************************************************/
 342
 343 uint32 prs_offset(prs_struct *ps)
 344 {
 345         return ps->data_offset;
 346 }
 347
 348 /*******************************************************************
 349  Set the current offset (external interface).
 350  ********************************************************************/
 351
 352 BOOL prs_set_offset(prs_struct *ps, uint32 offset)
 353 {
 354         if(offset <= ps->data_offset) {
 355                 ps->data_offset = offset;
 356                 return True;
 357         }
 358
 359         if(!prs_grow(ps, offset - ps->data_offset))
 360                 return False;
 361
 362         ps->data_offset = offset;
 363         return True;
 364 }
 365
 366 /*******************************************************************
 367  Append the data from one parse_struct into another.
 368  ********************************************************************/
 369
 370 BOOL prs_append_prs_data(prs_struct *dst, prs_struct *src)
 371 {
 372         if (prs_offset(src) == 0)
 373                 return True;
 374
 375         if(!prs_grow(dst, prs_offset(src)))
 376                 return False;
 377
 378         memcpy(&dst->data_p[dst->data_offset], src->data_p, (size_t)prs_offset(src));
 379         dst->data_offset += prs_offset(src);
 380
 381         return True;
 382 }
 383
 384 /*******************************************************************
 385  Append some data from one parse_struct into another.
 386  ********************************************************************/
 387
 388 BOOL prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, uint32 len)
 389 {
 390         if (len == 0)
 391                 return True;
 392
 393         if(!prs_grow(dst, len))
 394                 return False;
 395
 396         memcpy(&dst->data_p[dst->data_offset], src->data_p + start, (size_t)len);
 397         dst->data_offset += len;
 398
 399         return True;
 400 }
 401
 402 /*******************************************************************
 403  Append the data from a buffer into a parse_struct.
 404  ********************************************************************/
 405
 406 BOOL prs_copy_data_in(prs_struct *dst, const char *src, uint32 len)
 407 {
 408         if (len == 0)
 409                 return True;
 410
 411         if(!prs_grow(dst, len))
 412                 return False;
 413
 414         memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
 415         dst->data_offset += len;
 416
 417         return True;
 418 }
 419
 420 /*******************************************************************
 421  Copy some data from a parse_struct into a buffer.
 422  ********************************************************************/
 423
 424 BOOL prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
 425 {
 426         if (len == 0)
 427                 return True;
 428
 429         if(!prs_mem_get(src, len))
 430                 return False;
 431
 432         memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
 433         src->data_offset += len;
 434
 435         return True;
 436 }
 437
 438 /*******************************************************************
 439  Copy all the data from a parse_struct into a buffer.
 440  ********************************************************************/
 441
 442 BOOL prs_copy_all_data_out(char *dst, prs_struct *src)
 443 {
 444         uint32 len = prs_offset(src);
 445
 446         if (!len)
 447                 return True;
 448
 449         prs_set_offset(src, 0);
 450         return prs_copy_data_out(dst, src, len);
 451 }
 452
 453 /*******************************************************************
 454  Set the data as X-endian (external interface).
 455  ********************************************************************/
 456
 457 void prs_set_endian_data(prs_struct *ps, BOOL endian)
 458 {
 459         ps->bigendian_data = endian;
 460 }
 461
 462 /*******************************************************************
 463  Align a the data_len to a multiple of align bytes - filling with
 464  zeros.
 465  ********************************************************************/
 466
 467 BOOL prs_align(prs_struct *ps)
 468 {
 469         uint32 mod = ps->data_offset & (ps->align-1);
 470
 471         if (ps->align != 0 && mod != 0) {
 472                 uint32 extra_space = (ps->align - mod);
 473                 if(!prs_grow(ps, extra_space))
 474                         return False;
 475                 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
 476                 ps->data_offset += extra_space;
 477         }
 478
 479         return True;
 480 }
 481
 482 /******************************************************************
 483  Align on a 2 byte boundary
 484  *****************************************************************/
 485
 486 BOOL prs_align_uint16(prs_struct *ps)
 487 {
 488         BOOL ret;
 489         uint8 old_align = ps->align;
 490
 491         ps->align = 2;
 492         ret = prs_align(ps);
 493         ps->align = old_align;
 494
 495         return ret;
 496 }
 497
 498 /******************************************************************
 499  Align on a 8 byte boundary
 500  *****************************************************************/
 501
 502 BOOL prs_align_uint64(prs_struct *ps)
 503 {
 504         BOOL ret;
 505         uint8 old_align = ps->align;
 506
 507         ps->align = 8;
 508         ret = prs_align(ps);
 509         ps->align = old_align;
 510
 511         return ret;
 512 }
 513
 514 /*******************************************************************
 515  Align only if required (for the unistr2 string mainly)
 516  ********************************************************************/
 517
 518 BOOL prs_align_needed(prs_struct *ps, uint32 needed)
 519 {
 520         if (needed==0)
 521                 return True;
 522         else
 523                 return prs_align(ps);
 524 }
 525
 526 /*******************************************************************
 527  Ensure we can read/write to a given offset.
 528  ********************************************************************/
 529
 530 char *prs_mem_get(prs_struct *ps, uint32 extra_size)
 531 {
 532         if(UNMARSHALLING(ps)) {
 533                 /*
 534                  * If reading, ensure that we can read the requested size item.
 535                  */
 536                 if (ps->data_offset + extra_size > ps->buffer_size) {
 537                         DEBUG(0,("prs_mem_get: reading data of size %u would overrun "
 538                                 "buffer by %u bytes.\n",
 539                                 (unsigned int)extra_size,
 540                                 (unsigned int)(ps->data_offset + extra_size - ps->buffer_size) ));
 541                         return NULL;
 542                 }
 543         } else {
 544                 /*
 545                  * Writing - grow the buffer if needed.
 546                  */
 547                 if(!prs_grow(ps, extra_size))
 548                         return NULL;
 549         }
 550         return &ps->data_p[ps->data_offset];
 551 }
 552
 553 /*******************************************************************
 554  Change the struct type.
 555  ********************************************************************/
 556
 557 void prs_switch_type(prs_struct *ps, BOOL io)
 558 {
 559         if ((ps->io ^ io) == True)
 560                 ps->io=io;
 561 }
 562
 563 /*******************************************************************
 564  Force a prs_struct to be dynamic even when it's size is 0.
 565  ********************************************************************/
 566
 567 void prs_force_dynamic(prs_struct *ps)
 568 {
 569         ps->is_dynamic=True;
 570 }
 571
 572 /*******************************************************************
 573  Associate a session key with a parse struct.
 574  ********************************************************************/
 575
 576 void prs_set_session_key(prs_struct *ps, const char sess_key[16])
 577 {
 578         ps->sess_key = sess_key;
 579 }
 580
 581 /*******************************************************************
 582  Stream a uint8.
 583  ********************************************************************/
 584
 585 BOOL prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
 586 {
 587         char *q = prs_mem_get(ps, 1);
 588         if (q == NULL)
 589                 return False;
 590
 591     if (UNMARSHALLING(ps))
 592                 *data8 = CVAL(q,0);
 593         else
 594                 SCVAL(q,0,*data8);
 595
 596     DEBUG(5,("%s%04x %s: %02x\n", tab_depth(depth), ps->data_offset, name, *data8));
 597
 598         ps->data_offset += 1;
 599
 600         return True;
 601 }
 602
 603 /*******************************************************************
 604  Stream a uint16* (allocate memory if unmarshalling)
 605  ********************************************************************/
 606
 607 BOOL prs_pointer( const char *name, prs_struct *ps, int depth,
 608                  void **data, size_t data_size,
 609                  BOOL(*prs_fn)(const char*, prs_struct*, int, void*) )
 610 {
 611         uint32 data_p;
 612
 613         /* output f000baaa to stream if the pointer is non-zero. */
 614
 615         data_p = *data ? 0xf000baaa : 0;
 616
 617         if ( !prs_uint32("ptr", ps, depth, &data_p ))
 618                 return False;
 619
 620         /* we're done if there is no data */
 621
 622         if ( !data_p )
 623                 return True;
 624
 625         if (UNMARSHALLING(ps)) {
 626                 if ( !(*data = PRS_ALLOC_MEM_VOID(ps, data_size)) )
 627                         return False;
 628         }
 629
 630         return prs_fn(name, ps, depth, *data);
 631 }
 632
 633
 634 /*******************************************************************
 635  Stream a uint16.
 636  ********************************************************************/
 637
 638 BOOL prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
 639 {
 640         char *q = prs_mem_get(ps, sizeof(uint16));
 641         if (q == NULL)
 642                 return False;
 643
 644         if (UNMARSHALLING(ps)) {
 645                 if (ps->bigendian_data)
 646                         *data16 = RSVAL(q,0);
 647                 else
 648                         *data16 = SVAL(q,0);
 649         } else {
 650                 if (ps->bigendian_data)
 651                         RSSVAL(q,0,*data16);
 652                 else
 653                         SSVAL(q,0,*data16);
 654         }
 655
 656         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));
 657
 658         ps->data_offset += sizeof(uint16);
 659
 660         return True;
 661 }
 662
 663 /*******************************************************************
 664  Stream a uint32.
 665  ********************************************************************/
 666
 667 BOOL prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
 668 {
 669         char *q = prs_mem_get(ps, sizeof(uint32));
 670         if (q == NULL)
 671                 return False;
 672
 673         if (UNMARSHALLING(ps)) {
 674                 if (ps->bigendian_data)
 675                         *data32 = RIVAL(q,0);
 676                 else
 677                         *data32 = IVAL(q,0);
 678         } else {
 679                 if (ps->bigendian_data)
 680                         RSIVAL(q,0,*data32);
 681                 else
 682                         SIVAL(q,0,*data32);
 683         }
 684
 685         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 686
 687         ps->data_offset += sizeof(uint32);
 688
 689         return True;
 690 }
 691
 692 /*******************************************************************
 693  Stream a NTSTATUS
 694  ********************************************************************/
 695
 696 BOOL prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 697 {
 698         char *q = prs_mem_get(ps, sizeof(uint32));
 699         if (q == NULL)
 700                 return False;
 701
 702         if (UNMARSHALLING(ps)) {
 703                 if (ps->bigendian_data)
 704                         *status = NT_STATUS(RIVAL(q,0));
 705                 else
 706                         *status = NT_STATUS(IVAL(q,0));
 707         } else {
 708                 if (ps->bigendian_data)
 709                         RSIVAL(q,0,NT_STATUS_V(*status));
 710                 else
 711                         SIVAL(q,0,NT_STATUS_V(*status));
 712         }
 713
 714         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 715                  nt_errstr(*status)));
 716
 717         ps->data_offset += sizeof(uint32);
 718
 719         return True;
 720 }
 721
 722 /*******************************************************************
 723  Stream a WERROR
 724  ********************************************************************/
 725
 726 BOOL prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 727 {
 728         char *q = prs_mem_get(ps, sizeof(uint32));
 729         if (q == NULL)
 730                 return False;
 731
 732         if (UNMARSHALLING(ps)) {
 733                 if (ps->bigendian_data)
 734                         *status = W_ERROR(RIVAL(q,0));
 735                 else
 736                         *status = W_ERROR(IVAL(q,0));
 737         } else {
 738                 if (ps->bigendian_data)
 739                         RSIVAL(q,0,W_ERROR_V(*status));
 740                 else
 741                         SIVAL(q,0,W_ERROR_V(*status));
 742         }
 743
 744         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 745                  dos_errstr(*status)));
 746
 747         ps->data_offset += sizeof(uint32);
 748
 749         return True;
 750 }
 751
 752
 753 /******************************************************************
 754  Stream an array of uint8s. Length is number of uint8s.
 755  ********************************************************************/
 756
 757 BOOL prs_uint8s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 758 {
 759         int i;
 760         char *q = prs_mem_get(ps, len);
 761         if (q == NULL)
 762                 return False;
 763
 764         if (UNMARSHALLING(ps)) {
 765                 for (i = 0; i < len; i++)
 766                         data8s[i] = CVAL(q,i);
 767         } else {
 768                 for (i = 0; i < len; i++)
 769                         SCVAL(q, i, data8s[i]);
 770         }
 771
 772         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
 773         if (charmode)
 774                 print_asc(5, (unsigned char*)data8s, len);
 775         else {
 776                 for (i = 0; i < len; i++)
 777                         DEBUG(5,("%02x ", data8s[i]));
 778         }
 779         DEBUG(5,("\n"));
 780
 781         ps->data_offset += len;
 782
 783         return True;
 784 }
 785
 786 /******************************************************************
 787  Stream an array of uint16s. Length is number of uint16s.
 788  ********************************************************************/
 789
 790 BOOL prs_uint16s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 791 {
 792         int i;
 793         char *q = prs_mem_get(ps, len * sizeof(uint16));
 794         if (q == NULL)
 795                 return False;
 796
 797         if (UNMARSHALLING(ps)) {
 798                 if (ps->bigendian_data) {
 799                         for (i = 0; i < len; i++)
 800                                 data16s[i] = RSVAL(q, 2*i);
 801                 } else {
 802                         for (i = 0; i < len; i++)
 803                                 data16s[i] = SVAL(q, 2*i);
 804                 }
 805         } else {
 806                 if (ps->bigendian_data) {
 807                         for (i = 0; i < len; i++)
 808                                 RSSVAL(q, 2*i, data16s[i]);
 809                 } else {
 810                         for (i = 0; i < len; i++)
 811                                 SSVAL(q, 2*i, data16s[i]);
 812                 }
 813         }
 814
 815         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 816         if (charmode)
 817                 print_asc(5, (unsigned char*)data16s, 2*len);
 818         else {
 819                 for (i = 0; i < len; i++)
 820                         DEBUG(5,("%04x ", data16s[i]));
 821         }
 822         DEBUG(5,("\n"));
 823
 824         ps->data_offset += (len * sizeof(uint16));
 825
 826         return True;
 827 }
 828
 829 /******************************************************************
 830  Start using a function for streaming unicode chars. If unmarshalling,
 831  output must be little-endian, if marshalling, input must be little-endian.
 832  ********************************************************************/
 833
 834 static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
 835                                                         char *in_buf, char *out_buf, int len)
 836 {
 837         int i;
 838
 839         if (UNMARSHALLING(ps)) {
 840                 if (ps->bigendian_data) {
 841                         for (i = 0; i < len; i++)
 842                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 843                 } else {
 844                         for (i = 0; i < len; i++)
 845                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 846                 }
 847         } else {
 848                 if (ps->bigendian_data) {
 849                         for (i = 0; i < len; i++)
 850                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 851                 } else {
 852                         for (i = 0; i < len; i++)
 853                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 854                 }
 855         }
 856
 857         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 858         if (charmode)
 859                 print_asc(5, (unsigned char*)out_buf, 2*len);
 860         else {
 861                 for (i = 0; i < len; i++)
 862                         DEBUG(5,("%04x ", out_buf[i]));
 863         }
 864         DEBUG(5,("\n"));
 865 }
 866
 867 /******************************************************************
 868  Stream a unistr. Always little endian.
 869  ********************************************************************/
 870
 871 BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 872 {
 873         char *q = prs_mem_get(ps, len * sizeof(uint16));
 874         if (q == NULL)
 875                 return False;
 876
 877         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 878         ps->data_offset += (len * sizeof(uint16));
 879
 880         return True;
 881 }
 882
 883 /******************************************************************
 884  Stream an array of uint32s. Length is number of uint32s.
 885  ********************************************************************/
 886
 887 BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 888 {
 889         int i;
 890         char *q = prs_mem_get(ps, len * sizeof(uint32));
 891         if (q == NULL)
 892                 return False;
 893
 894         if (UNMARSHALLING(ps)) {
 895                 if (ps->bigendian_data) {
 896                         for (i = 0; i < len; i++)
 897                                 data32s[i] = RIVAL(q, 4*i);
 898                 } else {
 899                         for (i = 0; i < len; i++)
 900                                 data32s[i] = IVAL(q, 4*i);
 901                 }
 902         } else {
 903                 if (ps->bigendian_data) {
 904                         for (i = 0; i < len; i++)
 905                                 RSIVAL(q, 4*i, data32s[i]);
 906                 } else {
 907                         for (i = 0; i < len; i++)
 908                                 SIVAL(q, 4*i, data32s[i]);
 909                 }
 910         }
 911
 912         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 913         if (charmode)
 914                 print_asc(5, (unsigned char*)data32s, 4*len);
 915         else {
 916                 for (i = 0; i < len; i++)
 917                         DEBUG(5,("%08x ", data32s[i]));
 918         }
 919         DEBUG(5,("\n"));
 920
 921         ps->data_offset += (len * sizeof(uint32));
 922
 923         return True;
 924 }
 925
 926 /******************************************************************
 927  Stream an array of unicode string, length/buffer specified separately,
 928  in uint16 chars. The unicode string is already in little-endian format.
 929  ********************************************************************/
 930
 931 BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
 932 {
 933         char *p;
 934         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
 935         if (q == NULL)
 936                 return False;
 937
 938         if (UNMARSHALLING(ps)) {
 939                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
 940                 if (str->buffer == NULL)
 941                         return False;
 942         }
 943
 944         /* If the string is empty, we don't have anything to stream */
 945         if (str->buf_len==0)
 946                 return True;
 947
 948         p = (char *)str->buffer;
 949
 950         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
 951
 952         ps->data_offset += (str->buf_len * sizeof(uint16));
 953
 954         return True;
 955 }
 956
 957 /******************************************************************
 958  Stream a "not" unicode string, length/buffer specified separately,
 959  in byte chars. String is in little-endian format.
 960  ********************************************************************/
 961
 962 BOOL prs_regval_buffer(BOOL charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
 963 {
 964         char *p;
 965         char *q = prs_mem_get(ps, buf->buf_len);
 966         if (q == NULL)
 967                 return False;
 968
 969         if (UNMARSHALLING(ps)) {
 970                 if (buf->buf_len > buf->buf_max_len) {
 971                         return False;
 972                 }
 973                 if ( buf->buf_max_len ) {
 974                         buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
 975                         if ( buf->buffer == NULL )
 976                                 return False;
 977                 }
 978         }
 979
 980         p = (char *)buf->buffer;
 981
 982         dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
 983         ps->data_offset += buf->buf_len;
 984
 985         return True;
 986 }
 987
 988 /******************************************************************
 989  Stream a string, length/buffer specified separately,
 990  in uint8 chars.
 991  ********************************************************************/
 992
 993 BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
 994 {
 995         unsigned int i;
 996         char *q = prs_mem_get(ps, str->str_str_len);
 997         if (q == NULL)
 998                 return False;
 999
1000         if (UNMARSHALLING(ps)) {
1001                 if (str->str_str_len > str->str_max_len) {
1002                         return False;
1003                 }
1004                 str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
1005                 if (str->buffer == NULL)
1006                         return False;
1007         }
1008
1009         if (UNMARSHALLING(ps)) {
1010                 for (i = 0; i < str->str_str_len; i++)
1011                         str->buffer[i] = CVAL(q,i);
1012         } else {
1013                 for (i = 0; i < str->str_str_len; i++)
1014                         SCVAL(q, i, str->buffer[i]);
1015         }
1016
1017         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1018         if (charmode)
1019                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
1020         else {
1021                 for (i = 0; i < str->str_str_len; i++)
1022                         DEBUG(5,("%02x ", str->buffer[i]));
1023         }
1024         DEBUG(5,("\n"));
1025
1026         ps->data_offset += str->str_str_len;
1027
1028         return True;
1029 }
1030
1031 /******************************************************************
1032  Stream a unicode string, length/buffer specified separately,
1033  in uint16 chars. The unicode string is already in little-endian format.
1034  ********************************************************************/
1035
1036 BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1037 {
1038         char *p;
1039         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1040         if (q == NULL)
1041                 return False;
1042
1043         /* If the string is empty, we don't have anything to stream */
1044         if (str->uni_str_len==0)
1045                 return True;
1046
1047         if (UNMARSHALLING(ps)) {
1048                 if (str->uni_str_len > str->uni_max_len) {
1049                         return False;
1050                 }
1051                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1052                 if (str->buffer == NULL)
1053                         return False;
1054         }
1055
1056         p = (char *)str->buffer;
1057
1058         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1059
1060         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1061
1062         return True;
1063 }
1064
1065 /******************************************************************
1066  Stream a unicode string, length/buffer specified separately,
1067  in uint16 chars. The unicode string is already in little-endian format.
1068  ********************************************************************/
1069
1070 BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1071 {
1072         char *p;
1073         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1074         if (q == NULL)
1075                 return False;
1076
1077         if (UNMARSHALLING(ps)) {
1078                 str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1079                 if (str->str.buffer == NULL)
1080                         return False;
1081         }
1082
1083         p = (char *)str->str.buffer;
1084
1085         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1086         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1087
1088         return True;
1089 }
1090
1091 /*******************************************************************
1092  Stream a unicode  null-terminated string. As the string is already
1093  in little-endian format then do it as a stream of bytes.
1094  ********************************************************************/
1095
1096 BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1097 {
1098         unsigned int len = 0;
1099         unsigned char *p = (unsigned char *)str->buffer;
1100         uint8 *start;
1101         char *q;
1102         uint32 max_len;
1103         uint16* ptr;
1104
1105         if (MARSHALLING(ps)) {
1106
1107                 for(len = 0; str->buffer[len] != 0; len++)
1108                         ;
1109
1110                 q = prs_mem_get(ps, (len+1)*2);
1111                 if (q == NULL)
1112                         return False;
1113
1114                 start = (uint8*)q;
1115
1116                 for(len = 0; str->buffer[len] != 0; len++) {
1117                         if(ps->bigendian_data) {
1118                                 /* swap bytes - p is little endian, q is big endian. */
1119                                 q[0] = (char)p[1];
1120                                 q[1] = (char)p[0];
1121                                 p += 2;
1122                                 q += 2;
1123                         }
1124                         else
1125                         {
1126                                 q[0] = (char)p[0];
1127                                 q[1] = (char)p[1];
1128                                 p += 2;
1129                                 q += 2;
1130                         }
1131                 }
1132
1133                 /*
1134                  * even if the string is 'empty' (only an \0 char)
1135                  * at this point the leading \0 hasn't been parsed.
1136                  * so parse it now
1137                  */
1138
1139                 q[0] = 0;
1140                 q[1] = 0;
1141                 q += 2;
1142
1143                 len++;
1144
1145                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1146                 print_asc(5, (unsigned char*)start, 2*len);
1147                 DEBUG(5, ("\n"));
1148         }
1149         else { /* unmarshalling */
1150
1151                 uint32 alloc_len = 0;
1152                 q = ps->data_p + prs_offset(ps);
1153
1154                 /*
1155                  * Work out how much space we need and talloc it.
1156                  */
1157                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1158
1159                 /* the test of the value of *ptr helps to catch the circumstance
1160                    where we have an emtpty (non-existent) string in the buffer */
1161                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1162                         /* do nothing */
1163                         ;
1164
1165                 if (alloc_len < max_len)
1166                         alloc_len += 1;
1167
1168                 /* should we allocate anything at all? */
1169                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1170                 if ((str->buffer == NULL) && (alloc_len > 0))
1171                         return False;
1172
1173                 p = (unsigned char *)str->buffer;
1174
1175                 len = 0;
1176                 /* the (len < alloc_len) test is to prevent us from overwriting
1177                    memory that is not ours...if we get that far, we have a non-null
1178                    terminated string in the buffer and have messed up somewhere */
1179                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1180                         if(ps->bigendian_data)
1181                         {
1182                                 /* swap bytes - q is big endian, p is little endian. */
1183                                 p[0] = (unsigned char)q[1];
1184                                 p[1] = (unsigned char)q[0];
1185                                 p += 2;
1186                                 q += 2;
1187                         } else {
1188
1189                                 p[0] = (unsigned char)q[0];
1190                                 p[1] = (unsigned char)q[1];
1191                                 p += 2;
1192                                 q += 2;
1193                         }
1194
1195                         len++;
1196                 }
1197                 if (len < alloc_len) {
1198                         /* NULL terminate the UNISTR */
1199                         str->buffer[len++] = '\0';
1200                 }
1201
1202                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1203                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1204                 DEBUG(5, ("\n"));
1205         }
1206
1207         /* set the offset in the prs_struct; 'len' points to the
1208            terminiating NULL in the UNISTR so we need to go one more
1209            uint16 */
1210         ps->data_offset += (len)*2;
1211
1212         return True;
1213 }
1214
1215
1216 /*******************************************************************
1217  Stream a null-terminated string.  len is strlen, and therefore does
1218  not include the null-termination character.
1219  ********************************************************************/
1220
1221 BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1222 {
1223         char *q;
1224         int i;
1225         int len;
1226
1227         if (UNMARSHALLING(ps))
1228                 len = strlen(&ps->data_p[ps->data_offset]);
1229         else
1230                 len = strlen(str);
1231
1232         len = MIN(len, (max_buf_size-1));
1233
1234         q = prs_mem_get(ps, len+1);
1235         if (q == NULL)
1236                 return False;
1237
1238         for(i = 0; i < len; i++) {
1239                 if (UNMARSHALLING(ps))
1240                         str[i] = q[i];
1241                 else
1242                         q[i] = str[i];
1243         }
1244
1245         /* The terminating null. */
1246         str[i] = '\0';
1247
1248         if (MARSHALLING(ps)) {
1249                 q[i] = '\0';
1250         }
1251
1252         ps->data_offset += len+1;
1253
1254         dump_data(5+depth, q, len);
1255
1256         return True;
1257 }
1258
1259 BOOL prs_string_alloc(const char *name, prs_struct *ps, int depth,
1260                       const char **str)
1261 {
1262         size_t len;
1263         char *tmp_str;
1264
1265         if (UNMARSHALLING(ps))
1266                 len = strlen(&ps->data_p[ps->data_offset]);
1267         else
1268                 len = strlen(*str);
1269
1270         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1271
1272         if (tmp_str == NULL)
1273                 return False;
1274
1275         if (MARSHALLING(ps))
1276                 strncpy(tmp_str, *str, len);
1277
1278         if (!prs_string(name, ps, depth, tmp_str, len+1))
1279                 return False;
1280
1281         *str = tmp_str;
1282         return True;
1283 }
1284
1285 /*******************************************************************
1286  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1287  uint16 should be stored, or gets the size if reading.
1288  ********************************************************************/
1289
1290 BOOL prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1291 {
1292         *offset = ps->data_offset;
1293         if (UNMARSHALLING(ps)) {
1294                 /* reading. */
1295                 return prs_uint16(name, ps, depth, data16);
1296         } else {
1297                 char *q = prs_mem_get(ps, sizeof(uint16));
1298                 if(q ==NULL)
1299                         return False;
1300                 ps->data_offset += sizeof(uint16);
1301         }
1302         return True;
1303 }
1304
1305 /*******************************************************************
1306  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1307  does nothing on reading, as that is already handled by ...._pre()
1308  ********************************************************************/
1309
1310 BOOL prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1311                                 uint32 ptr_uint16, uint32 start_offset)
1312 {
1313         if (MARSHALLING(ps)) {
1314                 /*
1315                  * Writing - temporarily move the offset pointer.
1316                  */
1317                 uint16 data_size = ps->data_offset - start_offset;
1318                 uint32 old_offset = ps->data_offset;
1319
1320                 ps->data_offset = ptr_uint16;
1321                 if(!prs_uint16(name, ps, depth, &data_size)) {
1322                         ps->data_offset = old_offset;
1323                         return False;
1324                 }
1325                 ps->data_offset = old_offset;
1326         } else {
1327                 ps->data_offset = start_offset + (uint32)(*data16);
1328         }
1329         return True;
1330 }
1331
1332 /*******************************************************************
1333  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1334  uint32 should be stored, or gets the size if reading.
1335  ********************************************************************/
1336
1337 BOOL prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1338 {
1339         *offset = ps->data_offset;
1340         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1341                 /* reading. */
1342                 return prs_uint32(name, ps, depth, data32);
1343         } else {
1344                 ps->data_offset += sizeof(uint32);
1345         }
1346         return True;
1347 }
1348
1349 /*******************************************************************
1350  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1351  does nothing on reading, as that is already handled by ...._pre()
1352  ********************************************************************/
1353
1354 BOOL prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1355                                 uint32 ptr_uint32, uint32 data_size)
1356 {
1357         if (MARSHALLING(ps)) {
1358                 /*
1359                  * Writing - temporarily move the offset pointer.
1360                  */
1361                 uint32 old_offset = ps->data_offset;
1362                 ps->data_offset = ptr_uint32;
1363                 if(!prs_uint32(name, ps, depth, &data_size)) {
1364                         ps->data_offset = old_offset;
1365                         return False;
1366                 }
1367                 ps->data_offset = old_offset;
1368         }
1369         return True;
1370 }
1371
1372 /* useful function to store a structure in rpc wire format */
1373 int tdb_prs_store(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
1374 {
1375     TDB_DATA kbuf, dbuf;
1376     kbuf.dptr = keystr;
1377     kbuf.dsize = strlen(keystr)+1;
1378     dbuf.dptr = ps->data_p;
1379     dbuf.dsize = prs_offset(ps);
1380     return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
1381 }
1382
1383 /* useful function to fetch a structure into rpc wire format */
1384 int tdb_prs_fetch(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
1385 {
1386     TDB_DATA kbuf, dbuf;
1387     kbuf.dptr = keystr;
1388     kbuf.dsize = strlen(keystr)+1;
1389
1390     dbuf = tdb_fetch(tdb, kbuf);
1391     if (!dbuf.dptr)
1392             return -1;
1393
1394     prs_init(ps, 0, mem_ctx, UNMARSHALL);
1395     prs_give_memory(ps, dbuf.dptr, dbuf.dsize, True);
1396
1397     return 0;
1398 }
1399
1400 /*******************************************************************
1401  hash a stream.
1402  ********************************************************************/
1403
1404 BOOL prs_hash1(prs_struct *ps, uint32 offset, int len)
1405 {
1406         char *q;
1407
1408         q = ps->data_p;
1409         q = &q[offset];
1410
1411 #ifdef DEBUG_PASSWORD
1412         DEBUG(100, ("prs_hash1\n"));
1413         dump_data(100, ps->sess_key, 16);
1414         dump_data(100, q, len);
1415 #endif
1416         SamOEMhash((uchar *) q, ps->sess_key, len);
1417
1418 #ifdef DEBUG_PASSWORD
1419         dump_data(100, q, len);
1420 #endif
1421
1422         return True;
1423 }
1424
1425 /*******************************************************************
1426  Create a digest over the entire packet (including the data), and
1427  MD5 it with the session key.
1428  ********************************************************************/
1429
1430 static void schannel_digest(struct schannel_auth_struct *a,
1431                           enum pipe_auth_level auth_level,
1432                           RPC_AUTH_SCHANNEL_CHK * verf,
1433                           char *data, size_t data_len,
1434                           uchar digest_final[16])
1435 {
1436         uchar whole_packet_digest[16];
1437         static uchar zeros[4];
1438         struct MD5Context ctx3;
1439
1440         /* verfiy the signature on the packet by MD5 over various bits */
1441         MD5Init(&ctx3);
1442         /* use our sequence number, which ensures the packet is not
1443            out of order */
1444         MD5Update(&ctx3, zeros, sizeof(zeros));
1445         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1446         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1447                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1448         }
1449         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1450         MD5Final(whole_packet_digest, &ctx3);
1451         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1452
1453         /* MD5 this result and the session key, to prove that
1454            only a valid client could had produced this */
1455         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1456 }
1457
1458 /*******************************************************************
1459  Calculate the key with which to encode the data payload
1460  ********************************************************************/
1461
1462 static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1463                                    RPC_AUTH_SCHANNEL_CHK *verf,
1464                                    uchar sealing_key[16])
1465 {
1466         static uchar zeros[4];
1467         uchar digest2[16];
1468         uchar sess_kf0[16];
1469         int i;
1470
1471         for (i = 0; i < sizeof(sess_kf0); i++) {
1472                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1473         }
1474
1475         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1476
1477         /* MD5 of sess_kf0 and 4 zero bytes */
1478         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1479         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1480
1481         /* MD5 of the above result, plus 8 bytes of sequence number */
1482         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1483         dump_data_pw("sealing_key:\n", sealing_key, 16);
1484 }
1485
1486 /*******************************************************************
1487  Encode or Decode the sequence number (which is symmetric)
1488  ********************************************************************/
1489
1490 static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1491                                      RPC_AUTH_SCHANNEL_CHK *verf)
1492 {
1493         static uchar zeros[4];
1494         uchar sequence_key[16];
1495         uchar digest1[16];
1496
1497         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1498         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1499
1500         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1501
1502         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1503
1504         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1505         SamOEMhash(verf->seq_num, sequence_key, 8);
1506         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1507 }
1508
1509 /*******************************************************************
1510 creates an RPC_AUTH_SCHANNEL_CHK structure.
1511 ********************************************************************/
1512
1513 static BOOL init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1514                               const uchar sig[8],
1515                               const uchar packet_digest[8],
1516                               const uchar seq_num[8], const uchar confounder[8])
1517 {
1518         if (chk == NULL)
1519                 return False;
1520
1521         memcpy(chk->sig, sig, sizeof(chk->sig));
1522         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1523         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1524         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1525
1526         return True;
1527 }
1528
1529 /*******************************************************************
1530  Encode a blob of data using the schannel alogrithm, also produceing
1531  a checksum over the original data.  We currently only support
1532  signing and sealing togeather - the signing-only code is close, but not
1533  quite compatible with what MS does.
1534  ********************************************************************/
1535
1536 void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1537                    enum schannel_direction direction,
1538                    RPC_AUTH_SCHANNEL_CHK * verf,
1539                    char *data, size_t data_len)
1540 {
1541         uchar digest_final[16];
1542         uchar confounder[8];
1543         uchar seq_num[8];
1544         static const uchar nullbytes[8];
1545
1546         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1547         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1548         const uchar *schannel_sig = NULL;
1549
1550         DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1551
1552         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1553                 schannel_sig = schannel_seal_sig;
1554         } else {
1555                 schannel_sig = schannel_sign_sig;
1556         }
1557
1558         /* fill the 'confounder' with random data */
1559         generate_random_buffer(confounder, sizeof(confounder));
1560
1561         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1562
1563         RSIVAL(seq_num, 0, a->seq_num);
1564
1565         switch (direction) {
1566         case SENDER_IS_INITIATOR:
1567                 SIVAL(seq_num, 4, 0x80);
1568                 break;
1569         case SENDER_IS_ACCEPTOR:
1570                 SIVAL(seq_num, 4, 0x0);
1571                 break;
1572         }
1573
1574         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1575
1576         init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1577                                  seq_num, confounder);
1578
1579         /* produce a digest of the packet to prove it's legit (before we seal it) */
1580         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1581         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1582
1583         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1584                 uchar sealing_key[16];
1585
1586                 /* get the key to encode the data with */
1587                 schannel_get_sealing_key(a, verf, sealing_key);
1588
1589                 /* encode the verification data */
1590                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1591                 SamOEMhash(verf->confounder, sealing_key, 8);
1592
1593                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1594
1595                 /* encode the packet payload */
1596                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1597                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1598                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1599         }
1600
1601         /* encode the sequence number (key based on packet digest) */
1602         /* needs to be done after the sealing, as the original version
1603            is used in the sealing stuff... */
1604         schannel_deal_with_seq_num(a, verf);
1605
1606         return;
1607 }
1608
1609 /*******************************************************************
1610  Decode a blob of data using the schannel alogrithm, also verifiying
1611  a checksum over the original data.  We currently can verify signed messages,
1612  as well as decode sealed messages
1613  ********************************************************************/
1614
1615 BOOL schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1616                    enum schannel_direction direction,
1617                    RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1618 {
1619         uchar digest_final[16];
1620
1621         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1622         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1623         const uchar *schannel_sig = NULL;
1624
1625         uchar seq_num[8];
1626
1627         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1628
1629         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1630                 schannel_sig = schannel_seal_sig;
1631         } else {
1632                 schannel_sig = schannel_sign_sig;
1633         }
1634
1635         /* Create the expected sequence number for comparison */
1636         RSIVAL(seq_num, 0, a->seq_num);
1637
1638         switch (direction) {
1639         case SENDER_IS_INITIATOR:
1640                 SIVAL(seq_num, 4, 0x80);
1641                 break;
1642         case SENDER_IS_ACCEPTOR:
1643                 SIVAL(seq_num, 4, 0x0);
1644                 break;
1645         }
1646
1647         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1648         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1649
1650         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1651
1652         /* extract the sequence number (key based on supplied packet digest) */
1653         /* needs to be done before the sealing, as the original version
1654            is used in the sealing stuff... */
1655         schannel_deal_with_seq_num(a, verf);
1656
1657         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1658                 /* don't even bother with the below if the sequence number is out */
1659                 /* The sequence number is MD5'ed with a key based on the whole-packet
1660                    digest, as supplied by the client.  We check that it's a valid
1661                    checksum after the decode, below
1662                 */
1663                 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1664                 dump_data(2, (const char*)verf->seq_num, sizeof(verf->seq_num));
1665                 DEBUG(2, ("should be:\n"));
1666                 dump_data(2, (const char*)seq_num, sizeof(seq_num));
1667
1668                 return False;
1669         }
1670
1671         if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1672                 /* Validate that the other end sent the expected header */
1673                 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1674                 dump_data(2, (const char*)verf->sig, sizeof(verf->sig));
1675                 DEBUG(2, ("should be:\n"));
1676                 dump_data(2, (const char*)schannel_sig, sizeof(schannel_sig));
1677                 return False;
1678         }
1679
1680         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1681                 uchar sealing_key[16];
1682
1683                 /* get the key to extract the data with */
1684                 schannel_get_sealing_key(a, verf, sealing_key);
1685
1686                 /* extract the verification data */
1687                 dump_data_pw("verf->confounder:\n", verf->confounder,
1688                              sizeof(verf->confounder));
1689                 SamOEMhash(verf->confounder, sealing_key, 8);
1690
1691                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1692                              sizeof(verf->confounder));
1693
1694                 /* extract the packet payload */
1695                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1696                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1697                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1698         }
1699
1700         /* digest includes 'data' after unsealing */
1701         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1702
1703         dump_data_pw("Calculated digest:\n", digest_final,
1704                      sizeof(digest_final));
1705         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1706                      sizeof(verf->packet_digest));
1707
1708         /* compare - if the client got the same result as us, then
1709            it must know the session key */
1710         return (memcmp(digest_final, verf->packet_digest,
1711                        sizeof(verf->packet_digest)) == 0);
1712 }