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 3 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, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_RPC_PARSE
  27
  28 /**
  29  * Dump a prs to a file: from the current location through to the end.
  30  **/
  31 void prs_dump(char *name, int v, prs_struct *ps)
  32 {
  33         prs_dump_region(name, v, ps, ps->data_offset, ps->buffer_size);
  34 }
  35
  36 /**
  37  * Dump from the start of the prs to the current location.
  38  **/
  39 void prs_dump_before(char *name, int v, prs_struct *ps)
  40 {
  41         prs_dump_region(name, v, ps, 0, ps->data_offset);
  42 }
  43
  44 /**
  45  * Dump everything from the start of the prs up to the current location.
  46  **/
  47 void prs_dump_region(char *name, int v, prs_struct *ps,
  48                      int from_off, int to_off)
  49 {
  50         int fd, i;
  51         pstring fname;
  52         ssize_t sz;
  53         if (DEBUGLEVEL < 50) return;
  54         for (i=1;i<100;i++) {
  55                 if (v != -1) {
  56                         slprintf(fname,sizeof(fname)-1, "/tmp/%s_%d.%d.prs", name, v, i);
  57                 } else {
  58                         slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.prs", name, i);
  59                 }
  60                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
  61                 if (fd != -1 || errno != EEXIST) break;
  62         }
  63         if (fd != -1) {
  64                 sz = write(fd, ps->data_p + from_off, to_off - from_off);
  65                 i = close(fd);
  66                 if ( (sz != to_off-from_off) || (i != 0) ) {
  67                         DEBUG(0,("Error writing/closing %s: %ld!=%ld %d\n", fname, (unsigned long)sz, (unsigned long)to_off-from_off, i ));
  68                 } else {
  69                         DEBUG(0,("created %s\n", fname));
  70                 }
  71         }
  72 }
  73
  74 /*******************************************************************
  75  Debug output for parsing info
  76
  77  XXXX side-effect of this function is to increase the debug depth XXXX.
  78
  79 ********************************************************************/
  80
  81 void prs_debug(prs_struct *ps, int depth, const char *desc, const char *fn_name)
  82 {
  83         DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(depth), ps->data_offset, fn_name, desc));
  84 }
  85
  86 /**
  87  * Initialise an expandable parse structure.
  88  *
  89  * @param size Initial buffer size.  If >0, a new buffer will be
  90  * created with malloc().
  91  *
  92  * @return False if allocation fails, otherwise True.
  93  **/
  94
  95 BOOL prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, BOOL io)
  96 {
  97         ZERO_STRUCTP(ps);
  98         ps->io = io;
  99         ps->bigendian_data = RPC_LITTLE_ENDIAN;
 100         ps->align = RPC_PARSE_ALIGN;
 101         ps->is_dynamic = False;
 102         ps->data_offset = 0;
 103         ps->buffer_size = 0;
 104         ps->data_p = NULL;
 105         ps->mem_ctx = ctx;
 106
 107         if (size != 0) {
 108                 ps->buffer_size = size;
 109                 if((ps->data_p = (char *)SMB_MALLOC((size_t)size)) == NULL) {
 110                         DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
 111                         return False;
 112                 }
 113                 memset(ps->data_p, '\0', (size_t)size);
 114                 ps->is_dynamic = True; /* We own this memory. */
 115         } else if (MARSHALLING(ps)) {
 116                 /* If size is zero and we're marshalling we should allocate memory on demand. */
 117                 ps->is_dynamic = True;
 118         }
 119
 120         return True;
 121 }
 122
 123 /*******************************************************************
 124  Delete the memory in a parse structure - if we own it.
 125  ********************************************************************/
 126
 127 void prs_mem_free(prs_struct *ps)
 128 {
 129         if(ps->is_dynamic)
 130                 SAFE_FREE(ps->data_p);
 131         ps->is_dynamic = False;
 132         ps->buffer_size = 0;
 133         ps->data_offset = 0;
 134 }
 135
 136 /*******************************************************************
 137  Clear the memory in a parse structure.
 138  ********************************************************************/
 139
 140 void prs_mem_clear(prs_struct *ps)
 141 {
 142         if (ps->buffer_size)
 143                 memset(ps->data_p, '\0', (size_t)ps->buffer_size);
 144 }
 145
 146 /*******************************************************************
 147  Allocate memory when unmarshalling... Always zero clears.
 148  ********************************************************************/
 149
 150 #if defined(PARANOID_MALLOC_CHECKER)
 151 char *prs_alloc_mem_(prs_struct *ps, size_t size, unsigned int count)
 152 #else
 153 char *prs_alloc_mem(prs_struct *ps, size_t size, unsigned int count)
 154 #endif
 155 {
 156         char *ret = NULL;
 157
 158         if (size && count) {
 159                 /* We can't call the type-safe version here. */
 160                 ret = (char *)_talloc_zero_array_zeronull(ps->mem_ctx, size, count,
 161                                                  "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                 ps->buffer_size = newsize;
 211
 212                 /* newsize == 0 acts as a free and set pointer to NULL */
 213                 if (newsize == 0) {
 214                         SAFE_FREE(ps->data_p);
 215                 } else {
 216                         ps->data_p = (char *)SMB_REALLOC(ps->data_p, newsize);
 217
 218                         if (ps->data_p == NULL) {
 219                                 DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
 220                                         (unsigned int)newsize));
 221                                 DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
 222                                 return False;
 223                         }
 224                 }
 225         }
 226
 227         return True;
 228 }
 229
 230 /*******************************************************************
 231  Attempt, if needed, to grow a data buffer.
 232  Also depends on the data stream mode (io).
 233  ********************************************************************/
 234
 235 BOOL prs_grow(prs_struct *ps, uint32 extra_space)
 236 {
 237         uint32 new_size;
 238
 239         ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
 240
 241         if(ps->data_offset + extra_space <= ps->buffer_size)
 242                 return True;
 243
 244         /*
 245          * We cannot grow the buffer if we're not reading
 246          * into the prs_struct, or if we don't own the memory.
 247          */
 248
 249         if(UNMARSHALLING(ps) || !ps->is_dynamic) {
 250                 DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 251                                 (unsigned int)extra_space));
 252                 return False;
 253         }
 254
 255         /*
 256          * Decide how much extra space we really need.
 257          */
 258
 259         extra_space -= (ps->buffer_size - ps->data_offset);
 260         if(ps->buffer_size == 0) {
 261                 /*
 262                  * Ensure we have at least a PDU's length, or extra_space, whichever
 263                  * is greater.
 264                  */
 265
 266                 new_size = MAX(RPC_MAX_PDU_FRAG_LEN,extra_space);
 267
 268                 if((ps->data_p = (char *)SMB_MALLOC(new_size)) == NULL) {
 269                         DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
 270                         return False;
 271                 }
 272                 memset(ps->data_p, '\0', (size_t)new_size );
 273         } else {
 274                 /*
 275                  * If the current buffer size is bigger than the space needed, just
 276                  * double it, else add extra_space.
 277                  */
 278                 new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);
 279
 280                 if ((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 281                         DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
 282                                 (unsigned int)new_size));
 283                         return False;
 284                 }
 285
 286                 memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 287         }
 288         ps->buffer_size = new_size;
 289
 290         return True;
 291 }
 292
 293 /*******************************************************************
 294  Attempt to force a data buffer to grow by len bytes.
 295  This is only used when appending more data onto a prs_struct
 296  when reading an rpc reply, before unmarshalling it.
 297  ********************************************************************/
 298
 299 BOOL prs_force_grow(prs_struct *ps, uint32 extra_space)
 300 {
 301         uint32 new_size = ps->buffer_size + extra_space;
 302
 303         if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
 304                 DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 305                                 (unsigned int)extra_space));
 306                 return False;
 307         }
 308
 309         if((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 310                 DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
 311                         (unsigned int)new_size));
 312                 return False;
 313         }
 314
 315         memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 316
 317         ps->buffer_size = new_size;
 318
 319         return True;
 320 }
 321
 322 /*******************************************************************
 323  Get the data pointer (external interface).
 324 ********************************************************************/
 325
 326 char *prs_data_p(prs_struct *ps)
 327 {
 328         return ps->data_p;
 329 }
 330
 331 /*******************************************************************
 332  Get the current data size (external interface).
 333  ********************************************************************/
 334
 335 uint32 prs_data_size(prs_struct *ps)
 336 {
 337         return ps->buffer_size;
 338 }
 339
 340 /*******************************************************************
 341  Fetch the current offset (external interface).
 342  ********************************************************************/
 343
 344 uint32 prs_offset(prs_struct *ps)
 345 {
 346         return ps->data_offset;
 347 }
 348
 349 /*******************************************************************
 350  Set the current offset (external interface).
 351  ********************************************************************/
 352
 353 BOOL prs_set_offset(prs_struct *ps, uint32 offset)
 354 {
 355         if(offset <= ps->data_offset) {
 356                 ps->data_offset = offset;
 357                 return True;
 358         }
 359
 360         if(!prs_grow(ps, offset - ps->data_offset))
 361                 return False;
 362
 363         ps->data_offset = offset;
 364         return True;
 365 }
 366
 367 /*******************************************************************
 368  Append the data from one parse_struct into another.
 369  ********************************************************************/
 370
 371 BOOL prs_append_prs_data(prs_struct *dst, prs_struct *src)
 372 {
 373         if (prs_offset(src) == 0)
 374                 return True;
 375
 376         if(!prs_grow(dst, prs_offset(src)))
 377                 return False;
 378
 379         memcpy(&dst->data_p[dst->data_offset], src->data_p, (size_t)prs_offset(src));
 380         dst->data_offset += prs_offset(src);
 381
 382         return True;
 383 }
 384
 385 /*******************************************************************
 386  Append some data from one parse_struct into another.
 387  ********************************************************************/
 388
 389 BOOL prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, uint32 len)
 390 {
 391         if (len == 0)
 392                 return True;
 393
 394         if(!prs_grow(dst, len))
 395                 return False;
 396
 397         memcpy(&dst->data_p[dst->data_offset], src->data_p + start, (size_t)len);
 398         dst->data_offset += len;
 399
 400         return True;
 401 }
 402
 403 /*******************************************************************
 404  Append the data from a buffer into a parse_struct.
 405  ********************************************************************/
 406
 407 BOOL prs_copy_data_in(prs_struct *dst, const char *src, uint32 len)
 408 {
 409         if (len == 0)
 410                 return True;
 411
 412         if(!prs_grow(dst, len))
 413                 return False;
 414
 415         memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
 416         dst->data_offset += len;
 417
 418         return True;
 419 }
 420
 421 /*******************************************************************
 422  Copy some data from a parse_struct into a buffer.
 423  ********************************************************************/
 424
 425 BOOL prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
 426 {
 427         if (len == 0)
 428                 return True;
 429
 430         if(!prs_mem_get(src, len))
 431                 return False;
 432
 433         memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
 434         src->data_offset += len;
 435
 436         return True;
 437 }
 438
 439 /*******************************************************************
 440  Copy all the data from a parse_struct into a buffer.
 441  ********************************************************************/
 442
 443 BOOL prs_copy_all_data_out(char *dst, prs_struct *src)
 444 {
 445         uint32 len = prs_offset(src);
 446
 447         if (!len)
 448                 return True;
 449
 450         prs_set_offset(src, 0);
 451         return prs_copy_data_out(dst, src, len);
 452 }
 453
 454 /*******************************************************************
 455  Set the data as X-endian (external interface).
 456  ********************************************************************/
 457
 458 void prs_set_endian_data(prs_struct *ps, BOOL endian)
 459 {
 460         ps->bigendian_data = endian;
 461 }
 462
 463 /*******************************************************************
 464  Align a the data_len to a multiple of align bytes - filling with
 465  zeros.
 466  ********************************************************************/
 467
 468 BOOL prs_align(prs_struct *ps)
 469 {
 470         uint32 mod = ps->data_offset & (ps->align-1);
 471
 472         if (ps->align != 0 && mod != 0) {
 473                 uint32 extra_space = (ps->align - mod);
 474                 if(!prs_grow(ps, extra_space))
 475                         return False;
 476                 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
 477                 ps->data_offset += extra_space;
 478         }
 479
 480         return True;
 481 }
 482
 483 /******************************************************************
 484  Align on a 2 byte boundary
 485  *****************************************************************/
 486
 487 BOOL prs_align_uint16(prs_struct *ps)
 488 {
 489         BOOL ret;
 490         uint8 old_align = ps->align;
 491
 492         ps->align = 2;
 493         ret = prs_align(ps);
 494         ps->align = old_align;
 495
 496         return ret;
 497 }
 498
 499 /******************************************************************
 500  Align on a 8 byte boundary
 501  *****************************************************************/
 502
 503 BOOL prs_align_uint64(prs_struct *ps)
 504 {
 505         BOOL ret;
 506         uint8 old_align = ps->align;
 507
 508         ps->align = 8;
 509         ret = prs_align(ps);
 510         ps->align = old_align;
 511
 512         return ret;
 513 }
 514
 515 /******************************************************************
 516  Align on a specific byte boundary
 517  *****************************************************************/
 518
 519 BOOL prs_align_custom(prs_struct *ps, uint8 boundary)
 520 {
 521         BOOL ret;
 522         uint8 old_align = ps->align;
 523
 524         ps->align = boundary;
 525         ret = prs_align(ps);
 526         ps->align = old_align;
 527
 528         return ret;
 529 }
 530
 531
 532
 533 /*******************************************************************
 534  Align only if required (for the unistr2 string mainly)
 535  ********************************************************************/
 536
 537 BOOL prs_align_needed(prs_struct *ps, uint32 needed)
 538 {
 539         if (needed==0)
 540                 return True;
 541         else
 542                 return prs_align(ps);
 543 }
 544
 545 /*******************************************************************
 546  Ensure we can read/write to a given offset.
 547  ********************************************************************/
 548
 549 char *prs_mem_get(prs_struct *ps, uint32 extra_size)
 550 {
 551         if(UNMARSHALLING(ps)) {
 552                 /*
 553                  * If reading, ensure that we can read the requested size item.
 554                  */
 555                 if (ps->data_offset + extra_size > ps->buffer_size) {
 556                         DEBUG(0,("prs_mem_get: reading data of size %u would overrun "
 557                                 "buffer by %u bytes.\n",
 558                                 (unsigned int)extra_size,
 559                                 (unsigned int)(ps->data_offset + extra_size - ps->buffer_size) ));
 560                         return NULL;
 561                 }
 562         } else {
 563                 /*
 564                  * Writing - grow the buffer if needed.
 565                  */
 566                 if(!prs_grow(ps, extra_size))
 567                         return NULL;
 568         }
 569         return &ps->data_p[ps->data_offset];
 570 }
 571
 572 /*******************************************************************
 573  Change the struct type.
 574  ********************************************************************/
 575
 576 void prs_switch_type(prs_struct *ps, BOOL io)
 577 {
 578         if ((ps->io ^ io) == True)
 579                 ps->io=io;
 580 }
 581
 582 /*******************************************************************
 583  Force a prs_struct to be dynamic even when it's size is 0.
 584  ********************************************************************/
 585
 586 void prs_force_dynamic(prs_struct *ps)
 587 {
 588         ps->is_dynamic=True;
 589 }
 590
 591 /*******************************************************************
 592  Associate a session key with a parse struct.
 593  ********************************************************************/
 594
 595 void prs_set_session_key(prs_struct *ps, const char sess_key[16])
 596 {
 597         ps->sess_key = sess_key;
 598 }
 599
 600 /*******************************************************************
 601  Stream a uint8.
 602  ********************************************************************/
 603
 604 BOOL prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
 605 {
 606         char *q = prs_mem_get(ps, 1);
 607         if (q == NULL)
 608                 return False;
 609
 610         if (UNMARSHALLING(ps))
 611                 *data8 = CVAL(q,0);
 612         else
 613                 SCVAL(q,0,*data8);
 614
 615         DEBUG(5,("%s%04x %s: %02x\n", tab_depth(depth), ps->data_offset, name, *data8));
 616
 617         ps->data_offset += 1;
 618
 619         return True;
 620 }
 621
 622 /*******************************************************************
 623  Stream a uint16* (allocate memory if unmarshalling)
 624  ********************************************************************/
 625
 626 BOOL prs_pointer( const char *name, prs_struct *ps, int depth,
 627                  void *dta, size_t data_size,
 628                  BOOL(*prs_fn)(const char*, prs_struct*, int, void*) )
 629 {
 630         void ** data = (void **)dta;
 631         uint32 data_p;
 632
 633         /* output f000baaa to stream if the pointer is non-zero. */
 634
 635         data_p = *data ? 0xf000baaa : 0;
 636
 637         if ( !prs_uint32("ptr", ps, depth, &data_p ))
 638                 return False;
 639
 640         /* we're done if there is no data */
 641
 642         if ( !data_p )
 643                 return True;
 644
 645         if (UNMARSHALLING(ps)) {
 646                 if (data_size) {
 647                         if ( !(*data = PRS_ALLOC_MEM(ps, char, data_size)) )
 648                                 return False;
 649                 } else {
 650                         *data = NULL;
 651                 }
 652         }
 653
 654         return prs_fn(name, ps, depth, *data);
 655 }
 656
 657
 658 /*******************************************************************
 659  Stream a uint16.
 660  ********************************************************************/
 661
 662 BOOL prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
 663 {
 664         char *q = prs_mem_get(ps, sizeof(uint16));
 665         if (q == NULL)
 666                 return False;
 667
 668         if (UNMARSHALLING(ps)) {
 669                 if (ps->bigendian_data)
 670                         *data16 = RSVAL(q,0);
 671                 else
 672                         *data16 = SVAL(q,0);
 673         } else {
 674                 if (ps->bigendian_data)
 675                         RSSVAL(q,0,*data16);
 676                 else
 677                         SSVAL(q,0,*data16);
 678         }
 679
 680         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));
 681
 682         ps->data_offset += sizeof(uint16);
 683
 684         return True;
 685 }
 686
 687 /*******************************************************************
 688  Stream a uint32.
 689  ********************************************************************/
 690
 691 BOOL prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
 692 {
 693         char *q = prs_mem_get(ps, sizeof(uint32));
 694         if (q == NULL)
 695                 return False;
 696
 697         if (UNMARSHALLING(ps)) {
 698                 if (ps->bigendian_data)
 699                         *data32 = RIVAL(q,0);
 700                 else
 701                         *data32 = IVAL(q,0);
 702         } else {
 703                 if (ps->bigendian_data)
 704                         RSIVAL(q,0,*data32);
 705                 else
 706                         SIVAL(q,0,*data32);
 707         }
 708
 709         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 710
 711         ps->data_offset += sizeof(uint32);
 712
 713         return True;
 714 }
 715
 716 /*******************************************************************
 717  Stream an int32.
 718  ********************************************************************/
 719
 720 BOOL prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
 721 {
 722         char *q = prs_mem_get(ps, sizeof(int32));
 723         if (q == NULL)
 724                 return False;
 725
 726         if (UNMARSHALLING(ps)) {
 727                 if (ps->bigendian_data)
 728                         *data32 = RIVALS(q,0);
 729                 else
 730                         *data32 = IVALS(q,0);
 731         } else {
 732                 if (ps->bigendian_data)
 733                         RSIVALS(q,0,*data32);
 734                 else
 735                         SIVALS(q,0,*data32);
 736         }
 737
 738         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 739
 740         ps->data_offset += sizeof(int32);
 741
 742         return True;
 743 }
 744
 745 /*******************************************************************
 746  Stream a NTSTATUS
 747  ********************************************************************/
 748
 749 BOOL prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 750 {
 751         char *q = prs_mem_get(ps, sizeof(uint32));
 752         if (q == NULL)
 753                 return False;
 754
 755         if (UNMARSHALLING(ps)) {
 756                 if (ps->bigendian_data)
 757                         *status = NT_STATUS(RIVAL(q,0));
 758                 else
 759                         *status = NT_STATUS(IVAL(q,0));
 760         } else {
 761                 if (ps->bigendian_data)
 762                         RSIVAL(q,0,NT_STATUS_V(*status));
 763                 else
 764                         SIVAL(q,0,NT_STATUS_V(*status));
 765         }
 766
 767         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 768                  nt_errstr(*status)));
 769
 770         ps->data_offset += sizeof(uint32);
 771
 772         return True;
 773 }
 774
 775 /*******************************************************************
 776  Stream a DCE error code
 777  ********************************************************************/
 778
 779 BOOL prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 780 {
 781         char *q = prs_mem_get(ps, sizeof(uint32));
 782         if (q == NULL)
 783                 return False;
 784
 785         if (UNMARSHALLING(ps)) {
 786                 if (ps->bigendian_data)
 787                         *status = NT_STATUS(RIVAL(q,0));
 788                 else
 789                         *status = NT_STATUS(IVAL(q,0));
 790         } else {
 791                 if (ps->bigendian_data)
 792                         RSIVAL(q,0,NT_STATUS_V(*status));
 793                 else
 794                         SIVAL(q,0,NT_STATUS_V(*status));
 795         }
 796
 797         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 798                  dcerpc_errstr(NT_STATUS_V(*status))));
 799
 800         ps->data_offset += sizeof(uint32);
 801
 802         return True;
 803 }
 804
 805
 806 /*******************************************************************
 807  Stream a WERROR
 808  ********************************************************************/
 809
 810 BOOL prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 811 {
 812         char *q = prs_mem_get(ps, sizeof(uint32));
 813         if (q == NULL)
 814                 return False;
 815
 816         if (UNMARSHALLING(ps)) {
 817                 if (ps->bigendian_data)
 818                         *status = W_ERROR(RIVAL(q,0));
 819                 else
 820                         *status = W_ERROR(IVAL(q,0));
 821         } else {
 822                 if (ps->bigendian_data)
 823                         RSIVAL(q,0,W_ERROR_V(*status));
 824                 else
 825                         SIVAL(q,0,W_ERROR_V(*status));
 826         }
 827
 828         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 829                  dos_errstr(*status)));
 830
 831         ps->data_offset += sizeof(uint32);
 832
 833         return True;
 834 }
 835
 836
 837 /******************************************************************
 838  Stream an array of uint8s. Length is number of uint8s.
 839  ********************************************************************/
 840
 841 BOOL prs_uint8s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 842 {
 843         int i;
 844         char *q = prs_mem_get(ps, len);
 845         if (q == NULL)
 846                 return False;
 847
 848         if (UNMARSHALLING(ps)) {
 849                 for (i = 0; i < len; i++)
 850                         data8s[i] = CVAL(q,i);
 851         } else {
 852                 for (i = 0; i < len; i++)
 853                         SCVAL(q, i, data8s[i]);
 854         }
 855
 856         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
 857         if (charmode)
 858                 print_asc(5, (unsigned char*)data8s, len);
 859         else {
 860                 for (i = 0; i < len; i++)
 861                         DEBUG(5,("%02x ", data8s[i]));
 862         }
 863         DEBUG(5,("\n"));
 864
 865         ps->data_offset += len;
 866
 867         return True;
 868 }
 869
 870 /******************************************************************
 871  Stream an array of uint16s. Length is number of uint16s.
 872  ********************************************************************/
 873
 874 BOOL prs_uint16s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 875 {
 876         int i;
 877         char *q = prs_mem_get(ps, len * sizeof(uint16));
 878         if (q == NULL)
 879                 return False;
 880
 881         if (UNMARSHALLING(ps)) {
 882                 if (ps->bigendian_data) {
 883                         for (i = 0; i < len; i++)
 884                                 data16s[i] = RSVAL(q, 2*i);
 885                 } else {
 886                         for (i = 0; i < len; i++)
 887                                 data16s[i] = SVAL(q, 2*i);
 888                 }
 889         } else {
 890                 if (ps->bigendian_data) {
 891                         for (i = 0; i < len; i++)
 892                                 RSSVAL(q, 2*i, data16s[i]);
 893                 } else {
 894                         for (i = 0; i < len; i++)
 895                                 SSVAL(q, 2*i, data16s[i]);
 896                 }
 897         }
 898
 899         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 900         if (charmode)
 901                 print_asc(5, (unsigned char*)data16s, 2*len);
 902         else {
 903                 for (i = 0; i < len; i++)
 904                         DEBUG(5,("%04x ", data16s[i]));
 905         }
 906         DEBUG(5,("\n"));
 907
 908         ps->data_offset += (len * sizeof(uint16));
 909
 910         return True;
 911 }
 912
 913 /******************************************************************
 914  Start using a function for streaming unicode chars. If unmarshalling,
 915  output must be little-endian, if marshalling, input must be little-endian.
 916  ********************************************************************/
 917
 918 static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
 919                                                         char *in_buf, char *out_buf, int len)
 920 {
 921         int i;
 922
 923         if (UNMARSHALLING(ps)) {
 924                 if (ps->bigendian_data) {
 925                         for (i = 0; i < len; i++)
 926                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 927                 } else {
 928                         for (i = 0; i < len; i++)
 929                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 930                 }
 931         } else {
 932                 if (ps->bigendian_data) {
 933                         for (i = 0; i < len; i++)
 934                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 935                 } else {
 936                         for (i = 0; i < len; i++)
 937                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 938                 }
 939         }
 940
 941         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 942         if (charmode)
 943                 print_asc(5, (unsigned char*)out_buf, 2*len);
 944         else {
 945                 for (i = 0; i < len; i++)
 946                         DEBUG(5,("%04x ", out_buf[i]));
 947         }
 948         DEBUG(5,("\n"));
 949 }
 950
 951 /******************************************************************
 952  Stream a unistr. Always little endian.
 953  ********************************************************************/
 954
 955 BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 956 {
 957         char *q = prs_mem_get(ps, len * sizeof(uint16));
 958         if (q == NULL)
 959                 return False;
 960
 961         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 962         ps->data_offset += (len * sizeof(uint16));
 963
 964         return True;
 965 }
 966
 967 /******************************************************************
 968  Stream an array of uint32s. Length is number of uint32s.
 969  ********************************************************************/
 970
 971 BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 972 {
 973         int i;
 974         char *q = prs_mem_get(ps, len * sizeof(uint32));
 975         if (q == NULL)
 976                 return False;
 977
 978         if (UNMARSHALLING(ps)) {
 979                 if (ps->bigendian_data) {
 980                         for (i = 0; i < len; i++)
 981                                 data32s[i] = RIVAL(q, 4*i);
 982                 } else {
 983                         for (i = 0; i < len; i++)
 984                                 data32s[i] = IVAL(q, 4*i);
 985                 }
 986         } else {
 987                 if (ps->bigendian_data) {
 988                         for (i = 0; i < len; i++)
 989                                 RSIVAL(q, 4*i, data32s[i]);
 990                 } else {
 991                         for (i = 0; i < len; i++)
 992                                 SIVAL(q, 4*i, data32s[i]);
 993                 }
 994         }
 995
 996         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 997         if (charmode)
 998                 print_asc(5, (unsigned char*)data32s, 4*len);
 999         else {
1000                 for (i = 0; i < len; i++)
1001                         DEBUG(5,("%08x ", data32s[i]));
1002         }
1003         DEBUG(5,("\n"));
1004
1005         ps->data_offset += (len * sizeof(uint32));
1006
1007         return True;
1008 }
1009
1010 /******************************************************************
1011  Stream an array of unicode string, length/buffer specified separately,
1012  in uint16 chars. The unicode string is already in little-endian format.
1013  ********************************************************************/
1014
1015 BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
1016 {
1017         char *p;
1018         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
1019         if (q == NULL)
1020                 return False;
1021
1022         /* If the string is empty, we don't have anything to stream */
1023         if (str->buf_len==0)
1024                 return True;
1025
1026         if (UNMARSHALLING(ps)) {
1027                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
1028                 if (str->buffer == NULL)
1029                         return False;
1030         }
1031
1032         p = (char *)str->buffer;
1033
1034         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
1035
1036         ps->data_offset += (str->buf_len * sizeof(uint16));
1037
1038         return True;
1039 }
1040
1041 /******************************************************************
1042  Stream a "not" unicode string, length/buffer specified separately,
1043  in byte chars. String is in little-endian format.
1044  ********************************************************************/
1045
1046 BOOL prs_regval_buffer(BOOL charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
1047 {
1048         char *p;
1049         char *q = prs_mem_get(ps, buf->buf_len);
1050         if (q == NULL)
1051                 return False;
1052
1053         if (UNMARSHALLING(ps)) {
1054                 if (buf->buf_len > buf->buf_max_len) {
1055                         return False;
1056                 }
1057                 if ( buf->buf_max_len ) {
1058                         buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
1059                         if ( buf->buffer == NULL )
1060                                 return False;
1061                 } else {
1062                         buf->buffer = NULL;
1063                 }
1064         }
1065
1066         p = (char *)buf->buffer;
1067
1068         dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
1069         ps->data_offset += buf->buf_len;
1070
1071         return True;
1072 }
1073
1074 /******************************************************************
1075  Stream a string, length/buffer specified separately,
1076  in uint8 chars.
1077  ********************************************************************/
1078
1079 BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
1080 {
1081         unsigned int i;
1082         char *q = prs_mem_get(ps, str->str_str_len);
1083         if (q == NULL)
1084                 return False;
1085
1086         if (UNMARSHALLING(ps)) {
1087                 if (str->str_str_len > str->str_max_len) {
1088                         return False;
1089                 }
1090                 if (str->str_max_len) {
1091                         str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
1092                         if (str->buffer == NULL)
1093                                 return False;
1094                 } else {
1095                         str->buffer = NULL;
1096                         /* Return early to ensure Coverity isn't confused. */
1097                         DEBUG(5,("%s%04x %s: \n", tab_depth(depth), ps->data_offset, name));
1098                         return True;
1099                 }
1100         }
1101
1102         if (UNMARSHALLING(ps)) {
1103                 for (i = 0; i < str->str_str_len; i++)
1104                         str->buffer[i] = CVAL(q,i);
1105         } else {
1106                 for (i = 0; i < str->str_str_len; i++)
1107                         SCVAL(q, i, str->buffer[i]);
1108         }
1109
1110         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1111         if (charmode)
1112                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
1113         else {
1114                 for (i = 0; i < str->str_str_len; i++)
1115                         DEBUG(5,("%02x ", str->buffer[i]));
1116         }
1117         DEBUG(5,("\n"));
1118
1119         ps->data_offset += str->str_str_len;
1120
1121         return True;
1122 }
1123
1124 /******************************************************************
1125  Stream a unicode string, length/buffer specified separately,
1126  in uint16 chars. The unicode string is already in little-endian format.
1127  ********************************************************************/
1128
1129 BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1130 {
1131         char *p;
1132         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1133         if (q == NULL)
1134                 return False;
1135
1136         /* If the string is empty, we don't have anything to stream */
1137         if (str->uni_str_len==0)
1138                 return True;
1139
1140         if (UNMARSHALLING(ps)) {
1141                 if (str->uni_str_len > str->uni_max_len) {
1142                         return False;
1143                 }
1144                 if (str->uni_max_len) {
1145                         str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1146                         if (str->buffer == NULL)
1147                                 return False;
1148                 } else {
1149                         str->buffer = NULL;
1150                 }
1151         }
1152
1153         p = (char *)str->buffer;
1154
1155         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1156
1157         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1158
1159         return True;
1160 }
1161
1162 /******************************************************************
1163  Stream a unicode string, length/buffer specified separately,
1164  in uint16 chars. The unicode string is already in little-endian format.
1165  ********************************************************************/
1166
1167 BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1168 {
1169         char *p;
1170         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1171         if (q == NULL)
1172                 return False;
1173
1174         if (UNMARSHALLING(ps)) {
1175                 if (str->uni_str_len) {
1176                         str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1177                         if (str->str.buffer == NULL)
1178                                 return False;
1179                 } else {
1180                         str->str.buffer = NULL;
1181                 }
1182         }
1183
1184         p = (char *)str->str.buffer;
1185
1186         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1187         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1188
1189         return True;
1190 }
1191
1192 /*******************************************************************
1193  Stream a unicode  null-terminated string. As the string is already
1194  in little-endian format then do it as a stream of bytes.
1195  ********************************************************************/
1196
1197 BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1198 {
1199         unsigned int len = 0;
1200         unsigned char *p = (unsigned char *)str->buffer;
1201         uint8 *start;
1202         char *q;
1203         uint32 max_len;
1204         uint16* ptr;
1205
1206         if (MARSHALLING(ps)) {
1207
1208                 for(len = 0; str->buffer[len] != 0; len++)
1209                         ;
1210
1211                 q = prs_mem_get(ps, (len+1)*2);
1212                 if (q == NULL)
1213                         return False;
1214
1215                 start = (uint8*)q;
1216
1217                 for(len = 0; str->buffer[len] != 0; len++) {
1218                         if(ps->bigendian_data) {
1219                                 /* swap bytes - p is little endian, q is big endian. */
1220                                 q[0] = (char)p[1];
1221                                 q[1] = (char)p[0];
1222                                 p += 2;
1223                                 q += 2;
1224                         }
1225                         else
1226                         {
1227                                 q[0] = (char)p[0];
1228                                 q[1] = (char)p[1];
1229                                 p += 2;
1230                                 q += 2;
1231                         }
1232                 }
1233
1234                 /*
1235                  * even if the string is 'empty' (only an \0 char)
1236                  * at this point the leading \0 hasn't been parsed.
1237                  * so parse it now
1238                  */
1239
1240                 q[0] = 0;
1241                 q[1] = 0;
1242                 q += 2;
1243
1244                 len++;
1245
1246                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1247                 print_asc(5, (unsigned char*)start, 2*len);
1248                 DEBUG(5, ("\n"));
1249         }
1250         else { /* unmarshalling */
1251
1252                 uint32 alloc_len = 0;
1253                 q = ps->data_p + prs_offset(ps);
1254
1255                 /*
1256                  * Work out how much space we need and talloc it.
1257                  */
1258                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1259
1260                 /* the test of the value of *ptr helps to catch the circumstance
1261                    where we have an emtpty (non-existent) string in the buffer */
1262                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1263                         /* do nothing */
1264                         ;
1265
1266                 if (alloc_len < max_len)
1267                         alloc_len += 1;
1268
1269                 /* should we allocate anything at all? */
1270                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1271                 if ((str->buffer == NULL) && (alloc_len > 0))
1272                         return False;
1273
1274                 p = (unsigned char *)str->buffer;
1275
1276                 len = 0;
1277                 /* the (len < alloc_len) test is to prevent us from overwriting
1278                    memory that is not ours...if we get that far, we have a non-null
1279                    terminated string in the buffer and have messed up somewhere */
1280                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1281                         if(ps->bigendian_data)
1282                         {
1283                                 /* swap bytes - q is big endian, p is little endian. */
1284                                 p[0] = (unsigned char)q[1];
1285                                 p[1] = (unsigned char)q[0];
1286                                 p += 2;
1287                                 q += 2;
1288                         } else {
1289
1290                                 p[0] = (unsigned char)q[0];
1291                                 p[1] = (unsigned char)q[1];
1292                                 p += 2;
1293                                 q += 2;
1294                         }
1295
1296                         len++;
1297                 }
1298                 if (len < alloc_len) {
1299                         /* NULL terminate the UNISTR */
1300                         str->buffer[len++] = '\0';
1301                 }
1302
1303                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1304                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1305                 DEBUG(5, ("\n"));
1306         }
1307
1308         /* set the offset in the prs_struct; 'len' points to the
1309            terminiating NULL in the UNISTR so we need to go one more
1310            uint16 */
1311         ps->data_offset += (len)*2;
1312
1313         return True;
1314 }
1315
1316
1317 /*******************************************************************
1318  Stream a null-terminated string.  len is strlen, and therefore does
1319  not include the null-termination character.
1320  ********************************************************************/
1321
1322 BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1323 {
1324         char *q;
1325         int i;
1326         int len;
1327
1328         if (UNMARSHALLING(ps))
1329                 len = strlen(&ps->data_p[ps->data_offset]);
1330         else
1331                 len = strlen(str);
1332
1333         len = MIN(len, (max_buf_size-1));
1334
1335         q = prs_mem_get(ps, len+1);
1336         if (q == NULL)
1337                 return False;
1338
1339         for(i = 0; i < len; i++) {
1340                 if (UNMARSHALLING(ps))
1341                         str[i] = q[i];
1342                 else
1343                         q[i] = str[i];
1344         }
1345
1346         /* The terminating null. */
1347         str[i] = '\0';
1348
1349         if (MARSHALLING(ps)) {
1350                 q[i] = '\0';
1351         }
1352
1353         ps->data_offset += len+1;
1354
1355         dump_data(5+depth, (uint8 *)q, len);
1356
1357         return True;
1358 }
1359
1360 BOOL prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str)
1361 {
1362         size_t len;
1363         char *tmp_str;
1364
1365         if (UNMARSHALLING(ps)) {
1366                 len = strlen(&ps->data_p[ps->data_offset]);
1367         } else {
1368                 len = strlen(*str);
1369         }
1370
1371         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1372
1373         if (tmp_str == NULL) {
1374                 return False;
1375         }
1376
1377         if (MARSHALLING(ps)) {
1378                 strncpy(tmp_str, *str, len);
1379         }
1380
1381         if (!prs_string(name, ps, depth, tmp_str, len+1)) {
1382                 return False;
1383         }
1384
1385         *str = tmp_str;
1386         return True;
1387 }
1388
1389 /*******************************************************************
1390  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1391  uint16 should be stored, or gets the size if reading.
1392  ********************************************************************/
1393
1394 BOOL prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1395 {
1396         *offset = ps->data_offset;
1397         if (UNMARSHALLING(ps)) {
1398                 /* reading. */
1399                 return prs_uint16(name, ps, depth, data16);
1400         } else {
1401                 char *q = prs_mem_get(ps, sizeof(uint16));
1402                 if(q ==NULL)
1403                         return False;
1404                 ps->data_offset += sizeof(uint16);
1405         }
1406         return True;
1407 }
1408
1409 /*******************************************************************
1410  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1411  does nothing on reading, as that is already handled by ...._pre()
1412  ********************************************************************/
1413
1414 BOOL prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1415                                 uint32 ptr_uint16, uint32 start_offset)
1416 {
1417         if (MARSHALLING(ps)) {
1418                 /*
1419                  * Writing - temporarily move the offset pointer.
1420                  */
1421                 uint16 data_size = ps->data_offset - start_offset;
1422                 uint32 old_offset = ps->data_offset;
1423
1424                 ps->data_offset = ptr_uint16;
1425                 if(!prs_uint16(name, ps, depth, &data_size)) {
1426                         ps->data_offset = old_offset;
1427                         return False;
1428                 }
1429                 ps->data_offset = old_offset;
1430         } else {
1431                 ps->data_offset = start_offset + (uint32)(*data16);
1432         }
1433         return True;
1434 }
1435
1436 /*******************************************************************
1437  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1438  uint32 should be stored, or gets the size if reading.
1439  ********************************************************************/
1440
1441 BOOL prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1442 {
1443         *offset = ps->data_offset;
1444         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1445                 /* reading. */
1446                 return prs_uint32(name, ps, depth, data32);
1447         } else {
1448                 ps->data_offset += sizeof(uint32);
1449         }
1450         return True;
1451 }
1452
1453 /*******************************************************************
1454  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1455  does nothing on reading, as that is already handled by ...._pre()
1456  ********************************************************************/
1457
1458 BOOL prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1459                                 uint32 ptr_uint32, uint32 data_size)
1460 {
1461         if (MARSHALLING(ps)) {
1462                 /*
1463                  * Writing - temporarily move the offset pointer.
1464                  */
1465                 uint32 old_offset = ps->data_offset;
1466                 ps->data_offset = ptr_uint32;
1467                 if(!prs_uint32(name, ps, depth, &data_size)) {
1468                         ps->data_offset = old_offset;
1469                         return False;
1470                 }
1471                 ps->data_offset = old_offset;
1472         }
1473         return True;
1474 }
1475
1476 /* useful function to store a structure in rpc wire format */
1477 int tdb_prs_store(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps)
1478 {
1479         TDB_DATA dbuf;
1480         dbuf.dptr = (uint8 *)ps->data_p;
1481         dbuf.dsize = prs_offset(ps);
1482         return tdb_trans_store(tdb, kbuf, dbuf, TDB_REPLACE);
1483 }
1484
1485 int tdb_prs_store_bystring(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
1486 {
1487         TDB_DATA kbuf = string_term_tdb_data(keystr);
1488         return tdb_prs_store(tdb, kbuf, ps);
1489 }
1490
1491 /* useful function to fetch a structure into rpc wire format */
1492 int tdb_prs_fetch(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps, TALLOC_CTX *mem_ctx)
1493 {
1494         TDB_DATA dbuf;
1495
1496         prs_init(ps, 0, mem_ctx, UNMARSHALL);
1497
1498         dbuf = tdb_fetch(tdb, kbuf);
1499         if (!dbuf.dptr)
1500                 return -1;
1501
1502         prs_give_memory(ps, (char *)dbuf.dptr, dbuf.dsize, True);
1503
1504         return 0;
1505 }
1506
1507 int tdb_prs_fetch_bystring(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
1508 {
1509         TDB_DATA kbuf = string_term_tdb_data(keystr);
1510         return tdb_prs_fetch(tdb, kbuf, ps, mem_ctx);
1511 }
1512
1513 /*******************************************************************
1514  hash a stream.
1515  ********************************************************************/
1516
1517 BOOL prs_hash1(prs_struct *ps, uint32 offset, int len)
1518 {
1519         char *q;
1520
1521         q = ps->data_p;
1522         q = &q[offset];
1523
1524 #ifdef DEBUG_PASSWORD
1525         DEBUG(100, ("prs_hash1\n"));
1526         dump_data(100, (uint8 *)ps->sess_key, 16);
1527         dump_data(100, (uint8 *)q, len);
1528 #endif
1529         SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len);
1530
1531 #ifdef DEBUG_PASSWORD
1532         dump_data(100, (uint8 *)q, len);
1533 #endif
1534
1535         return True;
1536 }
1537
1538 /*******************************************************************
1539  Create a digest over the entire packet (including the data), and
1540  MD5 it with the session key.
1541  ********************************************************************/
1542
1543 static void schannel_digest(struct schannel_auth_struct *a,
1544                           enum pipe_auth_level auth_level,
1545                           RPC_AUTH_SCHANNEL_CHK * verf,
1546                           char *data, size_t data_len,
1547                           uchar digest_final[16])
1548 {
1549         uchar whole_packet_digest[16];
1550         static uchar zeros[4];
1551         struct MD5Context ctx3;
1552
1553         /* verfiy the signature on the packet by MD5 over various bits */
1554         MD5Init(&ctx3);
1555         /* use our sequence number, which ensures the packet is not
1556            out of order */
1557         MD5Update(&ctx3, zeros, sizeof(zeros));
1558         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1559         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1560                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1561         }
1562         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1563         MD5Final(whole_packet_digest, &ctx3);
1564         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1565
1566         /* MD5 this result and the session key, to prove that
1567            only a valid client could had produced this */
1568         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1569 }
1570
1571 /*******************************************************************
1572  Calculate the key with which to encode the data payload
1573  ********************************************************************/
1574
1575 static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1576                                    RPC_AUTH_SCHANNEL_CHK *verf,
1577                                    uchar sealing_key[16])
1578 {
1579         static uchar zeros[4];
1580         uchar digest2[16];
1581         uchar sess_kf0[16];
1582         int i;
1583
1584         for (i = 0; i < sizeof(sess_kf0); i++) {
1585                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1586         }
1587
1588         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1589
1590         /* MD5 of sess_kf0 and 4 zero bytes */
1591         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1592         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1593
1594         /* MD5 of the above result, plus 8 bytes of sequence number */
1595         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1596         dump_data_pw("sealing_key:\n", sealing_key, 16);
1597 }
1598
1599 /*******************************************************************
1600  Encode or Decode the sequence number (which is symmetric)
1601  ********************************************************************/
1602
1603 static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1604                                      RPC_AUTH_SCHANNEL_CHK *verf)
1605 {
1606         static uchar zeros[4];
1607         uchar sequence_key[16];
1608         uchar digest1[16];
1609
1610         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1611         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1612
1613         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1614
1615         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1616
1617         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1618         SamOEMhash(verf->seq_num, sequence_key, 8);
1619         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1620 }
1621
1622 /*******************************************************************
1623 creates an RPC_AUTH_SCHANNEL_CHK structure.
1624 ********************************************************************/
1625
1626 static BOOL init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1627                               const uchar sig[8],
1628                               const uchar packet_digest[8],
1629                               const uchar seq_num[8], const uchar confounder[8])
1630 {
1631         if (chk == NULL)
1632                 return False;
1633
1634         memcpy(chk->sig, sig, sizeof(chk->sig));
1635         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1636         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1637         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1638
1639         return True;
1640 }
1641
1642 /*******************************************************************
1643  Encode a blob of data using the schannel alogrithm, also produceing
1644  a checksum over the original data.  We currently only support
1645  signing and sealing togeather - the signing-only code is close, but not
1646  quite compatible with what MS does.
1647  ********************************************************************/
1648
1649 void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1650                    enum schannel_direction direction,
1651                    RPC_AUTH_SCHANNEL_CHK * verf,
1652                    char *data, size_t data_len)
1653 {
1654         uchar digest_final[16];
1655         uchar confounder[8];
1656         uchar seq_num[8];
1657         static const uchar nullbytes[8] = { 0, };
1658
1659         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1660         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1661         const uchar *schannel_sig = NULL;
1662
1663         DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1664
1665         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1666                 schannel_sig = schannel_seal_sig;
1667         } else {
1668                 schannel_sig = schannel_sign_sig;
1669         }
1670
1671         /* fill the 'confounder' with random data */
1672         generate_random_buffer(confounder, sizeof(confounder));
1673
1674         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1675
1676         RSIVAL(seq_num, 0, a->seq_num);
1677
1678         switch (direction) {
1679         case SENDER_IS_INITIATOR:
1680                 SIVAL(seq_num, 4, 0x80);
1681                 break;
1682         case SENDER_IS_ACCEPTOR:
1683                 SIVAL(seq_num, 4, 0x0);
1684                 break;
1685         }
1686
1687         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1688
1689         init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1690                                  seq_num, confounder);
1691
1692         /* produce a digest of the packet to prove it's legit (before we seal it) */
1693         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1694         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1695
1696         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1697                 uchar sealing_key[16];
1698
1699                 /* get the key to encode the data with */
1700                 schannel_get_sealing_key(a, verf, sealing_key);
1701
1702                 /* encode the verification data */
1703                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1704                 SamOEMhash(verf->confounder, sealing_key, 8);
1705
1706                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1707
1708                 /* encode the packet payload */
1709                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1710                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1711                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1712         }
1713
1714         /* encode the sequence number (key based on packet digest) */
1715         /* needs to be done after the sealing, as the original version
1716            is used in the sealing stuff... */
1717         schannel_deal_with_seq_num(a, verf);
1718
1719         return;
1720 }
1721
1722 /*******************************************************************
1723  Decode a blob of data using the schannel alogrithm, also verifiying
1724  a checksum over the original data.  We currently can verify signed messages,
1725  as well as decode sealed messages
1726  ********************************************************************/
1727
1728 BOOL schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1729                    enum schannel_direction direction,
1730                    RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1731 {
1732         uchar digest_final[16];
1733
1734         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1735         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1736         const uchar *schannel_sig = NULL;
1737
1738         uchar seq_num[8];
1739
1740         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1741
1742         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1743                 schannel_sig = schannel_seal_sig;
1744         } else {
1745                 schannel_sig = schannel_sign_sig;
1746         }
1747
1748         /* Create the expected sequence number for comparison */
1749         RSIVAL(seq_num, 0, a->seq_num);
1750
1751         switch (direction) {
1752         case SENDER_IS_INITIATOR:
1753                 SIVAL(seq_num, 4, 0x80);
1754                 break;
1755         case SENDER_IS_ACCEPTOR:
1756                 SIVAL(seq_num, 4, 0x0);
1757                 break;
1758         }
1759
1760         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1761         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1762
1763         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1764
1765         /* extract the sequence number (key based on supplied packet digest) */
1766         /* needs to be done before the sealing, as the original version
1767            is used in the sealing stuff... */
1768         schannel_deal_with_seq_num(a, verf);
1769
1770         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1771                 /* don't even bother with the below if the sequence number is out */
1772                 /* The sequence number is MD5'ed with a key based on the whole-packet
1773                    digest, as supplied by the client.  We check that it's a valid
1774                    checksum after the decode, below
1775                 */
1776                 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1777                 dump_data(2, (const uint8 *)verf->seq_num, sizeof(verf->seq_num));
1778                 DEBUG(2, ("should be:\n"));
1779                 dump_data(2, (const uint8 *)seq_num, sizeof(seq_num));
1780
1781                 return False;
1782         }
1783
1784         if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1785                 /* Validate that the other end sent the expected header */
1786                 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1787                 dump_data(2, (const uint8 *)verf->sig, sizeof(verf->sig));
1788                 DEBUG(2, ("should be:\n"));
1789                 dump_data(2, (const uint8 *)schannel_sig, sizeof(schannel_sig));
1790                 return False;
1791         }
1792
1793         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1794                 uchar sealing_key[16];
1795
1796                 /* get the key to extract the data with */
1797                 schannel_get_sealing_key(a, verf, sealing_key);
1798
1799                 /* extract the verification data */
1800                 dump_data_pw("verf->confounder:\n", verf->confounder,
1801                              sizeof(verf->confounder));
1802                 SamOEMhash(verf->confounder, sealing_key, 8);
1803
1804                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1805                              sizeof(verf->confounder));
1806
1807                 /* extract the packet payload */
1808                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1809                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1810                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1811         }
1812
1813         /* digest includes 'data' after unsealing */
1814         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1815
1816         dump_data_pw("Calculated digest:\n", digest_final,
1817                      sizeof(digest_final));
1818         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1819                      sizeof(verf->packet_digest));
1820
1821         /* compare - if the client got the same result as us, then
1822            it must know the session key */
1823         return (memcmp(digest_final, verf->packet_digest,
1824                        sizeof(verf->packet_digest)) == 0);
1825 }
1826
1827 /*******************************************************************
1828 creates a new prs_struct containing a DATA_BLOB
1829 ********************************************************************/
1830 BOOL prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1831 {
1832         if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL ))
1833                 return False;
1834
1835
1836         if (!prs_copy_data_in(prs, (char *)blob->data, blob->length))
1837                 return False;
1838
1839         return True;
1840 }
1841
1842 /*******************************************************************
1843 return the contents of a prs_struct in a DATA_BLOB
1844 ********************************************************************/
1845 BOOL prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1846 {
1847         blob->length = prs_data_size(prs);
1848         blob->data = (uint8 *)TALLOC_ZERO_SIZE(mem_ctx, blob->length);
1849
1850         /* set the pointer at the end of the buffer */
1851         prs_set_offset( prs, prs_data_size(prs) );
1852
1853         if (!prs_copy_all_data_out((char *)blob->data, prs))
1854                 return False;
1855
1856         return True;
1857 }