source3/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                 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 = 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 = 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 = 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 = 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 **data, size_t data_size,
 628                  BOOL(*prs_fn)(const char*, prs_struct*, int, void*) )
 629 {
 630         uint32 data_p;
 631
 632         /* output f000baaa to stream if the pointer is non-zero. */
 633
 634         data_p = *data ? 0xf000baaa : 0;
 635
 636         if ( !prs_uint32("ptr", ps, depth, &data_p ))
 637                 return False;
 638
 639         /* we're done if there is no data */
 640
 641         if ( !data_p )
 642                 return True;
 643
 644         if (UNMARSHALLING(ps)) {
 645                 if ( !(*data = PRS_ALLOC_MEM_VOID(ps, data_size)) )
 646                         return False;
 647         }
 648
 649         return prs_fn(name, ps, depth, *data);
 650 }
 651
 652
 653 /*******************************************************************
 654  Stream a uint16.
 655  ********************************************************************/
 656
 657 BOOL prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
 658 {
 659         char *q = prs_mem_get(ps, sizeof(uint16));
 660         if (q == NULL)
 661                 return False;
 662
 663         if (UNMARSHALLING(ps)) {
 664                 if (ps->bigendian_data)
 665                         *data16 = RSVAL(q,0);
 666                 else
 667                         *data16 = SVAL(q,0);
 668         } else {
 669                 if (ps->bigendian_data)
 670                         RSSVAL(q,0,*data16);
 671                 else
 672                         SSVAL(q,0,*data16);
 673         }
 674
 675         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));
 676
 677         ps->data_offset += sizeof(uint16);
 678
 679         return True;
 680 }
 681
 682 /*******************************************************************
 683  Stream a uint32.
 684  ********************************************************************/
 685
 686 BOOL prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
 687 {
 688         char *q = prs_mem_get(ps, sizeof(uint32));
 689         if (q == NULL)
 690                 return False;
 691
 692         if (UNMARSHALLING(ps)) {
 693                 if (ps->bigendian_data)
 694                         *data32 = RIVAL(q,0);
 695                 else
 696                         *data32 = IVAL(q,0);
 697         } else {
 698                 if (ps->bigendian_data)
 699                         RSIVAL(q,0,*data32);
 700                 else
 701                         SIVAL(q,0,*data32);
 702         }
 703
 704         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 705
 706         ps->data_offset += sizeof(uint32);
 707
 708         return True;
 709 }
 710
 711 /*******************************************************************
 712  Stream an int32.
 713  ********************************************************************/
 714
 715 BOOL prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
 716 {
 717         char *q = prs_mem_get(ps, sizeof(int32));
 718         if (q == NULL)
 719                 return False;
 720
 721         if (UNMARSHALLING(ps)) {
 722                 if (ps->bigendian_data)
 723                         *data32 = RIVALS(q,0);
 724                 else
 725                         *data32 = IVALS(q,0);
 726         } else {
 727                 if (ps->bigendian_data)
 728                         RSIVALS(q,0,*data32);
 729                 else
 730                         SIVALS(q,0,*data32);
 731         }
 732
 733         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 734
 735         ps->data_offset += sizeof(int32);
 736
 737         return True;
 738 }
 739
 740 /*******************************************************************
 741  Stream a NTSTATUS
 742  ********************************************************************/
 743
 744 BOOL prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 745 {
 746         char *q = prs_mem_get(ps, sizeof(uint32));
 747         if (q == NULL)
 748                 return False;
 749
 750         if (UNMARSHALLING(ps)) {
 751                 if (ps->bigendian_data)
 752                         *status = NT_STATUS(RIVAL(q,0));
 753                 else
 754                         *status = NT_STATUS(IVAL(q,0));
 755         } else {
 756                 if (ps->bigendian_data)
 757                         RSIVAL(q,0,NT_STATUS_V(*status));
 758                 else
 759                         SIVAL(q,0,NT_STATUS_V(*status));
 760         }
 761
 762         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 763                  nt_errstr(*status)));
 764
 765         ps->data_offset += sizeof(uint32);
 766
 767         return True;
 768 }
 769
 770 /*******************************************************************
 771  Stream a DCE error code
 772  ********************************************************************/
 773
 774 BOOL prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 775 {
 776         char *q = prs_mem_get(ps, sizeof(uint32));
 777         if (q == NULL)
 778                 return False;
 779
 780         if (UNMARSHALLING(ps)) {
 781                 if (ps->bigendian_data)
 782                         *status = NT_STATUS(RIVAL(q,0));
 783                 else
 784                         *status = NT_STATUS(IVAL(q,0));
 785         } else {
 786                 if (ps->bigendian_data)
 787                         RSIVAL(q,0,NT_STATUS_V(*status));
 788                 else
 789                         SIVAL(q,0,NT_STATUS_V(*status));
 790         }
 791
 792         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 793                  dcerpc_errstr(NT_STATUS_V(*status))));
 794
 795         ps->data_offset += sizeof(uint32);
 796
 797         return True;
 798 }
 799
 800
 801 /*******************************************************************
 802  Stream a WERROR
 803  ********************************************************************/
 804
 805 BOOL prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 806 {
 807         char *q = prs_mem_get(ps, sizeof(uint32));
 808         if (q == NULL)
 809                 return False;
 810
 811         if (UNMARSHALLING(ps)) {
 812                 if (ps->bigendian_data)
 813                         *status = W_ERROR(RIVAL(q,0));
 814                 else
 815                         *status = W_ERROR(IVAL(q,0));
 816         } else {
 817                 if (ps->bigendian_data)
 818                         RSIVAL(q,0,W_ERROR_V(*status));
 819                 else
 820                         SIVAL(q,0,W_ERROR_V(*status));
 821         }
 822
 823         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 824                  dos_errstr(*status)));
 825
 826         ps->data_offset += sizeof(uint32);
 827
 828         return True;
 829 }
 830
 831
 832 /******************************************************************
 833  Stream an array of uint8s. Length is number of uint8s.
 834  ********************************************************************/
 835
 836 BOOL prs_uint8s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 837 {
 838         int i;
 839         char *q = prs_mem_get(ps, len);
 840         if (q == NULL)
 841                 return False;
 842
 843         if (UNMARSHALLING(ps)) {
 844                 for (i = 0; i < len; i++)
 845                         data8s[i] = CVAL(q,i);
 846         } else {
 847                 for (i = 0; i < len; i++)
 848                         SCVAL(q, i, data8s[i]);
 849         }
 850
 851         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
 852         if (charmode)
 853                 print_asc(5, (unsigned char*)data8s, len);
 854         else {
 855                 for (i = 0; i < len; i++)
 856                         DEBUG(5,("%02x ", data8s[i]));
 857         }
 858         DEBUG(5,("\n"));
 859
 860         ps->data_offset += len;
 861
 862         return True;
 863 }
 864
 865 /******************************************************************
 866  Stream an array of uint16s. Length is number of uint16s.
 867  ********************************************************************/
 868
 869 BOOL prs_uint16s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 870 {
 871         int i;
 872         char *q = prs_mem_get(ps, len * sizeof(uint16));
 873         if (q == NULL)
 874                 return False;
 875
 876         if (UNMARSHALLING(ps)) {
 877                 if (ps->bigendian_data) {
 878                         for (i = 0; i < len; i++)
 879                                 data16s[i] = RSVAL(q, 2*i);
 880                 } else {
 881                         for (i = 0; i < len; i++)
 882                                 data16s[i] = SVAL(q, 2*i);
 883                 }
 884         } else {
 885                 if (ps->bigendian_data) {
 886                         for (i = 0; i < len; i++)
 887                                 RSSVAL(q, 2*i, data16s[i]);
 888                 } else {
 889                         for (i = 0; i < len; i++)
 890                                 SSVAL(q, 2*i, data16s[i]);
 891                 }
 892         }
 893
 894         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 895         if (charmode)
 896                 print_asc(5, (unsigned char*)data16s, 2*len);
 897         else {
 898                 for (i = 0; i < len; i++)
 899                         DEBUG(5,("%04x ", data16s[i]));
 900         }
 901         DEBUG(5,("\n"));
 902
 903         ps->data_offset += (len * sizeof(uint16));
 904
 905         return True;
 906 }
 907
 908 /******************************************************************
 909  Start using a function for streaming unicode chars. If unmarshalling,
 910  output must be little-endian, if marshalling, input must be little-endian.
 911  ********************************************************************/
 912
 913 static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
 914                                                         char *in_buf, char *out_buf, int len)
 915 {
 916         int i;
 917
 918         if (UNMARSHALLING(ps)) {
 919                 if (ps->bigendian_data) {
 920                         for (i = 0; i < len; i++)
 921                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 922                 } else {
 923                         for (i = 0; i < len; i++)
 924                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 925                 }
 926         } else {
 927                 if (ps->bigendian_data) {
 928                         for (i = 0; i < len; i++)
 929                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 930                 } else {
 931                         for (i = 0; i < len; i++)
 932                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 933                 }
 934         }
 935
 936         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 937         if (charmode)
 938                 print_asc(5, (unsigned char*)out_buf, 2*len);
 939         else {
 940                 for (i = 0; i < len; i++)
 941                         DEBUG(5,("%04x ", out_buf[i]));
 942         }
 943         DEBUG(5,("\n"));
 944 }
 945
 946 /******************************************************************
 947  Stream a unistr. Always little endian.
 948  ********************************************************************/
 949
 950 BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 951 {
 952         char *q = prs_mem_get(ps, len * sizeof(uint16));
 953         if (q == NULL)
 954                 return False;
 955
 956         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 957         ps->data_offset += (len * sizeof(uint16));
 958
 959         return True;
 960 }
 961
 962 /******************************************************************
 963  Stream an array of uint32s. Length is number of uint32s.
 964  ********************************************************************/
 965
 966 BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 967 {
 968         int i;
 969         char *q = prs_mem_get(ps, len * sizeof(uint32));
 970         if (q == NULL)
 971                 return False;
 972
 973         if (UNMARSHALLING(ps)) {
 974                 if (ps->bigendian_data) {
 975                         for (i = 0; i < len; i++)
 976                                 data32s[i] = RIVAL(q, 4*i);
 977                 } else {
 978                         for (i = 0; i < len; i++)
 979                                 data32s[i] = IVAL(q, 4*i);
 980                 }
 981         } else {
 982                 if (ps->bigendian_data) {
 983                         for (i = 0; i < len; i++)
 984                                 RSIVAL(q, 4*i, data32s[i]);
 985                 } else {
 986                         for (i = 0; i < len; i++)
 987                                 SIVAL(q, 4*i, data32s[i]);
 988                 }
 989         }
 990
 991         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 992         if (charmode)
 993                 print_asc(5, (unsigned char*)data32s, 4*len);
 994         else {
 995                 for (i = 0; i < len; i++)
 996                         DEBUG(5,("%08x ", data32s[i]));
 997         }
 998         DEBUG(5,("\n"));
 999
1000         ps->data_offset += (len * sizeof(uint32));
1001
1002         return True;
1003 }
1004
1005 /******************************************************************
1006  Stream an array of unicode string, length/buffer specified separately,
1007  in uint16 chars. The unicode string is already in little-endian format.
1008  ********************************************************************/
1009
1010 BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
1011 {
1012         char *p;
1013         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
1014         if (q == NULL)
1015                 return False;
1016
1017         if (UNMARSHALLING(ps)) {
1018                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
1019                 if (str->buffer == NULL)
1020                         return False;
1021         }
1022
1023         /* If the string is empty, we don't have anything to stream */
1024         if (str->buf_len==0)
1025                 return True;
1026
1027         p = (char *)str->buffer;
1028
1029         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
1030
1031         ps->data_offset += (str->buf_len * sizeof(uint16));
1032
1033         return True;
1034 }
1035
1036 /******************************************************************
1037  Stream a "not" unicode string, length/buffer specified separately,
1038  in byte chars. String is in little-endian format.
1039  ********************************************************************/
1040
1041 BOOL prs_regval_buffer(BOOL charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
1042 {
1043         char *p;
1044         char *q = prs_mem_get(ps, buf->buf_len);
1045         if (q == NULL)
1046                 return False;
1047
1048         if (UNMARSHALLING(ps)) {
1049                 if (buf->buf_len > buf->buf_max_len) {
1050                         return False;
1051                 }
1052                 if ( buf->buf_max_len ) {
1053                         buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
1054                         if ( buf->buffer == NULL )
1055                                 return False;
1056                 }
1057         }
1058
1059         p = (char *)buf->buffer;
1060
1061         dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
1062         ps->data_offset += buf->buf_len;
1063
1064         return True;
1065 }
1066
1067 /******************************************************************
1068  Stream a string, length/buffer specified separately,
1069  in uint8 chars.
1070  ********************************************************************/
1071
1072 BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
1073 {
1074         unsigned int i;
1075         char *q = prs_mem_get(ps, str->str_str_len);
1076         if (q == NULL)
1077                 return False;
1078
1079         if (UNMARSHALLING(ps)) {
1080                 if (str->str_str_len > str->str_max_len) {
1081                         return False;
1082                 }
1083                 str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
1084                 if (str->buffer == NULL)
1085                         return False;
1086         }
1087
1088         if (UNMARSHALLING(ps)) {
1089                 for (i = 0; i < str->str_str_len; i++)
1090                         str->buffer[i] = CVAL(q,i);
1091         } else {
1092                 for (i = 0; i < str->str_str_len; i++)
1093                         SCVAL(q, i, str->buffer[i]);
1094         }
1095
1096         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1097         if (charmode)
1098                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
1099         else {
1100                 for (i = 0; i < str->str_str_len; i++)
1101                         DEBUG(5,("%02x ", str->buffer[i]));
1102         }
1103         DEBUG(5,("\n"));
1104
1105         ps->data_offset += str->str_str_len;
1106
1107         return True;
1108 }
1109
1110 /******************************************************************
1111  Stream a unicode string, length/buffer specified separately,
1112  in uint16 chars. The unicode string is already in little-endian format.
1113  ********************************************************************/
1114
1115 BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1116 {
1117         char *p;
1118         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1119         if (q == NULL)
1120                 return False;
1121
1122         /* If the string is empty, we don't have anything to stream */
1123         if (str->uni_str_len==0)
1124                 return True;
1125
1126         if (UNMARSHALLING(ps)) {
1127                 if (str->uni_str_len > str->uni_max_len) {
1128                         return False;
1129                 }
1130                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1131                 if (str->buffer == NULL)
1132                         return False;
1133         }
1134
1135         p = (char *)str->buffer;
1136
1137         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1138
1139         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1140
1141         return True;
1142 }
1143
1144 /******************************************************************
1145  Stream a unicode string, length/buffer specified separately,
1146  in uint16 chars. The unicode string is already in little-endian format.
1147  ********************************************************************/
1148
1149 BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1150 {
1151         char *p;
1152         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1153         if (q == NULL)
1154                 return False;
1155
1156         if (UNMARSHALLING(ps)) {
1157                 str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1158                 if (str->str.buffer == NULL)
1159                         return False;
1160         }
1161
1162         p = (char *)str->str.buffer;
1163
1164         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1165         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1166
1167         return True;
1168 }
1169
1170 /*******************************************************************
1171  Stream a unicode  null-terminated string. As the string is already
1172  in little-endian format then do it as a stream of bytes.
1173  ********************************************************************/
1174
1175 BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1176 {
1177         unsigned int len = 0;
1178         unsigned char *p = (unsigned char *)str->buffer;
1179         uint8 *start;
1180         char *q;
1181         uint32 max_len;
1182         uint16* ptr;
1183
1184         if (MARSHALLING(ps)) {
1185
1186                 for(len = 0; str->buffer[len] != 0; len++)
1187                         ;
1188
1189                 q = prs_mem_get(ps, (len+1)*2);
1190                 if (q == NULL)
1191                         return False;
1192
1193                 start = (uint8*)q;
1194
1195                 for(len = 0; str->buffer[len] != 0; len++) {
1196                         if(ps->bigendian_data) {
1197                                 /* swap bytes - p is little endian, q is big endian. */
1198                                 q[0] = (char)p[1];
1199                                 q[1] = (char)p[0];
1200                                 p += 2;
1201                                 q += 2;
1202                         }
1203                         else
1204                         {
1205                                 q[0] = (char)p[0];
1206                                 q[1] = (char)p[1];
1207                                 p += 2;
1208                                 q += 2;
1209                         }
1210                 }
1211
1212                 /*
1213                  * even if the string is 'empty' (only an \0 char)
1214                  * at this point the leading \0 hasn't been parsed.
1215                  * so parse it now
1216                  */
1217
1218                 q[0] = 0;
1219                 q[1] = 0;
1220                 q += 2;
1221
1222                 len++;
1223
1224                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1225                 print_asc(5, (unsigned char*)start, 2*len);
1226                 DEBUG(5, ("\n"));
1227         }
1228         else { /* unmarshalling */
1229
1230                 uint32 alloc_len = 0;
1231                 q = ps->data_p + prs_offset(ps);
1232
1233                 /*
1234                  * Work out how much space we need and talloc it.
1235                  */
1236                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1237
1238                 /* the test of the value of *ptr helps to catch the circumstance
1239                    where we have an emtpty (non-existent) string in the buffer */
1240                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1241                         /* do nothing */
1242                         ;
1243
1244                 if (alloc_len < max_len)
1245                         alloc_len += 1;
1246
1247                 /* should we allocate anything at all? */
1248                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1249                 if ((str->buffer == NULL) && (alloc_len > 0))
1250                         return False;
1251
1252                 p = (unsigned char *)str->buffer;
1253
1254                 len = 0;
1255                 /* the (len < alloc_len) test is to prevent us from overwriting
1256                    memory that is not ours...if we get that far, we have a non-null
1257                    terminated string in the buffer and have messed up somewhere */
1258                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1259                         if(ps->bigendian_data)
1260                         {
1261                                 /* swap bytes - q is big endian, p is little endian. */
1262                                 p[0] = (unsigned char)q[1];
1263                                 p[1] = (unsigned char)q[0];
1264                                 p += 2;
1265                                 q += 2;
1266                         } else {
1267
1268                                 p[0] = (unsigned char)q[0];
1269                                 p[1] = (unsigned char)q[1];
1270                                 p += 2;
1271                                 q += 2;
1272                         }
1273
1274                         len++;
1275                 }
1276                 if (len < alloc_len) {
1277                         /* NULL terminate the UNISTR */
1278                         str->buffer[len++] = '\0';
1279                 }
1280
1281                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1282                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1283                 DEBUG(5, ("\n"));
1284         }
1285
1286         /* set the offset in the prs_struct; 'len' points to the
1287            terminiating NULL in the UNISTR so we need to go one more
1288            uint16 */
1289         ps->data_offset += (len)*2;
1290
1291         return True;
1292 }
1293
1294
1295 /*******************************************************************
1296  Stream a null-terminated string.  len is strlen, and therefore does
1297  not include the null-termination character.
1298  ********************************************************************/
1299
1300 BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1301 {
1302         char *q;
1303         int i;
1304         int len;
1305
1306         if (UNMARSHALLING(ps))
1307                 len = strlen(&ps->data_p[ps->data_offset]);
1308         else
1309                 len = strlen(str);
1310
1311         len = MIN(len, (max_buf_size-1));
1312
1313         q = prs_mem_get(ps, len+1);
1314         if (q == NULL)
1315                 return False;
1316
1317         for(i = 0; i < len; i++) {
1318                 if (UNMARSHALLING(ps))
1319                         str[i] = q[i];
1320                 else
1321                         q[i] = str[i];
1322         }
1323
1324         /* The terminating null. */
1325         str[i] = '\0';
1326
1327         if (MARSHALLING(ps)) {
1328                 q[i] = '\0';
1329         }
1330
1331         ps->data_offset += len+1;
1332
1333         dump_data(5+depth, q, len);
1334
1335         return True;
1336 }
1337
1338 BOOL prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str)
1339 {
1340         size_t len;
1341         char *tmp_str;
1342
1343         if (UNMARSHALLING(ps)) {
1344                 len = strlen(&ps->data_p[ps->data_offset]);
1345         } else {
1346                 len = strlen(*str);
1347         }
1348
1349         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1350
1351         if (tmp_str == NULL) {
1352                 return False;
1353         }
1354
1355         if (MARSHALLING(ps)) {
1356                 strncpy(tmp_str, *str, len);
1357         }
1358
1359         if (!prs_string(name, ps, depth, tmp_str, len+1)) {
1360                 return False;
1361         }
1362
1363         *str = tmp_str;
1364         return True;
1365 }
1366
1367 /*******************************************************************
1368  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1369  uint16 should be stored, or gets the size if reading.
1370  ********************************************************************/
1371
1372 BOOL prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1373 {
1374         *offset = ps->data_offset;
1375         if (UNMARSHALLING(ps)) {
1376                 /* reading. */
1377                 return prs_uint16(name, ps, depth, data16);
1378         } else {
1379                 char *q = prs_mem_get(ps, sizeof(uint16));
1380                 if(q ==NULL)
1381                         return False;
1382                 ps->data_offset += sizeof(uint16);
1383         }
1384         return True;
1385 }
1386
1387 /*******************************************************************
1388  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1389  does nothing on reading, as that is already handled by ...._pre()
1390  ********************************************************************/
1391
1392 BOOL prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1393                                 uint32 ptr_uint16, uint32 start_offset)
1394 {
1395         if (MARSHALLING(ps)) {
1396                 /*
1397                  * Writing - temporarily move the offset pointer.
1398                  */
1399                 uint16 data_size = ps->data_offset - start_offset;
1400                 uint32 old_offset = ps->data_offset;
1401
1402                 ps->data_offset = ptr_uint16;
1403                 if(!prs_uint16(name, ps, depth, &data_size)) {
1404                         ps->data_offset = old_offset;
1405                         return False;
1406                 }
1407                 ps->data_offset = old_offset;
1408         } else {
1409                 ps->data_offset = start_offset + (uint32)(*data16);
1410         }
1411         return True;
1412 }
1413
1414 /*******************************************************************
1415  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1416  uint32 should be stored, or gets the size if reading.
1417  ********************************************************************/
1418
1419 BOOL prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1420 {
1421         *offset = ps->data_offset;
1422         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1423                 /* reading. */
1424                 return prs_uint32(name, ps, depth, data32);
1425         } else {
1426                 ps->data_offset += sizeof(uint32);
1427         }
1428         return True;
1429 }
1430
1431 /*******************************************************************
1432  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1433  does nothing on reading, as that is already handled by ...._pre()
1434  ********************************************************************/
1435
1436 BOOL prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1437                                 uint32 ptr_uint32, uint32 data_size)
1438 {
1439         if (MARSHALLING(ps)) {
1440                 /*
1441                  * Writing - temporarily move the offset pointer.
1442                  */
1443                 uint32 old_offset = ps->data_offset;
1444                 ps->data_offset = ptr_uint32;
1445                 if(!prs_uint32(name, ps, depth, &data_size)) {
1446                         ps->data_offset = old_offset;
1447                         return False;
1448                 }
1449                 ps->data_offset = old_offset;
1450         }
1451         return True;
1452 }
1453
1454 /* useful function to store a structure in rpc wire format */
1455 int tdb_prs_store(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
1456 {
1457     TDB_DATA kbuf, dbuf;
1458     kbuf.dptr = keystr;
1459     kbuf.dsize = strlen(keystr)+1;
1460     dbuf.dptr = ps->data_p;
1461     dbuf.dsize = prs_offset(ps);
1462     return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
1463 }
1464
1465 /* useful function to fetch a structure into rpc wire format */
1466 int tdb_prs_fetch(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
1467 {
1468     TDB_DATA kbuf, dbuf;
1469     kbuf.dptr = keystr;
1470     kbuf.dsize = strlen(keystr)+1;
1471
1472     dbuf = tdb_fetch(tdb, kbuf);
1473     if (!dbuf.dptr)
1474             return -1;
1475
1476     prs_init(ps, 0, mem_ctx, UNMARSHALL);
1477     prs_give_memory(ps, dbuf.dptr, dbuf.dsize, True);
1478
1479     return 0;
1480 }
1481
1482 /*******************************************************************
1483  hash a stream.
1484  ********************************************************************/
1485
1486 BOOL prs_hash1(prs_struct *ps, uint32 offset, int len)
1487 {
1488         char *q;
1489
1490         q = ps->data_p;
1491         q = &q[offset];
1492
1493 #ifdef DEBUG_PASSWORD
1494         DEBUG(100, ("prs_hash1\n"));
1495         dump_data(100, ps->sess_key, 16);
1496         dump_data(100, q, len);
1497 #endif
1498         SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len);
1499
1500 #ifdef DEBUG_PASSWORD
1501         dump_data(100, q, len);
1502 #endif
1503
1504         return True;
1505 }
1506
1507 /*******************************************************************
1508  Create a digest over the entire packet (including the data), and
1509  MD5 it with the session key.
1510  ********************************************************************/
1511
1512 static void schannel_digest(struct schannel_auth_struct *a,
1513                           enum pipe_auth_level auth_level,
1514                           RPC_AUTH_SCHANNEL_CHK * verf,
1515                           char *data, size_t data_len,
1516                           uchar digest_final[16])
1517 {
1518         uchar whole_packet_digest[16];
1519         static uchar zeros[4];
1520         struct MD5Context ctx3;
1521
1522         /* verfiy the signature on the packet by MD5 over various bits */
1523         MD5Init(&ctx3);
1524         /* use our sequence number, which ensures the packet is not
1525            out of order */
1526         MD5Update(&ctx3, zeros, sizeof(zeros));
1527         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1528         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1529                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1530         }
1531         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1532         MD5Final(whole_packet_digest, &ctx3);
1533         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1534
1535         /* MD5 this result and the session key, to prove that
1536            only a valid client could had produced this */
1537         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1538 }
1539
1540 /*******************************************************************
1541  Calculate the key with which to encode the data payload
1542  ********************************************************************/
1543
1544 static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1545                                    RPC_AUTH_SCHANNEL_CHK *verf,
1546                                    uchar sealing_key[16])
1547 {
1548         static uchar zeros[4];
1549         uchar digest2[16];
1550         uchar sess_kf0[16];
1551         int i;
1552
1553         for (i = 0; i < sizeof(sess_kf0); i++) {
1554                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1555         }
1556
1557         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1558
1559         /* MD5 of sess_kf0 and 4 zero bytes */
1560         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1561         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1562
1563         /* MD5 of the above result, plus 8 bytes of sequence number */
1564         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1565         dump_data_pw("sealing_key:\n", sealing_key, 16);
1566 }
1567
1568 /*******************************************************************
1569  Encode or Decode the sequence number (which is symmetric)
1570  ********************************************************************/
1571
1572 static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1573                                      RPC_AUTH_SCHANNEL_CHK *verf)
1574 {
1575         static uchar zeros[4];
1576         uchar sequence_key[16];
1577         uchar digest1[16];
1578
1579         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1580         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1581
1582         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1583
1584         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1585
1586         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1587         SamOEMhash(verf->seq_num, sequence_key, 8);
1588         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1589 }
1590
1591 /*******************************************************************
1592 creates an RPC_AUTH_SCHANNEL_CHK structure.
1593 ********************************************************************/
1594
1595 static BOOL init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1596                               const uchar sig[8],
1597                               const uchar packet_digest[8],
1598                               const uchar seq_num[8], const uchar confounder[8])
1599 {
1600         if (chk == NULL)
1601                 return False;
1602
1603         memcpy(chk->sig, sig, sizeof(chk->sig));
1604         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1605         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1606         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1607
1608         return True;
1609 }
1610
1611 /*******************************************************************
1612  Encode a blob of data using the schannel alogrithm, also produceing
1613  a checksum over the original data.  We currently only support
1614  signing and sealing togeather - the signing-only code is close, but not
1615  quite compatible with what MS does.
1616  ********************************************************************/
1617
1618 void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1619                    enum schannel_direction direction,
1620                    RPC_AUTH_SCHANNEL_CHK * verf,
1621                    char *data, size_t data_len)
1622 {
1623         uchar digest_final[16];
1624         uchar confounder[8];
1625         uchar seq_num[8];
1626         static const uchar nullbytes[8];
1627
1628         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1629         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1630         const uchar *schannel_sig = NULL;
1631
1632         DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1633
1634         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1635                 schannel_sig = schannel_seal_sig;
1636         } else {
1637                 schannel_sig = schannel_sign_sig;
1638         }
1639
1640         /* fill the 'confounder' with random data */
1641         generate_random_buffer(confounder, sizeof(confounder));
1642
1643         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1644
1645         RSIVAL(seq_num, 0, a->seq_num);
1646
1647         switch (direction) {
1648         case SENDER_IS_INITIATOR:
1649                 SIVAL(seq_num, 4, 0x80);
1650                 break;
1651         case SENDER_IS_ACCEPTOR:
1652                 SIVAL(seq_num, 4, 0x0);
1653                 break;
1654         }
1655
1656         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1657
1658         init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1659                                  seq_num, confounder);
1660
1661         /* produce a digest of the packet to prove it's legit (before we seal it) */
1662         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1663         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1664
1665         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1666                 uchar sealing_key[16];
1667
1668                 /* get the key to encode the data with */
1669                 schannel_get_sealing_key(a, verf, sealing_key);
1670
1671                 /* encode the verification data */
1672                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1673                 SamOEMhash(verf->confounder, sealing_key, 8);
1674
1675                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1676
1677                 /* encode the packet payload */
1678                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1679                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1680                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1681         }
1682
1683         /* encode the sequence number (key based on packet digest) */
1684         /* needs to be done after the sealing, as the original version
1685            is used in the sealing stuff... */
1686         schannel_deal_with_seq_num(a, verf);
1687
1688         return;
1689 }
1690
1691 /*******************************************************************
1692  Decode a blob of data using the schannel alogrithm, also verifiying
1693  a checksum over the original data.  We currently can verify signed messages,
1694  as well as decode sealed messages
1695  ********************************************************************/
1696
1697 BOOL schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1698                    enum schannel_direction direction,
1699                    RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1700 {
1701         uchar digest_final[16];
1702
1703         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1704         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1705         const uchar *schannel_sig = NULL;
1706
1707         uchar seq_num[8];
1708
1709         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1710
1711         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1712                 schannel_sig = schannel_seal_sig;
1713         } else {
1714                 schannel_sig = schannel_sign_sig;
1715         }
1716
1717         /* Create the expected sequence number for comparison */
1718         RSIVAL(seq_num, 0, a->seq_num);
1719
1720         switch (direction) {
1721         case SENDER_IS_INITIATOR:
1722                 SIVAL(seq_num, 4, 0x80);
1723                 break;
1724         case SENDER_IS_ACCEPTOR:
1725                 SIVAL(seq_num, 4, 0x0);
1726                 break;
1727         }
1728
1729         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1730         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1731
1732         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1733
1734         /* extract the sequence number (key based on supplied packet digest) */
1735         /* needs to be done before the sealing, as the original version
1736            is used in the sealing stuff... */
1737         schannel_deal_with_seq_num(a, verf);
1738
1739         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1740                 /* don't even bother with the below if the sequence number is out */
1741                 /* The sequence number is MD5'ed with a key based on the whole-packet
1742                    digest, as supplied by the client.  We check that it's a valid
1743                    checksum after the decode, below
1744                 */
1745                 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1746                 dump_data(2, (const char*)verf->seq_num, sizeof(verf->seq_num));
1747                 DEBUG(2, ("should be:\n"));
1748                 dump_data(2, (const char*)seq_num, sizeof(seq_num));
1749
1750                 return False;
1751         }
1752
1753         if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1754                 /* Validate that the other end sent the expected header */
1755                 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1756                 dump_data(2, (const char*)verf->sig, sizeof(verf->sig));
1757                 DEBUG(2, ("should be:\n"));
1758                 dump_data(2, (const char*)schannel_sig, sizeof(schannel_sig));
1759                 return False;
1760         }
1761
1762         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1763                 uchar sealing_key[16];
1764
1765                 /* get the key to extract the data with */
1766                 schannel_get_sealing_key(a, verf, sealing_key);
1767
1768                 /* extract the verification data */
1769                 dump_data_pw("verf->confounder:\n", verf->confounder,
1770                              sizeof(verf->confounder));
1771                 SamOEMhash(verf->confounder, sealing_key, 8);
1772
1773                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1774                              sizeof(verf->confounder));
1775
1776                 /* extract the packet payload */
1777                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1778                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1779                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1780         }
1781
1782         /* digest includes 'data' after unsealing */
1783         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1784
1785         dump_data_pw("Calculated digest:\n", digest_final,
1786                      sizeof(digest_final));
1787         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1788                      sizeof(verf->packet_digest));
1789
1790         /* compare - if the client got the same result as us, then
1791            it must know the session key */
1792         return (memcmp(digest_final, verf->packet_digest,
1793                        sizeof(verf->packet_digest)) == 0);
1794 }