source/rpc_parse/parse_prs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba memory buffer functions
   4    Copyright (C) Andrew Tridgell              1992-1997
   5    Copyright (C) Luke Kenneth Casson Leighton 1996-1997
   6    Copyright (C) Jeremy Allison               1999
   7    Copyright (C) Andrew Bartlett              2003.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_RPC_PARSE
  28
  29 /**
  30  * Dump a prs to a file: from the current location through to the end.
  31  **/
  32 void prs_dump(char *name, int v, prs_struct *ps)
  33 {
  34         prs_dump_region(name, v, ps, ps->data_offset, ps->buffer_size);
  35 }
  36
  37 /**
  38  * Dump from the start of the prs to the current location.
  39  **/
  40 void prs_dump_before(char *name, int v, prs_struct *ps)
  41 {
  42         prs_dump_region(name, v, ps, 0, ps->data_offset);
  43 }
  44
  45 /**
  46  * Dump everything from the start of the prs up to the current location.
  47  **/
  48 void prs_dump_region(char *name, int v, prs_struct *ps,
  49                      int from_off, int to_off)
  50 {
  51         int fd, i;
  52         pstring fname;
  53         ssize_t sz;
  54         if (DEBUGLEVEL < 50) return;
  55         for (i=1;i<100;i++) {
  56                 if (v != -1) {
  57                         slprintf(fname,sizeof(fname)-1, "/tmp/%s_%d.%d.prs", name, v, i);
  58                 } else {
  59                         slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.prs", name, i);
  60                 }
  61                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
  62                 if (fd != -1 || errno != EEXIST) break;
  63         }
  64         if (fd != -1) {
  65                 sz = write(fd, ps->data_p + from_off, to_off - from_off);
  66                 i = close(fd);
  67                 if ( (sz != to_off-from_off) || (i != 0) ) {
  68                         DEBUG(0,("Error writing/closing %s: %ld!=%ld %d\n", fname, (unsigned long)sz, (unsigned long)to_off-from_off, i ));
  69                 } else {
  70                         DEBUG(0,("created %s\n", fname));
  71                 }
  72         }
  73 }
  74
  75 /*******************************************************************
  76  Debug output for parsing info
  77
  78  XXXX side-effect of this function is to increase the debug depth XXXX.
  79
  80 ********************************************************************/
  81
  82 void prs_debug(prs_struct *ps, int depth, const char *desc, const char *fn_name)
  83 {
  84         DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(depth), ps->data_offset, fn_name, desc));
  85 }
  86
  87 /**
  88  * Initialise an expandable parse structure.
  89  *
  90  * @param size Initial buffer size.  If >0, a new buffer will be
  91  * created with malloc().
  92  *
  93  * @return False if allocation fails, otherwise True.
  94  **/
  95
  96 BOOL prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, BOOL io)
  97 {
  98         ZERO_STRUCTP(ps);
  99         ps->io = io;
 100         ps->bigendian_data = RPC_LITTLE_ENDIAN;
 101         ps->align = RPC_PARSE_ALIGN;
 102         ps->is_dynamic = False;
 103         ps->data_offset = 0;
 104         ps->buffer_size = 0;
 105         ps->data_p = NULL;
 106         ps->mem_ctx = ctx;
 107
 108         if (size != 0) {
 109                 ps->buffer_size = size;
 110                 if((ps->data_p = (char *)SMB_MALLOC((size_t)size)) == NULL) {
 111                         DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
 112                         return False;
 113                 }
 114                 memset(ps->data_p, '\0', (size_t)size);
 115                 ps->is_dynamic = True; /* We own this memory. */
 116         } else if (MARSHALLING(ps)) {
 117                 /* If size is zero and we're marshalling we should allocate memory on demand. */
 118                 ps->is_dynamic = True;
 119         }
 120
 121         return True;
 122 }
 123
 124 /*******************************************************************
 125  Delete the memory in a parse structure - if we own it.
 126  ********************************************************************/
 127
 128 void prs_mem_free(prs_struct *ps)
 129 {
 130         if(ps->is_dynamic)
 131                 SAFE_FREE(ps->data_p);
 132         ps->is_dynamic = False;
 133         ps->buffer_size = 0;
 134         ps->data_offset = 0;
 135 }
 136
 137 /*******************************************************************
 138  Clear the memory in a parse structure.
 139  ********************************************************************/
 140
 141 void prs_mem_clear(prs_struct *ps)
 142 {
 143         if (ps->buffer_size)
 144                 memset(ps->data_p, '\0', (size_t)ps->buffer_size);
 145 }
 146
 147 /*******************************************************************
 148  Allocate memory when unmarshalling... Always zero clears.
 149  ********************************************************************/
 150
 151 #if defined(PARANOID_MALLOC_CHECKER)
 152 char *prs_alloc_mem_(prs_struct *ps, size_t size, unsigned int count)
 153 #else
 154 char *prs_alloc_mem(prs_struct *ps, size_t size, unsigned int count)
 155 #endif
 156 {
 157         char *ret = NULL;
 158
 159         if (size) {
 160                 /* We can't call the type-safe version here. */
 161                 ret = (char *)_talloc_zero_array(ps->mem_ctx, size, count,
 162                                                  "parse_prs");
 163         }
 164         return ret;
 165 }
 166
 167 /*******************************************************************
 168  Return the current talloc context we're using.
 169  ********************************************************************/
 170
 171 TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
 172 {
 173         return ps->mem_ctx;
 174 }
 175
 176 /*******************************************************************
 177  Hand some already allocated memory to a prs_struct.
 178  ********************************************************************/
 179
 180 void prs_give_memory(prs_struct *ps, char *buf, uint32 size, BOOL is_dynamic)
 181 {
 182         ps->is_dynamic = is_dynamic;
 183         ps->data_p = buf;
 184         ps->buffer_size = size;
 185 }
 186
 187 /*******************************************************************
 188  Take some memory back from a prs_struct.
 189  ********************************************************************/
 190
 191 char *prs_take_memory(prs_struct *ps, uint32 *psize)
 192 {
 193         char *ret = ps->data_p;
 194         if(psize)
 195                 *psize = ps->buffer_size;
 196         ps->is_dynamic = False;
 197         prs_mem_free(ps);
 198         return ret;
 199 }
 200
 201 /*******************************************************************
 202  Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
 203  ********************************************************************/
 204
 205 BOOL prs_set_buffer_size(prs_struct *ps, uint32 newsize)
 206 {
 207         if (newsize > ps->buffer_size)
 208                 return prs_force_grow(ps, newsize - ps->buffer_size);
 209
 210         if (newsize < ps->buffer_size) {
 211                 ps->buffer_size = newsize;
 212
 213                 /* newsize == 0 acts as a free and set pointer to NULL */
 214                 if (newsize == 0) {
 215                         SAFE_FREE(ps->data_p);
 216                 } else {
 217                         ps->data_p = (char *)SMB_REALLOC(ps->data_p, newsize);
 218
 219                         if (ps->data_p == NULL) {
 220                                 DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
 221                                         (unsigned int)newsize));
 222                                 DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
 223                                 return False;
 224                         }
 225                 }
 226         }
 227
 228         return True;
 229 }
 230
 231 /*******************************************************************
 232  Attempt, if needed, to grow a data buffer.
 233  Also depends on the data stream mode (io).
 234  ********************************************************************/
 235
 236 BOOL prs_grow(prs_struct *ps, uint32 extra_space)
 237 {
 238         uint32 new_size;
 239
 240         ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
 241
 242         if(ps->data_offset + extra_space <= ps->buffer_size)
 243                 return True;
 244
 245         /*
 246          * We cannot grow the buffer if we're not reading
 247          * into the prs_struct, or if we don't own the memory.
 248          */
 249
 250         if(UNMARSHALLING(ps) || !ps->is_dynamic) {
 251                 DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 252                                 (unsigned int)extra_space));
 253                 return False;
 254         }
 255
 256         /*
 257          * Decide how much extra space we really need.
 258          */
 259
 260         extra_space -= (ps->buffer_size - ps->data_offset);
 261         if(ps->buffer_size == 0) {
 262                 /*
 263                  * Ensure we have at least a PDU's length, or extra_space, whichever
 264                  * is greater.
 265                  */
 266
 267                 new_size = MAX(RPC_MAX_PDU_FRAG_LEN,extra_space);
 268
 269                 if((ps->data_p = (char *)SMB_MALLOC(new_size)) == NULL) {
 270                         DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
 271                         return False;
 272                 }
 273                 memset(ps->data_p, '\0', (size_t)new_size );
 274         } else {
 275                 /*
 276                  * If the current buffer size is bigger than the space needed, just
 277                  * double it, else add extra_space.
 278                  */
 279                 new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);
 280
 281                 if ((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 282                         DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
 283                                 (unsigned int)new_size));
 284                         return False;
 285                 }
 286
 287                 memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 288         }
 289         ps->buffer_size = new_size;
 290
 291         return True;
 292 }
 293
 294 /*******************************************************************
 295  Attempt to force a data buffer to grow by len bytes.
 296  This is only used when appending more data onto a prs_struct
 297  when reading an rpc reply, before unmarshalling it.
 298  ********************************************************************/
 299
 300 BOOL prs_force_grow(prs_struct *ps, uint32 extra_space)
 301 {
 302         uint32 new_size = ps->buffer_size + extra_space;
 303
 304         if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
 305                 DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 306                                 (unsigned int)extra_space));
 307                 return False;
 308         }
 309
 310         if((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 311                 DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
 312                         (unsigned int)new_size));
 313                 return False;
 314         }
 315
 316         memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 317
 318         ps->buffer_size = new_size;
 319
 320         return True;
 321 }
 322
 323 /*******************************************************************
 324  Get the data pointer (external interface).
 325 ********************************************************************/
 326
 327 char *prs_data_p(prs_struct *ps)
 328 {
 329         return ps->data_p;
 330 }
 331
 332 /*******************************************************************
 333  Get the current data size (external interface).
 334  ********************************************************************/
 335
 336 uint32 prs_data_size(prs_struct *ps)
 337 {
 338         return ps->buffer_size;
 339 }
 340
 341 /*******************************************************************
 342  Fetch the current offset (external interface).
 343  ********************************************************************/
 344
 345 uint32 prs_offset(prs_struct *ps)
 346 {
 347         return ps->data_offset;
 348 }
 349
 350 /*******************************************************************
 351  Set the current offset (external interface).
 352  ********************************************************************/
 353
 354 BOOL prs_set_offset(prs_struct *ps, uint32 offset)
 355 {
 356         if(offset <= ps->data_offset) {
 357                 ps->data_offset = offset;
 358                 return True;
 359         }
 360
 361         if(!prs_grow(ps, offset - ps->data_offset))
 362                 return False;
 363
 364         ps->data_offset = offset;
 365         return True;
 366 }
 367
 368 /*******************************************************************
 369  Append the data from one parse_struct into another.
 370  ********************************************************************/
 371
 372 BOOL prs_append_prs_data(prs_struct *dst, prs_struct *src)
 373 {
 374         if (prs_offset(src) == 0)
 375                 return True;
 376
 377         if(!prs_grow(dst, prs_offset(src)))
 378                 return False;
 379
 380         memcpy(&dst->data_p[dst->data_offset], src->data_p, (size_t)prs_offset(src));
 381         dst->data_offset += prs_offset(src);
 382
 383         return True;
 384 }
 385
 386 /*******************************************************************
 387  Append some data from one parse_struct into another.
 388  ********************************************************************/
 389
 390 BOOL prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, uint32 len)
 391 {
 392         if (len == 0)
 393                 return True;
 394
 395         if(!prs_grow(dst, len))
 396                 return False;
 397
 398         memcpy(&dst->data_p[dst->data_offset], src->data_p + start, (size_t)len);
 399         dst->data_offset += len;
 400
 401         return True;
 402 }
 403
 404 /*******************************************************************
 405  Append the data from a buffer into a parse_struct.
 406  ********************************************************************/
 407
 408 BOOL prs_copy_data_in(prs_struct *dst, const char *src, uint32 len)
 409 {
 410         if (len == 0)
 411                 return True;
 412
 413         if(!prs_grow(dst, len))
 414                 return False;
 415
 416         memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
 417         dst->data_offset += len;
 418
 419         return True;
 420 }
 421
 422 /*******************************************************************
 423  Copy some data from a parse_struct into a buffer.
 424  ********************************************************************/
 425
 426 BOOL prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
 427 {
 428         if (len == 0)
 429                 return True;
 430
 431         if(!prs_mem_get(src, len))
 432                 return False;
 433
 434         memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
 435         src->data_offset += len;
 436
 437         return True;
 438 }
 439
 440 /*******************************************************************
 441  Copy all the data from a parse_struct into a buffer.
 442  ********************************************************************/
 443
 444 BOOL prs_copy_all_data_out(char *dst, prs_struct *src)
 445 {
 446         uint32 len = prs_offset(src);
 447
 448         if (!len)
 449                 return True;
 450
 451         prs_set_offset(src, 0);
 452         return prs_copy_data_out(dst, src, len);
 453 }
 454
 455 /*******************************************************************
 456  Set the data as X-endian (external interface).
 457  ********************************************************************/
 458
 459 void prs_set_endian_data(prs_struct *ps, BOOL endian)
 460 {
 461         ps->bigendian_data = endian;
 462 }
 463
 464 /*******************************************************************
 465  Align a the data_len to a multiple of align bytes - filling with
 466  zeros.
 467  ********************************************************************/
 468
 469 BOOL prs_align(prs_struct *ps)
 470 {
 471         uint32 mod = ps->data_offset & (ps->align-1);
 472
 473         if (ps->align != 0 && mod != 0) {
 474                 uint32 extra_space = (ps->align - mod);
 475                 if(!prs_grow(ps, extra_space))
 476                         return False;
 477                 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
 478                 ps->data_offset += extra_space;
 479         }
 480
 481         return True;
 482 }
 483
 484 /******************************************************************
 485  Align on a 2 byte boundary
 486  *****************************************************************/
 487
 488 BOOL prs_align_uint16(prs_struct *ps)
 489 {
 490         BOOL ret;
 491         uint8 old_align = ps->align;
 492
 493         ps->align = 2;
 494         ret = prs_align(ps);
 495         ps->align = old_align;
 496
 497         return ret;
 498 }
 499
 500 /******************************************************************
 501  Align on a 8 byte boundary
 502  *****************************************************************/
 503
 504 BOOL prs_align_uint64(prs_struct *ps)
 505 {
 506         BOOL ret;
 507         uint8 old_align = ps->align;
 508
 509         ps->align = 8;
 510         ret = prs_align(ps);
 511         ps->align = old_align;
 512
 513         return ret;
 514 }
 515
 516 /******************************************************************
 517  Align on a specific byte boundary
 518  *****************************************************************/
 519
 520 BOOL prs_align_custom(prs_struct *ps, uint8 boundary)
 521 {
 522         BOOL ret;
 523         uint8 old_align = ps->align;
 524
 525         ps->align = boundary;
 526         ret = prs_align(ps);
 527         ps->align = old_align;
 528
 529         return ret;
 530 }
 531
 532
 533
 534 /*******************************************************************
 535  Align only if required (for the unistr2 string mainly)
 536  ********************************************************************/
 537
 538 BOOL prs_align_needed(prs_struct *ps, uint32 needed)
 539 {
 540         if (needed==0)
 541                 return True;
 542         else
 543                 return prs_align(ps);
 544 }
 545
 546 /*******************************************************************
 547  Ensure we can read/write to a given offset.
 548  ********************************************************************/
 549
 550 char *prs_mem_get(prs_struct *ps, uint32 extra_size)
 551 {
 552         if(UNMARSHALLING(ps)) {
 553                 /*
 554                  * If reading, ensure that we can read the requested size item.
 555                  */
 556                 if (ps->data_offset + extra_size > ps->buffer_size) {
 557                         DEBUG(0,("prs_mem_get: reading data of size %u would overrun "
 558                                 "buffer by %u bytes.\n",
 559                                 (unsigned int)extra_size,
 560                                 (unsigned int)(ps->data_offset + extra_size - ps->buffer_size) ));
 561                         return NULL;
 562                 }
 563         } else {
 564                 /*
 565                  * Writing - grow the buffer if needed.
 566                  */
 567                 if(!prs_grow(ps, extra_size))
 568                         return NULL;
 569         }
 570         return &ps->data_p[ps->data_offset];
 571 }
 572
 573 /*******************************************************************
 574  Change the struct type.
 575  ********************************************************************/
 576
 577 void prs_switch_type(prs_struct *ps, BOOL io)
 578 {
 579         if ((ps->io ^ io) == True)
 580                 ps->io=io;
 581 }
 582
 583 /*******************************************************************
 584  Force a prs_struct to be dynamic even when it's size is 0.
 585  ********************************************************************/
 586
 587 void prs_force_dynamic(prs_struct *ps)
 588 {
 589         ps->is_dynamic=True;
 590 }
 591
 592 /*******************************************************************
 593  Associate a session key with a parse struct.
 594  ********************************************************************/
 595
 596 void prs_set_session_key(prs_struct *ps, const char sess_key[16])
 597 {
 598         ps->sess_key = sess_key;
 599 }
 600
 601 /*******************************************************************
 602  Stream a uint8.
 603  ********************************************************************/
 604
 605 BOOL prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
 606 {
 607         char *q = prs_mem_get(ps, 1);
 608         if (q == NULL)
 609                 return False;
 610
 611         if (UNMARSHALLING(ps))
 612                 *data8 = CVAL(q,0);
 613         else
 614                 SCVAL(q,0,*data8);
 615
 616         DEBUG(5,("%s%04x %s: %02x\n", tab_depth(depth), ps->data_offset, name, *data8));
 617
 618         ps->data_offset += 1;
 619
 620         return True;
 621 }
 622
 623 /*******************************************************************
 624  Stream a uint16* (allocate memory if unmarshalling)
 625  ********************************************************************/
 626
 627 BOOL prs_pointer( const char *name, prs_struct *ps, int depth,
 628                  void *dta, size_t data_size,
 629                  BOOL(*prs_fn)(const char*, prs_struct*, int, void*) )
 630 {
 631         void ** data = (void **)dta;
 632         uint32 data_p;
 633
 634         /* output f000baaa to stream if the pointer is non-zero. */
 635
 636         data_p = *data ? 0xf000baaa : 0;
 637
 638         if ( !prs_uint32("ptr", ps, depth, &data_p ))
 639                 return False;
 640
 641         /* we're done if there is no data */
 642
 643         if ( !data_p )
 644                 return True;
 645
 646         if (UNMARSHALLING(ps)) {
 647                 if ( !(*data = PRS_ALLOC_MEM_VOID(ps, data_size)) )
 648                         return False;
 649         }
 650
 651         return prs_fn(name, ps, depth, *data);
 652 }
 653
 654
 655 /*******************************************************************
 656  Stream a uint16.
 657  ********************************************************************/
 658
 659 BOOL prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
 660 {
 661         char *q = prs_mem_get(ps, sizeof(uint16));
 662         if (q == NULL)
 663                 return False;
 664
 665         if (UNMARSHALLING(ps)) {
 666                 if (ps->bigendian_data)
 667                         *data16 = RSVAL(q,0);
 668                 else
 669                         *data16 = SVAL(q,0);
 670         } else {
 671                 if (ps->bigendian_data)
 672                         RSSVAL(q,0,*data16);
 673                 else
 674                         SSVAL(q,0,*data16);
 675         }
 676
 677         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));
 678
 679         ps->data_offset += sizeof(uint16);
 680
 681         return True;
 682 }
 683
 684 /*******************************************************************
 685  Stream a uint32.
 686  ********************************************************************/
 687
 688 BOOL prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
 689 {
 690         char *q = prs_mem_get(ps, sizeof(uint32));
 691         if (q == NULL)
 692                 return False;
 693
 694         if (UNMARSHALLING(ps)) {
 695                 if (ps->bigendian_data)
 696                         *data32 = RIVAL(q,0);
 697                 else
 698                         *data32 = IVAL(q,0);
 699         } else {
 700                 if (ps->bigendian_data)
 701                         RSIVAL(q,0,*data32);
 702                 else
 703                         SIVAL(q,0,*data32);
 704         }
 705
 706         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 707
 708         ps->data_offset += sizeof(uint32);
 709
 710         return True;
 711 }
 712
 713 /*******************************************************************
 714  Stream an int32.
 715  ********************************************************************/
 716
 717 BOOL prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
 718 {
 719         char *q = prs_mem_get(ps, sizeof(int32));
 720         if (q == NULL)
 721                 return False;
 722
 723         if (UNMARSHALLING(ps)) {
 724                 if (ps->bigendian_data)
 725                         *data32 = RIVALS(q,0);
 726                 else
 727                         *data32 = IVALS(q,0);
 728         } else {
 729                 if (ps->bigendian_data)
 730                         RSIVALS(q,0,*data32);
 731                 else
 732                         SIVALS(q,0,*data32);
 733         }
 734
 735         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 736
 737         ps->data_offset += sizeof(int32);
 738
 739         return True;
 740 }
 741
 742 /*******************************************************************
 743  Stream a NTSTATUS
 744  ********************************************************************/
 745
 746 BOOL prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 747 {
 748         char *q = prs_mem_get(ps, sizeof(uint32));
 749         if (q == NULL)
 750                 return False;
 751
 752         if (UNMARSHALLING(ps)) {
 753                 if (ps->bigendian_data)
 754                         *status = NT_STATUS(RIVAL(q,0));
 755                 else
 756                         *status = NT_STATUS(IVAL(q,0));
 757         } else {
 758                 if (ps->bigendian_data)
 759                         RSIVAL(q,0,NT_STATUS_V(*status));
 760                 else
 761                         SIVAL(q,0,NT_STATUS_V(*status));
 762         }
 763
 764         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 765                  nt_errstr(*status)));
 766
 767         ps->data_offset += sizeof(uint32);
 768
 769         return True;
 770 }
 771
 772 /*******************************************************************
 773  Stream a DCE error code
 774  ********************************************************************/
 775
 776 BOOL prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 777 {
 778         char *q = prs_mem_get(ps, sizeof(uint32));
 779         if (q == NULL)
 780                 return False;
 781
 782         if (UNMARSHALLING(ps)) {
 783                 if (ps->bigendian_data)
 784                         *status = NT_STATUS(RIVAL(q,0));
 785                 else
 786                         *status = NT_STATUS(IVAL(q,0));
 787         } else {
 788                 if (ps->bigendian_data)
 789                         RSIVAL(q,0,NT_STATUS_V(*status));
 790                 else
 791                         SIVAL(q,0,NT_STATUS_V(*status));
 792         }
 793
 794         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 795                  dcerpc_errstr(NT_STATUS_V(*status))));
 796
 797         ps->data_offset += sizeof(uint32);
 798
 799         return True;
 800 }
 801
 802
 803 /*******************************************************************
 804  Stream a WERROR
 805  ********************************************************************/
 806
 807 BOOL prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 808 {
 809         char *q = prs_mem_get(ps, sizeof(uint32));
 810         if (q == NULL)
 811                 return False;
 812
 813         if (UNMARSHALLING(ps)) {
 814                 if (ps->bigendian_data)
 815                         *status = W_ERROR(RIVAL(q,0));
 816                 else
 817                         *status = W_ERROR(IVAL(q,0));
 818         } else {
 819                 if (ps->bigendian_data)
 820                         RSIVAL(q,0,W_ERROR_V(*status));
 821                 else
 822                         SIVAL(q,0,W_ERROR_V(*status));
 823         }
 824
 825         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 826                  dos_errstr(*status)));
 827
 828         ps->data_offset += sizeof(uint32);
 829
 830         return True;
 831 }
 832
 833
 834 /******************************************************************
 835  Stream an array of uint8s. Length is number of uint8s.
 836  ********************************************************************/
 837
 838 BOOL prs_uint8s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 839 {
 840         int i;
 841         char *q = prs_mem_get(ps, len);
 842         if (q == NULL)
 843                 return False;
 844
 845         if (UNMARSHALLING(ps)) {
 846                 for (i = 0; i < len; i++)
 847                         data8s[i] = CVAL(q,i);
 848         } else {
 849                 for (i = 0; i < len; i++)
 850                         SCVAL(q, i, data8s[i]);
 851         }
 852
 853         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
 854         if (charmode)
 855                 print_asc(5, (unsigned char*)data8s, len);
 856         else {
 857                 for (i = 0; i < len; i++)
 858                         DEBUG(5,("%02x ", data8s[i]));
 859         }
 860         DEBUG(5,("\n"));
 861
 862         ps->data_offset += len;
 863
 864         return True;
 865 }
 866
 867 /******************************************************************
 868  Stream an array of uint16s. Length is number of uint16s.
 869  ********************************************************************/
 870
 871 BOOL prs_uint16s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 872 {
 873         int i;
 874         char *q = prs_mem_get(ps, len * sizeof(uint16));
 875         if (q == NULL)
 876                 return False;
 877
 878         if (UNMARSHALLING(ps)) {
 879                 if (ps->bigendian_data) {
 880                         for (i = 0; i < len; i++)
 881                                 data16s[i] = RSVAL(q, 2*i);
 882                 } else {
 883                         for (i = 0; i < len; i++)
 884                                 data16s[i] = SVAL(q, 2*i);
 885                 }
 886         } else {
 887                 if (ps->bigendian_data) {
 888                         for (i = 0; i < len; i++)
 889                                 RSSVAL(q, 2*i, data16s[i]);
 890                 } else {
 891                         for (i = 0; i < len; i++)
 892                                 SSVAL(q, 2*i, data16s[i]);
 893                 }
 894         }
 895
 896         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 897         if (charmode)
 898                 print_asc(5, (unsigned char*)data16s, 2*len);
 899         else {
 900                 for (i = 0; i < len; i++)
 901                         DEBUG(5,("%04x ", data16s[i]));
 902         }
 903         DEBUG(5,("\n"));
 904
 905         ps->data_offset += (len * sizeof(uint16));
 906
 907         return True;
 908 }
 909
 910 /******************************************************************
 911  Start using a function for streaming unicode chars. If unmarshalling,
 912  output must be little-endian, if marshalling, input must be little-endian.
 913  ********************************************************************/
 914
 915 static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
 916                                                         char *in_buf, char *out_buf, int len)
 917 {
 918         int i;
 919
 920         if (UNMARSHALLING(ps)) {
 921                 if (ps->bigendian_data) {
 922                         for (i = 0; i < len; i++)
 923                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 924                 } else {
 925                         for (i = 0; i < len; i++)
 926                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 927                 }
 928         } else {
 929                 if (ps->bigendian_data) {
 930                         for (i = 0; i < len; i++)
 931                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 932                 } else {
 933                         for (i = 0; i < len; i++)
 934                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 935                 }
 936         }
 937
 938         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 939         if (charmode)
 940                 print_asc(5, (unsigned char*)out_buf, 2*len);
 941         else {
 942                 for (i = 0; i < len; i++)
 943                         DEBUG(5,("%04x ", out_buf[i]));
 944         }
 945         DEBUG(5,("\n"));
 946 }
 947
 948 /******************************************************************
 949  Stream a unistr. Always little endian.
 950  ********************************************************************/
 951
 952 BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 953 {
 954         char *q = prs_mem_get(ps, len * sizeof(uint16));
 955         if (q == NULL)
 956                 return False;
 957
 958         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 959         ps->data_offset += (len * sizeof(uint16));
 960
 961         return True;
 962 }
 963
 964 /******************************************************************
 965  Stream an array of uint32s. Length is number of uint32s.
 966  ********************************************************************/
 967
 968 BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 969 {
 970         int i;
 971         char *q = prs_mem_get(ps, len * sizeof(uint32));
 972         if (q == NULL)
 973                 return False;
 974
 975         if (UNMARSHALLING(ps)) {
 976                 if (ps->bigendian_data) {
 977                         for (i = 0; i < len; i++)
 978                                 data32s[i] = RIVAL(q, 4*i);
 979                 } else {
 980                         for (i = 0; i < len; i++)
 981                                 data32s[i] = IVAL(q, 4*i);
 982                 }
 983         } else {
 984                 if (ps->bigendian_data) {
 985                         for (i = 0; i < len; i++)
 986                                 RSIVAL(q, 4*i, data32s[i]);
 987                 } else {
 988                         for (i = 0; i < len; i++)
 989                                 SIVAL(q, 4*i, data32s[i]);
 990                 }
 991         }
 992
 993         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 994         if (charmode)
 995                 print_asc(5, (unsigned char*)data32s, 4*len);
 996         else {
 997                 for (i = 0; i < len; i++)
 998                         DEBUG(5,("%08x ", data32s[i]));
 999         }
1000         DEBUG(5,("\n"));
1001
1002         ps->data_offset += (len * sizeof(uint32));
1003
1004         return True;
1005 }
1006
1007 /******************************************************************
1008  Stream an array of unicode string, length/buffer specified separately,
1009  in uint16 chars. The unicode string is already in little-endian format.
1010  ********************************************************************/
1011
1012 BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
1013 {
1014         char *p;
1015         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
1016         if (q == NULL)
1017                 return False;
1018
1019         if (UNMARSHALLING(ps)) {
1020                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
1021                 if (str->buffer == NULL)
1022                         return False;
1023         }
1024
1025         /* If the string is empty, we don't have anything to stream */
1026         if (str->buf_len==0)
1027                 return True;
1028
1029         p = (char *)str->buffer;
1030
1031         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
1032
1033         ps->data_offset += (str->buf_len * sizeof(uint16));
1034
1035         return True;
1036 }
1037
1038 /******************************************************************
1039  Stream a "not" unicode string, length/buffer specified separately,
1040  in byte chars. String is in little-endian format.
1041  ********************************************************************/
1042
1043 BOOL prs_regval_buffer(BOOL charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
1044 {
1045         char *p;
1046         char *q = prs_mem_get(ps, buf->buf_len);
1047         if (q == NULL)
1048                 return False;
1049
1050         if (UNMARSHALLING(ps)) {
1051                 if (buf->buf_len > buf->buf_max_len) {
1052                         return False;
1053                 }
1054                 if ( buf->buf_max_len ) {
1055                         buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
1056                         if ( buf->buffer == NULL )
1057                                 return False;
1058                 }
1059         }
1060
1061         p = (char *)buf->buffer;
1062
1063         dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
1064         ps->data_offset += buf->buf_len;
1065
1066         return True;
1067 }
1068
1069 /******************************************************************
1070  Stream a string, length/buffer specified separately,
1071  in uint8 chars.
1072  ********************************************************************/
1073
1074 BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
1075 {
1076         unsigned int i;
1077         char *q = prs_mem_get(ps, str->str_str_len);
1078         if (q == NULL)
1079                 return False;
1080
1081         if (UNMARSHALLING(ps)) {
1082                 if (str->str_str_len > str->str_max_len) {
1083                         return False;
1084                 }
1085                 str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
1086                 if (str->buffer == NULL)
1087                         return False;
1088         }
1089
1090         if (UNMARSHALLING(ps)) {
1091                 for (i = 0; i < str->str_str_len; i++)
1092                         str->buffer[i] = CVAL(q,i);
1093         } else {
1094                 for (i = 0; i < str->str_str_len; i++)
1095                         SCVAL(q, i, str->buffer[i]);
1096         }
1097
1098         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1099         if (charmode)
1100                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
1101         else {
1102                 for (i = 0; i < str->str_str_len; i++)
1103                         DEBUG(5,("%02x ", str->buffer[i]));
1104         }
1105         DEBUG(5,("\n"));
1106
1107         ps->data_offset += str->str_str_len;
1108
1109         return True;
1110 }
1111
1112 /******************************************************************
1113  Stream a unicode string, length/buffer specified separately,
1114  in uint16 chars. The unicode string is already in little-endian format.
1115  ********************************************************************/
1116
1117 BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1118 {
1119         char *p;
1120         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1121         if (q == NULL)
1122                 return False;
1123
1124         /* If the string is empty, we don't have anything to stream */
1125         if (str->uni_str_len==0)
1126                 return True;
1127
1128         if (UNMARSHALLING(ps)) {
1129                 if (str->uni_str_len > str->uni_max_len) {
1130                         return False;
1131                 }
1132                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1133                 if (str->buffer == NULL)
1134                         return False;
1135         }
1136
1137         p = (char *)str->buffer;
1138
1139         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1140
1141         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1142
1143         return True;
1144 }
1145
1146 /******************************************************************
1147  Stream a unicode string, length/buffer specified separately,
1148  in uint16 chars. The unicode string is already in little-endian format.
1149  ********************************************************************/
1150
1151 BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1152 {
1153         char *p;
1154         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1155         if (q == NULL)
1156                 return False;
1157
1158         if (UNMARSHALLING(ps)) {
1159                 str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1160                 if (str->str.buffer == NULL)
1161                         return False;
1162         }
1163
1164         p = (char *)str->str.buffer;
1165
1166         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1167         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1168
1169         return True;
1170 }
1171
1172 /*******************************************************************
1173  Stream a unicode  null-terminated string. As the string is already
1174  in little-endian format then do it as a stream of bytes.
1175  ********************************************************************/
1176
1177 BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1178 {
1179         unsigned int len = 0;
1180         unsigned char *p = (unsigned char *)str->buffer;
1181         uint8 *start;
1182         char *q;
1183         uint32 max_len;
1184         uint16* ptr;
1185
1186         if (MARSHALLING(ps)) {
1187
1188                 for(len = 0; str->buffer[len] != 0; len++)
1189                         ;
1190
1191                 q = prs_mem_get(ps, (len+1)*2);
1192                 if (q == NULL)
1193                         return False;
1194
1195                 start = (uint8*)q;
1196
1197                 for(len = 0; str->buffer[len] != 0; len++) {
1198                         if(ps->bigendian_data) {
1199                                 /* swap bytes - p is little endian, q is big endian. */
1200                                 q[0] = (char)p[1];
1201                                 q[1] = (char)p[0];
1202                                 p += 2;
1203                                 q += 2;
1204                         }
1205                         else
1206                         {
1207                                 q[0] = (char)p[0];
1208                                 q[1] = (char)p[1];
1209                                 p += 2;
1210                                 q += 2;
1211                         }
1212                 }
1213
1214                 /*
1215                  * even if the string is 'empty' (only an \0 char)
1216                  * at this point the leading \0 hasn't been parsed.
1217                  * so parse it now
1218                  */
1219
1220                 q[0] = 0;
1221                 q[1] = 0;
1222                 q += 2;
1223
1224                 len++;
1225
1226                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1227                 print_asc(5, (unsigned char*)start, 2*len);
1228                 DEBUG(5, ("\n"));
1229         }
1230         else { /* unmarshalling */
1231
1232                 uint32 alloc_len = 0;
1233                 q = ps->data_p + prs_offset(ps);
1234
1235                 /*
1236                  * Work out how much space we need and talloc it.
1237                  */
1238                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1239
1240                 /* the test of the value of *ptr helps to catch the circumstance
1241                    where we have an emtpty (non-existent) string in the buffer */
1242                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1243                         /* do nothing */
1244                         ;
1245
1246                 if (alloc_len < max_len)
1247                         alloc_len += 1;
1248
1249                 /* should we allocate anything at all? */
1250                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1251                 if ((str->buffer == NULL) && (alloc_len > 0))
1252                         return False;
1253
1254                 p = (unsigned char *)str->buffer;
1255
1256                 len = 0;
1257                 /* the (len < alloc_len) test is to prevent us from overwriting
1258                    memory that is not ours...if we get that far, we have a non-null
1259                    terminated string in the buffer and have messed up somewhere */
1260                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1261                         if(ps->bigendian_data)
1262                         {
1263                                 /* swap bytes - q is big endian, p is little endian. */
1264                                 p[0] = (unsigned char)q[1];
1265                                 p[1] = (unsigned char)q[0];
1266                                 p += 2;
1267                                 q += 2;
1268                         } else {
1269
1270                                 p[0] = (unsigned char)q[0];
1271                                 p[1] = (unsigned char)q[1];
1272                                 p += 2;
1273                                 q += 2;
1274                         }
1275
1276                         len++;
1277                 }
1278                 if (len < alloc_len) {
1279                         /* NULL terminate the UNISTR */
1280                         str->buffer[len++] = '\0';
1281                 }
1282
1283                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1284                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1285                 DEBUG(5, ("\n"));
1286         }
1287
1288         /* set the offset in the prs_struct; 'len' points to the
1289            terminiating NULL in the UNISTR so we need to go one more
1290            uint16 */
1291         ps->data_offset += (len)*2;
1292
1293         return True;
1294 }
1295
1296
1297 /*******************************************************************
1298  Stream a null-terminated string.  len is strlen, and therefore does
1299  not include the null-termination character.
1300  ********************************************************************/
1301
1302 BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1303 {
1304         char *q;
1305         int i;
1306         int len;
1307
1308         if (UNMARSHALLING(ps))
1309                 len = strlen(&ps->data_p[ps->data_offset]);
1310         else
1311                 len = strlen(str);
1312
1313         len = MIN(len, (max_buf_size-1));
1314
1315         q = prs_mem_get(ps, len+1);
1316         if (q == NULL)
1317                 return False;
1318
1319         for(i = 0; i < len; i++) {
1320                 if (UNMARSHALLING(ps))
1321                         str[i] = q[i];
1322                 else
1323                         q[i] = str[i];
1324         }
1325
1326         /* The terminating null. */
1327         str[i] = '\0';
1328
1329         if (MARSHALLING(ps)) {
1330                 q[i] = '\0';
1331         }
1332
1333         ps->data_offset += len+1;
1334
1335         dump_data(5+depth, q, len);
1336
1337         return True;
1338 }
1339
1340 BOOL prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str)
1341 {
1342         size_t len;
1343         char *tmp_str;
1344
1345         if (UNMARSHALLING(ps)) {
1346                 len = strlen(&ps->data_p[ps->data_offset]);
1347         } else {
1348                 len = strlen(*str);
1349         }
1350
1351         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1352
1353         if (tmp_str == NULL) {
1354                 return False;
1355         }
1356
1357         if (MARSHALLING(ps)) {
1358                 strncpy(tmp_str, *str, len);
1359         }
1360
1361         if (!prs_string(name, ps, depth, tmp_str, len+1)) {
1362                 return False;
1363         }
1364
1365         *str = tmp_str;
1366         return True;
1367 }
1368
1369 /*******************************************************************
1370  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1371  uint16 should be stored, or gets the size if reading.
1372  ********************************************************************/
1373
1374 BOOL prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1375 {
1376         *offset = ps->data_offset;
1377         if (UNMARSHALLING(ps)) {
1378                 /* reading. */
1379                 return prs_uint16(name, ps, depth, data16);
1380         } else {
1381                 char *q = prs_mem_get(ps, sizeof(uint16));
1382                 if(q ==NULL)
1383                         return False;
1384                 ps->data_offset += sizeof(uint16);
1385         }
1386         return True;
1387 }
1388
1389 /*******************************************************************
1390  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1391  does nothing on reading, as that is already handled by ...._pre()
1392  ********************************************************************/
1393
1394 BOOL prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1395                                 uint32 ptr_uint16, uint32 start_offset)
1396 {
1397         if (MARSHALLING(ps)) {
1398                 /*
1399                  * Writing - temporarily move the offset pointer.
1400                  */
1401                 uint16 data_size = ps->data_offset - start_offset;
1402                 uint32 old_offset = ps->data_offset;
1403
1404                 ps->data_offset = ptr_uint16;
1405                 if(!prs_uint16(name, ps, depth, &data_size)) {
1406                         ps->data_offset = old_offset;
1407                         return False;
1408                 }
1409                 ps->data_offset = old_offset;
1410         } else {
1411                 ps->data_offset = start_offset + (uint32)(*data16);
1412         }
1413         return True;
1414 }
1415
1416 /*******************************************************************
1417  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1418  uint32 should be stored, or gets the size if reading.
1419  ********************************************************************/
1420
1421 BOOL prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1422 {
1423         *offset = ps->data_offset;
1424         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1425                 /* reading. */
1426                 return prs_uint32(name, ps, depth, data32);
1427         } else {
1428                 ps->data_offset += sizeof(uint32);
1429         }
1430         return True;
1431 }
1432
1433 /*******************************************************************
1434  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1435  does nothing on reading, as that is already handled by ...._pre()
1436  ********************************************************************/
1437
1438 BOOL prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1439                                 uint32 ptr_uint32, uint32 data_size)
1440 {
1441         if (MARSHALLING(ps)) {
1442                 /*
1443                  * Writing - temporarily move the offset pointer.
1444                  */
1445                 uint32 old_offset = ps->data_offset;
1446                 ps->data_offset = ptr_uint32;
1447                 if(!prs_uint32(name, ps, depth, &data_size)) {
1448                         ps->data_offset = old_offset;
1449                         return False;
1450                 }
1451                 ps->data_offset = old_offset;
1452         }
1453         return True;
1454 }
1455
1456 /* useful function to store a structure in rpc wire format */
1457 int tdb_prs_store(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
1458 {
1459     TDB_DATA kbuf, dbuf;
1460     kbuf.dptr = keystr;
1461     kbuf.dsize = strlen(keystr)+1;
1462     dbuf.dptr = ps->data_p;
1463     dbuf.dsize = prs_offset(ps);
1464     return tdb_trans_store(tdb, kbuf, dbuf, TDB_REPLACE);
1465 }
1466
1467 /* useful function to fetch a structure into rpc wire format */
1468 int tdb_prs_fetch(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
1469 {
1470     TDB_DATA kbuf, dbuf;
1471     kbuf.dptr = keystr;
1472     kbuf.dsize = strlen(keystr)+1;
1473
1474     prs_init(ps, 0, mem_ctx, UNMARSHALL);
1475
1476     dbuf = tdb_fetch(tdb, kbuf);
1477     if (!dbuf.dptr)
1478             return -1;
1479
1480     prs_give_memory(ps, dbuf.dptr, dbuf.dsize, True);
1481
1482     return 0;
1483 }
1484
1485 /*******************************************************************
1486  hash a stream.
1487  ********************************************************************/
1488
1489 BOOL prs_hash1(prs_struct *ps, uint32 offset, int len)
1490 {
1491         char *q;
1492
1493         q = ps->data_p;
1494         q = &q[offset];
1495
1496 #ifdef DEBUG_PASSWORD
1497         DEBUG(100, ("prs_hash1\n"));
1498         dump_data(100, ps->sess_key, 16);
1499         dump_data(100, q, len);
1500 #endif
1501         SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len);
1502
1503 #ifdef DEBUG_PASSWORD
1504         dump_data(100, q, len);
1505 #endif
1506
1507         return True;
1508 }
1509
1510 /*******************************************************************
1511  Create a digest over the entire packet (including the data), and
1512  MD5 it with the session key.
1513  ********************************************************************/
1514
1515 static void schannel_digest(struct schannel_auth_struct *a,
1516                           enum pipe_auth_level auth_level,
1517                           RPC_AUTH_SCHANNEL_CHK * verf,
1518                           char *data, size_t data_len,
1519                           uchar digest_final[16])
1520 {
1521         uchar whole_packet_digest[16];
1522         static uchar zeros[4];
1523         struct MD5Context ctx3;
1524
1525         /* verfiy the signature on the packet by MD5 over various bits */
1526         MD5Init(&ctx3);
1527         /* use our sequence number, which ensures the packet is not
1528            out of order */
1529         MD5Update(&ctx3, zeros, sizeof(zeros));
1530         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1531         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1532                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1533         }
1534         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1535         MD5Final(whole_packet_digest, &ctx3);
1536         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1537
1538         /* MD5 this result and the session key, to prove that
1539            only a valid client could had produced this */
1540         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1541 }
1542
1543 /*******************************************************************
1544  Calculate the key with which to encode the data payload
1545  ********************************************************************/
1546
1547 static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1548                                    RPC_AUTH_SCHANNEL_CHK *verf,
1549                                    uchar sealing_key[16])
1550 {
1551         static uchar zeros[4];
1552         uchar digest2[16];
1553         uchar sess_kf0[16];
1554         int i;
1555
1556         for (i = 0; i < sizeof(sess_kf0); i++) {
1557                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1558         }
1559
1560         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1561
1562         /* MD5 of sess_kf0 and 4 zero bytes */
1563         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1564         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1565
1566         /* MD5 of the above result, plus 8 bytes of sequence number */
1567         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1568         dump_data_pw("sealing_key:\n", sealing_key, 16);
1569 }
1570
1571 /*******************************************************************
1572  Encode or Decode the sequence number (which is symmetric)
1573  ********************************************************************/
1574
1575 static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1576                                      RPC_AUTH_SCHANNEL_CHK *verf)
1577 {
1578         static uchar zeros[4];
1579         uchar sequence_key[16];
1580         uchar digest1[16];
1581
1582         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1583         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1584
1585         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1586
1587         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1588
1589         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1590         SamOEMhash(verf->seq_num, sequence_key, 8);
1591         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1592 }
1593
1594 /*******************************************************************
1595 creates an RPC_AUTH_SCHANNEL_CHK structure.
1596 ********************************************************************/
1597
1598 static BOOL init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1599                               const uchar sig[8],
1600                               const uchar packet_digest[8],
1601                               const uchar seq_num[8], const uchar confounder[8])
1602 {
1603         if (chk == NULL)
1604                 return False;
1605
1606         memcpy(chk->sig, sig, sizeof(chk->sig));
1607         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1608         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1609         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1610
1611         return True;
1612 }
1613
1614 /*******************************************************************
1615  Encode a blob of data using the schannel alogrithm, also produceing
1616  a checksum over the original data.  We currently only support
1617  signing and sealing togeather - the signing-only code is close, but not
1618  quite compatible with what MS does.
1619  ********************************************************************/
1620
1621 void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1622                    enum schannel_direction direction,
1623                    RPC_AUTH_SCHANNEL_CHK * verf,
1624                    char *data, size_t data_len)
1625 {
1626         uchar digest_final[16];
1627         uchar confounder[8];
1628         uchar seq_num[8];
1629         static const uchar nullbytes[8] = { 0, };
1630
1631         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1632         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1633         const uchar *schannel_sig = NULL;
1634
1635         DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1636
1637         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1638                 schannel_sig = schannel_seal_sig;
1639         } else {
1640                 schannel_sig = schannel_sign_sig;
1641         }
1642
1643         /* fill the 'confounder' with random data */
1644         generate_random_buffer(confounder, sizeof(confounder));
1645
1646         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1647
1648         RSIVAL(seq_num, 0, a->seq_num);
1649
1650         switch (direction) {
1651         case SENDER_IS_INITIATOR:
1652                 SIVAL(seq_num, 4, 0x80);
1653                 break;
1654         case SENDER_IS_ACCEPTOR:
1655                 SIVAL(seq_num, 4, 0x0);
1656                 break;
1657         }
1658
1659         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1660
1661         init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1662                                  seq_num, confounder);
1663
1664         /* produce a digest of the packet to prove it's legit (before we seal it) */
1665         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1666         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1667
1668         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1669                 uchar sealing_key[16];
1670
1671                 /* get the key to encode the data with */
1672                 schannel_get_sealing_key(a, verf, sealing_key);
1673
1674                 /* encode the verification data */
1675                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1676                 SamOEMhash(verf->confounder, sealing_key, 8);
1677
1678                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1679
1680                 /* encode the packet payload */
1681                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1682                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1683                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1684         }
1685
1686         /* encode the sequence number (key based on packet digest) */
1687         /* needs to be done after the sealing, as the original version
1688            is used in the sealing stuff... */
1689         schannel_deal_with_seq_num(a, verf);
1690
1691         return;
1692 }
1693
1694 /*******************************************************************
1695  Decode a blob of data using the schannel alogrithm, also verifiying
1696  a checksum over the original data.  We currently can verify signed messages,
1697  as well as decode sealed messages
1698  ********************************************************************/
1699
1700 BOOL schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1701                    enum schannel_direction direction,
1702                    RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1703 {
1704         uchar digest_final[16];
1705
1706         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1707         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1708         const uchar *schannel_sig = NULL;
1709
1710         uchar seq_num[8];
1711
1712         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1713
1714         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1715                 schannel_sig = schannel_seal_sig;
1716         } else {
1717                 schannel_sig = schannel_sign_sig;
1718         }
1719
1720         /* Create the expected sequence number for comparison */
1721         RSIVAL(seq_num, 0, a->seq_num);
1722
1723         switch (direction) {
1724         case SENDER_IS_INITIATOR:
1725                 SIVAL(seq_num, 4, 0x80);
1726                 break;
1727         case SENDER_IS_ACCEPTOR:
1728                 SIVAL(seq_num, 4, 0x0);
1729                 break;
1730         }
1731
1732         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1733         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1734
1735         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1736
1737         /* extract the sequence number (key based on supplied packet digest) */
1738         /* needs to be done before the sealing, as the original version
1739            is used in the sealing stuff... */
1740         schannel_deal_with_seq_num(a, verf);
1741
1742         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1743                 /* don't even bother with the below if the sequence number is out */
1744                 /* The sequence number is MD5'ed with a key based on the whole-packet
1745                    digest, as supplied by the client.  We check that it's a valid
1746                    checksum after the decode, below
1747                 */
1748                 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1749                 dump_data(2, (const char*)verf->seq_num, sizeof(verf->seq_num));
1750                 DEBUG(2, ("should be:\n"));
1751                 dump_data(2, (const char*)seq_num, sizeof(seq_num));
1752
1753                 return False;
1754         }
1755
1756         if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1757                 /* Validate that the other end sent the expected header */
1758                 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1759                 dump_data(2, (const char*)verf->sig, sizeof(verf->sig));
1760                 DEBUG(2, ("should be:\n"));
1761                 dump_data(2, (const char*)schannel_sig, sizeof(schannel_sig));
1762                 return False;
1763         }
1764
1765         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1766                 uchar sealing_key[16];
1767
1768                 /* get the key to extract the data with */
1769                 schannel_get_sealing_key(a, verf, sealing_key);
1770
1771                 /* extract the verification data */
1772                 dump_data_pw("verf->confounder:\n", verf->confounder,
1773                              sizeof(verf->confounder));
1774                 SamOEMhash(verf->confounder, sealing_key, 8);
1775
1776                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1777                              sizeof(verf->confounder));
1778
1779                 /* extract the packet payload */
1780                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1781                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1782                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1783         }
1784
1785         /* digest includes 'data' after unsealing */
1786         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1787
1788         dump_data_pw("Calculated digest:\n", digest_final,
1789                      sizeof(digest_final));
1790         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1791                      sizeof(verf->packet_digest));
1792
1793         /* compare - if the client got the same result as us, then
1794            it must know the session key */
1795         return (memcmp(digest_final, verf->packet_digest,
1796                        sizeof(verf->packet_digest)) == 0);
1797 }
1798
1799 /*******************************************************************
1800 creates a new prs_struct containing a DATA_BLOB
1801 ********************************************************************/
1802 BOOL prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1803 {
1804         if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL ))
1805                 return False;
1806
1807
1808         if (!prs_copy_data_in(prs, (char *)blob->data, blob->length))
1809                 return False;
1810
1811         return True;
1812 }
1813
1814 /*******************************************************************
1815 return the contents of a prs_struct in a DATA_BLOB
1816 ********************************************************************/
1817 BOOL prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1818 {
1819         blob->length = prs_data_size(prs);
1820         blob->data = (uint8 *)talloc_zero_size(mem_ctx, blob->length);
1821
1822         /* set the pointer at the end of the buffer */
1823         prs_set_offset( prs, prs_data_size(prs) );
1824
1825         if (!prs_copy_all_data_out((char *)blob->data, prs))
1826                 return False;
1827
1828         return True;
1829 }