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 && count) {
 160                 /* We can't call the type-safe version here. */
 161                 ret = (char *)_talloc_zero_array_zeronull(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_size) {
 648                         if ( !(*data = PRS_ALLOC_MEM(ps, char, data_size)) )
 649                                 return False;
 650                 } else {
 651                         *data = NULL;
 652                 }
 653         }
 654
 655         return prs_fn(name, ps, depth, *data);
 656 }
 657
 658
 659 /*******************************************************************
 660  Stream a uint16.
 661  ********************************************************************/
 662
 663 BOOL prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
 664 {
 665         char *q = prs_mem_get(ps, sizeof(uint16));
 666         if (q == NULL)
 667                 return False;
 668
 669         if (UNMARSHALLING(ps)) {
 670                 if (ps->bigendian_data)
 671                         *data16 = RSVAL(q,0);
 672                 else
 673                         *data16 = SVAL(q,0);
 674         } else {
 675                 if (ps->bigendian_data)
 676                         RSSVAL(q,0,*data16);
 677                 else
 678                         SSVAL(q,0,*data16);
 679         }
 680
 681         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));
 682
 683         ps->data_offset += sizeof(uint16);
 684
 685         return True;
 686 }
 687
 688 /*******************************************************************
 689  Stream a uint32.
 690  ********************************************************************/
 691
 692 BOOL prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
 693 {
 694         char *q = prs_mem_get(ps, sizeof(uint32));
 695         if (q == NULL)
 696                 return False;
 697
 698         if (UNMARSHALLING(ps)) {
 699                 if (ps->bigendian_data)
 700                         *data32 = RIVAL(q,0);
 701                 else
 702                         *data32 = IVAL(q,0);
 703         } else {
 704                 if (ps->bigendian_data)
 705                         RSIVAL(q,0,*data32);
 706                 else
 707                         SIVAL(q,0,*data32);
 708         }
 709
 710         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 711
 712         ps->data_offset += sizeof(uint32);
 713
 714         return True;
 715 }
 716
 717 /*******************************************************************
 718  Stream an int32.
 719  ********************************************************************/
 720
 721 BOOL prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
 722 {
 723         char *q = prs_mem_get(ps, sizeof(int32));
 724         if (q == NULL)
 725                 return False;
 726
 727         if (UNMARSHALLING(ps)) {
 728                 if (ps->bigendian_data)
 729                         *data32 = RIVALS(q,0);
 730                 else
 731                         *data32 = IVALS(q,0);
 732         } else {
 733                 if (ps->bigendian_data)
 734                         RSIVALS(q,0,*data32);
 735                 else
 736                         SIVALS(q,0,*data32);
 737         }
 738
 739         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 740
 741         ps->data_offset += sizeof(int32);
 742
 743         return True;
 744 }
 745
 746 /*******************************************************************
 747  Stream a NTSTATUS
 748  ********************************************************************/
 749
 750 BOOL prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 751 {
 752         char *q = prs_mem_get(ps, sizeof(uint32));
 753         if (q == NULL)
 754                 return False;
 755
 756         if (UNMARSHALLING(ps)) {
 757                 if (ps->bigendian_data)
 758                         *status = NT_STATUS(RIVAL(q,0));
 759                 else
 760                         *status = NT_STATUS(IVAL(q,0));
 761         } else {
 762                 if (ps->bigendian_data)
 763                         RSIVAL(q,0,NT_STATUS_V(*status));
 764                 else
 765                         SIVAL(q,0,NT_STATUS_V(*status));
 766         }
 767
 768         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 769                  nt_errstr(*status)));
 770
 771         ps->data_offset += sizeof(uint32);
 772
 773         return True;
 774 }
 775
 776 /*******************************************************************
 777  Stream a DCE error code
 778  ********************************************************************/
 779
 780 BOOL prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 781 {
 782         char *q = prs_mem_get(ps, sizeof(uint32));
 783         if (q == NULL)
 784                 return False;
 785
 786         if (UNMARSHALLING(ps)) {
 787                 if (ps->bigendian_data)
 788                         *status = NT_STATUS(RIVAL(q,0));
 789                 else
 790                         *status = NT_STATUS(IVAL(q,0));
 791         } else {
 792                 if (ps->bigendian_data)
 793                         RSIVAL(q,0,NT_STATUS_V(*status));
 794                 else
 795                         SIVAL(q,0,NT_STATUS_V(*status));
 796         }
 797
 798         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 799                  dcerpc_errstr(NT_STATUS_V(*status))));
 800
 801         ps->data_offset += sizeof(uint32);
 802
 803         return True;
 804 }
 805
 806
 807 /*******************************************************************
 808  Stream a WERROR
 809  ********************************************************************/
 810
 811 BOOL prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 812 {
 813         char *q = prs_mem_get(ps, sizeof(uint32));
 814         if (q == NULL)
 815                 return False;
 816
 817         if (UNMARSHALLING(ps)) {
 818                 if (ps->bigendian_data)
 819                         *status = W_ERROR(RIVAL(q,0));
 820                 else
 821                         *status = W_ERROR(IVAL(q,0));
 822         } else {
 823                 if (ps->bigendian_data)
 824                         RSIVAL(q,0,W_ERROR_V(*status));
 825                 else
 826                         SIVAL(q,0,W_ERROR_V(*status));
 827         }
 828
 829         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 830                  dos_errstr(*status)));
 831
 832         ps->data_offset += sizeof(uint32);
 833
 834         return True;
 835 }
 836
 837
 838 /******************************************************************
 839  Stream an array of uint8s. Length is number of uint8s.
 840  ********************************************************************/
 841
 842 BOOL prs_uint8s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 843 {
 844         int i;
 845         char *q = prs_mem_get(ps, len);
 846         if (q == NULL)
 847                 return False;
 848
 849         if (UNMARSHALLING(ps)) {
 850                 for (i = 0; i < len; i++)
 851                         data8s[i] = CVAL(q,i);
 852         } else {
 853                 for (i = 0; i < len; i++)
 854                         SCVAL(q, i, data8s[i]);
 855         }
 856
 857         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
 858         if (charmode)
 859                 print_asc(5, (unsigned char*)data8s, len);
 860         else {
 861                 for (i = 0; i < len; i++)
 862                         DEBUG(5,("%02x ", data8s[i]));
 863         }
 864         DEBUG(5,("\n"));
 865
 866         ps->data_offset += len;
 867
 868         return True;
 869 }
 870
 871 /******************************************************************
 872  Stream an array of uint16s. Length is number of uint16s.
 873  ********************************************************************/
 874
 875 BOOL prs_uint16s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 876 {
 877         int i;
 878         char *q = prs_mem_get(ps, len * sizeof(uint16));
 879         if (q == NULL)
 880                 return False;
 881
 882         if (UNMARSHALLING(ps)) {
 883                 if (ps->bigendian_data) {
 884                         for (i = 0; i < len; i++)
 885                                 data16s[i] = RSVAL(q, 2*i);
 886                 } else {
 887                         for (i = 0; i < len; i++)
 888                                 data16s[i] = SVAL(q, 2*i);
 889                 }
 890         } else {
 891                 if (ps->bigendian_data) {
 892                         for (i = 0; i < len; i++)
 893                                 RSSVAL(q, 2*i, data16s[i]);
 894                 } else {
 895                         for (i = 0; i < len; i++)
 896                                 SSVAL(q, 2*i, data16s[i]);
 897                 }
 898         }
 899
 900         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 901         if (charmode)
 902                 print_asc(5, (unsigned char*)data16s, 2*len);
 903         else {
 904                 for (i = 0; i < len; i++)
 905                         DEBUG(5,("%04x ", data16s[i]));
 906         }
 907         DEBUG(5,("\n"));
 908
 909         ps->data_offset += (len * sizeof(uint16));
 910
 911         return True;
 912 }
 913
 914 /******************************************************************
 915  Start using a function for streaming unicode chars. If unmarshalling,
 916  output must be little-endian, if marshalling, input must be little-endian.
 917  ********************************************************************/
 918
 919 static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
 920                                                         char *in_buf, char *out_buf, int len)
 921 {
 922         int i;
 923
 924         if (UNMARSHALLING(ps)) {
 925                 if (ps->bigendian_data) {
 926                         for (i = 0; i < len; i++)
 927                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 928                 } else {
 929                         for (i = 0; i < len; i++)
 930                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 931                 }
 932         } else {
 933                 if (ps->bigendian_data) {
 934                         for (i = 0; i < len; i++)
 935                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 936                 } else {
 937                         for (i = 0; i < len; i++)
 938                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 939                 }
 940         }
 941
 942         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 943         if (charmode)
 944                 print_asc(5, (unsigned char*)out_buf, 2*len);
 945         else {
 946                 for (i = 0; i < len; i++)
 947                         DEBUG(5,("%04x ", out_buf[i]));
 948         }
 949         DEBUG(5,("\n"));
 950 }
 951
 952 /******************************************************************
 953  Stream a unistr. Always little endian.
 954  ********************************************************************/
 955
 956 BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 957 {
 958         char *q = prs_mem_get(ps, len * sizeof(uint16));
 959         if (q == NULL)
 960                 return False;
 961
 962         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 963         ps->data_offset += (len * sizeof(uint16));
 964
 965         return True;
 966 }
 967
 968 /******************************************************************
 969  Stream an array of uint32s. Length is number of uint32s.
 970  ********************************************************************/
 971
 972 BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 973 {
 974         int i;
 975         char *q = prs_mem_get(ps, len * sizeof(uint32));
 976         if (q == NULL)
 977                 return False;
 978
 979         if (UNMARSHALLING(ps)) {
 980                 if (ps->bigendian_data) {
 981                         for (i = 0; i < len; i++)
 982                                 data32s[i] = RIVAL(q, 4*i);
 983                 } else {
 984                         for (i = 0; i < len; i++)
 985                                 data32s[i] = IVAL(q, 4*i);
 986                 }
 987         } else {
 988                 if (ps->bigendian_data) {
 989                         for (i = 0; i < len; i++)
 990                                 RSIVAL(q, 4*i, data32s[i]);
 991                 } else {
 992                         for (i = 0; i < len; i++)
 993                                 SIVAL(q, 4*i, data32s[i]);
 994                 }
 995         }
 996
 997         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 998         if (charmode)
 999                 print_asc(5, (unsigned char*)data32s, 4*len);
1000         else {
1001                 for (i = 0; i < len; i++)
1002                         DEBUG(5,("%08x ", data32s[i]));
1003         }
1004         DEBUG(5,("\n"));
1005
1006         ps->data_offset += (len * sizeof(uint32));
1007
1008         return True;
1009 }
1010
1011 /******************************************************************
1012  Stream an array of unicode string, length/buffer specified separately,
1013  in uint16 chars. The unicode string is already in little-endian format.
1014  ********************************************************************/
1015
1016 BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
1017 {
1018         char *p;
1019         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
1020         if (q == NULL)
1021                 return False;
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         if (UNMARSHALLING(ps)) {
1028                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
1029                 if (str->buffer == NULL)
1030                         return False;
1031         }
1032
1033         p = (char *)str->buffer;
1034
1035         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
1036
1037         ps->data_offset += (str->buf_len * sizeof(uint16));
1038
1039         return True;
1040 }
1041
1042 /******************************************************************
1043  Stream a "not" unicode string, length/buffer specified separately,
1044  in byte chars. String is in little-endian format.
1045  ********************************************************************/
1046
1047 BOOL prs_regval_buffer(BOOL charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
1048 {
1049         char *p;
1050         char *q = prs_mem_get(ps, buf->buf_len);
1051         if (q == NULL)
1052                 return False;
1053
1054         if (UNMARSHALLING(ps)) {
1055                 if (buf->buf_len > buf->buf_max_len) {
1056                         return False;
1057                 }
1058                 if ( buf->buf_max_len ) {
1059                         buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
1060                         if ( buf->buffer == NULL )
1061                                 return False;
1062                 } else {
1063                         buf->buffer = NULL;
1064                 }
1065         }
1066
1067         p = (char *)buf->buffer;
1068
1069         dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
1070         ps->data_offset += buf->buf_len;
1071
1072         return True;
1073 }
1074
1075 /******************************************************************
1076  Stream a string, length/buffer specified separately,
1077  in uint8 chars.
1078  ********************************************************************/
1079
1080 BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
1081 {
1082         unsigned int i;
1083         char *q = prs_mem_get(ps, str->str_str_len);
1084         if (q == NULL)
1085                 return False;
1086
1087         if (UNMARSHALLING(ps)) {
1088                 if (str->str_str_len > str->str_max_len) {
1089                         return False;
1090                 }
1091                 if (str->str_max_len) {
1092                         str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
1093                         if (str->buffer == NULL)
1094                                 return False;
1095                 } else {
1096                         str->buffer = NULL;
1097                         /* Return early to ensure Coverity isn't confused. */
1098                         DEBUG(5,("%s%04x %s: \n", tab_depth(depth), ps->data_offset, name));
1099                         return True;
1100                 }
1101         }
1102
1103         if (UNMARSHALLING(ps)) {
1104                 for (i = 0; i < str->str_str_len; i++)
1105                         str->buffer[i] = CVAL(q,i);
1106         } else {
1107                 for (i = 0; i < str->str_str_len; i++)
1108                         SCVAL(q, i, str->buffer[i]);
1109         }
1110
1111         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1112         if (charmode)
1113                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
1114         else {
1115                 for (i = 0; i < str->str_str_len; i++)
1116                         DEBUG(5,("%02x ", str->buffer[i]));
1117         }
1118         DEBUG(5,("\n"));
1119
1120         ps->data_offset += str->str_str_len;
1121
1122         return True;
1123 }
1124
1125 /******************************************************************
1126  Stream a unicode string, length/buffer specified separately,
1127  in uint16 chars. The unicode string is already in little-endian format.
1128  ********************************************************************/
1129
1130 BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1131 {
1132         char *p;
1133         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1134         if (q == NULL)
1135                 return False;
1136
1137         /* If the string is empty, we don't have anything to stream */
1138         if (str->uni_str_len==0)
1139                 return True;
1140
1141         if (UNMARSHALLING(ps)) {
1142                 if (str->uni_str_len > str->uni_max_len) {
1143                         return False;
1144                 }
1145                 if (str->uni_max_len) {
1146                         str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1147                         if (str->buffer == NULL)
1148                                 return False;
1149                 } else {
1150                         str->buffer = NULL;
1151                 }
1152         }
1153
1154         p = (char *)str->buffer;
1155
1156         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1157
1158         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1159
1160         return True;
1161 }
1162
1163 /******************************************************************
1164  Stream a unicode string, length/buffer specified separately,
1165  in uint16 chars. The unicode string is already in little-endian format.
1166  ********************************************************************/
1167
1168 BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1169 {
1170         char *p;
1171         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1172         if (q == NULL)
1173                 return False;
1174
1175         if (UNMARSHALLING(ps)) {
1176                 if (str->uni_str_len) {
1177                         str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1178                         if (str->str.buffer == NULL)
1179                                 return False;
1180                 } else {
1181                         str->str.buffer = NULL;
1182                 }
1183         }
1184
1185         p = (char *)str->str.buffer;
1186
1187         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1188         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1189
1190         return True;
1191 }
1192
1193 /*******************************************************************
1194  Stream a unicode  null-terminated string. As the string is already
1195  in little-endian format then do it as a stream of bytes.
1196  ********************************************************************/
1197
1198 BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1199 {
1200         unsigned int len = 0;
1201         unsigned char *p = (unsigned char *)str->buffer;
1202         uint8 *start;
1203         char *q;
1204         uint32 max_len;
1205         uint16* ptr;
1206
1207         if (MARSHALLING(ps)) {
1208
1209                 for(len = 0; str->buffer[len] != 0; len++)
1210                         ;
1211
1212                 q = prs_mem_get(ps, (len+1)*2);
1213                 if (q == NULL)
1214                         return False;
1215
1216                 start = (uint8*)q;
1217
1218                 for(len = 0; str->buffer[len] != 0; len++) {
1219                         if(ps->bigendian_data) {
1220                                 /* swap bytes - p is little endian, q is big endian. */
1221                                 q[0] = (char)p[1];
1222                                 q[1] = (char)p[0];
1223                                 p += 2;
1224                                 q += 2;
1225                         }
1226                         else
1227                         {
1228                                 q[0] = (char)p[0];
1229                                 q[1] = (char)p[1];
1230                                 p += 2;
1231                                 q += 2;
1232                         }
1233                 }
1234
1235                 /*
1236                  * even if the string is 'empty' (only an \0 char)
1237                  * at this point the leading \0 hasn't been parsed.
1238                  * so parse it now
1239                  */
1240
1241                 q[0] = 0;
1242                 q[1] = 0;
1243                 q += 2;
1244
1245                 len++;
1246
1247                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1248                 print_asc(5, (unsigned char*)start, 2*len);
1249                 DEBUG(5, ("\n"));
1250         }
1251         else { /* unmarshalling */
1252
1253                 uint32 alloc_len = 0;
1254                 q = ps->data_p + prs_offset(ps);
1255
1256                 /*
1257                  * Work out how much space we need and talloc it.
1258                  */
1259                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1260
1261                 /* the test of the value of *ptr helps to catch the circumstance
1262                    where we have an emtpty (non-existent) string in the buffer */
1263                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1264                         /* do nothing */
1265                         ;
1266
1267                 if (alloc_len < max_len)
1268                         alloc_len += 1;
1269
1270                 /* should we allocate anything at all? */
1271                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1272                 if ((str->buffer == NULL) && (alloc_len > 0))
1273                         return False;
1274
1275                 p = (unsigned char *)str->buffer;
1276
1277                 len = 0;
1278                 /* the (len < alloc_len) test is to prevent us from overwriting
1279                    memory that is not ours...if we get that far, we have a non-null
1280                    terminated string in the buffer and have messed up somewhere */
1281                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1282                         if(ps->bigendian_data)
1283                         {
1284                                 /* swap bytes - q is big endian, p is little endian. */
1285                                 p[0] = (unsigned char)q[1];
1286                                 p[1] = (unsigned char)q[0];
1287                                 p += 2;
1288                                 q += 2;
1289                         } else {
1290
1291                                 p[0] = (unsigned char)q[0];
1292                                 p[1] = (unsigned char)q[1];
1293                                 p += 2;
1294                                 q += 2;
1295                         }
1296
1297                         len++;
1298                 }
1299                 if (len < alloc_len) {
1300                         /* NULL terminate the UNISTR */
1301                         str->buffer[len++] = '\0';
1302                 }
1303
1304                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1305                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1306                 DEBUG(5, ("\n"));
1307         }
1308
1309         /* set the offset in the prs_struct; 'len' points to the
1310            terminiating NULL in the UNISTR so we need to go one more
1311            uint16 */
1312         ps->data_offset += (len)*2;
1313
1314         return True;
1315 }
1316
1317
1318 /*******************************************************************
1319  Stream a null-terminated string.  len is strlen, and therefore does
1320  not include the null-termination character.
1321  ********************************************************************/
1322
1323 BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1324 {
1325         char *q;
1326         int i;
1327         int len;
1328
1329         if (UNMARSHALLING(ps))
1330                 len = strlen(&ps->data_p[ps->data_offset]);
1331         else
1332                 len = strlen(str);
1333
1334         len = MIN(len, (max_buf_size-1));
1335
1336         q = prs_mem_get(ps, len+1);
1337         if (q == NULL)
1338                 return False;
1339
1340         for(i = 0; i < len; i++) {
1341                 if (UNMARSHALLING(ps))
1342                         str[i] = q[i];
1343                 else
1344                         q[i] = str[i];
1345         }
1346
1347         /* The terminating null. */
1348         str[i] = '\0';
1349
1350         if (MARSHALLING(ps)) {
1351                 q[i] = '\0';
1352         }
1353
1354         ps->data_offset += len+1;
1355
1356         dump_data(5+depth, q, len);
1357
1358         return True;
1359 }
1360
1361 BOOL prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str)
1362 {
1363         size_t len;
1364         char *tmp_str;
1365
1366         if (UNMARSHALLING(ps)) {
1367                 len = strlen(&ps->data_p[ps->data_offset]);
1368         } else {
1369                 len = strlen(*str);
1370         }
1371
1372         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1373
1374         if (tmp_str == NULL) {
1375                 return False;
1376         }
1377
1378         if (MARSHALLING(ps)) {
1379                 strncpy(tmp_str, *str, len);
1380         }
1381
1382         if (!prs_string(name, ps, depth, tmp_str, len+1)) {
1383                 return False;
1384         }
1385
1386         *str = tmp_str;
1387         return True;
1388 }
1389
1390 /*******************************************************************
1391  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1392  uint16 should be stored, or gets the size if reading.
1393  ********************************************************************/
1394
1395 BOOL prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1396 {
1397         *offset = ps->data_offset;
1398         if (UNMARSHALLING(ps)) {
1399                 /* reading. */
1400                 return prs_uint16(name, ps, depth, data16);
1401         } else {
1402                 char *q = prs_mem_get(ps, sizeof(uint16));
1403                 if(q ==NULL)
1404                         return False;
1405                 ps->data_offset += sizeof(uint16);
1406         }
1407         return True;
1408 }
1409
1410 /*******************************************************************
1411  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1412  does nothing on reading, as that is already handled by ...._pre()
1413  ********************************************************************/
1414
1415 BOOL prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1416                                 uint32 ptr_uint16, uint32 start_offset)
1417 {
1418         if (MARSHALLING(ps)) {
1419                 /*
1420                  * Writing - temporarily move the offset pointer.
1421                  */
1422                 uint16 data_size = ps->data_offset - start_offset;
1423                 uint32 old_offset = ps->data_offset;
1424
1425                 ps->data_offset = ptr_uint16;
1426                 if(!prs_uint16(name, ps, depth, &data_size)) {
1427                         ps->data_offset = old_offset;
1428                         return False;
1429                 }
1430                 ps->data_offset = old_offset;
1431         } else {
1432                 ps->data_offset = start_offset + (uint32)(*data16);
1433         }
1434         return True;
1435 }
1436
1437 /*******************************************************************
1438  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1439  uint32 should be stored, or gets the size if reading.
1440  ********************************************************************/
1441
1442 BOOL prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1443 {
1444         *offset = ps->data_offset;
1445         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1446                 /* reading. */
1447                 return prs_uint32(name, ps, depth, data32);
1448         } else {
1449                 ps->data_offset += sizeof(uint32);
1450         }
1451         return True;
1452 }
1453
1454 /*******************************************************************
1455  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1456  does nothing on reading, as that is already handled by ...._pre()
1457  ********************************************************************/
1458
1459 BOOL prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1460                                 uint32 ptr_uint32, uint32 data_size)
1461 {
1462         if (MARSHALLING(ps)) {
1463                 /*
1464                  * Writing - temporarily move the offset pointer.
1465                  */
1466                 uint32 old_offset = ps->data_offset;
1467                 ps->data_offset = ptr_uint32;
1468                 if(!prs_uint32(name, ps, depth, &data_size)) {
1469                         ps->data_offset = old_offset;
1470                         return False;
1471                 }
1472                 ps->data_offset = old_offset;
1473         }
1474         return True;
1475 }
1476
1477 /* useful function to store a structure in rpc wire format */
1478 int tdb_prs_store(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
1479 {
1480         TDB_DATA kbuf, dbuf;
1481         kbuf.dptr = keystr;
1482         kbuf.dsize = strlen(keystr)+1;
1483         dbuf.dptr = ps->data_p;
1484         dbuf.dsize = prs_offset(ps);
1485         return tdb_trans_store(tdb, kbuf, dbuf, TDB_REPLACE);
1486 }
1487
1488 /* useful function to fetch a structure into rpc wire format */
1489 int tdb_prs_fetch(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
1490 {
1491         TDB_DATA kbuf, dbuf;
1492         kbuf.dptr = keystr;
1493         kbuf.dsize = strlen(keystr)+1;
1494
1495         prs_init(ps, 0, mem_ctx, UNMARSHALL);
1496
1497         dbuf = tdb_fetch(tdb, kbuf);
1498         if (!dbuf.dptr)
1499                 return -1;
1500
1501         prs_give_memory(ps, dbuf.dptr, dbuf.dsize, True);
1502
1503         return 0;
1504 }
1505
1506 /*******************************************************************
1507  hash a stream.
1508  ********************************************************************/
1509
1510 BOOL prs_hash1(prs_struct *ps, uint32 offset, int len)
1511 {
1512         char *q;
1513
1514         q = ps->data_p;
1515         q = &q[offset];
1516
1517 #ifdef DEBUG_PASSWORD
1518         DEBUG(100, ("prs_hash1\n"));
1519         dump_data(100, ps->sess_key, 16);
1520         dump_data(100, q, len);
1521 #endif
1522         SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len);
1523
1524 #ifdef DEBUG_PASSWORD
1525         dump_data(100, q, len);
1526 #endif
1527
1528         return True;
1529 }
1530
1531 /*******************************************************************
1532  Create a digest over the entire packet (including the data), and
1533  MD5 it with the session key.
1534  ********************************************************************/
1535
1536 static void schannel_digest(struct schannel_auth_struct *a,
1537                           enum pipe_auth_level auth_level,
1538                           RPC_AUTH_SCHANNEL_CHK * verf,
1539                           char *data, size_t data_len,
1540                           uchar digest_final[16])
1541 {
1542         uchar whole_packet_digest[16];
1543         static uchar zeros[4];
1544         struct MD5Context ctx3;
1545
1546         /* verfiy the signature on the packet by MD5 over various bits */
1547         MD5Init(&ctx3);
1548         /* use our sequence number, which ensures the packet is not
1549            out of order */
1550         MD5Update(&ctx3, zeros, sizeof(zeros));
1551         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1552         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1553                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1554         }
1555         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1556         MD5Final(whole_packet_digest, &ctx3);
1557         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1558
1559         /* MD5 this result and the session key, to prove that
1560            only a valid client could had produced this */
1561         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1562 }
1563
1564 /*******************************************************************
1565  Calculate the key with which to encode the data payload
1566  ********************************************************************/
1567
1568 static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1569                                    RPC_AUTH_SCHANNEL_CHK *verf,
1570                                    uchar sealing_key[16])
1571 {
1572         static uchar zeros[4];
1573         uchar digest2[16];
1574         uchar sess_kf0[16];
1575         int i;
1576
1577         for (i = 0; i < sizeof(sess_kf0); i++) {
1578                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1579         }
1580
1581         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1582
1583         /* MD5 of sess_kf0 and 4 zero bytes */
1584         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1585         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1586
1587         /* MD5 of the above result, plus 8 bytes of sequence number */
1588         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1589         dump_data_pw("sealing_key:\n", sealing_key, 16);
1590 }
1591
1592 /*******************************************************************
1593  Encode or Decode the sequence number (which is symmetric)
1594  ********************************************************************/
1595
1596 static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1597                                      RPC_AUTH_SCHANNEL_CHK *verf)
1598 {
1599         static uchar zeros[4];
1600         uchar sequence_key[16];
1601         uchar digest1[16];
1602
1603         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1604         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1605
1606         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1607
1608         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1609
1610         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1611         SamOEMhash(verf->seq_num, sequence_key, 8);
1612         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1613 }
1614
1615 /*******************************************************************
1616 creates an RPC_AUTH_SCHANNEL_CHK structure.
1617 ********************************************************************/
1618
1619 static BOOL init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1620                               const uchar sig[8],
1621                               const uchar packet_digest[8],
1622                               const uchar seq_num[8], const uchar confounder[8])
1623 {
1624         if (chk == NULL)
1625                 return False;
1626
1627         memcpy(chk->sig, sig, sizeof(chk->sig));
1628         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1629         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1630         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1631
1632         return True;
1633 }
1634
1635 /*******************************************************************
1636  Encode a blob of data using the schannel alogrithm, also produceing
1637  a checksum over the original data.  We currently only support
1638  signing and sealing togeather - the signing-only code is close, but not
1639  quite compatible with what MS does.
1640  ********************************************************************/
1641
1642 void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1643                    enum schannel_direction direction,
1644                    RPC_AUTH_SCHANNEL_CHK * verf,
1645                    char *data, size_t data_len)
1646 {
1647         uchar digest_final[16];
1648         uchar confounder[8];
1649         uchar seq_num[8];
1650         static const uchar nullbytes[8] = { 0, };
1651
1652         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1653         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1654         const uchar *schannel_sig = NULL;
1655
1656         DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1657
1658         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1659                 schannel_sig = schannel_seal_sig;
1660         } else {
1661                 schannel_sig = schannel_sign_sig;
1662         }
1663
1664         /* fill the 'confounder' with random data */
1665         generate_random_buffer(confounder, sizeof(confounder));
1666
1667         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1668
1669         RSIVAL(seq_num, 0, a->seq_num);
1670
1671         switch (direction) {
1672         case SENDER_IS_INITIATOR:
1673                 SIVAL(seq_num, 4, 0x80);
1674                 break;
1675         case SENDER_IS_ACCEPTOR:
1676                 SIVAL(seq_num, 4, 0x0);
1677                 break;
1678         }
1679
1680         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1681
1682         init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1683                                  seq_num, confounder);
1684
1685         /* produce a digest of the packet to prove it's legit (before we seal it) */
1686         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1687         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1688
1689         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1690                 uchar sealing_key[16];
1691
1692                 /* get the key to encode the data with */
1693                 schannel_get_sealing_key(a, verf, sealing_key);
1694
1695                 /* encode the verification data */
1696                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1697                 SamOEMhash(verf->confounder, sealing_key, 8);
1698
1699                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1700
1701                 /* encode the packet payload */
1702                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1703                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1704                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1705         }
1706
1707         /* encode the sequence number (key based on packet digest) */
1708         /* needs to be done after the sealing, as the original version
1709            is used in the sealing stuff... */
1710         schannel_deal_with_seq_num(a, verf);
1711
1712         return;
1713 }
1714
1715 /*******************************************************************
1716  Decode a blob of data using the schannel alogrithm, also verifiying
1717  a checksum over the original data.  We currently can verify signed messages,
1718  as well as decode sealed messages
1719  ********************************************************************/
1720
1721 BOOL schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1722                    enum schannel_direction direction,
1723                    RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1724 {
1725         uchar digest_final[16];
1726
1727         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1728         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1729         const uchar *schannel_sig = NULL;
1730
1731         uchar seq_num[8];
1732
1733         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1734
1735         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1736                 schannel_sig = schannel_seal_sig;
1737         } else {
1738                 schannel_sig = schannel_sign_sig;
1739         }
1740
1741         /* Create the expected sequence number for comparison */
1742         RSIVAL(seq_num, 0, a->seq_num);
1743
1744         switch (direction) {
1745         case SENDER_IS_INITIATOR:
1746                 SIVAL(seq_num, 4, 0x80);
1747                 break;
1748         case SENDER_IS_ACCEPTOR:
1749                 SIVAL(seq_num, 4, 0x0);
1750                 break;
1751         }
1752
1753         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1754         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1755
1756         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1757
1758         /* extract the sequence number (key based on supplied packet digest) */
1759         /* needs to be done before the sealing, as the original version
1760            is used in the sealing stuff... */
1761         schannel_deal_with_seq_num(a, verf);
1762
1763         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1764                 /* don't even bother with the below if the sequence number is out */
1765                 /* The sequence number is MD5'ed with a key based on the whole-packet
1766                    digest, as supplied by the client.  We check that it's a valid
1767                    checksum after the decode, below
1768                 */
1769                 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1770                 dump_data(2, (const char*)verf->seq_num, sizeof(verf->seq_num));
1771                 DEBUG(2, ("should be:\n"));
1772                 dump_data(2, (const char*)seq_num, sizeof(seq_num));
1773
1774                 return False;
1775         }
1776
1777         if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1778                 /* Validate that the other end sent the expected header */
1779                 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1780                 dump_data(2, (const char*)verf->sig, sizeof(verf->sig));
1781                 DEBUG(2, ("should be:\n"));
1782                 dump_data(2, (const char*)schannel_sig, sizeof(schannel_sig));
1783                 return False;
1784         }
1785
1786         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1787                 uchar sealing_key[16];
1788
1789                 /* get the key to extract the data with */
1790                 schannel_get_sealing_key(a, verf, sealing_key);
1791
1792                 /* extract the verification data */
1793                 dump_data_pw("verf->confounder:\n", verf->confounder,
1794                              sizeof(verf->confounder));
1795                 SamOEMhash(verf->confounder, sealing_key, 8);
1796
1797                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1798                              sizeof(verf->confounder));
1799
1800                 /* extract the packet payload */
1801                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1802                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1803                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1804         }
1805
1806         /* digest includes 'data' after unsealing */
1807         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1808
1809         dump_data_pw("Calculated digest:\n", digest_final,
1810                      sizeof(digest_final));
1811         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1812                      sizeof(verf->packet_digest));
1813
1814         /* compare - if the client got the same result as us, then
1815            it must know the session key */
1816         return (memcmp(digest_final, verf->packet_digest,
1817                        sizeof(verf->packet_digest)) == 0);
1818 }
1819
1820 /*******************************************************************
1821 creates a new prs_struct containing a DATA_BLOB
1822 ********************************************************************/
1823 BOOL prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1824 {
1825         if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL ))
1826                 return False;
1827
1828
1829         if (!prs_copy_data_in(prs, (char *)blob->data, blob->length))
1830                 return False;
1831
1832         return True;
1833 }
1834
1835 /*******************************************************************
1836 return the contents of a prs_struct in a DATA_BLOB
1837 ********************************************************************/
1838 BOOL prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1839 {
1840         blob->length = prs_data_size(prs);
1841         blob->data = (uint8 *)TALLOC_ZERO_SIZE(mem_ctx, blob->length);
1842
1843         /* set the pointer at the end of the buffer */
1844         prs_set_offset( prs, prs_data_size(prs) );
1845
1846         if (!prs_copy_all_data_out((char *)blob->data, prs))
1847                 return False;
1848
1849         return True;
1850 }