source3/rpc_parse/parse_prs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba memory buffer functions
   4    Copyright (C) Andrew Tridgell              1992-1997
   5    Copyright (C) Luke Kenneth Casson Leighton 1996-1997
   6    Copyright (C) Jeremy Allison               1999
   7    Copyright (C) Andrew Bartlett              2003.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_RPC_PARSE
  27
  28 /**
  29  * Dump a prs to a file: from the current location through to the end.
  30  **/
  31 void prs_dump(const char *name, int v, prs_struct *ps)
  32 {
  33         prs_dump_region(name, v, ps, ps->data_offset, ps->buffer_size);
  34 }
  35
  36 /**
  37  * Dump from the start of the prs to the current location.
  38  **/
  39 void prs_dump_before(const char *name, int v, prs_struct *ps)
  40 {
  41         prs_dump_region(name, v, ps, 0, ps->data_offset);
  42 }
  43
  44 /**
  45  * Dump everything from the start of the prs up to the current location.
  46  **/
  47 void prs_dump_region(const char *name, int v, prs_struct *ps,
  48                      int from_off, int to_off)
  49 {
  50         int fd, i;
  51         char *fname = NULL;
  52         ssize_t sz;
  53         if (DEBUGLEVEL < 50) return;
  54         for (i=1;i<100;i++) {
  55                 if (v != -1) {
  56                         if (asprintf(&fname,"/tmp/%s_%d.%d.prs", name, v, i) < 0) {
  57                                 return;
  58                         }
  59                 } else {
  60                         if (asprintf(&fname,"/tmp/%s.%d.prs", name, i) < 0) {
  61                                 return;
  62                         }
  63                 }
  64                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
  65                 if (fd != -1 || errno != EEXIST) break;
  66         }
  67         if (fd != -1) {
  68                 sz = write(fd, ps->data_p + from_off, to_off - from_off);
  69                 i = close(fd);
  70                 if ( (sz != to_off-from_off) || (i != 0) ) {
  71                         DEBUG(0,("Error writing/closing %s: %ld!=%ld %d\n", fname, (unsigned long)sz, (unsigned long)to_off-from_off, i ));
  72                 } else {
  73                         DEBUG(0,("created %s\n", fname));
  74                 }
  75         }
  76         SAFE_FREE(fname);
  77 }
  78
  79 /*******************************************************************
  80  Debug output for parsing info
  81
  82  XXXX side-effect of this function is to increase the debug depth XXXX.
  83
  84 ********************************************************************/
  85
  86 void prs_debug(prs_struct *ps, int depth, const char *desc, const char *fn_name)
  87 {
  88         DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(5+depth,depth), ps->data_offset, fn_name, desc));
  89 }
  90
  91 /**
  92  * Initialise an expandable parse structure.
  93  *
  94  * @param size Initial buffer size.  If >0, a new buffer will be
  95  * created with malloc().
  96  *
  97  * @return False if allocation fails, otherwise True.
  98  **/
  99
 100 bool prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, bool io)
 101 {
 102         ZERO_STRUCTP(ps);
 103         ps->io = io;
 104         ps->bigendian_data = RPC_LITTLE_ENDIAN;
 105         ps->align = RPC_PARSE_ALIGN;
 106         ps->is_dynamic = False;
 107         ps->data_offset = 0;
 108         ps->buffer_size = 0;
 109         ps->data_p = NULL;
 110         ps->mem_ctx = ctx;
 111
 112         if (size != 0) {
 113                 ps->buffer_size = size;
 114                 if((ps->data_p = (char *)SMB_MALLOC((size_t)size)) == NULL) {
 115                         DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
 116                         return False;
 117                 }
 118                 memset(ps->data_p, '\0', (size_t)size);
 119                 ps->is_dynamic = True; /* We own this memory. */
 120         } else if (MARSHALLING(ps)) {
 121                 /* If size is zero and we're marshalling we should allocate memory on demand. */
 122                 ps->is_dynamic = True;
 123         }
 124
 125         return True;
 126 }
 127
 128 /*******************************************************************
 129  Delete the memory in a parse structure - if we own it.
 130
 131  NOTE: Contrary to the somewhat confusing naming, this function is not
 132        intended for freeing memory allocated by prs_alloc_mem().  That memory
 133        is attached to the talloc context given by ps->mem_ctx.
 134  ********************************************************************/
 135
 136 void prs_mem_free(prs_struct *ps)
 137 {
 138         if(ps->is_dynamic)
 139                 SAFE_FREE(ps->data_p);
 140         ps->is_dynamic = False;
 141         ps->buffer_size = 0;
 142         ps->data_offset = 0;
 143 }
 144
 145 /*******************************************************************
 146  Clear the memory in a parse structure.
 147  ********************************************************************/
 148
 149 void prs_mem_clear(prs_struct *ps)
 150 {
 151         if (ps->buffer_size)
 152                 memset(ps->data_p, '\0', (size_t)ps->buffer_size);
 153 }
 154
 155 /*******************************************************************
 156  Allocate memory when unmarshalling... Always zero clears.
 157  ********************************************************************/
 158
 159 #if defined(PARANOID_MALLOC_CHECKER)
 160 char *prs_alloc_mem_(prs_struct *ps, size_t size, unsigned int count)
 161 #else
 162 char *prs_alloc_mem(prs_struct *ps, size_t size, unsigned int count)
 163 #endif
 164 {
 165         char *ret = NULL;
 166
 167         if (size && count) {
 168                 /* We can't call the type-safe version here. */
 169                 ret = (char *)_talloc_zero_array(ps->mem_ctx, size, count,
 170                                                  "parse_prs");
 171         }
 172         return ret;
 173 }
 174
 175 /*******************************************************************
 176  Return the current talloc context we're using.
 177  ********************************************************************/
 178
 179 TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
 180 {
 181         return ps->mem_ctx;
 182 }
 183
 184 /*******************************************************************
 185  Hand some already allocated memory to a prs_struct.
 186  ********************************************************************/
 187
 188 void prs_give_memory(prs_struct *ps, char *buf, uint32 size, bool is_dynamic)
 189 {
 190         ps->is_dynamic = is_dynamic;
 191         ps->data_p = buf;
 192         ps->buffer_size = size;
 193 }
 194
 195 /*******************************************************************
 196  Take some memory back from a prs_struct.
 197  ********************************************************************/
 198
 199 char *prs_take_memory(prs_struct *ps, uint32 *psize)
 200 {
 201         char *ret = ps->data_p;
 202         if(psize)
 203                 *psize = ps->buffer_size;
 204         ps->is_dynamic = False;
 205         prs_mem_free(ps);
 206         return ret;
 207 }
 208
 209 /*******************************************************************
 210  Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
 211  ********************************************************************/
 212
 213 bool prs_set_buffer_size(prs_struct *ps, uint32 newsize)
 214 {
 215         if (newsize > ps->buffer_size)
 216                 return prs_force_grow(ps, newsize - ps->buffer_size);
 217
 218         if (newsize < ps->buffer_size) {
 219                 ps->buffer_size = newsize;
 220
 221                 /* newsize == 0 acts as a free and set pointer to NULL */
 222                 if (newsize == 0) {
 223                         SAFE_FREE(ps->data_p);
 224                 } else {
 225                         ps->data_p = (char *)SMB_REALLOC(ps->data_p, newsize);
 226
 227                         if (ps->data_p == NULL) {
 228                                 DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
 229                                         (unsigned int)newsize));
 230                                 DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
 231                                 return False;
 232                         }
 233                 }
 234         }
 235
 236         return True;
 237 }
 238
 239 /*******************************************************************
 240  Attempt, if needed, to grow a data buffer.
 241  Also depends on the data stream mode (io).
 242  ********************************************************************/
 243
 244 bool prs_grow(prs_struct *ps, uint32 extra_space)
 245 {
 246         uint32 new_size;
 247
 248         ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
 249
 250         if(ps->data_offset + extra_space <= ps->buffer_size)
 251                 return True;
 252
 253         /*
 254          * We cannot grow the buffer if we're not reading
 255          * into the prs_struct, or if we don't own the memory.
 256          */
 257
 258         if(UNMARSHALLING(ps) || !ps->is_dynamic) {
 259                 DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 260                                 (unsigned int)extra_space));
 261                 return False;
 262         }
 263
 264         /*
 265          * Decide how much extra space we really need.
 266          */
 267
 268         extra_space -= (ps->buffer_size - ps->data_offset);
 269         if(ps->buffer_size == 0) {
 270
 271                 /*
 272                  * Start with 128 bytes (arbitrary value), enough for small rpc
 273                  * requests
 274                  */
 275                 new_size = MAX(128, extra_space);
 276
 277                 if((ps->data_p = (char *)SMB_MALLOC(new_size)) == NULL) {
 278                         DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
 279                         return False;
 280                 }
 281                 memset(ps->data_p, '\0', (size_t)new_size );
 282         } else {
 283                 /*
 284                  * If the current buffer size is bigger than the space needed,
 285                  * just double it, else add extra_space. Always keep 64 bytes
 286                  * more, so that after we added a large blob we don't have to
 287                  * realloc immediately again.
 288                  */
 289                 new_size = MAX(ps->buffer_size*2,
 290                                ps->buffer_size + extra_space + 64);
 291
 292                 if ((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 293                         DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
 294                                 (unsigned int)new_size));
 295                         return False;
 296                 }
 297
 298                 memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 299         }
 300         ps->buffer_size = new_size;
 301
 302         return True;
 303 }
 304
 305 /*******************************************************************
 306  Attempt to force a data buffer to grow by len bytes.
 307  This is only used when appending more data onto a prs_struct
 308  when reading an rpc reply, before unmarshalling it.
 309  ********************************************************************/
 310
 311 bool prs_force_grow(prs_struct *ps, uint32 extra_space)
 312 {
 313         uint32 new_size = ps->buffer_size + extra_space;
 314
 315         if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
 316                 DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 317                                 (unsigned int)extra_space));
 318                 return False;
 319         }
 320
 321         if((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 322                 DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
 323                         (unsigned int)new_size));
 324                 return False;
 325         }
 326
 327         memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 328
 329         ps->buffer_size = new_size;
 330
 331         return True;
 332 }
 333
 334 /*******************************************************************
 335  Get the data pointer (external interface).
 336 ********************************************************************/
 337
 338 char *prs_data_p(prs_struct *ps)
 339 {
 340         return ps->data_p;
 341 }
 342
 343 /*******************************************************************
 344  Get the current data size (external interface).
 345  ********************************************************************/
 346
 347 uint32 prs_data_size(prs_struct *ps)
 348 {
 349         return ps->buffer_size;
 350 }
 351
 352 /*******************************************************************
 353  Fetch the current offset (external interface).
 354  ********************************************************************/
 355
 356 uint32 prs_offset(prs_struct *ps)
 357 {
 358         return ps->data_offset;
 359 }
 360
 361 /*******************************************************************
 362  Set the current offset (external interface).
 363  ********************************************************************/
 364
 365 bool prs_set_offset(prs_struct *ps, uint32 offset)
 366 {
 367         if ((offset > ps->data_offset)
 368             && !prs_grow(ps, offset - ps->data_offset)) {
 369                 return False;
 370         }
 371
 372         ps->data_offset = offset;
 373         return True;
 374 }
 375
 376 /*******************************************************************
 377  Append the data from one parse_struct into another.
 378  ********************************************************************/
 379
 380 bool prs_append_prs_data(prs_struct *dst, prs_struct *src)
 381 {
 382         if (prs_offset(src) == 0)
 383                 return True;
 384
 385         if(!prs_grow(dst, prs_offset(src)))
 386                 return False;
 387
 388         memcpy(&dst->data_p[dst->data_offset], src->data_p, (size_t)prs_offset(src));
 389         dst->data_offset += prs_offset(src);
 390
 391         return True;
 392 }
 393
 394 /*******************************************************************
 395  Append some data from one parse_struct into another.
 396  ********************************************************************/
 397
 398 bool prs_append_some_data(prs_struct *dst, void *src_base, uint32_t start,
 399                           uint32_t len)
 400 {
 401         if (len == 0) {
 402                 return true;
 403         }
 404
 405         if(!prs_grow(dst, len)) {
 406                 return false;
 407         }
 408
 409         memcpy(&dst->data_p[dst->data_offset], ((char *)src_base) + start, (size_t)len);
 410         dst->data_offset += len;
 411         return true;
 412 }
 413
 414 bool prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start,
 415                               uint32 len)
 416 {
 417         return prs_append_some_data(dst, src->data_p, start, len);
 418 }
 419
 420 /*******************************************************************
 421  Append the data from a buffer into a parse_struct.
 422  ********************************************************************/
 423
 424 bool prs_copy_data_in(prs_struct *dst, const char *src, uint32 len)
 425 {
 426         if (len == 0)
 427                 return True;
 428
 429         if(!prs_grow(dst, len))
 430                 return False;
 431
 432         memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
 433         dst->data_offset += len;
 434
 435         return True;
 436 }
 437
 438 /*******************************************************************
 439  Copy some data from a parse_struct into a buffer.
 440  ********************************************************************/
 441
 442 bool prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
 443 {
 444         if (len == 0)
 445                 return True;
 446
 447         if(!prs_mem_get(src, len))
 448                 return False;
 449
 450         memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
 451         src->data_offset += len;
 452
 453         return True;
 454 }
 455
 456 /*******************************************************************
 457  Copy all the data from a parse_struct into a buffer.
 458  ********************************************************************/
 459
 460 bool prs_copy_all_data_out(char *dst, prs_struct *src)
 461 {
 462         uint32 len = prs_offset(src);
 463
 464         if (!len)
 465                 return True;
 466
 467         prs_set_offset(src, 0);
 468         return prs_copy_data_out(dst, src, len);
 469 }
 470
 471 /*******************************************************************
 472  Set the data as X-endian (external interface).
 473  ********************************************************************/
 474
 475 void prs_set_endian_data(prs_struct *ps, bool endian)
 476 {
 477         ps->bigendian_data = endian;
 478 }
 479
 480 /*******************************************************************
 481  Align a the data_len to a multiple of align bytes - filling with
 482  zeros.
 483  ********************************************************************/
 484
 485 bool prs_align(prs_struct *ps)
 486 {
 487         uint32 mod = ps->data_offset & (ps->align-1);
 488
 489         if (ps->align != 0 && mod != 0) {
 490                 uint32 extra_space = (ps->align - mod);
 491                 if(!prs_grow(ps, extra_space))
 492                         return False;
 493                 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
 494                 ps->data_offset += extra_space;
 495         }
 496
 497         return True;
 498 }
 499
 500 /******************************************************************
 501  Align on a 2 byte boundary
 502  *****************************************************************/
 503
 504 bool prs_align_uint16(prs_struct *ps)
 505 {
 506         bool ret;
 507         uint8 old_align = ps->align;
 508
 509         ps->align = 2;
 510         ret = prs_align(ps);
 511         ps->align = old_align;
 512
 513         return ret;
 514 }
 515
 516 /******************************************************************
 517  Align on a 8 byte boundary
 518  *****************************************************************/
 519
 520 bool prs_align_uint64(prs_struct *ps)
 521 {
 522         bool ret;
 523         uint8 old_align = ps->align;
 524
 525         ps->align = 8;
 526         ret = prs_align(ps);
 527         ps->align = old_align;
 528
 529         return ret;
 530 }
 531
 532 /******************************************************************
 533  Align on a specific byte boundary
 534  *****************************************************************/
 535
 536 bool prs_align_custom(prs_struct *ps, uint8 boundary)
 537 {
 538         bool ret;
 539         uint8 old_align = ps->align;
 540
 541         ps->align = boundary;
 542         ret = prs_align(ps);
 543         ps->align = old_align;
 544
 545         return ret;
 546 }
 547
 548
 549
 550 /*******************************************************************
 551  Align only if required (for the unistr2 string mainly)
 552  ********************************************************************/
 553
 554 bool prs_align_needed(prs_struct *ps, uint32 needed)
 555 {
 556         if (needed==0)
 557                 return True;
 558         else
 559                 return prs_align(ps);
 560 }
 561
 562 /*******************************************************************
 563  Ensure we can read/write to a given offset.
 564  ********************************************************************/
 565
 566 char *prs_mem_get(prs_struct *ps, uint32 extra_size)
 567 {
 568         if(UNMARSHALLING(ps)) {
 569                 /*
 570                  * If reading, ensure that we can read the requested size item.
 571                  */
 572                 if (ps->data_offset + extra_size > ps->buffer_size) {
 573                         DEBUG(0,("prs_mem_get: reading data of size %u would overrun "
 574                                 "buffer by %u bytes.\n",
 575                                 (unsigned int)extra_size,
 576                                 (unsigned int)(ps->data_offset + extra_size - ps->buffer_size) ));
 577                         return NULL;
 578                 }
 579         } else {
 580                 /*
 581                  * Writing - grow the buffer if needed.
 582                  */
 583                 if(!prs_grow(ps, extra_size))
 584                         return NULL;
 585         }
 586         return &ps->data_p[ps->data_offset];
 587 }
 588
 589 /*******************************************************************
 590  Change the struct type.
 591  ********************************************************************/
 592
 593 void prs_switch_type(prs_struct *ps, bool io)
 594 {
 595         if ((ps->io ^ io) == True)
 596                 ps->io=io;
 597 }
 598
 599 /*******************************************************************
 600  Force a prs_struct to be dynamic even when it's size is 0.
 601  ********************************************************************/
 602
 603 void prs_force_dynamic(prs_struct *ps)
 604 {
 605         ps->is_dynamic=True;
 606 }
 607
 608 /*******************************************************************
 609  Associate a session key with a parse struct.
 610  ********************************************************************/
 611
 612 void prs_set_session_key(prs_struct *ps, const char sess_key[16])
 613 {
 614         ps->sess_key = sess_key;
 615 }
 616
 617 /*******************************************************************
 618  Stream a uint8.
 619  ********************************************************************/
 620
 621 bool prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
 622 {
 623         char *q = prs_mem_get(ps, 1);
 624         if (q == NULL)
 625                 return False;
 626
 627         if (UNMARSHALLING(ps))
 628                 *data8 = CVAL(q,0);
 629         else
 630                 SCVAL(q,0,*data8);
 631
 632         DEBUGADD(5,("%s%04x %s: %02x\n", tab_depth(5,depth), ps->data_offset, name, *data8));
 633
 634         ps->data_offset += 1;
 635
 636         return True;
 637 }
 638
 639 /*******************************************************************
 640  Stream a uint16* (allocate memory if unmarshalling)
 641  ********************************************************************/
 642
 643 bool prs_pointer( const char *name, prs_struct *ps, int depth,
 644                  void *dta, size_t data_size,
 645                  bool (*prs_fn)(const char*, prs_struct*, int, void*) )
 646 {
 647         void ** data = (void **)dta;
 648         uint32 data_p;
 649
 650         /* output f000baaa to stream if the pointer is non-zero. */
 651
 652         data_p = *data ? 0xf000baaa : 0;
 653
 654         if ( !prs_uint32("ptr", ps, depth, &data_p ))
 655                 return False;
 656
 657         /* we're done if there is no data */
 658
 659         if ( !data_p )
 660                 return True;
 661
 662         if (UNMARSHALLING(ps)) {
 663                 if (data_size) {
 664                         if ( !(*data = PRS_ALLOC_MEM(ps, char, data_size)) )
 665                                 return False;
 666                 } else {
 667                         *data = NULL;
 668                 }
 669         }
 670
 671         return prs_fn(name, ps, depth, *data);
 672 }
 673
 674
 675 /*******************************************************************
 676  Stream a uint16.
 677  ********************************************************************/
 678
 679 bool prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
 680 {
 681         char *q = prs_mem_get(ps, sizeof(uint16));
 682         if (q == NULL)
 683                 return False;
 684
 685         if (UNMARSHALLING(ps)) {
 686                 if (ps->bigendian_data)
 687                         *data16 = RSVAL(q,0);
 688                 else
 689                         *data16 = SVAL(q,0);
 690         } else {
 691                 if (ps->bigendian_data)
 692                         RSSVAL(q,0,*data16);
 693                 else
 694                         SSVAL(q,0,*data16);
 695         }
 696
 697         DEBUGADD(5,("%s%04x %s: %04x\n", tab_depth(5,depth), ps->data_offset, name, *data16));
 698
 699         ps->data_offset += sizeof(uint16);
 700
 701         return True;
 702 }
 703
 704 /*******************************************************************
 705  Stream a uint32.
 706  ********************************************************************/
 707
 708 bool prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
 709 {
 710         char *q = prs_mem_get(ps, sizeof(uint32));
 711         if (q == NULL)
 712                 return False;
 713
 714         if (UNMARSHALLING(ps)) {
 715                 if (ps->bigendian_data)
 716                         *data32 = RIVAL(q,0);
 717                 else
 718                         *data32 = IVAL(q,0);
 719         } else {
 720                 if (ps->bigendian_data)
 721                         RSIVAL(q,0,*data32);
 722                 else
 723                         SIVAL(q,0,*data32);
 724         }
 725
 726         DEBUGADD(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
 727
 728         ps->data_offset += sizeof(uint32);
 729
 730         return True;
 731 }
 732
 733 /*******************************************************************
 734  Stream an int32.
 735  ********************************************************************/
 736
 737 bool prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
 738 {
 739         char *q = prs_mem_get(ps, sizeof(int32));
 740         if (q == NULL)
 741                 return False;
 742
 743         if (UNMARSHALLING(ps)) {
 744                 if (ps->bigendian_data)
 745                         *data32 = RIVALS(q,0);
 746                 else
 747                         *data32 = IVALS(q,0);
 748         } else {
 749                 if (ps->bigendian_data)
 750                         RSIVALS(q,0,*data32);
 751                 else
 752                         SIVALS(q,0,*data32);
 753         }
 754
 755         DEBUGADD(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
 756
 757         ps->data_offset += sizeof(int32);
 758
 759         return True;
 760 }
 761
 762 /*******************************************************************
 763  Stream a NTSTATUS
 764  ********************************************************************/
 765
 766 bool prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 767 {
 768         char *q = prs_mem_get(ps, sizeof(uint32));
 769         if (q == NULL)
 770                 return False;
 771
 772         if (UNMARSHALLING(ps)) {
 773                 if (ps->bigendian_data)
 774                         *status = NT_STATUS(RIVAL(q,0));
 775                 else
 776                         *status = NT_STATUS(IVAL(q,0));
 777         } else {
 778                 if (ps->bigendian_data)
 779                         RSIVAL(q,0,NT_STATUS_V(*status));
 780                 else
 781                         SIVAL(q,0,NT_STATUS_V(*status));
 782         }
 783
 784         DEBUGADD(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
 785                  nt_errstr(*status)));
 786
 787         ps->data_offset += sizeof(uint32);
 788
 789         return True;
 790 }
 791
 792 /*******************************************************************
 793  Stream a DCE error code
 794  ********************************************************************/
 795
 796 bool prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 797 {
 798         char *q = prs_mem_get(ps, sizeof(uint32));
 799         if (q == NULL)
 800                 return False;
 801
 802         if (UNMARSHALLING(ps)) {
 803                 if (ps->bigendian_data)
 804                         *status = NT_STATUS(RIVAL(q,0));
 805                 else
 806                         *status = NT_STATUS(IVAL(q,0));
 807         } else {
 808                 if (ps->bigendian_data)
 809                         RSIVAL(q,0,NT_STATUS_V(*status));
 810                 else
 811                         SIVAL(q,0,NT_STATUS_V(*status));
 812         }
 813
 814         DEBUGADD(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
 815                  dcerpc_errstr(debug_ctx(), NT_STATUS_V(*status))));
 816
 817         ps->data_offset += sizeof(uint32);
 818
 819         return True;
 820 }
 821
 822
 823 /*******************************************************************
 824  Stream a WERROR
 825  ********************************************************************/
 826
 827 bool prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 828 {
 829         char *q = prs_mem_get(ps, sizeof(uint32));
 830         if (q == NULL)
 831                 return False;
 832
 833         if (UNMARSHALLING(ps)) {
 834                 if (ps->bigendian_data)
 835                         *status = W_ERROR(RIVAL(q,0));
 836                 else
 837                         *status = W_ERROR(IVAL(q,0));
 838         } else {
 839                 if (ps->bigendian_data)
 840                         RSIVAL(q,0,W_ERROR_V(*status));
 841                 else
 842                         SIVAL(q,0,W_ERROR_V(*status));
 843         }
 844
 845         DEBUGADD(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
 846                  win_errstr(*status)));
 847
 848         ps->data_offset += sizeof(uint32);
 849
 850         return True;
 851 }
 852
 853
 854 /******************************************************************
 855  Stream an array of uint8s. Length is number of uint8s.
 856  ********************************************************************/
 857
 858 bool prs_uint8s(bool charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 859 {
 860         int i;
 861         char *q = prs_mem_get(ps, len);
 862         if (q == NULL)
 863                 return False;
 864
 865         if (UNMARSHALLING(ps)) {
 866                 for (i = 0; i < len; i++)
 867                         data8s[i] = CVAL(q,i);
 868         } else {
 869                 for (i = 0; i < len; i++)
 870                         SCVAL(q, i, data8s[i]);
 871         }
 872
 873         DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset ,name));
 874         if (charmode)
 875                 print_asc(5, (unsigned char*)data8s, len);
 876         else {
 877                 for (i = 0; i < len; i++)
 878                         DEBUGADD(5,("%02x ", data8s[i]));
 879         }
 880         DEBUGADD(5,("\n"));
 881
 882         ps->data_offset += len;
 883
 884         return True;
 885 }
 886
 887 /******************************************************************
 888  Stream an array of uint16s. Length is number of uint16s.
 889  ********************************************************************/
 890
 891 bool prs_uint16s(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 892 {
 893         int i;
 894         char *q = prs_mem_get(ps, len * sizeof(uint16));
 895         if (q == NULL)
 896                 return False;
 897
 898         if (UNMARSHALLING(ps)) {
 899                 if (ps->bigendian_data) {
 900                         for (i = 0; i < len; i++)
 901                                 data16s[i] = RSVAL(q, 2*i);
 902                 } else {
 903                         for (i = 0; i < len; i++)
 904                                 data16s[i] = SVAL(q, 2*i);
 905                 }
 906         } else {
 907                 if (ps->bigendian_data) {
 908                         for (i = 0; i < len; i++)
 909                                 RSSVAL(q, 2*i, data16s[i]);
 910                 } else {
 911                         for (i = 0; i < len; i++)
 912                                 SSVAL(q, 2*i, data16s[i]);
 913                 }
 914         }
 915
 916         DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
 917         if (charmode)
 918                 print_asc(5, (unsigned char*)data16s, 2*len);
 919         else {
 920                 for (i = 0; i < len; i++)
 921                         DEBUGADD(5,("%04x ", data16s[i]));
 922         }
 923         DEBUGADD(5,("\n"));
 924
 925         ps->data_offset += (len * sizeof(uint16));
 926
 927         return True;
 928 }
 929
 930 /******************************************************************
 931  Start using a function for streaming unicode chars. If unmarshalling,
 932  output must be little-endian, if marshalling, input must be little-endian.
 933  ********************************************************************/
 934
 935 static void dbg_rw_punival(bool charmode, const char *name, int depth, prs_struct *ps,
 936                                                         char *in_buf, char *out_buf, int len)
 937 {
 938         int i;
 939
 940         if (UNMARSHALLING(ps)) {
 941                 if (ps->bigendian_data) {
 942                         for (i = 0; i < len; i++)
 943                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 944                 } else {
 945                         for (i = 0; i < len; i++)
 946                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 947                 }
 948         } else {
 949                 if (ps->bigendian_data) {
 950                         for (i = 0; i < len; i++)
 951                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 952                 } else {
 953                         for (i = 0; i < len; i++)
 954                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 955                 }
 956         }
 957
 958         DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
 959         if (charmode)
 960                 print_asc(5, (unsigned char*)out_buf, 2*len);
 961         else {
 962                 for (i = 0; i < len; i++)
 963                         DEBUGADD(5,("%04x ", out_buf[i]));
 964         }
 965         DEBUGADD(5,("\n"));
 966 }
 967
 968 /******************************************************************
 969  Stream a unistr. Always little endian.
 970  ********************************************************************/
 971
 972 bool prs_uint16uni(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 973 {
 974         char *q = prs_mem_get(ps, len * sizeof(uint16));
 975         if (q == NULL)
 976                 return False;
 977
 978         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 979         ps->data_offset += (len * sizeof(uint16));
 980
 981         return True;
 982 }
 983
 984 /******************************************************************
 985  Stream an array of uint32s. Length is number of uint32s.
 986  ********************************************************************/
 987
 988 bool prs_uint32s(bool charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 989 {
 990         int i;
 991         char *q = prs_mem_get(ps, len * sizeof(uint32));
 992         if (q == NULL)
 993                 return False;
 994
 995         if (UNMARSHALLING(ps)) {
 996                 if (ps->bigendian_data) {
 997                         for (i = 0; i < len; i++)
 998                                 data32s[i] = RIVAL(q, 4*i);
 999                 } else {
1000                         for (i = 0; i < len; i++)
1001                                 data32s[i] = IVAL(q, 4*i);
1002                 }
1003         } else {
1004                 if (ps->bigendian_data) {
1005                         for (i = 0; i < len; i++)
1006                                 RSIVAL(q, 4*i, data32s[i]);
1007                 } else {
1008                         for (i = 0; i < len; i++)
1009                                 SIVAL(q, 4*i, data32s[i]);
1010                 }
1011         }
1012
1013         DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1014         if (charmode)
1015                 print_asc(5, (unsigned char*)data32s, 4*len);
1016         else {
1017                 for (i = 0; i < len; i++)
1018                         DEBUGADD(5,("%08x ", data32s[i]));
1019         }
1020         DEBUGADD(5,("\n"));
1021
1022         ps->data_offset += (len * sizeof(uint32));
1023
1024         return True;
1025 }
1026
1027 /******************************************************************
1028  Stream an array of unicode string, length/buffer specified separately,
1029  in uint16 chars. The unicode string is already in little-endian format.
1030  ********************************************************************/
1031
1032 bool prs_buffer5(bool charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
1033 {
1034         char *p;
1035         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
1036         if (q == NULL)
1037                 return False;
1038
1039         /* If the string is empty, we don't have anything to stream */
1040         if (str->buf_len==0)
1041                 return True;
1042
1043         if (UNMARSHALLING(ps)) {
1044                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
1045                 if (str->buffer == NULL)
1046                         return False;
1047         }
1048
1049         p = (char *)str->buffer;
1050
1051         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
1052
1053         ps->data_offset += (str->buf_len * sizeof(uint16));
1054
1055         return True;
1056 }
1057
1058 /******************************************************************
1059  Stream a unicode string, length/buffer specified separately,
1060  in uint16 chars. The unicode string is already in little-endian format.
1061  ********************************************************************/
1062
1063 bool prs_unistr2(bool charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1064 {
1065         char *p;
1066         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1067         if (q == NULL)
1068                 return False;
1069
1070         /* If the string is empty, we don't have anything to stream */
1071         if (str->uni_str_len==0)
1072                 return True;
1073
1074         if (UNMARSHALLING(ps)) {
1075                 if (str->uni_str_len > str->uni_max_len) {
1076                         return False;
1077                 }
1078                 if (str->uni_max_len) {
1079                         str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1080                         if (str->buffer == NULL)
1081                                 return False;
1082                 } else {
1083                         str->buffer = NULL;
1084                 }
1085         }
1086
1087         p = (char *)str->buffer;
1088
1089         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1090
1091         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1092
1093         return True;
1094 }
1095
1096 /******************************************************************
1097  Stream a unicode string, length/buffer specified separately,
1098  in uint16 chars. The unicode string is already in little-endian format.
1099  ********************************************************************/
1100
1101 bool prs_unistr3(bool charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1102 {
1103         char *p;
1104         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1105         if (q == NULL)
1106                 return False;
1107
1108         if (UNMARSHALLING(ps)) {
1109                 if (str->uni_str_len) {
1110                         str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1111                         if (str->str.buffer == NULL)
1112                                 return False;
1113                 } else {
1114                         str->str.buffer = NULL;
1115                 }
1116         }
1117
1118         p = (char *)str->str.buffer;
1119
1120         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1121         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1122
1123         return True;
1124 }
1125
1126 /*******************************************************************
1127  Stream a unicode  null-terminated string. As the string is already
1128  in little-endian format then do it as a stream of bytes.
1129  ********************************************************************/
1130
1131 bool prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1132 {
1133         unsigned int len = 0;
1134         unsigned char *p = (unsigned char *)str->buffer;
1135         uint8 *start;
1136         char *q;
1137         uint32 max_len;
1138         uint16* ptr;
1139
1140         if (MARSHALLING(ps)) {
1141
1142                 for(len = 0; str->buffer[len] != 0; len++)
1143                         ;
1144
1145                 q = prs_mem_get(ps, (len+1)*2);
1146                 if (q == NULL)
1147                         return False;
1148
1149                 start = (uint8*)q;
1150
1151                 for(len = 0; str->buffer[len] != 0; len++) {
1152                         if(ps->bigendian_data) {
1153                                 /* swap bytes - p is little endian, q is big endian. */
1154                                 q[0] = (char)p[1];
1155                                 q[1] = (char)p[0];
1156                                 p += 2;
1157                                 q += 2;
1158                         }
1159                         else
1160                         {
1161                                 q[0] = (char)p[0];
1162                                 q[1] = (char)p[1];
1163                                 p += 2;
1164                                 q += 2;
1165                         }
1166                 }
1167
1168                 /*
1169                  * even if the string is 'empty' (only an \0 char)
1170                  * at this point the leading \0 hasn't been parsed.
1171                  * so parse it now
1172                  */
1173
1174                 q[0] = 0;
1175                 q[1] = 0;
1176                 q += 2;
1177
1178                 len++;
1179
1180                 DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1181                 print_asc(5, (unsigned char*)start, 2*len);
1182                 DEBUGADD(5, ("\n"));
1183         }
1184         else { /* unmarshalling */
1185
1186                 uint32 alloc_len = 0;
1187                 q = ps->data_p + prs_offset(ps);
1188
1189                 /*
1190                  * Work out how much space we need and talloc it.
1191                  */
1192                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1193
1194                 /* the test of the value of *ptr helps to catch the circumstance
1195                    where we have an emtpty (non-existent) string in the buffer */
1196                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1197                         /* do nothing */
1198                         ;
1199
1200                 if (alloc_len < max_len)
1201                         alloc_len += 1;
1202
1203                 /* should we allocate anything at all? */
1204                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1205                 if ((str->buffer == NULL) && (alloc_len > 0))
1206                         return False;
1207
1208                 p = (unsigned char *)str->buffer;
1209
1210                 len = 0;
1211                 /* the (len < alloc_len) test is to prevent us from overwriting
1212                    memory that is not ours...if we get that far, we have a non-null
1213                    terminated string in the buffer and have messed up somewhere */
1214                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1215                         if(ps->bigendian_data)
1216                         {
1217                                 /* swap bytes - q is big endian, p is little endian. */
1218                                 p[0] = (unsigned char)q[1];
1219                                 p[1] = (unsigned char)q[0];
1220                                 p += 2;
1221                                 q += 2;
1222                         } else {
1223
1224                                 p[0] = (unsigned char)q[0];
1225                                 p[1] = (unsigned char)q[1];
1226                                 p += 2;
1227                                 q += 2;
1228                         }
1229
1230                         len++;
1231                 }
1232                 if (len < alloc_len) {
1233                         /* NULL terminate the UNISTR */
1234                         str->buffer[len++] = '\0';
1235                 }
1236
1237                 DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1238                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1239                 DEBUGADD(5, ("\n"));
1240         }
1241
1242         /* set the offset in the prs_struct; 'len' points to the
1243            terminiating NULL in the UNISTR so we need to go one more
1244            uint16 */
1245         ps->data_offset += (len)*2;
1246
1247         return True;
1248 }
1249
1250
1251 /*******************************************************************
1252  Stream a null-terminated string.  len is strlen, and therefore does
1253  not include the null-termination character.
1254  ********************************************************************/
1255
1256 bool prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1257 {
1258         char *q;
1259         int i;
1260         int len;
1261
1262         if (UNMARSHALLING(ps))
1263                 len = strlen(&ps->data_p[ps->data_offset]);
1264         else
1265                 len = strlen(str);
1266
1267         len = MIN(len, (max_buf_size-1));
1268
1269         q = prs_mem_get(ps, len+1);
1270         if (q == NULL)
1271                 return False;
1272
1273         for(i = 0; i < len; i++) {
1274                 if (UNMARSHALLING(ps))
1275                         str[i] = q[i];
1276                 else
1277                         q[i] = str[i];
1278         }
1279
1280         /* The terminating null. */
1281         str[i] = '\0';
1282
1283         if (MARSHALLING(ps)) {
1284                 q[i] = '\0';
1285         }
1286
1287         ps->data_offset += len+1;
1288
1289         dump_data(5+depth, (uint8 *)q, len);
1290
1291         return True;
1292 }
1293
1294 bool prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str)
1295 {
1296         size_t len;
1297         char *tmp_str;
1298
1299         if (UNMARSHALLING(ps)) {
1300                 len = strlen(&ps->data_p[ps->data_offset]);
1301         } else {
1302                 len = strlen(*str);
1303         }
1304
1305         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1306
1307         if (tmp_str == NULL) {
1308                 return False;
1309         }
1310
1311         if (MARSHALLING(ps)) {
1312                 strncpy(tmp_str, *str, len);
1313         }
1314
1315         if (!prs_string(name, ps, depth, tmp_str, len+1)) {
1316                 return False;
1317         }
1318
1319         *str = tmp_str;
1320         return True;
1321 }
1322
1323 /*******************************************************************
1324  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1325  uint16 should be stored, or gets the size if reading.
1326  ********************************************************************/
1327
1328 bool prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1329 {
1330         *offset = ps->data_offset;
1331         if (UNMARSHALLING(ps)) {
1332                 /* reading. */
1333                 return prs_uint16(name, ps, depth, data16);
1334         } else {
1335                 char *q = prs_mem_get(ps, sizeof(uint16));
1336                 if(q ==NULL)
1337                         return False;
1338                 ps->data_offset += sizeof(uint16);
1339         }
1340         return True;
1341 }
1342
1343 /*******************************************************************
1344  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1345  does nothing on reading, as that is already handled by ...._pre()
1346  ********************************************************************/
1347
1348 bool prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1349                                 uint32 ptr_uint16, uint32 start_offset)
1350 {
1351         if (MARSHALLING(ps)) {
1352                 /*
1353                  * Writing - temporarily move the offset pointer.
1354                  */
1355                 uint16 data_size = ps->data_offset - start_offset;
1356                 uint32 old_offset = ps->data_offset;
1357
1358                 ps->data_offset = ptr_uint16;
1359                 if(!prs_uint16(name, ps, depth, &data_size)) {
1360                         ps->data_offset = old_offset;
1361                         return False;
1362                 }
1363                 ps->data_offset = old_offset;
1364         } else {
1365                 ps->data_offset = start_offset + (uint32)(*data16);
1366         }
1367         return True;
1368 }
1369
1370 /*******************************************************************
1371  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1372  uint32 should be stored, or gets the size if reading.
1373  ********************************************************************/
1374
1375 bool prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1376 {
1377         *offset = ps->data_offset;
1378         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1379                 /* reading. */
1380                 return prs_uint32(name, ps, depth, data32);
1381         } else {
1382                 ps->data_offset += sizeof(uint32);
1383         }
1384         return True;
1385 }
1386
1387 /*******************************************************************
1388  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1389  does nothing on reading, as that is already handled by ...._pre()
1390  ********************************************************************/
1391
1392 bool prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1393                                 uint32 ptr_uint32, uint32 data_size)
1394 {
1395         if (MARSHALLING(ps)) {
1396                 /*
1397                  * Writing - temporarily move the offset pointer.
1398                  */
1399                 uint32 old_offset = ps->data_offset;
1400                 ps->data_offset = ptr_uint32;
1401                 if(!prs_uint32(name, ps, depth, &data_size)) {
1402                         ps->data_offset = old_offset;
1403                         return False;
1404                 }
1405                 ps->data_offset = old_offset;
1406         }
1407         return True;
1408 }
1409
1410 /* useful function to store a structure in rpc wire format */
1411 int tdb_prs_store(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps)
1412 {
1413         TDB_DATA dbuf;
1414         dbuf.dptr = (uint8 *)ps->data_p;
1415         dbuf.dsize = prs_offset(ps);
1416         return tdb_trans_store(tdb, kbuf, dbuf, TDB_REPLACE);
1417 }
1418
1419 /* useful function to fetch a structure into rpc wire format */
1420 int tdb_prs_fetch(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps, TALLOC_CTX *mem_ctx)
1421 {
1422         TDB_DATA dbuf;
1423
1424         prs_init_empty(ps, mem_ctx, UNMARSHALL);
1425
1426         dbuf = tdb_fetch(tdb, kbuf);
1427         if (!dbuf.dptr)
1428                 return -1;
1429
1430         prs_give_memory(ps, (char *)dbuf.dptr, dbuf.dsize, True);
1431
1432         return 0;
1433 }
1434
1435 /*******************************************************************
1436  hash a stream.
1437  ********************************************************************/
1438
1439 bool prs_hash1(prs_struct *ps, uint32 offset, int len)
1440 {
1441         char *q;
1442
1443         q = ps->data_p;
1444         q = &q[offset];
1445
1446 #ifdef DEBUG_PASSWORD
1447         DEBUG(100, ("prs_hash1\n"));
1448         dump_data(100, (uint8 *)ps->sess_key, 16);
1449         dump_data(100, (uint8 *)q, len);
1450 #endif
1451         SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len);
1452
1453 #ifdef DEBUG_PASSWORD
1454         dump_data(100, (uint8 *)q, len);
1455 #endif
1456
1457         return True;
1458 }
1459
1460 /*******************************************************************
1461  Create a digest over the entire packet (including the data), and
1462  MD5 it with the session key.
1463  ********************************************************************/
1464
1465 static void schannel_digest(struct schannel_auth_struct *a,
1466                           enum pipe_auth_level auth_level,
1467                           RPC_AUTH_SCHANNEL_CHK * verf,
1468                           char *data, size_t data_len,
1469                           uchar digest_final[16])
1470 {
1471         uchar whole_packet_digest[16];
1472         uchar zeros[4];
1473         struct MD5Context ctx3;
1474
1475         ZERO_STRUCT(zeros);
1476
1477         /* verfiy the signature on the packet by MD5 over various bits */
1478         MD5Init(&ctx3);
1479         /* use our sequence number, which ensures the packet is not
1480            out of order */
1481         MD5Update(&ctx3, zeros, sizeof(zeros));
1482         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1483         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1484                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1485         }
1486         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1487         MD5Final(whole_packet_digest, &ctx3);
1488         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1489
1490         /* MD5 this result and the session key, to prove that
1491            only a valid client could had produced this */
1492         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1493 }
1494
1495 /*******************************************************************
1496  Calculate the key with which to encode the data payload
1497  ********************************************************************/
1498
1499 static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1500                                    RPC_AUTH_SCHANNEL_CHK *verf,
1501                                    uchar sealing_key[16])
1502 {
1503         uchar zeros[4];
1504         uchar digest2[16];
1505         uchar sess_kf0[16];
1506         int i;
1507
1508         ZERO_STRUCT(zeros);
1509
1510         for (i = 0; i < sizeof(sess_kf0); i++) {
1511                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1512         }
1513
1514         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1515
1516         /* MD5 of sess_kf0 and 4 zero bytes */
1517         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1518         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1519
1520         /* MD5 of the above result, plus 8 bytes of sequence number */
1521         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1522         dump_data_pw("sealing_key:\n", sealing_key, 16);
1523 }
1524
1525 /*******************************************************************
1526  Encode or Decode the sequence number (which is symmetric)
1527  ********************************************************************/
1528
1529 static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1530                                      RPC_AUTH_SCHANNEL_CHK *verf)
1531 {
1532         uchar zeros[4];
1533         uchar sequence_key[16];
1534         uchar digest1[16];
1535
1536         ZERO_STRUCT(zeros);
1537
1538         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1539         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1540
1541         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1542
1543         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1544
1545         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1546         SamOEMhash(verf->seq_num, sequence_key, 8);
1547         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1548 }
1549
1550 /*******************************************************************
1551 creates an RPC_AUTH_SCHANNEL_CHK structure.
1552 ********************************************************************/
1553
1554 static bool init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1555                               const uchar sig[8],
1556                               const uchar packet_digest[8],
1557                               const uchar seq_num[8], const uchar confounder[8])
1558 {
1559         if (chk == NULL)
1560                 return False;
1561
1562         memcpy(chk->sig, sig, sizeof(chk->sig));
1563         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1564         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1565         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1566
1567         return True;
1568 }
1569
1570 /*******************************************************************
1571  Encode a blob of data using the schannel alogrithm, also produceing
1572  a checksum over the original data.  We currently only support
1573  signing and sealing togeather - the signing-only code is close, but not
1574  quite compatible with what MS does.
1575  ********************************************************************/
1576
1577 void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1578                    enum schannel_direction direction,
1579                    RPC_AUTH_SCHANNEL_CHK * verf,
1580                    char *data, size_t data_len)
1581 {
1582         uchar digest_final[16];
1583         uchar confounder[8];
1584         uchar seq_num[8];
1585         static const uchar nullbytes[8] = { 0, };
1586
1587         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1588         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1589         const uchar *schannel_sig = NULL;
1590
1591         DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1592
1593         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1594                 schannel_sig = schannel_seal_sig;
1595         } else {
1596                 schannel_sig = schannel_sign_sig;
1597         }
1598
1599         /* fill the 'confounder' with random data */
1600         generate_random_buffer(confounder, sizeof(confounder));
1601
1602         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1603
1604         RSIVAL(seq_num, 0, a->seq_num);
1605
1606         switch (direction) {
1607         case SENDER_IS_INITIATOR:
1608                 SIVAL(seq_num, 4, 0x80);
1609                 break;
1610         case SENDER_IS_ACCEPTOR:
1611                 SIVAL(seq_num, 4, 0x0);
1612                 break;
1613         }
1614
1615         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1616
1617         init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1618                                  seq_num, confounder);
1619
1620         /* produce a digest of the packet to prove it's legit (before we seal it) */
1621         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1622         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1623
1624         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1625                 uchar sealing_key[16];
1626
1627                 /* get the key to encode the data with */
1628                 schannel_get_sealing_key(a, verf, sealing_key);
1629
1630                 /* encode the verification data */
1631                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1632                 SamOEMhash(verf->confounder, sealing_key, 8);
1633
1634                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1635
1636                 /* encode the packet payload */
1637                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1638                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1639                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1640         }
1641
1642         /* encode the sequence number (key based on packet digest) */
1643         /* needs to be done after the sealing, as the original version
1644            is used in the sealing stuff... */
1645         schannel_deal_with_seq_num(a, verf);
1646
1647         return;
1648 }
1649
1650 /*******************************************************************
1651  Decode a blob of data using the schannel alogrithm, also verifiying
1652  a checksum over the original data.  We currently can verify signed messages,
1653  as well as decode sealed messages
1654  ********************************************************************/
1655
1656 bool schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1657                    enum schannel_direction direction,
1658                    RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1659 {
1660         uchar digest_final[16];
1661
1662         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1663         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1664         const uchar *schannel_sig = NULL;
1665
1666         uchar seq_num[8];
1667
1668         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1669
1670         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1671                 schannel_sig = schannel_seal_sig;
1672         } else {
1673                 schannel_sig = schannel_sign_sig;
1674         }
1675
1676         /* Create the expected sequence number for comparison */
1677         RSIVAL(seq_num, 0, a->seq_num);
1678
1679         switch (direction) {
1680         case SENDER_IS_INITIATOR:
1681                 SIVAL(seq_num, 4, 0x80);
1682                 break;
1683         case SENDER_IS_ACCEPTOR:
1684                 SIVAL(seq_num, 4, 0x0);
1685                 break;
1686         }
1687
1688         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1689         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1690
1691         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1692
1693         /* extract the sequence number (key based on supplied packet digest) */
1694         /* needs to be done before the sealing, as the original version
1695            is used in the sealing stuff... */
1696         schannel_deal_with_seq_num(a, verf);
1697
1698         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1699                 /* don't even bother with the below if the sequence number is out */
1700                 /* The sequence number is MD5'ed with a key based on the whole-packet
1701                    digest, as supplied by the client.  We check that it's a valid
1702                    checksum after the decode, below
1703                 */
1704                 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1705                 dump_data(2, verf->seq_num, sizeof(verf->seq_num));
1706                 DEBUG(2, ("should be:\n"));
1707                 dump_data(2, seq_num, sizeof(seq_num));
1708
1709                 return False;
1710         }
1711
1712         if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1713                 /* Validate that the other end sent the expected header */
1714                 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1715                 dump_data(2, verf->sig, sizeof(verf->sig));
1716                 DEBUG(2, ("should be:\n"));
1717                 dump_data(2, schannel_sig, sizeof(schannel_sig));
1718                 return False;
1719         }
1720
1721         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1722                 uchar sealing_key[16];
1723
1724                 /* get the key to extract the data with */
1725                 schannel_get_sealing_key(a, verf, sealing_key);
1726
1727                 /* extract the verification data */
1728                 dump_data_pw("verf->confounder:\n", verf->confounder,
1729                              sizeof(verf->confounder));
1730                 SamOEMhash(verf->confounder, sealing_key, 8);
1731
1732                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1733                              sizeof(verf->confounder));
1734
1735                 /* extract the packet payload */
1736                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1737                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1738                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1739         }
1740
1741         /* digest includes 'data' after unsealing */
1742         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1743
1744         dump_data_pw("Calculated digest:\n", digest_final,
1745                      sizeof(digest_final));
1746         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1747                      sizeof(verf->packet_digest));
1748
1749         /* compare - if the client got the same result as us, then
1750            it must know the session key */
1751         return (memcmp(digest_final, verf->packet_digest,
1752                        sizeof(verf->packet_digest)) == 0);
1753 }
1754
1755 /*******************************************************************
1756 creates a new prs_struct containing a DATA_BLOB
1757 ********************************************************************/
1758 bool prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1759 {
1760         if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL ))
1761                 return False;
1762
1763
1764         if (!prs_copy_data_in(prs, (char *)blob->data, blob->length))
1765                 return False;
1766
1767         return True;
1768 }
1769
1770 /*******************************************************************
1771 return the contents of a prs_struct in a DATA_BLOB
1772 ********************************************************************/
1773 bool prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1774 {
1775         blob->length = prs_data_size(prs);
1776         blob->data = (uint8 *)TALLOC_ZERO_SIZE(mem_ctx, blob->length);
1777
1778         /* set the pointer at the end of the buffer */
1779         prs_set_offset( prs, prs_data_size(prs) );
1780
1781         if (!prs_copy_all_data_out((char *)blob->data, prs))
1782                 return False;
1783
1784         return True;
1785 }