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 uint64_struct
 764  ********************************************************************/
 765 bool prs_uint64(const char *name, prs_struct *ps, int depth, uint64 *data64)
 766 {
 767         if (UNMARSHALLING(ps)) {
 768                 uint32 high, low;
 769
 770                 if (!prs_uint32(name, ps, depth+1, &low))
 771                         return False;
 772
 773                 if (!prs_uint32(name, ps, depth+1, &high))
 774                         return False;
 775
 776                 *data64 = ((uint64_t)high << 32) + low;
 777
 778                 return True;
 779         } else {
 780                 uint32 high = (*data64) >> 32, low = (*data64) & 0xFFFFFFFF;
 781                 return prs_uint32(name, ps, depth+1, &low) &&
 782                            prs_uint32(name, ps, depth+1, &high);
 783         }
 784 }
 785
 786 /*******************************************************************
 787  Stream a NTSTATUS
 788  ********************************************************************/
 789
 790 bool prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 791 {
 792         char *q = prs_mem_get(ps, sizeof(uint32));
 793         if (q == NULL)
 794                 return False;
 795
 796         if (UNMARSHALLING(ps)) {
 797                 if (ps->bigendian_data)
 798                         *status = NT_STATUS(RIVAL(q,0));
 799                 else
 800                         *status = NT_STATUS(IVAL(q,0));
 801         } else {
 802                 if (ps->bigendian_data)
 803                         RSIVAL(q,0,NT_STATUS_V(*status));
 804                 else
 805                         SIVAL(q,0,NT_STATUS_V(*status));
 806         }
 807
 808         DEBUGADD(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
 809                  nt_errstr(*status)));
 810
 811         ps->data_offset += sizeof(uint32);
 812
 813         return True;
 814 }
 815
 816 /*******************************************************************
 817  Stream a DCE error code
 818  ********************************************************************/
 819
 820 bool prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 821 {
 822         char *q = prs_mem_get(ps, sizeof(uint32));
 823         if (q == NULL)
 824                 return False;
 825
 826         if (UNMARSHALLING(ps)) {
 827                 if (ps->bigendian_data)
 828                         *status = NT_STATUS(RIVAL(q,0));
 829                 else
 830                         *status = NT_STATUS(IVAL(q,0));
 831         } else {
 832                 if (ps->bigendian_data)
 833                         RSIVAL(q,0,NT_STATUS_V(*status));
 834                 else
 835                         SIVAL(q,0,NT_STATUS_V(*status));
 836         }
 837
 838         DEBUGADD(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
 839                  dcerpc_errstr(debug_ctx(), NT_STATUS_V(*status))));
 840
 841         ps->data_offset += sizeof(uint32);
 842
 843         return True;
 844 }
 845
 846
 847 /*******************************************************************
 848  Stream a WERROR
 849  ********************************************************************/
 850
 851 bool prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 852 {
 853         char *q = prs_mem_get(ps, sizeof(uint32));
 854         if (q == NULL)
 855                 return False;
 856
 857         if (UNMARSHALLING(ps)) {
 858                 if (ps->bigendian_data)
 859                         *status = W_ERROR(RIVAL(q,0));
 860                 else
 861                         *status = W_ERROR(IVAL(q,0));
 862         } else {
 863                 if (ps->bigendian_data)
 864                         RSIVAL(q,0,W_ERROR_V(*status));
 865                 else
 866                         SIVAL(q,0,W_ERROR_V(*status));
 867         }
 868
 869         DEBUGADD(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
 870                  win_errstr(*status)));
 871
 872         ps->data_offset += sizeof(uint32);
 873
 874         return True;
 875 }
 876
 877
 878 /******************************************************************
 879  Stream an array of uint8s. Length is number of uint8s.
 880  ********************************************************************/
 881
 882 bool prs_uint8s(bool charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 883 {
 884         int i;
 885         char *q = prs_mem_get(ps, len);
 886         if (q == NULL)
 887                 return False;
 888
 889         if (UNMARSHALLING(ps)) {
 890                 for (i = 0; i < len; i++)
 891                         data8s[i] = CVAL(q,i);
 892         } else {
 893                 for (i = 0; i < len; i++)
 894                         SCVAL(q, i, data8s[i]);
 895         }
 896
 897         DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset ,name));
 898         if (charmode)
 899                 print_asc(5, (unsigned char*)data8s, len);
 900         else {
 901                 for (i = 0; i < len; i++)
 902                         DEBUGADD(5,("%02x ", data8s[i]));
 903         }
 904         DEBUGADD(5,("\n"));
 905
 906         ps->data_offset += len;
 907
 908         return True;
 909 }
 910
 911 /******************************************************************
 912  Stream an array of uint16s. Length is number of uint16s.
 913  ********************************************************************/
 914
 915 bool prs_uint16s(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 916 {
 917         int i;
 918         char *q = prs_mem_get(ps, len * sizeof(uint16));
 919         if (q == NULL)
 920                 return False;
 921
 922         if (UNMARSHALLING(ps)) {
 923                 if (ps->bigendian_data) {
 924                         for (i = 0; i < len; i++)
 925                                 data16s[i] = RSVAL(q, 2*i);
 926                 } else {
 927                         for (i = 0; i < len; i++)
 928                                 data16s[i] = SVAL(q, 2*i);
 929                 }
 930         } else {
 931                 if (ps->bigendian_data) {
 932                         for (i = 0; i < len; i++)
 933                                 RSSVAL(q, 2*i, data16s[i]);
 934                 } else {
 935                         for (i = 0; i < len; i++)
 936                                 SSVAL(q, 2*i, data16s[i]);
 937                 }
 938         }
 939
 940         DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
 941         if (charmode)
 942                 print_asc(5, (unsigned char*)data16s, 2*len);
 943         else {
 944                 for (i = 0; i < len; i++)
 945                         DEBUGADD(5,("%04x ", data16s[i]));
 946         }
 947         DEBUGADD(5,("\n"));
 948
 949         ps->data_offset += (len * sizeof(uint16));
 950
 951         return True;
 952 }
 953
 954 /******************************************************************
 955  Start using a function for streaming unicode chars. If unmarshalling,
 956  output must be little-endian, if marshalling, input must be little-endian.
 957  ********************************************************************/
 958
 959 static void dbg_rw_punival(bool charmode, const char *name, int depth, prs_struct *ps,
 960                                                         char *in_buf, char *out_buf, int len)
 961 {
 962         int i;
 963
 964         if (UNMARSHALLING(ps)) {
 965                 if (ps->bigendian_data) {
 966                         for (i = 0; i < len; i++)
 967                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 968                 } else {
 969                         for (i = 0; i < len; i++)
 970                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 971                 }
 972         } else {
 973                 if (ps->bigendian_data) {
 974                         for (i = 0; i < len; i++)
 975                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 976                 } else {
 977                         for (i = 0; i < len; i++)
 978                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 979                 }
 980         }
 981
 982         DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
 983         if (charmode)
 984                 print_asc(5, (unsigned char*)out_buf, 2*len);
 985         else {
 986                 for (i = 0; i < len; i++)
 987                         DEBUGADD(5,("%04x ", out_buf[i]));
 988         }
 989         DEBUGADD(5,("\n"));
 990 }
 991
 992 /******************************************************************
 993  Stream a unistr. Always little endian.
 994  ********************************************************************/
 995
 996 bool prs_uint16uni(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 997 {
 998         char *q = prs_mem_get(ps, len * sizeof(uint16));
 999         if (q == NULL)
1000                 return False;
1001
1002         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
1003         ps->data_offset += (len * sizeof(uint16));
1004
1005         return True;
1006 }
1007
1008 /******************************************************************
1009  Stream an array of uint32s. Length is number of uint32s.
1010  ********************************************************************/
1011
1012 bool prs_uint32s(bool charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
1013 {
1014         int i;
1015         char *q = prs_mem_get(ps, len * sizeof(uint32));
1016         if (q == NULL)
1017                 return False;
1018
1019         if (UNMARSHALLING(ps)) {
1020                 if (ps->bigendian_data) {
1021                         for (i = 0; i < len; i++)
1022                                 data32s[i] = RIVAL(q, 4*i);
1023                 } else {
1024                         for (i = 0; i < len; i++)
1025                                 data32s[i] = IVAL(q, 4*i);
1026                 }
1027         } else {
1028                 if (ps->bigendian_data) {
1029                         for (i = 0; i < len; i++)
1030                                 RSIVAL(q, 4*i, data32s[i]);
1031                 } else {
1032                         for (i = 0; i < len; i++)
1033                                 SIVAL(q, 4*i, data32s[i]);
1034                 }
1035         }
1036
1037         DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1038         if (charmode)
1039                 print_asc(5, (unsigned char*)data32s, 4*len);
1040         else {
1041                 for (i = 0; i < len; i++)
1042                         DEBUGADD(5,("%08x ", data32s[i]));
1043         }
1044         DEBUGADD(5,("\n"));
1045
1046         ps->data_offset += (len * sizeof(uint32));
1047
1048         return True;
1049 }
1050
1051 /*******************************************************************
1052  Stream a unicode  null-terminated string. As the string is already
1053  in little-endian format then do it as a stream of bytes.
1054  ********************************************************************/
1055
1056 bool prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1057 {
1058         unsigned int len = 0;
1059         unsigned char *p = (unsigned char *)str->buffer;
1060         uint8 *start;
1061         char *q;
1062         uint32 max_len;
1063         uint16* ptr;
1064
1065         if (MARSHALLING(ps)) {
1066
1067                 for(len = 0; str->buffer[len] != 0; len++)
1068                         ;
1069
1070                 q = prs_mem_get(ps, (len+1)*2);
1071                 if (q == NULL)
1072                         return False;
1073
1074                 start = (uint8*)q;
1075
1076                 for(len = 0; str->buffer[len] != 0; len++) {
1077                         if(ps->bigendian_data) {
1078                                 /* swap bytes - p is little endian, q is big endian. */
1079                                 q[0] = (char)p[1];
1080                                 q[1] = (char)p[0];
1081                                 p += 2;
1082                                 q += 2;
1083                         }
1084                         else
1085                         {
1086                                 q[0] = (char)p[0];
1087                                 q[1] = (char)p[1];
1088                                 p += 2;
1089                                 q += 2;
1090                         }
1091                 }
1092
1093                 /*
1094                  * even if the string is 'empty' (only an \0 char)
1095                  * at this point the leading \0 hasn't been parsed.
1096                  * so parse it now
1097                  */
1098
1099                 q[0] = 0;
1100                 q[1] = 0;
1101                 q += 2;
1102
1103                 len++;
1104
1105                 DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1106                 print_asc(5, (unsigned char*)start, 2*len);
1107                 DEBUGADD(5, ("\n"));
1108         }
1109         else { /* unmarshalling */
1110
1111                 uint32 alloc_len = 0;
1112                 q = ps->data_p + prs_offset(ps);
1113
1114                 /*
1115                  * Work out how much space we need and talloc it.
1116                  */
1117                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1118
1119                 /* the test of the value of *ptr helps to catch the circumstance
1120                    where we have an emtpty (non-existent) string in the buffer */
1121                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1122                         /* do nothing */
1123                         ;
1124
1125                 if (alloc_len < max_len)
1126                         alloc_len += 1;
1127
1128                 /* should we allocate anything at all? */
1129                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1130                 if ((str->buffer == NULL) && (alloc_len > 0))
1131                         return False;
1132
1133                 p = (unsigned char *)str->buffer;
1134
1135                 len = 0;
1136                 /* the (len < alloc_len) test is to prevent us from overwriting
1137                    memory that is not ours...if we get that far, we have a non-null
1138                    terminated string in the buffer and have messed up somewhere */
1139                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1140                         if(ps->bigendian_data)
1141                         {
1142                                 /* swap bytes - q is big endian, p is little endian. */
1143                                 p[0] = (unsigned char)q[1];
1144                                 p[1] = (unsigned char)q[0];
1145                                 p += 2;
1146                                 q += 2;
1147                         } else {
1148
1149                                 p[0] = (unsigned char)q[0];
1150                                 p[1] = (unsigned char)q[1];
1151                                 p += 2;
1152                                 q += 2;
1153                         }
1154
1155                         len++;
1156                 }
1157                 if (len < alloc_len) {
1158                         /* NULL terminate the UNISTR */
1159                         str->buffer[len++] = '\0';
1160                 }
1161
1162                 DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1163                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1164                 DEBUGADD(5, ("\n"));
1165         }
1166
1167         /* set the offset in the prs_struct; 'len' points to the
1168            terminiating NULL in the UNISTR so we need to go one more
1169            uint16 */
1170         ps->data_offset += (len)*2;
1171
1172         return True;
1173 }
1174
1175
1176 /*******************************************************************
1177  Stream a null-terminated string.  len is strlen, and therefore does
1178  not include the null-termination character.
1179  ********************************************************************/
1180
1181 bool prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1182 {
1183         char *q;
1184         int i;
1185         int len;
1186
1187         if (UNMARSHALLING(ps))
1188                 len = strlen(&ps->data_p[ps->data_offset]);
1189         else
1190                 len = strlen(str);
1191
1192         len = MIN(len, (max_buf_size-1));
1193
1194         q = prs_mem_get(ps, len+1);
1195         if (q == NULL)
1196                 return False;
1197
1198         for(i = 0; i < len; i++) {
1199                 if (UNMARSHALLING(ps))
1200                         str[i] = q[i];
1201                 else
1202                         q[i] = str[i];
1203         }
1204
1205         /* The terminating null. */
1206         str[i] = '\0';
1207
1208         if (MARSHALLING(ps)) {
1209                 q[i] = '\0';
1210         }
1211
1212         ps->data_offset += len+1;
1213
1214         dump_data(5+depth, (uint8 *)q, len);
1215
1216         return True;
1217 }
1218
1219 bool prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str)
1220 {
1221         size_t len;
1222         char *tmp_str;
1223
1224         if (UNMARSHALLING(ps)) {
1225                 len = strlen(&ps->data_p[ps->data_offset]);
1226         } else {
1227                 len = strlen(*str);
1228         }
1229
1230         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1231
1232         if (tmp_str == NULL) {
1233                 return False;
1234         }
1235
1236         if (MARSHALLING(ps)) {
1237                 strncpy(tmp_str, *str, len);
1238         }
1239
1240         if (!prs_string(name, ps, depth, tmp_str, len+1)) {
1241                 return False;
1242         }
1243
1244         *str = tmp_str;
1245         return True;
1246 }
1247
1248 /*******************************************************************
1249  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1250  uint16 should be stored, or gets the size if reading.
1251  ********************************************************************/
1252
1253 bool prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1254 {
1255         *offset = ps->data_offset;
1256         if (UNMARSHALLING(ps)) {
1257                 /* reading. */
1258                 return prs_uint16(name, ps, depth, data16);
1259         } else {
1260                 char *q = prs_mem_get(ps, sizeof(uint16));
1261                 if(q ==NULL)
1262                         return False;
1263                 ps->data_offset += sizeof(uint16);
1264         }
1265         return True;
1266 }
1267
1268 /*******************************************************************
1269  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1270  does nothing on reading, as that is already handled by ...._pre()
1271  ********************************************************************/
1272
1273 bool prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1274                                 uint32 ptr_uint16, uint32 start_offset)
1275 {
1276         if (MARSHALLING(ps)) {
1277                 /*
1278                  * Writing - temporarily move the offset pointer.
1279                  */
1280                 uint16 data_size = ps->data_offset - start_offset;
1281                 uint32 old_offset = ps->data_offset;
1282
1283                 ps->data_offset = ptr_uint16;
1284                 if(!prs_uint16(name, ps, depth, &data_size)) {
1285                         ps->data_offset = old_offset;
1286                         return False;
1287                 }
1288                 ps->data_offset = old_offset;
1289         } else {
1290                 ps->data_offset = start_offset + (uint32)(*data16);
1291         }
1292         return True;
1293 }
1294
1295 /*******************************************************************
1296  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1297  uint32 should be stored, or gets the size if reading.
1298  ********************************************************************/
1299
1300 bool prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1301 {
1302         *offset = ps->data_offset;
1303         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1304                 /* reading. */
1305                 return prs_uint32(name, ps, depth, data32);
1306         } else {
1307                 ps->data_offset += sizeof(uint32);
1308         }
1309         return True;
1310 }
1311
1312 /*******************************************************************
1313  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1314  does nothing on reading, as that is already handled by ...._pre()
1315  ********************************************************************/
1316
1317 bool prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1318                                 uint32 ptr_uint32, uint32 data_size)
1319 {
1320         if (MARSHALLING(ps)) {
1321                 /*
1322                  * Writing - temporarily move the offset pointer.
1323                  */
1324                 uint32 old_offset = ps->data_offset;
1325                 ps->data_offset = ptr_uint32;
1326                 if(!prs_uint32(name, ps, depth, &data_size)) {
1327                         ps->data_offset = old_offset;
1328                         return False;
1329                 }
1330                 ps->data_offset = old_offset;
1331         }
1332         return True;
1333 }
1334
1335 /* useful function to store a structure in rpc wire format */
1336 int tdb_prs_store(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps)
1337 {
1338         TDB_DATA dbuf;
1339         dbuf.dptr = (uint8 *)ps->data_p;
1340         dbuf.dsize = prs_offset(ps);
1341         return tdb_trans_store(tdb, kbuf, dbuf, TDB_REPLACE);
1342 }
1343
1344 /* useful function to fetch a structure into rpc wire format */
1345 int tdb_prs_fetch(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps, TALLOC_CTX *mem_ctx)
1346 {
1347         TDB_DATA dbuf;
1348
1349         prs_init_empty(ps, mem_ctx, UNMARSHALL);
1350
1351         dbuf = tdb_fetch(tdb, kbuf);
1352         if (!dbuf.dptr)
1353                 return -1;
1354
1355         prs_give_memory(ps, (char *)dbuf.dptr, dbuf.dsize, True);
1356
1357         return 0;
1358 }
1359
1360 /*******************************************************************
1361  hash a stream.
1362  ********************************************************************/
1363
1364 bool prs_hash1(prs_struct *ps, uint32 offset, int len)
1365 {
1366         char *q;
1367
1368         q = ps->data_p;
1369         q = &q[offset];
1370
1371 #ifdef DEBUG_PASSWORD
1372         DEBUG(100, ("prs_hash1\n"));
1373         dump_data(100, (uint8 *)ps->sess_key, 16);
1374         dump_data(100, (uint8 *)q, len);
1375 #endif
1376         arcfour_crypt((uchar *) q, (const unsigned char *)ps->sess_key, len);
1377
1378 #ifdef DEBUG_PASSWORD
1379         dump_data(100, (uint8 *)q, len);
1380 #endif
1381
1382         return True;
1383 }
1384
1385 /*******************************************************************
1386  Create a digest over the entire packet (including the data), and
1387  MD5 it with the session key.
1388  ********************************************************************/
1389
1390 static void schannel_digest(struct schannel_auth_struct *a,
1391                           enum pipe_auth_level auth_level,
1392                           RPC_AUTH_SCHANNEL_CHK * verf,
1393                           char *data, size_t data_len,
1394                           uchar digest_final[16])
1395 {
1396         uchar whole_packet_digest[16];
1397         uchar zeros[4];
1398         struct MD5Context ctx3;
1399
1400         ZERO_STRUCT(zeros);
1401
1402         /* verfiy the signature on the packet by MD5 over various bits */
1403         MD5Init(&ctx3);
1404         /* use our sequence number, which ensures the packet is not
1405            out of order */
1406         MD5Update(&ctx3, zeros, sizeof(zeros));
1407         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1408         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1409                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1410         }
1411         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1412         MD5Final(whole_packet_digest, &ctx3);
1413         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1414
1415         /* MD5 this result and the session key, to prove that
1416            only a valid client could had produced this */
1417         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1418 }
1419
1420 /*******************************************************************
1421  Calculate the key with which to encode the data payload
1422  ********************************************************************/
1423
1424 static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1425                                    RPC_AUTH_SCHANNEL_CHK *verf,
1426                                    uchar sealing_key[16])
1427 {
1428         uchar zeros[4];
1429         uchar digest2[16];
1430         uchar sess_kf0[16];
1431         int i;
1432
1433         ZERO_STRUCT(zeros);
1434
1435         for (i = 0; i < sizeof(sess_kf0); i++) {
1436                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1437         }
1438
1439         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1440
1441         /* MD5 of sess_kf0 and 4 zero bytes */
1442         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1443         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1444
1445         /* MD5 of the above result, plus 8 bytes of sequence number */
1446         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1447         dump_data_pw("sealing_key:\n", sealing_key, 16);
1448 }
1449
1450 /*******************************************************************
1451  Encode or Decode the sequence number (which is symmetric)
1452  ********************************************************************/
1453
1454 static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1455                                      RPC_AUTH_SCHANNEL_CHK *verf)
1456 {
1457         uchar zeros[4];
1458         uchar sequence_key[16];
1459         uchar digest1[16];
1460
1461         ZERO_STRUCT(zeros);
1462
1463         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1464         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1465
1466         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1467
1468         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1469
1470         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1471         arcfour_crypt(verf->seq_num, sequence_key, 8);
1472         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1473 }
1474
1475 /*******************************************************************
1476 creates an RPC_AUTH_SCHANNEL_CHK structure.
1477 ********************************************************************/
1478
1479 static bool init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1480                               const uchar sig[8],
1481                               const uchar packet_digest[8],
1482                               const uchar seq_num[8], const uchar confounder[8])
1483 {
1484         if (chk == NULL)
1485                 return False;
1486
1487         memcpy(chk->sig, sig, sizeof(chk->sig));
1488         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1489         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1490         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1491
1492         return True;
1493 }
1494
1495 /*******************************************************************
1496  Encode a blob of data using the schannel alogrithm, also produceing
1497  a checksum over the original data.  We currently only support
1498  signing and sealing togeather - the signing-only code is close, but not
1499  quite compatible with what MS does.
1500  ********************************************************************/
1501
1502 void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1503                    enum schannel_direction direction,
1504                    RPC_AUTH_SCHANNEL_CHK * verf,
1505                    char *data, size_t data_len)
1506 {
1507         uchar digest_final[16];
1508         uchar confounder[8];
1509         uchar seq_num[8];
1510         static const uchar nullbytes[8] = { 0, };
1511
1512         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1513         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1514         const uchar *schannel_sig = NULL;
1515
1516         DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1517
1518         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1519                 schannel_sig = schannel_seal_sig;
1520         } else {
1521                 schannel_sig = schannel_sign_sig;
1522         }
1523
1524         /* fill the 'confounder' with random data */
1525         generate_random_buffer(confounder, sizeof(confounder));
1526
1527         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1528
1529         RSIVAL(seq_num, 0, a->seq_num);
1530
1531         switch (direction) {
1532         case SENDER_IS_INITIATOR:
1533                 SIVAL(seq_num, 4, 0x80);
1534                 break;
1535         case SENDER_IS_ACCEPTOR:
1536                 SIVAL(seq_num, 4, 0x0);
1537                 break;
1538         }
1539
1540         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1541
1542         init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1543                                  seq_num, confounder);
1544
1545         /* produce a digest of the packet to prove it's legit (before we seal it) */
1546         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1547         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1548
1549         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1550                 uchar sealing_key[16];
1551
1552                 /* get the key to encode the data with */
1553                 schannel_get_sealing_key(a, verf, sealing_key);
1554
1555                 /* encode the verification data */
1556                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1557                 arcfour_crypt(verf->confounder, sealing_key, 8);
1558
1559                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1560
1561                 /* encode the packet payload */
1562                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1563                 arcfour_crypt((unsigned char *)data, sealing_key, data_len);
1564                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1565         }
1566
1567         /* encode the sequence number (key based on packet digest) */
1568         /* needs to be done after the sealing, as the original version
1569            is used in the sealing stuff... */
1570         schannel_deal_with_seq_num(a, verf);
1571
1572         return;
1573 }
1574
1575 /*******************************************************************
1576  Decode a blob of data using the schannel alogrithm, also verifiying
1577  a checksum over the original data.  We currently can verify signed messages,
1578  as well as decode sealed messages
1579  ********************************************************************/
1580
1581 bool schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1582                    enum schannel_direction direction,
1583                    RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1584 {
1585         uchar digest_final[16];
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         uchar seq_num[8];
1592
1593         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1594
1595         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1596                 schannel_sig = schannel_seal_sig;
1597         } else {
1598                 schannel_sig = schannel_sign_sig;
1599         }
1600
1601         /* Create the expected sequence number for comparison */
1602         RSIVAL(seq_num, 0, a->seq_num);
1603
1604         switch (direction) {
1605         case SENDER_IS_INITIATOR:
1606                 SIVAL(seq_num, 4, 0x80);
1607                 break;
1608         case SENDER_IS_ACCEPTOR:
1609                 SIVAL(seq_num, 4, 0x0);
1610                 break;
1611         }
1612
1613         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1614         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1615
1616         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1617
1618         /* extract the sequence number (key based on supplied packet digest) */
1619         /* needs to be done before the sealing, as the original version
1620            is used in the sealing stuff... */
1621         schannel_deal_with_seq_num(a, verf);
1622
1623         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1624                 /* don't even bother with the below if the sequence number is out */
1625                 /* The sequence number is MD5'ed with a key based on the whole-packet
1626                    digest, as supplied by the client.  We check that it's a valid
1627                    checksum after the decode, below
1628                 */
1629                 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1630                 dump_data(2, verf->seq_num, sizeof(verf->seq_num));
1631                 DEBUG(2, ("should be:\n"));
1632                 dump_data(2, seq_num, sizeof(seq_num));
1633
1634                 return False;
1635         }
1636
1637         if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1638                 /* Validate that the other end sent the expected header */
1639                 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1640                 dump_data(2, verf->sig, sizeof(verf->sig));
1641                 DEBUG(2, ("should be:\n"));
1642                 dump_data(2, schannel_sig, sizeof(schannel_sig));
1643                 return False;
1644         }
1645
1646         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1647                 uchar sealing_key[16];
1648
1649                 /* get the key to extract the data with */
1650                 schannel_get_sealing_key(a, verf, sealing_key);
1651
1652                 /* extract the verification data */
1653                 dump_data_pw("verf->confounder:\n", verf->confounder,
1654                              sizeof(verf->confounder));
1655                 arcfour_crypt(verf->confounder, sealing_key, 8);
1656
1657                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1658                              sizeof(verf->confounder));
1659
1660                 /* extract the packet payload */
1661                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1662                 arcfour_crypt((unsigned char *)data, sealing_key, data_len);
1663                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1664         }
1665
1666         /* digest includes 'data' after unsealing */
1667         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1668
1669         dump_data_pw("Calculated digest:\n", digest_final,
1670                      sizeof(digest_final));
1671         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1672                      sizeof(verf->packet_digest));
1673
1674         /* compare - if the client got the same result as us, then
1675            it must know the session key */
1676         return (memcmp(digest_final, verf->packet_digest,
1677                        sizeof(verf->packet_digest)) == 0);
1678 }
1679
1680 /*******************************************************************
1681 creates a new prs_struct containing a DATA_BLOB
1682 ********************************************************************/
1683 bool prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1684 {
1685         if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL ))
1686                 return False;
1687
1688
1689         if (!prs_copy_data_in(prs, (char *)blob->data, blob->length))
1690                 return False;
1691
1692         return True;
1693 }
1694
1695 /*******************************************************************
1696 return the contents of a prs_struct in a DATA_BLOB
1697 ********************************************************************/
1698 bool prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1699 {
1700         blob->length = prs_data_size(prs);
1701         blob->data = (uint8 *)TALLOC_ZERO_SIZE(mem_ctx, blob->length);
1702
1703         /* set the pointer at the end of the buffer */
1704         prs_set_offset( prs, prs_data_size(prs) );
1705
1706         if (!prs_copy_all_data_out((char *)blob->data, prs))
1707                 return False;
1708
1709         return True;
1710 }