source/rpc_parse/parse_prs.c

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