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