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