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 buffer.\n",
 533                                         (unsigned int)extra_size ));
 534                         return NULL;
 535                 }
 536         } else {
 537                 /*
 538                  * Writing - grow the buffer if needed.
 539                  */
 540                 if(!prs_grow(ps, extra_size))
 541                         return NULL;
 542         }
 543         return &ps->data_p[ps->data_offset];
 544 }
 545
 546 /*******************************************************************
 547  Change the struct type.
 548  ********************************************************************/
 549
 550 void prs_switch_type(prs_struct *ps, BOOL io)
 551 {
 552         if ((ps->io ^ io) == True)
 553                 ps->io=io;
 554 }
 555
 556 /*******************************************************************
 557  Force a prs_struct to be dynamic even when it's size is 0.
 558  ********************************************************************/
 559
 560 void prs_force_dynamic(prs_struct *ps)
 561 {
 562         ps->is_dynamic=True;
 563 }
 564
 565 /*******************************************************************
 566  Stream a uint8.
 567  ********************************************************************/
 568
 569 BOOL prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
 570 {
 571         char *q = prs_mem_get(ps, 1);
 572         if (q == NULL)
 573                 return False;
 574
 575     if (UNMARSHALLING(ps))
 576                 *data8 = CVAL(q,0);
 577         else
 578                 SCVAL(q,0,*data8);
 579
 580     DEBUG(5,("%s%04x %s: %02x\n", tab_depth(depth), ps->data_offset, name, *data8));
 581
 582         ps->data_offset += 1;
 583
 584         return True;
 585 }
 586
 587 /*******************************************************************
 588  Stream a uint16* (allocate memory if unmarshalling)
 589  ********************************************************************/
 590
 591 BOOL prs_pointer( const char *name, prs_struct *ps, int depth,
 592                  void **data, size_t data_size,
 593                  BOOL(*prs_fn)(const char*, prs_struct*, int, void*) )
 594 {
 595         uint32 data_p;
 596
 597         /* caputure the pointer value to stream */
 598
 599         data_p = (uint32) *data;
 600
 601         if ( !prs_uint32("ptr", ps, depth, &data_p ))
 602                 return False;
 603
 604         /* we're done if there is no data */
 605
 606         if ( !data_p )
 607                 return True;
 608
 609         if (UNMARSHALLING(ps)) {
 610                 if ( !(*data = PRS_ALLOC_MEM_VOID(ps, data_size)) )
 611                         return False;
 612         }
 613
 614         return prs_fn(name, ps, depth, *data);
 615 }
 616
 617
 618 /*******************************************************************
 619  Stream a uint16.
 620  ********************************************************************/
 621
 622 BOOL prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
 623 {
 624         char *q = prs_mem_get(ps, sizeof(uint16));
 625         if (q == NULL)
 626                 return False;
 627
 628         if (UNMARSHALLING(ps)) {
 629                 if (ps->bigendian_data)
 630                         *data16 = RSVAL(q,0);
 631                 else
 632                         *data16 = SVAL(q,0);
 633         } else {
 634                 if (ps->bigendian_data)
 635                         RSSVAL(q,0,*data16);
 636                 else
 637                         SSVAL(q,0,*data16);
 638         }
 639
 640         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));
 641
 642         ps->data_offset += sizeof(uint16);
 643
 644         return True;
 645 }
 646
 647 /*******************************************************************
 648  Stream a uint32.
 649  ********************************************************************/
 650
 651 BOOL prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
 652 {
 653         char *q = prs_mem_get(ps, sizeof(uint32));
 654         if (q == NULL)
 655                 return False;
 656
 657         if (UNMARSHALLING(ps)) {
 658                 if (ps->bigendian_data)
 659                         *data32 = RIVAL(q,0);
 660                 else
 661                         *data32 = IVAL(q,0);
 662         } else {
 663                 if (ps->bigendian_data)
 664                         RSIVAL(q,0,*data32);
 665                 else
 666                         SIVAL(q,0,*data32);
 667         }
 668
 669         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 670
 671         ps->data_offset += sizeof(uint32);
 672
 673         return True;
 674 }
 675
 676 /*******************************************************************
 677  Stream a NTSTATUS
 678  ********************************************************************/
 679
 680 BOOL prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 681 {
 682         char *q = prs_mem_get(ps, sizeof(uint32));
 683         if (q == NULL)
 684                 return False;
 685
 686         if (UNMARSHALLING(ps)) {
 687                 if (ps->bigendian_data)
 688                         *status = NT_STATUS(RIVAL(q,0));
 689                 else
 690                         *status = NT_STATUS(IVAL(q,0));
 691         } else {
 692                 if (ps->bigendian_data)
 693                         RSIVAL(q,0,NT_STATUS_V(*status));
 694                 else
 695                         SIVAL(q,0,NT_STATUS_V(*status));
 696         }
 697
 698         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 699                  nt_errstr(*status)));
 700
 701         ps->data_offset += sizeof(uint32);
 702
 703         return True;
 704 }
 705
 706 /*******************************************************************
 707  Stream a WERROR
 708  ********************************************************************/
 709
 710 BOOL prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 711 {
 712         char *q = prs_mem_get(ps, sizeof(uint32));
 713         if (q == NULL)
 714                 return False;
 715
 716         if (UNMARSHALLING(ps)) {
 717                 if (ps->bigendian_data)
 718                         *status = W_ERROR(RIVAL(q,0));
 719                 else
 720                         *status = W_ERROR(IVAL(q,0));
 721         } else {
 722                 if (ps->bigendian_data)
 723                         RSIVAL(q,0,W_ERROR_V(*status));
 724                 else
 725                         SIVAL(q,0,W_ERROR_V(*status));
 726         }
 727
 728         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 729                  dos_errstr(*status)));
 730
 731         ps->data_offset += sizeof(uint32);
 732
 733         return True;
 734 }
 735
 736
 737 /******************************************************************
 738  Stream an array of uint8s. Length is number of uint8s.
 739  ********************************************************************/
 740
 741 BOOL prs_uint8s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 742 {
 743         int i;
 744         char *q = prs_mem_get(ps, len);
 745         if (q == NULL)
 746                 return False;
 747
 748         if (UNMARSHALLING(ps)) {
 749                 for (i = 0; i < len; i++)
 750                         data8s[i] = CVAL(q,i);
 751         } else {
 752                 for (i = 0; i < len; i++)
 753                         SCVAL(q, i, data8s[i]);
 754         }
 755
 756         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
 757         if (charmode)
 758                 print_asc(5, (unsigned char*)data8s, len);
 759         else {
 760                 for (i = 0; i < len; i++)
 761                         DEBUG(5,("%02x ", data8s[i]));
 762         }
 763         DEBUG(5,("\n"));
 764
 765         ps->data_offset += len;
 766
 767         return True;
 768 }
 769
 770 /******************************************************************
 771  Stream an array of uint16s. Length is number of uint16s.
 772  ********************************************************************/
 773
 774 BOOL prs_uint16s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 775 {
 776         int i;
 777         char *q = prs_mem_get(ps, len * sizeof(uint16));
 778         if (q == NULL)
 779                 return False;
 780
 781         if (UNMARSHALLING(ps)) {
 782                 if (ps->bigendian_data) {
 783                         for (i = 0; i < len; i++)
 784                                 data16s[i] = RSVAL(q, 2*i);
 785                 } else {
 786                         for (i = 0; i < len; i++)
 787                                 data16s[i] = SVAL(q, 2*i);
 788                 }
 789         } else {
 790                 if (ps->bigendian_data) {
 791                         for (i = 0; i < len; i++)
 792                                 RSSVAL(q, 2*i, data16s[i]);
 793                 } else {
 794                         for (i = 0; i < len; i++)
 795                                 SSVAL(q, 2*i, data16s[i]);
 796                 }
 797         }
 798
 799         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 800         if (charmode)
 801                 print_asc(5, (unsigned char*)data16s, 2*len);
 802         else {
 803                 for (i = 0; i < len; i++)
 804                         DEBUG(5,("%04x ", data16s[i]));
 805         }
 806         DEBUG(5,("\n"));
 807
 808         ps->data_offset += (len * sizeof(uint16));
 809
 810         return True;
 811 }
 812
 813 /******************************************************************
 814  Start using a function for streaming unicode chars. If unmarshalling,
 815  output must be little-endian, if marshalling, input must be little-endian.
 816  ********************************************************************/
 817
 818 static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
 819                                                         char *in_buf, char *out_buf, int len)
 820 {
 821         int i;
 822
 823         if (UNMARSHALLING(ps)) {
 824                 if (ps->bigendian_data) {
 825                         for (i = 0; i < len; i++)
 826                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 827                 } else {
 828                         for (i = 0; i < len; i++)
 829                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 830                 }
 831         } else {
 832                 if (ps->bigendian_data) {
 833                         for (i = 0; i < len; i++)
 834                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 835                 } else {
 836                         for (i = 0; i < len; i++)
 837                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 838                 }
 839         }
 840
 841         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 842         if (charmode)
 843                 print_asc(5, (unsigned char*)out_buf, 2*len);
 844         else {
 845                 for (i = 0; i < len; i++)
 846                         DEBUG(5,("%04x ", out_buf[i]));
 847         }
 848         DEBUG(5,("\n"));
 849 }
 850
 851 /******************************************************************
 852  Stream a unistr. Always little endian.
 853  ********************************************************************/
 854
 855 BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 856 {
 857         char *q = prs_mem_get(ps, len * sizeof(uint16));
 858         if (q == NULL)
 859                 return False;
 860
 861         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 862         ps->data_offset += (len * sizeof(uint16));
 863
 864         return True;
 865 }
 866
 867 /******************************************************************
 868  Stream an array of uint32s. Length is number of uint32s.
 869  ********************************************************************/
 870
 871 BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 872 {
 873         int i;
 874         char *q = prs_mem_get(ps, len * sizeof(uint32));
 875         if (q == NULL)
 876                 return False;
 877
 878         if (UNMARSHALLING(ps)) {
 879                 if (ps->bigendian_data) {
 880                         for (i = 0; i < len; i++)
 881                                 data32s[i] = RIVAL(q, 4*i);
 882                 } else {
 883                         for (i = 0; i < len; i++)
 884                                 data32s[i] = IVAL(q, 4*i);
 885                 }
 886         } else {
 887                 if (ps->bigendian_data) {
 888                         for (i = 0; i < len; i++)
 889                                 RSIVAL(q, 4*i, data32s[i]);
 890                 } else {
 891                         for (i = 0; i < len; i++)
 892                                 SIVAL(q, 4*i, data32s[i]);
 893                 }
 894         }
 895
 896         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 897         if (charmode)
 898                 print_asc(5, (unsigned char*)data32s, 4*len);
 899         else {
 900                 for (i = 0; i < len; i++)
 901                         DEBUG(5,("%08x ", data32s[i]));
 902         }
 903         DEBUG(5,("\n"));
 904
 905         ps->data_offset += (len * sizeof(uint32));
 906
 907         return True;
 908 }
 909
 910 /******************************************************************
 911  Stream an array of unicode string, length/buffer specified separately,
 912  in uint16 chars. The unicode string is already in little-endian format.
 913  ********************************************************************/
 914
 915 BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
 916 {
 917         char *p;
 918         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
 919         if (q == NULL)
 920                 return False;
 921
 922         if (UNMARSHALLING(ps)) {
 923                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
 924                 if (str->buffer == NULL)
 925                         return False;
 926         }
 927
 928         /* If the string is empty, we don't have anything to stream */
 929         if (str->buf_len==0)
 930                 return True;
 931
 932         p = (char *)str->buffer;
 933
 934         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
 935
 936         ps->data_offset += (str->buf_len * sizeof(uint16));
 937
 938         return True;
 939 }
 940
 941 /******************************************************************
 942  Stream a "not" unicode string, length/buffer specified separately,
 943  in byte chars. String is in little-endian format.
 944  ********************************************************************/
 945
 946 BOOL prs_regval_buffer(BOOL charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
 947 {
 948         char *p;
 949         char *q = prs_mem_get(ps, buf->buf_len);
 950         if (q == NULL)
 951                 return False;
 952
 953         if (UNMARSHALLING(ps)) {
 954                 if (buf->buf_len > buf->buf_max_len) {
 955                         return False;
 956                 }
 957                 if ( buf->buf_max_len ) {
 958                         buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
 959                         if ( buf->buffer == NULL )
 960                                 return False;
 961                 }
 962         }
 963
 964         p = (char *)buf->buffer;
 965
 966         dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
 967         ps->data_offset += buf->buf_len;
 968
 969         return True;
 970 }
 971
 972 /******************************************************************
 973  Stream a string, length/buffer specified separately,
 974  in uint8 chars.
 975  ********************************************************************/
 976
 977 BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
 978 {
 979         unsigned int i;
 980         char *q = prs_mem_get(ps, str->str_str_len);
 981         if (q == NULL)
 982                 return False;
 983
 984         if (UNMARSHALLING(ps)) {
 985                 if (str->str_str_len > str->str_max_len) {
 986                         return False;
 987                 }
 988                 str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
 989                 if (str->buffer == NULL)
 990                         return False;
 991         }
 992
 993         if (UNMARSHALLING(ps)) {
 994                 for (i = 0; i < str->str_str_len; i++)
 995                         str->buffer[i] = CVAL(q,i);
 996         } else {
 997                 for (i = 0; i < str->str_str_len; i++)
 998                         SCVAL(q, i, str->buffer[i]);
 999         }
1000
1001         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1002         if (charmode)
1003                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
1004         else {
1005                 for (i = 0; i < str->str_str_len; i++)
1006                         DEBUG(5,("%02x ", str->buffer[i]));
1007         }
1008         DEBUG(5,("\n"));
1009
1010         ps->data_offset += str->str_str_len;
1011
1012         return True;
1013 }
1014
1015 /******************************************************************
1016  Stream a unicode string, length/buffer specified separately,
1017  in uint16 chars. The unicode string is already in little-endian format.
1018  ********************************************************************/
1019
1020 BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1021 {
1022         char *p;
1023         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1024         if (q == NULL)
1025                 return False;
1026
1027         /* If the string is empty, we don't have anything to stream */
1028         if (str->uni_str_len==0)
1029                 return True;
1030
1031         if (UNMARSHALLING(ps)) {
1032                 if (str->uni_str_len > str->uni_max_len) {
1033                         return False;
1034                 }
1035                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1036                 if (str->buffer == NULL)
1037                         return False;
1038         }
1039
1040         p = (char *)str->buffer;
1041
1042         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1043
1044         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1045
1046         return True;
1047 }
1048
1049 /******************************************************************
1050  Stream a unicode string, length/buffer specified separately,
1051  in uint16 chars. The unicode string is already in little-endian format.
1052  ********************************************************************/
1053
1054 BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1055 {
1056         char *p;
1057         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1058         if (q == NULL)
1059                 return False;
1060
1061         if (UNMARSHALLING(ps)) {
1062                 str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1063                 if (str->str.buffer == NULL)
1064                         return False;
1065         }
1066
1067         p = (char *)str->str.buffer;
1068
1069         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1070         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1071
1072         return True;
1073 }
1074
1075 /*******************************************************************
1076  Stream a unicode  null-terminated string. As the string is already
1077  in little-endian format then do it as a stream of bytes.
1078  ********************************************************************/
1079
1080 BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1081 {
1082         unsigned int len = 0;
1083         unsigned char *p = (unsigned char *)str->buffer;
1084         uint8 *start;
1085         char *q;
1086         uint32 max_len;
1087         uint16* ptr;
1088
1089         if (MARSHALLING(ps)) {
1090
1091                 for(len = 0; str->buffer[len] != 0; len++)
1092                         ;
1093
1094                 q = prs_mem_get(ps, (len+1)*2);
1095                 if (q == NULL)
1096                         return False;
1097
1098                 start = (uint8*)q;
1099
1100                 for(len = 0; str->buffer[len] != 0; len++) {
1101                         if(ps->bigendian_data) {
1102                                 /* swap bytes - p is little endian, q is big endian. */
1103                                 q[0] = (char)p[1];
1104                                 q[1] = (char)p[0];
1105                                 p += 2;
1106                                 q += 2;
1107                         }
1108                         else
1109                         {
1110                                 q[0] = (char)p[0];
1111                                 q[1] = (char)p[1];
1112                                 p += 2;
1113                                 q += 2;
1114                         }
1115                 }
1116
1117                 /*
1118                  * even if the string is 'empty' (only an \0 char)
1119                  * at this point the leading \0 hasn't been parsed.
1120                  * so parse it now
1121                  */
1122
1123                 q[0] = 0;
1124                 q[1] = 0;
1125                 q += 2;
1126
1127                 len++;
1128
1129                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1130                 print_asc(5, (unsigned char*)start, 2*len);
1131                 DEBUG(5, ("\n"));
1132         }
1133         else { /* unmarshalling */
1134
1135                 uint32 alloc_len = 0;
1136                 q = ps->data_p + prs_offset(ps);
1137
1138                 /*
1139                  * Work out how much space we need and talloc it.
1140                  */
1141                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1142
1143                 /* the test of the value of *ptr helps to catch the circumstance
1144                    where we have an emtpty (non-existent) string in the buffer */
1145                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1146                         /* do nothing */
1147                         ;
1148
1149                 if (alloc_len < max_len)
1150                         alloc_len += 1;
1151
1152                 /* should we allocate anything at all? */
1153                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1154                 if ((str->buffer == NULL) && (alloc_len > 0))
1155                         return False;
1156
1157                 p = (unsigned char *)str->buffer;
1158
1159                 len = 0;
1160                 /* the (len < alloc_len) test is to prevent us from overwriting
1161                    memory that is not ours...if we get that far, we have a non-null
1162                    terminated string in the buffer and have messed up somewhere */
1163                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1164                         if(ps->bigendian_data)
1165                         {
1166                                 /* swap bytes - q is big endian, p is little endian. */
1167                                 p[0] = (unsigned char)q[1];
1168                                 p[1] = (unsigned char)q[0];
1169                                 p += 2;
1170                                 q += 2;
1171                         } else {
1172
1173                                 p[0] = (unsigned char)q[0];
1174                                 p[1] = (unsigned char)q[1];
1175                                 p += 2;
1176                                 q += 2;
1177                         }
1178
1179                         len++;
1180                 }
1181                 if (len < alloc_len) {
1182                         /* NULL terminate the UNISTR */
1183                         str->buffer[len++] = '\0';
1184                 }
1185
1186                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1187                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1188                 DEBUG(5, ("\n"));
1189         }
1190
1191         /* set the offset in the prs_struct; 'len' points to the
1192            terminiating NULL in the UNISTR so we need to go one more
1193            uint16 */
1194         ps->data_offset += (len)*2;
1195
1196         return True;
1197 }
1198
1199
1200 /*******************************************************************
1201  Stream a null-terminated string.  len is strlen, and therefore does
1202  not include the null-termination character.
1203  ********************************************************************/
1204
1205 BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1206 {
1207         char *q;
1208         int i;
1209         int len;
1210
1211         if (UNMARSHALLING(ps))
1212                 len = strlen(&ps->data_p[ps->data_offset]);
1213         else
1214                 len = strlen(str);
1215
1216         len = MIN(len, (max_buf_size-1));
1217
1218         q = prs_mem_get(ps, len+1);
1219         if (q == NULL)
1220                 return False;
1221
1222         for(i = 0; i < len; i++) {
1223                 if (UNMARSHALLING(ps))
1224                         str[i] = q[i];
1225                 else
1226                         q[i] = str[i];
1227         }
1228
1229         /* The terminating null. */
1230         str[i] = '\0';
1231
1232         if (MARSHALLING(ps)) {
1233                 q[i] = '\0';
1234         }
1235
1236         ps->data_offset += len+1;
1237
1238         dump_data(5+depth, q, len);
1239
1240         return True;
1241 }
1242
1243 BOOL prs_string_alloc(const char *name, prs_struct *ps, int depth,
1244                       const char **str)
1245 {
1246         size_t len;
1247         char *tmp_str;
1248
1249         if (UNMARSHALLING(ps))
1250                 len = strlen(&ps->data_p[ps->data_offset]);
1251         else
1252                 len = strlen(*str);
1253
1254         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1255
1256         if (tmp_str == NULL)
1257                 return False;
1258
1259         if (MARSHALLING(ps))
1260                 strncpy(tmp_str, *str, len);
1261
1262         if (!prs_string(name, ps, depth, tmp_str, len+1))
1263                 return False;
1264
1265         *str = tmp_str;
1266         return True;
1267 }
1268
1269 /*******************************************************************
1270  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1271  uint16 should be stored, or gets the size if reading.
1272  ********************************************************************/
1273
1274 BOOL prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1275 {
1276         *offset = ps->data_offset;
1277         if (UNMARSHALLING(ps)) {
1278                 /* reading. */
1279                 return prs_uint16(name, ps, depth, data16);
1280         } else {
1281                 char *q = prs_mem_get(ps, sizeof(uint16));
1282                 if(q ==NULL)
1283                         return False;
1284                 ps->data_offset += sizeof(uint16);
1285         }
1286         return True;
1287 }
1288
1289 /*******************************************************************
1290  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1291  does nothing on reading, as that is already handled by ...._pre()
1292  ********************************************************************/
1293
1294 BOOL prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1295                                 uint32 ptr_uint16, uint32 start_offset)
1296 {
1297         if (MARSHALLING(ps)) {
1298                 /*
1299                  * Writing - temporarily move the offset pointer.
1300                  */
1301                 uint16 data_size = ps->data_offset - start_offset;
1302                 uint32 old_offset = ps->data_offset;
1303
1304                 ps->data_offset = ptr_uint16;
1305                 if(!prs_uint16(name, ps, depth, &data_size)) {
1306                         ps->data_offset = old_offset;
1307                         return False;
1308                 }
1309                 ps->data_offset = old_offset;
1310         } else {
1311                 ps->data_offset = start_offset + (uint32)(*data16);
1312         }
1313         return True;
1314 }
1315
1316 /*******************************************************************
1317  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1318  uint32 should be stored, or gets the size if reading.
1319  ********************************************************************/
1320
1321 BOOL prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1322 {
1323         *offset = ps->data_offset;
1324         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1325                 /* reading. */
1326                 return prs_uint32(name, ps, depth, data32);
1327         } else {
1328                 ps->data_offset += sizeof(uint32);
1329         }
1330         return True;
1331 }
1332
1333 /*******************************************************************
1334  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1335  does nothing on reading, as that is already handled by ...._pre()
1336  ********************************************************************/
1337
1338 BOOL prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1339                                 uint32 ptr_uint32, uint32 data_size)
1340 {
1341         if (MARSHALLING(ps)) {
1342                 /*
1343                  * Writing - temporarily move the offset pointer.
1344                  */
1345                 uint32 old_offset = ps->data_offset;
1346                 ps->data_offset = ptr_uint32;
1347                 if(!prs_uint32(name, ps, depth, &data_size)) {
1348                         ps->data_offset = old_offset;
1349                         return False;
1350                 }
1351                 ps->data_offset = old_offset;
1352         }
1353         return True;
1354 }
1355
1356 /* useful function to store a structure in rpc wire format */
1357 int tdb_prs_store(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
1358 {
1359     TDB_DATA kbuf, dbuf;
1360     kbuf.dptr = keystr;
1361     kbuf.dsize = strlen(keystr)+1;
1362     dbuf.dptr = ps->data_p;
1363     dbuf.dsize = prs_offset(ps);
1364     return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
1365 }
1366
1367 /* useful function to fetch a structure into rpc wire format */
1368 int tdb_prs_fetch(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
1369 {
1370     TDB_DATA kbuf, dbuf;
1371     kbuf.dptr = keystr;
1372     kbuf.dsize = strlen(keystr)+1;
1373
1374     dbuf = tdb_fetch(tdb, kbuf);
1375     if (!dbuf.dptr)
1376             return -1;
1377
1378     prs_init(ps, 0, mem_ctx, UNMARSHALL);
1379     prs_give_memory(ps, dbuf.dptr, dbuf.dsize, True);
1380
1381     return 0;
1382 }
1383
1384 /*******************************************************************
1385  hash a stream.
1386  ********************************************************************/
1387
1388 BOOL prs_hash1(prs_struct *ps, uint32 offset, uint8 sess_key[16], int len)
1389 {
1390         char *q;
1391
1392         q = ps->data_p;
1393         q = &q[offset];
1394
1395 #ifdef DEBUG_PASSWORD
1396         DEBUG(100, ("prs_hash1\n"));
1397         dump_data(100, sess_key, 16);
1398         dump_data(100, q, len);
1399 #endif
1400         SamOEMhash((uchar *) q, sess_key, len);
1401
1402 #ifdef DEBUG_PASSWORD
1403         dump_data(100, q, len);
1404 #endif
1405
1406         return True;
1407 }
1408
1409 /*******************************************************************
1410  Create a digest over the entire packet (including the data), and
1411  MD5 it with the session key.
1412  ********************************************************************/
1413
1414 static void netsec_digest(struct netsec_auth_struct *a,
1415                           int auth_flags,
1416                           RPC_AUTH_NETSEC_CHK * verf,
1417                           char *data, size_t data_len,
1418                           uchar digest_final[16])
1419 {
1420         uchar whole_packet_digest[16];
1421         static uchar zeros[4];
1422         struct MD5Context ctx3;
1423
1424         /* verfiy the signature on the packet by MD5 over various bits */
1425         MD5Init(&ctx3);
1426         /* use our sequence number, which ensures the packet is not
1427            out of order */
1428         MD5Update(&ctx3, zeros, sizeof(zeros));
1429         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1430         if (auth_flags & AUTH_PIPE_SEAL) {
1431                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1432         }
1433         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1434         MD5Final(whole_packet_digest, &ctx3);
1435         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1436
1437         /* MD5 this result and the session key, to prove that
1438            only a valid client could had produced this */
1439         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1440 }
1441
1442 /*******************************************************************
1443  Calculate the key with which to encode the data payload
1444  ********************************************************************/
1445
1446 static void netsec_get_sealing_key(struct netsec_auth_struct *a,
1447                                    RPC_AUTH_NETSEC_CHK *verf,
1448                                    uchar sealing_key[16])
1449 {
1450         static uchar zeros[4];
1451         uchar digest2[16];
1452         uchar sess_kf0[16];
1453         int i;
1454
1455         for (i = 0; i < sizeof(sess_kf0); i++) {
1456                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1457         }
1458
1459         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1460
1461         /* MD5 of sess_kf0 and 4 zero bytes */
1462         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1463         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1464
1465         /* MD5 of the above result, plus 8 bytes of sequence number */
1466         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1467         dump_data_pw("sealing_key:\n", sealing_key, 16);
1468 }
1469
1470 /*******************************************************************
1471  Encode or Decode the sequence number (which is symmetric)
1472  ********************************************************************/
1473
1474 static void netsec_deal_with_seq_num(struct netsec_auth_struct *a,
1475                                      RPC_AUTH_NETSEC_CHK *verf)
1476 {
1477         static uchar zeros[4];
1478         uchar sequence_key[16];
1479         uchar digest1[16];
1480
1481         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1482         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1483
1484         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1485
1486         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1487
1488         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1489         SamOEMhash(verf->seq_num, sequence_key, 8);
1490         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1491 }
1492
1493 /*******************************************************************
1494 creates an RPC_AUTH_NETSEC_CHK structure.
1495 ********************************************************************/
1496
1497 static BOOL init_rpc_auth_netsec_chk(RPC_AUTH_NETSEC_CHK * chk,
1498                               const uchar sig[8],
1499                               const uchar packet_digest[8],
1500                               const uchar seq_num[8], const uchar confounder[8])
1501 {
1502         if (chk == NULL)
1503                 return False;
1504
1505         memcpy(chk->sig, sig, sizeof(chk->sig));
1506         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1507         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1508         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1509
1510         return True;
1511 }
1512
1513 /*******************************************************************
1514  Encode a blob of data using the netsec (schannel) alogrithm, also produceing
1515  a checksum over the original data.  We currently only support
1516  signing and sealing togeather - the signing-only code is close, but not
1517  quite compatible with what MS does.
1518  ********************************************************************/
1519
1520 void netsec_encode(struct netsec_auth_struct *a, int auth_flags,
1521                    enum netsec_direction direction,
1522                    RPC_AUTH_NETSEC_CHK * verf,
1523                    char *data, size_t data_len)
1524 {
1525         uchar digest_final[16];
1526         uchar confounder[8];
1527         uchar seq_num[8];
1528         static const uchar nullbytes[8];
1529
1530         static const uchar netsec_seal_sig[8] = NETSEC_SEAL_SIGNATURE;
1531         static const uchar netsec_sign_sig[8] = NETSEC_SIGN_SIGNATURE;
1532         const uchar *netsec_sig = NULL;
1533
1534         DEBUG(10,("SCHANNEL: netsec_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1535
1536         if (auth_flags & AUTH_PIPE_SEAL) {
1537                 netsec_sig = netsec_seal_sig;
1538         } else if (auth_flags & AUTH_PIPE_SIGN) {
1539                 netsec_sig = netsec_sign_sig;
1540         }
1541
1542         /* fill the 'confounder' with random data */
1543         generate_random_buffer(confounder, sizeof(confounder));
1544
1545         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1546
1547         RSIVAL(seq_num, 0, a->seq_num);
1548
1549         switch (direction) {
1550         case SENDER_IS_INITIATOR:
1551                 SIVAL(seq_num, 4, 0x80);
1552                 break;
1553         case SENDER_IS_ACCEPTOR:
1554                 SIVAL(seq_num, 4, 0x0);
1555                 break;
1556         }
1557
1558         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1559
1560         init_rpc_auth_netsec_chk(verf, netsec_sig, nullbytes,
1561                                  seq_num, confounder);
1562
1563         /* produce a digest of the packet to prove it's legit (before we seal it) */
1564         netsec_digest(a, auth_flags, verf, data, data_len, digest_final);
1565         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1566
1567         if (auth_flags & AUTH_PIPE_SEAL) {
1568                 uchar sealing_key[16];
1569
1570                 /* get the key to encode the data with */
1571                 netsec_get_sealing_key(a, verf, sealing_key);
1572
1573                 /* encode the verification data */
1574                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1575                 SamOEMhash(verf->confounder, sealing_key, 8);
1576
1577                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1578
1579                 /* encode the packet payload */
1580                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1581                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1582                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1583         }
1584
1585         /* encode the sequence number (key based on packet digest) */
1586         /* needs to be done after the sealing, as the original version
1587            is used in the sealing stuff... */
1588         netsec_deal_with_seq_num(a, verf);
1589
1590         return;
1591 }
1592
1593 /*******************************************************************
1594  Decode a blob of data using the netsec (schannel) alogrithm, also verifiying
1595  a checksum over the original data.  We currently can verify signed messages,
1596  as well as decode sealed messages
1597  ********************************************************************/
1598
1599 BOOL netsec_decode(struct netsec_auth_struct *a, int auth_flags,
1600                    enum netsec_direction direction,
1601                    RPC_AUTH_NETSEC_CHK * verf, char *data, size_t data_len)
1602 {
1603         uchar digest_final[16];
1604
1605         static const uchar netsec_seal_sig[8] = NETSEC_SEAL_SIGNATURE;
1606         static const uchar netsec_sign_sig[8] = NETSEC_SIGN_SIGNATURE;
1607         const uchar *netsec_sig = NULL;
1608
1609         uchar seq_num[8];
1610
1611         DEBUG(10,("SCHANNEL: netsec_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1612
1613         if (auth_flags & AUTH_PIPE_SEAL) {
1614                 netsec_sig = netsec_seal_sig;
1615         } else if (auth_flags & AUTH_PIPE_SIGN) {
1616                 netsec_sig = netsec_sign_sig;
1617         }
1618
1619         /* Create the expected sequence number for comparison */
1620         RSIVAL(seq_num, 0, a->seq_num);
1621
1622         switch (direction) {
1623         case SENDER_IS_INITIATOR:
1624                 SIVAL(seq_num, 4, 0x80);
1625                 break;
1626         case SENDER_IS_ACCEPTOR:
1627                 SIVAL(seq_num, 4, 0x0);
1628                 break;
1629         }
1630
1631         DEBUG(10,("SCHANNEL: netsec_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1632         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1633
1634         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1635
1636         /* extract the sequence number (key based on supplied packet digest) */
1637         /* needs to be done before the sealing, as the original version
1638            is used in the sealing stuff... */
1639         netsec_deal_with_seq_num(a, verf);
1640
1641         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1642                 /* don't even bother with the below if the sequence number is out */
1643                 /* The sequence number is MD5'ed with a key based on the whole-packet
1644                    digest, as supplied by the client.  We check that it's a valid
1645                    checksum after the decode, below
1646                 */
1647                 DEBUG(2, ("netsec_decode: FAILED: packet sequence number:\n"));
1648                 dump_data(2, (const char*)verf->seq_num, sizeof(verf->seq_num));
1649                 DEBUG(2, ("should be:\n"));
1650                 dump_data(2, (const char*)seq_num, sizeof(seq_num));
1651
1652                 return False;
1653         }
1654
1655         if (memcmp(verf->sig, netsec_sig, sizeof(verf->sig))) {
1656                 /* Validate that the other end sent the expected header */
1657                 DEBUG(2, ("netsec_decode: FAILED: packet header:\n"));
1658                 dump_data(2, (const char*)verf->sig, sizeof(verf->sig));
1659                 DEBUG(2, ("should be:\n"));
1660                 dump_data(2, (const char*)netsec_sig, sizeof(netsec_sig));
1661                 return False;
1662         }
1663
1664         if (auth_flags & AUTH_PIPE_SEAL) {
1665                 uchar sealing_key[16];
1666
1667                 /* get the key to extract the data with */
1668                 netsec_get_sealing_key(a, verf, sealing_key);
1669
1670                 /* extract the verification data */
1671                 dump_data_pw("verf->confounder:\n", verf->confounder,
1672                              sizeof(verf->confounder));
1673                 SamOEMhash(verf->confounder, sealing_key, 8);
1674
1675                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1676                              sizeof(verf->confounder));
1677
1678                 /* extract the packet payload */
1679                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1680                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1681                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1682         }
1683
1684         /* digest includes 'data' after unsealing */
1685         netsec_digest(a, auth_flags, verf, data, data_len, digest_final);
1686
1687         dump_data_pw("Calculated digest:\n", digest_final,
1688                      sizeof(digest_final));
1689         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1690                      sizeof(verf->packet_digest));
1691
1692         /* compare - if the client got the same result as us, then
1693            it must know the session key */
1694         return (memcmp(digest_final, verf->packet_digest,
1695                        sizeof(verf->packet_digest)) == 0);
1696 }