source/rpc_parse/parse_prs.c

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