source3/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 *)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 char *prs_alloc_mem(prs_struct *ps, size_t size)
 147 {
 148         char *ret = NULL;
 149
 150         if (size) {
 151                 ret = talloc(ps->mem_ctx, size);
 152                 if (ret)
 153                         memset(ret, '\0', size);
 154         }
 155         return ret;
 156 }
 157
 158 /*******************************************************************
 159  Return the current talloc context we're using.
 160  ********************************************************************/
 161
 162 TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
 163 {
 164         return ps->mem_ctx;
 165 }
 166
 167 /*******************************************************************
 168  Hand some already allocated memory to a prs_struct.
 169  ********************************************************************/
 170
 171 void prs_give_memory(prs_struct *ps, char *buf, uint32 size, BOOL is_dynamic)
 172 {
 173         ps->is_dynamic = is_dynamic;
 174         ps->data_p = buf;
 175         ps->buffer_size = size;
 176 }
 177
 178 /*******************************************************************
 179  Take some memory back from a prs_struct.
 180  ********************************************************************/
 181
 182 char *prs_take_memory(prs_struct *ps, uint32 *psize)
 183 {
 184         char *ret = ps->data_p;
 185         if(psize)
 186                 *psize = ps->buffer_size;
 187         ps->is_dynamic = False;
 188         prs_mem_free(ps);
 189         return ret;
 190 }
 191
 192 /*******************************************************************
 193  Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
 194  ********************************************************************/
 195
 196 BOOL prs_set_buffer_size(prs_struct *ps, uint32 newsize)
 197 {
 198         if (newsize > ps->buffer_size)
 199                 return prs_force_grow(ps, newsize - ps->buffer_size);
 200
 201         if (newsize < ps->buffer_size) {
 202                 char *new_data_p = Realloc(ps->data_p, newsize);
 203                 /* if newsize is zero, Realloc acts like free() & returns NULL*/
 204                 if (new_data_p == NULL && newsize != 0) {
 205                         DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
 206                                 (unsigned int)newsize));
 207                         DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
 208                         return False;
 209                 }
 210                 ps->data_p = new_data_p;
 211                 ps->buffer_size = newsize;
 212         }
 213
 214         return True;
 215 }
 216
 217 /*******************************************************************
 218  Attempt, if needed, to grow a data buffer.
 219  Also depends on the data stream mode (io).
 220  ********************************************************************/
 221
 222 BOOL prs_grow(prs_struct *ps, uint32 extra_space)
 223 {
 224         uint32 new_size;
 225         char *new_data;
 226
 227         ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
 228
 229         if(ps->data_offset + extra_space <= ps->buffer_size)
 230                 return True;
 231
 232         /*
 233          * We cannot grow the buffer if we're not reading
 234          * into the prs_struct, or if we don't own the memory.
 235          */
 236
 237         if(UNMARSHALLING(ps) || !ps->is_dynamic) {
 238                 DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 239                                 (unsigned int)extra_space));
 240                 return False;
 241         }
 242
 243         /*
 244          * Decide how much extra space we really need.
 245          */
 246
 247         extra_space -= (ps->buffer_size - ps->data_offset);
 248         if(ps->buffer_size == 0) {
 249                 /*
 250                  * Ensure we have at least a PDU's length, or extra_space, whichever
 251                  * is greater.
 252                  */
 253
 254                 new_size = MAX(MAX_PDU_FRAG_LEN,extra_space);
 255
 256                 if((new_data = malloc(new_size)) == NULL) {
 257                         DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
 258                         return False;
 259                 }
 260                 memset(new_data, '\0', (size_t)new_size );
 261         } else {
 262                 /*
 263                  * If the current buffer size is bigger than the space needed, just
 264                  * double it, else add extra_space.
 265                  */
 266                 new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);
 267
 268                 if ((new_data = Realloc(ps->data_p, new_size)) == NULL) {
 269                         DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
 270                                 (unsigned int)new_size));
 271                         return False;
 272                 }
 273
 274                 memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 275         }
 276         ps->buffer_size = new_size;
 277         ps->data_p = new_data;
 278
 279         return True;
 280 }
 281
 282 /*******************************************************************
 283  Attempt to force a data buffer to grow by len bytes.
 284  This is only used when appending more data onto a prs_struct
 285  when reading an rpc reply, before unmarshalling it.
 286  ********************************************************************/
 287
 288 BOOL prs_force_grow(prs_struct *ps, uint32 extra_space)
 289 {
 290         uint32 new_size = ps->buffer_size + extra_space;
 291         char *new_data;
 292
 293         if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
 294                 DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 295                                 (unsigned int)extra_space));
 296                 return False;
 297         }
 298
 299         if((new_data = Realloc(ps->data_p, new_size)) == NULL) {
 300                 DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
 301                         (unsigned int)new_size));
 302                 return False;
 303         }
 304
 305         memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 306
 307         ps->buffer_size = new_size;
 308         ps->data_p = new_data;
 309
 310         return True;
 311 }
 312
 313 /*******************************************************************
 314  Get the data pointer (external interface).
 315 ********************************************************************/
 316
 317 char *prs_data_p(prs_struct *ps)
 318 {
 319         return ps->data_p;
 320 }
 321
 322 /*******************************************************************
 323  Get the current data size (external interface).
 324  ********************************************************************/
 325
 326 uint32 prs_data_size(prs_struct *ps)
 327 {
 328         return ps->buffer_size;
 329 }
 330
 331 /*******************************************************************
 332  Fetch the current offset (external interface).
 333  ********************************************************************/
 334
 335 uint32 prs_offset(prs_struct *ps)
 336 {
 337         return ps->data_offset;
 338 }
 339
 340 /*******************************************************************
 341  Set the current offset (external interface).
 342  ********************************************************************/
 343
 344 BOOL prs_set_offset(prs_struct *ps, uint32 offset)
 345 {
 346         if(offset <= ps->data_offset) {
 347                 ps->data_offset = offset;
 348                 return True;
 349         }
 350
 351         if(!prs_grow(ps, offset - ps->data_offset))
 352                 return False;
 353
 354         ps->data_offset = offset;
 355         return True;
 356 }
 357
 358 /*******************************************************************
 359  Append the data from one parse_struct into another.
 360  ********************************************************************/
 361
 362 BOOL prs_append_prs_data(prs_struct *dst, prs_struct *src)
 363 {
 364         if (prs_offset(src) == 0)
 365                 return True;
 366
 367         if(!prs_grow(dst, prs_offset(src)))
 368                 return False;
 369
 370         memcpy(&dst->data_p[dst->data_offset], src->data_p, (size_t)prs_offset(src));
 371         dst->data_offset += prs_offset(src);
 372
 373         return True;
 374 }
 375
 376 /*******************************************************************
 377  Append some data from one parse_struct into another.
 378  ********************************************************************/
 379
 380 BOOL prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, uint32 len)
 381 {
 382         if (len == 0)
 383                 return True;
 384
 385         if(!prs_grow(dst, len))
 386                 return False;
 387
 388         memcpy(&dst->data_p[dst->data_offset], src->data_p + start, (size_t)len);
 389         dst->data_offset += len;
 390
 391         return True;
 392 }
 393
 394 /*******************************************************************
 395  Append the data from a buffer into a parse_struct.
 396  ********************************************************************/
 397
 398 BOOL prs_copy_data_in(prs_struct *dst, char *src, uint32 len)
 399 {
 400         if (len == 0)
 401                 return True;
 402
 403         if(!prs_grow(dst, len))
 404                 return False;
 405
 406         memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
 407         dst->data_offset += len;
 408
 409         return True;
 410 }
 411
 412 /*******************************************************************
 413  Copy some data from a parse_struct into a buffer.
 414  ********************************************************************/
 415
 416 BOOL prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
 417 {
 418         if (len == 0)
 419                 return True;
 420
 421         if(!prs_mem_get(src, len))
 422                 return False;
 423
 424         memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
 425         src->data_offset += len;
 426
 427         return True;
 428 }
 429
 430 /*******************************************************************
 431  Copy all the data from a parse_struct into a buffer.
 432  ********************************************************************/
 433
 434 BOOL prs_copy_all_data_out(char *dst, prs_struct *src)
 435 {
 436         uint32 len = prs_offset(src);
 437
 438         if (!len)
 439                 return True;
 440
 441         prs_set_offset(src, 0);
 442         return prs_copy_data_out(dst, src, len);
 443 }
 444
 445 /*******************************************************************
 446  Set the data as X-endian (external interface).
 447  ********************************************************************/
 448
 449 void prs_set_endian_data(prs_struct *ps, BOOL endian)
 450 {
 451         ps->bigendian_data = endian;
 452 }
 453
 454 /*******************************************************************
 455  Align a the data_len to a multiple of align bytes - filling with
 456  zeros.
 457  ********************************************************************/
 458
 459 BOOL prs_align(prs_struct *ps)
 460 {
 461         uint32 mod = ps->data_offset & (ps->align-1);
 462
 463         if (ps->align != 0 && mod != 0) {
 464                 uint32 extra_space = (ps->align - mod);
 465                 if(!prs_grow(ps, extra_space))
 466                         return False;
 467                 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
 468                 ps->data_offset += extra_space;
 469         }
 470
 471         return True;
 472 }
 473
 474 /******************************************************************
 475  Align on a 2 byte boundary
 476  *****************************************************************/
 477
 478 BOOL prs_align_uint16(prs_struct *ps)
 479 {
 480         BOOL ret;
 481         uint8 old_align = ps->align;
 482
 483         ps->align = 2;
 484         ret = prs_align(ps);
 485         ps->align = old_align;
 486
 487         return ret;
 488 }
 489
 490 /******************************************************************
 491  Align on a 8 byte boundary
 492  *****************************************************************/
 493
 494 BOOL prs_align_uint64(prs_struct *ps)
 495 {
 496         BOOL ret;
 497         uint8 old_align = ps->align;
 498
 499         ps->align = 8;
 500         ret = prs_align(ps);
 501         ps->align = old_align;
 502
 503         return ret;
 504 }
 505
 506 /*******************************************************************
 507  Align only if required (for the unistr2 string mainly)
 508  ********************************************************************/
 509
 510 BOOL prs_align_needed(prs_struct *ps, uint32 needed)
 511 {
 512         if (needed==0)
 513                 return True;
 514         else
 515                 return prs_align(ps);
 516 }
 517
 518 /*******************************************************************
 519  Ensure we can read/write to a given offset.
 520  ********************************************************************/
 521
 522 char *prs_mem_get(prs_struct *ps, uint32 extra_size)
 523 {
 524         if(UNMARSHALLING(ps)) {
 525                 /*
 526                  * If reading, ensure that we can read the requested size item.
 527                  */
 528                 if (ps->data_offset + extra_size > ps->buffer_size) {
 529                         DEBUG(0,("prs_mem_get: reading data of size %u would overrun buffer.\n",
 530                                         (unsigned int)extra_size ));
 531                         return NULL;
 532                 }
 533         } else {
 534                 /*
 535                  * Writing - grow the buffer if needed.
 536                  */
 537                 if(!prs_grow(ps, extra_size))
 538                         return NULL;
 539         }
 540         return &ps->data_p[ps->data_offset];
 541 }
 542
 543 /*******************************************************************
 544  Change the struct type.
 545  ********************************************************************/
 546
 547 void prs_switch_type(prs_struct *ps, BOOL io)
 548 {
 549         if ((ps->io ^ io) == True)
 550                 ps->io=io;
 551 }
 552
 553 /*******************************************************************
 554  Force a prs_struct to be dynamic even when it's size is 0.
 555  ********************************************************************/
 556
 557 void prs_force_dynamic(prs_struct *ps)
 558 {
 559         ps->is_dynamic=True;
 560 }
 561
 562 /*******************************************************************
 563  Stream a uint8.
 564  ********************************************************************/
 565
 566 BOOL prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
 567 {
 568         char *q = prs_mem_get(ps, 1);
 569         if (q == NULL)
 570                 return False;
 571
 572     if (UNMARSHALLING(ps))
 573                 *data8 = CVAL(q,0);
 574         else
 575                 SCVAL(q,0,*data8);
 576
 577     DEBUG(5,("%s%04x %s: %02x\n", tab_depth(depth), ps->data_offset, name, *data8));
 578
 579         ps->data_offset += 1;
 580
 581         return True;
 582 }
 583
 584 /*******************************************************************
 585  Stream a uint16.
 586  ********************************************************************/
 587
 588 BOOL prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
 589 {
 590         char *q = prs_mem_get(ps, sizeof(uint16));
 591         if (q == NULL)
 592                 return False;
 593
 594     if (UNMARSHALLING(ps)) {
 595                 if (ps->bigendian_data)
 596                         *data16 = RSVAL(q,0);
 597                 else
 598                         *data16 = SVAL(q,0);
 599     } else {
 600                 if (ps->bigendian_data)
 601                         RSSVAL(q,0,*data16);
 602                 else
 603                         SSVAL(q,0,*data16);
 604         }
 605
 606         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));
 607
 608         ps->data_offset += sizeof(uint16);
 609
 610         return True;
 611 }
 612
 613 /*******************************************************************
 614  Stream a uint32.
 615  ********************************************************************/
 616
 617 BOOL prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
 618 {
 619         char *q = prs_mem_get(ps, sizeof(uint32));
 620         if (q == NULL)
 621                 return False;
 622
 623         if (UNMARSHALLING(ps)) {
 624                 if (ps->bigendian_data)
 625                         *data32 = RIVAL(q,0);
 626                 else
 627                         *data32 = IVAL(q,0);
 628         } else {
 629                 if (ps->bigendian_data)
 630                         RSIVAL(q,0,*data32);
 631                 else
 632                         SIVAL(q,0,*data32);
 633         }
 634
 635         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 636
 637         ps->data_offset += sizeof(uint32);
 638
 639         return True;
 640 }
 641
 642 /*******************************************************************
 643  Stream a NTSTATUS
 644  ********************************************************************/
 645
 646 BOOL prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 647 {
 648         char *q = prs_mem_get(ps, sizeof(uint32));
 649         if (q == NULL)
 650                 return False;
 651
 652         if (UNMARSHALLING(ps)) {
 653                 if (ps->bigendian_data)
 654                         *status = NT_STATUS(RIVAL(q,0));
 655                 else
 656                         *status = NT_STATUS(IVAL(q,0));
 657         } else {
 658                 if (ps->bigendian_data)
 659                         RSIVAL(q,0,NT_STATUS_V(*status));
 660                 else
 661                         SIVAL(q,0,NT_STATUS_V(*status));
 662         }
 663
 664         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 665                  nt_errstr(*status)));
 666
 667         ps->data_offset += sizeof(uint32);
 668
 669         return True;
 670 }
 671
 672 /*******************************************************************
 673  Stream a WERROR
 674  ********************************************************************/
 675
 676 BOOL prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 677 {
 678         char *q = prs_mem_get(ps, sizeof(uint32));
 679         if (q == NULL)
 680                 return False;
 681
 682         if (UNMARSHALLING(ps)) {
 683                 if (ps->bigendian_data)
 684                         *status = W_ERROR(RIVAL(q,0));
 685                 else
 686                         *status = W_ERROR(IVAL(q,0));
 687         } else {
 688                 if (ps->bigendian_data)
 689                         RSIVAL(q,0,W_ERROR_V(*status));
 690                 else
 691                         SIVAL(q,0,W_ERROR_V(*status));
 692         }
 693
 694         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 695                  dos_errstr(*status)));
 696
 697         ps->data_offset += sizeof(uint32);
 698
 699         return True;
 700 }
 701
 702
 703 /******************************************************************
 704  Stream an array of uint8s. Length is number of uint8s.
 705  ********************************************************************/
 706
 707 BOOL prs_uint8s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 708 {
 709         int i;
 710         char *q = prs_mem_get(ps, len);
 711         if (q == NULL)
 712                 return False;
 713
 714         if (UNMARSHALLING(ps)) {
 715                 for (i = 0; i < len; i++)
 716                         data8s[i] = CVAL(q,i);
 717         } else {
 718                 for (i = 0; i < len; i++)
 719                         SCVAL(q, i, data8s[i]);
 720         }
 721
 722     DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
 723     if (charmode)
 724                 print_asc(5, (unsigned char*)data8s, len);
 725         else {
 726         for (i = 0; i < len; i++)
 727                         DEBUG(5,("%02x ", data8s[i]));
 728         }
 729     DEBUG(5,("\n"));
 730
 731         ps->data_offset += len;
 732
 733         return True;
 734 }
 735
 736 /******************************************************************
 737  Stream an array of uint16s. Length is number of uint16s.
 738  ********************************************************************/
 739
 740 BOOL prs_uint16s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 741 {
 742         int i;
 743         char *q = prs_mem_get(ps, len * sizeof(uint16));
 744         if (q == NULL)
 745                 return False;
 746
 747         if (UNMARSHALLING(ps)) {
 748                 if (ps->bigendian_data) {
 749                         for (i = 0; i < len; i++)
 750                                 data16s[i] = RSVAL(q, 2*i);
 751                 } else {
 752                         for (i = 0; i < len; i++)
 753                                 data16s[i] = SVAL(q, 2*i);
 754                 }
 755         } else {
 756                 if (ps->bigendian_data) {
 757                         for (i = 0; i < len; i++)
 758                                 RSSVAL(q, 2*i, data16s[i]);
 759                 } else {
 760                         for (i = 0; i < len; i++)
 761                                 SSVAL(q, 2*i, data16s[i]);
 762                 }
 763         }
 764
 765         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 766         if (charmode)
 767                 print_asc(5, (unsigned char*)data16s, 2*len);
 768         else {
 769                 for (i = 0; i < len; i++)
 770                         DEBUG(5,("%04x ", data16s[i]));
 771         }
 772     DEBUG(5,("\n"));
 773
 774         ps->data_offset += (len * sizeof(uint16));
 775
 776         return True;
 777 }
 778
 779 /******************************************************************
 780  Start using a function for streaming unicode chars. If unmarshalling,
 781  output must be little-endian, if marshalling, input must be little-endian.
 782  ********************************************************************/
 783
 784 static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
 785                                                         char *in_buf, char *out_buf, int len)
 786 {
 787         int i;
 788
 789         if (UNMARSHALLING(ps)) {
 790                 if (ps->bigendian_data) {
 791                         for (i = 0; i < len; i++)
 792                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 793                 } else {
 794                         for (i = 0; i < len; i++)
 795                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 796                 }
 797         } else {
 798                 if (ps->bigendian_data) {
 799                         for (i = 0; i < len; i++)
 800                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 801                 } else {
 802                         for (i = 0; i < len; i++)
 803                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 804                 }
 805         }
 806
 807         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 808         if (charmode)
 809                 print_asc(5, (unsigned char*)out_buf, 2*len);
 810         else {
 811                 for (i = 0; i < len; i++)
 812                         DEBUG(5,("%04x ", out_buf[i]));
 813         }
 814     DEBUG(5,("\n"));
 815 }
 816
 817 /******************************************************************
 818  Stream a unistr. Always little endian.
 819  ********************************************************************/
 820
 821 BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 822 {
 823         char *q = prs_mem_get(ps, len * sizeof(uint16));
 824         if (q == NULL)
 825                 return False;
 826
 827         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 828         ps->data_offset += (len * sizeof(uint16));
 829
 830         return True;
 831 }
 832
 833 /******************************************************************
 834  Stream an array of uint32s. Length is number of uint32s.
 835  ********************************************************************/
 836
 837 BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 838 {
 839         int i;
 840         char *q = prs_mem_get(ps, len * sizeof(uint32));
 841         if (q == NULL)
 842                 return False;
 843
 844         if (UNMARSHALLING(ps)) {
 845                 if (ps->bigendian_data) {
 846                         for (i = 0; i < len; i++)
 847                                 data32s[i] = RIVAL(q, 4*i);
 848                 } else {
 849                         for (i = 0; i < len; i++)
 850                                 data32s[i] = IVAL(q, 4*i);
 851                 }
 852         } else {
 853                 if (ps->bigendian_data) {
 854                         for (i = 0; i < len; i++)
 855                                 RSIVAL(q, 4*i, data32s[i]);
 856                 } else {
 857                         for (i = 0; i < len; i++)
 858                                 SIVAL(q, 4*i, data32s[i]);
 859                 }
 860         }
 861
 862         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 863         if (charmode)
 864                 print_asc(5, (unsigned char*)data32s, 4*len);
 865         else {
 866                 for (i = 0; i < len; i++)
 867                         DEBUG(5,("%08x ", data32s[i]));
 868         }
 869     DEBUG(5,("\n"));
 870
 871         ps->data_offset += (len * sizeof(uint32));
 872
 873         return True;
 874 }
 875
 876 /******************************************************************
 877  Stream an array of unicode string, length/buffer specified separately,
 878  in uint16 chars. The unicode string is already in little-endian format.
 879  ********************************************************************/
 880
 881 BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
 882 {
 883         char *p;
 884         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
 885         if (q == NULL)
 886                 return False;
 887
 888         if (UNMARSHALLING(ps)) {
 889                 str->buffer = (uint16 *)prs_alloc_mem(ps,str->buf_len * sizeof(uint16));
 890                 if (str->buffer == NULL)
 891                         return False;
 892         }
 893
 894         /* If the string is empty, we don't have anything to stream */
 895         if (str->buf_len==0)
 896                 return True;
 897
 898         p = (char *)str->buffer;
 899
 900         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
 901
 902         ps->data_offset += (str->buf_len * sizeof(uint16));
 903
 904         return True;
 905 }
 906
 907 /******************************************************************
 908  Stream a "not" unicode string, length/buffer specified separately,
 909  in byte chars. String is in little-endian format.
 910  ********************************************************************/
 911
 912 BOOL prs_buffer2(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER2 *str)
 913 {
 914         char *p;
 915         char *q = prs_mem_get(ps, str->buf_len);
 916         if (q == NULL)
 917                 return False;
 918
 919         if (UNMARSHALLING(ps)) {
 920                 if ( str->buf_len ) {
 921                         str->buffer = (uint16 *)prs_alloc_mem(ps,str->buf_len);
 922                         if ( str->buffer == NULL )
 923                                 return False;
 924                 }
 925         }
 926
 927         p = (char *)str->buffer;
 928
 929         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len/2);
 930         ps->data_offset += str->buf_len;
 931
 932         return True;
 933 }
 934
 935 /******************************************************************
 936  Stream a string, length/buffer specified separately,
 937  in uint8 chars.
 938  ********************************************************************/
 939
 940 BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
 941 {
 942         unsigned int i;
 943         char *q = prs_mem_get(ps, str->str_max_len);
 944         if (q == NULL)
 945                 return False;
 946
 947         if (UNMARSHALLING(ps)) {
 948                 str->buffer = (unsigned char *)prs_alloc_mem(ps,str->str_max_len);
 949                 if (str->buffer == NULL)
 950                         return False;
 951         }
 952
 953         if (UNMARSHALLING(ps)) {
 954                 for (i = 0; i < str->str_str_len; i++)
 955                         str->buffer[i] = CVAL(q,i);
 956         } else {
 957                 for (i = 0; i < str->str_str_len; i++)
 958                         SCVAL(q, i, str->buffer[i]);
 959         }
 960
 961     DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 962     if (charmode)
 963                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
 964         else {
 965         for (i = 0; i < str->str_str_len; i++)
 966                         DEBUG(5,("%02x ", str->buffer[i]));
 967         }
 968     DEBUG(5,("\n"));
 969
 970         ps->data_offset += str->str_str_len;
 971
 972         return True;
 973 }
 974
 975 /******************************************************************
 976  Stream a unicode string, length/buffer specified separately,
 977  in uint16 chars. The unicode string is already in little-endian format.
 978  ********************************************************************/
 979
 980 BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
 981 {
 982         char *p;
 983         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
 984         if (q == NULL)
 985                 return False;
 986
 987         /* If the string is empty, we don't have anything to stream */
 988         if (str->uni_str_len==0)
 989                 return True;
 990
 991         if (UNMARSHALLING(ps)) {
 992                 str->buffer = (uint16 *)prs_alloc_mem(ps,str->uni_max_len * sizeof(uint16));
 993                 if (str->buffer == NULL)
 994                         return False;
 995         }
 996
 997         p = (char *)str->buffer;
 998
 999         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1000
1001         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1002
1003         return True;
1004 }
1005
1006 /******************************************************************
1007  Stream a unicode string, length/buffer specified separately,
1008  in uint16 chars. The unicode string is already in little-endian format.
1009  ********************************************************************/
1010
1011 BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1012 {
1013         char *p;
1014         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1015         if (q == NULL)
1016                 return False;
1017
1018         if (UNMARSHALLING(ps)) {
1019                 str->str.buffer = (uint16 *)prs_alloc_mem(ps,str->uni_str_len * sizeof(uint16));
1020                 if (str->str.buffer == NULL)
1021                         return False;
1022         }
1023
1024         p = (char *)str->str.buffer;
1025
1026         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1027         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1028
1029         return True;
1030 }
1031
1032 /*******************************************************************
1033  Stream a unicode  null-terminated string. As the string is already
1034  in little-endian format then do it as a stream of bytes.
1035  ********************************************************************/
1036
1037 BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1038 {
1039         unsigned int len = 0;
1040         unsigned char *p = (unsigned char *)str->buffer;
1041         uint8 *start;
1042         char *q;
1043         uint32 max_len;
1044         uint16* ptr;
1045
1046         if (MARSHALLING(ps)) {
1047
1048                 for(len = 0; str->buffer[len] != 0; len++)
1049                         ;
1050
1051                 q = prs_mem_get(ps, (len+1)*2);
1052                 if (q == NULL)
1053                         return False;
1054
1055                 start = (uint8*)q;
1056
1057                 for(len = 0; str->buffer[len] != 0; len++)
1058                 {
1059                         if(ps->bigendian_data)
1060                         {
1061                                 /* swap bytes - p is little endian, q is big endian. */
1062                                 q[0] = (char)p[1];
1063                                 q[1] = (char)p[0];
1064                                 p += 2;
1065                                 q += 2;
1066                         }
1067                         else
1068                         {
1069                                 q[0] = (char)p[0];
1070                                 q[1] = (char)p[1];
1071                                 p += 2;
1072                                 q += 2;
1073                         }
1074                 }
1075
1076                 /*
1077                  * even if the string is 'empty' (only an \0 char)
1078                  * at this point the leading \0 hasn't been parsed.
1079                  * so parse it now
1080                  */
1081
1082                 q[0] = 0;
1083                 q[1] = 0;
1084                 q += 2;
1085
1086                 len++;
1087
1088                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1089                 print_asc(5, (unsigned char*)start, 2*len);
1090                 DEBUG(5, ("\n"));
1091         }
1092         else { /* unmarshalling */
1093
1094                 uint32 alloc_len = 0;
1095                 q = ps->data_p + prs_offset(ps);
1096
1097                 /*
1098                  * Work out how much space we need and talloc it.
1099                  */
1100                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1101
1102                 /* the test of the value of *ptr helps to catch the circumstance
1103                    where we have an emtpty (non-existent) string in the buffer */
1104                 for ( ptr = (uint16 *)q; *ptr && (alloc_len <= max_len); alloc_len++)
1105                         /* do nothing */
1106                         ;
1107
1108                 /* should we allocate anything at all? */
1109                 str->buffer = (uint16 *)prs_alloc_mem(ps,alloc_len * sizeof(uint16));
1110                 if ((str->buffer == NULL) && (alloc_len > 0))
1111                         return False;
1112
1113                 p = (unsigned char *)str->buffer;
1114
1115                 len = 0;
1116                 /* the (len < alloc_len) test is to prevent us from overwriting
1117                    memory that is not ours...if we get that far, we have a non-null
1118                    terminated string in the buffer and have messed up somewhere */
1119                 while ((len < alloc_len) && (*(uint16 *)q != 0))
1120                 {
1121                         if(ps->bigendian_data)
1122                         {
1123                                 /* swap bytes - q is big endian, p is little endian. */
1124                                 p[0] = (unsigned char)q[1];
1125                                 p[1] = (unsigned char)q[0];
1126                                 p += 2;
1127                                 q += 2;
1128                         } else {
1129
1130                                 p[0] = (unsigned char)q[0];
1131                                 p[1] = (unsigned char)q[1];
1132                                 p += 2;
1133                                 q += 2;
1134                         }
1135
1136                         len++;
1137                 }
1138                 if (len < alloc_len)
1139                 {
1140                         /* NULL terminate the UNISTR */
1141                         str->buffer[len++] = '\0';
1142                 }
1143
1144                 DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
1145                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1146                 DEBUG(5, ("\n"));
1147         }
1148
1149         /* set the offset in the prs_struct; 'len' points to the
1150            terminiating NULL in the UNISTR so we need to go one more
1151            uint16 */
1152         ps->data_offset += (len)*2;
1153
1154         return True;
1155 }
1156
1157
1158 /*******************************************************************
1159  Stream a null-terminated string.  len is strlen, and therefore does
1160  not include the null-termination character.
1161  ********************************************************************/
1162
1163 BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1164 {
1165         char *q;
1166         int i;
1167         int len;
1168
1169         if (UNMARSHALLING(ps))
1170                 len = strlen(&ps->data_p[ps->data_offset]);
1171         else
1172                 len = strlen(str);
1173
1174         len = MIN(len, (max_buf_size-1));
1175
1176         q = prs_mem_get(ps, len+1);
1177         if (q == NULL)
1178                 return False;
1179
1180         for(i = 0; i < len; i++) {
1181                 if (UNMARSHALLING(ps))
1182                         str[i] = q[i];
1183                 else
1184                         q[i] = str[i];
1185         }
1186
1187         /* The terminating null. */
1188         str[i] = '\0';
1189
1190         if (MARSHALLING(ps)) {
1191                 q[i] = '\0';
1192         }
1193
1194         ps->data_offset += len+1;
1195
1196         dump_data(5+depth, q, len);
1197
1198         return True;
1199 }
1200
1201 /*******************************************************************
1202  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1203  uint16 should be stored, or gets the size if reading.
1204  ********************************************************************/
1205
1206 BOOL prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1207 {
1208         *offset = ps->data_offset;
1209         if (UNMARSHALLING(ps)) {
1210                 /* reading. */
1211                 return prs_uint16(name, ps, depth, data16);
1212         } else {
1213                 char *q = prs_mem_get(ps, sizeof(uint16));
1214                 if(q ==NULL)
1215                         return False;
1216                 ps->data_offset += sizeof(uint16);
1217         }
1218         return True;
1219 }
1220
1221 /*******************************************************************
1222  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1223  does nothing on reading, as that is already handled by ...._pre()
1224  ********************************************************************/
1225
1226 BOOL prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1227                                 uint32 ptr_uint16, uint32 start_offset)
1228 {
1229         if (MARSHALLING(ps)) {
1230                 /*
1231                  * Writing - temporarily move the offset pointer.
1232                  */
1233                 uint16 data_size = ps->data_offset - start_offset;
1234                 uint32 old_offset = ps->data_offset;
1235
1236                 ps->data_offset = ptr_uint16;
1237                 if(!prs_uint16(name, ps, depth, &data_size)) {
1238                         ps->data_offset = old_offset;
1239                         return False;
1240                 }
1241                 ps->data_offset = old_offset;
1242         } else {
1243                 ps->data_offset = start_offset + (uint32)(*data16);
1244         }
1245         return True;
1246 }
1247
1248 /*******************************************************************
1249  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1250  uint32 should be stored, or gets the size if reading.
1251  ********************************************************************/
1252
1253 BOOL prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1254 {
1255         *offset = ps->data_offset;
1256         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1257                 /* reading. */
1258                 return prs_uint32(name, ps, depth, data32);
1259         } else {
1260                 ps->data_offset += sizeof(uint32);
1261         }
1262         return True;
1263 }
1264
1265 /*******************************************************************
1266  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1267  does nothing on reading, as that is already handled by ...._pre()
1268  ********************************************************************/
1269
1270 BOOL prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1271                                 uint32 ptr_uint32, uint32 data_size)
1272 {
1273         if (MARSHALLING(ps)) {
1274                 /*
1275                  * Writing - temporarily move the offset pointer.
1276                  */
1277                 uint32 old_offset = ps->data_offset;
1278                 ps->data_offset = ptr_uint32;
1279                 if(!prs_uint32(name, ps, depth, &data_size)) {
1280                         ps->data_offset = old_offset;
1281                         return False;
1282                 }
1283                 ps->data_offset = old_offset;
1284         }
1285         return True;
1286 }
1287
1288 /* useful function to store a structure in rpc wire format */
1289 int tdb_prs_store(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
1290 {
1291     TDB_DATA kbuf, dbuf;
1292     kbuf.dptr = keystr;
1293     kbuf.dsize = strlen(keystr)+1;
1294     dbuf.dptr = ps->data_p;
1295     dbuf.dsize = prs_offset(ps);
1296     return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
1297 }
1298
1299 /* useful function to fetch a structure into rpc wire format */
1300 int tdb_prs_fetch(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
1301 {
1302     TDB_DATA kbuf, dbuf;
1303     kbuf.dptr = keystr;
1304     kbuf.dsize = strlen(keystr)+1;
1305
1306     dbuf = tdb_fetch(tdb, kbuf);
1307     if (!dbuf.dptr)
1308             return -1;
1309
1310     prs_init(ps, 0, mem_ctx, UNMARSHALL);
1311     prs_give_memory(ps, dbuf.dptr, dbuf.dsize, True);
1312
1313     return 0;
1314 }
1315
1316 /*******************************************************************
1317  hash a stream.
1318  ********************************************************************/
1319 BOOL prs_hash1(prs_struct *ps, uint32 offset, uint8 sess_key[16], int len)
1320 {
1321         char *q;
1322
1323         q = ps->data_p;
1324         q = &q[offset];
1325
1326 #ifdef DEBUG_PASSWORD
1327         DEBUG(100, ("prs_hash1\n"));
1328         dump_data(100, sess_key, 16);
1329         dump_data(100, q, len);
1330 #endif
1331         SamOEMhash((uchar *) q, sess_key, len);
1332
1333 #ifdef DEBUG_PASSWORD
1334         dump_data(100, q, len);
1335 #endif
1336
1337         return True;
1338 }
1339
1340
1341 /*******************************************************************
1342  Create a digest over the entire packet (including the data), and
1343  MD5 it with the session key.
1344  ********************************************************************/
1345 static void netsec_digest(struct netsec_auth_struct *a,
1346                           int auth_flags,
1347                           RPC_AUTH_NETSEC_CHK * verf,
1348                           char *data, size_t data_len,
1349                           uchar digest_final[16])
1350 {
1351         uchar whole_packet_digest[16];
1352         static uchar zeros[4];
1353         struct MD5Context ctx3;
1354
1355         /* verfiy the signature on the packet by MD5 over various bits */
1356         MD5Init(&ctx3);
1357         /* use our sequence number, which ensures the packet is not
1358            out of order */
1359         MD5Update(&ctx3, zeros, sizeof(zeros));
1360         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1361         if (auth_flags & AUTH_PIPE_SEAL) {
1362                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1363         }
1364         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1365         MD5Final(whole_packet_digest, &ctx3);
1366         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1367
1368         /* MD5 this result and the session key, to prove that
1369            only a valid client could had produced this */
1370         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1371 }
1372
1373 /*******************************************************************
1374  Calculate the key with which to encode the data payload
1375  ********************************************************************/
1376 static void netsec_get_sealing_key(struct netsec_auth_struct *a,
1377                                    RPC_AUTH_NETSEC_CHK *verf,
1378                                    uchar sealing_key[16])
1379 {
1380         static uchar zeros[4];
1381         uchar digest2[16];
1382         uchar sess_kf0[16];
1383         int i;
1384
1385         for (i = 0; i < sizeof(sess_kf0); i++) {
1386                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1387         }
1388
1389         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1390
1391         /* MD5 of sess_kf0 and 4 zero bytes */
1392         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1393         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1394
1395         /* MD5 of the above result, plus 8 bytes of sequence number */
1396         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1397         dump_data_pw("sealing_key:\n", sealing_key, 16);
1398 }
1399
1400 /*******************************************************************
1401  Encode or Decode the sequence number (which is symmetric)
1402  ********************************************************************/
1403 static void netsec_deal_with_seq_num(struct netsec_auth_struct *a,
1404                                      RPC_AUTH_NETSEC_CHK *verf)
1405 {
1406         static uchar zeros[4];
1407         uchar sequence_key[16];
1408         uchar digest1[16];
1409
1410         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1411         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1412
1413         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1414
1415         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1416
1417         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1418         SamOEMhash(verf->seq_num, sequence_key, 8);
1419         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1420 }
1421
1422 /*******************************************************************
1423 creates an RPC_AUTH_NETSEC_CHK structure.
1424 ********************************************************************/
1425 static BOOL init_rpc_auth_netsec_chk(RPC_AUTH_NETSEC_CHK * chk,
1426                               const uchar sig[8],
1427                               const uchar packet_digest[8],
1428                               const uchar seq_num[8], const uchar confounder[8])
1429 {
1430         if (chk == NULL)
1431                 return False;
1432
1433         memcpy(chk->sig, sig, sizeof(chk->sig));
1434         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1435         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1436         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1437
1438         return True;
1439 }
1440
1441
1442 /*******************************************************************
1443  Encode a blob of data using the netsec (schannel) alogrithm, also produceing
1444  a checksum over the original data.  We currently only support
1445  signing and sealing togeather - the signing-only code is close, but not
1446  quite compatible with what MS does.
1447  ********************************************************************/
1448 void netsec_encode(struct netsec_auth_struct *a, int auth_flags,
1449                    enum netsec_direction direction,
1450                    RPC_AUTH_NETSEC_CHK * verf,
1451                    char *data, size_t data_len)
1452 {
1453         uchar digest_final[16];
1454         uchar confounder[8];
1455         uchar seq_num[8];
1456         static const uchar nullbytes[8];
1457
1458         static const uchar netsec_seal_sig[8] = NETSEC_SEAL_SIGNATURE;
1459         static const uchar netsec_sign_sig[8] = NETSEC_SIGN_SIGNATURE;
1460         const uchar *netsec_sig = NULL;
1461
1462         DEBUG(10,("SCHANNEL: netsec_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1463
1464         if (auth_flags & AUTH_PIPE_SEAL) {
1465                 netsec_sig = netsec_seal_sig;
1466         } else if (auth_flags & AUTH_PIPE_SIGN) {
1467                 netsec_sig = netsec_sign_sig;
1468         }
1469
1470         /* fill the 'confounder' with random data */
1471         generate_random_buffer(confounder, sizeof(confounder), False);
1472
1473         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1474
1475         RSIVAL(seq_num, 0, a->seq_num);
1476
1477         switch (direction) {
1478         case SENDER_IS_INITIATOR:
1479                 SIVAL(seq_num, 4, 0x80);
1480                 break;
1481         case SENDER_IS_ACCEPTOR:
1482                 SIVAL(seq_num, 4, 0x0);
1483                 break;
1484         }
1485
1486         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1487
1488         init_rpc_auth_netsec_chk(verf, netsec_sig, nullbytes,
1489                                  seq_num, confounder);
1490
1491         /* produce a digest of the packet to prove it's legit (before we seal it) */
1492         netsec_digest(a, auth_flags, verf, data, data_len, digest_final);
1493         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1494
1495         if (auth_flags & AUTH_PIPE_SEAL) {
1496                 uchar sealing_key[16];
1497
1498                 /* get the key to encode the data with */
1499                 netsec_get_sealing_key(a, verf, sealing_key);
1500
1501                 /* encode the verification data */
1502                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1503                 SamOEMhash(verf->confounder, sealing_key, 8);
1504
1505                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1506
1507                 /* encode the packet payload */
1508                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1509                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1510                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1511         }
1512
1513         /* encode the sequence number (key based on packet digest) */
1514         /* needs to be done after the sealing, as the original version
1515            is used in the sealing stuff... */
1516         netsec_deal_with_seq_num(a, verf);
1517
1518         return;
1519 }
1520
1521 /*******************************************************************
1522  Decode a blob of data using the netsec (schannel) alogrithm, also verifiying
1523  a checksum over the original data.  We currently can verify signed messages,
1524  as well as decode sealed messages
1525  ********************************************************************/
1526
1527 BOOL netsec_decode(struct netsec_auth_struct *a, int auth_flags,
1528                    enum netsec_direction direction,
1529                    RPC_AUTH_NETSEC_CHK * verf, char *data, size_t data_len)
1530 {
1531         uchar digest_final[16];
1532
1533         static const uchar netsec_seal_sig[8] = NETSEC_SEAL_SIGNATURE;
1534         static const uchar netsec_sign_sig[8] = NETSEC_SIGN_SIGNATURE;
1535         const uchar *netsec_sig = NULL;
1536
1537         uchar seq_num[8];
1538
1539         DEBUG(10,("SCHANNEL: netsec_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1540
1541         if (auth_flags & AUTH_PIPE_SEAL) {
1542                 netsec_sig = netsec_seal_sig;
1543         } else if (auth_flags & AUTH_PIPE_SIGN) {
1544                 netsec_sig = netsec_sign_sig;
1545         }
1546
1547         /* Create the expected sequence number for comparison */
1548         RSIVAL(seq_num, 0, a->seq_num);
1549
1550         switch (direction) {
1551         case SENDER_IS_INITIATOR:
1552                 SIVAL(seq_num, 4, 0x80);
1553                 break;
1554         case SENDER_IS_ACCEPTOR:
1555                 SIVAL(seq_num, 4, 0x0);
1556                 break;
1557         }
1558
1559         DEBUG(10,("SCHANNEL: netsec_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1560         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1561
1562         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1563
1564         /* extract the sequence number (key based on supplied packet digest) */
1565         /* needs to be done before the sealing, as the original version
1566            is used in the sealing stuff... */
1567         netsec_deal_with_seq_num(a, verf);
1568
1569         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1570                 /* don't even bother with the below if the sequence number is out */
1571                 /* The sequence number is MD5'ed with a key based on the whole-packet
1572                    digest, as supplied by the client.  We check that it's a valid
1573                    checksum after the decode, below
1574                 */
1575                 DEBUG(2, ("netsec_decode: FAILED: packet sequence number:\n"));
1576                 dump_data(2, (const char*)verf->seq_num, sizeof(verf->seq_num));
1577                 DEBUG(2, ("should be:\n"));
1578                 dump_data(2, (const char*)seq_num, sizeof(seq_num));
1579
1580                 return False;
1581         }
1582
1583         if (memcmp(verf->sig, netsec_sig, sizeof(verf->sig))) {
1584                 /* Validate that the other end sent the expected header */
1585                 DEBUG(2, ("netsec_decode: FAILED: packet header:\n"));
1586                 dump_data(2, (const char*)verf->sig, sizeof(verf->sig));
1587                 DEBUG(2, ("should be:\n"));
1588                 dump_data(2, (const char*)netsec_sig, sizeof(netsec_sig));
1589                 return False;
1590         }
1591
1592         if (auth_flags & AUTH_PIPE_SEAL) {
1593                 uchar sealing_key[16];
1594
1595                 /* get the key to extract the data with */
1596                 netsec_get_sealing_key(a, verf, sealing_key);
1597
1598                 /* extract the verification data */
1599                 dump_data_pw("verf->confounder:\n", verf->confounder,
1600                              sizeof(verf->confounder));
1601                 SamOEMhash(verf->confounder, sealing_key, 8);
1602
1603                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1604                              sizeof(verf->confounder));
1605
1606                 /* extract the packet payload */
1607                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1608                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1609                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1610         }
1611
1612         /* digest includes 'data' after unsealing */
1613         netsec_digest(a, auth_flags, verf, data, data_len, digest_final);
1614
1615         dump_data_pw("Calculated digest:\n", digest_final,
1616                      sizeof(digest_final));
1617         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1618                      sizeof(verf->packet_digest));
1619
1620         /* compare - if the client got the same result as us, then
1621            it must know the session key */
1622         return (memcmp(digest_final, verf->packet_digest,
1623                        sizeof(verf->packet_digest)) == 0);
1624 }