acc0cc88efd614d0fd002cf94175c9ec06b2953b
[kai/samba.git] / 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 3 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, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24
25 #undef DBGC_CLASS
26 #define DBGC_CLASS DBGC_RPC_PARSE
27
28 /**
29  * Dump a prs to a file: from the current location through to the end.
30  **/
31 void prs_dump(const char *name, int v, prs_struct *ps)
32 {
33         prs_dump_region(name, v, ps, ps->data_offset, ps->buffer_size);
34 }
35
36 /**
37  * Dump from the start of the prs to the current location.
38  **/
39 void prs_dump_before(const char *name, int v, prs_struct *ps)
40 {
41         prs_dump_region(name, v, ps, 0, ps->data_offset);
42 }
43
44 /**
45  * Dump everything from the start of the prs up to the current location.
46  **/
47 void prs_dump_region(const char *name, int v, prs_struct *ps,
48                      int from_off, int to_off)
49 {
50         int fd, i;
51         char *fname = NULL;
52         ssize_t sz;
53         if (DEBUGLEVEL < 50) return;
54         for (i=1;i<100;i++) {
55                 if (v != -1) {
56                         if (asprintf(&fname,"/tmp/%s_%d.%d.prs", name, v, i) < 0) {
57                                 return;
58                         }
59                 } else {
60                         if (asprintf(&fname,"/tmp/%s.%d.prs", name, i) < 0) {
61                                 return;
62                         }
63                 }
64                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
65                 if (fd != -1 || errno != EEXIST) break;
66         }
67         if (fd != -1) {
68                 sz = write(fd, ps->data_p + from_off, to_off - from_off);
69                 i = close(fd);
70                 if ( (sz != to_off-from_off) || (i != 0) ) {
71                         DEBUG(0,("Error writing/closing %s: %ld!=%ld %d\n", fname, (unsigned long)sz, (unsigned long)to_off-from_off, i ));
72                 } else {
73                         DEBUG(0,("created %s\n", fname));
74                 }
75         }
76         SAFE_FREE(fname);
77 }
78
79 /*******************************************************************
80  Debug output for parsing info
81
82  XXXX side-effect of this function is to increase the debug depth XXXX.
83
84 ********************************************************************/
85
86 void prs_debug(prs_struct *ps, int depth, const char *desc, const char *fn_name)
87 {
88         DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(5+depth,depth), ps->data_offset, fn_name, desc));
89 }
90
91 /**
92  * Initialise an expandable parse structure.
93  *
94  * @param size Initial buffer size.  If >0, a new buffer will be
95  * created with malloc().
96  *
97  * @return False if allocation fails, otherwise True.
98  **/
99
100 bool prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, bool io)
101 {
102         ZERO_STRUCTP(ps);
103         ps->io = io;
104         ps->bigendian_data = RPC_LITTLE_ENDIAN;
105         ps->align = RPC_PARSE_ALIGN;
106         ps->is_dynamic = False;
107         ps->data_offset = 0;
108         ps->buffer_size = 0;
109         ps->data_p = NULL;
110         ps->mem_ctx = ctx;
111
112         if (size != 0) {
113                 ps->buffer_size = size;
114                 if((ps->data_p = (char *)SMB_MALLOC((size_t)size)) == NULL) {
115                         DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
116                         return False;
117                 }
118                 memset(ps->data_p, '\0', (size_t)size);
119                 ps->is_dynamic = True; /* We own this memory. */
120         } else if (MARSHALLING(ps)) {
121                 /* If size is zero and we're marshalling we should allocate memory on demand. */
122                 ps->is_dynamic = True;
123         }
124
125         return True;
126 }
127
128 /*******************************************************************
129  Delete the memory in a parse structure - if we own it.
130
131  NOTE: Contrary to the somewhat confusing naming, this function is not
132        intended for freeing memory allocated by prs_alloc_mem().  That memory
133        is attached to the talloc context given by ps->mem_ctx.
134  ********************************************************************/
135
136 void prs_mem_free(prs_struct *ps)
137 {
138         if(ps->is_dynamic)
139                 SAFE_FREE(ps->data_p);
140         ps->is_dynamic = False;
141         ps->buffer_size = 0;
142         ps->data_offset = 0;
143 }
144
145 /*******************************************************************
146  Clear the memory in a parse structure.
147  ********************************************************************/
148
149 void prs_mem_clear(prs_struct *ps)
150 {
151         if (ps->buffer_size)
152                 memset(ps->data_p, '\0', (size_t)ps->buffer_size);
153 }
154
155 /*******************************************************************
156  Allocate memory when unmarshalling... Always zero clears.
157  ********************************************************************/
158
159 #if defined(PARANOID_MALLOC_CHECKER)
160 char *prs_alloc_mem_(prs_struct *ps, size_t size, unsigned int count)
161 #else
162 char *prs_alloc_mem(prs_struct *ps, size_t size, unsigned int count)
163 #endif
164 {
165         char *ret = NULL;
166
167         if (size && count) {
168                 /* We can't call the type-safe version here. */
169                 ret = (char *)_talloc_zero_array(ps->mem_ctx, size, count,
170                                                  "parse_prs");
171         }
172         return ret;
173 }
174
175 /*******************************************************************
176  Return the current talloc context we're using.
177  ********************************************************************/
178
179 TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
180 {
181         return ps->mem_ctx;
182 }
183
184 /*******************************************************************
185  Hand some already allocated memory to a prs_struct.
186  ********************************************************************/
187
188 void prs_give_memory(prs_struct *ps, char *buf, uint32 size, bool is_dynamic)
189 {
190         ps->is_dynamic = is_dynamic;
191         ps->data_p = buf;
192         ps->buffer_size = size;
193 }
194
195 /*******************************************************************
196  Take some memory back from a prs_struct.
197  ********************************************************************/
198
199 char *prs_take_memory(prs_struct *ps, uint32 *psize)
200 {
201         char *ret = ps->data_p;
202         if(psize)
203                 *psize = ps->buffer_size;
204         ps->is_dynamic = False;
205         prs_mem_free(ps);
206         return ret;
207 }
208
209 /*******************************************************************
210  Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
211  ********************************************************************/
212
213 bool prs_set_buffer_size(prs_struct *ps, uint32 newsize)
214 {
215         if (newsize > ps->buffer_size)
216                 return prs_force_grow(ps, newsize - ps->buffer_size);
217
218         if (newsize < ps->buffer_size) {
219                 ps->buffer_size = newsize;
220
221                 /* newsize == 0 acts as a free and set pointer to NULL */
222                 if (newsize == 0) {
223                         SAFE_FREE(ps->data_p);
224                 } else {
225                         ps->data_p = (char *)SMB_REALLOC(ps->data_p, newsize);
226
227                         if (ps->data_p == NULL) {
228                                 DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
229                                         (unsigned int)newsize));
230                                 DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
231                                 return False;
232                         }
233                 }
234         }
235
236         return True;
237 }
238
239 /*******************************************************************
240  Attempt, if needed, to grow a data buffer.
241  Also depends on the data stream mode (io).
242  ********************************************************************/
243
244 bool prs_grow(prs_struct *ps, uint32 extra_space)
245 {
246         uint32 new_size;
247
248         ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
249
250         if(ps->data_offset + extra_space <= ps->buffer_size)
251                 return True;
252
253         /*
254          * We cannot grow the buffer if we're not reading
255          * into the prs_struct, or if we don't own the memory.
256          */
257
258         if(UNMARSHALLING(ps) || !ps->is_dynamic) {
259                 DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
260                                 (unsigned int)extra_space));
261                 return False;
262         }
263         
264         /*
265          * Decide how much extra space we really need.
266          */
267
268         extra_space -= (ps->buffer_size - ps->data_offset);
269         if(ps->buffer_size == 0) {
270                 /*
271                  * Ensure we have at least a PDU's length, or extra_space, whichever
272                  * is greater.
273                  */
274
275                 new_size = MAX(RPC_MAX_PDU_FRAG_LEN,extra_space);
276
277                 if((ps->data_p = (char *)SMB_MALLOC(new_size)) == NULL) {
278                         DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
279                         return False;
280                 }
281                 memset(ps->data_p, '\0', (size_t)new_size );
282         } else {
283                 /*
284                  * If the current buffer size is bigger than the space needed, just 
285                  * double it, else add extra_space.
286                  */
287                 new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);               
288
289                 if ((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
290                         DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
291                                 (unsigned int)new_size));
292                         return False;
293                 }
294
295                 memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
296         }
297         ps->buffer_size = new_size;
298
299         return True;
300 }
301
302 /*******************************************************************
303  Attempt to force a data buffer to grow by len bytes.
304  This is only used when appending more data onto a prs_struct
305  when reading an rpc reply, before unmarshalling it.
306  ********************************************************************/
307
308 bool prs_force_grow(prs_struct *ps, uint32 extra_space)
309 {
310         uint32 new_size = ps->buffer_size + extra_space;
311
312         if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
313                 DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
314                                 (unsigned int)extra_space));
315                 return False;
316         }
317
318         if((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
319                 DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
320                         (unsigned int)new_size));
321                 return False;
322         }
323
324         memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
325
326         ps->buffer_size = new_size;
327
328         return True;
329 }
330
331 /*******************************************************************
332  Get the data pointer (external interface).
333 ********************************************************************/
334
335 char *prs_data_p(prs_struct *ps)
336 {
337         return ps->data_p;
338 }
339
340 /*******************************************************************
341  Get the current data size (external interface).
342  ********************************************************************/
343
344 uint32 prs_data_size(prs_struct *ps)
345 {
346         return ps->buffer_size;
347 }
348
349 /*******************************************************************
350  Fetch the current offset (external interface).
351  ********************************************************************/
352
353 uint32 prs_offset(prs_struct *ps)
354 {
355         return ps->data_offset;
356 }
357
358 /*******************************************************************
359  Set the current offset (external interface).
360  ********************************************************************/
361
362 bool prs_set_offset(prs_struct *ps, uint32 offset)
363 {
364         if(offset <= ps->data_offset) {
365                 ps->data_offset = offset;
366                 return True;
367         }
368
369         if(!prs_grow(ps, offset - ps->data_offset))
370                 return False;
371
372         ps->data_offset = offset;
373         return True;
374 }
375
376 /*******************************************************************
377  Append the data from one parse_struct into another.
378  ********************************************************************/
379
380 bool prs_append_prs_data(prs_struct *dst, prs_struct *src)
381 {
382         if (prs_offset(src) == 0)
383                 return True;
384
385         if(!prs_grow(dst, prs_offset(src)))
386                 return False;
387
388         memcpy(&dst->data_p[dst->data_offset], src->data_p, (size_t)prs_offset(src));
389         dst->data_offset += prs_offset(src);
390
391         return True;
392 }
393
394 /*******************************************************************
395  Append some data from one parse_struct into another.
396  ********************************************************************/
397
398 bool prs_append_some_data(prs_struct *dst, void *src_base, uint32_t start,
399                           uint32_t len)
400 {
401         if (len == 0) {
402                 return true;
403         }
404
405         if(!prs_grow(dst, len)) {
406                 return false;
407         }
408
409         memcpy(&dst->data_p[dst->data_offset], ((char *)src_base) + start, (size_t)len);
410         dst->data_offset += len;
411         return true;
412 }
413
414 bool prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start,
415                               uint32 len)
416 {
417         return prs_append_some_data(dst, src->data_p, start, len);
418 }
419
420 /*******************************************************************
421  Append the data from a buffer into a parse_struct.
422  ********************************************************************/
423
424 bool prs_copy_data_in(prs_struct *dst, const char *src, uint32 len)
425 {
426         if (len == 0)
427                 return True;
428
429         if(!prs_grow(dst, len))
430                 return False;
431
432         memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
433         dst->data_offset += len;
434
435         return True;
436 }
437
438 /*******************************************************************
439  Copy some data from a parse_struct into a buffer.
440  ********************************************************************/
441
442 bool prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
443 {
444         if (len == 0)
445                 return True;
446
447         if(!prs_mem_get(src, len))
448                 return False;
449
450         memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
451         src->data_offset += len;
452
453         return True;
454 }
455
456 /*******************************************************************
457  Copy all the data from a parse_struct into a buffer.
458  ********************************************************************/
459
460 bool prs_copy_all_data_out(char *dst, prs_struct *src)
461 {
462         uint32 len = prs_offset(src);
463
464         if (!len)
465                 return True;
466
467         prs_set_offset(src, 0);
468         return prs_copy_data_out(dst, src, len);
469 }
470
471 /*******************************************************************
472  Set the data as X-endian (external interface).
473  ********************************************************************/
474
475 void prs_set_endian_data(prs_struct *ps, bool endian)
476 {
477         ps->bigendian_data = endian;
478 }
479
480 /*******************************************************************
481  Align a the data_len to a multiple of align bytes - filling with
482  zeros.
483  ********************************************************************/
484
485 bool prs_align(prs_struct *ps)
486 {
487         uint32 mod = ps->data_offset & (ps->align-1);
488
489         if (ps->align != 0 && mod != 0) {
490                 uint32 extra_space = (ps->align - mod);
491                 if(!prs_grow(ps, extra_space))
492                         return False;
493                 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
494                 ps->data_offset += extra_space;
495         }
496
497         return True;
498 }
499
500 /******************************************************************
501  Align on a 2 byte boundary
502  *****************************************************************/
503  
504 bool prs_align_uint16(prs_struct *ps)
505 {
506         bool ret;
507         uint8 old_align = ps->align;
508
509         ps->align = 2;
510         ret = prs_align(ps);
511         ps->align = old_align;
512         
513         return ret;
514 }
515
516 /******************************************************************
517  Align on a 8 byte boundary
518  *****************************************************************/
519  
520 bool prs_align_uint64(prs_struct *ps)
521 {
522         bool ret;
523         uint8 old_align = ps->align;
524
525         ps->align = 8;
526         ret = prs_align(ps);
527         ps->align = old_align;
528         
529         return ret;
530 }
531
532 /******************************************************************
533  Align on a specific byte boundary
534  *****************************************************************/
535  
536 bool prs_align_custom(prs_struct *ps, uint8 boundary)
537 {
538         bool ret;
539         uint8 old_align = ps->align;
540
541         ps->align = boundary;
542         ret = prs_align(ps);
543         ps->align = old_align;
544         
545         return ret;
546 }
547
548
549
550 /*******************************************************************
551  Align only if required (for the unistr2 string mainly)
552  ********************************************************************/
553
554 bool prs_align_needed(prs_struct *ps, uint32 needed)
555 {
556         if (needed==0)
557                 return True;
558         else
559                 return prs_align(ps);
560 }
561
562 /*******************************************************************
563  Ensure we can read/write to a given offset.
564  ********************************************************************/
565
566 char *prs_mem_get(prs_struct *ps, uint32 extra_size)
567 {
568         if(UNMARSHALLING(ps)) {
569                 /*
570                  * If reading, ensure that we can read the requested size item.
571                  */
572                 if (ps->data_offset + extra_size > ps->buffer_size) {
573                         DEBUG(0,("prs_mem_get: reading data of size %u would overrun "
574                                 "buffer by %u bytes.\n",
575                                 (unsigned int)extra_size,
576                                 (unsigned int)(ps->data_offset + extra_size - ps->buffer_size) ));
577                         return NULL;
578                 }
579         } else {
580                 /*
581                  * Writing - grow the buffer if needed.
582                  */
583                 if(!prs_grow(ps, extra_size))
584                         return NULL;
585         }
586         return &ps->data_p[ps->data_offset];
587 }
588
589 /*******************************************************************
590  Change the struct type.
591  ********************************************************************/
592
593 void prs_switch_type(prs_struct *ps, bool io)
594 {
595         if ((ps->io ^ io) == True)
596                 ps->io=io;
597 }
598
599 /*******************************************************************
600  Force a prs_struct to be dynamic even when it's size is 0.
601  ********************************************************************/
602
603 void prs_force_dynamic(prs_struct *ps)
604 {
605         ps->is_dynamic=True;
606 }
607
608 /*******************************************************************
609  Associate a session key with a parse struct.
610  ********************************************************************/
611
612 void prs_set_session_key(prs_struct *ps, const char sess_key[16])
613 {
614         ps->sess_key = sess_key;
615 }
616
617 /*******************************************************************
618  Stream a uint8.
619  ********************************************************************/
620
621 bool prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
622 {
623         char *q = prs_mem_get(ps, 1);
624         if (q == NULL)
625                 return False;
626
627         if (UNMARSHALLING(ps))
628                 *data8 = CVAL(q,0);
629         else
630                 SCVAL(q,0,*data8);
631
632         DEBUG(5,("%s%04x %s: %02x\n", tab_depth(5,depth), ps->data_offset, name, *data8));
633
634         ps->data_offset += 1;
635
636         return True;
637 }
638
639 /*******************************************************************
640  Stream a uint16* (allocate memory if unmarshalling)
641  ********************************************************************/
642
643 bool prs_pointer( const char *name, prs_struct *ps, int depth, 
644                  void *dta, size_t data_size,
645                  bool (*prs_fn)(const char*, prs_struct*, int, void*) )
646 {
647         void ** data = (void **)dta;
648         uint32 data_p;
649
650         /* output f000baaa to stream if the pointer is non-zero. */
651
652         data_p = *data ? 0xf000baaa : 0;
653
654         if ( !prs_uint32("ptr", ps, depth, &data_p ))
655                 return False;
656
657         /* we're done if there is no data */
658
659         if ( !data_p )
660                 return True;
661
662         if (UNMARSHALLING(ps)) {
663                 if (data_size) {
664                         if ( !(*data = PRS_ALLOC_MEM(ps, char, data_size)) )
665                                 return False;
666                 } else {
667                         *data = NULL;
668                 }
669         }
670
671         return prs_fn(name, ps, depth, *data);
672 }
673
674
675 /*******************************************************************
676  Stream a uint16.
677  ********************************************************************/
678
679 bool prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
680 {
681         char *q = prs_mem_get(ps, sizeof(uint16));
682         if (q == NULL)
683                 return False;
684
685         if (UNMARSHALLING(ps)) {
686                 if (ps->bigendian_data)
687                         *data16 = RSVAL(q,0);
688                 else
689                         *data16 = SVAL(q,0);
690         } else {
691                 if (ps->bigendian_data)
692                         RSSVAL(q,0,*data16);
693                 else
694                         SSVAL(q,0,*data16);
695         }
696
697         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(5,depth), ps->data_offset, name, *data16));
698
699         ps->data_offset += sizeof(uint16);
700
701         return True;
702 }
703
704 /*******************************************************************
705  Stream a uint32.
706  ********************************************************************/
707
708 bool prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
709 {
710         char *q = prs_mem_get(ps, sizeof(uint32));
711         if (q == NULL)
712                 return False;
713
714         if (UNMARSHALLING(ps)) {
715                 if (ps->bigendian_data)
716                         *data32 = RIVAL(q,0);
717                 else
718                         *data32 = IVAL(q,0);
719         } else {
720                 if (ps->bigendian_data)
721                         RSIVAL(q,0,*data32);
722                 else
723                         SIVAL(q,0,*data32);
724         }
725
726         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
727
728         ps->data_offset += sizeof(uint32);
729
730         return True;
731 }
732
733 /*******************************************************************
734  Stream an int32.
735  ********************************************************************/
736
737 bool prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
738 {
739         char *q = prs_mem_get(ps, sizeof(int32));
740         if (q == NULL)
741                 return False;
742
743         if (UNMARSHALLING(ps)) {
744                 if (ps->bigendian_data)
745                         *data32 = RIVALS(q,0);
746                 else
747                         *data32 = IVALS(q,0);
748         } else {
749                 if (ps->bigendian_data)
750                         RSIVALS(q,0,*data32);
751                 else
752                         SIVALS(q,0,*data32);
753         }
754
755         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
756
757         ps->data_offset += sizeof(int32);
758
759         return True;
760 }
761
762 /*******************************************************************
763  Stream a NTSTATUS
764  ********************************************************************/
765
766 bool prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
767 {
768         char *q = prs_mem_get(ps, sizeof(uint32));
769         if (q == NULL)
770                 return False;
771
772         if (UNMARSHALLING(ps)) {
773                 if (ps->bigendian_data)
774                         *status = NT_STATUS(RIVAL(q,0));
775                 else
776                         *status = NT_STATUS(IVAL(q,0));
777         } else {
778                 if (ps->bigendian_data)
779                         RSIVAL(q,0,NT_STATUS_V(*status));
780                 else
781                         SIVAL(q,0,NT_STATUS_V(*status));
782         }
783
784         DEBUG(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name, 
785                  nt_errstr(*status)));
786
787         ps->data_offset += sizeof(uint32);
788
789         return True;
790 }
791
792 /*******************************************************************
793  Stream a DCE error code
794  ********************************************************************/
795
796 bool prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
797 {
798         char *q = prs_mem_get(ps, sizeof(uint32));
799         if (q == NULL)
800                 return False;
801
802         if (UNMARSHALLING(ps)) {
803                 if (ps->bigendian_data)
804                         *status = NT_STATUS(RIVAL(q,0));
805                 else
806                         *status = NT_STATUS(IVAL(q,0));
807         } else {
808                 if (ps->bigendian_data)
809                         RSIVAL(q,0,NT_STATUS_V(*status));
810                 else
811                         SIVAL(q,0,NT_STATUS_V(*status));
812         }
813
814         DEBUG(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name, 
815                  dcerpc_errstr(debug_ctx(), NT_STATUS_V(*status))));
816
817         ps->data_offset += sizeof(uint32);
818
819         return True;
820 }
821
822
823 /*******************************************************************
824  Stream a WERROR
825  ********************************************************************/
826
827 bool prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
828 {
829         char *q = prs_mem_get(ps, sizeof(uint32));
830         if (q == NULL)
831                 return False;
832
833         if (UNMARSHALLING(ps)) {
834                 if (ps->bigendian_data)
835                         *status = W_ERROR(RIVAL(q,0));
836                 else
837                         *status = W_ERROR(IVAL(q,0));
838         } else {
839                 if (ps->bigendian_data)
840                         RSIVAL(q,0,W_ERROR_V(*status));
841                 else
842                         SIVAL(q,0,W_ERROR_V(*status));
843         }
844
845         DEBUG(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name, 
846                  win_errstr(*status)));
847
848         ps->data_offset += sizeof(uint32);
849
850         return True;
851 }
852
853
854 /******************************************************************
855  Stream an array of uint8s. Length is number of uint8s.
856  ********************************************************************/
857
858 bool prs_uint8s(bool charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
859 {
860         int i;
861         char *q = prs_mem_get(ps, len);
862         if (q == NULL)
863                 return False;
864
865         if (UNMARSHALLING(ps)) {
866                 for (i = 0; i < len; i++)
867                         data8s[i] = CVAL(q,i);
868         } else {
869                 for (i = 0; i < len; i++)
870                         SCVAL(q, i, data8s[i]);
871         }
872
873         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset ,name));
874         if (charmode)
875                 print_asc(5, (unsigned char*)data8s, len);
876         else {
877                 for (i = 0; i < len; i++)
878                         DEBUG(5,("%02x ", data8s[i]));
879         }
880         DEBUG(5,("\n"));
881
882         ps->data_offset += len;
883
884         return True;
885 }
886
887 /******************************************************************
888  Stream an array of uint16s. Length is number of uint16s.
889  ********************************************************************/
890
891 bool prs_uint16s(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
892 {
893         int i;
894         char *q = prs_mem_get(ps, len * sizeof(uint16));
895         if (q == NULL)
896                 return False;
897
898         if (UNMARSHALLING(ps)) {
899                 if (ps->bigendian_data) {
900                         for (i = 0; i < len; i++)
901                                 data16s[i] = RSVAL(q, 2*i);
902                 } else {
903                         for (i = 0; i < len; i++)
904                                 data16s[i] = SVAL(q, 2*i);
905                 }
906         } else {
907                 if (ps->bigendian_data) {
908                         for (i = 0; i < len; i++)
909                                 RSSVAL(q, 2*i, data16s[i]);
910                 } else {
911                         for (i = 0; i < len; i++)
912                                 SSVAL(q, 2*i, data16s[i]);
913                 }
914         }
915
916         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
917         if (charmode)
918                 print_asc(5, (unsigned char*)data16s, 2*len);
919         else {
920                 for (i = 0; i < len; i++)
921                         DEBUG(5,("%04x ", data16s[i]));
922         }
923         DEBUG(5,("\n"));
924
925         ps->data_offset += (len * sizeof(uint16));
926
927         return True;
928 }
929
930 /******************************************************************
931  Start using a function for streaming unicode chars. If unmarshalling,
932  output must be little-endian, if marshalling, input must be little-endian.
933  ********************************************************************/
934
935 static void dbg_rw_punival(bool charmode, const char *name, int depth, prs_struct *ps,
936                                                         char *in_buf, char *out_buf, int len)
937 {
938         int i;
939
940         if (UNMARSHALLING(ps)) {
941                 if (ps->bigendian_data) {
942                         for (i = 0; i < len; i++)
943                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
944                 } else {
945                         for (i = 0; i < len; i++)
946                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
947                 }
948         } else {
949                 if (ps->bigendian_data) {
950                         for (i = 0; i < len; i++)
951                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
952                 } else {
953                         for (i = 0; i < len; i++)
954                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
955                 }
956         }
957
958         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
959         if (charmode)
960                 print_asc(5, (unsigned char*)out_buf, 2*len);
961         else {
962                 for (i = 0; i < len; i++)
963                         DEBUG(5,("%04x ", out_buf[i]));
964         }
965         DEBUG(5,("\n"));
966 }
967
968 /******************************************************************
969  Stream a unistr. Always little endian.
970  ********************************************************************/
971
972 bool prs_uint16uni(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
973 {
974         char *q = prs_mem_get(ps, len * sizeof(uint16));
975         if (q == NULL)
976                 return False;
977
978         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
979         ps->data_offset += (len * sizeof(uint16));
980
981         return True;
982 }
983
984 /******************************************************************
985  Stream an array of uint32s. Length is number of uint32s.
986  ********************************************************************/
987
988 bool prs_uint32s(bool charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
989 {
990         int i;
991         char *q = prs_mem_get(ps, len * sizeof(uint32));
992         if (q == NULL)
993                 return False;
994
995         if (UNMARSHALLING(ps)) {
996                 if (ps->bigendian_data) {
997                         for (i = 0; i < len; i++)
998                                 data32s[i] = RIVAL(q, 4*i);
999                 } else {
1000                         for (i = 0; i < len; i++)
1001                                 data32s[i] = IVAL(q, 4*i);
1002                 }
1003         } else {
1004                 if (ps->bigendian_data) {
1005                         for (i = 0; i < len; i++)
1006                                 RSIVAL(q, 4*i, data32s[i]);
1007                 } else {
1008                         for (i = 0; i < len; i++)
1009                                 SIVAL(q, 4*i, data32s[i]);
1010                 }
1011         }
1012
1013         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1014         if (charmode)
1015                 print_asc(5, (unsigned char*)data32s, 4*len);
1016         else {
1017                 for (i = 0; i < len; i++)
1018                         DEBUG(5,("%08x ", data32s[i]));
1019         }
1020         DEBUG(5,("\n"));
1021
1022         ps->data_offset += (len * sizeof(uint32));
1023
1024         return True;
1025 }
1026
1027 /******************************************************************
1028  Stream an array of unicode string, length/buffer specified separately,
1029  in uint16 chars. The unicode string is already in little-endian format.
1030  ********************************************************************/
1031
1032 bool prs_buffer5(bool charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
1033 {
1034         char *p;
1035         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
1036         if (q == NULL)
1037                 return False;
1038
1039         /* If the string is empty, we don't have anything to stream */
1040         if (str->buf_len==0)
1041                 return True;
1042
1043         if (UNMARSHALLING(ps)) {
1044                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
1045                 if (str->buffer == NULL)
1046                         return False;
1047         }
1048
1049         p = (char *)str->buffer;
1050
1051         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
1052         
1053         ps->data_offset += (str->buf_len * sizeof(uint16));
1054
1055         return True;
1056 }
1057
1058 /******************************************************************
1059  Stream a string, length/buffer specified separately,
1060  in uint8 chars.
1061  ********************************************************************/
1062
1063 bool prs_string2(bool charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
1064 {
1065         unsigned int i;
1066         char *q = prs_mem_get(ps, str->str_str_len);
1067         if (q == NULL)
1068                 return False;
1069
1070         if (UNMARSHALLING(ps)) {
1071                 if (str->str_str_len > str->str_max_len) {
1072                         return False;
1073                 }
1074                 if (str->str_max_len) {
1075                         str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
1076                         if (str->buffer == NULL)
1077                                 return False;
1078                 } else {
1079                         str->buffer = NULL;
1080                         /* Return early to ensure Coverity isn't confused. */
1081                         DEBUG(5,("%s%04x %s: \n", tab_depth(5,depth), ps->data_offset, name));
1082                         return True;
1083                 }
1084         }
1085
1086         if (UNMARSHALLING(ps)) {
1087                 for (i = 0; i < str->str_str_len; i++)
1088                         str->buffer[i] = CVAL(q,i);
1089         } else {
1090                 for (i = 0; i < str->str_str_len; i++)
1091                         SCVAL(q, i, str->buffer[i]);
1092         }
1093
1094         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1095         if (charmode)
1096                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
1097         else {
1098                 for (i = 0; i < str->str_str_len; i++)
1099                         DEBUG(5,("%02x ", str->buffer[i]));
1100         }
1101         DEBUG(5,("\n"));
1102
1103         ps->data_offset += str->str_str_len;
1104
1105         return True;
1106 }
1107
1108 /******************************************************************
1109  Stream a unicode string, length/buffer specified separately,
1110  in uint16 chars. The unicode string is already in little-endian format.
1111  ********************************************************************/
1112
1113 bool prs_unistr2(bool charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1114 {
1115         char *p;
1116         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1117         if (q == NULL)
1118                 return False;
1119
1120         /* If the string is empty, we don't have anything to stream */
1121         if (str->uni_str_len==0)
1122                 return True;
1123
1124         if (UNMARSHALLING(ps)) {
1125                 if (str->uni_str_len > str->uni_max_len) {
1126                         return False;
1127                 }
1128                 if (str->uni_max_len) {
1129                         str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1130                         if (str->buffer == NULL)
1131                                 return False;
1132                 } else {
1133                         str->buffer = NULL;
1134                 }
1135         }
1136
1137         p = (char *)str->buffer;
1138
1139         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1140         
1141         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1142
1143         return True;
1144 }
1145
1146 /******************************************************************
1147  Stream a unicode string, length/buffer specified separately,
1148  in uint16 chars. The unicode string is already in little-endian format.
1149  ********************************************************************/
1150
1151 bool prs_unistr3(bool charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1152 {
1153         char *p;
1154         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1155         if (q == NULL)
1156                 return False;
1157
1158         if (UNMARSHALLING(ps)) {
1159                 if (str->uni_str_len) {
1160                         str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1161                         if (str->str.buffer == NULL)
1162                                 return False;
1163                 } else {
1164                         str->str.buffer = NULL;
1165                 }
1166         }
1167
1168         p = (char *)str->str.buffer;
1169
1170         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1171         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1172
1173         return True;
1174 }
1175
1176 /*******************************************************************
1177  Stream a unicode  null-terminated string. As the string is already
1178  in little-endian format then do it as a stream of bytes.
1179  ********************************************************************/
1180
1181 bool prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1182 {
1183         unsigned int len = 0;
1184         unsigned char *p = (unsigned char *)str->buffer;
1185         uint8 *start;
1186         char *q;
1187         uint32 max_len;
1188         uint16* ptr;
1189
1190         if (MARSHALLING(ps)) {
1191
1192                 for(len = 0; str->buffer[len] != 0; len++)
1193                         ;
1194
1195                 q = prs_mem_get(ps, (len+1)*2);
1196                 if (q == NULL)
1197                         return False;
1198
1199                 start = (uint8*)q;
1200
1201                 for(len = 0; str->buffer[len] != 0; len++) {
1202                         if(ps->bigendian_data) {
1203                                 /* swap bytes - p is little endian, q is big endian. */
1204                                 q[0] = (char)p[1];
1205                                 q[1] = (char)p[0];
1206                                 p += 2;
1207                                 q += 2;
1208                         } 
1209                         else 
1210                         {
1211                                 q[0] = (char)p[0];
1212                                 q[1] = (char)p[1];
1213                                 p += 2;
1214                                 q += 2;
1215                         }
1216                 }
1217
1218                 /*
1219                  * even if the string is 'empty' (only an \0 char)
1220                  * at this point the leading \0 hasn't been parsed.
1221                  * so parse it now
1222                  */
1223
1224                 q[0] = 0;
1225                 q[1] = 0;
1226                 q += 2;
1227
1228                 len++;
1229
1230                 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1231                 print_asc(5, (unsigned char*)start, 2*len);     
1232                 DEBUG(5, ("\n"));
1233         }
1234         else { /* unmarshalling */
1235         
1236                 uint32 alloc_len = 0;
1237                 q = ps->data_p + prs_offset(ps);
1238
1239                 /*
1240                  * Work out how much space we need and talloc it.
1241                  */
1242                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1243
1244                 /* the test of the value of *ptr helps to catch the circumstance
1245                    where we have an emtpty (non-existent) string in the buffer */
1246                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1247                         /* do nothing */ 
1248                         ;
1249
1250                 if (alloc_len < max_len)
1251                         alloc_len += 1;
1252
1253                 /* should we allocate anything at all? */
1254                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1255                 if ((str->buffer == NULL) && (alloc_len > 0))
1256                         return False;
1257
1258                 p = (unsigned char *)str->buffer;
1259
1260                 len = 0;
1261                 /* the (len < alloc_len) test is to prevent us from overwriting
1262                    memory that is not ours...if we get that far, we have a non-null
1263                    terminated string in the buffer and have messed up somewhere */
1264                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1265                         if(ps->bigendian_data) 
1266                         {
1267                                 /* swap bytes - q is big endian, p is little endian. */
1268                                 p[0] = (unsigned char)q[1];
1269                                 p[1] = (unsigned char)q[0];
1270                                 p += 2;
1271                                 q += 2;
1272                         } else {
1273
1274                                 p[0] = (unsigned char)q[0];
1275                                 p[1] = (unsigned char)q[1];
1276                                 p += 2;
1277                                 q += 2;
1278                         }
1279
1280                         len++;
1281                 } 
1282                 if (len < alloc_len) {
1283                         /* NULL terminate the UNISTR */
1284                         str->buffer[len++] = '\0';
1285                 }
1286
1287                 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1288                 print_asc(5, (unsigned char*)str->buffer, 2*len);       
1289                 DEBUG(5, ("\n"));
1290         }
1291
1292         /* set the offset in the prs_struct; 'len' points to the
1293            terminiating NULL in the UNISTR so we need to go one more
1294            uint16 */
1295         ps->data_offset += (len)*2;
1296         
1297         return True;
1298 }
1299
1300
1301 /*******************************************************************
1302  Stream a null-terminated string.  len is strlen, and therefore does
1303  not include the null-termination character.
1304  ********************************************************************/
1305
1306 bool prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1307 {
1308         char *q;
1309         int i;
1310         int len;
1311
1312         if (UNMARSHALLING(ps))
1313                 len = strlen(&ps->data_p[ps->data_offset]);
1314         else
1315                 len = strlen(str);
1316
1317         len = MIN(len, (max_buf_size-1));
1318
1319         q = prs_mem_get(ps, len+1);
1320         if (q == NULL)
1321                 return False;
1322
1323         for(i = 0; i < len; i++) {
1324                 if (UNMARSHALLING(ps))
1325                         str[i] = q[i];
1326                 else
1327                         q[i] = str[i];
1328         }
1329
1330         /* The terminating null. */
1331         str[i] = '\0';
1332
1333         if (MARSHALLING(ps)) {
1334                 q[i] = '\0';
1335         }
1336
1337         ps->data_offset += len+1;
1338
1339         dump_data(5+depth, (uint8 *)q, len);
1340
1341         return True;
1342 }
1343
1344 bool prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str)
1345 {
1346         size_t len;
1347         char *tmp_str;
1348
1349         if (UNMARSHALLING(ps)) {
1350                 len = strlen(&ps->data_p[ps->data_offset]);
1351         } else {
1352                 len = strlen(*str);
1353         }
1354
1355         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1356
1357         if (tmp_str == NULL) {
1358                 return False;
1359         }
1360
1361         if (MARSHALLING(ps)) {
1362                 strncpy(tmp_str, *str, len);
1363         }
1364
1365         if (!prs_string(name, ps, depth, tmp_str, len+1)) {
1366                 return False;
1367         }
1368
1369         *str = tmp_str;
1370         return True;
1371 }
1372
1373 /*******************************************************************
1374  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1375  uint16 should be stored, or gets the size if reading.
1376  ********************************************************************/
1377
1378 bool prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1379 {
1380         *offset = ps->data_offset;
1381         if (UNMARSHALLING(ps)) {
1382                 /* reading. */
1383                 return prs_uint16(name, ps, depth, data16);
1384         } else {
1385                 char *q = prs_mem_get(ps, sizeof(uint16));
1386                 if(q ==NULL)
1387                         return False;
1388                 ps->data_offset += sizeof(uint16);
1389         }
1390         return True;
1391 }
1392
1393 /*******************************************************************
1394  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1395  does nothing on reading, as that is already handled by ...._pre()
1396  ********************************************************************/
1397
1398 bool prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1399                                 uint32 ptr_uint16, uint32 start_offset)
1400 {
1401         if (MARSHALLING(ps)) {
1402                 /* 
1403                  * Writing - temporarily move the offset pointer.
1404                  */
1405                 uint16 data_size = ps->data_offset - start_offset;
1406                 uint32 old_offset = ps->data_offset;
1407
1408                 ps->data_offset = ptr_uint16;
1409                 if(!prs_uint16(name, ps, depth, &data_size)) {
1410                         ps->data_offset = old_offset;
1411                         return False;
1412                 }
1413                 ps->data_offset = old_offset;
1414         } else {
1415                 ps->data_offset = start_offset + (uint32)(*data16);
1416         }
1417         return True;
1418 }
1419
1420 /*******************************************************************
1421  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1422  uint32 should be stored, or gets the size if reading.
1423  ********************************************************************/
1424
1425 bool prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1426 {
1427         *offset = ps->data_offset;
1428         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1429                 /* reading. */
1430                 return prs_uint32(name, ps, depth, data32);
1431         } else {
1432                 ps->data_offset += sizeof(uint32);
1433         }
1434         return True;
1435 }
1436
1437 /*******************************************************************
1438  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1439  does nothing on reading, as that is already handled by ...._pre()
1440  ********************************************************************/
1441
1442 bool prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1443                                 uint32 ptr_uint32, uint32 data_size)
1444 {
1445         if (MARSHALLING(ps)) {
1446                 /* 
1447                  * Writing - temporarily move the offset pointer.
1448                  */
1449                 uint32 old_offset = ps->data_offset;
1450                 ps->data_offset = ptr_uint32;
1451                 if(!prs_uint32(name, ps, depth, &data_size)) {
1452                         ps->data_offset = old_offset;
1453                         return False;
1454                 }
1455                 ps->data_offset = old_offset;
1456         }
1457         return True;
1458 }
1459
1460 /* useful function to store a structure in rpc wire format */
1461 int tdb_prs_store(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps)
1462 {
1463         TDB_DATA dbuf;
1464         dbuf.dptr = (uint8 *)ps->data_p;
1465         dbuf.dsize = prs_offset(ps);
1466         return tdb_trans_store(tdb, kbuf, dbuf, TDB_REPLACE);
1467 }
1468
1469 /* useful function to fetch a structure into rpc wire format */
1470 int tdb_prs_fetch(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps, TALLOC_CTX *mem_ctx)
1471 {
1472         TDB_DATA dbuf;
1473
1474         prs_init_empty(ps, mem_ctx, UNMARSHALL);
1475
1476         dbuf = tdb_fetch(tdb, kbuf);
1477         if (!dbuf.dptr)
1478                 return -1;
1479
1480         prs_give_memory(ps, (char *)dbuf.dptr, dbuf.dsize, True);
1481
1482         return 0;
1483 }
1484
1485 /*******************************************************************
1486  hash a stream.
1487  ********************************************************************/
1488
1489 bool prs_hash1(prs_struct *ps, uint32 offset, int len)
1490 {
1491         char *q;
1492
1493         q = ps->data_p;
1494         q = &q[offset];
1495
1496 #ifdef DEBUG_PASSWORD
1497         DEBUG(100, ("prs_hash1\n"));
1498         dump_data(100, (uint8 *)ps->sess_key, 16);
1499         dump_data(100, (uint8 *)q, len);
1500 #endif
1501         SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len);
1502
1503 #ifdef DEBUG_PASSWORD
1504         dump_data(100, (uint8 *)q, len);
1505 #endif
1506
1507         return True;
1508 }
1509
1510 /*******************************************************************
1511  Create a digest over the entire packet (including the data), and 
1512  MD5 it with the session key.
1513  ********************************************************************/
1514
1515 static void schannel_digest(struct schannel_auth_struct *a,
1516                           enum pipe_auth_level auth_level,
1517                           RPC_AUTH_SCHANNEL_CHK * verf,
1518                           char *data, size_t data_len,
1519                           uchar digest_final[16]) 
1520 {
1521         uchar whole_packet_digest[16];
1522         uchar zeros[4];
1523         struct MD5Context ctx3;
1524
1525         ZERO_STRUCT(zeros);
1526
1527         /* verfiy the signature on the packet by MD5 over various bits */
1528         MD5Init(&ctx3);
1529         /* use our sequence number, which ensures the packet is not
1530            out of order */
1531         MD5Update(&ctx3, zeros, sizeof(zeros));
1532         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1533         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1534                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1535         }
1536         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1537         MD5Final(whole_packet_digest, &ctx3);
1538         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1539         
1540         /* MD5 this result and the session key, to prove that
1541            only a valid client could had produced this */
1542         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1543 }
1544
1545 /*******************************************************************
1546  Calculate the key with which to encode the data payload 
1547  ********************************************************************/
1548
1549 static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1550                                    RPC_AUTH_SCHANNEL_CHK *verf,
1551                                    uchar sealing_key[16]) 
1552 {
1553         uchar zeros[4];
1554         uchar digest2[16];
1555         uchar sess_kf0[16];
1556         int i;
1557
1558         ZERO_STRUCT(zeros);
1559
1560         for (i = 0; i < sizeof(sess_kf0); i++) {
1561                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1562         }
1563         
1564         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1565         
1566         /* MD5 of sess_kf0 and 4 zero bytes */
1567         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1568         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1569         
1570         /* MD5 of the above result, plus 8 bytes of sequence number */
1571         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1572         dump_data_pw("sealing_key:\n", sealing_key, 16);
1573 }
1574
1575 /*******************************************************************
1576  Encode or Decode the sequence number (which is symmetric)
1577  ********************************************************************/
1578
1579 static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1580                                      RPC_AUTH_SCHANNEL_CHK *verf)
1581 {
1582         uchar zeros[4];
1583         uchar sequence_key[16];
1584         uchar digest1[16];
1585
1586         ZERO_STRUCT(zeros);
1587
1588         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1589         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1590
1591         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1592
1593         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1594
1595         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1596         SamOEMhash(verf->seq_num, sequence_key, 8);
1597         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1598 }
1599
1600 /*******************************************************************
1601 creates an RPC_AUTH_SCHANNEL_CHK structure.
1602 ********************************************************************/
1603
1604 static bool init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1605                               const uchar sig[8],
1606                               const uchar packet_digest[8],
1607                               const uchar seq_num[8], const uchar confounder[8])
1608 {
1609         if (chk == NULL)
1610                 return False;
1611
1612         memcpy(chk->sig, sig, sizeof(chk->sig));
1613         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1614         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1615         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1616
1617         return True;
1618 }
1619
1620 /*******************************************************************
1621  Encode a blob of data using the schannel alogrithm, also produceing
1622  a checksum over the original data.  We currently only support
1623  signing and sealing togeather - the signing-only code is close, but not
1624  quite compatible with what MS does.
1625  ********************************************************************/
1626
1627 void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1628                    enum schannel_direction direction,
1629                    RPC_AUTH_SCHANNEL_CHK * verf,
1630                    char *data, size_t data_len)
1631 {
1632         uchar digest_final[16];
1633         uchar confounder[8];
1634         uchar seq_num[8];
1635         static const uchar nullbytes[8] = { 0, };
1636
1637         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1638         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1639         const uchar *schannel_sig = NULL;
1640
1641         DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1642         
1643         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1644                 schannel_sig = schannel_seal_sig;
1645         } else {
1646                 schannel_sig = schannel_sign_sig;
1647         }
1648
1649         /* fill the 'confounder' with random data */
1650         generate_random_buffer(confounder, sizeof(confounder));
1651
1652         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1653
1654         RSIVAL(seq_num, 0, a->seq_num);
1655
1656         switch (direction) {
1657         case SENDER_IS_INITIATOR:
1658                 SIVAL(seq_num, 4, 0x80);
1659                 break;
1660         case SENDER_IS_ACCEPTOR:
1661                 SIVAL(seq_num, 4, 0x0);
1662                 break;
1663         }
1664
1665         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1666
1667         init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1668                                  seq_num, confounder);
1669                                 
1670         /* produce a digest of the packet to prove it's legit (before we seal it) */
1671         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1672         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1673
1674         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1675                 uchar sealing_key[16];
1676
1677                 /* get the key to encode the data with */
1678                 schannel_get_sealing_key(a, verf, sealing_key);
1679
1680                 /* encode the verification data */
1681                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1682                 SamOEMhash(verf->confounder, sealing_key, 8);
1683
1684                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1685                 
1686                 /* encode the packet payload */
1687                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1688                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1689                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1690         }
1691
1692         /* encode the sequence number (key based on packet digest) */
1693         /* needs to be done after the sealing, as the original version 
1694            is used in the sealing stuff... */
1695         schannel_deal_with_seq_num(a, verf);
1696
1697         return;
1698 }
1699
1700 /*******************************************************************
1701  Decode a blob of data using the schannel alogrithm, also verifiying
1702  a checksum over the original data.  We currently can verify signed messages,
1703  as well as decode sealed messages
1704  ********************************************************************/
1705
1706 bool schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1707                    enum schannel_direction direction, 
1708                    RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1709 {
1710         uchar digest_final[16];
1711
1712         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1713         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1714         const uchar *schannel_sig = NULL;
1715
1716         uchar seq_num[8];
1717
1718         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1719         
1720         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1721                 schannel_sig = schannel_seal_sig;
1722         } else {
1723                 schannel_sig = schannel_sign_sig;
1724         }
1725
1726         /* Create the expected sequence number for comparison */
1727         RSIVAL(seq_num, 0, a->seq_num);
1728
1729         switch (direction) {
1730         case SENDER_IS_INITIATOR:
1731                 SIVAL(seq_num, 4, 0x80);
1732                 break;
1733         case SENDER_IS_ACCEPTOR:
1734                 SIVAL(seq_num, 4, 0x0);
1735                 break;
1736         }
1737
1738         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1739         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1740
1741         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1742
1743         /* extract the sequence number (key based on supplied packet digest) */
1744         /* needs to be done before the sealing, as the original version 
1745            is used in the sealing stuff... */
1746         schannel_deal_with_seq_num(a, verf);
1747
1748         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1749                 /* don't even bother with the below if the sequence number is out */
1750                 /* The sequence number is MD5'ed with a key based on the whole-packet
1751                    digest, as supplied by the client.  We check that it's a valid 
1752                    checksum after the decode, below
1753                 */
1754                 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1755                 dump_data(2, verf->seq_num, sizeof(verf->seq_num));
1756                 DEBUG(2, ("should be:\n"));
1757                 dump_data(2, seq_num, sizeof(seq_num));
1758
1759                 return False;
1760         }
1761
1762         if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1763                 /* Validate that the other end sent the expected header */
1764                 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1765                 dump_data(2, verf->sig, sizeof(verf->sig));
1766                 DEBUG(2, ("should be:\n"));
1767                 dump_data(2, schannel_sig, sizeof(schannel_sig));
1768                 return False;
1769         }
1770
1771         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1772                 uchar sealing_key[16];
1773                 
1774                 /* get the key to extract the data with */
1775                 schannel_get_sealing_key(a, verf, sealing_key);
1776
1777                 /* extract the verification data */
1778                 dump_data_pw("verf->confounder:\n", verf->confounder, 
1779                              sizeof(verf->confounder));
1780                 SamOEMhash(verf->confounder, sealing_key, 8);
1781
1782                 dump_data_pw("verf->confounder_dec:\n", verf->confounder, 
1783                              sizeof(verf->confounder));
1784                 
1785                 /* extract the packet payload */
1786                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1787                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1788                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);      
1789         }
1790
1791         /* digest includes 'data' after unsealing */
1792         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1793
1794         dump_data_pw("Calculated digest:\n", digest_final, 
1795                      sizeof(digest_final));
1796         dump_data_pw("verf->packet_digest:\n", verf->packet_digest, 
1797                      sizeof(verf->packet_digest));
1798         
1799         /* compare - if the client got the same result as us, then
1800            it must know the session key */
1801         return (memcmp(digest_final, verf->packet_digest, 
1802                        sizeof(verf->packet_digest)) == 0);
1803 }
1804
1805 /*******************************************************************
1806 creates a new prs_struct containing a DATA_BLOB
1807 ********************************************************************/
1808 bool prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1809 {
1810         if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL ))
1811                 return False;
1812
1813
1814         if (!prs_copy_data_in(prs, (char *)blob->data, blob->length))
1815                 return False;
1816
1817         return True;
1818 }
1819
1820 /*******************************************************************
1821 return the contents of a prs_struct in a DATA_BLOB
1822 ********************************************************************/
1823 bool prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1824 {
1825         blob->length = prs_data_size(prs);
1826         blob->data = (uint8 *)TALLOC_ZERO_SIZE(mem_ctx, blob->length);
1827         
1828         /* set the pointer at the end of the buffer */
1829         prs_set_offset( prs, prs_data_size(prs) );
1830
1831         if (!prs_copy_all_data_out((char *)blob->data, prs))
1832                 return False;
1833         
1834         return True;
1835 }