source: branches/samba-3.2.x/source/rpc_parse/parse_prs.c@ 536

Last change on this file since 536 was 133, checked in by Paul Smedley, 18 years ago

Update trunk to 3.2.0pre3
File size: 49.8 KB
Line 
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 **/
31void 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 **/
39void 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 **/
47void 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
86void 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
100bool 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
136void 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
149void 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)
160char *prs_alloc_mem_(prs_struct *ps, size_t size, unsigned int count)
161#else
162char *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
179TALLOC_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
188void 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
199char *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
213bool 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
244bool 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
308bool 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
335char *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
344uint32 prs_data_size(prs_struct *ps)
345{
346 return ps->buffer_size;
347}
348
349/*******************************************************************
350 Fetch the current offset (external interface).
351 ********************************************************************/
352
353uint32 prs_offset(prs_struct *ps)
354{
355 return ps->data_offset;
356}
357
358/*******************************************************************
359 Set the current offset (external interface).
360 ********************************************************************/
361
362bool 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
380bool 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
398bool prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, 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->data_p + start, (size_t)len);
407 dst->data_offset += len;
408
409 return True;
410}
411
412/*******************************************************************
413 Append the data from a buffer into a parse_struct.
414 ********************************************************************/
415
416bool prs_copy_data_in(prs_struct *dst, const char *src, uint32 len)
417{
418 if (len == 0)
419 return True;
420
421 if(!prs_grow(dst, len))
422 return False;
423
424 memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
425 dst->data_offset += len;
426
427 return True;
428}
429
430/*******************************************************************
431 Copy some data from a parse_struct into a buffer.
432 ********************************************************************/
433
434bool prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
435{
436 if (len == 0)
437 return True;
438
439 if(!prs_mem_get(src, len))
440 return False;
441
442 memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
443 src->data_offset += len;
444
445 return True;
446}
447
448/*******************************************************************
449 Copy all the data from a parse_struct into a buffer.
450 ********************************************************************/
451
452bool prs_copy_all_data_out(char *dst, prs_struct *src)
453{
454 uint32 len = prs_offset(src);
455
456 if (!len)
457 return True;
458
459 prs_set_offset(src, 0);
460 return prs_copy_data_out(dst, src, len);
461}
462
463/*******************************************************************
464 Set the data as X-endian (external interface).
465 ********************************************************************/
466
467void prs_set_endian_data(prs_struct *ps, bool endian)
468{
469 ps->bigendian_data = endian;
470}
471
472/*******************************************************************
473 Align a the data_len to a multiple of align bytes - filling with
474 zeros.
475 ********************************************************************/
476
477bool prs_align(prs_struct *ps)
478{
479 uint32 mod = ps->data_offset & (ps->align-1);
480
481 if (ps->align != 0 && mod != 0) {
482 uint32 extra_space = (ps->align - mod);
483 if(!prs_grow(ps, extra_space))
484 return False;
485 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
486 ps->data_offset += extra_space;
487 }
488
489 return True;
490}
491
492/******************************************************************
493 Align on a 2 byte boundary
494 *****************************************************************/
495
496bool prs_align_uint16(prs_struct *ps)
497{
498 bool ret;
499 uint8 old_align = ps->align;
500
501 ps->align = 2;
502 ret = prs_align(ps);
503 ps->align = old_align;
504
505 return ret;
506}
507
508/******************************************************************
509 Align on a 8 byte boundary
510 *****************************************************************/
511
512bool prs_align_uint64(prs_struct *ps)
513{
514 bool ret;
515 uint8 old_align = ps->align;
516
517 ps->align = 8;
518 ret = prs_align(ps);
519 ps->align = old_align;
520
521 return ret;
522}
523
524/******************************************************************
525 Align on a specific byte boundary
526 *****************************************************************/
527
528bool prs_align_custom(prs_struct *ps, uint8 boundary)
529{
530 bool ret;
531 uint8 old_align = ps->align;
532
533 ps->align = boundary;
534 ret = prs_align(ps);
535 ps->align = old_align;
536
537 return ret;
538}
539
540
541
542/*******************************************************************
543 Align only if required (for the unistr2 string mainly)
544 ********************************************************************/
545
546bool prs_align_needed(prs_struct *ps, uint32 needed)
547{
548 if (needed==0)
549 return True;
550 else
551 return prs_align(ps);
552}
553
554/*******************************************************************
555 Ensure we can read/write to a given offset.
556 ********************************************************************/
557
558char *prs_mem_get(prs_struct *ps, uint32 extra_size)
559{
560 if(UNMARSHALLING(ps)) {
561 /*
562 * If reading, ensure that we can read the requested size item.
563 */
564 if (ps->data_offset + extra_size > ps->buffer_size) {
565 DEBUG(0,("prs_mem_get: reading data of size %u would overrun "
566 "buffer by %u bytes.\n",
567 (unsigned int)extra_size,
568 (unsigned int)(ps->data_offset + extra_size - ps->buffer_size) ));
569 return NULL;
570 }
571 } else {
572 /*
573 * Writing - grow the buffer if needed.
574 */
575 if(!prs_grow(ps, extra_size))
576 return NULL;
577 }
578 return &ps->data_p[ps->data_offset];
579}
580
581/*******************************************************************
582 Change the struct type.
583 ********************************************************************/
584
585void prs_switch_type(prs_struct *ps, bool io)
586{
587 if ((ps->io ^ io) == True)
588 ps->io=io;
589}
590
591/*******************************************************************
592 Force a prs_struct to be dynamic even when it's size is 0.
593 ********************************************************************/
594
595void prs_force_dynamic(prs_struct *ps)
596{
597 ps->is_dynamic=True;
598}
599
600/*******************************************************************
601 Associate a session key with a parse struct.
602 ********************************************************************/
603
604void prs_set_session_key(prs_struct *ps, const char sess_key[16])
605{
606 ps->sess_key = sess_key;
607}
608
609/*******************************************************************
610 Stream a uint8.
611 ********************************************************************/
612
613bool prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
614{
615 char *q = prs_mem_get(ps, 1);
616 if (q == NULL)
617 return False;
618
619 if (UNMARSHALLING(ps))
620 *data8 = CVAL(q,0);
621 else
622 SCVAL(q,0,*data8);
623
624 DEBUG(5,("%s%04x %s: %02x\n", tab_depth(5,depth), ps->data_offset, name, *data8));
625
626 ps->data_offset += 1;
627
628 return True;
629}
630
631/*******************************************************************
632 Stream a uint16* (allocate memory if unmarshalling)
633 ********************************************************************/
634
635bool prs_pointer( const char *name, prs_struct *ps, int depth,
636 void *dta, size_t data_size,
637 bool (*prs_fn)(const char*, prs_struct*, int, void*) )
638{
639 void ** data = (void **)dta;
640 uint32 data_p;
641
642 /* output f000baaa to stream if the pointer is non-zero. */
643
644 data_p = *data ? 0xf000baaa : 0;
645
646 if ( !prs_uint32("ptr", ps, depth, &data_p ))
647 return False;
648
649 /* we're done if there is no data */
650
651 if ( !data_p )
652 return True;
653
654 if (UNMARSHALLING(ps)) {
655 if (data_size) {
656 if ( !(*data = PRS_ALLOC_MEM(ps, char, data_size)) )
657 return False;
658 } else {
659 *data = NULL;
660 }
661 }
662
663 return prs_fn(name, ps, depth, *data);
664}
665
666
667/*******************************************************************
668 Stream a uint16.
669 ********************************************************************/
670
671bool prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
672{
673 char *q = prs_mem_get(ps, sizeof(uint16));
674 if (q == NULL)
675 return False;
676
677 if (UNMARSHALLING(ps)) {
678 if (ps->bigendian_data)
679 *data16 = RSVAL(q,0);
680 else
681 *data16 = SVAL(q,0);
682 } else {
683 if (ps->bigendian_data)
684 RSSVAL(q,0,*data16);
685 else
686 SSVAL(q,0,*data16);
687 }
688
689 DEBUG(5,("%s%04x %s: %04x\n", tab_depth(5,depth), ps->data_offset, name, *data16));
690
691 ps->data_offset += sizeof(uint16);
692
693 return True;
694}
695
696/*******************************************************************
697 Stream a uint32.
698 ********************************************************************/
699
700bool prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
701{
702 char *q = prs_mem_get(ps, sizeof(uint32));
703 if (q == NULL)
704 return False;
705
706 if (UNMARSHALLING(ps)) {
707 if (ps->bigendian_data)
708 *data32 = RIVAL(q,0);
709 else
710 *data32 = IVAL(q,0);
711 } else {
712 if (ps->bigendian_data)
713 RSIVAL(q,0,*data32);
714 else
715 SIVAL(q,0,*data32);
716 }
717
718 DEBUG(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
719
720 ps->data_offset += sizeof(uint32);
721
722 return True;
723}
724
725/*******************************************************************
726 Stream an int32.
727 ********************************************************************/
728
729bool prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
730{
731 char *q = prs_mem_get(ps, sizeof(int32));
732 if (q == NULL)
733 return False;
734
735 if (UNMARSHALLING(ps)) {
736 if (ps->bigendian_data)
737 *data32 = RIVALS(q,0);
738 else
739 *data32 = IVALS(q,0);
740 } else {
741 if (ps->bigendian_data)
742 RSIVALS(q,0,*data32);
743 else
744 SIVALS(q,0,*data32);
745 }
746
747 DEBUG(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
748
749 ps->data_offset += sizeof(int32);
750
751 return True;
752}
753
754/*******************************************************************
755 Stream a NTSTATUS
756 ********************************************************************/
757
758bool prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
759{
760 char *q = prs_mem_get(ps, sizeof(uint32));
761 if (q == NULL)
762 return False;
763
764 if (UNMARSHALLING(ps)) {
765 if (ps->bigendian_data)
766 *status = NT_STATUS(RIVAL(q,0));
767 else
768 *status = NT_STATUS(IVAL(q,0));
769 } else {
770 if (ps->bigendian_data)
771 RSIVAL(q,0,NT_STATUS_V(*status));
772 else
773 SIVAL(q,0,NT_STATUS_V(*status));
774 }
775
776 DEBUG(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
777 nt_errstr(*status)));
778
779 ps->data_offset += sizeof(uint32);
780
781 return True;
782}
783
784/*******************************************************************
785 Stream a DCE error code
786 ********************************************************************/
787
788bool prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
789{
790 char *q = prs_mem_get(ps, sizeof(uint32));
791 if (q == NULL)
792 return False;
793
794 if (UNMARSHALLING(ps)) {
795 if (ps->bigendian_data)
796 *status = NT_STATUS(RIVAL(q,0));
797 else
798 *status = NT_STATUS(IVAL(q,0));
799 } else {
800 if (ps->bigendian_data)
801 RSIVAL(q,0,NT_STATUS_V(*status));
802 else
803 SIVAL(q,0,NT_STATUS_V(*status));
804 }
805
806 DEBUG(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
807 dcerpc_errstr(NT_STATUS_V(*status))));
808
809 ps->data_offset += sizeof(uint32);
810
811 return True;
812}
813
814
815/*******************************************************************
816 Stream a WERROR
817 ********************************************************************/
818
819bool prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
820{
821 char *q = prs_mem_get(ps, sizeof(uint32));
822 if (q == NULL)
823 return False;
824
825 if (UNMARSHALLING(ps)) {
826 if (ps->bigendian_data)
827 *status = W_ERROR(RIVAL(q,0));
828 else
829 *status = W_ERROR(IVAL(q,0));
830 } else {
831 if (ps->bigendian_data)
832 RSIVAL(q,0,W_ERROR_V(*status));
833 else
834 SIVAL(q,0,W_ERROR_V(*status));
835 }
836
837 DEBUG(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
838 dos_errstr(*status)));
839
840 ps->data_offset += sizeof(uint32);
841
842 return True;
843}
844
845
846/******************************************************************
847 Stream an array of uint8s. Length is number of uint8s.
848 ********************************************************************/
849
850bool prs_uint8s(bool charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
851{
852 int i;
853 char *q = prs_mem_get(ps, len);
854 if (q == NULL)
855 return False;
856
857 if (UNMARSHALLING(ps)) {
858 for (i = 0; i < len; i++)
859 data8s[i] = CVAL(q,i);
860 } else {
861 for (i = 0; i < len; i++)
862 SCVAL(q, i, data8s[i]);
863 }
864
865 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset ,name));
866 if (charmode)
867 print_asc(5, (unsigned char*)data8s, len);
868 else {
869 for (i = 0; i < len; i++)
870 DEBUG(5,("%02x ", data8s[i]));
871 }
872 DEBUG(5,("\n"));
873
874 ps->data_offset += len;
875
876 return True;
877}
878
879/******************************************************************
880 Stream an array of uint16s. Length is number of uint16s.
881 ********************************************************************/
882
883bool prs_uint16s(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
884{
885 int i;
886 char *q = prs_mem_get(ps, len * sizeof(uint16));
887 if (q == NULL)
888 return False;
889
890 if (UNMARSHALLING(ps)) {
891 if (ps->bigendian_data) {
892 for (i = 0; i < len; i++)
893 data16s[i] = RSVAL(q, 2*i);
894 } else {
895 for (i = 0; i < len; i++)
896 data16s[i] = SVAL(q, 2*i);
897 }
898 } else {
899 if (ps->bigendian_data) {
900 for (i = 0; i < len; i++)
901 RSSVAL(q, 2*i, data16s[i]);
902 } else {
903 for (i = 0; i < len; i++)
904 SSVAL(q, 2*i, data16s[i]);
905 }
906 }
907
908 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
909 if (charmode)
910 print_asc(5, (unsigned char*)data16s, 2*len);
911 else {
912 for (i = 0; i < len; i++)
913 DEBUG(5,("%04x ", data16s[i]));
914 }
915 DEBUG(5,("\n"));
916
917 ps->data_offset += (len * sizeof(uint16));
918
919 return True;
920}
921
922/******************************************************************
923 Start using a function for streaming unicode chars. If unmarshalling,
924 output must be little-endian, if marshalling, input must be little-endian.
925 ********************************************************************/
926
927static void dbg_rw_punival(bool charmode, const char *name, int depth, prs_struct *ps,
928 char *in_buf, char *out_buf, int len)
929{
930 int i;
931
932 if (UNMARSHALLING(ps)) {
933 if (ps->bigendian_data) {
934 for (i = 0; i < len; i++)
935 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
936 } else {
937 for (i = 0; i < len; i++)
938 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
939 }
940 } else {
941 if (ps->bigendian_data) {
942 for (i = 0; i < len; i++)
943 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
944 } else {
945 for (i = 0; i < len; i++)
946 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
947 }
948 }
949
950 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
951 if (charmode)
952 print_asc(5, (unsigned char*)out_buf, 2*len);
953 else {
954 for (i = 0; i < len; i++)
955 DEBUG(5,("%04x ", out_buf[i]));
956 }
957 DEBUG(5,("\n"));
958}
959
960/******************************************************************
961 Stream a unistr. Always little endian.
962 ********************************************************************/
963
964bool prs_uint16uni(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
965{
966 char *q = prs_mem_get(ps, len * sizeof(uint16));
967 if (q == NULL)
968 return False;
969
970 dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
971 ps->data_offset += (len * sizeof(uint16));
972
973 return True;
974}
975
976/******************************************************************
977 Stream an array of uint32s. Length is number of uint32s.
978 ********************************************************************/
979
980bool prs_uint32s(bool charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
981{
982 int i;
983 char *q = prs_mem_get(ps, len * sizeof(uint32));
984 if (q == NULL)
985 return False;
986
987 if (UNMARSHALLING(ps)) {
988 if (ps->bigendian_data) {
989 for (i = 0; i < len; i++)
990 data32s[i] = RIVAL(q, 4*i);
991 } else {
992 for (i = 0; i < len; i++)
993 data32s[i] = IVAL(q, 4*i);
994 }
995 } else {
996 if (ps->bigendian_data) {
997 for (i = 0; i < len; i++)
998 RSIVAL(q, 4*i, data32s[i]);
999 } else {
1000 for (i = 0; i < len; i++)
1001 SIVAL(q, 4*i, data32s[i]);
1002 }
1003 }
1004
1005 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1006 if (charmode)
1007 print_asc(5, (unsigned char*)data32s, 4*len);
1008 else {
1009 for (i = 0; i < len; i++)
1010 DEBUG(5,("%08x ", data32s[i]));
1011 }
1012 DEBUG(5,("\n"));
1013
1014 ps->data_offset += (len * sizeof(uint32));
1015
1016 return True;
1017}
1018
1019/******************************************************************
1020 Stream an array of unicode string, length/buffer specified separately,
1021 in uint16 chars. The unicode string is already in little-endian format.
1022 ********************************************************************/
1023
1024bool prs_buffer5(bool charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
1025{
1026 char *p;
1027 char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
1028 if (q == NULL)
1029 return False;
1030
1031 /* If the string is empty, we don't have anything to stream */
1032 if (str->buf_len==0)
1033 return True;
1034
1035 if (UNMARSHALLING(ps)) {
1036 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
1037 if (str->buffer == NULL)
1038 return False;
1039 }
1040
1041 p = (char *)str->buffer;
1042
1043 dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
1044
1045 ps->data_offset += (str->buf_len * sizeof(uint16));
1046
1047 return True;
1048}
1049
1050/******************************************************************
1051 Stream a "not" unicode string, length/buffer specified separately,
1052 in byte chars. String is in little-endian format.
1053 ********************************************************************/
1054
1055bool prs_regval_buffer(bool charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
1056{
1057 char *p;
1058 char *q = prs_mem_get(ps, buf->buf_len);
1059 if (q == NULL)
1060 return False;
1061
1062 if (UNMARSHALLING(ps)) {
1063 if (buf->buf_len > buf->buf_max_len) {
1064 return False;
1065 }
1066 if ( buf->buf_max_len ) {
1067 buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
1068 if ( buf->buffer == NULL )
1069 return False;
1070 } else {
1071 buf->buffer = NULL;
1072 }
1073 }
1074
1075 p = (char *)buf->buffer;
1076
1077 dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
1078 ps->data_offset += buf->buf_len;
1079
1080 return True;
1081}
1082
1083/******************************************************************
1084 Stream a string, length/buffer specified separately,
1085 in uint8 chars.
1086 ********************************************************************/
1087
1088bool prs_string2(bool charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
1089{
1090 unsigned int i;
1091 char *q = prs_mem_get(ps, str->str_str_len);
1092 if (q == NULL)
1093 return False;
1094
1095 if (UNMARSHALLING(ps)) {
1096 if (str->str_str_len > str->str_max_len) {
1097 return False;
1098 }
1099 if (str->str_max_len) {
1100 str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
1101 if (str->buffer == NULL)
1102 return False;
1103 } else {
1104 str->buffer = NULL;
1105 /* Return early to ensure Coverity isn't confused. */
1106 DEBUG(5,("%s%04x %s: \n", tab_depth(5,depth), ps->data_offset, name));
1107 return True;
1108 }
1109 }
1110
1111 if (UNMARSHALLING(ps)) {
1112 for (i = 0; i < str->str_str_len; i++)
1113 str->buffer[i] = CVAL(q,i);
1114 } else {
1115 for (i = 0; i < str->str_str_len; i++)
1116 SCVAL(q, i, str->buffer[i]);
1117 }
1118
1119 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1120 if (charmode)
1121 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
1122 else {
1123 for (i = 0; i < str->str_str_len; i++)
1124 DEBUG(5,("%02x ", str->buffer[i]));
1125 }
1126 DEBUG(5,("\n"));
1127
1128 ps->data_offset += str->str_str_len;
1129
1130 return True;
1131}
1132
1133/******************************************************************
1134 Stream a unicode string, length/buffer specified separately,
1135 in uint16 chars. The unicode string is already in little-endian format.
1136 ********************************************************************/
1137
1138bool prs_unistr2(bool charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1139{
1140 char *p;
1141 char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1142 if (q == NULL)
1143 return False;
1144
1145 /* If the string is empty, we don't have anything to stream */
1146 if (str->uni_str_len==0)
1147 return True;
1148
1149 if (UNMARSHALLING(ps)) {
1150 if (str->uni_str_len > str->uni_max_len) {
1151 return False;
1152 }
1153 if (str->uni_max_len) {
1154 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1155 if (str->buffer == NULL)
1156 return False;
1157 } else {
1158 str->buffer = NULL;
1159 }
1160 }
1161
1162 p = (char *)str->buffer;
1163
1164 dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1165
1166 ps->data_offset += (str->uni_str_len * sizeof(uint16));
1167
1168 return True;
1169}
1170
1171/******************************************************************
1172 Stream a unicode string, length/buffer specified separately,
1173 in uint16 chars. The unicode string is already in little-endian format.
1174 ********************************************************************/
1175
1176bool prs_unistr3(bool charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1177{
1178 char *p;
1179 char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1180 if (q == NULL)
1181 return False;
1182
1183 if (UNMARSHALLING(ps)) {
1184 if (str->uni_str_len) {
1185 str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1186 if (str->str.buffer == NULL)
1187 return False;
1188 } else {
1189 str->str.buffer = NULL;
1190 }
1191 }
1192
1193 p = (char *)str->str.buffer;
1194
1195 dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1196 ps->data_offset += (str->uni_str_len * sizeof(uint16));
1197
1198 return True;
1199}
1200
1201/*******************************************************************
1202 Stream a unicode null-terminated string. As the string is already
1203 in little-endian format then do it as a stream of bytes.
1204 ********************************************************************/
1205
1206bool prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1207{
1208 unsigned int len = 0;
1209 unsigned char *p = (unsigned char *)str->buffer;
1210 uint8 *start;
1211 char *q;
1212 uint32 max_len;
1213 uint16* ptr;
1214
1215 if (MARSHALLING(ps)) {
1216
1217 for(len = 0; str->buffer[len] != 0; len++)
1218 ;
1219
1220 q = prs_mem_get(ps, (len+1)*2);
1221 if (q == NULL)
1222 return False;
1223
1224 start = (uint8*)q;
1225
1226 for(len = 0; str->buffer[len] != 0; len++) {
1227 if(ps->bigendian_data) {
1228 /* swap bytes - p is little endian, q is big endian. */
1229 q[0] = (char)p[1];
1230 q[1] = (char)p[0];
1231 p += 2;
1232 q += 2;
1233 }
1234 else
1235 {
1236 q[0] = (char)p[0];
1237 q[1] = (char)p[1];
1238 p += 2;
1239 q += 2;
1240 }
1241 }
1242
1243 /*
1244 * even if the string is 'empty' (only an \0 char)
1245 * at this point the leading \0 hasn't been parsed.
1246 * so parse it now
1247 */
1248
1249 q[0] = 0;
1250 q[1] = 0;
1251 q += 2;
1252
1253 len++;
1254
1255 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1256 print_asc(5, (unsigned char*)start, 2*len);
1257 DEBUG(5, ("\n"));
1258 }
1259 else { /* unmarshalling */
1260
1261 uint32 alloc_len = 0;
1262 q = ps->data_p + prs_offset(ps);
1263
1264 /*
1265 * Work out how much space we need and talloc it.
1266 */
1267 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1268
1269 /* the test of the value of *ptr helps to catch the circumstance
1270 where we have an emtpty (non-existent) string in the buffer */
1271 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1272 /* do nothing */
1273 ;
1274
1275 if (alloc_len < max_len)
1276 alloc_len += 1;
1277
1278 /* should we allocate anything at all? */
1279 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1280 if ((str->buffer == NULL) && (alloc_len > 0))
1281 return False;
1282
1283 p = (unsigned char *)str->buffer;
1284
1285 len = 0;
1286 /* the (len < alloc_len) test is to prevent us from overwriting
1287 memory that is not ours...if we get that far, we have a non-null
1288 terminated string in the buffer and have messed up somewhere */
1289 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1290 if(ps->bigendian_data)
1291 {
1292 /* swap bytes - q is big endian, p is little endian. */
1293 p[0] = (unsigned char)q[1];
1294 p[1] = (unsigned char)q[0];
1295 p += 2;
1296 q += 2;
1297 } else {
1298
1299 p[0] = (unsigned char)q[0];
1300 p[1] = (unsigned char)q[1];
1301 p += 2;
1302 q += 2;
1303 }
1304
1305 len++;
1306 }
1307 if (len < alloc_len) {
1308 /* NULL terminate the UNISTR */
1309 str->buffer[len++] = '\0';
1310 }
1311
1312 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1313 print_asc(5, (unsigned char*)str->buffer, 2*len);
1314 DEBUG(5, ("\n"));
1315 }
1316
1317 /* set the offset in the prs_struct; 'len' points to the
1318 terminiating NULL in the UNISTR so we need to go one more
1319 uint16 */
1320 ps->data_offset += (len)*2;
1321
1322 return True;
1323}
1324
1325
1326/*******************************************************************
1327 Stream a null-terminated string. len is strlen, and therefore does
1328 not include the null-termination character.
1329 ********************************************************************/
1330
1331bool prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1332{
1333 char *q;
1334 int i;
1335 int len;
1336
1337 if (UNMARSHALLING(ps))
1338 len = strlen(&ps->data_p[ps->data_offset]);
1339 else
1340 len = strlen(str);
1341
1342 len = MIN(len, (max_buf_size-1));
1343
1344 q = prs_mem_get(ps, len+1);
1345 if (q == NULL)
1346 return False;
1347
1348 for(i = 0; i < len; i++) {
1349 if (UNMARSHALLING(ps))
1350 str[i] = q[i];
1351 else
1352 q[i] = str[i];
1353 }
1354
1355 /* The terminating null. */
1356 str[i] = '\0';
1357
1358 if (MARSHALLING(ps)) {
1359 q[i] = '\0';
1360 }
1361
1362 ps->data_offset += len+1;
1363
1364 dump_data(5+depth, (uint8 *)q, len);
1365
1366 return True;
1367}
1368
1369bool prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str)
1370{
1371 size_t len;
1372 char *tmp_str;
1373
1374 if (UNMARSHALLING(ps)) {
1375 len = strlen(&ps->data_p[ps->data_offset]);
1376 } else {
1377 len = strlen(*str);
1378 }
1379
1380 tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1381
1382 if (tmp_str == NULL) {
1383 return False;
1384 }
1385
1386 if (MARSHALLING(ps)) {
1387 strncpy(tmp_str, *str, len);
1388 }
1389
1390 if (!prs_string(name, ps, depth, tmp_str, len+1)) {
1391 return False;
1392 }
1393
1394 *str = tmp_str;
1395 return True;
1396}
1397
1398/*******************************************************************
1399 prs_uint16 wrapper. Call this and it sets up a pointer to where the
1400 uint16 should be stored, or gets the size if reading.
1401 ********************************************************************/
1402
1403bool prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1404{
1405 *offset = ps->data_offset;
1406 if (UNMARSHALLING(ps)) {
1407 /* reading. */
1408 return prs_uint16(name, ps, depth, data16);
1409 } else {
1410 char *q = prs_mem_get(ps, sizeof(uint16));
1411 if(q ==NULL)
1412 return False;
1413 ps->data_offset += sizeof(uint16);
1414 }
1415 return True;
1416}
1417
1418/*******************************************************************
1419 prs_uint16 wrapper. call this and it retrospectively stores the size.
1420 does nothing on reading, as that is already handled by ...._pre()
1421 ********************************************************************/
1422
1423bool prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1424 uint32 ptr_uint16, uint32 start_offset)
1425{
1426 if (MARSHALLING(ps)) {
1427 /*
1428 * Writing - temporarily move the offset pointer.
1429 */
1430 uint16 data_size = ps->data_offset - start_offset;
1431 uint32 old_offset = ps->data_offset;
1432
1433 ps->data_offset = ptr_uint16;
1434 if(!prs_uint16(name, ps, depth, &data_size)) {
1435 ps->data_offset = old_offset;
1436 return False;
1437 }
1438 ps->data_offset = old_offset;
1439 } else {
1440 ps->data_offset = start_offset + (uint32)(*data16);
1441 }
1442 return True;
1443}
1444
1445/*******************************************************************
1446 prs_uint32 wrapper. Call this and it sets up a pointer to where the
1447 uint32 should be stored, or gets the size if reading.
1448 ********************************************************************/
1449
1450bool prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1451{
1452 *offset = ps->data_offset;
1453 if (UNMARSHALLING(ps) && (data32 != NULL)) {
1454 /* reading. */
1455 return prs_uint32(name, ps, depth, data32);
1456 } else {
1457 ps->data_offset += sizeof(uint32);
1458 }
1459 return True;
1460}
1461
1462/*******************************************************************
1463 prs_uint32 wrapper. call this and it retrospectively stores the size.
1464 does nothing on reading, as that is already handled by ...._pre()
1465 ********************************************************************/
1466
1467bool prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1468 uint32 ptr_uint32, uint32 data_size)
1469{
1470 if (MARSHALLING(ps)) {
1471 /*
1472 * Writing - temporarily move the offset pointer.
1473 */
1474 uint32 old_offset = ps->data_offset;
1475 ps->data_offset = ptr_uint32;
1476 if(!prs_uint32(name, ps, depth, &data_size)) {
1477 ps->data_offset = old_offset;
1478 return False;
1479 }
1480 ps->data_offset = old_offset;
1481 }
1482 return True;
1483}
1484
1485/* useful function to store a structure in rpc wire format */
1486int tdb_prs_store(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps)
1487{
1488 TDB_DATA dbuf;
1489 dbuf.dptr = (uint8 *)ps->data_p;
1490 dbuf.dsize = prs_offset(ps);
1491 return tdb_trans_store(tdb, kbuf, dbuf, TDB_REPLACE);
1492}
1493
1494/* useful function to fetch a structure into rpc wire format */
1495int tdb_prs_fetch(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps, TALLOC_CTX *mem_ctx)
1496{
1497 TDB_DATA dbuf;
1498
1499 prs_init_empty(ps, mem_ctx, UNMARSHALL);
1500
1501 dbuf = tdb_fetch(tdb, kbuf);
1502 if (!dbuf.dptr)
1503 return -1;
1504
1505 prs_give_memory(ps, (char *)dbuf.dptr, dbuf.dsize, True);
1506
1507 return 0;
1508}
1509
1510/*******************************************************************
1511 hash a stream.
1512 ********************************************************************/
1513
1514bool prs_hash1(prs_struct *ps, uint32 offset, int len)
1515{
1516 char *q;
1517
1518 q = ps->data_p;
1519 q = &q[offset];
1520
1521#ifdef DEBUG_PASSWORD
1522 DEBUG(100, ("prs_hash1\n"));
1523 dump_data(100, (uint8 *)ps->sess_key, 16);
1524 dump_data(100, (uint8 *)q, len);
1525#endif
1526 SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len);
1527
1528#ifdef DEBUG_PASSWORD
1529 dump_data(100, (uint8 *)q, len);
1530#endif
1531
1532 return True;
1533}
1534
1535/*******************************************************************
1536 Create a digest over the entire packet (including the data), and
1537 MD5 it with the session key.
1538 ********************************************************************/
1539
1540static void schannel_digest(struct schannel_auth_struct *a,
1541 enum pipe_auth_level auth_level,
1542 RPC_AUTH_SCHANNEL_CHK * verf,
1543 char *data, size_t data_len,
1544 uchar digest_final[16])
1545{
1546 uchar whole_packet_digest[16];
1547 uchar zeros[4];
1548 struct MD5Context ctx3;
1549
1550 ZERO_STRUCT(zeros);
1551
1552 /* verfiy the signature on the packet by MD5 over various bits */
1553 MD5Init(&ctx3);
1554 /* use our sequence number, which ensures the packet is not
1555 out of order */
1556 MD5Update(&ctx3, zeros, sizeof(zeros));
1557 MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1558 if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1559 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1560 }
1561 MD5Update(&ctx3, (const unsigned char *)data, data_len);
1562 MD5Final(whole_packet_digest, &ctx3);
1563 dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1564
1565 /* MD5 this result and the session key, to prove that
1566 only a valid client could had produced this */
1567 hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1568}
1569
1570/*******************************************************************
1571 Calculate the key with which to encode the data payload
1572 ********************************************************************/
1573
1574static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1575 RPC_AUTH_SCHANNEL_CHK *verf,
1576 uchar sealing_key[16])
1577{
1578 uchar zeros[4];
1579 uchar digest2[16];
1580 uchar sess_kf0[16];
1581 int i;
1582
1583 ZERO_STRUCT(zeros);
1584
1585 for (i = 0; i < sizeof(sess_kf0); i++) {
1586 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1587 }
1588
1589 dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1590
1591 /* MD5 of sess_kf0 and 4 zero bytes */
1592 hmac_md5(sess_kf0, zeros, 0x4, digest2);
1593 dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1594
1595 /* MD5 of the above result, plus 8 bytes of sequence number */
1596 hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1597 dump_data_pw("sealing_key:\n", sealing_key, 16);
1598}
1599
1600/*******************************************************************
1601 Encode or Decode the sequence number (which is symmetric)
1602 ********************************************************************/
1603
1604static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1605 RPC_AUTH_SCHANNEL_CHK *verf)
1606{
1607 uchar zeros[4];
1608 uchar sequence_key[16];
1609 uchar digest1[16];
1610
1611 ZERO_STRUCT(zeros);
1612
1613 hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1614 dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1615
1616 hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1617
1618 dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1619
1620 dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1621 SamOEMhash(verf->seq_num, sequence_key, 8);
1622 dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1623}
1624
1625/*******************************************************************
1626creates an RPC_AUTH_SCHANNEL_CHK structure.
1627********************************************************************/
1628
1629static bool init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1630 const uchar sig[8],
1631 const uchar packet_digest[8],
1632 const uchar seq_num[8], const uchar confounder[8])
1633{
1634 if (chk == NULL)
1635 return False;
1636
1637 memcpy(chk->sig, sig, sizeof(chk->sig));
1638 memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1639 memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1640 memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1641
1642 return True;
1643}
1644
1645/*******************************************************************
1646 Encode a blob of data using the schannel alogrithm, also produceing
1647 a checksum over the original data. We currently only support
1648 signing and sealing togeather - the signing-only code is close, but not
1649 quite compatible with what MS does.
1650 ********************************************************************/
1651
1652void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1653 enum schannel_direction direction,
1654 RPC_AUTH_SCHANNEL_CHK * verf,
1655 char *data, size_t data_len)
1656{
1657 uchar digest_final[16];
1658 uchar confounder[8];
1659 uchar seq_num[8];
1660 static const uchar nullbytes[8] = { 0, };
1661
1662 static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1663 static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1664 const uchar *schannel_sig = NULL;
1665
1666 DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1667
1668 if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1669 schannel_sig = schannel_seal_sig;
1670 } else {
1671 schannel_sig = schannel_sign_sig;
1672 }
1673
1674 /* fill the 'confounder' with random data */
1675 generate_random_buffer(confounder, sizeof(confounder));
1676
1677 dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1678
1679 RSIVAL(seq_num, 0, a->seq_num);
1680
1681 switch (direction) {
1682 case SENDER_IS_INITIATOR:
1683 SIVAL(seq_num, 4, 0x80);
1684 break;
1685 case SENDER_IS_ACCEPTOR:
1686 SIVAL(seq_num, 4, 0x0);
1687 break;
1688 }
1689
1690 dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1691
1692 init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1693 seq_num, confounder);
1694
1695 /* produce a digest of the packet to prove it's legit (before we seal it) */
1696 schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1697 memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1698
1699 if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1700 uchar sealing_key[16];
1701
1702 /* get the key to encode the data with */
1703 schannel_get_sealing_key(a, verf, sealing_key);
1704
1705 /* encode the verification data */
1706 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1707 SamOEMhash(verf->confounder, sealing_key, 8);
1708
1709 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1710
1711 /* encode the packet payload */
1712 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1713 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1714 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1715 }
1716
1717 /* encode the sequence number (key based on packet digest) */
1718 /* needs to be done after the sealing, as the original version
1719 is used in the sealing stuff... */
1720 schannel_deal_with_seq_num(a, verf);
1721
1722 return;
1723}
1724
1725/*******************************************************************
1726 Decode a blob of data using the schannel alogrithm, also verifiying
1727 a checksum over the original data. We currently can verify signed messages,
1728 as well as decode sealed messages
1729 ********************************************************************/
1730
1731bool schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1732 enum schannel_direction direction,
1733 RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1734{
1735 uchar digest_final[16];
1736
1737 static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1738 static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1739 const uchar *schannel_sig = NULL;
1740
1741 uchar seq_num[8];
1742
1743 DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1744
1745 if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1746 schannel_sig = schannel_seal_sig;
1747 } else {
1748 schannel_sig = schannel_sign_sig;
1749 }
1750
1751 /* Create the expected sequence number for comparison */
1752 RSIVAL(seq_num, 0, a->seq_num);
1753
1754 switch (direction) {
1755 case SENDER_IS_INITIATOR:
1756 SIVAL(seq_num, 4, 0x80);
1757 break;
1758 case SENDER_IS_ACCEPTOR:
1759 SIVAL(seq_num, 4, 0x0);
1760 break;
1761 }
1762
1763 DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1764 dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1765
1766 dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1767
1768 /* extract the sequence number (key based on supplied packet digest) */
1769 /* needs to be done before the sealing, as the original version
1770 is used in the sealing stuff... */
1771 schannel_deal_with_seq_num(a, verf);
1772
1773 if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1774 /* don't even bother with the below if the sequence number is out */
1775 /* The sequence number is MD5'ed with a key based on the whole-packet
1776 digest, as supplied by the client. We check that it's a valid
1777 checksum after the decode, below
1778 */
1779 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1780 dump_data(2, verf->seq_num, sizeof(verf->seq_num));
1781 DEBUG(2, ("should be:\n"));
1782 dump_data(2, seq_num, sizeof(seq_num));
1783
1784 return False;
1785 }
1786
1787 if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1788 /* Validate that the other end sent the expected header */
1789 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1790 dump_data(2, verf->sig, sizeof(verf->sig));
1791 DEBUG(2, ("should be:\n"));
1792 dump_data(2, schannel_sig, sizeof(schannel_sig));
1793 return False;
1794 }
1795
1796 if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1797 uchar sealing_key[16];
1798
1799 /* get the key to extract the data with */
1800 schannel_get_sealing_key(a, verf, sealing_key);
1801
1802 /* extract the verification data */
1803 dump_data_pw("verf->confounder:\n", verf->confounder,
1804 sizeof(verf->confounder));
1805 SamOEMhash(verf->confounder, sealing_key, 8);
1806
1807 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1808 sizeof(verf->confounder));
1809
1810 /* extract the packet payload */
1811 dump_data_pw("data :\n", (const unsigned char *)data, data_len);
1812 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1813 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1814 }
1815
1816 /* digest includes 'data' after unsealing */
1817 schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1818
1819 dump_data_pw("Calculated digest:\n", digest_final,
1820 sizeof(digest_final));
1821 dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1822 sizeof(verf->packet_digest));
1823
1824 /* compare - if the client got the same result as us, then
1825 it must know the session key */
1826 return (memcmp(digest_final, verf->packet_digest,
1827 sizeof(verf->packet_digest)) == 0);
1828}
1829
1830/*******************************************************************
1831creates a new prs_struct containing a DATA_BLOB
1832********************************************************************/
1833bool prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1834{
1835 if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL ))
1836 return False;
1837
1838
1839 if (!prs_copy_data_in(prs, (char *)blob->data, blob->length))
1840 return False;
1841
1842 return True;
1843}
1844
1845/*******************************************************************
1846return the contents of a prs_struct in a DATA_BLOB
1847********************************************************************/
1848bool prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1849{
1850 blob->length = prs_data_size(prs);
1851 blob->data = (uint8 *)TALLOC_ZERO_SIZE(mem_ctx, blob->length);
1852
1853 /* set the pointer at the end of the buffer */
1854 prs_set_offset( prs, prs_data_size(prs) );
1855
1856 if (!prs_copy_all_data_out((char *)blob->data, prs))
1857 return False;
1858
1859 return True;
1860}
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