1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
|
/*
Unix SMB/CIFS implementation.
libndr compression support
Copyright (C) Stefan Metzmacher 2005
Copyright (C) Matthieu Suiche 2008
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/compression/lzxpress.h"
#include "librpc/ndr/libndr.h"
#include "librpc/ndr/ndr_compression.h"
#include <zlib.h>
static voidpf ndr_zlib_alloc(voidpf opaque, uInt items, uInt size)
{
return talloc_zero_size(opaque, items * size);
}
static void ndr_zlib_free(voidpf opaque, voidpf address)
{
talloc_free(address);
}
static enum ndr_err_code ndr_pull_compression_mszip_chunk(struct ndr_pull *ndrpull,
struct ndr_push *ndrpush,
z_stream *z,
bool *last)
{
DATA_BLOB comp_chunk;
uint32_t comp_chunk_offset;
uint32_t comp_chunk_size;
DATA_BLOB plain_chunk;
uint32_t plain_chunk_offset;
uint32_t plain_chunk_size;
int z_ret;
NDR_CHECK(ndr_pull_uint32(ndrpull, NDR_SCALARS, &plain_chunk_size));
if (plain_chunk_size > 0x00008000) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION, "Bad MSZIP plain chunk size %08X > 0x00008000 (PULL)",
plain_chunk_size);
}
NDR_CHECK(ndr_pull_uint32(ndrpull, NDR_SCALARS, &comp_chunk_size));
DEBUG(10,("MSZIP plain_chunk_size: %08X (%u) comp_chunk_size: %08X (%u)\n",
plain_chunk_size, plain_chunk_size, comp_chunk_size, comp_chunk_size));
comp_chunk_offset = ndrpull->offset;
NDR_CHECK(ndr_pull_advance(ndrpull, comp_chunk_size));
comp_chunk.length = comp_chunk_size;
comp_chunk.data = ndrpull->data + comp_chunk_offset;
plain_chunk_offset = ndrpush->offset;
NDR_CHECK(ndr_push_zero(ndrpush, plain_chunk_size));
plain_chunk.length = plain_chunk_size;
plain_chunk.data = ndrpush->data + plain_chunk_offset;
if (comp_chunk.length < 2) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
"Bad MSZIP comp chunk size %u < 2 (PULL)",
(unsigned int)comp_chunk.length);
}
/* CK = Chris Kirmse, official Microsoft purloiner */
if (comp_chunk.data[0] != 'C' ||
comp_chunk.data[1] != 'K') {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
"Bad MSZIP invalid prefix [%c%c] != [CK]",
comp_chunk.data[0], comp_chunk.data[1]);
}
z->next_in = comp_chunk.data + 2;
z->avail_in = comp_chunk.length -2;
z->total_in = 0;
z->next_out = plain_chunk.data;
z->avail_out = plain_chunk.length;
z->total_out = 0;
if (!z->opaque) {
/* the first time we need to intialize completely */
z->zalloc = ndr_zlib_alloc;
z->zfree = ndr_zlib_free;
z->opaque = ndrpull;
z_ret = inflateInit2(z, -15);
if (z_ret != Z_OK) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
"Bad inflateInit2 error %s(%d) (PULL)",
zError(z_ret), z_ret);
}
} else {
z_ret = inflateReset2(z, Z_RESET_KEEP_WINDOW);
if (z_ret != Z_OK) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
"Bad inflateReset2 error %s(%d) (PULL)",
zError(z_ret), z_ret);
}
}
/* call inflate untill we get Z_STREAM_END or an error */
while (true) {
z_ret = inflate(z, Z_BLOCK);
if (z_ret != Z_OK) break;
}
if (z_ret != Z_STREAM_END) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
"Bad inflate(Z_BLOCK) error %s(%d) (PULL)",
zError(z_ret), z_ret);
}
if (z->avail_in) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
"MSZIP not all avail_in[%u] bytes consumed (PULL)",
z->avail_in);
}
if (z->avail_out) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
"MSZIP not all avail_out[%u] bytes consumed (PULL)",
z->avail_out);
}
if ((plain_chunk_size < 0x00008000) || (ndrpull->offset+4 >= ndrpull->data_size)) {
/* this is the last chunk */
*last = true;
}
return NDR_ERR_SUCCESS;
}
static enum ndr_err_code ndr_push_compression_mszip_chunk(struct ndr_push *ndrpush,
struct ndr_pull *ndrpull,
z_stream *z,
bool *last)
{
DATA_BLOB comp_chunk;
uint32_t comp_chunk_size;
uint32_t comp_chunk_size_offset;
DATA_BLOB plain_chunk;
uint32_t plain_chunk_size;
uint32_t plain_chunk_offset;
uint32_t max_plain_size = 0x00008000;
uint32_t max_comp_size = 0x00008000 + 2 + 12 /*TODO: what value do we really need here?*/;
uint32_t tmp_offset;
int z_ret;
plain_chunk_size = MIN(max_plain_size, ndrpull->data_size - ndrpull->offset);
plain_chunk_offset = ndrpull->offset;
NDR_CHECK(ndr_pull_advance(ndrpull, plain_chunk_size));
plain_chunk.data = ndrpull->data + plain_chunk_offset;
plain_chunk.length = plain_chunk_size;
if (plain_chunk_size < max_plain_size) {
*last = true;
}
NDR_CHECK(ndr_push_uint32(ndrpush, NDR_SCALARS, plain_chunk_size));
comp_chunk_size_offset = ndrpush->offset;
NDR_CHECK(ndr_push_uint32(ndrpush, NDR_SCALARS, 0xFEFEFEFE));
NDR_CHECK(ndr_push_expand(ndrpush, max_comp_size));
comp_chunk.data = ndrpush->data + ndrpush->offset;
comp_chunk.length = max_comp_size;
/* CK = Chris Kirmse, official Microsoft purloiner */
comp_chunk.data[0] = 'C';
comp_chunk.data[1] = 'K';
z->next_in = plain_chunk.data;
z->avail_in = plain_chunk.length;
z->total_in = 0;
z->next_out = comp_chunk.data + 2;
z->avail_out = comp_chunk.length - 2;
z->total_out = 0;
if (!z->opaque) {
/* the first time we need to intialize completely */
z->zalloc = ndr_zlib_alloc;
z->zfree = ndr_zlib_free;
z->opaque = ndrpull;
/* TODO: find how to trigger the same parameters windows uses */
z_ret = deflateInit2(z,
Z_DEFAULT_COMPRESSION,
Z_DEFLATED,
-15,
9,
Z_DEFAULT_STRATEGY);
if (z_ret != Z_OK) {
return ndr_push_error(ndrpush, NDR_ERR_COMPRESSION,
"Bad deflateInit2 error %s(%d) (PUSH)",
zError(z_ret), z_ret);
}
} else {
/* TODO: keep the window */
z_ret = deflateReset(z);
if (z_ret != Z_OK) {
return ndr_push_error(ndrpush, NDR_ERR_COMPRESSION,
"Bad delateReset2 error %s(%d) (PUSH)",
zError(z_ret), z_ret);
}
}
/* call deflate untill we get Z_STREAM_END or an error */
while (true) {
z_ret = deflate(z, Z_FINISH);
if (z_ret != Z_OK) break;
}
if (z_ret != Z_STREAM_END) {
return ndr_push_error(ndrpush, NDR_ERR_COMPRESSION,
"Bad delate(Z_BLOCK) error %s(%d) (PUSH)",
zError(z_ret), z_ret);
}
if (z->avail_in) {
return ndr_push_error(ndrpush, NDR_ERR_COMPRESSION,
"MSZIP not all avail_in[%u] bytes consumed (PUSH)",
z->avail_in);
}
comp_chunk_size = 2 + z->total_out;
tmp_offset = ndrpush->offset;
ndrpush->offset = comp_chunk_size_offset;
NDR_CHECK(ndr_push_uint32(ndrpush, NDR_SCALARS, comp_chunk_size));
ndrpush->offset = tmp_offset;
ndrpush->offset += comp_chunk_size;
return NDR_ERR_SUCCESS;
}
static enum ndr_err_code ndr_pull_compression_xpress_chunk(struct ndr_pull *ndrpull,
struct ndr_push *ndrpush,
bool *last)
{
DATA_BLOB comp_chunk;
DATA_BLOB plain_chunk;
uint32_t comp_chunk_offset;
uint32_t plain_chunk_offset;
uint32_t comp_chunk_size;
uint32_t plain_chunk_size;
NDR_CHECK(ndr_pull_uint32(ndrpull, NDR_SCALARS, &plain_chunk_size));
if (plain_chunk_size > 0x00010000) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION, "Bad XPRESS plain chunk size %08X > 0x00010000 (PULL)",
plain_chunk_size);
}
NDR_CHECK(ndr_pull_uint32(ndrpull, NDR_SCALARS, &comp_chunk_size));
comp_chunk_offset = ndrpull->offset;
NDR_CHECK(ndr_pull_advance(ndrpull, comp_chunk_size));
comp_chunk.length = comp_chunk_size;
comp_chunk.data = ndrpull->data + comp_chunk_offset;
plain_chunk_offset = ndrpush->offset;
NDR_CHECK(ndr_push_zero(ndrpush, plain_chunk_size));
plain_chunk.length = plain_chunk_size;
plain_chunk.data = ndrpush->data + plain_chunk_offset;
DEBUG(10,("XPRESS plain_chunk_size: %08X (%u) comp_chunk_size: %08X (%u)\n",
plain_chunk_size, plain_chunk_size, comp_chunk_size, comp_chunk_size));
/* Uncompressing the buffer using LZ Xpress algorithm */
lzxpress_decompress(&comp_chunk, &plain_chunk);
if ((plain_chunk_size < 0x00010000) || (ndrpull->offset+4 >= ndrpull->data_size)) {
/* this is the last chunk */
*last = true;
}
return NDR_ERR_SUCCESS;
}
static enum ndr_err_code ndr_push_compression_xpress_chunk(struct ndr_push *ndrpush,
struct ndr_pull *ndrpull,
bool *last)
{
return ndr_push_error(ndrpush, NDR_ERR_COMPRESSION, "XPRESS compression is not supported yet (PUSH)");
}
/*
handle compressed subcontext buffers, which in midl land are user-marshalled, but
we use magic in pidl to make them easier to cope with
*/
enum ndr_err_code ndr_pull_compression_start(struct ndr_pull *subndr,
struct ndr_pull **_comndr,
enum ndr_compression_alg compression_alg,
ssize_t decompressed_len)
{
struct ndr_push *ndrpush;
struct ndr_pull *comndr;
DATA_BLOB uncompressed;
bool last = false;
z_stream z;
ndrpush = ndr_push_init_ctx(subndr, subndr->iconv_convenience);
NDR_ERR_HAVE_NO_MEMORY(ndrpush);
switch (compression_alg) {
case NDR_COMPRESSION_MSZIP:
ZERO_STRUCT(z);
while (!last) {
NDR_CHECK(ndr_pull_compression_mszip_chunk(subndr, ndrpush, &z, &last));
}
break;
case NDR_COMPRESSION_XPRESS:
while (!last) {
NDR_CHECK(ndr_pull_compression_xpress_chunk(subndr, ndrpush, &last));
}
break;
default:
return ndr_pull_error(subndr, NDR_ERR_COMPRESSION, "Bad compression algorithm %d (PULL)",
compression_alg);
}
uncompressed = ndr_push_blob(ndrpush);
if (uncompressed.length != decompressed_len) {
return ndr_pull_error(subndr, NDR_ERR_COMPRESSION,
"Bad uncompressed_len [%u] != [%u](0x%08X) (PULL)",
(int)uncompressed.length,
(int)decompressed_len,
(int)decompressed_len);
}
comndr = talloc_zero(subndr, struct ndr_pull);
NDR_ERR_HAVE_NO_MEMORY(comndr);
comndr->flags = subndr->flags;
comndr->current_mem_ctx = subndr->current_mem_ctx;
comndr->data = uncompressed.data;
comndr->data_size = uncompressed.length;
comndr->offset = 0;
comndr->iconv_convenience = talloc_reference(comndr, subndr->iconv_convenience);
*_comndr = comndr;
return NDR_ERR_SUCCESS;
}
enum ndr_err_code ndr_pull_compression_end(struct ndr_pull *subndr,
struct ndr_pull *comndr,
enum ndr_compression_alg compression_alg,
ssize_t decompressed_len)
{
return NDR_ERR_SUCCESS;
}
/*
push a compressed subcontext
*/
enum ndr_err_code ndr_push_compression_start(struct ndr_push *subndr,
struct ndr_push **_uncomndr,
enum ndr_compression_alg compression_alg,
ssize_t decompressed_len)
{
struct ndr_push *uncomndr;
switch (compression_alg) {
case NDR_COMPRESSION_MSZIP:
case NDR_COMPRESSION_XPRESS:
break;
default:
return ndr_push_error(subndr, NDR_ERR_COMPRESSION,
"Bad compression algorithm %d (PUSH)",
compression_alg);
}
uncomndr = ndr_push_init_ctx(subndr, subndr->iconv_convenience);
NDR_ERR_HAVE_NO_MEMORY(uncomndr);
uncomndr->flags = subndr->flags;
*_uncomndr = uncomndr;
return NDR_ERR_SUCCESS;
}
/*
push a compressed subcontext
*/
enum ndr_err_code ndr_push_compression_end(struct ndr_push *subndr,
struct ndr_push *uncomndr,
enum ndr_compression_alg compression_alg,
ssize_t decompressed_len)
{
struct ndr_pull *ndrpull;
bool last = false;
z_stream z;
ndrpull = talloc_zero(uncomndr, struct ndr_pull);
NDR_ERR_HAVE_NO_MEMORY(ndrpull);
ndrpull->flags = uncomndr->flags;
ndrpull->data = uncomndr->data;
ndrpull->data_size = uncomndr->offset;
ndrpull->offset = 0;
ndrpull->iconv_convenience = talloc_reference(ndrpull, subndr->iconv_convenience);
switch (compression_alg) {
case NDR_COMPRESSION_MSZIP:
ZERO_STRUCT(z);
while (!last) {
NDR_CHECK(ndr_push_compression_mszip_chunk(subndr, ndrpull, &z, &last));
}
break;
case NDR_COMPRESSION_XPRESS:
while (!last) {
NDR_CHECK(ndr_push_compression_xpress_chunk(subndr, ndrpull, &last));
}
break;
default:
return ndr_push_error(subndr, NDR_ERR_COMPRESSION, "Bad compression algorithm %d (PUSH)",
compression_alg);
}
talloc_free(uncomndr);
return NDR_ERR_SUCCESS;
}
|