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s3:dbwrap_watch: prepare dbwrap_watched_record_storev() to store watchers if requested
[Samba.git] / libcli / auth / msrpc_parse.c
blob86ba2ec00d4d4d569db59a47e3d08969a25eeef6
1 /*
2 Unix SMB/CIFS implementation.
3 simple kerberos5/SPNEGO routines
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
6 Copyright (C) Andrew Bartlett 2002-2003
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "libcli/auth/msrpc_parse.h"
24
25 /*
26 this is a tiny msrpc packet generator. I am only using this to
27 avoid tying this code to a particular varient of our rpc code. This
28 generator is not general enough for all our rpc needs, its just
29 enough for the spnego/ntlmssp code
30
31 format specifiers are:
32
33 U = unicode string (input is unix string)
34 a = address (input is char *unix_string)
35 (1 byte type, 1 byte length, unicode/ASCII string, all inline)
36 A = ASCII string (input is unix string)
37 B = data blob (pointer + length)
38 b = data blob in header (pointer + length)
39 D
40 d = word (4 bytes)
41 C = constant ascii string
42 */
43 NTSTATUS msrpc_gen(TALLOC_CTX *mem_ctx,
44 DATA_BLOB *blob,
45 const char *format, ...)
46 {
47 int i, j;
48 bool ret;
49 va_list ap;
50 char *s;
51 uint8_t *b;
52 int head_size=0, data_size=0;
53 int head_ofs, data_ofs;
54 int *intargs;
55 size_t n;
56
57 DATA_BLOB *pointers;
58
59 pointers = talloc_array(mem_ctx, DATA_BLOB, strlen(format));
60 if (!pointers) {
61 return NT_STATUS_NO_MEMORY;
62 }
63 intargs = talloc_array(pointers, int, strlen(format));
64 if (!intargs) {
65 return NT_STATUS_NO_MEMORY;
66 }
67
68 /* first scan the format to work out the header and body size */
69 va_start(ap, format);
70 for (i=0; format[i]; i++) {
71 switch (format[i]) {
72 case 'U':
73 s = va_arg(ap, char *);
74 head_size += 8;
75 ret = push_ucs2_talloc(
76 pointers,
77 (smb_ucs2_t **)(void *)&pointers[i].data,
78 s, &n);
79 if (!ret) {
80 va_end(ap);
81 return map_nt_error_from_unix_common(errno);
82 }
83 pointers[i].length = n;
84 pointers[i].length -= 2;
85 data_size += pointers[i].length;
86 break;
87 case 'A':
88 s = va_arg(ap, char *);
89 head_size += 8;
90 ret = push_ascii_talloc(
91 pointers, (char **)(void *)&pointers[i].data,
92 s, &n);
93 if (!ret) {
94 va_end(ap);
95 return map_nt_error_from_unix_common(errno);
96 }
97 pointers[i].length = n;
98 pointers[i].length -= 1;
99 data_size += pointers[i].length;
100 break;
101 case 'a':
102 j = va_arg(ap, int);
103 intargs[i] = j;
104 s = va_arg(ap, char *);
105 ret = push_ucs2_talloc(
106 pointers,
107 (smb_ucs2_t **)(void *)&pointers[i].data,
108 s, &n);
109 if (!ret) {
110 va_end(ap);
111 return map_nt_error_from_unix_common(errno);
112 }
113 pointers[i].length = n;
114 pointers[i].length -= 2;
115 data_size += pointers[i].length + 4;
116 break;
117 case 'B':
118 b = va_arg(ap, uint8_t *);
119 head_size += 8;
120 pointers[i].data = b;
121 pointers[i].length = va_arg(ap, int);
122 data_size += pointers[i].length;
123 break;
124 case 'b':
125 b = va_arg(ap, uint8_t *);
126 pointers[i].data = b;
127 pointers[i].length = va_arg(ap, int);
128 head_size += pointers[i].length;
129 break;
130 case 'd':
131 j = va_arg(ap, int);
132 intargs[i] = j;
133 head_size += 4;
134 break;
135 case 'C':
136 s = va_arg(ap, char *);
137 pointers[i].data = (uint8_t *)s;
138 pointers[i].length = strlen(s)+1;
139 head_size += pointers[i].length;
140 break;
141 default:
142 va_end(ap);
143 return NT_STATUS_INVALID_PARAMETER;
144 }
145 }
146 va_end(ap);
147
148 if (head_size + data_size == 0) {
149 return NT_STATUS_INVALID_PARAMETER;
150 }
151
152 /* allocate the space, then scan the format again to fill in the values */
153 *blob = data_blob_talloc(mem_ctx, NULL, head_size + data_size);
154 if (!blob->data) {
155 return NT_STATUS_NO_MEMORY;
156 }
157 head_ofs = 0;
158 data_ofs = head_size;
159
160 va_start(ap, format);
161 for (i=0; format[i]; i++) {
162 switch (format[i]) {
163 case 'U':
164 case 'A':
165 case 'B':
166 n = pointers[i].length;
167 SSVAL(blob->data, head_ofs, n); head_ofs += 2;
168 SSVAL(blob->data, head_ofs, n); head_ofs += 2;
169 SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
170 if (pointers[i].data && n) /* don't follow null pointers... */
171 memcpy(blob->data+data_ofs, pointers[i].data, n);
172 data_ofs += n;
173 break;
174 case 'a':
175 j = intargs[i];
176 SSVAL(blob->data, data_ofs, j); data_ofs += 2;
177
178 n = pointers[i].length;
179 SSVAL(blob->data, data_ofs, n); data_ofs += 2;
180 memcpy(blob->data+data_ofs, pointers[i].data, n);
181 data_ofs += n;
182 break;
183 case 'd':
184 j = intargs[i];
185 SIVAL(blob->data, head_ofs, j);
186 head_ofs += 4;
187 break;
188 case 'b':
189 n = pointers[i].length;
190 if (pointers[i].data && n) {
191 /* don't follow null pointers... */
192 memcpy(blob->data + head_ofs, pointers[i].data, n);
193 }
194 head_ofs += n;
195 break;
196 case 'C':
197 n = pointers[i].length;
198 memcpy(blob->data + head_ofs, pointers[i].data, n);
199 head_ofs += n;
200 break;
201 default:
202 va_end(ap);
203 return NT_STATUS_INVALID_PARAMETER;
204 }
205 }
206 va_end(ap);
207
208 talloc_free(pointers);
209
210 return NT_STATUS_OK;
211 }
212
213
214 /* a helpful macro to avoid running over the end of our blob */
215 #define NEED_DATA(amount) \
216 if ((head_ofs + amount) > blob->length) { \
217 va_end(ap); \
218 return false; \
219 }
220
221 /**
222 this is a tiny msrpc packet parser. This the the partner of msrpc_gen
223
224 format specifiers are:
225
226 U = unicode string (output is unix string)
227 A = ascii string
228 B = data blob
229 b = data blob in header
230 d = word (4 bytes)
231 C = constant ascii string
232 */
233
234 bool msrpc_parse(TALLOC_CTX *mem_ctx,
235 const DATA_BLOB *blob,
236 const char *format, ...)
237 {
238 int i;
239 va_list ap;
240 char **ps, *s;
241 DATA_BLOB *b;
242 size_t head_ofs = 0;
243 uint16_t len1, len2;
244 uint32_t ptr;
245 uint32_t *v;
246 bool ret = true;
247
248 va_start(ap, format);
249 for (i=0; format[i]; i++) {
250 switch (format[i]) {
251 case 'U':
252 NEED_DATA(8);
253 len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
254 len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
255 ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
256
257 ps = va_arg(ap, char **);
258 if (len1 == 0 && len2 == 0) {
259 *ps = talloc_strdup(mem_ctx, "");
260 if (*ps == NULL) {
261 ret = false;
262 goto cleanup;
263 }
264 } else {
265 /* make sure its in the right format - be strict */
266 if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
267 ret = false;
268 goto cleanup;
269 }
270 if (len1 & 1) {
271 /* if odd length and unicode */
272 ret = false;
273 goto cleanup;
274 }
275 if (blob->data + ptr < (uint8_t *)(uintptr_t)ptr ||
276 blob->data + ptr < blob->data) {
277 ret = false;
278 goto cleanup;
279 }
280
281 if (0 < len1) {
282 size_t pull_len;
283 if (!convert_string_talloc(mem_ctx, CH_UTF16, CH_UNIX,
284 blob->data + ptr, len1,
285 ps, &pull_len)) {
286 ret = false;
287 goto cleanup;
288 }
289 } else {
290 *ps = talloc_strdup(mem_ctx, "");
291 if (*ps == NULL) {
292 ret = false;
293 goto cleanup;
294 }
295 }
296 }
297 break;
298 case 'A':
299 NEED_DATA(8);
300 len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
301 len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
302 ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
303
304 ps = (char **)va_arg(ap, char **);
305 /* make sure its in the right format - be strict */
306 if (len1 == 0 && len2 == 0) {
307 *ps = talloc_strdup(mem_ctx, "");
308 if (*ps == NULL) {
309 ret = false;
310 goto cleanup;
311 }
312 } else {
313 if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
314 ret = false;
315 goto cleanup;
316 }
317
318 if (blob->data + ptr < (uint8_t *)(uintptr_t)ptr ||
319 blob->data + ptr < blob->data) {
320 ret = false;
321 goto cleanup;
322 }
323
324 if (0 < len1) {
325 size_t pull_len;
326
327 if (!convert_string_talloc(mem_ctx, CH_DOS, CH_UNIX,
328 blob->data + ptr, len1,
329 ps, &pull_len)) {
330 ret = false;
331 goto cleanup;
332 }
333 } else {
334 *ps = talloc_strdup(mem_ctx, "");
335 if (*ps == NULL) {
336 ret = false;
337 goto cleanup;
338 }
339 }
340 }
341 break;
342 case 'B':
343 NEED_DATA(8);
344 len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
345 len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
346 ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
347
348 b = (DATA_BLOB *)va_arg(ap, void *);
349 if (len1 == 0 && len2 == 0) {
350 *b = data_blob_talloc(mem_ctx, NULL, 0);
351 } else {
352 /* make sure its in the right format - be strict */
353 if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) {
354 ret = false;
355 goto cleanup;
356 }
357
358 if (blob->data + ptr < (uint8_t *)(uintptr_t)ptr ||
359 blob->data + ptr < blob->data) {
360 ret = false;
361 goto cleanup;
362 }
363
364 *b = data_blob_talloc(mem_ctx, blob->data + ptr, len1);
365 }
366 break;
367 case 'b':
368 b = (DATA_BLOB *)va_arg(ap, void *);
369 len1 = va_arg(ap, unsigned int);
370 /* make sure its in the right format - be strict */
371 NEED_DATA(len1);
372 if (blob->data + head_ofs < (uint8_t *)head_ofs ||
373 blob->data + head_ofs < blob->data) {
374 ret = false;
375 goto cleanup;
376 }
377
378 *b = data_blob_talloc(mem_ctx, blob->data + head_ofs, len1);
379 head_ofs += len1;
380 break;
381 case 'd':
382 v = va_arg(ap, uint32_t *);
383 NEED_DATA(4);
384 *v = IVAL(blob->data, head_ofs); head_ofs += 4;
385 break;
386 case 'C':
387 s = va_arg(ap, char *);
388
389 if (blob->data + head_ofs < (uint8_t *)head_ofs ||
390 blob->data + head_ofs < blob->data ||
391 (head_ofs + (strlen(s) + 1)) > blob->length) {
392 ret = false;
393 goto cleanup;
394 }
395
396 if (memcmp(blob->data + head_ofs, s, strlen(s)+1) != 0) {
397 ret = false;
398 goto cleanup;
399 }
400 head_ofs += (strlen(s) + 1);
401
402 break;
403 }
404 }
405
406 cleanup:
407 va_end(ap);
408 return ret;
409 }
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