Line data Source code
1 : /* crypto/asn1/asn1_lib.c */
2 : /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 : * All rights reserved.
4 : *
5 : * This package is an SSL implementation written
6 : * by Eric Young (eay@cryptsoft.com).
7 : * The implementation was written so as to conform with Netscapes SSL.
8 : *
9 : * This library is free for commercial and non-commercial use as long as
10 : * the following conditions are aheared to. The following conditions
11 : * apply to all code found in this distribution, be it the RC4, RSA,
12 : * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 : * included with this distribution is covered by the same copyright terms
14 : * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 : *
16 : * Copyright remains Eric Young's, and as such any Copyright notices in
17 : * the code are not to be removed.
18 : * If this package is used in a product, Eric Young should be given attribution
19 : * as the author of the parts of the library used.
20 : * This can be in the form of a textual message at program startup or
21 : * in documentation (online or textual) provided with the package.
22 : *
23 : * Redistribution and use in source and binary forms, with or without
24 : * modification, are permitted provided that the following conditions
25 : * are met:
26 : * 1. Redistributions of source code must retain the copyright
27 : * notice, this list of conditions and the following disclaimer.
28 : * 2. Redistributions in binary form must reproduce the above copyright
29 : * notice, this list of conditions and the following disclaimer in the
30 : * documentation and/or other materials provided with the distribution.
31 : * 3. All advertising materials mentioning features or use of this software
32 : * must display the following acknowledgement:
33 : * "This product includes cryptographic software written by
34 : * Eric Young (eay@cryptsoft.com)"
35 : * The word 'cryptographic' can be left out if the rouines from the library
36 : * being used are not cryptographic related :-).
37 : * 4. If you include any Windows specific code (or a derivative thereof) from
38 : * the apps directory (application code) you must include an acknowledgement:
39 : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 : *
41 : * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 : * SUCH DAMAGE.
52 : *
53 : * The licence and distribution terms for any publically available version or
54 : * derivative of this code cannot be changed. i.e. this code cannot simply be
55 : * copied and put under another distribution licence
56 : * [including the GNU Public Licence.]
57 : */
58 :
59 : #include <stdio.h>
60 : #include <limits.h>
61 : #include "cryptlib.h"
62 : #include <openssl/asn1.h>
63 : #include <openssl/asn1_mac.h>
64 :
65 : static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
66 : int max);
67 : static void asn1_put_length(unsigned char **pp, int length);
68 : const char ASN1_version[] = "ASN.1" OPENSSL_VERSION_PTEXT;
69 :
70 : static int _asn1_check_infinite_end(const unsigned char **p, long len)
71 : {
72 : /*
73 : * If there is 0 or 1 byte left, the length check should pick things up
74 : */
75 0 : if (len <= 0)
76 : return (1);
77 0 : else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
78 0 : (*p) += 2;
79 : return (1);
80 : }
81 : return (0);
82 : }
83 :
84 0 : int ASN1_check_infinite_end(unsigned char **p, long len)
85 : {
86 0 : return _asn1_check_infinite_end((const unsigned char **)p, len);
87 : }
88 :
89 0 : int ASN1_const_check_infinite_end(const unsigned char **p, long len)
90 : {
91 0 : return _asn1_check_infinite_end(p, len);
92 : }
93 :
94 134402 : int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
95 : int *pclass, long omax)
96 : {
97 : int i, ret;
98 : long l;
99 134402 : const unsigned char *p = *pp;
100 : int tag, xclass, inf;
101 : long max = omax;
102 :
103 134402 : if (!max)
104 : goto err;
105 134402 : ret = (*p & V_ASN1_CONSTRUCTED);
106 134402 : xclass = (*p & V_ASN1_PRIVATE);
107 134402 : i = *p & V_ASN1_PRIMITIVE_TAG;
108 134402 : if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
109 0 : p++;
110 0 : if (--max == 0)
111 : goto err;
112 : l = 0;
113 0 : while (*p & 0x80) {
114 0 : l <<= 7L;
115 0 : l |= *(p++) & 0x7f;
116 0 : if (--max == 0)
117 : goto err;
118 0 : if (l > (INT_MAX >> 7L))
119 : goto err;
120 : }
121 0 : l <<= 7L;
122 0 : l |= *(p++) & 0x7f;
123 0 : tag = (int)l;
124 0 : if (--max == 0)
125 : goto err;
126 : } else {
127 : tag = i;
128 134402 : p++;
129 134402 : if (--max == 0)
130 : goto err;
131 : }
132 134402 : *ptag = tag;
133 134402 : *pclass = xclass;
134 134402 : if (!asn1_get_length(&p, &inf, plength, (int)max))
135 : goto err;
136 :
137 134402 : if (inf && !(ret & V_ASN1_CONSTRUCTED))
138 : goto err;
139 :
140 : #if 0
141 : fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n",
142 : (int)p, *plength, omax, (int)*pp, (int)(p + *plength),
143 : (int)(omax + *pp));
144 :
145 : #endif
146 134402 : if (*plength > (omax - (p - *pp))) {
147 0 : ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
148 : /*
149 : * Set this so that even if things are not long enough the values are
150 : * set correctly
151 : */
152 0 : ret |= 0x80;
153 : }
154 134402 : *pp = p;
155 134402 : return (ret | inf);
156 : err:
157 0 : ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
158 0 : return (0x80);
159 : }
160 :
161 134402 : static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
162 : int max)
163 : {
164 134402 : const unsigned char *p = *pp;
165 : unsigned long ret = 0;
166 : unsigned int i;
167 :
168 134402 : if (max-- < 1)
169 : return (0);
170 134402 : if (*p == 0x80) {
171 0 : *inf = 1;
172 : ret = 0;
173 0 : p++;
174 : } else {
175 134402 : *inf = 0;
176 134402 : i = *p & 0x7f;
177 134402 : if (*(p++) & 0x80) {
178 12057 : if (i > sizeof(long))
179 : return 0;
180 12057 : if (max-- == 0)
181 : return (0);
182 27950 : while (i-- > 0) {
183 15893 : ret <<= 8L;
184 15893 : ret |= *(p++);
185 15893 : if (max-- == 0)
186 : return (0);
187 : }
188 : } else
189 122345 : ret = i;
190 : }
191 134402 : if (ret > LONG_MAX)
192 : return 0;
193 134402 : *pp = p;
194 134402 : *rl = (long)ret;
195 134402 : return (1);
196 : }
197 :
198 : /*
199 : * class 0 is constructed constructed == 2 for indefinite length constructed
200 : */
201 81724 : void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
202 : int xclass)
203 : {
204 81724 : unsigned char *p = *pp;
205 : int i, ttag;
206 :
207 81724 : i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
208 81724 : i |= (xclass & V_ASN1_PRIVATE);
209 81724 : if (tag < 31)
210 81724 : *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
211 : else {
212 0 : *(p++) = i | V_ASN1_PRIMITIVE_TAG;
213 0 : for (i = 0, ttag = tag; ttag > 0; i++)
214 0 : ttag >>= 7;
215 : ttag = i;
216 0 : while (i-- > 0) {
217 0 : p[i] = tag & 0x7f;
218 0 : if (i != (ttag - 1))
219 0 : p[i] |= 0x80;
220 0 : tag >>= 7;
221 : }
222 0 : p += ttag;
223 : }
224 81724 : if (constructed == 2)
225 0 : *(p++) = 0x80;
226 : else
227 81724 : asn1_put_length(&p, length);
228 81724 : *pp = p;
229 81724 : }
230 :
231 0 : int ASN1_put_eoc(unsigned char **pp)
232 : {
233 0 : unsigned char *p = *pp;
234 0 : *p++ = 0;
235 0 : *p++ = 0;
236 0 : *pp = p;
237 0 : return 2;
238 : }
239 :
240 81724 : static void asn1_put_length(unsigned char **pp, int length)
241 : {
242 81724 : unsigned char *p = *pp;
243 : int i, l;
244 81724 : if (length <= 127)
245 78904 : *(p++) = (unsigned char)length;
246 : else {
247 : l = length;
248 4230 : for (i = 0; l > 0; i++)
249 4230 : l >>= 8;
250 2820 : *(p++) = i | 0x80;
251 : l = i;
252 9870 : while (i-- > 0) {
253 4230 : p[i] = length & 0xff;
254 4230 : length >>= 8;
255 : }
256 2820 : p += l;
257 : }
258 81724 : *pp = p;
259 81724 : }
260 :
261 258730 : int ASN1_object_size(int constructed, int length, int tag)
262 : {
263 : int ret;
264 :
265 : ret = length;
266 258730 : ret++;
267 258730 : if (tag >= 31) {
268 0 : while (tag > 0) {
269 0 : tag >>= 7;
270 0 : ret++;
271 : }
272 : }
273 258730 : if (constructed == 2)
274 0 : return ret + 3;
275 258730 : ret++;
276 258730 : if (length > 127) {
277 16920 : while (length > 0) {
278 9870 : length >>= 8;
279 9870 : ret++;
280 : }
281 : }
282 258730 : return (ret);
283 : }
284 :
285 367 : static int _asn1_Finish(ASN1_const_CTX *c)
286 : {
287 367 : if ((c->inf == (1 | V_ASN1_CONSTRUCTED)) && (!c->eos)) {
288 0 : if (!ASN1_const_check_infinite_end(&c->p, c->slen)) {
289 0 : c->error = ERR_R_MISSING_ASN1_EOS;
290 0 : return (0);
291 : }
292 : }
293 367 : if (((c->slen != 0) && !(c->inf & 1)) || ((c->slen < 0) && (c->inf & 1))) {
294 0 : c->error = ERR_R_ASN1_LENGTH_MISMATCH;
295 0 : return (0);
296 : }
297 : return (1);
298 : }
299 :
300 0 : int asn1_Finish(ASN1_CTX *c)
301 : {
302 0 : return _asn1_Finish((ASN1_const_CTX *)c);
303 : }
304 :
305 367 : int asn1_const_Finish(ASN1_const_CTX *c)
306 : {
307 367 : return _asn1_Finish(c);
308 : }
309 :
310 367 : int asn1_GetSequence(ASN1_const_CTX *c, long *length)
311 : {
312 : const unsigned char *q;
313 :
314 367 : q = c->p;
315 367 : c->inf = ASN1_get_object(&(c->p), &(c->slen), &(c->tag), &(c->xclass),
316 : *length);
317 367 : if (c->inf & 0x80) {
318 0 : c->error = ERR_R_BAD_GET_ASN1_OBJECT_CALL;
319 0 : return (0);
320 : }
321 367 : if (c->tag != V_ASN1_SEQUENCE) {
322 0 : c->error = ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
323 0 : return (0);
324 : }
325 367 : (*length) -= (c->p - q);
326 367 : if (c->max && (*length < 0)) {
327 0 : c->error = ERR_R_ASN1_LENGTH_MISMATCH;
328 0 : return (0);
329 : }
330 367 : if (c->inf == (1 | V_ASN1_CONSTRUCTED))
331 0 : c->slen = *length + *(c->pp) - c->p;
332 367 : c->eos = 0;
333 367 : return (1);
334 : }
335 :
336 3675 : int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
337 : {
338 3675 : if (str == NULL)
339 : return 0;
340 3675 : dst->type = str->type;
341 3675 : if (!ASN1_STRING_set(dst, str->data, str->length))
342 : return 0;
343 3675 : dst->flags = str->flags;
344 3675 : return 1;
345 : }
346 :
347 3675 : ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
348 : {
349 : ASN1_STRING *ret;
350 3675 : if (!str)
351 : return NULL;
352 : ret = ASN1_STRING_new();
353 3675 : if (!ret)
354 : return NULL;
355 3675 : if (!ASN1_STRING_copy(ret, str)) {
356 0 : ASN1_STRING_free(ret);
357 0 : return NULL;
358 : }
359 : return ret;
360 : }
361 :
362 44120 : int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
363 : {
364 : unsigned char *c;
365 : const char *data = _data;
366 :
367 44120 : if (len < 0) {
368 0 : if (data == NULL)
369 : return (0);
370 : else
371 0 : len = strlen(data);
372 : }
373 44120 : if ((str->length < len) || (str->data == NULL)) {
374 43753 : c = str->data;
375 43753 : if (c == NULL)
376 43386 : str->data = OPENSSL_malloc(len + 1);
377 : else
378 367 : str->data = OPENSSL_realloc(c, len + 1);
379 :
380 43753 : if (str->data == NULL) {
381 0 : ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
382 0 : str->data = c;
383 0 : return (0);
384 : }
385 : }
386 44120 : str->length = len;
387 44120 : if (data != NULL) {
388 44120 : memcpy(str->data, data, len);
389 : /* an allowance for strings :-) */
390 44120 : str->data[len] = '\0';
391 : }
392 : return (1);
393 : }
394 :
395 0 : void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
396 : {
397 0 : if (str->data)
398 0 : OPENSSL_free(str->data);
399 0 : str->data = data;
400 0 : str->length = len;
401 0 : }
402 :
403 0 : ASN1_STRING *ASN1_STRING_new(void)
404 : {
405 3675 : return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
406 : }
407 :
408 53964 : ASN1_STRING *ASN1_STRING_type_new(int type)
409 : {
410 : ASN1_STRING *ret;
411 :
412 53964 : ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
413 53964 : if (ret == NULL) {
414 0 : ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
415 0 : return (NULL);
416 : }
417 53964 : ret->length = 0;
418 53964 : ret->type = type;
419 53964 : ret->data = NULL;
420 53964 : ret->flags = 0;
421 53964 : return (ret);
422 : }
423 :
424 53961 : void ASN1_STRING_free(ASN1_STRING *a)
425 : {
426 53961 : if (a == NULL)
427 53963 : return;
428 53961 : if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
429 53961 : OPENSSL_free(a->data);
430 53964 : OPENSSL_free(a);
431 : }
432 :
433 0 : void ASN1_STRING_clear_free(ASN1_STRING *a)
434 : {
435 0 : if (a && a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
436 0 : OPENSSL_cleanse(a->data, a->length);
437 0 : ASN1_STRING_free(a);
438 0 : }
439 :
440 0 : int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
441 : {
442 : int i;
443 :
444 0 : i = (a->length - b->length);
445 0 : if (i == 0) {
446 0 : i = memcmp(a->data, b->data, a->length);
447 0 : if (i == 0)
448 0 : return (a->type - b->type);
449 : else
450 : return (i);
451 : } else
452 : return (i);
453 : }
454 :
455 0 : void asn1_add_error(const unsigned char *address, int offset)
456 : {
457 : char buf1[DECIMAL_SIZE(address) + 1], buf2[DECIMAL_SIZE(offset) + 1];
458 :
459 0 : BIO_snprintf(buf1, sizeof buf1, "%lu", (unsigned long)address);
460 0 : BIO_snprintf(buf2, sizeof buf2, "%d", offset);
461 0 : ERR_add_error_data(4, "address=", buf1, " offset=", buf2);
462 0 : }
463 :
464 0 : int ASN1_STRING_length(const ASN1_STRING *x)
465 : {
466 0 : return M_ASN1_STRING_length(x);
467 : }
468 :
469 0 : void ASN1_STRING_length_set(ASN1_STRING *x, int len)
470 : {
471 0 : M_ASN1_STRING_length_set(x, len);
472 0 : return;
473 : }
474 :
475 0 : int ASN1_STRING_type(ASN1_STRING *x)
476 : {
477 0 : return M_ASN1_STRING_type(x);
478 : }
479 :
480 0 : unsigned char *ASN1_STRING_data(ASN1_STRING *x)
481 : {
482 0 : return M_ASN1_STRING_data(x);
483 : }
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