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58964a49 | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
2 | * All rights reserved. |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 7 | * |
d02b48c6 RE |
8 | * This library is free for commercial and non-commercial use as long as |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 14 | * |
d02b48c6 RE |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 21 | * |
d02b48c6 RE |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
d02b48c6 RE |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
d02b48c6 RE |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | ||
58 | #include <stdio.h> | |
f9082268 | 59 | #include <limits.h> |
b39fc560 | 60 | #include "internal/cryptlib.h" |
ec577822 | 61 | #include <openssl/asn1.h> |
d02b48c6 | 62 | |
0f113f3e MC |
63 | static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, |
64 | int max); | |
d02b48c6 | 65 | static void asn1_put_length(unsigned char **pp, int length); |
d02b48c6 | 66 | |
875a644a | 67 | static int _asn1_check_infinite_end(const unsigned char **p, long len) |
0f113f3e MC |
68 | { |
69 | /* | |
70 | * If there is 0 or 1 byte left, the length check should pick things up | |
71 | */ | |
72 | if (len <= 0) | |
73 | return (1); | |
74 | else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) { | |
75 | (*p) += 2; | |
76 | return (1); | |
77 | } | |
78 | return (0); | |
79 | } | |
d02b48c6 | 80 | |
6343829a | 81 | int ASN1_check_infinite_end(unsigned char **p, long len) |
0f113f3e MC |
82 | { |
83 | return _asn1_check_infinite_end((const unsigned char **)p, len); | |
84 | } | |
d02b48c6 | 85 | |
6343829a | 86 | int ASN1_const_check_infinite_end(const unsigned char **p, long len) |
0f113f3e MC |
87 | { |
88 | return _asn1_check_infinite_end(p, len); | |
89 | } | |
875a644a | 90 | |
6343829a | 91 | int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag, |
0f113f3e MC |
92 | int *pclass, long omax) |
93 | { | |
94 | int i, ret; | |
95 | long l; | |
96 | const unsigned char *p = *pp; | |
97 | int tag, xclass, inf; | |
98 | long max = omax; | |
99 | ||
100 | if (!max) | |
101 | goto err; | |
102 | ret = (*p & V_ASN1_CONSTRUCTED); | |
103 | xclass = (*p & V_ASN1_PRIVATE); | |
104 | i = *p & V_ASN1_PRIMITIVE_TAG; | |
105 | if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */ | |
106 | p++; | |
107 | if (--max == 0) | |
108 | goto err; | |
109 | l = 0; | |
110 | while (*p & 0x80) { | |
111 | l <<= 7L; | |
112 | l |= *(p++) & 0x7f; | |
113 | if (--max == 0) | |
114 | goto err; | |
115 | if (l > (INT_MAX >> 7L)) | |
116 | goto err; | |
117 | } | |
118 | l <<= 7L; | |
119 | l |= *(p++) & 0x7f; | |
120 | tag = (int)l; | |
121 | if (--max == 0) | |
122 | goto err; | |
123 | } else { | |
124 | tag = i; | |
125 | p++; | |
126 | if (--max == 0) | |
127 | goto err; | |
128 | } | |
129 | *ptag = tag; | |
130 | *pclass = xclass; | |
131 | if (!asn1_get_length(&p, &inf, plength, (int)max)) | |
132 | goto err; | |
133 | ||
134 | if (inf && !(ret & V_ASN1_CONSTRUCTED)) | |
135 | goto err; | |
398e99fe | 136 | |
0f113f3e MC |
137 | if (*plength > (omax - (p - *pp))) { |
138 | ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG); | |
139 | /* | |
140 | * Set this so that even if things are not long enough the values are | |
141 | * set correctly | |
142 | */ | |
143 | ret |= 0x80; | |
144 | } | |
145 | *pp = p; | |
146 | return (ret | inf); | |
147 | err: | |
148 | ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG); | |
149 | return (0x80); | |
150 | } | |
151 | ||
152 | static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, | |
153 | int max) | |
154 | { | |
155 | const unsigned char *p = *pp; | |
156 | unsigned long ret = 0; | |
157 | unsigned int i; | |
158 | ||
159 | if (max-- < 1) | |
160 | return (0); | |
161 | if (*p == 0x80) { | |
162 | *inf = 1; | |
163 | ret = 0; | |
164 | p++; | |
165 | } else { | |
166 | *inf = 0; | |
167 | i = *p & 0x7f; | |
168 | if (*(p++) & 0x80) { | |
169 | if (max < (int)i) | |
170 | return 0; | |
171 | /* Skip leading zeroes */ | |
172 | while (i && *p == 0) { | |
173 | p++; | |
174 | i--; | |
175 | } | |
176 | if (i > sizeof(long)) | |
177 | return 0; | |
178 | while (i-- > 0) { | |
179 | ret <<= 8L; | |
180 | ret |= *(p++); | |
181 | } | |
182 | } else | |
183 | ret = i; | |
184 | } | |
185 | if (ret > LONG_MAX) | |
186 | return 0; | |
187 | *pp = p; | |
188 | *rl = (long)ret; | |
189 | return (1); | |
190 | } | |
191 | ||
192 | /* | |
193 | * class 0 is constructed constructed == 2 for indefinite length constructed | |
194 | */ | |
6343829a | 195 | void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, |
0f113f3e MC |
196 | int xclass) |
197 | { | |
198 | unsigned char *p = *pp; | |
199 | int i, ttag; | |
200 | ||
201 | i = (constructed) ? V_ASN1_CONSTRUCTED : 0; | |
202 | i |= (xclass & V_ASN1_PRIVATE); | |
203 | if (tag < 31) | |
204 | *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG); | |
205 | else { | |
206 | *(p++) = i | V_ASN1_PRIMITIVE_TAG; | |
207 | for (i = 0, ttag = tag; ttag > 0; i++) | |
208 | ttag >>= 7; | |
209 | ttag = i; | |
210 | while (i-- > 0) { | |
211 | p[i] = tag & 0x7f; | |
212 | if (i != (ttag - 1)) | |
213 | p[i] |= 0x80; | |
214 | tag >>= 7; | |
215 | } | |
216 | p += ttag; | |
217 | } | |
218 | if (constructed == 2) | |
219 | *(p++) = 0x80; | |
220 | else | |
221 | asn1_put_length(&p, length); | |
222 | *pp = p; | |
223 | } | |
d02b48c6 | 224 | |
230fd6b7 | 225 | int ASN1_put_eoc(unsigned char **pp) |
0f113f3e MC |
226 | { |
227 | unsigned char *p = *pp; | |
228 | *p++ = 0; | |
229 | *p++ = 0; | |
230 | *pp = p; | |
231 | return 2; | |
232 | } | |
230fd6b7 | 233 | |
6b691a5c | 234 | static void asn1_put_length(unsigned char **pp, int length) |
0f113f3e MC |
235 | { |
236 | unsigned char *p = *pp; | |
237 | int i, l; | |
238 | if (length <= 127) | |
239 | *(p++) = (unsigned char)length; | |
240 | else { | |
241 | l = length; | |
242 | for (i = 0; l > 0; i++) | |
243 | l >>= 8; | |
244 | *(p++) = i | 0x80; | |
245 | l = i; | |
246 | while (i-- > 0) { | |
247 | p[i] = length & 0xff; | |
248 | length >>= 8; | |
249 | } | |
250 | p += l; | |
251 | } | |
252 | *pp = p; | |
253 | } | |
d02b48c6 | 254 | |
6343829a | 255 | int ASN1_object_size(int constructed, int length, int tag) |
0f113f3e MC |
256 | { |
257 | int ret; | |
258 | ||
259 | ret = length; | |
260 | ret++; | |
261 | if (tag >= 31) { | |
262 | while (tag > 0) { | |
263 | tag >>= 7; | |
264 | ret++; | |
265 | } | |
266 | } | |
267 | if (constructed == 2) | |
268 | return ret + 3; | |
269 | ret++; | |
270 | if (length > 127) { | |
271 | while (length > 0) { | |
272 | length >>= 8; | |
273 | ret++; | |
274 | } | |
275 | } | |
276 | return (ret); | |
277 | } | |
d02b48c6 | 278 | |
18f54773 | 279 | int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str) |
0f113f3e MC |
280 | { |
281 | if (str == NULL) | |
282 | return 0; | |
283 | dst->type = str->type; | |
284 | if (!ASN1_STRING_set(dst, str->data, str->length)) | |
285 | return 0; | |
4002da0f DSH |
286 | /* Copy flags but preserve embed value */ |
287 | dst->flags &= ASN1_STRING_FLAG_EMBED; | |
288 | dst->flags |= str->flags & ~ASN1_STRING_FLAG_EMBED; | |
0f113f3e MC |
289 | return 1; |
290 | } | |
18f54773 | 291 | |
6384e46d | 292 | ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str) |
0f113f3e MC |
293 | { |
294 | ASN1_STRING *ret; | |
295 | if (!str) | |
296 | return NULL; | |
297 | ret = ASN1_STRING_new(); | |
90945fa3 | 298 | if (ret == NULL) |
0f113f3e MC |
299 | return NULL; |
300 | if (!ASN1_STRING_copy(ret, str)) { | |
301 | ASN1_STRING_free(ret); | |
302 | return NULL; | |
303 | } | |
304 | return ret; | |
305 | } | |
d02b48c6 | 306 | |
6343829a | 307 | int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) |
0f113f3e MC |
308 | { |
309 | unsigned char *c; | |
310 | const char *data = _data; | |
311 | ||
312 | if (len < 0) { | |
313 | if (data == NULL) | |
314 | return (0); | |
315 | else | |
316 | len = strlen(data); | |
317 | } | |
318 | if ((str->length < len) || (str->data == NULL)) { | |
319 | c = str->data; | |
2d29e2df | 320 | str->data = OPENSSL_realloc(c, len + 1); |
0f113f3e MC |
321 | if (str->data == NULL) { |
322 | ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE); | |
323 | str->data = c; | |
324 | return (0); | |
325 | } | |
326 | } | |
327 | str->length = len; | |
328 | if (data != NULL) { | |
329 | memcpy(str->data, data, len); | |
330 | /* an allowance for strings :-) */ | |
331 | str->data[len] = '\0'; | |
332 | } | |
333 | return (1); | |
334 | } | |
d02b48c6 | 335 | |
6343829a | 336 | void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len) |
0f113f3e | 337 | { |
b548a1f1 | 338 | OPENSSL_free(str->data); |
0f113f3e MC |
339 | str->data = data; |
340 | str->length = len; | |
341 | } | |
399a6f0b | 342 | |
6b691a5c | 343 | ASN1_STRING *ASN1_STRING_new(void) |
0f113f3e MC |
344 | { |
345 | return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); | |
346 | } | |
d02b48c6 | 347 | |
6b691a5c | 348 | ASN1_STRING *ASN1_STRING_type_new(int type) |
0f113f3e MC |
349 | { |
350 | ASN1_STRING *ret; | |
351 | ||
64b25758 | 352 | ret = OPENSSL_zalloc(sizeof(*ret)); |
0f113f3e MC |
353 | if (ret == NULL) { |
354 | ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE); | |
355 | return (NULL); | |
356 | } | |
0f113f3e | 357 | ret->type = type; |
0f113f3e MC |
358 | return (ret); |
359 | } | |
d02b48c6 | 360 | |
6b691a5c | 361 | void ASN1_STRING_free(ASN1_STRING *a) |
0f113f3e MC |
362 | { |
363 | if (a == NULL) | |
364 | return; | |
b548a1f1 | 365 | if (!(a->flags & ASN1_STRING_FLAG_NDEF)) |
0f113f3e | 366 | OPENSSL_free(a->data); |
47c9a1b5 DSH |
367 | if (!(a->flags & ASN1_STRING_FLAG_EMBED)) |
368 | OPENSSL_free(a); | |
0f113f3e | 369 | } |
d02b48c6 | 370 | |
a8ae0891 DSH |
371 | void ASN1_STRING_clear_free(ASN1_STRING *a) |
372 | { | |
0dfb9398 RS |
373 | if (a == NULL) |
374 | return; | |
375 | if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) | |
a8ae0891 DSH |
376 | OPENSSL_cleanse(a->data, a->length); |
377 | ASN1_STRING_free(a); | |
378 | } | |
379 | ||
6384e46d | 380 | int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) |
0f113f3e MC |
381 | { |
382 | int i; | |
383 | ||
384 | i = (a->length - b->length); | |
385 | if (i == 0) { | |
386 | i = memcmp(a->data, b->data, a->length); | |
387 | if (i == 0) | |
388 | return (a->type - b->type); | |
389 | else | |
390 | return (i); | |
391 | } else | |
392 | return (i); | |
393 | } | |
d02b48c6 | 394 | |
6343829a | 395 | int ASN1_STRING_length(const ASN1_STRING *x) |
0f113f3e | 396 | { |
f422a514 | 397 | return x->length; |
0f113f3e | 398 | } |
08e9c1af | 399 | |
6343829a | 400 | void ASN1_STRING_length_set(ASN1_STRING *x, int len) |
0f113f3e | 401 | { |
f422a514 | 402 | x->length = len; |
0f113f3e | 403 | } |
08e9c1af DSH |
404 | |
405 | int ASN1_STRING_type(ASN1_STRING *x) | |
0f113f3e | 406 | { |
f422a514 | 407 | return x->type; |
0f113f3e MC |
408 | } |
409 | ||
410 | unsigned char *ASN1_STRING_data(ASN1_STRING *x) | |
411 | { | |
f422a514 | 412 | return x->data; |
0f113f3e | 413 | } |