1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
7 *
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).
14 *
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.
21 *
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 :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
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.
51 *
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 #include <openssl/asn1.h>
58
59 #include <limits.h>
60 #include <string.h>
61
62 #include <openssl/asn1_mac.h>
63 #include <openssl/err.h>
64 #include <openssl/mem.h>
65
66 #include "../internal.h"
67
68
69 /* Cross-module errors from crypto/x509/i2d_pr.c. */
70 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_PUBLIC_KEY_TYPE)
71
72 /* Cross-module errors from crypto/x509/algorithm.c. */
73 OPENSSL_DECLARE_ERROR_REASON(ASN1, CONTEXT_NOT_INITIALISED)
74 OPENSSL_DECLARE_ERROR_REASON(ASN1, DIGEST_AND_KEY_TYPE_NOT_SUPPORTED)
75 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_MESSAGE_DIGEST_ALGORITHM)
76 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_SIGNATURE_ALGORITHM)
77 OPENSSL_DECLARE_ERROR_REASON(ASN1, WRONG_PUBLIC_KEY_TYPE)
78 /*
79 * Cross-module errors from crypto/x509/asn1_gen.c. TODO(davidben): Remove
80 * these once asn1_gen.c is gone.
81 */
82 OPENSSL_DECLARE_ERROR_REASON(ASN1, DEPTH_EXCEEDED)
83 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BITSTRING_FORMAT)
84 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BOOLEAN)
85 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_FORMAT)
86 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_HEX)
87 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_IMPLICIT_TAG)
88 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_INTEGER)
89 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NESTED_TAGGING)
90 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NULL_VALUE)
91 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_OBJECT)
92 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_TIME_VALUE)
93 OPENSSL_DECLARE_ERROR_REASON(ASN1, INTEGER_NOT_ASCII_FORMAT)
94 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_MODIFIER)
95 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_NUMBER)
96 OPENSSL_DECLARE_ERROR_REASON(ASN1, LIST_ERROR)
97 OPENSSL_DECLARE_ERROR_REASON(ASN1, MISSING_VALUE)
98 OPENSSL_DECLARE_ERROR_REASON(ASN1, NOT_ASCII_FORMAT)
99 OPENSSL_DECLARE_ERROR_REASON(ASN1, OBJECT_NOT_ASCII_FORMAT)
100 OPENSSL_DECLARE_ERROR_REASON(ASN1, SEQUENCE_OR_SET_NEEDS_CONFIG)
101 OPENSSL_DECLARE_ERROR_REASON(ASN1, TIME_NOT_ASCII_FORMAT)
102 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_FORMAT)
103 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_TAG)
104 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_TYPE)
105
106 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
107 long max);
108 static void asn1_put_length(unsigned char **pp, int length);
109
ASN1_get_object(const unsigned char ** pp,long * plength,int * ptag,int * pclass,long omax)110 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
111 int *pclass, long omax)
112 {
113 int i, ret;
114 long l;
115 const unsigned char *p = *pp;
116 int tag, xclass, inf;
117 long max = omax;
118
119 if (!max)
120 goto err;
121 ret = (*p & V_ASN1_CONSTRUCTED);
122 xclass = (*p & V_ASN1_PRIVATE);
123 i = *p & V_ASN1_PRIMITIVE_TAG;
124 if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
125 p++;
126 if (--max == 0)
127 goto err;
128 l = 0;
129 while (*p & 0x80) {
130 l <<= 7L;
131 l |= *(p++) & 0x7f;
132 if (--max == 0)
133 goto err;
134 if (l > (INT_MAX >> 7L))
135 goto err;
136 }
137 l <<= 7L;
138 l |= *(p++) & 0x7f;
139 tag = (int)l;
140 if (--max == 0)
141 goto err;
142 } else {
143 tag = i;
144 p++;
145 if (--max == 0)
146 goto err;
147 }
148
149 /* To avoid ambiguity with V_ASN1_NEG, impose a limit on universal tags. */
150 if (xclass == V_ASN1_UNIVERSAL && tag > V_ASN1_MAX_UNIVERSAL)
151 goto err;
152
153 *ptag = tag;
154 *pclass = xclass;
155 if (!asn1_get_length(&p, &inf, plength, max))
156 goto err;
157
158 if (inf && !(ret & V_ASN1_CONSTRUCTED))
159 goto err;
160
161 #if 0
162 fprintf(stderr, "p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n",
163 (int)p, *plength, omax, (int)*pp, (int)(p + *plength),
164 (int)(omax + *pp));
165
166 #endif
167 if (*plength > (omax - (p - *pp))) {
168 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
169 /*
170 * Set this so that even if things are not long enough the values are
171 * set correctly
172 */
173 ret |= 0x80;
174 }
175 *pp = p;
176 return (ret | inf);
177 err:
178 OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
179 return (0x80);
180 }
181
asn1_get_length(const unsigned char ** pp,int * inf,long * rl,long max)182 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
183 long max)
184 {
185 const unsigned char *p = *pp;
186 unsigned long ret = 0;
187 unsigned long i;
188
189 if (max-- < 1)
190 return 0;
191 if (*p == 0x80) {
192 *inf = 1;
193 ret = 0;
194 p++;
195 } else {
196 *inf = 0;
197 i = *p & 0x7f;
198 if (*(p++) & 0x80) {
199 if (i > sizeof(ret) || max < (long)i)
200 return 0;
201 while (i-- > 0) {
202 ret <<= 8L;
203 ret |= *(p++);
204 }
205 } else
206 ret = i;
207 }
208 /*
209 * Bound the length to comfortably fit in an int. Lengths in this module
210 * often switch between int and long without overflow checks.
211 */
212 if (ret > INT_MAX / 2)
213 return 0;
214 *pp = p;
215 *rl = (long)ret;
216 return 1;
217 }
218
219 /*
220 * class 0 is constructed constructed == 2 for indefinite length constructed
221 */
ASN1_put_object(unsigned char ** pp,int constructed,int length,int tag,int xclass)222 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
223 int xclass)
224 {
225 unsigned char *p = *pp;
226 int i, ttag;
227
228 i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
229 i |= (xclass & V_ASN1_PRIVATE);
230 if (tag < 31)
231 *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
232 else {
233 *(p++) = i | V_ASN1_PRIMITIVE_TAG;
234 for (i = 0, ttag = tag; ttag > 0; i++)
235 ttag >>= 7;
236 ttag = i;
237 while (i-- > 0) {
238 p[i] = tag & 0x7f;
239 if (i != (ttag - 1))
240 p[i] |= 0x80;
241 tag >>= 7;
242 }
243 p += ttag;
244 }
245 if (constructed == 2)
246 *(p++) = 0x80;
247 else
248 asn1_put_length(&p, length);
249 *pp = p;
250 }
251
ASN1_put_eoc(unsigned char ** pp)252 int ASN1_put_eoc(unsigned char **pp)
253 {
254 /* This function is no longer used in the library, but some external code
255 * uses it. */
256 unsigned char *p = *pp;
257 *p++ = 0;
258 *p++ = 0;
259 *pp = p;
260 return 2;
261 }
262
asn1_put_length(unsigned char ** pp,int length)263 static void asn1_put_length(unsigned char **pp, int length)
264 {
265 unsigned char *p = *pp;
266 int i, l;
267 if (length <= 127)
268 *(p++) = (unsigned char)length;
269 else {
270 l = length;
271 for (i = 0; l > 0; i++)
272 l >>= 8;
273 *(p++) = i | 0x80;
274 l = i;
275 while (i-- > 0) {
276 p[i] = length & 0xff;
277 length >>= 8;
278 }
279 p += l;
280 }
281 *pp = p;
282 }
283
ASN1_object_size(int constructed,int length,int tag)284 int ASN1_object_size(int constructed, int length, int tag)
285 {
286 int ret = 1;
287 if (length < 0)
288 return -1;
289 if (tag >= 31) {
290 while (tag > 0) {
291 tag >>= 7;
292 ret++;
293 }
294 }
295 if (constructed == 2) {
296 ret += 3;
297 } else {
298 ret++;
299 if (length > 127) {
300 int tmplen = length;
301 while (tmplen > 0) {
302 tmplen >>= 8;
303 ret++;
304 }
305 }
306 }
307 if (ret >= INT_MAX - length)
308 return -1;
309 return ret + length;
310 }
311
ASN1_STRING_copy(ASN1_STRING * dst,const ASN1_STRING * str)312 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
313 {
314 if (str == NULL)
315 return 0;
316 if (!ASN1_STRING_set(dst, str->data, str->length))
317 return 0;
318 dst->type = str->type;
319 dst->flags = str->flags;
320 return 1;
321 }
322
ASN1_STRING_dup(const ASN1_STRING * str)323 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
324 {
325 ASN1_STRING *ret;
326 if (!str)
327 return NULL;
328 ret = ASN1_STRING_new();
329 if (!ret)
330 return NULL;
331 if (!ASN1_STRING_copy(ret, str)) {
332 ASN1_STRING_free(ret);
333 return NULL;
334 }
335 return ret;
336 }
337
ASN1_STRING_set(ASN1_STRING * str,const void * _data,int len)338 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
339 {
340 unsigned char *c;
341 const char *data = _data;
342
343 if (len < 0) {
344 if (data == NULL)
345 return (0);
346 else
347 len = strlen(data);
348 }
349 if ((str->length <= len) || (str->data == NULL)) {
350 c = str->data;
351 if (c == NULL)
352 str->data = OPENSSL_malloc(len + 1);
353 else
354 str->data = OPENSSL_realloc(c, len + 1);
355
356 if (str->data == NULL) {
357 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
358 str->data = c;
359 return (0);
360 }
361 }
362 str->length = len;
363 if (data != NULL) {
364 OPENSSL_memcpy(str->data, data, len);
365 /* an allowance for strings :-) */
366 str->data[len] = '\0';
367 }
368 return (1);
369 }
370
ASN1_STRING_set0(ASN1_STRING * str,void * data,int len)371 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
372 {
373 if (str->data)
374 OPENSSL_free(str->data);
375 str->data = data;
376 str->length = len;
377 }
378
ASN1_STRING_new(void)379 ASN1_STRING *ASN1_STRING_new(void)
380 {
381 return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
382 }
383
ASN1_STRING_type_new(int type)384 ASN1_STRING *ASN1_STRING_type_new(int type)
385 {
386 ASN1_STRING *ret;
387
388 ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
389 if (ret == NULL) {
390 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
391 return (NULL);
392 }
393 ret->length = 0;
394 ret->type = type;
395 ret->data = NULL;
396 ret->flags = 0;
397 return (ret);
398 }
399
ASN1_STRING_free(ASN1_STRING * str)400 void ASN1_STRING_free(ASN1_STRING *str)
401 {
402 if (str == NULL)
403 return;
404 OPENSSL_free(str->data);
405 OPENSSL_free(str);
406 }
407
ASN1_STRING_cmp(const ASN1_STRING * a,const ASN1_STRING * b)408 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
409 {
410 int i;
411
412 i = (a->length - b->length);
413 if (i == 0) {
414 i = OPENSSL_memcmp(a->data, b->data, a->length);
415 if (i == 0)
416 return (a->type - b->type);
417 else
418 return (i);
419 } else
420 return (i);
421 }
422
ASN1_STRING_length(const ASN1_STRING * str)423 int ASN1_STRING_length(const ASN1_STRING *str)
424 {
425 return str->length;
426 }
427
ASN1_STRING_type(const ASN1_STRING * str)428 int ASN1_STRING_type(const ASN1_STRING *str)
429 {
430 return str->type;
431 }
432
ASN1_STRING_data(ASN1_STRING * str)433 unsigned char *ASN1_STRING_data(ASN1_STRING *str)
434 {
435 return str->data;
436 }
437
ASN1_STRING_get0_data(const ASN1_STRING * str)438 const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *str)
439 {
440 return str->data;
441 }
442