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d02b48c6 | 1 | /* crypto/asn1/asn1_lib.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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> | |
f9082268 | 60 | #include <limits.h> |
d02b48c6 | 61 | #include "cryptlib.h" |
ec577822 | 62 | #include <openssl/asn1.h> |
40889b9c | 63 | #include <openssl/asn1_mac.h> |
d02b48c6 | 64 | |
4d6e1e4f BL |
65 | static int asn1_get_length(const unsigned char **pp, int *inf, size_t *rl, |
66 | size_t max); | |
d02b48c6 | 67 | static void asn1_put_length(unsigned char **pp, int length); |
560b79cb | 68 | const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT; |
d02b48c6 | 69 | |
875a644a | 70 | static int _asn1_check_infinite_end(const unsigned char **p, long len) |
d02b48c6 RE |
71 | { |
72 | /* If there is 0 or 1 byte left, the length check should pick | |
73 | * things up */ | |
74 | if (len <= 0) | |
75 | return(1); | |
76 | else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) | |
77 | { | |
78 | (*p)+=2; | |
79 | return(1); | |
80 | } | |
81 | return(0); | |
82 | } | |
83 | ||
4d6e1e4f | 84 | int ASN1_check_infinite_end(unsigned char **p, size_t len) |
875a644a RL |
85 | { |
86 | return _asn1_check_infinite_end((const unsigned char **)p, len); | |
87 | } | |
d02b48c6 | 88 | |
4d6e1e4f | 89 | int ASN1_const_check_infinite_end(const unsigned char **p, size_t len) |
875a644a RL |
90 | { |
91 | return _asn1_check_infinite_end(p, len); | |
92 | } | |
93 | ||
94 | ||
4d6e1e4f BL |
95 | int ASN1_get_object(const unsigned char **pp, size_t *plength, int *ptag, |
96 | int *pclass, size_t omax) | |
d02b48c6 RE |
97 | { |
98 | int i,ret; | |
99 | long l; | |
875a644a | 100 | const unsigned char *p= *pp; |
d02b48c6 | 101 | int tag,xclass,inf; |
4d6e1e4f BL |
102 | size_t max=omax; |
103 | ||
104 | if (!max) | |
105 | goto err; | |
d02b48c6 | 106 | |
d02b48c6 RE |
107 | ret=(*p&V_ASN1_CONSTRUCTED); |
108 | xclass=(*p&V_ASN1_PRIVATE); | |
5d818c30 UM |
109 | i= *p&V_ASN1_PRIMITIVE_TAG; |
110 | if (i == V_ASN1_PRIMITIVE_TAG) | |
d02b48c6 RE |
111 | { /* high-tag */ |
112 | p++; | |
113 | if (--max == 0) goto err; | |
114 | l=0; | |
115 | while (*p&0x80) | |
116 | { | |
117 | l<<=7L; | |
118 | l|= *(p++)&0x7f; | |
119 | if (--max == 0) goto err; | |
29902449 | 120 | if (l > (INT_MAX >> 7L)) goto err; |
d02b48c6 RE |
121 | } |
122 | l<<=7L; | |
123 | l|= *(p++)&0x7f; | |
124 | tag=(int)l; | |
29902449 | 125 | if (--max == 0) goto err; |
d02b48c6 RE |
126 | } |
127 | else | |
128 | { | |
129 | tag=i; | |
130 | p++; | |
131 | if (--max == 0) goto err; | |
132 | } | |
133 | *ptag=tag; | |
134 | *pclass=xclass; | |
135 | if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err; | |
136 | ||
dfeab068 RE |
137 | #if 0 |
138 | fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", | |
139 | (int)p,*plength,omax,(int)*pp,(int)(p+ *plength), | |
140 | (int)(omax+ *pp)); | |
d02b48c6 | 141 | |
58964a49 | 142 | #endif |
aaa384ca | 143 | if (*plength > (omax - (p - *pp))) |
d02b48c6 RE |
144 | { |
145 | ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG); | |
146 | /* Set this so that even if things are not long enough | |
147 | * the values are set correctly */ | |
148 | ret|=0x80; | |
149 | } | |
150 | *pp=p; | |
dfeab068 | 151 | return(ret|inf); |
d02b48c6 RE |
152 | err: |
153 | ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG); | |
154 | return(0x80); | |
155 | } | |
156 | ||
4d6e1e4f BL |
157 | static int asn1_get_length(const unsigned char **pp, int *inf, size_t *rl, |
158 | size_t max) | |
d02b48c6 | 159 | { |
875a644a | 160 | const unsigned char *p= *pp; |
f9082268 | 161 | unsigned long ret=0; |
27545970 | 162 | unsigned int i; |
d02b48c6 RE |
163 | |
164 | if (max-- < 1) return(0); | |
165 | if (*p == 0x80) | |
166 | { | |
167 | *inf=1; | |
168 | ret=0; | |
169 | p++; | |
170 | } | |
171 | else | |
172 | { | |
173 | *inf=0; | |
174 | i= *p&0x7f; | |
175 | if (*(p++) & 0x80) | |
176 | { | |
c046fffa LJ |
177 | if (i > sizeof(long)) |
178 | return 0; | |
d02b48c6 RE |
179 | if (max-- == 0) return(0); |
180 | while (i-- > 0) | |
181 | { | |
182 | ret<<=8L; | |
183 | ret|= *(p++); | |
184 | if (max-- == 0) return(0); | |
185 | } | |
186 | } | |
187 | else | |
188 | ret=i; | |
189 | } | |
f9082268 | 190 | if (ret > LONG_MAX) |
c046fffa | 191 | return 0; |
d02b48c6 | 192 | *pp=p; |
f9082268 | 193 | *rl=(long)ret; |
d02b48c6 RE |
194 | return(1); |
195 | } | |
196 | ||
197 | /* class 0 is constructed | |
657e60fa | 198 | * constructed == 2 for indefinite length constructed */ |
4d6e1e4f BL |
199 | void ASN1_put_object(unsigned char **pp, int constructed, size_t length, |
200 | int tag, int xclass) | |
d02b48c6 RE |
201 | { |
202 | unsigned char *p= *pp; | |
094fe66d | 203 | int i, ttag; |
d02b48c6 RE |
204 | |
205 | i=(constructed)?V_ASN1_CONSTRUCTED:0; | |
206 | i|=(xclass&V_ASN1_PRIVATE); | |
207 | if (tag < 31) | |
5d818c30 | 208 | *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG); |
d02b48c6 RE |
209 | else |
210 | { | |
5d818c30 | 211 | *(p++)=i|V_ASN1_PRIMITIVE_TAG; |
094fe66d DSH |
212 | for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7; |
213 | ttag = i; | |
214 | while(i-- > 0) | |
d02b48c6 | 215 | { |
094fe66d DSH |
216 | p[i] = tag & 0x7f; |
217 | if(i != (ttag - 1)) p[i] |= 0x80; | |
218 | tag >>= 7; | |
d02b48c6 | 219 | } |
094fe66d | 220 | p += ttag; |
d02b48c6 | 221 | } |
230fd6b7 DSH |
222 | if (constructed == 2) |
223 | *(p++)=0x80; | |
d02b48c6 RE |
224 | else |
225 | asn1_put_length(&p,length); | |
226 | *pp=p; | |
227 | } | |
228 | ||
230fd6b7 DSH |
229 | int ASN1_put_eoc(unsigned char **pp) |
230 | { | |
231 | unsigned char *p = *pp; | |
232 | *p++ = 0; | |
233 | *p++ = 0; | |
234 | *pp = p; | |
235 | return 2; | |
236 | } | |
237 | ||
6b691a5c | 238 | static void asn1_put_length(unsigned char **pp, int length) |
d02b48c6 RE |
239 | { |
240 | unsigned char *p= *pp; | |
241 | int i,l; | |
242 | if (length <= 127) | |
243 | *(p++)=(unsigned char)length; | |
244 | else | |
245 | { | |
246 | l=length; | |
247 | for (i=0; l > 0; i++) | |
248 | l>>=8; | |
249 | *(p++)=i|0x80; | |
250 | l=i; | |
251 | while (i-- > 0) | |
252 | { | |
253 | p[i]=length&0xff; | |
254 | length>>=8; | |
255 | } | |
256 | p+=l; | |
257 | } | |
258 | *pp=p; | |
259 | } | |
260 | ||
4d6e1e4f | 261 | size_t ASN1_object_size(int constructed, size_t length, int tag) |
d02b48c6 RE |
262 | { |
263 | int ret; | |
264 | ||
265 | ret=length; | |
266 | ret++; | |
267 | if (tag >= 31) | |
268 | { | |
269 | while (tag > 0) | |
270 | { | |
271 | tag>>=7; | |
272 | ret++; | |
273 | } | |
274 | } | |
230fd6b7 DSH |
275 | if (constructed == 2) |
276 | return ret + 3; | |
d02b48c6 RE |
277 | ret++; |
278 | if (length > 127) | |
279 | { | |
280 | while (length > 0) | |
281 | { | |
282 | length>>=8; | |
283 | ret++; | |
284 | } | |
285 | } | |
286 | return(ret); | |
287 | } | |
288 | ||
875a644a | 289 | static int _asn1_Finish(ASN1_const_CTX *c) |
d02b48c6 RE |
290 | { |
291 | if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) | |
292 | { | |
875a644a | 293 | if (!ASN1_const_check_infinite_end(&c->p,c->slen)) |
d02b48c6 | 294 | { |
dfeab068 | 295 | c->error=ERR_R_MISSING_ASN1_EOS; |
d02b48c6 RE |
296 | return(0); |
297 | } | |
298 | } | |
299 | if ( ((c->slen != 0) && !(c->inf & 1)) || | |
300 | ((c->slen < 0) && (c->inf & 1))) | |
301 | { | |
dfeab068 | 302 | c->error=ERR_R_ASN1_LENGTH_MISMATCH; |
d02b48c6 RE |
303 | return(0); |
304 | } | |
305 | return(1); | |
306 | } | |
307 | ||
875a644a RL |
308 | int asn1_Finish(ASN1_CTX *c) |
309 | { | |
310 | return _asn1_Finish((ASN1_const_CTX *)c); | |
311 | } | |
312 | ||
313 | int asn1_const_Finish(ASN1_const_CTX *c) | |
314 | { | |
315 | return _asn1_Finish(c); | |
316 | } | |
317 | ||
5e4430e7 | 318 | int asn1_GetSequence(ASN1_const_CTX *c, size_t *length) |
d02b48c6 | 319 | { |
875a644a | 320 | const unsigned char *q; |
d02b48c6 RE |
321 | |
322 | q=c->p; | |
323 | c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass), | |
324 | *length); | |
325 | if (c->inf & 0x80) | |
326 | { | |
dfeab068 | 327 | c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL; |
d02b48c6 RE |
328 | return(0); |
329 | } | |
330 | if (c->tag != V_ASN1_SEQUENCE) | |
331 | { | |
dfeab068 | 332 | c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE; |
d02b48c6 RE |
333 | return(0); |
334 | } | |
335 | (*length)-=(c->p-q); | |
336 | if (c->max && (*length < 0)) | |
337 | { | |
dfeab068 | 338 | c->error=ERR_R_ASN1_LENGTH_MISMATCH; |
d02b48c6 RE |
339 | return(0); |
340 | } | |
341 | if (c->inf == (1|V_ASN1_CONSTRUCTED)) | |
342 | c->slen= *length+ *(c->pp)-c->p; | |
343 | c->eos=0; | |
344 | return(1); | |
345 | } | |
346 | ||
18f54773 DSH |
347 | int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str) |
348 | { | |
349 | if (str == NULL) | |
350 | return 0; | |
351 | dst->type = str->type; | |
352 | if (!ASN1_STRING_set(dst,str->data,str->length)) | |
353 | return 0; | |
354 | dst->flags = str->flags; | |
355 | return 1; | |
356 | } | |
357 | ||
6384e46d | 358 | ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str) |
d02b48c6 RE |
359 | { |
360 | ASN1_STRING *ret; | |
18f54773 DSH |
361 | if (!str) |
362 | return NULL; | |
363 | ret=ASN1_STRING_new(); | |
364 | if (!ret) | |
365 | return NULL; | |
366 | if (!ASN1_STRING_copy(ret,str)) | |
d02b48c6 RE |
367 | { |
368 | ASN1_STRING_free(ret); | |
18f54773 | 369 | return NULL; |
d02b48c6 | 370 | } |
18f54773 | 371 | return ret; |
d02b48c6 RE |
372 | } |
373 | ||
4d6e1e4f | 374 | int ASN1_STRING_set(ASN1_STRING *str, const void *_data, size_t len) |
d02b48c6 | 375 | { |
61f5b6f3 BL |
376 | unsigned char *c; |
377 | const char *data=_data; | |
d02b48c6 RE |
378 | |
379 | if (len < 0) | |
380 | { | |
381 | if (data == NULL) | |
382 | return(0); | |
383 | else | |
61f5b6f3 | 384 | len=strlen(data); |
d02b48c6 RE |
385 | } |
386 | if ((str->length < len) || (str->data == NULL)) | |
387 | { | |
61f5b6f3 | 388 | c=str->data; |
d02b48c6 | 389 | if (c == NULL) |
26a3a48d | 390 | str->data=OPENSSL_malloc(len+1); |
d02b48c6 | 391 | else |
26a3a48d | 392 | str->data=OPENSSL_realloc(c,len+1); |
d02b48c6 RE |
393 | |
394 | if (str->data == NULL) | |
395 | { | |
a0e7c8ee | 396 | ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE); |
61f5b6f3 | 397 | str->data=c; |
d02b48c6 RE |
398 | return(0); |
399 | } | |
400 | } | |
401 | str->length=len; | |
402 | if (data != NULL) | |
403 | { | |
404 | memcpy(str->data,data,len); | |
657e60fa | 405 | /* an allowance for strings :-) */ |
d02b48c6 RE |
406 | str->data[len]='\0'; |
407 | } | |
408 | return(1); | |
409 | } | |
410 | ||
4d6e1e4f | 411 | void ASN1_STRING_set0(ASN1_STRING *str, void *data, size_t len) |
399a6f0b DSH |
412 | { |
413 | if (str->data) | |
414 | OPENSSL_free(str->data); | |
415 | str->data = data; | |
416 | str->length = len; | |
417 | } | |
418 | ||
6b691a5c | 419 | ASN1_STRING *ASN1_STRING_new(void) |
d02b48c6 RE |
420 | { |
421 | return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); | |
422 | } | |
423 | ||
424 | ||
6b691a5c | 425 | ASN1_STRING *ASN1_STRING_type_new(int type) |
d02b48c6 RE |
426 | { |
427 | ASN1_STRING *ret; | |
428 | ||
26a3a48d | 429 | ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); |
d02b48c6 RE |
430 | if (ret == NULL) |
431 | { | |
432 | ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE); | |
433 | return(NULL); | |
434 | } | |
435 | ret->length=0; | |
436 | ret->type=type; | |
437 | ret->data=NULL; | |
dfeab068 | 438 | ret->flags=0; |
d02b48c6 RE |
439 | return(ret); |
440 | } | |
441 | ||
6b691a5c | 442 | void ASN1_STRING_free(ASN1_STRING *a) |
d02b48c6 RE |
443 | { |
444 | if (a == NULL) return; | |
9cfc8a9d DSH |
445 | if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF)) |
446 | OPENSSL_free(a->data); | |
26a3a48d | 447 | OPENSSL_free(a); |
d02b48c6 RE |
448 | } |
449 | ||
6384e46d | 450 | int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) |
d02b48c6 RE |
451 | { |
452 | int i; | |
453 | ||
454 | i=(a->length-b->length); | |
455 | if (i == 0) | |
456 | { | |
457 | i=memcmp(a->data,b->data,a->length); | |
458 | if (i == 0) | |
459 | return(a->type-b->type); | |
460 | else | |
461 | return(i); | |
462 | } | |
463 | else | |
464 | return(i); | |
465 | } | |
466 | ||
875a644a | 467 | void asn1_add_error(const unsigned char *address, int offset) |
58964a49 | 468 | { |
c046fffa | 469 | char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1]; |
58964a49 | 470 | |
d420ac2c RL |
471 | BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address); |
472 | BIO_snprintf(buf2,sizeof buf2,"%d",offset); | |
58964a49 RE |
473 | ERR_add_error_data(4,"address=",buf1," offset=",buf2); |
474 | } | |
475 | ||
4d6e1e4f BL |
476 | size_t ASN1_STRING_length(const ASN1_STRING *x) |
477 | { return M_ASN1_STRING_length(x); } | |
08e9c1af | 478 | |
4d6e1e4f BL |
479 | void ASN1_STRING_length_set(ASN1_STRING *x, size_t len) |
480 | { M_ASN1_STRING_length_set(x, len); return; } | |
08e9c1af DSH |
481 | |
482 | int ASN1_STRING_type(ASN1_STRING *x) | |
4d6e1e4f | 483 | { return M_ASN1_STRING_type(x); } |
08e9c1af DSH |
484 | |
485 | unsigned char * ASN1_STRING_data(ASN1_STRING *x) | |
4d6e1e4f | 486 | { return M_ASN1_STRING_data(x); } |