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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 | |
875a644a | 65 | static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max); |
d02b48c6 | 66 | static void asn1_put_length(unsigned char **pp, int length); |
e778802f | 67 | const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT; |
d02b48c6 | 68 | |
875a644a | 69 | static int _asn1_check_infinite_end(const unsigned char **p, long len) |
d02b48c6 RE |
70 | { |
71 | /* If there is 0 or 1 byte left, the length check should pick | |
72 | * things up */ | |
73 | if (len <= 0) | |
74 | return(1); | |
75 | else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) | |
76 | { | |
77 | (*p)+=2; | |
78 | return(1); | |
79 | } | |
80 | return(0); | |
81 | } | |
82 | ||
875a644a RL |
83 | int ASN1_check_infinite_end(unsigned char **p, long len) |
84 | { | |
85 | return _asn1_check_infinite_end((const unsigned char **)p, len); | |
86 | } | |
d02b48c6 | 87 | |
875a644a RL |
88 | int ASN1_const_check_infinite_end(const unsigned char **p, long len) |
89 | { | |
90 | return _asn1_check_infinite_end(p, len); | |
91 | } | |
92 | ||
93 | ||
94 | int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag, | |
95 | int *pclass, long omax) | |
d02b48c6 RE |
96 | { |
97 | int i,ret; | |
98 | long l; | |
875a644a | 99 | const unsigned char *p= *pp; |
d02b48c6 RE |
100 | int tag,xclass,inf; |
101 | long max=omax; | |
102 | ||
103 | if (!max) goto err; | |
104 | ret=(*p&V_ASN1_CONSTRUCTED); | |
105 | xclass=(*p&V_ASN1_PRIVATE); | |
5d818c30 UM |
106 | i= *p&V_ASN1_PRIMITIVE_TAG; |
107 | if (i == V_ASN1_PRIMITIVE_TAG) | |
d02b48c6 RE |
108 | { /* high-tag */ |
109 | p++; | |
110 | if (--max == 0) goto err; | |
111 | l=0; | |
112 | while (*p&0x80) | |
113 | { | |
114 | l<<=7L; | |
115 | l|= *(p++)&0x7f; | |
116 | if (--max == 0) goto err; | |
29902449 | 117 | if (l > (INT_MAX >> 7L)) goto err; |
d02b48c6 RE |
118 | } |
119 | l<<=7L; | |
120 | l|= *(p++)&0x7f; | |
121 | tag=(int)l; | |
29902449 | 122 | if (--max == 0) goto err; |
d02b48c6 RE |
123 | } |
124 | else | |
125 | { | |
126 | tag=i; | |
127 | p++; | |
128 | if (--max == 0) goto err; | |
129 | } | |
130 | *ptag=tag; | |
131 | *pclass=xclass; | |
132 | if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err; | |
133 | ||
dfeab068 RE |
134 | #if 0 |
135 | fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n", | |
136 | (int)p,*plength,omax,(int)*pp,(int)(p+ *plength), | |
137 | (int)(omax+ *pp)); | |
d02b48c6 | 138 | |
58964a49 | 139 | #endif |
aaa384ca | 140 | if (*plength > (omax - (p - *pp))) |
d02b48c6 RE |
141 | { |
142 | ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG); | |
143 | /* Set this so that even if things are not long enough | |
144 | * the values are set correctly */ | |
145 | ret|=0x80; | |
146 | } | |
147 | *pp=p; | |
dfeab068 | 148 | return(ret|inf); |
d02b48c6 RE |
149 | err: |
150 | ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG); | |
151 | return(0x80); | |
152 | } | |
153 | ||
875a644a | 154 | static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max) |
d02b48c6 | 155 | { |
875a644a | 156 | const unsigned char *p= *pp; |
f9082268 | 157 | unsigned long ret=0; |
27545970 | 158 | unsigned int i; |
d02b48c6 RE |
159 | |
160 | if (max-- < 1) return(0); | |
161 | if (*p == 0x80) | |
162 | { | |
163 | *inf=1; | |
164 | ret=0; | |
165 | p++; | |
166 | } | |
167 | else | |
168 | { | |
169 | *inf=0; | |
170 | i= *p&0x7f; | |
171 | if (*(p++) & 0x80) | |
172 | { | |
c046fffa LJ |
173 | if (i > sizeof(long)) |
174 | return 0; | |
d02b48c6 RE |
175 | if (max-- == 0) return(0); |
176 | while (i-- > 0) | |
177 | { | |
178 | ret<<=8L; | |
179 | ret|= *(p++); | |
180 | if (max-- == 0) return(0); | |
181 | } | |
182 | } | |
183 | else | |
184 | ret=i; | |
185 | } | |
f9082268 | 186 | if (ret > LONG_MAX) |
c046fffa | 187 | return 0; |
d02b48c6 | 188 | *pp=p; |
f9082268 | 189 | *rl=(long)ret; |
d02b48c6 RE |
190 | return(1); |
191 | } | |
192 | ||
193 | /* class 0 is constructed | |
657e60fa | 194 | * constructed == 2 for indefinite length constructed */ |
6b691a5c UM |
195 | void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag, |
196 | int xclass) | |
d02b48c6 RE |
197 | { |
198 | unsigned char *p= *pp; | |
094fe66d | 199 | int i, ttag; |
d02b48c6 RE |
200 | |
201 | i=(constructed)?V_ASN1_CONSTRUCTED:0; | |
202 | i|=(xclass&V_ASN1_PRIVATE); | |
203 | if (tag < 31) | |
5d818c30 | 204 | *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG); |
d02b48c6 RE |
205 | else |
206 | { | |
5d818c30 | 207 | *(p++)=i|V_ASN1_PRIMITIVE_TAG; |
094fe66d DSH |
208 | for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7; |
209 | ttag = i; | |
210 | while(i-- > 0) | |
d02b48c6 | 211 | { |
094fe66d DSH |
212 | p[i] = tag & 0x7f; |
213 | if(i != (ttag - 1)) p[i] |= 0x80; | |
214 | tag >>= 7; | |
d02b48c6 | 215 | } |
094fe66d | 216 | p += ttag; |
d02b48c6 | 217 | } |
230fd6b7 DSH |
218 | if (constructed == 2) |
219 | *(p++)=0x80; | |
d02b48c6 RE |
220 | else |
221 | asn1_put_length(&p,length); | |
222 | *pp=p; | |
223 | } | |
224 | ||
230fd6b7 DSH |
225 | int ASN1_put_eoc(unsigned char **pp) |
226 | { | |
227 | unsigned char *p = *pp; | |
228 | *p++ = 0; | |
229 | *p++ = 0; | |
230 | *pp = p; | |
231 | return 2; | |
232 | } | |
233 | ||
6b691a5c | 234 | static void asn1_put_length(unsigned char **pp, int length) |
d02b48c6 RE |
235 | { |
236 | unsigned char *p= *pp; | |
237 | int i,l; | |
238 | if (length <= 127) | |
239 | *(p++)=(unsigned char)length; | |
240 | else | |
241 | { | |
242 | l=length; | |
243 | for (i=0; l > 0; i++) | |
244 | l>>=8; | |
245 | *(p++)=i|0x80; | |
246 | l=i; | |
247 | while (i-- > 0) | |
248 | { | |
249 | p[i]=length&0xff; | |
250 | length>>=8; | |
251 | } | |
252 | p+=l; | |
253 | } | |
254 | *pp=p; | |
255 | } | |
256 | ||
6b691a5c | 257 | int ASN1_object_size(int constructed, int length, int tag) |
d02b48c6 RE |
258 | { |
259 | int ret; | |
260 | ||
261 | ret=length; | |
262 | ret++; | |
263 | if (tag >= 31) | |
264 | { | |
265 | while (tag > 0) | |
266 | { | |
267 | tag>>=7; | |
268 | ret++; | |
269 | } | |
270 | } | |
230fd6b7 DSH |
271 | if (constructed == 2) |
272 | return ret + 3; | |
d02b48c6 RE |
273 | ret++; |
274 | if (length > 127) | |
275 | { | |
276 | while (length > 0) | |
277 | { | |
278 | length>>=8; | |
279 | ret++; | |
280 | } | |
281 | } | |
282 | return(ret); | |
283 | } | |
284 | ||
875a644a | 285 | static int _asn1_Finish(ASN1_const_CTX *c) |
d02b48c6 RE |
286 | { |
287 | if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos)) | |
288 | { | |
875a644a | 289 | if (!ASN1_const_check_infinite_end(&c->p,c->slen)) |
d02b48c6 | 290 | { |
dfeab068 | 291 | c->error=ERR_R_MISSING_ASN1_EOS; |
d02b48c6 RE |
292 | return(0); |
293 | } | |
294 | } | |
295 | if ( ((c->slen != 0) && !(c->inf & 1)) || | |
296 | ((c->slen < 0) && (c->inf & 1))) | |
297 | { | |
dfeab068 | 298 | c->error=ERR_R_ASN1_LENGTH_MISMATCH; |
d02b48c6 RE |
299 | return(0); |
300 | } | |
301 | return(1); | |
302 | } | |
303 | ||
875a644a RL |
304 | int asn1_Finish(ASN1_CTX *c) |
305 | { | |
306 | return _asn1_Finish((ASN1_const_CTX *)c); | |
307 | } | |
308 | ||
309 | int asn1_const_Finish(ASN1_const_CTX *c) | |
310 | { | |
311 | return _asn1_Finish(c); | |
312 | } | |
313 | ||
314 | int asn1_GetSequence(ASN1_const_CTX *c, long *length) | |
d02b48c6 | 315 | { |
875a644a | 316 | const unsigned char *q; |
d02b48c6 RE |
317 | |
318 | q=c->p; | |
319 | c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass), | |
320 | *length); | |
321 | if (c->inf & 0x80) | |
322 | { | |
dfeab068 | 323 | c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL; |
d02b48c6 RE |
324 | return(0); |
325 | } | |
326 | if (c->tag != V_ASN1_SEQUENCE) | |
327 | { | |
dfeab068 | 328 | c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE; |
d02b48c6 RE |
329 | return(0); |
330 | } | |
331 | (*length)-=(c->p-q); | |
332 | if (c->max && (*length < 0)) | |
333 | { | |
dfeab068 | 334 | c->error=ERR_R_ASN1_LENGTH_MISMATCH; |
d02b48c6 RE |
335 | return(0); |
336 | } | |
337 | if (c->inf == (1|V_ASN1_CONSTRUCTED)) | |
338 | c->slen= *length+ *(c->pp)-c->p; | |
339 | c->eos=0; | |
340 | return(1); | |
341 | } | |
342 | ||
6384e46d | 343 | ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str) |
d02b48c6 RE |
344 | { |
345 | ASN1_STRING *ret; | |
346 | ||
347 | if (str == NULL) return(NULL); | |
348 | if ((ret=ASN1_STRING_type_new(str->type)) == NULL) | |
349 | return(NULL); | |
350 | if (!ASN1_STRING_set(ret,str->data,str->length)) | |
351 | { | |
352 | ASN1_STRING_free(ret); | |
353 | return(NULL); | |
354 | } | |
0ab8beb4 | 355 | ret->flags = str->flags; |
d02b48c6 RE |
356 | return(ret); |
357 | } | |
358 | ||
61f5b6f3 | 359 | int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len) |
d02b48c6 | 360 | { |
61f5b6f3 BL |
361 | unsigned char *c; |
362 | const char *data=_data; | |
d02b48c6 RE |
363 | |
364 | if (len < 0) | |
365 | { | |
366 | if (data == NULL) | |
367 | return(0); | |
368 | else | |
61f5b6f3 | 369 | len=strlen(data); |
d02b48c6 RE |
370 | } |
371 | if ((str->length < len) || (str->data == NULL)) | |
372 | { | |
61f5b6f3 | 373 | c=str->data; |
d02b48c6 | 374 | if (c == NULL) |
26a3a48d | 375 | str->data=OPENSSL_malloc(len+1); |
d02b48c6 | 376 | else |
26a3a48d | 377 | str->data=OPENSSL_realloc(c,len+1); |
d02b48c6 RE |
378 | |
379 | if (str->data == NULL) | |
380 | { | |
a0e7c8ee | 381 | ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE); |
61f5b6f3 | 382 | str->data=c; |
d02b48c6 RE |
383 | return(0); |
384 | } | |
385 | } | |
386 | str->length=len; | |
387 | if (data != NULL) | |
388 | { | |
389 | memcpy(str->data,data,len); | |
657e60fa | 390 | /* an allowance for strings :-) */ |
d02b48c6 RE |
391 | str->data[len]='\0'; |
392 | } | |
393 | return(1); | |
394 | } | |
395 | ||
6b691a5c | 396 | ASN1_STRING *ASN1_STRING_new(void) |
d02b48c6 RE |
397 | { |
398 | return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING)); | |
399 | } | |
400 | ||
401 | ||
6b691a5c | 402 | ASN1_STRING *ASN1_STRING_type_new(int type) |
d02b48c6 RE |
403 | { |
404 | ASN1_STRING *ret; | |
405 | ||
26a3a48d | 406 | ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING)); |
d02b48c6 RE |
407 | if (ret == NULL) |
408 | { | |
409 | ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE); | |
410 | return(NULL); | |
411 | } | |
412 | ret->length=0; | |
413 | ret->type=type; | |
414 | ret->data=NULL; | |
dfeab068 | 415 | ret->flags=0; |
d02b48c6 RE |
416 | return(ret); |
417 | } | |
418 | ||
6b691a5c | 419 | void ASN1_STRING_free(ASN1_STRING *a) |
d02b48c6 RE |
420 | { |
421 | if (a == NULL) return; | |
26a3a48d RL |
422 | if (a->data != NULL) OPENSSL_free(a->data); |
423 | OPENSSL_free(a); | |
d02b48c6 RE |
424 | } |
425 | ||
6384e46d | 426 | int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b) |
d02b48c6 RE |
427 | { |
428 | int i; | |
429 | ||
430 | i=(a->length-b->length); | |
431 | if (i == 0) | |
432 | { | |
433 | i=memcmp(a->data,b->data,a->length); | |
434 | if (i == 0) | |
435 | return(a->type-b->type); | |
436 | else | |
437 | return(i); | |
438 | } | |
439 | else | |
440 | return(i); | |
441 | } | |
442 | ||
875a644a | 443 | void asn1_add_error(const unsigned char *address, int offset) |
58964a49 | 444 | { |
c046fffa | 445 | char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1]; |
58964a49 | 446 | |
d420ac2c RL |
447 | BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address); |
448 | BIO_snprintf(buf2,sizeof buf2,"%d",offset); | |
58964a49 RE |
449 | ERR_add_error_data(4,"address=",buf1," offset=",buf2); |
450 | } | |
451 | ||
6384e46d | 452 | int ASN1_STRING_length(const ASN1_STRING *x) |
08e9c1af DSH |
453 | { return M_ASN1_STRING_length(x); } |
454 | ||
455 | void ASN1_STRING_length_set(ASN1_STRING *x, int len) | |
456 | { M_ASN1_STRING_length_set(x, len); return; } | |
457 | ||
458 | int ASN1_STRING_type(ASN1_STRING *x) | |
459 | { return M_ASN1_STRING_type(x); } | |
460 | ||
461 | unsigned char * ASN1_STRING_data(ASN1_STRING *x) | |
a3fe382e | 462 | { return M_ASN1_STRING_data(x); } |