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
67 /* Cross-module errors from crypto/x509/i2d_pr.c */
68 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_PUBLIC_KEY_TYPE);
69
70 /* Cross-module errors from crypto/x509/asn1_gen.c.
71 * TODO(davidben): Remove these once asn1_gen.c is gone. */
72 OPENSSL_DECLARE_ERROR_REASON(ASN1, DEPTH_EXCEEDED);
73 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BITSTRING_FORMAT);
74 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BOOLEAN);
75 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_FORMAT);
76 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_HEX);
77 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_IMPLICIT_TAG);
78 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_INTEGER);
79 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NESTED_TAGGING);
80 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NULL_VALUE);
81 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_OBJECT);
82 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_TIME_VALUE);
83 OPENSSL_DECLARE_ERROR_REASON(ASN1, INTEGER_NOT_ASCII_FORMAT);
84 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_MODIFIER);
85 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_NUMBER);
86 OPENSSL_DECLARE_ERROR_REASON(ASN1, LIST_ERROR);
87 OPENSSL_DECLARE_ERROR_REASON(ASN1, MISSING_VALUE);
88 OPENSSL_DECLARE_ERROR_REASON(ASN1, NOT_ASCII_FORMAT);
89 OPENSSL_DECLARE_ERROR_REASON(ASN1, OBJECT_NOT_ASCII_FORMAT);
90 OPENSSL_DECLARE_ERROR_REASON(ASN1, SEQUENCE_OR_SET_NEEDS_CONFIG);
91 OPENSSL_DECLARE_ERROR_REASON(ASN1, TIME_NOT_ASCII_FORMAT);
92 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_FORMAT);
93 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_TAG);
94 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_TYPE);
95
96 static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);
97 static void asn1_put_length(unsigned char **pp, int length);
98
_asn1_check_infinite_end(const unsigned char ** p,long len)99 static int _asn1_check_infinite_end(const unsigned char **p, long len)
100 {
101 /* If there is 0 or 1 byte left, the length check should pick
102 * things up */
103 if (len <= 0)
104 return(1);
105 else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
106 {
107 (*p)+=2;
108 return(1);
109 }
110 return(0);
111 }
112
ASN1_check_infinite_end(unsigned char ** p,long len)113 int ASN1_check_infinite_end(unsigned char **p, long len)
114 {
115 return _asn1_check_infinite_end((const unsigned char **)p, len);
116 }
117
ASN1_const_check_infinite_end(const unsigned char ** p,long len)118 int ASN1_const_check_infinite_end(const unsigned char **p, long len)
119 {
120 return _asn1_check_infinite_end(p, len);
121 }
122
123
ASN1_get_object(const unsigned char ** pp,long * plength,int * ptag,int * pclass,long omax)124 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
125 int *pclass, long omax)
126 {
127 int i,ret;
128 long l;
129 const unsigned char *p= *pp;
130 int tag,xclass,inf;
131 long max=omax;
132
133 if (!max) goto err;
134 ret=(*p&V_ASN1_CONSTRUCTED);
135 xclass=(*p&V_ASN1_PRIVATE);
136 i= *p&V_ASN1_PRIMITIVE_TAG;
137 if (i == V_ASN1_PRIMITIVE_TAG)
138 { /* high-tag */
139 p++;
140 if (--max == 0) goto err;
141 l=0;
142 while (*p&0x80)
143 {
144 l<<=7L;
145 l|= *(p++)&0x7f;
146 if (--max == 0) goto err;
147 if (l > (INT_MAX >> 7L)) goto err;
148 }
149 l<<=7L;
150 l|= *(p++)&0x7f;
151 tag=(int)l;
152 if (--max == 0) goto err;
153 }
154 else
155 {
156 tag=i;
157 p++;
158 if (--max == 0) goto err;
159 }
160 *ptag=tag;
161 *pclass=xclass;
162 if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
163
164 if (inf && !(ret & V_ASN1_CONSTRUCTED))
165 goto err;
166
167 #if 0
168 fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n",
169 (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
170 (int)(omax+ *pp));
171
172 #endif
173 if (*plength > (omax - (p - *pp)))
174 {
175 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
176 /* Set this so that even if things are not long enough
177 * the values are set correctly */
178 ret|=0x80;
179 }
180 *pp=p;
181 return(ret|inf);
182 err:
183 OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
184 return(0x80);
185 }
186
asn1_get_length(const unsigned char ** pp,int * inf,long * rl,int max)187 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
188 {
189 const unsigned char *p= *pp;
190 unsigned long ret=0;
191 unsigned int i;
192
193 if (max-- < 1) return(0);
194 if (*p == 0x80)
195 {
196 *inf=1;
197 ret=0;
198 p++;
199 }
200 else
201 {
202 *inf=0;
203 i= *p&0x7f;
204 if (*(p++) & 0x80)
205 {
206 if (i > sizeof(long))
207 return 0;
208 if (max-- == 0) return(0);
209 while (i-- > 0)
210 {
211 ret<<=8L;
212 ret|= *(p++);
213 if (max-- == 0) return(0);
214 }
215 }
216 else
217 ret=i;
218 }
219 if (ret > LONG_MAX)
220 return 0;
221 *pp=p;
222 *rl=(long)ret;
223 return(1);
224 }
225
226 /* class 0 is constructed
227 * constructed == 2 for indefinite length constructed */
ASN1_put_object(unsigned char ** pp,int constructed,int length,int tag,int xclass)228 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
229 int xclass)
230 {
231 unsigned char *p= *pp;
232 int i, ttag;
233
234 i=(constructed)?V_ASN1_CONSTRUCTED:0;
235 i|=(xclass&V_ASN1_PRIVATE);
236 if (tag < 31)
237 *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
238 else
239 {
240 *(p++)=i|V_ASN1_PRIMITIVE_TAG;
241 for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
242 ttag = i;
243 while(i-- > 0)
244 {
245 p[i] = tag & 0x7f;
246 if(i != (ttag - 1)) p[i] |= 0x80;
247 tag >>= 7;
248 }
249 p += ttag;
250 }
251 if (constructed == 2)
252 *(p++)=0x80;
253 else
254 asn1_put_length(&p,length);
255 *pp=p;
256 }
257
ASN1_put_eoc(unsigned char ** pp)258 int ASN1_put_eoc(unsigned char **pp)
259 {
260 unsigned char *p = *pp;
261 *p++ = 0;
262 *p++ = 0;
263 *pp = p;
264 return 2;
265 }
266
asn1_put_length(unsigned char ** pp,int length)267 static void asn1_put_length(unsigned char **pp, int length)
268 {
269 unsigned char *p= *pp;
270 int i,l;
271 if (length <= 127)
272 *(p++)=(unsigned char)length;
273 else
274 {
275 l=length;
276 for (i=0; l > 0; i++)
277 l>>=8;
278 *(p++)=i|0x80;
279 l=i;
280 while (i-- > 0)
281 {
282 p[i]=length&0xff;
283 length>>=8;
284 }
285 p+=l;
286 }
287 *pp=p;
288 }
289
ASN1_object_size(int constructed,int length,int tag)290 int ASN1_object_size(int constructed, int length, int tag)
291 {
292 int ret;
293
294 ret=length;
295 ret++;
296 if (tag >= 31)
297 {
298 while (tag > 0)
299 {
300 tag>>=7;
301 ret++;
302 }
303 }
304 if (constructed == 2)
305 return ret + 3;
306 ret++;
307 if (length > 127)
308 {
309 while (length > 0)
310 {
311 length>>=8;
312 ret++;
313 }
314 }
315 return(ret);
316 }
317
_asn1_Finish(ASN1_const_CTX * c)318 static int _asn1_Finish(ASN1_const_CTX *c)
319 {
320 if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
321 {
322 if (!ASN1_const_check_infinite_end(&c->p,c->slen))
323 {
324 c->error=ASN1_R_MISSING_ASN1_EOS;
325 return(0);
326 }
327 }
328 if ( ((c->slen != 0) && !(c->inf & 1)) ||
329 ((c->slen < 0) && (c->inf & 1)))
330 {
331 c->error=ASN1_R_ASN1_LENGTH_MISMATCH;
332 return(0);
333 }
334 return(1);
335 }
336
asn1_Finish(ASN1_CTX * c)337 int asn1_Finish(ASN1_CTX *c)
338 {
339 return _asn1_Finish((ASN1_const_CTX *)c);
340 }
341
asn1_const_Finish(ASN1_const_CTX * c)342 int asn1_const_Finish(ASN1_const_CTX *c)
343 {
344 return _asn1_Finish(c);
345 }
346
asn1_GetSequence(ASN1_const_CTX * c,long * length)347 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
348 {
349 const unsigned char *q;
350
351 q=c->p;
352 c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
353 *length);
354 if (c->inf & 0x80)
355 {
356 c->error=ASN1_R_BAD_GET_ASN1_OBJECT_CALL;
357 return(0);
358 }
359 if (c->tag != V_ASN1_SEQUENCE)
360 {
361 c->error=ASN1_R_EXPECTING_AN_ASN1_SEQUENCE;
362 return(0);
363 }
364 (*length)-=(c->p-q);
365 if (c->max && (*length < 0))
366 {
367 c->error=ASN1_R_ASN1_LENGTH_MISMATCH;
368 return(0);
369 }
370 if (c->inf == (1|V_ASN1_CONSTRUCTED))
371 c->slen= *length+ *(c->pp)-c->p;
372 c->eos=0;
373 return(1);
374 }
375
ASN1_STRING_copy(ASN1_STRING * dst,const ASN1_STRING * str)376 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
377 {
378 if (str == NULL)
379 return 0;
380 dst->type = str->type;
381 if (!ASN1_STRING_set(dst,str->data,str->length))
382 return 0;
383 dst->flags = str->flags;
384 return 1;
385 }
386
ASN1_STRING_dup(const ASN1_STRING * str)387 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
388 {
389 ASN1_STRING *ret;
390 if (!str)
391 return NULL;
392 ret=ASN1_STRING_new();
393 if (!ret)
394 return NULL;
395 if (!ASN1_STRING_copy(ret,str))
396 {
397 ASN1_STRING_free(ret);
398 return NULL;
399 }
400 return ret;
401 }
402
ASN1_STRING_set(ASN1_STRING * str,const void * _data,int len)403 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
404 {
405 unsigned char *c;
406 const char *data=_data;
407
408 if (len < 0)
409 {
410 if (data == NULL)
411 return(0);
412 else
413 len=strlen(data);
414 }
415 if ((str->length < len) || (str->data == NULL))
416 {
417 c=str->data;
418 if (c == NULL)
419 str->data=OPENSSL_malloc(len+1);
420 else
421 str->data=OPENSSL_realloc(c,len+1);
422
423 if (str->data == NULL)
424 {
425 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
426 str->data=c;
427 return(0);
428 }
429 }
430 str->length=len;
431 if (data != NULL)
432 {
433 memcpy(str->data,data,len);
434 /* an allowance for strings :-) */
435 str->data[len]='\0';
436 }
437 return(1);
438 }
439
ASN1_STRING_set0(ASN1_STRING * str,void * data,int len)440 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
441 {
442 if (str->data)
443 OPENSSL_free(str->data);
444 str->data = data;
445 str->length = len;
446 }
447
ASN1_STRING_new(void)448 ASN1_STRING *ASN1_STRING_new(void)
449 {
450 return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
451 }
452
453
ASN1_STRING_type_new(int type)454 ASN1_STRING *ASN1_STRING_type_new(int type)
455 {
456 ASN1_STRING *ret;
457
458 ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
459 if (ret == NULL)
460 {
461 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
462 return(NULL);
463 }
464 ret->length=0;
465 ret->type=type;
466 ret->data=NULL;
467 ret->flags=0;
468 return(ret);
469 }
470
ASN1_STRING_free(ASN1_STRING * a)471 void ASN1_STRING_free(ASN1_STRING *a)
472 {
473 if (a == NULL) return;
474 if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
475 OPENSSL_free(a->data);
476 OPENSSL_free(a);
477 }
478
ASN1_STRING_cmp(const ASN1_STRING * a,const ASN1_STRING * b)479 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
480 {
481 int i;
482
483 i=(a->length-b->length);
484 if (i == 0)
485 {
486 i=memcmp(a->data,b->data,a->length);
487 if (i == 0)
488 return(a->type-b->type);
489 else
490 return(i);
491 }
492 else
493 return(i);
494 }
495
ASN1_STRING_length(const ASN1_STRING * x)496 int ASN1_STRING_length(const ASN1_STRING *x)
497 { return M_ASN1_STRING_length(x); }
498
ASN1_STRING_length_set(ASN1_STRING * x,int len)499 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
500 { M_ASN1_STRING_length_set(x, len); return; }
501
ASN1_STRING_type(ASN1_STRING * x)502 int ASN1_STRING_type(ASN1_STRING *x)
503 { return M_ASN1_STRING_type(x); }
504
ASN1_STRING_data(ASN1_STRING * x)505 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
506 { return M_ASN1_STRING_data(x); }
507