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 /* Used in asn1_mac.h.
68  * TODO(davidben): Remove this once asn1_mac.h is gone or trimmed. */
69 OPENSSL_DECLARE_ERROR_REASON(ASN1, MALLOC_FAILURE);
70 
71 /* Cross-module errors from crypto/x509/i2d_pr.c */
72 OPENSSL_DECLARE_ERROR_FUNCTION(ASN1, i2d_PrivateKey);
73 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_PUBLIC_KEY_TYPE);
74 
75 /* Cross-module errors from crypto/x509/asn1_gen.c.
76  * TODO(davidben): Remove these once asn1_gen.c is gone. */
77 OPENSSL_DECLARE_ERROR_FUNCTION(ASN1, ASN1_generate_v3);
78 OPENSSL_DECLARE_ERROR_FUNCTION(ASN1, asn1_cb);
79 OPENSSL_DECLARE_ERROR_FUNCTION(ASN1, parse_tagging);
80 OPENSSL_DECLARE_ERROR_FUNCTION(ASN1, append_exp);
81 OPENSSL_DECLARE_ERROR_FUNCTION(ASN1, asn1_str2type);
82 OPENSSL_DECLARE_ERROR_FUNCTION(ASN1, bitstr_cb);
83 OPENSSL_DECLARE_ERROR_REASON(ASN1, DEPTH_EXCEEDED);
84 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BITSTRING_FORMAT);
85 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BOOLEAN);
86 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_FORMAT);
87 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_HEX);
88 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_IMPLICIT_TAG);
89 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_INTEGER);
90 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NESTED_TAGGING);
91 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NULL_VALUE);
92 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_OBJECT);
93 OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_TIME_VALUE);
94 OPENSSL_DECLARE_ERROR_REASON(ASN1, INTEGER_NOT_ASCII_FORMAT);
95 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_MODIFIER);
96 OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_NUMBER);
97 OPENSSL_DECLARE_ERROR_REASON(ASN1, LIST_ERROR);
98 OPENSSL_DECLARE_ERROR_REASON(ASN1, MISSING_VALUE);
99 OPENSSL_DECLARE_ERROR_REASON(ASN1, NOT_ASCII_FORMAT);
100 OPENSSL_DECLARE_ERROR_REASON(ASN1, OBJECT_NOT_ASCII_FORMAT);
101 OPENSSL_DECLARE_ERROR_REASON(ASN1, SEQUENCE_OR_SET_NEEDS_CONFIG);
102 OPENSSL_DECLARE_ERROR_REASON(ASN1, TIME_NOT_ASCII_FORMAT);
103 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_FORMAT);
104 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_TAG);
105 OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_TYPE);
106 
107 static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);
108 static void asn1_put_length(unsigned char **pp, int length);
109 
_asn1_check_infinite_end(const unsigned char ** p,long len)110 static int _asn1_check_infinite_end(const unsigned char **p, long len)
111 	{
112 	/* If there is 0 or 1 byte left, the length check should pick
113 	 * things up */
114 	if (len <= 0)
115 		return(1);
116 	else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
117 		{
118 		(*p)+=2;
119 		return(1);
120 		}
121 	return(0);
122 	}
123 
ASN1_check_infinite_end(unsigned char ** p,long len)124 int ASN1_check_infinite_end(unsigned char **p, long len)
125 	{
126 	return _asn1_check_infinite_end((const unsigned char **)p, len);
127 	}
128 
ASN1_const_check_infinite_end(const unsigned char ** p,long len)129 int ASN1_const_check_infinite_end(const unsigned char **p, long len)
130 	{
131 	return _asn1_check_infinite_end(p, len);
132 	}
133 
134 
ASN1_get_object(const unsigned char ** pp,long * plength,int * ptag,int * pclass,long omax)135 int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
136 	int *pclass, long omax)
137 	{
138 	int i,ret;
139 	long l;
140 	const unsigned char *p= *pp;
141 	int tag,xclass,inf;
142 	long max=omax;
143 
144 	if (!max) goto err;
145 	ret=(*p&V_ASN1_CONSTRUCTED);
146 	xclass=(*p&V_ASN1_PRIVATE);
147 	i= *p&V_ASN1_PRIMITIVE_TAG;
148 	if (i == V_ASN1_PRIMITIVE_TAG)
149 		{		/* high-tag */
150 		p++;
151 		if (--max == 0) goto err;
152 		l=0;
153 		while (*p&0x80)
154 			{
155 			l<<=7L;
156 			l|= *(p++)&0x7f;
157 			if (--max == 0) goto err;
158 			if (l > (INT_MAX >> 7L)) goto err;
159 			}
160 		l<<=7L;
161 		l|= *(p++)&0x7f;
162 		tag=(int)l;
163 		if (--max == 0) goto err;
164 		}
165 	else
166 		{
167 		tag=i;
168 		p++;
169 		if (--max == 0) goto err;
170 		}
171 	*ptag=tag;
172 	*pclass=xclass;
173 	if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
174 
175 	if (inf && !(ret & V_ASN1_CONSTRUCTED))
176 		goto err;
177 
178 #if 0
179 	fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n",
180 		(int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
181 		(int)(omax+ *pp));
182 
183 #endif
184 	if (*plength > (omax - (p - *pp)))
185 		{
186 		OPENSSL_PUT_ERROR(ASN1, ASN1_get_object, ASN1_R_TOO_LONG);
187 		/* Set this so that even if things are not long enough
188 		 * the values are set correctly */
189 		ret|=0x80;
190 		}
191 	*pp=p;
192 	return(ret|inf);
193 err:
194 	OPENSSL_PUT_ERROR(ASN1, ASN1_get_object, ASN1_R_HEADER_TOO_LONG);
195 	return(0x80);
196 	}
197 
asn1_get_length(const unsigned char ** pp,int * inf,long * rl,int max)198 static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
199 	{
200 	const unsigned char *p= *pp;
201 	unsigned long ret=0;
202 	unsigned int i;
203 
204 	if (max-- < 1) return(0);
205 	if (*p == 0x80)
206 		{
207 		*inf=1;
208 		ret=0;
209 		p++;
210 		}
211 	else
212 		{
213 		*inf=0;
214 		i= *p&0x7f;
215 		if (*(p++) & 0x80)
216 			{
217 			if (i > sizeof(long))
218 				return 0;
219 			if (max-- == 0) return(0);
220 			while (i-- > 0)
221 				{
222 				ret<<=8L;
223 				ret|= *(p++);
224 				if (max-- == 0) return(0);
225 				}
226 			}
227 		else
228 			ret=i;
229 		}
230 	if (ret > LONG_MAX)
231 		return 0;
232 	*pp=p;
233 	*rl=(long)ret;
234 	return(1);
235 	}
236 
237 /* class 0 is constructed
238  * constructed == 2 for indefinite length constructed */
ASN1_put_object(unsigned char ** pp,int constructed,int length,int tag,int xclass)239 void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
240 	     int xclass)
241 	{
242 	unsigned char *p= *pp;
243 	int i, ttag;
244 
245 	i=(constructed)?V_ASN1_CONSTRUCTED:0;
246 	i|=(xclass&V_ASN1_PRIVATE);
247 	if (tag < 31)
248 		*(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
249 	else
250 		{
251 		*(p++)=i|V_ASN1_PRIMITIVE_TAG;
252 		for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
253 		ttag = i;
254 		while(i-- > 0)
255 			{
256 			p[i] = tag & 0x7f;
257 			if(i != (ttag - 1)) p[i] |= 0x80;
258 			tag >>= 7;
259 			}
260 		p += ttag;
261 		}
262 	if (constructed == 2)
263 		*(p++)=0x80;
264 	else
265 		asn1_put_length(&p,length);
266 	*pp=p;
267 	}
268 
ASN1_put_eoc(unsigned char ** pp)269 int ASN1_put_eoc(unsigned char **pp)
270 	{
271 	unsigned char *p = *pp;
272 	*p++ = 0;
273 	*p++ = 0;
274 	*pp = p;
275 	return 2;
276 	}
277 
asn1_put_length(unsigned char ** pp,int length)278 static void asn1_put_length(unsigned char **pp, int length)
279 	{
280 	unsigned char *p= *pp;
281 	int i,l;
282 	if (length <= 127)
283 		*(p++)=(unsigned char)length;
284 	else
285 		{
286 		l=length;
287 		for (i=0; l > 0; i++)
288 			l>>=8;
289 		*(p++)=i|0x80;
290 		l=i;
291 		while (i-- > 0)
292 			{
293 			p[i]=length&0xff;
294 			length>>=8;
295 			}
296 		p+=l;
297 		}
298 	*pp=p;
299 	}
300 
ASN1_object_size(int constructed,int length,int tag)301 int ASN1_object_size(int constructed, int length, int tag)
302 	{
303 	int ret;
304 
305 	ret=length;
306 	ret++;
307 	if (tag >= 31)
308 		{
309 		while (tag > 0)
310 			{
311 			tag>>=7;
312 			ret++;
313 			}
314 		}
315 	if (constructed == 2)
316 		return ret + 3;
317 	ret++;
318 	if (length > 127)
319 		{
320 		while (length > 0)
321 			{
322 			length>>=8;
323 			ret++;
324 			}
325 		}
326 	return(ret);
327 	}
328 
_asn1_Finish(ASN1_const_CTX * c)329 static int _asn1_Finish(ASN1_const_CTX *c)
330 	{
331 	if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
332 		{
333 		if (!ASN1_const_check_infinite_end(&c->p,c->slen))
334 			{
335 			c->error=ASN1_R_MISSING_ASN1_EOS;
336 			return(0);
337 			}
338 		}
339 	if (	((c->slen != 0) && !(c->inf & 1)) ||
340 		((c->slen < 0) && (c->inf & 1)))
341 		{
342 		c->error=ASN1_R_ASN1_LENGTH_MISMATCH;
343 		return(0);
344 		}
345 	return(1);
346 	}
347 
asn1_Finish(ASN1_CTX * c)348 int asn1_Finish(ASN1_CTX *c)
349 	{
350 	return _asn1_Finish((ASN1_const_CTX *)c);
351 	}
352 
asn1_const_Finish(ASN1_const_CTX * c)353 int asn1_const_Finish(ASN1_const_CTX *c)
354 	{
355 	return _asn1_Finish(c);
356 	}
357 
asn1_GetSequence(ASN1_const_CTX * c,long * length)358 int asn1_GetSequence(ASN1_const_CTX *c, long *length)
359 	{
360 	const unsigned char *q;
361 
362 	q=c->p;
363 	c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
364 		*length);
365 	if (c->inf & 0x80)
366 		{
367 		c->error=ASN1_R_BAD_GET_ASN1_OBJECT_CALL;
368 		return(0);
369 		}
370 	if (c->tag != V_ASN1_SEQUENCE)
371 		{
372 		c->error=ASN1_R_EXPECTING_AN_ASN1_SEQUENCE;
373 		return(0);
374 		}
375 	(*length)-=(c->p-q);
376 	if (c->max && (*length < 0))
377 		{
378 		c->error=ASN1_R_ASN1_LENGTH_MISMATCH;
379 		return(0);
380 		}
381 	if (c->inf == (1|V_ASN1_CONSTRUCTED))
382 		c->slen= *length+ *(c->pp)-c->p;
383 	c->eos=0;
384 	return(1);
385 	}
386 
ASN1_STRING_copy(ASN1_STRING * dst,const ASN1_STRING * str)387 int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
388 	{
389 	if (str == NULL)
390 		return 0;
391 	dst->type = str->type;
392 	if (!ASN1_STRING_set(dst,str->data,str->length))
393 		return 0;
394 	dst->flags = str->flags;
395 	return 1;
396 	}
397 
ASN1_STRING_dup(const ASN1_STRING * str)398 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
399 	{
400 	ASN1_STRING *ret;
401 	if (!str)
402 		 return NULL;
403 	ret=ASN1_STRING_new();
404 	if (!ret)
405 		return NULL;
406 	if (!ASN1_STRING_copy(ret,str))
407 		{
408 		ASN1_STRING_free(ret);
409 		return NULL;
410 		}
411 	return ret;
412 	}
413 
ASN1_STRING_set(ASN1_STRING * str,const void * _data,int len)414 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
415 	{
416 	unsigned char *c;
417 	const char *data=_data;
418 
419 	if (len < 0)
420 		{
421 		if (data == NULL)
422 			return(0);
423 		else
424 			len=strlen(data);
425 		}
426 	if ((str->length < len) || (str->data == NULL))
427 		{
428 		c=str->data;
429 		if (c == NULL)
430 			str->data=OPENSSL_malloc(len+1);
431 		else
432 			str->data=OPENSSL_realloc(c,len+1);
433 
434 		if (str->data == NULL)
435 			{
436 			OPENSSL_PUT_ERROR(ASN1, ASN1_STRING_set, ERR_R_MALLOC_FAILURE);
437 			str->data=c;
438 			return(0);
439 			}
440 		}
441 	str->length=len;
442 	if (data != NULL)
443 		{
444 		memcpy(str->data,data,len);
445 		/* an allowance for strings :-) */
446 		str->data[len]='\0';
447 		}
448 	return(1);
449 	}
450 
ASN1_STRING_set0(ASN1_STRING * str,void * data,int len)451 void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
452 	{
453 	if (str->data)
454 		OPENSSL_free(str->data);
455 	str->data = data;
456 	str->length = len;
457 	}
458 
ASN1_STRING_new(void)459 ASN1_STRING *ASN1_STRING_new(void)
460 	{
461 	return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
462 	}
463 
464 
ASN1_STRING_type_new(int type)465 ASN1_STRING *ASN1_STRING_type_new(int type)
466 	{
467 	ASN1_STRING *ret;
468 
469 	ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
470 	if (ret == NULL)
471 		{
472 		OPENSSL_PUT_ERROR(ASN1, ASN1_STRING_type_new, ERR_R_MALLOC_FAILURE);
473 		return(NULL);
474 		}
475 	ret->length=0;
476 	ret->type=type;
477 	ret->data=NULL;
478 	ret->flags=0;
479 	return(ret);
480 	}
481 
ASN1_STRING_free(ASN1_STRING * a)482 void ASN1_STRING_free(ASN1_STRING *a)
483 	{
484 	if (a == NULL) return;
485 	if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
486 		OPENSSL_free(a->data);
487 	OPENSSL_free(a);
488 	}
489 
ASN1_STRING_cmp(const ASN1_STRING * a,const ASN1_STRING * b)490 int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
491 	{
492 	int i;
493 
494 	i=(a->length-b->length);
495 	if (i == 0)
496 		{
497 		i=memcmp(a->data,b->data,a->length);
498 		if (i == 0)
499 			return(a->type-b->type);
500 		else
501 			return(i);
502 		}
503 	else
504 		return(i);
505 	}
506 
ASN1_STRING_length(const ASN1_STRING * x)507 int ASN1_STRING_length(const ASN1_STRING *x)
508 { return M_ASN1_STRING_length(x); }
509 
ASN1_STRING_length_set(ASN1_STRING * x,int len)510 void ASN1_STRING_length_set(ASN1_STRING *x, int len)
511 { M_ASN1_STRING_length_set(x, len); return; }
512 
ASN1_STRING_type(ASN1_STRING * x)513 int ASN1_STRING_type(ASN1_STRING *x)
514 { return M_ASN1_STRING_type(x); }
515 
ASN1_STRING_data(ASN1_STRING * x)516 unsigned char * ASN1_STRING_data(ASN1_STRING *x)
517 { return M_ASN1_STRING_data(x); }
518