asn1_lib.c revision 279265 
1/* crypto/asn1/asn1_lib.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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>
60#include <limits.h>
61#include "cryptlib.h"
62#include <openssl/asn1.h>
63#include <openssl/asn1_mac.h>
64
65static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);
66static void asn1_put_length(unsigned char **pp, int length);
67const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT;
68
69static int _asn1_check_infinite_end(const unsigned char **p, long len)
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
83int ASN1_check_infinite_end(unsigned char **p, long len)
84	{
85	return _asn1_check_infinite_end((const unsigned char **)p, len);
86	}
87
88int ASN1_const_check_infinite_end(const unsigned char **p, long len)
89	{
90	return _asn1_check_infinite_end(p, len);
91	}
92
93
94int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
95	int *pclass, long omax)
96	{
97	int i,ret;
98	long l;
99	const unsigned char *p= *pp;
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);
106	i= *p&V_ASN1_PRIMITIVE_TAG;
107	if (i == V_ASN1_PRIMITIVE_TAG)
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;
117			if (l > (INT_MAX >> 7L)) goto err;
118			}
119		l<<=7L;
120		l|= *(p++)&0x7f;
121		tag=(int)l;
122		if (--max == 0) goto err;
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
134	if (inf && !(ret & V_ASN1_CONSTRUCTED))
135		goto err;
136
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));
141
142#endif
143	if (*plength > (omax - (p - *pp)))
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;
151	return(ret|inf);
152err:
153	ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
154	return(0x80);
155	}
156
157static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
158	{
159	const unsigned char *p= *pp;
160	unsigned long ret=0;
161	unsigned int i;
162
163	if (max-- < 1) return(0);
164	if (*p == 0x80)
165		{
166		*inf=1;
167		ret=0;
168		p++;
169		}
170	else
171		{
172		*inf=0;
173		i= *p&0x7f;
174		if (*(p++) & 0x80)
175			{
176			if (i > sizeof(long))
177				return 0;
178			if (max-- == 0) return(0);
179			while (i-- > 0)
180				{
181				ret<<=8L;
182				ret|= *(p++);
183				if (max-- == 0) return(0);
184				}
185			}
186		else
187			ret=i;
188		}
189	if (ret > LONG_MAX)
190		return 0;
191	*pp=p;
192	*rl=(long)ret;
193	return(1);
194	}
195
196/* class 0 is constructed
197 * constructed == 2 for indefinite length constructed */
198void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
199	     int xclass)
200	{
201	unsigned char *p= *pp;
202	int i, ttag;
203
204	i=(constructed)?V_ASN1_CONSTRUCTED:0;
205	i|=(xclass&V_ASN1_PRIVATE);
206	if (tag < 31)
207		*(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
208	else
209		{
210		*(p++)=i|V_ASN1_PRIMITIVE_TAG;
211		for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
212		ttag = i;
213		while(i-- > 0)
214			{
215			p[i] = tag & 0x7f;
216			if(i != (ttag - 1)) p[i] |= 0x80;
217			tag >>= 7;
218			}
219		p += ttag;
220		}
221	if (constructed == 2)
222		*(p++)=0x80;
223	else
224		asn1_put_length(&p,length);
225	*pp=p;
226	}
227
228int ASN1_put_eoc(unsigned char **pp)
229	{
230	unsigned char *p = *pp;
231	*p++ = 0;
232	*p++ = 0;
233	*pp = p;
234	return 2;
235	}
236
237static void asn1_put_length(unsigned char **pp, int length)
238	{
239	unsigned char *p= *pp;
240	int i,l;
241	if (length <= 127)
242		*(p++)=(unsigned char)length;
243	else
244		{
245		l=length;
246		for (i=0; l > 0; i++)
247			l>>=8;
248		*(p++)=i|0x80;
249		l=i;
250		while (i-- > 0)
251			{
252			p[i]=length&0xff;
253			length>>=8;
254			}
255		p+=l;
256		}
257	*pp=p;
258	}
259
260int ASN1_object_size(int constructed, int length, int tag)
261	{
262	int ret;
263
264	ret=length;
265	ret++;
266	if (tag >= 31)
267		{
268		while (tag > 0)
269			{
270			tag>>=7;
271			ret++;
272			}
273		}
274	if (constructed == 2)
275		return ret + 3;
276	ret++;
277	if (length > 127)
278		{
279		while (length > 0)
280			{
281			length>>=8;
282			ret++;
283			}
284		}
285	return(ret);
286	}
287
288static int _asn1_Finish(ASN1_const_CTX *c)
289	{
290	if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
291		{
292		if (!ASN1_const_check_infinite_end(&c->p,c->slen))
293			{
294			c->error=ERR_R_MISSING_ASN1_EOS;
295			return(0);
296			}
297		}
298	if (	((c->slen != 0) && !(c->inf & 1)) ||
299		((c->slen < 0) && (c->inf & 1)))
300		{
301		c->error=ERR_R_ASN1_LENGTH_MISMATCH;
302		return(0);
303		}
304	return(1);
305	}
306
307int asn1_Finish(ASN1_CTX *c)
308	{
309	return _asn1_Finish((ASN1_const_CTX *)c);
310	}
311
312int asn1_const_Finish(ASN1_const_CTX *c)
313	{
314	return _asn1_Finish(c);
315	}
316
317int asn1_GetSequence(ASN1_const_CTX *c, long *length)
318	{
319	const unsigned char *q;
320
321	q=c->p;
322	c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
323		*length);
324	if (c->inf & 0x80)
325		{
326		c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
327		return(0);
328		}
329	if (c->tag != V_ASN1_SEQUENCE)
330		{
331		c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
332		return(0);
333		}
334	(*length)-=(c->p-q);
335	if (c->max && (*length < 0))
336		{
337		c->error=ERR_R_ASN1_LENGTH_MISMATCH;
338		return(0);
339		}
340	if (c->inf == (1|V_ASN1_CONSTRUCTED))
341		c->slen= *length+ *(c->pp)-c->p;
342	c->eos=0;
343	return(1);
344	}
345
346ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
347	{
348	ASN1_STRING *ret;
349
350	if (str == NULL) return(NULL);
351	if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
352		return(NULL);
353	if (!ASN1_STRING_set(ret,str->data,str->length))
354		{
355		ASN1_STRING_free(ret);
356		return(NULL);
357		}
358	ret->flags = str->flags;
359	return(ret);
360	}
361
362int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
363	{
364	unsigned char *c;
365	const char *data=_data;
366
367	if (len < 0)
368		{
369		if (data == NULL)
370			return(0);
371		else
372			len=strlen(data);
373		}
374	if ((str->length < len) || (str->data == NULL))
375		{
376		c=str->data;
377		if (c == NULL)
378			str->data=OPENSSL_malloc(len+1);
379		else
380			str->data=OPENSSL_realloc(c,len+1);
381
382		if (str->data == NULL)
383			{
384			ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
385			str->data=c;
386			return(0);
387			}
388		}
389	str->length=len;
390	if (data != NULL)
391		{
392		memcpy(str->data,data,len);
393		/* an allowance for strings :-) */
394		str->data[len]='\0';
395		}
396	return(1);
397	}
398
399void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
400	{
401	if (str->data)
402		OPENSSL_free(str->data);
403	str->data = data;
404	str->length = len;
405	}
406
407ASN1_STRING *ASN1_STRING_new(void)
408	{
409	return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
410	}
411
412
413ASN1_STRING *ASN1_STRING_type_new(int type)
414	{
415	ASN1_STRING *ret;
416
417	ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
418	if (ret == NULL)
419		{
420		ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
421		return(NULL);
422		}
423	ret->length=0;
424	ret->type=type;
425	ret->data=NULL;
426	ret->flags=0;
427	return(ret);
428	}
429
430void ASN1_STRING_free(ASN1_STRING *a)
431	{
432	if (a == NULL) return;
433	if (a->data != NULL) OPENSSL_free(a->data);
434	OPENSSL_free(a);
435	}
436
437int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
438	{
439	int i;
440
441	i=(a->length-b->length);
442	if (i == 0)
443		{
444		i=memcmp(a->data,b->data,a->length);
445		if (i == 0)
446			return(a->type-b->type);
447		else
448			return(i);
449		}
450	else
451		return(i);
452	}
453
454void asn1_add_error(const unsigned char *address, int offset)
455	{
456	char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
457
458	BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
459	BIO_snprintf(buf2,sizeof buf2,"%d",offset);
460	ERR_add_error_data(4,"address=",buf1," offset=",buf2);
461	}
462
463int ASN1_STRING_length(ASN1_STRING *x)
464{ return M_ASN1_STRING_length(x); }
465
466void ASN1_STRING_length_set(ASN1_STRING *x, int len)
467{ M_ASN1_STRING_length_set(x, len); return; }
468
469int ASN1_STRING_type(ASN1_STRING *x)
470{ return M_ASN1_STRING_type(x); }
471
472unsigned char * ASN1_STRING_data(ASN1_STRING *x)
473{ return M_ASN1_STRING_data(x); }
474