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 <openssl/buf.h>
60#include <openssl/err.h>
61#include <openssl/mem.h>
62
63
64static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c);
65/* type is a 'bitmap' of acceptable string types.
66 */
67ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp,
68	     long length, int type)
69	{
70	ASN1_STRING *ret=NULL;
71	const unsigned char *p;
72	unsigned char *s;
73	long len;
74	int inf,tag,xclass;
75	int i=0;
76
77	p= *pp;
78	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
79	if (inf & 0x80) goto err;
80
81	if (tag >= 32)
82		{
83		i=ASN1_R_TAG_VALUE_TOO_HIGH;
84		goto err;
85		}
86	if (!(ASN1_tag2bit(tag) & type))
87		{
88		i=ASN1_R_WRONG_TYPE;
89		goto err;
90		}
91
92	/* If a bit-string, exit early */
93	if (tag == V_ASN1_BIT_STRING)
94		return(d2i_ASN1_BIT_STRING(a,pp,length));
95
96	if ((a == NULL) || ((*a) == NULL))
97		{
98		if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
99		}
100	else
101		ret=(*a);
102
103	if (len != 0)
104		{
105		s=(unsigned char *)OPENSSL_malloc((int)len+1);
106		if (s == NULL)
107			{
108			i=ERR_R_MALLOC_FAILURE;
109			goto err;
110			}
111		memcpy(s,p,(int)len);
112		s[len]='\0';
113		p+=len;
114		}
115	else
116		s=NULL;
117
118	if (ret->data != NULL) OPENSSL_free(ret->data);
119	ret->length=(int)len;
120	ret->data=s;
121	ret->type=tag;
122	if (a != NULL) (*a)=ret;
123	*pp=p;
124	return(ret);
125err:
126	OPENSSL_PUT_ERROR(ASN1, d2i_ASN1_type_bytes, i);
127	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
128		ASN1_STRING_free(ret);
129	return(NULL);
130	}
131
132int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
133	{
134	int ret,r,constructed;
135	unsigned char *p;
136
137	if (a == NULL)  return(0);
138
139	if (tag == V_ASN1_BIT_STRING)
140		return(i2d_ASN1_BIT_STRING(a,pp));
141
142	ret=a->length;
143	r=ASN1_object_size(0,ret,tag);
144	if (pp == NULL) return(r);
145	p= *pp;
146
147	if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
148		constructed=1;
149	else
150		constructed=0;
151	ASN1_put_object(&p,constructed,ret,tag,xclass);
152	memcpy(p,a->data,a->length);
153	p+=a->length;
154	*pp= p;
155	return(r);
156	}
157
158ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,
159	     long length, int Ptag, int Pclass)
160	{
161	ASN1_STRING *ret=NULL;
162	const unsigned char *p;
163	unsigned char *s;
164	long len;
165	int inf,tag,xclass;
166	int i=0;
167
168	if ((a == NULL) || ((*a) == NULL))
169		{
170		if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
171		}
172	else
173		ret=(*a);
174
175	p= *pp;
176	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
177	if (inf & 0x80)
178		{
179		i=ASN1_R_BAD_OBJECT_HEADER;
180		goto err;
181		}
182
183	if (tag != Ptag)
184		{
185		i=ASN1_R_WRONG_TAG;
186		goto err;
187		}
188
189	if (inf & V_ASN1_CONSTRUCTED)
190		{
191		ASN1_const_CTX c;
192
193		c.pp=pp;
194		c.p=p;
195		c.inf=inf;
196		c.slen=len;
197		c.tag=Ptag;
198		c.xclass=Pclass;
199		c.max=(length == 0)?0:(p+length);
200		if (!asn1_collate_primitive(ret,&c))
201			goto err;
202		else
203			{
204			p=c.p;
205			}
206		}
207	else
208		{
209		if (len != 0)
210			{
211			if ((ret->length < len) || (ret->data == NULL))
212				{
213				if (ret->data != NULL) OPENSSL_free(ret->data);
214				s=(unsigned char *)OPENSSL_malloc((int)len + 1);
215				if (s == NULL)
216					{
217					i=ERR_R_MALLOC_FAILURE;
218					goto err;
219					}
220				}
221			else
222				s=ret->data;
223			memcpy(s,p,(int)len);
224			s[len] = '\0';
225			p+=len;
226			}
227		else
228			{
229			s=NULL;
230			if (ret->data != NULL) OPENSSL_free(ret->data);
231			}
232
233		ret->length=(int)len;
234		ret->data=s;
235		ret->type=Ptag;
236		}
237
238	if (a != NULL) (*a)=ret;
239	*pp=p;
240	return(ret);
241err:
242	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
243		ASN1_STRING_free(ret);
244	OPENSSL_PUT_ERROR(ASN1, d2i_ASN1_bytes, i);
245	return(NULL);
246	}
247
248
249/* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse
250 * them into the one structure that is then returned */
251/* There have been a few bug fixes for this function from
252 * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
253static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c)
254	{
255	ASN1_STRING *os=NULL;
256	BUF_MEM b;
257	int num;
258
259	b.length=0;
260	b.max=0;
261	b.data=NULL;
262
263	if (a == NULL)
264		{
265		c->error=ERR_R_PASSED_NULL_PARAMETER;
266		goto err;
267		}
268
269	num=0;
270	for (;;)
271		{
272		if (c->inf & 1)
273			{
274			c->eos=ASN1_const_check_infinite_end(&c->p,
275				(long)(c->max-c->p));
276			if (c->eos) break;
277			}
278		else
279			{
280			if (c->slen <= 0) break;
281			}
282
283		c->q=c->p;
284		if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
285			== NULL)
286			{
287			c->error=ERR_R_ASN1_LIB;
288			goto err;
289			}
290
291		if (!BUF_MEM_grow_clean(&b,num+os->length))
292			{
293			c->error=ERR_R_BUF_LIB;
294			goto err;
295			}
296		memcpy(&(b.data[num]),os->data,os->length);
297		if (!(c->inf & 1))
298			c->slen-=(c->p-c->q);
299		num+=os->length;
300		}
301
302	if (!asn1_const_Finish(c)) goto err;
303
304	a->length=num;
305	if (a->data != NULL) OPENSSL_free(a->data);
306	a->data=(unsigned char *)b.data;
307	if (os != NULL) ASN1_STRING_free(os);
308	return(1);
309err:
310	OPENSSL_PUT_ERROR(ASN1, asn1_collate_primitive, c->error);
311	if (os != NULL) ASN1_STRING_free(os);
312	if (b.data != NULL) OPENSSL_free(b.data);
313	return(0);
314	}
315
316