1/* crypto/asn1/a_bytes.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 "cryptlib.h"
61#include <openssl/asn1.h>
62
63static int asn1_collate_primitive(ASN1_STRING *a, ASN1_CTX *c);
64/* type is a 'bitmap' of acceptable string types.
65 */
66ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, unsigned char **pp,
67	     long length, int type)
68	{
69	ASN1_STRING *ret=NULL;
70	unsigned char *p,*s;
71	long len;
72	int inf,tag,xclass;
73	int i=0;
74
75	p= *pp;
76	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
77	if (inf & 0x80) goto err;
78
79	if (tag >= 32)
80		{
81		i=ASN1_R_TAG_VALUE_TOO_HIGH;;
82		goto err;
83		}
84	if (!(ASN1_tag2bit(tag) & type))
85		{
86		i=ASN1_R_WRONG_TYPE;
87		goto err;
88		}
89
90	/* If a bit-string, exit early */
91	if (tag == V_ASN1_BIT_STRING)
92		return(d2i_ASN1_BIT_STRING(a,pp,length));
93
94	if ((a == NULL) || ((*a) == NULL))
95		{
96		if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
97		}
98	else
99		ret=(*a);
100
101	if (len != 0)
102		{
103		s=(unsigned char *)OPENSSL_malloc((int)len+1);
104		if (s == NULL)
105			{
106			i=ERR_R_MALLOC_FAILURE;
107			goto err;
108			}
109		memcpy(s,p,(int)len);
110		s[len]='\0';
111		p+=len;
112		}
113	else
114		s=NULL;
115
116	if (ret->data != NULL) OPENSSL_free(ret->data);
117	ret->length=(int)len;
118	ret->data=s;
119	ret->type=tag;
120	if (a != NULL) (*a)=ret;
121	*pp=p;
122	return(ret);
123err:
124	ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
125	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
126		ASN1_STRING_free(ret);
127	return(NULL);
128	}
129
130int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
131	{
132	int ret,r,constructed;
133	unsigned char *p;
134
135	if (a == NULL)  return(0);
136
137	if (tag == V_ASN1_BIT_STRING)
138		return(i2d_ASN1_BIT_STRING(a,pp));
139
140	ret=a->length;
141	r=ASN1_object_size(0,ret,tag);
142	if (pp == NULL) return(r);
143	p= *pp;
144
145	if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
146		constructed=1;
147	else
148		constructed=0;
149	ASN1_put_object(&p,constructed,ret,tag,xclass);
150	memcpy(p,a->data,a->length);
151	p+=a->length;
152	*pp= p;
153	return(r);
154	}
155
156ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, unsigned char **pp, long length,
157	     int Ptag, int Pclass)
158	{
159	ASN1_STRING *ret=NULL;
160	unsigned char *p,*s;
161	long len;
162	int inf,tag,xclass;
163	int i=0;
164
165	if ((a == NULL) || ((*a) == NULL))
166		{
167		if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
168		}
169	else
170		ret=(*a);
171
172	p= *pp;
173	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
174	if (inf & 0x80)
175		{
176		i=ASN1_R_BAD_OBJECT_HEADER;
177		goto err;
178		}
179
180	if (tag != Ptag)
181		{
182		i=ASN1_R_WRONG_TAG;
183		goto err;
184		}
185
186	if (inf & V_ASN1_CONSTRUCTED)
187		{
188		ASN1_CTX c;
189
190		c.pp=pp;
191		c.p=p;
192		c.inf=inf;
193		c.slen=len;
194		c.tag=Ptag;
195		c.xclass=Pclass;
196		c.max=(length == 0)?0:(p+length);
197		if (!asn1_collate_primitive(ret,&c))
198			goto err;
199		else
200			{
201			p=c.p;
202			}
203		}
204	else
205		{
206		if (len != 0)
207			{
208			if ((ret->length < len) || (ret->data == NULL))
209				{
210				if (ret->data != NULL) OPENSSL_free(ret->data);
211				s=(unsigned char *)OPENSSL_malloc((int)len + 1);
212				if (s == NULL)
213					{
214					i=ERR_R_MALLOC_FAILURE;
215					goto err;
216					}
217				}
218			else
219				s=ret->data;
220			memcpy(s,p,(int)len);
221			s[len] = '\0';
222			p+=len;
223			}
224		else
225			{
226			s=NULL;
227			if (ret->data != NULL) OPENSSL_free(ret->data);
228			}
229
230		ret->length=(int)len;
231		ret->data=s;
232		ret->type=Ptag;
233		}
234
235	if (a != NULL) (*a)=ret;
236	*pp=p;
237	return(ret);
238err:
239	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
240		ASN1_STRING_free(ret);
241	ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
242	return(NULL);
243	}
244
245
246/* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse
247 * them into the one structure that is then returned */
248/* There have been a few bug fixes for this function from
249 * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
250static int asn1_collate_primitive(ASN1_STRING *a, ASN1_CTX *c)
251	{
252	ASN1_STRING *os=NULL;
253	BUF_MEM b;
254	int num;
255
256	b.length=0;
257	b.max=0;
258	b.data=NULL;
259
260	if (a == NULL)
261		{
262		c->error=ERR_R_PASSED_NULL_PARAMETER;
263		goto err;
264		}
265
266	num=0;
267	for (;;)
268		{
269		if (c->inf & 1)
270			{
271			c->eos=ASN1_check_infinite_end(&c->p,
272				(long)(c->max-c->p));
273			if (c->eos) break;
274			}
275		else
276			{
277			if (c->slen <= 0) break;
278			}
279
280		c->q=c->p;
281		if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
282			== NULL)
283			{
284			c->error=ERR_R_ASN1_LIB;
285			goto err;
286			}
287
288		if (!BUF_MEM_grow_clean(&b,num+os->length))
289			{
290			c->error=ERR_R_BUF_LIB;
291			goto err;
292			}
293		memcpy(&(b.data[num]),os->data,os->length);
294		if (!(c->inf & 1))
295			c->slen-=(c->p-c->q);
296		num+=os->length;
297		}
298
299	if (!asn1_Finish(c)) goto err;
300
301	a->length=num;
302	if (a->data != NULL) OPENSSL_free(a->data);
303	a->data=(unsigned char *)b.data;
304	if (os != NULL) ASN1_STRING_free(os);
305	return(1);
306err:
307	ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error);
308	if (os != NULL) ASN1_STRING_free(os);
309	if (b.data != NULL) OPENSSL_free(b.data);
310	return(0);
311	}
312
313