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 <string.h>
60 
61 #include <openssl/buf.h>
62 #include <openssl/err.h>
63 #include <openssl/mem.h>
64 
65 
66 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c);
67 /* type is a 'bitmap' of acceptable string types.
68  */
d2i_ASN1_type_bytes(ASN1_STRING ** a,const unsigned char ** pp,long length,int type)69 ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp,
70 	     long length, int type)
71 	{
72 	ASN1_STRING *ret=NULL;
73 	const unsigned char *p;
74 	unsigned char *s;
75 	long len;
76 	int inf,tag,xclass;
77 	int i=0;
78 
79 	p= *pp;
80 	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
81 	if (inf & 0x80) goto err;
82 
83 	if (tag >= 32)
84 		{
85 		i=ASN1_R_TAG_VALUE_TOO_HIGH;
86 		goto err;
87 		}
88 	if (!(ASN1_tag2bit(tag) & type))
89 		{
90 		i=ASN1_R_WRONG_TYPE;
91 		goto err;
92 		}
93 
94 	/* If a bit-string, exit early */
95 	if (tag == V_ASN1_BIT_STRING)
96 		return(d2i_ASN1_BIT_STRING(a,pp,length));
97 
98 	if ((a == NULL) || ((*a) == NULL))
99 		{
100 		if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
101 		}
102 	else
103 		ret=(*a);
104 
105 	if (len != 0)
106 		{
107 		s=(unsigned char *)OPENSSL_malloc((int)len+1);
108 		if (s == NULL)
109 			{
110 			i=ERR_R_MALLOC_FAILURE;
111 			goto err;
112 			}
113 		memcpy(s,p,(int)len);
114 		s[len]='\0';
115 		p+=len;
116 		}
117 	else
118 		s=NULL;
119 
120 	if (ret->data != NULL) OPENSSL_free(ret->data);
121 	ret->length=(int)len;
122 	ret->data=s;
123 	ret->type=tag;
124 	if (a != NULL) (*a)=ret;
125 	*pp=p;
126 	return(ret);
127 err:
128 	OPENSSL_PUT_ERROR(ASN1, i);
129 	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
130 		ASN1_STRING_free(ret);
131 	return(NULL);
132 	}
133 
i2d_ASN1_bytes(ASN1_STRING * a,unsigned char ** pp,int tag,int xclass)134 int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
135 	{
136 	int ret,r,constructed;
137 	unsigned char *p;
138 
139 	if (a == NULL)  return(0);
140 
141 	if (tag == V_ASN1_BIT_STRING)
142 		return(i2d_ASN1_BIT_STRING(a,pp));
143 
144 	ret=a->length;
145 	r=ASN1_object_size(0,ret,tag);
146 	if (pp == NULL) return(r);
147 	p= *pp;
148 
149 	if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
150 		constructed=1;
151 	else
152 		constructed=0;
153 	ASN1_put_object(&p,constructed,ret,tag,xclass);
154 	memcpy(p,a->data,a->length);
155 	p+=a->length;
156 	*pp= p;
157 	return(r);
158 	}
159 
d2i_ASN1_bytes(ASN1_STRING ** a,const unsigned char ** pp,long length,int Ptag,int Pclass)160 ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,
161 	     long length, int Ptag, int Pclass)
162 	{
163 	ASN1_STRING *ret=NULL;
164 	const unsigned char *p;
165 	unsigned char *s;
166 	long len;
167 	int inf,tag,xclass;
168 	int i=0;
169 
170 	if ((a == NULL) || ((*a) == NULL))
171 		{
172 		if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
173 		}
174 	else
175 		ret=(*a);
176 
177 	p= *pp;
178 	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
179 	if (inf & 0x80)
180 		{
181 		i=ASN1_R_BAD_OBJECT_HEADER;
182 		goto err;
183 		}
184 
185 	if (tag != Ptag)
186 		{
187 		i=ASN1_R_WRONG_TAG;
188 		goto err;
189 		}
190 
191 	if (inf & V_ASN1_CONSTRUCTED)
192 		{
193 		ASN1_const_CTX c;
194 
195 		c.pp=pp;
196 		c.p=p;
197 		c.inf=inf;
198 		c.slen=len;
199 		c.tag=Ptag;
200 		c.xclass=Pclass;
201 		c.max=(length == 0)?0:(p+length);
202 		if (!asn1_collate_primitive(ret,&c))
203 			goto err;
204 		else
205 			{
206 			p=c.p;
207 			}
208 		}
209 	else
210 		{
211 		if (len != 0)
212 			{
213 			if ((ret->length < len) || (ret->data == NULL))
214 				{
215 				if (ret->data != NULL) OPENSSL_free(ret->data);
216 				s=(unsigned char *)OPENSSL_malloc((int)len + 1);
217 				if (s == NULL)
218 					{
219 					i=ERR_R_MALLOC_FAILURE;
220 					goto err;
221 					}
222 				}
223 			else
224 				s=ret->data;
225 			memcpy(s,p,(int)len);
226 			s[len] = '\0';
227 			p+=len;
228 			}
229 		else
230 			{
231 			s=NULL;
232 			if (ret->data != NULL) OPENSSL_free(ret->data);
233 			}
234 
235 		ret->length=(int)len;
236 		ret->data=s;
237 		ret->type=Ptag;
238 		}
239 
240 	if (a != NULL) (*a)=ret;
241 	*pp=p;
242 	return(ret);
243 err:
244 	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
245 		ASN1_STRING_free(ret);
246 	OPENSSL_PUT_ERROR(ASN1, i);
247 	return(NULL);
248 	}
249 
250 
251 /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse
252  * them into the one structure that is then returned */
253 /* There have been a few bug fixes for this function from
254  * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
asn1_collate_primitive(ASN1_STRING * a,ASN1_const_CTX * c)255 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c)
256 	{
257 	ASN1_STRING *os=NULL;
258 	BUF_MEM b;
259 	int num;
260 
261 	b.length=0;
262 	b.max=0;
263 	b.data=NULL;
264 
265 	if (a == NULL)
266 		{
267 		c->error=ERR_R_PASSED_NULL_PARAMETER;
268 		goto err;
269 		}
270 
271 	num=0;
272 	for (;;)
273 		{
274 		if (c->inf & 1)
275 			{
276 			c->eos=ASN1_const_check_infinite_end(&c->p,
277 				(long)(c->max-c->p));
278 			if (c->eos) break;
279 			}
280 		else
281 			{
282 			if (c->slen <= 0) break;
283 			}
284 
285 		c->q=c->p;
286 		if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
287 			== NULL)
288 			{
289 			c->error=ERR_R_ASN1_LIB;
290 			goto err;
291 			}
292 
293 		if (!BUF_MEM_grow_clean(&b,num+os->length))
294 			{
295 			c->error=ERR_R_BUF_LIB;
296 			goto err;
297 			}
298 		memcpy(&(b.data[num]),os->data,os->length);
299 		if (!(c->inf & 1))
300 			c->slen-=(c->p-c->q);
301 		num+=os->length;
302 		}
303 
304 	if (!asn1_const_Finish(c)) goto err;
305 
306 	a->length=num;
307 	if (a->data != NULL) OPENSSL_free(a->data);
308 	a->data=(unsigned char *)b.data;
309 	if (os != NULL) ASN1_STRING_free(os);
310 	return(1);
311 err:
312 	OPENSSL_PUT_ERROR(ASN1, c->error);
313 	if (os != NULL) ASN1_STRING_free(os);
314 	if (b.data != NULL) OPENSSL_free(b.data);
315 	return(0);
316 	}
317 
318