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
63 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_CTX *c);
64 /* type is a 'bitmap' of acceptable string types.
65 */
d2i_ASN1_type_bytes(ASN1_STRING ** a,unsigned char ** pp,long length,int type)66 ASN1_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);
123 err:
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
i2d_ASN1_bytes(ASN1_STRING * a,unsigned char ** pp,int tag,int xclass)130 int 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
d2i_ASN1_bytes(ASN1_STRING ** a,unsigned char ** pp,long length,int Ptag,int Pclass)156 ASN1_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);
238 err:
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 */
asn1_collate_primitive(ASN1_STRING * a,ASN1_CTX * c)250 static 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);
306 err:
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