1 /* crypto/asn1/a_d2i_fp.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/buffer.h>
63 #include <openssl/asn1_mac.h>
64
65 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
66
67 #ifndef NO_OLD_ASN1
68 #ifndef OPENSSL_NO_FP_API
69
70 void *ASN1_d2i_fp(void *(*xnew)(void), d2i_of_void *d2i, FILE *in, void **x)
71 {
72 BIO *b;
73 void *ret;
74
75 if ((b=BIO_new(BIO_s_file())) == NULL)
76 {
77 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
78 return(NULL);
79 }
80 BIO_set_fp(b,in,BIO_NOCLOSE);
81 ret=ASN1_d2i_bio(xnew,d2i,b,x);
82 BIO_free(b);
83 return(ret);
84 }
85 #endif
86
87 void *ASN1_d2i_bio(void *(*xnew)(void), d2i_of_void *d2i, BIO *in, void **x)
88 {
89 BUF_MEM *b = NULL;
90 const unsigned char *p;
91 void *ret=NULL;
92 int len;
93
94 len = asn1_d2i_read_bio(in, &b);
95 if(len < 0) goto err;
96
97 p=(unsigned char *)b->data;
98 ret=d2i(x,&p,len);
99 err:
100 if (b != NULL) BUF_MEM_free(b);
101 return(ret);
102 }
103
104 #endif
105
106 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
107 {
108 BUF_MEM *b = NULL;
109 const unsigned char *p;
110 void *ret=NULL;
111 int len;
112
113 len = asn1_d2i_read_bio(in, &b);
114 if(len < 0) goto err;
115
116 p=(const unsigned char *)b->data;
117 ret=ASN1_item_d2i(x,&p,len, it);
118 err:
119 if (b != NULL) BUF_MEM_free(b);
120 return(ret);
121 }
122
123 #ifndef OPENSSL_NO_FP_API
124 void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
125 {
126 BIO *b;
127 char *ret;
128
129 if ((b=BIO_new(BIO_s_file())) == NULL)
130 {
131 ASN1err(ASN1_F_ASN1_ITEM_D2I_FP,ERR_R_BUF_LIB);
132 return(NULL);
133 }
134 BIO_set_fp(b,in,BIO_NOCLOSE);
135 ret=ASN1_item_d2i_bio(it,b,x);
136 BIO_free(b);
137 return(ret);
138 }
139 #endif
140
141 #define HEADER_SIZE 8
142 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
143 {
144 BUF_MEM *b;
145 unsigned char *p;
146 int i;
147 ASN1_const_CTX c;
148 size_t want=HEADER_SIZE;
149 int eos=0;
150 size_t off=0;
151 size_t len=0;
152
153 b=BUF_MEM_new();
154 if (b == NULL)
155 {
156 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
157 return -1;
158 }
159
160 ERR_clear_error();
161 for (;;)
162 {
163 if (want >= (len-off))
164 {
165 want-=(len-off);
166
167 if (len + want < len || !BUF_MEM_grow_clean(b,len+want))
168 {
169 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
170 goto err;
171 }
172 i=BIO_read(in,&(b->data[len]),want);
173 if ((i < 0) && ((len-off) == 0))
174 {
175 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_NOT_ENOUGH_DATA);
176 goto err;
177 }
178 if (i > 0)
179 {
180 if (len+i < len)
181 {
182 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
183 goto err;
184 }
185 len+=i;
186 }
187 }
188 /* else data already loaded */
189
190 p=(unsigned char *)&(b->data[off]);
191 c.p=p;
192 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
193 len-off);
194 if (c.inf & 0x80)
195 {
196 unsigned long e;
197
198 e=ERR_GET_REASON(ERR_peek_error());
199 if (e != ASN1_R_TOO_LONG)
200 goto err;
201 else
202 ERR_clear_error(); /* clear error */
203 }
204 i=c.p-p;/* header length */
205 off+=i; /* end of data */
206
207 if (c.inf & 1)
208 {
209 /* no data body so go round again */
210 eos++;
211 if (eos < 0)
212 {
213 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_HEADER_TOO_LONG);
214 goto err;
215 }
216 want=HEADER_SIZE;
217 }
218 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
219 {
220 /* eos value, so go back and read another header */
221 eos--;
222 if (eos <= 0)
223 break;
224 else
225 want=HEADER_SIZE;
226 }
227 else
228 {
229 /* suck in c.slen bytes of data */
230 want=c.slen;
231 if (want > (len-off))
232 {
233 want-=(len-off);
234 if (want > INT_MAX /* BIO_read takes an int length */ ||
235 len+want < len)
236 {
237 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
238 goto err;
239 }
240 if (!BUF_MEM_grow_clean(b,len+want))
241 {
242 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
243 goto err;
244 }
245 while (want > 0)
246 {
247 i=BIO_read(in,&(b->data[len]),want);
248 if (i <= 0)
249 {
250 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,
251 ASN1_R_NOT_ENOUGH_DATA);
252 goto err;
253 }
254 /* This can't overflow because
255 * |len+want| didn't overflow. */
256 len+=i;
257 want-=i;
258 }
259 }
260 if (off + c.slen < off)
261 {
262 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
263 goto err;
264 }
265 off+=c.slen;
266 if (eos <= 0)
267 {
268 break;
269 }
270 else
271 want=HEADER_SIZE;
272 }
273 }
274
275 if (off > INT_MAX)
276 {
277 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
278 goto err;
279 }
280
281 *pb = b;
282 return off;
283 err:
284 if (b != NULL) BUF_MEM_free(b);
285 return -1;
286 }