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 <limits.h>
60
61 #include <openssl/buf.h>
62 #include <openssl/err.h>
63 #include <openssl/mem.h>
64
65
66 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
67
68 #ifndef NO_OLD_ASN1
69 #ifndef OPENSSL_NO_FP_API
70
ASN1_d2i_fp(void * (* xnew)(void),d2i_of_void * d2i,FILE * in,void ** x)71 void *ASN1_d2i_fp(void *(*xnew)(void), d2i_of_void *d2i, FILE *in, void **x)
72 {
73 BIO *b;
74 void *ret;
75
76 if ((b=BIO_new(BIO_s_file())) == NULL)
77 {
78 OPENSSL_PUT_ERROR(ASN1, ERR_R_BUF_LIB);
79 return(NULL);
80 }
81 BIO_set_fp(b,in,BIO_NOCLOSE);
82 ret=ASN1_d2i_bio(xnew,d2i,b,x);
83 BIO_free(b);
84 return(ret);
85 }
86 #endif
87
ASN1_d2i_bio(void * (* xnew)(void),d2i_of_void * d2i,BIO * in,void ** x)88 void *ASN1_d2i_bio(void *(*xnew)(void), d2i_of_void *d2i, BIO *in, void **x)
89 {
90 BUF_MEM *b = NULL;
91 const unsigned char *p;
92 void *ret=NULL;
93 int len;
94
95 len = asn1_d2i_read_bio(in, &b);
96 if(len < 0) goto err;
97
98 p=(unsigned char *)b->data;
99 ret=d2i(x,&p,len);
100 err:
101 if (b != NULL) BUF_MEM_free(b);
102 return(ret);
103 }
104
105 #endif
106
ASN1_item_d2i_bio(const ASN1_ITEM * it,BIO * in,void * x)107 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
108 {
109 BUF_MEM *b = NULL;
110 const unsigned char *p;
111 void *ret=NULL;
112 int len;
113
114 len = asn1_d2i_read_bio(in, &b);
115 if(len < 0) goto err;
116
117 p=(const unsigned char *)b->data;
118 ret=ASN1_item_d2i(x,&p,len, it);
119 err:
120 if (b != NULL) BUF_MEM_free(b);
121 return(ret);
122 }
123
124 #ifndef OPENSSL_NO_FP_API
ASN1_item_d2i_fp(const ASN1_ITEM * it,FILE * in,void * x)125 void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
126 {
127 BIO *b;
128 char *ret;
129
130 if ((b=BIO_new(BIO_s_file())) == NULL)
131 {
132 OPENSSL_PUT_ERROR(ASN1, ERR_R_BUF_LIB);
133 return(NULL);
134 }
135 BIO_set_fp(b,in,BIO_NOCLOSE);
136 ret=ASN1_item_d2i_bio(it,b,x);
137 BIO_free(b);
138 return(ret);
139 }
140 #endif
141
142 #define HEADER_SIZE 8
143 #define ASN1_CHUNK_INITIAL_SIZE (16 * 1024)
asn1_d2i_read_bio(BIO * in,BUF_MEM ** pb)144 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
145 {
146 BUF_MEM *b;
147 unsigned char *p;
148 int i;
149 ASN1_const_CTX c;
150 size_t want=HEADER_SIZE;
151 int eos=0;
152 size_t off=0;
153 size_t len=0;
154
155 b=BUF_MEM_new();
156 if (b == NULL)
157 {
158 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
159 return -1;
160 }
161
162 ERR_clear_error();
163 for (;;)
164 {
165 if (want >= (len-off))
166 {
167 want-=(len-off);
168
169 if (len + want < len || !BUF_MEM_grow_clean(b,len+want))
170 {
171 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
172 goto err;
173 }
174 i=BIO_read(in,&(b->data[len]),want);
175 if ((i < 0) && ((len-off) == 0))
176 {
177 OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
178 goto err;
179 }
180 if (i > 0)
181 {
182 if (len+i < len)
183 {
184 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
185 goto err;
186 }
187 len+=i;
188 }
189 }
190 /* else data already loaded */
191
192 p=(unsigned char *)&(b->data[off]);
193 c.p=p;
194 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
195 len-off);
196 if (c.inf & 0x80)
197 {
198 uint32_t e;
199
200 e=ERR_GET_REASON(ERR_peek_error());
201 if (e != ASN1_R_TOO_LONG)
202 goto err;
203 else
204 ERR_clear_error(); /* clear error */
205 }
206 i=c.p-p;/* header length */
207 off+=i; /* end of data */
208
209 if (c.inf & 1)
210 {
211 /* no data body so go round again */
212 eos++;
213 if (eos < 0)
214 {
215 OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
216 goto err;
217 }
218 want=HEADER_SIZE;
219 }
220 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
221 {
222 /* eos value, so go back and read another header */
223 eos--;
224 if (eos <= 0)
225 break;
226 else
227 want=HEADER_SIZE;
228 }
229 else
230 {
231 /* suck in c.slen bytes of data */
232 want=c.slen;
233 if (want > (len-off))
234 {
235 size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE;
236 want-=(len-off);
237 if (want > INT_MAX /* BIO_read takes an int length */ ||
238 len+want < len)
239 {
240 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
241 goto err;
242 }
243 while (want > 0)
244 {
245
246 /*
247 * Read content in chunks of increasing size
248 * so we can return an error for EOF without
249 * having to allocate the entire content length
250 * in one go.
251 */
252 size_t chunk = want > chunk_max ? chunk_max : want;
253
254 if (!BUF_MEM_grow_clean(b, len + chunk)) {
255 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
256 goto err;
257 }
258 want -= chunk;
259 while (chunk > 0) {
260 i = BIO_read(in, &(b->data[len]), chunk);
261 if (i <= 0) {
262 OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA);
263 goto err;
264 }
265 /*
266 * This can't overflow because |len+want| didn't
267 * overflow.
268 */
269 len += i;
270 chunk -= i;
271 }
272 if (chunk_max < INT_MAX/2)
273 chunk_max *= 2;
274 }
275 }
276 if (off + c.slen < off)
277 {
278 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
279 goto err;
280 }
281 off+=c.slen;
282 if (eos <= 0)
283 {
284 break;
285 }
286 else
287 want=HEADER_SIZE;
288 }
289 }
290
291 if (off > INT_MAX)
292 {
293 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
294 goto err;
295 }
296
297 *pb = b;
298 return off;
299 err:
300 if (b != NULL) BUF_MEM_free(b);
301 return -1;
302 }
303