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