a_d2i_fp.c revision 296465
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 65static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb); 66 67#ifndef NO_OLD_ASN1 68# ifndef OPENSSL_NO_FP_API 69 70void *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 ASN1err(ASN1_F_ASN1_D2I_FP, 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 86void *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 107void *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 127void *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 ASN1err(ASN1_F_ASN1_ITEM_D2I_FP, 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 144static 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 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE); 158 return -1; 159 } 160 161 ERR_clear_error(); 162 for (;;) { 163 if (want >= (len - off)) { 164 want -= (len - off); 165 166 if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) { 167 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE); 168 goto err; 169 } 170 i = BIO_read(in, &(b->data[len]), want); 171 if ((i < 0) && ((len - off) == 0)) { 172 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_NOT_ENOUGH_DATA); 173 goto err; 174 } 175 if (i > 0) { 176 if (len + i < len) { 177 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); 178 goto err; 179 } 180 len += i; 181 } 182 } 183 /* else data already loaded */ 184 185 p = (unsigned char *)&(b->data[off]); 186 c.p = p; 187 c.inf = ASN1_get_object(&(c.p), &(c.slen), &(c.tag), &(c.xclass), 188 len - off); 189 if (c.inf & 0x80) { 190 unsigned long e; 191 192 e = ERR_GET_REASON(ERR_peek_error()); 193 if (e != ASN1_R_TOO_LONG) 194 goto err; 195 else 196 ERR_clear_error(); /* clear error */ 197 } 198 i = c.p - p; /* header length */ 199 off += i; /* end of data */ 200 201 if (c.inf & 1) { 202 /* no data body so go round again */ 203 eos++; 204 if (eos < 0) { 205 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_HEADER_TOO_LONG); 206 goto err; 207 } 208 want = HEADER_SIZE; 209 } else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC)) { 210 /* eos value, so go back and read another header */ 211 eos--; 212 if (eos <= 0) 213 break; 214 else 215 want = HEADER_SIZE; 216 } else { 217 /* suck in c.slen bytes of data */ 218 want = c.slen; 219 if (want > (len - off)) { 220 want -= (len - off); 221 if (want > INT_MAX /* BIO_read takes an int length */ || 222 len + want < len) { 223 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); 224 goto err; 225 } 226 if (!BUF_MEM_grow_clean(b, len + want)) { 227 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE); 228 goto err; 229 } 230 while (want > 0) { 231 i = BIO_read(in, &(b->data[len]), want); 232 if (i <= 0) { 233 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, 234 ASN1_R_NOT_ENOUGH_DATA); 235 goto err; 236 } 237 /* 238 * This can't overflow because |len+want| didn't 239 * overflow. 240 */ 241 len += i; 242 want -= i; 243 } 244 } 245 if (off + c.slen < off) { 246 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); 247 goto err; 248 } 249 off += c.slen; 250 if (eos <= 0) { 251 break; 252 } else 253 want = HEADER_SIZE; 254 } 255 } 256 257 if (off > INT_MAX) { 258 ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG); 259 goto err; 260 } 261 262 *pb = b; 263 return off; 264 err: 265 if (b != NULL) 266 BUF_MEM_free(b); 267 return -1; 268} 269