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 { 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 87void *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); 99err: 100 if (b != NULL) BUF_MEM_free(b); 101 return(ret); 102 } 103 104#endif 105 106void *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); 118err: 119 if (b != NULL) BUF_MEM_free(b); 120 return(ret); 121 } 122 123#ifndef OPENSSL_NO_FP_API 124void *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 142static 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; 283err: 284 if (b != NULL) BUF_MEM_free(b); 285 return -1; 286 } 287