crypto/asn1/a_d2i_fp.c

   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 "cryptlib.h"
  61 #include <openssl/buffer.h>
  62 #include <openssl/asn1_mac.h>
  63
  64 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
  65
  66 #ifndef NO_OLD_ASN1
  67 #ifndef OPENSSL_NO_FP_API
  68
  69 void *ASN1_d2i_fp(void *(*xnew)(void), d2i_of_void *d2i, FILE *in, void **x)
  70         {
  71         BIO *b;
  72         void *ret;
  73
  74         if ((b=BIO_new(BIO_s_file())) == NULL)
  75                 {
  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
  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) goto err;
  95
  96         p=(unsigned char *)b->data;
  97         ret=d2i(x,&p,len);
  98 err:
  99         if (b != NULL) BUF_MEM_free(b);
 100         return(ret);
 101         }
 102
 103 #endif
 104
 105 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
 106         {
 107         BUF_MEM *b = NULL;
 108         const unsigned char *p;
 109         void *ret=NULL;
 110         int len;
 111
 112         len = asn1_d2i_read_bio(in, &b);
 113         if(len < 0) goto err;
 114
 115         p=(const unsigned char *)b->data;
 116         ret=ASN1_item_d2i(x,&p,len, it);
 117 err:
 118         if (b != NULL) BUF_MEM_free(b);
 119         return(ret);
 120         }
 121
 122 #ifndef OPENSSL_NO_FP_API
 123 void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
 124         {
 125         BIO *b;
 126         char *ret;
 127
 128         if ((b=BIO_new(BIO_s_file())) == NULL)
 129                 {
 130                 ASN1err(ASN1_F_ASN1_ITEM_D2I_FP,ERR_R_BUF_LIB);
 131                 return(NULL);
 132                 }
 133         BIO_set_fp(b,in,BIO_NOCLOSE);
 134         ret=ASN1_item_d2i_bio(it,b,x);
 135         BIO_free(b);
 136         return(ret);
 137         }
 138 #endif
 139
 140 #define HEADER_SIZE   8
 141 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
 142         {
 143         BUF_MEM *b;
 144         unsigned char *p;
 145         int i;
 146         int ret=-1;
 147         ASN1_const_CTX c;
 148         int want=HEADER_SIZE;
 149         int eos=0;
 150 #if defined(__GNUC__) && defined(__ia64)
 151         /* pathetic compiler bug in all known versions as of Nov. 2002 */
 152         long off=0;
 153 #else
 154         int off=0;
 155 #endif
 156         int len=0;
 157
 158         b=BUF_MEM_new();
 159         if (b == NULL)
 160                 {
 161                 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
 162                 return -1;
 163                 }
 164
 165         ERR_clear_error();
 166         for (;;)
 167                 {
 168                 if (want >= (len-off))
 169                         {
 170                         want-=(len-off);
 171
 172                         if (!BUF_MEM_grow_clean(b,len+want))
 173                                 {
 174                                 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
 175                                 goto err;
 176                                 }
 177                         i=BIO_read(in,&(b->data[len]),want);
 178                         if ((i < 0) && ((len-off) == 0))
 179                                 {
 180                                 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_NOT_ENOUGH_DATA);
 181                                 goto err;
 182                                 }
 183                         if (i > 0)
 184                                 len+=i;
 185                         }
 186                 /* else data already loaded */
 187
 188                 p=(unsigned char *)&(b->data[off]);
 189                 c.p=p;
 190                 c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
 191                         len-off);
 192                 if (c.inf & 0x80)
 193                         {
 194                         unsigned long e;
 195
 196                         e=ERR_GET_REASON(ERR_peek_error());
 197                         if (e != ASN1_R_TOO_LONG)
 198                                 goto err;
 199                         else
 200                                 ERR_clear_error(); /* clear error */
 201                         }
 202                 i=c.p-p;/* header length */
 203                 off+=i; /* end of data */
 204
 205                 if (c.inf & 1)
 206                         {
 207                         /* no data body so go round again */
 208                         eos++;
 209                         want=HEADER_SIZE;
 210                         }
 211                 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
 212                         {
 213                         /* eos value, so go back and read another header */
 214                         eos--;
 215                         if (eos <= 0)
 216                                 break;
 217                         else
 218                                 want=HEADER_SIZE;
 219                         }
 220                 else
 221                         {
 222                         /* suck in c.slen bytes of data */
 223                         want=(int)c.slen;
 224                         if (want > (len-off))
 225                                 {
 226                                 want-=(len-off);
 227                                 if (!BUF_MEM_grow_clean(b,len+want))
 228                                         {
 229                                         ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
 230                                         goto err;
 231                                         }
 232                                 while (want > 0)
 233                                         {
 234                                         i=BIO_read(in,&(b->data[len]),want);
 235                                         if (i <= 0)
 236                                                 {
 237                                                 ASN1err(ASN1_F_ASN1_D2I_READ_BIO,
 238                                                     ASN1_R_NOT_ENOUGH_DATA);
 239                                                 goto err;
 240                                                 }
 241                                         len+=i;
 242                                         want -= i;
 243                                         }
 244                                 }
 245                         off+=(int)c.slen;
 246                         if (eos <= 0)
 247                                 {
 248                                 break;
 249                                 }
 250                         else
 251                                 want=HEADER_SIZE;
 252                         }
 253                 }
 254
 255         *pb = b;
 256         return off;
 257 err:
 258         if (b != NULL) BUF_MEM_free(b);
 259         return(ret);
 260         }