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),
  70                   void *(*d2i)(void **,const unsigned char **,long), FILE *in,
  71                   void **x)
  72         {
  73         BIO *b;
  74         void *ret;
  75
  76         if ((b=BIO_new(BIO_s_file())) == NULL)
  77                 {
  78                 ASN1err(ASN1_F_ASN1_D2I_FP,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
  88 char *ASN1_d2i_bio(void *(*xnew)(void),
  89                    void *(*d2i)(void **,const unsigned char **,long), BIO *in,
  90                    void **x)
  91         {
  92         BUF_MEM *b = NULL;
  93         const unsigned char *p;
  94         void *ret=NULL;
  95         int len;
  96
  97         len = asn1_d2i_read_bio(in, &b);
  98         if(len < 0) goto err;
  99
 100         p=b->data;
 101         ret=d2i(x,&p,len);
 102 err:
 103         if (b != NULL) BUF_MEM_free(b);
 104         return(ret);
 105         }
 106
 107 #endif
 108
 109 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
 110         {
 111         BUF_MEM *b = NULL;
 112         const unsigned char *p;
 113         void *ret=NULL;
 114         int len;
 115
 116         len = asn1_d2i_read_bio(in, &b);
 117         if(len < 0) goto err;
 118
 119         p=(const unsigned char *)b->data;
 120         ret=ASN1_item_d2i(x,&p,len, it);
 121 err:
 122         if (b != NULL) BUF_MEM_free(b);
 123         return(ret);
 124         }
 125
 126 #ifndef OPENSSL_NO_FP_API
 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                 {
 134                 ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
 135                 return(NULL);
 136                 }
 137         BIO_set_fp(b,in,BIO_NOCLOSE);
 138         ret=ASN1_item_d2i_bio(it,b,x);
 139         BIO_free(b);
 140         return(ret);
 141         }
 142 #endif
 143
 144 #define HEADER_SIZE   8
 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         int ret=-1;
 151         ASN1_const_CTX c;
 152         int want=HEADER_SIZE;
 153         int eos=0;
 154 #if defined(__GNUC__) && defined(__ia64)
 155         /* pathetic compiler bug in all known versions as of Nov. 2002 */
 156         long off=0;
 157 #else
 158         int off=0;
 159 #endif
 160         int len=0;
 161
 162         b=BUF_MEM_new();
 163         if (b == NULL)
 164                 {
 165                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
 166                 return -1;
 167                 }
 168
 169         ERR_clear_error();
 170         for (;;)
 171                 {
 172                 if (want >= (len-off))
 173                         {
 174                         want-=(len-off);
 175
 176                         if (!BUF_MEM_grow_clean(b,len+want))
 177                                 {
 178                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
 179                                 goto err;
 180                                 }
 181                         i=BIO_read(in,&(b->data[len]),want);
 182                         if ((i < 0) && ((len-off) == 0))
 183                                 {
 184                                 ASN1err(ASN1_F_ASN1_D2I_BIO,ASN1_R_NOT_ENOUGH_DATA);
 185                                 goto err;
 186                                 }
 187                         if (i > 0)
 188                                 len+=i;
 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                         unsigned long e;
 199
 200                         e=ERR_GET_REASON(ERR_peek_error());
 201                         if (e != ASN1_R_TOO_LONG)
 202                                 goto err;
 203                         else
 204                                 ERR_get_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                         want=HEADER_SIZE;
 214                         }
 215                 else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
 216                         {
 217                         /* eos value, so go back and read another header */
 218                         eos--;
 219                         if (eos <= 0)
 220                                 break;
 221                         else
 222                                 want=HEADER_SIZE;
 223                         }
 224                 else
 225                         {
 226                         /* suck in c.slen bytes of data */
 227                         want=(int)c.slen;
 228                         if (want > (len-off))
 229                                 {
 230                                 want-=(len-off);
 231                                 if (!BUF_MEM_grow_clean(b,len+want))
 232                                         {
 233                                         ASN1err(ASN1_F_ASN1_D2I_BIO,ERR_R_MALLOC_FAILURE);
 234                                         goto err;
 235                                         }
 236                                 while (want > 0)
 237                                         {
 238                                         i=BIO_read(in,&(b->data[len]),want);
 239                                         if (i <= 0)
 240                                                 {
 241                                                 ASN1err(ASN1_F_ASN1_D2I_BIO,
 242                                                     ASN1_R_NOT_ENOUGH_DATA);
 243                                                 goto err;
 244                                                 }
 245                                         len+=i;
 246                                         want -= i;
 247                                         }
 248                                 }
 249                         off+=(int)c.slen;
 250                         if (eos <= 0)
 251                                 {
 252                                 break;
 253                                 }
 254                         else
 255                                 want=HEADER_SIZE;
 256                         }
 257                 }
 258
 259         *pb = b;
 260         return off;
 261 err:
 262         if (b != NULL) BUF_MEM_free(b);
 263         return(ret);
 264         }