release/src/router/openssl/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 <limits.h>
  61 #include "cryptlib.h"
  62 #include <openssl/buffer.h>
  63 #include <openssl/asn1_mac.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
  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         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)
  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
 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
 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         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
 144 static 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 }