268 lines
8.5 KiB
C
268 lines
8.5 KiB
C
/* crypto/asn1/a_d2i_fp.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <limits.h>
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#include "cryptlib.h"
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#include <openssl/buffer.h>
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#include <openssl/asn1_mac.h>
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static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
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#ifndef NO_OLD_ASN1
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# ifndef OPENSSL_NO_FP_API
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void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x)
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{
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BIO *b;
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void *ret;
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if ((b = BIO_new(BIO_s_file())) == NULL) {
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ASN1err(ASN1_F_ASN1_D2I_FP, ERR_R_BUF_LIB);
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return (NULL);
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}
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BIO_set_fp(b, in, BIO_NOCLOSE);
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ret = ASN1_d2i_bio(xnew, d2i, b, x);
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BIO_free(b);
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return (ret);
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}
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# endif
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void *ASN1_d2i_bio(void *(*xnew) (void), d2i_of_void *d2i, BIO *in, void **x)
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{
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BUF_MEM *b = NULL;
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const unsigned char *p;
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void *ret = NULL;
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int len;
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len = asn1_d2i_read_bio(in, &b);
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if (len < 0)
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goto err;
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p = (unsigned char *)b->data;
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ret = d2i(x, &p, len);
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err:
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if (b != NULL)
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BUF_MEM_free(b);
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return (ret);
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}
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#endif
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void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
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{
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BUF_MEM *b = NULL;
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const unsigned char *p;
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void *ret = NULL;
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int len;
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len = asn1_d2i_read_bio(in, &b);
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if (len < 0)
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goto err;
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p = (const unsigned char *)b->data;
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ret = ASN1_item_d2i(x, &p, len, it);
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err:
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if (b != NULL)
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BUF_MEM_free(b);
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return (ret);
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}
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#ifndef OPENSSL_NO_FP_API
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void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
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{
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BIO *b;
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char *ret;
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if ((b = BIO_new(BIO_s_file())) == NULL) {
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ASN1err(ASN1_F_ASN1_ITEM_D2I_FP, ERR_R_BUF_LIB);
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return (NULL);
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}
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BIO_set_fp(b, in, BIO_NOCLOSE);
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ret = ASN1_item_d2i_bio(it, b, x);
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BIO_free(b);
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return (ret);
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}
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#endif
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#define HEADER_SIZE 8
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static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
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{
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BUF_MEM *b;
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unsigned char *p;
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int i;
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ASN1_const_CTX c;
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size_t want = HEADER_SIZE;
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int eos = 0;
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size_t off = 0;
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size_t len = 0;
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b = BUF_MEM_new();
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if (b == NULL) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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ERR_clear_error();
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for (;;) {
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if (want >= (len - off)) {
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want -= (len - off);
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if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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i = BIO_read(in, &(b->data[len]), want);
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if ((i < 0) && ((len - off) == 0)) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_NOT_ENOUGH_DATA);
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goto err;
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}
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if (i > 0) {
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if (len + i < len) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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goto err;
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}
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len += i;
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}
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}
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/* else data already loaded */
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p = (unsigned char *)&(b->data[off]);
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c.p = p;
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c.inf = ASN1_get_object(&(c.p), &(c.slen), &(c.tag), &(c.xclass),
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len - off);
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if (c.inf & 0x80) {
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unsigned long e;
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e = ERR_GET_REASON(ERR_peek_error());
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if (e != ASN1_R_TOO_LONG)
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goto err;
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else
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ERR_clear_error(); /* clear error */
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}
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i = c.p - p; /* header length */
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off += i; /* end of data */
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if (c.inf & 1) {
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/* no data body so go round again */
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eos++;
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if (eos < 0) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_HEADER_TOO_LONG);
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goto err;
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}
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want = HEADER_SIZE;
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} else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC)) {
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/* eos value, so go back and read another header */
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eos--;
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if (eos <= 0)
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break;
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else
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want = HEADER_SIZE;
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} else {
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/* suck in c.slen bytes of data */
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want = c.slen;
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if (want > (len - off)) {
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want -= (len - off);
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if (want > INT_MAX /* BIO_read takes an int length */ ||
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len + want < len) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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goto err;
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}
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if (!BUF_MEM_grow_clean(b, len + want)) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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while (want > 0) {
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i = BIO_read(in, &(b->data[len]), want);
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if (i <= 0) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO,
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ASN1_R_NOT_ENOUGH_DATA);
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goto err;
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}
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/*
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* This can't overflow because |len+want| didn't
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* overflow.
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*/
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len += i;
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want -= i;
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}
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}
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if (off + c.slen < off) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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goto err;
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}
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off += c.slen;
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if (eos <= 0) {
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break;
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} else
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want = HEADER_SIZE;
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}
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}
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if (off > INT_MAX) {
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ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ASN1_R_TOO_LONG);
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goto err;
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}
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*pb = b;
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return off;
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err:
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if (b != NULL)
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BUF_MEM_free(b);
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return -1;
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}
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