a_d2i_fp.c

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/* crypto/asn1/a_d2i_fp.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([email protected]).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young ([email protected])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([email protected])"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <limits.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/asn1_mac.h>

static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);

#ifndef NO_OLD_ASN1
#ifndef OPENSSL_NO_FP_API

void *ASN1_d2i_fp(void *(*xnew)(void), d2i_of_void *d2i, FILE *in, void **x)
        {
        BIO *b;
        void *ret;

        if ((b=BIO_new(BIO_s_file())) == NULL)
        {
        ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
                return(NULL);
        }
        BIO_set_fp(b,in,BIO_NOCLOSE);
        ret=ASN1_d2i_bio(xnew,d2i,b,x);
        BIO_free(b);
        return(ret);
        }
#endif

void *ASN1_d2i_bio(void *(*xnew)(void), d2i_of_void *d2i, BIO *in, void **x)
    {
    BUF_MEM *b = NULL;
    const unsigned char *p;
    void *ret=NULL;
    int len;

    len = asn1_d2i_read_bio(in, &b);
    if(len < 0) goto err;

    p=(unsigned char *)b->data;
    ret=d2i(x,&p,len);
err:
    if (b != NULL) BUF_MEM_free(b);
    return(ret);
    }

#endif

void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
    {
    BUF_MEM *b = NULL;
    const unsigned char *p;
    void *ret=NULL;
    int len;

    len = asn1_d2i_read_bio(in, &b);
    if(len < 0) goto err;

    p=(const unsigned char *)b->data;
    ret=ASN1_item_d2i(x,&p,len, it);
err:
    if (b != NULL) BUF_MEM_free(b);
    return(ret);
    }

#ifndef OPENSSL_NO_FP_API
void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
        {
        BIO *b;
        char *ret;

        if ((b=BIO_new(BIO_s_file())) == NULL)
        {
        ASN1err(ASN1_F_ASN1_ITEM_D2I_FP,ERR_R_BUF_LIB);
                return(NULL);
        }
        BIO_set_fp(b,in,BIO_NOCLOSE);
        ret=ASN1_item_d2i_bio(it,b,x);
        BIO_free(b);
        return(ret);
        }
#endif

#define HEADER_SIZE   8
static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
    {
    BUF_MEM *b;
    unsigned char *p;
    int i;
    ASN1_const_CTX c;
    size_t want=HEADER_SIZE;
    int eos=0;
    size_t off=0;
    size_t len=0;

    b=BUF_MEM_new();
    if (b == NULL)
        {
        ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
        return -1;
        }

    ERR_clear_error();
    for (;;)
        {
        if (want >= (len-off))
            {
            want-=(len-off);

            if (len + want < len || !BUF_MEM_grow_clean(b,len+want))
                {
                ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
                goto err;
                }
            i=BIO_read(in,&(b->data[len]),want);
            if ((i < 0) && ((len-off) == 0))
                {
                ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_NOT_ENOUGH_DATA);
                goto err;
                }
            if (i > 0)
                {
                if (len+i < len)
                    {
                    ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
                    goto err;
                    }
                len+=i;
                }
            }
        /* else data already loaded */

        p=(unsigned char *)&(b->data[off]);
        c.p=p;
        c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
            len-off);
        if (c.inf & 0x80)
            {
            unsigned long e;

            e=ERR_GET_REASON(ERR_peek_error());
            if (e != ASN1_R_TOO_LONG)
                goto err;
            else
                ERR_clear_error(); /* clear error */
            }
        i=c.p-p;/* header length */
        off+=i; /* end of data */

        if (c.inf & 1)
            {
            /* no data body so go round again */
            eos++;
            if (eos < 0)
                {
                ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_HEADER_TOO_LONG);
                goto err;
                }
            want=HEADER_SIZE;
            }
        else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
            {
            /* eos value, so go back and read another header */
            eos--;
            if (eos <= 0)
                break;
            else
                want=HEADER_SIZE;
            }
        else 
            {
            /* suck in c.slen bytes of data */
            want=c.slen;
            if (want > (len-off))
                {
                want-=(len-off);
                if (want > INT_MAX /* BIO_read takes an int length */ ||
                    len+want < len)
                        {
                        ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
                        goto err;
                        }
                if (!BUF_MEM_grow_clean(b,len+want))
                    {
                    ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
                    goto err;
                    }
                while (want > 0)
                    {
                    i=BIO_read(in,&(b->data[len]),want);
                    if (i <= 0)
                        {
                        ASN1err(ASN1_F_ASN1_D2I_READ_BIO,
                            ASN1_R_NOT_ENOUGH_DATA);
                        goto err;
                        }
                    /* This can't overflow because
                     * |len+want| didn't overflow. */
                    len+=i;
                    want-=i;
                    }
                }
            if (off + c.slen < off)
                {
                ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
                goto err;
                }
            off+=c.slen;
            if (eos <= 0)
                {
                break;
                }
            else
                want=HEADER_SIZE;
            }
        }

    if (off > INT_MAX)
        {
        ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
        goto err;
        }

    *pb = b;
    return off;
err:
    if (b != NULL) BUF_MEM_free(b);
    return -1;
    }