ssl_rsa.c

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/* ssl/ssl_rsa.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 "ssl_locl.h"
#include <openssl/bio.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pem.h>

static int ssl_set_cert(CERT *c, X509 *x509);
static int ssl_set_pkey(CERT *c, EVP_PKEY *pkey);
int SSL_use_certificate(SSL *ssl, X509 *x)
    {
    if (x == NULL)
        {
        SSLerr(SSL_F_SSL_USE_CERTIFICATE,ERR_R_PASSED_NULL_PARAMETER);
        return(0);
        }
    if (!ssl_cert_inst(&ssl->cert))
        {
        SSLerr(SSL_F_SSL_USE_CERTIFICATE,ERR_R_MALLOC_FAILURE);
        return(0);
        }
    return(ssl_set_cert(ssl->cert,x));
    }

#ifndef OPENSSL_NO_STDIO
int SSL_use_certificate_file(SSL *ssl, const char *file, int type)
    {
    int j;
    BIO *in;
    int ret=0;
    X509 *x=NULL;

    in=BIO_new(BIO_s_file_internal());
    if (in == NULL)
        {
        SSLerr(SSL_F_SSL_USE_CERTIFICATE_FILE,ERR_R_BUF_LIB);
        goto end;
        }

    if (BIO_read_filename(in,file) <= 0)
        {
        SSLerr(SSL_F_SSL_USE_CERTIFICATE_FILE,ERR_R_SYS_LIB);
        goto end;
        }
    if (type == SSL_FILETYPE_ASN1)
        {
        j=ERR_R_ASN1_LIB;
        x=d2i_X509_bio(in,NULL);
        }
    else if (type == SSL_FILETYPE_PEM)
        {
        j=ERR_R_PEM_LIB;
        x=PEM_read_bio_X509(in,NULL,ssl->ctx->default_passwd_callback,ssl->ctx->default_passwd_callback_userdata);
        }
    else
        {
        SSLerr(SSL_F_SSL_USE_CERTIFICATE_FILE,SSL_R_BAD_SSL_FILETYPE);
        goto end;
        }

    if (x == NULL)
        {
        SSLerr(SSL_F_SSL_USE_CERTIFICATE_FILE,j);
        goto end;
        }

    ret=SSL_use_certificate(ssl,x);
end:
    if (x != NULL) X509_free(x);
    if (in != NULL) BIO_free(in);
    return(ret);
    }
#endif

int SSL_use_certificate_ASN1(SSL *ssl, const unsigned char *d, int len)
    {
    X509 *x;
    int ret;

    x=d2i_X509(NULL,&d,(long)len);
    if (x == NULL)
        {
        SSLerr(SSL_F_SSL_USE_CERTIFICATE_ASN1,ERR_R_ASN1_LIB);
        return(0);
        }

    ret=SSL_use_certificate(ssl,x);
    X509_free(x);
    return(ret);
    }

#ifndef OPENSSL_NO_RSA
int SSL_use_RSAPrivateKey(SSL *ssl, RSA *rsa)
    {
    EVP_PKEY *pkey;
    int ret;

    if (rsa == NULL)
        {
        SSLerr(SSL_F_SSL_USE_RSAPRIVATEKEY,ERR_R_PASSED_NULL_PARAMETER);
        return(0);
        }
    if (!ssl_cert_inst(&ssl->cert))
        {
        SSLerr(SSL_F_SSL_USE_RSAPRIVATEKEY,ERR_R_MALLOC_FAILURE);
        return(0);
        }
    if ((pkey=EVP_PKEY_new()) == NULL)
        {
        SSLerr(SSL_F_SSL_USE_RSAPRIVATEKEY,ERR_R_EVP_LIB);
        return(0);
        }

    RSA_up_ref(rsa);
    EVP_PKEY_assign_RSA(pkey,rsa);

    ret=ssl_set_pkey(ssl->cert,pkey);
    EVP_PKEY_free(pkey);
    return(ret);
    }
#endif

static int ssl_set_pkey(CERT *c, EVP_PKEY *pkey)
    {
    int i;

    i=ssl_cert_type(NULL,pkey);
    if (i < 0)
        {
        SSLerr(SSL_F_SSL_SET_PKEY,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
        return(0);
        }

    if (c->pkeys[i].x509 != NULL)
        {
        EVP_PKEY *pktmp;
        pktmp = X509_get_pubkey(c->pkeys[i].x509);
        EVP_PKEY_copy_parameters(pktmp,pkey);
        EVP_PKEY_free(pktmp);
        ERR_clear_error();

#ifndef OPENSSL_NO_RSA
        /* Don't check the public/private key, this is mostly
         * for smart cards. */
        if ((pkey->type == EVP_PKEY_RSA) &&
            (RSA_flags(pkey->pkey.rsa) & RSA_METHOD_FLAG_NO_CHECK))
            ;
        else
#endif
        if (!X509_check_private_key(c->pkeys[i].x509,pkey))
            {
            X509_free(c->pkeys[i].x509);
            c->pkeys[i].x509 = NULL;
            return 0;
            }
        }

    if (c->pkeys[i].privatekey != NULL)
        EVP_PKEY_free(c->pkeys[i].privatekey);
    CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
    c->pkeys[i].privatekey=pkey;
    c->key= &(c->pkeys[i]);

    c->valid=0;
    return(1);
    }

#ifndef OPENSSL_NO_RSA
#ifndef OPENSSL_NO_STDIO
int SSL_use_RSAPrivateKey_file(SSL *ssl, const char *file, int type)
    {
    int j,ret=0;
    BIO *in;
    RSA *rsa=NULL;

    in=BIO_new(BIO_s_file_internal());
    if (in == NULL)
        {
        SSLerr(SSL_F_SSL_USE_RSAPRIVATEKEY_FILE,ERR_R_BUF_LIB);
        goto end;
        }

    if (BIO_read_filename(in,file) <= 0)
        {
        SSLerr(SSL_F_SSL_USE_RSAPRIVATEKEY_FILE,ERR_R_SYS_LIB);
        goto end;
        }
    if  (type == SSL_FILETYPE_ASN1)
        {
        j=ERR_R_ASN1_LIB;
        rsa=d2i_RSAPrivateKey_bio(in,NULL);
        }
    else if (type == SSL_FILETYPE_PEM)
        {
        j=ERR_R_PEM_LIB;
        rsa=PEM_read_bio_RSAPrivateKey(in,NULL,
            ssl->ctx->default_passwd_callback,ssl->ctx->default_passwd_callback_userdata);
        }
    else
        {
        SSLerr(SSL_F_SSL_USE_RSAPRIVATEKEY_FILE,SSL_R_BAD_SSL_FILETYPE);
        goto end;
        }
    if (rsa == NULL)
        {
        SSLerr(SSL_F_SSL_USE_RSAPRIVATEKEY_FILE,j);
        goto end;
        }
    ret=SSL_use_RSAPrivateKey(ssl,rsa);
    RSA_free(rsa);
end:
    if (in != NULL) BIO_free(in);
    return(ret);
    }
#endif

int SSL_use_RSAPrivateKey_ASN1(SSL *ssl, unsigned char *d, long len)
    {
    int ret;
    const unsigned char *p;
    RSA *rsa;

    p=d;
    if ((rsa=d2i_RSAPrivateKey(NULL,&p,(long)len)) == NULL)
        {
        SSLerr(SSL_F_SSL_USE_RSAPRIVATEKEY_ASN1,ERR_R_ASN1_LIB);
        return(0);
        }

    ret=SSL_use_RSAPrivateKey(ssl,rsa);
    RSA_free(rsa);
    return(ret);
    }
#endif /* !OPENSSL_NO_RSA */

int SSL_use_PrivateKey(SSL *ssl, EVP_PKEY *pkey)
    {
    int ret;

    if (pkey == NULL)
        {
        SSLerr(SSL_F_SSL_USE_PRIVATEKEY,ERR_R_PASSED_NULL_PARAMETER);
        return(0);
        }
    if (!ssl_cert_inst(&ssl->cert))
        {
        SSLerr(SSL_F_SSL_USE_PRIVATEKEY,ERR_R_MALLOC_FAILURE);
        return(0);
        }
    ret=ssl_set_pkey(ssl->cert,pkey);
    return(ret);
    }

#ifndef OPENSSL_NO_STDIO
int SSL_use_PrivateKey_file(SSL *ssl, const char *file, int type)
    {
    int j,ret=0;
    BIO *in;
    EVP_PKEY *pkey=NULL;

    in=BIO_new(BIO_s_file_internal());
    if (in == NULL)
        {
        SSLerr(SSL_F_SSL_USE_PRIVATEKEY_FILE,ERR_R_BUF_LIB);
        goto end;
        }

    if (BIO_read_filename(in,file) <= 0)
        {
        SSLerr(SSL_F_SSL_USE_PRIVATEKEY_FILE,ERR_R_SYS_LIB);
        goto end;
        }
    if (type == SSL_FILETYPE_PEM)
        {
        j=ERR_R_PEM_LIB;
        pkey=PEM_read_bio_PrivateKey(in,NULL,
            ssl->ctx->default_passwd_callback,ssl->ctx->default_passwd_callback_userdata);
        }
    else if (type == SSL_FILETYPE_ASN1)
        {
        j = ERR_R_ASN1_LIB;
        pkey = d2i_PrivateKey_bio(in,NULL);
        }
    else
        {
        SSLerr(SSL_F_SSL_USE_PRIVATEKEY_FILE,SSL_R_BAD_SSL_FILETYPE);
        goto end;
        }
    if (pkey == NULL)
        {
        SSLerr(SSL_F_SSL_USE_PRIVATEKEY_FILE,j);
        goto end;
        }
    ret=SSL_use_PrivateKey(ssl,pkey);
    EVP_PKEY_free(pkey);
end:
    if (in != NULL) BIO_free(in);
    return(ret);
    }
#endif

int SSL_use_PrivateKey_ASN1(int type, SSL *ssl, const unsigned char *d, long len)
    {
    int ret;
    const unsigned char *p;
    EVP_PKEY *pkey;

    p=d;
    if ((pkey=d2i_PrivateKey(type,NULL,&p,(long)len)) == NULL)
        {
        SSLerr(SSL_F_SSL_USE_PRIVATEKEY_ASN1,ERR_R_ASN1_LIB);
        return(0);
        }

    ret=SSL_use_PrivateKey(ssl,pkey);
    EVP_PKEY_free(pkey);
    return(ret);
    }

int SSL_CTX_use_certificate(SSL_CTX *ctx, X509 *x)
    {
    if (x == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE,ERR_R_PASSED_NULL_PARAMETER);
        return(0);
        }
    if (!ssl_cert_inst(&ctx->cert))
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE,ERR_R_MALLOC_FAILURE);
        return(0);
        }
    return(ssl_set_cert(ctx->cert, x));
    }

static int ssl_set_cert(CERT *c, X509 *x)
    {
    EVP_PKEY *pkey;
    int i;

    pkey=X509_get_pubkey(x);
    if (pkey == NULL)
        {
        SSLerr(SSL_F_SSL_SET_CERT,SSL_R_X509_LIB);
        return(0);
        }

    i=ssl_cert_type(x,pkey);
    if (i < 0)
        {
        SSLerr(SSL_F_SSL_SET_CERT,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
        EVP_PKEY_free(pkey);
        return(0);
        }

    if (c->pkeys[i].privatekey != NULL)
        {
        EVP_PKEY_copy_parameters(pkey,c->pkeys[i].privatekey);
        ERR_clear_error();

#ifndef OPENSSL_NO_RSA
        /* Don't check the public/private key, this is mostly
         * for smart cards. */
        if ((c->pkeys[i].privatekey->type == EVP_PKEY_RSA) &&
            (RSA_flags(c->pkeys[i].privatekey->pkey.rsa) &
             RSA_METHOD_FLAG_NO_CHECK))
             ;
        else
#endif /* OPENSSL_NO_RSA */
        if (!X509_check_private_key(x,c->pkeys[i].privatekey))
            {
            /* don't fail for a cert/key mismatch, just free
             * current private key (when switching to a different
             * cert & key, first this function should be used,
             * then ssl_set_pkey */
            EVP_PKEY_free(c->pkeys[i].privatekey);
            c->pkeys[i].privatekey=NULL;
            /* clear error queue */
            ERR_clear_error();
            }
        }

    EVP_PKEY_free(pkey);

    if (c->pkeys[i].x509 != NULL)
        X509_free(c->pkeys[i].x509);
    CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
    c->pkeys[i].x509=x;
    c->key= &(c->pkeys[i]);

    c->valid=0;
    return(1);
    }

#ifndef OPENSSL_NO_STDIO
int SSL_CTX_use_certificate_file(SSL_CTX *ctx, const char *file, int type)
    {
    int j;
    BIO *in;
    int ret=0;
    X509 *x=NULL;

    in=BIO_new(BIO_s_file_internal());
    if (in == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,ERR_R_BUF_LIB);
        goto end;
        }

    if (BIO_read_filename(in,file) <= 0)
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,ERR_R_SYS_LIB);
        goto end;
        }
    if (type == SSL_FILETYPE_ASN1)
        {
        j=ERR_R_ASN1_LIB;
        x=d2i_X509_bio(in,NULL);
        }
    else if (type == SSL_FILETYPE_PEM)
        {
        j=ERR_R_PEM_LIB;
        x=PEM_read_bio_X509(in,NULL,ctx->default_passwd_callback,ctx->default_passwd_callback_userdata);
        }
    else
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,SSL_R_BAD_SSL_FILETYPE);
        goto end;
        }

    if (x == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,j);
        goto end;
        }

    ret=SSL_CTX_use_certificate(ctx,x);
end:
    if (x != NULL) X509_free(x);
    if (in != NULL) BIO_free(in);
    return(ret);
    }
#endif

int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, int len, const unsigned char *d)
    {
    X509 *x;
    int ret;

    x=d2i_X509(NULL,&d,(long)len);
    if (x == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_ASN1,ERR_R_ASN1_LIB);
        return(0);
        }

    ret=SSL_CTX_use_certificate(ctx,x);
    X509_free(x);
    return(ret);
    }

#ifndef OPENSSL_NO_RSA
int SSL_CTX_use_RSAPrivateKey(SSL_CTX *ctx, RSA *rsa)
    {
    int ret;
    EVP_PKEY *pkey;

    if (rsa == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY,ERR_R_PASSED_NULL_PARAMETER);
        return(0);
        }
    if (!ssl_cert_inst(&ctx->cert))
        {
        SSLerr(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY,ERR_R_MALLOC_FAILURE);
        return(0);
        }
    if ((pkey=EVP_PKEY_new()) == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY,ERR_R_EVP_LIB);
        return(0);
        }

    RSA_up_ref(rsa);
    EVP_PKEY_assign_RSA(pkey,rsa);

    ret=ssl_set_pkey(ctx->cert, pkey);
    EVP_PKEY_free(pkey);
    return(ret);
    }

#ifndef OPENSSL_NO_STDIO
int SSL_CTX_use_RSAPrivateKey_file(SSL_CTX *ctx, const char *file, int type)
    {
    int j,ret=0;
    BIO *in;
    RSA *rsa=NULL;

    in=BIO_new(BIO_s_file_internal());
    if (in == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY_FILE,ERR_R_BUF_LIB);
        goto end;
        }

    if (BIO_read_filename(in,file) <= 0)
        {
        SSLerr(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY_FILE,ERR_R_SYS_LIB);
        goto end;
        }
    if  (type == SSL_FILETYPE_ASN1)
        {
        j=ERR_R_ASN1_LIB;
        rsa=d2i_RSAPrivateKey_bio(in,NULL);
        }
    else if (type == SSL_FILETYPE_PEM)
        {
        j=ERR_R_PEM_LIB;
        rsa=PEM_read_bio_RSAPrivateKey(in,NULL,
            ctx->default_passwd_callback,ctx->default_passwd_callback_userdata);
        }
    else
        {
        SSLerr(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY_FILE,SSL_R_BAD_SSL_FILETYPE);
        goto end;
        }
    if (rsa == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY_FILE,j);
        goto end;
        }
    ret=SSL_CTX_use_RSAPrivateKey(ctx,rsa);
    RSA_free(rsa);
end:
    if (in != NULL) BIO_free(in);
    return(ret);
    }
#endif

int SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx, const unsigned char *d, long len)
    {
    int ret;
    const unsigned char *p;
    RSA *rsa;

    p=d;
    if ((rsa=d2i_RSAPrivateKey(NULL,&p,(long)len)) == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_RSAPRIVATEKEY_ASN1,ERR_R_ASN1_LIB);
        return(0);
        }

    ret=SSL_CTX_use_RSAPrivateKey(ctx,rsa);
    RSA_free(rsa);
    return(ret);
    }
#endif /* !OPENSSL_NO_RSA */

int SSL_CTX_use_PrivateKey(SSL_CTX *ctx, EVP_PKEY *pkey)
    {
    if (pkey == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_PRIVATEKEY,ERR_R_PASSED_NULL_PARAMETER);
        return(0);
        }
    if (!ssl_cert_inst(&ctx->cert))
        {
        SSLerr(SSL_F_SSL_CTX_USE_PRIVATEKEY,ERR_R_MALLOC_FAILURE);
        return(0);
        }
    return(ssl_set_pkey(ctx->cert,pkey));
    }

#ifndef OPENSSL_NO_STDIO
int SSL_CTX_use_PrivateKey_file(SSL_CTX *ctx, const char *file, int type)
    {
    int j,ret=0;
    BIO *in;
    EVP_PKEY *pkey=NULL;

    in=BIO_new(BIO_s_file_internal());
    if (in == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_PRIVATEKEY_FILE,ERR_R_BUF_LIB);
        goto end;
        }

    if (BIO_read_filename(in,file) <= 0)
        {
        SSLerr(SSL_F_SSL_CTX_USE_PRIVATEKEY_FILE,ERR_R_SYS_LIB);
        goto end;
        }
    if (type == SSL_FILETYPE_PEM)
        {
        j=ERR_R_PEM_LIB;
        pkey=PEM_read_bio_PrivateKey(in,NULL,
            ctx->default_passwd_callback,ctx->default_passwd_callback_userdata);
        }
    else if (type == SSL_FILETYPE_ASN1)
        {
        j = ERR_R_ASN1_LIB;
        pkey = d2i_PrivateKey_bio(in,NULL);
        }
    else
        {
        SSLerr(SSL_F_SSL_CTX_USE_PRIVATEKEY_FILE,SSL_R_BAD_SSL_FILETYPE);
        goto end;
        }
    if (pkey == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_PRIVATEKEY_FILE,j);
        goto end;
        }
    ret=SSL_CTX_use_PrivateKey(ctx,pkey);
    EVP_PKEY_free(pkey);
end:
    if (in != NULL) BIO_free(in);
    return(ret);
    }
#endif

int SSL_CTX_use_PrivateKey_ASN1(int type, SSL_CTX *ctx, const unsigned char *d,
         long len)
    {
    int ret;
    const unsigned char *p;
    EVP_PKEY *pkey;

    p=d;
    if ((pkey=d2i_PrivateKey(type,NULL,&p,(long)len)) == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_PRIVATEKEY_ASN1,ERR_R_ASN1_LIB);
        return(0);
        }

    ret=SSL_CTX_use_PrivateKey(ctx,pkey);
    EVP_PKEY_free(pkey);
    return(ret);
    }


#ifndef OPENSSL_NO_STDIO
/* Read a file that contains our certificate in "PEM" format,
 * possibly followed by a sequence of CA certificates that should be
 * sent to the peer in the Certificate message.
 */
int SSL_CTX_use_certificate_chain_file(SSL_CTX *ctx, const char *file)
    {
    BIO *in;
    int ret=0;
    X509 *x=NULL;

    ERR_clear_error(); /* clear error stack for SSL_CTX_use_certificate() */

    in=BIO_new(BIO_s_file_internal());
    if (in == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_CHAIN_FILE,ERR_R_BUF_LIB);
        goto end;
        }

    if (BIO_read_filename(in,file) <= 0)
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_CHAIN_FILE,ERR_R_SYS_LIB);
        goto end;
        }

    x=PEM_read_bio_X509_AUX(in,NULL,ctx->default_passwd_callback,ctx->default_passwd_callback_userdata);
    if (x == NULL)
        {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_CHAIN_FILE,ERR_R_PEM_LIB);
        goto end;
        }

    ret=SSL_CTX_use_certificate(ctx,x);
    if (ERR_peek_error() != 0)
        ret = 0;  /* Key/certificate mismatch doesn't imply ret==0 ... */
    if (ret)
        {
        /* If we could set up our certificate, now proceed to
         * the CA certificates.
         */
        X509 *ca;
        int r;
        unsigned long err;
        
        if (ctx->extra_certs != NULL) 
            {
            sk_X509_pop_free(ctx->extra_certs, X509_free);
            ctx->extra_certs = NULL;
            }

        while ((ca = PEM_read_bio_X509(in,NULL,ctx->default_passwd_callback,ctx->default_passwd_callback_userdata))
            != NULL)
            {
            r = SSL_CTX_add_extra_chain_cert(ctx, ca);
            if (!r) 
                {
                X509_free(ca);
                ret = 0;
                goto end;
                }
            /* Note that we must not free r if it was successfully
             * added to the chain (while we must free the main
             * certificate, since its reference count is increased
             * by SSL_CTX_use_certificate). */
            }
        /* When the while loop ends, it's usually just EOF. */
        err = ERR_peek_last_error();
        if (ERR_GET_LIB(err) == ERR_LIB_PEM && ERR_GET_REASON(err) == PEM_R_NO_START_LINE)
            ERR_clear_error();
        else 
            ret = 0; /* some real error */
        }

end:
    if (x != NULL) X509_free(x);
    if (in != NULL) BIO_free(in);
    return(ret);
    }
#endif