s_server.c

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/* apps/s_server.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * 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 (tjh@cryptsoft.com).
 * 
 * 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 (eay@cryptsoft.com)"
 *    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 (tjh@cryptsoft.com)"
 * 
 * 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.]
 */
/* ====================================================================
 * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
 *
 * 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 above 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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * ECC cipher suite support in OpenSSL originally developed by 
 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
 */

/* Until the key-gen callbacks are modified to use newer prototypes, we allow
 * deprecated functions for openssl-internal code */
#ifdef OPENSSL_NO_DEPRECATED
#undef OPENSSL_NO_DEPRECATED
#endif

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <sys/stat.h>
#include <openssl/e_os2.h>
#ifdef OPENSSL_NO_STDIO
#define APPS_WIN16
#endif

#if !defined(OPENSSL_SYS_NETWARE)  /* conflicts with winsock2 stuff on netware */
#include <sys/types.h>
#endif

/* With IPv6, it looks like Digital has mixed up the proper order of
   recursive header file inclusion, resulting in the compiler complaining
   that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which
   is needed to have fileno() declared correctly...  So let's define u_int */
#if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
#define __U_INT
typedef unsigned int u_int;
#endif

#include <openssl/lhash.h>
#include <openssl/bn.h>
#define USE_SOCKETS
#include "apps.h"
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
#include <openssl/ssl.h>
#include <openssl/rand.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif
#ifndef OPENSSL_NO_RSA
#include <openssl/rsa.h>
#endif
#include "s_apps.h"
#include "timeouts.h"

#ifdef OPENSSL_SYS_WINCE
/* Windows CE incorrectly defines fileno as returning void*, so to avoid problems below... */
#ifdef fileno
#undef fileno
#endif
#define fileno(a) (int)_fileno(a)
#endif

#if (defined(OPENSSL_SYS_VMS) && __VMS_VER < 70000000)
/* FIONBIO used as a switch to enable ioctl, and that isn't in VMS < 7.0 */
#undef FIONBIO
#endif

#ifndef OPENSSL_NO_RSA
static RSA MS_CALLBACK *tmp_rsa_cb(SSL *s, int is_export, int keylength);
#endif
static int sv_body(char *hostname, int s, unsigned char *context);
static int www_body(char *hostname, int s, unsigned char *context);
static void close_accept_socket(void );
static void sv_usage(void);
static int init_ssl_connection(SSL *s);
static void print_stats(BIO *bp,SSL_CTX *ctx);
static int generate_session_id(const SSL *ssl, unsigned char *id,
                                unsigned int *id_len);
#ifndef OPENSSL_NO_DH
static DH *load_dh_param(const char *dhfile);
static DH *get_dh512(void);
#endif

#ifdef MONOLITH
static void s_server_init(void);
#endif

#ifndef S_ISDIR
# if defined(_S_IFMT) && defined(_S_IFDIR)
#  define S_ISDIR(a)    (((a) & _S_IFMT) == _S_IFDIR)
# else
#  define S_ISDIR(a)    (((a) & S_IFMT) == S_IFDIR)
# endif
#endif

#ifndef OPENSSL_NO_DH
static unsigned char dh512_p[]={
        0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75,
        0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F,
        0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3,
        0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12,
        0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C,
        0x47,0x74,0xE8,0x33,
        };
static unsigned char dh512_g[]={
        0x02,
        };

static DH *get_dh512(void)
        {
        DH *dh=NULL;

        if ((dh=DH_new()) == NULL) return(NULL);
        dh->p=BN_bin2bn(dh512_p,sizeof(dh512_p),NULL);
        dh->g=BN_bin2bn(dh512_g,sizeof(dh512_g),NULL);
        if ((dh->p == NULL) || (dh->g == NULL))
                return(NULL);
        return(dh);
        }
#endif


/* static int load_CA(SSL_CTX *ctx, char *file);*/

#undef BUFSIZZ
#define BUFSIZZ 16*1024
static int bufsize=BUFSIZZ;
static int accept_socket= -1;

#define TEST_CERT       "server.pem"
#undef PROG
#define PROG            s_server_main

extern int verify_depth;

static char *cipher=NULL;
static int s_server_verify=SSL_VERIFY_NONE;
static int s_server_session_id_context = 1; /* anything will do */
static const char *s_cert_file=TEST_CERT,*s_key_file=NULL;
static char *s_dcert_file=NULL,*s_dkey_file=NULL;
#ifdef FIONBIO
static int s_nbio=0;
#endif
static int s_nbio_test=0;
int s_crlf=0;
static SSL_CTX *ctx=NULL;
static int www=0;

static BIO *bio_s_out=NULL;
static int s_debug=0;
static int s_msg=0;
static int s_quiet=0;

static int hack=0;
#ifndef OPENSSL_NO_ENGINE
static char *engine_id=NULL;
#endif
static const char *session_id_prefix=NULL;

static int enable_timeouts = 0;
#ifdef mtu
#undef mtu
#endif
static long mtu;
static int cert_chain = 0;


#ifdef MONOLITH
static void s_server_init(void)
        {
        accept_socket=-1;
        cipher=NULL;
        s_server_verify=SSL_VERIFY_NONE;
        s_dcert_file=NULL;
        s_dkey_file=NULL;
        s_cert_file=TEST_CERT;
        s_key_file=NULL;
#ifdef FIONBIO
        s_nbio=0;
#endif
        s_nbio_test=0;
        ctx=NULL;
        www=0;

        bio_s_out=NULL;
        s_debug=0;
        s_msg=0;
        s_quiet=0;
        hack=0;
#ifndef OPENSSL_NO_ENGINE
        engine_id=NULL;
#endif
        }
#endif

static void sv_usage(void)
        {
        BIO_printf(bio_err,"usage: s_server [args ...]\n");
        BIO_printf(bio_err,"\n");
        BIO_printf(bio_err," -accept arg   - port to accept on (default is %d)\n",PORT);
        BIO_printf(bio_err," -context arg  - set session ID context\n");
        BIO_printf(bio_err," -verify arg   - turn on peer certificate verification\n");
        BIO_printf(bio_err," -Verify arg   - turn on peer certificate verification, must have a cert.\n");
        BIO_printf(bio_err," -cert arg     - certificate file to use\n");
        BIO_printf(bio_err,"                 (default is %s)\n",TEST_CERT);
        BIO_printf(bio_err," -certform arg - certificate format (PEM or DER) PEM default\n");
        BIO_printf(bio_err," -key arg      - Private Key file to use, in cert file if\n");
        BIO_printf(bio_err,"                 not specified (default is %s)\n",TEST_CERT);
        BIO_printf(bio_err," -keyform arg  - key format (PEM, DER or ENGINE) PEM default\n");
        BIO_printf(bio_err," -pass arg     - private key file pass phrase source\n");
        BIO_printf(bio_err," -dcert arg    - second certificate file to use (usually for DSA)\n");
        BIO_printf(bio_err," -dcertform x  - second certificate format (PEM or DER) PEM default\n");
        BIO_printf(bio_err," -dkey arg     - second private key file to use (usually for DSA)\n");
        BIO_printf(bio_err," -dkeyform arg - second key format (PEM, DER or ENGINE) PEM default\n");
        BIO_printf(bio_err," -dpass arg    - second private key file pass phrase source\n");
        BIO_printf(bio_err," -dhparam arg  - DH parameter file to use, in cert file if not specified\n");
        BIO_printf(bio_err,"                 or a default set of parameters is used\n");
#ifndef OPENSSL_NO_ECDH
        BIO_printf(bio_err," -named_curve arg  - Elliptic curve name to use for ephemeral ECDH keys.\n" \
                           "                 Use \"openssl ecparam -list_curves\" for all names\n" \
                           "                 (default is sect163r2).\n");
#endif
#ifdef FIONBIO
        BIO_printf(bio_err," -nbio         - Run with non-blocking IO\n");
#endif
        BIO_printf(bio_err," -nbio_test    - test with the non-blocking test bio\n");
        BIO_printf(bio_err," -crlf         - convert LF from terminal into CRLF\n");
        BIO_printf(bio_err," -debug        - Print more output\n");
        BIO_printf(bio_err," -msg          - Show protocol messages\n");
        BIO_printf(bio_err," -state        - Print the SSL states\n");
        BIO_printf(bio_err," -CApath arg   - PEM format directory of CA's\n");
        BIO_printf(bio_err," -CAfile arg   - PEM format file of CA's\n");
        BIO_printf(bio_err," -nocert       - Don't use any certificates (Anon-DH)\n");
        BIO_printf(bio_err," -cipher arg   - play with 'openssl ciphers' to see what goes here\n");
        BIO_printf(bio_err," -serverpref   - Use server's cipher preferences\n");
        BIO_printf(bio_err," -quiet        - No server output\n");
        BIO_printf(bio_err," -no_tmp_rsa   - Do not generate a tmp RSA key\n");
        BIO_printf(bio_err," -ssl2         - Just talk SSLv2\n");
        BIO_printf(bio_err," -ssl3         - Just talk SSLv3\n");
        BIO_printf(bio_err," -tls1         - Just talk TLSv1\n");
        BIO_printf(bio_err," -dtls1        - Just talk DTLSv1\n");
        BIO_printf(bio_err," -timeout      - Enable timeouts\n");
        BIO_printf(bio_err," -mtu          - Set MTU\n");
        BIO_printf(bio_err," -chain        - Read a certificate chain\n");
        BIO_printf(bio_err," -no_ssl2      - Just disable SSLv2\n");
        BIO_printf(bio_err," -no_ssl3      - Just disable SSLv3\n");
        BIO_printf(bio_err," -no_tls1      - Just disable TLSv1\n");
#ifndef OPENSSL_NO_DH
        BIO_printf(bio_err," -no_dhe       - Disable ephemeral DH\n");
#endif
#ifndef OPENSSL_NO_ECDH
        BIO_printf(bio_err," -no_ecdhe     - Disable ephemeral ECDH\n");
#endif
        BIO_printf(bio_err," -bugs         - Turn on SSL bug compatibility\n");
        BIO_printf(bio_err," -www          - Respond to a 'GET /' with a status page\n");
        BIO_printf(bio_err," -WWW          - Respond to a 'GET /<path> HTTP/1.0' with file ./<path>\n");
        BIO_printf(bio_err," -HTTP         - Respond to a 'GET /<path> HTTP/1.0' with file ./<path>\n");
        BIO_printf(bio_err,"                 with the assumption it contains a complete HTTP response.\n");
#ifndef OPENSSL_NO_ENGINE
        BIO_printf(bio_err," -engine id    - Initialise and use the specified engine\n");
#endif
        BIO_printf(bio_err," -id_prefix arg - Generate SSL/TLS session IDs prefixed by 'arg'\n");
        BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
        }

static int local_argc=0;
static char **local_argv;

#ifdef CHARSET_EBCDIC
static int ebcdic_new(BIO *bi);
static int ebcdic_free(BIO *a);
static int ebcdic_read(BIO *b, char *out, int outl);
static int ebcdic_write(BIO *b, const char *in, int inl);
static long ebcdic_ctrl(BIO *b, int cmd, long num, void *ptr);
static int ebcdic_gets(BIO *bp, char *buf, int size);
static int ebcdic_puts(BIO *bp, const char *str);

#define BIO_TYPE_EBCDIC_FILTER  (18|0x0200)
static BIO_METHOD methods_ebcdic=
        {
        BIO_TYPE_EBCDIC_FILTER,
        "EBCDIC/ASCII filter",
        ebcdic_write,
        ebcdic_read,
        ebcdic_puts,
        ebcdic_gets,
        ebcdic_ctrl,
        ebcdic_new,
        ebcdic_free,
        };

typedef struct
{
        size_t  alloced;
        char    buff[1];
} EBCDIC_OUTBUFF;

BIO_METHOD *BIO_f_ebcdic_filter()
{
        return(&methods_ebcdic);
}

static int ebcdic_new(BIO *bi)
{
        EBCDIC_OUTBUFF *wbuf;

        wbuf = (EBCDIC_OUTBUFF *)OPENSSL_malloc(sizeof(EBCDIC_OUTBUFF) + 1024);
        wbuf->alloced = 1024;
        wbuf->buff[0] = '\0';

        bi->ptr=(char *)wbuf;
        bi->init=1;
        bi->flags=0;
        return(1);
}

static int ebcdic_free(BIO *a)
{
        if (a == NULL) return(0);
        if (a->ptr != NULL)
                OPENSSL_free(a->ptr);
        a->ptr=NULL;
        a->init=0;
        a->flags=0;
        return(1);
}
        
static int ebcdic_read(BIO *b, char *out, int outl)
{
        int ret=0;

        if (out == NULL || outl == 0) return(0);
        if (b->next_bio == NULL) return(0);

        ret=BIO_read(b->next_bio,out,outl);
        if (ret > 0)
                ascii2ebcdic(out,out,ret);
        return(ret);
}

static int ebcdic_write(BIO *b, const char *in, int inl)
{
        EBCDIC_OUTBUFF *wbuf;
        int ret=0;
        int num;
        unsigned char n;

        if ((in == NULL) || (inl <= 0)) return(0);
        if (b->next_bio == NULL) return(0);

        wbuf=(EBCDIC_OUTBUFF *)b->ptr;

        if (inl > (num = wbuf->alloced))
        {
                num = num + num;  /* double the size */
                if (num < inl)
                        num = inl;
                OPENSSL_free(wbuf);
                wbuf=(EBCDIC_OUTBUFF *)OPENSSL_malloc(sizeof(EBCDIC_OUTBUFF) + num);

                wbuf->alloced = num;
                wbuf->buff[0] = '\0';

                b->ptr=(char *)wbuf;
        }

        ebcdic2ascii(wbuf->buff, in, inl);

        ret=BIO_write(b->next_bio, wbuf->buff, inl);

        return(ret);
}

static long ebcdic_ctrl(BIO *b, int cmd, long num, void *ptr)
{
        long ret;

        if (b->next_bio == NULL) return(0);
        switch (cmd)
        {
        case BIO_CTRL_DUP:
                ret=0L;
                break;
        default:
                ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
                break;
        }
        return(ret);
}

static int ebcdic_gets(BIO *bp, char *buf, int size)
{
        int i, ret=0;
        if (bp->next_bio == NULL) return(0);
/*      return(BIO_gets(bp->next_bio,buf,size));*/
        for (i=0; i<size-1; ++i)
        {
                ret = ebcdic_read(bp,&buf[i],1);
                if (ret <= 0)
                        break;
                else if (buf[i] == '\n')
                {
                        ++i;
                        break;
                }
        }
        if (i < size)
                buf[i] = '\0';
        return (ret < 0 && i == 0) ? ret : i;
}

static int ebcdic_puts(BIO *bp, const char *str)
{
        if (bp->next_bio == NULL) return(0);
        return ebcdic_write(bp, str, strlen(str));
}
#endif

int MAIN(int, char **);

int MAIN(int argc, char *argv[])
        {
        X509_STORE *store = NULL;
        int vflags = 0;
        short port=PORT;
        char *CApath=NULL,*CAfile=NULL;
        unsigned char *context = NULL;
        char *dhfile = NULL;
#ifndef OPENSSL_NO_ECDH
        char *named_curve = NULL;
#endif
        int badop=0,bugs=0;
        int ret=1;
        int off=0;
        int no_tmp_rsa=0,no_dhe=0,no_ecdhe=0,nocert=0;
        int state=0;
        SSL_METHOD *meth=NULL;
#ifdef sock_type
#undef sock_type
#endif
    int sock_type=SOCK_STREAM;
#ifndef OPENSSL_NO_ENGINE
        ENGINE *e=NULL;
#endif
        char *inrand=NULL;
        int s_cert_format = FORMAT_PEM, s_key_format = FORMAT_PEM;
        char *passarg = NULL, *pass = NULL;
        char *dpassarg = NULL, *dpass = NULL;
        int s_dcert_format = FORMAT_PEM, s_dkey_format = FORMAT_PEM;
        X509 *s_cert = NULL, *s_dcert = NULL;
        EVP_PKEY *s_key = NULL, *s_dkey = NULL;

#if !defined(OPENSSL_NO_SSL2) && !defined(OPENSSL_NO_SSL3)
        meth=SSLv23_server_method();
#elif !defined(OPENSSL_NO_SSL3)
        meth=SSLv3_server_method();
#elif !defined(OPENSSL_NO_SSL2)
        meth=SSLv2_server_method();
#endif

        local_argc=argc;
        local_argv=argv;

        apps_startup();
#ifdef MONOLITH
        s_server_init();
#endif

        if (bio_err == NULL)
                bio_err=BIO_new_fp(stderr,BIO_NOCLOSE);

        if (!load_config(bio_err, NULL))
                goto end;

        verify_depth=0;
#ifdef FIONBIO
        s_nbio=0;
#endif
        s_nbio_test=0;

        argc--;
        argv++;

        while (argc >= 1)
                {
                if      ((strcmp(*argv,"-port") == 0) ||
                         (strcmp(*argv,"-accept") == 0))
                        {
                        if (--argc < 1) goto bad;
                        if (!extract_port(*(++argv),&port))
                                goto bad;
                        }
                else if (strcmp(*argv,"-verify") == 0)
                        {
                        s_server_verify=SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE;
                        if (--argc < 1) goto bad;
                        verify_depth=atoi(*(++argv));
                        BIO_printf(bio_err,"verify depth is %d\n",verify_depth);
                        }
                else if (strcmp(*argv,"-Verify") == 0)
                        {
                        s_server_verify=SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT|
                                SSL_VERIFY_CLIENT_ONCE;
                        if (--argc < 1) goto bad;
                        verify_depth=atoi(*(++argv));
                        BIO_printf(bio_err,"verify depth is %d, must return a certificate\n",verify_depth);
                        }
                else if (strcmp(*argv,"-context") == 0)
                        {
                        if (--argc < 1) goto bad;
                        context= (unsigned char *)*(++argv);
                        }
                else if (strcmp(*argv,"-cert") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_cert_file= *(++argv);
                        }
                else if (strcmp(*argv,"-certform") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_cert_format = str2fmt(*(++argv));
                        }
                else if (strcmp(*argv,"-key") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_key_file= *(++argv);
                        }
                else if (strcmp(*argv,"-keyform") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_key_format = str2fmt(*(++argv));
                        }
                else if (strcmp(*argv,"-pass") == 0)
                        {
                        if (--argc < 1) goto bad;
                        passarg = *(++argv);
                        }
                else if (strcmp(*argv,"-dhparam") == 0)
                        {
                        if (--argc < 1) goto bad;
                        dhfile = *(++argv);
                        }
#ifndef OPENSSL_NO_ECDH         
                else if (strcmp(*argv,"-named_curve") == 0)
                        {
                        if (--argc < 1) goto bad;
                        named_curve = *(++argv);
                        }
#endif
                else if (strcmp(*argv,"-dcertform") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_dcert_format = str2fmt(*(++argv));
                        }
                else if (strcmp(*argv,"-dcert") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_dcert_file= *(++argv);
                        }
                else if (strcmp(*argv,"-dkeyform") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_dkey_format = str2fmt(*(++argv));
                        }
                else if (strcmp(*argv,"-dpass") == 0)
                        {
                        if (--argc < 1) goto bad;
                        dpassarg = *(++argv);
                        }
                else if (strcmp(*argv,"-dkey") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_dkey_file= *(++argv);
                        }
                else if (strcmp(*argv,"-nocert") == 0)
                        {
                        nocert=1;
                        }
                else if (strcmp(*argv,"-CApath") == 0)
                        {
                        if (--argc < 1) goto bad;
                        CApath= *(++argv);
                        }
                else if (strcmp(*argv,"-crl_check") == 0)
                        {
                        vflags |= X509_V_FLAG_CRL_CHECK;
                        }
                else if (strcmp(*argv,"-crl_check") == 0)
                        {
                        vflags |= X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL;
                        }
                else if (strcmp(*argv,"-serverpref") == 0)
                        { off|=SSL_OP_CIPHER_SERVER_PREFERENCE; }
                else if (strcmp(*argv,"-cipher") == 0)
                        {
                        if (--argc < 1) goto bad;
                        cipher= *(++argv);
                        }
                else if (strcmp(*argv,"-CAfile") == 0)
                        {
                        if (--argc < 1) goto bad;
                        CAfile= *(++argv);
                        }
#ifdef FIONBIO  
                else if (strcmp(*argv,"-nbio") == 0)
                        { s_nbio=1; }
#endif
                else if (strcmp(*argv,"-nbio_test") == 0)
                        {
#ifdef FIONBIO  
                        s_nbio=1;
#endif
                        s_nbio_test=1;
                        }
                else if (strcmp(*argv,"-debug") == 0)
                        { s_debug=1; }
                else if (strcmp(*argv,"-msg") == 0)
                        { s_msg=1; }
                else if (strcmp(*argv,"-hack") == 0)
                        { hack=1; }
                else if (strcmp(*argv,"-state") == 0)
                        { state=1; }
                else if (strcmp(*argv,"-crlf") == 0)
                        { s_crlf=1; }
                else if (strcmp(*argv,"-quiet") == 0)
                        { s_quiet=1; }
                else if (strcmp(*argv,"-bugs") == 0)
                        { bugs=1; }
                else if (strcmp(*argv,"-no_tmp_rsa") == 0)
                        { no_tmp_rsa=1; }
                else if (strcmp(*argv,"-no_dhe") == 0)
                        { no_dhe=1; }
                else if (strcmp(*argv,"-no_ecdhe") == 0)
                        { no_ecdhe=1; }
                else if (strcmp(*argv,"-www") == 0)
                        { www=1; }
                else if (strcmp(*argv,"-WWW") == 0)
                        { www=2; }
                else if (strcmp(*argv,"-HTTP") == 0)
                        { www=3; }
                else if (strcmp(*argv,"-no_ssl2") == 0)
                        { off|=SSL_OP_NO_SSLv2; }
                else if (strcmp(*argv,"-no_ssl3") == 0)
                        { off|=SSL_OP_NO_SSLv3; }
                else if (strcmp(*argv,"-no_tls1") == 0)
                        { off|=SSL_OP_NO_TLSv1; }
#ifndef OPENSSL_NO_SSL2
                else if (strcmp(*argv,"-ssl2") == 0)
                        { meth=SSLv2_server_method(); }
#endif
#ifndef OPENSSL_NO_SSL3
                else if (strcmp(*argv,"-ssl3") == 0)
                        { meth=SSLv3_server_method(); }
#endif
#ifndef OPENSSL_NO_TLS1
                else if (strcmp(*argv,"-tls1") == 0)
                        { meth=TLSv1_server_method(); }
#endif
#ifndef OPENSSL_NO_DTLS1
                else if (strcmp(*argv,"-dtls1") == 0)
                        { 
                        meth=DTLSv1_server_method();
                        sock_type = SOCK_DGRAM;
                        }
                else if (strcmp(*argv,"-timeout") == 0)
                        enable_timeouts = 1;
                else if (strcmp(*argv,"-mtu") == 0)
                        {
                        if (--argc < 1) goto bad;
                        mtu = atol(*(++argv));
                        }
                else if (strcmp(*argv, "-chain") == 0)
                        cert_chain = 1;
#endif
                else if (strcmp(*argv, "-id_prefix") == 0)
                        {
                        if (--argc < 1) goto bad;
                        session_id_prefix = *(++argv);
                        }
#ifndef OPENSSL_NO_ENGINE
                else if (strcmp(*argv,"-engine") == 0)
                        {
                        if (--argc < 1) goto bad;
                        engine_id= *(++argv);
                        }
#endif
                else if (strcmp(*argv,"-rand") == 0)
                        {
                        if (--argc < 1) goto bad;
                        inrand= *(++argv);
                        }
                else
                        {
                        BIO_printf(bio_err,"unknown option %s\n",*argv);
                        badop=1;
                        break;
                        }
                argc--;
                argv++;
                }
        if (badop)
                {
bad:
                sv_usage();
                goto end;
                }

        SSL_load_error_strings();
        OpenSSL_add_ssl_algorithms();

#ifndef OPENSSL_NO_ENGINE
        e = setup_engine(bio_err, engine_id, 1);
#endif

        if (!app_passwd(bio_err, passarg, dpassarg, &pass, &dpass))
                {
                BIO_printf(bio_err, "Error getting password\n");
                goto end;
                }


        if (s_key_file == NULL)
                s_key_file = s_cert_file;

        if (nocert == 0)
                {
                s_key = load_key(bio_err, s_key_file, s_key_format, 0, pass, e,
                       "server certificate private key file");
                if (!s_key)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }

                s_cert = load_cert(bio_err,s_cert_file,s_cert_format,
                        NULL, e, "server certificate file");

                if (!s_cert)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                }

        if (s_dcert_file)
                {

                if (s_dkey_file == NULL)
                        s_dkey_file = s_dcert_file;

                s_dkey = load_key(bio_err, s_dkey_file, s_dkey_format,
                                0, dpass, e,
                               "second certificate private key file");
                if (!s_dkey)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }

                s_dcert = load_cert(bio_err,s_dcert_file,s_dcert_format,
                                NULL, e, "second server certificate file");

                if (!s_dcert)
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }

                }

        if (!app_RAND_load_file(NULL, bio_err, 1) && inrand == NULL
                && !RAND_status())
                {
                BIO_printf(bio_err,"warning, not much extra random data, consider using the -rand option\n");
                }
        if (inrand != NULL)
                BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
                        app_RAND_load_files(inrand));

        if (bio_s_out == NULL)
                {
                if (s_quiet && !s_debug && !s_msg)
                        {
                        bio_s_out=BIO_new(BIO_s_null());
                        }
                else
                        {
                        if (bio_s_out == NULL)
                                bio_s_out=BIO_new_fp(stdout,BIO_NOCLOSE);
                        }
                }

#if !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
        if (nocert)
#endif
                {
                s_cert_file=NULL;
                s_key_file=NULL;
                s_dcert_file=NULL;
                s_dkey_file=NULL;
                }

        ctx=SSL_CTX_new(meth);
        if (ctx == NULL)
                {
                ERR_print_errors(bio_err);
                goto end;
                }
        if (session_id_prefix)
                {
                if(strlen(session_id_prefix) >= 32)
                        BIO_printf(bio_err,
"warning: id_prefix is too long, only one new session will be possible\n");
                else if(strlen(session_id_prefix) >= 16)
                        BIO_printf(bio_err,
"warning: id_prefix is too long if you use SSLv2\n");
                if(!SSL_CTX_set_generate_session_id(ctx, generate_session_id))
                        {
                        BIO_printf(bio_err,"error setting 'id_prefix'\n");
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                BIO_printf(bio_err,"id_prefix '%s' set.\n", session_id_prefix);
                }
        SSL_CTX_set_quiet_shutdown(ctx,1);
        if (bugs) SSL_CTX_set_options(ctx,SSL_OP_ALL);
        if (hack) SSL_CTX_set_options(ctx,SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG);
        SSL_CTX_set_options(ctx,off);
        /* DTLS: partial reads end up discarding unread UDP bytes :-( 
         * Setting read ahead solves this problem.
         */
        if (sock_type == SOCK_DGRAM) SSL_CTX_set_read_ahead(ctx, 1);

        if (state) SSL_CTX_set_info_callback(ctx,apps_ssl_info_callback);

        SSL_CTX_sess_set_cache_size(ctx,128);

#if 0
        if (cipher == NULL) cipher=getenv("SSL_CIPHER");
#endif

#if 0
        if (s_cert_file == NULL)
                {
                BIO_printf(bio_err,"You must specify a certificate file for the server to use\n");
                goto end;
                }
#endif

        if ((!SSL_CTX_load_verify_locations(ctx,CAfile,CApath)) ||
                (!SSL_CTX_set_default_verify_paths(ctx)))
                {
                /* BIO_printf(bio_err,"X509_load_verify_locations\n"); */
                ERR_print_errors(bio_err);
                /* goto end; */
                }
        store = SSL_CTX_get_cert_store(ctx);
        X509_STORE_set_flags(store, vflags);

#ifndef OPENSSL_NO_DH
        if (!no_dhe)
                {
                DH *dh=NULL;

                if (dhfile)
                        dh = load_dh_param(dhfile);
                else if (s_cert_file)
                        dh = load_dh_param(s_cert_file);

                if (dh != NULL)
                        {
                        BIO_printf(bio_s_out,"Setting temp DH parameters\n");
                        }
                else
                        {
                        BIO_printf(bio_s_out,"Using default temp DH parameters\n");
                        dh=get_dh512();
                        }
                (void)BIO_flush(bio_s_out);

                SSL_CTX_set_tmp_dh(ctx,dh);
                DH_free(dh);
                }
#endif

#ifndef OPENSSL_NO_ECDH
        if (!no_ecdhe)
                {
                EC_KEY *ecdh=NULL;

                if (named_curve)
                        {
                        int nid = OBJ_sn2nid(named_curve);

                        if (nid == 0)
                                {
                                BIO_printf(bio_err, "unknown curve name (%s)\n", 
                                        named_curve);
                                goto end;
                                }
                        ecdh = EC_KEY_new_by_curve_name(nid);
                        if (ecdh == NULL)
                                {
                                BIO_printf(bio_err, "unable to create curve (%s)\n", 
                                        named_curve);
                                goto end;
                                }
                        }

                if (ecdh != NULL)
                        {
                        BIO_printf(bio_s_out,"Setting temp ECDH parameters\n");
                        }
                else
                        {
                        BIO_printf(bio_s_out,"Using default temp ECDH parameters\n");
                        ecdh = EC_KEY_new_by_curve_name(NID_sect163r2);
                        if (ecdh == NULL) 
                                {
                                BIO_printf(bio_err, "unable to create curve (sect163r2)\n");
                                goto end;
                                }
                        }
                (void)BIO_flush(bio_s_out);

                SSL_CTX_set_tmp_ecdh(ctx,ecdh);
                EC_KEY_free(ecdh);
                }
#endif
        
        if (!set_cert_key_stuff(ctx,s_cert,s_key))
                goto end;
        if (s_dcert != NULL)
                {
                if (!set_cert_key_stuff(ctx,s_dcert,s_dkey))
                        goto end;
                }

#ifndef OPENSSL_NO_RSA
#if 1
        if (!no_tmp_rsa)
                SSL_CTX_set_tmp_rsa_callback(ctx,tmp_rsa_cb);
#else
        if (!no_tmp_rsa && SSL_CTX_need_tmp_RSA(ctx))
                {
                RSA *rsa;

                BIO_printf(bio_s_out,"Generating temp (512 bit) RSA key...");
                BIO_flush(bio_s_out);

                rsa=RSA_generate_key(512,RSA_F4,NULL);

                if (!SSL_CTX_set_tmp_rsa(ctx,rsa))
                        {
                        ERR_print_errors(bio_err);
                        goto end;
                        }
                RSA_free(rsa);
                BIO_printf(bio_s_out,"\n");
                }
#endif
#endif

        if (cipher != NULL)
                if(!SSL_CTX_set_cipher_list(ctx,cipher)) {
                BIO_printf(bio_err,"error setting cipher list\n");
                ERR_print_errors(bio_err);
                goto end;
        }
        SSL_CTX_set_verify(ctx,s_server_verify,verify_callback);
        SSL_CTX_set_session_id_context(ctx,(void*)&s_server_session_id_context,
                sizeof s_server_session_id_context);

        if (CAfile != NULL)
            SSL_CTX_set_client_CA_list(ctx,SSL_load_client_CA_file(CAfile));

        BIO_printf(bio_s_out,"ACCEPT\n");
        if (www)
                do_server(port,sock_type,&accept_socket,www_body,