ssl_lib.c

/*! \file ssl/ssl_lib.c
 *  \brief Version independent SSL functions.
 */
/* 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.]
 */

#include <stdio.h>
#include <openssl/objects.h>
#include <openssl/lhash.h>
#include "ssl_locl.h"

char *SSL_version_str=OPENSSL_VERSION_TEXT;

static STACK *ssl_meth=NULL;
static STACK *ssl_ctx_meth=NULL;
static int ssl_meth_num=0;
static int ssl_ctx_meth_num=0;

SSL3_ENC_METHOD ssl3_undef_enc_method={
	ssl_undefined_function,
	ssl_undefined_function,
	ssl_undefined_function,
	ssl_undefined_function,
	ssl_undefined_function,
	ssl_undefined_function,
	};

int SSL_clear(SSL *s)
	{
	int state;

	if (s->method == NULL)
		{
		SSLerr(SSL_F_SSL_CLEAR,SSL_R_NO_METHOD_SPECIFIED);
		return(0);
		}

	s->error=0;
	s->hit=0;
	s->shutdown=0;

#if 0
	/* This is set if we are doing dynamic renegotiation so keep
	 * the old cipher.  It is sort of a SSL_clear_lite :-) */
	if (s->new_session) return(1);
#endif

	state=s->state; /* Keep to check if we throw away the session-id */
	s->type=0;

	s->state=SSL_ST_BEFORE|((s->server)?SSL_ST_ACCEPT:SSL_ST_CONNECT);

	s->version=s->method->version;
	s->client_version=s->version;
	s->rwstate=SSL_NOTHING;
	s->rstate=SSL_ST_READ_HEADER;
	s->read_ahead=s->ctx->read_ahead;

	if (s->init_buf != NULL)
		{
		BUF_MEM_free(s->init_buf);
		s->init_buf=NULL;
		}

	ssl_clear_cipher_ctx(s);

	if (ssl_clear_bad_session(s))
		{
		SSL_SESSION_free(s->session);
		s->session=NULL;
		}

	s->first_packet=0;

#if 1
	/* Check to see if we were changed into a different method, if
	 * so, revert back if we are not doing session-id reuse. */
	if ((s->session == NULL) && (s->method != s->ctx->method))
		{
		s->method->ssl_free(s);
		s->method=s->ctx->method;
		if (!s->method->ssl_new(s))
			return(0);
		}
	else
#endif
		s->method->ssl_clear(s);
	return(1);
	}

/** Used to change an SSL_CTXs default SSL method type */
int SSL_CTX_set_ssl_version(SSL_CTX *ctx,SSL_METHOD *meth)
	{
	STACK_OF(SSL_CIPHER) *sk;

	ctx->method=meth;

	sk=ssl_create_cipher_list(ctx->method,&(ctx->cipher_list),
		&(ctx->cipher_list_by_id),SSL_DEFAULT_CIPHER_LIST);
	if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= 0))
		{
		SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION,SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
		return(0);
		}
	return(1);
	}

SSL *SSL_new(SSL_CTX *ctx)
	{
	SSL *s;

	if (ctx == NULL)
		{
		SSLerr(SSL_F_SSL_NEW,SSL_R_NULL_SSL_CTX);
		return(NULL);
		}
	if (ctx->method == NULL)
		{
		SSLerr(SSL_F_SSL_NEW,SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION);
		return(NULL);
		}

	s=(SSL *)Malloc(sizeof(SSL));
	if (s == NULL) goto err;
	memset(s,0,sizeof(SSL));

	if (ctx->default_cert != NULL)
		{
		CRYPTO_add(&ctx->default_cert->references,1,
			   CRYPTO_LOCK_SSL_CERT);
		s->cert=ctx->default_cert;
		}
	else
		s->cert=NULL;
	s->sid_ctx_length=ctx->sid_ctx_length;
	memcpy(&s->sid_ctx,&ctx->sid_ctx,sizeof(s->sid_ctx));
	s->verify_mode=ctx->verify_mode;
	s->verify_depth=ctx->verify_depth;
	s->verify_callback=ctx->default_verify_callback;
	CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
	s->ctx=ctx;

	s->verify_result=X509_V_OK;

	s->method=ctx->method;

	if (!s->method->ssl_new(s))
		{
		SSL_CTX_free(ctx);
		Free(s);
		goto err;
		}

	s->quiet_shutdown=ctx->quiet_shutdown;
	s->references=1;
	s->server=(ctx->method->ssl_accept == ssl_undefined_function)?0:1;
	s->options=ctx->options;
	SSL_clear(s);

	CRYPTO_new_ex_data(ssl_meth,(char *)s,&s->ex_data);

	return(s);
err:
	SSLerr(SSL_F_SSL_NEW,ERR_R_MALLOC_FAILURE);
	return(NULL);
	}

int SSL_CTX_set_session_id_context(SSL_CTX *ctx,const unsigned char *sid_ctx,
				   unsigned int sid_ctx_len)
    {
    if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH)
	{
	SSLerr(SSL_F_SSL_CTX_SET_SESSION_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
	return 0;
	}
    ctx->sid_ctx_length=sid_ctx_len;
    memcpy(ctx->sid_ctx,sid_ctx,sid_ctx_len);

    return 1;
    }

int SSL_set_session_id_context(SSL *ssl,const unsigned char *sid_ctx,
			       unsigned int sid_ctx_len)
    {
    if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH)
	{
	SSLerr(SSL_F_SSL_SET_SESSION_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
	return 0;
	}
    ssl->sid_ctx_length=sid_ctx_len;
    memcpy(ssl->sid_ctx,sid_ctx,sid_ctx_len);

    return 1;
    }

void SSL_free(SSL *s)
	{
	int i;

	if(s == NULL)
	    return;

	i=CRYPTO_add(&s->references,-1,CRYPTO_LOCK_SSL);
#ifdef REF_PRINT
	REF_PRINT("SSL",s);
#endif
	if (i > 0) return;
#ifdef REF_CHECK
	if (i < 0)
		{
		fprintf(stderr,"SSL_free, bad reference count\n");
		abort(); /* ok */
		}
#endif

	CRYPTO_free_ex_data(ssl_meth,(char *)s,&s->ex_data);

	if (s->bbio != NULL)
		{
		/* If the buffering BIO is in place, pop it off */
		if (s->bbio == s->wbio)
			{
			s->wbio=BIO_pop(s->wbio);
			}
		BIO_free(s->bbio);
		s->bbio=NULL;
		}
	if (s->rbio != NULL)
		BIO_free_all(s->rbio);
	if ((s->wbio != NULL) && (s->wbio != s->rbio))
		BIO_free_all(s->wbio);

	if (s->init_buf != NULL) BUF_MEM_free(s->init_buf);

	/* add extra stuff */
	if (s->cipher_list != NULL) sk_SSL_CIPHER_free(s->cipher_list);
	if (s->cipher_list_by_id != NULL) sk_SSL_CIPHER_free(s->cipher_list_by_id);

	/* Make the next call work :-) */
	if (s->session != NULL)
		{
		ssl_clear_bad_session(s);
		SSL_SESSION_free(s->session);
		}

	ssl_clear_cipher_ctx(s);

	if (s->cert != NULL) ssl_cert_free(s->cert);
	/* Free up if allocated */

	if (s->ctx) SSL_CTX_free(s->ctx);

	if (s->client_CA != NULL)
		sk_X509_NAME_pop_free(s->client_CA,X509_NAME_free);

	if (s->method != NULL) s->method->ssl_free(s);

	Free((char *)s);
	}

void SSL_set_bio(SSL *s,BIO *rbio,BIO *wbio)
	{
	/* If the output buffering BIO is still in place, remove it
	 */
	if (s->bbio != NULL)
		{
		if (s->wbio == s->bbio)
			{
			s->wbio=s->wbio->next_bio;
			s->bbio->next_bio=NULL;
			}
		}
	if ((s->rbio != NULL) && (s->rbio != rbio))
		BIO_free_all(s->rbio);
	if ((s->wbio != NULL) && (s->wbio != wbio) && (s->rbio != s->wbio))
		BIO_free_all(s->wbio);
	s->rbio=rbio;
	s->wbio=wbio;
	}

BIO *SSL_get_rbio(SSL *s)
	{ return(s->rbio); }

BIO *SSL_get_wbio(SSL *s)
	{ return(s->wbio); }

int SSL_get_fd(SSL *s)
	{
	int ret= -1;
	BIO *b,*r;

	b=SSL_get_rbio(s);
	r=BIO_find_type(b,BIO_TYPE_DESCRIPTOR);
	if (r != NULL)
		BIO_get_fd(r,&ret);
	return(ret);
	}

#ifndef NO_SOCK
int SSL_set_fd(SSL *s,int fd)
	{
	int ret=0;
	BIO *bio=NULL;

	bio=BIO_new(BIO_s_socket());

	if (bio == NULL)
		{
		SSLerr(SSL_F_SSL_SET_FD,ERR_R_BUF_LIB);
		goto err;
		}
	BIO_set_fd(bio,fd,BIO_NOCLOSE);
	SSL_set_bio(s,bio,bio);
	ret=1;
err:
	return(ret);
	}

int SSL_set_wfd(SSL *s,int fd)
	{
	int ret=0;
	BIO *bio=NULL;

	if ((s->rbio == NULL) || (BIO_method_type(s->rbio) != BIO_TYPE_SOCKET)
		|| ((int)BIO_get_fd(s->rbio,NULL) != fd))
		{
		bio=BIO_new(BIO_s_socket());

		if (bio == NULL)
			{ SSLerr(SSL_F_SSL_SET_WFD,ERR_R_BUF_LIB); goto err; }
		BIO_set_fd(bio,fd,BIO_NOCLOSE);
		SSL_set_bio(s,SSL_get_rbio(s),bio);
		}
	else
		SSL_set_bio(s,SSL_get_rbio(s),SSL_get_rbio(s));
	ret=1;
err:
	return(ret);
	}

int SSL_set_rfd(SSL *s,int fd)
	{
	int ret=0;
	BIO *bio=NULL;

	if ((s->wbio == NULL) || (BIO_method_type(s->wbio) != BIO_TYPE_SOCKET)
		|| ((int)BIO_get_fd(s->wbio,NULL) != fd))
		{
		bio=BIO_new(BIO_s_socket());

		if (bio == NULL)
			{
			SSLerr(SSL_F_SSL_SET_RFD,ERR_R_BUF_LIB);
			goto err;
			}
		BIO_set_fd(bio,fd,BIO_NOCLOSE);
		SSL_set_bio(s,bio,SSL_get_wbio(s));
		}
	else
		SSL_set_bio(s,SSL_get_wbio(s),SSL_get_wbio(s));
	ret=1;
err:
	return(ret);
	}
#endif

int SSL_get_verify_mode(SSL *s)
	{
	return(s->verify_mode);
	}

int SSL_get_verify_depth(SSL *s)
	{
	return(s->verify_depth);
	}

int (*SSL_get_verify_callback(SSL *s))(int,X509_STORE_CTX *)
	{
	return(s->verify_callback);
	}

int SSL_CTX_get_verify_mode(SSL_CTX *ctx)
	{
	return(ctx->verify_mode);
	}

int SSL_CTX_get_verify_depth(SSL_CTX *ctx)
	{
	return(ctx->verify_depth);
	}

int (*SSL_CTX_get_verify_callback(SSL_CTX *ctx))(int,X509_STORE_CTX *)
	{
	return(ctx->default_verify_callback);
	}

void SSL_set_verify(SSL *s,int mode,
		    int (*callback)(int ok,X509_STORE_CTX *ctx))
	{
	s->verify_mode=mode;
	if (callback != NULL)
		s->verify_callback=callback;
	}

void SSL_set_verify_depth(SSL *s,int depth)
	{
	s->verify_depth=depth;
	}

void SSL_set_read_ahead(SSL *s,int yes)
	{
	s->read_ahead=yes;
	}

int SSL_get_read_ahead(SSL *s)
	{
	return(s->read_ahead);
	}

int SSL_pending(SSL *s)
	{
	return(s->method->ssl_pending(s));
	}

X509 *SSL_get_peer_certificate(SSL *s)
	{
	X509 *r;
	
	if ((s == NULL) || (s->session == NULL))
		r=NULL;
	else
		r=s->session->peer;

	if (r == NULL) return(r);

	CRYPTO_add(&r->references,1,CRYPTO_LOCK_X509);

	return(r);
	}

STACK_OF(X509) *SSL_get_peer_cert_chain(SSL *s)
	{
	STACK_OF(X509) *r;
	
	if ((s == NULL) || (s->session == NULL) || (s->session->cert == NULL))
		r=NULL;
	else
		r=s->session->cert->cert_chain;

	return(r);
	}

/* Now in theory, since the calling process own 't' it should be safe to
 * modify.  We need to be able to read f without being hassled */
void SSL_copy_session_id(SSL *t,SSL *f)
	{
	CERT *tmp;

	/* Do we need to to SSL locking? */
	SSL_set_session(t,SSL_get_session(f));

	/* what if we are setup as SSLv2 but want to talk SSLv3 or
	 * vice-versa */
	if (t->method != f->method)
		{
		t->method->ssl_free(t);	/* cleanup current */
		t->method=f->method;	/* change method */
		t->method->ssl_new(t);	/* setup new */
		}

	tmp=t->cert;
	if (f->cert != NULL)
		{
		CRYPTO_add(&f->cert->references,1,CRYPTO_LOCK_SSL_CERT);
		t->cert=f->cert;
		}
	else
		t->cert=NULL;
	if (tmp != NULL) ssl_cert_free(tmp);
	SSL_set_session_id_context(t,f->sid_ctx,f->sid_ctx_length);
	}

/* Fix this so it checks all the valid key/cert options */
int SSL_CTX_check_private_key(SSL_CTX *ctx)
	{
	if (	(ctx == NULL) ||
		(ctx->default_cert == NULL) ||
		(ctx->default_cert->key->x509 == NULL))
		{
		SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
		return(0);
		}
	if 	(ctx->default_cert->key->privatekey == NULL)
		{
		SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,SSL_R_NO_PRIVATE_KEY_ASSIGNED);
		return(0);
		}
	return(X509_check_private_key(ctx->default_cert->key->x509, ctx->default_cert->key->privatekey));
	}

/* Fix this function so that it takes an optional type parameter */
int SSL_check_private_key(SSL *ssl)
	{
	if (ssl == NULL)
		{
		SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,ERR_R_PASSED_NULL_PARAMETER);
		return(0);
		}
	if (ssl->cert == NULL)
		return(SSL_CTX_check_private_key(ssl->ctx));
	if (ssl->cert->key->x509 == NULL)
		{
		SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
		return(0);
		}
	if (ssl->cert->key->privatekey == NULL)
		{
		SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_PRIVATE_KEY_ASSIGNED);
		return(0);
		}
	return(X509_check_private_key(ssl->cert->key->x509,
		ssl->cert->key->privatekey));
	}

int SSL_accept(SSL *s)
	{
	return(s->method->ssl_accept(s));
	}

int SSL_connect(SSL *s)
	{
	return(s->method->ssl_connect(s));
	}

long SSL_get_default_timeout(SSL *s)
	{
	return(s->method->get_timeout());
	}

int SSL_read(SSL *s,char *buf,int num)
	{
	if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
		{
		s->rwstate=SSL_NOTHING;
		return(0);
		}
	return(s->method->ssl_read(s,buf,num));
	}

int SSL_peek(SSL *s,char *buf,int num)
	{
	if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
		{
		return(0);
		}
	return(s->method->ssl_peek(s,buf,num));
	}

int SSL_write(SSL *s,const char *buf,int num)
	{
	if (s->shutdown & SSL_SENT_SHUTDOWN)
		{
		s->rwstate=SSL_NOTHING;
		SSLerr(SSL_F_SSL_WRITE,SSL_R_PROTOCOL_IS_SHUTDOWN);
		return(-1);
		}
	return(s->method->ssl_write(s,buf,num));
	}

int SSL_shutdown(SSL *s)
	{
	if ((s != NULL) && !SSL_in_init(s))
		return(s->method->ssl_shutdown(s));
	else
		return(1);
	}

int SSL_renegotiate(SSL *s)
	{
	s->new_session=1;
	return(s->method->ssl_renegotiate(s));
	}

long SSL_ctrl(SSL *s,int cmd,long larg,char *parg)
	{
	long l;

	switch (cmd)
		{
	case SSL_CTRL_GET_READ_AHEAD:
		return(s->read_ahead);
	case SSL_CTRL_SET_READ_AHEAD:
		l=s->read_ahead;
		s->read_ahead=larg;
		return(l);
	case SSL_CTRL_OPTIONS:
		return(s->options|=larg);
	default:
		return(s->method->ssl_ctrl(s,cmd,larg,parg));
		}
	}

long SSL_CTX_ctrl(SSL_CTX *ctx,int cmd,long larg,char *parg)
	{
	long l;

	switch (cmd)
		{
	case SSL_CTRL_GET_READ_AHEAD:
		return(ctx->read_ahead);
	case SSL_CTRL_SET_READ_AHEAD:
		l=ctx->read_ahead;
		ctx->read_ahead=larg;
		return(l);

	case SSL_CTRL_SET_SESS_CACHE_SIZE:
		l=ctx->session_cache_size;
		ctx->session_cache_size=larg;
		return(l);
	case SSL_CTRL_GET_SESS_CACHE_SIZE:
		return(ctx->session_cache_size);
	case SSL_CTRL_SET_SESS_CACHE_MODE:
		l=ctx->session_cache_mode;
		ctx->session_cache_mode=larg;
		return(l);
	case SSL_CTRL_GET_SESS_CACHE_MODE:
		return(ctx->session_cache_mode);

	case SSL_CTRL_SESS_NUMBER:
		return(ctx->sessions->num_items);
	case SSL_CTRL_SESS_CONNECT:
		return(ctx->stats.sess_connect);
	case SSL_CTRL_SESS_CONNECT_GOOD:
		return(ctx->stats.sess_connect_good);
	case SSL_CTRL_SESS_CONNECT_RENEGOTIATE:
		return(ctx->stats.sess_connect_renegotiate);
	case SSL_CTRL_SESS_ACCEPT:
		return(ctx->stats.sess_accept);
	case SSL_CTRL_SESS_ACCEPT_GOOD:
		return(ctx->stats.sess_accept_good);
	case SSL_CTRL_SESS_ACCEPT_RENEGOTIATE:
		return(ctx->stats.sess_accept_renegotiate);
	case SSL_CTRL_SESS_HIT:
		return(ctx->stats.sess_hit);
	case SSL_CTRL_SESS_CB_HIT:
		return(ctx->stats.sess_cb_hit);
	case SSL_CTRL_SESS_MISSES:
		return(ctx->stats.sess_miss);
	case SSL_CTRL_SESS_TIMEOUTS:
		return(ctx->stats.sess_timeout);
	case SSL_CTRL_SESS_CACHE_FULL:
		return(ctx->stats.sess_cache_full);
	case SSL_CTRL_OPTIONS:
		return(ctx->options|=larg);
	default:
		return(ctx->method->ssl_ctx_ctrl(ctx,cmd,larg,parg));
		}
	}

int ssl_cipher_id_cmp(SSL_CIPHER *a,SSL_CIPHER *b)
	{
	long l;

	l=a->id-b->id;
	if (l == 0L)
		return(0);
	else
		return((l > 0)?1:-1);
	}

int ssl_cipher_ptr_id_cmp(SSL_CIPHER **ap,SSL_CIPHER **bp)
	{
	long l;

	l=(*ap)->id-(*bp)->id;
	if (l == 0L)
		return(0);
	else
		return((l > 0)?1:-1);
	}

/** return a STACK of the ciphers available for the SSL and in order of
 * preference */
STACK_OF(SSL_CIPHER) *SSL_get_ciphers(SSL *s)
	{
	if ((s != NULL) && (s->cipher_list != NULL))
		{
		return(s->cipher_list);
		}
	else if ((s->ctx != NULL) &&
		(s->ctx->cipher_list != NULL))
		{
		return(s->ctx->cipher_list);
		}
	return(NULL);
	}

/** return a STACK of the ciphers available for the SSL and in order of
 * algorithm id */
STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s)
	{
	if ((s != NULL) && (s->cipher_list_by_id != NULL))
		{
		return(s->cipher_list_by_id);
		}
	else if ((s != NULL) && (s->ctx != NULL) &&
		(s->ctx->cipher_list_by_id != NULL))
		{
		return(s->ctx->cipher_list_by_id);
		}
	return(NULL);
	}

/** The old interface to get the same thing as SSL_get_ciphers() */
const char *SSL_get_cipher_list(SSL *s,int n)
	{
	SSL_CIPHER *c;
	STACK_OF(SSL_CIPHER) *sk;

	if (s == NULL) return(NULL);
	sk=SSL_get_ciphers(s);
	if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= n))
		return(NULL);
	c=sk_SSL_CIPHER_value(sk,n);
	if (c == NULL) return(NULL);
	return(c->name);
	}

/** specify the ciphers to be used by defaut by the SSL_CTX */
int SSL_CTX_set_cipher_list(SSL_CTX *ctx,char *str)
	{
	STACK_OF(SSL_CIPHER) *sk;
	
	sk=ssl_create_cipher_list(ctx->method,&ctx->cipher_list,
		&ctx->cipher_list_by_id,str);
/* XXXX */
	return((sk == NULL)?0:1);
	}

/** specify the ciphers to be used by the SSL */
int SSL_set_cipher_list(SSL *s,char *str)
	{
	STACK_OF(SSL_CIPHER) *sk;
	
	sk=ssl_create_cipher_list(s->ctx->method,&s->cipher_list,
		&s->cipher_list_by_id,str);
/* XXXX */
	return((sk == NULL)?0:1);
	}

/* works well for SSLv2, not so good for SSLv3 */
char *SSL_get_shared_ciphers(SSL *s,char *buf,int len)
	{
	char *p;
	const char *cp;
	STACK_OF(SSL_CIPHER) *sk;
	SSL_CIPHER *c;
	int i;

	if ((s->session == NULL) || (s->session->ciphers == NULL) ||
		(len < 2))
		return(NULL);

	p=buf;
	sk=s->session->ciphers;
	for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
		{
		/* Decrement for either the ':' or a '\0' */
		len--;
		c=sk_SSL_CIPHER_value(sk,i);
		for (cp=c->name; *cp; )
			{
			if (len-- == 0)
				{
				*p='\0';
				return(buf);
				}
			else
				*(p++)= *(cp++);
			}
		*(p++)=':';
		}
	p[-1]='\0';
	return(buf);
	}

int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p)
	{
	int i,j=0;
	SSL_CIPHER *c;
	unsigned char *q;

	if (sk == NULL) return(0);
	q=p;

	for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
		{
		c=sk_SSL_CIPHER_value(sk,i);
		j=ssl_put_cipher_by_char(s,c,p);
		p+=j;
		}
	return(p-q);
	}

STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,unsigned char *p,int num,
					       STACK_OF(SSL_CIPHER) **skp)
	{
	SSL_CIPHER *c;
	STACK_OF(SSL_CIPHER) *sk;
	int i,n;

	n=ssl_put_cipher_by_char(s,NULL,NULL);
	if ((num%n) != 0)
		{
		SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
		return(NULL);
		}
	if ((skp == NULL) || (*skp == NULL))
		sk=sk_SSL_CIPHER_new(NULL); /* change perhaps later */
	else
		{
		sk= *skp;
		sk_SSL_CIPHER_zero(sk);
		}

	for (i=0; i<num; i+=n)
		{
		c=ssl_get_cipher_by_char(s,p);
		p+=n;
		if (c != NULL)
			{
			if (!sk_SSL_CIPHER_push(sk,c))
				{
				SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
				goto err;
				}
			}
		}

	if (skp != NULL)
		*skp=sk;
	return(sk);
err:
	if ((skp == NULL) || (*skp == NULL))
		sk_SSL_CIPHER_free(sk);
	return(NULL);
	}

unsigned long SSL_SESSION_hash(SSL_SESSION *a)
	{
	unsigned long l;

	l=(unsigned long)
		((unsigned int) a->session_id[0]     )|
		((unsigned int) a->session_id[1]<< 8L)|
		((unsigned long)a->session_id[2]<<16L)|
		((unsigned long)a->session_id[3]<<24L);
	return(l);
	}

int SSL_SESSION_cmp(SSL_SESSION *a,SSL_SESSION *b)
	{
	if (a->ssl_version != b->ssl_version)
		return(1);
	if (a->session_id_length != b->session_id_length)
		return(1);
	return(memcmp(a->session_id,b->session_id,a->session_id_length));
	}

SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
	{
	SSL_CTX *ret=NULL;
	
	if (meth == NULL)
		{
		SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_NULL_SSL_METHOD_PASSED);
		return(NULL);
		}

	if (SSL_get_ex_data_X509_STORE_CTX_idx() < 0)
		{
		SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_X509_VERIFICATION_SETUP_PROBLEMS);
		goto err;
		}
	ret=(SSL_CTX *)Malloc(sizeof(SSL_CTX));
	if (ret == NULL)
		goto err;

	memset(ret,0,sizeof(SSL_CTX));

	ret->method=meth;

	ret->cert_store=NULL;
	ret->session_cache_mode=SSL_SESS_CACHE_SERVER;
	ret->session_cache_size=SSL_SESSION_CACHE_MAX_SIZE_DEFAULT;
	ret->session_cache_head=NULL;
	ret->session_cache_tail=NULL;

	/* We take the system default */
	ret->session_timeout=meth->get_timeout();

	ret->new_session_cb=NULL;
	ret->remove_session_cb=NULL;
	ret->get_session_cb=NULL;

	memset((char *)&ret->stats,0,sizeof(ret->stats));

	ret->references=1;
	ret->quiet_shutdown=0;

/*	ret->cipher=NULL;*/
/*	ret->s2->challenge=NULL;
	ret->master_key=NULL;
	ret->key_arg=NULL;
	ret->s2->conn_id=NULL; */

	ret->info_callback=NULL;

	ret->app_verify_callback=NULL;
	ret->app_verify_arg=NULL;

	ret->read_ahead=0;
	ret->verify_mode=SSL_VERIFY_NONE;
	ret->verify_depth=-1; /* Don't impose a limit (but x509_lu.c does) */
	ret->default_verify_callback=NULL;
	if ((ret->default_cert=ssl_cert_new()) == NULL)
		goto err;

	ret->default_passwd_callback=NULL;
	ret->client_cert_cb=NULL;

	ret->sessions=lh_new(SSL_SESSION_hash,SSL_SESSION_cmp);
	if (ret->sessions == NULL) goto err;
	ret->cert_store=X509_STORE_new();
	if (ret->cert_store == NULL) goto err;

	ssl_create_cipher_list(ret->method,
		&ret->cipher_list,&ret->cipher_list_by_id,
		SSL_DEFAULT_CIPHER_LIST);
	if (ret->cipher_list == NULL
	    || sk_SSL_CIPHER_num(ret->cipher_list) <= 0)
		{
		SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_LIBRARY_HAS_NO_CIPHERS);
		goto err2;
		}