/* ssl/ssl_sess.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.]

  */

 #include <stdio.h>

 #include <openssl/lhash.h>

 #include <openssl/rand.h>

 #include "ssl_locl.h"

 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);

 static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);

 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);

 EXPORT_C SSL_SESSION *SSL_get_session(const SSL *ssl)

 /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */

 	{

 	return(ssl->session);

 	}

 EXPORT_C SSL_SESSION *SSL_get1_session(SSL *ssl)

 /* variant of SSL_get_session: caller really gets something */

 	{

 	SSL_SESSION *sess;

 	/* Need to lock this all up rather than just use CRYPTO_add so that

 	 * somebody doesn't free ssl->session between when we check it's

 	 * non-null and when we up the reference count. */

 	CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);

 	sess = ssl->session;

 	if(sess)

 		sess->references++;

 	CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);

 	return(sess);

 	}

 EXPORT_C int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

 	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)

 	{

 	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,

 			new_func, dup_func, free_func);

 	}

 EXPORT_C int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)

 	{

 	return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));

 	}

 EXPORT_C void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)

 	{

 	return(CRYPTO_get_ex_data(&s->ex_data,idx));

 	}

 EXPORT_C SSL_SESSION *SSL_SESSION_new(void)

 	{

 	SSL_SESSION *ss;

 	ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));

 	if (ss == NULL)

 		{

 		SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);

 		return(0);

 		}

 	memset(ss,0,sizeof(SSL_SESSION));

 	ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */

 	ss->references=1;

 	ss->timeout=60*5+4; /* 5 minute timeout by default */

 	ss->time=(unsigned long)time(NULL);

 	ss->prev=NULL;

 	ss->next=NULL;

 	ss->compress_meth=0;

 	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);

 	return(ss);

 	}

 EXPORT_C const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)

 	{

 	if(len)

 		*len = s->session_id_length;

 	return s->session_id;

 	}

 /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1

  * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly

  * until we have no conflict is going to complete in one iteration pretty much

  * "most" of the time (btw: understatement). So, if it takes us 10 iterations

  * and we still can't avoid a conflict - well that's a reasonable point to call

  * it quits. Either the RAND code is broken or someone is trying to open roughly

  * very close to 2^128 (or 2^256) SSL sessions to our server. How you might

  * store that many sessions is perhaps a more interesting question ... */

 #define MAX_SESS_ID_ATTEMPTS 10

 static int def_generate_session_id(const SSL *ssl, unsigned char *id,

 				unsigned int *id_len)

 {

 	unsigned int retry = 0;

 	do

 		if (RAND_pseudo_bytes(id, *id_len) <= 0)

 			return 0;

 	while(SSL_has_matching_session_id(ssl, id, *id_len) &&

 		(++retry < MAX_SESS_ID_ATTEMPTS));

 	if(retry < MAX_SESS_ID_ATTEMPTS)

 		return 1;

 	/* else - woops a session_id match */

 	/* XXX We should also check the external cache --

 	 * but the probability of a collision is negligible, and

 	 * we could not prevent the concurrent creation of sessions

 	 * with identical IDs since we currently don't have means

 	 * to atomically check whether a session ID already exists

 	 * and make a reservation for it if it does not

 	 * (this problem applies to the internal cache as well).

 	 */

 	return 0;

 }

 int ssl_get_new_session(SSL *s, int session)

 	{

 	/* This gets used by clients and servers. */

 	unsigned int tmp;

 	SSL_SESSION *ss=NULL;

 	GEN_SESSION_CB cb = def_generate_session_id;

 	if ((ss=SSL_SESSION_new()) == NULL) return(0);

 	/* If the context has a default timeout, use it */

 	if (s->ctx->session_timeout == 0)

 		ss->timeout=SSL_get_default_timeout(s);

 	else

 		ss->timeout=s->ctx->session_timeout;

 	if (s->session != NULL)

 		{

 		SSL_SESSION_free(s->session);

 		s->session=NULL;

 		}

 	if (session)

 		{

 		if (s->version == SSL2_VERSION)

 			{

 			ss->ssl_version=SSL2_VERSION;

 			ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;

 			}

 		else if (s->version == SSL3_VERSION)

 			{

 			ss->ssl_version=SSL3_VERSION;

 			ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;

 			}

 		else if (s->version == TLS1_VERSION)

 			{

 			ss->ssl_version=TLS1_VERSION;

 			ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;

 			}

 		else if (s->version == DTLS1_VERSION)

 			{

 			ss->ssl_version=DTLS1_VERSION;

 			ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;

 			}

 		else

 			{

 			SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);

 			SSL_SESSION_free(ss);

 			return(0);

 			}

 		/* Choose which callback will set the session ID */

 		CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);

 		if(s->generate_session_id)

 			cb = s->generate_session_id;

 		else if(s->ctx->generate_session_id)

 			cb = s->ctx->generate_session_id;

 		CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);

 		/* Choose a session ID */

 		tmp = ss->session_id_length;

 		if(!cb(s, ss->session_id, &tmp))

 			{

 			/* The callback failed */

 			SSLerr(SSL_F_SSL_GET_NEW_SESSION,

 				SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);

 			SSL_SESSION_free(ss);

 			return(0);

 			}

 		/* Don't allow the callback to set the session length to zero.

 		 * nor set it higher than it was. */

 		if(!tmp || (tmp > ss->session_id_length))

 			{

 			/* The callback set an illegal length */

 			SSLerr(SSL_F_SSL_GET_NEW_SESSION,

 				SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);

 			SSL_SESSION_free(ss);

 			return(0);

 			}

 		/* If the session length was shrunk and we're SSLv2, pad it */

 		if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION))

 			memset(ss->session_id + tmp, 0, ss->session_id_length - tmp);

 		else

 			ss->session_id_length = tmp;

 		/* Finally, check for a conflict */

 		if(SSL_has_matching_session_id(s, ss->session_id,

 						ss->session_id_length))

 			{

 			SSLerr(SSL_F_SSL_GET_NEW_SESSION,

 				SSL_R_SSL_SESSION_ID_CONFLICT);

 			SSL_SESSION_free(ss);

 			return(0);

 			}

 		}

 	else

 		{

 		ss->session_id_length=0;

 		}

 	if (s->sid_ctx_length > sizeof ss->sid_ctx)

 		{

 		SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);

 		SSL_SESSION_free(ss);

 		return 0;

 		}

 	memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);

 	ss->sid_ctx_length=s->sid_ctx_length;

 	s->session=ss;

 	ss->ssl_version=s->version;

 	ss->verify_result = X509_V_OK;

 	return(1);

 	}

 int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,

 			const unsigned char *limit)

 	{

 	/* This is used only by servers. */

 	SSL_SESSION *ret=NULL;

 	int fatal = 0;

 	if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)

 		goto err;

 	if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))

 		{

 		SSL_SESSION data;

 		data.ssl_version=s->version;

 		data.session_id_length=len;

 		if (len == 0)

 			return 0;

  		memcpy(data.session_id,session_id,len);

 		CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);

 		ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,&data);

 		if (ret != NULL)

 		    /* don't allow other threads to steal it: */

 		    CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);

 		CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);

 		}

 	if (ret == NULL)

 		{

 		int copy=1;

 		s->ctx->stats.sess_miss++;

 		ret=NULL;

 		if (s->ctx->get_session_cb != NULL

 		    && (ret=s->ctx->get_session_cb(s,session_id,len,&copy))

 		       != NULL)

 			{

 			s->ctx->stats.sess_cb_hit++;

 			/* Increment reference count now if the session callback

 			 * asks us to do so (note that if the session structures

 			 * returned by the callback are shared between threads,

 			 * it must handle the reference count itself [i.e. copy == 0],

 			 * or things won't be thread-safe). */

 			if (copy)

 				CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);

 			/* Add the externally cached session to the internal

 			 * cache as well if and only if we are supposed to. */

 			if(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE))

 				/* The following should not return 1, otherwise,

 				 * things are very strange */

 				SSL_CTX_add_session(s->ctx,ret);

 			}

 		if (ret == NULL)

 			goto err;

 		}

 	/* Now ret is non-NULL, and we own one of its reference counts. */

 	if (ret->sid_ctx_length != s->sid_ctx_length

 	    || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length))

 		{

 		/* We've found the session named by the client, but we don't

 		 * want to use it in this context. */

 #if 0 /* The client cannot always know when a session is not appropriate,

        * so we shouldn't generate an error message. */

 		SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);

 #endif

 		goto err; /* treat like cache miss */

 		}

 	if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0)

 		{

 		/* We can't be sure if this session is being used out of

 		 * context, which is especially important for SSL_VERIFY_PEER.

 		 * The application should have used SSL[_CTX]_set_session_id_context.

 		 *

 		 * For this error case, we generate an error instead of treating

 		 * the event like a cache miss (otherwise it would be easy for

 		 * applications to effectively disable the session cache by

 		 * accident without anyone noticing).

 		 */

 		SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);

 		fatal = 1;

 		goto err;

 		}

 	if (ret->cipher == NULL)

 		{

 		unsigned char buf[5],*p;

 		unsigned long l;

 		p=buf;

 		l=ret->cipher_id;

 		l2n(l,p);

 		if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)

 			ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));

 		else 

 			ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));

 		if (ret->cipher == NULL)

 			goto err;

 		}

 #if 0 /* This is way too late. */

 	/* If a thread got the session, then 'swaped', and another got

 	 * it and then due to a time-out decided to 'OPENSSL_free' it we could

 	 * be in trouble.  So I'll increment it now, then double decrement

 	 * later - am I speaking rubbish?. */

 	CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);

 #endif

 	if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */

 		{

 		s->ctx->stats.sess_timeout++;

 		/* remove it from the cache */

 		SSL_CTX_remove_session(s->ctx,ret);

 		goto err;

 		}

 	s->ctx->stats.sess_hit++;

 	/* ret->time=time(NULL); */ /* rezero timeout? */

 	/* again, just leave the session 

 	 * if it is the same session, we have just incremented and

 	 * then decremented the reference count :-) */

 	if (s->session != NULL)

 		SSL_SESSION_free(s->session);

 	s->session=ret;

 	s->verify_result = s->session->verify_result;

 	return(1);

  err:

 	if (ret != NULL)

 		SSL_SESSION_free(ret);

 	if (fatal)

 		return -1;

 	else

 		return 0;

 	}

 EXPORT_C int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)

 	{

 	int ret=0;

 	SSL_SESSION *s;

 	/* add just 1 reference count for the SSL_CTX's session cache

 	 * even though it has two ways of access: each session is in a

 	 * doubly linked list and an lhash */

 	CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);

 	/* if session c is in already in cache, we take back the increment later */

 	CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);

 	s=(SSL_SESSION *)lh_insert(ctx->sessions,c);

 	/* s != NULL iff we already had a session with the given PID.

 	 * In this case, s == c should hold (then we did not really modify

 	 * ctx->sessions), or we're in trouble. */

 	if (s != NULL && s != c)

 		{

 		/* We *are* in trouble ... */

 		SSL_SESSION_list_remove(ctx,s);

 		SSL_SESSION_free(s);

 		/* ... so pretend the other session did not exist in cache

 		 * (we cannot handle two SSL_SESSION structures with identical

 		 * session ID in the same cache, which could happen e.g. when

 		 * two threads concurrently obtain the same session from an external

 		 * cache) */

 		s = NULL;

 		}

  	/* Put at the head of the queue unless it is already in the cache */

 	if (s == NULL)

 		SSL_SESSION_list_add(ctx,c);

 	if (s != NULL)

 		{

 		/* existing cache entry -- decrement previously incremented reference

 		 * count because it already takes into account the cache */

 		SSL_SESSION_free(s); /* s == c */

 		ret=0;

 		}

 	else

 		{

 		/* new cache entry -- remove old ones if cache has become too large */

 		ret=1;

 		if (SSL_CTX_sess_get_cache_size(ctx) > 0)

 			{

 			while (SSL_CTX_sess_number(ctx) >

 				SSL_CTX_sess_get_cache_size(ctx))

 				{

 				if (!remove_session_lock(ctx,

 					ctx->session_cache_tail, 0))

 					break;

 				else

 					ctx->stats.sess_cache_full++;

 				}

 			}

 		}

 	CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);

 	return(ret);

 	}

 EXPORT_C int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)

 {

 	return remove_session_lock(ctx, c, 1);

 }

 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)

 	{

 	SSL_SESSION *r;

 	int ret=0;

 	if ((c != NULL) && (c->session_id_length != 0))

 		{

 		if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);

 		if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c)

 			{

 			ret=1;

 			r=(SSL_SESSION *)lh_delete(ctx->sessions,c);

 			SSL_SESSION_list_remove(ctx,c);

 			}

 		if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);

 		if (ret)

 			{

 			r->not_resumable=1;

 			if (ctx->remove_session_cb != NULL)

 				ctx->remove_session_cb(ctx,r);

 			SSL_SESSION_free(r);

 			}

 		}

 	else

 		ret=0;

 	return(ret);

 	}

 EXPORT_C void SSL_SESSION_free(SSL_SESSION *ss)

 	{

 	int i;

 	if(ss == NULL)

 	    return;

 	i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);

 #ifdef REF_PRINT

 	REF_PRINT("SSL_SESSION",ss);

 #endif

 	if (i > 0) return;

 #ifdef REF_CHECK

 	if (i < 0)

 		{

 		fprintf(stderr,"SSL_SESSION_free, bad reference count\n");

 		abort(); /* ok */

 		}

 #endif

 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);

 	OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg);

 	OPENSSL_cleanse(ss->master_key,sizeof ss->master_key);

 	OPENSSL_cleanse(ss->session_id,sizeof ss->session_id);

 	if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);

 	if (ss->peer != NULL) X509_free(ss->peer);

 	if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);

 	OPENSSL_cleanse(ss,sizeof(*ss));

 	OPENSSL_free(ss);

 	}

 EXPORT_C int SSL_set_session(SSL *s, SSL_SESSION *session)

 	{

 	int ret=0;

 	SSL_METHOD *meth;

 	if (session != NULL)

 		{

 		meth=s->ctx->method->get_ssl_method(session->ssl_version);

 		if (meth == NULL)

 			meth=s->method->get_ssl_method(session->ssl_version);

 		if (meth == NULL)

 			{

 			SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);

 			return(0);

 			}

 		if (meth != s->method)

 			{

 			if (!SSL_set_ssl_method(s,meth))

 				return(0);

 			if (s->ctx->session_timeout == 0)

 				session->timeout=SSL_get_default_timeout(s);

 			else

 				session->timeout=s->ctx->session_timeout;

 			}

 #ifndef OPENSSL_NO_KRB5

                 if (s->kssl_ctx && !s->kssl_ctx->client_princ &&

                     session->krb5_client_princ_len > 0)

                 {

                     s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1);

                     memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ,

                             session->krb5_client_princ_len);

                     s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0';

                 }

 #endif /* OPENSSL_NO_KRB5 */

 		/* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/

 		CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);

 		if (s->session != NULL)

 			SSL_SESSION_free(s->session);

 		s->session=session;

 		s->verify_result = s->session->verify_result;

 		/* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/

 		ret=1;

 		}

 	else

 		{

 		if (s->session != NULL)

 			{

 			SSL_SESSION_free(s->session);

 			s->session=NULL;

 			}

 		meth=s->ctx->method;

 		if (meth != s->method)

 			{

 			if (!SSL_set_ssl_method(s,meth))

 				return(0);

 			}

 		ret=1;

 		}

 	return(ret);

 	}

 EXPORT_C long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)

 	{

 	if (s == NULL) return(0);

 	s->timeout=t;

 	return(1);

 	}

 EXPORT_C long SSL_SESSION_get_timeout(const SSL_SESSION *s)

 	{

 	if (s == NULL) return(0);

 	return(s->timeout);

 	}

 EXPORT_C long SSL_SESSION_get_time(const SSL_SESSION *s)

 	{

 	if (s == NULL) return(0);

 	return(s->time);

 	}

 EXPORT_C long SSL_SESSION_set_time(SSL_SESSION *s, long t)

 	{

 	if (s == NULL) return(0);

 	s->time=t;

 	return(t);

 	}

 EXPORT_C long SSL_CTX_set_timeout(SSL_CTX *s, long t)

 	{

 	long l;

 	if (s == NULL) return(0);

 	l=s->session_timeout;

 	s->session_timeout=t;

 	return(l);

 	}

 EXPORT_C long SSL_CTX_get_timeout(const SSL_CTX *s)

 	{

 	if (s == NULL) return(0);

 	return(s->session_timeout);

 	}

 typedef struct timeout_param_st

 	{

 	SSL_CTX *ctx;

 	long time;

 	LHASH *cache;

 	} TIMEOUT_PARAM;

 static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)

 	{

 	if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */

 		{

 		/* The reason we don't call SSL_CTX_remove_session() is to

 		 * save on locking overhead */

 		lh_delete(p->cache,s);

 		SSL_SESSION_list_remove(p->ctx,s);

 		s->not_resumable=1;

 		if (p->ctx->remove_session_cb != NULL)

 			p->ctx->remove_session_cb(p->ctx,s);

 		SSL_SESSION_free(s);

 		}

 	}

 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *)

 EXPORT_C void SSL_CTX_flush_sessions(SSL_CTX *s, long t)

 	{

 	unsigned long i;

 	TIMEOUT_PARAM tp;

 	tp.ctx=s;

 	tp.cache=s->sessions;

 	if (tp.cache == NULL) return;

 	tp.time=t;

 	CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);

 	i=tp.cache->down_load;

 	tp.cache->down_load=0;

 	lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp);

 	tp.cache->down_load=i;

 	CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);

 	}

 int ssl_clear_bad_session(SSL *s)

 	{

 	if (	(s->session != NULL) &&

 		!(s->shutdown & SSL_SENT_SHUTDOWN) &&

 		!(SSL_in_init(s) || SSL_in_before(s)))

 		{

 		SSL_CTX_remove_session(s->ctx,s->session);

 		return(1);

 		}

 	else

 		return(0);

 	}

 /* locked by SSL_CTX in the calling function */

 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)

 	{

 	if ((s->next == NULL) || (s->prev == NULL)) return;

 	if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))

 		{ /* last element in list */

 		if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))

 			{ /* only one element in list */

 			ctx->session_cache_head=NULL;

 			ctx->session_cache_tail=NULL;

 			}

 		else

 			{

 			ctx->session_cache_tail=s->prev;

 			s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);

 			}

 		}

 	else

 		{

 		if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))

 			{ /* first element in list */

 			ctx->session_cache_head=s->next;

 			s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);

 			}

 		else

 			{ /* middle of list */

 			s->next->prev=s->prev;

 			s->prev->next=s->next;

 			}

 		}

 	s->prev=s->next=NULL;

 	}

 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)

 	{

 	if ((s->next != NULL) && (s->prev != NULL))

 		SSL_SESSION_list_remove(ctx,s);

 	if (ctx->session_cache_head == NULL)

 		{

 		ctx->session_cache_head=s;

 		ctx->session_cache_tail=s;

 		s->prev=(SSL_SESSION *)&(ctx->session_cache_head);

 		s->next=(SSL_SESSION *)&(ctx->session_cache_tail);

 		}

 	else

 		{

 		s->next=ctx->session_cache_head;

 		s->next->prev=s;

 		s->prev=(SSL_SESSION *)&(ctx->session_cache_head);

 		ctx->session_cache_head=s;

 		}

 	}

 EXPORT_C void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,

 	int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess))

 	{

 	ctx->new_session_cb=cb;

 	}

 EXPORT_C int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)

 	{

 	return ctx->new_session_cb;

 	}

 EXPORT_C void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,

 	void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess))

 	{

 	ctx->remove_session_cb=cb;

 	}

 EXPORT_C void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess)

 	{

 	return ctx->remove_session_cb;

 	}

 EXPORT_C void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,

 	SSL_SESSION *(*cb)(struct ssl_st *ssl,

 	         unsigned char *data,int len,int *copy))

 	{

 	ctx->get_session_cb=cb;

 	}

 EXPORT_C SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl,

 	         unsigned char *data,int len,int *copy)

 	{

 	return ctx->get_session_cb;

 	}

 EXPORT_C void SSL_CTX_set_info_callback(SSL_CTX *ctx, 

 	void (*cb)(const SSL *ssl,int type,int val))

 	{

 	ctx->info_callback=cb;

 	}

 EXPORT_C void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val)

 	{

 	return ctx->info_callback;

 	}

 EXPORT_C void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,

 	int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))

 	{

 	ctx->client_cert_cb=cb;

 	}

 EXPORT_C int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey)

 	{

 	return ctx->client_cert_cb;

 	}

 EXPORT_C void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,

 	int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len))

 	{

 	ctx->app_gen_cookie_cb=cb;

 	}

 EXPORT_C void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,

 	int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len))

 	{

 	ctx->app_verify_cookie_cb=cb;

 	}