sl@0: /* ssl/ssl_sess.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include <openssl/lhash.h>
sl@0: #include <openssl/rand.h>
sl@0: #include "ssl_locl.h"
sl@0: 
sl@0: static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
sl@0: static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
sl@0: static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
sl@0: 
sl@0: EXPORT_C SSL_SESSION *SSL_get_session(const SSL *ssl)
sl@0: /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
sl@0: 	{
sl@0: 	return(ssl->session);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C SSL_SESSION *SSL_get1_session(SSL *ssl)
sl@0: /* variant of SSL_get_session: caller really gets something */
sl@0: 	{
sl@0: 	SSL_SESSION *sess;
sl@0: 	/* Need to lock this all up rather than just use CRYPTO_add so that
sl@0: 	 * somebody doesn't free ssl->session between when we check it's
sl@0: 	 * non-null and when we up the reference count. */
sl@0: 	CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
sl@0: 	sess = ssl->session;
sl@0: 	if(sess)
sl@0: 		sess->references++;
sl@0: 	CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
sl@0: 	return(sess);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
sl@0: 	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
sl@0: 	{
sl@0: 	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,
sl@0: 			new_func, dup_func, free_func);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
sl@0: 	{
sl@0: 	return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
sl@0: 	{
sl@0: 	return(CRYPTO_get_ex_data(&s->ex_data,idx));
sl@0: 	}
sl@0: 
sl@0: EXPORT_C SSL_SESSION *SSL_SESSION_new(void)
sl@0: 	{
sl@0: 	SSL_SESSION *ss;
sl@0: 
sl@0: 	ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));
sl@0: 	if (ss == NULL)
sl@0: 		{
sl@0: 		SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
sl@0: 		return(0);
sl@0: 		}
sl@0: 	memset(ss,0,sizeof(SSL_SESSION));
sl@0: 
sl@0: 	ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
sl@0: 	ss->references=1;
sl@0: 	ss->timeout=60*5+4; /* 5 minute timeout by default */
sl@0: 	ss->time=(unsigned long)time(NULL);
sl@0: 	ss->prev=NULL;
sl@0: 	ss->next=NULL;
sl@0: 	ss->compress_meth=0;
sl@0: 	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
sl@0: 	return(ss);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
sl@0: 	{
sl@0: 	if(len)
sl@0: 		*len = s->session_id_length;
sl@0: 	return s->session_id;
sl@0: 	}
sl@0: 
sl@0: /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1
sl@0:  * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly
sl@0:  * until we have no conflict is going to complete in one iteration pretty much
sl@0:  * "most" of the time (btw: understatement). So, if it takes us 10 iterations
sl@0:  * and we still can't avoid a conflict - well that's a reasonable point to call
sl@0:  * it quits. Either the RAND code is broken or someone is trying to open roughly
sl@0:  * very close to 2^128 (or 2^256) SSL sessions to our server. How you might
sl@0:  * store that many sessions is perhaps a more interesting question ... */
sl@0: 
sl@0: #define MAX_SESS_ID_ATTEMPTS 10
sl@0: static int def_generate_session_id(const SSL *ssl, unsigned char *id,
sl@0: 				unsigned int *id_len)
sl@0: {
sl@0: 	unsigned int retry = 0;
sl@0: 	do
sl@0: 		if (RAND_pseudo_bytes(id, *id_len) <= 0)
sl@0: 			return 0;
sl@0: 	while(SSL_has_matching_session_id(ssl, id, *id_len) &&
sl@0: 		(++retry < MAX_SESS_ID_ATTEMPTS));
sl@0: 	if(retry < MAX_SESS_ID_ATTEMPTS)
sl@0: 		return 1;
sl@0: 	/* else - woops a session_id match */
sl@0: 	/* XXX We should also check the external cache --
sl@0: 	 * but the probability of a collision is negligible, and
sl@0: 	 * we could not prevent the concurrent creation of sessions
sl@0: 	 * with identical IDs since we currently don't have means
sl@0: 	 * to atomically check whether a session ID already exists
sl@0: 	 * and make a reservation for it if it does not
sl@0: 	 * (this problem applies to the internal cache as well).
sl@0: 	 */
sl@0: 	return 0;
sl@0: }
sl@0: 
sl@0: int ssl_get_new_session(SSL *s, int session)
sl@0: 	{
sl@0: 	/* This gets used by clients and servers. */
sl@0: 
sl@0: 	unsigned int tmp;
sl@0: 	SSL_SESSION *ss=NULL;
sl@0: 	GEN_SESSION_CB cb = def_generate_session_id;
sl@0: 
sl@0: 	if ((ss=SSL_SESSION_new()) == NULL) return(0);
sl@0: 
sl@0: 	/* If the context has a default timeout, use it */
sl@0: 	if (s->ctx->session_timeout == 0)
sl@0: 		ss->timeout=SSL_get_default_timeout(s);
sl@0: 	else
sl@0: 		ss->timeout=s->ctx->session_timeout;
sl@0: 
sl@0: 	if (s->session != NULL)
sl@0: 		{
sl@0: 		SSL_SESSION_free(s->session);
sl@0: 		s->session=NULL;
sl@0: 		}
sl@0: 
sl@0: 	if (session)
sl@0: 		{
sl@0: 		if (s->version == SSL2_VERSION)
sl@0: 			{
sl@0: 			ss->ssl_version=SSL2_VERSION;
sl@0: 			ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
sl@0: 			}
sl@0: 		else if (s->version == SSL3_VERSION)
sl@0: 			{
sl@0: 			ss->ssl_version=SSL3_VERSION;
sl@0: 			ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
sl@0: 			}
sl@0: 		else if (s->version == TLS1_VERSION)
sl@0: 			{
sl@0: 			ss->ssl_version=TLS1_VERSION;
sl@0: 			ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
sl@0: 			}
sl@0: 		else if (s->version == DTLS1_VERSION)
sl@0: 			{
sl@0: 			ss->ssl_version=DTLS1_VERSION;
sl@0: 			ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
sl@0: 			SSL_SESSION_free(ss);
sl@0: 			return(0);
sl@0: 			}
sl@0: 		/* Choose which callback will set the session ID */
sl@0: 		CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
sl@0: 		if(s->generate_session_id)
sl@0: 			cb = s->generate_session_id;
sl@0: 		else if(s->ctx->generate_session_id)
sl@0: 			cb = s->ctx->generate_session_id;
sl@0: 		CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
sl@0: 		/* Choose a session ID */
sl@0: 		tmp = ss->session_id_length;
sl@0: 		if(!cb(s, ss->session_id, &tmp))
sl@0: 			{
sl@0: 			/* The callback failed */
sl@0: 			SSLerr(SSL_F_SSL_GET_NEW_SESSION,
sl@0: 				SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
sl@0: 			SSL_SESSION_free(ss);
sl@0: 			return(0);
sl@0: 			}
sl@0: 		/* Don't allow the callback to set the session length to zero.
sl@0: 		 * nor set it higher than it was. */
sl@0: 		if(!tmp || (tmp > ss->session_id_length))
sl@0: 			{
sl@0: 			/* The callback set an illegal length */
sl@0: 			SSLerr(SSL_F_SSL_GET_NEW_SESSION,
sl@0: 				SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
sl@0: 			SSL_SESSION_free(ss);
sl@0: 			return(0);
sl@0: 			}
sl@0: 		/* If the session length was shrunk and we're SSLv2, pad it */
sl@0: 		if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION))
sl@0: 			memset(ss->session_id + tmp, 0, ss->session_id_length - tmp);
sl@0: 		else
sl@0: 			ss->session_id_length = tmp;
sl@0: 		/* Finally, check for a conflict */
sl@0: 		if(SSL_has_matching_session_id(s, ss->session_id,
sl@0: 						ss->session_id_length))
sl@0: 			{
sl@0: 			SSLerr(SSL_F_SSL_GET_NEW_SESSION,
sl@0: 				SSL_R_SSL_SESSION_ID_CONFLICT);
sl@0: 			SSL_SESSION_free(ss);
sl@0: 			return(0);
sl@0: 			}
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		ss->session_id_length=0;
sl@0: 		}
sl@0: 
sl@0: 	if (s->sid_ctx_length > sizeof ss->sid_ctx)
sl@0: 		{
sl@0: 		SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
sl@0: 		SSL_SESSION_free(ss);
sl@0: 		return 0;
sl@0: 		}
sl@0: 	memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
sl@0: 	ss->sid_ctx_length=s->sid_ctx_length;
sl@0: 	s->session=ss;
sl@0: 	ss->ssl_version=s->version;
sl@0: 	ss->verify_result = X509_V_OK;
sl@0: 
sl@0: 	return(1);
sl@0: 	}
sl@0: 
sl@0: int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
sl@0: 			const unsigned char *limit)
sl@0: 	{
sl@0: 	/* This is used only by servers. */
sl@0: 
sl@0: 	SSL_SESSION *ret=NULL;
sl@0: 	int fatal = 0;
sl@0:   
sl@0: 	if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
sl@0: 		goto err;
sl@0: 
sl@0: 	if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
sl@0: 
sl@0: 		{
sl@0: 		SSL_SESSION data;
sl@0: 		data.ssl_version=s->version;
sl@0: 		data.session_id_length=len;
sl@0: 		if (len == 0)
sl@0: 			return 0;
sl@0:  		memcpy(data.session_id,session_id,len);
sl@0: 		CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
sl@0: 		ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,&data);
sl@0: 		if (ret != NULL)
sl@0: 		    /* don't allow other threads to steal it: */
sl@0: 		    CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
sl@0: 		CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
sl@0: 		}
sl@0: 
sl@0: 	if (ret == NULL)
sl@0: 		{
sl@0: 		int copy=1;
sl@0: 	
sl@0: 		s->ctx->stats.sess_miss++;
sl@0: 		ret=NULL;
sl@0: 		if (s->ctx->get_session_cb != NULL
sl@0: 		    && (ret=s->ctx->get_session_cb(s,session_id,len,&copy))
sl@0: 		       != NULL)
sl@0: 			{
sl@0: 			s->ctx->stats.sess_cb_hit++;
sl@0: 
sl@0: 			/* Increment reference count now if the session callback
sl@0: 			 * asks us to do so (note that if the session structures
sl@0: 			 * returned by the callback are shared between threads,
sl@0: 			 * it must handle the reference count itself [i.e. copy == 0],
sl@0: 			 * or things won't be thread-safe). */
sl@0: 			if (copy)
sl@0: 				CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
sl@0: 
sl@0: 			/* Add the externally cached session to the internal
sl@0: 			 * cache as well if and only if we are supposed to. */
sl@0: 			if(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE))
sl@0: 				/* The following should not return 1, otherwise,
sl@0: 				 * things are very strange */
sl@0: 				SSL_CTX_add_session(s->ctx,ret);
sl@0: 			}
sl@0: 		if (ret == NULL)
sl@0: 			goto err;
sl@0: 		}
sl@0: 
sl@0: 	/* Now ret is non-NULL, and we own one of its reference counts. */
sl@0: 
sl@0: 	if (ret->sid_ctx_length != s->sid_ctx_length
sl@0: 	    || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length))
sl@0: 		{
sl@0: 		/* We've found the session named by the client, but we don't
sl@0: 		 * want to use it in this context. */
sl@0: 
sl@0: #if 0 /* The client cannot always know when a session is not appropriate,
sl@0:        * so we shouldn't generate an error message. */
sl@0: 
sl@0: 		SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
sl@0: #endif
sl@0: 		goto err; /* treat like cache miss */
sl@0: 		}
sl@0: 	
sl@0: 	if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0)
sl@0: 		{
sl@0: 		/* We can't be sure if this session is being used out of
sl@0: 		 * context, which is especially important for SSL_VERIFY_PEER.
sl@0: 		 * The application should have used SSL[_CTX]_set_session_id_context.
sl@0: 		 *
sl@0: 		 * For this error case, we generate an error instead of treating
sl@0: 		 * the event like a cache miss (otherwise it would be easy for
sl@0: 		 * applications to effectively disable the session cache by
sl@0: 		 * accident without anyone noticing).
sl@0: 		 */
sl@0: 		
sl@0: 		SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
sl@0: 		fatal = 1;
sl@0: 		goto err;
sl@0: 		}
sl@0: 
sl@0: 	if (ret->cipher == NULL)
sl@0: 		{
sl@0: 		unsigned char buf[5],*p;
sl@0: 		unsigned long l;
sl@0: 
sl@0: 		p=buf;
sl@0: 		l=ret->cipher_id;
sl@0: 		l2n(l,p);
sl@0: 		if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
sl@0: 			ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
sl@0: 		else 
sl@0: 			ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
sl@0: 		if (ret->cipher == NULL)
sl@0: 			goto err;
sl@0: 		}
sl@0: 
sl@0: 
sl@0: #if 0 /* This is way too late. */
sl@0: 
sl@0: 	/* If a thread got the session, then 'swaped', and another got
sl@0: 	 * it and then due to a time-out decided to 'OPENSSL_free' it we could
sl@0: 	 * be in trouble.  So I'll increment it now, then double decrement
sl@0: 	 * later - am I speaking rubbish?. */
sl@0: 	CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
sl@0: #endif
sl@0: 
sl@0: 	if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */
sl@0: 		{
sl@0: 		s->ctx->stats.sess_timeout++;
sl@0: 		/* remove it from the cache */
sl@0: 		SSL_CTX_remove_session(s->ctx,ret);
sl@0: 		goto err;
sl@0: 		}
sl@0: 
sl@0: 	s->ctx->stats.sess_hit++;
sl@0: 
sl@0: 	/* ret->time=time(NULL); */ /* rezero timeout? */
sl@0: 	/* again, just leave the session 
sl@0: 	 * if it is the same session, we have just incremented and
sl@0: 	 * then decremented the reference count :-) */
sl@0: 	if (s->session != NULL)
sl@0: 		SSL_SESSION_free(s->session);
sl@0: 	s->session=ret;
sl@0: 	s->verify_result = s->session->verify_result;
sl@0: 	return(1);
sl@0: 
sl@0:  err:
sl@0: 	if (ret != NULL)
sl@0: 		SSL_SESSION_free(ret);
sl@0: 	if (fatal)
sl@0: 		return -1;
sl@0: 	else
sl@0: 		return 0;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
sl@0: 	{
sl@0: 	int ret=0;
sl@0: 	SSL_SESSION *s;
sl@0: 
sl@0: 	/* add just 1 reference count for the SSL_CTX's session cache
sl@0: 	 * even though it has two ways of access: each session is in a
sl@0: 	 * doubly linked list and an lhash */
sl@0: 	CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
sl@0: 	/* if session c is in already in cache, we take back the increment later */
sl@0: 
sl@0: 	CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
sl@0: 	s=(SSL_SESSION *)lh_insert(ctx->sessions,c);
sl@0: 	
sl@0: 	/* s != NULL iff we already had a session with the given PID.
sl@0: 	 * In this case, s == c should hold (then we did not really modify
sl@0: 	 * ctx->sessions), or we're in trouble. */
sl@0: 	if (s != NULL && s != c)
sl@0: 		{
sl@0: 		/* We *are* in trouble ... */
sl@0: 		SSL_SESSION_list_remove(ctx,s);
sl@0: 		SSL_SESSION_free(s);
sl@0: 		/* ... so pretend the other session did not exist in cache
sl@0: 		 * (we cannot handle two SSL_SESSION structures with identical
sl@0: 		 * session ID in the same cache, which could happen e.g. when
sl@0: 		 * two threads concurrently obtain the same session from an external
sl@0: 		 * cache) */
sl@0: 		s = NULL;
sl@0: 		}
sl@0: 
sl@0:  	/* Put at the head of the queue unless it is already in the cache */
sl@0: 	if (s == NULL)
sl@0: 		SSL_SESSION_list_add(ctx,c);
sl@0: 
sl@0: 	if (s != NULL)
sl@0: 		{
sl@0: 		/* existing cache entry -- decrement previously incremented reference
sl@0: 		 * count because it already takes into account the cache */
sl@0: 
sl@0: 		SSL_SESSION_free(s); /* s == c */
sl@0: 		ret=0;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		/* new cache entry -- remove old ones if cache has become too large */
sl@0: 		
sl@0: 		ret=1;
sl@0: 
sl@0: 		if (SSL_CTX_sess_get_cache_size(ctx) > 0)
sl@0: 			{
sl@0: 			while (SSL_CTX_sess_number(ctx) >
sl@0: 				SSL_CTX_sess_get_cache_size(ctx))
sl@0: 				{
sl@0: 				if (!remove_session_lock(ctx,
sl@0: 					ctx->session_cache_tail, 0))
sl@0: 					break;
sl@0: 				else
sl@0: 					ctx->stats.sess_cache_full++;
sl@0: 				}
sl@0: 			}
sl@0: 		}
sl@0: 	CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
sl@0: {
sl@0: 	return remove_session_lock(ctx, c, 1);
sl@0: }
sl@0: 
sl@0: static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
sl@0: 	{
sl@0: 	SSL_SESSION *r;
sl@0: 	int ret=0;
sl@0: 
sl@0: 	if ((c != NULL) && (c->session_id_length != 0))
sl@0: 		{
sl@0: 		if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
sl@0: 		if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c)
sl@0: 			{
sl@0: 			ret=1;
sl@0: 			r=(SSL_SESSION *)lh_delete(ctx->sessions,c);
sl@0: 			SSL_SESSION_list_remove(ctx,c);
sl@0: 			}
sl@0: 
sl@0: 		if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
sl@0: 
sl@0: 		if (ret)
sl@0: 			{
sl@0: 			r->not_resumable=1;
sl@0: 			if (ctx->remove_session_cb != NULL)
sl@0: 				ctx->remove_session_cb(ctx,r);
sl@0: 			SSL_SESSION_free(r);
sl@0: 			}
sl@0: 		}
sl@0: 	else
sl@0: 		ret=0;
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void SSL_SESSION_free(SSL_SESSION *ss)
sl@0: 	{
sl@0: 	int i;
sl@0: 
sl@0: 	if(ss == NULL)
sl@0: 	    return;
sl@0: 
sl@0: 	i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
sl@0: #ifdef REF_PRINT
sl@0: 	REF_PRINT("SSL_SESSION",ss);
sl@0: #endif
sl@0: 	if (i > 0) return;
sl@0: #ifdef REF_CHECK
sl@0: 	if (i < 0)
sl@0: 		{
sl@0: 		fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
sl@0: 		abort(); /* ok */
sl@0: 		}
sl@0: #endif
sl@0: 
sl@0: 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
sl@0: 
sl@0: 	OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg);
sl@0: 	OPENSSL_cleanse(ss->master_key,sizeof ss->master_key);
sl@0: 	OPENSSL_cleanse(ss->session_id,sizeof ss->session_id);
sl@0: 	if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
sl@0: 	if (ss->peer != NULL) X509_free(ss->peer);
sl@0: 	if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
sl@0: 
sl@0: 	OPENSSL_cleanse(ss,sizeof(*ss));
sl@0: 	OPENSSL_free(ss);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int SSL_set_session(SSL *s, SSL_SESSION *session)
sl@0: 	{
sl@0: 	int ret=0;
sl@0: 	SSL_METHOD *meth;
sl@0: 
sl@0: 	if (session != NULL)
sl@0: 		{
sl@0: 		meth=s->ctx->method->get_ssl_method(session->ssl_version);
sl@0: 		if (meth == NULL)
sl@0: 			meth=s->method->get_ssl_method(session->ssl_version);
sl@0: 		if (meth == NULL)
sl@0: 			{
sl@0: 			SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
sl@0: 			return(0);
sl@0: 			}
sl@0: 
sl@0: 		if (meth != s->method)
sl@0: 			{
sl@0: 			if (!SSL_set_ssl_method(s,meth))
sl@0: 				return(0);
sl@0: 			if (s->ctx->session_timeout == 0)
sl@0: 				session->timeout=SSL_get_default_timeout(s);
sl@0: 			else
sl@0: 				session->timeout=s->ctx->session_timeout;
sl@0: 			}
sl@0: 
sl@0: #ifndef OPENSSL_NO_KRB5
sl@0:                 if (s->kssl_ctx && !s->kssl_ctx->client_princ &&
sl@0:                     session->krb5_client_princ_len > 0)
sl@0:                 {
sl@0:                     s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1);
sl@0:                     memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ,
sl@0:                             session->krb5_client_princ_len);
sl@0:                     s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0';
sl@0:                 }
sl@0: #endif /* OPENSSL_NO_KRB5 */
sl@0: 
sl@0: 		/* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
sl@0: 		CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
sl@0: 		if (s->session != NULL)
sl@0: 			SSL_SESSION_free(s->session);
sl@0: 		s->session=session;
sl@0: 		s->verify_result = s->session->verify_result;
sl@0: 		/* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
sl@0: 		ret=1;
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		if (s->session != NULL)
sl@0: 			{
sl@0: 			SSL_SESSION_free(s->session);
sl@0: 			s->session=NULL;
sl@0: 			}
sl@0: 
sl@0: 		meth=s->ctx->method;
sl@0: 		if (meth != s->method)
sl@0: 			{
sl@0: 			if (!SSL_set_ssl_method(s,meth))
sl@0: 				return(0);
sl@0: 			}
sl@0: 		ret=1;
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
sl@0: 	{
sl@0: 	if (s == NULL) return(0);
sl@0: 	s->timeout=t;
sl@0: 	return(1);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C long SSL_SESSION_get_timeout(const SSL_SESSION *s)
sl@0: 	{
sl@0: 	if (s == NULL) return(0);
sl@0: 	return(s->timeout);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C long SSL_SESSION_get_time(const SSL_SESSION *s)
sl@0: 	{
sl@0: 	if (s == NULL) return(0);
sl@0: 	return(s->time);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C long SSL_SESSION_set_time(SSL_SESSION *s, long t)
sl@0: 	{
sl@0: 	if (s == NULL) return(0);
sl@0: 	s->time=t;
sl@0: 	return(t);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C long SSL_CTX_set_timeout(SSL_CTX *s, long t)
sl@0: 	{
sl@0: 	long l;
sl@0: 	if (s == NULL) return(0);
sl@0: 	l=s->session_timeout;
sl@0: 	s->session_timeout=t;
sl@0: 	return(l);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C long SSL_CTX_get_timeout(const SSL_CTX *s)
sl@0: 	{
sl@0: 	if (s == NULL) return(0);
sl@0: 	return(s->session_timeout);
sl@0: 	}
sl@0: 
sl@0: typedef struct timeout_param_st
sl@0: 	{
sl@0: 	SSL_CTX *ctx;
sl@0: 	long time;
sl@0: 	LHASH *cache;
sl@0: 	} TIMEOUT_PARAM;
sl@0: 
sl@0: static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
sl@0: 	{
sl@0: 	if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
sl@0: 		{
sl@0: 		/* The reason we don't call SSL_CTX_remove_session() is to
sl@0: 		 * save on locking overhead */
sl@0: 		lh_delete(p->cache,s);
sl@0: 		SSL_SESSION_list_remove(p->ctx,s);
sl@0: 		s->not_resumable=1;
sl@0: 		if (p->ctx->remove_session_cb != NULL)
sl@0: 			p->ctx->remove_session_cb(p->ctx,s);
sl@0: 		SSL_SESSION_free(s);
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *)
sl@0: 
sl@0: EXPORT_C void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
sl@0: 	{
sl@0: 	unsigned long i;
sl@0: 	TIMEOUT_PARAM tp;
sl@0: 
sl@0: 	tp.ctx=s;
sl@0: 	tp.cache=s->sessions;
sl@0: 	if (tp.cache == NULL) return;
sl@0: 	tp.time=t;
sl@0: 	CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
sl@0: 	i=tp.cache->down_load;
sl@0: 	tp.cache->down_load=0;
sl@0: 	lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp);
sl@0: 	tp.cache->down_load=i;
sl@0: 	CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
sl@0: 	}
sl@0: 
sl@0: int ssl_clear_bad_session(SSL *s)
sl@0: 	{
sl@0: 	if (	(s->session != NULL) &&
sl@0: 		!(s->shutdown & SSL_SENT_SHUTDOWN) &&
sl@0: 		!(SSL_in_init(s) || SSL_in_before(s)))
sl@0: 		{
sl@0: 		SSL_CTX_remove_session(s->ctx,s->session);
sl@0: 		return(1);
sl@0: 		}
sl@0: 	else
sl@0: 		return(0);
sl@0: 	}
sl@0: 
sl@0: /* locked by SSL_CTX in the calling function */
sl@0: static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
sl@0: 	{
sl@0: 	if ((s->next == NULL) || (s->prev == NULL)) return;
sl@0: 
sl@0: 	if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
sl@0: 		{ /* last element in list */
sl@0: 		if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
sl@0: 			{ /* only one element in list */
sl@0: 			ctx->session_cache_head=NULL;
sl@0: 			ctx->session_cache_tail=NULL;
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			ctx->session_cache_tail=s->prev;
sl@0: 			s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
sl@0: 			}
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
sl@0: 			{ /* first element in list */
sl@0: 			ctx->session_cache_head=s->next;
sl@0: 			s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
sl@0: 			}
sl@0: 		else
sl@0: 			{ /* middle of list */
sl@0: 			s->next->prev=s->prev;
sl@0: 			s->prev->next=s->next;
sl@0: 			}
sl@0: 		}
sl@0: 	s->prev=s->next=NULL;
sl@0: 	}
sl@0: 
sl@0: static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
sl@0: 	{
sl@0: 	if ((s->next != NULL) && (s->prev != NULL))
sl@0: 		SSL_SESSION_list_remove(ctx,s);
sl@0: 
sl@0: 	if (ctx->session_cache_head == NULL)
sl@0: 		{
sl@0: 		ctx->session_cache_head=s;
sl@0: 		ctx->session_cache_tail=s;
sl@0: 		s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
sl@0: 		s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		s->next=ctx->session_cache_head;
sl@0: 		s->next->prev=s;
sl@0: 		s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
sl@0: 		ctx->session_cache_head=s;
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
sl@0: 	int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess))
sl@0: 	{
sl@0: 	ctx->new_session_cb=cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)
sl@0: 	{
sl@0: 	return ctx->new_session_cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
sl@0: 	void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess))
sl@0: 	{
sl@0: 	ctx->remove_session_cb=cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess)
sl@0: 	{
sl@0: 	return ctx->remove_session_cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
sl@0: 	SSL_SESSION *(*cb)(struct ssl_st *ssl,
sl@0: 	         unsigned char *data,int len,int *copy))
sl@0: 	{
sl@0: 	ctx->get_session_cb=cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl,
sl@0: 	         unsigned char *data,int len,int *copy)
sl@0: 	{
sl@0: 	return ctx->get_session_cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void SSL_CTX_set_info_callback(SSL_CTX *ctx, 
sl@0: 	void (*cb)(const SSL *ssl,int type,int val))
sl@0: 	{
sl@0: 	ctx->info_callback=cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val)
sl@0: 	{
sl@0: 	return ctx->info_callback;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
sl@0: 	int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))
sl@0: 	{
sl@0: 	ctx->client_cert_cb=cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey)
sl@0: 	{
sl@0: 	return ctx->client_cert_cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
sl@0: 	int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len))
sl@0: 	{
sl@0: 	ctx->app_gen_cookie_cb=cb;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
sl@0: 	int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len))
sl@0: 	{
sl@0: 	ctx->app_verify_cookie_cb=cb;
sl@0: 	}
sl@0: