ssl_sess.c
/* 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 "lhash.h"
#include "rand.h"
#include "ssl_locl.h"
#ifndef NOPROTO
static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
#else
static void SSL_SESSION_list_remove();
static void SSL_SESSION_list_add();
#endif
static int ssl_session_num=0;
static STACK *ssl_session_meth=NULL;
SSL_SESSION *SSL_get_session(ssl)
SSL *ssl;
{
return(ssl->session);
}
int SSL_SESSION_get_ex_new_index(argl,argp,new_func,dup_func,free_func)
long argl;
char *argp;
int (*new_func)();
int (*dup_func)();
void (*free_func)();
{
ssl_session_num++;
return(CRYPTO_get_ex_new_index(ssl_session_num-1,
&ssl_session_meth,
argl,argp,new_func,dup_func,free_func));
}
int SSL_SESSION_set_ex_data(s,idx,arg)
SSL_SESSION *s;
int idx;
char *arg;
{
return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
}
char *SSL_SESSION_get_ex_data(s,idx)
SSL_SESSION *s;
int idx;
{
return(CRYPTO_get_ex_data(&s->ex_data,idx));
}
SSL_SESSION *SSL_SESSION_new()
{
SSL_SESSION *ss;
ss=(SSL_SESSION *)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->references=1;
ss->timeout=60*5+4; /* 5 minute timeout by default */
ss->time=time(NULL);
ss->prev=NULL;
ss->next=NULL;
CRYPTO_new_ex_data(ssl_session_meth,(char *)ss,&ss->ex_data);
return(ss);
}
int ssl_get_new_session(s, session)
SSL *s;
int session;
{
SSL_SESSION *ss=NULL;
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);
if (s->session != NULL)
{
SSL_SESSION_free(s->session);
s->session=NULL;
}
if (session)
{
if (s->version == SSL2_CLIENT_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
{
SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
SSL_SESSION_free(ss);
return(0);
}
for (;;)
{
SSL_SESSION *r;
RAND_bytes(ss->session_id,ss->session_id_length);
CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
r=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,
(char *)ss);
CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
if (r == NULL) break;
/* else - woops a session_id match */
}
}
else
{
ss->session_id_length=0;
}
s->session=ss;
ss->ssl_version=s->version;
return(1);
}
int ssl_get_prev_session(s,session_id,len)
SSL *s;
unsigned char *session_id;
int len;
{
SSL_SESSION *ret=NULL,data;
/* conn_init();*/
data.ssl_version=s->version;
data.session_id_length=len;
if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
return(0);
memcpy(data.session_id,session_id,len);;
if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
{
CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,(char *)&data);
CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
}
if (ret == NULL)
{
int copy=1;
s->ctx->sess_miss++;
ret=NULL;
if ((s->ctx->get_session_cb != NULL) &&
((ret=s->ctx->get_session_cb(s,session_id,len,©))
!= NULL))
{
s->ctx->sess_cb_hit++;
/* The following should not return 1, otherwise,
* things are very strange */
SSL_CTX_add_session(s->ctx,ret);
/* auto free it */
if (!copy)
SSL_SESSION_free(ret);
}
if (ret == NULL) return(0);
}
if (ret->cipher == NULL)
{
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)
return(0);
}
/* If a thread got the session, then 'swaped', and another got
* it and then due to a time-out decided to '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);
if ((long)(ret->time+ret->timeout) < (long)time(NULL)) /* timeout */
{
s->ctx->sess_timeout++;
/* remove it from the cache */
SSL_CTX_remove_session(s->ctx,ret);
SSL_SESSION_free(ret); /* again to actually Free it */
return(0);
}
s->ctx->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;
return(1);
}
int SSL_CTX_add_session(ctx,c)
SSL_CTX *ctx;
SSL_SESSION *c;
{
int ret=0;
SSL_SESSION *s;
/* conn_init(); */
CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
s=(SSL_SESSION *)lh_insert(ctx->sessions,(char *)c);
/* Put on the end of the queue unless it is already in the cache */
if (s == NULL)
SSL_SESSION_list_add(ctx,c);
/* If the same session if is being 're-added', Free the old
* one when the last person stops using it.
* This will also work if it is alread in the cache.
* The references will go up and then down :-) */
if (s != NULL)
{
SSL_SESSION_free(s);
ret=0;
}
else
{
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 (!SSL_CTX_remove_session(ctx,
ctx->session_cache_tail))
break;
else
ctx->sess_cache_full++;
}
}
}
CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
return(ret);
}
int SSL_CTX_remove_session(ctx,c)
SSL_CTX *ctx;
SSL_SESSION *c;
{
SSL_SESSION *r;
int ret=0;
if ((c != NULL) && (c->session_id_length != 0))
{
CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
r=(SSL_SESSION *)lh_delete(ctx->sessions,(char *)c);
if (r != NULL)
{
ret=1;
SSL_SESSION_list_remove(ctx,c);
}
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);
}
void SSL_SESSION_free(ss)
SSL_SESSION *ss;
{
int i;
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(ssl_session_meth,(char *)ss,&ss->ex_data);
memset(ss->key_arg,0,SSL_MAX_KEY_ARG_LENGTH);
memset(ss->master_key,0,SSL_MAX_MASTER_KEY_LENGTH);
memset(ss->session_id,0,SSL_MAX_SSL_SESSION_ID_LENGTH);
if (ss->cert != NULL) ssl_cert_free(ss->cert);
if (ss->peer != NULL) X509_free(ss->peer);
if (ss->ciphers != NULL) sk_free(ss->ciphers);
memset(ss,0,sizeof(*ss));
Free(ss);
}
int SSL_set_session(s, 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);
session->timeout=SSL_get_default_timeout(s);
}
/* 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;
/* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
ret=1;
}
else
{
if (s->session != NULL)
{
SSL_SESSION_free(s->session);
s->session=NULL;
}
}
return(ret);
}
long SSL_SESSION_set_timeout(s,t)
SSL_SESSION *s;
long t;
{
if (s == NULL) return(0);
s->timeout=t;
return(1);
}
long SSL_SESSION_get_timeout(s)
SSL_SESSION *s;
{
if (s == NULL) return(0);
return(s->timeout);
}
long SSL_SESSION_get_time(s)
SSL_SESSION *s;
{
if (s == NULL) return(0);
return(s->time);
}
long SSL_SESSION_set_time(s,t)
SSL_SESSION *s;
long t;
{
if (s == NULL) return(0);
s->time=t;
return(t);
}
typedef struct timeout_param_st
{
SSL_CTX *ctx;
long time;
LHASH *cache;
} TIMEOUT_PARAM;
static void timeout(s,p)
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,(char *)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);
}
}
void SSL_CTX_flush_sessions(s,t)
SSL_CTX *s;
long t;
{
unsigned long i;
TIMEOUT_PARAM tp;
tp.ctx=s;
tp.cache=SSL_CTX_sessions(s);
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,(void (*)())timeout,(char *)&tp);
tp.cache->down_load=i;
CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
}
int ssl_clear_bad_session(s)
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(ctx,s)
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(ctx,s)
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;
}
}
