ssl_sess.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/* 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
* 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 "ssl_locl.h"
/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
{
}
/* variant of SSL_get_session: caller really gets something */
{
/* 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. */
if(sess)
sess->references++;
return(sess);
}
{
}
{
}
{
}
SSL_SESSION *SSL_SESSION_new(void)
{
{
return(0);
}
ss->compress_meth=0;
return(ss);
}
* 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
unsigned int *id_len)
{
unsigned int retry = 0;
do
(++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;
}
{
/* This gets used by clients and servers. */
unsigned int tmp;
/* If the context has a default timeout, use it */
if (s->ctx->session_timeout == 0)
else
{
SSL_SESSION_free(s->session);
}
if (session)
{
if (s->version == SSL2_VERSION)
{
}
else if (s->version == SSL3_VERSION)
{
}
else if (s->version == TLS1_VERSION)
{
}
else
{
return(0);
}
/* Choose which callback will set the session ID */
if(s->generate_session_id)
cb = s->generate_session_id;
else if(s->ctx->generate_session_id)
/* Choose a session ID */
{
/* The callback failed */
return(0);
}
/* Don't allow the callback to set the session length to zero.
* nor set it higher than it was. */
{
/* The callback set an illegal length */
return(0);
}
/* If the session length was shrunk and we're SSLv2, pad it */
else
/* Finally, check for a conflict */
{
return(0);
}
}
else
{
ss->session_id_length=0;
}
{
return 0;
}
return(1);
}
{
/* This is used only by servers. */
int fatal = 0;
if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
goto err;
{
/* don't allow other threads to steal it: */
}
{
int copy=1;
!= NULL)
{
/* 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)
/* Add the externally cached session to the internal
* cache as well if and only if we are supposed to. */
/* The following should not return 1, otherwise,
* things are very strange */
}
goto err;
}
/* Now ret is non-NULL, and we own one of its reference counts. */
if((s->verify_mode&SSL_VERIFY_PEER)
{
/* We've found the session named by the client, but we don't
* want to use it in this context. */
if (s->sid_ctx_length == 0)
{
/* application should have used SSL[_CTX]_set_session_id_context
* -- we could tolerate this and just pretend we never heard
* of this session, but then applications could effectively
* disable the session cache by accident without anyone noticing */
fatal = 1;
goto err;
}
else
{
#if 0 /* The client cannot always know when a session is not appropriate,
* so we shouldn't generate an error message. */
#endif
goto err; /* treat like cache miss */
}
}
{
unsigned char buf[5],*p;
unsigned long l;
p=buf;
l2n(l,p);
else
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?. */
#endif
{
/* remove it from the cache */
goto err;
}
/* 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 :-) */
SSL_SESSION_free(s->session);
return(1);
err:
if (fatal)
return -1;
else
return 0;
}
{
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 */
/* if session c is in already in cache, we take back the increment later */
/* 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_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)
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) >
{
if (!remove_session_lock(ctx,
ctx->session_cache_tail, 0))
break;
else
}
}
}
return(ret);
}
{
}
{
SSL_SESSION *r;
int ret=0;
if ((c != NULL) && (c->session_id_length != 0))
{
{
ret=1;
}
if (ret)
{
r->not_resumable=1;
SSL_SESSION_free(r);
}
}
else
ret=0;
return(ret);
}
{
int i;
return;
#ifdef REF_PRINT
#endif
if (i > 0) return;
#ifdef REF_CHECK
if (i < 0)
{
abort(); /* ok */
}
#endif
}
{
int ret=0;
{
{
return(0);
}
{
if (!SSL_set_ssl_method(s,meth))
return(0);
if (s->ctx->session_timeout == 0)
else
}
#ifndef OPENSSL_NO_KRB5
session->krb5_client_princ_len > 0)
{
}
#endif /* OPENSSL_NO_KRB5 */
/* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
SSL_SESSION_free(s->session);
/* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
ret=1;
}
else
{
{
SSL_SESSION_free(s->session);
}
{
if (!SSL_set_ssl_method(s,meth))
return(0);
}
ret=1;
}
return(ret);
}
long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
{
if (s == NULL) return(0);
s->timeout=t;
return(1);
}
long SSL_SESSION_get_timeout(SSL_SESSION *s)
{
if (s == NULL) return(0);
return(s->timeout);
}
long SSL_SESSION_get_time(SSL_SESSION *s)
{
if (s == NULL) return(0);
return(s->time);
}
long SSL_SESSION_set_time(SSL_SESSION *s, long t)
{
if (s == NULL) return(0);
s->time=t;
return(t);
}
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);
}
long SSL_CTX_get_timeout(SSL_CTX *s)
{
if (s == NULL) return(0);
return(s->session_timeout);
}
typedef struct timeout_param_st
{
long time;
{
{
/* The reason we don't call SSL_CTX_remove_session() is to
* save on locking overhead */
SSL_SESSION_list_remove(p->ctx,s);
s->not_resumable=1;
SSL_SESSION_free(s);
}
}
void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
{
unsigned long i;
}
int ssl_clear_bad_session(SSL *s)
{
!(s->shutdown & SSL_SENT_SHUTDOWN) &&
!(SSL_in_init(s) || SSL_in_before(s)))
{
return(1);
}
else
return(0);
}
/* locked by SSL_CTX in the calling function */
{
{ /* last element in list */
{ /* only one element in list */
}
else
{
}
}
else
{
{ /* first element in list */
}
else
{ /* middle of list */
}
}
}
{
{
}
else
{
}
}