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ssl_sess.c
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/* $OpenBSD: ssl_sess.c,v 1.128 2024/07/22 14:47:15 jsing Exp $ */
/* 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.]
*/
/* ====================================================================
* Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
*
* 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 above 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 acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* ====================================================================
* Copyright 2005 Nokia. All rights reserved.
*
* The portions of the attached software ("Contribution") is developed by
* Nokia Corporation and is licensed pursuant to the OpenSSL open source
* license.
*
* The Contribution, originally written by Mika Kousa and Pasi Eronen of
* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
* support (see RFC 4279) to OpenSSL.
*
* No patent licenses or other rights except those expressly stated in
* the OpenSSL open source license shall be deemed granted or received
* expressly, by implication, estoppel, or otherwise.
*
* No assurances are provided by Nokia that the Contribution does not
* infringe the patent or other intellectual property rights of any third
* party or that the license provides you with all the necessary rights
* to make use of the Contribution.
*
* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
* OTHERWISE.
*/
#include <openssl/lhash.h>
#include <openssl/opensslconf.h>
#include "ssl_local.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);
/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
SSL_SESSION *
SSL_get_session(const SSL *ssl)
{
return (ssl->session);
}
LSSL_ALIAS(SSL_get_session);
/* variant of SSL_get_session: caller really gets something */
SSL_SESSION *
SSL_get1_session(SSL *ssl)
{
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);
}
LSSL_ALIAS(SSL_get1_session);
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);
}
LSSL_ALIAS(SSL_SESSION_get_ex_new_index);
int
SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
{
return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
}
LSSL_ALIAS(SSL_SESSION_set_ex_data);
void *
SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
{
return (CRYPTO_get_ex_data(&s->ex_data, idx));
}
LSSL_ALIAS(SSL_SESSION_get_ex_data);
uint32_t
SSL_SESSION_get_max_early_data(const SSL_SESSION *s)
{
return 0;
}
LSSL_ALIAS(SSL_SESSION_get_max_early_data);
int
SSL_SESSION_set_max_early_data(SSL_SESSION *s, uint32_t max_early_data)
{
return 1;
}
LSSL_ALIAS(SSL_SESSION_set_max_early_data);
SSL_SESSION *
SSL_SESSION_new(void)
{
SSL_SESSION *ss;
if (!OPENSSL_init_ssl(0, NULL)) {
SSLerrorx(SSL_R_LIBRARY_BUG);
return(NULL);
}
if ((ss = calloc(1, sizeof(*ss))) == NULL) {
SSLerrorx(ERR_R_MALLOC_FAILURE);
return (NULL);
}
ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
ss->references = 1;
ss->timeout = 60 * 5 + 4; /* 5 minutes 4 seconds timeout by default */
ss->time = time(NULL);
ss->prev = NULL;
ss->next = NULL;
ss->tlsext_hostname = NULL;
ss->peer_cert_type = -1;
ss->tlsext_ecpointformatlist_length = 0;
ss->tlsext_ecpointformatlist = NULL;
ss->tlsext_supportedgroups_length = 0;
ss->tlsext_supportedgroups = NULL;
CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
return (ss);
}
LSSL_ALIAS(SSL_SESSION_new);
SSL_SESSION *
ssl_session_dup(SSL_SESSION *sess, int include_ticket)
{
SSL_SESSION *copy;
CBS cbs;
if ((copy = calloc(1, sizeof(*copy))) == NULL) {
SSLerrorx(ERR_R_MALLOC_FAILURE);
goto err;
}
copy->ssl_version = sess->ssl_version;
CBS_init(&cbs, sess->master_key, sess->master_key_length);
if (!CBS_write_bytes(&cbs, copy->master_key, sizeof(copy->master_key),
©->master_key_length))
goto err;
CBS_init(&cbs, sess->session_id, sess->session_id_length);
if (!CBS_write_bytes(&cbs, copy->session_id, sizeof(copy->session_id),
©->session_id_length))
goto err;
CBS_init(&cbs, sess->sid_ctx, sess->sid_ctx_length);
if (!CBS_write_bytes(&cbs, copy->sid_ctx, sizeof(copy->sid_ctx),
©->sid_ctx_length))
goto err;
if (sess->peer_cert != NULL) {
if (!X509_up_ref(sess->peer_cert))
goto err;
copy->peer_cert = sess->peer_cert;
}
copy->peer_cert_type = sess->peer_cert_type;
copy->verify_result = sess->verify_result;
copy->timeout = sess->timeout;
copy->time = sess->time;
copy->references = 1;
copy->cipher_value = sess->cipher_value;
if (sess->tlsext_hostname != NULL) {
copy->tlsext_hostname = strdup(sess->tlsext_hostname);
if (copy->tlsext_hostname == NULL)
goto err;
}
if (include_ticket) {
CBS_init(&cbs, sess->tlsext_tick, sess->tlsext_ticklen);
if (!CBS_stow(&cbs, ©->tlsext_tick, ©->tlsext_ticklen))
goto err;
copy->tlsext_tick_lifetime_hint =
sess->tlsext_tick_lifetime_hint;
/*
* XXX - copy sess->resumption_master_secret and all other
* TLSv1.3 info here.
*/
}
if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, copy,
©->ex_data))
goto err;
if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ©->ex_data,
&sess->ex_data))
goto err;
/* Omit prev/next: the new session gets its own slot in the cache. */
copy->not_resumable = sess->not_resumable;
CBS_init(&cbs, sess->tlsext_ecpointformatlist,
sess->tlsext_ecpointformatlist_length);
if (!CBS_stow(&cbs, ©->tlsext_ecpointformatlist,
©->tlsext_ecpointformatlist_length))
goto err;
if (sess->tlsext_supportedgroups != NULL) {
if ((copy->tlsext_supportedgroups = calloc(sizeof(uint16_t),
sess->tlsext_supportedgroups_length)) == NULL)
goto err;
memcpy(copy->tlsext_supportedgroups,
sess->tlsext_supportedgroups,
sizeof(uint16_t) * sess->tlsext_supportedgroups_length);
copy->tlsext_supportedgroups_length =
sess->tlsext_supportedgroups_length;
}
return copy;
err:
SSL_SESSION_free(copy);
return NULL;
}
const unsigned char *
SSL_SESSION_get_id(const SSL_SESSION *ss, unsigned int *len)
{
if (len != NULL)
*len = (unsigned int)ss->session_id_length;
return ss->session_id;
}
LSSL_ALIAS(SSL_SESSION_get_id);
const unsigned char *
SSL_SESSION_get0_id_context(const SSL_SESSION *ss, unsigned int *len)
{
if (len != NULL)
*len = (unsigned int)ss->sid_ctx_length;
return ss->sid_ctx;
}
LSSL_ALIAS(SSL_SESSION_get0_id_context);
unsigned int
SSL_SESSION_get_compress_id(const SSL_SESSION *ss)
{
return 0;
}
LSSL_ALIAS(SSL_SESSION_get_compress_id);
unsigned long
SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s)
{
return s->tlsext_tick_lifetime_hint;
}
LSSL_ALIAS(SSL_SESSION_get_ticket_lifetime_hint);
int
SSL_SESSION_has_ticket(const SSL_SESSION *s)
{
return (s->tlsext_ticklen > 0) ? 1 : 0;
}
LSSL_ALIAS(SSL_SESSION_has_ticket);
/*
* SSLv3/TLSv1 has 32 bytes (256 bits) of session ID space. 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
* arc4random 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 {
arc4random_buf(id, *id_len);
} 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)
{
unsigned int tmp;
SSL_SESSION *ss = NULL;
GEN_SESSION_CB cb = def_generate_session_id;
/* This gets used by clients and servers. */
if ((ss = SSL_SESSION_new()) == NULL)
return (0);
/* If the context has a default timeout, use it */
if (s->session_ctx->session_timeout == 0)
ss->timeout = SSL_get_default_timeout(s);
else
ss->timeout = s->session_ctx->session_timeout;
if (s->session != NULL) {
SSL_SESSION_free(s->session);
s->session = NULL;
}
if (session) {
switch (s->version) {
case TLS1_VERSION:
case TLS1_1_VERSION:
case TLS1_2_VERSION:
case DTLS1_VERSION:
case DTLS1_2_VERSION:
ss->ssl_version = s->version;
ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
break;
default:
SSLerror(s, SSL_R_UNSUPPORTED_SSL_VERSION);
SSL_SESSION_free(ss);
return (0);
}
/* If RFC4507 ticket use empty session ID. */
if (s->tlsext_ticket_expected) {
ss->session_id_length = 0;
goto sess_id_done;
}
/* 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->session_ctx->generate_session_id)
cb = s->session_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 */
SSLerror(s, 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 == 0 || tmp > ss->session_id_length) {
/* The callback set an illegal length */
SSLerror(s, SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
SSL_SESSION_free(ss);
return (0);
}
ss->session_id_length = tmp;
/* Finally, check for a conflict. */
if (SSL_has_matching_session_id(s, ss->session_id,
ss->session_id_length)) {
SSLerror(s, SSL_R_SSL_SESSION_ID_CONFLICT);
SSL_SESSION_free(ss);
return (0);
}
sess_id_done:
if (s->tlsext_hostname) {
ss->tlsext_hostname = strdup(s->tlsext_hostname);
if (ss->tlsext_hostname == NULL) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
SSL_SESSION_free(ss);
return 0;
}
}
} else {
ss->session_id_length = 0;
}
if (s->sid_ctx_length > sizeof ss->sid_ctx) {
SSLerror(s, 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);
}
static SSL_SESSION *
ssl_session_from_cache(SSL *s, CBS *session_id)
{
SSL_SESSION *sess;
SSL_SESSION data;
if ((s->session_ctx->session_cache_mode &
SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
return NULL;
memset(&data, 0, sizeof(data));
data.ssl_version = s->version;
if (!CBS_write_bytes(session_id, data.session_id,
sizeof(data.session_id), &data.session_id_length))
return NULL;
CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
sess = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data);
if (sess != NULL)
CRYPTO_add(&sess->references, 1, CRYPTO_LOCK_SSL_SESSION);
CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
if (sess == NULL)
s->session_ctx->stats.sess_miss++;
return sess;
}
static SSL_SESSION *
ssl_session_from_callback(SSL *s, CBS *session_id)
{
SSL_SESSION *sess;
int copy;
if (s->session_ctx->get_session_cb == NULL)
return NULL;
copy = 1;
if ((sess = s->session_ctx->get_session_cb(s,
CBS_data(session_id), CBS_len(session_id), ©)) == NULL)
return NULL;
/*
* The copy handler may have set copy == 0 to indicate that the session
* structures are shared between threads and that it handles the
* reference count itself. If it didn't set copy to zero, we must
* increment the reference count.
*/
if (copy)
CRYPTO_add(&sess->references, 1, CRYPTO_LOCK_SSL_SESSION);
s->session_ctx->stats.sess_cb_hit++;
/* Add the externally cached session to the internal cache as well. */
if (!(s->session_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->session_ctx, sess);
}
return sess;
}
static SSL_SESSION *
ssl_session_by_id(SSL *s, CBS *session_id)
{
SSL_SESSION *sess;
if (CBS_len(session_id) == 0)
return NULL;
if ((sess = ssl_session_from_cache(s, session_id)) == NULL)
sess = ssl_session_from_callback(s, session_id);
return sess;
}
/*
* ssl_get_prev_session attempts to find an SSL_SESSION to be used to resume
* this connection. It is only called by servers.
*
* session_id: points at the session ID in the ClientHello. This code will
* read past the end of this in order to parse out the session ticket
* extension, if any.
* ext_block: a CBS for the ClientHello extensions block.
* alert: alert that the caller should send in case of failure.
*
* Returns:
* -1: error
* 0: a session may have been found.
*
* Side effects:
* - If a session is found then s->session is pointed at it (after freeing
* an existing session if need be) and s->verify_result is set from the
* session.
* - For both new and resumed sessions, s->tlsext_ticket_expected
* indicates whether the server should issue a new session ticket or not.
*/
int
ssl_get_prev_session(SSL *s, CBS *session_id, CBS *ext_block, int *alert)
{
SSL_SESSION *sess = NULL;
int alert_desc = SSL_AD_INTERNAL_ERROR, fatal = 0;
int ticket_decrypted = 0;
/* This is used only by servers. */
if (CBS_len(session_id) > SSL_MAX_SSL_SESSION_ID_LENGTH)
goto err;
/* Sets s->tlsext_ticket_expected. */
switch (tls1_process_ticket(s, ext_block, &alert_desc, &sess)) {
case TLS1_TICKET_FATAL_ERROR:
fatal = 1;
goto err;
case TLS1_TICKET_NONE:
case TLS1_TICKET_EMPTY:
if ((sess = ssl_session_by_id(s, session_id)) == NULL)
goto err;
break;
case TLS1_TICKET_NOT_DECRYPTED:
goto err;
case TLS1_TICKET_DECRYPTED:
ticket_decrypted = 1;
/*
* The session ID is used by some clients to detect that the
* ticket has been accepted so we copy it into sess.
*/
if (!CBS_write_bytes(session_id, sess->session_id,
sizeof(sess->session_id), &sess->session_id_length)) {
fatal = 1;
goto err;
}
break;
default:
SSLerror(s, ERR_R_INTERNAL_ERROR);
fatal = 1;
goto err;
}
/* Now sess is non-NULL and we own one of its reference counts. */
if (sess->sid_ctx_length != s->sid_ctx_length ||
timingsafe_memcmp(sess->sid_ctx, s->sid_ctx,
sess->sid_ctx_length) != 0) {
/*
* We have the session requested by the client, but we don't
* want to use it in this context. Treat it like a cache miss.
*/
goto err;
}
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).
*/
SSLerror(s, SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
fatal = 1;
goto err;
}
if (sess->timeout < (time(NULL) - sess->time)) {
s->session_ctx->stats.sess_timeout++;
if (!ticket_decrypted) {
/* The session was from the cache, so remove it. */
SSL_CTX_remove_session(s->session_ctx, sess);
}
goto err;
}
s->session_ctx->stats.sess_hit++;
SSL_SESSION_free(s->session);
s->session = sess;
s->verify_result = s->session->verify_result;
return 1;
err:
SSL_SESSION_free(sess);
if (ticket_decrypted) {
/*
* The session was from a ticket. Issue a ticket for the new
* session.
*/
s->tlsext_ticket_expected = 1;
}
if (fatal) {
*alert = alert_desc;
return -1;
}
return 0;
}
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 = lh_SSL_SESSION_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);
}
LSSL_ALIAS(SSL_CTX_add_session);
int
SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
{
return remove_session_lock(ctx, c, 1);
}
LSSL_ALIAS(SSL_CTX_remove_session);
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)
return 0;
if (lck)
CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) == c) {
ret = 1;
r = lh_SSL_SESSION_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);
}
return ret;
}
void
SSL_SESSION_free(SSL_SESSION *ss)
{
int i;
if (ss == NULL)
return;
i = CRYPTO_add(&ss->references, -1, CRYPTO_LOCK_SSL_SESSION);
if (i > 0)
return;
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
explicit_bzero(ss->master_key, sizeof ss->master_key);
explicit_bzero(ss->session_id, sizeof ss->session_id);
X509_free(ss->peer_cert);
free(ss->tlsext_hostname);
free(ss->tlsext_tick);
free(ss->tlsext_ecpointformatlist);
free(ss->tlsext_supportedgroups);
tls13_secret_cleanup(&ss->resumption_master_secret);
freezero(ss, sizeof(*ss));
}
LSSL_ALIAS(SSL_SESSION_free);
int
SSL_SESSION_up_ref(SSL_SESSION *ss)
{
return CRYPTO_add(&ss->references, 1, CRYPTO_LOCK_SSL_SESSION) > 1;
}
LSSL_ALIAS(SSL_SESSION_up_ref);
int
SSL_set_session(SSL *s, SSL_SESSION *session)
{
const SSL_METHOD *method;
if (session == NULL) {
SSL_SESSION_free(s->session);
s->session = NULL;
return SSL_set_ssl_method(s, s->ctx->method);
}
if ((method = ssl_get_method(session->ssl_version)) == NULL) {
SSLerror(s, SSL_R_UNABLE_TO_FIND_SSL_METHOD);
return (0);
}
if (!SSL_set_ssl_method(s, method))
return (0);
CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
SSL_SESSION_free(s->session);
s->session = session;
s->verify_result = s->session->verify_result;
return (1);
}
LSSL_ALIAS(SSL_set_session);
size_t
SSL_SESSION_get_master_key(const SSL_SESSION *ss, unsigned char *out,
size_t max_out)
{
size_t len = ss->master_key_length;
if (out == NULL)
return len;
if (len > max_out)
len = max_out;
memcpy(out, ss->master_key, len);
return len;
}
LSSL_ALIAS(SSL_SESSION_get_master_key);
long
SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
{
if (s == NULL)
return (0);
s->timeout = t;
return (1);
}
LSSL_ALIAS(SSL_SESSION_set_timeout);
long
SSL_SESSION_get_timeout(const SSL_SESSION *s)
{
if (s == NULL)
return (0);
return (s->timeout);
}
LSSL_ALIAS(SSL_SESSION_get_timeout);
/* XXX 2038 */
long
SSL_SESSION_get_time(const SSL_SESSION *s)
{
if (s == NULL)
return (0);
return (s->time);
}
LSSL_ALIAS(SSL_SESSION_get_time);
/* XXX 2038 */
long
SSL_SESSION_set_time(SSL_SESSION *s, long t)
{
if (s == NULL)
return (0);
s->time = t;
return (t);
}
LSSL_ALIAS(SSL_SESSION_set_time);
int
SSL_SESSION_get_protocol_version(const SSL_SESSION *s)
{
return s->ssl_version;
}
LSSL_ALIAS(SSL_SESSION_get_protocol_version);
const SSL_CIPHER *
SSL_SESSION_get0_cipher(const SSL_SESSION *s)
{
return ssl3_get_cipher_by_value(s->cipher_value);
}
LSSL_ALIAS(SSL_SESSION_get0_cipher);
X509 *
SSL_SESSION_get0_peer(SSL_SESSION *s)
{
return s->peer_cert;
}
LSSL_ALIAS(SSL_SESSION_get0_peer);
int
SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
unsigned int sid_len)