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- /*
- * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
- * Copyright 2005 Nokia. All rights reserved.
- *
- * Licensed under the Apache License 2.0 (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- #if defined(__TANDEM) && defined(_SPT_MODEL_)
- # include <spthread.h>
- # include <spt_extensions.h> /* timeval */
- #endif
- #include <stdio.h>
- #include <openssl/rand.h>
- #include <openssl/engine.h>
- #include "internal/refcount.h"
- #include "internal/cryptlib.h"
- #include "ssl_local.h"
- #include "statem/statem_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);
- DEFINE_STACK_OF(SSL_SESSION)
- __owur static ossl_inline int sess_timedout(OSSL_TIME t, SSL_SESSION *ss)
- {
- return ossl_time_compare(t, ss->calc_timeout) > 0;
- }
- /*
- * Returns -1/0/+1 as other XXXcmp-type functions
- * Takes calculated timeout into consideration
- */
- __owur static ossl_inline int timeoutcmp(SSL_SESSION *a, SSL_SESSION *b)
- {
- return ossl_time_compare(a->calc_timeout, b->calc_timeout);
- }
- /*
- * Calculates effective timeout
- * Locking must be done by the caller of this function
- */
- void ssl_session_calculate_timeout(SSL_SESSION *ss)
- {
- ss->calc_timeout = ossl_time_add(ss->time, ss->timeout);
- }
- /*
- * SSL_get_session() and SSL_get1_session() are problematic in TLS1.3 because,
- * unlike in earlier protocol versions, the session ticket may not have been
- * sent yet even though a handshake has finished. The session ticket data could
- * come in sometime later...or even change if multiple session ticket messages
- * are sent from the server. The preferred way for applications to obtain
- * a resumable session is to use SSL_CTX_sess_set_new_cb().
- */
- SSL_SESSION *SSL_get_session(const SSL *ssl)
- /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
- {
- const SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(ssl);
- if (sc == NULL)
- return NULL;
- return sc->session;
- }
- 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.
- */
- if (!CRYPTO_THREAD_read_lock(ssl->lock))
- return NULL;
- sess = SSL_get_session(ssl);
- if (sess != NULL)
- SSL_SESSION_up_ref(sess);
- CRYPTO_THREAD_unlock(ssl->lock);
- return sess;
- }
- int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
- {
- return CRYPTO_set_ex_data(&s->ex_data, idx, arg);
- }
- void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
- {
- return CRYPTO_get_ex_data(&s->ex_data, idx);
- }
- SSL_SESSION *SSL_SESSION_new(void)
- {
- SSL_SESSION *ss;
- if (!OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL))
- return NULL;
- ss = OPENSSL_zalloc(sizeof(*ss));
- if (ss == NULL)
- return NULL;
- ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
- /* 5 minute timeout by default */
- ss->timeout = ossl_seconds2time(60 * 5 + 4);
- ss->time = ossl_time_now();
- ssl_session_calculate_timeout(ss);
- if (!CRYPTO_NEW_REF(&ss->references, 1)) {
- OPENSSL_free(ss);
- return NULL;
- }
- if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data)) {
- CRYPTO_FREE_REF(&ss->references);
- OPENSSL_free(ss);
- return NULL;
- }
- return ss;
- }
- SSL_SESSION *SSL_SESSION_dup(const SSL_SESSION *src)
- {
- return ssl_session_dup(src, 1);
- }
- /*
- * Create a new SSL_SESSION and duplicate the contents of |src| into it. If
- * ticket == 0 then no ticket information is duplicated, otherwise it is.
- */
- SSL_SESSION *ssl_session_dup(const SSL_SESSION *src, int ticket)
- {
- SSL_SESSION *dest;
- dest = OPENSSL_malloc(sizeof(*dest));
- if (dest == NULL)
- return NULL;
- memcpy(dest, src, sizeof(*dest));
- /*
- * Set the various pointers to NULL so that we can call SSL_SESSION_free in
- * the case of an error whilst halfway through constructing dest
- */
- #ifndef OPENSSL_NO_PSK
- dest->psk_identity_hint = NULL;
- dest->psk_identity = NULL;
- #endif
- dest->ext.hostname = NULL;
- dest->ext.tick = NULL;
- dest->ext.alpn_selected = NULL;
- #ifndef OPENSSL_NO_SRP
- dest->srp_username = NULL;
- #endif
- dest->peer_chain = NULL;
- dest->peer = NULL;
- dest->peer_rpk = NULL;
- dest->ticket_appdata = NULL;
- memset(&dest->ex_data, 0, sizeof(dest->ex_data));
- /* As the copy is not in the cache, we remove the associated pointers */
- dest->prev = NULL;
- dest->next = NULL;
- dest->owner = NULL;
- if (!CRYPTO_NEW_REF(&dest->references, 1)) {
- OPENSSL_free(dest);
- return NULL;
- }
- if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, dest, &dest->ex_data)) {
- ERR_raise(ERR_LIB_SSL, ERR_R_CRYPTO_LIB);
- goto err;
- }
- if (src->peer != NULL) {
- if (!X509_up_ref(src->peer)) {
- ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
- goto err;
- }
- dest->peer = src->peer;
- }
- if (src->peer_chain != NULL) {
- dest->peer_chain = X509_chain_up_ref(src->peer_chain);
- if (dest->peer_chain == NULL) {
- ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
- goto err;
- }
- }
- if (src->peer_rpk != NULL) {
- if (!EVP_PKEY_up_ref(src->peer_rpk))
- goto err;
- dest->peer_rpk = src->peer_rpk;
- }
- #ifndef OPENSSL_NO_PSK
- if (src->psk_identity_hint) {
- dest->psk_identity_hint = OPENSSL_strdup(src->psk_identity_hint);
- if (dest->psk_identity_hint == NULL)
- goto err;
- }
- if (src->psk_identity) {
- dest->psk_identity = OPENSSL_strdup(src->psk_identity);
- if (dest->psk_identity == NULL)
- goto err;
- }
- #endif
- if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL_SESSION,
- &dest->ex_data, &src->ex_data)) {
- ERR_raise(ERR_LIB_SSL, ERR_R_CRYPTO_LIB);
- goto err;
- }
- if (src->ext.hostname) {
- dest->ext.hostname = OPENSSL_strdup(src->ext.hostname);
- if (dest->ext.hostname == NULL)
- goto err;
- }
- if (ticket != 0 && src->ext.tick != NULL) {
- dest->ext.tick =
- OPENSSL_memdup(src->ext.tick, src->ext.ticklen);
- if (dest->ext.tick == NULL)
- goto err;
- } else {
- dest->ext.tick_lifetime_hint = 0;
- dest->ext.ticklen = 0;
- }
- if (src->ext.alpn_selected != NULL) {
- dest->ext.alpn_selected = OPENSSL_memdup(src->ext.alpn_selected,
- src->ext.alpn_selected_len);
- if (dest->ext.alpn_selected == NULL)
- goto err;
- }
- #ifndef OPENSSL_NO_SRP
- if (src->srp_username) {
- dest->srp_username = OPENSSL_strdup(src->srp_username);
- if (dest->srp_username == NULL)
- goto err;
- }
- #endif
- if (src->ticket_appdata != NULL) {
- dest->ticket_appdata =
- OPENSSL_memdup(src->ticket_appdata, src->ticket_appdata_len);
- if (dest->ticket_appdata == NULL)
- goto err;
- }
- return dest;
- err:
- SSL_SESSION_free(dest);
- return NULL;
- }
- const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
- {
- if (len)
- *len = (unsigned int)s->session_id_length;
- return s->session_id;
- }
- const unsigned char *SSL_SESSION_get0_id_context(const SSL_SESSION *s,
- unsigned int *len)
- {
- if (len != NULL)
- *len = (unsigned int)s->sid_ctx_length;
- return s->sid_ctx;
- }
- unsigned int SSL_SESSION_get_compress_id(const SSL_SESSION *s)
- {
- return s->compress_meth;
- }
- /*
- * SSLv3/TLSv1 has 32 bytes (256 bits) of session ID space. As such, filling
- * the ID with random junk 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
- * 2^256 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(SSL *ssl, unsigned char *id,
- unsigned int *id_len)
- {
- unsigned int retry = 0;
- do {
- if (RAND_bytes_ex(ssl->ctx->libctx, id, *id_len, 0) <= 0)
- return 0;
- #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
- if (retry > 0) {
- id[0]++;
- }
- #endif
- } 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_generate_session_id(SSL_CONNECTION *s, SSL_SESSION *ss)
- {
- unsigned int tmp;
- GEN_SESSION_CB cb = def_generate_session_id;
- SSL *ssl = SSL_CONNECTION_GET_SSL(s);
- switch (s->version) {
- case SSL3_VERSION:
- case TLS1_VERSION:
- case TLS1_1_VERSION:
- case TLS1_2_VERSION:
- case TLS1_3_VERSION:
- case DTLS1_BAD_VER:
- case DTLS1_VERSION:
- case DTLS1_2_VERSION:
- ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
- break;
- default:
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_UNSUPPORTED_SSL_VERSION);
- return 0;
- }
- /*-
- * If RFC5077 ticket, use empty session ID (as server).
- * Note that:
- * (a) ssl_get_prev_session() does lookahead into the
- * ClientHello extensions to find the session ticket.
- * When ssl_get_prev_session() fails, statem_srvr.c calls
- * ssl_get_new_session() in tls_process_client_hello().
- * At that point, it has not yet parsed the extensions,
- * however, because of the lookahead, it already knows
- * whether a ticket is expected or not.
- *
- * (b) statem_clnt.c calls ssl_get_new_session() before parsing
- * ServerHello extensions, and before recording the session
- * ID received from the server, so this block is a noop.
- */
- if (s->ext.ticket_expected) {
- ss->session_id_length = 0;
- return 1;
- }
- /* Choose which callback will set the session ID */
- if (!CRYPTO_THREAD_read_lock(SSL_CONNECTION_GET_SSL(s)->lock))
- return 0;
- if (!CRYPTO_THREAD_read_lock(s->session_ctx->lock)) {
- CRYPTO_THREAD_unlock(ssl->lock);
- SSLfatal(s, SSL_AD_INTERNAL_ERROR,
- SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
- return 0;
- }
- 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_THREAD_unlock(s->session_ctx->lock);
- CRYPTO_THREAD_unlock(ssl->lock);
- /* Choose a session ID */
- memset(ss->session_id, 0, ss->session_id_length);
- tmp = (int)ss->session_id_length;
- if (!cb(ssl, ss->session_id, &tmp)) {
- /* The callback failed */
- SSLfatal(s, SSL_AD_INTERNAL_ERROR,
- SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
- 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 */
- SSLfatal(s, SSL_AD_INTERNAL_ERROR,
- SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
- return 0;
- }
- ss->session_id_length = tmp;
- /* Finally, check for a conflict */
- if (SSL_has_matching_session_id(ssl, ss->session_id,
- (unsigned int)ss->session_id_length)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_SSL_SESSION_ID_CONFLICT);
- return 0;
- }
- return 1;
- }
- int ssl_get_new_session(SSL_CONNECTION *s, int session)
- {
- /* This gets used by clients and servers. */
- SSL_SESSION *ss = NULL;
- if ((ss = SSL_SESSION_new()) == NULL) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_SSL_LIB);
- return 0;
- }
- /* If the context has a default timeout, use it */
- if (ossl_time_is_zero(s->session_ctx->session_timeout))
- ss->timeout = SSL_CONNECTION_GET_SSL(s)->method->get_timeout();
- else
- ss->timeout = s->session_ctx->session_timeout;
- ssl_session_calculate_timeout(ss);
- SSL_SESSION_free(s->session);
- s->session = NULL;
- if (session) {
- if (SSL_CONNECTION_IS_TLS13(s)) {
- /*
- * We generate the session id while constructing the
- * NewSessionTicket in TLSv1.3.
- */
- ss->session_id_length = 0;
- } else if (!ssl_generate_session_id(s, ss)) {
- /* SSLfatal() already called */
- SSL_SESSION_free(ss);
- return 0;
- }
- } else {
- ss->session_id_length = 0;
- }
- if (s->sid_ctx_length > sizeof(ss->sid_ctx)) {
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, 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;
- /* If client supports extended master secret set it in session */
- if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS)
- ss->flags |= SSL_SESS_FLAG_EXTMS;
- return 1;
- }
- SSL_SESSION *lookup_sess_in_cache(SSL_CONNECTION *s,
- const unsigned char *sess_id,
- size_t sess_id_len)
- {
- SSL_SESSION *ret = NULL;
- if ((s->session_ctx->session_cache_mode
- & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP) == 0) {
- SSL_SESSION data;
- data.ssl_version = s->version;
- if (!ossl_assert(sess_id_len <= SSL_MAX_SSL_SESSION_ID_LENGTH))
- return NULL;
- memcpy(data.session_id, sess_id, sess_id_len);
- data.session_id_length = sess_id_len;
- if (!CRYPTO_THREAD_read_lock(s->session_ctx->lock))
- return NULL;
- ret = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data);
- if (ret != NULL) {
- /* don't allow other threads to steal it: */
- SSL_SESSION_up_ref(ret);
- }
- CRYPTO_THREAD_unlock(s->session_ctx->lock);
- if (ret == NULL)
- ssl_tsan_counter(s->session_ctx, &s->session_ctx->stats.sess_miss);
- }
- if (ret == NULL && s->session_ctx->get_session_cb != NULL) {
- int copy = 1;
- ret = s->session_ctx->get_session_cb(SSL_CONNECTION_GET_SSL(s),
- sess_id, sess_id_len, ©);
- if (ret != NULL) {
- ssl_tsan_counter(s->session_ctx,
- &s->session_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)
- SSL_SESSION_up_ref(ret);
- /*
- * Add the externally cached session to the internal cache as
- * well if and only if we are supposed to.
- */
- if ((s->session_ctx->session_cache_mode &
- SSL_SESS_CACHE_NO_INTERNAL_STORE) == 0) {
- /*
- * Either return value of SSL_CTX_add_session should not
- * interrupt the session resumption process. The return
- * value is intentionally ignored.
- */
- (void)SSL_CTX_add_session(s->session_ctx, ret);
- }
- }
- }
- return ret;
- }
- /*-
- * ssl_get_prev attempts to find an SSL_SESSION to be used to resume this
- * connection. It is only called by servers.
- *
- * hello: The parsed ClientHello data
- *
- * Returns:
- * -1: fatal error
- * 0: no session found
- * 1: 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.
- * - Both for new and resumed sessions, s->ext.ticket_expected is set to 1
- * if the server should issue a new session ticket (to 0 otherwise).
- */
- int ssl_get_prev_session(SSL_CONNECTION *s, CLIENTHELLO_MSG *hello)
- {
- /* This is used only by servers. */
- SSL_SESSION *ret = NULL;
- int fatal = 0;
- int try_session_cache = 0;
- SSL_TICKET_STATUS r;
- if (SSL_CONNECTION_IS_TLS13(s)) {
- /*
- * By default we will send a new ticket. This can be overridden in the
- * ticket processing.
- */
- s->ext.ticket_expected = 1;
- if (!tls_parse_extension(s, TLSEXT_IDX_psk_kex_modes,
- SSL_EXT_CLIENT_HELLO, hello->pre_proc_exts,
- NULL, 0)
- || !tls_parse_extension(s, TLSEXT_IDX_psk, SSL_EXT_CLIENT_HELLO,
- hello->pre_proc_exts, NULL, 0))
- return -1;
- ret = s->session;
- } else {
- /* sets s->ext.ticket_expected */
- r = tls_get_ticket_from_client(s, hello, &ret);
- switch (r) {
- case SSL_TICKET_FATAL_ERR_MALLOC:
- case SSL_TICKET_FATAL_ERR_OTHER:
- fatal = 1;
- SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
- goto err;
- case SSL_TICKET_NONE:
- case SSL_TICKET_EMPTY:
- if (hello->session_id_len > 0) {
- try_session_cache = 1;
- ret = lookup_sess_in_cache(s, hello->session_id,
- hello->session_id_len);
- }
- break;
- case SSL_TICKET_NO_DECRYPT:
- case SSL_TICKET_SUCCESS:
- case SSL_TICKET_SUCCESS_RENEW:
- break;
- }
- }
- if (ret == NULL)
- goto err;
- /* Now ret is non-NULL and we own one of its reference counts. */
- /* Check TLS version consistency */
- if (ret->ssl_version != s->version)
- goto err;
- if (ret->sid_ctx_length != s->sid_ctx_length
- || memcmp(ret->sid_ctx, s->sid_ctx, ret->sid_ctx_length)) {
- /*
- * We have the session requested by the client, but we don't want to
- * use it in this context.
- */
- 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).
- */
- SSLfatal(s, SSL_AD_INTERNAL_ERROR,
- SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
- fatal = 1;
- goto err;
- }
- if (sess_timedout(ossl_time_now(), ret)) {
- ssl_tsan_counter(s->session_ctx, &s->session_ctx->stats.sess_timeout);
- if (try_session_cache) {
- /* session was from the cache, so remove it */
- SSL_CTX_remove_session(s->session_ctx, ret);
- }
- goto err;
- }
- /* Check extended master secret extension consistency */
- if (ret->flags & SSL_SESS_FLAG_EXTMS) {
- /* If old session includes extms, but new does not: abort handshake */
- if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS)) {
- SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_INCONSISTENT_EXTMS);
- fatal = 1;
- goto err;
- }
- } else if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) {
- /* If new session includes extms, but old does not: do not resume */
- goto err;
- }
- if (!SSL_CONNECTION_IS_TLS13(s)) {
- /* We already did this for TLS1.3 */
- SSL_SESSION_free(s->session);
- s->session = ret;
- }
- ssl_tsan_counter(s->session_ctx, &s->session_ctx->stats.sess_hit);
- s->verify_result = s->session->verify_result;
- return 1;
- err:
- if (ret != NULL) {
- SSL_SESSION_free(ret);
- /* In TLSv1.3 s->session was already set to ret, so we NULL it out */
- if (SSL_CONNECTION_IS_TLS13(s))
- s->session = NULL;
- if (!try_session_cache) {
- /*
- * The session was from a ticket, so we should issue a ticket for
- * the new session
- */
- s->ext.ticket_expected = 1;
- }
- }
- if (fatal)
- 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
- */
- SSL_SESSION_up_ref(c);
- /*
- * if session c is in already in cache, we take back the increment later
- */
- if (!CRYPTO_THREAD_write_lock(ctx->lock)) {
- SSL_SESSION_free(c);
- return 0;
- }
- 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;
- } else if (s == NULL &&
- lh_SSL_SESSION_retrieve(ctx->sessions, c) == NULL) {
- /* s == NULL can also mean OOM error in lh_SSL_SESSION_insert ... */
- /*
- * ... so take back the extra reference and also don't add
- * the session to the SSL_SESSION_list at this time
- */
- s = c;
- }
- /* Adjust last used time, and add back into the cache at the appropriate spot */
- if (ctx->session_cache_mode & SSL_SESS_CACHE_UPDATE_TIME) {
- c->time = ossl_time_now();
- ssl_session_calculate_timeout(c);
- }
- if (s == NULL) {
- /*
- * new cache entry -- remove old ones if cache has become too large
- * delete cache entry *before* add, so we don't remove the one we're adding!
- */
- 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
- ssl_tsan_counter(ctx, &ctx->stats.sess_cache_full);
- }
- }
- }
- 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;
- }
- CRYPTO_THREAD_unlock(ctx->lock);
- return ret;
- }
- 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) {
- if (!CRYPTO_THREAD_write_lock(ctx->lock))
- return 0;
- }
- if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) != NULL) {
- ret = 1;
- r = lh_SSL_SESSION_delete(ctx->sessions, r);
- SSL_SESSION_list_remove(ctx, r);
- }
- c->not_resumable = 1;
- if (lck)
- CRYPTO_THREAD_unlock(ctx->lock);
- if (ctx->remove_session_cb != NULL)
- ctx->remove_session_cb(ctx, c);
- if (ret)
- SSL_SESSION_free(r);
- }
- return ret;
- }
- void SSL_SESSION_free(SSL_SESSION *ss)
- {
- int i;
- if (ss == NULL)
- return;
- CRYPTO_DOWN_REF(&ss->references, &i);
- REF_PRINT_COUNT("SSL_SESSION", ss);
- if (i > 0)
- return;
- REF_ASSERT_ISNT(i < 0);
- CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
- OPENSSL_cleanse(ss->master_key, sizeof(ss->master_key));
- OPENSSL_cleanse(ss->session_id, sizeof(ss->session_id));
- X509_free(ss->peer);
- EVP_PKEY_free(ss->peer_rpk);
- OSSL_STACK_OF_X509_free(ss->peer_chain);
- OPENSSL_free(ss->ext.hostname);
- OPENSSL_free(ss->ext.tick);
- #ifndef OPENSSL_NO_PSK
- OPENSSL_free(ss->psk_identity_hint);
- OPENSSL_free(ss->psk_identity);
- #endif
- #ifndef OPENSSL_NO_SRP
- OPENSSL_free(ss->srp_username);
- #endif
- OPENSSL_free(ss->ext.alpn_selected);
- OPENSSL_free(ss->ticket_appdata);
- CRYPTO_FREE_REF(&ss->references);
- OPENSSL_clear_free(ss, sizeof(*ss));
- }
- int SSL_SESSION_up_ref(SSL_SESSION *ss)
- {
- int i;
- if (CRYPTO_UP_REF(&ss->references, &i) <= 0)
- return 0;
- REF_PRINT_COUNT("SSL_SESSION", ss);
- REF_ASSERT_ISNT(i < 2);
- return ((i > 1) ? 1 : 0);
- }
- int SSL_set_session(SSL *s, SSL_SESSION *session)
- {
- SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
- if (sc == NULL)
- return 0;
- ssl_clear_bad_session(sc);
- if (s->defltmeth != s->method) {
- if (!SSL_set_ssl_method(s, s->defltmeth))
- return 0;
- }
- if (session != NULL) {
- SSL_SESSION_up_ref(session);
- sc->verify_result = session->verify_result;
- }
- SSL_SESSION_free(sc->session);
- sc->session = session;
- return 1;
- }
- int SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
- unsigned int sid_len)
- {
- if (sid_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
- ERR_raise(ERR_LIB_SSL, SSL_R_SSL_SESSION_ID_TOO_LONG);
- return 0;
- }
- s->session_id_length = sid_len;
- if (sid != s->session_id)
- memcpy(s->session_id, sid, sid_len);
- return 1;
- }
- long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
- {
- OSSL_TIME new_timeout = ossl_seconds2time(t);
- if (s == NULL || t < 0)
- return 0;
- if (s->owner != NULL) {
- if (!CRYPTO_THREAD_write_lock(s->owner->lock))
- return 0;
- s->timeout = new_timeout;
- ssl_session_calculate_timeout(s);
- SSL_SESSION_list_add(s->owner, s);
- CRYPTO_THREAD_unlock(s->owner->lock);
- } else {
- s->timeout = new_timeout;
- ssl_session_calculate_timeout(s);
- }
- return 1;
- }
- long SSL_SESSION_get_timeout(const SSL_SESSION *s)
- {
- if (s == NULL)
- return 0;
- return (long)ossl_time_to_time_t(s->timeout);
- }
- long SSL_SESSION_get_time(const SSL_SESSION *s)
- {
- if (s == NULL)
- return 0;
- return (long)ossl_time_to_time_t(s->time);
- }
- long SSL_SESSION_set_time(SSL_SESSION *s, long t)
- {
- OSSL_TIME new_time = ossl_time_from_time_t((time_t)t);
- if (s == NULL)
- return 0;
- if (s->owner != NULL) {
- if (!CRYPTO_THREAD_write_lock(s->owner->lock))
- return 0;
- s->time = new_time;
- ssl_session_calculate_timeout(s);
- SSL_SESSION_list_add(s->owner, s);
- CRYPTO_THREAD_unlock(s->owner->lock);
- } else {
- s->time = new_time;
- ssl_session_calculate_timeout(s);
- }
- return t;
- }
- int SSL_SESSION_get_protocol_version(const SSL_SESSION *s)
- {
- return s->ssl_version;
- }
- int SSL_SESSION_set_protocol_version(SSL_SESSION *s, int version)
- {
- s->ssl_version = version;
- return 1;
- }
- const SSL_CIPHER *SSL_SESSION_get0_cipher(const SSL_SESSION *s)
- {
- return s->cipher;
- }
- int SSL_SESSION_set_cipher(SSL_SESSION *s, const SSL_CIPHER *cipher)
- {
- s->cipher = cipher;
- return 1;
- }
- const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s)
- {
- return s->ext.hostname;
- }
- int SSL_SESSION_set1_hostname(SSL_SESSION *s, const char *hostname)
- {
- OPENSSL_free(s->ext.hostname);
- if (hostname == NULL) {
- s->ext.hostname = NULL;
- return 1;
- }
- s->ext.hostname = OPENSSL_strdup(hostname);
- return s->ext.hostname != NULL;
- }
- int SSL_SESSION_has_ticket(const SSL_SESSION *s)
- {
- return (s->ext.ticklen > 0) ? 1 : 0;
- }
- unsigned long SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s)
- {
- return s->ext.tick_lifetime_hint;
- }
- void SSL_SESSION_get0_ticket(const SSL_SESSION *s, const unsigned char **tick,
- size_t *len)
- {
- *len = s->ext.ticklen;
- if (tick != NULL)
- *tick = s->ext.tick;
- }
- uint32_t SSL_SESSION_get_max_early_data(const SSL_SESSION *s)
- {
- return s->ext.max_early_data;
- }
- int SSL_SESSION_set_max_early_data(SSL_SESSION *s, uint32_t max_early_data)
- {
- s->ext.max_early_data = max_early_data;
- return 1;
- }
- void SSL_SESSION_get0_alpn_selected(const SSL_SESSION *s,
- const unsigned char **alpn,
- size_t *len)
- {
- *alpn = s->ext.alpn_selected;
- *len = s->ext.alpn_selected_len;
- }
- int SSL_SESSION_set1_alpn_selected(SSL_SESSION *s, const unsigned char *alpn,
- size_t len)
- {
- OPENSSL_free(s->ext.alpn_selected);
- if (alpn == NULL || len == 0) {
- s->ext.alpn_selected = NULL;
- s->ext.alpn_selected_len = 0;
- return 1;
- }
- s->ext.alpn_selected = OPENSSL_memdup(alpn, len);
- if (s->ext.alpn_selected == NULL) {
- s->ext.alpn_selected_len = 0;
- return 0;
- }
- s->ext.alpn_selected_len = len;
- return 1;
- }
- X509 *SSL_SESSION_get0_peer(SSL_SESSION *s)
- {
- return s->peer;
- }
- EVP_PKEY *SSL_SESSION_get0_peer_rpk(SSL_SESSION *s)
- {
- return s->peer_rpk;
- }
- int SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx,
- unsigned int sid_ctx_len)
- {
- if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
- ERR_raise(ERR_LIB_SSL, SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
- return 0;
- }
- s->sid_ctx_length = sid_ctx_len;
- if (sid_ctx != s->sid_ctx)
- memcpy(s->sid_ctx, sid_ctx, sid_ctx_len);
- return 1;
- }
- int SSL_SESSION_is_resumable(const SSL_SESSION *s)
- {
- /*
- * In the case of EAP-FAST, we can have a pre-shared "ticket" without a
- * session ID.
- */
- return !s->not_resumable
- && (s->session_id_length > 0 || s->ext.ticklen > 0);
- }
- long SSL_CTX_set_timeout(SSL_CTX *s, long t)
- {
- long l;
- if (s == NULL)
- return 0;
- l = (long)ossl_time2seconds(s->session_timeout);
- s->session_timeout = ossl_seconds2time(t);
- return l;
- }
- long SSL_CTX_get_timeout(const SSL_CTX *s)
- {
- if (s == NULL)
- return 0;
- return (long)ossl_time2seconds(s->session_timeout);
- }
- int SSL_set_session_secret_cb(SSL *s,
- tls_session_secret_cb_fn tls_session_secret_cb,
- void *arg)
- {
- SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
- if (sc == NULL)
- return 0;
- sc->ext.session_secret_cb = tls_session_secret_cb;
- sc->ext.session_secret_cb_arg = arg;
- return 1;
- }
- int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
- void *arg)
- {
- SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
- if (sc == NULL)
- return 0;
- sc->ext.session_ticket_cb = cb;
- sc->ext.session_ticket_cb_arg = arg;
- return 1;
- }
- int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len)
- {
- SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);
- if (sc == NULL)
- return 0;
- if (sc->version >= TLS1_VERSION) {
- OPENSSL_free(sc->ext.session_ticket);
- sc->ext.session_ticket = NULL;
- sc->ext.session_ticket =
- OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len);
- if (sc->ext.session_ticket == NULL)
- return 0;
- if (ext_data != NULL) {
- sc->ext.session_ticket->length = ext_len;
- sc->ext.session_ticket->data = sc->ext.session_ticket + 1;
- memcpy(sc->ext.session_ticket->data, ext_data, ext_len);
- } else {
- sc->ext.session_ticket->length = 0;
- sc->ext.session_ticket->data = NULL;
- }
- return 1;
- }
- return 0;
- }
- void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
- {
- STACK_OF(SSL_SESSION) *sk;
- SSL_SESSION *current;
- unsigned long i;
- const OSSL_TIME timeout = ossl_time_from_time_t(t);
- if (!CRYPTO_THREAD_write_lock(s->lock))
- return;
- sk = sk_SSL_SESSION_new_null();
- i = lh_SSL_SESSION_get_down_load(s->sessions);
- lh_SSL_SESSION_set_down_load(s->sessions, 0);
- /*
- * Iterate over the list from the back (oldest), and stop
- * when a session can no longer be removed.
- * Add the session to a temporary list to be freed outside
- * the SSL_CTX lock.
- * But still do the remove_session_cb() within the lock.
- */
- while (s->session_cache_tail != NULL) {
- current = s->session_cache_tail;
- if (t == 0 || sess_timedout(timeout, current)) {
- lh_SSL_SESSION_delete(s->sessions, current);
- SSL_SESSION_list_remove(s, current);
- current->not_resumable = 1;
- if (s->remove_session_cb != NULL)
- s->remove_session_cb(s, current);
- /*
- * Throw the session on a stack, it's entirely plausible
- * that while freeing outside the critical section, the
- * session could be re-added, so avoid using the next/prev
- * pointers. If the stack failed to create, or the session
- * couldn't be put on the stack, just free it here
- */
- if (sk == NULL || !sk_SSL_SESSION_push(sk, current))
- SSL_SESSION_free(current);
- } else {
- break;
- }
- }
- lh_SSL_SESSION_set_down_load(s->sessions, i);
- CRYPTO_THREAD_unlock(s->lock);
- sk_SSL_SESSION_pop_free(sk, SSL_SESSION_free);
- }
- int ssl_clear_bad_session(SSL_CONNECTION *s)
- {
- if ((s->session != NULL) &&
- !(s->shutdown & SSL_SENT_SHUTDOWN) &&
- !(SSL_in_init(SSL_CONNECTION_GET_SSL(s))
- || SSL_in_before(SSL_CONNECTION_GET_SSL(s)))) {
- SSL_CTX_remove_session(s->session_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;
- s->owner = NULL;
- }
- static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
- {
- SSL_SESSION *next;
- 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 {
- if (timeoutcmp(s, ctx->session_cache_head) >= 0) {
- /*
- * if we timeout after (or the same time as) the first
- * session, put us first - usual case
- */
- s->next = ctx->session_cache_head;
- s->next->prev = s;
- s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
- ctx->session_cache_head = s;
- } else if (timeoutcmp(s, ctx->session_cache_tail) < 0) {
- /* if we timeout before the last session, put us last */
- s->prev = ctx->session_cache_tail;
- s->prev->next = s;
- s->next = (SSL_SESSION *)&(ctx->session_cache_tail);
- ctx->session_cache_tail = s;
- } else {
- /*
- * we timeout somewhere in-between - if there is only
- * one session in the cache it will be caught above
- */
- next = ctx->session_cache_head->next;
- while (next != (SSL_SESSION*)&(ctx->session_cache_tail)) {
- if (timeoutcmp(s, next) >= 0) {
- s->next = next;
- s->prev = next->prev;
- next->prev->next = s;
- next->prev = s;
- break;
- }
- next = next->next;
- }
- }
- }
- s->owner = ctx;
- }
- void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
- int (*cb) (struct ssl_st *ssl, SSL_SESSION *sess))
- {
- ctx->new_session_cb = cb;
- }
- int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx)) (SSL *ssl, SSL_SESSION *sess) {
- return ctx->new_session_cb;
- }
- void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
- void (*cb) (SSL_CTX *ctx, SSL_SESSION *sess))
- {
- ctx->remove_session_cb = cb;
- }
- void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx)) (SSL_CTX *ctx,
- SSL_SESSION *sess) {
- return ctx->remove_session_cb;
- }
- void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
- SSL_SESSION *(*cb) (SSL *ssl,
- const unsigned char *data,
- int len, int *copy))
- {
- ctx->get_session_cb = cb;
- }
- SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx)) (SSL *ssl,
- const unsigned char
- *data, int len,
- int *copy) {
- return ctx->get_session_cb;
- }
- void SSL_CTX_set_info_callback(SSL_CTX *ctx,
- void (*cb) (const SSL *ssl, int type, int val))
- {
- ctx->info_callback = cb;
- }
- void (*SSL_CTX_get_info_callback(SSL_CTX *ctx)) (const SSL *ssl, int type,
- int val) {
- return ctx->info_callback;
- }
- void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
- int (*cb) (SSL *ssl, X509 **x509,
- EVP_PKEY **pkey))
- {
- ctx->client_cert_cb = cb;
- }
- int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx)) (SSL *ssl, X509 **x509,
- EVP_PKEY **pkey) {
- return ctx->client_cert_cb;
- }
- 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;
- }
- void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
- int (*cb) (SSL *ssl,
- const unsigned char *cookie,
- unsigned int cookie_len))
- {
- ctx->app_verify_cookie_cb = cb;
- }
- int SSL_SESSION_set1_ticket_appdata(SSL_SESSION *ss, const void *data, size_t len)
- {
- OPENSSL_free(ss->ticket_appdata);
- ss->ticket_appdata_len = 0;
- if (data == NULL || len == 0) {
- ss->ticket_appdata = NULL;
- return 1;
- }
- ss->ticket_appdata = OPENSSL_memdup(data, len);
- if (ss->ticket_appdata != NULL) {
- ss->ticket_appdata_len = len;
- return 1;
- }
- return 0;
- }
- int SSL_SESSION_get0_ticket_appdata(SSL_SESSION *ss, void **data, size_t *len)
- {
- *data = ss->ticket_appdata;
- *len = ss->ticket_appdata_len;
- return 1;
- }
- void SSL_CTX_set_stateless_cookie_generate_cb(
- SSL_CTX *ctx,
- int (*cb) (SSL *ssl,
- unsigned char *cookie,
- size_t *cookie_len))
- {
- ctx->gen_stateless_cookie_cb = cb;
- }
- void SSL_CTX_set_stateless_cookie_verify_cb(
- SSL_CTX *ctx,
- int (*cb) (SSL *ssl,
- const unsigned char *cookie,
- size_t cookie_len))
- {
- ctx->verify_stateless_cookie_cb = cb;
- }
- IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION)
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