diff options
Diffstat (limited to 'thirdparty/openssl/ssl/ssl_sess.c')
| -rw-r--r-- | thirdparty/openssl/ssl/ssl_sess.c | 1273 |
1 files changed, 1273 insertions, 0 deletions
diff --git a/thirdparty/openssl/ssl/ssl_sess.c b/thirdparty/openssl/ssl/ssl_sess.c new file mode 100644 index 0000000000..b182998343 --- /dev/null +++ b/thirdparty/openssl/ssl/ssl_sess.c @@ -0,0 +1,1273 @@ +/* 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.] + */ +/* ==================================================================== + * 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 <stdio.h> +#include <openssl/lhash.h> +#include <openssl/rand.h> +#ifndef OPENSSL_NO_ENGINE +# include <openssl/engine.h> +#endif +#include "ssl_locl.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); + +SSL_SESSION *SSL_get_session(const SSL *ssl) +/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */ +{ + return (ssl->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. + */ + CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION); + sess = ssl->session; + if (sess) + sess->references++; + CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION); + return (sess); +} + +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); +} + +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; + + ss = (SSL_SESSION *)OPENSSL_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->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */ + ss->references = 1; + ss->timeout = 60 * 5 + 4; /* 5 minute timeout by default */ + ss->time = (unsigned long)time(NULL); + ss->prev = NULL; + ss->next = NULL; + ss->compress_meth = 0; +#ifndef OPENSSL_NO_TLSEXT + ss->tlsext_hostname = NULL; +# ifndef OPENSSL_NO_EC + ss->tlsext_ecpointformatlist_length = 0; + ss->tlsext_ecpointformatlist = NULL; + ss->tlsext_ellipticcurvelist_length = 0; + ss->tlsext_ellipticcurvelist = NULL; +# endif +#endif + CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); +#ifndef OPENSSL_NO_PSK + ss->psk_identity_hint = NULL; + ss->psk_identity = NULL; +#endif +#ifndef OPENSSL_NO_SRP + ss->srp_username = NULL; +#endif + return (ss); +} + +/* + * 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(SSL_SESSION *src, int ticket) +{ + SSL_SESSION *dest; + + dest = OPENSSL_malloc(sizeof(*src)); + if (dest == NULL) { + goto err; + } + 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->ciphers = NULL; +#ifndef OPENSSL_NO_TLSEXT + dest->tlsext_hostname = NULL; +# ifndef OPENSSL_NO_EC + dest->tlsext_ecpointformatlist = NULL; + dest->tlsext_ellipticcurvelist = NULL; +# endif + dest->tlsext_tick = NULL; +#endif +#ifndef OPENSSL_NO_SRP + dest->srp_username = NULL; +#endif + memset(&dest->ex_data, 0, sizeof(dest->ex_data)); + + /* We deliberately don't copy the prev and next pointers */ + dest->prev = NULL; + dest->next = NULL; + + dest->references = 1; + + if (src->sess_cert != NULL) + CRYPTO_add(&src->sess_cert->references, 1, CRYPTO_LOCK_SSL_SESS_CERT); + + if (src->peer != NULL) + CRYPTO_add(&src->peer->references, 1, CRYPTO_LOCK_X509); + +#ifndef OPENSSL_NO_PSK + if (src->psk_identity_hint) { + dest->psk_identity_hint = BUF_strdup(src->psk_identity_hint); + if (dest->psk_identity_hint == NULL) { + goto err; + } + } + if (src->psk_identity) { + dest->psk_identity = BUF_strdup(src->psk_identity); + if (dest->psk_identity == NULL) { + goto err; + } + } +#endif + + if(src->ciphers != NULL) { + dest->ciphers = sk_SSL_CIPHER_dup(src->ciphers); + if (dest->ciphers == NULL) + goto err; + } + + if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, + &dest->ex_data, &src->ex_data)) { + goto err; + } + +#ifndef OPENSSL_NO_TLSEXT + if (src->tlsext_hostname) { + dest->tlsext_hostname = BUF_strdup(src->tlsext_hostname); + if (dest->tlsext_hostname == NULL) { + goto err; + } + } +# ifndef OPENSSL_NO_EC + if (src->tlsext_ecpointformatlist) { + dest->tlsext_ecpointformatlist = + BUF_memdup(src->tlsext_ecpointformatlist, + src->tlsext_ecpointformatlist_length); + if (dest->tlsext_ecpointformatlist == NULL) + goto err; + } + if (src->tlsext_ellipticcurvelist) { + dest->tlsext_ellipticcurvelist = + BUF_memdup(src->tlsext_ellipticcurvelist, + src->tlsext_ellipticcurvelist_length); + if (dest->tlsext_ellipticcurvelist == NULL) + goto err; + } +# endif + + if (ticket != 0) { + dest->tlsext_tick = BUF_memdup(src->tlsext_tick, src->tlsext_ticklen); + if(dest->tlsext_tick == NULL) + goto err; + } else { + dest->tlsext_tick_lifetime_hint = 0; + dest->tlsext_ticklen = 0; + } +#endif + +#ifndef OPENSSL_NO_SRP + if (src->srp_username) { + dest->srp_username = BUF_strdup(src->srp_username); + if (dest->srp_username == NULL) { + goto err; + } + } +#endif + + return dest; +err: + SSLerr(SSL_F_SSL_SESSION_DUP, ERR_R_MALLOC_FAILURE); + SSL_SESSION_free(dest); + return NULL; +} + +const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, + unsigned int *len) +{ + if (len) + *len = s->session_id_length; + return s->session_id; +} + +unsigned int SSL_SESSION_get_compress_id(const SSL_SESSION *s) +{ + return s->compress_meth; +} + +/* + * Even with SSLv2, we have 16 bytes (128 bits) of session ID space. + * SSLv3/TLSv1 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 +static int def_generate_session_id(const SSL *ssl, unsigned char *id, + unsigned int *id_len) +{ + unsigned int retry = 0; + do + if (RAND_pseudo_bytes(id, *id_len) <= 0) + return 0; + 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) +{ + /* This gets used by clients and servers. */ + + unsigned int tmp; + SSL_SESSION *ss = NULL; + GEN_SESSION_CB cb = def_generate_session_id; + + 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) { + if (s->version == SSL2_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 if (s->version == TLS1_1_VERSION) { + ss->ssl_version = TLS1_1_VERSION; + ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH; + } else if (s->version == TLS1_2_VERSION) { + ss->ssl_version = TLS1_2_VERSION; + ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH; + } else if (s->version == DTLS1_BAD_VER) { + ss->ssl_version = DTLS1_BAD_VER; + ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH; + } else if (s->version == DTLS1_VERSION) { + ss->ssl_version = DTLS1_VERSION; + ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH; + } else if (s->version == DTLS1_2_VERSION) { + ss->ssl_version = DTLS1_2_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); + } +#ifndef OPENSSL_NO_TLSEXT + /*- + * 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, s3_srvr.c calls + * ssl_get_new_session() in ssl3_get_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) s3_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->tlsext_ticket_expected) { + ss->session_id_length = 0; + goto sess_id_done; + } +#endif + /* 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 */ + SSLerr(SSL_F_SSL_GET_NEW_SESSION, + 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 || (tmp > ss->session_id_length)) { + /* The callback set an illegal length */ + SSLerr(SSL_F_SSL_GET_NEW_SESSION, + SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); + SSL_SESSION_free(ss); + return (0); + } + /* If the session length was shrunk and we're SSLv2, pad it */ + if ((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) + memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); + else + ss->session_id_length = tmp; + /* Finally, check for a conflict */ + if (SSL_has_matching_session_id(s, ss->session_id, + ss->session_id_length)) { + SSLerr(SSL_F_SSL_GET_NEW_SESSION, SSL_R_SSL_SESSION_ID_CONFLICT); + SSL_SESSION_free(ss); + return (0); + } +#ifndef OPENSSL_NO_TLSEXT + sess_id_done: + if (s->tlsext_hostname) { + ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); + if (ss->tlsext_hostname == NULL) { + SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); + SSL_SESSION_free(ss); + return 0; + } + } +#endif + } else { + ss->session_id_length = 0; + } + + if (s->sid_ctx_length > sizeof ss->sid_ctx) { + SSLerr(SSL_F_SSL_GET_NEW_SESSION, 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); +} + +/*- + * ssl_get_prev 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. + * len: the length of the session ID. + * limit: a pointer to the first byte after the ClientHello. + * + * 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. + * - Both for new and resumed sessions, s->tlsext_ticket_expected is set to 1 + * if the server should issue a new session ticket (to 0 otherwise). + */ +int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len, + const unsigned char *limit) +{ + /* This is used only by servers. */ + + SSL_SESSION *ret = NULL; + int fatal = 0; + int try_session_cache = 1; +#ifndef OPENSSL_NO_TLSEXT + int r; +#endif + + if (session_id + len > limit) { + fatal = 1; + goto err; + } + + if (len == 0) + try_session_cache = 0; + +#ifndef OPENSSL_NO_TLSEXT + /* sets s->tlsext_ticket_expected */ + r = tls1_process_ticket(s, session_id, len, limit, &ret); + switch (r) { + case -1: /* Error during processing */ + fatal = 1; + goto err; + case 0: /* No ticket found */ + case 1: /* Zero length ticket found */ + break; /* Ok to carry on processing session id. */ + case 2: /* Ticket found but not decrypted. */ + case 3: /* Ticket decrypted, *ret has been set. */ + try_session_cache = 0; + break; + default: + abort(); + } +#endif + + if (try_session_cache && + ret == NULL && + !(s->session_ctx->session_cache_mode & + SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) { + SSL_SESSION data; + data.ssl_version = s->version; + data.session_id_length = len; + if (len == 0) + return 0; + memcpy(data.session_id, session_id, len); + CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); + ret = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data); + if (ret != NULL) { + /* don't allow other threads to steal it: */ + CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION); + } + CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); + if (ret == NULL) + s->session_ctx->stats.sess_miss++; + } + + if (try_session_cache && + ret == NULL && s->session_ctx->get_session_cb != NULL) { + int copy = 1; + + if ((ret = s->session_ctx->get_session_cb(s, session_id, len, ©))) { + 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) + CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION); + + /* + * 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)) + /* + * The following should not return 1, otherwise, things are + * very strange + */ + SSL_CTX_add_session(s->session_ctx, ret); + } + } + + if (ret == NULL) + goto err; + + /* Now ret is non-NULL and we own one of its reference counts. */ + + 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). + */ + + SSLerr(SSL_F_SSL_GET_PREV_SESSION, + SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); + fatal = 1; + goto err; + } + + if (ret->cipher == NULL) { + unsigned 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) + goto err; + } + + if (ret->timeout < (long)(time(NULL) - ret->time)) { /* timeout */ + 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; + } + + s->session_ctx->stats.sess_hit++; + + if (s->session != NULL) + SSL_SESSION_free(s->session); + s->session = ret; + s->verify_result = s->session->verify_result; + return 1; + + err: + if (ret != NULL) { + SSL_SESSION_free(ret); +#ifndef OPENSSL_NO_TLSEXT + if (!try_session_cache) { + /* + * The session was from a ticket, so we should issue a ticket for + * the new session + */ + s->tlsext_ticket_expected = 1; + } +#endif + } + if (fatal) + return -1; + else + 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); +} + +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) + 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); + } + } else + ret = 0; + 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); +#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(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); + + OPENSSL_cleanse(ss->key_arg, sizeof ss->key_arg); + OPENSSL_cleanse(ss->master_key, sizeof ss->master_key); + OPENSSL_cleanse(ss->session_id, sizeof ss->session_id); + if (ss->sess_cert != NULL) + ssl_sess_cert_free(ss->sess_cert); + if (ss->peer != NULL) + X509_free(ss->peer); + if (ss->ciphers != NULL) + sk_SSL_CIPHER_free(ss->ciphers); +#ifndef OPENSSL_NO_TLSEXT + if (ss->tlsext_hostname != NULL) + OPENSSL_free(ss->tlsext_hostname); + if (ss->tlsext_tick != NULL) + OPENSSL_free(ss->tlsext_tick); +# ifndef OPENSSL_NO_EC + ss->tlsext_ecpointformatlist_length = 0; + if (ss->tlsext_ecpointformatlist != NULL) + OPENSSL_free(ss->tlsext_ecpointformatlist); + ss->tlsext_ellipticcurvelist_length = 0; + if (ss->tlsext_ellipticcurvelist != NULL) + OPENSSL_free(ss->tlsext_ellipticcurvelist); +# endif /* OPENSSL_NO_EC */ +#endif +#ifndef OPENSSL_NO_PSK + if (ss->psk_identity_hint != NULL) + OPENSSL_free(ss->psk_identity_hint); + if (ss->psk_identity != NULL) + OPENSSL_free(ss->psk_identity); +#endif +#ifndef OPENSSL_NO_SRP + if (ss->srp_username != NULL) + OPENSSL_free(ss->srp_username); +#endif + OPENSSL_cleanse(ss, sizeof(*ss)); + OPENSSL_free(ss); +} + +int SSL_set_session(SSL *s, SSL_SESSION *session) +{ + int ret = 0; + const 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); + } +#ifndef OPENSSL_NO_KRB5 + if (s->kssl_ctx && !s->kssl_ctx->client_princ && + session->krb5_client_princ_len > 0) { + s->kssl_ctx->client_princ = + (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1); + memcpy(s->kssl_ctx->client_princ, session->krb5_client_princ, + session->krb5_client_princ_len); + s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0'; + } +#endif /* OPENSSL_NO_KRB5 */ + + /* 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; + s->verify_result = s->session->verify_result; + /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL); */ + ret = 1; + } else { + if (s->session != NULL) { + SSL_SESSION_free(s->session); + s->session = NULL; + } + + meth = s->ctx->method; + if (meth != s->method) { + 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(const SSL_SESSION *s) +{ + if (s == NULL) + return (0); + return (s->timeout); +} + +long SSL_SESSION_get_time(const 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); +} + +X509 *SSL_SESSION_get0_peer(SSL_SESSION *s) +{ + return s->peer; +} + +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) { + SSLerr(SSL_F_SSL_SESSION_SET1_ID_CONTEXT, + SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG); + return 0; + } + s->sid_ctx_length = sid_ctx_len; + memcpy(s->sid_ctx, sid_ctx, sid_ctx_len); + + return 1; +} + +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(const SSL_CTX *s) +{ + if (s == NULL) + return (0); + return (s->session_timeout); +} + +#ifndef OPENSSL_NO_TLSEXT +int SSL_set_session_secret_cb(SSL *s, + int (*tls_session_secret_cb) (SSL *s, + void *secret, + int *secret_len, + STACK_OF(SSL_CIPHER) + *peer_ciphers, + SSL_CIPHER + **cipher, + void *arg), + void *arg) +{ + if (s == NULL) + return (0); + s->tls_session_secret_cb = tls_session_secret_cb; + s->tls_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) +{ + if (s == NULL) + return (0); + s->tls_session_ticket_ext_cb = cb; + s->tls_session_ticket_ext_cb_arg = arg; + return (1); +} + +int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len) +{ + if (s->version >= TLS1_VERSION) { + if (s->tlsext_session_ticket) { + OPENSSL_free(s->tlsext_session_ticket); + s->tlsext_session_ticket = NULL; + } + + s->tlsext_session_ticket = + OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len); + if (!s->tlsext_session_ticket) { + SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE); + return 0; + } + + if (ext_data) { + s->tlsext_session_ticket->length = ext_len; + s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1; + memcpy(s->tlsext_session_ticket->data, ext_data, ext_len); + } else { + s->tlsext_session_ticket->length = 0; + s->tlsext_session_ticket->data = NULL; + } + + return 1; + } + + return 0; +} +#endif /* OPENSSL_NO_TLSEXT */ + +typedef struct timeout_param_st { + SSL_CTX *ctx; + long time; + LHASH_OF(SSL_SESSION) *cache; +} TIMEOUT_PARAM; + +static void timeout_doall_arg(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 + */ + (void)lh_SSL_SESSION_delete(p->cache, 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); + } +} + +static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM) + +void SSL_CTX_flush_sessions(SSL_CTX *s, long t) +{ + unsigned long i; + TIMEOUT_PARAM tp; + + tp.ctx = s; + tp.cache = s->sessions; + if (tp.cache == NULL) + return; + tp.time = t; + CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); + i = CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load; + CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = 0; + lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), + TIMEOUT_PARAM, &tp); + CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = i; + CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); +} + +int ssl_clear_bad_session(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(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(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; + } +} + +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) (struct ssl_st *ssl, + 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, + 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; +} + +#ifndef OPENSSL_NO_ENGINE +int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e) +{ + if (!ENGINE_init(e)) { + SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB); + return 0; + } + if (!ENGINE_get_ssl_client_cert_function(e)) { + SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, + SSL_R_NO_CLIENT_CERT_METHOD); + ENGINE_finish(e); + return 0; + } + ctx->client_cert_engine = e; + return 1; +} +#endif + +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, unsigned char *cookie, + unsigned int cookie_len)) +{ + ctx->app_verify_cookie_cb = cb; +} + +IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, + SSL_SESSION) |