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ssl_srvr.c
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/* $OpenBSD: ssl_srvr.c,v 1.165 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) 1998-2007 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 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
*
* Portions of the attached software ("Contribution") are developed by
* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
*
* The Contribution is licensed pursuant to the OpenSSL open source
* license provided above.
*
* ECC cipher suite support in OpenSSL originally written by
* Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
*
*/
/* ====================================================================
* 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 <limits.h>
#include <stdio.h>
#include <openssl/bn.h>
#include <openssl/buffer.h>
#include <openssl/curve25519.h>
#include <openssl/evp.h>
#include <openssl/dh.h>
#include <openssl/hmac.h>
#include <openssl/md5.h>
#include <openssl/objects.h>
#include <openssl/opensslconf.h>
#include <openssl/x509.h>
#include "bytestring.h"
#include "crypto_internal.h"
#include "dtls_local.h"
#include "ssl_local.h"
#include "ssl_sigalgs.h"
#include "ssl_tlsext.h"
static int ssl3_get_client_hello(SSL *s);
static int ssl3_send_dtls_hello_verify_request(SSL *s);
static int ssl3_send_server_hello(SSL *s);
static int ssl3_send_hello_request(SSL *s);
static int ssl3_send_server_certificate(SSL *s);
static int ssl3_send_server_key_exchange(SSL *s);
static int ssl3_send_certificate_request(SSL *s);
static int ssl3_send_server_done(SSL *s);
static int ssl3_get_client_certificate(SSL *s);
static int ssl3_get_client_key_exchange(SSL *s);
static int ssl3_get_cert_verify(SSL *s);
static int ssl3_send_newsession_ticket(SSL *s);
static int ssl3_send_cert_status(SSL *s);
static int ssl3_send_server_change_cipher_spec(SSL *s);
static int ssl3_send_server_finished(SSL *s);
static int ssl3_get_client_finished(SSL *s);
int
ssl3_accept(SSL *s)
{
unsigned long alg_k;
int new_state, state, skip = 0;
int listen = 0;
int ret = -1;
ERR_clear_error();
errno = 0;
if (SSL_is_dtls(s))
listen = s->d1->listen;
/* init things to blank */
s->in_handshake++;
if (!SSL_in_init(s) || SSL_in_before(s))
SSL_clear(s);
if (SSL_is_dtls(s))
s->d1->listen = listen;
for (;;) {
state = s->s3->hs.state;
switch (s->s3->hs.state) {
case SSL_ST_RENEGOTIATE:
s->renegotiate = 1;
/* s->s3->hs.state=SSL_ST_ACCEPT; */
case SSL_ST_BEFORE:
case SSL_ST_ACCEPT:
case SSL_ST_BEFORE|SSL_ST_ACCEPT:
case SSL_ST_OK|SSL_ST_ACCEPT:
s->server = 1;
ssl_info_callback(s, SSL_CB_HANDSHAKE_START, 1);
if (!ssl_legacy_stack_version(s, s->version)) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
ret = -1;
goto end;
}
if (!ssl_supported_tls_version_range(s,
&s->s3->hs.our_min_tls_version,
&s->s3->hs.our_max_tls_version)) {
SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE);
ret = -1;
goto end;
}
if (!ssl_security_version(s,
s->s3->hs.our_min_tls_version)) {
SSLerror(s, SSL_R_VERSION_TOO_LOW);
ret = -1;
goto end;
}
if (!ssl3_setup_init_buffer(s)) {
ret = -1;
goto end;
}
if (!ssl3_setup_buffers(s)) {
ret = -1;
goto end;
}
s->init_num = 0;
if (s->s3->hs.state != SSL_ST_RENEGOTIATE) {
/*
* Ok, we now need to push on a buffering BIO
* so that the output is sent in a way that
* TCP likes :-)
*/
if (!ssl_init_wbio_buffer(s, 1)) {
ret = -1;
goto end;
}
if (!tls1_transcript_init(s)) {
ret = -1;
goto end;
}
s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_A;
s->ctx->stats.sess_accept++;
} else if (!SSL_is_dtls(s) && !s->s3->send_connection_binding) {
/*
* Server attempting to renegotiate with
* client that doesn't support secure
* renegotiation.
*/
SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
ssl3_send_alert(s, SSL3_AL_FATAL,
SSL_AD_HANDSHAKE_FAILURE);
ret = -1;
goto end;
} else {
/*
* s->s3->hs.state == SSL_ST_RENEGOTIATE,
* we will just send a HelloRequest.
*/
s->ctx->stats.sess_accept_renegotiate++;
s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_A;
}
break;
case SSL3_ST_SW_HELLO_REQ_A:
case SSL3_ST_SW_HELLO_REQ_B:
s->shutdown = 0;
if (SSL_is_dtls(s)) {
dtls1_clear_record_buffer(s);
dtls1_start_timer(s);
}
ret = ssl3_send_hello_request(s);
if (ret <= 0)
goto end;
if (SSL_is_dtls(s))
s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A;
else
s->s3->hs.tls12.next_state = SSL3_ST_SW_HELLO_REQ_C;
s->s3->hs.state = SSL3_ST_SW_FLUSH;
s->init_num = 0;
if (SSL_is_dtls(s)) {
if (!tls1_transcript_init(s)) {
ret = -1;
goto end;
}
}
break;
case SSL3_ST_SW_HELLO_REQ_C:
s->s3->hs.state = SSL_ST_OK;
break;
case SSL3_ST_SR_CLNT_HELLO_A:
case SSL3_ST_SR_CLNT_HELLO_B:
case SSL3_ST_SR_CLNT_HELLO_C:
s->shutdown = 0;
if (SSL_is_dtls(s)) {
ret = ssl3_get_client_hello(s);
if (ret <= 0)
goto end;
dtls1_stop_timer(s);
if (ret == 1 &&
(SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
else
s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
s->init_num = 0;
/*
* Reflect ClientHello sequence to remain
* stateless while listening.
*/
if (listen) {
tls12_record_layer_reflect_seq_num(
s->rl);
}
/* If we're just listening, stop here */
if (listen && s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) {
ret = 2;
s->d1->listen = 0;
/*
* Set expected sequence numbers to
* continue the handshake.
*/
s->d1->handshake_read_seq = 2;
s->d1->handshake_write_seq = 1;
s->d1->next_handshake_write_seq = 1;
goto end;
}
} else {
if (s->rwstate != SSL_X509_LOOKUP) {
ret = ssl3_get_client_hello(s);
if (ret <= 0)
goto end;
}
s->renegotiate = 2;
s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A;
s->init_num = 0;
}
break;
case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
ret = ssl3_send_dtls_hello_verify_request(s);
if (ret <= 0)
goto end;
s->s3->hs.state = SSL3_ST_SW_FLUSH;
s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A;
/* HelloVerifyRequest resets Finished MAC. */
tls1_transcript_reset(s);
break;
case SSL3_ST_SW_SRVR_HELLO_A:
case SSL3_ST_SW_SRVR_HELLO_B:
if (SSL_is_dtls(s)) {
s->renegotiate = 2;
dtls1_start_timer(s);
}
ret = ssl3_send_server_hello(s);
if (ret <= 0)
goto end;
if (s->hit) {
if (s->tlsext_ticket_expected)
s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
else
s->s3->hs.state = SSL3_ST_SW_CHANGE_A;
} else {
s->s3->hs.state = SSL3_ST_SW_CERT_A;
}
s->init_num = 0;
break;
case SSL3_ST_SW_CERT_A:
case SSL3_ST_SW_CERT_B:
/* Check if it is anon DH or anon ECDH. */
if (!(s->s3->hs.cipher->algorithm_auth &
SSL_aNULL)) {
if (SSL_is_dtls(s))
dtls1_start_timer(s);
ret = ssl3_send_server_certificate(s);
if (ret <= 0)
goto end;
if (s->tlsext_status_expected)
s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_A;
else
s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A;
} else {
skip = 1;
s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A;
}
s->init_num = 0;
break;
case SSL3_ST_SW_KEY_EXCH_A:
case SSL3_ST_SW_KEY_EXCH_B:
alg_k = s->s3->hs.cipher->algorithm_mkey;
/*
* Only send if using a DH key exchange.
*
* For ECC ciphersuites, we send a ServerKeyExchange
* message only if the cipher suite is ECDHE. In other
* cases, the server certificate contains the server's
* public key for key exchange.
*/
if (alg_k & (SSL_kDHE|SSL_kECDHE)) {
if (SSL_is_dtls(s))
dtls1_start_timer(s);
ret = ssl3_send_server_key_exchange(s);
if (ret <= 0)
goto end;
} else
skip = 1;
s->s3->hs.state = SSL3_ST_SW_CERT_REQ_A;
s->init_num = 0;
break;
case SSL3_ST_SW_CERT_REQ_A:
case SSL3_ST_SW_CERT_REQ_B:
/*
* Determine whether or not we need to request a
* certificate.
*
* Do not request a certificate if:
*
* - We did not ask for it (SSL_VERIFY_PEER is unset).
*
* - SSL_VERIFY_CLIENT_ONCE is set and we are
* renegotiating.
*
* - We are using an anonymous ciphersuites
* (see section "Certificate request" in SSL 3 drafts
* and in RFC 2246) ... except when the application
* insists on verification (against the specs, but
* s3_clnt.c accepts this for SSL 3).
*/
if (!(s->verify_mode & SSL_VERIFY_PEER) ||
((s->session->peer_cert != NULL) &&
(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
((s->s3->hs.cipher->algorithm_auth &
SSL_aNULL) && !(s->verify_mode &
SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) {
/* No cert request. */
skip = 1;
s->s3->hs.tls12.cert_request = 0;
s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A;
if (!SSL_is_dtls(s))
tls1_transcript_free(s);
} else {
s->s3->hs.tls12.cert_request = 1;
if (SSL_is_dtls(s))
dtls1_start_timer(s);
ret = ssl3_send_certificate_request(s);
if (ret <= 0)
goto end;
s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A;
s->init_num = 0;
}
break;
case SSL3_ST_SW_SRVR_DONE_A:
case SSL3_ST_SW_SRVR_DONE_B:
if (SSL_is_dtls(s))
dtls1_start_timer(s);
ret = ssl3_send_server_done(s);
if (ret <= 0)
goto end;
s->s3->hs.tls12.next_state = SSL3_ST_SR_CERT_A;
s->s3->hs.state = SSL3_ST_SW_FLUSH;
s->init_num = 0;
break;
case SSL3_ST_SW_FLUSH:
/*
* This code originally checked to see if
* any data was pending using BIO_CTRL_INFO
* and then flushed. This caused problems
* as documented in PR#1939. The proposed
* fix doesn't completely resolve this issue
* as buggy implementations of BIO_CTRL_PENDING
* still exist. So instead we just flush
* unconditionally.
*/
s->rwstate = SSL_WRITING;
if (BIO_flush(s->wbio) <= 0) {
if (SSL_is_dtls(s)) {
/* If the write error was fatal, stop trying. */
if (!BIO_should_retry(s->wbio)) {
s->rwstate = SSL_NOTHING;
s->s3->hs.state = s->s3->hs.tls12.next_state;
}
}
ret = -1;
goto end;
}
s->rwstate = SSL_NOTHING;
s->s3->hs.state = s->s3->hs.tls12.next_state;
break;
case SSL3_ST_SR_CERT_A:
case SSL3_ST_SR_CERT_B:
if (s->s3->hs.tls12.cert_request != 0) {
ret = ssl3_get_client_certificate(s);
if (ret <= 0)
goto end;
}
s->init_num = 0;
s->s3->hs.state = SSL3_ST_SR_KEY_EXCH_A;
break;
case SSL3_ST_SR_KEY_EXCH_A:
case SSL3_ST_SR_KEY_EXCH_B:
ret = ssl3_get_client_key_exchange(s);
if (ret <= 0)
goto end;
if (SSL_is_dtls(s)) {
s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A;
s->init_num = 0;
}
alg_k = s->s3->hs.cipher->algorithm_mkey;
if (SSL_USE_SIGALGS(s)) {
s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A;
s->init_num = 0;
if (!s->session->peer_cert)
break;
/*
* Freeze the transcript for use during client
* certificate verification.
*/
tls1_transcript_freeze(s);
} else {
s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A;
s->init_num = 0;
tls1_transcript_free(s);
/*
* We need to get hashes here so if there is
* a client cert, it can be verified.
*/
if (!tls1_transcript_hash_value(s,
s->s3->hs.tls12.cert_verify,
sizeof(s->s3->hs.tls12.cert_verify),
NULL)) {
ret = -1;
goto end;
}
}
break;
case SSL3_ST_SR_CERT_VRFY_A:
case SSL3_ST_SR_CERT_VRFY_B:
if (SSL_is_dtls(s))
s->d1->change_cipher_spec_ok = 1;
else
s->s3->flags |= SSL3_FLAGS_CCS_OK;
/* we should decide if we expected this one */
ret = ssl3_get_cert_verify(s);
if (ret <= 0)
goto end;
s->s3->hs.state = SSL3_ST_SR_FINISHED_A;
s->init_num = 0;
break;
case SSL3_ST_SR_FINISHED_A:
case SSL3_ST_SR_FINISHED_B:
if (SSL_is_dtls(s))
s->d1->change_cipher_spec_ok = 1;
else
s->s3->flags |= SSL3_FLAGS_CCS_OK;
ret = ssl3_get_client_finished(s);
if (ret <= 0)
goto end;
if (SSL_is_dtls(s))
dtls1_stop_timer(s);
if (s->hit)
s->s3->hs.state = SSL_ST_OK;
else if (s->tlsext_ticket_expected)
s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A;
else
s->s3->hs.state = SSL3_ST_SW_CHANGE_A;
s->init_num = 0;
break;
case SSL3_ST_SW_SESSION_TICKET_A:
case SSL3_ST_SW_SESSION_TICKET_B:
ret = ssl3_send_newsession_ticket(s);
if (ret <= 0)
goto end;
s->s3->hs.state = SSL3_ST_SW_CHANGE_A;
s->init_num = 0;
break;
case SSL3_ST_SW_CERT_STATUS_A:
case SSL3_ST_SW_CERT_STATUS_B:
ret = ssl3_send_cert_status(s);
if (ret <= 0)
goto end;
s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A;
s->init_num = 0;
break;
case SSL3_ST_SW_CHANGE_A:
case SSL3_ST_SW_CHANGE_B:
ret = ssl3_send_server_change_cipher_spec(s);
if (ret <= 0)
goto end;
s->s3->hs.state = SSL3_ST_SW_FINISHED_A;
s->init_num = 0;
s->session->cipher_value = s->s3->hs.cipher->value;
if (!tls1_setup_key_block(s)) {
ret = -1;
goto end;
}
if (!tls1_change_write_cipher_state(s)) {
ret = -1;
goto end;
}
break;
case SSL3_ST_SW_FINISHED_A:
case SSL3_ST_SW_FINISHED_B:
ret = ssl3_send_server_finished(s);
if (ret <= 0)
goto end;
s->s3->hs.state = SSL3_ST_SW_FLUSH;
if (s->hit) {
s->s3->hs.tls12.next_state = SSL3_ST_SR_FINISHED_A;
tls1_transcript_free(s);
} else
s->s3->hs.tls12.next_state = SSL_ST_OK;
s->init_num = 0;
break;
case SSL_ST_OK:
/* clean a few things up */
tls1_cleanup_key_block(s);
if (s->s3->handshake_transcript != NULL) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
ret = -1;
goto end;
}
if (!SSL_is_dtls(s))
ssl3_release_init_buffer(s);
/* remove buffering on output */
ssl_free_wbio_buffer(s);
s->init_num = 0;
/* Skipped if we just sent a HelloRequest. */
if (s->renegotiate == 2) {
s->renegotiate = 0;
s->new_session = 0;
ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
s->ctx->stats.sess_accept_good++;
/* s->server=1; */
s->handshake_func = ssl3_accept;
ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1);
}
ret = 1;
if (SSL_is_dtls(s)) {
/* Done handshaking, next message is client hello. */
s->d1->handshake_read_seq = 0;
/* Next message is server hello. */
s->d1->handshake_write_seq = 0;
s->d1->next_handshake_write_seq = 0;
}
goto end;
/* break; */
default:
SSLerror(s, SSL_R_UNKNOWN_STATE);
ret = -1;
goto end;
/* break; */
}
if (!s->s3->hs.tls12.reuse_message && !skip) {
if (s->s3->hs.state != state) {
new_state = s->s3->hs.state;
s->s3->hs.state = state;
ssl_info_callback(s, SSL_CB_ACCEPT_LOOP, 1);
s->s3->hs.state = new_state;
}
}
skip = 0;
}
end:
/* BIO_flush(s->wbio); */
s->in_handshake--;
ssl_info_callback(s, SSL_CB_ACCEPT_EXIT, ret);
return (ret);
}
static int
ssl3_send_hello_request(SSL *s)
{
CBB cbb, hello;
memset(&cbb, 0, sizeof(cbb));
if (s->s3->hs.state == SSL3_ST_SW_HELLO_REQ_A) {
if (!ssl3_handshake_msg_start(s, &cbb, &hello,
SSL3_MT_HELLO_REQUEST))
goto err;
if (!ssl3_handshake_msg_finish(s, &cbb))
goto err;
s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_B;
}
/* SSL3_ST_SW_HELLO_REQ_B */
return (ssl3_handshake_write(s));
err:
CBB_cleanup(&cbb);
return (-1);
}
static int
ssl3_get_client_hello(SSL *s)
{
CBS cbs, client_random, session_id, cookie, cipher_suites;
CBS compression_methods;
uint16_t client_version;
uint8_t comp_method;
int comp_null;
int i, j, al, ret, cookie_valid = 0;
SSL_CIPHER *c;
STACK_OF(SSL_CIPHER) *ciphers = NULL;
const SSL_METHOD *method;
uint16_t shared_version;
/*
* We do this so that we will respond with our native type.
* If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
* This down switching should be handled by a different method.
* If we are SSLv3, we will respond with SSLv3, even if prompted with
* TLSv1.
*/
if (s->s3->hs.state == SSL3_ST_SR_CLNT_HELLO_A)
s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_B;
s->first_packet = 1;
if ((ret = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B,
SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO,
SSL3_RT_MAX_PLAIN_LENGTH)) <= 0)
return ret;
s->first_packet = 0;
ret = -1;
if (s->init_num < 0)
goto err;
CBS_init(&cbs, s->init_msg, s->init_num);
/* Parse client hello up until the extensions (if any). */
if (!CBS_get_u16(&cbs, &client_version))
goto decode_err;
if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE))
goto decode_err;
if (!CBS_get_u8_length_prefixed(&cbs, &session_id))
goto decode_err;
if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) {
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG);
goto fatal_err;
}
if (SSL_is_dtls(s)) {
if (!CBS_get_u8_length_prefixed(&cbs, &cookie))
goto decode_err;
}
if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites))
goto decode_err;
if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods))
goto decode_err;
/*
* Use version from inside client hello, not from record header.
* (may differ: see RFC 2246, Appendix E, second paragraph)
*/
if (!ssl_max_shared_version(s, client_version, &shared_version)) {
if ((client_version >> 8) == SSL3_VERSION_MAJOR &&
!tls12_record_layer_write_protected(s->rl)) {
/*
* Similar to ssl3_get_record, send alert using remote
* version number.
*/
s->version = client_version;
}
SSLerror(s, SSL_R_WRONG_VERSION_NUMBER);
al = SSL_AD_PROTOCOL_VERSION;
goto fatal_err;
}
s->s3->hs.peer_legacy_version = client_version;
s->version = shared_version;
s->s3->hs.negotiated_tls_version = ssl_tls_version(shared_version);
if (s->s3->hs.negotiated_tls_version == 0) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto err;
}
if ((method = ssl_get_method(shared_version)) == NULL) {
SSLerror(s, ERR_R_INTERNAL_ERROR);
goto err;
}
s->method = method;
/*
* If we require cookies (DTLS) and this ClientHello does not contain
* one, just return since we do not want to allocate any memory yet.
* So check cookie length...
*/
if (SSL_is_dtls(s)) {
if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
if (CBS_len(&cookie) == 0)
return (1);
}
}
if (!CBS_write_bytes(&client_random, s->s3->client_random,
sizeof(s->s3->client_random), NULL))
goto err;
s->hit = 0;
/*
* Versions before 0.9.7 always allow clients to resume sessions in
* renegotiation. 0.9.7 and later allow this by default, but optionally
* ignore resumption requests with flag
* SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag
* rather than a change to default behavior so that applications
* relying on this for security won't even compile against older
* library versions).
*
* 1.0.1 and later also have a function SSL_renegotiate_abbreviated()
* to request renegotiation but not a new session (s->new_session
* remains unset): for servers, this essentially just means that the
* SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
* ignored.
*/
if ((s->new_session && (s->options &
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
if (!ssl_get_new_session(s, 1))
goto err;
} else {
CBS ext_block;
CBS_dup(&cbs, &ext_block);
i = ssl_get_prev_session(s, &session_id, &ext_block, &al);
if (i == 1) { /* previous session */
s->hit = 1;
} else if (i == -1)
goto fatal_err;
else {
/* i == 0 */
if (!ssl_get_new_session(s, 1))
goto err;
}
}
if (SSL_is_dtls(s)) {
/*
* The ClientHello may contain a cookie even if the HelloVerify
* message has not been sent - make sure that it does not cause
* an overflow.
*/
if (CBS_len(&cookie) > sizeof(s->d1->rcvd_cookie)) {
al = SSL_AD_DECODE_ERROR;
SSLerror(s, SSL_R_COOKIE_MISMATCH);
goto fatal_err;
}
/* Verify the cookie if appropriate option is set. */
if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
CBS_len(&cookie) > 0) {
size_t cookie_len;
/* XXX - rcvd_cookie seems to only be used here... */
if (!CBS_write_bytes(&cookie, s->d1->rcvd_cookie,
sizeof(s->d1->rcvd_cookie), &cookie_len))
goto err;
if (s->ctx->app_verify_cookie_cb != NULL) {
if (s->ctx->app_verify_cookie_cb(s,
s->d1->rcvd_cookie, cookie_len) == 0) {
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_COOKIE_MISMATCH);
goto fatal_err;
}
/* else cookie verification succeeded */
/* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */
} else if (timingsafe_memcmp(s->d1->rcvd_cookie,
s->d1->cookie, s->d1->cookie_len) != 0) {
/* default verification */
al = SSL_AD_HANDSHAKE_FAILURE;
SSLerror(s, SSL_R_COOKIE_MISMATCH);
goto fatal_err;
}
cookie_valid = 1;
}
}
/* XXX - This logic seems wrong... */
if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) {
/* we need a cipher if we are not resuming a session */
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED);
goto fatal_err;
}
if (CBS_len(&cipher_suites) > 0) {
if ((ciphers = ssl_bytes_to_cipher_list(s,
&cipher_suites)) == NULL)
goto err;
}
/* If it is a hit, check that the cipher is in the list */
/* XXX - CBS_len(&cipher_suites) will always be zero here... */
if (s->hit && CBS_len(&cipher_suites) > 0) {
j = 0;
for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
c = sk_SSL_CIPHER_value(ciphers, i);
if (c->value == s->session->cipher_value) {
j = 1;
break;
}
}
if (j == 0) {
/*
* We need to have the cipher in the cipher
* list if we are asked to reuse it
*/
al = SSL_AD_ILLEGAL_PARAMETER;
SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING);
goto fatal_err;
}
}
comp_null = 0;
while (CBS_len(&compression_methods) > 0) {