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boringssl/ssl/tls13_both.c
Adam Langley 2a3b3439c8 Move X509-related verification code into ssl_x509.c. 
Change-Id: I9f94033036550ae85c98cd4e09584972b4441b5d
Reviewed-on: https://boringssl-review.googlesource.com/13971
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
2017-02-28 22:57:34 +00:00

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/* Copyright (c) 2016, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <openssl/ssl.h>
#include <assert.h>
#include <string.h>
#include <openssl/bytestring.h>
#include <openssl/err.h>
#include <openssl/hkdf.h>
#include <openssl/mem.h>
#include <openssl/stack.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "../crypto/internal.h"
#include "internal.h"
/* kMaxKeyUpdates is the number of consecutive KeyUpdates that will be
* processed. Without this limit an attacker could force unbounded processing
* without being able to return application data. */
static const uint8_t kMaxKeyUpdates = 32;
int tls13_handshake(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
for (;;) {
/* Resolve the operation the handshake was waiting on. */
switch (hs->wait) {
case ssl_hs_error:
OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
return -1;
case ssl_hs_flush:
case ssl_hs_flush_and_read_message: {
int ret = ssl->method->flush_flight(ssl);
if (ret <= 0) {
return ret;
}
if (hs->wait != ssl_hs_flush_and_read_message) {
break;
}
ssl->method->expect_flight(ssl);
hs->wait = ssl_hs_read_message;
/* Fall-through. */
}
case ssl_hs_read_message: {
int ret = ssl->method->ssl_get_message(ssl);
if (ret <= 0) {
return ret;
}
break;
}
case ssl_hs_x509_lookup:
ssl->rwstate = SSL_X509_LOOKUP;
hs->wait = ssl_hs_ok;
return -1;
case ssl_hs_channel_id_lookup:
ssl->rwstate = SSL_CHANNEL_ID_LOOKUP;
hs->wait = ssl_hs_ok;
return -1;
case ssl_hs_private_key_operation:
ssl->rwstate = SSL_PRIVATE_KEY_OPERATION;
hs->wait = ssl_hs_ok;
return -1;
case ssl_hs_ok:
break;
}
/* Run the state machine again. */
hs->wait = hs->do_tls13_handshake(hs);
if (hs->wait == ssl_hs_error) {
/* Don't loop around to avoid a stray |SSL_R_SSL_HANDSHAKE_FAILURE| the
* first time around. */
return -1;
}
if (hs->wait == ssl_hs_ok) {
/* The handshake has completed. */
return 1;
}
/* Otherwise, loop to the beginning and resolve what was blocking the
* handshake. */
}
}
int tls13_get_cert_verify_signature_input(
SSL_HANDSHAKE *hs, uint8_t **out, size_t *out_len,
enum ssl_cert_verify_context_t cert_verify_context) {
CBB cbb;
if (!CBB_init(&cbb, 64 + 33 + 1 + 2 * EVP_MAX_MD_SIZE)) {
goto err;
}
for (size_t i = 0; i < 64; i++) {
if (!CBB_add_u8(&cbb, 0x20)) {
goto err;
}
}
const uint8_t *context;
size_t context_len;
if (cert_verify_context == ssl_cert_verify_server) {
/* Include the NUL byte. */
static const char kContext[] = "TLS 1.3, server CertificateVerify";
context = (const uint8_t *)kContext;
context_len = sizeof(kContext);
} else if (cert_verify_context == ssl_cert_verify_client) {
static const char kContext[] = "TLS 1.3, client CertificateVerify";
context = (const uint8_t *)kContext;
context_len = sizeof(kContext);
} else if (cert_verify_context == ssl_cert_verify_channel_id) {
static const char kContext[] = "TLS 1.3, Channel ID";
context = (const uint8_t *)kContext;
context_len = sizeof(kContext);
} else {
goto err;
}
if (!CBB_add_bytes(&cbb, context, context_len)) {
goto err;
}
uint8_t context_hash[EVP_MAX_MD_SIZE];
size_t context_hash_len;
if (!SSL_TRANSCRIPT_get_hash(&hs->transcript, context_hash,
&context_hash_len) ||
!CBB_add_bytes(&cbb, context_hash, context_hash_len) ||
!CBB_finish(&cbb, out, out_len)) {
goto err;
}
return 1;
err:
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
CBB_cleanup(&cbb);
return 0;
}
int tls13_process_certificate(SSL_HANDSHAKE *hs, int allow_anonymous) {
SSL *const ssl = hs->ssl;
CBS cbs, context, certificate_list;
CBS_init(&cbs, ssl->init_msg, ssl->init_num);
if (!CBS_get_u8_length_prefixed(&cbs, &context) ||
CBS_len(&context) != 0) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
return 0;
}
const int retain_sha256 =
ssl->server && ssl->retain_only_sha256_of_client_certs;
int ret = 0;
EVP_PKEY *pkey = NULL;
STACK_OF(CRYPTO_BUFFER) *certs = sk_CRYPTO_BUFFER_new_null();
if (certs == NULL) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!CBS_get_u24_length_prefixed(&cbs, &certificate_list)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
goto err;
}
while (CBS_len(&certificate_list) > 0) {
CBS certificate, extensions;
if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) ||
!CBS_get_u16_length_prefixed(&certificate_list, &extensions) ||
CBS_len(&certificate) == 0) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH);
goto err;
}
if (sk_CRYPTO_BUFFER_num(certs) == 0) {
pkey = ssl_cert_parse_pubkey(&certificate);
if (pkey == NULL) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
goto err;
}
/* TLS 1.3 always uses certificate keys for signing thus the correct
* keyUsage is enforced. */
if (!ssl_cert_check_digital_signature_key_usage(&certificate)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
goto err;
}
if (retain_sha256) {
/* Retain the hash of the leaf certificate if requested. */
SHA256(CBS_data(&certificate), CBS_len(&certificate),
hs->new_session->peer_sha256);
}
}
CRYPTO_BUFFER *buf =
CRYPTO_BUFFER_new_from_CBS(&certificate, ssl->ctx->pool);
if (buf == NULL ||
!sk_CRYPTO_BUFFER_push(certs, buf)) {
CRYPTO_BUFFER_free(buf);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
goto err;
}
/* Parse out the extensions. */
int have_status_request = 0, have_sct = 0;
CBS status_request, sct;
const SSL_EXTENSION_TYPE ext_types[] = {
{TLSEXT_TYPE_status_request, &have_status_request, &status_request},
{TLSEXT_TYPE_certificate_timestamp, &have_sct, &sct},
};
uint8_t alert = SSL_AD_DECODE_ERROR;
if (!ssl_parse_extensions(&extensions, &alert, ext_types,
OPENSSL_ARRAY_SIZE(ext_types),
0 /* reject unknown */)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
goto err;
}
/* All Certificate extensions are parsed, but only the leaf extensions are
* stored. */
if (have_status_request) {
if (ssl->server || !ssl->ocsp_stapling_enabled) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION);
goto err;
}
uint8_t status_type;
CBS ocsp_response;
if (!CBS_get_u8(&status_request, &status_type) ||
status_type != TLSEXT_STATUSTYPE_ocsp ||
!CBS_get_u24_length_prefixed(&status_request, &ocsp_response) ||
CBS_len(&ocsp_response) == 0 ||
CBS_len(&status_request) != 0) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
goto err;
}
if (sk_CRYPTO_BUFFER_num(certs) == 1 &&
!CBS_stow(&ocsp_response, &hs->new_session->ocsp_response,
&hs->new_session->ocsp_response_length)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
goto err;
}
}
if (have_sct) {
if (ssl->server || !ssl->signed_cert_timestamps_enabled) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION);
goto err;
}
if (!ssl_is_sct_list_valid(&sct)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_ERROR_PARSING_EXTENSION);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
goto err;
}
if (sk_CRYPTO_BUFFER_num(certs) == 1 &&
!CBS_stow(
&sct, &hs->new_session->tlsext_signed_cert_timestamp_list,
&hs->new_session->tlsext_signed_cert_timestamp_list_length)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
goto err;
}
}
}
if (CBS_len(&cbs) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
goto err;
}
EVP_PKEY_free(hs->peer_pubkey);
hs->peer_pubkey = pkey;
pkey = NULL;
sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free);
hs->new_session->certs = certs;
certs = NULL;
if (!ssl->ctx->x509_method->session_cache_objects(hs->new_session)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
goto err;
}
if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) == 0) {
if (!allow_anonymous) {
OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_CERTIFICATE_REQUIRED);
goto err;
}
/* OpenSSL returns X509_V_OK when no certificates are requested. This is
* classed by them as a bug, but it's assumed by at least NGINX. */
hs->new_session->verify_result = X509_V_OK;
/* No certificate, so nothing more to do. */
ret = 1;
goto err;
}
hs->new_session->peer_sha256_valid = retain_sha256;
if (!ssl->ctx->x509_method->session_verify_cert_chain(hs->new_session,
ssl)) {
goto err;
}
ret = 1;
err:
sk_CRYPTO_BUFFER_pop_free(certs, CRYPTO_BUFFER_free);
EVP_PKEY_free(pkey);
return ret;
}
int tls13_process_certificate_verify(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
int ret = 0;
uint8_t *msg = NULL;
size_t msg_len;
if (hs->peer_pubkey == NULL) {
goto err;
}
CBS cbs, signature;
uint16_t signature_algorithm;
CBS_init(&cbs, ssl->init_msg, ssl->init_num);
if (!CBS_get_u16(&cbs, &signature_algorithm) ||
!CBS_get_u16_length_prefixed(&cbs, &signature) ||
CBS_len(&cbs) != 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
goto err;
}
int al;
if (!tls12_check_peer_sigalg(ssl, &al, signature_algorithm)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, al);
goto err;
}
hs->new_session->peer_signature_algorithm = signature_algorithm;
if (!tls13_get_cert_verify_signature_input(
hs, &msg, &msg_len,
ssl->server ? ssl_cert_verify_client : ssl_cert_verify_server)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
goto err;
}
int sig_ok =
ssl_public_key_verify(ssl, CBS_data(&signature), CBS_len(&signature),
signature_algorithm, hs->peer_pubkey, msg, msg_len);
#if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
sig_ok = 1;
ERR_clear_error();
#endif
if (!sig_ok) {
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
goto err;
}
ret = 1;
err:
OPENSSL_free(msg);
return ret;
}
int tls13_process_finished(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
uint8_t verify_data[EVP_MAX_MD_SIZE];
size_t verify_data_len;
if (!tls13_finished_mac(hs, verify_data, &verify_data_len, !ssl->server)) {
return 0;
}
int finished_ok =
ssl->init_num == verify_data_len &&
CRYPTO_memcmp(verify_data, ssl->init_msg, verify_data_len) == 0;
#if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
finished_ok = 1;
#endif
if (!finished_ok) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED);
return 0;
}
return 1;
}
int tls13_add_certificate(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
CBB cbb, body, certificate_list;
if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_CERTIFICATE) ||
/* The request context is always empty in the handshake. */
!CBB_add_u8(&body, 0) ||
!CBB_add_u24_length_prefixed(&body, &certificate_list)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
goto err;
}
if (!ssl_has_certificate(ssl)) {
if (!ssl_add_message_cbb(ssl, &cbb)) {
goto err;
}
return 1;
}
CERT *cert = ssl->cert;
CRYPTO_BUFFER *leaf_buf = sk_CRYPTO_BUFFER_value(cert->chain, 0);
CBB leaf, extensions;
if (!CBB_add_u24_length_prefixed(&certificate_list, &leaf) ||
!CBB_add_bytes(&leaf, CRYPTO_BUFFER_data(leaf_buf),
CRYPTO_BUFFER_len(leaf_buf)) ||
!CBB_add_u16_length_prefixed(&certificate_list, &extensions)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
goto err;
}
if (hs->scts_requested && ssl->cert->signed_cert_timestamp_list != NULL) {
CBB contents;
if (!CBB_add_u16(&extensions, TLSEXT_TYPE_certificate_timestamp) ||
!CBB_add_u16_length_prefixed(&extensions, &contents) ||
!CBB_add_bytes(
&contents,
CRYPTO_BUFFER_data(ssl->cert->signed_cert_timestamp_list),
CRYPTO_BUFFER_len(ssl->cert->signed_cert_timestamp_list)) ||
!CBB_flush(&extensions)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
goto err;
}
}
if (hs->ocsp_stapling_requested &&
ssl->cert->ocsp_response != NULL) {
CBB contents, ocsp_response;
if (!CBB_add_u16(&extensions, TLSEXT_TYPE_status_request) ||
!CBB_add_u16_length_prefixed(&extensions, &contents) ||
!CBB_add_u8(&contents, TLSEXT_STATUSTYPE_ocsp) ||
!CBB_add_u24_length_prefixed(&contents, &ocsp_response) ||
!CBB_add_bytes(&ocsp_response,
CRYPTO_BUFFER_data(ssl->cert->ocsp_response),
CRYPTO_BUFFER_len(ssl->cert->ocsp_response)) ||
!CBB_flush(&extensions)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
goto err;
}
}
for (size_t i = 1; i < sk_CRYPTO_BUFFER_num(cert->chain); i++) {
CRYPTO_BUFFER *cert_buf = sk_CRYPTO_BUFFER_value(cert->chain, i);
CBB child;
if (!CBB_add_u24_length_prefixed(&certificate_list, &child) ||
!CBB_add_bytes(&child, CRYPTO_BUFFER_data(cert_buf),
CRYPTO_BUFFER_len(cert_buf)) ||
!CBB_add_u16(&certificate_list, 0 /* no extensions */)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
goto err;
}
}
if (!ssl_add_message_cbb(ssl, &cbb)) {
goto err;
}
return 1;
err:
CBB_cleanup(&cbb);
return 0;
}
enum ssl_private_key_result_t tls13_add_certificate_verify(SSL_HANDSHAKE *hs,
int is_first_run) {
SSL *const ssl = hs->ssl;
enum ssl_private_key_result_t ret = ssl_private_key_failure;
uint8_t *msg = NULL;
size_t msg_len;
CBB cbb, body;
CBB_zero(&cbb);
uint16_t signature_algorithm;
if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) {
goto err;
}
if (!ssl->method->init_message(ssl, &cbb, &body,
SSL3_MT_CERTIFICATE_VERIFY) ||
!CBB_add_u16(&body, signature_algorithm)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
goto err;
}
/* Sign the digest. */
CBB child;
const size_t max_sig_len = ssl_private_key_max_signature_len(ssl);
uint8_t *sig;
size_t sig_len;
if (!CBB_add_u16_length_prefixed(&body, &child) ||
!CBB_reserve(&child, &sig, max_sig_len)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
goto err;
}
enum ssl_private_key_result_t sign_result;
if (is_first_run) {
if (!tls13_get_cert_verify_signature_input(
hs, &msg, &msg_len,
ssl->server ? ssl_cert_verify_server : ssl_cert_verify_client)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
goto err;
}
sign_result = ssl_private_key_sign(ssl, sig, &sig_len, max_sig_len,
signature_algorithm, msg, msg_len);
} else {
sign_result = ssl_private_key_complete(ssl, sig, &sig_len, max_sig_len);
}
if (sign_result != ssl_private_key_success) {
ret = sign_result;
goto err;
}
if (!CBB_did_write(&child, sig_len) ||
!ssl_add_message_cbb(ssl, &cbb)) {
goto err;
}
ret = ssl_private_key_success;
err:
CBB_cleanup(&cbb);
OPENSSL_free(msg);
return ret;
}
int tls13_add_finished(SSL_HANDSHAKE *hs) {
SSL *const ssl = hs->ssl;
size_t verify_data_len;
uint8_t verify_data[EVP_MAX_MD_SIZE];
if (!tls13_finished_mac(hs, verify_data, &verify_data_len, ssl->server)) {
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED);
return 0;
}
CBB cbb, body;
if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_FINISHED) ||
!CBB_add_bytes(&body, verify_data, verify_data_len) ||
!ssl_add_message_cbb(ssl, &cbb)) {
CBB_cleanup(&cbb);
return 0;
}
return 1;
}
static int tls13_receive_key_update(SSL *ssl) {
CBS cbs;
uint8_t key_update_request;
CBS_init(&cbs, ssl->init_msg, ssl->init_num);
if (!CBS_get_u8(&cbs, &key_update_request) ||
CBS_len(&cbs) != 0 ||
(key_update_request != SSL_KEY_UPDATE_NOT_REQUESTED &&
key_update_request != SSL_KEY_UPDATE_REQUESTED)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
return 0;
}
/* TODO(svaldez): Send KeyUpdate if |key_update_request| is
* |SSL_KEY_UPDATE_REQUESTED|. */
return tls13_rotate_traffic_key(ssl, evp_aead_open);
}
int tls13_post_handshake(SSL *ssl) {
if (ssl->s3->tmp.message_type == SSL3_MT_KEY_UPDATE) {
ssl->s3->key_update_count++;
if (ssl->s3->key_update_count > kMaxKeyUpdates) {
OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_KEY_UPDATES);
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
return 0;
}
return tls13_receive_key_update(ssl);
}
ssl->s3->key_update_count = 0;
if (ssl->s3->tmp.message_type == SSL3_MT_NEW_SESSION_TICKET &&
!ssl->server) {
return tls13_process_new_session_ticket(ssl);
}
// TODO(svaldez): Handle post-handshake authentication.
ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE);
return 0;
}
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