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ssl_lib.cc
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// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
// Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
// Copyright 2005 Nokia. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <openssl/ssl.h>
#include <algorithm>
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/bytestring.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/lhash.h>
#include <openssl/mem.h>
#include <openssl/rand.h>
#include "../crypto/internal.h"
#include "internal.h"
#if defined(OPENSSL_WINDOWS)
#include <sys/timeb.h>
#else
#include <sys/socket.h>
#include <sys/time.h>
#endif
BSSL_NAMESPACE_BEGIN
static_assert(SSL3_RT_MAX_ENCRYPTED_OVERHEAD >=
SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD,
"max overheads are inconsistent");
// |SSL_R_UNKNOWN_PROTOCOL| is no longer emitted, but continue to define it
// to avoid downstream churn.
OPENSSL_DECLARE_ERROR_REASON(SSL, UNKNOWN_PROTOCOL)
// The following errors are no longer emitted, but are used in nginx without
// #ifdefs.
OPENSSL_DECLARE_ERROR_REASON(SSL, BLOCK_CIPHER_PAD_IS_WRONG)
OPENSSL_DECLARE_ERROR_REASON(SSL, NO_CIPHERS_SPECIFIED)
// Some error codes are special. Ensure the make_errors.go script never
// regresses this.
static_assert(SSL_R_TLSV1_ALERT_NO_RENEGOTIATION ==
SSL_AD_NO_RENEGOTIATION + SSL_AD_REASON_OFFSET,
"alert reason code mismatch");
// kMaxHandshakeSize is the maximum size, in bytes, of a handshake message.
static const size_t kMaxHandshakeSize = (1u << 24) - 1;
static CRYPTO_EX_DATA_CLASS g_ex_data_class_ssl =
CRYPTO_EX_DATA_CLASS_INIT_WITH_APP_DATA;
static CRYPTO_EX_DATA_CLASS g_ex_data_class_ssl_ctx =
CRYPTO_EX_DATA_CLASS_INIT_WITH_APP_DATA;
bool CBBFinishArray(CBB *cbb, Array<uint8_t> *out) {
uint8_t *ptr;
size_t len;
if (!CBB_finish(cbb, &ptr, &len)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
return false;
}
out->Reset(ptr, len);
return true;
}
void ssl_reset_error_state(SSL *ssl) {
// Functions which use |SSL_get_error| must reset I/O and error state on
// entry.
ssl->s3->rwstate = SSL_ERROR_NONE;
ERR_clear_error();
ERR_clear_system_error();
}
void ssl_set_read_error(SSL *ssl) {
ssl->s3->read_shutdown = ssl_shutdown_error;
ssl->s3->read_error.reset(ERR_save_state());
}
static bool check_read_error(const SSL *ssl) {
if (ssl->s3->read_shutdown == ssl_shutdown_error) {
ERR_restore_state(ssl->s3->read_error.get());
return false;
}
return true;
}
bool ssl_can_write(const SSL *ssl) {
return !SSL_in_init(ssl) || ssl->s3->hs->can_early_write;
}
bool ssl_can_read(const SSL *ssl) {
return !SSL_in_init(ssl) || ssl->s3->hs->can_early_read;
}
ssl_open_record_t ssl_open_handshake(SSL *ssl, size_t *out_consumed,
uint8_t *out_alert, Span<uint8_t> in) {
*out_consumed = 0;
if (!check_read_error(ssl)) {
*out_alert = 0;
return ssl_open_record_error;
}
auto ret = ssl->method->open_handshake(ssl, out_consumed, out_alert, in);
if (ret == ssl_open_record_error) {
ssl_set_read_error(ssl);
}
return ret;
}
ssl_open_record_t ssl_open_change_cipher_spec(SSL *ssl, size_t *out_consumed,
uint8_t *out_alert,
Span<uint8_t> in) {
*out_consumed = 0;
if (!check_read_error(ssl)) {
*out_alert = 0;
return ssl_open_record_error;
}
auto ret =
ssl->method->open_change_cipher_spec(ssl, out_consumed, out_alert, in);
if (ret == ssl_open_record_error) {
ssl_set_read_error(ssl);
}
return ret;
}
ssl_open_record_t ssl_open_app_data(SSL *ssl, Span<uint8_t> *out,
size_t *out_consumed, uint8_t *out_alert,
Span<uint8_t> in) {
*out_consumed = 0;
if (!check_read_error(ssl)) {
*out_alert = 0;
return ssl_open_record_error;
}
auto ret = ssl->method->open_app_data(ssl, out, out_consumed, out_alert, in);
if (ret == ssl_open_record_error) {
ssl_set_read_error(ssl);
}
return ret;
}
static uint8_t hex_char_consttime(uint8_t b) {
declassify_assert(b < 16);
return constant_time_select_8(constant_time_lt_8(b, 10), b + '0',
b - 10 + 'a');
}
static bool cbb_add_hex_consttime(CBB *cbb, Span<const uint8_t> in) {
uint8_t *out;
if (!CBB_add_space(cbb, &out, in.size() * 2)) {
return false;
}
for (uint8_t b : in) {
*(out++) = hex_char_consttime(b >> 4);
*(out++) = hex_char_consttime(b & 0xf);
}
return true;
}
bool ssl_log_secret(const SSL *ssl, const char *label,
Span<const uint8_t> secret) {
if (ssl->ctx->keylog_callback == NULL) {
return true;
}
ScopedCBB cbb;
Array<uint8_t> line;
auto label_bytes = bssl::StringAsBytes(label);
if (!CBB_init(cbb.get(), strlen(label) + 1 + SSL3_RANDOM_SIZE * 2 + 1 +
secret.size() * 2 + 1) ||
!CBB_add_bytes(cbb.get(), label_bytes.data(), label_bytes.size()) ||
!CBB_add_u8(cbb.get(), ' ') ||
!cbb_add_hex_consttime(cbb.get(), ssl->s3->client_random) ||
!CBB_add_u8(cbb.get(), ' ') ||
// Convert to hex in constant time to avoid leaking |secret|. If the
// callback discards the data, we should not introduce side channels.
!cbb_add_hex_consttime(cbb.get(), secret) ||
!CBB_add_u8(cbb.get(), 0 /* NUL */) ||
!CBBFinishArray(cbb.get(), &line)) {
return false;
}
ssl->ctx->keylog_callback(ssl, reinterpret_cast<const char *>(line.data()));
return true;
}
void ssl_do_info_callback(const SSL *ssl, int type, int value) {
void (*cb)(const SSL *ssl, int type, int value) = NULL;
if (ssl->info_callback != NULL) {
cb = ssl->info_callback;
} else if (ssl->ctx->info_callback != NULL) {
cb = ssl->ctx->info_callback;
}
if (cb != NULL) {
cb(ssl, type, value);
}
}
void ssl_do_msg_callback(const SSL *ssl, int is_write, int content_type,
Span<const uint8_t> in) {
if (ssl->msg_callback == NULL) {
return;
}
// |version| is zero when calling for |SSL3_RT_HEADER| and |SSL2_VERSION| for
// a V2ClientHello.
int version;
switch (content_type) {
case 0:
// V2ClientHello
version = SSL2_VERSION;
break;
case SSL3_RT_HEADER:
version = 0;
break;
default:
version = SSL_version(ssl);
}
ssl->msg_callback(is_write, version, content_type, in.data(), in.size(),
const_cast<SSL *>(ssl), ssl->msg_callback_arg);
}
OPENSSL_timeval ssl_ctx_get_current_time(const SSL_CTX *ctx) {
if (ctx->current_time_cb != NULL) {
// TODO(davidben): Update current_time_cb to use OPENSSL_timeval. See
// https://crbug.com/boringssl/155.
struct timeval clock;
ctx->current_time_cb(nullptr /* ssl */, &clock);
if (clock.tv_sec < 0) {
assert(0);
return {0, 0};
} else {
return {static_cast<uint64_t>(clock.tv_sec),
static_cast<uint32_t>(clock.tv_usec)};
}
}
#if defined(BORINGSSL_UNSAFE_DETERMINISTIC_MODE)
return {1234, 1234};
#elif defined(OPENSSL_WINDOWS)
struct _timeb time;
_ftime(&time);
if (time.time < 0) {
assert(0);
return {0, 0};
} else {
return {static_cast<uint64_t>(time.time),
static_cast<uint32_t>(time.millitm * 1000)};
}
#else
struct timeval clock;
gettimeofday(&clock, NULL);
if (clock.tv_sec < 0) {
assert(0);
return {0, 0};
} else {
return {static_cast<uint64_t>(clock.tv_sec),
static_cast<uint32_t>(clock.tv_usec)};
}
#endif
}
void SSL_CTX_set_handoff_mode(SSL_CTX *ctx, bool on) { ctx->handoff = on; }
static bool ssl_can_renegotiate(const SSL *ssl) {
if (ssl->server || SSL_is_dtls(ssl)) {
return false;
}
if (ssl->s3->version != 0 //
&& ssl_protocol_version(ssl) >= TLS1_3_VERSION) {
return false;
}
// The config has already been shed.
if (!ssl->config) {
return false;
}
switch (ssl->renegotiate_mode) {
case ssl_renegotiate_ignore:
case ssl_renegotiate_never:
return false;
case ssl_renegotiate_freely:
case ssl_renegotiate_explicit:
return true;
case ssl_renegotiate_once:
return ssl->s3->total_renegotiations == 0;
}
assert(0);
return false;
}
static void ssl_maybe_shed_handshake_config(SSL *ssl) {
if (ssl->s3->hs != nullptr || //
ssl->config == nullptr || //
!ssl->config->shed_handshake_config || //
ssl_can_renegotiate(ssl)) {
return;
}
ssl->config.reset();
}
void SSL_set_handoff_mode(SSL *ssl, bool on) {
if (!ssl->config) {
return;
}
ssl->config->handoff = on;
}
bool SSL_get_traffic_secrets(const SSL *ssl,
Span<const uint8_t> *out_read_traffic_secret,
Span<const uint8_t> *out_write_traffic_secret) {
// This API is not well-defined for DTLS 1.3 (see https://crbug.com/42290608)
// or QUIC, where multiple epochs may be alive at once.
if (SSL_is_dtls(ssl) || SSL_is_quic(ssl)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return false;
}
if (!ssl->s3->initial_handshake_complete) {
OPENSSL_PUT_ERROR(SSL, SSL_R_HANDSHAKE_NOT_COMPLETE);
return false;
}
if (SSL_version(ssl) < TLS1_3_VERSION) {
OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SSL_VERSION);
return false;
}
*out_read_traffic_secret = ssl->s3->read_traffic_secret;
*out_write_traffic_secret = ssl->s3->write_traffic_secret;
return true;
}
void SSL_CTX_set_aes_hw_override_for_testing(SSL_CTX *ctx,
bool override_value) {
ctx->aes_hw_override = true;
ctx->aes_hw_override_value = override_value;
}
void SSL_set_aes_hw_override_for_testing(SSL *ssl, bool override_value) {
ssl->config->aes_hw_override = true;
ssl->config->aes_hw_override_value = override_value;
}
BSSL_NAMESPACE_END
using namespace bssl;
int SSL_library_init(void) { return 1; }
int OPENSSL_init_ssl(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) {
return 1;
}
static uint32_t ssl_session_hash(const SSL_SESSION *sess) {
return ssl_hash_session_id(sess->session_id);
}
static int ssl_session_cmp(const SSL_SESSION *a, const SSL_SESSION *b) {
return Span(a->session_id) == b->session_id ? 0 : 1;
}
ssl_ctx_st::ssl_ctx_st(const SSL_METHOD *ssl_method)
: RefCounted(CheckSubClass()),
method(ssl_method->method),
x509_method(ssl_method->x509_method),
retain_only_sha256_of_client_certs(false),
quiet_shutdown(false),
ocsp_stapling_enabled(false),
signed_cert_timestamps_enabled(false),
channel_id_enabled(false),
grease_enabled(false),
permute_extensions(false),
allow_unknown_alpn_protos(false),
false_start_allowed_without_alpn(false),
handoff(false),
enable_early_data(false),
aes_hw_override(false),
aes_hw_override_value(false) {
CRYPTO_MUTEX_init(&lock);
CRYPTO_new_ex_data(&ex_data);
}
ssl_ctx_st::~ssl_ctx_st() {
// Free the internal session cache. Note that this calls the caller-supplied
// remove callback, so we must do it before clearing ex_data. (See ticket
// [openssl.org #212].)
SSL_CTX_flush_sessions(this, 0);
CRYPTO_free_ex_data(&g_ex_data_class_ssl_ctx, this, &ex_data);
CRYPTO_MUTEX_cleanup(&lock);
lh_SSL_SESSION_free(sessions);
x509_method->ssl_ctx_free(this);
}
SSL_CTX *SSL_CTX_new(const SSL_METHOD *method) {
if (method == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_NULL_SSL_METHOD_PASSED);
return nullptr;
}
UniquePtr<SSL_CTX> ret = MakeUnique<SSL_CTX>(method);
if (!ret) {
return nullptr;
}
ret->cert = MakeUnique<CERT>(method->x509_method);
ret->sessions = lh_SSL_SESSION_new(ssl_session_hash, ssl_session_cmp);
ret->client_CA.reset(sk_CRYPTO_BUFFER_new_null());
ret->CA_names.reset(sk_CRYPTO_BUFFER_new_null());
if (ret->cert == nullptr || //
!ret->cert->is_valid() || //
ret->sessions == nullptr || //
ret->client_CA == nullptr || //
ret->CA_names == nullptr || //
!ret->x509_method->ssl_ctx_new(ret.get())) {
return nullptr;
}
if (!SSL_CTX_set_strict_cipher_list(ret.get(), SSL_DEFAULT_CIPHER_LIST) ||
// Lock the SSL_CTX to the specified version, for compatibility with
// legacy uses of SSL_METHOD.
!SSL_CTX_set_max_proto_version(ret.get(), method->version) ||
!SSL_CTX_set_min_proto_version(ret.get(), method->version)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
return nullptr;
}
return ret.release();
}
int SSL_CTX_up_ref(SSL_CTX *ctx) {
ctx->UpRefInternal();
return 1;
}
void SSL_CTX_free(SSL_CTX *ctx) {
if (ctx != nullptr) {
ctx->DecRefInternal();
}
}
ssl_st::ssl_st(SSL_CTX *ctx_arg)
: method(ctx_arg->method),
max_send_fragment(ctx_arg->max_send_fragment),
msg_callback(ctx_arg->msg_callback),
msg_callback_arg(ctx_arg->msg_callback_arg),
ctx(UpRef(ctx_arg)),
session_ctx(UpRef(ctx_arg)),
options(ctx->options),
mode(ctx->mode),
max_cert_list(ctx->max_cert_list),
server(false),
quiet_shutdown(ctx->quiet_shutdown),
enable_early_data(ctx->enable_early_data) {
CRYPTO_new_ex_data(&ex_data);
}
ssl_st::~ssl_st() {
CRYPTO_free_ex_data(&g_ex_data_class_ssl, this, &ex_data);
// |config| refers to |this|, so we must release it earlier.
config.reset();
if (method != NULL) {
method->ssl_free(this);
}
}
SSL *SSL_new(SSL_CTX *ctx) {
if (ctx == nullptr) {
OPENSSL_PUT_ERROR(SSL, SSL_R_NULL_SSL_CTX);
return nullptr;
}
UniquePtr<SSL> ssl = MakeUnique<SSL>(ctx);
if (ssl == nullptr) {
return nullptr;
}
ssl->config = MakeUnique<SSL_CONFIG>(ssl.get());
if (ssl->config == nullptr) {
return nullptr;
}
ssl->config->conf_min_version = ctx->conf_min_version;
ssl->config->conf_max_version = ctx->conf_max_version;
ssl->config->cert = ssl_cert_dup(ctx->cert.get());
if (ssl->config->cert == nullptr) {
return nullptr;
}
ssl->config->verify_mode = ctx->verify_mode;
ssl->config->verify_callback = ctx->default_verify_callback;
ssl->config->custom_verify_callback = ctx->custom_verify_callback;
ssl->config->retain_only_sha256_of_client_certs =
ctx->retain_only_sha256_of_client_certs;
ssl->config->permute_extensions = ctx->permute_extensions;
ssl->config->aes_hw_override = ctx->aes_hw_override;
ssl->config->aes_hw_override_value = ctx->aes_hw_override_value;
ssl->config->compliance_policy = ctx->compliance_policy;
if (!ssl->config->supported_group_list.CopyFrom(ctx->supported_group_list) ||
!ssl->config->alpn_client_proto_list.CopyFrom(
ctx->alpn_client_proto_list) ||
!ssl->config->verify_sigalgs.CopyFrom(ctx->verify_sigalgs)) {
return nullptr;
}
if (ctx->psk_identity_hint) {
ssl->config->psk_identity_hint.reset(
OPENSSL_strdup(ctx->psk_identity_hint.get()));
if (ssl->config->psk_identity_hint == nullptr) {
return nullptr;
}
}
ssl->config->psk_client_callback = ctx->psk_client_callback;
ssl->config->psk_server_callback = ctx->psk_server_callback;
ssl->config->channel_id_enabled = ctx->channel_id_enabled;
ssl->config->channel_id_private = UpRef(ctx->channel_id_private);
ssl->config->signed_cert_timestamps_enabled =
ctx->signed_cert_timestamps_enabled;
ssl->config->ocsp_stapling_enabled = ctx->ocsp_stapling_enabled;
ssl->config->handoff = ctx->handoff;
ssl->quic_method = ctx->quic_method;
if (!ssl->method->ssl_new(ssl.get()) ||
!ssl->ctx->x509_method->ssl_new(ssl->s3->hs.get())) {
return nullptr;
}
return ssl.release();
}
SSL_CONFIG::SSL_CONFIG(SSL *ssl_arg)
: ssl(ssl_arg),
ech_grease_enabled(false),
signed_cert_timestamps_enabled(false),
ocsp_stapling_enabled(false),
channel_id_enabled(false),
enforce_rsa_key_usage(true),
retain_only_sha256_of_client_certs(false),
handoff(false),
shed_handshake_config(false),
jdk11_workaround(false),
quic_use_legacy_codepoint(false),
permute_extensions(false),
alps_use_new_codepoint(false) {
assert(ssl);
}
SSL_CONFIG::~SSL_CONFIG() {
if (ssl->ctx != nullptr) {
ssl->ctx->x509_method->ssl_config_free(this);
}
}
void SSL_free(SSL *ssl) { Delete(ssl); }
void SSL_set_connect_state(SSL *ssl) {
ssl->server = false;
ssl->do_handshake = ssl_client_handshake;
}
void SSL_set_accept_state(SSL *ssl) {
ssl->server = true;
ssl->do_handshake = ssl_server_handshake;
}
void SSL_set0_rbio(SSL *ssl, BIO *rbio) { ssl->rbio.reset(rbio); }
void SSL_set0_wbio(SSL *ssl, BIO *wbio) { ssl->wbio.reset(wbio); }
void SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio) {
// For historical reasons, this function has many different cases in ownership
// handling.
// If nothing has changed, do nothing
if (rbio == SSL_get_rbio(ssl) && wbio == SSL_get_wbio(ssl)) {
return;
}
// If the two arguments are equal, one fewer reference is granted than
// taken.
if (rbio != NULL && rbio == wbio) {
BIO_up_ref(rbio);
}
// If only the wbio is changed, adopt only one reference.
if (rbio == SSL_get_rbio(ssl)) {
SSL_set0_wbio(ssl, wbio);
return;
}
// There is an asymmetry here for historical reasons. If only the rbio is
// changed AND the rbio and wbio were originally different, then we only adopt
// one reference.
if (wbio == SSL_get_wbio(ssl) && SSL_get_rbio(ssl) != SSL_get_wbio(ssl)) {
SSL_set0_rbio(ssl, rbio);
return;
}
// Otherwise, adopt both references.
SSL_set0_rbio(ssl, rbio);
SSL_set0_wbio(ssl, wbio);
}
BIO *SSL_get_rbio(const SSL *ssl) { return ssl->rbio.get(); }
BIO *SSL_get_wbio(const SSL *ssl) { return ssl->wbio.get(); }
size_t SSL_quic_max_handshake_flight_len(const SSL *ssl,
enum ssl_encryption_level_t level) {
// Limits flights to 16K by default when there are no large
// (certificate-carrying) messages.
static const size_t kDefaultLimit = 16384;
switch (level) {
case ssl_encryption_initial:
return kDefaultLimit;
case ssl_encryption_early_data:
// QUIC does not send EndOfEarlyData.
return 0;
case ssl_encryption_handshake:
if (ssl->server) {
// Servers may receive Certificate message if configured to request
// client certificates.
if (!!(ssl->config->verify_mode & SSL_VERIFY_PEER) &&
ssl->max_cert_list > kDefaultLimit) {
return ssl->max_cert_list;
}
} else {
// Clients may receive both Certificate message and a CertificateRequest
// message.
if (2 * ssl->max_cert_list > kDefaultLimit) {
return 2 * ssl->max_cert_list;
}
}
return kDefaultLimit;
case ssl_encryption_application:
// Note there is not actually a bound on the number of NewSessionTickets
// one may send in a row. This level may need more involved flow
// control. See https://github.com/quicwg/base-drafts/issues/1834.
return kDefaultLimit;
}
return 0;
}
enum ssl_encryption_level_t SSL_quic_read_level(const SSL *ssl) {
assert(SSL_is_quic(ssl));
return ssl->s3->quic_read_level;
}
enum ssl_encryption_level_t SSL_quic_write_level(const SSL *ssl) {
assert(SSL_is_quic(ssl));
return ssl->s3->quic_write_level;
}
int SSL_provide_quic_data(SSL *ssl, enum ssl_encryption_level_t level,
const uint8_t *data, size_t len) {
if (!SSL_is_quic(ssl)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
if (level != ssl->s3->quic_read_level) {
OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_ENCRYPTION_LEVEL_RECEIVED);
return 0;
}
size_t new_len = (ssl->s3->hs_buf ? ssl->s3->hs_buf->length : 0) + len;
if (new_len < len ||
new_len > SSL_quic_max_handshake_flight_len(ssl, level)) {
OPENSSL_PUT_ERROR(SSL, SSL_R_EXCESSIVE_MESSAGE_SIZE);
return 0;
}
return tls_append_handshake_data(ssl, Span(data, len));
}
int SSL_do_handshake(SSL *ssl) {
ssl_reset_error_state(ssl);
if (ssl->do_handshake == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_TYPE_NOT_SET);
return -1;
}
if (!SSL_in_init(ssl)) {
return 1;
}
// Run the handshake.
SSL_HANDSHAKE *hs = ssl->s3->hs.get();
bool early_return = false;
int ret = ssl_run_handshake(hs, &early_return);
ssl_do_info_callback(
ssl, ssl->server ? SSL_CB_ACCEPT_EXIT : SSL_CB_CONNECT_EXIT, ret);
if (ret <= 0) {
return ret;
}
// Destroy the handshake object if the handshake has completely finished.
if (!early_return) {
ssl->s3->hs.reset();
ssl_maybe_shed_handshake_config(ssl);
}
return 1;
}
int SSL_connect(SSL *ssl) {
if (ssl->do_handshake == NULL) {
// Not properly initialized yet
SSL_set_connect_state(ssl);
}
return SSL_do_handshake(ssl);
}
int SSL_accept(SSL *ssl) {
if (ssl->do_handshake == NULL) {
// Not properly initialized yet
SSL_set_accept_state(ssl);
}
return SSL_do_handshake(ssl);
}
static int ssl_do_post_handshake(SSL *ssl, const SSLMessage &msg) {
if (ssl_protocol_version(ssl) >= TLS1_3_VERSION) {
return tls13_post_handshake(ssl, msg);
}
// Check for renegotiation on the server before parsing to use the correct
// error. Renegotiation is triggered by a different message for servers.
if (ssl->server) {
OPENSSL_PUT_ERROR(SSL, SSL_R_NO_RENEGOTIATION);
ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_NO_RENEGOTIATION);
return 0;
}
if (msg.type != SSL3_MT_HELLO_REQUEST || CBS_len(&msg.body) != 0) {
ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_HELLO_REQUEST);
return 0;
}
if (ssl->renegotiate_mode == ssl_renegotiate_ignore) {
return 1; // Ignore the HelloRequest.
}
ssl->s3->renegotiate_pending = true;
if (ssl->renegotiate_mode == ssl_renegotiate_explicit) {
return 1; // Handle it later.
}
if (!SSL_renegotiate(ssl)) {
ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_NO_RENEGOTIATION);
return 0;
}
return 1;
}
int SSL_process_quic_post_handshake(SSL *ssl) {
ssl_reset_error_state(ssl);
if (!SSL_is_quic(ssl) || SSL_in_init(ssl)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
// Replay post-handshake message errors.
if (!check_read_error(ssl)) {
return 0;
}
// Process any buffered post-handshake messages.
SSLMessage msg;
while (ssl->method->get_message(ssl, &msg)) {
// Handle the post-handshake message and try again.
if (!ssl_do_post_handshake(ssl, msg)) {
ssl_set_read_error(ssl);
return 0;
}
ssl->method->next_message(ssl);
}
return 1;
}
static int ssl_read_impl(SSL *ssl) {
ssl_reset_error_state(ssl);
if (ssl->do_handshake == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNINITIALIZED);
return -1;
}
// Replay post-handshake message errors.
if (!check_read_error(ssl)) {
return -1;
}
while (ssl->s3->pending_app_data.empty()) {
if (ssl->s3->renegotiate_pending) {
ssl->s3->rwstate = SSL_ERROR_WANT_RENEGOTIATE;
return -1;
}
// If a read triggered a DTLS ACK or retransmit, resolve that before reading
// more.
if (SSL_is_dtls(ssl)) {
int ret = ssl->method->flush(ssl);
if (ret <= 0) {
return ret;
}
}
// Complete the current handshake, if any. False Start will cause
// |SSL_do_handshake| to return mid-handshake, so this may require multiple
// iterations.
while (!ssl_can_read(ssl)) {
int ret = SSL_do_handshake(ssl);
if (ret < 0) {
return ret;
}
if (ret == 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
return -1;
}
}
// Process any buffered post-handshake messages.
SSLMessage msg;
if (ssl->method->get_message(ssl, &msg)) {
// If we received an interrupt in early read (EndOfEarlyData), loop again
// for the handshake to process it.
if (SSL_in_init(ssl)) {
ssl->s3->hs->can_early_read = false;
continue;
}
// Handle the post-handshake message and try again.
if (!ssl_do_post_handshake(ssl, msg)) {
ssl_set_read_error(ssl);
return -1;
}
ssl->method->next_message(ssl);
continue; // Loop again. We may have begun a new handshake.
}
uint8_t alert = SSL_AD_DECODE_ERROR;
size_t consumed = 0;
auto ret = ssl_open_app_data(ssl, &ssl->s3->pending_app_data, &consumed,
&alert, ssl->s3->read_buffer.span());
bool retry;
int bio_ret = ssl_handle_open_record(ssl, &retry, ret, consumed, alert);
if (bio_ret <= 0) {
return bio_ret;
}
if (!retry) {
assert(!ssl->s3->pending_app_data.empty());
ssl->s3->key_update_count = 0;
}
}
return 1;
}
int SSL_read(SSL *ssl, void *buf, int num) {
int ret = SSL_peek(ssl, buf, num);
if (ret <= 0) {
return ret;
}
// TODO(davidben): In DTLS, should the rest of the record be discarded? DTLS
// is not a stream. See https://crbug.com/boringssl/65.
ssl->s3->pending_app_data =
ssl->s3->pending_app_data.subspan(static_cast<size_t>(ret));
if (ssl->s3->pending_app_data.empty()) {
ssl->s3->read_buffer.DiscardConsumed();
}
return ret;
}
int SSL_peek(SSL *ssl, void *buf, int num) {
if (SSL_is_quic(ssl)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return -1;
}
int ret = ssl_read_impl(ssl);
if (ret <= 0) {
return ret;
}
if (num <= 0) {
return num;
}
size_t todo =
std::min(ssl->s3->pending_app_data.size(), static_cast<size_t>(num));
OPENSSL_memcpy(buf, ssl->s3->pending_app_data.data(), todo);
return static_cast<int>(todo);
}
int SSL_write(SSL *ssl, const void *buf, int num) {
ssl_reset_error_state(ssl);
if (SSL_is_quic(ssl)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return -1;
}
if (ssl->do_handshake == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNINITIALIZED);
return -1;
}
int ret = 0;
size_t bytes_written = 0;
bool needs_handshake = false;
do {
// If necessary, complete the handshake implicitly.
if (!ssl_can_write(ssl)) {
ret = SSL_do_handshake(ssl);
if (ret < 0) {
return ret;
}
if (ret == 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
return -1;
}
}
if (num < 0) {
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_LENGTH);
return -1;
}
ret = ssl->method->write_app_data(
ssl, &needs_handshake, &bytes_written,
Span(static_cast<const uint8_t *>(buf), static_cast<size_t>(num)));
} while (needs_handshake);
return ret <= 0 ? ret : static_cast<int>(bytes_written);
}
int SSL_key_update(SSL *ssl, int request_type) {
ssl_reset_error_state(ssl);
if (ssl->do_handshake == NULL) {
OPENSSL_PUT_ERROR(SSL, SSL_R_UNINITIALIZED);
return 0;
}
if (SSL_is_quic(ssl)) {
OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
return 0;
}
if (!ssl->s3->initial_handshake_complete) {
OPENSSL_PUT_ERROR(SSL, SSL_R_HANDSHAKE_NOT_COMPLETE);
return 0;
}
if (ssl_protocol_version(ssl) < TLS1_3_VERSION) {
OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SSL_VERSION);
return 0;
}
return tls13_add_key_update(ssl, request_type);
}
int SSL_shutdown(SSL *ssl) {