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Implement non blocking-handshake for StreamPeerSSL

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This commit is contained in:
Fabio Alessandrelli 2018-07-14 22:33:30 +02:00
parent 1fc7973a00
commit 99d0b7ba14
4 changed files with 78 additions and 33 deletions
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17
core/io/stream_peer_ssl.cpp
View file

@ -52,6 +52,14 @@ bool StreamPeerSSL::is_available() {
return available;
}
void StreamPeerSSL::set_blocking_handshake_enabled(bool p_enabled) {
blocking_handshake = p_enabled;
}
bool StreamPeerSSL::is_blocking_handshake_enabled() const {
return blocking_handshake;
}
PoolByteArray StreamPeerSSL::get_project_cert_array() {
PoolByteArray out;
@ -84,16 +92,21 @@ PoolByteArray StreamPeerSSL::get_project_cert_array() {
void StreamPeerSSL::_bind_methods() {
ClassDB::bind_method(D_METHOD("poll"), &StreamPeerSSL::poll);
ClassDB::bind_method(D_METHOD("accept_stream", "stream"), &StreamPeerSSL::accept_stream);
ClassDB::bind_method(D_METHOD("accept_stream"), &StreamPeerSSL::accept_stream);
ClassDB::bind_method(D_METHOD("connect_to_stream", "stream", "validate_certs", "for_hostname"), &StreamPeerSSL::connect_to_stream, DEFVAL(false), DEFVAL(String()));
ClassDB::bind_method(D_METHOD("get_status"), &StreamPeerSSL::get_status);
ClassDB::bind_method(D_METHOD("disconnect_from_stream"), &StreamPeerSSL::disconnect_from_stream);
ClassDB::bind_method(D_METHOD("set_blocking_handshake_enabled", "enabled"), &StreamPeerSSL::set_blocking_handshake_enabled);
ClassDB::bind_method(D_METHOD("is_blocking_handshake_enabled"), &StreamPeerSSL::is_blocking_handshake_enabled);
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "blocking_handshake"), "set_blocking_handshake_enabled", "is_blocking_handshake_enabled");
BIND_ENUM_CONSTANT(STATUS_DISCONNECTED);
BIND_ENUM_CONSTANT(STATUS_CONNECTED);
BIND_ENUM_CONSTANT(STATUS_ERROR_NO_CERTIFICATE);
BIND_ENUM_CONSTANT(STATUS_ERROR);
BIND_ENUM_CONSTANT(STATUS_ERROR_HOSTNAME_MISMATCH);
}
StreamPeerSSL::StreamPeerSSL() {
blocking_handshake = true;
}

8
core/io/stream_peer_ssl.h
View file

@ -49,14 +49,20 @@ protected:
friend class Main;
static bool initialize_certs;
bool blocking_handshake;
public:
enum Status {
STATUS_DISCONNECTED,
STATUS_HANDSHAKING,
STATUS_CONNECTED,
STATUS_ERROR_NO_CERTIFICATE,
STATUS_ERROR,
STATUS_ERROR_HOSTNAME_MISMATCH
};
void set_blocking_handshake_enabled(bool p_enabled);
bool is_blocking_handshake_enabled() const;
virtual void poll() = 0;
virtual Error accept_stream(Ref<StreamPeer> p_base) = 0;
virtual Error connect_to_stream(Ref<StreamPeer> p_base, bool p_validate_certs = false, const String &p_for_hostname = String()) = 0;

80
modules/mbedtls/stream_peer_mbed_tls.cpp
View file

@ -29,6 +29,8 @@
/*************************************************************************/
#include "stream_peer_mbed_tls.h"
#include "mbedtls/platform_util.h"
#include "os/file_access.h"
static void my_debug(void *ctx, int level,
const char *file, int line,
@ -81,6 +83,36 @@ int StreamPeerMbedTLS::bio_recv(void *ctx, unsigned char *buf, size_t len) {
return got;
}
void StreamPeerMbedTLS::_cleanup() {
mbedtls_ssl_free(&ssl);
mbedtls_ssl_config_free(&conf);
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
base = Ref<StreamPeer>();
status = STATUS_DISCONNECTED;
}
Error StreamPeerMbedTLS::_do_handshake() {
int ret = 0;
while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
ERR_PRINTS("TLS handshake error: " + itos(ret));
_print_error(ret);
disconnect_from_stream();
status = STATUS_ERROR;
return FAILED;
} else if (!blocking_handshake) {
// Will retry via poll later
return OK;
}
}
status = STATUS_CONNECTED;
return OK;
}
Error StreamPeerMbedTLS::connect_to_stream(Ref<StreamPeer> p_base, bool p_validate_certs, const String &p_for_hostname) {
base = p_base;
@ -95,6 +127,7 @@ Error StreamPeerMbedTLS::connect_to_stream(Ref<StreamPeer> p_base, bool p_valida
ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, NULL, 0);
if (ret != 0) {
ERR_PRINTS(" failed\n ! mbedtls_ctr_drbg_seed returned an error" + itos(ret));
_cleanup();
return FAILED;
}
@ -112,29 +145,24 @@ Error StreamPeerMbedTLS::connect_to_stream(Ref<StreamPeer> p_base, bool p_valida
mbedtls_ssl_set_bio(&ssl, this, bio_send, bio_recv, NULL);
while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
ERR_PRINTS("TLS handshake error: " + itos(ret));
_print_error(ret);
status = STATUS_ERROR_HOSTNAME_MISMATCH;
return FAILED;
}
}
status = STATUS_HANDSHAKING;
connected = true;
status = STATUS_CONNECTED;
if ((ret = _do_handshake()) != OK) {
status = STATUS_ERROR_HOSTNAME_MISMATCH;
return FAILED;
}
return OK;
}
Error StreamPeerMbedTLS::accept_stream(Ref<StreamPeer> p_base) {
return ERR_UNAVAILABLE;
return OK;
}
Error StreamPeerMbedTLS::put_data(const uint8_t *p_data, int p_bytes) {
ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED);
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
Error err;
int sent = 0;
@ -155,7 +183,7 @@ Error StreamPeerMbedTLS::put_data(const uint8_t *p_data, int p_bytes) {
Error StreamPeerMbedTLS::put_partial_data(const uint8_t *p_data, int p_bytes, int &r_sent) {
ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED);
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
r_sent = 0;
@ -177,7 +205,7 @@ Error StreamPeerMbedTLS::put_partial_data(const uint8_t *p_data, int p_bytes, in
Error StreamPeerMbedTLS::get_data(uint8_t *p_buffer, int p_bytes) {
ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED);
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
Error err;
@ -199,7 +227,7 @@ Error StreamPeerMbedTLS::get_data(uint8_t *p_buffer, int p_bytes) {
Error StreamPeerMbedTLS::get_partial_data(uint8_t *p_buffer, int p_bytes, int &r_received) {
ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED);
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
r_received = 0;
@ -218,27 +246,30 @@ Error StreamPeerMbedTLS::get_partial_data(uint8_t *p_buffer, int p_bytes, int &r
void StreamPeerMbedTLS::poll() {
ERR_FAIL_COND(!connected);
ERR_FAIL_COND(status != STATUS_CONNECTED && status != STATUS_HANDSHAKING);
ERR_FAIL_COND(!base.is_valid());
if (status == STATUS_HANDSHAKING) {
_do_handshake();
return;
}
int ret = mbedtls_ssl_read(&ssl, NULL, 0);
if (ret < 0 && ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
_print_error(ret);
disconnect_from_stream();
return;
}
}
int StreamPeerMbedTLS::get_available_bytes() const {
ERR_FAIL_COND_V(!connected, 0);
ERR_FAIL_COND_V(status != STATUS_CONNECTED, 0);
return mbedtls_ssl_get_bytes_avail(&ssl);
}
StreamPeerMbedTLS::StreamPeerMbedTLS() {
connected = false;
status = STATUS_DISCONNECTED;
}
@ -248,17 +279,10 @@ StreamPeerMbedTLS::~StreamPeerMbedTLS() {
void StreamPeerMbedTLS::disconnect_from_stream() {
if (!connected)
if (status != STATUS_CONNECTED && status != STATUS_HANDSHAKING)
return;
mbedtls_ssl_free(&ssl);
mbedtls_ssl_config_free(&conf);
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
base = Ref<StreamPeer>();
connected = false;
status = STATUS_DISCONNECTED;
_cleanup();
}
StreamPeerMbedTLS::Status StreamPeerMbedTLS::get_status() const {

6
modules/mbedtls/stream_peer_mbed_tls.h
View file

@ -48,8 +48,6 @@ private:
Status status;
String hostname;
bool connected;
Ref<StreamPeer> base;
static StreamPeerSSL *_create_func();
@ -57,9 +55,11 @@ private:
static int bio_recv(void *ctx, unsigned char *buf, size_t len);
static int bio_send(void *ctx, const unsigned char *buf, size_t len);
void _cleanup();
protected:
static mbedtls_x509_crt cacert;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_context ssl;
@ -67,6 +67,8 @@ protected:
static void _bind_methods();
Error _do_handshake();
public:
virtual void poll();
virtual Error accept_stream(Ref<StreamPeer> p_base);