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Rewrite StreamPeerSSL with SSLContext helper class

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connect_to_stream now accepts optional parameter to specify which
certificates to trust.
Implement accept_stream (SSL server) with key/cert parameters to specify
the RSA key and X509 certificate resources.
This commit is contained in:
Fabio Alessandrelli
2019-07-19 15:29:57 +02:00
parent dd8107caa4
commit ce5a3f56a6
9 changed files with 271 additions and 166 deletions
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148
modules/mbedtls/ssl_context_mbedtls.cpp Normal file
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/*************************************************************************/
/* ssl_context_mbed_tls.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "ssl_context_mbedtls.h"
static void my_debug(void *ctx, int level,
const char *file, int line,
const char *str) {
printf("%s:%04d: %s", file, line, str);
fflush(stdout);
}
Error SSLContextMbedTLS::_setup(int p_endpoint, int p_transport, int p_authmode) {
ERR_FAIL_COND_V_MSG(inited, ERR_ALREADY_IN_USE, "This SSL context is already active");
mbedtls_ssl_init(&ssl);
mbedtls_ssl_config_init(&conf);
mbedtls_ctr_drbg_init(&ctr_drbg);
mbedtls_entropy_init(&entropy);
inited = true;
int ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, NULL, 0);
if (ret != 0) {
clear(); // Never leave unusable resources around.
ERR_FAIL_V_MSG(FAILED, "mbedtls_ctr_drbg_seed returned an error" + itos(ret));
}
ret = mbedtls_ssl_config_defaults(&conf, p_endpoint, p_transport, MBEDTLS_SSL_PRESET_DEFAULT);
if (ret != 0) {
clear();
ERR_FAIL_V_MSG(FAILED, "mbedtls_ssl_config_defaults returned an error" + itos(ret));
}
mbedtls_ssl_conf_authmode(&conf, p_authmode);
mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
return OK;
}
Error SSLContextMbedTLS::init_server(int p_transport, int p_authmode, Ref<CryptoKeyMbedTLS> p_pkey, Ref<X509CertificateMbedTLS> p_cert) {
ERR_FAIL_COND_V(!p_pkey.is_valid(), ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(!p_cert.is_valid(), ERR_INVALID_PARAMETER);
Error err = _setup(MBEDTLS_SSL_IS_SERVER, p_transport, p_authmode);
ERR_FAIL_COND_V(err != OK, err);
// Locking key and certificate(s)
pkey = p_pkey;
certs = p_cert;
if (pkey.is_valid())
pkey->lock();
if (certs.is_valid())
certs->lock();
// Adding key and certificate
int ret = mbedtls_ssl_conf_own_cert(&conf, &(certs->cert), &(pkey->pkey));
if (ret != 0) {
clear();
ERR_FAIL_V_MSG(ERR_INVALID_PARAMETER, "Invalid cert/key combination " + itos(ret));
}
// Adding CA chain if available.
if (certs->cert.next) {
mbedtls_ssl_conf_ca_chain(&conf, certs->cert.next, NULL);
}
mbedtls_ssl_setup(&ssl, &conf);
return OK;
}
Error SSLContextMbedTLS::init_client(int p_transport, int p_authmode, Ref<X509CertificateMbedTLS> p_valid_cas) {
X509CertificateMbedTLS *cas = NULL;
if (certs.is_valid()) {
// Locking CA certificates
certs = p_valid_cas;
certs->lock();
cas = certs.ptr();
} else {
// Fall back to default certificates (no need to lock those).
cas = CryptoMbedTLS::get_default_certificates();
ERR_FAIL_COND_V(cas == NULL, ERR_UNCONFIGURED);
}
Error err = _setup(MBEDTLS_SSL_IS_CLIENT, p_transport, p_authmode);
ERR_FAIL_COND_V(err != OK, err);
// Set valid CAs
mbedtls_ssl_conf_ca_chain(&conf, &(cas->cert), NULL);
mbedtls_ssl_setup(&ssl, &conf);
return OK;
}
void SSLContextMbedTLS::clear() {
if (!inited)
return;
mbedtls_ssl_free(&ssl);
mbedtls_ssl_config_free(&conf);
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
// Unlock and key and certificates
if (certs.is_valid())
certs->unlock();
certs = Ref<X509Certificate>();
if (pkey.is_valid())
pkey->unlock();
pkey = Ref<CryptoKeyMbedTLS>();
inited = false;
}
mbedtls_ssl_context *SSLContextMbedTLS::get_context() {
ERR_FAIL_COND_V(!inited, NULL);
return &ssl;
}
SSLContextMbedTLS::SSLContextMbedTLS() {
inited = false;
}
SSLContextMbedTLS::~SSLContextMbedTLS() {
clear();
}