612 lines
17 KiB
C++
612 lines
17 KiB
C++
/*************************************************************************/
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/* stream_peer_openssl.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "stream_peer_openssl.h"
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//hostname matching code from curl
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//#include <openssl/applink.c> // To prevent crashing (see the OpenSSL FAQ)
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bool StreamPeerOpenSSL::_match_host_name(const char *name, const char *hostname) {
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return Tool_Curl_cert_hostcheck(name, hostname) == CURL_HOST_MATCH;
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//print_line("MATCH: "+String(name)+" vs "+String(hostname));
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//return true;
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}
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Error StreamPeerOpenSSL::_match_common_name(const char *hostname, const X509 *server_cert) {
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int common_name_loc = -1;
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X509_NAME_ENTRY *common_name_entry = NULL;
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ASN1_STRING *common_name_asn1 = NULL;
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char *common_name_str = NULL;
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// Find the position of the CN field in the Subject field of the certificate
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common_name_loc = X509_NAME_get_index_by_NID(X509_get_subject_name((X509 *)server_cert), NID_commonName, -1);
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ERR_FAIL_COND_V(common_name_loc < 0, ERR_INVALID_PARAMETER);
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// Extract the CN field
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common_name_entry = X509_NAME_get_entry(X509_get_subject_name((X509 *)server_cert), common_name_loc);
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ERR_FAIL_COND_V(common_name_entry == NULL, ERR_INVALID_PARAMETER);
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// Convert the CN field to a C string
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common_name_asn1 = X509_NAME_ENTRY_get_data(common_name_entry);
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ERR_FAIL_COND_V(common_name_asn1 == NULL, ERR_INVALID_PARAMETER);
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common_name_str = (char *)ASN1_STRING_data(common_name_asn1);
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// Make sure there isn't an embedded NUL character in the CN
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bool malformed_certificate = (size_t)ASN1_STRING_length(common_name_asn1) != strlen(common_name_str);
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ERR_FAIL_COND_V(malformed_certificate, ERR_INVALID_PARAMETER);
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// Compare expected hostname with the CN
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return _match_host_name(common_name_str, hostname) ? OK : FAILED;
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}
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/**
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* Tries to find a match for hostname in the certificate's Subject Alternative Name extension.
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*
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*/
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Error StreamPeerOpenSSL::_match_subject_alternative_name(const char *hostname, const X509 *server_cert) {
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Error result = FAILED;
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int i;
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int san_names_nb = -1;
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STACK_OF(GENERAL_NAME) *san_names = NULL;
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// Try to extract the names within the SAN extension from the certificate
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san_names = (STACK_OF(GENERAL_NAME) *)X509_get_ext_d2i((X509 *)server_cert, NID_subject_alt_name, NULL, NULL);
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if (san_names == NULL) {
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return ERR_FILE_NOT_FOUND;
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}
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san_names_nb = sk_GENERAL_NAME_num(san_names);
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// Check each name within the extension
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for (i = 0; i < san_names_nb; i++) {
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const GENERAL_NAME *current_name = sk_GENERAL_NAME_value(san_names, i);
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if (current_name->type == GEN_DNS) {
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// Current name is a DNS name, let's check it
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char *dns_name = (char *)ASN1_STRING_data(current_name->d.dNSName);
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// Make sure there isn't an embedded NUL character in the DNS name
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if ((size_t)ASN1_STRING_length(current_name->d.dNSName) != strlen(dns_name)) {
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result = ERR_INVALID_PARAMETER;
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break;
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} else { // Compare expected hostname with the DNS name
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if (_match_host_name(dns_name, hostname)) {
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result = OK;
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break;
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}
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}
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}
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}
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sk_GENERAL_NAME_pop_free(san_names, GENERAL_NAME_free);
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return result;
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}
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/* See http://archives.seul.org/libevent/users/Jan-2013/msg00039.html */
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int StreamPeerOpenSSL::_cert_verify_callback(X509_STORE_CTX *x509_ctx, void *arg) {
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/* This is the function that OpenSSL would call if we hadn't called
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* SSL_CTX_set_cert_verify_callback(). Therefore, we are "wrapping"
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* the default functionality, rather than replacing it. */
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bool base_cert_valid = X509_verify_cert(x509_ctx);
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if (!base_cert_valid) {
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print_line("Cause: " + String(X509_verify_cert_error_string(X509_STORE_CTX_get_error(x509_ctx))));
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ERR_print_errors_fp(stdout);
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}
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X509 *server_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
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ERR_FAIL_COND_V(!server_cert, 0);
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char cert_str[256];
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X509_NAME_oneline(X509_get_subject_name(server_cert),
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cert_str, sizeof(cert_str));
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print_line("CERT STR: " + String(cert_str));
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print_line("VALID: " + itos(base_cert_valid));
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if (!base_cert_valid)
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return 0;
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StreamPeerOpenSSL *ssl = (StreamPeerOpenSSL *)arg;
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if (ssl->validate_hostname) {
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Error err = _match_subject_alternative_name(ssl->hostname.utf8().get_data(), server_cert);
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if (err == ERR_FILE_NOT_FOUND) {
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err = _match_common_name(ssl->hostname.utf8().get_data(), server_cert);
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}
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if (err != OK) {
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ssl->status = STATUS_ERROR_HOSTNAME_MISMATCH;
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return 0;
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}
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}
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return 1;
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}
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int StreamPeerOpenSSL::_bio_create(BIO *b) {
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b->init = 1;
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b->num = 0;
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b->ptr = NULL;
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b->flags = 0;
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return 1;
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}
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int StreamPeerOpenSSL::_bio_destroy(BIO *b) {
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if (b == NULL)
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return 0;
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b->ptr = NULL; /* sb_tls_remove() will free it */
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b->init = 0;
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b->flags = 0;
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return 1;
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}
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int StreamPeerOpenSSL::_bio_read(BIO *b, char *buf, int len) {
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if (buf == NULL || len <= 0) return 0;
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StreamPeerOpenSSL *sp = (StreamPeerOpenSSL *)b->ptr;
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ERR_FAIL_COND_V(sp == NULL, 0);
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BIO_clear_retry_flags(b);
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if (sp->use_blocking) {
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Error err = sp->base->get_data((uint8_t *)buf, len);
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if (err != OK) {
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return -1;
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}
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return len;
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} else {
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int got;
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Error err = sp->base->get_partial_data((uint8_t *)buf, len, got);
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if (err != OK) {
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return -1;
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}
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if (got == 0) {
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BIO_set_retry_read(b);
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}
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return got;
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}
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//unreachable
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return 0;
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}
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int StreamPeerOpenSSL::_bio_write(BIO *b, const char *buf, int len) {
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if (buf == NULL || len <= 0) return 0;
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StreamPeerOpenSSL *sp = (StreamPeerOpenSSL *)b->ptr;
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ERR_FAIL_COND_V(sp == NULL, 0);
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BIO_clear_retry_flags(b);
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if (sp->use_blocking) {
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Error err = sp->base->put_data((const uint8_t *)buf, len);
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if (err != OK) {
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return -1;
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}
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return len;
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} else {
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int sent;
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Error err = sp->base->put_partial_data((const uint8_t *)buf, len, sent);
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if (err != OK) {
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return -1;
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}
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if (sent == 0) {
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BIO_set_retry_write(b);
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}
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return sent;
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}
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//unreachable
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return 0;
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}
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long StreamPeerOpenSSL::_bio_ctrl(BIO *b, int cmd, long num, void *ptr) {
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if (cmd == BIO_CTRL_FLUSH) {
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/* The OpenSSL library needs this */
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return 1;
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}
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return 0;
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}
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int StreamPeerOpenSSL::_bio_gets(BIO *b, char *buf, int len) {
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return -1;
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}
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int StreamPeerOpenSSL::_bio_puts(BIO *b, const char *str) {
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return _bio_write(b, str, strlen(str));
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}
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BIO_METHOD StreamPeerOpenSSL::_bio_method = {
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/* it's a source/sink BIO */
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(100 | 0x400),
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"streampeer glue",
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_bio_write,
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_bio_read,
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_bio_puts,
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_bio_gets,
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_bio_ctrl,
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_bio_create,
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_bio_destroy
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};
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Error StreamPeerOpenSSL::connect_to_stream(Ref<StreamPeer> p_base, bool p_validate_certs, const String &p_for_hostname) {
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if (connected)
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disconnect_from_stream();
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hostname = p_for_hostname;
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status = STATUS_DISCONNECTED;
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// Set up a SSL_CTX object, which will tell our BIO object how to do its work
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ctx = SSL_CTX_new(SSLv23_client_method());
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base = p_base;
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validate_certs = p_validate_certs;
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validate_hostname = p_for_hostname != "";
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if (p_validate_certs) {
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if (certs.size()) {
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//yay for undocumented OpenSSL functions
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X509_STORE *store = SSL_CTX_get_cert_store(ctx);
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for (int i = 0; i < certs.size(); i++) {
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X509_STORE_add_cert(store, certs[i]);
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}
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#if 0
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const unsigned char *in=(const unsigned char *)certs.ptr();
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X509 *Cert = d2i_X509(NULL, &in, certs.size()-1);
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if (!Cert) {
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print_line(String(ERR_error_string(ERR_get_error(),NULL)));
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}
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ERR_FAIL_COND_V(!Cert,ERR_PARSE_ERROR);
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X509_STORE *store = SSL_CTX_get_cert_store(ctx);
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X509_STORE_add_cert(store,Cert);
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//char *str = X509_NAME_oneline(X509_get_subject_name(Cert),0,0);
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//printf ("subject: %s\n", str); /* [1] */
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#endif
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}
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//used for testing
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//int res = SSL_CTX_load_verify_locations(ctx,"/etc/ssl/certs/ca-certificates.crt",NULL);
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//print_line("verify locations res: "+itos(res));
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/* Ask OpenSSL to verify the server certificate. Note that this
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* does NOT include verifying that the hostname is correct.
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* So, by itself, this means anyone with any legitimate
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* CA-issued certificate for any website, can impersonate any
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* other website in the world. This is not good. See "The
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* Most Dangerous Code in the World" article at
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* https://crypto.stanford.edu/~dabo/pubs/abstracts/ssl-client-bugs.html
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*/
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SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
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/* This is how we solve the problem mentioned in the previous
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* comment. We "wrap" OpenSSL's validation routine in our
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* own routine, which also validates the hostname by calling
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* the code provided by iSECPartners. Note that even though
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* the "Everything You've Always Wanted to Know About
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* Certificate Validation With OpenSSL (But Were Afraid to
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* Ask)" paper from iSECPartners says very explicitly not to
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* call SSL_CTX_set_cert_verify_callback (at the bottom of
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* page 2), what we're doing here is safe because our
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* cert_verify_callback() calls X509_verify_cert(), which is
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* OpenSSL's built-in routine which would have been called if
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* we hadn't set the callback. Therefore, we're just
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* "wrapping" OpenSSL's routine, not replacing it. */
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SSL_CTX_set_cert_verify_callback(ctx, _cert_verify_callback, this);
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//Let the verify_callback catch the verify_depth error so that we get an appropriate error in the logfile. (??)
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SSL_CTX_set_verify_depth(ctx, max_cert_chain_depth + 1);
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}
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ssl = SSL_new(ctx);
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bio = BIO_new(&_bio_method);
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bio->ptr = this;
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SSL_set_bio(ssl, bio, bio);
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if (p_for_hostname != String()) {
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SSL_set_tlsext_host_name(ssl, p_for_hostname.utf8().get_data());
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}
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use_blocking = true; // let handshake use blocking
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// Set the SSL to automatically retry on failure.
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SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
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// Same as before, try to connect.
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int result = SSL_connect(ssl);
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print_line("CONNECTION RESULT: " + itos(result));
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if (result < 1) {
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ERR_print_errors_fp(stdout);
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_print_error(result);
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}
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X509 *peer = SSL_get_peer_certificate(ssl);
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if (peer) {
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bool cert_ok = SSL_get_verify_result(ssl) == X509_V_OK;
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print_line("cert_ok: " + itos(cert_ok));
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} else if (validate_certs) {
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status = STATUS_ERROR_NO_CERTIFICATE;
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}
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connected = true;
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status = STATUS_CONNECTED;
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return OK;
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}
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Error StreamPeerOpenSSL::accept_stream(Ref<StreamPeer> p_base) {
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return ERR_UNAVAILABLE;
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}
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void StreamPeerOpenSSL::_print_error(int err) {
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err = SSL_get_error(ssl, err);
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switch (err) {
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case SSL_ERROR_NONE: ERR_PRINT("NO ERROR: The TLS/SSL I/O operation completed"); break;
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case SSL_ERROR_ZERO_RETURN: ERR_PRINT("The TLS/SSL connection has been closed.");
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case SSL_ERROR_WANT_READ:
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case SSL_ERROR_WANT_WRITE:
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ERR_PRINT("The operation did not complete.");
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break;
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case SSL_ERROR_WANT_CONNECT:
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case SSL_ERROR_WANT_ACCEPT:
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ERR_PRINT("The connect/accept operation did not complete");
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break;
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case SSL_ERROR_WANT_X509_LOOKUP:
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ERR_PRINT("The operation did not complete because an application callback set by SSL_CTX_set_client_cert_cb() has asked to be called again.");
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break;
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case SSL_ERROR_SYSCALL:
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ERR_PRINT("Some I/O error occurred. The OpenSSL error queue may contain more information on the error.");
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break;
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case SSL_ERROR_SSL:
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ERR_PRINT("A failure in the SSL library occurred, usually a protocol error.");
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break;
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}
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}
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Error StreamPeerOpenSSL::put_data(const uint8_t *p_data, int p_bytes) {
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ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED);
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while (p_bytes > 0) {
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int ret = SSL_write(ssl, p_data, p_bytes);
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if (ret <= 0) {
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_print_error(ret);
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disconnect_from_stream();
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return ERR_CONNECTION_ERROR;
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}
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p_data += ret;
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p_bytes -= ret;
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}
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return OK;
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}
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Error StreamPeerOpenSSL::put_partial_data(const uint8_t *p_data, int p_bytes, int &r_sent) {
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ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED);
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if (p_bytes == 0)
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return OK;
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Error err = put_data(p_data, p_bytes);
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if (err != OK)
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return err;
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r_sent = p_bytes;
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return OK;
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}
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Error StreamPeerOpenSSL::get_data(uint8_t *p_buffer, int p_bytes) {
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ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED);
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while (p_bytes > 0) {
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int ret = SSL_read(ssl, p_buffer, p_bytes);
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if (ret <= 0) {
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_print_error(ret);
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disconnect_from_stream();
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return ERR_CONNECTION_ERROR;
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}
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p_buffer += ret;
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p_bytes -= ret;
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}
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return OK;
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}
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Error StreamPeerOpenSSL::get_partial_data(uint8_t *p_buffer, int p_bytes, int &r_received) {
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ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED);
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if (p_bytes == 0) {
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r_received = 0;
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return OK;
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}
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Error err = get_data(p_buffer, p_bytes);
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if (err != OK)
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return err;
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r_received = p_bytes;
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return OK;
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}
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int StreamPeerOpenSSL::get_available_bytes() const {
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ERR_FAIL_COND_V(!connected, 0);
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return SSL_pending(ssl);
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}
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StreamPeerOpenSSL::StreamPeerOpenSSL() {
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ctx = NULL;
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ssl = NULL;
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bio = NULL;
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connected = false;
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use_blocking = true; //might be improved int the future, but for now it always blocks
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max_cert_chain_depth = 9;
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flags = 0;
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}
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void StreamPeerOpenSSL::disconnect_from_stream() {
|
|
|
|
if (!connected)
|
|
return;
|
|
SSL_shutdown(ssl);
|
|
SSL_free(ssl);
|
|
SSL_CTX_free(ctx);
|
|
base = Ref<StreamPeer>();
|
|
connected = false;
|
|
validate_certs = false;
|
|
validate_hostname = false;
|
|
status = STATUS_DISCONNECTED;
|
|
}
|
|
|
|
StreamPeerOpenSSL::Status StreamPeerOpenSSL::get_status() const {
|
|
|
|
return status;
|
|
}
|
|
|
|
StreamPeerOpenSSL::~StreamPeerOpenSSL() {
|
|
disconnect_from_stream();
|
|
}
|
|
|
|
StreamPeerSSL *StreamPeerOpenSSL::_create_func() {
|
|
|
|
return memnew(StreamPeerOpenSSL);
|
|
}
|
|
|
|
Vector<X509 *> StreamPeerOpenSSL::certs;
|
|
|
|
void StreamPeerOpenSSL::_load_certs(const PoolByteArray &p_array) {
|
|
|
|
PoolByteArray::Read r = p_array.read();
|
|
BIO *mem = BIO_new(BIO_s_mem());
|
|
BIO_puts(mem, (const char *)r.ptr());
|
|
while (true) {
|
|
X509 *cert = PEM_read_bio_X509(mem, NULL, 0, NULL);
|
|
if (!cert)
|
|
break;
|
|
certs.push_back(cert);
|
|
}
|
|
BIO_free(mem);
|
|
}
|
|
|
|
void StreamPeerOpenSSL::initialize_ssl() {
|
|
|
|
available = true;
|
|
|
|
load_certs_func = _load_certs;
|
|
|
|
_create = _create_func;
|
|
CRYPTO_malloc_init(); // Initialize malloc, free, etc for OpenSSL's use
|
|
SSL_library_init(); // Initialize OpenSSL's SSL libraries
|
|
SSL_load_error_strings(); // Load SSL error strings
|
|
ERR_load_BIO_strings(); // Load BIO error strings
|
|
OpenSSL_add_all_algorithms(); // Load all available encryption algorithms
|
|
String certs_path = GLOBAL_DEF("network/ssl/certificates", "");
|
|
ProjectSettings::get_singleton()->set_custom_property_info("network/ssl/certificates", PropertyInfo(Variant::STRING, "network/ssl/certificates", PROPERTY_HINT_FILE, "*.crt"));
|
|
if (certs_path != "") {
|
|
|
|
FileAccess *f = FileAccess::open(certs_path, FileAccess::READ);
|
|
if (f) {
|
|
PoolByteArray arr;
|
|
int flen = f->get_len();
|
|
arr.resize(flen + 1);
|
|
{
|
|
PoolByteArray::Write w = arr.write();
|
|
f->get_buffer(w.ptr(), flen);
|
|
w[flen] = 0; //end f string
|
|
}
|
|
|
|
memdelete(f);
|
|
|
|
_load_certs(arr);
|
|
print_line("Loaded certs from '" + certs_path + "': " + itos(certs.size()));
|
|
}
|
|
}
|
|
String config_path = GLOBAL_DEF("network/ssl/config", "");
|
|
ProjectSettings::get_singleton()->set_custom_property_info("network/ssl/config", PropertyInfo(Variant::STRING, "network/ssl/config", PROPERTY_HINT_FILE, "*.cnf"));
|
|
if (config_path != "") {
|
|
|
|
Vector<uint8_t> data = FileAccess::get_file_as_array(config_path);
|
|
if (data.size()) {
|
|
data.push_back(0);
|
|
BIO *mem = BIO_new(BIO_s_mem());
|
|
BIO_puts(mem, (const char *)data.ptr());
|
|
|
|
while (true) {
|
|
X509 *cert = PEM_read_bio_X509(mem, NULL, 0, NULL);
|
|
if (!cert)
|
|
break;
|
|
certs.push_back(cert);
|
|
}
|
|
BIO_free(mem);
|
|
}
|
|
print_line("Loaded certs from '" + certs_path + "': " + itos(certs.size()));
|
|
}
|
|
}
|
|
|
|
void StreamPeerOpenSSL::finalize_ssl() {
|
|
|
|
for (int i = 0; i < certs.size(); i++) {
|
|
X509_free(certs[i]);
|
|
}
|
|
certs.clear();
|
|
}
|