d8223ffa75
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer
with state-of-the-art rendering techniques tuned to work as low as middle
end handheld devices - without compromising with the possibilities given
for higher end desktop games of course. Great times ahead for the Godot
community and the gamers that will play our games!
(cherry picked from commit c7bc44d5ad)
646 lines
17 KiB
C++
646 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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/* */
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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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}
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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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{
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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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{
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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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{
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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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{
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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(Ref<StreamPeer> p_base, bool p_validate_certs, const String& p_for_hostname) {
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if (connected)
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disconnect();
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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(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."); 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"); 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."); 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."); 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."); 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();
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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();
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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);
|
|
|
|
return SSL_pending(ssl);
|
|
|
|
}
|
|
StreamPeerOpenSSL::StreamPeerOpenSSL() {
|
|
|
|
ctx=NULL;
|
|
ssl=NULL;
|
|
bio=NULL;
|
|
connected=false;
|
|
use_blocking=true; //might be improved int the future, but for now it always blocks
|
|
max_cert_chain_depth=9;
|
|
flags=0;
|
|
}
|
|
|
|
void StreamPeerOpenSSL::disconnect() {
|
|
|
|
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();
|
|
}
|
|
|
|
StreamPeerSSL* StreamPeerOpenSSL::_create_func() {
|
|
|
|
return memnew( StreamPeerOpenSSL );
|
|
}
|
|
|
|
|
|
Vector<X509*> StreamPeerOpenSSL::certs;
|
|
|
|
|
|
void StreamPeerOpenSSL::_load_certs(const ByteArray& p_array) {
|
|
|
|
ByteArray::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("ssl/certificates","");
|
|
Globals::get_singleton()->set_custom_property_info("ssl/certificates",PropertyInfo(Variant::STRING,"ssl/certificates",PROPERTY_HINT_FILE,"*.crt"));
|
|
if (certs_path!="") {
|
|
|
|
|
|
|
|
FileAccess *f=FileAccess::open(certs_path,FileAccess::READ);
|
|
if (f) {
|
|
ByteArray arr;
|
|
int flen = f->get_len();
|
|
arr.resize(flen+1);
|
|
{
|
|
ByteArray::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("ssl/config","");
|
|
Globals::get_singleton()->set_custom_property_info("ssl/config",PropertyInfo(Variant::STRING,"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();
|
|
}
|