a7f49ac9a1
Happy new year to the wonderful Godot community! We're starting a new decade with a well-established, non-profit, free and open source game engine, and tons of further improvements in the pipeline from hundreds of contributors. Godot will keep getting better, and we're looking forward to all the games that the community will keep developing and releasing with it.
334 lines
8.4 KiB
C++
334 lines
8.4 KiB
C++
/*************************************************************************/
|
|
/* file_access_encrypted.cpp */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2020 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 "file_access_encrypted.h"
|
|
|
|
#include "core/crypto/crypto_core.h"
|
|
#include "core/os/copymem.h"
|
|
#include "core/print_string.h"
|
|
#include "core/variant.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
#define COMP_MAGIC 0x43454447
|
|
|
|
Error FileAccessEncrypted::open_and_parse(FileAccess *p_base, const Vector<uint8_t> &p_key, Mode p_mode) {
|
|
|
|
ERR_FAIL_COND_V_MSG(file != NULL, ERR_ALREADY_IN_USE, "Can't open file while another file from path '" + file->get_path_absolute() + "' is open.");
|
|
ERR_FAIL_COND_V(p_key.size() != 32, ERR_INVALID_PARAMETER);
|
|
|
|
pos = 0;
|
|
eofed = false;
|
|
|
|
if (p_mode == MODE_WRITE_AES256) {
|
|
|
|
data.clear();
|
|
writing = true;
|
|
file = p_base;
|
|
mode = p_mode;
|
|
key = p_key;
|
|
|
|
} else if (p_mode == MODE_READ) {
|
|
|
|
writing = false;
|
|
key = p_key;
|
|
uint32_t magic = p_base->get_32();
|
|
ERR_FAIL_COND_V(magic != COMP_MAGIC, ERR_FILE_UNRECOGNIZED);
|
|
|
|
mode = Mode(p_base->get_32());
|
|
ERR_FAIL_INDEX_V(mode, MODE_MAX, ERR_FILE_CORRUPT);
|
|
ERR_FAIL_COND_V(mode == 0, ERR_FILE_CORRUPT);
|
|
|
|
unsigned char md5d[16];
|
|
p_base->get_buffer(md5d, 16);
|
|
length = p_base->get_64();
|
|
base = p_base->get_position();
|
|
ERR_FAIL_COND_V(p_base->get_len() < base + length, ERR_FILE_CORRUPT);
|
|
uint32_t ds = length;
|
|
if (ds % 16) {
|
|
ds += 16 - (ds % 16);
|
|
}
|
|
|
|
data.resize(ds);
|
|
|
|
uint32_t blen = p_base->get_buffer(data.ptrw(), ds);
|
|
ERR_FAIL_COND_V(blen != ds, ERR_FILE_CORRUPT);
|
|
|
|
CryptoCore::AESContext ctx;
|
|
ctx.set_decode_key(key.ptrw(), 256);
|
|
|
|
for (size_t i = 0; i < ds; i += 16) {
|
|
|
|
ctx.decrypt_ecb(&data.write[i], &data.write[i]);
|
|
}
|
|
|
|
data.resize(length);
|
|
|
|
unsigned char hash[16];
|
|
ERR_FAIL_COND_V(CryptoCore::md5(data.ptr(), data.size(), hash) != OK, ERR_BUG);
|
|
|
|
ERR_FAIL_COND_V_MSG(String::md5(hash) != String::md5(md5d), ERR_FILE_CORRUPT, "The MD5 sum of the decrypted file does not match the expected value. It could be that the file is corrupt, or that the provided decryption key is invalid.");
|
|
|
|
file = p_base;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
Error FileAccessEncrypted::open_and_parse_password(FileAccess *p_base, const String &p_key, Mode p_mode) {
|
|
|
|
String cs = p_key.md5_text();
|
|
ERR_FAIL_COND_V(cs.length() != 32, ERR_INVALID_PARAMETER);
|
|
Vector<uint8_t> key;
|
|
key.resize(32);
|
|
for (int i = 0; i < 32; i++) {
|
|
|
|
key.write[i] = cs[i];
|
|
}
|
|
|
|
return open_and_parse(p_base, key, p_mode);
|
|
}
|
|
|
|
Error FileAccessEncrypted::_open(const String &p_path, int p_mode_flags) {
|
|
|
|
return OK;
|
|
}
|
|
void FileAccessEncrypted::close() {
|
|
|
|
if (!file)
|
|
return;
|
|
|
|
if (writing) {
|
|
|
|
Vector<uint8_t> compressed;
|
|
size_t len = data.size();
|
|
if (len % 16) {
|
|
len += 16 - (len % 16);
|
|
}
|
|
|
|
unsigned char hash[16];
|
|
ERR_FAIL_COND(CryptoCore::md5(data.ptr(), data.size(), hash) != OK); // Bug?
|
|
|
|
compressed.resize(len);
|
|
zeromem(compressed.ptrw(), len);
|
|
for (int i = 0; i < data.size(); i++) {
|
|
compressed.write[i] = data[i];
|
|
}
|
|
|
|
CryptoCore::AESContext ctx;
|
|
ctx.set_encode_key(key.ptrw(), 256);
|
|
|
|
for (size_t i = 0; i < len; i += 16) {
|
|
|
|
ctx.encrypt_ecb(&compressed.write[i], &compressed.write[i]);
|
|
}
|
|
|
|
file->store_32(COMP_MAGIC);
|
|
file->store_32(mode);
|
|
|
|
file->store_buffer(hash, 16);
|
|
file->store_64(data.size());
|
|
|
|
file->store_buffer(compressed.ptr(), compressed.size());
|
|
file->close();
|
|
memdelete(file);
|
|
file = NULL;
|
|
data.clear();
|
|
|
|
} else {
|
|
|
|
file->close();
|
|
memdelete(file);
|
|
data.clear();
|
|
file = NULL;
|
|
}
|
|
}
|
|
|
|
bool FileAccessEncrypted::is_open() const {
|
|
|
|
return file != NULL;
|
|
}
|
|
|
|
String FileAccessEncrypted::get_path() const {
|
|
|
|
if (file)
|
|
return file->get_path();
|
|
else
|
|
return "";
|
|
}
|
|
|
|
String FileAccessEncrypted::get_path_absolute() const {
|
|
|
|
if (file)
|
|
return file->get_path_absolute();
|
|
else
|
|
return "";
|
|
}
|
|
|
|
void FileAccessEncrypted::seek(size_t p_position) {
|
|
|
|
if (p_position > (size_t)data.size())
|
|
p_position = data.size();
|
|
|
|
pos = p_position;
|
|
eofed = false;
|
|
}
|
|
|
|
void FileAccessEncrypted::seek_end(int64_t p_position) {
|
|
|
|
seek(data.size() + p_position);
|
|
}
|
|
size_t FileAccessEncrypted::get_position() const {
|
|
|
|
return pos;
|
|
}
|
|
size_t FileAccessEncrypted::get_len() const {
|
|
|
|
return data.size();
|
|
}
|
|
|
|
bool FileAccessEncrypted::eof_reached() const {
|
|
|
|
return eofed;
|
|
}
|
|
|
|
uint8_t FileAccessEncrypted::get_8() const {
|
|
|
|
ERR_FAIL_COND_V_MSG(writing, 0, "File has not been opened in read mode.");
|
|
if (pos >= data.size()) {
|
|
eofed = true;
|
|
return 0;
|
|
}
|
|
|
|
uint8_t b = data[pos];
|
|
pos++;
|
|
return b;
|
|
}
|
|
int FileAccessEncrypted::get_buffer(uint8_t *p_dst, int p_length) const {
|
|
|
|
ERR_FAIL_COND_V_MSG(writing, 0, "File has not been opened in read mode.");
|
|
|
|
int to_copy = MIN(p_length, data.size() - pos);
|
|
for (int i = 0; i < to_copy; i++) {
|
|
|
|
p_dst[i] = data[pos++];
|
|
}
|
|
|
|
if (to_copy < p_length) {
|
|
eofed = true;
|
|
}
|
|
|
|
return to_copy;
|
|
}
|
|
|
|
Error FileAccessEncrypted::get_error() const {
|
|
|
|
return eofed ? ERR_FILE_EOF : OK;
|
|
}
|
|
|
|
void FileAccessEncrypted::store_buffer(const uint8_t *p_src, int p_length) {
|
|
|
|
ERR_FAIL_COND_MSG(!writing, "File has not been opened in read mode.");
|
|
|
|
if (pos < data.size()) {
|
|
|
|
for (int i = 0; i < p_length; i++) {
|
|
|
|
store_8(p_src[i]);
|
|
}
|
|
} else if (pos == data.size()) {
|
|
|
|
data.resize(pos + p_length);
|
|
for (int i = 0; i < p_length; i++) {
|
|
|
|
data.write[pos + i] = p_src[i];
|
|
}
|
|
pos += p_length;
|
|
}
|
|
}
|
|
|
|
void FileAccessEncrypted::flush() {
|
|
ERR_FAIL_COND_MSG(!writing, "File has not been opened in read mode.");
|
|
|
|
// encrypted files keep data in memory till close()
|
|
}
|
|
|
|
void FileAccessEncrypted::store_8(uint8_t p_dest) {
|
|
|
|
ERR_FAIL_COND_MSG(!writing, "File has not been opened in read mode.");
|
|
|
|
if (pos < data.size()) {
|
|
data.write[pos] = p_dest;
|
|
pos++;
|
|
} else if (pos == data.size()) {
|
|
data.push_back(p_dest);
|
|
pos++;
|
|
}
|
|
}
|
|
|
|
bool FileAccessEncrypted::file_exists(const String &p_name) {
|
|
|
|
FileAccess *fa = FileAccess::open(p_name, FileAccess::READ);
|
|
if (!fa)
|
|
return false;
|
|
memdelete(fa);
|
|
return true;
|
|
}
|
|
|
|
uint64_t FileAccessEncrypted::_get_modified_time(const String &p_file) {
|
|
|
|
return 0;
|
|
}
|
|
|
|
uint32_t FileAccessEncrypted::_get_unix_permissions(const String &p_file) {
|
|
|
|
return 0;
|
|
}
|
|
|
|
Error FileAccessEncrypted::_set_unix_permissions(const String &p_file, uint32_t p_permissions) {
|
|
ERR_PRINT("Setting UNIX permissions on encrypted files is not implemented yet.");
|
|
return ERR_UNAVAILABLE;
|
|
}
|
|
|
|
FileAccessEncrypted::FileAccessEncrypted() {
|
|
|
|
file = NULL;
|
|
pos = 0;
|
|
eofed = false;
|
|
mode = MODE_MAX;
|
|
writing = false;
|
|
}
|
|
|
|
FileAccessEncrypted::~FileAccessEncrypted() {
|
|
|
|
if (file)
|
|
close();
|
|
}
|