polardbxengine/plugin/keyring/common/keyring_key.cc

246 lines
8.3 KiB
C++

/* Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "plugin/keyring/common/keyring_key.h"
#include <stddef.h>
#include "my_dbug.h"
namespace keyring {
Key::Key() : key(nullptr), key_len(0) {}
Key::Key(const char *a_key_id, const char *a_key_type, const char *a_user_id,
const void *a_key, size_t a_key_len) {
init(a_key_id, a_key_type, a_user_id, a_key, a_key_len);
}
Key::Key(const Key &other) {
init(other.key_id.c_str(), other.key_type.c_str(), other.user_id.c_str(),
other.key.get(), other.key_len);
}
Key::Key(IKey *other) {
init(other->get_key_id()->c_str(), other->get_key_type()->c_str(),
other->get_user_id()->c_str(), other->get_key_data(),
other->get_key_data_size());
}
void Key::init(const char *a_key_id, const char *a_key_type,
const char *a_user_id, const void *a_key, size_t a_key_len) {
if (a_key_id != NULL) key_id = a_key_id;
if (a_key_type != NULL) key_type = a_key_type;
if (a_user_id != NULL) user_id = a_user_id;
key_len = a_key_len;
if (a_key != NULL && key_len > 0) {
key.reset(new uchar[a_key_len]);
memcpy(key.get(), a_key, a_key_len);
}
}
Key::~Key() {
if (key) memset(key.get(), 0, key_len);
}
void Key::store_field_length(uchar *buffer, size_t *buffer_position,
size_t length) const {
*reinterpret_cast<size_t *>(buffer + *buffer_position) = length;
*buffer_position += sizeof(length);
}
void Key::store_field(uchar *buffer, size_t *buffer_position, const char *field,
size_t field_length) const {
if (field_length > 0) memcpy(buffer + *buffer_position, field, field_length);
*buffer_position += field_length;
}
void Key::store_in_buffer(uchar *buffer, size_t *buffer_position) const {
store_field_length(buffer, buffer_position, get_key_pod_size());
store_field_length(buffer, buffer_position, key_id.length());
store_field_length(buffer, buffer_position, key_type.length());
store_field_length(buffer, buffer_position, user_id.length());
store_field_length(buffer, buffer_position, key_len);
store_field(buffer, buffer_position, key_id.c_str(), key_id.length());
store_field(buffer, buffer_position, key_type.c_str(), key_type.length());
store_field(buffer, buffer_position, user_id.c_str(), user_id.length());
store_field(buffer, buffer_position, reinterpret_cast<char *>(key.get()),
key_len);
size_t padding =
(sizeof(size_t) - (*buffer_position % sizeof(size_t))) % sizeof(size_t);
*buffer_position += padding;
DBUG_ASSERT(*buffer_position % sizeof(size_t) == 0);
}
bool Key::load_string_from_buffer(const uchar *buffer, size_t *buffer_position,
size_t key_pod_size, std::string *string,
size_t string_length) {
if (key_pod_size < *buffer_position + string_length) return true;
string->assign(reinterpret_cast<const char *>(buffer) + *buffer_position,
string_length);
*buffer_position += string_length;
return false;
}
bool Key::load_field_size(const uchar *buffer, size_t *buffer_position,
size_t key_pod_size, size_t *field_length) {
if (key_pod_size < *buffer_position + sizeof(size_t)) return true;
*field_length = *reinterpret_cast<const size_t *>(buffer + *buffer_position);
*buffer_position += sizeof(size_t);
return false;
}
bool Key::load_from_buffer(uchar *buffer,
size_t *number_of_bytes_read_from_buffer,
size_t input_buffer_size) {
size_t key_pod_size;
size_t key_id_length;
size_t key_type_length;
size_t user_id_length;
size_t buffer_position = 0;
if (input_buffer_size < buffer_position + sizeof(size_t)) return true;
key_pod_size = *reinterpret_cast<size_t *>(buffer + buffer_position);
if (input_buffer_size < buffer_position + key_pod_size) return true;
buffer_position += sizeof(size_t);
if (load_field_size(buffer, &buffer_position, key_pod_size, &key_id_length) ||
load_field_size(buffer, &buffer_position, key_pod_size,
&key_type_length) ||
load_field_size(buffer, &buffer_position, key_pod_size,
&user_id_length) ||
load_field_size(buffer, &buffer_position, key_pod_size, &key_len))
return true;
if (load_string_from_buffer(buffer, &buffer_position, key_pod_size, &key_id,
key_id_length) ||
load_string_from_buffer(buffer, &buffer_position, key_pod_size, &key_type,
key_type_length) ||
load_string_from_buffer(buffer, &buffer_position, key_pod_size, &user_id,
user_id_length))
return true;
key.reset(new uchar[key_len]);
memcpy(this->key.get(), buffer + buffer_position, key_len);
buffer_position += key_len;
size_t padding =
(sizeof(size_t) - (buffer_position % sizeof(size_t))) % sizeof(size_t);
buffer_position += padding;
DBUG_ASSERT(buffer_position % sizeof(size_t) == 0);
*number_of_bytes_read_from_buffer = buffer_position;
return false;
}
/*!
Calculates memory needed for key to be stored in POD format (serialized)
The memory is aligned to sizeof(size_t)
*/
size_t Key::get_key_pod_size() const {
size_t key_pod_size = 4 * sizeof(size_t) + key_id.length() +
key_type.length() + user_id.length() + sizeof(key_len) +
key_len;
size_t padding =
(sizeof(size_t) - (key_pod_size % sizeof(size_t))) % sizeof(size_t);
size_t key_pod_size_aligned = key_pod_size + padding;
DBUG_ASSERT(key_pod_size_aligned % sizeof(size_t) == 0);
return key_pod_size_aligned;
}
void Key::xor_data() {
if (key == NULL) return;
static const char *obfuscate_str = "*305=Ljt0*!@$Hnm(*-9-w;:";
for (uint i = 0, l = 0; i < key_len;
++i, l = ((l + 1) % strlen(obfuscate_str)))
key.get()[i] ^= obfuscate_str[l];
}
bool Key::is_key_id_valid() { return key_id.length() > 0; }
bool Key::is_key_type_valid() {
return key_type.length() &&
(key_type == "AES" || key_type == "RSA" || key_type == "DSA");
}
bool Key::is_key_valid() { return is_key_id_valid() || is_key_type_valid(); }
bool Key::is_key_length_valid() {
if (key_type == "AES") return key_len == 16 || key_len == 24 || key_len == 32;
if (key_type == "RSA")
return key_len == 128 || key_len == 256 || key_len == 512;
if (key_type == "DSA")
return key_len == 128 || key_len == 256 || key_len == 384;
return false;
}
uchar *Key::release_key_data() { return key.release(); }
uchar *Key::get_key_data() { return key.get(); }
size_t Key::get_key_data_size() { return key_len; }
void Key::set_key_data(uchar *key_data, size_t key_data_size) {
key.reset(key_data);
key_len = key_data_size;
}
void Key::set_key_type(const std::string *key_type) {
this->key_type = *key_type;
}
// Key signature is ended with '\0'
void Key::create_key_signature() const {
if (key_id.empty()) return;
key_signature.append(key_id);
key_signature.append(user_id);
}
std::string *Key::get_key_signature() const {
if (key_signature.empty() == true) create_key_signature();
return &key_signature;
}
std::string *Key::get_key_type() { return &this->key_type; }
std::string *Key::get_key_id() { return &this->key_id; }
std::string *Key::get_user_id() { return &this->user_id; }
} // namespace keyring