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# Copyright (c) 2016, 2024, Oracle and/or its affiliates.
#
# 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 designed to work 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 either included with
# the program or referenced in the documentation.
#
# Without limiting anything contained in the foregoing, this file,
# which is part of MySQL Connector/Python, is also subject to the
# Universal FOSS Exception, version 1.0, a copy of which can be found at
# http://oss.oracle.com/licenses/universal-foss-exception.
#
# 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
"""Implementation of MySQL Authentication Plugin."""
import hashlib
import struct
from typing import Optional
from .helpers import hexlify
def xor_string(hash1: bytes, hash2: bytes, hash_size: int) -> bytes:
"""Encrypt/Decrypt function used for password encryption in
authentication, using a simple XOR.
Args:
hash1 (str): The first hash.
hash2 (str): The second hash.
Returns:
str: A string with the xor applied.
"""
xored = [h1 ^ h2 for (h1, h2) in zip(hash1, hash2)]
return struct.pack(f"{hash_size}B", *xored)
class BaseAuthPlugin:
"""Base class for implementing the authentication plugins."""
def __init__(self, username: Optional[str] = None, password: Optional[str] = None):
self._username: Optional[str] = username
self._password: Optional[str] = password
def name(self) -> str:
"""Returns the plugin name.
Returns:
str: The plugin name.
"""
raise NotImplementedError
def auth_name(self) -> str:
"""Returns the authentication name.
Returns:
str: The authentication name.
"""
raise NotImplementedError
class MySQL41AuthPlugin(BaseAuthPlugin):
"""Class implementing the MySQL Native Password authentication plugin."""
def name(self) -> str:
"""Returns the plugin name.
Returns:
str: The plugin name.
"""
return "MySQL 4.1 Authentication Plugin"
def auth_name(self) -> str:
"""Returns the authentication name.
Returns:
str: The authentication name.
"""
return "MYSQL41"
def auth_data(self, data: bytes) -> str:
"""Hashing for MySQL 4.1 authentication.
Args:
data (bytes): The authentication data.
Returns:
str: The authentication response.
"""
if self._password:
password = (
self._password.encode("utf-8")
if isinstance(self._password, str)
else self._password
)
hash1 = hashlib.sha1(password).digest()
hash2 = hashlib.sha1(hash1).digest()
xored = xor_string(hash1, hashlib.sha1(data + hash2).digest(), 20)
return f"\0{self._username}\0*{hexlify(xored)}\0"
return f"\0{self._username}\0"
class PlainAuthPlugin(BaseAuthPlugin):
"""Class implementing the MySQL Plain authentication plugin."""
def name(self) -> str:
"""Returns the plugin name.
Returns:
str: The plugin name.
"""
return "Plain Authentication Plugin"
def auth_name(self) -> str:
"""Returns the authentication name.
Returns:
str: The authentication name.
"""
return "PLAIN"
def auth_data(self) -> str:
"""Returns the authentication data.
Returns:
str: The authentication data.
"""
return f"\0{self._username}\0{self._password}"
class Sha256MemoryAuthPlugin(BaseAuthPlugin):
"""Class implementing the SHA256_MEMORY authentication plugin."""
def name(self) -> str:
"""Returns the plugin name.
Returns:
str: The plugin name.
"""
return "SHA256_MEMORY Authentication Plugin"
def auth_name(self) -> str:
"""Returns the authentication name.
Returns:
str: The authentication name.
"""
return "SHA256_MEMORY"
def auth_data(self, data: bytes) -> str:
"""Hashing for SHA256_MEMORY authentication.
The scramble is of the form:
SHA256(SHA256(SHA256(PASSWORD)),NONCE) XOR SHA256(PASSWORD)
Args:
data (bytes): The authentication data.
Returns:
str: The authentication response.
"""
password = (
self._password.encode("utf-8")
if isinstance(self._password, str)
else self._password
)
hash1 = hashlib.sha256(password).digest()
hash2 = hashlib.sha256(hashlib.sha256(hash1).digest() + data).digest()
xored = xor_string(hash2, hash1, 32)
return f"\0{self._username}\0{hexlify(xored)}"
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