mirror of
https://github.com/jtesta/ssh-audit.git
synced 2024-11-16 13:35:39 +01:00
109 lines
3.9 KiB
Python
109 lines
3.9 KiB
Python
"""
|
|
The MIT License (MIT)
|
|
|
|
Copyright (C) 2017 Andris Raugulis (moo@arthepsy.eu)
|
|
|
|
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.
|
|
"""
|
|
import io
|
|
import struct
|
|
|
|
# pylint: disable=unused-import
|
|
from typing import Dict, List, Set, Sequence, Tuple, Iterable # noqa: F401
|
|
from typing import Callable, Optional, Union, Any # noqa: F401
|
|
|
|
|
|
class WriteBuf:
|
|
def __init__(self, data: Optional[bytes] = None) -> None:
|
|
super(WriteBuf, self).__init__()
|
|
self._wbuf = io.BytesIO(data) if data is not None else io.BytesIO()
|
|
|
|
def write(self, data: bytes) -> 'WriteBuf':
|
|
self._wbuf.write(data)
|
|
return self
|
|
|
|
def write_byte(self, v: int) -> 'WriteBuf':
|
|
return self.write(struct.pack('B', v))
|
|
|
|
def write_bool(self, v: bool) -> 'WriteBuf':
|
|
return self.write_byte(1 if v else 0)
|
|
|
|
def write_int(self, v: int) -> 'WriteBuf':
|
|
return self.write(struct.pack('>I', v))
|
|
|
|
def write_string(self, v: Union[bytes, str]) -> 'WriteBuf':
|
|
if not isinstance(v, bytes):
|
|
v = bytes(bytearray(v, 'utf-8'))
|
|
self.write_int(len(v))
|
|
return self.write(v)
|
|
|
|
def write_list(self, v: List[str]) -> 'WriteBuf':
|
|
return self.write_string(u','.join(v))
|
|
|
|
@classmethod
|
|
def _bitlength(cls, n: int) -> int:
|
|
try:
|
|
return n.bit_length()
|
|
except AttributeError:
|
|
return len(bin(n)) - (2 if n > 0 else 3)
|
|
|
|
@classmethod
|
|
def _create_mpint(cls, n: int, signed: bool = True, bits: Optional[int] = None) -> bytes:
|
|
if bits is None:
|
|
bits = cls._bitlength(n)
|
|
length = bits // 8 + (1 if n != 0 else 0)
|
|
ql = (length + 7) // 8
|
|
fmt, v2 = '>{}Q'.format(ql), [0] * ql
|
|
for i in range(ql):
|
|
v2[ql - i - 1] = n & 0xffffffffffffffff
|
|
n >>= 64
|
|
data = bytes(struct.pack(fmt, *v2)[-length:])
|
|
if not signed:
|
|
data = data.lstrip(b'\x00')
|
|
elif data.startswith(b'\xff\x80'):
|
|
data = data[1:]
|
|
return data
|
|
|
|
def write_mpint1(self, n: int) -> 'WriteBuf':
|
|
# NOTE: Data Type Enc @ http://www.snailbook.com/docs/protocol-1.5.txt
|
|
bits = self._bitlength(n)
|
|
data = self._create_mpint(n, False, bits)
|
|
self.write(struct.pack('>H', bits))
|
|
return self.write(data)
|
|
|
|
def write_mpint2(self, n: int) -> 'WriteBuf':
|
|
# NOTE: Section 5 @ https://www.ietf.org/rfc/rfc4251.txt
|
|
data = self._create_mpint(n)
|
|
return self.write_string(data)
|
|
|
|
def write_line(self, v: Union[bytes, str]) -> 'WriteBuf':
|
|
if not isinstance(v, bytes):
|
|
v = bytes(bytearray(v, 'utf-8'))
|
|
v += b'\r\n'
|
|
return self.write(v)
|
|
|
|
def write_flush(self) -> bytes:
|
|
payload = self._wbuf.getvalue()
|
|
self._wbuf.truncate(0)
|
|
self._wbuf.seek(0)
|
|
return payload
|
|
|
|
def reset(self) -> None:
|
|
self._wbuf = io.BytesIO()
|