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280 lines
8.8 KiB
280 lines
8.8 KiB
5 months ago
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from __future__ import annotations
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import io
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import socket
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import ssl
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import typing
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from ..exceptions import ProxySchemeUnsupported
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if typing.TYPE_CHECKING:
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from typing_extensions import Self
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from .ssl_ import _TYPE_PEER_CERT_RET, _TYPE_PEER_CERT_RET_DICT
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_WriteBuffer = typing.Union[bytearray, memoryview]
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_ReturnValue = typing.TypeVar("_ReturnValue")
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SSL_BLOCKSIZE = 16384
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class SSLTransport:
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"""
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The SSLTransport wraps an existing socket and establishes an SSL connection.
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Contrary to Python's implementation of SSLSocket, it allows you to chain
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multiple TLS connections together. It's particularly useful if you need to
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implement TLS within TLS.
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The class supports most of the socket API operations.
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"""
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@staticmethod
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def _validate_ssl_context_for_tls_in_tls(ssl_context: ssl.SSLContext) -> None:
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"""
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Raises a ProxySchemeUnsupported if the provided ssl_context can't be used
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for TLS in TLS.
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The only requirement is that the ssl_context provides the 'wrap_bio'
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methods.
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"""
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if not hasattr(ssl_context, "wrap_bio"):
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raise ProxySchemeUnsupported(
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"TLS in TLS requires SSLContext.wrap_bio() which isn't "
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"available on non-native SSLContext"
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)
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def __init__(
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self,
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socket: socket.socket,
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ssl_context: ssl.SSLContext,
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server_hostname: str | None = None,
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suppress_ragged_eofs: bool = True,
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) -> None:
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"""
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Create an SSLTransport around socket using the provided ssl_context.
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"""
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self.incoming = ssl.MemoryBIO()
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self.outgoing = ssl.MemoryBIO()
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self.suppress_ragged_eofs = suppress_ragged_eofs
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self.socket = socket
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self.sslobj = ssl_context.wrap_bio(
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self.incoming, self.outgoing, server_hostname=server_hostname
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)
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# Perform initial handshake.
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self._ssl_io_loop(self.sslobj.do_handshake)
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def __enter__(self) -> Self:
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return self
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def __exit__(self, *_: typing.Any) -> None:
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self.close()
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def fileno(self) -> int:
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return self.socket.fileno()
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def read(self, len: int = 1024, buffer: typing.Any | None = None) -> int | bytes:
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return self._wrap_ssl_read(len, buffer)
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def recv(self, buflen: int = 1024, flags: int = 0) -> int | bytes:
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if flags != 0:
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raise ValueError("non-zero flags not allowed in calls to recv")
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return self._wrap_ssl_read(buflen)
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def recv_into(
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self,
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buffer: _WriteBuffer,
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nbytes: int | None = None,
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flags: int = 0,
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) -> None | int | bytes:
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if flags != 0:
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raise ValueError("non-zero flags not allowed in calls to recv_into")
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if nbytes is None:
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nbytes = len(buffer)
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return self.read(nbytes, buffer)
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def sendall(self, data: bytes, flags: int = 0) -> None:
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if flags != 0:
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raise ValueError("non-zero flags not allowed in calls to sendall")
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count = 0
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with memoryview(data) as view, view.cast("B") as byte_view:
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amount = len(byte_view)
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while count < amount:
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v = self.send(byte_view[count:])
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count += v
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def send(self, data: bytes, flags: int = 0) -> int:
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if flags != 0:
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raise ValueError("non-zero flags not allowed in calls to send")
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return self._ssl_io_loop(self.sslobj.write, data)
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def makefile(
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self,
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mode: str,
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buffering: int | None = None,
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*,
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encoding: str | None = None,
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errors: str | None = None,
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newline: str | None = None,
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) -> typing.BinaryIO | typing.TextIO | socket.SocketIO:
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"""
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Python's httpclient uses makefile and buffered io when reading HTTP
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messages and we need to support it.
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This is unfortunately a copy and paste of socket.py makefile with small
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changes to point to the socket directly.
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"""
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if not set(mode) <= {"r", "w", "b"}:
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raise ValueError(f"invalid mode {mode!r} (only r, w, b allowed)")
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writing = "w" in mode
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reading = "r" in mode or not writing
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assert reading or writing
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binary = "b" in mode
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rawmode = ""
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if reading:
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rawmode += "r"
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if writing:
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rawmode += "w"
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raw = socket.SocketIO(self, rawmode) # type: ignore[arg-type]
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self.socket._io_refs += 1 # type: ignore[attr-defined]
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if buffering is None:
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buffering = -1
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if buffering < 0:
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buffering = io.DEFAULT_BUFFER_SIZE
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if buffering == 0:
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if not binary:
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raise ValueError("unbuffered streams must be binary")
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return raw
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buffer: typing.BinaryIO
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if reading and writing:
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buffer = io.BufferedRWPair(raw, raw, buffering) # type: ignore[assignment]
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elif reading:
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buffer = io.BufferedReader(raw, buffering)
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else:
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assert writing
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buffer = io.BufferedWriter(raw, buffering)
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if binary:
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return buffer
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text = io.TextIOWrapper(buffer, encoding, errors, newline)
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text.mode = mode # type: ignore[misc]
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return text
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def unwrap(self) -> None:
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self._ssl_io_loop(self.sslobj.unwrap)
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def close(self) -> None:
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self.socket.close()
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@typing.overload
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def getpeercert(
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self, binary_form: typing.Literal[False] = ...
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) -> _TYPE_PEER_CERT_RET_DICT | None:
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...
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@typing.overload
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def getpeercert(self, binary_form: typing.Literal[True]) -> bytes | None:
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...
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def getpeercert(self, binary_form: bool = False) -> _TYPE_PEER_CERT_RET:
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return self.sslobj.getpeercert(binary_form) # type: ignore[return-value]
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def version(self) -> str | None:
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return self.sslobj.version()
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def cipher(self) -> tuple[str, str, int] | None:
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return self.sslobj.cipher()
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def selected_alpn_protocol(self) -> str | None:
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return self.sslobj.selected_alpn_protocol()
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def selected_npn_protocol(self) -> str | None:
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return self.sslobj.selected_npn_protocol()
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def shared_ciphers(self) -> list[tuple[str, str, int]] | None:
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return self.sslobj.shared_ciphers()
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def compression(self) -> str | None:
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return self.sslobj.compression()
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def settimeout(self, value: float | None) -> None:
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self.socket.settimeout(value)
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def gettimeout(self) -> float | None:
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return self.socket.gettimeout()
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def _decref_socketios(self) -> None:
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self.socket._decref_socketios() # type: ignore[attr-defined]
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def _wrap_ssl_read(self, len: int, buffer: bytearray | None = None) -> int | bytes:
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try:
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return self._ssl_io_loop(self.sslobj.read, len, buffer)
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except ssl.SSLError as e:
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if e.errno == ssl.SSL_ERROR_EOF and self.suppress_ragged_eofs:
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return 0 # eof, return 0.
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else:
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raise
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# func is sslobj.do_handshake or sslobj.unwrap
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@typing.overload
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def _ssl_io_loop(self, func: typing.Callable[[], None]) -> None:
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...
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# func is sslobj.write, arg1 is data
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@typing.overload
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def _ssl_io_loop(self, func: typing.Callable[[bytes], int], arg1: bytes) -> int:
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...
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# func is sslobj.read, arg1 is len, arg2 is buffer
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@typing.overload
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def _ssl_io_loop(
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self,
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func: typing.Callable[[int, bytearray | None], bytes],
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arg1: int,
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arg2: bytearray | None,
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) -> bytes:
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...
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def _ssl_io_loop(
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self,
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func: typing.Callable[..., _ReturnValue],
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arg1: None | bytes | int = None,
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arg2: bytearray | None = None,
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) -> _ReturnValue:
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"""Performs an I/O loop between incoming/outgoing and the socket."""
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should_loop = True
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ret = None
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while should_loop:
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errno = None
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try:
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if arg1 is None and arg2 is None:
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ret = func()
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elif arg2 is None:
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ret = func(arg1)
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else:
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ret = func(arg1, arg2)
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except ssl.SSLError as e:
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if e.errno not in (ssl.SSL_ERROR_WANT_READ, ssl.SSL_ERROR_WANT_WRITE):
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# WANT_READ, and WANT_WRITE are expected, others are not.
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raise e
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errno = e.errno
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buf = self.outgoing.read()
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self.socket.sendall(buf)
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if errno is None:
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should_loop = False
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elif errno == ssl.SSL_ERROR_WANT_READ:
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buf = self.socket.recv(SSL_BLOCKSIZE)
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if buf:
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self.incoming.write(buf)
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else:
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self.incoming.write_eof()
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return typing.cast(_ReturnValue, ret)
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