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