106 lines
3.2 KiB
Python
106 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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#
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# test_dtls_handshake_once.py
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#
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# Copyright (C) 2006-2020 wolfSSL Inc.
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#
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# This file is part of wolfSSL. (formerly known as CyaSSL)
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#
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# wolfSSL is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# wolfSSL is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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# pylint: disable=missing-docstring, invalid-name, import-error
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# pylint: disable=protected-access
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"""
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F-4136: for DTLS, write()/read()/recv_into() used to call do_handshake() on
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every single call. Once the handshake has completed, re-running it is wasteful
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and, on a non-blocking socket, wolfSSL_accept/connect can raise
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SSLWantReadError and abort an otherwise valid I/O. The handshake must only be
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driven until it completes.
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"""
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from types import SimpleNamespace
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import pytest
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import wolfssl
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class _OkLib:
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"""_lib stub whose I/O calls always succeed."""
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def wolfSSL_write(self, ssl, data, length):
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return length
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def wolfSSL_read(self, ssl, data, length):
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return length
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def wolfSSL_get_error(self, ssl, ret): # pragma: no cover
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return 0
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def _make_dtls_socket(handshake_complete):
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sock = wolfssl.SSLSocket.__new__(wolfssl.SSLSocket)
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sock.native_object = object()
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sock._connected = True
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sock._server_side = True
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sock._context = SimpleNamespace(protocol=wolfssl.PROTOCOL_DTLSv1_2)
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sock._handshake_complete = handshake_complete
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sock._release_native_object = lambda: None
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return sock
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@pytest.fixture
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def spy_handshake(monkeypatch):
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monkeypatch.setattr(wolfssl, "_lib", _OkLib())
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calls = []
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def _record(sock):
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calls.append(True)
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sock._handshake_complete = True
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return calls, _record
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@pytest.mark.parametrize("op", ["write", "read", "recv_into"])
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def test_dtls_io_does_not_redrive_completed_handshake(spy_handshake, op):
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calls, record = spy_handshake
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sock = _make_dtls_socket(handshake_complete=True)
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sock.do_handshake = lambda block=False: record(sock)
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if op == "write":
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sock.write(b"payload")
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elif op == "read":
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sock.read(8)
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else:
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sock.recv_into(bytearray(8))
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assert calls == [], "do_handshake() must not run once the handshake is done"
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@pytest.mark.parametrize("op", ["write", "read", "recv_into"])
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def test_dtls_io_drives_handshake_until_complete(spy_handshake, op):
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calls, record = spy_handshake
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sock = _make_dtls_socket(handshake_complete=False)
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sock.do_handshake = lambda block=False: record(sock)
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if op == "write":
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sock.write(b"payload")
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elif op == "read":
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sock.read(8)
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else:
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sock.recv_into(bytearray(8))
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assert calls == [True], "first DTLS I/O must drive the handshake once"
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