__ssl = __import__('ssl') for var in (var for var in dir(__ssl) if not var.startswith('__')): exec "%s = __ssl.%s" % (var, var) del var time = __import__('time') from eventlib.api import trampoline from eventlib.greenio import set_nonblocking, GreenSocket, CONNECT_ERR, CONNECT_SUCCESS, BLOCKING_ERR orig_socket = __import__('socket') socket = orig_socket.socket __patched__ = ['SSLSocket', 'wrap_socket', 'sslwrap_simple'] class GreenSSLSocket(__ssl.SSLSocket): """ This is a green version of the SSLSocket class from the ssl module added in 2.6. For documentation on it, please see the Python standard documentation. Python nonblocking ssl objects don't give errors when the other end of the socket is closed (they do notice when the other end is shutdown, though). Any write/read operations will simply hang if the socket is closed from the other end. There is no obvious fix for this problem; it appears to be a limitation of Python's ssl object implementation. A workaround is to set a reasonable timeout on the socket using settimeout(), and to close/reopen the connection when a timeout occurs at an unexpected juncture in the code. """ # we are inheriting from SSLSocket because its constructor calls # do_handshake whose behavior we wish to override def __init__(self, sock, *args, **kw): if not isinstance(sock, GreenSocket): sock = GreenSocket(sock) self.act_non_blocking = sock.act_non_blocking self._timeout = sock.gettimeout() super(GreenSSLSocket, self).__init__(sock.fd, *args, **kw) # the superclass initializer trashes the methods so we remove # the local-object versions of them and let the actual class # methods shine through try: for fn in orig_socket._delegate_methods: delattr(self, fn) except AttributeError: pass def settimeout(self, timeout): self._timeout = timeout def gettimeout(self): return self._timeout def setblocking(self, flag): if flag: self.act_non_blocking = False self._timeout = None else: self.act_non_blocking = True self._timeout = 0.0 def _call_trampolining(self, func, *a, **kw): if self.act_non_blocking: return func(*a, **kw) else: while True: try: return func(*a, **kw) except SSLError, e: if e.args[0] == SSL_ERROR_WANT_READ: trampoline(self, read=True, timeout=self.gettimeout(), timeout_exc=SSLError('timed out')) elif e.args[0] == SSL_ERROR_WANT_WRITE: trampoline(self, write=True, timeout=self.gettimeout(), timeout_exc=SSLError('timed out')) else: raise def write(self, data): """Write DATA to the underlying SSL channel. Returns number of bytes of DATA actually transmitted.""" return self._call_trampolining( super(GreenSSLSocket, self).write, data) def read(self, len=1024): """Read up to LEN bytes and return them. Return zero-length string on EOF.""" return self._call_trampolining( super(GreenSSLSocket, self).read, len) def send (self, data, flags=0): if self._sslobj: return self._call_trampolining( super(GreenSSLSocket, self).send, data, flags) else: trampoline(self, write=True, timeout_exc=SSLError('timed out')) return socket.send(self, data, flags) def sendto (self, data, addr, flags=0): # *NOTE: gross, copied code from ssl.py becase it's not factored well enough to be used as-is if self._sslobj: raise ValueError("sendto not allowed on instances of %s" % self.__class__) else: trampoline(self, write=True, timeout_exc=SSLError('timed out')) return socket.sendto(self, data, addr, flags) def sendall (self, data, flags=0): # *NOTE: gross, copied code from ssl.py becase it's not factored well enough to be used as-is if self._sslobj: if flags != 0: raise ValueError( "non-zero flags not allowed in calls to sendall() on %s" % self.__class__) amount = len(data) count = 0 while (count < amount): v = self.send(data[count:]) count += v return amount else: trampoline(self, write=True, timeout_exc=SSLError('timed out')) return socket.sendall(self, data, flags) def recv(self, buflen=1024, flags=0): # *NOTE: gross, copied code from ssl.py becase it's not factored well enough to be used as-is if self._sslobj: if flags != 0: raise ValueError( "non-zero flags not allowed in calls to recv() on %s" % self.__class__) read = self.read(buflen) return read else: return socket.recv(self, buflen, flags) def recv_into (self, buffer, nbytes=None, flags=0): if not self.act_non_blocking: trampoline(self, read=True, timeout=self.gettimeout(), timeout_exc=SSLError('timed out')) return super(GreenSSLSocket, self).recv_into(buffer, nbytes, flags) def recvfrom (self, addr, buflen=1024, flags=0): if not self.act_non_blocking: trampoline(self, read=True, timeout=self.gettimeout(), timeout_exc=SSLError('timed out')) return super(GreenSSLSocket, self).recvfrom(addr, buflen, flags) def recvfrom_into (self, buffer, nbytes=None, flags=0): if not self.act_non_blocking: trampoline(self, read=True, timeout=self.gettimeout(), timeout_exc=SSLError('timed out')) return super(GreenSSLSocket, self).recvfrom_into(buffer, nbytes, flags) def unwrap(self): return GreenSocket(super(GreenSSLSocket, self).unwrap()) def do_handshake(self): """Perform a TLS/SSL handshake.""" return self._call_trampolining( super(GreenSSLSocket, self).do_handshake) def _socket_connect(self, addr): real_connect = socket.connect if self.act_non_blocking: return real_connect(self, addr) else: # *NOTE: gross, copied code from greenio because it's not factored # well enough to reuse if self.gettimeout() is None: while True: try: return real_connect(self, addr) except orig_socket.error, e: if e.args[0] in CONNECT_ERR: trampoline(self, write=True) elif e.args[0] in CONNECT_SUCCESS: return else: raise else: end = time.time() + self.gettimeout() while True: try: real_connect(self, addr) except orig_socket.error, e: if e.args[0] in CONNECT_ERR: trampoline(self, write=True, timeout=end-time.time(), timeout_exc=SSLError('timed out')) elif e.args[0] in CONNECT_SUCCESS: return else: raise if time.time() >= end: raise SSLError('timed out') def connect(self, addr): """Connects to remote ADDR, and then wraps the connection in an SSL channel.""" # *NOTE: grrrrr copied this code from ssl.py because of the reference # to socket.connect which we don't want to call directly if self._sslobj: raise ValueError("attempt to connect already-connected SSLSocket!") self._socket_connect(addr) self._sslobj = _ssl.sslwrap(self._sock, False, self.keyfile, self.certfile, self.cert_reqs, self.ssl_version, self.ca_certs, self.ciphers) if self.do_handshake_on_connect: self.do_handshake() def accept(self): """Accepts a new connection from a remote client, and returns a tuple containing that new connection wrapped with a server-side SSL channel, and the address of the remote client.""" # RDW grr duplication of code from greenio if self.act_non_blocking: newsock, addr = socket.accept(self) else: while True: try: newsock, addr = socket.accept(self) set_nonblocking(newsock) break except orig_socket.error, e: if e.args[0] not in BLOCKING_ERR: raise trampoline(self, read=True, timeout=self.gettimeout(), timeout_exc=SSLError('timed out')) new_ssl = type(self)(newsock, keyfile=self.keyfile, certfile=self.certfile, server_side=True, cert_reqs=self.cert_reqs, ssl_version=self.ssl_version, ca_certs=self.ca_certs, do_handshake_on_connect=self.do_handshake_on_connect, suppress_ragged_eofs=self.suppress_ragged_eofs) return (new_ssl, addr) def dup(self): raise NotImplementedError("Can't dup an ssl object") SSLSocket = GreenSSLSocket def wrap_socket(sock, *a, **kw): return GreenSSLSocket(sock, *a, **kw) if hasattr(__ssl, 'sslwrap_simple'): def sslwrap_simple(sock, keyfile=None, certfile=None): """A replacement for the old socket.ssl function. Designed for compability with Python 2.5 and earlier. Will disappear in Python 3.0.""" ssl_sock = GreenSSLSocket(sock, keyfile=keyfile, certfile=certfile, server_side=False, cert_reqs=CERT_NONE, ssl_version=PROTOCOL_SSLv23, ca_certs=None) return ssl_sock