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//usr/share/doc/m2crypto-0.16/demo/medusa054/ftps_server.py
"""An FTP/TLS server built on Medusa's ftp_server. Copyright (c) 1999-2004 Ng Pheng Siong. All rights reserved.""" # Python import socket, string, sys, time # Medusa from counter import counter import asynchat, asyncore, ftp_server, logger # M2Crypto from M2Crypto import SSL, version VERSION_STRING=version class ftp_tls_channel(ftp_server.ftp_channel): """FTP/TLS server channel for Medusa.""" def __init__(self, server, ssl_ctx, conn, addr): """Initialise the channel.""" self.ssl_ctx = ssl_ctx self.server = server self.current_mode = 'a' self.addr = addr asynchat.async_chat.__init__(self, conn) self.set_terminator('\r\n') self.client_addr = (addr[0], 21) self.client_dc = None self.in_buffer = '' self.closing = 0 self.passive_acceptor = None self.passive_connection = None self.filesystem = None self.authorized = 0 self._ssl_accepting = 0 self._ssl_accepted = 0 self._pbsz = None self._prot = None resp = '220 %s M2Crypto (Medusa) FTP/TLS server v%s ready.' self.respond(resp % (self.server.hostname, VERSION_STRING)) def writable(self): return self._ssl_accepting or self._ssl_accepted def handle_read(self): """Handle a read event.""" if self._ssl_accepting: self._ssl_accepted = self.socket.accept_ssl() if self._ssl_accepted: self._ssl_accepting = 0 else: try: ftp_server.ftp_channel.handle_read(self) except SSL.SSLError, what: if str(what) == 'unexpected eof': self.close() else: raise def handle_write(self): """Handle a write event.""" if self._ssl_accepting: self._ssl_accepted = self.socket.accept_ssl() if self._ssl_accepted: self._ssl_accepting = 0 else: try: ftp_server.ftp_channel.handle_write(self) except SSL.SSLError, what: if str(what) == 'unexpected eof': self.close() else: raise def send(self, data): """Send data over SSL.""" try: result = self.socket.send(data) if result <= 0: return 0 else: return result except SSL.SSLError, what: self.close() self.log_info('send: closing channel %s %s' % (repr(self), what)) return 0 def recv(self, buffer_size): """Receive data over SSL.""" try: result = self.socket.recv(buffer_size) if not result: return '' else: return result except SSL.SSLError, what: self.close() self.log_info('recv: closing channel %s %s' % (repr(self), what)) return '' def found_terminator(self): """Dispatch the FTP command.""" line = self.in_buffer if not len(line): return sp = string.find(line, ' ') if sp != -1: line = [line[:sp], line[sp+1:]] else: line = [line] command = string.lower(line[0]) if string.find(command, 'stor') != -1: while command and command[0] not in string.letters: command = command[1:] func_name = 'cmd_%s' % command if command != 'pass': self.log('<== %s' % repr(self.in_buffer)[1:-1]) else: self.log('<== %s' % line[0]+' <password>') self.in_buffer = '' if not hasattr(self, func_name): self.command_not_understood(line[0]) return func = getattr(self, func_name) if not self.check_command_authorization(command): self.command_not_authorized(command) else: try: result = apply(func, (line,)) except: self.server.total_exceptions.increment() (file, func, line), t, v, tbinfo = asyncore.compact_traceback() if self.client_dc: try: self.client_dc_close() except: pass resp = '451 Server error: %s, %s: file %s line: %s' self.respond(resp % (t, v, file, line)) def make_xmit_channel(self): """Create a connection for sending data.""" pa = self.passive_acceptor if pa: if pa.ready: conn, addr = pa.ready if self._prot: cdc = tls_xmit_channel(self, conn, self.ssl_ctx, addr) else: cdc = ftp_server.xmit_channel(self, addr) cdc.set_socket(conn) cdc.connected = 1 self.passive_acceptor.close() self.passive_acceptor = None else: if self._prot: cdc = tls_xmit_channel(self, None, self.ssl_ctx, None) else: cdc = ftp_server.xmit_channel(self) else: if self._prot: cdc = tls_xmit_channel(self, None, self.ssl_ctx, self.client_addr) else: cdc = ftp_server.xmit_channel(self, self.client_addr) cdc.create_socket(socket.AF_INET, socket.SOCK_STREAM) if self.bind_local_minus_one: cdc.bind(('', self.server.port - 1)) try: cdc.connect(self.client_addr) except socket.error, what: self.respond('425 Cannot build data connection') self.client_dc = cdc def make_recv_channel(self, fd): """Create a connection for receiving data.""" pa = self.passive_acceptor if pa: if pa.ready: conn, addr = pa.ready if self._prot: cdc = tls_recv_channel(self, conn, self.ssl_ctx, addr, fd) else: cdc = ftp_server.recv_channel(self, addr, fd) cdc.set_socket(conn) cdc.connected = 1 self.passive_acceptor.close() self.passive_acceptor = None else: if self._prot: cdc = tls_recv_channel(self, None, self.ssl_ctx, None, fd) else: cdc = ftp_server.recv_channel(self, None, fd) else: if self._prot: cdc = tls_recv_channel(self, None, self.ssl_ctx, self._prot, self.client_addr, fd) else: cdc = ftp_server.recv_channel(self, self.client_addr, fd) cdc.create_socket(socket.AF_INET, socket.SOCK_STREAM) try: cdc.connect(self.client_addr) except socket.error, what: self.respond('425 Cannot build data connection') self.client_dc = cdc def cmd_auth(self, line): """Prepare for TLS operation.""" # XXX Handle variations. if line[1] != 'TLS': self.command_not_understood (string.join(line)) else: self.respond('234 AUTH TLS successful') self._ssl_accepting = 1 self.socket = SSL.Connection(self.ssl_ctx, self.socket) self.socket.setup_addr(self.addr) self.socket.setup_ssl() self.socket.set_accept_state() self._ssl_accepted = self.socket.accept_ssl() if self._ssl_accepted: self._ssl_accepting = 0 def cmd_pbsz(self, line): """Negotiate size of buffer for secure data transfer. For FTP/TLS the only valid value for the parameter is '0'; any other value is accepted but ignored.""" if not (self._ssl_accepting or self._ssl_accepted): return self.respond('503 AUTH TLS must be issued prior to PBSZ') self._pbsz = 1 self.respond('200 PBSZ=0 successful.') def cmd_prot(self, line): """Negotiate the security level of the data connection.""" if self._pbsz is None: return self.respond('503 PBSZ must be issued prior to PROT') if line[1] == 'C': self.respond('200 Protection set to Clear') self._pbsz = None self._prot = None elif line[1] == 'P': self.respond('200 Protection set to Private') self._prot = 1 elif line[1] in ('S', 'E'): self.respond('536 PROT %s unsupported' % line[1]) else: self.respond('504 PROT %s unsupported' % line[1]) class ftp_tls_server(ftp_server.ftp_server): """FTP/TLS server for Medusa.""" SERVER_IDENT = 'M2Crypto FTP/TLS Server (v%s)' % VERSION_STRING ftp_channel_class = ftp_tls_channel def __init__(self, authz, ssl_ctx, host=None, ip='', port=21, resolver=None, log_obj=None): """Initialise the server.""" self.ssl_ctx = ssl_ctx self.ip = ip self.port = port self.authorizer = authz if host is None: self.hostname = socket.gethostname() else: self.hostname = host self.total_sessions = counter() self.closed_sessions = counter() self.total_files_out = counter() self.total_files_in = counter() self.total_bytes_out = counter() self.total_bytes_in = counter() self.total_exceptions = counter() asyncore.dispatcher.__init__(self) self.create_socket(socket.AF_INET, socket.SOCK_STREAM) self.set_reuse_addr() self.bind((self.ip, self.port)) self.listen(5) if log_obj is None: log_obj = sys.stdout if resolver: self.logger = logger.resolving_logger(resolver, log_obj) else: self.logger = logger.unresolving_logger(logger.file_logger(sys.stdout)) l = 'M2Crypto (Medusa) FTP/TLS server started at %s\n\tAuthz: %s\n\tHostname: %s\n\tPort: %d' self.log_info(l % (time.ctime(time.time()), repr(self.authorizer), self.hostname, self.port)) def handle_accept(self): """Accept a socket and dispatch a channel to handle it.""" conn, addr = self.accept() self.total_sessions.increment() self.log_info('Connection from %s:%d' % addr) self.ftp_channel_class(self, self.ssl_ctx, conn, addr) class nbio_ftp_tls_actor: """TLS protocol negotiation mixin for FTP/TLS.""" def tls_init(self, sock, ssl_ctx, client_addr): """Perform TLS protocol negotiation.""" self.ssl_ctx = ssl_ctx self.client_addr = client_addr self._ssl_handshaking = 1 self._ssl_handshake_ok = 0 if sock: self.socket = SSL.Connection(self.ssl_ctx, sock) self.socket.setup_addr(self.client_addr) self.socket.setup_ssl() self._ssl_handshake_ok = self.socket.accept_ssl() if self._ssl_handshake_ok: self._ssl_handshaking = 0 self.add_channel() # else the client hasn't connected yet; when that happens, # handle_connect() will be triggered. def tls_neg_ok(self): """Return status of TLS protocol negotiation.""" if self._ssl_handshaking: self._ssl_handshake_ok = self.socket.accept_ssl() if self._ssl_handshake_ok: self._ssl_handshaking = 0 return self._ssl_handshake_ok def handle_connect(self): """Handle a data connection that occurs after this instance came into being. When this handler is triggered, self.socket has been created and refers to the underlying connected socket.""" self.socket = SSL.Connection(self.ssl_ctx, self.socket) self.socket.setup_addr(self.client_addr) self.socket.setup_ssl() self._ssl_handshake_ok = self.socket.accept_ssl() if self._ssl_handshake_ok: self._ssl_handshaking = 0 self.add_channel() def send(self, data): """Send data over SSL.""" try: result = self.socket.send(data) if result <= 0: return 0 else: return result except SSL.SSLError, what: self.close() self.log_info('send: closing channel %s %s' % (repr(self), what)) return 0 def recv(self, buffer_size): """Receive data over SSL.""" try: result = self.socket.recv(buffer_size) if not result: return '' else: return result except SSL.SSLError, what: self.close() self.log_info('recv: closing channel %s %s' % (repr(self), what)) return '' class tls_xmit_channel(nbio_ftp_tls_actor, ftp_server.xmit_channel): """TLS driver for a send-only data connection.""" def __init__(self, channel, conn, ssl_ctx, client_addr=None): """Initialise the driver.""" ftp_server.xmit_channel.__init__(self, channel, client_addr) self.tls_init(conn, ssl_ctx, client_addr) def readable(self): """This channel is readable iff TLS negotiation is in progress. (Which implies a connected channel, of course.)""" if not self.connected: return 0 else: return self._ssl_handshaking def writable(self): """This channel is writable iff TLS negotiation is in progress or the application has data to send.""" if self._ssl_handshaking: return 1 else: return ftp_server.xmit_channel.writable(self) def handle_read(self): """Handle a read event: either continue with TLS negotiation or let the application handle this event.""" if self.tls_neg_ok(): ftp_server.xmit_channel.handle_read(self) def handle_write(self): """Handle a write event: either continue with TLS negotiation or let the application handle this event.""" if self.tls_neg_ok(): ftp_server.xmit_channel.handle_write(self) class tls_recv_channel(nbio_ftp_tls_actor, ftp_server.recv_channel): """TLS driver for a receive-only data connection.""" def __init__(self, channel, conn, ssl_ctx, client_addr, fd): """Initialise the driver.""" ftp_server.recv_channel.__init__(self, channel, client_addr, fd) self.tls_init(conn, ssl_ctx, client_addr) def writable(self): """This channel is writable iff TLS negotiation is in progress.""" return self._ssl_handshaking def handle_read(self): """Handle a read event: either continue with TLS negotiation or let the application handle this event.""" if self.tls_neg_ok(): ftp_server.recv_channel.handle_read(self) def handle_write(self): """Handle a write event: either continue with TLS negotiation or let the application handle this event.""" if self.tls_neg_ok(): ftp_server.recv_channel.handle_write(self)