def test_remote_server_key(sftpserver): '''test .remote_server_key property''' with sftpserver.serve_content(VFS): this_conn = conn(sftpserver) this_conn['cnopts'].hostkeys = None # turn-off hostkey verification with pysftp.Connection(**this_conn) as sftp: rsk = sftp.remote_server_key hks = HostKeys() hks.add(hostname=sftpserver.host, keytype=rsk.get_name(), key=rsk) hks.save('sftpserver.pub')
def _connect_transport(self, transport, username=None, password=None): if not username: username = self.username if not password: password = self.password try: transport.start_client() except paramiko.SSHException: raise ConnectionError("SSH negotiation failed") hostkeys = HostKeys() hostkey_file = os.path.expanduser('~/.ssh/known_hosts') hostkeys.load(hostkey_file) server_hostkey_name = ("[%s]:%d" % (self.hostname, self.port) if self.port != 22 else self.hostname) server_hostkey_type = transport.host_key.get_name() try: # Raises KeyError if no host key is present expected_key = hostkeys[server_hostkey_name][server_hostkey_type] if expected_key != transport.host_key: if self.hostkey_change_cb(): raise KeyError else: raise SSHException( "SSH host key changed to %s" % binascii.hexlify(transport.host_key.get_fingerprint())) except KeyError: hostkeys.add(server_hostkey_name, server_hostkey_type, transport.host_key) hostkeys.save(hostkey_file) try: transport.auth_password(username, password) # double check, auth_password should already raise the exception if not transport.is_authenticated(): raise paramiko.AuthenticationException() except paramiko.AuthenticationException: raise LoginFailedException("SSH login failed for user %s" % username)
def do_ssh_paramiko_connect_to(transport, host, username, password, host_config=None, keyfiles=None, paramiko_config=None): from paramiko import SSHException, PasswordRequiredException from paramiko.agent import Agent from paramiko.hostkeys import HostKeys log("do_ssh_paramiko_connect_to%s", (transport, host, username, password, host_config, keyfiles, paramiko_config)) log("SSH transport %s", transport) def configvalue(key): #if the paramiko config has a setting, honour it: if paramiko_config and key in paramiko_config: return paramiko_config.get(key) #fallback to the value from the host config: return (host_config or {}).get(key) def configbool(key, default_value=True): return parse_bool(key, configvalue(key), default_value) def configint(key, default_value=0): v = configvalue(key) if v is None: return default_value return int(v) host_key = transport.get_remote_server_key() assert host_key, "no remote server key" log("remote_server_key=%s", keymd5(host_key)) if configbool("verify-hostkey", VERIFY_HOSTKEY): host_keys = HostKeys() host_keys_filename = None KNOWN_HOSTS = get_ssh_known_hosts_files() for known_hosts in KNOWN_HOSTS: host_keys.clear() try: path = os.path.expanduser(known_hosts) if os.path.exists(path): host_keys.load(path) log("HostKeys.load(%s) successful", path) host_keys_filename = path break except IOError: log("HostKeys.load(%s)", known_hosts, exc_info=True) log("host keys=%s", host_keys) keys = host_keys.lookup(host) known_host_key = (keys or {}).get(host_key.get_name()) def keyname(): return host_key.get_name().replace("ssh-", "") if host_key==known_host_key: assert host_key log("%s host key '%s' OK for host '%s'", keyname(), keymd5(host_key), host) else: dnscheck = "" if configbool("verifyhostkeydns"): try: from xpra.net.sshfp import check_host_key dnscheck = check_host_key(host, host_key) except ImportError as e: log("verifyhostkeydns failed", exc_info=True) log.warn("Warning: cannot check SSHFP DNS records") log.warn(" %s", e) log("dnscheck=%s", dnscheck) def adddnscheckinfo(q): if dnscheck is not True: if dnscheck: q += [ "SSHFP validation failed:", dnscheck ] else: q += [ "SSHFP validation failed" ] if dnscheck is True: #DNSSEC provided a matching record log.info("found a valid SSHFP record for host %s", host) elif known_host_key: log.warn("Warning: SSH server key mismatch") qinfo = [ "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!", "IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!", "Someone could be eavesdropping on you right now (man-in-the-middle attack)!", "It is also possible that a host key has just been changed.", "The fingerprint for the %s key sent by the remote host is" % keyname(), keymd5(host_key), ] adddnscheckinfo(qinfo) if configbool("stricthostkeychecking", VERIFY_STRICT): log.warn("Host key verification failed.") #TODO: show alert with no option to accept key qinfo += [ "Please contact your system administrator.", "Add correct host key in %s to get rid of this message.", "Offending %s key in %s" % (keyname(), host_keys_filename), "ECDSA host key for %s has changed and you have requested strict checking." % keyname(), ] sys.stderr.write(os.linesep.join(qinfo)) transport.close() raise InitExit(EXIT_SSH_KEY_FAILURE, "SSH Host key has changed") if not confirm_key(qinfo): transport.close() raise InitExit(EXIT_SSH_KEY_FAILURE, "SSH Host key has changed") else: assert (not keys) or (host_key.get_name() not in keys) if not keys: log.warn("Warning: unknown SSH host") else: log.warn("Warning: unknown %s SSH host key", keyname()) qinfo = [ "The authenticity of host '%s' can't be established." % (host,), "%s key fingerprint is" % keyname(), keymd5(host_key), ] adddnscheckinfo(qinfo) if not confirm_key(qinfo): transport.close() raise InitExit(EXIT_SSH_KEY_FAILURE, "Unknown SSH host '%s'" % host) if configbool("addkey", ADD_KEY): try: if not host_keys_filename: #the first one is the default, #ie: ~/.ssh/known_hosts on posix host_keys_filename = os.path.expanduser(KNOWN_HOSTS[0]) log("adding %s key for host '%s' to '%s'", keyname(), host, host_keys_filename) if not os.path.exists(host_keys_filename): keys_dir = os.path.dirname(host_keys_filename) if not os.path.exists(keys_dir): log("creating keys directory '%s'", keys_dir) os.mkdir(keys_dir, 0o700) elif not os.path.isdir(keys_dir): log.warn("Warning: '%s' is not a directory") log.warn(" key not saved") if os.path.exists(keys_dir) and os.path.isdir(keys_dir): log("creating known host file '%s'", host_keys_filename) with umask_context(0o133): with open(host_keys_filename, 'a+'): pass host_keys.add(host, host_key.get_name(), host_key) host_keys.save(host_keys_filename) except OSError as e: log("failed to add key to '%s'", host_keys_filename) log.error("Error adding key to '%s'", host_keys_filename) log.error(" %s", e) except Exception as e: log.error("cannot add key", exc_info=True) else: log("ssh host key verification skipped") def auth_agent(): agent = Agent() agent_keys = agent.get_keys() log("agent keys: %s", agent_keys) if agent_keys: for agent_key in agent_keys: log("trying ssh-agent key '%s'", keymd5(agent_key)) try: transport.auth_publickey(username, agent_key) if transport.is_authenticated(): log("authenticated using agent and key '%s'", keymd5(agent_key)) break except SSHException: log("agent key '%s' rejected", keymd5(agent_key), exc_info=True) if not transport.is_authenticated(): log.info("agent authentication failed, tried %i key%s", len(agent_keys), engs(agent_keys)) def auth_publickey(): log("trying public key authentication using %s", keyfiles) for keyfile_path in keyfiles: if not os.path.exists(keyfile_path): log("no keyfile at '%s'", keyfile_path) continue log("trying '%s'", keyfile_path) key = None import paramiko for pkey_classname in ("RSA", "DSS", "ECDSA", "Ed25519"): pkey_class = getattr(paramiko, "%sKey" % pkey_classname, None) if pkey_class is None: log("no %s key type", pkey_classname) continue log("trying to load as %s", pkey_classname) try: key = pkey_class.from_private_key_file(keyfile_path) log.info("loaded %s private key from '%s'", pkey_classname, keyfile_path) break except PasswordRequiredException as e: log("%s keyfile requires a passphrase; %s", keyfile_path, e) passphrase = input_pass("please enter the passphrase for %s:" % (keyfile_path,)) if passphrase: try: key = pkey_class.from_private_key_file(keyfile_path, passphrase) log.info("loaded %s private key from '%s'", pkey_classname, keyfile_path) except SSHException as e: log("from_private_key_file", exc_info=True) log.info("cannot load key from file '%s':", keyfile_path) log.info(" %s", e) break except Exception as e: log("auth_publickey() loading as %s", pkey_classname, exc_info=True) key_data = load_binary_file(keyfile_path) if key_data and key_data.find(b"BEGIN OPENSSH PRIVATE KEY")>=0 and paramiko.__version__<"2.7": log.warn("Warning: private key '%s'", keyfile_path) log.warn(" this file seems to be using OpenSSH's own format") log.warn(" please convert it to something more standard (ie: PEM)") log.warn(" so it can be used with the paramiko backend") log.warn(" or switch to the OpenSSH backend with '--ssh=ssh'") if key: log("auth_publickey using %s as %s: %s", keyfile_path, pkey_classname, keymd5(key)) try: transport.auth_publickey(username, key) except SSHException as e: log("key '%s' rejected", keyfile_path, exc_info=True) log.info("SSH authentication using key '%s' failed:", keyfile_path) log.info(" %s", e) else: if transport.is_authenticated(): break else: log.error("Error: cannot load private key '%s'", keyfile_path) def auth_none(): log("trying none authentication") try: transport.auth_none(username) except SSHException: log("auth_none()", exc_info=True) def auth_password(): log("trying password authentication") try: transport.auth_password(username, password) except SSHException as e: log("auth_password(..)", exc_info=True) log.info("SSH password authentication failed:") log.info(" %s", getattr(e, "message", e)) def auth_interactive(): log("trying interactive authentication") class iauthhandler: def __init__(self): self.authcount = 0 def handlestuff(self, _title, _instructions, prompt_list): p = [] for pent in prompt_list: if self.authcount==0 and password: p.append(password) else: p.append(input_pass(pent[0])) self.authcount += 1 return p try: myiauthhandler = iauthhandler() transport.auth_interactive(username, myiauthhandler.handlestuff, "") except SSHException as e: log("auth_interactive(..)", exc_info=True) log.info("SSH password authentication failed:") log.info(" %s", getattr(e, "message", e)) banner = transport.get_banner() if banner: log.info("SSH server banner:") for x in banner.splitlines(): log.info(" %s", x) if paramiko_config and "auth" in paramiko_config: auth = paramiko_config.get("auth", "").split("+") AUTH_OPTIONS = ("none", "agent", "key", "password") if any(a for a in auth if a not in AUTH_OPTIONS): raise InitExit(EXIT_SSH_FAILURE, "invalid ssh authentication module specified: %s" % csv(a for a in auth if a not in AUTH_OPTIONS)) else: auth = [] if configbool("noneauthentication", NONE_AUTH): auth.append("none") if password and configbool("passwordauthentication", PASSWORD_AUTH): auth.append("password") if configbool("agentauthentication", AGENT_AUTH): auth.append("agent") # Some people do two-factor using KEY_AUTH to kick things off, so this happens first if configbool("keyauthentication", KEY_AUTH): auth.append("key") if not password and configbool("passwordauthentication", PASSWORD_AUTH): auth.append("password") #def doauth(authtype): # return authtype in auth and not transport.is_authenticated() log("starting authentication, authentication methods: %s", auth) # per the RFC we probably should do none first always and read off the supported # methods, however, the current code seems to work fine with OpenSSH while not transport.is_authenticated() and auth: a = auth.pop(0) log("auth=%s", a) if a=="none": auth_none() elif a=="agent": auth_agent() elif a=="key": auth_publickey() elif a=="password": auth_interactive() if not transport.is_authenticated(): if password: auth_password() else: tries = configint("numberofpasswordprompts", PASSWORD_RETRY) for _ in range(tries): password = input_pass("please enter the SSH password for %s@%s:" % (username, host)) if not password: break auth_password() if transport.is_authenticated(): break if not transport.is_authenticated(): transport.close() raise InitExit(EXIT_CONNECTION_FAILED, "SSH Authentication on %s failed" % host)
def do_ssh_paramiko_connect_to(transport, host, username, password, host_config=None): from paramiko import SSHException, RSAKey, PasswordRequiredException from paramiko.agent import Agent from paramiko.hostkeys import HostKeys log("do_ssh_paramiko_connect_to%s", (transport, host, username, password, host_config)) log("SSH transport %s", transport) host_key = transport.get_remote_server_key() assert host_key, "no remote server key" log("remote_server_key=%s", keymd5(host_key)) if VERIFY_HOSTKEY: host_keys = HostKeys() host_keys_filename = None KNOWN_HOSTS = get_ssh_known_hosts_files() for known_hosts in KNOWN_HOSTS: host_keys.clear() try: path = os.path.expanduser(known_hosts) if os.path.exists(path): host_keys.load(path) log("HostKeys.load(%s) successful", path) host_keys_filename = path break except IOError: log("HostKeys.load(%s)", known_hosts, exc_info=True) log("host keys=%s", host_keys) keys = host_keys.lookup(host) known_host_key = (keys or {}).get(host_key.get_name()) def keyname(): return host_key.get_name().replace("ssh-", "") if host_key == known_host_key: assert host_key log("%s host key '%s' OK for host '%s'", keyname(), keymd5(host_key), host) else: dnscheck = "" if host_config: verifyhostkeydns = host_config.get("verifyhostkeydns") if verifyhostkeydns and verifyhostkeydns.lower( ) in TRUE_OPTIONS: try: from xpra.net.sshfp import check_host_key dnscheck = check_host_key(host, host_key) except ImportError as e: log("verifyhostkeydns failed", exc_info=True) log.warn("Warning: cannot check SSHFP DNS records") log.warn(" %s", e) log.info("dnscheck=%s", dnscheck) def adddnscheckinfo(q): if dnscheck is not True: q += ["SSHFP validation failed:", dnscheck] if dnscheck is True: #DNSSEC provided a matching record log.info("found a valid SSHFP record for host %s", host) elif known_host_key: log.warn("Warning: SSH server key mismatch") qinfo = [ "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!", "IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!", "Someone could be eavesdropping on you right now (man-in-the-middle attack)!", "It is also possible that a host key has just been changed.", "The fingerprint for the %s key sent by the remote host is" % keyname(), keymd5(host_key), ] adddnscheckinfo(qinfo) if VERIFY_STRICT: log.warn("Host key verification failed.") #TODO: show alert with no option to accept key qinfo += [ "Please contact your system administrator.", "Add correct host key in %s to get rid of this message.", "Offending %s key in %s" % (keyname(), host_keys_filename), "ECDSA host key for %s has changed and you have requested strict checking." % keyname(), ] sys.stderr.write(os.linesep.join(qinfo)) transport.close() raise InitExit(EXIT_SSH_KEY_FAILURE, "SSH Host key has changed") if not confirm_key(qinfo): transport.close() raise InitExit(EXIT_SSH_KEY_FAILURE, "SSH Host key has changed") else: assert (not keys) or (host_key.get_name() not in keys) if not keys: log.warn("Warning: unknown SSH host") else: log.warn("Warning: unknown %s SSH host key", keyname()) qinfo = [ "The authenticity of host '%s' can't be established." % (host, ), "%s key fingerprint is" % keyname(), keymd5(host_key), ] adddnscheckinfo(qinfo) if not confirm_key(qinfo): transport.close() raise InitExit(EXIT_SSH_KEY_FAILURE, "Unknown SSH host '%s'" % host) if ADD_KEY: try: if not host_keys_filename: #the first one is the default, #ie: ~/.ssh/known_hosts on posix host_keys_filename = os.path.expanduser(KNOWN_HOSTS[0]) log("adding %s key for host '%s' to '%s'", keyname(), host, host_keys_filename) if not os.path.exists(host_keys_filename): keys_dir = os.path.dirname(host_keys_filename) if not os.path.exists(keys_dir): log("creating keys directory '%s'", keys_dir) os.mkdir(keys_dir, 0o700) elif not os.path.isdir(keys_dir): log.warn("Warning: '%s' is not a directory") log.warn(" key not saved") if os.path.exists(keys_dir) and os.path.isdir( keys_dir): log("creating known host file '%s'", host_keys_filename) with umask_context(0o133): with open(host_keys_filename, 'a+'): pass host_keys.add(host, host_key.get_name(), host_key) host_keys.save(host_keys_filename) except OSError as e: log("failed to add key to '%s'", host_keys_filename) log.error("Error adding key to '%s'", host_keys_filename) log.error(" %s", e) except Exception as e: log.error("cannot add key", exc_info=True) def auth_agent(): agent = Agent() agent_keys = agent.get_keys() log("agent keys: %s", agent_keys) if agent_keys: for agent_key in agent_keys: log("trying ssh-agent key '%s'", keymd5(agent_key)) try: transport.auth_publickey(username, agent_key) if transport.is_authenticated(): log("authenticated using agent and key '%s'", keymd5(agent_key)) break except SSHException: log("agent key '%s' rejected", keymd5(agent_key), exc_info=True) if not transport.is_authenticated(): log.info("agent authentication failed, tried %i key%s", len(agent_keys), engs(agent_keys)) def auth_publickey(): log("trying public key authentication") for keyfile in ("id_rsa", "id_dsa"): keyfile_path = osexpand(os.path.join("~/", ".ssh", keyfile)) if not os.path.exists(keyfile_path): log("no keyfile at '%s'", keyfile_path) continue key = None try: key = RSAKey.from_private_key_file(keyfile_path) except PasswordRequiredException: log("%s keyfile requires a passphrase", keyfile_path) passphrase = input_pass("please enter the passphrase for %s:" % (keyfile_path, )) if passphrase: try: key = RSAKey.from_private_key_file( keyfile_path, passphrase) except SSHException as e: log("from_private_key_file", exc_info=True) log.info("cannot load key from file '%s':", keyfile_path) log.info(" %s", e) if key: log("auth_publickey using %s: %s", keyfile_path, keymd5(key)) try: transport.auth_publickey(username, key) except SSHException as e: log("key '%s' rejected", keyfile_path, exc_info=True) log.info("SSH authentication using key '%s' failed:", keyfile_path) log.info(" %s", e) else: if transport.is_authenticated(): break def auth_none(): log("trying none authentication") try: transport.auth_none(username) except SSHException as e: log("auth_none()", exc_info=True) def auth_password(): log("trying password authentication") try: transport.auth_password(username, password) except SSHException as e: log("auth_password(..)", exc_info=True) log.info("SSH password authentication failed: %s", e) def auth_interactive(): log("trying interactive authentication") class iauthhandler: def __init__(self): self.authcount = 0 def handlestuff(self, title, instructions, prompt_list): p = [] for pent in prompt_list: if self.authcount == 0 and password: p.append(password) else: p.append(input_pass(pent[0])) self.authcount += 1 return p try: myiauthhandler = iauthhandler() transport.auth_interactive(username, myiauthhandler.handlestuff, "") except SSHException as e: log("auth_interactive(..)", exc_info=True) log.info("SSH password authentication failed: %s", e) banner = transport.get_banner() if banner: log.info("SSH server banner:") for x in banner.splitlines(): log.info(" %s", x) log("starting authentication") # per the RFC we probably should do none first always and read off the supported # methods, however, the current code seems to work fine with OpenSSH if not transport.is_authenticated() and NONE_AUTH: auth_none() # Some people do two-factor using KEY_AUTH to kick things off, so this happens first if not transport.is_authenticated() and KEY_AUTH: auth_publickey() if not transport.is_authenticated() and PASSWORD_AUTH: auth_interactive() if not transport.is_authenticated() and PASSWORD_AUTH and password: auth_password() if not transport.is_authenticated() and AGENT_AUTH: auth_agent() if not transport.is_authenticated() and PASSWORD_AUTH and not password: for _ in range(1 + PASSWORD_RETRY): password = input_pass("please enter the SSH password for %s@%s" % (username, host)) if not password: break auth_password() if transport.is_authenticated(): break if not transport.is_authenticated(): transport.close() raise InitException("SSH Authentication on %s failed" % host)
def do_ssh_paramiko_connect_to(sock, host, port, username, password, proxy_command, remote_xpra, socket_dir, display_as_args, target): from paramiko import SSHException, Transport, Agent, RSAKey, PasswordRequiredException from paramiko.hostkeys import HostKeys transport = Transport(sock) transport.use_compression(False) log("SSH transport %s", transport) try: transport.start_client() except SSHException as e: log("start_client()", exc_info=True) raise InitException("SSH negotiation failed: %s" % e) host_key = transport.get_remote_server_key() assert host_key, "no remote server key" log("remote_server_key=%s", keymd5(host_key)) if VERIFY_HOSTKEY: host_keys = HostKeys() host_keys_filename = None KNOWN_HOSTS = get_ssh_known_hosts_files() for known_hosts in KNOWN_HOSTS: host_keys.clear() try: path = os.path.expanduser(known_hosts) if os.path.exists(path): host_keys.load(path) log("HostKeys.load(%s) successful", path) host_keys_filename = path break except IOError: log("HostKeys.load(%s)", known_hosts, exc_info=True) log("host keys=%s", host_keys) keys = host_keys.lookup(host) known_host_key = (keys or {}).get(host_key.get_name()) def keyname(): return host_key.get_name().replace("ssh-", "") if host_key==known_host_key: assert host_key log("%s host key '%s' OK for host '%s'", keyname(), keymd5(host_key), host) else: if known_host_key: log.warn("Warning: SSH server key mismatch") qinfo = [ "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!", "IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!", "Someone could be eavesdropping on you right now (man-in-the-middle attack)!", "It is also possible that a host key has just been changed.", "The fingerprint for the %s key sent by the remote host is" % keyname(), keymd5(host_key), ] if VERIFY_STRICT: log.warn("Host key verification failed.") #TODO: show alert with no option to accept key qinfo += [ "Please contact your system administrator.", "Add correct host key in %s to get rid of this message.", "Offending %s key in %s" % (keyname(), host_keys_filename), "ECDSA host key for %s has changed and you have requested strict checking." % keyname(), ] sys.stderr.write(os.linesep.join(qinfo)) transport.close() raise InitExit(EXIT_SSH_KEY_FAILURE, "SSH Host key has changed") if not confirm_key(qinfo): transport.close() raise InitExit(EXIT_SSH_KEY_FAILURE, "SSH Host key has changed") else: assert (not keys) or (host_key.get_name() not in keys) if not keys: log.warn("Warning: unknown SSH host") else: log.warn("Warning: unknown %s SSH host key", keyname()) qinfo = [ "The authenticity of host '%s' can't be established." % (host,), "%s key fingerprint is" % keyname(), keymd5(host_key), ] if not confirm_key(qinfo): transport.close() raise InitExit(EXIT_SSH_KEY_FAILURE, "Unknown SSH host '%s'" % host) if ADD_KEY: try: if not host_keys_filename: #the first one is the default, #ie: ~/.ssh/known_hosts on posix host_keys_filename = os.path.expanduser(KNOWN_HOSTS[0]) log("adding %s key for host '%s' to '%s'", keyname(), host, host_keys_filename) if not os.path.exists(host_keys_filename): keys_dir = os.path.dirname(host_keys_filename) if not os.path.exists(keys_dir): log("creating keys directory '%s'", keys_dir) os.mkdir(keys_dir, 0o700) elif not os.path.isdir(keys_dir): log.warn("Warning: '%s' is not a directory") log.warn(" key not saved") if os.path.exists(keys_dir) and os.path.isdir(keys_dir): log("creating known host file '%s'", host_keys_filename) with umask_context(0o133): with open(host_keys_filename, 'a+'): pass host_keys.add(host, host_key.get_name(), host_key) host_keys.save(host_keys_filename) except OSError as e: log("failed to add key to '%s'", host_keys_filename) log.error("Error adding key to '%s'", host_keys_filename) log.error(" %s", e) except Exception as e: log.error("cannot add key", exc_info=True) def auth_agent(): agent = Agent() agent_keys = agent.get_keys() log("agent keys: %s", agent_keys) if agent_keys: for agent_key in agent_keys: log("trying ssh-agent key '%s'", keymd5(agent_key)) try: transport.auth_publickey(username, agent_key) if transport.is_authenticated(): log("authenticated using agent and key '%s'", keymd5(agent_key)) break except SSHException: log("agent key '%s' rejected", keymd5(agent_key), exc_info=True) if not transport.is_authenticated(): log.info("agent authentication failed, tried %i key%s", len(agent_keys), engs(agent_keys)) def auth_publickey(): log("trying public key authentication") for keyfile in ("id_rsa", "id_dsa"): keyfile_path = osexpand(os.path.join("~/", ".ssh", keyfile)) if not os.path.exists(keyfile_path): log("no keyfile at '%s'", keyfile_path) continue key = None try: key = RSAKey.from_private_key_file(keyfile_path) except PasswordRequiredException: log("%s keyfile requires a passphrase", keyfile_path) passphrase = input_pass("please enter the passphrase for %s:" % (keyfile_path,)) if passphrase: try: key = RSAKey.from_private_key_file(keyfile_path, passphrase) except SSHException as e: log("from_private_key_file", exc_info=True) log.info("cannot load key from file '%s':", keyfile_path) log.info(" %s", e) if key: log("auth_publickey using %s: %s", keyfile_path, keymd5(key)) try: transport.auth_publickey(username, key) except SSHException as e: log("key '%s' rejected", keyfile_path, exc_info=True) log.info("SSH authentication using key '%s' failed:", keyfile_path) log.info(" %s", e) else: if transport.is_authenticated(): break def auth_none(): log("trying none authentication") try: transport.auth_none(username) except SSHException as e: log("auth_none()", exc_info=True) def auth_password(): log("trying password authentication") try: transport.auth_password(username, password) except SSHException as e: log("auth_password(..)", exc_info=True) log.info("SSH password authentication failed: %s", e) banner = transport.get_banner() if banner: log.info("SSH server banner:") for x in banner.splitlines(): log.info(" %s", x) log("starting authentication") if not transport.is_authenticated() and NONE_AUTH: auth_none() if not transport.is_authenticated() and PASSWORD_AUTH and password: auth_password() if not transport.is_authenticated() and AGENT_AUTH: auth_agent() if not transport.is_authenticated() and KEY_AUTH: auth_publickey() if not transport.is_authenticated() and PASSWORD_AUTH and not password: for _ in range(1+PASSWORD_RETRY): password = input_pass("please enter the SSH password for %s@%s" % (username, host)) if not password: break auth_password() if transport.is_authenticated(): break if not transport.is_authenticated(): transport.close() raise InitException("SSH Authentication failed") assert len(remote_xpra)>0 log("will try to run xpra from: %s", remote_xpra) for xpra_cmd in remote_xpra: try: chan = transport.open_session(window_size=None, max_packet_size=0, timeout=60) chan.set_name("find %s" % xpra_cmd) except SSHException as e: log("open_session", exc_info=True) raise InitException("failed to open SSH session: %s" % e) cmd = "which %s" % xpra_cmd log("exec_command('%s')", cmd) chan.exec_command(cmd) #poll until the command terminates: start = monotonic_time() while not chan.exit_status_ready(): if monotonic_time()-start>10: chan.close() raise InitException("SSH test command '%s' timed out" % cmd) log("exit status is not ready yet, sleeping") time.sleep(0.01) r = chan.recv_exit_status() log("exec_command('%s')=%s", cmd, r) chan.close() if r!=0: continue cmd = xpra_cmd + " " + " ".join(shellquote(x) for x in proxy_command) if socket_dir: cmd += " \"--socket-dir=%s\"" % socket_dir if display_as_args: cmd += " " cmd += " ".join(shellquote(x) for x in display_as_args) log("cmd(%s, %s)=%s", proxy_command, display_as_args, cmd) #see https://github.com/paramiko/paramiko/issues/175 #WINDOW_SIZE = 2097152 log("trying to open SSH session, window-size=%i, timeout=%i", WINDOW_SIZE, TIMEOUT) try: chan = transport.open_session(window_size=WINDOW_SIZE, max_packet_size=0, timeout=TIMEOUT) chan.set_name("run-xpra") except SSHException as e: log("open_session", exc_info=True) raise InitException("failed to open SSH session: %s" % e) else: log("channel exec_command(%s)" % cmd) chan.exec_command(cmd) info = { "host" : host, "port" : port, } conn = SSHSocketConnection(chan, sock, target, info) conn.timeout = SOCKET_TIMEOUT conn.start_stderr_reader() child = None conn.process = (child, "ssh", cmd) return conn raise Exception("all SSH remote proxy commands have failed")