diff options
| -rw-r--r-- | paramiko/client.py | 48 |
1 files changed, 27 insertions, 21 deletions
diff --git a/paramiko/client.py b/paramiko/client.py index d4bd8cb6..55365705 100644 --- a/paramiko/client.py +++ b/paramiko/client.py @@ -341,37 +341,43 @@ class SSHClient (ClosingContextManager): t.set_log_channel(self._log_channel) if banner_timeout is not None: t.banner_timeout = banner_timeout - t.start_client(timeout=timeout) - t.set_sshclient(self) - ResourceManager.register(self, t) - - server_key = t.get_remote_server_key() - keytype = server_key.get_name() if port == SSH_PORT: server_hostkey_name = hostname else: server_hostkey_name = "[%s]:%d" % (hostname, port) + our_server_keys = None # If GSS-API Key Exchange is performed we are not required to check the # host key, because the host is authenticated via GSS-API / SSPI as # well as our client. if not self._transport.use_gss_kex: - our_server_key = self._system_host_keys.get( - server_hostkey_name, {}).get(keytype) - if our_server_key is None: - our_server_key = self._host_keys.get(server_hostkey_name, - {}).get(keytype, None) - if our_server_key is None: - # will raise exception if the key is rejected; - # let that fall out - self._policy.missing_host_key(self, server_hostkey_name, - server_key) - # if the callback returns, assume the key is ok - our_server_key = server_key - - if server_key != our_server_key: - raise BadHostKeyException(hostname, server_key, our_server_key) + our_server_keys = self._system_host_keys.get(server_hostkey_name) + if our_server_keys is None: + our_server_keys = self._host_keys.get(server_hostkey_name) + if our_server_keys is not None: + keytype = our_server_keys.keys()[0] + sec_opts = t.get_security_options() + other_types = [x for x in sec_opts.key_types if x != keytype] + sec_opts.key_types = [keytype] + other_types + + t.start_client(timeout=timeout) + t.set_sshclient(self) + ResourceManager.register(self, t) + + if not self._transport.use_gss_kex: + server_key = t.get_remote_server_key() + if our_server_keys is None: + # will raise exception if the key is rejected + self._policy.missing_host_key( + self, server_hostkey_name, server_key + ) + else: + our_key = our_server_keys.get(server_key.get_name()) + if our_key != server_key: + if our_key is None: + our_key = list(our_server_keys.values())[0] + raise BadHostKeyException(hostname, server_key, our_key) if username is None: username = getpass.getuser() |