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# SPDX-FileCopyrightText: 2020-2024 Greenbone AG
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
import unittest
from io import StringIO
from pathlib import Path
from unittest.mock import MagicMock, Mock, patch
import paramiko
from gvm.connections import (
DEFAULT_HOSTNAME,
DEFAULT_KNOWN_HOSTS_FILE,
DEFAULT_SSH_PASSWORD,
DEFAULT_SSH_PORT,
DEFAULT_SSH_USERNAME,
GvmConnection,
SSHConnection,
)
from gvm.errors import GvmError
class AbortException(Exception):
"""Just for testing purposes"""
class SSHConnectionTestCase(unittest.TestCase):
# pylint: disable=protected-access, invalid-name
def setUp(self):
self.known_hosts_file = Path("known_hosts")
self.known_hosts_file.write_text(
"127.0.0.1 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBOZWi"
"fs+DoMqIa5Nr0wiVrzQNpMbUwaLzuSTN6rNrYA\n",
encoding="utf-8",
)
def tearDown(self):
self.known_hosts_file.unlink(missing_ok=True)
def test_init_no_args(self):
ssh_connection = SSHConnection()
self.check_ssh_connection_for_default_values(ssh_connection)
def test_init_with_none(self):
ssh_connection = SSHConnection(
timeout=None, hostname=None, port=None, username=None, password=None
)
self.check_ssh_connection_for_default_values(ssh_connection)
def check_ssh_connection_for_default_values(
self, ssh_connection: SSHConnection
):
self.assertIsInstance(ssh_connection, SSHConnection)
self.assertEqual(ssh_connection.hostname, DEFAULT_HOSTNAME)
self.assertEqual(ssh_connection.port, DEFAULT_SSH_PORT)
self.assertEqual(ssh_connection.username, DEFAULT_SSH_USERNAME)
self.assertEqual(ssh_connection.password, DEFAULT_SSH_PASSWORD)
self.assertEqual(
ssh_connection.known_hosts_file,
Path.home() / DEFAULT_KNOWN_HOSTS_FILE,
)
def test_connect_error(self):
ssh_connection = SSHConnection(known_hosts_file=self.known_hosts_file)
with self.assertRaises(GvmError, msg="SSH Connection failed"):
ssh_connection.connect()
def test_connect_error_auto_accept_host(self):
ssh_connection = SSHConnection(
known_hosts_file=self.known_hosts_file, auto_accept_host=True
)
with self.assertRaises(GvmError, msg="SSH Connection failed"):
ssh_connection.connect()
def test_connect(self):
with patch("paramiko.SSHClient") as SSHClientMock:
client_mock = SSHClientMock.return_value
client_mock.exec_command.return_value = ["a", "b", "c"]
ssh_connection = SSHConnection(
known_hosts_file=self.known_hosts_file
)
ssh_connection.connect()
self.assertEqual(ssh_connection._stdin, "a")
self.assertEqual(ssh_connection._stdout, "b")
self.assertEqual(ssh_connection._stderr, "c")
ssh_connection.disconnect()
def test_connect_auto_accept_host(self):
with patch("paramiko.SSHClient", autospec=True) as SSHClientMock:
client_mock = SSHClientMock.return_value
client_mock.exec_command.return_value = ["a", "b", "c"]
ssh_connection = SSHConnection(
known_hosts_file=self.known_hosts_file, auto_accept_host=True
)
ssh_connection.connect()
self.assertEqual(ssh_connection._stdin, "a")
self.assertEqual(ssh_connection._stdout, "b")
self.assertEqual(ssh_connection._stderr, "c")
ssh_connection.disconnect()
def test_connect_unknown_host(self):
ssh_connection = SSHConnection(
hostname="0.0.0.1",
known_hosts_file=self.known_hosts_file,
timeout=1.0,
)
with self.assertRaises(
GvmError,
msg=(
"Could'nt establish a connection to fetch the remote "
"server key: [Errno 65] No route to host"
),
):
ssh_connection.connect()
def test_connect_denied_known_hosts_file(self):
self.known_hosts_file.chmod(0000)
ssh_connection = SSHConnection(
hostname="0.0.0.1", known_hosts_file=self.known_hosts_file
)
with self.assertRaises(
GvmError,
msg=(
"Could'nt establish a connection to fetch the remote "
"server key: [Errno 65] No route to host"
),
):
ssh_connection.connect()
def test_connect_no_known_hosts_file(self):
self.known_hosts_file.unlink(missing_ok=True)
ssh_connection = SSHConnection(
hostname="0.0.0.1",
known_hosts_file=self.known_hosts_file,
timeout=1.0,
)
with self.assertRaises(
GvmError,
msg=(
"Could'nt establish a connection to fetch the remote "
"server key: [Errno 65] No route to host"
),
):
ssh_connection.connect()
@patch("builtins.print")
def test_connect_adding_and_save_hostkey(self, _print_mock):
input_mock = MagicMock(spec=input)
key_io = StringIO(
"""-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
QyNTUxOQAAACB69SvZKJh/9VgSL0G27b5xVYa8nethH3IERbi0YqJDXwAAAKhjwAdrY8AH
awAAAAtzc2gtZWQyNTUxOQAAACB69SvZKJh/9VgSL0G27b5xVYa8nethH3IERbi0YqJDXw
AAAEA9tGQi2IrprbOSbDCF+RmAHd6meNSXBUQ2ekKXm4/8xnr1K9komH/1WBIvQbbtvnFV
hryd62EfcgRFuLRiokNfAAAAI2FsZXhfZ2F5bm9yQEFsZXhzLU1hY0Jvb2stQWlyLmxvY2
FsAQI=
-----END OPENSSH PRIVATE KEY-----"""
)
key = paramiko.Ed25519Key.from_private_key(key_io)
key_type = key.get_name().replace("ssh-", "").upper()
hostname = "0.0.0.0"
input_mock.side_effect = ["yes", "yes"]
ssh_connection = SSHConnection(
hostname=hostname,
known_hosts_file=self.known_hosts_file,
input=input_mock,
)
keys = self.known_hosts_file.read_text(encoding="utf-8")
self.assertEqual(
keys,
"127.0.0.1 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBOZWi"
"fs+DoMqIa5Nr0wiVrzQNpMbUwaLzuSTN6rNrYA\n",
)
with self.assertLogs("gvm.connections", level="INFO") as cm:
hostkeys = paramiko.HostKeys(filename=str(self.known_hosts_file))
ssh_connection._ssh_authentication_input_loop(
hostkeys=hostkeys, key=key
)
keys = self.known_hosts_file.read_text(encoding="utf-8")
self.assertEqual(
cm.output,
[
"INFO:gvm.connections.ssh:Warning: "
f"Permanently added '{hostname}' ({key_type}) to "
"the list of known hosts."
],
)
self.assertEqual(
keys,
"127.0.0.1 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBOZWi"
"fs+DoMqIa5Nr0wiVrzQNpMbUwaLzuSTN6rNrYA\n"
f"0.0.0.0 {key.get_name()} {key.get_base64()}\n",
)
@patch("builtins.print")
def test_connect_adding_and_dont_save_hostkey(self, _print_mock):
input_mock = MagicMock(spec=input)
key_io = StringIO(
"""-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
QyNTUxOQAAACB69SvZKJh/9VgSL0G27b5xVYa8nethH3IERbi0YqJDXwAAAKhjwAdrY8AH
awAAAAtzc2gtZWQyNTUxOQAAACB69SvZKJh/9VgSL0G27b5xVYa8nethH3IERbi0YqJDXw
AAAEA9tGQi2IrprbOSbDCF+RmAHd6meNSXBUQ2ekKXm4/8xnr1K9komH/1WBIvQbbtvnFV
hryd62EfcgRFuLRiokNfAAAAI2FsZXhfZ2F5bm9yQEFsZXhzLU1hY0Jvb2stQWlyLmxvY2
FsAQI=
-----END OPENSSH PRIVATE KEY-----"""
)
key = paramiko.Ed25519Key.from_private_key(key_io)
key_type = key.get_name().replace("ssh-", "").upper()
hostname = "0.0.0.0"
input_mock.side_effect = ["yes", "no"]
ssh_connection = SSHConnection(
hostname=hostname,
known_hosts_file=self.known_hosts_file,
input=input_mock,
)
keys = self.known_hosts_file.read_text(encoding="utf-8")
self.assertEqual(
keys,
"127.0.0.1 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBOZWi"
"fs+DoMqIa5Nr0wiVrzQNpMbUwaLzuSTN6rNrYA\n",
)
with self.assertLogs("gvm.connections", level="INFO") as cm:
hostkeys = paramiko.HostKeys(filename=str(self.known_hosts_file))
ssh_connection._ssh_authentication_input_loop(
hostkeys=hostkeys, key=key
)
keys = self.known_hosts_file.read_text(encoding="utf-8")
self.assertEqual(
cm.output,
[
"INFO:gvm.connections.ssh:Warning: "
f"Host '{hostname}' ({key_type}) not added to "
"the list of known hosts."
],
)
self.assertEqual(
keys,
"127.0.0.1 ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBOZWi"
"fs+DoMqIa5Nr0wiVrzQNpMbUwaLzuSTN6rNrYA\n",
)
def test_connect_wrong_input(self):
input_mock = MagicMock(spec=input)
stdout_mock = StringIO()
key_io = StringIO(
"""-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
QyNTUxOQAAACB69SvZKJh/9VgSL0G27b5xVYa8nethH3IERbi0YqJDXwAAAKhjwAdrY8AH
awAAAAtzc2gtZWQyNTUxOQAAACB69SvZKJh/9VgSL0G27b5xVYa8nethH3IERbi0YqJDXw
AAAEA9tGQi2IrprbOSbDCF+RmAHd6meNSXBUQ2ekKXm4/8xnr1K9komH/1WBIvQbbtvnFV
hryd62EfcgRFuLRiokNfAAAAI2FsZXhfZ2F5bm9yQEFsZXhzLU1hY0Jvb2stQWlyLmxvY2
FsAQI=
-----END OPENSSH PRIVATE KEY-----"""
)
key = paramiko.Ed25519Key.from_private_key(key_io)
hostname = "0.0.0.0"
key_type = key.get_name().replace("ssh-", "").upper()
inputs = ["asd", "yes", "yoo", "no"]
input_mock.side_effect = inputs
ssh_connection = SSHConnection(
hostname=hostname,
known_hosts_file=self.known_hosts_file,
input=input_mock,
file=stdout_mock,
)
with self.assertLogs("gvm.connections", level="INFO") as cm:
hostkeys = paramiko.HostKeys(filename=str(self.known_hosts_file))
ssh_connection._ssh_authentication_input_loop(
hostkeys=hostkeys, key=key
)
ret = stdout_mock.getvalue()
self.assertEqual(
cm.output,
[
"INFO:gvm.connections.ssh:Warning: "
f"Host '{hostname}' ({key_type}) not added to "
"the list of known hosts."
],
)
self.assertEqual(
ret,
f"The authenticity of host '{hostname}' can't be established.\n"
f"{key_type} key fingerprint is "
"J6VESFdD3xSChn8y9PzWzeF+1tl892mOy2TqkMLO4ow.\n"
"Are you sure you want to continue connecting (yes/no)? "
"Please type 'yes' or 'no': "
"Do you want to add 0.0.0.0 to known_hosts (yes/no)? "
"Please type 'yes' or 'no': ",
)
def test_user_denies_auth(self):
input_mock = MagicMock(spec=input)
stdout_mock = StringIO()
exit_mock = MagicMock(side_effect=AbortException("Exit called"))
key_io = StringIO(
"""-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
QyNTUxOQAAACB69SvZKJh/9VgSL0G27b5xVYa8nethH3IERbi0YqJDXwAAAKhjwAdrY8AH
awAAAAtzc2gtZWQyNTUxOQAAACB69SvZKJh/9VgSL0G27b5xVYa8nethH3IERbi0YqJDXw
AAAEA9tGQi2IrprbOSbDCF+RmAHd6meNSXBUQ2ekKXm4/8xnr1K9komH/1WBIvQbbtvnFV
hryd62EfcgRFuLRiokNfAAAAI2FsZXhfZ2F5bm9yQEFsZXhzLU1hY0Jvb2stQWlyLmxvY2
FsAQI=
-----END OPENSSH PRIVATE KEY-----"""
)
key = paramiko.Ed25519Key.from_private_key(key_io)
hostname = "0.0.0.0"
input_mock.return_value = "no"
ssh_connection = SSHConnection(
hostname=hostname,
known_hosts_file=self.known_hosts_file,
input=input_mock,
exit=exit_mock,
file=stdout_mock,
)
hostkeys = paramiko.HostKeys(filename=str(self.known_hosts_file))
with self.assertRaisesRegex(AbortException, "^Exit called"):
ssh_connection._ssh_authentication_input_loop(
hostkeys=hostkeys,
key=key,
)
exit_mock.assert_called_once_with(
"User denied key. Host key verification failed."
)
def test_disconnect(self):
with patch("paramiko.SSHClient") as SSHClientMock:
client_mock = SSHClientMock.return_value
client_mock.exec_command.return_value = ["a", "b", "c"]
ssh_connection = SSHConnection(
known_hosts_file=self.known_hosts_file
)
ssh_connection.connect()
self.assertEqual(ssh_connection._stdin, "a")
self.assertEqual(ssh_connection._stdout, "b")
self.assertEqual(ssh_connection._stderr, "c")
ssh_connection.disconnect()
# make sure the attributes have been deleted
with self.assertRaises(AttributeError):
type(ssh_connection._stdin)
with self.assertRaises(AttributeError):
type(ssh_connection._stdout)
with self.assertRaises(AttributeError):
type(ssh_connection._stderr)
def test_disconnect_os_error(self):
with patch("paramiko.SSHClient") as SSHClientMock:
client_mock = SSHClientMock.return_value
client_mock.exec_command.return_value = ["a", "b", "c"]
client_mock.close.side_effect = OSError
ssh_connection = SSHConnection(
known_hosts_file=self.known_hosts_file
)
ssh_connection.connect()
with self.assertRaises(OSError):
with self.assertLogs("gvm.connections", level="INFO") as cm:
ssh_connection.disconnect()
self.assertEqual(cm.output, ["Connection closing error: "])
def test_trigger_paramiko_ssh_except_in_get_remote_key(self):
with patch("paramiko.transport.Transport") as TransportMock:
client_mock = TransportMock.return_value
client_mock.start_client.side_effect = paramiko.SSHException("foo")
ssh_connection = SSHConnection(
hostname="0.0.0.0",
)
with self.assertRaises(
GvmError,
msg="Couldn't fetch the remote server key: foo",
):
ssh_connection._get_remote_host_key()
def test_trigger_oserror_in_get_remote_key_connect(self):
with patch("socket.socket") as SocketMock:
client_mock = SocketMock.return_value
client_mock.connect.side_effect = OSError("foo")
ssh_connection = SSHConnection(
hostname="0.0.0.0",
)
with self.assertRaises(
GvmError,
msg="Couldn't establish a connection to fetch the"
"remote server key: foo",
):
ssh_connection._get_remote_host_key()
def test_trigger_oserror_in_get_remote_key_disconnect(self):
with patch("paramiko.transport.Transport") as TransportMock:
client_mock = TransportMock.return_value
client_mock.close.side_effect = paramiko.SSHException("foo")
ssh_connection = SSHConnection(
hostname="0.0.0.0",
)
with self.assertRaises(
GvmError,
msg="Couldn't close the connection to the"
"remote server key: foo",
):
ssh_connection._get_remote_host_key()
def test_send(self):
with patch("paramiko.SSHClient") as SSHClientMock:
client_mock = SSHClientMock.return_value
stdin = Mock()
stdin.channel.send.return_value = 4
client_mock.exec_command.return_value = [stdin, None, None]
ssh_connection = SSHConnection(
known_hosts_file=self.known_hosts_file
)
ssh_connection.connect()
ssh_connection.send("blah")
ssh_connection.disconnect()
def test_send_error(self):
with patch("paramiko.SSHClient") as SSHClientMock:
client_mock = SSHClientMock.return_value
stdin = Mock()
stdin.channel.send.return_value = None
client_mock.exec_command.return_value = [stdin, None, None]
ssh_connection = SSHConnection(
known_hosts_file=self.known_hosts_file
)
ssh_connection.connect()
with self.assertRaises(
GvmError, msg="Remote closed the connection"
):
ssh_connection.send("blah")
ssh_connection.disconnect()
def test_send_and_slice(self):
with patch("paramiko.SSHClient") as SSHClientMock:
client_mock = SSHClientMock.return_value
stdin = Mock()
stdin.channel.send.side_effect = [2, 2]
client_mock.exec_command.return_value = [stdin, None, None]
ssh_connection = SSHConnection(
known_hosts_file=self.known_hosts_file
)
ssh_connection.connect()
ssh_connection.send("blah")
stdin.channel.send.assert_called()
with self.assertRaises(AssertionError):
stdin.channel.send.assert_called_once()
ssh_connection.disconnect()
def test_read(self):
with patch("paramiko.SSHClient") as SSHClientMock:
client_mock = SSHClientMock.return_value
stdout = Mock()
stdout.channel.recv.return_value = b"foo bar baz"
client_mock.exec_command.return_value = [None, stdout, None]
ssh_connection = SSHConnection(
known_hosts_file=self.known_hosts_file
)
ssh_connection.connect()
recved = ssh_connection._read()
self.assertEqual(recved, b"foo bar baz")
ssh_connection.disconnect()
def test_is_gvm_connection(self):
ssh_connection = SSHConnection(known_hosts_file=self.known_hosts_file)
self.assertTrue(isinstance(ssh_connection, GvmConnection))
|
