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-rw-r--r--python/vyos/remote.py26
1 files changed, 23 insertions, 3 deletions
diff --git a/python/vyos/remote.py b/python/vyos/remote.py
index ebbded67a..f683a6d5a 100644
--- a/python/vyos/remote.py
+++ b/python/vyos/remote.py
@@ -13,18 +13,35 @@
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
+from ftplib import FTP
import os
import socket
import sys
import tempfile
-from ftplib import FTP
import urllib.parse
import urllib.request
-from vyos.util import cmd
+from vyos.util import cmd, ask_yes_no
from vyos.version import get_version
-from paramiko import SSHClient
+from paramiko import SSHClient, SSHException, MissingHostKeyPolicy
+
+
+known_hosts_file = os.path.expanduser('~/.ssh/known_hosts')
+class InteractivePolicy(MissingHostKeyPolicy):
+ """
+ Policy for interactively querying the user on whether to proceed with
+ SSH connections to unknown hosts.
+ """
+ def missing_host_key(self, client, hostname, key):
+ print(f"Host '{hostname}' not found in known hosts.")
+ print('Fingerprint: ' + key.get_fingerprint().hex())
+ if ask_yes_no('Do you wish to continue?'):
+ if client._host_keys_filename and ask_yes_no('Do you wish to permanently add this host/key pair to known hosts?'):
+ client._host_keys.add(hostname, key.get_name(), key)
+ client.save_host_keys(client._host_keys_filename)
+ else:
+ raise SSHException(f"Cannot connect to unknown host '{hostname}'.")
## FTP routines
def transfer_ftp(mode, local_path, hostname, remote_path,\
@@ -67,6 +84,9 @@ def transfer_sftp(mode, local_path, hostname, remote_path,\
try:
with SSHClient() as ssh:
ssh.load_system_host_keys()
+ if os.path.exists(known_hosts_file):
+ ssh.load_host_keys(known_hosts_file)
+ ssh.set_missing_host_key_policy(InteractivePolicy())
ssh.connect(hostname, port, username, password, sock=sock)
with ssh.open_sftp() as sftp:
if mode == 'upload':