This code is not working:
def sftp_connection(self):
import pysftp
connection = pysftp.Connection(self.host, username=self.system_name,
private_key=os.path.join(HOME, '.ssh', 'id_rsa'))
# in the next lines I try to use AutoAddPolicy
client = connection.sftp_client()
client.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
client.set_missing_host_key_policy(paramiko.client.AutoAddPolicy)
return connection
This is the exception:
Traceback (most recent call last):
File "/home/u/src/myapp-glo/myapp_doxis_archiv/tests/test_doxis_archiv.py", line 85, in test_beleg_to_archiv__ftpservercontext
info_dict = beleg_to_archiv(beleg, self.archiv_belegart)
File "/home/u/src/myapp-glo/myapp_doxis_archiv/beleg_to_archiv.py", line 28, in beleg_to_archiv
transfer_log=send_data_via_ftp(temp_directory, archiv_belegart.doxis_archiv)
File "/home/u/src/myapp-glo/myapp_doxis_archiv/beleg_to_archiv.py", line 71, in send_data_via_ftp
with doxis_archiv.sftp_connection() as sftp:
File "/home/u/src/myapp-glo/myapp_doxis_archiv/models.py", line 43, in sftp_connection
private_key=os.path.join(HOME, '.ssh', 'id_rsa'))
File "/home/u/local/lib/python2.7/site-packages/pysftp/__init__.py", line 132, in __init__
self._tconnect['hostkey'] = self._cnopts.get_hostkey(host)
File "/home/u/local/lib/python2.7/site-packages/pysftp/__init__.py", line 71, in get_hostkey
raise SSHException("No hostkey for host %s found." % host)
SSHException: No hostkey for host localhost found.
I get the exception before I try to set the host_key_policy
.
I could not find a different way to access the client instance via pysftp.
Is there a way to set AutoAddPolicy
before I get the exception?
There is a related question. My question is about how to apply one of the several solutions which are provided in the old question.
pysftp does not use Paramiko SSHClient
class at all, it uses more low-level Transport
class. So it does not have the MissingHostKeyPolicy
functionality of SSHClient
.
You would have to implement it on your own.
One possible implementation can be:
host = 'example.com'
# Loads .ssh/known_hosts
cnopts = CnOpts()
hostkeys = None
if cnopts.hostkeys.lookup(host) == None:
print("New host - will accept any host key")
# Backup loaded .ssh/known_hosts file
hostkeys = cnopts.hostkeys
# And do not verify host key of the new host
cnopts.hostkeys = None
with Connection(host, username=user, private_key=pkey, cnopts=cnopts) as sftp:
if hostkeys != None:
print("Connected to new host, caching its hostkey")
hostkeys.add(
host, sftp.remote_server_key.get_name(), sftp.remote_server_key)
hostkeys.save(pysftp.helpers.known_hosts())
I've implemented auto_add_key
in my pysftp github fork.
auto_add_key
will add the key to known_hosts
if auto_add_key=True
Once a key is present for a host in known_hosts
this key will be checked.
Please reffer Martin Prikryl -> answer about security concerns.
Though for an absolute security, you should not retrieve the host key remotely, as you cannot be sure, if you are not being attacked already.
import pysftp as sftp
def push_file_to_server():
s = sftp.Connection(host='138.99.99.129', username='root', password='pass', auto_add_key=True)
local_path = "testme.txt"
remote_path = "/home/testme.txt"
s.put(local_path, remote_path)
s.close()
push_file_to_server()
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