Authentication Failed error

[German Zavala Villafuerte]

Hello, I came across another problem during the routing_with_IPv4 file, the same error occurs during the exploring IPv6 file. The error is. Any help will be greatly appreciated. Thank you.

Fail: Authentication failed.

 

• This topic was modified 7 months ago by Ilya Baldin.

[Luis Contreras]

This may indicate that you may be having problems with the SSH key setup, have you tried running the “ConfigureEnviorment” and “HelloFabric” notebooks on the “fabric_config” directory?

[German Zavala Villafuerte]

I ran the “ConfigureEnviroment” without any problems. As for the “HelloFabric” everything runs fine until Step 6 where I get an authenticationException: Authentication Failed error.

 

---------------------------------------------------------------------------
AuthenticationException                   Traceback (most recent call last)
Cell In[6], line 4
      1 #node = slice.get_node('Node1')
      3 for node in slice.get_nodes():
----> 4     stdout, stderr = node.execute('echo Hello, FABRIC from node hostname -s')

File /opt/conda/lib/python3.10/site-packages/fabrictestbed_extensions/fablib/node.py:1542, in Node.execute(self, command, retry, retry_interval, username, private_key_file, private_key_passphrase, quiet, read_timeout, timeout, output_file)
   1537 logging.warning(
   1538     f"Exception in node.execute() (attempt #{attempt} of {retry}): {e}"
   1539 )
   1541 if attempt + 1 == retry:
-> 1542     raise e
   1544 # Fail, try again
   1545 if self.get_fablib_manager().get_log_level() == logging.DEBUG:

File /opt/conda/lib/python3.10/site-packages/fabrictestbed_extensions/fablib/node.py:1395, in Node.execute(self, command, retry, retry_interval, username, private_key_file, private_key_passphrase, quiet, read_timeout, timeout, output_file)
   1393 bastion = paramiko.SSHClient()
   1394 bastion.set_missing_host_key_policy(paramiko.AutoAddPolicy())
-> 1395 bastion.connect(
   1396     self.get_fablib_manager().get_bastion_public_addr(),
   1397     username=bastion_username,
   1398     key_filename=bastion_key_file,
   1399 )
   1401 bastion_transport = bastion.get_transport()
   1402 bastion_channel = bastion_transport.open_channel(
   1403     "direct-tcpip", dest_addr, src_addr
   1404 )

File /opt/conda/lib/python3.10/site-packages/paramiko/client.py:485, in SSHClient.connect(self, hostname, port, username, password, pkey, key_filename, timeout, allow_agent, look_for_keys, compress, sock, gss_auth, gss_kex, gss_deleg_creds, gss_host, banner_timeout, auth_timeout, channel_timeout, gss_trust_dns, passphrase, disabled_algorithms, transport_factory, auth_strategy)
    482 else:
    483     key_filenames = key_filename
--> 485 self._auth(
    486     username,
    487     password,
    488     pkey,
    489     key_filenames,
    490     allow_agent,
    491     look_for_keys,
    492     gss_auth,
    493     gss_kex,
    494     gss_deleg_creds,
    495     t.gss_host,
    496     passphrase,
    497 )

File /opt/conda/lib/python3.10/site-packages/paramiko/client.py:818, in SSHClient._auth(self, username, password, pkey, key_filenames, allow_agent, look_for_keys, gss_auth, gss_kex, gss_deleg_creds, gss_host, passphrase)
    816 # if we got an auth-failed exception earlier, re-raise it
    817 if saved_exception is not None:
--> 818     raise saved_exception
    819 raise SSHException("No authentication methods available")

File /opt/conda/lib/python3.10/site-packages/paramiko/client.py:794, in SSHClient._auth(self, username, password, pkey, key_filenames, allow_agent, look_for_keys, gss_auth, gss_kex, gss_deleg_creds, gss_host, passphrase)
    788 key = self._key_from_filepath(
    789     filename, pkey_class, passphrase
    790 )
    791 # for 2-factor auth a successfully auth'd key will result
    792 # in ['password']
    793 allowed_types = set(
--> 794     self._transport.auth_publickey(username, key)
    795 )
    796 two_factor = allowed_types & two_factor_types
    797 if not two_factor:

File /opt/conda/lib/python3.10/site-packages/paramiko/transport.py:1658, in Transport.auth_publickey(self, username, key, event)
   1655 if event is not None:
   1656     # caller wants to wait for event themselves
   1657     return []
-> 1658 return self.auth_handler.wait_for_response(my_event)

File /opt/conda/lib/python3.10/site-packages/paramiko/auth_handler.py:263, in AuthHandler.wait_for_response(self, event)
    261     if issubclass(e.__class__, PartialAuthentication):
    262         return e.allowed_types
--> 263     raise e
    264 return []

AuthenticationException: Authentication failed.

[Ilya Baldin]

Your *bastion* key is not properly set up. No other notebooks will execute properly until you can run this notebook all the way through. You can try to troubleshoot your setup – make sure that ~/work/fabric_config/fabric_rc file has a variable declaration FABRIC_BASTION_KEY_LOCATION that points to the correct file – this is the most likely problem.

Alternatively you can regenerate a bastion key pair and try from the beginning:

1. Please go to the FABRIC portal click Experiments -> Manage SSH keys
2. Select the ‘Bastion’ tab and generate a new Bastion key pair.
3. Download both the public and the private parts of the keypair
4. Copy the private part of the key pair into the ~/work/fabric_config/ directory in your Jupyter Hub (assuming you are using the Jupyter Hub)
   • Note that in the file browser in Jupyter Hub ~/work/ is not visible, which is fine – you can simply select fabric_config and drag and drop the key file in there
5. Re execute ‘Configure Environment’ notebook
   • Making sure to update the path to the bastion private key with the new name
6. Re execute ‘Hello FABRIC’ notebook start to finish and make sure it completes

 

[Yuvaraj Munian]

During Configure the environment,

THis is what I am getting:

bash: zip: command not found
fabric_ssh_tunnel_tools/
fabric_ssh_tunnel_tools/stop_ssh_tunnel.sh
fabric_ssh_tunnel_tools/ssh_config
fabric_ssh_tunnel_tools/README
fabric_ssh_tunnel_tools/start_ssh_tunnel.sh
fabric_ssh_tunnel_tools/slice_key
fabric_ssh_tunnel_tools/.ipynb_checkpoints/
fabric_ssh_tunnel_tools/.ipynb_checkpoints/README-checkpoint
fabric_ssh_tunnel_tools/bastion_key
cp: cannot stat 'fabric_ssh_tunnel_tools.zip': No such file or directory
: 1

Also When i go for "Hello Fabric" again it says authentication failed in the last step. I have checked all the file and directory and path all are correct. Can you please check and let me know.

[Author]

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