I needed to compare a host key from something other than a known_hosts file with what paramiko reports as part of the SSH connection today. If you must know, the host keys for these machines are retrieved a XMLRPC API… It turned out to be a lot easier than I thought. Here’s how I produced the host key entry as it appears in that API (as well as in the known_hosts file):
#!/usr/bin/python # A host key calculation example for Paramiko. # Args: # 1: hostname import base64 import os import paramiko import socket import sys # Socket connection to remote host sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((sys.argv, 22)) # Build a SSH transport t = paramiko.Transport(sock) t.start_client() key = t.get_remote_server_key() print '%s %s' %(key.get_name(), base64.encodestring(key.__str__()).replace('\n', '')) t.close() sock.close()
Note that I could also have constructed a paramiko key object based on the output of the XMLRPC API and then compared those two objects, but I prefer the human readable strings.