log ssh public key fingerpint in json log

cowrie/core/checkers.py

@@ -30,6 +30,7 @@ class HoneypotPublicKeyChecker:
     def requestAvatarId(self, credentials):
         _pubKey = keys.Key.fromString(credentials.blob)
         log.msg(format='public key attempt for user %(username)s with fingerprint %(fingerprint)s',
+                eventid='KIPP0016',
                 username=credentials.username,
                 fingerprint=_pubKey.fingerprint())
         return failure.Failure(error.ConchError('Incorrect signature'))

cowrie/core/output.py

@@ -47,6 +47,7 @@ import socket
 # KIPP0013 : env var requested
 # KIPP0014 : direct-tcpip request
 # KIPP0015 : direct-tcpip data
+# KIPP0016 : key fingerprint
 
 class Output(object):
     """