Add DSA support, move location & increase key size

Credit: https://github.com/micheloosterhof/kippo/
Add DSA SSH key support
Move from: “./public.key” to “./data/ssh_host_rsa_key.pub“
Increase key size from 1024 to 2048 bits

kippo.cfg.dist

@@ -76,10 +76,10 @@ txtcmds_path = txtcmds
 
 # Public and private SSH key files. If these don't exist, they are created
 # automatically.
-#
+rsa_public_key = data/ssh_host_rsa_key.pub
-# (defaults: public.key and private.key)
+rsa_private_key = data/ssh_host_rsa_key
-public_key = public.key
+dsa_public_key = data/ssh_host_dsa_key.pub
-private_key = private.key
+dsa_private_key = data/ssh_host_dsa_key
 
 # Initial root password. NO LONGER USED!
 # Instead, see {data_path}/userdb.txt

kippo.tac

@@ -28,10 +28,13 @@ from kippo.core.config import config
 factory = honeypot.HoneyPotSSHFactory()
 factory.portal = portal.Portal(honeypot.HoneyPotRealm())
 
-pubKeyString, privKeyString = honeypot.getRSAKeys()
+rsa_pubKeyString, rsa_privKeyString = honeypot.getRSAKeys()
+dsa_pubKeyString, dsa_privKeyString = honeypot.getDSAKeys()
 factory.portal.registerChecker(honeypot.HoneypotPasswordChecker())
-factory.publicKeys = {'ssh-rsa': keys.Key.fromString(data=pubKeyString)}
+factory.publicKeys = {'ssh-rsa': keys.Key.fromString(data=rsa_pubKeyString),
-factory.privateKeys = {'ssh-rsa': keys.Key.fromString(data=privKeyString)}
+                      'ssh-dss': keys.Key.fromString(data=dsa_pubKeyString)}
+factory.privateKeys = {'ssh-rsa': keys.Key.fromString(data=rsa_privKeyString),
+                       'ssh-dss': keys.Key.fromString(data=dsa_privKeyString)}
 
 cfg = config()
 if cfg.has_option('honeypot', 'ssh_addr'):

kippo/core/honeypot.py

@@ -698,21 +698,39 @@ class HoneypotPasswordChecker:
 
 def getRSAKeys():
     cfg = config()
-    public_key = cfg.get('honeypot', 'public_key')
+    public_key = cfg.get('honeypot', 'rsa_public_key')
-    private_key = cfg.get('honeypot', 'private_key')
+    private_key = cfg.get('honeypot', 'rsa_private_key')
     if not (os.path.exists(public_key) and os.path.exists(private_key)):
-        # generate a RSA keypair
+        print "[i] Generating new RSA keypair..."
-        print "Generating RSA keypair..."
         from Crypto.PublicKey import RSA
         from twisted.python import randbytes
-        KEY_LENGTH = 1024
+        KEY_LENGTH = 2048
         rsaKey = RSA.generate(KEY_LENGTH, randbytes.secureRandom)
-        publicKeyString = keys.Key(rsaKey).public().toString('openssh')
+        publicKeyString = twisted.conch.ssh.keys.Key(rsaKey).public().toString('openssh')
-        privateKeyString = keys.Key(rsaKey).toString('openssh')
+        privateKeyString = twisted.conch.ssh.keys.Key(rsaKey).toString('openssh')
-        # save keys for next time
         file(public_key, 'w+b').write(publicKeyString)
         file(private_key, 'w+b').write(privateKeyString)
-        print "done."
+        print "[i] Done."
+    else:
+        publicKeyString = file(public_key).read()
+        privateKeyString = file(private_key).read()
+    return publicKeyString, privateKeyString
+
+def getDSAKeys():
+    cfg = config()
+    public_key = cfg.get('honeypot', 'dsa_public_key')
+    private_key = cfg.get('honeypot', 'dsa_private_key')
+    if not (os.path.exists(public_key) and os.path.exists(private_key)):
+        print "[i] Generating new DSA keypair..."
+        from Crypto.PublicKey import DSA
+        from twisted.python import randbytes
+        KEY_LENGTH = 1024
+        dsaKey = DSA.generate(KEY_LENGTH, randbytes.secureRandom)
+        publicKeyString = twisted.conch.ssh.keys.Key(dsaKey).public().toString('openssh')
+        privateKeyString = twisted.conch.ssh.keys.Key(dsaKey).toString('openssh')
+        file(public_key, 'w+b').write(publicKeyString)
+        file(private_key, 'w+b').write(privateKeyString)
+        print "[i] Done."
     else:
         publicKeyString = file(public_key).read()
         privateKeyString = file(private_key).read()