setstatus.py: add support for ssl

client now connect to server via tls.

setstatus.py

@@ -10,6 +10,7 @@
 # input is 0 or 1.
 
 import socket
+import ssl
 from sys import exit, argv, byteorder
 
 
@@ -51,8 +52,12 @@ def read_argument():
 
 def main(*status):
 
-    HOST = 'nr18.space'
+    HOST = 'localhost'
     PORT = 10001
+    SERVER_NAME = 'server.status.kraut.space'
+    CLIENT_CERT = './certs/client.crt'
+    CLIENT_KEY = './certs/client.key'
+    SERVER_CERT = './certs/server.crt'
     BOM = byteorder
     STATUS = None
     RESPONSE = None
@@ -69,21 +74,35 @@ def main(*status):
             if STATUS == None:
                 STATUS = read_argument()
 
+    context = ssl.create_default_context(ssl.Purpose.SERVER_AUTH, cafile = SERVER_CERT)
+    context.options &= ~ssl.PROTOCOL_TLS
+    context.verify_mode = ssl.CERT_OPTIONAL
+    # context.set_ciphers('HIGHT:!aNULL:!RC4:!DSS')
+    context.load_cert_chain(certfile = CLIENT_CERT, keyfile = CLIENT_KEY)
+    print('SSL context created')
+
     with socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) as mySocket:
         print('Socket created')
         try:
-            mySocket.connect((HOST, PORT))
+            conn = context.wrap_socket(mySocket, server_side = False, \
+                                      server_hostname = SERVER_NAME)
+            print('Connection wrapped with ssl.context')
         except Exception as e:
-            print('{}'.format(e))
+            print('Context wrapper failed: [}'.format(e))
+        try:
+            conn.connect((HOST, PORT))
+            print('SSL established: {}'.format(conn.getpeercert()))
+        except Exception as e:
+            print('SSL handshake failed: {}'.format(e))
             exit(1)
         try:
             print('Send new status: {}'.format(STATUS))
-            mySocket.send(STATUS)
+            conn.send(STATUS)
         except Exception as e:
             print('Error: {}'.format(e))
             exit(2)
         try:
-            RESPONSE = mySocket.recv(1)
+            RESPONSE = conn.recv(1)
             print('Server returns: {}'.format(RESPONSE))
             if RESPONSE == STATUS:
                 print('Status sucessfull updated')