Mutual ssl authentication in simple ECHO client/server [Python / sockets / ssl modules], ssl.SSLEOFError: EOF occurred in violation of protocol

user_1582481 0
Viewed 16858

I would like to have a mutual authentication in my echo client/server program. I'm using python 2.7.12 and thessl` module on 

Distributor ID: Ubuntu
Description:    Ubuntu 14.04.5 LTS
Release:        14.04
Codename:       trusty

I've generated client's and server's certificates and keys using the openssl commands:

openssl req -new -x509 -days 365 -nodes -out client.pem -keyout client.key
openssl req -new -x509 -days 365 -nodes -out server.pem -keyout server.key

I want the client to authenticate the server, and I want the server to authenticate the client. However, the code below shows some errors, at server's side:

Traceback (most recent call last):
  File "ssl_server.py", line 18, in <module>
    secure_sock = ssl.wrap_socket(client, server_side=True, certfile="server.pem", keyfile="server.key")
  File "/usr/lib/python2.7/ssl.py", line 933, in wrap_socket
    ciphers=ciphers)
  File "/usr/lib/python2.7/ssl.py", line 601, in __init__
    self.do_handshake()
  File "/usr/lib/python2.7/ssl.py", line 830, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLEOFError: EOF occurred in violation of protocol (_ssl.c:590)

At client' side:

Traceback (most recent call last):
  File "ssl_client.py", line 18, in <module>
    secure_sock = context.wrap_socket(sock, server_hostname=HOST, server_side=False, certfile="client.pem", keyfile="client.key")
TypeError: wrap_socket() got an unexpected keyword argument 'certfile'

Server's code:

#!/bin/usr/env python
import socket
import ssl
import pprint

#server
if __name__ == '__main__':

    HOST = '127.0.0.1'
    PORT = 1234

    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server_socket.bind((HOST, PORT))
    server_socket.listen(10)

    client, fromaddr = server_socket.accept()
    secure_sock = ssl.wrap_socket(client, server_side=True, certfile="server.pem", keyfile="server.key")

    print repr(secure_sock.getpeername())
    print secure_sock.cipher()
    print pprint.pformat(secure_sock.getpeercert())
    cert = secure_sock.getpeercert()
    print cert

    # verify client
    if not cert or ('commonName', 'test') not in cert['subject'][4]: raise Exception("ERROR")

    try:
        data = secure_sock.read(1024)
        secure_sock.write(data)
    finally:
        secure_sock.close()
        server_socket.close()

Client's code:

import socket
import ssl

# client
if __name__ == '__main__':

    HOST = '127.0.0.1'
    PORT = 1234

    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect((HOST, PORT))

    context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
    context.verify_mode = ssl.CERT_REQUIRED
    context.load_verify_locations('server.pem')

    if ssl.HAS_SNI:
        secure_sock = context.wrap_socket(sock, server_hostname=HOST, server_side=False, certfile="client.pem", keyfile="client.key")
    else:
        secure_sock = context.wrap_socket(sock, server_side=False, certfile="client.pem", keyfile="client.key")

    cert = secure_sock.getpeercert()
    print cert

    # verify server
    if not cert or ('commonName', 'test') not in cert['subject'][4]: raise Exception("ERROR")

    secure_sock.write('hello')
    secure_sock.read(1024)

    secure_sock.close()
    sock.close()

Thank you.

pyopenssl ssl authentication python
2 Answers

ilario-pierbattista Answer but in python 3:

  • Check print function
  • Check secure_sock.write(b'hello') in bytes
  • Check function argument (config)
def start_client_side(config):
    HOST = config['host']
    PORT = config['port']
    pemServer = config['serverpem']
    keyClient = config['clientkey']
    pemClient = config['clientpem']

    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setblocking(1);
    sock.connect((HOST, PORT))

    context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
    context.verify_mode = ssl.CERT_REQUIRED
    context.load_verify_locations(pemServer)
    context.load_cert_chain(certfile=pemClient, keyfile=keyClient)

    if ssl.HAS_SNI:
        secure_sock = context.wrap_socket(sock, server_side=False, server_hostname=HOST)
    else:
        secure_sock = context.wrap_socket(sock, server_side=False)

    cert = secure_sock.getpeercert()
    print(pprint.pformat(cert))

    # verify server
    if not cert or ('commonName', 'server.utester.local') not in itertools.chain(*cert['subject']): raise Exception("ERROR")

    secure_sock.write(b'hello')
    print(secure_sock.read(1024))

    secure_sock.close()
    sock.close()


def start_server_side(config):
    HOST = config['host']
    PORT = config['port']
    pemServer = config['serverpem']
    keyServer = config['serverkey']
    pemClient = config['clientpem']

    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server_socket.bind((HOST, PORT))
    server_socket.listen(10)

    client, fromaddr = server_socket.accept()
    secure_sock = ssl.wrap_socket(client, server_side=True, ca_certs=pemClient, certfile=pemServer,
                                  keyfile=keyServer, cert_reqs=ssl.CERT_REQUIRED,
                                  ssl_version=ssl.PROTOCOL_TLSv1_2)

    print(repr(secure_sock.getpeername()))
    print(secure_sock.cipher())
    cert = secure_sock.getpeercert()
    print(pprint.pformat(cert))

    # verify client
    if not cert or ('commonName', 'client.utester.local') not in itertools.chain(*cert['subject']): raise Exception("ERROR")

    try:
        data = secure_sock.read(1024)
        secure_sock.write(data)
    finally:
        secure_sock.close()
        server_socket.close()
user_8773800
Related