OpenVPN test setup for user authentication with challenge response

cr-test-client.conf

# Client config for testing auth-user-pass and CR.
# As a test, the user/pass/reponse is sent back to the client along
# wth the a dynamic challenge question and the connection will succeed if
# the response to dynamic-challenge is correct. 
# Use only for testing.

# For reading usser/pass from a file uncomment next line 
# and create a file named cr-test.txt with 2 lines of some
# username and password. Could be anything, but username
# should not be empty.
# Do not use any secret strings -- these will be returned back
# to the client in clear text. May also get logged on the
# server.

;auth-user-pass "/home/selva/cr-test-up.txt"
auth-user-pass 
auth-retry interact
static-challenge "Type some thing (e.g., hello): "  0
reneg-sec 600

;management localhost 37500
;management-hold

# management query will take effect if authfile is not specified
# and management-query-paswswords is enabled
;management-query-passwords

nice 3
verb 4
mute 10
;log /tmp/cr-test.log
remote myserver 1051

# the rest is standard
client
dev tun
proto udp
resolv-retry infinite
nobind

key-direction 1
explicit-exit-notify 2
ns-cert-type server
# These certificates are probably from the samples in OpenVPN
# distribution. Use only for testing.
<ca>
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
</ca>
<cert>
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
</cert>
<key>
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
</key>
<tls-auth>
-----BEGIN OpenVPN Static key V1-----
a863b1cbdb911ff4ef3360ce135157e7
241a465f5045f51cf9a92ebc24da34fd
5fc48456778c977e374d55a8a7298aef
40d0ab0c60b5e09838510526b73473a0
8da46a8c352572dd86d4a871700a915b
6aaa58a9dac560db2dfdd7ef15a202e1
fca6913d7ee79c678c5798fbf7bd920c
caa7a64720908da7254598b052d07f55
5e31dc5721932cffbdd8965d04107415
46c86823da18b66aab347e4522cc05ff
634968889209c96b1024909cd4ce574c
f829aa9c17d5df4a66043182ee23635d
8cabf5a7ba02345ad94a3aa25a63d55c
e13f4ad235a0825e3fe17f9419baff1c
e73ad1dd652f1e48c7102fe8ee181e54
10a160ae255f63fd01db1f29e6efcb8e
-----END OpenVPN Static key V1-----
</tls-auth>
<dh>
-----BEGIN DH PARAMETERS-----
MIIBCAKCAQEArdnA32xujHPlPI+jPffHSoMUZ+b5gRz1H1Lw9//Gugm5TAsRiYrB
t2BDSsMKvAjyqN+i5SJv4TOk98kRRKB27iPvyXmiL945VaDQl/UehCySjYlGFUjW
9nuo+JwQxeSbw0TLiSYoYJZQ8X1CxPl9mgJl277O4cW1Gc8I/bWa+ipU/4K5wv3h
GI8nt+6A0jN3M/KebotMP101G4k0l0qsY4oRMTmP+z3oAP0qU9NZ1jiuMFVzRlNp
5FdYF7ctrH+tBF+QmyT4SRKSED4wE4oX6gp420NaBhIEQifIj75wlMDtxQlpkN+x
QkjsEbPlaPKHGQ4uupssChVUi8IM2yq5EwIBAg==
-----END DH PARAMETERS-----
</dh>

cr-test-server.conf

# server config for testing auth-user-pass and CR

management .cr-test-man unix
username-as-common-name
management-client-auth

nice 3
verb 4
mute 10
log-append cr-test-server.log

# the rest is standard
server 10.31.43.0 255.255.255.0
dev tun
topology subnet
proto udp
port 1051

persist-tun
persist-key

keepalive 30 120

key-direction 0
<ca>
-----BEGIN CERTIFICATE-----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YpYeyCf5dxoIjweCPOoP426+aTXM7kqq0ieIr6YxnKV6OGGLKEY+VNZh1DS7enqV
HP5i8eimyuUYPoQhbK9xtDGMgghnc6Hn8BldPMcvz98HdTEH4rBfA3yNuCxLSNow
4jJuLjNXh2QeiUtWtkXja7ec+P7VqKTduJoRaX7cs+8E3ImigiRnvmK+npk7Nt1y
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rvrq0JbzpwoYedMh84sJ2qI/DGKW9/Is9+O52fR+3z3dY3gNRDPQ5675BQ5CQW9I
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kX/j/y5KGux5HZ3lxXqdJbKcAq4NKYQT0mCkRD4l6szaCEJ+k0SiM9DdTcBDefhR
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hEi44aHbPXt9opdssz/hdGfd8Wo7vEJrbg7c6zR6C/Akav1Rzy9oohIdgOw=
-----END CERTIFICATE-----
</ca>
<cert>
-----BEGIN CERTIFICATE-----
MIIFgDCCA2igAwIBAgIBATANBgkqhkiG9w0BAQsFADBmMQswCQYDVQQGEwJLRzEL
MAkGA1UECBMCTkExEDAOBgNVBAcTB0JJU0hLRUsxFTATBgNVBAoTDE9wZW5WUE4t
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1amHc7NzNlEvpdCQoodkVGwS07h2R2mvro8As3C552c/jGo9eV+BJ6MOqqc9gUgQ
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WMGA28/QkN/KweZB4Uh/px7HNZ+cbXw+gujefq6CFgAzDwIj8Z3+KwYWBVUWidxj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-----END CERTIFICATE-----
</cert>
<key>
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
</key>
<tls-auth>
-----BEGIN OpenVPN Static key V1-----
a863b1cbdb911ff4ef3360ce135157e7
241a465f5045f51cf9a92ebc24da34fd
5fc48456778c977e374d55a8a7298aef
40d0ab0c60b5e09838510526b73473a0
8da46a8c352572dd86d4a871700a915b
6aaa58a9dac560db2dfdd7ef15a202e1
fca6913d7ee79c678c5798fbf7bd920c
caa7a64720908da7254598b052d07f55
5e31dc5721932cffbdd8965d04107415
46c86823da18b66aab347e4522cc05ff
634968889209c96b1024909cd4ce574c
f829aa9c17d5df4a66043182ee23635d
8cabf5a7ba02345ad94a3aa25a63d55c
e13f4ad235a0825e3fe17f9419baff1c
e73ad1dd652f1e48c7102fe8ee181e54
10a160ae255f63fd01db1f29e6efcb8e
-----END OpenVPN Static key V1-----
</tls-auth>
<dh>
-----BEGIN DH PARAMETERS-----
MIIBCAKCAQEArdnA32xujHPlPI+jPffHSoMUZ+b5gRz1H1Lw9//Gugm5TAsRiYrB
t2BDSsMKvAjyqN+i5SJv4TOk98kRRKB27iPvyXmiL945VaDQl/UehCySjYlGFUjW
9nuo+JwQxeSbw0TLiSYoYJZQ8X1CxPl9mgJl277O4cW1Gc8I/bWa+ipU/4K5wv3h
GI8nt+6A0jN3M/KebotMP101G4k0l0qsY4oRMTmP+z3oAP0qU9NZ1jiuMFVzRlNp
5FdYF7ctrH+tBF+QmyT4SRKSED4wE4oX6gp420NaBhIEQifIj75wlMDtxQlpkN+x
QkjsEbPlaPKHGQ4uupssChVUi8IM2yq5EwIBAg==
-----END DH PARAMETERS-----
</dh>

CR-verify.py

#!/usr/bin/env python

#
# cr-verify: A test script to do OpenVPN client authentication
#            through the management interface
# This should be started from the same directory as the server
# (or edit the path of unix socket) and left running along with
# the server for management-client-auth.
# This is only a testing script, not robust enough for real use.
#
# (c) 2015-2016 Selva Nair <selva.nairATgmail.com> 
# 
import socket
import sys
import time
import base64
import random

#debug   = True
debug   = False

CONNECT = 1
REAUTH  = 2

global_qna = []
global_qna.append(['1+1 = ', '2'])
global_qna.append(['pi to 2 decimal places = ', '3.14'])
global_qna.append(['10-7 = ', '3'])
global_qna.append(['1-2 = ', '-1'])

class Verify(object):
    """OpenVPN client-auth via the management interface"""
  
    def __init__(self, path):
        """Initializes the unix socket for communicating with the server."""
        self.set_defaults()
        self.path = path;
        self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
  
    def set_defaults(self):
        self.new_client = 0
        self.user = ''
        self.saved_user = ''
        self.passwd = '' 
        self.ckid = ("-1","-1")

    def connect(self):
        # Connect to the management interface. Waits if the server is not up
        print 'trying to connect to %s ...' % self.path
        connected = False
        while not connected:
            try:
                self.sock.connect(self.path)
                connected = True
                # use file interface for reading line by line
                self.sfd = self.sock.makefile('r+')
                print 'connected'
            except Exception as e:
                if debug: print(e)
                time.sleep(1)

    def run(self):
        # Parse messages from server and process when a new client connects
        while True:
            self.connect()
            while True:
                try:
                    line = self.sfd.readline()
                except Exception as e:
                    if debug: print(e)
                    break
                if not line: break
                line = line.rstrip()

                if debug: print 'got: %s' % line

                if  not line.startswith(">CLIENT:"): continue
                line = line[8:]
                if not line: continue
                words = line.split(',')
        
                if debug: print 'split into: %s' % ' '.join(words)

                if words[0] == 'CONNECT' and len(words) == 3:
                    self.ckid = words[1:]
                    print 'New client %s %s' % (words[1], words[2])
                    self.new_client = CONNECT
                    self.user = ''
                    self.passwd = ''
                elif words[0] == 'REAUTH' and len(words) == 3:
                    self.ckid = words[1:]
                    print 'New client (reauth) %s %s' % (words[1], words[2])
                    self.new_client = REAUTH 
                    self.user = ''
                    self.passwd = ''
                elif line.startswith('ENV,END') and self.new_client:
                    print 'processing new client'
                    self.process_client()
                elif not self.new_client or not words[0] == 'ENV' or len(words) < 2:
                    continue

                if words[1].startswith('username='):
                    self.user = words[1][9:]
                    if debug: print 'got user = %s' % self.user
                elif words[1].startswith('password='):
                    self.passwd = words[1][9:]
                    if debug: print 'got pass = %s' % self.passwd

            fclose(self.sfd)
            self.sock.close()

    def process_client(self):
        # Verify dynamic challenge response or prompt a new challenge

        reason = 'Password/response is in invalid format'

        j = random.randrange(0, len(global_qna))
        qna = global_qna[j]
        msg = ''

        if debug: print 'Password received from mgmt: %s' % self.passwd

        # Reauth happens during renegotiation. If the client is running with
        # cached credentials renegotiation will fail if full user
        # authentication is performed. Here we just pass the client with no
        # checks in case of reauth.
        
        if self.new_client == REAUTH:
            msg = 'client-auth-nt ' + ' '.join(self.ckid)
            print 'client reauth: allowing without checks'

        elif not self.user:
            reason = 'Empty username'

        # We test static-challenge and dynamic challenge exchanges using one
        # client setup. If a static challenge-response is received we send the
        # response back to the client as a part of the dynamic challenge message 
        # so that the client can check that the response was correctly decoded
        # by the server. We also send the user name and password back.
        # Further, a dynamic challenge is generated and the client is challenged
        # for an answer.

        elif self.passwd.startswith ('SCRV1:') and self.passwd[6:]:
            pr64 = self.passwd[6:].split(':')
            p = ''
            r = ''
            if pr64[0]:
                p = base64.b64decode(pr64[0])
            if len(pr64) == 2 and pr64[1]:
                r = base64.b64decode(pr64[1])
            if not p or not r:
                reason = 'Invalid format'
            else:
                # deny with reason = 
                #  "CRV1:R,E:state:some-data:Welcome user... dynamic challenege"
                # hide the answer and user in the state_id for verification 
                # without needing a database
                state = qna[1] + '|' + self.user
                reason = ('CRV1:R,E:' + state + ':'
                          + base64.b64encode(self.user) + ':'
                          + 'Welcome ' + self.user
                          + ' (passwd/response = ' + p + '/' + r + '), '
                          + 'please answer this: ' + qna[0])

        elif self.passwd.startswith('CRV1::') and self.passwd[6:]:
            # Response to dynamic challenge received.
            # Expect CRV1::state_id::answer
            # The correct answer is embedded in the state_id of the challenge
            # so we just check that it matches response.
            p = self.passwd[6:].split(':')
            if len(p) == 3:
                state_id, unused, recvd = p
                p = state_id.split('|')
                if len(p) == 2:
                    expected_ans, expected_user = p
            else:
                expected_ans, expected_user, recvd = ('','','')

            if debug: 
                print ('expected answer, expected username = %s %s'
                        % (expected_ans, expected_user))

            if unused or not recvd or not expected_ans or not expected_user:
                reason = 'Dynamic respose in invalid format'
            elif recvd != expected_ans:
                reason = 'Wrong response to dynamic response'
            elif self.user != expected_user:
                reason = 'Wrong username with dynamic response'
            else:
                msg = 'client-auth-nt ' + ' '.join(self.ckid)

        # If the client uses simple user-auth permit if username == password !!
        elif self.user == self.passwd:
            msg = 'client-auth-nt ' + ' '.join(self.ckid)
            print 'simple user-auth in use: permit if user == password'
    
        if not msg:
            msg =  ('client-deny '
                    + ' '.join(self.ckid) 
                    + ' reason "' + reason + '"')

        try:
            self.sfd.write(msg + '\r\n')
            self.sfd.flush();
        except Exception as e:
            if debug: print(e)
            return

        print 'replied: %s' % msg
        self.set_defaults()

if __name__ == '__main__':
    v = Verify ('.cr-test-man')
    v.run()