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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/client/client.py b/client/client.py
new file mode 100755
index 0000000..abbc9de
--- /dev/null
+++ b/client/client.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+
+import socket
+import time
+import argparse
+import sys
+
+HEADER_LENGTH = 64
+KEY_LENGTH = 64
+DISCONNECT_LENGTH = ACK_LENGTH = 3
+ACK_MESSAGE = "ACK"
+DISCONNECT_MESSAGE = "BYE"
+FORMAT = "utf-8"
+
+def parse_arguments():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--server",type=str,help="IP of MFA Server",required=True)
+    parser.add_argument("--port",type=int,help="Port to connect to",required=True)
+    parser.add_argument("--key",type=str,help="Client connection key",required=True)
+    return parser.parse_args()
+
+def prompt_user(prompt):
+    # Prompt user for input and return input
+    print(prompt)
+    result = input("> ")
+    return result
+
+
+def init_connection(mfa_server, client_port, client_key):
+    # Attempts to connect to MFA server with provided address,port, and key.
+    # Repeats attempt once a seconds until timeout is reached.
+    # Returns socket or None if unable to connect
+    connection = None
+    timeout = 0
+    timeout_length = 5
+    sleep_length = 1
+    while connection == None and timeout < timeout_length:
+        try:
+            connection = socket.create_connection((mfa_server,client_port))
+            connection.send(client_key.encode(FORMAT))
+            response = connection.recv(ACK_LENGTH).decode(FORMAT)
+            if response == ACK_MESSAGE:
+                print("connected to mfa server")
+            elif response == DISCONNECT_MESSAGE:
+                print("server terminated connection")
+                sys.exit(1)
+        except ConnectionError:
+            time.sleep(sleep_length)
+            timeout += sleep_length
+    return connection
+
+
+def main():
+    # Get arguments, exit if unable to connect
+    args = parse_arguments()
+    mfa_server = args.server
+    client_port = args.port
+    client_key = args.key
+
+    # Exit if invalid key is provided
+    if len(client_key) != KEY_LENGTH:
+        print("invalid key")
+        sys.exit(1)
+
+    # Open connection to server
+    conn = init_connection(mfa_server,client_port,client_key)
+    if conn == None:
+        print("timed out attempting to connect to server")
+        sys.exit(1)
+
+    # Main loop
+    running = True
+    while running:
+        # Receive MFA prompt from server
+        prompt_len = int(conn.recv(HEADER_LENGTH).decode(FORMAT))
+        prompt = conn.recv(prompt_len).decode(FORMAT)
+        # Ask user for response
+        answer = prompt_user(prompt)
+        # Send answer to MFA server
+        answer_length = len(answer)
+        length_msg = str(answer_length)
+        length_msg += ' ' * (HEADER_LENGTH - len(length_msg))
+        conn.send(length_msg.encode(FORMAT))
+        conn.send(answer.encode(FORMAT))
+
+
+
+
+if __name__ == '__main__':
+    main()
diff --git a/pam/pam.py b/pam/pam.py
new file mode 100755
index 0000000..28450ee
--- /dev/null
+++ b/pam/pam.py
@@ -0,0 +1,100 @@
+#!/usr/bin/python3
+import socket
+import argparse
+import time
+import sys
+
+# Sends authentication request to MFA server
+# Receive either pass or fail response from MFA server
+# Returns status to PAM
+
+HEADER_LENGTH = 64
+KEY_LENGTH = 64
+ACK_LENGTH = 3
+DISCONNECT_MESSAGE = "DISCONNECT"
+FORMAT = "utf-8"
+RESPONSE_LENGTH = 1
+PAM_SUCCESS = 0
+PAM_AUTH_ERR = 7
+
+def parse_arguments():
+    # Parse command line arguments
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--user",type=str,help="PAM username",required=True)
+    parser.add_argument("--service",type=str,help="PAM service",required=True)
+    return parser.parse_args()
+
+def init_connection(mfa_server, pam_port):
+    # Attempts to connect to MFA server with provided address and port
+    # Repeats connection attempts once per second until timeout is reached
+    # Returns the socket if connection was successful or None otherwise
+    connection = None
+    timeout = 0
+    timeout_length = 5
+    sleep_length = 1
+    while connection == None and timeout < timeout_length:
+        try:
+            connection = socket.create_connection((mfa_server,pam_port))
+            print("connected to mfa server")
+            return connection
+        except (ConnectionError,ConnectionRefusedError):
+            time.sleep(sleep_length)
+            timeout += sleep_length
+    return None
+
+
+def read_config(config_file="/etc/mfa/mfa.conf"):
+    # Read config file for server and port info
+    # Return tuple (server,port)
+    server = ""
+    port = 0
+    with open(config_file) as conf:
+        line = None
+        while line != "":
+            line = conf.readline()
+            if line.startswith("server ="):
+                server = line.split("=")[1].strip()
+            if line.startswith("port ="):
+                port = int(line.split("=")[1].strip())
+    return (server,port)
+
+def main():
+    authed = "0"
+    failed = "1"
+
+    # Get arguments
+    args = parse_arguments()
+    user = args.user
+    service = args.service
+
+    # Compile data to send to server
+    mfa_server, pam_port = read_config()
+    hostname = None
+    with open("/etc/hostname") as f:
+        hostname = f.read().strip()
+    data = user + "," + hostname + "," + service 
+    
+
+    # Initalize connection to MFA server.  Quit if unable to connect.
+    connection = init_connection(mfa_server,pam_port)
+    if connection == None:
+        print(failed)
+        sys.exit(1)
+
+    # Send authentication data to MFA server
+    data_length = len(data)
+    length_msg = str(data_length)
+    length_msg += ' ' * (HEADER_LENGTH - len(length_msg))
+    connection.send(length_msg.encode(FORMAT))
+    connection.send(data.encode(FORMAT))
+
+    # Listen for response from MFA server
+    # Response will be 0 for authenticated and 1 for denied
+    response = int(connection.recv(RESPONSE_LENGTH).decode(FORMAT))
+
+    # Print success/failure for PAM module
+    print(str(response))
+
+if __name__ == '__main__':
+    main()
+
diff --git a/pam/pam_mfa.c b/pam/pam_mfa.c
new file mode 100644
index 0000000..7e71856
--- /dev/null
+++ b/pam/pam_mfa.c
@@ -0,0 +1,60 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <pwd.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <syslog.h>
+
+#include <security/pam_modutil.h>
+#include <security/pam_modules.h>
+#include <security/pam_ext.h>
+
+#define PAMPY "python3 /usr/bin/openmfa/pam/pam.py"
+
+int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char** argv) {
+        int retval;
+        const char *user = NULL;
+        const char *service;
+        FILE *fp;
+
+        // Get user and service
+        pam_get_item(pamh, PAM_SERVICE, (const void **) &service);
+        pam_get_user(pamh, &user, NULL);
+
+        // Build command line
+        int cmdsize = 256;
+        char cmd[cmdsize];
+        cmd[0] = '\0';
+        strcat(cmd, PAMPY);
+        strcat(cmd," --user ");
+        strcat(cmd,user);
+        strcat(cmd," --service ");
+        strcat(cmd,service);
+        pam_syslog(pamh,LOG_INFO,cmd);
+
+        // Execute pam.py
+        if ((fp = popen(cmd,"r")) == NULL) {
+                pam_syslog(pamh,LOG_ERR,"Error opening pipe");
+                return PAM_AUTH_ERR;
+        }
+
+        // Get output and return authentication status
+        int size = 32;
+        char result[size];
+        fgets(result,size,fp);
+        pam_syslog(pamh,LOG_INFO,result);
+        pclose(fp);
+        if (atoi(result) == 0) {
+                pam_syslog(pamh,LOG_INFO,"auth success");
+                return PAM_SUCCESS;
+        } else {
+                pam_syslog(pamh,LOG_ERR,"auth error");
+                return PAM_AUTH_ERR;
+        }
+}
+
+int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char** argv) {
+        return PAM_IGNORE;
+}
diff --git a/server/mfac.py b/server/mfac.py
new file mode 100755
index 0000000..779fa44
--- /dev/null
+++ b/server/mfac.py
@@ -0,0 +1,113 @@
+#!/usr/bin/env python3
+
+import argparse
+import sqlite3
+import pyotp
+import sys
+
+DB_NAME = "mfa.db"
+KEY_LENGTH = 64
+
+def die(msg):
+    print(msg)
+    sys.exit(1)
+
+def parse_arguments():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--add-client",action="store_true",help="Add a client")
+    parser.add_argument("--alias",type=str,help="Alias for new client")
+
+    parser.add_argument("--add-app",action="store_true",help="Add an application")
+    parser.add_argument("--user",type=str,help="Application username")
+    parser.add_argument("--host",type=str,help="Application hostname")
+    parser.add_argument("--service",type=str,help="Application service name")
+    parser.add_argument("--methods",type=str,nargs="+",help="Allowed MFA methods")
+
+    parser.add_argument("--get-client",action="store_true",help="Get a client key")
+
+    return parser.parse_args()
+
+
+def alias_exists(alias):
+    conn = sqlite3.connect(DB_NAME)
+    c = conn.cursor()
+    c.execute("SELECT * FROM clients WHERE alias=?",(alias,))
+    client = c.fetchall()
+    conn.close()
+    if len(client) == 0:
+        return False
+    elif len(client) == 1:
+        return True
+
+
+def get_client_key(alias):
+    CLIENT_ALIAS_INDEX = 0
+    CLIENT_KEY_INDEX = 1
+    if not alias_exists(alias):
+        die("Error: alias does not exist")
+    else:
+        conn = sqlite3.connect(DB_NAME)
+        c = conn.cursor()
+        c.execute("SELECT * FROM clients WHERE alias=?",(alias,))
+        client = c.fetchone()
+        conn.close()
+        return str(client[CLIENT_KEY_INDEX])
+
+
+def add_client(alias):
+    if not alias_exists(alias):
+        key = pyotp.random_base32(length=64)
+        conn = sqlite3.connect(DB_NAME)
+        c = conn.cursor()
+        c.execute("INSERT INTO clients VALUES (?,?)",(alias,key))
+        conn.commit()
+        conn.close()
+        print("key: " + key)
+    else:
+        die("Error: alias already used")
+
+
+def add_app(username, hostname, service, alias, mfa_methods):
+    if not alias_exists(alias):
+        die("Error: alias does not exist")
+    else:
+        client_key = get_client_key(alias)
+        conn = sqlite3.connect(DB_NAME)
+        c = conn.cursor()
+        c.execute("INSERT INTO applications VALUES (?,?,?,?,?)",
+                (username,hostname,service,alias,mfa_methods))
+        conn.commit()
+        conn.close()
+
+
+def main():
+    args = parse_arguments()
+    # Sanity checks
+    if (args.add_client and args.add_app) or (args.add_client and args.get_client) \
+            or (args.get_client and args.add_app):
+        die("Error: cannot specify multiple actions")
+    if args.add_client and args.alias == None:
+        die("Error: must specify alias to provision a client")
+    if args.get_client and args.alias == None:
+        die("Error: no alias specified")
+    if args.add_app and (args.user == None or args.host == None or \
+                         args.service == None or args.alias == None \
+                         or args.methods == None):
+        die("Error: --add-app requires all of --user,--host,--service,--alias,--methods")
+        
+    if args.add_client:
+        add_client(args.alias)
+    elif args.get_client:
+        key = get_client_key(args.alias)
+        print(key)
+    elif args.add_app:
+        methods = " ".join(args.methods)
+        add_app(args.user,args.host,args.service,args.alias,methods)
+        
+        
+
+
+if __name__ == '__main__':
+    main()
+
+
diff --git a/server/mfad.py b/server/mfad.py
new file mode 100755
index 0000000..7a2fc40
--- /dev/null
+++ b/server/mfad.py
@@ -0,0 +1,246 @@
+#!/usr/bin/env python3
+import socket
+import os
+import sys
+import time
+import threading
+import pyotp
+import sqlite3
+import re
+
+## Listens for authentication request from PAM module
+## Recevies connection from client
+## Correlates authentication request to client connection
+## Sends MFA prompt to client 
+## Evaluates response from client
+## Return pass or fail response to PAM moudle
+
+
+DB_NAME = "mfa.db"
+HEADER_LENGTH = 64
+KEY_LENGTH = 64
+DISCONNECT_LENGTH = ACK_LENGTH = 3
+ACK_MESSAGE = "ACK"
+DISCONNECT_MESSAGE = "BYE"
+FORMAT = "utf-8"
+AUTHED = 0
+DENIED = 1
+
+# Stores connected clients as a dictionary with the client key as the dictionary 
+# key and a tuple of (socket,(addr,port)) as the value
+client_connections = dict()
+
+
+def eval_mfa(mfa_methods,client_response):
+    # Evaluates MFA and decides if authenticated or denied
+    # Returns 0 for authenticated on 1 for denied
+    if "push" in mfa_methods and client_response == "allow":
+        return AUTHED
+    elif "totp" in mfa_methods and len(client_response) == 6:
+        # Only attempt to validate if response is a valid TOTP format
+        totp_format = (r'(\d)(\d)(\d)(\d)(\d)(\d)')
+        totp_regex = re.compile(totp_format)
+        matched = totp_regex.match(client_response)
+        if matched:
+            return validate_totp(int(client_response))
+    return DENIED
+
+
+def validate_totp(client_response):
+    pass
+
+
+################################################################################
+
+# Client is registered by admin with secret key stored on server
+# Client is provisioned with secret key and passes secret key to server on
+# connection for identification
+# Client key is used to identify client throughout communication process
+
+# //TODO RSA public/private key pairs for proper authentication
+
+def get_client_key(username,hostname,service):
+    # Correlates a PAM request to a registered client
+    # This is done by checking the PAM request against a preconfigured 
+    # database mapping request info (username,hostname,etc...) to clients
+    # Returns a tuple consisting of the key and approved MFA methods
+    DB_USERNAME_INDEX = 0
+    DB_HOSTNAME_INDEX = 1
+    DB_SERVICE_INDEX = 2
+    DB_ALIAS_INDEX = 3
+    DB_MFAMETHODS_INDEX = 4
+
+    CLIENT_ALIAS_INDEX = 0
+    CLIENT_KEY_INDEX = 1
+
+    conn = sqlite3.connect(DB_NAME)
+    c = conn.cursor()
+    c.execute("""SELECT * FROM applications WHERE username=? AND hostname=?
+                 AND service=?""",(username,hostname,service))
+    application = c.fetchone()
+    # Return None if no results found
+    if application == None:
+        return application
+
+    alias = application[DB_ALIAS_INDEX]
+    c.execute("SELECT * FROM clients WHERE alias=?",(alias,))
+    client = c.fetchone()
+    conn.close()
+    client_key = client[CLIENT_KEY_INDEX]
+    methods = application[DB_MFAMETHODS_INDEX]
+    return (client_key,methods)
+    
+
+
+def prompt_client(client_key, user, host, service, methods, timeout=10):
+    # Prompts client for MFA
+    timer = 0
+    while timer < timeout:
+        if client_key in client_connections.keys():
+            conn = client_connections[client_key][0]
+            # Use try block to catch cases where client was connected and so 
+            # is in list but is not currently connected
+            try:
+                # send prompts 
+                methodstr = ", ".join(methods)
+                methodstr = "Available methods: " + methodstr
+                prompt_msg = "Login approved for user '" + user + \
+                             "' attempting to access service '" + service + \
+                             "' on host '" + host + "'?\n" + methodstr
+                prompt_len = len(prompt_msg)
+                length_msg = str(prompt_len)
+                length_msg += ' ' * (HEADER_LENGTH - len(length_msg))
+                conn.send(length_msg.encode(FORMAT))
+                conn.send(prompt_msg.encode(FORMAT))
+                # receive response
+                response_length = int(conn.recv(HEADER_LENGTH).decode(FORMAT))
+                response = conn.recv(response_length).decode(FORMAT)
+                return response
+            except BrokenPipeError:
+                client_connections.pop(client_key)
+                timer += 1
+                time.sleep(1)
+        else:
+            timer +=1 
+            time.sleep(1)
+
+    return 0
+
+
+def validate_client(client_key):
+    # Validates a client
+    conn = sqlite3.connect(DB_NAME)
+    c = conn.cursor()
+    c.execute("SELECT * FROM clients WHERE key=?",(client_key,))
+    client = c.fetchall()
+    conn.close()
+    if len(client) == 0:
+        # No client matches provided key, invalid
+        return False
+    elif len(client) == 1:
+        return True
+    else:
+        print("A strange error has occurred")
+        return False
+    
+    
+
+def handle_client(conn, addr):
+    # Receive key from client
+    key = conn.recv(KEY_LENGTH).decode(FORMAT)
+    # Validate client
+    if not validate_client(key):
+        print("WARNING: client attempted to connect with invalid key")
+        conn.send(DISCONNECT_MESSAGE.encode(FORMAT))
+        conn.close()
+    else:
+        conn.send(ACK_MESSAGE.encode(FORMAT))
+        client_connections[key] = (conn,addr)
+        print("client connected with key " + key)
+
+
+def parse_pam_data(data):
+    # Parses pam data and returns (user,host,service) tuple
+    return tuple(data.split(','))
+
+def handle_pam(conn, addr):
+    # Get request and data from PAM module
+    data_length = int(conn.recv(HEADER_LENGTH).decode(FORMAT))
+    pam_data = conn.recv(data_length).decode(FORMAT)
+    print("Got pam_data: " + pam_data)
+    user,host,service = parse_pam_data(pam_data)
+
+    # Correlate request to client
+    client_key,mfa_methods = get_client_key(user,host,service)
+    mfa_methods = mfa_methods.split(',')
+    if client_key == None:
+        print("No applications found for user="+user+" host="+host+" service="+service)
+        conn.send(str(DENIED).encode(FORMAT))
+        return
+
+    # Prompt client
+    response = prompt_client(client_key,user,host,service,mfa_methods)
+
+    # Evaluate Response
+    auth_type = "push"
+    decision = eval_mfa(auth_type, response)
+
+    # Return response to PAM module
+    # Respone will either be 0 for authenticated and 1 for denied
+    conn.send(str(decision).encode(FORMAT))
+
+
+def listen_client(addr, port):
+    with socket.create_server((addr, port)) as server:
+        while True:
+            conn, addr = server.accept()
+            thread = threading.Thread(target=handle_client,args=(conn,addr))
+            thread.start()
+
+
+def listen_pam(addr, port):
+    with socket.create_server((addr,port)) as pam_server:
+        while True:
+            conn, addr = pam_server.accept()
+            thread = threading.Thread(target=handle_pam,args=(conn,addr))
+            thread.start()
+
+
+################################################################################
+
+def create_db():
+    conn = sqlite3.connect(DB_NAME)
+    c = conn.cursor()
+    c.execute("""CREATE TABLE applications (
+                username text,
+                hostname text,
+                service text,
+                client_key text,
+                mfa_methods text
+            )""")
+    conn.commit()
+    c.execute("""CREATE TABLE clients (
+                alias,
+                key
+             )""")
+    conn.commit()
+    conn.close()
+
+
+def main():
+    global connection_list
+    bind_addr = "127.0.0.1"
+    pam_port = 8000
+    client_port = 8001
+
+    if not os.path.exists(DB_NAME):
+        create_db()
+
+    clients = threading.Thread(target=listen_client,args=(bind_addr,client_port))
+    pam = threading.Thread(target=listen_pam,args=(bind_addr,pam_port))
+    clients.start()
+    pam.start()
+
+
+if __name__ == '__main__':
+    main()