commit ac16c46e0120e36b7c1793ab5af46c28a335b087
Author: Stefan Krulj <s.krulj@tricentis.com>
Date:   Sun Aug 11 12:13:11 2019 +0200

    First commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bee8a64
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+__pycache__
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/model/models.py b/model/models.py
new file mode 100644
index 0000000..c3ec4fd
--- /dev/null
+++ b/model/models.py
@@ -0,0 +1,27 @@
+from datetime import datetime,timedelta
+from uuid import uuid1
+import secrets
+
+class Nounce(object):
+    def __init__(self):
+        self.id = uuid1()
+        self.expiration = datetime.now()+timedelta(seconds=60)
+        self.token = secrets.token_urlsafe()
+
+    def expired(self):
+        return datetime.now() > self.expiration
+
+    def bump(self):
+        self.expiration = datetime.now()+timedelta(seconds=60)
+
+class AuthSession(object):
+    def __init__(self, username):
+        self.id = uuid1()
+        self.expiration = datetime.now()+timedelta(minutes=30)
+        self.username = username
+
+    def expired(self):
+        return datetime.now() > self.expiration
+
+    def bumpExpiration(self):
+        self.expiration = datetime.now()+timedelta(minutes=30)
\ No newline at end of file
diff --git a/nonce.py b/nonce.py
new file mode 100644
index 0000000..3f3062f
--- /dev/null
+++ b/nonce.py
@@ -0,0 +1,109 @@
+from flask import *
+import secrets, hashlib
+from model.models import *
+import json
+
+app = Blueprint('nounce', __name__)
+
+SID = 'SID'
+nonces = {}
+authSessions = {}
+users = {}
+
+def loadUsers(path):
+    global users
+    with open(path) as json_file:
+        users = json.load(json_file)
+
+@app.route('/nonce', methods=['GET'])
+def nounce():
+    n = tryGetSessionNonce()
+    if n == None or n.expired():
+        n = generateSessionNonce()
+    n.bump()
+    return jsonify(n.__dict__),201
+
+@app.route('/login', methods=['POST'])
+def login():    
+    if isLoggedIn():
+        return 'already logged in', 400
+
+    n = tryGetSessionNonce()
+    if n == None:
+        return 'no nonce was generated', 400
+    if n.expired():
+        clearSessionNonce()
+        return 'nonce expired', 408
+    
+    user = request.form['user']
+    cnonce = request.form['cnonce']
+    pwdhash = request.form['pwdhash']
+
+    pwdHashed_sha256 = ''
+    if user in users:
+        pwdHashed_sha256 = users[user]
+    else:
+        abort(403)
+
+    hash = generateHash(pwdHashed_sha256, cnonce, n.token)
+    if hash == pwdhash:
+        s = generateAuthSession(user)
+        return jsonify(s.__dict__),201
+    else:
+        abort(403)
+
+@app.route('/check-login', methods=['GET'])
+def checkLogin():
+    if isLoggedIn():
+        asession = authSessions[session[SID]]
+        asession.bumpExpiration()
+        return jsonify(asession.__dict__)
+    else:
+        return abort(403)
+
+@app.route('/login-page', methods=['GET'])
+def loginPage():
+    return render_template('login-page.html')
+
+def isLoggedIn():
+    if SID in session and session[SID] in authSessions:
+        return not(authSessions[session[SID]].expired())
+    return False
+    
+def generateAuthSession(username):
+    asession = AuthSession(username)
+    authSessions[session[SID]] = asession
+    return asession
+
+def getAuthSession():
+    if not SID in session:
+        return None
+    if not session[SID]:
+        return None
+    return authSessions[session[SID]]
+
+def clearSessionNonce():
+    if not SID in session:
+        return
+    if not session[SID] in nonces:
+        return
+    del nonces[session[SID]]
+
+def tryGetSessionNonce():
+    if not SID in session:
+        return None
+    if not session[SID] in nonces:
+        return None
+    return nonces[session[SID]]
+
+def generateSessionNonce():
+    n = Nounce()
+    session[SID] = secrets.token_urlsafe()
+    nonces[session[SID]] = n
+    return n
+
+def generateHash(pwdsha256,cnonce,nonce):
+    all = pwdsha256+cnonce+nonce
+    sha256 = hashlib.sha256( )
+    sha256.update( all.encode('utf8') )
+    return sha256.hexdigest()
diff --git a/simple_auth_service.py b/simple_auth_service.py
new file mode 100644
index 0000000..b303c5f
--- /dev/null
+++ b/simple_auth_service.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+from flask import *
+import secrets
+import nonce
+import os.path
+
+app = Flask(__name__)
+app.secret_key = secrets.token_urlsafe()
+app.register_blueprint(nonce.app)
+
+ROUTES = {'routes': ['/', '/nonce'] }
+@app.route('/')
+def home():
+    return jsonify(ROUTES)
+
+nonce.loadUsers( os.path.join('data','userlist.json') )
+if __name__ == '__main__':
+    app.run( host='0.0.0.0', port=7070)
+
diff --git a/templates/login-page.html b/templates/login-page.html
new file mode 100644
index 0000000..da2e7ae
--- /dev/null
+++ b/templates/login-page.html
@@ -0,0 +1,179 @@
+<!doctype html>
+<html>
+<head>
+    <script
+        src="https://code.jquery.com/jquery-3.4.1.min.js"
+        integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
+        crossorigin="anonymous"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/jsSHA/2.3.1/sha256.js" 
+        integrity="sha384-rxrcz1OyCVG21aEKlNBwgap2/r4pSV/RrN6eEMQhLriiTZnnzhCFZr+ZKGPJNSJX"
+         crossorigin="anonymous"></script>
+        
+    <script>
+
+function generateCnonce() {
+    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+    var text = "";
+    for(var i = 0; i < 43; i++) {
+        text += possible.charAt(Math.floor(Math.random() * possible.length));
+    }
+    return text;
+}
+
+function submit() {
+    var user = $("#user").val();
+    var pwd = $("#pwd").val();
+    jQuery.get( 'nonce', {}, function(data){
+        var nonce = data.token;
+        var cnonce = generateCnonce();
+
+        var sha256 = new jsSHA('SHA-256', 'TEXT'); //B64
+        sha256.update(pwd);
+        var pwdHashed_sha256 = sha256.getHash('HEX')
+
+        sha256 = new jsSHA('SHA-256', 'TEXT');
+        sha256.update( pwdHashed_sha256+cnonce+nonce );
+        const pwdhash= sha256.getHash('HEX')
+        const payload = {
+                user: user,
+                cnonce: cnonce,
+                pwdhash: pwdhash
+            }
+        jQuery.post('login', payload,
+            function(data){
+                location.href = '/';
+            }
+            ).fail(function() {
+                var el = $('.error_msg');
+                el.css('animation-name','');
+                void el[0].offsetWidth; //trigger reflow
+                el.css('animation-name','fade');
+            });
+    } );
+}
+
+$( document ).ready(function() {
+    $("body").keypress( function(e) {
+        if(e.key=='Enter') {
+            submit();
+        }
+    });
+    $("#login").click( submit );
+});
+    </script>
+    <style>
+input {
+    border: 1px solid lightgray;
+    border-radius: 5px;
+    padding: 5px 5px 5px 5px;
+    /*width: 150px;*/
+    width:100%;
+    display: block;
+    margin: 1px auto 3px auto;
+    box-sizing: border-box;
+}
+
+button {
+    border: none;
+    border-radius: 5px;
+    padding: 5px 5px 5px 5px;
+    /*width: 150px;*/
+    width:100%;
+    display: block;
+    margin: 1px auto 3px auto;
+    box-shadow: 0px 1px 3px 0px rgba(0,0,0,0.75);
+    cursor: pointer;
+}
+
+button:hover {
+    background-color: lightgray;
+}
+
+button:active {
+    transform: translateY(1px);
+    box-shadow: 0px 1px 2px 0px rgba(0,0,0,0.75);
+}
+
+button:focus {
+    outline: 0;
+}
+
+.error_msg {
+    border: none;
+    border-radius: 5px;
+    display: block;
+    background-color: #CC3333;
+    color: white;
+    animation-duration: 2.5s;
+    opacity: 0;
+    padding: 5px;
+    width:100%;
+    box-sizing: border-box;
+    font: 400 13.3333px Arial;
+    font-weight: 600;
+    text-align: center;
+    margin: 1px auto 3px auto;
+}
+
+@keyframes fade {
+  0%   {opacity: 1;}
+  25%   {opacity: 1;}
+  100% {opacity: 0;}
+}
+
+.centered {
+    width:  180px;
+    margin: 0;
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+}
+
+body {
+  background:
+    linear-gradient(27deg, 
+      #151515 5px, 
+      transparent 5px
+    ) 0 5px,
+    linear-gradient(207deg, 
+      #151515 5px, 
+      transparent 5px
+    ) 10px 0px,
+    linear-gradient(27deg, 
+      #222 5px, 
+      transparent 5px
+    ) 0px 10px,
+    linear-gradient(207deg, 
+      #222 5px, 
+      transparent 5px
+    ) 10px 5px,
+    linear-gradient(90deg, 
+      #1b1b1b 10px, 
+      transparent 10px
+    ),
+    linear-gradient(
+      #1d1d1d 25%, 
+      #1a1a1a 25%, 
+      #1a1a1a 50%, 
+      transparent 50%, 
+      transparent 75%, 
+      #242424 75%, 
+      #242424
+    );
+  background-color: #131313;
+  background-size: 20px 20px;
+  background-clip: content-box;
+}
+
+    </style>
+</head>
+<body>
+<div class="centered">
+    <input id="user" type="text" />
+    <input id="pwd" type="password" />
+    <button id="login">Login</button>
+    <div class="error_msg">Login failed!</div>
+</div>
+</body>
+</html>
\ No newline at end of file