[PATCH v4] [Wok] Bug fix #147: Block authentication request after too many failures

3 Feb 2017

From: Ramon Medeiros <ramonn@linux.vnet.ibm.com>

To prevent brute force attack, creates a mechanism to allow 3 tries
first. After that, a timeout will start and will be added 30 seconds for
each failed try in a row.

Signed-off-by: Ramon Medeiros <ramonn@linux.vnet.ibm.com>
---
Changes:

v4:
Use API.json for input validation

v3:
Improve error handling on login page

v2:
Set timeout by user, ip and session id. This will avoid trouble with
users using the same ip, like NAT. 

 src/wok/API.json         | 25 +++++++++++++++++-
 src/wok/i18n.py          |  5 +++-
 src/wok/root.py          | 69 +++++++++++++++++++++++++++++++++++++++++-------
 ui/js/src/wok.login.js   | 19 ++++++++-----
 ui/pages/i18n.json.tmpl  |  5 +++-
 ui/pages/login.html.tmpl |  6 ++---
 6 files changed, 106 insertions(+), 23 deletions(-)

diff --git a/src/wok/API.json b/src/wok/API.json
index 8965db9..3f7bfd7 100644
--- a/src/wok/API.json
+++ b/src/wok/API.json
@@ -2,5 +2,28 @@
     "$schema": "http://json-schema.org/draft-03/schema#",
     "title": "Wok API",
     "description": "Json schema for Wok API",
-    "type": "object"
+    "type": "object",
+    "properties": {
+        "wokroot_login": {
+            "type": "object",
+            "properties": {
+                "username": {
+                    "description": "Username",
+                    "required": true,
+                    "type": "string",
+                    "minLength": 1,
+                    "error": "WOKAUTH0003E"
+                },
+                "password": {
+                    "description": "Password",
+                    "required": true,
+                    "type": "string",
+                    "minLength": 1,
+                    "error": "WOKAUTH0006E"
+                }
+            },
+            "additionalProperties": false,
+            "error": "WOKAUTH0007E"
+        }
+    }
 }
diff --git a/src/wok/i18n.py b/src/wok/i18n.py
index 935c9c1..5ad5e57 100644
--- a/src/wok/i18n.py
+++ b/src/wok/i18n.py
@@ -40,8 +40,11 @@ messages = {
 
     "WOKAUTH0001E": _("Authentication failed for user '%(username)s'. [Error code: %(code)s]"),
     "WOKAUTH0002E": _("You are not authorized to access Wok. Please, login first."),
-    "WOKAUTH0003E": _("Specify %(item)s to login into Wok."),
+    "WOKAUTH0003E": _("Specify username to login into Wok."),
+    "WOKAUTH0004E": _("You have failed to login in too much attempts. Please, wait for %(seconds)s seconds to try again."),
     "WOKAUTH0005E": _("Invalid LDAP configuration: %(item)s : %(value)s"),
+    "WOKAUTH0006E": _("Specify password to login into Wok."),
+    "WOKAUTH0007E": _("You need to specify username and password to login into Wok."),
 
     "WOKLOG0001E": _("Invalid filter parameter. Filter parameters allowed: %(filters)s"),
     "WOKLOG0002E": _("Creation of log file failed: %(err)s"),
diff --git a/src/wok/root.py b/src/wok/root.py
index 080b7f0..9f6b7b3 100644
--- a/src/wok/root.py
+++ b/src/wok/root.py
@@ -1,7 +1,7 @@
 #
 # Project Wok
 #
-# Copyright IBM Corp, 2015-2016
+# Copyright IBM Corp, 2015-2017
 #
 # Code derived from Project Kimchi
 #
@@ -21,7 +21,9 @@
 
 import cherrypy
 import json
+import re
 import os
+import time
 from distutils.version import LooseVersion
 
 from wok import auth
@@ -30,8 +32,8 @@ from wok.i18n import messages
 from wok.config import paths as wok_paths
 from wok.control import sub_nodes
 from wok.control.base import Resource
-from wok.control.utils import parse_request
-from wok.exception import MissingParameter
+from wok.control.utils import parse_request, validate_params
+from wok.exception import UnauthorizedError, WokException
 from wok.reqlogger import log_request
 
 
@@ -48,7 +50,8 @@ class Root(Resource):
         super(Root, self).__init__(model)
         self._handled_error = ['error_page.400', 'error_page.404',
                                'error_page.405', 'error_page.406',
-                               'error_page.415', 'error_page.500']
+                               'error_page.415', 'error_page.500',
+                               'error_page.403', 'error_page.401']
 
         if not dev_env:
             self._cp_config = dict([(key, self.error_production_handler)
@@ -146,6 +149,7 @@ class WokRoot(Root):
         self.domain = 'wok'
         self.messages = messages
         self.extends = None
+        self.failed_logins = {}
 
         # set user log messages and make sure all parameters are present
         self.log_map = ROOT_REQUESTS
@@ -153,24 +157,71 @@ class WokRoot(Root):
 
     @cherrypy.expose
     def login(self, *args):
+        def _raise_timeout(user_id):
+            length = self.failed_logins[user_ip_sid]["count"]
+            timeout = (length - 3) * 30
+            details = e = UnauthorizedError("WOKAUTH0004E",
+                                            {"seconds": timeout})
+            log_request(code, params, details, method, 403)
+            raise cherrypy.HTTPError(403, e.message)
         details = None
         method = 'POST'
         code = self.getRequestMessage(method, 'login')
 
         try:
             params = parse_request()
+            validate_params(params, self, "login")
             username = params['username']
             password = params['password']
-        except KeyError, item:
-            details = e = MissingParameter('WOKAUTH0003E', {'item': str(item)})
-            log_request(code, params, details, method, 400)
-            raise cherrypy.HTTPError(400, e.message)
+        except WokException, e:
+            details = e
+            status = e.getHttpStatusCode()
+            raise cherrypy.HTTPError(status, e.message)
+
+        # get authentication info
+        remote_ip = cherrypy.request.remote.ip
+        session_id = str(cherrypy.session.originalid)
+        user_ip_sid = re.escape(username + remote_ip + session_id)
+
+        # check for repetly
+        count = self.failed_logins.get(user_ip_sid, {"count": 0}).get("count")
+        if count > 3:
+
+                # verify if timeout is still valid
+                last_try = self.failed_logins[user_ip_sid]["time"]
+                if time.time() < (last_try + ((count - 3) * 30)):
+                    _raise_timeout(user_ip_sid)
+                else:
+                    self.failed_logins.pop(user_ip_sid)
 
         try:
             status = 200
             user_info = auth.login(username, password)
+
+            # user logged sucessfuly: reset counters
+            if self.failed_logins.get(user_ip_sid) != None:
+                self.failed_logins.pop(user_ip_sid)
         except cherrypy.HTTPError, e:
-            status = e.status
+
+            # store time and prevent too much tries
+            if self.failed_logins.get(user_ip_sid) == None:
+                self.failed_logins[user_ip_sid] = {"time": time.time(),
+                                                   "ip": remote_ip,
+                                                   "session_id": session_id,
+                                                   "username": username,
+                                                   "count": 1}
+            else:
+                # tries take more than 30 seconds between each one: do not
+                # increase count
+                if (time.time() -
+                        self.failed_logins[user_ip_sid]["time"]) < 30:
+
+                    self.failed_logins[user_ip_sid]["time"] = time.time()
+                    self.failed_logins[user_ip_sid]["count"] += 1
+
+            # more than 3 fails: raise error
+            if self.failed_logins[user_ip_sid]["count"] > 3:
+                _raise_timeout(user_ip_sid)
             raise
         finally:
             log_request(code, params, details, method, status)
diff --git a/ui/js/src/wok.login.js b/ui/js/src/wok.login.js
index 666a339..9e2a392 100644
--- a/ui/js/src/wok.login.js
+++ b/ui/js/src/wok.login.js
@@ -19,6 +19,10 @@
  */
 wok.login_main = function() {
     "use strict";
+    var i18n;
+    wok.getI18n(function(i18nObj){
+        i18n = i18nObj;
+     }, false, "i18n.json", true);
 
     // verify if language is available
     var selectedLanguage = wok.lang.get();
@@ -50,7 +54,8 @@ wok.login_main = function() {
     var query = window.location.search;
     var error = /.*error=(.*?)(&|$)/g.exec(query);
     if (error && error[1] === "sessionTimeout") {
-        $("#messSession").show();
+        $("#errorArea").html(i18n["WOKAUT0001E"]);
+        $("#errorArea").show();
     }
 
     var userNameBox = $('#username');
@@ -82,13 +87,13 @@ wok.login_main = function() {
             window.location.replace(window.location.pathname.replace(/\/+login.html/, '') + next_url);
         }, function(jqXHR, textStatus, errorThrown) {
             if (jqXHR.responseText == "") {
-                $("#messUserPass").hide();
-                $("#missServer").show();
-            } else {
-                $("#missServer").hide();
-                $("#messUserPass").show();
+                $("#errorArea").html(i18n["WOKAUT0002E"]);
+                $("#errorArea").show();
+            } else if ((jqXHR.responseJSON != undefined) &&
+                       ! (jqXHR.responseJSON["reason"] == undefined)) {
+                $("#errorArea").html(jqXHR.responseJSON["reason"]);
+                $("#errorArea").show();
             }
-            $("#messSession").hide();
             $("#logging").hide();
             $("#login").show();
         });
diff --git a/ui/pages/i18n.json.tmpl b/ui/pages/i18n.json.tmpl
index ba29532..4329ad0 100644
--- a/ui/pages/i18n.json.tmpl
+++ b/ui/pages/i18n.json.tmpl
@@ -1,7 +1,7 @@
 #*
  * Project Wok
  *
- * Copyright IBM Corp, 2014-2016
+ * Copyright IBM Corp, 2014-2017
  *
  * Code derived from Project Kimchi
  *
@@ -39,6 +39,9 @@
 
     "WOKHOST6001M": "$_("Max:")",
 
+    "WOKAUT0001E": "$_("Session timeout, please re-login.")",
+    "WOKAUT0002E": "$_("Server unreachable")",
+
     "WOKSETT0001M": "$_("Application")",
     "WOKSETT0002M": "$_("User")",
     "WOKSETT0003M": "$_("Request")",
diff --git a/ui/pages/login.html.tmpl b/ui/pages/login.html.tmpl
index f5a4b2d..6f967cf 100644
--- a/ui/pages/login.html.tmpl
+++ b/ui/pages/login.html.tmpl
@@ -1,7 +1,7 @@
 #*
  * Project Wok
  *
- * Copyright IBM Corp, 2014-2016
+ * Copyright IBM Corp, 2014-2017
  *
  * Code derived from Project Kimchi
  *
@@ -104,9 +104,7 @@
         <div class="container">
             <div id="login-window" class="login-area row">
                 <div class="err-area">
-                    <div id="messUserPass" class="alert alert-danger" style="display: none;">$_("The username or password you entered is incorrect. Please try again.")</div>
-                    <div id="messSession" class="alert alert-danger" style="display: none;">$_("Session timeout, please re-login.")</div>
-                    <div id="missServer" class="alert alert-danger" style="display: none;">$_("Server unreachable.")</div>
+                    <div id="errorArea" class="alert alert-danger" style="display: none;"></div>
                 </div>
                 <form id="form-login" class="form-horizontal" method="post">
                     <div class="form-group">
-- 
2.10.1 (Apple Git-78)

    

ramonn＠linux.vnet.ibm.com

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