Added authentication module.

1 files changed, 197 insertions, 0 deletions

diff --git a/source/auth.py b/source/auth.py
new file mode 100755
index 00000000..e2bdcf2b
--- /dev/null
+++ b/source/auth.py
@@ -0,0 +1,197 @@
+#! /usr/bin/env python
+#-*- coding: utf-8 -*-
+#
+# Form based authentication for CherryPy. Requires the
+# Session tool to be loaded.
+#
+
+import cherrypy
+import hashlib
+
+import log
+
+SESSION_KEY = '_cp_username'
+
+import csv
+class excel_french(csv.Dialect):
+    delimiter = ';'
+    quotechar = '"'
+    doublequote = True
+    skipinitialspace = False
+    lineterminator = '\n'
+    quoting = csv.QUOTE_MINIMAL
+
+csv.register_dialect('excel_french', excel_french)
+
+
+
+
+def check_credentials(username, password):
+    """Verifies credentials for username and password.
+    Returns None on success or a string describing the error on failure"""
+    # Adapt to your needs
+    USERS = {}
+    cr = csv.reader(open("./var/password", "r"), 'excel_french')
+    for row in cr:
+        USERS[row[0]] = row[1]
+
+    m = hashlib.sha1()
+    m.update(password)
+    if username in USERS.keys() and USERS[username] == m.hexdigest():
+        return None
+    else:
+        return u"Incorrect username or password."
+
+    # An example implementation which uses an ORM could be:
+    # u = User.get(username)
+    # if u is None:
+    #     return u"Username %s is unknown to me." % username
+    # if u.password != md5.new(password).hexdigest():
+    #     return u"Incorrect password"
+
+def check_auth(*args, **kwargs):
+    """A tool that looks in config for 'auth.require'. If found and it
+    is not None, a login is required and the entry is evaluated as a list of
+    conditions that the user must fulfill"""
+    conditions = cherrypy.request.config.get('auth.require', None)
+    if conditions is not None:
+        username = cherrypy.session.get(SESSION_KEY)
+        if username:
+            cherrypy.request.login = username
+            for condition in conditions:
+                # A condition is just a callable that returns true or false
+                if not condition():
+                    raise cherrypy.HTTPRedirect("/auth/login")
+        else:
+            raise cherrypy.HTTPRedirect("/auth/login")
+
+cherrypy.tools.auth = cherrypy.Tool('before_handler', check_auth)
+
+def require(*conditions):
+    """A decorator that appends conditions to the auth.require config
+    variable."""
+    def decorate(f):
+        if not hasattr(f, '_cp_config'):
+            f._cp_config = dict()
+        if 'auth.require' not in f._cp_config:
+            f._cp_config['auth.require'] = []
+        f._cp_config['auth.require'].extend(conditions)
+        return f
+    return decorate
+
+
+# Conditions are callables that return True
+# if the user fulfills the conditions they define, False otherwise
+#
+# They can access the current username as cherrypy.request.login
+#
+# Define those at will however suits the application.
+
+def member_of(groupname):
+    def check():
+        # replace with actual check if <username> is in <groupname>
+        return cherrypy.request.login == 'joe' and groupname == 'admin'
+    return check
+
+def name_is(reqd_username):
+    return lambda: reqd_username == cherrypy.request.login
+
+# These might be handy
+
+def any_of(*conditions):
+    """Returns True if any of the conditions match"""
+    def check():
+        for c in conditions:
+            if c():
+                return True
+        return False
+    return check
+
+# By default all conditions are required, but this might still be
+# needed if you want to use it inside of an any_of(...) condition
+def all_of(*conditions):
+    """Returns True if all of the conditions match"""
+    def check():
+        for c in conditions:
+            if not c():
+                return False
+        return True
+    return check
+
+
+
+class AuthController(object):
+    """
+    This class provides login and logout actions.
+    """
+    def __init__(self):
+        self.logger = log.Log()
+        self.username = ""
+
+    def on_login(self, username):
+        """
+        Called on successful login.
+        """
+        self.username = username
+        self.logger.info(username + ' logged in.')
+
+    def on_logout(self, username):
+        """
+        Called on logout.
+        """
+        self.logger.info(username + ' logged out.')
+        self.username = ""
+
+    def get_loginform(self, username, msg="Enter login information", from_page="/"):
+        """
+        Login page.
+        """
+        msg = ""
+        return """<html>
+    <head>
+        <link rel="stylesheet" type="text/css" href="/css/style.css" />
+    </head>
+    <body>
+        <img src="/img/tuxrss.png" alt="pyAggr3g470r" />
+        <div id="center">
+        <div id="main">
+        <form method="post" action="/auth/login">
+            <input type="hidden" name="from_page" value="%(from_page)s" />
+            %(msg)s<br />
+            <input type="text" name="username" value="%(username)s" placeholder="Username" /><br />
+            <input type="password" name="password" placeholder="Password" /><br />
+            <input type="submit" value="Log in" />
+        </div><!-- end #main -->
+        </div><!-- end #center -->
+    </body>
+</html>""" % locals()
+
+    @cherrypy.expose
+    def login(self, username=None, password=None, from_page="/"):
+        """
+        Open a session for an authenticated user.
+        """
+        if username is None or password is None:
+            return self.get_loginform("", from_page=from_page)
+
+        error_msg = check_credentials(username, password)
+        if error_msg:
+            self.logger.info(error_msg)
+            return self.get_loginform(username, error_msg, from_page)
+        else:
+            cherrypy.session[SESSION_KEY] = cherrypy.request.login = username
+            self.on_login(username)
+            raise cherrypy.HTTPRedirect(from_page or "/")
+
+    @cherrypy.expose
+    def logout(self, from_page="/"):
+        """
+        Cloase a session.
+        """
+        sess = cherrypy.session
+        username = sess.get(SESSION_KEY, None)
+        sess[SESSION_KEY] = None
+        if username:
+            cherrypy.request.login = None
+            self.on_logout(username)
+        raise cherrypy.HTTPRedirect(from_page or "/")