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;; -*- mode: common-lisp; package: net.aserve -*-
;;
;; authorize.cl
;;
;; copyright (c) 1986-2005 Franz Inc, Berkeley, CA - All rights reserved.
;; copyright (c) 2000-2012 Franz Inc, Oakland, CA - All rights reserved.
;;
;; This code is free software; you can redistribute it and/or
;; modify it under the terms of the version 2.1 of
;; the GNU Lesser General Public License as published by
;; the Free Software Foundation, as clarified by the AllegroServe
;; prequel found in license-allegroserve.txt.
;;
;; This code 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
;; Lesser General Public License for more details.
;;
;; Version 2.1 of the GNU Lesser General Public License is in the file
;; license-lgpl.txt that was distributed with this file.
;; If it is not present, you can access it from
;; http://www.gnu.org/copyleft/lesser.txt (until superseded by a newer
;; version) or write to the Free Software Foundation, Inc., 59 Temple Place,
;; Suite 330, Boston, MA 02111-1307 USA
;;

;; $Id: authorize.cl,v 1.11 2007/04/17 22:05:04 layer Exp $

;; Description:
;; classes and functions for authorizing access to entities

;;- This code in this file obeys the Lisp Coding Standard found in
;;- http://www.franz.com/~jkf/coding_standards.html
;;-

(in-package :net.aserve)

(defclass authorizer ()
  ;; denotes information on authorizing access to an entity
  ;; this is meant to be subclassed with the appropriate slots
  ;; for the type of authorization to be done
  ())



;; - password authorization.
;;
(defclass password-authorizer (authorizer)
  ((allowed :accessor password-authorizer-allowed
;; list of conses (name . password)
;; which are valid name, password pairs for this entity
:initarg :allowed
:initform nil)
   (realm :accessor password-authorizer-realm
:initarg :realm
:initform "AllegroServe")
   ))



(defmethod authorize ((auth password-authorizer)
(req http-request)
(ent entity))
  ;; check if this is valid request, return t if ok
  ;; and :done if we've sent a request for a new name and password
  ;;
  (multiple-value-bind (name password) (get-basic-authorization req)
    
    (if* name
       then (dolist (pair (password-authorizer-allowed auth))
(if* (and (equal (car pair) name)
(equal (cdr pair) password))
then (return-from authorize t))))

    ;; valid name/password not given, ask for it
    (with-http-response (req *dummy-computed-entity*
:response *response-unauthorized*
:content-type "text/html"
:format :text)
      (set-basic-authorization req
(password-authorizer-realm auth))
      
      ; this is done to preventing a chunking response which
      ; confuse the proxy (for now)..
      (if* (member ':use-socket-stream (request-reply-strategy req))
then (setf (request-reply-strategy req)
'(:string-output-stream
:post-headers)))

      (with-http-body (req *dummy-computed-entity*)
(html (:html (:body (:h1 "Access is not authorized"))))
))
    :done))


  


;; location authorization
;; we allow access based on where the request is made from.
;; the pattern list is a list of items to match against the
;; ip address of the request. When the first match is made the
;; request is either accepted or denied.
;;
;; the possible items in the list of patterns
;; :accept accept immediately
;; :deny deny immediately
;; (:accept ipaddress [bits]) accept if left 'bits' of the
;; ipaddress match
;; (:deny ipaddress [bits]) deny if the left 'bits' of the
;; ipaddress match
;;
;; bits defaults to 32
;; the ipaddress can be an
;; integer - the 32 bit ip address
;; string
;; "127.0.0.1" - the dotted notation for an ip address
;; "foo.bar.com" - the name of a machine
;; when the ipaddress is a string it is converted to an integer
;; the first time it is examined.
;; When the string is a machine name then the conversion may or
;; may not work due to the need to access a nameserver to do
;; the lookup.
;;
;;
;;


(defclass location-authorizer (authorizer)
  ((patterns :accessor location-authorizer-patterns
;; list of patterns to match
:initarg :patterns
:initform nil)))




(defmethod authorize ((auth location-authorizer)
(req http-request)
(ent entity))
  (let ((request-ipaddress (socket:remote-host (request-socket req))))
    (dolist (pattern (location-authorizer-patterns auth))
      (if* (atom pattern)
then (case pattern
(:accept (return-from authorize t))
(:deny (return-from authorize nil))
(t (warn "bogus authorization pattern: ~s" pattern)
(return-from authorize nil)))
else (let ((decision (car pattern))
(ipaddress (cadr pattern))
(bits (if* (cddr pattern)
then (caddr pattern)
else 32)))
(if* (not (member decision '(:accept :deny)))
then (warn "bogus authorization pattern: ~s" pattern)
(return-from authorize nil))

(if* (stringp ipaddress)
then ; check for dotted ip address first
(let ((newaddr (socket:dotted-to-ipaddr ipaddress
:errorp nil)))
(if* (null newaddr)
then ; success!
(ignore-errors
(setq newaddr (socket:lookup-hostname ipaddress))))

(if* newaddr
then (setf (cadr pattern)
(setq ipaddress newaddr))
else ; can't compute the address
; so we'll not accept and we will deny
; just to be safe
(warn "can't resolve host name ~s" ipaddress)
(return-from authorize nil))))


(if* (not (and (integerp bits) (<= 1 bits 32)))
then (warn "bogus authorization pattern: ~s" pattern)
(return-from authorize nil))

; now we're finally ready to test things
(let ((mask (if* (eql bits 32)
then -1
else (ash -1 (- 32 bits)))))
(if* (eql (logand request-ipaddress mask)
(logand ipaddress mask))
then ; matched,
(case decision
(:accept (return-from authorize t))
(:deny (return-from authorize nil))))))))
    
    t ; the default is to accept
    ))


;; - function authorization

(defclass function-authorizer (authorizer)
  ((function :accessor function-authorizer-function
:initarg :function
:initform nil)))

(defmethod authorize ((auth function-authorizer)
(req http-request)
(ent entity))
  (let ((fun (function-authorizer-function auth)))
    (if* fun
       then (funcall fun req ent auth))))















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