/usr/share/common-lisp/source/cl-aserve/authorize.cl is in cl-aserve 1.2.42+cvs.2010.02.08-dfsg-1.2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 | ;; -*- mode: common-lisp; package: net.aserve -*-
;;
;; authorize.cl
;;
;; copyright (c) 1986-2000 Franz Inc, Berkeley, CA - All rights reserved.
;; copyright (c) 2000-2004 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;; http://www.gnu.org/copyleft/lesser.txt (until superseded by a newer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 1.8 2005-02-20 12:20:45 rudi 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*
: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 (acl-compat.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 (acl-compat.socket:dotted-to-ipaddr ipaddress
:errorp nil)))
(if* (null newaddr)
then ; success!
(ignore-errors
(setq newaddr (acl-compat.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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