sasl.el

   1 ;;; sasl.el --- basic functions for SASL
   2
   3 ;; Copyright (C) 1995, 1996, 1998, 1999 Free Software Foundation, Inc.
   4
   5 ;; Author: Kenichi OKADA <okada@opaopa.org>
   6 ;; Keywords: SMTP, SASL, RFC2222
   7
   8 ;; This file is part of FLIM (Faithful Library about Internet Message).
   9
  10 ;; This program is free software; you can redistribute it and/or
  11 ;; modify it under the terms of the GNU General Public License as
  12 ;; published by the Free Software Foundation; either version 2, or (at
  13 ;; your option) any later version.
  14
  15 ;; This program is distributed in the hope that it will be useful, but
  16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 ;; General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with this program; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; Example.
  28 ;;
  29 ;; (base64-encode-string
  30 ;;  (sasl-scram-md5-client-msg-2
  31 ;;   (base64-decode-string "dGVzdHNhbHQBAAAAaW1hcEBlbGVhbm9yLmlubm9zb2Z0LmNvbQBqaGNOWmxSdVBiemlGcCt2TFYrTkN3")
  32 ;;   (base64-decode-string "AGNocmlzADx0NG40UGFiOUhCMEFtL1FMWEI3MmVnQGVsZWFub3IuaW5ub3NvZnQuY29tPg==")
  33 ;;   (scram-md5-make-salted-pass
  34 ;;    "secret stuff" "testsalt")))
  35 ;; => "AQAAAMg9jU8CeB4KOfk7sUhSQPs="
  36 ;;
  37 ;; (base64-encode-string
  38 ;;  (scram-md5-make-server-msg-2
  39 ;;   (base64-decode-string "dGVzdHNhbHQBAAAAaW1hcEBlbGVhbm9yLmlubm9zb2Z0LmNvbQBqaGNOWmxSdVBiemlGcCt2TFYrTkN3")
  40 ;;   (base64-decode-string "AGNocmlzADx0NG40UGFiOUhCMEFtL1FMWEI3MmVnQGVsZWFub3IuaW5ub3NvZnQuY29tPg==")
  41 ;;   (scram-make-security-info nil t 0)
  42 ;;   "testsalt"
  43 ;;   (scram-md5-make-salted-pass
  44 ;;    "secret stuff" "testsalt")))
  45 ;; => "U0odqYw3B7XIIW0oSz65OQ=="
  46
  47 ;;; Code:
  48
  49 (require 'hmac-md5)
  50 (require 'scram-md5)
  51
  52 ;;; CRAM-MD5
  53 (defun sasl-cram-md5 (username passphrase challenge)
  54   (let ((secure-word (copy-sequence passphrase)))
  55     (setq secure-word (unwind-protect
  56                           (hmac-md5 challenge secure-word)
  57                         (fillarray secure-word 0))
  58           secure-word (unwind-protect
  59                           (encode-hex-string secure-word)
  60                         (fillarray secure-word 0))
  61           secure-word (unwind-protect
  62                           (concat username " " secure-word)
  63                         (fillarray secure-word 0)))))
  64
  65 ;;; PLAIN
  66 (defun sasl-plain (authorid authenid passphrase)
  67   (concat authorid "\0" authenid "\0" passphrase))
  68
  69 ;;; SCRAM-MD5
  70 (defvar sasl-scram-md5-client-security-info
  71   (scram-make-security-info nil t 0))
  72
  73 (defun sasl-scram-md5-make-salted-pass (server-msg-1 passphrase)
  74   (scram-md5-make-salted-pass
  75    passphrase
  76    (car
  77     (scram-md5-parse-server-msg-1 server-msg-1))))
  78
  79 (defun sasl-scram-md5-client-msg-1 (authenticate-id &optional authorize-id)
  80   (scram-md5-make-client-msg-1 authenticate-id authorize-id))
  81
  82 (defun sasl-scram-md5-client-msg-2 (server-msg-1 client-msg-1 salted-pass)
  83   (let (client-proof client-key shared-key client-verifier)
  84     (setq client-key
  85           (scram-md5-make-client-key salted-pass))
  86     (setq client-verifier
  87           (scram-md5-make-client-verifier client-key))
  88     (setq shared-key
  89           (unwind-protect
  90               (scram-md5-make-shared-key
  91                server-msg-1
  92                client-msg-1
  93                sasl-scram-md5-client-security-info
  94                client-verifier)
  95             (fillarray client-verifier 0)))
  96     (setq client-proof
  97           (unwind-protect
  98               (scram-md5-make-client-proof
  99                client-key shared-key)
 100             (fillarray client-key 0)
 101             (fillarray shared-key 0)))
 102     (unwind-protect
 103         (scram-md5-make-client-msg-2
 104          sasl-scram-md5-client-security-info
 105          client-proof)
 106       (fillarray client-proof 0))))
 107
 108 (defun sasl-scram-md5-authenticate-server (server-msg-1
 109                                            server-msg-2
 110                                            client-msg-1
 111                                            salted-pass)
 112   (string= server-msg-2
 113            (scram-md5-make-server-msg-2
 114             server-msg-1
 115             client-msg-1
 116             sasl-scram-md5-client-security-info
 117             (car
 118              (scram-md5-parse-server-msg-1 server-msg-1))
 119             salted-pass)))
 120
 121 (provide 'sasl)
 122
 123 ;;; sasl.el ends here