mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-02 08:22:22 +00:00
158 lines
4.7 KiB
EmacsLisp
158 lines
4.7 KiB
EmacsLisp
;;; sasl-digest.el --- DIGEST-MD5 module for the SASL client framework
|
|
|
|
;; Copyright (C) 2000, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
|
|
|
|
;; Author: Daiki Ueno <ueno@unixuser.org>
|
|
;; Kenichi OKADA <okada@opaopa.org>
|
|
;; Keywords: SASL, DIGEST-MD5
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs is free software: you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation, either version 3 of the License, or
|
|
;; (at your option) any later version.
|
|
|
|
;; GNU Emacs 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 General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
;;; Commentary:
|
|
|
|
;; This program is implemented from draft-leach-digest-sasl-05.txt.
|
|
;;
|
|
;; It is caller's responsibility to base64-decode challenges and
|
|
;; base64-encode responses in IMAP4 AUTHENTICATE command.
|
|
;;
|
|
;; Passphrase should be longer than 16 bytes. (See RFC 2195)
|
|
|
|
;;; Commentary:
|
|
|
|
(require 'sasl)
|
|
(require 'hmac-md5)
|
|
|
|
(defvar sasl-digest-md5-nonce-count 1)
|
|
(defvar sasl-digest-md5-unique-id-function
|
|
sasl-unique-id-function)
|
|
|
|
(defvar sasl-digest-md5-syntax-table
|
|
(let ((table (make-syntax-table)))
|
|
(modify-syntax-entry ?= "." table)
|
|
(modify-syntax-entry ?, "." table)
|
|
table)
|
|
"A syntax table for parsing digest-challenge attributes.")
|
|
|
|
(defconst sasl-digest-md5-steps
|
|
'(ignore ;no initial response
|
|
sasl-digest-md5-response
|
|
ignore)) ;""
|
|
|
|
(defun sasl-digest-md5-parse-string (string)
|
|
"Parse STRING and return a property list.
|
|
The value is a cons cell of the form \(realm nonce qop-options stale maxbuf
|
|
charset algorithm cipher-opts auth-param)."
|
|
(with-temp-buffer
|
|
(set-syntax-table sasl-digest-md5-syntax-table)
|
|
(save-excursion
|
|
(insert string)
|
|
(goto-char (point-min))
|
|
(insert "(")
|
|
(while (progn (forward-sexp) (not (eobp)))
|
|
(delete-char 1)
|
|
(insert " "))
|
|
(insert ")")
|
|
(read (point-min-marker)))))
|
|
|
|
(defun sasl-digest-md5-digest-uri (serv-type host &optional serv-name)
|
|
(concat serv-type "/" host
|
|
(if (and serv-name
|
|
(not (string= host serv-name)))
|
|
(concat "/" serv-name))))
|
|
|
|
(defun sasl-digest-md5-cnonce ()
|
|
(let ((sasl-unique-id-function sasl-digest-md5-unique-id-function))
|
|
(sasl-unique-id)))
|
|
|
|
(defun sasl-digest-md5-response-value (username
|
|
realm
|
|
nonce
|
|
cnonce
|
|
nonce-count
|
|
qop
|
|
digest-uri
|
|
authzid)
|
|
(let ((passphrase
|
|
(sasl-read-passphrase
|
|
(format "DIGEST-MD5 passphrase for %s: "
|
|
username))))
|
|
(unwind-protect
|
|
(encode-hex-string
|
|
(md5-binary
|
|
(concat
|
|
(encode-hex-string
|
|
(md5-binary (concat (md5-binary
|
|
(concat username ":" realm ":" passphrase))
|
|
":" nonce ":" cnonce
|
|
(if authzid
|
|
(concat ":" authzid)))))
|
|
":" nonce
|
|
":" (format "%08x" nonce-count) ":" cnonce ":" qop ":"
|
|
(encode-hex-string
|
|
(md5-binary
|
|
(concat "AUTHENTICATE:" digest-uri
|
|
(if (member qop '("auth-int" "auth-conf"))
|
|
":00000000000000000000000000000000")))))))
|
|
(fillarray passphrase 0))))
|
|
|
|
(defun sasl-digest-md5-response (client step)
|
|
(let* ((plist
|
|
(sasl-digest-md5-parse-string (sasl-step-data step)))
|
|
(realm
|
|
(or (sasl-client-property client 'realm)
|
|
(plist-get plist 'realm))) ;need to check
|
|
(nonce-count
|
|
(or (sasl-client-property client 'nonce-count)
|
|
sasl-digest-md5-nonce-count))
|
|
(qop
|
|
(or (sasl-client-property client 'qop)
|
|
"auth"))
|
|
(digest-uri
|
|
(sasl-digest-md5-digest-uri
|
|
(sasl-client-service client)(sasl-client-server client)))
|
|
(cnonce
|
|
(or (sasl-client-property client 'cnonce)
|
|
(sasl-digest-md5-cnonce))))
|
|
(sasl-client-set-property client 'nonce-count (1+ nonce-count))
|
|
(unless (string= qop "auth")
|
|
(sasl-error (format "Unsupported \"qop-value\": %s" qop)))
|
|
(concat
|
|
"username=\"" (sasl-client-name client) "\","
|
|
"realm=\"" realm "\","
|
|
"nonce=\"" (plist-get plist 'nonce) "\","
|
|
"cnonce=\"" cnonce "\","
|
|
(format "nc=%08x," nonce-count)
|
|
"digest-uri=\"" digest-uri "\","
|
|
"qop=" qop ","
|
|
"response="
|
|
(sasl-digest-md5-response-value
|
|
(sasl-client-name client)
|
|
realm
|
|
(plist-get plist 'nonce)
|
|
cnonce
|
|
nonce-count
|
|
qop
|
|
digest-uri
|
|
(plist-get plist 'authzid)))))
|
|
|
|
(put 'sasl-digest 'sasl-mechanism
|
|
(sasl-make-mechanism "DIGEST-MD5" sasl-digest-md5-steps))
|
|
|
|
(provide 'sasl-digest)
|
|
|
|
;; arch-tag: 786e02ed-1bc4-4b3c-bf34-96c27e31084d
|
|
;;; sasl-digest.el ends here
|