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;;; bbdb-pgp.el --- use BBDB to store PGP preferences
;; Copyright (C) 1997,1999 Kevin Davidson
;; Author: Kevin Davidson tkld@quadstone.com
;; Maintainer: Kevin Davidson tkld@quadstone.com
;; Created: 10 Nov 1997
;; Keywords: PGP BBDB message mailcrypt
;; This program 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 2, or (at your option)
;; any later version.
;; This program 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.
;; A copy of the GNU General Public License can be obtained from this
;; program's author (send electronic mail to tkld@quadstone.com) or
;; from the Free Software Foundation, Inc.,59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;; LCD Archive Entry:
;; bbdb-pgp|Kevin Davidson|tkld@quadstone.com
;; |Use BBDB to store PGP preferences
;; |Date|Revision|~/packages/bbdb-pgp.el
;;; Commentary:
;;
;; It is believed that encrypted mail works best if all mail between
;; individuals is encrypted - even concerning matters that are not
;; confidential. The reasoning is that confidential messages cannot
;; then be easily spotted and decryption efforts concentrated on them.
;; Some people therefore prefer to have all their email encrypted.
;; This package allows you to mark the BBDB entries for those
;; individuals so that messages will be encrypted when they are sent.
;;
;; These packages are required: BBDB, mailcrypt, message
;;
;; message.el is included with recent versions of Emacs.
;; You can use mail-mode as well as message-mode to send mail.
;;; Usage:
;; (require 'bbdb-pgp)
;;
;; Then for all users who you want to send encrypted mail to, add the field
;; pgp-mail with the value `encrypt'. Alternatively you can add the value
;; `sign' if you just want to send signed messages.
;;
;; and possibly (if you do not want the PGP field printed out)
;; (add-hook 'bbdb-print-elide bbdb-pgp-field)
;;
;; The variable bbdb/pgp-default-action defines what to do if the recipient
;; is not in the BBDB.
;;; TODO
;; Spot incoming PGP mail by hooking into mc-verify/decrypt and adding pgp-mail
;; field to BBDB entry (creating one if necessary); like bbdb-sc.el maintains
;; attribution prefs.
;;; PGP Public Key
;; The author's public key is available from any public PGP keyserver
;; eg http://www.pgp.net/pgpnet/
;; Fingerprint: 1F A9 3F 3E 90 F7 85 64 55 35 32 C8 75 91 3A E3
;;; Code:
(require 'message)
(require 'bbdb)
(condition-case nil (require 'mailcrypt) (error nil))
;;;###autoload
(defgroup bbdb-utilities-pgp nil
"Automatically sign and/or encrypt outgoing messages."
:link '(emacs-library-link :tag "Lisp Source File" "bbdb-pgp.el")
:group 'bbdb-utilities)
(defcustom bbdb/pgp-field 'pgp-mail
"*Field to use in BBDB to store PGP preferences.
If this field's value in a record is \"encrypt\" then messages are
encrypted. If it is \"sign\" then messages are signed."
:type 'symbol
:tag "BBDB Field"
:require 'bbdb
:group 'bbdb-utilities-pgp)
(defcustom bbdb/pgp-method 'mailcrypt
"*How to sign or encrypt messages.
'mailcrypt means use Mailcrypt.
'mml-pgp means add MML tags for Message to use old PGP format
'mml-pgpmime means add MML tags for Message to use PGP/MIME
'mml-smime means add MML tags for Message to use S/MIME"
:type '(choice
(const :tag "Mailcrypt" mailcrypt :require 'mailcrypt)
(const :tag "MML PGP" mml-pgp :require 'mml)
(const :tag "MML PGP/MIME" mml-pgpmime :require 'mml)
(const :tag "MML S/MIME" mml-smime :require 'mml))
:tag "Signing/Encryption Method"
:group 'bbdb-utilities-pgp)
(defcustom bbdb/pgp-default-action nil
"*Default action when sending a message and the recipient is not in BBDB.
nil means do nothing.
'encrypt means encrypt message.
'sign means sign message."
:type '(choice
(const :tag "Do Nothing")
(const :tag "Encrypt" encrypt)
(const :tag "Sign" sign))
:tag "Default Action"
:group 'bbdb-utilities-pgp)
(defcustom bbdb/pgp-quiet nil
"*Do not ask for confirmation on pgp-action.
nil means normal messages/questions.
't means to be quiet."
:type '(choice
(const :tag "normal")
(const :tag "quiet" t))
:tag "Quietness"
:group 'bbdb-utilities-pgp)
(defun bbdb/pgp-get-pgp (name address)
"Look up user NAME and ADDRESS in BBDB and return the PGP preference."
(let* ((record (bbdb-search-simple name address))
(pgp (and record
(bbdb-record-getprop record bbdb/pgp-field))))
pgp))
(defun bbdb/pgp-sign ()
"Sign a message.
bbdb/pgp-method controls the method used."
(cond
((eq bbdb/pgp-method 'mailcrypt)
(mc-sign 0))
((eq bbdb/pgp-method 'mml-pgp)
(mml-secure-message-sign-pgp))
((eq bbdb/pgp-method 'mml-pgpmime)
(mml-secure-message-sign-pgpmime))
((eq bbdb/pgp-method 'mml-smime)
(mml-secure-message-sign-smime))
(t
(error 'invalid-state "bbdb/pgp-method"))))
(defun bbdb/pgp-encrypt ()
"Encrypt and sign a message.
bbdb/pgp-method controls the method used."
(cond
((eq bbdb/pgp-method 'mailcrypt)
(mc-encrypt 0))
((eq bbdb/pgp-method 'mml-pgp)
(mml-secure-message-encrypt-pgp))
((eq bbdb/pgp-method 'mml-pgpmime)
(mml-secure-message-encrypt-pgpmime))
((eq bbdb/pgp-method 'mml-smime)
(mml-secure-message-encrypt-smime))
(t
(error 'invalid-state "bbdb/pgp-method"))))
(defun bbdb/pgp-hook-fun ()
"Function to be added to message-send-hook
Uses PGP to encrypt messages to users marked in the BBDB with the
field `bbdb/pgp-field'.
The user is prompted before encryption or signing."
(save-restriction
(save-excursion
(message-narrow-to-headers)
(and (featurep 'mailalias)
(not (featurep 'mailabbrev))
mail-aliases
(expand-mail-aliases (point-min) (point-max)))
(let* ((to-field (mail-fetch-field "To" nil t))
(address (mail-extract-address-components (or to-field ""))))
(widen)
(if (not (equal address '(nil nil)))
(let ((pgp-p (bbdb/pgp-get-pgp (car address) (car (cdr address)))))
(cond
((string= "encrypt" pgp-p)
(and (or bbdb/pgp-quiet
(y-or-n-p "Encrypt message? "))
(bbdb/pgp-encrypt)))
((string= "sign" pgp-p)
(and (or bbdb/pgp-quiet
(y-or-n-p "Sign message? "))
(bbdb/pgp-sign)))
(t
(cond
((eq bbdb/pgp-default-action 'encrypt)
(and (y-or-n-p "Encrypt message? ")
(bbdb/pgp-encrypt)))
((eq bbdb/pgp-default-action 'sign)
(and (y-or-n-p "Sign message? ")
(bbdb/pgp-sign)))
(t
nil))))))))))
(add-hook 'message-send-hook 'bbdb/pgp-hook-fun)
(add-hook 'mail-send-hook 'bbdb/pgp-hook-fun)
(provide 'bbdb-pgp)
;;; bbdb-pgp.el ends here
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