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Diffstat (limited to 'lisp/gnus/mml-sec.el')
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diff --git a/lisp/gnus/mml-sec.el b/lisp/gnus/mml-sec.el new file mode 100644 index 00000000000..f726013dc2c --- /dev/null +++ b/lisp/gnus/mml-sec.el @@ -0,0 +1,293 @@ +;;; mml-sec.el --- A package with security functions for MML documents +;; Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. + +;; Author: Simon Josefsson <simon@josefsson.org> + +;; 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 2, 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; see the file COPYING. If not, write to the +;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, +;; Boston, MA 02111-1307, USA. + +;;; Commentary: + +;;; Code: + +(require 'mml-smime) +(eval-when-compile (require 'cl)) +(autoload 'mml2015-sign "mml2015") +(autoload 'mml2015-encrypt "mml2015") +(autoload 'mml1991-sign "mml1991") +(autoload 'mml1991-encrypt "mml1991") +(autoload 'message-goto-body "message") +(autoload 'mml-insert-tag "mml") + +(defvar mml-sign-alist + '(("smime" mml-smime-sign-buffer mml-smime-sign-query) + ("pgp" mml-pgp-sign-buffer list) + ("pgpauto" mml-pgpauto-sign-buffer list) + ("pgpmime" mml-pgpmime-sign-buffer list)) + "Alist of MIME signer functions.") + +(defcustom mml-default-sign-method "pgpmime" + "Default sign method. +The string must have an entry in `mml-sign-alist'." + :type '(choice (const "smime") + (const "pgp") + (const "pgpauto") + (const "pgpmime") + string) + :group 'message) + +(defvar mml-encrypt-alist + '(("smime" mml-smime-encrypt-buffer mml-smime-encrypt-query) + ("pgp" mml-pgp-encrypt-buffer list) + ("pgpauto" mml-pgpauto-sign-buffer list) + ("pgpmime" mml-pgpmime-encrypt-buffer list)) + "Alist of MIME encryption functions.") + +(defcustom mml-default-encrypt-method "pgpmime" + "Default encryption method. +The string must have an entry in `mml-encrypt-alist'." + :type '(choice (const "smime") + (const "pgp") + (const "pgpauto") + (const "pgpmime") + string) + :group 'message) + +(defcustom mml-signencrypt-style-alist + '(("smime" separate) + ("pgp" combined) + ("pgpauto" combined) + ("pgpmime" combined)) + "Alist specifying if `signencrypt' results in two separate operations or not. +The first entry indicates the MML security type, valid entries include +the strings \"smime\", \"pgp\", and \"pgpmime\". The second entry is +a symbol `separate' or `combined' where `separate' means that MML signs +and encrypt messages in a two step process, and `combined' means that MML +signs and encrypt the message in one step. + +Note that the output generated by using a `combined' mode is NOT +understood by all PGP implementations, in particular PGP version +2 does not support it! See Info node `(message)Security' for +details." + :type '(repeat (list (choice (const :tag "S/MIME" "smime") + (const :tag "PGP" "pgp") + (const :tag "PGP/MIME" "pgpmime") + (string :tag "User defined")) + (choice (const :tag "Separate" separate) + (const :tag "Combined" combined))))) + +;;; Configuration/helper functions + +(defun mml-signencrypt-style (method &optional style) + "Function for setting/getting the signencrypt-style used. Takes two +arguments, the method (e.g. \"pgp\") and optionally the mode +\(e.g. combined). If the mode is omitted, the current value is returned. + +For example, if you prefer to use combined sign & encrypt with +smime, putting the following in your Gnus startup file will +enable that behavior: + +\(mml-set-signencrypt-style \"smime\" combined) + +You can also customize or set `mml-signencrypt-style-alist' instead." + (let ((style-item (assoc method mml-signencrypt-style-alist))) + (if style-item + (if (or (eq style 'separate) + (eq style 'combined)) + ;; valid style setting? + (setf (second style-item) style) + ;; otherwise, just return the current value + (second style-item)) + (gnus-message 3 "Warning, attempt to set invalid signencrypt-style")))) + +;;; Security functions + +(defun mml-smime-sign-buffer (cont) + (or (mml-smime-sign cont) + (error "Signing failed... inspect message logs for errors"))) + +(defun mml-smime-encrypt-buffer (cont &optional sign) + (when sign + (message "Combined sign and encrypt S/MIME not support yet") + (sit-for 1)) + (or (mml-smime-encrypt cont) + (error "Encryption failed... inspect message logs for errors"))) + +(defun mml-pgp-sign-buffer (cont) + (or (mml1991-sign cont) + (error "Signing failed... inspect message logs for errors"))) + +(defun mml-pgp-encrypt-buffer (cont &optional sign) + (or (mml1991-encrypt cont sign) + (error "Encryption failed... inspect message logs for errors"))) + +(defun mml-pgpmime-sign-buffer (cont) + (or (mml2015-sign cont) + (error "Signing failed... inspect message logs for errors"))) + +(defun mml-pgpmime-encrypt-buffer (cont &optional sign) + (or (mml2015-encrypt cont sign) + (error "Encryption failed... inspect message logs for errors"))) + +(defun mml-pgpauto-sign-buffer (cont) + (message-goto-body) + (or (if (re-search-backward "Content-Type: *multipart/.*" nil t) ; there must be a better way... + (mml2015-sign cont) + (mml1991-sign cont)) + (error "Encryption failed... inspect message logs for errors"))) + +(defun mml-pgpauto-encrypt-buffer (cont &optional sign) + (message-goto-body) + (or (if (re-search-backward "Content-Type: *multipart/.*" nil t) ; there must be a better way... + (mml2015-encrypt cont sign) + (mml1991-encrypt cont sign)) + (error "Encryption failed... inspect message logs for errors"))) + +(defun mml-secure-part (method &optional sign) + (save-excursion + (let ((tags (funcall (nth 2 (assoc method (if sign mml-sign-alist + mml-encrypt-alist)))))) + (cond ((re-search-backward + "<#\\(multipart\\|part\\|external\\|mml\\)" nil t) + (goto-char (match-end 0)) + (insert (if sign " sign=" " encrypt=") method) + (while tags + (let ((key (pop tags)) + (value (pop tags))) + (when value + ;; Quote VALUE if it contains suspicious characters. + (when (string-match "[\"'\\~/*;() \t\n]" value) + (setq value (prin1-to-string value))) + (insert (format " %s=%s" key value)))))) + ((or (re-search-backward + (concat "^" (regexp-quote mail-header-separator) "\n") nil t) + (re-search-forward + (concat "^" (regexp-quote mail-header-separator) "\n") nil t)) + (goto-char (match-end 0)) + (apply 'mml-insert-tag 'part (cons (if sign 'sign 'encrypt) + (cons method tags)))) + (t (error "The message is corrupted. No mail header separator")))))) + +(defun mml-secure-sign-pgp () + "Add MML tags to PGP sign this MML part." + (interactive) + (mml-secure-part "pgp" 'sign)) + +(defun mml-secure-sign-pgpauto () + "Add MML tags to PGP-auto sign this MML part." + (interactive) + (mml-secure-part "pgpauto" 'sign)) + +(defun mml-secure-sign-pgpmime () + "Add MML tags to PGP/MIME sign this MML part." + (interactive) + (mml-secure-part "pgpmime" 'sign)) + +(defun mml-secure-sign-smime () + "Add MML tags to S/MIME sign this MML part." + (interactive) + (mml-secure-part "smime" 'sign)) + +(defun mml-secure-encrypt-pgp () + "Add MML tags to PGP encrypt this MML part." + (interactive) + (mml-secure-part "pgp")) + +(defun mml-secure-encrypt-pgpmime () + "Add MML tags to PGP/MIME encrypt this MML part." + (interactive) + (mml-secure-part "pgpmime")) + +(defun mml-secure-encrypt-smime () + "Add MML tags to S/MIME encrypt this MML part." + (interactive) + (mml-secure-part "smime")) + +;; defuns that add the proper <#secure ...> tag to the top of the message body +(defun mml-secure-message (method &optional modesym) + (let ((mode (prin1-to-string modesym)) + insert-loc) + (mml-unsecure-message) + (save-excursion + (goto-char (point-min)) + (cond ((re-search-forward + (concat "^" (regexp-quote mail-header-separator) "\n") nil t) + (goto-char (setq insert-loc (match-end 0))) + (unless (looking-at "<#secure") + (mml-insert-tag + 'secure 'method method 'mode mode))) + (t (error + "The message is corrupted. No mail header separator")))) + (when (eql insert-loc (point)) + (forward-line 1)))) + +(defun mml-unsecure-message () + "Remove security related MML tags from message." + (interactive) + (save-excursion + (goto-char (point-max)) + (when (re-search-backward "^<#secure.*>\n" nil t) + (delete-region (match-beginning 0) (match-end 0))))) + +(defun mml-secure-message-sign-smime () + "Add MML tag to encrypt/sign the entire message." + (interactive) + (mml-secure-message "smime" 'sign)) + +(defun mml-secure-message-sign-pgp () + "Add MML tag to encrypt/sign the entire message." + (interactive) + (mml-secure-message "pgp" 'sign)) + +(defun mml-secure-message-sign-pgpmime () + "Add MML tag to encrypt/sign the entire message." + (interactive) + (mml-secure-message "pgpmime" 'sign)) + +(defun mml-secure-message-sign-pgpauto () + "Add MML tag to encrypt/sign the entire message." + (interactive) + (mml-secure-message "pgpauto" 'sign)) + +(defun mml-secure-message-encrypt-smime (&optional dontsign) + "Add MML tag to encrypt and sign the entire message. +If called with a prefix argument, only encrypt (do NOT sign)." + (interactive "P") + (mml-secure-message "smime" (if dontsign 'encrypt 'signencrypt))) + +(defun mml-secure-message-encrypt-pgp (&optional dontsign) + "Add MML tag to encrypt and sign the entire message. +If called with a prefix argument, only encrypt (do NOT sign)." + (interactive "P") + (mml-secure-message "pgp" (if dontsign 'encrypt 'signencrypt))) + +(defun mml-secure-message-encrypt-pgpmime (&optional dontsign) + "Add MML tag to encrypt and sign the entire message. +If called with a prefix argument, only encrypt (do NOT sign)." + (interactive "P") + (mml-secure-message "pgpmime" (if dontsign 'encrypt 'signencrypt))) + +(defun mml-secure-message-encrypt-pgpauto (&optional dontsign) + "Add MML tag to encrypt and sign the entire message. +If called with a prefix argument, only encrypt (do NOT sign)." + (interactive "P") + (mml-secure-message "pgpauto" (if dontsign 'encrypt 'signencrypt))) + +(provide 'mml-sec) + +;;; arch-tag: 111c56e7-df5e-4287-87d7-93ed2911ec6c +;;; mml-sec.el ends here |