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|
;;; mml1991.el --- Old PGP message format (RFC 1991) support for MML -*- lexical-binding: t; -*-
;; Copyright (C) 1998-2025 Free Software Foundation, Inc.
;; Author: Sascha Lüdecke <sascha@meta-x.de>,
;; Simon Josefsson <simon@josefsson.org> (Mailcrypt interface, Gnus glue)
;; Keywords: PGP
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(eval-when-compile (require 'mm-util))
(require 'mm-encode)
(require 'mml-sec)
(defvar mc-pgp-always-sign)
(autoload 'quoted-printable-decode-region "qp")
(autoload 'quoted-printable-encode-region "qp")
(autoload 'mm-decode-content-transfer-encoding "mm-bodies")
(autoload 'mm-encode-content-transfer-encoding "mm-bodies")
(autoload 'message-options-get "message")
(autoload 'message-options-set "message")
(require 'mml2015)
(defvar mml1991-use mml2015-use
"The package used for PGP.")
(defvar mml1991-function-alist
'((mailcrypt mml1991-mailcrypt-sign
mml1991-mailcrypt-encrypt)
(pgg mml1991-pgg-sign
mml1991-pgg-encrypt)
(epg mml1991-epg-sign
mml1991-epg-encrypt))
"Alist of PGP functions.")
(defvar mml1991-cache-passphrase mml-secure-cache-passphrase
"If t, cache passphrase.")
(make-obsolete-variable 'mml1991-cache-passphrase
'mml-secure-cache-passphrase
"25.1")
(defvar mml1991-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
"How many seconds the passphrase is cached.
Whether the passphrase is cached at all is controlled by
`mml1991-cache-passphrase'.")
(make-obsolete-variable 'mml1991-passphrase-cache-expiry
'mml-secure-passphrase-cache-expiry
"25.1")
(defvar mml1991-signers nil
"A list of your own key ID which will be used to sign a message.")
(defvar mml1991-encrypt-to-self nil
"If t, add your own key ID to recipient list when encryption.")
;;; mailcrypt wrapper
(autoload 'mc-sign-generic "mc-toplev")
(defvar mml1991-decrypt-function 'mailcrypt-decrypt)
(defvar mml1991-verify-function 'mailcrypt-verify)
(defun mml1991-mailcrypt-sign (_cont)
(let ((text (current-buffer))
headers signature
(result-buffer (get-buffer-create "*GPG Result*")))
;; Save MIME Content[^ ]+: headers from signing
(goto-char (point-min))
(while (looking-at "^Content[^ ]+:") (forward-line))
(unless (bobp)
(setq headers (buffer-string))
(delete-region (point-min) (point)))
(goto-char (point-max))
(unless (bolp)
(insert "\n"))
(quoted-printable-decode-region (point-min) (point-max))
(with-temp-buffer
(setq signature (current-buffer))
(insert-buffer-substring text)
(unless (mc-sign-generic (message-options-get 'message-sender)
nil nil nil nil)
(unless (> (point-max) (point-min))
(pop-to-buffer result-buffer)
(error "Sign error")))
(goto-char (point-min))
(while (re-search-forward "\r+$" nil t)
(replace-match "" t t))
(quoted-printable-encode-region (point-min) (point-max))
(set-buffer text)
(delete-region (point-min) (point-max))
(if headers (insert headers))
(insert "\n")
(insert-buffer-substring signature)
(goto-char (point-max)))))
(declare-function mc-encrypt-generic "ext:mc-toplev"
(&optional recipients scheme start end from sign))
(defun mml1991-mailcrypt-encrypt (_cont &optional sign)
(let ((text (current-buffer))
(mc-pgp-always-sign
(or mc-pgp-always-sign
sign
(eq t (or (message-options-get 'message-sign-encrypt)
(message-options-set
'message-sign-encrypt
(or (y-or-n-p "Sign the message? ")
'not))))
'never))
cipher
(result-buffer (get-buffer-create "*GPG Result*")))
;; Strip MIME Content[^ ]: headers since it will be ASCII ARMORED
(goto-char (point-min))
(while (looking-at "^Content[^ ]+:") (forward-line))
(unless (bobp)
(delete-region (point-min) (point)))
(with-temp-buffer
(inline (mm-disable-multibyte))
(setq cipher (current-buffer))
(insert-buffer-substring text)
(unless (mc-encrypt-generic
(or
(message-options-get 'message-recipients)
(message-options-set 'message-recipients
(read-string "Recipients: ")))
nil
(point-min) (point-max)
(message-options-get 'message-sender)
'sign)
(unless (> (point-max) (point-min))
(pop-to-buffer result-buffer)
(error "Encrypt error")))
(goto-char (point-min))
(while (re-search-forward "\r+$" nil t)
(replace-match "" t t))
(set-buffer text)
(delete-region (point-min) (point-max))
;;(insert "Content-Type: application/pgp-encrypted\n\n")
;;(insert "Version: 1\n\n")
(insert "\n")
(insert-buffer-substring cipher)
(goto-char (point-max)))))
;; pgg wrapper
(autoload 'pgg-sign-region "pgg")
(autoload 'pgg-encrypt-region "pgg")
(defvar pgg-default-user-id)
(defvar pgg-errors-buffer)
(defvar pgg-output-buffer)
(defvar pgg-text-mode)
(defun mml1991-pgg-sign (_cont)
(let ((pgg-text-mode t)
(pgg-default-user-id (or (message-options-get 'mml-sender)
pgg-default-user-id))
headers cte)
;; Don't sign headers.
(goto-char (point-min))
(when (re-search-forward "^$" nil t)
(setq headers (buffer-substring (point-min) (point)))
(save-restriction
(narrow-to-region (point-min) (point))
(setq cte (mail-fetch-field "content-transfer-encoding")))
(forward-line 1)
(delete-region (point-min) (point))
(when cte
(setq cte (intern (downcase cte)))
(mm-decode-content-transfer-encoding cte)))
(unless (pgg-sign-region (point-min) (point-max) t)
(pop-to-buffer pgg-errors-buffer)
(error "Encrypt error"))
(delete-region (point-min) (point-max))
(insert
(with-temp-buffer
(set-buffer-multibyte nil)
(insert-buffer-substring pgg-output-buffer)
(goto-char (point-min))
(while (re-search-forward "\r+$" nil t)
(replace-match "" t t))
(when cte
(mm-encode-content-transfer-encoding cte))
(goto-char (point-min))
(when headers
(insert headers))
(insert "\n")
(buffer-string)))
t))
(defun mml1991-pgg-encrypt (_cont &optional sign)
(goto-char (point-min))
(when (re-search-forward "^$" nil t)
(let ((cte (save-restriction
(narrow-to-region (point-min) (point))
(mail-fetch-field "content-transfer-encoding"))))
;; Strip MIME headers since it will be ASCII armored.
(forward-line 1)
(delete-region (point-min) (point))
(when cte
(mm-decode-content-transfer-encoding (intern (downcase cte))))))
(unless (let ((pgg-text-mode t))
(pgg-encrypt-region
(point-min) (point-max)
(split-string
(or
(message-options-get 'message-recipients)
(message-options-set 'message-recipients
(read-string "Recipients: ")))
"[ \f\t\n\r\v,]+")
sign))
(pop-to-buffer pgg-errors-buffer)
(error "Encrypt error"))
(delete-region (point-min) (point-max))
(insert "\n")
(insert-buffer-substring pgg-output-buffer)
t)
;; epg wrapper
(defvar epg-user-id-alist)
(autoload 'epg-make-context "epg")
(autoload 'epa-select-keys "epa")
(autoload 'epg-list-keys "epg")
(autoload 'epg-context-set-armor "epg")
(autoload 'epg-context-set-textmode "epg")
(autoload 'epg-context-set-signers "epg")
(autoload 'epg-context-set-passphrase-callback "epg")
(autoload 'epg-key-sub-key-list "epg")
(autoload 'epg-sub-key-capability "epg")
(autoload 'epg-sub-key-validity "epg")
(autoload 'epg-sub-key-fingerprint "epg")
(autoload 'epg-sign-string "epg")
(autoload 'epg-encrypt-string "epg")
(autoload 'epg-configuration "epg-config")
(autoload 'epg-expand-group "epg-config")
(defun mml1991-epg-sign (_cont)
(let (headers cte)
;; Don't sign headers.
(goto-char (point-min))
(when (re-search-forward "^$" nil t)
(setq headers (buffer-substring (point-min) (point)))
(save-restriction
(narrow-to-region (point-min) (point))
(setq cte (mail-fetch-field "content-transfer-encoding")))
(forward-line 1)
(delete-region (point-min) (point))
(when cte
(setq cte (intern (downcase cte)))
(mm-decode-content-transfer-encoding cte)))
(let* ((pair (mml-secure-epg-sign 'OpenPGP 'clear))
(signature (car pair)))
(unless (stringp signature)
(error "Signature failed"))
(delete-region (point-min) (point-max))
(insert
(with-temp-buffer
(set-buffer-multibyte nil)
(insert signature)
(goto-char (point-min))
(while (re-search-forward "\r+$" nil t)
(replace-match "" t t))
(when cte
(mm-encode-content-transfer-encoding cte))
(goto-char (point-min))
(when headers
(insert headers))
(insert "\n")
(buffer-string)))
t)))
(defun mml1991-epg-encrypt (cont &optional sign)
(goto-char (point-min))
(when (re-search-forward "^$" nil t)
(let ((cte (save-restriction
(narrow-to-region (point-min) (point))
(mail-fetch-field "content-transfer-encoding"))))
;; Strip MIME headers since it will be ASCII armored.
(forward-line 1)
(delete-region (point-min) (point))
(when cte
(mm-decode-content-transfer-encoding (intern (downcase cte))))))
(let ((cipher (mml-secure-epg-encrypt 'OpenPGP cont sign)))
(delete-region (point-min) (point-max))
(insert "\n" cipher))
t)
;;;###autoload
(defun mml1991-encrypt (cont &optional sign)
(let ((func (nth 2 (assq mml1991-use mml1991-function-alist))))
(if func
(funcall func cont sign)
(error "Cannot find encrypt function"))))
;;;###autoload
(defun mml1991-sign (cont)
(let ((func (nth 1 (assq mml1991-use mml1991-function-alist))))
(if func
(funcall func cont)
(error "Cannot find sign function"))))
(provide 'mml1991)
;; Local Variables:
;; coding: utf-8
;; End:
;;; mml1991.el ends here
|
