bc511a64f6
Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
252 lines
8.3 KiB
EmacsLisp
252 lines
8.3 KiB
EmacsLisp
;;; epa-mail.el --- the EasyPG Assistant, minor-mode for mail composer -*- lexical-binding: t -*-
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;; Copyright (C) 2006-2017 Free Software Foundation, Inc.
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;; Author: Daiki Ueno <ueno@unixuser.org>
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;; Keywords: PGP, GnuPG, mail, message
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;; Package: epa
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Code:
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(require 'epa)
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(require 'mail-utils)
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(defvar epa-mail-mode-map
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(let ((keymap (make-sparse-keymap)))
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(define-key keymap "\C-c\C-ed" 'epa-mail-decrypt)
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(define-key keymap "\C-c\C-ev" 'epa-mail-verify)
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(define-key keymap "\C-c\C-es" 'epa-mail-sign)
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(define-key keymap "\C-c\C-ee" 'epa-mail-encrypt)
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(define-key keymap "\C-c\C-ei" 'epa-mail-import-keys)
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(define-key keymap "\C-c\C-eo" 'epa-insert-keys)
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(define-key keymap "\C-c\C-e\C-d" 'epa-mail-decrypt)
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(define-key keymap "\C-c\C-e\C-v" 'epa-mail-verify)
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(define-key keymap "\C-c\C-e\C-s" 'epa-mail-sign)
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(define-key keymap "\C-c\C-e\C-e" 'epa-mail-encrypt)
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(define-key keymap "\C-c\C-e\C-i" 'epa-mail-import-keys)
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(define-key keymap "\C-c\C-e\C-o" 'epa-insert-keys)
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keymap))
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(defvar epa-mail-mode-hook nil)
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(defvar epa-mail-mode-on-hook nil)
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(defvar epa-mail-mode-off-hook nil)
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;;;###autoload
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(define-minor-mode epa-mail-mode
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"A minor-mode for composing encrypted/clearsigned mails.
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With a prefix argument ARG, enable the mode if ARG is positive,
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and disable it otherwise. If called from Lisp, enable the mode
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if ARG is omitted or nil."
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nil " epa-mail" epa-mail-mode-map)
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(defun epa-mail--find-usable-key (keys usage)
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"Find a usable key from KEYS for USAGE.
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USAGE would be `sign' or `encrypt'."
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(catch 'found
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(while keys
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(let ((pointer (epg-key-sub-key-list (car keys))))
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(while pointer
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(if (and (memq usage (epg-sub-key-capability (car pointer)))
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(not (memq (epg-sub-key-validity (car pointer))
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'(revoked expired))))
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(throw 'found (car keys)))
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(setq pointer (cdr pointer))))
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(setq keys (cdr keys)))))
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;;;###autoload
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(defun epa-mail-decrypt ()
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"Decrypt OpenPGP armors in the current buffer.
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The buffer is expected to contain a mail message."
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(declare (interactive-only t))
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(interactive)
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(epa-decrypt-armor-in-region (point-min) (point-max)))
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;;;###autoload
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(defun epa-mail-verify ()
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"Verify OpenPGP cleartext signed messages in the current buffer.
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The buffer is expected to contain a mail message."
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(declare (interactive-only t))
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(interactive)
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(epa-verify-cleartext-in-region (point-min) (point-max)))
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;;;###autoload
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(defun epa-mail-sign (start end signers mode)
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"Sign the current buffer.
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The buffer is expected to contain a mail message."
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(declare (interactive-only t))
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(interactive
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(save-excursion
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(goto-char (point-min))
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(if (search-forward mail-header-separator nil t)
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(forward-line))
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(setq epa-last-coding-system-specified
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(or coding-system-for-write
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(epa--select-safe-coding-system (point) (point-max))))
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(let ((verbose current-prefix-arg))
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(list (point) (point-max)
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(if verbose
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(epa-select-keys (epg-make-context epa-protocol)
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"Select keys for signing.
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If no one is selected, default secret key is used. "
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nil t))
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(if verbose
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(epa--read-signature-type)
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'clear)))))
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(let ((inhibit-read-only t))
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(epa-sign-region start end signers mode)))
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(defun epa-mail-default-recipients ()
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"Return the default list of encryption recipients for a mail buffer."
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(let ((config (epg-configuration))
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recipients-string real-recipients)
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(save-excursion
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(goto-char (point-min))
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(save-restriction
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(narrow-to-region (point)
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(if (search-forward mail-header-separator nil 0)
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(match-beginning 0)
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(point)))
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(setq recipients-string
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(mapconcat #'identity
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(nconc (mail-fetch-field "to" nil nil t)
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(mail-fetch-field "cc" nil nil t)
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(mail-fetch-field "bcc" nil nil t))
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","))
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(setq recipients-string
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(mail-strip-quoted-names
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(with-temp-buffer
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(insert "to: " recipients-string "\n")
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(expand-mail-aliases (point-min) (point-max))
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(car (mail-fetch-field "to" nil nil t))))))
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(setq real-recipients
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(split-string recipients-string "," t "[ \t\n]*"))
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;; Process all the recipients thru the list of GnuPG groups.
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;; Expand GnuPG group names to what they stand for.
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(setq real-recipients
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(apply #'nconc
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(mapcar
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(lambda (recipient)
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(or (epg-expand-group config recipient)
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(list recipient)))
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real-recipients)))
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;; Process all the recipients thru the user's list
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;; of encryption aliases.
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(setq real-recipients
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(apply #'nconc
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(mapcar
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(lambda (recipient)
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(let ((tem (assoc recipient epa-mail-aliases)))
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(if tem (cdr tem)
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(list recipient))))
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real-recipients)))
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)))
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;;;###autoload
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(defun epa-mail-encrypt (&optional recipients signers)
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"Encrypt the outgoing mail message in the current buffer.
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Takes the recipients from the text in the header in the buffer
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and translates them through `epa-mail-aliases'.
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With prefix argument, asks you to select among them interactively
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and also whether and how to sign.
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Called from Lisp, the optional argument RECIPIENTS is a list
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of recipient addresses, t to perform symmetric encryption,
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or nil meaning use the defaults.
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SIGNERS is a list of keys to sign the message with."
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(interactive
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(let ((verbose current-prefix-arg)
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(context (epg-make-context epa-protocol)))
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(list (if verbose
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(or (epa-select-keys
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context
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"Select recipients for encryption.
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If no one is selected, symmetric encryption will be performed. "
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(epa-mail-default-recipients))
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t))
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(and verbose (y-or-n-p "Sign? ")
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(epa-select-keys context
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"Select keys for signing. ")))))
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(let (start recipient-keys default-recipients)
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(save-excursion
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(setq recipient-keys
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(cond ((eq recipients t)
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nil)
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(recipients recipients)
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(t
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(setq default-recipients
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(epa-mail-default-recipients))
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;; Convert recipients to keys.
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(apply
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'nconc
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(mapcar
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(lambda (recipient)
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(let ((recipient-key
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(epa-mail--find-usable-key
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(epg-list-keys
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(epg-make-context epa-protocol)
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(if (string-match "@" recipient)
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(concat "<" recipient ">")
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recipient))
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'encrypt)))
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(unless (or recipient-key
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(y-or-n-p
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(format
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"No public key for %s; skip it? "
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recipient)))
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(error "No public key for %s" recipient))
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(if recipient-key (list recipient-key))))
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default-recipients)))))
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(goto-char (point-min))
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(if (search-forward mail-header-separator nil t)
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(forward-line))
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(setq start (point))
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(setq epa-last-coding-system-specified
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(or coding-system-for-write
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(epa--select-safe-coding-system (point) (point-max)))))
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;; Don't let some read-only text stop us from encrypting.
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(let ((inhibit-read-only t))
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(epa-encrypt-region start (point-max) recipient-keys signers signers))))
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;;;###autoload
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(defun epa-mail-import-keys ()
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"Import keys in the OpenPGP armor format in the current buffer.
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The buffer is expected to contain a mail message."
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(declare (interactive-only t))
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(interactive)
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(epa-import-armor-in-region (point-min) (point-max)))
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;;;###autoload
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(define-minor-mode epa-global-mail-mode
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"Minor mode to hook EasyPG into Mail mode.
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With a prefix argument ARG, enable the mode if ARG is positive,
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and disable it otherwise. If called from Lisp, enable the mode
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if ARG is omitted or nil."
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:global t :init-value nil :group 'epa-mail :version "23.1"
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(remove-hook 'mail-mode-hook 'epa-mail-mode)
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(if epa-global-mail-mode
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(add-hook 'mail-mode-hook 'epa-mail-mode)))
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(provide 'epa-mail)
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;;; epa-mail.el ends here
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