1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279
|
;;; epa-mail.el --- the EasyPG Assistant, minor-mode for mail composer -*- lexical-binding: t -*-
;; Copyright (C) 2006-2025 Free Software Foundation, Inc.
;; Author: Daiki Ueno <ueno@unixuser.org>
;; Keywords: PGP, GnuPG, mail, message
;; Package: epa
;; 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:
(require 'epa)
(require 'mail-utils)
;;; Local Mode
(defvar-keymap epa-mail-mode-map
"C-c C-e d" #'epa-mail-decrypt
"C-c C-e v" #'epa-mail-verify
"C-c C-e s" #'epa-mail-sign
"C-c C-e e" #'epa-mail-encrypt
"C-c C-e i" #'epa-mail-import-keys
"C-c C-e o" #'epa-insert-keys
"C-c C-e C-d" #'epa-mail-decrypt
"C-c C-e C-v" #'epa-mail-verify
"C-c C-e C-s" #'epa-mail-sign
"C-c C-e C-e" #'epa-mail-encrypt
"C-c C-e C-i" #'epa-mail-import-keys
"C-c C-e C-o" #'epa-insert-keys)
(defvar epa-mail-mode-hook nil)
(defvar epa-mail-mode-on-hook nil)
(defvar epa-mail-mode-off-hook nil)
(defcustom epa-mail-offer-skip t
"If non-nil, when a recipient has no key, ask whether to skip it.
Otherwise, signal an error."
:type 'boolean
:version "28.1"
:group 'epa-mail)
;;;###autoload
(define-minor-mode epa-mail-mode
"A minor-mode for composing encrypted/clearsigned mails."
:lighter " epa-mail")
;;; Utilities
(defun epa-mail--find-usable-key (keys usage)
"Find a usable key from KEYS for USAGE.
USAGE would be `sign' or `encrypt'."
(catch 'found
(while keys
(let ((pointer (epg-key-sub-key-list (car keys))))
(while pointer
(if (and (memq usage (epg-sub-key-capability (car pointer)))
(not (memq (epg-sub-key-validity (car pointer))
'(revoked expired))))
(throw 'found (car keys)))
(setq pointer (cdr pointer))))
(setq keys (cdr keys)))))
;;; Commands
;;;###autoload
(defun epa-mail-decrypt ()
"Decrypt OpenPGP armors in the current buffer.
The buffer is expected to contain a mail message."
(declare (interactive-only t))
(interactive)
(with-suppressed-warnings ((interactive-only epa-decrypt-armor-in-region))
(epa-decrypt-armor-in-region (point-min) (point-max))))
;;;###autoload
(defun epa-mail-verify ()
"Verify OpenPGP cleartext signed messages in the current buffer.
The buffer is expected to contain a mail message.
If the verification fails, signal an error."
(declare (interactive-only t))
(interactive)
(with-suppressed-warnings ((interactive-only epa-verify-cleartext-in-region))
(epa-verify-cleartext-in-region (point-min) (point-max))))
;;;###autoload
(defun epa-mail-sign (start end signers mode)
"Sign the current buffer.
The buffer is expected to contain a mail message, and signing is
performed with your default key.
With prefix argument, asks you to select interactively the key to
use from your key ring."
(declare (interactive-only t))
(interactive
(save-excursion
(goto-char (point-min))
(rfc822-goto-eoh)
(unless (eobp)
(forward-line))
(setq epa-last-coding-system-specified
(or coding-system-for-write
(select-safe-coding-system (point) (point-max))))
(let ((verbose current-prefix-arg))
(list (point) (point-max)
(if verbose
(epa-select-keys (epg-make-context epa-protocol)
"Select keys for signing.
If no one is selected, default secret key is used. "
nil t))
(if verbose
(epa--read-signature-type)
'clear)))))
(let ((inhibit-read-only t))
(with-suppressed-warnings ((interactive-only epa-sign-region))
(epa-sign-region start end signers mode))))
(defun epa-mail-default-recipients ()
"Return the default list of encryption recipients for a mail buffer."
(let ((config (epg-find-configuration 'OpenPGP))
recipients-string real-recipients)
(save-excursion
(goto-char (point-min))
(save-restriction
(narrow-to-region (point)
(progn (rfc822-goto-eoh) (point)))
(setq recipients-string
(mapconcat #'identity
(nconc (mail-fetch-field "to" nil nil t)
(mail-fetch-field "cc" nil nil t)
(mail-fetch-field "bcc" nil nil t))
","))
(setq recipients-string
(mail-strip-quoted-names
(with-temp-buffer
(insert "to: " recipients-string "\n")
(expand-mail-aliases (point-min) (point-max))
(car (mail-fetch-field "to" nil nil t))))))
(setq real-recipients
(split-string recipients-string "," t "[ \t\n]*"))
;; Process all the recipients thru the list of GnuPG groups.
;; Expand GnuPG group names to what they stand for.
(setq real-recipients
(apply #'nconc
(mapcar
(lambda (recipient)
(or (epg-expand-group config recipient)
(list recipient)))
real-recipients)))
;; Process all the recipients thru the user's list
;; of encryption aliases.
(setq real-recipients
(apply #'nconc
(mapcar
(lambda (recipient)
(let ((tem (assoc (downcase recipient) epa-mail-aliases)))
(if tem (copy-sequence (cdr tem))
(list recipient))))
real-recipients)))
)))
;;;###autoload
(defun epa-mail-encrypt (&optional recipients signers)
"Encrypt the outgoing mail message in the current buffer.
Takes the recipients from the text in the header in the buffer
and translates them through `epa-mail-aliases'.
With prefix argument, asks you to select among them interactively
and also whether and how to sign.
Called from Lisp, the optional argument RECIPIENTS is a list
of recipient addresses, t to perform symmetric encryption,
or nil meaning use the defaults.
SIGNERS is a list of keys to sign the message with."
(interactive
(let ((verbose current-prefix-arg)
(context (epg-make-context epa-protocol)))
(list (if verbose
(or (epa-select-keys
context
"Select recipients for encryption.
If no one is selected, symmetric encryption will be performed. "
(epa-mail-default-recipients))
t))
(and verbose (y-or-n-p "Sign? ")
(epa-select-keys context
"Select keys for signing. ")))))
(let (start recipient-keys default-recipients)
(save-excursion
(setq recipient-keys
(cond ((eq recipients t)
nil)
(recipients recipients)
(t
(setq default-recipients
(epa-mail-default-recipients))
;; Convert recipients to keys.
(apply
'nconc
(mapcar
(lambda (recipient)
(let ((recipient-key
(epa-mail--find-usable-key
(epg-list-keys
(epg-make-context epa-protocol)
(if (string-search "@" recipient)
(concat "<" recipient ">")
recipient))
'encrypt)))
(unless (or recipient-key
(and epa-mail-offer-skip
(y-or-n-p
(format
"No public key for %s; skip it? "
recipient)))
)
(error "No public key for %s" recipient))
(if recipient-key (list recipient-key))))
default-recipients)))))
(goto-char (point-min))
(rfc822-goto-eoh)
(unless (eobp)
(forward-line))
(setq start (point))
(setq epa-last-coding-system-specified
(or coding-system-for-write
(select-safe-coding-system (point) (point-max)))))
;; Insert contents of requested attachments, if any.
(when (and (eq major-mode 'mail-mode) mail-encode-mml)
(mml-to-mime)
(setq mail-encode-mml nil))
;; Don't let some read-only text stop us from encrypting.
(let ((inhibit-read-only t))
(with-suppressed-warnings ((interactive-only epa-encrypt-region))
(epa-encrypt-region start (point-max)
recipient-keys signers signers)))))
;;;###autoload
(defun epa-mail-import-keys ()
"Import keys in the OpenPGP armor format in the current buffer.
The buffer is expected to contain a mail message."
(declare (interactive-only t))
(interactive)
(epa-import-armor-in-region (point-min) (point-max)))
;;; Global Mode
;;;###autoload
(define-minor-mode epa-global-mail-mode
"Minor mode to hook EasyPG into Mail mode."
:global t :init-value nil :group 'epa-mail :version "23.1"
(remove-hook 'mail-mode-hook 'epa-mail-mode)
(if epa-global-mail-mode
(add-hook 'mail-mode-hook 'epa-mail-mode)))
(provide 'epa-mail)
;;; epa-mail.el ends here
|