1 ;;; notmuch-crypto.el --- functions for handling display of cryptographic metadata.
3 ;; Copyright © Jameson Rollins
5 ;; This file is part of Notmuch.
7 ;; Notmuch is free software: you can redistribute it and/or modify it
8 ;; under the terms of the GNU General Public License as published by
9 ;; the Free Software Foundation, either version 3 of the License, or
10 ;; (at your option) any later version.
12 ;; Notmuch is distributed in the hope that it will be useful, but
13 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 ;; General Public License for more details.
17 ;; You should have received a copy of the GNU General Public License
18 ;; along with Notmuch. If not, see <https://www.gnu.org/licenses/>.
20 ;; Authors: Jameson Rollins <jrollins@finestructure.net>
25 (require 'notmuch-lib)
27 (defcustom notmuch-crypto-process-mime t
28 "Should cryptographic MIME parts be processed?
30 If this variable is non-nil signatures in multipart/signed
31 messages will be verified and multipart/encrypted parts will be
32 decrypted. The result of the crypto operation will be displayed
33 in a specially colored header button at the top of the processed
34 part. Signed parts will have variously colored headers depending
35 on the success or failure of the verification process and on the
36 validity of user ID of the signer.
38 The effect of setting this variable can be seen temporarily by
39 providing a prefix when viewing a signed or encrypted message, or
40 by providing a prefix when reloading the message in notmuch-show
43 :package-version '(notmuch . "0.25")
44 :group 'notmuch-crypto)
46 (defcustom notmuch-crypto-get-keys-asynchronously t
47 "Retrieve gpg keys asynchronously."
49 :group 'notmuch-crypto)
51 (defcustom notmuch-crypto-gpg-program epg-gpg-program
54 :group 'notmuch-crypto)
56 (defface notmuch-crypto-part-header
59 (:foreground "LightBlue1"))
62 (:foreground "blue")))
63 "Face used for crypto parts headers."
64 :group 'notmuch-crypto
65 :group 'notmuch-faces)
67 (defface notmuch-crypto-signature-good
68 '((t (:background "green" :foreground "black")))
69 "Face used for good signatures."
70 :group 'notmuch-crypto
71 :group 'notmuch-faces)
73 (defface notmuch-crypto-signature-good-key
74 '((t (:background "orange" :foreground "black")))
75 "Face used for good signatures."
76 :group 'notmuch-crypto
77 :group 'notmuch-faces)
79 (defface notmuch-crypto-signature-bad
80 '((t (:background "red" :foreground "black")))
81 "Face used for bad signatures."
82 :group 'notmuch-crypto
83 :group 'notmuch-faces)
85 (defface notmuch-crypto-signature-unknown
86 '((t (:background "red" :foreground "black")))
87 "Face used for signatures of unknown status."
88 :group 'notmuch-crypto
89 :group 'notmuch-faces)
91 (defface notmuch-crypto-decryption
92 '((t (:background "purple" :foreground "black")))
93 "Face used for encryption/decryption status messages."
94 :group 'notmuch-crypto
95 :group 'notmuch-faces)
97 (define-button-type 'notmuch-crypto-status-button-type
98 'action (lambda (button) (message (button-get button 'help-echo)))
100 'help-echo "Set notmuch-crypto-process-mime to process cryptographic mime parts."
101 :supertype 'notmuch-button-type)
103 (defun notmuch-crypto-insert-sigstatus-button (sigstatus from)
104 "Insert a button describing the signature status SIGSTATUS sent
106 (let* ((status (plist-get sigstatus :status))
108 (face 'notmuch-crypto-signature-unknown)
109 (button-action (lambda (button) (message (button-get button 'help-echo))))
110 (keyid (concat "0x" (plist-get sigstatus :keyid)))
113 ((string= status "good")
114 (let ((fingerprint (concat "0x" (plist-get sigstatus :fingerprint)))
115 (userid (plist-get sigstatus :userid)))
116 ;; If userid is present it has full or greater validity.
118 (setq label (concat "Good signature by: " userid)
119 face 'notmuch-crypto-signature-good)
120 (setq label (concat "Good signature by key: " fingerprint)
121 face 'notmuch-crypto-signature-good-key))
122 (setq button-action 'notmuch-crypto-sigstatus-good-callback
123 help-msg (concat "Click to list key ID 0x" fingerprint "."))))
125 ((string= status "error")
126 (setq label (concat "Unknown key ID " keyid " or unsupported algorithm")
127 button-action 'notmuch-crypto-sigstatus-error-callback
128 help-msg (concat "Click to retrieve key ID " keyid
129 " from keyserver.")))
131 ((string= status "bad")
132 (setq label (concat "Bad signature (claimed key ID " keyid ")")
133 face 'notmuch-crypto-signature-bad))
136 (setq label (concat "Unknown signature status: " status)))
138 (setq show-button nil)))
141 (concat "[ " label " ]")
142 :type 'notmuch-crypto-status-button-type
146 'action button-action
147 :notmuch-sigstatus sigstatus
151 (defun notmuch-crypto-sigstatus-good-callback (button)
152 (let* ((id (notmuch-show-get-message-id))
153 (sigstatus (button-get button :notmuch-sigstatus))
154 (fingerprint (concat "0x" (plist-get sigstatus :fingerprint)))
155 (buffer (get-buffer-create "*notmuch-crypto-gpg-out*"))
156 (window (display-buffer buffer)))
157 (with-selected-window window
158 (with-current-buffer buffer
159 (goto-char (point-max))
160 (insert (format "-- Key %s in message %s:\n"
162 (call-process notmuch-crypto-gpg-program nil t t "--batch" "--no-tty" "--list-keys" fingerprint))
165 (declare-function notmuch-show-refresh-view "notmuch-show" (&optional reset-state))
166 (declare-function notmuch-show-get-message-id "notmuch-show" (&optional bare))
168 (defun notmuch-crypto--async-key-sentinel (process event)
169 "When the user asks for a GPG key to be retrieved
170 asynchronously, handle completion of that task.
172 If the retrieval is successful, the thread where the retrieval
173 was initiated is still displayed and the cursor has not moved,
174 redisplay the thread."
175 (let ((status (process-status process))
176 (exit-status (process-exit-status process))
177 (keyid (process-get process :gpg-key-id)))
178 (when (memq status '(exit signal))
179 (message "Getting the GPG key %s asynchronously...%s."
181 (if (= exit-status 0)
184 ;; If the original buffer is still alive and point didn't move
185 ;; (i.e. the user didn't move on or away), refresh the buffer to
186 ;; show the updated signature status.
187 (let ((show-buffer (process-get process :notmuch-show-buffer))
188 (show-point (process-get process :notmuch-show-point)))
189 (when (and (bufferp show-buffer)
190 (buffer-live-p show-buffer)
192 (with-current-buffer show-buffer
194 (with-current-buffer show-buffer
195 (notmuch-show-refresh-view)))))))
197 (defun notmuch-crypto--set-button-label (button label)
198 "Set the text displayed in BUTTON to LABEL."
200 (let ((inhibit-read-only t))
201 ;; This knows rather too much about how we typically format
203 (goto-char (button-start button))
205 (delete-region (point) (- (button-end button) 2))
208 (defun notmuch-crypto-sigstatus-error-callback (button)
209 "When signature validation has failed, try to retrieve the
210 corresponding key when the status button is pressed."
211 (let* ((sigstatus (button-get button :notmuch-sigstatus))
212 (keyid (concat "0x" (plist-get sigstatus :keyid)))
213 (buffer (get-buffer-create "*notmuch-crypto-gpg-out*")))
214 (if notmuch-crypto-get-keys-asynchronously
216 (notmuch-crypto--set-button-label
217 button (format "Retrieving key %s asynchronously..." keyid))
218 (with-current-buffer buffer
219 (goto-char (point-max))
220 (insert (format "--- Retrieving key %s:\n" keyid)))
221 (let ((p (make-process :name "notmuch GPG key retrieval"
222 :connection-type 'pipe
225 :command (list notmuch-crypto-gpg-program "--recv-keys" keyid)
226 :sentinel #'notmuch-crypto--async-key-sentinel)))
227 (process-put p :gpg-key-id keyid)
228 (process-put p :notmuch-show-buffer (current-buffer))
229 (process-put p :notmuch-show-point (point))
230 (message "Getting the GPG key %s asynchronously..." keyid)))
232 (let ((window (display-buffer buffer)))
233 (with-selected-window window
234 (with-current-buffer buffer
235 (goto-char (point-max))
236 (insert (format "--- Retrieving key %s:\n" keyid))
237 (call-process notmuch-crypto-gpg-program nil t t "--recv-keys" keyid)
239 (call-process notmuch-crypto-gpg-program nil t t "--list-keys" keyid))
241 (notmuch-show-refresh-view)))))
243 (defun notmuch-crypto-insert-encstatus-button (encstatus)
244 "Insert a button describing the encryption status ENCSTATUS."
247 (let ((status (plist-get encstatus :status)))
249 ((string= status "good")
250 "Decryption successful")
251 ((string= status "bad")
254 (concat "Unknown encryption status"
255 (if status (concat ": " status))))))
257 :type 'notmuch-crypto-status-button-type
258 'face 'notmuch-crypto-decryption
259 'mouse-face 'notmuch-crypto-decryption)
264 (provide 'notmuch-crypto)
266 ;;; notmuch-crypto.el ends here