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Diffstat (limited to 'lisp/pgg-gpg.el')
| -rw-r--r-- | lisp/pgg-gpg.el | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/lisp/pgg-gpg.el b/lisp/pgg-gpg.el new file mode 100644 index 00000000000..6ba017c731c --- /dev/null +++ b/lisp/pgg-gpg.el @@ -0,0 +1,275 @@ +;;; pgg-gpg.el --- GnuPG support for PGG. + +;; Copyright (C) 1999, 2000, 2002, 2003, 2004, +;; 2005 Free Software Foundation, Inc. + +;; Author: Daiki Ueno <ueno@unixuser.org> +;; Created: 1999/10/28 +;; Keywords: PGP, OpenPGP, GnuPG + +;; 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., 51 Franklin Street, Fifth Floor, +;; Boston, MA 02110-1301, USA. + +;;; Code: + +(eval-when-compile + (require 'cl) ; for gpg macros + (require 'pgg)) + +(defgroup pgg-gpg () + "GnuPG interface." + :group 'pgg) + +(defcustom pgg-gpg-program "gpg" + "The GnuPG executable." + :group 'pgg-gpg + :type 'string) + +(defcustom pgg-gpg-extra-args nil + "Extra arguments for every GnuPG invocation." + :group 'pgg-gpg + :type '(repeat (string :tag "Argument"))) + +(defcustom pgg-gpg-recipient-argument "--recipient" + "GnuPG option to specify recipient." + :group 'pgg-gpg + :type '(choice (const :tag "New `--recipient' option" "--recipient") + (const :tag "Old `--remote-user' option" "--remote-user"))) + +(defvar pgg-gpg-user-id nil + "GnuPG ID of your default identity.") + +(defun pgg-gpg-process-region (start end passphrase program args) + (let* ((output-file-name (pgg-make-temp-file "pgg-output")) + (args + `("--status-fd" "2" + ,@(if passphrase '("--passphrase-fd" "0")) + "--yes" ; overwrite + "--output" ,output-file-name + ,@pgg-gpg-extra-args ,@args)) + (output-buffer pgg-output-buffer) + (errors-buffer pgg-errors-buffer) + (orig-mode (default-file-modes)) + (process-connection-type nil) + exit-status) + (with-current-buffer (get-buffer-create errors-buffer) + (buffer-disable-undo) + (erase-buffer)) + (unwind-protect + (progn + (set-default-file-modes 448) + (let ((coding-system-for-write 'binary) + (input (buffer-substring-no-properties start end)) + (default-enable-multibyte-characters nil)) + (with-temp-buffer + (when passphrase + (insert passphrase "\n")) + (insert input) + (setq exit-status + (apply #'call-process-region (point-min) (point-max) program + nil errors-buffer nil args)))) + (with-current-buffer (get-buffer-create output-buffer) + (buffer-disable-undo) + (erase-buffer) + (if (file-exists-p output-file-name) + (let ((coding-system-for-read 'raw-text-dos)) + (insert-file-contents output-file-name))) + (set-buffer errors-buffer) + (if (not (equal exit-status 0)) + (insert (format "\n%s exited abnormally: '%s'\n" + program exit-status))))) + (if (file-exists-p output-file-name) + (delete-file output-file-name)) + (set-default-file-modes orig-mode)))) + +(defun pgg-gpg-possibly-cache-passphrase (passphrase &optional key) + (if (and pgg-cache-passphrase + (progn + (goto-char (point-min)) + (re-search-forward "^\\[GNUPG:] \\(GOOD_PASSPHRASE\\>\\)\\|\\(SIG_CREATED\\)" nil t))) + (pgg-add-passphrase-cache + (or key + (progn + (goto-char (point-min)) + (if (re-search-forward + "^\\[GNUPG:] NEED_PASSPHRASE\\(_PIN\\)? \\w+ ?\\w*" nil t) + (substring (match-string 0) -8)))) + passphrase))) + +(defvar pgg-gpg-all-secret-keys 'unknown) + +(defun pgg-gpg-lookup-all-secret-keys () + "Return all secret keys present in secret key ring." + (when (eq pgg-gpg-all-secret-keys 'unknown) + (setq pgg-gpg-all-secret-keys '()) + (let ((args (list "--with-colons" "--no-greeting" "--batch" + "--list-secret-keys"))) + (with-temp-buffer + (apply #'call-process pgg-gpg-program nil t nil args) + (goto-char (point-min)) + (while (re-search-forward + "^\\(sec\\|pub\\):[^:]*:[^:]*:[^:]*:\\([^:]*\\)" nil t) + (push (substring (match-string 2) 8) + pgg-gpg-all-secret-keys))))) + pgg-gpg-all-secret-keys) + +(defun pgg-gpg-lookup-key (string &optional type) + "Search keys associated with STRING." + (let ((args (list "--with-colons" "--no-greeting" "--batch" + (if type "--list-secret-keys" "--list-keys") + string))) + (with-temp-buffer + (apply #'call-process pgg-gpg-program nil t nil args) + (goto-char (point-min)) + (if (re-search-forward "^\\(sec\\|pub\\):[^:]*:[^:]*:[^:]*:\\([^:]*\\)" + nil t) + (substring (match-string 2) 8))))) + +(defun pgg-gpg-encrypt-region (start end recipients &optional sign) + "Encrypt the current region between START and END. +If optional argument SIGN is non-nil, do a combined sign and encrypt." + (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id)) + (passphrase + (when sign + (pgg-read-passphrase + (format "GnuPG passphrase for %s: " pgg-gpg-user-id) + pgg-gpg-user-id))) + (args + (append + (list "--batch" "--armor" "--always-trust" "--encrypt") + (if sign (list "--sign" "--local-user" pgg-gpg-user-id)) + (if recipients + (apply #'nconc + (mapcar (lambda (rcpt) + (list pgg-gpg-recipient-argument rcpt)) + (append recipients + (if pgg-encrypt-for-me + (list pgg-gpg-user-id))))))))) + (pgg-as-lbt start end 'CRLF + (pgg-gpg-process-region start end passphrase pgg-gpg-program args)) + (when sign + (with-current-buffer pgg-errors-buffer + ;; Possibly cache passphrase under, e.g. "jas", for future sign. + (pgg-gpg-possibly-cache-passphrase passphrase pgg-gpg-user-id) + ;; Possibly cache passphrase under, e.g. B565716F, for future decrypt. + (pgg-gpg-possibly-cache-passphrase passphrase))) + (pgg-process-when-success))) + +(defun pgg-gpg-decrypt-region (start end) + "Decrypt the current region between START and END." + (let* ((current-buffer (current-buffer)) + (message-keys (with-temp-buffer + (insert-buffer-substring current-buffer) + (pgg-decode-armor-region (point-min) (point-max)))) + (secret-keys (pgg-gpg-lookup-all-secret-keys)) + (key (pgg-gpg-select-matching-key message-keys secret-keys)) + (pgg-gpg-user-id (or key pgg-gpg-user-id pgg-default-user-id)) + (passphrase + (pgg-read-passphrase + (format "GnuPG passphrase for %s: " pgg-gpg-user-id) + pgg-gpg-user-id)) + (args '("--batch" "--decrypt"))) + (pgg-gpg-process-region start end passphrase pgg-gpg-program args) + (with-current-buffer pgg-errors-buffer + (pgg-gpg-possibly-cache-passphrase passphrase pgg-gpg-user-id) + (goto-char (point-min)) + (re-search-forward "^\\[GNUPG:] DECRYPTION_OKAY\\>" nil t)))) + +(defun pgg-gpg-select-matching-key (message-keys secret-keys) + "Choose a key from MESSAGE-KEYS that matches one of the keys in SECRET-KEYS." + (loop for message-key in message-keys + for message-key-id = (and (equal (car message-key) 1) + (cdr (assq 'key-identifier message-key))) + for key = (and message-key-id (pgg-lookup-key message-key-id 'encrypt)) + when (and key (member key secret-keys)) return key)) + +(defun pgg-gpg-sign-region (start end &optional cleartext) + "Make detached signature from text between START and END." + (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id)) + (passphrase + (pgg-read-passphrase + (format "GnuPG passphrase for %s: " pgg-gpg-user-id) + pgg-gpg-user-id)) + (args + (list (if cleartext "--clearsign" "--detach-sign") + "--armor" "--batch" "--verbose" + "--local-user" pgg-gpg-user-id)) + (inhibit-read-only t) + buffer-read-only) + (pgg-as-lbt start end 'CRLF + (pgg-gpg-process-region start end passphrase pgg-gpg-program args)) + (with-current-buffer pgg-errors-buffer + ;; Possibly cache passphrase under, e.g. "jas", for future sign. + (pgg-gpg-possibly-cache-passphrase passphrase pgg-gpg-user-id) + ;; Possibly cache passphrase under, e.g. B565716F, for future decrypt. + (pgg-gpg-possibly-cache-passphrase passphrase)) + (pgg-process-when-success))) + +(defun pgg-gpg-verify-region (start end &optional signature) + "Verify region between START and END as the detached signature SIGNATURE." + (let ((args '("--batch" "--verify"))) + (when (stringp signature) + (setq args (append args (list signature)))) + (setq args (append args '("-"))) + (pgg-gpg-process-region start end nil pgg-gpg-program args) + (with-current-buffer pgg-errors-buffer + (goto-char (point-min)) + (while (re-search-forward "^gpg: \\(.*\\)\n" nil t) + (with-current-buffer pgg-output-buffer + (insert-buffer-substring pgg-errors-buffer + (match-beginning 1) (match-end 0))) + (delete-region (match-beginning 0) (match-end 0))) + (goto-char (point-min)) + (re-search-forward "^\\[GNUPG:] GOODSIG\\>" nil t)))) + +(defun pgg-gpg-insert-key () + "Insert public key at point." + (let* ((pgg-gpg-user-id (or pgg-gpg-user-id pgg-default-user-id)) + (args (list "--batch" "--export" "--armor" + pgg-gpg-user-id))) + (pgg-gpg-process-region (point)(point) nil pgg-gpg-program args) + (insert-buffer-substring pgg-output-buffer))) + +(defun pgg-gpg-snarf-keys-region (start end) + "Add all public keys in region between START and END to the keyring." + (let ((args '("--import" "--batch" "-")) status) + (pgg-gpg-process-region start end nil pgg-gpg-program args) + (set-buffer pgg-errors-buffer) + (goto-char (point-min)) + (when (re-search-forward "^\\[GNUPG:] IMPORT_RES\\>" nil t) + (setq status (buffer-substring (match-end 0) + (progn (end-of-line)(point))) + status (vconcat (mapcar #'string-to-number (split-string status)))) + (erase-buffer) + (insert (format "Imported %d key(s). +\tArmor contains %d key(s) [%d bad, %d old].\n" + (+ (aref status 2) + (aref status 10)) + (aref status 0) + (aref status 1) + (+ (aref status 4) + (aref status 11))) + (if (zerop (aref status 9)) + "" + "\tSecret keys are imported.\n"))) + (append-to-buffer pgg-output-buffer (point-min)(point-max)) + (pgg-process-when-success))) + +(provide 'pgg-gpg) + +;;; arch-tag: 2aa5d5d8-93a0-4865-9312-33e29830e000 +;;; pgg-gpg.el ends here |