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7e5c0263fc
* lisp/org-crypt.el (org-crypt-check-auto-save): New function, see next change. * lisp/org-crypt.el (org-decrypt-entry): Break the auto-save-mode check out into a separate function, and call it at a later point, to assure it only runs when visiting an encrypted entry. Currently `org-decrypt-entry' is doing the auto-save-mode check whenever it's run, regardless of context, while this only makes sense when run on an entry which is actually encrypted (or looks like it, at least). TINYCHANGE
261 lines
9.3 KiB
EmacsLisp
261 lines
9.3 KiB
EmacsLisp
;;; org-crypt.el --- Public key encryption for org-mode entries
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;; Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
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;; Emacs Lisp Archive Entry
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;; Filename: org-crypt.el
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;; Keywords: org-mode
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;; Author: John Wiegley <johnw@gnu.org>
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;; Maintainer: Peter Jones <pjones@pmade.com>
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;; Description: Adds public key encryption to org-mode buffers
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;; URL: http://www.newartisans.com/software/emacs.html
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;; Compatibility: Emacs22
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;; This file is part of GNU Emacs.
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;;
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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 <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Right now this is just a set of functions to play with. It depends
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;; on the epg library. Here's how you would use it:
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;;
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;; 1. To mark an entry for encryption, tag the heading with "crypt".
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;; You can change the tag to any complex tag matching string by
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;; setting the `org-crypt-tag-matcher' variable.
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;;
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;; 2. Set the encryption key to use in the `org-crypt-key' variable,
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;; or use `M-x org-set-property' to set the property CRYPTKEY to
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;; any address in your public keyring. The text of the entry (but
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;; not its properties or headline) will be encrypted for this user.
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;; For them to read it, the corresponding secret key must be
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;; located in the secret key ring of the account where you try to
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;; decrypt it. This makes it possible to leave secure notes that
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;; only the intended recipient can read in a shared-org-mode-files
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;; scenario.
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;; If the key is not set, org-crypt will default to symmetric encryption.
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;;
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;; 3. To later decrypt an entry, use `org-decrypt-entries' or
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;; `org-decrypt-entry'. It might be useful to bind this to a key,
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;; like C-c C-/. I hope that in the future, C-c C-r can be might
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;; overloaded to also decrypt an entry if it's encrypted, since
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;; that fits nicely with the meaning of "reveal".
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;;
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;; 4. To automatically encrypt all necessary entries when saving a
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;; file, call `org-crypt-use-before-save-magic' after loading
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;; org-crypt.el.
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;;; Thanks:
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;; - Carsten Dominik
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;; - Vitaly Ostanin
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(require 'org)
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;;; Code:
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(declare-function epg-decrypt-string "epg" (context cipher))
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(declare-function epg-list-keys "epg" (context &optional name mode))
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(declare-function epg-make-context "epg"
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(&optional protocol armor textmode include-certs
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cipher-algorithm digest-algorithm
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compress-algorithm))
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(declare-function epg-encrypt-string "epg"
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(context plain recipients &optional sign always-trust))
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(defgroup org-crypt nil
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"Org Crypt"
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:tag "Org Crypt"
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:group 'org)
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(defcustom org-crypt-tag-matcher "crypt"
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"The tag matcher used to find headings whose contents should be encrypted.
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See the \"Match syntax\" section of the org manual for more details."
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:type 'string
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:group 'org-crypt)
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(defcustom org-crypt-key ""
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"The default key to use when encrypting the contents of a heading.
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This setting can also be overridden in the CRYPTKEY property."
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:type 'string
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:group 'org-crypt)
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(defcustom org-crypt-disable-auto-save 'ask
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"What org-decrypt should do if `auto-save-mode' is enabled.
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t : Disable auto-save-mode for the current buffer
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prior to decrypting an entry.
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nil : Leave auto-save-mode enabled.
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This may cause data to be written to disk unencrypted!
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'ask : Ask user whether or not to disable auto-save-mode
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for the current buffer.
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'encrypt : Leave auto-save-mode enabled for the current buffer,
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but automatically re-encrypt all decrypted entries
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*before* auto-saving.
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NOTE: This only works for entries which have a tag
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that matches `org-crypt-tag-matcher'."
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:group 'org-crypt
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:type '(choice (const :tag "Always" t)
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(const :tag "Never" nil)
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(const :tag "Ask" ask)
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(const :tag "Encrypt" encrypt)))
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(defun org-crypt-check-auto-save ()
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"Check whether auto-save-mode is enabled for the current buffer.
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`auto-save-mode' may cause leakage when decrypting entries, so
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check whether it's enabled, and decide what to do about it.
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See `org-crypt-disable-auto-save'."
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(when buffer-auto-save-file-name
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(cond
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((or
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(eq org-crypt-disable-auto-save t)
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(and
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(eq org-crypt-disable-auto-save 'ask)
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(y-or-n-p "org-decrypt: auto-save-mode may cause leakage. Disable it for current buffer? ")))
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(message (concat "org-decrypt: Disabling auto-save-mode for " (or (buffer-file-name) (current-buffer))))
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; The argument to auto-save-mode has to be "-1", since
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; giving a "nil" argument toggles instead of disabling.
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(auto-save-mode -1))
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((eq org-crypt-disable-auto-save nil)
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(message "org-decrypt: Decrypting entry with auto-save-mode enabled. This may cause leakage."))
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((eq org-crypt-disable-auto-save 'encrypt)
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(message "org-decrypt: Enabling re-encryption on auto-save.")
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(add-hook 'auto-save-hook
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(lambda ()
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(message "org-crypt: Re-encrypting all decrypted entries due to auto-save.")
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(org-encrypt-entries))
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nil t))
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(t nil))))
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(defun org-crypt-key-for-heading ()
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"Return the encryption key for the current heading."
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(save-excursion
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(org-back-to-heading t)
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(or (org-entry-get nil "CRYPTKEY" 'selective)
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org-crypt-key
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(and (boundp 'epa-file-encrypt-to) epa-file-encrypt-to)
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(message "No crypt key set, using symmetric encryption."))))
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(defun org-encrypt-string (str crypt-key)
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"Return STR encrypted with CRYPT-KEY."
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;; Text and key have to be identical, otherwise we re-crypt.
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(if (and (string= crypt-key (get-text-property 0 'org-crypt-key str))
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(string= (sha1 str) (get-text-property 0 'org-crypt-checksum str)))
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(get-text-property 0 'org-crypt-text str)
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(let ((epg-context (epg-make-context nil t t)))
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(epg-encrypt-string epg-context str (epg-list-keys epg-context crypt-key)))))
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(defun org-encrypt-entry ()
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"Encrypt the content of the current headline."
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(interactive)
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(require 'epg)
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(save-excursion
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(org-back-to-heading t)
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(let ((start-heading (point)))
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(forward-line)
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(when (not (looking-at "-----BEGIN PGP MESSAGE-----"))
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(let ((folded (outline-invisible-p))
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(epg-context (epg-make-context nil t t))
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(crypt-key (org-crypt-key-for-heading))
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(beg (point))
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end encrypted-text)
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(goto-char start-heading)
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(org-end-of-subtree t t)
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(org-back-over-empty-lines)
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(setq end (point)
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encrypted-text
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(org-encrypt-string (buffer-substring beg end) crypt-key))
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(delete-region beg end)
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(insert encrypted-text)
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(when folded
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(goto-char start-heading)
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(hide-subtree))
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nil)))))
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(defun org-decrypt-entry ()
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"Decrypt the content of the current headline."
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(interactive)
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(require 'epg)
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(unless (org-before-first-heading-p)
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(save-excursion
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(org-back-to-heading t)
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(let ((heading-point (point))
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(heading-was-invisible-p
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(save-excursion
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(outline-end-of-heading)
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(outline-invisible-p))))
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(forward-line)
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(when (looking-at "-----BEGIN PGP MESSAGE-----")
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(org-crypt-check-auto-save)
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(let* ((end (save-excursion
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(search-forward "-----END PGP MESSAGE-----")
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(forward-line)
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(point)))
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(epg-context (epg-make-context nil t t))
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(encrypted-text (buffer-substring-no-properties (point) end))
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(decrypted-text
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(decode-coding-string
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(epg-decrypt-string
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epg-context
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encrypted-text)
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'utf-8)))
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;; Delete region starting just before point, because the
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;; outline property starts at the \n of the heading.
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(delete-region (1- (point)) end)
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;; Store a checksum of the decrypted and the encrypted
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;; text value. This allow to reuse the same encrypted text
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;; if the text does not change, and therefore avoid a
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;; re-encryption process.
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(insert "\n" (propertize decrypted-text
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'org-crypt-checksum (sha1 decrypted-text)
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'org-crypt-key (org-crypt-key-for-heading)
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'org-crypt-text encrypted-text))
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(when heading-was-invisible-p
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(goto-char heading-point)
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(org-flag-subtree t))
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nil))))))
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(defun org-encrypt-entries ()
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"Encrypt all top-level entries in the current buffer."
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(interactive)
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(org-scan-tags
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'org-encrypt-entry
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(cdr (org-make-tags-matcher org-crypt-tag-matcher))))
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(defun org-decrypt-entries ()
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"Decrypt all entries in the current buffer."
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(interactive)
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(org-scan-tags
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'org-decrypt-entry
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(cdr (org-make-tags-matcher org-crypt-tag-matcher))))
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(defun org-crypt-use-before-save-magic ()
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"Add a hook to automatically encrypt entries before a file is saved to disk."
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(add-hook
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'org-mode-hook
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(lambda () (add-hook 'before-save-hook 'org-encrypt-entries nil t))))
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(add-hook 'org-reveal-start-hook 'org-decrypt-entry)
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(provide 'org-crypt)
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;;; org-crypt.el ends here
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