--- /dev/null
+;;; pgg.el --- glue for the various PGP implementations.
+
+;; Copyright (C) 1999,2000 Daiki Ueno
+
+;; Author: Daiki Ueno <ueno@ueda.info.waseda.ac.jp>
+;; Created: 1999/10/28
+;; Keywords: PGP
+
+;; This file is part of SEMI (Secure Emacs MIME Interface).
+
+;; This program 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.
+
+;; This program 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., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+
+;;; Commentary:
+;;
+
+;;; Code:
+
+(require 'calist)
+
+(eval-and-compile (require 'luna))
+
+(require 'pgg-def)
+(require 'pgg-parse)
+
+(eval-when-compile
+ (ignore-errors
+ (require 'w3)
+ (require 'url)))
+
+(in-calist-package 'pgg)
+
+(defun pgg-field-match-method-with-containment
+ (calist field-type field-value)
+ (let ((s-field (assq field-type calist)))
+ (cond ((null s-field)
+ (cons (cons field-type field-value) calist))
+ ((memq (cdr s-field) field-value)
+ calist))))
+
+(define-calist-field-match-method 'signature-version
+ #'pgg-field-match-method-with-containment)
+
+(define-calist-field-match-method 'symmetric-key-algorithm
+ #'pgg-field-match-method-with-containment)
+
+(define-calist-field-match-method 'public-key-algorithm
+ #'pgg-field-match-method-with-containment)
+
+(define-calist-field-match-method 'hash-algorithm
+ #'pgg-field-match-method-with-containment)
+
+(defvar pgg-verify-condition nil
+ "Condition-tree about which PGP implementation is used for verifying.")
+
+(defvar pgg-decrypt-condition nil
+ "Condition-tree about which PGP implementation is used for decrypting.")
+
+(ctree-set-calist-strictly
+ 'pgg-verify-condition
+ '((signature-version 3)(public-key-algorithm RSA)(hash-algorithm MD5)
+ (scheme . pgp)))
+
+(ctree-set-calist-strictly
+ 'pgg-decrypt-condition
+ '((public-key-algorithm RSA)(symmetric-key-algorithm IDEA)
+ (scheme . pgp)))
+
+(ctree-set-calist-strictly
+ 'pgg-verify-condition
+ '((signature-version 3 4)
+ (public-key-algorithm RSA ELG DSA)
+ (hash-algorithm MD5 SHA1 RIPEMD160)
+ (scheme . pgp5)))
+
+(ctree-set-calist-strictly
+ 'pgg-decrypt-condition
+ '((public-key-algorithm RSA ELG DSA)
+ (symmetric-key-algorithm 3DES CAST5 IDEA)
+ (scheme . pgp5)))
+
+(ctree-set-calist-strictly
+ 'pgg-verify-condition
+ '((signature-version 3 4)
+ (public-key-algorithm ELG-E DSA ELG)
+ (hash-algorithm MD5 SHA1 RIPEMD160)
+ (scheme . gpg)))
+
+(ctree-set-calist-strictly
+ 'pgg-decrypt-condition
+ '((public-key-algorithm ELG-E DSA ELG)
+ (symmetric-key-algorithm 3DES CAST5 BLOWFISH TWOFISH)
+ (scheme . gpg)))
+
+;;; @ definition of the implementation scheme
+;;;
+
+(eval-and-compile
+ (luna-define-class pgg-scheme ())
+
+ (luna-define-internal-accessors 'pgg-scheme))
+
+(luna-define-generic pgg-scheme-lookup-key (scheme string &optional type)
+ "Search keys associated with STRING")
+
+(luna-define-generic pgg-scheme-encrypt-region (scheme start end recipients)
+ "Encrypt the current region between START and END.")
+
+(luna-define-generic pgg-scheme-decrypt-region (scheme start end)
+ "Decrypt the current region between START and END.")
+
+(luna-define-generic pgg-scheme-sign-region
+ (scheme start end &optional cleartext)
+ "Make detached signature from text between START and END.")
+
+(luna-define-generic pgg-scheme-verify-region
+ (scheme start end &optional signature)
+ "Verify region between START and END
+as the detached signature SIGNATURE.")
+
+(luna-define-generic pgg-scheme-insert-key (scheme)
+ "Insert public key at point.")
+
+(luna-define-generic pgg-scheme-snarf-keys-region (scheme start end)
+ "Add all public keys in region between START
+and END to the keyring.")
+
+;;; @ utility functions
+;;;
+
+(defvar pgg-fetch-key-function (function pgg-fetch-key-with-w3))
+
+(defmacro pgg-make-scheme (scheme)
+ `(progn
+ (require (intern (format "pgg-%s" ,scheme)))
+ (funcall (intern (format "pgg-make-scheme-%s"
+ ,scheme)))))
+
+(put 'pgg-save-coding-system 'lisp-indent-function 2)
+
+(defmacro pgg-save-coding-system (start end &rest body)
+ `(if (interactive-p)
+ (let ((buffer (current-buffer)))
+ (with-temp-buffer
+ (let (buffer-undo-list)
+ (insert-buffer-substring buffer ,start ,end)
+ (encode-coding-region (point-min)(point-max)
+ buffer-file-coding-system)
+ (prog1 (save-excursion ,@body)
+ (push nil buffer-undo-list)
+ (ignore-errors (undo))))))
+ (save-restriction
+ (narrow-to-region ,start ,end)
+ ,@body)))
+
+(defun pgg-temp-buffer-show-function (buffer)
+ (let ((window (split-window-vertically
+ (- (window-height)
+ (/ (window-height) 5)))))
+ (set-window-buffer window buffer)))
+
+(defun pgg-display-output-buffer (start end status)
+ (if status
+ (progn
+ (delete-region start end)
+ (insert-buffer-substring pgg-output-buffer)
+ (decode-coding-region start (point) buffer-file-coding-system))
+ (let ((temp-buffer-show-function
+ (function pgg-temp-buffer-show-function)))
+ (with-output-to-temp-buffer pgg-echo-buffer
+ (set-buffer standard-output)
+ (insert-buffer-substring pgg-errors-buffer)))))
+
+(defvar pgg-passphrase-cache-expiry 16)
+(defvar pgg-passphrase-cache (make-vector 7 0))
+
+(defvar pgg-read-passphrase nil)
+(defun pgg-read-passphrase (prompt &optional key)
+ (if (not pgg-read-passphrase)
+ (if (functionp 'read-passwd)
+ (setq pgg-read-passphrase 'read-passwd)
+ (if (load "passwd" t)
+ (setq pgg-read-passphrase 'read-passwd)
+ (autoload 'ange-ftp-read-passwd "ange-ftp")
+ (setq pgg-read-passphrase 'ange-ftp-read-passwd))))
+ (or (and pgg-cache-passphrase
+ key (setq key (pgg-truncate-key-identifier key))
+ (symbol-value (intern-soft key pgg-passphrase-cache)))
+ (funcall pgg-read-passphrase prompt)))
+
+(defun pgg-add-passphrase-cache (key passphrase)
+ (setq key (pgg-truncate-key-identifier key))
+ (set (intern key pgg-passphrase-cache)
+ passphrase)
+ (run-at-time pgg-passphrase-cache-expiry nil
+ #'pgg-remove-passphrase-cache
+ key))
+
+(defun pgg-remove-passphrase-cache (key)
+ (let ((passphrase (symbol-value (intern-soft key pgg-passphrase-cache))))
+ (when passphrase
+ (fillarray passphrase ?_)
+ (unintern key pgg-passphrase-cache))))
+
+(defmacro pgg-convert-lbt-region (start end lbt)
+ `(let ((pgg-conversion-end (set-marker (make-marker) ,end)))
+ (goto-char ,start)
+ (case ,lbt
+ (CRLF
+ (while (progn
+ (end-of-line)
+ (> (marker-position pgg-conversion-end) (point)))
+ (insert "\r")
+ (forward-line 1)))
+ (LF
+ (while (re-search-forward "\r$" pgg-conversion-end t)
+ (replace-match ""))))))
+
+(put 'pgg-as-lbt 'lisp-indent-function 3)
+
+(defmacro pgg-as-lbt (start end lbt &rest body)
+ `(let ((inhibit-read-only t)
+ buffer-read-only
+ buffer-undo-list)
+ (pgg-convert-lbt-region ,start ,end ,lbt)
+ (let ((,end (point)))
+ ,@body)
+ (push nil buffer-undo-list)
+ (ignore-errors (undo))))
+
+(put 'pgg-process-when-success 'lisp-indent-function 0)
+
+(defmacro pgg-process-when-success (&rest body)
+ `(with-current-buffer pgg-output-buffer
+ (if (zerop (buffer-size)) nil ,@body t)))
+
+
+;;; @ interface functions
+;;;
+
+;;;###autoload
+(defun pgg-encrypt-region (start end rcpts)
+ "Encrypt the current region between START and END for RCPTS."
+ (interactive
+ (list (region-beginning)(region-end)
+ (split-string (read-string "Recipients: ") "[ \t,]+")))
+ (let* ((entity (pgg-make-scheme pgg-default-scheme))
+ (status
+ (pgg-save-coding-system start end
+ (pgg-scheme-encrypt-region entity (point-min)(point-max) rcpts))))
+ (when (interactive-p)
+ (pgg-display-output-buffer start end status))
+ status))
+
+;;;###autoload
+(defun pgg-decrypt-region (start end)
+ "Decrypt the current region between START and END."
+ (interactive "r")
+ (let* ((packet (cdr (assq 1 (pgg-parse-armor-region start end))))
+ (scheme
+ (or pgg-scheme
+ (cdr (assq 'scheme
+ (progn
+ (in-calist-package 'pgg)
+ (ctree-match-calist pgg-decrypt-condition
+ packet))))
+ pgg-default-scheme))
+ (entity (pgg-make-scheme scheme))
+ (status
+ (pgg-save-coding-system start end
+ (pgg-scheme-decrypt-region entity (point-min)(point-max)))))
+ (when (interactive-p)
+ (pgg-display-output-buffer start end status))
+ status))
+
+;;;###autoload
+(defun pgg-sign-region (start end &optional cleartext)
+ "Make the signature from text between START and END.
+If the optional 3rd argument CLEARTEXT is non-nil, it does not create
+a detached signature."
+ (interactive "r")
+ (let* ((entity (pgg-make-scheme pgg-default-scheme))
+ (status (pgg-save-coding-system start end
+ (pgg-scheme-sign-region entity (point-min)(point-max)
+ (or (interactive-p) cleartext)))))
+ (when (interactive-p)
+ (pgg-display-output-buffer start end status))
+ status))
+
+;;;###autoload
+(defun pgg-verify-region (start end &optional signature fetch)
+ "Verify the current region between START and END.
+If the optional 3rd argument SIGNATURE is non-nil, it is treated as
+the detached signature of the current region.
+
+If the optional 4th argument FETCH is non-nil, we attempt to fetch the
+signer's public key from `pgg-default-keyserver-address'."
+ (interactive "r")
+ (let* ((packet
+ (if (null signature) nil
+ (with-temp-buffer
+ (buffer-disable-undo)
+ (set-buffer-multibyte nil)
+ (insert-file-contents signature)
+ (cdr (assq 2 (pgg-decode-armor-region
+ (point-min)(point-max)))))))
+ (scheme
+ (or pgg-scheme
+ (cdr (assq 'scheme
+ (progn
+ (in-calist-package 'pgg)
+ (ctree-match-calist pgg-verify-condition
+ packet))))
+ pgg-default-scheme))
+ (entity (pgg-make-scheme scheme))
+ (key (cdr (assq 'key-identifier packet)))
+ status keyserver)
+ (and (stringp key)
+ (setq key (concat "0x" (pgg-truncate-key-identifier key)))
+ (null (let ((pgg-scheme scheme))
+ (pgg-lookup-key key)))
+ (or fetch (interactive-p))
+ (y-or-n-p (format "Key %s not found; attempt to fetch? " key))
+ (setq keyserver
+ (or (cdr (assq 'preferred-key-server packet))
+ pgg-default-keyserver-address))
+ (pgg-fetch-key keyserver key))
+ (setq status (pgg-save-coding-system start end
+ (pgg-scheme-verify-region entity (point-min)(point-max)
+ signature)))
+ (when (interactive-p)
+ (let ((temp-buffer-show-function
+ (function pgg-temp-buffer-show-function)))
+ (with-output-to-temp-buffer pgg-echo-buffer
+ (set-buffer standard-output)
+ (insert-buffer-substring (if status pgg-output-buffer
+ pgg-errors-buffer)))))
+ status))
+
+;;;###autoload
+(defun pgg-insert-key ()
+ "Insert the ASCII armored public key."
+ (interactive)
+ (let ((entity (pgg-make-scheme (or pgg-scheme pgg-default-scheme))))
+ (pgg-scheme-insert-key entity)))
+
+;;;###autoload
+(defun pgg-snarf-keys-region (start end)
+ "Import public keys in the current region between START and END."
+ (interactive "r")
+ (let ((entity (pgg-make-scheme (or pgg-scheme pgg-default-scheme))))
+ (pgg-save-coding-system start end
+ (pgg-scheme-snarf-keys-region entity start end))))
+
+(defun pgg-lookup-key (string &optional type)
+ (let ((entity (pgg-make-scheme (or pgg-scheme pgg-default-scheme))))
+ (pgg-scheme-lookup-key entity string type)))
+
+(defvar pgg-insert-url-function (function pgg-insert-url-with-w3))
+
+(defun pgg-insert-url-with-w3 (url)
+ (require 'w3)
+ (require 'url)
+ (let (buffer-file-name)
+ (url-insert-file-contents url)))
+
+(defvar pgg-insert-url-extra-arguments nil)
+(defvar pgg-insert-url-program nil)
+
+(defun pgg-insert-url-with-program (url)
+ (let ((args (copy-sequence pgg-insert-url-extra-arguments))
+ process)
+ (insert
+ (with-temp-buffer
+ (setq process
+ (apply #'start-process " *PGG url*" (current-buffer)
+ pgg-insert-url-program (nconc args (list url))))
+ (set-process-sentinel process #'ignore)
+ (while (eq 'run (process-status process))
+ (accept-process-output process 5))
+ (delete-process process)
+ (if (and process (eq 'run (process-status process)))
+ (interrupt-process process))
+ (buffer-string)))))
+
+(defun pgg-fetch-key (keyserver key)
+ "Attempt to fetch a KEY from KEYSERVER for addition to PGP or GnuPG keyring."
+ (with-current-buffer (get-buffer-create pgg-output-buffer)
+ (buffer-disable-undo)
+ (erase-buffer)
+ (let ((proto (if (string-match "^[a-zA-Z\\+\\.\\\\-]+:" keyserver)
+ (substring keyserver 0 (1- (match-end 0))))))
+ (save-excursion
+ (funcall pgg-insert-url-function
+ (if proto keyserver
+ (format "http://%s:11371/pks/lookup?op=get&search=%s"
+ keyserver key))))
+ (when (re-search-forward "^-+BEGIN" nil 'last)
+ (delete-region (point-min) (match-beginning 0))
+ (when (re-search-forward "^-+END" nil t)
+ (delete-region (progn (end-of-line) (point))
+ (point-max)))
+ (insert "\n")
+ (with-temp-buffer
+ (insert-buffer-substring pgg-output-buffer)
+ (pgg-snarf-keys-region (point-min)(point-max)))))))
+
+
+(provide 'pgg)
+
+;;; pgg.el ends here
projects / elisp / semi.git / blobdiff