;;; mml2015.el --- MIME Security with Pretty Good Privacy (PGP)
;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
-;; 2005, 2006 Free Software Foundation, Inc.
+;; 2005, 2006, 2007 Free Software Foundation, Inc.
;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
;; Keywords: PGP MIME MML
;; 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
+;; by the Free Software Foundation; either version 3, or (at your
;; option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful, but
;;; Code:
+;; For Emacs < 22.2.
+(eval-and-compile
+ (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
+
(eval-when-compile (require 'cl))
(require 'mm-decode)
(require 'mm-util)
(defvar mc-pgp-always-sign)
+(declare-function epg-check-configuration "ext:epg-config"
+ (config &optional minimum-version))
+(declare-function epg-configuration "ext:epg-config" ())
+
(defvar mml2015-use (or
(condition-case nil
(progn
:group 'mime-security
:type 'boolean)
+;; Extract plaintext from cleartext signature. IMO, this kind of task
+;; should be done by GnuPG rather than Elisp, but older PGP backends
+;; (such as Mailcrypt, PGG, and gpg.el) discard the output from GnuPG.
+(defun mml2015-extract-cleartext-signature ()
+ (goto-char (point-min))
+ (forward-line)
+ ;; We need to be careful not to strip beyond the armor headers.
+ ;; Previously, an attacker could replace the text inside our
+ ;; markup with trailing garbage by injecting whitespace into the
+ ;; message.
+ (while (looking-at "Hash:") ; The only header allowed in cleartext
+ (forward-line)) ; signatures according to RFC2440.
+ (when (looking-at "[\t ]*$")
+ (forward-line))
+ (delete-region (point-min) (point))
+ (if (re-search-forward "^-----BEGIN PGP SIGNATURE-----" nil t)
+ (delete-region (match-beginning 0) (point-max)))
+ (goto-char (point-min))
+ (while (re-search-forward "^- " nil t)
+ (replace-match "" t t)
+ (forward-line 1)))
+
;;; mailcrypt wrapper
(eval-and-compile
(autoload 'mc-cleanup-recipient-headers "mc-toplev")
(autoload 'mc-sign-generic "mc-toplev"))
-(eval-when-compile
- (defvar mc-default-scheme)
- (defvar mc-schemes))
+(defvar mc-default-scheme)
+(defvar mc-schemes)
(defvar mml2015-decrypt-function 'mailcrypt-decrypt)
(defvar mml2015-verify-function 'mailcrypt-verify)
(mm-set-handle-multipart-parameter
mm-security-handle 'gnus-info "OK")
(mm-set-handle-multipart-parameter
- mm-security-handle 'gnus-info "Failed"))))
+ mm-security-handle 'gnus-info "Failed")))
+ (mml2015-extract-cleartext-signature))
(defun mml2015-mailcrypt-sign (cont)
(mc-sign-generic (message-options-get 'message-sender)
(insert (format "--%s--\n" boundary))
(goto-char (point-max))))
+;; We require mm-decode, which requires mm-bodies, which autoloads
+;; message-options-get (!).
+(declare-function message-options-set "message" (symbol value))
+
(defun mml2015-mailcrypt-encrypt (cont &optional sign)
(let ((mc-pgp-always-sign
(or mc-pgp-always-sign
(with-temp-buffer
(setq message (current-buffer))
(insert part)
- ;; Convert <LF> to <CR><LF> in verify mode. Sign and
- ;; clearsign use --textmode. The conversion is not necessary.
- ;; In clearverify, the conversion is not necessary either.
+ ;; Convert <LF> to <CR><LF> in signed text. If --textmode is
+ ;; specified when signing, the conversion is not necessary.
(goto-char (point-min))
(end-of-line)
(while (not (eobp))
(with-current-buffer mml2015-result-buffer
(mml2015-gpg-extract-signature-details)))
(mm-set-handle-multipart-parameter
- mm-security-handle 'gnus-info "Failed")))
+ mm-security-handle 'gnus-info "Failed"))
+ (mml2015-extract-cleartext-signature))
(defun mml2015-gpg-sign (cont)
(let ((boundary (mml-compute-boundary cont))
;;; pgg wrapper
-(eval-when-compile
- (defvar pgg-default-user-id)
- (defvar pgg-errors-buffer)
- (defvar pgg-output-buffer))
+(defvar pgg-default-user-id)
+(defvar pgg-errors-buffer)
+(defvar pgg-output-buffer)
(eval-and-compile
(autoload 'pgg-decrypt-region "pgg")
handle)
(with-temp-buffer
(insert part)
- ;; Convert <LF> to <CR><LF> in verify mode. Sign and
- ;; clearsign use --textmode. The conversion is not necessary.
- ;; In clearverify, the conversion is not necessary either.
+ ;; Convert <LF> to <CR><LF> in signed text. If --textmode is
+ ;; specified when signing, the conversion is not necessary.
(goto-char (point-min))
(end-of-line)
(while (not (eobp))
(if (condition-case err
(prog1
(mm-with-unibyte-buffer
- (insert (encode-coding-string text coding-system))
+ (insert (mm-encode-coding-string text coding-system))
(pgg-verify-region (point-min) (point-max) nil t))
(goto-char (point-min))
(while (search-forward "\r\n" nil t)
(with-current-buffer pgg-errors-buffer
(mml2015-gpg-extract-signature-details)))
(mm-set-handle-multipart-parameter
- mm-security-handle 'gnus-info "Failed"))))
+ mm-security-handle 'gnus-info "Failed")))
+ (mml2015-extract-cleartext-signature))
(defun mml2015-pgg-sign (cont)
(let ((pgg-errors-buffer mml2015-result-buffer)
;;; epg wrapper
-(eval-and-compile
- (autoload 'epg-make-context "epg"))
+(defvar epg-user-id-alist)
+(defvar epg-digest-algorithm-alist)
+(defvar inhibit-redisplay)
-(eval-when-compile
- (defvar epg-user-id-alist)
- (defvar epg-digest-algorithm-alist)
- (defvar inhibit-redisplay)
+(eval-and-compile
+ (autoload 'epg-make-context "epg")
(autoload 'epg-context-set-armor "epg")
(autoload 'epg-context-set-textmode "epg")
(autoload 'epg-context-set-signers "epg")
(autoload 'epg-encrypt-string "epg")
(autoload 'epg-passphrase-callback-function "epg")
(autoload 'epg-context-set-passphrase-callback "epg")
+ (autoload 'epg-key-sub-key-list "epg")
+ (autoload 'epg-sub-key-capability "epg")
+ (autoload 'epg-sub-key-validity "epg")
(autoload 'epg-configuration "epg-config")
(autoload 'epg-expand-group "epg-config")
(autoload 'epa-select-keys "epa"))
-(eval-when-compile
- (defvar password-cache-expiry)
- (autoload 'password-read "password")
- (autoload 'password-cache-add "password")
- (autoload 'password-cache-remove "password"))
+(defvar password-cache-expiry)
(defvar mml2015-epg-secret-key-id-list nil)
(cons key-id mml2015-epg-secret-key-id-list))
(copy-sequence passphrase)))))
+(defun mml2015-epg-find-usable-key (keys usage)
+ (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)))))
+
(defun mml2015-epg-decrypt (handle ctl)
(catch 'error
(let ((inhibit-redisplay t)
(mm-set-handle-multipart-parameter
mm-security-handle 'gnus-info "Corrupted")
(throw 'error handle))
- (setq context (epg-make-context))
+ (setq part (mm-replace-in-string part "\n" "\r\n" t)
+ signature (mm-get-part signature)
+ context (epg-make-context))
(condition-case error
- (setq plain (epg-verify-string context (mm-get-part signature) part))
+ (setq plain (epg-verify-string context signature part))
(error
(mm-set-handle-multipart-parameter
mm-security-handle 'gnus-info "Failed")
(defun mml2015-epg-clear-verify ()
(let ((inhibit-redisplay t)
(context (epg-make-context))
- (signature (encode-coding-string (buffer-string)
- buffer-file-coding-system))
+ (signature (mm-encode-coding-string (buffer-string)
+ coding-system-for-write))
plain)
(condition-case error
(setq plain (epg-verify-string context signature))
(mm-set-handle-multipart-parameter
mm-security-handle 'gnus-details (mml2015-format-error error)))))
(if plain
- (mm-set-handle-multipart-parameter
- mm-security-handle 'gnus-info
- (epg-verify-result-to-string
- (epg-context-result-for context 'verify))))))
+ (progn
+ (mm-set-handle-multipart-parameter
+ mm-security-handle 'gnus-info
+ (epg-verify-result-to-string
+ (epg-context-result-for context 'verify)))
+ (delete-region (point-min) (point-max))
+ (insert (mm-decode-coding-string plain coding-system-for-read)))
+ (mml2015-extract-cleartext-signature))))
(defun mml2015-epg-sign (cont)
(let* ((inhibit-redisplay t)
- (context (epg-make-context))
- (boundary (mml-compute-boundary cont))
- (signers
- (or (message-options-get 'mml2015-epg-signers)
- (message-options-set
- 'mml2015-epg-signers
- (if mml2015-verbose
- (epa-select-keys context "\
+ (context (epg-make-context))
+ (boundary (mml-compute-boundary cont))
+ signer-key
+ (signers
+ (or (message-options-get 'mml2015-epg-signers)
+ (message-options-set
+ 'mml2015-epg-signers
+ (if mml2015-verbose
+ (epa-select-keys context "\
Select keys for signing.
If no one is selected, default secret key is used. "
- mml2015-signers t)
- (if mml2015-signers
- (mapcar (lambda (name)
- (car (epg-list-keys context name t)))
- mml2015-signers))))))
- signature micalg)
+ mml2015-signers t)
+ (if mml2015-signers
+ (mapcar
+ (lambda (signer)
+ (setq signer-key (mml2015-epg-find-usable-key
+ (epg-list-keys context signer t)
+ 'sign))
+ (unless (or signer-key
+ (y-or-n-p
+ (format "No secret key for %s; skip it? "
+ signer)))
+ (error "No secret key for %s" signer))
+ signer-key)
+ mml2015-signers))))))
+ signature micalg)
(epg-context-set-armor context t)
(epg-context-set-textmode context t)
(epg-context-set-signers context signers)
(insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
boundary))
(if micalg
- (insert (format "\tmicalg=%s; "
+ (insert (format "\tmicalg=pgp-%s; "
(downcase
(cdr (assq micalg
epg-digest-algorithm-alist))))))
(config (epg-configuration))
(recipients (message-options-get 'mml2015-epg-recipients))
cipher signers
- (boundary (mml-compute-boundary cont)))
+ (boundary (mml-compute-boundary cont))
+ recipient-key signer-key)
(unless recipients
(setq recipients
(apply #'nconc
(mapcar
(lambda (recipient)
(or (epg-expand-group config recipient)
- (list recipient)))
+ (list (concat "<" recipient ">"))))
(split-string
(or (message-options-get 'message-recipients)
(message-options-set 'message-recipients
(read-string "Recipients: ")))
"[ \f\t\n\r\v,]+"))))
+ (when mml2015-encrypt-to-self
+ (unless mml2015-signers
+ (error "mml2015-signers not set"))
+ (setq recipients (nconc recipients mml2015-signers)))
(if mml2015-verbose
(setq recipients
(epa-select-keys context "\
If no one is selected, symmetric encryption will be performed. "
recipients))
(setq recipients
- (delq nil (mapcar (lambda (name)
- (car (epg-list-keys context name)))
- recipients))))
- (if mml2015-encrypt-to-self
- (if mml2015-signers
- (setq recipients
- (nconc recipients
- (mapcar (lambda (name)
- (car (epg-list-keys context name)))
- mml2015-signers)))
- (error "mml2015-signers not set")))
+ (mapcar
+ (lambda (recipient)
+ (setq recipient-key (mml2015-epg-find-usable-key
+ (epg-list-keys context recipient)
+ 'encrypt))
+ (unless (or recipient-key
+ (y-or-n-p
+ (format "No public key for %s; skip it? "
+ recipient)))
+ (error "No public key for %s" recipient))
+ recipient-key)
+ recipients))
+ (unless recipients
+ (error "No recipient specified")))
(message-options-set 'mml2015-epg-recipients recipients))
(when sign
(setq signers
If no one is selected, default secret key is used. "
mml2015-signers t)
(if mml2015-signers
- (mapcar (lambda (name)
- (car (epg-list-keys context name t)))
- mml2015-signers))))))
+ (mapcar
+ (lambda (signer)
+ (setq signer-key (mml2015-epg-find-usable-key
+ (epg-list-keys context signer t)
+ 'sign))
+ (unless (or signer-key
+ (y-or-n-p
+ (format
+ "No secret key for %s; skip it? "
+ signer)))
+ (error "No secret key for %s" signer))
+ signer-key)
+ mml2015-signers))))))
(epg-context-set-signers context signers))
(epg-context-set-armor context t)
(epg-context-set-textmode context t)
;;; General wrapper
+(autoload 'gnus-buffer-live-p "gnus-util")
+(autoload 'gnus-get-buffer-create "gnus")
+
(defun mml2015-clean-buffer ()
(if (gnus-buffer-live-p mml2015-result-buffer)
(with-current-buffer mml2015-result-buffer
projects / gnus / blobdiff