;;; mml-smime.el --- S/MIME support for MML
-;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+;; Copyright (C) 2000-2015 Free Software Foundation, Inc.
;; Author: Simon Josefsson <simon@josefsson.org>
;; Keywords: Gnus, MIME, S/MIME, MML
;;; Code:
-;; For Emacs < 22.2.
-(eval-and-compile
- (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
-
(eval-when-compile (require 'cl))
(require 'smime)
(autoload 'message-narrow-to-headers "message")
(autoload 'message-fetch-field "message")
-(defvar mml-smime-use 'openssl)
+(defcustom mml-smime-use (if (featurep 'epg) 'epg 'openssl)
+ "Whether to use OpenSSL or EPG to decrypt S/MIME messages.
+Defaults to EPG if it's loaded."
+ :group 'mime-security
+ :type '(choice (const :tag "EPG" epg)
+ (const :tag "OpenSSL" openssl)))
(defvar mml-smime-function-alist
'((openssl mml-smime-openssl-sign
:group 'mime-security
:type '(repeat (string :tag "Key ID")))
+(defcustom mml-smime-sign-with-sender nil
+ "If t, use message sender so find a key to sign with."
+ :group 'mime-security
+ :version "24.4"
+ :type 'boolean)
+
+(defcustom mml-smime-encrypt-to-self nil
+ "If t, add your own key ID to recipient list when encryption."
+ :group 'mime-security
+ :version "24.4"
+ :type 'boolean)
+
(defun mml-smime-sign (cont)
(let ((func (nth 1 (assq mml-smime-use mml-smime-function-alist))))
(if func
(and from (smime-get-key-by-email from)))
(smime-get-key-by-email
(gnus-completing-read "Sign this part with what signature"
- smime-keys nil nil
+ (mapcar 'car smime-keys) nil nil nil
(and (listp (car-safe smime-keys))
(caar smime-keys))))))))
(while (not done)
(ecase (read (gnus-completing-read
"Fetch certificate from"
- '(("dns") ("ldap") ("file")) t nil nil
+ '("dns" "ldap" "file") t nil nil
"ldap"))
(dns (setq certs (append certs
(mml-smime-get-dns-cert))))
(defvar inhibit-redisplay)
(defvar password-cache-expiry)
-(eval-when-compile
- (autoload 'epg-make-context "epg")
- (autoload 'epg-context-set-armor "epg")
- (autoload 'epg-context-set-signers "epg")
- (autoload 'epg-context-result-for "epg")
- (autoload 'epg-new-signature-digest-algorithm "epg")
- (autoload 'epg-verify-result-to-string "epg")
- (autoload 'epg-list-keys "epg")
- (autoload 'epg-decrypt-string "epg")
- (autoload 'epg-verify-string "epg")
- (autoload 'epg-sign-string "epg")
- (autoload 'epg-encrypt-string "epg")
- (autoload 'epg-passphrase-callback-function "epg")
- (autoload 'epg-context-set-passphrase-callback "epg")
- (autoload 'epg-configuration "epg-config")
- (autoload 'epg-expand-group "epg-config")
- (autoload 'epa-select-keys "epa"))
+(autoload 'epg-make-context "epg")
+(autoload 'epg-passphrase-callback-function "epg")
+(declare-function epg-context-set-signers "epg" (context signers))
+(declare-function epg-context-result-for "epg" (context name))
+(declare-function epg-new-signature-digest-algorithm "epg" (cl-x) t)
+(declare-function epg-verify-result-to-string "epg" (verify-result))
+(declare-function epg-list-keys "epg" (context &optional name mode))
+(declare-function epg-verify-string "epg"
+ (context signature &optional signed-text))
+(declare-function epg-sign-string "epg" (context plain &optional mode))
+(declare-function epg-encrypt-string "epg"
+ (context plain recipients &optional sign always-trust))
+(declare-function epg-context-set-passphrase-callback "epg"
+ (context passphrase-callback))
+(declare-function epg-sub-key-fingerprint "epg" (cl-x) t)
+(declare-function epg-configuration "epg-config" ())
+(declare-function epg-expand-group "epg-config" (config group))
+(declare-function epa-select-keys "epa"
+ (context prompt &optional names secret))
(defvar mml-smime-epg-secret-key-id-list nil)
(cons key-id mml-smime-epg-secret-key-id-list))
(copy-sequence passphrase)))))
-(declare-function epg-key-sub-key-list "ext:epg" (key))
-(declare-function epg-sub-key-capability "ext:epg" (sub-key))
-(declare-function epg-sub-key-validity "ext:epg" (sub-key))
+(declare-function epg-key-sub-key-list "epg" (key) t)
+(declare-function epg-sub-key-capability "epg" (sub-key) t)
+(declare-function epg-sub-key-validity "epg" (sub-key) t)
(defun mml-smime-epg-find-usable-key (keys usage)
(catch 'found
(setq pointer (cdr pointer))))
(setq keys (cdr keys)))))
+;; XXX: since gpg --list-secret-keys does not return validity of each
+;; key, `mml-smime-epg-find-usable-key' defined above is not enough for
+;; secret keys. The function `mml-smime-epg-find-usable-secret-key'
+;; below looks at appropriate public keys to check usability.
+(defun mml-smime-epg-find-usable-secret-key (context name usage)
+ (let ((secret-keys (epg-list-keys context name t))
+ secret-key)
+ (while (and (not secret-key) secret-keys)
+ (if (mml-smime-epg-find-usable-key
+ (epg-list-keys context (epg-sub-key-fingerprint
+ (car (epg-key-sub-key-list
+ (car secret-keys)))))
+ usage)
+ (setq secret-key (car secret-keys)
+ secret-keys nil)
+ (setq secret-keys (cdr secret-keys))))
+ secret-key))
+
(autoload 'mml-compute-boundary "mml")
;; We require mm-decode, which requires mm-bodies, which autoloads
(let* ((inhibit-redisplay t)
(context (epg-make-context 'CMS))
(boundary (mml-compute-boundary cont))
+ (sender (message-options-get 'message-sender))
+ (signer-names (or mml-smime-signers
+ (if (and mml-smime-sign-with-sender sender)
+ (list (concat "<" sender ">")))))
signer-key
(signers
(or (message-options-get 'mml-smime-epg-signers)
(message-options-set
- 'mml-smime-epg-signers
- (if (eq mm-sign-option 'guided)
- (epa-select-keys context "\
+ 'mml-smime-epg-signers
+ (if (eq mm-sign-option 'guided)
+ (epa-select-keys context "\
Select keys for signing.
If no one is selected, default secret key is used. "
- mml-smime-signers t)
- (if mml-smime-signers
- (mapcar
- (lambda (signer)
- (setq signer-key (mml-smime-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-names
+ t)
+ (if (or sender mml-smime-signers)
+ (delq nil
+ (mapcar
+ (lambda (signer)
+ (setq signer-key
+ (mml-smime-epg-find-usable-secret-key
+ context signer '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)
- mml-smime-signers))))))
+ (error "No secret key for %s" signer))
+ signer-key)
+ signer-names)))))))
signature micalg)
(epg-context-set-signers context signers)
(if mml-smime-cache-passphrase
(goto-char (point-max))))
(defun mml-smime-epg-encrypt (cont)
- (let ((inhibit-redisplay t)
- (context (epg-make-context 'CMS))
- (config (epg-configuration))
- (recipients (message-options-get 'mml-smime-epg-recipients))
- cipher signers
- (boundary (mml-compute-boundary cont))
- recipient-key)
+ (let* ((inhibit-redisplay t)
+ (context (epg-make-context 'CMS))
+ (config (epg-configuration))
+ (recipients (message-options-get 'mml-smime-epg-recipients))
+ cipher signers
+ (sender (message-options-get 'message-sender))
+ (signer-names (or mml-smime-signers
+ (if (and mml-smime-sign-with-sender sender)
+ (list (concat "<" sender ">")))))
+ (boundary (mml-compute-boundary cont))
+ recipient-key)
(unless recipients
(setq recipients
(apply #'nconc
(message-options-set 'message-recipients
(read-string "Recipients: ")))
"[ \f\t\n\r\v,]+"))))
+ (when mml-smime-encrypt-to-self
+ (unless signer-names
+ (error "Neither message sender nor mml-smime-signers are set"))
+ (setq recipients (nconc recipients signer-names)))
(if (eq mm-encrypt-option 'guided)
(setq recipients
(epa-select-keys context "\
(mm-set-handle-multipart-parameter
mm-security-handle 'gnus-info "Corrupted")
(throw 'error handle))
- (setq part (mm-replace-in-string part "\n" "\r\n" t)
+ (setq part (mm-replace-in-string part "\n" "\r\n")
context (epg-make-context 'CMS))
(condition-case error
(setq plain (epg-verify-string context (mm-get-part signature) part))
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