;;; mml2015.el --- MIME Security with Pretty Good Privacy (PGP)
-;; Copyright (C) 2000-2013 Free Software Foundation, Inc.
+;; Copyright (C) 2000-2016 Free Software Foundation, Inc.
;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
;; Keywords: PGP MIME MML
;;; Code:
(eval-and-compile
- ;; For Emacs <22.2 and XEmacs.
- (unless (fboundp 'declare-function) (defmacro declare-function (&rest r)))
-
(if (locate-library "password-cache")
(require 'password-cache)
(require 'password)))
(config &optional minimum-version))
(declare-function epg-configuration "ext:epg-config" ())
+;; Maybe this should be in eg mml-sec.el (and have a different name).
+;; Then mml1991 would not need to require mml2015, and mml1991-use
+;; could be removed.
(defvar mml2015-use (or
- (condition-case nil
- (progn
- (require 'epg-config)
- (epg-check-configuration (epg-configuration))
- 'epg)
- (error))
+ (progn
+ (ignore-errors (require 'epg-config))
+ (and (fboundp 'epg-check-configuration)
+ 'epg))
(progn
(let ((abs-file (locate-library "pgg")))
;; Don't load PGG if it is marked as obsolete
"If t, cache passphrase."
:group 'mime-security
:type 'boolean)
+(make-obsolete-variable 'mml2015-cache-passphrase
+ 'mml-secure-cache-passphrase
+ "25.1")
(defcustom mml2015-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
"How many seconds the passphrase is cached.
`mml2015-cache-passphrase'."
:group 'mime-security
:type 'integer)
+(make-obsolete-variable 'mml2015-passphrase-cache-expiry
+ 'mml-secure-passphrase-cache-expiry
+ "25.1")
(defcustom mml2015-signers nil
"A list of your own key ID(s) which will be used to sign a message.
:group 'mime-security
:type 'boolean)
+(defcustom mml2015-maximum-key-image-dimension 64
+ "The maximum dimension (width or height) of any key images."
+ :version "24.4"
+ :group 'mime-security
+ :type 'integer)
+
+(defcustom mml2015-display-key-image t
+ "If t, try to display key images."
+ :version "24.5"
+ :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, and PGG) discard the output from GnuPG.
(autoload 'epg-sub-key-fingerprint "epg")
(autoload 'epg-signature-key-id "epg")
(autoload 'epg-signature-to-string "epg")
+(autoload 'epg-key-user-id-list "epg")
+(autoload 'epg-user-id-string "epg")
+(autoload 'epg-user-id-validity "epg")
(autoload 'epg-configuration "epg-config")
(autoload 'epg-expand-group "epg-config")
(autoload 'epa-select-keys "epa")
-(defvar mml2015-epg-secret-key-id-list nil)
-
-(defun mml2015-epg-passphrase-callback (context key-id ignore)
- (if (eq key-id 'SYM)
- (epg-passphrase-callback-function context key-id nil)
- (let* ((password-cache-key-id
- (if (eq key-id 'PIN)
- "PIN"
- key-id))
- entry
- (passphrase
- (password-read
- (if (eq key-id 'PIN)
- "Passphrase for PIN: "
- (if (setq entry (assoc key-id epg-user-id-alist))
- (format "Passphrase for %s %s: " key-id (cdr entry))
- (format "Passphrase for %s: " key-id)))
- password-cache-key-id)))
- (when passphrase
- (let ((password-cache-expiry mml2015-passphrase-cache-expiry))
- (password-cache-add password-cache-key-id passphrase))
- (setq mml2015-epg-secret-key-id-list
- (cons password-cache-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))))
- ;; The primary key will be marked as disabled, when the entire
- ;; key is disabled (see 12 Field, Format of colon listings, in
- ;; gnupg/doc/DETAILS)
- (unless (memq 'disabled (epg-sub-key-capability (car pointer)))
- (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)))))
-
-;; XXX: since gpg --list-secret-keys does not return validity of each
-;; key, `mml2015-epg-find-usable-key' defined above is not enough for
-;; secret keys. The function `mml2015-epg-find-usable-secret-key'
-;; below looks at appropriate public keys to check usability.
-(defun mml2015-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 (mml2015-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 'gnus-create-image "gnus-ems")
(defun mml2015-epg-key-image (key-id)
"Return the image of a key, if any"
(coding-system-for-read 'binary)
(data (shell-command-to-string
(format "%s --list-options no-show-photos --attribute-fd 3 --list-keys %s 3>&1 >/dev/null 2>&1"
- epg-gpg-program key-id))))
+ (shell-quote-argument epg-gpg-program) key-id))))
(when (> (length data) 0)
(insert (substring data 16))
- (create-image (buffer-string) nil t)))))
+ (condition-case nil
+ (gnus-create-image (buffer-string) nil t)
+ (error))))))
+
+(autoload 'gnus-rescale-image "gnus-util")
(defun mml2015-epg-key-image-to-string (key-id)
"Return a string with the image of a key, if any"
- (let* ((result "")
- (key-image (mml2015-epg-key-image key-id)))
- (when key-image
- (setq result " ")
- (put-text-property 1 2 'display key-image result))
- result))
+ (let ((key-image (mml2015-epg-key-image key-id)))
+ (if (not key-image)
+ ""
+ (condition-case error
+ (let ((result " "))
+ (put-text-property
+ 1 2 'display
+ (gnus-rescale-image key-image
+ (cons mml2015-maximum-key-image-dimension
+ mml2015-maximum-key-image-dimension))
+ result)
+ result)
+ (error "")))))
(defun mml2015-epg-signature-to-string (signature)
(concat (epg-signature-to-string signature)
- (mml2015-epg-key-image-to-string (epg-signature-key-id signature))))
+ (when mml2015-display-key-image
+ (mml2015-epg-key-image-to-string (epg-signature-key-id signature)))))
(defun mml2015-epg-verify-result-to-string (verify-result)
(mapconcat #'mml2015-epg-signature-to-string verify-result "\n"))
mm-security-handle 'gnus-info "Corrupted")
(throw 'error handle))
(setq context (epg-make-context))
- (if mml2015-cache-passphrase
+ (if (or mml2015-cache-passphrase mml-secure-cache-passphrase)
(epg-context-set-passphrase-callback
context
- #'mml2015-epg-passphrase-callback))
+ (cons 'mml-secure-passphrase-callback 'OpenPGP)))
(condition-case error
(setq plain (epg-decrypt-string context (mm-get-part child))
- mml2015-epg-secret-key-id-list nil)
+ mml-secure-secret-key-id-list nil)
(error
- (while mml2015-epg-secret-key-id-list
- (password-cache-remove (car mml2015-epg-secret-key-id-list))
- (setq mml2015-epg-secret-key-id-list
- (cdr mml2015-epg-secret-key-id-list)))
+ (mml-secure-clear-secret-key-id-list)
(mm-set-handle-multipart-parameter
mm-security-handle 'gnus-info "Failed")
(if (eq (car error) 'quit)
(let ((inhibit-redisplay t)
(context (epg-make-context))
plain)
- (if mml2015-cache-passphrase
+ (if (or mml2015-cache-passphrase mml-secure-cache-passphrase)
(epg-context-set-passphrase-callback
context
- #'mml2015-epg-passphrase-callback))
+ (cons 'mml-secure-passphrase-callback 'OpenPGP)))
(condition-case error
(setq plain (epg-decrypt-string context (buffer-string))
- mml2015-epg-secret-key-id-list nil)
+ mml-secure-secret-key-id-list nil)
(error
- (while mml2015-epg-secret-key-id-list
- (password-cache-remove (car mml2015-epg-secret-key-id-list))
- (setq mml2015-epg-secret-key-id-list
- (cdr mml2015-epg-secret-key-id-list)))
+ (mml-secure-clear-secret-key-id-list)
(mm-set-handle-multipart-parameter
mm-security-handle 'gnus-info "Failed")
(if (eq (car error) 'quit)
(mml2015-extract-cleartext-signature))))
(defun mml2015-epg-sign (cont)
- (let* ((inhibit-redisplay t)
- (context (epg-make-context))
- (boundary (mml-compute-boundary cont))
- (sender (message-options-get 'message-sender))
- (signer-names (or mml2015-signers
- (if (and mml2015-sign-with-sender sender)
- (list (concat "<" sender ">")))))
- signer-key
- (signers
- (or (message-options-get 'mml2015-epg-signers)
- (message-options-set
- 'mml2015-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. "
- signer-names
- t)
- (if (or sender mml2015-signers)
- (delq nil
- (mapcar
- (lambda (signer)
- (setq signer-key
- (mml2015-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)
- signer-names)))))))
- signature micalg)
- (epg-context-set-armor context t)
- (epg-context-set-textmode context t)
- (epg-context-set-signers context signers)
- (if mml2015-cache-passphrase
- (epg-context-set-passphrase-callback
- context
- #'mml2015-epg-passphrase-callback))
- (condition-case error
- (setq signature (epg-sign-string context (buffer-string) t)
- mml2015-epg-secret-key-id-list nil)
- (error
- (while mml2015-epg-secret-key-id-list
- (password-cache-remove (car mml2015-epg-secret-key-id-list))
- (setq mml2015-epg-secret-key-id-list
- (cdr mml2015-epg-secret-key-id-list)))
- (signal (car error) (cdr error))))
- (if (epg-context-result-for context 'sign)
- (setq micalg (epg-new-signature-digest-algorithm
- (car (epg-context-result-for context 'sign)))))
- (goto-char (point-min))
- (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
- boundary))
- (if micalg
- (insert (format "\tmicalg=pgp-%s; "
- (downcase
- (cdr (assq micalg
- epg-digest-algorithm-alist))))))
- (insert "protocol=\"application/pgp-signature\"\n")
- (insert (format "\n--%s\n" boundary))
- (goto-char (point-max))
- (insert (format "\n--%s\n" boundary))
- (insert "Content-Type: application/pgp-signature\n\n")
- (insert signature)
+ (let ((inhibit-redisplay t)
+ (boundary (mml-compute-boundary cont)))
+ ;; Signed data must end with a newline (RFC 3156, 5).
(goto-char (point-max))
- (insert (format "--%s--\n" boundary))
- (goto-char (point-max))))
+ (unless (bolp)
+ (insert "\n"))
+ (let* ((pair (mml-secure-epg-sign 'OpenPGP t))
+ (signature (car pair))
+ (micalg (cdr pair)))
+ (goto-char (point-min))
+ (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
+ boundary))
+ (if micalg
+ (insert (format "\tmicalg=pgp-%s; "
+ (downcase
+ (cdr (assq micalg
+ epg-digest-algorithm-alist))))))
+ (insert "protocol=\"application/pgp-signature\"\n")
+ (insert (format "\n--%s\n" boundary))
+ (goto-char (point-max))
+ (insert (format "\n--%s\n" boundary))
+ (insert "Content-Type: application/pgp-signature; name=\"signature.asc\"\n\n")
+ (insert signature)
+ (goto-char (point-max))
+ (insert (format "--%s--\n" boundary))
+ (goto-char (point-max)))))
(defun mml2015-epg-encrypt (cont &optional sign)
(let* ((inhibit-redisplay t)
- (context (epg-make-context))
(boundary (mml-compute-boundary cont))
- (config (epg-configuration))
- (recipients (message-options-get 'mml2015-epg-recipients))
- cipher
- (sender (message-options-get 'message-sender))
- (signer-names (or mml2015-signers
- (if (and mml2015-sign-with-sender sender)
- (list (concat "<" sender ">")))))
- signers
- recipient-key signer-key)
- (unless recipients
- (setq recipients
- (apply #'nconc
- (mapcar
- (lambda (recipient)
- (or (epg-expand-group config 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 signer-names
- (error "Neither message sender nor mml2015-signers are set"))
- (setq recipients (nconc recipients signer-names)))
- (if (eq mm-encrypt-option 'guided)
- (setq recipients
- (epa-select-keys context "\
-Select recipients for encryption.
-If no one is selected, symmetric encryption will be performed. "
- recipients))
- (setq recipients
- (delq nil
- (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
- (or (message-options-get 'mml2015-epg-signers)
- (message-options-set
- 'mml2015-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. "
- signer-names
- t)
- (if (or sender mml2015-signers)
- (delq nil
- (mapcar
- (lambda (signer)
- (setq signer-key
- (mml2015-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)
- signer-names)))))))
- (epg-context-set-signers context signers))
- (epg-context-set-armor context t)
- (epg-context-set-textmode context t)
- (if mml2015-cache-passphrase
- (epg-context-set-passphrase-callback
- context
- #'mml2015-epg-passphrase-callback))
- (condition-case error
- (setq cipher
- (epg-encrypt-string context (buffer-string) recipients sign
- mml2015-always-trust)
- mml2015-epg-secret-key-id-list nil)
- (error
- (while mml2015-epg-secret-key-id-list
- (password-cache-remove (car mml2015-epg-secret-key-id-list))
- (setq mml2015-epg-secret-key-id-list
- (cdr mml2015-epg-secret-key-id-list)))
- (signal (car error) (cdr error))))
+ (cipher (mml-secure-epg-encrypt 'OpenPGP cont sign)))
(delete-region (point-min) (point-max))
(goto-char (point-min))
(insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
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