code.delx.au - gnu-emacs/blob - lisp/gnus/mml2015.el

   1 ;;; mml2015.el --- MIME Security with Pretty Good Privacy (PGP)
   2
   3 ;; Copyright (C) 2000-2016 Free Software Foundation, Inc.
   4
   5 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
   6 ;; Keywords: PGP MIME MML
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; RFC 2015 is updated by RFC 3156, this file should be compatible
  26 ;; with both.
  27
  28 ;;; Code:
  29
  30 (eval-when-compile (require 'cl))
  31 (require 'mm-decode)
  32 (require 'mm-util)
  33 (require 'mml)
  34 (require 'mml-sec)
  35
  36 (defvar mc-pgp-always-sign)
  37
  38 (declare-function epg-check-configuration "ext:epg-config"
  39                   (config &optional minimum-version))
  40 (declare-function epg-configuration "ext:epg-config" ())
  41
  42 ;; Maybe this should be in eg mml-sec.el (and have a different name).
  43 ;; Then mml1991 would not need to require mml2015, and mml1991-use
  44 ;; could be removed.
  45 (defvar mml2015-use (or
  46                      (progn
  47                        (ignore-errors (require 'epg-config))
  48                        (and (fboundp 'epg-check-configuration)
  49                            'epg))
  50                      (progn
  51                        (let ((abs-file (locate-library "pgg")))
  52                          ;; Don't load PGG if it is marked as obsolete
  53                          ;; (Emacs 24).
  54                          (when (and abs-file
  55                                     (not (string-match "/obsolete/[^/]*\\'"
  56                                                        abs-file)))
  57                            (ignore-errors (require 'pgg))
  58                            (and (fboundp 'pgg-sign-region)
  59                                 'pgg))))
  60                      (progn (ignore-errors
  61                               (load "mc-toplev"))
  62                             (and (fboundp 'mc-encrypt-generic)
  63                                  (fboundp 'mc-sign-generic)
  64                                  (fboundp 'mc-cleanup-recipient-headers)
  65                                  'mailcrypt)))
  66   "The package used for PGP/MIME.
  67 Valid packages include `epg', `pgg' and `mailcrypt'.")
  68
  69 ;; Something is not RFC2015.
  70 (defvar mml2015-function-alist
  71   '((mailcrypt mml2015-mailcrypt-sign
  72                mml2015-mailcrypt-encrypt
  73                mml2015-mailcrypt-verify
  74                mml2015-mailcrypt-decrypt
  75                mml2015-mailcrypt-clear-verify
  76                mml2015-mailcrypt-clear-decrypt)
  77     (pgg mml2015-pgg-sign
  78          mml2015-pgg-encrypt
  79          mml2015-pgg-verify
  80          mml2015-pgg-decrypt
  81          mml2015-pgg-clear-verify
  82          mml2015-pgg-clear-decrypt)
  83     (epg mml2015-epg-sign
  84          mml2015-epg-encrypt
  85          mml2015-epg-verify
  86          mml2015-epg-decrypt
  87          mml2015-epg-clear-verify
  88          mml2015-epg-clear-decrypt))
  89   "Alist of PGP/MIME functions.")
  90
  91 (defvar mml2015-result-buffer nil)
  92
  93 (defcustom mml2015-unabbrev-trust-alist
  94   '(("TRUST_UNDEFINED" . nil)
  95     ("TRUST_NEVER"     . nil)
  96     ("TRUST_MARGINAL"  . t)
  97     ("TRUST_FULLY"     . t)
  98     ("TRUST_ULTIMATE"  . t))
  99   "Map GnuPG trust output values to a boolean saying if you trust the key."
 100   :version "22.1"
 101   :group 'mime-security
 102   :type '(repeat (cons (regexp :tag "GnuPG output regexp")
 103                        (boolean :tag "Trust key"))))
 104
 105 (defcustom mml2015-cache-passphrase mml-secure-cache-passphrase
 106   "If t, cache passphrase."
 107   :group 'mime-security
 108   :type 'boolean)
 109 (make-obsolete-variable 'mml2015-cache-passphrase
 110                         'mml-secure-cache-passphrase
 111                         "25.1")
 112
 113 (defcustom mml2015-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
 114   "How many seconds the passphrase is cached.
 115 Whether the passphrase is cached at all is controlled by
 116 `mml2015-cache-passphrase'."
 117   :group 'mime-security
 118   :type 'integer)
 119 (make-obsolete-variable 'mml2015-passphrase-cache-expiry
 120                         'mml-secure-passphrase-cache-expiry
 121                         "25.1")
 122
 123 (defcustom mml2015-signers nil
 124   "A list of your own key ID(s) which will be used to sign a message.
 125 If set, it overrides the setting of `mml2015-sign-with-sender'."
 126   :group 'mime-security
 127   :type '(repeat (string :tag "Key ID")))
 128
 129 (defcustom mml2015-sign-with-sender nil
 130   "If t, use message sender so find a key to sign with."
 131   :group 'mime-security
 132   :type 'boolean
 133   :version "24.1")
 134
 135 (defcustom mml2015-encrypt-to-self nil
 136   "If t, add your own key ID to recipient list when encryption."
 137   :group 'mime-security
 138   :type 'boolean)
 139
 140 (defcustom mml2015-always-trust t
 141   "If t, GnuPG skip key validation on encryption."
 142   :group 'mime-security
 143   :type 'boolean)
 144
 145 (defcustom mml2015-maximum-key-image-dimension 64
 146   "The maximum dimension (width or height) of any key images."
 147   :version "24.4"
 148   :group 'mime-security
 149   :type 'integer)
 150
 151 (defcustom mml2015-display-key-image t
 152   "If t, try to display key images."
 153   :version "24.5"
 154   :group 'mime-security
 155   :type 'boolean)
 156
 157 ;; Extract plaintext from cleartext signature.  IMO, this kind of task
 158 ;; should be done by GnuPG rather than Elisp, but older PGP backends
 159 ;; (such as Mailcrypt, and PGG) discard the output from GnuPG.
 160 (defun mml2015-extract-cleartext-signature ()
 161   ;; Daiki Ueno in
 162   ;; <54a15d860801080142l70b95d7dkac4bf51a86196011@mail.gmail.com>: ``I still
 163   ;; believe that the right way is to use the plaintext output from GnuPG as
 164   ;; it is, and mml2015-extract-cleartext-signature is just a kludge for
 165   ;; misdesigned libraries like PGG, which have no ability to do that.  So, I
 166   ;; think it should not have descriptive documentation.''
 167   ;;
 168   ;; This function doesn't handle NotDashEscaped correctly.  EasyPG handles it
 169   ;; correctly.
 170   ;; http://thread.gmane.org/gmane.emacs.gnus.general/66062/focus=66082
 171   ;; http://thread.gmane.org/gmane.emacs.gnus.general/65087/focus=65109
 172   (goto-char (point-min))
 173   (forward-line)
 174   ;; We need to be careful not to strip beyond the armor headers.
 175   ;; Previously, an attacker could replace the text inside our
 176   ;; markup with trailing garbage by injecting whitespace into the
 177   ;; message.
 178   (while (looking-at "Hash:")           ; The only header allowed in cleartext
 179     (forward-line))                     ; signatures according to RFC2440.
 180   (when (looking-at "[\t ]*$")
 181     (forward-line))
 182   (delete-region (point-min) (point))
 183   (if (re-search-forward "^-----BEGIN PGP SIGNATURE-----" nil t)
 184       (delete-region (match-beginning 0) (point-max)))
 185   (goto-char (point-min))
 186   (while (re-search-forward "^- " nil t)
 187     (replace-match "" t t)
 188     (forward-line 1)))
 189
 190 ;;; mailcrypt wrapper
 191
 192 (autoload 'mailcrypt-decrypt "mailcrypt")
 193 (autoload 'mailcrypt-verify "mailcrypt")
 194 (autoload 'mc-pgp-always-sign "mailcrypt")
 195 (autoload 'mc-encrypt-generic "mc-toplev")
 196 (autoload 'mc-cleanup-recipient-headers "mc-toplev")
 197 (autoload 'mc-sign-generic "mc-toplev")
 198
 199 (defvar mml2015-decrypt-function 'mailcrypt-decrypt)
 200 (defvar mml2015-verify-function 'mailcrypt-verify)
 201
 202 (defun mml2015-format-error (err)
 203   (if (stringp (cadr err))
 204       (cadr err)
 205     (format "%S" (cdr err))))
 206
 207 (defun mml2015-mailcrypt-decrypt (handle ctl)
 208   (catch 'error
 209     (let (child handles result)
 210       (unless (setq child (mm-find-part-by-type
 211                            (cdr handle)
 212                            "application/octet-stream" nil t))
 213         (mm-set-handle-multipart-parameter
 214          mm-security-handle 'gnus-info "Corrupted")
 215         (throw 'error handle))
 216       (with-temp-buffer
 217         (mm-insert-part child)
 218         (setq result
 219               (condition-case err
 220                   (funcall mml2015-decrypt-function)
 221                 (error
 222                  (mm-set-handle-multipart-parameter
 223                   mm-security-handle 'gnus-details (mml2015-format-error err))
 224                  nil)
 225                 (quit
 226                  (mm-set-handle-multipart-parameter
 227                   mm-security-handle 'gnus-details "Quit.")
 228                  nil)))
 229         (unless (car result)
 230           (mm-set-handle-multipart-parameter
 231            mm-security-handle 'gnus-info "Failed")
 232           (throw 'error handle))
 233         (setq handles (mm-dissect-buffer t)))
 234       (mm-destroy-parts handle)
 235       (mm-set-handle-multipart-parameter
 236        mm-security-handle 'gnus-info
 237        (concat "OK"
 238                (let ((sig (with-current-buffer mml2015-result-buffer
 239                             (mml2015-gpg-extract-signature-details))))
 240                  (concat ", Signer: " sig))))
 241       (if (listp (car handles))
 242           handles
 243         (list handles)))))
 244
 245 (defun mml2015-gpg-pretty-print-fpr (fingerprint)
 246   (let* ((result "")
 247          (fpr-length (string-width fingerprint))
 248          (n-slice 0)
 249          slice)
 250     (setq fingerprint (string-to-list fingerprint))
 251     (while fingerprint
 252       (setq fpr-length (- fpr-length 4))
 253       (setq slice (butlast fingerprint fpr-length))
 254       (setq fingerprint (nthcdr 4 fingerprint))
 255       (setq n-slice (1+ n-slice))
 256       (setq result
 257             (concat
 258              result
 259              (case n-slice
 260                (1  slice)
 261                (otherwise (concat " " slice))))))
 262     result))
 263
 264 (defun mml2015-gpg-extract-signature-details ()
 265   (goto-char (point-min))
 266   (let* ((expired (re-search-forward
 267                    "^\\[GNUPG:\\] SIGEXPIRED$"
 268                    nil t))
 269          (signer (and (re-search-forward
 270                        "^\\[GNUPG:\\] GOODSIG \\([0-9A-Za-z]*\\) \\(.*\\)$"
 271                        nil t)
 272                       (cons (match-string 1) (match-string 2))))
 273          (fprint (and (re-search-forward
 274                        "^\\[GNUPG:\\] VALIDSIG \\([0-9a-zA-Z]*\\) "
 275                        nil t)
 276                       (match-string 1)))
 277          (trust  (and (re-search-forward
 278                        "^\\[GNUPG:\\] \\(TRUST_.*\\)$"
 279                        nil t)
 280                       (match-string 1)))
 281          (trust-good-enough-p
 282           (cdr (assoc trust mml2015-unabbrev-trust-alist))))
 283     (cond ((and signer fprint)
 284            (concat (cdr signer)
 285                    (unless trust-good-enough-p
 286                      (concat "\nUntrusted, Fingerprint: "
 287                              (mml2015-gpg-pretty-print-fpr fprint)))
 288                    (when expired
 289                      (format "\nWARNING: Signature from expired key (%s)"
 290                              (car signer)))))
 291           ((re-search-forward
 292             "^\\(gpg: \\)?Good signature from \"\\(.*\\)\"$" nil t)
 293            (match-string 2))
 294           (t
 295            "From unknown user"))))
 296
 297 (defun mml2015-mailcrypt-clear-decrypt ()
 298   (let (result)
 299     (setq result
 300           (condition-case err
 301               (funcall mml2015-decrypt-function)
 302             (error
 303              (mm-set-handle-multipart-parameter
 304               mm-security-handle 'gnus-details (mml2015-format-error err))
 305              nil)
 306             (quit
 307              (mm-set-handle-multipart-parameter
 308               mm-security-handle 'gnus-details "Quit.")
 309              nil)))
 310     (if (car result)
 311         (mm-set-handle-multipart-parameter
 312          mm-security-handle 'gnus-info "OK")
 313       (mm-set-handle-multipart-parameter
 314        mm-security-handle 'gnus-info "Failed"))))
 315
 316 (defun mml2015-fix-micalg (alg)
 317   (and alg
 318        ;; Mutt/1.2.5i has seen sending micalg=php-sha1
 319        (upcase (if (string-match "^p[gh]p-" alg)
 320                    (substring alg (match-end 0))
 321                  alg))))
 322
 323 (defun mml2015-mailcrypt-verify (handle ctl)
 324   (catch 'error
 325     (let (part)
 326       (unless (setq part (mm-find-raw-part-by-type
 327                           ctl (or (mm-handle-multipart-ctl-parameter
 328                                    ctl 'protocol)
 329                                   "application/pgp-signature")
 330                           t))
 331         (mm-set-handle-multipart-parameter
 332          mm-security-handle 'gnus-info "Corrupted")
 333         (throw 'error handle))
 334       (with-temp-buffer
 335         (insert "-----BEGIN PGP SIGNED MESSAGE-----\n")
 336         (insert (format "Hash: %s\n\n"
 337                         (or (mml2015-fix-micalg
 338                              (mm-handle-multipart-ctl-parameter
 339                               ctl 'micalg))
 340                             "SHA1")))
 341         (save-restriction
 342           (narrow-to-region (point) (point))
 343           (insert part "\n")
 344           (goto-char (point-min))
 345           (while (not (eobp))
 346             (if (looking-at "^-")
 347                 (insert "- "))
 348             (forward-line)))
 349         (unless (setq part (mm-find-part-by-type
 350                             (cdr handle) "application/pgp-signature" nil t))
 351           (mm-set-handle-multipart-parameter
 352            mm-security-handle 'gnus-info "Corrupted")
 353           (throw 'error handle))
 354         (save-restriction
 355           (narrow-to-region (point) (point))
 356           (mm-insert-part part)
 357           (goto-char (point-min))
 358           (if (re-search-forward "^-----BEGIN PGP [^-]+-----\r?$" nil t)
 359               (replace-match "-----BEGIN PGP SIGNATURE-----" t t))
 360           (if (re-search-forward "^-----END PGP [^-]+-----\r?$" nil t)
 361               (replace-match "-----END PGP SIGNATURE-----" t t)))
 362         (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
 363           (unless (condition-case err
 364                       (prog1
 365                           (funcall mml2015-verify-function)
 366                         (if (get-buffer " *mailcrypt stderr temp")
 367                             (mm-set-handle-multipart-parameter
 368                              mm-security-handle 'gnus-details
 369                              (with-current-buffer " *mailcrypt stderr temp"
 370                                (buffer-string))))
 371                         (if (get-buffer " *mailcrypt stdout temp")
 372                             (kill-buffer " *mailcrypt stdout temp"))
 373                         (if (get-buffer " *mailcrypt stderr temp")
 374                             (kill-buffer " *mailcrypt stderr temp"))
 375                         (if (get-buffer " *mailcrypt status temp")
 376                             (kill-buffer " *mailcrypt status temp"))
 377                         (if (get-buffer mc-gpg-debug-buffer)
 378                             (kill-buffer mc-gpg-debug-buffer)))
 379                     (error
 380                      (mm-set-handle-multipart-parameter
 381                       mm-security-handle 'gnus-details (mml2015-format-error err))
 382                      nil)
 383                     (quit
 384                      (mm-set-handle-multipart-parameter
 385                       mm-security-handle 'gnus-details "Quit.")
 386                      nil))
 387             (mm-set-handle-multipart-parameter
 388              mm-security-handle 'gnus-info "Failed")
 389             (throw 'error handle))))
 390       (mm-set-handle-multipart-parameter
 391        mm-security-handle 'gnus-info "OK")
 392       handle)))
 393
 394 (defun mml2015-mailcrypt-clear-verify ()
 395   (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
 396     (if (condition-case err
 397             (prog1
 398                 (funcall mml2015-verify-function)
 399               (if (get-buffer " *mailcrypt stderr temp")
 400                   (mm-set-handle-multipart-parameter
 401                    mm-security-handle 'gnus-details
 402                    (with-current-buffer " *mailcrypt stderr temp"
 403                      (buffer-string))))
 404               (if (get-buffer " *mailcrypt stdout temp")
 405                   (kill-buffer " *mailcrypt stdout temp"))
 406               (if (get-buffer " *mailcrypt stderr temp")
 407                   (kill-buffer " *mailcrypt stderr temp"))
 408               (if (get-buffer " *mailcrypt status temp")
 409                   (kill-buffer " *mailcrypt status temp"))
 410               (if (get-buffer mc-gpg-debug-buffer)
 411                   (kill-buffer mc-gpg-debug-buffer)))
 412           (error
 413            (mm-set-handle-multipart-parameter
 414             mm-security-handle 'gnus-details (mml2015-format-error err))
 415            nil)
 416           (quit
 417            (mm-set-handle-multipart-parameter
 418             mm-security-handle 'gnus-details "Quit.")
 419            nil))
 420         (mm-set-handle-multipart-parameter
 421          mm-security-handle 'gnus-info "OK")
 422       (mm-set-handle-multipart-parameter
 423        mm-security-handle 'gnus-info "Failed")))
 424   (mml2015-extract-cleartext-signature))
 425
 426 (defun mml2015-mailcrypt-sign (cont)
 427   (mc-sign-generic (message-options-get 'message-sender)
 428                    nil nil nil nil)
 429   (let ((boundary (mml-compute-boundary cont))
 430         hash point)
 431     (goto-char (point-min))
 432     (unless (re-search-forward "^-----BEGIN PGP SIGNED MESSAGE-----\r?$" nil t)
 433       (error "Cannot find signed begin line"))
 434     (goto-char (match-beginning 0))
 435     (forward-line 1)
 436     (unless (looking-at "Hash:[ \t]*\\([a-zA-Z0-9]+\\)")
 437       (error "Cannot not find PGP hash"))
 438     (setq hash (match-string 1))
 439     (unless (re-search-forward "^$" nil t)
 440       (error "Cannot not find PGP message"))
 441     (forward-line 1)
 442     (delete-region (point-min) (point))
 443     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 444                     boundary))
 445     (insert (format "\tmicalg=pgp-%s; protocol=\"application/pgp-signature\"\n"
 446                     (downcase hash)))
 447     (insert (format "\n--%s\n" boundary))
 448     (setq point (point))
 449     (goto-char (point-max))
 450     (unless (re-search-backward "^-----END PGP SIGNATURE-----\r?$" nil t)
 451       (error "Cannot find signature part"))
 452     (replace-match "-----END PGP MESSAGE-----" t t)
 453     (goto-char (match-beginning 0))
 454     (unless (re-search-backward "^-----BEGIN PGP SIGNATURE-----\r?$"
 455                                 nil t)
 456       (error "Cannot find signature part"))
 457     (replace-match "-----BEGIN PGP MESSAGE-----" t t)
 458     (goto-char (match-beginning 0))
 459     (save-restriction
 460       (narrow-to-region point (point))
 461       (goto-char point)
 462       (while (re-search-forward "^- -" nil t)
 463         (replace-match "-" t t))
 464       (goto-char (point-max)))
 465     (insert (format "--%s\n" boundary))
 466     (insert "Content-Type: application/pgp-signature\n\n")
 467     (goto-char (point-max))
 468     (insert (format "--%s--\n" boundary))
 469     (goto-char (point-max))))
 470
 471 ;; We require mm-decode, which requires mm-bodies, which autoloads
 472 ;; message-options-get (!).
 473 (declare-function message-options-set "message" (symbol value))
 474
 475 (defun mml2015-mailcrypt-encrypt (cont &optional sign)
 476   (let ((mc-pgp-always-sign
 477          (or mc-pgp-always-sign
 478              sign
 479              (eq t (or (message-options-get 'message-sign-encrypt)
 480                        (message-options-set
 481                         'message-sign-encrypt
 482                         (or (y-or-n-p "Sign the message? ")
 483                             'not))))
 484              'never)))
 485     (mm-with-unibyte-current-buffer
 486       (mc-encrypt-generic
 487        (or (message-options-get 'message-recipients)
 488            (message-options-set 'message-recipients
 489                               (mc-cleanup-recipient-headers
 490                                (read-string "Recipients: "))))
 491        nil nil nil
 492        (message-options-get 'message-sender))))
 493   (goto-char (point-min))
 494   (unless (looking-at "-----BEGIN PGP MESSAGE-----")
 495     (error "Fail to encrypt the message"))
 496   (let ((boundary (mml-compute-boundary cont)))
 497     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
 498                     boundary))
 499     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
 500     (insert (format "--%s\n" boundary))
 501     (insert "Content-Type: application/pgp-encrypted\n\n")
 502     (insert "Version: 1\n\n")
 503     (insert (format "--%s\n" boundary))
 504     (insert "Content-Type: application/octet-stream\n\n")
 505     (goto-char (point-max))
 506     (insert (format "--%s--\n" boundary))
 507     (goto-char (point-max))))
 508
 509 ;;; pgg wrapper
 510
 511 (defvar pgg-default-user-id)
 512 (defvar pgg-errors-buffer)
 513 (defvar pgg-output-buffer)
 514
 515 (autoload 'pgg-decrypt-region "pgg")
 516 (autoload 'pgg-verify-region "pgg")
 517 (autoload 'pgg-sign-region "pgg")
 518 (autoload 'pgg-encrypt-region "pgg")
 519 (autoload 'pgg-parse-armor "pgg-parse")
 520
 521 (defun mml2015-pgg-decrypt (handle ctl)
 522   (catch 'error
 523     (let ((pgg-errors-buffer mml2015-result-buffer)
 524           child handles result decrypt-status)
 525       (unless (setq child (mm-find-part-by-type
 526                            (cdr handle)
 527                            "application/octet-stream" nil t))
 528         (mm-set-handle-multipart-parameter
 529          mm-security-handle 'gnus-info "Corrupted")
 530         (throw 'error handle))
 531       (with-temp-buffer
 532         (mm-insert-part child)
 533         (if (condition-case err
 534                 (prog1
 535                     (pgg-decrypt-region (point-min) (point-max))
 536                   (setq decrypt-status
 537                         (with-current-buffer mml2015-result-buffer
 538                           (buffer-string)))
 539                   (mm-set-handle-multipart-parameter
 540                    mm-security-handle 'gnus-details
 541                    decrypt-status))
 542               (error
 543                (mm-set-handle-multipart-parameter
 544                 mm-security-handle 'gnus-details (mml2015-format-error err))
 545                nil)
 546               (quit
 547                (mm-set-handle-multipart-parameter
 548                 mm-security-handle 'gnus-details "Quit.")
 549                nil))
 550             (with-current-buffer pgg-output-buffer
 551               (goto-char (point-min))
 552               (while (search-forward "\r\n" nil t)
 553                 (replace-match "\n" t t))
 554               (setq handles (mm-dissect-buffer t))
 555               (mm-destroy-parts handle)
 556               (mm-set-handle-multipart-parameter
 557                mm-security-handle 'gnus-info "OK")
 558               (mm-set-handle-multipart-parameter
 559                mm-security-handle 'gnus-details
 560                (concat decrypt-status
 561                        (when (stringp (car handles))
 562                          "\n" (mm-handle-multipart-ctl-parameter
 563                                handles 'gnus-details))))
 564               (if (listp (car handles))
 565                   handles
 566                 (list handles)))
 567           (mm-set-handle-multipart-parameter
 568            mm-security-handle 'gnus-info "Failed")
 569           (throw 'error handle))))))
 570
 571 (defun mml2015-pgg-clear-decrypt ()
 572   (let ((pgg-errors-buffer mml2015-result-buffer))
 573     (if (prog1
 574             (pgg-decrypt-region (point-min) (point-max))
 575           (mm-set-handle-multipart-parameter
 576            mm-security-handle 'gnus-details
 577            (with-current-buffer mml2015-result-buffer
 578              (buffer-string))))
 579         (progn
 580           (erase-buffer)
 581           ;; Treat data which pgg returns as a unibyte string.
 582           (mm-disable-multibyte)
 583           (insert-buffer-substring pgg-output-buffer)
 584           (goto-char (point-min))
 585           (while (search-forward "\r\n" nil t)
 586             (replace-match "\n" t t))
 587           (mm-set-handle-multipart-parameter
 588            mm-security-handle 'gnus-info "OK"))
 589       (mm-set-handle-multipart-parameter
 590        mm-security-handle 'gnus-info "Failed"))))
 591
 592 (defun mml2015-pgg-verify (handle ctl)
 593   (let ((pgg-errors-buffer mml2015-result-buffer)
 594         signature-file part signature)
 595     (if (or (null (setq part (mm-find-raw-part-by-type
 596                               ctl (or (mm-handle-multipart-ctl-parameter
 597                                        ctl 'protocol)
 598                                       "application/pgp-signature")
 599                               t)))
 600             (null (setq signature (mm-find-part-by-type
 601                                    (cdr handle) "application/pgp-signature" nil t))))
 602         (progn
 603           (mm-set-handle-multipart-parameter
 604            mm-security-handle 'gnus-info "Corrupted")
 605           handle)
 606       (with-temp-buffer
 607         (insert part)
 608         ;; Convert <LF> to <CR><LF> in signed text.  If --textmode is
 609         ;; specified when signing, the conversion is not necessary.
 610         (goto-char (point-min))
 611         (end-of-line)
 612         (while (not (eobp))
 613           (unless (eq (char-before) ?\r)
 614             (insert "\r"))
 615           (forward-line)
 616           (end-of-line))
 617         (with-temp-file (setq signature-file (mm-make-temp-file "pgg"))
 618           (mm-insert-part signature))
 619         (if (condition-case err
 620                 (prog1
 621                     (pgg-verify-region (point-min) (point-max)
 622                                        signature-file t)
 623                   (goto-char (point-min))
 624                   (while (search-forward "\r\n" nil t)
 625                     (replace-match "\n" t t))
 626                   (mm-set-handle-multipart-parameter
 627                    mm-security-handle 'gnus-details
 628                    (concat (with-current-buffer pgg-output-buffer
 629                              (buffer-string))
 630                            (with-current-buffer pgg-errors-buffer
 631                              (buffer-string)))))
 632               (error
 633                (mm-set-handle-multipart-parameter
 634                 mm-security-handle 'gnus-details (mml2015-format-error err))
 635                nil)
 636               (quit
 637                (mm-set-handle-multipart-parameter
 638                 mm-security-handle 'gnus-details "Quit.")
 639                nil))
 640             (progn
 641               (delete-file signature-file)
 642               (mm-set-handle-multipart-parameter
 643                mm-security-handle 'gnus-info
 644                (with-current-buffer pgg-errors-buffer
 645                  (mml2015-gpg-extract-signature-details))))
 646           (delete-file signature-file)
 647           (mm-set-handle-multipart-parameter
 648            mm-security-handle 'gnus-info "Failed")))))
 649   handle)
 650
 651 (defun mml2015-pgg-clear-verify ()
 652   (let ((pgg-errors-buffer mml2015-result-buffer)
 653         (text (buffer-string))
 654         (coding-system buffer-file-coding-system))
 655     (if (condition-case err
 656             (prog1
 657                 (mm-with-unibyte-buffer
 658                   (insert (mm-encode-coding-string text coding-system))
 659                   (pgg-verify-region (point-min) (point-max) nil t))
 660               (goto-char (point-min))
 661               (while (search-forward "\r\n" nil t)
 662                 (replace-match "\n" t t))
 663               (mm-set-handle-multipart-parameter
 664                mm-security-handle 'gnus-details
 665                (concat (with-current-buffer pgg-output-buffer
 666                          (buffer-string))
 667                        (with-current-buffer pgg-errors-buffer
 668                          (buffer-string)))))
 669           (error
 670            (mm-set-handle-multipart-parameter
 671             mm-security-handle 'gnus-details (mml2015-format-error err))
 672            nil)
 673           (quit
 674            (mm-set-handle-multipart-parameter
 675             mm-security-handle 'gnus-details "Quit.")
 676            nil))
 677         (mm-set-handle-multipart-parameter
 678          mm-security-handle 'gnus-info
 679          (with-current-buffer pgg-errors-buffer
 680            (mml2015-gpg-extract-signature-details)))
 681       (mm-set-handle-multipart-parameter
 682        mm-security-handle 'gnus-info "Failed")))
 683   (mml2015-extract-cleartext-signature))
 684
 685 (defun mml2015-pgg-sign (cont)
 686   (let ((pgg-errors-buffer mml2015-result-buffer)
 687         (boundary (mml-compute-boundary cont))
 688         (pgg-default-user-id (or (message-options-get 'mml-sender)
 689                                  pgg-default-user-id))
 690         (pgg-text-mode t)
 691         entry)
 692     (unless (pgg-sign-region (point-min) (point-max))
 693       (pop-to-buffer mml2015-result-buffer)
 694       (error "Sign error"))
 695     (goto-char (point-min))
 696     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 697                     boundary))
 698     (if (setq entry (assq 2 (pgg-parse-armor
 699                              (with-current-buffer pgg-output-buffer
 700                                (buffer-string)))))
 701         (setq entry (assq 'hash-algorithm (cdr entry))))
 702     (insert (format "\tmicalg=%s; "
 703                     (if (cdr entry)
 704                         (downcase (format "pgp-%s" (cdr entry)))
 705                       "pgp-sha1")))
 706     (insert "protocol=\"application/pgp-signature\"\n")
 707     (insert (format "\n--%s\n" boundary))
 708     (goto-char (point-max))
 709     (insert (format "\n--%s\n" boundary))
 710     (insert "Content-Type: application/pgp-signature\n\n")
 711     (insert-buffer-substring pgg-output-buffer)
 712     (goto-char (point-max))
 713     (insert (format "--%s--\n" boundary))
 714     (goto-char (point-max))))
 715
 716 (defun mml2015-pgg-encrypt (cont &optional sign)
 717   (let ((pgg-errors-buffer mml2015-result-buffer)
 718         (pgg-text-mode t)
 719         (boundary (mml-compute-boundary cont)))
 720     (unless (pgg-encrypt-region (point-min) (point-max)
 721                                 (split-string
 722                                  (or
 723                                   (message-options-get 'message-recipients)
 724                                   (message-options-set 'message-recipients
 725                                                        (read-string "Recipients: ")))
 726                                  "[ \f\t\n\r\v,]+")
 727                                 sign)
 728       (pop-to-buffer mml2015-result-buffer)
 729       (error "Encrypt error"))
 730     (delete-region (point-min) (point-max))
 731     (goto-char (point-min))
 732     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
 733                     boundary))
 734     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
 735     (insert (format "--%s\n" boundary))
 736     (insert "Content-Type: application/pgp-encrypted\n\n")
 737     (insert "Version: 1\n\n")
 738     (insert (format "--%s\n" boundary))
 739     (insert "Content-Type: application/octet-stream\n\n")
 740     (insert-buffer-substring pgg-output-buffer)
 741     (goto-char (point-max))
 742     (insert (format "--%s--\n" boundary))
 743     (goto-char (point-max))))
 744
 745 ;;; epg wrapper
 746
 747 (defvar epg-user-id-alist)
 748 (defvar epg-digest-algorithm-alist)
 749 (defvar epg-gpg-program)
 750 (defvar inhibit-redisplay)
 751
 752 (autoload 'epg-make-context "epg")
 753 (autoload 'epg-context-set-armor "epg")
 754 (autoload 'epg-context-set-textmode "epg")
 755 (autoload 'epg-context-set-signers "epg")
 756 (autoload 'epg-context-result-for "epg")
 757 (autoload 'epg-new-signature-digest-algorithm "epg")
 758 (autoload 'epg-list-keys "epg")
 759 (autoload 'epg-decrypt-string "epg")
 760 (autoload 'epg-verify-string "epg")
 761 (autoload 'epg-sign-string "epg")
 762 (autoload 'epg-encrypt-string "epg")
 763 (autoload 'epg-passphrase-callback-function "epg")
 764 (autoload 'epg-context-set-passphrase-callback "epg")
 765 (autoload 'epg-key-sub-key-list "epg")
 766 (autoload 'epg-sub-key-capability "epg")
 767 (autoload 'epg-sub-key-validity "epg")
 768 (autoload 'epg-sub-key-fingerprint "epg")
 769 (autoload 'epg-signature-key-id "epg")
 770 (autoload 'epg-signature-to-string "epg")
 771 (autoload 'epg-key-user-id-list "epg")
 772 (autoload 'epg-user-id-string "epg")
 773 (autoload 'epg-user-id-validity "epg")
 774 (autoload 'epg-configuration "epg-config")
 775 (autoload 'epg-expand-group "epg-config")
 776 (autoload 'epa-select-keys "epa")
 777
 778 (autoload 'gnus-create-image "gnus-ems")
 779
 780 (defun mml2015-epg-key-image (key-id)
 781   "Return the image of a key, if any"
 782   (with-temp-buffer
 783     (mm-set-buffer-multibyte nil)
 784     (let* ((coding-system-for-write 'binary)
 785            (coding-system-for-read 'binary)
 786            (data (shell-command-to-string
 787                   (format "%s --list-options no-show-photos --attribute-fd 3 --list-keys %s 3>&1 >/dev/null 2>&1"
 788                           (shell-quote-argument epg-gpg-program) key-id))))
 789       (when (> (length data) 0)
 790         (insert (substring data 16))
 791         (condition-case nil
 792             (gnus-create-image (buffer-string) nil t)
 793           (error))))))
 794
 795 (autoload 'gnus-rescale-image "gnus-util")
 796
 797 (defun mml2015-epg-key-image-to-string (key-id)
 798   "Return a string with the image of a key, if any"
 799   (let ((key-image (mml2015-epg-key-image key-id)))
 800     (if (not key-image)
 801         ""
 802       (condition-case error
 803           (let ((result "  "))
 804             (put-text-property
 805              1 2 'display
 806              (gnus-rescale-image key-image
 807                                  (cons mml2015-maximum-key-image-dimension
 808                                        mml2015-maximum-key-image-dimension))
 809              result)
 810             result)
 811         (error "")))))
 812
 813 (defun mml2015-epg-signature-to-string (signature)
 814   (concat (epg-signature-to-string signature)
 815           (when mml2015-display-key-image
 816             (mml2015-epg-key-image-to-string (epg-signature-key-id signature)))))
 817
 818 (defun mml2015-epg-verify-result-to-string (verify-result)
 819   (mapconcat #'mml2015-epg-signature-to-string verify-result "\n"))
 820
 821 (defun mml2015-epg-decrypt (handle ctl)
 822   (catch 'error
 823     (let ((inhibit-redisplay t)
 824           context plain child handles result decrypt-status)
 825       (unless (setq child (mm-find-part-by-type
 826                            (cdr handle)
 827                            "application/octet-stream" nil t))
 828         (mm-set-handle-multipart-parameter
 829          mm-security-handle 'gnus-info "Corrupted")
 830         (throw 'error handle))
 831       (setq context (epg-make-context))
 832       (if (or mml2015-cache-passphrase mml-secure-cache-passphrase)
 833           (epg-context-set-passphrase-callback
 834            context
 835            (cons 'mml-secure-passphrase-callback 'OpenPGP)))
 836       (condition-case error
 837           (setq plain (epg-decrypt-string context (mm-get-part child))
 838                 mml-secure-secret-key-id-list nil)
 839         (error
 840          (mml-secure-clear-secret-key-id-list)
 841          (mm-set-handle-multipart-parameter
 842           mm-security-handle 'gnus-info "Failed")
 843          (if (eq (car error) 'quit)
 844              (mm-set-handle-multipart-parameter
 845               mm-security-handle 'gnus-details "Quit.")
 846            (mm-set-handle-multipart-parameter
 847             mm-security-handle 'gnus-details (mml2015-format-error error)))
 848          (throw 'error handle)))
 849       (with-temp-buffer
 850         (insert plain)
 851         (goto-char (point-min))
 852         (while (search-forward "\r\n" nil t)
 853           (replace-match "\n" t t))
 854         (setq handles (mm-dissect-buffer t))
 855         (mm-destroy-parts handle)
 856         (if (epg-context-result-for context 'verify)
 857             (mm-set-handle-multipart-parameter
 858              mm-security-handle 'gnus-info
 859              (concat "OK\n"
 860                      (mml2015-epg-verify-result-to-string
 861                       (epg-context-result-for context 'verify))))
 862           (mm-set-handle-multipart-parameter
 863            mm-security-handle 'gnus-info "OK"))
 864         (if (stringp (car handles))
 865             (mm-set-handle-multipart-parameter
 866              mm-security-handle 'gnus-details
 867              (mm-handle-multipart-ctl-parameter handles 'gnus-details))))
 868         (if (listp (car handles))
 869             handles
 870           (list handles)))))
 871
 872 (defun mml2015-epg-clear-decrypt ()
 873   (let ((inhibit-redisplay t)
 874         (context (epg-make-context))
 875         plain)
 876     (if (or mml2015-cache-passphrase mml-secure-cache-passphrase)
 877         (epg-context-set-passphrase-callback
 878          context
 879          (cons 'mml-secure-passphrase-callback 'OpenPGP)))
 880     (condition-case error
 881         (setq plain (epg-decrypt-string context (buffer-string))
 882               mml-secure-secret-key-id-list nil)
 883       (error
 884        (mml-secure-clear-secret-key-id-list)
 885        (mm-set-handle-multipart-parameter
 886         mm-security-handle 'gnus-info "Failed")
 887        (if (eq (car error) 'quit)
 888            (mm-set-handle-multipart-parameter
 889             mm-security-handle 'gnus-details "Quit.")
 890          (mm-set-handle-multipart-parameter
 891           mm-security-handle 'gnus-details (mml2015-format-error error)))))
 892     (when plain
 893       (erase-buffer)
 894       ;; Treat data which epg returns as a unibyte string.
 895       (mm-disable-multibyte)
 896       (insert plain)
 897       (goto-char (point-min))
 898       (while (search-forward "\r\n" nil t)
 899         (replace-match "\n" t t))
 900       (mm-set-handle-multipart-parameter
 901        mm-security-handle 'gnus-info "OK")
 902       (if (epg-context-result-for context 'verify)
 903           (mm-set-handle-multipart-parameter
 904            mm-security-handle 'gnus-details
 905            (mml2015-epg-verify-result-to-string
 906             (epg-context-result-for context 'verify)))))))
 907
 908 (defun mml2015-epg-verify (handle ctl)
 909   (catch 'error
 910     (let ((inhibit-redisplay t)
 911           context plain signature-file part signature)
 912       (when (or (null (setq part (mm-find-raw-part-by-type
 913                                   ctl (or (mm-handle-multipart-ctl-parameter
 914                                            ctl 'protocol)
 915                                           "application/pgp-signature")
 916                                   t)))
 917                 (null (setq signature (mm-find-part-by-type
 918                                        (cdr handle) "application/pgp-signature"
 919                                        nil t))))
 920         (mm-set-handle-multipart-parameter
 921          mm-security-handle 'gnus-info "Corrupted")
 922         (throw 'error handle))
 923       (setq part (mm-replace-in-string part "\n" "\r\n")
 924             signature (mm-get-part signature)
 925             context (epg-make-context))
 926       (condition-case error
 927           (setq plain (epg-verify-string context signature part))
 928         (error
 929          (mm-set-handle-multipart-parameter
 930           mm-security-handle 'gnus-info "Failed")
 931          (if (eq (car error) 'quit)
 932              (mm-set-handle-multipart-parameter
 933               mm-security-handle 'gnus-details "Quit.")
 934            (mm-set-handle-multipart-parameter
 935             mm-security-handle 'gnus-details (mml2015-format-error error)))
 936          (throw 'error handle)))
 937       (mm-set-handle-multipart-parameter
 938        mm-security-handle 'gnus-info
 939        (mml2015-epg-verify-result-to-string
 940         (epg-context-result-for context 'verify)))
 941       handle)))
 942
 943 (defun mml2015-epg-clear-verify ()
 944   (let ((inhibit-redisplay t)
 945         (context (epg-make-context))
 946         (signature (mm-encode-coding-string (buffer-string)
 947                                             coding-system-for-write))
 948         plain)
 949     (condition-case error
 950         (setq plain (epg-verify-string context signature))
 951       (error
 952        (mm-set-handle-multipart-parameter
 953         mm-security-handle 'gnus-info "Failed")
 954        (if (eq (car error) 'quit)
 955            (mm-set-handle-multipart-parameter
 956             mm-security-handle 'gnus-details "Quit.")
 957          (mm-set-handle-multipart-parameter
 958           mm-security-handle 'gnus-details (mml2015-format-error error)))))
 959     (if plain
 960         (progn
 961           (mm-set-handle-multipart-parameter
 962            mm-security-handle 'gnus-info
 963            (mml2015-epg-verify-result-to-string
 964             (epg-context-result-for context 'verify)))
 965           (delete-region (point-min) (point-max))
 966           (insert (mm-decode-coding-string plain coding-system-for-read)))
 967       (mml2015-extract-cleartext-signature))))
 968
 969 (defun mml2015-epg-sign (cont)
 970   (let ((inhibit-redisplay t)
 971         (boundary (mml-compute-boundary cont)))
 972     ;; Signed data must end with a newline (RFC 3156, 5).
 973     (goto-char (point-max))
 974     (unless (bolp)
 975       (insert "\n"))
 976     (let* ((pair (mml-secure-epg-sign 'OpenPGP t))
 977            (signature (car pair))
 978            (micalg (cdr pair)))
 979       (goto-char (point-min))
 980       (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 981                       boundary))
 982       (if micalg
 983           (insert (format "\tmicalg=pgp-%s; "
 984                           (downcase
 985                            (cdr (assq micalg
 986                                       epg-digest-algorithm-alist))))))
 987       (insert "protocol=\"application/pgp-signature\"\n")
 988       (insert (format "\n--%s\n" boundary))
 989       (goto-char (point-max))
 990       (insert (format "\n--%s\n" boundary))
 991       (insert "Content-Type: application/pgp-signature; name=\"signature.asc\"\n\n")
 992       (insert signature)
 993       (goto-char (point-max))
 994       (insert (format "--%s--\n" boundary))
 995       (goto-char (point-max)))))
 996
 997 (defun mml2015-epg-encrypt (cont &optional sign)
 998   (let* ((inhibit-redisplay t)
 999          (boundary (mml-compute-boundary cont))
1000          (cipher (mml-secure-epg-encrypt 'OpenPGP cont sign)))
1001     (delete-region (point-min) (point-max))
1002     (goto-char (point-min))
1003     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
1004                     boundary))
1005     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
1006     (insert (format "--%s\n" boundary))
1007     (insert "Content-Type: application/pgp-encrypted\n\n")
1008     (insert "Version: 1\n\n")
1009     (insert (format "--%s\n" boundary))
1010     (insert "Content-Type: application/octet-stream\n\n")
1011     (insert cipher)
1012     (goto-char (point-max))
1013     (insert (format "--%s--\n" boundary))
1014     (goto-char (point-max))))
1015
1016 ;;; General wrapper
1017
1018 (autoload 'gnus-buffer-live-p "gnus-util")
1019 (autoload 'gnus-get-buffer-create "gnus")
1020
1021 (defun mml2015-clean-buffer ()
1022   (if (gnus-buffer-live-p mml2015-result-buffer)
1023       (with-current-buffer mml2015-result-buffer
1024         (erase-buffer)
1025         t)
1026     (setq mml2015-result-buffer
1027           (gnus-get-buffer-create " *MML2015 Result*"))
1028     nil))
1029
1030 (defsubst mml2015-clear-decrypt-function ()
1031   (nth 6 (assq mml2015-use mml2015-function-alist)))
1032
1033 (defsubst mml2015-clear-verify-function ()
1034   (nth 5 (assq mml2015-use mml2015-function-alist)))
1035
1036 ;;;###autoload
1037 (defun mml2015-decrypt (handle ctl)
1038   (mml2015-clean-buffer)
1039   (let ((func (nth 4 (assq mml2015-use mml2015-function-alist))))
1040     (if func
1041         (funcall func handle ctl)
1042       handle)))
1043
1044 ;;;###autoload
1045 (defun mml2015-decrypt-test (handle ctl)
1046   mml2015-use)
1047
1048 ;;;###autoload
1049 (defun mml2015-verify (handle ctl)
1050   (mml2015-clean-buffer)
1051   (let ((func (nth 3 (assq mml2015-use mml2015-function-alist))))
1052     (if func
1053         (funcall func handle ctl)
1054       handle)))
1055
1056 ;;;###autoload
1057 (defun mml2015-verify-test (handle ctl)
1058   mml2015-use)
1059
1060 ;;;###autoload
1061 (defun mml2015-encrypt (cont &optional sign)
1062   (mml2015-clean-buffer)
1063   (let ((func (nth 2 (assq mml2015-use mml2015-function-alist))))
1064     (if func
1065         (funcall func cont sign)
1066       (error "Cannot find encrypt function"))))
1067
1068 ;;;###autoload
1069 (defun mml2015-sign (cont)
1070   (mml2015-clean-buffer)
1071   (let ((func (nth 1 (assq mml2015-use mml2015-function-alist))))
1072     (if func
1073         (funcall func cont)
1074       (error "Cannot find sign function"))))
1075
1076 ;;;###autoload
1077 (defun mml2015-self-encrypt ()
1078   (mml2015-encrypt nil))
1079
1080 (provide 'mml2015)
1081
1082 ;;; mml2015.el ends here