lisp/gnus/mml2015.el

   1 ;;; mml2015.el --- MIME Security with Pretty Good Privacy (PGP)
   2
   3 ;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
   7 ;; Keywords: PGP MIME MML
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published
  13 ;; by the Free Software Foundation; either version 3, or (at your
  14 ;; option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful, but
  17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19 ;; General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; RFC 2015 is updated by RFC 3156, this file should be compatible
  29 ;; with both.
  30
  31 ;;; Code:
  32
  33 (eval-when-compile (require 'cl))
  34 (require 'mm-decode)
  35 (require 'mm-util)
  36 (require 'mml)
  37
  38 (defvar mc-pgp-always-sign)
  39
  40 (defvar mml2015-use (or
  41                      (progn
  42                        (ignore-errors
  43                          (require 'pgg))
  44                        (and (fboundp 'pgg-sign-region)
  45                             'pgg))
  46                      (progn
  47                        (ignore-errors
  48                          (require 'gpg))
  49                        (and (fboundp 'gpg-sign-detached)
  50                             'gpg))
  51                      (progn (ignore-errors
  52                               (load "mc-toplev"))
  53                             (and (fboundp 'mc-encrypt-generic)
  54                                  (fboundp 'mc-sign-generic)
  55                                  (fboundp 'mc-cleanup-recipient-headers)
  56                                  'mailcrypt)))
  57   "The package used for PGP/MIME.")
  58
  59 ;; Something is not RFC2015.
  60 (defvar mml2015-function-alist
  61   '((mailcrypt mml2015-mailcrypt-sign
  62                mml2015-mailcrypt-encrypt
  63                mml2015-mailcrypt-verify
  64                mml2015-mailcrypt-decrypt
  65                mml2015-mailcrypt-clear-verify
  66                mml2015-mailcrypt-clear-decrypt)
  67     (gpg mml2015-gpg-sign
  68          mml2015-gpg-encrypt
  69          mml2015-gpg-verify
  70          mml2015-gpg-decrypt
  71          mml2015-gpg-clear-verify
  72          mml2015-gpg-clear-decrypt)
  73   (pgg mml2015-pgg-sign
  74        mml2015-pgg-encrypt
  75        mml2015-pgg-verify
  76        mml2015-pgg-decrypt
  77        mml2015-pgg-clear-verify
  78        mml2015-pgg-clear-decrypt))
  79   "Alist of PGP/MIME functions.")
  80
  81 (defvar mml2015-result-buffer nil)
  82
  83 (defcustom mml2015-unabbrev-trust-alist
  84   '(("TRUST_UNDEFINED" . nil)
  85     ("TRUST_NEVER"     . nil)
  86     ("TRUST_MARGINAL"  . t)
  87     ("TRUST_FULLY"     . t)
  88     ("TRUST_ULTIMATE"  . t))
  89   "Map GnuPG trust output values to a boolean saying if you trust the key."
  90   :version "22.1"
  91   :group 'mime-security
  92   :type '(repeat (cons (regexp :tag "GnuPG output regexp")
  93                        (boolean :tag "Trust key"))))
  94
  95 ;;; mailcrypt wrapper
  96
  97 (eval-and-compile
  98   (autoload 'mailcrypt-decrypt "mailcrypt")
  99   (autoload 'mailcrypt-verify "mailcrypt")
 100   (autoload 'mc-pgp-always-sign "mailcrypt")
 101   (autoload 'mc-encrypt-generic "mc-toplev")
 102   (autoload 'mc-cleanup-recipient-headers "mc-toplev")
 103   (autoload 'mc-sign-generic "mc-toplev"))
 104
 105 (eval-when-compile
 106   (defvar mc-default-scheme)
 107   (defvar mc-schemes))
 108
 109 (defvar mml2015-decrypt-function 'mailcrypt-decrypt)
 110 (defvar mml2015-verify-function 'mailcrypt-verify)
 111
 112 (defun mml2015-format-error (err)
 113   (if (stringp (cadr err))
 114       (cadr err)
 115     (format "%S" (cdr err))))
 116
 117 (defun mml2015-mailcrypt-decrypt (handle ctl)
 118   (catch 'error
 119     (let (child handles result)
 120       (unless (setq child (mm-find-part-by-type
 121                            (cdr handle)
 122                            "application/octet-stream" nil t))
 123         (mm-set-handle-multipart-parameter
 124          mm-security-handle 'gnus-info "Corrupted")
 125         (throw 'error handle))
 126       (with-temp-buffer
 127         (mm-insert-part child)
 128         (setq result
 129               (condition-case err
 130                   (funcall mml2015-decrypt-function)
 131                 (error
 132                  (mm-set-handle-multipart-parameter
 133                   mm-security-handle 'gnus-details (mml2015-format-error err))
 134                  nil)
 135                 (quit
 136                  (mm-set-handle-multipart-parameter
 137                   mm-security-handle 'gnus-details "Quit.")
 138                  nil)))
 139         (unless (car result)
 140           (mm-set-handle-multipart-parameter
 141            mm-security-handle 'gnus-info "Failed")
 142           (throw 'error handle))
 143         (setq handles (mm-dissect-buffer t)))
 144       (mm-destroy-parts handle)
 145       (mm-set-handle-multipart-parameter
 146        mm-security-handle 'gnus-info
 147        (concat "OK"
 148                (let ((sig (with-current-buffer mml2015-result-buffer
 149                             (mml2015-gpg-extract-signature-details))))
 150                  (concat ", Signer: " sig))))
 151       (if (listp (car handles))
 152           handles
 153         (list handles)))))
 154
 155 (defun mml2015-mailcrypt-clear-decrypt ()
 156   (let (result)
 157     (setq result
 158           (condition-case err
 159               (funcall mml2015-decrypt-function)
 160             (error
 161              (mm-set-handle-multipart-parameter
 162               mm-security-handle 'gnus-details (mml2015-format-error err))
 163              nil)
 164             (quit
 165              (mm-set-handle-multipart-parameter
 166               mm-security-handle 'gnus-details "Quit.")
 167              nil)))
 168     (if (car result)
 169         (mm-set-handle-multipart-parameter
 170          mm-security-handle 'gnus-info "OK")
 171       (mm-set-handle-multipart-parameter
 172        mm-security-handle 'gnus-info "Failed"))))
 173
 174 (defun mml2015-fix-micalg (alg)
 175   (and alg
 176        ;; Mutt/1.2.5i has seen sending micalg=php-sha1
 177        (upcase (if (string-match "^p[gh]p-" alg)
 178                    (substring alg (match-end 0))
 179                  alg))))
 180
 181 (defun mml2015-mailcrypt-verify (handle ctl)
 182   (catch 'error
 183     (let (part)
 184       (unless (setq part (mm-find-raw-part-by-type
 185                           ctl (or (mm-handle-multipart-ctl-parameter
 186                                    ctl 'protocol)
 187                                   "application/pgp-signature")
 188                           t))
 189         (mm-set-handle-multipart-parameter
 190          mm-security-handle 'gnus-info "Corrupted")
 191         (throw 'error handle))
 192       (with-temp-buffer
 193         (insert "-----BEGIN PGP SIGNED MESSAGE-----\n")
 194         (insert (format "Hash: %s\n\n"
 195                         (or (mml2015-fix-micalg
 196                              (mm-handle-multipart-ctl-parameter
 197                               ctl 'micalg))
 198                             "SHA1")))
 199         (save-restriction
 200           (narrow-to-region (point) (point))
 201           (insert part "\n")
 202           (goto-char (point-min))
 203           (while (not (eobp))
 204             (if (looking-at "^-")
 205                 (insert "- "))
 206             (forward-line)))
 207         (unless (setq part (mm-find-part-by-type
 208                             (cdr handle) "application/pgp-signature" nil t))
 209           (mm-set-handle-multipart-parameter
 210            mm-security-handle 'gnus-info "Corrupted")
 211           (throw 'error handle))
 212         (save-restriction
 213           (narrow-to-region (point) (point))
 214           (mm-insert-part part)
 215           (goto-char (point-min))
 216           (if (re-search-forward "^-----BEGIN PGP [^-]+-----\r?$" nil t)
 217               (replace-match "-----BEGIN PGP SIGNATURE-----" t t))
 218           (if (re-search-forward "^-----END PGP [^-]+-----\r?$" nil t)
 219               (replace-match "-----END PGP SIGNATURE-----" t t)))
 220         (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
 221           (unless (condition-case err
 222                       (prog1
 223                           (funcall mml2015-verify-function)
 224                         (if (get-buffer " *mailcrypt stderr temp")
 225                             (mm-set-handle-multipart-parameter
 226                              mm-security-handle 'gnus-details
 227                              (with-current-buffer " *mailcrypt stderr temp"
 228                                (buffer-string))))
 229                         (if (get-buffer " *mailcrypt stdout temp")
 230                             (kill-buffer " *mailcrypt stdout temp"))
 231                         (if (get-buffer " *mailcrypt stderr temp")
 232                             (kill-buffer " *mailcrypt stderr temp"))
 233                         (if (get-buffer " *mailcrypt status temp")
 234                             (kill-buffer " *mailcrypt status temp"))
 235                         (if (get-buffer mc-gpg-debug-buffer)
 236                             (kill-buffer mc-gpg-debug-buffer)))
 237                     (error
 238                      (mm-set-handle-multipart-parameter
 239                       mm-security-handle 'gnus-details (mml2015-format-error err))
 240                      nil)
 241                     (quit
 242                      (mm-set-handle-multipart-parameter
 243                       mm-security-handle 'gnus-details "Quit.")
 244                      nil))
 245             (mm-set-handle-multipart-parameter
 246              mm-security-handle 'gnus-info "Failed")
 247             (throw 'error handle))))
 248       (mm-set-handle-multipart-parameter
 249        mm-security-handle 'gnus-info "OK")
 250       handle)))
 251
 252 (defun mml2015-mailcrypt-clear-verify ()
 253   (let ((mc-gpg-debug-buffer (get-buffer-create " *gnus gpg debug*")))
 254     (if (condition-case err
 255             (prog1
 256                 (funcall mml2015-verify-function)
 257               (if (get-buffer " *mailcrypt stderr temp")
 258                   (mm-set-handle-multipart-parameter
 259                    mm-security-handle 'gnus-details
 260                    (with-current-buffer " *mailcrypt stderr temp"
 261                      (buffer-string))))
 262               (if (get-buffer " *mailcrypt stdout temp")
 263                   (kill-buffer " *mailcrypt stdout temp"))
 264               (if (get-buffer " *mailcrypt stderr temp")
 265                   (kill-buffer " *mailcrypt stderr temp"))
 266               (if (get-buffer " *mailcrypt status temp")
 267                   (kill-buffer " *mailcrypt status temp"))
 268               (if (get-buffer mc-gpg-debug-buffer)
 269                   (kill-buffer mc-gpg-debug-buffer)))
 270           (error
 271            (mm-set-handle-multipart-parameter
 272             mm-security-handle 'gnus-details (mml2015-format-error err))
 273            nil)
 274           (quit
 275            (mm-set-handle-multipart-parameter
 276             mm-security-handle 'gnus-details "Quit.")
 277            nil))
 278         (mm-set-handle-multipart-parameter
 279          mm-security-handle 'gnus-info "OK")
 280       (mm-set-handle-multipart-parameter
 281        mm-security-handle 'gnus-info "Failed"))))
 282
 283 (defun mml2015-mailcrypt-sign (cont)
 284   (mc-sign-generic (message-options-get 'message-sender)
 285                    nil nil nil nil)
 286   (let ((boundary (mml-compute-boundary cont))
 287         hash point)
 288     (goto-char (point-min))
 289     (unless (re-search-forward "^-----BEGIN PGP SIGNED MESSAGE-----\r?$" nil t)
 290       (error "Cannot find signed begin line"))
 291     (goto-char (match-beginning 0))
 292     (forward-line 1)
 293     (unless (looking-at "Hash:[ \t]*\\([a-zA-Z0-9]+\\)")
 294       (error "Cannot not find PGP hash"))
 295     (setq hash (match-string 1))
 296     (unless (re-search-forward "^$" nil t)
 297       (error "Cannot not find PGP message"))
 298     (forward-line 1)
 299     (delete-region (point-min) (point))
 300     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 301                     boundary))
 302     (insert (format "\tmicalg=pgp-%s; protocol=\"application/pgp-signature\"\n"
 303                     (downcase hash)))
 304     (insert (format "\n--%s\n" boundary))
 305     (setq point (point))
 306     (goto-char (point-max))
 307     (unless (re-search-backward "^-----END PGP SIGNATURE-----\r?$" nil t)
 308       (error "Cannot find signature part"))
 309     (replace-match "-----END PGP MESSAGE-----" t t)
 310     (goto-char (match-beginning 0))
 311     (unless (re-search-backward "^-----BEGIN PGP SIGNATURE-----\r?$"
 312                                 nil t)
 313       (error "Cannot find signature part"))
 314     (replace-match "-----BEGIN PGP MESSAGE-----" t t)
 315     (goto-char (match-beginning 0))
 316     (save-restriction
 317       (narrow-to-region point (point))
 318       (goto-char point)
 319       (while (re-search-forward "^- -" nil t)
 320         (replace-match "-" t t))
 321       (goto-char (point-max)))
 322     (insert (format "--%s\n" boundary))
 323     (insert "Content-Type: application/pgp-signature\n\n")
 324     (goto-char (point-max))
 325     (insert (format "--%s--\n" boundary))
 326     (goto-char (point-max))))
 327
 328 (defun mml2015-mailcrypt-encrypt (cont &optional sign)
 329   (let ((mc-pgp-always-sign
 330          (or mc-pgp-always-sign
 331              sign
 332              (eq t (or (message-options-get 'message-sign-encrypt)
 333                        (message-options-set
 334                         'message-sign-encrypt
 335                         (or (y-or-n-p "Sign the message? ")
 336                             'not))))
 337              'never)))
 338     (mm-with-unibyte-current-buffer
 339       (mc-encrypt-generic
 340        (or (message-options-get 'message-recipients)
 341            (message-options-set 'message-recipients
 342                               (mc-cleanup-recipient-headers
 343                                (read-string "Recipients: "))))
 344        nil nil nil
 345        (message-options-get 'message-sender))))
 346   (goto-char (point-min))
 347   (unless (looking-at "-----BEGIN PGP MESSAGE-----")
 348     (error "Fail to encrypt the message"))
 349   (let ((boundary (mml-compute-boundary cont)))
 350     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
 351                     boundary))
 352     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
 353     (insert (format "--%s\n" boundary))
 354     (insert "Content-Type: application/pgp-encrypted\n\n")
 355     (insert "Version: 1\n\n")
 356     (insert (format "--%s\n" boundary))
 357     (insert "Content-Type: application/octet-stream\n\n")
 358     (goto-char (point-max))
 359     (insert (format "--%s--\n" boundary))
 360     (goto-char (point-max))))
 361
 362 ;;; gpg wrapper
 363
 364 (eval-and-compile
 365   (autoload 'gpg-decrypt "gpg")
 366   (autoload 'gpg-verify "gpg")
 367   (autoload 'gpg-verify-cleartext "gpg")
 368   (autoload 'gpg-sign-detached "gpg")
 369   (autoload 'gpg-sign-encrypt "gpg")
 370   (autoload 'gpg-encrypt "gpg")
 371   (autoload 'gpg-passphrase-read "gpg"))
 372
 373 (defun mml2015-gpg-passphrase ()
 374   (or (message-options-get 'gpg-passphrase)
 375       (message-options-set 'gpg-passphrase (gpg-passphrase-read))))
 376
 377 (defun mml2015-gpg-decrypt-1 ()
 378   (let ((cipher (current-buffer)) plain result)
 379     (if (with-temp-buffer
 380           (prog1
 381               (gpg-decrypt cipher (setq plain (current-buffer))
 382                            mml2015-result-buffer nil)
 383             (mm-set-handle-multipart-parameter
 384              mm-security-handle 'gnus-details
 385              (with-current-buffer mml2015-result-buffer
 386                (buffer-string)))
 387             (set-buffer cipher)
 388             (erase-buffer)
 389             (insert-buffer-substring plain)
 390             (goto-char (point-min))
 391             (while (search-forward "\r\n" nil t)
 392               (replace-match "\n" t t))))
 393         '(t)
 394       ;; Some wrong with the return value, check plain text buffer.
 395       (if (> (point-max) (point-min))
 396           '(t)
 397         nil))))
 398
 399 (defun mml2015-gpg-decrypt (handle ctl)
 400   (let ((mml2015-decrypt-function 'mml2015-gpg-decrypt-1))
 401     (mml2015-mailcrypt-decrypt handle ctl)))
 402
 403 (defun mml2015-gpg-clear-decrypt ()
 404   (let (result)
 405     (setq result (mml2015-gpg-decrypt-1))
 406     (if (car result)
 407         (mm-set-handle-multipart-parameter
 408          mm-security-handle 'gnus-info "OK")
 409       (mm-set-handle-multipart-parameter
 410        mm-security-handle 'gnus-info "Failed"))))
 411
 412 (defun mml2015-gpg-pretty-print-fpr (fingerprint)
 413   (let* ((result "")
 414          (fpr-length (string-width fingerprint))
 415          (n-slice 0)
 416          slice)
 417     (setq fingerprint (string-to-list fingerprint))
 418     (while fingerprint
 419       (setq fpr-length (- fpr-length 4))
 420       (setq slice (butlast fingerprint fpr-length))
 421       (setq fingerprint (nthcdr 4 fingerprint))
 422       (setq n-slice (1+ n-slice))
 423       (setq result
 424             (concat
 425              result
 426              (case n-slice
 427                (1  slice)
 428                (otherwise (concat " " slice))))))
 429     result))
 430
 431 (defun mml2015-gpg-extract-signature-details ()
 432   (goto-char (point-min))
 433   (let* ((expired (re-search-forward
 434                    "^\\[GNUPG:\\] SIGEXPIRED$"
 435                    nil t))
 436          (signer (and (re-search-forward
 437                        "^\\[GNUPG:\\] GOODSIG \\([0-9A-Za-z]*\\) \\(.*\\)$"
 438                        nil t)
 439                       (cons (match-string 1) (match-string 2))))
 440          (fprint (and (re-search-forward
 441                        "^\\[GNUPG:\\] VALIDSIG \\([0-9a-zA-Z]*\\) "
 442                        nil t)
 443                       (match-string 1)))
 444          (trust  (and (re-search-forward
 445                        "^\\[GNUPG:\\] \\(TRUST_.*\\)$"
 446                        nil t)
 447                       (match-string 1)))
 448          (trust-good-enough-p
 449           (cdr (assoc trust mml2015-unabbrev-trust-alist))))
 450     (cond ((and signer fprint)
 451            (concat (cdr signer)
 452                    (unless trust-good-enough-p
 453                      (concat "\nUntrusted, Fingerprint: "
 454                              (mml2015-gpg-pretty-print-fpr fprint)))
 455                    (when expired
 456                      (format "\nWARNING: Signature from expired key (%s)"
 457                              (car signer)))))
 458           ((re-search-forward
 459             "^\\(gpg: \\)?Good signature from \"\\(.*\\)\"$" nil t)
 460            (match-string 2))
 461           (t
 462            "From unknown user"))))
 463
 464 (defun mml2015-gpg-verify (handle ctl)
 465   (catch 'error
 466     (let (part message signature info-is-set-p)
 467       (unless (setq part (mm-find-raw-part-by-type
 468                           ctl (or (mm-handle-multipart-ctl-parameter
 469                                    ctl 'protocol)
 470                                   "application/pgp-signature")
 471                           t))
 472         (mm-set-handle-multipart-parameter
 473          mm-security-handle 'gnus-info "Corrupted")
 474         (throw 'error handle))
 475       (with-temp-buffer
 476         (setq message (current-buffer))
 477         (insert part)
 478         ;; Convert <LF> to <CR><LF> in verify mode.  Sign and
 479         ;; clearsign use --textmode. The conversion is not necessary.
 480         ;; In clearverify, the conversion is not necessary either.
 481         (goto-char (point-min))
 482         (end-of-line)
 483         (while (not (eobp))
 484           (unless (eq (char-before) ?\r)
 485             (insert "\r"))
 486           (forward-line)
 487           (end-of-line))
 488         (with-temp-buffer
 489           (setq signature (current-buffer))
 490           (unless (setq part (mm-find-part-by-type
 491                               (cdr handle) "application/pgp-signature" nil t))
 492             (mm-set-handle-multipart-parameter
 493              mm-security-handle 'gnus-info "Corrupted")
 494             (throw 'error handle))
 495           (mm-insert-part part)
 496           (unless (condition-case err
 497                       (prog1
 498                           (gpg-verify message signature mml2015-result-buffer)
 499                         (mm-set-handle-multipart-parameter
 500                          mm-security-handle 'gnus-details
 501                          (with-current-buffer mml2015-result-buffer
 502                            (buffer-string))))
 503                     (error
 504                      (mm-set-handle-multipart-parameter
 505                       mm-security-handle 'gnus-details (mml2015-format-error err))
 506                      (mm-set-handle-multipart-parameter
 507                       mm-security-handle 'gnus-info "Error.")
 508                      (setq info-is-set-p t)
 509                      nil)
 510                     (quit
 511                      (mm-set-handle-multipart-parameter
 512                       mm-security-handle 'gnus-details "Quit.")
 513                      (mm-set-handle-multipart-parameter
 514                       mm-security-handle 'gnus-info "Quit.")
 515                      (setq info-is-set-p t)
 516                      nil))
 517             (unless info-is-set-p
 518               (mm-set-handle-multipart-parameter
 519                mm-security-handle 'gnus-info "Failed"))
 520             (throw 'error handle)))
 521         (mm-set-handle-multipart-parameter
 522          mm-security-handle 'gnus-info
 523          (with-current-buffer mml2015-result-buffer
 524            (mml2015-gpg-extract-signature-details))))
 525       handle)))
 526
 527 (defun mml2015-gpg-clear-verify ()
 528   (if (condition-case err
 529           (prog1
 530               (gpg-verify-cleartext (current-buffer) mml2015-result-buffer)
 531             (mm-set-handle-multipart-parameter
 532              mm-security-handle 'gnus-details
 533              (with-current-buffer mml2015-result-buffer
 534                (buffer-string))))
 535         (error
 536          (mm-set-handle-multipart-parameter
 537           mm-security-handle 'gnus-details (mml2015-format-error err))
 538          nil)
 539         (quit
 540          (mm-set-handle-multipart-parameter
 541           mm-security-handle 'gnus-details "Quit.")
 542          nil))
 543       (mm-set-handle-multipart-parameter
 544        mm-security-handle 'gnus-info
 545        (with-current-buffer mml2015-result-buffer
 546          (mml2015-gpg-extract-signature-details)))
 547     (mm-set-handle-multipart-parameter
 548      mm-security-handle 'gnus-info "Failed")))
 549
 550 (defun mml2015-gpg-sign (cont)
 551   (let ((boundary (mml-compute-boundary cont))
 552         (text (current-buffer)) signature)
 553     (goto-char (point-max))
 554     (unless (bolp)
 555       (insert "\n"))
 556     (with-temp-buffer
 557       (unless (gpg-sign-detached text (setq signature (current-buffer))
 558                                  mml2015-result-buffer
 559                                  nil
 560                                  (message-options-get 'message-sender)
 561                                  t t) ; armor & textmode
 562         (unless (> (point-max) (point-min))
 563           (pop-to-buffer mml2015-result-buffer)
 564           (error "Sign error")))
 565       (goto-char (point-min))
 566       (while (re-search-forward "\r+$" nil t)
 567         (replace-match "" t t))
 568       (set-buffer text)
 569       (goto-char (point-min))
 570       (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 571                       boundary))
 572       ;;; FIXME: what is the micalg?
 573       (insert "\tmicalg=pgp-sha1; protocol=\"application/pgp-signature\"\n")
 574       (insert (format "\n--%s\n" boundary))
 575       (goto-char (point-max))
 576       (insert (format "\n--%s\n" boundary))
 577       (insert "Content-Type: application/pgp-signature\n\n")
 578       (insert-buffer-substring signature)
 579       (goto-char (point-max))
 580       (insert (format "--%s--\n" boundary))
 581       (goto-char (point-max)))))
 582
 583 (defun mml2015-gpg-encrypt (cont &optional sign)
 584   (let ((boundary (mml-compute-boundary cont))
 585         (text (current-buffer))
 586         cipher)
 587     (mm-with-unibyte-current-buffer
 588       (with-temp-buffer
 589         ;; set up a function to call the correct gpg encrypt routine
 590         ;; with the right arguments. (FIXME: this should be done
 591         ;; differently.)
 592         (flet ((gpg-encrypt-func
 593                  (sign plaintext ciphertext result recipients &optional
 594                        passphrase sign-with-key armor textmode)
 595                  (if sign
 596                      (gpg-sign-encrypt
 597                       plaintext ciphertext result recipients passphrase
 598                       sign-with-key armor textmode)
 599                    (gpg-encrypt
 600                     plaintext ciphertext result recipients passphrase
 601                     armor textmode))))
 602           (unless (gpg-encrypt-func
 603                     sign ; passed in when using signencrypt
 604                     text (setq cipher (current-buffer))
 605                     mml2015-result-buffer
 606                     (split-string
 607                      (or
 608                       (message-options-get 'message-recipients)
 609                       (message-options-set 'message-recipients
 610                                            (read-string "Recipients: ")))
 611                      "[ \f\t\n\r\v,]+")
 612                     nil
 613                     (message-options-get 'message-sender)
 614                     t t) ; armor & textmode
 615             (unless (> (point-max) (point-min))
 616               (pop-to-buffer mml2015-result-buffer)
 617               (error "Encrypt error"))))
 618         (goto-char (point-min))
 619         (while (re-search-forward "\r+$" nil t)
 620           (replace-match "" t t))
 621         (set-buffer text)
 622         (delete-region (point-min) (point-max))
 623         (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
 624                         boundary))
 625         (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
 626         (insert (format "--%s\n" boundary))
 627         (insert "Content-Type: application/pgp-encrypted\n\n")
 628         (insert "Version: 1\n\n")
 629         (insert (format "--%s\n" boundary))
 630         (insert "Content-Type: application/octet-stream\n\n")
 631         (insert-buffer-substring cipher)
 632         (goto-char (point-max))
 633         (insert (format "--%s--\n" boundary))
 634         (goto-char (point-max))))))
 635
 636 ;;; pgg wrapper
 637
 638 (eval-when-compile
 639   (defvar pgg-default-user-id)
 640   (defvar pgg-errors-buffer)
 641   (defvar pgg-output-buffer))
 642
 643 (eval-and-compile
 644   (autoload 'pgg-decrypt-region "pgg")
 645   (autoload 'pgg-verify-region "pgg")
 646   (autoload 'pgg-sign-region "pgg")
 647   (autoload 'pgg-encrypt-region "pgg")
 648   (autoload 'pgg-parse-armor "pgg-parse"))
 649
 650 (defun mml2015-pgg-decrypt (handle ctl)
 651   (catch 'error
 652     (let ((pgg-errors-buffer mml2015-result-buffer)
 653           child handles result decrypt-status)
 654       (unless (setq child (mm-find-part-by-type
 655                            (cdr handle)
 656                            "application/octet-stream" nil t))
 657         (mm-set-handle-multipart-parameter
 658          mm-security-handle 'gnus-info "Corrupted")
 659         (throw 'error handle))
 660       (with-temp-buffer
 661         (mm-insert-part child)
 662         (if (condition-case err
 663                 (prog1
 664                     (pgg-decrypt-region (point-min) (point-max))
 665                   (setq decrypt-status
 666                         (with-current-buffer mml2015-result-buffer
 667                           (buffer-string)))
 668                   (mm-set-handle-multipart-parameter
 669                    mm-security-handle 'gnus-details
 670                    decrypt-status))
 671               (error
 672                (mm-set-handle-multipart-parameter
 673                 mm-security-handle 'gnus-details (mml2015-format-error err))
 674                nil)
 675               (quit
 676                (mm-set-handle-multipart-parameter
 677                 mm-security-handle 'gnus-details "Quit.")
 678                nil))
 679             (with-current-buffer pgg-output-buffer
 680               (goto-char (point-min))
 681               (while (search-forward "\r\n" nil t)
 682                 (replace-match "\n" t t))
 683               (setq handles (mm-dissect-buffer t))
 684               (mm-destroy-parts handle)
 685               (mm-set-handle-multipart-parameter
 686                mm-security-handle 'gnus-info "OK")
 687               (mm-set-handle-multipart-parameter
 688                mm-security-handle 'gnus-details
 689                (concat decrypt-status
 690                        (when (stringp (car handles))
 691                          "\n" (mm-handle-multipart-ctl-parameter
 692                                handles 'gnus-details))))
 693               (if (listp (car handles))
 694                   handles
 695                 (list handles)))
 696           (mm-set-handle-multipart-parameter
 697            mm-security-handle 'gnus-info "Failed")
 698           (throw 'error handle))))))
 699
 700 (defun mml2015-pgg-clear-decrypt ()
 701   (let ((pgg-errors-buffer mml2015-result-buffer))
 702     (if (prog1
 703             (pgg-decrypt-region (point-min) (point-max))
 704           (mm-set-handle-multipart-parameter
 705            mm-security-handle 'gnus-details
 706            (with-current-buffer mml2015-result-buffer
 707              (buffer-string))))
 708         (progn
 709           (erase-buffer)
 710           ;; Treat data which pgg returns as a unibyte string.
 711           (mm-disable-multibyte)
 712           (insert-buffer-substring pgg-output-buffer)
 713           (goto-char (point-min))
 714           (while (search-forward "\r\n" nil t)
 715             (replace-match "\n" t t))
 716           (mm-set-handle-multipart-parameter
 717            mm-security-handle 'gnus-info "OK"))
 718       (mm-set-handle-multipart-parameter
 719        mm-security-handle 'gnus-info "Failed"))))
 720
 721 (defun mml2015-pgg-verify (handle ctl)
 722   (let ((pgg-errors-buffer mml2015-result-buffer)
 723         signature-file part signature)
 724     (if (or (null (setq part (mm-find-raw-part-by-type
 725                               ctl (or (mm-handle-multipart-ctl-parameter
 726                                        ctl 'protocol)
 727                                       "application/pgp-signature")
 728                               t)))
 729             (null (setq signature (mm-find-part-by-type
 730                                    (cdr handle) "application/pgp-signature" nil t))))
 731         (progn
 732           (mm-set-handle-multipart-parameter
 733            mm-security-handle 'gnus-info "Corrupted")
 734           handle)
 735       (with-temp-buffer
 736         (insert part)
 737         ;; Convert <LF> to <CR><LF> in verify mode.  Sign and
 738         ;; clearsign use --textmode. The conversion is not necessary.
 739         ;; In clearverify, the conversion is not necessary either.
 740         (goto-char (point-min))
 741         (end-of-line)
 742         (while (not (eobp))
 743           (unless (eq (char-before) ?\r)
 744             (insert "\r"))
 745           (forward-line)
 746           (end-of-line))
 747         (with-temp-file (setq signature-file (mm-make-temp-file "pgg"))
 748           (mm-insert-part signature))
 749         (if (condition-case err
 750                 (prog1
 751                     (pgg-verify-region (point-min) (point-max)
 752                                        signature-file t)
 753                   (goto-char (point-min))
 754                   (while (search-forward "\r\n" nil t)
 755                     (replace-match "\n" t t))
 756                   (mm-set-handle-multipart-parameter
 757                    mm-security-handle 'gnus-details
 758                    (concat (with-current-buffer pgg-output-buffer
 759                              (buffer-string))
 760                            (with-current-buffer pgg-errors-buffer
 761                              (buffer-string)))))
 762               (error
 763                (mm-set-handle-multipart-parameter
 764                 mm-security-handle 'gnus-details (mml2015-format-error err))
 765                nil)
 766               (quit
 767                (mm-set-handle-multipart-parameter
 768                 mm-security-handle 'gnus-details "Quit.")
 769                nil))
 770             (progn
 771               (delete-file signature-file)
 772               (mm-set-handle-multipart-parameter
 773                mm-security-handle 'gnus-info
 774                (with-current-buffer pgg-errors-buffer
 775                  (mml2015-gpg-extract-signature-details))))
 776           (delete-file signature-file)
 777           (mm-set-handle-multipart-parameter
 778            mm-security-handle 'gnus-info "Failed")))))
 779   handle)
 780
 781 (defun mml2015-pgg-clear-verify ()
 782   (let ((pgg-errors-buffer mml2015-result-buffer)
 783         (text (buffer-string))
 784         (coding-system buffer-file-coding-system))
 785     (if (condition-case err
 786             (prog1
 787                 (mm-with-unibyte-buffer
 788                   (insert (mm-encode-coding-string text coding-system))
 789                   (pgg-verify-region (point-min) (point-max) nil t))
 790               (goto-char (point-min))
 791               (while (search-forward "\r\n" nil t)
 792                 (replace-match "\n" t t))
 793               (mm-set-handle-multipart-parameter
 794                mm-security-handle 'gnus-details
 795                (concat (with-current-buffer pgg-output-buffer
 796                          (buffer-string))
 797                        (with-current-buffer pgg-errors-buffer
 798                          (buffer-string)))))
 799           (error
 800            (mm-set-handle-multipart-parameter
 801             mm-security-handle 'gnus-details (mml2015-format-error err))
 802            nil)
 803           (quit
 804            (mm-set-handle-multipart-parameter
 805             mm-security-handle 'gnus-details "Quit.")
 806            nil))
 807         (mm-set-handle-multipart-parameter
 808          mm-security-handle 'gnus-info
 809          (with-current-buffer pgg-errors-buffer
 810            (mml2015-gpg-extract-signature-details)))
 811       (mm-set-handle-multipart-parameter
 812        mm-security-handle 'gnus-info "Failed"))))
 813
 814 (defun mml2015-pgg-sign (cont)
 815   (let ((pgg-errors-buffer mml2015-result-buffer)
 816         (boundary (mml-compute-boundary cont))
 817         (pgg-default-user-id (or (message-options-get 'mml-sender)
 818                                  pgg-default-user-id))
 819         (pgg-text-mode t)
 820         entry)
 821     (unless (pgg-sign-region (point-min) (point-max))
 822       (pop-to-buffer mml2015-result-buffer)
 823       (error "Sign error"))
 824     (goto-char (point-min))
 825     (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n"
 826                     boundary))
 827     (if (setq entry (assq 2 (pgg-parse-armor
 828                              (with-current-buffer pgg-output-buffer
 829                                (buffer-string)))))
 830         (setq entry (assq 'hash-algorithm (cdr entry))))
 831     (insert (format "\tmicalg=%s; "
 832                     (if (cdr entry)
 833                         (downcase (format "pgp-%s" (cdr entry)))
 834                       "pgp-sha1")))
 835     (insert "protocol=\"application/pgp-signature\"\n")
 836     (insert (format "\n--%s\n" boundary))
 837     (goto-char (point-max))
 838     (insert (format "\n--%s\n" boundary))
 839     (insert "Content-Type: application/pgp-signature\n\n")
 840     (insert-buffer-substring pgg-output-buffer)
 841     (goto-char (point-max))
 842     (insert (format "--%s--\n" boundary))
 843     (goto-char (point-max))))
 844
 845 (defun mml2015-pgg-encrypt (cont &optional sign)
 846   (let ((pgg-errors-buffer mml2015-result-buffer)
 847         (pgg-text-mode t)
 848         (boundary (mml-compute-boundary cont)))
 849     (unless (pgg-encrypt-region (point-min) (point-max)
 850                                 (split-string
 851                                  (or
 852                                   (message-options-get 'message-recipients)
 853                                   (message-options-set 'message-recipients
 854                                                        (read-string "Recipients: ")))
 855                                  "[ \f\t\n\r\v,]+")
 856                                 sign)
 857       (pop-to-buffer mml2015-result-buffer)
 858       (error "Encrypt error"))
 859     (delete-region (point-min) (point-max))
 860     (goto-char (point-min))
 861     (insert (format "Content-Type: multipart/encrypted; boundary=\"%s\";\n"
 862                     boundary))
 863     (insert "\tprotocol=\"application/pgp-encrypted\"\n\n")
 864     (insert (format "--%s\n" boundary))
 865     (insert "Content-Type: application/pgp-encrypted\n\n")
 866     (insert "Version: 1\n\n")
 867     (insert (format "--%s\n" boundary))
 868     (insert "Content-Type: application/octet-stream\n\n")
 869     (insert-buffer-substring pgg-output-buffer)
 870     (goto-char (point-max))
 871     (insert (format "--%s--\n" boundary))
 872     (goto-char (point-max))))
 873
 874 ;;; General wrapper
 875
 876 (defun mml2015-clean-buffer ()
 877   (if (gnus-buffer-live-p mml2015-result-buffer)
 878       (with-current-buffer mml2015-result-buffer
 879         (erase-buffer)
 880         t)
 881     (setq mml2015-result-buffer
 882           (gnus-get-buffer-create "*MML2015 Result*"))
 883     nil))
 884
 885 (defsubst mml2015-clear-decrypt-function ()
 886   (nth 6 (assq mml2015-use mml2015-function-alist)))
 887
 888 (defsubst mml2015-clear-verify-function ()
 889   (nth 5 (assq mml2015-use mml2015-function-alist)))
 890
 891 ;;;###autoload
 892 (defun mml2015-decrypt (handle ctl)
 893   (mml2015-clean-buffer)
 894   (let ((func (nth 4 (assq mml2015-use mml2015-function-alist))))
 895     (if func
 896         (funcall func handle ctl)
 897       handle)))
 898
 899 ;;;###autoload
 900 (defun mml2015-decrypt-test (handle ctl)
 901   mml2015-use)
 902
 903 ;;;###autoload
 904 (defun mml2015-verify (handle ctl)
 905   (mml2015-clean-buffer)
 906   (let ((func (nth 3 (assq mml2015-use mml2015-function-alist))))
 907     (if func
 908         (funcall func handle ctl)
 909       handle)))
 910
 911 ;;;###autoload
 912 (defun mml2015-verify-test (handle ctl)
 913   mml2015-use)
 914
 915 ;;;###autoload
 916 (defun mml2015-encrypt (cont &optional sign)
 917   (mml2015-clean-buffer)
 918   (let ((func (nth 2 (assq mml2015-use mml2015-function-alist))))
 919     (if func
 920         (funcall func cont sign)
 921       (error "Cannot find encrypt function"))))
 922
 923 ;;;###autoload
 924 (defun mml2015-sign (cont)
 925   (mml2015-clean-buffer)
 926   (let ((func (nth 1 (assq mml2015-use mml2015-function-alist))))
 927     (if func
 928         (funcall func cont)
 929       (error "Cannot find sign function"))))
 930
 931 ;;;###autoload
 932 (defun mml2015-self-encrypt ()
 933   (mml2015-encrypt nil))
 934
 935 (provide 'mml2015)
 936
 937 ;;; arch-tag: b04701d5-0b09-44d8-bed8-de901bf435f2
 938 ;;; mml2015.el ends here