--- /dev/null
+;;; mml-smime.el --- S/MIME support for MML
+;; Copyright (c) 2000, 2001, 2003, 2005 Free Software Foundation, Inc.
+
+;; Author: Simon Josefsson <simon@josefsson.org>
+;; Keywords: Gnus, MIME, S/MIME, MML
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published
+;; by the Free Software Foundation; either version 2, or (at your
+;; option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+;; EMIKO doesn't provide the smime.el module.
+(condition-case nil
+ (require 'smime)
+ (error))
+(require 'mm-decode)
+(autoload 'message-narrow-to-headers "message")
+(autoload 'message-fetch-field "message")
+
+(defun mml-smime-sign (cont)
+ (when (null smime-keys)
+ (customize-variable 'smime-keys)
+ (error "No S/MIME keys configured, use customize to add your key"))
+ (smime-sign-buffer (cdr (assq 'keyfile cont)))
+ (goto-char (point-min))
+ (while (search-forward "\r\n" nil t)
+ (replace-match "\n" t t))
+ (goto-char (point-max)))
+
+(defun mml-smime-encrypt (cont)
+ (let (certnames certfiles tmp file tmpfiles)
+ ;; xxx tmp files are always an security issue
+ (while (setq tmp (pop cont))
+ (if (and (consp tmp) (eq (car tmp) 'certfile))
+ (push (cdr tmp) certnames)))
+ (while (setq tmp (pop certnames))
+ (if (not (and (not (file-exists-p tmp))
+ (get-buffer tmp)))
+ (push tmp certfiles)
+ (setq file (mm-make-temp-file (expand-file-name "mml."
+ mm-tmp-directory)))
+ (with-current-buffer tmp
+ (write-region (point-min) (point-max) file))
+ (push file certfiles)
+ (push file tmpfiles)))
+ (if (smime-encrypt-buffer certfiles)
+ (progn
+ (while (setq tmp (pop tmpfiles))
+ (delete-file tmp))
+ t)
+ (while (setq tmp (pop tmpfiles))
+ (delete-file tmp))
+ nil))
+ (goto-char (point-max)))
+
+(defun mml-smime-sign-query ()
+ ;; query information (what certificate) from user when MML tag is
+ ;; added, for use later by the signing process
+ (when (null smime-keys)
+ (customize-variable 'smime-keys)
+ (error "No S/MIME keys configured, use customize to add your key"))
+ (list 'keyfile
+ (if (= (length smime-keys) 1)
+ (cadar smime-keys)
+ (or (let ((from (cadr (funcall gnus-extract-address-components
+ (or (save-excursion
+ (save-restriction
+ (message-narrow-to-headers)
+ (message-fetch-field "from")))
+ "")))))
+ (and from (smime-get-key-by-email from)))
+ (smime-get-key-by-email
+ (completing-read "Sign this part with what signature? "
+ smime-keys nil nil
+ (and (listp (car-safe smime-keys))
+ (caar smime-keys))))))))
+
+(defun mml-smime-get-file-cert ()
+ (ignore-errors
+ (list 'certfile (read-file-name
+ "File with recipient's S/MIME certificate: "
+ smime-certificate-directory nil t ""))))
+
+(defun mml-smime-get-dns-cert ()
+ ;; todo: deal with comma separated multiple recipients
+ (let (result who bad cert)
+ (condition-case ()
+ (while (not result)
+ (setq who (read-from-minibuffer
+ (format "%sLookup certificate for: " (or bad ""))
+ (cadr (funcall gnus-extract-address-components
+ (or (save-excursion
+ (save-restriction
+ (message-narrow-to-headers)
+ (message-fetch-field "to")))
+ "")))))
+ (if (setq cert (smime-cert-by-dns who))
+ (setq result (list 'certfile (buffer-name cert)))
+ (setq bad (format "`%s' not found. " who))))
+ (quit))
+ result))
+
+(defun mml-smime-get-ldap-cert ()
+ ;; todo: deal with comma separated multiple recipients
+ (let (result who bad cert)
+ (condition-case ()
+ (while (not result)
+ (setq who (read-from-minibuffer
+ (format "%sLookup certificate for: " (or bad ""))
+ (cadr (funcall gnus-extract-address-components
+ (or (save-excursion
+ (save-restriction
+ (message-narrow-to-headers)
+ (message-fetch-field "to")))
+ "")))))
+ (if (setq cert (smime-cert-by-ldap who))
+ (setq result (list 'certfile (buffer-name cert)))
+ (setq bad (format "`%s' not found. " who))))
+ (quit))
+ result))
+
+(defun mml-smime-encrypt-query ()
+ ;; todo: add ldap support (xemacs ldap api?)
+ ;; todo: try dns/ldap automatically first, before prompting user
+ (let (certs done)
+ (while (not done)
+ (ecase (read (gnus-completing-read-with-default
+ "ldap" "Fetch certificate from"
+ '(("dns") ("ldap") ("file")) nil t))
+ (dns (setq certs (append certs
+ (mml-smime-get-dns-cert))))
+ (ldap (setq certs (append certs
+ (mml-smime-get-ldap-cert))))
+ (file (setq certs (append certs
+ (mml-smime-get-file-cert)))))
+ (setq done (not (y-or-n-p "Add more recipients? "))))
+ certs))
+
+(defun mml-smime-verify (handle ctl)
+ (with-temp-buffer
+ (insert-buffer-substring (mm-handle-multipart-original-buffer ctl))
+ (goto-char (point-min))
+ (insert (format "Content-Type: %s; " (mm-handle-media-type ctl)))
+ (insert (format "protocol=\"%s\"; "
+ (mm-handle-multipart-ctl-parameter ctl 'protocol)))
+ (insert (format "micalg=\"%s\"; "
+ (mm-handle-multipart-ctl-parameter ctl 'micalg)))
+ (insert (format "boundary=\"%s\"\n\n"
+ (mm-handle-multipart-ctl-parameter ctl 'boundary)))
+ (when (get-buffer smime-details-buffer)
+ (kill-buffer smime-details-buffer))
+ (let ((buf (current-buffer))
+ (good-signature (smime-noverify-buffer))
+ (good-certificate (and (or smime-CA-file smime-CA-directory)
+ (smime-verify-buffer)))
+ addresses openssl-output)
+ (setq openssl-output (with-current-buffer smime-details-buffer
+ (buffer-string)))
+ (if (not good-signature)
+ (progn
+ ;; we couldn't verify message, fail with openssl output as message
+ (mm-set-handle-multipart-parameter
+ mm-security-handle 'gnus-info "Failed")
+ (mm-set-handle-multipart-parameter
+ mm-security-handle 'gnus-details
+ (concat "OpenSSL failed to verify message integrity:\n"
+ "-------------------------------------------\n"
+ openssl-output)))
+ ;; verify mail addresses in mail against those in certificate
+ (when (and (smime-pkcs7-region (point-min) (point-max))
+ (smime-pkcs7-certificates-region (point-min) (point-max)))
+ (with-temp-buffer
+ (insert-buffer-substring buf)
+ (goto-char (point-min))
+ (while (re-search-forward "-----END CERTIFICATE-----" nil t)
+ (when (smime-pkcs7-email-region (point-min) (point))
+ (setq addresses (append (smime-buffer-as-string-region
+ (point-min) (point)) addresses)))
+ (delete-region (point-min) (point)))
+ (setq addresses (mapcar 'downcase addresses))))
+ (if (not (member (downcase (or (mm-handle-multipart-from ctl) "")) addresses))
+ (mm-set-handle-multipart-parameter
+ mm-security-handle 'gnus-info "Sender address forged")
+ (if good-certificate
+ (mm-set-handle-multipart-parameter
+ mm-security-handle 'gnus-info "Ok (sender authenticated)")
+ (mm-set-handle-multipart-parameter
+ mm-security-handle 'gnus-info "Ok (sender not trusted)")))
+ (mm-set-handle-multipart-parameter
+ mm-security-handle 'gnus-details
+ (concat "Sender claimed to be: " (mm-handle-multipart-from ctl) "\n"
+ (if addresses
+ (concat "Addresses in certificate: "
+ (mapconcat 'identity addresses ", "))
+ "No addresses found in certificate. (Requires OpenSSL 0.9.6 or later.)")
+ "\n" "\n"
+ "OpenSSL output:\n"
+ "---------------\n" openssl-output "\n"
+ "Certificate(s) inside S/MIME signature:\n"
+ "---------------------------------------\n"
+ (buffer-string) "\n")))))
+ handle)
+
+(defun mml-smime-verify-test (handle ctl)
+ smime-openssl-program)
+
+(provide 'mml-smime)
+
+;;; mml-smime.el ends here
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