X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=lisp%2Fsmime.el;fp=lisp%2Fsmime.el;h=0000000000000000000000000000000000000000;hb=b369cf058148bbe6dee0154df7bcc2a7c0cc63d0;hp=9146963a0a88f722f09a412266a36d9147c786a8;hpb=73430ac519bb1723c621b7b393a1e37c949e4c16;p=elisp%2Fgnus.git-

diff --git a/lisp/smime.el b/lisp/smime.el
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--- a/lisp/smime.el
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-;;; smime.el --- S/MIME support library
-;; Copyright (c) 2000, 2001 Free Software Foundation, Inc.
-
-;; Author: Simon Josefsson <simon@josefsson.org>
-;; Keywords: SMIME X.509 PEM OpenSSL
-
-;; This file is not a part of GNU Emacs, but the same permissions apply.
-
-;; 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:
-
-;; This library perform S/MIME operations from within Emacs.
-;;
-;; Functions for fetching certificates from public repositories are
-;; provided, currently only from DNS.  LDAP support (via EUDC) is planned.
-;;
-;; It uses OpenSSL (tested with version 0.9.5a and 0.9.6) for signing,
-;; encryption and decryption.
-;;
-;; Some general knowledge of S/MIME, X.509, PKCS#12, PEM etc is
-;; probably required to use this library in any useful way.
-;; Especially, don't expect this library to buy security for you.  If
-;; you don't understand what you are doing, you're as likely to lose
-;; security than gain any by using this library.
-;;
-;; This library is not intended to provide a "raw" API for S/MIME,
-;; PKCSx or similar, it's intended to perform common operations
-;; done on messages encoded in these formats.  The terminology chosen
-;; reflect this.
-
-;;; Quick introduction:
-
-;; Get your S/MIME certificate from VeriSign or someplace.  I used
-;; Netscape to generate the key and certificate request and stuff, and
-;; Netscape can export the key into PKCS#12 format.
-;;
-;; Enter OpenSSL.  To be able to use this library, it need to have the
-;; SMIME key readable in PEM format.  OpenSSL is used to convert the
-;; key:
-;;
-;; $ openssl pkcs12 -in mykey.p12 -clcerts -nodes > mykey.pem
-;; ...
-;;
-;; Now, use M-x customize-variable smime-keys and add mykey.pem as
-;; a key.
-;;
-;; Now you should be able to sign messages!  Create a buffer and write
-;; something and run M-x smime-sign-buffer RET RET and you should see
-;; your message MIME armoured and a signature.  Encryption, M-x
-;; smime-encrypt-buffer, should also work.
-;;
-;; To be able to verify messages you need to build up trust with
-;; someone.  Perhaps you trust the CA that issued your certificate, at
-;; least I did, so I export it's certificates from my PKCS#12
-;; certificate with:
-;;
-;; $ openssl pkcs12 -in mykey.p12 -cacerts -nodes > cacert.pem
-;; ...
-;;
-;; Now, use M-x customize-variable smime-CAs and add cacert.pem as a
-;; CA certificate.
-;;
-;; You should now be able to sign messages, and even verify messages
-;; sent by others that use the same CA as you.
-
-;; Bugs:
-;;
-;; Don't complain that this package doesn't do encrypted PEM files,
-;; submit a patch instead.  I store my keys in a safe place, so I
-;; didn't need the encryption.  Also, programming was made easier by
-;; that decision.  One might think that this even influenced were I
-;; store my keys, and one would probably be right. :-)
-;;
-;; Update: Mathias Herberts sent the patch.  However, it uses
-;; environment variables to pass the password to OpenSSL, which is
-;; slightly insecure. Hence a new todo: use a better -passin method.
-;;
-;; Cache password for e.g. 1h
-;;
-;; Suggestions and comments are appreciated, mail me at simon@josefsson.org.
-
-;; <rant>
-;;
-;; I would include pointers to introductory text on concepts used in
-;; this library here, but the material I've read are so horrible I
-;; don't want to recomend them.
-;;
-;; Why can't someone write a simple introduction to all this stuff?
-;; Until then, much of this resemble security by obscurity.
-;;
-;; Also, I'm not going to mention anything about the wonders of
-;; cryptopolitics.  Oops, I just did.
-;;
-;; </rant>
-
-;;; Revision history:
-
-;; version 0 not released
-
-;;; Code:
-
-(require 'dig)
-(require 'comint)
-(eval-when-compile (require 'cl))
-
-(defgroup smime nil
-  "S/MIME configuration.")
-
-(defcustom smime-keys nil
-  "*Map mail addresses to a file containing Certificate (and private key).
-The file is assumed to be in PEM format. You can also associate additional
-certificates to be sent with every message to each address."
-  :type '(repeat (list (string :tag "Mail address")
-		       (file :tag "File name")
-		       (repeat :tag "Additional certificate files"
-			       (file :tag "File name"))))
-  :group 'smime)
-
-(defcustom smime-CA-directory nil
-  "*Directory containing certificates for CAs you trust.
-Directory should contain files (in PEM format) named to the X.509
-hash of the certificate.  This can be done using OpenSSL such as:
-
-$ ln -s ca.pem `openssl x509 -noout -hash -in ca.pem`
-
-where `ca.pem' is the file containing a PEM encoded X.509 CA
-certificate."
-  :type '(choice (const :tag "none" nil)
-		 directory)
-  :group 'smime)
-
-(defcustom smime-CA-file nil
-  "*Files containing certificates for CAs you trust.
-File should contain certificates in PEM format."
-  :type '(choice (const :tag "none" nil)
-		 file)
-  :group 'smime)
-
-(defcustom smime-certificate-directory "~/Mail/certs/"
-  "*Directory containing other people's certificates.
-It should contain files named to the X.509 hash of the certificate,
-and the files themself should be in PEM format."
-;The S/MIME library provide simple functionality for fetching
-;certificates into this directory, so there is no need to populate it
-;manually.
-  :type 'directory
-  :group 'smime)
-
-(defcustom smime-openssl-program
-  (and (condition-case ()
-	   (eq 0 (call-process "openssl" nil nil nil "version"))
-	 (error nil))
-       "openssl")
-  "*Name of OpenSSL binary."
-  :type 'string
-  :group 'smime)
-
-;; OpenSSL option to select the encryption cipher
-
-(defcustom smime-encrypt-cipher "-des3"
-  "*Cipher algorithm used for encryption."
-  :type '(choice (const :tag "Triple DES" "-des3")
-		 (const :tag "DES"  "-des")
-		 (const :tag "RC2 40 bits" "-rc2-40")
-		 (const :tag "RC2 64 bits" "-rc2-64")
-		 (const :tag "RC2 128 bits" "-rc2-128"))
-  :group 'smime)
-
-(defcustom smime-dns-server nil
-  "*DNS server to query certificates from.
-If nil, use system defaults."
-  :type '(choice (const :tag "System defaults")
-		 string)
-  :group 'smime)
-
-(defvar smime-details-buffer "*OpenSSL output*")
-
-(eval-and-compile
-  (defalias 'smime-make-temp-file
-    (if (fboundp 'make-temp-file)
-	'make-temp-file
-      (lambda (prefix &optional dir-flag) ;; Simple implementation
-	(expand-file-name
-	 (make-temp-name prefix)
-	 temporary-file-directory)))))
-
-;; Password dialog function
-
-(defun smime-ask-passphrase ()
-  "Asks the passphrase to unlock the secret key."
-  (let ((passphrase
-	 (comint-read-noecho
-	  "Passphrase for secret key (RET for no passphrase): " t)))
-    (if (string= passphrase "")
-	nil
-      passphrase)))
-
-;; OpenSSL wrappers.
-
-(defun smime-call-openssl-region (b e buf &rest args)
-  (case (apply 'call-process-region b e smime-openssl-program nil buf nil args)
-    (0 t)
-    (1 (message "OpenSSL: An error occurred parsing the command options.") nil)
-    (2 (message "OpenSSL: One of the input files could not be read.") nil)
-    (3 (message "OpenSSL: An error occurred creating the PKCS#7 file or when reading the MIME message.") nil)
-    (4 (message "OpenSSL: An error occurred decrypting or verifying the message.") nil)
-    (t (error "Unknown OpenSSL exitcode") nil)))
-
-(defun smime-make-certfiles (certfiles)
-  (if certfiles
-      (append (list "-certfile" (expand-file-name (car certfiles)))
-	      (smime-make-certfiles (cdr certfiles)))))
-
-;; Sign+encrypt region
-
-(defun smime-sign-region (b e keyfiles)
-  "Sign region with certified key in KEYFILES.
-If signing fails, the buffer is not modified.  Region is assumed to
-have proper MIME tags.  KEYFILES is expected to contain a PEM encoded
-private key and certificate as its car, and a list of additional certificates
-to include in its caar."
-  (smime-new-details-buffer)
-  (let ((keyfile (car keyfiles))
-	(certfiles (and (cdr keyfiles) (cadr keyfiles)))
-	(buffer (generate-new-buffer (generate-new-buffer-name " *smime*")))
-	(passphrase (smime-ask-passphrase))
-	(tmpfile (smime-make-temp-file "smime")))
-    (if passphrase
-	(setenv "GNUS_SMIME_PASSPHRASE" passphrase))
-    (prog1
-	(when (prog1
-		  (apply 'smime-call-openssl-region b e (list buffer tmpfile)
-			 "smime" "-sign" "-signer" (expand-file-name keyfile)
-			 (append
-			  (smime-make-certfiles certfiles)
-			  (if passphrase
-			      (list "-passin" "env:GNUS_SMIME_PASSPHRASE"))))
-		(if passphrase
-		    (setenv "GNUS_SMIME_PASSPHRASE" "" t))
-		(with-current-buffer smime-details-buffer
-		  (insert-file-contents tmpfile)
-		  (delete-file tmpfile)))
-	  (delete-region b e)
-	  (insert-buffer-substring buffer)
-	  (goto-char b)
-	  (when (looking-at "^MIME-Version: 1.0$")
-	    (delete-region (point) (progn (forward-line 1) (point))))
-	  t)
-      (with-current-buffer smime-details-buffer
-	(goto-char (point-max))
-	(insert-buffer-substring buffer))
-      (kill-buffer buffer))))
-
-(defun smime-encrypt-region (b e certfiles)
-  "Encrypt region for recipients specified in CERTFILES.
-If encryption fails, the buffer is not modified.  Region is assumed to
-have proper MIME tags.  CERTFILES is a list of filenames, each file
-is expected to contain of a PEM encoded certificate."
-  (smime-new-details-buffer)
-  (let ((buffer (generate-new-buffer (generate-new-buffer-name " *smime*")))
-	(tmpfile (smime-make-temp-file "smime")))
-    (prog1
-	(when (prog1
-		  (apply 'smime-call-openssl-region b e (list buffer tmpfile)
-			 "smime" "-encrypt" smime-encrypt-cipher
-			 (mapcar 'expand-file-name certfiles))
-		(with-current-buffer smime-details-buffer
-		  (insert-file-contents tmpfile)
-		  (delete-file tmpfile)))
-	  (delete-region b e)
-	  (insert-buffer-substring buffer)
-	  (goto-char b)
-	  (when (looking-at "^MIME-Version: 1.0$")
-	    (delete-region (point) (progn (forward-line 1) (point))))
-	  t)
-      (with-current-buffer smime-details-buffer
-	(goto-char (point-max))
-	(insert-buffer-substring buffer))
-      (kill-buffer buffer))))
-
-;; Sign+encrypt buffer
-
-(defun smime-sign-buffer (&optional keyfile buffer)
-  "S/MIME sign BUFFER with key in KEYFILE.
-KEYFILE should contain a PEM encoded key and certificate."
-  (interactive)
-  (with-current-buffer (or buffer (current-buffer))
-    (smime-sign-region
-     (point-min) (point-max)
-     (if keyfile
-	 (list keyfile (smime-get-certfiles keyfile smime-keys))
-       (smime-get-key-by-email
-	(completing-read "Sign using which signature? " smime-keys nil nil
-			 (and (listp (car-safe smime-keys))
-			      (cdr smime-keys))))))))
-
-(defun smime-encrypt-buffer (&optional certfiles buffer)
-  "S/MIME encrypt BUFFER for recipients specified in CERTFILES.
-CERTFILES is a list of filenames, each file is expected to consist of
-a PEM encoded key and certificate.  Uses current buffer if BUFFER is
-nil."
-  (interactive)
-  (with-current-buffer (or buffer (current-buffer))
-    (smime-encrypt-region
-     (point-min) (point-max)
-     (or certfiles
-	 (list (read-file-name "Recipient's S/MIME certificate: "
-			       smime-certificate-directory nil))))))
-
-;; Verify+decrypt region
-
-(defun smime-verify-region (b e)
-  "Verify S/MIME message in region between B and E.
-Returns non-nil on success.
-Any details (stdout and stderr) are left in the buffer specified by
-`smime-details-buffer'."
-  (smime-new-details-buffer)
-  (let ((CAs (append (if smime-CA-file
-			 (list "-CAfile"
-			       (expand-file-name smime-CA-file)))
-		     (if smime-CA-directory
-			 (list "-CApath"
-			       (expand-file-name smime-CA-directory))))))
-    (unless CAs
-      (error "No CA configured"))
-    (if (apply 'smime-call-openssl-region b e (list smime-details-buffer t)
-	       "smime" "-verify" "-out" "/dev/null" CAs)
-	t
-      (insert-buffer-substring smime-details-buffer)
-      nil)))
-
-(defun smime-noverify-region (b e)
-  "Verify integrity of S/MIME message in region between B and E.
-Returns non-nil on success.
-Any details (stdout and stderr) are left in the buffer specified by
-`smime-details-buffer'."
-  (smime-new-details-buffer)
-  (if (apply 'smime-call-openssl-region b e (list smime-details-buffer t)
-	     "smime" "-verify" "-noverify" "-out" '("/dev/null"))
-      t
-    (insert-buffer-substring smime-details-buffer)
-    nil))
-
-(defun smime-decrypt-region (b e keyfile)
-  "Decrypt S/MIME message in region between B and E with key in KEYFILE.
-On success, replaces region with decrypted data and return non-nil.
-Any details (stderr on success, stdout and stderr on error) are left
-in the buffer specified by `smime-details-buffer'."
-  (smime-new-details-buffer)
-  (let ((buffer (generate-new-buffer (generate-new-buffer-name " *smime*")))
-	CAs (passphrase (smime-ask-passphrase))
-	(tmpfile (smime-make-temp-file "smime")))
-    (if passphrase
-	(setenv "GNUS_SMIME_PASSPHRASE" passphrase))
-    (if (prog1
-	    (apply 'smime-call-openssl-region b e
-		   (list buffer tmpfile)
-		   "smime" "-decrypt" "-recip" (expand-file-name keyfile)
-		   (if passphrase
-		       (list "-passin" "env:GNUS_SMIME_PASSPHRASE")))
-	  (if passphrase
-	      (setenv "GNUS_SMIME_PASSPHRASE" "" t))
-	  (with-current-buffer smime-details-buffer
-	    (insert-file-contents tmpfile)
-	    (delete-file tmpfile)))
-	(progn
-	  (delete-region b e)
-	  (insert-buffer-substring buffer)
-	  (kill-buffer buffer)
-	  t)
-      (with-current-buffer smime-details-buffer
-	(insert-buffer-substring buffer))
-      (kill-buffer buffer)
-      (delete-region b e)
-      (insert-buffer-substring smime-details-buffer)
-      nil)))
-
-;; Verify+Decrypt buffer
-
-(defun smime-verify-buffer (&optional buffer)
-  "Verify integrity of S/MIME message in BUFFER.
-Uses current buffer if BUFFER is nil. Returns non-nil on success.
-Any details (stdout and stderr) are left in the buffer specified by
-`smime-details-buffer'."
-  (interactive)
-  (with-current-buffer (or buffer (current-buffer))
-    (smime-verify-region (point-min) (point-max))))
-
-(defun smime-noverify-buffer (&optional buffer)
-  "Verify integrity of S/MIME message in BUFFER.
-Does NOT verify validity of certificate (only message integrity).
-Uses current buffer if BUFFER is nil. Returns non-nil on success.
-Any details (stdout and stderr) are left in the buffer specified by
-`smime-details-buffer'."
-  (interactive)
-  (with-current-buffer (or buffer (current-buffer))
-    (smime-noverify-region (point-min) (point-max))))
-
-(defun smime-decrypt-buffer (&optional buffer keyfile)
-  "Decrypt S/MIME message in BUFFER using KEYFILE.
-Uses current buffer if BUFFER is nil, and query user of KEYFILE if it's nil.
-On success, replaces data in buffer and return non-nil.
-Any details (stderr on success, stdout and stderr on error) are left
-in the buffer specified by `smime-details-buffer'."
-  (interactive)
-  (with-current-buffer (or buffer (current-buffer))
-    (smime-decrypt-region
-     (point-min) (point-max)
-     (expand-file-name
-      (or keyfile
-	  (smime-get-key-by-email
-	   (completing-read "Decrypt with which key? " smime-keys nil nil
-			    (and (listp (car-safe smime-keys))
-				 (caar smime-keys)))))))))
-
-;; Various operations
-
-(defun smime-new-details-buffer ()
-  (with-current-buffer (get-buffer-create smime-details-buffer)
-    (erase-buffer)))
-
-(defun smime-pkcs7-region (b e)
-  "Convert S/MIME message between points B and E into a PKCS7 message."
-  (smime-new-details-buffer)
-  (when (smime-call-openssl-region b e smime-details-buffer "smime" "-pk7out")
-    (delete-region b e)
-    (insert-buffer-substring smime-details-buffer)
-    t))
-
-(defun smime-pkcs7-certificates-region (b e)
-  "Extract any certificates enclosed in PKCS7 message between points B and E."
-  (smime-new-details-buffer)
-  (when (smime-call-openssl-region
-	 b e smime-details-buffer "pkcs7" "-print_certs" "-text")
-    (delete-region b e)
-    (insert-buffer-substring smime-details-buffer)
-    t))
-
-(defun smime-pkcs7-email-region (b e)
-  "Get email addresses contained in certificate between points B and E.
-A string or a list of strings is returned."
-  (smime-new-details-buffer)
-  (when (smime-call-openssl-region 
-	 b e smime-details-buffer "x509" "-email" "-noout")
-    (delete-region b e)
-    (insert-buffer-substring smime-details-buffer)
-    t))
-
-;; Utility functions
-
-(defun smime-get-certfiles (keyfile keys)
-  (if keys
-      (let ((curkey (car keys))
-	    (otherkeys (cdr keys)))
-	(if (string= keyfile (cadr curkey))
-	    (caddr curkey)
-	  (smime-get-certfiles keyfile otherkeys)))))
-
-(eval-and-compile
-  (defalias 'smime-point-at-eol
-    (if (fboundp 'point-at-eol)
-	'point-at-eol
-      'line-end-position)))
-
-(defun smime-buffer-as-string-region (b e)
-  "Return each line in region between B and E as a list of strings."
-  (save-excursion
-    (goto-char b)
-    (let (res)
-      (while (< (point) e)
-	(let ((str (buffer-substring (point) (smime-point-at-eol))))
-	  (unless (string= "" str)
-	    (push str res)))
-	(forward-line))
-      res)))
-
-;; Find certificates
-
-(defun smime-mail-to-domain (mailaddr)
-  (if (string-match "@" mailaddr)
-      (replace-match "." 'fixedcase 'literal mailaddr)
-    mailaddr))
-
-(defun smime-cert-by-dns (mail)
-  (let* ((dig-dns-server smime-dns-server)
-	 (digbuf (dig-invoke (smime-mail-to-domain mail) "cert" nil nil "+vc"))
-	 (retbuf (generate-new-buffer (format "*certificate for %s*" mail)))
-	 (certrr (with-current-buffer digbuf
-		   (dig-extract-rr (smime-mail-to-domain mail) "cert")))
-	 (cert (and certrr (dig-rr-get-pkix-cert certrr))))
-    (if cert
-	(with-current-buffer retbuf
-	  (insert "-----BEGIN CERTIFICATE-----\n")
-	  (let ((i 0) (len (length cert)))
-	    (while (> (- len 64) i)
-	      (insert (substring cert i (+ i 64)) "\n")
-	      (setq i (+ i 64)))
-	    (insert (substring cert i len) "\n"))
-	  (insert "-----END CERTIFICATE-----\n"))
-      (kill-buffer retbuf)
-      (setq retbuf nil))
-    (kill-buffer digbuf)
-    retbuf))
-
-;; User interface.
-
-(defvar smime-buffer "*SMIME*")
-
-(defvar smime-mode-map nil)
-(put 'smime-mode 'mode-class 'special)
-
-(unless smime-mode-map
-  (setq smime-mode-map (make-sparse-keymap))
-  (suppress-keymap smime-mode-map)
-
-  (define-key smime-mode-map "q" 'smime-exit)
-  (define-key smime-mode-map "f" 'smime-certificate-info))
-
-(defun smime-mode ()
-  "Major mode for browsing, viewing and fetching certificates.
-
-All normal editing commands are switched off.
-\\<smime-mode-map>
-
-The following commands are available:
-
-\\{smime-mode-map}"
-  (interactive)
-  (kill-all-local-variables)
-  (setq major-mode 'smime-mode)
-  (setq mode-name "SMIME")
-  (setq mode-line-process nil)
-  (use-local-map smime-mode-map)
-  (buffer-disable-undo)
-  (setq truncate-lines t)
-  (setq buffer-read-only t))
-
-(defun smime-certificate-info (certfile)
-  (interactive "fCertificate file: ")
-  (let ((buffer (get-buffer-create (format "*certificate %s*" certfile))))
-    (switch-to-buffer buffer)
-    (erase-buffer)
-    (call-process smime-openssl-program nil buffer 'display
-		  "x509" "-in" (expand-file-name certfile) "-text")
-    (fundamental-mode)
-    (set-buffer-modified-p nil)
-    (toggle-read-only t)
-    (goto-char (point-min))))
-
-(defun smime-draw-buffer ()
-  (with-current-buffer smime-buffer
-    (let (buffer-read-only)
-      (erase-buffer)
-      (insert "\nYour keys:\n")
-      (dolist (key smime-keys)
-	(insert
-	 (format "\t\t%s: %s\n" (car key) (cadr key))))
-      (insert "\nTrusted Certificate Authoritys:\n")
-      (insert "\nKnown Certificates:\n"))))
-
-(defun smime ()
-  "Go to the SMIME buffer."
-  (interactive)
-  (unless (get-buffer smime-buffer)
-    (save-excursion
-      (set-buffer (get-buffer-create smime-buffer))
-      (smime-mode)))
-  (smime-draw-buffer)
-  (switch-to-buffer smime-buffer))
-
-(defun smime-exit ()
-  "Quit the S/MIME buffer."
-  (interactive)
-  (kill-buffer (current-buffer)))
-
-;; Other functions
-
-(defun smime-get-key-by-email (email)
-  (cadr (assoc email smime-keys)))
-
-(provide 'smime)
-
-;;; smime.el ends here