/usr/share/emacs/site-lisp/mew/mew-ssl.el is in mew-beta 7.0.50~6.5+0.20140128-1.
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;; Author: Kazu Yamamoto <Kazu@Mew.org>
;; Created: Jul 25, 2002
;;; Code:
(require 'mew)
(defvar mew-prog-ssl "stunnel")
(defvar mew-ssl-cert-directory "~/.certs"
"The directory where certificates of root servers are stored.
A file name of a certificate should be 'cert-hash.0'.
'cert-hash' can be extracted by 'openssl x509 -hash -noout -in cert.pem'.")
(defvar mew-ssl-verify-level 1
"Verification level of server's certificate.
0 - no verification.
1 - verify server's certificate if present. If verification failed, an
SSL/TLS connection is not created. If not present, an SSL/TLS connection
is created.
2 - verify server's certificate. If verification failed, an SSL/TLS
connection is not created. If not present, an SSL/TLS connection is
not created.
3 - verify server's certificate which locally installed (not one from
the server).")
(defvar mew-prog-ssl-arg nil
"For stunnel v3, a list of command-line arguments, each one a string.
For stunnel v4, a string of extra text to place in the configuration file,
which should end with a newline (example: \"fips=no\\n\"); or nil to insert
no extra text.")
(defvar mew-ssl-ver nil)
(defvar mew-ssl-minor-ver nil)
(defvar mew-ssl-libwrap nil)
(defconst mew-ssl-process-exec-cnt 3)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Magic words
;;;
(defconst mew-tls-smtp "smtp")
(defconst mew-tls-pop "pop3")
(defconst mew-tls-nntp "nntp")
(defconst mew-tls-imap "imap") ;; xxx stunnel does not support this.
;; stunnel does not support IPv6, sigh
(defconst mew-ssl-localhost "127.0.0.1")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; SSL/TLS info
;;;
(defvar mew-ssl-info-list '("status" "try" "file" "string"))
(mew-info-defun "mew-ssl-" mew-ssl-info-list)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Process name
;;;
(defconst mew-ssl-info-prefix "mew-ssl-info-")
(defun mew-ssl-info-name (server remoteport localport)
(format "%s:%s:%d:%d" mew-ssl-info-prefix server remoteport localport))
(defun mew-ssl-info-name-regex (server remoteport)
(format "^%s:%s:%d" mew-ssl-info-prefix server remoteport))
(defun mew-ssl-pnm-to-lport (pnm)
(if (string-match ":\\([0-9]+\\)$" pnm) (match-string 1 pnm)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Executing SSL/TLS
;;;
(defun mew-ssl-server (server)
(if (string= server "localhost")
mew-ssl-localhost
server))
(defun mew-ssl-options (case server remoteport localport tls)
(setq server (mew-ssl-server server))
(if (= mew-ssl-ver 3)
(let (args)
(setq args
`("-c" "-f"
"-a" ,(expand-file-name (mew-ssl-cert-directory case))
"-d" ,(format "%s:%d" mew-ssl-localhost localport)
"-v" ,(number-to-string (mew-ssl-verify-level case))
"-D" "debug"
"-P" ""
"-r" ,(format "%s:%d" server remoteport)
,@mew-prog-ssl-arg))
(if tls (setq args (cons "-n" (cons tls args))))
args)
(let ((file (mew-make-temp-name)))
(with-temp-buffer
(insert "client=yes\n")
(insert "pid=\n")
(insert (format "verify=%d\n" (mew-ssl-verify-level case)))
(insert "foreground=yes\n")
(insert "debug=debug\n")
(if (and mew-ssl-libwrap (>= mew-ssl-minor-ver 45))
(insert "libwrap=no\n"))
(if (>= mew-ssl-minor-ver 22)
(insert "syslog=no\n"))
(insert "CApath=" (expand-file-name (mew-ssl-cert-directory case)) "\n")
(if mew-prog-ssl-arg
(insert mew-prog-ssl-arg))
(insert (format "[%d]\n" localport))
(insert (format "accept=%s:%d\n" mew-ssl-localhost localport))
(insert (format "connect=%s:%d\n" server remoteport))
(if tls (insert (format "protocol=%s\nsslVersion=TLSv1\n" tls)))
(mew-frwlet mew-cs-dummy mew-cs-text-for-write
;; NEVER use call-process-region for privacy reasons
(write-region (point-min) (point-max) file nil 'no-msg))
(list file)))))
(defun mew-open-ssl-stream (case server serv tls)
"Open an SSL/TLS stream for SERVER's SERV.
This function returns a process when an SSL/TLS connection is created
successfully.
If TLS is nil, an SSL connection is created.
If TLS is a magic word for 'stunnel', a TLS connection is created.
A local port number can be obtained the process name after ':'. "
(cond
((or (null mew-ssl-ver) (not (mew-which-exec mew-prog-ssl)))
(message "'%s' is not found" mew-prog-ssl)
nil)
(t
(let* ((remoteport (mew-serv-to-port serv))
(localport (+ 8000 (% (mew-random) 4000)))
(process-connection-type mew-connection-type2)
(N mew-ssl-process-exec-cnt)
(pros (process-list))
(regex (mew-ssl-info-name-regex server remoteport))
name pnm pro dummy bound opts)
(catch 'find
(dolist (pr pros)
(when (string-match regex (process-name pr))
(if (memq (process-status pr) '(run))
(setq pro pr)
(delete-process pr))
(throw 'find nil))))
(if pro
pro
(message "Creating an SSL/TLS connection...")
(setq pro nil)
(catch 'loop
(dotimes (i N)
(setq name (mew-ssl-info-name server remoteport localport))
(setq opts (mew-ssl-options case server remoteport localport tls))
(setq pro (apply 'start-process name nil mew-prog-ssl opts))
;; An error would occur. So, let's exit in the case.
(cond
((not (processp pro))
(message "Creating an SSL/TLS connection...FAILED")
(throw 'loop nil))
((not (memq (process-status pro) '(run)))
(delete-process pro)
(message "Creating an SSL/TLS connection...FAILED")
(throw 'loop nil)))
;; stunnel is now running.
(mew-process-silent-exit pro)
(setq pnm (process-name pro))
(mew-info-clean-up pnm)
(mew-ssl-set-try pnm 0)
(if (= mew-ssl-ver 4) (mew-ssl-set-file pnm (car opts)))
(mew-set-process-cs pro mew-cs-text-for-read mew-cs-text-for-write)
(set-process-filter pro 'mew-ssl-filter1)
(set-process-sentinel pro 'mew-ssl-sentinel)
(mew-rendezvous (null (mew-ssl-get-status pnm)))
(if (eq (mew-ssl-get-status pnm) t)
(throw 'loop (setq bound t)))
;; bind-failure
(setq localport (1+ localport))))
(mew-ssl-set-status pnm nil)
(if (not bound)
(progn
(message "Creating an SSL/TLS connection...FAILED")
nil)
;; "stunnel" does not gain access to the remote port
;; until a tunneled connection is created.
;; So, we need to check the SSL/TLS tunnel with a dummy
;; tunneled connection here.
(set-process-filter pro 'mew-ssl-filter2)
(setq dummy (open-network-stream " *Mew dummy*" nil mew-ssl-localhost localport))
(mew-rendezvous (null (mew-ssl-get-status pnm)))
(if (processp dummy) (delete-process dummy))
(if (eq (mew-ssl-get-status pnm) t)
(progn
(message "Creating an SSL/TLS connection...done")
(set-process-filter pro 'mew-ssl-filter3)
pro)
;; verify-failure
(delete-process pro)
(message "Creating an SSL/TLS connection...FAILED (cert verify failure)")
nil)))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Filter and sentinel
;;;
(defun mew-ssl-debug (label string)
(when (mew-debug 'net)
(with-current-buffer (get-buffer-create mew-buffer-debug)
(goto-char (point-max))
(insert (format "\n<%s>\n%s\n" label string)))))
(defun mew-ssl-filter1 (process string)
(let* ((pnm (process-name process))
(prev-str (mew-ssl-get-string pnm)))
(save-excursion
(mew-ssl-debug "SSL/TLS: " string)
(mew-ssl-set-string pnm string)
(setq string (concat prev-str string))
(cond
((string-match "bound \\(\\|FD=[0-9]+ \\)to" string)
(mew-ssl-set-status pnm t))
((string-match "gethostbyname: Valid name, no data record of requested type" string)
(mew-ssl-set-status pnm 'gethostbyname-failure))
((string-match "gethostbyname: Host not found" string)
(mew-ssl-set-status pnm 'gethostbyname-failure))
((string-match "Local: bind: Address already in use" string)
(mew-ssl-set-status pnm 'bind-failure))))))
(defun mew-ssl-filter2 (process string)
(let* ((pnm (process-name process))
(prev-str (mew-ssl-get-string pnm)))
(save-excursion
(mew-ssl-debug "SSL/TLS: " string)
(mew-ssl-set-string pnm string)
(setq string (concat prev-str string))
(cond
((string-match "Negotiated \\|opened with SSL" string)
(mew-ssl-set-status pnm t))
((string-match "Failed to initialize" string)
(mew-ssl-set-status pnm t)) ;; xxx
((string-match "verify failed" string)
(mew-ssl-set-status pnm 'verify-failure))))))
(defun mew-ssl-filter3 (process string)
(save-excursion
(mew-ssl-debug "SSL/TLS: " string)))
(defun mew-ssl-sentinel (process event)
(let* ((pnm (process-name process))
(file (mew-ssl-get-file pnm)))
(save-excursion
(mew-delete-file file))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; stunnel version check
;;;
(defun mew-ssl-setup ()
(if (not (mew-which-exec mew-prog-ssl))
(setq mew-ssl-ver nil)
(with-temp-buffer
(call-process mew-prog-ssl nil t nil "-version")
(goto-char (point-min))
(re-search-forward "^stunnel " nil t 1)
(if (looking-at "4\\.\\([0-9]+\\)")
(progn
(setq mew-ssl-ver 4)
(setq mew-ssl-minor-ver (string-to-number (mew-match-string 1))))
(setq mew-ssl-ver 3))
(when (re-search-forward "LIBWRAP" nil t)
(setq mew-ssl-libwrap t)))))
(provide 'mew-ssl)
;;; Copyright Notice:
;; Copyright (C) 2002-2012 Mew developing team.
;; All rights reserved.
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions
;; are met:
;;
;; 1. Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;; 2. Redistributions in binary form must reproduce the above copyright
;; notice, this list of conditions and the following disclaimer in the
;; documentation and/or other materials provided with the distribution.
;; 3. Neither the name of the team nor the names of its contributors
;; may be used to endorse or promote products derived from this software
;; without specific prior written permission.
;;
;; THIS SOFTWARE IS PROVIDED BY THE TEAM AND CONTRIBUTORS ``AS IS'' AND
;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
;; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE TEAM OR CONTRIBUTORS BE
;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
;; BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
;; OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
;; IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;; mew-ssl.el ends here
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