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|
;;; vm-crypto.el --- Encryption and related functions for VM
;;
;; This file is part of VM
;;
;; Copyright (C) 2001 Kyle E. Jones
;; Copyright (C) 2003-2006 Robert Widhopf-Fenk
;;
;; This program 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 of the License, or
;; (at your option) any later version.
;;
;; This program 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 this program; if not, write to the Free Software Foundation, Inc.,
;; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
;;; Code:
(provide 'vm-crypto)
(eval-when-compile
(require 'vm-misc)
(require 'vm-folder)
)
;; compatibility
(fset 'vm-pop-md5 'vm-md5-string)
;;;###autoload
(defun vm-md5-region (start end)
(if (fboundp 'md5)
(md5 (current-buffer) start end)
(let ((buffer nil)
(retval nil)
(curbuf (current-buffer)))
(unwind-protect
(save-excursion
(setq buffer (vm-make-work-buffer))
(set-buffer buffer)
(insert-buffer-substring curbuf start end)
;; call-process-region calls write-region.
;; don't let it do CR -> LF translation.
(setq selective-display nil)
(setq retval
(call-process-region (point-min) (point-max)
vm-pop-md5-program
t buffer nil))
(if (not (equal retval 0))
(progn
(error "%s failed: exited with code %s"
vm-pop-md5-program retval)))
;; md5sum generates extra output even when summing stdin.
(goto-char (point-min))
(if (re-search-forward " [ *]?-\n" nil t)
(replace-match ""))
(goto-char (point-min))
(if (or (re-search-forward "[^0-9a-f\n]" nil t)
(< (point-max) 32))
(error "%s produced bogus MD5 digest '%s'"
vm-pop-md5-program
(vm-buffer-substring-no-properties (point-min)
(point-max))))
;; MD5 digest is 32 chars long
;; mddriver adds a newline to make neaten output for tty
;; viewing, make sure we leave it behind.
(vm-buffer-substring-no-properties (point-min) (+ (point-min) 32)))
(and buffer (kill-buffer buffer))))))
;; output is in hex
;;;###autoload
(defun vm-md5-string (string)
(if (fboundp 'md5)
(md5 string)
(vm-with-string-as-temp-buffer
string (function
(lambda ()
(goto-char (point-min))
(insert (vm-md5-region (point-min) (point-max)))
(delete-region (point) (point-max)))))))
;; output is the raw digest bits, not hex
;;;###autoload
(defun vm-md5-raw-string (s)
(setq s (vm-md5-string s))
(let ((raw (make-string 16 0))
(i 0) n
(hex-digit-alist '((?0 . 0) (?1 . 1) (?2 . 2) (?3 . 3)
(?4 . 4) (?5 . 5) (?6 . 6) (?7 . 7)
(?8 . 8) (?9 . 9) (?A . 10) (?B . 11)
(?C . 12) (?D . 13) (?E . 14) (?F . 15)
;; some mailer uses lower-case hex
;; digits despite this being forbidden
;; by the MIME spec.
(?a . 10) (?b . 11) (?c . 12) (?d . 13)
(?e . 14) (?f . 15))))
(while (< i 32)
(setq n (+ (* (cdr (assoc (aref s i) hex-digit-alist)) 16)
(cdr (assoc (aref s (1+ i)) hex-digit-alist))))
(aset raw (/ i 2) n)
(setq i (+ i 2)))
raw ))
;;;###autoload
(defun vm-xor-string (s1 s2)
(let ((len (length s1))
result (i 0))
(if (/= len (length s2))
(error "strings not of equal length"))
(setq result (make-string len 0))
(while (< i len)
(aset result i (logxor (aref s1 i) (aref s2 i)))
(setq i (1+ i)))
result ))
;;;###autoload
(defun vm-setup-ssh-tunnel (host port)
(let (local-port process done)
(while (not done)
(setq local-port (+ 1025 (random (- 65536 1025)))
process nil)
(condition-case nil
(progn
(setq process
(open-network-stream "TEST-CONNECTION" nil
"127.0.0.1" local-port))
(vm-process-kill-without-query process))
(error nil))
(cond ((null process)
(setq process
(apply 'start-process
(format "SSH tunnel to %s:%s" host port)
(vm-make-work-buffer)
vm-ssh-program
(nconc
(list "-L"
(format "%d:%s:%s" local-port host port))
(copy-sequence vm-ssh-program-switches)
(list host vm-ssh-remote-command)))
done t)
(vm-process-kill-without-query process)
(set-process-sentinel process 'vm-process-sentinel-kill-buffer))
(t
(delete-process process))))
;; wait for some output from vm-ssh-remote-command. this
;; ensures that when we return the ssh connection is ready to
;; do port-forwarding.
(accept-process-output process)
local-port ))
(defun vm-generate-random-data-file (n-octets)
(let ((file (vm-make-tempfile))
work-buffer (i n-octets))
(unwind-protect
(save-excursion
(setq work-buffer (vm-make-work-buffer))
(set-buffer work-buffer)
(while (> i 0)
(insert-char (random 256) 1)
(setq i (1- i)))
(write-region (point-min) (point-max) file nil 0))
(and work-buffer (kill-buffer work-buffer)))
file ))
;;;###autoload
(defun vm-setup-stunnel-random-data-if-needed ()
(cond ((null vm-stunnel-random-data-method) nil)
((eq vm-stunnel-random-data-method 'generate)
(if (and (stringp vm-stunnel-random-data-file)
(file-readable-p vm-stunnel-random-data-file))
nil
(setq vm-stunnel-random-data-file
(vm-generate-random-data-file (* 4 1024)))))))
;;;###autoload
(defun vm-tear-down-stunnel-random-data ()
(if (stringp vm-stunnel-random-data-file)
(vm-error-free-call 'delete-file vm-stunnel-random-data-file))
(setq vm-stunnel-random-data-file nil))
(defun vm-stunnel-random-data-args ()
(cond ((null vm-stunnel-random-data-method) nil)
((eq vm-stunnel-random-data-method 'generate)
(list "-R" vm-stunnel-random-data-file))
(t nil)))
;;;###autoload
(defun vm-stunnel-configuration-args (host port)
(if (eq vm-stunnel-wants-configuration-file 'unknown)
(setq vm-stunnel-wants-configuration-file
(not (eq (call-process vm-stunnel-program nil nil nil "-h") 0))))
(if (not vm-stunnel-wants-configuration-file)
(nconc (vm-stunnel-random-data-args)
(list "-W" "-c" "-r"
(format "%s:%s" host port)))
(let ((work-buffer nil)
(workfile (vm-stunnel-configuration-file)))
(unwind-protect
(save-excursion
(setq work-buffer (vm-make-work-buffer))
(set-buffer work-buffer)
(if (and vm-stunnel-program-additional-configuration-file
(stringp vm-stunnel-program-additional-configuration-file)
(file-readable-p
vm-stunnel-program-additional-configuration-file))
(insert-file-contents
vm-stunnel-program-additional-configuration-file))
(insert "client = yes\n")
(insert "RNDfile = " vm-stunnel-random-data-file "\n")
(insert "RNDoverwrite = no\n")
(insert "connect = " (format "%s:%s" host port) "\n")
(write-region (point-min) (point-max) workfile nil 0))
(and work-buffer (kill-buffer work-buffer)))
(list workfile) )))
(defun vm-stunnel-configuration-file ()
(if vm-stunnel-configuration-file
vm-stunnel-configuration-file
(setq vm-stunnel-configuration-file (vm-make-tempfile))
(vm-register-global-garbage-files (list vm-stunnel-configuration-file))
vm-stunnel-configuration-file))
;;; vm-crypto.el ends here
|
