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128 lines
4.4 KiB
EmacsLisp
128 lines
4.4 KiB
EmacsLisp
;;; tls.el --- TLS/SSL support via wrapper around GnuTLS
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;; Copyright (C) 2003 Free Software Foundation, Inc.
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;; Author: Simon Josefsson <simon@josefsson.org>
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;; Keywords: comm, tls, gnutls, ssl
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package implements a simple wrapper around "gnutls-cli" to
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;; make Emacs support TLS/SSL.
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;;
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;; Usage is the same as `open-network-stream', i.e.:
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;;
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;; (setq tmp (open-tls-stream "test" (current-buffer) "news.mozilla.org" 563))
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;; ...
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;; #<process test>
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;; (process-send-string tmp "mode reader\n")
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;; 200 secnews.netscape.com Netscape-Collabra/3.52 03615 NNRP ready ...
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;; nil
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;; (process-send-string tmp "quit\n")
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;; 205
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;; nil
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;; To use this package as a replacement for ssl.el by William M. Perry
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;; <wmperry@cs.indiana.edu>, you need to evaluate the following:
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;;
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;; (defalias 'open-ssl-stream 'open-tls-stream)
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;;; Code:
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(eval-and-compile
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(autoload 'format-spec "format-spec")
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(autoload 'format-spec-make "format-spec"))
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(defgroup tls nil
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"Transport Layer Security (TLS) parameters."
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:group 'comm)
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(defcustom tls-program '("gnutls-cli -p %p %h"
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"gnutls-cli -p %p %h --protocols ssl3")
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"List of strings containing commands to start TLS stream to a host.
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Each entry in the list is tried until a connection is successful.
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%s is replaced with server hostname, %p with port to connect to.
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The program should read input on stdin and write output to
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stdout. Also see `tls-success' for what the program should output
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after successful negotiation."
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:type '(repeat string)
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:group 'tls)
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(defcustom tls-process-connection-type nil
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"*Value for `process-connection-type' to use when starting process."
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:type 'boolean
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:group 'tls)
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(defcustom tls-success "- Handshake was completed"
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"*Regular expression indicating completed TLS handshakes.
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The default is what GNUTLS's \"gnutls-cli\" outputs."
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:type 'regexp
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:group 'tls)
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(defun open-tls-stream (name buffer host service)
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"Open a TLS connection for a service to a host.
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Returns a subprocess-object to represent the connection.
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Input and output work as for subprocesses; `delete-process' closes it.
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Args are NAME BUFFER HOST SERVICE.
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NAME is name for process. It is modified if necessary to make it unique.
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BUFFER is the buffer (or buffer-name) to associate with the process.
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Process output goes at end of that buffer, unless you specify
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an output stream or filter function to handle the output.
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BUFFER may be also nil, meaning that this process is not associated
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with any buffer
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Third arg is name of the host to connect to, or its IP address.
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Fourth arg SERVICE is name of the service desired, or an integer
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specifying a port number to connect to."
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(let ((cmds tls-program) cmd done)
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(message "Opening TLS connection to `%s'..." host)
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(while (and (not done) (setq cmd (pop cmds)))
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(message "Opening TLS connection with `%s'..." cmd)
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(let* ((process-connection-type tls-process-connection-type)
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(process (start-process
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name buffer shell-file-name shell-command-switch
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(format-spec
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cmd
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(format-spec-make
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?h host
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?p (if (integerp service)
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(int-to-string service)
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service)))))
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response)
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(while (and process
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(memq (process-status process) '(open run))
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(save-excursion
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(set-buffer buffer) ;; XXX "blue moon" nntp.el bug
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(goto-char (point-min))
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(not (setq done (re-search-forward tls-success nil t)))))
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(accept-process-output process 1)
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(sit-for 1))
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(message "Opening TLS connection with `%s'...%s" cmd
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(if done "done" "failed"))
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(if done
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(setq done process)
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(delete-process process))))
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(message "Opening TLS connection to `%s'...%s"
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host (if done "done" "failed"))
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done))
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(provide 'tls)
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;;; tls.el ends here
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