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1 | ;;; tls.el --- TLS/SSL support via wrapper around GnuTLS |
2 | ||
5fd6d89f | 3 | ;; Copyright (C) 1996, 1997, 1998, 1999, 2002, 2003, 2004, |
ceb4c4d3 | 4 | ;; 2005, 2006 Free Software Foundation, Inc. |
01b2d1dd SJ |
5 | |
6 | ;; Author: Simon Josefsson <simon@josefsson.org> | |
7 | ;; Keywords: comm, tls, gnutls, ssl | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation; either version 2, or (at your option) | |
14 | ;; any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
3a35cf56 LK |
23 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
01b2d1dd SJ |
25 | |
26 | ;;; Commentary: | |
27 | ||
28 | ;; This package implements a simple wrapper around "gnutls-cli" to | |
29 | ;; make Emacs support TLS/SSL. | |
30 | ;; | |
31 | ;; Usage is the same as `open-network-stream', i.e.: | |
32 | ;; | |
33 | ;; (setq tmp (open-tls-stream "test" (current-buffer) "news.mozilla.org" 563)) | |
34 | ;; ... | |
35 | ;; #<process test> | |
36 | ;; (process-send-string tmp "mode reader\n") | |
37 | ;; 200 secnews.netscape.com Netscape-Collabra/3.52 03615 NNRP ready ... | |
38 | ;; nil | |
39 | ;; (process-send-string tmp "quit\n") | |
40 | ;; 205 | |
41 | ;; nil | |
42 | ||
43 | ;; To use this package as a replacement for ssl.el by William M. Perry | |
44 | ;; <wmperry@cs.indiana.edu>, you need to evaluate the following: | |
45 | ;; | |
46 | ;; (defalias 'open-ssl-stream 'open-tls-stream) | |
47 | ||
48 | ;;; Code: | |
49 | ||
50 | (eval-and-compile | |
51 | (autoload 'format-spec "format-spec") | |
52 | (autoload 'format-spec-make "format-spec")) | |
53 | ||
54 | (defgroup tls nil | |
55 | "Transport Layer Security (TLS) parameters." | |
56 | :group 'comm) | |
57 | ||
58 | (defcustom tls-program '("gnutls-cli -p %p %h" | |
3031d8b0 MB |
59 | "gnutls-cli -p %p %h --protocols ssl3" |
60 | "openssl s_client -connect %h:%p -no_ssl2") | |
01b2d1dd SJ |
61 | "List of strings containing commands to start TLS stream to a host. |
62 | Each entry in the list is tried until a connection is successful. | |
63 | %s is replaced with server hostname, %p with port to connect to. | |
64 | The program should read input on stdin and write output to | |
65 | stdout. Also see `tls-success' for what the program should output | |
66 | after successful negotiation." | |
67 | :type '(repeat string) | |
3031d8b0 | 68 | :version "22.1" |
01b2d1dd SJ |
69 | :group 'tls) |
70 | ||
71 | (defcustom tls-process-connection-type nil | |
23f87bed | 72 | "*Value for `process-connection-type' to use when starting TLS process." |
bf247b6e | 73 | :version "22.1" |
01b2d1dd SJ |
74 | :type 'boolean |
75 | :group 'tls) | |
76 | ||
3031d8b0 | 77 | (defcustom tls-success "- Handshake was completed\\|SSL handshake has read " |
01b2d1dd | 78 | "*Regular expression indicating completed TLS handshakes. |
3031d8b0 MB |
79 | The default is what GNUTLS's \"gnutls-cli\" or OpenSSL's |
80 | \"openssl s_client\" outputs." | |
bf247b6e | 81 | :version "22.1" |
01b2d1dd SJ |
82 | :type 'regexp |
83 | :group 'tls) | |
84 | ||
18965008 SJ |
85 | (defcustom tls-certtool-program (executable-find "certtool") |
86 | "Name of GnuTLS certtool. | |
87 | Used by `tls-certificate-information'." | |
bf247b6e | 88 | :version "22.1" |
18965008 SJ |
89 | :type '(repeat string) |
90 | :group 'tls) | |
91 | ||
92 | (defun tls-certificate-information (der) | |
93 | "Parse X.509 certificate in DER format into an assoc list." | |
94 | (let ((certificate (concat "-----BEGIN CERTIFICATE-----\n" | |
95 | (base64-encode-string der) | |
96 | "\n-----END CERTIFICATE-----\n")) | |
97 | (exit-code 0)) | |
98 | (with-current-buffer (get-buffer-create " *certtool*") | |
99 | (erase-buffer) | |
100 | (insert certificate) | |
101 | (setq exit-code (condition-case () | |
102 | (call-process-region (point-min) (point-max) | |
103 | tls-certtool-program | |
104 | t (list (current-buffer) nil) t | |
105 | "--certificate-info") | |
106 | (error -1))) | |
107 | (if (/= exit-code 0) | |
108 | nil | |
109 | (let ((vals nil)) | |
110 | (goto-char (point-min)) | |
111 | (while (re-search-forward "^\\([^:]+\\): \\(.*\\)" nil t) | |
112 | (push (cons (match-string 1) (match-string 2)) vals)) | |
113 | (nreverse vals)))))) | |
114 | ||
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115 | (defun open-tls-stream (name buffer host port) |
116 | "Open a TLS connection for a port to a host. | |
01b2d1dd SJ |
117 | Returns a subprocess-object to represent the connection. |
118 | Input and output work as for subprocesses; `delete-process' closes it. | |
3031d8b0 | 119 | Args are NAME BUFFER HOST PORT. |
01b2d1dd SJ |
120 | NAME is name for process. It is modified if necessary to make it unique. |
121 | BUFFER is the buffer (or buffer-name) to associate with the process. | |
122 | Process output goes at end of that buffer, unless you specify | |
123 | an output stream or filter function to handle the output. | |
124 | BUFFER may be also nil, meaning that this process is not associated | |
125 | with any buffer | |
126 | Third arg is name of the host to connect to, or its IP address. | |
3031d8b0 | 127 | Fourth arg PORT is an integer specifying a port to connect to." |
01b2d1dd SJ |
128 | (let ((cmds tls-program) cmd done) |
129 | (message "Opening TLS connection to `%s'..." host) | |
130 | (while (and (not done) (setq cmd (pop cmds))) | |
131 | (message "Opening TLS connection with `%s'..." cmd) | |
132 | (let* ((process-connection-type tls-process-connection-type) | |
133 | (process (start-process | |
134 | name buffer shell-file-name shell-command-switch | |
135 | (format-spec | |
136 | cmd | |
137 | (format-spec-make | |
138 | ?h host | |
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139 | ?p (if (integerp port) |
140 | (int-to-string port) | |
141 | port))))) | |
01b2d1dd SJ |
142 | response) |
143 | (while (and process | |
144 | (memq (process-status process) '(open run)) | |
145 | (save-excursion | |
146 | (set-buffer buffer) ;; XXX "blue moon" nntp.el bug | |
147 | (goto-char (point-min)) | |
148 | (not (setq done (re-search-forward tls-success nil t))))) | |
149 | (accept-process-output process 1) | |
150 | (sit-for 1)) | |
151 | (message "Opening TLS connection with `%s'...%s" cmd | |
152 | (if done "done" "failed")) | |
153 | (if done | |
154 | (setq done process) | |
155 | (delete-process process)))) | |
156 | (message "Opening TLS connection to `%s'...%s" | |
157 | host (if done "done" "failed")) | |
158 | done)) | |
159 | ||
160 | (provide 'tls) | |
161 | ||
ab5796a9 | 162 | ;;; arch-tag: 5596d1c4-facc-4bc4-94a9-9863b928d7ac |
01b2d1dd | 163 | ;;; tls.el ends here |