* gssapi.el (open-gssapi-stream): Remove the last mentions of the IMAP stuff.
[gnus] / lisp / gssapi.el
1 ;;; gssapi.el --- GSSAPI/Kerberos 5 interface for Emacs
2
3 ;; Copyright (C) 2011 Free Software Foundation, Inc.
4
5 ;; Author: Simon Josefsson <simon@josefsson.org>
6 ;;         Lars Magne Ingebrigtsen <larsi@gnus.org>
7 ;; Keywords: network
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 3 of the License, or
14 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
23
24 ;;; Commentary:
25
26 ;;; Code:
27
28 (require 'format-spec)
29
30 (defcustom gssapi-program (list
31                            (concat "gsasl %s %p "
32                                    "--mechanism GSSAPI "
33                                    "--authentication-id %l")
34                            "imtest -m gssapi -u %l -p %p %s")
35   "List of strings containing commands for GSSAPI (krb5) authentication.
36 %s is replaced with server hostname, %p with port to connect to,
37 and %l with the user name.  The program should accept commands on
38 stdin and return responses to stdout.  Each entry in the list is
39 tried until a successful connection is made."
40   :group 'network
41   :type '(repeat string))
42
43 (defun open-gssapi-stream (name buffer server port user)
44   (let ((cmds gssapi-program)
45         cmd done)
46     (with-current-buffer buffer
47       (while (and (not done)
48                   (setq cmd (pop cmds)))
49         (message "Opening GSSAPI connection with `%s'..." cmd)
50         (erase-buffer)
51         (let* ((coding-system-for-read 'binary)
52                (coding-system-for-write 'binary)
53                (process (start-process
54                          name buffer shell-file-name shell-command-switch
55                          (format-spec
56                           cmd
57                           (format-spec-make
58                            ?s server
59                            ?p (number-to-string port)
60                            ?l user))))
61                response)
62           (when process
63             (while (and (memq (process-status process) '(open run))
64                         (goto-char (point-min))
65                         ;; Athena IMTEST can output SSL verify errors
66                         (or (while (looking-at "^verify error:num=")
67                               (forward-line))
68                             t)
69                         (or (while (looking-at "^TLS connection established")
70                               (forward-line))
71                             t)
72                         ;; cyrus 1.6.x (13? < x <= 22) queries capabilities
73                         (or (while (looking-at "^C:")
74                               (forward-line))
75                             t)
76                         ;; cyrus 1.6 imtest print "S: " before server greeting
77                         (or (not (looking-at "S: "))
78                             (forward-char 3)
79                             t)
80                         ;; GNU SASL may print 'Trying ...' first.
81                         (or (not (looking-at "Trying "))
82                             (forward-line)
83                             t)
84                         (not (and (looking-at "\\* \\(OK\\|PREAUTH\\|BYE\\) ")
85                                   ;; success in imtest 1.6:
86                                   (re-search-forward
87                                    (concat "^\\(\\(Authenticat.*\\)\\|\\("
88                                            "Client authentication "
89                                            "finished.*\\)\\)")
90                                    nil t)
91                                   (setq response (match-string 1)))))
92               (accept-process-output process 1)
93               (sit-for 1))
94             (erase-buffer)
95             (message "GSSAPI connection: %s" (or response "failed"))
96             (if (and response (let ((case-fold-search nil))
97                                 (not (string-match "failed" response))))
98                 (setq done process)
99               (delete-process process)
100               nil))))
101       done)))
102
103 (provide 'gssapi)
104
105 ;;; gssapi.el ends here