Remove nnml-retrieve-groups that is unnecessary and somewhat problematic
[gnus] / lisp / gssapi.el
1 ;;; gssapi.el --- GSSAPI/Kerberos 5 interface for Emacs
2
3 ;; Copyright (C) 2011-2015 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   :version "24.1"
41   :group 'network
42   :type '(repeat string))
43
44 (defun open-gssapi-stream (name buffer server port user)
45   (let ((cmds gssapi-program)
46         cmd done)
47     (with-current-buffer buffer
48       (while (and (not done)
49                   (setq cmd (pop cmds)))
50         (message "Opening GSSAPI connection with `%s'..." cmd)
51         (erase-buffer)
52         (let* ((coding-system-for-read 'binary)
53                (coding-system-for-write 'binary)
54                (process (start-process
55                          name buffer shell-file-name shell-command-switch
56                          (format-spec
57                           cmd
58                           (format-spec-make
59                            ?s server
60                            ?p (number-to-string port)
61                            ?l user))))
62                response)
63           (when process
64             (while (and (memq (process-status process) '(open run))
65                         (goto-char (point-min))
66                         ;; Athena IMTEST can output SSL verify errors
67                         (or (while (looking-at "^verify error:num=")
68                               (forward-line))
69                             t)
70                         (or (while (looking-at "^TLS connection established")
71                               (forward-line))
72                             t)
73                         ;; cyrus 1.6.x (13? < x <= 22) queries capabilities
74                         (or (while (looking-at "^C:")
75                               (forward-line))
76                             t)
77                         ;; cyrus 1.6 imtest print "S: " before server greeting
78                         (or (not (looking-at "S: "))
79                             (forward-char 3)
80                             t)
81                         ;; GNU SASL may print 'Trying ...' first.
82                         (or (not (looking-at "Trying "))
83                             (forward-line)
84                             t)
85                         (not (and (looking-at "\\* \\(OK\\|PREAUTH\\|BYE\\) ")
86                                   ;; success in imtest 1.6:
87                                   (re-search-forward
88                                    (concat "^\\(\\(Authenticat.*\\)\\|\\("
89                                            "Client authentication "
90                                            "finished.*\\)\\)")
91                                    nil t)
92                                   (setq response (match-string 1)))))
93               (accept-process-output process 1)
94               (sit-for 1))
95             (erase-buffer)
96             (message "GSSAPI connection: %s" (or response "failed"))
97             (if (and response (let ((case-fold-search nil))
98                                 (not (string-match "failed" response))))
99                 (setq done process)
100               (delete-process process)
101               nil))))
102       done)))
103
104 (provide 'gssapi)
105
106 ;;; gssapi.el ends here