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;;; gssapi.el --- GSSAPI/Kerberos 5 interface for Emacs
;; Copyright (C) 2011-2021 Free Software Foundation, Inc.
;; Author: Simon Josefsson <simon@josefsson.org>
;; Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: network
;; This file is part of GNU Emacs.
;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(defcustom gssapi-program (list
(concat "gsasl %s %p "
"--mechanism GSSAPI "
"--authentication-id %l")
"imtest -m gssapi -u %l -p %p %s")
"List of strings containing commands for GSSAPI (krb5) authentication.
%s is replaced with server hostname, %p with port to connect to,
and %l with the user name. The program should accept commands on
stdin and return responses to stdout. Each entry in the list is
tried until a successful connection is made."
:version "24.1"
:group 'network
:type '(repeat string))
(defun open-gssapi-stream (name buffer server port user)
(let ((cmds gssapi-program)
cmd done)
(with-current-buffer buffer
(while (and (not done)
(setq cmd (pop cmds)))
(message "Opening GSSAPI connection with `%s'..." cmd)
(erase-buffer)
(let* ((coding-system-for-read 'binary)
(coding-system-for-write 'binary)
(process (start-process
name buffer shell-file-name shell-command-switch
(format-spec cmd `((?s . ,server)
(?p . ,(number-to-string port))
(?l . ,user)))))
response)
(when process
(while (and (memq (process-status process) '(open run))
(goto-char (point-min))
;; Athena IMTEST can output SSL verify errors
(or (while (looking-at "^verify error:num=")
(forward-line))
t)
(or (while (looking-at "^TLS connection established")
(forward-line))
t)
;; cyrus 1.6.x (13? < x <= 22) queries capabilities
(or (while (looking-at "^C:")
(forward-line))
t)
;; cyrus 1.6 imtest print "S: " before server greeting
(or (not (looking-at "S: "))
(forward-char 3)
t)
;; GNU SASL may print 'Trying ...' first.
(or (not (looking-at "Trying "))
(forward-line)
t)
(not (and (looking-at "\\* \\(OK\\|PREAUTH\\|BYE\\) ")
;; success in imtest 1.6:
(re-search-forward
(concat "^\\(\\(Authenticat.*\\)\\|\\("
"Client authentication "
"finished.*\\)\\)")
nil t)
(setq response (match-string 1)))))
(accept-process-output process 1)
(sit-for 1))
(erase-buffer)
(message "GSSAPI connection: %s" (or response "failed"))
(if (and response (let ((case-fold-search nil))
(not (string-match "failed" response))))
(setq done process)
(delete-process process)
nil))))
done)))
(provide 'gssapi)
;;; gssapi.el ends here
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