crypto/openssh/auth2-kbdint.c

   1 /* $OpenBSD: auth2-kbdint.c,v 1.14 2021/12/19 22:12:07 djm Exp $ */
   2 /*
   3  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "includes.h"
  27
  28 #include <sys/types.h>
  29
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <stdarg.h>
  33
  34 #include "xmalloc.h"
  35 #include "packet.h"
  36 #include "hostfile.h"
  37 #include "auth.h"
  38 #include "log.h"
  39 #include "misc.h"
  40 #include "servconf.h"
  41 #include "ssherr.h"
  42
  43 /* import */
  44 extern ServerOptions options;
  45
  46 static int
  47 userauth_kbdint(struct ssh *ssh, const char *method)
  48 {
  49         int r, authenticated = 0;
  50         char *lang, *devs;
  51
  52         if ((r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0 ||
  53             (r = sshpkt_get_cstring(ssh, &devs, NULL)) != 0 ||
  54             (r = sshpkt_get_end(ssh)) != 0)
  55                 fatal_fr(r, "parse packet");
  56
  57         debug("keyboard-interactive devs %s", devs);
  58
  59         if (options.kbd_interactive_authentication)
  60                 authenticated = auth2_challenge(ssh, devs);
  61
  62         free(devs);
  63         free(lang);
  64         return authenticated;
  65 }
  66
  67 Authmethod method_kbdint = {
  68         "keyboard-interactive",
  69         NULL,
  70         userauth_kbdint,
  71         &options.kbd_interactive_authentication
  72 };