crypto/openssh/auth2-passwd.c

   1 /* $OpenBSD: auth2-passwd.c,v 1.21 2022/05/27 04:29:40 dtucker 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 <string.h>
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34
  35 #include "packet.h"
  36 #include "ssherr.h"
  37 #include "log.h"
  38 #include "sshkey.h"
  39 #include "hostfile.h"
  40 #include "auth.h"
  41 #ifdef GSSAPI
  42 #include "ssh-gss.h"
  43 #endif
  44 #include "monitor_wrap.h"
  45 #include "misc.h"
  46 #include "servconf.h"
  47
  48 /* import */
  49 extern ServerOptions options;
  50
  51 static int
  52 userauth_passwd(struct ssh *ssh, const char *method)
  53 {
  54         char *password = NULL;
  55         int authenticated = 0, r;
  56         u_char change;
  57         size_t len = 0;
  58
  59         if ((r = sshpkt_get_u8(ssh, &change)) != 0 ||
  60             (r = sshpkt_get_cstring(ssh, &password, &len)) != 0 ||
  61             (change && (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0) ||
  62             (r = sshpkt_get_end(ssh)) != 0) {
  63                 freezero(password, len);
  64                 fatal_fr(r, "parse packet");
  65         }
  66
  67         if (change)
  68                 logit("password change not supported");
  69         else if (PRIVSEP(auth_password(ssh, password)) == 1)
  70                 authenticated = 1;
  71         freezero(password, len);
  72         return authenticated;
  73 }
  74
  75 Authmethod method_passwd = {
  76         "password",
  77         NULL,
  78         userauth_passwd,
  79         &options.password_authentication
  80 };