crypto/openssh/auth-skey.c

   1 /* $OpenBSD: auth-skey.c,v 1.27 2007/01/21 01:41:54 stevesk Exp $ */
   2 /*
   3  * Copyright (c) 2001 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 #ifdef SKEY
  29
  30 #include <sys/types.h>
  31
  32 #include <pwd.h>
  33 #include <stdio.h>
  34
  35 #include <skey.h>
  36
  37 #include "xmalloc.h"
  38 #include "key.h"
  39 #include "hostfile.h"
  40 #include "auth.h"
  41 #include "ssh-gss.h"
  42 #include "log.h"
  43 #include "monitor_wrap.h"
  44
  45 static void *
  46 skey_init_ctx(Authctxt *authctxt)
  47 {
  48         return authctxt;
  49 }
  50
  51 int
  52 skey_query(void *ctx, char **name, char **infotxt,
  53     u_int* numprompts, char ***prompts, u_int **echo_on)
  54 {
  55         Authctxt *authctxt = ctx;
  56         char challenge[1024];
  57         struct skey skey;
  58
  59         if (_compat_skeychallenge(&skey, authctxt->user, challenge,
  60             sizeof(challenge)) == -1)
  61                 return -1;
  62
  63         *name = xstrdup("");
  64         *infotxt = xstrdup("");
  65         *numprompts = 1;
  66         *prompts = xcalloc(*numprompts, sizeof(char *));
  67         *echo_on = xcalloc(*numprompts, sizeof(u_int));
  68
  69         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
  70
  71         return 0;
  72 }
  73
  74 int
  75 skey_respond(void *ctx, u_int numresponses, char **responses)
  76 {
  77         Authctxt *authctxt = ctx;
  78
  79         if (authctxt->valid &&
  80             numresponses == 1 &&
  81             skey_haskey(authctxt->pw->pw_name) == 0 &&
  82             skey_passcheck(authctxt->pw->pw_name, responses[0]) != -1)
  83             return 0;
  84         return -1;
  85 }
  86
  87 static void
  88 skey_free_ctx(void *ctx)
  89 {
  90         /* we don't have a special context */
  91 }
  92
  93 KbdintDevice skey_device = {
  94         "skey",
  95         skey_init_ctx,
  96         skey_query,
  97         skey_respond,
  98         skey_free_ctx
  99 };
 100
 101 KbdintDevice mm_skey_device = {
 102         "skey",
 103         skey_init_ctx,
 104         mm_skey_query,
 105         mm_skey_respond,
 106         skey_free_ctx
 107 };
 108 #endif /* SKEY */