crypto/openssh-4/auth-skey.c

   1 /*
   2  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24 #include "includes.h"
  25 RCSID("$OpenBSD: auth-skey.c,v 1.20 2002/06/30 21:59:45 deraadt Exp $");
  26
  27 #ifdef SKEY
  28
  29 #include <skey.h>
  30
  31 #include "xmalloc.h"
  32 #include "auth.h"
  33 #include "monitor_wrap.h"
  34
  35 static void *
  36 skey_init_ctx(Authctxt *authctxt)
  37 {
  38         return authctxt;
  39 }
  40
  41 int
  42 skey_query(void *ctx, char **name, char **infotxt,
  43     u_int* numprompts, char ***prompts, u_int **echo_on)
  44 {
  45         Authctxt *authctxt = ctx;
  46         char challenge[1024], *p;
  47         int len;
  48         struct skey skey;
  49
  50         if (_compat_skeychallenge(&skey, authctxt->user, challenge,
  51             sizeof(challenge)) == -1)
  52                 return -1;
  53
  54         *name  = xstrdup("");
  55         *infotxt  = xstrdup("");
  56         *numprompts = 1;
  57         *prompts = xmalloc(*numprompts * sizeof(char *));
  58         *echo_on = xmalloc(*numprompts * sizeof(u_int));
  59         (*echo_on)[0] = 0;
  60
  61         len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
  62         p = xmalloc(len);
  63         strlcpy(p, challenge, len);
  64         strlcat(p, SKEY_PROMPT, len);
  65         (*prompts)[0] = p;
  66
  67         return 0;
  68 }
  69
  70 int
  71 skey_respond(void *ctx, u_int numresponses, char **responses)
  72 {
  73         Authctxt *authctxt = ctx;
  74
  75         if (authctxt->valid &&
  76             numresponses == 1 &&
  77             skey_haskey(authctxt->pw->pw_name) == 0 &&
  78             skey_passcheck(authctxt->pw->pw_name, responses[0]) != -1)
  79             return 0;
  80         return -1;
  81 }
  82
  83 static void
  84 skey_free_ctx(void *ctx)
  85 {
  86         /* we don't have a special context */
  87 }
  88
  89 KbdintDevice skey_device = {
  90         "skey",
  91         skey_init_ctx,
  92         skey_query,
  93         skey_respond,
  94         skey_free_ctx
  95 };
  96
  97 KbdintDevice mm_skey_device = {
  98         "skey",
  99         skey_init_ctx,
 100         mm_skey_query,
 101         mm_skey_respond,
 102         skey_free_ctx
 103 };
 104 #endif /* SKEY */