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      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 */
    109