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auth-bsdauth.c revision 1.4 
      1 /*	$NetBSD: auth-bsdauth.c,v 1.4 2015/04/03 23:58:19 christos Exp $	*/
      2 /* $OpenBSD: auth-bsdauth.c,v 1.13 2014/06/24 01:13:21 djm Exp $ */
      3 /*
      4  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "includes.h"
     28 __RCSID("$NetBSD: auth-bsdauth.c,v 1.4 2015/04/03 23:58:19 christos Exp $");
     29 #include <sys/types.h>
     30 #include <stdarg.h>
     31 #include <stdio.h>
     32 
     33 #ifdef BSD_AUTH
     34 #include "xmalloc.h"
     35 #include "key.h"
     36 #include "hostfile.h"
     37 #include "auth.h"
     38 #include "log.h"
     39 #include "buffer.h"
     40 #ifdef GSSAPI
     41 #include "ssh-gss.h"
     42 #endif
     43 #include "monitor_wrap.h"
     44 
     45 static void *
     46 bsdauth_init_ctx(Authctxt *authctxt)
     47 {
     48 	return authctxt;
     49 }
     50 
     51 int
     52 bsdauth_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 = NULL;
     57 
     58 	*infotxt = NULL;
     59 	*numprompts = 0;
     60 	*prompts = NULL;
     61 	*echo_on = NULL;
     62 
     63 	if (authctxt->as != NULL) {
     64 		debug2("bsdauth_query: try reuse session");
     65 		challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
     66 		if (challenge == NULL) {
     67 			auth_close(authctxt->as);
     68 			authctxt->as = NULL;
     69 		}
     70 	}
     71 
     72 	if (challenge == NULL) {
     73 		debug2("bsdauth_query: new bsd auth session");
     74 		debug3("bsdauth_query: style %s",
     75 		    authctxt->style ? authctxt->style : "<default>");
     76 		authctxt->as = auth_userchallenge(authctxt->user,
     77 		    authctxt->style, "auth-ssh", &challenge);
     78 		if (authctxt->as == NULL)
     79 			challenge = NULL;
     80 		debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
     81 	}
     82 
     83 	if (challenge == NULL)
     84 		return -1;
     85 
     86 	*name = xstrdup("");
     87 	*infotxt = xstrdup("");
     88 	*numprompts = 1;
     89 	*prompts = xcalloc(*numprompts, sizeof(char *));
     90 	*echo_on = xcalloc(*numprompts, sizeof(u_int));
     91 	(*prompts)[0] = xstrdup(challenge);
     92 
     93 	return 0;
     94 }
     95 
     96 int
     97 bsdauth_respond(void *ctx, u_int numresponses, char **responses)
     98 {
     99 	Authctxt *authctxt = ctx;
    100 	int authok;
    101 
    102 	if (!authctxt->valid)
    103 		return -1;
    104 
    105 	if (authctxt->as == 0)
    106 		error("bsdauth_respond: no bsd auth session");
    107 
    108 	if (numresponses != 1)
    109 		return -1;
    110 
    111 	authok = auth_userresponse(authctxt->as, responses[0], 0);
    112 	authctxt->as = NULL;
    113 	debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
    114 
    115 	return (authok == 0) ? -1 : 0;
    116 }
    117 
    118 static void
    119 bsdauth_free_ctx(void *ctx)
    120 {
    121 	Authctxt *authctxt = ctx;
    122 
    123 	if (authctxt && authctxt->as) {
    124 		auth_close(authctxt->as);
    125 		authctxt->as = NULL;
    126 	}
    127 }
    128 
    129 KbdintDevice bsdauth_device = {
    130 	"bsdauth",
    131 	bsdauth_init_ctx,
    132 	bsdauth_query,
    133 	bsdauth_respond,
    134 	bsdauth_free_ctx
    135 };
    136 
    137 KbdintDevice mm_bsdauth_device = {
    138 	"bsdauth",
    139 	bsdauth_init_ctx,
    140 	mm_bsdauth_query,
    141 	mm_bsdauth_respond,
    142 	bsdauth_free_ctx
    143 };
    144 #endif
    145