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Have keyboard-interactive code call the drivers even for responses for
invalid logins.  This allows the drivers themselves to decide how to handle
them and prevent leaking information where possible.  Existing behaviour for
bsdauth is maintained by checking authctxt->valid in the bsdauth driver.
Note that any third-party kbdint drivers will now need to be able to handle
responses for invalid logins.  ok markus@

/*
 * Copyright (c) 2001 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "includes.h"
RCSID("$OpenBSD: auth-bsdauth.c,v 1.6 2005/01/19 13:11:47 dtucker Exp $");

#ifdef BSD_AUTH
#include "xmalloc.h"
#include "auth.h"
#include "log.h"
#include "monitor_wrap.h"

static void *
bsdauth_init_ctx(Authctxt *authctxt)
{
	return authctxt;
}

int
bsdauth_query(void *ctx, char **name, char **infotxt,
   u_int *numprompts, char ***prompts, u_int **echo_on)
{
	Authctxt *authctxt = ctx;
	char *challenge = NULL;

	if (authctxt->as != NULL) {
		debug2("bsdauth_query: try reuse session");
		challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
		if (challenge == NULL) {
			auth_close(authctxt->as);
			authctxt->as = NULL;
		}
	}

	if (challenge == NULL) {
		debug2("bsdauth_query: new bsd auth session");
		debug3("bsdauth_query: style %s",
		    authctxt->style ? authctxt->style : "<default>");
		authctxt->as = auth_userchallenge(authctxt->user,
		    authctxt->style, "auth-ssh", &challenge);
		if (authctxt->as == NULL)
			challenge = NULL;
		debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
	}

	if (challenge == NULL)
		return -1;

	*name = xstrdup("");
	*infotxt = xstrdup("");
	*numprompts = 1;
	*prompts = xmalloc(*numprompts * sizeof(char *));
	*echo_on = xmalloc(*numprompts * sizeof(u_int));
	(*echo_on)[0] = 0;
	(*prompts)[0] = xstrdup(challenge);

	return 0;
}

int
bsdauth_respond(void *ctx, u_int numresponses, char **responses)
{
	Authctxt *authctxt = ctx;
	int authok;

	if (!authctxt->valid)
		return -1;

	if (authctxt->as == 0)
		error("bsdauth_respond: no bsd auth session");

	if (numresponses != 1)
		return -1;

	authok = auth_userresponse(authctxt->as, responses[0], 0);
	authctxt->as = NULL;
	debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);

	return (authok == 0) ? -1 : 0;
}

static void
bsdauth_free_ctx(void *ctx)
{
	Authctxt *authctxt = ctx;

	if (authctxt && authctxt->as) {
		auth_close(authctxt->as);
		authctxt->as = NULL;
	}
}

KbdintDevice bsdauth_device = {
	"bsdauth",
	bsdauth_init_ctx,
	bsdauth_query,
	bsdauth_respond,
	bsdauth_free_ctx
};

KbdintDevice mm_bsdauth_device = {
	"bsdauth",
	bsdauth_init_ctx,
	mm_bsdauth_query,
	mm_bsdauth_respond,
	bsdauth_free_ctx
};
#endif