[openssh.git] / auth-chall.c

/*
 * 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-chall.c,v 1.9 2003/11/03 09:03:37 djm Exp $");

#include "auth.h"
#include "log.h"
#include "xmalloc.h"

/* limited protocol v1 interface to kbd-interactive authentication */

extern KbdintDevice *devices[];
static KbdintDevice *device;

char *
get_challenge(Authctxt *authctxt)
{
	char *challenge, *name, *info, **prompts;
	u_int i, numprompts;
	u_int *echo_on;

	device = devices[0]; /* we always use the 1st device for protocol 1 */
	if (device == NULL)
		return NULL;
	if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
		return NULL;
	if (device->query(authctxt->kbdintctxt, &name, &info,
	    &numprompts, &prompts, &echo_on)) {
		device->free_ctx(authctxt->kbdintctxt);
		authctxt->kbdintctxt = NULL;
		return NULL;
	}
	if (numprompts < 1)
		fatal("get_challenge: numprompts < 1");
	challenge = xstrdup(prompts[0]);
	for (i = 0; i < numprompts; i++)
		xfree(prompts[i]);
	xfree(prompts);
	xfree(name);
	xfree(echo_on);
	xfree(info);

	return (challenge);
}
int
verify_response(Authctxt *authctxt, const char *response)
{
	char *resp[1], *name, *info, **prompts;
	u_int i, numprompts, *echo_on;
	int authenticated = 0;

	if (device == NULL)
		return 0;
	if (authctxt->kbdintctxt == NULL)
		return 0;
	resp[0] = (char *)response;
	switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
	case 0: /* Success */
		authenticated = 1;
		break;
	case 1: /* Postponed - retry with empty query for PAM */
		if ((device->query(authctxt->kbdintctxt, &name, &info,
		    &numprompts, &prompts, &echo_on)) != 0)
			break;
		if (numprompts == 0 && 
		    device->respond(authctxt->kbdintctxt, 0, resp) == 0)
			authenticated = 1;

		for (i = 0; i < numprompts; i++)
			xfree(prompts[i]);
		xfree(prompts);
		xfree(name);
		xfree(echo_on);
		xfree(info);
		break;
	}
	device->free_ctx(authctxt->kbdintctxt);
	authctxt->kbdintctxt = NULL;
	return authenticated;
}
void
abandon_challenge_response(Authctxt *authctxt)
{
	if (authctxt->kbdintctxt != NULL) {
		device->free_ctx(authctxt->kbdintctxt);
		authctxt->kbdintctxt = NULL;
	}
}
Commit	Line	Data
59c97189	1	/*
f3c7c613	2	* Copyright (c) 2001 Markus Friedl. All rights reserved.
59c97189	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
	25	#include "includes.h"
85a68682	26	RCSID("$OpenBSD: auth-chall.c,v 1.9 2003/11/03 09:03:37 djm Exp $");
59c97189	27
59c97189	28	#include "auth.h"
af774732	29	#include "log.h"
5ba55ada	30	#include "xmalloc.h"
59c97189	31
5ba55ada	32	/* limited protocol v1 interface to kbd-interactive authentication */
af774732	33
5ba55ada	34	extern KbdintDevice *devices[];
5ba55ada	35	static KbdintDevice *device;
6005a40c	36
59c97189	37	char *
5ba55ada	38	get_challenge(Authctxt *authctxt)
59c97189	39	{
5ba55ada	40	char challenge, name, info, *prompts;
	41	u_int i, numprompts;
	42	u_int *echo_on;
	43
	44	device = devices[0]; /* we always use the 1st device for protocol 1 */
	45	if (device == NULL)
59c97189	46	return NULL;
5ba55ada	47	if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
	48	return NULL;
	49	if (device->query(authctxt->kbdintctxt, &name, &info,
	50	&numprompts, &prompts, &echo_on)) {
	51	device->free_ctx(authctxt->kbdintctxt);
	52	authctxt->kbdintctxt = NULL;
	53	return NULL;
	54	}
	55	if (numprompts < 1)
	56	fatal("get_challenge: numprompts < 1");
	57	challenge = xstrdup(prompts[0]);
	58	for (i = 0; i < numprompts; i++)
	59	xfree(prompts[i]);
	60	xfree(prompts);
	61	xfree(name);
	62	xfree(echo_on);
	63	xfree(info);
	64
	65	return (challenge);
59c97189	66	}
59c97189	67	int
5ba55ada	68	verify_response(Authctxt authctxt, const char response)
59c97189	69	{
85a68682	70	char resp[1], name, info, *prompts;
	71	u_int i, numprompts, *echo_on;
	72	int authenticated = 0;
5ba55ada	73
	74	if (device == NULL)
	75	return 0;
	76	if (authctxt->kbdintctxt == NULL)
	77	return 0;
	78	resp[0] = (char *)response;
85a68682	79	switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
	80	case 0: /* Success */
	81	authenticated = 1;
	82	break;
	83	case 1: /* Postponed - retry with empty query for PAM */
	84	if ((device->query(authctxt->kbdintctxt, &name, &info,
	85	&numprompts, &prompts, &echo_on)) != 0)
	86	break;
	87	if (numprompts == 0 &&
	88	device->respond(authctxt->kbdintctxt, 0, resp) == 0)
	89	authenticated = 1;
05114c74	90
85a68682	91	for (i = 0; i < numprompts; i++)
	92	xfree(prompts[i]);
	93	xfree(prompts);
	94	xfree(name);
	95	xfree(echo_on);
	96	xfree(info);
	97	break;
05114c74	98	}
5ba55ada	99	device->free_ctx(authctxt->kbdintctxt);
5ba55ada	100	authctxt->kbdintctxt = NULL;
85a68682	101	return authenticated;
59c97189	102	}
05114c74	103	void
	104	abandon_challenge_response(Authctxt *authctxt)
	105	{
	106	if (authctxt->kbdintctxt != NULL) {
	107	device->free_ctx(authctxt->kbdintctxt);
	108	authctxt->kbdintctxt = NULL;
	109	}
	110	}