[gssapi-openssh.git] / openssh / 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"
#include "servconf.h"

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

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

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

#ifdef USE_PAM
	if (!options.use_pam)
		remove_kbdint_device("pam");
#endif

	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
3c0ef626	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
	25	#include "includes.h"
cdd66111	26	RCSID("$OpenBSD: auth-chall.c,v 1.9 2003/11/03 09:03:37 djm Exp $");
3c0ef626	27
	28	#include "auth.h"
	29	#include "log.h"
	30	#include "xmalloc.h"
996d5e62	31	#include "servconf.h"
3c0ef626	32
	33	/* limited protocol v1 interface to kbd-interactive authentication */
	34
	35	extern KbdintDevice *devices[];
	36	static KbdintDevice *device;
996d5e62	37	extern ServerOptions options;
3c0ef626	38
	39	char *
	40	get_challenge(Authctxt *authctxt)
	41	{
	42	char challenge, name, info, *prompts;
	43	u_int i, numprompts;
	44	u_int *echo_on;
	45
996d5e62	46	#ifdef USE_PAM
	47	if (!options.use_pam)
	48	remove_kbdint_device("pam");
	49	#endif
	50
3c0ef626	51	device = devices[0]; /* we always use the 1st device for protocol 1 */
	52	if (device == NULL)
	53	return NULL;
	54	if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
	55	return NULL;
	56	if (device->query(authctxt->kbdintctxt, &name, &info,
	57	&numprompts, &prompts, &echo_on)) {
	58	device->free_ctx(authctxt->kbdintctxt);
	59	authctxt->kbdintctxt = NULL;
	60	return NULL;
	61	}
	62	if (numprompts < 1)
	63	fatal("get_challenge: numprompts < 1");
	64	challenge = xstrdup(prompts[0]);
	65	for (i = 0; i < numprompts; i++)
	66	xfree(prompts[i]);
	67	xfree(prompts);
	68	xfree(name);
	69	xfree(echo_on);
	70	xfree(info);
	71
	72	return (challenge);
	73	}
	74	int
	75	verify_response(Authctxt authctxt, const char response)
	76	{
cdd66111	77	char resp[1], name, info, *prompts;
	78	u_int i, numprompts, *echo_on;
	79	int authenticated = 0;
3c0ef626	80
	81	if (device == NULL)
	82	return 0;
	83	if (authctxt->kbdintctxt == NULL)
	84	return 0;
	85	resp[0] = (char *)response;
cdd66111	86	switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
	87	case 0: /* Success */
	88	authenticated = 1;
	89	break;
	90	case 1: /* Postponed - retry with empty query for PAM */
	91	if ((device->query(authctxt->kbdintctxt, &name, &info,
	92	&numprompts, &prompts, &echo_on)) != 0)
	93	break;
	94	if (numprompts == 0 &&
	95	device->respond(authctxt->kbdintctxt, 0, resp) == 0)
	96	authenticated = 1;
0fff78ff	97
cdd66111	98	for (i = 0; i < numprompts; i++)
	99	xfree(prompts[i]);
	100	xfree(prompts);
	101	xfree(name);
	102	xfree(echo_on);
	103	xfree(info);
	104	break;
0fff78ff	105	}
3c0ef626	106	device->free_ctx(authctxt->kbdintctxt);
3c0ef626	107	authctxt->kbdintctxt = NULL;
cdd66111	108	return authenticated;
3c0ef626	109	}
0fff78ff	110	void
	111	abandon_challenge_response(Authctxt *authctxt)
	112	{
	113	if (authctxt->kbdintctxt != NULL) {
	114	device->free_ctx(authctxt->kbdintctxt);
	115	authctxt->kbdintctxt = NULL;
	116	}
	117	}