[gssapi-openssh.git] / openssh / auth2-chall.c

/*
 * Copyright (c) 2001 Markus Friedl.  All rights reserved.
 * Copyright (c) 2001 Per Allansson.  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: auth2-chall.c,v 1.22 2005/01/19 13:11:47 dtucker Exp $");

#include "ssh2.h"
#include "auth.h"
#include "buffer.h"
#include "packet.h"
#include "xmalloc.h"
#include "dispatch.h"
#include "log.h"
#include "servconf.h"

/* import */
extern ServerOptions options;

static int auth2_challenge_start(Authctxt *);
static int send_userauth_info_request(Authctxt *);
static void input_userauth_info_response(int, u_int32_t, void *);

#ifdef BSD_AUTH
extern KbdintDevice bsdauth_device;
#else
#ifdef USE_PAM
extern KbdintDevice sshpam_device;
#endif
#ifdef SKEY
extern KbdintDevice skey_device;
#endif
#endif

KbdintDevice *devices[] = {
#ifdef BSD_AUTH
	&bsdauth_device,
#else
#ifdef USE_PAM
	&sshpam_device,
#endif
#ifdef SKEY
	&skey_device,
#endif
#endif
	NULL
};

typedef struct KbdintAuthctxt KbdintAuthctxt;
struct KbdintAuthctxt
{
	char *devices;
	void *ctxt;
	KbdintDevice *device;
	u_int nreq;
};

#ifdef USE_PAM
void
remove_kbdint_device(const char *devname)
{
	int i, j;

	for (i = 0; devices[i] != NULL; i++)
		if (strcmp(devices[i]->name, devname) == 0) {
			for (j = i; devices[j] != NULL; j++)
				devices[j] = devices[j+1];
			i--;
		}
}
#endif

static KbdintAuthctxt *
kbdint_alloc(const char *devs)
{
	KbdintAuthctxt *kbdintctxt;
	Buffer b;
	int i;

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

	kbdintctxt = xmalloc(sizeof(KbdintAuthctxt));
	if (strcmp(devs, "") == 0) {
		buffer_init(&b);
		for (i = 0; devices[i]; i++) {
			if (buffer_len(&b) > 0)
				buffer_append(&b, ",", 1);
			buffer_append(&b, devices[i]->name,
			    strlen(devices[i]->name));
		}
		buffer_append(&b, "\0", 1);
		kbdintctxt->devices = xstrdup(buffer_ptr(&b));
		buffer_free(&b);
	} else {
		kbdintctxt->devices = xstrdup(devs);
	}
	debug("kbdint_alloc: devices '%s'", kbdintctxt->devices);
	kbdintctxt->ctxt = NULL;
	kbdintctxt->device = NULL;
	kbdintctxt->nreq = 0;

	return kbdintctxt;
}
static void
kbdint_reset_device(KbdintAuthctxt *kbdintctxt)
{
	if (kbdintctxt->ctxt) {
		kbdintctxt->device->free_ctx(kbdintctxt->ctxt);
		kbdintctxt->ctxt = NULL;
	}
	kbdintctxt->device = NULL;
}
static void
kbdint_free(KbdintAuthctxt *kbdintctxt)
{
	if (kbdintctxt->device)
		kbdint_reset_device(kbdintctxt);
	if (kbdintctxt->devices) {
		xfree(kbdintctxt->devices);
		kbdintctxt->devices = NULL;
	}
	xfree(kbdintctxt);
}
/* get next device */
static int
kbdint_next_device(KbdintAuthctxt *kbdintctxt)
{
	size_t len;
	char *t;
	int i;

	if (kbdintctxt->device)
		kbdint_reset_device(kbdintctxt);
	do {
		len = kbdintctxt->devices ?
		    strcspn(kbdintctxt->devices, ",") : 0;

		if (len == 0)
			break;
		for (i = 0; devices[i]; i++)
			if (strncmp(kbdintctxt->devices, devices[i]->name, len) == 0)
				kbdintctxt->device = devices[i];
		t = kbdintctxt->devices;
		kbdintctxt->devices = t[len] ? xstrdup(t+len+1) : NULL;
		xfree(t);
		debug2("kbdint_next_device: devices %s", kbdintctxt->devices ?
		   kbdintctxt->devices : "<empty>");
	} while (kbdintctxt->devices && !kbdintctxt->device);

	return kbdintctxt->device ? 1 : 0;
}

/*
 * try challenge-response, set authctxt->postponed if we have to
 * wait for the response.
 */
int
auth2_challenge(Authctxt *authctxt, char *devs)
{
	debug("auth2_challenge: user=%s devs=%s",
	    authctxt->user ? authctxt->user : "<nouser>",
	    devs ? devs : "<no devs>");

	if (authctxt->user == NULL || !devs)
		return 0;
	if (authctxt->kbdintctxt == NULL)
		authctxt->kbdintctxt = kbdint_alloc(devs);
	return auth2_challenge_start(authctxt);
}

/* unregister kbd-int callbacks and context */
void
auth2_challenge_stop(Authctxt *authctxt)
{
	/* unregister callback */
	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
	if (authctxt->kbdintctxt != NULL)  {
		kbdint_free(authctxt->kbdintctxt);
		authctxt->kbdintctxt = NULL;
	}
}

/* side effect: sets authctxt->postponed if a reply was sent*/
static int
auth2_challenge_start(Authctxt *authctxt)
{
	KbdintAuthctxt *kbdintctxt = authctxt->kbdintctxt;

	debug2("auth2_challenge_start: devices %s",
	    kbdintctxt->devices ?  kbdintctxt->devices : "<empty>");

	if (kbdint_next_device(kbdintctxt) == 0) {
		auth2_challenge_stop(authctxt);
		return 0;
	}
	debug("auth2_challenge_start: trying authentication method '%s'",
	    kbdintctxt->device->name);

	if ((kbdintctxt->ctxt = kbdintctxt->device->init_ctx(authctxt)) == NULL) {
		auth2_challenge_stop(authctxt);
		return 0;
	}
	if (send_userauth_info_request(authctxt) == 0) {
		auth2_challenge_stop(authctxt);
		return 0;
	}
	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
	    &input_userauth_info_response);

	authctxt->postponed = 1;
	return 0;
}

static int
send_userauth_info_request(Authctxt *authctxt)
{
	KbdintAuthctxt *kbdintctxt;
	char *name, *instr, **prompts;
	int i;
	u_int *echo_on;

	kbdintctxt = authctxt->kbdintctxt;
	if (kbdintctxt->device->query(kbdintctxt->ctxt,
	    &name, &instr, &kbdintctxt->nreq, &prompts, &echo_on))
		return 0;

	packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
	packet_put_cstring(name);
	packet_put_cstring(instr);
	packet_put_cstring("");		/* language not used */
	packet_put_int(kbdintctxt->nreq);
	for (i = 0; i < kbdintctxt->nreq; i++) {
		packet_put_cstring(prompts[i]);
		packet_put_char(echo_on[i]);
	}
	packet_send();
	packet_write_wait();

	for (i = 0; i < kbdintctxt->nreq; i++)
		xfree(prompts[i]);
	xfree(prompts);
	xfree(echo_on);
	xfree(name);
	xfree(instr);
	return 1;
}

static void
input_userauth_info_response(int type, u_int32_t seq, void *ctxt)
{
	Authctxt *authctxt = ctxt;
	KbdintAuthctxt *kbdintctxt;
	int i, authenticated = 0, res, len;
	u_int nresp;
	char **response = NULL, *method;

	if (authctxt == NULL)
		fatal("input_userauth_info_response: no authctxt");
	kbdintctxt = authctxt->kbdintctxt;
	if (kbdintctxt == NULL || kbdintctxt->ctxt == NULL)
		fatal("input_userauth_info_response: no kbdintctxt");
	if (kbdintctxt->device == NULL)
		fatal("input_userauth_info_response: no device");

	authctxt->postponed = 0;	/* reset */
	nresp = packet_get_int();
	if (nresp != kbdintctxt->nreq)
		fatal("input_userauth_info_response: wrong number of replies");
	if (nresp > 100)
		fatal("input_userauth_info_response: too many replies");
	if (nresp > 0) {
		response = xmalloc(nresp * sizeof(char *));
		for (i = 0; i < nresp; i++)
			response[i] = packet_get_string(NULL);
	}
	packet_check_eom();

	res = kbdintctxt->device->respond(kbdintctxt->ctxt, nresp, response);

	for (i = 0; i < nresp; i++) {
		memset(response[i], 'r', strlen(response[i]));
		xfree(response[i]);
	}
	if (response)
		xfree(response);

	switch (res) {
	case 0:
		/* Success! */
		authenticated = authctxt->valid ? 1 : 0;
		break;
	case 1:
		/* Authentication needs further interaction */
		if (send_userauth_info_request(authctxt) == 1)
			authctxt->postponed = 1;
		break;
	default:
		/* Failure! */
		break;
	}

	len = strlen("keyboard-interactive") + 2 +
		strlen(kbdintctxt->device->name);
	method = xmalloc(len);
	snprintf(method, len, "keyboard-interactive/%s",
	    kbdintctxt->device->name);

	if (!authctxt->postponed) {
		if (authenticated) {
			auth2_challenge_stop(authctxt);
		} else {
			/* start next device */
			/* may set authctxt->postponed */
			auth2_challenge_start(authctxt);
		}
	}
	userauth_finish(authctxt, authenticated, method);
	xfree(method);
}

void
privsep_challenge_enable(void)
{
#if defined(BSD_AUTH) || defined(USE_PAM) || defined(SKEY)
	int n = 0;
#endif
#ifdef BSD_AUTH
	extern KbdintDevice mm_bsdauth_device;
#endif
#ifdef USE_PAM
	extern KbdintDevice mm_sshpam_device;
#endif
#ifdef SKEY
	extern KbdintDevice mm_skey_device;
#endif

#ifdef BSD_AUTH
	devices[n++] = &mm_bsdauth_device;
#else
#ifdef USE_PAM
	devices[n++] = &mm_sshpam_device;
#endif
#ifdef SKEY
	devices[n++] = &mm_skey_device;
#endif
#endif
}
Commit	Line	Data
3c0ef626	1	/*
	2	* Copyright (c) 2001 Markus Friedl. All rights reserved.
	3	* Copyright (c) 2001 Per Allansson. 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	#include "includes.h"
996d5e62	26	RCSID("$OpenBSD: auth2-chall.c,v 1.22 2005/01/19 13:11:47 dtucker Exp $");
3c0ef626	27
	28	#include "ssh2.h"
	29	#include "auth.h"
e9a17296	30	#include "buffer.h"
3c0ef626	31	#include "packet.h"
	32	#include "xmalloc.h"
	33	#include "dispatch.h"
3c0ef626	34	#include "log.h"
996d5e62	35	#include "servconf.h"
	36
	37	/* import */
	38	extern ServerOptions options;
3c0ef626	39
	40	static int auth2_challenge_start(Authctxt *);
	41	static int send_userauth_info_request(Authctxt *);
e9a17296	42	static void input_userauth_info_response(int, u_int32_t, void *);
3c0ef626	43
	44	#ifdef BSD_AUTH
	45	extern KbdintDevice bsdauth_device;
	46	#else
0fff78ff	47	#ifdef USE_PAM
	48	extern KbdintDevice sshpam_device;
	49	#endif
3c0ef626	50	#ifdef SKEY
	51	extern KbdintDevice skey_device;
	52	#endif
	53	#endif
	54
	55	KbdintDevice *devices[] = {
	56	#ifdef BSD_AUTH
	57	&bsdauth_device,
	58	#else
0fff78ff	59	#ifdef USE_PAM
	60	&sshpam_device,
	61	#endif
3c0ef626	62	#ifdef SKEY
	63	&skey_device,
	64	#endif
	65	#endif
	66	NULL
	67	};
	68
	69	typedef struct KbdintAuthctxt KbdintAuthctxt;
	70	struct KbdintAuthctxt
	71	{
	72	char *devices;
	73	void *ctxt;
	74	KbdintDevice *device;
680cee3b	75	u_int nreq;
3c0ef626	76	};
3c0ef626	77
996d5e62	78	#ifdef USE_PAM
	79	void
	80	remove_kbdint_device(const char *devname)
	81	{
	82	int i, j;
	83
	84	for (i = 0; devices[i] != NULL; i++)
	85	if (strcmp(devices[i]->name, devname) == 0) {
	86	for (j = i; devices[j] != NULL; j++)
	87	devices[j] = devices[j+1];
	88	i--;
	89	}
	90	}
	91	#endif
	92
3c0ef626	93	static KbdintAuthctxt *
	94	kbdint_alloc(const char *devs)
	95	{
	96	KbdintAuthctxt *kbdintctxt;
e9a17296	97	Buffer b;
3c0ef626	98	int i;
3c0ef626	99
996d5e62	100	#ifdef USE_PAM
	101	if (!options.use_pam)
	102	remove_kbdint_device("pam");
	103	#endif
	104
3c0ef626	105	kbdintctxt = xmalloc(sizeof(KbdintAuthctxt));
3c0ef626	106	if (strcmp(devs, "") == 0) {
e9a17296	107	buffer_init(&b);
3c0ef626	108	for (i = 0; devices[i]; i++) {
e9a17296	109	if (buffer_len(&b) > 0)
	110	buffer_append(&b, ",", 1);
	111	buffer_append(&b, devices[i]->name,
	112	strlen(devices[i]->name));
3c0ef626	113	}
e9a17296	114	buffer_append(&b, "\0", 1);
	115	kbdintctxt->devices = xstrdup(buffer_ptr(&b));
	116	buffer_free(&b);
3c0ef626	117	} else {
	118	kbdintctxt->devices = xstrdup(devs);
	119	}
e9a17296	120	debug("kbdint_alloc: devices '%s'", kbdintctxt->devices);
3c0ef626	121	kbdintctxt->ctxt = NULL;
3c0ef626	122	kbdintctxt->device = NULL;
680cee3b	123	kbdintctxt->nreq = 0;
3c0ef626	124
	125	return kbdintctxt;
	126	}
	127	static void
	128	kbdint_reset_device(KbdintAuthctxt *kbdintctxt)
	129	{
	130	if (kbdintctxt->ctxt) {
	131	kbdintctxt->device->free_ctx(kbdintctxt->ctxt);
	132	kbdintctxt->ctxt = NULL;
	133	}
	134	kbdintctxt->device = NULL;
	135	}
	136	static void
	137	kbdint_free(KbdintAuthctxt *kbdintctxt)
	138	{
	139	if (kbdintctxt->device)
	140	kbdint_reset_device(kbdintctxt);
	141	if (kbdintctxt->devices) {
	142	xfree(kbdintctxt->devices);
	143	kbdintctxt->devices = NULL;
	144	}
	145	xfree(kbdintctxt);
	146	}
	147	/* get next device */
	148	static int
	149	kbdint_next_device(KbdintAuthctxt *kbdintctxt)
	150	{
	151	size_t len;
	152	char *t;
	153	int i;
	154
	155	if (kbdintctxt->device)
	156	kbdint_reset_device(kbdintctxt);
	157	do {
	158	len = kbdintctxt->devices ?
	159	strcspn(kbdintctxt->devices, ",") : 0;
	160
	161	if (len == 0)
	162	break;
	163	for (i = 0; devices[i]; i++)
	164	if (strncmp(kbdintctxt->devices, devices[i]->name, len) == 0)
	165	kbdintctxt->device = devices[i];
	166	t = kbdintctxt->devices;
	167	kbdintctxt->devices = t[len] ? xstrdup(t+len+1) : NULL;
	168	xfree(t);
	169	debug2("kbdint_next_device: devices %s", kbdintctxt->devices ?
	170	kbdintctxt->devices : "<empty>");
	171	} while (kbdintctxt->devices && !kbdintctxt->device);
	172
	173	return kbdintctxt->device ? 1 : 0;
	174	}
	175
	176	/*
	177	* try challenge-response, set authctxt->postponed if we have to
	178	* wait for the response.
	179	*/
	180	int
	181	auth2_challenge(Authctxt authctxt, char devs)
	182	{
	183	debug("auth2_challenge: user=%s devs=%s",
	184	authctxt->user ? authctxt->user : "<nouser>",
	185	devs ? devs : "<no devs>");
	186
	187	if (authctxt->user == NULL \|\| !devs)
188	return 0;
e9a17296	189	if (authctxt->kbdintctxt == NULL)
3c0ef626	190	authctxt->kbdintctxt = kbdint_alloc(devs);
	191	return auth2_challenge_start(authctxt);
	192	}
	193
e9a17296	194	/* unregister kbd-int callbacks and context */
	195	void
	196	auth2_challenge_stop(Authctxt *authctxt)
	197	{
	198	/* unregister callback */
	199	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
	200	if (authctxt->kbdintctxt != NULL) {
	201	kbdint_free(authctxt->kbdintctxt);
	202	authctxt->kbdintctxt = NULL;
	203	}
	204	}
	205
3c0ef626	206	/* side effect: sets authctxt->postponed if a reply was sent*/
	207	static int
	208	auth2_challenge_start(Authctxt *authctxt)
	209	{
	210	KbdintAuthctxt *kbdintctxt = authctxt->kbdintctxt;
	211
	212	debug2("auth2_challenge_start: devices %s",
	213	kbdintctxt->devices ? kbdintctxt->devices : "<empty>");
	214
	215	if (kbdint_next_device(kbdintctxt) == 0) {
e9a17296	216	auth2_challenge_stop(authctxt);
3c0ef626	217	return 0;
	218	}
	219	debug("auth2_challenge_start: trying authentication method '%s'",
	220	kbdintctxt->device->name);
	221
	222	if ((kbdintctxt->ctxt = kbdintctxt->device->init_ctx(authctxt)) == NULL) {
e9a17296	223	auth2_challenge_stop(authctxt);
3c0ef626	224	return 0;
	225	}
	226	if (send_userauth_info_request(authctxt) == 0) {
e9a17296	227	auth2_challenge_stop(authctxt);
3c0ef626	228	return 0;
	229	}
	230	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
	231	&input_userauth_info_response);
	232
	233	authctxt->postponed = 1;
	234	return 0;
	235	}
	236
	237	static int
	238	send_userauth_info_request(Authctxt *authctxt)
	239	{
	240	KbdintAuthctxt *kbdintctxt;
	241	char name, instr, **prompts;
	242	int i;
680cee3b	243	u_int *echo_on;
3c0ef626	244
	245	kbdintctxt = authctxt->kbdintctxt;
	246	if (kbdintctxt->device->query(kbdintctxt->ctxt,
680cee3b	247	&name, &instr, &kbdintctxt->nreq, &prompts, &echo_on))
3c0ef626	248	return 0;
	249
	250	packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
	251	packet_put_cstring(name);
	252	packet_put_cstring(instr);
f5799ae1	253	packet_put_cstring(""); /* language not used */
680cee3b	254	packet_put_int(kbdintctxt->nreq);
680cee3b	255	for (i = 0; i < kbdintctxt->nreq; i++) {
3c0ef626	256	packet_put_cstring(prompts[i]);
	257	packet_put_char(echo_on[i]);
	258	}
	259	packet_send();
	260	packet_write_wait();
	261
680cee3b	262	for (i = 0; i < kbdintctxt->nreq; i++)
3c0ef626	263	xfree(prompts[i]);
	264	xfree(prompts);
	265	xfree(echo_on);
	266	xfree(name);
	267	xfree(instr);
	268	return 1;
	269	}
	270
	271	static void
e9a17296	272	input_userauth_info_response(int type, u_int32_t seq, void *ctxt)
3c0ef626	273	{
	274	Authctxt *authctxt = ctxt;
	275	KbdintAuthctxt *kbdintctxt;
	276	int i, authenticated = 0, res, len;
	277	u_int nresp;
	278	char *response = NULL, method;
	279
	280	if (authctxt == NULL)
	281	fatal("input_userauth_info_response: no authctxt");
	282	kbdintctxt = authctxt->kbdintctxt;
	283	if (kbdintctxt == NULL \|\| kbdintctxt->ctxt == NULL)
	284	fatal("input_userauth_info_response: no kbdintctxt");
	285	if (kbdintctxt->device == NULL)
	286	fatal("input_userauth_info_response: no device");
	287
	288	authctxt->postponed = 0; /* reset */
	289	nresp = packet_get_int();
680cee3b	290	if (nresp != kbdintctxt->nreq)
	291	fatal("input_userauth_info_response: wrong number of replies");
	292	if (nresp > 100)
	293	fatal("input_userauth_info_response: too many replies");
3c0ef626	294	if (nresp > 0) {
41b2f314	295	response = xmalloc(nresp * sizeof(char *));
3c0ef626	296	for (i = 0; i < nresp; i++)
	297	response[i] = packet_get_string(NULL);
	298	}
e9a17296	299	packet_check_eom();
3c0ef626	300
996d5e62	301	res = kbdintctxt->device->respond(kbdintctxt->ctxt, nresp, response);
3c0ef626	302
	303	for (i = 0; i < nresp; i++) {
	304	memset(response[i], 'r', strlen(response[i]));
	305	xfree(response[i]);
	306	}
	307	if (response)
	308	xfree(response);
	309
	310	switch (res) {
	311	case 0:
	312	/* Success! */
996d5e62	313	authenticated = authctxt->valid ? 1 : 0;
3c0ef626	314	break;
	315	case 1:
	316	/* Authentication needs further interaction */
e9a17296	317	if (send_userauth_info_request(authctxt) == 1)
e9a17296	318	authctxt->postponed = 1;
3c0ef626	319	break;
	320	default:
	321	/* Failure! */
	322	break;
	323	}
	324
	325	len = strlen("keyboard-interactive") + 2 +
	326	strlen(kbdintctxt->device->name);
	327	method = xmalloc(len);
e9a17296	328	snprintf(method, len, "keyboard-interactive/%s",
e9a17296	329	kbdintctxt->device->name);
3c0ef626	330
3c0ef626	331	if (!authctxt->postponed) {
3c0ef626	332	if (authenticated) {
e9a17296	333	auth2_challenge_stop(authctxt);
3c0ef626	334	} else {
	335	/* start next device */
	336	/* may set authctxt->postponed */
	337	auth2_challenge_start(authctxt);
	338	}
	339	}
	340	userauth_finish(authctxt, authenticated, method);
	341	xfree(method);
	342	}
700318f3	343
	344	void
	345	privsep_challenge_enable(void)
	346	{
0fff78ff	347	#if defined(BSD_AUTH) \|\| defined(USE_PAM) \|\| defined(SKEY)
	348	int n = 0;
	349	#endif
700318f3	350	#ifdef BSD_AUTH
	351	extern KbdintDevice mm_bsdauth_device;
	352	#endif
0fff78ff	353	#ifdef USE_PAM
	354	extern KbdintDevice mm_sshpam_device;
	355	#endif
700318f3	356	#ifdef SKEY
	357	extern KbdintDevice mm_skey_device;
	358	#endif
0fff78ff	359
700318f3	360	#ifdef BSD_AUTH
0fff78ff	361	devices[n++] = &mm_bsdauth_device;
700318f3	362	#else
0fff78ff	363	#ifdef USE_PAM
	364	devices[n++] = &mm_sshpam_device;
	365	#endif
700318f3	366	#ifdef SKEY
0fff78ff	367	devices[n++] = &mm_skey_device;
700318f3	368	#endif
	369	#endif
	370	}