[openssh.git] / auth2-chall.c

/* $OpenBSD: auth2-chall.c,v 1.34 2008/12/09 04:32:22 djm Exp $ */
/*
 * 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"

#include <sys/types.h>

#include <stdarg.h>
#include <stdio.h>
#include <string.h>

#include "xmalloc.h"
#include "ssh2.h"
#include "key.h"
#include "hostfile.h"
#include "auth.h"
#include "buffer.h"
#include "packet.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;
	u_int i, *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 authenticated = 0, res;
	u_int i, 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 = xcalloc(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;
	}

	xasprintf(&method, "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
7efff8ce	1	/* $OpenBSD: auth2-chall.c,v 1.34 2008/12/09 04:32:22 djm Exp $ */
59c97189	2	/*
f3c7c613	3	* Copyright (c) 2001 Markus Friedl. All rights reserved.
5ba55ada	4	* Copyright (c) 2001 Per Allansson. All rights reserved.
59c97189	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	*/
31652869	26
59c97189	27	#include "includes.h"
59c97189	28
31652869	29	#include <sys/types.h>
31652869	30
24436b92	31	#include <stdarg.h>
cf851879	32	#include <stdio.h>
00146caa	33	#include <string.h>
00146caa	34
31652869	35	#include "xmalloc.h"
59c97189	36	#include "ssh2.h"
31652869	37	#include "key.h"
31652869	38	#include "hostfile.h"
59c97189	39	#include "auth.h"
3469eac4	40	#include "buffer.h"
59c97189	41	#include "packet.h"
59c97189	42	#include "dispatch.h"
42f11eb2	43	#include "log.h"
c384a74c	44	#include "servconf.h"
	45
	46	/* import */
	47	extern ServerOptions options;
59c97189	48
396c147e	49	static int auth2_challenge_start(Authctxt *);
396c147e	50	static int send_userauth_info_request(Authctxt *);
7819b5c3	51	static void input_userauth_info_response(int, u_int32_t, void *);
5ba55ada	52
	53	#ifdef BSD_AUTH
	54	extern KbdintDevice bsdauth_device;
	55	#else
05114c74	56	#ifdef USE_PAM
	57	extern KbdintDevice sshpam_device;
	58	#endif
5ba55ada	59	#ifdef SKEY
	60	extern KbdintDevice skey_device;
	61	#endif
	62	#endif
	63
	64	KbdintDevice *devices[] = {
	65	#ifdef BSD_AUTH
	66	&bsdauth_device,
	67	#else
05114c74	68	#ifdef USE_PAM
	69	&sshpam_device,
	70	#endif
5ba55ada	71	#ifdef SKEY
	72	&skey_device,
	73	#endif
	74	#endif
	75	NULL
	76	};
	77
	78	typedef struct KbdintAuthctxt KbdintAuthctxt;
	79	struct KbdintAuthctxt
	80	{
	81	char *devices;
	82	void *ctxt;
	83	KbdintDevice *device;
477edc5d	84	u_int nreq;
5ba55ada	85	};
5ba55ada	86
c384a74c	87	#ifdef USE_PAM
	88	void
	89	remove_kbdint_device(const char *devname)
	90	{
	91	int i, j;
	92
	93	for (i = 0; devices[i] != NULL; i++)
	94	if (strcmp(devices[i]->name, devname) == 0) {
	95	for (j = i; devices[j] != NULL; j++)
	96	devices[j] = devices[j+1];
	97	i--;
	98	}
	99	}
	100	#endif
	101
396c147e	102	static KbdintAuthctxt *
5ba55ada	103	kbdint_alloc(const char *devs)
	104	{
	105	KbdintAuthctxt *kbdintctxt;
3469eac4	106	Buffer b;
5ba55ada	107	int i;
5ba55ada	108
c384a74c	109	#ifdef USE_PAM
	110	if (!options.use_pam)
	111	remove_kbdint_device("pam");
	112	#endif
	113
5ba55ada	114	kbdintctxt = xmalloc(sizeof(KbdintAuthctxt));
5ba55ada	115	if (strcmp(devs, "") == 0) {
3469eac4	116	buffer_init(&b);
5ba55ada	117	for (i = 0; devices[i]; i++) {
3469eac4	118	if (buffer_len(&b) > 0)
	119	buffer_append(&b, ",", 1);
	120	buffer_append(&b, devices[i]->name,
	121	strlen(devices[i]->name));
5ba55ada	122	}
3469eac4	123	buffer_append(&b, "\0", 1);
	124	kbdintctxt->devices = xstrdup(buffer_ptr(&b));
	125	buffer_free(&b);
5ba55ada	126	} else {
	127	kbdintctxt->devices = xstrdup(devs);
	128	}
3469eac4	129	debug("kbdint_alloc: devices '%s'", kbdintctxt->devices);
5ba55ada	130	kbdintctxt->ctxt = NULL;
5ba55ada	131	kbdintctxt->device = NULL;
477edc5d	132	kbdintctxt->nreq = 0;
5ba55ada	133
	134	return kbdintctxt;
	135	}
396c147e	136	static void
5ba55ada	137	kbdint_reset_device(KbdintAuthctxt *kbdintctxt)
	138	{
	139	if (kbdintctxt->ctxt) {
	140	kbdintctxt->device->free_ctx(kbdintctxt->ctxt);
	141	kbdintctxt->ctxt = NULL;
	142	}
	143	kbdintctxt->device = NULL;
	144	}
396c147e	145	static void
5ba55ada	146	kbdint_free(KbdintAuthctxt *kbdintctxt)
	147	{
	148	if (kbdintctxt->device)
	149	kbdint_reset_device(kbdintctxt);
	150	if (kbdintctxt->devices) {
	151	xfree(kbdintctxt->devices);
	152	kbdintctxt->devices = NULL;
	153	}
	154	xfree(kbdintctxt);
	155	}
	156	/* get next device */
396c147e	157	static int
5ba55ada	158	kbdint_next_device(KbdintAuthctxt *kbdintctxt)
	159	{
	160	size_t len;
	161	char *t;
	162	int i;
	163
	164	if (kbdintctxt->device)
	165	kbdint_reset_device(kbdintctxt);
	166	do {
	167	len = kbdintctxt->devices ?
	168	strcspn(kbdintctxt->devices, ",") : 0;
	169
	170	if (len == 0)
	171	break;
	172	for (i = 0; devices[i]; i++)
	173	if (strncmp(kbdintctxt->devices, devices[i]->name, len) == 0)
	174	kbdintctxt->device = devices[i];
	175	t = kbdintctxt->devices;
	176	kbdintctxt->devices = t[len] ? xstrdup(t+len+1) : NULL;
	177	xfree(t);
	178	debug2("kbdint_next_device: devices %s", kbdintctxt->devices ?
4e2e5cfd	179	kbdintctxt->devices : "<empty>");
5ba55ada	180	} while (kbdintctxt->devices && !kbdintctxt->device);
	181
	182	return kbdintctxt->device ? 1 : 0;
	183	}
59c97189	184
59c97189	185	/*
aa8003d6	186	* try challenge-response, set authctxt->postponed if we have to
59c97189	187	* wait for the response.
	188	*/
	189	int
	190	auth2_challenge(Authctxt authctxt, char devs)
	191	{
5ba55ada	192	debug("auth2_challenge: user=%s devs=%s",
	193	authctxt->user ? authctxt->user : "<nouser>",
	194	devs ? devs : "<no devs>");
	195
f5e69c65	196	if (authctxt->user == NULL \|\| !devs)
5ba55ada	197	return 0;
184eed6a	198	if (authctxt->kbdintctxt == NULL)
5ba55ada	199	authctxt->kbdintctxt = kbdint_alloc(devs);
	200	return auth2_challenge_start(authctxt);
	201	}
	202
2f293d43	203	/* unregister kbd-int callbacks and context */
	204	void
	205	auth2_challenge_stop(Authctxt *authctxt)
	206	{
	207	/* unregister callback */
	208	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
4f6e2ba9	209	if (authctxt->kbdintctxt != NULL) {
2f293d43	210	kbdint_free(authctxt->kbdintctxt);
	211	authctxt->kbdintctxt = NULL;
	212	}
	213	}
	214
5ba55ada	215	/* side effect: sets authctxt->postponed if a reply was sent*/
	216	static int
	217	auth2_challenge_start(Authctxt *authctxt)
	218	{
	219	KbdintAuthctxt *kbdintctxt = authctxt->kbdintctxt;
	220
	221	debug2("auth2_challenge_start: devices %s",
	222	kbdintctxt->devices ? kbdintctxt->devices : "<empty>");
	223
	224	if (kbdint_next_device(kbdintctxt) == 0) {
2f293d43	225	auth2_challenge_stop(authctxt);
5ba55ada	226	return 0;
	227	}
	228	debug("auth2_challenge_start: trying authentication method '%s'",
	229	kbdintctxt->device->name);
59c97189	230
5ba55ada	231	if ((kbdintctxt->ctxt = kbdintctxt->device->init_ctx(authctxt)) == NULL) {
2f293d43	232	auth2_challenge_stop(authctxt);
59c97189	233	return 0;
5ba55ada	234	}
5ba55ada	235	if (send_userauth_info_request(authctxt) == 0) {
2f293d43	236	auth2_challenge_stop(authctxt);
59c97189	237	return 0;
5ba55ada	238	}
59c97189	239	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
59c97189	240	&input_userauth_info_response);
5ba55ada	241
59c97189	242	authctxt->postponed = 1;
	243	return 0;
	244	}
	245
5ba55ada	246	static int
5ba55ada	247	send_userauth_info_request(Authctxt *authctxt)
59c97189	248	{
5ba55ada	249	KbdintAuthctxt *kbdintctxt;
5ba55ada	250	char name, instr, **prompts;
2ceb8101	251	u_int i, *echo_on;
5ba55ada	252
	253	kbdintctxt = authctxt->kbdintctxt;
	254	if (kbdintctxt->device->query(kbdintctxt->ctxt,
477edc5d	255	&name, &instr, &kbdintctxt->nreq, &prompts, &echo_on))
5ba55ada	256	return 0;
59c97189	257
59c97189	258	packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
5ba55ada	259	packet_put_cstring(name);
5ba55ada	260	packet_put_cstring(instr);
7203d6bb	261	packet_put_cstring(""); /* language not used */
477edc5d	262	packet_put_int(kbdintctxt->nreq);
477edc5d	263	for (i = 0; i < kbdintctxt->nreq; i++) {
5ba55ada	264	packet_put_cstring(prompts[i]);
	265	packet_put_char(echo_on[i]);
	266	}
59c97189	267	packet_send();
59c97189	268	packet_write_wait();
5ba55ada	269
477edc5d	270	for (i = 0; i < kbdintctxt->nreq; i++)
5ba55ada	271	xfree(prompts[i]);
	272	xfree(prompts);
	273	xfree(echo_on);
	274	xfree(name);
	275	xfree(instr);
	276	return 1;
59c97189	277	}
59c97189	278
5ba55ada	279	static void
7819b5c3	280	input_userauth_info_response(int type, u_int32_t seq, void *ctxt)
59c97189	281	{
59c97189	282	Authctxt *authctxt = ctxt;
5ba55ada	283	KbdintAuthctxt *kbdintctxt;
7efff8ce	284	int authenticated = 0, res;
2ceb8101	285	u_int i, nresp;
5ba55ada	286	char *response = NULL, method;
59c97189	287
	288	if (authctxt == NULL)
	289	fatal("input_userauth_info_response: no authctxt");
5ba55ada	290	kbdintctxt = authctxt->kbdintctxt;
	291	if (kbdintctxt == NULL \|\| kbdintctxt->ctxt == NULL)
	292	fatal("input_userauth_info_response: no kbdintctxt");
	293	if (kbdintctxt->device == NULL)
	294	fatal("input_userauth_info_response: no device");
59c97189	295
	296	authctxt->postponed = 0; /* reset */
	297	nresp = packet_get_int();
477edc5d	298	if (nresp != kbdintctxt->nreq)
	299	fatal("input_userauth_info_response: wrong number of replies");
	300	if (nresp > 100)
	301	fatal("input_userauth_info_response: too many replies");
5ba55ada	302	if (nresp > 0) {
52e3daed	303	response = xcalloc(nresp, sizeof(char *));
5ba55ada	304	for (i = 0; i < nresp; i++)
	305	response[i] = packet_get_string(NULL);
	306	}
95500969	307	packet_check_eom();
5ba55ada	308
37ea4f91	309	res = kbdintctxt->device->respond(kbdintctxt->ctxt, nresp, response);
5ba55ada	310
	311	for (i = 0; i < nresp; i++) {
	312	memset(response[i], 'r', strlen(response[i]));
	313	xfree(response[i]);
	314	}
	315	if (response)
59c97189	316	xfree(response);
5ba55ada	317
	318	switch (res) {
	319	case 0:
	320	/* Success! */
37ea4f91	321	authenticated = authctxt->valid ? 1 : 0;
5ba55ada	322	break;
	323	case 1:
	324	/* Authentication needs further interaction */
2f293d43	325	if (send_userauth_info_request(authctxt) == 1)
2f293d43	326	authctxt->postponed = 1;
5ba55ada	327	break;
	328	default:
	329	/* Failure! */
	330	break;
59c97189	331	}
5ba55ada	332
7efff8ce	333	xasprintf(&method, "keyboard-interactive/%s", kbdintctxt->device->name);
5ba55ada	334
5ba55ada	335	if (!authctxt->postponed) {
5ba55ada	336	if (authenticated) {
2f293d43	337	auth2_challenge_stop(authctxt);
5ba55ada	338	} else {
	339	/* start next device */
	340	/* may set authctxt->postponed */
	341	auth2_challenge_start(authctxt);
	342	}
	343	}
d9cd3575	344	userauth_finish(authctxt, authenticated, method);
5ba55ada	345	xfree(method);
59c97189	346	}
1853d1ef	347
	348	void
	349	privsep_challenge_enable(void)
	350	{
4881aebb	351	#if defined(BSD_AUTH) \|\| defined(USE_PAM) \|\| defined(SKEY)
	352	int n = 0;
	353	#endif
1853d1ef	354	#ifdef BSD_AUTH
	355	extern KbdintDevice mm_bsdauth_device;
	356	#endif
05114c74	357	#ifdef USE_PAM
	358	extern KbdintDevice mm_sshpam_device;
	359	#endif
1853d1ef	360	#ifdef SKEY
	361	extern KbdintDevice mm_skey_device;
	362	#endif
05114c74	363
1853d1ef	364	#ifdef BSD_AUTH
05114c74	365	devices[n++] = &mm_bsdauth_device;
1853d1ef	366	#else
05114c74	367	#ifdef USE_PAM
	368	devices[n++] = &mm_sshpam_device;
	369	#endif
1853d1ef	370	#ifdef SKEY
05114c74	371	devices[n++] = &mm_skey_device;
1853d1ef	372	#endif
	373	#endif
	374	}