[openssh.git] / auth2-chall.c

/* $OpenBSD: auth2-chall.c,v 1.28 2006/07/22 20:48:22 stevesk 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 <string.h>

#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;
	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, len;
	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;
	}

	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
00146caa	1	/* $OpenBSD: auth2-chall.c,v 1.28 2006/07/22 20:48:22 stevesk 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	*/
	26	#include "includes.h"
59c97189	27
00146caa	28	#include <string.h>
00146caa	29
59c97189	30	#include "ssh2.h"
59c97189	31	#include "auth.h"
3469eac4	32	#include "buffer.h"
59c97189	33	#include "packet.h"
	34	#include "xmalloc.h"
	35	#include "dispatch.h"
42f11eb2	36	#include "log.h"
c384a74c	37	#include "servconf.h"
	38
	39	/* import */
	40	extern ServerOptions options;
59c97189	41
396c147e	42	static int auth2_challenge_start(Authctxt *);
396c147e	43	static int send_userauth_info_request(Authctxt *);
7819b5c3	44	static void input_userauth_info_response(int, u_int32_t, void *);
5ba55ada	45
	46	#ifdef BSD_AUTH
	47	extern KbdintDevice bsdauth_device;
	48	#else
05114c74	49	#ifdef USE_PAM
	50	extern KbdintDevice sshpam_device;
	51	#endif
5ba55ada	52	#ifdef SKEY
	53	extern KbdintDevice skey_device;
	54	#endif
	55	#endif
	56
	57	KbdintDevice *devices[] = {
	58	#ifdef BSD_AUTH
	59	&bsdauth_device,
	60	#else
05114c74	61	#ifdef USE_PAM
	62	&sshpam_device,
	63	#endif
5ba55ada	64	#ifdef SKEY
	65	&skey_device,
	66	#endif
	67	#endif
	68	NULL
	69	};
	70
	71	typedef struct KbdintAuthctxt KbdintAuthctxt;
	72	struct KbdintAuthctxt
	73	{
	74	char *devices;
	75	void *ctxt;
	76	KbdintDevice *device;
477edc5d	77	u_int nreq;
5ba55ada	78	};
5ba55ada	79
c384a74c	80	#ifdef USE_PAM
	81	void
	82	remove_kbdint_device(const char *devname)
	83	{
	84	int i, j;
	85
	86	for (i = 0; devices[i] != NULL; i++)
	87	if (strcmp(devices[i]->name, devname) == 0) {
	88	for (j = i; devices[j] != NULL; j++)
	89	devices[j] = devices[j+1];
	90	i--;
	91	}
	92	}
	93	#endif
	94
396c147e	95	static KbdintAuthctxt *
5ba55ada	96	kbdint_alloc(const char *devs)
	97	{
	98	KbdintAuthctxt *kbdintctxt;
3469eac4	99	Buffer b;
5ba55ada	100	int i;
5ba55ada	101
c384a74c	102	#ifdef USE_PAM
	103	if (!options.use_pam)
	104	remove_kbdint_device("pam");
	105	#endif
	106
5ba55ada	107	kbdintctxt = xmalloc(sizeof(KbdintAuthctxt));
5ba55ada	108	if (strcmp(devs, "") == 0) {
3469eac4	109	buffer_init(&b);
5ba55ada	110	for (i = 0; devices[i]; i++) {
3469eac4	111	if (buffer_len(&b) > 0)
	112	buffer_append(&b, ",", 1);
	113	buffer_append(&b, devices[i]->name,
	114	strlen(devices[i]->name));
5ba55ada	115	}
3469eac4	116	buffer_append(&b, "\0", 1);
	117	kbdintctxt->devices = xstrdup(buffer_ptr(&b));
	118	buffer_free(&b);
5ba55ada	119	} else {
	120	kbdintctxt->devices = xstrdup(devs);
	121	}
3469eac4	122	debug("kbdint_alloc: devices '%s'", kbdintctxt->devices);
5ba55ada	123	kbdintctxt->ctxt = NULL;
5ba55ada	124	kbdintctxt->device = NULL;
477edc5d	125	kbdintctxt->nreq = 0;
5ba55ada	126
	127	return kbdintctxt;
	128	}
396c147e	129	static void
5ba55ada	130	kbdint_reset_device(KbdintAuthctxt *kbdintctxt)
	131	{
	132	if (kbdintctxt->ctxt) {
	133	kbdintctxt->device->free_ctx(kbdintctxt->ctxt);
	134	kbdintctxt->ctxt = NULL;
	135	}
	136	kbdintctxt->device = NULL;
	137	}
396c147e	138	static void
5ba55ada	139	kbdint_free(KbdintAuthctxt *kbdintctxt)
	140	{
	141	if (kbdintctxt->device)
	142	kbdint_reset_device(kbdintctxt);
	143	if (kbdintctxt->devices) {
	144	xfree(kbdintctxt->devices);
	145	kbdintctxt->devices = NULL;
	146	}
	147	xfree(kbdintctxt);
	148	}
	149	/* get next device */
396c147e	150	static int
5ba55ada	151	kbdint_next_device(KbdintAuthctxt *kbdintctxt)
	152	{
	153	size_t len;
	154	char *t;
	155	int i;
	156
	157	if (kbdintctxt->device)
	158	kbdint_reset_device(kbdintctxt);
	159	do {
	160	len = kbdintctxt->devices ?
	161	strcspn(kbdintctxt->devices, ",") : 0;
	162
	163	if (len == 0)
	164	break;
	165	for (i = 0; devices[i]; i++)
	166	if (strncmp(kbdintctxt->devices, devices[i]->name, len) == 0)
	167	kbdintctxt->device = devices[i];
	168	t = kbdintctxt->devices;
	169	kbdintctxt->devices = t[len] ? xstrdup(t+len+1) : NULL;
	170	xfree(t);
	171	debug2("kbdint_next_device: devices %s", kbdintctxt->devices ?
4e2e5cfd	172	kbdintctxt->devices : "<empty>");
5ba55ada	173	} while (kbdintctxt->devices && !kbdintctxt->device);
	174
	175	return kbdintctxt->device ? 1 : 0;
	176	}
59c97189	177
59c97189	178	/*
aa8003d6	179	* try challenge-response, set authctxt->postponed if we have to
59c97189	180	* wait for the response.
	181	*/
	182	int
	183	auth2_challenge(Authctxt authctxt, char devs)
	184	{
5ba55ada	185	debug("auth2_challenge: user=%s devs=%s",
	186	authctxt->user ? authctxt->user : "<nouser>",
	187	devs ? devs : "<no devs>");
	188
f5e69c65	189	if (authctxt->user == NULL \|\| !devs)
5ba55ada	190	return 0;
184eed6a	191	if (authctxt->kbdintctxt == NULL)
5ba55ada	192	authctxt->kbdintctxt = kbdint_alloc(devs);
	193	return auth2_challenge_start(authctxt);
	194	}
	195
2f293d43	196	/* unregister kbd-int callbacks and context */
	197	void
	198	auth2_challenge_stop(Authctxt *authctxt)
	199	{
	200	/* unregister callback */
	201	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
	202	if (authctxt->kbdintctxt != NULL) {
	203	kbdint_free(authctxt->kbdintctxt);
	204	authctxt->kbdintctxt = NULL;
	205	}
	206	}
	207
5ba55ada	208	/* side effect: sets authctxt->postponed if a reply was sent*/
	209	static int
	210	auth2_challenge_start(Authctxt *authctxt)
	211	{
	212	KbdintAuthctxt *kbdintctxt = authctxt->kbdintctxt;
	213
	214	debug2("auth2_challenge_start: devices %s",
	215	kbdintctxt->devices ? kbdintctxt->devices : "<empty>");
	216
	217	if (kbdint_next_device(kbdintctxt) == 0) {
2f293d43	218	auth2_challenge_stop(authctxt);
5ba55ada	219	return 0;
	220	}
	221	debug("auth2_challenge_start: trying authentication method '%s'",
	222	kbdintctxt->device->name);
59c97189	223
5ba55ada	224	if ((kbdintctxt->ctxt = kbdintctxt->device->init_ctx(authctxt)) == NULL) {
2f293d43	225	auth2_challenge_stop(authctxt);
59c97189	226	return 0;
5ba55ada	227	}
5ba55ada	228	if (send_userauth_info_request(authctxt) == 0) {
2f293d43	229	auth2_challenge_stop(authctxt);
59c97189	230	return 0;
5ba55ada	231	}
59c97189	232	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
59c97189	233	&input_userauth_info_response);
5ba55ada	234
59c97189	235	authctxt->postponed = 1;
	236	return 0;
	237	}
	238
5ba55ada	239	static int
5ba55ada	240	send_userauth_info_request(Authctxt *authctxt)
59c97189	241	{
5ba55ada	242	KbdintAuthctxt *kbdintctxt;
5ba55ada	243	char name, instr, **prompts;
2ceb8101	244	u_int i, *echo_on;
5ba55ada	245
	246	kbdintctxt = authctxt->kbdintctxt;
	247	if (kbdintctxt->device->query(kbdintctxt->ctxt,
477edc5d	248	&name, &instr, &kbdintctxt->nreq, &prompts, &echo_on))
5ba55ada	249	return 0;
59c97189	250
59c97189	251	packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
5ba55ada	252	packet_put_cstring(name);
5ba55ada	253	packet_put_cstring(instr);
7203d6bb	254	packet_put_cstring(""); /* language not used */
477edc5d	255	packet_put_int(kbdintctxt->nreq);
477edc5d	256	for (i = 0; i < kbdintctxt->nreq; i++) {
5ba55ada	257	packet_put_cstring(prompts[i]);
	258	packet_put_char(echo_on[i]);
	259	}
59c97189	260	packet_send();
59c97189	261	packet_write_wait();
5ba55ada	262
477edc5d	263	for (i = 0; i < kbdintctxt->nreq; i++)
5ba55ada	264	xfree(prompts[i]);
	265	xfree(prompts);
	266	xfree(echo_on);
	267	xfree(name);
	268	xfree(instr);
	269	return 1;
59c97189	270	}
59c97189	271
5ba55ada	272	static void
7819b5c3	273	input_userauth_info_response(int type, u_int32_t seq, void *ctxt)
59c97189	274	{
59c97189	275	Authctxt *authctxt = ctxt;
5ba55ada	276	KbdintAuthctxt *kbdintctxt;
2ceb8101	277	int authenticated = 0, res, len;
2ceb8101	278	u_int i, nresp;
5ba55ada	279	char *response = NULL, method;
59c97189	280
	281	if (authctxt == NULL)
	282	fatal("input_userauth_info_response: no authctxt");
5ba55ada	283	kbdintctxt = authctxt->kbdintctxt;
	284	if (kbdintctxt == NULL \|\| kbdintctxt->ctxt == NULL)
	285	fatal("input_userauth_info_response: no kbdintctxt");
	286	if (kbdintctxt->device == NULL)
	287	fatal("input_userauth_info_response: no device");
59c97189	288
	289	authctxt->postponed = 0; /* reset */
	290	nresp = packet_get_int();
477edc5d	291	if (nresp != kbdintctxt->nreq)
	292	fatal("input_userauth_info_response: wrong number of replies");
	293	if (nresp > 100)
	294	fatal("input_userauth_info_response: too many replies");
5ba55ada	295	if (nresp > 0) {
52e3daed	296	response = xcalloc(nresp, sizeof(char *));
5ba55ada	297	for (i = 0; i < nresp; i++)
	298	response[i] = packet_get_string(NULL);
	299	}
95500969	300	packet_check_eom();
5ba55ada	301
37ea4f91	302	res = kbdintctxt->device->respond(kbdintctxt->ctxt, nresp, response);
5ba55ada	303
	304	for (i = 0; i < nresp; i++) {
	305	memset(response[i], 'r', strlen(response[i]));
	306	xfree(response[i]);
	307	}
	308	if (response)
59c97189	309	xfree(response);
5ba55ada	310
	311	switch (res) {
	312	case 0:
	313	/* Success! */
37ea4f91	314	authenticated = authctxt->valid ? 1 : 0;
5ba55ada	315	break;
	316	case 1:
	317	/* Authentication needs further interaction */
2f293d43	318	if (send_userauth_info_request(authctxt) == 1)
2f293d43	319	authctxt->postponed = 1;
5ba55ada	320	break;
	321	default:
	322	/* Failure! */
	323	break;
59c97189	324	}
5ba55ada	325
	326	len = strlen("keyboard-interactive") + 2 +
	327	strlen(kbdintctxt->device->name);
	328	method = xmalloc(len);
bd2d2ac4	329	snprintf(method, len, "keyboard-interactive/%s",
bd2d2ac4	330	kbdintctxt->device->name);
5ba55ada	331
5ba55ada	332	if (!authctxt->postponed) {
5ba55ada	333	if (authenticated) {
2f293d43	334	auth2_challenge_stop(authctxt);
5ba55ada	335	} else {
	336	/* start next device */
	337	/* may set authctxt->postponed */
	338	auth2_challenge_start(authctxt);
	339	}
	340	}
d9cd3575	341	userauth_finish(authctxt, authenticated, method);
5ba55ada	342	xfree(method);
59c97189	343	}
1853d1ef	344
	345	void
	346	privsep_challenge_enable(void)
	347	{
4881aebb	348	#if defined(BSD_AUTH) \|\| defined(USE_PAM) \|\| defined(SKEY)
	349	int n = 0;
	350	#endif
1853d1ef	351	#ifdef BSD_AUTH
	352	extern KbdintDevice mm_bsdauth_device;
	353	#endif
05114c74	354	#ifdef USE_PAM
	355	extern KbdintDevice mm_sshpam_device;
	356	#endif
1853d1ef	357	#ifdef SKEY
	358	extern KbdintDevice mm_skey_device;
	359	#endif
05114c74	360
1853d1ef	361	#ifdef BSD_AUTH
05114c74	362	devices[n++] = &mm_bsdauth_device;
1853d1ef	363	#else
05114c74	364	#ifdef USE_PAM
	365	devices[n++] = &mm_sshpam_device;
	366	#endif
1853d1ef	367	#ifdef SKEY
05114c74	368	devices[n++] = &mm_skey_device;
1853d1ef	369	#endif
	370	#endif
	371	}