[openssh.git] / auth2-chall.c

/* $OpenBSD: auth2-chall.c,v 1.29 2006/08/01 23:22:47 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 <stdio.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
cf851879	1	/* $OpenBSD: auth2-chall.c,v 1.29 2006/08/01 23:22:47 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
cf851879	28	#include <stdio.h>
00146caa	29	#include <string.h>
00146caa	30
59c97189	31	#include "ssh2.h"
59c97189	32	#include "auth.h"
3469eac4	33	#include "buffer.h"
59c97189	34	#include "packet.h"
	35	#include "xmalloc.h"
	36	#include "dispatch.h"
42f11eb2	37	#include "log.h"
c384a74c	38	#include "servconf.h"
	39
	40	/* import */
	41	extern ServerOptions options;
59c97189	42
396c147e	43	static int auth2_challenge_start(Authctxt *);
396c147e	44	static int send_userauth_info_request(Authctxt *);
7819b5c3	45	static void input_userauth_info_response(int, u_int32_t, void *);
5ba55ada	46
	47	#ifdef BSD_AUTH
	48	extern KbdintDevice bsdauth_device;
	49	#else
05114c74	50	#ifdef USE_PAM
	51	extern KbdintDevice sshpam_device;
	52	#endif
5ba55ada	53	#ifdef SKEY
	54	extern KbdintDevice skey_device;
	55	#endif
	56	#endif
	57
	58	KbdintDevice *devices[] = {
	59	#ifdef BSD_AUTH
	60	&bsdauth_device,
	61	#else
05114c74	62	#ifdef USE_PAM
	63	&sshpam_device,
	64	#endif
5ba55ada	65	#ifdef SKEY
	66	&skey_device,
	67	#endif
	68	#endif
	69	NULL
	70	};
	71
	72	typedef struct KbdintAuthctxt KbdintAuthctxt;
	73	struct KbdintAuthctxt
	74	{
	75	char *devices;
	76	void *ctxt;
	77	KbdintDevice *device;
477edc5d	78	u_int nreq;
5ba55ada	79	};
5ba55ada	80
c384a74c	81	#ifdef USE_PAM
	82	void
	83	remove_kbdint_device(const char *devname)
	84	{
	85	int i, j;
	86
	87	for (i = 0; devices[i] != NULL; i++)
	88	if (strcmp(devices[i]->name, devname) == 0) {
	89	for (j = i; devices[j] != NULL; j++)
	90	devices[j] = devices[j+1];
	91	i--;
	92	}
	93	}
	94	#endif
	95
396c147e	96	static KbdintAuthctxt *
5ba55ada	97	kbdint_alloc(const char *devs)
	98	{
	99	KbdintAuthctxt *kbdintctxt;
3469eac4	100	Buffer b;
5ba55ada	101	int i;
5ba55ada	102
c384a74c	103	#ifdef USE_PAM
	104	if (!options.use_pam)
	105	remove_kbdint_device("pam");
	106	#endif
	107
5ba55ada	108	kbdintctxt = xmalloc(sizeof(KbdintAuthctxt));
5ba55ada	109	if (strcmp(devs, "") == 0) {
3469eac4	110	buffer_init(&b);
5ba55ada	111	for (i = 0; devices[i]; i++) {
3469eac4	112	if (buffer_len(&b) > 0)
	113	buffer_append(&b, ",", 1);
	114	buffer_append(&b, devices[i]->name,
	115	strlen(devices[i]->name));
5ba55ada	116	}
3469eac4	117	buffer_append(&b, "\0", 1);
	118	kbdintctxt->devices = xstrdup(buffer_ptr(&b));
	119	buffer_free(&b);
5ba55ada	120	} else {
	121	kbdintctxt->devices = xstrdup(devs);
	122	}
3469eac4	123	debug("kbdint_alloc: devices '%s'", kbdintctxt->devices);
5ba55ada	124	kbdintctxt->ctxt = NULL;
5ba55ada	125	kbdintctxt->device = NULL;
477edc5d	126	kbdintctxt->nreq = 0;
5ba55ada	127
	128	return kbdintctxt;
	129	}
396c147e	130	static void
5ba55ada	131	kbdint_reset_device(KbdintAuthctxt *kbdintctxt)
	132	{
	133	if (kbdintctxt->ctxt) {
	134	kbdintctxt->device->free_ctx(kbdintctxt->ctxt);
	135	kbdintctxt->ctxt = NULL;
	136	}
	137	kbdintctxt->device = NULL;
	138	}
396c147e	139	static void
5ba55ada	140	kbdint_free(KbdintAuthctxt *kbdintctxt)
	141	{
	142	if (kbdintctxt->device)
	143	kbdint_reset_device(kbdintctxt);
	144	if (kbdintctxt->devices) {
	145	xfree(kbdintctxt->devices);
	146	kbdintctxt->devices = NULL;
	147	}
	148	xfree(kbdintctxt);
	149	}
	150	/* get next device */
396c147e	151	static int
5ba55ada	152	kbdint_next_device(KbdintAuthctxt *kbdintctxt)
	153	{
	154	size_t len;
	155	char *t;
	156	int i;
	157
	158	if (kbdintctxt->device)
	159	kbdint_reset_device(kbdintctxt);
	160	do {
	161	len = kbdintctxt->devices ?
	162	strcspn(kbdintctxt->devices, ",") : 0;
	163
	164	if (len == 0)
	165	break;
	166	for (i = 0; devices[i]; i++)
	167	if (strncmp(kbdintctxt->devices, devices[i]->name, len) == 0)
	168	kbdintctxt->device = devices[i];
	169	t = kbdintctxt->devices;
	170	kbdintctxt->devices = t[len] ? xstrdup(t+len+1) : NULL;
	171	xfree(t);
	172	debug2("kbdint_next_device: devices %s", kbdintctxt->devices ?
4e2e5cfd	173	kbdintctxt->devices : "<empty>");
5ba55ada	174	} while (kbdintctxt->devices && !kbdintctxt->device);
	175
	176	return kbdintctxt->device ? 1 : 0;
	177	}
59c97189	178
59c97189	179	/*
aa8003d6	180	* try challenge-response, set authctxt->postponed if we have to
59c97189	181	* wait for the response.
	182	*/
	183	int
	184	auth2_challenge(Authctxt authctxt, char devs)
	185	{
5ba55ada	186	debug("auth2_challenge: user=%s devs=%s",
	187	authctxt->user ? authctxt->user : "<nouser>",
	188	devs ? devs : "<no devs>");
	189
f5e69c65	190	if (authctxt->user == NULL \|\| !devs)
5ba55ada	191	return 0;
184eed6a	192	if (authctxt->kbdintctxt == NULL)
5ba55ada	193	authctxt->kbdintctxt = kbdint_alloc(devs);
	194	return auth2_challenge_start(authctxt);
	195	}
	196
2f293d43	197	/* unregister kbd-int callbacks and context */
	198	void
	199	auth2_challenge_stop(Authctxt *authctxt)
	200	{
	201	/* unregister callback */
	202	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
	203	if (authctxt->kbdintctxt != NULL) {
	204	kbdint_free(authctxt->kbdintctxt);
	205	authctxt->kbdintctxt = NULL;
	206	}
	207	}
	208
5ba55ada	209	/* side effect: sets authctxt->postponed if a reply was sent*/
	210	static int
	211	auth2_challenge_start(Authctxt *authctxt)
	212	{
	213	KbdintAuthctxt *kbdintctxt = authctxt->kbdintctxt;
	214
	215	debug2("auth2_challenge_start: devices %s",
	216	kbdintctxt->devices ? kbdintctxt->devices : "<empty>");
	217
	218	if (kbdint_next_device(kbdintctxt) == 0) {
2f293d43	219	auth2_challenge_stop(authctxt);
5ba55ada	220	return 0;
	221	}
	222	debug("auth2_challenge_start: trying authentication method '%s'",
	223	kbdintctxt->device->name);
59c97189	224
5ba55ada	225	if ((kbdintctxt->ctxt = kbdintctxt->device->init_ctx(authctxt)) == NULL) {
2f293d43	226	auth2_challenge_stop(authctxt);
59c97189	227	return 0;
5ba55ada	228	}
5ba55ada	229	if (send_userauth_info_request(authctxt) == 0) {
2f293d43	230	auth2_challenge_stop(authctxt);
59c97189	231	return 0;
5ba55ada	232	}
59c97189	233	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
59c97189	234	&input_userauth_info_response);
5ba55ada	235
59c97189	236	authctxt->postponed = 1;
	237	return 0;
	238	}
	239
5ba55ada	240	static int
5ba55ada	241	send_userauth_info_request(Authctxt *authctxt)
59c97189	242	{
5ba55ada	243	KbdintAuthctxt *kbdintctxt;
5ba55ada	244	char name, instr, **prompts;
2ceb8101	245	u_int i, *echo_on;
5ba55ada	246
	247	kbdintctxt = authctxt->kbdintctxt;
	248	if (kbdintctxt->device->query(kbdintctxt->ctxt,
477edc5d	249	&name, &instr, &kbdintctxt->nreq, &prompts, &echo_on))
5ba55ada	250	return 0;
59c97189	251
59c97189	252	packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
5ba55ada	253	packet_put_cstring(name);
5ba55ada	254	packet_put_cstring(instr);
7203d6bb	255	packet_put_cstring(""); /* language not used */
477edc5d	256	packet_put_int(kbdintctxt->nreq);
477edc5d	257	for (i = 0; i < kbdintctxt->nreq; i++) {
5ba55ada	258	packet_put_cstring(prompts[i]);
	259	packet_put_char(echo_on[i]);
	260	}
59c97189	261	packet_send();
59c97189	262	packet_write_wait();
5ba55ada	263
477edc5d	264	for (i = 0; i < kbdintctxt->nreq; i++)
5ba55ada	265	xfree(prompts[i]);
	266	xfree(prompts);
	267	xfree(echo_on);
	268	xfree(name);
	269	xfree(instr);
	270	return 1;
59c97189	271	}
59c97189	272
5ba55ada	273	static void
7819b5c3	274	input_userauth_info_response(int type, u_int32_t seq, void *ctxt)
59c97189	275	{
59c97189	276	Authctxt *authctxt = ctxt;
5ba55ada	277	KbdintAuthctxt *kbdintctxt;
2ceb8101	278	int authenticated = 0, res, len;
2ceb8101	279	u_int i, nresp;
5ba55ada	280	char *response = NULL, method;
59c97189	281
	282	if (authctxt == NULL)
	283	fatal("input_userauth_info_response: no authctxt");
5ba55ada	284	kbdintctxt = authctxt->kbdintctxt;
	285	if (kbdintctxt == NULL \|\| kbdintctxt->ctxt == NULL)
	286	fatal("input_userauth_info_response: no kbdintctxt");
	287	if (kbdintctxt->device == NULL)
	288	fatal("input_userauth_info_response: no device");
59c97189	289
	290	authctxt->postponed = 0; /* reset */
	291	nresp = packet_get_int();
477edc5d	292	if (nresp != kbdintctxt->nreq)
	293	fatal("input_userauth_info_response: wrong number of replies");
	294	if (nresp > 100)
	295	fatal("input_userauth_info_response: too many replies");
5ba55ada	296	if (nresp > 0) {
52e3daed	297	response = xcalloc(nresp, sizeof(char *));
5ba55ada	298	for (i = 0; i < nresp; i++)
	299	response[i] = packet_get_string(NULL);
	300	}
95500969	301	packet_check_eom();
5ba55ada	302
37ea4f91	303	res = kbdintctxt->device->respond(kbdintctxt->ctxt, nresp, response);
5ba55ada	304
	305	for (i = 0; i < nresp; i++) {
	306	memset(response[i], 'r', strlen(response[i]));
	307	xfree(response[i]);
	308	}
	309	if (response)
59c97189	310	xfree(response);
5ba55ada	311
	312	switch (res) {
	313	case 0:
	314	/* Success! */
37ea4f91	315	authenticated = authctxt->valid ? 1 : 0;
5ba55ada	316	break;
	317	case 1:
	318	/* Authentication needs further interaction */
2f293d43	319	if (send_userauth_info_request(authctxt) == 1)
2f293d43	320	authctxt->postponed = 1;
5ba55ada	321	break;
	322	default:
	323	/* Failure! */
	324	break;
59c97189	325	}
5ba55ada	326
	327	len = strlen("keyboard-interactive") + 2 +
	328	strlen(kbdintctxt->device->name);
	329	method = xmalloc(len);
bd2d2ac4	330	snprintf(method, len, "keyboard-interactive/%s",
bd2d2ac4	331	kbdintctxt->device->name);
5ba55ada	332
5ba55ada	333	if (!authctxt->postponed) {
5ba55ada	334	if (authenticated) {
2f293d43	335	auth2_challenge_stop(authctxt);
5ba55ada	336	} else {
	337	/* start next device */
	338	/* may set authctxt->postponed */
	339	auth2_challenge_start(authctxt);
	340	}
	341	}
d9cd3575	342	userauth_finish(authctxt, authenticated, method);
5ba55ada	343	xfree(method);
59c97189	344	}
1853d1ef	345
	346	void
	347	privsep_challenge_enable(void)
	348	{
4881aebb	349	#if defined(BSD_AUTH) \|\| defined(USE_PAM) \|\| defined(SKEY)
	350	int n = 0;
	351	#endif
1853d1ef	352	#ifdef BSD_AUTH
	353	extern KbdintDevice mm_bsdauth_device;
	354	#endif
05114c74	355	#ifdef USE_PAM
	356	extern KbdintDevice mm_sshpam_device;
	357	#endif
1853d1ef	358	#ifdef SKEY
	359	extern KbdintDevice mm_skey_device;
	360	#endif
05114c74	361
1853d1ef	362	#ifdef BSD_AUTH
05114c74	363	devices[n++] = &mm_bsdauth_device;
1853d1ef	364	#else
05114c74	365	#ifdef USE_PAM
	366	devices[n++] = &mm_sshpam_device;
	367	#endif
1853d1ef	368	#ifdef SKEY
05114c74	369	devices[n++] = &mm_skey_device;
1853d1ef	370	#endif
	371	#endif
	372	}