[openssh.git] / 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"

#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
59c97189	1	/*
f3c7c613	2	* Copyright (c) 2001 Markus Friedl. All rights reserved.
5ba55ada	3	* Copyright (c) 2001 Per Allansson. All rights reserved.
59c97189	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"
59c97189	26
59c97189	27	#include "ssh2.h"
59c97189	28	#include "auth.h"
3469eac4	29	#include "buffer.h"
59c97189	30	#include "packet.h"
	31	#include "xmalloc.h"
	32	#include "dispatch.h"
42f11eb2	33	#include "log.h"
c384a74c	34	#include "servconf.h"
	35
	36	/* import */
	37	extern ServerOptions options;
59c97189	38
396c147e	39	static int auth2_challenge_start(Authctxt *);
396c147e	40	static int send_userauth_info_request(Authctxt *);
7819b5c3	41	static void input_userauth_info_response(int, u_int32_t, void *);
5ba55ada	42
	43	#ifdef BSD_AUTH
	44	extern KbdintDevice bsdauth_device;
	45	#else
05114c74	46	#ifdef USE_PAM
	47	extern KbdintDevice sshpam_device;
	48	#endif
5ba55ada	49	#ifdef SKEY
	50	extern KbdintDevice skey_device;
	51	#endif
	52	#endif
	53
	54	KbdintDevice *devices[] = {
	55	#ifdef BSD_AUTH
	56	&bsdauth_device,
	57	#else
05114c74	58	#ifdef USE_PAM
	59	&sshpam_device,
	60	#endif
5ba55ada	61	#ifdef SKEY
	62	&skey_device,
	63	#endif
	64	#endif
	65	NULL
	66	};
	67
	68	typedef struct KbdintAuthctxt KbdintAuthctxt;
	69	struct KbdintAuthctxt
	70	{
	71	char *devices;
	72	void *ctxt;
	73	KbdintDevice *device;
477edc5d	74	u_int nreq;
5ba55ada	75	};
5ba55ada	76
c384a74c	77	#ifdef USE_PAM
	78	void
	79	remove_kbdint_device(const char *devname)
	80	{
	81	int i, j;
	82
	83	for (i = 0; devices[i] != NULL; i++)
	84	if (strcmp(devices[i]->name, devname) == 0) {
	85	for (j = i; devices[j] != NULL; j++)
	86	devices[j] = devices[j+1];
	87	i--;
	88	}
	89	}
	90	#endif
	91
396c147e	92	static KbdintAuthctxt *
5ba55ada	93	kbdint_alloc(const char *devs)
	94	{
	95	KbdintAuthctxt *kbdintctxt;
3469eac4	96	Buffer b;
5ba55ada	97	int i;
5ba55ada	98
c384a74c	99	#ifdef USE_PAM
	100	if (!options.use_pam)
	101	remove_kbdint_device("pam");
	102	#endif
	103
5ba55ada	104	kbdintctxt = xmalloc(sizeof(KbdintAuthctxt));
5ba55ada	105	if (strcmp(devs, "") == 0) {
3469eac4	106	buffer_init(&b);
5ba55ada	107	for (i = 0; devices[i]; i++) {
3469eac4	108	if (buffer_len(&b) > 0)
	109	buffer_append(&b, ",", 1);
	110	buffer_append(&b, devices[i]->name,
	111	strlen(devices[i]->name));
5ba55ada	112	}
3469eac4	113	buffer_append(&b, "\0", 1);
	114	kbdintctxt->devices = xstrdup(buffer_ptr(&b));
	115	buffer_free(&b);
5ba55ada	116	} else {
	117	kbdintctxt->devices = xstrdup(devs);
	118	}
3469eac4	119	debug("kbdint_alloc: devices '%s'", kbdintctxt->devices);
5ba55ada	120	kbdintctxt->ctxt = NULL;
5ba55ada	121	kbdintctxt->device = NULL;
477edc5d	122	kbdintctxt->nreq = 0;
5ba55ada	123
	124	return kbdintctxt;
	125	}
396c147e	126	static void
5ba55ada	127	kbdint_reset_device(KbdintAuthctxt *kbdintctxt)
	128	{
	129	if (kbdintctxt->ctxt) {
	130	kbdintctxt->device->free_ctx(kbdintctxt->ctxt);
	131	kbdintctxt->ctxt = NULL;
	132	}
	133	kbdintctxt->device = NULL;
	134	}
396c147e	135	static void
5ba55ada	136	kbdint_free(KbdintAuthctxt *kbdintctxt)
	137	{
	138	if (kbdintctxt->device)
	139	kbdint_reset_device(kbdintctxt);
	140	if (kbdintctxt->devices) {
	141	xfree(kbdintctxt->devices);
	142	kbdintctxt->devices = NULL;
	143	}
	144	xfree(kbdintctxt);
	145	}
	146	/* get next device */
396c147e	147	static int
5ba55ada	148	kbdint_next_device(KbdintAuthctxt *kbdintctxt)
	149	{
	150	size_t len;
	151	char *t;
	152	int i;
	153
	154	if (kbdintctxt->device)
	155	kbdint_reset_device(kbdintctxt);
	156	do {
	157	len = kbdintctxt->devices ?
	158	strcspn(kbdintctxt->devices, ",") : 0;
	159
	160	if (len == 0)
	161	break;
	162	for (i = 0; devices[i]; i++)
	163	if (strncmp(kbdintctxt->devices, devices[i]->name, len) == 0)
	164	kbdintctxt->device = devices[i];
	165	t = kbdintctxt->devices;
	166	kbdintctxt->devices = t[len] ? xstrdup(t+len+1) : NULL;
	167	xfree(t);
	168	debug2("kbdint_next_device: devices %s", kbdintctxt->devices ?
4e2e5cfd	169	kbdintctxt->devices : "<empty>");
5ba55ada	170	} while (kbdintctxt->devices && !kbdintctxt->device);
	171
	172	return kbdintctxt->device ? 1 : 0;
	173	}
59c97189	174
59c97189	175	/*
aa8003d6	176	* try challenge-response, set authctxt->postponed if we have to
59c97189	177	* wait for the response.
	178	*/
	179	int
	180	auth2_challenge(Authctxt authctxt, char devs)
	181	{
5ba55ada	182	debug("auth2_challenge: user=%s devs=%s",
	183	authctxt->user ? authctxt->user : "<nouser>",
	184	devs ? devs : "<no devs>");
	185
f5e69c65	186	if (authctxt->user == NULL \|\| !devs)
5ba55ada	187	return 0;
184eed6a	188	if (authctxt->kbdintctxt == NULL)
5ba55ada	189	authctxt->kbdintctxt = kbdint_alloc(devs);
	190	return auth2_challenge_start(authctxt);
	191	}
	192
2f293d43	193	/* unregister kbd-int callbacks and context */
	194	void
	195	auth2_challenge_stop(Authctxt *authctxt)
	196	{
	197	/* unregister callback */
	198	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
	199	if (authctxt->kbdintctxt != NULL) {
	200	kbdint_free(authctxt->kbdintctxt);
	201	authctxt->kbdintctxt = NULL;
	202	}
	203	}
	204
5ba55ada	205	/* side effect: sets authctxt->postponed if a reply was sent*/
	206	static int
	207	auth2_challenge_start(Authctxt *authctxt)
	208	{
	209	KbdintAuthctxt *kbdintctxt = authctxt->kbdintctxt;
	210
	211	debug2("auth2_challenge_start: devices %s",
	212	kbdintctxt->devices ? kbdintctxt->devices : "<empty>");
	213
	214	if (kbdint_next_device(kbdintctxt) == 0) {
2f293d43	215	auth2_challenge_stop(authctxt);
5ba55ada	216	return 0;
	217	}
	218	debug("auth2_challenge_start: trying authentication method '%s'",
	219	kbdintctxt->device->name);
59c97189	220
5ba55ada	221	if ((kbdintctxt->ctxt = kbdintctxt->device->init_ctx(authctxt)) == NULL) {
2f293d43	222	auth2_challenge_stop(authctxt);
59c97189	223	return 0;
5ba55ada	224	}
5ba55ada	225	if (send_userauth_info_request(authctxt) == 0) {
2f293d43	226	auth2_challenge_stop(authctxt);
59c97189	227	return 0;
5ba55ada	228	}
59c97189	229	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
59c97189	230	&input_userauth_info_response);
5ba55ada	231
59c97189	232	authctxt->postponed = 1;
	233	return 0;
	234	}
	235
5ba55ada	236	static int
5ba55ada	237	send_userauth_info_request(Authctxt *authctxt)
59c97189	238	{
5ba55ada	239	KbdintAuthctxt *kbdintctxt;
5ba55ada	240	char name, instr, **prompts;
2ceb8101	241	u_int i, *echo_on;
5ba55ada	242
	243	kbdintctxt = authctxt->kbdintctxt;
	244	if (kbdintctxt->device->query(kbdintctxt->ctxt,
477edc5d	245	&name, &instr, &kbdintctxt->nreq, &prompts, &echo_on))
5ba55ada	246	return 0;
59c97189	247
59c97189	248	packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
5ba55ada	249	packet_put_cstring(name);
5ba55ada	250	packet_put_cstring(instr);
7203d6bb	251	packet_put_cstring(""); /* language not used */
477edc5d	252	packet_put_int(kbdintctxt->nreq);
477edc5d	253	for (i = 0; i < kbdintctxt->nreq; i++) {
5ba55ada	254	packet_put_cstring(prompts[i]);
	255	packet_put_char(echo_on[i]);
	256	}
59c97189	257	packet_send();
59c97189	258	packet_write_wait();
5ba55ada	259
477edc5d	260	for (i = 0; i < kbdintctxt->nreq; i++)
5ba55ada	261	xfree(prompts[i]);
	262	xfree(prompts);
	263	xfree(echo_on);
	264	xfree(name);
	265	xfree(instr);
	266	return 1;
59c97189	267	}
59c97189	268
5ba55ada	269	static void
7819b5c3	270	input_userauth_info_response(int type, u_int32_t seq, void *ctxt)
59c97189	271	{
59c97189	272	Authctxt *authctxt = ctxt;
5ba55ada	273	KbdintAuthctxt *kbdintctxt;
2ceb8101	274	int authenticated = 0, res, len;
2ceb8101	275	u_int i, nresp;
5ba55ada	276	char *response = NULL, method;
59c97189	277
	278	if (authctxt == NULL)
	279	fatal("input_userauth_info_response: no authctxt");
5ba55ada	280	kbdintctxt = authctxt->kbdintctxt;
	281	if (kbdintctxt == NULL \|\| kbdintctxt->ctxt == NULL)
	282	fatal("input_userauth_info_response: no kbdintctxt");
	283	if (kbdintctxt->device == NULL)
	284	fatal("input_userauth_info_response: no device");
59c97189	285
	286	authctxt->postponed = 0; /* reset */
	287	nresp = packet_get_int();
477edc5d	288	if (nresp != kbdintctxt->nreq)
	289	fatal("input_userauth_info_response: wrong number of replies");
	290	if (nresp > 100)
	291	fatal("input_userauth_info_response: too many replies");
5ba55ada	292	if (nresp > 0) {
52e3daed	293	response = xcalloc(nresp, sizeof(char *));
5ba55ada	294	for (i = 0; i < nresp; i++)
	295	response[i] = packet_get_string(NULL);
	296	}
95500969	297	packet_check_eom();
5ba55ada	298
37ea4f91	299	res = kbdintctxt->device->respond(kbdintctxt->ctxt, nresp, response);
5ba55ada	300
	301	for (i = 0; i < nresp; i++) {
	302	memset(response[i], 'r', strlen(response[i]));
	303	xfree(response[i]);
	304	}
	305	if (response)
59c97189	306	xfree(response);
5ba55ada	307
	308	switch (res) {
	309	case 0:
	310	/* Success! */
37ea4f91	311	authenticated = authctxt->valid ? 1 : 0;
5ba55ada	312	break;
	313	case 1:
	314	/* Authentication needs further interaction */
2f293d43	315	if (send_userauth_info_request(authctxt) == 1)
2f293d43	316	authctxt->postponed = 1;
5ba55ada	317	break;
	318	default:
	319	/* Failure! */
	320	break;
59c97189	321	}
5ba55ada	322
	323	len = strlen("keyboard-interactive") + 2 +
	324	strlen(kbdintctxt->device->name);
	325	method = xmalloc(len);
bd2d2ac4	326	snprintf(method, len, "keyboard-interactive/%s",
bd2d2ac4	327	kbdintctxt->device->name);
5ba55ada	328
5ba55ada	329	if (!authctxt->postponed) {
5ba55ada	330	if (authenticated) {
2f293d43	331	auth2_challenge_stop(authctxt);
5ba55ada	332	} else {
	333	/* start next device */
	334	/* may set authctxt->postponed */
	335	auth2_challenge_start(authctxt);
	336	}
	337	}
d9cd3575	338	userauth_finish(authctxt, authenticated, method);
5ba55ada	339	xfree(method);
59c97189	340	}
1853d1ef	341
	342	void
	343	privsep_challenge_enable(void)
	344	{
4881aebb	345	#if defined(BSD_AUTH) \|\| defined(USE_PAM) \|\| defined(SKEY)
	346	int n = 0;
	347	#endif
1853d1ef	348	#ifdef BSD_AUTH
	349	extern KbdintDevice mm_bsdauth_device;
	350	#endif
05114c74	351	#ifdef USE_PAM
	352	extern KbdintDevice mm_sshpam_device;
	353	#endif
1853d1ef	354	#ifdef SKEY
	355	extern KbdintDevice mm_skey_device;
	356	#endif
05114c74	357
1853d1ef	358	#ifdef BSD_AUTH
05114c74	359	devices[n++] = &mm_bsdauth_device;
1853d1ef	360	#else
05114c74	361	#ifdef USE_PAM
	362	devices[n++] = &mm_sshpam_device;
	363	#endif
1853d1ef	364	#ifdef SKEY
05114c74	365	devices[n++] = &mm_skey_device;
1853d1ef	366	#endif
	367	#endif
	368	}