[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 1.20 2002/06/30 21:59:45 deraadt Exp $");

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

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;
};

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

	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();

	if (authctxt->valid) {
		res = kbdintctxt->device->respond(kbdintctxt->ctxt,
		    nresp, response);
	} else {
		res = -1;
	}

	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 = 1;
		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"
41b2f314	26	RCSID("$OpenBSD: auth2-chall.c,v 1.20 2002/06/30 21:59:45 deraadt 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"
	34	#include "auth.h"
	35	#include "log.h"
	36
	37	static int auth2_challenge_start(Authctxt *);
	38	static int send_userauth_info_request(Authctxt *);
e9a17296	39	static void input_userauth_info_response(int, u_int32_t, void *);
3c0ef626	40
	41	#ifdef BSD_AUTH
	42	extern KbdintDevice bsdauth_device;
	43	#else
0fff78ff	44	#ifdef USE_PAM
	45	extern KbdintDevice sshpam_device;
	46	#endif
3c0ef626	47	#ifdef SKEY
	48	extern KbdintDevice skey_device;
	49	#endif
	50	#endif
	51
	52	KbdintDevice *devices[] = {
	53	#ifdef BSD_AUTH
	54	&bsdauth_device,
	55	#else
0fff78ff	56	#ifdef USE_PAM
	57	&sshpam_device,
	58	#endif
3c0ef626	59	#ifdef SKEY
	60	&skey_device,
	61	#endif
	62	#endif
	63	NULL
	64	};
	65
	66	typedef struct KbdintAuthctxt KbdintAuthctxt;
	67	struct KbdintAuthctxt
	68	{
	69	char *devices;
	70	void *ctxt;
	71	KbdintDevice *device;
680cee3b	72	u_int nreq;
3c0ef626	73	};
	74
	75	static KbdintAuthctxt *
	76	kbdint_alloc(const char *devs)
	77	{
	78	KbdintAuthctxt *kbdintctxt;
e9a17296	79	Buffer b;
3c0ef626	80	int i;
3c0ef626	81
	82	kbdintctxt = xmalloc(sizeof(KbdintAuthctxt));
	83	if (strcmp(devs, "") == 0) {
e9a17296	84	buffer_init(&b);
3c0ef626	85	for (i = 0; devices[i]; i++) {
e9a17296	86	if (buffer_len(&b) > 0)
	87	buffer_append(&b, ",", 1);
	88	buffer_append(&b, devices[i]->name,
	89	strlen(devices[i]->name));
3c0ef626	90	}
e9a17296	91	buffer_append(&b, "\0", 1);
	92	kbdintctxt->devices = xstrdup(buffer_ptr(&b));
	93	buffer_free(&b);
3c0ef626	94	} else {
	95	kbdintctxt->devices = xstrdup(devs);
	96	}
e9a17296	97	debug("kbdint_alloc: devices '%s'", kbdintctxt->devices);
3c0ef626	98	kbdintctxt->ctxt = NULL;
3c0ef626	99	kbdintctxt->device = NULL;
680cee3b	100	kbdintctxt->nreq = 0;
3c0ef626	101
	102	return kbdintctxt;
	103	}
	104	static void
	105	kbdint_reset_device(KbdintAuthctxt *kbdintctxt)
	106	{
	107	if (kbdintctxt->ctxt) {
	108	kbdintctxt->device->free_ctx(kbdintctxt->ctxt);
	109	kbdintctxt->ctxt = NULL;
	110	}
	111	kbdintctxt->device = NULL;
	112	}
	113	static void
	114	kbdint_free(KbdintAuthctxt *kbdintctxt)
	115	{
	116	if (kbdintctxt->device)
	117	kbdint_reset_device(kbdintctxt);
	118	if (kbdintctxt->devices) {
	119	xfree(kbdintctxt->devices);
	120	kbdintctxt->devices = NULL;
	121	}
	122	xfree(kbdintctxt);
	123	}
	124	/* get next device */
	125	static int
	126	kbdint_next_device(KbdintAuthctxt *kbdintctxt)
	127	{
	128	size_t len;
	129	char *t;
	130	int i;
	131
	132	if (kbdintctxt->device)
	133	kbdint_reset_device(kbdintctxt);
	134	do {
	135	len = kbdintctxt->devices ?
	136	strcspn(kbdintctxt->devices, ",") : 0;
	137
	138	if (len == 0)
	139	break;
	140	for (i = 0; devices[i]; i++)
	141	if (strncmp(kbdintctxt->devices, devices[i]->name, len) == 0)
	142	kbdintctxt->device = devices[i];
	143	t = kbdintctxt->devices;
	144	kbdintctxt->devices = t[len] ? xstrdup(t+len+1) : NULL;
	145	xfree(t);
	146	debug2("kbdint_next_device: devices %s", kbdintctxt->devices ?
	147	kbdintctxt->devices : "<empty>");
	148	} while (kbdintctxt->devices && !kbdintctxt->device);
	149
	150	return kbdintctxt->device ? 1 : 0;
	151	}
	152
	153	/*
	154	* try challenge-response, set authctxt->postponed if we have to
	155	* wait for the response.
	156	*/
	157	int
	158	auth2_challenge(Authctxt authctxt, char devs)
	159	{
	160	debug("auth2_challenge: user=%s devs=%s",
	161	authctxt->user ? authctxt->user : "<nouser>",
	162	devs ? devs : "<no devs>");
	163
	164	if (authctxt->user == NULL \|\| !devs)
165	return 0;
e9a17296	166	if (authctxt->kbdintctxt == NULL)
3c0ef626	167	authctxt->kbdintctxt = kbdint_alloc(devs);
	168	return auth2_challenge_start(authctxt);
	169	}
	170
e9a17296	171	/* unregister kbd-int callbacks and context */
	172	void
	173	auth2_challenge_stop(Authctxt *authctxt)
	174	{
	175	/* unregister callback */
	176	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL);
	177	if (authctxt->kbdintctxt != NULL) {
	178	kbdint_free(authctxt->kbdintctxt);
	179	authctxt->kbdintctxt = NULL;
	180	}
	181	}
	182
3c0ef626	183	/* side effect: sets authctxt->postponed if a reply was sent*/
	184	static int
	185	auth2_challenge_start(Authctxt *authctxt)
	186	{
	187	KbdintAuthctxt *kbdintctxt = authctxt->kbdintctxt;
	188
	189	debug2("auth2_challenge_start: devices %s",
	190	kbdintctxt->devices ? kbdintctxt->devices : "<empty>");
	191
	192	if (kbdint_next_device(kbdintctxt) == 0) {
e9a17296	193	auth2_challenge_stop(authctxt);
3c0ef626	194	return 0;
	195	}
	196	debug("auth2_challenge_start: trying authentication method '%s'",
	197	kbdintctxt->device->name);
	198
	199	if ((kbdintctxt->ctxt = kbdintctxt->device->init_ctx(authctxt)) == NULL) {
e9a17296	200	auth2_challenge_stop(authctxt);
3c0ef626	201	return 0;
	202	}
	203	if (send_userauth_info_request(authctxt) == 0) {
e9a17296	204	auth2_challenge_stop(authctxt);
3c0ef626	205	return 0;
	206	}
	207	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
	208	&input_userauth_info_response);
	209
	210	authctxt->postponed = 1;
	211	return 0;
	212	}
	213
	214	static int
	215	send_userauth_info_request(Authctxt *authctxt)
	216	{
	217	KbdintAuthctxt *kbdintctxt;
	218	char name, instr, **prompts;
	219	int i;
680cee3b	220	u_int *echo_on;
3c0ef626	221
	222	kbdintctxt = authctxt->kbdintctxt;
	223	if (kbdintctxt->device->query(kbdintctxt->ctxt,
680cee3b	224	&name, &instr, &kbdintctxt->nreq, &prompts, &echo_on))
3c0ef626	225	return 0;
	226
	227	packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST);
	228	packet_put_cstring(name);
	229	packet_put_cstring(instr);
f5799ae1	230	packet_put_cstring(""); /* language not used */
680cee3b	231	packet_put_int(kbdintctxt->nreq);
680cee3b	232	for (i = 0; i < kbdintctxt->nreq; i++) {
3c0ef626	233	packet_put_cstring(prompts[i]);
	234	packet_put_char(echo_on[i]);
	235	}
	236	packet_send();
	237	packet_write_wait();
	238
680cee3b	239	for (i = 0; i < kbdintctxt->nreq; i++)
3c0ef626	240	xfree(prompts[i]);
	241	xfree(prompts);
	242	xfree(echo_on);
	243	xfree(name);
	244	xfree(instr);
	245	return 1;
	246	}
	247
	248	static void
e9a17296	249	input_userauth_info_response(int type, u_int32_t seq, void *ctxt)
3c0ef626	250	{
	251	Authctxt *authctxt = ctxt;
	252	KbdintAuthctxt *kbdintctxt;
	253	int i, authenticated = 0, res, len;
	254	u_int nresp;
	255	char *response = NULL, method;
	256
	257	if (authctxt == NULL)
	258	fatal("input_userauth_info_response: no authctxt");
	259	kbdintctxt = authctxt->kbdintctxt;
	260	if (kbdintctxt == NULL \|\| kbdintctxt->ctxt == NULL)
	261	fatal("input_userauth_info_response: no kbdintctxt");
	262	if (kbdintctxt->device == NULL)
	263	fatal("input_userauth_info_response: no device");
	264
	265	authctxt->postponed = 0; /* reset */
	266	nresp = packet_get_int();
680cee3b	267	if (nresp != kbdintctxt->nreq)
	268	fatal("input_userauth_info_response: wrong number of replies");
	269	if (nresp > 100)
	270	fatal("input_userauth_info_response: too many replies");
3c0ef626	271	if (nresp > 0) {
41b2f314	272	response = xmalloc(nresp * sizeof(char *));
3c0ef626	273	for (i = 0; i < nresp; i++)
	274	response[i] = packet_get_string(NULL);
	275	}
e9a17296	276	packet_check_eom();
3c0ef626	277
	278	if (authctxt->valid) {
	279	res = kbdintctxt->device->respond(kbdintctxt->ctxt,
	280	nresp, response);
	281	} else {
	282	res = -1;
	283	}
	284
	285	for (i = 0; i < nresp; i++) {
	286	memset(response[i], 'r', strlen(response[i]));
	287	xfree(response[i]);
	288	}
	289	if (response)
	290	xfree(response);
	291
	292	switch (res) {
	293	case 0:
	294	/* Success! */
	295	authenticated = 1;
	296	break;
	297	case 1:
	298	/* Authentication needs further interaction */
e9a17296	299	if (send_userauth_info_request(authctxt) == 1)
e9a17296	300	authctxt->postponed = 1;
3c0ef626	301	break;
	302	default:
	303	/* Failure! */
	304	break;
	305	}
	306
	307	len = strlen("keyboard-interactive") + 2 +
	308	strlen(kbdintctxt->device->name);
	309	method = xmalloc(len);
e9a17296	310	snprintf(method, len, "keyboard-interactive/%s",
e9a17296	311	kbdintctxt->device->name);
3c0ef626	312
3c0ef626	313	if (!authctxt->postponed) {
3c0ef626	314	if (authenticated) {
e9a17296	315	auth2_challenge_stop(authctxt);
3c0ef626	316	} else {
	317	/* start next device */
	318	/* may set authctxt->postponed */
	319	auth2_challenge_start(authctxt);
	320	}
	321	}
	322	userauth_finish(authctxt, authenticated, method);
	323	xfree(method);
	324	}
700318f3	325
	326	void
	327	privsep_challenge_enable(void)
	328	{
0fff78ff	329	#if defined(BSD_AUTH) \|\| defined(USE_PAM) \|\| defined(SKEY)
	330	int n = 0;
	331	#endif
700318f3	332	#ifdef BSD_AUTH
	333	extern KbdintDevice mm_bsdauth_device;
	334	#endif
0fff78ff	335	#ifdef USE_PAM
	336	extern KbdintDevice mm_sshpam_device;
	337	#endif
700318f3	338	#ifdef SKEY
	339	extern KbdintDevice mm_skey_device;
	340	#endif
0fff78ff	341
700318f3	342	#ifdef BSD_AUTH
0fff78ff	343	devices[n++] = &mm_bsdauth_device;
700318f3	344	#else
0fff78ff	345	#ifdef USE_PAM
	346	devices[n++] = &mm_sshpam_device;
	347	#endif
700318f3	348	#ifdef SKEY
0fff78ff	349	devices[n++] = &mm_skey_device;
700318f3	350	#endif
	351	#endif
	352	}