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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/iked/eap.c	Lines:	0	245	0.0 %
Date:	2017-11-13	Branches:	0	110	0.0 %


/*	$OpenBSD: eap.c,v 1.14 2015/08/21 11:59:27 reyk Exp $	*/

/*
 * Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/uio.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <err.h>
#include <pwd.h>
#include <event.h>

#include <openssl/sha.h>
#include <openssl/evp.h>

#include "iked.h"
#include "ikev2.h"
#include "eap.h"
#include "chap_ms.h"

char	*eap_identity_response(struct eap_message *);
int	 eap_challenge_request(struct iked *env, struct iked_sa *,
	    struct eap_header *);
int	 eap_success(struct iked *, struct iked_sa *, struct eap_header *);
int	 eap_mschap(struct iked *, struct iked_sa *, struct eap_message *);

ssize_t
eap_identity_request(struct ibuf *e)
{
	struct eap_message		*eap;

	if ((eap = ibuf_advance(e, sizeof(*eap))) == NULL)
		return (-1);
	eap->eap_code = EAP_CODE_REQUEST;
	eap->eap_id = 0;
	eap->eap_length = htobe16(sizeof(*eap));
	eap->eap_type = EAP_TYPE_IDENTITY;

	return (sizeof(*eap));
}

char *
eap_identity_response(struct eap_message *eap)
{
	size_t			 len;
	char			*str;
	uint8_t			*ptr = (uint8_t *)eap;

	len = betoh16(eap->eap_length) - sizeof(*eap);
	ptr += sizeof(*eap);

	if (len == 0 || (str = get_string(ptr, len)) == NULL) {
		log_info("%s: invalid identity response, length %zu",
		    __func__, len);
		return (NULL);
	}
	log_debug("%s: identity '%s' length %zd", __func__, str, len);
	return (str);
}

int
eap_challenge_request(struct iked *env, struct iked_sa *sa,
    struct eap_header *hdr)
{
	struct eap_message		*eap;
	struct eap_mschap_challenge	*ms;
	const char			*name;
	int				 ret = -1;
	struct ibuf			*e;

	if ((e = ibuf_static()) == NULL)
		return (-1);

	if ((eap = ibuf_advance(e, sizeof(*eap))) == NULL)
		goto done;
	eap->eap_code = EAP_CODE_REQUEST;
	eap->eap_id = hdr->eap_id + 1;
	eap->eap_type = sa->sa_policy->pol_auth.auth_eap;

	switch (sa->sa_policy->pol_auth.auth_eap) {
	case EAP_TYPE_MSCHAP_V2:
		name = IKED_USER;	/* XXX should be user-configurable */
		eap->eap_length = htobe16(sizeof(*eap) +
		    sizeof(*ms) + strlen(name));

		if ((ms = ibuf_advance(e, sizeof(*ms))) == NULL)
			return (-1);
		ms->msc_opcode = EAP_MSOPCODE_CHALLENGE;
		ms->msc_id = eap->eap_id;
		ms->msc_length = htobe16(sizeof(*ms) + strlen(name));
		ms->msc_valuesize = sizeof(ms->msc_challenge);
		arc4random_buf(ms->msc_challenge, sizeof(ms->msc_challenge));
		if (ibuf_add(e, name, strlen(name)) == -1)
			goto done;

		/* Store the EAP challenge value */
		sa->sa_eap.id_type = eap->eap_type;
		if ((sa->sa_eap.id_buf = ibuf_new(ms->msc_challenge,
		    sizeof(ms->msc_challenge))) == NULL)
			goto done;
		break;
	default:
		log_debug("%s: unsupported EAP type %s", __func__,
		    print_map(eap->eap_type, eap_type_map));
		goto done;
	}

	ret = ikev2_send_ike_e(env, sa, e,
	    IKEV2_PAYLOAD_EAP, IKEV2_EXCHANGE_IKE_AUTH, 1);

 done:
	ibuf_release(e);

	return (ret);
}

int
eap_success(struct iked *env, struct iked_sa *sa, struct eap_header *hdr)
{
	struct eap_header		*resp;
	int				 ret = -1;
	struct ibuf			*e;

	if ((e = ibuf_static()) == NULL)
		return (-1);

	if ((resp = ibuf_advance(e, sizeof(*resp))) == NULL)
		goto done;
	resp->eap_code = EAP_CODE_SUCCESS;
	resp->eap_id = hdr->eap_id;
	resp->eap_length = htobe16(sizeof(*resp));

	ret = ikev2_send_ike_e(env, sa, e,
	    IKEV2_PAYLOAD_EAP, IKEV2_EXCHANGE_IKE_AUTH, 1);

 done:
	ibuf_release(e);

	return (ret);
}

int
eap_mschap(struct iked *env, struct iked_sa *sa, struct eap_message *eap)
{
	struct iked_user		*usr;
	struct eap_message		*resp;
	struct eap_mschap_response	*msr;
	struct eap_mschap_peer		*msp;
	struct eap_mschap		*ms;
	struct eap_mschap_success	*mss;
	uint8_t				*ptr, *pass;
	size_t				 len, passlen;
	char				*name, *msg;
	uint8_t				 ntresponse[EAP_MSCHAP_NTRESPONSE_SZ];
	uint8_t				 successmsg[EAP_MSCHAP_SUCCESS_SZ];
	struct ibuf			*eapmsg = NULL;
	int				 ret = -1;

	if (!sa_stateok(sa, IKEV2_STATE_EAP)) {
		log_debug("%s: unexpected EAP", __func__);
		return (0);	/* ignore */
	}

	if (sa->sa_hdr.sh_initiator) {
		log_debug("%s: initiator EAP not supported", __func__);
		return (-1);
	}

	/* Only MSCHAP-V2 */
	if (eap->eap_type != EAP_TYPE_MSCHAP_V2) {
		log_debug("%s: unsupported type EAP-%s", __func__,
		    print_map(eap->eap_type, eap_type_map));
		return (-1);
	}

	if (betoh16(eap->eap_length) < (sizeof(*eap) + sizeof(*ms))) {
		log_debug("%s: short message", __func__);
		return (-1);
	}

	ms = (struct eap_mschap *)(eap + 1);
	ptr = (uint8_t *)(eap + 1);

	switch (ms->ms_opcode) {
	case EAP_MSOPCODE_RESPONSE:
		msr = (struct eap_mschap_response *)ms;
		if (betoh16(eap->eap_length) < (sizeof(*eap) + sizeof(*msr))) {
			log_debug("%s: short response", __func__);
			return (-1);
		}
		ptr += sizeof(*msr);
		len = betoh16(eap->eap_length) -
		    sizeof(*eap) - sizeof(*msr);
		if (len == 0 && sa->sa_eapid != NULL)
			name = strdup(sa->sa_eapid);
		else
			name = get_string(ptr, len);
		if (name == NULL) {
			log_debug("%s: invalid response name", __func__);
			return (-1);
		}
		if ((usr = user_lookup(env, name)) == NULL) {
			log_debug("%s: unknown user '%s'", __func__, name);
			free(name);
			return (-1);
		}
		free(name);

		if ((pass = string2unicode(usr->usr_pass, &passlen)) == NULL)
			return (-1);

		msp = &msr->msr_response.resp_peer;
		mschap_nt_response(ibuf_data(sa->sa_eap.id_buf),
		    msp->msp_challenge, usr->usr_name, strlen(usr->usr_name),
		    pass, passlen, ntresponse);

		if (memcmp(ntresponse, msp->msp_ntresponse,
		    sizeof(ntresponse)) != 0) {
			log_debug("%s: '%s' authentication failed", __func__,
			    usr->usr_name);
			free(pass);

			/* XXX should we send an EAP failure packet? */
			return (-1);
		}

		bzero(&successmsg, sizeof(successmsg));
		mschap_auth_response(pass, passlen,
		    ntresponse, ibuf_data(sa->sa_eap.id_buf),
		    msp->msp_challenge, usr->usr_name, strlen(usr->usr_name),
		    successmsg);
		if ((sa->sa_eapmsk = ibuf_new(NULL, MSCHAP_MSK_SZ)) == NULL) {
			log_debug("%s: failed to get MSK", __func__);
			free(pass);
			return (-1);
		}
		mschap_msk(pass, passlen, ntresponse,
		    ibuf_data(sa->sa_eapmsk));
		free(pass);

		log_info("%s: '%s' authenticated", __func__, usr->usr_name);


		if ((eapmsg = ibuf_static()) == NULL)
			return (-1);

		msg = " M=Welcome";

		if ((resp = ibuf_advance(eapmsg, sizeof(*resp))) == NULL)
			goto done;
		resp->eap_code = EAP_CODE_REQUEST;
		resp->eap_id = eap->eap_id + 1;
		resp->eap_length = htobe16(sizeof(*resp) + sizeof(*mss) +
		    sizeof(successmsg) + strlen(msg));
		resp->eap_type = EAP_TYPE_MSCHAP_V2;

		if ((mss = ibuf_advance(eapmsg, sizeof(*mss))) == NULL)
			goto done;
		mss->mss_opcode = EAP_MSOPCODE_SUCCESS;
		mss->mss_id = msr->msr_id;
		mss->mss_length = htobe16(sizeof(*mss) +
		    sizeof(successmsg) + strlen(msg));
		if (ibuf_add(eapmsg, successmsg, sizeof(successmsg)) != 0)
			goto done;
		if (ibuf_add(eapmsg, msg, strlen(msg)) != 0)
			goto done;
		break;
	case EAP_MSOPCODE_SUCCESS:
		if ((eapmsg = ibuf_static()) == NULL)
			return (-1);
		if ((resp = ibuf_advance(eapmsg, sizeof(*resp))) == NULL)
			goto done;
		resp->eap_code = EAP_CODE_RESPONSE;
		resp->eap_id = eap->eap_id;
		resp->eap_length = htobe16(sizeof(*resp) + sizeof(*ms));
		resp->eap_type = EAP_TYPE_MSCHAP_V2;
		if ((ms = ibuf_advance(eapmsg, sizeof(*ms))) == NULL)
			goto done;
		ms->ms_opcode = EAP_MSOPCODE_SUCCESS;
		break;
	case EAP_MSOPCODE_FAILURE:
	case EAP_MSOPCODE_CHANGE_PASSWORD:
	case EAP_MSOPCODE_CHALLENGE:
	default:
		log_debug("%s: EAP-%s unsupported "
		    "responder operation %s", __func__,
		    print_map(eap->eap_type, eap_type_map),
		    print_map(ms->ms_opcode, eap_msopcode_map));
		return (-1);
	}

	if (eapmsg != NULL)
		ret = ikev2_send_ike_e(env, sa, eapmsg,
		    IKEV2_PAYLOAD_EAP, IKEV2_EXCHANGE_IKE_AUTH, 1);

	if (ret == 0)
		sa_state(env, sa, IKEV2_STATE_AUTH_SUCCESS);

 done:
	ibuf_release(eapmsg);
	return (ret);
}

int
eap_parse(struct iked *env, struct iked_sa *sa, void *data, int response)
{
	struct eap_header		*hdr = data;
	struct eap_message		*eap = data;
	size_t				 len;
	uint8_t				*ptr;
	struct eap_mschap		*ms;
	struct eap_mschap_challenge	*msc;
	struct eap_mschap_response	*msr;
	struct eap_mschap_success	*mss;
	struct eap_mschap_failure	*msf;
	char				*str;

	/* length is already verified by the caller */
	len = betoh16(hdr->eap_length);
	ptr = (uint8_t *)(eap + 1);

	switch (hdr->eap_code) {
	case EAP_CODE_REQUEST:
	case EAP_CODE_RESPONSE:
		if (len < sizeof(*eap)) {
			log_debug("%s: short message", __func__);
			return (-1);
		}
		break;
	case EAP_CODE_SUCCESS:
		return (0);
	case EAP_CODE_FAILURE:
		if (response)
			return (0);
		return (-1);
	default:
		log_debug("%s: unsupported EAP code %s", __func__,
		    print_map(hdr->eap_code, eap_code_map));
		return (-1);
	}

	switch (eap->eap_type) {
	case EAP_TYPE_IDENTITY:
		if (eap->eap_code == EAP_CODE_REQUEST)
			break;
		if ((str = eap_identity_response(eap)) == NULL)
			return (-1);
		if (response) {
			free(str);
			break;
		}
		if (sa->sa_eapid != NULL) {
			free(str);
			log_debug("%s: EAP identity already known", __func__);
			return (0);
		}
		sa->sa_eapid = str;
		return (eap_challenge_request(env, sa, hdr));
	case EAP_TYPE_MSCHAP_V2:
		ms = (struct eap_mschap *)ptr;
		switch (ms->ms_opcode) {
		case EAP_MSOPCODE_CHALLENGE:
			msc = (struct eap_mschap_challenge *)ptr;
			ptr += sizeof(*msc);
			len = betoh16(eap->eap_length) -
			    sizeof(*eap) - sizeof(*msc);
			if ((str = get_string(ptr, len)) == NULL) {
				log_debug("%s: invalid challenge name",
				    __func__);
				return (-1);
			}
			log_info("%s: %s %s id %d "
			    "length %d valuesize %d name '%s' length %zu",
			    __func__,
			    print_map(eap->eap_type, eap_type_map),
			    print_map(ms->ms_opcode, eap_msopcode_map),
			    msc->msc_id, betoh16(msc->msc_length),
			    msc->msc_valuesize, str, len);
			free(str);
			print_hex(msc->msc_challenge, 0,
			    sizeof(msc->msc_challenge));
			break;
		case EAP_MSOPCODE_RESPONSE:
			msr = (struct eap_mschap_response *)ptr;
			ptr += sizeof(*msr);
			len = betoh16(eap->eap_length) -
			    sizeof(*eap) - sizeof(*msr);
			if ((str = get_string(ptr, len)) == NULL) {
				log_debug("%s: invalid response name",
				    __func__);
				return (-1);
			}
			log_info("%s: %s %s id %d "
			    "length %d valuesize %d name '%s' name-length %zu",
			    __func__,
			    print_map(eap->eap_type, eap_type_map),
			    print_map(ms->ms_opcode, eap_msopcode_map),
			    msr->msr_id, betoh16(msr->msr_length),
			    msr->msr_valuesize, str, len);
			free(str);
			print_hex(msr->msr_response.resp_data, 0,
			    sizeof(msr->msr_response.resp_data));
			break;
		case EAP_MSOPCODE_SUCCESS:
			if (eap->eap_code == EAP_CODE_REQUEST) {
				mss = (struct eap_mschap_success *)ptr;
				ptr += sizeof(*mss);
				len = betoh16(eap->eap_length) -
				    sizeof(*eap) - sizeof(*mss);
				if ((str = get_string(ptr, len)) == NULL) {
					log_debug("%s: invalid response name",
					    __func__);
					return (-1);
				}
				log_info("%s: %s %s request id %d "
				    "length %d message '%s' message-len %zu",
				    __func__,
				    print_map(eap->eap_type, eap_type_map),
				    print_map(ms->ms_opcode, eap_msopcode_map),
				    mss->mss_id, betoh16(mss->mss_length),
				    str, len);
				free(str);
			} else {
				ms = (struct eap_mschap *)ptr;
				log_info("%s: %s %s response", __func__,
				    print_map(eap->eap_type, eap_type_map),
				    print_map(ms->ms_opcode, eap_msopcode_map));
				if (response)
					break;
				if (!sa_stateok(sa, IKEV2_STATE_AUTH_SUCCESS))
					return (-1);

				return (eap_success(env, sa, hdr));
			}
			break;
		case EAP_MSOPCODE_FAILURE:
			msf = (struct eap_mschap_failure *)ptr;
			ptr += sizeof(*msf);
			len = betoh16(eap->eap_length) -
			    sizeof(*eap) - sizeof(*msf);
			if ((str = get_string(ptr, len)) == NULL) {
				log_debug("%s: invalid failure message",
				    __func__);
				return (-1);
			}
			log_info("%s: %s %s id %d "
			    "length %d message '%s'", __func__,
			    print_map(eap->eap_type, eap_type_map),
			    print_map(ms->ms_opcode, eap_msopcode_map),
			    msf->msf_id, betoh16(msf->msf_length), str);
			free(str);
			break;
		default:
			log_info("%s: unknown ms opcode %d", __func__,
			    ms->ms_opcode);
			return (-1);
		}
		if (response)
			break;

		return (eap_mschap(env, sa, eap));
	default:
		log_debug("%s: unsupported EAP type %s", __func__,
		    print_map(eap->eap_type, eap_type_map));
		return (-1);
	}

	return (0);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: eap.c,v 1.14 2015/08/21 11:59:27 reyk Exp $ */
2
3			/*
4			* Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org>
5			*
6			* Permission to use, copy, modify, and distribute this software for any
7			* purpose with or without fee is hereby granted, provided that the above
8			* copyright notice and this permission notice appear in all copies.
9			*
10			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17			*/
18
19			#include <sys/queue.h>
20			#include <sys/socket.h>
21			#include <sys/wait.h>
22			#include <sys/uio.h>
23
24			#include <netinet/in.h>
25			#include <arpa/inet.h>
26
27			#include <stdlib.h>
28			#include <stdio.h>
29			#include <unistd.h>
30			#include <string.h>
31			#include <signal.h>
32			#include <errno.h>
33			#include <err.h>
34			#include <pwd.h>
35			#include <event.h>
36
37			#include <openssl/sha.h>
38			#include <openssl/evp.h>
39
40			#include "iked.h"
41			#include "ikev2.h"
42			#include "eap.h"
43			#include "chap_ms.h"
44
45			char eap_identity_response(struct eap_message );
46			int eap_challenge_request(struct iked env, struct iked_sa ,
47			struct eap_header *);
48			int eap_success(struct iked , struct iked_sa , struct eap_header *);
49			int eap_mschap(struct iked , struct iked_sa , struct eap_message *);
50
51			ssize_t
52			eap_identity_request(struct ibuf *e)
53			{
54			struct eap_message *eap;
55
56			if ((eap = ibuf_advance(e, sizeof(*eap))) == NULL)
57			return (-1);
58			eap->eap_code = EAP_CODE_REQUEST;
59			eap->eap_id = 0;
60			eap->eap_length = htobe16(sizeof(*eap));
61			eap->eap_type = EAP_TYPE_IDENTITY;
62
63			return (sizeof(*eap));
64			}
65
66			char *
67			eap_identity_response(struct eap_message *eap)
68			{
69			size_t len;
70			char *str;
71			uint8_t ptr = (uint8_t )eap;
72
73			len = betoh16(eap->eap_length) - sizeof(*eap);
74			ptr += sizeof(*eap);
75
76			if (len == 0 \|\| (str = get_string(ptr, len)) == NULL) {
77			log_info("%s: invalid identity response, length %zu",
78			__func__, len);
79			return (NULL);
80			}
81			log_debug("%s: identity '%s' length %zd", __func__, str, len);
82			return (str);
83			}
84
85			int
86			eap_challenge_request(struct iked env, struct iked_sa sa,
87			struct eap_header *hdr)
88			{
89			struct eap_message *eap;
90			struct eap_mschap_challenge *ms;
91			const char *name;
92			int ret = -1;
93			struct ibuf *e;
94
95			if ((e = ibuf_static()) == NULL)
96			return (-1);
97
98			if ((eap = ibuf_advance(e, sizeof(*eap))) == NULL)
99			goto done;
100			eap->eap_code = EAP_CODE_REQUEST;
101			eap->eap_id = hdr->eap_id + 1;
102			eap->eap_type = sa->sa_policy->pol_auth.auth_eap;
103
104			switch (sa->sa_policy->pol_auth.auth_eap) {
105			case EAP_TYPE_MSCHAP_V2:
106			name = IKED_USER; /* XXX should be user-configurable */
107			eap->eap_length = htobe16(sizeof(*eap) +
108			sizeof(*ms) + strlen(name));
109
110			if ((ms = ibuf_advance(e, sizeof(*ms))) == NULL)
111			return (-1);
112			ms->msc_opcode = EAP_MSOPCODE_CHALLENGE;
113			ms->msc_id = eap->eap_id;
114			ms->msc_length = htobe16(sizeof(*ms) + strlen(name));
115			ms->msc_valuesize = sizeof(ms->msc_challenge);
116			arc4random_buf(ms->msc_challenge, sizeof(ms->msc_challenge));
117			if (ibuf_add(e, name, strlen(name)) == -1)
118			goto done;
119
120			/* Store the EAP challenge value */
121			sa->sa_eap.id_type = eap->eap_type;
122			if ((sa->sa_eap.id_buf = ibuf_new(ms->msc_challenge,
123			sizeof(ms->msc_challenge))) == NULL)
124			goto done;
125			break;
126			default:
127			log_debug("%s: unsupported EAP type %s", __func__,
128			print_map(eap->eap_type, eap_type_map));
129			goto done;
130			}
131
132			ret = ikev2_send_ike_e(env, sa, e,
133			IKEV2_PAYLOAD_EAP, IKEV2_EXCHANGE_IKE_AUTH, 1);
134
135			done:
136			ibuf_release(e);
137
138			return (ret);
139			}
140
141			int
142			eap_success(struct iked env, struct iked_sa sa, struct eap_header *hdr)
143			{
144			struct eap_header *resp;
145			int ret = -1;
146			struct ibuf *e;
147
148			if ((e = ibuf_static()) == NULL)
149			return (-1);
150
151			if ((resp = ibuf_advance(e, sizeof(*resp))) == NULL)
152			goto done;
153			resp->eap_code = EAP_CODE_SUCCESS;
154			resp->eap_id = hdr->eap_id;
155			resp->eap_length = htobe16(sizeof(*resp));
156
157			ret = ikev2_send_ike_e(env, sa, e,
158			IKEV2_PAYLOAD_EAP, IKEV2_EXCHANGE_IKE_AUTH, 1);
159
160			done:
161			ibuf_release(e);
162
163			return (ret);
164			}
165
166			int
167			eap_mschap(struct iked env, struct iked_sa sa, struct eap_message *eap)
168			{
169			struct iked_user *usr;
170			struct eap_message *resp;
171			struct eap_mschap_response *msr;
172			struct eap_mschap_peer *msp;
173			struct eap_mschap *ms;
174			struct eap_mschap_success *mss;
175			uint8_t ptr, pass;
176			size_t len, passlen;
177			char name, msg;
178			uint8_t ntresponse[EAP_MSCHAP_NTRESPONSE_SZ];
179			uint8_t successmsg[EAP_MSCHAP_SUCCESS_SZ];
180			struct ibuf *eapmsg = NULL;
181			int ret = -1;
182
183			if (!sa_stateok(sa, IKEV2_STATE_EAP)) {
184			log_debug("%s: unexpected EAP", __func__);
185			return (0); /* ignore */
186			}
187
188			if (sa->sa_hdr.sh_initiator) {
189			log_debug("%s: initiator EAP not supported", __func__);
190			return (-1);
191			}
192
193			/* Only MSCHAP-V2 */
194			if (eap->eap_type != EAP_TYPE_MSCHAP_V2) {
195			log_debug("%s: unsupported type EAP-%s", __func__,
196			print_map(eap->eap_type, eap_type_map));
197			return (-1);
198			}
199
200			if (betoh16(eap->eap_length) < (sizeof(eap) + sizeof(ms))) {
201			log_debug("%s: short message", __func__);
202			return (-1);
203			}
204
205			ms = (struct eap_mschap *)(eap + 1);
206			ptr = (uint8_t *)(eap + 1);
207
208			switch (ms->ms_opcode) {
209			case EAP_MSOPCODE_RESPONSE:
210			msr = (struct eap_mschap_response *)ms;
211			if (betoh16(eap->eap_length) < (sizeof(eap) + sizeof(msr))) {
212			log_debug("%s: short response", __func__);
213			return (-1);
214			}
215			ptr += sizeof(*msr);
216			len = betoh16(eap->eap_length) -
217			sizeof(eap) - sizeof(msr);
218			if (len == 0 && sa->sa_eapid != NULL)
219			name = strdup(sa->sa_eapid);
220			else
221			name = get_string(ptr, len);
222			if (name == NULL) {
223			log_debug("%s: invalid response name", __func__);
224			return (-1);
225			}
226			if ((usr = user_lookup(env, name)) == NULL) {
227			log_debug("%s: unknown user '%s'", __func__, name);
228			free(name);
229			return (-1);
230			}
231			free(name);
232
233			if ((pass = string2unicode(usr->usr_pass, &passlen)) == NULL)
234			return (-1);
235
236			msp = &msr->msr_response.resp_peer;
237			mschap_nt_response(ibuf_data(sa->sa_eap.id_buf),
238			msp->msp_challenge, usr->usr_name, strlen(usr->usr_name),
239			pass, passlen, ntresponse);
240
241			if (memcmp(ntresponse, msp->msp_ntresponse,
242			sizeof(ntresponse)) != 0) {
243			log_debug("%s: '%s' authentication failed", __func__,
244			usr->usr_name);
245			free(pass);
246
247			/* XXX should we send an EAP failure packet? */
248			return (-1);
249			}
250
251			bzero(&successmsg, sizeof(successmsg));
252			mschap_auth_response(pass, passlen,
253			ntresponse, ibuf_data(sa->sa_eap.id_buf),
254			msp->msp_challenge, usr->usr_name, strlen(usr->usr_name),
255			successmsg);
256			if ((sa->sa_eapmsk = ibuf_new(NULL, MSCHAP_MSK_SZ)) == NULL) {
257			log_debug("%s: failed to get MSK", __func__);
258			free(pass);
259			return (-1);
260			}
261			mschap_msk(pass, passlen, ntresponse,
262			ibuf_data(sa->sa_eapmsk));
263			free(pass);
264
265			log_info("%s: '%s' authenticated", __func__, usr->usr_name);
266
267
268			if ((eapmsg = ibuf_static()) == NULL)
269			return (-1);
270
271			msg = " M=Welcome";
272
273			if ((resp = ibuf_advance(eapmsg, sizeof(*resp))) == NULL)
274			goto done;
275			resp->eap_code = EAP_CODE_REQUEST;
276			resp->eap_id = eap->eap_id + 1;
277			resp->eap_length = htobe16(sizeof(resp) + sizeof(mss) +
278			sizeof(successmsg) + strlen(msg));
279			resp->eap_type = EAP_TYPE_MSCHAP_V2;
280
281			if ((mss = ibuf_advance(eapmsg, sizeof(*mss))) == NULL)
282			goto done;
283			mss->mss_opcode = EAP_MSOPCODE_SUCCESS;
284			mss->mss_id = msr->msr_id;
285			mss->mss_length = htobe16(sizeof(*mss) +
286			sizeof(successmsg) + strlen(msg));
287			if (ibuf_add(eapmsg, successmsg, sizeof(successmsg)) != 0)
288			goto done;
289			if (ibuf_add(eapmsg, msg, strlen(msg)) != 0)
290			goto done;
291			break;
292			case EAP_MSOPCODE_SUCCESS:
293			if ((eapmsg = ibuf_static()) == NULL)
294			return (-1);
295			if ((resp = ibuf_advance(eapmsg, sizeof(*resp))) == NULL)
296			goto done;
297			resp->eap_code = EAP_CODE_RESPONSE;
298			resp->eap_id = eap->eap_id;
299			resp->eap_length = htobe16(sizeof(resp) + sizeof(ms));
300			resp->eap_type = EAP_TYPE_MSCHAP_V2;
301			if ((ms = ibuf_advance(eapmsg, sizeof(*ms))) == NULL)
302			goto done;
303			ms->ms_opcode = EAP_MSOPCODE_SUCCESS;
304			break;
305			case EAP_MSOPCODE_FAILURE:
306			case EAP_MSOPCODE_CHANGE_PASSWORD:
307			case EAP_MSOPCODE_CHALLENGE:
308			default:
309			log_debug("%s: EAP-%s unsupported "
310			"responder operation %s", __func__,
311			print_map(eap->eap_type, eap_type_map),
312			print_map(ms->ms_opcode, eap_msopcode_map));
313			return (-1);
314			}
315
316			if (eapmsg != NULL)
317			ret = ikev2_send_ike_e(env, sa, eapmsg,
318			IKEV2_PAYLOAD_EAP, IKEV2_EXCHANGE_IKE_AUTH, 1);
319
320			if (ret == 0)
321			sa_state(env, sa, IKEV2_STATE_AUTH_SUCCESS);
322
323			done:
324			ibuf_release(eapmsg);
325			return (ret);
326			}
327
328			int
329			eap_parse(struct iked env, struct iked_sa sa, void *data, int response)
330			{
331			struct eap_header *hdr = data;
332			struct eap_message *eap = data;
333			size_t len;
334			uint8_t *ptr;
335			struct eap_mschap *ms;
336			struct eap_mschap_challenge *msc;
337			struct eap_mschap_response *msr;
338			struct eap_mschap_success *mss;
339			struct eap_mschap_failure *msf;
340			char *str;
341
342			/* length is already verified by the caller */
343			len = betoh16(hdr->eap_length);
344			ptr = (uint8_t *)(eap + 1);
345
346			switch (hdr->eap_code) {
347			case EAP_CODE_REQUEST:
348			case EAP_CODE_RESPONSE:
349			if (len < sizeof(*eap)) {
350			log_debug("%s: short message", __func__);
351			return (-1);
352			}
353			break;
354			case EAP_CODE_SUCCESS:
355			return (0);
356			case EAP_CODE_FAILURE:
357			if (response)
358			return (0);
359			return (-1);
360			default:
361			log_debug("%s: unsupported EAP code %s", __func__,
362			print_map(hdr->eap_code, eap_code_map));
363			return (-1);
364			}
365
366			switch (eap->eap_type) {
367			case EAP_TYPE_IDENTITY:
368			if (eap->eap_code == EAP_CODE_REQUEST)
369			break;
370			if ((str = eap_identity_response(eap)) == NULL)
371			return (-1);
372			if (response) {
373			free(str);
374			break;
375			}
376			if (sa->sa_eapid != NULL) {
377			free(str);
378			log_debug("%s: EAP identity already known", __func__);
379			return (0);
380			}
381			sa->sa_eapid = str;
382			return (eap_challenge_request(env, sa, hdr));
383			case EAP_TYPE_MSCHAP_V2:
384			ms = (struct eap_mschap *)ptr;
385			switch (ms->ms_opcode) {
386			case EAP_MSOPCODE_CHALLENGE:
387			msc = (struct eap_mschap_challenge *)ptr;
388			ptr += sizeof(*msc);
389			len = betoh16(eap->eap_length) -
390			sizeof(eap) - sizeof(msc);
391			if ((str = get_string(ptr, len)) == NULL) {
392			log_debug("%s: invalid challenge name",
393			__func__);
394			return (-1);
395			}
396			log_info("%s: %s %s id %d "
397			"length %d valuesize %d name '%s' length %zu",
398			__func__,
399			print_map(eap->eap_type, eap_type_map),
400			print_map(ms->ms_opcode, eap_msopcode_map),
401			msc->msc_id, betoh16(msc->msc_length),
402			msc->msc_valuesize, str, len);
403			free(str);
404			print_hex(msc->msc_challenge, 0,
405			sizeof(msc->msc_challenge));
406			break;
407			case EAP_MSOPCODE_RESPONSE:
408			msr = (struct eap_mschap_response *)ptr;
409			ptr += sizeof(*msr);
410			len = betoh16(eap->eap_length) -
411			sizeof(eap) - sizeof(msr);
412			if ((str = get_string(ptr, len)) == NULL) {
413			log_debug("%s: invalid response name",
414			__func__);
415			return (-1);
416			}
417			log_info("%s: %s %s id %d "
418			"length %d valuesize %d name '%s' name-length %zu",
419			__func__,
420			print_map(eap->eap_type, eap_type_map),
421			print_map(ms->ms_opcode, eap_msopcode_map),
422			msr->msr_id, betoh16(msr->msr_length),
423			msr->msr_valuesize, str, len);
424			free(str);
425			print_hex(msr->msr_response.resp_data, 0,
426			sizeof(msr->msr_response.resp_data));
427			break;
428			case EAP_MSOPCODE_SUCCESS:
429			if (eap->eap_code == EAP_CODE_REQUEST) {
430			mss = (struct eap_mschap_success *)ptr;
431			ptr += sizeof(*mss);
432			len = betoh16(eap->eap_length) -
433			sizeof(eap) - sizeof(mss);
434			if ((str = get_string(ptr, len)) == NULL) {
435			log_debug("%s: invalid response name",
436			__func__);
437			return (-1);
438			}
439			log_info("%s: %s %s request id %d "
440			"length %d message '%s' message-len %zu",
441			__func__,
442			print_map(eap->eap_type, eap_type_map),
443			print_map(ms->ms_opcode, eap_msopcode_map),
444			mss->mss_id, betoh16(mss->mss_length),
445			str, len);
446			free(str);
447			} else {
448			ms = (struct eap_mschap *)ptr;
449			log_info("%s: %s %s response", __func__,
450			print_map(eap->eap_type, eap_type_map),
451			print_map(ms->ms_opcode, eap_msopcode_map));
452			if (response)
453			break;
454			if (!sa_stateok(sa, IKEV2_STATE_AUTH_SUCCESS))
455			return (-1);
456
457			return (eap_success(env, sa, hdr));
458			}
459			break;
460			case EAP_MSOPCODE_FAILURE:
461			msf = (struct eap_mschap_failure *)ptr;
462			ptr += sizeof(*msf);
463			len = betoh16(eap->eap_length) -
464			sizeof(eap) - sizeof(msf);
465			if ((str = get_string(ptr, len)) == NULL) {
466			log_debug("%s: invalid failure message",
467			__func__);
468			return (-1);
469			}
470			log_info("%s: %s %s id %d "
471			"length %d message '%s'", __func__,
472			print_map(eap->eap_type, eap_type_map),
473			print_map(ms->ms_opcode, eap_msopcode_map),
474			msf->msf_id, betoh16(msf->msf_length), str);
475			free(str);
476			break;
477			default:
478			log_info("%s: unknown ms opcode %d", __func__,
479			ms->ms_opcode);
480			return (-1);
481			}
482			if (response)
483			break;
484
485			return (eap_mschap(env, sa, eap));
486			default:
487			log_debug("%s: unsupported EAP type %s", __func__,
488			print_map(eap->eap_type, eap_type_map));
489			return (-1);
490			}
491
492			return (0);
493			}