eap_aka.c

最新的Host AP 新添加了许多pcmcia 的驱动

/*
 * EAP peer method: EAP-AKA (RFC 4187) and EAP-AKA' (draft-arkko-eap-aka-kdf)
 * Copyright (c) 2004-2008, Jouni Malinen <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "eap_peer/eap_i.h"
#include "pcsc_funcs.h"
#include "eap_common/eap_sim_common.h"
#include "sha1.h"
#include "sha256.h"
#include "crypto.h"
#include "eap_peer/eap_config.h"
#ifdef CONFIG_USIM_SIMULATOR
#include "hlr_auc_gw/milenage.h"
#endif /* CONFIG_USIM_SIMULATOR */


struct eap_aka_data {
	u8 ik[EAP_AKA_IK_LEN], ck[EAP_AKA_CK_LEN], res[EAP_AKA_RES_MAX_LEN];
	size_t res_len;
	u8 nonce_s[EAP_SIM_NONCE_S_LEN];
	u8 mk[EAP_SIM_MK_LEN];
	u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
	u8 k_encr[EAP_SIM_K_ENCR_LEN];
	u8 k_re[EAP_AKA_PRIME_K_RE_LEN]; /* EAP-AKA' only */
	u8 msk[EAP_SIM_KEYING_DATA_LEN];
	u8 emsk[EAP_EMSK_LEN];
	u8 rand[EAP_AKA_RAND_LEN], autn[EAP_AKA_AUTN_LEN];
	u8 auts[EAP_AKA_AUTS_LEN];

	int num_id_req, num_notification;
	u8 *pseudonym;
	size_t pseudonym_len;
	u8 *reauth_id;
	size_t reauth_id_len;
	int reauth;
	unsigned int counter, counter_too_small;
	u8 *last_eap_identity;
	size_t last_eap_identity_len;
	enum {
		CONTINUE, RESULT_SUCCESS, RESULT_FAILURE, SUCCESS, FAILURE
	} state;

	struct wpabuf *id_msgs;
	int prev_id;
	int result_ind, use_result_ind;
	u8 eap_method;
	u8 *network_name;
	size_t network_name_len;
	u16 kdf;
	int kdf_negotiation;
};


#ifndef CONFIG_NO_STDOUT_DEBUG
static const char * eap_aka_state_txt(int state)
{
	switch (state) {
	case CONTINUE:
		return "CONTINUE";
	case RESULT_SUCCESS:
		return "RESULT_SUCCESS";
	case RESULT_FAILURE:
		return "RESULT_FAILURE";
	case SUCCESS:
		return "SUCCESS";
	case FAILURE:
		return "FAILURE";
	default:
		return "?";
	}
}
#endif /* CONFIG_NO_STDOUT_DEBUG */


static void eap_aka_state(struct eap_aka_data *data, int state)
{
	wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s",
		   eap_aka_state_txt(data->state),
		   eap_aka_state_txt(state));
	data->state = state;
}


static void * eap_aka_init(struct eap_sm *sm)
{
	struct eap_aka_data *data;
	const char *phase1 = eap_get_config_phase1(sm);

	data = os_zalloc(sizeof(*data));
	if (data == NULL)
		return NULL;

	data->eap_method = EAP_TYPE_AKA;

	eap_aka_state(data, CONTINUE);
	data->prev_id = -1;

	data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;

	return data;
}


#ifdef EAP_AKA_PRIME
static void * eap_aka_prime_init(struct eap_sm *sm)
{
	struct eap_aka_data *data = eap_aka_init(sm);
	if (data == NULL)
		return NULL;
	data->eap_method = EAP_TYPE_AKA_PRIME;
	return data;
}
#endif /* EAP_AKA_PRIME */


static void eap_aka_deinit(struct eap_sm *sm, void *priv)
{
	struct eap_aka_data *data = priv;
	if (data) {
		os_free(data->pseudonym);
		os_free(data->reauth_id);
		os_free(data->last_eap_identity);
		wpabuf_free(data->id_msgs);
		os_free(data->network_name);
		os_free(data);
	}
}


static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
{
	struct eap_peer_config *conf;

	wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm");

	conf = eap_get_config(sm);
	if (conf == NULL)
		return -1;
	if (conf->pcsc) {
		return scard_umts_auth(sm->scard_ctx, data->rand,
				       data->autn, data->res, &data->res_len,
				       data->ik, data->ck, data->auts);
	}

#ifdef CONFIG_USIM_SIMULATOR
	if (conf->password) {
		u8 opc[16], k[16], sqn[6];
		const char *pos;
		wpa_printf(MSG_DEBUG, "EAP-AKA: Use internal Milenage "
			   "implementation for UMTS authentication");
		if (conf->password_len < 78) {
			wpa_printf(MSG_DEBUG, "EAP-AKA: invalid Milenage "
				   "password");
			return -1;
		}
		pos = (const char *) conf->password;
		if (hexstr2bin(pos, k, 16))
			return -1;
		pos += 32;
		if (*pos != ':')
			return -1;
		pos++;

		if (hexstr2bin(pos, opc, 16))
			return -1;
		pos += 32;
		if (*pos != ':')
			return -1;
		pos++;

		if (hexstr2bin(pos, sqn, 6))
			return -1;

		return milenage_check(opc, k, sqn, data->rand, data->autn,
				      data->ik, data->ck,
				      data->res, &data->res_len, data->auts);
	}
#endif /* CONFIG_USIM_SIMULATOR */

#ifdef CONFIG_USIM_HARDCODED
	wpa_printf(MSG_DEBUG, "EAP-AKA: Use hardcoded Kc and SRES values for "
		   "testing");

	/* These hardcoded Kc and SRES values are used for testing.
	 * Could consider making them configurable. */
	os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN);
	data->res_len = EAP_AKA_RES_MAX_LEN;
	os_memset(data->ik, '3', EAP_AKA_IK_LEN);
	os_memset(data->ck, '4', EAP_AKA_CK_LEN);
	{
		u8 autn[EAP_AKA_AUTN_LEN];
		os_memset(autn, '1', EAP_AKA_AUTN_LEN);
		if (os_memcmp(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) {
			wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match "
				   "with expected value");
			return -1;
		}
	}
#if 0
	{
		static int test_resync = 1;
		if (test_resync) {
			/* Test Resynchronization */
			test_resync = 0;
			return -2;
		}
	}
#endif
	return 0;

#else /* CONFIG_USIM_HARDCODED */

	wpa_printf(MSG_DEBUG, "EAP-AKA: No UMTS authentication algorith "
		   "enabled");
	return -1;

#endif /* CONFIG_USIM_HARDCODED */
}


#define CLEAR_PSEUDONYM	0x01
#define CLEAR_REAUTH_ID	0x02
#define CLEAR_EAP_ID	0x04

static void eap_aka_clear_identities(struct eap_aka_data *data, int id)
{
	wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old%s%s%s",
		   id & CLEAR_PSEUDONYM ? " pseudonym" : "",
		   id & CLEAR_REAUTH_ID ? " reauth_id" : "",
		   id & CLEAR_EAP_ID ? " eap_id" : "");
	if (id & CLEAR_PSEUDONYM) {
		os_free(data->pseudonym);
		data->pseudonym = NULL;
		data->pseudonym_len = 0;
	}
	if (id & CLEAR_REAUTH_ID) {
		os_free(data->reauth_id);
		data->reauth_id = NULL;
		data->reauth_id_len = 0;
	}
	if (id & CLEAR_EAP_ID) {
		os_free(data->last_eap_identity);
		data->last_eap_identity = NULL;
		data->last_eap_identity_len = 0;
	}
}


static int eap_aka_learn_ids(struct eap_aka_data *data,
			     struct eap_sim_attrs *attr)
{
	if (attr->next_pseudonym) {
		os_free(data->pseudonym);
		data->pseudonym = os_malloc(attr->next_pseudonym_len);
		if (data->pseudonym == NULL) {
			wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
				   "next pseudonym");
			return -1;
		}
		os_memcpy(data->pseudonym, attr->next_pseudonym,
			  attr->next_pseudonym_len);
		data->pseudonym_len = attr->next_pseudonym_len;
		wpa_hexdump_ascii(MSG_DEBUG,
				  "EAP-AKA: (encr) AT_NEXT_PSEUDONYM",
				  data->pseudonym,
				  data->pseudonym_len);
	}

	if (attr->next_reauth_id) {
		os_free(data->reauth_id);
		data->reauth_id = os_malloc(attr->next_reauth_id_len);
		if (data->reauth_id == NULL) {
			wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
				   "next reauth_id");
			return -1;
		}
		os_memcpy(data->reauth_id, attr->next_reauth_id,
			  attr->next_reauth_id_len);
		data->reauth_id_len = attr->next_reauth_id_len;
		wpa_hexdump_ascii(MSG_DEBUG,
				  "EAP-AKA: (encr) AT_NEXT_REAUTH_ID",
				  data->reauth_id,
				  data->reauth_id_len);
	}

	return 0;
}


static int eap_aka_add_id_msg(struct eap_aka_data *data,
			      const struct wpabuf *msg)
{
	if (msg == NULL)
		return -1;

	if (data->id_msgs == NULL) {
		data->id_msgs = wpabuf_dup(msg);
		return data->id_msgs == NULL ? -1 : 0;
	}

	if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
		return -1;
	wpabuf_put_buf(data->id_msgs, msg);

	return 0;
}


static void eap_aka_add_checkcode(struct eap_aka_data *data,
				  struct eap_sim_msg *msg)
{
	const u8 *addr;
	size_t len;
	u8 hash[SHA256_MAC_LEN];

	wpa_printf(MSG_DEBUG, "   AT_CHECKCODE");

	if (data->id_msgs == NULL) {
		/*
		 * No EAP-AKA/Identity packets were exchanged - send empty
		 * checkcode.
		 */
		eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
		return;
	}

	/* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
	addr = wpabuf_head(data->id_msgs);
	len = wpabuf_len(data->id_msgs);
	wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
#ifdef EAP_AKA_PRIME
	if (data->eap_method == EAP_TYPE_AKA_PRIME)
		sha256_vector(1, &addr, &len, hash);
	else
#endif /* EAP_AKA_PRIME */
		sha1_vector(1, &addr, &len, hash);

	eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
			data->eap_method == EAP_TYPE_AKA_PRIME ?
			EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
}


static int eap_aka_verify_checkcode(struct eap_aka_data *data,
				    const u8 *checkcode, size_t checkcode_len)
{
	const u8 *addr;
	size_t len;
	u8 hash[SHA256_MAC_LEN];
	size_t hash_len;

	if (checkcode == NULL)
		return -1;

	if (data->id_msgs == NULL) {
		if (checkcode_len != 0) {
			wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
				   "indicates that AKA/Identity messages were "
				   "used, but they were not");
			return -1;
		}
		return 0;
	}

	hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
		EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;

	if (checkcode_len != hash_len) {
		wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
			   "indicates that AKA/Identity message were not "
			   "used, but they were");
		return -1;
	}

	/* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
	addr = wpabuf_head(data->id_msgs);
	len = wpabuf_len(data->id_msgs);
#ifdef EAP_AKA_PRIME
	if (data->eap_method == EAP_TYPE_AKA_PRIME)
		sha256_vector(1, &addr, &len, hash);
	else
#endif /* EAP_AKA_PRIME */
		sha1_vector(1, &addr, &len, hash);

	if (os_memcmp(hash, checkcode, hash_len) != 0) {
		wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
		return -1;
	}

	return 0;
}


static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id,
					    int err)
{
	struct eap_sim_msg *msg;

	eap_aka_state(data, FAILURE);
	data->num_id_req = 0;
	data->num_notification = 0;

	msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
			       EAP_AKA_SUBTYPE_CLIENT_ERROR);
	eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
	return eap_sim_msg_finish(msg, NULL, NULL, 0);
}


static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data,
						     u8 id)
{
	struct eap_sim_msg *msg;

	eap_aka_state(data, FAILURE);
	data->num_id_req = 0;
	data->num_notification = 0;

	wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
		   "(id=%d)", id);
	msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
			       EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
	return eap_sim_msg_finish(msg, NULL, NULL, 0);
}


static struct wpabuf * eap_aka_synchronization_failure(
	struct eap_aka_data *data, u8 id)
{
	struct eap_sim_msg *msg;

	data->num_id_req = 0;
	data->num_notification = 0;

	wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
		   "(id=%d)", id);
	msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
			       EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
	wpa_printf(MSG_DEBUG, "   AT_AUTS");
	eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
			     EAP_AKA_AUTS_LEN);
	return eap_sim_msg_finish(msg, NULL, NULL, 0);
}


static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
						 struct eap_aka_data *data,
						 u8 id,
						 enum eap_sim_id_req id_req)
{
	const u8 *identity = NULL;