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1019 lines
29 KiB
C
1019 lines
29 KiB
C
/*
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* WPA Supplicant / EAP-SIM (draft-haverinen-pppext-eap-sim-13.txt)
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* Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "common.h"
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#include "eap_i.h"
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#include "wpa_supplicant.h"
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#include "config_ssid.h"
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#include "crypto.h"
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#include "pcsc_funcs.h"
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#include "eap_sim_common.h"
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#define EAP_SIM_VERSION 1
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/* EAP-SIM Subtypes */
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#define EAP_SIM_SUBTYPE_START 10
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#define EAP_SIM_SUBTYPE_CHALLENGE 11
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#define EAP_SIM_SUBTYPE_NOTIFICATION 12
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#define EAP_SIM_SUBTYPE_REAUTHENTICATION 13
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#define EAP_SIM_SUBTYPE_CLIENT_ERROR 14
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/* AT_CLIENT_ERROR_CODE error codes */
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#define EAP_SIM_UNABLE_TO_PROCESS_PACKET 0
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#define EAP_SIM_UNSUPPORTED_VERSION 1
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#define EAP_SIM_INSUFFICIENT_NUM_OF_CHAL 2
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#define EAP_SIM_RAND_NOT_FRESH 3
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#define KC_LEN 8
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#define SRES_LEN 4
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#define EAP_SIM_MAX_FAST_REAUTHS 1000
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struct eap_sim_data {
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u8 *ver_list;
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size_t ver_list_len;
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int selected_version;
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int min_num_chal, num_chal;
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u8 kc[3][KC_LEN];
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u8 sres[3][SRES_LEN];
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u8 nonce_mt[EAP_SIM_NONCE_MT_LEN], nonce_s[EAP_SIM_NONCE_S_LEN];
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u8 mk[EAP_SIM_MK_LEN];
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u8 k_aut[EAP_SIM_K_AUT_LEN];
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u8 k_encr[EAP_SIM_K_ENCR_LEN];
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u8 msk[EAP_SIM_KEYING_DATA_LEN];
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u8 rand[3][GSM_RAND_LEN];
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int num_id_req, num_notification;
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u8 *pseudonym;
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size_t pseudonym_len;
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u8 *reauth_id;
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size_t reauth_id_len;
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int reauth;
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unsigned int counter, counter_too_small;
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u8 *last_eap_identity;
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size_t last_eap_identity_len;
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enum { CONTINUE, SUCCESS, FAILURE } state;
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};
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static void * eap_sim_init(struct eap_sm *sm)
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{
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struct eap_sim_data *data;
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struct wpa_ssid *config = eap_get_config(sm);
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data = malloc(sizeof(*data));
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if (data == NULL)
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return NULL;
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memset(data, 0, sizeof(*data));
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if (hostapd_get_rand(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
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wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
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"for NONCE_MT");
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free(data);
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return NULL;
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}
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data->min_num_chal = 2;
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if (config && config->phase1) {
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char *pos = strstr(config->phase1, "sim_min_num_chal=");
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if (pos) {
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data->min_num_chal = atoi(pos + 17);
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if (data->min_num_chal < 2 || data->min_num_chal > 3) {
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wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
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"sim_min_num_chal configuration "
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"(%d, expected 2 or 3)",
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data->min_num_chal);
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free(data);
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return NULL;
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}
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wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of "
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"challenges to %d", data->min_num_chal);
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}
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}
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data->state = CONTINUE;
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return data;
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}
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static void eap_sim_deinit(struct eap_sm *sm, void *priv)
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{
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struct eap_sim_data *data = priv;
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if (data) {
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free(data->ver_list);
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free(data->pseudonym);
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free(data->reauth_id);
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free(data->last_eap_identity);
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free(data);
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}
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}
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static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
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{
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wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
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#ifdef PCSC_FUNCS
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if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
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data->sres[0], data->kc[0]) ||
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scard_gsm_auth(sm->scard_ctx, data->rand[1],
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data->sres[1], data->kc[1]) ||
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(data->num_chal > 2 &&
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scard_gsm_auth(sm->scard_ctx, data->rand[2],
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data->sres[2], data->kc[2]))) {
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wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM authentication could "
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"not be completed");
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return -1;
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}
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#else /* PCSC_FUNCS */
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/* These hardcoded Kc and SRES values are used for testing. RAND to
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* KC/SREC mapping is very bogus as far as real authentication is
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* concerned, but it is quite useful for cases where the AS is rotating
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* the order of pre-configured values. */
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{
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int i;
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for (i = 0; i < data->num_chal; i++) {
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if (data->rand[i][0] == 0xaa) {
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memcpy(data->kc[i],
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"\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
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KC_LEN);
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memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
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SRES_LEN);
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} else if (data->rand[i][0] == 0xbb) {
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memcpy(data->kc[i],
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"\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
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KC_LEN);
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memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
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SRES_LEN);
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} else {
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memcpy(data->kc[i],
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"\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
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KC_LEN);
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memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
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SRES_LEN);
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}
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}
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}
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#endif /* PCSC_FUNCS */
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return 0;
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}
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static int eap_sim_supported_ver(struct eap_sim_data *data, int version)
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{
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return version == EAP_SIM_VERSION;
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}
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static void eap_sim_derive_mk(struct eap_sim_data *data,
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const u8 *identity, size_t identity_len)
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{
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u8 sel_ver[2];
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const unsigned char *addr[5];
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size_t len[5];
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addr[0] = identity;
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len[0] = identity_len;
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addr[1] = (u8 *) data->kc;
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len[1] = data->num_chal * KC_LEN;
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addr[2] = data->nonce_mt;
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len[2] = EAP_SIM_NONCE_MT_LEN;
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addr[3] = data->ver_list;
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len[3] = data->ver_list_len;
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addr[4] = sel_ver;
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len[4] = 2;
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WPA_PUT_BE16(sel_ver, data->selected_version);
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/* MK = SHA1(Identity|n*Kc|NONCE_MT|Version List|Selected Version) */
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sha1_vector(5, addr, len, data->mk);
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wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: MK", data->mk, EAP_SIM_MK_LEN);
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}
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#define CLEAR_PSEUDONYM 0x01
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#define CLEAR_REAUTH_ID 0x02
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#define CLEAR_EAP_ID 0x04
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static void eap_sim_clear_identities(struct eap_sim_data *data, int id)
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{
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wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old%s%s%s",
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id & CLEAR_PSEUDONYM ? " pseudonym" : "",
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id & CLEAR_REAUTH_ID ? " reauth_id" : "",
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id & CLEAR_EAP_ID ? " eap_id" : "");
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if (id & CLEAR_PSEUDONYM) {
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free(data->pseudonym);
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data->pseudonym = NULL;
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data->pseudonym_len = 0;
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}
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if (id & CLEAR_REAUTH_ID) {
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free(data->reauth_id);
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data->reauth_id = NULL;
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data->reauth_id_len = 0;
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}
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if (id & CLEAR_EAP_ID) {
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free(data->last_eap_identity);
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data->last_eap_identity = NULL;
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data->last_eap_identity_len = 0;
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}
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}
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static int eap_sim_learn_ids(struct eap_sim_data *data,
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struct eap_sim_attrs *attr)
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{
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if (attr->next_pseudonym) {
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free(data->pseudonym);
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data->pseudonym = malloc(attr->next_pseudonym_len);
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if (data->pseudonym == NULL) {
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wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
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"next pseudonym");
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return -1;
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}
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memcpy(data->pseudonym, attr->next_pseudonym,
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attr->next_pseudonym_len);
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data->pseudonym_len = attr->next_pseudonym_len;
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wpa_hexdump_ascii(MSG_DEBUG,
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"EAP-SIM: (encr) AT_NEXT_PSEUDONYM",
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data->pseudonym,
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data->pseudonym_len);
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}
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if (attr->next_reauth_id) {
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free(data->reauth_id);
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data->reauth_id = malloc(attr->next_reauth_id_len);
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if (data->reauth_id == NULL) {
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wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
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"next reauth_id");
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return -1;
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}
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memcpy(data->reauth_id, attr->next_reauth_id,
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attr->next_reauth_id_len);
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data->reauth_id_len = attr->next_reauth_id_len;
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wpa_hexdump_ascii(MSG_DEBUG,
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"EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
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data->reauth_id,
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data->reauth_id_len);
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}
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return 0;
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}
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static u8 * eap_sim_client_error(struct eap_sm *sm, struct eap_sim_data *data,
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const struct eap_hdr *req,
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size_t *respDataLen, int err)
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{
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struct eap_sim_msg *msg;
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data->state = FAILURE;
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data->num_id_req = 0;
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data->num_notification = 0;
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msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
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EAP_TYPE_SIM, EAP_SIM_SUBTYPE_CLIENT_ERROR);
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eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
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return eap_sim_msg_finish(msg, respDataLen, NULL, NULL, 0);
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}
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static u8 * eap_sim_response_start(struct eap_sm *sm,
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struct eap_sim_data *data,
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const struct eap_hdr *req,
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size_t *respDataLen,
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enum eap_sim_id_req id_req)
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{
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struct wpa_ssid *config = eap_get_config(sm);
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u8 *identity = NULL;
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size_t identity_len = 0;
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struct eap_sim_msg *msg;
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data->reauth = 0;
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if (id_req == ANY_ID && data->reauth_id) {
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identity = data->reauth_id;
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identity_len = data->reauth_id_len;
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data->reauth = 1;
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} else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
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data->pseudonym) {
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identity = data->pseudonym;
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identity_len = data->pseudonym_len;
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eap_sim_clear_identities(data, CLEAR_REAUTH_ID);
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} else if (id_req != NO_ID_REQ && config && config->identity) {
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identity = config->identity;
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identity_len = config->identity_len;
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eap_sim_clear_identities(data,
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CLEAR_PSEUDONYM | CLEAR_REAUTH_ID);
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}
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if (id_req != NO_ID_REQ)
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eap_sim_clear_identities(data, CLEAR_EAP_ID);
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wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)",
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req->identifier);
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msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
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EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
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wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
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data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
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eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
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data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
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wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
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data->selected_version);
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eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
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data->selected_version, NULL, 0);
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if (identity) {
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wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
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identity, identity_len);
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eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
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identity, identity_len);
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}
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return eap_sim_msg_finish(msg, respDataLen, NULL, NULL, 0);
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}
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static u8 * eap_sim_response_challenge(struct eap_sm *sm,
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struct eap_sim_data *data,
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const struct eap_hdr *req,
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size_t *respDataLen)
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{
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struct eap_sim_msg *msg;
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wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)",
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req->identifier);
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msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
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EAP_TYPE_SIM, EAP_SIM_SUBTYPE_CHALLENGE);
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wpa_printf(MSG_DEBUG, " AT_MAC");
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eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
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return eap_sim_msg_finish(msg, respDataLen, data->k_aut,
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(u8 *) data->sres,
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data->num_chal * SRES_LEN);
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}
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static u8 * eap_sim_response_reauth(struct eap_sm *sm,
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struct eap_sim_data *data,
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const struct eap_hdr *req,
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size_t *respDataLen, int counter_too_small)
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{
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struct eap_sim_msg *msg;
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unsigned int counter;
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wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
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req->identifier);
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msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
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EAP_TYPE_SIM,
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EAP_SIM_SUBTYPE_REAUTHENTICATION);
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wpa_printf(MSG_DEBUG, " AT_IV");
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wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
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eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
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if (counter_too_small) {
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wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
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eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
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counter = data->counter_too_small;
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} else
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counter = data->counter;
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wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
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eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
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if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
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wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
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"AT_ENCR_DATA");
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eap_sim_msg_free(msg);
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return NULL;
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}
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wpa_printf(MSG_DEBUG, " AT_MAC");
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eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
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return eap_sim_msg_finish(msg, respDataLen, data->k_aut, data->nonce_s,
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EAP_SIM_NONCE_S_LEN);
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}
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static u8 * eap_sim_response_notification(struct eap_sm *sm,
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struct eap_sim_data *data,
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const struct eap_hdr *req,
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size_t *respDataLen,
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u16 notification)
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{
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struct eap_sim_msg *msg;
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u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
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wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)",
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req->identifier);
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msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
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EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
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wpa_printf(MSG_DEBUG, " AT_NOTIFICATION");
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eap_sim_msg_add(msg, EAP_SIM_AT_NOTIFICATION, notification, NULL, 0);
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if (k_aut && data->reauth) {
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wpa_printf(MSG_DEBUG, " AT_IV");
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wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
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eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
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EAP_SIM_AT_ENCR_DATA);
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wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
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eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
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NULL, 0);
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if (eap_sim_msg_add_encr_end(msg, data->k_encr,
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EAP_SIM_AT_PADDING)) {
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wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
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"AT_ENCR_DATA");
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eap_sim_msg_free(msg);
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return NULL;
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}
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}
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if (k_aut) {
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wpa_printf(MSG_DEBUG, " AT_MAC");
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eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
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}
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return eap_sim_msg_finish(msg, respDataLen, k_aut, (u8 *) "", 0);
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}
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static u8 * eap_sim_process_start(struct eap_sm *sm, struct eap_sim_data *data,
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const struct eap_hdr *req, size_t reqDataLen,
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size_t *respDataLen,
|
|
struct eap_sim_attrs *attr)
|
|
{
|
|
int i, selected_version = -1, id_error;
|
|
u8 *pos;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
|
|
if (attr->version_list == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
|
|
"SIM/Start");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNSUPPORTED_VERSION);
|
|
}
|
|
|
|
free(data->ver_list);
|
|
data->ver_list = malloc(attr->version_list_len);
|
|
if (data->ver_list == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
|
|
"memory for version list");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
memcpy(data->ver_list, attr->version_list, attr->version_list_len);
|
|
data->ver_list_len = attr->version_list_len;
|
|
pos = data->ver_list;
|
|
for (i = 0; i < data->ver_list_len / 2; i++) {
|
|
int ver = pos[0] * 256 + pos[1];
|
|
pos += 2;
|
|
if (eap_sim_supported_ver(data, ver)) {
|
|
selected_version = ver;
|
|
break;
|
|
}
|
|
}
|
|
if (selected_version < 0) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
|
|
"version");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNSUPPORTED_VERSION);
|
|
}
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
|
|
selected_version);
|
|
data->selected_version = selected_version;
|
|
|
|
id_error = 0;
|
|
switch (attr->id_req) {
|
|
case NO_ID_REQ:
|
|
break;
|
|
case ANY_ID:
|
|
if (data->num_id_req > 0)
|
|
id_error++;
|
|
data->num_id_req++;
|
|
break;
|
|
case FULLAUTH_ID:
|
|
if (data->num_id_req > 1)
|
|
id_error++;
|
|
data->num_id_req++;
|
|
break;
|
|
case PERMANENT_ID:
|
|
if (data->num_id_req > 2)
|
|
id_error++;
|
|
data->num_id_req++;
|
|
break;
|
|
}
|
|
if (id_error) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
|
|
"used within one authentication");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
return eap_sim_response_start(sm, data, req, respDataLen,
|
|
attr->id_req);
|
|
}
|
|
|
|
|
|
static u8 * eap_sim_process_challenge(struct eap_sm *sm,
|
|
struct eap_sim_data *data,
|
|
const struct eap_hdr *req,
|
|
size_t reqDataLen,
|
|
size_t *respDataLen,
|
|
struct eap_sim_attrs *attr)
|
|
{
|
|
struct wpa_ssid *config = eap_get_config(sm);
|
|
u8 *identity;
|
|
size_t identity_len;
|
|
struct eap_sim_attrs eattr;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
|
|
data->reauth = 0;
|
|
if (!attr->mac || !attr->rand) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
|
|
"did not include%s%s",
|
|
!attr->mac ? " AT_MAC" : "",
|
|
!attr->rand ? " AT_RAND" : "");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
|
|
(unsigned long) attr->num_chal);
|
|
if (attr->num_chal < data->min_num_chal) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
|
|
"challenges (%lu)", (unsigned long) attr->num_chal);
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
|
|
}
|
|
if (attr->num_chal > 3) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
|
|
"(%lu)", (unsigned long) attr->num_chal);
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
/* Verify that RANDs are different */
|
|
if (memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
|
|
GSM_RAND_LEN) == 0 ||
|
|
(attr->num_chal > 2 &&
|
|
(memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
|
|
GSM_RAND_LEN) == 0 ||
|
|
memcmp(attr->rand + GSM_RAND_LEN,
|
|
attr->rand + 2 * GSM_RAND_LEN,
|
|
GSM_RAND_LEN) == 0))) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_RAND_NOT_FRESH);
|
|
}
|
|
|
|
memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
|
|
data->num_chal = attr->num_chal;
|
|
|
|
if (eap_sim_gsm_auth(sm, data)) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
if (data->last_eap_identity) {
|
|
identity = data->last_eap_identity;
|
|
identity_len = data->last_eap_identity_len;
|
|
} else if (data->pseudonym) {
|
|
identity = data->pseudonym;
|
|
identity_len = data->pseudonym_len;
|
|
} else {
|
|
identity = config->identity;
|
|
identity_len = config->identity_len;
|
|
}
|
|
wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
|
|
"derivation", identity, identity_len);
|
|
eap_sim_derive_mk(data, identity, identity_len);
|
|
eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk);
|
|
if (eap_sim_verify_mac(data->k_aut, (const u8 *) req, reqDataLen,
|
|
attr->mac, data->nonce_mt,
|
|
EAP_SIM_NONCE_MT_LEN)) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
|
|
"used invalid AT_MAC");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
/* Old reauthentication and pseudonym identities must not be used
|
|
* anymore. In other words, if no new identities are received, full
|
|
* authentication will be used on next reauthentication. */
|
|
eap_sim_clear_identities(data, CLEAR_PSEUDONYM | CLEAR_REAUTH_ID |
|
|
CLEAR_EAP_ID);
|
|
|
|
if (attr->encr_data) {
|
|
u8 *decrypted;
|
|
decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
|
|
attr->encr_data_len, attr->iv,
|
|
&eattr, 0);
|
|
if (decrypted == NULL) {
|
|
return eap_sim_client_error(
|
|
sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
eap_sim_learn_ids(data, &eattr);
|
|
free(decrypted);
|
|
}
|
|
|
|
if (data->state != FAILURE)
|
|
data->state = SUCCESS;
|
|
|
|
data->num_id_req = 0;
|
|
data->num_notification = 0;
|
|
/* draft-haverinen-pppext-eap-sim-13.txt specifies that counter
|
|
* is initialized to one after fullauth, but initializing it to
|
|
* zero makes it easier to implement reauth verification. */
|
|
data->counter = 0;
|
|
return eap_sim_response_challenge(sm, data, req, respDataLen);
|
|
}
|
|
|
|
|
|
static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
|
|
const struct eap_hdr *req,
|
|
size_t reqDataLen,
|
|
struct eap_sim_attrs *attr)
|
|
{
|
|
struct eap_sim_attrs eattr;
|
|
u8 *decrypted;
|
|
|
|
if (attr->encr_data == NULL || attr->iv == NULL) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
|
|
"reauth did not include encrypted data");
|
|
return -1;
|
|
}
|
|
|
|
decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
|
|
attr->encr_data_len, attr->iv, &eattr,
|
|
0);
|
|
if (decrypted == NULL) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
|
|
"data from notification message");
|
|
return -1;
|
|
}
|
|
|
|
if (eattr.counter != data->counter) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
|
|
"message does not match with counter in reauth "
|
|
"message");
|
|
free(decrypted);
|
|
return -1;
|
|
}
|
|
|
|
free(decrypted);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int eap_sim_process_notification_auth(struct eap_sim_data *data,
|
|
const struct eap_hdr *req,
|
|
size_t reqDataLen,
|
|
struct eap_sim_attrs *attr)
|
|
{
|
|
if (attr->mac == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
|
|
"Notification message");
|
|
return -1;
|
|
}
|
|
|
|
if (eap_sim_verify_mac(data->k_aut, (u8 *) req, reqDataLen, attr->mac,
|
|
(u8 *) "", 0)) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
|
|
"used invalid AT_MAC");
|
|
return -1;
|
|
}
|
|
|
|
if (data->reauth &&
|
|
eap_sim_process_notification_reauth(data, req, reqDataLen, attr)) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
|
|
"message after reauth");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static u8 * eap_sim_process_notification(struct eap_sm *sm,
|
|
struct eap_sim_data *data,
|
|
const struct eap_hdr *req,
|
|
size_t reqDataLen,
|
|
size_t *respDataLen,
|
|
struct eap_sim_attrs *attr)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
|
|
if (data->num_notification > 0) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
|
|
"rounds (only one allowed)");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
data->num_notification++;
|
|
if (attr->notification == -1) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
|
|
"Notification message");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
if ((attr->notification & 0x4000) == 0 &&
|
|
eap_sim_process_notification_auth(data, req, reqDataLen, attr)) {
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
|
|
if (attr->notification >= 0 && attr->notification < 32768) {
|
|
data->state = FAILURE;
|
|
}
|
|
return eap_sim_response_notification(sm, data, req, respDataLen,
|
|
attr->notification);
|
|
}
|
|
|
|
|
|
static u8 * eap_sim_process_reauthentication(struct eap_sm *sm,
|
|
struct eap_sim_data *data,
|
|
const struct eap_hdr *req,
|
|
size_t reqDataLen,
|
|
size_t *respDataLen,
|
|
struct eap_sim_attrs *attr)
|
|
{
|
|
struct eap_sim_attrs eattr;
|
|
u8 *decrypted;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
|
|
|
|
if (data->reauth_id == NULL) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
|
|
"reauthentication, but no reauth_id available");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
data->reauth = 1;
|
|
if (eap_sim_verify_mac(data->k_aut, (const u8 *) req, reqDataLen,
|
|
attr->mac, (u8 *) "", 0)) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
|
|
"did not have valid AT_MAC");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
if (attr->encr_data == NULL || attr->iv == NULL) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
|
|
"message did not include encrypted data");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
|
|
attr->encr_data_len, attr->iv, &eattr,
|
|
0);
|
|
if (decrypted == NULL) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
|
|
"data from reauthentication message");
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
if (eattr.nonce_s == NULL || eattr.counter < 0) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
|
|
!eattr.nonce_s ? " AT_NONCE_S" : "",
|
|
eattr.counter < 0 ? " AT_COUNTER" : "");
|
|
free(decrypted);
|
|
return eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
}
|
|
|
|
if (eattr.counter <= data->counter) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
|
|
"(%d <= %d)", eattr.counter, data->counter);
|
|
data->counter_too_small = eattr.counter;
|
|
/* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
|
|
* reauth_id must not be used to start a new reauthentication.
|
|
* However, since it was used in the last EAP-Response-Identity
|
|
* packet, it has to saved for the following fullauth to be
|
|
* used in MK derivation. */
|
|
free(data->last_eap_identity);
|
|
data->last_eap_identity = data->reauth_id;
|
|
data->last_eap_identity_len = data->reauth_id_len;
|
|
data->reauth_id = NULL;
|
|
data->reauth_id_len = 0;
|
|
free(decrypted);
|
|
return eap_sim_response_reauth(sm, data, req, respDataLen, 1);
|
|
}
|
|
data->counter = eattr.counter;
|
|
|
|
memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
|
|
data->nonce_s, EAP_SIM_NONCE_S_LEN);
|
|
|
|
eap_sim_derive_keys_reauth(data->counter,
|
|
data->reauth_id, data->reauth_id_len,
|
|
data->nonce_s, data->mk, data->msk);
|
|
eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
|
|
eap_sim_learn_ids(data, &eattr);
|
|
|
|
if (data->state != FAILURE)
|
|
data->state = SUCCESS;
|
|
|
|
data->num_id_req = 0;
|
|
data->num_notification = 0;
|
|
if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
|
|
"fast reauths performed - force fullauth");
|
|
eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
|
|
}
|
|
free(decrypted);
|
|
return eap_sim_response_reauth(sm, data, req, respDataLen, 0);
|
|
}
|
|
|
|
|
|
static u8 * eap_sim_process(struct eap_sm *sm, void *priv,
|
|
struct eap_method_ret *ret,
|
|
const u8 *reqData, size_t reqDataLen,
|
|
size_t *respDataLen)
|
|
{
|
|
struct eap_sim_data *data = priv;
|
|
struct wpa_ssid *config = eap_get_config(sm);
|
|
const struct eap_hdr *req;
|
|
u8 subtype, *res;
|
|
const u8 *pos;
|
|
struct eap_sim_attrs attr;
|
|
size_t len;
|
|
|
|
wpa_hexdump(MSG_DEBUG, "EAP-SIM: EAP data", reqData, reqDataLen);
|
|
if (config == NULL || config->identity == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
|
|
eap_sm_request_identity(sm, config);
|
|
ret->ignore = TRUE;
|
|
return NULL;
|
|
}
|
|
|
|
pos = eap_hdr_validate(EAP_TYPE_SIM, reqData, reqDataLen, &len);
|
|
if (pos == NULL || len < 1) {
|
|
ret->ignore = TRUE;
|
|
return NULL;
|
|
}
|
|
req = (const struct eap_hdr *) reqData;
|
|
len = be_to_host16(req->length);
|
|
|
|
ret->ignore = FALSE;
|
|
ret->methodState = METHOD_MAY_CONT;
|
|
ret->decision = DECISION_FAIL;
|
|
ret->allowNotifications = TRUE;
|
|
|
|
subtype = *pos++;
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
|
|
pos += 2; /* Reserved */
|
|
|
|
if (eap_sim_parse_attr(pos, reqData + len, &attr, 0, 0)) {
|
|
res = eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
goto done;
|
|
}
|
|
|
|
switch (subtype) {
|
|
case EAP_SIM_SUBTYPE_START:
|
|
res = eap_sim_process_start(sm, data, req, len,
|
|
respDataLen, &attr);
|
|
break;
|
|
case EAP_SIM_SUBTYPE_CHALLENGE:
|
|
res = eap_sim_process_challenge(sm, data, req, len,
|
|
respDataLen, &attr);
|
|
break;
|
|
case EAP_SIM_SUBTYPE_NOTIFICATION:
|
|
res = eap_sim_process_notification(sm, data, req, len,
|
|
respDataLen, &attr);
|
|
break;
|
|
case EAP_SIM_SUBTYPE_REAUTHENTICATION:
|
|
res = eap_sim_process_reauthentication(sm, data, req, len,
|
|
respDataLen, &attr);
|
|
break;
|
|
case EAP_SIM_SUBTYPE_CLIENT_ERROR:
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
|
|
res = eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
|
|
res = eap_sim_client_error(sm, data, req, respDataLen,
|
|
EAP_SIM_UNABLE_TO_PROCESS_PACKET);
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (data->state == FAILURE) {
|
|
ret->decision = DECISION_FAIL;
|
|
ret->methodState = METHOD_DONE;
|
|
} else if (data->state == SUCCESS) {
|
|
ret->decision = DECISION_COND_SUCC;
|
|
ret->methodState = METHOD_DONE;
|
|
}
|
|
|
|
if (ret->methodState == METHOD_DONE) {
|
|
ret->allowNotifications = FALSE;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
static Boolean eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_sim_data *data = priv;
|
|
return data->pseudonym || data->reauth_id;
|
|
}
|
|
|
|
|
|
static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_sim_data *data = priv;
|
|
eap_sim_clear_identities(data, CLEAR_EAP_ID);
|
|
}
|
|
|
|
|
|
static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_sim_data *data = priv;
|
|
if (hostapd_get_rand(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
|
|
wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
|
|
"for NONCE_MT");
|
|
free(data);
|
|
return NULL;
|
|
}
|
|
data->num_id_req = 0;
|
|
data->num_notification = 0;
|
|
data->state = CONTINUE;
|
|
return priv;
|
|
}
|
|
|
|
|
|
static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
|
|
size_t *len)
|
|
{
|
|
struct eap_sim_data *data = priv;
|
|
|
|
if (data->reauth_id) {
|
|
*len = data->reauth_id_len;
|
|
return data->reauth_id;
|
|
}
|
|
|
|
if (data->pseudonym) {
|
|
*len = data->pseudonym_len;
|
|
return data->pseudonym;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static Boolean eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_sim_data *data = priv;
|
|
return data->state == SUCCESS;
|
|
}
|
|
|
|
|
|
static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
|
|
{
|
|
struct eap_sim_data *data = priv;
|
|
u8 *key;
|
|
|
|
if (data->state != SUCCESS)
|
|
return NULL;
|
|
|
|
key = malloc(EAP_SIM_KEYING_DATA_LEN);
|
|
if (key == NULL)
|
|
return NULL;
|
|
|
|
*len = EAP_SIM_KEYING_DATA_LEN;
|
|
memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
|
|
|
|
return key;
|
|
}
|
|
|
|
|
|
const struct eap_method eap_method_sim =
|
|
{
|
|
.method = EAP_TYPE_SIM,
|
|
.name = "SIM",
|
|
.init = eap_sim_init,
|
|
.deinit = eap_sim_deinit,
|
|
.process = eap_sim_process,
|
|
.isKeyAvailable = eap_sim_isKeyAvailable,
|
|
.getKey = eap_sim_getKey,
|
|
.has_reauth_data = eap_sim_has_reauth_data,
|
|
.deinit_for_reauth = eap_sim_deinit_for_reauth,
|
|
.init_for_reauth = eap_sim_init_for_reauth,
|
|
.get_identity = eap_sim_get_identity,
|
|
};
|