+++ /dev/null
-/*
- * EAP peer method: EAP-SIM (RFC 4186)
- * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
- *
- * 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 "pcsc_funcs.h"
-#include "crypto/milenage.h"
-#include "eap_peer/eap_i.h"
-#include "eap_config.h"
-#include "eap_common/eap_sim_common.h"
-
-
-struct eap_sim_data {
- u8 *ver_list;
- size_t ver_list_len;
- int selected_version;
- size_t min_num_chal, num_chal;
-
- u8 kc[3][EAP_SIM_KC_LEN];
- u8 sres[3][EAP_SIM_SRES_LEN];
- u8 nonce_mt[EAP_SIM_NONCE_MT_LEN], nonce_s[EAP_SIM_NONCE_S_LEN];
- u8 mk[EAP_SIM_MK_LEN];
- u8 k_aut[EAP_SIM_K_AUT_LEN];
- u8 k_encr[EAP_SIM_K_ENCR_LEN];
- u8 msk[EAP_SIM_KEYING_DATA_LEN];
- u8 emsk[EAP_EMSK_LEN];
- u8 rand[3][GSM_RAND_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;
- int result_ind, use_result_ind;
-};
-
-
-#ifndef CONFIG_NO_STDOUT_DEBUG
-static const char * eap_sim_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_sim_state(struct eap_sim_data *data, int state)
-{
- wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s",
- eap_sim_state_txt(data->state),
- eap_sim_state_txt(state));
- data->state = state;
-}
-
-
-static void * eap_sim_init(struct eap_sm *sm)
-{
- struct eap_sim_data *data;
- struct eap_peer_config *config = eap_get_config(sm);
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
-
- if (os_get_random(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
- wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
- "for NONCE_MT");
- os_free(data);
- return NULL;
- }
-
- data->min_num_chal = 2;
- if (config && config->phase1) {
- char *pos = os_strstr(config->phase1, "sim_min_num_chal=");
- if (pos) {
- data->min_num_chal = atoi(pos + 17);
- if (data->min_num_chal < 2 || data->min_num_chal > 3) {
- wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
- "sim_min_num_chal configuration "
- "(%lu, expected 2 or 3)",
- (unsigned long) data->min_num_chal);
- os_free(data);
- return NULL;
- }
- wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of "
- "challenges to %lu",
- (unsigned long) data->min_num_chal);
- }
-
- data->result_ind = os_strstr(config->phase1, "result_ind=1") !=
- NULL;
- }
-
- eap_sim_state(data, CONTINUE);
-
- return data;
-}
-
-
-static void eap_sim_deinit(struct eap_sm *sm, void *priv)
-{
- struct eap_sim_data *data = priv;
- if (data) {
- os_free(data->ver_list);
- os_free(data->pseudonym);
- os_free(data->reauth_id);
- os_free(data->last_eap_identity);
- os_free(data);
- }
-}
-
-
-static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
-{
- struct eap_peer_config *conf;
-
- wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
-
- conf = eap_get_config(sm);
- if (conf == NULL)
- return -1;
- if (conf->pcsc) {
- if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
- data->sres[0], data->kc[0]) ||
- scard_gsm_auth(sm->scard_ctx, data->rand[1],
- data->sres[1], data->kc[1]) ||
- (data->num_chal > 2 &&
- scard_gsm_auth(sm->scard_ctx, data->rand[2],
- data->sres[2], data->kc[2]))) {
- wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM "
- "authentication could not be completed");
- return -1;
- }
- return 0;
- }
-
-#ifdef CONFIG_SIM_SIMULATOR
- if (conf->password) {
- u8 opc[16], k[16];
- const char *pos;
- size_t i;
- wpa_printf(MSG_DEBUG, "EAP-SIM: Use internal GSM-Milenage "
- "implementation for authentication");
- if (conf->password_len < 65) {
- wpa_printf(MSG_DEBUG, "EAP-SIM: invalid GSM-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;
-
- for (i = 0; i < data->num_chal; i++) {
- if (gsm_milenage(opc, k, data->rand[i],
- data->sres[i], data->kc[i])) {
- wpa_printf(MSG_DEBUG, "EAP-SIM: "
- "GSM-Milenage authentication "
- "could not be completed");
- return -1;
- }
- wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
- data->rand[i], GSM_RAND_LEN);
- wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
- data->sres[i], EAP_SIM_SRES_LEN);
- wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
- data->kc[i], EAP_SIM_KC_LEN);
- }
- return 0;
- }
-#endif /* CONFIG_SIM_SIMULATOR */
-
-#ifdef CONFIG_SIM_HARDCODED
- /* These hardcoded Kc and SRES values are used for testing. RAND to
- * KC/SREC mapping is very bogus as far as real authentication is
- * concerned, but it is quite useful for cases where the AS is rotating
- * the order of pre-configured values. */
- {
- size_t i;
-
- wpa_printf(MSG_DEBUG, "EAP-SIM: Use hardcoded Kc and SRES "
- "values for testing");
-
- for (i = 0; i < data->num_chal; i++) {
- if (data->rand[i][0] == 0xaa) {
- os_memcpy(data->kc[i],
- "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
- EAP_SIM_KC_LEN);
- os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
- EAP_SIM_SRES_LEN);
- } else if (data->rand[i][0] == 0xbb) {
- os_memcpy(data->kc[i],
- "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
- EAP_SIM_KC_LEN);
- os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
- EAP_SIM_SRES_LEN);
- } else {
- os_memcpy(data->kc[i],
- "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
- EAP_SIM_KC_LEN);
- os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
- EAP_SIM_SRES_LEN);
- }
- }
- }
-
- return 0;
-
-#else /* CONFIG_SIM_HARDCODED */
-
- wpa_printf(MSG_DEBUG, "EAP-SIM: No GSM authentication algorithm "
- "enabled");
- return -1;
-
-#endif /* CONFIG_SIM_HARDCODED */
-}
-
-
-static int eap_sim_supported_ver(int version)
-{
- return version == EAP_SIM_VERSION;
-}
-
-
-#define CLEAR_PSEUDONYM 0x01
-#define CLEAR_REAUTH_ID 0x02
-#define CLEAR_EAP_ID 0x04
-
-static void eap_sim_clear_identities(struct eap_sim_data *data, int id)
-{
- wpa_printf(MSG_DEBUG, "EAP-SIM: 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_sim_learn_ids(struct eap_sim_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-SIM: (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-SIM: (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-SIM: (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-SIM: (encr) AT_NEXT_REAUTH_ID",
- data->reauth_id,
- data->reauth_id_len);
- }
-
- return 0;
-}
-
-
-static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id,
- int err)
-{
- struct eap_sim_msg *msg;
-
- eap_sim_state(data, FAILURE);
- data->num_id_req = 0;
- data->num_notification = 0;
-
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
- EAP_SIM_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_sim_response_start(struct eap_sm *sm,
- struct eap_sim_data *data, u8 id,
- enum eap_sim_id_req id_req)
-{
- const u8 *identity = NULL;
- size_t identity_len = 0;
- struct eap_sim_msg *msg;
-
- data->reauth = 0;
- if (id_req == ANY_ID && data->reauth_id) {
- identity = data->reauth_id;
- identity_len = data->reauth_id_len;
- data->reauth = 1;
- } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
- data->pseudonym) {
- identity = data->pseudonym;
- identity_len = data->pseudonym_len;
- eap_sim_clear_identities(data, CLEAR_REAUTH_ID);
- } else if (id_req != NO_ID_REQ) {
- identity = eap_get_config_identity(sm, &identity_len);
- if (identity) {
- eap_sim_clear_identities(data, CLEAR_PSEUDONYM |
- CLEAR_REAUTH_ID);
- }
- }
- if (id_req != NO_ID_REQ)
- eap_sim_clear_identities(data, CLEAR_EAP_ID);
-
- wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
- EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
- if (!data->reauth) {
- wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
- data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
- eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
- data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
- wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
- data->selected_version);
- eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
- data->selected_version, NULL, 0);
- }
-
- if (identity) {
- wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
- identity, identity_len);
- eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
- identity, identity_len);
- }
-
- return eap_sim_msg_finish(msg, NULL, NULL, 0);
-}
-
-
-static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data,
- u8 id)
-{
- struct eap_sim_msg *msg;
-
- wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
- EAP_SIM_SUBTYPE_CHALLENGE);
- if (data->use_result_ind) {
- wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
- eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
- }
- wpa_printf(MSG_DEBUG, " AT_MAC");
- eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
- return eap_sim_msg_finish(msg, data->k_aut, (u8 *) data->sres,
- data->num_chal * EAP_SIM_SRES_LEN);
-}
-
-
-static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data,
- u8 id, int counter_too_small)
-{
- struct eap_sim_msg *msg;
- unsigned int counter;
-
- wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
- id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
- EAP_SIM_SUBTYPE_REAUTHENTICATION);
- wpa_printf(MSG_DEBUG, " AT_IV");
- wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
- eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
-
- if (counter_too_small) {
- wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
- eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
- counter = data->counter_too_small;
- } else
- counter = data->counter;
-
- wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
- eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
-
- if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
- wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
- "AT_ENCR_DATA");
- eap_sim_msg_free(msg);
- return NULL;
- }
- if (data->use_result_ind) {
- wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
- eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
- }
- wpa_printf(MSG_DEBUG, " AT_MAC");
- eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
- return eap_sim_msg_finish(msg, data->k_aut, data->nonce_s,
- EAP_SIM_NONCE_S_LEN);
-}
-
-
-static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data,
- u8 id, u16 notification)
-{
- struct eap_sim_msg *msg;
- u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
-
- wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id);
- msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
- EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
- if (k_aut && data->reauth) {
- wpa_printf(MSG_DEBUG, " AT_IV");
- wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
- eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
- EAP_SIM_AT_ENCR_DATA);
- wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
- eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
- NULL, 0);
- if (eap_sim_msg_add_encr_end(msg, data->k_encr,
- EAP_SIM_AT_PADDING)) {
- wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
- "AT_ENCR_DATA");
- eap_sim_msg_free(msg);
- return NULL;
- }
- }
- if (k_aut) {
- wpa_printf(MSG_DEBUG, " AT_MAC");
- eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
- }
- return eap_sim_msg_finish(msg, k_aut, (u8 *) "", 0);
-}
-
-
-static struct wpabuf * eap_sim_process_start(struct eap_sm *sm,
- struct eap_sim_data *data, u8 id,
- struct eap_sim_attrs *attr)
-{
- int selected_version = -1, id_error;
- size_t i;
- 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(data, id,
- EAP_SIM_UNSUPPORTED_VERSION);
- }
-
- os_free(data->ver_list);
- data->ver_list = os_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(data, id,
- EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- }
- os_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(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(data, id,
- 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(data, id,
- EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- }
-
- return eap_sim_response_start(sm, data, id, attr->id_req);
-}
-
-
-static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
- struct eap_sim_data *data,
- u8 id,
- const struct wpabuf *reqData,
- struct eap_sim_attrs *attr)
-{
- const 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(data, id,
- 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(data, id,
- 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(data, id,
- EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- }
-
- /* Verify that RANDs are different */
- if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
- GSM_RAND_LEN) == 0 ||
- (attr->num_chal > 2 &&
- (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
- GSM_RAND_LEN) == 0 ||
- os_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(data, id,
- EAP_SIM_RAND_NOT_FRESH);
- }
-
- os_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(data, id,
- 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 = eap_get_config_identity(sm, &identity_len);
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
- "derivation", identity, identity_len);
- eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
- data->selected_version, data->ver_list,
- data->ver_list_len, data->num_chal,
- (const u8 *) data->kc, data->mk);
- eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
- data->emsk);
- if (eap_sim_verify_mac(data->k_aut, reqData, 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(data, id,
- 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(
- data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- }
- eap_sim_learn_ids(data, &eattr);
- os_free(decrypted);
- }
-
- if (data->result_ind && attr->result_ind)
- data->use_result_ind = 1;
-
- if (data->state != FAILURE && data->state != RESULT_FAILURE) {
- eap_sim_state(data, data->use_result_ind ?
- RESULT_SUCCESS : SUCCESS);
- }
-
- data->num_id_req = 0;
- data->num_notification = 0;
- /* RFC 4186 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(data, id);
-}
-
-
-static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
- 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 < 0 || (size_t) eattr.counter != data->counter) {
- wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
- "message does not match with counter in reauth "
- "message");
- os_free(decrypted);
- return -1;
- }
-
- os_free(decrypted);
- return 0;
-}
-
-
-static int eap_sim_process_notification_auth(struct eap_sim_data *data,
- const struct wpabuf *reqData,
- 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, reqData, 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, attr)) {
- wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
- "message after reauth");
- return -1;
- }
-
- return 0;
-}
-
-
-static struct wpabuf * eap_sim_process_notification(
- struct eap_sm *sm, struct eap_sim_data *data, u8 id,
- const struct wpabuf *reqData, 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(data, id,
- 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(data, id,
- EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- }
-
- if ((attr->notification & 0x4000) == 0 &&
- eap_sim_process_notification_auth(data, reqData, attr)) {
- return eap_sim_client_error(data, id,
- EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- }
-
- eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
- if (attr->notification >= 0 && attr->notification < 32768) {
- eap_sim_state(data, FAILURE);
- } else if (attr->notification == EAP_SIM_SUCCESS &&
- data->state == RESULT_SUCCESS)
- eap_sim_state(data, SUCCESS);
- return eap_sim_response_notification(data, id, attr->notification);
-}
-
-
-static struct wpabuf * eap_sim_process_reauthentication(
- struct eap_sm *sm, struct eap_sim_data *data, u8 id,
- const struct wpabuf *reqData, 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(data, id,
- EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- }
-
- data->reauth = 1;
- if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
- {
- wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
- "did not have valid AT_MAC");
- return eap_sim_client_error(data, id,
- 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(data, id,
- 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(data, id,
- 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" : "");
- os_free(decrypted);
- return eap_sim_client_error(data, id,
- EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- }
-
- if (eattr.counter < 0 || (size_t) 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. */
- os_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;
- os_free(decrypted);
- return eap_sim_response_reauth(data, id, 1);
- }
- data->counter = eattr.counter;
-
- os_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,
- data->emsk);
- eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
- eap_sim_learn_ids(data, &eattr);
-
- if (data->result_ind && attr->result_ind)
- data->use_result_ind = 1;
-
- if (data->state != FAILURE && data->state != RESULT_FAILURE) {
- eap_sim_state(data, data->use_result_ind ?
- RESULT_SUCCESS : 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);
- }
- os_free(decrypted);
- return eap_sim_response_reauth(data, id, 0);
-}
-
-
-static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv,
- struct eap_method_ret *ret,
- const struct wpabuf *reqData)
-{
- struct eap_sim_data *data = priv;
- const struct eap_hdr *req;
- u8 subtype, id;
- struct wpabuf *res;
- const u8 *pos;
- struct eap_sim_attrs attr;
- size_t len;
-
- wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData);
- if (eap_get_config_identity(sm, &len) == NULL) {
- wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
- eap_sm_request_identity(sm);
- ret->ignore = TRUE;
- return NULL;
- }
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len);
- if (pos == NULL || len < 1) {
- ret->ignore = TRUE;
- return NULL;
- }
- req = wpabuf_head(reqData);
- id = req->identifier;
- 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, wpabuf_head_u8(reqData) + len, &attr, 0,
- 0)) {
- res = eap_sim_client_error(data, id,
- EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- goto done;
- }
-
- switch (subtype) {
- case EAP_SIM_SUBTYPE_START:
- res = eap_sim_process_start(sm, data, id, &attr);
- break;
- case EAP_SIM_SUBTYPE_CHALLENGE:
- res = eap_sim_process_challenge(sm, data, id, reqData, &attr);
- break;
- case EAP_SIM_SUBTYPE_NOTIFICATION:
- res = eap_sim_process_notification(sm, data, id, reqData,
- &attr);
- break;
- case EAP_SIM_SUBTYPE_REAUTHENTICATION:
- res = eap_sim_process_reauthentication(sm, data, id, reqData,
- &attr);
- break;
- case EAP_SIM_SUBTYPE_CLIENT_ERROR:
- wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
- res = eap_sim_client_error(data, id,
- EAP_SIM_UNABLE_TO_PROCESS_PACKET);
- break;
- default:
- wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
- res = eap_sim_client_error(data, id,
- 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 = data->use_result_ind ?
- DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
- ret->methodState = data->use_result_ind ?
- METHOD_DONE : METHOD_MAY_CONT;
- } else if (data->state == RESULT_FAILURE)
- ret->methodState = METHOD_CONT;
- else if (data->state == RESULT_SUCCESS)
- ret->methodState = METHOD_CONT;
-
- 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);
- data->use_result_ind = 0;
-}
-
-
-static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
-{
- struct eap_sim_data *data = priv;
- if (os_get_random(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
- wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
- "for NONCE_MT");
- os_free(data);
- return NULL;
- }
- data->num_id_req = 0;
- data->num_notification = 0;
- eap_sim_state(data, 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 = os_malloc(EAP_SIM_KEYING_DATA_LEN);
- if (key == NULL)
- return NULL;
-
- *len = EAP_SIM_KEYING_DATA_LEN;
- os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
-
- return key;
-}
-
-
-static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
-{
- struct eap_sim_data *data = priv;
- u8 *key;
-
- if (data->state != SUCCESS)
- return NULL;
-
- key = os_malloc(EAP_EMSK_LEN);
- if (key == NULL)
- return NULL;
-
- *len = EAP_EMSK_LEN;
- os_memcpy(key, data->emsk, EAP_EMSK_LEN);
-
- return key;
-}
-
-
-int eap_peer_sim_register(void)
-{
- struct eap_method *eap;
- int ret;
-
- eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_sim_init;
- eap->deinit = eap_sim_deinit;
- eap->process = eap_sim_process;
- eap->isKeyAvailable = eap_sim_isKeyAvailable;
- eap->getKey = eap_sim_getKey;
- eap->has_reauth_data = eap_sim_has_reauth_data;
- eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
- eap->init_for_reauth = eap_sim_init_for_reauth;
- eap->get_identity = eap_sim_get_identity;
- eap->get_emsk = eap_sim_get_emsk;
-
- ret = eap_peer_method_register(eap);
- if (ret)
- eap_peer_method_free(eap);
- return ret;
-}
projects / mech_eap.git / blobdiff