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authorJouni Malinen <j@w1.fi>2008-02-28 01:34:43 (GMT)
committerJouni Malinen <jm@jm.kir.nu>2008-02-28 01:34:43 (GMT)
commit6fc6879bd55a394f807cbbe927df736c190cb8ab (patch)
treecdf50da0c58f21510a808d53502a060d911ff243 /src/eap_peer/eap_sim.c
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Re-initialize hostapd/wpa_supplicant git repository based on 0.6.3 release
Diffstat (limited to 'src/eap_peer/eap_sim.c')
-rw-r--r--src/eap_peer/eap_sim.c1038
1 files changed, 1038 insertions, 0 deletions
diff --git a/src/eap_peer/eap_sim.c b/src/eap_peer/eap_sim.c
new file mode 100644
index 0000000..c89eddd
--- /dev/null
+++ b/src/eap_peer/eap_sim.c
@@ -0,0 +1,1038 @@
+/*
+ * 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 "eap_peer/eap_i.h"
+#include "eap_config.h"
+#include "pcsc_funcs.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)
+{
+ wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
+#ifdef PCSC_FUNCS
+ 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;
+ }
+#else /* PCSC_FUNCS */
+ /* 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;
+ 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);
+ }
+ }
+ }
+#endif /* PCSC_FUNCS */
+ return 0;
+}
+
+
+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);
+ wpa_printf(MSG_DEBUG, " AT_NOTIFICATION");
+ eap_sim_msg_add(msg, EAP_SIM_AT_NOTIFICATION, notification, NULL, 0);
+ 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;
+}