+++ /dev/null
-/*
- * hostapd / EAP-GPSK (RFC 5433) server
- * Copyright (c) 2006-2007, 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_server/eap_i.h"
-#include "eap_common/eap_gpsk_common.h"
-
-
-struct eap_gpsk_data {
- enum { GPSK_1, GPSK_3, SUCCESS, FAILURE } state;
- u8 rand_server[EAP_GPSK_RAND_LEN];
- u8 rand_peer[EAP_GPSK_RAND_LEN];
- u8 msk[EAP_MSK_LEN];
- u8 emsk[EAP_EMSK_LEN];
- u8 sk[EAP_GPSK_MAX_SK_LEN];
- size_t sk_len;
- u8 pk[EAP_GPSK_MAX_PK_LEN];
- size_t pk_len;
- u8 *id_peer;
- size_t id_peer_len;
- u8 *id_server;
- size_t id_server_len;
-#define MAX_NUM_CSUITES 2
- struct eap_gpsk_csuite csuite_list[MAX_NUM_CSUITES];
- size_t csuite_count;
- int vendor; /* CSuite/Vendor */
- int specifier; /* CSuite/Specifier */
-};
-
-
-static const char * eap_gpsk_state_txt(int state)
-{
- switch (state) {
- case GPSK_1:
- return "GPSK-1";
- case GPSK_3:
- return "GPSK-3";
- case SUCCESS:
- return "SUCCESS";
- case FAILURE:
- return "FAILURE";
- default:
- return "?";
- }
-}
-
-
-static void eap_gpsk_state(struct eap_gpsk_data *data, int state)
-{
- wpa_printf(MSG_DEBUG, "EAP-GPSK: %s -> %s",
- eap_gpsk_state_txt(data->state),
- eap_gpsk_state_txt(state));
- data->state = state;
-}
-
-
-static void * eap_gpsk_init(struct eap_sm *sm)
-{
- struct eap_gpsk_data *data;
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
- data->state = GPSK_1;
-
- /* TODO: add support for configuring ID_Server */
- data->id_server = (u8 *) os_strdup("hostapd");
- if (data->id_server)
- data->id_server_len = os_strlen((char *) data->id_server);
-
- data->csuite_count = 0;
- if (eap_gpsk_supported_ciphersuite(EAP_GPSK_VENDOR_IETF,
- EAP_GPSK_CIPHER_AES)) {
- WPA_PUT_BE32(data->csuite_list[data->csuite_count].vendor,
- EAP_GPSK_VENDOR_IETF);
- WPA_PUT_BE16(data->csuite_list[data->csuite_count].specifier,
- EAP_GPSK_CIPHER_AES);
- data->csuite_count++;
- }
- if (eap_gpsk_supported_ciphersuite(EAP_GPSK_VENDOR_IETF,
- EAP_GPSK_CIPHER_SHA256)) {
- WPA_PUT_BE32(data->csuite_list[data->csuite_count].vendor,
- EAP_GPSK_VENDOR_IETF);
- WPA_PUT_BE16(data->csuite_list[data->csuite_count].specifier,
- EAP_GPSK_CIPHER_SHA256);
- data->csuite_count++;
- }
-
- return data;
-}
-
-
-static void eap_gpsk_reset(struct eap_sm *sm, void *priv)
-{
- struct eap_gpsk_data *data = priv;
- os_free(data->id_server);
- os_free(data->id_peer);
- os_free(data);
-}
-
-
-static struct wpabuf * eap_gpsk_build_gpsk_1(struct eap_sm *sm,
- struct eap_gpsk_data *data, u8 id)
-{
- size_t len;
- struct wpabuf *req;
-
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-1");
-
- if (os_get_random(data->rand_server, EAP_GPSK_RAND_LEN)) {
- wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to get random data");
- eap_gpsk_state(data, FAILURE);
- return NULL;
- }
- wpa_hexdump(MSG_MSGDUMP, "EAP-GPSK: RAND_Server",
- data->rand_server, EAP_GPSK_RAND_LEN);
-
- len = 1 + 2 + data->id_server_len + EAP_GPSK_RAND_LEN + 2 +
- data->csuite_count * sizeof(struct eap_gpsk_csuite);
- req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, len,
- EAP_CODE_REQUEST, id);
- if (req == NULL) {
- wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
- "for request/GPSK-1");
- eap_gpsk_state(data, FAILURE);
- return NULL;
- }
-
- wpabuf_put_u8(req, EAP_GPSK_OPCODE_GPSK_1);
- wpabuf_put_be16(req, data->id_server_len);
- wpabuf_put_data(req, data->id_server, data->id_server_len);
- wpabuf_put_data(req, data->rand_server, EAP_GPSK_RAND_LEN);
- wpabuf_put_be16(req,
- data->csuite_count * sizeof(struct eap_gpsk_csuite));
- wpabuf_put_data(req, data->csuite_list,
- data->csuite_count * sizeof(struct eap_gpsk_csuite));
-
- return req;
-}
-
-
-static struct wpabuf * eap_gpsk_build_gpsk_3(struct eap_sm *sm,
- struct eap_gpsk_data *data, u8 id)
-{
- u8 *pos, *start;
- size_t len, miclen;
- struct eap_gpsk_csuite *csuite;
- struct wpabuf *req;
-
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Request/GPSK-3");
-
- miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
- len = 1 + 2 * EAP_GPSK_RAND_LEN + 2 + data->id_server_len +
- sizeof(struct eap_gpsk_csuite) + 2 + miclen;
- req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_GPSK, len,
- EAP_CODE_REQUEST, id);
- if (req == NULL) {
- wpa_printf(MSG_ERROR, "EAP-GPSK: Failed to allocate memory "
- "for request/GPSK-3");
- eap_gpsk_state(data, FAILURE);
- return NULL;
- }
-
- wpabuf_put_u8(req, EAP_GPSK_OPCODE_GPSK_3);
- start = wpabuf_put(req, 0);
-
- wpabuf_put_data(req, data->rand_peer, EAP_GPSK_RAND_LEN);
- wpabuf_put_data(req, data->rand_server, EAP_GPSK_RAND_LEN);
- wpabuf_put_be16(req, data->id_server_len);
- wpabuf_put_data(req, data->id_server, data->id_server_len);
- csuite = wpabuf_put(req, sizeof(*csuite));
- WPA_PUT_BE32(csuite->vendor, data->vendor);
- WPA_PUT_BE16(csuite->specifier, data->specifier);
-
- /* no PD_Payload_2 */
- wpabuf_put_be16(req, 0);
-
- pos = wpabuf_put(req, miclen);
- if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
- data->specifier, start, pos - start, pos) < 0)
- {
- os_free(req);
- eap_gpsk_state(data, FAILURE);
- return NULL;
- }
-
- return req;
-}
-
-
-static struct wpabuf * eap_gpsk_buildReq(struct eap_sm *sm, void *priv, u8 id)
-{
- struct eap_gpsk_data *data = priv;
-
- switch (data->state) {
- case GPSK_1:
- return eap_gpsk_build_gpsk_1(sm, data, id);
- case GPSK_3:
- return eap_gpsk_build_gpsk_3(sm, data, id);
- default:
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Unknown state %d in buildReq",
- data->state);
- break;
- }
- return NULL;
-}
-
-
-static Boolean eap_gpsk_check(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- struct eap_gpsk_data *data = priv;
- const u8 *pos;
- size_t len;
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respData, &len);
- if (pos == NULL || len < 1) {
- wpa_printf(MSG_INFO, "EAP-GPSK: Invalid frame");
- return TRUE;
- }
-
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Received frame: opcode=%d", *pos);
-
- if (data->state == GPSK_1 && *pos == EAP_GPSK_OPCODE_GPSK_2)
- return FALSE;
-
- if (data->state == GPSK_3 && *pos == EAP_GPSK_OPCODE_GPSK_4)
- return FALSE;
-
- wpa_printf(MSG_INFO, "EAP-GPSK: Unexpected opcode=%d in state=%d",
- *pos, data->state);
-
- return TRUE;
-}
-
-
-static void eap_gpsk_process_gpsk_2(struct eap_sm *sm,
- struct eap_gpsk_data *data,
- const u8 *payload, size_t payloadlen)
-{
- const u8 *pos, *end;
- u16 alen;
- const struct eap_gpsk_csuite *csuite;
- size_t i, miclen;
- u8 mic[EAP_GPSK_MAX_MIC_LEN];
-
- if (data->state != GPSK_1)
- return;
-
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-2");
-
- pos = payload;
- end = payload + payloadlen;
-
- if (end - pos < 2) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "ID_Peer length");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- alen = WPA_GET_BE16(pos);
- pos += 2;
- if (end - pos < alen) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "ID_Peer");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- os_free(data->id_peer);
- data->id_peer = os_malloc(alen);
- if (data->id_peer == NULL) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Not enough memory to store "
- "%d-octet ID_Peer", alen);
- return;
- }
- os_memcpy(data->id_peer, pos, alen);
- data->id_peer_len = alen;
- wpa_hexdump_ascii(MSG_DEBUG, "EAP-GPSK: ID_Peer",
- data->id_peer, data->id_peer_len);
- pos += alen;
-
- if (end - pos < 2) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "ID_Server length");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- alen = WPA_GET_BE16(pos);
- pos += 2;
- if (end - pos < alen) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "ID_Server");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- if (alen != data->id_server_len ||
- os_memcmp(pos, data->id_server, alen) != 0) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: ID_Server in GPSK-1 and "
- "GPSK-2 did not match");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- pos += alen;
-
- if (end - pos < EAP_GPSK_RAND_LEN) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "RAND_Peer");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- os_memcpy(data->rand_peer, pos, EAP_GPSK_RAND_LEN);
- wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Peer",
- data->rand_peer, EAP_GPSK_RAND_LEN);
- pos += EAP_GPSK_RAND_LEN;
-
- if (end - pos < EAP_GPSK_RAND_LEN) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "RAND_Server");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- if (os_memcmp(data->rand_server, pos, EAP_GPSK_RAND_LEN) != 0) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1 and "
- "GPSK-2 did not match");
- wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-1",
- data->rand_server, EAP_GPSK_RAND_LEN);
- wpa_hexdump(MSG_DEBUG, "EAP-GPSK: RAND_Server in GPSK-2",
- pos, EAP_GPSK_RAND_LEN);
- eap_gpsk_state(data, FAILURE);
- return;
- }
- pos += EAP_GPSK_RAND_LEN;
-
- if (end - pos < 2) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "CSuite_List length");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- alen = WPA_GET_BE16(pos);
- pos += 2;
- if (end - pos < alen) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "CSuite_List");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- if (alen != data->csuite_count * sizeof(struct eap_gpsk_csuite) ||
- os_memcmp(pos, data->csuite_list, alen) != 0) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_List in GPSK-1 and "
- "GPSK-2 did not match");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- pos += alen;
-
- if (end - pos < (int) sizeof(*csuite)) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "CSuite_Sel");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- csuite = (const struct eap_gpsk_csuite *) pos;
- for (i = 0; i < data->csuite_count; i++) {
- if (os_memcmp(csuite, &data->csuite_list[i], sizeof(*csuite))
- == 0)
- break;
- }
- if (i == data->csuite_count) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Peer selected unsupported "
- "ciphersuite %d:%d",
- WPA_GET_BE32(csuite->vendor),
- WPA_GET_BE16(csuite->specifier));
- eap_gpsk_state(data, FAILURE);
- return;
- }
- data->vendor = WPA_GET_BE32(csuite->vendor);
- data->specifier = WPA_GET_BE16(csuite->specifier);
- wpa_printf(MSG_DEBUG, "EAP-GPSK: CSuite_Sel %d:%d",
- data->vendor, data->specifier);
- pos += sizeof(*csuite);
-
- if (end - pos < 2) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "PD_Payload_1 length");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- alen = WPA_GET_BE16(pos);
- pos += 2;
- if (end - pos < alen) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "PD_Payload_1");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
- pos += alen;
-
- if (sm->user == NULL || sm->user->password == NULL) {
- wpa_printf(MSG_INFO, "EAP-GPSK: No PSK/password configured "
- "for the user");
- eap_gpsk_state(data, FAILURE);
- return;
- }
-
- if (eap_gpsk_derive_keys(sm->user->password, sm->user->password_len,
- data->vendor, data->specifier,
- data->rand_peer, data->rand_server,
- data->id_peer, data->id_peer_len,
- data->id_server, data->id_server_len,
- data->msk, data->emsk,
- data->sk, &data->sk_len,
- data->pk, &data->pk_len) < 0) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to derive keys");
- eap_gpsk_state(data, FAILURE);
- return;
- }
-
- miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
- if (end - pos < (int) miclen) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
- "(left=%lu miclen=%lu)",
- (unsigned long) (end - pos),
- (unsigned long) miclen);
- eap_gpsk_state(data, FAILURE);
- return;
- }
- if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
- data->specifier, payload, pos - payload, mic)
- < 0) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- if (os_memcmp(mic, pos, miclen) != 0) {
- wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-2");
- wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
- wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
- eap_gpsk_state(data, FAILURE);
- return;
- }
- pos += miclen;
-
- if (pos != end) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
- "data in the end of GPSK-2",
- (unsigned long) (end - pos));
- }
-
- eap_gpsk_state(data, GPSK_3);
-}
-
-
-static void eap_gpsk_process_gpsk_4(struct eap_sm *sm,
- struct eap_gpsk_data *data,
- const u8 *payload, size_t payloadlen)
-{
- const u8 *pos, *end;
- u16 alen;
- size_t miclen;
- u8 mic[EAP_GPSK_MAX_MIC_LEN];
-
- if (data->state != GPSK_3)
- return;
-
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Received Response/GPSK-4");
-
- pos = payload;
- end = payload + payloadlen;
-
- if (end - pos < 2) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "PD_Payload_1 length");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- alen = WPA_GET_BE16(pos);
- pos += 2;
- if (end - pos < alen) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Too short message for "
- "PD_Payload_1");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- wpa_hexdump(MSG_DEBUG, "EAP-GPSK: PD_Payload_1", pos, alen);
- pos += alen;
-
- miclen = eap_gpsk_mic_len(data->vendor, data->specifier);
- if (end - pos < (int) miclen) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Message too short for MIC "
- "(left=%lu miclen=%lu)",
- (unsigned long) (end - pos),
- (unsigned long) miclen);
- eap_gpsk_state(data, FAILURE);
- return;
- }
- if (eap_gpsk_compute_mic(data->sk, data->sk_len, data->vendor,
- data->specifier, payload, pos - payload, mic)
- < 0) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Failed to compute MIC");
- eap_gpsk_state(data, FAILURE);
- return;
- }
- if (os_memcmp(mic, pos, miclen) != 0) {
- wpa_printf(MSG_INFO, "EAP-GPSK: Incorrect MIC in GPSK-4");
- wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Received MIC", pos, miclen);
- wpa_hexdump(MSG_DEBUG, "EAP-GPSK: Computed MIC", mic, miclen);
- eap_gpsk_state(data, FAILURE);
- return;
- }
- pos += miclen;
-
- if (pos != end) {
- wpa_printf(MSG_DEBUG, "EAP-GPSK: Ignored %lu bytes of extra "
- "data in the end of GPSK-4",
- (unsigned long) (end - pos));
- }
-
- eap_gpsk_state(data, SUCCESS);
-}
-
-
-static void eap_gpsk_process(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- struct eap_gpsk_data *data = priv;
- const u8 *pos;
- size_t len;
-
- pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_GPSK, respData, &len);
- if (pos == NULL || len < 1)
- return;
-
- switch (*pos) {
- case EAP_GPSK_OPCODE_GPSK_2:
- eap_gpsk_process_gpsk_2(sm, data, pos + 1, len - 1);
- break;
- case EAP_GPSK_OPCODE_GPSK_4:
- eap_gpsk_process_gpsk_4(sm, data, pos + 1, len - 1);
- break;
- }
-}
-
-
-static Boolean eap_gpsk_isDone(struct eap_sm *sm, void *priv)
-{
- struct eap_gpsk_data *data = priv;
- return data->state == SUCCESS || data->state == FAILURE;
-}
-
-
-static u8 * eap_gpsk_getKey(struct eap_sm *sm, void *priv, size_t *len)
-{
- struct eap_gpsk_data *data = priv;
- u8 *key;
-
- if (data->state != SUCCESS)
- return NULL;
-
- key = os_malloc(EAP_MSK_LEN);
- if (key == NULL)
- return NULL;
- os_memcpy(key, data->msk, EAP_MSK_LEN);
- *len = EAP_MSK_LEN;
-
- return key;
-}
-
-
-static u8 * eap_gpsk_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
-{
- struct eap_gpsk_data *data = priv;
- u8 *key;
-
- if (data->state != SUCCESS)
- return NULL;
-
- key = os_malloc(EAP_EMSK_LEN);
- if (key == NULL)
- return NULL;
- os_memcpy(key, data->emsk, EAP_EMSK_LEN);
- *len = EAP_EMSK_LEN;
-
- return key;
-}
-
-
-static Boolean eap_gpsk_isSuccess(struct eap_sm *sm, void *priv)
-{
- struct eap_gpsk_data *data = priv;
- return data->state == SUCCESS;
-}
-
-
-int eap_server_gpsk_register(void)
-{
- struct eap_method *eap;
- int ret;
-
- eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_IETF, EAP_TYPE_GPSK, "GPSK");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_gpsk_init;
- eap->reset = eap_gpsk_reset;
- eap->buildReq = eap_gpsk_buildReq;
- eap->check = eap_gpsk_check;
- eap->process = eap_gpsk_process;
- eap->isDone = eap_gpsk_isDone;
- eap->getKey = eap_gpsk_getKey;
- eap->isSuccess = eap_gpsk_isSuccess;
- eap->get_emsk = eap_gpsk_get_emsk;
-
- ret = eap_server_method_register(eap);
- if (ret)
- eap_server_method_free(eap);
- return ret;
-}
projects / mech_eap.git / blobdiff