1393 lines
38 KiB
C
1393 lines
38 KiB
C
/*
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* WPA Supplicant / EAP-TTLS (draft-ietf-pppext-eap-ttls-03.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 "eap_tls_common.h"
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#include "wpa_supplicant.h"
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#include "config_ssid.h"
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#include "ms_funcs.h"
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#include "md5.h"
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#include "tls.h"
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#include "eap_ttls.h"
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static void eap_ttls_deinit(struct eap_sm *sm, void *priv);
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struct eap_ttls_data {
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struct eap_ssl_data ssl;
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const struct eap_method *phase2_method;
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void *phase2_priv;
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int phase2_success;
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int phase2_start;
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enum {
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EAP_TTLS_PHASE2_EAP,
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EAP_TTLS_PHASE2_MSCHAPV2,
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EAP_TTLS_PHASE2_MSCHAP,
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EAP_TTLS_PHASE2_PAP,
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EAP_TTLS_PHASE2_CHAP
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} phase2_type;
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u8 phase2_eap_type;
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u8 *phase2_eap_types;
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size_t num_phase2_eap_types;
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u8 auth_response[20];
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int auth_response_valid;
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u8 ident;
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int resuming; /* starting a resumed session */
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int reauth; /* reauthentication */
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u8 *key_data;
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u8 *pending_phase2_req;
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size_t pending_phase2_req_len;
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};
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static void * eap_ttls_init(struct eap_sm *sm)
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{
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struct eap_ttls_data *data;
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struct wpa_ssid *config = eap_get_config(sm);
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char *selected;
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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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selected = "EAP";
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data->phase2_type = EAP_TTLS_PHASE2_EAP;
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if (config && config->phase2) {
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if (strstr(config->phase2, "autheap=")) {
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selected = "EAP";
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data->phase2_type = EAP_TTLS_PHASE2_EAP;
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} else if (strstr(config->phase2, "auth=MSCHAPV2")) {
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selected = "MSCHAPV2";
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data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2;
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} else if (strstr(config->phase2, "auth=MSCHAP")) {
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selected = "MSCHAP";
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data->phase2_type = EAP_TTLS_PHASE2_MSCHAP;
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} else if (strstr(config->phase2, "auth=PAP")) {
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selected = "PAP";
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data->phase2_type = EAP_TTLS_PHASE2_PAP;
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} else if (strstr(config->phase2, "auth=CHAP")) {
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selected = "CHAP";
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data->phase2_type = EAP_TTLS_PHASE2_CHAP;
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}
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}
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wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected);
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if (data->phase2_type == EAP_TTLS_PHASE2_EAP) {
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if (config && config->phase2) {
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char *start, *pos, *buf;
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u8 method, *methods = NULL, *_methods;
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size_t num_methods = 0;
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start = buf = strdup(config->phase2);
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if (buf == NULL) {
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eap_ttls_deinit(sm, data);
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return NULL;
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}
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while (start && *start != '\0') {
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pos = strstr(start, "autheap=");
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if (pos == NULL)
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break;
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if (start != pos && *(pos - 1) != ' ') {
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start = pos + 8;
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continue;
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}
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start = pos + 8;
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pos = strchr(start, ' ');
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if (pos)
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*pos++ = '\0';
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method = eap_get_phase2_type(start);
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if (method == EAP_TYPE_NONE) {
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wpa_printf(MSG_ERROR, "EAP-TTLS: "
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"Unsupported Phase2 EAP "
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"method '%s'", start);
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} else {
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num_methods++;
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_methods = realloc(methods,
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num_methods);
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if (_methods == NULL) {
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free(methods);
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eap_ttls_deinit(sm, data);
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return NULL;
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}
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methods = _methods;
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methods[num_methods - 1] = method;
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}
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start = pos;
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}
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free(buf);
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data->phase2_eap_types = methods;
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data->num_phase2_eap_types = num_methods;
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}
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if (data->phase2_eap_types == NULL) {
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data->phase2_eap_types = eap_get_phase2_types(
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config, &data->num_phase2_eap_types);
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}
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if (data->phase2_eap_types == NULL) {
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wpa_printf(MSG_ERROR, "EAP-TTLS: No Phase2 EAP method "
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"available");
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eap_ttls_deinit(sm, data);
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return NULL;
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}
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wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase2 EAP types",
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data->phase2_eap_types,
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data->num_phase2_eap_types);
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data->phase2_eap_type = EAP_TYPE_NONE;
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}
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if (eap_tls_ssl_init(sm, &data->ssl, config)) {
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wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
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eap_ttls_deinit(sm, data);
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return NULL;
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}
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return data;
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}
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static void eap_ttls_deinit(struct eap_sm *sm, void *priv)
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{
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struct eap_ttls_data *data = priv;
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if (data == NULL)
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return;
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if (data->phase2_priv && data->phase2_method)
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data->phase2_method->deinit(sm, data->phase2_priv);
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free(data->phase2_eap_types);
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eap_tls_ssl_deinit(sm, &data->ssl);
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free(data->key_data);
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free(data->pending_phase2_req);
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free(data);
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}
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static int eap_ttls_encrypt(struct eap_sm *sm, struct eap_ttls_data *data,
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int id, u8 *plain, size_t plain_len,
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u8 **out_data, size_t *out_len)
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{
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int res;
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u8 *pos;
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struct eap_hdr *resp;
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/* TODO: add support for fragmentation, if needed. This will need to
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* add TLS Message Length field, if the frame is fragmented. */
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resp = malloc(sizeof(struct eap_hdr) + 2 + data->ssl.tls_out_limit);
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if (resp == NULL)
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return -1;
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resp->code = EAP_CODE_RESPONSE;
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resp->identifier = id;
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pos = (u8 *) (resp + 1);
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*pos++ = EAP_TYPE_TTLS;
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*pos++ = 0;
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res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
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plain, plain_len,
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pos, data->ssl.tls_out_limit);
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if (res < 0) {
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wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt Phase 2 "
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"data");
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free(resp);
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return -1;
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}
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*out_len = sizeof(struct eap_hdr) + 2 + res;
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resp->length = host_to_be16(*out_len);
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*out_data = (u8 *) resp;
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return 0;
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}
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static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id,
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int mandatory, size_t len)
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{
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struct ttls_avp_vendor *avp;
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u8 flags;
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size_t hdrlen;
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avp = (struct ttls_avp_vendor *) avphdr;
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flags = mandatory ? AVP_FLAGS_MANDATORY : 0;
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if (vendor_id) {
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flags |= AVP_FLAGS_VENDOR;
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hdrlen = sizeof(*avp);
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avp->vendor_id = host_to_be32(vendor_id);
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} else {
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hdrlen = sizeof(struct ttls_avp);
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}
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avp->avp_code = host_to_be32(avp_code);
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avp->avp_length = host_to_be32((flags << 24) | (hdrlen + len));
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return avphdr + hdrlen;
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}
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static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code,
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u32 vendor_id, int mandatory,
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u8 *data, size_t len)
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{
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u8 *pos;
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pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len);
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memcpy(pos, data, len);
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pos += len;
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AVP_PAD(start, pos);
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return pos;
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}
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static int eap_ttls_avp_encapsulate(u8 **resp, size_t *resp_len, u32 avp_code,
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int mandatory)
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{
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u8 *avp, *pos;
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avp = malloc(sizeof(struct ttls_avp) + *resp_len + 4);
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if (avp == NULL) {
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free(*resp);
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*resp = NULL;
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*resp_len = 0;
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return -1;
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}
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pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, *resp_len);
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memcpy(pos, *resp, *resp_len);
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pos += *resp_len;
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AVP_PAD(avp, pos);
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free(*resp);
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*resp = avp;
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*resp_len = pos - avp;
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return 0;
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}
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static int eap_ttls_phase2_nak(struct eap_sm *sm,
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struct eap_ttls_data *data,
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struct eap_hdr *hdr,
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u8 **resp, size_t *resp_len)
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{
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struct eap_hdr *resp_hdr;
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u8 *pos = (u8 *) (hdr + 1);
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wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 Request: Nak type=%d", *pos);
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wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Allowed Phase2 EAP types",
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data->phase2_eap_types, data->num_phase2_eap_types);
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*resp_len = sizeof(struct eap_hdr) + 1 + data->num_phase2_eap_types;
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*resp = malloc(*resp_len);
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if (*resp == NULL)
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return -1;
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resp_hdr = (struct eap_hdr *) (*resp);
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resp_hdr->code = EAP_CODE_RESPONSE;
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resp_hdr->identifier = hdr->identifier;
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resp_hdr->length = host_to_be16(*resp_len);
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pos = (u8 *) (resp_hdr + 1);
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*pos++ = EAP_TYPE_NAK;
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memcpy(pos, data->phase2_eap_types, data->num_phase2_eap_types);
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return 0;
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}
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static int eap_ttls_phase2_request_eap(struct eap_sm *sm,
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struct eap_ttls_data *data,
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struct eap_method_ret *ret,
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struct eap_hdr *req,
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struct eap_hdr *hdr,
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u8 **resp, size_t *resp_len)
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{
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size_t len = be_to_host16(hdr->length);
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u8 *pos;
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struct eap_method_ret iret;
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struct wpa_ssid *config = eap_get_config(sm);
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if (len <= sizeof(struct eap_hdr)) {
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wpa_printf(MSG_INFO, "EAP-TTLS: too short "
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"Phase 2 request (len=%lu)", (unsigned long) len);
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return -1;
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}
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pos = (u8 *) (hdr + 1);
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wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos);
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switch (*pos) {
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case EAP_TYPE_IDENTITY:
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*resp = eap_sm_buildIdentity(sm, req->identifier, resp_len, 1);
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break;
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default:
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if (data->phase2_eap_type == EAP_TYPE_NONE) {
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int i;
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for (i = 0; i < data->num_phase2_eap_types; i++) {
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if (data->phase2_eap_types[i] != *pos)
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continue;
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data->phase2_eap_type = *pos;
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wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
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"Phase 2 EAP method %d",
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data->phase2_eap_type);
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break;
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}
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}
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if (*pos != data->phase2_eap_type || *pos == EAP_TYPE_NONE) {
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if (eap_ttls_phase2_nak(sm, data, hdr, resp, resp_len))
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return -1;
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break;
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}
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if (data->phase2_priv == NULL) {
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data->phase2_method = eap_sm_get_eap_methods(*pos);
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if (data->phase2_method) {
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sm->init_phase2 = 1;
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data->phase2_priv =
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data->phase2_method->init(sm);
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sm->init_phase2 = 0;
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}
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}
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if (data->phase2_priv == NULL || data->phase2_method == NULL) {
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wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize "
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"Phase 2 EAP method %d", *pos);
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return -1;
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}
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memset(&iret, 0, sizeof(iret));
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*resp = data->phase2_method->process(sm, data->phase2_priv,
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&iret, (u8 *) hdr, len,
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resp_len);
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if ((iret.methodState == METHOD_DONE ||
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iret.methodState == METHOD_MAY_CONT) &&
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(iret.decision == DECISION_UNCOND_SUCC ||
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iret.decision == DECISION_COND_SUCC ||
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iret.decision == DECISION_FAIL)) {
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ret->methodState = iret.methodState;
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ret->decision = iret.decision;
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}
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break;
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}
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if (*resp == NULL &&
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(config->pending_req_identity || config->pending_req_password ||
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config->pending_req_otp)) {
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return 0;
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}
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if (*resp == NULL)
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return -1;
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wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response",
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*resp, *resp_len);
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return eap_ttls_avp_encapsulate(resp, resp_len,
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RADIUS_ATTR_EAP_MESSAGE, 1);
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}
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static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm,
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struct eap_ttls_data *data,
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struct eap_method_ret *ret,
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struct eap_hdr *req,
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struct eap_hdr *hdr,
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u8 **resp, size_t *resp_len)
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{
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struct wpa_ssid *config = eap_get_config(sm);
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u8 *buf, *pos, *challenge, *username, *peer_challenge;
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size_t username_len;
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int i;
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wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request");
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/* MSCHAPv2 does not include optional domain name in the
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* challenge-response calculation, so remove domain prefix
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* (if present). */
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username = config->identity;
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username_len = config->identity_len;
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pos = username;
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for (i = 0; i < username_len; i++) {
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if (username[i] == '\\') {
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username_len -= i + 1;
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username += i + 1;
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break;
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}
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}
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pos = buf = malloc(config->identity_len + 1000);
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if (buf == NULL) {
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wpa_printf(MSG_ERROR,
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"EAP-TTLS/MSCHAPV2: Failed to allocate memory");
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return -1;
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}
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/* User-Name */
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pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
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config->identity, config->identity_len);
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/* MS-CHAP-Challenge */
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challenge = eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
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EAP_TTLS_MSCHAPV2_CHALLENGE_LEN * 2 +
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1);
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if (challenge == NULL) {
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free(buf);
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wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
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"implicit challenge");
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return -1;
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}
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peer_challenge = challenge + 1 + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
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pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
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RADIUS_VENDOR_ID_MICROSOFT, 1,
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challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
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/* MS-CHAP2-Response */
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pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE,
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RADIUS_VENDOR_ID_MICROSOFT, 1,
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EAP_TTLS_MSCHAPV2_RESPONSE_LEN);
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data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN];
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*pos++ = data->ident;
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*pos++ = 0; /* Flags */
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memcpy(pos, peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
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pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
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memset(pos, 0, 8); /* Reserved, must be zero */
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pos += 8;
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wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: implicit auth_challenge",
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challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
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wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: peer_challenge",
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peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 username",
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username, username_len);
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wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 password",
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config->password, config->password_len);
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generate_nt_response(challenge, peer_challenge,
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username, username_len,
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config->password, config->password_len,
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|
pos);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 response", pos, 24);
|
|
generate_authenticator_response(config->password, config->password_len,
|
|
peer_challenge, challenge,
|
|
username, username_len,
|
|
pos, data->auth_response);
|
|
data->auth_response_valid = 1;
|
|
|
|
pos += 24;
|
|
free(challenge);
|
|
AVP_PAD(buf, pos);
|
|
|
|
*resp = buf;
|
|
*resp_len = pos - buf;
|
|
|
|
if (sm->workaround) {
|
|
/* At least FreeRADIUS seems to be terminating
|
|
* EAP-TTLS/MSHCAPV2 without the expected MS-CHAP-v2 Success
|
|
* packet. */
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: EAP workaround - "
|
|
"allow success without tunneled response");
|
|
ret->methodState = METHOD_MAY_CONT;
|
|
ret->decision = DECISION_COND_SUCC;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
struct eap_method_ret *ret,
|
|
struct eap_hdr *req,
|
|
struct eap_hdr *hdr,
|
|
u8 **resp, size_t *resp_len)
|
|
{
|
|
struct wpa_ssid *config = eap_get_config(sm);
|
|
u8 *buf, *pos, *challenge;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request");
|
|
|
|
pos = buf = malloc(config->identity_len + 1000);
|
|
if (buf == NULL) {
|
|
wpa_printf(MSG_ERROR,
|
|
"EAP-TTLS/MSCHAP: Failed to allocate memory");
|
|
return -1;
|
|
}
|
|
|
|
/* User-Name */
|
|
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
|
|
config->identity, config->identity_len);
|
|
|
|
/* MS-CHAP-Challenge */
|
|
challenge = eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
|
|
EAP_TLS_KEY_LEN);
|
|
if (challenge == NULL) {
|
|
free(buf);
|
|
wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive "
|
|
"implicit challenge");
|
|
return -1;
|
|
}
|
|
|
|
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
|
|
RADIUS_VENDOR_ID_MICROSOFT, 1,
|
|
challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
|
|
|
|
/* MS-CHAP-Response */
|
|
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE,
|
|
RADIUS_VENDOR_ID_MICROSOFT, 1,
|
|
EAP_TTLS_MSCHAP_RESPONSE_LEN);
|
|
data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN];
|
|
*pos++ = data->ident;
|
|
*pos++ = 1; /* Flags: Use NT style passwords */
|
|
memset(pos, 0, 24); /* LM-Response */
|
|
pos += 24;
|
|
nt_challenge_response(challenge,
|
|
config->password, config->password_len,
|
|
pos); /* NT-Response */
|
|
wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
|
|
config->password, config->password_len);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge",
|
|
challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24);
|
|
pos += 24;
|
|
free(challenge);
|
|
AVP_PAD(buf, pos);
|
|
|
|
*resp = buf;
|
|
*resp_len = pos - buf;
|
|
|
|
/* EAP-TTLS/MSCHAP does not provide tunneled success notification, so
|
|
* assume that Phase2 succeeds. */
|
|
ret->methodState = METHOD_DONE;
|
|
ret->decision = DECISION_COND_SUCC;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int eap_ttls_phase2_request_pap(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
struct eap_method_ret *ret,
|
|
struct eap_hdr *req,
|
|
struct eap_hdr *hdr,
|
|
u8 **resp, size_t *resp_len)
|
|
{
|
|
struct wpa_ssid *config = eap_get_config(sm);
|
|
u8 *buf, *pos;
|
|
size_t pad;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request");
|
|
|
|
pos = buf = malloc(config->identity_len + config->password_len + 100);
|
|
if (buf == NULL) {
|
|
wpa_printf(MSG_ERROR,
|
|
"EAP-TTLS/PAP: Failed to allocate memory");
|
|
return -1;
|
|
}
|
|
|
|
/* User-Name */
|
|
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
|
|
config->identity, config->identity_len);
|
|
|
|
/* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts
|
|
* the data, so no separate encryption is used in the AVP itself.
|
|
* However, the password is padded to obfuscate its length. */
|
|
pad = (16 - (config->password_len & 15)) & 15;
|
|
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1,
|
|
config->password_len + pad);
|
|
memcpy(pos, config->password, config->password_len);
|
|
pos += config->password_len;
|
|
memset(pos, 0, pad);
|
|
pos += pad;
|
|
AVP_PAD(buf, pos);
|
|
|
|
*resp = buf;
|
|
*resp_len = pos - buf;
|
|
|
|
/* EAP-TTLS/PAP does not provide tunneled success notification, so
|
|
* assume that Phase2 succeeds. */
|
|
ret->methodState = METHOD_DONE;
|
|
ret->decision = DECISION_COND_SUCC;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int eap_ttls_phase2_request_chap(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
struct eap_method_ret *ret,
|
|
struct eap_hdr *req,
|
|
struct eap_hdr *hdr,
|
|
u8 **resp, size_t *resp_len)
|
|
{
|
|
struct wpa_ssid *config = eap_get_config(sm);
|
|
u8 *buf, *pos, *challenge;
|
|
MD5_CTX context;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");
|
|
|
|
pos = buf = malloc(config->identity_len + 1000);
|
|
if (buf == NULL) {
|
|
wpa_printf(MSG_ERROR,
|
|
"EAP-TTLS/CHAP: Failed to allocate memory");
|
|
return -1;
|
|
}
|
|
|
|
/* User-Name */
|
|
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
|
|
config->identity, config->identity_len);
|
|
|
|
/* CHAP-Challenge */
|
|
challenge = eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
|
|
EAP_TLS_KEY_LEN);
|
|
if (challenge == NULL) {
|
|
free(buf);
|
|
wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
|
|
"implicit challenge");
|
|
return -1;
|
|
}
|
|
|
|
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
|
|
challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
|
|
|
|
/* CHAP-Password */
|
|
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
|
|
1 + EAP_TTLS_CHAP_PASSWORD_LEN);
|
|
data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
|
|
*pos++ = data->ident;
|
|
|
|
/* MD5(Ident + Password + Challenge) */
|
|
MD5Init(&context);
|
|
MD5Update(&context, &data->ident, 1);
|
|
MD5Update(&context, config->password, config->password_len);
|
|
MD5Update(&context, challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
|
|
MD5Final(pos, &context);
|
|
|
|
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
|
|
config->identity, config->identity_len);
|
|
wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
|
|
config->password, config->password_len);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
|
|
challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
|
|
pos, EAP_TTLS_CHAP_PASSWORD_LEN);
|
|
pos += EAP_TTLS_CHAP_PASSWORD_LEN;
|
|
free(challenge);
|
|
AVP_PAD(buf, pos);
|
|
|
|
*resp = buf;
|
|
*resp_len = pos - buf;
|
|
|
|
/* EAP-TTLS/CHAP does not provide tunneled success notification, so
|
|
* assume that Phase2 succeeds. */
|
|
ret->methodState = METHOD_DONE;
|
|
ret->decision = DECISION_COND_SUCC;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int eap_ttls_phase2_request(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
struct eap_method_ret *ret,
|
|
struct eap_hdr *req,
|
|
struct eap_hdr *hdr,
|
|
u8 **resp, size_t *resp_len)
|
|
{
|
|
struct wpa_ssid *config = eap_get_config(sm);
|
|
int res = 0;
|
|
|
|
if (data->phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
|
|
data->phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
|
|
data->phase2_type == EAP_TTLS_PHASE2_PAP ||
|
|
data->phase2_type == EAP_TTLS_PHASE2_CHAP) {
|
|
if (config == NULL || config->identity == NULL) {
|
|
wpa_printf(MSG_INFO,
|
|
"EAP-TTLS: Identity not configured");
|
|
eap_sm_request_identity(sm, config);
|
|
if (config->password == NULL)
|
|
eap_sm_request_password(sm, config);
|
|
return 0;
|
|
}
|
|
|
|
if (config->password == NULL) {
|
|
wpa_printf(MSG_INFO,
|
|
"EAP-TTLS: Password not configured");
|
|
eap_sm_request_password(sm, config);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
switch (data->phase2_type) {
|
|
case EAP_TTLS_PHASE2_EAP:
|
|
res = eap_ttls_phase2_request_eap(sm, data, ret, req, hdr,
|
|
resp, resp_len);
|
|
break;
|
|
case EAP_TTLS_PHASE2_MSCHAPV2:
|
|
res = eap_ttls_phase2_request_mschapv2(sm, data, ret, req, hdr,
|
|
resp, resp_len);
|
|
break;
|
|
case EAP_TTLS_PHASE2_MSCHAP:
|
|
res = eap_ttls_phase2_request_mschap(sm, data, ret, req, hdr,
|
|
resp, resp_len);
|
|
break;
|
|
case EAP_TTLS_PHASE2_PAP:
|
|
res = eap_ttls_phase2_request_pap(sm, data, ret, req, hdr,
|
|
resp, resp_len);
|
|
break;
|
|
case EAP_TTLS_PHASE2_CHAP:
|
|
res = eap_ttls_phase2_request_chap(sm, data, ret, req, hdr,
|
|
resp, resp_len);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown");
|
|
res = -1;
|
|
break;
|
|
}
|
|
|
|
if (res < 0) {
|
|
ret->methodState = METHOD_DONE;
|
|
ret->decision = DECISION_FAIL;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
|
|
struct eap_method_ret *ret, struct eap_hdr *req,
|
|
u8 *in_data, size_t in_len,
|
|
u8 **out_data, size_t *out_len)
|
|
{
|
|
u8 *in_decrypted = NULL, *pos;
|
|
int buf_len, len_decrypted = 0, len, left, retval = 0, res;
|
|
struct eap_hdr *hdr = NULL;
|
|
u8 *resp = NULL, *mschapv2 = NULL, *eapdata = NULL;
|
|
size_t resp_len, eap_len = 0;
|
|
struct ttls_avp *avp;
|
|
u8 recv_response[20];
|
|
int mschapv2_error = 0;
|
|
struct wpa_ssid *config = eap_get_config(sm);
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
|
|
" Phase 2", (unsigned long) in_len);
|
|
|
|
if (data->pending_phase2_req) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
|
|
"skip decryption and use old data");
|
|
/* Clear TLS reassembly state. */
|
|
free(data->ssl.tls_in);
|
|
data->ssl.tls_in = NULL;
|
|
data->ssl.tls_in_len = 0;
|
|
data->ssl.tls_in_left = 0;
|
|
data->ssl.tls_in_total = 0;
|
|
|
|
in_decrypted = data->pending_phase2_req;
|
|
data->pending_phase2_req = NULL;
|
|
len_decrypted = data->pending_phase2_req_len;
|
|
if (data->pending_phase2_req_len == 0) {
|
|
free(in_decrypted);
|
|
in_decrypted = NULL;
|
|
goto fake_req_identity;
|
|
}
|
|
goto continue_req;
|
|
}
|
|
|
|
if (in_len == 0 && data->phase2_start) {
|
|
data->phase2_start = 0;
|
|
/* EAP-TTLS does not use Phase2 on fast re-auth; this must be
|
|
* done only if TLS part was indeed resuming a previous
|
|
* session. Most Authentication Servers terminate EAP-TTLS
|
|
* before reaching this point, but some do not. Make
|
|
* wpa_supplicant stop phase 2 here, if needed. */
|
|
if (data->reauth &&
|
|
tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
|
|
"skip phase 2");
|
|
*out_data = eap_tls_build_ack(&data->ssl, out_len,
|
|
req->identifier,
|
|
EAP_TYPE_TTLS, 0);
|
|
ret->methodState = METHOD_DONE;
|
|
ret->decision = DECISION_UNCOND_SUCC;
|
|
data->phase2_success = 1;
|
|
return 0;
|
|
}
|
|
fake_req_identity:
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of "
|
|
"Phase 2 - use fake EAP-Request Identity");
|
|
buf_len = sizeof(*hdr) + 1;
|
|
in_decrypted = malloc(buf_len);
|
|
if (in_decrypted == NULL) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate "
|
|
"memory for fake EAP-Identity Request");
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
hdr = (struct eap_hdr *) in_decrypted;
|
|
hdr->code = EAP_CODE_REQUEST;
|
|
hdr->identifier = 0;
|
|
hdr->length = host_to_be16(sizeof(*hdr) + 1);
|
|
in_decrypted[sizeof(*hdr)] = EAP_TYPE_IDENTITY;
|
|
goto process_eap;
|
|
}
|
|
|
|
res = eap_tls_data_reassemble(sm, &data->ssl, &in_data, &in_len);
|
|
if (res < 0 || res == 1) {
|
|
retval = res;
|
|
goto done;
|
|
}
|
|
|
|
buf_len = in_len;
|
|
if (data->ssl.tls_in_total > buf_len)
|
|
buf_len = data->ssl.tls_in_total;
|
|
in_decrypted = malloc(buf_len);
|
|
if (in_decrypted == NULL) {
|
|
free(data->ssl.tls_in);
|
|
data->ssl.tls_in = NULL;
|
|
data->ssl.tls_in_len = 0;
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate memory "
|
|
"for decryption");
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
|
|
len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
|
|
in_data, in_len,
|
|
in_decrypted, buf_len);
|
|
free(data->ssl.tls_in);
|
|
data->ssl.tls_in = NULL;
|
|
data->ssl.tls_in_len = 0;
|
|
if (len_decrypted < 0) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to decrypt Phase 2 "
|
|
"data");
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
|
|
continue_req:
|
|
data->phase2_start = 0;
|
|
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs",
|
|
in_decrypted, len_decrypted);
|
|
if (len_decrypted < sizeof(struct ttls_avp)) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame"
|
|
" len=%d expected %lu or more - dropped",
|
|
len_decrypted,
|
|
(unsigned long) sizeof(struct ttls_avp));
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
|
|
/* Parse AVPs */
|
|
pos = in_decrypted;
|
|
left = len_decrypted;
|
|
mschapv2 = NULL;
|
|
|
|
while (left > 0) {
|
|
u32 avp_code, avp_length, vendor_id = 0;
|
|
u8 avp_flags, *dpos;
|
|
size_t pad, dlen;
|
|
avp = (struct ttls_avp *) pos;
|
|
avp_code = be_to_host32(avp->avp_code);
|
|
avp_length = be_to_host32(avp->avp_length);
|
|
avp_flags = (avp_length >> 24) & 0xff;
|
|
avp_length &= 0xffffff;
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
|
|
"length=%d", (int) avp_code, avp_flags,
|
|
(int) avp_length);
|
|
if (avp_length > left) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
|
|
"(len=%d, left=%d) - dropped",
|
|
(int) avp_length, left);
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
dpos = (u8 *) (avp + 1);
|
|
dlen = avp_length - sizeof(*avp);
|
|
if (avp_flags & AVP_FLAGS_VENDOR) {
|
|
if (dlen < 4) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: vendor AVP "
|
|
"underflow");
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
vendor_id = be_to_host32(* (u32 *) dpos);
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
|
|
(int) vendor_id);
|
|
dpos += 4;
|
|
dlen -= 4;
|
|
}
|
|
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
|
|
|
|
if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
|
|
if (eapdata == NULL) {
|
|
eapdata = malloc(dlen);
|
|
if (eapdata == NULL) {
|
|
retval = -1;
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: "
|
|
"failed to allocate memory "
|
|
"for Phase 2 EAP data");
|
|
goto done;
|
|
}
|
|
memcpy(eapdata, dpos, dlen);
|
|
eap_len = dlen;
|
|
} else {
|
|
u8 *neweap = realloc(eapdata, eap_len + dlen);
|
|
if (neweap == NULL) {
|
|
retval = -1;
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: "
|
|
"failed to allocate memory "
|
|
"for Phase 2 EAP data");
|
|
goto done;
|
|
}
|
|
memcpy(neweap + eap_len, dpos, dlen);
|
|
eapdata = neweap;
|
|
eap_len += dlen;
|
|
}
|
|
} else if (vendor_id == 0 &&
|
|
avp_code == RADIUS_ATTR_REPLY_MESSAGE) {
|
|
/* This is an optional message that can be displayed to
|
|
* the user. */
|
|
wpa_hexdump_ascii(MSG_DEBUG,
|
|
"EAP-TTLS: AVP - Reply-Message",
|
|
dpos, dlen);
|
|
} else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
|
|
avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) {
|
|
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: "
|
|
"MS-CHAP2-Success", dpos, dlen);
|
|
if (dlen != 43) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected "
|
|
"MS-CHAP2-Success length "
|
|
"(len=%lu, expected 43)",
|
|
(unsigned long) dlen);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
mschapv2 = dpos;
|
|
} else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
|
|
avp_code == RADIUS_ATTR_MS_CHAP_ERROR) {
|
|
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: "
|
|
"MS-CHAP-Error", dpos, dlen);
|
|
mschapv2_error = 1;
|
|
} else if (avp_flags & AVP_FLAGS_MANDATORY) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported "
|
|
"mandatory AVP code %d vendor_id %d - "
|
|
"dropped", (int) avp_code, (int) vendor_id);
|
|
retval = -1;
|
|
goto done;
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported "
|
|
"AVP code %d vendor_id %d",
|
|
(int) avp_code, (int) vendor_id);
|
|
}
|
|
|
|
pad = (4 - (avp_length & 3)) & 3;
|
|
pos += avp_length + pad;
|
|
left -= avp_length + pad;
|
|
}
|
|
|
|
switch (data->phase2_type) {
|
|
case EAP_TTLS_PHASE2_EAP:
|
|
if (eapdata == NULL) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in "
|
|
"the packet - dropped");
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP",
|
|
eapdata, eap_len);
|
|
hdr = (struct eap_hdr *) eapdata;
|
|
|
|
if (eap_len < sizeof(*hdr)) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 "
|
|
"EAP frame (len=%lu, expected %lu or more) "
|
|
"- dropped", (unsigned long) eap_len,
|
|
(unsigned long) sizeof(*hdr));
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
len = be_to_host16(hdr->length);
|
|
if (len > eap_len) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in "
|
|
"Phase 2 EAP frame (EAP hdr len=%d, EAP "
|
|
"data len in AVP=%lu)", len,
|
|
(unsigned long) eap_len);
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d "
|
|
"identifier=%d length=%d",
|
|
hdr->code, hdr->identifier, len);
|
|
process_eap:
|
|
switch (hdr->code) {
|
|
case EAP_CODE_REQUEST:
|
|
if (eap_ttls_phase2_request(sm, data, ret, req, hdr,
|
|
&resp, &resp_len)) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 "
|
|
"Request processing failed");
|
|
retval = -1;
|
|
goto done;
|
|
}
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in "
|
|
"Phase 2 EAP header", hdr->code);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
break;
|
|
case EAP_TTLS_PHASE2_MSCHAPV2:
|
|
if (mschapv2_error) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received "
|
|
"MS-CHAP-Error - failed");
|
|
ret->methodState = METHOD_DONE;
|
|
ret->decision = DECISION_FAIL;
|
|
*out_data = eap_tls_build_ack(&data->ssl, out_len,
|
|
req->identifier,
|
|
EAP_TYPE_TTLS, 0);
|
|
break;
|
|
}
|
|
|
|
if (mschapv2 == NULL) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success"
|
|
" AVP received for Phase2 MSCHAPV2");
|
|
retval = -1;
|
|
break;
|
|
}
|
|
if (mschapv2[0] != data->ident) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch "
|
|
"for Phase 2 MSCHAPV2 (received Ident "
|
|
"0x%02x, expected 0x%02x)",
|
|
mschapv2[0], data->ident);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
if (!data->auth_response_valid ||
|
|
mschapv2[1] != 'S' || mschapv2[2] != '=' ||
|
|
hexstr2bin((char *) (mschapv2 + 3), recv_response, 20) ||
|
|
memcmp(data->auth_response, recv_response, 20) != 0) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid "
|
|
"authenticator response in Phase 2 "
|
|
"MSCHAPV2 success request");
|
|
retval = -1;
|
|
break;
|
|
}
|
|
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 "
|
|
"authentication succeeded");
|
|
ret->methodState = METHOD_DONE;
|
|
ret->decision = DECISION_UNCOND_SUCC;
|
|
data->phase2_success = 1;
|
|
|
|
/* Reply with empty data; authentication server will reply
|
|
* with EAP-Success after this. */
|
|
retval = 1;
|
|
goto done;
|
|
case EAP_TTLS_PHASE2_MSCHAP:
|
|
case EAP_TTLS_PHASE2_PAP:
|
|
case EAP_TTLS_PHASE2_CHAP:
|
|
/* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled
|
|
* requests to the supplicant */
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected "
|
|
"tunneled data");
|
|
retval = -1;
|
|
break;
|
|
}
|
|
|
|
if (resp) {
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data",
|
|
resp, resp_len);
|
|
|
|
if (eap_ttls_encrypt(sm, data, req->identifier,
|
|
resp, resp_len, out_data, out_len)) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt "
|
|
"a Phase 2 frame");
|
|
}
|
|
free(resp);
|
|
} else if (config->pending_req_identity ||
|
|
config->pending_req_password ||
|
|
config->pending_req_otp) {
|
|
free(data->pending_phase2_req);
|
|
data->pending_phase2_req = malloc(len_decrypted);
|
|
if (data->pending_phase2_req) {
|
|
memcpy(data->pending_phase2_req, in_decrypted,
|
|
len_decrypted);
|
|
data->pending_phase2_req_len = len_decrypted;
|
|
}
|
|
}
|
|
|
|
done:
|
|
free(in_decrypted);
|
|
free(eapdata);
|
|
|
|
if (retval < 0) {
|
|
ret->methodState = METHOD_DONE;
|
|
ret->decision = DECISION_FAIL;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
static u8 * eap_ttls_process(struct eap_sm *sm, void *priv,
|
|
struct eap_method_ret *ret,
|
|
u8 *reqData, size_t reqDataLen,
|
|
size_t *respDataLen)
|
|
{
|
|
struct eap_hdr *req;
|
|
int left, res;
|
|
unsigned int tls_msg_len;
|
|
u8 flags, *pos, *resp, id;
|
|
struct eap_ttls_data *data = priv;
|
|
|
|
if (tls_get_errors(sm->ssl_ctx)) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: TLS errors detected");
|
|
ret->ignore = TRUE;
|
|
return NULL;
|
|
}
|
|
|
|
req = (struct eap_hdr *) reqData;
|
|
pos = (u8 *) (req + 1);
|
|
if (reqDataLen < sizeof(*req) + 2 || *pos != EAP_TYPE_TTLS ||
|
|
(left = be_to_host16(req->length)) > reqDataLen) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Invalid frame");
|
|
ret->ignore = TRUE;
|
|
return NULL;
|
|
}
|
|
left -= sizeof(struct eap_hdr);
|
|
id = req->identifier;
|
|
pos++;
|
|
flags = *pos++;
|
|
left -= 2;
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Received packet(len=%lu) - "
|
|
"Flags 0x%02x", (unsigned long) reqDataLen, flags);
|
|
if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
|
|
if (left < 4) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Short frame with TLS "
|
|
"length");
|
|
ret->ignore = TRUE;
|
|
return NULL;
|
|
}
|
|
tls_msg_len = (pos[0] << 24) | (pos[1] << 16) | (pos[2] << 8) |
|
|
pos[3];
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS Message Length: %d",
|
|
tls_msg_len);
|
|
if (data->ssl.tls_in_left == 0) {
|
|
data->ssl.tls_in_total = tls_msg_len;
|
|
data->ssl.tls_in_left = tls_msg_len;
|
|
free(data->ssl.tls_in);
|
|
data->ssl.tls_in = NULL;
|
|
data->ssl.tls_in_len = 0;
|
|
}
|
|
pos += 4;
|
|
left -= 4;
|
|
}
|
|
|
|
ret->ignore = FALSE;
|
|
ret->methodState = METHOD_CONT;
|
|
ret->decision = DECISION_FAIL;
|
|
ret->allowNotifications = TRUE;
|
|
|
|
if (flags & EAP_TLS_FLAGS_START) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Start");
|
|
/* draft-ietf-pppext-eap-ttls-03.txt, Ch. 8.1:
|
|
* EAP-TTLS Start packet may, in a future specification, be
|
|
* allowed to contain data. Client based on this draft version
|
|
* must ignore such data but must not reject the Start packet.
|
|
*/
|
|
left = 0;
|
|
}
|
|
|
|
resp = NULL;
|
|
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
|
|
!data->resuming) {
|
|
res = eap_ttls_decrypt(sm, data, ret, req, pos, left,
|
|
&resp, respDataLen);
|
|
} else {
|
|
res = eap_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS, 0,
|
|
id, pos, left,
|
|
&resp, respDataLen);
|
|
|
|
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
|
|
wpa_printf(MSG_DEBUG,
|
|
"EAP-TTLS: TLS done, proceed to Phase 2");
|
|
if (data->resuming) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth -"
|
|
" may skip Phase 2");
|
|
ret->decision = DECISION_COND_SUCC;
|
|
ret->methodState = METHOD_MAY_CONT;
|
|
}
|
|
data->phase2_start = 1;
|
|
free(data->key_data);
|
|
data->key_data =
|
|
eap_tls_derive_key(sm, &data->ssl,
|
|
"ttls keying material",
|
|
EAP_TLS_KEY_LEN);
|
|
if (data->key_data) {
|
|
wpa_hexdump_key(MSG_DEBUG,
|
|
"EAP-TTLS: Derived key",
|
|
data->key_data,
|
|
EAP_TLS_KEY_LEN);
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to "
|
|
"derive key");
|
|
}
|
|
|
|
if (*respDataLen == 0) {
|
|
if (eap_ttls_decrypt(sm, data, ret, req, NULL,
|
|
0, &resp, respDataLen)) {
|
|
wpa_printf(MSG_WARNING, "EAP-TTLS: "
|
|
"failed to process early "
|
|
"start for Phase 2");
|
|
}
|
|
res = 0;
|
|
}
|
|
data->resuming = 0;
|
|
}
|
|
}
|
|
|
|
if (ret->methodState == METHOD_DONE) {
|
|
ret->allowNotifications = FALSE;
|
|
if (ret->decision == DECISION_UNCOND_SUCC ||
|
|
ret->decision == DECISION_COND_SUCC) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
|
|
"completed successfully");
|
|
data->phase2_success = 1;
|
|
}
|
|
} else if (sm->workaround && ret->methodState == METHOD_MAY_CONT &&
|
|
(ret->decision == DECISION_UNCOND_SUCC ||
|
|
ret->decision == DECISION_COND_SUCC)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
|
|
"completed successfully (EAP workaround)");
|
|
data->phase2_success = 1;
|
|
}
|
|
|
|
if (res == 1) {
|
|
return eap_tls_build_ack(&data->ssl, respDataLen, id,
|
|
EAP_TYPE_TTLS, 0);
|
|
}
|
|
return resp;
|
|
}
|
|
|
|
|
|
static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
|
|
data->phase2_success;
|
|
}
|
|
|
|
|
|
static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
free(data->pending_phase2_req);
|
|
data->pending_phase2_req = NULL;
|
|
}
|
|
|
|
|
|
static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
free(data->key_data);
|
|
data->key_data = NULL;
|
|
if (eap_tls_reauth_init(sm, &data->ssl)) {
|
|
free(data);
|
|
return NULL;
|
|
}
|
|
data->phase2_start = 0;
|
|
data->phase2_success = 0;
|
|
data->resuming = 1;
|
|
data->reauth = 1;
|
|
return priv;
|
|
}
|
|
|
|
|
|
static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf,
|
|
size_t buflen, int verbose)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
int len;
|
|
|
|
len = eap_tls_status(sm, &data->ssl, buf, buflen, verbose);
|
|
switch (data->phase2_type) {
|
|
case EAP_TTLS_PHASE2_EAP:
|
|
len += snprintf(buf + len, buflen - len,
|
|
"EAP-TTLS Phase2 method=EAP-%s\n",
|
|
data->phase2_method ? data->phase2_method->name
|
|
: "?");
|
|
break;
|
|
case EAP_TTLS_PHASE2_MSCHAPV2:
|
|
len += snprintf(buf + len, buflen - len,
|
|
"EAP-TTLS Phase2 method=MSCHAPV2\n");
|
|
break;
|
|
case EAP_TTLS_PHASE2_MSCHAP:
|
|
len += snprintf(buf + len, buflen - len,
|
|
"EAP-TTLS Phase2 method=MSCHAP\n");
|
|
break;
|
|
case EAP_TTLS_PHASE2_PAP:
|
|
len += snprintf(buf + len, buflen - len,
|
|
"EAP-TTLS Phase2 method=PAP\n");
|
|
break;
|
|
case EAP_TTLS_PHASE2_CHAP:
|
|
len += snprintf(buf + len, buflen - len,
|
|
"EAP-TTLS Phase2 method=CHAP\n");
|
|
break;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
|
|
static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
return data->key_data != NULL && data->phase2_success;
|
|
}
|
|
|
|
|
|
static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
u8 *key;
|
|
|
|
if (data->key_data == NULL || !data->phase2_success)
|
|
return NULL;
|
|
|
|
key = malloc(EAP_TLS_KEY_LEN);
|
|
if (key == NULL)
|
|
return NULL;
|
|
|
|
*len = EAP_TLS_KEY_LEN;
|
|
memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
|
|
|
|
return key;
|
|
}
|
|
|
|
|
|
const struct eap_method eap_method_ttls =
|
|
{
|
|
.method = EAP_TYPE_TTLS,
|
|
.name = "TTLS",
|
|
.init = eap_ttls_init,
|
|
.deinit = eap_ttls_deinit,
|
|
.process = eap_ttls_process,
|
|
.isKeyAvailable = eap_ttls_isKeyAvailable,
|
|
.getKey = eap_ttls_getKey,
|
|
.get_status = eap_ttls_get_status,
|
|
.has_reauth_data = eap_ttls_has_reauth_data,
|
|
.deinit_for_reauth = eap_ttls_deinit_for_reauth,
|
|
.init_for_reauth = eap_ttls_init_for_reauth,
|
|
};
|