1194 lines
31 KiB
C
1194 lines
31 KiB
C
/*
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* hostapd / EAP-TTLS (draft-ietf-pppext-eap-ttls-05.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 <netinet/in.h>
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#include "hostapd.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 "ms_funcs.h"
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#include "md5.h"
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#include "crypto.h"
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#include "tls.h"
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#include "eap_ttls.h"
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#define EAP_TTLS_VERSION 0
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static void eap_ttls_reset(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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enum {
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START, PHASE1, PHASE2_START, PHASE2_METHOD,
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PHASE2_MSCHAPV2_RESP, SUCCESS, FAILURE
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} state;
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int ttls_version;
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const struct eap_method *phase2_method;
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void *phase2_priv;
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int mschapv2_resp_ok;
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u8 mschapv2_auth_response[20];
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u8 mschapv2_ident;
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};
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static const char * eap_ttls_state_txt(int state)
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{
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switch (state) {
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case START:
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return "START";
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case PHASE1:
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return "PHASE1";
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case PHASE2_START:
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return "PHASE2_START";
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case PHASE2_METHOD:
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return "PHASE2_METHOD";
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case PHASE2_MSCHAPV2_RESP:
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return "PHASE2_MSCHAPV2_RESP";
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case SUCCESS:
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return "SUCCESS";
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case FAILURE:
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return "FAILURE";
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default:
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return "Unknown?!";
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}
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}
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static void eap_ttls_state(struct eap_ttls_data *data, int state)
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{
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wpa_printf(MSG_DEBUG, "EAP-TTLS: %s -> %s",
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eap_ttls_state_txt(data->state),
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eap_ttls_state_txt(state));
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data->state = state;
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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 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_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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struct eap_ttls_avp {
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/* Note: eap is allocated memory; caller is responsible for freeing
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* it. All the other pointers are pointing to the packet data, i.e.,
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* they must not be freed separately. */
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u8 *eap;
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size_t eap_len;
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u8 *user_name;
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size_t user_name_len;
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u8 *user_password;
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size_t user_password_len;
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u8 *chap_challenge;
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size_t chap_challenge_len;
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u8 *chap_password;
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size_t chap_password_len;
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u8 *mschap_challenge;
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size_t mschap_challenge_len;
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u8 *mschap_response;
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size_t mschap_response_len;
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u8 *mschap2_response;
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size_t mschap2_response_len;
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};
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static int eap_ttls_avp_parse(u8 *buf, size_t len, struct eap_ttls_avp *parse)
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{
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struct ttls_avp *avp;
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u8 *pos;
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int left;
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pos = buf;
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left = len;
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memset(parse, 0, sizeof(*parse));
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while (left > 0) {
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u32 avp_code, avp_length, vendor_id = 0;
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u8 avp_flags, *dpos;
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size_t pad, dlen;
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avp = (struct ttls_avp *) pos;
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avp_code = be_to_host32(avp->avp_code);
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avp_length = be_to_host32(avp->avp_length);
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avp_flags = (avp_length >> 24) & 0xff;
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avp_length &= 0xffffff;
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wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
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"length=%d", (int) avp_code, avp_flags,
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(int) avp_length);
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if (avp_length > left) {
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wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
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"(len=%d, left=%d) - dropped",
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(int) avp_length, left);
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return -1;
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}
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dpos = (u8 *) (avp + 1);
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dlen = avp_length - sizeof(*avp);
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if (avp_flags & AVP_FLAGS_VENDOR) {
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if (dlen < 4) {
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wpa_printf(MSG_WARNING, "EAP-TTLS: vendor AVP "
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"underflow");
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return -1;
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}
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vendor_id = be_to_host32(* (u32 *) dpos);
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wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
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(int) vendor_id);
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dpos += 4;
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dlen -= 4;
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}
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wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
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if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
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wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
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if (parse->eap == NULL) {
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parse->eap = malloc(dlen);
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if (parse->eap == NULL) {
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wpa_printf(MSG_WARNING, "EAP-TTLS: "
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"failed to allocate memory "
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"for Phase 2 EAP data");
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return -1;
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}
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memcpy(parse->eap, dpos, dlen);
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parse->eap_len = dlen;
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} else {
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u8 *neweap = realloc(parse->eap,
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parse->eap_len + dlen);
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if (neweap == NULL) {
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wpa_printf(MSG_WARNING, "EAP-TTLS: "
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"failed to allocate memory "
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"for Phase 2 EAP data");
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free(parse->eap);
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parse->eap = NULL;
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return -1;
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}
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memcpy(neweap + parse->eap_len, dpos, dlen);
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parse->eap = neweap;
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parse->eap_len += dlen;
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}
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} else if (vendor_id == 0 &&
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avp_code == RADIUS_ATTR_USER_NAME) {
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wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: User-Name",
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dpos, dlen);
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parse->user_name = dpos;
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parse->user_name_len = dlen;
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} else if (vendor_id == 0 &&
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avp_code == RADIUS_ATTR_USER_PASSWORD) {
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u8 *password = dpos;
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size_t password_len = dlen;
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while (password_len > 0 &&
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password[password_len - 1] == '\0') {
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password_len--;
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}
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wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: "
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"User-Password (PAP)",
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password, password_len);
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parse->user_password = password;
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parse->user_password_len = password_len;
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} else if (vendor_id == 0 &&
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avp_code == RADIUS_ATTR_CHAP_CHALLENGE) {
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wpa_hexdump(MSG_DEBUG,
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"EAP-TTLS: CHAP-Challenge (CHAP)",
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dpos, dlen);
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parse->chap_challenge = dpos;
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parse->chap_challenge_len = dlen;
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} else if (vendor_id == 0 &&
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avp_code == RADIUS_ATTR_CHAP_PASSWORD) {
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wpa_hexdump(MSG_DEBUG,
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"EAP-TTLS: CHAP-Password (CHAP)",
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dpos, dlen);
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parse->chap_password = dpos;
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parse->chap_password_len = dlen;
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} else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
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avp_code == RADIUS_ATTR_MS_CHAP_CHALLENGE) {
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wpa_hexdump(MSG_DEBUG,
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"EAP-TTLS: MS-CHAP-Challenge",
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dpos, dlen);
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parse->mschap_challenge = dpos;
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parse->mschap_challenge_len = dlen;
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} else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
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avp_code == RADIUS_ATTR_MS_CHAP_RESPONSE) {
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wpa_hexdump(MSG_DEBUG,
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"EAP-TTLS: MS-CHAP-Response (MSCHAP)",
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dpos, dlen);
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parse->mschap_response = dpos;
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parse->mschap_response_len = dlen;
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} else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
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avp_code == RADIUS_ATTR_MS_CHAP2_RESPONSE) {
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wpa_hexdump(MSG_DEBUG,
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"EAP-TTLS: MS-CHAP2-Response (MSCHAPV2)",
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dpos, dlen);
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parse->mschap2_response = dpos;
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parse->mschap2_response_len = dlen;
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} else if (avp_flags & AVP_FLAGS_MANDATORY) {
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wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported "
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"mandatory AVP code %d vendor_id %d - "
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"dropped", (int) avp_code, (int) vendor_id);
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return -1;
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} else {
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wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported "
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"AVP code %d vendor_id %d",
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(int) avp_code, (int) vendor_id);
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}
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pad = (4 - (avp_length & 3)) & 3;
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pos += avp_length + pad;
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left -= avp_length + pad;
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}
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return 0;
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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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data = malloc(sizeof(*data));
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if (data == NULL)
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return data;
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memset(data, 0, sizeof(*data));
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data->ttls_version = EAP_TTLS_VERSION;
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data->state = START;
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if (eap_tls_ssl_init(sm, &data->ssl, 0)) {
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wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
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eap_ttls_reset(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_reset(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->reset(sm, data->phase2_priv);
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eap_tls_ssl_deinit(sm, &data->ssl);
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free(data);
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}
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static u8 * eap_ttls_build_start(struct eap_sm *sm, struct eap_ttls_data *data,
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int id, size_t *reqDataLen)
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{
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struct eap_hdr *req;
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u8 *pos;
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*reqDataLen = sizeof(*req) + 2;
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req = malloc(*reqDataLen);
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if (req == NULL) {
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wpa_printf(MSG_ERROR, "EAP-TTLS: Failed to allocate memory for"
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" request");
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eap_ttls_state(data, FAILURE);
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return NULL;
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}
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req->code = EAP_CODE_REQUEST;
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req->identifier = id;
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req->length = htons(*reqDataLen);
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pos = (u8 *) (req + 1);
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*pos++ = EAP_TYPE_TTLS;
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*pos = EAP_TLS_FLAGS_START | data->ttls_version;
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eap_ttls_state(data, PHASE1);
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return (u8 *) req;
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}
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static u8 * eap_ttls_build_req(struct eap_sm *sm, struct eap_ttls_data *data,
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int id, size_t *reqDataLen)
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{
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int res;
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u8 *req;
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res = eap_tls_buildReq_helper(sm, &data->ssl, EAP_TYPE_TTLS,
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data->ttls_version, id, &req,
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reqDataLen);
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if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
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wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase1 done, starting "
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"Phase2");
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eap_ttls_state(data, PHASE2_START);
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}
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if (res == 1)
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return eap_tls_build_ack(reqDataLen, id, EAP_TYPE_TTLS,
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data->ttls_version);
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return req;
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}
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static u8 * 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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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 *req;
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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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req = malloc(sizeof(struct eap_hdr) + 2 + data->ssl.tls_out_limit);
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if (req == NULL)
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return NULL;
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req->code = EAP_CODE_REQUEST;
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req->identifier = id;
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pos = (u8 *) (req + 1);
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*pos++ = EAP_TYPE_TTLS;
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*pos++ = data->ttls_version;
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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(req);
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return NULL;
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}
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*out_len = sizeof(struct eap_hdr) + 2 + res;
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req->length = host_to_be16(*out_len);
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return (u8 *) req;
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}
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static u8 * eap_ttls_build_phase2_eap_req(struct eap_sm *sm,
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struct eap_ttls_data *data,
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int id, size_t *reqDataLen)
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{
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u8 *req, *encr_req;
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size_t req_len;
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req = data->phase2_method->buildReq(sm, data->phase2_priv, id,
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&req_len);
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if (req == NULL)
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return NULL;
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wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS/EAP: Encapsulate Phase 2 data",
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req, req_len);
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if (eap_ttls_avp_encapsulate(&req, &req_len, RADIUS_ATTR_EAP_MESSAGE,
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1) < 0) {
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wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: Failed to encapsulate "
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"packet");
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return NULL;
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}
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wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS/EAP: Encrypt encapsulated Phase "
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"2 data", req, req_len);
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encr_req = eap_ttls_encrypt(sm, data, id, req, req_len, reqDataLen);
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free(req);
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return encr_req;
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}
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static u8 * eap_ttls_build_phase2_mschapv2(struct eap_sm *sm,
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struct eap_ttls_data *data,
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int id, size_t *reqDataLen)
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{
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u8 *req, *encr_req, *pos, *end;
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size_t req_len;
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int i;
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pos = req = malloc(100);
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if (req == NULL)
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return NULL;
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end = req + 200;
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if (data->mschapv2_resp_ok) {
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pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_SUCCESS,
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RADIUS_VENDOR_ID_MICROSOFT, 1, 43);
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*pos++ = data->mschapv2_ident;
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pos += snprintf((char *) pos, end - pos, "S=");
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for (i = 0; i < sizeof(data->mschapv2_auth_response); i++) {
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pos += snprintf((char *) pos, end - pos, "%02X",
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data->mschapv2_auth_response[i]);
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}
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} else {
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pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_ERROR,
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RADIUS_VENDOR_ID_MICROSOFT, 1, 6);
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memcpy(pos, "Failed", 6);
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pos += 6;
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AVP_PAD(req, pos);
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}
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req_len = pos - req;
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wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Encrypting Phase 2 "
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"data", req, req_len);
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|
|
encr_req = eap_ttls_encrypt(sm, data, id, req, req_len, reqDataLen);
|
|
free(req);
|
|
|
|
return encr_req;
|
|
}
|
|
|
|
|
|
static u8 * eap_ttls_buildReq(struct eap_sm *sm, void *priv, int id,
|
|
size_t *reqDataLen)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
|
|
switch (data->state) {
|
|
case START:
|
|
return eap_ttls_build_start(sm, data, id, reqDataLen);
|
|
case PHASE1:
|
|
return eap_ttls_build_req(sm, data, id, reqDataLen);
|
|
case PHASE2_METHOD:
|
|
return eap_ttls_build_phase2_eap_req(sm, data, id, reqDataLen);
|
|
case PHASE2_MSCHAPV2_RESP:
|
|
return eap_ttls_build_phase2_mschapv2(sm, data, id,
|
|
reqDataLen);
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: %s - unexpected state %d",
|
|
__func__, data->state);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
|
|
static Boolean eap_ttls_check(struct eap_sm *sm, void *priv,
|
|
u8 *respData, size_t respDataLen)
|
|
{
|
|
struct eap_hdr *resp;
|
|
u8 *pos;
|
|
size_t len;
|
|
|
|
resp = (struct eap_hdr *) respData;
|
|
pos = (u8 *) (resp + 1);
|
|
if (respDataLen < sizeof(*resp) + 2 || *pos != EAP_TYPE_TTLS ||
|
|
(len = ntohs(resp->length)) > respDataLen) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Invalid frame");
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
static void eap_ttls_process_phase2_pap(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
const u8 *user_password,
|
|
size_t user_password_len)
|
|
{
|
|
/* TODO: add support for verifying that the user entry accepts
|
|
* EAP-TTLS/PAP. */
|
|
if (!sm->user || !sm->user->password) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP: No user password "
|
|
"configured");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (sm->user->password_len != user_password_len ||
|
|
memcmp(sm->user->password, user_password, user_password_len) != 0)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP: Invalid user password");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP: Correct user password");
|
|
eap_ttls_state(data, SUCCESS);
|
|
}
|
|
|
|
|
|
static void eap_ttls_process_phase2_chap(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
const u8 *challenge,
|
|
size_t challenge_len,
|
|
const u8 *password,
|
|
size_t password_len)
|
|
{
|
|
u8 *chal, hash[MD5_MAC_LEN];
|
|
const u8 *addr[3];
|
|
size_t len[3];
|
|
|
|
if (challenge == NULL || password == NULL ||
|
|
challenge_len != EAP_TTLS_CHAP_CHALLENGE_LEN ||
|
|
password_len != 1 + EAP_TTLS_CHAP_PASSWORD_LEN) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Invalid CHAP attributes "
|
|
"(challenge len %lu password len %lu)",
|
|
(unsigned long) challenge_len,
|
|
(unsigned long) password_len);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
/* TODO: add support for verifying that the user entry accepts
|
|
* EAP-TTLS/CHAP. */
|
|
if (!sm->user || !sm->user->password) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: No user password "
|
|
"configured");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
chal = eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
|
|
EAP_TTLS_CHAP_CHALLENGE_LEN + 1);
|
|
if (chal == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Failed to generate "
|
|
"challenge from TLS data");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (memcmp(challenge, chal, EAP_TTLS_CHAP_CHALLENGE_LEN) != 0 ||
|
|
password[0] != chal[EAP_TTLS_CHAP_CHALLENGE_LEN]) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Challenge mismatch");
|
|
free(chal);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
free(chal);
|
|
|
|
/* MD5(Ident + Password + Challenge) */
|
|
addr[0] = password;
|
|
len[0] = 1;
|
|
addr[1] = sm->user->password;
|
|
len[1] = sm->user->password_len;
|
|
addr[2] = challenge;
|
|
len[2] = challenge_len;
|
|
md5_vector(3, addr, len, hash);
|
|
|
|
if (memcmp(hash, password + 1, EAP_TTLS_CHAP_PASSWORD_LEN) == 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Correct user password");
|
|
eap_ttls_state(data, SUCCESS);
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Invalid user password");
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
}
|
|
|
|
|
|
static void eap_ttls_process_phase2_mschap(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
u8 *challenge, size_t challenge_len,
|
|
u8 *response, size_t response_len)
|
|
{
|
|
u8 *chal, nt_response[24];
|
|
|
|
if (challenge == NULL || response == NULL ||
|
|
challenge_len != EAP_TTLS_MSCHAP_CHALLENGE_LEN ||
|
|
response_len != EAP_TTLS_MSCHAP_RESPONSE_LEN) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Invalid MS-CHAP "
|
|
"attributes (challenge len %lu response len %lu)",
|
|
(unsigned long) challenge_len,
|
|
(unsigned long) response_len);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
/* TODO: add support for verifying that the user entry accepts
|
|
* EAP-TTLS/MSCHAP. */
|
|
if (!sm->user || !sm->user->password) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: No user password "
|
|
"configured");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
chal = eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
|
|
EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1);
|
|
if (chal == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Failed to generate "
|
|
"challenge from TLS data");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (memcmp(challenge, chal, EAP_TTLS_MSCHAP_CHALLENGE_LEN) != 0 ||
|
|
response[0] != chal[EAP_TTLS_MSCHAP_CHALLENGE_LEN]) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Challenge mismatch");
|
|
free(chal);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
free(chal);
|
|
|
|
nt_challenge_response(challenge, sm->user->password,
|
|
sm->user->password_len, nt_response);
|
|
|
|
if (memcmp(nt_response, response + 2 + 24, 24) == 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Correct response");
|
|
eap_ttls_state(data, SUCCESS);
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Invalid NT-Response");
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAP: Received",
|
|
response + 2 + 24, 24);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAP: Expected",
|
|
nt_response, 24);
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
}
|
|
|
|
|
|
static void eap_ttls_process_phase2_mschapv2(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
u8 *challenge,
|
|
size_t challenge_len,
|
|
u8 *response, size_t response_len)
|
|
{
|
|
u8 *chal, *username, nt_response[24], *pos, *rx_resp, *peer_challenge,
|
|
*auth_challenge;
|
|
size_t username_len;
|
|
int i;
|
|
|
|
if (challenge == NULL || response == NULL ||
|
|
challenge_len != EAP_TTLS_MSCHAPV2_CHALLENGE_LEN ||
|
|
response_len != EAP_TTLS_MSCHAPV2_RESPONSE_LEN) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Invalid MS-CHAP2 "
|
|
"attributes (challenge len %lu response len %lu)",
|
|
(unsigned long) challenge_len,
|
|
(unsigned long) response_len);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
/* TODO: add support for verifying that the user entry accepts
|
|
* EAP-TTLS/MSCHAPV2. */
|
|
if (!sm->user || !sm->user->password) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: No user password "
|
|
"configured");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
/* MSCHAPv2 does not include optional domain name in the
|
|
* challenge-response calculation, so remove domain prefix
|
|
* (if present). */
|
|
username = sm->identity;
|
|
username_len = sm->identity_len;
|
|
pos = username;
|
|
for (i = 0; i < username_len; i++) {
|
|
if (username[i] == '\\') {
|
|
username_len -= i + 1;
|
|
username += i + 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
chal = eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
|
|
EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1);
|
|
if (chal == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Failed to generate "
|
|
"challenge from TLS data");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (memcmp(challenge, chal, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN) != 0 ||
|
|
response[0] != chal[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN]) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Challenge mismatch");
|
|
free(chal);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
free(chal);
|
|
|
|
auth_challenge = challenge;
|
|
peer_challenge = response + 2;
|
|
|
|
wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: User",
|
|
username, username_len);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: auth_challenge",
|
|
auth_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: peer_challenge",
|
|
peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
|
|
|
|
generate_nt_response(auth_challenge, peer_challenge,
|
|
username, username_len,
|
|
sm->user->password, sm->user->password_len,
|
|
nt_response);
|
|
|
|
rx_resp = response + 2 + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 8;
|
|
if (memcmp(nt_response, rx_resp, 24) == 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Correct "
|
|
"NT-Response");
|
|
data->mschapv2_resp_ok = 1;
|
|
|
|
generate_authenticator_response(sm->user->password,
|
|
sm->user->password_len,
|
|
peer_challenge,
|
|
auth_challenge,
|
|
username, username_len,
|
|
nt_response,
|
|
data->mschapv2_auth_response);
|
|
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Invalid "
|
|
"NT-Response");
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: Received",
|
|
rx_resp, 24);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAP-TTLS/MSCHAPV2: Expected",
|
|
nt_response, 24);
|
|
data->mschapv2_resp_ok = 0;
|
|
}
|
|
eap_ttls_state(data, PHASE2_MSCHAPV2_RESP);
|
|
data->mschapv2_ident = response[0];
|
|
}
|
|
|
|
|
|
static int eap_ttls_phase2_eap_init(struct eap_sm *sm,
|
|
struct eap_ttls_data *data, u8 eap_type)
|
|
{
|
|
if (data->phase2_priv && data->phase2_method) {
|
|
data->phase2_method->reset(sm, data->phase2_priv);
|
|
data->phase2_method = NULL;
|
|
data->phase2_priv = NULL;
|
|
}
|
|
data->phase2_method = eap_sm_get_eap_methods(eap_type);
|
|
if (!data->phase2_method)
|
|
return -1;
|
|
|
|
sm->init_phase2 = 1;
|
|
data->phase2_priv = data->phase2_method->init(sm);
|
|
sm->init_phase2 = 0;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void eap_ttls_process_phase2_eap_response(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
u8 *in_data, size_t in_len)
|
|
{
|
|
u8 next_type = EAP_TYPE_NONE;
|
|
struct eap_hdr *hdr;
|
|
u8 *pos;
|
|
size_t left;
|
|
|
|
if (data->phase2_priv == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: %s - Phase2 not "
|
|
"initialized?!", __func__);
|
|
return;
|
|
}
|
|
|
|
hdr = (struct eap_hdr *) in_data;
|
|
pos = (u8 *) (hdr + 1);
|
|
left = in_len - sizeof(*hdr);
|
|
|
|
if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS/EAP: Phase2 type Nak'ed; "
|
|
"allowed types", pos + 1, left - 1);
|
|
eap_sm_process_nak(sm, pos + 1, left - 1);
|
|
if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
|
|
sm->user->methods[sm->user_eap_method_index] !=
|
|
EAP_TYPE_NONE) {
|
|
next_type =
|
|
sm->user->methods[sm->user_eap_method_index++];
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: try EAP type %d",
|
|
next_type);
|
|
eap_ttls_phase2_eap_init(sm, data, next_type);
|
|
} else {
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (data->phase2_method->check(sm, data->phase2_priv, in_data,
|
|
in_len)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: Phase2 check() asked to "
|
|
"ignore the packet");
|
|
return;
|
|
}
|
|
|
|
data->phase2_method->process(sm, data->phase2_priv, in_data, in_len);
|
|
|
|
if (!data->phase2_method->isDone(sm, data->phase2_priv))
|
|
return;
|
|
|
|
if (!data->phase2_method->isSuccess(sm, data->phase2_priv)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: Phase2 method failed");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
switch (data->state) {
|
|
case PHASE2_START:
|
|
if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
|
|
wpa_hexdump_ascii(MSG_DEBUG, "EAP_TTLS: Phase2 "
|
|
"Identity not found in the user "
|
|
"database",
|
|
sm->identity, sm->identity_len);
|
|
eap_ttls_state(data, FAILURE);
|
|
break;
|
|
}
|
|
|
|
eap_ttls_state(data, PHASE2_METHOD);
|
|
next_type = sm->user->methods[0];
|
|
sm->user_eap_method_index = 1;
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: try EAP type %d", next_type);
|
|
break;
|
|
case PHASE2_METHOD:
|
|
eap_ttls_state(data, SUCCESS);
|
|
break;
|
|
case FAILURE:
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: %s - unexpected state %d",
|
|
__func__, data->state);
|
|
break;
|
|
}
|
|
|
|
eap_ttls_phase2_eap_init(sm, data, next_type);
|
|
}
|
|
|
|
|
|
static void eap_ttls_process_phase2_eap(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
const u8 *eap, size_t eap_len)
|
|
{
|
|
struct eap_hdr *hdr;
|
|
size_t len;
|
|
|
|
if (data->state == PHASE2_START) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: initializing Phase 2");
|
|
if (eap_ttls_phase2_eap_init(sm, data, EAP_TYPE_IDENTITY) < 0)
|
|
{
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: failed to "
|
|
"initialize EAP-Identity");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (eap_len < sizeof(*hdr)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: too short Phase 2 EAP "
|
|
"packet (len=%lu)", (unsigned long) eap_len);
|
|
return;
|
|
}
|
|
|
|
hdr = (struct eap_hdr *) eap;
|
|
len = be_to_host16(hdr->length);
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: received Phase 2 EAP: code=%d "
|
|
"identifier=%d length=%lu", hdr->code, hdr->identifier,
|
|
(unsigned long) len);
|
|
if (len > eap_len) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS/EAP: Length mismatch in Phase 2"
|
|
" EAP frame (hdr len=%lu, data len in AVP=%lu)",
|
|
(unsigned long) len, (unsigned long) eap_len);
|
|
return;
|
|
}
|
|
|
|
switch (hdr->code) {
|
|
case EAP_CODE_RESPONSE:
|
|
eap_ttls_process_phase2_eap_response(sm, data, (u8 *) hdr,
|
|
len);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_INFO, "EAP-TTLS/EAP: Unexpected code=%d in "
|
|
"Phase 2 EAP header", hdr->code);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static void eap_ttls_process_phase2(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
struct eap_hdr *resp,
|
|
u8 *in_data, size_t in_len)
|
|
{
|
|
u8 *in_decrypted;
|
|
int buf_len, len_decrypted, res;
|
|
struct eap_ttls_avp parse;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
|
|
" Phase 2", (unsigned long) in_len);
|
|
|
|
res = eap_tls_data_reassemble(sm, &data->ssl, &in_data, &in_len);
|
|
if (res < 0 || res == 1)
|
|
return;
|
|
|
|
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");
|
|
return;
|
|
}
|
|
|
|
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");
|
|
free(in_decrypted);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 EAP",
|
|
in_decrypted, len_decrypted);
|
|
|
|
if (eap_ttls_avp_parse(in_decrypted, len_decrypted, &parse) < 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to parse AVPs");
|
|
free(in_decrypted);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (parse.user_name) {
|
|
free(sm->identity);
|
|
sm->identity = malloc(parse.user_name_len);
|
|
if (sm->identity) {
|
|
memcpy(sm->identity, parse.user_name,
|
|
parse.user_name_len);
|
|
sm->identity_len = parse.user_name_len;
|
|
}
|
|
if (eap_user_get(sm, parse.user_name, parse.user_name_len, 1)
|
|
!= 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 Identity not "
|
|
"found in the user database");
|
|
eap_ttls_state(data, FAILURE);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (parse.eap) {
|
|
eap_ttls_process_phase2_eap(sm, data, parse.eap,
|
|
parse.eap_len);
|
|
} else if (parse.user_password) {
|
|
eap_ttls_process_phase2_pap(sm, data, parse.user_password,
|
|
parse.user_password_len);
|
|
} else if (parse.chap_password) {
|
|
eap_ttls_process_phase2_chap(sm, data,
|
|
parse.chap_challenge,
|
|
parse.chap_challenge_len,
|
|
parse.chap_password,
|
|
parse.chap_password_len);
|
|
} else if (parse.mschap_response) {
|
|
eap_ttls_process_phase2_mschap(sm, data,
|
|
parse.mschap_challenge,
|
|
parse.mschap_challenge_len,
|
|
parse.mschap_response,
|
|
parse.mschap_response_len);
|
|
} else if (parse.mschap2_response) {
|
|
eap_ttls_process_phase2_mschapv2(sm, data,
|
|
parse.mschap_challenge,
|
|
parse.mschap_challenge_len,
|
|
parse.mschap2_response,
|
|
parse.mschap2_response_len);
|
|
}
|
|
|
|
done:
|
|
free(in_decrypted);
|
|
free(parse.eap);
|
|
}
|
|
|
|
|
|
static void eap_ttls_process(struct eap_sm *sm, void *priv,
|
|
u8 *respData, size_t respDataLen)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
struct eap_hdr *resp;
|
|
u8 *pos, flags;
|
|
int left;
|
|
unsigned int tls_msg_len;
|
|
int peer_version;
|
|
|
|
resp = (struct eap_hdr *) respData;
|
|
pos = (u8 *) (resp + 1);
|
|
pos++;
|
|
flags = *pos++;
|
|
left = htons(resp->length) - sizeof(struct eap_hdr) - 2;
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Received packet(len=%lu) - "
|
|
"Flags 0x%02x", (unsigned long) respDataLen, flags);
|
|
peer_version = flags & EAP_PEAP_VERSION_MASK;
|
|
if (peer_version < data->ttls_version) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: peer ver=%d, own ver=%d; "
|
|
"use version %d",
|
|
peer_version, data->ttls_version, peer_version);
|
|
data->ttls_version = peer_version;
|
|
|
|
}
|
|
if (flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
|
|
if (left < 4) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Short frame with TLS "
|
|
"length");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
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;
|
|
}
|
|
|
|
switch (data->state) {
|
|
case PHASE1:
|
|
if (eap_tls_process_helper(sm, &data->ssl, pos, left) < 0) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: TLS processing "
|
|
"failed");
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
break;
|
|
case PHASE2_START:
|
|
case PHASE2_METHOD:
|
|
eap_ttls_process_phase2(sm, data, resp, pos, left);
|
|
break;
|
|
case PHASE2_MSCHAPV2_RESP:
|
|
if (data->mschapv2_resp_ok && left == 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Peer "
|
|
"acknowledged response");
|
|
eap_ttls_state(data, SUCCESS);
|
|
} else if (!data->mschapv2_resp_ok) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Peer "
|
|
"acknowledged error");
|
|
eap_ttls_state(data, FAILURE);
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Unexpected "
|
|
"frame from peer (payload len %d, expected "
|
|
"empty frame)", left);
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected state %d in %s",
|
|
data->state, __func__);
|
|
break;
|
|
}
|
|
|
|
if (tls_connection_get_write_alerts(sm->ssl_ctx, data->ssl.conn) > 1) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Locally detected fatal error "
|
|
"in TLS processing");
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
}
|
|
|
|
|
|
static Boolean eap_ttls_isDone(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
return data->state == SUCCESS || data->state == FAILURE;
|
|
}
|
|
|
|
|
|
static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
u8 *eapKeyData;
|
|
|
|
if (data->state != SUCCESS)
|
|
return NULL;
|
|
|
|
eapKeyData = eap_tls_derive_key(sm, &data->ssl,
|
|
"ttls keying material",
|
|
EAP_TLS_KEY_LEN);
|
|
if (eapKeyData) {
|
|
*len = EAP_TLS_KEY_LEN;
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Derived key",
|
|
eapKeyData, EAP_TLS_KEY_LEN);
|
|
} else {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive key");
|
|
}
|
|
|
|
return eapKeyData;
|
|
}
|
|
|
|
|
|
static Boolean eap_ttls_isSuccess(struct eap_sm *sm, void *priv)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
return data->state == SUCCESS;
|
|
}
|
|
|
|
|
|
const struct eap_method eap_method_ttls =
|
|
{
|
|
.method = EAP_TYPE_TTLS,
|
|
.name = "TTLS",
|
|
.init = eap_ttls_init,
|
|
.reset = eap_ttls_reset,
|
|
.buildReq = eap_ttls_buildReq,
|
|
.check = eap_ttls_check,
|
|
.process = eap_ttls_process,
|
|
.isDone = eap_ttls_isDone,
|
|
.getKey = eap_ttls_getKey,
|
|
.isSuccess = eap_ttls_isSuccess,
|
|
};
|