mirror of
https://github.com/vanhoefm/fragattacks.git
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94d9bfd59b
This makes it easier to build both EAP peer and server functionality into the same project with some toolchains.
1431 lines
38 KiB
C
1431 lines
38 KiB
C
/*
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* hostapd / EAP-TTLS (RFC 5281)
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* Copyright (c) 2004-2008, Jouni Malinen <j@w1.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 "includes.h"
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#include "common.h"
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#include "crypto/ms_funcs.h"
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#include "crypto/sha1.h"
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#include "crypto/tls.h"
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#include "eap_server/eap_i.h"
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#include "eap_server/eap_tls_common.h"
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#include "eap_common/chap.h"
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#include "eap_common/eap_ttls.h"
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/* Maximum supported TTLS version
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* 0 = RFC 5281
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* 1 = draft-funk-eap-ttls-v1-00.txt
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*/
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#ifndef EAP_TTLS_VERSION
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#define EAP_TTLS_VERSION 0 /* TTLSv1 implementation is not yet complete */
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#endif /* EAP_TTLS_VERSION */
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#define MSCHAPV2_KEY_LEN 16
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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, PHASE_FINISHED, SUCCESS, FAILURE
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} state;
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int ttls_version;
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int force_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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int tls_ia_configured;
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struct wpabuf *pending_phase2_eap_resp;
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int tnc_started;
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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 PHASE_FINISHED:
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return "PHASE_FINISHED";
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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 struct wpabuf * eap_ttls_avp_encapsulate(struct wpabuf *resp,
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u32 avp_code, int mandatory)
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{
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struct wpabuf *avp;
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u8 *pos;
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avp = wpabuf_alloc(sizeof(struct ttls_avp) + wpabuf_len(resp) + 4);
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if (avp == NULL) {
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wpabuf_free(resp);
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return NULL;
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}
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pos = eap_ttls_avp_hdr(wpabuf_mhead(avp), avp_code, 0, mandatory,
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wpabuf_len(resp));
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os_memcpy(pos, wpabuf_head(resp), wpabuf_len(resp));
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pos += wpabuf_len(resp);
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AVP_PAD((const u8 *) wpabuf_head(avp), pos);
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wpabuf_free(resp);
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wpabuf_put(avp, pos - (u8 *) wpabuf_head(avp));
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return avp;
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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(struct wpabuf *buf, 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 = wpabuf_mhead(buf);
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left = wpabuf_len(buf);
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os_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 ((int) 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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goto fail;
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}
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if (avp_length < sizeof(*avp)) {
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wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length "
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"%d", avp_length);
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goto fail;
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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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goto fail;
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}
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vendor_id = be_to_host32(* (be32 *) 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 = os_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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goto fail;
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}
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os_memcpy(parse->eap, dpos, dlen);
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parse->eap_len = dlen;
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} else {
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u8 *neweap = os_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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goto fail;
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}
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os_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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goto fail;
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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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fail:
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os_free(parse->eap);
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parse->eap = NULL;
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return -1;
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}
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static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm,
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struct eap_ttls_data *data, size_t len)
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{
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struct tls_keys keys;
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u8 *challenge, *rnd;
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if (data->ttls_version == 0) {
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return eap_server_tls_derive_key(sm, &data->ssl,
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"ttls challenge", len);
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}
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os_memset(&keys, 0, sizeof(keys));
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if (tls_connection_get_keys(sm->ssl_ctx, data->ssl.conn, &keys) ||
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keys.client_random == NULL || keys.server_random == NULL ||
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keys.inner_secret == NULL) {
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wpa_printf(MSG_INFO, "EAP-TTLS: Could not get inner secret, "
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"client random, or server random to derive "
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"implicit challenge");
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return NULL;
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}
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rnd = os_malloc(keys.client_random_len + keys.server_random_len);
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challenge = os_malloc(len);
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if (rnd == NULL || challenge == NULL) {
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wpa_printf(MSG_INFO, "EAP-TTLS: No memory for implicit "
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"challenge derivation");
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os_free(rnd);
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os_free(challenge);
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return NULL;
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}
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os_memcpy(rnd, keys.server_random, keys.server_random_len);
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os_memcpy(rnd + keys.server_random_len, keys.client_random,
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keys.client_random_len);
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if (tls_prf(keys.inner_secret, keys.inner_secret_len,
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"inner application challenge", rnd,
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keys.client_random_len + keys.server_random_len,
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challenge, len)) {
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wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive implicit "
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"challenge");
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os_free(rnd);
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os_free(challenge);
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return NULL;
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}
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os_free(rnd);
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wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived implicit challenge",
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challenge, len);
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return challenge;
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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 = os_zalloc(sizeof(*data));
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if (data == NULL)
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return NULL;
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data->ttls_version = EAP_TTLS_VERSION;
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data->force_version = -1;
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if (sm->user && sm->user->force_version >= 0) {
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data->force_version = sm->user->force_version;
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wpa_printf(MSG_DEBUG, "EAP-TTLS: forcing version %d",
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data->force_version);
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data->ttls_version = data->force_version;
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}
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data->state = START;
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if (!(tls_capabilities(sm->ssl_ctx) & TLS_CAPABILITY_IA) &&
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data->ttls_version > 0) {
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if (data->force_version > 0) {
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wpa_printf(MSG_INFO, "EAP-TTLS: Forced TTLSv%d and "
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"TLS library does not support TLS/IA.",
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data->force_version);
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eap_ttls_reset(sm, data);
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return NULL;
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}
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data->ttls_version = 0;
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}
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if (eap_server_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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|
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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_server_tls_ssl_deinit(sm, &data->ssl);
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wpabuf_free(data->pending_phase2_eap_resp);
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os_free(data);
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}
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|
|
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static struct wpabuf * eap_ttls_build_start(struct eap_sm *sm,
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struct eap_ttls_data *data, u8 id)
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{
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struct wpabuf *req;
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req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TTLS, 1,
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EAP_CODE_REQUEST, id);
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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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wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->ttls_version);
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|
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eap_ttls_state(data, PHASE1);
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return req;
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}
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|
|
|
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static struct wpabuf * eap_ttls_build_phase2_eap_req(
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struct eap_sm *sm, struct eap_ttls_data *data, u8 id)
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{
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struct wpabuf *buf, *encr_req;
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|
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buf = data->phase2_method->buildReq(sm, data->phase2_priv, id);
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if (buf == NULL)
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return NULL;
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wpa_hexdump_buf_key(MSG_DEBUG,
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"EAP-TTLS/EAP: Encapsulate Phase 2 data", buf);
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buf = eap_ttls_avp_encapsulate(buf, RADIUS_ATTR_EAP_MESSAGE, 1);
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if (buf == NULL) {
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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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|
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wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS/EAP: Encrypt encapsulated "
|
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"Phase 2 data", buf);
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|
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encr_req = eap_server_tls_encrypt(sm, &data->ssl, buf);
|
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wpabuf_free(buf);
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|
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return encr_req;
|
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}
|
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|
|
|
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static struct wpabuf * eap_ttls_build_phase2_mschapv2(
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struct eap_sm *sm, struct eap_ttls_data *data)
|
|
{
|
|
struct wpabuf *encr_req, msgbuf;
|
|
u8 *req, *pos, *end;
|
|
int ret;
|
|
|
|
pos = req = os_malloc(100);
|
|
if (req == NULL)
|
|
return NULL;
|
|
end = req + 100;
|
|
|
|
if (data->mschapv2_resp_ok) {
|
|
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_SUCCESS,
|
|
RADIUS_VENDOR_ID_MICROSOFT, 1, 43);
|
|
*pos++ = data->mschapv2_ident;
|
|
ret = os_snprintf((char *) pos, end - pos, "S=");
|
|
if (ret >= 0 && ret < end - pos)
|
|
pos += ret;
|
|
pos += wpa_snprintf_hex_uppercase(
|
|
(char *) pos, end - pos, data->mschapv2_auth_response,
|
|
sizeof(data->mschapv2_auth_response));
|
|
} else {
|
|
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_ERROR,
|
|
RADIUS_VENDOR_ID_MICROSOFT, 1, 6);
|
|
os_memcpy(pos, "Failed", 6);
|
|
pos += 6;
|
|
AVP_PAD(req, pos);
|
|
}
|
|
|
|
wpabuf_set(&msgbuf, req, pos - req);
|
|
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Encrypting Phase 2 "
|
|
"data", &msgbuf);
|
|
|
|
encr_req = eap_server_tls_encrypt(sm, &data->ssl, &msgbuf);
|
|
os_free(req);
|
|
|
|
return encr_req;
|
|
}
|
|
|
|
|
|
static struct wpabuf * eap_ttls_build_phase_finished(
|
|
struct eap_sm *sm, struct eap_ttls_data *data, int final)
|
|
{
|
|
return tls_connection_ia_send_phase_finished(sm->ssl_ctx,
|
|
data->ssl.conn, final);
|
|
}
|
|
|
|
|
|
static struct wpabuf * eap_ttls_buildReq(struct eap_sm *sm, void *priv, u8 id)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
|
|
if (data->ssl.state == FRAG_ACK) {
|
|
return eap_server_tls_build_ack(id, EAP_TYPE_TTLS,
|
|
data->ttls_version);
|
|
}
|
|
|
|
if (data->ssl.state == WAIT_FRAG_ACK) {
|
|
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TTLS,
|
|
data->ttls_version, id);
|
|
}
|
|
|
|
switch (data->state) {
|
|
case START:
|
|
return eap_ttls_build_start(sm, data, id);
|
|
case PHASE1:
|
|
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase1 done, "
|
|
"starting Phase2");
|
|
eap_ttls_state(data, PHASE2_START);
|
|
}
|
|
break;
|
|
case PHASE2_METHOD:
|
|
wpabuf_free(data->ssl.tls_out);
|
|
data->ssl.tls_out_pos = 0;
|
|
data->ssl.tls_out = eap_ttls_build_phase2_eap_req(sm, data,
|
|
id);
|
|
break;
|
|
case PHASE2_MSCHAPV2_RESP:
|
|
wpabuf_free(data->ssl.tls_out);
|
|
data->ssl.tls_out_pos = 0;
|
|
data->ssl.tls_out = eap_ttls_build_phase2_mschapv2(sm, data);
|
|
break;
|
|
case PHASE_FINISHED:
|
|
wpabuf_free(data->ssl.tls_out);
|
|
data->ssl.tls_out_pos = 0;
|
|
data->ssl.tls_out = eap_ttls_build_phase_finished(sm, data, 1);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: %s - unexpected state %d",
|
|
__func__, data->state);
|
|
return NULL;
|
|
}
|
|
|
|
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_TTLS,
|
|
data->ttls_version, id);
|
|
}
|
|
|
|
|
|
static Boolean eap_ttls_check(struct eap_sm *sm, void *priv,
|
|
struct wpabuf *respData)
|
|
{
|
|
const u8 *pos;
|
|
size_t len;
|
|
|
|
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TTLS, respData, &len);
|
|
if (pos == NULL || len < 1) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Invalid frame");
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
static int eap_ttls_ia_permute_inner_secret(struct eap_sm *sm,
|
|
struct eap_ttls_data *data,
|
|
const u8 *key, size_t key_len)
|
|
{
|
|
u8 *buf;
|
|
size_t buf_len;
|
|
int ret;
|
|
|
|
if (key) {
|
|
buf_len = 2 + key_len;
|
|
buf = os_malloc(buf_len);
|
|
if (buf == NULL)
|
|
return -1;
|
|
WPA_PUT_BE16(buf, key_len);
|
|
os_memcpy(buf + 2, key, key_len);
|
|
} else {
|
|
buf = NULL;
|
|
buf_len = 0;
|
|
}
|
|
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Session keys for TLS/IA inner "
|
|
"secret permutation", buf, buf_len);
|
|
ret = tls_connection_ia_permute_inner_secret(sm->ssl_ctx,
|
|
data->ssl.conn,
|
|
buf, buf_len);
|
|
os_free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
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)
|
|
{
|
|
if (!sm->user || !sm->user->password || sm->user->password_hash ||
|
|
!(sm->user->ttls_auth & EAP_TTLS_AUTH_PAP)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP: No plaintext user "
|
|
"password configured");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (sm->user->password_len != user_password_len ||
|
|
os_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, data->ttls_version > 0 ? PHASE_FINISHED :
|
|
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[CHAP_MD5_LEN];
|
|
|
|
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;
|
|
}
|
|
|
|
if (!sm->user || !sm->user->password || sm->user->password_hash ||
|
|
!(sm->user->ttls_auth & EAP_TTLS_AUTH_CHAP)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: No plaintext user "
|
|
"password configured");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
chal = eap_ttls_implicit_challenge(sm, data,
|
|
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 (os_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");
|
|
os_free(chal);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
os_free(chal);
|
|
|
|
/* MD5(Ident + Password + Challenge) */
|
|
chap_md5(password[0], sm->user->password, sm->user->password_len,
|
|
challenge, challenge_len, hash);
|
|
|
|
if (os_memcmp(hash, password + 1, EAP_TTLS_CHAP_PASSWORD_LEN) == 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP: Correct user password");
|
|
eap_ttls_state(data, data->ttls_version > 0 ? PHASE_FINISHED :
|
|
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;
|
|
}
|
|
|
|
if (!sm->user || !sm->user->password ||
|
|
!(sm->user->ttls_auth & EAP_TTLS_AUTH_MSCHAP)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: No user password "
|
|
"configured");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
chal = eap_ttls_implicit_challenge(sm, data,
|
|
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 (os_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");
|
|
os_free(chal);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
os_free(chal);
|
|
|
|
if (sm->user->password_hash)
|
|
challenge_response(challenge, sm->user->password, nt_response);
|
|
else
|
|
nt_challenge_response(challenge, sm->user->password,
|
|
sm->user->password_len, nt_response);
|
|
|
|
if (os_memcmp(nt_response, response + 2 + 24, 24) == 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP: Correct response");
|
|
eap_ttls_state(data, data->ttls_version > 0 ? PHASE_FINISHED :
|
|
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], *rx_resp, *peer_challenge,
|
|
*auth_challenge;
|
|
size_t username_len, 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;
|
|
}
|
|
|
|
if (!sm->user || !sm->user->password ||
|
|
!(sm->user->ttls_auth & EAP_TTLS_AUTH_MSCHAPV2)) {
|
|
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;
|
|
for (i = 0; i < username_len; i++) {
|
|
if (username[i] == '\\') {
|
|
username_len -= i + 1;
|
|
username += i + 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
chal = eap_ttls_implicit_challenge(
|
|
sm, data, 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 (os_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");
|
|
os_free(chal);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
os_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);
|
|
|
|
if (sm->user->password_hash) {
|
|
generate_nt_response_pwhash(auth_challenge, peer_challenge,
|
|
username, username_len,
|
|
sm->user->password,
|
|
nt_response);
|
|
} else {
|
|
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 (os_memcmp(nt_response, rx_resp, 24) == 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Correct "
|
|
"NT-Response");
|
|
data->mschapv2_resp_ok = 1;
|
|
if (data->ttls_version > 0) {
|
|
const u8 *pw_hash;
|
|
u8 pw_hash_buf[16], pw_hash_hash[16], master_key[16];
|
|
u8 session_key[2 * MSCHAPV2_KEY_LEN];
|
|
|
|
if (sm->user->password_hash)
|
|
pw_hash = sm->user->password;
|
|
else {
|
|
nt_password_hash(sm->user->password,
|
|
sm->user->password_len,
|
|
pw_hash_buf);
|
|
pw_hash = pw_hash_buf;
|
|
}
|
|
hash_nt_password_hash(pw_hash, pw_hash_hash);
|
|
get_master_key(pw_hash_hash, nt_response, master_key);
|
|
get_asymetric_start_key(master_key, session_key,
|
|
MSCHAPV2_KEY_LEN, 0, 0);
|
|
get_asymetric_start_key(master_key,
|
|
session_key + MSCHAPV2_KEY_LEN,
|
|
MSCHAPV2_KEY_LEN, 1, 0);
|
|
eap_ttls_ia_permute_inner_secret(sm, data,
|
|
session_key,
|
|
sizeof(session_key));
|
|
}
|
|
|
|
if (sm->user->password_hash) {
|
|
generate_authenticator_response_pwhash(
|
|
sm->user->password,
|
|
peer_challenge, auth_challenge,
|
|
username, username_len, nt_response,
|
|
data->mschapv2_auth_response);
|
|
} else {
|
|
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,
|
|
EapType 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_server_get_eap_method(EAP_VENDOR_IETF,
|
|
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 data->phase2_priv == NULL ? -1 : 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;
|
|
struct wpabuf buf;
|
|
const struct eap_method *m = data->phase2_method;
|
|
void *priv = data->phase2_priv;
|
|
|
|
if (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);
|
|
|
|
if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
|
|
left = in_len - sizeof(*hdr);
|
|
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].method !=
|
|
EAP_TYPE_NONE) {
|
|
next_type = sm->user->methods[
|
|
sm->user_eap_method_index++].method;
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: try EAP type %d",
|
|
next_type);
|
|
if (eap_ttls_phase2_eap_init(sm, data, next_type)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to "
|
|
"initialize EAP type %d",
|
|
next_type);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
} else {
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
return;
|
|
}
|
|
|
|
wpabuf_set(&buf, in_data, in_len);
|
|
|
|
if (m->check(sm, priv, &buf)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: Phase2 check() asked to "
|
|
"ignore the packet");
|
|
return;
|
|
}
|
|
|
|
m->process(sm, priv, &buf);
|
|
|
|
if (sm->method_pending == METHOD_PENDING_WAIT) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/EAP: Phase2 method is in "
|
|
"pending wait state - save decrypted response");
|
|
wpabuf_free(data->pending_phase2_eap_resp);
|
|
data->pending_phase2_eap_resp = wpabuf_dup(&buf);
|
|
}
|
|
|
|
if (!m->isDone(sm, priv))
|
|
return;
|
|
|
|
if (!m->isSuccess(sm, 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].method;
|
|
sm->user_eap_method_index = 1;
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: try EAP type %d", next_type);
|
|
if (eap_ttls_phase2_eap_init(sm, data, next_type)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to initialize "
|
|
"EAP type %d", next_type);
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
break;
|
|
case PHASE2_METHOD:
|
|
if (data->ttls_version > 0) {
|
|
if (m->getKey) {
|
|
u8 *key;
|
|
size_t key_len;
|
|
key = m->getKey(sm, priv, &key_len);
|
|
eap_ttls_ia_permute_inner_secret(sm, data,
|
|
key, key_len);
|
|
}
|
|
eap_ttls_state(data, PHASE_FINISHED);
|
|
} else
|
|
eap_ttls_state(data, SUCCESS);
|
|
break;
|
|
case FAILURE:
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: %s - unexpected state %d",
|
|
__func__, data->state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
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 wpabuf *in_buf)
|
|
{
|
|
struct wpabuf *in_decrypted;
|
|
struct eap_ttls_avp parse;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
|
|
" Phase 2", (unsigned long) wpabuf_len(in_buf));
|
|
|
|
if (data->pending_phase2_eap_resp) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 EAP response "
|
|
"- skip decryption and use old data");
|
|
eap_ttls_process_phase2_eap(
|
|
sm, data, wpabuf_head(data->pending_phase2_eap_resp),
|
|
wpabuf_len(data->pending_phase2_eap_resp));
|
|
wpabuf_free(data->pending_phase2_eap_resp);
|
|
data->pending_phase2_eap_resp = NULL;
|
|
return;
|
|
}
|
|
|
|
in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
|
|
in_buf);
|
|
if (in_decrypted == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to decrypt Phase 2 "
|
|
"data");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (data->state == PHASE_FINISHED) {
|
|
if (wpabuf_len(in_decrypted) == 0 &&
|
|
tls_connection_ia_final_phase_finished(sm->ssl_ctx,
|
|
data->ssl.conn)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: FinalPhaseFinished "
|
|
"received");
|
|
eap_ttls_state(data, SUCCESS);
|
|
} else {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Did not receive valid "
|
|
"FinalPhaseFinished");
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
|
|
wpabuf_free(in_decrypted);
|
|
return;
|
|
}
|
|
|
|
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 EAP",
|
|
in_decrypted);
|
|
|
|
if (eap_ttls_avp_parse(in_decrypted, &parse) < 0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to parse AVPs");
|
|
wpabuf_free(in_decrypted);
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
if (parse.user_name) {
|
|
os_free(sm->identity);
|
|
sm->identity = os_malloc(parse.user_name_len);
|
|
if (sm->identity) {
|
|
os_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;
|
|
}
|
|
}
|
|
|
|
#ifdef EAP_SERVER_TNC
|
|
if (data->tnc_started && parse.eap == NULL) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: TNC started but no EAP "
|
|
"response from peer");
|
|
eap_ttls_state(data, FAILURE);
|
|
goto done;
|
|
}
|
|
#endif /* EAP_SERVER_TNC */
|
|
|
|
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:
|
|
wpabuf_free(in_decrypted);
|
|
os_free(parse.eap);
|
|
}
|
|
|
|
|
|
static void eap_ttls_start_tnc(struct eap_sm *sm, struct eap_ttls_data *data)
|
|
{
|
|
#ifdef EAP_SERVER_TNC
|
|
if (!sm->tnc || data->state != SUCCESS || data->tnc_started)
|
|
return;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Initialize TNC");
|
|
if (eap_ttls_phase2_eap_init(sm, data, EAP_TYPE_TNC)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to initialize TNC");
|
|
eap_ttls_state(data, FAILURE);
|
|
return;
|
|
}
|
|
|
|
data->tnc_started = 1;
|
|
eap_ttls_state(data, PHASE2_METHOD);
|
|
#endif /* EAP_SERVER_TNC */
|
|
}
|
|
|
|
|
|
static int eap_ttls_process_version(struct eap_sm *sm, void *priv,
|
|
int peer_version)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
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 (data->ttls_version > 0 && !data->tls_ia_configured) {
|
|
if (tls_connection_set_ia(sm->ssl_ctx, data->ssl.conn, 1)) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to enable "
|
|
"TLS/IA");
|
|
return -1;
|
|
}
|
|
data->tls_ia_configured = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void eap_ttls_process_msg(struct eap_sm *sm, void *priv,
|
|
const struct wpabuf *respData)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
|
|
switch (data->state) {
|
|
case PHASE1:
|
|
if (eap_server_tls_phase1(sm, &data->ssl) < 0)
|
|
eap_ttls_state(data, FAILURE);
|
|
break;
|
|
case PHASE2_START:
|
|
case PHASE2_METHOD:
|
|
case PHASE_FINISHED:
|
|
eap_ttls_process_phase2(sm, data, data->ssl.tls_in);
|
|
eap_ttls_start_tnc(sm, data);
|
|
break;
|
|
case PHASE2_MSCHAPV2_RESP:
|
|
if (data->mschapv2_resp_ok && wpabuf_len(data->ssl.tls_in) ==
|
|
0) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Peer "
|
|
"acknowledged response");
|
|
eap_ttls_state(data, data->ttls_version > 0 ?
|
|
PHASE_FINISHED : 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 %lu, "
|
|
"expected empty frame)",
|
|
(unsigned long)
|
|
wpabuf_len(data->ssl.tls_in));
|
|
eap_ttls_state(data, FAILURE);
|
|
}
|
|
eap_ttls_start_tnc(sm, data);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected state %d in %s",
|
|
data->state, __func__);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static void eap_ttls_process(struct eap_sm *sm, void *priv,
|
|
struct wpabuf *respData)
|
|
{
|
|
struct eap_ttls_data *data = priv;
|
|
if (eap_server_tls_process(sm, &data->ssl, respData, data,
|
|
EAP_TYPE_TTLS, eap_ttls_process_version,
|
|
eap_ttls_process_msg) < 0)
|
|
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_v1_derive_key(struct eap_sm *sm,
|
|
struct eap_ttls_data *data)
|
|
{
|
|
struct tls_keys keys;
|
|
u8 *rnd, *key;
|
|
|
|
os_memset(&keys, 0, sizeof(keys));
|
|
if (tls_connection_get_keys(sm->ssl_ctx, data->ssl.conn, &keys) ||
|
|
keys.client_random == NULL || keys.server_random == NULL ||
|
|
keys.inner_secret == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: Could not get inner secret, "
|
|
"client random, or server random to derive keying "
|
|
"material");
|
|
return NULL;
|
|
}
|
|
|
|
rnd = os_malloc(keys.client_random_len + keys.server_random_len);
|
|
key = os_malloc(EAP_TLS_KEY_LEN);
|
|
if (rnd == NULL || key == NULL) {
|
|
wpa_printf(MSG_INFO, "EAP-TTLS: No memory for key derivation");
|
|
os_free(rnd);
|
|
os_free(key);
|
|
return NULL;
|
|
}
|
|
os_memcpy(rnd, keys.client_random, keys.client_random_len);
|
|
os_memcpy(rnd + keys.client_random_len, keys.server_random,
|
|
keys.server_random_len);
|
|
|
|
if (tls_prf(keys.inner_secret, keys.inner_secret_len,
|
|
"ttls v1 keying material", rnd, keys.client_random_len +
|
|
keys.server_random_len, key, EAP_TLS_KEY_LEN)) {
|
|
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive key");
|
|
os_free(rnd);
|
|
os_free(key);
|
|
return NULL;
|
|
}
|
|
|
|
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: client/server random",
|
|
rnd, keys.client_random_len + keys.server_random_len);
|
|
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: TLS/IA inner secret",
|
|
keys.inner_secret, keys.inner_secret_len);
|
|
|
|
os_free(rnd);
|
|
|
|
return key;
|
|
}
|
|
|
|
|
|
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;
|
|
|
|
if (data->ttls_version == 0) {
|
|
eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
|
|
"ttls keying material",
|
|
EAP_TLS_KEY_LEN);
|
|
} else {
|
|
eapKeyData = eap_ttls_v1_derive_key(sm, data);
|
|
}
|
|
|
|
if (eapKeyData) {
|
|
*len = EAP_TLS_KEY_LEN;
|
|
wpa_hexdump_key(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;
|
|
}
|
|
|
|
|
|
int eap_server_ttls_register(void)
|
|
{
|
|
struct eap_method *eap;
|
|
int ret;
|
|
|
|
eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
|
|
EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS");
|
|
if (eap == NULL)
|
|
return -1;
|
|
|
|
eap->init = eap_ttls_init;
|
|
eap->reset = eap_ttls_reset;
|
|
eap->buildReq = eap_ttls_buildReq;
|
|
eap->check = eap_ttls_check;
|
|
eap->process = eap_ttls_process;
|
|
eap->isDone = eap_ttls_isDone;
|
|
eap->getKey = eap_ttls_getKey;
|
|
eap->isSuccess = eap_ttls_isSuccess;
|
|
|
|
ret = eap_server_method_register(eap);
|
|
if (ret)
|
|
eap_server_method_free(eap);
|
|
return ret;
|
|
}
|