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fragattacks/src/eap_peer/eap_ttls.c

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/*
* EAP peer method: EAP-TTLS (RFC 5281)
* Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/ms_funcs.h"
#include "crypto/sha1.h"
#include "crypto/tls.h"
#include "eap_common/chap.h"
#include "eap_common/eap_ttls.h"
#include "mschapv2.h"
#include "eap_i.h"
#include "eap_tls_common.h"
#include "eap_config.h"
/* Maximum supported TTLS version
* 0 = RFC 5281
* 1 = draft-funk-eap-ttls-v1-00.txt
*/
#ifndef EAP_TTLS_VERSION
#define EAP_TTLS_VERSION 0 /* TTLSv1 implementation is not yet complete */
#endif /* EAP_TTLS_VERSION */
#define MSCHAPV2_KEY_LEN 16
#define MSCHAPV2_NT_RESPONSE_LEN 24
static void eap_ttls_deinit(struct eap_sm *sm, void *priv);
struct eap_ttls_data {
struct eap_ssl_data ssl;
int ssl_initialized;
int ttls_version, force_ttls_version;
const struct eap_method *phase2_method;
void *phase2_priv;
int phase2_success;
int phase2_start;
enum phase2_types {
EAP_TTLS_PHASE2_EAP,
EAP_TTLS_PHASE2_MSCHAPV2,
EAP_TTLS_PHASE2_MSCHAP,
EAP_TTLS_PHASE2_PAP,
EAP_TTLS_PHASE2_CHAP
} phase2_type;
struct eap_method_type phase2_eap_type;
struct eap_method_type *phase2_eap_types;
size_t num_phase2_eap_types;
u8 auth_response[MSCHAPV2_AUTH_RESPONSE_LEN];
int auth_response_valid;
u8 master_key[MSCHAPV2_MASTER_KEY_LEN]; /* MSCHAPv2 master key */
u8 ident;
int resuming; /* starting a resumed session */
int reauth; /* reauthentication */
u8 *key_data;
struct wpabuf *pending_phase2_req;
#ifdef EAP_TNC
int ready_for_tnc;
int tnc_started;
#endif /* EAP_TNC */
};
static void * eap_ttls_init(struct eap_sm *sm)
{
struct eap_ttls_data *data;
struct eap_peer_config *config = eap_get_config(sm);
char *selected;
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
data->ttls_version = EAP_TTLS_VERSION;
data->force_ttls_version = -1;
selected = "EAP";
data->phase2_type = EAP_TTLS_PHASE2_EAP;
#if EAP_TTLS_VERSION > 0
if (config && config->phase1) {
const char *pos = os_strstr(config->phase1, "ttlsver=");
if (pos) {
data->force_ttls_version = atoi(pos + 8);
data->ttls_version = data->force_ttls_version;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Forced TTLS version "
"%d", data->force_ttls_version);
}
}
#endif /* EAP_TTLS_VERSION */
if (config && config->phase2) {
if (os_strstr(config->phase2, "autheap=")) {
selected = "EAP";
data->phase2_type = EAP_TTLS_PHASE2_EAP;
} else if (os_strstr(config->phase2, "auth=MSCHAPV2")) {
selected = "MSCHAPV2";
data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2;
} else if (os_strstr(config->phase2, "auth=MSCHAP")) {
selected = "MSCHAP";
data->phase2_type = EAP_TTLS_PHASE2_MSCHAP;
} else if (os_strstr(config->phase2, "auth=PAP")) {
selected = "PAP";
data->phase2_type = EAP_TTLS_PHASE2_PAP;
} else if (os_strstr(config->phase2, "auth=CHAP")) {
selected = "CHAP";
data->phase2_type = EAP_TTLS_PHASE2_CHAP;
}
}
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected);
if (data->phase2_type == EAP_TTLS_PHASE2_EAP) {
if (eap_peer_select_phase2_methods(config, "autheap=",
&data->phase2_eap_types,
&data->num_phase2_eap_types)
< 0) {
eap_ttls_deinit(sm, data);
return NULL;
}
data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
data->phase2_eap_type.method = EAP_TYPE_NONE;
}
#if EAP_TTLS_VERSION > 0
if (!(tls_capabilities(sm->ssl_ctx) & TLS_CAPABILITY_IA) &&
data->ttls_version > 0) {
if (data->force_ttls_version > 0) {
wpa_printf(MSG_INFO, "EAP-TTLS: Forced TTLSv%d and "
"TLS library does not support TLS/IA.",
data->force_ttls_version);
eap_ttls_deinit(sm, data);
return NULL;
}
data->ttls_version = 0;
}
#endif /* EAP_TTLS_VERSION */
return data;
}
static void eap_ttls_phase2_eap_deinit(struct eap_sm *sm,
struct eap_ttls_data *data)
{
if (data->phase2_priv && data->phase2_method) {
data->phase2_method->deinit(sm, data->phase2_priv);
data->phase2_method = NULL;
data->phase2_priv = NULL;
}
}
static void eap_ttls_deinit(struct eap_sm *sm, void *priv)
{
struct eap_ttls_data *data = priv;
if (data == NULL)
return;
eap_ttls_phase2_eap_deinit(sm, data);
os_free(data->phase2_eap_types);
if (data->ssl_initialized)
eap_peer_tls_ssl_deinit(sm, &data->ssl);
os_free(data->key_data);
wpabuf_free(data->pending_phase2_req);
os_free(data);
}
static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id,
int mandatory, size_t len)
{
struct ttls_avp_vendor *avp;
u8 flags;
size_t hdrlen;
avp = (struct ttls_avp_vendor *) avphdr;
flags = mandatory ? AVP_FLAGS_MANDATORY : 0;
if (vendor_id) {
flags |= AVP_FLAGS_VENDOR;
hdrlen = sizeof(*avp);
avp->vendor_id = host_to_be32(vendor_id);
} else {
hdrlen = sizeof(struct ttls_avp);
}
avp->avp_code = host_to_be32(avp_code);
avp->avp_length = host_to_be32((flags << 24) | (hdrlen + len));
return avphdr + hdrlen;
}
static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code,
u32 vendor_id, int mandatory,
const u8 *data, size_t len)
{
u8 *pos;
pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len);
os_memcpy(pos, data, len);
pos += len;
AVP_PAD(start, pos);
return pos;
}
static int eap_ttls_avp_encapsulate(struct wpabuf **resp, u32 avp_code,
int mandatory)
{
struct wpabuf *msg;
u8 *avp, *pos;
msg = wpabuf_alloc(sizeof(struct ttls_avp) + wpabuf_len(*resp) + 4);
if (msg == NULL) {
wpabuf_free(*resp);
*resp = NULL;
return -1;
}
avp = wpabuf_mhead(msg);
pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, wpabuf_len(*resp));
os_memcpy(pos, wpabuf_head(*resp), wpabuf_len(*resp));
pos += wpabuf_len(*resp);
AVP_PAD(avp, pos);
wpabuf_free(*resp);
wpabuf_put(msg, pos - avp);
*resp = msg;
return 0;
}
#if EAP_TTLS_VERSION > 0
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;
}
#endif /* EAP_TTLS_VERSION */
static int eap_ttls_v0_derive_key(struct eap_sm *sm,
struct eap_ttls_data *data)
{
os_free(data->key_data);
data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
"ttls keying material",
EAP_TLS_KEY_LEN);
if (!data->key_data) {
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to derive key");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
data->key_data, EAP_TLS_KEY_LEN);
return 0;
}
#if EAP_TTLS_VERSION > 0
static int eap_ttls_v1_derive_key(struct eap_sm *sm,
struct eap_ttls_data *data)
{
struct tls_keys keys;
u8 *rnd;
os_free(data->key_data);
data->key_data = NULL;
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 -1;
}
rnd = os_malloc(keys.client_random_len + keys.server_random_len);
data->key_data = os_malloc(EAP_TLS_KEY_LEN);
if (rnd == NULL || data->key_data == NULL) {
wpa_printf(MSG_INFO, "EAP-TTLS: No memory for key derivation");
os_free(rnd);
os_free(data->key_data);
data->key_data = NULL;
return -1;
}
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, data->key_data, EAP_TLS_KEY_LEN)) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive key");
os_free(rnd);
os_free(data->key_data);
data->key_data = NULL;
return -1;
}
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);
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key",
data->key_data, EAP_TLS_KEY_LEN);
return 0;
}
#endif /* EAP_TTLS_VERSION */
static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm,
struct eap_ttls_data *data, size_t len)
{
#if EAP_TTLS_VERSION > 0
struct tls_keys keys;
u8 *challenge, *rnd;
#endif /* EAP_TTLS_VERSION */
if (data->ttls_version == 0) {
return eap_peer_tls_derive_key(sm, &data->ssl,
"ttls challenge", len);
}
#if EAP_TTLS_VERSION > 0
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 "
"implicit challenge");
return NULL;
}
rnd = os_malloc(keys.client_random_len + keys.server_random_len);
challenge = os_malloc(len);
if (rnd == NULL || challenge == NULL) {
wpa_printf(MSG_INFO, "EAP-TTLS: No memory for implicit "
"challenge derivation");
os_free(rnd);
os_free(challenge);
return NULL;
}
os_memcpy(rnd, keys.server_random, keys.server_random_len);
os_memcpy(rnd + keys.server_random_len, keys.client_random,
keys.client_random_len);
if (tls_prf(keys.inner_secret, keys.inner_secret_len,
"inner application challenge", rnd,
keys.client_random_len + keys.server_random_len,
challenge, len)) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Failed to derive implicit "
"challenge");
os_free(rnd);
os_free(challenge);
return NULL;
}
os_free(rnd);
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived implicit challenge",
challenge, len);
return challenge;
#else /* EAP_TTLS_VERSION */
return NULL;
#endif /* EAP_TTLS_VERSION */
}
static void eap_ttlsv1_phase2_eap_finish(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret)
{
#if EAP_TTLS_VERSION > 0
if (data->ttls_version > 0) {
const struct eap_method *m = data->phase2_method;
void *priv = data->phase2_priv;
/* TTLSv1 requires TLS/IA FinalPhaseFinished */
if (ret->decision == DECISION_UNCOND_SUCC)
ret->decision = DECISION_COND_SUCC;
ret->methodState = METHOD_CONT;
if (ret->decision == DECISION_COND_SUCC &&
m->isKeyAvailable && m->getKey &&
m->isKeyAvailable(sm, priv)) {
u8 *key;
size_t key_len;
key = m->getKey(sm, priv, &key_len);
if (key) {
eap_ttls_ia_permute_inner_secret(
sm, data, key, key_len);
os_free(key);
}
}
}
#endif /* EAP_TTLS_VERSION */
}
static void eap_ttls_phase2_select_eap_method(struct eap_ttls_data *data,
u8 method)
{
size_t i;
for (i = 0; i < data->num_phase2_eap_types; i++) {
if (data->phase2_eap_types[i].vendor != EAP_VENDOR_IETF ||
data->phase2_eap_types[i].method != method)
continue;
data->phase2_eap_type.vendor =
data->phase2_eap_types[i].vendor;
data->phase2_eap_type.method =
data->phase2_eap_types[i].method;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
"Phase 2 EAP vendor %d method %d",
data->phase2_eap_type.vendor,
data->phase2_eap_type.method);
break;
}
}
static int eap_ttls_phase2_eap_process(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct eap_hdr *hdr, size_t len,
struct wpabuf **resp)
{
struct wpabuf msg;
struct eap_method_ret iret;
os_memset(&iret, 0, sizeof(iret));
wpabuf_set(&msg, hdr, len);
*resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
&msg);
if ((iret.methodState == METHOD_DONE ||
iret.methodState == METHOD_MAY_CONT) &&
(iret.decision == DECISION_UNCOND_SUCC ||
iret.decision == DECISION_COND_SUCC ||
iret.decision == DECISION_FAIL)) {
ret->methodState = iret.methodState;
ret->decision = iret.decision;
}
eap_ttlsv1_phase2_eap_finish(sm, data, ret);
return 0;
}
static int eap_ttls_phase2_request_eap_method(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct eap_hdr *hdr, size_t len,
u8 method, struct wpabuf **resp)
{
#ifdef EAP_TNC
if (data->tnc_started && data->phase2_method &&
data->phase2_priv && method == EAP_TYPE_TNC &&
data->phase2_eap_type.method == EAP_TYPE_TNC)
return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len,
resp);
if (data->ready_for_tnc && !data->tnc_started &&
method == EAP_TYPE_TNC) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
"EAP method");
data->tnc_started = 1;
}
if (data->tnc_started) {
if (data->phase2_eap_type.vendor != EAP_VENDOR_IETF ||
data->phase2_eap_type.method == EAP_TYPE_TNC) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected EAP "
"type %d for TNC", method);
return -1;
}
data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
data->phase2_eap_type.method = method;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected "
"Phase 2 EAP vendor %d method %d (TNC)",
data->phase2_eap_type.vendor,
data->phase2_eap_type.method);
if (data->phase2_type == EAP_TTLS_PHASE2_EAP)
eap_ttls_phase2_eap_deinit(sm, data);
}
#endif /* EAP_TNC */
if (data->phase2_eap_type.vendor == EAP_VENDOR_IETF &&
data->phase2_eap_type.method == EAP_TYPE_NONE)
eap_ttls_phase2_select_eap_method(data, method);
if (method != data->phase2_eap_type.method || method == EAP_TYPE_NONE)
{
if (eap_peer_tls_phase2_nak(data->phase2_eap_types,
data->num_phase2_eap_types,
hdr, resp))
return -1;
return 0;
}
if (data->phase2_priv == NULL) {
data->phase2_method = eap_peer_get_eap_method(
EAP_VENDOR_IETF, method);
if (data->phase2_method) {
sm->init_phase2 = 1;
data->phase2_priv = data->phase2_method->init(sm);
sm->init_phase2 = 0;
}
}
if (data->phase2_priv == NULL || data->phase2_method == NULL) {
wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize "
"Phase 2 EAP method %d", method);
return -1;
}
return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len, resp);
}
static int eap_ttls_phase2_request_eap(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct eap_hdr *hdr,
struct wpabuf **resp)
{
size_t len = be_to_host16(hdr->length);
u8 *pos;
struct eap_peer_config *config = eap_get_config(sm);
if (len <= sizeof(struct eap_hdr)) {
wpa_printf(MSG_INFO, "EAP-TTLS: too short "
"Phase 2 request (len=%lu)", (unsigned long) len);
return -1;
}
pos = (u8 *) (hdr + 1);
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos);
switch (*pos) {
case EAP_TYPE_IDENTITY:
*resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
break;
default:
if (eap_ttls_phase2_request_eap_method(sm, data, ret, hdr, len,
*pos, resp) < 0)
return -1;
break;
}
if (*resp == NULL &&
(config->pending_req_identity || config->pending_req_password ||
config->pending_req_otp)) {
return 0;
}
if (*resp == NULL)
return -1;
wpa_hexdump_buf(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response",
*resp);
return eap_ttls_avp_encapsulate(resp, RADIUS_ATTR_EAP_MESSAGE, 1);
}
static void eap_ttlsv1_permute_inner(struct eap_sm *sm,
struct eap_ttls_data *data)
{
#if EAP_TTLS_VERSION > 0
u8 session_key[2 * MSCHAPV2_KEY_LEN];
if (data->ttls_version == 0)
return;
get_asymetric_start_key(data->master_key, session_key,
MSCHAPV2_KEY_LEN, 0, 0);
get_asymetric_start_key(data->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));
#endif /* EAP_TTLS_VERSION */
}
static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct wpabuf **resp)
{
struct wpabuf *msg;
u8 *buf, *pos, *challenge, *peer_challenge;
const u8 *identity, *password;
size_t identity_len, password_len;
int pwhash;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request");
identity = eap_get_config_identity(sm, &identity_len);
password = eap_get_config_password2(sm, &password_len, &pwhash);
if (identity == NULL || password == NULL)
return -1;
msg = wpabuf_alloc(identity_len + 1000);
if (msg == NULL) {
wpa_printf(MSG_ERROR,
"EAP-TTLS/MSCHAPV2: Failed to allocate memory");
return -1;
}
pos = buf = wpabuf_mhead(msg);
/* User-Name */
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
identity, identity_len);
/* MS-CHAP-Challenge */
challenge = eap_ttls_implicit_challenge(
sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1);
if (challenge == NULL) {
wpabuf_free(msg);
wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
"implicit challenge");
return -1;
}
peer_challenge = challenge + 1 + EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
RADIUS_VENDOR_ID_MICROSOFT, 1,
challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
/* MS-CHAP2-Response */
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE,
RADIUS_VENDOR_ID_MICROSOFT, 1,
EAP_TTLS_MSCHAPV2_RESPONSE_LEN);
data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN];
*pos++ = data->ident;
*pos++ = 0; /* Flags */
os_memcpy(pos, peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN;
os_memset(pos, 0, 8); /* Reserved, must be zero */
pos += 8;
if (mschapv2_derive_response(identity, identity_len, password,
password_len, pwhash, challenge,
peer_challenge, pos, data->auth_response,
data->master_key)) {
wpabuf_free(msg);
wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive "
"response");
return -1;
}
data->auth_response_valid = 1;
eap_ttlsv1_permute_inner(sm, data);
pos += 24;
os_free(challenge);
AVP_PAD(buf, pos);
wpabuf_put(msg, pos - buf);
*resp = msg;
if (sm->workaround && data->ttls_version == 0) {
/* At least FreeRADIUS seems to be terminating
* EAP-TTLS/MSHCAPV2 without the expected MS-CHAP-v2 Success
* packet. */
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: EAP workaround - "
"allow success without tunneled response");
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_COND_SUCC;
}
return 0;
}
static int eap_ttls_phase2_request_mschap(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct wpabuf **resp)
{
struct wpabuf *msg;
u8 *buf, *pos, *challenge;
const u8 *identity, *password;
size_t identity_len, password_len;
int pwhash;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request");
identity = eap_get_config_identity(sm, &identity_len);
password = eap_get_config_password2(sm, &password_len, &pwhash);
if (identity == NULL || password == NULL)
return -1;
msg = wpabuf_alloc(identity_len + 1000);
if (msg == NULL) {
wpa_printf(MSG_ERROR,
"EAP-TTLS/MSCHAP: Failed to allocate memory");
return -1;
}
pos = buf = wpabuf_mhead(msg);
/* User-Name */
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
identity, identity_len);
/* MS-CHAP-Challenge */
challenge = eap_ttls_implicit_challenge(
sm, data, EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1);
if (challenge == NULL) {
wpabuf_free(msg);
wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive "
"implicit challenge");
return -1;
}
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
RADIUS_VENDOR_ID_MICROSOFT, 1,
challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
/* MS-CHAP-Response */
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE,
RADIUS_VENDOR_ID_MICROSOFT, 1,
EAP_TTLS_MSCHAP_RESPONSE_LEN);
data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN];
*pos++ = data->ident;
*pos++ = 1; /* Flags: Use NT style passwords */
os_memset(pos, 0, 24); /* LM-Response */
pos += 24;
if (pwhash) {
challenge_response(challenge, password, pos); /* NT-Response */
wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password hash",
password, 16);
} else {
nt_challenge_response(challenge, password, password_len,
pos); /* NT-Response */
wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
password, password_len);
}
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge",
challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24);
pos += 24;
os_free(challenge);
AVP_PAD(buf, pos);
wpabuf_put(msg, pos - buf);
*resp = msg;
if (data->ttls_version > 0) {
/* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
* so do not allow connection to be terminated yet. */
ret->methodState = METHOD_CONT;
ret->decision = DECISION_COND_SUCC;
} else {
/* EAP-TTLS/MSCHAP does not provide tunneled success
* notification, so assume that Phase2 succeeds. */
ret->methodState = METHOD_DONE;
ret->decision = DECISION_COND_SUCC;
}
return 0;
}
static int eap_ttls_phase2_request_pap(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct wpabuf **resp)
{
struct wpabuf *msg;
u8 *buf, *pos;
size_t pad;
const u8 *identity, *password;
size_t identity_len, password_len;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request");
identity = eap_get_config_identity(sm, &identity_len);
password = eap_get_config_password(sm, &password_len);
if (identity == NULL || password == NULL)
return -1;
msg = wpabuf_alloc(identity_len + password_len + 100);
if (msg == NULL) {
wpa_printf(MSG_ERROR,
"EAP-TTLS/PAP: Failed to allocate memory");
return -1;
}
pos = buf = wpabuf_mhead(msg);
/* User-Name */
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
identity, identity_len);
/* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts
* the data, so no separate encryption is used in the AVP itself.
* However, the password is padded to obfuscate its length. */
pad = password_len == 0 ? 16 : (16 - (password_len & 15)) & 15;
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1,
password_len + pad);
os_memcpy(pos, password, password_len);
pos += password_len;
os_memset(pos, 0, pad);
pos += pad;
AVP_PAD(buf, pos);
wpabuf_put(msg, pos - buf);
*resp = msg;
if (data->ttls_version > 0) {
/* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
* so do not allow connection to be terminated yet. */
ret->methodState = METHOD_CONT;
ret->decision = DECISION_COND_SUCC;
} else {
/* EAP-TTLS/PAP does not provide tunneled success notification,
* so assume that Phase2 succeeds. */
ret->methodState = METHOD_DONE;
ret->decision = DECISION_COND_SUCC;
}
return 0;
}
static int eap_ttls_phase2_request_chap(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct wpabuf **resp)
{
struct wpabuf *msg;
u8 *buf, *pos, *challenge;
const u8 *identity, *password;
size_t identity_len, password_len;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");
identity = eap_get_config_identity(sm, &identity_len);
password = eap_get_config_password(sm, &password_len);
if (identity == NULL || password == NULL)
return -1;
msg = wpabuf_alloc(identity_len + 1000);
if (msg == NULL) {
wpa_printf(MSG_ERROR,
"EAP-TTLS/CHAP: Failed to allocate memory");
return -1;
}
pos = buf = wpabuf_mhead(msg);
/* User-Name */
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
identity, identity_len);
/* CHAP-Challenge */
challenge = eap_ttls_implicit_challenge(
sm, data, EAP_TTLS_CHAP_CHALLENGE_LEN + 1);
if (challenge == NULL) {
wpabuf_free(msg);
wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
"implicit challenge");
return -1;
}
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
/* CHAP-Password */
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
1 + EAP_TTLS_CHAP_PASSWORD_LEN);
data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
*pos++ = data->ident;
/* MD5(Ident + Password + Challenge) */
chap_md5(data->ident, password, password_len, challenge,
EAP_TTLS_CHAP_CHALLENGE_LEN, pos);
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
identity, identity_len);
wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
password, password_len);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
pos, EAP_TTLS_CHAP_PASSWORD_LEN);
pos += EAP_TTLS_CHAP_PASSWORD_LEN;
os_free(challenge);
AVP_PAD(buf, pos);
wpabuf_put(msg, pos - buf);
*resp = msg;
if (data->ttls_version > 0) {
/* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report success,
* so do not allow connection to be terminated yet. */
ret->methodState = METHOD_CONT;
ret->decision = DECISION_COND_SUCC;
} else {
/* EAP-TTLS/CHAP does not provide tunneled success
* notification, so assume that Phase2 succeeds. */
ret->methodState = METHOD_DONE;
ret->decision = DECISION_COND_SUCC;
}
return 0;
}
static int eap_ttls_phase2_request(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct eap_hdr *hdr,
struct wpabuf **resp)
{
int res = 0;
size_t len;
enum phase2_types phase2_type = data->phase2_type;
#ifdef EAP_TNC
if (data->tnc_started) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Processing TNC");
phase2_type = EAP_TTLS_PHASE2_EAP;
}
#endif /* EAP_TNC */
if (phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
phase2_type == EAP_TTLS_PHASE2_PAP ||
phase2_type == EAP_TTLS_PHASE2_CHAP) {
if (eap_get_config_identity(sm, &len) == NULL) {
wpa_printf(MSG_INFO,
"EAP-TTLS: Identity not configured");
eap_sm_request_identity(sm);
if (eap_get_config_password(sm, &len) == NULL)
eap_sm_request_password(sm);
return 0;
}
if (eap_get_config_password(sm, &len) == NULL) {
wpa_printf(MSG_INFO,
"EAP-TTLS: Password not configured");
eap_sm_request_password(sm);
return 0;
}
}
switch (phase2_type) {
case EAP_TTLS_PHASE2_EAP:
res = eap_ttls_phase2_request_eap(sm, data, ret, hdr, resp);
break;
case EAP_TTLS_PHASE2_MSCHAPV2:
res = eap_ttls_phase2_request_mschapv2(sm, data, ret, resp);
break;
case EAP_TTLS_PHASE2_MSCHAP:
res = eap_ttls_phase2_request_mschap(sm, data, ret, resp);
break;
case EAP_TTLS_PHASE2_PAP:
res = eap_ttls_phase2_request_pap(sm, data, ret, resp);
break;
case EAP_TTLS_PHASE2_CHAP:
res = eap_ttls_phase2_request_chap(sm, data, ret, resp);
break;
default:
wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown");
res = -1;
break;
}
if (res < 0) {
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
}
return res;
}
#if EAP_TTLS_VERSION > 0
static struct wpabuf * eap_ttls_build_phase_finished(
struct eap_sm *sm, struct eap_ttls_data *data, int id, int final)
{
struct wpabuf *req, *buf;
buf = tls_connection_ia_send_phase_finished(sm->ssl_ctx,
data->ssl.conn,
final);
if (buf == NULL)
return NULL;
req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TTLS,
1 + wpabuf_len(buf),
EAP_CODE_RESPONSE, id);
if (req == NULL) {
wpabuf_free(buf);
return NULL;
}
wpabuf_put_u8(req, data->ttls_version);
wpabuf_put_buf(req, buf);
wpabuf_free(buf);
eap_update_len(req);
return req;
}
#endif /* EAP_TTLS_VERSION */
struct ttls_parse_avp {
u8 *mschapv2;
u8 *eapdata;
size_t eap_len;
int mschapv2_error;
};
static int eap_ttls_parse_attr_eap(const u8 *dpos, size_t dlen,
struct ttls_parse_avp *parse)
{
wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message");
if (parse->eapdata == NULL) {
parse->eapdata = os_malloc(dlen);
if (parse->eapdata == NULL) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
"memory for Phase 2 EAP data");
return -1;
}
os_memcpy(parse->eapdata, dpos, dlen);
parse->eap_len = dlen;
} else {
u8 *neweap = os_realloc(parse->eapdata, parse->eap_len + dlen);
if (neweap == NULL) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate "
"memory for Phase 2 EAP data");
return -1;
}
os_memcpy(neweap + parse->eap_len, dpos, dlen);
parse->eapdata = neweap;
parse->eap_len += dlen;
}
return 0;
}
static int eap_ttls_parse_avp(u8 *pos, size_t left,
struct ttls_parse_avp *parse)
{
struct ttls_avp *avp;
u32 avp_code, avp_length, vendor_id = 0;
u8 avp_flags, *dpos;
size_t dlen;
avp = (struct ttls_avp *) pos;
avp_code = be_to_host32(avp->avp_code);
avp_length = be_to_host32(avp->avp_length);
avp_flags = (avp_length >> 24) & 0xff;
avp_length &= 0xffffff;
wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x "
"length=%d", (int) avp_code, avp_flags,
(int) avp_length);
if (avp_length > left) {
wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow "
"(len=%d, left=%lu) - dropped",
(int) avp_length, (unsigned long) left);
return -1;
}
if (avp_length < sizeof(*avp)) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length %d",
avp_length);
return -1;
}
dpos = (u8 *) (avp + 1);
dlen = avp_length - sizeof(*avp);
if (avp_flags & AVP_FLAGS_VENDOR) {
if (dlen < 4) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Vendor AVP "
"underflow");
return -1;
}
vendor_id = WPA_GET_BE32(dpos);
wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d",
(int) vendor_id);
dpos += 4;
dlen -= 4;
}
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen);
if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) {
if (eap_ttls_parse_attr_eap(dpos, dlen, parse) < 0)
return -1;
} else if (vendor_id == 0 && avp_code == RADIUS_ATTR_REPLY_MESSAGE) {
/* This is an optional message that can be displayed to
* the user. */
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: AVP - Reply-Message",
dpos, dlen);
} else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) {
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP2-Success",
dpos, dlen);
if (dlen != 43) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected "
"MS-CHAP2-Success length "
"(len=%lu, expected 43)",
(unsigned long) dlen);
return -1;
}
parse->mschapv2 = dpos;
} else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT &&
avp_code == RADIUS_ATTR_MS_CHAP_ERROR) {
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP-Error",
dpos, dlen);
parse->mschapv2_error = 1;
} else if (avp_flags & AVP_FLAGS_MANDATORY) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported mandatory AVP "
"code %d vendor_id %d - dropped",
(int) avp_code, (int) vendor_id);
return -1;
} else {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported AVP "
"code %d vendor_id %d",
(int) avp_code, (int) vendor_id);
}
return avp_length;
}
static int eap_ttls_parse_avps(struct wpabuf *in_decrypted,
struct ttls_parse_avp *parse)
{
u8 *pos;
size_t left, pad;
int avp_length;
pos = wpabuf_mhead(in_decrypted);
left = wpabuf_len(in_decrypted);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs", pos, left);
if (left < sizeof(struct ttls_avp)) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame"
" len=%lu expected %lu or more - dropped",
(unsigned long) left,
(unsigned long) sizeof(struct ttls_avp));
return -1;
}
/* Parse AVPs */
os_memset(parse, 0, sizeof(*parse));
while (left > 0) {
avp_length = eap_ttls_parse_avp(pos, left, parse);
if (avp_length < 0)
return -1;
pad = (4 - (avp_length & 3)) & 3;
pos += avp_length + pad;
if (left < avp_length + pad)
left = 0;
else
left -= avp_length + pad;
}
return 0;
}
static u8 * eap_ttls_fake_identity_request(void)
{
struct eap_hdr *hdr;
u8 *buf;
wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of "
"Phase 2 - use fake EAP-Request Identity");
buf = os_malloc(sizeof(*hdr) + 1);
if (buf == NULL) {
wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate "
"memory for fake EAP-Identity Request");
return NULL;
}
hdr = (struct eap_hdr *) buf;
hdr->code = EAP_CODE_REQUEST;
hdr->identifier = 0;
hdr->length = host_to_be16(sizeof(*hdr) + 1);
buf[sizeof(*hdr)] = EAP_TYPE_IDENTITY;
return buf;
}
static int eap_ttls_encrypt_response(struct eap_sm *sm,
struct eap_ttls_data *data,
struct wpabuf *resp, u8 identifier,
struct wpabuf **out_data)
{
if (resp == NULL)
return 0;
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data",
resp);
if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
data->ttls_version, identifier,
resp, out_data)) {
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt a Phase 2 "
"frame");
return -1;
}
wpabuf_free(resp);
return 0;
}
static int eap_ttls_process_phase2_eap(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct ttls_parse_avp *parse,
struct wpabuf **resp)
{
struct eap_hdr *hdr;
size_t len;
if (parse->eapdata == NULL) {
wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in the "
"packet - dropped");
return -1;
}
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP",
parse->eapdata, parse->eap_len);
hdr = (struct eap_hdr *) parse->eapdata;
if (parse->eap_len < sizeof(*hdr)) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 EAP "
"frame (len=%lu, expected %lu or more) - dropped",
(unsigned long) parse->eap_len,
(unsigned long) sizeof(*hdr));
return -1;
}
len = be_to_host16(hdr->length);
if (len > parse->eap_len) {
wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in Phase 2 "
"EAP frame (EAP hdr len=%lu, EAP data len in "
"AVP=%lu)",
(unsigned long) len,
(unsigned long) parse->eap_len);
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d "
"identifier=%d length=%lu",
hdr->code, hdr->identifier, (unsigned long) len);
switch (hdr->code) {
case EAP_CODE_REQUEST:
if (eap_ttls_phase2_request(sm, data, ret, hdr, resp)) {
wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
"processing failed");
return -1;
}
break;
default:
wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in "
"Phase 2 EAP header", hdr->code);
return -1;
}
return 0;
}
static int eap_ttls_process_phase2_mschapv2(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct ttls_parse_avp *parse)
{
if (parse->mschapv2_error) {
wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received "
"MS-CHAP-Error - failed");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
/* Reply with empty data to ACK error */
return 1;
}
if (parse->mschapv2 == NULL) {
#ifdef EAP_TNC
if (data->phase2_success && parse->eapdata) {
/*
* Allow EAP-TNC to be started after successfully
* completed MSCHAPV2.
*/
return 1;
}
#endif /* EAP_TNC */
wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success AVP "
"received for Phase2 MSCHAPV2");
return -1;
}
if (parse->mschapv2[0] != data->ident) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch for Phase 2 "
"MSCHAPV2 (received Ident 0x%02x, expected 0x%02x)",
parse->mschapv2[0], data->ident);
return -1;
}
if (!data->auth_response_valid ||
mschapv2_verify_auth_response(data->auth_response,
parse->mschapv2 + 1, 42)) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid authenticator "
"response in Phase 2 MSCHAPV2 success request");
return -1;
}
wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 "
"authentication succeeded");
if (data->ttls_version > 0) {
/*
* EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report
* success, so do not allow connection to be terminated
* yet.
*/
ret->methodState = METHOD_CONT;
ret->decision = DECISION_COND_SUCC;
} else {
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
data->phase2_success = 1;
}
/*
* Reply with empty data; authentication server will reply
* with EAP-Success after this.
*/
return 1;
}
#ifdef EAP_TNC
static int eap_ttls_process_tnc_start(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
struct ttls_parse_avp *parse,
struct wpabuf **resp)
{
/* TNC uses inner EAP method after non-EAP TTLS phase 2. */
if (parse->eapdata == NULL) {
wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
"unexpected tunneled data (no EAP)");
return -1;
}
if (!data->ready_for_tnc) {
wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received "
"EAP after non-EAP, but not ready for TNC");
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed "
"non-EAP method");
data->tnc_started = 1;
if (eap_ttls_process_phase2_eap(sm, data, ret, parse, resp) < 0)
return -1;
return 0;
}
#endif /* EAP_TNC */
static int eap_ttls_process_decrypted(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
u8 identifier,
struct ttls_parse_avp *parse,
struct wpabuf *in_decrypted,
struct wpabuf **out_data)
{
struct wpabuf *resp = NULL;
struct eap_peer_config *config = eap_get_config(sm);
int res;
enum phase2_types phase2_type = data->phase2_type;
#ifdef EAP_TNC
if (data->tnc_started)
phase2_type = EAP_TTLS_PHASE2_EAP;
#endif /* EAP_TNC */
switch (phase2_type) {
case EAP_TTLS_PHASE2_EAP:
if (eap_ttls_process_phase2_eap(sm, data, ret, parse, &resp) <
0)
return -1;
break;
case EAP_TTLS_PHASE2_MSCHAPV2:
res = eap_ttls_process_phase2_mschapv2(sm, data, ret, parse);
#ifdef EAP_TNC
if (res == 1 && parse->eapdata && data->phase2_success) {
/*
* TNC may be required as the next
* authentication method within the tunnel.
*/
ret->methodState = METHOD_MAY_CONT;
data->ready_for_tnc = 1;
if (eap_ttls_process_tnc_start(sm, data, ret, parse,
&resp) == 0)
break;
}
#endif /* EAP_TNC */
return res;
case EAP_TTLS_PHASE2_MSCHAP:
case EAP_TTLS_PHASE2_PAP:
case EAP_TTLS_PHASE2_CHAP:
#ifdef EAP_TNC
if (eap_ttls_process_tnc_start(sm, data, ret, parse, &resp) <
0)
return -1;
break;
#else /* EAP_TNC */
/* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled
* requests to the supplicant */
wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected "
"tunneled data");
return -1;
#endif /* EAP_TNC */
}
if (resp) {
if (eap_ttls_encrypt_response(sm, data, resp, identifier,
out_data) < 0)
return -1;
} else if (config->pending_req_identity ||
config->pending_req_password ||
config->pending_req_otp ||
config->pending_req_new_password) {
wpabuf_free(data->pending_phase2_req);
data->pending_phase2_req = wpabuf_dup(in_decrypted);
}
return 0;
}
#if EAP_TTLS_VERSION > 0
static void eap_ttls_final_phase_finished(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
u8 identifier,
struct wpabuf **out_data)
{
wpa_printf(MSG_DEBUG, "EAP-TTLS: FinalPhaseFinished received");
wpa_printf(MSG_INFO, "EAP-TTLS: TLS/IA authentication succeeded");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
data->phase2_success = 1;
*out_data = eap_ttls_build_phase_finished(sm, data, identifier, 1);
eap_ttls_v1_derive_key(sm, data);
}
#endif /* EAP_TTLS_VERSION */
static int eap_ttls_implicit_identity_request(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
u8 identifier,
struct wpabuf **out_data)
{
int retval = 0;
struct eap_hdr *hdr;
struct wpabuf *resp;
hdr = (struct eap_hdr *) eap_ttls_fake_identity_request();
if (hdr == NULL) {
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
return -1;
}
resp = NULL;
if (eap_ttls_phase2_request(sm, data, ret, hdr, &resp)) {
wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request "
"processing failed");
retval = -1;
} else {
retval = eap_ttls_encrypt_response(sm, data, resp, identifier,
out_data);
}
os_free(hdr);
if (retval < 0) {
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
}
return retval;
}
static int eap_ttls_phase2_start(struct eap_sm *sm, struct eap_ttls_data *data,
struct eap_method_ret *ret, u8 identifier,
struct wpabuf **out_data)
{
data->phase2_start = 0;
/*
* EAP-TTLS does not use Phase2 on fast re-auth; this must be done only
* if TLS part was indeed resuming a previous session. Most
* Authentication Servers terminate EAP-TTLS before reaching this
* point, but some do not. Make wpa_supplicant stop phase 2 here, if
* needed.
*/
if (data->reauth &&
tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - "
"skip phase 2");
*out_data = eap_peer_tls_build_ack(identifier, EAP_TYPE_TTLS,
data->ttls_version);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_UNCOND_SUCC;
data->phase2_success = 1;
return 0;
}
return eap_ttls_implicit_identity_request(sm, data, ret, identifier,
out_data);
}
static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data,
struct eap_method_ret *ret, u8 identifier,
const struct wpabuf *in_data,
struct wpabuf **out_data)
{
struct wpabuf *in_decrypted = NULL;
int retval = 0;
struct ttls_parse_avp parse;
os_memset(&parse, 0, sizeof(parse));
wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for"
" Phase 2",
in_data ? (unsigned long) wpabuf_len(in_data) : 0);
if (data->pending_phase2_req) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - "
"skip decryption and use old data");
/* Clear TLS reassembly state. */
eap_peer_tls_reset_input(&data->ssl);
in_decrypted = data->pending_phase2_req;
data->pending_phase2_req = NULL;
if (wpabuf_len(in_decrypted) == 0) {
wpabuf_free(in_decrypted);
return eap_ttls_implicit_identity_request(
sm, data, ret, identifier, out_data);
}
goto continue_req;
}
if ((in_data == NULL || wpabuf_len(in_data) == 0) &&
data->phase2_start) {
return eap_ttls_phase2_start(sm, data, ret, identifier,
out_data);
}
if (in_data == NULL || wpabuf_len(in_data) == 0) {
/* Received TLS ACK - requesting more fragments */
return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS,
data->ttls_version,
identifier, NULL, out_data);
}
retval = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
if (retval)
goto done;
#if EAP_TTLS_VERSION > 0
if (data->ttls_version > 0 &&
(in_decrypted == NULL || wpabuf_len(in_decrypted) == 0) &&
tls_connection_ia_final_phase_finished(sm->ssl_ctx,
data->ssl.conn)) {
eap_ttls_final_phase_finished(sm, data, ret, identifier,
out_data);
goto done;
}
#endif /* EAP_TTLS_VERSION */
continue_req:
data->phase2_start = 0;
if (eap_ttls_parse_avps(in_decrypted, &parse) < 0) {
retval = -1;
goto done;
}
retval = eap_ttls_process_decrypted(sm, data, ret, identifier,
&parse, in_decrypted, out_data);
done:
wpabuf_free(in_decrypted);
os_free(parse.eapdata);
if (retval < 0) {
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
}
return retval;
}
static int eap_ttls_process_start(struct eap_sm *sm,
struct eap_ttls_data *data, u8 flags,
struct eap_method_ret *ret)
{
struct eap_peer_config *config = eap_get_config(sm);
wpa_printf(MSG_DEBUG, "EAP-TTLS: Start (server ver=%d, own ver=%d)",
flags & EAP_TLS_VERSION_MASK, data->ttls_version);
#if EAP_TTLS_VERSION > 0
if ((flags & EAP_TLS_VERSION_MASK) < data->ttls_version)
data->ttls_version = flags & EAP_TLS_VERSION_MASK;
if (data->force_ttls_version >= 0 &&
data->force_ttls_version != data->ttls_version) {
wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to select "
"forced TTLS version %d",
data->force_ttls_version);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
ret->allowNotifications = FALSE;
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-TTLS: Using TTLS version %d",
data->ttls_version);
if (data->ttls_version > 0)
data->ssl.tls_ia = 1;
#endif /* EAP_TTLS_VERSION */
if (!data->ssl_initialized &&
eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL.");
return -1;
}
data->ssl_initialized = 1;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Start");
return 0;
}
static int eap_ttls_process_handshake(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
u8 identifier,
const u8 *in_data, size_t in_len,
struct wpabuf **out_data)
{
int res;
res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS,
data->ttls_version, identifier,
in_data, in_len, out_data);
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS done, proceed to "
"Phase 2");
if (data->resuming) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth - may "
"skip Phase 2");
ret->decision = DECISION_COND_SUCC;
ret->methodState = METHOD_MAY_CONT;
}
data->phase2_start = 1;
if (data->ttls_version == 0)
eap_ttls_v0_derive_key(sm, data);
if (*out_data == NULL || wpabuf_len(*out_data) == 0) {
if (eap_ttls_decrypt(sm, data, ret, identifier,
NULL, out_data)) {
wpa_printf(MSG_WARNING, "EAP-TTLS: "
"failed to process early "
"start for Phase 2");
}
res = 0;
}
data->resuming = 0;
}
if (res == 2) {
struct wpabuf msg;
/*
* Application data included in the handshake message.
*/
wpabuf_free(data->pending_phase2_req);
data->pending_phase2_req = *out_data;
*out_data = NULL;
wpabuf_set(&msg, in_data, in_len);
res = eap_ttls_decrypt(sm, data, ret, identifier, &msg,
out_data);
}
return res;
}
static void eap_ttls_check_auth_status(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret)
{
if (data->ttls_version == 0 && ret->methodState == METHOD_DONE) {
ret->allowNotifications = FALSE;
if (ret->decision == DECISION_UNCOND_SUCC ||
ret->decision == DECISION_COND_SUCC) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
"completed successfully");
data->phase2_success = 1;
#ifdef EAP_TNC
if (!data->ready_for_tnc && !data->tnc_started) {
/*
* TNC may be required as the next
* authentication method within the tunnel.
*/
ret->methodState = METHOD_MAY_CONT;
data->ready_for_tnc = 1;
}
#endif /* EAP_TNC */
}
} else if (data->ttls_version == 0 &&
ret->methodState == METHOD_MAY_CONT &&
(ret->decision == DECISION_UNCOND_SUCC ||
ret->decision == DECISION_COND_SUCC)) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication "
"completed successfully (MAY_CONT)");
data->phase2_success = 1;
}
}
static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const struct wpabuf *reqData)
{
size_t left;
int res;
u8 flags, id;
struct wpabuf *resp;
const u8 *pos;
struct eap_ttls_data *data = priv;
pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret,
reqData, &left, &flags);
if (pos == NULL)
return NULL;
id = eap_get_id(reqData);
if (flags & EAP_TLS_FLAGS_START) {
if (eap_ttls_process_start(sm, data, flags, ret) < 0)
return NULL;
/* RFC 5281, Ch. 9.2:
* "This packet MAY contain additional information in the form
* of AVPs, which may provide useful hints to the client"
* For now, ignore any potential extra data.
*/
left = 0;
} else if (!data->ssl_initialized) {
wpa_printf(MSG_DEBUG, "EAP-TTLS: First message did not "
"include Start flag");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
ret->allowNotifications = FALSE;
return NULL;
}
resp = NULL;
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
!data->resuming) {
struct wpabuf msg;
wpabuf_set(&msg, pos, left);
res = eap_ttls_decrypt(sm, data, ret, id, &msg, &resp);
} else {
res = eap_ttls_process_handshake(sm, data, ret, id,
pos, left, &resp);
}
eap_ttls_check_auth_status(sm, data, ret);
/* FIX: what about res == -1? Could just move all error processing into
* the other functions and get rid of this res==1 case here. */
if (res == 1) {
wpabuf_free(resp);
return eap_peer_tls_build_ack(id, EAP_TYPE_TTLS,
data->ttls_version);
}
return resp;
}
static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv)
{
struct eap_ttls_data *data = priv;
return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
data->phase2_success;
}
static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_ttls_data *data = priv;
wpabuf_free(data->pending_phase2_req);
data->pending_phase2_req = NULL;
#ifdef EAP_TNC
data->ready_for_tnc = 0;
data->tnc_started = 0;
#endif /* EAP_TNC */
}
static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_ttls_data *data = priv;
os_free(data->key_data);
data->key_data = NULL;
if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
os_free(data);
return NULL;
}
if (data->phase2_priv && data->phase2_method &&
data->phase2_method->init_for_reauth)
data->phase2_method->init_for_reauth(sm, data->phase2_priv);
data->phase2_start = 0;
data->phase2_success = 0;
data->resuming = 1;
data->reauth = 1;
return priv;
}
static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf,
size_t buflen, int verbose)
{
struct eap_ttls_data *data = priv;
int len, ret;
len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
ret = os_snprintf(buf + len, buflen - len,
"EAP-TTLSv%d Phase2 method=",
data->ttls_version);
if (ret < 0 || (size_t) ret >= buflen - len)
return len;
len += ret;
switch (data->phase2_type) {
case EAP_TTLS_PHASE2_EAP:
ret = os_snprintf(buf + len, buflen - len, "EAP-%s\n",
data->phase2_method ?
data->phase2_method->name : "?");
break;
case EAP_TTLS_PHASE2_MSCHAPV2:
ret = os_snprintf(buf + len, buflen - len, "MSCHAPV2\n");
break;
case EAP_TTLS_PHASE2_MSCHAP:
ret = os_snprintf(buf + len, buflen - len, "MSCHAP\n");
break;
case EAP_TTLS_PHASE2_PAP:
ret = os_snprintf(buf + len, buflen - len, "PAP\n");
break;
case EAP_TTLS_PHASE2_CHAP:
ret = os_snprintf(buf + len, buflen - len, "CHAP\n");
break;
default:
ret = 0;
break;
}
if (ret < 0 || (size_t) ret >= buflen - len)
return len;
len += ret;
return len;
}
static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv)
{
struct eap_ttls_data *data = priv;
return data->key_data != NULL && data->phase2_success;
}
static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_ttls_data *data = priv;
u8 *key;
if (data->key_data == NULL || !data->phase2_success)
return NULL;
key = os_malloc(EAP_TLS_KEY_LEN);
if (key == NULL)
return NULL;
*len = EAP_TLS_KEY_LEN;
os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
return key;
}
int eap_peer_ttls_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS");
if (eap == NULL)
return -1;
eap->init = eap_ttls_init;
eap->deinit = eap_ttls_deinit;
eap->process = eap_ttls_process;
eap->isKeyAvailable = eap_ttls_isKeyAvailable;
eap->getKey = eap_ttls_getKey;
eap->get_status = eap_ttls_get_status;
eap->has_reauth_data = eap_ttls_has_reauth_data;
eap->deinit_for_reauth = eap_ttls_deinit_for_reauth;
eap->init_for_reauth = eap_ttls_init_for_reauth;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}
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