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eap_ttls.c
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/*
* EAP peer method: EAP-TTLS (draft-ietf-pppext-eap-ttls-03.txt)
* Copyright (c) 2004-2006, Jouni Malinen <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include "common.h"
#include "eap_i.h"
#include "eap_tls_common.h"
#include "config_ssid.h"
#include "ms_funcs.h"
#include "sha1.h"
#include "crypto.h"
#include "tls.h"
#include "eap_ttls.h"
/* Maximum supported PEAP version
* 0 = draft-ietf-pppext-eap-ttls-03.txt / draft-funk-eap-ttls-v0-00.txt
* 1 = draft-funk-eap-ttls-v1-00.txt
*/
#define EAP_TTLS_VERSION 0 /* TTLSv1 implementation is not yet complete */
#define MSCHAPV2_KEY_LEN 16
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 {
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[20];
int auth_response_valid;
u8 ident;
int resuming; /* starting a resumed session */
int reauth; /* reauthentication */
u8 *key_data;
u8 *pending_phase2_req;
size_t pending_phase2_req_len;
};
static void * eap_ttls_init(struct eap_sm *sm)
{
struct eap_ttls_data *data;
struct wpa_ssid *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 (config && config->phase1) {
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);
}
}
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 (config && config->phase2) {
char *start, *pos, *buf;
struct eap_method_type *methods = NULL, *_methods;
u8 method;
size_t num_methods = 0;
start = buf = os_strdup(config->phase2);
if (buf == NULL) {
eap_ttls_deinit(sm, data);
return NULL;
}
while (start && *start != '\0') {
int vendor;
pos = os_strstr(start, "autheap=");
if (pos == NULL)
break;
if (start != pos && *(pos - 1) != ' ') {
start = pos + 8;
continue;
}
start = pos + 8;
pos = os_strchr(start, ' ');
if (pos)
*pos++ = '\0';
method = eap_get_phase2_type(start, &vendor);
if (vendor == EAP_VENDOR_IETF &&
method == EAP_TYPE_NONE) {
wpa_printf(MSG_ERROR, "EAP-TTLS: "
"Unsupported Phase2 EAP "
"method '%s'", start);
} else {
num_methods++;
_methods = os_realloc(
methods, num_methods *
sizeof(*methods));
if (_methods == NULL) {
os_free(methods);
os_free(buf);
eap_ttls_deinit(sm, data);
return NULL;
}
methods = _methods;
methods[num_methods - 1].vendor =
vendor;
methods[num_methods - 1].method =
method;
}
start = pos;
}
os_free(buf);
data->phase2_eap_types = methods;
data->num_phase2_eap_types = num_methods;
}
if (data->phase2_eap_types == NULL) {
data->phase2_eap_types = eap_get_phase2_types(
config, &data->num_phase2_eap_types);
}
if (data->phase2_eap_types == NULL) {
wpa_printf(MSG_ERROR, "EAP-TTLS: No Phase2 EAP method "
"available");
eap_ttls_deinit(sm, data);
return NULL;
}
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase2 EAP types",
(u8 *) data->phase2_eap_types,
data->num_phase2_eap_types *
sizeof(struct eap_method_type));
data->phase2_eap_type.vendor = EAP_VENDOR_IETF;
data->phase2_eap_type.method = EAP_TYPE_NONE;
}
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;
}
return data;
}
static void eap_ttls_deinit(struct eap_sm *sm, void *priv)
{
struct eap_ttls_data *data = priv;
if (data == NULL)
return;
if (data->phase2_priv && data->phase2_method)
data->phase2_method->deinit(sm, data->phase2_priv);
os_free(data->phase2_eap_types);
if (data->ssl_initialized)
eap_tls_ssl_deinit(sm, &data->ssl);
os_free(data->key_data);
os_free(data->pending_phase2_req);
os_free(data);
}
static int eap_ttls_encrypt(struct eap_sm *sm, struct eap_ttls_data *data,
int id, const u8 *plain, size_t plain_len,
u8 **out_data, size_t *out_len)
{
int res;
u8 *pos;
struct eap_hdr *resp;
/* TODO: add support for fragmentation, if needed. This will need to
* add TLS Message Length field, if the frame is fragmented. */
resp = os_malloc(sizeof(struct eap_hdr) + 2 + data->ssl.tls_out_limit);
if (resp == NULL)
return -1;
resp->code = EAP_CODE_RESPONSE;
resp->identifier = id;
pos = (u8 *) (resp + 1);
*pos++ = EAP_TYPE_TTLS;
*pos++ = data->ttls_version;
res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
plain, plain_len,
pos, data->ssl.tls_out_limit);
if (res < 0) {
wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt Phase 2 "
"data");
os_free(resp);
return -1;
}
*out_len = sizeof(struct eap_hdr) + 2 + res;
resp->length = host_to_be16(*out_len);
*out_data = (u8 *) resp;
return 0;
}
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,
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(u8 **resp, size_t *resp_len, u32 avp_code,
int mandatory)
{
u8 *avp, *pos;
avp = os_malloc(sizeof(struct ttls_avp) + *resp_len + 4);
if (avp == NULL) {
os_free(*resp);
*resp = NULL;
*resp_len = 0;
return -1;
}
pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, *resp_len);
os_memcpy(pos, *resp, *resp_len);
pos += *resp_len;
AVP_PAD(avp, pos);
os_free(*resp);
*resp = avp;
*resp_len = pos - avp;
return 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;
}
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_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;
}
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;
}
static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm,
struct eap_ttls_data *data, size_t len)
{
struct tls_keys keys;
u8 *challenge, *rnd;
if (data->ttls_version == 0) {
return eap_tls_derive_key(sm, &data->ssl, "ttls challenge",
len);
}
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;
}
static int eap_ttls_phase2_nak(struct eap_ttls_data *data, struct eap_hdr *hdr,
u8 **resp, size_t *resp_len)
{
struct eap_hdr *resp_hdr;
u8 *pos = (u8 *) (hdr + 1);
size_t i;
/* TODO: add support for expanded Nak */
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 Request: Nak type=%d", *pos);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Allowed Phase2 EAP types",
(u8 *) data->phase2_eap_types, data->num_phase2_eap_types *
sizeof(struct eap_method_type));
*resp_len = sizeof(struct eap_hdr) + 1;
*resp = os_malloc(*resp_len + data->num_phase2_eap_types);
if (*resp == NULL)
return -1;
resp_hdr = (struct eap_hdr *) (*resp);
resp_hdr->code = EAP_CODE_RESPONSE;
resp_hdr->identifier = hdr->identifier;
pos = (u8 *) (resp_hdr + 1);
*pos++ = EAP_TYPE_NAK;
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 < 256) {
(*resp_len)++;
*pos++ = data->phase2_eap_types[i].method;
}
}
resp_hdr->length = host_to_be16(*resp_len);
return 0;
}
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,
u8 **resp, size_t *resp_len)
{
size_t len = be_to_host16(hdr->length);
u8 *pos;
struct eap_method_ret iret;
struct wpa_ssid *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, resp_len, 1);
break;
default:
if (data->phase2_eap_type.vendor == EAP_VENDOR_IETF &&
data->phase2_eap_type.method == EAP_TYPE_NONE) {
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 != *pos)
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;
}
}
if (*pos != data->phase2_eap_type.method ||
*pos == EAP_TYPE_NONE) {
if (eap_ttls_phase2_nak(data, hdr, resp, resp_len))
return -1;
break;
}
if (data->phase2_priv == NULL) {
data->phase2_method = eap_sm_get_eap_methods(
EAP_VENDOR_IETF, *pos);
if (data->phase2_method) {
sm->init_phase2 = 1;
sm->mschapv2_full_key = 1;
data->phase2_priv =
data->phase2_method->init(sm);
sm->init_phase2 = 0;
sm->mschapv2_full_key = 0;
}
}
if (data->phase2_priv == NULL || data->phase2_method == NULL) {
wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize "
"Phase 2 EAP method %d", *pos);
return -1;
}
os_memset(&iret, 0, sizeof(iret));
*resp = data->phase2_method->process(sm, data->phase2_priv,
&iret, (u8 *) hdr, len,
resp_len);
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;
}
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);
}
}
}
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(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response",
*resp, *resp_len);
return eap_ttls_avp_encapsulate(resp, resp_len,
RADIUS_ATTR_EAP_MESSAGE, 1);
}
static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm,
struct eap_ttls_data *data,
struct eap_method_ret *ret,
u8 **resp, size_t *resp_len)
{
struct wpa_ssid *config = eap_get_config(sm);
u8 *buf, *pos, *challenge, *username, *peer_challenge;
size_t username_len, i;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request");
/* MSCHAPv2 does not include optional domain name in the
* challenge-response calculation, so remove domain prefix
* (if present). */
username = config->identity;
username_len = config->identity_len;
pos = username;
for (i = 0; i < username_len; i++) {
if (username[i] == '\\') {
username_len -= i + 1;
username += i + 1;
break;
}
}
pos = buf = os_malloc(config->identity_len + 1000);
if (buf == NULL) {
wpa_printf(MSG_ERROR,
"EAP-TTLS/MSCHAPV2: Failed to allocate memory");
return -1;
}
/* User-Name */
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
config->identity, config->identity_len);
/* MS-CHAP-Challenge */
challenge = eap_ttls_implicit_challenge(
sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1);
if (challenge == NULL) {
os_free(buf);
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;
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: implicit auth_challenge",
challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2: peer_challenge",
peer_challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN);
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 username",
username, username_len);
wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 password",
config->password, config->password_len);
generate_nt_response(challenge, peer_challenge,
username, username_len,
config->password, config->password_len,
pos);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAPV2 response", pos, 24);
generate_authenticator_response(config->password, config->password_len,
peer_challenge, challenge,
username, username_len,
pos, data->auth_response);
data->auth_response_valid = 1;
if (data->ttls_version > 0) {
u8 pw_hash[16], pw_hash_hash[16], master_key[16];
u8 session_key[2 * MSCHAPV2_KEY_LEN];
nt_password_hash(config->password, config->password_len,
pw_hash);
hash_nt_password_hash(pw_hash, pw_hash_hash);
get_master_key(pw_hash_hash, pos /* 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));
}
pos += 24;
os_free(challenge);
AVP_PAD(buf, pos);
*resp = buf;
*resp_len = pos - buf;
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,
u8 **resp, size_t *resp_len)
{
struct wpa_ssid *config = eap_get_config(sm);
u8 *buf, *pos, *challenge;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request");
pos = buf = os_malloc(config->identity_len + 1000);
if (buf == NULL) {
wpa_printf(MSG_ERROR,
"EAP-TTLS/MSCHAP: Failed to allocate memory");
return -1;
}
/* User-Name */
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
config->identity, config->identity_len);
/* MS-CHAP-Challenge */
challenge = eap_ttls_implicit_challenge(
sm, data, EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1);
if (challenge == NULL) {
os_free(buf);
wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive "
"implicit challenge");
return -1;
}
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE,
RADIUS_VENDOR_ID_MICROSOFT, 1,
challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
/* MS-CHAP-Response */
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE,
RADIUS_VENDOR_ID_MICROSOFT, 1,
EAP_TTLS_MSCHAP_RESPONSE_LEN);
data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN];
*pos++ = data->ident;
*pos++ = 1; /* Flags: Use NT style passwords */
os_memset(pos, 0, 24); /* LM-Response */
pos += 24;
nt_challenge_response(challenge,
config->password, config->password_len,
pos); /* NT-Response */
wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password",
config->password, config->password_len);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge",
challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24);
pos += 24;
os_free(challenge);
AVP_PAD(buf, pos);
*resp = buf;
*resp_len = pos - buf;
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,
u8 **resp, size_t *resp_len)
{
struct wpa_ssid *config = eap_get_config(sm);
u8 *buf, *pos;
size_t pad;
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request");
pos = buf = os_malloc(config->identity_len + config->password_len +
100);
if (buf == NULL) {
wpa_printf(MSG_ERROR,
"EAP-TTLS/PAP: Failed to allocate memory");
return -1;
}
/* User-Name */
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
config->identity, config->identity_len);
/* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts
* the data, so no separate encryption is used in the AVP itself.
* However, the password is padded to obfuscate its length. */
pad = (16 - (config->password_len & 15)) & 15;
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1,
config->password_len + pad);
os_memcpy(pos, config->password, config->password_len);
pos += config->password_len;
os_memset(pos, 0, pad);
pos += pad;
AVP_PAD(buf, pos);
*resp = buf;
*resp_len = pos - buf;
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,
u8 **resp, size_t *resp_len)
{
struct wpa_ssid *config = eap_get_config(sm);
u8 *buf, *pos, *challenge;
const u8 *addr[3];
size_t len[3];
wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request");
pos = buf = os_malloc(config->identity_len + 1000);
if (buf == NULL) {
wpa_printf(MSG_ERROR,
"EAP-TTLS/CHAP: Failed to allocate memory");
return -1;
}
/* User-Name */
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1,
config->identity, config->identity_len);
/* CHAP-Challenge */
challenge = eap_ttls_implicit_challenge(
sm, data, EAP_TTLS_CHAP_CHALLENGE_LEN + 1);
if (challenge == NULL) {
os_free(buf);
wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive "
"implicit challenge");
return -1;
}
pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1,
challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
/* CHAP-Password */
pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1,
1 + EAP_TTLS_CHAP_PASSWORD_LEN);
data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN];
*pos++ = data->ident;
/* MD5(Ident + Password + Challenge) */
addr[0] = &data->ident;
len[0] = 1;
addr[1] = config->password;
len[1] = config->password_len;
addr[2] = challenge;
len[2] = EAP_TTLS_CHAP_CHALLENGE_LEN;
md5_vector(3, addr, len, pos);
wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username",
config->identity, config->identity_len);
wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password",
config->password, config->password_len);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge",
challenge, EAP_TTLS_CHAP_CHALLENGE_LEN);
wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password",
pos, EAP_TTLS_CHAP_PASSWORD_LEN);
pos += EAP_TTLS_CHAP_PASSWORD_LEN;
os_free(challenge);
AVP_PAD(buf, pos);
*resp = buf;
*resp_len = pos - buf;
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,
const struct eap_hdr *req,
struct eap_hdr *hdr,
u8 **resp, size_t *resp_len)
{
int res = 0;
size_t len;
if (data->phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 ||
data->phase2_type == EAP_TTLS_PHASE2_MSCHAP ||
data->phase2_type == EAP_TTLS_PHASE2_PAP ||
data->phase2_type == EAP_TTLS_PHASE2_CHAP) {
if (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 (data->phase2_type) {