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hostap/src/eap_server/eap_peap.c

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/*
* hostapd / EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
* 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 "sha1.h"
#include "eap_i.h"
#include "eap_tls_common.h"
#include "eap_common/eap_tlv_common.h"
#include "eap_common/eap_peap_common.h"
#include "tls.h"
#include "tncs.h"
/* Maximum supported PEAP version
* 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
* 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
* 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
*/
#define EAP_PEAP_VERSION 1
static void eap_peap_reset(struct eap_sm *sm, void *priv);
struct eap_peap_data {
struct eap_ssl_data ssl;
enum {
START, PHASE1, PHASE1_ID2, PHASE2_START, PHASE2_ID,
PHASE2_METHOD, PHASE2_SOH,
PHASE2_TLV, SUCCESS_REQ, FAILURE_REQ, SUCCESS, FAILURE
} state;
int peap_version;
int recv_version;
const struct eap_method *phase2_method;
void *phase2_priv;
int force_version;
struct wpabuf *pending_phase2_resp;
enum { TLV_REQ_NONE, TLV_REQ_SUCCESS, TLV_REQ_FAILURE } tlv_request;
int crypto_binding_sent;
int crypto_binding_used;
enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
u8 binding_nonce[32];
u8 ipmk[40];
u8 cmk[20];
u8 *phase2_key;
size_t phase2_key_len;
struct wpabuf *soh_response;
};
static const char * eap_peap_state_txt(int state)
{
switch (state) {
case START:
return "START";
case PHASE1:
return "PHASE1";
case PHASE1_ID2:
return "PHASE1_ID2";
case PHASE2_START:
return "PHASE2_START";
case PHASE2_ID:
return "PHASE2_ID";
case PHASE2_METHOD:
return "PHASE2_METHOD";
case PHASE2_SOH:
return "PHASE2_SOH";
case PHASE2_TLV:
return "PHASE2_TLV";
case SUCCESS_REQ:
return "SUCCESS_REQ";
case FAILURE_REQ:
return "FAILURE_REQ";
case SUCCESS:
return "SUCCESS";
case FAILURE:
return "FAILURE";
default:
return "Unknown?!";
}
}
static void eap_peap_state(struct eap_peap_data *data, int state)
{
wpa_printf(MSG_DEBUG, "EAP-PEAP: %s -> %s",
eap_peap_state_txt(data->state),
eap_peap_state_txt(state));
data->state = state;
}
static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
{
struct wpabuf *e;
struct eap_tlv_hdr *tlv;
if (buf == NULL)
return NULL;
/* Encapsulate EAP packet in EAP-Payload TLV */
wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
if (e == NULL) {
wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
"for TLV encapsulation");
wpabuf_free(buf);
return NULL;
}
tlv = wpabuf_put(e, sizeof(*tlv));
tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
EAP_TLV_EAP_PAYLOAD_TLV);
tlv->length = host_to_be16(wpabuf_len(buf));
wpabuf_put_buf(e, buf);
wpabuf_free(buf);
return e;
}
static void eap_peap_req_success(struct eap_sm *sm,
struct eap_peap_data *data)
{
if (data->state == FAILURE || data->state == FAILURE_REQ) {
eap_peap_state(data, FAILURE);
return;
}
if (data->peap_version == 0) {
data->tlv_request = TLV_REQ_SUCCESS;
eap_peap_state(data, PHASE2_TLV);
} else {
eap_peap_state(data, SUCCESS_REQ);
}
}
static void eap_peap_req_failure(struct eap_sm *sm,
struct eap_peap_data *data)
{
if (data->state == FAILURE || data->state == FAILURE_REQ ||
data->state == SUCCESS_REQ || data->tlv_request != TLV_REQ_NONE) {
eap_peap_state(data, FAILURE);
return;
}
if (data->peap_version == 0) {
data->tlv_request = TLV_REQ_FAILURE;
eap_peap_state(data, PHASE2_TLV);
} else {
eap_peap_state(data, FAILURE_REQ);
}
}
static void * eap_peap_init(struct eap_sm *sm)
{
struct eap_peap_data *data;
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
data->peap_version = EAP_PEAP_VERSION;
data->force_version = -1;
if (sm->user && sm->user->force_version >= 0) {
data->force_version = sm->user->force_version;
wpa_printf(MSG_DEBUG, "EAP-PEAP: forcing version %d",
data->force_version);
data->peap_version = data->force_version;
}
data->state = START;
data->crypto_binding = OPTIONAL_BINDING;
if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
eap_peap_reset(sm, data);
return NULL;
}
return data;
}
static void eap_peap_reset(struct eap_sm *sm, void *priv)
{
struct eap_peap_data *data = priv;
if (data == NULL)
return;
if (data->phase2_priv && data->phase2_method)
data->phase2_method->reset(sm, data->phase2_priv);
eap_server_tls_ssl_deinit(sm, &data->ssl);
wpabuf_free(data->pending_phase2_resp);
os_free(data->phase2_key);
wpabuf_free(data->soh_response);
os_free(data);
}
static struct wpabuf * eap_peap_build_start(struct eap_sm *sm,
struct eap_peap_data *data, u8 id)
{
struct wpabuf *req;
req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PEAP, 1,
EAP_CODE_REQUEST, id);
if (req == NULL) {
wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to allocate memory for"
" request");
eap_peap_state(data, FAILURE);
return NULL;
}
wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->peap_version);
eap_peap_state(data, PHASE1);
return req;
}
static struct wpabuf * eap_peap_build_phase2_req(struct eap_sm *sm,
struct eap_peap_data *data,
u8 id)
{
struct wpabuf *buf, *encr_req;
const u8 *req;
size_t req_len;
if (data->phase2_method == NULL || data->phase2_priv == NULL) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 method not ready");
return NULL;
}
buf = data->phase2_method->buildReq(sm, data->phase2_priv, id);
if (data->peap_version >= 2 && buf)
buf = eap_peapv2_tlv_eap_payload(buf);
if (buf == NULL)
return NULL;
req = wpabuf_head(buf);
req_len = wpabuf_len(buf);
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
req, req_len);
if (data->peap_version == 0 &&
data->phase2_method->method != EAP_TYPE_TLV) {
req += sizeof(struct eap_hdr);
req_len -= sizeof(struct eap_hdr);
}
encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
wpabuf_free(buf);
return encr_req;
}
#ifdef EAP_TNC
static struct wpabuf * eap_peap_build_phase2_soh(struct eap_sm *sm,
struct eap_peap_data *data,
u8 id)
{
struct wpabuf *buf1, *buf, *encr_req;
const u8 *req;
size_t req_len;
buf1 = tncs_build_soh_request();
if (buf1 == NULL)
return NULL;
buf = eap_msg_alloc(EAP_VENDOR_MICROSOFT, 0x21, wpabuf_len(buf1),
EAP_CODE_REQUEST, id);
if (buf == NULL) {
wpabuf_free(buf1);
return NULL;
}
wpabuf_put_buf(buf, buf1);
wpabuf_free(buf1);
req = wpabuf_head(buf);
req_len = wpabuf_len(buf);
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 SOH data",
req, req_len);
req += sizeof(struct eap_hdr);
req_len -= sizeof(struct eap_hdr);
encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
wpabuf_free(buf);
return encr_req;
}
#endif /* EAP_TNC */
static void eap_peap_get_isk(struct eap_peap_data *data,
u8 *isk, size_t isk_len)
{
size_t key_len;
os_memset(isk, 0, isk_len);
if (data->phase2_key == NULL)
return;
key_len = data->phase2_key_len;
if (key_len > isk_len)
key_len = isk_len;
os_memcpy(isk, data->phase2_key, key_len);
}
static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
{
u8 *tk;
u8 isk[32], imck[60];
/*
* Tunnel key (TK) is the first 60 octets of the key generated by
* phase 1 of PEAP (based on TLS).
*/
tk = eap_server_tls_derive_key(sm, &data->ssl, "client EAP encryption",
EAP_TLS_KEY_LEN);
if (tk == NULL)
return -1;
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
eap_peap_get_isk(data, isk, sizeof(isk));
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
/*
* IPMK Seed = "Inner Methods Compound Keys" | ISK
* TempKey = First 40 octets of TK
* IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
* (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
* in the end of the label just before ISK; is that just a typo?)
*/
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
peap_prfplus(data->peap_version, tk, 40, "Inner Methods Compound Keys",
isk, sizeof(isk), imck, sizeof(imck));
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
imck, sizeof(imck));
os_free(tk);
/* TODO: fast-connect: IPMK|CMK = TK */
os_memcpy(data->ipmk, imck, 40);
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
os_memcpy(data->cmk, imck + 40, 20);
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
return 0;
}
static struct wpabuf * eap_peap_build_phase2_tlv(struct eap_sm *sm,
struct eap_peap_data *data,
u8 id)
{
struct wpabuf *buf, *encr_req;
size_t len;
len = 6; /* Result TLV */
if (data->crypto_binding != NO_BINDING)
len += 60; /* Cryptobinding TLV */
#ifdef EAP_TNC
if (data->soh_response)
len += wpabuf_len(data->soh_response);
#endif /* EAP_TNC */
buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
EAP_CODE_REQUEST, id);
if (buf == NULL)
return NULL;
wpabuf_put_u8(buf, 0x80); /* Mandatory */
wpabuf_put_u8(buf, EAP_TLV_RESULT_TLV);
/* Length */
wpabuf_put_be16(buf, 2);
/* Status */
wpabuf_put_be16(buf, data->tlv_request == TLV_REQ_SUCCESS ?
EAP_TLV_RESULT_SUCCESS : EAP_TLV_RESULT_FAILURE);
if (data->peap_version == 0 && data->tlv_request == TLV_REQ_SUCCESS &&
data->crypto_binding != NO_BINDING) {
u8 *mac;
u8 eap_type = EAP_TYPE_PEAP;
const u8 *addr[2];
size_t len[2];
u16 tlv_type;
#ifdef EAP_TNC
if (data->soh_response) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Adding MS-SOH "
"Response TLV");
wpabuf_put_buf(buf, data->soh_response);
wpabuf_free(data->soh_response);
data->soh_response = NULL;
}
#endif /* EAP_TNC */
if (eap_peap_derive_cmk(sm, data) < 0 ||
os_get_random(data->binding_nonce, 32)) {
wpabuf_free(buf);
return NULL;
}
/* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
addr[0] = wpabuf_put(buf, 0);
len[0] = 60;
addr[1] = &eap_type;
len[1] = 1;
tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
if (data->peap_version >= 2)
tlv_type |= EAP_TLV_TYPE_MANDATORY;
wpabuf_put_be16(buf, tlv_type);
wpabuf_put_be16(buf, 56);
wpabuf_put_u8(buf, 0); /* Reserved */
wpabuf_put_u8(buf, data->peap_version); /* Version */
wpabuf_put_u8(buf, data->recv_version); /* RecvVersion */
wpabuf_put_u8(buf, 0); /* SubType: 0 = Request, 1 = Response */
wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
mac = wpabuf_put(buf, 20); /* Compound_MAC */
wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK",
data->cmk, 20);
wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
addr[0], len[0]);
wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
addr[1], len[1]);
hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC",
mac, SHA1_MAC_LEN);
data->crypto_binding_sent = 1;
}
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 TLV data",
buf);
encr_req = eap_server_tls_encrypt(sm, &data->ssl, wpabuf_head(buf),
wpabuf_len(buf));
wpabuf_free(buf);
return encr_req;
}
static struct wpabuf * eap_peap_build_phase2_term(struct eap_sm *sm,
struct eap_peap_data *data,
u8 id, int success)
{
struct wpabuf *encr_req;
size_t req_len;
struct eap_hdr *hdr;
req_len = sizeof(*hdr);
hdr = os_zalloc(req_len);
if (hdr == NULL)
return NULL;
hdr->code = success ? EAP_CODE_SUCCESS : EAP_CODE_FAILURE;
hdr->identifier = id;
hdr->length = host_to_be16(req_len);
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
(u8 *) hdr, req_len);
encr_req = eap_server_tls_encrypt(sm, &data->ssl, (u8 *) hdr, req_len);
os_free(hdr);
return encr_req;
}
static struct wpabuf * eap_peap_buildReq(struct eap_sm *sm, void *priv, u8 id)
{
struct eap_peap_data *data = priv;
if (data->ssl.state == FRAG_ACK) {
return eap_server_tls_build_ack(id, EAP_TYPE_PEAP,
data->peap_version);
}
if (data->ssl.state == WAIT_FRAG_ACK) {
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
data->peap_version, id);
}
switch (data->state) {
case START:
return eap_peap_build_start(sm, data, id);
case PHASE1:
case PHASE1_ID2:
if (data->peap_version < 2 &&
tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase1 done, "
"starting Phase2");
eap_peap_state(data, PHASE2_START);
}
break;
case PHASE2_ID:
case PHASE2_METHOD:
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_req(sm, data, id);
break;
#ifdef EAP_TNC
case PHASE2_SOH:
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_soh(sm, data, id);
break;
#endif /* EAP_TNC */
case PHASE2_TLV:
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_tlv(sm, data, id);
break;
case SUCCESS_REQ:
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_term(sm, data, id,
1);
break;
case FAILURE_REQ:
wpabuf_free(data->ssl.out_buf);
data->ssl.out_used = 0;
data->ssl.out_buf = eap_peap_build_phase2_term(sm, data, id,
0);
break;
default:
wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
__func__, data->state);
return NULL;
}
return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
data->peap_version, id);
}
static Boolean eap_peap_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_PEAP, respData, &len);
if (pos == NULL || len < 1) {
wpa_printf(MSG_INFO, "EAP-PEAP: Invalid frame");
return TRUE;
}
return FALSE;
}
static int eap_peap_phase2_init(struct eap_sm *sm, struct eap_peap_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 0;
}
static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
struct eap_peap_data *data,
const u8 *crypto_tlv,
size_t crypto_tlv_len)
{
u8 buf[61], mac[SHA1_MAC_LEN];
const u8 *pos;
if (crypto_tlv_len != 4 + 56) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
"length %d", (int) crypto_tlv_len);
return -1;
}
pos = crypto_tlv;
pos += 4; /* TLV header */
if (pos[1] != data->peap_version) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
"mismatch (was %d; expected %d)",
pos[1], data->peap_version);
return -1;
}
if (pos[3] != 1) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
"SubType %d", pos[3]);
return -1;
}
pos += 4;
pos += 32; /* Nonce */
/* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
os_memcpy(buf, crypto_tlv, 60);
os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
buf[60] = EAP_TYPE_PEAP;
hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
"cryptobinding TLV");
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK", data->cmk, 20);
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding seed data",
buf, 61);
return -1;
}
wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
return 0;
}
static void eap_peap_process_phase2_tlv(struct eap_sm *sm,
struct eap_peap_data *data,
struct wpabuf *in_data)
{
const u8 *pos;
size_t left;
const u8 *result_tlv = NULL, *crypto_tlv = NULL;
size_t result_tlv_len = 0, crypto_tlv_len = 0;
int tlv_type, mandatory, tlv_len;
pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, in_data, &left);
if (pos == NULL) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid EAP-TLV header");
return;
}
/* Parse TLVs */
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs", pos, left);
while (left >= 4) {
mandatory = !!(pos[0] & 0x80);
tlv_type = pos[0] & 0x3f;
tlv_type = (tlv_type << 8) | pos[1];
tlv_len = ((int) pos[2] << 8) | pos[3];
pos += 4;
left -= 4;
if ((size_t) tlv_len > left) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
"(tlv_len=%d left=%lu)", tlv_len,
(unsigned long) left);
eap_peap_state(data, FAILURE);
return;
}
switch (tlv_type) {
case EAP_TLV_RESULT_TLV:
result_tlv = pos;
result_tlv_len = tlv_len;
break;
case EAP_TLV_CRYPTO_BINDING_TLV:
crypto_tlv = pos;
crypto_tlv_len = tlv_len;
break;
default:
wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
"%d%s", tlv_type,
mandatory ? " (mandatory)" : "");
if (mandatory) {
eap_peap_state(data, FAILURE);
return;
}
/* Ignore this TLV, but process other TLVs */
break;
}
pos += tlv_len;
left -= tlv_len;
}
if (left) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
"Request (left=%lu)", (unsigned long) left);
eap_peap_state(data, FAILURE);
return;
}
/* Process supported TLVs */
if (crypto_tlv && data->crypto_binding_sent) {
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
crypto_tlv, crypto_tlv_len);
if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
crypto_tlv_len + 4) < 0) {
eap_peap_state(data, FAILURE);
return;
}
data->crypto_binding_used = 1;
} else if (!crypto_tlv && data->crypto_binding_sent &&
data->crypto_binding == REQUIRE_BINDING) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
eap_peap_state(data, FAILURE);
return;
}
if (result_tlv) {
int status;
const char *requested;
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Result TLV",
result_tlv, result_tlv_len);
if (result_tlv_len < 2) {
wpa_printf(MSG_INFO, "EAP-PEAP: Too short Result TLV "
"(len=%lu)",
(unsigned long) result_tlv_len);
eap_peap_state(data, FAILURE);
return;
}
requested = data->tlv_request == TLV_REQ_SUCCESS ? "Success" :
"Failure";
status = WPA_GET_BE16(result_tlv);
if (status == EAP_TLV_RESULT_SUCCESS) {
wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Success "
"- requested %s", requested);
if (data->tlv_request == TLV_REQ_SUCCESS)
eap_peap_state(data, SUCCESS);
else
eap_peap_state(data, FAILURE);
} else if (status == EAP_TLV_RESULT_FAILURE) {
wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Failure "
"- requested %s", requested);
eap_peap_state(data, FAILURE);
} else {
wpa_printf(MSG_INFO, "EAP-PEAP: Unknown TLV Result "
"Status %d", status);
eap_peap_state(data, FAILURE);
}
}
}
#ifdef EAP_TNC
static void eap_peap_process_phase2_soh(struct eap_sm *sm,
struct eap_peap_data *data,
struct wpabuf *in_data)
{
const u8 *pos, *vpos;
size_t left;
const u8 *soh_tlv = NULL;
size_t soh_tlv_len = 0;
int tlv_type, mandatory, tlv_len, vtlv_len;
u8 next_type;
u32 vendor_id;
pos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21, in_data, &left);
if (pos == NULL) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Not a valid SoH EAP "
"Extensions Method header - skip TNC");
goto auth_method;
}
/* Parse TLVs */
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs (SoH)", pos, left);
while (left >= 4) {
mandatory = !!(pos[0] & 0x80);
tlv_type = pos[0] & 0x3f;
tlv_type = (tlv_type << 8) | pos[1];
tlv_len = ((int) pos[2] << 8) | pos[3];
pos += 4;
left -= 4;
if ((size_t) tlv_len > left) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
"(tlv_len=%d left=%lu)", tlv_len,
(unsigned long) left);
eap_peap_state(data, FAILURE);
return;
}
switch (tlv_type) {
case EAP_TLV_VENDOR_SPECIFIC_TLV:
if (tlv_len < 4) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Too short "
"vendor specific TLV (len=%d)",
(int) tlv_len);
eap_peap_state(data, FAILURE);
return;
}
vendor_id = WPA_GET_BE32(pos);
if (vendor_id != EAP_VENDOR_MICROSOFT) {
if (mandatory) {
eap_peap_state(data, FAILURE);
return;
}
break;
}
vpos = pos + 4;
mandatory = !!(vpos[0] & 0x80);
tlv_type = vpos[0] & 0x3f;
tlv_type = (tlv_type << 8) | vpos[1];
vtlv_len = ((int) vpos[2] << 8) | vpos[3];
vpos += 4;
if (vpos + vtlv_len > pos + left) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Vendor TLV "
"underrun");
eap_peap_state(data, FAILURE);
return;
}
if (tlv_type == 1) {
soh_tlv = vpos;
soh_tlv_len = vtlv_len;
break;
}
wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported MS-TLV "
"Type %d%s", tlv_type,
mandatory ? " (mandatory)" : "");
if (mandatory) {
eap_peap_state(data, FAILURE);
return;
}
/* Ignore this TLV, but process other TLVs */
break;
default:
wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
"%d%s", tlv_type,
mandatory ? " (mandatory)" : "");
if (mandatory) {
eap_peap_state(data, FAILURE);
return;
}
/* Ignore this TLV, but process other TLVs */
break;
}
pos += tlv_len;
left -= tlv_len;
}
if (left) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
"Request (left=%lu)", (unsigned long) left);
eap_peap_state(data, FAILURE);
return;
}
/* Process supported TLVs */
if (soh_tlv) {
int failure = 0;
wpabuf_free(data->soh_response);
data->soh_response = tncs_process_soh(soh_tlv, soh_tlv_len,
&failure);
if (failure) {
eap_peap_state(data, FAILURE);
return;
}
} else {
wpa_printf(MSG_DEBUG, "EAP-PEAP: No SoH TLV received");
eap_peap_state(data, FAILURE);
return;
}
auth_method:
eap_peap_state(data, PHASE2_METHOD);
next_type = sm->user->methods[0].method;
sm->user_eap_method_index = 1;
wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP type %d", next_type);
eap_peap_phase2_init(sm, data, next_type);
}
#endif /* EAP_TNC */
static void eap_peap_process_phase2_response(struct eap_sm *sm,
struct eap_peap_data *data,
struct wpabuf *in_data)
{
u8 next_type = EAP_TYPE_NONE;
const struct eap_hdr *hdr;
const u8 *pos;
size_t left;
if (data->state == PHASE2_TLV) {
eap_peap_process_phase2_tlv(sm, data, in_data);
return;
}
#ifdef EAP_TNC
if (data->state == PHASE2_SOH) {
eap_peap_process_phase2_soh(sm, data, in_data);
return;
}
#endif /* EAP_TNC */
if (data->phase2_priv == NULL) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - Phase2 not "
"initialized?!", __func__);
return;
}
hdr = wpabuf_head(in_data);
pos = (const u8 *) (hdr + 1);
if (wpabuf_len(in_data) > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
left = wpabuf_len(in_data) - sizeof(*hdr);
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: 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-PEAP: try EAP type %d",
next_type);
} else {
eap_peap_req_failure(sm, data);
next_type = EAP_TYPE_NONE;
}
eap_peap_phase2_init(sm, data, next_type);
return;
}
if (data->phase2_method->check(sm, data->phase2_priv, in_data)) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 check() asked to "
"ignore the packet");
return;
}
data->phase2_method->process(sm, data->phase2_priv, in_data);
if (sm->method_pending == METHOD_PENDING_WAIT) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method is in "
"pending wait state - save decrypted response");
wpabuf_free(data->pending_phase2_resp);
data->pending_phase2_resp = wpabuf_dup(in_data);
}
if (!data->phase2_method->isDone(sm, data->phase2_priv))
return;
if (!data->phase2_method->isSuccess(sm, data->phase2_priv)) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method failed");
eap_peap_req_failure(sm, data);
next_type = EAP_TYPE_NONE;
eap_peap_phase2_init(sm, data, next_type);
return;
}
os_free(data->phase2_key);
if (data->phase2_method->getKey) {
data->phase2_key = data->phase2_method->getKey(
sm, data->phase2_priv, &data->phase2_key_len);
if (data->phase2_key == NULL) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 getKey "
"failed");
eap_peap_req_failure(sm, data);
eap_peap_phase2_init(sm, data, EAP_TYPE_NONE);
return;
}
if (data->phase2_key_len == 32 &&
data->phase2_method->vendor == EAP_VENDOR_IETF &&
data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
/*
* Microsoft uses reverse order for MS-MPPE keys in
* EAP-PEAP when compared to EAP-FAST derivation of
* ISK. Swap the keys here to get the correct ISK for
* EAP-PEAPv0 cryptobinding.
*/
u8 tmp[16];
os_memcpy(tmp, data->phase2_key, 16);
os_memcpy(data->phase2_key, data->phase2_key + 16, 16);
os_memcpy(data->phase2_key + 16, tmp, 16);
}
}
switch (data->state) {
case PHASE1_ID2:
case PHASE2_ID:
case PHASE2_SOH:
if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
wpa_hexdump_ascii(MSG_DEBUG, "EAP_PEAP: Phase2 "
"Identity not found in the user "
"database",
sm->identity, sm->identity_len);
eap_peap_req_failure(sm, data);
next_type = EAP_TYPE_NONE;
break;
}
#ifdef EAP_TNC
if (data->state != PHASE2_SOH && sm->tnc &&
data->peap_version == 0) {
eap_peap_state(data, PHASE2_SOH);
wpa_printf(MSG_DEBUG, "EAP-PEAP: Try to initialize "
"TNC (NAP SOH)");
next_type = EAP_TYPE_NONE;
break;
}
#endif /* EAP_TNC */
eap_peap_state(data, PHASE2_METHOD);
next_type = sm->user->methods[0].method;
sm->user_eap_method_index = 1;
wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP type %d", next_type);
break;
case PHASE2_METHOD:
eap_peap_req_success(sm, data);
next_type = EAP_TYPE_NONE;
break;
case FAILURE:
break;
default:
wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
__func__, data->state);
break;
}
eap_peap_phase2_init(sm, data, next_type);
}
static void eap_peap_process_phase2(struct eap_sm *sm,
struct eap_peap_data *data,
const struct wpabuf *respData,
struct wpabuf *in_buf)
{
struct wpabuf *in_decrypted;
int len_decrypted;
const struct eap_hdr *hdr;
size_t buf_len, len;
u8 *in_data;
size_t in_len;
in_data = wpabuf_mhead(in_buf);
in_len = wpabuf_len(in_buf);
wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
" Phase 2", (unsigned long) in_len);
if (data->pending_phase2_resp) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
"skip decryption and use old data");
eap_peap_process_phase2_response(sm, data,
data->pending_phase2_resp);
wpabuf_free(data->pending_phase2_resp);
data->pending_phase2_resp = NULL;
return;
}
buf_len = in_len;
/*
* Even though we try to disable TLS compression, it is possible that
* this cannot be done with all TLS libraries. Add extra buffer space
* to handle the possibility of the decrypted data being longer than
* input data.
*/
buf_len += 500;
buf_len *= 3;
in_decrypted = wpabuf_alloc(buf_len);
if (in_decrypted == NULL) {
wpa_printf(MSG_WARNING, "EAP-PEAP: failed to allocate memory "
"for decryption");
return;
}
len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
in_data, in_len,
wpabuf_mhead(in_decrypted),
buf_len);
if (len_decrypted < 0) {
wpa_printf(MSG_INFO, "EAP-PEAP: Failed to decrypt Phase 2 "
"data");
wpabuf_free(in_decrypted);
eap_peap_state(data, FAILURE);
return;
}
wpabuf_put(in_decrypted, len_decrypted);
wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
in_decrypted);
hdr = wpabuf_head(in_decrypted);
if (data->peap_version == 0 && data->state != PHASE2_TLV) {
const struct eap_hdr *resp;
struct eap_hdr *nhdr;
struct wpabuf *nbuf =
wpabuf_alloc(sizeof(struct eap_hdr) +
wpabuf_len(in_decrypted));
if (nbuf == NULL) {
wpabuf_free(in_decrypted);
return;
}
resp = wpabuf_head(respData);
nhdr = wpabuf_put(nbuf, sizeof(*nhdr));
nhdr->code = resp->code;
nhdr->identifier = resp->identifier;
nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
wpabuf_len(in_decrypted));
wpabuf_put_buf(nbuf, in_decrypted);
wpabuf_free(in_decrypted);
in_decrypted = nbuf;
} else if (data->peap_version >= 2) {
struct eap_tlv_hdr *tlv;
struct wpabuf *nmsg;
if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
"EAP TLV");
wpabuf_free(in_decrypted);
return;
}
tlv = wpabuf_mhead(in_decrypted);
if ((be_to_host16(tlv->tlv_type) & EAP_TLV_TYPE_MASK) !=
EAP_TLV_EAP_PAYLOAD_TLV) {
wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
wpabuf_free(in_decrypted);
return;
}
if (sizeof(*tlv) + be_to_host16(tlv->length) >
wpabuf_len(in_decrypted)) {
wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
"length");
wpabuf_free(in_decrypted);
return;
}
hdr = (struct eap_hdr *) (tlv + 1);
if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
"EAP packet in EAP TLV");
wpabuf_free(in_decrypted);
return;
}
nmsg = wpabuf_alloc(be_to_host16(hdr->length));
if (nmsg == NULL) {
wpabuf_free(in_decrypted);
return;
}
wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
wpabuf_free(in_decrypted);
in_decrypted = nmsg;
}
hdr = wpabuf_head(in_decrypted);
if (wpabuf_len(in_decrypted) < (int) sizeof(*hdr)) {
wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
"EAP frame (len=%lu)",
(unsigned long) wpabuf_len(in_decrypted));
wpabuf_free(in_decrypted);
eap_peap_req_failure(sm, data);
return;
}
len = be_to_host16(hdr->length);
if (len > wpabuf_len(in_decrypted)) {
wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
"Phase 2 EAP frame (len=%lu hdr->length=%lu)",
(unsigned long) wpabuf_len(in_decrypted),
(unsigned long) len);
wpabuf_free(in_decrypted);
eap_peap_req_failure(sm, data);
return;
}
wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
"identifier=%d length=%lu", hdr->code, hdr->identifier,
(unsigned long) len);
switch (hdr->code) {
case EAP_CODE_RESPONSE:
eap_peap_process_phase2_response(sm, data, in_decrypted);
break;
case EAP_CODE_SUCCESS:
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
if (data->state == SUCCESS_REQ) {
eap_peap_state(data, SUCCESS);
}
break;
case EAP_CODE_FAILURE:
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
eap_peap_state(data, FAILURE);
break;
default:
wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
"Phase 2 EAP header", hdr->code);
break;
}
os_free(in_decrypted);
}
static int eap_peapv2_start_phase2(struct eap_sm *sm,
struct eap_peap_data *data)
{
struct wpabuf *buf, *buf2;
int res;
wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Phase1 done, include first Phase2 "
"payload in the same message");
eap_peap_state(data, PHASE1_ID2);
if (eap_peap_phase2_init(sm, data, EAP_TYPE_IDENTITY))
return -1;
/* TODO: which Id to use here? */
buf = data->phase2_method->buildReq(sm, data->phase2_priv, 6);
if (buf == NULL)
return -1;
buf2 = eap_peapv2_tlv_eap_payload(buf);
if (buf2 == NULL)
return -1;
wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAPv2: Identity Request", buf2);
buf = wpabuf_alloc(data->ssl.tls_out_limit);
if (buf == NULL) {
wpabuf_free(buf2);
return -1;
}
res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
wpabuf_head(buf2), wpabuf_len(buf2),
wpabuf_put(buf, 0),
data->ssl.tls_out_limit);
wpabuf_free(buf2);
if (res < 0) {
wpa_printf(MSG_INFO, "EAP-PEAPv2: Failed to encrypt Phase 2 "
"data");
wpabuf_free(buf);
return -1;
}
wpabuf_put(buf, res);
wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAPv2: Encrypted Identity Request",
buf);
/* Append TLS data into the pending buffer after the Server Finished */
if (wpabuf_resize(&data->ssl.out_buf, wpabuf_len(buf)) < 0) {
wpabuf_free(buf);
return -1;
}
wpabuf_put_buf(data->ssl.out_buf, buf);
wpabuf_free(buf);
return 0;
}
static int eap_peap_process_version(struct eap_sm *sm, void *priv,
int peer_version)
{
struct eap_peap_data *data = priv;
data->recv_version = peer_version;
if (data->force_version >= 0 && peer_version != data->force_version) {
wpa_printf(MSG_INFO, "EAP-PEAP: peer did not select the forced"
" version (forced=%d peer=%d) - reject",
data->force_version, peer_version);
return -1;
}
if (peer_version < data->peap_version) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: peer ver=%d, own ver=%d; "
"use version %d",
peer_version, data->peap_version, peer_version);
data->peap_version = peer_version;
}
return 0;
}
static void eap_peap_process_msg(struct eap_sm *sm, void *priv,
const struct wpabuf *respData)
{
struct eap_peap_data *data = priv;
switch (data->state) {
case PHASE1:
if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
eap_peap_state(data, FAILURE);
break;
}
if (data->peap_version >= 2 &&
tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
if (eap_peapv2_start_phase2(sm, data)) {
eap_peap_state(data, FAILURE);
break;
}
}
break;
case PHASE2_START:
eap_peap_state(data, PHASE2_ID);
eap_peap_phase2_init(sm, data, EAP_TYPE_IDENTITY);
break;
case PHASE1_ID2:
case PHASE2_ID:
case PHASE2_METHOD:
case PHASE2_SOH:
case PHASE2_TLV:
eap_peap_process_phase2(sm, data, respData, data->ssl.in_buf);
break;
case SUCCESS_REQ:
eap_peap_state(data, SUCCESS);
break;
case FAILURE_REQ:
eap_peap_state(data, FAILURE);
break;
default:
wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected state %d in %s",
data->state, __func__);
break;
}
}
static void eap_peap_process(struct eap_sm *sm, void *priv,
struct wpabuf *respData)
{
struct eap_peap_data *data = priv;
if (eap_server_tls_process(sm, &data->ssl, respData, data,
EAP_TYPE_PEAP, eap_peap_process_version,
eap_peap_process_msg) < 0)
eap_peap_state(data, FAILURE);
}
static Boolean eap_peap_isDone(struct eap_sm *sm, void *priv)
{
struct eap_peap_data *data = priv;
return data->state == SUCCESS || data->state == FAILURE;
}
static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_peap_data *data = priv;
u8 *eapKeyData;
if (data->state != SUCCESS)
return NULL;
if (data->crypto_binding_used) {
u8 csk[128];
/*
* Note: It looks like Microsoft implementation requires null
* termination for this label while the one used for deriving
* IPMK|CMK did not use null termination.
*/
peap_prfplus(data->peap_version, data->ipmk, 40,
"Session Key Generating Function",
(u8 *) "\00", 1, csk, sizeof(csk));
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
eapKeyData = os_malloc(EAP_TLS_KEY_LEN);
if (eapKeyData) {
os_memcpy(eapKeyData, csk, EAP_TLS_KEY_LEN);
*len = EAP_TLS_KEY_LEN;
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
eapKeyData, EAP_TLS_KEY_LEN);
} else {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive "
"key");
}
return eapKeyData;
}
/* TODO: PEAPv1 - different label in some cases */
eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
"client EAP encryption",
EAP_TLS_KEY_LEN);
if (eapKeyData) {
*len = EAP_TLS_KEY_LEN;
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
eapKeyData, EAP_TLS_KEY_LEN);
} else {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive key");
}
return eapKeyData;
}
static Boolean eap_peap_isSuccess(struct eap_sm *sm, void *priv)
{
struct eap_peap_data *data = priv;
return data->state == SUCCESS;
}
int eap_server_peap_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
if (eap == NULL)
return -1;
eap->init = eap_peap_init;
eap->reset = eap_peap_reset;
eap->buildReq = eap_peap_buildReq;
eap->check = eap_peap_check;
eap->process = eap_peap_process;
eap->isDone = eap_peap_isDone;
eap->getKey = eap_peap_getKey;
eap->isSuccess = eap_peap_isSuccess;
ret = eap_server_method_register(eap);
if (ret)
eap_server_method_free(eap);
return ret;
}
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