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freebsd-dev/contrib/wpa_supplicant/eap_peap.c
Sam Leffler f2afa83e72 Import of WPA supplicant 0.5.10
2008-03-24 19:46:53 +00:00

896 lines
25 KiB
C
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/*
* EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-07.txt)
* Copyright (c) 2004-2006, 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 "eap_i.h"
#include "eap_tls_common.h"
#include "config_ssid.h"
#include "tls.h"
#include "eap_tlv.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-07.txt
*/
#define EAP_PEAP_VERSION 1
static void eap_peap_deinit(struct eap_sm *sm, void *priv);
struct eap_peap_data {
struct eap_ssl_data ssl;
int peap_version, force_peap_version, force_new_label;
const struct eap_method *phase2_method;
void *phase2_priv;
int phase2_success;
int phase2_eap_success;
int phase2_eap_started;
struct eap_method_type phase2_type;
struct eap_method_type *phase2_types;
size_t num_phase2_types;
int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
* EAP-Success
* 1 = reply with tunneled EAP-Success to inner
* EAP-Success and expect AS to send outer
* (unencrypted) EAP-Success after this
* 2 = reply with PEAP/TLS ACK to inner
* EAP-Success and expect AS to send outer
* (unencrypted) EAP-Success after this */
int resuming; /* starting a resumed session */
u8 *key_data;
u8 *pending_phase2_req;
size_t pending_phase2_req_len;
};
static void * eap_peap_init(struct eap_sm *sm)
{
struct eap_peap_data *data;
struct wpa_ssid *config = eap_get_config(sm);
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
sm->peap_done = FALSE;
data->peap_version = EAP_PEAP_VERSION;
data->force_peap_version = -1;
data->peap_outer_success = 2;
if (config && config->phase1) {
char *pos = os_strstr(config->phase1, "peapver=");
if (pos) {
data->force_peap_version = atoi(pos + 8);
data->peap_version = data->force_peap_version;
wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version "
"%d", data->force_peap_version);
}
if (os_strstr(config->phase1, "peaplabel=1")) {
data->force_new_label = 1;
wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for "
"key derivation");
}
if (os_strstr(config->phase1, "peap_outer_success=0")) {
data->peap_outer_success = 0;
wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate "
"authentication on tunneled EAP-Success");
} else if (os_strstr(config->phase1, "peap_outer_success=1")) {
data->peap_outer_success = 1;
wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled "
"EAP-Success after receiving tunneled "
"EAP-Success");
} else if (os_strstr(config->phase1, "peap_outer_success=2")) {
data->peap_outer_success = 2;
wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK "
"after receiving tunneled EAP-Success");
}
}
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_peap_deinit(sm, data);
return NULL;
}
while (start && *start != '\0') {
int vendor;
pos = os_strstr(start, "auth=");
if (pos == NULL)
break;
if (start != pos && *(pos - 1) != ' ') {
start = pos + 5;
continue;
}
start = pos + 5;
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-PEAP: Unsupported "
"Phase2 method '%s'", start);
} else {
num_methods++;
_methods = os_realloc(
methods,
num_methods * sizeof(*methods));
if (_methods == NULL) {
os_free(methods);
os_free(buf);
eap_peap_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_types = methods;
data->num_phase2_types = num_methods;
}
if (data->phase2_types == NULL) {
data->phase2_types =
eap_get_phase2_types(config, &data->num_phase2_types);
}
if (data->phase2_types == NULL) {
wpa_printf(MSG_ERROR, "EAP-PEAP: No Phase2 method available");
eap_peap_deinit(sm, data);
return NULL;
}
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Phase2 EAP types",
(u8 *) data->phase2_types,
data->num_phase2_types * sizeof(struct eap_method_type));
data->phase2_type.vendor = EAP_VENDOR_IETF;
data->phase2_type.method = EAP_TYPE_NONE;
if (eap_tls_ssl_init(sm, &data->ssl, config)) {
wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
eap_peap_deinit(sm, data);
return NULL;
}
return data;
}
static void eap_peap_deinit(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->deinit(sm, data->phase2_priv);
os_free(data->phase2_types);
eap_tls_ssl_deinit(sm, &data->ssl);
os_free(data->key_data);
os_free(data->pending_phase2_req);
os_free(data);
}
static int eap_peap_encrypt(struct eap_sm *sm, struct eap_peap_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.
* Note: Microsoft IAS did not seem to like TLS Message Length with
* PEAP/MSCHAPv2. */
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_PEAP;
*pos++ = data->peap_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-PEAP: 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 int eap_peap_phase2_nak(struct eap_peap_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-PEAP: Phase 2 Request: Nak type=%d", *pos);
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Allowed Phase2 EAP types",
(u8 *) data->phase2_types,
data->num_phase2_types * sizeof(struct eap_method_type));
*resp_len = sizeof(struct eap_hdr) + 1;
*resp = os_malloc(*resp_len + data->num_phase2_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_types; i++) {
if (data->phase2_types[i].vendor == EAP_VENDOR_IETF &&
data->phase2_types[i].method < 256) {
(*resp_len)++;
*pos++ = data->phase2_types[i].method;
}
}
resp_hdr->length = host_to_be16(*resp_len);
return 0;
}
static int eap_peap_phase2_request(struct eap_sm *sm,
struct eap_peap_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-PEAP: too short "
"Phase 2 request (len=%lu)", (unsigned long) len);
return -1;
}
pos = (u8 *) (hdr + 1);
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
switch (*pos) {
case EAP_TYPE_IDENTITY:
*resp = eap_sm_buildIdentity(sm, hdr->identifier, resp_len, 1);
break;
case EAP_TYPE_TLV:
os_memset(&iret, 0, sizeof(iret));
if (eap_tlv_process(sm, &iret, hdr, resp, resp_len,
data->phase2_eap_started &&
!data->phase2_eap_success)) {
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
return -1;
}
if (iret.methodState == METHOD_DONE ||
iret.methodState == METHOD_MAY_CONT) {
ret->methodState = iret.methodState;
ret->decision = iret.decision;
data->phase2_success = 1;
}
break;
default:
if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
data->phase2_type.method == EAP_TYPE_NONE) {
size_t i;
for (i = 0; i < data->num_phase2_types; i++) {
if (data->phase2_types[i].vendor !=
EAP_VENDOR_IETF ||
data->phase2_types[i].method != *pos)
continue;
data->phase2_type.vendor =
data->phase2_types[i].vendor;
data->phase2_type.method =
data->phase2_types[i].method;
wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
"Phase 2 EAP vendor %d method %d",
data->phase2_type.vendor,
data->phase2_type.method);
break;
}
}
if (*pos != data->phase2_type.method ||
*pos == EAP_TYPE_NONE) {
if (eap_peap_phase2_nak(data, hdr, resp, resp_len))
return -1;
return 0;
}
if (data->phase2_priv == NULL) {
data->phase2_method = eap_sm_get_eap_methods(
data->phase2_type.vendor,
data->phase2_type.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-PEAP: failed to initialize "
"Phase 2 EAP method %d", *pos);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
return -1;
}
data->phase2_eap_started = 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)) {
data->phase2_eap_success = 1;
data->phase2_success = 1;
}
break;
}
if (*resp == NULL &&
(config->pending_req_identity || config->pending_req_password ||
config->pending_req_otp || config->pending_req_new_password)) {
os_free(data->pending_phase2_req);
data->pending_phase2_req = os_malloc(len);
if (data->pending_phase2_req) {
os_memcpy(data->pending_phase2_req, hdr, len);
data->pending_phase2_req_len = len;
}
}
return 0;
}
static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
struct eap_method_ret *ret,
const struct eap_hdr *req,
const u8 *in_data, size_t in_len,
u8 **out_data, size_t *out_len)
{
u8 *in_decrypted;
int res, skip_change = 0;
struct eap_hdr *hdr, *rhdr;
u8 *resp = NULL;
size_t resp_len, len_decrypted, len, buf_len;
const u8 *msg;
size_t msg_len;
int need_more_input;
wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
" Phase 2", (unsigned long) in_len);
if (data->pending_phase2_req) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
"skip decryption and use old data");
/* Clear TLS reassembly state. */
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
data->ssl.tls_in_left = 0;
data->ssl.tls_in_total = 0;
in_decrypted = data->pending_phase2_req;
data->pending_phase2_req = NULL;
len_decrypted = data->pending_phase2_req_len;
skip_change = 1;
goto continue_req;
}
msg = eap_tls_data_reassemble(sm, &data->ssl, in_data, in_len,
&msg_len, &need_more_input);
if (msg == NULL)
return need_more_input ? 1 : -1;
if (in_len == 0 && sm->workaround && data->phase2_success) {
/*
* Cisco ACS seems to be using TLS ACK to terminate
* EAP-PEAPv0/GTC. Try to reply with TLS ACK.
*/
wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
"expected data - acknowledge with TLS ACK since "
"Phase 2 has been completed");
ret->decision = DECISION_COND_SUCC;
ret->methodState = METHOD_DONE;
return 1;
}
buf_len = in_len;
if (data->ssl.tls_in_total > buf_len)
buf_len = data->ssl.tls_in_total;
in_decrypted = os_malloc(buf_len);
if (in_decrypted == NULL) {
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
wpa_printf(MSG_WARNING, "EAP-PEAP: failed to allocate memory "
"for decryption");
return -1;
}
res = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
msg, msg_len, in_decrypted, buf_len);
os_free(data->ssl.tls_in);
data->ssl.tls_in = NULL;
data->ssl.tls_in_len = 0;
if (res < 0) {
wpa_printf(MSG_INFO, "EAP-PEAP: Failed to decrypt Phase 2 "
"data");
os_free(in_decrypted);
return 0;
}
len_decrypted = res;
continue_req:
wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP", in_decrypted,
len_decrypted);
hdr = (struct eap_hdr *) in_decrypted;
if (len_decrypted == 5 && hdr->code == EAP_CODE_REQUEST &&
be_to_host16(hdr->length) == 5 &&
in_decrypted[4] == EAP_TYPE_IDENTITY) {
/* At least FreeRADIUS seems to send full EAP header with
* EAP Request Identity */
skip_change = 1;
}
if (len_decrypted >= 5 && hdr->code == EAP_CODE_REQUEST &&
in_decrypted[4] == EAP_TYPE_TLV) {
skip_change = 1;
}
if (data->peap_version == 0 && !skip_change) {
struct eap_hdr *nhdr = os_malloc(sizeof(struct eap_hdr) +
len_decrypted);
if (nhdr == NULL) {
os_free(in_decrypted);
return 0;
}
os_memcpy((u8 *) (nhdr + 1), in_decrypted, len_decrypted);
os_free(in_decrypted);
nhdr->code = req->code;
nhdr->identifier = req->identifier;
nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
len_decrypted);
len_decrypted += sizeof(struct eap_hdr);
in_decrypted = (u8 *) nhdr;
}
hdr = (struct eap_hdr *) in_decrypted;
if (len_decrypted < sizeof(*hdr)) {
os_free(in_decrypted);
wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
"EAP frame (len=%lu)",
(unsigned long) len_decrypted);
return 0;
}
len = be_to_host16(hdr->length);
if (len > len_decrypted) {
os_free(in_decrypted);
wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
"Phase 2 EAP frame (len=%lu hdr->length=%lu)",
(unsigned long) len_decrypted, (unsigned long) len);
return 0;
}
if (len < len_decrypted) {
wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
"shorter length than full decrypted data "
"(%lu < %lu)",
(unsigned long) len, (unsigned long) len_decrypted);
if (sm->workaround && len == 4 && len_decrypted == 5 &&
in_decrypted[4] == EAP_TYPE_IDENTITY) {
/* Radiator 3.9 seems to set Phase 2 EAP header to use
* incorrect length for the EAP-Request Identity
* packet, so fix the inner header to interoperate..
* This was fixed in 2004-06-23 patch for Radiator and
* this workaround can be removed at some point. */
wpa_printf(MSG_INFO, "EAP-PEAP: workaround -> replace "
"Phase 2 EAP header len (%lu) with real "
"decrypted len (%lu)",
(unsigned long) len,
(unsigned long) len_decrypted);
len = len_decrypted;
hdr->length = host_to_be16(len);
}
}
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_REQUEST:
if (eap_peap_phase2_request(sm, data, ret, hdr,
&resp, &resp_len)) {
os_free(in_decrypted);
wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
"processing failed");
return 0;
}
break;
case EAP_CODE_SUCCESS:
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
if (data->peap_version == 1) {
/* EAP-Success within TLS tunnel is used to indicate
* shutdown of the TLS channel. The authentication has
* been completed. */
if (data->phase2_eap_started &&
!data->phase2_eap_success) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
"Success used to indicate success, "
"but Phase 2 EAP was not yet "
"completed successfully");
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
os_free(in_decrypted);
return 0;
}
wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
"EAP-Success within TLS tunnel - "
"authentication completed");
ret->decision = DECISION_UNCOND_SUCC;
ret->methodState = METHOD_DONE;
data->phase2_success = 1;
if (data->peap_outer_success == 2) {
os_free(in_decrypted);
wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
"to finish authentication");
return 1;
} else if (data->peap_outer_success == 1) {
/* Reply with EAP-Success within the TLS
* channel to complete the authentication. */
resp_len = sizeof(struct eap_hdr);
resp = os_zalloc(resp_len);
if (resp) {
rhdr = (struct eap_hdr *) resp;
rhdr->code = EAP_CODE_SUCCESS;
rhdr->identifier = hdr->identifier;
rhdr->length = host_to_be16(resp_len);
}
} else {
/* No EAP-Success expected for Phase 1 (outer,
* unencrypted auth), so force EAP state
* machine to SUCCESS state. */
sm->peap_done = TRUE;
}
} else {
/* FIX: ? */
}
break;
case EAP_CODE_FAILURE:
wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
ret->decision = DECISION_FAIL;
ret->methodState = METHOD_MAY_CONT;
ret->allowNotifications = FALSE;
/* Reply with EAP-Failure within the TLS channel to complete
* failure reporting. */
resp_len = sizeof(struct eap_hdr);
resp = os_zalloc(resp_len);
if (resp) {
rhdr = (struct eap_hdr *) resp;
rhdr->code = EAP_CODE_FAILURE;
rhdr->identifier = hdr->identifier;
rhdr->length = host_to_be16(resp_len);
}
break;
default:
wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
"Phase 2 EAP header", hdr->code);
break;
}
os_free(in_decrypted);
if (resp) {
u8 *resp_pos;
size_t resp_send_len;
int skip_change2 = 0;
wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
resp, resp_len);
/* PEAP version changes */
if (resp_len >= 5 && resp[0] == EAP_CODE_RESPONSE &&
resp[4] == EAP_TYPE_TLV)
skip_change2 = 1;
if (data->peap_version == 0 && !skip_change2) {
resp_pos = resp + sizeof(struct eap_hdr);
resp_send_len = resp_len - sizeof(struct eap_hdr);
} else {
resp_pos = resp;
resp_send_len = resp_len;
}
if (eap_peap_encrypt(sm, data, req->identifier,
resp_pos, resp_send_len,
out_data, out_len)) {
wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
"a Phase 2 frame");
}
os_free(resp);
}
return 0;
}
static u8 * eap_peap_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const u8 *reqData, size_t reqDataLen,
size_t *respDataLen)
{
const struct eap_hdr *req;
size_t left;
int res;
u8 flags, *resp, id;
const u8 *pos;
struct eap_peap_data *data = priv;
pos = eap_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
reqData, reqDataLen, &left, &flags);
if (pos == NULL)
return NULL;
req = (const struct eap_hdr *) reqData;
id = req->identifier;
if (flags & EAP_TLS_FLAGS_START) {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
"ver=%d)", flags & EAP_PEAP_VERSION_MASK,
data->peap_version);
if ((flags & EAP_PEAP_VERSION_MASK) < data->peap_version)
data->peap_version = flags & EAP_PEAP_VERSION_MASK;
if (data->force_peap_version >= 0 &&
data->force_peap_version != data->peap_version) {
wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
"forced PEAP version %d",
data->force_peap_version);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
ret->allowNotifications = FALSE;
return NULL;
}
wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
data->peap_version);
left = 0; /* make sure that this frame is empty, even though it
* should always be, anyway */
}
resp = NULL;
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
!data->resuming) {
res = eap_peap_decrypt(sm, data, ret, req, pos, left,
&resp, respDataLen);
} else {
res = eap_tls_process_helper(sm, &data->ssl, EAP_TYPE_PEAP,
data->peap_version, id, pos, left,
&resp, respDataLen);
if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
char *label;
wpa_printf(MSG_DEBUG,
"EAP-PEAP: TLS done, proceed to Phase 2");
os_free(data->key_data);
/* draft-josefsson-ppext-eap-tls-eap-05.txt
* specifies that PEAPv1 would use "client PEAP
* encryption" as the label. However, most existing
* PEAPv1 implementations seem to be using the old
* label, "client EAP encryption", instead. Use the old
* label by default, but allow it to be configured with
* phase1 parameter peaplabel=1. */
if (data->peap_version > 1 || data->force_new_label)
label = "client PEAP encryption";
else
label = "client EAP encryption";
wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
"key derivation", label);
data->key_data =
eap_tls_derive_key(sm, &data->ssl, label,
EAP_TLS_KEY_LEN);
if (data->key_data) {
wpa_hexdump_key(MSG_DEBUG,
"EAP-PEAP: Derived key",
data->key_data,
EAP_TLS_KEY_LEN);
} else {
wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
"derive key");
}
if (sm->workaround && data->resuming) {
/*
* At least few RADIUS servers (Aegis v1.1.6;
* but not v1.1.4; and Cisco ACS) seem to be
* terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
* ACS) session resumption with outer
* EAP-Success. This does not seem to follow
* draft-josefsson-pppext-eap-tls-eap-05.txt
* section 4.2, so only allow this if EAP
* workarounds are enabled.
*/
wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
"allow outer EAP-Success to "
"terminate PEAP resumption");
ret->decision = DECISION_COND_SUCC;
data->phase2_success = 1;
}
data->resuming = 0;
}
if (res == 2) {
/*
* Application data included in the handshake message.
*/
os_free(data->pending_phase2_req);
data->pending_phase2_req = resp;
data->pending_phase2_req_len = *respDataLen;
resp = NULL;
*respDataLen = 0;
res = eap_peap_decrypt(sm, data, ret, req, pos, left,
&resp, respDataLen);
}
}
if (ret->methodState == METHOD_DONE) {
ret->allowNotifications = FALSE;
}
if (res == 1) {
return eap_tls_build_ack(&data->ssl, respDataLen, id,
EAP_TYPE_PEAP, data->peap_version);
}
return resp;
}
static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
{
struct eap_peap_data *data = priv;
return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
data->phase2_success;
}
static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_peap_data *data = priv;
os_free(data->pending_phase2_req);
data->pending_phase2_req = NULL;
}
static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
{
struct eap_peap_data *data = priv;
os_free(data->key_data);
data->key_data = NULL;
if (eap_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_success = 0;
data->phase2_eap_success = 0;
data->phase2_eap_started = 0;
data->resuming = 1;
sm->peap_done = FALSE;
return priv;
}
static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
size_t buflen, int verbose)
{
struct eap_peap_data *data = priv;
int len, ret;
len = eap_tls_status(sm, &data->ssl, buf, buflen, verbose);
if (data->phase2_method) {
ret = os_snprintf(buf + len, buflen - len,
"EAP-PEAPv%d Phase2 method=%s\n",
data->peap_version,
data->phase2_method->name);
if (ret < 0 || (size_t) ret >= buflen - len)
return len;
len += ret;
}
return len;
}
static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
{
struct eap_peap_data *data = priv;
return data->key_data != NULL && data->phase2_success;
}
static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
struct eap_peap_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_peap_register(void)
{
struct eap_method *eap;
int ret;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
if (eap == NULL)
return -1;
eap->init = eap_peap_init;
eap->deinit = eap_peap_deinit;
eap->process = eap_peap_process;
eap->isKeyAvailable = eap_peap_isKeyAvailable;
eap->getKey = eap_peap_getKey;
eap->get_status = eap_peap_get_status;
eap->has_reauth_data = eap_peap_has_reauth_data;
eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
eap->init_for_reauth = eap_peap_init_for_reauth;
ret = eap_peer_method_register(eap);
if (ret)
eap_peer_method_free(eap);
return ret;
}
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