/*
* WPA Supplicant / EAP-TLS/PEAP/TTLS/FAST common functions
* Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "eap_i.h"
#include "eap_tls_common.h"
#include "wpa_supplicant.h"
#include "config_ssid.h"
#include "md5.h"
#include "sha1.h"
#include "tls.h"
int eap_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
struct wpa_ssid *config)
{
int ret = -1;
char *ca_cert, *client_cert, *private_key, *private_key_passwd,
*dh_file, *subject_match;
data->eap = sm;
data->phase2 = sm->init_phase2;
if (config == NULL) {
ca_cert = NULL;
client_cert = NULL;
private_key = NULL;
private_key_passwd = NULL;
dh_file = NULL;
subject_match = NULL;
} else if (data->phase2) {
ca_cert = (char *) config->ca_cert2;
client_cert = (char *) config->client_cert2;
private_key = (char *) config->private_key2;
private_key_passwd = (char *) config->private_key2_passwd;
dh_file = (char *) config->dh_file2;
subject_match = (char *) config->subject_match2;
} else {
ca_cert = (char *) config->ca_cert;
client_cert = (char *) config->client_cert;
private_key = (char *) config->private_key;
private_key_passwd = (char *) config->private_key_passwd;
dh_file = (char *) config->dh_file;
subject_match = (char *) config->subject_match;
}
data->conn = tls_connection_init(sm->ssl_ctx);
if (data->conn == NULL) {
wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
"connection");
goto done;
}
if (tls_connection_ca_cert(sm->ssl_ctx, data->conn, ca_cert,
subject_match)) {
wpa_printf(MSG_INFO, "TLS: Failed to load root certificate "
"'%s'", ca_cert);
goto done;
}
if (tls_connection_client_cert(sm->ssl_ctx, data->conn, client_cert)) {
wpa_printf(MSG_INFO, "TLS: Failed to load client certificate "
"'%s'", client_cert);
goto done;
}
if (tls_connection_private_key(sm->ssl_ctx, data->conn, private_key,
private_key_passwd)) {
wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
private_key);
goto done;
}
if (dh_file && tls_connection_dh(sm->ssl_ctx, data->conn, dh_file)) {
wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
dh_file);
goto done;
}
/* TODO: make this configurable */
data->tls_out_limit = 1398;
if (data->phase2) {
/* Limit the fragment size in the inner TLS authentication
* since the outer authentication with EAP-PEAP does not yet
* support fragmentation */
if (data->tls_out_limit > 100)
data->tls_out_limit -= 100;
}
if (config && config->phase1 &&
strstr(config->phase1, "include_tls_length=1")) {
wpa_printf(MSG_DEBUG, "TLS: Include TLS Message Length in "
"unfragmented packets");
data->include_tls_length = 1;
}
ret = 0;
done:
return ret;
}
void eap_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
{
tls_connection_deinit(sm->ssl_ctx, data->conn);
free(data->tls_in);
free(data->tls_out);
}
u8 * eap_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
char *label, size_t len)
{
struct tls_keys keys;
u8 *random;
u8 *out;
if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
return NULL;
out = malloc(len);
random = malloc(keys.client_random_len + keys.server_random_len);
if (out == NULL || random == NULL) {
free(out);
free(random);
return NULL;
}
memcpy(random, keys.client_random, keys.client_random_len);
memcpy(random + keys.client_random_len, keys.server_random,
keys.server_random_len);
if (tls_prf(keys.master_key, keys.master_key_len,
label, random, keys.client_random_len +
keys.server_random_len, out, len)) {
free(random);
free(out);
return NULL;
}
free(random);
return out;
}
int eap_tls_data_reassemble(struct eap_sm *sm, struct eap_ssl_data *data,
u8 **in_data, size_t *in_len)
{
u8 *buf;
if (data->tls_in_left > *in_len || data->tls_in) {
buf = realloc(data->tls_in, data->tls_in_len + *in_len);
if (buf == NULL) {
free(data->tls_in);
data->tls_in = NULL;
data->tls_in_len = 0;
wpa_printf(MSG_INFO, "SSL: Could not allocate memory "
"for TLS data");
return -1;
}
memcpy(buf + data->tls_in_len, *in_data, *in_len);
data->tls_in = buf;
data->tls_in_len += *in_len;
if (*in_len > data->tls_in_left) {
wpa_printf(MSG_INFO, "SSL: more data than TLS message "
"length indicated");
data->tls_in_left = 0;
return -1;
}
data->tls_in_left -= *in_len;
if (data->tls_in_left > 0) {
wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input "
"data", (unsigned long) data->tls_in_left);
return 1;
}
*in_data = data->tls_in;
*in_len = data->tls_in_len;
} else
data->tls_in_left = 0;
return 0;
}
int eap_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
int eap_type, int peap_version,
u8 id, u8 *in_data, size_t in_len,
u8 **out_data, size_t *out_len)
{
size_t len;
u8 *pos, *flags;
struct eap_hdr *resp;
WPA_ASSERT(data->tls_out_len == 0 || in_len == 0);
*out_len = 0;
if (data->tls_out_len == 0) {
/* No more data to send out - expect to receive more data from
* the AS. */
int res = eap_tls_data_reassemble(sm, data, &in_data, &in_len);
if (res < 0 || res == 1)
return res;
/* Full TLS message reassembled - continue handshake processing
*/
if (data->tls_out) {
/* This should not happen.. */
wpa_printf(MSG_INFO, "SSL: eap_tls_process_helper - "
"pending tls_out data even though "
"tls_out_len = 0");
free(data->tls_out);
WPA_ASSERT(data->tls_out == NULL);
}
data->tls_out = tls_connection_handshake(sm->ssl_ctx,
data->conn,
in_data, in_len,
&data->tls_out_len);
/* Clear reassembled input data (if the buffer was needed). */
data->tls_in_left = data->tls_in_total = data->tls_in_len = 0;
free(data->tls_in);
data->tls_in = NULL;
}
if (data->tls_out == NULL) {
data->tls_out_len = 0;
return -1;
}
if (data->tls_out_len == 0) {
/* TLS negotiation should now be complete since all other cases
* needing more that should have been catched above based on
* the TLS Message Length field. */
wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
free(data->tls_out);
data->tls_out = NULL;
return 1;
}
wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
"%lu bytes)",
(unsigned long) data->tls_out_len - data->tls_out_pos,
(unsigned long) data->tls_out_len);
resp = malloc(sizeof(struct eap_hdr) + 2 + 4 + data->tls_out_limit);
if (resp == NULL) {
*out_data = NULL;
return -1;
}
resp->code = EAP_CODE_RESPONSE;
resp->identifier = id;
pos = (u8 *) (resp + 1);
*pos++ = eap_type;
flags = pos++;
*flags = peap_version;
if (data->tls_out_pos == 0 &&
(data->tls_out_len > data->tls_out_limit ||
data->include_tls_length)) {
*flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
*pos++ = (data->tls_out_len >> 24) & 0xff;
*pos++ = (data->tls_out_len >> 16) & 0xff;
*pos++ = (data->tls_out_len >> 8) & 0xff;
*pos++ = data->tls_out_len & 0xff;
}
len = data->tls_out_len - data->tls_out_pos;
if (len > data->tls_out_limit) {
*flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
len = data->tls_out_limit;
wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments "
"will follow", (unsigned long) len);
}
memcpy(pos, &data->tls_out[data->tls_out_pos], len);
data->tls_out_pos += len;
*out_len = (pos - (u8 *) resp) + len;
resp->length = host_to_be16(*out_len);
*out_data = (u8 *) resp;
if (!(*flags & EAP_TLS_FLAGS_MORE_FRAGMENTS)) {
data->tls_out_len = 0;
data->tls_out_pos = 0;
free(data->tls_out);
data->tls_out = NULL;
}
return 0;
}
u8 * eap_tls_build_ack(struct eap_ssl_data *data, size_t *respDataLen, u8 id,
int eap_type, int peap_version)
{
struct eap_hdr *resp;
u8 *pos;
*respDataLen = sizeof(struct eap_hdr) + 2;
resp = malloc(*respDataLen);
if (resp == NULL)
return NULL;
wpa_printf(MSG_DEBUG, "SSL: Building ACK");
resp->code = EAP_CODE_RESPONSE;
resp->identifier = id;
resp->length = host_to_be16(*respDataLen);
pos = (u8 *) (resp + 1);
*pos++ = eap_type; /* Type */
*pos = peap_version; /* Flags */
return (u8 *) resp;
}
int eap_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data)
{
return tls_connection_shutdown(sm->ssl_ctx, data->conn);
}
int eap_tls_status(struct eap_sm *sm, struct eap_ssl_data *data, char *buf,
size_t buflen, int verbose)
{
char name[128];
int len = 0;
if (tls_get_cipher(sm->ssl_ctx, data->conn, name, sizeof(name)) == 0) {
len += snprintf(buf + len, buflen - len,
"EAP TLS cipher=%s\n", name);
}
return len;
}
