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freebsd-skq/contrib/wpa_supplicant/tlsv1_client.c

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Import of WPA supplicant 0.5.8
2007-07-11 15:48:36 +00:00
/*
* wpa_supplicant: TLSv1 client (RFC 2246)
* Copyright (c) 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 "base64.h"
#include "md5.h"
#include "sha1.h"
#include "crypto.h"
#include "tls.h"
#include "tlsv1_common.h"
#include "tlsv1_client.h"
#include "x509v3.h"
/* TODO:
* Support for a message fragmented across several records (RFC 2246, 6.2.1)
*/
struct tlsv1_client {
enum {
CLIENT_HELLO, SERVER_HELLO, SERVER_CERTIFICATE,
SERVER_KEY_EXCHANGE, SERVER_CERTIFICATE_REQUEST,
SERVER_HELLO_DONE, CLIENT_KEY_EXCHANGE, CHANGE_CIPHER_SPEC,
SERVER_CHANGE_CIPHER_SPEC, SERVER_FINISHED, ACK_FINISHED,
ESTABLISHED, FAILED
} state;
struct tlsv1_record_layer rl;
u8 session_id[TLS_SESSION_ID_MAX_LEN];
size_t session_id_len;
u8 client_random[TLS_RANDOM_LEN];
u8 server_random[TLS_RANDOM_LEN];
u8 master_secret[TLS_MASTER_SECRET_LEN];
u8 alert_level;
u8 alert_description;
unsigned int certificate_requested:1;
unsigned int session_resumed:1;
unsigned int ticket:1;
unsigned int ticket_key:1;
struct crypto_public_key *server_rsa_key;
struct crypto_hash *verify_md5_client;
struct crypto_hash *verify_sha1_client;
struct crypto_hash *verify_md5_server;
struct crypto_hash *verify_sha1_server;
struct crypto_hash *verify_md5_cert;
struct crypto_hash *verify_sha1_cert;
#define MAX_CIPHER_COUNT 30
u16 cipher_suites[MAX_CIPHER_COUNT];
size_t num_cipher_suites;
u16 prev_cipher_suite;
u8 *client_hello_ext;
size_t client_hello_ext_len;
/* The prime modulus used for Diffie-Hellman */
u8 *dh_p;
size_t dh_p_len;
/* The generator used for Diffie-Hellman */
u8 *dh_g;
size_t dh_g_len;
/* The server's Diffie-Hellman public value */
u8 *dh_ys;
size_t dh_ys_len;
struct x509_certificate *trusted_certs;
struct x509_certificate *client_cert;
struct crypto_private_key *client_key;
};
static int tls_derive_keys(struct tlsv1_client *conn,
const u8 *pre_master_secret,
size_t pre_master_secret_len);
static int tls_process_server_key_exchange(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len);
static int tls_process_certificate_request(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len);
static int tls_process_server_hello_done(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len);
static void tls_alert(struct tlsv1_client *conn, u8 level, u8 description)
{
conn->alert_level = level;
conn->alert_description = description;
}
static void tls_verify_hash_add(struct tlsv1_client *conn, const u8 *buf,
size_t len)
{
if (conn->verify_md5_client && conn->verify_sha1_client) {
crypto_hash_update(conn->verify_md5_client, buf, len);
crypto_hash_update(conn->verify_sha1_client, buf, len);
}
if (conn->verify_md5_server && conn->verify_sha1_server) {
crypto_hash_update(conn->verify_md5_server, buf, len);
crypto_hash_update(conn->verify_sha1_server, buf, len);
}
if (conn->verify_md5_cert && conn->verify_sha1_cert) {
crypto_hash_update(conn->verify_md5_cert, buf, len);
crypto_hash_update(conn->verify_sha1_cert, buf, len);
}
}
static u8 * tls_send_alert(struct tlsv1_client *conn,
u8 level, u8 description,
size_t *out_len)
{
u8 *alert, *pos, *length;
wpa_printf(MSG_DEBUG, "TLSv1: Send Alert(%d:%d)", level, description);
*out_len = 0;
alert = os_malloc(10);
if (alert == NULL)
return NULL;
pos = alert;
/* TLSPlaintext */
/* ContentType type */
*pos++ = TLS_CONTENT_TYPE_ALERT;
/* ProtocolVersion version */
WPA_PUT_BE16(pos, TLS_VERSION);
pos += 2;
/* uint16 length (to be filled) */
length = pos;
pos += 2;
/* opaque fragment[TLSPlaintext.length] */
/* Alert */
/* AlertLevel level */
*pos++ = level;
/* AlertDescription description */
*pos++ = description;
WPA_PUT_BE16(length, pos - length - 2);
*out_len = pos - alert;
return alert;
}
static u8 * tls_send_client_hello(struct tlsv1_client *conn,
size_t *out_len)
{
u8 *hello, *end, *pos, *hs_length, *hs_start, *rhdr;
struct os_time now;
size_t len, i;
wpa_printf(MSG_DEBUG, "TLSv1: Send ClientHello");
*out_len = 0;
os_get_time(&now);
WPA_PUT_BE32(conn->client_random, now.sec);
if (os_get_random(conn->client_random + 4, TLS_RANDOM_LEN - 4)) {
wpa_printf(MSG_ERROR, "TLSv1: Could not generate "
"client_random");
return NULL;
}
wpa_hexdump(MSG_MSGDUMP, "TLSv1: client_random",
conn->client_random, TLS_RANDOM_LEN);
len = 100 + conn->num_cipher_suites * 2 + conn->client_hello_ext_len;
hello = os_malloc(len);
if (hello == NULL)
return NULL;
end = hello + len;
rhdr = hello;
pos = rhdr + TLS_RECORD_HEADER_LEN;
/* opaque fragment[TLSPlaintext.length] */
/* Handshake */
hs_start = pos;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_CLIENT_HELLO;
/* uint24 length (to be filled) */
hs_length = pos;
pos += 3;
/* body - ClientHello */
/* ProtocolVersion client_version */
WPA_PUT_BE16(pos, TLS_VERSION);
pos += 2;
/* Random random: uint32 gmt_unix_time, opaque random_bytes */
os_memcpy(pos, conn->client_random, TLS_RANDOM_LEN);
pos += TLS_RANDOM_LEN;
/* SessionID session_id */
*pos++ = conn->session_id_len;
os_memcpy(pos, conn->session_id, conn->session_id_len);
pos += conn->session_id_len;
/* CipherSuite cipher_suites<2..2^16-1> */
WPA_PUT_BE16(pos, 2 * conn->num_cipher_suites);
pos += 2;
for (i = 0; i < conn->num_cipher_suites; i++) {
WPA_PUT_BE16(pos, conn->cipher_suites[i]);
pos += 2;
}
/* CompressionMethod compression_methods<1..2^8-1> */
*pos++ = 1;
*pos++ = TLS_COMPRESSION_NULL;
if (conn->client_hello_ext) {
os_memcpy(pos, conn->client_hello_ext,
conn->client_hello_ext_len);
pos += conn->client_hello_ext_len;
}
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
tls_verify_hash_add(conn, hs_start, pos - hs_start);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
rhdr, end - rhdr, pos - hs_start, out_len) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to create TLS record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(hello);
return NULL;
}
conn->state = SERVER_HELLO;
return hello;
}
static int tls_process_server_hello(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len)
{
const u8 *pos, *end;
size_t left, len, i;
u16 cipher_suite;
if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
"received content type 0x%x", ct);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
pos = in_data;
left = *in_len;
if (left < 4)
goto decode_error;
/* HandshakeType msg_type */
if (*pos != TLS_HANDSHAKE_TYPE_SERVER_HELLO) {
wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
"message %d (expected ServerHello)", *pos);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received ServerHello");
pos++;
/* uint24 length */
len = WPA_GET_BE24(pos);
pos += 3;
left -= 4;
if (len > left)
goto decode_error;
/* body - ServerHello */
wpa_hexdump(MSG_MSGDUMP, "TLSv1: ServerHello", pos, len);
end = pos + len;
/* ProtocolVersion server_version */
if (end - pos < 2)
goto decode_error;
if (WPA_GET_BE16(pos) != TLS_VERSION) {
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected protocol version in "
"ServerHello");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_PROTOCOL_VERSION);
return -1;
}
pos += 2;
/* Random random */
if (end - pos < TLS_RANDOM_LEN)
goto decode_error;
os_memcpy(conn->server_random, pos, TLS_RANDOM_LEN);
pos += TLS_RANDOM_LEN;
wpa_hexdump(MSG_MSGDUMP, "TLSv1: server_random",
conn->server_random, TLS_RANDOM_LEN);
/* SessionID session_id */
if (end - pos < 1)
goto decode_error;
if (end - pos < 1 + *pos || *pos > TLS_SESSION_ID_MAX_LEN)
goto decode_error;
if (conn->session_id_len && conn->session_id_len == *pos &&
os_memcmp(conn->session_id, pos + 1, conn->session_id_len) == 0) {
pos += 1 + conn->session_id_len;
wpa_printf(MSG_DEBUG, "TLSv1: Resuming old session");
conn->session_resumed = 1;
} else {
conn->session_id_len = *pos;
pos++;
os_memcpy(conn->session_id, pos, conn->session_id_len);
pos += conn->session_id_len;
}
wpa_hexdump(MSG_MSGDUMP, "TLSv1: session_id",
conn->session_id, conn->session_id_len);
/* CipherSuite cipher_suite */
if (end - pos < 2)
goto decode_error;
cipher_suite = WPA_GET_BE16(pos);
pos += 2;
for (i = 0; i < conn->num_cipher_suites; i++) {
if (cipher_suite == conn->cipher_suites[i])
break;
}
if (i == conn->num_cipher_suites) {
wpa_printf(MSG_INFO, "TLSv1: Server selected unexpected "
"cipher suite 0x%04x", cipher_suite);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_ILLEGAL_PARAMETER);
return -1;
}
if (conn->session_resumed && cipher_suite != conn->prev_cipher_suite) {
wpa_printf(MSG_DEBUG, "TLSv1: Server selected a different "
"cipher suite for a resumed connection (0x%04x != "
"0x%04x)", cipher_suite, conn->prev_cipher_suite);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_ILLEGAL_PARAMETER);
return -1;
}
if (tlsv1_record_set_cipher_suite(&conn->rl, cipher_suite) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to set CipherSuite for "
"record layer");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
conn->prev_cipher_suite = cipher_suite;
if (conn->session_resumed || conn->ticket_key)
tls_derive_keys(conn, NULL, 0);
/* CompressionMethod compression_method */
if (end - pos < 1)
goto decode_error;
if (*pos != TLS_COMPRESSION_NULL) {
wpa_printf(MSG_INFO, "TLSv1: Server selected unexpected "
"compression 0x%02x", *pos);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_ILLEGAL_PARAMETER);
return -1;
}
pos++;
if (end != pos) {
wpa_hexdump(MSG_DEBUG, "TLSv1: Unexpected extra data in the "
"end of ServerHello", pos, end - pos);
goto decode_error;
}
*in_len = end - in_data;
conn->state = (conn->session_resumed || conn->ticket) ?
SERVER_CHANGE_CIPHER_SPEC : SERVER_CERTIFICATE;
return 0;
decode_error:
wpa_printf(MSG_DEBUG, "TLSv1: Failed to decode ServerHello");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
static int tls_server_key_exchange_allowed(struct tlsv1_client *conn)
{
const struct tls_cipher_suite *suite;
/* RFC 2246, Section 7.4.3 */
suite = tls_get_cipher_suite(conn->rl.cipher_suite);
if (suite == NULL)
return 0;
switch (suite->key_exchange) {
case TLS_KEY_X_DHE_DSS:
case TLS_KEY_X_DHE_DSS_EXPORT:
case TLS_KEY_X_DHE_RSA:
case TLS_KEY_X_DHE_RSA_EXPORT:
case TLS_KEY_X_DH_anon_EXPORT:
case TLS_KEY_X_DH_anon:
return 1;
case TLS_KEY_X_RSA_EXPORT:
return 1 /* FIX: public key len > 512 bits */;
default:
return 0;
}
}
static int tls_process_certificate(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len)
{
const u8 *pos, *end;
size_t left, len, list_len, cert_len, idx;
u8 type;
struct x509_certificate *chain = NULL, *last = NULL, *cert;
int reason;
if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
"received content type 0x%x", ct);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
pos = in_data;
left = *in_len;
if (left < 4) {
wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate message "
"(len=%lu)", (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
type = *pos++;
len = WPA_GET_BE24(pos);
pos += 3;
left -= 4;
if (len > left) {
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected Certificate message "
"length (len=%lu != left=%lu)",
(unsigned long) len, (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
if (type == TLS_HANDSHAKE_TYPE_SERVER_KEY_EXCHANGE)
return tls_process_server_key_exchange(conn, ct, in_data,
in_len);
if (type == TLS_HANDSHAKE_TYPE_CERTIFICATE_REQUEST)
return tls_process_certificate_request(conn, ct, in_data,
in_len);
if (type == TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE)
return tls_process_server_hello_done(conn, ct, in_data,
in_len);
if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE) {
wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
"message %d (expected Certificate/"
"ServerKeyExchange/CertificateRequest/"
"ServerHelloDone)", type);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
wpa_printf(MSG_DEBUG,
"TLSv1: Received Certificate (certificate_list len %lu)",
(unsigned long) len);
/*
* opaque ASN.1Cert<2^24-1>;
*
* struct {
* ASN.1Cert certificate_list<1..2^24-1>;
* } Certificate;
*/
end = pos + len;
if (end - pos < 3) {
wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate "
"(left=%lu)", (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
list_len = WPA_GET_BE24(pos);
pos += 3;
if ((size_t) (end - pos) != list_len) {
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate_list "
"length (len=%lu left=%lu)",
(unsigned long) list_len,
(unsigned long) (end - pos));
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
idx = 0;
while (pos < end) {
if (end - pos < 3) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse "
"certificate_list");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECODE_ERROR);
x509_certificate_chain_free(chain);
return -1;
}
cert_len = WPA_GET_BE24(pos);
pos += 3;
if ((size_t) (end - pos) < cert_len) {
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate "
"length (len=%lu left=%lu)",
(unsigned long) cert_len,
(unsigned long) (end - pos));
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECODE_ERROR);
x509_certificate_chain_free(chain);
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Certificate %lu (len %lu)",
(unsigned long) idx, (unsigned long) cert_len);
if (idx == 0) {
crypto_public_key_free(conn->server_rsa_key);
if (tls_parse_cert(pos, cert_len,
&conn->server_rsa_key)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse "
"the certificate");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_BAD_CERTIFICATE);
x509_certificate_chain_free(chain);
return -1;
}
}
cert = x509_certificate_parse(pos, cert_len);
if (cert == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse "
"the certificate");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_BAD_CERTIFICATE);
x509_certificate_chain_free(chain);
return -1;
}
if (last == NULL)
chain = cert;
else
last->next = cert;
last = cert;
idx++;
pos += cert_len;
}
if (x509_certificate_chain_validate(conn->trusted_certs, chain,
&reason) < 0) {
int tls_reason;
wpa_printf(MSG_DEBUG, "TLSv1: Server certificate chain "
"validation failed (reason=%d)", reason);
switch (reason) {
case X509_VALIDATE_BAD_CERTIFICATE:
tls_reason = TLS_ALERT_BAD_CERTIFICATE;
break;
case X509_VALIDATE_UNSUPPORTED_CERTIFICATE:
tls_reason = TLS_ALERT_UNSUPPORTED_CERTIFICATE;
break;
case X509_VALIDATE_CERTIFICATE_REVOKED:
tls_reason = TLS_ALERT_CERTIFICATE_REVOKED;
break;
case X509_VALIDATE_CERTIFICATE_EXPIRED:
tls_reason = TLS_ALERT_CERTIFICATE_EXPIRED;
break;
case X509_VALIDATE_CERTIFICATE_UNKNOWN:
tls_reason = TLS_ALERT_CERTIFICATE_UNKNOWN;
break;
case X509_VALIDATE_UNKNOWN_CA:
tls_reason = TLS_ALERT_UNKNOWN_CA;
break;
default:
tls_reason = TLS_ALERT_BAD_CERTIFICATE;
break;
}
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, tls_reason);
x509_certificate_chain_free(chain);
return -1;
}
x509_certificate_chain_free(chain);
*in_len = end - in_data;
conn->state = SERVER_KEY_EXCHANGE;
return 0;
}
static void tlsv1_client_free_dh(struct tlsv1_client *conn)
{
os_free(conn->dh_p);
os_free(conn->dh_g);
os_free(conn->dh_ys);
conn->dh_p = conn->dh_g = conn->dh_ys = NULL;
}
static int tlsv1_process_diffie_hellman(struct tlsv1_client *conn,
const u8 *buf, size_t len)
{
const u8 *pos, *end;
tlsv1_client_free_dh(conn);
pos = buf;
end = buf + len;
if (end - pos < 3)
goto fail;
conn->dh_p_len = WPA_GET_BE16(pos);
pos += 2;
if (conn->dh_p_len == 0 || end - pos < (int) conn->dh_p_len)
goto fail;
conn->dh_p = os_malloc(conn->dh_p_len);
if (conn->dh_p == NULL)
goto fail;
os_memcpy(conn->dh_p, pos, conn->dh_p_len);
pos += conn->dh_p_len;
wpa_hexdump(MSG_DEBUG, "TLSv1: DH p (prime)",
conn->dh_p, conn->dh_p_len);
if (end - pos < 3)
goto fail;
conn->dh_g_len = WPA_GET_BE16(pos);
pos += 2;
if (conn->dh_g_len == 0 || end - pos < (int) conn->dh_g_len)
goto fail;
conn->dh_g = os_malloc(conn->dh_g_len);
if (conn->dh_g == NULL)
goto fail;
os_memcpy(conn->dh_g, pos, conn->dh_g_len);
pos += conn->dh_g_len;
wpa_hexdump(MSG_DEBUG, "TLSv1: DH g (generator)",
conn->dh_g, conn->dh_g_len);
if (conn->dh_g_len == 1 && conn->dh_g[0] < 2)
goto fail;
if (end - pos < 3)
goto fail;
conn->dh_ys_len = WPA_GET_BE16(pos);
pos += 2;
if (conn->dh_ys_len == 0 || end - pos < (int) conn->dh_ys_len)
goto fail;
conn->dh_ys = os_malloc(conn->dh_ys_len);
if (conn->dh_ys == NULL)
goto fail;
os_memcpy(conn->dh_ys, pos, conn->dh_ys_len);
pos += conn->dh_ys_len;
wpa_hexdump(MSG_DEBUG, "TLSv1: DH Ys (server's public value)",
conn->dh_ys, conn->dh_ys_len);
return 0;
fail:
tlsv1_client_free_dh(conn);
return -1;
}
static int tls_process_server_key_exchange(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len)
{
const u8 *pos, *end;
size_t left, len;
u8 type;
const struct tls_cipher_suite *suite;
if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
"received content type 0x%x", ct);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
pos = in_data;
left = *in_len;
if (left < 4) {
wpa_printf(MSG_DEBUG, "TLSv1: Too short ServerKeyExchange "
"(Left=%lu)", (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
type = *pos++;
len = WPA_GET_BE24(pos);
pos += 3;
left -= 4;
if (len > left) {
wpa_printf(MSG_DEBUG, "TLSv1: Mismatch in ServerKeyExchange "
"length (len=%lu != left=%lu)",
(unsigned long) len, (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
end = pos + len;
if (type == TLS_HANDSHAKE_TYPE_CERTIFICATE_REQUEST)
return tls_process_certificate_request(conn, ct, in_data,
in_len);
if (type == TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE)
return tls_process_server_hello_done(conn, ct, in_data,
in_len);
if (type != TLS_HANDSHAKE_TYPE_SERVER_KEY_EXCHANGE) {
wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
"message %d (expected ServerKeyExchange/"
"CertificateRequest/ServerHelloDone)", type);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received ServerKeyExchange");
if (!tls_server_key_exchange_allowed(conn)) {
wpa_printf(MSG_DEBUG, "TLSv1: ServerKeyExchange not allowed "
"with the selected cipher suite");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
wpa_hexdump(MSG_DEBUG, "TLSv1: ServerKeyExchange", pos, len);
suite = tls_get_cipher_suite(conn->rl.cipher_suite);
if (suite && suite->key_exchange == TLS_KEY_X_DH_anon) {
if (tlsv1_process_diffie_hellman(conn, pos, len) < 0) {
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECODE_ERROR);
return -1;
}
} else {
wpa_printf(MSG_DEBUG, "TLSv1: UnexpectedServerKeyExchange");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
*in_len = end - in_data;
conn->state = SERVER_CERTIFICATE_REQUEST;
return 0;
}
static int tls_process_certificate_request(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len)
{
const u8 *pos, *end;
size_t left, len;
u8 type;
if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
"received content type 0x%x", ct);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
pos = in_data;
left = *in_len;
if (left < 4) {
wpa_printf(MSG_DEBUG, "TLSv1: Too short CertificateRequest "
"(left=%lu)", (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
type = *pos++;
len = WPA_GET_BE24(pos);
pos += 3;
left -= 4;
if (len > left) {
wpa_printf(MSG_DEBUG, "TLSv1: Mismatch in CertificateRequest "
"length (len=%lu != left=%lu)",
(unsigned long) len, (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
end = pos + len;
if (type == TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE)
return tls_process_server_hello_done(conn, ct, in_data,
in_len);
if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE_REQUEST) {
wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
"message %d (expected CertificateRequest/"
"ServerHelloDone)", type);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received CertificateRequest");
conn->certificate_requested = 1;
*in_len = end - in_data;
conn->state = SERVER_HELLO_DONE;
return 0;
}
static int tls_process_server_hello_done(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len)
{
const u8 *pos, *end;
size_t left, len;
u8 type;
if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
"received content type 0x%x", ct);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
pos = in_data;
left = *in_len;
if (left < 4) {
wpa_printf(MSG_DEBUG, "TLSv1: Too short ServerHelloDone "
"(left=%lu)", (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
type = *pos++;
len = WPA_GET_BE24(pos);
pos += 3;
left -= 4;
if (len > left) {
wpa_printf(MSG_DEBUG, "TLSv1: Mismatch in ServerHelloDone "
"length (len=%lu != left=%lu)",
(unsigned long) len, (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
end = pos + len;
if (type != TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE) {
wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
"message %d (expected ServerHelloDone)", type);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received ServerHelloDone");
*in_len = end - in_data;
conn->state = CLIENT_KEY_EXCHANGE;
return 0;
}
static int tls_process_server_change_cipher_spec(struct tlsv1_client *conn,
u8 ct, const u8 *in_data,
size_t *in_len)
{
const u8 *pos;
size_t left;
if (ct != TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; "
"received content type 0x%x", ct);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
pos = in_data;
left = *in_len;
if (left < 1) {
wpa_printf(MSG_DEBUG, "TLSv1: Too short ChangeCipherSpec");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_DECODE_ERROR);
return -1;
}
if (*pos != TLS_CHANGE_CIPHER_SPEC) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; "
"received data 0x%x", *pos);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received ChangeCipherSpec");
if (tlsv1_record_change_read_cipher(&conn->rl) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to change read cipher "
"for record layer");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
*in_len = pos + 1 - in_data;
conn->state = SERVER_FINISHED;
return 0;
}
static int tls_process_server_finished(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len)
{
const u8 *pos, *end;
size_t left, len, hlen;
u8 verify_data[TLS_VERIFY_DATA_LEN];
u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN];
if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; "
"received content type 0x%x", ct);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
pos = in_data;
left = *in_len;
if (left < 4) {
wpa_printf(MSG_DEBUG, "TLSv1: Too short record (left=%lu) for "
"Finished",
(unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECODE_ERROR);
return -1;
}
if (pos[0] != TLS_HANDSHAKE_TYPE_FINISHED) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; received "
"type 0x%x", pos[0]);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
len = WPA_GET_BE24(pos + 1);
pos += 4;
left -= 4;
if (len > left) {
wpa_printf(MSG_DEBUG, "TLSv1: Too short buffer for Finished "
"(len=%lu > left=%lu)",
(unsigned long) len, (unsigned long) left);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECODE_ERROR);
return -1;
}
end = pos + len;
if (len != TLS_VERIFY_DATA_LEN) {
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected verify_data length "
"in Finished: %lu (expected %d)",
(unsigned long) len, TLS_VERIFY_DATA_LEN);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECODE_ERROR);
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "TLSv1: verify_data in Finished",
pos, TLS_VERIFY_DATA_LEN);
hlen = MD5_MAC_LEN;
if (conn->verify_md5_server == NULL ||
crypto_hash_finish(conn->verify_md5_server, hash, &hlen) < 0) {
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
conn->verify_md5_server = NULL;
crypto_hash_finish(conn->verify_sha1_server, NULL, NULL);
conn->verify_sha1_server = NULL;
return -1;
}
conn->verify_md5_server = NULL;
hlen = SHA1_MAC_LEN;
if (conn->verify_sha1_server == NULL ||
crypto_hash_finish(conn->verify_sha1_server, hash + MD5_MAC_LEN,
&hlen) < 0) {
conn->verify_sha1_server = NULL;
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
conn->verify_sha1_server = NULL;
if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
"server finished", hash, MD5_MAC_LEN + SHA1_MAC_LEN,
verify_data, TLS_VERIFY_DATA_LEN)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive verify_data");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECRYPT_ERROR);
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (server)",
verify_data, TLS_VERIFY_DATA_LEN);
if (os_memcmp(pos, verify_data, TLS_VERIFY_DATA_LEN) != 0) {
wpa_printf(MSG_INFO, "TLSv1: Mismatch in verify_data");
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received Finished");
*in_len = end - in_data;
conn->state = (conn->session_resumed || conn->ticket) ?
CHANGE_CIPHER_SPEC : ACK_FINISHED;
return 0;
}
static int tls_derive_pre_master_secret(u8 *pre_master_secret)
{
WPA_PUT_BE16(pre_master_secret, TLS_VERSION);
if (os_get_random(pre_master_secret + 2,
TLS_PRE_MASTER_SECRET_LEN - 2))
return -1;
return 0;
}
static int tls_derive_keys(struct tlsv1_client *conn,
const u8 *pre_master_secret,
size_t pre_master_secret_len)
{
u8 seed[2 * TLS_RANDOM_LEN];
u8 key_block[TLS_MAX_KEY_BLOCK_LEN];
u8 *pos;
size_t key_block_len;
if (pre_master_secret) {
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: pre_master_secret",
pre_master_secret, pre_master_secret_len);
os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
TLS_RANDOM_LEN);
if (tls_prf(pre_master_secret, pre_master_secret_len,
"master secret", seed, 2 * TLS_RANDOM_LEN,
conn->master_secret, TLS_MASTER_SECRET_LEN)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive "
"master_secret");
return -1;
}
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret",
conn->master_secret, TLS_MASTER_SECRET_LEN);
}
os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random, TLS_RANDOM_LEN);
key_block_len = 2 * (conn->rl.hash_size + conn->rl.key_material_len +
conn->rl.iv_size);
if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
"key expansion", seed, 2 * TLS_RANDOM_LEN,
key_block, key_block_len)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive key_block");
return -1;
}
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: key_block",
key_block, key_block_len);
pos = key_block;
/* client_write_MAC_secret */
os_memcpy(conn->rl.write_mac_secret, pos, conn->rl.hash_size);
pos += conn->rl.hash_size;
/* server_write_MAC_secret */
os_memcpy(conn->rl.read_mac_secret, pos, conn->rl.hash_size);
pos += conn->rl.hash_size;
/* client_write_key */
os_memcpy(conn->rl.write_key, pos, conn->rl.key_material_len);
pos += conn->rl.key_material_len;
/* server_write_key */
os_memcpy(conn->rl.read_key, pos, conn->rl.key_material_len);
pos += conn->rl.key_material_len;
/* client_write_IV */
os_memcpy(conn->rl.write_iv, pos, conn->rl.iv_size);
pos += conn->rl.iv_size;
/* server_write_IV */
os_memcpy(conn->rl.read_iv, pos, conn->rl.iv_size);
pos += conn->rl.iv_size;
return 0;
}
static int tls_write_client_certificate(struct tlsv1_client *conn,
u8 **msgpos, u8 *end)
{
u8 *pos, *rhdr, *hs_start, *hs_length, *cert_start;
size_t rlen;
struct x509_certificate *cert;
pos = *msgpos;
wpa_printf(MSG_DEBUG, "TLSv1: Send Certificate");
rhdr = pos;
pos += TLS_RECORD_HEADER_LEN;
/* opaque fragment[TLSPlaintext.length] */
/* Handshake */
hs_start = pos;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE;
/* uint24 length (to be filled) */
hs_length = pos;
pos += 3;
/* body - Certificate */
/* uint24 length (to be filled) */
cert_start = pos;
pos += 3;
cert = conn->client_cert;
while (cert) {
if (pos + 3 + cert->cert_len > end) {
wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space "
"for Certificate (cert_len=%lu left=%lu)",
(unsigned long) cert->cert_len,
(unsigned long) (end - pos));
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
WPA_PUT_BE24(pos, cert->cert_len);
pos += 3;
os_memcpy(pos, cert->cert_start, cert->cert_len);
pos += cert->cert_len;
if (x509_certificate_self_signed(cert))
break;
cert = x509_certificate_get_subject(conn->trusted_certs,
&cert->issuer);
}
if (cert == conn->client_cert || cert == NULL) {
/*
* Client was not configured with all the needed certificates
* to form a full certificate chain. The server may fail to
* validate the chain unless it is configured with all the
* missing CA certificates.
*/
wpa_printf(MSG_DEBUG, "TLSv1: Full client certificate chain "
"not configured - validation may fail");
}
WPA_PUT_BE24(cert_start, pos - cert_start - 3);
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos = rhdr + rlen;
tls_verify_hash_add(conn, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}
static int tlsv1_key_x_anon_dh(struct tlsv1_client *conn, u8 **pos, u8 *end)
{
#ifdef EAP_FAST
/* ClientDiffieHellmanPublic */
u8 *csecret, *csecret_start, *dh_yc, *shared;
size_t csecret_len, dh_yc_len, shared_len;
csecret_len = conn->dh_p_len;
csecret = os_malloc(csecret_len);
if (csecret == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
"memory for Yc (Diffie-Hellman)");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
if (os_get_random(csecret, csecret_len)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random "
"data for Diffie-Hellman");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(csecret);
return -1;
}
if (os_memcmp(csecret, conn->dh_p, csecret_len) > 0)
csecret[0] = 0; /* make sure Yc < p */
csecret_start = csecret;
while (csecret_len > 1 && *csecret_start == 0) {
csecret_start++;
csecret_len--;
}
wpa_hexdump_key(MSG_DEBUG, "TLSv1: DH client's secret value",
csecret_start, csecret_len);
/* Yc = g^csecret mod p */
dh_yc_len = conn->dh_p_len;
dh_yc = os_malloc(dh_yc_len);
if (dh_yc == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
"memory for Diffie-Hellman");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(csecret);
return -1;
}
crypto_mod_exp(conn->dh_g, conn->dh_g_len,
csecret_start, csecret_len,
conn->dh_p, conn->dh_p_len,
dh_yc, &dh_yc_len);
wpa_hexdump(MSG_DEBUG, "TLSv1: DH Yc (client's public value)",
dh_yc, dh_yc_len);
WPA_PUT_BE16(*pos, dh_yc_len);
*pos += 2;
if (*pos + dh_yc_len > end) {
wpa_printf(MSG_DEBUG, "TLSv1: Not enough room in the "
"message buffer for Yc");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(csecret);
os_free(dh_yc);
return -1;
}
os_memcpy(*pos, dh_yc, dh_yc_len);
*pos += dh_yc_len;
os_free(dh_yc);
shared_len = conn->dh_p_len;
shared = os_malloc(shared_len);
if (shared == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Could not allocate memory for "
"DH");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(csecret);
return -1;
}
/* shared = Ys^csecret mod p */
crypto_mod_exp(conn->dh_ys, conn->dh_ys_len,
csecret_start, csecret_len,
conn->dh_p, conn->dh_p_len,
shared, &shared_len);
wpa_hexdump_key(MSG_DEBUG, "TLSv1: Shared secret from DH key exchange",
shared, shared_len);
os_memset(csecret_start, 0, csecret_len);
os_free(csecret);
if (tls_derive_keys(conn, shared, shared_len)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(shared);
return -1;
}
os_memset(shared, 0, shared_len);
os_free(shared);
tlsv1_client_free_dh(conn);
return 0;
#else /* EAP_FAST */
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, TLS_ALERT_INTERNAL_ERROR);
return -1;
#endif /* EAP_FAST */
}
static int tlsv1_key_x_rsa(struct tlsv1_client *conn, u8 **pos, u8 *end)
{
u8 pre_master_secret[TLS_PRE_MASTER_SECRET_LEN];
size_t clen;
int res;
if (tls_derive_pre_master_secret(pre_master_secret) < 0 ||
tls_derive_keys(conn, pre_master_secret,
TLS_PRE_MASTER_SECRET_LEN)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
/* EncryptedPreMasterSecret */
if (conn->server_rsa_key == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: No server RSA key to "
"use for encrypting pre-master secret");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
/* RSA encrypted value is encoded with PKCS #1 v1.5 block type 2. */
*pos += 2;
clen = end - *pos;
res = crypto_public_key_encrypt_pkcs1_v15(
conn->server_rsa_key,
pre_master_secret, TLS_PRE_MASTER_SECRET_LEN,
*pos, &clen);
os_memset(pre_master_secret, 0, TLS_PRE_MASTER_SECRET_LEN);
if (res < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: RSA encryption failed");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
WPA_PUT_BE16(*pos - 2, clen);
wpa_hexdump(MSG_MSGDUMP, "TLSv1: Encrypted pre_master_secret",
*pos, clen);
*pos += clen;
return 0;
}
static int tls_write_client_key_exchange(struct tlsv1_client *conn,
u8 **msgpos, u8 *end)
{
u8 *pos, *rhdr, *hs_start, *hs_length;
size_t rlen;
tls_key_exchange keyx;
const struct tls_cipher_suite *suite;
suite = tls_get_cipher_suite(conn->rl.cipher_suite);
if (suite == NULL)
keyx = TLS_KEY_X_NULL;
else
keyx = suite->key_exchange;
pos = *msgpos;
wpa_printf(MSG_DEBUG, "TLSv1: Send ClientKeyExchange");
rhdr = pos;
pos += TLS_RECORD_HEADER_LEN;
/* opaque fragment[TLSPlaintext.length] */
/* Handshake */
hs_start = pos;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE;
/* uint24 length (to be filled) */
hs_length = pos;
pos += 3;
/* body - ClientKeyExchange */
if (keyx == TLS_KEY_X_DH_anon) {
if (tlsv1_key_x_anon_dh(conn, &pos, end) < 0)
return -1;
} else {
if (tlsv1_key_x_rsa(conn, &pos, end) < 0)
return -1;
}
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos = rhdr + rlen;
tls_verify_hash_add(conn, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}
static int tls_write_client_certificate_verify(struct tlsv1_client *conn,
u8 **msgpos, u8 *end)
{
u8 *pos, *rhdr, *hs_start, *hs_length, *signed_start;
size_t rlen, hlen, clen;
u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN], *hpos;
enum { SIGN_ALG_RSA, SIGN_ALG_DSA } alg = SIGN_ALG_RSA;
pos = *msgpos;
wpa_printf(MSG_DEBUG, "TLSv1: Send CertificateVerify");
rhdr = pos;
pos += TLS_RECORD_HEADER_LEN;
/* Handshake */
hs_start = pos;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE_VERIFY;
/* uint24 length (to be filled) */
hs_length = pos;
pos += 3;
/*
* RFC 2246: 7.4.3 and 7.4.8:
* Signature signature
*
* RSA:
* digitally-signed struct {
* opaque md5_hash[16];
* opaque sha_hash[20];
* };
*
* DSA:
* digitally-signed struct {
* opaque sha_hash[20];
* };
*
* The hash values are calculated over all handshake messages sent or
* received starting at ClientHello up to, but not including, this
* CertificateVerify message, including the type and length fields of
* the handshake messages.
*/
hpos = hash;
if (alg == SIGN_ALG_RSA) {
hlen = MD5_MAC_LEN;
if (conn->verify_md5_cert == NULL ||
crypto_hash_finish(conn->verify_md5_cert, hpos, &hlen) < 0)
{
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
conn->verify_md5_cert = NULL;
crypto_hash_finish(conn->verify_sha1_cert, NULL, NULL);
conn->verify_sha1_cert = NULL;
return -1;
}
hpos += MD5_MAC_LEN;
} else
crypto_hash_finish(conn->verify_md5_cert, NULL, NULL);
conn->verify_md5_cert = NULL;
hlen = SHA1_MAC_LEN;
if (conn->verify_sha1_cert == NULL ||
crypto_hash_finish(conn->verify_sha1_cert, hpos, &hlen) < 0) {
conn->verify_sha1_cert = NULL;
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
conn->verify_sha1_cert = NULL;
if (alg == SIGN_ALG_RSA)
hlen += MD5_MAC_LEN;
wpa_hexdump(MSG_MSGDUMP, "TLSv1: CertificateVerify hash", hash, hlen);
/*
* RFC 2246, 4.7:
* In digital signing, one-way hash functions are used as input for a
* signing algorithm. A digitally-signed element is encoded as an
* opaque vector <0..2^16-1>, where the length is specified by the
* signing algorithm and key.
*
* In RSA signing, a 36-byte structure of two hashes (one SHA and one
* MD5) is signed (encrypted with the private key). It is encoded with
* PKCS #1 block type 0 or type 1 as described in [PKCS1].
*/
signed_start = pos; /* length to be filled */
pos += 2;
clen = end - pos;
if (crypto_private_key_sign_pkcs1(conn->client_key, hash, hlen,
pos, &clen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to sign hash (PKCS #1)");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
WPA_PUT_BE16(signed_start, clen);
pos += clen;
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos = rhdr + rlen;
tls_verify_hash_add(conn, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}
static int tls_write_client_change_cipher_spec(struct tlsv1_client *conn,
u8 **msgpos, u8 *end)
{
u8 *pos, *rhdr;
size_t rlen;
pos = *msgpos;
wpa_printf(MSG_DEBUG, "TLSv1: Send ChangeCipherSpec");
rhdr = pos;
pos += TLS_RECORD_HEADER_LEN;
*pos = TLS_CHANGE_CIPHER_SPEC;
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC,
rhdr, end - rhdr, 1, &rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
if (tlsv1_record_change_write_cipher(&conn->rl) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to set write cipher for "
"record layer");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
*msgpos = rhdr + rlen;
return 0;
}
static int tls_write_client_finished(struct tlsv1_client *conn,
u8 **msgpos, u8 *end)
{
u8 *pos, *rhdr, *hs_start, *hs_length;
size_t rlen, hlen;
u8 verify_data[TLS_VERIFY_DATA_LEN];
u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN];
pos = *msgpos;
wpa_printf(MSG_DEBUG, "TLSv1: Send Finished");
/* Encrypted Handshake Message: Finished */
hlen = MD5_MAC_LEN;
if (conn->verify_md5_client == NULL ||
crypto_hash_finish(conn->verify_md5_client, hash, &hlen) < 0) {
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
conn->verify_md5_client = NULL;
crypto_hash_finish(conn->verify_sha1_client, NULL, NULL);
conn->verify_sha1_client = NULL;
return -1;
}
conn->verify_md5_client = NULL;
hlen = SHA1_MAC_LEN;
if (conn->verify_sha1_client == NULL ||
crypto_hash_finish(conn->verify_sha1_client, hash + MD5_MAC_LEN,
&hlen) < 0) {
conn->verify_sha1_client = NULL;
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
conn->verify_sha1_client = NULL;
if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
"client finished", hash, MD5_MAC_LEN + SHA1_MAC_LEN,
verify_data, TLS_VERIFY_DATA_LEN)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate verify_data");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (client)",
verify_data, TLS_VERIFY_DATA_LEN);
rhdr = pos;
pos += TLS_RECORD_HEADER_LEN;
/* Handshake */
hs_start = pos;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_FINISHED;
/* uint24 length (to be filled) */
hs_length = pos;
pos += 3;
os_memcpy(pos, verify_data, TLS_VERIFY_DATA_LEN);
pos += TLS_VERIFY_DATA_LEN;
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
tls_verify_hash_add(conn, hs_start, pos - hs_start);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
rhdr, end - rhdr, pos - hs_start, &rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos = rhdr + rlen;
*msgpos = pos;
return 0;
}
static size_t tls_client_cert_chain_der_len(struct tlsv1_client *conn)
{
size_t len = 0;
struct x509_certificate *cert;
cert = conn->client_cert;
while (cert) {
len += 3 + cert->cert_len;
if (x509_certificate_self_signed(cert))
break;
cert = x509_certificate_get_subject(conn->trusted_certs,
&cert->issuer);
}
return len;
}
static u8 * tls_send_client_key_exchange(struct tlsv1_client *conn,
size_t *out_len)
{
u8 *msg, *end, *pos;
size_t msglen;
*out_len = 0;
msglen = 1000;
if (conn->certificate_requested)
msglen += tls_client_cert_chain_der_len(conn);
msg = os_malloc(msglen);
if (msg == NULL)
return NULL;
pos = msg;
end = msg + msglen;
if (conn->certificate_requested) {
if (tls_write_client_certificate(conn, &pos, end) < 0) {
os_free(msg);
return NULL;
}
}
if (tls_write_client_key_exchange(conn, &pos, end) < 0 ||
(conn->certificate_requested && conn->client_key &&
tls_write_client_certificate_verify(conn, &pos, end) < 0) ||
tls_write_client_change_cipher_spec(conn, &pos, end) < 0 ||
tls_write_client_finished(conn, &pos, end) < 0) {
os_free(msg);
return NULL;
}
*out_len = pos - msg;
conn->state = SERVER_CHANGE_CIPHER_SPEC;
return msg;
}
static u8 * tls_send_change_cipher_spec(struct tlsv1_client *conn,
size_t *out_len)
{
u8 *msg, *end, *pos;
*out_len = 0;
msg = os_malloc(1000);
if (msg == NULL)
return NULL;
pos = msg;
end = msg + 1000;
if (tls_write_client_change_cipher_spec(conn, &pos, end) < 0 ||
tls_write_client_finished(conn, &pos, end) < 0) {
os_free(msg);
return NULL;
}
*out_len = pos - msg;
wpa_printf(MSG_DEBUG, "TLSv1: Session resumption completed "
"successfully");
conn->state = ESTABLISHED;
return msg;
}
static int tlsv1_client_process_handshake(struct tlsv1_client *conn, u8 ct,
const u8 *buf, size_t *len)
{
if (ct == TLS_CONTENT_TYPE_HANDSHAKE && *len >= 4 &&
buf[0] == TLS_HANDSHAKE_TYPE_HELLO_REQUEST) {
size_t hr_len = WPA_GET_BE24(buf + 1);
if (hr_len > *len - 4) {
wpa_printf(MSG_DEBUG, "TLSv1: HelloRequest underflow");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECODE_ERROR);
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Ignored HelloRequest");
*len = 4 + hr_len;
return 0;
}
switch (conn->state) {
case SERVER_HELLO:
if (tls_process_server_hello(conn, ct, buf, len))
return -1;
break;
case SERVER_CERTIFICATE:
if (tls_process_certificate(conn, ct, buf, len))
return -1;
break;
case SERVER_KEY_EXCHANGE:
if (tls_process_server_key_exchange(conn, ct, buf, len))
return -1;
break;
case SERVER_CERTIFICATE_REQUEST:
if (tls_process_certificate_request(conn, ct, buf, len))
return -1;
break;
case SERVER_HELLO_DONE:
if (tls_process_server_hello_done(conn, ct, buf, len))
return -1;
break;
case SERVER_CHANGE_CIPHER_SPEC:
if (tls_process_server_change_cipher_spec(conn, ct, buf, len))
return -1;
break;
case SERVER_FINISHED:
if (tls_process_server_finished(conn, ct, buf, len))
return -1;
break;
default:
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d "
"while processing received message",
conn->state);
return -1;
}
if (ct == TLS_CONTENT_TYPE_HANDSHAKE)
tls_verify_hash_add(conn, buf, *len);
return 0;
}
/**
* tlsv1_client_handshake - Process TLS handshake
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @in_data: Input data from TLS peer
* @in_len: Input data length
* @out_len: Length of the output buffer.
* Returns: Pointer to output data, %NULL on failure
*/
u8 * tlsv1_client_handshake(struct tlsv1_client *conn,
const u8 *in_data, size_t in_len,
size_t *out_len)
{
const u8 *pos, *end;
u8 *msg = NULL, *in_msg, *in_pos, *in_end, alert, ct;
size_t in_msg_len;
if (conn->state == CLIENT_HELLO) {
if (in_len)
return NULL;
return tls_send_client_hello(conn, out_len);
}
if (in_data == NULL || in_len == 0)
return NULL;
pos = in_data;
end = in_data + in_len;
in_msg = os_malloc(in_len);
if (in_msg == NULL)
return NULL;
/* Each received packet may include multiple records */
while (pos < end) {
in_msg_len = in_len;
if (tlsv1_record_receive(&conn->rl, pos, end - pos,
in_msg, &in_msg_len, &alert)) {
wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
"record failed");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
goto failed;
}
ct = pos[0];
in_pos = in_msg;
in_end = in_msg + in_msg_len;
/* Each received record may include multiple messages of the
* same ContentType. */
while (in_pos < in_end) {
in_msg_len = in_end - in_pos;
if (tlsv1_client_process_handshake(conn, ct, in_pos,
&in_msg_len) < 0)
goto failed;
in_pos += in_msg_len;
}
pos += TLS_RECORD_HEADER_LEN + WPA_GET_BE16(pos + 3);
}
os_free(in_msg);
in_msg = NULL;
switch (conn->state) {
case CLIENT_KEY_EXCHANGE:
msg = tls_send_client_key_exchange(conn, out_len);
break;
case CHANGE_CIPHER_SPEC:
msg = tls_send_change_cipher_spec(conn, out_len);
break;
case ACK_FINISHED:
wpa_printf(MSG_DEBUG, "TLSv1: Handshake completed "
"successfully");
conn->state = ESTABLISHED;
/* Need to return something to get final TLS ACK. */
msg = os_malloc(1);
*out_len = 0;
break;
default:
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d while "
"generating reply", conn->state);
break;
}
failed:
os_free(in_msg);
if (conn->alert_level) {
conn->state = FAILED;
os_free(msg);
msg = tls_send_alert(conn, conn->alert_level,
conn->alert_description, out_len);
}
return msg;
}
/**
* tlsv1_client_encrypt - Encrypt data into TLS tunnel
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @in_data: Pointer to plaintext data to be encrypted
* @in_len: Input buffer length
* @out_data: Pointer to output buffer (encrypted TLS data)
* @out_len: Maximum out_data length
* Returns: Number of bytes written to out_data, -1 on failure
*
* This function is used after TLS handshake has been completed successfully to
* send data in the encrypted tunnel.
*/
int tlsv1_client_encrypt(struct tlsv1_client *conn,
const u8 *in_data, size_t in_len,
u8 *out_data, size_t out_len)
{
size_t rlen;
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Plaintext AppData",
in_data, in_len);
os_memcpy(out_data + TLS_RECORD_HEADER_LEN, in_data, in_len);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
out_data, out_len, in_len, &rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
return rlen;
}
/**
* tlsv1_client_decrypt - Decrypt data from TLS tunnel
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @in_data: Pointer to input buffer (encrypted TLS data)
* @in_len: Input buffer length
* @out_data: Pointer to output buffer (decrypted data from TLS tunnel)
* @out_len: Maximum out_data length
* Returns: Number of bytes written to out_data, -1 on failure
*
* This function is used after TLS handshake has been completed successfully to
* receive data from the encrypted tunnel.
*/
int tlsv1_client_decrypt(struct tlsv1_client *conn,
const u8 *in_data, size_t in_len,
u8 *out_data, size_t out_len)
{
const u8 *in_end, *pos;
int res;
u8 alert, *out_end, *out_pos;
size_t olen;
pos = in_data;
in_end = in_data + in_len;
out_pos = out_data;
out_end = out_data + out_len;
while (pos < in_end) {
if (pos[0] != TLS_CONTENT_TYPE_APPLICATION_DATA) {
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
"0x%x", pos[0]);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_UNEXPECTED_MESSAGE);
return -1;
}
olen = out_end - out_pos;
res = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
out_pos, &olen, &alert);
if (res < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
"failed");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
return -1;
}
out_pos += olen;
if (out_pos > out_end) {
wpa_printf(MSG_DEBUG, "TLSv1: Buffer not large enough "
"for processing the received record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos += TLS_RECORD_HEADER_LEN + WPA_GET_BE16(pos + 3);
}
return out_pos - out_data;
}
/**
* tlsv1_client_global_init - Initialize TLSv1 client
* Returns: 0 on success, -1 on failure
*
* This function must be called before using any other TLSv1 client functions.
*/
int tlsv1_client_global_init(void)
{
return crypto_global_init();
}
/**
* tlsv1_client_global_deinit - Deinitialize TLSv1 client
*
* This function can be used to deinitialize the TLSv1 client that was
* initialized by calling tlsv1_client_global_init(). No TLSv1 client functions
* can be called after this before calling tlsv1_client_global_init() again.
*/
void tlsv1_client_global_deinit(void)
{
crypto_global_deinit();
}
static void tlsv1_client_free_verify_hashes(struct tlsv1_client *conn)
{
crypto_hash_finish(conn->verify_md5_client, NULL, NULL);
crypto_hash_finish(conn->verify_md5_server, NULL, NULL);
crypto_hash_finish(conn->verify_md5_cert, NULL, NULL);
crypto_hash_finish(conn->verify_sha1_client, NULL, NULL);
crypto_hash_finish(conn->verify_sha1_server, NULL, NULL);
crypto_hash_finish(conn->verify_sha1_cert, NULL, NULL);
conn->verify_md5_client = NULL;
conn->verify_md5_server = NULL;
conn->verify_md5_cert = NULL;
conn->verify_sha1_client = NULL;
conn->verify_sha1_server = NULL;
conn->verify_sha1_cert = NULL;
}
static int tlsv1_client_init_verify_hashes(struct tlsv1_client *conn)
{
conn->verify_md5_client = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL,
0);
conn->verify_md5_server = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL,
0);
conn->verify_md5_cert = crypto_hash_init(CRYPTO_HASH_ALG_MD5, NULL, 0);
conn->verify_sha1_client = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL,
0);
conn->verify_sha1_server = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL,
0);
conn->verify_sha1_cert = crypto_hash_init(CRYPTO_HASH_ALG_SHA1, NULL,
0);
if (conn->verify_md5_client == NULL ||
conn->verify_md5_server == NULL ||
conn->verify_md5_cert == NULL ||
conn->verify_sha1_client == NULL ||
conn->verify_sha1_server == NULL ||
conn->verify_sha1_cert == NULL) {
tlsv1_client_free_verify_hashes(conn);
return -1;
}
return 0;
}
/**
* tlsv1_client_init - Initialize TLSv1 client connection
* Returns: Pointer to TLSv1 client connection data or %NULL on failure
*/
struct tlsv1_client * tlsv1_client_init(void)
{
struct tlsv1_client *conn;
size_t count;
u16 *suites;
conn = os_zalloc(sizeof(*conn));
if (conn == NULL)
return NULL;
conn->state = CLIENT_HELLO;
if (tlsv1_client_init_verify_hashes(conn) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to initialize verify "
"hash");
os_free(conn);
return NULL;
}
count = 0;
suites = conn->cipher_suites;
#ifndef CONFIG_CRYPTO_INTERNAL
suites[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
#endif /* CONFIG_CRYPTO_INTERNAL */
suites[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
suites[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
suites[count++] = TLS_RSA_WITH_RC4_128_SHA;
suites[count++] = TLS_RSA_WITH_RC4_128_MD5;
conn->num_cipher_suites = count;
return conn;
}
/**
* tlsv1_client_deinit - Deinitialize TLSv1 client connection
* @conn: TLSv1 client connection data from tlsv1_client_init()
*/
void tlsv1_client_deinit(struct tlsv1_client *conn)
{
crypto_public_key_free(conn->server_rsa_key);
tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
tlsv1_record_change_write_cipher(&conn->rl);
tlsv1_record_change_read_cipher(&conn->rl);
tlsv1_client_free_verify_hashes(conn);
os_free(conn->client_hello_ext);
tlsv1_client_free_dh(conn);
x509_certificate_chain_free(conn->trusted_certs);
x509_certificate_chain_free(conn->client_cert);
crypto_private_key_free(conn->client_key);
os_free(conn);
}
/**
* tlsv1_client_established - Check whether connection has been established
* @conn: TLSv1 client connection data from tlsv1_client_init()
* Returns: 1 if connection is established, 0 if not
*/
int tlsv1_client_established(struct tlsv1_client *conn)
{
return conn->state == ESTABLISHED;
}
/**
* tlsv1_client_prf - Use TLS-PRF to derive keying material
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @label: Label (e.g., description of the key) for PRF
* @server_random_first: seed is 0 = client_random|server_random,
* 1 = server_random|client_random
* @out: Buffer for output data from TLS-PRF
* @out_len: Length of the output buffer
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_prf(struct tlsv1_client *conn, const char *label,
int server_random_first, u8 *out, size_t out_len)
{
u8 seed[2 * TLS_RANDOM_LEN];
if (conn->state != ESTABLISHED)
return -1;
if (server_random_first) {
os_memcpy(seed, conn->server_random, TLS_RANDOM_LEN);
os_memcpy(seed + TLS_RANDOM_LEN, conn->client_random,
TLS_RANDOM_LEN);
} else {
os_memcpy(seed, conn->client_random, TLS_RANDOM_LEN);
os_memcpy(seed + TLS_RANDOM_LEN, conn->server_random,
TLS_RANDOM_LEN);
}
return tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
label, seed, 2 * TLS_RANDOM_LEN, out, out_len);
}
/**
* tlsv1_client_get_cipher - Get current cipher name
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @buf: Buffer for the cipher name
* @buflen: buf size
* Returns: 0 on success, -1 on failure
*
* Get the name of the currently used cipher.
*/
int tlsv1_client_get_cipher(struct tlsv1_client *conn, char *buf,
size_t buflen)
{
char *cipher;
switch (conn->rl.cipher_suite) {
case TLS_RSA_WITH_RC4_128_MD5:
cipher = "RC4-MD5";
break;
case TLS_RSA_WITH_RC4_128_SHA:
cipher = "RC4-SHA";
break;
case TLS_RSA_WITH_DES_CBC_SHA:
cipher = "DES-CBC-SHA";
break;
case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
cipher = "DES-CBC3-SHA";
break;
default:
return -1;
}
os_snprintf(buf, buflen, "%s", cipher);
return 0;
}
/**
* tlsv1_client_shutdown - Shutdown TLS connection
* @conn: TLSv1 client connection data from tlsv1_client_init()
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_shutdown(struct tlsv1_client *conn)
{
conn->state = CLIENT_HELLO;
tlsv1_client_free_verify_hashes(conn);
if (tlsv1_client_init_verify_hashes(conn) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to re-initialize verify "
"hash");
return -1;
}
tlsv1_record_set_cipher_suite(&conn->rl, TLS_NULL_WITH_NULL_NULL);
tlsv1_record_change_write_cipher(&conn->rl);
tlsv1_record_change_read_cipher(&conn->rl);
conn->certificate_requested = 0;
crypto_public_key_free(conn->server_rsa_key);
conn->server_rsa_key = NULL;
conn->session_resumed = 0;
return 0;
}
/**
* tlsv1_client_resumed - Was session resumption used
* @conn: TLSv1 client connection data from tlsv1_client_init()
* Returns: 1 if current session used session resumption, 0 if not
*/
int tlsv1_client_resumed(struct tlsv1_client *conn)
{
return !!conn->session_resumed;
}
/**
* tlsv1_client_hello_ext - Set TLS extension for ClientHello
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @ext_type: Extension type
* @data: Extension payload (%NULL to remove extension)
* @data_len: Extension payload length
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_hello_ext(struct tlsv1_client *conn, int ext_type,
const u8 *data, size_t data_len)
{
u8 *pos;
conn->ticket = 0;
os_free(conn->client_hello_ext);
conn->client_hello_ext = NULL;
conn->client_hello_ext_len = 0;
if (data == NULL || data_len == 0)
return 0;
pos = conn->client_hello_ext = os_malloc(6 + data_len);
if (pos == NULL)
return -1;
WPA_PUT_BE16(pos, 4 + data_len);
pos += 2;
WPA_PUT_BE16(pos, ext_type);
pos += 2;
WPA_PUT_BE16(pos, data_len);
pos += 2;
os_memcpy(pos, data, data_len);
conn->client_hello_ext_len = 6 + data_len;
if (ext_type == TLS_EXT_PAC_OPAQUE) {
conn->ticket = 1;
wpa_printf(MSG_DEBUG, "TLSv1: Using session ticket");
}
return 0;
}
/**
* tlsv1_client_get_keys - Get master key and random data from TLS connection
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @keys: Structure of key/random data (filled on success)
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_get_keys(struct tlsv1_client *conn, struct tls_keys *keys)
{
os_memset(keys, 0, sizeof(*keys));
if (conn->state == CLIENT_HELLO)
return -1;
keys->client_random = conn->client_random;
keys->client_random_len = TLS_RANDOM_LEN;
if (conn->state != SERVER_HELLO) {
keys->server_random = conn->server_random;
keys->server_random_len = TLS_RANDOM_LEN;
keys->master_key = conn->master_secret;
keys->master_key_len = TLS_MASTER_SECRET_LEN;
}
return 0;
}
/**
* tlsv1_client_set_master_key - Configure master secret for TLS connection
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @key: TLS pre-master-secret
* @key_len: length of key in bytes
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_set_master_key(struct tlsv1_client *conn,
const u8 *key, size_t key_len)
{
if (key_len > TLS_MASTER_SECRET_LEN)
return -1;
wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: master_secret from session "
"ticket", key, key_len);
os_memcpy(conn->master_secret, key, key_len);
conn->ticket_key = 1;
return 0;
}
/**
* tlsv1_client_get_keyblock_size - Get TLS key_block size
* @conn: TLSv1 client connection data from tlsv1_client_init()
* Returns: Size of the key_block for the negotiated cipher suite or -1 on
* failure
*/
int tlsv1_client_get_keyblock_size(struct tlsv1_client *conn)
{
if (conn->state == CLIENT_HELLO || conn->state == SERVER_HELLO)
return -1;
return 2 * (conn->rl.hash_size + conn->rl.key_material_len +
conn->rl.iv_size);
}
/**
* tlsv1_client_set_cipher_list - Configure acceptable cipher suites
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @ciphers: Zero (TLS_CIPHER_NONE) terminated list of allowed ciphers
* (TLS_CIPHER_*).
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_set_cipher_list(struct tlsv1_client *conn, u8 *ciphers)
{
#ifdef EAP_FAST
size_t count;
u16 *suites;
/* TODO: implement proper configuration of cipher suites */
if (ciphers[0] == TLS_CIPHER_ANON_DH_AES128_SHA) {
count = 0;
suites = conn->cipher_suites;
suites[count++] = TLS_DH_anon_WITH_AES_256_CBC_SHA;
suites[count++] = TLS_DH_anon_WITH_AES_128_CBC_SHA;
suites[count++] = TLS_DH_anon_WITH_3DES_EDE_CBC_SHA;
suites[count++] = TLS_DH_anon_WITH_RC4_128_MD5;
suites[count++] = TLS_DH_anon_WITH_DES_CBC_SHA;
conn->num_cipher_suites = count;
}
return 0;
#else /* EAP_FAST */
return -1;
#endif /* EAP_FAST */
}
static int tlsv1_client_add_cert_der(struct x509_certificate **chain,
const u8 *buf, size_t len)
{
struct x509_certificate *cert;
char name[128];
cert = x509_certificate_parse(buf, len);
if (cert == NULL) {
wpa_printf(MSG_INFO, "TLSv1: %s - failed to parse certificate",
__func__);
return -1;
}
cert->next = *chain;
*chain = cert;
x509_name_string(&cert->subject, name, sizeof(name));
wpa_printf(MSG_DEBUG, "TLSv1: Added certificate: %s", name);
return 0;
}
static const char *pem_cert_begin = "-----BEGIN CERTIFICATE-----";
static const char *pem_cert_end = "-----END CERTIFICATE-----";
static const u8 * search_tag(const char *tag, const u8 *buf, size_t len)
{
size_t i, plen;
plen = os_strlen(tag);
if (len < plen)
return NULL;
for (i = 0; i < len - plen; i++) {
if (os_memcmp(buf + i, tag, plen) == 0)
return buf + i;
}
return NULL;
}
static int tlsv1_client_add_cert(struct x509_certificate **chain,
const u8 *buf, size_t len)
{
const u8 *pos, *end;
unsigned char *der;
size_t der_len;
pos = search_tag(pem_cert_begin, buf, len);
if (!pos) {
wpa_printf(MSG_DEBUG, "TLSv1: No PEM certificate tag found - "
"assume DER format");
return tlsv1_client_add_cert_der(chain, buf, len);
}
wpa_printf(MSG_DEBUG, "TLSv1: Converting PEM format certificate into "
"DER format");
while (pos) {
pos += os_strlen(pem_cert_begin);
end = search_tag(pem_cert_end, pos, buf + len - pos);
if (end == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Could not find PEM "
"certificate end tag (%s)", pem_cert_end);
return -1;
}
der = base64_decode(pos, end - pos, &der_len);
if (der == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Could not decode PEM "
"certificate");
return -1;
}
if (tlsv1_client_add_cert_der(chain, der, der_len) < 0) {
wpa_printf(MSG_INFO, "TLSv1: Failed to parse PEM "
"certificate after DER conversion");
os_free(der);
return -1;
}
os_free(der);
end += os_strlen(pem_cert_end);
pos = search_tag(pem_cert_begin, end, buf + len - end);
}
return 0;
}
static int tlsv1_client_set_cert_chain(struct x509_certificate **chain,
const char *cert, const u8 *cert_blob,
size_t cert_blob_len)
{
if (cert_blob)
return tlsv1_client_add_cert(chain, cert_blob, cert_blob_len);
if (cert) {
u8 *buf;
size_t len;
int ret;
buf = (u8 *) os_readfile(cert, &len);
if (buf == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Failed to read '%s'",
cert);
return -1;
}
ret = tlsv1_client_add_cert(chain, buf, len);
os_free(buf);
return ret;
}
return 0;
}
/**
* tlsv1_client_set_ca_cert - Set trusted CA certificate(s)
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @cert: File or reference name for X.509 certificate in PEM or DER format
* @cert_blob: cert as inlined data or %NULL if not used
* @cert_blob_len: ca_cert_blob length
* @path: Path to CA certificates (not yet supported)
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_set_ca_cert(struct tlsv1_client *conn, const char *cert,
const u8 *cert_blob, size_t cert_blob_len,
const char *path)
{
if (tlsv1_client_set_cert_chain(&conn->trusted_certs, cert,
cert_blob, cert_blob_len) < 0)
return -1;
if (path) {
/* TODO: add support for reading number of certificate files */
wpa_printf(MSG_INFO, "TLSv1: Use of CA certificate directory "
"not yet supported");
return -1;
}
return 0;
}
/**
* tlsv1_client_set_client_cert - Set client certificate
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @cert: File or reference name for X.509 certificate in PEM or DER format
* @cert_blob: cert as inlined data or %NULL if not used
* @cert_blob_len: ca_cert_blob length
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_set_client_cert(struct tlsv1_client *conn, const char *cert,
const u8 *cert_blob, size_t cert_blob_len)
{
return tlsv1_client_set_cert_chain(&conn->client_cert, cert,
cert_blob, cert_blob_len);
}
static int tlsv1_client_set_key(struct tlsv1_client *conn,
const u8 *key, size_t len)
{
conn->client_key = crypto_private_key_import(key, len);
if (conn->client_key == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Failed to parse private key");
return -1;
}
return 0;
}
/**
* tlsv1_client_set_private_key - Set client private key
* @conn: TLSv1 client connection data from tlsv1_client_init()
* @private_key: File or reference name for the key in PEM or DER format
* @private_key_passwd: Passphrase for decrypted private key, %NULL if no
* passphrase is used.
* @private_key_blob: private_key as inlined data or %NULL if not used
* @private_key_blob_len: private_key_blob length
* Returns: 0 on success, -1 on failure
*/
int tlsv1_client_set_private_key(struct tlsv1_client *conn,
const char *private_key,
const char *private_key_passwd,
const u8 *private_key_blob,
size_t private_key_blob_len)
{
crypto_private_key_free(conn->client_key);
conn->client_key = NULL;
if (private_key_blob)
return tlsv1_client_set_key(conn, private_key_blob,
private_key_blob_len);
if (private_key) {
u8 *buf;
size_t len;
int ret;
buf = (u8 *) os_readfile(private_key, &len);
if (buf == NULL) {
wpa_printf(MSG_INFO, "TLSv1: Failed to read '%s'",
private_key);
return -1;
}
ret = tlsv1_client_set_key(conn, buf, len);
os_free(buf);
return ret;
}
return 0;
}
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