/*
* TLSv1 server - write handshake message
* Copyright (c) 2006-2014, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto/md5.h"
#include "crypto/sha1.h"
#include "crypto/sha256.h"
#include "crypto/tls.h"
#include "crypto/random.h"
#include "x509v3.h"
#include "tlsv1_common.h"
#include "tlsv1_record.h"
#include "tlsv1_server.h"
#include "tlsv1_server_i.h"
static size_t tls_server_cert_chain_der_len(struct tlsv1_server *conn)
{
size_t len = 0;
struct x509_certificate *cert;
cert = conn->cred ? conn->cred->cert : NULL;
while (cert) {
len += 3 + cert->cert_len;
if (x509_certificate_self_signed(cert))
break;
cert = x509_certificate_get_subject(conn->cred->trusted_certs,
&cert->issuer);
}
return len;
}
static int tls_write_server_hello(struct tlsv1_server *conn,
u8 **msgpos, u8 *end)
{
u8 *pos, *rhdr, *hs_start, *hs_length, *ext_start;
struct os_time now;
size_t rlen;
pos = *msgpos;
tlsv1_server_log(conn, "Send ServerHello");
rhdr = pos;
pos += TLS_RECORD_HEADER_LEN;
os_get_time(&now);
#ifdef TEST_FUZZ
now.sec = 0xfffefdfc;
#endif /* TEST_FUZZ */
WPA_PUT_BE32(conn->server_random, now.sec);
if (random_get_bytes(conn->server_random + 4, TLS_RANDOM_LEN - 4)) {
wpa_printf(MSG_ERROR, "TLSv1: Could not generate "
"server_random");
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "TLSv1: server_random",
conn->server_random, TLS_RANDOM_LEN);
conn->session_id_len = TLS_SESSION_ID_MAX_LEN;
if (random_get_bytes(conn->session_id, conn->session_id_len)) {
wpa_printf(MSG_ERROR, "TLSv1: Could not generate "
"session_id");
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "TLSv1: session_id",
conn->session_id, conn->session_id_len);
/* opaque fragment[TLSPlaintext.length] */
/* Handshake */
hs_start = pos;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_SERVER_HELLO;
/* uint24 length (to be filled) */
hs_length = pos;
pos += 3;
/* body - ServerHello */
/* ProtocolVersion server_version */
WPA_PUT_BE16(pos, conn->rl.tls_version);
pos += 2;
/* Random random: uint32 gmt_unix_time, opaque random_bytes */
os_memcpy(pos, conn->server_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_suite */
WPA_PUT_BE16(pos, conn->cipher_suite);
pos += 2;
/* CompressionMethod compression_method */
*pos++ = TLS_COMPRESSION_NULL;
/* Extension */
ext_start = pos;
pos += 2;
if (conn->status_request) {
/* Add a status_request extension with empty extension_data */
/* ExtensionsType extension_type = status_request(5) */
WPA_PUT_BE16(pos, TLS_EXT_STATUS_REQUEST);
pos += 2;
/* opaque extension_data<0..2^16-1> length */
WPA_PUT_BE16(pos, 0);
pos += 2;
}
if (conn->status_request_v2) {
/*
Add a status_request_v2 extension with empty extension_data
*/
/* ExtensionsType extension_type = status_request_v2(17) */
WPA_PUT_BE16(pos, TLS_EXT_STATUS_REQUEST_V2);
pos += 2;
/* opaque extension_data<0..2^16-1> length */
WPA_PUT_BE16(pos, 0);
pos += 2;
}
if (conn->session_ticket && conn->session_ticket_cb) {
int res = conn->session_ticket_cb(
conn->session_ticket_cb_ctx,
conn->session_ticket, conn->session_ticket_len,
conn->client_random, conn->server_random,
conn->master_secret);
if (res < 0) {
tlsv1_server_log(conn, "SessionTicket callback indicated failure");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_HANDSHAKE_FAILURE);
return -1;
}
conn->use_session_ticket = res;
if (conn->use_session_ticket) {
if (tlsv1_server_derive_keys(conn, NULL, 0) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
"derive keys");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
}
/*
* RFC 4507 specifies that server would include an empty
* SessionTicket extension in ServerHello and a
* NewSessionTicket message after the ServerHello. However,
* EAP-FAST (RFC 4851), i.e., the only user of SessionTicket
* extension at the moment, does not use such extensions.
*
* TODO: Add support for configuring RFC 4507 behavior and make
* EAP-FAST disable it.
*/
}
if (pos == ext_start + 2)
pos -= 2; /* no extensions */
else
WPA_PUT_BE16(ext_start, pos - ext_start - 2);
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
rhdr, end - rhdr, hs_start, pos - hs_start,
&rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to create TLS record");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos = rhdr + rlen;
*msgpos = pos;
return 0;
}
static int tls_write_server_certificate(struct tlsv1_server *conn,
u8 **msgpos, u8 *end)
{
u8 *pos, *rhdr, *hs_start, *hs_length, *cert_start;
size_t rlen;
struct x509_certificate *cert;
const struct tls_cipher_suite *suite;
suite = tls_get_cipher_suite(conn->rl.cipher_suite);
if (suite && suite->key_exchange == TLS_KEY_X_DH_anon) {
wpa_printf(MSG_DEBUG, "TLSv1: Do not send Certificate when "
"using anonymous DH");
return 0;
}
pos = *msgpos;
if (TLS_RECORD_HEADER_LEN + 1 + 3 + 3 > end - pos) {
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
tlsv1_server_log(conn, "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->cred->cert;
while (cert) {
if (3 + cert->cert_len > (size_t) (end - pos)) {
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));
tlsv1_server_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->cred->trusted_certs,
&cert->issuer);
}
if (cert == conn->cred->cert || cert == NULL) {
/*
* Server was not configured with all the needed certificates
* to form a full certificate chain. The client may fail to
* validate the chain unless it is configured with all the
* missing CA certificates.
*/
wpa_printf(MSG_DEBUG, "TLSv1: Full server 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, hs_start, pos - hs_start,
&rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos = rhdr + rlen;
tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}
static int tls_write_server_certificate_status(struct tlsv1_server *conn,
u8 **msgpos, u8 *end,
int ocsp_multi,
char *ocsp_resp,
size_t ocsp_resp_len)
{
u8 *pos, *rhdr, *hs_start, *hs_length;
size_t rlen;
if (!ocsp_resp) {
/*
* Client did not request certificate status or there is no
* matching response cached.
*/
return 0;
}
pos = *msgpos;
if (TLS_RECORD_HEADER_LEN + 1 + 3 + 1 + 3 + ocsp_resp_len >
(unsigned int) (end - pos)) {
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
tlsv1_server_log(conn, "Send CertificateStatus (multi=%d)", ocsp_multi);
rhdr = pos;
pos += TLS_RECORD_HEADER_LEN;
/* opaque fragment[TLSPlaintext.length] */
/* Handshake */
hs_start = pos;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE_STATUS;
/* uint24 length (to be filled) */
hs_length = pos;
pos += 3;
/* body - CertificateStatus
*
* struct {
* CertificateStatusType status_type;
* select (status_type) {
* case ocsp: OCSPResponse;
* case ocsp_multi: OCSPResponseList;
* } response;
* } CertificateStatus;
*
* opaque OCSPResponse<1..2^24-1>;
*
* struct {
* OCSPResponse ocsp_response_list<1..2^24-1>;
* } OCSPResponseList;
*/
/* CertificateStatusType status_type */
if (ocsp_multi)
*pos++ = 2; /* ocsp_multi(2) */
else
*pos++ = 1; /* ocsp(1) */
/* uint24 length of OCSPResponse */
WPA_PUT_BE24(pos, ocsp_resp_len);
pos += 3;
os_memcpy(pos, ocsp_resp, ocsp_resp_len);
pos += ocsp_resp_len;
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
rhdr, end - rhdr, hs_start, pos - hs_start,
&rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos = rhdr + rlen;
tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}
static int tls_write_server_key_exchange(struct tlsv1_server *conn,
u8 **msgpos, u8 *end)
{
tls_key_exchange keyx;
const struct tls_cipher_suite *suite;
u8 *pos, *rhdr, *hs_start, *hs_length, *server_params;
size_t rlen;
u8 *dh_ys;
size_t dh_ys_len;
const u8 *dh_p;
size_t dh_p_len;
suite = tls_get_cipher_suite(conn->rl.cipher_suite);
if (suite == NULL)
keyx = TLS_KEY_X_NULL;
else
keyx = suite->key_exchange;
if (!tls_server_key_exchange_allowed(conn->rl.cipher_suite)) {
wpa_printf(MSG_DEBUG, "TLSv1: No ServerKeyExchange needed");
return 0;
}
if (keyx != TLS_KEY_X_DH_anon && keyx != TLS_KEY_X_DHE_RSA) {
wpa_printf(MSG_DEBUG, "TLSv1: ServerKeyExchange not yet "
"supported with key exchange type %d", keyx);
return -1;
}
if (conn->cred == NULL || conn->cred->dh_p == NULL ||
conn->cred->dh_g == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: No DH parameters available for "
"ServerKeyExhcange");
return -1;
}
tlsv1_server_get_dh_p(conn, &dh_p, &dh_p_len);
os_free(conn->dh_secret);
conn->dh_secret_len = dh_p_len;
conn->dh_secret = os_malloc(conn->dh_secret_len);
if (conn->dh_secret == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
"memory for secret (Diffie-Hellman)");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
if (random_get_bytes(conn->dh_secret, conn->dh_secret_len)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random "
"data for Diffie-Hellman");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(conn->dh_secret);
conn->dh_secret = NULL;
return -1;
}
if (os_memcmp(conn->dh_secret, dh_p, conn->dh_secret_len) > 0)
conn->dh_secret[0] = 0; /* make sure secret < p */
pos = conn->dh_secret;
while (pos + 1 < conn->dh_secret + conn->dh_secret_len && *pos == 0)
pos++;
if (pos != conn->dh_secret) {
os_memmove(conn->dh_secret, pos,
conn->dh_secret_len - (pos - conn->dh_secret));
conn->dh_secret_len -= pos - conn->dh_secret;
}
wpa_hexdump_key(MSG_DEBUG, "TLSv1: DH server's secret value",
conn->dh_secret, conn->dh_secret_len);
/* Ys = g^secret mod p */
dh_ys_len = dh_p_len;
dh_ys = os_malloc(dh_ys_len);
if (dh_ys == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate memory for "
"Diffie-Hellman");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
if (crypto_mod_exp(conn->cred->dh_g, conn->cred->dh_g_len,
conn->dh_secret, conn->dh_secret_len,
dh_p, dh_p_len, dh_ys, &dh_ys_len)) {
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(dh_ys);
return -1;
}
wpa_hexdump(MSG_DEBUG, "TLSv1: DH Ys (server's public value)",
dh_ys, dh_ys_len);
/*
* struct {
* select (KeyExchangeAlgorithm) {
* case diffie_hellman:
* ServerDHParams params;
* Signature signed_params;
* case rsa:
* ServerRSAParams params;
* Signature signed_params;
* };
* } ServerKeyExchange;
*
* struct {
* opaque dh_p<1..2^16-1>;
* opaque dh_g<1..2^16-1>;
* opaque dh_Ys<1..2^16-1>;
* } ServerDHParams;
*/
pos = *msgpos;
tlsv1_server_log(conn, "Send ServerKeyExchange");
rhdr = pos;
pos += TLS_RECORD_HEADER_LEN;
/* opaque fragment[TLSPlaintext.length] */
/* Handshake */
hs_start = pos;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_SERVER_KEY_EXCHANGE;
/* uint24 length (to be filled) */
hs_length = pos;
pos += 3;
/* body - ServerDHParams */
server_params = pos;
/* dh_p */
if (2 + dh_p_len > (size_t) (end - pos)) {
wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space for "
"dh_p");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(dh_ys);
return -1;
}
WPA_PUT_BE16(pos, dh_p_len);
pos += 2;
os_memcpy(pos, dh_p, dh_p_len);
pos += dh_p_len;
/* dh_g */
if (2 + conn->cred->dh_g_len > (size_t) (end - pos)) {
wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space for "
"dh_g");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(dh_ys);
return -1;
}
WPA_PUT_BE16(pos, conn->cred->dh_g_len);
pos += 2;
os_memcpy(pos, conn->cred->dh_g, conn->cred->dh_g_len);
pos += conn->cred->dh_g_len;
/* dh_Ys */
if (2 + dh_ys_len > (size_t) (end - pos)) {
wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space for "
"dh_Ys");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(dh_ys);
return -1;
}
WPA_PUT_BE16(pos, dh_ys_len);
pos += 2;
os_memcpy(pos, dh_ys, dh_ys_len);
pos += dh_ys_len;
os_free(dh_ys);
/*
* select (SignatureAlgorithm)
* { case anonymous: struct { };
* case rsa:
* digitally-signed struct {
* opaque md5_hash[16];
* opaque sha_hash[20];
* };
* case dsa:
* digitally-signed struct {
* opaque sha_hash[20];
* };
* } Signature;
*
* md5_hash
* MD5(ClientHello.random + ServerHello.random + ServerParams);
*
* sha_hash
* SHA(ClientHello.random + ServerHello.random + ServerParams);
*/
if (keyx == TLS_KEY_X_DHE_RSA) {
u8 hash[100];
u8 *signed_start;
size_t clen;
int hlen;
if (conn->rl.tls_version >= TLS_VERSION_1_2) {
#ifdef CONFIG_TLSV12
hlen = tlsv12_key_x_server_params_hash(
conn->rl.tls_version, TLS_HASH_ALG_SHA256,
conn->client_random,
conn->server_random, server_params,
pos - server_params, hash + 19);
/*
* RFC 5246, 4.7:
* TLS v1.2 adds explicit indication of the used
* signature and hash algorithms.
*
* struct {
* HashAlgorithm hash;
* SignatureAlgorithm signature;
* } SignatureAndHashAlgorithm;
*/
if (hlen < 0 || end - pos < 2) {
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
*pos++ = TLS_HASH_ALG_SHA256;
*pos++ = TLS_SIGN_ALG_RSA;
/*
* RFC 3447, A.2.4 RSASSA-PKCS1-v1_5
*
* DigestInfo ::= SEQUENCE {
* digestAlgorithm DigestAlgorithm,
* digest OCTET STRING
* }
*
* SHA-256 OID: sha256WithRSAEncryption ::= {pkcs-1 11}
*
* DER encoded DigestInfo for SHA256 per RFC 3447:
* 30 31 30 0d 06 09 60 86 48 01 65 03 04 02 01 05 00
* 04 20 || H
*/
hlen += 19;
os_memcpy(hash,
"\x30\x31\x30\x0d\x06\x09\x60\x86\x48\x01\x65"
"\x03\x04\x02\x01\x05\x00\x04\x20", 19);
#else /* CONFIG_TLSV12 */
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
#endif /* CONFIG_TLSV12 */
} else {
hlen = tls_key_x_server_params_hash(
conn->rl.tls_version, conn->client_random,
conn->server_random, server_params,
pos - server_params, hash);
}
if (hlen < 0) {
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
wpa_hexdump(MSG_MSGDUMP, "TLS: ServerKeyExchange signed_params hash",
hash, hlen);
#ifdef CONFIG_TESTING_OPTIONS
if (conn->test_flags & TLS_BREAK_SRV_KEY_X_HASH) {
tlsv1_server_log(conn, "TESTING: Break ServerKeyExchange signed params hash");
hash[hlen - 1] ^= 0x80;
}
#endif /* CONFIG_TESTING_OPTIONS */
/*
* 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 (conn->cred == NULL ||
crypto_private_key_sign_pkcs1(conn->cred->key, hash, hlen,
pos, &clen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to sign hash (PKCS #1)");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
WPA_PUT_BE16(signed_start, clen);
#ifdef CONFIG_TESTING_OPTIONS
if (conn->test_flags & TLS_BREAK_SRV_KEY_X_SIGNATURE) {
tlsv1_server_log(conn, "TESTING: Break ServerKeyExchange signed params signature");
pos[clen - 1] ^= 0x80;
}
#endif /* CONFIG_TESTING_OPTIONS */
pos += clen;
}
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
rhdr, end - rhdr, hs_start, pos - hs_start,
&rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos = rhdr + rlen;
tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}
static int tls_write_server_certificate_request(struct tlsv1_server *conn,
u8 **msgpos, u8 *end)
{
u8 *pos, *rhdr, *hs_start, *hs_length;
size_t rlen;
if (!conn->verify_peer) {
wpa_printf(MSG_DEBUG, "TLSv1: No CertificateRequest needed");
return 0;
}
pos = *msgpos;
tlsv1_server_log(conn, "Send CertificateRequest");
rhdr = pos;
pos += TLS_RECORD_HEADER_LEN;
/* opaque fragment[TLSPlaintext.length] */
/* Handshake */
hs_start = pos;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE_REQUEST;
/* uint24 length (to be filled) */
hs_length = pos;
pos += 3;
/* body - CertificateRequest */
/*
* enum {
* rsa_sign(1), dss_sign(2), rsa_fixed_dh(3), dss_fixed_dh(4),
* (255)
* } ClientCertificateType;
* ClientCertificateType certificate_types<1..2^8-1>
*/
*pos++ = 1;
*pos++ = 1; /* rsa_sign */
/*
* opaque DistinguishedName<1..2^16-1>
* DistinguishedName certificate_authorities<3..2^16-1>
*/
/* TODO: add support for listing DNs for trusted CAs */
WPA_PUT_BE16(pos, 0);
pos += 2;
WPA_PUT_BE24(hs_length, pos - hs_length - 3);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
rhdr, end - rhdr, hs_start, pos - hs_start,
&rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
pos = rhdr + rlen;
tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}
static int tls_write_server_hello_done(struct tlsv1_server *conn,
u8 **msgpos, u8 *end)
{
u8 *pos;
size_t rlen;
u8 payload[4];
tlsv1_server_log(conn, "Send ServerHelloDone");
/* opaque fragment[TLSPlaintext.length] */
/* Handshake */
pos = payload;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_SERVER_HELLO_DONE;
/* uint24 length */
WPA_PUT_BE24(pos, 0);
pos += 3;
/* body - ServerHelloDone (empty) */
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
*msgpos, end - *msgpos, payload, pos - payload,
&rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
tls_verify_hash_add(&conn->verify, payload, pos - payload);
*msgpos += rlen;
return 0;
}
static int tls_write_server_change_cipher_spec(struct tlsv1_server *conn,
u8 **msgpos, u8 *end)
{
size_t rlen;
u8 payload[1];
tlsv1_server_log(conn, "Send ChangeCipherSpec");
payload[0] = TLS_CHANGE_CIPHER_SPEC;
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC,
*msgpos, end - *msgpos, payload, sizeof(payload),
&rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
tlsv1_server_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");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
*msgpos += rlen;
return 0;
}
static int tls_write_server_finished(struct tlsv1_server *conn,
u8 **msgpos, u8 *end)
{
u8 *pos, *hs_start;
size_t rlen, hlen;
u8 verify_data[1 + 3 + TLS_VERIFY_DATA_LEN];
u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN];
pos = *msgpos;
tlsv1_server_log(conn, "Send Finished");
/* Encrypted Handshake Message: Finished */
#ifdef CONFIG_TLSV12
if (conn->rl.tls_version >= TLS_VERSION_1_2) {
hlen = SHA256_MAC_LEN;
if (conn->verify.sha256_server == NULL ||
crypto_hash_finish(conn->verify.sha256_server, hash, &hlen)
< 0) {
conn->verify.sha256_server = NULL;
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
conn->verify.sha256_server = NULL;
} else {
#endif /* CONFIG_TLSV12 */
hlen = MD5_MAC_LEN;
if (conn->verify.md5_server == NULL ||
crypto_hash_finish(conn->verify.md5_server, hash, &hlen) < 0) {
tlsv1_server_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;
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
conn->verify.sha1_server = NULL;
hlen = MD5_MAC_LEN + SHA1_MAC_LEN;
#ifdef CONFIG_TLSV12
}
#endif /* CONFIG_TLSV12 */
if (tls_prf(conn->rl.tls_version,
conn->master_secret, TLS_MASTER_SECRET_LEN,
"server finished", hash, hlen,
verify_data + 1 + 3, TLS_VERIFY_DATA_LEN)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate verify_data");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (server)",
verify_data + 1 + 3, TLS_VERIFY_DATA_LEN);
#ifdef CONFIG_TESTING_OPTIONS
if (conn->test_flags & TLS_BREAK_VERIFY_DATA) {
tlsv1_server_log(conn, "TESTING: Break verify_data (server)");
verify_data[1 + 3 + 1] ^= 0x80;
}
#endif /* CONFIG_TESTING_OPTIONS */
/* Handshake */
pos = hs_start = verify_data;
/* HandshakeType msg_type */
*pos++ = TLS_HANDSHAKE_TYPE_FINISHED;
/* uint24 length */
WPA_PUT_BE24(pos, TLS_VERIFY_DATA_LEN);
pos += 3;
pos += TLS_VERIFY_DATA_LEN;
tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
*msgpos, end - *msgpos, hs_start, pos - hs_start,
&rlen) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
*msgpos += rlen;
return 0;
}
static u8 * tls_send_server_hello(struct tlsv1_server *conn, size_t *out_len)
{
u8 *msg, *end, *pos;
size_t msglen;
int ocsp_multi = 0;
char *ocsp_resp = NULL;
size_t ocsp_resp_len = 0;
*out_len = 0;
if (conn->status_request_multi &&
conn->cred->ocsp_stapling_response_multi) {
ocsp_resp = os_readfile(
conn->cred->ocsp_stapling_response_multi,
&ocsp_resp_len);
ocsp_multi = 1;
} else if ((conn->status_request || conn->status_request_v2) &&
conn->cred->ocsp_stapling_response) {
ocsp_resp = os_readfile(conn->cred->ocsp_stapling_response,
&ocsp_resp_len);
}
if (!ocsp_resp)
ocsp_resp_len = 0;
msglen = 1000 + tls_server_cert_chain_der_len(conn) + ocsp_resp_len;
msg = os_malloc(msglen);
if (msg == NULL) {
os_free(ocsp_resp);
return NULL;
}
pos = msg;
end = msg + msglen;
if (tls_write_server_hello(conn, &pos, end) < 0) {
os_free(msg);
os_free(ocsp_resp);
return NULL;
}
if (conn->use_session_ticket) {
os_free(ocsp_resp);
/* Abbreviated handshake using session ticket; RFC 4507 */
if (tls_write_server_change_cipher_spec(conn, &pos, end) < 0 ||
tls_write_server_finished(conn, &pos, end) < 0) {
os_free(msg);
return NULL;
}
*out_len = pos - msg;
conn->state = CHANGE_CIPHER_SPEC;
return msg;
}
/* Full handshake */
if (tls_write_server_certificate(conn, &pos, end) < 0 ||
tls_write_server_certificate_status(conn, &pos, end, ocsp_multi,
ocsp_resp, ocsp_resp_len) < 0 ||
tls_write_server_key_exchange(conn, &pos, end) < 0 ||
tls_write_server_certificate_request(conn, &pos, end) < 0 ||
tls_write_server_hello_done(conn, &pos, end) < 0) {
os_free(msg);
os_free(ocsp_resp);
return NULL;
}
os_free(ocsp_resp);
*out_len = pos - msg;
conn->state = CLIENT_CERTIFICATE;
return msg;
}
static u8 * tls_send_change_cipher_spec(struct tlsv1_server *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_server_change_cipher_spec(conn, &pos, end) < 0 ||
tls_write_server_finished(conn, &pos, end) < 0) {
os_free(msg);
return NULL;
}
*out_len = pos - msg;
tlsv1_server_log(conn, "Handshake completed successfully");
conn->state = ESTABLISHED;
return msg;
}
u8 * tlsv1_server_handshake_write(struct tlsv1_server *conn, size_t *out_len)
{
switch (conn->state) {
case SERVER_HELLO:
return tls_send_server_hello(conn, out_len);
case SERVER_CHANGE_CIPHER_SPEC:
return tls_send_change_cipher_spec(conn, out_len);
default:
if (conn->state == ESTABLISHED && conn->use_session_ticket) {
/* Abbreviated handshake was already completed. */
return NULL;
}
tlsv1_server_log(conn, "Unexpected state %d while generating reply",
conn->state);
return NULL;
}
}
u8 * tlsv1_server_send_alert(struct tlsv1_server *conn, u8 level,
u8 description, size_t *out_len)
{
u8 *alert, *pos, *length;
tlsv1_server_log(conn, "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, conn->rl.tls_version ? conn->rl.tls_version :
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;
}