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_change_cipher_spec(struct tlsv1_client *conn,
u8 **msgpos, u8 *end)
{
size_t rlen;
u8 payload[1];
wpa_printf(MSG_DEBUG, "TLSv1: 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");
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 += rlen;
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_application_data(struct tlsv1_client *conn, u8 ct,
const u8 *in_data, size_t *in_len,
u8 **out_data, size_t *out_len)
{
const u8 *pos;
size_t left;
if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
wpa_printf(MSG_DEBUG, "TLSv1: Expected Application Data; "
"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;
wpa_hexdump(MSG_DEBUG, "TLSv1: Application Data included in Handshake",
pos, left);
*out_data = os_malloc(left);
if (*out_data) {
os_memcpy(*out_data, pos, left);
*out_len = left;
}
return 0;
}
/**
* 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;
}
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, hs_start, 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->verify, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}
/**
* 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);
if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_APPLICATION_DATA,
out_data, out_len, in_data, 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;
}
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);
#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) {
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
conn->verify.sha256_server = NULL;
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) {
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;
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, 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_const(pos, verify_data, TLS_VERIFY_DATA_LEN) != 0) {
wpa_printf(MSG_INFO, "TLSv1: Mismatch in verify_data");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECRYPT_ERROR);
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received Finished");
*in_len = end - in_data;
conn->state = (conn->session_resumed || conn->use_session_ticket) ?
CHANGE_CIPHER_SPEC : ACK_FINISHED;
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;
}
if (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)) {
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(csecret);
os_free(dh_yc);
return -1;
}
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 */
if (crypto_mod_exp(conn->dh_ys, conn->dh_ys_len,
csecret_start, csecret_len,
conn->dh_p, conn->dh_p_len,
shared, &shared_len)) {
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
os_free(csecret);
os_free(shared);
return -1;
}
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 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->cred ? conn->cred->cert : NULL;
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->cred->trusted_certs,
&cert->issuer);
}
if (conn->cred == NULL || cert == conn->cred->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->verify, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}
static int tls_write_client_finished(struct tlsv1_client *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];
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 + 1 + 3, 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 + 1 + 3, TLS_VERIFY_DATA_LEN);
/* 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; /* verify_data already in place */
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");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
*msgpos += rlen;
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.
* @appl_data: Pointer to application data pointer, or %NULL if dropped
* @appl_data_len: Pointer to variable that is set to appl_data length
* 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, u8 **appl_data,
size_t *appl_data_len)
{
const u8 *pos, *end;
u8 *msg = NULL, *in_msg, *in_pos, *in_end, alert, ct;
size_t in_msg_len;
int no_appl_data;
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,
appl_data,
appl_data_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;
no_appl_data = appl_data == NULL || *appl_data == NULL;
msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);
failed:
os_free(in_msg);
if (conn->alert_level) {
conn->state = FAILED;
os_free(msg);
msg = tlsv1_client_send_alert(conn, conn->alert_level,
conn->alert_description,
out_len);
} else if (msg == NULL) {
msg = os_zalloc(1);
*out_len = 0;
}
return msg;
}
/**
* 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
* @need_more_data: Set to 1 if more data would be needed to complete
* processing
* Returns: Decrypted data or %NULL on failure
*
* This function is used after TLS handshake has been completed successfully to
* receive data from the encrypted tunnel.
*/
struct wpabuf * tlsv1_client_decrypt(struct tlsv1_client *conn,
const u8 *in_data, size_t in_len,
int *need_more_data)
{
const u8 *in_end, *pos;
int used;
u8 alert, *out_pos, ct;
size_t olen;
struct wpabuf *buf = NULL;
if (need_more_data)
*need_more_data = 0;
if (conn->partial_input) {
if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
"memory for pending record");
alert = TLS_ALERT_INTERNAL_ERROR;
goto fail;
}
wpabuf_put_data(conn->partial_input, in_data, in_len);
in_data = wpabuf_head(conn->partial_input);
in_len = wpabuf_len(conn->partial_input);
}
pos = in_data;
in_end = in_data + in_len;
while (pos < in_end) {
ct = pos[0];
if (wpabuf_resize(&buf, in_end - pos) < 0) {
alert = TLS_ALERT_INTERNAL_ERROR;
goto fail;
}
out_pos = wpabuf_put(buf, 0);
olen = wpabuf_tailroom(buf);
used = tlsv1_record_receive(&conn->rl, pos, in_end - pos,
out_pos, &olen, &alert);
if (used < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Record layer processing "
"failed");
goto fail;
}
if (used == 0) {
struct wpabuf *partial;
wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
partial = wpabuf_alloc_copy(pos, in_end - pos);
wpabuf_free(conn->partial_input);
conn->partial_input = partial;
if (conn->partial_input == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
"allocate memory for pending "
"record");
alert = TLS_ALERT_INTERNAL_ERROR;
goto fail;
}
if (need_more_data)
*need_more_data = 1;
return buf;
}
if (ct == TLS_CONTENT_TYPE_ALERT) {
if (olen < 2) {
wpa_printf(MSG_DEBUG, "TLSv1: Alert "
"underflow");
alert = TLS_ALERT_DECODE_ERROR;
goto fail;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
out_pos[0], out_pos[1]);
if (out_pos[0] == TLS_ALERT_LEVEL_WARNING) {
/* Continue processing */
pos += used;
continue;
}
alert = out_pos[1];
goto fail;
}
if (ct != TLS_CONTENT_TYPE_APPLICATION_DATA) {
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected content type "
"0x%x when decrypting application data",
pos[0]);
alert = TLS_ALERT_UNEXPECTED_MESSAGE;
goto fail;
}
wpabuf_put(buf, olen);
pos += used;
}
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
return buf;
fail:
wpabuf_free(buf);
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
return NULL;
}
int tlsv1_client_process_handshake(struct tlsv1_client *conn, u8 ct,
const u8 *buf, size_t *len,
u8 **out_data, size_t *out_len)
{
if (ct == TLS_CONTENT_TYPE_ALERT) {
if (*len < 2) {
wpa_printf(MSG_DEBUG, "TLSv1: Alert underflow");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_DECODE_ERROR);
return -1;
}
wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
buf[0], buf[1]);
*len = 2;
conn->state = FAILED;
return -1;
}
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;
case ACK_FINISHED:
if (out_data &&
tls_process_application_data(conn, ct, buf, len, out_data,
out_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->verify, buf, *len);
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 (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)");
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->verify, hs_start, pos - hs_start);
*msgpos = pos;
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);
if (conn->use_session_ticket) {
int res;
wpa_printf(MSG_DEBUG, "TLSv1: Server may have "
"rejected SessionTicket");
conn->use_session_ticket = 0;
/* Notify upper layers that SessionTicket failed */
res = conn->session_ticket_cb(
conn->session_ticket_cb_ctx, NULL, 0, NULL,
NULL, NULL);
if (res < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket "
"callback indicated failure");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_HANDSHAKE_FAILURE);
return -1;
}
conn->state = SERVER_CERTIFICATE;
return tls_process_certificate(conn, ct, in_data,
in_len);
}
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_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 (conn->cred &&
x509_certificate_chain_validate(conn->cred->trusted_certs, chain,
&reason, conn->disable_time_checks)
< 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 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->rl.cipher_suite)) {
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 ||
suite->key_exchange == TLS_KEY_X_DHE_RSA)) {
if (tlsv1_process_diffie_hellman(conn, pos, len,
suite->key_exchange) < 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_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;
u16 tls_version;
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;
tls_version = WPA_GET_BE16(pos);
if (!tls_version_ok(tls_version)) {
wpa_printf(MSG_DEBUG, "TLSv1: Unexpected protocol version in "
"ServerHello %u.%u", pos[0], pos[1]);
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_PROTOCOL_VERSION);
return -1;
}
pos += 2;
wpa_printf(MSG_DEBUG, "TLSv1: Using TLS v%s",
tls_version_str(tls_version));
conn->rl.tls_version = tls_version;
/* 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;
/* 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) {
/* TODO: ServerHello extensions */
wpa_hexdump(MSG_DEBUG, "TLSv1: Unexpected extra data in the "
"end of ServerHello", pos, end - pos);
goto decode_error;
}
if (conn->session_ticket_included && conn->session_ticket_cb) {
/* TODO: include SessionTicket extension if one was included in
* ServerHello */
int res = conn->session_ticket_cb(
conn->session_ticket_cb_ctx, NULL, 0,
conn->client_random, conn->server_random,
conn->master_secret);
if (res < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: SessionTicket callback "
"indicated failure");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_HANDSHAKE_FAILURE);
return -1;
}
conn->use_session_ticket = !!res;
}
if ((conn->session_resumed || conn->use_session_ticket) &&
tls_derive_keys(conn, NULL, 0)) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
*in_len = end - in_data;
conn->state = (conn->session_resumed || conn->use_session_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;
}
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->verify, 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;
}
/**
* 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.
* @appl_data: Pointer to application data pointer, or %NULL if dropped
* @appl_data_len: Pointer to variable that is set to appl_data length
* @need_more_data: Set to 1 if more data would be needed to complete
* processing
* 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, u8 **appl_data,
size_t *appl_data_len, int *need_more_data)
{
const u8 *pos, *end;
u8 *msg = NULL, *in_msg = NULL, *in_pos, *in_end, alert, ct;
size_t in_msg_len;
int no_appl_data;
int used;
if (need_more_data)
*need_more_data = 0;
if (conn->state == CLIENT_HELLO) {
if (in_len)
return NULL;
return tls_send_client_hello(conn, out_len);
}
if (conn->partial_input) {
if (wpabuf_resize(&conn->partial_input, in_len) < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
"memory for pending record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
goto failed;
}
wpabuf_put_data(conn->partial_input, in_data, in_len);
in_data = wpabuf_head(conn->partial_input);
in_len = wpabuf_len(conn->partial_input);
}
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;
used = tlsv1_record_receive(&conn->rl, pos, end - pos,
in_msg, &in_msg_len, &alert);
if (used < 0) {
wpa_printf(MSG_DEBUG, "TLSv1: Processing received "
"record failed");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL, alert);
goto failed;
}
if (used == 0) {
struct wpabuf *partial;
wpa_printf(MSG_DEBUG, "TLSv1: Need more data");
partial = wpabuf_alloc_copy(pos, end - pos);
wpabuf_free(conn->partial_input);
conn->partial_input = partial;
if (conn->partial_input == NULL) {
wpa_printf(MSG_DEBUG, "TLSv1: Failed to "
"allocate memory for pending "
"record");
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
goto failed;
}
os_free(in_msg);
if (need_more_data)
*need_more_data = 1;
return NULL;
}
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,
appl_data,
appl_data_len) < 0)
goto failed;
in_pos += in_msg_len;
}
pos += used;
}
os_free(in_msg);
in_msg = NULL;
no_appl_data = appl_data == NULL || *appl_data == NULL;
msg = tlsv1_client_handshake_write(conn, out_len, no_appl_data);
failed:
os_free(in_msg);
if (conn->alert_level) {
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
conn->state = FAILED;
os_free(msg);
msg = tlsv1_client_send_alert(conn, conn->alert_level,
conn->alert_description,
out_len);
} else if (msg == NULL) {
msg = os_zalloc(1);
*out_len = 0;
}
if (need_more_data == NULL || !(*need_more_data)) {
wpabuf_free(conn->partial_input);
conn->partial_input = NULL;
}
return msg;
}
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->verify, 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 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[100], *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;
#ifdef CONFIG_TLSV12
if (conn->rl.tls_version == TLS_VERSION_1_2) {
hlen = SHA256_MAC_LEN;
if (conn->verify.sha256_cert == NULL ||
crypto_hash_finish(conn->verify.sha256_cert, hpos, &hlen) <
0) {
conn->verify.sha256_cert = NULL;
tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
TLS_ALERT_INTERNAL_ERROR);
return -1;
}
conn->verify.sha256_cert = NULL;
/*
* 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
*/
os_memmove(hash + 19, hash, hlen);
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 {
#endif /* CONFIG_TLSV12 */
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;
#ifdef CONFIG_TLSV12
}
#endif /* CONFIG_TLSV12 */
wpa_hexdump(MSG_MSGDUMP, "TLSv1: CertificateVerify hash", hash, hlen);
#ifdef CONFIG_TLSV12
if (conn->rl.tls_version >= TLS_VERSION_1_2) {
/*
* RFC 5246, 4.7:
* TLS v1.2 adds explicit indication of the used signature and
* hash algorithms.
*
* struct {
* HashAlgorithm hash;
* SignatureAlgorithm signature;
* } SignatureAndHashAlgorithm;
*/
*pos++ = TLS_HASH_ALG_SHA256;
*pos++ = TLS_SIGN_ALG_RSA;
}
#endif /* CONFIG_TLSV12 */
/*
* 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)");
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, hs_start, 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->verify, hs_start, pos - hs_start);
*msgpos = pos;
return 0;
}