SECStatus
ssl3_ExtConsumeHandshake(const sslSocket *ss, void *v, PRUint32 bytes,
PRUint8 **b, PRUint32 *length)
{
return ssl3_ConsumeHandshake((sslSocket *)ss, v, bytes, b, length);
}
SECStatus
ssl3_HandleECDHServerKeyExchange(sslSocket *ss, SSL3Opaque *b, PRUint32 length)
{
PLArenaPool *arena = NULL;
SECKEYPublicKey *peerKey = NULL;
PRBool isTLS;
SECStatus rv;
int errCode = SSL_ERROR_RX_MALFORMED_SERVER_KEY_EXCH;
SSL3AlertDescription desc = illegal_parameter;
SSL3Hashes hashes;
SECItem signature = { siBuffer, NULL, 0 };
SSLHashType hashAlg = ssl_hash_none;
SECItem ec_params = { siBuffer, NULL, 0 };
SECItem ec_point = { siBuffer, NULL, 0 };
unsigned char paramBuf[3]; /* only for curve_type == named_curve */
const namedGroupDef *ecGroup;
isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);
ec_params.len = sizeof paramBuf;
ec_params.data = paramBuf;
rv = ssl3_ConsumeHandshake(ss, ec_params.data, ec_params.len, &b, &length);
if (rv != SECSuccess) {
goto loser; /* malformed. */
}
/* Fail if the curve is not a named curve */
if (ec_params.data[0] != ec_type_named) {
errCode = SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
desc = handshake_failure;
goto alert_loser;
}
ecGroup = ssl_LookupNamedGroup(ec_params.data[1] << 8 | ec_params.data[2]);
if (!ecGroup || ecGroup->type != group_type_ec) {
errCode = SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
desc = handshake_failure;
goto alert_loser;
}
rv = ssl3_ConsumeHandshakeVariable(ss, &ec_point, 1, &b, &length);
if (rv != SECSuccess) {
goto loser; /* malformed. */
}
/* Fail if the provided point has length 0. */
if (!ec_point.len) {
/* desc and errCode are initialized already */
goto alert_loser;
}
/* Fail if the ec point uses compressed representation. */
if (ec_point.data[0] != EC_POINT_FORM_UNCOMPRESSED) {
errCode = SEC_ERROR_UNSUPPORTED_EC_POINT_FORM;
desc = handshake_failure;
goto alert_loser;
}
if (ss->ssl3.prSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2) {
SSLSignatureAndHashAlg sigAndHash;
rv = ssl3_ConsumeSignatureAndHashAlgorithm(ss, &b, &length,
&sigAndHash);
if (rv != SECSuccess) {
goto loser; /* malformed or unsupported. */
}
rv = ssl3_CheckSignatureAndHashAlgorithmConsistency(
ss, &sigAndHash, ss->sec.peerCert);
if (rv != SECSuccess) {
goto loser;
}
hashAlg = sigAndHash.hashAlg;
}
rv = ssl3_ConsumeHandshakeVariable(ss, &signature, 2, &b, &length);
if (rv != SECSuccess) {
goto loser; /* malformed. */
}
if (length != 0) {
if (isTLS)
desc = decode_error;
goto alert_loser; /* malformed. */
}
PRINT_BUF(60, (NULL, "Server EC params", ec_params.data,
ec_params.len));
PRINT_BUF(60, (NULL, "Server EC point", ec_point.data, ec_point.len));
/* failures after this point are not malformed handshakes. */
/* TLS: send decrypt_error if signature failed. */
desc = isTLS ? decrypt_error : handshake_failure;
/*
* check to make sure the hash is signed by right guy
*/
rv = ssl3_ComputeECDHKeyHash(hashAlg, ec_params, ec_point,
&ss->ssl3.hs.client_random,
&ss->ssl3.hs.server_random,
&hashes, ss->opt.bypassPKCS11);
if (rv != SECSuccess) {
errCode =
ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
goto alert_loser;
}
rv = ssl3_VerifySignedHashes(&hashes, ss->sec.peerCert, &signature,
isTLS, ss->pkcs11PinArg);
if (rv != SECSuccess) {
errCode =
ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
goto alert_loser;
}
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if (arena == NULL) {
errCode = SEC_ERROR_NO_MEMORY;
goto loser;
}
peerKey = PORT_ArenaZNew(arena, SECKEYPublicKey);
if (peerKey == NULL) {
errCode = SEC_ERROR_NO_MEMORY;
goto loser;
}
peerKey->arena = arena;
peerKey->keyType = ecKey;
/* set up EC parameters in peerKey */
rv = ssl_NamedGroup2ECParams(arena, ecGroup,
&peerKey->u.ec.DEREncodedParams);
if (rv != SECSuccess) {
/* we should never get here since we already
* checked that we are dealing with a supported curve
*/
errCode = SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
goto alert_loser;
}
/* copy publicValue in peerKey */
if (SECITEM_CopyItem(arena, &peerKey->u.ec.publicValue, &ec_point)) {
errCode = SEC_ERROR_NO_MEMORY;
goto loser;
}
peerKey->pkcs11Slot = NULL;
peerKey->pkcs11ID = CK_INVALID_HANDLE;
ss->sec.peerKey = peerKey;
return SECSuccess;
alert_loser:
(void)SSL3_SendAlert(ss, alert_fatal, desc);
loser:
if (arena) {
PORT_FreeArena(arena, PR_FALSE);
}
PORT_SetError(errCode);
return SECFailure;
}
SECStatus
ssl3_HandleECDHServerKeyExchange(sslSocket *ss, SSL3Opaque *b, PRUint32 length)
{
PLArenaPool *arena = NULL;
SECKEYPublicKey *peerKey = NULL;
PRBool isTLS;
SECStatus rv;
int errCode = SSL_ERROR_RX_MALFORMED_SERVER_KEY_EXCH;
SSL3AlertDescription desc = illegal_parameter;
SSL3Hashes hashes;
SECItem signature = { siBuffer, NULL, 0 };
SSLHashType hashAlg;
SSLSignatureScheme sigScheme;
SECItem ec_params = { siBuffer, NULL, 0 };
SECItem ec_point = { siBuffer, NULL, 0 };
unsigned char paramBuf[3];
const sslNamedGroupDef *ecGroup;
isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);
ec_params.len = sizeof paramBuf;
ec_params.data = paramBuf;
rv = ssl3_ConsumeHandshake(ss, ec_params.data, ec_params.len, &b, &length);
if (rv != SECSuccess) {
goto loser; /* malformed. */
}
/* Fail if the curve is not a named curve */
if (ec_params.data[0] != ec_type_named) {
errCode = SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
desc = handshake_failure;
goto alert_loser;
}
ecGroup = ssl_LookupNamedGroup(ec_params.data[1] << 8 | ec_params.data[2]);
if (!ecGroup || ecGroup->keaType != ssl_kea_ecdh) {
errCode = SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
desc = handshake_failure;
goto alert_loser;
}
rv = ssl3_ConsumeHandshakeVariable(ss, &ec_point, 1, &b, &length);
if (rv != SECSuccess) {
goto loser; /* malformed. */
}
/* Fail if the provided point has length 0. */
if (!ec_point.len) {
/* desc and errCode are initialized already */
goto alert_loser;
}
/* Fail if the ec point is not uncompressed for any curve that's not 25519. */
if (ecGroup->name != ssl_grp_ec_curve25519 &&
ec_point.data[0] != EC_POINT_FORM_UNCOMPRESSED) {
errCode = SEC_ERROR_UNSUPPORTED_EC_POINT_FORM;
desc = handshake_failure;
goto alert_loser;
}
PORT_Assert(ss->ssl3.prSpec->version <= SSL_LIBRARY_VERSION_TLS_1_2);
if (ss->ssl3.prSpec->version == SSL_LIBRARY_VERSION_TLS_1_2) {
rv = ssl_ConsumeSignatureScheme(ss, &b, &length, &sigScheme);
if (rv != SECSuccess) {
goto loser; /* malformed or unsupported. */
}
rv = ssl_CheckSignatureSchemeConsistency(ss, sigScheme,
ss->sec.peerCert);
if (rv != SECSuccess) {
goto loser;
}
hashAlg = ssl_SignatureSchemeToHashType(sigScheme);
} else {
/* Use ssl_hash_none to represent the MD5+SHA1 combo. */
hashAlg = ssl_hash_none;
sigScheme = ssl_sig_none;
}
rv = ssl3_ConsumeHandshakeVariable(ss, &signature, 2, &b, &length);
if (rv != SECSuccess) {
goto loser; /* malformed. */
}
if (length != 0) {
if (isTLS)
desc = decode_error;
goto alert_loser; /* malformed. */
}
PRINT_BUF(60, (NULL, "Server EC params", ec_params.data, ec_params.len));
PRINT_BUF(60, (NULL, "Server EC point", ec_point.data, ec_point.len));
/* failures after this point are not malformed handshakes. */
/* TLS: send decrypt_error if signature failed. */
desc = isTLS ? decrypt_error : handshake_failure;
/*
* check to make sure the hash is signed by right guy
*/
rv = ssl3_ComputeECDHKeyHash(hashAlg, ec_params, ec_point,
&ss->ssl3.hs.client_random,
&ss->ssl3.hs.server_random,
&hashes);
if (rv != SECSuccess) {
errCode =
ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
goto alert_loser;
}
rv = ssl3_VerifySignedHashes(ss, sigScheme, &hashes, &signature);
if (rv != SECSuccess) {
errCode =
ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
goto alert_loser;
}
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if (arena == NULL) {
errCode = SEC_ERROR_NO_MEMORY;
goto loser;
}
peerKey = PORT_ArenaZNew(arena, SECKEYPublicKey);
if (peerKey == NULL) {
errCode = SEC_ERROR_NO_MEMORY;
goto loser;
}
peerKey->arena = arena;
/* create public key from point data */
rv = ssl_ImportECDHKeyShare(ss, peerKey, ec_point.data, ec_point.len,
ecGroup);
if (rv != SECSuccess) {
/* error code is set */
desc = handshake_failure;
errCode = PORT_GetError();
goto alert_loser;
}
peerKey->pkcs11Slot = NULL;
peerKey->pkcs11ID = CK_INVALID_HANDLE;
ss->sec.peerKey = peerKey;
return SECSuccess;
alert_loser:
(void)SSL3_SendAlert(ss, alert_fatal, desc);
loser:
if (arena) {
PORT_FreeArena(arena, PR_FALSE);
}
PORT_SetError(errCode);
return SECFailure;
}
