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firefox/security/nss/lib/ssl/ssl3ecc.c
Daniel Baumann 5e9a113729
Adding upstream version 140.0. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-25 09:37:52 +02:00

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* SSL3 Protocol
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* ECC code moved here from ssl3con.c */
#include "cert.h"
#include "ssl.h"
#include "cryptohi.h" /* for DSAU_ stuff */
#include "keyhi.h"
#include "secder.h"
#include "secitem.h"
#include "sslimpl.h"
#include "sslproto.h"
#include "sslerr.h"
#include "ssl3ext.h"
#include "prtime.h"
#include "prinrval.h"
#include "prerror.h"
#include "pratom.h"
#include "prthread.h"
#include "prinit.h"
#include "pk11func.h"
#include "secmod.h"
#include <stdio.h>
SECStatus
ssl_NamedGroup2ECParams(PLArenaPool *arena, const sslNamedGroupDef *ecGroup,
SECKEYECParams *params)
{
SECOidData *oidData = NULL;
if (!params) {
PORT_Assert(0);
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (!ecGroup || ecGroup->keaType != ssl_kea_ecdh ||
(oidData = SECOID_FindOIDByTag(ecGroup->oidTag)) == NULL) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
return SECFailure;
}
if (SECITEM_AllocItem(arena, params, (2 + oidData->oid.len)) == NULL) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
return SECFailure;
}
/*
* params->data needs to contain the ASN encoding of an object ID (OID)
* representing the named curve. The actual OID is in
* oidData->oid.data so we simply prepend 0x06 and OID length
*/
params->data[0] = SEC_ASN1_OBJECT_ID;
params->data[1] = oidData->oid.len;
memcpy(params->data + 2, oidData->oid.data, oidData->oid.len);
return SECSuccess;
}
const sslNamedGroupDef *
ssl_ECPubKey2NamedGroup(const SECKEYPublicKey *pubKey)
{
SECItem oid = { siBuffer, NULL, 0 };
SECOidData *oidData = NULL;
PRUint32 policyFlags = 0;
unsigned int i;
const SECKEYECParams *params;
if (pubKey->keyType != ecKey) {
PORT_Assert(0);
return NULL;
}
params = &pubKey->u.ec.DEREncodedParams;
/*
* params->data needs to contain the ASN encoding of an object ID (OID)
* representing a named curve. Here, we strip away everything
* before the actual OID and use the OID to look up a named curve.
*/
if (params->data[0] != SEC_ASN1_OBJECT_ID)
return NULL;
oid.len = params->len - 2;
oid.data = params->data + 2;
if ((oidData = SECOID_FindOID(&oid)) == NULL)
return NULL;
if ((NSS_GetAlgorithmPolicy(oidData->offset, &policyFlags) ==
SECSuccess) &&
!(policyFlags & NSS_USE_ALG_IN_SSL_KX)) {
return NULL;
}
for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
if (ssl_named_groups[i].oidTag == oidData->offset) {
return &ssl_named_groups[i];
}
}
return NULL;
}
/* Caller must set hiLevel error code. */
static SECStatus
ssl3_ComputeECDHKeyHash(SSLHashType hashAlg,
SECItem ec_params, SECItem server_ecpoint,
PRUint8 *client_rand, PRUint8 *server_rand,
SSL3Hashes *hashes)
{
PRUint8 *hashBuf;
PRUint8 *pBuf;
SECStatus rv = SECSuccess;
unsigned int bufLen;
/*
* We only support named curves (the appropriate checks are made before this
* method is called) so ec_params takes up only two bytes. ECPoint needs to
* fit in 256 bytes because the spec says the length must fit in one byte.
*/
PRUint8 buf[2 * SSL3_RANDOM_LENGTH + 2 + 1 + 256];
bufLen = 2 * SSL3_RANDOM_LENGTH + ec_params.len + 1 + server_ecpoint.len;
if (bufLen <= sizeof buf) {
hashBuf = buf;
} else {
hashBuf = PORT_Alloc(bufLen);
if (!hashBuf) {
return SECFailure;
}
}
memcpy(hashBuf, client_rand, SSL3_RANDOM_LENGTH);
pBuf = hashBuf + SSL3_RANDOM_LENGTH;
memcpy(pBuf, server_rand, SSL3_RANDOM_LENGTH);
pBuf += SSL3_RANDOM_LENGTH;
memcpy(pBuf, ec_params.data, ec_params.len);
pBuf += ec_params.len;
pBuf[0] = (PRUint8)(server_ecpoint.len);
pBuf += 1;
memcpy(pBuf, server_ecpoint.data, server_ecpoint.len);
pBuf += server_ecpoint.len;
PORT_Assert((unsigned int)(pBuf - hashBuf) == bufLen);
rv = ssl3_ComputeCommonKeyHash(hashAlg, hashBuf, bufLen, hashes);
PRINT_BUF(95, (NULL, "ECDHkey hash: ", hashBuf, bufLen));
PRINT_BUF(95, (NULL, "ECDHkey hash: MD5 result",
hashes->u.s.md5, MD5_LENGTH));
PRINT_BUF(95, (NULL, "ECDHkey hash: SHA1 result",
hashes->u.s.sha, SHA1_LENGTH));
if (hashBuf != buf)
PORT_Free(hashBuf);
return rv;
}
/* Called from ssl3_SendClientKeyExchange(). */
SECStatus
ssl3_SendECDHClientKeyExchange(sslSocket *ss, SECKEYPublicKey *svrPubKey)
{
PK11SymKey *pms = NULL;
SECStatus rv = SECFailure;
PRBool isTLS, isTLS12;
CK_MECHANISM_TYPE target;
const sslNamedGroupDef *groupDef;
sslEphemeralKeyPair *keyPair = NULL;
SECKEYPublicKey *pubKey;
PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
isTLS = (PRBool)(ss->version > SSL_LIBRARY_VERSION_3_0);
isTLS12 = (PRBool)(ss->version >= SSL_LIBRARY_VERSION_TLS_1_2);
/* Generate ephemeral EC keypair */
if (svrPubKey->keyType != ecKey) {
PORT_SetError(SEC_ERROR_BAD_KEY);
goto loser;
}
groupDef = ssl_ECPubKey2NamedGroup(svrPubKey);
if (!groupDef) {
PORT_SetError(SEC_ERROR_BAD_KEY);
goto loser;
}
ss->sec.keaGroup = groupDef;
rv = ssl_CreateECDHEphemeralKeyPair(ss, groupDef, &keyPair);
if (rv != SECSuccess) {
ssl_MapLowLevelError(SEC_ERROR_KEYGEN_FAIL);
goto loser;
}
pubKey = keyPair->keys->pubKey;
PRINT_BUF(50, (ss, "ECDH public value:",
pubKey->u.ec.publicValue.data,
pubKey->u.ec.publicValue.len));
if (isTLS12) {
target = CKM_TLS12_MASTER_KEY_DERIVE_DH;
} else if (isTLS) {
target = CKM_TLS_MASTER_KEY_DERIVE_DH;
} else {
target = CKM_SSL3_MASTER_KEY_DERIVE_DH;
}
/* Determine the PMS */
pms = PK11_PubDeriveWithKDF(keyPair->keys->privKey, svrPubKey,
PR_FALSE, NULL, NULL, CKM_ECDH1_DERIVE, target,
CKA_DERIVE, 0, CKD_NULL, NULL, NULL);
if (pms == NULL) {
(void)SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
goto loser;
}
rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_client_key_exchange,
pubKey->u.ec.publicValue.len + 1);
if (rv != SECSuccess) {
goto loser; /* err set by ssl3_AppendHandshake* */
}
rv = ssl3_AppendHandshakeVariable(ss, pubKey->u.ec.publicValue.data,
pubKey->u.ec.publicValue.len, 1);
if (rv != SECSuccess) {
goto loser; /* err set by ssl3_AppendHandshake* */
}
rv = ssl3_InitPendingCipherSpecs(ss, pms, PR_TRUE);
if (rv != SECSuccess) {
ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
goto loser;
}
PK11_FreeSymKey(pms);
ssl_FreeEphemeralKeyPair(keyPair);
return SECSuccess;
loser:
if (pms)
PK11_FreeSymKey(pms);
if (keyPair)
ssl_FreeEphemeralKeyPair(keyPair);
return SECFailure;
}
/*
** Called from ssl3_HandleClientKeyExchange()
*/
SECStatus
ssl3_HandleECDHClientKeyExchange(sslSocket *ss, PRUint8 *b,
PRUint32 length,
sslKeyPair *serverKeyPair)
{
PK11SymKey *pms;
SECStatus rv;
SECKEYPublicKey clntPubKey;
CK_MECHANISM_TYPE target;
PRBool isTLS, isTLS12;
int errCode = SSL_ERROR_RX_MALFORMED_CLIENT_KEY_EXCH;
PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
clntPubKey.keyType = ecKey;
clntPubKey.u.ec.DEREncodedParams.len =
serverKeyPair->pubKey->u.ec.DEREncodedParams.len;
clntPubKey.u.ec.DEREncodedParams.data =
serverKeyPair->pubKey->u.ec.DEREncodedParams.data;
clntPubKey.u.ec.encoding = ECPoint_Undefined;
rv = ssl3_ConsumeHandshakeVariable(ss, &clntPubKey.u.ec.publicValue,
1, &b, &length);
if (rv != SECSuccess) {
PORT_SetError(errCode);
return SECFailure;
}
/* we have to catch the case when the client's public key has length 0. */
if (!clntPubKey.u.ec.publicValue.len) {
(void)SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
PORT_SetError(errCode);
return SECFailure;
}
isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);
isTLS12 = (PRBool)(ss->ssl3.prSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2);
if (isTLS12) {
target = CKM_TLS12_MASTER_KEY_DERIVE_DH;
} else if (isTLS) {
target = CKM_TLS_MASTER_KEY_DERIVE_DH;
} else {
target = CKM_SSL3_MASTER_KEY_DERIVE_DH;
}
/* Determine the PMS */
pms = PK11_PubDeriveWithKDF(serverKeyPair->privKey, &clntPubKey,
PR_FALSE, NULL, NULL,
CKM_ECDH1_DERIVE, target, CKA_DERIVE, 0,
CKD_NULL, NULL, NULL);
if (pms == NULL) {
/* last gasp. */
errCode = ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
PORT_SetError(errCode);
return SECFailure;
}
rv = ssl3_InitPendingCipherSpecs(ss, pms, PR_TRUE);
PK11_FreeSymKey(pms);
if (rv != SECSuccess) {
/* error code set by ssl3_InitPendingCipherSpec */
return SECFailure;
}
ss->sec.keaGroup = ssl_ECPubKey2NamedGroup(&clntPubKey);
return SECSuccess;
}
/*
** Take an encoded key share and make a public key out of it.
*/
SECStatus
ssl_ImportECDHKeyShare(SECKEYPublicKey *peerKey,
PRUint8 *b, PRUint32 length,
const sslNamedGroupDef *ecGroup)
{
SECStatus rv;
SECItem ecPoint = { siBuffer, NULL, 0 };
if (!length) {
PORT_SetError(SSL_ERROR_RX_MALFORMED_ECDHE_KEY_SHARE);
return SECFailure;
}
/* Fail if the ec point uses compressed representation */
if (b[0] != EC_POINT_FORM_UNCOMPRESSED &&
ecGroup->name != ssl_grp_ec_curve25519) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_EC_POINT_FORM);
return SECFailure;
}
peerKey->keyType = ecKey;
/* Set up the encoded params */
rv = ssl_NamedGroup2ECParams(peerKey->arena, ecGroup,
&peerKey->u.ec.DEREncodedParams);
if (rv != SECSuccess) {
ssl_MapLowLevelError(SSL_ERROR_RX_MALFORMED_ECDHE_KEY_SHARE);
return SECFailure;
}
peerKey->u.ec.encoding = ECPoint_Undefined;
/* copy publicValue in peerKey */
ecPoint.data = b;
ecPoint.len = length;
rv = SECITEM_CopyItem(peerKey->arena, &peerKey->u.ec.publicValue, &ecPoint);
if (rv != SECSuccess) {
return SECFailure;
}
return SECSuccess;
}
const sslNamedGroupDef *
ssl_GetECGroupWithStrength(sslSocket *ss, unsigned int requiredECCbits)
{
int i;
PORT_Assert(ss);
for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
const sslNamedGroupDef *group = ss->namedGroupPreferences[i];
if (group && group->keaType == ssl_kea_ecdh &&
group->bits >= requiredECCbits) {
return group;
}
}
PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
return NULL;
}
/* Find the "weakest link". Get the strength of the signature and symmetric
* keys and choose a curve based on the weakest of those two. */
const sslNamedGroupDef *
ssl_GetECGroupForServerSocket(sslSocket *ss)
{
const sslServerCert *cert = ss->sec.serverCert;
unsigned int certKeySize;
const ssl3BulkCipherDef *bulkCipher;
unsigned int requiredECCbits;
PORT_Assert(cert);
if (!cert || !cert->serverKeyPair || !cert->serverKeyPair->pubKey) {
PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
return NULL;
}
if (SSL_CERT_IS(cert, ssl_auth_rsa_sign) ||
SSL_CERT_IS(cert, ssl_auth_rsa_pss)) {
certKeySize = SECKEY_PublicKeyStrengthInBits(cert->serverKeyPair->pubKey);
certKeySize = SSL_RSASTRENGTH_TO_ECSTRENGTH(certKeySize);
} else if (SSL_CERT_IS_EC(cert)) {
/* We won't select a certificate unless the named curve has been
* negotiated (or supported_curves was absent), double check that. */
PORT_Assert(cert->namedCurve->keaType == ssl_kea_ecdh);
PORT_Assert(ssl_NamedGroupEnabled(ss, cert->namedCurve));
if (!ssl_NamedGroupEnabled(ss, cert->namedCurve)) {
return NULL;
}
certKeySize = cert->namedCurve->bits;
} else {
PORT_Assert(0);
return NULL;
}
bulkCipher = ssl_GetBulkCipherDef(ss->ssl3.hs.suite_def);
requiredECCbits = bulkCipher->key_size * BPB * 2;
PORT_Assert(requiredECCbits ||
ss->ssl3.hs.suite_def->bulk_cipher_alg == cipher_null);
if (requiredECCbits > certKeySize) {
requiredECCbits = certKeySize;
}
return ssl_GetECGroupWithStrength(ss, requiredECCbits);
}
/* ssl_CreateECDHEPrivateKey is a variant of SECKEY_CreateECPrivateKey that
* tries to use CKM_NSS_ECDHE_NO_PAIRWISE_CHECK_KEY_PAIR_GEN instead of CKM_EC_KEY_PAIR_GEN.
* Softoken's implementation of CKM_EC_KEY_PAIR_GEN always performs the
* SP800-56A pairwise consistency check, even though Section 5.6.2.1.4 of that
* document only requires that check for static keys. The
* CKM_NSS_ECDHE_NO_PAIRWISE_CHECK_KEY_PAIR_GEN mechanism skips the pairwise consistency
* check, but is otherwise identical to CKM_EC_KEY_PAIR_GEN. */
static SECKEYPrivateKey *
ssl_CreateECDHEPrivateKey(SECKEYECParams *param, SECKEYPublicKey **pubk, void *cx)
{
SECKEYPrivateKey *privk = NULL;
CK_MECHANISM_TYPE type = CKM_NSS_ECDHE_NO_PAIRWISE_CHECK_KEY_PAIR_GEN;
PK11SlotInfo *slot = PK11_GetInternalSlot();
if (!slot || !PK11_DoesMechanism(slot, type) || PK11_IsFIPS()) {
if (slot) {
PK11_FreeSlot(slot);
}
return SECKEY_CreateECPrivateKey(param, pubk, cx);
}
privk = PK11_GenerateKeyPairWithOpFlags(slot, type, param, pubk,
PK11_ATTR_SESSION | PK11_ATTR_INSENSITIVE | PK11_ATTR_PUBLIC,
CKF_DERIVE, CKF_DERIVE, cx);
if (!privk) {
privk = PK11_GenerateKeyPairWithOpFlags(slot, type, param, pubk,
PK11_ATTR_SESSION | PK11_ATTR_SENSITIVE | PK11_ATTR_PRIVATE,
CKF_DERIVE, CKF_DERIVE, cx);
}
PK11_FreeSlot(slot);
return privk;
}
/* Create an ECDHE key pair for a given curve */
SECStatus
ssl_CreateECDHEphemeralKeyPair(const sslSocket *ss,
const sslNamedGroupDef *ecGroup,
sslEphemeralKeyPair **keyPair)
{
SECKEYPrivateKey *privKey = NULL;
SECKEYPublicKey *pubKey = NULL;
SECKEYECParams ecParams = { siBuffer, NULL, 0 };
sslEphemeralKeyPair *pair;
if (ssl_NamedGroup2ECParams(NULL, ecGroup, &ecParams) != SECSuccess) {
return SECFailure;
}
privKey = ssl_CreateECDHEPrivateKey(&ecParams, &pubKey, ss->pkcs11PinArg);
SECITEM_FreeItem(&ecParams, PR_FALSE);
if (!privKey || !pubKey ||
!(pair = ssl_NewEphemeralKeyPair(ecGroup, privKey, pubKey))) {
if (privKey) {
SECKEY_DestroyPrivateKey(privKey);
}
if (pubKey) {
SECKEY_DestroyPublicKey(pubKey);
}
ssl_MapLowLevelError(SEC_ERROR_KEYGEN_FAIL);
return SECFailure;
}
*keyPair = pair;
SSL_TRC(50, ("%d: SSL[%d]: Create ECDH ephemeral key %d",
SSL_GETPID(), ss ? ss->fd : NULL, ecGroup->name));
PRINT_BUF(50, (ss, "Public Key", pubKey->u.ec.publicValue.data,
pubKey->u.ec.publicValue.len));
#ifdef TRACE
if (ssl_trace >= 50) {
SECItem d = { siBuffer, NULL, 0 };
SECStatus rv = PK11_ReadRawAttribute(PK11_TypePrivKey, privKey,
CKA_VALUE, &d);
if (rv == SECSuccess) {
PRINT_BUF(50, (ss, "Private Key", d.data, d.len));
SECITEM_FreeItem(&d, PR_FALSE);
} else {
SSL_TRC(50, ("Error extracting private key"));
}
}
#endif
return SECSuccess;
}
SECStatus
ssl3_HandleECDHServerKeyExchange(sslSocket *ss, PRUint8 *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) {
errCode = PORT_GetError();
goto alert_loser; /* malformed or unsupported. */
}
rv = ssl_CheckSignatureSchemeConsistency(
ss, sigScheme, &ss->sec.peerCert->subjectPublicKeyInfo);
if (rv != SECSuccess) {
errCode = PORT_GetError();
goto alert_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(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;
}
SECStatus
ssl3_SendECDHServerKeyExchange(sslSocket *ss)
{
SECStatus rv = SECFailure;
int length;
PRBool isTLS12;
SECItem signed_hash = { siBuffer, NULL, 0 };
SSLHashType hashAlg;
SSL3Hashes hashes;
SECItem ec_params = { siBuffer, NULL, 0 };
unsigned char paramBuf[3];
const sslNamedGroupDef *ecGroup;
sslEphemeralKeyPair *keyPair;
SECKEYPublicKey *pubKey;
/* Generate ephemeral ECDH key pair and send the public key */
ecGroup = ssl_GetECGroupForServerSocket(ss);
if (!ecGroup) {
goto loser;
}
PORT_Assert(PR_CLIST_IS_EMPTY(&ss->ephemeralKeyPairs));
if (ss->opt.reuseServerECDHEKey) {
rv = ssl_CreateStaticECDHEKey(ss, ecGroup);
if (rv != SECSuccess) {
goto loser;
}
keyPair = (sslEphemeralKeyPair *)PR_NEXT_LINK(&ss->ephemeralKeyPairs);
} else {
rv = ssl_CreateECDHEphemeralKeyPair(ss, ecGroup, &keyPair);
if (rv != SECSuccess) {
goto loser;
}
PR_APPEND_LINK(&keyPair->link, &ss->ephemeralKeyPairs);
}
PORT_Assert(keyPair);
if (!keyPair) {
PORT_SetError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
return SECFailure;
}
ec_params.len = sizeof(paramBuf);
ec_params.data = paramBuf;
PORT_Assert(keyPair->group);
PORT_Assert(keyPair->group->keaType == ssl_kea_ecdh);
ec_params.data[0] = ec_type_named;
ec_params.data[1] = keyPair->group->name >> 8;
ec_params.data[2] = keyPair->group->name & 0xff;
pubKey = keyPair->keys->pubKey;
if (ss->version == SSL_LIBRARY_VERSION_TLS_1_2) {
hashAlg = ssl_SignatureSchemeToHashType(ss->ssl3.hs.signatureScheme);
} else {
/* Use ssl_hash_none to represent the MD5+SHA1 combo. */
hashAlg = ssl_hash_none;
}
rv = ssl3_ComputeECDHKeyHash(hashAlg, ec_params,
pubKey->u.ec.publicValue,
ss->ssl3.hs.client_random,
ss->ssl3.hs.server_random,
&hashes);
if (rv != SECSuccess) {
ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
goto loser;
}
isTLS12 = (PRBool)(ss->version >= SSL_LIBRARY_VERSION_TLS_1_2);
rv = ssl3_SignHashes(ss, &hashes,
ss->sec.serverCert->serverKeyPair->privKey, &signed_hash);
if (rv != SECSuccess) {
goto loser; /* ssl3_SignHashes has set err. */
}
length = ec_params.len +
1 + pubKey->u.ec.publicValue.len +
(isTLS12 ? 2 : 0) + 2 + signed_hash.len;
rv = ssl3_AppendHandshakeHeader(ss, ssl_hs_server_key_exchange, length);
if (rv != SECSuccess) {
goto loser; /* err set by AppendHandshake. */
}
rv = ssl3_AppendHandshake(ss, ec_params.data, ec_params.len);
if (rv != SECSuccess) {
goto loser; /* err set by AppendHandshake. */
}
rv = ssl3_AppendHandshakeVariable(ss, pubKey->u.ec.publicValue.data,
pubKey->u.ec.publicValue.len, 1);
if (rv != SECSuccess) {
goto loser; /* err set by AppendHandshake. */
}
if (isTLS12) {
rv = ssl3_AppendHandshakeNumber(ss, ss->ssl3.hs.signatureScheme, 2);
if (rv != SECSuccess) {
goto loser; /* err set by AppendHandshake. */
}
}
rv = ssl3_AppendHandshakeVariable(ss, signed_hash.data,
signed_hash.len, 2);
if (rv != SECSuccess) {
goto loser; /* err set by AppendHandshake. */
}
PORT_Free(signed_hash.data);
return SECSuccess;
loser:
if (signed_hash.data != NULL)
PORT_Free(signed_hash.data);
return SECFailure;
}
/* List of all ECC cipher suites */
static const ssl3CipherSuite ssl_all_ec_suites[] = {
TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
TLS_ECDHE_ECDSA_WITH_NULL_SHA,
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
TLS_ECDHE_RSA_WITH_NULL_SHA,
TLS_ECDHE_RSA_WITH_RC4_128_SHA,
TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,
TLS_ECDH_ECDSA_WITH_NULL_SHA,
TLS_ECDH_ECDSA_WITH_RC4_128_SHA,
TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
TLS_ECDH_RSA_WITH_NULL_SHA,
TLS_ECDH_RSA_WITH_RC4_128_SHA,
0 /* end of list marker */
};
static const ssl3CipherSuite ssl_dhe_suites[] = {
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
TLS_DHE_DSS_WITH_AES_128_GCM_SHA256,
TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
TLS_DHE_DSS_WITH_AES_128_CBC_SHA,
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_DHE_DSS_WITH_AES_128_CBC_SHA256,
TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA,
TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA,
TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
TLS_DHE_DSS_WITH_AES_256_CBC_SHA,
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,
TLS_DHE_DSS_WITH_AES_256_CBC_SHA256,
TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA,
TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA,
TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA,
TLS_DHE_DSS_WITH_RC4_128_SHA,
TLS_DHE_RSA_WITH_DES_CBC_SHA,
TLS_DHE_DSS_WITH_DES_CBC_SHA,
0
};
/* Order(N^2). Yuk. */
static PRBool
ssl_IsSuiteEnabled(const sslSocket *ss, const ssl3CipherSuite *list)
{
const ssl3CipherSuite *suite;
for (suite = list; *suite; ++suite) {
PRBool enabled = PR_FALSE;
SECStatus rv = ssl3_CipherPrefGet(ss, *suite, &enabled);
PORT_Assert(rv == SECSuccess); /* else is coding error */
if (rv == SECSuccess && enabled)
return PR_TRUE;
}
return PR_FALSE;
}
/* Ask: is ANY ECC cipher suite enabled on this socket? */
PRBool
ssl_IsECCEnabled(const sslSocket *ss)
{
PK11SlotInfo *slot;
/* make sure we can do ECC */
slot = PK11_GetBestSlot(CKM_ECDH1_DERIVE, ss->pkcs11PinArg);
if (!slot) {
return PR_FALSE;
}
PK11_FreeSlot(slot);
/* make sure an ECC cipher is enabled */
return ssl_IsSuiteEnabled(ss, ssl_all_ec_suites);
}
PRBool
ssl_IsDHEEnabled(const sslSocket *ss)
{
return ssl_IsSuiteEnabled(ss, ssl_dhe_suites);
}
/* Send our Supported Groups extension. */
SECStatus
ssl_SendSupportedGroupsXtn(const sslSocket *ss, TLSExtensionData *xtnData,
sslBuffer *buf, PRBool *added)
{
unsigned int i;
PRBool ec;
PRBool ec_hybrid = PR_FALSE;
PRBool ff = PR_FALSE;
PRBool found = PR_FALSE;
SECStatus rv;
unsigned int lengthOffset;
/* We only send FF supported groups if we require DH named groups
* or if TLS 1.3 is a possibility. */
if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3) {
ec = ssl_IsECCEnabled(ss);
if (ss->opt.requireDHENamedGroups) {
ff = ssl_IsDHEEnabled(ss);
}
if (!ec && !ff) {
return SECSuccess;
}
} else {
ec = ec_hybrid = ff = PR_TRUE;
}
/* Mark the location of the length. */
rv = sslBuffer_Skip(buf, 2, &lengthOffset);
if (rv != SECSuccess) {
return SECFailure;
}
for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
const sslNamedGroupDef *group = ss->namedGroupPreferences[i];
if (!group) {
continue;
}
if (group->keaType == ssl_kea_ecdh && !ec) {
continue;
}
if (group->keaType == ssl_kea_ecdh_hybrid && !ec_hybrid) {
continue;
}
if (group->keaType == ssl_kea_dh && !ff) {
continue;
}
found = PR_TRUE;
rv = sslBuffer_AppendNumber(buf, group->name, 2);
if (rv != SECSuccess) {
return SECFailure;
}
}
/* GREASE SupportedGroups:
* A client MAY select one or more GREASE named group values and advertise
* them in the "supported_groups" extension, if sent [RFC8701, Section 3.1].
*/
if (!ss->sec.isServer &&
ss->opt.enableGrease &&
ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3) {
rv = sslBuffer_AppendNumber(buf, ss->ssl3.hs.grease->idx[grease_group], 2);
if (rv != SECSuccess) {
return SECFailure;
}
found = PR_TRUE;
}
if (!found) {
/* We added nothing, don't send the extension. */
return SECSuccess;
}
rv = sslBuffer_InsertLength(buf, lengthOffset, 2);
if (rv != SECSuccess) {
return SECFailure;
}
*added = PR_TRUE;
return SECSuccess;
}
/* Send our "canned" (precompiled) Supported Point Formats extension,
* which says that we only support uncompressed points.
*/
SECStatus
ssl3_SendSupportedPointFormatsXtn(const sslSocket *ss, TLSExtensionData *xtnData,
sslBuffer *buf, PRBool *added)
{
SECStatus rv;
/* No point in doing this unless we have a socket that supports ECC.
* Similarly, no point if we are going to do TLS 1.3 only or we have already
* picked TLS 1.3 (server) given that it doesn't use point formats. */
if (!ss || !ssl_IsECCEnabled(ss) ||
ss->vrange.min >= SSL_LIBRARY_VERSION_TLS_1_3 ||
(ss->sec.isServer && ss->version >= SSL_LIBRARY_VERSION_TLS_1_3)) {
return SECSuccess;
}
rv = sslBuffer_AppendNumber(buf, 1, 1); /* length */
if (rv != SECSuccess) {
return SECFailure;
}
rv = sslBuffer_AppendNumber(buf, 0, 1); /* uncompressed type only */
if (rv != SECSuccess) {
return SECFailure;
}
*added = PR_TRUE;
return SECSuccess;
}
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