/* -*- 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(sslSocket *ss, SECKEYPublicKey *peerKey, PRUint8 *b, PRUint32 length, const sslNamedGroupDef *ecGroup) { SECStatus rv; SECItem ecPoint = { siBuffer, NULL, 0 }; PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); 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); } /* 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 = SECKEY_CreateECPrivateKey(&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); 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(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; } 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 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 = 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_dh && !ff) { continue; } found = PR_TRUE; rv = sslBuffer_AppendNumber(buf, group->name, 2); if (rv != SECSuccess) { return SECFailure; } } 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; }