/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* * TLS 1.3 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/. */ #include "stdarg.h" #include "cert.h" #include "ssl.h" #include "keyhi.h" #include "pk11func.h" #include "prerr.h" #include "secitem.h" #include "secmod.h" #include "sslimpl.h" #include "sslproto.h" #include "sslerr.h" #include "tls13hkdf.h" #include "tls13con.h" #include "tls13exthandle.h" typedef enum { TrafficKeyClearText = 0, TrafficKeyEarlyApplicationData = 1, TrafficKeyHandshake = 2, TrafficKeyApplicationData = 3 } TrafficKeyType; typedef enum { CipherSpecRead, CipherSpecWrite, } CipherSpecDirection; static SECStatus tls13_SetCipherSpec(sslSocket *ss, TrafficKeyType type, CipherSpecDirection install, PRBool deleteSecret); static SECStatus tls13_AESGCM( ssl3KeyMaterial *keys, PRBool doDecrypt, unsigned char *out, int *outlen, int maxout, const unsigned char *in, int inlen, const unsigned char *additionalData, int additionalDataLen); static SECStatus tls13_ChaCha20Poly1305( ssl3KeyMaterial *keys, PRBool doDecrypt, unsigned char *out, int *outlen, int maxout, const unsigned char *in, int inlen, const unsigned char *additionalData, int additionalDataLen); static SECStatus tls13_SendServerHelloSequence(sslSocket *ss); static SECStatus tls13_SendEncryptedExtensions(sslSocket *ss); static void tls13_SetKeyExchangeType(sslSocket *ss, const sslNamedGroupDef *group); static SECStatus tls13_HandleClientKeyShare(sslSocket *ss, TLS13KeyShareEntry *peerShare); static SECStatus tls13_SendHelloRetryRequest(sslSocket *ss, const sslNamedGroupDef *selectedGroup); static SECStatus tls13_HandleServerKeyShare(sslSocket *ss); static SECStatus tls13_HandleEncryptedExtensions(sslSocket *ss, PRUint8 *b, PRUint32 length); static SECStatus tls13_SendCertificate(sslSocket *ss); static SECStatus tls13_HandleCertificate( sslSocket *ss, PRUint8 *b, PRUint32 length); static SECStatus tls13_HandleCertificateRequest(sslSocket *ss, PRUint8 *b, PRUint32 length); static SECStatus tls13_SendCertificateVerify(sslSocket *ss, SECKEYPrivateKey *privKey); static SECStatus tls13_HandleCertificateVerify( sslSocket *ss, PRUint8 *b, PRUint32 length, SSL3Hashes *hashes); static SECStatus tls13_RecoverWrappedSharedSecret(sslSocket *ss, sslSessionID *sid); static SECStatus tls13_DeriveSecret(sslSocket *ss, PK11SymKey *key, const char *prefix, const char *suffix, const SSL3Hashes *hashes, PK11SymKey **dest); static SECStatus tls13_SendEndOfEarlyData(sslSocket *ss); static SECStatus tls13_SendFinished(sslSocket *ss, PK11SymKey *baseKey); static SECStatus tls13_ComputePskBinderHash(sslSocket *ss, unsigned long prefixLength, SSL3Hashes *hashes); static SECStatus tls13_VerifyFinished(sslSocket *ss, SSL3HandshakeType message, PK11SymKey *secret, PRUint8 *b, PRUint32 length, const SSL3Hashes *hashes); static SECStatus tls13_ClientHandleFinished(sslSocket *ss, PRUint8 *b, PRUint32 length, const SSL3Hashes *hashes); static SECStatus tls13_ServerHandleFinished(sslSocket *ss, PRUint8 *b, PRUint32 length, const SSL3Hashes *hashes); static SECStatus tls13_HandleNewSessionTicket(sslSocket *ss, PRUint8 *b, PRUint32 length); static SECStatus tls13_ComputeHandshakeHashes(sslSocket *ss, SSL3Hashes *hashes); static SECStatus tls13_ComputeEarlySecrets(sslSocket *ss); static SECStatus tls13_ComputeHandshakeSecrets(sslSocket *ss); static SECStatus tls13_ComputeApplicationSecrets(sslSocket *ss); static SECStatus tls13_ComputeFinalSecrets(sslSocket *ss); static SECStatus tls13_ComputeFinished( sslSocket *ss, PK11SymKey *baseKey, const SSL3Hashes *hashes, PRBool sending, PRUint8 *output, unsigned int *outputLen, unsigned int maxOutputLen); static SECStatus tls13_SendClientSecondRound(sslSocket *ss); static SECStatus tls13_FinishHandshake(sslSocket *ss); const char kHkdfLabelClient[] = "client"; const char kHkdfLabelServer[] = "server"; const char kHkdfLabelPskBinderKey[] = "resumption psk binder key"; const char kHkdfLabelEarlyTrafficSecret[] = "early traffic secret"; const char kHkdfLabelEarlyExporterSecret[] = "early exporter master secret"; const char kHkdfLabelHandshakeTrafficSecret[] = "handshake traffic secret"; const char kHkdfLabelApplicationTrafficSecret[] = "application traffic secret"; const char kHkdfLabelFinishedSecret[] = "finished"; const char kHkdfLabelResumptionMasterSecret[] = "resumption master secret"; const char kHkdfLabelExporterMasterSecret[] = "exporter master secret"; const char kHkdfPurposeKey[] = "key"; const char kHkdfPurposeIv[] = "iv"; #define TRAFFIC_SECRET(ss, dir, name) ((ss->sec.isServer ^ \ (dir == CipherSpecWrite)) \ ? ss->ssl3.hs.client##name \ : ss->ssl3.hs.server##name) const SSL3ProtocolVersion kTlsRecordVersion = SSL_LIBRARY_VERSION_TLS_1_0; const SSL3ProtocolVersion kDtlsRecordVersion = SSL_LIBRARY_VERSION_TLS_1_1; /* Belt and suspenders in case we ever add a TLS 1.4. */ PR_STATIC_ASSERT(SSL_LIBRARY_VERSION_MAX_SUPPORTED <= SSL_LIBRARY_VERSION_TLS_1_3); /* Use this instead of FATAL_ERROR when no alert shall be sent. */ #define LOG_ERROR(ss, prError) \ do { \ SSL_TRC(3, ("%d: TLS13[%d]: fatal error %d in %s (%s:%d)", \ SSL_GETPID(), ss->fd, prError, __func__, __FILE__, __LINE__)); \ PORT_SetError(prError); \ } while (0) /* Log an error and generate an alert because something is irreparably wrong. */ #define FATAL_ERROR(ss, prError, desc) \ do { \ LOG_ERROR(ss, prError); \ tls13_FatalError(ss, prError, desc); \ } while (0) void tls13_FatalError(sslSocket *ss, PRErrorCode prError, SSL3AlertDescription desc) { PORT_Assert(desc != internal_error); /* These should never happen */ (void)SSL3_SendAlert(ss, alert_fatal, desc); PORT_SetError(prError); } #ifdef TRACE #define STATE_CASE(a) \ case a: \ return #a static char * tls13_HandshakeState(SSL3WaitState st) { switch (st) { STATE_CASE(idle_handshake); STATE_CASE(wait_client_hello); STATE_CASE(wait_client_cert); STATE_CASE(wait_client_key); STATE_CASE(wait_cert_verify); STATE_CASE(wait_change_cipher); STATE_CASE(wait_finished); STATE_CASE(wait_server_hello); STATE_CASE(wait_certificate_status); STATE_CASE(wait_server_cert); STATE_CASE(wait_server_key); STATE_CASE(wait_cert_request); STATE_CASE(wait_hello_done); STATE_CASE(wait_new_session_ticket); STATE_CASE(wait_encrypted_extensions); default: break; } PORT_Assert(0); return "unknown"; } #endif #define TLS13_WAIT_STATE_MASK 0x80 #define TLS13_BASE_WAIT_STATE(ws) (ws & ~TLS13_WAIT_STATE_MASK) /* We don't mask idle_handshake because other parts of the code use it*/ #define TLS13_WAIT_STATE(ws) (((ws == idle_handshake) || (ws == wait_server_hello)) ? ws : ws | TLS13_WAIT_STATE_MASK) #define TLS13_CHECK_HS_STATE(ss, err, ...) \ tls13_CheckHsState(ss, err, #err, __func__, __FILE__, __LINE__, \ __VA_ARGS__, \ wait_invalid) void tls13_SetHsState(sslSocket *ss, SSL3WaitState ws, const char *func, const char *file, int line) { #ifdef TRACE const char *new_state_name = tls13_HandshakeState(ws); SSL_TRC(3, ("%d: TLS13[%d]: %s state change from %s->%s in %s (%s:%d)", SSL_GETPID(), ss->fd, SSL_ROLE(ss), tls13_HandshakeState(TLS13_BASE_WAIT_STATE(ss->ssl3.hs.ws)), new_state_name, func, file, line)); #endif ss->ssl3.hs.ws = TLS13_WAIT_STATE(ws); } static PRBool tls13_InHsStateV(sslSocket *ss, va_list ap) { SSL3WaitState ws; while ((ws = va_arg(ap, SSL3WaitState)) != wait_invalid) { if (TLS13_WAIT_STATE(ws) == ss->ssl3.hs.ws) { return PR_TRUE; } } return PR_FALSE; } PRBool tls13_InHsState(sslSocket *ss, ...) { PRBool found; va_list ap; va_start(ap, ss); found = tls13_InHsStateV(ss, ap); va_end(ap); return found; } static SECStatus tls13_CheckHsState(sslSocket *ss, int err, const char *error_name, const char *func, const char *file, int line, ...) { va_list ap; va_start(ap, line); if (tls13_InHsStateV(ss, ap)) { va_end(ap); return SECSuccess; } va_end(ap); SSL_TRC(3, ("%d: TLS13[%d]: error %s state is (%s) at %s (%s:%d)", SSL_GETPID(), ss->fd, error_name, tls13_HandshakeState(TLS13_BASE_WAIT_STATE(ss->ssl3.hs.ws)), func, file, line)); tls13_FatalError(ss, err, unexpected_message); return SECFailure; } SSLHashType tls13_GetHashForCipherSuite(ssl3CipherSuite suite) { const ssl3CipherSuiteDef *cipherDef = ssl_LookupCipherSuiteDef(suite); PORT_Assert(cipherDef); if (!cipherDef) { return ssl_hash_none; } return cipherDef->prf_hash; } SSLHashType tls13_GetHash(const sslSocket *ss) { /* All TLS 1.3 cipher suites must have an explict PRF hash. */ PORT_Assert(ss->ssl3.hs.suite_def->prf_hash != ssl_hash_none); return ss->ssl3.hs.suite_def->prf_hash; } unsigned int tls13_GetHashSizeForHash(SSLHashType hash) { switch (hash) { case ssl_hash_sha256: return 32; case ssl_hash_sha384: return 48; default: PORT_Assert(0); } return 32; } unsigned int tls13_GetHashSize(const sslSocket *ss) { return tls13_GetHashSizeForHash(tls13_GetHash(ss)); } static CK_MECHANISM_TYPE tls13_GetHkdfMechanismForHash(SSLHashType hash) { switch (hash) { case ssl_hash_sha256: return CKM_NSS_HKDF_SHA256; case ssl_hash_sha384: return CKM_NSS_HKDF_SHA384; default: PORT_Assert(0); } return CKM_NSS_HKDF_SHA256; } CK_MECHANISM_TYPE tls13_GetHkdfMechanism(sslSocket *ss) { return tls13_GetHkdfMechanismForHash(tls13_GetHash(ss)); } static CK_MECHANISM_TYPE tls13_GetHmacMechanism(sslSocket *ss) { switch (tls13_GetHash(ss)) { case ssl_hash_sha256: return CKM_SHA256_HMAC; case ssl_hash_sha384: return CKM_SHA384_HMAC; default: PORT_Assert(0); } return CKM_SHA256_HMAC; } SECStatus tls13_CreateKeyShare(sslSocket *ss, const sslNamedGroupDef *groupDef) { SECStatus rv; sslEphemeralKeyPair *keyPair = NULL; const ssl3DHParams *params; PORT_Assert(groupDef); switch (groupDef->keaType) { case ssl_kea_ecdh: rv = ssl_CreateECDHEphemeralKeyPair(ss, groupDef, &keyPair); if (rv != SECSuccess) { return SECFailure; } break; case ssl_kea_dh: params = ssl_GetDHEParams(groupDef); PORT_Assert(params->name != ssl_grp_ffdhe_custom); rv = ssl_CreateDHEKeyPair(groupDef, params, &keyPair); if (rv != SECSuccess) { return SECFailure; } break; default: PORT_Assert(0); PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } PR_APPEND_LINK(&keyPair->link, &ss->ephemeralKeyPairs); return rv; } SECStatus SSL_SendAdditionalKeyShares(PRFileDesc *fd, unsigned int count) { sslSocket *ss = ssl_FindSocket(fd); if (!ss) { PORT_SetError(SEC_ERROR_INVALID_ARGS); return SECFailure; } ss->additionalShares = count; return SECSuccess; } /* * Generate shares for ECDHE and FFDHE. This picks the first enabled group of * the requisite type and creates a share for that. * * Called from ssl3_SendClientHello. */ SECStatus tls13_SetupClientHello(sslSocket *ss) { unsigned int i; SSL3Statistics *ssl3stats = SSL_GetStatistics(); NewSessionTicket *session_ticket = NULL; sslSessionID *sid = ss->sec.ci.sid; unsigned int numShares = 0; PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss)); PORT_Assert(PR_CLIST_IS_EMPTY(&ss->ephemeralKeyPairs)); /* Select the first enabled group. * TODO(ekr@rtfm.com): be smarter about offering the group * that the other side negotiated if we are resuming. */ for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) { SECStatus rv; if (!ss->namedGroupPreferences[i]) { continue; } rv = tls13_CreateKeyShare(ss, ss->namedGroupPreferences[i]); if (rv != SECSuccess) { return SECFailure; } if (++numShares > ss->additionalShares) { break; } } if (PR_CLIST_IS_EMPTY(&ss->ephemeralKeyPairs)) { PORT_SetError(SSL_ERROR_NO_CIPHERS_SUPPORTED); return SECFailure; } /* Below here checks if we can do stateless resumption. */ if (sid->cached == never_cached || sid->version < SSL_LIBRARY_VERSION_TLS_1_3) { return SECSuccess; } /* The caller must be holding sid->u.ssl3.lock for reading. */ session_ticket = &sid->u.ssl3.locked.sessionTicket; PORT_Assert(session_ticket && session_ticket->ticket.data); if (ssl_TicketTimeValid(session_ticket)) { ss->statelessResume = PR_TRUE; } if (ss->statelessResume) { SECStatus rv; PORT_Assert(ss->sec.ci.sid); rv = tls13_RecoverWrappedSharedSecret(ss, ss->sec.ci.sid); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); SSL_AtomicIncrementLong(&ssl3stats->sch_sid_cache_not_ok); ss->sec.uncache(ss->sec.ci.sid); ssl_FreeSID(ss->sec.ci.sid); ss->sec.ci.sid = NULL; return SECFailure; } rv = ssl3_SetCipherSuite(ss, ss->sec.ci.sid->u.ssl3.cipherSuite, PR_FALSE); if (rv != SECSuccess) { FATAL_ERROR(ss, PORT_GetError(), internal_error); return SECFailure; } rv = tls13_ComputeEarlySecrets(ss); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } } return SECSuccess; } static SECStatus tls13_ImportDHEKeyShare(sslSocket *ss, SECKEYPublicKey *peerKey, PRUint8 *b, PRUint32 length, SECKEYPublicKey *pubKey) { SECStatus rv; SECItem publicValue = { siBuffer, NULL, 0 }; publicValue.data = b; publicValue.len = length; if (!ssl_IsValidDHEShare(&pubKey->u.dh.prime, &publicValue)) { PORT_SetError(SSL_ERROR_RX_MALFORMED_DHE_KEY_SHARE); return SECFailure; } peerKey->keyType = dhKey; rv = SECITEM_CopyItem(peerKey->arena, &peerKey->u.dh.prime, &pubKey->u.dh.prime); if (rv != SECSuccess) return SECFailure; rv = SECITEM_CopyItem(peerKey->arena, &peerKey->u.dh.base, &pubKey->u.dh.base); if (rv != SECSuccess) return SECFailure; rv = SECITEM_CopyItem(peerKey->arena, &peerKey->u.dh.publicValue, &publicValue); if (rv != SECSuccess) return SECFailure; return SECSuccess; } static SECStatus tls13_HandleKeyShare(sslSocket *ss, TLS13KeyShareEntry *entry, sslKeyPair *keyPair) { PORTCheapArenaPool arena; SECKEYPublicKey *peerKey; CK_MECHANISM_TYPE mechanism; PRErrorCode errorCode; SECStatus rv; PORT_InitCheapArena(&arena, DER_DEFAULT_CHUNKSIZE); peerKey = PORT_ArenaZNew(&arena.arena, SECKEYPublicKey); if (peerKey == NULL) { goto loser; } peerKey->arena = &arena.arena; peerKey->pkcs11Slot = NULL; peerKey->pkcs11ID = CK_INVALID_HANDLE; switch (entry->group->keaType) { case ssl_kea_ecdh: rv = ssl_ImportECDHKeyShare(ss, peerKey, entry->key_exchange.data, entry->key_exchange.len, entry->group); mechanism = CKM_ECDH1_DERIVE; break; case ssl_kea_dh: rv = tls13_ImportDHEKeyShare(ss, peerKey, entry->key_exchange.data, entry->key_exchange.len, keyPair->pubKey); mechanism = CKM_DH_PKCS_DERIVE; break; default: PORT_Assert(0); goto loser; } if (rv != SECSuccess) { goto loser; } ss->ssl3.hs.dheSecret = PK11_PubDeriveWithKDF( keyPair->privKey, peerKey, PR_FALSE, NULL, NULL, mechanism, tls13_GetHkdfMechanism(ss), CKA_DERIVE, 0, CKD_NULL, NULL, NULL); if (!ss->ssl3.hs.dheSecret) { ssl_MapLowLevelError(SSL_ERROR_KEY_EXCHANGE_FAILURE); goto loser; } PORT_DestroyCheapArena(&arena); return SECSuccess; loser: PORT_DestroyCheapArena(&arena); errorCode = PORT_GetError(); /* don't overwrite the error code */ tls13_FatalError(ss, errorCode, illegal_parameter); return SECFailure; } SECStatus tls13_HandlePostHelloHandshakeMessage(sslSocket *ss, PRUint8 *b, PRUint32 length, SSL3Hashes *hashesPtr) { if (ss->sec.isServer && ss->ssl3.hs.zeroRttIgnore != ssl_0rtt_ignore_none) { SSL_TRC(3, ("%d: TLS13[%d]: %s successfully decrypted handshake after" "failed 0-RTT", SSL_GETPID(), ss->fd)); ss->ssl3.hs.zeroRttIgnore = ssl_0rtt_ignore_none; } /* TODO(ekr@rtfm.com): Would it be better to check all the states here? */ switch (ss->ssl3.hs.msg_type) { case certificate: return tls13_HandleCertificate(ss, b, length); case certificate_request: return tls13_HandleCertificateRequest(ss, b, length); case certificate_verify: if (!hashesPtr) { FATAL_ERROR(ss, SSL_ERROR_RX_UNEXPECTED_CERT_VERIFY, unexpected_message); return SECFailure; } return tls13_HandleCertificateVerify(ss, b, length, hashesPtr); case encrypted_extensions: return tls13_HandleEncryptedExtensions(ss, b, length); case new_session_ticket: return tls13_HandleNewSessionTicket(ss, b, length); case finished: if (!hashesPtr) { FATAL_ERROR(ss, SSL_ERROR_RX_UNEXPECTED_FINISHED, unexpected_message); return SECFailure; } if (ss->sec.isServer) { return tls13_ServerHandleFinished(ss, b, length, hashesPtr); } else { return tls13_ClientHandleFinished(ss, b, length, hashesPtr); } default: FATAL_ERROR(ss, SSL_ERROR_RX_UNKNOWN_HANDSHAKE, unexpected_message); return SECFailure; } PORT_Assert(0); /* Unreached */ return SECFailure; } static SECStatus tls13_RecoverWrappedSharedSecret(sslSocket *ss, sslSessionID *sid) { PK11SymKey *wrapKey; /* wrapping key */ SECItem wrappedMS = { siBuffer, NULL, 0 }; SSLHashType hashType; SSL_TRC(3, ("%d: TLS13[%d]: recovering static secret (%s)", SSL_GETPID(), ss->fd, SSL_ROLE(ss))); if (!sid->u.ssl3.keys.msIsWrapped) { PORT_Assert(0); /* I think this can't happen. */ return SECFailure; } /* Now find the hash used as the PRF for the previous handshake. */ hashType = tls13_GetHashForCipherSuite(sid->u.ssl3.cipherSuite); /* If we are the server, we compute the wrapping key, but if we * are the client, its coordinates are stored with the ticket. */ if (ss->sec.isServer) { wrapKey = ssl3_GetWrappingKey(ss, NULL, sid->u.ssl3.masterWrapMech, ss->pkcs11PinArg); } else { PK11SlotInfo *slot = SECMOD_LookupSlot(sid->u.ssl3.masterModuleID, sid->u.ssl3.masterSlotID); if (!slot) return SECFailure; wrapKey = PK11_GetWrapKey(slot, sid->u.ssl3.masterWrapIndex, sid->u.ssl3.masterWrapMech, sid->u.ssl3.masterWrapSeries, ss->pkcs11PinArg); PK11_FreeSlot(slot); } if (!wrapKey) { return SECFailure; } wrappedMS.data = sid->u.ssl3.keys.wrapped_master_secret; wrappedMS.len = sid->u.ssl3.keys.wrapped_master_secret_len; /* unwrap the "master secret" which is actually RMS. */ ss->ssl3.hs.resumptionMasterSecret = PK11_UnwrapSymKeyWithFlags( wrapKey, sid->u.ssl3.masterWrapMech, NULL, &wrappedMS, CKM_SSL3_MASTER_KEY_DERIVE, CKA_DERIVE, tls13_GetHashSizeForHash(hashType), CKF_SIGN | CKF_VERIFY); PK11_FreeSymKey(wrapKey); if (!ss->ssl3.hs.resumptionMasterSecret) { return SECFailure; } PRINT_KEY(50, (ss, "Recovered RMS", ss->ssl3.hs.resumptionMasterSecret)); return SECSuccess; } /* Key Derivation Functions. * * Below is the key schedule from [draft-ietf-tls-tls13]. * * * The relevant functions from this file are indicated by tls13_Foo(). * 0 * | * v * PSK -> HKDF-Extract * | * v * Early Secret ---> Derive-Secret(., "client early traffic secret", * | ClientHello) * | = client_early_traffic_secret * v * (EC)DHE -> HKDF-Extract * | * v * Handshake Secret * | * +---------> Derive-Secret(., "client handshake traffic secret", * | ClientHello...ServerHello) * | = client_handshake_traffic_secret * | * +---------> Derive-Secret(., "server handshake traffic secret", * | ClientHello...ServerHello) * | = server_handshake_traffic_secret * | * v * 0 -> HKDF-Extract * | * v * Master Secret * | * +---------> Derive-Secret(., "client application traffic secret", * | ClientHello...Server Finished) * | = client_traffic_secret_0 * | * +---------> Derive-Secret(., "server application traffic secret", * | ClientHello...Server Finished) * | = server_traffic_secret_0 * | * +---------> Derive-Secret(., "exporter master secret", * | ClientHello...Client Finished) * | = exporter_secret * | * +---------> Derive-Secret(., "resumption master secret", * ClientHello...Client Finished) * = resumption_secret * */ static SECStatus tls13_ComputeEarlySecrets(sslSocket *ss) { SECStatus rv = SECSuccess; SSL_TRC(5, ("%d: TLS13[%d]: compute early secrets (%s)", SSL_GETPID(), ss->fd, SSL_ROLE(ss))); /* Extract off the resumptionMasterSecret (if present), else pass the NULL * resumptionMasterSecret which will be internally translated to zeroes. */ PORT_Assert(!ss->ssl3.hs.currentSecret); rv = tls13_HkdfExtract(NULL, ss->ssl3.hs.resumptionMasterSecret, tls13_GetHash(ss), &ss->ssl3.hs.currentSecret); if (rv != SECSuccess) { return SECFailure; } PORT_Assert(ss->statelessResume == (ss->ssl3.hs.resumptionMasterSecret != NULL)); if (ss->statelessResume) { PRUint8 buf[1] = { 0 }; SSL3Hashes hashes; PK11_FreeSymKey(ss->ssl3.hs.resumptionMasterSecret); ss->ssl3.hs.resumptionMasterSecret = NULL; rv = PK11_HashBuf(ssl3_HashTypeToOID(tls13_GetHash(ss)), hashes.u.raw, buf, 0); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } hashes.len = tls13_GetHashSize(ss); rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, NULL, kHkdfLabelPskBinderKey, &hashes, &ss->ssl3.hs.pskBinderKey); if (rv != SECSuccess) { return SECFailure; } rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, NULL, kHkdfLabelEarlyExporterSecret, &hashes, &ss->ssl3.hs.earlyExporterSecret); if (rv != SECSuccess) { return SECFailure; } } else { PORT_Assert(!ss->ssl3.hs.resumptionMasterSecret); } return SECSuccess; } static SECStatus tls13_ComputeHandshakeSecrets(sslSocket *ss) { SECStatus rv; PK11SymKey *newSecret = NULL; SSL_TRC(5, ("%d: TLS13[%d]: compute handshake secrets (%s)", SSL_GETPID(), ss->fd, SSL_ROLE(ss))); /* First update |currentSecret| to add |dheSecret|, if any. */ PORT_Assert(ss->ssl3.hs.currentSecret); PORT_Assert(ss->ssl3.hs.dheSecret); rv = tls13_HkdfExtract(ss->ssl3.hs.currentSecret, ss->ssl3.hs.dheSecret, tls13_GetHash(ss), &newSecret); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return rv; } PK11_FreeSymKey(ss->ssl3.hs.dheSecret); ss->ssl3.hs.dheSecret = NULL; PK11_FreeSymKey(ss->ssl3.hs.currentSecret); ss->ssl3.hs.currentSecret = newSecret; /* Now compute |*HsTrafficSecret| */ rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, kHkdfLabelClient, kHkdfLabelHandshakeTrafficSecret, NULL, &ss->ssl3.hs.clientHsTrafficSecret); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return rv; } rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, kHkdfLabelServer, kHkdfLabelHandshakeTrafficSecret, NULL, &ss->ssl3.hs.serverHsTrafficSecret); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return rv; } SSL_TRC(5, ("%d: TLS13[%d]: compute master secret (%s)", SSL_GETPID(), ss->fd, SSL_ROLE(ss))); /* Crank HKDF forward to make master secret, which we * stuff in current secret. */ rv = tls13_HkdfExtract(ss->ssl3.hs.currentSecret, NULL, tls13_GetHash(ss), &newSecret); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } PK11_FreeSymKey(ss->ssl3.hs.currentSecret); ss->ssl3.hs.currentSecret = newSecret; return SECSuccess; } static SECStatus tls13_ComputeApplicationSecrets(sslSocket *ss) { SECStatus rv; rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, kHkdfLabelClient, kHkdfLabelApplicationTrafficSecret, NULL, &ss->ssl3.hs.clientTrafficSecret); if (rv != SECSuccess) { return SECFailure; } rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, kHkdfLabelServer, kHkdfLabelApplicationTrafficSecret, NULL, &ss->ssl3.hs.serverTrafficSecret); if (rv != SECSuccess) { return SECFailure; } rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, NULL, kHkdfLabelExporterMasterSecret, NULL, &ss->ssl3.hs.exporterSecret); if (rv != SECSuccess) { return SECFailure; } return SECSuccess; } static SECStatus tls13_ComputeFinalSecrets(sslSocket *ss) { SECStatus rv; PK11SymKey *resumptionMasterSecret = NULL; PORT_Assert(!ss->ssl3.crSpec->master_secret); PORT_Assert(!ss->ssl3.cwSpec->master_secret); rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, NULL, kHkdfLabelResumptionMasterSecret, NULL, &resumptionMasterSecret); PK11_FreeSymKey(ss->ssl3.hs.currentSecret); ss->ssl3.hs.currentSecret = NULL; if (rv != SECSuccess) { return SECFailure; } /* This is pretty gross. TLS 1.3 uses a number of master secrets: * The master secret to generate the keys and then the resumption * master secret for future connections. To make this work without * refactoring too much of the SSLv3 code, we store the RMS in * |crSpec->master_secret| and |cwSpec->master_secret|. */ ss->ssl3.crSpec->master_secret = resumptionMasterSecret; ss->ssl3.cwSpec->master_secret = PK11_ReferenceSymKey(ss->ssl3.crSpec->master_secret); return SECSuccess; } static void tls13_RestoreCipherInfo(sslSocket *ss, sslSessionID *sid) { /* Set these to match the cached value. * TODO(ekr@rtfm.com): Make a version with the "true" values. * Bug 1256137. */ ss->sec.authType = sid->authType; ss->sec.authKeyBits = sid->authKeyBits; } /* Check whether resumption-PSK is allowed. */ static PRBool tls13_CanResume(sslSocket *ss, const sslSessionID *sid) { const sslServerCert *sc; if (!sid) { return PR_FALSE; } if (sid->version != ss->version) { return PR_FALSE; } if (tls13_GetHashForCipherSuite(sid->u.ssl3.cipherSuite) != tls13_GetHashForCipherSuite(ss->ssl3.hs.cipher_suite)) { return PR_FALSE; } /* Server sids don't remember the server cert we previously sent, but they * do remember the type of certificate we originally used, so we can locate * it again, provided that the current ssl socket has had its server certs * configured the same as the previous one. */ sc = ssl_FindServerCert(ss, sid->authType, sid->namedCurve); if (!sc || !sc->serverCert) { return PR_FALSE; } return PR_TRUE; } static PRBool tls13_CanNegotiateZeroRtt(sslSocket *ss, const sslSessionID *sid) { PORT_Assert(ss->ssl3.hs.zeroRttState == ssl_0rtt_sent); if (!sid) return PR_FALSE; PORT_Assert(ss->statelessResume); if (!ss->statelessResume) return PR_FALSE; if (ss->ssl3.hs.cipher_suite != sid->u.ssl3.cipherSuite) return PR_FALSE; if (!ss->opt.enable0RttData) return PR_FALSE; if (!(sid->u.ssl3.locked.sessionTicket.flags & ticket_allow_early_data)) return PR_FALSE; if (SECITEM_CompareItem(&ss->xtnData.nextProto, &sid->u.ssl3.alpnSelection) != 0) return PR_FALSE; return PR_TRUE; } /* Called from tls13_HandleClientHelloPart2 to update the state of 0-RTT handling. * * 0-RTT is only permitted if: * 1. The early data extension was present. * 2. We are resuming a session. * 3. The 0-RTT option is set. * 4. The ticket allowed 0-RTT. * 5. We negotiated the same ALPN value as in the ticket. */ static void tls13_NegotiateZeroRtt(sslSocket *ss, const sslSessionID *sid) { SSL_TRC(3, ("%d: TLS13[%d]: negotiate 0-RTT %p", SSL_GETPID(), ss->fd, sid)); /* tls13_ServerHandleEarlyDataXtn sets this to ssl_0rtt_sent, so this will * be ssl_0rtt_none unless early_data is present. */ if (ss->ssl3.hs.zeroRttState == ssl_0rtt_none) { return; } /* If we rejected 0-RTT on the first ClientHello, then we can just say that * there is no 0-RTT for the second. We shouldn't get any more. Reset the * ignore state so that we treat decryption failure normally. */ if (ss->ssl3.hs.zeroRttIgnore == ssl_0rtt_ignore_hrr) { PORT_Assert(ss->ssl3.hs.helloRetry); ss->ssl3.hs.zeroRttState = ssl_0rtt_none; ss->ssl3.hs.zeroRttIgnore = ssl_0rtt_ignore_none; return; } if (!tls13_CanNegotiateZeroRtt(ss, sid)) { SSL_TRC(3, ("%d: TLS13[%d]: ignore 0-RTT", SSL_GETPID(), ss->fd)); ss->ssl3.hs.zeroRttState = ssl_0rtt_ignored; ss->ssl3.hs.zeroRttIgnore = ssl_0rtt_ignore_trial; return; } SSL_TRC(3, ("%d: TLS13[%d]: enable 0-RTT", SSL_GETPID(), ss->fd)); PORT_Assert(ss->statelessResume); ss->ssl3.hs.zeroRttState = ssl_0rtt_accepted; ss->ssl3.hs.zeroRttIgnore = ssl_0rtt_ignore_none; } /* Check if the offered group is acceptable. */ static PRBool tls13_isGroupAcceptable(const sslNamedGroupDef *offered, const sslNamedGroupDef *preferredGroup) { /* We accept epsilon (e) bits around the offered group size. */ const unsigned int e = 2; PORT_Assert(offered); PORT_Assert(preferredGroup); if (offered->bits >= preferredGroup->bits - e && offered->bits <= preferredGroup->bits + e) { return PR_TRUE; } return PR_FALSE; } /* Find remote key share for given group and return it. * Returns NULL if no key share is found. */ static TLS13KeyShareEntry * tls13_FindKeyShareEntry(sslSocket *ss, const sslNamedGroupDef *group) { PRCList *cur_p = PR_NEXT_LINK(&ss->xtnData.remoteKeyShares); while (cur_p != &ss->xtnData.remoteKeyShares) { TLS13KeyShareEntry *offer = (TLS13KeyShareEntry *)cur_p; if (offer->group == group) { return offer; } cur_p = PR_NEXT_LINK(cur_p); } return NULL; } static SECStatus tls13_NegotiateKeyExchange(sslSocket *ss, TLS13KeyShareEntry **clientShare) { unsigned int index; TLS13KeyShareEntry *entry = NULL; const sslNamedGroupDef *preferredGroup = NULL; /* We insist on DHE. */ if (ss->statelessResume) { if (!ssl3_ExtensionNegotiated(ss, ssl_tls13_psk_key_exchange_modes_xtn)) { FATAL_ERROR(ss, SSL_ERROR_MISSING_PSK_KEY_EXCHANGE_MODES, missing_extension); return SECFailure; } if (!memchr(ss->xtnData.psk_ke_modes.data, tls13_psk_dh_ke, ss->xtnData.psk_ke_modes.len)) { SSL_TRC(3, ("%d: TLS13[%d]: client offered PSK without DH", SSL_GETPID(), ss->fd)); ss->statelessResume = PR_FALSE; } } /* Now figure out which key share we like the best out of the * mutually supported groups, regardless of what the client offered * for key shares. */ if (!ssl3_ExtensionNegotiated(ss, ssl_supported_groups_xtn)) { FATAL_ERROR(ss, SSL_ERROR_MISSING_SUPPORTED_GROUPS_EXTENSION, missing_extension); return SECFailure; } SSL_TRC(3, ("%d: TLS13[%d]: selected KE = %s", SSL_GETPID(), ss->fd, ss->statelessResume ? "PSK + (EC)DHE" : "(EC)DHE")); /* Find the preferred group and an according client key share available. */ for (index = 0; index < SSL_NAMED_GROUP_COUNT; ++index) { /* Continue to the next group if this one is not enabled. */ if (!ss->namedGroupPreferences[index]) { /* There's a gap in the preferred groups list. Assume this is a group * that's not supported by the client but preferred by the server. */ if (preferredGroup) { entry = NULL; break; } continue; } /* Check if the client sent a key share for this group. */ entry = tls13_FindKeyShareEntry(ss, ss->namedGroupPreferences[index]); if (preferredGroup) { /* We already found our preferred group but the group didn't have a share. */ if (entry) { /* The client sent a key share with group ss->namedGroupPreferences[index] */ if (tls13_isGroupAcceptable(ss->namedGroupPreferences[index], preferredGroup)) { /* This is not the preferred group, but it's acceptable */ preferredGroup = ss->namedGroupPreferences[index]; } else { /* The proposed group is not acceptable. */ entry = NULL; } } break; } else { /* The first enabled group is the preferred group. */ preferredGroup = ss->namedGroupPreferences[index]; if (entry) { break; } } } if (!preferredGroup) { FATAL_ERROR(ss, SSL_ERROR_NO_CYPHER_OVERLAP, handshake_failure); return SECFailure; } SSL_TRC(3, ("%d: TLS13[%d]: group = %d", SSL_GETPID(), ss->fd, preferredGroup->name)); if (!entry) { return tls13_SendHelloRetryRequest(ss, preferredGroup); } PORT_Assert(preferredGroup == entry->group); *clientShare = entry; return SECSuccess; } SSLAuthType ssl_SignatureSchemeToAuthType(SSLSignatureScheme scheme) { switch (scheme) { case ssl_sig_rsa_pkcs1_sha1: case ssl_sig_rsa_pkcs1_sha256: case ssl_sig_rsa_pkcs1_sha384: case ssl_sig_rsa_pkcs1_sha512: /* We report PSS signatures as being just RSA signatures. */ case ssl_sig_rsa_pss_sha256: case ssl_sig_rsa_pss_sha384: case ssl_sig_rsa_pss_sha512: return ssl_auth_rsa_sign; case ssl_sig_ecdsa_secp256r1_sha256: case ssl_sig_ecdsa_secp384r1_sha384: case ssl_sig_ecdsa_secp521r1_sha512: case ssl_sig_ecdsa_sha1: return ssl_auth_ecdsa; default: PORT_Assert(0); } return ssl_auth_null; } SECStatus tls13_SelectServerCert(sslSocket *ss) { PRCList *cursor; SECStatus rv; if (!ssl3_ExtensionNegotiated(ss, ssl_signature_algorithms_xtn)) { FATAL_ERROR(ss, SSL_ERROR_MISSING_SIGNATURE_ALGORITHMS_EXTENSION, missing_extension); return SECFailure; } /* This picks the first certificate that has: * a) the right authentication method, and * b) the right named curve (EC only) * * We might want to do some sort of ranking here later. For now, it's all * based on what order they are configured in. */ for (cursor = PR_NEXT_LINK(&ss->serverCerts); cursor != &ss->serverCerts; cursor = PR_NEXT_LINK(cursor)) { sslServerCert *cert = (sslServerCert *)cursor; if (SSL_CERT_IS_ONLY(cert, ssl_auth_rsa_decrypt)) { continue; } rv = ssl_PickSignatureScheme(ss, cert->serverKeyPair->pubKey, cert->serverKeyPair->privKey, ss->xtnData.clientSigSchemes, ss->xtnData.numClientSigScheme, PR_FALSE); if (rv == SECSuccess) { /* Found one. */ ss->sec.serverCert = cert; ss->sec.authType = ss->ssl3.hs.kea_def_mutable.authKeyType = ssl_SignatureSchemeToAuthType(ss->ssl3.hs.signatureScheme); ss->sec.authKeyBits = cert->serverKeyBits; return SECSuccess; } } FATAL_ERROR(ss, SSL_ERROR_UNSUPPORTED_SIGNATURE_ALGORITHM, handshake_failure); return SECFailure; } static SECStatus tls13_NegotiateAuthentication(sslSocket *ss) { SECStatus rv; if (ss->statelessResume) { SSL_TRC(3, ("%d: TLS13[%d]: selected PSK authentication", SSL_GETPID(), ss->fd)); ss->ssl3.hs.signatureScheme = ssl_sig_none; ss->ssl3.hs.kea_def_mutable.authKeyType = ssl_auth_psk; return SECSuccess; } SSL_TRC(3, ("%d: TLS13[%d]: selected certificate authentication", SSL_GETPID(), ss->fd)); /* We've now established that we need to sign.... */ rv = tls13_SelectServerCert(ss); if (rv != SECSuccess) { return SECFailure; } return SECSuccess; } /* Called from ssl3_HandleClientHello after we have parsed the * ClientHello and are sure that we are going to do TLS 1.3 * or fail. */ SECStatus tls13_HandleClientHelloPart2(sslSocket *ss, const SECItem *suites, sslSessionID *sid) { SECStatus rv; SSL3Statistics *ssl3stats = SSL_GetStatistics(); TLS13KeyShareEntry *clientShare = NULL; int j; ssl3CipherSuite previousCipherSuite; if (ssl3_ExtensionNegotiated(ss, ssl_tls13_early_data_xtn)) { ss->ssl3.hs.zeroRttState = ssl_0rtt_sent; } #ifndef PARANOID /* Look for a matching cipher suite. */ j = ssl3_config_match_init(ss); if (j <= 0) { /* no ciphers are working/supported by PK11 */ FATAL_ERROR(ss, PORT_GetError(), internal_error); goto loser; } #endif previousCipherSuite = ss->ssl3.hs.cipher_suite; rv = ssl3_NegotiateCipherSuite(ss, suites, PR_FALSE); if (rv != SECSuccess) { FATAL_ERROR(ss, SSL_ERROR_NO_CYPHER_OVERLAP, handshake_failure); goto loser; } /* If we are going around again, then we should make sure that the cipher * suite selection doesn't change. That's a sign of client shennanigans. */ if (ss->ssl3.hs.helloRetry && ss->ssl3.hs.cipher_suite != previousCipherSuite) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, handshake_failure); goto loser; } /* Now create a synthetic kea_def that we can tweak. */ ss->ssl3.hs.kea_def_mutable = *ss->ssl3.hs.kea_def; ss->ssl3.hs.kea_def = &ss->ssl3.hs.kea_def_mutable; /* Note: We call this quite a bit earlier than with TLS 1.2 and * before. */ rv = ssl3_ServerCallSNICallback(ss); if (rv != SECSuccess) { goto loser; /* An alert has already been sent. */ } /* Check if we could in principle resume. */ if (ss->statelessResume) { PORT_Assert(sid); if (!sid) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } if (!tls13_CanResume(ss, sid)) { ss->statelessResume = PR_FALSE; } } /* Select key exchange. */ rv = tls13_NegotiateKeyExchange(ss, &clientShare); if (rv != SECSuccess) { goto loser; } /* If we didn't find a client key share, we have to retry. */ if (!clientShare) { if (sid) { /* Free the sid. */ ss->sec.uncache(sid); ssl_FreeSID(sid); } PORT_Assert(ss->ssl3.hs.helloRetry); return SECSuccess; } /* Select the authentication (this is also handshake shape). */ rv = tls13_NegotiateAuthentication(ss); if (rv != SECSuccess) { goto loser; } if (ss->statelessResume) { /* We are now committed to trying to resume. */ PORT_Assert(sid); /* Check that the negotiated SNI and the cached SNI match. */ if (SECITEM_CompareItem(&sid->u.ssl3.srvName, &ss->ssl3.hs.srvVirtName) != SECEqual) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, handshake_failure); goto loser; } ss->sec.serverCert = ssl_FindServerCert(ss, sid->authType, sid->namedCurve); PORT_Assert(ss->sec.serverCert); rv = tls13_RecoverWrappedSharedSecret(ss, sid); if (rv != SECSuccess) { SSL_AtomicIncrementLong(&ssl3stats->hch_sid_cache_not_ok); FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); goto loser; } tls13_RestoreCipherInfo(ss, sid); ss->sec.localCert = CERT_DupCertificate(ss->sec.serverCert->serverCert); if (sid->peerCert != NULL) { ss->sec.peerCert = CERT_DupCertificate(sid->peerCert); } ssl3_RegisterExtensionSender( ss, &ss->xtnData, ssl_tls13_pre_shared_key_xtn, tls13_ServerSendPreSharedKeyXtn); tls13_NegotiateZeroRtt(ss, sid); } else { if (sid) { /* we had a sid, but it's no longer valid, free it */ SSL_AtomicIncrementLong(&ssl3stats->hch_sid_cache_not_ok); if (ss->sec.uncache) ss->sec.uncache(sid); ssl_FreeSID(sid); sid = NULL; } tls13_NegotiateZeroRtt(ss, NULL); } /* Need to compute early secrets. */ rv = tls13_ComputeEarlySecrets(ss); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } /* Now that we have the binder key check the binder. */ if (ss->statelessResume) { SSL3Hashes hashes; rv = tls13_ComputePskBinderHash(ss, ss->xtnData.pskBinderPrefixLen, &hashes); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); goto loser; } rv = tls13_VerifyFinished(ss, client_hello, ss->ssl3.hs.pskBinderKey, ss->xtnData.pskBinder.data, ss->xtnData.pskBinder.len, &hashes); if (rv != SECSuccess) { goto loser; } } /* This needs to go after we verify the psk binder. */ rv = ssl3_InitHandshakeHashes(ss); if (rv != SECSuccess) { goto loser; } /* If this is TLS 1.3 we are expecting a ClientKeyShare * extension. Missing/absent extension cause failure * below. */ rv = tls13_HandleClientKeyShare(ss, clientShare); if (rv != SECSuccess) { goto loser; /* An alert was sent already. */ } /* From this point we are either committed to resumption, or not. */ if (ss->statelessResume) { SSL_AtomicIncrementLong(&ssl3stats->hch_sid_cache_hits); SSL_AtomicIncrementLong(&ssl3stats->hch_sid_stateless_resumes); } else { if (sid) { /* We had a sid, but it's no longer valid, free it. */ SSL_AtomicIncrementLong(&ssl3stats->hch_sid_cache_not_ok); ss->sec.uncache(sid); ssl_FreeSID(sid); } else { SSL_AtomicIncrementLong(&ssl3stats->hch_sid_cache_misses); } sid = ssl3_NewSessionID(ss, PR_TRUE); if (!sid) { FATAL_ERROR(ss, PORT_GetError(), internal_error); return SECFailure; } } /* Take ownership of the session. */ ss->sec.ci.sid = sid; sid = NULL; if (ss->ssl3.hs.zeroRttState == ssl_0rtt_accepted) { rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, kHkdfLabelClient, kHkdfLabelEarlyTrafficSecret, NULL, /* Current running hash. */ &ss->ssl3.hs.clientEarlyTrafficSecret); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } } ssl_GetXmitBufLock(ss); rv = tls13_SendServerHelloSequence(ss); ssl_ReleaseXmitBufLock(ss); if (rv != SECSuccess) { FATAL_ERROR(ss, PORT_GetError(), handshake_failure); return SECFailure; } return SECSuccess; loser: if (sid) { ss->sec.uncache(sid); ssl_FreeSID(sid); } return SECFailure; } static SECStatus tls13_SendHelloRetryRequest(sslSocket *ss, const sslNamedGroupDef *selectedGroup) { SECStatus rv; SSL_TRC(3, ("%d: TLS13[%d]: send hello retry request handshake", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); /* We asked already, but made no progress. */ if (ss->ssl3.hs.helloRetry) { FATAL_ERROR(ss, SSL_ERROR_BAD_2ND_CLIENT_HELLO, illegal_parameter); return SECFailure; } ssl_GetXmitBufLock(ss); rv = ssl3_AppendHandshakeHeader(ss, hello_retry_request, 2 + /* version */ 2 + /* extension length */ 2 + /* group extension id */ 2 + /* group extension length */ 2 /* group */); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); goto loser; } rv = ssl3_AppendHandshakeNumber( ss, tls13_EncodeDraftVersion(ss->version), 2); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); goto loser; } /* Length of extensions. */ rv = ssl3_AppendHandshakeNumber(ss, 2 + 2 + 2, 2); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); goto loser; } /* Key share extension - currently the only reason we send this. */ rv = ssl3_AppendHandshakeNumber(ss, ssl_tls13_key_share_xtn, 2); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); goto loser; } /* Key share extension length. */ rv = ssl3_AppendHandshakeNumber(ss, 2, 2); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); goto loser; } rv = ssl3_AppendHandshakeNumber(ss, selectedGroup->name, 2); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); goto loser; } rv = ssl3_FlushHandshake(ss, 0); if (rv != SECSuccess) { goto loser; /* error code set by ssl3_FlushHandshake */ } ssl_ReleaseXmitBufLock(ss); ss->ssl3.hs.helloRetry = PR_TRUE; /* We received early data but have to ignore it because we sent a retry. */ if (ss->ssl3.hs.zeroRttState == ssl_0rtt_sent) { ss->ssl3.hs.zeroRttState = ssl_0rtt_ignored; ss->ssl3.hs.zeroRttIgnore = ssl_0rtt_ignore_hrr; } return SECSuccess; loser: ssl_ReleaseXmitBufLock(ss); return SECFailure; } /* Called from tls13_HandleClientHello. * * Caller must hold Handshake and RecvBuf locks. */ static SECStatus tls13_HandleClientKeyShare(sslSocket *ss, TLS13KeyShareEntry *peerShare) { SECStatus rv; sslEphemeralKeyPair *keyPair; /* ours */ SSL_TRC(3, ("%d: TLS13[%d]: handle client_key_share handshake", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); PORT_Assert(peerShare); tls13_SetKeyExchangeType(ss, peerShare->group); /* Generate our key */ rv = tls13_CreateKeyShare(ss, peerShare->group); if (rv != SECSuccess) { return rv; } /* We should have exactly one key share. */ PORT_Assert(!PR_CLIST_IS_EMPTY(&ss->ephemeralKeyPairs)); PORT_Assert(PR_PREV_LINK(&ss->ephemeralKeyPairs) == PR_NEXT_LINK(&ss->ephemeralKeyPairs)); keyPair = ((sslEphemeralKeyPair *)PR_NEXT_LINK(&ss->ephemeralKeyPairs)); ss->sec.keaKeyBits = SECKEY_PublicKeyStrengthInBits(keyPair->keys->pubKey); /* Register the sender */ rv = ssl3_RegisterExtensionSender(ss, &ss->xtnData, ssl_tls13_key_share_xtn, tls13_ServerSendKeyShareXtn); if (rv != SECSuccess) { return SECFailure; /* Error code set already. */ } rv = tls13_HandleKeyShare(ss, peerShare, keyPair->keys); return rv; /* Error code set already. */ } /* * [draft-ietf-tls-tls13-11] Section 6.3.3.2 * * opaque DistinguishedName<1..2^16-1>; * * struct { * opaque certificate_extension_oid<1..2^8-1>; * opaque certificate_extension_values<0..2^16-1>; * } CertificateExtension; * * struct { * opaque certificate_request_context<0..2^8-1>; * SignatureAndHashAlgorithm * supported_signature_algorithms<2..2^16-2>; * DistinguishedName certificate_authorities<0..2^16-1>; * CertificateExtension certificate_extensions<0..2^16-1>; * } CertificateRequest; */ static SECStatus tls13_SendCertificateRequest(sslSocket *ss) { SECStatus rv; unsigned int calen; SECItem *names; unsigned int nnames; SECItem *name; int i; PRUint8 sigSchemes[MAX_SIGNATURE_SCHEMES * 2]; unsigned int sigSchemesLength = 0; int length; SSL_TRC(3, ("%d: TLS13[%d]: begin send certificate_request", SSL_GETPID(), ss->fd)); rv = ssl3_EncodeSigAlgs(ss, sigSchemes, sizeof(sigSchemes), &sigSchemesLength); if (rv != SECSuccess) { return rv; } rv = ssl_GetCertificateRequestCAs(ss, &calen, &names, &nnames); if (rv != SECSuccess) { return rv; } length = 1 + 0 /* length byte for empty request context */ + 2 + sigSchemesLength + 2 + calen + 2; rv = ssl3_AppendHandshakeHeader(ss, certificate_request, length); if (rv != SECSuccess) { return rv; /* err set by AppendHandshake. */ } rv = ssl3_AppendHandshakeNumber(ss, 0, 1); if (rv != SECSuccess) { return rv; /* err set by AppendHandshake. */ } rv = ssl3_AppendHandshakeVariable(ss, sigSchemes, sigSchemesLength, 2); if (rv != SECSuccess) { return rv; /* err set by AppendHandshake. */ } rv = ssl3_AppendHandshakeNumber(ss, calen, 2); if (rv != SECSuccess) { return rv; /* err set by AppendHandshake. */ } for (i = 0, name = names; i < nnames; i++, name++) { rv = ssl3_AppendHandshakeVariable(ss, name->data, name->len, 2); if (rv != SECSuccess) { return rv; /* err set by AppendHandshake. */ } } rv = ssl3_AppendHandshakeNumber(ss, 0, 2); if (rv != SECSuccess) { return rv; /* err set by AppendHandshake. */ } return SECSuccess; } SECStatus tls13_HandleHelloRetryRequest(sslSocket *ss, PRUint8 *b, PRUint32 length) { SECStatus rv; PRUint32 tmp; SSL3ProtocolVersion version; SSL_TRC(3, ("%d: TLS13[%d]: handle hello retry request", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3) { FATAL_ERROR(ss, SSL_ERROR_RX_UNEXPECTED_HELLO_RETRY_REQUEST, unexpected_message); return SECFailure; } /* Client only. */ rv = TLS13_CHECK_HS_STATE(ss, SSL_ERROR_RX_UNEXPECTED_HELLO_RETRY_REQUEST, wait_server_hello); if (rv != SECSuccess) { return SECFailure; } /* Fool me once, shame on you; fool me twice... */ if (ss->ssl3.hs.helloRetry) { FATAL_ERROR(ss, SSL_ERROR_RX_UNEXPECTED_HELLO_RETRY_REQUEST, unexpected_message); return SECFailure; } if (ss->ssl3.hs.zeroRttState == ssl_0rtt_sent) { ss->ssl3.hs.zeroRttState = ssl_0rtt_ignored; /* Restore the null cipher spec for writing. */ ssl_GetSpecWriteLock(ss); tls13_CipherSpecRelease(ss->ssl3.cwSpec); ss->ssl3.cwSpec = ss->ssl3.crSpec; PORT_Assert(ss->ssl3.cwSpec->cipher_def->cipher == cipher_null); ssl_ReleaseSpecWriteLock(ss); } else { PORT_Assert(ss->ssl3.hs.zeroRttState == ssl_0rtt_none); } /* Version. */ rv = ssl_ClientReadVersion(ss, &b, &length, &version); if (rv != SECSuccess) { return SECFailure; /* alert already sent */ } if (version > ss->vrange.max || version < SSL_LIBRARY_VERSION_TLS_1_3) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_HELLO_RETRY_REQUEST, protocol_version); return SECFailure; } /* Extensions. */ rv = ssl3_ConsumeHandshakeNumber(ss, &tmp, 2, &b, &length); if (rv != SECSuccess) { return SECFailure; /* error code already set */ } /* Extensions must be non-empty and use the remainder of the message. * This means that a HelloRetryRequest cannot be a no-op: we must have an * extension, it must be one that we understand and recognize as being valid * for HelloRetryRequest, and all the extensions we permit cause us to * modify our ClientHello in some way. */ if (!tmp || tmp != length) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_HELLO_RETRY_REQUEST, decode_error); return SECFailure; } rv = ssl3_HandleExtensions(ss, &b, &length, hello_retry_request); if (rv != SECSuccess) { return SECFailure; /* Error code set below */ } ss->ssl3.hs.helloRetry = PR_TRUE; ssl_GetXmitBufLock(ss); rv = ssl3_SendClientHello(ss, client_hello_retry); ssl_ReleaseXmitBufLock(ss); if (rv != SECSuccess) { return SECFailure; } return SECSuccess; } static SECStatus tls13_HandleCertificateRequest(sslSocket *ss, PRUint8 *b, PRUint32 length) { SECStatus rv; TLS13CertificateRequest *certRequest = NULL; SECItem context = { siBuffer, NULL, 0 }; PLArenaPool *arena; SECItem extensionsData = { siBuffer, NULL, 0 }; SSL_TRC(3, ("%d: TLS13[%d]: handle certificate_request sequence", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); /* Client */ rv = TLS13_CHECK_HS_STATE(ss, SSL_ERROR_RX_UNEXPECTED_CERT_REQUEST, wait_cert_request); if (rv != SECSuccess) { return SECFailure; } PORT_Assert(ss->ssl3.clientCertChain == NULL); PORT_Assert(ss->ssl3.clientCertificate == NULL); PORT_Assert(ss->ssl3.clientPrivateKey == NULL); PORT_Assert(ss->ssl3.hs.certificateRequest == NULL); arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE); if (!arena) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } rv = ssl3_ConsumeHandshakeVariable(ss, &context, 1, &b, &length); if (rv != SECSuccess) goto loser; /* We don't support post-handshake client auth, the certificate request * context must always be null. */ if (context.len > 0) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CERT_REQUEST, illegal_parameter); goto loser; } certRequest = PORT_ArenaZNew(arena, TLS13CertificateRequest); if (!certRequest) goto loser; certRequest->arena = arena; certRequest->ca_list.arena = arena; rv = ssl_ParseSignatureSchemes(ss, arena, &certRequest->signatureSchemes, &certRequest->signatureSchemeCount, &b, &length); if (rv != SECSuccess || certRequest->signatureSchemeCount == 0) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CERT_REQUEST, decode_error); goto loser; } rv = ssl3_ParseCertificateRequestCAs(ss, &b, &length, arena, &certRequest->ca_list); if (rv != SECSuccess) goto loser; /* alert already sent */ /* Verify that the extensions are sane. */ rv = ssl3_ConsumeHandshakeVariable(ss, &extensionsData, 2, &b, &length); if (rv != SECSuccess) { goto loser; } /* Process all the extensions (note: currently a no-op). */ rv = ssl3_HandleExtensions(ss, &extensionsData.data, &extensionsData.len, certificate_request); if (rv != SECSuccess) { goto loser; } rv = SECITEM_CopyItem(arena, &certRequest->context, &context); if (rv != SECSuccess) goto loser; TLS13_SET_HS_STATE(ss, wait_server_cert); ss->ssl3.hs.certificateRequest = certRequest; return SECSuccess; loser: PORT_FreeArena(arena, PR_FALSE); return SECFailure; } static SECStatus tls13_SendEncryptedServerSequence(sslSocket *ss) { SECStatus rv; rv = tls13_ComputeHandshakeSecrets(ss); if (rv != SECSuccess) { return SECFailure; /* error code is set. */ } rv = tls13_SetCipherSpec(ss, TrafficKeyHandshake, CipherSpecWrite, PR_FALSE); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } ss->ssl3.hs.shortHeaders = ssl3_ExtensionNegotiated( ss, ssl_tls13_short_header_xtn); if (ss->ssl3.hs.zeroRttState == ssl_0rtt_accepted) { rv = ssl3_RegisterExtensionSender(ss, &ss->xtnData, ssl_tls13_early_data_xtn, tls13_ServerSendEarlyDataXtn); if (rv != SECSuccess) { return SECFailure; /* Error code set already. */ } } rv = tls13_SendEncryptedExtensions(ss); if (rv != SECSuccess) { return SECFailure; /* error code is set. */ } if (ss->opt.requestCertificate) { rv = tls13_SendCertificateRequest(ss); if (rv != SECSuccess) { return SECFailure; /* error code is set. */ } } if (ss->ssl3.hs.signatureScheme != ssl_sig_none) { SECKEYPrivateKey *svrPrivKey; rv = tls13_SendCertificate(ss); if (rv != SECSuccess) { return SECFailure; /* error code is set. */ } svrPrivKey = ss->sec.serverCert->serverKeyPair->privKey; rv = tls13_SendCertificateVerify(ss, svrPrivKey); if (rv != SECSuccess) { return SECFailure; /* err code is set. */ } } rv = tls13_SendFinished(ss, ss->ssl3.hs.serverHsTrafficSecret); if (rv != SECSuccess) { return SECFailure; /* error code is set. */ } return SECSuccess; } /* Called from: ssl3_HandleClientHello */ static SECStatus tls13_SendServerHelloSequence(sslSocket *ss) { SECStatus rv; PRErrorCode err = 0; SSL_TRC(3, ("%d: TLS13[%d]: begin send server_hello sequence", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss)); rv = ssl3_SendServerHello(ss); if (rv != SECSuccess) { return rv; /* err code is set. */ } rv = tls13_SendEncryptedServerSequence(ss); if (rv != SECSuccess) { err = PORT_GetError(); } /* Even if we get an error, since the ServerHello was successfully * serialized, we should give it a chance to reach the network. This gives * the client a chance to perform the key exchange and decrypt the alert * we're about to send. */ rv |= ssl3_FlushHandshake(ss, 0); if (rv != SECSuccess) { if (err) { PORT_SetError(err); } return SECFailure; } /* Compute the rest of the secrets except for the resumption * and exporter secret. */ rv = tls13_ComputeApplicationSecrets(ss); if (rv != SECSuccess) { LOG_ERROR(ss, PORT_GetError()); return SECFailure; } rv = tls13_SetCipherSpec(ss, TrafficKeyApplicationData, CipherSpecWrite, PR_FALSE); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } if (ss->ssl3.hs.zeroRttState == ssl_0rtt_accepted) { rv = tls13_SetCipherSpec(ss, TrafficKeyEarlyApplicationData, CipherSpecRead, PR_TRUE); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } } else { PORT_Assert(ss->ssl3.hs.zeroRttState == ssl_0rtt_none || ss->ssl3.hs.zeroRttState == ssl_0rtt_ignored); rv = tls13_SetCipherSpec(ss, TrafficKeyHandshake, CipherSpecRead, PR_FALSE); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } } TLS13_SET_HS_STATE(ss, ss->opt.requestCertificate ? wait_client_cert : wait_finished); return SECSuccess; } SECStatus tls13_HandleServerHelloPart2(sslSocket *ss) { SECStatus rv; sslSessionID *sid = ss->sec.ci.sid; SSL3Statistics *ssl3stats = SSL_GetStatistics(); if (ssl3_ExtensionNegotiated(ss, ssl_tls13_pre_shared_key_xtn)) { PORT_Assert(ss->statelessResume); } else { if (ss->ssl3.hs.currentSecret) { PORT_Assert(ss->statelessResume); PK11_FreeSymKey(ss->ssl3.hs.currentSecret); ss->ssl3.hs.currentSecret = NULL; } ss->statelessResume = PR_FALSE; } if (ss->statelessResume) { if (tls13_GetHash(ss) != tls13_GetHashForCipherSuite(sid->u.ssl3.cipherSuite)) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_SERVER_HELLO, illegal_parameter); return SECFailure; } } /* Now create a synthetic kea_def that we can tweak. */ ss->ssl3.hs.kea_def_mutable = *ss->ssl3.hs.kea_def; ss->ssl3.hs.kea_def = &ss->ssl3.hs.kea_def_mutable; if (ss->statelessResume) { /* PSK */ ss->ssl3.hs.kea_def_mutable.authKeyType = ssl_auth_psk; tls13_RestoreCipherInfo(ss, sid); if (sid->peerCert) { ss->sec.peerCert = CERT_DupCertificate(sid->peerCert); } SSL_AtomicIncrementLong(&ssl3stats->hsh_sid_cache_hits); SSL_AtomicIncrementLong(&ssl3stats->hsh_sid_stateless_resumes); } else { /* !PSK */ if (ssl3_ClientExtensionAdvertised(ss, ssl_tls13_pre_shared_key_xtn)) { SSL_AtomicIncrementLong(&ssl3stats->hsh_sid_cache_misses); } if (sid->cached == in_client_cache) { /* If we tried to resume and failed, let's not try again. */ ss->sec.uncache(sid); } } if (!ss->ssl3.hs.currentSecret) { PORT_Assert(!ss->statelessResume); /* If we don't already have the Early Secret we need to make it * now. */ rv = tls13_ComputeEarlySecrets(ss); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } } /* Discard current SID and make a new one, though it may eventually * end up looking a lot like the old one. */ ssl_FreeSID(sid); ss->sec.ci.sid = sid = ssl3_NewSessionID(ss, PR_FALSE); if (sid == NULL) { FATAL_ERROR(ss, PORT_GetError(), internal_error); return SECFailure; } if (ss->statelessResume) { PORT_Assert(ss->sec.peerCert); sid->peerCert = CERT_DupCertificate(ss->sec.peerCert); } sid->version = ss->version; rv = tls13_HandleServerKeyShare(ss); if (rv != SECSuccess) { return SECFailure; } rv = tls13_ComputeHandshakeSecrets(ss); if (rv != SECSuccess) { return SECFailure; /* error code is set. */ } ss->ssl3.hs.shortHeaders = ssl3_ExtensionNegotiated( ss, ssl_tls13_short_header_xtn); rv = tls13_SetCipherSpec(ss, TrafficKeyHandshake, CipherSpecRead, PR_FALSE); if (rv != SECSuccess) { FATAL_ERROR(ss, SSL_ERROR_INIT_CIPHER_SUITE_FAILURE, internal_error); return SECFailure; } TLS13_SET_HS_STATE(ss, wait_encrypted_extensions); return SECSuccess; } static void tls13_SetKeyExchangeType(sslSocket *ss, const sslNamedGroupDef *group) { ss->sec.keaGroup = group; switch (group->keaType) { /* Note: These overwrite on resumption.... so if you start with ECDH * and resume with DH, we report DH. That's fine, since no answer * is really right. */ case ssl_kea_ecdh: ss->ssl3.hs.kea_def_mutable.exchKeyType = ss->statelessResume ? ssl_kea_ecdh_psk : ssl_kea_ecdh; ss->sec.keaType = ssl_kea_ecdh; break; case ssl_kea_dh: ss->ssl3.hs.kea_def_mutable.exchKeyType = ss->statelessResume ? ssl_kea_dh_psk : ssl_kea_dh; ss->sec.keaType = ssl_kea_dh; break; default: PORT_Assert(0); } } /* * Called from ssl3_HandleServerHello. * * Caller must hold Handshake and RecvBuf locks. */ static SECStatus tls13_HandleServerKeyShare(sslSocket *ss) { SECStatus rv; TLS13KeyShareEntry *entry; sslEphemeralKeyPair *keyPair; SSL_TRC(3, ("%d: TLS13[%d]: handle server_key_share handshake", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); /* This list should have one entry. */ if (PR_CLIST_IS_EMPTY(&ss->xtnData.remoteKeyShares)) { FATAL_ERROR(ss, SSL_ERROR_MISSING_KEY_SHARE, missing_extension); return SECFailure; } entry = (TLS13KeyShareEntry *)PR_NEXT_LINK(&ss->xtnData.remoteKeyShares); PORT_Assert(PR_NEXT_LINK(&entry->link) == &ss->xtnData.remoteKeyShares); /* Now get our matching key. */ keyPair = ssl_LookupEphemeralKeyPair(ss, entry->group); if (!keyPair) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_KEY_SHARE, illegal_parameter); return SECFailure; } PORT_Assert(ssl_NamedGroupEnabled(ss, entry->group)); rv = tls13_HandleKeyShare(ss, entry, keyPair->keys); if (rv != SECSuccess) return SECFailure; /* Error code set by caller. */ tls13_SetKeyExchangeType(ss, entry->group); ss->sec.keaKeyBits = SECKEY_PublicKeyStrengthInBits(keyPair->keys->pubKey); return SECSuccess; } /* * opaque ASN1Cert<1..2^24-1>; * * struct { * ASN1Cert cert_data; * Extension extensions<0..2^16-1>; * } CertificateEntry; * * struct { * opaque certificate_request_context<0..2^8-1>; * CertificateEntry certificate_list<0..2^24-1>; * } Certificate; */ static SECStatus tls13_SendCertificate(sslSocket *ss) { SECStatus rv; CERTCertificateList *certChain; int certChainLen = 0; int i; SECItem context = { siBuffer, NULL, 0 }; PRInt32 extensionsLen = 0; PRUint32 maxBytes = 65535; SSL_TRC(3, ("%d: TLS1.3[%d]: send certificate handshake", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); if (ss->sec.isServer) { PORT_Assert(!ss->sec.localCert); /* A server certificate is selected in tls13_SelectServerCert(). */ PORT_Assert(ss->sec.serverCert); certChain = ss->sec.serverCert->serverCertChain; ss->sec.localCert = CERT_DupCertificate(ss->sec.serverCert->serverCert); } else { if (ss->sec.localCert) CERT_DestroyCertificate(ss->sec.localCert); certChain = ss->ssl3.clientCertChain; ss->sec.localCert = CERT_DupCertificate(ss->ssl3.clientCertificate); } /* Get the extensions length. This only applies to the leaf cert, * because we don't yet send extensions for non-leaf certs. */ extensionsLen = ssl3_CallHelloExtensionSenders( ss, PR_FALSE, maxBytes, &ss->xtnData.certificateSenders[0]); if (!ss->sec.isServer) { PORT_Assert(ss->ssl3.hs.certificateRequest); context = ss->ssl3.hs.certificateRequest->context; } if (certChain) { for (i = 0; i < certChain->len; i++) { certChainLen += 3 + certChain->certs[i].len + /* cert length + cert */ 2 + (!i ? extensionsLen : 0); /* extensions length + extensions */ } } rv = ssl3_AppendHandshakeHeader(ss, certificate, 1 + context.len + 3 + certChainLen); if (rv != SECSuccess) { return SECFailure; /* err set by AppendHandshake. */ } rv = ssl3_AppendHandshakeVariable(ss, context.data, context.len, 1); if (rv != SECSuccess) { return SECFailure; /* err set by AppendHandshake. */ } rv = ssl3_AppendHandshakeNumber(ss, certChainLen, 3); if (rv != SECSuccess) { return SECFailure; /* err set by AppendHandshake. */ } if (certChain) { for (i = 0; i < certChain->len; i++) { PRInt32 sentLen; rv = ssl3_AppendHandshakeVariable(ss, certChain->certs[i].data, certChain->certs[i].len, 3); if (rv != SECSuccess) { return SECFailure; /* err set by AppendHandshake. */ } if (i) { /* Not end-entity. */ rv = ssl3_AppendHandshakeNumber(ss, 0, 2); if (rv != SECSuccess) { return SECFailure; /* err set by AppendHandshake. */ } continue; } /* End-entity, send extensions. */ rv = ssl3_AppendHandshakeNumber(ss, extensionsLen, 2); if (rv != SECSuccess) { return SECFailure; /* err set by AppendHandshake. */ } sentLen = ssl3_CallHelloExtensionSenders( ss, PR_TRUE, extensionsLen, &ss->xtnData.certificateSenders[0]); PORT_Assert(sentLen == extensionsLen); if (sentLen != extensionsLen) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } } } return SECSuccess; } static SECStatus tls13_HandleCertificateEntry(sslSocket *ss, SECItem *data, PRBool first, CERTCertificate **certp) { SECStatus rv; SECItem certData; SECItem extensionsData; CERTCertificate *cert = NULL; rv = ssl3_ConsumeHandshakeVariable(ss, &certData, 3, &data->data, &data->len); if (rv != SECSuccess) { return SECFailure; } rv = ssl3_ConsumeHandshakeVariable(ss, &extensionsData, 2, &data->data, &data->len); if (rv != SECSuccess) { return SECFailure; } /* Parse all the extensions. */ if (first && !ss->sec.isServer) { rv = ssl3_HandleExtensions(ss, &extensionsData.data, &extensionsData.len, certificate); if (rv != SECSuccess) { return SECFailure; } /* TODO(ekr@rtfm.com): Copy out SCTs. Bug 1315727. */ } cert = CERT_NewTempCertificate(ss->dbHandle, &certData, NULL, PR_FALSE, PR_TRUE); if (!cert) { PRErrorCode errCode = PORT_GetError(); switch (errCode) { case PR_OUT_OF_MEMORY_ERROR: case SEC_ERROR_BAD_DATABASE: case SEC_ERROR_NO_MEMORY: FATAL_ERROR(ss, errCode, internal_error); return SECFailure; default: ssl3_SendAlertForCertError(ss, errCode); return SECFailure; } } *certp = cert; return SECSuccess; } /* Called from tls13_CompleteHandleHandshakeMessage() when it has deciphered a complete * tls13 Certificate message. * Caller must hold Handshake and RecvBuf locks. */ static SECStatus tls13_HandleCertificate(sslSocket *ss, PRUint8 *b, PRUint32 length) { SECStatus rv; SECItem context = { siBuffer, NULL, 0 }; SECItem certList; PRBool first = PR_TRUE; ssl3CertNode *lastCert = NULL; SSL_TRC(3, ("%d: TLS13[%d]: handle certificate handshake", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); if (ss->sec.isServer) { rv = TLS13_CHECK_HS_STATE(ss, SSL_ERROR_RX_UNEXPECTED_CERTIFICATE, wait_client_cert); } else { rv = TLS13_CHECK_HS_STATE(ss, SSL_ERROR_RX_UNEXPECTED_CERTIFICATE, wait_cert_request, wait_server_cert); } if (rv != SECSuccess) return SECFailure; /* Process the context string */ rv = ssl3_ConsumeHandshakeVariable(ss, &context, 1, &b, &length); if (rv != SECSuccess) return SECFailure; if (context.len) { /* The context string MUST be empty */ FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CERTIFICATE, illegal_parameter); return SECFailure; } rv = ssl3_ConsumeHandshakeVariable(ss, &certList, 3, &b, &length); if (rv != SECSuccess) { return SECFailure; } if (length) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CERTIFICATE, illegal_parameter); return SECFailure; } if (!certList.len) { if (!ss->sec.isServer) { /* Servers always need to send some cert. */ FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CERTIFICATE, bad_certificate); return SECFailure; } else { /* This is TLS's version of a no_certificate alert. */ /* I'm a server. I've requested a client cert. He hasn't got one. */ rv = ssl3_HandleNoCertificate(ss); if (rv != SECSuccess) { return SECFailure; } TLS13_SET_HS_STATE(ss, wait_finished); return SECSuccess; } } /* Now clean up. */ ssl3_CleanupPeerCerts(ss); ss->ssl3.peerCertArena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE); if (ss->ssl3.peerCertArena == NULL) { FATAL_ERROR(ss, SEC_ERROR_NO_MEMORY, internal_error); return SECFailure; } while (certList.len) { CERTCertificate *cert; rv = tls13_HandleCertificateEntry(ss, &certList, first, &cert); if (rv != SECSuccess) { ss->xtnData.signedCertTimestamps.len = 0; return SECFailure; } if (first) { ss->sec.peerCert = cert; if (ss->xtnData.signedCertTimestamps.len) { sslSessionID *sid = ss->sec.ci.sid; rv = SECITEM_CopyItem(NULL, &sid->u.ssl3.signedCertTimestamps, &ss->xtnData.signedCertTimestamps); ss->xtnData.signedCertTimestamps.len = 0; if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_NO_MEMORY, internal_error); return SECFailure; } } } else { ssl3CertNode *c = PORT_ArenaNew(ss->ssl3.peerCertArena, ssl3CertNode); if (!c) { FATAL_ERROR(ss, SEC_ERROR_NO_MEMORY, internal_error); return SECFailure; } c->cert = cert; c->next = NULL; if (lastCert) { lastCert->next = c; } else { ss->ssl3.peerCertChain = c; } lastCert = c; } first = PR_FALSE; } SECKEY_UpdateCertPQG(ss->sec.peerCert); return ssl3_AuthCertificate(ss); /* sets ss->ssl3.hs.ws */ } void tls13_CipherSpecAddRef(ssl3CipherSpec *spec) { ++spec->refCt; SSL_TRC(10, ("%d: TLS13[-]: Increment ref ct for spec %d. new ct = %d", SSL_GETPID(), spec, spec->refCt)); } /* This function is never called on a spec which is on the * cipherSpecs list. */ void tls13_CipherSpecRelease(ssl3CipherSpec *spec) { PORT_Assert(spec->refCt > 0); --spec->refCt; SSL_TRC(10, ("%d: TLS13[-]: decrement refct for spec %d. phase=%s new ct = %d", SSL_GETPID(), spec, spec->phase, spec->refCt)); if (!spec->refCt) { SSL_TRC(10, ("%d: TLS13[-]: Freeing spec %d. phase=%s", SSL_GETPID(), spec, spec->phase)); PR_REMOVE_LINK(&spec->link); ssl3_DestroyCipherSpec(spec, PR_TRUE); PORT_Free(spec); } } /* Add context to the hash functions as described in [draft-ietf-tls-tls13; Section 4.9.1] */ SECStatus tls13_AddContextToHashes(sslSocket *ss, const SSL3Hashes *hashes, SSLHashType algorithm, PRBool sending, SSL3Hashes *tbsHash) { SECStatus rv = SECSuccess; PK11Context *ctx; const unsigned char context_padding[] = { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, }; const char *client_cert_verify_string = "TLS 1.3, client CertificateVerify"; const char *server_cert_verify_string = "TLS 1.3, server CertificateVerify"; const char *context_string = (sending ^ ss->sec.isServer) ? client_cert_verify_string : server_cert_verify_string; unsigned int hashlength; /* Double check that we are doing the same hash.*/ PORT_Assert(hashes->len == tls13_GetHashSize(ss)); ctx = PK11_CreateDigestContext(ssl3_HashTypeToOID(algorithm)); if (!ctx) { PORT_SetError(SEC_ERROR_NO_MEMORY); goto loser; } PORT_Assert(SECFailure); PORT_Assert(!SECSuccess); PRINT_BUF(50, (ss, "TLS 1.3 hash without context", hashes->u.raw, hashes->len)); PRINT_BUF(50, (ss, "Context string", context_string, strlen(context_string))); rv |= PK11_DigestBegin(ctx); rv |= PK11_DigestOp(ctx, context_padding, sizeof(context_padding)); rv |= PK11_DigestOp(ctx, (unsigned char *)context_string, strlen(context_string) + 1); /* +1 includes the terminating 0 */ rv |= PK11_DigestOp(ctx, hashes->u.raw, hashes->len); /* Update the hash in-place */ rv |= PK11_DigestFinal(ctx, tbsHash->u.raw, &hashlength, sizeof(tbsHash->u.raw)); PK11_DestroyContext(ctx, PR_TRUE); PRINT_BUF(50, (ss, "TLS 1.3 hash with context", tbsHash->u.raw, hashlength)); tbsHash->len = hashlength; tbsHash->hashAlg = algorithm; if (rv) { ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE); goto loser; } return SECSuccess; loser: return SECFailure; } /* * Derive-Secret(Secret, Label, Messages) = * HKDF-Expand-Label(Secret, Label, * Hash(Messages) + Hash(resumption_context), L)) */ static SECStatus tls13_DeriveSecret(sslSocket *ss, PK11SymKey *key, const char *prefix, const char *suffix, const SSL3Hashes *hashes, PK11SymKey **dest) { SECStatus rv; SSL3Hashes hashesTmp; char buf[100]; const char *label; if (prefix) { if ((strlen(prefix) + strlen(suffix) + 2) > sizeof(buf)) { PORT_Assert(0); PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } (void)PR_snprintf(buf, sizeof(buf), "%s %s", prefix, suffix); label = buf; } else { label = suffix; } SSL_TRC(3, ("%d: TLS13[%d]: deriving secret '%s'", SSL_GETPID(), ss->fd, label)); if (!hashes) { rv = tls13_ComputeHandshakeHashes(ss, &hashesTmp); if (rv != SECSuccess) { PORT_Assert(0); /* Should never fail */ ssl_MapLowLevelError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } hashes = &hashesTmp; } rv = tls13_HkdfExpandLabel(key, tls13_GetHash(ss), hashes->u.raw, hashes->len, label, strlen(label), tls13_GetHkdfMechanism(ss), tls13_GetHashSize(ss), dest); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } return SECSuccess; } /* Derive traffic keys for the next cipher spec in the queue. */ static SECStatus tls13_DeriveTrafficKeys(sslSocket *ss, ssl3CipherSpec *spec, TrafficKeyType type, CipherSpecDirection direction, PRBool deleteSecret) { size_t keySize = spec->cipher_def->key_size; size_t ivSize = spec->cipher_def->iv_size + spec->cipher_def->explicit_nonce_size; /* This isn't always going to * work, but it does for * AES-GCM */ CK_MECHANISM_TYPE bulkAlgorithm = ssl3_Alg2Mech(spec->cipher_def->calg); PK11SymKey **prkp = NULL; PK11SymKey *prk = NULL; PRBool clientKey; ssl3KeyMaterial *target; const char *phase; SECStatus rv; /* These labels are just used for debugging. */ static const char kHkdfPhaseEarlyApplicationDataKeys[] = "early application data"; static const char kHkdfPhaseHandshakeKeys[] = "handshake data"; static const char kHkdfPhaseApplicationDataKeys[] = "application data"; if (ss->sec.isServer ^ (direction == CipherSpecWrite)) { clientKey = PR_TRUE; target = &spec->client; } else { clientKey = PR_FALSE; target = &spec->server; } PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); switch (type) { case TrafficKeyEarlyApplicationData: PORT_Assert(clientKey); phase = kHkdfPhaseEarlyApplicationDataKeys; prkp = &ss->ssl3.hs.clientEarlyTrafficSecret; break; case TrafficKeyHandshake: phase = kHkdfPhaseHandshakeKeys; prkp = clientKey ? &ss->ssl3.hs.clientHsTrafficSecret : &ss->ssl3.hs.serverHsTrafficSecret; break; case TrafficKeyApplicationData: phase = kHkdfPhaseApplicationDataKeys; prkp = clientKey ? &ss->ssl3.hs.clientTrafficSecret : &ss->ssl3.hs.serverTrafficSecret; break; default: LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); PORT_Assert(0); return SECFailure; } PORT_Assert(prkp != NULL); prk = *prkp; SSL_TRC(3, ("%d: TLS13[%d]: deriving %s traffic keys phase='%s'", SSL_GETPID(), ss->fd, (direction == CipherSpecWrite) ? "write" : "read", phase)); PORT_Assert(phase); spec->phase = phase; rv = tls13_HkdfExpandLabel(prk, tls13_GetHash(ss), NULL, 0, kHkdfPurposeKey, strlen(kHkdfPurposeKey), bulkAlgorithm, keySize, &target->write_key); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); PORT_Assert(0); goto loser; } rv = tls13_HkdfExpandLabelRaw(prk, tls13_GetHash(ss), NULL, 0, kHkdfPurposeIv, strlen(kHkdfPurposeIv), target->write_iv, ivSize); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); PORT_Assert(0); goto loser; } if (deleteSecret) { PK11_FreeSymKey(prk); *prkp = NULL; } return SECSuccess; loser: return SECFailure; } static SECStatus tls13_SetupPendingCipherSpec(sslSocket *ss) { ssl3CipherSpec *pSpec; ssl3CipherSuite suite = ss->ssl3.hs.cipher_suite; const ssl3BulkCipherDef *bulk = ssl_GetBulkCipherDef( ssl_LookupCipherSuiteDef(suite)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); ssl_GetSpecWriteLock(ss); /*******************************/ pSpec = ss->ssl3.pwSpec; /* Version isn't set when we send 0-RTT data. */ pSpec->version = PR_MAX(SSL_LIBRARY_VERSION_TLS_1_3, ss->version); SSL_TRC(3, ("%d: TLS13[%d]: Set Pending Cipher Suite to 0x%04x", SSL_GETPID(), ss->fd, suite)); pSpec->cipher_def = bulk; ssl_ReleaseSpecWriteLock(ss); /*******************************/ return SECSuccess; } /* Install a new cipher spec for this direction. */ static SECStatus tls13_SetCipherSpec(sslSocket *ss, TrafficKeyType type, CipherSpecDirection direction, PRBool deleteSecret) { SECStatus rv; ssl3CipherSpec *spec = NULL; ssl3CipherSpec **specp = (direction == CipherSpecRead) ? &ss->ssl3.crSpec : &ss->ssl3.cwSpec; /* Flush out old handshake data. */ ssl_GetXmitBufLock(ss); rv = ssl3_FlushHandshake(ss, ssl_SEND_FLAG_FORCE_INTO_BUFFER); ssl_ReleaseXmitBufLock(ss); if (rv != SECSuccess) { return SECFailure; } /* Create the new spec. */ spec = PORT_ZNew(ssl3CipherSpec); if (!spec) { PORT_SetError(SEC_ERROR_NO_MEMORY); return SECFailure; } spec->refCt = 1; PR_APPEND_LINK(&spec->link, &ss->ssl3.hs.cipherSpecs); ss->ssl3.pwSpec = ss->ssl3.prSpec = spec; rv = tls13_SetupPendingCipherSpec(ss); if (rv != SECSuccess) return SECFailure; switch (spec->cipher_def->calg) { case calg_aes_gcm: spec->aead = tls13_AESGCM; break; case calg_chacha20: spec->aead = tls13_ChaCha20Poly1305; break; default: PORT_Assert(0); return SECFailure; break; } rv = tls13_DeriveTrafficKeys(ss, spec, type, direction, deleteSecret); if (rv != SECSuccess) { return SECFailure; } /* We use the epoch for cipher suite identification, so increment * it in both TLS and DTLS. */ if ((*specp)->epoch == PR_UINT16_MAX) { return SECFailure; } spec->epoch = (PRUint16)type; if (!IS_DTLS(ss)) { spec->read_seq_num = spec->write_seq_num = 0; } else { /* The sequence number has the high 16 bits as the epoch. */ spec->read_seq_num = spec->write_seq_num = (sslSequenceNumber)spec->epoch << 48; dtls_InitRecvdRecords(&spec->recvdRecords); } if (type == TrafficKeyEarlyApplicationData) { spec->earlyDataRemaining = ss->sec.ci.sid->u.ssl3.locked.sessionTicket.max_early_data_size; } /* Now that we've set almost everything up, finally cut over. */ ssl_GetSpecWriteLock(ss); tls13_CipherSpecRelease(*specp); /* May delete old cipher. */ *specp = spec; /* Overwrite. */ ssl_ReleaseSpecWriteLock(ss); SSL_TRC(3, ("%d: TLS13[%d]: %s installed key for phase='%s'.%d dir=%s", SSL_GETPID(), ss->fd, SSL_ROLE(ss), spec->phase, spec->epoch, direction == CipherSpecRead ? "read" : "write")); if (ss->ssl3.changedCipherSpecFunc) { ss->ssl3.changedCipherSpecFunc(ss->ssl3.changedCipherSpecArg, direction == CipherSpecWrite, spec); } return SECSuccess; } static SECStatus tls13_ComputeHandshakeHashes(sslSocket *ss, SSL3Hashes *hashes) { SECStatus rv; PK11Context *ctx = NULL; PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); if (ss->ssl3.hs.hashType == handshake_hash_unknown) { /* Backup: if we haven't done any hashing, then hash now. * This happens when we are doing 0-RTT on the client. */ ctx = PK11_CreateDigestContext(ssl3_HashTypeToOID(tls13_GetHash(ss))); if (!ctx) { ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE); return SECFailure; } if (PK11_DigestBegin(ctx) != SECSuccess) { ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE); goto loser; } PRINT_BUF(10, (NULL, "Handshake hash computed over saved messages", ss->ssl3.hs.messages.buf, ss->ssl3.hs.messages.len)); if (PK11_DigestOp(ctx, ss->ssl3.hs.messages.buf, ss->ssl3.hs.messages.len) != SECSuccess) { ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE); goto loser; } } else { ctx = PK11_CloneContext(ss->ssl3.hs.sha); if (!ctx) { ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE); return SECFailure; } } rv = PK11_DigestFinal(ctx, hashes->u.raw, &hashes->len, sizeof(hashes->u.raw)); if (rv != SECSuccess) { ssl_MapLowLevelError(SSL_ERROR_DIGEST_FAILURE); goto loser; } PORT_Assert(hashes->len == tls13_GetHashSize(ss)); PK11_DestroyContext(ctx, PR_TRUE); return SECSuccess; loser: PK11_DestroyContext(ctx, PR_TRUE); return SECFailure; } void tls13_DestroyKeyShareEntry(TLS13KeyShareEntry *offer) { SECITEM_ZfreeItem(&offer->key_exchange, PR_FALSE); PORT_ZFree(offer, sizeof(*offer)); } void tls13_DestroyKeyShares(PRCList *list) { PRCList *cur_p; /* The list must be initialized. */ PORT_Assert(PR_LIST_HEAD(list)); while (!PR_CLIST_IS_EMPTY(list)) { cur_p = PR_LIST_TAIL(list); PR_REMOVE_LINK(cur_p); tls13_DestroyKeyShareEntry((TLS13KeyShareEntry *)cur_p); } } void tls13_DestroyEarlyData(PRCList *list) { PRCList *cur_p; while (!PR_CLIST_IS_EMPTY(list)) { TLS13EarlyData *msg; cur_p = PR_LIST_TAIL(list); msg = (TLS13EarlyData *)cur_p; PR_REMOVE_LINK(cur_p); SECITEM_ZfreeItem(&msg->data, PR_FALSE); PORT_ZFree(msg, sizeof(*msg)); } } void tls13_DestroyCipherSpecs(PRCList *list) { PRCList *cur_p; while (!PR_CLIST_IS_EMPTY(list)) { cur_p = PR_LIST_TAIL(list); PR_REMOVE_LINK(cur_p); ssl3_DestroyCipherSpec((ssl3CipherSpec *)cur_p, PR_FALSE); PORT_Free(cur_p); } } /* draft-ietf-tls-tls13 Section 5.2.2 specifies the following * nonce algorithm: * * The length of the per-record nonce (iv_length) is set to max(8 bytes, * N_MIN) for the AEAD algorithm (see [RFC5116] Section 4). An AEAD * algorithm where N_MAX is less than 8 bytes MUST NOT be used with TLS. * The per-record nonce for the AEAD construction is formed as follows: * * 1. The 64-bit record sequence number is padded to the left with * zeroes to iv_length. * * 2. The padded sequence number is XORed with the static * client_write_iv or server_write_iv, depending on the role. * * The resulting quantity (of length iv_length) is used as the per- * record nonce. * * Existing suites have the same nonce size: N_MIN = N_MAX = 12 bytes * * See RFC 5288 and https://tools.ietf.org/html/draft-ietf-tls-chacha20-poly1305-04#section-2 */ static void tls13_WriteNonce(ssl3KeyMaterial *keys, const unsigned char *seqNumBuf, unsigned int seqNumLen, unsigned char *nonce, unsigned int nonceLen) { size_t i; PORT_Assert(nonceLen == 12); memcpy(nonce, keys->write_iv, 12); /* XOR the last 8 bytes of the IV with the sequence number. */ PORT_Assert(seqNumLen == 8); for (i = 0; i < 8; ++i) { nonce[4 + i] ^= seqNumBuf[i]; } PRINT_BUF(50, (NULL, "Nonce", nonce, nonceLen)); } /* Implement the SSLAEADCipher interface defined in sslimpl.h. * * That interface takes the additional data (see below) and reinterprets that as * a sequence number. In TLS 1.3 there is no additional data so this value is * just the encoded sequence number. */ static SECStatus tls13_AEAD(ssl3KeyMaterial *keys, PRBool doDecrypt, unsigned char *out, int *outlen, int maxout, const unsigned char *in, int inlen, CK_MECHANISM_TYPE mechanism, unsigned char *aeadParams, unsigned int aeadParamLength) { SECStatus rv; unsigned int uOutLen = 0; SECItem param = { siBuffer, aeadParams, aeadParamLength }; if (doDecrypt) { rv = PK11_Decrypt(keys->write_key, mechanism, ¶m, out, &uOutLen, maxout, in, inlen); } else { rv = PK11_Encrypt(keys->write_key, mechanism, ¶m, out, &uOutLen, maxout, in, inlen); } *outlen = (int)uOutLen; return rv; } static SECStatus tls13_AESGCM(ssl3KeyMaterial *keys, PRBool doDecrypt, unsigned char *out, int *outlen, int maxout, const unsigned char *in, int inlen, const unsigned char *additionalData, int additionalDataLen) { CK_GCM_PARAMS gcmParams; unsigned char nonce[12]; memset(&gcmParams, 0, sizeof(gcmParams)); gcmParams.pIv = nonce; gcmParams.ulIvLen = sizeof(nonce); gcmParams.pAAD = NULL; gcmParams.ulAADLen = 0; gcmParams.ulTagBits = 128; /* GCM measures tag length in bits. */ tls13_WriteNonce(keys, additionalData, additionalDataLen, nonce, sizeof(nonce)); return tls13_AEAD(keys, doDecrypt, out, outlen, maxout, in, inlen, CKM_AES_GCM, (unsigned char *)&gcmParams, sizeof(gcmParams)); } static SECStatus tls13_ChaCha20Poly1305(ssl3KeyMaterial *keys, PRBool doDecrypt, unsigned char *out, int *outlen, int maxout, const unsigned char *in, int inlen, const unsigned char *additionalData, int additionalDataLen) { CK_NSS_AEAD_PARAMS aeadParams; unsigned char nonce[12]; memset(&aeadParams, 0, sizeof(aeadParams)); aeadParams.pNonce = nonce; aeadParams.ulNonceLen = sizeof(nonce); aeadParams.pAAD = NULL; /* No AAD in TLS 1.3. */ aeadParams.ulAADLen = 0; aeadParams.ulTagLen = 16; /* The Poly1305 tag is 16 octets. */ tls13_WriteNonce(keys, additionalData, additionalDataLen, nonce, sizeof(nonce)); return tls13_AEAD(keys, doDecrypt, out, outlen, maxout, in, inlen, CKM_NSS_CHACHA20_POLY1305, (unsigned char *)&aeadParams, sizeof(aeadParams)); } static SECStatus tls13_HandleEncryptedExtensions(sslSocket *ss, PRUint8 *b, PRUint32 length) { SECStatus rv; PRUint32 innerLength; SECItem oldNpn = { siBuffer, NULL, 0 }; PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); SSL_TRC(3, ("%d: TLS13[%d]: handle encrypted extensions", SSL_GETPID(), ss->fd)); rv = TLS13_CHECK_HS_STATE(ss, SSL_ERROR_RX_UNEXPECTED_ENCRYPTED_EXTENSIONS, wait_encrypted_extensions); if (rv != SECSuccess) { return SECFailure; } rv = ssl3_ConsumeHandshakeNumber(ss, &innerLength, 2, &b, &length); if (rv != SECSuccess) { return SECFailure; /* Alert already sent. */ } if (innerLength != length) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_ENCRYPTED_EXTENSIONS, illegal_parameter); return SECFailure; } /* If we are doing 0-RTT, then we already have an NPN value. Stash * it for comparison. */ if (ss->ssl3.hs.zeroRttState == ssl_0rtt_sent && ss->xtnData.nextProtoState == SSL_NEXT_PROTO_EARLY_VALUE) { oldNpn = ss->xtnData.nextProto; ss->xtnData.nextProto.data = NULL; ss->xtnData.nextProtoState = SSL_NEXT_PROTO_NO_SUPPORT; } rv = ssl3_HandleExtensions(ss, &b, &length, encrypted_extensions); if (rv != SECSuccess) { return SECFailure; /* Error code set below */ } /* We can only get here if we offered 0-RTT. */ if (ssl3_ExtensionNegotiated(ss, ssl_tls13_early_data_xtn)) { PORT_Assert(ss->ssl3.hs.zeroRttState == ssl_0rtt_sent); if (!ss->statelessResume) { /* Illegal to accept 0-RTT without also accepting PSK. */ FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_ENCRYPTED_EXTENSIONS, illegal_parameter); } ss->ssl3.hs.zeroRttState = ssl_0rtt_accepted; /* Check that the server negotiated the same ALPN (if any). */ if (SECITEM_CompareItem(&oldNpn, &ss->xtnData.nextProto)) { SECITEM_FreeItem(&oldNpn, PR_FALSE); FATAL_ERROR(ss, SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID, illegal_parameter); return SECFailure; } /* Check that the server negotiated the same cipher suite. */ if (ss->ssl3.hs.cipher_suite != ss->ssl3.hs.zeroRttSuite) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_ENCRYPTED_EXTENSIONS, illegal_parameter); return SECFailure; } } else if (ss->ssl3.hs.zeroRttState == ssl_0rtt_sent) { /* Though we sent 0-RTT, the early_data extension wasn't present so the * state is unmodified; the server must have rejected 0-RTT. */ ss->ssl3.hs.zeroRttState = ssl_0rtt_ignored; ss->ssl3.hs.zeroRttIgnore = ssl_0rtt_ignore_trial; } else { PORT_Assert(ss->ssl3.hs.zeroRttState == ssl_0rtt_none || (ss->ssl3.hs.helloRetry && ss->ssl3.hs.zeroRttState == ssl_0rtt_ignored)); } SECITEM_FreeItem(&oldNpn, PR_FALSE); if (ss->ssl3.hs.kea_def->authKeyType == ssl_auth_psk) { TLS13_SET_HS_STATE(ss, wait_finished); } else { TLS13_SET_HS_STATE(ss, wait_cert_request); } return SECSuccess; } static SECStatus tls13_SendEncryptedExtensions(sslSocket *ss) { SECStatus rv; PRInt32 extensions_len = 0; PRInt32 sent_len = 0; PRUint32 maxBytes = 65535; SSL_TRC(3, ("%d: TLS13[%d]: send encrypted extensions handshake", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss)); extensions_len = ssl3_CallHelloExtensionSenders( ss, PR_FALSE, maxBytes, &ss->xtnData.encryptedExtensionsSenders[0]); rv = ssl3_AppendHandshakeHeader(ss, encrypted_extensions, extensions_len + 2); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } rv = ssl3_AppendHandshakeNumber(ss, extensions_len, 2); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } sent_len = ssl3_CallHelloExtensionSenders( ss, PR_TRUE, extensions_len, &ss->xtnData.encryptedExtensionsSenders[0]); PORT_Assert(sent_len == extensions_len); if (sent_len != extensions_len) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); PORT_Assert(sent_len == 0); return SECFailure; } return SECSuccess; } SECStatus tls13_SendCertificateVerify(sslSocket *ss, SECKEYPrivateKey *privKey) { SECStatus rv = SECFailure; SECItem buf = { siBuffer, NULL, 0 }; unsigned int len; SSLHashType hashAlg; SSL3Hashes hash; SSL3Hashes tbsHash; /* The hash "to be signed". */ PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); SSL_TRC(3, ("%d: TLS13[%d]: send certificate_verify handshake", SSL_GETPID(), ss->fd)); PORT_Assert(ss->ssl3.hs.hashType == handshake_hash_single); rv = tls13_ComputeHandshakeHashes(ss, &hash); if (rv != SECSuccess) { return SECFailure; } /* We should have picked a signature scheme when we received a * CertificateRequest, or when we picked a server certificate. */ PORT_Assert(ss->ssl3.hs.signatureScheme != ssl_sig_none); if (ss->ssl3.hs.signatureScheme == ssl_sig_none) { PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } hashAlg = ssl_SignatureSchemeToHashType(ss->ssl3.hs.signatureScheme); rv = tls13_AddContextToHashes(ss, &hash, hashAlg, PR_TRUE, &tbsHash); if (rv != SECSuccess) { return SECFailure; } rv = ssl3_SignHashes(ss, &tbsHash, privKey, &buf); if (rv == SECSuccess && !ss->sec.isServer) { /* Remember the info about the slot that did the signing. * Later, when doing an SSL restart handshake, verify this. * These calls are mere accessors, and can't fail. */ PK11SlotInfo *slot; sslSessionID *sid = ss->sec.ci.sid; slot = PK11_GetSlotFromPrivateKey(privKey); sid->u.ssl3.clAuthSeries = PK11_GetSlotSeries(slot); sid->u.ssl3.clAuthSlotID = PK11_GetSlotID(slot); sid->u.ssl3.clAuthModuleID = PK11_GetModuleID(slot); sid->u.ssl3.clAuthValid = PR_TRUE; PK11_FreeSlot(slot); } if (rv != SECSuccess) { goto done; /* err code was set by ssl3_SignHashes */ } len = buf.len + 2 + 2; rv = ssl3_AppendHandshakeHeader(ss, certificate_verify, len); if (rv != SECSuccess) { goto done; /* error code set by AppendHandshake */ } rv = ssl3_AppendHandshakeNumber(ss, ss->ssl3.hs.signatureScheme, 2); if (rv != SECSuccess) { goto done; /* err set by AppendHandshakeNumber */ } rv = ssl3_AppendHandshakeVariable(ss, buf.data, buf.len, 2); if (rv != SECSuccess) { goto done; /* error code set by AppendHandshake */ } done: /* For parity with the allocation functions, which don't use * SECITEM_AllocItem(). */ if (buf.data) PORT_Free(buf.data); return rv; } /* Called from tls13_CompleteHandleHandshakeMessage() when it has deciphered a complete * tls13 CertificateVerify message * Caller must hold Handshake and RecvBuf locks. */ SECStatus tls13_HandleCertificateVerify(sslSocket *ss, PRUint8 *b, PRUint32 length, SSL3Hashes *hashes) { SECItem signed_hash = { siBuffer, NULL, 0 }; SECStatus rv; SSLSignatureScheme sigScheme; SSLHashType hashAlg; SSL3Hashes tbsHash; SSL_TRC(3, ("%d: TLS13[%d]: handle certificate_verify handshake", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); rv = TLS13_CHECK_HS_STATE(ss, SSL_ERROR_RX_UNEXPECTED_CERT_VERIFY, wait_cert_verify); if (rv != SECSuccess) { return SECFailure; } PORT_Assert(hashes); rv = ssl_ConsumeSignatureScheme(ss, &b, &length, &sigScheme); if (rv != SECSuccess) { PORT_SetError(SSL_ERROR_RX_MALFORMED_CERT_VERIFY); return SECFailure; } rv = ssl_CheckSignatureSchemeConsistency(ss, sigScheme, ss->sec.peerCert); if (rv != SECSuccess) { /* Error set already */ return SECFailure; } hashAlg = ssl_SignatureSchemeToHashType(sigScheme); rv = tls13_AddContextToHashes(ss, hashes, hashAlg, PR_FALSE, &tbsHash); if (rv != SECSuccess) { FATAL_ERROR(ss, SSL_ERROR_DIGEST_FAILURE, internal_error); return SECFailure; } rv = ssl3_ConsumeHandshakeVariable(ss, &signed_hash, 2, &b, &length); if (rv != SECSuccess) { PORT_SetError(SSL_ERROR_RX_MALFORMED_CERT_VERIFY); return SECFailure; } if (length != 0) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CERT_VERIFY, decode_error); return SECFailure; } rv = ssl3_VerifySignedHashes(ss, sigScheme, &tbsHash, &signed_hash); if (rv != SECSuccess) { FATAL_ERROR(ss, PORT_GetError(), decrypt_error); return SECFailure; } /* Set the auth type. */ if (!ss->sec.isServer) { ss->sec.authType = ssl_SignatureSchemeToAuthType(sigScheme); } /* Request a client certificate now if one was requested. */ if (ss->ssl3.hs.certificateRequest) { TLS13CertificateRequest *req = ss->ssl3.hs.certificateRequest; PORT_Assert(!ss->sec.isServer); rv = ssl3_CompleteHandleCertificateRequest(ss, req->signatureSchemes, req->signatureSchemeCount, &req->ca_list); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return rv; } } TLS13_SET_HS_STATE(ss, wait_finished); return SECSuccess; } static SECStatus tls13_ComputePskBinderHash(sslSocket *ss, unsigned long prefixLength, SSL3Hashes *hashes) { SECStatus rv; PORT_Assert(ss->ssl3.hs.hashType == handshake_hash_unknown); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); PORT_Assert(prefixLength <= ss->ssl3.hs.messages.len); PRINT_BUF(10, (NULL, "Handshake hash computed over ClientHello prefix", ss->ssl3.hs.messages.buf, prefixLength)); rv = PK11_HashBuf(ssl3_HashTypeToOID(tls13_GetHash(ss)), hashes->u.raw, ss->ssl3.hs.messages.buf, prefixLength); if (rv != SECSuccess) { ssl_MapLowLevelError(SSL_ERROR_SHA_DIGEST_FAILURE); goto loser; } hashes->len = tls13_GetHashSize(ss); PRINT_BUF(10, (NULL, "PSK Binder hash", hashes->u.raw, hashes->len)); return SECSuccess; loser: return SECFailure; } /* Compute the PSK Binder This is kind of sneaky.*/ SECStatus tls13_ComputePskBinder(sslSocket *ss, PRBool sending, unsigned int prefixLength, PRUint8 *output, unsigned int *outputLen, unsigned int maxOutputLen) { SSL3Hashes hashes; SECStatus rv; rv = tls13_ComputePskBinderHash(ss, prefixLength, &hashes); if (rv != SECSuccess) return SECFailure; return tls13_ComputeFinished(ss, ss->ssl3.hs.pskBinderKey, &hashes, sending, output, outputLen, maxOutputLen); } static SECStatus tls13_ComputeFinished(sslSocket *ss, PK11SymKey *baseKey, const SSL3Hashes *hashes, PRBool sending, PRUint8 *output, unsigned int *outputLen, unsigned int maxOutputLen) { SECStatus rv; PK11Context *hmacCtx = NULL; CK_MECHANISM_TYPE macAlg = tls13_GetHmacMechanism(ss); SECItem param = { siBuffer, NULL, 0 }; unsigned int outputLenUint; const char *label = kHkdfLabelFinishedSecret; PK11SymKey *secret = NULL; PORT_Assert(baseKey); SSL_TRC(3, ("%d: TLS13[%d]: %s calculate finished", SSL_GETPID(), ss->fd, SSL_ROLE(ss))); PRINT_BUF(50, (ss, "Handshake hash", hashes->u.raw, hashes->len)); /* Now derive the appropriate finished secret from the base secret. */ rv = tls13_HkdfExpandLabel(baseKey, tls13_GetHash(ss), NULL, 0, label, strlen(label), tls13_GetHmacMechanism(ss), tls13_GetHashSize(ss), &secret); if (rv != SECSuccess) { goto abort; } PORT_Assert(hashes->len == tls13_GetHashSize(ss)); hmacCtx = PK11_CreateContextBySymKey(macAlg, CKA_SIGN, secret, ¶m); if (!hmacCtx) { goto abort; } rv = PK11_DigestBegin(hmacCtx); if (rv != SECSuccess) goto abort; rv = PK11_DigestOp(hmacCtx, hashes->u.raw, hashes->len); if (rv != SECSuccess) goto abort; PORT_Assert(maxOutputLen >= tls13_GetHashSize(ss)); rv = PK11_DigestFinal(hmacCtx, output, &outputLenUint, maxOutputLen); if (rv != SECSuccess) goto abort; *outputLen = outputLenUint; PK11_FreeSymKey(secret); PK11_DestroyContext(hmacCtx, PR_TRUE); return SECSuccess; abort: if (secret) { PK11_FreeSymKey(secret); } if (hmacCtx) { PK11_DestroyContext(hmacCtx, PR_TRUE); } PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } static SECStatus tls13_SendFinished(sslSocket *ss, PK11SymKey *baseKey) { SECStatus rv; PRUint8 finishedBuf[TLS13_MAX_FINISHED_SIZE]; unsigned int finishedLen; SSL3Hashes hashes; SSL_TRC(3, ("%d: TLS13[%d]: send finished handshake", SSL_GETPID(), ss->fd)); PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); rv = tls13_ComputeHandshakeHashes(ss, &hashes); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } ssl_GetSpecReadLock(ss); rv = tls13_ComputeFinished(ss, baseKey, &hashes, PR_TRUE, finishedBuf, &finishedLen, sizeof(finishedBuf)); ssl_ReleaseSpecReadLock(ss); if (rv != SECSuccess) { LOG_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } rv = ssl3_AppendHandshakeHeader(ss, finished, finishedLen); if (rv != SECSuccess) { return SECFailure; /* Error code already set. */ } rv = ssl3_AppendHandshake(ss, finishedBuf, finishedLen); if (rv != SECSuccess) { return SECFailure; /* Error code already set. */ } /* TODO(ekr@rtfm.com): Record key log */ return SECSuccess; } static SECStatus tls13_VerifyFinished(sslSocket *ss, SSL3HandshakeType message, PK11SymKey *secret, PRUint8 *b, PRUint32 length, const SSL3Hashes *hashes) { SECStatus rv; PRUint8 finishedBuf[TLS13_MAX_FINISHED_SIZE]; unsigned int finishedLen; if (!hashes) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } rv = tls13_ComputeFinished(ss, secret, hashes, PR_FALSE, finishedBuf, &finishedLen, sizeof(finishedBuf)); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } if (length != finishedLen) { #ifndef UNSAFE_FUZZER_MODE FATAL_ERROR(ss, message == finished ? SSL_ERROR_RX_MALFORMED_FINISHED : SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter); return SECFailure; #endif } if (NSS_SecureMemcmp(b, finishedBuf, finishedLen) != 0) { #ifndef UNSAFE_FUZZER_MODE FATAL_ERROR(ss, SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE, decrypt_error); return SECFailure; #endif } return SECSuccess; } static SECStatus tls13_ClientHandleFinished(sslSocket *ss, PRUint8 *b, PRUint32 length, const SSL3Hashes *hashes) { SECStatus rv; PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); SSL_TRC(3, ("%d: TLS13[%d]: client handle finished handshake", SSL_GETPID(), ss->fd)); rv = TLS13_CHECK_HS_STATE(ss, SSL_ERROR_RX_UNEXPECTED_FINISHED, wait_finished); if (rv != SECSuccess) { return SECFailure; } rv = tls13_VerifyFinished(ss, finished, ss->ssl3.hs.serverHsTrafficSecret, b, length, hashes); if (rv != SECSuccess) return SECFailure; return tls13_SendClientSecondRound(ss); } static SECStatus tls13_ServerHandleFinished(sslSocket *ss, PRUint8 *b, PRUint32 length, const SSL3Hashes *hashes) { SECStatus rv; PK11SymKey *secret; PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); SSL_TRC(3, ("%d: TLS13[%d]: server handle finished handshake", SSL_GETPID(), ss->fd)); rv = TLS13_CHECK_HS_STATE(ss, SSL_ERROR_RX_UNEXPECTED_FINISHED, wait_finished); if (rv != SECSuccess) { return SECFailure; } if (TLS13_IN_HS_STATE(ss, wait_finished)) { secret = ss->ssl3.hs.clientHsTrafficSecret; } else { secret = ss->ssl3.hs.clientEarlyTrafficSecret; } rv = tls13_VerifyFinished(ss, finished, secret, b, length, hashes); if (rv != SECSuccess) return SECFailure; rv = tls13_SetCipherSpec(ss, TrafficKeyApplicationData, CipherSpecRead, PR_TRUE); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } rv = tls13_FinishHandshake(ss); if (rv != SECSuccess) { return SECFailure; /* Error code and alerts handled below */ } ssl_GetXmitBufLock(ss); if (ss->opt.enableSessionTickets) { rv = tls13_SendNewSessionTicket(ss); if (rv != SECSuccess) { ssl_ReleaseXmitBufLock(ss); return SECFailure; /* Error code and alerts handled below */ } rv = ssl3_FlushHandshake(ss, 0); } ssl_ReleaseXmitBufLock(ss); if (rv != SECSuccess) return SECFailure; return SECSuccess; } static SECStatus tls13_FinishHandshake(sslSocket *ss) { SECStatus rv; PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); PORT_Assert(ss->ssl3.hs.restartTarget == NULL); rv = tls13_ComputeFinalSecrets(ss); if (rv != SECSuccess) return SECFailure; /* The first handshake is now completed. */ ss->handshake = NULL; /* Don't need this. */ PK11_FreeSymKey(ss->ssl3.hs.clientHsTrafficSecret); ss->ssl3.hs.clientHsTrafficSecret = NULL; PK11_FreeSymKey(ss->ssl3.hs.serverHsTrafficSecret); ss->ssl3.hs.serverHsTrafficSecret = NULL; TLS13_SET_HS_STATE(ss, idle_handshake); ssl_FinishHandshake(ss); return SECSuccess; } /* Do the parts of sending the client's second round that require * the XmitBuf lock. */ static SECStatus tls13_SendClientSecondFlight(sslSocket *ss, PRBool sendClientCert, SSL3AlertDescription *sendAlert) { SECStatus rv; PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss)); *sendAlert = internal_error; if (ss->ssl3.sendEmptyCert) { ss->ssl3.sendEmptyCert = PR_FALSE; rv = ssl3_SendEmptyCertificate(ss); /* Don't send verify */ if (rv != SECSuccess) { return SECFailure; /* error code is set. */ } } else if (sendClientCert) { rv = tls13_SendCertificate(ss); if (rv != SECSuccess) { return SECFailure; /* error code is set. */ } } if (ss->ssl3.hs.certificateRequest) { PORT_FreeArena(ss->ssl3.hs.certificateRequest->arena, PR_FALSE); ss->ssl3.hs.certificateRequest = NULL; } if (sendClientCert) { rv = tls13_SendCertificateVerify(ss, ss->ssl3.clientPrivateKey); SECKEY_DestroyPrivateKey(ss->ssl3.clientPrivateKey); ss->ssl3.clientPrivateKey = NULL; if (rv != SECSuccess) { return SECFailure; /* err is set. */ } } rv = tls13_SendFinished(ss, ss->ssl3.hs.clientHsTrafficSecret); if (rv != SECSuccess) { return SECFailure; /* err code was set. */ } rv = ssl3_FlushHandshake(ss, IS_DTLS(ss) ? ssl_SEND_FLAG_NO_RETRANSMIT : 0); if (rv != SECSuccess) { /* No point in sending an alert here because we're not going to * be able to send it if we couldn't flush the handshake. */ *sendAlert = no_alert; return SECFailure; } rv = dtls_StartHolddownTimer(ss); if (rv != SECSuccess) { return SECFailure; /* err code was set. */ } return SECSuccess; } static SECStatus tls13_SendClientSecondRound(sslSocket *ss) { SECStatus rv; PRBool sendClientCert; SSL3AlertDescription sendAlert = no_alert; PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss)); PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss)); sendClientCert = !ss->ssl3.sendEmptyCert && ss->ssl3.clientCertChain != NULL && ss->ssl3.clientPrivateKey != NULL; /* Defer client authentication sending if we are still waiting for server * authentication. This avoids unnecessary disclosure of client credentials * to an unauthenticated server. */ if (ss->ssl3.hs.restartTarget) { PR_NOT_REACHED("unexpected ss->ssl3.hs.restartTarget"); PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } if (ss->ssl3.hs.authCertificatePending) { SSL_TRC(3, ("%d: TLS13[%d]: deferring ssl3_SendClientSecondRound because" " certificate authentication is still pending.", SSL_GETPID(), ss->fd)); ss->ssl3.hs.restartTarget = tls13_SendClientSecondRound; return SECWouldBlock; } if (ss->ssl3.hs.zeroRttState == ssl_0rtt_accepted) { rv = tls13_SendEndOfEarlyData(ss); if (rv != SECSuccess) { return SECFailure; /* Error code already set. */ } } rv = tls13_SetCipherSpec(ss, TrafficKeyHandshake, CipherSpecWrite, PR_FALSE); if (rv != SECSuccess) { FATAL_ERROR(ss, SSL_ERROR_INIT_CIPHER_SUITE_FAILURE, internal_error); return SECFailure; } rv = tls13_ComputeApplicationSecrets(ss); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } rv = tls13_SetCipherSpec(ss, TrafficKeyApplicationData, CipherSpecRead, PR_FALSE); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } ssl_GetXmitBufLock(ss); /*******************************/ rv = tls13_SendClientSecondFlight(ss, sendClientCert, &sendAlert); ssl_ReleaseXmitBufLock(ss); /*******************************/ if (rv != SECSuccess) { if (sendAlert != no_alert) { FATAL_ERROR(ss, PORT_GetError(), sendAlert); } else { LOG_ERROR(ss, PORT_GetError()); } return SECFailure; } rv = tls13_SetCipherSpec(ss, TrafficKeyApplicationData, CipherSpecWrite, PR_TRUE); if (rv != SECSuccess) { PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } /* The handshake is now finished */ return tls13_FinishHandshake(ss); } /* * enum { (65535) } TicketExtensionType; * * struct { * TicketExtensionType extension_type; * opaque extension_data<0..2^16-1>; * } TicketExtension; * * struct { * uint32 ticket_lifetime; * uint32 ticket_age_add; * opaque ticket<1..2^16-1>; * TicketExtension extensions<0..2^16-2>; * } NewSessionTicket; */ PRUint32 ssl_max_early_data_size = (2 << 16); /* Arbitrary limit. */ SECStatus tls13_SendNewSessionTicket(sslSocket *ss) { PRUint16 message_length; SECItem ticket_data = { 0, NULL, 0 }; SECStatus rv; NewSessionTicket ticket = { 0 }; PRUint32 max_early_data_size_len = 0; ticket.flags = 0; if (ss->opt.enable0RttData) { ticket.flags |= ticket_allow_early_data; max_early_data_size_len = 8; /* type + len + value. */ } ticket.ticket_lifetime_hint = ssl_ticket_lifetime; rv = ssl3_EncodeSessionTicket(ss, &ticket, &ticket_data); if (rv != SECSuccess) goto loser; message_length = 4 + /* lifetime */ 4 + /* ticket_age_add */ 2 + max_early_data_size_len + /* max_early_data_size_len */ 2 + /* ticket length */ ticket_data.len; rv = ssl3_AppendHandshakeHeader(ss, new_session_ticket, message_length); if (rv != SECSuccess) goto loser; /* This is a fixed value. */ rv = ssl3_AppendHandshakeNumber(ss, ssl_ticket_lifetime, 4); if (rv != SECSuccess) goto loser; /* The ticket age obfuscator. */ rv = PK11_GenerateRandom((PRUint8 *)&ticket.ticket_age_add, sizeof(ticket.ticket_age_add)); if (rv != SECSuccess) goto loser; rv = ssl3_AppendHandshakeNumber(ss, ticket.ticket_age_add, 4); if (rv != SECSuccess) goto loser; /* Encode the ticket. */ rv = ssl3_AppendHandshakeVariable( ss, ticket_data.data, ticket_data.len, 2); if (rv != SECSuccess) goto loser; /* Extensions. */ rv = ssl3_AppendHandshakeNumber(ss, max_early_data_size_len, 2); if (rv != SECSuccess) goto loser; if (max_early_data_size_len) { rv = ssl3_AppendHandshakeNumber( ss, ssl_tls13_ticket_early_data_info_xtn, 2); if (rv != SECSuccess) goto loser; /* Length */ rv = ssl3_AppendHandshakeNumber(ss, 4, 2); if (rv != SECSuccess) goto loser; rv = ssl3_AppendHandshakeNumber(ss, ssl_max_early_data_size, 4); if (rv != SECSuccess) goto loser; } SECITEM_FreeItem(&ticket_data, PR_FALSE); return SECSuccess; loser: if (ticket_data.data) { SECITEM_FreeItem(&ticket_data, PR_FALSE); } return SECFailure; } static SECStatus tls13_HandleNewSessionTicket(sslSocket *ss, PRUint8 *b, PRUint32 length) { SECStatus rv; PRUint32 utmp; NewSessionTicket ticket = { 0 }; SECItem data; SECItem ticket_data; SSL_TRC(3, ("%d: TLS13[%d]: handle new session ticket message", SSL_GETPID(), ss->fd)); rv = TLS13_CHECK_HS_STATE(ss, SSL_ERROR_RX_UNEXPECTED_NEW_SESSION_TICKET, idle_handshake); if (rv != SECSuccess) { return SECFailure; } if (!ss->firstHsDone || ss->sec.isServer) { FATAL_ERROR(ss, SSL_ERROR_RX_UNEXPECTED_NEW_SESSION_TICKET, unexpected_message); return SECFailure; } ticket.received_timestamp = PR_Now(); rv = ssl3_ConsumeHandshakeNumber(ss, &ticket.ticket_lifetime_hint, 4, &b, &length); if (rv != SECSuccess) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET, decode_error); return SECFailure; } ticket.ticket.type = siBuffer; rv = ssl3_ConsumeHandshake(ss, &utmp, sizeof(utmp), &b, &length); if (rv != SECSuccess) { PORT_SetError(SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET); return SECFailure; } ticket.ticket_age_add = PR_ntohl(utmp); /* Get the ticket value. */ rv = ssl3_ConsumeHandshakeVariable(ss, &ticket_data, 2, &b, &length); if (rv != SECSuccess || !ticket_data.len) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET, decode_error); return SECFailure; } /* Parse extensions. */ rv = ssl3_ConsumeHandshakeVariable(ss, &data, 2, &b, &length); if (rv != SECSuccess) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET, decode_error); return SECFailure; } rv = ssl3_HandleExtensions(ss, &data.data, &data.len, new_session_ticket); if (rv != SECSuccess) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET, decode_error); return SECFailure; } if (ss->xtnData.max_early_data_size) { ticket.flags |= ticket_allow_early_data; ticket.max_early_data_size = ss->xtnData.max_early_data_size; } if (length != 0) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET, decode_error); return SECFailure; } if (!ss->opt.noCache) { PORT_Assert(ss->sec.ci.sid); rv = SECITEM_CopyItem(NULL, &ticket.ticket, &ticket_data); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_NO_MEMORY, internal_error); return SECFailure; } PRINT_BUF(50, (ss, "Caching session ticket", ticket.ticket.data, ticket.ticket.len)); /* Replace a previous session ticket when * we receive a second NewSessionTicket message. */ if (ss->sec.ci.sid->cached == in_client_cache) { /* Create a new session ID. */ sslSessionID *sid = ssl3_NewSessionID(ss, PR_FALSE); if (!sid) { return SECFailure; } /* Copy over the peerCert. */ PORT_Assert(ss->sec.ci.sid->peerCert); sid->peerCert = CERT_DupCertificate(ss->sec.ci.sid->peerCert); if (!sid->peerCert) { ssl_FreeSID(sid); return SECFailure; } /* Destroy the old SID. */ ss->sec.uncache(ss->sec.ci.sid); ssl_FreeSID(ss->sec.ci.sid); ss->sec.ci.sid = sid; } ssl3_SetSIDSessionTicket(ss->sec.ci.sid, &ticket); PORT_Assert(!ticket.ticket.data); rv = ssl3_FillInCachedSID(ss, ss->sec.ci.sid); if (rv != SECSuccess) return SECFailure; /* Cache the session. */ ss->sec.cache(ss->sec.ci.sid); } return SECSuccess; } typedef enum { ExtensionNotUsed, ExtensionClientOnly, ExtensionSendClear, ExtensionSendClearOrHrr, ExtensionSendHrr, ExtensionSendEncrypted, ExtensionSendCertificate, ExtensionNewSessionTicket } Tls13ExtensionStatus; static const struct { PRUint16 ex_value; Tls13ExtensionStatus status; } KnownExtensions[] = { { ssl_server_name_xtn, ExtensionSendEncrypted }, { ssl_supported_groups_xtn, ExtensionSendEncrypted }, { ssl_ec_point_formats_xtn, ExtensionNotUsed }, { ssl_signature_algorithms_xtn, ExtensionClientOnly }, { ssl_use_srtp_xtn, ExtensionSendEncrypted }, { ssl_app_layer_protocol_xtn, ExtensionSendEncrypted }, { ssl_padding_xtn, ExtensionNotUsed }, { ssl_extended_master_secret_xtn, ExtensionNotUsed }, { ssl_session_ticket_xtn, ExtensionClientOnly }, { ssl_tls13_key_share_xtn, ExtensionSendClearOrHrr }, { ssl_tls13_pre_shared_key_xtn, ExtensionSendClear }, { ssl_tls13_early_data_xtn, ExtensionSendEncrypted }, { ssl_next_proto_nego_xtn, ExtensionNotUsed }, { ssl_renegotiation_info_xtn, ExtensionNotUsed }, { ssl_signed_cert_timestamp_xtn, ExtensionSendCertificate }, { ssl_cert_status_xtn, ExtensionSendCertificate }, { ssl_tls13_ticket_early_data_info_xtn, ExtensionNewSessionTicket }, { ssl_tls13_cookie_xtn, ExtensionSendHrr }, { ssl_tls13_short_header_xtn, ExtensionSendClear } }; PRBool tls13_ExtensionAllowed(PRUint16 extension, SSL3HandshakeType message) { unsigned int i; PORT_Assert((message == client_hello) || (message == server_hello) || (message == hello_retry_request) || (message == encrypted_extensions) || (message == new_session_ticket) || (message == certificate) || (message == certificate_request)); for (i = 0; i < PR_ARRAY_SIZE(KnownExtensions); i++) { if (KnownExtensions[i].ex_value == extension) break; } if (i == PR_ARRAY_SIZE(KnownExtensions)) { /* We have never heard of this extension which is OK * in client_hello and new_session_ticket. */ return (message == client_hello) || (message == new_session_ticket); } switch (KnownExtensions[i].status) { case ExtensionNotUsed: return PR_FALSE; case ExtensionClientOnly: return message == client_hello; case ExtensionSendClear: return message == client_hello || message == server_hello; case ExtensionSendClearOrHrr: return message == client_hello || message == server_hello || message == hello_retry_request; case ExtensionSendHrr: return message == client_hello || message == hello_retry_request; case ExtensionSendEncrypted: return message == client_hello || message == encrypted_extensions; case ExtensionNewSessionTicket: return message == new_session_ticket; case ExtensionSendCertificate: return message == client_hello || message == certificate; } PORT_Assert(0); /* Not reached */ return PR_TRUE; } /* TLS 1.3 doesn't actually have additional data but the aead function * signature overloads additional data to carry the record sequence * number and that's what we put here. The TLS 1.3 AEAD functions * just use this input as the sequence number and not as additional * data. */ static void tls13_FormatAdditionalData(PRUint8 *aad, unsigned int length, sslSequenceNumber seqNum) { PRUint8 *ptr = aad; PORT_Assert(length == 8); ptr = ssl_EncodeUintX(seqNum, 8, ptr); PORT_Assert((ptr - aad) == length); } PRInt32 tls13_LimitEarlyData(sslSocket *ss, SSL3ContentType type, PRInt32 toSend) { PRInt32 reduced; PORT_Assert(type == content_application_data); PORT_Assert(ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3); PORT_Assert(!ss->firstHsDone); if (ss->ssl3.cwSpec->epoch != TrafficKeyEarlyApplicationData) { return toSend; } if (IS_DTLS(ss) && toSend > ss->ssl3.cwSpec->earlyDataRemaining) { /* Don't split application data records in DTLS. */ return 0; } reduced = PR_MIN(toSend, ss->ssl3.cwSpec->earlyDataRemaining); ss->ssl3.cwSpec->earlyDataRemaining -= reduced; return reduced; } SECStatus tls13_ProtectRecord(sslSocket *ss, ssl3CipherSpec *cwSpec, SSL3ContentType type, const PRUint8 *pIn, PRUint32 contentLen, sslBuffer *wrBuf) { const ssl3BulkCipherDef *cipher_def = cwSpec->cipher_def; const int tagLen = cipher_def->tag_size; SECStatus rv; SSL_TRC(3, ("%d: TLS13[%d]: spec=%d (%s) protect record 0x%0llx len=%u", SSL_GETPID(), ss->fd, cwSpec, cwSpec->phase, cwSpec->write_seq_num, contentLen)); if (contentLen + 1 + tagLen > wrBuf->space) { PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } /* Copy the data into the wrBuf. We're going to encrypt in-place * in the AEAD branch anyway */ PORT_Memcpy(wrBuf->buf, pIn, contentLen); if (cipher_def->calg == ssl_calg_null) { /* Shortcut for plaintext */ wrBuf->len = contentLen; } else { PRUint8 aad[8]; PORT_Assert(cipher_def->type == type_aead); /* Add the content type at the end. */ wrBuf->buf[contentLen] = type; tls13_FormatAdditionalData(aad, sizeof(aad), cwSpec->write_seq_num); rv = cwSpec->aead( ss->sec.isServer ? &cwSpec->server : &cwSpec->client, PR_FALSE, /* do encrypt */ wrBuf->buf, /* output */ (int *)&wrBuf->len, /* out len */ wrBuf->space, /* max out */ wrBuf->buf, contentLen + 1, /* input */ aad, sizeof(aad)); if (rv != SECSuccess) { PORT_SetError(SSL_ERROR_ENCRYPTION_FAILURE); return SECFailure; } } return SECSuccess; } /* Unprotect a TLS 1.3 record and leave the result in plaintext. * * Called by ssl3_HandleRecord. Caller must hold the spec read lock. * Therefore, we MUST not call SSL3_SendAlert(). * * If SECFailure is returned, we: * 1. Set |*alert| to the alert to be sent. * 2. Call PORT_SetError() witn an appropriate code. */ SECStatus tls13_UnprotectRecord(sslSocket *ss, SSL3Ciphertext *cText, sslBuffer *plaintext, SSL3AlertDescription *alert) { ssl3CipherSpec *crSpec = ss->ssl3.crSpec; const ssl3BulkCipherDef *cipher_def = crSpec->cipher_def; PRUint8 aad[8]; SECStatus rv; *alert = bad_record_mac; /* Default alert for most issues. */ SSL_TRC(3, ("%d: TLS13[%d]: spec=%d (%s) unprotect record 0x%0llx len=%u", SSL_GETPID(), ss->fd, crSpec, crSpec->phase, crSpec->read_seq_num, cText->buf->len)); /* We can perform this test in variable time because the record's total * length and the ciphersuite are both public knowledge. */ if (cText->buf->len < cipher_def->tag_size) { SSL_TRC(3, ("%d: TLS13[%d]: record too short to contain valid AEAD data", SSL_GETPID(), ss->fd)); PORT_SetError(SSL_ERROR_BAD_MAC_READ); return SECFailure; } /* Verify that the content type is right, even though we overwrite it. */ if (cText->type != content_application_data) { SSL_TRC(3, ("%d: TLS13[%d]: record has invalid exterior content type=%d", SSL_GETPID(), ss->fd, cText->type)); /* Do we need a better error here? */ PORT_SetError(SSL_ERROR_BAD_MAC_READ); return SECFailure; } /* Check the version number in the record */ if ((IS_DTLS(ss) && cText->version != kDtlsRecordVersion) || (!IS_DTLS(ss) && cText->version != kTlsRecordVersion)) { /* Do we need a better error here? */ SSL_TRC(3, ("%d: TLS13[%d]: record has bogus version", SSL_GETPID(), ss->fd)); return SECFailure; } /* Decrypt */ PORT_Assert(cipher_def->type == type_aead); tls13_FormatAdditionalData(aad, sizeof(aad), IS_DTLS(ss) ? cText->seq_num : crSpec->read_seq_num); rv = crSpec->aead( ss->sec.isServer ? &crSpec->client : &crSpec->server, PR_TRUE, /* do decrypt */ plaintext->buf, /* out */ (int *)&plaintext->len, /* outlen */ plaintext->space, /* maxout */ cText->buf->buf, /* in */ cText->buf->len, /* inlen */ aad, sizeof(aad)); if (rv != SECSuccess) { SSL_TRC(3, ("%d: TLS13[%d]: record has bogus MAC", SSL_GETPID(), ss->fd)); PORT_SetError(SSL_ERROR_BAD_MAC_READ); return SECFailure; } /* The record is right-padded with 0s, followed by the true * content type, so read from the right until we receive a * nonzero byte. */ while (plaintext->len > 0 && !(plaintext->buf[plaintext->len - 1])) { --plaintext->len; } /* Bogus padding. */ if (plaintext->len < 1) { SSL_TRC(3, ("%d: TLS13[%d]: empty record", SSL_GETPID(), ss->fd, cText->type)); /* It's safe to report this specifically because it happened * after the MAC has been verified. */ PORT_SetError(SSL_ERROR_BAD_BLOCK_PADDING); return SECFailure; } /* Record the type. */ cText->type = plaintext->buf[plaintext->len - 1]; --plaintext->len; /* Check that we haven't received too much 0-RTT data. */ if (crSpec->epoch == TrafficKeyEarlyApplicationData && cText->type == content_application_data) { if (plaintext->len > crSpec->earlyDataRemaining) { *alert = unexpected_message; PORT_SetError(SSL_ERROR_TOO_MUCH_EARLY_DATA); return SECFailure; } crSpec->earlyDataRemaining -= plaintext->len; } SSL_TRC(10, ("%d: TLS13[%d]: %s received record of length=%d type=%d", SSL_GETPID(), ss->fd, SSL_ROLE(ss), plaintext->len, cText->type)); return SECSuccess; } /* 0-RTT is only permitted if: * * 1. We are doing TLS 1.3 * 2. This isn't a second ClientHello (in response to HelloRetryRequest) * 3. The 0-RTT option is set. * 4. We have a valid ticket. * 5. The server is willing to accept 0-RTT. * 6. We have not changed our ALPN settings to disallow the ALPN tag * in the ticket. * * Called from tls13_ClientSendEarlyDataXtn(). */ PRBool tls13_ClientAllow0Rtt(const sslSocket *ss, const sslSessionID *sid) { /* We checked that the cipher suite was still allowed back in * ssl3_SendClientHello. */ if (sid->version < SSL_LIBRARY_VERSION_TLS_1_3) return PR_FALSE; if (ss->ssl3.hs.helloRetry) return PR_FALSE; if (!ss->opt.enable0RttData) return PR_FALSE; if (!ss->statelessResume) return PR_FALSE; if ((sid->u.ssl3.locked.sessionTicket.flags & ticket_allow_early_data) == 0) return PR_FALSE; return ssl_AlpnTagAllowed(ss, &sid->u.ssl3.alpnSelection); } SECStatus tls13_MaybeDo0RTTHandshake(sslSocket *ss) { SECStatus rv; /* Don't do anything if there is no early_data xtn, which means we're * not doing early data. */ if (!ssl3_ClientExtensionAdvertised(ss, ssl_tls13_early_data_xtn)) { return SECSuccess; } ss->ssl3.hs.zeroRttState = ssl_0rtt_sent; ss->ssl3.hs.zeroRttSuite = ss->ssl3.hs.cipher_suite; SSL_TRC(3, ("%d: TLS13[%d]: in 0-RTT mode", SSL_GETPID(), ss->fd)); /* Set the ALPN data as if it was negotiated. We check in the ServerHello * handler that the server negotiates the same value. */ if (ss->sec.ci.sid->u.ssl3.alpnSelection.len) { ss->xtnData.nextProtoState = SSL_NEXT_PROTO_EARLY_VALUE; rv = SECITEM_CopyItem(NULL, &ss->xtnData.nextProto, &ss->sec.ci.sid->u.ssl3.alpnSelection); if (rv != SECSuccess) return rv; } /* Cipher suite already set in tls13_SetupClientHello. */ ss->ssl3.hs.preliminaryInfo = 0; rv = tls13_DeriveSecret(ss, ss->ssl3.hs.currentSecret, kHkdfLabelClient, kHkdfLabelEarlyTrafficSecret, NULL, &ss->ssl3.hs.clientEarlyTrafficSecret); if (rv != SECSuccess) return SECFailure; rv = tls13_SetCipherSpec(ss, TrafficKeyEarlyApplicationData, CipherSpecWrite, PR_TRUE); if (rv != SECSuccess) { return rv; } return SECSuccess; } PRInt32 tls13_Read0RttData(sslSocket *ss, void *buf, PRInt32 len) { TLS13EarlyData *msg; PORT_Assert(!PR_CLIST_IS_EMPTY(&ss->ssl3.hs.bufferedEarlyData)); msg = (TLS13EarlyData *)PR_NEXT_LINK(&ss->ssl3.hs.bufferedEarlyData); PR_REMOVE_LINK(&msg->link); if (msg->data.len > len) { PORT_SetError(SSL_ERROR_ILLEGAL_PARAMETER_ALERT); return SECFailure; } len = msg->data.len; PORT_Memcpy(buf, msg->data.data, msg->data.len); SECITEM_ZfreeItem(&msg->data, PR_FALSE); PORT_ZFree(msg, sizeof(*msg)); return len; } static SECStatus tls13_SendEndOfEarlyData(sslSocket *ss) { SECStatus rv; SSL_TRC(3, ("%d: TLS13[%d]: send end_of_early_data extension", SSL_GETPID(), ss->fd)); rv = SSL3_SendAlert(ss, alert_warning, end_of_early_data); if (rv != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } ss->ssl3.hs.zeroRttState = ssl_0rtt_done; return SECSuccess; } SECStatus tls13_HandleEndOfEarlyData(sslSocket *ss) { SECStatus rv; if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3 || ss->ssl3.hs.zeroRttState != ssl_0rtt_accepted) { (void)SSL3_SendAlert(ss, alert_fatal, unexpected_message); PORT_SetError(SSL_ERROR_END_OF_EARLY_DATA_ALERT); return SECFailure; } PORT_Assert(TLS13_IN_HS_STATE(ss, ss->opt.requestCertificate ? wait_client_cert : wait_finished)); rv = tls13_SetCipherSpec(ss, TrafficKeyHandshake, CipherSpecRead, PR_FALSE); if (rv != SECSuccess) { PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); return SECFailure; } ss->ssl3.hs.zeroRttState = ssl_0rtt_done; return SECSuccess; } SECStatus tls13_HandleEarlyApplicationData(sslSocket *ss, sslBuffer *origBuf) { TLS13EarlyData *ed; SECItem it = { siBuffer, NULL, 0 }; PORT_Assert(ss->sec.isServer); PORT_Assert(ss->ssl3.hs.zeroRttState == ssl_0rtt_accepted); if (ss->ssl3.hs.zeroRttState != ssl_0rtt_accepted) { /* Belt and suspenders. */ FATAL_ERROR(ss, SEC_ERROR_LIBRARY_FAILURE, internal_error); return SECFailure; } PRINT_BUF(3, (NULL, "Received early application data", origBuf->buf, origBuf->len)); ed = PORT_ZNew(TLS13EarlyData); if (!ed) { FATAL_ERROR(ss, SEC_ERROR_NO_MEMORY, internal_error); return SECFailure; } it.data = origBuf->buf; it.len = origBuf->len; if (SECITEM_CopyItem(NULL, &ed->data, &it) != SECSuccess) { FATAL_ERROR(ss, SEC_ERROR_NO_MEMORY, internal_error); return SECFailure; } PR_APPEND_LINK(&ed->link, &ss->ssl3.hs.bufferedEarlyData); origBuf->len = 0; /* So ssl3_GatherAppDataRecord will keep looping. */ return SECSuccess; } PRUint16 tls13_EncodeDraftVersion(SSL3ProtocolVersion version) { #ifdef TLS_1_3_DRAFT_VERSION if (version == SSL_LIBRARY_VERSION_TLS_1_3) { return 0x7f00 | TLS_1_3_DRAFT_VERSION; } #endif return (PRUint16)version; } /* Pick the highest version we support that is also advertised. */ SECStatus tls13_NegotiateVersion(sslSocket *ss, const TLSExtension *supported_versions) { PRUint16 version; /* Make a copy so we're nondestructive*/ SECItem data = supported_versions->data; SECItem versions; SECStatus rv; rv = ssl3_ConsumeHandshakeVariable(ss, &versions, 1, &data.data, &data.len); if (rv != SECSuccess) { return SECFailure; } if (data.len || !versions.len || (versions.len & 1)) { FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter); return SECFailure; } for (version = ss->vrange.max; version >= ss->vrange.min; --version) { PRUint16 wire = tls13_EncodeDraftVersion(version); unsigned long offset; for (offset = 0; offset < versions.len; offset += 2) { PRUint16 supported = (versions.data[offset] << 8) | versions.data[offset + 1]; if (supported == wire) { ss->version = version; return SECSuccess; } } } FATAL_ERROR(ss, SSL_ERROR_UNSUPPORTED_VERSION, protocol_version); return SECFailure; }