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gecko-dev/security/nss/lib/ssl/tls13con.c

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C
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/* -*- 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, &param,
out, &uOutLen, maxout, in, inlen);
} else {
rv = PK11_Encrypt(keys->write_key, mechanism, &param,
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, &param);
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;
}
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