/
tls13exthandle.c
1072 lines (901 loc) · 31.2 KB
/
tls13exthandle.c
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* 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 "nssrenam.h"
#include "nss.h"
#include "ssl.h"
#include "sslproto.h"
#include "sslimpl.h"
#include "pk11pub.h"
#include "ssl3ext.h"
#include "ssl3exthandle.h"
#include "tls13exthandle.h"
PRInt32
tls13_ServerSendStatusRequestXtn(
const sslSocket *ss,
TLSExtensionData *xtnData,
PRBool append,
PRUint32 maxBytes)
{
PRInt32 extension_length;
const sslServerCert *serverCert = ss->sec.serverCert;
const SECItem *item;
SECStatus rv;
if (!serverCert->certStatusArray ||
!serverCert->certStatusArray->len) {
return 0;
}
item = &serverCert->certStatusArray->items[0];
/* Only send the first entry. */
extension_length = 2 + 2 + 1 /* status_type */ + 3 + item->len;
if (maxBytes < (PRUint32)extension_length) {
return 0;
}
if (append) {
/* extension_type */
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_cert_status_xtn, 2);
if (rv != SECSuccess)
return -1;
/* length of extension_data */
rv = ssl3_ExtAppendHandshakeNumber(ss, extension_length - 4, 2);
if (rv != SECSuccess)
return -1;
/* status_type == ocsp */
rv = ssl3_ExtAppendHandshakeNumber(ss, 1 /*ocsp*/, 1);
if (rv != SECSuccess)
return rv; /* err set by AppendHandshake. */
/* opaque OCSPResponse<1..2^24-1> */
rv = ssl3_ExtAppendHandshakeVariable(ss, item->data, item->len, 3);
if (rv != SECSuccess)
return rv; /* err set by AppendHandshake. */
}
return extension_length;
}
/*
* [draft-ietf-tls-tls13-11] Section 6.3.2.3.
*
* struct {
* NamedGroup group;
* opaque key_exchange<1..2^16-1>;
* } KeyShareEntry;
*
* struct {
* select (role) {
* case client:
* KeyShareEntry client_shares<4..2^16-1>;
*
* case server:
* KeyShareEntry server_share;
* }
* } KeyShare;
*
* DH is Section 6.3.2.3.1.
*
* opaque dh_Y<1..2^16-1>;
*
* ECDH is Section 6.3.2.3.2.
*
* opaque point <1..2^8-1>;
*/
static PRUint32
tls13_SizeOfKeyShareEntry(const SECKEYPublicKey *pubKey)
{
/* Size = NamedGroup(2) + length(2) + opaque<?> share */
switch (pubKey->keyType) {
case ecKey:
return 2 + 2 + pubKey->u.ec.publicValue.len;
case dhKey:
return 2 + 2 + pubKey->u.dh.prime.len;
default:
PORT_Assert(0);
}
return 0;
}
static PRUint32
tls13_SizeOfClientKeyShareExtension(const sslSocket *ss)
{
PRCList *cursor;
/* Size is: extension(2) + extension_len(2) + client_shares(2) */
PRUint32 size = 2 + 2 + 2;
for (cursor = PR_NEXT_LINK(&ss->ephemeralKeyPairs);
cursor != &ss->ephemeralKeyPairs;
cursor = PR_NEXT_LINK(cursor)) {
sslEphemeralKeyPair *keyPair = (sslEphemeralKeyPair *)cursor;
size += tls13_SizeOfKeyShareEntry(keyPair->keys->pubKey);
}
return size;
}
static SECStatus
tls13_EncodeKeyShareEntry(const sslSocket *ss, const sslEphemeralKeyPair *keyPair)
{
SECStatus rv;
SECKEYPublicKey *pubKey = keyPair->keys->pubKey;
unsigned int size = tls13_SizeOfKeyShareEntry(pubKey);
rv = ssl3_ExtAppendHandshakeNumber(ss, keyPair->group->name, 2);
if (rv != SECSuccess)
return rv;
rv = ssl3_ExtAppendHandshakeNumber(ss, size - 4, 2);
if (rv != SECSuccess)
return rv;
switch (pubKey->keyType) {
case ecKey:
rv = tls13_EncodeECDHEKeyShareKEX(ss, pubKey);
break;
case dhKey:
rv = ssl_AppendPaddedDHKeyShare(ss, pubKey, PR_FALSE);
break;
default:
PORT_Assert(0);
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
break;
}
return rv;
}
PRInt32
tls13_ClientSendKeyShareXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRBool append,
PRUint32 maxBytes)
{
PRUint32 extension_length;
if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3) {
return 0;
}
/* Optimistically try to send an ECDHE key using the
* preexisting key (in future will be keys) */
SSL_TRC(3, ("%d: TLS13[%d]: send client key share xtn",
SSL_GETPID(), ss->fd));
extension_length = tls13_SizeOfClientKeyShareExtension(ss);
if (maxBytes < extension_length) {
PORT_Assert(0);
return 0;
}
if (append) {
SECStatus rv;
PRCList *cursor;
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_tls13_key_share_xtn, 2);
if (rv != SECSuccess)
goto loser;
/* The extension length */
rv = ssl3_ExtAppendHandshakeNumber(ss, extension_length - 4, 2);
if (rv != SECSuccess)
goto loser;
/* The length of KeyShares */
rv = ssl3_ExtAppendHandshakeNumber(ss, extension_length - 6, 2);
if (rv != SECSuccess)
goto loser;
for (cursor = PR_NEXT_LINK(&ss->ephemeralKeyPairs);
cursor != &ss->ephemeralKeyPairs;
cursor = PR_NEXT_LINK(cursor)) {
sslEphemeralKeyPair *keyPair = (sslEphemeralKeyPair *)cursor;
rv = tls13_EncodeKeyShareEntry(ss, keyPair);
if (rv != SECSuccess)
goto loser;
}
xtnData->advertised[xtnData->numAdvertised++] =
ssl_tls13_key_share_xtn;
}
return extension_length;
loser:
return -1;
}
static SECStatus
tls13_HandleKeyShareEntry(const sslSocket *ss, TLSExtensionData *xtnData, SECItem *data)
{
SECStatus rv;
PRUint32 group;
const sslNamedGroupDef *groupDef;
TLS13KeyShareEntry *ks = NULL;
SECItem share = { siBuffer, NULL, 0 };
rv = ssl3_ExtConsumeHandshakeNumber(ss, &group, 2, &data->data, &data->len);
if (rv != SECSuccess) {
PORT_SetError(SSL_ERROR_RX_MALFORMED_KEY_SHARE);
goto loser;
}
groupDef = ssl_LookupNamedGroup(group);
rv = ssl3_ExtConsumeHandshakeVariable(ss, &share, 2, &data->data,
&data->len);
if (rv != SECSuccess) {
goto loser;
}
/* If the group is disabled, continue. */
if (!groupDef) {
return SECSuccess;
}
ks = PORT_ZNew(TLS13KeyShareEntry);
if (!ks)
goto loser;
ks->group = groupDef;
rv = SECITEM_CopyItem(NULL, &ks->key_exchange, &share);
if (rv != SECSuccess)
goto loser;
PR_APPEND_LINK(&ks->link, &xtnData->remoteKeyShares);
return SECSuccess;
loser:
if (ks)
tls13_DestroyKeyShareEntry(ks);
return SECFailure;
}
/* Handle an incoming KeyShare extension at the client and copy to
* |xtnData->remoteKeyShares| for future use. The key
* share is processed in tls13_HandleServerKeyShare(). */
SECStatus
tls13_ClientHandleKeyShareXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type, SECItem *data)
{
SECStatus rv;
PORT_Assert(PR_CLIST_IS_EMPTY(&xtnData->remoteKeyShares));
PORT_Assert(!ss->sec.isServer);
if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
/* This can't happen because the extension processing
* code filters out TLS 1.3 extensions when not in
* TLS 1.3 mode. */
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
return SECFailure;
}
SSL_TRC(3, ("%d: SSL3[%d]: handle key_share extension",
SSL_GETPID(), ss->fd));
rv = tls13_HandleKeyShareEntry(ss, xtnData, data);
if (rv != SECSuccess) {
PORT_SetError(SSL_ERROR_RX_MALFORMED_KEY_SHARE);
return SECFailure;
}
if (data->len) {
PORT_SetError(SSL_ERROR_RX_MALFORMED_KEY_SHARE);
return SECFailure;
}
return SECSuccess;
}
SECStatus
tls13_ClientHandleKeyShareXtnHrr(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type, SECItem *data)
{
SECStatus rv;
PRUint32 tmp;
const sslNamedGroupDef *group;
PORT_Assert(!ss->sec.isServer);
PORT_Assert(ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3);
SSL_TRC(3, ("%d: SSL3[%d]: handle key_share extension in HRR",
SSL_GETPID(), ss->fd));
rv = ssl3_ExtConsumeHandshakeNumber(ss, &tmp, 2, &data->data, &data->len);
if (rv != SECSuccess) {
return SECFailure; /* error code already set */
}
if (data->len) {
ssl3_ExtSendAlert(ss, alert_fatal, decode_error);
PORT_SetError(SSL_ERROR_RX_MALFORMED_HELLO_RETRY_REQUEST);
return SECFailure;
}
group = ssl_LookupNamedGroup((SSLNamedGroup)tmp);
/* If the group is not enabled, or we already have a share for the
* requested group, abort. */
if (!ssl_NamedGroupEnabled(ss, group) ||
ssl_HaveEphemeralKeyPair(ss, group)) {
ssl3_ExtSendAlert(ss, alert_fatal, illegal_parameter);
PORT_SetError(SSL_ERROR_RX_MALFORMED_HELLO_RETRY_REQUEST);
return SECFailure;
}
/* Now delete all the key shares per [draft-ietf-tls-tls13 S 4.1.2] */
ssl_FreeEphemeralKeyPairs(CONST_CAST(sslSocket, ss));
/* And replace with our new share. */
rv = tls13_CreateKeyShare(CONST_CAST(sslSocket, ss), group);
if (rv != SECSuccess) {
ssl3_ExtSendAlert(ss, alert_fatal, internal_error);
PORT_SetError(SEC_ERROR_KEYGEN_FAIL);
return SECFailure;
}
return SECSuccess;
}
/* Handle an incoming KeyShare extension at the server and copy to
* |xtnData->remoteKeyShares| for future use. The key
* share is processed in tls13_HandleClientKeyShare(). */
SECStatus
tls13_ServerHandleKeyShareXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type, SECItem *data)
{
SECStatus rv;
PRUint32 length;
PORT_Assert(ss->sec.isServer);
PORT_Assert(PR_CLIST_IS_EMPTY(&xtnData->remoteKeyShares));
if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
return SECSuccess;
}
SSL_TRC(3, ("%d: SSL3[%d]: handle key_share extension",
SSL_GETPID(), ss->fd));
/* Redundant length because of TLS encoding (this vector consumes
* the entire extension.) */
rv = ssl3_ExtConsumeHandshakeNumber(ss, &length, 2, &data->data,
&data->len);
if (rv != SECSuccess)
goto loser;
if (length != data->len) {
/* Check for consistency */
PORT_SetError(SSL_ERROR_RX_MALFORMED_KEY_SHARE);
goto loser;
}
while (data->len) {
rv = tls13_HandleKeyShareEntry(ss, xtnData, data);
if (rv != SECSuccess)
goto loser;
}
/* Check that the client only offered one share if this is
* after HRR. */
if (ss->ssl3.hs.helloRetry) {
if (PR_PREV_LINK(&xtnData->remoteKeyShares) !=
PR_NEXT_LINK(&xtnData->remoteKeyShares)) {
PORT_SetError(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO);
goto loser;
}
}
return SECSuccess;
loser:
tls13_DestroyKeyShares(&xtnData->remoteKeyShares);
return SECFailure;
}
PRInt32
tls13_ServerSendKeyShareXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRBool append,
PRUint32 maxBytes)
{
PRUint32 extension_length;
PRUint32 entry_length;
SECStatus rv;
sslEphemeralKeyPair *keyPair;
/* There should be 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);
entry_length = tls13_SizeOfKeyShareEntry(keyPair->keys->pubKey);
extension_length = 2 + 2 + entry_length; /* Type + length + entry_length */
if (maxBytes < extension_length) {
PORT_Assert(0);
return 0;
}
if (append) {
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_tls13_key_share_xtn, 2);
if (rv != SECSuccess)
goto loser;
rv = ssl3_ExtAppendHandshakeNumber(ss, entry_length, 2);
if (rv != SECSuccess)
goto loser;
rv = tls13_EncodeKeyShareEntry(ss, keyPair);
if (rv != SECSuccess)
goto loser;
}
return extension_length;
loser:
return -1;
}
/* Called by clients.
*
* struct {
* opaque identity<0..2^16-1>;
* uint32 obfuscated_ticket_age;
* } PskIdentity;
*
* opaque PskBinderEntry<32..255>;
*
* struct {
* select (Handshake.msg_type) {
* case client_hello:
* PskIdentity identities<6..2^16-1>;
* PskBinderEntry binders<33..2^16-1>;
*
* case server_hello:
* uint16 selected_identity;
* };
*
* } PreSharedKeyExtension;
* Presently the only way to get a PSK is by resumption, so this is
* really a ticket label and there will be at most one.
*/
PRInt32
tls13_ClientSendPreSharedKeyXtn(const sslSocket *ss, TLSExtensionData *xtnData,
PRBool append,
PRUint32 maxBytes)
{
PRInt32 extension_length;
PRInt32 identities_length;
PRInt32 binders_length;
NewSessionTicket *session_ticket;
/* We only set statelessResume on the client in TLS 1.3 code. */
if (!ss->statelessResume)
return 0;
PORT_Assert(ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3);
/* The length computations are simplified by the fact that there
* is just one ticket at most. */
session_ticket = &ss->sec.ci.sid->u.ssl3.locked.sessionTicket;
identities_length =
2 + /* vector length */
2 + session_ticket->ticket.len + /* identity length + ticket len */
4; /* obfuscated_ticket_age */
binders_length =
2 + /* vector length */
1 + tls13_GetHashSizeForHash(
tls13_GetHashForCipherSuite(ss->sec.ci.sid->u.ssl3.cipherSuite));
extension_length =
2 + 2 + /* Type + length */
identities_length + binders_length;
if (maxBytes < (PRUint32)extension_length) {
PORT_Assert(0);
return 0;
}
if (append) {
SECStatus rv;
PRUint32 age;
unsigned int prefixLength;
PRUint8 binder[TLS13_MAX_FINISHED_SIZE];
unsigned int binderLen;
/* extension_type */
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_tls13_pre_shared_key_xtn, 2);
if (rv != SECSuccess)
goto loser;
rv = ssl3_ExtAppendHandshakeNumber(ss, extension_length - 4, 2);
if (rv != SECSuccess)
goto loser;
rv = ssl3_ExtAppendHandshakeNumber(ss, identities_length - 2, 2);
if (rv != SECSuccess)
goto loser;
rv = ssl3_ExtAppendHandshakeVariable(ss, session_ticket->ticket.data,
session_ticket->ticket.len, 2);
if (rv != SECSuccess)
goto loser;
/* Obfuscated age. */
age = ssl_Time() - session_ticket->received_timestamp;
age += session_ticket->ticket_age_add;
rv = ssl3_ExtAppendHandshakeNumber(ss, age, 4);
if (rv != SECSuccess)
goto loser;
/* Now the binders. */
prefixLength = ss->ssl3.hs.messages.len;
rv = tls13_ComputePskBinder(CONST_CAST(sslSocket, ss), PR_TRUE,
prefixLength, binder, &binderLen,
sizeof(binder));
if (rv != SECSuccess)
goto loser;
PORT_Assert(binderLen == tls13_GetHashSize(ss));
rv = ssl3_ExtAppendHandshakeNumber(ss, binders_length - 2, 2);
if (rv != SECSuccess)
goto loser;
rv = ssl3_ExtAppendHandshakeVariable(ss,
binder, binderLen, 1);
if (rv != SECSuccess)
goto loser;
PRINT_BUF(50, (ss, "Sending PreSharedKey value",
session_ticket->ticket.data,
session_ticket->ticket.len));
xtnData->sentSessionTicketInClientHello = PR_TRUE;
xtnData->advertised[xtnData->numAdvertised++] =
ssl_tls13_pre_shared_key_xtn;
}
return extension_length;
loser:
xtnData->ticketTimestampVerified = PR_FALSE;
return -1;
}
/* Handle a TLS 1.3 PreSharedKey Extension. We only accept PSKs
* that contain session tickets. */
SECStatus
tls13_ServerHandlePreSharedKeyXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type,
SECItem *data)
{
SECItem inner;
SECStatus rv;
unsigned int numIdentities = 0;
unsigned int numBinders = 0;
SSL_TRC(3, ("%d: SSL3[%d]: handle pre_shared_key extension",
SSL_GETPID(), ss->fd));
/* If we are doing < TLS 1.3, then ignore this. */
if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
return SECSuccess;
}
/* Parse the identities list. */
rv = ssl3_ExtConsumeHandshakeVariable(ss,
&inner, 2, &data->data, &data->len);
if (rv != SECSuccess) {
return SECFailure;
}
while (inner.len) {
SECItem label;
PRUint32 utmp;
rv = ssl3_ExtConsumeHandshakeVariable(ss, &label, 2,
&inner.data, &inner.len);
if (rv != SECSuccess)
return rv;
if (!label.len) {
goto alert_loser;
}
/* Read and discard session ticket age. Bug 1295163 */
rv = ssl3_ExtConsumeHandshake(ss, &utmp, 4,
&inner.data, &inner.len);
if (rv != SECSuccess)
return rv;
if (!numIdentities) {
PRINT_BUF(50, (ss, "Handling PreSharedKey value",
label.data, label.len));
rv = ssl3_ProcessSessionTicketCommon(
CONST_CAST(sslSocket, ss), &label);
/* This only happens if we have an internal error, not
* a malformed ticket. Bogus tickets just don't resume
* and return SECSuccess. */
if (rv != SECSuccess)
return SECFailure;
}
++numIdentities;
}
xtnData->pskBinderPrefixLen = ss->ssl3.hs.messages.len - data->len;
/* Parse the binders list. */
rv = ssl3_ExtConsumeHandshakeVariable(ss,
&inner, 2, &data->data, &data->len);
if (rv != SECSuccess)
return SECFailure;
if (data->len) {
goto alert_loser;
}
while (inner.len) {
SECItem binder;
rv = ssl3_ExtConsumeHandshakeVariable(ss, &binder, 1,
&inner.data, &inner.len);
if (rv != SECSuccess)
return rv;
if (binder.len < 32) {
goto alert_loser;
}
if (!numBinders) {
xtnData->pskBinder = binder;
}
++numBinders;
}
if (numBinders != numIdentities)
goto alert_loser;
/* Keep track of negotiated extensions. Note that this does not
* mean we are resuming. */
xtnData->negotiated[xtnData->numNegotiated++] = ex_type;
return SECSuccess;
alert_loser:
ssl3_ExtSendAlert(ss, alert_fatal, illegal_parameter);
PORT_SetError(SSL_ERROR_MALFORMED_PRE_SHARED_KEY);
return SECFailure;
}
PRInt32
tls13_ServerSendPreSharedKeyXtn(const sslSocket *ss, TLSExtensionData *xtnData,
PRBool append,
PRUint32 maxBytes)
{
PRInt32 extension_length =
2 + 2 + 2; /* type + len + index */
SECStatus rv;
if (maxBytes < (PRUint32)extension_length) {
PORT_Assert(0);
return 0;
}
if (append) {
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_tls13_pre_shared_key_xtn, 2);
if (rv != SECSuccess)
return -1;
rv = ssl3_ExtAppendHandshakeNumber(ss, 2, 2);
if (rv != SECSuccess)
return -1;
/* We only process the first session ticket the client sends,
* so the index is always 0. */
rv = ssl3_ExtAppendHandshakeNumber(ss, 0, 2);
if (rv != SECSuccess)
return -1;
}
return extension_length;
}
/* Handle a TLS 1.3 PreSharedKey Extension. We only accept PSKs
* that contain session tickets. */
SECStatus
tls13_ClientHandlePreSharedKeyXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type,
SECItem *data)
{
PRUint32 index;
SECStatus rv;
SSL_TRC(3, ("%d: SSL3[%d]: handle pre_shared_key extension",
SSL_GETPID(), ss->fd));
/* If we are doing < TLS 1.3, then ignore this. */
if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
return SECSuccess;
}
rv = ssl3_ExtConsumeHandshakeNumber(ss, &index, 2, &data->data, &data->len);
if (rv != SECSuccess)
return SECFailure;
/* This should be the end of the extension. */
if (data->len) {
PORT_SetError(SSL_ERROR_MALFORMED_PRE_SHARED_KEY);
return SECFailure;
}
/* We only sent one PSK label so index must be equal to 0 */
if (index) {
PORT_SetError(SSL_ERROR_MALFORMED_PRE_SHARED_KEY);
return SECFailure;
}
/* Keep track of negotiated extensions. */
xtnData->negotiated[xtnData->numNegotiated++] = ex_type;
return SECSuccess;
}
/*
* struct { } EarlyDataIndication;
*/
PRInt32
tls13_ClientSendEarlyDataXtn(const sslSocket *ss, TLSExtensionData *xtnData,
PRBool append,
PRUint32 maxBytes)
{
SECStatus rv;
PRInt32 extension_length;
if (!tls13_ClientAllow0Rtt(ss, ss->sec.ci.sid))
return 0;
/* type + length */
extension_length = 2 + 2;
if (maxBytes < (PRUint32)extension_length) {
PORT_Assert(0);
return 0;
}
if (append) {
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_tls13_early_data_xtn, 2);
if (rv != SECSuccess)
return -1;
rv = ssl3_ExtAppendHandshakeNumber(ss, 0, 2);
if (rv != SECSuccess)
return -1;
}
xtnData->advertised[xtnData->numAdvertised++] =
ssl_tls13_early_data_xtn;
return extension_length;
}
SECStatus
tls13_ServerHandleEarlyDataXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type,
SECItem *data)
{
SSL_TRC(3, ("%d: TLS13[%d]: handle early_data extension",
SSL_GETPID(), ss->fd));
/* If we are doing < TLS 1.3, then ignore this. */
if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
return SECSuccess;
}
if (data->len) {
PORT_SetError(SSL_ERROR_MALFORMED_EARLY_DATA);
return SECFailure;
}
xtnData->negotiated[xtnData->numNegotiated++] = ex_type;
return SECSuccess;
}
/* This is only registered if we are sending it. */
PRInt32
tls13_ServerSendEarlyDataXtn(const sslSocket *ss, TLSExtensionData *xtnData,
PRBool append,
PRUint32 maxBytes)
{
SSL_TRC(3, ("%d: TLS13[%d]: send early_data extension",
SSL_GETPID(), ss->fd));
PORT_Assert(ss->ssl3.hs.zeroRttState == ssl_0rtt_accepted);
if (maxBytes < 4) {
PORT_Assert(0);
return 0;
}
if (append) {
SECStatus rv;
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_tls13_early_data_xtn, 2);
if (rv != SECSuccess)
return -1;
rv = ssl3_ExtAppendHandshakeNumber(ss, 0, 2);
if (rv != SECSuccess)
return -1;
}
return 4;
}
/* This will only be called if we also offered the extension. */
SECStatus
tls13_ClientHandleEarlyDataXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type,
SECItem *data)
{
SSL_TRC(3, ("%d: TLS13[%d]: handle early_data extension",
SSL_GETPID(), ss->fd));
/* If we are doing < TLS 1.3, then ignore this. */
if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
PORT_SetError(SSL_ERROR_EXTENSION_DISALLOWED_FOR_VERSION);
return SECFailure;
}
if (data->len) {
PORT_SetError(SSL_ERROR_MALFORMED_EARLY_DATA);
return SECFailure;
}
/* Keep track of negotiated extensions. */
xtnData->negotiated[xtnData->numNegotiated++] = ex_type;
return SECSuccess;
}
SECStatus
tls13_ClientHandleTicketEarlyDataInfoXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type,
SECItem *data)
{
PRUint32 utmp;
SECStatus rv;
SSL_TRC(3, ("%d: TLS13[%d]: handle early_data_info extension",
SSL_GETPID(), ss->fd));
/* If we are doing < TLS 1.3, then ignore this. */
if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) {
PORT_SetError(SSL_ERROR_EXTENSION_DISALLOWED_FOR_VERSION);
return SECFailure;
}
rv = ssl3_ExtConsumeHandshake(ss, &utmp, sizeof(utmp),
&data->data, &data->len);
if (rv != SECSuccess) {
PORT_SetError(SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET);
return SECFailure;
}
if (data->len) {
PORT_SetError(SSL_ERROR_RX_MALFORMED_NEW_SESSION_TICKET);
return SECFailure;
}
xtnData->max_early_data_size = PR_ntohl(utmp);
return SECSuccess;
}
/*
* struct {
* ProtocolVersion versions<2..254>;
* } SupportedVersions;
*/
PRInt32
tls13_ClientSendSupportedVersionsXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRBool append,
PRUint32 maxBytes)
{
PRInt32 extensions_len;
PRUint16 version;
SECStatus rv;
if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3) {
return 0;
}
SSL_TRC(3, ("%d: TLS13[%d]: send supported_versions extension",
SSL_GETPID(), ss->fd));
/* Extension type, extension len fiels, vector len field,
* length of the values. */
extensions_len = 2 + 2 + 1 +
2 * (ss->vrange.max - ss->vrange.min + 1);
if (maxBytes < (PRUint32)extensions_len) {
PORT_Assert(0);
return 0;
}
if (append) {
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_tls13_supported_versions_xtn, 2);
if (rv != SECSuccess)
return -1;
rv = ssl3_ExtAppendHandshakeNumber(ss, extensions_len - 4, 2);
if (rv != SECSuccess)
return -1;
rv = ssl3_ExtAppendHandshakeNumber(ss, extensions_len - 5, 1);
if (rv != SECSuccess)
return -1;
for (version = ss->vrange.max; version >= ss->vrange.min; --version) {
rv = ssl3_ExtAppendHandshakeNumber(
ss, tls13_EncodeDraftVersion(version), 2);
if (rv != SECSuccess)
return -1;
}
}
return extensions_len;
}
/*
* struct {
* opaque cookie<1..2^16-1>;
* } Cookie;
*/
SECStatus
tls13_ClientHandleHrrCookie(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type, SECItem *data)
{
SECStatus rv;
SSL_TRC(3, ("%d: TLS13[%d]: handle cookie extension",
SSL_GETPID(), ss->fd));
PORT_Assert(ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3);
/* IMPORTANT: this is only valid while the HelloRetryRequest is still valid. */
rv = ssl3_ExtConsumeHandshakeVariable(
ss, &CONST_CAST(sslSocket, ss)->ssl3.hs.cookie, 2,
&data->data, &data->len);
if (rv != SECSuccess) {
PORT_SetError(SSL_ERROR_RX_MALFORMED_HELLO_RETRY_REQUEST);
return SECFailure;
}
if (!ss->ssl3.hs.cookie.len || data->len) {
ssl3_ExtSendAlert(ss, alert_fatal, decode_error);
PORT_SetError(SSL_ERROR_RX_MALFORMED_HELLO_RETRY_REQUEST);
return SECFailure;
}
return SECSuccess;
}
PRInt32
tls13_ClientSendHrrCookieXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRBool append, PRUint32 maxBytes)
{
PRInt32 extension_len;
if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3 ||
!ss->ssl3.hs.cookie.len) {
return 0;
}
SSL_TRC(3, ("%d: TLS13[%d]: send cookie extension", SSL_GETPID(), ss->fd));
/* Extension type, length, cookie length, cookie value. */
extension_len = 2 + 2 + 2 + ss->ssl3.hs.cookie.len;
if (maxBytes < (PRUint32)extension_len) {
PORT_Assert(0);
return 0;
}
if (append) {
SECStatus rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_tls13_cookie_xtn, 2);
if (rv != SECSuccess)
return -1;
rv = ssl3_ExtAppendHandshakeNumber(ss, extension_len - 4, 2);
if (rv != SECSuccess)
return -1;
rv = ssl3_ExtAppendHandshakeVariable(ss, ss->ssl3.hs.cookie.data,
ss->ssl3.hs.cookie.len, 2);
if (rv != SECSuccess)
return -1;
}
return extension_len;
}
/*
* enum { psk_ke(0), psk_dhe_ke(1), (255) } PskKeyExchangeMode;
*
* struct {
* PskKeyExchangeMode ke_modes<1..255>;
* } PskKeyExchangeModes;
*/
PRInt32
tls13_ClientSendPskKeyExchangeModesXtn(const sslSocket *ss,
TLSExtensionData *xtnData,
PRBool append, PRUint32 maxBytes)