| /* -*- 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 "tls13esni.h" |
| #include "tls13exthandle.h" |
| |
| SECStatus |
| tls13_ServerSendStatusRequestXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| const sslServerCert *serverCert = ss->sec.serverCert; |
| const SECItem *item; |
| SECStatus rv; |
| |
| if (!serverCert->certStatusArray || |
| !serverCert->certStatusArray->len) { |
| return SECSuccess; |
| } |
| |
| item = &serverCert->certStatusArray->items[0]; |
| |
| /* Only send the first entry. */ |
| /* status_type == ocsp */ |
| rv = sslBuffer_AppendNumber(buf, 1 /*ocsp*/, 1); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| /* opaque OCSPResponse<1..2^24-1> */ |
| rv = sslBuffer_AppendVariable(buf, item->data, item->len, 3); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| /* |
| * [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>; |
| */ |
| 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; |
| } |
| |
| SECStatus |
| tls13_EncodeKeyShareEntry(sslBuffer *buf, SSLNamedGroup group, |
| SECKEYPublicKey *pubKey) |
| { |
| SECStatus rv; |
| unsigned int size = tls13_SizeOfKeyShareEntry(pubKey); |
| |
| rv = sslBuffer_AppendNumber(buf, group, 2); |
| if (rv != SECSuccess) |
| return rv; |
| rv = sslBuffer_AppendNumber(buf, size - 4, 2); |
| if (rv != SECSuccess) |
| return rv; |
| |
| switch (pubKey->keyType) { |
| case ecKey: |
| rv = sslBuffer_Append(buf, pubKey->u.ec.publicValue.data, |
| pubKey->u.ec.publicValue.len); |
| break; |
| case dhKey: |
| rv = ssl_AppendPaddedDHKeyShare(buf, pubKey, PR_FALSE); |
| break; |
| default: |
| PORT_Assert(0); |
| PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); |
| break; |
| } |
| |
| return rv; |
| } |
| |
| SECStatus |
| tls13_ClientSendKeyShareXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| SECStatus rv; |
| PRCList *cursor; |
| unsigned int extStart; |
| unsigned int lengthOffset; |
| |
| if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3) { |
| return SECSuccess; |
| } |
| |
| /* 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)); |
| |
| extStart = SSL_BUFFER_LEN(buf); |
| |
| /* Save the offset to the length. */ |
| rv = sslBuffer_Skip(buf, 2, &lengthOffset); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| for (cursor = PR_NEXT_LINK(&ss->ephemeralKeyPairs); |
| cursor != &ss->ephemeralKeyPairs; |
| cursor = PR_NEXT_LINK(cursor)) { |
| sslEphemeralKeyPair *keyPair = (sslEphemeralKeyPair *)cursor; |
| rv = tls13_EncodeKeyShareEntry(buf, |
| keyPair->group->name, |
| keyPair->keys->pubKey); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| } |
| rv = sslBuffer_InsertLength(buf, lengthOffset, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| rv = SECITEM_MakeItem(NULL, &xtnData->keyShareExtension, |
| SSL_BUFFER_BASE(buf) + extStart, |
| SSL_BUFFER_LEN(buf) - extStart); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_DecodeKeyShareEntry(sslReader *rdr, TLS13KeyShareEntry **ksp) |
| { |
| SECStatus rv; |
| PRUint64 group; |
| const sslNamedGroupDef *groupDef; |
| TLS13KeyShareEntry *ks = NULL; |
| sslReadBuffer share; |
| |
| rv = sslRead_ReadNumber(rdr, 2, &group); |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| groupDef = ssl_LookupNamedGroup(group); |
| rv = sslRead_ReadVariable(rdr, 2, &share); |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| |
| /* This has to happen here because we want to consume |
| * the entire entry even if the group is unknown |
| * or disabled. */ |
| /* If the group is disabled, continue. */ |
| if (!groupDef) { |
| return SECSuccess; |
| } |
| |
| ks = PORT_ZNew(TLS13KeyShareEntry); |
| if (!ks) { |
| goto loser; |
| } |
| ks->group = groupDef; |
| |
| rv = SECITEM_MakeItem(NULL, &ks->key_exchange, |
| share.buf, share.len); |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| |
| *ksp = ks; |
| return SECSuccess; |
| |
| loser: |
| 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, |
| SECItem *data) |
| { |
| SECStatus rv; |
| PORT_Assert(PR_CLIST_IS_EMPTY(&xtnData->remoteKeyShares)); |
| TLS13KeyShareEntry *ks = NULL; |
| |
| PORT_Assert(!ss->sec.isServer); |
| |
| /* The server must not send this extension when negotiating < TLS 1.3. */ |
| if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) { |
| PORT_SetError(SSL_ERROR_EXTENSION_DISALLOWED_FOR_VERSION); |
| return SECFailure; |
| } |
| |
| SSL_TRC(3, ("%d: SSL3[%d]: handle key_share extension", |
| SSL_GETPID(), ss->fd)); |
| |
| sslReader rdr = SSL_READER(data->data, data->len); |
| rv = tls13_DecodeKeyShareEntry(&rdr, &ks); |
| if ((rv != SECSuccess) || !ks) { |
| ssl3_ExtSendAlert(ss, alert_fatal, illegal_parameter); |
| PORT_SetError(SSL_ERROR_RX_MALFORMED_KEY_SHARE); |
| return SECFailure; |
| } |
| |
| if (SSL_READER_REMAINING(&rdr)) { |
| tls13_DestroyKeyShareEntry(ks); |
| PORT_SetError(SSL_ERROR_RX_MALFORMED_KEY_SHARE); |
| return SECFailure; |
| } |
| PR_APPEND_LINK(&ks->link, &xtnData->remoteKeyShares); |
| |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ClientHandleKeyShareXtnHrr(const sslSocket *ss, TLSExtensionData *xtnData, |
| 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_AddKeyShare(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, |
| 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; |
| } |
| |
| sslReader rdr = SSL_READER(data->data, data->len); |
| while (SSL_READER_REMAINING(&rdr)) { |
| TLS13KeyShareEntry *ks = NULL; |
| rv = tls13_DecodeKeyShareEntry(&rdr, &ks); |
| if (rv != SECSuccess) { |
| PORT_SetError(SSL_ERROR_RX_MALFORMED_KEY_SHARE); |
| goto loser; |
| } |
| if (ks) { |
| /* |ks| == NULL if this is an unknown group. */ |
| PR_APPEND_LINK(&ks->link, &xtnData->remoteKeyShares); |
| } |
| } |
| |
| /* Keep track of negotiated extensions. */ |
| xtnData->negotiated[xtnData->numNegotiated++] = |
| ssl_tls13_key_share_xtn; |
| |
| return SECSuccess; |
| |
| loser: |
| tls13_DestroyKeyShares(&xtnData->remoteKeyShares); |
| return SECFailure; |
| } |
| |
| SECStatus |
| tls13_ServerSendKeyShareXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| 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); |
| |
| rv = tls13_EncodeKeyShareEntry(buf, keyPair->group->name, |
| keyPair->keys->pubKey); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| /* 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. |
| */ |
| SECStatus |
| tls13_ClientSendPreSharedKeyXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| NewSessionTicket *session_ticket; |
| PRTime age; |
| const static PRUint8 binder[TLS13_MAX_FINISHED_SIZE] = { 0 }; |
| unsigned int binderLen; |
| SECStatus rv; |
| |
| /* We only set statelessResume on the client in TLS 1.3 code. */ |
| if (!ss->statelessResume) { |
| return SECSuccess; |
| } |
| |
| /* Save where this extension starts so that if we have to add padding, it |
| * can be inserted before this extension. */ |
| PORT_Assert(buf->len >= 4); |
| xtnData->lastXtnOffset = buf->len - 4; |
| |
| PORT_Assert(ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_3); |
| PORT_Assert(ss->sec.ci.sid->version >= SSL_LIBRARY_VERSION_TLS_1_3); |
| |
| /* Send a single ticket identity. */ |
| session_ticket = &ss->sec.ci.sid->u.ssl3.locked.sessionTicket; |
| rv = sslBuffer_AppendNumber(buf, 2 + /* identity length */ |
| session_ticket->ticket.len + /* ticket */ |
| 4 /* obfuscated_ticket_age */, |
| 2); |
| if (rv != SECSuccess) |
| goto loser; |
| rv = sslBuffer_AppendVariable(buf, session_ticket->ticket.data, |
| session_ticket->ticket.len, 2); |
| if (rv != SECSuccess) |
| goto loser; |
| |
| /* Obfuscated age. */ |
| age = ssl_TimeUsec() - session_ticket->received_timestamp; |
| age /= PR_USEC_PER_MSEC; |
| age += session_ticket->ticket_age_add; |
| rv = sslBuffer_AppendNumber(buf, age, 4); |
| if (rv != SECSuccess) |
| goto loser; |
| |
| /* Write out the binder list length. */ |
| binderLen = tls13_GetHashSize(ss); |
| rv = sslBuffer_AppendNumber(buf, binderLen + 1, 2); |
| if (rv != SECSuccess) |
| goto loser; |
| /* Write zeroes for the binder for the moment. */ |
| rv = sslBuffer_AppendVariable(buf, 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; |
| *added = PR_TRUE; |
| return SECSuccess; |
| |
| loser: |
| xtnData->ticketTimestampVerified = PR_FALSE; |
| return SECFailure; |
| } |
| |
| /* Handle a TLS 1.3 PreSharedKey Extension. We only accept PSKs |
| * that contain session tickets. */ |
| SECStatus |
| tls13_ServerHandlePreSharedKeyXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| SECItem *data) |
| { |
| SECItem inner; |
| SECStatus rv; |
| unsigned int numIdentities = 0; |
| unsigned int numBinders = 0; |
| SECItem *appToken; |
| |
| 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; |
| } |
| |
| /* The application token is set via the cookie extension if this is the |
| * second ClientHello. Don't set it twice. The cookie extension handler |
| * sets |helloRetry| and that will have been called already because this |
| * extension always comes last. */ |
| if (!ss->ssl3.hs.helloRetry) { |
| appToken = &xtnData->applicationToken; |
| } else { |
| appToken = NULL; |
| } |
| |
| /* 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 obfuscatedAge; |
| |
| rv = ssl3_ExtConsumeHandshakeVariable(ss, &label, 2, |
| &inner.data, &inner.len); |
| if (rv != SECSuccess) |
| return rv; |
| if (!label.len) { |
| goto alert_loser; |
| } |
| |
| rv = ssl3_ExtConsumeHandshakeNumber(ss, &obfuscatedAge, 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, appToken); |
| /* 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; |
| |
| if (ss->sec.ci.sid) { |
| /* xtnData->ticketAge contains the baseline we use for |
| * calculating the ticket age (i.e., our RTT estimate less the |
| * value of ticket_age_add). |
| * |
| * Add that to the obfuscated ticket age to recover the client's |
| * view of the ticket age plus the estimated RTT. |
| * |
| * See ssl3_EncodeSessionTicket() for details. */ |
| xtnData->ticketAge += obfuscatedAge; |
| } |
| } |
| ++numIdentities; |
| } |
| |
| xtnData->pskBindersLen = 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++] = ssl_tls13_pre_shared_key_xtn; |
| |
| return SECSuccess; |
| |
| alert_loser: |
| ssl3_ExtSendAlert(ss, alert_fatal, illegal_parameter); |
| PORT_SetError(SSL_ERROR_MALFORMED_PRE_SHARED_KEY); |
| return SECFailure; |
| } |
| |
| SECStatus |
| tls13_ServerSendPreSharedKeyXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| SECStatus rv; |
| |
| /* We only process the first session ticket the client sends, |
| * so the index is always 0. */ |
| rv = sslBuffer_AppendNumber(buf, 0, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| /* Handle a TLS 1.3 PreSharedKey Extension. We only accept PSKs |
| * that contain session tickets. */ |
| SECStatus |
| tls13_ClientHandlePreSharedKeyXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| SECItem *data) |
| { |
| PRUint32 index; |
| SECStatus rv; |
| |
| SSL_TRC(3, ("%d: SSL3[%d]: handle pre_shared_key extension", |
| SSL_GETPID(), ss->fd)); |
| |
| /* The server must not send this extension when negotiating < TLS 1.3. */ |
| if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) { |
| PORT_SetError(SSL_ERROR_EXTENSION_DISALLOWED_FOR_VERSION); |
| return SECFailure; |
| } |
| |
| 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++] = ssl_tls13_pre_shared_key_xtn; |
| |
| return SECSuccess; |
| } |
| |
| /* |
| * struct { } EarlyDataIndication; |
| */ |
| SECStatus |
| tls13_ClientSendEarlyDataXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| if (!tls13_ClientAllow0Rtt(ss, ss->sec.ci.sid)) { |
| return SECSuccess; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ServerHandleEarlyDataXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| 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 (ss->ssl3.hs.helloRetry) { |
| ssl3_ExtSendAlert(ss, alert_fatal, unsupported_extension); |
| PORT_SetError(SSL_ERROR_RX_UNEXPECTED_EXTENSION); |
| return SECFailure; |
| } |
| |
| if (data->len) { |
| PORT_SetError(SSL_ERROR_MALFORMED_EARLY_DATA); |
| return SECFailure; |
| } |
| |
| xtnData->negotiated[xtnData->numNegotiated++] = ssl_tls13_early_data_xtn; |
| |
| return SECSuccess; |
| } |
| |
| /* This will only be called if we also offered the extension. */ |
| SECStatus |
| tls13_ClientHandleEarlyDataXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| SECItem *data) |
| { |
| SSL_TRC(3, ("%d: TLS13[%d]: handle early_data extension", |
| SSL_GETPID(), ss->fd)); |
| |
| /* The server must not send this extension when negotiating < TLS 1.3. */ |
| 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++] = ssl_tls13_early_data_xtn; |
| |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ClientHandleTicketEarlyDataXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| SECItem *data) |
| { |
| PRUint32 utmp; |
| SECStatus rv; |
| |
| SSL_TRC(3, ("%d: TLS13[%d]: handle ticket early_data extension", |
| SSL_GETPID(), ss->fd)); |
| |
| /* The server must not send this extension when negotiating < TLS 1.3. */ |
| 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 { |
| * select (Handshake.msg_type) { |
| * case client_hello: |
| * ProtocolVersion versions<2..254>; |
| * case server_hello: |
| * ProtocolVersion version; |
| * }; |
| * } SupportedVersions; |
| */ |
| SECStatus |
| tls13_ClientSendSupportedVersionsXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| PRUint16 version; |
| unsigned int lengthOffset; |
| SECStatus rv; |
| |
| if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3) { |
| return SECSuccess; |
| } |
| |
| SSL_TRC(3, ("%d: TLS13[%d]: client send supported_versions extension", |
| SSL_GETPID(), ss->fd)); |
| |
| rv = sslBuffer_Skip(buf, 1, &lengthOffset); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| for (version = ss->vrange.max; version >= ss->vrange.min; --version) { |
| PRUint16 wire = tls13_EncodeDraftVersion(version, |
| ss->protocolVariant); |
| rv = sslBuffer_AppendNumber(buf, wire, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| } |
| |
| rv = sslBuffer_InsertLength(buf, lengthOffset, 1); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ServerSendSupportedVersionsXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| SECStatus rv; |
| |
| if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) { |
| return SECSuccess; |
| } |
| |
| SSL_TRC(3, ("%d: TLS13[%d]: server send supported_versions extension", |
| SSL_GETPID(), ss->fd)); |
| |
| PRUint16 ver = tls13_EncodeDraftVersion(SSL_LIBRARY_VERSION_TLS_1_3, |
| ss->protocolVariant); |
| rv = sslBuffer_AppendNumber(buf, ver, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| /* |
| * struct { |
| * opaque cookie<1..2^16-1>; |
| * } Cookie; |
| */ |
| SECStatus |
| tls13_ClientHandleHrrCookie(const sslSocket *ss, TLSExtensionData *xtnData, |
| 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; |
| } |
| |
| SECStatus |
| tls13_ClientSendHrrCookieXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| SECStatus rv; |
| |
| if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3 || |
| !ss->ssl3.hs.cookie.len) { |
| return SECSuccess; |
| } |
| |
| SSL_TRC(3, ("%d: TLS13[%d]: send cookie extension", SSL_GETPID(), ss->fd)); |
| rv = sslBuffer_AppendVariable(buf, ss->ssl3.hs.cookie.data, |
| ss->ssl3.hs.cookie.len, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ServerHandleCookieXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| SECItem *data) |
| { |
| SECStatus rv; |
| |
| SSL_TRC(3, ("%d: TLS13[%d]: handle cookie extension", |
| SSL_GETPID(), ss->fd)); |
| |
| rv = ssl3_ExtConsumeHandshakeVariable(ss, &xtnData->cookie, 2, |
| &data->data, &data->len); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| if (xtnData->cookie.len == 0) { |
| PORT_SetError(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO); |
| return SECFailure; |
| } |
| |
| if (data->len) { |
| PORT_SetError(SSL_ERROR_RX_MALFORMED_CLIENT_HELLO); |
| return SECFailure; |
| } |
| |
| /* Keep track of negotiated extensions. */ |
| xtnData->negotiated[xtnData->numNegotiated++] = ssl_tls13_cookie_xtn; |
| |
| return SECSuccess; |
| } |
| |
| /* |
| * enum { psk_ke(0), psk_dhe_ke(1), (255) } PskKeyExchangeMode; |
| * |
| * struct { |
| * PskKeyExchangeMode ke_modes<1..255>; |
| * } PskKeyExchangeModes; |
| */ |
| SECStatus |
| tls13_ClientSendPskModesXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| static const PRUint8 ke_modes[] = { tls13_psk_dh_ke }; |
| SECStatus rv; |
| |
| if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3 || |
| ss->opt.noCache) { |
| return SECSuccess; |
| } |
| |
| SSL_TRC(3, ("%d: TLS13[%d]: send psk key exchange modes extension", |
| SSL_GETPID(), ss->fd)); |
| |
| rv = sslBuffer_AppendVariable(buf, ke_modes, sizeof(ke_modes), 1); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ServerHandlePskModesXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| SECItem *data) |
| { |
| SECStatus rv; |
| |
| /* If we are doing < TLS 1.3, then ignore this. */ |
| if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) { |
| return SECSuccess; |
| } |
| |
| SSL_TRC(3, ("%d: TLS13[%d]: handle PSK key exchange modes extension", |
| SSL_GETPID(), ss->fd)); |
| |
| /* IMPORTANT: We aren't copying these values, just setting pointers. |
| * They will only be valid as long as the ClientHello is in memory. */ |
| rv = ssl3_ExtConsumeHandshakeVariable(ss, |
| &xtnData->psk_ke_modes, 1, |
| &data->data, &data->len); |
| if (rv != SECSuccess) |
| return rv; |
| if (!xtnData->psk_ke_modes.len || data->len) { |
| PORT_SetError(SSL_ERROR_MALFORMED_PSK_KEY_EXCHANGE_MODES); |
| return SECFailure; |
| } |
| |
| /* Keep track of negotiated extensions. */ |
| xtnData->negotiated[xtnData->numNegotiated++] = |
| ssl_tls13_psk_key_exchange_modes_xtn; |
| |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_SendCertAuthoritiesXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| unsigned int calen; |
| const SECItem *name; |
| unsigned int nnames; |
| SECStatus rv; |
| |
| PORT_Assert(ss->version >= SSL_LIBRARY_VERSION_TLS_1_3); |
| |
| rv = ssl_GetCertificateRequestCAs(ss, &calen, &name, &nnames); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| if (!calen) { |
| return SECSuccess; |
| } |
| |
| rv = sslBuffer_AppendNumber(buf, calen, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| while (nnames) { |
| rv = sslBuffer_AppendVariable(buf, name->data, name->len, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| ++name; |
| --nnames; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ClientHandleCertAuthoritiesXtn(const sslSocket *ss, |
| TLSExtensionData *xtnData, |
| SECItem *data) |
| { |
| SECStatus rv; |
| PLArenaPool *arena; |
| |
| if (!data->len) { |
| ssl3_ExtSendAlert(ss, alert_fatal, decode_error); |
| PORT_SetError(SSL_ERROR_RX_MALFORMED_CERT_REQUEST); |
| return SECFailure; |
| } |
| |
| arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE); |
| if (!arena) { |
| PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); |
| return SECFailure; |
| } |
| |
| xtnData->certReqAuthorities.arena = arena; |
| rv = ssl3_ParseCertificateRequestCAs((sslSocket *)ss, |
| &data->data, &data->len, |
| &xtnData->certReqAuthorities); |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| if (data->len) { |
| ssl3_ExtSendAlert(ss, alert_fatal, decode_error); |
| PORT_SetError(SSL_ERROR_RX_MALFORMED_CERT_REQUEST); |
| goto loser; |
| } |
| return SECSuccess; |
| |
| loser: |
| PORT_FreeArena(arena, PR_FALSE); |
| xtnData->certReqAuthorities.arena = NULL; |
| return SECFailure; |
| } |
| |
| SECStatus |
| tls13_ServerSendHrrKeyShareXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| SECStatus rv; |
| |
| PORT_Assert(ss->version >= SSL_LIBRARY_VERSION_TLS_1_3); |
| |
| if (!xtnData->selectedGroup) { |
| return SECSuccess; |
| } |
| |
| rv = sslBuffer_AppendNumber(buf, xtnData->selectedGroup->name, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ServerSendHrrCookieXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| SECStatus rv; |
| |
| PORT_Assert(ss->version >= SSL_LIBRARY_VERSION_TLS_1_3); |
| PORT_Assert(xtnData->cookie.len > 0); |
| |
| rv = sslBuffer_AppendVariable(buf, |
| xtnData->cookie.data, xtnData->cookie.len, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ClientSendEsniXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| SECStatus rv; |
| PRUint8 sniBuf[1024]; |
| PRUint8 hash[64]; |
| sslBuffer sni = SSL_BUFFER(sniBuf); |
| const ssl3CipherSuiteDef *suiteDef; |
| ssl3KeyMaterial keyMat; |
| SSLAEADCipher aead; |
| PRUint8 outBuf[1024]; |
| int outLen; |
| unsigned int sniStart; |
| unsigned int sniLen; |
| sslBuffer aadInput = SSL_BUFFER_EMPTY; |
| unsigned int keyShareBufStart; |
| unsigned int keyShareBufLen; |
| |
| PORT_Memset(&keyMat, 0, sizeof(keyMat)); |
| |
| if (!ss->xtnData.esniPrivateKey) { |
| return SECSuccess; |
| } |
| |
| /* nonce */ |
| rv = PK11_GenerateRandom( |
| (unsigned char *)xtnData->esniNonce, sizeof(xtnData->esniNonce)); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| rv = sslBuffer_Append(&sni, xtnData->esniNonce, sizeof(xtnData->esniNonce)); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| /* sni */ |
| sniStart = SSL_BUFFER_LEN(&sni); |
| rv = ssl3_ClientFormatServerNameXtn(ss, ss->url, xtnData, &sni); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| sniLen = SSL_BUFFER_LEN(&sni) - sniStart; |
| /* Padding. */ |
| if (ss->esniKeys->paddedLength > sniLen) { |
| unsigned int paddingRequired = ss->esniKeys->paddedLength - sniLen; |
| while (paddingRequired--) { |
| rv = sslBuffer_AppendNumber(&sni, 0, 1); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| } |
| } |
| |
| suiteDef = ssl_LookupCipherSuiteDef(xtnData->esniSuite); |
| PORT_Assert(suiteDef); |
| if (!suiteDef) { |
| PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); |
| return SECFailure; |
| } |
| aead = tls13_GetAead(ssl_GetBulkCipherDef(suiteDef)); |
| if (!aead) { |
| return SECFailure; |
| } |
| |
| /* Format the first part of the extension so we have the |
| * encoded KeyShareEntry. */ |
| rv = sslBuffer_AppendNumber(buf, xtnData->esniSuite, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| keyShareBufStart = SSL_BUFFER_LEN(buf); |
| rv = tls13_EncodeKeyShareEntry(buf, |
| xtnData->esniPrivateKey->group->name, |
| xtnData->esniPrivateKey->keys->pubKey); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| keyShareBufLen = SSL_BUFFER_LEN(buf) - keyShareBufStart; |
| |
| if (tls13_GetHashSizeForHash(suiteDef->prf_hash) > sizeof(hash)) { |
| PORT_Assert(PR_FALSE); |
| PORT_SetError(SEC_ERROR_LIBRARY_FAILURE); |
| return SECFailure; |
| } |
| |
| rv = PK11_HashBuf(ssl3_HashTypeToOID(suiteDef->prf_hash), |
| hash, |
| ss->esniKeys->data.data, |
| ss->esniKeys->data.len); |
| if (rv != SECSuccess) { |
| PORT_Assert(PR_FALSE); |
| return SECFailure; |
| } |
| |
| rv = sslBuffer_AppendVariable(buf, hash, |
| tls13_GetHashSizeForHash(suiteDef->prf_hash), 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| /* Compute the ESNI keys. */ |
| rv = tls13_ComputeESNIKeys(ss, xtnData->peerEsniShare, |
| xtnData->esniPrivateKey->keys, |
| suiteDef, |
| hash, |
| SSL_BUFFER_BASE(buf) + keyShareBufStart, |
| keyShareBufLen, |
| CONST_CAST(PRUint8, ss->ssl3.hs.client_random), |
| &keyMat); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| rv = tls13_FormatEsniAADInput(&aadInput, |
| xtnData->keyShareExtension.data, |
| xtnData->keyShareExtension.len); |
| if (rv != SECSuccess) { |
| ssl_DestroyKeyMaterial(&keyMat); |
| return SECFailure; |
| } |
| /* Now encrypt. */ |
| rv = aead(&keyMat, PR_FALSE /* Encrypt */, |
| outBuf, &outLen, sizeof(outBuf), |
| SSL_BUFFER_BASE(&sni), |
| SSL_BUFFER_LEN(&sni), |
| SSL_BUFFER_BASE(&aadInput), |
| SSL_BUFFER_LEN(&aadInput)); |
| ssl_DestroyKeyMaterial(&keyMat); |
| sslBuffer_Clear(&aadInput); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| /* Encode the rest. */ |
| rv = sslBuffer_AppendVariable(buf, outBuf, outLen, 2); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| static SECStatus |
| tls13_ServerSendEsniXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| sslBuffer *buf, PRBool *added) |
| { |
| SECStatus rv; |
| |
| rv = sslBuffer_Append(buf, xtnData->esniNonce, sizeof(xtnData->esniNonce)); |
| if (rv != SECSuccess) { |
| return SECFailure; |
| } |
| |
| *added = PR_TRUE; |
| return SECSuccess; |
| } |
| |
| SECStatus |
| tls13_ServerHandleEsniXtn(const sslSocket *ss, TLSExtensionData *xtnData, |
| SECItem *data) |
| { |
| sslReadBuffer buf; |
| PRUint8 *plainText = NULL; |
| int ptLen; |
| SECStatus rv; |
| |
| /* If we are doing < TLS 1.3, then ignore this. */ |
| if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3) { |
| return SECSuccess; |
| } |
| |
| if (!ss->esniKeys) { |
| /* Apparently we used to be configured for ESNI, but |
| * no longer. This violates the spec, or the client is |
| * broken. */ |
| return SECFailure; |
| } |
| |
| plainText = PORT_ZAlloc(data->len); |
| if (!plainText) { |
| return SECFailure; |
| } |
| rv = tls13_ServerDecryptEsniXtn(ss, data->data, data->len, |
| plainText, &ptLen, data->len); |
| if (rv) { |
| goto loser; |
| } |
| |
| /* Read out the interior extension. */ |
| sslReader sniRdr = SSL_READER(plainText, ptLen); |
| |
| rv = sslRead_Read(&sniRdr, sizeof(xtnData->esniNonce), &buf); |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| PORT_Memcpy(xtnData->esniNonce, buf.buf, sizeof(xtnData->esniNonce)); |
| |
| /* We need to capture the whole block with the length. */ |
| SECItem sniItem = { siBuffer, (unsigned char *)SSL_READER_CURRENT(&sniRdr), 0 }; |
| rv = sslRead_ReadVariable(&sniRdr, 2, &buf); |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| sniItem.len = buf.len + 2; |
| |
| /* Check the padding. Note we don't need to do this in constant time |
| * because it's inside the AEAD boundary. */ |
| /* TODO(ekr@rtfm.com): check that the padding is the right length. */ |
| PRUint64 tmp; |
| while (SSL_READER_REMAINING(&sniRdr)) { |
| rv = sslRead_ReadNumber(&sniRdr, 1, &tmp); |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| if (tmp != 0) { |
| goto loser; |
| } |
| } |
| |
| rv = ssl3_HandleServerNameXtn(ss, xtnData, &sniItem); |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| |
| rv = ssl3_RegisterExtensionSender(ss, xtnData, |
| ssl_tls13_encrypted_sni_xtn, |
| tls13_ServerSendEsniXtn); |
| if (rv != SECSuccess) { |
| goto loser; |
| } |
| |
| /* Keep track of negotiated extensions. */ |
| xtnData->negotiated[xtnData->numNegotiated++] = |
| ssl_tls13_encrypted_sni_xtn; |
| |
| PORT_ZFree(plainText, data->len); |
| return SECSuccess; |
| loser: |
| PORT_ZFree(plainText, data->len); |
| return SECFailure; |
| } |
| |
| /* Function to check the extension. We don't install a handler here |
| * because we need to check for the presence of the extension as |
| * well and it's easier to do it in one place. */ |
| SECStatus |
| tls13_ClientCheckEsniXtn(sslSocket *ss) |
| { |
| TLSExtension *esniExtension = |
| ssl3_FindExtension(ss, ssl_tls13_encrypted_sni_xtn); |
| if (!esniExtension) { |
| FATAL_ERROR(ss, SSL_ERROR_MISSING_ESNI_EXTENSION, missing_extension); |
| return SECFailure; |
| } |
| |
| if (esniExtension->data.len != sizeof(ss->xtnData.esniNonce)) { |
| FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_ESNI_EXTENSION, illegal_parameter); |
| return SECFailure; |
| } |
| |
| if (0 != NSS_SecureMemcmp(esniExtension->data.data, |
| ss->xtnData.esniNonce, |
| sizeof(ss->xtnData.esniNonce))) { |
| FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_ESNI_EXTENSION, illegal_parameter); |
| return SECFailure; |
| } |
| |
| return SECSuccess; |
| } |
