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ssl3exthandle.c
2481 lines (2188 loc) · 82.2 KB
/
ssl3exthandle.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 "blapit.h"
#include "prinit.h"
#include "ssl3ext.h"
#include "ssl3exthandle.h"
#include "tls13exthandle.h" /* For tls13_ServerSendStatusRequestXtn. */
static SECStatus ssl3_ParseEncryptedSessionTicket(sslSocket *ss,
SECItem *data, EncryptedSessionTicket *enc_session_ticket);
static SECStatus ssl3_AppendToItem(SECItem *item, const unsigned char *buf,
PRUint32 bytes);
static SECStatus ssl3_ConsumeFromItem(SECItem *item, unsigned char **buf, PRUint32 bytes);
static SECStatus ssl3_AppendNumberToItem(SECItem *item, PRUint32 num,
PRInt32 lenSize);
static SECStatus ssl3_ConsumeFromItem(SECItem *item, unsigned char **buf, PRUint32 bytes);
/*
* Write bytes. Using this function means the SECItem structure
* cannot be freed. The caller is expected to call this function
* on a shallow copy of the structure.
*/
static SECStatus
ssl3_AppendToItem(SECItem *item, const unsigned char *buf, PRUint32 bytes)
{
if (bytes > item->len)
return SECFailure;
PORT_Memcpy(item->data, buf, bytes);
item->data += bytes;
item->len -= bytes;
return SECSuccess;
}
/*
* Write a number in network byte order. Using this function means the
* SECItem structure cannot be freed. The caller is expected to call
* this function on a shallow copy of the structure.
*/
static SECStatus
ssl3_AppendNumberToItem(SECItem *item, PRUint32 num, PRInt32 lenSize)
{
SECStatus rv;
PRUint8 b[4];
PRUint8 *p = b;
switch (lenSize) {
case 4:
*p++ = (PRUint8)(num >> 24);
case 3:
*p++ = (PRUint8)(num >> 16);
case 2:
*p++ = (PRUint8)(num >> 8);
case 1:
*p = (PRUint8)num;
}
rv = ssl3_AppendToItem(item, &b[0], lenSize);
return rv;
}
/* Format an SNI extension, using the name from the socket's URL,
* unless that name is a dotted decimal string.
* Used by client and server.
*/
PRInt32
ssl3_SendServerNameXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRBool append,
PRUint32 maxBytes)
{
SECStatus rv;
if (!ss)
return 0;
if (!ss->sec.isServer) {
PRUint32 len;
PRNetAddr netAddr;
/* must have a hostname */
if (!ss->url || !ss->url[0])
return 0;
/* must not be an IPv4 or IPv6 address */
if (PR_SUCCESS == PR_StringToNetAddr(ss->url, &netAddr)) {
/* is an IP address (v4 or v6) */
return 0;
}
len = PORT_Strlen(ss->url);
if (append && maxBytes >= len + 9) {
/* extension_type */
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_server_name_xtn, 2);
if (rv != SECSuccess)
return -1;
/* length of extension_data */
rv = ssl3_ExtAppendHandshakeNumber(ss, len + 5, 2);
if (rv != SECSuccess)
return -1;
/* length of server_name_list */
rv = ssl3_ExtAppendHandshakeNumber(ss, len + 3, 2);
if (rv != SECSuccess)
return -1;
/* Name Type (sni_host_name) */
rv = ssl3_ExtAppendHandshake(ss, "\0", 1);
if (rv != SECSuccess)
return -1;
/* HostName (length and value) */
rv = ssl3_ExtAppendHandshakeVariable(ss, (PRUint8 *)ss->url, len, 2);
if (rv != SECSuccess)
return -1;
if (!ss->sec.isServer) {
xtnData->advertised[xtnData->numAdvertised++] =
ssl_server_name_xtn;
}
}
return len + 9;
}
/* Server side */
if (append && maxBytes >= 4) {
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_server_name_xtn, 2);
if (rv != SECSuccess)
return -1;
/* length of extension_data */
rv = ssl3_ExtAppendHandshakeNumber(ss, 0, 2);
if (rv != SECSuccess)
return -1;
}
return 4;
}
/* Handle an incoming SNI extension. */
SECStatus
ssl3_HandleServerNameXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type, SECItem *data)
{
SECItem *names = NULL;
PRUint32 listLenBytes = 0;
SECStatus rv;
if (!ss->sec.isServer) {
return SECSuccess; /* ignore extension */
}
/* Server side - consume client data and register server sender. */
/* do not parse the data if don't have user extension handling function. */
if (!ss->sniSocketConfig) {
return SECSuccess;
}
/* length of server_name_list */
rv = ssl3_ExtConsumeHandshakeNumber(ss, &listLenBytes, 2, &data->data, &data->len);
if (rv != SECSuccess) {
goto loser; /* alert already sent */
}
if (listLenBytes == 0 || listLenBytes != data->len) {
goto alert_loser;
}
/* Read ServerNameList. */
while (data->len > 0) {
SECItem tmp;
PRUint32 type;
/* Read Name Type. */
rv = ssl3_ExtConsumeHandshakeNumber(ss, &type, 1, &data->data, &data->len);
if (rv != SECSuccess) {
/* alert sent in ConsumeHandshakeNumber */
goto loser;
}
/* Read ServerName (length and value). */
rv = ssl3_ExtConsumeHandshakeVariable(ss, &tmp, 2, &data->data, &data->len);
if (rv != SECSuccess) {
goto loser;
}
/* Record the value for host_name(0). */
if (type == sni_nametype_hostname) {
/* Fail if we encounter a second host_name entry. */
if (names) {
goto alert_loser;
}
/* Create an array for the only supported NameType. */
names = PORT_ZNewArray(SECItem, 1);
if (!names) {
goto loser;
}
/* Copy ServerName into the array. */
if (SECITEM_CopyItem(NULL, &names[0], &tmp) != SECSuccess) {
goto loser;
}
}
/* Even if we don't support NameTypes other than host_name at the
* moment, we continue parsing the whole list to check its validity.
* We do not check for duplicate entries with NameType != host_name(0).
*/
}
if (names) {
/* Free old and set the new data. */
ssl3_FreeSniNameArray(xtnData);
xtnData->sniNameArr = names;
xtnData->sniNameArrSize = 1;
xtnData->negotiated[xtnData->numNegotiated++] = ssl_server_name_xtn;
}
return SECSuccess;
alert_loser:
ssl3_ExtDecodeError(ss);
loser:
if (names) {
PORT_Free(names);
}
return SECFailure;
}
/* Frees a given xtnData->sniNameArr and its elements. */
void
ssl3_FreeSniNameArray(TLSExtensionData *xtnData)
{
PRUint32 i;
if (!xtnData->sniNameArr) {
return;
}
for (i = 0; i < xtnData->sniNameArrSize; i++) {
SECITEM_FreeItem(&xtnData->sniNameArr[i], PR_FALSE);
}
PORT_Free(xtnData->sniNameArr);
xtnData->sniNameArr = NULL;
xtnData->sniNameArrSize = 0;
}
/* Called by both clients and servers.
* Clients sends a filled in session ticket if one is available, and otherwise
* sends an empty ticket. Servers always send empty tickets.
*/
PRInt32
ssl3_SendSessionTicketXtn(
const sslSocket *ss,
TLSExtensionData *xtnData,
PRBool append,
PRUint32 maxBytes)
{
PRInt32 extension_length;
NewSessionTicket *session_ticket = NULL;
sslSessionID *sid = ss->sec.ci.sid;
/* Never send an extension with a ticket for TLS 1.3, but
* OK to send the empty one in case the server does 1.2. */
if (sid->cached == in_client_cache &&
sid->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
return 0;
}
/* Ignore the SessionTicket extension if processing is disabled. */
if (!ss->opt.enableSessionTickets)
return 0;
/* Empty extension length = extension_type (2-bytes) +
* length(extension_data) (2-bytes)
*/
extension_length = 4;
/* If we are a client then send a session ticket if one is availble.
* Servers that support the extension and are willing to negotiate the
* the extension always respond with an empty extension.
*/
if (!ss->sec.isServer) {
/* The caller must be holding sid->u.ssl3.lock for reading. We cannot
* just acquire and release the lock within this function because the
* caller will call this function twice, and we need the inputs to be
* consistent between the two calls. Note that currently the caller
* will only be holding the lock when we are the client and when we're
* attempting to resume an existing session.
*/
session_ticket = &sid->u.ssl3.locked.sessionTicket;
if (session_ticket->ticket.data) {
if (xtnData->ticketTimestampVerified) {
extension_length += session_ticket->ticket.len;
} else if (!append && ssl_TicketTimeValid(session_ticket)) {
extension_length += session_ticket->ticket.len;
xtnData->ticketTimestampVerified = PR_TRUE;
}
}
}
if (maxBytes < (PRUint32)extension_length) {
PORT_Assert(0);
return 0;
}
if (append) {
SECStatus rv;
/* extension_type */
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_session_ticket_xtn, 2);
if (rv != SECSuccess)
goto loser;
if (session_ticket && session_ticket->ticket.data &&
xtnData->ticketTimestampVerified) {
rv = ssl3_ExtAppendHandshakeVariable(ss, session_ticket->ticket.data,
session_ticket->ticket.len, 2);
xtnData->ticketTimestampVerified = PR_FALSE;
xtnData->sentSessionTicketInClientHello = PR_TRUE;
} else {
rv = ssl3_ExtAppendHandshakeNumber(ss, 0, 2);
}
if (rv != SECSuccess)
goto loser;
if (!ss->sec.isServer) {
xtnData->advertised[xtnData->numAdvertised++] =
ssl_session_ticket_xtn;
}
}
return extension_length;
loser:
xtnData->ticketTimestampVerified = PR_FALSE;
return -1;
}
static SECStatus
ssl3_ParseEncryptedSessionTicket(sslSocket *ss, SECItem *data,
EncryptedSessionTicket *enc_session_ticket)
{
if (ssl3_ConsumeFromItem(data, &enc_session_ticket->key_name,
SESS_TICKET_KEY_NAME_LEN) !=
SECSuccess)
return SECFailure;
if (ssl3_ConsumeFromItem(data, &enc_session_ticket->iv,
AES_BLOCK_SIZE) !=
SECSuccess)
return SECFailure;
if (ssl3_ConsumeHandshakeVariable(ss, &enc_session_ticket->encrypted_state,
2, &data->data, &data->len) !=
SECSuccess)
return SECFailure;
if (ssl3_ConsumeFromItem(data, &enc_session_ticket->mac,
TLS_EX_SESS_TICKET_MAC_LENGTH) !=
SECSuccess)
return SECFailure;
if (data->len != 0) /* Make sure that we have consumed all bytes. */
return SECFailure;
return SECSuccess;
}
/* handle an incoming Next Protocol Negotiation extension. */
SECStatus
ssl3_ServerHandleNextProtoNegoXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type,
SECItem *data)
{
if (ss->firstHsDone || data->len != 0) {
/* Clients MUST send an empty NPN extension, if any. */
PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID);
return SECFailure;
}
xtnData->negotiated[xtnData->numNegotiated++] = ex_type;
/* TODO: server side NPN support would require calling
* ssl3_RegisterServerHelloExtensionSender here in order to echo the
* extension back to the client. */
return SECSuccess;
}
/* ssl3_ValidateNextProtoNego checks that the given block of data is valid: none
* of the lengths may be 0 and the sum of the lengths must equal the length of
* the block. */
SECStatus
ssl3_ValidateNextProtoNego(const unsigned char *data, unsigned int length)
{
unsigned int offset = 0;
while (offset < length) {
unsigned int newOffset = offset + 1 + (unsigned int)data[offset];
/* Reject embedded nulls to protect against buggy applications that
* store protocol identifiers in null-terminated strings.
*/
if (newOffset > length || data[offset] == 0) {
return SECFailure;
}
offset = newOffset;
}
return SECSuccess;
}
/* protocol selection handler for ALPN (server side) and NPN (client side) */
static SECStatus
ssl3_SelectAppProtocol(const sslSocket *ss, TLSExtensionData *xtnData,
PRUint16 ex_type, SECItem *data)
{
SECStatus rv;
unsigned char resultBuffer[255];
SECItem result = { siBuffer, resultBuffer, 0 };
rv = ssl3_ValidateNextProtoNego(data->data, data->len);
if (rv != SECSuccess) {
ssl3_ExtSendAlert(ss, alert_fatal, decode_error);
PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID);
return rv;
}
PORT_Assert(ss->nextProtoCallback);
/* For ALPN, the cipher suite isn't selected yet. Note that extensions
* sometimes affect what cipher suite is selected, e.g., for ECC. */
PORT_Assert((ss->ssl3.hs.preliminaryInfo &
ssl_preinfo_all & ~ssl_preinfo_cipher_suite) ==
(ssl_preinfo_all & ~ssl_preinfo_cipher_suite));
rv = ss->nextProtoCallback(ss->nextProtoArg, ss->fd, data->data, data->len,
result.data, &result.len, sizeof(resultBuffer));
if (rv != SECSuccess) {
/* Expect callback to call PORT_SetError() */
ssl3_ExtSendAlert(ss, alert_fatal, internal_error);
return SECFailure;
}
/* If the callback wrote more than allowed to |result| it has corrupted our
* stack. */
if (result.len > sizeof(resultBuffer)) {
PORT_SetError(SEC_ERROR_OUTPUT_LEN);
/* TODO: crash */
return SECFailure;
}
SECITEM_FreeItem(&xtnData->nextProto, PR_FALSE);
if (ex_type == ssl_app_layer_protocol_xtn &&
xtnData->nextProtoState != SSL_NEXT_PROTO_NEGOTIATED) {
/* The callback might say OK, but then it picks a default value - one
* that was not listed. That's OK for NPN, but not ALPN. */
ssl3_ExtSendAlert(ss, alert_fatal, no_application_protocol);
PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_NO_PROTOCOL);
return SECFailure;
}
xtnData->negotiated[xtnData->numNegotiated++] = ex_type;
return SECITEM_CopyItem(NULL, &xtnData->nextProto, &result);
}
/* handle an incoming ALPN extension at the server */
SECStatus
ssl3_ServerHandleAppProtoXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type, SECItem *data)
{
PRUint32 count;
SECStatus rv;
/* We expressly don't want to allow ALPN on renegotiation,
* despite it being permitted by the spec. */
if (ss->firstHsDone || data->len == 0) {
/* Clients MUST send a non-empty ALPN extension. */
ssl3_ExtSendAlert(ss, alert_fatal, illegal_parameter);
PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID);
return SECFailure;
}
/* Unlike NPN, ALPN has extra redundant length information so that
* the extension is the same in both ClientHello and ServerHello. */
rv = ssl3_ExtConsumeHandshakeNumber(ss, &count, 2, &data->data, &data->len);
if (rv != SECSuccess || count != data->len) {
ssl3_ExtDecodeError(ss);
return SECFailure;
}
if (!ss->nextProtoCallback) {
/* we're not configured for it */
return SECSuccess;
}
rv = ssl3_SelectAppProtocol(ss, xtnData, ex_type, data);
if (rv != SECSuccess) {
return rv;
}
/* prepare to send back a response, if we negotiated */
if (xtnData->nextProtoState == SSL_NEXT_PROTO_NEGOTIATED) {
rv = ssl3_RegisterExtensionSender(
ss, xtnData, ex_type, ssl3_ServerSendAppProtoXtn);
if (rv != SECSuccess) {
ssl3_ExtSendAlert(ss, alert_fatal, internal_error);
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
return rv;
}
}
return SECSuccess;
}
SECStatus
ssl3_ClientHandleNextProtoNegoXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type,
SECItem *data)
{
PORT_Assert(!ss->firstHsDone);
if (ssl3_ExtensionNegotiated(ss, ssl_app_layer_protocol_xtn)) {
/* If the server negotiated ALPN then it has already told us what
* protocol to use, so it doesn't make sense for us to try to negotiate
* a different one by sending the NPN handshake message. However, if
* we've negotiated NPN then we're required to send the NPN handshake
* message. Thus, these two extensions cannot both be negotiated on the
* same connection. */
ssl3_ExtSendAlert(ss, alert_fatal, illegal_parameter);
PORT_SetError(SSL_ERROR_BAD_SERVER);
return SECFailure;
}
/* We should only get this call if we sent the extension, so
* ss->nextProtoCallback needs to be non-NULL. However, it is possible
* that an application erroneously cleared the callback between the time
* we sent the ClientHello and now. */
if (!ss->nextProtoCallback) {
PORT_Assert(0);
ssl3_ExtSendAlert(ss, alert_fatal, internal_error);
PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_NO_CALLBACK);
return SECFailure;
}
return ssl3_SelectAppProtocol(ss, xtnData, ex_type, data);
}
SECStatus
ssl3_ClientHandleAppProtoXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type, SECItem *data)
{
SECStatus rv;
PRUint32 list_len;
SECItem protocol_name;
if (ssl3_ExtensionNegotiated(ss, ssl_next_proto_nego_xtn)) {
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
return SECFailure;
}
/* The extension data from the server has the following format:
* uint16 name_list_len;
* uint8 len; // where len >= 1
* uint8 protocol_name[len]; */
if (data->len < 4 || data->len > 2 + 1 + 255) {
ssl3_ExtSendAlert(ss, alert_fatal, decode_error);
PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID);
return SECFailure;
}
rv = ssl3_ExtConsumeHandshakeNumber(ss, &list_len, 2, &data->data,
&data->len);
/* The list has to be the entire extension. */
if (rv != SECSuccess || list_len != data->len) {
ssl3_ExtSendAlert(ss, alert_fatal, decode_error);
PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID);
return SECFailure;
}
rv = ssl3_ExtConsumeHandshakeVariable(ss, &protocol_name, 1,
&data->data, &data->len);
/* The list must have exactly one value. */
if (rv != SECSuccess || data->len != 0) {
ssl3_ExtSendAlert(ss, alert_fatal, decode_error);
PORT_SetError(SSL_ERROR_NEXT_PROTOCOL_DATA_INVALID);
return SECFailure;
}
SECITEM_FreeItem(&xtnData->nextProto, PR_FALSE);
xtnData->nextProtoState = SSL_NEXT_PROTO_SELECTED;
xtnData->negotiated[xtnData->numNegotiated++] = ex_type;
return SECITEM_CopyItem(NULL, &xtnData->nextProto, &protocol_name);
}
PRInt32
ssl3_ClientSendNextProtoNegoXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRBool append,
PRUint32 maxBytes)
{
PRInt32 extension_length;
/* Renegotiations do not send this extension. */
if (!ss->opt.enableNPN || !ss->nextProtoCallback || ss->firstHsDone) {
return 0;
}
extension_length = 4;
if (maxBytes < (PRUint32)extension_length) {
return 0;
}
if (append) {
SECStatus rv;
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_next_proto_nego_xtn, 2);
if (rv != SECSuccess)
goto loser;
rv = ssl3_ExtAppendHandshakeNumber(ss, 0, 2);
if (rv != SECSuccess)
goto loser;
xtnData->advertised[xtnData->numAdvertised++] =
ssl_next_proto_nego_xtn;
}
return extension_length;
loser:
return -1;
}
PRInt32
ssl3_ClientSendAppProtoXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRBool append, PRUint32 maxBytes)
{
PRInt32 extension_length;
unsigned char *alpn_protos = NULL;
/* Renegotiations do not send this extension. */
if (!ss->opt.enableALPN || !ss->opt.nextProtoNego.data || ss->firstHsDone) {
return 0;
}
extension_length = 2 /* extension type */ + 2 /* extension length */ +
2 /* protocol name list length */ +
ss->opt.nextProtoNego.len;
if (maxBytes < (PRUint32)extension_length) {
return 0;
}
if (append) {
/* NPN requires that the client's fallback protocol is first in the
* list. However, ALPN sends protocols in preference order. So we
* allocate a buffer and move the first protocol to the end of the
* list. */
SECStatus rv;
const unsigned int len = ss->opt.nextProtoNego.len;
alpn_protos = PORT_Alloc(len);
if (alpn_protos == NULL) {
return SECFailure;
}
if (len > 0) {
/* Each protocol string is prefixed with a single byte length. */
unsigned int i = ss->opt.nextProtoNego.data[0] + 1;
if (i <= len) {
memcpy(alpn_protos, &ss->opt.nextProtoNego.data[i], len - i);
memcpy(alpn_protos + len - i, ss->opt.nextProtoNego.data, i);
} else {
/* This seems to be invalid data so we'll send as-is. */
memcpy(alpn_protos, ss->opt.nextProtoNego.data, len);
}
}
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_app_layer_protocol_xtn, 2);
if (rv != SECSuccess) {
goto loser;
}
rv = ssl3_ExtAppendHandshakeNumber(ss, extension_length - 4, 2);
if (rv != SECSuccess) {
goto loser;
}
rv = ssl3_ExtAppendHandshakeVariable(ss, alpn_protos, len, 2);
PORT_Free(alpn_protos);
alpn_protos = NULL;
if (rv != SECSuccess) {
goto loser;
}
xtnData->advertised[xtnData->numAdvertised++] =
ssl_app_layer_protocol_xtn;
}
return extension_length;
loser:
if (alpn_protos) {
PORT_Free(alpn_protos);
}
return -1;
}
PRInt32
ssl3_ServerSendAppProtoXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRBool append, PRUint32 maxBytes)
{
PRInt32 extension_length;
/* we're in over our heads if any of these fail */
PORT_Assert(ss->opt.enableALPN);
PORT_Assert(xtnData->nextProto.data);
PORT_Assert(xtnData->nextProto.len > 0);
PORT_Assert(xtnData->nextProtoState == SSL_NEXT_PROTO_NEGOTIATED);
PORT_Assert(!ss->firstHsDone);
extension_length = 2 /* extension type */ + 2 /* extension length */ +
2 /* protocol name list */ + 1 /* name length */ +
xtnData->nextProto.len;
if (maxBytes < (PRUint32)extension_length) {
return 0;
}
if (append) {
SECStatus rv;
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_app_layer_protocol_xtn, 2);
if (rv != SECSuccess) {
return -1;
}
rv = ssl3_ExtAppendHandshakeNumber(ss, extension_length - 4, 2);
if (rv != SECSuccess) {
return -1;
}
rv = ssl3_ExtAppendHandshakeNumber(ss, xtnData->nextProto.len + 1, 2);
if (rv != SECSuccess) {
return -1;
}
rv = ssl3_ExtAppendHandshakeVariable(ss, xtnData->nextProto.data,
xtnData->nextProto.len, 1);
if (rv != SECSuccess) {
return -1;
}
}
return extension_length;
}
SECStatus
ssl3_ServerHandleStatusRequestXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type,
SECItem *data)
{
ssl3HelloExtensionSenderFunc sender;
PORT_Assert(ss->sec.isServer);
/* remember that we got this extension. */
xtnData->negotiated[xtnData->numNegotiated++] = ex_type;
if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
sender = tls13_ServerSendStatusRequestXtn;
} else {
sender = ssl3_ServerSendStatusRequestXtn;
}
return ssl3_RegisterExtensionSender(ss, xtnData, ex_type, sender);
}
PRInt32
ssl3_ServerSendStatusRequestXtn(
const sslSocket *ss,
TLSExtensionData *xtnData,
PRBool append,
PRUint32 maxBytes)
{
PRInt32 extension_length;
const sslServerCert *serverCert = ss->sec.serverCert;
SECStatus rv;
if (!serverCert->certStatusArray ||
!serverCert->certStatusArray->len) {
return 0;
}
extension_length = 2 + 2;
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, 0, 2);
if (rv != SECSuccess)
return -1;
/* The certificate status data is sent in ssl3_SendCertificateStatus. */
}
return extension_length;
}
/* ssl3_ClientSendStatusRequestXtn builds the status_request extension on the
* client side. See RFC 6066 section 8. */
PRInt32
ssl3_ClientSendStatusRequestXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRBool append,
PRUint32 maxBytes)
{
PRInt32 extension_length;
if (!ss->opt.enableOCSPStapling)
return 0;
/* extension_type (2-bytes) +
* length(extension_data) (2-bytes) +
* status_type (1) +
* responder_id_list length (2) +
* request_extensions length (2)
*/
extension_length = 9;
if (maxBytes < (PRUint32)extension_length) {
PORT_Assert(0);
return 0;
}
if (append) {
SECStatus rv;
/* extension_type */
rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_cert_status_xtn, 2);
if (rv != SECSuccess)
return -1;
rv = ssl3_ExtAppendHandshakeNumber(ss, extension_length - 4, 2);
if (rv != SECSuccess)
return -1;
rv = ssl3_ExtAppendHandshakeNumber(ss, 1 /* status_type ocsp */, 1);
if (rv != SECSuccess)
return -1;
/* A zero length responder_id_list means that the responders are
* implicitly known to the server. */
rv = ssl3_ExtAppendHandshakeNumber(ss, 0, 2);
if (rv != SECSuccess)
return -1;
/* A zero length request_extensions means that there are no extensions.
* Specifically, we don't set the id-pkix-ocsp-nonce extension. This
* means that the server can replay a cached OCSP response to us. */
rv = ssl3_ExtAppendHandshakeNumber(ss, 0, 2);
if (rv != SECSuccess)
return -1;
xtnData->advertised[xtnData->numAdvertised++] = ssl_cert_status_xtn;
}
return extension_length;
}
SECStatus
ssl3_ClientHandleStatusRequestXtn(const sslSocket *ss, TLSExtensionData *xtnData, PRUint16 ex_type,
SECItem *data)
{
/* In TLS 1.3, the extension carries the OCSP response. */
if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
SECStatus rv;
rv = ssl_ReadCertificateStatus(CONST_CAST(sslSocket, ss),
data->data, data->len);
if (rv != SECSuccess) {
return SECFailure; /* code already set */
}
} else if (data->len != 0) {
ssl3_ExtSendAlert(ss, alert_fatal, illegal_parameter);
PORT_SetError(SSL_ERROR_RX_MALFORMED_SERVER_HELLO);
return SECFailure;
}
/* Keep track of negotiated extensions. */
xtnData->negotiated[xtnData->numNegotiated++] = ex_type;
return SECSuccess;
}
/*
* Called from ssl3_SendNewSessionTicket, tls13_SendNewSessionTicket
*/
SECStatus
ssl3_EncodeSessionTicket(sslSocket *ss,
const NewSessionTicket *ticket,
SECItem *ticket_data)
{
PRUint32 i;
SECStatus rv;
SECItem plaintext;
SECItem plaintext_item = { 0, NULL, 0 };
SECItem ciphertext = { 0, NULL, 0 };
PRUint32 ciphertext_length;
SECItem ticket_buf = { 0, NULL, 0 };
SECItem ticket_tmp = { 0, NULL, 0 };
SECItem macParam = { 0, NULL, 0 };
PRBool ms_is_wrapped;
unsigned char wrapped_ms[SSL3_MASTER_SECRET_LENGTH];
SECItem ms_item = { 0, NULL, 0 };
PRUint32 padding_length;
PRUint32 ticket_length;
PRUint32 cert_length = 0;
PRUint8 length_buf[4];
PRUint32 now;
unsigned char key_name[SESS_TICKET_KEY_NAME_LEN];
PK11SymKey *aes_key = NULL;
PK11SymKey *mac_key = NULL;
CK_MECHANISM_TYPE cipherMech = CKM_AES_CBC;
PK11Context *aes_ctx;
CK_MECHANISM_TYPE macMech = CKM_SHA256_HMAC;
PK11Context *hmac_ctx = NULL;
unsigned char computed_mac[TLS_EX_SESS_TICKET_MAC_LENGTH];
unsigned int computed_mac_length;
unsigned char iv[AES_BLOCK_SIZE];
SECItem ivItem;
SECItem *srvName = NULL;
PRUint32 srvNameLen = 0;
CK_MECHANISM_TYPE msWrapMech = 0; /* dummy default value,
* must be >= 0 */
ssl3CipherSpec *spec;
SECItem alpnSelection = { siBuffer, NULL, 0 };
SSL_TRC(3, ("%d: SSL3[%d]: send session_ticket handshake",
SSL_GETPID(), ss->fd));
PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
if (ss->opt.requestCertificate && ss->sec.ci.sid->peerCert) {
cert_length = 3 + ss->sec.ci.sid->peerCert->derCert.len;
}
/* Get IV and encryption keys */
ivItem.data = iv;
ivItem.len = sizeof(iv);
rv = PK11_GenerateRandom(iv, sizeof(iv));
if (rv != SECSuccess)
goto loser;
rv = ssl_GetSessionTicketKeys(ss, key_name, &aes_key, &mac_key);
if (rv != SECSuccess)
goto loser;
if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
spec = ss->ssl3.cwSpec;
} else {
spec = ss->ssl3.pwSpec;
}
if (spec->msItem.len && spec->msItem.data) {
/* The master secret is available unwrapped. */
ms_item.data = spec->msItem.data;
ms_item.len = spec->msItem.len;
ms_is_wrapped = PR_FALSE;
} else {
/* Extract the master secret wrapped. */
sslSessionID sid;
PORT_Memset(&sid, 0, sizeof(sslSessionID));
rv = ssl3_CacheWrappedMasterSecret(ss, &sid, spec);
if (rv == SECSuccess) {
if (sid.u.ssl3.keys.wrapped_master_secret_len > sizeof(wrapped_ms))
goto loser;
memcpy(wrapped_ms, sid.u.ssl3.keys.wrapped_master_secret,
sid.u.ssl3.keys.wrapped_master_secret_len);
ms_item.data = wrapped_ms;
ms_item.len = sid.u.ssl3.keys.wrapped_master_secret_len;
msWrapMech = sid.u.ssl3.masterWrapMech;
} else {
/* TODO: else send an empty ticket. */
goto loser;
}
ms_is_wrapped = PR_TRUE;
}
/* Prep to send negotiated name */
srvName = &ss->sec.ci.sid->u.ssl3.srvName;
if (srvName->data && srvName->len) {
srvNameLen = 2 + srvName->len; /* len bytes + name len */
}
if (ss->xtnData.nextProtoState != SSL_NEXT_PROTO_NO_SUPPORT &&
ss->xtnData.nextProto.data) {
alpnSelection = ss->xtnData.nextProto;
}
ciphertext_length =
sizeof(PRUint16) /* ticket_version */
+ sizeof(SSL3ProtocolVersion) /* ssl_version */
+ sizeof(ssl3CipherSuite) /* ciphersuite */
+ 1 /* compression */
+ 10 /* cipher spec parameters */
+ 1 /* certType arguments */
+ 1 /* SessionTicket.ms_is_wrapped */
+ 4 /* msWrapMech */
+ 2 /* master_secret.length */
+ ms_item.len /* master_secret */
+ 1 /* client_auth_type */
+ cert_length /* cert */
+ 1 /* server name type */
+ srvNameLen /* name len + length field */
+ 1 /* extendedMasterSecretUsed */
+ sizeof(ticket->ticket_lifetime_hint) /* ticket lifetime hint */
+ sizeof(ticket->flags) /* ticket flags */
+ 1 + alpnSelection.len; /* npn value + length field. */
padding_length = AES_BLOCK_SIZE -
(ciphertext_length %
AES_BLOCK_SIZE);
ciphertext_length += padding_length;
if (SECITEM_AllocItem(NULL, &plaintext_item, ciphertext_length) == NULL)
goto loser;
plaintext = plaintext_item;
/* ticket_version */
rv = ssl3_AppendNumberToItem(&plaintext, TLS_EX_SESS_TICKET_VERSION,
sizeof(PRUint16));
if (rv != SECSuccess)
goto loser;
/* ssl_version */
rv = ssl3_AppendNumberToItem(&plaintext, ss->version,
sizeof(SSL3ProtocolVersion));
if (rv != SECSuccess)
goto loser;
/* ciphersuite */
rv = ssl3_AppendNumberToItem(&plaintext, ss->ssl3.hs.cipher_suite,