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

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* Various SSL functions.
*
* 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 "cert.h"
#include "secitem.h"
#include "keyhi.h"
#include "ssl.h"
#include "sslimpl.h"
#include "sslproto.h"
#include "secoid.h" /* for SECOID_GetALgorithmTag */
#include "pk11func.h" /* for PK11_GenerateRandom */
#include "nss.h" /* for NSS_RegisterShutdown */
#include "prinit.h" /* for PR_CallOnceWithArg */
/* Returns a SECStatus: SECSuccess or SECFailure, NOT SECWouldBlock.
*
* Currently, the list of functions called through ss->handshake is:
*
* In sslsocks.c:
* SocksGatherRecord
* SocksHandleReply
* SocksStartGather
*
* In sslcon.c:
* ssl_GatherRecord1stHandshake
* ssl_BeginClientHandshake
* ssl_BeginServerHandshake
*
* The ss->handshake function returns SECWouldBlock if it was returned by
* one of the callback functions, via one of these paths:
*
* - ssl_GatherRecord1stHandshake() -> ssl3_GatherCompleteHandshake() ->
* ssl3_HandleRecord() -> ssl3_HandleHandshake() ->
* ssl3_HandleHandshakeMessage() -> ssl3_HandleCertificate() ->
* ss->handleBadCert()
*
* - ssl_GatherRecord1stHandshake() -> ssl3_GatherCompleteHandshake() ->
* ssl3_HandleRecord() -> ssl3_HandleHandshake() ->
* ssl3_HandleHandshakeMessage() -> ssl3_HandleCertificateRequest() ->
* ss->getClientAuthData()
*
* Called from: SSL_ForceHandshake (below),
* ssl_SecureRecv (below) and
* ssl_SecureSend (below)
* from: WaitForResponse in sslsocks.c
* ssl_SocksRecv in sslsocks.c
* ssl_SocksSend in sslsocks.c
*
* Caller must hold the (write) handshakeLock.
*/
int
ssl_Do1stHandshake(sslSocket *ss)
{
int rv = SECSuccess;
while (ss->handshake && rv == SECSuccess) {
PORT_Assert(ss->opt.noLocks || ssl_Have1stHandshakeLock(ss));
PORT_Assert(ss->opt.noLocks || !ssl_HaveRecvBufLock(ss));
PORT_Assert(ss->opt.noLocks || !ssl_HaveXmitBufLock(ss));
PORT_Assert(ss->opt.noLocks || !ssl_HaveSSL3HandshakeLock(ss));
rv = (*ss->handshake)(ss);
};
PORT_Assert(ss->opt.noLocks || !ssl_HaveRecvBufLock(ss));
PORT_Assert(ss->opt.noLocks || !ssl_HaveXmitBufLock(ss));
PORT_Assert(ss->opt.noLocks || !ssl_HaveSSL3HandshakeLock(ss));
if (rv == SECWouldBlock) {
PORT_SetError(PR_WOULD_BLOCK_ERROR);
rv = SECFailure;
}
return rv;
}
void
ssl_FinishHandshake(sslSocket *ss)
{
PORT_Assert(ss->opt.noLocks || ssl_Have1stHandshakeLock(ss));
PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
SSL_TRC(3, ("%d: SSL[%d]: handshake is completed", SSL_GETPID(), ss->fd));
ss->firstHsDone = PR_TRUE;
ss->enoughFirstHsDone = PR_TRUE;
ss->gs.writeOffset = 0;
ss->gs.readOffset = 0;
if (ss->handshakeCallback) {
PORT_Assert((ss->ssl3.hs.preliminaryInfo & ssl_preinfo_all) ==
ssl_preinfo_all);
(ss->handshakeCallback)(ss->fd, ss->handshakeCallbackData);
}
ssl_FreeEphemeralKeyPairs(ss);
}
/*
* Handshake function that blocks. Used to force a
* retry on a connection on the next read/write.
*/
static SECStatus
ssl3_AlwaysBlock(sslSocket *ss)
{
PORT_SetError(PR_WOULD_BLOCK_ERROR); /* perhaps redundant. */
return SECWouldBlock;
}
/*
* set the initial handshake state machine to block
*/
void
ssl3_SetAlwaysBlock(sslSocket *ss)
{
if (!ss->firstHsDone) {
ss->handshake = ssl3_AlwaysBlock;
}
}
static SECStatus
ssl_SetTimeout(PRFileDesc *fd, PRIntervalTime timeout)
{
sslSocket *ss;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in SetTimeout", SSL_GETPID(), fd));
return SECFailure;
}
SSL_LOCK_READER(ss);
ss->rTimeout = timeout;
if (ss->opt.fdx) {
SSL_LOCK_WRITER(ss);
}
ss->wTimeout = timeout;
if (ss->opt.fdx) {
SSL_UNLOCK_WRITER(ss);
}
SSL_UNLOCK_READER(ss);
return SECSuccess;
}
/* Acquires and releases HandshakeLock.
*/
SECStatus
SSL_ResetHandshake(PRFileDesc *s, PRBool asServer)
{
sslSocket *ss;
SECStatus status;
PRNetAddr addr;
ss = ssl_FindSocket(s);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in ResetHandshake", SSL_GETPID(), s));
return SECFailure;
}
/* Don't waste my time */
if (!ss->opt.useSecurity)
return SECSuccess;
SSL_LOCK_READER(ss);
SSL_LOCK_WRITER(ss);
/* Reset handshake state */
ssl_Get1stHandshakeLock(ss);
ss->firstHsDone = PR_FALSE;
ss->enoughFirstHsDone = PR_FALSE;
if (asServer) {
ss->handshake = ssl_BeginServerHandshake;
ss->handshaking = sslHandshakingAsServer;
} else {
ss->handshake = ssl_BeginClientHandshake;
ss->handshaking = sslHandshakingAsClient;
}
ssl_GetRecvBufLock(ss);
status = ssl3_InitGather(&ss->gs);
ssl_ReleaseRecvBufLock(ss);
if (status != SECSuccess)
goto loser;
ssl_GetSSL3HandshakeLock(ss);
ss->ssl3.hs.canFalseStart = PR_FALSE;
ss->ssl3.hs.restartTarget = NULL;
/*
** Blow away old security state and get a fresh setup.
*/
ssl_GetXmitBufLock(ss);
ssl_ResetSecurityInfo(&ss->sec, PR_TRUE);
status = ssl_CreateSecurityInfo(ss);
ssl_ReleaseXmitBufLock(ss);
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_Release1stHandshakeLock(ss);
ssl3_DestroyRemoteExtensions(&ss->ssl3.hs.remoteExtensions);
ssl3_ResetExtensionData(&ss->xtnData, ss);
if (!ss->TCPconnected)
ss->TCPconnected = (PR_SUCCESS == ssl_DefGetpeername(ss, &addr));
loser:
SSL_UNLOCK_WRITER(ss);
SSL_UNLOCK_READER(ss);
return status;
}
/* For SSLv2, does nothing but return an error.
** For SSLv3, flushes SID cache entry (if requested),
** and then starts new client hello or hello request.
** Acquires and releases HandshakeLock.
*/
SECStatus
SSL_ReHandshake(PRFileDesc *fd, PRBool flushCache)
{
sslSocket *ss;
SECStatus rv;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in RedoHandshake", SSL_GETPID(), fd));
return SECFailure;
}
if (!ss->opt.useSecurity)
return SECSuccess;
ssl_Get1stHandshakeLock(ss);
ssl_GetSSL3HandshakeLock(ss);
rv = ssl3_RedoHandshake(ss, flushCache); /* force full handshake. */
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_Release1stHandshakeLock(ss);
return rv;
}
/*
** Same as above, but with an I/O timeout.
*/
SSL_IMPORT SECStatus
SSL_ReHandshakeWithTimeout(PRFileDesc *fd,
PRBool flushCache,
PRIntervalTime timeout)
{
if (SECSuccess != ssl_SetTimeout(fd, timeout)) {
return SECFailure;
}
return SSL_ReHandshake(fd, flushCache);
}
SECStatus
SSL_RedoHandshake(PRFileDesc *fd)
{
return SSL_ReHandshake(fd, PR_TRUE);
}
/* Register an application callback to be called when SSL handshake completes.
** Acquires and releases HandshakeLock.
*/
SECStatus
SSL_HandshakeCallback(PRFileDesc *fd, SSLHandshakeCallback cb,
void *client_data)
{
sslSocket *ss;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in HandshakeCallback",
SSL_GETPID(), fd));
return SECFailure;
}
if (!ss->opt.useSecurity) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
ssl_Get1stHandshakeLock(ss);
ssl_GetSSL3HandshakeLock(ss);
ss->handshakeCallback = cb;
ss->handshakeCallbackData = client_data;
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_Release1stHandshakeLock(ss);
return SECSuccess;
}
/* Register an application callback to be called when false start may happen.
** Acquires and releases HandshakeLock.
*/
SECStatus
SSL_SetCanFalseStartCallback(PRFileDesc *fd, SSLCanFalseStartCallback cb,
void *arg)
{
sslSocket *ss;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in SSL_SetCanFalseStartCallback",
SSL_GETPID(), fd));
return SECFailure;
}
if (!ss->opt.useSecurity) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
ssl_Get1stHandshakeLock(ss);
ssl_GetSSL3HandshakeLock(ss);
ss->canFalseStartCallback = cb;
ss->canFalseStartCallbackData = arg;
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_Release1stHandshakeLock(ss);
return SECSuccess;
}
SECStatus
SSL_RecommendedCanFalseStart(PRFileDesc *fd, PRBool *canFalseStart)
{
sslSocket *ss;
*canFalseStart = PR_FALSE;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in SSL_RecommendedCanFalseStart",
SSL_GETPID(), fd));
return SECFailure;
}
/* Require a forward-secret key exchange. */
*canFalseStart = ss->ssl3.hs.kea_def->kea == kea_dhe_dss ||
ss->ssl3.hs.kea_def->kea == kea_dhe_rsa ||
ss->ssl3.hs.kea_def->kea == kea_ecdhe_ecdsa ||
ss->ssl3.hs.kea_def->kea == kea_ecdhe_rsa;
return SECSuccess;
}
/* Try to make progress on an SSL handshake by attempting to read the
** next handshake from the peer, and sending any responses.
** For non-blocking sockets, returns PR_ERROR_WOULD_BLOCK if it cannot
** read the next handshake from the underlying socket.
** Returns when handshake is complete, or application data has
** arrived that must be taken by application before handshake can continue,
** or a fatal error occurs.
** Application should use handshake completion callback to tell which.
*/
SECStatus
SSL_ForceHandshake(PRFileDesc *fd)
{
sslSocket *ss;
SECStatus rv = SECFailure;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in ForceHandshake",
SSL_GETPID(), fd));
return rv;
}
/* Don't waste my time */
if (!ss->opt.useSecurity)
return SECSuccess;
if (!ssl_SocketIsBlocking(ss)) {
ssl_GetXmitBufLock(ss);
if (ss->pendingBuf.len != 0) {
int sent = ssl_SendSavedWriteData(ss);
if ((sent < 0) && (PORT_GetError() != PR_WOULD_BLOCK_ERROR)) {
ssl_ReleaseXmitBufLock(ss);
return SECFailure;
}
}
ssl_ReleaseXmitBufLock(ss);
}
ssl_Get1stHandshakeLock(ss);
if (ss->version >= SSL_LIBRARY_VERSION_3_0) {
int gatherResult;
ssl_GetRecvBufLock(ss);
gatherResult = ssl3_GatherCompleteHandshake(ss, 0);
ssl_ReleaseRecvBufLock(ss);
if (gatherResult > 0) {
rv = SECSuccess;
} else if (gatherResult == 0) {
PORT_SetError(PR_END_OF_FILE_ERROR);
} else if (gatherResult == SECWouldBlock) {
PORT_SetError(PR_WOULD_BLOCK_ERROR);
}
} else {
PORT_Assert(!ss->firstHsDone);
rv = ssl_Do1stHandshake(ss);
}
ssl_Release1stHandshakeLock(ss);
return rv;
}
/*
** Same as above, but with an I/O timeout.
*/
SSL_IMPORT SECStatus
SSL_ForceHandshakeWithTimeout(PRFileDesc *fd,
PRIntervalTime timeout)
{
if (SECSuccess != ssl_SetTimeout(fd, timeout)) {
return SECFailure;
}
return SSL_ForceHandshake(fd);
}
/************************************************************************/
/*
** Save away write data that is trying to be written before the security
** handshake has been completed. When the handshake is completed, we will
** flush this data out.
** Caller must hold xmitBufLock
*/
SECStatus
ssl_SaveWriteData(sslSocket *ss, const void *data, unsigned int len)
{
SECStatus rv;
PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
rv = sslBuffer_Append(&ss->pendingBuf, data, len);
SSL_TRC(5, ("%d: SSL[%d]: saving %u bytes of data (%u total saved so far)",
SSL_GETPID(), ss->fd, len, ss->pendingBuf.len));
return rv;
}
/*
** Send saved write data. This will flush out data sent prior to a
** complete security handshake. Hopefully there won't be too much of it.
** Returns count of the bytes sent, NOT a SECStatus.
** Caller must hold xmitBufLock
*/
int
ssl_SendSavedWriteData(sslSocket *ss)
{
int rv = 0;
PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
if (ss->pendingBuf.len != 0) {
SSL_TRC(5, ("%d: SSL[%d]: sending %d bytes of saved data",
SSL_GETPID(), ss->fd, ss->pendingBuf.len));
rv = ssl_DefSend(ss, ss->pendingBuf.buf, ss->pendingBuf.len, 0);
if (rv < 0) {
return rv;
}
ss->pendingBuf.len -= rv;
if (ss->pendingBuf.len > 0 && rv > 0) {
/* UGH !! This shifts the whole buffer down by copying it */
PORT_Memmove(ss->pendingBuf.buf, ss->pendingBuf.buf + rv,
ss->pendingBuf.len);
}
}
return rv;
}
/************************************************************************/
/*
** Receive some application data on a socket. Reads SSL records from the input
** stream, decrypts them and then copies them to the output buffer.
** Called from ssl_SecureRecv() below.
**
** Caller does NOT hold 1stHandshakeLock because that handshake is over.
** Caller doesn't call this until initial handshake is complete.
** The call to ssl3_GatherAppDataRecord may encounter handshake
** messages from a subsequent handshake.
**
** This code is similar to, and easily confused with,
** ssl_GatherRecord1stHandshake() in sslcon.c
*/
static int
DoRecv(sslSocket *ss, unsigned char *out, int len, int flags)
{
int rv;
int amount;
int available;
/* ssl3_GatherAppDataRecord may call ssl_FinishHandshake, which needs the
* 1stHandshakeLock. */
ssl_Get1stHandshakeLock(ss);
ssl_GetRecvBufLock(ss);
available = ss->gs.writeOffset - ss->gs.readOffset;
if (available == 0) {
/* Wait for application data to arrive. */
rv = ssl3_GatherAppDataRecord(ss, 0);
if (rv <= 0) {
if (rv == 0) {
/* EOF */
SSL_TRC(10, ("%d: SSL[%d]: ssl_recv EOF",
SSL_GETPID(), ss->fd));
goto done;
}
if ((rv != SECWouldBlock) &&
(PR_GetError() != PR_WOULD_BLOCK_ERROR)) {
/* Some random error */
goto done;
}
/*
** Gather record is blocked waiting for more record data to
** arrive. Try to process what we have already received
*/
} else {
/* Gather record has finished getting a complete record */
}
/* See if any clear data is now available */
available = ss->gs.writeOffset - ss->gs.readOffset;
if (available == 0) {
/*
** No partial data is available. Force error code to
** EWOULDBLOCK so that caller will try again later. Note
** that the error code is probably EWOULDBLOCK already,
** but if it isn't (for example, if we received a zero
** length record) then this will force it to be correct.
*/
PORT_SetError(PR_WOULD_BLOCK_ERROR);
rv = SECFailure;
goto done;
}
SSL_TRC(30, ("%d: SSL[%d]: partial data ready, available=%d",
SSL_GETPID(), ss->fd, available));
}
if (IS_DTLS(ss) && (len < available)) {
/* DTLS does not allow you to do partial reads */
SSL_TRC(30, ("%d: SSL[%d]: DTLS short read. len=%d available=%d",
SSL_GETPID(), ss->fd, len, available));
ss->gs.readOffset += available;
PORT_SetError(SSL_ERROR_RX_SHORT_DTLS_READ);
rv = SECFailure;
goto done;
}
/* Dole out clear data to reader */
amount = PR_MIN(len, available);
PORT_Memcpy(out, ss->gs.buf.buf + ss->gs.readOffset, amount);
if (!(flags & PR_MSG_PEEK)) {
ss->gs.readOffset += amount;
}
PORT_Assert(ss->gs.readOffset <= ss->gs.writeOffset);
rv = amount;
SSL_TRC(30, ("%d: SSL[%d]: amount=%d available=%d",
SSL_GETPID(), ss->fd, amount, available));
PRINT_BUF(4, (ss, "DoRecv receiving plaintext:", out, amount));
done:
ssl_ReleaseRecvBufLock(ss);
ssl_Release1stHandshakeLock(ss);
return rv;
}
/************************************************************************/
SECStatus
ssl_CreateSecurityInfo(sslSocket *ss)
{
SECStatus status;
ssl_GetXmitBufLock(ss);
status = sslBuffer_Grow(&ss->sec.writeBuf, 4096);
ssl_ReleaseXmitBufLock(ss);
return status;
}
SECStatus
ssl_CopySecurityInfo(sslSocket *ss, sslSocket *os)
{
ss->sec.isServer = os->sec.isServer;
ss->sec.peerCert = CERT_DupCertificate(os->sec.peerCert);
if (os->sec.peerCert && !ss->sec.peerCert)
goto loser;
return SECSuccess;
loser:
return SECFailure;
}
/* Reset sec back to its initial state.
** Caller holds any relevant locks.
*/
void
ssl_ResetSecurityInfo(sslSecurityInfo *sec, PRBool doMemset)
{
if (sec->localCert) {
CERT_DestroyCertificate(sec->localCert);
sec->localCert = NULL;
}
if (sec->peerCert) {
CERT_DestroyCertificate(sec->peerCert);
sec->peerCert = NULL;
}
if (sec->peerKey) {
SECKEY_DestroyPublicKey(sec->peerKey);
sec->peerKey = NULL;
}
/* cleanup the ci */
if (sec->ci.sid != NULL) {
ssl_FreeSID(sec->ci.sid);
}
PORT_ZFree(sec->ci.sendBuf.buf, sec->ci.sendBuf.space);
if (doMemset) {
memset(&sec->ci, 0, sizeof sec->ci);
}
}
/*
** Called from SSL_ResetHandshake (above), and
** from ssl_FreeSocket in sslsock.c
** Caller should hold relevant locks (e.g. XmitBufLock)
*/
void
ssl_DestroySecurityInfo(sslSecurityInfo *sec)
{
ssl_ResetSecurityInfo(sec, PR_FALSE);
PORT_ZFree(sec->writeBuf.buf, sec->writeBuf.space);
sec->writeBuf.buf = 0;
memset(sec, 0, sizeof *sec);
}
/************************************************************************/
int
ssl_SecureConnect(sslSocket *ss, const PRNetAddr *sa)
{
PRFileDesc *osfd = ss->fd->lower;
int rv;
if (ss->opt.handshakeAsServer) {
ss->handshake = ssl_BeginServerHandshake;
ss->handshaking = sslHandshakingAsServer;
} else {
ss->handshake = ssl_BeginClientHandshake;
ss->handshaking = sslHandshakingAsClient;
}
/* connect to server */
rv = osfd->methods->connect(osfd, sa, ss->cTimeout);
if (rv == PR_SUCCESS) {
ss->TCPconnected = 1;
} else {
int err = PR_GetError();
SSL_DBG(("%d: SSL[%d]: connect failed, errno=%d",
SSL_GETPID(), ss->fd, err));
if (err == PR_IS_CONNECTED_ERROR) {
ss->TCPconnected = 1;
}
}
SSL_TRC(5, ("%d: SSL[%d]: secure connect completed, rv == %d",
SSL_GETPID(), ss->fd, rv));
return rv;
}
/*
* The TLS 1.2 RFC 5246, Section 7.2.1 says:
*
* Unless some other fatal alert has been transmitted, each party is
* required to send a close_notify alert before closing the write side
* of the connection. The other party MUST respond with a close_notify
* alert of its own and close down the connection immediately,
* discarding any pending writes. It is not required for the initiator
* of the close to wait for the responding close_notify alert before
* closing the read side of the connection.
*
* The second sentence requires that we send a close_notify alert when we
* have received a close_notify alert. In practice, all SSL implementations
* close the socket immediately after sending a close_notify alert (which is
* allowed by the third sentence), so responding with a close_notify alert
* would result in a write failure with the ECONNRESET error. This is why
* we don't respond with a close_notify alert.
*
* Also, in the unlikely event that the TCP pipe is full and the peer stops
* reading, the SSL3_SendAlert call in ssl_SecureClose and ssl_SecureShutdown
* may block indefinitely in blocking mode, and may fail (without retrying)
* in non-blocking mode.
*/
int
ssl_SecureClose(sslSocket *ss)
{
int rv;
if (!(ss->shutdownHow & ssl_SHUTDOWN_SEND) &&
ss->firstHsDone &&
!ss->recvdCloseNotify) {
/* We don't want the final alert to be Nagle delayed. */
if (!ss->delayDisabled) {
ssl_EnableNagleDelay(ss, PR_FALSE);
ss->delayDisabled = 1;
}
(void)SSL3_SendAlert(ss, alert_warning, close_notify);
}
rv = ssl_DefClose(ss);
return rv;
}
/* Caller handles all locking */
int
ssl_SecureShutdown(sslSocket *ss, int nsprHow)
{
PRFileDesc *osfd = ss->fd->lower;
int rv;
PRIntn sslHow = nsprHow + 1;
if ((unsigned)nsprHow > PR_SHUTDOWN_BOTH) {
PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
return PR_FAILURE;
}
if ((sslHow & ssl_SHUTDOWN_SEND) != 0 &&
!(ss->shutdownHow & ssl_SHUTDOWN_SEND) &&
ss->firstHsDone &&
!ss->recvdCloseNotify) {
(void)SSL3_SendAlert(ss, alert_warning, close_notify);
}
rv = osfd->methods->shutdown(osfd, nsprHow);
ss->shutdownHow |= sslHow;
return rv;
}
/************************************************************************/
static SECStatus
tls13_CheckKeyUpdate(sslSocket *ss, CipherSpecDirection dir)
{
PRBool keyUpdate;
ssl3CipherSpec *spec;
sslSequenceNumber seqNum;
sslSequenceNumber margin;
SECStatus rv;
/* Bug 1413368: enable for DTLS */
if (ss->version < SSL_LIBRARY_VERSION_TLS_1_3 || IS_DTLS(ss)) {
return SECSuccess;
}
/* If both sides update at the same number, then this will cause two updates
* to happen at once. The problem is that the KeyUpdate itself consumes a
* sequence number, and that will trigger the reading side to request an
* update.
*
* If we have the writing side update first, the writer will be the one that
* drives the update. An update by the writer doesn't need a response, so
* it is more efficient overall. The margins here are pretty arbitrary, but
* having the write margin larger reduces the number of times that a
* KeyUpdate is sent by a reader. */
ssl_GetSpecReadLock(ss);
if (dir == CipherSpecRead) {
spec = ss->ssl3.crSpec;
margin = spec->cipherDef->max_records / 8;
} else {
spec = ss->ssl3.cwSpec;
margin = spec->cipherDef->max_records / 4;
}
seqNum = spec->seqNum;
keyUpdate = seqNum > spec->cipherDef->max_records - margin;
ssl_ReleaseSpecReadLock(ss);
if (!keyUpdate) {
return SECSuccess;
}
SSL_TRC(5, ("%d: SSL[%d]: automatic key update at %llx for %s cipher spec",
SSL_GETPID(), ss->fd, seqNum,
(dir == CipherSpecRead) ? "read" : "write"));
ssl_GetSSL3HandshakeLock(ss);
rv = tls13_SendKeyUpdate(ss, (dir == CipherSpecRead) ? update_requested : update_not_requested,
dir == CipherSpecWrite /* buffer */);
ssl_ReleaseSSL3HandshakeLock(ss);
return rv;
}
int
ssl_SecureRecv(sslSocket *ss, unsigned char *buf, int len, int flags)
{
int rv = 0;
if (ss->shutdownHow & ssl_SHUTDOWN_RCV) {
PORT_SetError(PR_SOCKET_SHUTDOWN_ERROR);
return PR_FAILURE;
}
if (flags & ~PR_MSG_PEEK) {
PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
return PR_FAILURE;
}
if (!ssl_SocketIsBlocking(ss) && !ss->opt.fdx) {
ssl_GetXmitBufLock(ss);
if (ss->pendingBuf.len != 0) {
rv = ssl_SendSavedWriteData(ss);
if ((rv < 0) && (PORT_GetError() != PR_WOULD_BLOCK_ERROR)) {
ssl_ReleaseXmitBufLock(ss);
return SECFailure;
}
}
ssl_ReleaseXmitBufLock(ss);
}
rv = 0;
if (!PR_CLIST_IS_EMPTY(&ss->ssl3.hs.bufferedEarlyData)) {
PORT_Assert(ss->version >= SSL_LIBRARY_VERSION_TLS_1_3);
return tls13_Read0RttData(ss, buf, len);
}
/* If any of these is non-zero, the initial handshake is not done. */
if (!ss->firstHsDone) {
ssl_Get1stHandshakeLock(ss);
if (ss->handshake) {
rv = ssl_Do1stHandshake(ss);
}
ssl_Release1stHandshakeLock(ss);
} else {
if (tls13_CheckKeyUpdate(ss, CipherSpecRead) != SECSuccess) {
rv = PR_FAILURE;
}
}
if (rv < 0) {
if (PORT_GetError() == PR_WOULD_BLOCK_ERROR &&
!PR_CLIST_IS_EMPTY(&ss->ssl3.hs.bufferedEarlyData)) {
PORT_Assert(ss->version >= SSL_LIBRARY_VERSION_TLS_1_3);
return tls13_Read0RttData(ss, buf, len);
}
return rv;
}
if (len == 0)
return 0;
rv = DoRecv(ss, (unsigned char *)buf, len, flags);
SSL_TRC(2, ("%d: SSL[%d]: recving %d bytes securely (errno=%d)",
SSL_GETPID(), ss->fd, rv, PORT_GetError()));
return rv;
}
int
ssl_SecureRead(sslSocket *ss, unsigned char *buf, int len)
{
return ssl_SecureRecv(ss, buf, len, 0);
}
/* Caller holds the SSL Socket's write lock. SSL_LOCK_WRITER(ss) */
int
ssl_SecureSend(sslSocket *ss, const unsigned char *buf, int len, int flags)
{
int rv = 0;
PRBool zeroRtt = PR_FALSE;
SSL_TRC(2, ("%d: SSL[%d]: SecureSend: sending %d bytes",
SSL_GETPID(), ss->fd, len));
if (ss->shutdownHow & ssl_SHUTDOWN_SEND) {
PORT_SetError(PR_SOCKET_SHUTDOWN_ERROR);
rv = PR_FAILURE;
goto done;
}
if (flags) {
PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
rv = PR_FAILURE;
goto done;
}
ssl_GetXmitBufLock(ss);
if (ss->pendingBuf.len != 0) {
PORT_Assert(ss->pendingBuf.len > 0);
rv = ssl_SendSavedWriteData(ss);
if (rv >= 0 && ss->pendingBuf.len != 0) {
PORT_Assert(ss->pendingBuf.len > 0);
PORT_SetError(PR_WOULD_BLOCK_ERROR);
rv = SECFailure;
}
}
ssl_ReleaseXmitBufLock(ss);
if (rv < 0) {
goto done;
}
if (len > 0)
ss->writerThread = PR_GetCurrentThread();
/* Check to see if we can write even though we're not finished.
*
* Case 1: False start
* Case 2: TLS 1.3 0-RTT
*/
if (!ss->firstHsDone) {
PRBool allowEarlySend = PR_FALSE;
ssl_Get1stHandshakeLock(ss);
if (ss->opt.enableFalseStart ||
(ss->opt.enable0RttData && !ss->sec.isServer)) {
ssl_GetSSL3HandshakeLock(ss);
/* The client can sometimes send before the handshake is fully
* complete. In TLS 1.2: false start; in TLS 1.3: 0-RTT. */
zeroRtt = ss->ssl3.hs.zeroRttState == ssl_0rtt_sent ||
ss->ssl3.hs.zeroRttState == ssl_0rtt_accepted;
allowEarlySend = ss->ssl3.hs.canFalseStart || zeroRtt;
ssl_ReleaseSSL3HandshakeLock(ss);
}
if (!allowEarlySend && ss->handshake) {
rv = ssl_Do1stHandshake(ss);
}
ssl_Release1stHandshakeLock(ss);
}
if (rv < 0) {
ss->writerThread = NULL;
goto done;
}
if (ss->firstHsDone) {
if (tls13_CheckKeyUpdate(ss, CipherSpecWrite) != SECSuccess) {
rv = PR_FAILURE;
goto done;
}
}
if (zeroRtt) {
/* There's a limit to the number of early data octets we can send.
*
* Note that taking this lock doesn't prevent the cipher specs from
* being changed out between here and when records are ultimately
* encrypted. The only effect of that is to occasionally do an
* unnecessary short write when data is identified as 0-RTT here but
* 1-RTT later.
*/
ssl_GetSpecReadLock(ss);
len = tls13_LimitEarlyData(ss, content_application_data, len);
ssl_ReleaseSpecReadLock(ss);
}
/* Check for zero length writes after we do housekeeping so we make forward
* progress.
*/
if (len == 0) {
rv = 0;
goto done;
}
PORT_Assert(buf != NULL);
if (!buf) {
PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
rv = PR_FAILURE;
goto done;
}
ssl_GetXmitBufLock(ss);
rv = ssl3_SendApplicationData(ss, buf, len, flags);
ssl_ReleaseXmitBufLock(ss);
ss->writerThread = NULL;
done:
if (rv < 0) {
SSL_TRC(2, ("%d: SSL[%d]: SecureSend: returning %d count, error %d",
SSL_GETPID(), ss->fd, rv, PORT_GetError()));
} else {
SSL_TRC(2, ("%d: SSL[%d]: SecureSend: returning %d count",
SSL_GETPID(), ss->fd, rv));
}
return rv;
}
int
ssl_SecureWrite(sslSocket *ss, const unsigned char *buf, int len)
{
return ssl_SecureSend(ss, buf, len, 0);
}
SECStatus
SSL_AlertReceivedCallback(PRFileDesc *fd, SSLAlertCallback cb, void *arg)
{
sslSocket *ss;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: unable to find socket in SSL_AlertReceivedCallback",
SSL_GETPID(), fd));
return SECFailure;
}
ss->alertReceivedCallback = cb;
ss->alertReceivedCallbackArg = arg;
return SECSuccess;
}
SECStatus
SSL_AlertSentCallback(PRFileDesc *fd, SSLAlertCallback cb, void *arg)
{
sslSocket *ss;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: unable to find socket in SSL_AlertSentCallback",
SSL_GETPID(), fd));
return SECFailure;
}
ss->alertSentCallback = cb;
ss->alertSentCallbackArg = arg;
return SECSuccess;
}
SECStatus
SSL_BadCertHook(PRFileDesc *fd, SSLBadCertHandler f, void *arg)
{
sslSocket *ss;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in SSLBadCertHook",
SSL_GETPID(), fd));
return SECFailure;
}
ss->handleBadCert = f;
ss->badCertArg = arg;
return SECSuccess;
}
/*
* Allow the application to pass the url or hostname into the SSL library
* so that we can do some checking on it. It will be used for the value in
* SNI extension of client hello message.
*/
SECStatus
SSL_SetURL(PRFileDesc *fd, const char *url)
{
sslSocket *ss = ssl_FindSocket(fd);
SECStatus rv = SECSuccess;
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in SSLSetURL",
SSL_GETPID(), fd));
return SECFailure;
}
ssl_Get1stHandshakeLock(ss);
ssl_GetSSL3HandshakeLock(ss);
if (ss->url) {
PORT_Free((void *)ss->url); /* CONST */
}
ss->url = (const char *)PORT_Strdup(url);
if (ss->url == NULL) {
rv = SECFailure;
}
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_Release1stHandshakeLock(ss);
return rv;
}
/*
* Allow the application to pass the set of trust anchors
*/
SECStatus
SSL_SetTrustAnchors(PRFileDesc *fd, CERTCertList *certList)
{
sslSocket *ss = ssl_FindSocket(fd);
CERTDistNames *names = NULL;
if (!certList) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in SSL_SetTrustAnchors",
SSL_GETPID(), fd));
return SECFailure;
}
names = CERT_DistNamesFromCertList(certList);
if (names == NULL) {
return SECFailure;
}
ssl_Get1stHandshakeLock(ss);
ssl_GetSSL3HandshakeLock(ss);
if (ss->ssl3.ca_list) {
CERT_FreeDistNames(ss->ssl3.ca_list);
}
ss->ssl3.ca_list = names;
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_Release1stHandshakeLock(ss);
return SECSuccess;
}
/*
** Returns Negative number on error, zero or greater on success.
** Returns the amount of data immediately available to be read.
*/
int
SSL_DataPending(PRFileDesc *fd)
{
sslSocket *ss;
int rv = 0;
ss = ssl_FindSocket(fd);
if (ss && ss->opt.useSecurity) {
ssl_GetRecvBufLock(ss);
rv = ss->gs.writeOffset - ss->gs.readOffset;
ssl_ReleaseRecvBufLock(ss);
}
return rv;
}
SECStatus
SSL_InvalidateSession(PRFileDesc *fd)
{
sslSocket *ss = ssl_FindSocket(fd);
SECStatus rv = SECFailure;
if (ss) {
ssl_Get1stHandshakeLock(ss);
ssl_GetSSL3HandshakeLock(ss);
if (ss->sec.ci.sid) {
ssl_UncacheSessionID(ss);
rv = SECSuccess;
}
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_Release1stHandshakeLock(ss);
}
return rv;
}
SECItem *
SSL_GetSessionID(PRFileDesc *fd)
{
sslSocket *ss;
SECItem *item = NULL;
ss = ssl_FindSocket(fd);
if (ss) {
ssl_Get1stHandshakeLock(ss);
ssl_GetSSL3HandshakeLock(ss);
if (ss->opt.useSecurity && ss->firstHsDone && ss->sec.ci.sid) {
item = (SECItem *)PORT_Alloc(sizeof(SECItem));
if (item) {
sslSessionID *sid = ss->sec.ci.sid;
item->len = sid->u.ssl3.sessionIDLength;
item->data = (unsigned char *)PORT_Alloc(item->len);
PORT_Memcpy(item->data, sid->u.ssl3.sessionID, item->len);
}
}
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_Release1stHandshakeLock(ss);
}
return item;
}
SECStatus
SSL_CertDBHandleSet(PRFileDesc *fd, CERTCertDBHandle *dbHandle)
{
sslSocket *ss;
ss = ssl_FindSocket(fd);
if (!ss)
return SECFailure;
if (!dbHandle) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
ss->dbHandle = dbHandle;
return SECSuccess;
}
/* DO NOT USE. This function was exported in ssl.def with the wrong signature;
* this implementation exists to maintain link-time compatibility.
*/
int
SSL_RestartHandshakeAfterCertReq(sslSocket *ss,
CERTCertificate *cert,
SECKEYPrivateKey *key,
CERTCertificateList *certChain)
{
PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
return -1;
}
/* DO NOT USE. This function was exported in ssl.def with the wrong signature;
* this implementation exists to maintain link-time compatibility.
*/
int
SSL_RestartHandshakeAfterServerCert(sslSocket *ss)
{
PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
return -1;
}
/* See documentation in ssl.h */
SECStatus
SSL_AuthCertificateComplete(PRFileDesc *fd, PRErrorCode error)
{
SECStatus rv;
sslSocket *ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in SSL_AuthCertificateComplete",
SSL_GETPID(), fd));
return SECFailure;
}
ssl_Get1stHandshakeLock(ss);
rv = ssl3_AuthCertificateComplete(ss, error);
ssl_Release1stHandshakeLock(ss);
return rv;
}
/* For more info see ssl.h */
SECStatus
SSL_SNISocketConfigHook(PRFileDesc *fd, SSLSNISocketConfig func,
void *arg)
{
sslSocket *ss;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in SNISocketConfigHook",
SSL_GETPID(), fd));
return SECFailure;
}
ss->sniSocketConfig = func;
ss->sniSocketConfigArg = arg;
return SECSuccess;
}
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