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Merge pull request #1422 from domosekai/timeout

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Fix use-after-free timeout issue for L2TP and SSTP
This commit is contained in:
Ilya Shipitsin 2021-07-10 22:34:57 +05:00 committed by GitHub
commit bd501ba9bf
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8 changed files with 29 additions and 22 deletions
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9
src/Cedar/Proto_L2TP.c
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@ -2008,7 +2008,6 @@ UINT CalcL2TPMss(L2TP_SERVER *l2tp, L2TP_TUNNEL *t, L2TP_SESSION *s)
// Start the L2TP thread
void StartL2TPThread(L2TP_SERVER *l2tp, L2TP_TUNNEL *t, L2TP_SESSION *s)
{
PPP_SESSION* underlyingSession;
// Validate arguments
if (l2tp == NULL || t == NULL || s == NULL)
{
@ -2037,11 +2036,9 @@ void StartL2TPThread(L2TP_SERVER *l2tp, L2TP_TUNNEL *t, L2TP_SESSION *s)
}
// Create a PPP thread
underlyingSession = NewPPPSession(l2tp->Cedar, &t->ClientIp, t->ClientPort, &t->ServerIp, t->ServerPort,
s->Thread = NewPPPSession(l2tp->Cedar, &t->ClientIp, t->ClientPort, &t->ServerIp, t->ServerPort,
s->TubeSend, s->TubeRecv, L2TP_IPC_POSTFIX, tmp, t->HostName, l2tp->CryptName,
CalcL2TPMss(l2tp, t, s));
s->Thread = underlyingSession->SessionThread;
s->PPPSession = underlyingSession;
}
}
@ -2145,9 +2142,9 @@ void L2TPProcessInterrupts(L2TP_SERVER *l2tp)
{
L2TP_SESSION* s = LIST_DATA(t->SessionList, i);
if (s->PPPSession != NULL && s->PPPSession->DataTimeout > l2tpTimeout)
if (s->TubeRecv != NULL && s->TubeRecv->DataTimeout > l2tpTimeout)
{
l2tpTimeout = s->PPPSession->DataTimeout;
l2tpTimeout = s->TubeRecv->DataTimeout;
}
}

1
src/Cedar/Proto_L2TP.h
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@ -171,7 +171,6 @@ struct L2TP_SESSION
UINT64 DisconnectTimeout; // Disconnection completion time-out
bool HasThread; // Whether have a thread
THREAD *Thread; // Thread
PPP_SESSION* PPPSession; // Underlying PPP session
TUBE *TubeSend; // Tube of PPP to L2TP direction
TUBE *TubeRecv; // Tube of L2TP to PPP direction
UINT PseudowireType; // Type of L2TPv3 virtual line

24
src/Cedar/Proto_PPP.c
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@ -552,7 +552,7 @@ void PPPThread(THREAD *thread, void *param)
// Entry point
// Create a new PPP session
PPP_SESSION *NewPPPSession(CEDAR *cedar, IP *client_ip, UINT client_port, IP *server_ip, UINT server_port, TUBE *send_tube, TUBE *recv_tube, char *postfix, char *client_software_name, char *client_hostname, char *crypt_name, UINT adjust_mss)
THREAD *NewPPPSession(CEDAR *cedar, IP *client_ip, UINT client_port, IP *server_ip, UINT server_port, TUBE *send_tube, TUBE *recv_tube, char *postfix, char *client_software_name, char *client_hostname, char *crypt_name, UINT adjust_mss)
{
PPP_SESSION *p;
THREAD *t;
@ -622,9 +622,7 @@ PPP_SESSION *NewPPPSession(CEDAR *cedar, IP *client_ip, UINT client_port, IP *se
// Thread creation
t = NewThread(PPPThread, p);
p->SessionThread = t;
return p;
return t;
}
// PPP processing functions
@ -1549,6 +1547,10 @@ bool PPPProcessPAPRequestPacket(PPP_SESSION *p, PPP_PACKET *pp)
// Setting user timeouts
p->PacketRecvTimeout = (UINT64)p->Ipc->Policy->TimeOut * 1000 * 3 / 4; // setting to 3/4 of the user timeout
p->DataTimeout = (UINT64)p->Ipc->Policy->TimeOut * 1000;
if (p->TubeRecv != NULL)
{
p->TubeRecv->DataTimeout = p->DataTimeout;
}
p->UserConnectionTimeout = (UINT64)p->Ipc->Policy->AutoDisconnect * 1000;
p->UserConnectionTick = Tick64();
@ -2874,6 +2876,10 @@ bool PPPParseMSCHAP2ResponsePacket(PPP_SESSION *p, PPP_PACKET *pp)
// Setting user timeouts
p->PacketRecvTimeout = (UINT64)p->Ipc->Policy->TimeOut * 1000 * 3 / 4; // setting to 3/4 of the user timeout
p->DataTimeout = (UINT64)p->Ipc->Policy->TimeOut * 1000;
if (p->TubeRecv != NULL)
{
p->TubeRecv->DataTimeout = p->DataTimeout;
}
p->UserConnectionTimeout = (UINT64)p->Ipc->Policy->AutoDisconnect * 1000;
p->UserConnectionTick = Tick64();
@ -3285,6 +3291,16 @@ bool PPPProcessEAPTlsResponse(PPP_SESSION *p, PPP_EAP *eap_packet, UINT eapTlsSi
p->Ipc = ipc;
PPPSetStatus(p, PPP_STATUS_AUTH_SUCCESS);
// Setting user timeouts
p->PacketRecvTimeout = (UINT64)p->Ipc->Policy->TimeOut * 1000 * 3 / 4; // setting to 3/4 of the user timeout
p->DataTimeout = (UINT64)p->Ipc->Policy->TimeOut * 1000;
if (p->TubeRecv != NULL)
{
p->TubeRecv->DataTimeout = p->DataTimeout;
}
p->UserConnectionTimeout = (UINT64)p->Ipc->Policy->AutoDisconnect * 1000;
p->UserConnectionTick = Tick64();
// Just send an EAP-Success
pack = ZeroMalloc(sizeof(PPP_PACKET));
pack->IsControl = true;

4
src/Cedar/Proto_PPP.h
View File

@ -313,8 +313,6 @@ struct PPP_SESSION
UINT64 DataTimeout;
UINT64 UserConnectionTimeout;
UINT64 UserConnectionTick;
THREAD *SessionThread; // Thread of the PPP session
};
@ -325,7 +323,7 @@ struct PPP_SESSION
void PPPThread(THREAD *thread, void *param);
// Entry point
PPP_SESSION *NewPPPSession(CEDAR *cedar, IP *client_ip, UINT client_port, IP *server_ip, UINT server_port, TUBE *send_tube, TUBE *recv_tube, char *postfix, char *client_software_name, char *client_hostname, char *crypt_name, UINT adjust_mss);
THREAD *NewPPPSession(CEDAR *cedar, IP *client_ip, UINT client_port, IP *server_ip, UINT server_port, TUBE *send_tube, TUBE *recv_tube, char *postfix, char *client_software_name, char *client_hostname, char *crypt_name, UINT adjust_mss);
// PPP processing functions
bool PPPRejectUnsupportedPacket(PPP_SESSION *p, PPP_PACKET *pp);

10
src/Cedar/Proto_SSTP.c
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@ -275,8 +275,6 @@ void SstpProcessControlPacket(SSTP_SERVER *s, SSTP_PACKET *p)
// Process the SSTP received data packet
void SstpProcessDataPacket(SSTP_SERVER *s, SSTP_PACKET *p)
{
PPP_SESSION *underlyingSession;
// Validate arguments
if (s == NULL || p == NULL || p->IsControl)
{
@ -288,11 +286,9 @@ void SstpProcessDataPacket(SSTP_SERVER *s, SSTP_PACKET *p)
if (s->PPPThread == NULL)
{
// Create a thread to initialize the new PPP module
underlyingSession = NewPPPSession(s->Cedar, &s->ClientIp, s->ClientPort, &s->ServerIp, s->ServerPort,
s->PPPThread = NewPPPSession(s->Cedar, &s->ClientIp, s->ClientPort, &s->ServerIp, s->ServerPort,
s->TubeSend, s->TubeRecv, SSTP_IPC_POSTFIX, SSTP_IPC_CLIENT_NAME,
s->ClientHostName, s->ClientCipherName, 0);
s->PPPSession = underlyingSession;
s->PPPThread = underlyingSession->SessionThread;
}
// Pass the received data to the PPP module
@ -444,9 +440,9 @@ void SstpProcessInterrupt(SSTP_SERVER *s)
}
}
if (s->PPPSession != NULL && s->PPPSession->DataTimeout > sstpTimeout)
if (s->TubeRecv != NULL && s->TubeRecv->DataTimeout > sstpTimeout)
{
sstpTimeout = s->PPPSession->DataTimeout;
sstpTimeout = s->TubeRecv->DataTimeout;
}
if ((s->LastRecvTick + sstpTimeout) <= s->Now)

1
src/Cedar/Proto_SSTP.h
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@ -119,7 +119,6 @@ struct SSTP_SERVER
UINT64 LastRecvTick; // Tick when some data has received at the end
bool FlushRecvTube; // Flag whether to flush the reception tube
UINT EstablishedCount; // Number of session establishment
PPP_SESSION *PPPSession; // Underlying PPP Session
};

1
src/Mayaqua/Network.c
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@ -16899,6 +16899,7 @@ TUBE *NewTube(UINT size_of_header)
t->SockEvent = NewSockEvent();
t->SizeOfHeader = size_of_header;
t->DataTimeout = 0;
return t;
}

1
src/Mayaqua/Network.h
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@ -412,6 +412,7 @@ struct TUBE
bool IsInFlushList; // Whether it is registered in the Tube Flush List
void *Param1, *Param2, *Param3;
UINT IntParam1, IntParam2, IntParam3;
UINT64 DataTimeout;
};
// Data that is to send and to receive in the tube