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-rw-r--r--src/OSSupport/TCPLinkImpl.cpp291
1 files changed, 289 insertions, 2 deletions
diff --git a/src/OSSupport/TCPLinkImpl.cpp b/src/OSSupport/TCPLinkImpl.cpp
index b15b6282f..df70f3f72 100644
--- a/src/OSSupport/TCPLinkImpl.cpp
+++ b/src/OSSupport/TCPLinkImpl.cpp
@@ -48,6 +48,9 @@ cTCPLinkImpl::cTCPLinkImpl(evutil_socket_t a_Socket, cTCPLink::cCallbacksPtr a_L
cTCPLinkImpl::~cTCPLinkImpl()
{
+ // If the TLS context still exists, free it:
+ m_TlsContext.reset();
+
bufferevent_free(m_BufferEvent);
}
@@ -129,7 +132,16 @@ bool cTCPLinkImpl::Send(const void * a_Data, size_t a_Length)
LOGD("%s: Cannot send data, the link is already shut down.", __FUNCTION__);
return false;
}
- return (bufferevent_write(m_BufferEvent, a_Data, a_Length) == 0);
+
+ // If running in TLS mode, push the data into the TLS context instead:
+ if (m_TlsContext != nullptr)
+ {
+ m_TlsContext->Send(a_Data, a_Length);
+ return true;
+ }
+
+ // Send the data:
+ return SendRaw(a_Data, a_Length);
}
@@ -138,6 +150,14 @@ bool cTCPLinkImpl::Send(const void * a_Data, size_t a_Length)
void cTCPLinkImpl::Shutdown(void)
{
+ // If running in TLS mode, notify the TLS layer:
+ if (m_TlsContext != nullptr)
+ {
+ m_TlsContext->NotifyClose();
+ m_TlsContext->ResetSelf();
+ m_TlsContext.reset();
+ }
+
// If there's no outgoing data, shutdown the socket directly:
if (evbuffer_get_length(bufferevent_get_output(m_BufferEvent)) == 0)
{
@@ -155,6 +175,14 @@ void cTCPLinkImpl::Shutdown(void)
void cTCPLinkImpl::Close(void)
{
+ // If running in TLS mode, notify the TLS layer:
+ if (m_TlsContext != nullptr)
+ {
+ m_TlsContext->NotifyClose();
+ m_TlsContext->ResetSelf();
+ m_TlsContext.reset();
+ }
+
// Disable all events on the socket, but keep it alive:
bufferevent_disable(m_BufferEvent, EV_READ | EV_WRITE);
if (m_Server == nullptr)
@@ -173,18 +201,98 @@ void cTCPLinkImpl::Close(void)
+AString cTCPLinkImpl::StartTLSClient(
+ cX509CertPtr a_OwnCert,
+ cCryptoKeyPtr a_OwnPrivKey
+)
+{
+ // Check preconditions:
+ if (m_TlsContext != nullptr)
+ {
+ return "TLS is already active on this link";
+ }
+ if (
+ ((a_OwnCert == nullptr) && (a_OwnPrivKey != nullptr)) ||
+ ((a_OwnCert != nullptr) && (a_OwnPrivKey != nullptr))
+ )
+ {
+ return "Either provide both the certificate and private key, or neither";
+ }
+
+ // Create the TLS context:
+ m_TlsContext.reset(new cLinkTlsContext(*this));
+ m_TlsContext->Initialize(true);
+ if (a_OwnCert != nullptr)
+ {
+ m_TlsContext->SetOwnCert(a_OwnCert, a_OwnPrivKey);
+ }
+ m_TlsContext->SetSelf(cLinkTlsContextWPtr(m_TlsContext));
+
+ // Start the handshake:
+ m_TlsContext->Handshake();
+ return "";
+}
+
+
+
+
+
+AString cTCPLinkImpl::StartTLSServer(
+ cX509CertPtr a_OwnCert,
+ cCryptoKeyPtr a_OwnPrivKey,
+ const AString & a_StartTLSData
+)
+{
+ // Check preconditions:
+ if (m_TlsContext != nullptr)
+ {
+ return "TLS is already active on this link";
+ }
+ if ((a_OwnCert == nullptr) || (a_OwnPrivKey == nullptr))
+ {
+ return "Provide the server certificate and private key";
+ }
+
+ // Create the TLS context:
+ m_TlsContext.reset(new cLinkTlsContext(*this));
+ m_TlsContext->Initialize(false);
+ m_TlsContext->SetOwnCert(a_OwnCert, a_OwnPrivKey);
+ m_TlsContext->SetSelf(cLinkTlsContextWPtr(m_TlsContext));
+
+ // Push the initial data:
+ m_TlsContext->StoreReceivedData(a_StartTLSData.data(), a_StartTLSData.size());
+
+ // Start the handshake:
+ m_TlsContext->Handshake();
+ return "";
+}
+
+
+
+
+
void cTCPLinkImpl::ReadCallback(bufferevent * a_BufferEvent, void * a_Self)
{
ASSERT(a_Self != nullptr);
cTCPLinkImpl * Self = static_cast<cTCPLinkImpl *>(a_Self);
+ ASSERT(Self->m_BufferEvent == a_BufferEvent);
ASSERT(Self->m_Callbacks != nullptr);
// Read all the incoming data, in 1024-byte chunks:
char data[1024];
size_t length;
+ auto tlsContext = Self->m_TlsContext;
while ((length = bufferevent_read(a_BufferEvent, data, sizeof(data))) > 0)
{
- Self->m_Callbacks->OnReceivedData(data, length);
+ if (tlsContext != nullptr)
+ {
+ ASSERT(tlsContext->IsLink(Self));
+ tlsContext->StoreReceivedData(data, length);
+ }
+ else
+ {
+ Self->ReceivedCleartextData(data, length);
+ }
}
}
@@ -262,6 +370,13 @@ void cTCPLinkImpl::EventCallback(bufferevent * a_BufferEvent, short a_What, void
// If the connection has been closed, call the link callback and remove the connection:
if (a_What & BEV_EVENT_EOF)
{
+ // If running in TLS mode and there's data left in the TLS contect, report it:
+ auto tlsContext = Self->m_TlsContext;
+ if (tlsContext != nullptr)
+ {
+ tlsContext->FlushBuffers();
+ }
+
Self->m_Callbacks->OnRemoteClosed();
if (Self->m_Server != nullptr)
{
@@ -357,6 +472,178 @@ void cTCPLinkImpl::DoActualShutdown(void)
+bool cTCPLinkImpl::SendRaw(const void * a_Data, size_t a_Length)
+{
+ return (bufferevent_write(m_BufferEvent, a_Data, a_Length) == 0);
+}
+
+
+
+
+
+void cTCPLinkImpl::ReceivedCleartextData(const char * a_Data, size_t a_Length)
+{
+ ASSERT(m_Callbacks != nullptr);
+ m_Callbacks->OnReceivedData(a_Data, a_Length);
+}
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cTCPLinkImpl::cLinkTlsContext:
+
+cTCPLinkImpl::cLinkTlsContext::cLinkTlsContext(cTCPLinkImpl & a_Link):
+ m_Link(a_Link)
+{
+}
+
+
+
+
+
+void cTCPLinkImpl::cLinkTlsContext::SetSelf(cLinkTlsContextWPtr a_Self)
+{
+ m_Self = a_Self;
+}
+
+
+
+
+
+void cTCPLinkImpl::cLinkTlsContext::ResetSelf(void)
+{
+ m_Self.reset();
+}
+
+
+
+
+
+void cTCPLinkImpl::cLinkTlsContext::StoreReceivedData(const char * a_Data, size_t a_NumBytes)
+{
+ // Hold self alive for the duration of this function
+ cLinkTlsContextPtr Self(m_Self);
+
+ m_EncryptedData.append(a_Data, a_NumBytes);
+
+ // Try to finish a pending handshake:
+ TryFinishHandshaking();
+
+ // Flush any cleartext data that can be "received":
+ FlushBuffers();
+}
+
+
+
+
+
+void cTCPLinkImpl::cLinkTlsContext::FlushBuffers(void)
+{
+ // Hold self alive for the duration of this function
+ cLinkTlsContextPtr Self(m_Self);
+
+ // If the handshake didn't complete yet, bail out:
+ if (!HasHandshaken())
+ {
+ return;
+ }
+
+ char Buffer[1024];
+ int NumBytes;
+ while ((NumBytes = ReadPlain(Buffer, sizeof(Buffer))) > 0)
+ {
+ m_Link.ReceivedCleartextData(Buffer, static_cast<size_t>(NumBytes));
+ if (m_Self.expired())
+ {
+ // The callback closed the SSL context, bail out
+ return;
+ }
+ }
+}
+
+
+
+
+
+void cTCPLinkImpl::cLinkTlsContext::TryFinishHandshaking(void)
+{
+ // Hold self alive for the duration of this function
+ cLinkTlsContextPtr Self(m_Self);
+
+ // If the handshake hasn't finished yet, retry:
+ if (!HasHandshaken())
+ {
+ Handshake();
+ // If the handshake succeeded, write all the queued plaintext data:
+ if (HasHandshaken())
+ {
+ m_Link.GetCallbacks()->OnTlsHandshakeCompleted();
+ WritePlain(m_CleartextData.data(), m_CleartextData.size());
+ m_CleartextData.clear();
+ }
+ }
+}
+
+
+
+
+
+void cTCPLinkImpl::cLinkTlsContext::Send(const void * a_Data, size_t a_Length)
+{
+ // Hold self alive for the duration of this function
+ cLinkTlsContextPtr Self(m_Self);
+
+ // If the handshake hasn't completed yet, queue the data:
+ if (!HasHandshaken())
+ {
+ m_CleartextData.append(reinterpret_cast<const char *>(a_Data), a_Length);
+ TryFinishHandshaking();
+ return;
+ }
+
+ // The connection is all set up, write the cleartext data into the SSL context:
+ WritePlain(a_Data, a_Length);
+ FlushBuffers();
+}
+
+
+
+
+
+int cTCPLinkImpl::cLinkTlsContext::ReceiveEncrypted(unsigned char * a_Buffer, size_t a_NumBytes)
+{
+ // Hold self alive for the duration of this function
+ cLinkTlsContextPtr Self(m_Self);
+
+ // If there's nothing queued in the buffer, report empty buffer:
+ if (m_EncryptedData.empty())
+ {
+ return POLARSSL_ERR_NET_WANT_READ;
+ }
+
+ // Copy as much data as possible to the provided buffer:
+ size_t BytesToCopy = std::min(a_NumBytes, m_EncryptedData.size());
+ memcpy(a_Buffer, m_EncryptedData.data(), BytesToCopy);
+ m_EncryptedData.erase(0, BytesToCopy);
+ return static_cast<int>(BytesToCopy);
+}
+
+
+
+
+
+int cTCPLinkImpl::cLinkTlsContext::SendEncrypted(const unsigned char * a_Buffer, size_t a_NumBytes)
+{
+ m_Link.SendRaw(a_Buffer, a_NumBytes);
+ return static_cast<int>(a_NumBytes);
+}
+
+
+
+
+
////////////////////////////////////////////////////////////////////////////////
// cNetwork API: