3 files changed, 31 insertions, 12 deletions

diff --git a/src/OSSupport/Network.h b/src/OSSupport/Network.h
index 32c7ecdd0..32163b710 100644
--- a/src/OSSupport/Network.h
+++ b/src/OSSupport/Network.h
@@ -113,8 +113,7 @@ public:
 	Returns empty string on success, non-empty error description on failure. */
 	virtual AString StartTLSClient(
 		cX509CertPtr a_OwnCert,
-		cCryptoKeyPtr a_OwnPrivKey,
-		const std::string_view hostname
+		cCryptoKeyPtr a_OwnPrivKey
 	) = 0;
 
 	/** Starts a TLS handshake as a server connection.
diff --git a/src/OSSupport/TCPLinkImpl.cpp b/src/OSSupport/TCPLinkImpl.cpp
index 86fa24a63..6bd33e9f5 100644
--- a/src/OSSupport/TCPLinkImpl.cpp
+++ b/src/OSSupport/TCPLinkImpl.cpp
@@ -17,10 +17,11 @@
 ////////////////////////////////////////////////////////////////////////////////
 // cTCPLinkImpl:
 
-cTCPLinkImpl::cTCPLinkImpl(cTCPLink::cCallbacksPtr a_LinkCallbacks):
+cTCPLinkImpl::cTCPLinkImpl(const std::string & a_Host, cTCPLink::cCallbacksPtr a_LinkCallbacks):
 	Super(std::move(a_LinkCallbacks)),
 	m_BufferEvent(bufferevent_socket_new(cNetworkSingleton::Get().GetEventBase(), -1, BEV_OPT_CLOSE_ON_FREE | BEV_OPT_THREADSAFE | BEV_OPT_DEFER_CALLBACKS | BEV_OPT_UNLOCK_CALLBACKS)),
 	m_LocalPort(0),
+	m_RemoteHost(a_Host),
 	m_RemotePort(0),
 	m_ShouldShutdown(false)
 {
@@ -30,7 +31,13 @@ cTCPLinkImpl::cTCPLinkImpl(cTCPLink::cCallbacksPtr a_LinkCallbacks):
 
 
 
-cTCPLinkImpl::cTCPLinkImpl(evutil_socket_t a_Socket, cTCPLink::cCallbacksPtr a_LinkCallbacks, cServerHandleImplPtr a_Server, const sockaddr * a_Address, socklen_t a_AddrLen):
+cTCPLinkImpl::cTCPLinkImpl(
+	evutil_socket_t a_Socket,
+	cTCPLink::cCallbacksPtr a_LinkCallbacks,
+	cServerHandleImplPtr a_Server,
+	const sockaddr * a_Address,
+	socklen_t a_AddrLen
+):
 	Super(std::move(a_LinkCallbacks)),
 	m_BufferEvent(bufferevent_socket_new(cNetworkSingleton::Get().GetEventBase(), a_Socket, BEV_OPT_CLOSE_ON_FREE | BEV_OPT_THREADSAFE | BEV_OPT_DEFER_CALLBACKS | BEV_OPT_UNLOCK_CALLBACKS)),
 	m_Server(std::move(a_Server)),
@@ -65,7 +72,7 @@ cTCPLinkImplPtr cTCPLinkImpl::Connect(const AString & a_Host, UInt16 a_Port, cTC
 	ASSERT(a_ConnectCallbacks != nullptr);
 
 	// Create a new link:
-	cTCPLinkImplPtr res{new cTCPLinkImpl(std::move(a_LinkCallbacks))};  // Cannot use std::make_shared here, constructor is not accessible
+	cTCPLinkImplPtr res{new cTCPLinkImpl(a_Host, std::move(a_LinkCallbacks))};  // Cannot use std::make_shared here, constructor is not accessible
 	res->m_ConnectCallbacks = std::move(a_ConnectCallbacks);
 	cNetworkSingleton::Get().AddLink(res);
 	res->m_Callbacks->OnLinkCreated(res);
@@ -237,8 +244,7 @@ void cTCPLinkImpl::Close(void)
 
 AString cTCPLinkImpl::StartTLSClient(
 	cX509CertPtr a_OwnCert,
-	cCryptoKeyPtr a_OwnPrivKey,
-	const std::string_view hostname
+	cCryptoKeyPtr a_OwnPrivKey
 )
 {
 	// Check preconditions:
@@ -264,7 +270,11 @@ AString cTCPLinkImpl::StartTLSClient(
 		m_TlsContext->Initialize(true);
 	}
 
-	m_TlsContext->SetExpectedPeerName(hostname);
+	// Enable SNI / peer name verification:
+	if (!m_RemoteHost.empty())
+	{
+		m_TlsContext->SetExpectedPeerName(m_RemoteHost);
+	}
 
 	m_TlsContext->SetSelf(cLinkTlsContextWPtr(m_TlsContext));
 
diff --git a/src/OSSupport/TCPLinkImpl.h b/src/OSSupport/TCPLinkImpl.h
index d26b1e358..c757303d2 100644
--- a/src/OSSupport/TCPLinkImpl.h
+++ b/src/OSSupport/TCPLinkImpl.h
@@ -40,9 +40,16 @@ public:
 
 	/** Creates a new link based on the given socket.
 	Used for connections accepted in a server using cNetwork::Listen().
+	a_Host is the hostname used for TLS SNI (can be empty in cases TLS is not used).
 	a_Address and a_AddrLen describe the remote peer that has connected.
 	The link is created disabled, you need to call Enable() to start the regular communication. */
-	cTCPLinkImpl(evutil_socket_t a_Socket, cCallbacksPtr a_LinkCallbacks, cServerHandleImplPtr a_Server, const sockaddr * a_Address, socklen_t a_AddrLen);
+	cTCPLinkImpl(
+		evutil_socket_t a_Socket,
+		cCallbacksPtr a_LinkCallbacks,
+		cServerHandleImplPtr a_Server,
+		const sockaddr * a_Address,
+		socklen_t a_AddrLen
+	);
 
 	/** Destroys the LibEvent handle representing the link. */
 	virtual ~cTCPLinkImpl() override;
@@ -68,8 +75,7 @@ public:
 	virtual void Close(void) override;
 	virtual AString StartTLSClient(
 		cX509CertPtr a_OwnCert,
-		cCryptoKeyPtr a_OwnPrivKey,
-		const std::string_view hostname
+		cCryptoKeyPtr a_OwnPrivKey
 	) override;
 	virtual AString StartTLSServer(
 		cX509CertPtr a_OwnCert,
@@ -151,6 +157,10 @@ protected:
 	/** The port of the local endpoint. Valid only after the socket has been connected. */
 	UInt16 m_LocalPort;
 
+	/** The original host parameter which was used for creating the link, either hostname or IP address.
+	Used for TLS SNI. */
+	AString m_RemoteHost;
+
 	/** The IP address of the remote endpoint. Valid only after the socket has been connected. */
 	AString m_RemoteIP;
 
@@ -175,7 +185,7 @@ protected:
 	Used for outgoing connections created using cNetwork::Connect().
 	To be used only by the Connect() factory function.
 	The link is created disabled, you need to call Enable() to start the regular communication. */
-	cTCPLinkImpl(const cCallbacksPtr a_LinkCallbacks);
+	cTCPLinkImpl(const std::string & a_Host, const cCallbacksPtr a_LinkCallbacks);
 
 	/** Callback that LibEvent calls when there's data available from the remote peer. */
 	static void ReadCallback(bufferevent * a_BufferEvent, void * a_Self);