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// BlockingSslClientSocket.cpp
// Implements the cBlockingSslClientSocket class representing a blocking TCP socket with client SSL encryption over it
#include "Globals.h"
#include "BlockingSslClientSocket.h"
cBlockingSslClientSocket::cBlockingSslClientSocket(void) :
m_Ssl(*this),
m_IsConnected(false)
{
// Nothing needed yet
}
bool cBlockingSslClientSocket::Connect(const AString & a_ServerName, UInt16 a_Port)
{
// If already connected, report an error:
if (m_IsConnected)
{
// TODO: Handle this better - if connected to the same server and port, and the socket is alive, return success
m_LastErrorText = "Already connected";
return false;
}
// Connect the underlying socket:
m_Socket.CreateSocket(cSocket::IPv4);
if (!m_Socket.ConnectIPv4(a_ServerName.c_str(), a_Port))
{
Printf(m_LastErrorText, "Socket connect failed: %s", m_Socket.GetLastErrorString().c_str());
return false;
}
// Initialize the SSL:
int ret = m_Ssl.Initialize(true);
if (ret != 0)
{
Printf(m_LastErrorText, "SSL initialization failed: -0x%x", -ret);
return false;
}
// If we have been assigned a trusted CA root cert store, push it into the SSL context:
if (m_CACerts.get() != nullptr)
{
m_Ssl.SetCACerts(m_CACerts, m_ExpectedPeerName);
}
ret = m_Ssl.Handshake();
if (ret != 0)
{
Printf(m_LastErrorText, "SSL handshake failed: -0x%x", -ret);
return false;
}
m_IsConnected = true;
return true;
}
bool cBlockingSslClientSocket::SetTrustedRootCertsFromString(const AString & a_CACerts, const AString & a_ExpectedPeerName)
{
// Warn if used multiple times, but don't signal an error:
if (m_CACerts.get() != nullptr)
{
LOGWARNING(
"SSL: Trying to set multiple trusted CA root cert stores, only the last one will be used. Name: %s",
a_ExpectedPeerName.c_str()
);
}
// Parse the cert:
m_CACerts.reset(new cX509Cert);
int ret = m_CACerts->Parse(a_CACerts.data(), a_CACerts.size());
if (ret < 0)
{
Printf(m_LastErrorText, "CA cert parsing failed: -0x%x", -ret);
return false;
}
m_ExpectedPeerName = a_ExpectedPeerName;
return true;
}
bool cBlockingSslClientSocket::Send(const void * a_Data, size_t a_NumBytes)
{
ASSERT(m_IsConnected);
// Keep sending the data until all of it is sent:
const char * Data = (const char *)a_Data;
size_t NumBytes = a_NumBytes;
for (;;)
{
int res = m_Ssl.WritePlain(a_Data, a_NumBytes);
if (res < 0)
{
ASSERT(res != POLARSSL_ERR_NET_WANT_READ); // This should never happen with callback-based SSL
ASSERT(res != POLARSSL_ERR_NET_WANT_WRITE); // This should never happen with callback-based SSL
Printf(m_LastErrorText, "Data cannot be written to SSL context: -0x%x", -res);
return false;
}
else
{
Data += res;
NumBytes -= res;
if (NumBytes == 0)
{
return true;
}
}
}
}
int cBlockingSslClientSocket::Receive(void * a_Data, size_t a_MaxBytes)
{
ASSERT(m_IsConnected);
int res = m_Ssl.ReadPlain(a_Data, a_MaxBytes);
if (res < 0)
{
Printf(m_LastErrorText, "Data cannot be read form SSL context: -0x%x", -res);
}
return res;
}
void cBlockingSslClientSocket::Disconnect(void)
{
// Ignore if not connected
if (!m_IsConnected)
{
return;
}
m_Ssl.NotifyClose();
m_Socket.CloseSocket();
m_IsConnected = false;
}
int cBlockingSslClientSocket::ReceiveEncrypted(unsigned char * a_Buffer, size_t a_NumBytes)
{
int res = m_Socket.Receive((char *)a_Buffer, a_NumBytes, 0);
if (res < 0)
{
// PolarSSL's net routines distinguish between connection reset and general failure, we don't need to
return POLARSSL_ERR_NET_RECV_FAILED;
}
return res;
}
int cBlockingSslClientSocket::SendEncrypted(const unsigned char * a_Buffer, size_t a_NumBytes)
{
int res = m_Socket.Send((const char *)a_Buffer, a_NumBytes);
if (res < 0)
{
// PolarSSL's net routines distinguish between connection reset and general failure, we don't need to
return POLARSSL_ERR_NET_SEND_FAILED;
}
return res;
}
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