Can't validate my self-signed certificate with boost - c++

Question

I generated by self signed certificate (with my own CA) and now I'm trying to have a boost ASIO client verify the identity of the server. I verified these with openssl and the verification seems to work.
The server and client code is respectively here and here.
I only modified the following parts:
class server
{
public:
server(boost::asio::io_service& io_service, unsigned short port)
: io_service_(io_service),
acceptor_(io_service,
boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), port)),
context_(boost::asio::ssl::context::tlsv12_server)
{
context_.set_options(
boost::asio::ssl::context::default_workarounds
| boost::asio::ssl::context::no_sslv2
| boost::asio::ssl::context::single_dh_use);
context_.set_password_callback(boost::bind(&server::get_password, this));
// Use the certificate for my website that I had generated context_.use_certificate_file("/home/paul/ca/intermediate/certs/mywebsite.net.cert.pem", boost::asio::ssl::context::pem);
// Not sure if I need this, probably not. I do have an intermediate CA though
//context_.use_certificate_chain_file("/home/paul/ca/intermediate/certs/ca-chain.cert.pem");
// Use website private key context_.use_private_key_file("/home/paul/ca/intermediate/private/mywebsite.net.key.pem", boost::asio::ssl::context::pem);
context_.use_tmp_dh_file("/home/paul/SSLTest/dh512.pem");
start_accept();
}
and in the client:
bool verify_certificate(bool preverified,
boost::asio::ssl::verify_context& ctx)
{
// The verify callback can be used to check whether the certificate that is
// being presented is valid for the peer. For example, RFC 2818 describes
// the steps involved in doing this for HTTPS. Consult the OpenSSL
// documentation for more details. Note that the callback is called once
// for each certificate in the certificate chain, starting from the root
// certificate authority.
// In this example we will simply print the certificate's subject name.
char subject_name[256];
X509* cert = X509_STORE_CTX_get_current_cert(ctx.native_handle());
X509_NAME_oneline(X509_get_subject_name(cert), subject_name, 256);
std::cout << "Verifying " << subject_name << "\n";
std::cout << "preverified: " << std::boolalpha << preverified << "\n";
return preverified;
}
...
int main(int argc, char* argv[])
{
try
{
boost::asio::io_service io_service;
boost::asio::ip::tcp::resolver resolver(io_service);
boost::asio::ip::tcp::resolver::query query("localhost", "3232");
boost::asio::ip::tcp::resolver::iterator iterator = resolver.resolve(query);
boost::asio::ssl::context ctx(boost::asio::ssl::context::tlsv12_client);
std::ifstream ca_file("/home/paul/ca/certs/ca.cert.pem", std::ios::binary | std::ios::ate);
std::vector<char> data;
auto size = ca_file.tellg();
data.resize(size);
ca_file.seekg(0, std::ios::beg);
ca_file.read(data.data(), size);
ca_file.close();
// Have my own CA added to the list of known CAs
ctx.add_certificate_authority(boost::asio::buffer(data, data.size()));
// Not sure if I need something here, the CA should be enough to
// validate the server's certificate prompted (even if signed by the
// intermediate CA)
//ctx.load_verify_file("/home/paul/ca/private/ca.key.pem");
//ctx.load_verify_file("/home/paul/ca/intermediate/private/intermediate.key.pem");
client c(io_service, ctx, iterator);
However this is not working and the client is returning
Verifying /C=IT/ST=Italy/L=Milan/O=MyCompanyLtd/OU=MyCompanyLtd Auth/CN=mywebsite.net/emailAddress=info#mywebsite.net
preverified: false
Handshake failed: certificate verify failed
I'm aware that there's no verification being performed in the callback but I thought that the callback set in set_verification_callback would be called after a pre-verification (hence the preverified parameter).
Where am I getting wrong?

Answer 1

It's not going to work with just the data you provided. There's not enough information to validiate the certificate. You should generally call these two.
ctx.use_certificate_chain_file("path");
ctx.use_private_key_file("path", boost::asio::ssl::context::pem);