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#include "louloulibs.h"
#ifdef BOTAN_FOUND
#include <network/tcp_socket_handler.hpp>
#include <network/credentials_manager.hpp>
#include <logger/logger.hpp>
#include <botan/tls_exceptn.h>
#include <config/config.hpp>
#ifdef USE_DATABASE
# include <database/database.hpp>
#endif
/**
* TODO find a standard way to find that out.
*/
static const std::vector<std::string> default_cert_files = {
"/etc/ssl/certs/ca-bundle.crt",
"/etc/pki/tls/certs/ca-bundle.crt",
"/etc/ssl/certs/ca-certificates.crt",
"/etc/ca-certificates/extracted/tls-ca-bundle.pem"
};
Botan::Certificate_Store_In_Memory Basic_Credentials_Manager::certificate_store;
bool Basic_Credentials_Manager::certs_loaded = false;
Basic_Credentials_Manager::Basic_Credentials_Manager(const TCPSocketHandler* const socket_handler):
Botan::Credentials_Manager(),
socket_handler(socket_handler),
trusted_fingerprint{}
{
this->load_certs();
}
void Basic_Credentials_Manager::set_trusted_fingerprint(const std::string& fingerprint)
{
this->trusted_fingerprint = fingerprint;
}
void Basic_Credentials_Manager::verify_certificate_chain(const std::string& type,
const std::string& purported_hostname,
const std::vector<Botan::X509_Certificate>& certs)
{
log_debug("Checking remote certificate (" << type << ") for hostname " << purported_hostname);
try
{
Botan::Credentials_Manager::verify_certificate_chain(type, purported_hostname, certs);
log_debug("Certificate is valid");
}
catch (const std::exception& tls_exception)
{
log_warning("TLS certificate check failed: " << tls_exception.what());
if (!this->trusted_fingerprint.empty() && !certs.empty() &&
this->trusted_fingerprint == certs[0].fingerprint() &&
certs[0].matches_dns_name(purported_hostname))
// We trust the certificate, based on the trusted fingerprint and
// the fact that the hostname matches
return;
if (this->socket_handler->abort_on_invalid_cert())
throw;
}
}
void Basic_Credentials_Manager::load_certs()
{
// Only load the certificates the first time
if (Basic_Credentials_Manager::certs_loaded)
return;
const std::string conf_path = Config::get("ca_file", "");
std::vector<std::string> paths;
if (conf_path.empty())
paths = default_cert_files;
else
paths.push_back(conf_path);
for (const auto& path: paths)
{
try
{
Botan::DataSource_Stream bundle(path);
log_debug("Using ca bundle: " << path);
while (!bundle.end_of_data() && bundle.check_available(27))
{
const Botan::X509_Certificate cert(bundle);
Basic_Credentials_Manager::certificate_store.add_certificate(cert);
}
// Only use the first file that can successfully be read.
goto success;
}
catch (Botan::Stream_IO_Error& e)
{
log_debug(e.what());
}
}
// If we could not open one of the files, print a warning
log_warning("The CA could not be loaded, TLS negociation will probably fail.");
success:
Basic_Credentials_Manager::certs_loaded = true;
}
std::vector<Botan::Certificate_Store*> Basic_Credentials_Manager::trusted_certificate_authorities(const std::string&, const std::string&)
{
return {&this->certificate_store};
}
#endif