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#ifndef EXAMPLE_CREDENTIALS_MANAGER_H__
#define EXAMPLE_CREDENTIALS_MANAGER_H__
#include <botan/credentials_manager.h>
#include <botan/x509self.h>
#include <botan/rsa.h>
#include <botan/dsa.h>
#include <botan/ecdsa.h>
#include <iostream>
#include <fstream>
bool value_exists(const std::vector<std::string>& vec,
const std::string& val)
{
for(size_t i = 0; i != vec.size(); ++i)
if(vec[i] == val)
return true;
return false;
}
class Credentials_Manager_Simple : public Botan::Credentials_Manager
{
public:
Credentials_Manager_Simple(Botan::RandomNumberGenerator& rng) : rng(rng) {}
std::string psk_identity_hint(const std::string& type,
const std::string& context)
{
return "";
}
std::string psk_identity(const std::string&, const std::string&,
const std::string& identity_hint)
{
return "Client_identity";
}
Botan::SymmetricKey psk(const std::string&, const std::string&,
const std::string& identity)
{
if(identity == "Client_identity")
return Botan::SymmetricKey("b5a72e1387552e6dc10766dc0eda12961f5b21e17f98ef4c41e6572e53bd7527");
throw Botan::Internal_Error("No PSK set for " + identity);
}
std::pair<Botan::X509_Certificate,Botan::Private_Key*>
load_or_make_cert(const std::string& hostname,
const std::string& key_type,
Botan::RandomNumberGenerator& rng)
{
using namespace Botan;
const std::string key_fsname_prefix = hostname + "." + key_type + ".";
const std::string key_file_name = key_fsname_prefix + "key";
const std::string cert_file_name = key_fsname_prefix + "crt";
try
{
X509_Certificate cert(cert_file_name);
Private_Key* key = PKCS8::load_key(key_file_name, rng);
std::cout << "Loaded existing key/cert from " << cert_file_name << " and " << key_file_name << "\n";
return std::make_pair(cert, key);
}
catch(...) {}
// Failed. Instead, make a new one
std::cout << "Creating new certificate for identifier '" << hostname << "'\n";
X509_Cert_Options opts;
opts.common_name = hostname;
opts.country = "US";
opts.email = "root@" + hostname;
opts.dns = hostname;
std::auto_ptr<Private_Key> key;
if(key_type == "rsa")
key.reset(new RSA_PrivateKey(rng, 2048));
else if(key_type == "dsa")
key.reset(new DSA_PrivateKey(rng, DL_Group("dsa/botan/2048")));
else if(key_type == "ecdsa")
key.reset(new ECDSA_PrivateKey(rng, EC_Group("secp256r1")));
else
throw std::runtime_error("Don't know what to do about key type '" + key_type + "'");
X509_Certificate cert =
X509::create_self_signed_cert(opts, *key, "SHA-256", rng);
// Now save both
std::cout << "Saving new " << key_type << " key to " << key_file_name << "\n";
std::ofstream key_file(key_file_name.c_str());
key_file << PKCS8::PEM_encode(*key, rng, "");
key_file.close();
std::cout << "Saving new " << key_type << " cert to " << key_file_name << "\n";
std::ofstream cert_file(cert_file_name.c_str());
cert_file << cert.PEM_encode() << "\n";
cert_file.close();
return std::make_pair(cert, key.release());
}
std::vector<Botan::X509_Certificate> cert_chain(
const std::vector<std::string>& cert_key_types,
const std::string& type,
const std::string& context)
{
using namespace Botan;
std::vector<X509_Certificate> certs;
try
{
if(type == "tls-server")
{
const std::string hostname = (context == "" ? "localhost" : context);
std::string key_name = "";
if(value_exists(cert_key_types, "RSA"))
key_name = "rsa";
else if(value_exists(cert_key_types, "DSA"))
key_name = "dsa";
else if(value_exists(cert_key_types, "ECDSA"))
key_name = "ecdsa";
std::pair<X509_Certificate, Private_Key*> cert_and_key =
load_or_make_cert(hostname, key_name, rng);
certs_and_keys[cert_and_key.first] = cert_and_key.second;
certs.push_back(cert_and_key.first);
}
else if(type == "tls-client")
{
X509_Certificate cert("user-rsa.crt");
Private_Key* key = PKCS8::load_key("user-rsa.key", rng);
certs_and_keys[cert] = key;
certs.push_back(cert);
}
}
catch(std::exception& e)
{
std::cout << e.what() << "\n";
}
return certs;
}
Botan::Private_Key* private_key_for(const Botan::X509_Certificate& cert,
const std::string& type,
const std::string& context)
{
return certs_and_keys[cert];
}
private:
Botan::RandomNumberGenerator& rng;
std::map<Botan::X509_Certificate, Botan::Private_Key*> certs_and_keys;
};
#endif
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