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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/srp6.h>
#include <botan/srp6_files.h>
#include <botan/ecdsa.h>
#include <iostream>
#include <fstream>
#include <memory>
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)
{
m_certstores.push_back(new Botan::Certificate_Store_In_Memory("/usr/share/ca-certificates"));
}
std::string srp_identifier(const std::string& type,
const std::string& hostname)
{
if(type == "tls-client" && hostname == "srp-host")
return "user";
return "";
}
bool attempt_srp(const std::string& type,
const std::string& hostname)
{
if(hostname == "srp-host")
return true;
return false;
}
std::vector<Botan::Certificate_Store*>
trusted_certificate_authorities(const std::string& type,
const std::string& hostname)
{
// can very based on hostname eg for pinning
return m_certstores;
}
void verify_certificate_chain(
const std::string& type,
const std::string& purported_hostname,
const std::vector<Botan::X509_Certificate>& cert_chain)
{
try
{
Botan::Credentials_Manager::verify_certificate_chain(type,
purported_hostname,
cert_chain);
}
catch(std::exception& e)
{
std::cout << "Certificate verification failed - " << e.what() << " - but will ignore\n";
}
}
std::string srp_password(const std::string& type,
const std::string& hostname,
const std::string& identifier)
{
if(type == "tls-client" && hostname == "localhost" && identifier == "user")
return "password";
return "";
}
bool srp_verifier(const std::string& type,
const std::string& context,
const std::string& identifier,
std::string& group_id,
Botan::BigInt& verifier,
std::vector<Botan::byte>& salt,
bool generate_fake_on_unknown)
{
std::string pass = srp_password("tls-client", context, identifier);
if(pass == "")
{
if(!generate_fake_on_unknown)
return false;
pass.resize(16);
rng.randomize((Botan::byte*)&pass[0], pass.size());
}
group_id = "modp/srp/2048";
salt.resize(16);
rng.randomize(&salt[0], salt.size());
verifier = Botan::generate_srp6_verifier(identifier,
pass,
salt,
group_id,
"SHA-1");
return true;
}
std::string psk_identity_hint(const std::string&,
const std::string&)
{
return "";
}
std::string psk_identity(const std::string&, const std::string&,
const std::string& identity_hint)
{
//return "lloyd";
return "Client_identity";
}
Botan::SymmetricKey psk(const std::string& type, const std::string& context,
const std::string& identity)
{
if(type == "tls-server" && context == "session-ticket")
{
if(session_ticket_key.length() == 0)
session_ticket_key = Botan::SymmetricKey(rng, 32);
return session_ticket_key;
}
if(identity == "Client_identity")
return Botan::SymmetricKey("b5a72e1387552e6dc10766dc0eda12961f5b21e17f98ef4c41e6572e53bd7527");
if(identity == "lloyd")
return Botan::SymmetricKey("85b3c1b7dc62b507636ac767999c9630");
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, 1024));
else if(key_type == "dsa")
key.reset(new DSA_PrivateKey(rng, DL_Group("dsa/jce/1024")));
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-1", 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);
if(hostname == "nosuchname")
return std::vector<Botan::X509_Certificate>();
for(auto i : certs_and_keys)
{
if(hostname != "" && !i.first.matches_dns_name(hostname))
continue;
if(!value_exists(cert_key_types, i.second->algo_name()))
continue;
certs.push_back(i.first);
}
if(!certs.empty())
return certs;
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;
Botan::SymmetricKey session_ticket_key;
std::map<Botan::X509_Certificate, Botan::Private_Key*> certs_and_keys;
std::vector<Botan::Certificate_Store*> m_certstores;
};
#endif
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