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/*
* (C) 2014,2015,2019 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_CLI_TLS_HELPERS_H_
#define BOTAN_CLI_TLS_HELPERS_H_
#include <botan/pkcs8.h>
#include <botan/credentials_manager.h>
#include <botan/tls_policy.h>
#include <botan/x509self.h>
#include <botan/data_src.h>
#include <memory>
#include <fstream>
#include "cli_exceptions.h"
#if defined(BOTAN_HAS_CERTSTOR_SYSTEM)
#include <botan/certstor_system.h>
#endif
inline 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 Basic_Credentials_Manager : public Botan::Credentials_Manager
{
public:
Basic_Credentials_Manager(bool use_system_store,
const std::string& ca_path)
{
if(ca_path.empty() == false)
{
m_certstores.push_back(std::make_shared<Botan::Certificate_Store_In_Memory>(ca_path));
}
#if defined(BOTAN_HAS_CERTSTOR_SYSTEM)
if(use_system_store)
{
m_certstores.push_back(std::make_shared<Botan::System_Certificate_Store>());
}
#else
BOTAN_UNUSED(use_system_store);
#endif
}
Basic_Credentials_Manager(const std::string& server_crt,
const std::string& server_key)
{
Certificate_Info cert;
Botan::DataSource_Stream key_in(server_key);
cert.key = Botan::PKCS8::load_key(key_in);
Botan::DataSource_Stream in(server_crt);
while(!in.end_of_data())
{
try
{
cert.certs.push_back(Botan::X509_Certificate(in));
}
catch(std::exception&)
{
}
}
// TODO: attempt to validate chain ourselves
m_creds.push_back(cert);
}
std::vector<Botan::Certificate_Store*>
trusted_certificate_authorities(const std::string& type,
const std::string& /*hostname*/) override
{
std::vector<Botan::Certificate_Store*> v;
// don't ask for client certs
if(type == "tls-server")
{
return v;
}
for(auto const& cs : m_certstores)
{
v.push_back(cs.get());
}
return v;
}
std::vector<Botan::X509_Certificate> cert_chain(
const std::vector<std::string>& algos,
const std::string& type,
const std::string& hostname) override
{
BOTAN_UNUSED(type);
for(auto const& i : m_creds)
{
if(std::find(algos.begin(), algos.end(), i.key->algo_name()) == algos.end())
{
continue;
}
if(hostname != "" && !i.certs[0].matches_dns_name(hostname))
{
continue;
}
return i.certs;
}
return std::vector<Botan::X509_Certificate>();
}
Botan::Private_Key* private_key_for(const Botan::X509_Certificate& cert,
const std::string& /*type*/,
const std::string& /*context*/) override
{
for(auto const& i : m_creds)
{
if(cert == i.certs[0])
{
return i.key.get();
}
}
return nullptr;
}
private:
struct Certificate_Info
{
std::vector<Botan::X509_Certificate> certs;
std::shared_ptr<Botan::Private_Key> key;
};
std::vector<Certificate_Info> m_creds;
std::vector<std::shared_ptr<Botan::Certificate_Store>> m_certstores;
};
class TLS_All_Policy final : public Botan::TLS::Policy
{
public:
std::vector<std::string> allowed_ciphers() const override
{
return std::vector<std::string>
{
"ChaCha20Poly1305",
"AES-256/OCB(12)",
"AES-128/OCB(12)",
"AES-256/GCM",
"AES-128/GCM",
"AES-256/CCM",
"AES-128/CCM",
"AES-256/CCM(8)",
"AES-128/CCM(8)",
"Camellia-256/GCM",
"Camellia-128/GCM",
"ARIA-256/GCM",
"ARIA-128/GCM",
"AES-256",
"AES-128",
"Camellia-256",
"Camellia-128",
"SEED"
"3DES"
};
}
std::vector<std::string> allowed_key_exchange_methods() const override
{
return { "ECDHE_PSK", "DHE_PSK", "PSK", "CECPQ1", "ECDH", "DH", "RSA" };
}
std::vector<std::string> allowed_signature_methods() const override
{
return { "ECDSA", "RSA", "DSA", "IMPLICIT" };
}
bool allow_tls10() const override { return true; }
bool allow_tls11() const override { return true; }
bool allow_tls12() const override { return true; }
};
inline std::unique_ptr<Botan::TLS::Policy> load_tls_policy(const std::string policy_type)
{
std::unique_ptr<Botan::TLS::Policy> policy;
if(policy_type == "default" || policy_type == "")
{
policy.reset(new Botan::TLS::Policy);
}
else if(policy_type == "suiteb_128")
{
policy.reset(new Botan::TLS::NSA_Suite_B_128);
}
else if(policy_type == "suiteb_192" || policy_type == "suiteb")
{
policy.reset(new Botan::TLS::NSA_Suite_B_192);
}
else if(policy_type == "strict")
{
policy.reset(new Botan::TLS::Strict_Policy);
}
else if(policy_type == "bsi")
{
policy.reset(new Botan::TLS::BSI_TR_02102_2);
}
else if(policy_type == "datagram")
{
policy.reset(new Botan::TLS::Strict_Policy);
}
else if(policy_type == "all" || policy_type == "everything")
{
policy.reset(new TLS_All_Policy);
}
else
{
// assume it's a file
std::ifstream policy_stream(policy_type);
if(!policy_stream.good())
{
throw Botan_CLI::CLI_Usage_Error("Unknown TLS policy: not a file or known short name");
}
policy.reset(new Botan::TLS::Text_Policy(policy_stream));
}
return policy;
}
#endif
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