/*

* (C) 2015,2016 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include "fuzzers.h"

#include <botan/tls_server.h>

#include <botan/data_src.h>

const char* fixed_rsa_key =

   "-----BEGIN PRIVATE KEY-----\n"

   "MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCe6qqpMQVJ7zCJ\n"

   "oSnpxia0yO6M7Ie3FGqPcd0DzueC+kWPvuHQ+PpP5vfO6qqRaDVII37PFX5NUZQm\n"

   "GK/rAm7spjIHTCMgqSZ8pN13LU8m1gDwIdu9al16LXN9zZjB67uLlFn2trtLi234\n"

   "i0cnyeF8IC0cz7tgCOzMSVEBcqJjkdgGrZ3WUgOXecVm2lXVrYlEiaSxFp4VOE9k\n"

   "RFeVrELCjmNtc4hRd1yJsF+vObCtvyqGYQE1Qcb0MVSQDBHMkiUVmO6zuW7td5ef\n"

   "O/1OyntQJGyVa+SnWbkSLCybta2J7MreHENrF5GA0K1KL140SNRHeWifRMuNQua7\n"

   "qmKXMBTFAgMBAAECggEAIk3fxyQI0zvpy1vZ01ft1QqmzA7nAPNMSWi33/GS8iga\n"

   "SfxXfKeySPs/tQ/dAARxs//NiOBH4mLgyxR7LQzaawU5OXALCSraXv+ruuUx990s\n"

   "WKnGaG4EfbJAAwEVn47Gbkv425P4fEc91vAhzQn8PbIoatbAyOtESpjs/pYDTeC/\n"

   "mnJId8gqO90cqyRECEMjk9sQ8iEjWPlik4ayGlUVbeeMu6/pJ9F8IZEgkLZiNDAB\n"

   "4anmOFaT7EmqUjI4IlcaqfbbXyDXlvWUYukidEss+CNvPuqbQHBDnpFVvBxdDR2N\n"

   "Uj2D5Xd5blcIe2/+1IVRnznjoQ5zvutzb7ThBmMehQKBgQDOITKG0ht2kXLxjVoR\n"

   "r/pVpx+f3hs3H7wE0+vrLHoQgkVjpMWXQ47YuZTT9rCOOYNI2cMoH2D27t1j78/B\n"

   "9kGYABUVpvQQ+6amqJDI1eYI6e68TPueEDjeALfSCdmPNiI3lZZrCIK9XLpkoy8K\n"

   "tGYBRRJ+JJxjj1zPXj9SGshPgwKBgQDFXUtoxY3mCStH3+0b1qxGG9r1L5goHEmd\n"

   "Am8WBYDheNpL0VqPNzouhuM/ZWMGyyAs/py6aLATe+qhR1uX5vn7LVZwjCSONZ4j\n"

   "7ieEEUh1BHetPI1oI5PxgokRYfVuckotqVseanI/536Er3Yf2FXNQ1/ceVp9WykX\n"

   "3mYTKMhQFwKBgQDKakcXpZNaZ5IcKdZcsBZ/rdGcR5sqEnursf9lvRNQytwg8Vkn\n"

   "JSxNHlBLpV/TCh8lltHRwJ6TXhUBYij+KzhWbx5FWOErHDOWTMmArqtp7W6GcoJT\n"

   "wVJWjxXzp8CApYQMWVSQXpckJL7UvHohZO0WKiHyxTjde5aD++TqV2qEyQKBgBbD\n"

   "jvoTpy08K4DLxCZs2Uvw1I1pIuylbpwsdrGciuP2s38BM6fHH+/T4Qwj3osfDKQD\n"

   "7gHWJ1Dn/wUBHQBlRLoC3bB3iZPZfVb5lhc2gxv0GvWhQVIcoGi/vJ2DpfJKPmIL\n"

   "4ZWdg3X5dm9JaZ98rVDSj5D3ckd5J0E4hp95GbmbAoGBAJJHM4O9lx60tIjw9Sf/\n"

   "QmKWyUk0NLnt8DcgRMW7fVxtzPNDy9DBKGIkDdWZ2s+ForICA3C9WSxBC1EOEHGG\n"

   "xkg2xKt66CeutGroP6M191mHQrRClt1VbEYzQFX21BCk5kig9i/BURyoTHtFiV+t\n"

   "kbf4VLg8Vk9u/R3RU1HsYWhe\n"

   "-----END PRIVATE KEY-----\n";

const char* fixed_rsa_cert =

   "-----BEGIN CERTIFICATE-----\n"

   "MIIDUDCCAjgCCQD7pIb1ZsoafjANBgkqhkiG9w0BAQsFADBqMQswCQYDVQQGEwJW\n"

   "VDEQMA4GA1UECAwHVmVybW9udDEWMBQGA1UEBwwNVGhlIEludGVybmV0czEUMBIG\n"

   "A1UECgwLTWFuZ29zIFIgVXMxGzAZBgNVBAMMEnNlcnZlci5leGFtcGxlLmNvbTAe\n"

   "Fw0xNjAxMDYxNzQ3MjNaFw0yNjAxMDMxNzQ3MjNaMGoxCzAJBgNVBAYTAlZUMRAw\n"

   "DgYDVQQIDAdWZXJtb250MRYwFAYDVQQHDA1UaGUgSW50ZXJuZXRzMRQwEgYDVQQK\n"

   "DAtNYW5nb3MgUiBVczEbMBkGA1UEAwwSc2VydmVyLmV4YW1wbGUuY29tMIIBIjAN\n"

   "BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAnuqqqTEFSe8wiaEp6cYmtMjujOyH\n"

   "txRqj3HdA87ngvpFj77h0Pj6T+b3zuqqkWg1SCN+zxV+TVGUJhiv6wJu7KYyB0wj\n"

   "IKkmfKTddy1PJtYA8CHbvWpdei1zfc2Yweu7i5RZ9ra7S4tt+ItHJ8nhfCAtHM+7\n"

   "YAjszElRAXKiY5HYBq2d1lIDl3nFZtpV1a2JRImksRaeFThPZERXlaxCwo5jbXOI\n"

   "UXdcibBfrzmwrb8qhmEBNUHG9DFUkAwRzJIlFZjus7lu7XeXnzv9Tsp7UCRslWvk\n"

   "p1m5Eiwsm7WtiezK3hxDaxeRgNCtSi9eNEjUR3lon0TLjULmu6pilzAUxQIDAQAB\n"

   "MA0GCSqGSIb3DQEBCwUAA4IBAQA1eZGc/4V7z/E/6eG0hVkzoAZeuTcSP7WqBSx+\n"

   "OP2yh0163UYjoa6nehmkKYQQ9PbYPZGzIcl+dBFyYzy6jcp0NdtzpWnTFrjl4rMq\n"

   "akcQ1D0LTYjJXVP9G/vF/SvatOFeVTnQmLlLt/a8ZtRUINqejeZZPzH8ifzFW6tu\n"

   "mlhTVIEKyPHpxClh5Y3ubw/mZYygekFTqMkTx3FwJxKU8J6rYGZxanWAODUIvCUo\n"

   "Fxer1qC5Love3uWl3vXPLEZWZdORnExSRByzz2immBP2vX4zYZoeZRhTQ9ae1TIV\n"

   "Dk02a/1AOJZdZReDbgXhlqaUx5pk/rzo4mDzvu5HSCeXmClz\n"

   "-----END CERTIFICATE-----\n";

class Fuzzer_TLS_Server_Creds : public Botan::Credentials_Manager

   {

   public:

      Fuzzer_TLS_Server_Creds()

         {

         Botan::DataSource_Memory cert_in(fixed_rsa_cert);

         Botan::DataSource_Memory key_in(fixed_rsa_key);

         m_rsa_cert.reset(new Botan::X509_Certificate(cert_in));

         //m_rsa_key.reset(Botan::PKCS8::load_key(key_in, fuzzer_rng());

         }

      std::vector<Botan::X509_Certificate> cert_chain(

         const std::vector<std::string>& algos,

         const std::string& /*type*/,

         const std::string& /*hostname*/) override

         {

         std::vector<Botan::X509_Certificate> v;

         for(auto algo : algos)

            {

            if(algo == "RSA")

               {

               v.push_back(*m_rsa_cert);

               break;

               }

            }

         return v;

         }

      Botan::Private_Key* private_key_for(const Botan::X509_Certificate& /*cert*/,

                                          const std::string& /*type*/,

                                          const std::string& /*context*/) override

         {

         return m_rsa_key.get();

         }

      std::string psk_identity_hint(const std::string&, const std::string&) override { return "psk_hint"; }

      std::string psk_identity(const std::string&, const std::string&, const std::string&) override { return "psk_id"; }

      Botan::SymmetricKey psk(const std::string&, const std::string&, const std::string&) override

         {

         return Botan::SymmetricKey("AABBCCDDEEFF00112233445566778899");

         }

   private:

      std::unique_ptr<Botan::X509_Certificate> m_rsa_cert;

      std::unique_ptr<Botan::Private_Key> m_rsa_key;

   };

class Fuzzer_TLS_Policy : public Botan::TLS::Policy

   {

   public:

      std::vector<uint16_t> ciphersuite_list(Botan::TLS::Protocol_Version version,

                                             bool have_srp) const

         {

         std::vector<uint16_t> ciphersuites;

         for(auto&& suite : Botan::TLS::Ciphersuite::all_known_ciphersuites())

            {

            if(suite.valid() == false)

               continue;

            // Are we doing SRP?

            if(!have_srp && suite.kex_method() == Botan::TLS::Kex_Algo::SRP_SHA)

               continue;

            if(!version.supports_aead_modes())

               {

               // Are we doing AEAD in a non-AEAD version?

               if(suite.mac_algo() == "AEAD")

                  continue;

               // Older (v1.0/v1.1) versions also do not support any hash but SHA-1

               if(suite.mac_algo() != "SHA-1")

                  continue;

               }

            ciphersuites.push_back(suite.ciphersuite_code());

            }

         return ciphersuites;

         }

   };

class Fuzzer_TLS_Server_Callbacks : public Botan::TLS::Callbacks

   {

   public:

       void tls_emit_data(const uint8_t[], size_t) override

         {

         // discard

         }

      void tls_record_received(uint64_t, const uint8_t[], size_t) override

         {

         // ignore peer data

         }

      void tls_alert(Botan::TLS::Alert) override

         {

         // ignore alert

         }

      bool tls_session_established(const Botan::TLS::Session&) override

         {

         return true; // cache it

         }

      std::string tls_server_choose_app_protocol(const std::vector<std::string>& client_protos) override

         {

         if(client_protos.size() > 1)

            return client_protos[0];

         else

            return "fuzzy";

         }

      void tls_verify_cert_chain(

         const std::vector<Botan::X509_Certificate>& cert_chain,

         const std::vector<std::shared_ptr<const Botan::OCSP::Response>>& ocsp_responses,

         const std::vector<Botan::Certificate_Store*>& trusted_roots,

         Botan::Usage_Type usage,

         const std::string& hostname,

         const Botan::TLS::Policy& policy) override

         {

         try

            {

            // try to validate to exercise those code paths

            Botan::TLS::Callbacks::tls_verify_cert_chain(cert_chain, ocsp_responses,

                                                         trusted_roots, usage, hostname, policy);

            }

         catch(...)

            {

            // ignore validation result

            }

         }

   };

void fuzz(const uint8_t in[], size_t len)

   {

   if(len <= 1)

      return;

   Botan::TLS::Session_Manager_Noop session_manager;

   Fuzzer_TLS_Policy policy;

   Botan::TLS::Server_Information info("server.name", 443);

   Fuzzer_TLS_Server_Creds creds;

   Fuzzer_TLS_Server_Callbacks callbacks;

   const bool is_datagram = in[0] & 1;

   Botan::TLS::Server server(callbacks,

                             session_manager,

                             creds,

                             policy,

                             fuzzer_rng(),

                             is_datagram);

   try

      {

      server.received_data(in + 1, len - 1);

      }

   catch(std::exception& e)

      {

      }

   }