TrustedPublisherServer.h

#pragma once
 
#include <test/jtx/envconfig.h>
 
#include <xrpl/basics/Slice.h>
#include <xrpl/basics/base64.h>
#include <xrpl/basics/chrono.h>
#include <xrpl/basics/random.h>
#include <xrpl/basics/strHex.h>
#include <xrpl/protocol/HashPrefix.h>
#include <xrpl/protocol/KeyType.h>
#include <xrpl/protocol/PublicKey.h>
#include <xrpl/protocol/SField.h>
#include <xrpl/protocol/STObject.h>
#include <xrpl/protocol/SecretKey.h>
#include <xrpl/protocol/Serializer.h>
#include <xrpl/protocol/Sign.h>
 
#include <boost/asio.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/ssl/stream.hpp>
#include <boost/beast/core/flat_buffer.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/ssl.hpp>
#include <boost/beast/version.hpp>
#include <boost/lexical_cast.hpp>
 
#include <chrono>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <exception>
#include <functional>
#include <limits>
#include <memory>
#include <optional>
#include <sstream>
#include <string>
#include <string_view>
#include <thread>
#include <utility>
#include <vector>
 
namespace xrpl::test {
 
class TrustedPublisherServer : public std::enable_shared_from_this<TrustedPublisherServer>
{
    using endpoint_type = boost::asio::ip::tcp::endpoint;
    using address_type = boost::asio::ip::address;
    using socket_type = boost::asio::ip::tcp::socket;
 
    using req_type = boost::beast::http::request<boost::beast::http::string_body>;
    using resp_type = boost::beast::http::response<boost::beast::http::string_body>;
    using error_code = boost::system::error_code;
 
    socket_type sock_;
    endpoint_type ep_;
    boost::asio::ip::tcp::acceptor acceptor_;
    // Generates a version 1 validator list, using the int parameter as the
    // actual version.
    std::function<std::string(int)> getList_;
    // Generates a version 2 validator list, using the int parameter as the
    // actual version.
    std::function<std::string(int)> getList2_;
 
    // The SSL context is required, and holds certificates
    bool useSSL_;
    boost::asio::ssl::context sslCtx_{boost::asio::ssl::context::tlsv12};
 
    SecretKey publisherSecret_;
    PublicKey publisherPublic_;
 
    // Load a signed certificate into the ssl context, and configure
    // the context for use with a server.
    void
    loadServerCertificate()
    {
        sslCtx_.set_password_callback(
            [](std::size_t, boost::asio::ssl::context_base::password_purpose) { return "test"; });
 
        sslCtx_.set_options(
            boost::asio::ssl::context::default_workarounds | boost::asio::ssl::context::no_sslv2 |
            boost::asio::ssl::context::single_dh_use);
 
        sslCtx_.use_certificate_chain(boost::asio::buffer(cert().data(), cert().size()));
 
        sslCtx_.use_private_key(
            boost::asio::buffer(key().data(), key().size()),
            boost::asio::ssl::context::file_format::pem);
 
        sslCtx_.use_tmp_dh(boost::asio::buffer(dh().data(), dh().size()));
    }
 
    struct BlobInfo
    {
        BlobInfo(std::string b, std::string s) : blob(std::move(b)), signature(std::move(s))
        {
        }
 
        // base-64 encoded JSON containing the validator list.
        std::string blob;
        // hex-encoded signature of the blob using the publisher's signing key
        std::string signature;
    };
 
public:
    struct Validator
    {
        PublicKey masterPublic;
        PublicKey signingPublic;
        std::string manifest;
    };
 
    static std::string
    makeManifestString(
        PublicKey const& pk,
        SecretKey const& sk,
        PublicKey const& spk,
        SecretKey const& ssk,
        int seq)
    {
        STObject st(sfGeneric);
        st[sfSequence] = seq;
        st[sfPublicKey] = pk;
        st[sfSigningPubKey] = spk;
 
        // NOLINTBEGIN(bugprone-unchecked-optional-access) publicKeyType returns value for valid
        // keys
        sign(st, HashPrefix::Manifest, *publicKeyType(spk), ssk);
        sign(st, HashPrefix::Manifest, *publicKeyType(pk), sk, sfMasterSignature);
        // NOLINTEND(bugprone-unchecked-optional-access)
 
        Serializer s;
        st.add(s);
 
        return base64Encode(std::string(static_cast<char const*>(s.data()), s.size()));
    }
 
    static Validator
    randomValidator()
    {
        auto const secret = randomSecretKey();
        auto const masterPublic = derivePublicKey(KeyType::Ed25519, secret);
        auto const signingKeys = randomKeyPair(KeyType::Secp256k1);
        return {
            .masterPublic = masterPublic,
            .signingPublic = signingKeys.first,
            .manifest =
                makeManifestString(masterPublic, secret, signingKeys.first, signingKeys.second, 1)};
    }
 
    // TrustedPublisherServer must be accessed through a shared_ptr.
    // This constructor is only public so std::make_shared has access.
    // The function `makeTrustedPublisherServer` should be used to create
    // instances.
    // The `futures` member is expected to be structured as
    // effective / expiration time point pairs for use in version 2 UNLs
    TrustedPublisherServer(
        boost::asio::io_context& ioc,
        std::vector<Validator> const& validators,
        NetClock::time_point validUntil,
        std::vector<std::pair<NetClock::time_point, NetClock::time_point>> const& futures,
        bool useSSL = false,
        int version = 1,
        bool immediateStart = true,
        int sequence = 1)
        : sock_{ioc}
        , ep_{boost::asio::ip::make_address(xrpl::test::getEnvLocalhostAddr()),
              // 0 means let OS pick the port based on what's available
              0}
        , acceptor_{ioc}
        , useSSL_{useSSL}
        , publisherSecret_{randomSecretKey()}
        , publisherPublic_{derivePublicKey(KeyType::Ed25519, publisherSecret_)}
    {
        auto const keys = randomKeyPair(KeyType::Secp256k1);
        auto const manifest =
            makeManifestString(publisherPublic_, publisherSecret_, keys.first, keys.second, 1);
 
        std::vector<BlobInfo> blobInfo;
        blobInfo.reserve(futures.size() + 1);
        auto const [data, blob] = [&]() -> std::pair<std::string, std::string> {
            // Builds the validator list, then encodes it into a blob.
            std::string data = "{\"sequence\":" + std::to_string(sequence) +
                ",\"expiration\":" + std::to_string(validUntil.time_since_epoch().count()) +
                ",\"validators\":[";
 
            for (auto const& val : validators)
            {
                data += R"({"validation_public_key":")" + strHex(val.masterPublic) +
                    R"(","manifest":")" + val.manifest + "\"},";
            }
            data.pop_back();
            data += "]}";
            std::string const blob = base64Encode(data);
            return std::make_pair(data, blob);
        }();
        auto const sig = strHex(sign(keys.first, keys.second, makeSlice(data)));
        blobInfo.emplace_back(blob, sig);
        getList_ = [blob = blob, sig, manifest, version](int interval) {
            // Build the contents of a version 1 format UNL file
            std::stringstream l;
            l << R"({"blob":")" << blob << "\"" << R"(,"signature":")" << sig << "\""
              << R"(,"manifest":")" << manifest << "\""
              << ",\"refresh_interval\": " << interval << ",\"version\":" << version << '}';
            return l.str();
        };
        for (auto const& future : futures)
        {
            std::string data = "{\"sequence\":" + std::to_string(++sequence) +
                ",\"effective\":" + std::to_string(future.first.time_since_epoch().count()) +
                ",\"expiration\":" + std::to_string(future.second.time_since_epoch().count()) +
                ",\"validators\":[";
 
            // Use the same set of validators for simplicity
            for (auto const& val : validators)
            {
                data += R"({"validation_public_key":")" + strHex(val.masterPublic) +
                    R"(","manifest":")" + val.manifest + "\"},";
            }
            data.pop_back();
            data += "]}";
            std::string const blob = base64Encode(data);
            auto const sig = strHex(sign(keys.first, keys.second, makeSlice(data)));
            blobInfo.emplace_back(blob, sig);
        }
        getList2_ = [blobInfo, manifest, version](int interval) {
            // Build the contents of a version 2 format UNL file
            // Use `version + 1` to get 2 for most tests, but have
            // a "bad" version number for tests that provide an override.
            std::stringstream l;
            for (auto const& info : blobInfo)
            {
                l << R"({"blob":")" << info.blob << "\"" << R"(,"signature":")" << info.signature
                  << "\"},";
            }
            std::string blobs = l.str();
            blobs.pop_back();
            l.str(std::string());
            l << "{\"blobs_v2\": [ " << blobs << R"(],"manifest":")" << manifest << "\""
              << ",\"refresh_interval\": " << interval << ",\"version\":" << (version + 1) << '}';
            return l.str();
        };
 
        if (useSSL_)
        {
            // This holds the self-signed certificate used by the server
            loadServerCertificate();
        }
    }
 
    void
    start()
    {
        error_code ec;
        acceptor_.open(ep_.protocol());
        acceptor_.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true), ec);
        acceptor_.bind(ep_);
        acceptor_.listen(boost::asio::socket_base::max_listen_connections);
        acceptor_.async_accept(
            sock_, [wp = std::weak_ptr<TrustedPublisherServer>{shared_from_this()}](error_code ec) {
                if (auto p = wp.lock())
                {
                    p->onAccept(ec);
                }
            });
    }
 
    void
    stop()
    {
        error_code ec;
        acceptor_.close(ec);
        // TODO: consider making this join
        // any running do_peer threads
    }
 
    ~TrustedPublisherServer()
    {
        stop();
    }
 
    endpoint_type
    localEndpoint() const
    {
        return acceptor_.local_endpoint();
    }
 
    PublicKey const&
    publisherPublic() const
    {
        return publisherPublic_;
    }
 
    /* CA/self-signed certs :
     *
     * The following three methods return certs/keys used by
     * server and/or client to do the SSL handshake. These strings
     * were generated using the script below. The server key and cert
     * are used to configure the server (see loadServerCertificate
     * above). The ca.crt should be used to configure the client
     * when ssl verification is enabled.
     *
     *    note:
     *        cert()    ==> server.crt
     *        key()     ==> server.key
     *        caCert() ==> ca.crt
     *        dh()      ==> dh.pem
     ```
        #!/usr/bin/env bash
 
        mkdir -p /tmp/__certs__
        pushd /tmp/__certs__
        rm *.crt *.key *.pem
 
        # generate CA
        openssl genrsa -out ca.key 2048
        openssl req -new -x509 -nodes -days 10000 -key ca.key -out ca.crt \
            -subj "/C=US/ST=CA/L=Los
     Angeles/O=xrpld-unit-tests/CN=example.com" # generate private cert
        openssl genrsa -out server.key 2048
        # Generate certificate signing request
        # since our unit tests can run in either ipv4 or ipv6 mode,
        # we need to use extensions (subjectAltName) so that we can
        # associate both ipv4 and ipv6 localhost addresses with this cert
        cat >"extras.cnf" <<EOF
        [req]
        req_extensions = v3_req
        distinguished_name = req_distinguished_name
 
        [req_distinguished_name]
 
        [v3_req]
        subjectAltName = @alt_names
 
        [alt_names]
        DNS.1 = localhost
        IP.1 = ::1
        EOF
        openssl req -new -key server.key -out server.csr \
            -config extras.cnf \
            -subj "/C=US/ST=California/L=San
     Francisco/O=xrpld-unit-tests/CN=127.0.0.1" \
 
        # Create public certificate by signing with our CA
        openssl x509 -req -days 10000 -in server.csr -CA ca.crt -CAkey ca.key
     -out server.crt \ -extfile extras.cnf -set_serial 01 -extensions v3_req
 
        # generate DH params for server
        openssl dhparam -out dh.pem 2048
        # verify certs
        openssl verify -CAfile ca.crt server.crt
        openssl x509 -in server.crt -text -noout
        popd
     ```
    */
    static std::string const&
    cert()
    {
        static std::string const kCert{R"cert(
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
)cert"};
        return kCert;
    }
 
    static std::string const&
    key()
    {
        static std::string const kKey{R"pkey(
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
)pkey"};
        return kKey;
    }
 
    static std::string const&
    caCert()
    {
        static std::string const kCert{R"cert(
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
)cert"};
        return kCert;
    }
 
    static std::string const&
    dh()
    {
        static std::string const kDH{R"dh(
-----BEGIN DH PARAMETERS-----
MIIBCAKCAQEAp2I2fWEUZ3sCNfitSRC/MdAhJE/bS+NO0O2tWdIdlvmIFE6B5qhC
sGW9ojrQT8DTxBvGAcbjr/jagmlE3BV4oSnxyhP37G2mDvMOJ29J3NvFD/ZFAW0d
BvZJ1RNvMu29NmVCyt6/jgzcqrqnami9uD93aK+zaVrlPsPEYM8xB19HXwqsEYCL
ux2B7sqXm9Ts74HPg/EV+pcVon9phxNWxxgHlOvFc2QjZ3hXH++kzmJ4vs7N/XDB
xbEQ+TUZ5jbJGSeBqNFKFeuOUQGJ46Io0jBSYd4rSmKUXkvElQwR+n7KF3jy1uAt
/8hzd8tHn9TyW7Q2/CPkOA6dCXzltpOSowIBAg==
-----END DH PARAMETERS-----
)dh"};
        return kDH;
    }
 
private:
    struct Lambda
    {
        int id;
        TrustedPublisherServer& self;
        socket_type sock;
        boost::asio::executor_work_guard<boost::asio::executor> work;
        bool ssl;
 
        Lambda(int id, TrustedPublisherServer& self, socket_type&& sock, bool ssl)
            : id(id), self(self), sock(std::move(sock)), work(this->sock.get_executor()), ssl(ssl)
        {
        }
 
        void
        operator()()
        {
            self.doPeer(id, std::move(sock), ssl);
        }
    };
 
    void
    onAccept(error_code ec)
    {
        if (ec || !acceptor_.is_open())
            return;
 
        static int nextId = 0;  // NOLINT(readability-identifier-naming)
        std::thread{Lambda{++nextId, *this, std::move(sock_), useSSL_}}.detach();
        acceptor_.async_accept(
            sock_, [wp = std::weak_ptr<TrustedPublisherServer>{shared_from_this()}](error_code ec) {
                if (auto p = wp.lock())
                {
                    p->onAccept(ec);
                }
            });
    }
 
    void
    doPeer(int id, socket_type&& s, bool ssl)
    {
        using namespace boost::beast;
        using namespace boost::asio;
        socket_type sock(std::move(s));
        flat_buffer sb;
        error_code ec;
        std::optional<ssl_stream<ip::tcp::socket&>> sslStream;
 
        if (ssl)
        {
            // Construct the stream around the socket
            sslStream.emplace(sock, sslCtx_);
            // Perform the SSL handshake
            sslStream->handshake(ssl::stream_base::server, ec);
            if (ec)
                return;
        }
 
        for (;;)
        {
            resp_type res;
            req_type req;
            try
            {
                if (ssl)
                {
                    http::read(
                        *sslStream, sb, req, ec);  // NOLINT(bugprone-unchecked-optional-access)
                                                   // ssl_stream emplaced when ssl==true
                }
                else
                {
                    http::read(sock, sb, req, ec);
                }
 
                if (ec)
                    break;
 
                std::string_view const path = req.target();
                res.insert("Server", "TrustedPublisherServer");
                res.version(req.version());
                res.keep_alive(req.keep_alive());
                bool prepare = true;
 
                if (path.starts_with("/validators2"))
                {
                    res.result(http::status::ok);
                    res.insert("Content-Type", "application/json");
                    if (path == "/validators2/bad")
                    {
                        res.body() = "{ 'bad': \"2']";
                    }
                    else if (path == "/validators2/missing")
                    {
                        res.body() = "{\"version\": 2}";
                    }
                    else
                    {
                        int refresh = 5;
                        static constexpr char const* kRefreshPrefix = "/validators2/refresh/";
                        if (path.starts_with(kRefreshPrefix))
                        {
                            refresh = boost::lexical_cast<unsigned int>(
                                path.substr(strlen(kRefreshPrefix)));
                        }
                        res.body() = getList2_(refresh);
                    }
                }
                else if (path.starts_with("/validators"))
                {
                    res.result(http::status::ok);
                    res.insert("Content-Type", "application/json");
                    if (path == "/validators/bad")
                    {
                        res.body() = "{ 'bad': \"1']";
                    }
                    else if (path == "/validators/missing")
                    {
                        res.body() = "{\"version\": 1}";
                    }
                    else
                    {
                        int refresh = 5;
                        static constexpr char const* kRefreshPrefix = "/validators/refresh/";
                        if (path.starts_with(kRefreshPrefix))
                        {
                            refresh = boost::lexical_cast<unsigned int>(
                                path.substr(strlen(kRefreshPrefix)));
                        }
                        res.body() = getList_(refresh);
                    }
                }
                else if (path.starts_with("/textfile"))
                {
                    prepare = false;
                    res.result(http::status::ok);
                    res.insert("Content-Type", "text/example");
                    // if huge was requested, lie about content length
                    std::uint64_t const cl = path.starts_with("/textfile/huge")
                        ? std::numeric_limits<uint64_t>::max()
                        : 1024;
                    res.content_length(cl);
                    if (req.method() == http::verb::get)
                    {
                        std::stringstream body;
                        for (auto i = 0; i < 1024; ++i)
                        {
                            body << static_cast<char>(randInt<short>(32, 126)),
                                res.body() = body.str();
                        }
                    }
                }
                else if (path.starts_with("/sleep/"))
                {
                    auto const sleepSec = boost::lexical_cast<unsigned int>(path.substr(7));
                    std::this_thread::sleep_for(std::chrono::seconds(sleepSec));
                }
                else if (path.starts_with("/redirect"))
                {
                    if (path.ends_with("/301"))
                    {
                        res.result(http::status::moved_permanently);
                    }
                    else if (path.ends_with("/302"))
                    {
                        res.result(http::status::found);
                    }
                    else if (path.ends_with("/307"))
                    {
                        res.result(http::status::temporary_redirect);
                    }
                    else if (path.ends_with("/308"))
                    {
                        res.result(http::status::permanent_redirect);
                    }
 
                    std::stringstream location;
                    if (path.starts_with("/redirect_to/"))
                    {
                        location << path.substr(13);
                    }
                    else if (!path.starts_with("/redirect_nolo"))
                    {
                        location << (ssl ? "https://" : "http://") << localEndpoint()
                                 << (path.starts_with("/redirect_forever/") ? path : "/validators");
                    }
                    if (!location.str().empty())
                        res.insert("Location", location.str());
                }
                else
                {
                    // unknown request
                    res.result(boost::beast::http::status::not_found);
                    res.insert("Content-Type", "text/html");
                    res.body() = "The file '" + std::string(path) +
                        "' was not "
                        "found";
                }
 
                if (prepare)
                    res.prepare_payload();
            }
            catch (std::exception const& e)
            {
                res = {};
                res.result(boost::beast::http::status::internal_server_error);
                res.version(req.version());
                res.insert("Server", "TrustedPublisherServer");
                res.insert("Content-Type", "text/html");
                res.body() = std::string{"An internal error occurred"} + e.what();
                res.prepare_payload();
            }
 
            if (ssl)
            {
                write(*sslStream, res, ec);  // NOLINT(bugprone-unchecked-optional-access)
                                             // ssl_stream emplaced when ssl==true
            }
            else
            {
                write(sock, res, ec);
            }
 
            if (ec || req.need_eof())
                break;
        }
 
        // Perform the SSL shutdown
        if (ssl)
            sslStream->shutdown(ec);  // NOLINT(bugprone-unchecked-optional-access) ssl_stream
                                      // emplaced when ssl==true
    }
};
 
inline std::shared_ptr<TrustedPublisherServer>
makeTrustedPublisherServer(
    boost::asio::io_context& ioc,
    std::vector<TrustedPublisherServer::Validator> const& validators,
    NetClock::time_point validUntil,
    std::vector<std::pair<NetClock::time_point, NetClock::time_point>> const& futures,
    bool useSSL = false,
    int version = 1,
    bool immediateStart = true,
    int sequence = 1)
{
    auto const r = std::make_shared<TrustedPublisherServer>(
        ioc, validators, validUntil, futures, useSSL, version, sequence);
    if (immediateStart)
        r->start();
    return r;
}
 
}  // namespace xrpl::test