From e18d36ebae30536c77c61cd5da123991e0ca1629 Mon Sep 17 00:00:00 2001
From: Rasmus Dahlberg <rasmus@rgdd.se>
Date: Sun, 31 Dec 2023 09:39:25 +0100
Subject: Add drafty prototype

---
 pkg/storage/storage.go | 155 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 pkg/storage/storage.go

(limited to 'pkg/storage/storage.go')

diff --git a/pkg/storage/storage.go b/pkg/storage/storage.go
new file mode 100644
index 0000000..5e28aca
--- /dev/null
+++ b/pkg/storage/storage.go
@@ -0,0 +1,155 @@
+// Package storage manages an index of certificates, a dynamically updated log
+// list, and a monitor's state on the local file system in a single directory.
+package storage
+
+import (
+	"context"
+	"crypto/sha256"
+	"crypto/x509"
+	"fmt"
+	"net/http"
+	"path/filepath"
+	"time"
+
+	"github.com/google/certificate-transparency-go/client"
+	"github.com/google/certificate-transparency-go/jsonclient"
+	"gitlab.torproject.org/rgdd/ct/pkg/metadata"
+	"rgdd.se/silent-ct/internal/ioutil"
+	"rgdd.se/silent-ct/internal/monitor"
+	"rgdd.se/silent-ct/pkg/storage/index"
+	"rgdd.se/silent-ct/pkg/storage/loglist"
+)
+
+type Config struct {
+	Bootstrap bool   // Whether a new storage should be bootstrapped in a non-existing directory
+	Directory string // Path to a directory where everything will be stored
+
+	// Optional
+	AlertDelay  time.Duration     // Time before alerting on certificates that are unaccounted for
+	StaticLogs  []metadata.Log    // Static logs to configure in loglist
+	RemoveLogs  []metadata.LogKey // Keys of logs to omit in loglist
+	HTTPTimeout time.Duration     // HTTP timeout used when bootstrapping logs
+}
+
+func (cfg *Config) CertificateIndexFile() string           { return cfg.Directory + "/crt_index.json" }
+func (cfg *Config) LegitimateCertificateDirectory() string { return cfg.Directory + "/crt_trusted" }
+func (cfg *Config) DiscoveredCertificateDirectory() string { return cfg.Directory + "/crt_found" }
+func (cfg *Config) MetadataFile() string                   { return cfg.Directory + "/metadata.json" }
+func (cfg *Config) MetadataHistoryDirectory() string       { return cfg.Directory + "/metadata_history" }
+func (cfg *Config) MonitorStateDirectory() string          { return cfg.Directory + "/monitor_state" }
+func (cfg *Config) MonitorStateFile(logID [sha256.Size]byte) string {
+	return fmt.Sprintf("%s/%x.json", cfg.MonitorStateDirectory(), logID[:])
+}
+
+func (cfg *Config) directories() []string {
+	return []string{
+		cfg.Directory,
+		cfg.LegitimateCertificateDirectory(),
+		cfg.DiscoveredCertificateDirectory(),
+		cfg.MetadataHistoryDirectory(),
+		cfg.MonitorStateDirectory(),
+	}
+}
+
+func (cfg *Config) configure() error {
+	if cfg.Directory == "" {
+		return fmt.Errorf("directory is required")
+	}
+	if cfg.HTTPTimeout == 0 {
+		cfg.HTTPTimeout = 10 * time.Second
+	}
+
+	path, err := filepath.Abs(cfg.Directory)
+	if err != nil {
+		return err
+	}
+	cfg.Directory = path
+	if err := ioutil.DirectoriesExist(cfg.directories()); err != nil {
+		if !cfg.Bootstrap {
+			return err
+		}
+		return ioutil.CreateDirectories(cfg.directories())
+	}
+	return nil
+}
+
+type Storage struct {
+	Config
+	index.Index
+	loglist.LogList
+}
+
+func New(cfg Config) (Storage, error) {
+	err := cfg.configure()
+	if err != nil {
+		return Storage{}, err
+	}
+
+	s := Storage{Config: cfg}
+	if s.Index, err = index.New(index.Config{
+		PermitBootstrap: cfg.Bootstrap,
+		IndexFile:       cfg.CertificateIndexFile(),
+		TrustDirectory:  cfg.LegitimateCertificateDirectory(),
+		MatchDirectory:  cfg.DiscoveredCertificateDirectory(),
+		AlertDelay:      cfg.AlertDelay,
+	}); err != nil {
+		return Storage{}, err
+	}
+
+	if s.LogList, err = loglist.New(loglist.Config{
+		PermitBootstrap:  cfg.Bootstrap,
+		MetadataFile:     cfg.MetadataFile(),
+		HistoryDirectory: cfg.MetadataHistoryDirectory(),
+		StaticLogs:       cfg.StaticLogs,
+		RemoveLogs:       cfg.RemoveLogs,
+	}); err != nil {
+		return Storage{}, err
+	}
+
+	return s, err
+}
+
+func (s *Storage) BootstrapLog(ctx context.Context, log metadata.Log, skipBacklog bool) (monitor.State, error) {
+	storedState, err := s.GetMonitorState(log)
+	if err == nil {
+		return storedState, ErrorMonitorStateExists
+	}
+
+	key, err := x509.MarshalPKIXPublicKey(log.Key.Public)
+	if err != nil {
+		return monitor.State{}, err
+	}
+	cli, err := client.New(string(log.URL), &http.Client{}, jsonclient.Options{PublicKeyDER: key})
+	if err != nil {
+		return monitor.State{}, err
+	}
+
+	sctx, cancel := context.WithTimeout(ctx, s.Config.HTTPTimeout)
+	defer cancel()
+	sth, err := cli.GetSTH(sctx)
+	if err != nil {
+		return monitor.State{}, err
+	}
+	id, _ := log.Key.ID()
+	sth.LogID = id
+
+	state := monitor.State{SignedTreeHead: *sth}
+	if skipBacklog {
+		state.NextIndex = sth.TreeSize
+	}
+	return state, s.SetMonitorState(id, state)
+}
+
+func (s *Storage) SetMonitorState(logID [sha256.Size]byte, state monitor.State) error {
+	return ioutil.CommitJSON(s.MonitorStateFile(logID), state)
+}
+
+func (s *Storage) GetMonitorState(log metadata.Log) (monitor.State, error) {
+	id, err := log.Key.ID()
+	if err != nil {
+		return monitor.State{}, err
+	}
+
+	state := monitor.State{}
+	return state, ioutil.ReadJSON(s.MonitorStateFile(id), &state)
+}
-- 
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