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// 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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