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|
// Package main provides a sigsum-log-go binary
package main
import (
"context"
"crypto"
"crypto/ed25519"
"encoding/hex"
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"os/signal"
"strings"
"sync"
"syscall"
"time"
"github.com/google/trillian"
"github.com/prometheus/client_golang/prometheus/promhttp"
"google.golang.org/grpc"
"git.sigsum.org/sigsum-go/pkg/log"
"git.sigsum.org/sigsum-go/pkg/merkle"
"git.sigsum.org/sigsum-go/pkg/types"
"git.sigsum.org/sigsum-go/pkg/dns"
"git.sigsum.org/log-go/pkg/db"
"git.sigsum.org/log-go/pkg/instance"
"git.sigsum.org/log-go/pkg/state"
)
var (
httpEndpoint = flag.String("http_endpoint", "localhost:6965", "host:port specification of where sigsum-log-go serves clients")
rpcBackend = flag.String("log_rpc_server", "localhost:6962", "host:port specification of where Trillian serves clients")
prefix = flag.String("prefix", "", "a prefix that proceeds /sigsum/v0/<endpoint>")
trillianID = flag.Int64("trillian_id", 0, "log identifier in the Trillian database")
deadline = flag.Duration("deadline", time.Second*10, "deadline for backend requests")
key = flag.String("key", "", "path to file with hex-encoded Ed25519 private key")
witnesses = flag.String("witnesses", "", "comma-separated list of trusted witness public keys in hex")
maxRange = flag.Int64("max_range", 10, "maximum number of entries that can be retrived in a single request")
interval = flag.Duration("interval", time.Second*30, "interval used to rotate the log's cosigned STH")
shardStart = flag.Int64("shard_interval_start", 0, "start of shard interval since the UNIX epoch in seconds")
logFile = flag.String("log-file", "", "file to write logs to (Default: stderr)")
logLevel = flag.String("log-level", "info", "log level (Available options: debug, info, warning, error. Default: info)")
logColor = flag.Bool("log-color", false, "colored logging output (Default: off)")
gitCommit = "unknown"
)
func main() {
flag.Parse()
if err := setupLogging(*logFile, *logLevel, *logColor); err != nil {
log.Fatal("setup logging: %v", err)
}
log.Info("log-go git-commit %s", gitCommit)
// wait for clean-up before exit
var wg sync.WaitGroup
defer wg.Wait()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
log.Debug("configuring log-go instance")
instance, err := setupInstanceFromFlags()
if err != nil {
log.Fatal("setup instance: %v", err)
}
log.Debug("starting state manager routine")
go func() {
wg.Add(1)
defer wg.Done()
instance.Stateman.Run(ctx)
log.Debug("state manager shutdown")
cancel() // must have state manager running
}()
log.Debug("starting await routine")
server := http.Server{Addr: *httpEndpoint}
go await(ctx, func() {
wg.Add(1)
defer wg.Done()
ctxInner, _ := context.WithTimeout(ctx, time.Second*60)
log.Info("stopping http server, please wait...")
server.Shutdown(ctxInner)
log.Info("stopping go routines, please wait...")
cancel()
})
log.Info("serving on %v/%v", *httpEndpoint, *prefix)
if err = server.ListenAndServe(); err != http.ErrServerClosed {
log.Error("serve: %v", err)
}
}
func setupLogging(logFile, logLevel string, logColor bool) error {
if len(logFile) != 0 {
f, err := os.OpenFile(logFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return err
}
log.SetOutput(f)
}
switch logLevel {
case "debug":
log.SetLevel(log.DebugLevel)
case "info":
log.SetLevel(log.InfoLevel)
case "warning":
log.SetLevel(log.WarningLevel)
case "error":
log.SetLevel(log.ErrorLevel)
default:
return fmt.Errorf("invalid logging level %s", logLevel)
}
log.SetColor(logColor)
return nil
}
// SetupInstance sets up a new sigsum-log-go instance from flags
func setupInstanceFromFlags() (*instance.Instance, error) {
var i instance.Instance
var err error
// Setup log configuration
i.Signer, i.LogID, err = newLogIdentity(*key)
if err != nil {
return nil, fmt.Errorf("newLogIdentity: %v", err)
}
i.TreeID = *trillianID
i.Prefix = *prefix
i.MaxRange = *maxRange
i.Deadline = *deadline
i.Interval = *interval
i.ShardStart = uint64(*shardStart)
if *shardStart < 0 {
return nil, fmt.Errorf("shard start must be larger than zero")
}
i.Witnesses, err = newWitnessMap(*witnesses)
if err != nil {
return nil, fmt.Errorf("newWitnessMap: %v", err)
}
// Setup log client
dialOpts := []grpc.DialOption{grpc.WithInsecure(), grpc.WithBlock(), grpc.WithTimeout(i.Deadline)}
conn, err := grpc.Dial(*rpcBackend, dialOpts...)
if err != nil {
return nil, fmt.Errorf("Dial: %v", err)
}
i.Client = &db.TrillianClient{
TreeID: i.TreeID,
GRPC: trillian.NewTrillianLogClient(conn),
}
// Setup state manager
i.Stateman, err = state.NewStateManagerSingle(i.Client, i.Signer, i.Interval, i.Deadline)
if err != nil {
return nil, fmt.Errorf("NewStateManagerSingle: %v", err)
}
// Setup DNS verifier
i.DNS = dns.NewDefaultResolver()
// Register HTTP endpoints
mux := http.NewServeMux()
http.Handle("/", mux)
for _, handler := range i.Handlers() {
log.Debug("adding handler: %s", handler.Path())
mux.Handle(handler.Path(), handler)
}
log.Debug("adding prometheus handler on path: /metrics")
http.Handle("/metrics", promhttp.Handler())
return &i, nil
}
func newLogIdentity(keyFile string) (crypto.Signer, string, error) {
buf, err := ioutil.ReadFile(keyFile)
if err != nil {
return nil, "", err
}
if buf, err = hex.DecodeString(strings.TrimSpace(string(buf))); err != nil {
return nil, "", fmt.Errorf("DecodeString: %v", err)
}
sk := crypto.Signer(ed25519.PrivateKey(buf))
vk := sk.Public().(ed25519.PublicKey)
return sk, hex.EncodeToString([]byte(vk[:])), nil
}
// newWitnessMap creates a new map of trusted witnesses
func newWitnessMap(witnesses string) (map[merkle.Hash]types.PublicKey, error) {
w := make(map[merkle.Hash]types.PublicKey)
if len(witnesses) > 0 {
for _, witness := range strings.Split(witnesses, ",") {
b, err := hex.DecodeString(witness)
if err != nil {
return nil, fmt.Errorf("DecodeString: %v", err)
}
var vk types.PublicKey
if n := copy(vk[:], b); n != types.PublicKeySize {
return nil, fmt.Errorf("Invalid public key size: %v", n)
}
w[*merkle.HashFn(vk[:])] = vk
}
}
return w, nil
}
// await waits for a shutdown signal and then runs a clean-up function
func await(ctx context.Context, done func()) {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
select {
case <-sigs:
case <-ctx.Done():
}
log.Debug("received shutdown signal")
done()
}
|
