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main.go
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main.go
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// Copyright 2020 the Exposure Notifications Server authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This tool attempts to sign a string with all configured export signing keys
// in the system.
package main
import (
"context"
"crypto"
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"flag"
"fmt"
"os/signal"
"syscall"
"time"
"github.com/google/exposure-notifications-server/internal/buildinfo"
"github.com/google/exposure-notifications-server/internal/export"
"github.com/google/exposure-notifications-server/internal/export/database"
"github.com/google/exposure-notifications-server/internal/setup"
"github.com/google/exposure-notifications-server/pkg/logging"
)
var messageToSign = flag.String("message", "hello world", "string message to sign")
func main() {
ctx, done := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
logger := logging.NewLoggerFromEnv().Named("tools.sign")
logger = logger.With("build_id", buildinfo.BuildID)
logger = logger.With("build_tag", buildinfo.BuildTag)
ctx = logging.WithLogger(ctx, logger)
err := realMain(ctx)
done()
if err != nil {
logger.Fatal(err)
}
}
func realMain(ctx context.Context) error {
flag.Parse()
if *messageToSign == "" {
return fmt.Errorf("--message is required and cannot be empty")
}
logger := logging.FromContext(ctx)
var config export.Config
env, err := setup.Setup(ctx, &config)
if err != nil {
return fmt.Errorf("setup.Setup: %w", err)
}
defer env.Close(ctx)
exportDB := database.New(env.Database())
allSigInfos, err := exportDB.ListAllSignatureInfos(ctx)
if err != nil {
return fmt.Errorf("unable to list signature infos, %w", err)
}
digest := sha256.Sum256([]byte(*messageToSign))
logger.Infow("digest to sign", "digest", base64.StdEncoding.EncodeToString(digest[:]))
now := time.Now().UTC()
for _, sigInfo := range allSigInfos {
if !sigInfo.EndTimestamp.IsZero() && now.After(sigInfo.EndTimestamp) {
logger.Warnw("skipping expired signing key", "kid", sigInfo.SigningKeyID, "version", sigInfo.SigningKeyVersion, "expiry", sigInfo.FormattedEndTimestamp())
continue
}
signer, err := env.GetSignerForKey(ctx, sigInfo.SigningKey)
if err != nil {
logger.Errorw("error accessing signing key", "sigInfo", sigInfo, "error", err)
continue
}
sig, err := signer.Sign(rand.Reader, digest[:], crypto.SHA256)
if err != nil {
logger.Errorw("error signing message", "sigInfo", sigInfo, "error", err)
continue
}
b64Signature := base64.StdEncoding.EncodeToString(sig)
logger.Infow("signature", "sigInfo", sigInfo, "message", *messageToSign, "signature", b64Signature)
}
return nil
}