feat(keygen): add -verify-token command

cmd/keygen/main.go

@@ -11,8 +11,10 @@ var (
 	createKeyCmd    = false
 	getPublicKeyCmd = false
 	createTokenCmd  = false
+	verifyTokenCmd  = false
 	debug           = false
 	keyFile         string
+	tokenFile       string
 	tokenIssuer     string
 	tokenPeerID     = uuid.New()
 	keySize         = 2048
@@ -28,12 +30,17 @@ func init() {
 		&createTokenCmd, "create-token", createTokenCmd,
 		"Create a new signed authentication token",
 	)
+	flag.BoolVar(
+		&verifyTokenCmd, "verify-token", verifyTokenCmd,
+		"Verify a token generated with the given key",
+	)
 	flag.BoolVar(
 		&getPublicKeyCmd, "get-public-key", getPublicKeyCmd,
 		"Get the PEM encoded public key associated with the private key",
 	)
 	flag.BoolVar(&debug, "debug", debug, "Debug mode")
 	flag.StringVar(&keyFile, "key", keyFile, "Path to the encrypted PEM encoded key")
+	flag.StringVar(&tokenFile, "token", tokenFile, "Path to the token to verify")
 	flag.StringVar(&tokenIssuer, "token-issuer", tokenIssuer, "Token issuer")
 	flag.StringVar(&tokenPeerID, "token-peer-id", tokenPeerID, "Token peer ID")
 	flag.IntVar(&keySize, "key-size", keySize, "Size of the private key")
@@ -48,6 +55,8 @@ func main() {
 		getPublicKey()
 	case createTokenCmd:
 		createToken()
+	case verifyTokenCmd:
+		verifyToken()
 	default:
 		flag.Usage()
 	}

cmd/keygen/util.go

@@ -2,10 +2,7 @@ package main
 
 import (
 	"bytes"
-	"crypto/rand"
 	"crypto/rsa"
-	"crypto/x509"
-	"encoding/pem"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -47,25 +44,6 @@ func askPassphrase() ([]byte, error) {
 	return passphrase, nil
 }
 
-func privateKeyToEncryptedPEM(key *rsa.PrivateKey, passphrase []byte) ([]byte, error) {
-	if passphrase == nil {
-		return nil, errors.New("passphrase cannot be empty")
-	}
-
-	// Convert it to pem
-	block := &pem.Block{
-		Type:  "RSA PRIVATE KEY",
-		Bytes: x509.MarshalPKCS1PrivateKey(key),
-	}
-
-	block, err := x509.EncryptPEMBlock(rand.Reader, block.Type, block.Bytes, passphrase, x509.PEMCipherAES256)
-	if err != nil {
-		return nil, errors.WithStack(err)
-	}
-
-	return pem.EncodeToMemory(block), nil
-}
-
 func loadPrivateKey() (*rsa.PrivateKey, error) {
 	if keyFile == "" {
 		return nil, errors.New("you must specify a key file to load")
@@ -85,6 +63,19 @@ func loadPrivateKey() (*rsa.PrivateKey, error) {
 	return privateKey, nil
 }
 
+func loadToken() ([]byte, error) {
+	if tokenFile == "" {
+		return nil, errors.New("you must specify a token file to load")
+	}
+
+	token, err := os.ReadFile(tokenFile)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	return token, nil
+}
+
 func handleError(err error) {
 	if !debug {
 		fmt.Printf("%+v\n", errors.WithStack(err))

cmd/keygen/verify_token.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+
+	peering "forge.cadoles.com/Cadoles/go-http-peering"
+	"github.com/dgrijalva/jwt-go"
+	"github.com/pkg/errors"
+)
+
+func verifyToken() {
+	rawToken, err := loadToken()
+	if err != nil {
+		handleError(errors.WithStack(err))
+	}
+
+	privateKey, err := loadPrivateKey()
+	if err != nil {
+		handleError(errors.WithStack(err))
+	}
+
+	fn := func(token *jwt.Token) (interface{}, error) {
+		return &privateKey.PublicKey, nil
+	}
+
+	token, err := jwt.ParseWithClaims(string(rawToken), &peering.ServerTokenClaims{}, fn)
+	if err != nil {
+		validationError, ok := err.(*jwt.ValidationError)
+		if ok {
+			handleError(errors.WithStack(validationError.Inner))
+		}
+
+		handleError(errors.WithStack(err))
+	}
+
+	if !token.Valid {
+		handleError(errors.New("token is invalid"))
+	}
+
+	claims, ok := token.Claims.(*peering.ServerTokenClaims)
+	if !ok {
+		handleError(errors.New("unexpected token claims"))
+	}
+
+	data, err := json.MarshalIndent(claims, "", "  ")
+	if err != nil {
+		handleError(errors.WithStack(err))
+	}
+
+	fmt.Println("Token OK.")
+	fmt.Println("Claims:")
+	fmt.Println(string(data))
+
+}