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pkiverifier.go
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pkiverifier.go
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package pkiverifier
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/x509"
"fmt"
"math/big"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/aporeto-inc/trireme/cache"
)
const (
// defaultValidity is the default cache validity in seconds
defaultValidity = 1
)
// PKITokenIssuer is the interface of an object that can issue a PKI token.
type PKITokenIssuer interface {
CreateTokenFromCertificate(*x509.Certificate) ([]byte, error)
}
// PKITokenVerifier is the interface of an object that can verify a PKI token.
type PKITokenVerifier interface {
Verify([]byte) (*ecdsa.PublicKey, error)
}
type verifierClaims struct {
X *big.Int
Y *big.Int
jwt.StandardClaims
}
type tokenManager struct {
publicKeys []*ecdsa.PublicKey
privateKey *ecdsa.PrivateKey
signMethod jwt.SigningMethod
keycache cache.DataStore
validity time.Duration
}
// NewPKIIssuer initializes a new signer structure
func NewPKIIssuer(privateKey *ecdsa.PrivateKey) PKITokenIssuer {
return &tokenManager{
privateKey: privateKey,
signMethod: jwt.SigningMethodES256,
}
}
// NewPKIVerifier returns a new PKIConfiguration.
func NewPKIVerifier(publicKeys []*ecdsa.PublicKey, cacheValidity time.Duration) PKITokenVerifier {
validity := defaultValidity * time.Second
if cacheValidity > 0 {
validity = cacheValidity
}
return &tokenManager{
publicKeys: publicKeys,
signMethod: jwt.SigningMethodES256,
keycache: cache.NewCacheWithExpiration("PKIVerifierKey", validity),
validity: validity,
}
}
// Verify verifies a token and returns the public key
func (p *tokenManager) Verify(token []byte) (*ecdsa.PublicKey, error) {
tokenString := string(token)
claims := &verifierClaims{}
if pk, err := p.keycache.Get(tokenString); err == nil {
return pk.(*ecdsa.PublicKey), nil
}
var JWTToken *jwt.Token
var err error
for _, pk := range p.publicKeys {
JWTToken, err = jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
return pk, nil
})
if err != nil || !JWTToken.Valid {
continue
}
pk := KeyFromClaims(claims)
if time.Now().Add(p.validity).Unix() <= claims.ExpiresAt {
p.keycache.AddOrUpdate(tokenString, pk)
}
return pk, nil
}
return nil, fmt.Errorf("Unable to verify token against any available public key")
}
// CreateTokenFromCertificate creates and signs a token
func (p *tokenManager) CreateTokenFromCertificate(cert *x509.Certificate) ([]byte, error) {
// Combine the application claims with the standard claims
claims := &verifierClaims{
X: cert.PublicKey.(*ecdsa.PublicKey).X,
Y: cert.PublicKey.(*ecdsa.PublicKey).Y,
}
claims.ExpiresAt = cert.NotAfter.Unix()
// Create the token and sign with our key
strtoken, err := jwt.NewWithClaims(p.signMethod, claims).SignedString(p.privateKey)
if err != nil {
return []byte{}, err
}
return []byte(strtoken), nil
}
// KeyFromClaims creates the public key structure from the claims
func KeyFromClaims(claims *verifierClaims) *ecdsa.PublicKey {
return &ecdsa.PublicKey{
Curve: elliptic.P256(),
X: claims.X,
Y: claims.Y,
}
}