/
fakejwt.go
158 lines (136 loc) · 3.24 KB
/
fakejwt.go
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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package testing
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"time"
"github.com/google/uuid"
"github.com/juju/errors"
"github.com/lestrrat-go/jwx/v2/jwa"
"github.com/lestrrat-go/jwx/v2/jwk"
"github.com/lestrrat-go/jwx/v2/jwt"
)
// JWTParams are the necessary params to issue a ready-to-go JWT.
type JWTParams struct {
Controller string
User string
Access map[string]string
}
func getJWKS() (jwk.Set, []byte, error) {
keySet, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return nil, nil, errors.Trace(err)
}
privateKeyPEM := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(keySet),
},
)
kid, err := uuid.NewRandom()
if err != nil {
return nil, nil, errors.Trace(err)
}
jwks, err := jwk.FromRaw(keySet.PublicKey)
if err != nil {
return nil, nil, errors.Trace(err)
}
err = jwks.Set(jwk.KeyIDKey, kid.String())
if err != nil {
return nil, nil, errors.Trace(err)
}
err = jwks.Set(jwk.KeyUsageKey, "sig")
if err != nil {
return nil, nil, errors.Trace(err)
}
err = jwks.Set(jwk.AlgorithmKey, jwa.RS256)
if err != nil {
return nil, nil, errors.Trace(err)
}
ks := jwk.NewSet()
err = ks.AddKey(jwks)
if err != nil {
return nil, nil, errors.Trace(err)
}
return ks, privateKeyPEM, nil
}
func generateJTI() (string, error) {
id, err := uuid.NewRandom()
if err != nil {
return "", err
}
return id.String(), nil
}
// NewJWKSet returns a new key set and signing key.
func NewJWKSet() (jwk.Set, jwk.Key, error) {
jwkSet, pkeyPem, err := getJWKS()
if err != nil {
return nil, nil, errors.Trace(err)
}
block, _ := pem.Decode(pkeyPem)
pkeyDecoded, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, nil, errors.Trace(err)
}
signingKey, err := jwk.FromRaw(pkeyDecoded)
if err != nil {
return nil, nil, errors.Trace(err)
}
return jwkSet, signingKey, nil
}
// NewJWT returns a parsed jwt.
func NewJWT(params JWTParams) (jwt.Token, error) {
jwkSet, signingKey, err := NewJWKSet()
if err != nil {
return nil, errors.Trace(err)
}
tok, err := EncodedJWT(params, jwkSet, signingKey)
if err != nil {
return nil, errors.Trace(err)
}
return jwt.Parse(
tok,
jwt.WithKeySet(jwkSet),
)
}
// EncodedJWT returns jwt as bytes signed by the specified key.
func EncodedJWT(params JWTParams, jwkSet jwk.Set, signingKey jwk.Key) ([]byte, error) {
jti, err := generateJTI()
if err != nil {
return nil, errors.Trace(err)
}
pubKey, ok := jwkSet.Key(jwkSet.Len() - 1)
if !ok {
return nil, errors.Errorf("no jwk found")
}
err = signingKey.Set(jwk.AlgorithmKey, jwa.RS256)
if err != nil {
return nil, errors.Trace(err)
}
err = signingKey.Set(jwk.KeyIDKey, pubKey.KeyID())
if err != nil {
return nil, errors.Trace(err)
}
token, err := jwt.NewBuilder().
Audience([]string{params.Controller}).
Subject(params.User).
Issuer("test").
JwtID(jti).
Claim("access", params.Access).
Expiration(time.Now().Add(time.Hour)).
Build()
if err != nil {
return nil, errors.Trace(err)
}
freshToken, err := jwt.Sign(
token,
jwt.WithKey(
jwa.RS256,
signingKey,
),
)
return freshToken, errors.Trace(err)
}