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issuer.go
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issuer.go
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package jwttest
import (
"context"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/json"
"net/http"
"github.com/go-jose/go-jose/v3"
"github.com/go-jose/go-jose/v3/jwt"
"github.com/google/uuid"
"github.com/anz-bank/sysl-go/jwtauth"
"github.com/anz-bank/sysl-go/jwtauth/jwthttp"
)
// Issuer is a test issuer to issue jwts with claims on demand
//
// Intended for easy testing. Use Issue to create a new jwt that can be authenticated by the public key
//
// ServeHTTP serves the public key as a jwks payload.
type Issuer struct {
jose.Signer
PubKey *jose.JSONWebKey
Name string
}
// NewIssuer creates a new jwt token issuer with a RS256 key of given size.
func NewIssuer(name string, keysize int) (Issuer, error) {
pub, priv, err := GenRSKeys(keysize)
if err != nil {
return Issuer{}, err
}
sigKey := jose.SigningKey{
Algorithm: jose.RS256,
Key: priv,
}
sig, err := jose.NewSigner(sigKey, &jose.SignerOptions{
ExtraHeaders: map[jose.HeaderKey]interface{}{
jose.HeaderType: "jwt",
},
})
return Issuer{
Signer: sig,
PubKey: pub,
Name: name,
}, err
}
// Issue issues a new jwt with the given claims.
func (i Issuer) Issue(claims jwtauth.Claims) (string, error) {
return i.IssueFromMap(claims)
}
// IssueFromMap issues a new jwt with the given claims.
func (i Issuer) IssueFromMap(claims map[string]interface{}) (string, error) {
// If claims contains an issuer name, tester has set it deliberately, don't touch it
issuerNameWrapper, ok := claims["iss"]
if !ok {
claims["iss"] = i.Name
} else {
issuerName, ok := issuerNameWrapper.(string)
if ok && issuerName == "" {
claims["iss"] = i.Name
}
}
return jwt.Signed(i.Signer).Claims(claims).CompactSerialize()
}
// Verify implements jwtauth.Verifier.
func (i Issuer) Verify(token *jwt.JSONWebToken, claims ...interface{}) error {
return token.Claims(i.PubKey, claims...)
}
// Authenticate implements jwtauth.Authenticator
//
// Checks the issuer on the inbound jwt matches the name of the issuer.
func (i Issuer) Authenticate(ctx context.Context, token string) (jwtauth.Claims, error) {
parsed, err := jwt.ParseSigned(token)
if err != nil {
return jwtauth.Claims{}, &jwtauth.AuthError{
Code: jwtauth.AuthErrCodeInvalidJWT,
Cause: err,
}
}
var insecureClaims jwt.Claims
if err := parsed.UnsafeClaimsWithoutVerification(&insecureClaims); err != nil {
return jwtauth.Claims{}, &jwtauth.AuthError{
Code: jwtauth.AuthErrCodeInvalidJWT,
Cause: err,
}
}
if insecureClaims.Issuer != i.Name {
return jwtauth.Claims{}, &jwtauth.AuthError{
Code: jwtauth.AuthErrCodeUntrustedSource,
Cause: err,
}
}
var claims jwtauth.Claims
if err := i.Verify(parsed, &claims); err != nil {
return jwtauth.Claims{}, &jwtauth.AuthError{
Code: jwtauth.AuthErrCodeBadSignature,
Cause: err,
}
}
return claims, nil
}
// Authenticator produces a standard authenticator with only this issuer as a trusted issuer.
func (i Issuer) Authenticator() jwtauth.Authenticator {
return &jwtauth.StdAuthenticator{
Verifiers: map[string]jwtauth.Verifier{
i.Name: i,
},
}
}
func (i Issuer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
jwks := jose.JSONWebKeySet{
Keys: []jose.JSONWebKey{
*i.PubKey,
},
}
payload, err := json.Marshal(jwks)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
_, _ = w.Write(payload)
}
// HTTPAuth returns an httpauth middleware struct with the issuer set as the authenticator.
func (i Issuer) HTTPAuth() *jwthttp.Auth {
return &jwthttp.Auth{
Headers: []string{"Authorization"},
Authenticator: i,
}
}
// Not sure what we want to do about this, we should be able to stand up a full blown test issuer where we can ask it for tokens and public keys
//
// // ServeToken serves a token with the requested claims
// //
// // Request body should be a json payload with the claims the requestor wants in their jwt
// func (i Issuer) ServeToken(w http.ResponseWriter, r *http.Request) {
// body, err := io.ReadAll(r.Body)
// if err != nil {
// w.WriteHeader(http.StatusBadRequest)
// w.Write([]byte("Failed to read body"))
// return
// }
// var claims jwtauth.Claims
// if err := json.Unmarshal(body, &claims); err != nil {
// w.WriteHeader(http.StatusBadRequest)
// w.Write([]byte("Invalid claims payload"))
// return
// }
// token, err := i.Issue(claims)
// if err != nil {
// w.WriteHeader(http.StatusInternalServerError)
// w.Write([]byte("Failed to issue token with requested claims"))
// return
// }
// w.WriteHeader(http.StatusOK)
// w.Write([]byte(token))
// }
// GenRSKeys generates a public/private key pair for signing using RS256 algorithm.
func GenRSKeys(keysize int) (*jose.JSONWebKey, *jose.JSONWebKey, error) {
privKey, err := rsa.GenerateKey(rand.Reader, keysize) // TODO: set key size?
if err != nil {
return nil, nil, err
}
pubKey := privKey.Public()
kidUUID, err := uuid.NewRandom()
if err != nil {
return nil, nil, err
}
kid := kidUUID.String()
alg := jose.RS256
pub := &jose.JSONWebKey{
KeyID: kid,
Certificates: []*x509.Certificate{},
Key: pubKey,
Algorithm: string(alg),
Use: "sig",
}
priv := &jose.JSONWebKey{
KeyID: kid,
Certificates: []*x509.Certificate{},
Key: privKey,
Algorithm: string(alg),
Use: "sig",
}
return pub, priv, nil
}