/
validator.go
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/
validator.go
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package jwt
import (
"fmt"
"strings"
"github.com/datarhei/core/v16/http/api"
"github.com/datarhei/core/v16/http/handler/util"
"github.com/datarhei/core/v16/http/jwt/jwks"
jwtgo "github.com/golang-jwt/jwt/v5"
"github.com/labstack/echo/v4"
)
type Validator interface {
String() string
// Validate returns true if it identified itself as validator for
// that request. False if it doesn't handle this request. The string
// is the username. An error is only returned if it identified itself
// as validator but there was an error during validation.
Validate(c echo.Context) (bool, string, error)
Cancel()
}
type localValidator struct {
username string
password string
}
func NewLocalValidator(username, password string) (Validator, error) {
v := &localValidator{
username: username,
password: password,
}
return v, nil
}
func (v *localValidator) String() string {
return "localjwt"
}
func (v *localValidator) Validate(c echo.Context) (bool, string, error) {
var login api.Login
if err := util.ShouldBindJSON(c, &login); err != nil {
return false, "", nil
}
if login.Username != v.username || login.Password != v.password {
return true, "", fmt.Errorf("invalid username or password")
}
return true, v.username, nil
}
func (v *localValidator) Cancel() {}
type auth0Validator struct {
domain string
issuer string
audience string
clientID string
users []string
certs jwks.JWKS
}
func NewAuth0Validator(domain, audience, clientID string, users []string) (Validator, error) {
v := &auth0Validator{
domain: domain,
issuer: "https://" + domain + "/",
audience: audience,
clientID: clientID,
users: users,
}
url := v.issuer + ".well-known/jwks.json"
certs, err := jwks.NewFromURL(url, jwks.Config{})
if err != nil {
return nil, err
}
v.certs = certs
return v, nil
}
func (v auth0Validator) String() string {
return fmt.Sprintf("auth0 domain=%s audience=%s clientid=%s", v.domain, v.audience, v.clientID)
}
func (v *auth0Validator) Validate(c echo.Context) (bool, string, error) {
// Look for an Auth header
values := c.Request().Header.Values("Authorization")
prefix := "Bearer "
auth := ""
for _, value := range values {
if !strings.HasPrefix(value, prefix) {
continue
}
auth = value[len(prefix):]
break
}
if len(auth) == 0 {
return false, "", nil
}
p := &jwtgo.Parser{}
token, _, err := p.ParseUnverified(auth, jwtgo.MapClaims{})
if err != nil {
return false, "", nil
}
var issuer string
if claims, ok := token.Claims.(jwtgo.MapClaims); ok {
if iss, ok := claims["iss"]; ok {
issuer = iss.(string)
}
}
if issuer != v.issuer {
return false, "", nil
}
token, err = jwtgo.Parse(auth, v.keyFunc)
if err != nil {
return true, "", err
}
if !token.Valid {
return true, "", fmt.Errorf("invalid token")
}
var subject string
if claims, ok := token.Claims.(jwtgo.MapClaims); ok {
if sub, ok := claims["sub"]; ok {
subject = sub.(string)
}
}
return true, subject, nil
}
func (v *auth0Validator) keyFunc(token *jwtgo.Token) (interface{}, error) {
// Verify 'aud' claim
if _, err := token.Claims.GetAudience(); err != nil {
return nil, fmt.Errorf("invalid audience: %w", err)
}
// Verify 'iss' claim
if _, err := token.Claims.GetIssuer(); err != nil {
return nil, fmt.Errorf("invalid issuer: %w", err)
}
// Verify 'sub' claim
sub, err := token.Claims.GetSubject()
if err != nil {
return nil, fmt.Errorf("invalid subject: %w", err)
}
found := false
for _, u := range v.users {
if sub == u {
found = true
break
}
}
if !found {
return nil, fmt.Errorf("user not allowed")
}
// find the key
if _, ok := token.Header["kid"]; !ok {
return nil, fmt.Errorf("kid not found")
}
kid := token.Header["kid"].(string)
key, err := v.certs.Key(kid)
if err != nil {
return nil, fmt.Errorf("no cert for kid found: %w", err)
}
// find algorithm
if _, ok := token.Header["alg"]; !ok {
return nil, fmt.Errorf("kid not found")
}
alg := token.Header["alg"].(string)
if key.Alg() != alg {
return nil, fmt.Errorf("signing method doesn't match")
}
// get the public key
publicKey, err := key.PublicKey()
if err != nil {
return nil, fmt.Errorf("invalid public key: %w", err)
}
return publicKey, nil
}
func (v *auth0Validator) Cancel() {
v.certs.Cancel()
}