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auth.go
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auth.go
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// Package middleware provides oauth2 support as well as related middlewares.
package middleware
import (
"net/http"
"github.com/pkg/errors"
"github.com/go-pkgz/auth/logger"
"github.com/go-pkgz/auth/provider"
"github.com/go-pkgz/auth/token"
)
// Authenticator is top level auth object providing middlewares
type Authenticator struct {
logger.L
JWTService TokenService
Providers []provider.Service
Validator token.Validator
AdminPasswd string
}
// TokenService defines interface accessing tokens
type TokenService interface {
Parse(tokenString string) (claims token.Claims, err error)
Set(w http.ResponseWriter, claims token.Claims) error
Get(r *http.Request) (claims token.Claims, token string, err error)
IsExpired(claims token.Claims) bool
Reset(w http.ResponseWriter)
}
var adminUser = token.User{
ID: "admin",
Name: "admin",
Attributes: map[string]interface{}{
"admin": true,
},
}
// Auth middleware adds auth from session and populates user info
func (a *Authenticator) Auth(next http.Handler) http.Handler {
return a.auth(true)(next)
}
// Trace middleware doesn't require valid user but if user info presented populates info
func (a *Authenticator) Trace(next http.Handler) http.Handler {
return a.auth(false)(next)
}
// auth implements all logic for authentication (reqAuth=true) and tracing (reqAuth=false)
func (a *Authenticator) auth(reqAuth bool) func(http.Handler) http.Handler {
onError := func(h http.Handler, w http.ResponseWriter, r *http.Request, err error) {
if err == nil {
return
}
if !reqAuth {
h.ServeHTTP(w, r)
return
}
a.Logf("[DEBUG] auth failed, %v", err)
http.Error(w, "Unauthorized", http.StatusUnauthorized)
}
f := func(h http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
// use admin user basic auth if enabled
if a.basicAdminUser(r) {
r = token.SetUserInfo(r, adminUser)
h.ServeHTTP(w, r)
return
}
claims, tkn, err := a.JWTService.Get(r)
if err != nil {
onError(h, w, r, errors.Wrap(err, "can't get token"))
return
}
if claims.Handshake != nil { // handshake in token indicate special use cases, not for login
onError(h, w, r, errors.New("invalid kind of token"))
return
}
if claims.User == nil {
onError(h, w, r, errors.New("failed auth, no user info presented in the claim"))
return
}
if claims.User != nil { // if uinfo in token populate it to context
// validator passed by client and performs check on token or/and claims
if a.Validator != nil && !a.Validator.Validate(tkn, claims) {
onError(h, w, r, errors.Errorf("user %s/%s blocked", claims.User.Name, claims.User.ID))
a.JWTService.Reset(w)
return
}
if a.JWTService.IsExpired(claims) {
if claims, err = a.refreshExpiredToken(w, claims); err != nil {
a.JWTService.Reset(w)
onError(h, w, r, errors.Wrap(err, "can't refresh token"))
return
}
a.Logf("[DEBUG] token refreshed for %+v", claims.User)
}
r = token.SetUserInfo(r, *claims.User) // populate user info to request context
}
h.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
return f
}
// refreshExpiredToken makes a new token with passed claims
func (a *Authenticator) refreshExpiredToken(w http.ResponseWriter, claims token.Claims) (token.Claims, error) {
claims.ExpiresAt = 0 // this will cause now+duration for refreshed token
if err := a.JWTService.Set(w, claims); err != nil {
return token.Claims{}, err
}
return claims, nil
}
// AdminOnly middleware allows access for admins only
func (a *Authenticator) AdminOnly(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
user, err := token.GetUserInfo(r)
if err != nil {
http.Error(w, "Unauthorized", http.StatusUnauthorized)
return
}
if !user.IsAdmin() {
http.Error(w, "Access denied", http.StatusForbidden)
return
}
next.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
// basic auth for admin user
func (a *Authenticator) basicAdminUser(r *http.Request) bool {
if a.AdminPasswd == "" {
return false
}
user, passwd, ok := r.BasicAuth()
if !ok {
return false
}
if user != "admin" || passwd != a.AdminPasswd {
a.Logf("[WARN] admin basic auth failed, user/passwd mismatch, %s:%s", user, passwd)
return false
}
return true
}