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jwt.go
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jwt.go
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// Copyright 2022 Cloudbase Solutions SRL
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package auth
import (
"context"
"encoding/json"
"fmt"
"log/slog"
"net/http"
"strings"
jwt "github.com/golang-jwt/jwt/v5"
runnerErrors "github.com/cloudbase/garm-provider-common/errors"
apiParams "github.com/cloudbase/garm/apiserver/params"
"github.com/cloudbase/garm/config"
dbCommon "github.com/cloudbase/garm/database/common"
)
// JWTClaims holds JWT claims
type JWTClaims struct {
UserID string `json:"user"`
TokenID string `json:"token_id"`
FullName string `json:"full_name"`
IsAdmin bool `json:"is_admin"`
ReadMetrics bool `json:"read_metrics"`
jwt.RegisteredClaims
}
// jwtMiddleware is the authentication middleware
// used with gorilla
type jwtMiddleware struct {
store dbCommon.Store
cfg config.JWTAuth
}
// NewjwtMiddleware returns a populated jwtMiddleware
func NewjwtMiddleware(store dbCommon.Store, cfg config.JWTAuth) (Middleware, error) {
return &jwtMiddleware{
store: store,
cfg: cfg,
}, nil
}
func (amw *jwtMiddleware) claimsToContext(ctx context.Context, claims *JWTClaims) (context.Context, error) {
if claims == nil {
return ctx, runnerErrors.ErrUnauthorized
}
if claims.UserID == "" {
return nil, runnerErrors.ErrUnauthorized
}
userInfo, err := amw.store.GetUserByID(ctx, claims.UserID)
if err != nil {
return ctx, runnerErrors.ErrUnauthorized
}
ctx = PopulateContext(ctx, userInfo)
return ctx, nil
}
func invalidAuthResponse(ctx context.Context, w http.ResponseWriter) {
w.Header().Add("Content-Type", "application/json")
w.WriteHeader(http.StatusUnauthorized)
if err := json.NewEncoder(w).Encode(
apiParams.APIErrorResponse{
Error: "Authentication failed",
}); err != nil {
slog.With(slog.Any("error", err)).ErrorContext(ctx, "failed to encode response")
}
}
// Middleware implements the middleware interface
func (amw *jwtMiddleware) Middleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// nolint:golangci-lint,godox
// TODO: Log error details when authentication fails
ctx := r.Context()
authorizationHeader := r.Header.Get("authorization")
if authorizationHeader == "" {
invalidAuthResponse(ctx, w)
return
}
bearerToken := strings.Split(authorizationHeader, " ")
if len(bearerToken) != 2 {
invalidAuthResponse(ctx, w)
return
}
claims := &JWTClaims{}
token, err := jwt.ParseWithClaims(bearerToken[1], claims, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("invalid signing method")
}
return []byte(amw.cfg.Secret), nil
})
if err != nil {
invalidAuthResponse(ctx, w)
return
}
if !token.Valid {
invalidAuthResponse(ctx, w)
return
}
ctx, err = amw.claimsToContext(ctx, claims)
if err != nil {
invalidAuthResponse(ctx, w)
return
}
if !IsEnabled(ctx) {
invalidAuthResponse(ctx, w)
return
}
next.ServeHTTP(w, r.WithContext(ctx))
})
}