package main import ( "encoding/base64" "fmt" "os" "strings" "time" "github.com/gin-gonic/gin" "github.com/golang-jwt/jwt" "github.com/hrfee/mediabrowser" "github.com/lithammer/shortuuid/v3" ) const ( TOKEN_VALIDITY_SEC = 20 * 60 REFRESH_TOKEN_VALIDITY_SEC = 3600 * 24 ) func (app *appContext) webAuth() gin.HandlerFunc { return app.authenticate } // CreateToken returns a web token as well as a refresh token, which can be used to obtain new tokens. func CreateToken(userId, jfId string, admin bool) (string, string, error) { var token, refresh string claims := jwt.MapClaims{ "valid": true, "id": userId, "exp": time.Now().Add(time.Second * TOKEN_VALIDITY_SEC).Unix(), "jfid": jfId, "admin": admin, "type": "bearer", } tk := jwt.NewWithClaims(jwt.SigningMethodHS256, claims) token, err := tk.SignedString([]byte(os.Getenv("JFA_SECRET"))) if err != nil { return "", "", err } claims["exp"] = time.Now().Add(time.Second * REFRESH_TOKEN_VALIDITY_SEC).Unix() claims["type"] = "refresh" tk = jwt.NewWithClaims(jwt.SigningMethodHS256, claims) refresh, err = tk.SignedString([]byte(os.Getenv("JFA_SECRET"))) if err != nil { return "", "", err } return token, refresh, nil } // Caller should return if this returns false. func (app *appContext) decodeValidateAuthHeader(gc *gin.Context) (claims jwt.MapClaims, ok bool) { ok = false header := strings.SplitN(gc.Request.Header.Get("Authorization"), " ", 2) if header[0] != "Bearer" { app.debug.Println("Invalid authorization header") respond(401, "Unauthorized", gc) return } token, err := jwt.Parse(string(header[1]), checkToken) if err != nil { app.debug.Printf("Auth denied: %s", err) respond(401, "Unauthorized", gc) return } claims, ok = token.Claims.(jwt.MapClaims) if !ok { app.debug.Println("Invalid JWT") respond(401, "Unauthorized", gc) return } expiryUnix := int64(claims["exp"].(float64)) if err != nil { app.debug.Printf("Auth denied: %s", err) respond(401, "Unauthorized", gc) ok = false return } expiry := time.Unix(expiryUnix, 0) if !(ok && token.Valid && claims["type"].(string) == "bearer" && expiry.After(time.Now())) { app.debug.Printf("Auth denied: Invalid token") // app.debug.Printf("Expiry: %+v, OK: %t, Valid: %t, ClaimType: %s\n", expiry, ok, token.Valid, claims["type"].(string)) respond(401, "Unauthorized", gc) ok = false return } ok = true return } // Check header for token func (app *appContext) authenticate(gc *gin.Context) { claims, ok := app.decodeValidateAuthHeader(gc) if !ok { return } isAdminToken := claims["admin"].(bool) if !isAdminToken { app.debug.Printf("Auth denied: Token was not for admin access") respond(401, "Unauthorized", gc) return } userID := claims["id"].(string) jfID := claims["jfid"].(string) match := false for _, user := range app.adminUsers { if user.UserID == userID { match = true break } } if !match { app.debug.Printf("Couldn't find user ID \"%s\"", userID) respond(401, "Unauthorized", gc) return } gc.Set("jfId", jfID) gc.Set("userId", userID) gc.Set("userMode", false) app.debug.Println("Auth succeeded") gc.Next() } func checkToken(token *jwt.Token) (interface{}, error) { if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok { return nil, fmt.Errorf("Unexpected signing method %v", token.Header["alg"]) } return []byte(os.Getenv("JFA_SECRET")), nil } type getTokenDTO struct { Token string `json:"token" example:"kjsdklsfdkljfsjsdfklsdfkldsfjdfskjsdfjklsdf"` // API token for use with everything else. } func (app *appContext) decodeValidateLoginHeader(gc *gin.Context) (username, password string, ok bool) { header := strings.SplitN(gc.Request.Header.Get("Authorization"), " ", 2) auth, _ := base64.StdEncoding.DecodeString(header[1]) creds := strings.SplitN(string(auth), ":", 2) username = creds[0] password = creds[1] ok = false if username == "" || password == "" { app.debug.Println("Auth denied: blank username/password") respond(401, "Unauthorized", gc) return } ok = true return } func (app *appContext) validateJellyfinCredentials(username, password string, gc *gin.Context) (user mediabrowser.User, ok bool) { ok = false user, status, err := app.authJf.Authenticate(username, password) if status != 200 || err != nil { if status == 401 || status == 400 { app.info.Println("Auth denied: Invalid username/password (Jellyfin)") respond(401, "Unauthorized", gc) return } app.err.Printf("Auth failed: Couldn't authenticate with Jellyfin (%d/%s)", status, err) respond(500, "Jellyfin error", gc) return } ok = true return } // @Summary Grabs an API token using username & password. // @description If viewing docs locally, click the lock icon next to this, login with your normal jfa-go credentials. Click 'try it out', then 'execute' and an API Key will be returned, copy it (not including quotes). On any of the other routes, click the lock icon and set the API key as "Bearer `your api key`". // @Produce json // @Success 200 {object} getTokenDTO // @Failure 401 {object} stringResponse // @Router /token/login [get] // @tags Auth // @Security getTokenAuth func (app *appContext) getTokenLogin(gc *gin.Context) { app.info.Println("Token requested (login attempt)") username, password, ok := app.decodeValidateLoginHeader(gc) if !ok { return } var userID, jfID string match := false for _, user := range app.adminUsers { if user.Username == username && user.Password == password { match = true app.debug.Println("Found existing user") userID = user.UserID break } } if !app.jellyfinLogin && !match { app.info.Println("Auth denied: Invalid username/password") respond(401, "Unauthorized", gc) return } if !match { user, ok := app.validateJellyfinCredentials(username, password, gc) if !ok { return } jfID = user.ID if !app.config.Section("ui").Key("allow_all").MustBool(false) { accountsAdmin := false adminOnly := app.config.Section("ui").Key("admin_only").MustBool(true) if emailStore, ok := app.storage.emails[jfID]; ok { accountsAdmin = emailStore.Admin } accountsAdmin = accountsAdmin || (adminOnly && user.Policy.IsAdministrator) if !accountsAdmin { app.debug.Printf("Auth denied: Users \"%s\" isn't admin", username) respond(401, "Unauthorized", gc) return } } // New users are only added when using jellyfinLogin. userID = shortuuid.New() newUser := User{ UserID: userID, } app.debug.Printf("Token generated for user \"%s\"", username) app.adminUsers = append(app.adminUsers, newUser) } token, refresh, err := CreateToken(userID, jfID, true) if err != nil { app.err.Printf("getToken failed: Couldn't generate token (%s)", err) respond(500, "Couldn't generate token", gc) return } gc.SetCookie("refresh", refresh, (3600 * 24), "/", gc.Request.URL.Hostname(), true, true) gc.JSON(200, getTokenDTO{token}) } func (app *appContext) decodeValidateRefreshCookie(gc *gin.Context) (claims jwt.MapClaims, ok bool) { ok = false cookie, err := gc.Cookie("refresh") if err != nil || cookie == "" { app.debug.Printf("getTokenRefresh denied: Couldn't get token: %s", err) respond(400, "Couldn't get token", gc) return } for _, token := range app.invalidTokens { if cookie == token { app.debug.Println("getTokenRefresh: Invalid token") respond(401, "Invalid token", gc) return } } token, err := jwt.Parse(cookie, checkToken) if err != nil { app.debug.Println("getTokenRefresh: Invalid token") respond(400, "Invalid token", gc) return } claims, ok = token.Claims.(jwt.MapClaims) expiryUnix := int64(claims["exp"].(float64)) if err != nil { app.debug.Printf("getTokenRefresh: Invalid token expiry: %s", err) respond(401, "Invalid token", gc) ok = false return } expiry := time.Unix(expiryUnix, 0) if !(ok && token.Valid && claims["type"].(string) == "refresh" && expiry.After(time.Now())) { app.debug.Printf("getTokenRefresh: Invalid token: %+v", err) respond(401, "Invalid token", gc) ok = false return } ok = true return } // @Summary Grabs an API token using a refresh token from cookies. // @Produce json // @Success 200 {object} getTokenDTO // @Failure 401 {object} stringResponse // @Router /token/refresh [get] // @tags Auth func (app *appContext) getTokenRefresh(gc *gin.Context) { app.debug.Println("Token requested (refresh token)") claims, ok := app.decodeValidateRefreshCookie(gc) if !ok { return } userID := claims["id"].(string) jfID := claims["jfid"].(string) jwt, refresh, err := CreateToken(userID, jfID, true) if err != nil { app.err.Printf("getTokenRefresh failed: Couldn't generate token (%s)", err) respond(500, "Couldn't generate token", gc) return } gc.SetCookie("refresh", refresh, REFRESH_TOKEN_VALIDITY_SEC, "/", gc.Request.URL.Hostname(), true, true) gc.JSON(200, getTokenDTO{jwt}) }