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jfa-go/auth.go

249 lines
7.6 KiB

package main
import (
"encoding/base64"
"fmt"
"os"
"strconv"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/gin-gonic/gin"
"github.com/lithammer/shortuuid/v3"
)
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) (string, string, error) {
var token, refresh string
claims := jwt.MapClaims{
"valid": true,
"id": userId,
"exp": strconv.FormatInt(time.Now().Add(time.Minute*20).Unix(), 10),
"jfid": jfId,
"type": "bearer",
}
tk := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
token, err := tk.SignedString([]byte(os.Getenv("JFA_SECRET")))
if err != nil {
return "", "", err
}
claims["exp"] = strconv.FormatInt(time.Now().Add(time.Hour*24).Unix(), 10)
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
}
// Check header for token
func (app *appContext) authenticate(gc *gin.Context) {
header := strings.SplitN(gc.Request.Header.Get("Authorization"), " ", 2)
if header[0] != "Basic" {
app.debug.Println("Invalid authentication header")
respond(401, "Unauthorized", gc)
return
}
auth, _ := base64.StdEncoding.DecodeString(header[1])
creds := strings.SplitN(string(auth), ":", 2)
token, err := jwt.Parse(creds[0], checkToken)
if err != nil {
app.debug.Printf("Auth denied: %s", err)
respond(401, "Unauthorized", gc)
return
}
claims, ok := token.Claims.(jwt.MapClaims)
expiryUnix, err := strconv.ParseInt(claims["exp"].(string), 10, 64)
if err != nil {
app.debug.Printf("Auth denied: %s", err)
respond(401, "Unauthorized", gc)
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")
respond(401, "Unauthorized", gc)
return
}
userID := claims["id"].(string)
jfID := claims["jfid"].(string)
match := false
for _, user := range app.users {
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)
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.
}
// getToken checks the header for a username and password, as well as checking the refresh cookie.
// @Summary Grabs an API token using username & password, or via a refresh cookie.
// @description 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 use the token as your -Username-. The password can be anything.
// @Produce json
// @Success 200 {object} getTokenDTO
// @Failure 401 {object} stringResponse
// @Router /getToken [get]
// @tags Auth
// @Security getTokenAuth
func (app *appContext) getToken(gc *gin.Context) {
app.info.Println("Token requested (login attempt)")
header := strings.SplitN(gc.Request.Header.Get("Authorization"), " ", 2)
auth, _ := base64.StdEncoding.DecodeString(header[1])
creds := strings.SplitN(string(auth), ":", 2)
// check cookie first
var userID, jfID string
valid := false
noLogin := false
checkLogin := func() {
if creds[0] == "" || creds[1] == "" {
app.debug.Println("Auth denied: blank username/password")
respond(401, "Unauthorized", gc)
return
}
match := false
for _, user := range app.users {
if user.Username == creds[0] && user.Password == creds[1] {
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 {
var status int
var err error
var user map[string]interface{}
user, status, err = app.authJf.Authenticate(creds[0], creds[1])
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
}
jfID = user["Id"].(string)
if app.config.Section("ui").Key("admin_only").MustBool(true) {
if !user["Policy"].(map[string]interface{})["IsAdministrator"].(bool) {
app.debug.Printf("Auth denied: Users \"%s\" isn't admin", creds[0])
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\"", creds[0])
app.users = append(app.users, newUser)
}
valid = true
}
checkCookie := func() {
cookie, err := gc.Cookie("refresh")
if err == nil && cookie != "" {
for _, token := range app.invalidTokens {
if cookie == token {
if creds[0] == "" || creds[1] == "" {
app.debug.Println("getToken denied: Invalid refresh token and no username/password provided")
respond(401, "Unauthorized", gc)
noLogin = true
return
}
app.debug.Println("getToken: Invalid token but username/password provided")
return
}
}
token, err := jwt.Parse(cookie, checkToken)
if err != nil {
if creds[0] == "" || creds[1] == "" {
app.debug.Println("getToken denied: Invalid refresh token and no username/password provided")
respond(401, "Unauthorized", gc)
noLogin = true
return
}
app.debug.Println("getToken: Invalid token but username/password provided")
return
}
claims, ok := token.Claims.(jwt.MapClaims)
expiryUnix, err := strconv.ParseInt(claims["exp"].(string), 10, 64)
if err != nil {
if creds[0] == "" || creds[1] == "" {
app.debug.Printf("getToken denied: Invalid token (%s) and no username/password provided", err)
respond(401, "Unauthorized", gc)
noLogin = true
return
}
app.debug.Printf("getToken: Invalid token (%s) but username/password provided", err)
return
}
expiry := time.Unix(expiryUnix, 0)
if !(ok && token.Valid && claims["type"].(string) == "refresh" && expiry.After(time.Now())) {
if creds[0] == "" || creds[1] == "" {
app.debug.Printf("getToken denied: Invalid token (%s) and no username/password provided", err)
respond(401, "Unauthorized", gc)
noLogin = true
return
}
app.debug.Printf("getToken: Invalid token (%s) but username/password provided", err)
return
}
userID = claims["id"].(string)
jfID = claims["jfid"].(string)
valid = true
}
}
checkCookie()
if !valid && !noLogin {
checkLogin()
}
if valid {
token, refresh, err := CreateToken(userID, jfID)
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})
} else {
gc.AbortWithStatus(401)
}
}