filebrowser/http/auth.go

198 lines
4.8 KiB
Go

package http
import (
"encoding/json"
"log"
"net/http"
"os"
"strings"
"time"
jwt "github.com/dgrijalva/jwt-go"
"github.com/dgrijalva/jwt-go/request"
"github.com/filebrowser/filebrowser/v2/errors"
"github.com/filebrowser/filebrowser/v2/users"
)
const (
TokenExpirationTime = time.Hour * 2
)
type userInfo struct {
ID uint `json:"id"`
Locale string `json:"locale"`
ViewMode users.ViewMode `json:"viewMode"`
Perm users.Permissions `json:"perm"`
Commands []string `json:"commands"`
LockPassword bool `json:"lockPassword"`
}
type authToken struct {
User userInfo `json:"user"`
jwt.StandardClaims
}
type extractor []string
func (e extractor) ExtractToken(r *http.Request) (string, error) {
token, _ := request.HeaderExtractor{"X-Auth"}.ExtractToken(r)
// Checks if the token isn't empty and if it contains two dots.
// The former prevents incompatibility with URLs that previously
// used basic auth.
if token != "" && strings.Count(token, ".") == 2 {
return token, nil
}
auth := r.URL.Query().Get("auth")
if auth == "" {
return "", request.ErrNoTokenInRequest
}
return auth, nil
}
func withUser(fn handleFunc) handleFunc {
return func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
keyFunc := func(token *jwt.Token) (interface{}, error) {
return d.settings.Key, nil
}
var tk authToken
token, err := request.ParseFromRequest(r, &extractor{}, keyFunc, request.WithClaims(&tk))
if err != nil || !token.Valid {
return http.StatusForbidden, nil
}
expired := !tk.VerifyExpiresAt(time.Now().Add(time.Hour).Unix(), true)
updated := d.store.Users.LastUpdate(tk.User.ID) > tk.IssuedAt
if expired || updated {
w.Header().Add("X-Renew-Token", "true")
}
d.user, err = d.store.Users.Get(d.server.Root, tk.User.ID)
if err != nil {
return http.StatusInternalServerError, err
}
return fn(w, r, d)
}
}
func withAdmin(fn handleFunc) handleFunc {
return withUser(func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
if !d.user.Perm.Admin {
return http.StatusForbidden, nil
}
return fn(w, r, d)
})
}
var loginHandler = func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
auther, err := d.store.Auth.Get(d.settings.AuthMethod)
if err != nil {
return http.StatusInternalServerError, err
}
user, err := auther.Auth(r, d.store.Users, d.server.Root)
if err == os.ErrPermission {
return http.StatusForbidden, nil
} else if err != nil {
return http.StatusInternalServerError, err
} else {
return printToken(w, r, d, user)
}
}
type signupBody struct {
Username string `json:"username"`
Password string `json:"password"`
}
var signupHandler = func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
if !d.settings.Signup {
return http.StatusMethodNotAllowed, nil
}
if r.Body == nil {
return http.StatusBadRequest, nil
}
info := &signupBody{}
err := json.NewDecoder(r.Body).Decode(info)
if err != nil {
return http.StatusBadRequest, err
}
if info.Password == "" || info.Username == "" {
return http.StatusBadRequest, nil
}
user := &users.User{
Username: info.Username,
}
d.settings.Defaults.Apply(user)
pwd, err := users.HashPwd(info.Password)
if err != nil {
return http.StatusInternalServerError, err
}
user.Password = pwd
userHome, err := d.settings.MakeUserDir(user.Username, user.Scope, d.server.Root)
if err != nil {
log.Printf("create user: failed to mkdir user home dir: [%s]", userHome)
return http.StatusInternalServerError, err
}
user.Scope = userHome
log.Printf("new user: %s, home dir: [%s].", user.Username, userHome)
err = d.store.Users.Save(user)
if err == errors.ErrExist {
return http.StatusConflict, err
} else if err != nil {
return http.StatusInternalServerError, err
}
return http.StatusOK, nil
}
var renewHandler = withUser(func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
return printToken(w, r, d, d.user)
})
func printToken(w http.ResponseWriter, _ *http.Request, d *data, user *users.User) (int, error) {
claims := &authToken{
User: userInfo{
ID: user.ID,
Locale: user.Locale,
ViewMode: user.ViewMode,
Perm: user.Perm,
LockPassword: user.LockPassword,
Commands: user.Commands,
},
StandardClaims: jwt.StandardClaims{
IssuedAt: time.Now().Unix(),
ExpiresAt: time.Now().Add(TokenExpirationTime).Unix(),
Issuer: "File Browser",
},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
signed, err := token.SignedString(d.settings.Key)
if err != nil {
return http.StatusInternalServerError, err
}
w.Header().Set("Content-Type", "cty")
if _, err := w.Write([]byte(signed)); err != nil {
return http.StatusInternalServerError, err
}
return 0, nil
}