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package security
import (
"errors"
"fmt"
"net"
"net/http"
"strings"
"time"
"github.com/chrislusf/weed-fs/go/glog"
"github.com/dgrijalva/jwt-go"
)
var (
ErrUnauthorized = errors.New("unauthorized token")
)
/*
Guard is to ensure data access security.
There are 2 ways to check access:
1. white list. It's checking request ip address.
2. JSON Web Token(JWT) generated from secretKey.
The jwt can come from:
1. url parameter jwt=...
2. request header "Authorization"
3. cookie with the name "jwt"
The white list is checked first because it is easy.
Then the JWT is checked.
The Guard will also check these claims if provided:
1. "exp" Expiration Time
2. "nbf" Not Before
Generating JWT:
1. use HS256 to sign
2. optionally set "exp", "nbf" fields, in Unix time,
the number of seconds elapsed since January 1, 1970 UTC.
Referenced:
https://github.com/pkieltyka/jwtauth/blob/master/jwtauth.go
*/
type Guard struct {
whiteList []string
secretKey string
isActive bool
}
func NewGuard(whiteList []string, secretKey string) *Guard {
g := &Guard{whiteList: whiteList, secretKey: secretKey}
g.isActive = len(g.whiteList) != 0 || len(g.secretKey) != 0
return g
}
func (g *Guard) Secure(f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
if !g.isActive {
//if no security needed, just skip all checkings
return f
}
return func(w http.ResponseWriter, r *http.Request) {
if err := g.doCheck(w, r); err != nil {
w.WriteHeader(http.StatusUnauthorized)
return
}
f(w, r)
}
}
func (g *Guard) NewToken() (tokenString string, err error) {
m := make(map[string]interface{})
m["exp"] = time.Now().Unix() + 10
return g.Encode(m)
}
func (g *Guard) Encode(claims map[string]interface{}) (tokenString string, err error) {
if !g.isActive {
return "", nil
}
t := jwt.New(jwt.GetSigningMethod("HS256"))
t.Claims = claims
return t.SignedString(g.secretKey)
}
func (g *Guard) Decode(tokenString string) (token *jwt.Token, err error) {
return jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
return g.secretKey, nil
})
}
func (g *Guard) doCheck(w http.ResponseWriter, r *http.Request) error {
if len(g.whiteList) != 0 {
host, _, err := net.SplitHostPort(r.RemoteAddr)
if err == nil {
for _, ip := range g.whiteList {
if ip == host {
return nil
}
}
}
}
if len(g.secretKey) != 0 {
// Get token from query params
tokenStr := r.URL.Query().Get("jwt")
// Get token from authorization header
if tokenStr == "" {
bearer := r.Header.Get("Authorization")
if len(bearer) > 7 && strings.ToUpper(bearer[0:6]) == "BEARER" {
tokenStr = bearer[7:]
}
}
// Get token from cookie
if tokenStr == "" {
cookie, err := r.Cookie("jwt")
if err == nil {
tokenStr = cookie.Value
}
}
if tokenStr == "" {
return ErrUnauthorized
}
// Verify the token
token, err := g.Decode(tokenStr)
if err != nil {
glog.V(1).Infof("Token verification error from %s: %v", r.RemoteAddr, err)
return ErrUnauthorized
}
if !token.Valid {
glog.V(1).Infof("Token invliad from %s: %v", r.RemoteAddr, tokenStr)
return ErrUnauthorized
}
}
glog.V(1).Infof("No permission from %s", r.RemoteAddr)
return fmt.Errorf("No write permisson from %s", r.RemoteAddr)
}
|
