mirror of
https://github.com/seaweedfs/seaweedfs.git
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138 lines
3.4 KiB
Go
138 lines
3.4 KiB
Go
package security
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import (
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"errors"
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"net"
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"net/http"
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"strings"
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)
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var (
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ErrUnauthorized = errors.New("unauthorized token")
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)
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/*
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Guard is to ensure data access security.
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There are 2 ways to check access:
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1. white list. It's checking request ip address.
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2. JSON Web Token(JWT) generated from secretKey.
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The jwt can come from:
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1. url parameter jwt=...
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2. request header "Authorization"
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3. cookie with the name "jwt"
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The white list is checked first because it is easy.
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Then the JWT is checked.
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The Guard will also check these claims if provided:
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1. "exp" Expiration Time
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2. "nbf" Not Before
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Generating JWT:
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1. use HS256 to sign
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2. optionally set "exp", "nbf" fields, in Unix time,
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the number of seconds elapsed since January 1, 1970 UTC.
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Referenced:
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https://github.com/pkieltyka/jwtauth/blob/master/jwtauth.go
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*/
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type Guard struct {
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whiteListIp map[string]struct{}
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whiteListCIDR map[string]*net.IPNet
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SigningKey SigningKey
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ExpiresAfterSec int
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ReadSigningKey SigningKey
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ReadExpiresAfterSec int
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isWriteActive bool
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isEmptyWhiteList bool
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}
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func NewGuard(whiteList []string, signingKey string, expiresAfterSec int, readSigningKey string, readExpiresAfterSec int) *Guard {
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g := &Guard{
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SigningKey: SigningKey(signingKey),
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ExpiresAfterSec: expiresAfterSec,
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ReadSigningKey: SigningKey(readSigningKey),
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ReadExpiresAfterSec: readExpiresAfterSec,
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}
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g.UpdateWhiteList(whiteList)
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return g
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}
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func (g *Guard) WhiteList(f http.HandlerFunc) http.HandlerFunc {
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if !g.isWriteActive {
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//if no security needed, just skip all checking
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return f
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}
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return func(w http.ResponseWriter, r *http.Request) {
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if err := g.checkWhiteList(w, r); err != nil {
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w.WriteHeader(http.StatusUnauthorized)
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return
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}
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f(w, r)
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}
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}
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func GetActualRemoteHost(r *http.Request) (host string, err error) {
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host = r.Header.Get("HTTP_X_FORWARDED_FOR")
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if host == "" {
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host = r.Header.Get("X-FORWARDED-FOR")
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}
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if strings.Contains(host, ",") {
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host = host[0:strings.Index(host, ",")]
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}
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if host == "" {
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host, _, err = net.SplitHostPort(r.RemoteAddr)
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}
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return
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}
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func (g *Guard) checkWhiteList(w http.ResponseWriter, r *http.Request) error {
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if g.isEmptyWhiteList {
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return nil
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}
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host, err := GetActualRemoteHost(r)
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if err != nil {
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return fmt.Errorf("get actual remote host %s in checkWhiteList failed: %v", r.RemoteAddr, err)
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}
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if _, ok := g.whiteListIp[host]; ok {
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return nil
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}
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for _, cidrnet := range g.whiteListCIDR {
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// If the whitelist entry contains a "/" it
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// is a CIDR range, and we should check the
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remote := net.ParseIP(host)
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if cidrnet.Contains(remote) {
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return nil
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}
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}
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glog.V(0).Infof("Not in whitelist: %s", r.RemoteAddr)
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return fmt.Errorf("Not in whitelist: %s", r.RemoteAddr)
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}
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func (g *Guard) UpdateWhiteList(whiteList []string) {
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whiteListIp := make(map[string]struct{})
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whiteListCIDR := make(map[string]*net.IPNet)
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for _, ip := range whiteList {
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if strings.Contains(ip, "/") {
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_, cidrnet, err := net.ParseCIDR(ip)
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if err != nil {
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glog.Errorf("Parse CIDR %s in whitelist failed: %v", ip, err)
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}
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whiteListCIDR[ip] = cidrnet
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} else {
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whiteListIp[ip] = struct{}{}
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}
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}
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g.isEmptyWhiteList = len(whiteListIp) == 0 && len(whiteListCIDR) == 0
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g.isWriteActive = !g.isEmptyWhiteList || len(g.SigningKey) != 0
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g.whiteListIp = whiteListIp
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g.whiteListCIDR = whiteListCIDR
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}
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