/
proxy_handlers.go
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/
proxy_handlers.go
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// Copyright 2016 CoreOS, Inc
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package jwt
import (
"errors"
"fmt"
"net"
"net/http"
"net/url"
"strings"
"github.com/coreos/goproxy"
log "github.com/sirupsen/logrus"
"github.com/quay/jwtproxy/config"
"github.com/quay/jwtproxy/jwt/claims"
"github.com/quay/jwtproxy/jwt/keyserver"
"github.com/quay/jwtproxy/jwt/noncestorage"
"github.com/quay/jwtproxy/jwt/privatekey"
"github.com/quay/jwtproxy/proxy"
"github.com/quay/jwtproxy/stop"
)
type StoppableProxyHandler struct {
proxy.Handler
stopFunc func() <-chan struct{}
}
func NewJWTSignerHandler(cfg config.SignerConfig) (*StoppableProxyHandler, error) {
// Verify config (required keys that have no defaults).
if cfg.PrivateKey.Type == "" {
return nil, errors.New("no private key provider specified")
}
// Get the private key that will be used for signing.
privateKeyProvider, err := privatekey.New(cfg.PrivateKey, cfg.SignerParams)
if err != nil {
return nil, err
}
// Create a proxy.Handler that will add a JWT to http.Requests.
handler := func(r *http.Request, ctx *goproxy.ProxyCtx) (*http.Request, *http.Response) {
privateKey, err := privateKeyProvider.GetPrivateKey()
if err != nil {
return r, errorResponse(r, err)
}
if err := Sign(r, privateKey, cfg.SignerParams); err != nil {
return r, errorResponse(r, err)
}
return r, nil
}
return &StoppableProxyHandler{
Handler: handler,
stopFunc: privateKeyProvider.Stop,
}, nil
}
func NewJWTVerifierHandler(cfg config.VerifierConfig) (*StoppableProxyHandler, error) {
// Verify config (required keys that have no defaults).
if cfg.Upstream.URL == nil {
return nil, errors.New("no upstream specified")
}
if cfg.Audience.URL == nil {
return nil, errors.New("no audience specified")
}
if cfg.KeyServer.Type == "" {
return nil, errors.New("no key server specified")
}
stopper := stop.NewGroup()
// Create a KeyServer that will provide public keys for signature verification.
keyServer, err := keyserver.NewReader(cfg.KeyServer)
if err != nil {
return nil, err
}
stopper.Add(keyServer)
// Create a NonceStorage that will create nonces for signing.
nonceStorage, err := noncestorage.New(cfg.NonceStorage)
if err != nil {
return nil, err
}
stopper.Add(nonceStorage)
// Create an appropriate routing policy.
route := newRouter(cfg.Upstream.URL)
// Create the required list of claims.Verifier.
var claimsVerifiers []claims.Verifier
if cfg.ClaimsVerifiers != nil {
claimsVerifiers = make([]claims.Verifier, 0, len(cfg.ClaimsVerifiers))
for _, verifierConfig := range cfg.ClaimsVerifiers {
verifier, err := claims.New(verifierConfig)
if err != nil {
return nil, fmt.Errorf("could not instantiate claim verifier: %s", err)
}
stopper.Add(verifier)
claimsVerifiers = append(claimsVerifiers, verifier)
}
} else {
log.Info("No claims verifiers specified, upstream should be configured to verify authorization")
}
// Create a reverse proxy.Handler that will verify JWT from http.Requests.
handler := func(r *http.Request, ctx *goproxy.ProxyCtx) (*http.Request, *http.Response) {
signedClaims, err := Verify(r, keyServer, nonceStorage, cfg.Audience.URL, cfg.MaxSkew, cfg.MaxTTL)
if err != nil {
return r, goproxy.NewResponse(r, goproxy.ContentTypeText, http.StatusForbidden, fmt.Sprintf("jwtproxy: unable to verify request: %s", err))
}
// Run through the claims verifiers.
for _, verifier := range claimsVerifiers {
err := verifier.Handle(r, signedClaims)
if err != nil {
return r, goproxy.NewResponse(r, goproxy.ContentTypeText, http.StatusForbidden, fmt.Sprintf("Error verifying claims: %s", err))
}
}
// Route the request to upstream.
route(r, ctx)
return r, nil
}
return &StoppableProxyHandler{
Handler: handler,
stopFunc: stopper.Stop,
}, nil
}
func (sph *StoppableProxyHandler) Stop() <-chan struct{} {
return sph.stopFunc()
}
func errorResponse(r *http.Request, err error) *http.Response {
return goproxy.NewResponse(r, goproxy.ContentTypeText, http.StatusBadGateway, fmt.Sprintf("jwtproxy: unable to sign request: %s", err))
}
type router func(r *http.Request, ctx *goproxy.ProxyCtx)
func newRouter(upstream *url.URL) router {
if strings.HasPrefix(upstream.String(), "unix:") {
// Upstream is an UNIX socket.
// - Use a goproxy.RoundTripper that has an "unix" net.Dial.
// - Rewrite the request's scheme to be "http" and the host to be the encoded path to the
// socket.
sockPath := strings.TrimPrefix(upstream.String(), "unix:")
roundTripper := newUnixRoundTripper(sockPath)
return func(r *http.Request, ctx *goproxy.ProxyCtx) {
ctx.RoundTripper = roundTripper
r.URL.Scheme = "http"
r.URL.Host = sockPath
}
}
// Upstream is an HTTP or HTTPS endpoint.
// - Set the request's scheme and host to the upstream ones.
// - Prepend the request's path with the upstream path.
// - Merge query values from request and upstream.
return func(r *http.Request, ctx *goproxy.ProxyCtx) {
r.URL.Scheme = upstream.Scheme
r.URL.Host = upstream.Host
r.URL.Path = singleJoiningSlash(upstream.Path, r.URL.Path)
upstreamQuery := upstream.RawQuery
if upstreamQuery == "" || r.URL.RawQuery == "" {
r.URL.RawQuery = upstreamQuery + r.URL.RawQuery
} else {
r.URL.RawQuery = upstreamQuery + "&" + r.URL.RawQuery
}
}
}
func singleJoiningSlash(a, b string) string {
aslash := strings.HasSuffix(a, "/")
bslash := strings.HasPrefix(b, "/")
switch {
case aslash && bslash:
return a + b[1:]
case !aslash && !bslash:
return a + "/" + b
}
return a + b
}
type unixRoundTripper struct {
*http.Transport
}
func newUnixRoundTripper(sockPath string) *unixRoundTripper {
dialer := func(network, addr string) (net.Conn, error) {
return net.Dial("unix", sockPath)
}
return &unixRoundTripper{
Transport: &http.Transport{Dial: dialer},
}
}
func (urt *unixRoundTripper) RoundTrip(req *http.Request, ctx *goproxy.ProxyCtx) (*http.Response, error) {
return urt.Transport.RoundTrip(req)
}