server_test.go

/*
Copyright 2015 All rights reserved.
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 main

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"net/http/httptest"
	"net/url"
	"strings"
	"testing"
	"time"

	"github.com/gambol99/go-oidc/jose"
	"github.com/stretchr/testify/assert"
)

const (
	fakeAdminRole          = "role:admin"
	fakeAdminRoleURL       = "/admin*"
	fakeAuthAllURL         = "/auth_all/*"
	fakeClientID           = "test"
	fakeSecret             = "test"
	fakeTestAdminRolesURL  = "/test_admin_roles"
	fakeTestRole           = "role:test"
	fakeTestRoleURL        = "/test_role"
	fakeTestWhitelistedURL = "/auth_all/white_listed*"
	testProxyAccepted      = "Proxy-Accepted"
	validUsername          = "test"
	validPassword          = "test"
)

var (
	defaultTestTokenClaims = jose.Claims{
		"aud":                "test",
		"azp":                "clientid",
		"client_session":     "f0105893-369a-46bc-9661-ad8c747b1a69",
		"email":              "gambol99@gmail.com",
		"family_name":        "Jayawardene",
		"given_name":         "Rohith",
		"iat":                "1450372669",
		"iss":                "test",
		"jti":                "4ee75b8e-3ee6-4382-92d4-3390b4b4937b",
		"name":               "Rohith Jayawardene",
		"nbf":                0,
		"preferred_username": "rjayawardene",
		"session_state":      "98f4c3d2-1b8c-4932-b8c4-92ec0ea7e195",
		"sub":                "1e11e539-8256-4b3b-bda8-cc0d56cddb48",
		"typ":                "Bearer",
	}
)

func TestNewKeycloakProxy(t *testing.T) {
	cfg := newFakeKeycloakConfig()
	cfg.DiscoveryURL = newFakeAuthServer().getLocation()
	cfg.Listen = "127.0.0.1:0"
	cfg.ListenHTTP = ""

	proxy, err := newProxy(cfg)
	assert.NoError(t, err)
	assert.NotNil(t, proxy)
	assert.NotNil(t, proxy.config)
	assert.NotNil(t, proxy.router)
	assert.NotNil(t, proxy.endpoint)
	assert.NoError(t, proxy.Run())
}

func TestReverseProxyHeaders(t *testing.T) {
	p := newFakeProxy(nil)
	token := newTestToken(p.idp.getLocation())
	token.addRealmRoles([]string{fakeAdminRole})
	signed, _ := p.idp.signToken(token.claims)
	requests := []fakeRequest{
		{
			URI:           "/auth_all/test",
			RawToken:      signed.Encode(),
			ExpectedProxy: true,
			ExpectedProxyHeaders: map[string]string{
				"X-Auth-Email":    "gambol99@gmail.com",
				"X-Auth-Roles":    "role:admin",
				"X-Auth-Subject":  token.claims["sub"].(string),
				"X-Auth-Token":    signed.Encode(),
				"X-Auth-Userid":   "rjayawardene",
				"X-Auth-Username": "rjayawardene",
			},
			ExpectedCode: http.StatusOK,
		},
	}
	p.RunTests(t, requests)
}

func TestForwardingProxy(t *testing.T) {
	cfg := newFakeKeycloakConfig()
	cfg.EnableForwarding = true
	cfg.ForwardingDomains = []string{}
	cfg.ForwardingUsername = "test"
	cfg.ForwardingPassword = "test"
	s := httptest.NewServer(&fakeUpstreamService{})
	requests := []fakeRequest{
		{
			URL:                     s.URL + "/test",
			ProxyRequest:            true,
			ExpectedProxy:           true,
			ExpectedCode:            http.StatusOK,
			ExpectedContentContains: "Bearer ey",
		},
	}
	p := newFakeProxy(cfg)
	<-time.After(time.Duration(100) * time.Millisecond)
	p.RunTests(t, requests)
}

func TestForbiddenTemplate(t *testing.T) {
	cfg := newFakeKeycloakConfig()
	cfg.ForbiddenPage = "templates/forbidden.html.tmpl"
	cfg.Resources = []*Resource{
		{
			URL:     "/*",
			Methods: allHTTPMethods,
			Roles:   []string{fakeAdminRole},
		},
	}
	requests := []fakeRequest{
		{
			URI:                     "/test",
			Redirects:               false,
			HasToken:                true,
			ExpectedCode:            http.StatusForbidden,
			ExpectedContentContains: "403 Permission Denied",
		},
	}
	newFakeProxy(cfg).RunTests(t, requests)
}

func TestAudienceHeader(t *testing.T) {
	c := newFakeKeycloakConfig()
	c.NoRedirects = false
	requests := []fakeRequest{
		{
			URI:           "/auth_all/test",
			HasLogin:      true,
			ExpectedProxy: true,
			Redirects:     true,
			ExpectedProxyHeaders: map[string]string{
				"X-Auth-Audience": "test",
			},
			ExpectedCode: http.StatusOK,
		},
	}
	newFakeProxy(c).RunTests(t, requests)
}

func TestDefaultDenial(t *testing.T) {
	config := newFakeKeycloakConfig()
	config.EnableDefaultDeny = true
	config.Resources = []*Resource{
		{
			URL:         "/public/*",
			Methods:     allHTTPMethods,
			WhiteListed: true,
		},
	}
	requests := []fakeRequest{
		{
			URI:           "/public/allowed",
			ExpectedProxy: true,
			ExpectedCode:  http.StatusOK,
		},
		{
			URI:          "/not_permited",
			Redirects:    false,
			ExpectedCode: http.StatusUnauthorized,
		},
	}
	newFakeProxy(config).RunTests(t, requests)
}

func TestAuthorizationTemplate(t *testing.T) {
	cfg := newFakeKeycloakConfig()
	cfg.SignInPage = "templates/sign_in.html.tmpl"
	cfg.Resources = []*Resource{
		{
			URL:     "/*",
			Methods: allHTTPMethods,
			Roles:   []string{fakeAdminRole},
		},
	}
	requests := []fakeRequest{
		{
			URI:                     cfg.WithOAuthURI(authorizationURL),
			Redirects:               true,
			ExpectedCode:            http.StatusOK,
			ExpectedContentContains: "Sign In",
		},
	}
	newFakeProxy(cfg).RunTests(t, requests)
}

func TestProxyProtocol(t *testing.T) {
	c := newFakeKeycloakConfig()
	c.EnableProxyProtocol = true
	requests := []fakeRequest{
		{
			URI:           fakeAuthAllURL + "/test",
			HasToken:      true,
			ExpectedProxy: true,
			ExpectedProxyHeaders: map[string]string{
				"X-Forwarded-For": "127.0.0.1",
			},
			ExpectedCode: http.StatusOK,
		},
		{
			URI:           fakeAuthAllURL + "/test",
			HasToken:      true,
			ProxyProtocol: "189.10.10.1",
			ExpectedProxy: true,
			ExpectedProxyHeaders: map[string]string{
				"X-Forwarded-For": "189.10.10.1",
			},
			ExpectedCode: http.StatusOK,
		},
	}
	newFakeProxy(c).RunTests(t, requests)
}

func TestTokenEncryption(t *testing.T) {
	c := newFakeKeycloakConfig()
	c.EnableEncryptedToken = true
	c.EncryptionKey = "US36S5kubc4BXbfzCIKTQcTzG6lvixVv"
	requests := []fakeRequest{
		{
			URI:           "/auth_all/test",
			HasLogin:      true,
			ExpectedProxy: true,
			Redirects:     true,
			ExpectedProxyHeaders: map[string]string{
				"X-Auth-Email":    "gambol99@gmail.com",
				"X-Auth-Userid":   "rjayawardene",
				"X-Auth-Username": "rjayawardene",
				"X-Forwarded-For": "127.0.0.1",
			},
			ExpectedCode: http.StatusOK,
		},
		// the token must be encrypted
		{
			URI:          "/auth_all/test",
			HasToken:     true,
			ExpectedCode: http.StatusUnauthorized,
		},
	}
	newFakeProxy(c).RunTests(t, requests)
}

func TestCustomResponseHeaders(t *testing.T) {
	c := newFakeKeycloakConfig()
	c.ResponseHeaders = map[string]string{
		"CustomReponseHeader": "True",
	}
	p := newFakeProxy(c)

	requests := []fakeRequest{
		{
			URI:       "/auth_all/test",
			HasLogin:  true,
			Redirects: true,
			ExpectedHeaders: map[string]string{
				"CustomReponseHeader": "True",
			},
			ExpectedProxy: true,
			ExpectedCode:  http.StatusOK,
		},
	}
	p.RunTests(t, requests)
}

func TestSkipClientIDDisabled(t *testing.T) {
	c := newFakeKeycloakConfig()
	p := newFakeProxy(c)
	// create two token, one with a bad client id
	bad := newTestToken(p.idp.getLocation())
	bad.merge(jose.Claims{"aud": "bad_client_id"})
	badSigned, _ := p.idp.signToken(bad.claims)
	// and the good
	good := newTestToken(p.idp.getLocation())
	goodSigned, _ := p.idp.signToken(good.claims)
	requests := []fakeRequest{
		{
			URI:           "/auth_all/test",
			RawToken:      goodSigned.Encode(),
			ExpectedProxy: true,
			ExpectedCode:  http.StatusOK,
		},
		{
			URI:          "/auth_all/test",
			RawToken:     badSigned.Encode(),
			ExpectedCode: http.StatusForbidden,
		},
	}
	p.RunTests(t, requests)
}

func TestSkipClientIDEnabled(t *testing.T) {
	c := newFakeKeycloakConfig()
	c.SkipClientID = true
	p := newFakeProxy(c)
	// create two token, one with a bad client id
	bad := newTestToken(p.idp.getLocation())
	bad.merge(jose.Claims{"aud": "bad_client_id"})
	badSigned, _ := p.idp.signToken(bad.claims)
	// and the good
	good := newTestToken(p.idp.getLocation())
	goodSigned, _ := p.idp.signToken(good.claims)
	// bad issuer
	badIssurer := newTestToken("http://someone_else")
	badIssurer.merge(jose.Claims{"aud": "bad_client_id"})
	badIssuerSigned, _ := p.idp.signToken(badIssurer.claims)

	requests := []fakeRequest{
		{
			URI:           "/auth_all/test",
			RawToken:      goodSigned.Encode(),
			ExpectedProxy: true,
			ExpectedCode:  http.StatusOK,
		},
		{
			URI:           "/auth_all/test",
			RawToken:      badSigned.Encode(),
			ExpectedProxy: true,
			ExpectedCode:  http.StatusOK,
		},
		{
			URI:          "/auth_all/test",
			RawToken:     badIssuerSigned.Encode(),
			ExpectedCode: http.StatusForbidden,
		},
	}
	p.RunTests(t, requests)
}

func TestAuthTokenHeaderEnabled(t *testing.T) {
	p := newFakeProxy(nil)
	token := newTestToken(p.idp.getLocation())
	signed, _ := p.idp.signToken(token.claims)

	requests := []fakeRequest{
		{
			URI:      "/auth_all/test",
			RawToken: signed.Encode(),
			ExpectedProxyHeaders: map[string]string{
				"X-Auth-Token": signed.Encode(),
			},
			ExpectedProxy: true,
			ExpectedCode:  http.StatusOK,
		},
	}
	p.RunTests(t, requests)
}

func TestAuthTokenHeaderDisabled(t *testing.T) {
	c := newFakeKeycloakConfig()
	c.EnableTokenHeader = false
	p := newFakeProxy(c)
	token := newTestToken(p.idp.getLocation())
	signed, _ := p.idp.signToken(token.claims)

	requests := []fakeRequest{
		{
			URI:      "/auth_all/test",
			RawToken: signed.Encode(),
			ExpectedProxyHeaders: map[string]string{
				"X-Auth-Token": "",
			},
			ExpectedProxy: true,
			ExpectedCode:  http.StatusOK,
		},
	}
	p.RunTests(t, requests)
}

func TestDisableAuthorizationCookie(t *testing.T) {
	c := newFakeKeycloakConfig()
	c.EnableAuthorizationCookies = false
	p := newFakeProxy(c)
	token := newTestToken(p.idp.getLocation())
	signed, _ := p.idp.signToken(token.claims)

	requests := []fakeRequest{
		{
			URI: "/auth_all/test",
			Cookies: []*http.Cookie{
				{Name: c.CookieAccessName, Value: signed.Encode()},
				{Name: "mycookie", Value: "myvalue"},
			},
			HasToken:                true,
			ExpectedContentContains: "kc-access=censored; mycookie=myvalue",
			ExpectedCode:            http.StatusOK,
			ExpectedProxy:           true,
		},
	}
	p.RunTests(t, requests)
}

func newTestService() string {
	_, _, u := newTestProxyService(nil)
	return u
}

func newTestProxyService(config *Config) (*oauthProxy, *fakeAuthServer, string) {
	auth := newFakeAuthServer()
	if config == nil {
		config = newFakeKeycloakConfig()
	}
	config.DiscoveryURL = auth.getLocation()
	config.RevocationEndpoint = auth.getRevocationURL()
	config.Verbose = false
	config.EnableLogging = false

	proxy, err := newProxy(config)
	if err != nil {
		panic("failed to create proxy service, error: " + err.Error())
	}

	// step: create an fake upstream endpoint
	proxy.upstream = new(fakeUpstreamService)
	service := httptest.NewServer(proxy.router)
	config.RedirectionURL = service.URL

	// step: we need to update the client config
	if proxy.client, proxy.idp, proxy.idpClient, err = proxy.newOpenIDClient(); err != nil {
		panic("failed to recreate the openid client, error: " + err.Error())
	}

	return proxy, auth, service.URL
}

func newFakeHTTPRequest(method, path string) *http.Request {
	return &http.Request{
		Method: method,
		Header: make(map[string][]string),
		Host:   "127.0.0.1",
		URL: &url.URL{
			Scheme: "http",
			Host:   "127.0.0.1",
			Path:   path,
		},
	}
}

func newFakeKeycloakConfig() *Config {
	return &Config{
		ClientID:                   fakeClientID,
		ClientSecret:               fakeSecret,
		CookieAccessName:           "kc-access",
		CookieRefreshName:          "kc-state",
		DisableAllLogging:          true,
		DiscoveryURL:               "127.0.0.1:0",
		EnableAuthorizationCookies: true,
		EnableAuthorizationHeader:  true,
		EnableLogging:              false,
		EnableLoginHandler:         true,
		EnableTokenHeader:          true,
		Listen:                     "127.0.0.1:0",
		OAuthURI:                   "/oauth",
		OpenIDProviderTimeout:      time.Second * 5,
		Scopes:                     []string{},
		Verbose:                    false,
		Resources: []*Resource{
			{
				URL:     fakeAdminRoleURL,
				Methods: []string{"GET"},
				Roles:   []string{fakeAdminRole},
			},
			{
				URL:     fakeTestRoleURL,
				Methods: []string{"GET"},
				Roles:   []string{fakeTestRole},
			},
			{
				URL:     fakeTestAdminRolesURL,
				Methods: []string{"GET"},
				Roles:   []string{fakeAdminRole, fakeTestRole},
			},
			{
				URL:     fakeAuthAllURL,
				Methods: allHTTPMethods,
				Roles:   []string{},
			},
			{
				URL:         fakeTestWhitelistedURL,
				WhiteListed: true,
				Methods:     allHTTPMethods,
				Roles:       []string{},
			},
		},
	}
}

func makeTestCodeFlowLogin(location string) (*http.Response, error) {
	u, err := url.Parse(location)
	if err != nil {
		return nil, err
	}
	// step: get the redirect
	var resp *http.Response
	for count := 0; count < 4; count++ {
		req, err := http.NewRequest(http.MethodGet, location, nil)
		if err != nil {
			return nil, err
		}
		// step: make the request
		resp, err = http.DefaultTransport.RoundTrip(req)
		if err != nil {
			return nil, err
		}
		if resp.StatusCode != http.StatusTemporaryRedirect {
			return nil, errors.New("no redirection found in resp")
		}
		location = resp.Header.Get("Location")
		if !strings.HasPrefix(location, "http") {
			location = fmt.Sprintf("%s://%s%s", u.Scheme, u.Host, location)
		}
	}
	return resp, nil
}

// fakeUpstreamResponse is the response from fake upstream
type fakeUpstreamResponse struct {
	URI     string      `json:"uri"`
	Method  string      `json:"method"`
	Address string      `json:"address"`
	Headers http.Header `json:"headers"`
}

// fakeUpstreamService acts as a fake upstream service, returns the headers and request
type fakeUpstreamService struct{}

func (f *fakeUpstreamService) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	w.Header().Set(testProxyAccepted, "true")
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusOK)
	content, _ := json.Marshal(&fakeUpstreamResponse{
		URI:     r.RequestURI,
		Method:  r.Method,
		Address: r.RemoteAddr,
		Headers: r.Header,
	})
	w.Write(content)
}

type fakeToken struct {
	claims jose.Claims
}

func newTestToken(issuer string) *fakeToken {
	claims := make(jose.Claims)
	for k, v := range defaultTestTokenClaims {
		claims[k] = v
	}
	claims.Add("exp", float64(time.Now().Add(1*time.Hour).Unix()))
	claims.Add("iat", float64(time.Now().Unix()))
	claims.Add("iss", issuer)

	return &fakeToken{claims: claims}
}

// merge is responsible for merging claims into the token
func (t *fakeToken) merge(claims jose.Claims) {
	for k, v := range claims {
		t.claims.Add(k, v)
	}
}

// getToken returns a JWT token from the clains
func (t *fakeToken) getToken() jose.JWT {
	tk, _ := jose.NewJWT(jose.JOSEHeader{"alg": "RS256"}, t.claims)
	return tk
}

// setExpiration sets the expiration of the token
func (t *fakeToken) setExpiration(tm time.Time) {
	t.claims.Add("exp", float64(tm.Unix()))
}

// addGroups adds groups to then token
func (t *fakeToken) addGroups(groups []string) {
	t.claims.Add("groups", groups)
}

// addRealmRoles adds realms roles to token
func (t *fakeToken) addRealmRoles(roles []string) {
	t.claims.Add("realm_access", map[string]interface{}{
		"roles": roles,
	})
}

// addClientRoles adds client roles to the token
func (t *fakeToken) addClientRoles(client string, roles []string) {
	t.claims.Add("resource_access", map[string]interface{}{
		client: map[string]interface{}{
			"roles": roles,
		},
	})
}