consul/internal/go-sso/oidcauth/oidcauthtest/testing.go

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2020-05-12 01:59:29 +00:00
// package oidcauthtest exposes tools to assist in writing unit tests of OIDC
// and JWT authentication workflows.
//
// When the package is loaded it will randomly generate an ECDSA signing
// keypair used to sign JWTs both via the Server and the SignJWT method.
package oidcauthtest
import (
"bytes"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"net/http/httptest"
"net/url"
"strconv"
"sync"
"time"
"github.com/hashicorp/consul/internal/go-sso/oidcauth/internal/strutil"
"github.com/mitchellh/go-testing-interface"
"github.com/stretchr/testify/require"
"gopkg.in/square/go-jose.v2"
"gopkg.in/square/go-jose.v2/jwt"
)
// Server is local server the mocks the endpoints used by the OIDC and
// JWKS process.
type Server struct {
httpServer *httptest.Server
caCert string
returnFunc func()
jwks *jose.JSONWebKeySet
allowedRedirectURIs []string
replySubject string
replyUserinfo map[string]interface{}
mu sync.Mutex
clientID string
clientSecret string
expectedAuthCode string
expectedAuthNonce string
customClaims map[string]interface{}
customAudience string
omitIDToken bool
disableUserInfo bool
}
type startOption struct {
port int
returnFunc func()
}
// WithPort is a option for Start that lets the caller control the port
// allocation. The returnFunc parameter is used when the provider is stopped to
// return the port in whatever bookkeeping system the caller wants to use.
func WithPort(port int, returnFunc func()) startOption {
return startOption{
port: port,
returnFunc: returnFunc,
}
}
// Start creates a disposable Server. If the port provided is
// zero it will bind to a random free port, otherwise the provided port is
// used.
func Start(t testing.T, options ...startOption) *Server {
s := &Server{
allowedRedirectURIs: []string{
"https://example.com",
},
replySubject: "r3qXcK2bix9eFECzsU3Sbmh0K16fatW6@clients",
replyUserinfo: map[string]interface{}{
"color": "red",
"temperature": "76",
"flavor": "umami",
},
}
jwks, err := newJWKS(ecdsaPublicKey)
require.NoError(t, err)
s.jwks = jwks
var (
port int
returnFunc func()
)
for _, option := range options {
if option.port > 0 {
port = option.port
returnFunc = option.returnFunc
}
}
s.httpServer = httptestNewUnstartedServerWithPort(s, port)
s.httpServer.Config.ErrorLog = log.New(ioutil.Discard, "", 0)
s.httpServer.StartTLS()
if returnFunc != nil {
t.Cleanup(returnFunc)
}
t.Cleanup(s.httpServer.Close)
cert := s.httpServer.Certificate()
var buf bytes.Buffer
require.NoError(t, pem.Encode(&buf, &pem.Block{Type: "CERTIFICATE", Bytes: cert.Raw}))
s.caCert = buf.String()
return s
}
// SetClientCreds is for configuring the client information required for the
// OIDC workflows.
func (s *Server) SetClientCreds(clientID, clientSecret string) {
s.mu.Lock()
defer s.mu.Unlock()
s.clientID = clientID
s.clientSecret = clientSecret
}
// SetExpectedAuthCode configures the auth code to return from /auth and the
// allowed auth code for /token.
func (s *Server) SetExpectedAuthCode(code string) {
s.mu.Lock()
defer s.mu.Unlock()
s.expectedAuthCode = code
}
// SetExpectedAuthNonce configures the nonce value required for /auth.
func (s *Server) SetExpectedAuthNonce(nonce string) {
s.mu.Lock()
defer s.mu.Unlock()
s.expectedAuthNonce = nonce
}
// SetAllowedRedirectURIs allows you to configure the allowed redirect URIs for
// the OIDC workflow. If not configured a sample of "https://example.com" is
// used.
func (s *Server) SetAllowedRedirectURIs(uris []string) {
s.mu.Lock()
defer s.mu.Unlock()
s.allowedRedirectURIs = uris
}
// SetCustomClaims lets you set claims to return in the JWT issued by the OIDC
// workflow.
func (s *Server) SetCustomClaims(customClaims map[string]interface{}) {
s.mu.Lock()
defer s.mu.Unlock()
s.customClaims = customClaims
}
// SetCustomAudience configures what audience value to embed in the JWT issued
// by the OIDC workflow.
func (s *Server) SetCustomAudience(customAudience string) {
s.mu.Lock()
defer s.mu.Unlock()
s.customAudience = customAudience
}
// OmitIDTokens forces an error state where the /token endpoint does not return
// id_token.
func (s *Server) OmitIDTokens() {
s.mu.Lock()
defer s.mu.Unlock()
s.omitIDToken = true
}
// DisableUserInfo makes the userinfo endpoint return 404 and omits it from the
// discovery config.
func (s *Server) DisableUserInfo() {
s.mu.Lock()
defer s.mu.Unlock()
s.disableUserInfo = true
}
// Stop stops the running Server.
func (s *Server) Stop() {
s.httpServer.Close()
}
// Addr returns the current base URL for the running webserver.
func (s *Server) Addr() string { return s.httpServer.URL }
// CACert returns the pem-encoded CA certificate used by the HTTPS server.
func (s *Server) CACert() string { return s.caCert }
// SigningKeys returns the pem-encoded keys used to sign JWTs.
func (s *Server) SigningKeys() (pub, priv string) {
return SigningKeys()
}
// ServeHTTP implements http.Handler.
func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
s.mu.Lock()
defer s.mu.Unlock()
w.Header().Set("Content-Type", "application/json")
switch req.URL.Path {
case "/.well-known/openid-configuration":
if req.Method != "GET" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
reply := struct {
Issuer string `json:"issuer"`
AuthEndpoint string `json:"authorization_endpoint"`
TokenEndpoint string `json:"token_endpoint"`
JWKSURI string `json:"jwks_uri"`
UserinfoEndpoint string `json:"userinfo_endpoint,omitempty"`
}{
Issuer: s.Addr(),
AuthEndpoint: s.Addr() + "/auth",
TokenEndpoint: s.Addr() + "/token",
JWKSURI: s.Addr() + "/certs",
UserinfoEndpoint: s.Addr() + "/userinfo",
}
if s.disableUserInfo {
reply.UserinfoEndpoint = ""
}
if err := writeJSON(w, &reply); err != nil {
return
}
case "/auth":
if req.Method != "GET" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
qv := req.URL.Query()
if qv.Get("response_type") != "code" {
writeAuthErrorResponse(w, req, "unsupported_response_type", "")
return
}
if qv.Get("scope") != "openid" {
writeAuthErrorResponse(w, req, "invalid_scope", "")
return
}
if s.expectedAuthCode == "" {
writeAuthErrorResponse(w, req, "access_denied", "")
return
}
nonce := qv.Get("nonce")
if s.expectedAuthNonce != "" && s.expectedAuthNonce != nonce {
writeAuthErrorResponse(w, req, "access_denied", "")
return
}
state := qv.Get("state")
if state == "" {
writeAuthErrorResponse(w, req, "invalid_request", "missing state parameter")
return
}
redirectURI := qv.Get("redirect_uri")
if redirectURI == "" {
writeAuthErrorResponse(w, req, "invalid_request", "missing redirect_uri parameter")
return
}
redirectURI += "?state=" + url.QueryEscape(state) +
"&code=" + url.QueryEscape(s.expectedAuthCode)
http.Redirect(w, req, redirectURI, http.StatusFound)
return
case "/certs":
if req.Method != "GET" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
if err := writeJSON(w, s.jwks); err != nil {
return
}
case "/certs_missing":
w.WriteHeader(http.StatusNotFound)
case "/certs_invalid":
w.Write([]byte("It's not a keyset!"))
case "/token":
if req.Method != "POST" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
switch {
case req.FormValue("grant_type") != "authorization_code":
_ = writeTokenErrorResponse(w, req, http.StatusBadRequest, "invalid_request", "bad grant_type")
return
case !strutil.StrListContains(s.allowedRedirectURIs, req.FormValue("redirect_uri")):
_ = writeTokenErrorResponse(w, req, http.StatusBadRequest, "invalid_request", "redirect_uri is not allowed")
return
case req.FormValue("code") != s.expectedAuthCode:
_ = writeTokenErrorResponse(w, req, http.StatusUnauthorized, "invalid_grant", "unexpected auth code")
return
}
stdClaims := jwt.Claims{
Subject: s.replySubject,
Issuer: s.Addr(),
NotBefore: jwt.NewNumericDate(time.Now().Add(-5 * time.Second)),
Expiry: jwt.NewNumericDate(time.Now().Add(5 * time.Second)),
Audience: jwt.Audience{s.clientID},
}
if s.customAudience != "" {
stdClaims.Audience = jwt.Audience{s.customAudience}
}
jwtData, err := SignJWT("", stdClaims, s.customClaims)
if err != nil {
_ = writeTokenErrorResponse(w, req, http.StatusInternalServerError, "server_error", err.Error())
return
}
reply := struct {
AccessToken string `json:"access_token"`
IDToken string `json:"id_token,omitempty"`
}{
AccessToken: jwtData,
IDToken: jwtData,
}
if s.omitIDToken {
reply.IDToken = ""
}
if err := writeJSON(w, &reply); err != nil {
return
}
case "/userinfo":
if s.disableUserInfo {
w.WriteHeader(http.StatusNotFound)
return
}
if req.Method != "GET" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
if err := writeJSON(w, s.replyUserinfo); err != nil {
return
}
default:
w.WriteHeader(http.StatusNotFound)
}
}
func writeAuthErrorResponse(w http.ResponseWriter, req *http.Request, errorCode, errorMessage string) {
qv := req.URL.Query()
redirectURI := qv.Get("redirect_uri") +
"?state=" + url.QueryEscape(qv.Get("state")) +
"&error=" + url.QueryEscape(errorCode)
if errorMessage != "" {
redirectURI += "&error_description=" + url.QueryEscape(errorMessage)
}
http.Redirect(w, req, redirectURI, http.StatusFound)
}
func writeTokenErrorResponse(w http.ResponseWriter, req *http.Request, statusCode int, errorCode, errorMessage string) error {
body := struct {
Code string `json:"error"`
Desc string `json:"error_description,omitempty"`
}{
Code: errorCode,
Desc: errorMessage,
}
w.WriteHeader(statusCode)
return writeJSON(w, &body)
}
// newJWKS converts a pem-encoded public key into JWKS data suitable for a
// verification endpoint response
func newJWKS(pubKey string) (*jose.JSONWebKeySet, error) {
block, _ := pem.Decode([]byte(pubKey))
if block == nil {
return nil, fmt.Errorf("unable to decode public key")
}
input := block.Bytes
pub, err := x509.ParsePKIXPublicKey(input)
if err != nil {
return nil, err
}
return &jose.JSONWebKeySet{
Keys: []jose.JSONWebKey{
jose.JSONWebKey{
Key: pub,
},
},
}, nil
}
func writeJSON(w http.ResponseWriter, out interface{}) error {
enc := json.NewEncoder(w)
return enc.Encode(out)
}
// SignJWT will bundle the provided claims into a signed JWT. The provided key
// is assumed to be ECDSA.
//
// If no private key is provided, the default package keys are used. These can
// be retrieved via the SigningKeys() method.
func SignJWT(privKey string, claims jwt.Claims, privateClaims interface{}) (string, error) {
if privKey == "" {
privKey = ecdsaPrivateKey
}
var key *ecdsa.PrivateKey
block, _ := pem.Decode([]byte(privKey))
if block != nil {
var err error
key, err = x509.ParseECPrivateKey(block.Bytes)
if err != nil {
return "", err
}
}
sig, err := jose.NewSigner(
jose.SigningKey{Algorithm: jose.ES256, Key: key},
(&jose.SignerOptions{}).WithType("JWT"),
)
if err != nil {
return "", err
}
raw, err := jwt.Signed(sig).
Claims(claims).
Claims(privateClaims).
CompactSerialize()
if err != nil {
return "", err
}
return raw, nil
}
// httptestNewUnstartedServerWithPort is roughly the same as
// httptest.NewUnstartedServer() but allows the caller to explicitly choose the
// port if desired.
func httptestNewUnstartedServerWithPort(handler http.Handler, port int) *httptest.Server {
if port == 0 {
return httptest.NewUnstartedServer(handler)
}
addr := net.JoinHostPort("127.0.0.1", strconv.Itoa(port))
l, err := net.Listen("tcp", addr)
if err != nil {
panic(fmt.Sprintf("httptest: failed to listen on a port: %v", err))
}
return &httptest.Server{
Listener: l,
Config: &http.Server{Handler: handler},
}
}
// SigningKeys returns the pem-encoded keys used to sign JWTs by default.
func SigningKeys() (pub, priv string) {
return ecdsaPublicKey, ecdsaPrivateKey
}
var (
ecdsaPublicKey string
ecdsaPrivateKey string
)
func init() {
// Each time we run tests we generate a unique set of keys for use in the
// test. These are cached between runs but do not persist between restarts
// of the test binary.
var err error
ecdsaPublicKey, ecdsaPrivateKey, err = GenerateKey()
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if err != nil {
panic(err)
}
}
func GenerateKey() (pub, priv string, err error) {
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privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return "", "", fmt.Errorf("error generating private key: %v", err)
}
{
derBytes, err := x509.MarshalECPrivateKey(privateKey)
if err != nil {
return "", "", fmt.Errorf("error marshaling private key: %v", err)
}
pemBlock := &pem.Block{
Type: "EC PRIVATE KEY",
Bytes: derBytes,
}
priv = string(pem.EncodeToMemory(pemBlock))
}
{
derBytes, err := x509.MarshalPKIXPublicKey(privateKey.Public())
if err != nil {
return "", "", fmt.Errorf("error marshaling public key: %v", err)
}
pemBlock := &pem.Block{
Type: "PUBLIC KEY",
Bytes: derBytes,
}
pub = string(pem.EncodeToMemory(pemBlock))
}
return pub, priv, nil
}