feat: Request aware cookie handling (#753)
* pkg/http: Add `secureCookieFunc` field to CookieHandler. Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/http: Add `IsRequestAware` method CookieHandler. Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/http: Use `secureCookieFunc` when checking a cookie (if set). Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/http: Error on `SetCookie` if cookie handler is request aware. Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/http: Add method to set request aware cookies. Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/http: Add function to create a new request aware cookie handler. Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/client/rp: Update `trySetStateCookie` function signature. Use `SetRequestAwareCookie` if the cookie handle is request aware. This function signature can be updated because it is not exported. Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/client/rp: Add `GenerateAndStoreCodeChallengeWithRequest` function. It's not possible to add a `http.Request` argument to `GenerateAndStoreCodeChallenge` as this would be a breaking change. Instead, add a new function that accepts a request argument and call `SetRequestAwareCookie` here. Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/client/rp: Update PKCE logic to pass request if required by cookie handler. Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/http: Don't set MaxAge if cookie handler is request aware. The securecookie field can be nil. Expect the caller to set max age on the securecookie returned by the secureCookieFunc. Signed-off-by: Mark Laing <mark.laing@canonical.com> * pkg/client: Add integration tests for request aware cookie handling. Adds a new type `cookieSpec` which is accepted as an argument to `RunAuthorizationCodeFlow`. `TestRelyingPartySession` now runs with `wrapServer` true/false and with two cookie handlers, one static and one request aware. The request aware handler extracts encryption keys from a secret using a salt from a "login_id" cookie. Signed-off-by: Mark Laing <mark.laing@canonical.com> --------- Signed-off-by: Mark Laing <mark.laing@canonical.com>
This commit is contained in:
Mark Laing
GitHub
parent
21e830e275
commit
c0d0ba9b0f
3 changed files with 179 additions and 22 deletions
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@ -3,6 +3,9 @@ package client_test
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import (
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"bytes"
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"context"
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"crypto/hmac"
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cryptoRand "crypto/rand"
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"crypto/sha512"
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"fmt"
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"io"
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"log/slog"
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@ -18,6 +21,8 @@ import (
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"testing"
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"time"
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"github.com/google/uuid"
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"github.com/gorilla/securecookie"
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"github.com/jeremija/gosubmit"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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@ -42,6 +47,15 @@ var Logger = slog.New(
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var CTX context.Context
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type cookieSpec struct {
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cookieHandler *httphelper.CookieHandler
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extraCookies []*http.Cookie
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}
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var defaultCookieSpec = cookieSpec{
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cookieHandler: httphelper.NewCookieHandler([]byte("test1234test1234"), []byte("test1234test1234"), httphelper.WithUnsecure()),
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}
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func TestMain(m *testing.M) {
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os.Exit(func() int {
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ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGINT)
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@ -53,14 +67,65 @@ func TestMain(m *testing.M) {
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}
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func TestRelyingPartySession(t *testing.T) {
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secret := make([]byte, 64)
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_, _ = cryptoRand.Read(secret)
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hashFunc := sha512.New
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requestAwareCookieHandler := httphelper.NewRequestAwareCookieHandler(func(r *http.Request) (*securecookie.SecureCookie, error) {
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// Expect a login ID cookie to be set.
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loginIDCookie, err := r.Cookie("login_id")
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require.NoError(t, err)
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// Login ID cookie will contain a UUID.
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loginID, err := uuid.Parse(loginIDCookie.Value)
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require.NoError(t, err)
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// Use a HMAC hash of the secret and login ID (salt).
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h := hmac.New(hashFunc, secret)
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_, err = h.Write(loginID[:])
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require.NoError(t, err)
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// Write a separator for the hash key.
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_, err = h.Write([]byte("INTEGRITY"))
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require.NoError(t, err)
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hash := h.Sum(nil) // 64 bytes
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// Write a separator for the block key.
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_, err = h.Write([]byte("ENCRYPTION"))
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require.NoError(t, err)
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block := h.Sum(nil)[:32] // Sum is 64 bytes but we only want 32 for AES-256.
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return securecookie.New(hash, block), nil
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}, httphelper.WithUnsecure())
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loginID := uuid.New()
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loginIDCookie := &http.Cookie{
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Name: "login_id",
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Value: loginID.String(),
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Secure: false,
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SameSite: http.SameSiteLaxMode,
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Path: "/",
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}
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cookieCases := []cookieSpec{
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defaultCookieSpec,
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{
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cookieHandler: requestAwareCookieHandler,
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extraCookies: []*http.Cookie{
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loginIDCookie,
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},
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},
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}
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for _, cookieCase := range cookieCases {
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for _, wrapServer := range []bool{false, true} {
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t.Run(fmt.Sprint("wrapServer ", wrapServer), func(t *testing.T) {
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testRelyingPartySession(t, wrapServer)
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t.Run(fmt.Sprint("wrapServer ", wrapServer, " requestAwareCookieHandler ", cookieCase.cookieHandler.IsRequestAware()), func(t *testing.T) {
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testRelyingPartySession(t, wrapServer, cookieCase)
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})
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}
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}
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}
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func testRelyingPartySession(t *testing.T, wrapServer bool) {
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func testRelyingPartySession(t *testing.T, wrapServer bool, cookieSpec cookieSpec) {
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t.Log("------- start example OP ------")
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targetURL := "http://local-site"
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exampleStorage := storage.NewStorage(storage.NewUserStore(targetURL))
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@ -74,7 +139,7 @@ func testRelyingPartySession(t *testing.T, wrapServer bool) {
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clientID := t.Name() + "-" + strconv.FormatInt(seed.Int63(), 25)
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t.Log("------- run authorization code flow ------")
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provider, tokens := RunAuthorizationCodeFlow(t, opServer, clientID, "secret")
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provider, tokens := RunAuthorizationCodeFlow(t, opServer, clientID, "secret", cookieSpec)
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t.Log("------- refresh tokens ------")
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@ -220,7 +285,7 @@ func testResourceServerTokenExchange(t *testing.T, wrapServer bool) {
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clientSecret := "secret"
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t.Log("------- run authorization code flow ------")
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provider, tokens := RunAuthorizationCodeFlow(t, opServer, clientID, clientSecret)
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provider, tokens := RunAuthorizationCodeFlow(t, opServer, clientID, clientSecret, defaultCookieSpec)
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resourceServer, err := rs.NewResourceServerClientCredentials(CTX, opServer.URL, clientID, clientSecret)
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require.NoError(t, err, "new resource server")
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@ -275,7 +340,7 @@ func testResourceServerTokenExchange(t *testing.T, wrapServer bool) {
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require.Nil(t, tokenExchangeResponse, "token exchange response")
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}
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func RunAuthorizationCodeFlow(t *testing.T, opServer *httptest.Server, clientID, clientSecret string) (provider rp.RelyingParty, tokens *oidc.Tokens[*oidc.IDTokenClaims]) {
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func RunAuthorizationCodeFlow(t *testing.T, opServer *httptest.Server, clientID, clientSecret string, cookieSpec cookieSpec) (provider rp.RelyingParty, tokens *oidc.Tokens[*oidc.IDTokenClaims]) {
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targetURL := "http://local-site"
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localURL, err := url.Parse(targetURL + "/login?requestID=1234")
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require.NoError(t, err, "local url")
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@ -294,8 +359,6 @@ func RunAuthorizationCodeFlow(t *testing.T, opServer *httptest.Server, clientID,
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}
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t.Log("------- create RP ------")
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key := []byte("test1234test1234")
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cookieHandler := httphelper.NewCookieHandler(key, key, httphelper.WithUnsecure())
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provider, err = rp.NewRelyingPartyOIDC(
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CTX,
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opServer.URL,
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@ -303,7 +366,7 @@ func RunAuthorizationCodeFlow(t *testing.T, opServer *httptest.Server, clientID,
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clientSecret,
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targetURL,
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[]string{"openid", "email", "profile", "offline_access"},
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rp.WithPKCE(cookieHandler),
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rp.WithPKCE(cookieSpec.cookieHandler),
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rp.WithAuthStyle(oauth2.AuthStyleInHeader),
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rp.WithVerifierOpts(
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rp.WithIssuedAtOffset(5*time.Second),
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@ -317,6 +380,11 @@ func RunAuthorizationCodeFlow(t *testing.T, opServer *httptest.Server, clientID,
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state := "state-" + strconv.FormatInt(seed.Int63(), 25)
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capturedW := httptest.NewRecorder()
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get := httptest.NewRequest("GET", localURL.String(), nil)
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for _, cookie := range cookieSpec.extraCookies {
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get.AddCookie(cookie)
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http.SetCookie(capturedW, cookie)
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}
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rp.AuthURLHandler(func() string { return state }, provider,
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rp.WithPromptURLParam("Hello, World!", "Goodbye, World!"),
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rp.WithURLParam("custom", "param"),
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@ -410,12 +410,19 @@ func AuthURLHandler(stateFn func() string, rp RelyingParty, urlParam ...URLParam
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}
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state := stateFn()
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if err := trySetStateCookie(w, state, rp); err != nil {
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if err := trySetStateCookie(r, w, state, rp); err != nil {
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unauthorizedError(w, r, "failed to create state cookie: "+err.Error(), state, rp)
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return
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}
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if rp.IsPKCE() {
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codeChallenge, err := GenerateAndStoreCodeChallenge(w, rp)
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var codeChallenge string
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var err error
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if rp.CookieHandler().IsRequestAware() {
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codeChallenge, err = GenerateAndStoreCodeChallengeWithRequest(r, w, rp)
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} else {
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codeChallenge, err = GenerateAndStoreCodeChallenge(w, rp)
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}
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if err != nil {
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unauthorizedError(w, r, "failed to create code challenge: "+err.Error(), state, rp)
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return
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@ -436,6 +443,15 @@ func GenerateAndStoreCodeChallenge(w http.ResponseWriter, rp RelyingParty) (stri
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return oidc.NewSHACodeChallenge(codeVerifier), nil
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}
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// GenerateAndStoreCodeChallenge generates a PKCE code challenge and stores its verifier into a secure cookie
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func GenerateAndStoreCodeChallengeWithRequest(r *http.Request, w http.ResponseWriter, rp RelyingParty) (string, error) {
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codeVerifier := base64.RawURLEncoding.EncodeToString([]byte(uuid.New().String()))
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if err := rp.CookieHandler().SetRequestAwareCookie(r, w, pkceCode, codeVerifier); err != nil {
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return "", err
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}
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return oidc.NewSHACodeChallenge(codeVerifier), nil
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}
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// ErrMissingIDToken is returned when an id_token was expected,
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// but not received in the token response.
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var ErrMissingIDToken = errors.New("id_token missing")
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@ -607,9 +623,16 @@ func Userinfo[U SubjectGetter](ctx context.Context, token, tokenType, subject st
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return userinfo, nil
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}
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func trySetStateCookie(w http.ResponseWriter, state string, rp RelyingParty) error {
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func trySetStateCookie(r *http.Request, w http.ResponseWriter, state string, rp RelyingParty) error {
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if rp.CookieHandler() != nil {
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if err := rp.CookieHandler().SetCookie(w, stateParam, state); err != nil {
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var err error
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if rp.CookieHandler().IsRequestAware() {
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err = rp.CookieHandler().SetRequestAwareCookie(r, w, stateParam, state)
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} else {
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err = rp.CookieHandler().SetCookie(w, stateParam, state)
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}
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if err != nil {
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return err
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}
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}
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@ -9,6 +9,7 @@ import (
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type CookieHandler struct {
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securecookie *securecookie.SecureCookie
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secureCookieFunc func(r *http.Request) (*securecookie.SecureCookie, error)
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secureOnly bool
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sameSite http.SameSite
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maxAge int
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@ -30,6 +31,21 @@ func NewCookieHandler(hashKey, encryptKey []byte, opts ...CookieHandlerOpt) *Coo
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return c
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}
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func NewRequestAwareCookieHandler(secureCookieFunc func(r *http.Request) (*securecookie.SecureCookie, error), opts ...CookieHandlerOpt) *CookieHandler {
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c := &CookieHandler{
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secureCookieFunc: secureCookieFunc,
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secureOnly: true,
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sameSite: http.SameSiteLaxMode,
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path: "/",
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}
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for _, opt := range opts {
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opt(c)
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}
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return c
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}
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type CookieHandlerOpt func(*CookieHandler)
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func WithUnsecure() CookieHandlerOpt {
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@ -47,6 +63,10 @@ func WithSameSite(sameSite http.SameSite) CookieHandlerOpt {
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func WithMaxAge(maxAge int) CookieHandlerOpt {
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return func(c *CookieHandler) {
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c.maxAge = maxAge
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if c.IsRequestAware() {
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return
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}
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c.securecookie.MaxAge(maxAge)
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}
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}
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@ -68,8 +88,17 @@ func (c *CookieHandler) CheckCookie(r *http.Request, name string) (string, error
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if err != nil {
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return "", err
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}
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secureCookie := c.securecookie
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if c.IsRequestAware() {
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secureCookie, err = c.secureCookieFunc(r)
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if err != nil {
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return "", err
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}
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}
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var value string
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if err := c.securecookie.Decode(name, cookie.Value, &value); err != nil {
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if err := secureCookie.Decode(name, cookie.Value, &value); err != nil {
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return "", err
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}
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return value, nil
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@ -87,6 +116,10 @@ func (c *CookieHandler) CheckQueryCookie(r *http.Request, name string) (string,
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}
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func (c *CookieHandler) SetCookie(w http.ResponseWriter, name, value string) error {
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if c.IsRequestAware() {
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return errors.New("Cookie handler is request aware")
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}
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encoded, err := c.securecookie.Encode(name, value)
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if err != nil {
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return err
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@ -104,6 +137,35 @@ func (c *CookieHandler) SetCookie(w http.ResponseWriter, name, value string) err
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return nil
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}
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func (c *CookieHandler) SetRequestAwareCookie(r *http.Request, w http.ResponseWriter, name string, value string) error {
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if !c.IsRequestAware() {
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return errors.New("Cookie handler is not request aware")
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}
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secureCookie, err := c.secureCookieFunc(r)
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if err != nil {
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return err
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}
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encoded, err := secureCookie.Encode(name, value)
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if err != nil {
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return err
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}
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http.SetCookie(w, &http.Cookie{
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Name: name,
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Value: encoded,
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Domain: c.domain,
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Path: c.path,
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MaxAge: c.maxAge,
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HttpOnly: true,
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Secure: c.secureOnly,
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SameSite: c.sameSite,
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})
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return nil
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}
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func (c *CookieHandler) DeleteCookie(w http.ResponseWriter, name string) {
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http.SetCookie(w, &http.Cookie{
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Name: name,
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@ -116,3 +178,7 @@ func (c *CookieHandler) DeleteCookie(w http.ResponseWriter, name string) {
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SameSite: c.sameSite,
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})
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}
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func (c *CookieHandler) IsRequestAware() bool {
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return c.secureCookieFunc != nil
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}
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