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auth_handler.go: Ignore invalid CSRF cookies rather than return error

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Generate a new cookie for the user and move on as if they had not sent
a bad cookie. Hopefully this will make the user experience better if,
for example, the server rotated cookie signing keys and then a user
submitted a very old cookie.

Signed-off-by: Andrew Keesler <akeesler@vmware.com>
This commit is contained in:
Ryan Richard 2020-11-20 13:56:35 -08:00 committed by Andrew Keesler
parent b21f0035d7
commit c4ff1ca304
2 changed files with 42 additions and 29 deletions
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17
internal/oidc/auth/auth_handler.go
View File

@ -41,11 +41,7 @@ func NewHandler(
return httperr.Newf(http.StatusMethodNotAllowed, "%s (try GET or POST)", r.Method)
}
csrfFromCookie, err := readCSRFCookie(r, cookieCodec)
if err != nil {
plog.InfoErr("error reading CSRF cookie", err)
return err
}
csrfFromCookie := readCSRFCookie(r, cookieCodec)
authorizeRequester, err := oauthHelper.NewAuthorizeRequest(r.Context(), r)
if err != nil {
@ -133,20 +129,23 @@ func NewHandler(
})
}
func readCSRFCookie(r *http.Request, codec oidc.Codec) (csrftoken.CSRFToken, error) {
func readCSRFCookie(r *http.Request, codec oidc.Codec) csrftoken.CSRFToken {
receivedCSRFCookie, err := r.Cookie(oidc.CSRFCookieName)
if err != nil {
// Error means that the cookie was not found
return "", nil
return ""
}
var csrfFromCookie csrftoken.CSRFToken
err = codec.Decode(oidc.CSRFCookieEncodingName, receivedCSRFCookie.Value, &csrfFromCookie)
if err != nil {
return "", httperr.Wrap(http.StatusUnprocessableEntity, "error reading CSRF cookie", err)
// We can ignore any errors and just make a new cookie. Hopefully this will
// make the user experience better if, for example, the server rotated
// cookie signing keys and then a user submitted a very old cookie.
return ""
}
return csrfFromCookie, nil
return csrfFromCookie
}
func grantOpenIDScopeIfRequested(authorizeRequester fosite.AuthorizeRequester) {

54
internal/oidc/auth/auth_handler_test.go
View File

@ -328,6 +328,26 @@ func TestAuthorizationEndpoint(t *testing.T) {
wantLocationHeader: expectedRedirectLocation(expectedUpstreamStateParam(nil, "", "")),
wantUpstreamStateParamInLocationHeader: true,
},
{
name: "error while decoding CSRF cookie just generates a new cookie and succeeds as usual",
issuer: downstreamIssuer,
idpListGetter: oidctestutil.NewIDPListGetter(&upstreamOIDCIdentityProvider),
generateCSRF: happyCSRFGenerator,
generatePKCE: happyPKCEGenerator,
generateNonce: happyNonceGenerator,
stateEncoder: happyStateEncoder,
cookieEncoder: happyCookieEncoder,
method: http.MethodGet,
path: happyGetRequestPath,
csrfCookie: "__Host-pinniped-csrf=this-value-was-not-signed-by-pinniped",
wantStatus: http.StatusFound,
wantContentType: "text/html; charset=utf-8",
// Generated a new CSRF cookie and set it in the response.
wantCSRFValueInCookieHeader: happyCSRF,
wantLocationHeader: expectedRedirectLocation(expectedUpstreamStateParam(nil, "", "")),
wantUpstreamStateParamInLocationHeader: true,
wantBodyStringWithLocationInHref: true,
},
{
name: "happy path when downstream redirect uri matches what is configured for client except for the port number",
issuer: downstreamIssuer,
@ -639,22 +659,6 @@ func TestAuthorizationEndpoint(t *testing.T) {
wantContentType: "text/plain; charset=utf-8",
wantBodyString: "Internal Server Error: error generating PKCE param\n",
},
{
name: "error while decoding CSRF cookie",
issuer: downstreamIssuer,
idpListGetter: oidctestutil.NewIDPListGetter(&upstreamOIDCIdentityProvider),
generateCSRF: happyCSRFGenerator,
generatePKCE: happyPKCEGenerator,
generateNonce: happyNonceGenerator,
stateEncoder: happyStateEncoder,
cookieEncoder: happyCookieEncoder,
method: http.MethodGet,
path: happyGetRequestPath,
csrfCookie: "__Host-pinniped-csrf=this-value-was-not-signed-by-pinniped",
wantStatus: http.StatusUnprocessableEntity,
wantContentType: "text/plain; charset=utf-8",
wantBodyString: "Unprocessable Entity: error reading CSRF cookie\n",
},
{
name: "no upstream providers are configured",
issuer: downstreamIssuer,
@ -864,10 +868,20 @@ func requireEqualURLs(t *testing.T, actualURL string, expectedURL string, ignore
require.NoError(t, err)
expectedLocationURL, err := url.Parse(expectedURL)
require.NoError(t, err)
require.Equal(t, expectedLocationURL.Scheme, actualLocationURL.Scheme)
require.Equal(t, expectedLocationURL.User, actualLocationURL.User)
require.Equal(t, expectedLocationURL.Host, actualLocationURL.Host)
require.Equal(t, expectedLocationURL.Path, actualLocationURL.Path)
require.Equal(t, expectedLocationURL.Scheme, actualLocationURL.Scheme,
"schemes were not equal: expected %s but got %s", expectedURL, actualURL,
)
require.Equal(t, expectedLocationURL.User, actualLocationURL.User,
"users were not equal: expected %s but got %s", expectedURL, actualURL,
)
require.Equal(t, expectedLocationURL.Host, actualLocationURL.Host,
"hosts were not equal: expected %s but got %s", expectedURL, actualURL,
)
require.Equal(t, expectedLocationURL.Path, actualLocationURL.Path,
"paths were not equal: expected %s but got %s", expectedURL, actualURL,
)
expectedLocationQuery := expectedLocationURL.Query()
actualLocationQuery := actualLocationURL.Query()