/*
* Check that this channel passes all security checks. Returns an error code
* if this requesst should not be permitted.
*/
nsresult
nsContentSecurityManager::CheckChannel(nsIChannel* aChannel)
{
nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
MOZ_ASSERT(loadInfo);
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
// Handle cookie policies
uint32_t cookiePolicy = loadInfo->GetCookiePolicy();
if (cookiePolicy == nsILoadInfo::SEC_COOKIES_SAME_ORIGIN) {
nsIPrincipal* loadingPrincipal = loadInfo->LoadingPrincipal();
// It doesn't matter what we pass for the third, data-inherits, argument.
// Any protocol which inherits won't pay attention to cookies anyway.
rv = loadingPrincipal->CheckMayLoad(uri, false, false);
if (NS_FAILED(rv)) {
AddLoadFlags(aChannel, nsIRequest::LOAD_ANONYMOUS);
}
}
else if (cookiePolicy == nsILoadInfo::SEC_COOKIES_OMIT) {
AddLoadFlags(aChannel, nsIRequest::LOAD_ANONYMOUS);
}
nsSecurityFlags securityMode = loadInfo->GetSecurityMode();
// CORS mode is handled by nsCORSListenerProxy
if (securityMode == nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS) {
if (NS_HasBeenCrossOrigin(aChannel)) {
loadInfo->MaybeIncreaseTainting(LoadTainting::CORS);
}
return NS_OK;
}
// if none of the REQUIRE_SAME_ORIGIN flags are set, then SOP does not apply
if ((securityMode == nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_INHERITS) ||
(securityMode == nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED)) {
rv = DoSOPChecks(uri, loadInfo, aChannel);
NS_ENSURE_SUCCESS(rv, rv);
}
if ((securityMode == nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS) ||
(securityMode == nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL)) {
if (NS_HasBeenCrossOrigin(aChannel)) {
loadInfo->MaybeIncreaseTainting(LoadTainting::Opaque);
}
// Please note that DoCheckLoadURIChecks should only be enforced for
// cross origin requests. If the flag SEC_REQUIRE_CORS_DATA_INHERITS is set
// within the loadInfo, then then CheckLoadURIWithPrincipal is performed
// within nsCorsListenerProxy
rv = DoCheckLoadURIChecks(uri, loadInfo);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
static nsresult
DoSOPChecks(nsIURI* aURI, nsILoadInfo* aLoadInfo, nsIChannel* aChannel)
{
if (aLoadInfo->GetAllowChrome() &&
(URIHasFlags(aURI, nsIProtocolHandler::URI_IS_UI_RESOURCE) ||
SchemeIs(aURI, "moz-safe-about"))) {
// UI resources are allowed.
return DoCheckLoadURIChecks(aURI, aLoadInfo);
}
NS_ENSURE_FALSE(NS_HasBeenCrossOrigin(aChannel, true),
NS_ERROR_DOM_BAD_URI);
return NS_OK;
}
