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Diffstat (limited to '')
| -rw-r--r-- | caps/nsScriptSecurityManager.cpp | 1674 |
1 files changed, 1674 insertions, 0 deletions
diff --git a/caps/nsScriptSecurityManager.cpp b/caps/nsScriptSecurityManager.cpp new file mode 100644 index 0000000000..03d5844698 --- /dev/null +++ b/caps/nsScriptSecurityManager.cpp @@ -0,0 +1,1674 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "nsScriptSecurityManager.h" + +#include "mozilla/ArrayUtils.h" +#include "mozilla/StaticPrefs_extensions.h" +#include "mozilla/StaticPrefs_security.h" +#include "mozilla/StoragePrincipalHelper.h" + +#include "xpcpublic.h" +#include "XPCWrapper.h" +#include "nsILoadContext.h" +#include "nsIScriptObjectPrincipal.h" +#include "nsIScriptContext.h" +#include "nsIScriptError.h" +#include "nsINestedURI.h" +#include "nspr.h" +#include "nsJSPrincipals.h" +#include "mozilla/BasePrincipal.h" +#include "ExpandedPrincipal.h" +#include "SystemPrincipal.h" +#include "DomainPolicy.h" +#include "nsString.h" +#include "nsCRT.h" +#include "nsCRTGlue.h" +#include "nsContentSecurityUtils.h" +#include "nsDocShell.h" +#include "nsError.h" +#include "nsGlobalWindowInner.h" +#include "nsDOMCID.h" +#include "nsTextFormatter.h" +#include "nsIStringBundle.h" +#include "nsNetUtil.h" +#include "nsIEffectiveTLDService.h" +#include "nsDirectoryServiceDefs.h" +#include "nsIScriptGlobalObject.h" +#include "nsPIDOMWindow.h" +#include "nsIDocShell.h" +#include "nsIConsoleService.h" +#include "nsIOService.h" +#include "nsIContent.h" +#include "nsDOMJSUtils.h" +#include "nsAboutProtocolUtils.h" +#include "nsIClassInfo.h" +#include "nsIURIFixup.h" +#include "nsIChromeRegistry.h" +#include "nsIResProtocolHandler.h" +#include "nsIContentSecurityPolicy.h" +#include "mozilla/Components.h" +#include "mozilla/Preferences.h" +#include "mozilla/dom/BindingUtils.h" +#include "mozilla/NullPrincipal.h" +#include <stdint.h> +#include "mozilla/dom/ContentChild.h" +#include "mozilla/dom/ContentParent.h" +#include "mozilla/dom/nsCSPContext.h" +#include "mozilla/dom/ScriptSettings.h" +#include "mozilla/ClearOnShutdown.h" +#include "mozilla/StaticPtr.h" +#include "mozilla/dom/WorkerCommon.h" +#include "mozilla/dom/WorkerPrivate.h" +#include "nsContentUtils.h" +#include "nsJSUtils.h" +#include "nsILoadInfo.h" + +// This should be probably defined on some other place... but I couldn't find it +#define WEBAPPS_PERM_NAME "webapps-manage" + +using namespace mozilla; +using namespace mozilla::dom; + +nsIIOService* nsScriptSecurityManager::sIOService = nullptr; +bool nsScriptSecurityManager::sStrictFileOriginPolicy = true; + +namespace { + +class BundleHelper { + public: + NS_INLINE_DECL_REFCOUNTING(BundleHelper) + + static nsIStringBundle* GetOrCreate() { + MOZ_ASSERT(!sShutdown); + + // Already shutting down. Nothing should require the use of the string + // bundle when shutting down. + if (sShutdown) { + return nullptr; + } + + if (!sSelf) { + sSelf = new BundleHelper(); + } + + return sSelf->GetOrCreateInternal(); + } + + static void Shutdown() { + sSelf = nullptr; + sShutdown = true; + } + + private: + ~BundleHelper() = default; + + nsIStringBundle* GetOrCreateInternal() { + if (!mBundle) { + nsCOMPtr<nsIStringBundleService> bundleService = + mozilla::services::GetStringBundleService(); + if (NS_WARN_IF(!bundleService)) { + return nullptr; + } + + nsresult rv = bundleService->CreateBundle( + "chrome://global/locale/security/caps.properties", + getter_AddRefs(mBundle)); + if (NS_WARN_IF(NS_FAILED(rv))) { + return nullptr; + } + } + + return mBundle; + } + + nsCOMPtr<nsIStringBundle> mBundle; + + static StaticRefPtr<BundleHelper> sSelf; + static bool sShutdown; +}; + +StaticRefPtr<BundleHelper> BundleHelper::sSelf; +bool BundleHelper::sShutdown = false; + +} // namespace + +/////////////////////////// +// Convenience Functions // +/////////////////////////// + +class nsAutoInPrincipalDomainOriginSetter { + public: + nsAutoInPrincipalDomainOriginSetter() { ++sInPrincipalDomainOrigin; } + ~nsAutoInPrincipalDomainOriginSetter() { --sInPrincipalDomainOrigin; } + static uint32_t sInPrincipalDomainOrigin; +}; +uint32_t nsAutoInPrincipalDomainOriginSetter::sInPrincipalDomainOrigin; + +static nsresult GetOriginFromURI(nsIURI* aURI, nsACString& aOrigin) { + if (!aURI) { + return NS_ERROR_NULL_POINTER; + } + if (nsAutoInPrincipalDomainOriginSetter::sInPrincipalDomainOrigin > 1) { + // Allow a single recursive call to GetPrincipalDomainOrigin, since that + // might be happening on a different principal from the first call. But + // after that, cut off the recursion; it just indicates that something + // we're doing in this method causes us to reenter a security check here. + return NS_ERROR_NOT_AVAILABLE; + } + + nsAutoInPrincipalDomainOriginSetter autoSetter; + + nsCOMPtr<nsIURI> uri = NS_GetInnermostURI(aURI); + NS_ENSURE_TRUE(uri, NS_ERROR_UNEXPECTED); + + nsAutoCString hostPort; + + nsresult rv = uri->GetHostPort(hostPort); + if (NS_SUCCEEDED(rv)) { + nsAutoCString scheme; + rv = uri->GetScheme(scheme); + NS_ENSURE_SUCCESS(rv, rv); + aOrigin = scheme + "://"_ns + hostPort; + } else { + // Some URIs (e.g., nsSimpleURI) don't support host. Just + // get the full spec. + rv = uri->GetSpec(aOrigin); + NS_ENSURE_SUCCESS(rv, rv); + } + + return NS_OK; +} + +static nsresult GetPrincipalDomainOrigin(nsIPrincipal* aPrincipal, + nsACString& aOrigin) { + aOrigin.Truncate(); + nsCOMPtr<nsIURI> uri; + aPrincipal->GetDomain(getter_AddRefs(uri)); + nsresult rv = GetOriginFromURI(uri, aOrigin); + if (NS_SUCCEEDED(rv)) { + return rv; + } + // If there is no Domain fallback to the Principals Origin + return aPrincipal->GetOriginNoSuffix(aOrigin); +} + +inline void SetPendingExceptionASCII(JSContext* cx, const char* aMsg) { + JS_ReportErrorASCII(cx, "%s", aMsg); +} + +inline void SetPendingException(JSContext* cx, const char16_t* aMsg) { + NS_ConvertUTF16toUTF8 msg(aMsg); + JS_ReportErrorUTF8(cx, "%s", msg.get()); +} + +/* static */ +bool nsScriptSecurityManager::SecurityCompareURIs(nsIURI* aSourceURI, + nsIURI* aTargetURI) { + return NS_SecurityCompareURIs(aSourceURI, aTargetURI, + sStrictFileOriginPolicy); +} + +// SecurityHashURI is consistent with SecurityCompareURIs because +// NS_SecurityHashURI is consistent with NS_SecurityCompareURIs. See +// nsNetUtil.h. +uint32_t nsScriptSecurityManager::SecurityHashURI(nsIURI* aURI) { + return NS_SecurityHashURI(aURI); +} + +/* + * GetChannelResultPrincipal will return the principal that the resource + * returned by this channel will use. For example, if the resource is in + * a sandbox, it will return the nullprincipal. If the resource is forced + * to inherit principal, it will return the principal of its parent. If + * the load doesn't require sandboxing or inheriting, it will return the same + * principal as GetChannelURIPrincipal. Namely the principal of the URI + * that is being loaded. + */ +NS_IMETHODIMP +nsScriptSecurityManager::GetChannelResultPrincipal(nsIChannel* aChannel, + nsIPrincipal** aPrincipal) { + return GetChannelResultPrincipal(aChannel, aPrincipal, + /*aIgnoreSandboxing*/ false); +} + +nsresult nsScriptSecurityManager::GetChannelResultPrincipalIfNotSandboxed( + nsIChannel* aChannel, nsIPrincipal** aPrincipal) { + return GetChannelResultPrincipal(aChannel, aPrincipal, + /*aIgnoreSandboxing*/ true); +} + +NS_IMETHODIMP +nsScriptSecurityManager::GetChannelResultStoragePrincipal( + nsIChannel* aChannel, nsIPrincipal** aPrincipal) { + nsCOMPtr<nsIPrincipal> principal; + nsresult rv = GetChannelResultPrincipal(aChannel, getter_AddRefs(principal), + /*aIgnoreSandboxing*/ false); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + return StoragePrincipalHelper::Create( + aChannel, principal, /* aForceIsolation */ false, aPrincipal); +} + +NS_IMETHODIMP +nsScriptSecurityManager::GetChannelResultPrincipals( + nsIChannel* aChannel, nsIPrincipal** aPrincipal, + nsIPrincipal** aPartitionedPrincipal) { + nsresult rv = GetChannelResultPrincipal(aChannel, aPrincipal, + /*aIgnoreSandboxing*/ false); + if (NS_WARN_IF(NS_FAILED(rv))) { + return rv; + } + + if (!(*aPrincipal)->GetIsContentPrincipal()) { + // If for some reason we don't have a content principal here, just reuse our + // principal for the storage principal too, since attempting to create a + // storage principal would fail anyway. + nsCOMPtr<nsIPrincipal> copy = *aPrincipal; + copy.forget(aPartitionedPrincipal); + return NS_OK; + } + + return StoragePrincipalHelper::Create( + aChannel, *aPrincipal, /* aForceIsolation */ true, aPartitionedPrincipal); +} + +nsresult nsScriptSecurityManager::GetChannelResultPrincipal( + nsIChannel* aChannel, nsIPrincipal** aPrincipal, bool aIgnoreSandboxing) { + MOZ_ASSERT(aChannel, "Must have channel!"); + + // Check whether we have an nsILoadInfo that says what we should do. + nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo(); + if (loadInfo->GetForceInheritPrincipalOverruleOwner()) { + nsCOMPtr<nsIPrincipal> principalToInherit = + loadInfo->FindPrincipalToInherit(aChannel); + principalToInherit.forget(aPrincipal); + return NS_OK; + } + + nsCOMPtr<nsISupports> owner; + aChannel->GetOwner(getter_AddRefs(owner)); + if (owner) { + CallQueryInterface(owner, aPrincipal); + if (*aPrincipal) { + return NS_OK; + } + } + + if (!aIgnoreSandboxing && loadInfo->GetLoadingSandboxed()) { + nsCOMPtr<nsIPrincipal> sandboxedLoadingPrincipal = + loadInfo->GetSandboxedLoadingPrincipal(); + MOZ_ASSERT(sandboxedLoadingPrincipal); + sandboxedLoadingPrincipal.forget(aPrincipal); + return NS_OK; + } + + bool forceInherit = loadInfo->GetForceInheritPrincipal(); + if (aIgnoreSandboxing && !forceInherit) { + // Check if SEC_FORCE_INHERIT_PRINCIPAL was dropped because of + // sandboxing: + if (loadInfo->GetLoadingSandboxed() && + loadInfo->GetForceInheritPrincipalDropped()) { + forceInherit = true; + } + } + if (forceInherit) { + nsCOMPtr<nsIPrincipal> principalToInherit = + loadInfo->FindPrincipalToInherit(aChannel); + principalToInherit.forget(aPrincipal); + return NS_OK; + } + + auto securityMode = loadInfo->GetSecurityMode(); + // The data: inheritance flags should only apply to the initial load, + // not to loads that it might have redirected to. + if (loadInfo->RedirectChain().IsEmpty() && + (securityMode == + nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_INHERITS_SEC_CONTEXT || + securityMode == + nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_INHERITS_SEC_CONTEXT || + securityMode == nsILoadInfo::SEC_REQUIRE_CORS_INHERITS_SEC_CONTEXT)) { + nsCOMPtr<nsIURI> uri; + nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri)); + NS_ENSURE_SUCCESS(rv, rv); + + nsCOMPtr<nsIPrincipal> principalToInherit = + loadInfo->FindPrincipalToInherit(aChannel); + bool inheritForAboutBlank = loadInfo->GetAboutBlankInherits(); + + if (nsContentUtils::ChannelShouldInheritPrincipal( + principalToInherit, uri, inheritForAboutBlank, false)) { + principalToInherit.forget(aPrincipal); + return NS_OK; + } + } + return GetChannelURIPrincipal(aChannel, aPrincipal); +} + +/* The principal of the URI that this channel is loading. This is never + * affected by things like sandboxed loads, or loads where we forcefully + * inherit the principal. Think of this as the principal of the server + * which this channel is loading from. Most callers should use + * GetChannelResultPrincipal instead of GetChannelURIPrincipal. Only + * call GetChannelURIPrincipal if you are sure that you want the + * principal that matches the uri, even in cases when the load is + * sandboxed or when the load could be a blob or data uri (i.e even when + * you encounter loads that may or may not be sandboxed and loads + * that may or may not inherit)." + */ +NS_IMETHODIMP +nsScriptSecurityManager::GetChannelURIPrincipal(nsIChannel* aChannel, + nsIPrincipal** aPrincipal) { + MOZ_ASSERT(aChannel, "Must have channel!"); + + // Get the principal from the URI. Make sure this does the same thing + // as Document::Reset and PrototypeDocumentContentSink::Init. + nsCOMPtr<nsIURI> uri; + nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri)); + NS_ENSURE_SUCCESS(rv, rv); + + nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo(); + + // Inherit the origin attributes from loadInfo. + // If this is a top-level document load, the origin attributes of the + // loadInfo will be set from nsDocShell::DoURILoad. + // For subresource loading, the origin attributes of the loadInfo is from + // its loadingPrincipal. + OriginAttributes attrs = loadInfo->GetOriginAttributes(); + + nsCOMPtr<nsIPrincipal> prin = + BasePrincipal::CreateContentPrincipal(uri, attrs); + prin.forget(aPrincipal); + return *aPrincipal ? NS_OK : NS_ERROR_FAILURE; +} + +///////////////////////////// +// nsScriptSecurityManager // +///////////////////////////// + +//////////////////////////////////// +// Methods implementing ISupports // +//////////////////////////////////// +NS_IMPL_ISUPPORTS(nsScriptSecurityManager, nsIScriptSecurityManager) + +/////////////////////////////////////////////////// +// Methods implementing nsIScriptSecurityManager // +/////////////////////////////////////////////////// + +///////////////// Security Checks ///////////////// + +bool nsScriptSecurityManager::ContentSecurityPolicyPermitsJSAction( + JSContext* cx, JS::HandleString aCode) { + MOZ_ASSERT(cx == nsContentUtils::GetCurrentJSContext()); + + // Get the window, if any, corresponding to the current global + nsCOMPtr<nsIContentSecurityPolicy> csp; + if (nsGlobalWindowInner* win = xpc::CurrentWindowOrNull(cx)) { + csp = win->GetCsp(); + } + + nsCOMPtr<nsIPrincipal> subjectPrincipal = nsContentUtils::SubjectPrincipal(); + if (!csp) { + // Get the CSP for addon sandboxes. If the principal is expanded and has a + // csp, we're probably in luck. + auto* basePrin = BasePrincipal::Cast(subjectPrincipal); + // ContentScriptAddonPolicy means it is also an expanded principal, thus + // this is in a sandbox used as a content script. + if (basePrin->ContentScriptAddonPolicy()) { + basePrin->As<ExpandedPrincipal>()->GetCsp(getter_AddRefs(csp)); + } + // don't do anything unless there's a CSP + if (!csp) { + return true; + } + } + + nsCOMPtr<nsICSPEventListener> cspEventListener; + if (!NS_IsMainThread()) { + WorkerPrivate* workerPrivate = + mozilla::dom::GetWorkerPrivateFromContext(cx); + if (workerPrivate) { + cspEventListener = workerPrivate->CSPEventListener(); + } + } + + bool evalOK = true; + bool reportViolation = false; + nsresult rv = csp->GetAllowsEval(&reportViolation, &evalOK); + + // A little convoluted. We want the scriptSample for a) reporting a violation + // or b) passing it to AssertEvalNotUsingSystemPrincipal or c) we're in the + // parent process. So do the work to get it if either of those cases is true. + nsAutoJSString scriptSample; + if (reportViolation || subjectPrincipal->IsSystemPrincipal() || + XRE_IsE10sParentProcess()) { + if (NS_WARN_IF(!scriptSample.init(cx, aCode))) { + JS_ClearPendingException(cx); + return false; + } + } + +#if !defined(ANDROID) + if (!nsContentSecurityUtils::IsEvalAllowed( + cx, subjectPrincipal->IsSystemPrincipal(), scriptSample)) { + return false; + } +#endif + + if (NS_FAILED(rv)) { + NS_WARNING("CSP: failed to get allowsEval"); + return true; // fail open to not break sites. + } + + if (reportViolation) { + JS::AutoFilename scriptFilename; + nsAutoString fileName; + unsigned lineNum = 0; + unsigned columnNum = 0; + if (JS::DescribeScriptedCaller(cx, &scriptFilename, &lineNum, &columnNum)) { + if (const char* file = scriptFilename.get()) { + CopyUTF8toUTF16(nsDependentCString(file), fileName); + } + } else { + MOZ_ASSERT(!JS_IsExceptionPending(cx)); + } + csp->LogViolationDetails(nsIContentSecurityPolicy::VIOLATION_TYPE_EVAL, + nullptr, // triggering element + cspEventListener, fileName, scriptSample, lineNum, + columnNum, u""_ns, u""_ns); + } + + return evalOK; +} + +// static +bool nsScriptSecurityManager::JSPrincipalsSubsume(JSPrincipals* first, + JSPrincipals* second) { + return nsJSPrincipals::get(first)->Subsumes(nsJSPrincipals::get(second)); +} + +NS_IMETHODIMP +nsScriptSecurityManager::CheckSameOriginURI(nsIURI* aSourceURI, + nsIURI* aTargetURI, + bool reportError, + bool aFromPrivateWindow) { + // Please note that aFromPrivateWindow is only 100% accurate if + // reportError is true. + if (!SecurityCompareURIs(aSourceURI, aTargetURI)) { + if (reportError) { + ReportError("CheckSameOriginError", aSourceURI, aTargetURI, + aFromPrivateWindow); + } + return NS_ERROR_DOM_BAD_URI; + } + return NS_OK; +} + +NS_IMETHODIMP +nsScriptSecurityManager::CheckLoadURIFromScript(JSContext* cx, nsIURI* aURI) { + // Get principal of currently executing script. + MOZ_ASSERT(cx == nsContentUtils::GetCurrentJSContext()); + nsIPrincipal* principal = nsContentUtils::SubjectPrincipal(); + nsresult rv = CheckLoadURIWithPrincipal( + // Passing 0 for the window ID here is OK, because we will report a + // script-visible exception anyway. + principal, aURI, nsIScriptSecurityManager::STANDARD, 0); + if (NS_SUCCEEDED(rv)) { + // OK to load + return NS_OK; + } + + // Report error. + nsAutoCString spec; + if (NS_FAILED(aURI->GetAsciiSpec(spec))) return NS_ERROR_FAILURE; + nsAutoCString msg("Access to '"); + msg.Append(spec); + msg.AppendLiteral("' from script denied"); + SetPendingExceptionASCII(cx, msg.get()); + return NS_ERROR_DOM_BAD_URI; +} + +/** + * Helper method to handle cases where a flag passed to + * CheckLoadURIWithPrincipal means denying loading if the given URI has certain + * nsIProtocolHandler flags set. + * @return if success, access is allowed. Otherwise, deny access + */ +static nsresult DenyAccessIfURIHasFlags(nsIURI* aURI, uint32_t aURIFlags) { + MOZ_ASSERT(aURI, "Must have URI!"); + + bool uriHasFlags; + nsresult rv = NS_URIChainHasFlags(aURI, aURIFlags, &uriHasFlags); + NS_ENSURE_SUCCESS(rv, rv); + + if (uriHasFlags) { + return NS_ERROR_DOM_BAD_URI; + } + + return NS_OK; +} + +static bool EqualOrSubdomain(nsIURI* aProbeArg, nsIURI* aBase) { + nsresult rv; + nsCOMPtr<nsIURI> probe = aProbeArg; + + nsCOMPtr<nsIEffectiveTLDService> tldService = + do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID); + NS_ENSURE_TRUE(tldService, false); + while (true) { + if (nsScriptSecurityManager::SecurityCompareURIs(probe, aBase)) { + return true; + } + + nsAutoCString host, newHost; + rv = probe->GetHost(host); + NS_ENSURE_SUCCESS(rv, false); + + rv = tldService->GetNextSubDomain(host, newHost); + if (rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) { + return false; + } + NS_ENSURE_SUCCESS(rv, false); + rv = NS_MutateURI(probe).SetHost(newHost).Finalize(probe); + NS_ENSURE_SUCCESS(rv, false); + } +} + +NS_IMETHODIMP +nsScriptSecurityManager::CheckLoadURIWithPrincipal(nsIPrincipal* aPrincipal, + nsIURI* aTargetURI, + uint32_t aFlags, + uint64_t aInnerWindowID) { + MOZ_ASSERT(aPrincipal, "CheckLoadURIWithPrincipal must have a principal"); + + // If someone passes a flag that we don't understand, we should + // fail, because they may need a security check that we don't + // provide. + NS_ENSURE_FALSE( + aFlags & + ~(nsIScriptSecurityManager::LOAD_IS_AUTOMATIC_DOCUMENT_REPLACEMENT | + nsIScriptSecurityManager::ALLOW_CHROME | + nsIScriptSecurityManager::DISALLOW_SCRIPT | + nsIScriptSecurityManager::DISALLOW_INHERIT_PRINCIPAL | + nsIScriptSecurityManager::DONT_REPORT_ERRORS), + NS_ERROR_UNEXPECTED); + NS_ENSURE_ARG_POINTER(aPrincipal); + NS_ENSURE_ARG_POINTER(aTargetURI); + + // If DISALLOW_INHERIT_PRINCIPAL is set, we prevent loading of URIs which + // would do such inheriting. That would be URIs that do not have their own + // security context. We do this even for the system principal. + if (aFlags & nsIScriptSecurityManager::DISALLOW_INHERIT_PRINCIPAL) { + nsresult rv = DenyAccessIfURIHasFlags( + aTargetURI, nsIProtocolHandler::URI_INHERITS_SECURITY_CONTEXT); + NS_ENSURE_SUCCESS(rv, rv); + } + + if (aPrincipal == mSystemPrincipal) { + // Allow access + return NS_OK; + } + + nsCOMPtr<nsIURI> sourceURI; + auto* basePrin = BasePrincipal::Cast(aPrincipal); + basePrin->GetURI(getter_AddRefs(sourceURI)); + if (!sourceURI) { + if (basePrin->Is<ExpandedPrincipal>()) { + auto expanded = basePrin->As<ExpandedPrincipal>(); + for (auto& prin : expanded->AllowList()) { + nsresult rv = + CheckLoadURIWithPrincipal(prin, aTargetURI, aFlags, aInnerWindowID); + if (NS_SUCCEEDED(rv)) { + // Allow access if it succeeded with one of the allowlisted principals + return NS_OK; + } + } + // None of our allowlisted principals worked. + return NS_ERROR_DOM_BAD_URI; + } + NS_ERROR( + "Non-system principals or expanded principal passed to " + "CheckLoadURIWithPrincipal " + "must have a URI!"); + return NS_ERROR_UNEXPECTED; + } + + // Automatic loads are not allowed from certain protocols. + if (aFlags & + nsIScriptSecurityManager::LOAD_IS_AUTOMATIC_DOCUMENT_REPLACEMENT) { + nsresult rv = DenyAccessIfURIHasFlags( + sourceURI, + nsIProtocolHandler::URI_FORBIDS_AUTOMATIC_DOCUMENT_REPLACEMENT); + NS_ENSURE_SUCCESS(rv, rv); + } + + // If either URI is a nested URI, get the base URI + nsCOMPtr<nsIURI> sourceBaseURI = NS_GetInnermostURI(sourceURI); + nsCOMPtr<nsIURI> targetBaseURI = NS_GetInnermostURI(aTargetURI); + + //-- get the target scheme + nsAutoCString targetScheme; + nsresult rv = targetBaseURI->GetScheme(targetScheme); + if (NS_FAILED(rv)) return rv; + + //-- Some callers do not allow loading javascript: + if ((aFlags & nsIScriptSecurityManager::DISALLOW_SCRIPT) && + targetScheme.EqualsLiteral("javascript")) { + return NS_ERROR_DOM_BAD_URI; + } + + // Check for uris that are only loadable by principals that subsume them + bool targetURIIsLoadableBySubsumers = false; + rv = NS_URIChainHasFlags(targetBaseURI, + nsIProtocolHandler::URI_LOADABLE_BY_SUBSUMERS, + &targetURIIsLoadableBySubsumers); + NS_ENSURE_SUCCESS(rv, rv); + + if (targetURIIsLoadableBySubsumers) { + // check nothing else in the URI chain has flags that prevent + // access: + rv = CheckLoadURIFlags( + sourceURI, aTargetURI, sourceBaseURI, targetBaseURI, aFlags, + aPrincipal->OriginAttributesRef().mPrivateBrowsingId > 0, + aInnerWindowID); + NS_ENSURE_SUCCESS(rv, rv); + // Check the principal is allowed to load the target. + if (aFlags & nsIScriptSecurityManager::DONT_REPORT_ERRORS) { + return aPrincipal->CheckMayLoad(targetBaseURI, false); + } + return aPrincipal->CheckMayLoadWithReporting(targetBaseURI, false, + aInnerWindowID); + } + + //-- get the source scheme + nsAutoCString sourceScheme; + rv = sourceBaseURI->GetScheme(sourceScheme); + if (NS_FAILED(rv)) return rv; + + if (sourceScheme.LowerCaseEqualsLiteral(NS_NULLPRINCIPAL_SCHEME)) { + // A null principal can target its own URI. + if (sourceURI == aTargetURI) { + return NS_OK; + } + } else if (sourceScheme.EqualsIgnoreCase("file") && + targetScheme.EqualsIgnoreCase("moz-icon")) { + // exception for file: linking to moz-icon://.ext?size=... + // Note that because targetScheme is the base (innermost) URI scheme, + // this does NOT allow file -> moz-icon:file:///... links. + // This is intentional. + return NS_OK; + } + + // Check for webextension + bool targetURIIsLoadableByExtensions = false; + rv = NS_URIChainHasFlags(aTargetURI, + nsIProtocolHandler::URI_LOADABLE_BY_EXTENSIONS, + &targetURIIsLoadableByExtensions); + NS_ENSURE_SUCCESS(rv, rv); + + if (targetURIIsLoadableByExtensions && + BasePrincipal::Cast(aPrincipal)->AddonPolicy()) { + return NS_OK; + } + + // If we get here, check all the schemes can link to each other, from the top + // down: + nsCOMPtr<nsIURI> currentURI = sourceURI; + nsCOMPtr<nsIURI> currentOtherURI = aTargetURI; + + bool denySameSchemeLinks = false; + rv = NS_URIChainHasFlags(aTargetURI, + nsIProtocolHandler::URI_SCHEME_NOT_SELF_LINKABLE, + &denySameSchemeLinks); + if (NS_FAILED(rv)) return rv; + + while (currentURI && currentOtherURI) { + nsAutoCString scheme, otherScheme; + currentURI->GetScheme(scheme); + currentOtherURI->GetScheme(otherScheme); + + bool schemesMatch = + scheme.Equals(otherScheme, nsCaseInsensitiveCStringComparator); + bool isSamePage = false; + // about: URIs are special snowflakes. + if (scheme.EqualsLiteral("about") && schemesMatch) { + nsAutoCString moduleName, otherModuleName; + // about: pages can always link to themselves: + isSamePage = + NS_SUCCEEDED(NS_GetAboutModuleName(currentURI, moduleName)) && + NS_SUCCEEDED( + NS_GetAboutModuleName(currentOtherURI, otherModuleName)) && + moduleName.Equals(otherModuleName); + if (!isSamePage) { + // We will have allowed the load earlier if the source page has + // system principal. So we know the source has a content + // principal, and it's trying to link to something else. + // Linkable about: pages are always reachable, even if we hit + // the CheckLoadURIFlags call below. + // We punch only 1 other hole: iff the source is unlinkable, + // we let them link to other pages explicitly marked SAFE + // for content. This avoids world-linkable about: pages linking + // to non-world-linkable about: pages. + nsCOMPtr<nsIAboutModule> module, otherModule; + bool knowBothModules = + NS_SUCCEEDED( + NS_GetAboutModule(currentURI, getter_AddRefs(module))) && + NS_SUCCEEDED(NS_GetAboutModule(currentOtherURI, + getter_AddRefs(otherModule))); + uint32_t aboutModuleFlags = 0; + uint32_t otherAboutModuleFlags = 0; + knowBothModules = + knowBothModules && + NS_SUCCEEDED(module->GetURIFlags(currentURI, &aboutModuleFlags)) && + NS_SUCCEEDED(otherModule->GetURIFlags(currentOtherURI, + &otherAboutModuleFlags)); + if (knowBothModules) { + isSamePage = !(aboutModuleFlags & nsIAboutModule::MAKE_LINKABLE) && + (otherAboutModuleFlags & + nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT); + if (isSamePage && + otherAboutModuleFlags & nsIAboutModule::MAKE_LINKABLE) { + // XXXgijs: this is a hack. The target will be nested + // (with innerURI of moz-safe-about:whatever), and + // the source isn't, so we won't pass if we finish + // the loop. We *should* pass, though, so return here. + // This hack can go away when bug 1228118 is fixed. + return NS_OK; + } + } + } + } else { + bool equalExceptRef = false; + rv = currentURI->EqualsExceptRef(currentOtherURI, &equalExceptRef); + isSamePage = NS_SUCCEEDED(rv) && equalExceptRef; + } + + // If schemes are not equal, or they're equal but the target URI + // is different from the source URI and doesn't always allow linking + // from the same scheme, check if the URI flags of the current target + // URI allow the current source URI to link to it. + // The policy is specified by the protocol flags on both URIs. + if (!schemesMatch || (denySameSchemeLinks && !isSamePage)) { + return CheckLoadURIFlags( + currentURI, currentOtherURI, sourceBaseURI, targetBaseURI, aFlags, + aPrincipal->OriginAttributesRef().mPrivateBrowsingId > 0, + aInnerWindowID); + } + // Otherwise... check if we can nest another level: + nsCOMPtr<nsINestedURI> nestedURI = do_QueryInterface(currentURI); + nsCOMPtr<nsINestedURI> nestedOtherURI = do_QueryInterface(currentOtherURI); + + // If schemes match and neither URI is nested further, we're OK. + if (!nestedURI && !nestedOtherURI) { + return NS_OK; + } + // If one is nested and the other isn't, something is wrong. + if (!nestedURI != !nestedOtherURI) { + return NS_ERROR_DOM_BAD_URI; + } + // Otherwise, both should be nested and we'll go through the loop again. + nestedURI->GetInnerURI(getter_AddRefs(currentURI)); + nestedOtherURI->GetInnerURI(getter_AddRefs(currentOtherURI)); + } + + // We should never get here. We should always return from inside the loop. + return NS_ERROR_DOM_BAD_URI; +} + +/** + * Helper method to check whether the target URI and its innermost ("base") URI + * has protocol flags that should stop it from being loaded by the source URI + * (and/or the source URI's innermost ("base") URI), taking into account any + * nsIScriptSecurityManager flags originally passed to + * CheckLoadURIWithPrincipal and friends. + * + * @return if success, access is allowed. Otherwise, deny access + */ +nsresult nsScriptSecurityManager::CheckLoadURIFlags( + nsIURI* aSourceURI, nsIURI* aTargetURI, nsIURI* aSourceBaseURI, + nsIURI* aTargetBaseURI, uint32_t aFlags, bool aFromPrivateWindow, + uint64_t aInnerWindowID) { + // Note that the order of policy checks here is very important! + // We start from most restrictive and work our way down. + bool reportErrors = !(aFlags & nsIScriptSecurityManager::DONT_REPORT_ERRORS); + const char* errorTag = "CheckLoadURIError"; + + nsAutoCString targetScheme; + nsresult rv = aTargetBaseURI->GetScheme(targetScheme); + if (NS_FAILED(rv)) return rv; + + // Check for system target URI + rv = DenyAccessIfURIHasFlags(aTargetURI, + nsIProtocolHandler::URI_DANGEROUS_TO_LOAD); + if (NS_FAILED(rv)) { + // Deny access, since the origin principal is not system + if (reportErrors) { + ReportError(errorTag, aSourceURI, aTargetURI, aFromPrivateWindow, + aInnerWindowID); + } + return rv; + } + + // Used by ExtensionProtocolHandler to prevent loading extension resources + // in private contexts if the extension does not have permission. + if (aFromPrivateWindow) { + rv = DenyAccessIfURIHasFlags( + aTargetURI, nsIProtocolHandler::URI_DISALLOW_IN_PRIVATE_CONTEXT); + if (NS_FAILED(rv)) { + if (reportErrors) { + ReportError(errorTag, aSourceURI, aTargetURI, aFromPrivateWindow, + aInnerWindowID); + } + return rv; + } + } + + // Check for chrome target URI + bool targetURIIsUIResource = false; + rv = NS_URIChainHasFlags(aTargetURI, nsIProtocolHandler::URI_IS_UI_RESOURCE, + &targetURIIsUIResource); + NS_ENSURE_SUCCESS(rv, rv); + if (targetURIIsUIResource) { + // ALLOW_CHROME is a flag that we pass on all loads _except_ docshell + // loads (since docshell loads run the loaded content with its origin + // principal). We are effectively allowing resource:// and chrome:// + // URIs to load as long as they are content accessible and as long + // they're not loading it as a document. + if (aFlags & nsIScriptSecurityManager::ALLOW_CHROME) { + bool sourceIsUIResource = false; + rv = NS_URIChainHasFlags(aSourceBaseURI, + nsIProtocolHandler::URI_IS_UI_RESOURCE, + &sourceIsUIResource); + NS_ENSURE_SUCCESS(rv, rv); + if (sourceIsUIResource) { + // TODO Bug 1654488: Remove pref in CheckLoadURIFlags which + // allows all UI resources to load + if (StaticPrefs:: + security_caps_allow_uri_is_ui_resource_in_checkloaduriflags()) { + return NS_OK; + } + // Special case for moz-icon URIs loaded by a local resources like + // e.g. chrome: or resource: + if (targetScheme.EqualsLiteral("moz-icon")) { + return NS_OK; + } + } + + if (targetScheme.EqualsLiteral("resource")) { + if (StaticPrefs::security_all_resource_uri_content_accessible()) { + return NS_OK; + } + + nsCOMPtr<nsIProtocolHandler> ph; + rv = sIOService->GetProtocolHandler("resource", getter_AddRefs(ph)); + NS_ENSURE_SUCCESS(rv, rv); + if (!ph) { + return NS_ERROR_DOM_BAD_URI; + } + + nsCOMPtr<nsIResProtocolHandler> rph = do_QueryInterface(ph); + if (!rph) { + return NS_ERROR_DOM_BAD_URI; + } + + bool accessAllowed = false; + rph->AllowContentToAccess(aTargetBaseURI, &accessAllowed); + if (accessAllowed) { + return NS_OK; + } + } else if (targetScheme.EqualsLiteral("chrome")) { + // Allow the load only if the chrome package is allowlisted. + nsCOMPtr<nsIXULChromeRegistry> reg( + do_GetService(NS_CHROMEREGISTRY_CONTRACTID)); + if (reg) { + bool accessAllowed = false; + reg->AllowContentToAccess(aTargetBaseURI, &accessAllowed); + if (accessAllowed) { + return NS_OK; + } + } + } else if (targetScheme.EqualsLiteral("moz-page-thumb")) { + if (XRE_IsParentProcess()) { + return NS_OK; + } + + auto& remoteType = dom::ContentChild::GetSingleton()->GetRemoteType(); + if (remoteType == PRIVILEGEDABOUT_REMOTE_TYPE) { + return NS_OK; + } + } + } + + if (reportErrors) { + ReportError(errorTag, aSourceURI, aTargetURI, aFromPrivateWindow, + aInnerWindowID); + } + return NS_ERROR_DOM_BAD_URI; + } + + // Check for target URI pointing to a file + bool targetURIIsLocalFile = false; + rv = NS_URIChainHasFlags(aTargetURI, nsIProtocolHandler::URI_IS_LOCAL_FILE, + &targetURIIsLocalFile); + NS_ENSURE_SUCCESS(rv, rv); + if (targetURIIsLocalFile) { + // Allow domains that were allowlisted in the prefs. In 99.9% of cases, + // this array is empty. + bool isAllowlisted; + MOZ_ALWAYS_SUCCEEDS(InFileURIAllowlist(aSourceURI, &isAllowlisted)); + if (isAllowlisted) { + return NS_OK; + } + + // Allow chrome:// + if (aSourceBaseURI->SchemeIs("chrome")) { + return NS_OK; + } + + // Nothing else. + if (reportErrors) { + ReportError(errorTag, aSourceURI, aTargetURI, aFromPrivateWindow, + aInnerWindowID); + } + return NS_ERROR_DOM_BAD_URI; + } + +#ifdef DEBUG + { + // Everyone is allowed to load this. The case URI_LOADABLE_BY_SUBSUMERS + // is handled by the caller which is just delegating to us as a helper. + bool hasSubsumersFlag = false; + NS_URIChainHasFlags(aTargetBaseURI, + nsIProtocolHandler::URI_LOADABLE_BY_SUBSUMERS, + &hasSubsumersFlag); + bool hasLoadableByAnyone = false; + NS_URIChainHasFlags(aTargetBaseURI, + nsIProtocolHandler::URI_LOADABLE_BY_ANYONE, + &hasLoadableByAnyone); + MOZ_ASSERT(hasLoadableByAnyone || hasSubsumersFlag, + "why do we get here and do not have any of the two flags set?"); + } +#endif + + return NS_OK; +} + +nsresult nsScriptSecurityManager::ReportError(const char* aMessageTag, + const nsACString& aSourceSpec, + const nsACString& aTargetSpec, + bool aFromPrivateWindow, + uint64_t aInnerWindowID) { + if (aSourceSpec.IsEmpty() || aTargetSpec.IsEmpty()) { + return NS_OK; + } + + nsCOMPtr<nsIStringBundle> bundle = BundleHelper::GetOrCreate(); + if (NS_WARN_IF(!bundle)) { + return NS_OK; + } + + // Localize the error message + nsAutoString message; + AutoTArray<nsString, 2> formatStrings; + CopyASCIItoUTF16(aSourceSpec, *formatStrings.AppendElement()); + CopyASCIItoUTF16(aTargetSpec, *formatStrings.AppendElement()); + nsresult rv = + bundle->FormatStringFromName(aMessageTag, formatStrings, message); + NS_ENSURE_SUCCESS(rv, rv); + + nsCOMPtr<nsIConsoleService> console( + do_GetService(NS_CONSOLESERVICE_CONTRACTID)); + NS_ENSURE_TRUE(console, NS_ERROR_FAILURE); + nsCOMPtr<nsIScriptError> error(do_CreateInstance(NS_SCRIPTERROR_CONTRACTID)); + NS_ENSURE_TRUE(error, NS_ERROR_FAILURE); + + // using category of "SOP" so we can link to MDN + if (aInnerWindowID != 0) { + rv = error->InitWithWindowID( + message, u""_ns, u""_ns, 0, 0, nsIScriptError::errorFlag, "SOP"_ns, + aInnerWindowID, true /* From chrome context */); + } else { + rv = error->Init(message, u""_ns, u""_ns, 0, 0, nsIScriptError::errorFlag, + "SOP", aFromPrivateWindow, true /* From chrome context */); + } + NS_ENSURE_SUCCESS(rv, rv); + console->LogMessage(error); + return NS_OK; +} + +nsresult nsScriptSecurityManager::ReportError(const char* aMessageTag, + nsIURI* aSource, nsIURI* aTarget, + bool aFromPrivateWindow, + uint64_t aInnerWindowID) { + NS_ENSURE_TRUE(aSource && aTarget, NS_ERROR_NULL_POINTER); + + // Get the source URL spec + nsAutoCString sourceSpec; + nsresult rv = aSource->GetAsciiSpec(sourceSpec); + NS_ENSURE_SUCCESS(rv, rv); + + // Get the target URL spec + nsAutoCString targetSpec; + rv = aTarget->GetAsciiSpec(targetSpec); + NS_ENSURE_SUCCESS(rv, rv); + + return ReportError(aMessageTag, sourceSpec, targetSpec, aFromPrivateWindow, + aInnerWindowID); +} + +NS_IMETHODIMP +nsScriptSecurityManager::CheckLoadURIStrWithPrincipal( + nsIPrincipal* aPrincipal, const nsACString& aTargetURIStr, + uint32_t aFlags) { + nsresult rv; + nsCOMPtr<nsIURI> target; + rv = NS_NewURI(getter_AddRefs(target), aTargetURIStr); + NS_ENSURE_SUCCESS(rv, rv); + + rv = CheckLoadURIWithPrincipal(aPrincipal, target, aFlags, 0); + if (rv == NS_ERROR_DOM_BAD_URI) { + // Don't warn because NS_ERROR_DOM_BAD_URI is one of the expected + // return values. + return rv; + } + NS_ENSURE_SUCCESS(rv, rv); + + // Now start testing fixup -- since aTargetURIStr is a string, not + // an nsIURI, we may well end up fixing it up before loading. + // Note: This needs to stay in sync with the nsIURIFixup api. + nsCOMPtr<nsIURIFixup> fixup = components::URIFixup::Service(); + if (!fixup) { + return rv; + } + + // URIFixup's keyword and alternate flags can only fixup to http/https, so we + // can skip testing them. This simplifies our life because this code can be + // invoked from the content process where the search service would not be + // available. + uint32_t flags[] = {nsIURIFixup::FIXUP_FLAG_NONE, + nsIURIFixup::FIXUP_FLAG_FIX_SCHEME_TYPOS}; + for (uint32_t i = 0; i < ArrayLength(flags); ++i) { + uint32_t fixupFlags = flags[i]; + if (aPrincipal->OriginAttributesRef().mPrivateBrowsingId > 0) { + fixupFlags |= nsIURIFixup::FIXUP_FLAG_PRIVATE_CONTEXT; + } + nsCOMPtr<nsIURIFixupInfo> fixupInfo; + rv = fixup->GetFixupURIInfo(aTargetURIStr, fixupFlags, + getter_AddRefs(fixupInfo)); + NS_ENSURE_SUCCESS(rv, rv); + rv = fixupInfo->GetPreferredURI(getter_AddRefs(target)); + NS_ENSURE_SUCCESS(rv, rv); + + rv = CheckLoadURIWithPrincipal(aPrincipal, target, aFlags, 0); + if (rv == NS_ERROR_DOM_BAD_URI) { + // Don't warn because NS_ERROR_DOM_BAD_URI is one of the expected + // return values. + return rv; + } + NS_ENSURE_SUCCESS(rv, rv); + } + + return rv; +} + +NS_IMETHODIMP +nsScriptSecurityManager::InFileURIAllowlist(nsIURI* aUri, bool* aResult) { + MOZ_ASSERT(aUri); + MOZ_ASSERT(aResult); + + *aResult = false; + for (nsIURI* uri : EnsureFileURIAllowlist()) { + if (EqualOrSubdomain(aUri, uri)) { + *aResult = true; + return NS_OK; + } + } + + return NS_OK; +} + +///////////////// Principals /////////////////////// + +NS_IMETHODIMP +nsScriptSecurityManager::GetSystemPrincipal(nsIPrincipal** result) { + NS_ADDREF(*result = mSystemPrincipal); + + return NS_OK; +} + +NS_IMETHODIMP +nsScriptSecurityManager::CreateContentPrincipal( + nsIURI* aURI, JS::Handle<JS::Value> aOriginAttributes, JSContext* aCx, + nsIPrincipal** aPrincipal) { + OriginAttributes attrs; + if (!aOriginAttributes.isObject() || !attrs.Init(aCx, aOriginAttributes)) { + return NS_ERROR_INVALID_ARG; + } + nsCOMPtr<nsIPrincipal> prin = + BasePrincipal::CreateContentPrincipal(aURI, attrs); + prin.forget(aPrincipal); + return *aPrincipal ? NS_OK : NS_ERROR_FAILURE; +} + +NS_IMETHODIMP +nsScriptSecurityManager::CreateContentPrincipalFromOrigin( + const nsACString& aOrigin, nsIPrincipal** aPrincipal) { + if (StringBeginsWith(aOrigin, "["_ns)) { + return NS_ERROR_INVALID_ARG; + } + + if (StringBeginsWith(aOrigin, + nsLiteralCString(NS_NULLPRINCIPAL_SCHEME ":"))) { + return NS_ERROR_INVALID_ARG; + } + + nsCOMPtr<nsIPrincipal> prin = BasePrincipal::CreateContentPrincipal(aOrigin); + prin.forget(aPrincipal); + return *aPrincipal ? NS_OK : NS_ERROR_FAILURE; +} + +NS_IMETHODIMP +nsScriptSecurityManager::PrincipalToJSON(nsIPrincipal* aPrincipal, + nsACString& aJSON) { + aJSON.Truncate(); + if (!aPrincipal) { + return NS_ERROR_FAILURE; + } + + BasePrincipal::Cast(aPrincipal)->ToJSON(aJSON); + + if (aJSON.IsEmpty()) { + return NS_ERROR_FAILURE; + } + + return NS_OK; +} + +NS_IMETHODIMP +nsScriptSecurityManager::JSONToPrincipal(const nsACString& aJSON, + nsIPrincipal** aPrincipal) { + if (aJSON.IsEmpty()) { + return NS_ERROR_FAILURE; + } + + nsCOMPtr<nsIPrincipal> principal = BasePrincipal::FromJSON(aJSON); + + if (!principal) { + return NS_ERROR_FAILURE; + } + + principal.forget(aPrincipal); + return NS_OK; +} + +NS_IMETHODIMP +nsScriptSecurityManager::CreateNullPrincipal( + JS::Handle<JS::Value> aOriginAttributes, JSContext* aCx, + nsIPrincipal** aPrincipal) { + OriginAttributes attrs; + if (!aOriginAttributes.isObject() || !attrs.Init(aCx, aOriginAttributes)) { + return NS_ERROR_INVALID_ARG; + } + nsCOMPtr<nsIPrincipal> prin = NullPrincipal::Create(attrs); + prin.forget(aPrincipal); + return NS_OK; +} + +NS_IMETHODIMP +nsScriptSecurityManager::GetLoadContextContentPrincipal( + nsIURI* aURI, nsILoadContext* aLoadContext, nsIPrincipal** aPrincipal) { + NS_ENSURE_STATE(aLoadContext); + OriginAttributes docShellAttrs; + aLoadContext->GetOriginAttributes(docShellAttrs); + + nsCOMPtr<nsIPrincipal> prin = + BasePrincipal::CreateContentPrincipal(aURI, docShellAttrs); + prin.forget(aPrincipal); + return *aPrincipal ? NS_OK : NS_ERROR_FAILURE; +} + +NS_IMETHODIMP +nsScriptSecurityManager::GetDocShellContentPrincipal( + nsIURI* aURI, nsIDocShell* aDocShell, nsIPrincipal** aPrincipal) { + nsCOMPtr<nsIPrincipal> prin = BasePrincipal::CreateContentPrincipal( + aURI, nsDocShell::Cast(aDocShell)->GetOriginAttributes()); + prin.forget(aPrincipal); + return *aPrincipal ? NS_OK : NS_ERROR_FAILURE; +} + +NS_IMETHODIMP +nsScriptSecurityManager::PrincipalWithOA( + nsIPrincipal* aPrincipal, JS::Handle<JS::Value> aOriginAttributes, + JSContext* aCx, nsIPrincipal** aReturnPrincipal) { + if (!aPrincipal) { + return NS_OK; + } + if (aPrincipal->GetIsContentPrincipal()) { + OriginAttributes attrs; + if (!aOriginAttributes.isObject() || !attrs.Init(aCx, aOriginAttributes)) { + return NS_ERROR_INVALID_ARG; + } + RefPtr<ContentPrincipal> copy = new ContentPrincipal(); + auto* contentPrincipal = static_cast<ContentPrincipal*>(aPrincipal); + nsresult rv = copy->Init(contentPrincipal, attrs); + NS_ENSURE_SUCCESS(rv, rv); + copy.forget(aReturnPrincipal); + } else { + // We do this for null principals, system principals (both fine) + // ... and expanded principals, where we should probably do something + // cleverer, but I also don't think we care too much. + nsCOMPtr<nsIPrincipal> prin = aPrincipal; + prin.forget(aReturnPrincipal); + } + + return *aReturnPrincipal ? NS_OK : NS_ERROR_FAILURE; +} + +NS_IMETHODIMP +nsScriptSecurityManager::CanCreateWrapper(JSContext* cx, const nsIID& aIID, + nsISupports* aObj, + nsIClassInfo* aClassInfo) { + // XXX Special case for Exception ? + + // We give remote-XUL allowlisted domains a free pass here. See bug 932906. + JS::Rooted<JS::Realm*> contextRealm(cx, JS::GetCurrentRealmOrNull(cx)); + MOZ_RELEASE_ASSERT(contextRealm); + if (!xpc::AllowContentXBLScope(contextRealm)) { + return NS_OK; + } + + if (nsContentUtils::IsCallerChrome()) { + return NS_OK; + } + + //-- Access denied, report an error + nsAutoCString originUTF8; + nsIPrincipal* subjectPrincipal = nsContentUtils::SubjectPrincipal(); + GetPrincipalDomainOrigin(subjectPrincipal, originUTF8); + NS_ConvertUTF8toUTF16 originUTF16(originUTF8); + nsAutoCString classInfoNameUTF8; + if (aClassInfo) { + aClassInfo->GetClassDescription(classInfoNameUTF8); + } + if (classInfoNameUTF8.IsEmpty()) { + classInfoNameUTF8.AssignLiteral("UnnamedClass"); + } + + nsCOMPtr<nsIStringBundle> bundle = BundleHelper::GetOrCreate(); + if (NS_WARN_IF(!bundle)) { + return NS_OK; + } + + NS_ConvertUTF8toUTF16 classInfoUTF16(classInfoNameUTF8); + nsresult rv; + nsAutoString errorMsg; + if (originUTF16.IsEmpty()) { + AutoTArray<nsString, 1> formatStrings = {classInfoUTF16}; + rv = bundle->FormatStringFromName("CreateWrapperDenied", formatStrings, + errorMsg); + } else { + AutoTArray<nsString, 2> formatStrings = {classInfoUTF16, originUTF16}; + rv = bundle->FormatStringFromName("CreateWrapperDeniedForOrigin", + formatStrings, errorMsg); + } + NS_ENSURE_SUCCESS(rv, rv); + + SetPendingException(cx, errorMsg.get()); + return NS_ERROR_DOM_XPCONNECT_ACCESS_DENIED; +} + +NS_IMETHODIMP +nsScriptSecurityManager::CanCreateInstance(JSContext* cx, const nsCID& aCID) { + if (nsContentUtils::IsCallerChrome()) { + return NS_OK; + } + + //-- Access denied, report an error + nsAutoCString errorMsg("Permission denied to create instance of class. CID="); + char cidStr[NSID_LENGTH]; + aCID.ToProvidedString(cidStr); + errorMsg.Append(cidStr); + SetPendingExceptionASCII(cx, errorMsg.get()); + return NS_ERROR_DOM_XPCONNECT_ACCESS_DENIED; +} + +NS_IMETHODIMP +nsScriptSecurityManager::CanGetService(JSContext* cx, const nsCID& aCID) { + if (nsContentUtils::IsCallerChrome()) { + return NS_OK; + } + + //-- Access denied, report an error + nsAutoCString errorMsg("Permission denied to get service. CID="); + char cidStr[NSID_LENGTH]; + aCID.ToProvidedString(cidStr); + errorMsg.Append(cidStr); + SetPendingExceptionASCII(cx, errorMsg.get()); + return NS_ERROR_DOM_XPCONNECT_ACCESS_DENIED; +} + +const char sJSEnabledPrefName[] = "javascript.enabled"; +const char sFileOriginPolicyPrefName[] = + "security.fileuri.strict_origin_policy"; + +static const char* kObservedPrefs[] = {sJSEnabledPrefName, + sFileOriginPolicyPrefName, + "capability.policy.", nullptr}; + +///////////////////////////////////////////// +// Constructor, Destructor, Initialization // +///////////////////////////////////////////// +nsScriptSecurityManager::nsScriptSecurityManager(void) + : mPrefInitialized(false), mIsJavaScriptEnabled(false) { + static_assert( + sizeof(intptr_t) == sizeof(void*), + "intptr_t and void* have different lengths on this platform. " + "This may cause a security failure with the SecurityLevel union."); +} + +nsresult nsScriptSecurityManager::Init() { + nsresult rv = CallGetService(NS_IOSERVICE_CONTRACTID, &sIOService); + NS_ENSURE_SUCCESS(rv, rv); + + InitPrefs(); + + // Create our system principal singleton + RefPtr<SystemPrincipal> system = SystemPrincipal::Create(); + + mSystemPrincipal = system; + + return NS_OK; +} + +void nsScriptSecurityManager::InitJSCallbacks(JSContext* aCx) { + //-- Register security check callback in the JS engine + // Currently this is used to control access to function.caller + + static const JSSecurityCallbacks securityCallbacks = { + ContentSecurityPolicyPermitsJSAction, + JSPrincipalsSubsume, + }; + + MOZ_ASSERT(!JS_GetSecurityCallbacks(aCx)); + JS_SetSecurityCallbacks(aCx, &securityCallbacks); + JS_InitDestroyPrincipalsCallback(aCx, nsJSPrincipals::Destroy); + + JS_SetTrustedPrincipals(aCx, BasePrincipal::Cast(mSystemPrincipal)); +} + +/* static */ +void nsScriptSecurityManager::ClearJSCallbacks(JSContext* aCx) { + JS_SetSecurityCallbacks(aCx, nullptr); + JS_SetTrustedPrincipals(aCx, nullptr); +} + +static StaticRefPtr<nsScriptSecurityManager> gScriptSecMan; + +nsScriptSecurityManager::~nsScriptSecurityManager(void) { + Preferences::UnregisterPrefixCallbacks( + nsScriptSecurityManager::ScriptSecurityPrefChanged, kObservedPrefs, this); + if (mDomainPolicy) { + mDomainPolicy->Deactivate(); + } + // ContentChild might hold a reference to the domain policy, + // and it might release it only after the security manager is + // gone. But we can still assert this for the main process. + MOZ_ASSERT_IF(XRE_IsParentProcess(), !mDomainPolicy); +} + +void nsScriptSecurityManager::Shutdown() { + NS_IF_RELEASE(sIOService); + BundleHelper::Shutdown(); +} + +nsScriptSecurityManager* nsScriptSecurityManager::GetScriptSecurityManager() { + return gScriptSecMan; +} + +/* static */ +void nsScriptSecurityManager::InitStatics() { + RefPtr<nsScriptSecurityManager> ssManager = new nsScriptSecurityManager(); + nsresult rv = ssManager->Init(); + if (NS_FAILED(rv)) { + MOZ_CRASH("ssManager->Init() failed"); + } + + ClearOnShutdown(&gScriptSecMan); + gScriptSecMan = ssManager; +} + +// Currently this nsGenericFactory constructor is used only from FastLoad +// (XPCOM object deserialization) code, when "creating" the system principal +// singleton. +already_AddRefed<SystemPrincipal> +nsScriptSecurityManager::SystemPrincipalSingletonConstructor() { + if (gScriptSecMan) + return do_AddRef(gScriptSecMan->mSystemPrincipal) + .downcast<SystemPrincipal>(); + return nullptr; +} + +struct IsWhitespace { + static bool Test(char aChar) { return NS_IsAsciiWhitespace(aChar); }; +}; +struct IsWhitespaceOrComma { + static bool Test(char aChar) { + return aChar == ',' || NS_IsAsciiWhitespace(aChar); + }; +}; + +template <typename Predicate> +uint32_t SkipPast(const nsCString& str, uint32_t base) { + while (base < str.Length() && Predicate::Test(str[base])) { + ++base; + } + return base; +} + +template <typename Predicate> +uint32_t SkipUntil(const nsCString& str, uint32_t base) { + while (base < str.Length() && !Predicate::Test(str[base])) { + ++base; + } + return base; +} + +// static +void nsScriptSecurityManager::ScriptSecurityPrefChanged(const char* aPref, + void* aSelf) { + static_cast<nsScriptSecurityManager*>(aSelf)->ScriptSecurityPrefChanged( + aPref); +} + +inline void nsScriptSecurityManager::ScriptSecurityPrefChanged( + const char* aPref) { + MOZ_ASSERT(mPrefInitialized); + mIsJavaScriptEnabled = + Preferences::GetBool(sJSEnabledPrefName, mIsJavaScriptEnabled); + sStrictFileOriginPolicy = + Preferences::GetBool(sFileOriginPolicyPrefName, false); + mFileURIAllowlist.reset(); +} + +void nsScriptSecurityManager::AddSitesToFileURIAllowlist( + const nsCString& aSiteList) { + for (uint32_t base = SkipPast<IsWhitespace>(aSiteList, 0), bound = 0; + base < aSiteList.Length(); + base = SkipPast<IsWhitespace>(aSiteList, bound)) { + // Grab the current site. + bound = SkipUntil<IsWhitespace>(aSiteList, base); + nsAutoCString site(Substring(aSiteList, base, bound - base)); + + // Check if the URI is schemeless. If so, add both http and https. + nsAutoCString unused; + if (NS_FAILED(sIOService->ExtractScheme(site, unused))) { + AddSitesToFileURIAllowlist("http://"_ns + site); + AddSitesToFileURIAllowlist("https://"_ns + site); + continue; + } + + // Convert it to a URI and add it to our list. + nsCOMPtr<nsIURI> uri; + nsresult rv = NS_NewURI(getter_AddRefs(uri), site); + if (NS_SUCCEEDED(rv)) { + mFileURIAllowlist.ref().AppendElement(uri); + } else { + nsCOMPtr<nsIConsoleService> console( + do_GetService("@mozilla.org/consoleservice;1")); + if (console) { + nsAutoString msg = + u"Unable to to add site to file:// URI allowlist: "_ns + + NS_ConvertASCIItoUTF16(site); + console->LogStringMessage(msg.get()); + } + } + } +} + +nsresult nsScriptSecurityManager::InitPrefs() { + nsIPrefBranch* branch = Preferences::GetRootBranch(); + NS_ENSURE_TRUE(branch, NS_ERROR_FAILURE); + + mPrefInitialized = true; + + // Set the initial value of the "javascript.enabled" prefs + ScriptSecurityPrefChanged(); + + // set observer callbacks in case the value of the prefs change + Preferences::RegisterPrefixCallbacks( + nsScriptSecurityManager::ScriptSecurityPrefChanged, kObservedPrefs, this); + + return NS_OK; +} + +NS_IMETHODIMP +nsScriptSecurityManager::GetDomainPolicyActive(bool* aRv) { + *aRv = !!mDomainPolicy; + return NS_OK; +} + +NS_IMETHODIMP +nsScriptSecurityManager::ActivateDomainPolicy(nsIDomainPolicy** aRv) { + if (!XRE_IsParentProcess()) { + return NS_ERROR_SERVICE_NOT_AVAILABLE; + } + + return ActivateDomainPolicyInternal(aRv); +} + +NS_IMETHODIMP +nsScriptSecurityManager::ActivateDomainPolicyInternal(nsIDomainPolicy** aRv) { + // We only allow one domain policy at a time. The holder of the previous + // policy must explicitly deactivate it first. + if (mDomainPolicy) { + return NS_ERROR_SERVICE_NOT_AVAILABLE; + } + + mDomainPolicy = new DomainPolicy(); + nsCOMPtr<nsIDomainPolicy> ptr = mDomainPolicy; + ptr.forget(aRv); + return NS_OK; +} + +// Intentionally non-scriptable. Script must have a reference to the +// nsIDomainPolicy to deactivate it. +void nsScriptSecurityManager::DeactivateDomainPolicy() { + mDomainPolicy = nullptr; +} + +void nsScriptSecurityManager::CloneDomainPolicy(DomainPolicyClone* aClone) { + MOZ_ASSERT(aClone); + if (mDomainPolicy) { + mDomainPolicy->CloneDomainPolicy(aClone); + } else { + aClone->active() = false; + } +} + +NS_IMETHODIMP +nsScriptSecurityManager::PolicyAllowsScript(nsIURI* aURI, bool* aRv) { + nsresult rv; + + // Compute our rule. If we don't have any domain policy set up that might + // provide exceptions to this rule, we're done. + *aRv = mIsJavaScriptEnabled; + if (!mDomainPolicy) { + return NS_OK; + } + + // We have a domain policy. Grab the appropriate set of exceptions to the + // rule (either the blocklist or the allowlist, depending on whether script + // is enabled or disabled by default). + nsCOMPtr<nsIDomainSet> exceptions; + nsCOMPtr<nsIDomainSet> superExceptions; + if (*aRv) { + mDomainPolicy->GetBlocklist(getter_AddRefs(exceptions)); + mDomainPolicy->GetSuperBlocklist(getter_AddRefs(superExceptions)); + } else { + mDomainPolicy->GetAllowlist(getter_AddRefs(exceptions)); + mDomainPolicy->GetSuperAllowlist(getter_AddRefs(superExceptions)); + } + + bool contains; + rv = exceptions->Contains(aURI, &contains); + NS_ENSURE_SUCCESS(rv, rv); + if (contains) { + *aRv = !*aRv; + return NS_OK; + } + rv = superExceptions->ContainsSuperDomain(aURI, &contains); + NS_ENSURE_SUCCESS(rv, rv); + if (contains) { + *aRv = !*aRv; + } + + return NS_OK; +} + +const nsTArray<nsCOMPtr<nsIURI>>& +nsScriptSecurityManager::EnsureFileURIAllowlist() { + if (mFileURIAllowlist.isSome()) { + return mFileURIAllowlist.ref(); + } + + // + // Rebuild the set of principals for which we allow file:// URI loads. This + // implements a small subset of an old pref-based CAPS people that people + // have come to depend on. See bug 995943. + // + + mFileURIAllowlist.emplace(); + nsAutoCString policies; + mozilla::Preferences::GetCString("capability.policy.policynames", policies); + for (uint32_t base = SkipPast<IsWhitespaceOrComma>(policies, 0), bound = 0; + base < policies.Length(); + base = SkipPast<IsWhitespaceOrComma>(policies, bound)) { + // Grab the current policy name. + bound = SkipUntil<IsWhitespaceOrComma>(policies, base); + auto policyName = Substring(policies, base, bound - base); + + // Figure out if this policy allows loading file:// URIs. If not, we can + // skip it. + nsCString checkLoadURIPrefName = + "capability.policy."_ns + policyName + ".checkloaduri.enabled"_ns; + nsAutoString value; + nsresult rv = Preferences::GetString(checkLoadURIPrefName.get(), value); + if (NS_FAILED(rv) || !value.LowerCaseEqualsLiteral("allaccess")) { + continue; + } + + // Grab the list of domains associated with this policy. + nsCString domainPrefName = + "capability.policy."_ns + policyName + ".sites"_ns; + nsAutoCString siteList; + Preferences::GetCString(domainPrefName.get(), siteList); + AddSitesToFileURIAllowlist(siteList); + } + + return mFileURIAllowlist.ref(); +} |