gecko-dev/caps/NullPrincipal.cpp
Nika Layzell e620d25a35 Bug 1715167 - Part 6: Use the unsandboxed result principal as precursor for sandbox principals, r=ckerschb,ngogge
This change stores a generated nsID directly on the LoadInfo, rather
than the full SandboxedLoadingPrincipal. This allows for the sandboxed
principal to be constructed from GetChannelResultPrincipal using the
unsandboxed result principal as a precursor, rather than the loading
principal.

The nsID is reset by HttpChannelBase whenever a non-internal redirect
occurs to reduce the chance of multiple null result principals during a
redirect with the same nsID, but different precursors.

Depends on D119692

Differential Revision: https://phabricator.services.mozilla.com/D119693
2021-07-15 21:09:15 +00:00

347 lines
10 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 sts=2 ts=2 et 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/. */
/**
* This is the principal that has no rights and can't be accessed by
* anything other than itself and chrome; null principals are not
* same-origin with anything but themselves.
*/
#include "mozilla/ArrayUtils.h"
#include "mozilla/dom/BlobURLProtocolHandler.h"
#include "mozilla/StaticPrefs_network.h"
#include "nsDocShell.h"
#include "NullPrincipal.h"
#include "DefaultURI.h"
#include "nsSimpleURI.h"
#include "nsMemory.h"
#include "nsIClassInfoImpl.h"
#include "nsNetCID.h"
#include "nsError.h"
#include "ContentPrincipal.h"
#include "nsScriptSecurityManager.h"
#include "pratom.h"
#include "nsIObjectInputStream.h"
#include "mozilla/GkRustUtils.h"
#include "json/json.h"
using namespace mozilla;
NS_IMPL_CLASSINFO(NullPrincipal, nullptr, nsIClassInfo::MAIN_THREAD_ONLY,
NS_NULLPRINCIPAL_CID)
NS_IMPL_QUERY_INTERFACE_CI(NullPrincipal, nsIPrincipal)
NS_IMPL_CI_INTERFACE_GETTER(NullPrincipal, nsIPrincipal)
NullPrincipal::NullPrincipal(nsIURI* aURI, const nsACString& aOriginNoSuffix,
const OriginAttributes& aOriginAttributes)
: BasePrincipal(eNullPrincipal, aOriginNoSuffix, aOriginAttributes),
mURI(aURI) {}
/* static */
already_AddRefed<NullPrincipal> NullPrincipal::CreateWithInheritedAttributes(
nsIPrincipal* aInheritFrom) {
MOZ_ASSERT(aInheritFrom);
return CreateInternal(Cast(aInheritFrom)->OriginAttributesRef(), false,
nullptr, aInheritFrom);
}
/* static */
already_AddRefed<NullPrincipal> NullPrincipal::CreateWithInheritedAttributes(
nsIDocShell* aDocShell, bool aIsFirstParty) {
MOZ_ASSERT(aDocShell);
OriginAttributes attrs = nsDocShell::Cast(aDocShell)->GetOriginAttributes();
return CreateWithInheritedAttributes(attrs, aIsFirstParty);
}
/* static */
already_AddRefed<NullPrincipal> NullPrincipal::CreateWithInheritedAttributes(
const OriginAttributes& aOriginAttributes, bool aIsFirstParty) {
return CreateInternal(aOriginAttributes, aIsFirstParty);
}
/* static */
already_AddRefed<NullPrincipal> NullPrincipal::Create(
const OriginAttributes& aOriginAttributes, nsIURI* aURI) {
return CreateInternal(aOriginAttributes, false, aURI);
}
/* static */
already_AddRefed<NullPrincipal> NullPrincipal::CreateWithoutOriginAttributes() {
return NullPrincipal::Create(OriginAttributes(), nullptr);
}
already_AddRefed<nsIURI> NullPrincipal::CreateURI(
nsIPrincipal* aPrecursor, const nsID* aNullPrincipalID) {
nsCOMPtr<nsIURIMutator> iMutator;
if (StaticPrefs::network_url_useDefaultURI()) {
iMutator = new mozilla::net::DefaultURI::Mutator();
} else {
iMutator = new mozilla::net::nsSimpleURI::Mutator();
}
nsAutoCStringN<NSID_LENGTH> uuid;
if (aNullPrincipalID) {
// FIXME: When D119267 lands, clean this up on top of those changes.
aNullPrincipalID->ToProvidedString(*reinterpret_cast<char(*)[NSID_LENGTH]>(
uuid.GetMutableData(NSID_LENGTH - 1).data()));
} else {
GkRustUtils::GenerateUUID(uuid);
}
NS_MutateURI mutator(iMutator);
mutator.SetSpec(NS_NULLPRINCIPAL_SCHEME ":"_ns + uuid);
// If there's a precursor URI, encode it in the null principal URI's query.
if (aPrecursor) {
nsAutoCString precursorOrigin;
switch (BasePrincipal::Cast(aPrecursor)->Kind()) {
case eNullPrincipal:
// If the precursor null principal has a precursor, inherit it.
if (nsCOMPtr<nsIURI> nullPrecursorURI = aPrecursor->GetURI()) {
MOZ_ALWAYS_SUCCEEDS(nullPrecursorURI->GetQuery(precursorOrigin));
}
break;
case eContentPrincipal:
MOZ_ALWAYS_SUCCEEDS(aPrecursor->GetOriginNoSuffix(precursorOrigin));
break;
// For now, we won't track expanded or system principal precursors. We may
// want to track expanded principal precursors in the future, but it's
// unlikely we'll want to track system principal precursors.
case eExpandedPrincipal:
case eSystemPrincipal:
break;
}
if (!precursorOrigin.IsEmpty()) {
mutator.SetQuery(precursorOrigin);
}
}
nsCOMPtr<nsIURI> uri;
MOZ_ALWAYS_SUCCEEDS(mutator.Finalize(getter_AddRefs(uri)));
return uri.forget();
}
already_AddRefed<NullPrincipal> NullPrincipal::CreateInternal(
const OriginAttributes& aOriginAttributes, bool aIsFirstParty, nsIURI* aURI,
nsIPrincipal* aPrecursor) {
MOZ_ASSERT_IF(aPrecursor, !aURI);
nsCOMPtr<nsIURI> uri = aURI;
if (!uri) {
uri = NullPrincipal::CreateURI(aPrecursor);
}
MOZ_RELEASE_ASSERT(uri->SchemeIs(NS_NULLPRINCIPAL_SCHEME));
nsAutoCString originNoSuffix;
DebugOnly<nsresult> rv = uri->GetSpec(originNoSuffix);
MOZ_ASSERT(NS_SUCCEEDED(rv));
OriginAttributes attrs(aOriginAttributes);
if (aIsFirstParty) {
// The FirstPartyDomain attribute will not include information about the
// precursor origin.
nsAutoCString path;
rv = uri->GetFilePath(path);
MOZ_ASSERT(NS_SUCCEEDED(rv));
// remove the '{}' characters from both ends.
path.Mid(path, 1, path.Length() - 2);
path.AppendLiteral(".mozilla");
attrs.SetFirstPartyDomain(true, path);
}
RefPtr<NullPrincipal> nullPrin =
new NullPrincipal(uri, originNoSuffix, attrs);
return nullPrin.forget();
}
nsresult NullPrincipal::GetScriptLocation(nsACString& aStr) {
return mURI->GetSpec(aStr);
}
/**
* nsIPrincipal implementation
*/
uint32_t NullPrincipal::GetHashValue() { return (NS_PTR_TO_INT32(this) >> 2); }
NS_IMETHODIMP
NullPrincipal::GetURI(nsIURI** aURI) {
nsCOMPtr<nsIURI> uri = mURI;
uri.forget(aURI);
return NS_OK;
}
NS_IMETHODIMP
NullPrincipal::GetIsOriginPotentiallyTrustworthy(bool* aResult) {
*aResult = false;
return NS_OK;
}
NS_IMETHODIMP
NullPrincipal::GetDomain(nsIURI** aDomain) {
nsCOMPtr<nsIURI> uri = mURI;
uri.forget(aDomain);
return NS_OK;
}
NS_IMETHODIMP
NullPrincipal::SetDomain(nsIURI* aDomain) {
// I think the right thing to do here is to just throw... Silently failing
// seems counterproductive.
return NS_ERROR_NOT_AVAILABLE;
}
bool NullPrincipal::MayLoadInternal(nsIURI* aURI) {
// Also allow the load if we are the principal of the URI being checked.
nsCOMPtr<nsIPrincipal> blobPrincipal;
if (dom::BlobURLProtocolHandler::GetBlobURLPrincipal(
aURI, getter_AddRefs(blobPrincipal))) {
MOZ_ASSERT(blobPrincipal);
return SubsumesInternal(blobPrincipal,
BasePrincipal::ConsiderDocumentDomain);
}
return false;
}
NS_IMETHODIMP
NullPrincipal::GetBaseDomain(nsACString& aBaseDomain) {
// For a null principal, we use our unique uuid as the base domain.
return mURI->GetPathQueryRef(aBaseDomain);
}
NS_IMETHODIMP
NullPrincipal::GetAddonId(nsAString& aAddonId) {
aAddonId.Truncate();
return NS_OK;
};
/**
* nsISerializable implementation
*/
NS_IMETHODIMP
NullPrincipal::Deserializer::Read(nsIObjectInputStream* aStream) {
nsAutoCString spec;
nsresult rv = aStream->ReadCString(spec);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIURI> uri;
rv = NS_NewURI(getter_AddRefs(uri), spec);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString suffix;
rv = aStream->ReadCString(suffix);
NS_ENSURE_SUCCESS(rv, rv);
OriginAttributes attrs;
bool ok = attrs.PopulateFromSuffix(suffix);
NS_ENSURE_TRUE(ok, NS_ERROR_FAILURE);
mPrincipal = NullPrincipal::Create(attrs, uri);
NS_ENSURE_TRUE(mPrincipal, NS_ERROR_FAILURE);
return NS_OK;
}
nsresult NullPrincipal::PopulateJSONObject(Json::Value& aObject) {
nsAutoCString principalURI;
nsresult rv = mURI->GetSpec(principalURI);
NS_ENSURE_SUCCESS(rv, rv);
aObject[std::to_string(eSpec)] = principalURI.get();
nsAutoCString suffix;
OriginAttributesRef().CreateSuffix(suffix);
if (suffix.Length() > 0) {
aObject[std::to_string(eSuffix)] = suffix.get();
}
return NS_OK;
}
already_AddRefed<BasePrincipal> NullPrincipal::FromProperties(
nsTArray<NullPrincipal::KeyVal>& aFields) {
MOZ_ASSERT(aFields.Length() == eMax + 1, "Must have all the keys");
nsresult rv;
nsCOMPtr<nsIURI> uri;
OriginAttributes attrs;
// The odd structure here is to make the code to not compile
// if all the switch enum cases haven't been codified
for (const auto& field : aFields) {
switch (field.key) {
case NullPrincipal::eSpec:
if (!field.valueWasSerialized) {
MOZ_ASSERT(false,
"Null principals require a spec URI in serialized JSON");
return nullptr;
}
rv = NS_NewURI(getter_AddRefs(uri), field.value);
NS_ENSURE_SUCCESS(rv, nullptr);
break;
case NullPrincipal::eSuffix:
bool ok = attrs.PopulateFromSuffix(field.value);
if (!ok) {
return nullptr;
}
break;
}
}
if (!uri) {
MOZ_ASSERT(false, "No URI deserialized");
return nullptr;
}
return NullPrincipal::Create(attrs, uri);
}
NS_IMETHODIMP
NullPrincipal::GetPrecursorPrincipal(nsIPrincipal** aPrincipal) {
*aPrincipal = nullptr;
nsAutoCString query;
if (NS_FAILED(mURI->GetQuery(query)) || query.IsEmpty()) {
return NS_OK;
}
nsCOMPtr<nsIURI> precursorURI;
if (NS_FAILED(NS_NewURI(getter_AddRefs(precursorURI), query))) {
MOZ_ASSERT_UNREACHABLE(
"Failed to parse precursor from nullprincipal query");
return NS_OK;
}
// If our precursor is another null principal, re-construct it. This can
// happen if a null principal without a precursor causes another principal to
// be created.
if (precursorURI->SchemeIs(NS_NULLPRINCIPAL_SCHEME)) {
#ifdef DEBUG
nsAutoCString precursorQuery;
precursorURI->GetQuery(precursorQuery);
MOZ_ASSERT(precursorQuery.IsEmpty(),
"Null principal with nested precursors?");
#endif
*aPrincipal =
NullPrincipal::Create(OriginAttributesRef(), precursorURI).take();
return NS_OK;
}
RefPtr<BasePrincipal> contentPrincipal =
BasePrincipal::CreateContentPrincipal(precursorURI,
OriginAttributesRef());
// If `CreateContentPrincipal` failed, it will create a new NullPrincipal and
// return that instead. We only want to return real content principals here.
if (!contentPrincipal || !contentPrincipal->Is<ContentPrincipal>()) {
return NS_OK;
}
contentPrincipal.forget(aPrincipal);
return NS_OK;
}