1 files changed, 294 insertions, 0 deletions
diff --git a/caps/NullPrincipal.cpp b/caps/NullPrincipal.cpp
new file mode 100644
index 0000000000..0047d06dec
--- /dev/null
+++ b/caps/NullPrincipal.cpp
@@ -0,0 +1,294 @@
+/* -*- 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 "nsDocShell.h"
+#include "NullPrincipal.h"
+#include "NullPrincipalURI.h"
+#include "nsMemory.h"
+#include "nsIClassInfoImpl.h"
+#include "nsNetCID.h"
+#include "nsError.h"
+#include "ContentPrincipal.h"
+#include "nsScriptSecurityManager.h"
+#include "pratom.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, nsISerializable)
+NS_IMPL_CI_INTERFACE_GETTER(NullPrincipal, nsIPrincipal, nsISerializable)
+
+/* static */
+already_AddRefed<NullPrincipal> NullPrincipal::CreateWithInheritedAttributes(
+    nsIPrincipal* aInheritFrom) {
+  MOZ_ASSERT(aInheritFrom);
+  return CreateWithInheritedAttributes(
+      Cast(aInheritFrom)->OriginAttributesRef(), false);
+}
+
+/* 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) {
+  RefPtr<NullPrincipal> nullPrin = new NullPrincipal();
+  nsresult rv = nullPrin->Init(aOriginAttributes, aIsFirstParty);
+  MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
+
+  return nullPrin.forget();
+}
+
+/* static */
+already_AddRefed<NullPrincipal> NullPrincipal::Create(
+    const OriginAttributes& aOriginAttributes, nsIURI* aURI) {
+  RefPtr<NullPrincipal> nullPrin = new NullPrincipal();
+  nsresult rv = nullPrin->Init(aOriginAttributes, aURI);
+  MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
+
+  return nullPrin.forget();
+}
+
+/* static */
+already_AddRefed<NullPrincipal> NullPrincipal::CreateWithoutOriginAttributes() {
+  return NullPrincipal::Create(OriginAttributes(), nullptr);
+}
+
+nsresult NullPrincipal::Init(const OriginAttributes& aOriginAttributes,
+                             nsIURI* aURI) {
+  if (aURI) {
+    nsAutoCString scheme;
+    nsresult rv = aURI->GetScheme(scheme);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    NS_ENSURE_TRUE(scheme.EqualsLiteral(NS_NULLPRINCIPAL_SCHEME),
+                   NS_ERROR_NOT_AVAILABLE);
+
+    mURI = aURI;
+  } else {
+    mURI = new NullPrincipalURI();
+  }
+
+  nsAutoCString originNoSuffix;
+  DebugOnly<nsresult> rv = mURI->GetSpec(originNoSuffix);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  FinishInit(originNoSuffix, aOriginAttributes);
+
+  return NS_OK;
+}
+
+nsresult NullPrincipal::Init(const OriginAttributes& aOriginAttributes,
+                             bool aIsFirstParty, nsIURI* aURI) {
+  if (aURI) {
+    nsAutoCString scheme;
+    nsresult rv = aURI->GetScheme(scheme);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    NS_ENSURE_TRUE(scheme.EqualsLiteral(NS_NULLPRINCIPAL_SCHEME),
+                   NS_ERROR_NOT_AVAILABLE);
+
+    mURI = aURI;
+  } else {
+    mURI = new NullPrincipalURI();
+  }
+
+  nsAutoCString originNoSuffix;
+  DebugOnly<nsresult> rv = mURI->GetSpec(originNoSuffix);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  nsAutoCString path;
+  rv = mURI->GetPathQueryRef(path);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  OriginAttributes attrs(aOriginAttributes);
+  if (aIsFirstParty) {
+    // remove the '{}' characters from both ends.
+    path.Mid(path, 1, path.Length() - 2);
+    path.AppendLiteral(".mozilla");
+    attrs.SetFirstPartyDomain(true, path);
+  }
+
+  FinishInit(originNoSuffix, attrs);
+
+  return NS_OK;
+}
+
+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::Read(nsIObjectInputStream* aStream) {
+  // Note - NullPrincipal use NS_GENERIC_FACTORY_CONSTRUCTOR_INIT, which means
+  // that the Init() method has already been invoked by the time we deserialize.
+  // This is in contrast to ContentPrincipal, which uses
+  // NS_GENERIC_FACTORY_CONSTRUCTOR, in which case ::Read needs to invoke
+  // Init().
+
+  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);
+
+  return Init(attrs, uri);
+}
+
+NS_IMETHODIMP
+NullPrincipal::Write(nsIObjectOutputStream* aStream) {
+  // Read is used still for legacy principals
+  MOZ_RELEASE_ASSERT(false, "Old style serialization is removed");
+  return NS_OK;
+}
+
+nsresult NullPrincipal::PopulateJSONObject(Json::Value& aObject) {
+  nsAutoCString principalURI;
+  nsresult rv = mURI->GetSpec(principalURI);
+  NS_ENSURE_SUCCESS(rv, rv);
+  MOZ_ASSERT(principalURI.Length() ==
+                 nsLiteralCString(NS_NULLPRINCIPAL_SCHEME ":").Length() +
+                     NSID_LENGTH - 1,
+             "Length of the URI should be: (scheme, uuid, - nullptr)");
+  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;
+  }
+
+  RefPtr<NullPrincipal> nullPrincipal = new NullPrincipal();
+  rv = nullPrincipal->Init(attrs, uri);
+  if (NS_FAILED(rv)) {
+    return nullptr;
+  }
+  return nullPrincipal.forget();
+}