caps/DomainPolicy.cpp
author Andrea Marchesini <amarchesini@mozilla.com>
Wed, 31 Oct 2018 18:30:18 +0100
changeset 500246 544498045a9cfe55968fa6500bffbc3181869fce
parent 457926 d46afbe90f3c9dbeb0379d40f8292004dc5c6916
child 500220 f3a78d65b0590610e4f863db4dce834303fc8b94
permissions -rw-r--r--
Bug 1486698 - Update Fetch+Stream implementation to throw when the stream is disturbed or locked, r=bz In this patch, I went through any place in DOM fetch code, where there are ReadableStreams and update the locked, disturbed, readable checks. Because we expose streams more often, we need an extra care in the use of ErrorResult objects. JS streams can now throw exceptions and we need to handle them. This patch also fixes a bug in FileStreamReader::CloseAndRelease() which could be called in case mReader creation fails.

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=4 et sw=4 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 "DomainPolicy.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/ipc/URIUtils.h"
#include "mozilla/Unused.h"
#include "nsIMessageManager.h"
#include "nsIURIMutator.h"
#include "nsScriptSecurityManager.h"

namespace mozilla {

using namespace ipc;
using namespace dom;

NS_IMPL_ISUPPORTS(DomainPolicy, nsIDomainPolicy)

static nsresult
BroadcastDomainSetChange(DomainSetType aSetType, DomainSetChangeType aChangeType,
                         nsIURI* aDomain = nullptr)
{
    MOZ_ASSERT(XRE_IsParentProcess(),
               "DomainPolicy should only be exposed to the chrome process.");

    nsTArray<ContentParent*> parents;
    ContentParent::GetAll(parents);
    if (!parents.Length()) {
       return NS_OK;
    }

    OptionalURIParams uri;
    SerializeURI(aDomain, uri);

    for (uint32_t i = 0; i < parents.Length(); i++) {
        Unused << parents[i]->SendDomainSetChanged(aSetType, aChangeType, uri);
    }
    return NS_OK;
}

DomainPolicy::DomainPolicy() : mBlacklist(new DomainSet(BLACKLIST))
                             , mSuperBlacklist(new DomainSet(SUPER_BLACKLIST))
                             , mWhitelist(new DomainSet(WHITELIST))
                             , mSuperWhitelist(new DomainSet(SUPER_WHITELIST))
{
    if (XRE_IsParentProcess()) {
        BroadcastDomainSetChange(NO_TYPE, ACTIVATE_POLICY);
    }
}

DomainPolicy::~DomainPolicy()
{
    // The SSM holds a strong ref to the DomainPolicy until Deactivate() is
    // invoked, so we should never hit the destructor until that happens.
    MOZ_ASSERT(!mBlacklist && !mSuperBlacklist &&
               !mWhitelist && !mSuperWhitelist);
}


NS_IMETHODIMP
DomainPolicy::GetBlacklist(nsIDomainSet** aSet)
{
    nsCOMPtr<nsIDomainSet> set = mBlacklist.get();
    set.forget(aSet);
    return NS_OK;
}

NS_IMETHODIMP
DomainPolicy::GetSuperBlacklist(nsIDomainSet** aSet)
{
    nsCOMPtr<nsIDomainSet> set = mSuperBlacklist.get();
    set.forget(aSet);
    return NS_OK;
}

NS_IMETHODIMP
DomainPolicy::GetWhitelist(nsIDomainSet** aSet)
{
    nsCOMPtr<nsIDomainSet> set = mWhitelist.get();
    set.forget(aSet);
    return NS_OK;
}

NS_IMETHODIMP
DomainPolicy::GetSuperWhitelist(nsIDomainSet** aSet)
{
    nsCOMPtr<nsIDomainSet> set = mSuperWhitelist.get();
    set.forget(aSet);
    return NS_OK;
}

NS_IMETHODIMP
DomainPolicy::Deactivate()
{
    // Clear the hashtables first to free up memory, since script might
    // hold the doomed sets alive indefinitely.
    mBlacklist->Clear();
    mSuperBlacklist->Clear();
    mWhitelist->Clear();
    mSuperWhitelist->Clear();

    // Null them out.
    mBlacklist = nullptr;
    mSuperBlacklist = nullptr;
    mWhitelist = nullptr;
    mSuperWhitelist = nullptr;

    // Inform the SSM.
    nsScriptSecurityManager* ssm = nsScriptSecurityManager::GetScriptSecurityManager();
    if (ssm) {
        ssm->DeactivateDomainPolicy();
    }
    if (XRE_IsParentProcess()) {
        BroadcastDomainSetChange(NO_TYPE, DEACTIVATE_POLICY);
    }
    return NS_OK;
}

void
DomainPolicy::CloneDomainPolicy(DomainPolicyClone* aClone)
{
    aClone->active() = true;
    mBlacklist->CloneSet(&aClone->blacklist());
    mSuperBlacklist->CloneSet(&aClone->superBlacklist());
    mWhitelist->CloneSet(&aClone->whitelist());
    mSuperWhitelist->CloneSet(&aClone->superWhitelist());
}

static
void
CopyURIs(const InfallibleTArray<URIParams>& aDomains, nsIDomainSet* aSet)
{
    for (uint32_t i = 0; i < aDomains.Length(); i++) {
        nsCOMPtr<nsIURI> uri = DeserializeURI(aDomains[i]);
        aSet->Add(uri);
    }
}

void
DomainPolicy::ApplyClone(const DomainPolicyClone* aClone)
{
    CopyURIs(aClone->blacklist(), mBlacklist);
    CopyURIs(aClone->whitelist(), mWhitelist);
    CopyURIs(aClone->superBlacklist(), mSuperBlacklist);
    CopyURIs(aClone->superWhitelist(), mSuperWhitelist);
}

static already_AddRefed<nsIURI>
GetCanonicalClone(nsIURI* aURI)
{
    nsCOMPtr<nsIURI> clone;
    nsresult rv = NS_MutateURI(aURI)
           .SetUserPass(EmptyCString())
           .SetPathQueryRef(EmptyCString())
           .Finalize(clone);
    NS_ENSURE_SUCCESS(rv, nullptr);
    return clone.forget();
}

NS_IMPL_ISUPPORTS(DomainSet, nsIDomainSet)

NS_IMETHODIMP
DomainSet::Add(nsIURI* aDomain)
{
    nsCOMPtr<nsIURI> clone = GetCanonicalClone(aDomain);
    NS_ENSURE_TRUE(clone, NS_ERROR_FAILURE);
    mHashTable.PutEntry(clone);
    if (XRE_IsParentProcess())
        return BroadcastDomainSetChange(mType, ADD_DOMAIN, aDomain);

    return NS_OK;
}

NS_IMETHODIMP
DomainSet::Remove(nsIURI* aDomain)
{
    nsCOMPtr<nsIURI> clone = GetCanonicalClone(aDomain);
    NS_ENSURE_TRUE(clone, NS_ERROR_FAILURE);
    mHashTable.RemoveEntry(clone);
    if (XRE_IsParentProcess())
        return BroadcastDomainSetChange(mType, REMOVE_DOMAIN, aDomain);

    return NS_OK;
}

NS_IMETHODIMP
DomainSet::Clear()
{
    mHashTable.Clear();
    if (XRE_IsParentProcess())
        return BroadcastDomainSetChange(mType, CLEAR_DOMAINS);

    return NS_OK;
}

NS_IMETHODIMP
DomainSet::Contains(nsIURI* aDomain, bool* aContains)
{
    *aContains = false;
    nsCOMPtr<nsIURI> clone = GetCanonicalClone(aDomain);
    NS_ENSURE_TRUE(clone, NS_ERROR_FAILURE);
    *aContains = mHashTable.Contains(clone);
    return NS_OK;
}

NS_IMETHODIMP
DomainSet::ContainsSuperDomain(nsIURI* aDomain, bool* aContains)
{
    *aContains = false;
    nsCOMPtr<nsIURI> clone = GetCanonicalClone(aDomain);
    NS_ENSURE_TRUE(clone, NS_ERROR_FAILURE);
    nsAutoCString domain;
    nsresult rv = clone->GetHost(domain);
    NS_ENSURE_SUCCESS(rv, rv);
    while (true) {
        // Check the current domain.
        if (mHashTable.Contains(clone)) {
            *aContains = true;
            return NS_OK;
        }

        // Chop off everything before the first dot, or break if there are no
        // dots left.
        int32_t index = domain.Find(".");
        if (index == kNotFound)
            break;
        domain.Assign(Substring(domain, index + 1));
        rv = NS_MutateURI(clone)
               .SetHost(domain)
               .Finalize(clone);
        NS_ENSURE_SUCCESS(rv, rv);
    }

    // No match.
    return NS_OK;

}

NS_IMETHODIMP
DomainSet::GetType(uint32_t* aType)
{
    *aType = mType;
    return NS_OK;
}

void
DomainSet::CloneSet(InfallibleTArray<URIParams>* aDomains)
{
    for (auto iter = mHashTable.Iter(); !iter.Done(); iter.Next()) {
        nsIURI* key = iter.Get()->GetKey();

        URIParams uri;
        SerializeURI(key, uri);

        aDomains->AppendElement(uri);
    }
}

} /* namespace mozilla */