2004-11-08 18:37:32 +03:00
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is content blocker code.
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*
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* The Initial Developer of the Original Code is
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* Michiel van Leeuwen <mvl@exedo.nl>.
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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2011-10-11 09:50:08 +04:00
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2004-11-08 18:37:32 +03:00
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#include "nsContentBlocker.h"
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#include "nsIDocument.h"
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#include "nsIContent.h"
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#include "nsIURI.h"
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#include "nsIServiceManager.h"
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#include "nsIDocShellTreeItem.h"
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#include "nsIPrefService.h"
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#include "nsIPrefBranch.h"
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#include "nsIDocShell.h"
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#include "nsString.h"
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#include "nsContentPolicyUtils.h"
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2006-04-24 23:56:18 +04:00
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#include "nsIObjectLoadingContent.h"
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2004-11-08 18:37:32 +03:00
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// Possible behavior pref values
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// Those map to the nsIPermissionManager values where possible
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#define BEHAVIOR_ACCEPT nsIPermissionManager::ALLOW_ACTION
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#define BEHAVIOR_REJECT nsIPermissionManager::DENY_ACTION
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#define BEHAVIOR_NOFOREIGN 3
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// From nsIContentPolicy
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2011-09-09 00:20:44 +04:00
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static const char *kTypeString[] = {"other",
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"script",
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"image",
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"stylesheet",
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"object",
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"document",
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"subdocument",
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"refresh",
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"xbl",
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"ping",
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"xmlhttprequest",
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"objectsubrequest",
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"dtd",
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"font",
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2011-12-08 03:19:43 +04:00
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"media",
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"websocket"};
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2004-11-08 18:37:32 +03:00
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2011-09-09 00:20:44 +04:00
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#define NUMBER_OF_TYPES NS_ARRAY_LENGTH(kTypeString)
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PRUint8 nsContentBlocker::mBehaviorPref[NUMBER_OF_TYPES];
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2004-11-08 18:37:32 +03:00
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NS_IMPL_ISUPPORTS3(nsContentBlocker,
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nsIContentPolicy,
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nsIObserver,
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nsSupportsWeakReference)
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nsContentBlocker::nsContentBlocker()
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{
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memset(mBehaviorPref, BEHAVIOR_ACCEPT, NUMBER_OF_TYPES);
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}
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nsresult
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nsContentBlocker::Init()
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{
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nsresult rv;
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mPermissionManager = do_GetService(NS_PERMISSIONMANAGER_CONTRACTID, &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsIPrefService> prefService = do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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nsCOMPtr<nsIPrefBranch> prefBranch;
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rv = prefService->GetBranch("permissions.default.", getter_AddRefs(prefBranch));
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NS_ENSURE_SUCCESS(rv, rv);
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2004-12-15 21:31:23 +03:00
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// Migrate old image blocker pref
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nsCOMPtr<nsIPrefBranch> oldPrefBranch;
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oldPrefBranch = do_QueryInterface(prefService);
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PRInt32 oldPref;
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2005-02-02 14:18:20 +03:00
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rv = oldPrefBranch->GetIntPref("network.image.imageBehavior", &oldPref);
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if (NS_SUCCEEDED(rv) && oldPref) {
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2004-12-15 21:31:23 +03:00
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PRInt32 newPref;
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switch (oldPref) {
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default:
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newPref = BEHAVIOR_ACCEPT;
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break;
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case 1:
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newPref = BEHAVIOR_NOFOREIGN;
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break;
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case 2:
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newPref = BEHAVIOR_REJECT;
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break;
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}
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prefBranch->SetIntPref("image", newPref);
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oldPrefBranch->ClearUserPref("network.image.imageBehavior");
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}
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2004-11-08 18:37:32 +03:00
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// The branch is not a copy of the prefservice, but a new object, because
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// it is a non-default branch. Adding obeservers to it will only work if
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// we make sure that the object doesn't die. So, keep a reference to it.
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mPrefBranchInternal = do_QueryInterface(prefBranch, &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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2011-10-17 18:59:28 +04:00
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rv = mPrefBranchInternal->AddObserver("", this, true);
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2004-11-08 18:37:32 +03:00
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PrefChanged(prefBranch, nsnull);
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return rv;
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}
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#undef LIMIT
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#define LIMIT(x, low, high, default) ((x) >= (low) && (x) <= (high) ? (x) : (default))
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void
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nsContentBlocker::PrefChanged(nsIPrefBranch *aPrefBranch,
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const char *aPref)
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{
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PRInt32 val;
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#define PREF_CHANGED(_P) (!aPref || !strcmp(aPref, _P))
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for(PRUint32 i = 0; i < NUMBER_OF_TYPES; ++i) {
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if (PREF_CHANGED(kTypeString[i]) &&
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NS_SUCCEEDED(aPrefBranch->GetIntPref(kTypeString[i], &val)))
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mBehaviorPref[i] = LIMIT(val, 1, 3, 1);
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}
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}
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// nsIContentPolicy Implementation
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NS_IMETHODIMP
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nsContentBlocker::ShouldLoad(PRUint32 aContentType,
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nsIURI *aContentLocation,
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nsIURI *aRequestingLocation,
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nsISupports *aRequestingContext,
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const nsACString &aMimeGuess,
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nsISupports *aExtra,
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PRInt16 *aDecision)
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{
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*aDecision = nsIContentPolicy::ACCEPT;
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nsresult rv;
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// Ony support NUMBER_OF_TYPES content types. that all there is at the
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// moment, but you never know...
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if (aContentType > NUMBER_OF_TYPES)
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return NS_OK;
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// we can't do anything without this
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if (!aContentLocation)
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return NS_OK;
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// we only want to check http, https, ftp
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// for chrome:// and resources and others, no need to check.
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nsCAutoString scheme;
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aContentLocation->GetScheme(scheme);
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if (!scheme.LowerCaseEqualsLiteral("ftp") &&
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!scheme.LowerCaseEqualsLiteral("http") &&
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!scheme.LowerCaseEqualsLiteral("https"))
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return NS_OK;
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2011-09-29 10:19:26 +04:00
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bool shouldLoad, fromPrefs;
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2004-12-15 21:31:23 +03:00
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rv = TestPermission(aContentLocation, aRequestingLocation, aContentType,
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&shouldLoad, &fromPrefs);
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2004-11-08 18:37:32 +03:00
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NS_ENSURE_SUCCESS(rv, rv);
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2009-07-21 02:29:32 +04:00
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if (!shouldLoad) {
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if (fromPrefs) {
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2004-12-15 21:31:23 +03:00
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*aDecision = nsIContentPolicy::REJECT_TYPE;
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2009-07-21 02:29:32 +04:00
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} else {
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2004-12-15 21:31:23 +03:00
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*aDecision = nsIContentPolicy::REJECT_SERVER;
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2009-07-21 02:29:32 +04:00
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}
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}
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2006-04-24 23:56:18 +04:00
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if (aContentType != nsIContentPolicy::TYPE_OBJECT || aMimeGuess.IsEmpty())
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return NS_OK;
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// For TYPE_OBJECT we should check what aMimeGuess might tell us
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// about what sort of object it is.
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nsCOMPtr<nsIObjectLoadingContent> objectLoader =
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do_QueryInterface(aRequestingContext);
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if (!objectLoader)
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return NS_OK;
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PRUint32 contentType;
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rv = objectLoader->GetContentTypeForMIMEType(aMimeGuess, &contentType);
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if (NS_FAILED(rv))
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return rv;
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switch (contentType) {
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case nsIObjectLoadingContent::TYPE_IMAGE:
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aContentType = nsIContentPolicy::TYPE_IMAGE;
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break;
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case nsIObjectLoadingContent::TYPE_DOCUMENT:
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aContentType = nsIContentPolicy::TYPE_SUBDOCUMENT;
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break;
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default:
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return NS_OK;
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}
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NS_ASSERTION(aContentType != nsIContentPolicy::TYPE_OBJECT,
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2006-04-25 00:25:56 +04:00
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"Shouldn't happen. Infinite loops are bad!");
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2006-04-24 23:56:18 +04:00
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// Found a type that tells us more about what we're loading. Try
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// the permissions check again!
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return ShouldLoad(aContentType, aContentLocation, aRequestingLocation,
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aRequestingContext, aMimeGuess, aExtra, aDecision);
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2004-11-08 18:37:32 +03:00
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}
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NS_IMETHODIMP
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nsContentBlocker::ShouldProcess(PRUint32 aContentType,
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nsIURI *aContentLocation,
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nsIURI *aRequestingLocation,
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nsISupports *aRequestingContext,
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const nsACString &aMimeGuess,
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nsISupports *aExtra,
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PRInt16 *aDecision)
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|
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{
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// For loads where aRequestingContext is chrome, we should just
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// accept. Those are most likely toplevel loads in windows, and
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// chrome generally knows what it's doing anyway.
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nsCOMPtr<nsIDocShellTreeItem> item =
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do_QueryInterface(NS_CP_GetDocShellFromContext(aRequestingContext));
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if (item) {
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PRInt32 type;
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item->GetItemType(&type);
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if (type == nsIDocShellTreeItem::typeChrome) {
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*aDecision = nsIContentPolicy::ACCEPT;
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return NS_OK;
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}
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}
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// This isn't a load from chrome. Just do a ShouldLoad() check --
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|
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// we want the same answer here
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return ShouldLoad(aContentType, aContentLocation, aRequestingLocation,
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aRequestingContext, aMimeGuess, aExtra, aDecision);
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}
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nsresult
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nsContentBlocker::TestPermission(nsIURI *aCurrentURI,
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nsIURI *aFirstURI,
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PRInt32 aContentType,
|
2011-09-29 10:19:26 +04:00
|
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bool *aPermission,
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|
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bool *aFromPrefs)
|
2004-11-08 18:37:32 +03:00
|
|
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{
|
2011-10-17 18:59:28 +04:00
|
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*aFromPrefs = false;
|
2004-11-08 18:37:32 +03:00
|
|
|
// This default will also get used if there is an unknown value in the
|
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|
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// permission list, or if the permission manager returns unknown values.
|
2011-10-17 18:59:28 +04:00
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*aPermission = true;
|
2004-11-08 18:37:32 +03:00
|
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|
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|
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// check the permission list first; if we find an entry, it overrides
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|
|
|
// default prefs.
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|
|
// Don't forget the aContentType ranges from 1..8, while the
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|
|
|
// array is indexed 0..7
|
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|
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PRUint32 permission;
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|
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nsresult rv = mPermissionManager->TestPermission(aCurrentURI,
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|
|
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kTypeString[aContentType - 1],
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|
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&permission);
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NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
|
|
|
|
// If there is nothing on the list, use the default.
|
2004-12-15 21:31:23 +03:00
|
|
|
if (!permission) {
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|
|
|
permission = mBehaviorPref[aContentType - 1];
|
2011-10-17 18:59:28 +04:00
|
|
|
*aFromPrefs = true;
|
2004-12-15 21:31:23 +03:00
|
|
|
}
|
|
|
|
|
2004-11-08 18:37:32 +03:00
|
|
|
// Use the fact that the nsIPermissionManager values map to
|
|
|
|
// the BEHAVIOR_* values above.
|
|
|
|
switch (permission) {
|
|
|
|
case BEHAVIOR_ACCEPT:
|
2011-10-17 18:59:28 +04:00
|
|
|
*aPermission = true;
|
2004-11-08 18:37:32 +03:00
|
|
|
break;
|
|
|
|
case BEHAVIOR_REJECT:
|
2011-10-17 18:59:28 +04:00
|
|
|
*aPermission = false;
|
2004-11-08 18:37:32 +03:00
|
|
|
break;
|
|
|
|
|
|
|
|
case BEHAVIOR_NOFOREIGN:
|
|
|
|
// Third party checking
|
|
|
|
|
2005-01-25 21:31:02 +03:00
|
|
|
// Need a requesting uri for third party checks to work.
|
|
|
|
if (!aFirstURI)
|
|
|
|
return NS_OK;
|
|
|
|
|
2011-09-29 10:19:26 +04:00
|
|
|
bool trustedSource = false;
|
2005-01-25 21:31:02 +03:00
|
|
|
rv = aFirstURI->SchemeIs("chrome", &trustedSource);
|
|
|
|
NS_ENSURE_SUCCESS(rv,rv);
|
|
|
|
if (!trustedSource) {
|
|
|
|
rv = aFirstURI->SchemeIs("resource", &trustedSource);
|
|
|
|
NS_ENSURE_SUCCESS(rv,rv);
|
|
|
|
}
|
|
|
|
if (trustedSource)
|
|
|
|
return NS_OK;
|
|
|
|
|
2004-11-08 18:37:32 +03:00
|
|
|
// compare tails of names checking to see if they have a common domain
|
|
|
|
// we do this by comparing the tails of both names where each tail
|
|
|
|
// includes at least one dot
|
|
|
|
|
|
|
|
// A more generic method somewhere would be nice
|
|
|
|
|
|
|
|
nsCAutoString currentHost;
|
|
|
|
rv = aCurrentURI->GetAsciiHost(currentHost);
|
|
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
|
|
|
|
// Search for two dots, starting at the end.
|
|
|
|
// If there are no two dots found, ++dot will turn to zero,
|
|
|
|
// that will return the entire string.
|
|
|
|
PRInt32 dot = currentHost.RFindChar('.');
|
|
|
|
dot = currentHost.RFindChar('.', dot-1);
|
|
|
|
++dot;
|
|
|
|
|
|
|
|
// Get the domain, ie the last part of the host (www.domain.com -> domain.com)
|
|
|
|
// This will break on co.uk
|
|
|
|
const nsCSubstring &tail =
|
|
|
|
Substring(currentHost, dot, currentHost.Length() - dot);
|
|
|
|
|
|
|
|
nsCAutoString firstHost;
|
|
|
|
rv = aFirstURI->GetAsciiHost(firstHost);
|
|
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
|
|
|
|
// If the tail is longer then the whole firstHost, it will never match
|
|
|
|
if (firstHost.Length() < tail.Length()) {
|
2011-10-17 18:59:28 +04:00
|
|
|
*aPermission = false;
|
2004-11-08 18:37:32 +03:00
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Get the last part of the firstUri with the same length as |tail|
|
|
|
|
const nsCSubstring &firstTail =
|
|
|
|
Substring(firstHost, firstHost.Length() - tail.Length(), tail.Length());
|
|
|
|
|
|
|
|
// Check that both tails are the same, and that just before the tail in
|
|
|
|
// |firstUri| there is a dot. That means both url are in the same domain
|
|
|
|
if ((firstHost.Length() > tail.Length() &&
|
|
|
|
firstHost.CharAt(firstHost.Length() - tail.Length() - 1) != '.') ||
|
|
|
|
!tail.Equals(firstTail)) {
|
2011-10-17 18:59:28 +04:00
|
|
|
*aPermission = false;
|
2004-11-08 18:37:32 +03:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return NS_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
NS_IMETHODIMP
|
|
|
|
nsContentBlocker::Observe(nsISupports *aSubject,
|
|
|
|
const char *aTopic,
|
|
|
|
const PRUnichar *aData)
|
|
|
|
{
|
|
|
|
NS_ASSERTION(!strcmp(NS_PREFBRANCH_PREFCHANGE_TOPIC_ID, aTopic),
|
|
|
|
"unexpected topic - we only deal with pref changes!");
|
|
|
|
|
|
|
|
if (mPrefBranchInternal)
|
|
|
|
PrefChanged(mPrefBranchInternal, NS_LossyConvertUTF16toASCII(aData).get());
|
|
|
|
return NS_OK;
|
|
|
|
}
|