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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/scripting_permissions_modifier.h"
#include "chrome/browser/extensions/extension_util.h"
#include "chrome/browser/extensions/permissions_updater.h"
#include "extensions/browser/extension_prefs.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/extension.h"
#include "extensions/common/feature_switch.h"
#include "extensions/common/manifest_handlers/permissions_parser.h"
#include "extensions/common/permissions/permission_set.h"
#include "extensions/common/permissions/permissions_data.h"
#include "extensions/common/user_script.h"
namespace extensions {
namespace {
URLPatternSet FilterImpliedAllHostsPatterns(const URLPatternSet& patterns) {
URLPatternSet result;
for (const URLPattern& pattern : patterns) {
if (pattern.ImpliesAllHosts())
result.AddPattern(pattern);
}
return result;
}
} // namespace
ScriptingPermissionsModifier::ScriptingPermissionsModifier(
content::BrowserContext* browser_context,
const scoped_refptr<const Extension>& extension)
: browser_context_(browser_context), extension_(extension) {}
ScriptingPermissionsModifier::~ScriptingPermissionsModifier() {}
bool ScriptingPermissionsModifier::CanAffectExtension(
const PermissionSet& permissions) const {
// An extension may require user action to execute scripts iff the extension
// shows up in chrome:extensions (so the user can grant withheld permissions),
// is not part of chrome or corporate policy, not on the scripting whitelist,
// and requires enough permissions that we should withhold them.
return extension_->ShouldDisplayInExtensionSettings() &&
!Manifest::IsPolicyLocation(extension_->location()) &&
!Manifest::IsComponentLocation(extension_->location()) &&
!PermissionsData::CanExecuteScriptEverywhere(extension_.get()) &&
permissions.ShouldWarnAllHosts();
}
bool ScriptingPermissionsModifier::HasAffectedExtension() const {
return extension_->permissions_data()->HasWithheldImpliedAllHosts() ||
util::HasSetAllowedScriptingOnAllUrls(extension_->id(),
browser_context_);
}
void ScriptingPermissionsModifier::GrantHostPermission(const GURL& url) const {
GURL origin = url.GetOrigin();
URLPatternSet new_explicit_hosts;
URLPatternSet new_scriptable_hosts;
const PermissionSet& withheld_permissions =
extension_->permissions_data()->withheld_permissions();
if (withheld_permissions.explicit_hosts().MatchesURL(url)) {
new_explicit_hosts.AddOrigin(UserScript::ValidUserScriptSchemes(), origin);
}
if (withheld_permissions.scriptable_hosts().MatchesURL(url)) {
new_scriptable_hosts.AddOrigin(UserScript::ValidUserScriptSchemes(),
origin);
}
PermissionsUpdater(browser_context_)
.AddPermissions(extension_.get(),
PermissionSet(APIPermissionSet(), ManifestPermissionSet(),
new_explicit_hosts, new_scriptable_hosts));
}
bool ScriptingPermissionsModifier::HasGrantedHostPermission(
const GURL& url) const {
GURL origin = url.GetOrigin();
const PermissionSet& required_permissions =
PermissionsParser::GetRequiredPermissions(extension_.get());
if (!extension_->permissions_data()
->active_permissions()
.effective_hosts()
.MatchesURL(origin))
return false;
scoped_ptr<const PermissionSet> granted_permissions;
scoped_ptr<const PermissionSet> withheld_permissions;
WithholdPermissions(required_permissions, &granted_permissions,
&withheld_permissions, true);
if (!granted_permissions->effective_hosts().MatchesURL(origin) &&
withheld_permissions->effective_hosts().MatchesURL(origin))
return true;
return false;
}
void ScriptingPermissionsModifier::RemoveGrantedHostPermission(
const GURL& url) const {
DCHECK(HasGrantedHostPermission(url));
GURL origin = url.GetOrigin();
URLPatternSet explicit_hosts;
URLPatternSet scriptable_hosts;
const PermissionSet& active_permissions =
extension_->permissions_data()->active_permissions();
if (active_permissions.explicit_hosts().MatchesURL(url))
explicit_hosts.AddOrigin(UserScript::ValidUserScriptSchemes(), origin);
if (active_permissions.scriptable_hosts().MatchesURL(url))
scriptable_hosts.AddOrigin(UserScript::ValidUserScriptSchemes(), origin);
PermissionsUpdater(browser_context_)
.RemovePermissions(
extension_.get(),
PermissionSet(APIPermissionSet(), ManifestPermissionSet(),
explicit_hosts, scriptable_hosts),
PermissionsUpdater::REMOVE_HARD);
}
void ScriptingPermissionsModifier::WithholdPermissions(
const PermissionSet& permissions,
scoped_ptr<const PermissionSet>* granted_permissions_out,
scoped_ptr<const PermissionSet>* withheld_permissions_out,
bool use_initial_state) const {
bool should_withhold = false;
if (CanAffectExtension(permissions)) {
if (use_initial_state) {
// If the user ever set the extension's "all-urls" preference, then the
// initial state was withheld. This is important, since the all-urls
// permission should be shown as revokable. Otherwise, default to whatever
// the system setting is.
should_withhold =
util::HasSetAllowedScriptingOnAllUrls(extension_->id(),
browser_context_) ||
!util::DefaultAllowedScriptingOnAllUrls();
} else {
should_withhold =
!util::AllowedScriptingOnAllUrls(extension_->id(), browser_context_);
}
}
if (!should_withhold) {
*granted_permissions_out = permissions.Clone();
withheld_permissions_out->reset(new PermissionSet());
return;
}
auto segregate_url_permissions = [](const URLPatternSet& patterns,
URLPatternSet* granted,
URLPatternSet* withheld) {
for (const URLPattern& pattern : patterns) {
if (pattern.ImpliesAllHosts())
withheld->AddPattern(pattern);
else
granted->AddPattern(pattern);
}
};
URLPatternSet granted_explicit_hosts;
URLPatternSet withheld_explicit_hosts;
URLPatternSet granted_scriptable_hosts;
URLPatternSet withheld_scriptable_hosts;
segregate_url_permissions(permissions.explicit_hosts(),
&granted_explicit_hosts, &withheld_explicit_hosts);
segregate_url_permissions(permissions.scriptable_hosts(),
&granted_scriptable_hosts,
&withheld_scriptable_hosts);
granted_permissions_out->reset(
new PermissionSet(permissions.apis(), permissions.manifest_permissions(),
granted_explicit_hosts, granted_scriptable_hosts));
withheld_permissions_out->reset(
new PermissionSet(APIPermissionSet(), ManifestPermissionSet(),
withheld_explicit_hosts, withheld_scriptable_hosts));
}
void ScriptingPermissionsModifier::GrantWithheldImpliedAllHosts() const {
const PermissionSet& withheld =
extension_->permissions_data()->withheld_permissions();
PermissionSet permissions(
APIPermissionSet(), ManifestPermissionSet(),
FilterImpliedAllHostsPatterns(withheld.explicit_hosts()),
FilterImpliedAllHostsPatterns(withheld.scriptable_hosts()));
PermissionsUpdater(browser_context_)
.AddPermissions(extension_.get(), permissions);
}
void ScriptingPermissionsModifier::WithholdImpliedAllHosts() const {
const PermissionSet& active =
extension_->permissions_data()->active_permissions();
PermissionSet permissions(
APIPermissionSet(), ManifestPermissionSet(),
FilterImpliedAllHostsPatterns(active.explicit_hosts()),
FilterImpliedAllHostsPatterns(active.scriptable_hosts()));
PermissionsUpdater(browser_context_)
.RemovePermissions(extension_.get(), permissions,
PermissionsUpdater::REMOVE_HARD);
}
} // namespace extensions
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