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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "plugin/cross/whitelist.h"
#include <string>
#include "base/basictypes.h"
#include "base/logging.h"
namespace o3d {
#if !defined(O3D_PLUGIN_DOMAIN_WHITELIST) && \
!defined(O3D_PLUGIN_ENABLE_FULLSCREEN_MSG)
#error "No whitelist and no fullscreen message is a security vulnerability"
#endif
#ifdef O3D_PLUGIN_DOMAIN_WHITELIST
static const char *const kDomainWhitelist[] = {
// This macro contains the comma-separated string literals for the whitelist
O3D_PLUGIN_DOMAIN_WHITELIST
};
static const char kHttpProtocol[] = "http://";
static const char kHttpsProtocol[] = "https://";
// For testing purposes assume local files valid too.
static const char kLocalFileUrlProtocol[] = "file://";
static std::string GetURL(NPP instance) {
// get URL for the loading page - first approach from
// http://developer.mozilla.org/en/docs/Getting_the_page_URL_in_NPAPI_plugin
// Get the window object.
// note: on some browsers, this will increment the window ref count.
// on others, it won't.
// this is a bug in.... something, but no one agrees what.
// http://lists.apple.com/archives/webkitsdk-dev/2005/Aug/msg00044.html
NPObject *window_obj = NULL;
NPError err = NPN_GetValue(instance, NPNVWindowNPObject,
&window_obj);
if (NPERR_NO_ERROR != err) {
LOG(ERROR) << "getvalue failed (err = " << err << ")";
return "";
}
// Create a "location" identifier.
NPIdentifier identifier = NPN_GetStringIdentifier("location");
// Declare a local variant value.
NPVariant variant_value;
// Get the location property from the window object
// (which is another object).
bool success = NPN_GetProperty(instance, window_obj, identifier,
&variant_value);
if (!success) {
LOG(ERROR) << "getproperty failed";
return "";
}
// Get a pointer to the "location" object.
NPObject *location_obj = variant_value.value.objectValue;
// Create a "href" identifier.
identifier = NPN_GetStringIdentifier("href");
// Get the location property from the location object.
success = NPN_GetProperty(instance, location_obj, identifier,
&variant_value);
if (!success) {
LOG(ERROR) << "getproperty failed";
return "";
}
// let's just grab the NPUTF8 from the variant and make a std::string
// from it.
std::string url(static_cast<const char *>(
variant_value.value.stringValue.UTF8Characters),
static_cast<size_t>(
variant_value.value.stringValue.UTF8Length));
NPN_ReleaseVariantValue(&variant_value);
return url;
}
static std::string ParseUrlHost(const std::string &in_url) {
size_t host_start;
if (in_url.find(kHttpProtocol) == 0) {
host_start = sizeof(kHttpProtocol) - 1;
} else if (in_url.find(kHttpsProtocol) == 0) {
host_start = sizeof(kHttpsProtocol) - 1;
} else {
// Do not allow usage on non http/https pages.
return "";
}
size_t path_start = in_url.find("/", host_start);
if (path_start == std::string::npos) {
path_start = in_url.size();
}
const std::string host_and_port(
in_url.substr(host_start, path_start - host_start));
size_t colon_pos = host_and_port.find(":");
if (colon_pos == std::string::npos) {
colon_pos = host_and_port.size();
}
return host_and_port.substr(0, colon_pos);
}
static bool IsDomainWhitelisted(const std::string &in_url) {
if (in_url.find(kLocalFileUrlProtocol) == 0) {
// Starts with file://, so it's a local file. Allow access for testing
// purposes.
return true;
} else {
std::string host(ParseUrlHost(in_url));
// convert the host to a lower-cased version so we
// don't have to worry about case mismatches.
for (size_t i = 0; i < host.length(); ++i) {
host[i] = tolower(host[i]);
}
for (size_t i = 0; i < arraysize(kDomainWhitelist); ++i) {
size_t pos = host.rfind(kDomainWhitelist[i]);
if (pos != std::string::npos &&
((pos + strlen(kDomainWhitelist[i]) == host.length())))
return true;
}
return false;
}
}
#endif // O3D_PLUGIN_DOMAIN_WHITELIST
bool IsDomainAuthorized(NPP instance) {
#ifdef O3D_PLUGIN_DOMAIN_WHITELIST
return IsDomainWhitelisted(GetURL(instance));
#else
// No whitelist; allow usage on any website. (This is the default.)
return true;
#endif
}
} // namespace o3d
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