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/*
* Copyright (C) 2011 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY GOOGLE, INC. ``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 APPLE INC. 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 "config.h"
#include "SecurityContext.h"
#include "ContentSecurityPolicy.h"
#include "PolicyContainer.h"
#include "SecurityOrigin.h"
#include "SecurityOriginPolicy.h"
#include <wtf/text/StringBuilder.h>
namespace WebCore {
SecurityContext::SecurityContext() = default;
SecurityContext::~SecurityContext() = default;
void SecurityContext::setSecurityOriginPolicy(RefPtr<SecurityOriginPolicy>&& securityOriginPolicy)
{
m_securityOriginPolicy = WTFMove(securityOriginPolicy);
m_haveInitializedSecurityOrigin = true;
}
SecurityOrigin* SecurityContext::securityOrigin() const
{
if (!m_securityOriginPolicy)
return nullptr;
return &m_securityOriginPolicy->origin();
}
void SecurityContext::setContentSecurityPolicy(std::unique_ptr<ContentSecurityPolicy>&& contentSecurityPolicy)
{
m_contentSecurityPolicy = WTFMove(contentSecurityPolicy);
}
bool SecurityContext::isSecureTransitionTo(const URL& url) const
{
// If we haven't initialized our security origin by now, this is probably
// a new window created via the API (i.e., that lacks an origin and lacks
// a place to inherit the origin from).
if (!haveInitializedSecurityOrigin())
return true;
return securityOriginPolicy()->origin().isSameOriginDomain(SecurityOrigin::create(url).get());
}
void SecurityContext::enforceSandboxFlags(SandboxFlags mask, SandboxFlagsSource source)
{
if (source != SandboxFlagsSource::CSP)
m_creationSandboxFlags |= mask;
m_sandboxFlags |= mask;
// The SandboxOrigin is stored redundantly in the security origin.
if (isSandboxed(SandboxOrigin) && securityOriginPolicy() && !securityOriginPolicy()->origin().isOpaque())
setSecurityOriginPolicy(SecurityOriginPolicy::create(SecurityOrigin::createOpaque()));
}
bool SecurityContext::isSupportedSandboxPolicy(StringView policy)
{
static constexpr ASCIILiteral supportedPolicies[] = {
"allow-top-navigation-to-custom-protocols"_s, "allow-forms"_s, "allow-same-origin"_s, "allow-scripts"_s,
"allow-top-navigation"_s, "allow-pointer-lock"_s, "allow-popups"_s, "allow-popups-to-escape-sandbox"_s,
"allow-top-navigation-by-user-activation"_s, "allow-modals"_s, "allow-storage-access-by-user-activation"_s,
"allow-downloads"_s
};
for (auto supportedPolicy : supportedPolicies) {
if (equalIgnoringASCIICase(policy, supportedPolicy))
return true;
}
return false;
}
// Keep SecurityContext::isSupportedSandboxPolicy() in sync when updating this function.
SandboxFlags SecurityContext::parseSandboxPolicy(StringView policy, String& invalidTokensErrorMessage)
{
// http://www.w3.org/TR/html5/the-iframe-element.html#attr-iframe-sandbox
// Parse the unordered set of unique space-separated tokens.
SandboxFlags flags = SandboxAll;
unsigned length = policy.length();
unsigned start = 0;
unsigned numberOfTokenErrors = 0;
StringBuilder tokenErrors;
while (true) {
while (start < length && isASCIIWhitespace(policy[start]))
++start;
if (start >= length)
break;
unsigned end = start + 1;
while (end < length && !isASCIIWhitespace(policy[end]))
++end;
// Turn off the corresponding sandbox flag if it's set as "allowed".
auto sandboxToken = policy.substring(start, end - start);
if (equalLettersIgnoringASCIICase(sandboxToken, "allow-same-origin"_s))
flags &= ~SandboxOrigin;
else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-downloads"_s))
flags &= ~SandboxDownloads;
else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-forms"_s))
flags &= ~SandboxForms;
else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-scripts"_s)) {
flags &= ~SandboxScripts;
flags &= ~SandboxAutomaticFeatures;
} else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-top-navigation"_s)) {
flags &= ~SandboxTopNavigation;
flags &= ~SandboxTopNavigationByUserActivation;
} else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-popups"_s))
flags &= ~SandboxPopups;
else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-pointer-lock"_s))
flags &= ~SandboxPointerLock;
else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-popups-to-escape-sandbox"_s))
flags &= ~SandboxPropagatesToAuxiliaryBrowsingContexts;
else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-top-navigation-by-user-activation"_s))
flags &= ~SandboxTopNavigationByUserActivation;
else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-top-navigation-to-custom-protocols"_s))
flags &= ~SandboxTopNavigationToCustomProtocols;
else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-modals"_s))
flags &= ~SandboxModals;
else if (equalLettersIgnoringASCIICase(sandboxToken, "allow-storage-access-by-user-activation"_s))
flags &= ~SandboxStorageAccessByUserActivation;
else {
if (numberOfTokenErrors)
tokenErrors.append(", '");
else
tokenErrors.append('\'');
tokenErrors.append(sandboxToken, '\'');
numberOfTokenErrors++;
}
start = end + 1;
}
if (numberOfTokenErrors) {
if (numberOfTokenErrors > 1)
tokenErrors.append(" are invalid sandbox flags.");
else
tokenErrors.append(" is an invalid sandbox flag.");
invalidTokensErrorMessage = tokenErrors.toString();
}
return flags;
}
void SecurityContext::setReferrerPolicy(ReferrerPolicy referrerPolicy)
{
// Do not override existing referrer policy with the "empty string" one as the "empty string" means we should use
// the policy defined elsewhere.
if (referrerPolicy == ReferrerPolicy::EmptyString)
return;
m_referrerPolicy = referrerPolicy;
}
PolicyContainer SecurityContext::policyContainer() const
{
ASSERT(m_contentSecurityPolicy);
return {
m_contentSecurityPolicy->responseHeaders(),
crossOriginEmbedderPolicy(),
crossOriginOpenerPolicy(),
referrerPolicy()
};
}
void SecurityContext::inheritPolicyContainerFrom(const PolicyContainer& policyContainer)
{
if (!contentSecurityPolicy())
setContentSecurityPolicy(makeUnique<ContentSecurityPolicy>(URL { }, nullptr, nullptr));
contentSecurityPolicy()->inheritHeadersFrom(policyContainer.contentSecurityPolicyResponseHeaders);
setCrossOriginOpenerPolicy(policyContainer.crossOriginOpenerPolicy);
setCrossOriginEmbedderPolicy(policyContainer.crossOriginEmbedderPolicy);
setReferrerPolicy(policyContainer.referrerPolicy);
}
}
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