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Mypal/dom/security/nsCSPContext.cpp

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basic source
2019-03-11 10:26:37 +00:00
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsCOMPtr.h"
#include "nsContentPolicyUtils.h"
#include "nsContentUtils.h"
#include "nsCSPContext.h"
#include "nsCSPParser.h"
#include "nsCSPService.h"
#include "nsError.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsIClassInfoImpl.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDOMNode.h"
#include "nsIHttpChannel.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsIStringStream.h"
#include "nsIUploadChannel.h"
#include "nsIScriptError.h"
#include "nsIWebNavigation.h"
#include "nsMimeTypes.h"
#include "nsNetUtil.h"
#include "nsIContentPolicy.h"
#include "nsSupportsPrimitives.h"
#include "nsThreadUtils.h"
#include "nsString.h"
#include "nsScriptSecurityManager.h"
#include "nsStringStream.h"
#include "mozilla/Logging.h"
#include "mozilla/dom/CSPReportBinding.h"
#include "mozilla/dom/CSPDictionariesBinding.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "nsINetworkInterceptController.h"
#include "nsSandboxFlags.h"
#include "nsIScriptElement.h"
using namespace mozilla;
static LogModule*
GetCspContextLog()
{
static LazyLogModule gCspContextPRLog("CSPContext");
return gCspContextPRLog;
}
#define CSPCONTEXTLOG(args) MOZ_LOG(GetCspContextLog(), mozilla::LogLevel::Debug, args)
#define CSPCONTEXTLOGENABLED() MOZ_LOG_TEST(GetCspContextLog(), mozilla::LogLevel::Debug)
static const uint32_t CSP_CACHE_URI_CUTOFF_SIZE = 512;
/**
* Creates a key for use in the ShouldLoad cache.
* Looks like: <uri>!<nsIContentPolicy::LOAD_TYPE>
*/
nsresult
CreateCacheKey_Internal(nsIURI* aContentLocation,
nsContentPolicyType aContentType,
nsACString& outCacheKey)
{
if (!aContentLocation) {
return NS_ERROR_FAILURE;
}
bool isDataScheme = false;
nsresult rv = aContentLocation->SchemeIs("data", &isDataScheme);
NS_ENSURE_SUCCESS(rv, rv);
outCacheKey.Truncate();
if (aContentType != nsIContentPolicy::TYPE_SCRIPT && isDataScheme) {
// For non-script data: URI, use ("data:", aContentType) as the cache key.
outCacheKey.Append(NS_LITERAL_CSTRING("data:"));
outCacheKey.AppendInt(aContentType);
return NS_OK;
}
nsAutoCString spec;
rv = aContentLocation->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
// Don't cache for a URI longer than the cutoff size.
if (spec.Length() <= CSP_CACHE_URI_CUTOFF_SIZE) {
outCacheKey.Append(spec);
outCacheKey.Append(NS_LITERAL_CSTRING("!"));
outCacheKey.AppendInt(aContentType);
}
return NS_OK;
}
/* ===== nsIContentSecurityPolicy impl ====== */
NS_IMETHODIMP
nsCSPContext::ShouldLoad(nsContentPolicyType aContentType,
nsIURI* aContentLocation,
nsIURI* aRequestOrigin,
nsISupports* aRequestContext,
const nsACString& aMimeTypeGuess,
nsISupports* aExtra,
int16_t* outDecision)
{
if (CSPCONTEXTLOGENABLED()) {
CSPCONTEXTLOG(("nsCSPContext::ShouldLoad, aContentLocation: %s",
aContentLocation->GetSpecOrDefault().get()));
CSPCONTEXTLOG((">>>> aContentType: %d", aContentType));
}
bool isPreload = nsContentUtils::IsPreloadType(aContentType);
// Since we know whether we are dealing with a preload, we have to convert
// the internal policytype ot the external policy type before moving on.
// We still need to know if this is a worker so child-src can handle that
// case correctly.
aContentType = nsContentUtils::InternalContentPolicyTypeToExternalOrWorker(aContentType);
nsresult rv = NS_OK;
// This ShouldLoad function is called from nsCSPService::ShouldLoad,
// which already checked a number of things, including:
// * aContentLocation is not null; we can consume this without further checks
// * scheme is not a whitelisted scheme (about: chrome:, etc).
// * CSP is enabled
// * Content Type is not whitelisted (CSP Reports, TYPE_DOCUMENT, etc).
// * Fast Path for Apps
nsAutoCString cacheKey;
rv = CreateCacheKey_Internal(aContentLocation, aContentType, cacheKey);
NS_ENSURE_SUCCESS(rv, rv);
bool isCached = mShouldLoadCache.Get(cacheKey, outDecision);
if (isCached && cacheKey.Length() > 0) {
// this is cached, use the cached value.
return NS_OK;
}
// Default decision, CSP can revise it if there's a policy to enforce
*outDecision = nsIContentPolicy::ACCEPT;
// If the content type doesn't map to a CSP directive, there's nothing for
// CSP to do.
CSPDirective dir = CSP_ContentTypeToDirective(aContentType);
if (dir == nsIContentSecurityPolicy::NO_DIRECTIVE) {
return NS_OK;
}
nsAutoString nonce;
bool parserCreated = false;
if (!isPreload) {
if (aContentType == nsIContentPolicy::TYPE_SCRIPT ||
aContentType == nsIContentPolicy::TYPE_STYLESHEET) {
nsCOMPtr<nsIDOMHTMLElement> htmlElement = do_QueryInterface(aRequestContext);
if (htmlElement) {
rv = htmlElement->GetAttribute(NS_LITERAL_STRING("nonce"), nonce);
NS_ENSURE_SUCCESS(rv, rv);
}
}
nsCOMPtr<nsIScriptElement> script = do_QueryInterface(aRequestContext);
if (script && script->GetParserCreated() != mozilla::dom::NOT_FROM_PARSER) {
parserCreated = true;
}
}
// aExtra holds the original URI of the channel if the
// channel got redirected (until we fix Bug 1332422).
nsCOMPtr<nsIURI> originalURI = do_QueryInterface(aExtra);
bool wasRedirected = originalURI;
bool permitted = permitsInternal(dir,
aContentLocation,
originalURI,
nonce,
wasRedirected,
isPreload,
false, // allow fallback to default-src
true, // send violation reports
true, // send blocked URI in violation reports
parserCreated);
*outDecision = permitted ? nsIContentPolicy::ACCEPT
: nsIContentPolicy::REJECT_SERVER;
// Done looping, cache any relevant result
if (cacheKey.Length() > 0 && !isPreload) {
mShouldLoadCache.Put(cacheKey, *outDecision);
}
if (CSPCONTEXTLOGENABLED()) {
CSPCONTEXTLOG(("nsCSPContext::ShouldLoad, decision: %s, "
"aContentLocation: %s",
*outDecision > 0 ? "load" : "deny",
aContentLocation->GetSpecOrDefault().get()));
}
return NS_OK;
}
bool
nsCSPContext::permitsInternal(CSPDirective aDir,
nsIURI* aContentLocation,
nsIURI* aOriginalURI,
const nsAString& aNonce,
bool aWasRedirected,
bool aIsPreload,
bool aSpecific,
bool aSendViolationReports,
bool aSendContentLocationInViolationReports,
bool aParserCreated)
{
bool permits = true;
nsAutoString violatedDirective;
for (uint32_t p = 0; p < mPolicies.Length(); p++) {
if (!mPolicies[p]->permits(aDir,
aContentLocation,
aNonce,
aWasRedirected,
aSpecific,
aParserCreated,
violatedDirective)) {
// If the policy is violated and not report-only, reject the load and
// report to the console
if (!mPolicies[p]->getReportOnlyFlag()) {
CSPCONTEXTLOG(("nsCSPContext::permitsInternal, false"));
permits = false;
}
// Do not send a report or notify observers if this is a preload - the
// decision may be wrong due to the inability to get the nonce, and will
// incorrectly fail the unit tests.
if (!aIsPreload && aSendViolationReports) {
this->AsyncReportViolation((aSendContentLocationInViolationReports ?
aContentLocation : nullptr),
aOriginalURI, /* in case of redirect originalURI is not null */
violatedDirective,
p, /* policy index */
EmptyString(), /* no observer subject */
EmptyString(), /* no source file */
EmptyString(), /* no script sample */
0); /* no line number */
}
}
}
return permits;
}
/* ===== nsISupports implementation ========== */
NS_IMPL_CLASSINFO(nsCSPContext,
nullptr,
nsIClassInfo::MAIN_THREAD_ONLY,
NS_CSPCONTEXT_CID)
NS_IMPL_ISUPPORTS_CI(nsCSPContext,
nsIContentSecurityPolicy,
nsISerializable)
nsCSPContext::nsCSPContext()
: mInnerWindowID(0)
, mLoadingContext(nullptr)
, mLoadingPrincipal(nullptr)
, mQueueUpMessages(true)
{
CSPCONTEXTLOG(("nsCSPContext::nsCSPContext"));
}
nsCSPContext::~nsCSPContext()
{
CSPCONTEXTLOG(("nsCSPContext::~nsCSPContext"));
for (uint32_t i = 0; i < mPolicies.Length(); i++) {
delete mPolicies[i];
}
mShouldLoadCache.Clear();
}
NS_IMETHODIMP
nsCSPContext::GetPolicyString(uint32_t aIndex, nsAString& outStr)
{
if (aIndex >= mPolicies.Length()) {
return NS_ERROR_ILLEGAL_VALUE;
}
mPolicies[aIndex]->toString(outStr);
return NS_OK;
}
const nsCSPPolicy*
nsCSPContext::GetPolicy(uint32_t aIndex)
{
if (aIndex >= mPolicies.Length()) {
return nullptr;
}
return mPolicies[aIndex];
}
NS_IMETHODIMP
nsCSPContext::GetPolicyCount(uint32_t *outPolicyCount)
{
*outPolicyCount = mPolicies.Length();
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::GetUpgradeInsecureRequests(bool *outUpgradeRequest)
{
*outUpgradeRequest = false;
for (uint32_t i = 0; i < mPolicies.Length(); i++) {
if (mPolicies[i]->hasDirective(nsIContentSecurityPolicy::UPGRADE_IF_INSECURE_DIRECTIVE)) {
*outUpgradeRequest = true;
return NS_OK;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::GetBlockAllMixedContent(bool *outBlockAllMixedContent)
{
*outBlockAllMixedContent = false;
for (uint32_t i = 0; i < mPolicies.Length(); i++) {
if (!mPolicies[i]->getReportOnlyFlag() &&
mPolicies[i]->hasDirective(nsIContentSecurityPolicy::BLOCK_ALL_MIXED_CONTENT)) {
*outBlockAllMixedContent = true;
return NS_OK;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::GetEnforcesFrameAncestors(bool *outEnforcesFrameAncestors)
{
*outEnforcesFrameAncestors = false;
for (uint32_t i = 0; i < mPolicies.Length(); i++) {
if (!mPolicies[i]->getReportOnlyFlag() &&
mPolicies[i]->hasDirective(nsIContentSecurityPolicy::FRAME_ANCESTORS_DIRECTIVE)) {
*outEnforcesFrameAncestors = true;
return NS_OK;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::GetReferrerPolicy(uint32_t* outPolicy, bool* outIsSet)
{
*outIsSet = false;
*outPolicy = mozilla::net::RP_Default;
nsAutoString refpol;
mozilla::net::ReferrerPolicy previousPolicy = mozilla::net::RP_Default;
for (uint32_t i = 0; i < mPolicies.Length(); i++) {
mPolicies[i]->getReferrerPolicy(refpol);
// only set the referrer policy if not delievered through a CSPRO and
// note that and an empty string in refpol means it wasn't set
// (that's the default in nsCSPPolicy).
if (!mPolicies[i]->getReportOnlyFlag() && !refpol.IsEmpty()) {
// Referrer Directive in CSP is no more used and going to be replaced by
// Referrer-Policy HTTP header. But we still keep using referrer directive,
// and would remove it later.
// Referrer Directive specs is not fully compliant with new referrer policy
// specs. What we are using here:
// - If the value of the referrer directive is invalid, the user agent
// should set the referrer policy to no-referrer.
// - If there are two policies that specify a referrer policy, then they
// must agree or the employed policy is no-referrer.
if (!mozilla::net::IsValidReferrerPolicy(refpol)) {
*outPolicy = mozilla::net::RP_No_Referrer;
*outIsSet = true;
return NS_OK;
}
uint32_t currentPolicy = mozilla::net::ReferrerPolicyFromString(refpol);
if (*outIsSet && previousPolicy != currentPolicy) {
*outPolicy = mozilla::net::RP_No_Referrer;
return NS_OK;
}
*outPolicy = currentPolicy;
*outIsSet = true;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::AppendPolicy(const nsAString& aPolicyString,
bool aReportOnly,
bool aDeliveredViaMetaTag)
{
CSPCONTEXTLOG(("nsCSPContext::AppendPolicy: %s",
NS_ConvertUTF16toUTF8(aPolicyString).get()));
// Use the mSelfURI from setRequestContext, see bug 991474
NS_ASSERTION(mSelfURI, "mSelfURI required for AppendPolicy, but not set");
nsCSPPolicy* policy = nsCSPParser::parseContentSecurityPolicy(aPolicyString, mSelfURI,
aReportOnly, this,
aDeliveredViaMetaTag);
if (policy) {
mPolicies.AppendElement(policy);
// reset cache since effective policy changes
mShouldLoadCache.Clear();
}
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::GetAllowsEval(bool* outShouldReportViolation,
bool* outAllowsEval)
{
*outShouldReportViolation = false;
*outAllowsEval = true;
for (uint32_t i = 0; i < mPolicies.Length(); i++) {
if (!mPolicies[i]->allows(nsIContentPolicy::TYPE_SCRIPT,
CSP_UNSAFE_EVAL,
EmptyString(),
false)) {
// policy is violated: must report the violation and allow the inline
// script if the policy is report-only.
*outShouldReportViolation = true;
if (!mPolicies[i]->getReportOnlyFlag()) {
*outAllowsEval = false;
}
}
}
return NS_OK;
}
// Helper function to report inline violations
void
nsCSPContext::reportInlineViolation(nsContentPolicyType aContentType,
const nsAString& aNonce,
const nsAString& aContent,
const nsAString& aViolatedDirective,
uint32_t aViolatedPolicyIndex, // TODO, use report only flag for that
uint32_t aLineNumber)
{
nsString observerSubject;
// if the nonce is non empty, then we report the nonce error, otherwise
// let's report the hash error; no need to report the unsafe-inline error
// anymore.
if (!aNonce.IsEmpty()) {
observerSubject = (aContentType == nsIContentPolicy::TYPE_SCRIPT)
? NS_LITERAL_STRING(SCRIPT_NONCE_VIOLATION_OBSERVER_TOPIC)
: NS_LITERAL_STRING(STYLE_NONCE_VIOLATION_OBSERVER_TOPIC);
}
else {
observerSubject = (aContentType == nsIContentPolicy::TYPE_SCRIPT)
? NS_LITERAL_STRING(SCRIPT_HASH_VIOLATION_OBSERVER_TOPIC)
: NS_LITERAL_STRING(STYLE_HASH_VIOLATION_OBSERVER_TOPIC);
}
nsCOMPtr<nsISupportsCString> selfICString(do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID));
if (selfICString) {
selfICString->SetData(nsDependentCString("self"));
}
nsCOMPtr<nsISupports> selfISupports(do_QueryInterface(selfICString));
// use selfURI as the sourceFile
nsAutoCString sourceFile;
if (mSelfURI) {
mSelfURI->GetSpec(sourceFile);
}
nsAutoString codeSample(aContent);
// cap the length of the script sample at 40 chars
if (codeSample.Length() > 40) {
codeSample.Truncate(40);
codeSample.AppendLiteral("...");
}
AsyncReportViolation(selfISupports, // aBlockedContentSource
mSelfURI, // aOriginalURI
aViolatedDirective, // aViolatedDirective
aViolatedPolicyIndex, // aViolatedPolicyIndex
observerSubject, // aObserverSubject
NS_ConvertUTF8toUTF16(sourceFile), // aSourceFile
codeSample, // aScriptSample
aLineNumber); // aLineNum
}
NS_IMETHODIMP
nsCSPContext::GetAllowsInline(nsContentPolicyType aContentType,
const nsAString& aNonce,
bool aParserCreated,
const nsAString& aContent,
uint32_t aLineNumber,
bool* outAllowsInline)
{
*outAllowsInline = true;
MOZ_ASSERT(aContentType == nsContentUtils::InternalContentPolicyTypeToExternal(aContentType),
"We should only see external content policy types here.");
if (aContentType != nsIContentPolicy::TYPE_SCRIPT &&
aContentType != nsIContentPolicy::TYPE_STYLESHEET) {
MOZ_ASSERT(false, "can only allow inline for script or style");
return NS_OK;
}
// always iterate all policies, otherwise we might not send out all reports
for (uint32_t i = 0; i < mPolicies.Length(); i++) {
bool allowed =
mPolicies[i]->allows(aContentType, CSP_UNSAFE_INLINE, EmptyString(), aParserCreated) ||
Fix whitelisting of JavaScript-uris by CSP hash.
2019-09-20 10:14:30 +00:00
mPolicies[i]->allows(aContentType, CSP_NONCE, aNonce, aParserCreated);
// If the inlined script or style is allowed by either unsafe-inline or the
// nonce, go ahead and shortcut this loop.
if (allowed) {
continue;
}
// Check if the csp-hash matches against the hash of the script.
// If we don't have any content to check, block the script.
if (!aContent.IsEmpty()) {
allowed = mPolicies[i]->allows(aContentType, CSP_HASH, aContent, aParserCreated);
}
basic source
2019-03-11 10:26:37 +00:00
if (!allowed) {
// policy is violoated: deny the load unless policy is report only and
// report the violation.
if (!mPolicies[i]->getReportOnlyFlag()) {
*outAllowsInline = false;
}
nsAutoString violatedDirective;
mPolicies[i]->getDirectiveStringForContentType(aContentType, violatedDirective);
reportInlineViolation(aContentType,
aNonce,
aContent,
violatedDirective,
i,
aLineNumber);
}
}
return NS_OK;
}
/**
* Reduces some code repetition for the various logging situations in
* LogViolationDetails.
*
* Call-sites for the eval/inline checks recieve two return values: allows
* and violates. Based on those, they must choose whether to call
* LogViolationDetails or not. Policies that are report-only allow the
* loads/compilations but violations should still be reported. Not all
* policies in this nsIContentSecurityPolicy instance will be violated,
* which is why we must check allows() again here.
*
* Note: This macro uses some parameters from its caller's context:
* p, mPolicies, this, aSourceFile, aScriptSample, aLineNum, selfISupports
*
* @param violationType: the VIOLATION_TYPE_* constant (partial symbol)
* such as INLINE_SCRIPT
* @param contentPolicyType: a constant from nsIContentPolicy such as TYPE_STYLESHEET
* @param nonceOrHash: for NONCE and HASH violations, it's the nonce or content
* string. For other violations, it is an empty string.
* @param keyword: the keyword corresponding to violation (UNSAFE_INLINE for most)
* @param observerTopic: the observer topic string to send with the CSP
* observer notifications.
*
* Please note that inline violations for scripts are reported within
* GetAllowsInline() and do not call this macro, hence we can pass 'false'
* as the argument _aParserCreated_ to allows().
*/
#define CASE_CHECK_AND_REPORT(violationType, contentPolicyType, nonceOrHash, \
keyword, observerTopic) \
case nsIContentSecurityPolicy::VIOLATION_TYPE_ ## violationType : \
PR_BEGIN_MACRO \
if (!mPolicies[p]->allows(nsIContentPolicy::TYPE_ ## contentPolicyType, \
keyword, nonceOrHash, false)) \
{ \
nsAutoString violatedDirective; \
mPolicies[p]->getDirectiveStringForContentType( \
nsIContentPolicy::TYPE_ ## contentPolicyType, \
violatedDirective); \
this->AsyncReportViolation(selfISupports, nullptr, violatedDirective, p, \
NS_LITERAL_STRING(observerTopic), \
aSourceFile, aScriptSample, aLineNum); \
} \
PR_END_MACRO; \
break
/**
* For each policy, log any violation on the Error Console and send a report
* if a report-uri is present in the policy
*
* @param aViolationType
* one of the VIOLATION_TYPE_* constants, e.g. inline-script or eval
* @param aSourceFile
* name of the source file containing the violation (if available)
* @param aContentSample
* sample of the violating content (to aid debugging)
* @param aLineNum
* source line number of the violation (if available)
* @param aNonce
* (optional) If this is a nonce violation, include the nonce so we can
* recheck to determine which policies were violated and send the
* appropriate reports.
* @param aContent
* (optional) If this is a hash violation, include contents of the inline
* resource in the question so we can recheck the hash in order to
* determine which policies were violated and send the appropriate
* reports.
*/
NS_IMETHODIMP
nsCSPContext::LogViolationDetails(uint16_t aViolationType,
const nsAString& aSourceFile,
const nsAString& aScriptSample,
int32_t aLineNum,
const nsAString& aNonce,
const nsAString& aContent)
{
for (uint32_t p = 0; p < mPolicies.Length(); p++) {
NS_ASSERTION(mPolicies[p], "null pointer in nsTArray<nsCSPPolicy>");
nsCOMPtr<nsISupportsCString> selfICString(do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID));
if (selfICString) {
selfICString->SetData(nsDependentCString("self"));
}
nsCOMPtr<nsISupports> selfISupports(do_QueryInterface(selfICString));
switch (aViolationType) {
CASE_CHECK_AND_REPORT(EVAL, SCRIPT, NS_LITERAL_STRING(""),
CSP_UNSAFE_EVAL, EVAL_VIOLATION_OBSERVER_TOPIC);
CASE_CHECK_AND_REPORT(INLINE_STYLE, STYLESHEET, NS_LITERAL_STRING(""),
CSP_UNSAFE_INLINE, INLINE_STYLE_VIOLATION_OBSERVER_TOPIC);
CASE_CHECK_AND_REPORT(INLINE_SCRIPT, SCRIPT, NS_LITERAL_STRING(""),
CSP_UNSAFE_INLINE, INLINE_SCRIPT_VIOLATION_OBSERVER_TOPIC);
CASE_CHECK_AND_REPORT(NONCE_SCRIPT, SCRIPT, aNonce,
CSP_UNSAFE_INLINE, SCRIPT_NONCE_VIOLATION_OBSERVER_TOPIC);
CASE_CHECK_AND_REPORT(NONCE_STYLE, STYLESHEET, aNonce,
CSP_UNSAFE_INLINE, STYLE_NONCE_VIOLATION_OBSERVER_TOPIC);
CASE_CHECK_AND_REPORT(HASH_SCRIPT, SCRIPT, aContent,
CSP_UNSAFE_INLINE, SCRIPT_HASH_VIOLATION_OBSERVER_TOPIC);
CASE_CHECK_AND_REPORT(HASH_STYLE, STYLESHEET, aContent,
CSP_UNSAFE_INLINE, STYLE_HASH_VIOLATION_OBSERVER_TOPIC);
CASE_CHECK_AND_REPORT(REQUIRE_SRI_FOR_STYLE, STYLESHEET, NS_LITERAL_STRING(""),
CSP_REQUIRE_SRI_FOR, REQUIRE_SRI_STYLE_VIOLATION_OBSERVER_TOPIC);
CASE_CHECK_AND_REPORT(REQUIRE_SRI_FOR_SCRIPT, SCRIPT, NS_LITERAL_STRING(""),
CSP_REQUIRE_SRI_FOR, REQUIRE_SRI_SCRIPT_VIOLATION_OBSERVER_TOPIC);
default:
NS_ASSERTION(false, "LogViolationDetails with invalid type");
break;
}
}
return NS_OK;
}
#undef CASE_CHECK_AND_REPORT
NS_IMETHODIMP
nsCSPContext::SetRequestContext(nsIDOMDocument* aDOMDocument,
nsIPrincipal* aPrincipal)
{
NS_PRECONDITION(aDOMDocument || aPrincipal,
"Can't set context without doc or principal");
NS_ENSURE_ARG(aDOMDocument || aPrincipal);
if (aDOMDocument) {
nsCOMPtr<nsIDocument> doc = do_QueryInterface(aDOMDocument);
mLoadingContext = do_GetWeakReference(doc);
mSelfURI = doc->GetDocumentURI();
mLoadingPrincipal = doc->NodePrincipal();
doc->GetReferrer(mReferrer);
mInnerWindowID = doc->InnerWindowID();
// the innerWindowID is not available for CSPs delivered through the
// header at the time setReqeustContext is called - let's queue up
// console messages until it becomes available, see flushConsoleMessages
mQueueUpMessages = !mInnerWindowID;
mCallingChannelLoadGroup = doc->GetDocumentLoadGroup();
// set the flag on the document for CSP telemetry
doc->SetHasCSP(true);
}
else {
CSPCONTEXTLOG(("No Document in SetRequestContext; can not query loadgroup; sending reports may fail."));
mLoadingPrincipal = aPrincipal;
mLoadingPrincipal->GetURI(getter_AddRefs(mSelfURI));
// if no document is available, then it also does not make sense to queue console messages
// sending messages to the browser conolse instead of the web console in that case.
mQueueUpMessages = false;
}
NS_ASSERTION(mSelfURI, "mSelfURI not available, can not translate 'self' into actual URI");
return NS_OK;
}
struct ConsoleMsgQueueElem {
nsXPIDLString mMsg;
nsString mSourceName;
nsString mSourceLine;
uint32_t mLineNumber;
uint32_t mColumnNumber;
uint32_t mSeverityFlag;
};
void
nsCSPContext::flushConsoleMessages()
{
// should flush messages even if doc is not available
nsCOMPtr<nsIDocument> doc = do_QueryReferent(mLoadingContext);
if (doc) {
mInnerWindowID = doc->InnerWindowID();
}
mQueueUpMessages = false;
for (uint32_t i = 0; i < mConsoleMsgQueue.Length(); i++) {
ConsoleMsgQueueElem &elem = mConsoleMsgQueue[i];
CSP_LogMessage(elem.mMsg, elem.mSourceName, elem.mSourceLine,
elem.mLineNumber, elem.mColumnNumber,
elem.mSeverityFlag, "CSP", mInnerWindowID);
}
mConsoleMsgQueue.Clear();
}
void
nsCSPContext::logToConsole(const char16_t* aName,
const char16_t** aParams,
uint32_t aParamsLength,
const nsAString& aSourceName,
const nsAString& aSourceLine,
uint32_t aLineNumber,
uint32_t aColumnNumber,
uint32_t aSeverityFlag)
{
// let's check if we have to queue up console messages
if (mQueueUpMessages) {
nsXPIDLString msg;
CSP_GetLocalizedStr(aName, aParams, aParamsLength, getter_Copies(msg));
ConsoleMsgQueueElem &elem = *mConsoleMsgQueue.AppendElement();
elem.mMsg = msg;
elem.mSourceName = PromiseFlatString(aSourceName);
elem.mSourceLine = PromiseFlatString(aSourceLine);
elem.mLineNumber = aLineNumber;
elem.mColumnNumber = aColumnNumber;
elem.mSeverityFlag = aSeverityFlag;
return;
}
CSP_LogLocalizedStr(aName, aParams, aParamsLength, aSourceName,
aSourceLine, aLineNumber, aColumnNumber,
aSeverityFlag, "CSP", mInnerWindowID);
}
/**
* Strip URI for reporting according to:
* http://www.w3.org/TR/CSP/#violation-reports
*
* @param aURI
* The uri to be stripped for reporting
* @param aSelfURI
* The uri of the protected resource
* which is needed to enforce the SOP.
* @return ASCII serialization of the uri to be reported.
*/
void
StripURIForReporting(nsIURI* aURI,
nsIURI* aSelfURI,
nsACString& outStrippedURI)
{
// 1) If the origin of uri is a globally unique identifier (for example,
// aURI has a scheme of data, blob, or filesystem), then return the
// ASCII serialization of uri’s scheme.
bool isHttpOrFtp =
(NS_SUCCEEDED(aURI->SchemeIs("http", &isHttpOrFtp)) && isHttpOrFtp) ||
(NS_SUCCEEDED(aURI->SchemeIs("https", &isHttpOrFtp)) && isHttpOrFtp) ||
(NS_SUCCEEDED(aURI->SchemeIs("ftp", &isHttpOrFtp)) && isHttpOrFtp);
if (!isHttpOrFtp) {
// not strictly spec compliant, but what we really care about is
// http/https and also ftp. If it's not http/https or ftp, then treat aURI
// as if it's a globally unique identifier and just return the scheme.
aURI->GetScheme(outStrippedURI);
return;
}
// 2) If the origin of uri is not the same as the origin of the protected
// resource, then return the ASCII serialization of uri’s origin.
if (!NS_SecurityCompareURIs(aSelfURI, aURI, false)) {
// cross origin redirects also fall into this category, see:
// http://www.w3.org/TR/CSP/#violation-reports
aURI->GetPrePath(outStrippedURI);
return;
}
// 3) Return uri, with any fragment component removed.
aURI->GetSpecIgnoringRef(outStrippedURI);
}
/**
* Sends CSP violation reports to all sources listed under report-uri.
*
* @param aBlockedContentSource
* Either a CSP Source (like 'self', as string) or nsIURI: the source
* of the violation.
* @param aOriginalUri
* The original URI if the blocked content is a redirect, else null
* @param aViolatedDirective
* the directive that was violated (string).
* @param aSourceFile
* name of the file containing the inline script violation
* @param aScriptSample
* a sample of the violating inline script
* @param aLineNum
* source line number of the violation (if available)
*/
nsresult
nsCSPContext::SendReports(nsISupports* aBlockedContentSource,
nsIURI* aOriginalURI,
nsAString& aViolatedDirective,
uint32_t aViolatedPolicyIndex,
nsAString& aSourceFile,
nsAString& aScriptSample,
uint32_t aLineNum)
{
NS_ENSURE_ARG_MAX(aViolatedPolicyIndex, mPolicies.Length() - 1);
dom::CSPReport report;
nsresult rv;
// blocked-uri
if (aBlockedContentSource) {
nsAutoCString reportBlockedURI;
nsCOMPtr<nsIURI> uri = do_QueryInterface(aBlockedContentSource);
// could be a string or URI
if (uri) {
StripURIForReporting(uri, mSelfURI, reportBlockedURI);
} else {
nsCOMPtr<nsISupportsCString> cstr = do_QueryInterface(aBlockedContentSource);
if (cstr) {
cstr->GetData(reportBlockedURI);
}
}
if (reportBlockedURI.IsEmpty()) {
// this can happen for frame-ancestors violation where the violating
// ancestor is cross-origin.
NS_WARNING("No blocked URI (null aBlockedContentSource) for CSP violation report.");
}
report.mCsp_report.mBlocked_uri = NS_ConvertUTF8toUTF16(reportBlockedURI);
}
// document-uri
nsAutoCString reportDocumentURI;
StripURIForReporting(mSelfURI, mSelfURI, reportDocumentURI);
report.mCsp_report.mDocument_uri = NS_ConvertUTF8toUTF16(reportDocumentURI);
// original-policy
nsAutoString originalPolicy;
rv = this->GetPolicyString(aViolatedPolicyIndex, originalPolicy);
NS_ENSURE_SUCCESS(rv, rv);
report.mCsp_report.mOriginal_policy = originalPolicy;
// referrer
if (!mReferrer.IsEmpty()) {
report.mCsp_report.mReferrer = mReferrer;
}
// violated-directive
report.mCsp_report.mViolated_directive = aViolatedDirective;
// source-file
if (!aSourceFile.IsEmpty()) {
// if aSourceFile is a URI, we have to make sure to strip fragments
nsCOMPtr<nsIURI> sourceURI;
NS_NewURI(getter_AddRefs(sourceURI), aSourceFile);
if (sourceURI) {
nsAutoCString spec;
sourceURI->GetSpecIgnoringRef(spec);
aSourceFile = NS_ConvertUTF8toUTF16(spec);
}
report.mCsp_report.mSource_file.Construct();
report.mCsp_report.mSource_file.Value() = aSourceFile;
}
// script-sample
if (!aScriptSample.IsEmpty()) {
report.mCsp_report.mScript_sample.Construct();
report.mCsp_report.mScript_sample.Value() = aScriptSample;
}
// line-number
if (aLineNum != 0) {
report.mCsp_report.mLine_number.Construct();
report.mCsp_report.mLine_number.Value() = aLineNum;
}
nsString csp_report;
if (!report.ToJSON(csp_report)) {
return NS_ERROR_FAILURE;
}
// ---------- Assembled, now send it to all the report URIs ----------- //
nsTArray<nsString> reportURIs;
mPolicies[aViolatedPolicyIndex]->getReportURIs(reportURIs);
nsCOMPtr<nsIDocument> doc = do_QueryReferent(mLoadingContext);
nsCOMPtr<nsIURI> reportURI;
nsCOMPtr<nsIChannel> reportChannel;
for (uint32_t r = 0; r < reportURIs.Length(); r++) {
nsAutoCString reportURICstring = NS_ConvertUTF16toUTF8(reportURIs[r]);
// try to create a new uri from every report-uri string
rv = NS_NewURI(getter_AddRefs(reportURI), reportURIs[r]);
if (NS_FAILED(rv)) {
const char16_t* params[] = { reportURIs[r].get() };
CSPCONTEXTLOG(("Could not create nsIURI for report URI %s",
reportURICstring.get()));
logToConsole(u"triedToSendReport", params, ArrayLength(params),
aSourceFile, aScriptSample, aLineNum, 0, nsIScriptError::errorFlag);
continue; // don't return yet, there may be more URIs
}
// try to create a new channel for every report-uri
nsLoadFlags loadFlags = nsIRequest::LOAD_NORMAL | nsIChannel::LOAD_CLASSIFY_URI;
if (doc) {
rv = NS_NewChannel(getter_AddRefs(reportChannel),
reportURI,
doc,
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL,
nsIContentPolicy::TYPE_CSP_REPORT,
nullptr, // aLoadGroup
nullptr, // aCallbacks
loadFlags);
}
else {
rv = NS_NewChannel(getter_AddRefs(reportChannel),
reportURI,
mLoadingPrincipal,
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL,
nsIContentPolicy::TYPE_CSP_REPORT,
nullptr, // aLoadGroup
nullptr, // aCallbacks
loadFlags);
}
if (NS_FAILED(rv)) {
CSPCONTEXTLOG(("Could not create new channel for report URI %s",
reportURICstring.get()));
continue; // don't return yet, there may be more URIs
}
// log a warning to console if scheme is not http or https
bool isHttpScheme =
(NS_SUCCEEDED(reportURI->SchemeIs("http", &isHttpScheme)) && isHttpScheme) ||
(NS_SUCCEEDED(reportURI->SchemeIs("https", &isHttpScheme)) && isHttpScheme);
if (!isHttpScheme) {
const char16_t* params[] = { reportURIs[r].get() };
logToConsole(u"reportURInotHttpsOrHttp2", params, ArrayLength(params),
aSourceFile, aScriptSample, aLineNum, 0, nsIScriptError::errorFlag);
continue;
}
// make sure this is an anonymous request (no cookies) so in case the
// policy URI is injected, it can't be abused for CSRF.
nsLoadFlags flags;
rv = reportChannel->GetLoadFlags(&flags);
NS_ENSURE_SUCCESS(rv, rv);
flags |= nsIRequest::LOAD_ANONYMOUS;
rv = reportChannel->SetLoadFlags(flags);
NS_ENSURE_SUCCESS(rv, rv);
// we need to set an nsIChannelEventSink on the channel object
// so we can tell it to not follow redirects when posting the reports
RefPtr<CSPReportRedirectSink> reportSink = new CSPReportRedirectSink();
if (doc && doc->GetDocShell()) {
nsCOMPtr<nsINetworkInterceptController> interceptController =
do_QueryInterface(doc->GetDocShell());
reportSink->SetInterceptController(interceptController);
}
reportChannel->SetNotificationCallbacks(reportSink);
// apply the loadgroup from the channel taken by setRequestContext. If
// there's no loadgroup, AsyncOpen will fail on process-split necko (since
// the channel cannot query the iTabChild).
rv = reportChannel->SetLoadGroup(mCallingChannelLoadGroup);
NS_ENSURE_SUCCESS(rv, rv);
// wire in the string input stream to send the report
nsCOMPtr<nsIStringInputStream> sis(do_CreateInstance(NS_STRINGINPUTSTREAM_CONTRACTID));
NS_ASSERTION(sis, "nsIStringInputStream is needed but not available to send CSP violation reports");
nsAutoCString utf8CSPReport = NS_ConvertUTF16toUTF8(csp_report);
rv = sis->SetData(utf8CSPReport.get(), utf8CSPReport.Length());
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIUploadChannel> uploadChannel(do_QueryInterface(reportChannel));
if (!uploadChannel) {
// It's possible the URI provided can't be uploaded to, in which case
// we skip this one. We'll already have warned about a non-HTTP URI earlier.
continue;
}
rv = uploadChannel->SetUploadStream(sis, NS_LITERAL_CSTRING("application/csp-report"), -1);
NS_ENSURE_SUCCESS(rv, rv);
// if this is an HTTP channel, set the request method to post
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(reportChannel));
if (httpChannel) {
httpChannel->SetRequestMethod(NS_LITERAL_CSTRING("POST"));
}
RefPtr<CSPViolationReportListener> listener = new CSPViolationReportListener();
rv = reportChannel->AsyncOpen2(listener);
// AsyncOpen should not fail, but could if there's no load group (like if
// SetRequestContext is not given a channel). This should fail quietly and
// not return an error since it's really ok if reports don't go out, but
// it's good to log the error locally.
if (NS_FAILED(rv)) {
const char16_t* params[] = { reportURIs[r].get() };
CSPCONTEXTLOG(("AsyncOpen failed for report URI %s", params[0]));
logToConsole(u"triedToSendReport", params, ArrayLength(params),
aSourceFile, aScriptSample, aLineNum, 0, nsIScriptError::errorFlag);
} else {
CSPCONTEXTLOG(("Sent violation report to URI %s", reportURICstring.get()));
}
}
return NS_OK;
}
/**
* Dispatched from the main thread to send reports for one CSP violation.
*/
class CSPReportSenderRunnable final : public Runnable
{
public:
CSPReportSenderRunnable(nsISupports* aBlockedContentSource,
nsIURI* aOriginalURI,
uint32_t aViolatedPolicyIndex,
bool aReportOnlyFlag,
const nsAString& aViolatedDirective,
const nsAString& aObserverSubject,
const nsAString& aSourceFile,
const nsAString& aScriptSample,
uint32_t aLineNum,
nsCSPContext* aCSPContext)
: mBlockedContentSource(aBlockedContentSource)
, mOriginalURI(aOriginalURI)
, mViolatedPolicyIndex(aViolatedPolicyIndex)
, mReportOnlyFlag(aReportOnlyFlag)
, mViolatedDirective(aViolatedDirective)
, mSourceFile(aSourceFile)
, mScriptSample(aScriptSample)
, mLineNum(aLineNum)
, mCSPContext(aCSPContext)
{
NS_ASSERTION(!aViolatedDirective.IsEmpty(), "Can not send reports without a violated directive");
// the observer subject is an nsISupports: either an nsISupportsCString
// from the arg passed in directly, or if that's empty, it's the blocked
// source.
if (aObserverSubject.IsEmpty()) {
mObserverSubject = aBlockedContentSource;
} else {
nsCOMPtr<nsISupportsCString> supportscstr =
do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID);
NS_ASSERTION(supportscstr, "Couldn't allocate nsISupportsCString");
supportscstr->SetData(NS_ConvertUTF16toUTF8(aObserverSubject));
mObserverSubject = do_QueryInterface(supportscstr);
}
}
NS_IMETHOD Run() override
{
MOZ_ASSERT(NS_IsMainThread());
// 1) notify observers
nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
NS_ASSERTION(observerService, "needs observer service");
nsresult rv = observerService->NotifyObservers(mObserverSubject,
CSP_VIOLATION_TOPIC,
mViolatedDirective.get());
NS_ENSURE_SUCCESS(rv, rv);
// 2) send reports for the policy that was violated
mCSPContext->SendReports(mBlockedContentSource, mOriginalURI,
mViolatedDirective, mViolatedPolicyIndex,
mSourceFile, mScriptSample, mLineNum);
// 3) log to console (one per policy violation)
// mBlockedContentSource could be a URI or a string.
nsCOMPtr<nsIURI> blockedURI = do_QueryInterface(mBlockedContentSource);
// if mBlockedContentSource is not a URI, it could be a string
nsCOMPtr<nsISupportsCString> blockedString = do_QueryInterface(mBlockedContentSource);
nsCString blockedDataStr;
if (blockedURI) {
blockedURI->GetSpec(blockedDataStr);
bool isData = false;
rv = blockedURI->SchemeIs("data", &isData);
if (NS_SUCCEEDED(rv) && isData) {
blockedDataStr.Truncate(40);
blockedDataStr.AppendASCII("...");
}
} else if (blockedString) {
blockedString->GetData(blockedDataStr);
}
if (blockedDataStr.Length() > 0) {
nsString blockedDataChar16 = NS_ConvertUTF8toUTF16(blockedDataStr);
const char16_t* params[] = { mViolatedDirective.get(),
blockedDataChar16.get() };
mCSPContext->logToConsole(mReportOnlyFlag ? u"CSPROViolationWithURI" :
u"CSPViolationWithURI",
params, ArrayLength(params), mSourceFile, mScriptSample,
mLineNum, 0, nsIScriptError::errorFlag);
}
return NS_OK;
}
private:
nsCOMPtr<nsISupports> mBlockedContentSource;
nsCOMPtr<nsIURI> mOriginalURI;
uint32_t mViolatedPolicyIndex;
bool mReportOnlyFlag;
nsString mViolatedDirective;
nsCOMPtr<nsISupports> mObserverSubject;
nsString mSourceFile;
nsString mScriptSample;
uint32_t mLineNum;
RefPtr<nsCSPContext> mCSPContext;
};
/**
* Asynchronously notifies any nsIObservers listening to the CSP violation
* topic that a violation occurred. Also triggers report sending and console
* logging. All asynchronous on the main thread.
*
* @param aBlockedContentSource
* Either a CSP Source (like 'self', as string) or nsIURI: the source
* of the violation.
* @param aOriginalUri
* The original URI if the blocked content is a redirect, else null
* @param aViolatedDirective
* the directive that was violated (string).
* @param aViolatedPolicyIndex
* the index of the policy that was violated (so we know where to send
* the reports).
* @param aObserverSubject
* optional, subject sent to the nsIObservers listening to the CSP
* violation topic.
* @param aSourceFile
* name of the file containing the inline script violation
* @param aScriptSample
* a sample of the violating inline script
* @param aLineNum
* source line number of the violation (if available)
*/
nsresult
nsCSPContext::AsyncReportViolation(nsISupports* aBlockedContentSource,
nsIURI* aOriginalURI,
const nsAString& aViolatedDirective,
uint32_t aViolatedPolicyIndex,
const nsAString& aObserverSubject,
const nsAString& aSourceFile,
const nsAString& aScriptSample,
uint32_t aLineNum)
{
NS_ENSURE_ARG_MAX(aViolatedPolicyIndex, mPolicies.Length() - 1);
NS_DispatchToMainThread(new CSPReportSenderRunnable(aBlockedContentSource,
aOriginalURI,
aViolatedPolicyIndex,
mPolicies[aViolatedPolicyIndex]->getReportOnlyFlag(),
aViolatedDirective,
aObserverSubject,
aSourceFile,
aScriptSample,
aLineNum,
this));
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::RequireSRIForType(nsContentPolicyType aContentType, bool* outRequiresSRIForType)
{
*outRequiresSRIForType = false;
for (uint32_t i = 0; i < mPolicies.Length(); i++) {
if (mPolicies[i]->hasDirective(REQUIRE_SRI_FOR)) {
if (mPolicies[i]->requireSRIForType(aContentType)) {
*outRequiresSRIForType = true;
return NS_OK;
}
}
}
return NS_OK;
}
/**
* Based on the given docshell, determines if this CSP context allows the
* ancestry.
*
* In order to determine the URI of the parent document (one causing the load
* of this protected document), this function obtains the docShellTreeItem,
* then walks up the hierarchy until it finds a privileged (chrome) tree item.
* Getting the a tree item's URI looks like this in pseudocode:
*
* nsIDocShellTreeItem->GetDocument()->GetDocumentURI();
*
* aDocShell is the docShell for the protected document.
*/
NS_IMETHODIMP
nsCSPContext::PermitsAncestry(nsIDocShell* aDocShell, bool* outPermitsAncestry)
{
nsresult rv;
// Can't check ancestry without a docShell.
if (aDocShell == nullptr) {
return NS_ERROR_FAILURE;
}
*outPermitsAncestry = true;
// extract the ancestry as an array
nsCOMArray<nsIURI> ancestorsArray;
nsCOMPtr<nsIInterfaceRequestor> ir(do_QueryInterface(aDocShell));
nsCOMPtr<nsIDocShellTreeItem> treeItem(do_GetInterface(ir));
nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
nsCOMPtr<nsIURI> currentURI;
nsCOMPtr<nsIURI> uriClone;
// iterate through each docShell parent item
while (NS_SUCCEEDED(treeItem->GetParent(getter_AddRefs(parentTreeItem))) &&
parentTreeItem != nullptr) {
nsIDocument* doc = parentTreeItem->GetDocument();
NS_ASSERTION(doc, "Could not get nsIDocument from nsIDocShellTreeItem in nsCSPContext::PermitsAncestry");
NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
currentURI = doc->GetDocumentURI();
if (currentURI) {
// stop when reaching chrome
bool isChrome = false;
rv = currentURI->SchemeIs("chrome", &isChrome);
NS_ENSURE_SUCCESS(rv, rv);
if (isChrome) { break; }
// delete the userpass from the URI.
rv = currentURI->CloneIgnoringRef(getter_AddRefs(uriClone));
NS_ENSURE_SUCCESS(rv, rv);
// We don't care if this succeeds, just want to delete a userpass if
// there was one.
uriClone->SetUserPass(EmptyCString());
if (CSPCONTEXTLOGENABLED()) {
CSPCONTEXTLOG(("nsCSPContext::PermitsAncestry, found ancestor: %s",
uriClone->GetSpecOrDefault().get()));
}
ancestorsArray.AppendElement(uriClone);
}
// next ancestor
treeItem = parentTreeItem;
}
nsAutoString violatedDirective;
// Now that we've got the ancestry chain in ancestorsArray, time to check
// them against any CSP.
// NOTE: the ancestors are not allowed to be sent cross origin; this is a
// restriction not placed on subresource loads.
for (uint32_t a = 0; a < ancestorsArray.Length(); a++) {
if (CSPCONTEXTLOGENABLED()) {
CSPCONTEXTLOG(("nsCSPContext::PermitsAncestry, checking ancestor: %s",
ancestorsArray[a]->GetSpecOrDefault().get()));
}
// omit the ancestor URI in violation reports if cross-origin as per spec
// (it is a violation of the same-origin policy).
bool okToSendAncestor = NS_SecurityCompareURIs(ancestorsArray[a], mSelfURI, true);
bool permits = permitsInternal(nsIContentSecurityPolicy::FRAME_ANCESTORS_DIRECTIVE,
ancestorsArray[a],
nullptr, // no redirect here.
EmptyString(), // no nonce
false, // no redirect here.
false, // not a preload.
true, // specific, do not use default-src
true, // send violation reports
okToSendAncestor,
false); // not parser created
if (!permits) {
*outPermitsAncestry = false;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::Permits(nsIURI* aURI,
CSPDirective aDir,
bool aSpecific,
bool* outPermits)
{
// Can't perform check without aURI
if (aURI == nullptr) {
return NS_ERROR_FAILURE;
}
*outPermits = permitsInternal(aDir,
aURI,
nullptr, // no original (pre-redirect) URI
EmptyString(), // no nonce
false, // not redirected.
false, // not a preload.
aSpecific,
true, // send violation reports
true, // send blocked URI in violation reports
false); // not parser created
if (CSPCONTEXTLOGENABLED()) {
CSPCONTEXTLOG(("nsCSPContext::Permits, aUri: %s, aDir: %d, isAllowed: %s",
aURI->GetSpecOrDefault().get(), aDir,
*outPermits ? "allow" : "deny"));
}
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::ToJSON(nsAString& outCSPinJSON)
{
outCSPinJSON.Truncate();
dom::CSPPolicies jsonPolicies;
jsonPolicies.mCsp_policies.Construct();
for (uint32_t p = 0; p < mPolicies.Length(); p++) {
dom::CSP jsonCSP;
mPolicies[p]->toDomCSPStruct(jsonCSP);
jsonPolicies.mCsp_policies.Value().AppendElement(jsonCSP, fallible);
}
// convert the gathered information to JSON
if (!jsonPolicies.ToJSON(outCSPinJSON)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::GetCSPSandboxFlags(uint32_t* aOutSandboxFlags)
{
if (!aOutSandboxFlags) {
return NS_ERROR_FAILURE;
}
*aOutSandboxFlags = SANDBOXED_NONE;
for (uint32_t i = 0; i < mPolicies.Length(); i++) {
uint32_t flags = mPolicies[i]->getSandboxFlags();
// current policy doesn't have sandbox flag, check next policy
if (!flags) {
continue;
}
// current policy has sandbox flags, if the policy is in enforcement-mode
// (i.e. not report-only) set these flags and check for policies with more
// restrictions
if (!mPolicies[i]->getReportOnlyFlag()) {
*aOutSandboxFlags |= flags;
} else {
// sandbox directive is ignored in report-only mode, warn about it and
// continue the loop checking for an enforcement policy.
nsAutoString policy;
mPolicies[i]->toString(policy);
CSPCONTEXTLOG(("nsCSPContext::GetCSPSandboxFlags, report only policy, ignoring sandbox in: %s",
policy.get()));
const char16_t* params[] = { policy.get() };
logToConsole(u"ignoringReportOnlyDirective", params, ArrayLength(params),
EmptyString(), EmptyString(), 0, 0, nsIScriptError::warningFlag);
}
}
return NS_OK;
}
/* ========== CSPViolationReportListener implementation ========== */
NS_IMPL_ISUPPORTS(CSPViolationReportListener, nsIStreamListener, nsIRequestObserver, nsISupports);
CSPViolationReportListener::CSPViolationReportListener()
{
}
CSPViolationReportListener::~CSPViolationReportListener()
{
}
nsresult
AppendSegmentToString(nsIInputStream* aInputStream,
void* aClosure,
const char* aRawSegment,
uint32_t aToOffset,
uint32_t aCount,
uint32_t* outWrittenCount)
{
nsCString* decodedData = static_cast<nsCString*>(aClosure);
decodedData->Append(aRawSegment, aCount);
*outWrittenCount = aCount;
return NS_OK;
}
NS_IMETHODIMP
CSPViolationReportListener::OnDataAvailable(nsIRequest* aRequest,
nsISupports* aContext,
nsIInputStream* aInputStream,
uint64_t aOffset,
uint32_t aCount)
{
uint32_t read;
nsCString decodedData;
return aInputStream->ReadSegments(AppendSegmentToString,
&decodedData,
aCount,
&read);
}
NS_IMETHODIMP
CSPViolationReportListener::OnStopRequest(nsIRequest* aRequest,
nsISupports* aContext,
nsresult aStatus)
{
return NS_OK;
}
NS_IMETHODIMP
CSPViolationReportListener::OnStartRequest(nsIRequest* aRequest,
nsISupports* aContext)
{
return NS_OK;
}
/* ========== CSPReportRedirectSink implementation ========== */
NS_IMPL_ISUPPORTS(CSPReportRedirectSink, nsIChannelEventSink, nsIInterfaceRequestor);
CSPReportRedirectSink::CSPReportRedirectSink()
{
}
CSPReportRedirectSink::~CSPReportRedirectSink()
{
}
NS_IMETHODIMP
CSPReportRedirectSink::AsyncOnChannelRedirect(nsIChannel* aOldChannel,
nsIChannel* aNewChannel,
uint32_t aRedirFlags,
nsIAsyncVerifyRedirectCallback* aCallback)
{
// cancel the old channel so XHR failure callback happens
nsresult rv = aOldChannel->Cancel(NS_ERROR_ABORT);
NS_ENSURE_SUCCESS(rv, rv);
// notify an observer that we have blocked the report POST due to a redirect,
// used in testing, do this async since we're in an async call now to begin with
nsCOMPtr<nsIURI> uri;
rv = aOldChannel->GetURI(getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
NS_ASSERTION(observerService, "Observer service required to log CSP violations");
observerService->NotifyObservers(uri,
CSP_VIOLATION_TOPIC,
u"denied redirect while sending violation report");
return NS_BINDING_REDIRECTED;
}
NS_IMETHODIMP
CSPReportRedirectSink::GetInterface(const nsIID& aIID, void** aResult)
{
if (aIID.Equals(NS_GET_IID(nsINetworkInterceptController)) &&
mInterceptController) {
nsCOMPtr<nsINetworkInterceptController> copy(mInterceptController);
*aResult = copy.forget().take();
return NS_OK;
}
return QueryInterface(aIID, aResult);
}
void
CSPReportRedirectSink::SetInterceptController(nsINetworkInterceptController* aInterceptController)
{
mInterceptController = aInterceptController;
}
/* ===== nsISerializable implementation ====== */
NS_IMETHODIMP
nsCSPContext::Read(nsIObjectInputStream* aStream)
{
nsresult rv;
nsCOMPtr<nsISupports> supports;
rv = NS_ReadOptionalObject(aStream, true, getter_AddRefs(supports));
NS_ENSURE_SUCCESS(rv, rv);
mSelfURI = do_QueryInterface(supports);
NS_ASSERTION(mSelfURI, "need a self URI to de-serialize");
uint32_t numPolicies;
rv = aStream->Read32(&numPolicies);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoString policyString;
while (numPolicies > 0) {
numPolicies--;
rv = aStream->ReadString(policyString);
NS_ENSURE_SUCCESS(rv, rv);
bool reportOnly = false;
rv = aStream->ReadBoolean(&reportOnly);
NS_ENSURE_SUCCESS(rv, rv);
// @param deliveredViaMetaTag:
// when parsing the CSP policy string initially we already remove directives
// that should not be processed when delivered via the meta tag. Such directives
// will not be present at this point anymore.
nsCSPPolicy* policy = nsCSPParser::parseContentSecurityPolicy(policyString,
mSelfURI,
reportOnly,
this,
false);
if (policy) {
mPolicies.AppendElement(policy);
}
}
return NS_OK;
}
NS_IMETHODIMP
nsCSPContext::Write(nsIObjectOutputStream* aStream)
{
nsresult rv = NS_WriteOptionalCompoundObject(aStream,
mSelfURI,
NS_GET_IID(nsIURI),
true);
NS_ENSURE_SUCCESS(rv, rv);
// Serialize all the policies.
aStream->Write32(mPolicies.Length());
nsAutoString polStr;
for (uint32_t p = 0; p < mPolicies.Length(); p++) {
polStr.Truncate();
mPolicies[p]->toString(polStr);
aStream->WriteWStringZ(polStr.get());
aStream->WriteBoolean(mPolicies[p]->getReportOnlyFlag());
}
return NS_OK;
}
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