mozilla
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gecko-dev
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gecko-dev/dom/security/SRICheck.cpp

296 строки
11 KiB
C++
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "SRICheck.h"
#include "mozilla/Base64.h"
#include "mozilla/Logging.h"
#include "mozilla/Preferences.h"
#include "nsContentUtils.h"
#include "nsICryptoHash.h"
#include "nsIDocument.h"
#include "nsIProtocolHandler.h"
#include "nsIScriptError.h"
#include "nsIScriptSecurityManager.h"
#include "nsIURI.h"
#include "nsNetUtil.h"
#include "nsWhitespaceTokenizer.h"
static PRLogModuleInfo*
GetSriLog()
{
static PRLogModuleInfo *gSriPRLog;
if (!gSriPRLog) {
gSriPRLog = PR_NewLogModule("SRI");
}
return gSriPRLog;
}
#define SRILOG(args) MOZ_LOG(GetSriLog(), mozilla::LogLevel::Debug, args)
#define SRIERROR(args) MOZ_LOG(GetSriLog(), mozilla::LogLevel::Error, args)
namespace mozilla {
namespace dom {
/**
* Returns whether or not the sub-resource about to be loaded is eligible
* for integrity checks. If it's not, the checks will be skipped and the
* sub-resource will be loaded.
*/
static nsresult
IsEligible(nsIURI* aRequestURI, const CORSMode aCORSMode,
const nsIDocument* aDocument)
{
NS_ENSURE_ARG_POINTER(aRequestURI);
NS_ENSURE_ARG_POINTER(aDocument);
nsAutoCString requestSpec;
nsresult rv = aRequestURI->GetSpec(requestSpec);
NS_ENSURE_SUCCESS(rv, rv);
NS_ConvertUTF8toUTF16 requestSpecUTF16(requestSpec);
// Was the sub-resource loaded via CORS?
if (aCORSMode != CORS_NONE) {
SRILOG(("SRICheck::IsEligible, CORS mode"));
return NS_OK;
}
// Is the sub-resource same-origin?
nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
if (NS_SUCCEEDED(ssm->CheckSameOriginURI(aDocument->GetDocumentURI(),
aRequestURI, false))) {
SRILOG(("SRICheck::IsEligible, same-origin"));
return NS_OK;
}
if (MOZ_LOG_TEST(GetSriLog(), mozilla::LogLevel::Debug)) {
nsAutoCString documentURI;
aDocument->GetDocumentURI()->GetAsciiSpec(documentURI);
// documentURI will be empty if GetAsciiSpec failed
SRILOG(("SRICheck::IsEligible, NOT same origin: documentURI=%s; requestURI=%s",
documentURI.get(), requestSpec.get()));
}
const char16_t* params[] = { requestSpecUTF16.get() };
nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
NS_LITERAL_CSTRING("Sub-resource Integrity"),
aDocument,
nsContentUtils::eSECURITY_PROPERTIES,
"IneligibleResource",
params, ArrayLength(params));
return NS_ERROR_SRI_NOT_ELIGIBLE;
}
/**
* Compute the hash of a sub-resource and compare it with the expected
* value.
*/
static nsresult
VerifyHash(const SRIMetadata& aMetadata, uint32_t aHashIndex,
uint32_t aStringLen, const uint8_t* aString,
const nsIDocument* aDocument)
{
NS_ENSURE_ARG_POINTER(aString);
NS_ENSURE_ARG_POINTER(aDocument);
nsAutoCString base64Hash;
aMetadata.GetHash(aHashIndex, &base64Hash);
SRILOG(("SRICheck::VerifyHash, hash[%u]=%s", aHashIndex, base64Hash.get()));
nsAutoCString binaryHash;
if (NS_WARN_IF(NS_FAILED(Base64Decode(base64Hash, binaryHash)))) {
nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
NS_LITERAL_CSTRING("Sub-resource Integrity"),
aDocument,
nsContentUtils::eSECURITY_PROPERTIES,
"InvalidIntegrityBase64");
return NS_ERROR_SRI_CORRUPT;
}
uint32_t hashLength;
int8_t hashType;
aMetadata.GetHashType(&hashType, &hashLength);
if (binaryHash.Length() != hashLength) {
nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
NS_LITERAL_CSTRING("Sub-resource Integrity"),
aDocument,
nsContentUtils::eSECURITY_PROPERTIES,
"InvalidIntegrityLength");
return NS_ERROR_SRI_CORRUPT;
}
nsresult rv;
nsCOMPtr<nsICryptoHash> cryptoHash =
do_CreateInstance("@mozilla.org/security/hash;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
rv = cryptoHash->Init(hashType);
NS_ENSURE_SUCCESS(rv, rv);
rv = cryptoHash->Update(aString, aStringLen);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString computedHash;
rv = cryptoHash->Finish(false, computedHash);
NS_ENSURE_SUCCESS(rv, rv);
if (!binaryHash.Equals(computedHash)) {
SRILOG(("SRICheck::VerifyHash, hash[%u] did not match", aHashIndex));
return NS_ERROR_SRI_CORRUPT;
}
SRILOG(("SRICheck::VerifyHash, hash[%u] verified successfully", aHashIndex));
return NS_OK;
}
/* static */ nsresult
SRICheck::IntegrityMetadata(const nsAString& aMetadataList,
const nsIDocument* aDocument,
SRIMetadata* outMetadata)
{
NS_ENSURE_ARG_POINTER(outMetadata);
NS_ENSURE_ARG_POINTER(aDocument);
MOZ_ASSERT(outMetadata->IsEmpty()); // caller must pass empty metadata
if (!Preferences::GetBool("security.sri.enable", false)) {
SRILOG(("SRICheck::IntegrityMetadata, sri is disabled (pref)"));
return NS_ERROR_SRI_DISABLED;
}
// put a reasonable bound on the length of the metadata
NS_ConvertUTF16toUTF8 metadataList(aMetadataList);
if (metadataList.Length() > SRICheck::MAX_METADATA_LENGTH) {
metadataList.Truncate(SRICheck::MAX_METADATA_LENGTH);
}
MOZ_ASSERT(metadataList.Length() <= aMetadataList.Length());
// the integrity attribute is a list of whitespace-separated hashes
// and options so we need to look at them one by one and pick the
// strongest (valid) one
nsCWhitespaceTokenizer tokenizer(metadataList);
nsAutoCString token;
for (uint32_t i=0; tokenizer.hasMoreTokens() &&
i < SRICheck::MAX_METADATA_TOKENS; ++i) {
token = tokenizer.nextToken();
SRIMetadata metadata(token);
if (metadata.IsMalformed()) {
NS_ConvertUTF8toUTF16 tokenUTF16(token);
const char16_t* params[] = { tokenUTF16.get() };
nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
NS_LITERAL_CSTRING("Sub-resource Integrity"),
aDocument,
nsContentUtils::eSECURITY_PROPERTIES,
"MalformedIntegrityURI",
params, ArrayLength(params));
} else if (!metadata.IsAlgorithmSupported()) {
nsAutoCString alg;
metadata.GetAlgorithm(&alg);
NS_ConvertUTF8toUTF16 algUTF16(alg);
const char16_t* params[] = { algUTF16.get() };
nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
NS_LITERAL_CSTRING("Sub-resource Integrity"),
aDocument,
nsContentUtils::eSECURITY_PROPERTIES,
"UnsupportedHashAlg",
params, ArrayLength(params));
}
nsAutoCString alg1, alg2;
if (MOZ_LOG_TEST(GetSriLog(), mozilla::LogLevel::Debug)) {
outMetadata->GetAlgorithm(&alg1);
metadata.GetAlgorithm(&alg2);
}
if (*outMetadata == metadata) {
SRILOG(("SRICheck::IntegrityMetadata, alg '%s' is the same as '%s'",
alg1.get(), alg2.get()));
*outMetadata += metadata; // add new hash to strongest metadata
} else if (*outMetadata < metadata) {
SRILOG(("SRICheck::IntegrityMetadata, alg '%s' is weaker than '%s'",
alg1.get(), alg2.get()));
*outMetadata = metadata; // replace strongest metadata with current
}
}
if (MOZ_LOG_TEST(GetSriLog(), mozilla::LogLevel::Debug)) {
if (outMetadata->IsValid()) {
nsAutoCString alg;
outMetadata->GetAlgorithm(&alg);
SRILOG(("SRICheck::IntegrityMetadata, using a '%s' hash", alg.get()));
} else if (outMetadata->IsEmpty()) {
SRILOG(("SRICheck::IntegrityMetadata, no metadata"));
} else {
SRILOG(("SRICheck::IntegrityMetadata, no valid metadata found"));
}
}
return NS_OK;
}
/* static */ nsresult
SRICheck::VerifyIntegrity(const SRIMetadata& aMetadata,
nsIURI* aRequestURI,
const CORSMode aCORSMode,
const nsAString& aString,
const nsIDocument* aDocument)
{
NS_ConvertUTF16toUTF8 utf8Hash(aString);
return VerifyIntegrity(aMetadata, aRequestURI, aCORSMode, utf8Hash.Length(),
(uint8_t*)utf8Hash.get(), aDocument);
}
/* static */ nsresult
SRICheck::VerifyIntegrity(const SRIMetadata& aMetadata,
nsIURI* aRequestURI,
const CORSMode aCORSMode,
uint32_t aStringLen,
const uint8_t* aString,
const nsIDocument* aDocument)
{
if (MOZ_LOG_TEST(GetSriLog(), mozilla::LogLevel::Debug)) {
nsAutoCString requestURL;
aRequestURI->GetAsciiSpec(requestURL);
// requestURL will be empty if GetAsciiSpec fails
SRILOG(("SRICheck::VerifyIntegrity, url=%s (length=%u)",
requestURL.get(), aStringLen));
}
MOZ_ASSERT(!aMetadata.IsEmpty()); // should be checked by caller
// IntegrityMetadata() checks this and returns "no metadata" if
// it's disabled so we should never make it this far
MOZ_ASSERT(Preferences::GetBool("security.sri.enable", false));
if (NS_FAILED(IsEligible(aRequestURI, aCORSMode, aDocument))) {
return NS_OK; // ignore non-CORS resources for forward-compatibility
}
if (!aMetadata.IsValid()) {
nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
NS_LITERAL_CSTRING("Sub-resource Integrity"),
aDocument,
nsContentUtils::eSECURITY_PROPERTIES,
"NoValidMetadata");
return NS_OK; // ignore invalid metadata for forward-compatibility
}
for (uint32_t i = 0; i < aMetadata.HashCount(); i++) {
if (NS_SUCCEEDED(VerifyHash(aMetadata, i, aStringLen,
aString, aDocument))) {
return NS_OK; // stop at the first valid hash
}
}
nsAutoCString alg;
aMetadata.GetAlgorithm(&alg);
NS_ConvertUTF8toUTF16 algUTF16(alg);
const char16_t* params[] = { algUTF16.get() };
nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
NS_LITERAL_CSTRING("Sub-resource Integrity"),
aDocument,
nsContentUtils::eSECURITY_PROPERTIES,
"IntegrityMismatch",
params, ArrayLength(params));
return NS_ERROR_SRI_CORRUPT;
}
} // namespace dom
} // namespace mozilla
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