Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 516 insertions, 0 deletions

diff --git a/dom/security/SRICheck.cpp b/dom/security/SRICheck.cpp
new file mode 100644
index 0000000000..61d34bfb5a
--- /dev/null
+++ b/dom/security/SRICheck.cpp
@@ -0,0 +1,516 @@
+/* -*- 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/LoadTainting.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/dom/SRILogHelper.h"
+#include "mozilla/dom/SRIMetadata.h"
+#include "nsComponentManagerUtils.h"
+#include "nsContentUtils.h"
+#include "nsIChannel.h"
+#include "nsIConsoleReportCollector.h"
+#include "nsIScriptError.h"
+#include "nsIURI.h"
+#include "nsNetUtil.h"
+#include "nsWhitespaceTokenizer.h"
+
+#define SRIVERBOSE(args) \
+  MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Verbose, args)
+#define SRILOG(args) \
+  MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug, args)
+#define SRIERROR(args) \
+  MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Error, args)
+
+namespace mozilla::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(nsIChannel* aChannel,
+                           mozilla::LoadTainting aTainting,
+                           const nsACString& aSourceFileURI,
+                           nsIConsoleReportCollector* aReporter) {
+  NS_ENSURE_ARG_POINTER(aReporter);
+
+  if (!aChannel) {
+    SRILOG(("SRICheck::IsEligible, null channel"));
+    return NS_ERROR_SRI_NOT_ELIGIBLE;
+  }
+
+  // Was the sub-resource loaded via CORS?
+  if (aTainting == LoadTainting::CORS) {
+    SRILOG(("SRICheck::IsEligible, CORS mode"));
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIURI> finalURI;
+  nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(finalURI));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIURI> originalURI;
+  rv = aChannel->GetOriginalURI(getter_AddRefs(originalURI));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsAutoCString requestSpec;
+  rv = originalURI->GetSpec(requestSpec);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (MOZ_LOG_TEST(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug)) {
+    SRILOG(("SRICheck::IsEligible, requestURI=%s; finalURI=%s",
+            requestSpec.get(),
+            finalURI ? finalURI->GetSpecOrDefault().get() : ""));
+  }
+
+  // Is the sub-resource same-origin?
+  if (aTainting == LoadTainting::Basic) {
+    SRILOG(("SRICheck::IsEligible, same-origin"));
+    return NS_OK;
+  }
+  SRILOG(("SRICheck::IsEligible, NOT same-origin"));
+
+  NS_ConvertUTF8toUTF16 requestSpecUTF16(requestSpec);
+  nsTArray<nsString> params;
+  params.AppendElement(requestSpecUTF16);
+  aReporter->AddConsoleReport(
+      nsIScriptError::errorFlag, "Sub-resource Integrity"_ns,
+      nsContentUtils::eSECURITY_PROPERTIES, aSourceFileURI, 0, 0,
+      "IneligibleResource"_ns, const_cast<const nsTArray<nsString>&>(params));
+  return NS_ERROR_SRI_NOT_ELIGIBLE;
+}
+
+/* static */
+nsresult SRICheck::IntegrityMetadata(const nsAString& aMetadataList,
+                                     const nsACString& aSourceFileURI,
+                                     nsIConsoleReportCollector* aReporter,
+                                     SRIMetadata* outMetadata) {
+  NS_ENSURE_ARG_POINTER(outMetadata);
+  NS_ENSURE_ARG_POINTER(aReporter);
+  MOZ_ASSERT(outMetadata->IsEmpty());  // caller must pass empty metadata
+
+  // 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);
+  }
+  SRILOG(("SRICheck::IntegrityMetadata, metadataList=%s", metadataList.get()));
+
+  // 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);
+      nsTArray<nsString> params;
+      params.AppendElement(tokenUTF16);
+      aReporter->AddConsoleReport(
+          nsIScriptError::warningFlag, "Sub-resource Integrity"_ns,
+          nsContentUtils::eSECURITY_PROPERTIES, aSourceFileURI, 0, 0,
+          "MalformedIntegrityHash"_ns,
+          const_cast<const nsTArray<nsString>&>(params));
+    } else if (!metadata.IsAlgorithmSupported()) {
+      nsAutoCString alg;
+      metadata.GetAlgorithm(&alg);
+      NS_ConvertUTF8toUTF16 algUTF16(alg);
+      nsTArray<nsString> params;
+      params.AppendElement(algUTF16);
+      aReporter->AddConsoleReport(
+          nsIScriptError::warningFlag, "Sub-resource Integrity"_ns,
+          nsContentUtils::eSECURITY_PROPERTIES, aSourceFileURI, 0, 0,
+          "UnsupportedHashAlg"_ns,
+          const_cast<const nsTArray<nsString>&>(params));
+    }
+
+    nsAutoCString alg1, alg2;
+    if (MOZ_LOG_TEST(SRILogHelper::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
+    }
+  }
+
+  outMetadata->mIntegrityString = aMetadataList;
+
+  if (MOZ_LOG_TEST(SRILogHelper::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;
+}
+
+//////////////////////////////////////////////////////////////
+//
+//////////////////////////////////////////////////////////////
+SRICheckDataVerifier::SRICheckDataVerifier(const SRIMetadata& aMetadata,
+                                           const nsACString& aSourceFileURI,
+                                           nsIConsoleReportCollector* aReporter)
+    : mCryptoHash(nullptr),
+      mBytesHashed(0),
+      mHashLength(0),
+      mHashType('\0'),
+      mInvalidMetadata(false),
+      mComplete(false) {
+  MOZ_ASSERT(!aMetadata.IsEmpty());  // should be checked by caller
+  MOZ_ASSERT(aReporter);
+
+  if (!aMetadata.IsValid()) {
+    nsTArray<nsString> params;
+    aReporter->AddConsoleReport(
+        nsIScriptError::warningFlag, "Sub-resource Integrity"_ns,
+        nsContentUtils::eSECURITY_PROPERTIES, aSourceFileURI, 0, 0,
+        "NoValidMetadata"_ns, const_cast<const nsTArray<nsString>&>(params));
+    mInvalidMetadata = true;
+    return;  // ignore invalid metadata for forward-compatibility
+  }
+
+  aMetadata.GetHashType(&mHashType, &mHashLength);
+}
+
+nsresult SRICheckDataVerifier::EnsureCryptoHash() {
+  MOZ_ASSERT(!mInvalidMetadata);
+
+  if (mCryptoHash) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsICryptoHash> cryptoHash;
+  nsresult rv = NS_NewCryptoHash(mHashType, getter_AddRefs(cryptoHash));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mCryptoHash = cryptoHash;
+  return NS_OK;
+}
+
+nsresult SRICheckDataVerifier::Update(uint32_t aStringLen,
+                                      const uint8_t* aString) {
+  NS_ENSURE_ARG_POINTER(aString);
+  if (mInvalidMetadata) {
+    return NS_OK;  // ignoring any data updates, see mInvalidMetadata usage
+  }
+
+  nsresult rv;
+  rv = EnsureCryptoHash();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mBytesHashed += aStringLen;
+
+  return mCryptoHash->Update(aString, aStringLen);
+}
+
+nsresult SRICheckDataVerifier::Finish() {
+  if (mInvalidMetadata || mComplete) {
+    return NS_OK;  // already finished or invalid metadata
+  }
+
+  nsresult rv;
+  rv = EnsureCryptoHash();  // we need computed hash even for 0-length data
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = mCryptoHash->Finish(false, mComputedHash);
+  mCryptoHash = nullptr;
+  mComplete = true;
+  return rv;
+}
+
+nsresult SRICheckDataVerifier::VerifyHash(
+    const SRIMetadata& aMetadata, uint32_t aHashIndex,
+    const nsACString& aSourceFileURI, nsIConsoleReportCollector* aReporter) {
+  NS_ENSURE_ARG_POINTER(aReporter);
+
+  nsAutoCString base64Hash;
+  aMetadata.GetHash(aHashIndex, &base64Hash);
+  SRILOG(("SRICheckDataVerifier::VerifyHash, hash[%u]=%s", aHashIndex,
+          base64Hash.get()));
+
+  nsAutoCString binaryHash;
+
+  // We're decoding the supplied hash twice. Trying base64 first.
+  nsresult rv = Base64Decode(base64Hash, binaryHash);
+
+  if (NS_FAILED(rv)) {
+    SRILOG(
+        ("SRICheckDataVerifier::VerifyHash, base64 decoding failed. Trying "
+         "base64url next."));
+    FallibleTArray<uint8_t> decoded;
+    rv = Base64URLDecode(base64Hash, Base64URLDecodePaddingPolicy::Ignore,
+                         decoded);
+    if (NS_FAILED(rv)) {
+      SRILOG(
+          ("SRICheckDataVerifier::VerifyHash, base64url decoding failed too. "
+           "Bailing out."));
+      // if neither succeeded, we can bail out and warn
+      nsTArray<nsString> params;
+      aReporter->AddConsoleReport(
+          nsIScriptError::errorFlag, "Sub-resource Integrity"_ns,
+          nsContentUtils::eSECURITY_PROPERTIES, aSourceFileURI, 0, 0,
+          "InvalidIntegrityBase64"_ns,
+          const_cast<const nsTArray<nsString>&>(params));
+      return NS_ERROR_SRI_CORRUPT;
+    }
+    binaryHash.Assign(reinterpret_cast<const char*>(decoded.Elements()),
+                      decoded.Length());
+    SRILOG(
+        ("SRICheckDataVerifier::VerifyHash, decoded supplied base64url hash "
+         "successfully."));
+  } else {
+    SRILOG(
+        ("SRICheckDataVerifier::VerifyHash, decoded supplied base64 hash "
+         "successfully."));
+  }
+
+  uint32_t hashLength;
+  int8_t hashType;
+  aMetadata.GetHashType(&hashType, &hashLength);
+  if (binaryHash.Length() != hashLength) {
+    SRILOG(
+        ("SRICheckDataVerifier::VerifyHash, supplied base64(url) hash was "
+         "incorrect length after decoding."));
+    nsTArray<nsString> params;
+    aReporter->AddConsoleReport(
+        nsIScriptError::errorFlag, "Sub-resource Integrity"_ns,
+        nsContentUtils::eSECURITY_PROPERTIES, aSourceFileURI, 0, 0,
+        "InvalidIntegrityLength"_ns,
+        const_cast<const nsTArray<nsString>&>(params));
+    return NS_ERROR_SRI_CORRUPT;
+  }
+
+  // the decoded supplied hash should match our computed binary hash.
+  if (!binaryHash.Equals(mComputedHash)) {
+    SRILOG(("SRICheckDataVerifier::VerifyHash, hash[%u] did not match",
+            aHashIndex));
+    return NS_ERROR_SRI_CORRUPT;
+  }
+
+  SRILOG(("SRICheckDataVerifier::VerifyHash, hash[%u] verified successfully",
+          aHashIndex));
+  return NS_OK;
+}
+
+nsresult SRICheckDataVerifier::Verify(const SRIMetadata& aMetadata,
+                                      nsIChannel* aChannel,
+                                      const nsACString& aSourceFileURI,
+                                      nsIConsoleReportCollector* aReporter) {
+  NS_ENSURE_ARG_POINTER(aReporter);
+
+  if (MOZ_LOG_TEST(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug)) {
+    nsAutoCString requestURL;
+    nsCOMPtr<nsIRequest> request = aChannel;
+    request->GetName(requestURL);
+    SRILOG(("SRICheckDataVerifier::Verify, url=%s (length=%zu)",
+            requestURL.get(), mBytesHashed));
+  }
+
+  nsresult rv = Finish();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo();
+  LoadTainting tainting = loadInfo->GetTainting();
+
+  if (NS_FAILED(IsEligible(aChannel, tainting, aSourceFileURI, aReporter))) {
+    return NS_ERROR_SRI_NOT_ELIGIBLE;
+  }
+
+  if (mInvalidMetadata) {
+    return NS_OK;  // ignore invalid metadata for forward-compatibility
+  }
+
+  for (uint32_t i = 0; i < aMetadata.HashCount(); i++) {
+    if (NS_SUCCEEDED(VerifyHash(aMetadata, i, aSourceFileURI, aReporter))) {
+      return NS_OK;  // stop at the first valid hash
+    }
+  }
+
+  nsAutoCString alg;
+  aMetadata.GetAlgorithm(&alg);
+  NS_ConvertUTF8toUTF16 algUTF16(alg);
+  nsAutoCString encodedHash;
+  rv = Base64Encode(mComputedHash, encodedHash);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ConvertUTF8toUTF16 encodedHashUTF16(encodedHash);
+
+  nsTArray<nsString> params;
+  params.AppendElement(algUTF16);
+  params.AppendElement(encodedHashUTF16);
+  aReporter->AddConsoleReport(
+      nsIScriptError::errorFlag, "Sub-resource Integrity"_ns,
+      nsContentUtils::eSECURITY_PROPERTIES, aSourceFileURI, 0, 0,
+      "IntegrityMismatch2"_ns, const_cast<const nsTArray<nsString>&>(params));
+
+  return NS_ERROR_SRI_CORRUPT;
+}
+
+uint32_t SRICheckDataVerifier::DataSummaryLength() {
+  MOZ_ASSERT(!mInvalidMetadata);
+  return sizeof(mHashType) + sizeof(mHashLength) + mHashLength;
+}
+
+uint32_t SRICheckDataVerifier::EmptyDataSummaryLength() {
+  return sizeof(int8_t) + sizeof(uint32_t);
+}
+
+nsresult SRICheckDataVerifier::DataSummaryLength(uint32_t aDataLen,
+                                                 const uint8_t* aData,
+                                                 uint32_t* length) {
+  *length = 0;
+  NS_ENSURE_ARG_POINTER(aData);
+
+  // we expect to always encode an SRI, even if it is empty or incomplete
+  if (aDataLen < EmptyDataSummaryLength()) {
+    SRILOG(
+        ("SRICheckDataVerifier::DataSummaryLength, encoded length[%u] is too "
+         "small",
+         aDataLen));
+    return NS_ERROR_SRI_IMPORT;
+  }
+
+  // decode the content of the buffer
+  size_t offset = sizeof(mHashType);
+  decltype(mHashLength) len = 0;
+  memcpy(&len, &aData[offset], sizeof(mHashLength));
+  offset += sizeof(mHashLength);
+
+  SRIVERBOSE(
+      ("SRICheckDataVerifier::DataSummaryLength, header {%x, %x, %x, %x, %x, "
+       "...}",
+       aData[0], aData[1], aData[2], aData[3], aData[4]));
+
+  if (offset + len > aDataLen) {
+    SRILOG(
+        ("SRICheckDataVerifier::DataSummaryLength, encoded length[%u] overflow "
+         "the buffer size",
+         aDataLen));
+    SRIVERBOSE(("SRICheckDataVerifier::DataSummaryLength, offset[%u], len[%u]",
+                uint32_t(offset), uint32_t(len)));
+    return NS_ERROR_SRI_IMPORT;
+  }
+  *length = uint32_t(offset + len);
+  return NS_OK;
+}
+
+nsresult SRICheckDataVerifier::ImportDataSummary(uint32_t aDataLen,
+                                                 const uint8_t* aData) {
+  MOZ_ASSERT(!mInvalidMetadata);  // mHashType and mHashLength should be valid
+  MOZ_ASSERT(!mCryptoHash);  // EnsureCryptoHash should not have been called
+  NS_ENSURE_ARG_POINTER(aData);
+  if (mInvalidMetadata) {
+    return NS_OK;  // ignoring any data updates, see mInvalidMetadata usage
+  }
+
+  // we expect to always encode an SRI, even if it is empty or incomplete
+  if (aDataLen < DataSummaryLength()) {
+    SRILOG(
+        ("SRICheckDataVerifier::ImportDataSummary, encoded length[%u] is too "
+         "small",
+         aDataLen));
+    return NS_ERROR_SRI_IMPORT;
+  }
+
+  SRIVERBOSE(
+      ("SRICheckDataVerifier::ImportDataSummary, header {%x, %x, %x, %x, %x, "
+       "...}",
+       aData[0], aData[1], aData[2], aData[3], aData[4]));
+
+  // decode the content of the buffer
+  size_t offset = 0;
+  decltype(mHashType) hashType;
+  memcpy(&hashType, &aData[offset], sizeof(mHashType));
+  if (hashType != mHashType) {
+    SRILOG(
+        ("SRICheckDataVerifier::ImportDataSummary, hash type[%d] does not "
+         "match[%d]",
+         hashType, mHashType));
+    return NS_ERROR_SRI_UNEXPECTED_HASH_TYPE;
+  }
+  offset += sizeof(mHashType);
+
+  decltype(mHashLength) hashLength;
+  memcpy(&hashLength, &aData[offset], sizeof(mHashLength));
+  if (hashLength != mHashLength) {
+    SRILOG(
+        ("SRICheckDataVerifier::ImportDataSummary, hash length[%d] does not "
+         "match[%d]",
+         hashLength, mHashLength));
+    return NS_ERROR_SRI_UNEXPECTED_HASH_TYPE;
+  }
+  offset += sizeof(mHashLength);
+
+  // copy the hash to mComputedHash, as-if we had finished streaming the bytes
+  mComputedHash.Assign(reinterpret_cast<const char*>(&aData[offset]),
+                       mHashLength);
+  mCryptoHash = nullptr;
+  mComplete = true;
+  return NS_OK;
+}
+
+nsresult SRICheckDataVerifier::ExportDataSummary(uint32_t aDataLen,
+                                                 uint8_t* aData) {
+  MOZ_ASSERT(!mInvalidMetadata);  // mHashType and mHashLength should be valid
+  MOZ_ASSERT(mComplete);          // finished streaming
+  NS_ENSURE_ARG_POINTER(aData);
+  NS_ENSURE_TRUE(aDataLen >= DataSummaryLength(), NS_ERROR_INVALID_ARG);
+
+  // serialize the hash in the buffer
+  size_t offset = 0;
+  memcpy(&aData[offset], &mHashType, sizeof(mHashType));
+  offset += sizeof(mHashType);
+  memcpy(&aData[offset], &mHashLength, sizeof(mHashLength));
+  offset += sizeof(mHashLength);
+
+  SRIVERBOSE(
+      ("SRICheckDataVerifier::ExportDataSummary, header {%x, %x, %x, %x, %x, "
+       "...}",
+       aData[0], aData[1], aData[2], aData[3], aData[4]));
+
+  // copy the hash to mComputedHash, as-if we had finished streaming the bytes
+  nsCharTraits<char>::copy(reinterpret_cast<char*>(&aData[offset]),
+                           mComputedHash.get(), mHashLength);
+  return NS_OK;
+}
+
+nsresult SRICheckDataVerifier::ExportEmptyDataSummary(uint32_t aDataLen,
+                                                      uint8_t* aData) {
+  NS_ENSURE_ARG_POINTER(aData);
+  NS_ENSURE_TRUE(aDataLen >= EmptyDataSummaryLength(), NS_ERROR_INVALID_ARG);
+
+  // serialize an unknown hash in the buffer, to be able to skip it later
+  size_t offset = 0;
+  memset(&aData[offset], 0, sizeof(mHashType));
+  offset += sizeof(mHashType);
+  memset(&aData[offset], 0, sizeof(mHashLength));
+
+  SRIVERBOSE(
+      ("SRICheckDataVerifier::ExportEmptyDataSummary, header {%x, %x, %x, %x, "
+       "%x, ...}",
+       aData[0], aData[1], aData[2], aData[3], aData[4]));
+
+  return NS_OK;
+}
+
+}  // namespace mozilla::dom