Adding upstream version 110.0.1.upstream/110.0.1upstream

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

1 files changed, 2809 insertions, 0 deletions

diff --git a/security/manager/ssl/nsNSSComponent.cpp b/security/manager/ssl/nsNSSComponent.cpp
new file mode 100644
index 0000000000..5844ffecfd
--- /dev/null
+++ b/security/manager/ssl/nsNSSComponent.cpp
@@ -0,0 +1,2809 @@
+/* -*- Mode: C++; tab-width: 2; 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 "nsNSSComponent.h"
+
+#include "BinaryPath.h"
+#include "CryptoTask.h"
+#include "EnterpriseRoots.h"
+#include "ExtendedValidation.h"
+#include "NSSCertDBTrustDomain.h"
+#include "SSLTokensCache.h"
+#include "ScopedNSSTypes.h"
+#include "SharedSSLState.h"
+#include "cert.h"
+#include "cert_storage/src/cert_storage.h"
+#include "certdb.h"
+#include "mozilla/AppShutdown.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Casting.h"
+#include "mozilla/EndianUtils.h"
+#include "mozilla/FilePreferences.h"
+#include "mozilla/PodOperations.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/ProfilerMarkers.h"
+#include "mozilla/PublicSSL.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticMutex.h"
+#include "mozilla/StaticPrefs_security.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/SyncRunnable.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Unused.h"
+#include "mozilla/Vector.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/net/SocketProcessParent.h"
+#include "mozpkix/pkixnss.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsCRT.h"
+#include "nsClientAuthRemember.h"
+#include "nsComponentManagerUtils.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsICertOverrideService.h"
+#include "nsIFile.h"
+#include "nsILocalFileWin.h"
+#include "nsIOService.h"
+#include "nsIObserverService.h"
+#include "nsIPrompt.h"
+#include "nsIProperties.h"
+#include "nsISerialEventTarget.h"
+#include "nsISiteSecurityService.h"
+#include "nsITimer.h"
+#include "nsITokenPasswordDialogs.h"
+#include "nsIWindowWatcher.h"
+#include "nsIXULRuntime.h"
+#include "nsLiteralString.h"
+#include "nsNSSCertificateDB.h"
+#include "nsNSSHelper.h"
+#include "nsNetCID.h"
+#include "nsPK11TokenDB.h"
+#include "nsPrintfCString.h"
+#include "nsServiceManagerUtils.h"
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+#include "nss.h"
+#include "p12plcy.h"
+#include "pk11pub.h"
+#include "prmem.h"
+#include "secerr.h"
+#include "secmod.h"
+#include "ssl.h"
+#include "sslerr.h"
+#include "sslproto.h"
+
+#if defined(XP_LINUX) && !defined(ANDROID)
+#  include <linux/magic.h>
+#  include <sys/vfs.h>
+#endif
+
+#ifdef XP_WIN
+#  include "mozilla/WindowsVersion.h"
+#  include "nsILocalFileWin.h"
+
+#  include "windows.h"  // this needs to be before the following includes
+#  include "lmcons.h"
+#  include "sddl.h"
+#  include "wincrypt.h"
+#  include "nsIWindowsRegKey.h"
+#endif
+
+using namespace mozilla;
+using namespace mozilla::psm;
+
+LazyLogModule gPIPNSSLog("pipnss");
+
+int nsNSSComponent::mInstanceCount = 0;
+
+// Forward declaration.
+nsresult CommonInit();
+
+// Take an nsIFile and get a UTF-8-encoded c-string representation of the
+// location of that file (encapsulated in an nsACString).
+// This operation is generally to be avoided, except when interacting with
+// third-party or legacy libraries that cannot handle `nsIFile`s (such as NSS).
+// |result| is encoded in UTF-8.
+nsresult FileToCString(const nsCOMPtr<nsIFile>& file, nsACString& result) {
+#ifdef XP_WIN
+  nsAutoString path;
+  nsresult rv = file->GetPath(path);
+  if (NS_SUCCEEDED(rv)) {
+    CopyUTF16toUTF8(path, result);
+  }
+  return rv;
+#else
+  return file->GetNativePath(result);
+#endif
+}
+
+void TruncateFromLastDirectorySeparator(nsCString& path) {
+  static const nsAutoCString kSeparatorString(
+      mozilla::FilePreferences::kPathSeparator);
+  int32_t index = path.RFind(kSeparatorString);
+  if (index == kNotFound) {
+    return;
+  }
+  path.Truncate(index);
+}
+
+bool LoadIPCClientCerts() {
+  // This returns the path to the binary currently running, which in most
+  // cases is "plugin-container".
+  UniqueFreePtr<char> pluginContainerPath(BinaryPath::Get());
+  if (!pluginContainerPath) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("failed to get get plugin-container path"));
+    return false;
+  }
+  nsAutoCString ipcClientCertsDirString(pluginContainerPath.get());
+  // On most platforms, ipcclientcerts is in the same directory as
+  // plugin-container. To obtain the path to that directory, truncate from
+  // the last directory separator.
+  // On macOS, plugin-container is in
+  // Firefox.app/Contents/MacOS/plugin-container.app/Contents/MacOS/,
+  // whereas ipcclientcerts is in Firefox.app/Contents/MacOS/. Consequently,
+  // this truncation from the last directory separator has to happen 4 times
+  // total. Normally this would be done using nsIFile APIs, but due to when
+  // this is initialized in the socket process, those aren't available.
+  TruncateFromLastDirectorySeparator(ipcClientCertsDirString);
+#ifdef XP_MACOSX
+  TruncateFromLastDirectorySeparator(ipcClientCertsDirString);
+  TruncateFromLastDirectorySeparator(ipcClientCertsDirString);
+  TruncateFromLastDirectorySeparator(ipcClientCertsDirString);
+#endif
+  if (!LoadIPCClientCertsModule(ipcClientCertsDirString)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("failed to load ipcclientcerts from '%s'",
+             ipcClientCertsDirString.get()));
+    return false;
+  }
+  return true;
+}
+
+// This function can be called from chrome or content or socket processes
+// to ensure that NSS is initialized.
+bool EnsureNSSInitializedChromeOrContent() {
+  static Atomic<bool> initialized(false);
+
+  if (initialized) {
+    return true;
+  }
+
+  // If this is not the main thread (i.e. probably a worker) then forward this
+  // call to the main thread.
+  if (!NS_IsMainThread()) {
+    nsCOMPtr<nsIThread> mainThread;
+    nsresult rv = NS_GetMainThread(getter_AddRefs(mainThread));
+    if (NS_FAILED(rv)) {
+      return false;
+    }
+
+    // Forward to the main thread synchronously.
+    mozilla::SyncRunnable::DispatchToThread(
+        mainThread,
+        NS_NewRunnableFunction("EnsureNSSInitializedChromeOrContent", []() {
+          EnsureNSSInitializedChromeOrContent();
+        }));
+
+    return initialized;
+  }
+
+  if (XRE_IsParentProcess()) {
+    nsCOMPtr<nsISupports> nss = do_GetService(PSM_COMPONENT_CONTRACTID);
+    if (!nss) {
+      return false;
+    }
+    initialized = true;
+    return true;
+  }
+
+  if (NSS_IsInitialized()) {
+    initialized = true;
+    return true;
+  }
+
+  if (NSS_NoDB_Init(nullptr) != SECSuccess) {
+    return false;
+  }
+
+  if (XRE_IsSocketProcess()) {
+    if (NS_FAILED(CommonInit())) {
+      return false;
+    }
+    // If ipcclientcerts fails to load, client certificate authentication won't
+    // work (if networking is done on the socket process). This is preferable
+    // to stopping the program entirely, so treat this as best-effort.
+    Unused << NS_WARN_IF(!LoadIPCClientCerts());
+    initialized = true;
+    return true;
+  }
+
+  if (NS_FAILED(mozilla::psm::InitializeCipherSuite())) {
+    return false;
+  }
+
+  mozilla::psm::DisableMD5();
+  mozilla::pkix::RegisterErrorTable();
+  initialized = true;
+  return true;
+}
+
+static const uint32_t OCSP_TIMEOUT_MILLISECONDS_SOFT_MAX = 5000;
+static const uint32_t OCSP_TIMEOUT_MILLISECONDS_HARD_MAX = 20000;
+
+void nsNSSComponent::GetRevocationBehaviorFromPrefs(
+    /*out*/ CertVerifier::OcspDownloadConfig* odc,
+    /*out*/ CertVerifier::OcspStrictConfig* osc,
+    /*out*/ uint32_t* certShortLifetimeInDays,
+    /*out*/ TimeDuration& softTimeout,
+    /*out*/ TimeDuration& hardTimeout) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(odc);
+  MOZ_ASSERT(osc);
+  MOZ_ASSERT(certShortLifetimeInDays);
+
+  // 0 = disabled
+  // 1 = enabled for everything (default)
+  // 2 = enabled for EV certificates only
+  uint32_t ocspLevel = StaticPrefs::security_OCSP_enabled();
+  switch (ocspLevel) {
+    case 0:
+      *odc = CertVerifier::ocspOff;
+      break;
+    case 2:
+      *odc = CertVerifier::ocspEVOnly;
+      break;
+    default:
+      *odc = CertVerifier::ocspOn;
+      break;
+  }
+
+  *osc = StaticPrefs::security_OCSP_require() ? CertVerifier::ocspStrict
+                                              : CertVerifier::ocspRelaxed;
+
+  *certShortLifetimeInDays =
+      StaticPrefs::security_pki_cert_short_lifetime_in_days();
+
+  uint32_t softTimeoutMillis =
+      StaticPrefs::security_OCSP_timeoutMilliseconds_soft();
+  softTimeoutMillis =
+      std::min(softTimeoutMillis, OCSP_TIMEOUT_MILLISECONDS_SOFT_MAX);
+  softTimeout = TimeDuration::FromMilliseconds(softTimeoutMillis);
+
+  uint32_t hardTimeoutMillis =
+      StaticPrefs::security_OCSP_timeoutMilliseconds_hard();
+  hardTimeoutMillis =
+      std::min(hardTimeoutMillis, OCSP_TIMEOUT_MILLISECONDS_HARD_MAX);
+  hardTimeout = TimeDuration::FromMilliseconds(hardTimeoutMillis);
+}
+
+nsNSSComponent::nsNSSComponent()
+    : mLoadableCertsLoadedMonitor("nsNSSComponent.mLoadableCertsLoadedMonitor"),
+      mLoadableCertsLoaded(false),
+      mLoadableCertsLoadedResult(NS_ERROR_FAILURE),
+      mMutex("nsNSSComponent.mMutex"),
+      mMitmDetecionEnabled(false) {
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("nsNSSComponent::ctor\n"));
+  MOZ_RELEASE_ASSERT(NS_IsMainThread());
+
+  MOZ_ASSERT(mInstanceCount == 0,
+             "nsNSSComponent is a singleton, but instantiated multiple times!");
+  ++mInstanceCount;
+}
+
+nsNSSComponent::~nsNSSComponent() {
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("nsNSSComponent::dtor\n"));
+  MOZ_RELEASE_ASSERT(NS_IsMainThread());
+
+  // All cleanup code requiring services needs to happen in xpcom_shutdown
+
+  PrepareForShutdown();
+  SharedSSLState::GlobalCleanup();
+  --mInstanceCount;
+
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("nsNSSComponent::dtor finished\n"));
+}
+
+#ifdef XP_WIN
+static bool GetUserSid(nsAString& sidString) {
+  // UNLEN is the maximum user name length (see Lmcons.h). +1 for the null
+  // terminator.
+  WCHAR lpAccountName[UNLEN + 1];
+  DWORD lcAccountName = sizeof(lpAccountName) / sizeof(lpAccountName[0]);
+  BOOL success = GetUserName(lpAccountName, &lcAccountName);
+  if (!success) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("GetUserName failed"));
+    return false;
+  }
+  char sid_buffer[SECURITY_MAX_SID_SIZE];
+  SID* sid = BitwiseCast<SID*, char*>(sid_buffer);
+  DWORD cbSid = ArrayLength(sid_buffer);
+  SID_NAME_USE eUse;
+  // There doesn't appear to be a defined maximum length for the domain name
+  // here. To deal with this, we start with a reasonable buffer length and
+  // see if that works. If it fails and the error indicates insufficient length,
+  // we use the indicated required length and try again.
+  DWORD cchReferencedDomainName = 128;
+  auto ReferencedDomainName(MakeUnique<WCHAR[]>(cchReferencedDomainName));
+  success = LookupAccountName(nullptr, lpAccountName, sid, &cbSid,
+                              ReferencedDomainName.get(),
+                              &cchReferencedDomainName, &eUse);
+  if (!success && GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("LookupAccountName failed"));
+    return false;
+  }
+  if (!success) {
+    ReferencedDomainName = MakeUnique<WCHAR[]>(cchReferencedDomainName);
+    success = LookupAccountName(nullptr, lpAccountName, sid, &cbSid,
+                                ReferencedDomainName.get(),
+                                &cchReferencedDomainName, &eUse);
+  }
+  if (!success) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("LookupAccountName failed"));
+    return false;
+  }
+  LPTSTR StringSid;
+  success = ConvertSidToStringSid(sid, &StringSid);
+  if (!success) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("ConvertSidToStringSid failed"));
+    return false;
+  }
+  sidString.Assign(StringSid);
+  LocalFree(StringSid);
+  return true;
+}
+
+// This is a specialized helper function to read the value of a registry key
+// that might not be present. If it is present, returns (via the output
+// parameter) its value. Otherwise, returns the given default value.
+// This function handles one level of nesting. That is, if the desired value
+// is actually in a direct child of the given registry key (where the child
+// and/or the value being sought may not actually be present), this function
+// will handle that. In the normal case, though, optionalChildName will be
+// null.
+static nsresult ReadRegKeyValueWithDefault(nsCOMPtr<nsIWindowsRegKey> regKey,
+                                           uint32_t flags,
+                                           const wchar_t* optionalChildName,
+                                           const wchar_t* valueName,
+                                           uint32_t defaultValue,
+                                           uint32_t& valueOut) {
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("ReadRegKeyValueWithDefault"));
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+          ("attempting to read '%S%s%S' with default '%u'",
+           optionalChildName ? optionalChildName : L"",
+           optionalChildName ? "\\" : "", valueName, defaultValue));
+  if (optionalChildName) {
+    nsDependentString childNameString(optionalChildName);
+    bool hasChild;
+    nsresult rv = regKey->HasChild(childNameString, &hasChild);
+    if (NS_FAILED(rv)) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+              ("failed to determine if child key is present"));
+      return rv;
+    }
+    if (!hasChild) {
+      valueOut = defaultValue;
+      return NS_OK;
+    }
+    nsCOMPtr<nsIWindowsRegKey> childRegKey;
+    rv = regKey->OpenChild(childNameString, flags, getter_AddRefs(childRegKey));
+    if (NS_FAILED(rv)) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("couldn't open child key"));
+      return rv;
+    }
+    return ReadRegKeyValueWithDefault(childRegKey, flags, nullptr, valueName,
+                                      defaultValue, valueOut);
+  }
+  nsDependentString valueNameString(valueName);
+  bool hasValue;
+  nsresult rv = regKey->HasValue(valueNameString, &hasValue);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("failed to determine if value is present"));
+    return rv;
+  }
+  if (!hasValue) {
+    valueOut = defaultValue;
+    return NS_OK;
+  }
+  rv = regKey->ReadIntValue(valueNameString, &valueOut);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("failed to read value"));
+    return rv;
+  }
+  return NS_OK;
+}
+
+static nsresult AccountHasFamilySafetyEnabled(bool& enabled) {
+  enabled = false;
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("AccountHasFamilySafetyEnabled?"));
+  nsCOMPtr<nsIWindowsRegKey> parentalControlsKey(
+      do_CreateInstance("@mozilla.org/windows-registry-key;1"));
+  if (!parentalControlsKey) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("couldn't create nsIWindowsRegKey"));
+    return NS_ERROR_FAILURE;
+  }
+  uint32_t flags = nsIWindowsRegKey::ACCESS_READ | nsIWindowsRegKey::WOW64_64;
+  constexpr auto familySafetyPath =
+      u"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Parental Controls"_ns;
+  nsresult rv = parentalControlsKey->Open(
+      nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE, familySafetyPath, flags);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("couldn't open parentalControlsKey"));
+    return rv;
+  }
+  constexpr auto usersString = u"Users"_ns;
+  bool hasUsers;
+  rv = parentalControlsKey->HasChild(usersString, &hasUsers);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("HasChild(Users) failed"));
+    return rv;
+  }
+  if (!hasUsers) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("Users subkey not present - Parental Controls not enabled"));
+    return NS_OK;
+  }
+  nsCOMPtr<nsIWindowsRegKey> usersKey;
+  rv = parentalControlsKey->OpenChild(usersString, flags,
+                                      getter_AddRefs(usersKey));
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("failed to open Users subkey"));
+    return rv;
+  }
+  nsAutoString sid;
+  if (!GetUserSid(sid)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("couldn't get sid"));
+    return NS_ERROR_FAILURE;
+  }
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+          ("our sid is '%S'", static_cast<const wchar_t*>(sid.get())));
+  bool hasSid;
+  rv = usersKey->HasChild(sid, &hasSid);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("HasChild(sid) failed"));
+    return rv;
+  }
+  if (!hasSid) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("sid not present in Family Safety Users"));
+    return NS_OK;
+  }
+  nsCOMPtr<nsIWindowsRegKey> sidKey;
+  rv = usersKey->OpenChild(sid, flags, getter_AddRefs(sidKey));
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("couldn't open sid key"));
+    return rv;
+  }
+  // There are three keys we're interested in: "Parental Controls On",
+  // "Logging Required", and "Web\\Filter On". These keys will have value 0
+  // or 1, indicating a particular feature is disabled or enabled,
+  // respectively. So, if "Parental Controls On" is not 1, Family Safety is
+  // disabled and we don't care about anything else. If both "Logging
+  // Required" and "Web\\Filter On" are 0, the proxy will not be running,
+  // so for our purposes we can consider Family Safety disabled in that
+  // case.
+  // By default, "Logging Required" is 1 and "Web\\Filter On" is 0,
+  // reflecting the initial settings when Family Safety is enabled for an
+  // account for the first time, However, these sub-keys are not created
+  // unless they are switched away from the default value.
+  uint32_t parentalControlsOn;
+  rv = sidKey->ReadIntValue(u"Parental Controls On"_ns, &parentalControlsOn);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("couldn't read Parental Controls On"));
+    return rv;
+  }
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+          ("Parental Controls On: %u", parentalControlsOn));
+  if (parentalControlsOn != 1) {
+    return NS_OK;
+  }
+  uint32_t loggingRequired;
+  rv = ReadRegKeyValueWithDefault(sidKey, flags, nullptr, L"Logging Required",
+                                  1, loggingRequired);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("failed to read value of Logging Required"));
+    return rv;
+  }
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+          ("Logging Required: %u", loggingRequired));
+  uint32_t webFilterOn;
+  rv = ReadRegKeyValueWithDefault(sidKey, flags, L"Web", L"Filter On", 0,
+                                  webFilterOn);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("failed to read value of Web\\Filter On"));
+    return rv;
+  }
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("Web\\Filter On: %u", webFilterOn));
+  enabled = loggingRequired == 1 || webFilterOn == 1;
+  return NS_OK;
+}
+#endif  // XP_WIN
+
+bool nsNSSComponent::ShouldEnableEnterpriseRootsForFamilySafety(
+    uint32_t familySafetyMode) {
+#ifdef XP_WIN
+  if (!(IsWin8Point1OrLater() && !IsWin10OrLater())) {
+    return false;
+  }
+  if (familySafetyMode != 2) {
+    return false;
+  }
+  bool familySafetyEnabled;
+  nsresult rv = AccountHasFamilySafetyEnabled(familySafetyEnabled);
+  if (NS_FAILED(rv)) {
+    return false;
+  }
+  return familySafetyEnabled;
+#else
+  return false;
+#endif  // XP_WIN
+}
+
+void nsNSSComponent::UnloadEnterpriseRoots() {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!NS_IsMainThread()) {
+    return;
+  }
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("UnloadEnterpriseRoots"));
+  MutexAutoLock lock(mMutex);
+  mEnterpriseCerts.clear();
+  setValidationOptions(false, lock);
+  ClearSSLExternalAndInternalSessionCache();
+}
+
+class BackgroundImportEnterpriseCertsTask final : public CryptoTask {
+ public:
+  explicit BackgroundImportEnterpriseCertsTask(nsNSSComponent* nssComponent)
+      : mNSSComponent(nssComponent) {}
+
+ private:
+  virtual nsresult CalculateResult() override {
+    mNSSComponent->ImportEnterpriseRoots();
+    mNSSComponent->UpdateCertVerifierWithEnterpriseRoots();
+    return NS_OK;
+  }
+
+  virtual void CallCallback(nsresult rv) override {
+    nsCOMPtr<nsIObserverService> observerService =
+        mozilla::services::GetObserverService();
+    if (observerService) {
+      observerService->NotifyObservers(nullptr, "psm:enterprise-certs-imported",
+                                       nullptr);
+    }
+  }
+
+  RefPtr<nsNSSComponent> mNSSComponent;
+};
+
+void nsNSSComponent::MaybeImportEnterpriseRoots() {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!NS_IsMainThread()) {
+    return;
+  }
+  bool importEnterpriseRoots = StaticPrefs::security_enterprise_roots_enabled();
+  uint32_t familySafetyMode = StaticPrefs::security_family_safety_mode();
+  // If we've been configured to detect the Family Safety TLS interception
+  // feature, see if it's enabled. If so, we want to import enterprise roots.
+  if (ShouldEnableEnterpriseRootsForFamilySafety(familySafetyMode)) {
+    importEnterpriseRoots = true;
+  }
+  if (importEnterpriseRoots) {
+    RefPtr<BackgroundImportEnterpriseCertsTask> task =
+        new BackgroundImportEnterpriseCertsTask(this);
+    Unused << task->Dispatch();
+  }
+}
+
+void nsNSSComponent::ImportEnterpriseRoots() {
+  MOZ_ASSERT(!NS_IsMainThread());
+  if (NS_IsMainThread()) {
+    return;
+  }
+
+  Vector<EnterpriseCert> enterpriseCerts;
+  nsresult rv = GatherEnterpriseCerts(enterpriseCerts);
+  if (NS_SUCCEEDED(rv)) {
+    MutexAutoLock lock(mMutex);
+    mEnterpriseCerts = std::move(enterpriseCerts);
+  } else {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("failed gathering enterprise roots"));
+  }
+}
+
+nsresult nsNSSComponent::CommonGetEnterpriseCerts(
+    nsTArray<nsTArray<uint8_t>>& enterpriseCerts, bool getRoots) {
+  nsresult rv = BlockUntilLoadableCertsLoaded();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  MutexAutoLock nsNSSComponentLock(mMutex);
+  enterpriseCerts.Clear();
+  for (const auto& cert : mEnterpriseCerts) {
+    nsTArray<uint8_t> certCopy;
+    // mEnterpriseCerts includes both roots and intermediates.
+    if (cert.GetIsRoot() == getRoots) {
+      nsresult rv = cert.CopyBytes(certCopy);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+      // XXX(Bug 1631371) Check if this should use a fallible operation as it
+      // pretended earlier.
+      enterpriseCerts.AppendElement(std::move(certCopy));
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNSSComponent::GetEnterpriseRoots(
+    nsTArray<nsTArray<uint8_t>>& enterpriseRoots) {
+  return CommonGetEnterpriseCerts(enterpriseRoots, true);
+}
+
+NS_IMETHODIMP
+nsNSSComponent::GetEnterpriseIntermediates(
+    nsTArray<nsTArray<uint8_t>>& enterpriseIntermediates) {
+  return CommonGetEnterpriseCerts(enterpriseIntermediates, false);
+}
+
+NS_IMETHODIMP
+nsNSSComponent::AddEnterpriseIntermediate(
+    const nsTArray<uint8_t>& intermediateBytes) {
+  nsresult rv = BlockUntilLoadableCertsLoaded();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  EnterpriseCert intermediate;
+  rv = intermediate.Init(intermediateBytes.Elements(),
+                         intermediateBytes.Length(), false);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  {
+    MutexAutoLock nsNSSComponentLock(mMutex);
+    if (!mEnterpriseCerts.append(std::move(intermediate))) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+
+  UpdateCertVerifierWithEnterpriseRoots();
+  return NS_OK;
+}
+
+class LoadLoadableCertsTask final : public Runnable {
+ public:
+  LoadLoadableCertsTask(nsNSSComponent* nssComponent,
+                        bool importEnterpriseRoots, uint32_t familySafetyMode,
+                        Vector<nsCString>&& possibleLoadableRootsLocations,
+                        Maybe<nsCString>&& osClientCertsModuleLocation)
+      : Runnable("LoadLoadableCertsTask"),
+        mNSSComponent(nssComponent),
+        mImportEnterpriseRoots(importEnterpriseRoots),
+        mFamilySafetyMode(familySafetyMode),
+        mPossibleLoadableRootsLocations(
+            std::move(possibleLoadableRootsLocations)),
+        mOSClientCertsModuleLocation(std::move(osClientCertsModuleLocation)) {
+    MOZ_ASSERT(nssComponent);
+  }
+
+  ~LoadLoadableCertsTask() = default;
+
+  nsresult Dispatch();
+
+ private:
+  NS_IMETHOD Run() override;
+  nsresult LoadLoadableRoots();
+  RefPtr<nsNSSComponent> mNSSComponent;
+  bool mImportEnterpriseRoots;
+  uint32_t mFamilySafetyMode;
+  Vector<nsCString> mPossibleLoadableRootsLocations;  // encoded in UTF-8
+  Maybe<nsCString> mOSClientCertsModuleLocation;      // encoded in UTF-8
+};
+
+nsresult LoadLoadableCertsTask::Dispatch() {
+  // The stream transport service (note: not the socket transport service) can
+  // be used to perform background tasks or I/O that would otherwise block the
+  // main thread.
+  nsCOMPtr<nsIEventTarget> target(
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID));
+  if (!target) {
+    return NS_ERROR_FAILURE;
+  }
+  return target->Dispatch(this, NS_DISPATCH_NORMAL);
+}
+
+NS_IMETHODIMP
+LoadLoadableCertsTask::Run() {
+  Telemetry::AutoScalarTimer<Telemetry::ScalarID::NETWORKING_LOADING_CERTS_TASK>
+      timer;
+
+  nsresult loadLoadableRootsResult = LoadLoadableRoots();
+  if (NS_WARN_IF(NS_FAILED(loadLoadableRootsResult))) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Error, ("LoadLoadableRoots failed"));
+    // We don't return loadLoadableRootsResult here because then
+    // BlockUntilLoadableCertsLoaded will just wait forever. Instead we'll save
+    // its value (below) so we can inform code that relies on the roots module
+    // being present that loading it failed.
+  }
+
+  // Loading EV information will only succeed if we've successfully loaded the
+  // loadable roots module.
+  if (NS_SUCCEEDED(loadLoadableRootsResult)) {
+    if (NS_FAILED(LoadExtendedValidationInfo())) {
+      // This isn't a show-stopper in the same way that failing to load the
+      // roots module is.
+      MOZ_LOG(gPIPNSSLog, LogLevel::Error, ("failed to load EV info"));
+    }
+  }
+
+  // If we've been configured to detect the Family Safety TLS interception
+  // feature, see if it's enabled. If so, we want to import enterprise roots.
+  if (mNSSComponent->ShouldEnableEnterpriseRootsForFamilySafety(
+          mFamilySafetyMode)) {
+    mImportEnterpriseRoots = true;
+  }
+  if (mImportEnterpriseRoots) {
+    mNSSComponent->ImportEnterpriseRoots();
+    mNSSComponent->UpdateCertVerifierWithEnterpriseRoots();
+  }
+  if (mOSClientCertsModuleLocation.isSome()) {
+    bool success = LoadOSClientCertsModule(*mOSClientCertsModuleLocation);
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("loading OS client certs module %s",
+             success ? "succeeded" : "failed"));
+  }
+  {
+    MonitorAutoLock rootsLoadedLock(mNSSComponent->mLoadableCertsLoadedMonitor);
+    mNSSComponent->mLoadableCertsLoaded = true;
+    // Cache the result of LoadLoadableRoots so BlockUntilLoadableCertsLoaded
+    // can return it to all callers later (we use that particular result because
+    // if that operation fails, it's unlikely that any TLS connection will
+    // succeed whereas the browser may still be able to operate if the other
+    // tasks fail).
+    mNSSComponent->mLoadableCertsLoadedResult = loadLoadableRootsResult;
+    mNSSComponent->mLoadableCertsLoadedMonitor.NotifyAll();
+  }
+  return NS_OK;
+}
+
+// Returns by reference the path to the desired directory, based on the current
+// settings in the directory service.
+// |result| is encoded in UTF-8.
+static nsresult GetDirectoryPath(const char* directoryKey, nsCString& result) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIProperties> directoryService(
+      do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID));
+  if (!directoryService) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("could not get directory service"));
+    return NS_ERROR_FAILURE;
+  }
+  nsCOMPtr<nsIFile> directory;
+  nsresult rv = directoryService->Get(directoryKey, NS_GET_IID(nsIFile),
+                                      getter_AddRefs(directory));
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("could not get '%s' from directory service", directoryKey));
+    return rv;
+  }
+  return FileToCString(directory, result);
+}
+
+class BackgroundLoadOSClientCertsModuleTask final : public CryptoTask {
+ public:
+  explicit BackgroundLoadOSClientCertsModuleTask(const nsCString&& libraryDir)
+      : mLibraryDir(std::move(libraryDir)) {}
+
+ private:
+  virtual nsresult CalculateResult() override {
+    bool success = LoadOSClientCertsModule(mLibraryDir);
+    return success ? NS_OK : NS_ERROR_FAILURE;
+  }
+
+  virtual void CallCallback(nsresult rv) override {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("loading OS client certs module %s",
+             NS_SUCCEEDED(rv) ? "succeeded" : "failed"));
+    nsCOMPtr<nsIObserverService> observerService =
+        mozilla::services::GetObserverService();
+    if (observerService) {
+      observerService->NotifyObservers(
+          nullptr, "psm:load-os-client-certs-module-task-ran", nullptr);
+    }
+  }
+
+  nsCString mLibraryDir;
+};
+
+void AsyncLoadOrUnloadOSClientCertsModule(bool load) {
+  if (load) {
+    nsCString libraryDir;
+    nsresult rv = GetDirectoryPath(NS_GRE_BIN_DIR, libraryDir);
+    if (NS_FAILED(rv)) {
+      return;
+    }
+    RefPtr<BackgroundLoadOSClientCertsModuleTask> task =
+        new BackgroundLoadOSClientCertsModuleTask(std::move(libraryDir));
+    Unused << task->Dispatch();
+  } else {
+    UniqueSECMODModule osClientCertsModule(
+        SECMOD_FindModule(kOSClientCertsModuleName));
+    if (osClientCertsModule) {
+      SECMOD_UnloadUserModule(osClientCertsModule.get());
+    }
+  }
+}
+
+NS_IMETHODIMP
+nsNSSComponent::HasActiveSmartCards(bool* result) {
+  NS_ENSURE_ARG_POINTER(result);
+
+  BlockUntilLoadableCertsLoaded();
+
+#ifndef MOZ_NO_SMART_CARDS
+  AutoSECMODListReadLock secmodLock;
+  SECMODModuleList* list = SECMOD_GetDefaultModuleList();
+  while (list) {
+    SECMODModule* module = list->module;
+    if (SECMOD_LockedModuleHasRemovableSlots(module)) {
+      *result = true;
+      return NS_OK;
+    }
+    for (int i = 0; i < module->slotCount; i++) {
+      if (!PK11_IsFriendly(module->slots[i])) {
+        *result = true;
+        return NS_OK;
+      }
+    }
+    list = list->next;
+  }
+#endif
+  *result = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNSSComponent::HasUserCertsInstalled(bool* result) {
+  NS_ENSURE_ARG_POINTER(result);
+
+  // FindClientCertificatesWithPrivateKeys won't ever return an empty list, so
+  // all we need to do is check if this is null or not.
+  UniqueCERTCertList certList(FindClientCertificatesWithPrivateKeys());
+  *result = !!certList;
+
+  return NS_OK;
+}
+
+nsresult nsNSSComponent::BlockUntilLoadableCertsLoaded() {
+  MonitorAutoLock rootsLoadedLock(mLoadableCertsLoadedMonitor);
+  while (!mLoadableCertsLoaded) {
+    rootsLoadedLock.Wait();
+  }
+  MOZ_ASSERT(mLoadableCertsLoaded);
+
+  return mLoadableCertsLoadedResult;
+}
+
+#ifndef MOZ_NO_SMART_CARDS
+static StaticMutex sCheckForSmartCardChangesMutex MOZ_UNANNOTATED;
+static TimeStamp sLastCheckedForSmartCardChanges = TimeStamp::Now();
+#endif
+
+nsresult nsNSSComponent::CheckForSmartCardChanges() {
+#ifndef MOZ_NO_SMART_CARDS
+  {
+    StaticMutexAutoLock lock(sCheckForSmartCardChangesMutex);
+    // Do this at most once every 3 seconds.
+    TimeStamp now = TimeStamp::Now();
+    if (now - sLastCheckedForSmartCardChanges <
+        TimeDuration::FromSeconds(3.0)) {
+      return NS_OK;
+    }
+    sLastCheckedForSmartCardChanges = now;
+  }
+
+  // SECMOD_UpdateSlotList attempts to acquire the list lock as well, so we
+  // have to do this in three steps.
+  Vector<UniqueSECMODModule> modulesWithRemovableSlots;
+  {
+    AutoSECMODListReadLock secmodLock;
+    SECMODModuleList* list = SECMOD_GetDefaultModuleList();
+    while (list) {
+      if (SECMOD_LockedModuleHasRemovableSlots(list->module)) {
+        UniqueSECMODModule module(SECMOD_ReferenceModule(list->module));
+        if (!modulesWithRemovableSlots.append(std::move(module))) {
+          return NS_ERROR_OUT_OF_MEMORY;
+        }
+      }
+      list = list->next;
+    }
+  }
+  for (auto& module : modulesWithRemovableSlots) {
+    // Best-effort.
+    Unused << SECMOD_UpdateSlotList(module.get());
+  }
+  AutoSECMODListReadLock secmodLock;
+  for (auto& module : modulesWithRemovableSlots) {
+    for (int i = 0; i < module->slotCount; i++) {
+      // We actually don't care about the return value here - we just need to
+      // call this to get NSS to update its view of this slot.
+      Unused << PK11_IsPresent(module->slots[i]);
+    }
+  }
+#endif
+
+  return NS_OK;
+}
+
+// Returns by reference the path to the directory containing the file that has
+// been loaded as MOZ_DLL_PREFIX nss3 MOZ_DLL_SUFFIX.
+// |result| is encoded in UTF-8.
+static nsresult GetNSS3Directory(nsCString& result) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  UniquePRString nss3Path(
+      PR_GetLibraryFilePathname(MOZ_DLL_PREFIX "nss3" MOZ_DLL_SUFFIX,
+                                reinterpret_cast<PRFuncPtr>(NSS_Initialize)));
+  if (!nss3Path) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("nss not loaded?"));
+    return NS_ERROR_FAILURE;
+  }
+  nsCOMPtr<nsIFile> nss3File(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID));
+  if (!nss3File) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("couldn't create a file?"));
+    return NS_ERROR_FAILURE;
+  }
+  nsAutoCString nss3PathAsString(nss3Path.get());
+  nsresult rv = nss3File->InitWithNativePath(nss3PathAsString);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("couldn't initialize file with path '%s'", nss3Path.get()));
+    return rv;
+  }
+  nsCOMPtr<nsIFile> nss3Directory;
+  rv = nss3File->GetParent(getter_AddRefs(nss3Directory));
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("couldn't get parent directory?"));
+    return rv;
+  }
+  return FileToCString(nss3Directory, result);
+}
+
+// The loadable roots library is probably in the same directory we loaded the
+// NSS shared library from, but in some cases it may be elsewhere. This function
+// enumerates and returns the possible locations as nsCStrings.
+// |possibleLoadableRootsLocations| is encoded in UTF-8.
+static nsresult ListPossibleLoadableRootsLocations(
+    Vector<nsCString>& possibleLoadableRootsLocations) {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!NS_IsMainThread()) {
+    return NS_ERROR_NOT_SAME_THREAD;
+  }
+
+  // First try in the directory where we've already loaded
+  // MOZ_DLL_PREFIX nss3 MOZ_DLL_SUFFIX, since that's likely to be correct.
+  nsAutoCString nss3Dir;
+  nsresult rv = GetNSS3Directory(nss3Dir);
+  if (NS_SUCCEEDED(rv)) {
+    if (!possibleLoadableRootsLocations.append(std::move(nss3Dir))) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  } else {
+    // For some reason this fails on android. In any case, we should try with
+    // the other potential locations we have.
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("could not determine where nss was loaded from"));
+  }
+  nsAutoCString currentProcessDir;
+  rv = GetDirectoryPath(NS_XPCOM_CURRENT_PROCESS_DIR, currentProcessDir);
+  if (NS_SUCCEEDED(rv)) {
+    if (!possibleLoadableRootsLocations.append(std::move(currentProcessDir))) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  } else {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("could not get current process directory"));
+  }
+  nsAutoCString greDir;
+  rv = GetDirectoryPath(NS_GRE_DIR, greDir);
+  if (NS_SUCCEEDED(rv)) {
+    if (!possibleLoadableRootsLocations.append(std::move(greDir))) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  } else {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("could not get gre directory"));
+  }
+  // As a last resort, this will cause the library loading code to use the OS'
+  // default library search path.
+  nsAutoCString emptyString;
+  if (!possibleLoadableRootsLocations.append(std::move(emptyString))) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  return NS_OK;
+}
+
+nsresult LoadLoadableCertsTask::LoadLoadableRoots() {
+  for (const auto& possibleLocation : mPossibleLoadableRootsLocations) {
+    if (mozilla::psm::LoadLoadableRoots(possibleLocation)) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+              ("loaded CKBI from %s", possibleLocation.get()));
+      return NS_OK;
+    }
+  }
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("could not load loadable roots"));
+  return NS_ERROR_FAILURE;
+}
+
+// Table of pref names and SSL cipher ID
+typedef struct {
+  const char* pref;
+  int32_t id;
+  bool (*prefGetter)();
+} CipherPref;
+
+// Update the switch statement in AccumulateCipherSuite in nsNSSCallbacks.cpp
+// when you add/remove cipher suites here.
+static const CipherPref sCipherPrefs[] = {
+    {"security.ssl3.ecdhe_rsa_aes_128_gcm_sha256",
+     TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+     StaticPrefs::security_ssl3_ecdhe_rsa_aes_128_gcm_sha256},
+    {"security.ssl3.ecdhe_ecdsa_aes_128_gcm_sha256",
+     TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+     StaticPrefs::security_ssl3_ecdhe_ecdsa_aes_128_gcm_sha256},
+    {"security.ssl3.ecdhe_ecdsa_chacha20_poly1305_sha256",
+     TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
+     StaticPrefs::security_ssl3_ecdhe_ecdsa_chacha20_poly1305_sha256},
+    {"security.ssl3.ecdhe_rsa_chacha20_poly1305_sha256",
+     TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+     StaticPrefs::security_ssl3_ecdhe_rsa_chacha20_poly1305_sha256},
+    {"security.ssl3.ecdhe_ecdsa_aes_256_gcm_sha384",
+     TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+     StaticPrefs::security_ssl3_ecdhe_ecdsa_aes_256_gcm_sha384},
+    {"security.ssl3.ecdhe_rsa_aes_256_gcm_sha384",
+     TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+     StaticPrefs::security_ssl3_ecdhe_rsa_aes_256_gcm_sha384},
+    {"security.ssl3.ecdhe_rsa_aes_128_sha", TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
+     StaticPrefs::security_ssl3_ecdhe_rsa_aes_128_sha},
+    {"security.ssl3.ecdhe_ecdsa_aes_128_sha",
+     TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
+     StaticPrefs::security_ssl3_ecdhe_ecdsa_aes_128_sha},
+    {"security.ssl3.ecdhe_rsa_aes_256_sha", TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
+     StaticPrefs::security_ssl3_ecdhe_rsa_aes_256_sha},
+    {"security.ssl3.ecdhe_ecdsa_aes_256_sha",
+     TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
+     StaticPrefs::security_ssl3_ecdhe_ecdsa_aes_256_sha},
+    {"security.ssl3.dhe_rsa_aes_128_sha", TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
+     StaticPrefs::security_ssl3_dhe_rsa_aes_128_sha},
+    {"security.ssl3.dhe_rsa_aes_256_sha", TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
+     StaticPrefs::security_ssl3_dhe_rsa_aes_256_sha},
+    {"security.tls13.aes_128_gcm_sha256", TLS_AES_128_GCM_SHA256,
+     StaticPrefs::security_tls13_aes_128_gcm_sha256},
+    {"security.tls13.chacha20_poly1305_sha256", TLS_CHACHA20_POLY1305_SHA256,
+     StaticPrefs::security_tls13_chacha20_poly1305_sha256},
+    {"security.tls13.aes_256_gcm_sha384", TLS_AES_256_GCM_SHA384,
+     StaticPrefs::security_tls13_aes_256_gcm_sha384},
+    {"security.ssl3.rsa_aes_128_gcm_sha256", TLS_RSA_WITH_AES_128_GCM_SHA256,
+     StaticPrefs::security_ssl3_rsa_aes_128_gcm_sha256},
+    {"security.ssl3.rsa_aes_256_gcm_sha384", TLS_RSA_WITH_AES_256_GCM_SHA384,
+     StaticPrefs::security_ssl3_rsa_aes_256_gcm_sha384},
+    {"security.ssl3.rsa_aes_128_sha", TLS_RSA_WITH_AES_128_CBC_SHA,
+     StaticPrefs::security_ssl3_rsa_aes_128_sha},
+    {"security.ssl3.rsa_aes_256_sha", TLS_RSA_WITH_AES_256_CBC_SHA,
+     StaticPrefs::security_ssl3_rsa_aes_256_sha},
+};
+
+// These ciphersuites can only be enabled if deprecated versions of TLS are
+// also enabled (via the preference "security.tls.version.enable-deprecated").
+static const CipherPref sDeprecatedTLS1CipherPrefs[] = {
+    {"security.ssl3.deprecated.rsa_des_ede3_sha", TLS_RSA_WITH_3DES_EDE_CBC_SHA,
+     StaticPrefs::security_ssl3_deprecated_rsa_des_ede3_sha},
+};
+
+// This function will convert from pref values like 1, 2, ...
+// to the internal values of SSL_LIBRARY_VERSION_TLS_1_0,
+// SSL_LIBRARY_VERSION_TLS_1_1, ...
+/*static*/
+void nsNSSComponent::FillTLSVersionRange(SSLVersionRange& rangeOut,
+                                         uint32_t minFromPrefs,
+                                         uint32_t maxFromPrefs,
+                                         SSLVersionRange defaults) {
+  rangeOut = defaults;
+  // determine what versions are supported
+  SSLVersionRange supported;
+  if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported) !=
+      SECSuccess) {
+    return;
+  }
+
+  // Clip the defaults by what NSS actually supports to enable
+  // working with a system NSS with different ranges.
+  rangeOut.min = std::max(rangeOut.min, supported.min);
+  rangeOut.max = std::min(rangeOut.max, supported.max);
+
+  // convert min/maxFromPrefs to the internal representation
+  minFromPrefs += SSL_LIBRARY_VERSION_3_0;
+  maxFromPrefs += SSL_LIBRARY_VERSION_3_0;
+  // if min/maxFromPrefs are invalid, use defaults
+  if (minFromPrefs > maxFromPrefs || minFromPrefs < supported.min ||
+      maxFromPrefs > supported.max ||
+      minFromPrefs < SSL_LIBRARY_VERSION_TLS_1_0) {
+    return;
+  }
+
+  // fill out rangeOut
+  rangeOut.min = (uint16_t)minFromPrefs;
+  rangeOut.max = (uint16_t)maxFromPrefs;
+}
+
+static void ConfigureTLSSessionIdentifiers() {
+  bool disableSessionIdentifiers =
+      StaticPrefs::security_ssl_disable_session_identifiers();
+  SSL_OptionSetDefault(SSL_ENABLE_SESSION_TICKETS, !disableSessionIdentifiers);
+  SSL_OptionSetDefault(SSL_NO_CACHE, disableSessionIdentifiers);
+}
+
+nsresult CommonInit() {
+  SSL_OptionSetDefault(SSL_ENABLE_SSL2, false);
+  SSL_OptionSetDefault(SSL_V2_COMPATIBLE_HELLO, false);
+
+  nsresult rv = nsNSSComponent::SetEnabledTLSVersions();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  ConfigureTLSSessionIdentifiers();
+
+  SSL_OptionSetDefault(SSL_REQUIRE_SAFE_NEGOTIATION,
+                       StaticPrefs::security_ssl_require_safe_negotiation());
+  SSL_OptionSetDefault(SSL_ENABLE_RENEGOTIATION, SSL_RENEGOTIATE_REQUIRES_XTN);
+  SSL_OptionSetDefault(SSL_ENABLE_EXTENDED_MASTER_SECRET, true);
+  SSL_OptionSetDefault(SSL_ENABLE_HELLO_DOWNGRADE_CHECK,
+                       StaticPrefs::security_tls_hello_downgrade_check());
+  SSL_OptionSetDefault(SSL_ENABLE_FALSE_START,
+                       StaticPrefs::security_ssl_enable_false_start());
+  // SSL_ENABLE_ALPN also requires calling SSL_SetNextProtoNego in order for
+  // the extensions to be negotiated.
+  // WebRTC does not do that so it will not use ALPN even when this preference
+  // is true.
+  SSL_OptionSetDefault(SSL_ENABLE_ALPN,
+                       StaticPrefs::security_ssl_enable_alpn());
+  SSL_OptionSetDefault(SSL_ENABLE_0RTT_DATA,
+                       StaticPrefs::security_tls_enable_0rtt_data());
+  SSL_OptionSetDefault(SSL_ENABLE_POST_HANDSHAKE_AUTH,
+                       StaticPrefs::security_tls_enable_post_handshake_auth());
+  SSL_OptionSetDefault(
+      SSL_ENABLE_DELEGATED_CREDENTIALS,
+      StaticPrefs::security_tls_enable_delegated_credentials());
+
+  rv = InitializeCipherSuite();
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Error,
+            ("Unable to initialize cipher suite settings\n"));
+    return rv;
+  }
+
+  DisableMD5();
+
+  mozilla::pkix::RegisterErrorTable();
+  SharedSSLState::GlobalInit();
+  SetValidationOptionsCommon();
+
+  return NS_OK;
+}
+
+void PrepareForShutdownInSocketProcess() {
+  MOZ_ASSERT(XRE_IsSocketProcess());
+  SharedSSLState::GlobalCleanup();
+}
+
+bool HandleTLSPrefChange(const nsCString& prefName) {
+  // Note that the code in this function should be kept in sync with
+  // gCallbackSecurityPrefs in nsIOService.cpp.
+  bool prefFound = true;
+  if (prefName.EqualsLiteral("security.tls.version.min") ||
+      prefName.EqualsLiteral("security.tls.version.max") ||
+      prefName.EqualsLiteral("security.tls.version.enable-deprecated")) {
+    Unused << nsNSSComponent::SetEnabledTLSVersions();
+  } else if (prefName.EqualsLiteral("security.tls.hello_downgrade_check")) {
+    SSL_OptionSetDefault(SSL_ENABLE_HELLO_DOWNGRADE_CHECK,
+                         StaticPrefs::security_tls_hello_downgrade_check());
+  } else if (prefName.EqualsLiteral("security.ssl.require_safe_negotiation")) {
+    SSL_OptionSetDefault(SSL_REQUIRE_SAFE_NEGOTIATION,
+                         StaticPrefs::security_ssl_require_safe_negotiation());
+  } else if (prefName.EqualsLiteral("security.ssl.enable_false_start")) {
+    SSL_OptionSetDefault(SSL_ENABLE_FALSE_START,
+                         StaticPrefs::security_ssl_enable_false_start());
+  } else if (prefName.EqualsLiteral("security.ssl.enable_alpn")) {
+    SSL_OptionSetDefault(SSL_ENABLE_ALPN,
+                         StaticPrefs::security_ssl_enable_alpn());
+  } else if (prefName.EqualsLiteral("security.tls.enable_0rtt_data")) {
+    SSL_OptionSetDefault(SSL_ENABLE_0RTT_DATA,
+                         StaticPrefs::security_tls_enable_0rtt_data());
+  } else if (prefName.EqualsLiteral(
+                 "security.tls.enable_post_handshake_auth")) {
+    SSL_OptionSetDefault(
+        SSL_ENABLE_POST_HANDSHAKE_AUTH,
+        StaticPrefs::security_tls_enable_post_handshake_auth());
+  } else if (prefName.EqualsLiteral(
+                 "security.tls.enable_delegated_credentials")) {
+    SSL_OptionSetDefault(
+        SSL_ENABLE_DELEGATED_CREDENTIALS,
+        StaticPrefs::security_tls_enable_delegated_credentials());
+  } else if (prefName.EqualsLiteral(
+                 "security.ssl.disable_session_identifiers")) {
+    ConfigureTLSSessionIdentifiers();
+  } else {
+    prefFound = false;
+  }
+  return prefFound;
+}
+
+void SetValidationOptionsCommon() {
+  // Note that the code in this function should be kept in sync with
+  // gCallbackSecurityPrefs in nsIOService.cpp.
+  bool ocspStaplingEnabled = StaticPrefs::security_ssl_enable_ocsp_stapling();
+  PublicSSLState()->SetOCSPStaplingEnabled(ocspStaplingEnabled);
+  PrivateSSLState()->SetOCSPStaplingEnabled(ocspStaplingEnabled);
+
+  bool ocspMustStapleEnabled =
+      StaticPrefs::security_ssl_enable_ocsp_must_staple();
+  PublicSSLState()->SetOCSPMustStapleEnabled(ocspMustStapleEnabled);
+  PrivateSSLState()->SetOCSPMustStapleEnabled(ocspMustStapleEnabled);
+
+  const CertVerifier::CertificateTransparencyMode defaultCTMode =
+      CertVerifier::CertificateTransparencyMode::TelemetryOnly;
+  CertVerifier::CertificateTransparencyMode ctMode =
+      static_cast<CertVerifier::CertificateTransparencyMode>(
+          StaticPrefs::security_pki_certificate_transparency_mode());
+  switch (ctMode) {
+    case CertVerifier::CertificateTransparencyMode::Disabled:
+    case CertVerifier::CertificateTransparencyMode::TelemetryOnly:
+      break;
+    default:
+      ctMode = defaultCTMode;
+      break;
+  }
+  bool sctsEnabled =
+      ctMode != CertVerifier::CertificateTransparencyMode::Disabled;
+  PublicSSLState()->SetSignedCertTimestampsEnabled(sctsEnabled);
+  PrivateSSLState()->SetSignedCertTimestampsEnabled(sctsEnabled);
+}
+
+namespace {
+
+class CipherSuiteChangeObserver : public nsIObserver {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  static nsresult StartObserve();
+
+ protected:
+  virtual ~CipherSuiteChangeObserver() = default;
+
+ private:
+  static StaticRefPtr<CipherSuiteChangeObserver> sObserver;
+  CipherSuiteChangeObserver() = default;
+};
+
+NS_IMPL_ISUPPORTS(CipherSuiteChangeObserver, nsIObserver)
+
+// static
+StaticRefPtr<CipherSuiteChangeObserver> CipherSuiteChangeObserver::sObserver;
+
+// static
+nsresult CipherSuiteChangeObserver::StartObserve() {
+  MOZ_ASSERT(NS_IsMainThread(),
+             "CipherSuiteChangeObserver::StartObserve() can only be accessed "
+             "on the main thread");
+  if (!sObserver) {
+    RefPtr<CipherSuiteChangeObserver> observer =
+        new CipherSuiteChangeObserver();
+    nsresult rv = Preferences::AddStrongObserver(observer.get(), "security.");
+    if (NS_FAILED(rv)) {
+      sObserver = nullptr;
+      return rv;
+    }
+
+    nsCOMPtr<nsIObserverService> observerService =
+        mozilla::services::GetObserverService();
+    observerService->AddObserver(observer, NS_XPCOM_SHUTDOWN_OBSERVER_ID,
+                                 false);
+
+    sObserver = observer;
+  }
+  return NS_OK;
+}
+
+// Enables or disabled ciphersuites from deprecated versions of TLS as
+// appropriate. If security.tls.version.enable-deprecated is true, these
+// ciphersuites may be enabled, if the corresponding preference is true.
+// Otherwise, these ciphersuites will be disabled.
+void SetDeprecatedTLS1CipherPrefs() {
+  if (StaticPrefs::security_tls_version_enable_deprecated()) {
+    for (const auto& deprecatedTLS1CipherPref : sDeprecatedTLS1CipherPrefs) {
+      SSL_CipherPrefSetDefault(deprecatedTLS1CipherPref.id,
+                               deprecatedTLS1CipherPref.prefGetter());
+    }
+  } else {
+    for (const auto& deprecatedTLS1CipherPref : sDeprecatedTLS1CipherPrefs) {
+      SSL_CipherPrefSetDefault(deprecatedTLS1CipherPref.id, false);
+    }
+  }
+}
+
+nsresult CipherSuiteChangeObserver::Observe(nsISupports* /*aSubject*/,
+                                            const char* aTopic,
+                                            const char16_t* someData) {
+  MOZ_ASSERT(NS_IsMainThread(),
+             "CipherSuiteChangeObserver::Observe can only be accessed on main "
+             "thread");
+  if (nsCRT::strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID) == 0) {
+    NS_ConvertUTF16toUTF8 prefName(someData);
+    // Look through the cipher table and set according to pref setting
+    for (const auto& cipherPref : sCipherPrefs) {
+      if (prefName.Equals(cipherPref.pref)) {
+        SSL_CipherPrefSetDefault(cipherPref.id, cipherPref.prefGetter());
+        break;
+      }
+    }
+    SetDeprecatedTLS1CipherPrefs();
+    nsNSSComponent::DoClearSSLExternalAndInternalSessionCache();
+  } else if (nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
+    Preferences::RemoveObserver(this, "security.");
+    MOZ_ASSERT(sObserver.get() == this);
+    sObserver = nullptr;
+    nsCOMPtr<nsIObserverService> observerService =
+        mozilla::services::GetObserverService();
+    observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
+  }
+  return NS_OK;
+}
+
+}  // namespace
+
+void nsNSSComponent::setValidationOptions(
+    bool isInitialSetting, const mozilla::MutexAutoLock& proofOfLock) {
+  // We access prefs so this must be done on the main thread.
+  mMutex.AssertCurrentThreadOwns();
+  MOZ_ASSERT(NS_IsMainThread());
+  if (NS_WARN_IF(!NS_IsMainThread())) {
+    return;
+  }
+
+  SetValidationOptionsCommon();
+
+  const CertVerifier::CertificateTransparencyMode defaultCTMode =
+      CertVerifier::CertificateTransparencyMode::TelemetryOnly;
+  CertVerifier::CertificateTransparencyMode ctMode =
+      static_cast<CertVerifier::CertificateTransparencyMode>(
+          StaticPrefs::security_pki_certificate_transparency_mode());
+  switch (ctMode) {
+    case CertVerifier::CertificateTransparencyMode::Disabled:
+    case CertVerifier::CertificateTransparencyMode::TelemetryOnly:
+      break;
+    default:
+      ctMode = defaultCTMode;
+      break;
+  }
+
+  // This preference controls whether we do OCSP fetching and does not affect
+  // OCSP stapling.
+  // 0 = disabled, 1 = enabled, 2 = only enabled for EV
+  uint32_t ocspEnabled = StaticPrefs::security_OCSP_enabled();
+
+  bool ocspRequired = ocspEnabled > 0 && StaticPrefs::security_OCSP_require();
+
+  // We measure the setting of the pref at startup only to minimize noise by
+  // addons that may muck with the settings, though it probably doesn't matter.
+  if (isInitialSetting) {
+    Telemetry::Accumulate(Telemetry::CERT_OCSP_ENABLED, ocspEnabled);
+    Telemetry::Accumulate(Telemetry::CERT_OCSP_REQUIRED, ocspRequired);
+  }
+
+  NetscapeStepUpPolicy netscapeStepUpPolicy = static_cast<NetscapeStepUpPolicy>(
+      StaticPrefs::security_pki_netscape_step_up_policy());
+  switch (netscapeStepUpPolicy) {
+    case NetscapeStepUpPolicy::AlwaysMatch:
+    case NetscapeStepUpPolicy::MatchBefore23August2016:
+    case NetscapeStepUpPolicy::MatchBefore23August2015:
+    case NetscapeStepUpPolicy::NeverMatch:
+      break;
+    default:
+      netscapeStepUpPolicy = NetscapeStepUpPolicy::AlwaysMatch;
+      break;
+  }
+
+  CRLiteMode defaultCRLiteMode = CRLiteMode::Disabled;
+  CRLiteMode crliteMode =
+      static_cast<CRLiteMode>(StaticPrefs::security_pki_crlite_mode());
+  switch (crliteMode) {
+    case CRLiteMode::Disabled:
+    case CRLiteMode::TelemetryOnly:
+    case CRLiteMode::Enforce:
+    case CRLiteMode::ConfirmRevocations:
+      break;
+    default:
+      crliteMode = defaultCRLiteMode;
+      break;
+  }
+
+  CertVerifier::OcspDownloadConfig odc;
+  CertVerifier::OcspStrictConfig osc;
+  uint32_t certShortLifetimeInDays;
+  TimeDuration softTimeout;
+  TimeDuration hardTimeout;
+
+  GetRevocationBehaviorFromPrefs(&odc, &osc, &certShortLifetimeInDays,
+                                 softTimeout, hardTimeout);
+
+  mDefaultCertVerifier = new SharedCertVerifier(
+      odc, osc, softTimeout, hardTimeout, certShortLifetimeInDays,
+      netscapeStepUpPolicy, ctMode, crliteMode, mEnterpriseCerts);
+}
+
+void nsNSSComponent::UpdateCertVerifierWithEnterpriseRoots() {
+  MutexAutoLock lock(mMutex);
+  MOZ_ASSERT(mDefaultCertVerifier);
+  if (NS_WARN_IF(!mDefaultCertVerifier)) {
+    return;
+  }
+
+  RefPtr<SharedCertVerifier> oldCertVerifier = mDefaultCertVerifier;
+  mDefaultCertVerifier = new SharedCertVerifier(
+      oldCertVerifier->mOCSPDownloadConfig,
+      oldCertVerifier->mOCSPStrict ? CertVerifier::ocspStrict
+                                   : CertVerifier::ocspRelaxed,
+      oldCertVerifier->mOCSPTimeoutSoft, oldCertVerifier->mOCSPTimeoutHard,
+      oldCertVerifier->mCertShortLifetimeInDays,
+      oldCertVerifier->mNetscapeStepUpPolicy, oldCertVerifier->mCTMode,
+      oldCertVerifier->mCRLiteMode, mEnterpriseCerts);
+}
+
+// Enable the TLS versions given in the prefs, defaulting to TLS 1.0 (min) and
+// TLS 1.2 (max) when the prefs aren't set or set to invalid values.
+nsresult nsNSSComponent::SetEnabledTLSVersions() {
+  // Keep these values in sync with all.js.
+  // 1 means TLS 1.0, 2 means TLS 1.1, etc.
+  static const uint32_t PSM_DEFAULT_MIN_TLS_VERSION = 3;
+  static const uint32_t PSM_DEFAULT_MAX_TLS_VERSION = 4;
+  static const uint32_t PSM_DEPRECATED_TLS_VERSION = 1;
+
+  uint32_t minFromPrefs = StaticPrefs::security_tls_version_min();
+  uint32_t maxFromPrefs = StaticPrefs::security_tls_version_max();
+
+  // This override should be removed some time after
+  // PSM_DEFAULT_MIN_TLS_VERSION is increased to 3.
+  bool enableDeprecated = StaticPrefs::security_tls_version_enable_deprecated();
+  if (enableDeprecated) {
+    minFromPrefs = std::min(minFromPrefs, PSM_DEPRECATED_TLS_VERSION);
+  }
+
+  SSLVersionRange defaults = {
+      SSL_LIBRARY_VERSION_3_0 + PSM_DEFAULT_MIN_TLS_VERSION,
+      SSL_LIBRARY_VERSION_3_0 + PSM_DEFAULT_MAX_TLS_VERSION};
+  SSLVersionRange filledInRange;
+  FillTLSVersionRange(filledInRange, minFromPrefs, maxFromPrefs, defaults);
+
+  SECStatus srv =
+      SSL_VersionRangeSetDefault(ssl_variant_stream, &filledInRange);
+  if (srv != SECSuccess) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+#if defined(XP_WIN) || (defined(XP_LINUX) && !defined(ANDROID))
+// If the profile directory is on a networked drive, we want to set the
+// environment variable NSS_SDB_USE_CACHE to yes (as long as it hasn't been set
+// before).
+static void SetNSSDatabaseCacheModeAsAppropriate() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIFile> profileFile;
+  nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                                       getter_AddRefs(profileFile));
+  if (NS_FAILED(rv)) {
+    // We're probably running without a profile directory, so this is
+    // irrelevant.
+    return;
+  }
+
+  static const char sNSS_SDB_USE_CACHE[] = "NSS_SDB_USE_CACHE";
+  static const char sNSS_SDB_USE_CACHE_WITH_VALUE[] = "NSS_SDB_USE_CACHE=yes";
+  auto profilePath = profileFile->NativePath();
+
+#  if defined(XP_LINUX) && !defined(ANDROID)
+  struct statfs statfs_s;
+  if (statfs(profilePath.get(), &statfs_s) == 0 &&
+      statfs_s.f_type == NFS_SUPER_MAGIC && !PR_GetEnv(sNSS_SDB_USE_CACHE)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("profile is remote (and NSS_SDB_USE_CACHE wasn't set): "
+             "setting NSS_SDB_USE_CACHE"));
+    PR_SetEnv(sNSS_SDB_USE_CACHE_WITH_VALUE);
+  } else {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("not setting NSS_SDB_USE_CACHE"));
+  }
+#  endif  // defined(XP_LINUX) && !defined(ANDROID)
+
+#  ifdef XP_WIN
+  wchar_t volPath[MAX_PATH];
+  if (::GetVolumePathNameW(profilePath.get(), volPath, MAX_PATH) &&
+      ::GetDriveTypeW(volPath) == DRIVE_REMOTE &&
+      !PR_GetEnv(sNSS_SDB_USE_CACHE)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("profile is remote (and NSS_SDB_USE_CACHE wasn't set): "
+             "setting NSS_SDB_USE_CACHE"));
+    PR_SetEnv(sNSS_SDB_USE_CACHE_WITH_VALUE);
+  } else {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("not setting NSS_SDB_USE_CACHE"));
+  }
+#  endif  // XP_WIN
+}
+#endif  // defined(XP_WIN) || (defined(XP_LINUX) && !defined(ANDROID))
+
+static nsresult GetNSSProfilePath(nsAutoCString& aProfilePath) {
+  aProfilePath.Truncate();
+  nsCOMPtr<nsIFile> profileFile;
+  nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                                       getter_AddRefs(profileFile));
+  if (NS_FAILED(rv)) {
+    NS_WARNING(
+        "NSS will be initialized without a profile directory. "
+        "Some things may not work as expected.");
+    return NS_OK;
+  }
+
+#if defined(XP_WIN)
+  // SQLite always takes UTF-8 file paths regardless of the current system
+  // code page.
+  nsCOMPtr<nsILocalFileWin> profileFileWin(do_QueryInterface(profileFile));
+  if (!profileFileWin) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Error,
+            ("Could not get nsILocalFileWin for profile directory.\n"));
+    return NS_ERROR_FAILURE;
+  }
+  nsAutoString u16ProfilePath;
+  rv = profileFileWin->GetPath(u16ProfilePath);
+  CopyUTF16toUTF8(u16ProfilePath, aProfilePath);
+#else
+  rv = profileFile->GetNativePath(aProfilePath);
+#endif
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Error,
+            ("Could not get native path for profile directory.\n"));
+    return rv;
+  }
+
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+          ("NSS profile at '%s'\n", aProfilePath.get()));
+  return NS_OK;
+}
+
+#ifndef ANDROID
+// Given a profile path, attempt to rename the PKCS#11 module DB to
+// "pkcs11.txt.fips". In the case of a catastrophic failure (e.g. out of
+// memory), returns a failing nsresult. If execution could conceivably proceed,
+// returns NS_OK even if renaming the file didn't work. This simplifies the
+// logic of the calling code.
+// |profilePath| is encoded in UTF-8.
+static nsresult AttemptToRenamePKCS11ModuleDB(const nsACString& profilePath) {
+  nsCOMPtr<nsIFile> profileDir = do_CreateInstance("@mozilla.org/file/local;1");
+  if (!profileDir) {
+    return NS_ERROR_FAILURE;
+  }
+#  ifdef XP_WIN
+  // |profilePath| is encoded in UTF-8 because SQLite always takes UTF-8 file
+  // paths regardless of the current system code page.
+  nsresult rv = profileDir->InitWithPath(NS_ConvertUTF8toUTF16(profilePath));
+#  else
+  nsresult rv = profileDir->InitWithNativePath(profilePath);
+#  endif
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  const char* moduleDBFilename = "pkcs11.txt";
+  nsAutoCString destModuleDBFilename(moduleDBFilename);
+  destModuleDBFilename.Append(".fips");
+  nsCOMPtr<nsIFile> dbFile;
+  rv = profileDir->Clone(getter_AddRefs(dbFile));
+  if (NS_FAILED(rv) || !dbFile) {
+    return NS_ERROR_FAILURE;
+  }
+  rv = dbFile->AppendNative(nsAutoCString(moduleDBFilename));
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  // If the PKCS#11 module DB doesn't exist, renaming it won't help.
+  bool exists;
+  rv = dbFile->Exists(&exists);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  // This is strange, but not a catastrophic failure.
+  if (!exists) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("%s doesn't exist?", moduleDBFilename));
+    return NS_OK;
+  }
+  nsCOMPtr<nsIFile> destDBFile;
+  rv = profileDir->Clone(getter_AddRefs(destDBFile));
+  if (NS_FAILED(rv) || !destDBFile) {
+    return NS_ERROR_FAILURE;
+  }
+  rv = destDBFile->AppendNative(destModuleDBFilename);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  // If the destination exists, presumably we've already tried this. Doing it
+  // again won't help.
+  rv = destDBFile->Exists(&exists);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  // Unfortunate, but not a catastrophic failure.
+  if (exists) {
+    MOZ_LOG(
+        gPIPNSSLog, LogLevel::Debug,
+        ("%s already exists - not overwriting", destModuleDBFilename.get()));
+    return NS_OK;
+  }
+  // Now do the actual move.
+  // This may fail on, e.g., a read-only file system. This would be unfortunate,
+  // but again it isn't catastropic and we would want to fall back to
+  // initializing NSS in no-DB mode.
+  Unused << dbFile->MoveToNative(profileDir, destModuleDBFilename);
+  return NS_OK;
+}
+#endif  // ifndef ANDROID
+
+// Given a profile directory, attempt to initialize NSS. If nocertdb is true,
+// (or if we don't have a profile directory) simply initialize NSS in no DB mode
+// and return. Otherwise, first attempt to initialize in read/write mode, and
+// then read-only mode if that fails. If both attempts fail, we may be failing
+// to initialize an NSS DB collection that has FIPS mode enabled. Attempt to
+// ascertain if this is the case, and if so, rename the offending PKCS#11 module
+// DB so we can (hopefully) initialize NSS in read-write mode. Again attempt
+// read-only mode if that fails. Finally, fall back to no DB mode. On Android
+// we can skip the FIPS workaround since it was never possible to enable FIPS
+// there anyway.
+// |profilePath| is encoded in UTF-8.
+static nsresult InitializeNSSWithFallbacks(const nsACString& profilePath,
+                                           bool nocertdb, bool safeMode) {
+  if (nocertdb || profilePath.IsEmpty()) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("nocertdb mode or empty profile path -> NSS_NoDB_Init"));
+    SECStatus srv = NSS_NoDB_Init(nullptr);
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    if (srv != SECSuccess) {
+      MOZ_CRASH_UNSAFE_PRINTF("InitializeNSSWithFallbacks failed: %d",
+                              PR_GetError());
+    }
+#endif
+    return srv == SECSuccess ? NS_OK : NS_ERROR_FAILURE;
+  }
+
+  // Try read/write mode. If we're in safeMode, we won't load PKCS#11 modules.
+#ifndef ANDROID
+  PRErrorCode savedPRErrorCode1;
+#endif  // ifndef ANDROID
+  PKCS11DBConfig safeModeDBConfig =
+      safeMode ? PKCS11DBConfig::DoNotLoadModules : PKCS11DBConfig::LoadModules;
+  SECStatus srv = ::mozilla::psm::InitializeNSS(
+      profilePath, NSSDBConfig::ReadWrite, safeModeDBConfig);
+  if (srv == SECSuccess) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("initialized NSS in r/w mode"));
+    return NS_OK;
+  }
+#ifndef ANDROID
+  savedPRErrorCode1 = PR_GetError();
+  PRErrorCode savedPRErrorCode2;
+#endif  // ifndef ANDROID
+  // That failed. Try read-only mode.
+  srv = ::mozilla::psm::InitializeNSS(profilePath, NSSDBConfig::ReadOnly,
+                                      safeModeDBConfig);
+  if (srv == SECSuccess) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("initialized NSS in r-o mode"));
+    return NS_OK;
+  }
+#ifndef ANDROID
+  savedPRErrorCode2 = PR_GetError();
+
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+          ("failed to initialize NSS with codes %d %d", savedPRErrorCode1,
+           savedPRErrorCode2));
+#endif  // ifndef ANDROID
+
+#ifndef ANDROID
+  // That failed as well. Maybe we're trying to load a PKCS#11 module DB that is
+  // in FIPS mode, but we don't support FIPS? Test load NSS without PKCS#11
+  // modules. If that succeeds, that's probably what's going on.
+  if (!safeMode && (savedPRErrorCode1 == SEC_ERROR_LEGACY_DATABASE ||
+                    savedPRErrorCode2 == SEC_ERROR_LEGACY_DATABASE ||
+                    savedPRErrorCode1 == SEC_ERROR_PKCS11_DEVICE_ERROR ||
+                    savedPRErrorCode2 == SEC_ERROR_PKCS11_DEVICE_ERROR)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("attempting no-module db init"));
+    // It would make sense to initialize NSS in read-only mode here since this
+    // is just a test to see if the PKCS#11 module DB being in FIPS mode is the
+    // problem, but for some reason the combination of read-only and no-moddb
+    // flags causes NSS initialization to fail, so unfortunately we have to use
+    // read-write mode.
+    srv = ::mozilla::psm::InitializeNSS(profilePath, NSSDBConfig::ReadWrite,
+                                        PKCS11DBConfig::DoNotLoadModules);
+    if (srv == SECSuccess) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("FIPS may be the problem"));
+      // Unload NSS so we can attempt to fix this situation for the user.
+      srv = NSS_Shutdown();
+      if (srv != SECSuccess) {
+#  ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+        MOZ_CRASH_UNSAFE_PRINTF("InitializeNSSWithFallbacks failed: %d",
+                                PR_GetError());
+#  endif
+        return NS_ERROR_FAILURE;
+      }
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("trying to rename module db"));
+      // If this fails non-catastrophically, we'll attempt to initialize NSS
+      // again in r/w then r-o mode (both of which will fail), and then we'll
+      // fall back to NSS_NoDB_Init, which is the behavior we want.
+      nsresult rv = AttemptToRenamePKCS11ModuleDB(profilePath);
+      if (NS_FAILED(rv)) {
+#  ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+        // An nsresult is a uint32_t, but at least one of our compilers doesn't
+        // like this format string unless we include the cast. <shruggie emoji>
+        MOZ_CRASH_UNSAFE_PRINTF("InitializeNSSWithFallbacks failed: %u",
+                                (uint32_t)rv);
+#  endif
+        return rv;
+      }
+      srv = ::mozilla::psm::InitializeNSS(profilePath, NSSDBConfig::ReadWrite,
+                                          PKCS11DBConfig::LoadModules);
+      if (srv == SECSuccess) {
+        MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("initialized in r/w mode"));
+        return NS_OK;
+      }
+      srv = ::mozilla::psm::InitializeNSS(profilePath, NSSDBConfig::ReadOnly,
+                                          PKCS11DBConfig::LoadModules);
+      if (srv == SECSuccess) {
+        MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("initialized in r-o mode"));
+        return NS_OK;
+      }
+    }
+  }
+#endif
+
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("last-resort NSS_NoDB_Init"));
+  srv = NSS_NoDB_Init(nullptr);
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+  if (srv != SECSuccess) {
+    MOZ_CRASH_UNSAFE_PRINTF("InitializeNSSWithFallbacks failed: %d",
+                            PR_GetError());
+  }
+#endif
+  return srv == SECSuccess ? NS_OK : NS_ERROR_FAILURE;
+}
+
+#if defined(NIGHTLY_BUILD) && !defined(ANDROID)
+// dbType is either "cert9.db" or "key4.db"
+void UnmigrateOneCertDB(const nsCOMPtr<nsIFile>& profileDirectory,
+                        const nsACString& dbType) {
+  nsCOMPtr<nsIFile> dbFile;
+  nsresult rv = profileDirectory->Clone(getter_AddRefs(dbFile));
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  rv = dbFile->AppendNative(dbType);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  bool exists;
+  rv = dbFile->Exists(&exists);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  // If the unprefixed DB already exists, don't overwrite it.
+  if (exists) {
+    return;
+  }
+  nsCOMPtr<nsIFile> prefixedDBFile;
+  rv = profileDirectory->Clone(getter_AddRefs(prefixedDBFile));
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  nsAutoCString prefixedDBName("gecko-no-share-");
+  prefixedDBName.Append(dbType);
+  rv = prefixedDBFile->AppendNative(prefixedDBName);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  Unused << prefixedDBFile->MoveToNative(nullptr, dbType);
+}
+
+void UnmigrateFromPrefixedCertDBs() {
+  nsCOMPtr<nsIFile> profileDirectory;
+  nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                                       getter_AddRefs(profileDirectory));
+  if (NS_FAILED(rv)) {
+    return;
+  }
+  UnmigrateOneCertDB(profileDirectory, "cert9.db"_ns);
+  UnmigrateOneCertDB(profileDirectory, "key4.db"_ns);
+}
+#endif  // defined(NIGHTLY_BUILD) && !defined(ANDROID)
+
+nsresult nsNSSComponent::InitializeNSS() {
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("nsNSSComponent::InitializeNSS\n"));
+  AUTO_PROFILER_LABEL("nsNSSComponent::InitializeNSS", OTHER);
+  AUTO_PROFILER_TRACING_MARKER("NSS", "nsNSSComponent::InitializeNSS", OTHER);
+
+  static_assert(
+      nsINSSErrorsService::NSS_SEC_ERROR_BASE == SEC_ERROR_BASE &&
+          nsINSSErrorsService::NSS_SEC_ERROR_LIMIT == SEC_ERROR_LIMIT &&
+          nsINSSErrorsService::NSS_SSL_ERROR_BASE == SSL_ERROR_BASE &&
+          nsINSSErrorsService::NSS_SSL_ERROR_LIMIT == SSL_ERROR_LIMIT,
+      "You must update the values in nsINSSErrorsService.idl");
+
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("NSS Initialization beginning\n"));
+
+  nsAutoCString profileStr;
+  nsresult rv = GetNSSProfilePath(profileStr);
+  MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
+  if (NS_FAILED(rv)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+#if defined(NIGHTLY_BUILD) && !defined(ANDROID)
+  if (!profileStr.IsEmpty()) {
+    UnmigrateFromPrefixedCertDBs();
+  }
+#endif
+
+#if defined(XP_WIN) || (defined(XP_LINUX) && !defined(ANDROID))
+  SetNSSDatabaseCacheModeAsAppropriate();
+#endif
+
+  bool nocertdb = StaticPrefs::security_nocertdb_AtStartup();
+  bool inSafeMode = true;
+  nsCOMPtr<nsIXULRuntime> runtime(do_GetService("@mozilla.org/xre/runtime;1"));
+  // There might not be an nsIXULRuntime in embedded situations. This will
+  // default to assuming we are in safe mode (as a result, no external PKCS11
+  // modules will be loaded).
+  if (runtime) {
+    rv = runtime->GetInSafeMode(&inSafeMode);
+    MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("inSafeMode: %u\n", inSafeMode));
+
+  rv = InitializeNSSWithFallbacks(profileStr, nocertdb, inSafeMode);
+  MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("failed to initialize NSS"));
+    return rv;
+  }
+
+  PK11_SetPasswordFunc(PK11PasswordPrompt);
+
+  // Register an observer so we can inform NSS when these prefs change
+  Preferences::AddStrongObserver(this, "security.");
+
+  rv = CommonInit();
+
+  MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
+  if (NS_FAILED(rv)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsCOMPtr<nsICertOverrideService> certOverrideService(
+      do_GetService(NS_CERTOVERRIDE_CONTRACTID));
+  nsCOMPtr<nsIClientAuthRememberService> clientAuthRememberService(
+      do_GetService(NS_CLIENTAUTHREMEMBERSERVICE_CONTRACTID));
+  nsCOMPtr<nsISiteSecurityService> siteSecurityService(
+      do_GetService(NS_SSSERVICE_CONTRACTID));
+  nsCOMPtr<nsICertStorage> certStorage(do_GetService(NS_CERT_STORAGE_CID));
+
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("NSS Initialization done\n"));
+
+  {
+    MutexAutoLock lock(mMutex);
+
+    // ensure we have initial values for various root hashes
+#ifdef DEBUG
+    mTestBuiltInRootHash.Truncate();
+    Preferences::GetCString("security.test.built_in_root_hash",
+                            mTestBuiltInRootHash);
+#endif
+    mMitmCanaryIssuer.Truncate();
+    Preferences::GetString("security.pki.mitm_canary_issuer",
+                           mMitmCanaryIssuer);
+    mMitmDetecionEnabled =
+        Preferences::GetBool("security.pki.mitm_canary_issuer.enabled", true);
+
+    // Set dynamic options from prefs.
+    setValidationOptions(true, lock);
+
+    bool importEnterpriseRoots =
+        StaticPrefs::security_enterprise_roots_enabled();
+    uint32_t familySafetyMode = StaticPrefs::security_family_safety_mode();
+    Vector<nsCString> possibleLoadableRootsLocations;
+    rv = ListPossibleLoadableRootsLocations(possibleLoadableRootsLocations);
+    MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    bool loadOSClientCertsModule =
+        StaticPrefs::security_osclientcerts_autoload();
+    Maybe<nsCString> maybeOSClientCertsModuleLocation;
+    if (loadOSClientCertsModule) {
+      nsAutoCString libraryDir;
+      if (NS_SUCCEEDED(GetDirectoryPath(NS_GRE_BIN_DIR, libraryDir))) {
+        maybeOSClientCertsModuleLocation.emplace(libraryDir);
+      }
+    }
+    RefPtr<LoadLoadableCertsTask> loadLoadableCertsTask(
+        new LoadLoadableCertsTask(this, importEnterpriseRoots, familySafetyMode,
+                                  std::move(possibleLoadableRootsLocations),
+                                  std::move(maybeOSClientCertsModuleLocation)));
+    rv = loadLoadableCertsTask->Dispatch();
+    MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    return NS_OK;
+  }
+}
+
+void nsNSSComponent::PrepareForShutdown() {
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("nsNSSComponent::PrepareForShutdown"));
+  MOZ_RELEASE_ASSERT(NS_IsMainThread());
+
+  PK11_SetPasswordFunc((PK11PasswordFunc) nullptr);
+
+  Preferences::RemoveObserver(this, "security.");
+
+  if (mIntermediatePreloadingHealerTimer) {
+    mIntermediatePreloadingHealerTimer->Cancel();
+    mIntermediatePreloadingHealerTimer = nullptr;
+  }
+
+  // Release the default CertVerifier. This will cause any held NSS resources
+  // to be released.
+  MutexAutoLock lock(mMutex);
+  mDefaultCertVerifier = nullptr;
+  // We don't actually shut down NSS - XPCOM does, after all threads have been
+  // joined and the component manager has been shut down (and so there shouldn't
+  // be any XPCOM objects holding NSS resources).
+}
+
+// The aim of the intermediate preloading healer is to remove intermediates
+// that were previously cached by PSM in the NSS certdb that are now preloaded
+// in cert_storage. When cached by PSM, these certificates will have no
+// particular trust set - they are intended to inherit their trust. If, upon
+// examination, these certificates do have trust bits set that affect
+// certificate validation, they must have been modified by the user, so we want
+// to leave them alone.
+bool CertHasDefaultTrust(CERTCertificate* cert) {
+  CERTCertTrust trust;
+  if (CERT_GetCertTrust(cert, &trust) != SECSuccess) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("CERT_GetCertTrust failed"));
+    return false;
+  }
+  // This is the active distrust test for CA certificates (this is expected to
+  // be an intermediate).
+  if ((trust.sslFlags & (CERTDB_TRUSTED_CA | CERTDB_TERMINAL_RECORD)) ==
+      CERTDB_TERMINAL_RECORD) {
+    return false;
+  }
+  // This is the trust anchor test.
+  if (trust.sslFlags & CERTDB_TRUSTED_CA) {
+    return false;
+  }
+  // This is the active distrust test for CA certificates (this is expected to
+  // be an intermediate).
+  if ((trust.emailFlags & (CERTDB_TRUSTED_CA | CERTDB_TERMINAL_RECORD)) ==
+      CERTDB_TERMINAL_RECORD) {
+    return false;
+  }
+  // This is the trust anchor test.
+  if (trust.emailFlags & CERTDB_TRUSTED_CA) {
+    return false;
+  }
+  return true;
+}
+
+void IntermediatePreloadingHealerCallback(nsITimer*, void*) {
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+          ("IntermediatePreloadingHealerCallback"));
+
+  if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("Exiting healer due to app shutdown"));
+    return;
+  }
+
+  // Get the slot corresponding to the NSS certdb.
+  UniquePK11SlotInfo softokenSlot(PK11_GetInternalKeySlot());
+  if (!softokenSlot) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("PK11_GetInternalKeySlot failed"));
+    return;
+  }
+  // List the certificates in the NSS certdb.
+  UniqueCERTCertList softokenCertificates(
+      PK11_ListCertsInSlot(softokenSlot.get()));
+  if (!softokenCertificates) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("PK11_ListCertsInSlot failed"));
+    return;
+  }
+  nsCOMPtr<nsICertStorage> certStorage(do_GetService(NS_CERT_STORAGE_CID));
+  if (!certStorage) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("couldn't get cert_storage"));
+    return;
+  }
+  Vector<UniqueCERTCertificate> certsToDelete;
+  // For each certificate, look it up in cert_storage. If there's a match, this
+  // is a preloaded intermediate.
+  for (CERTCertListNode* n = CERT_LIST_HEAD(softokenCertificates);
+       !CERT_LIST_END(n, softokenCertificates); n = CERT_LIST_NEXT(n)) {
+    if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+              ("Exiting healer due to app shutdown"));
+      return;
+    }
+
+    nsTArray<uint8_t> subject;
+    subject.AppendElements(n->cert->derSubject.data, n->cert->derSubject.len);
+    nsTArray<nsTArray<uint8_t>> certs;
+    nsresult rv = certStorage->FindCertsBySubject(subject, certs);
+    if (NS_FAILED(rv)) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("FindCertsBySubject failed"));
+      break;
+    }
+    for (const auto& encodedCert : certs) {
+      if (encodedCert.Length() != n->cert->derCert.len) {
+        continue;
+      }
+      if (memcmp(encodedCert.Elements(), n->cert->derCert.data,
+                 encodedCert.Length()) != 0) {
+        continue;
+      }
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+              ("found preloaded intermediate in certdb"));
+      if (!CertHasDefaultTrust(n->cert)) {
+        MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+                ("certificate doesn't have default trust - skipping"));
+        continue;
+      }
+      UniqueCERTCertificate certCopy(CERT_DupCertificate(n->cert));
+      if (!certCopy) {
+        MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("CERT_DupCertificate failed"));
+        continue;
+      }
+      // Note that we want to remove this certificate from the NSS certdb
+      // because it also exists in preloaded intermediate storage and is thus
+      // superfluous.
+      if (!certsToDelete.append(std::move(certCopy))) {
+        MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+                ("append failed - out of memory?"));
+        return;
+      }
+      break;
+    }
+    // Only delete 20 at a time.
+    if (certsToDelete.length() >= 20) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+              ("found limit of 20 preloaded intermediates in certdb"));
+      break;
+    }
+  }
+  for (const auto& certToDelete : certsToDelete) {
+    if (AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed)) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+              ("Exiting healer due to app shutdown"));
+      return;
+    }
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("attempting to delete preloaded intermediate '%s'",
+             certToDelete->subjectName));
+    if (SEC_DeletePermCertificate(certToDelete.get()) != SECSuccess) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+              ("SEC_DeletePermCertificate failed"));
+    }
+  }
+
+  // This is for tests - notify that this ran.
+  nsCOMPtr<nsIRunnable> runnable(NS_NewRunnableFunction(
+      "IntermediatePreloadingHealerCallbackDone", []() -> void {
+        nsCOMPtr<nsIObserverService> observerService =
+            mozilla::services::GetObserverService();
+        if (observerService) {
+          observerService->NotifyObservers(
+              nullptr, "psm:intermediate-preloading-healer-ran", nullptr);
+        }
+      }));
+  Unused << NS_DispatchToMainThread(runnable.forget());
+}
+
+nsresult nsNSSComponent::Init() {
+  MOZ_RELEASE_ASSERT(NS_IsMainThread());
+  if (!NS_IsMainThread()) {
+    return NS_ERROR_NOT_SAME_THREAD;
+  }
+
+  MOZ_ASSERT(XRE_IsParentProcess());
+  if (!XRE_IsParentProcess()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  Telemetry::AutoScalarTimer<Telemetry::ScalarID::NETWORKING_NSS_INITIALIZATION>
+      timer;
+  uint32_t zero = 0;  // Directly using 0 makes the call to ScalarSet ambiguous.
+  Telemetry::ScalarSet(Telemetry::ScalarID::SECURITY_CLIENT_AUTH_CERT_USAGE,
+                       u"requested"_ns, zero);
+  Telemetry::ScalarSet(Telemetry::ScalarID::SECURITY_CLIENT_AUTH_CERT_USAGE,
+                       u"sent"_ns, zero);
+
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("Beginning NSS initialization\n"));
+
+  nsresult rv = InitializeNSS();
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Error,
+            ("nsNSSComponent::InitializeNSS() failed\n"));
+    return rv;
+  }
+
+  rv = RegisterObservers();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  rv = MaybeEnableIntermediatePreloadingHealer();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult nsNSSComponent::MaybeEnableIntermediatePreloadingHealer() {
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+          ("nsNSSComponent::MaybeEnableIntermediatePreloadingHealer"));
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!NS_IsMainThread()) {
+    return NS_ERROR_NOT_SAME_THREAD;
+  }
+
+  if (mIntermediatePreloadingHealerTimer) {
+    mIntermediatePreloadingHealerTimer->Cancel();
+    mIntermediatePreloadingHealerTimer = nullptr;
+  }
+
+  if (!StaticPrefs::security_intermediate_preloading_healer_enabled()) {
+    return NS_OK;
+  }
+
+  if (!mIntermediatePreloadingHealerTaskQueue) {
+    nsresult rv = NS_CreateBackgroundTaskQueue(
+        "IntermediatePreloadingHealer",
+        getter_AddRefs(mIntermediatePreloadingHealerTaskQueue));
+    if (NS_FAILED(rv)) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Error,
+              ("NS_CreateBackgroundTaskQueue failed"));
+      return rv;
+    }
+  }
+  uint32_t timerDelayMS =
+      StaticPrefs::security_intermediate_preloading_healer_timer_interval_ms();
+  nsresult rv = NS_NewTimerWithFuncCallback(
+      getter_AddRefs(mIntermediatePreloadingHealerTimer),
+      IntermediatePreloadingHealerCallback, nullptr, timerDelayMS,
+      nsITimer::TYPE_REPEATING_SLACK_LOW_PRIORITY,
+      "IntermediatePreloadingHealer", mIntermediatePreloadingHealerTaskQueue);
+  if (NS_FAILED(rv)) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Error,
+            ("NS_NewTimerWithFuncCallback failed"));
+    return rv;
+  }
+  return NS_OK;
+}
+
+// nsISupports Implementation for the class
+NS_IMPL_ISUPPORTS(nsNSSComponent, nsINSSComponent, nsIObserver)
+
+static const char* const PROFILE_BEFORE_CHANGE_TOPIC = "profile-before-change";
+
+NS_IMETHODIMP
+nsNSSComponent::Observe(nsISupports* aSubject, const char* aTopic,
+                        const char16_t* someData) {
+  // In some tests, we don't receive a "profile-before-change" topic. However,
+  // we still have to shut down before the storage service shuts down, because
+  // closing the sql-backed softoken requires sqlite still be available. Thus,
+  // we observe "xpcom-shutdown" just in case.
+  if (nsCRT::strcmp(aTopic, PROFILE_BEFORE_CHANGE_TOPIC) == 0 ||
+      nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("receiving profile change or XPCOM shutdown notification"));
+    PrepareForShutdown();
+  } else if (nsCRT::strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID) == 0) {
+    bool clearSessionCache = true;
+    NS_ConvertUTF16toUTF8 prefName(someData);
+
+    if (HandleTLSPrefChange(prefName)) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("HandleTLSPrefChange done"));
+    } else if (prefName.EqualsLiteral("security.OCSP.enabled") ||
+               prefName.EqualsLiteral("security.OCSP.require") ||
+               prefName.EqualsLiteral(
+                   "security.pki.cert_short_lifetime_in_days") ||
+               prefName.EqualsLiteral("security.ssl.enable_ocsp_stapling") ||
+               prefName.EqualsLiteral("security.ssl.enable_ocsp_must_staple") ||
+               prefName.EqualsLiteral(
+                   "security.pki.certificate_transparency.mode") ||
+               prefName.EqualsLiteral("security.pki.netscape_step_up_policy") ||
+               prefName.EqualsLiteral(
+                   "security.OCSP.timeoutMilliseconds.soft") ||
+               prefName.EqualsLiteral(
+                   "security.OCSP.timeoutMilliseconds.hard") ||
+               prefName.EqualsLiteral("security.pki.crlite_mode")) {
+      MutexAutoLock lock(mMutex);
+      setValidationOptions(false, lock);
+#ifdef DEBUG
+    } else if (prefName.EqualsLiteral("security.test.built_in_root_hash")) {
+      MutexAutoLock lock(mMutex);
+      mTestBuiltInRootHash.Truncate();
+      Preferences::GetCString("security.test.built_in_root_hash",
+                              mTestBuiltInRootHash);
+#endif  // DEBUG
+    } else if (prefName.Equals("security.enterprise_roots.enabled") ||
+               prefName.Equals("security.family_safety.mode")) {
+      UnloadEnterpriseRoots();
+      MaybeImportEnterpriseRoots();
+    } else if (prefName.Equals("security.osclientcerts.autoload")) {
+      bool loadOSClientCertsModule =
+          StaticPrefs::security_osclientcerts_autoload();
+      AsyncLoadOrUnloadOSClientCertsModule(loadOSClientCertsModule);
+    } else if (prefName.EqualsLiteral("security.pki.mitm_canary_issuer")) {
+      MutexAutoLock lock(mMutex);
+      mMitmCanaryIssuer.Truncate();
+      Preferences::GetString("security.pki.mitm_canary_issuer",
+                             mMitmCanaryIssuer);
+    } else if (prefName.EqualsLiteral(
+                   "security.pki.mitm_canary_issuer.enabled")) {
+      MutexAutoLock lock(mMutex);
+      mMitmDetecionEnabled =
+          Preferences::GetBool("security.pki.mitm_canary_issuer.enabled", true);
+    } else {
+      clearSessionCache = false;
+    }
+    if (clearSessionCache) {
+      ClearSSLExternalAndInternalSessionCache();
+    }
+
+    // Preferences that don't affect certificate verification.
+    if (prefName.Equals("security.intermediate_preloading_healer.enabled") ||
+        prefName.Equals(
+            "security.intermediate_preloading_healer.timer_interval_ms")) {
+      MaybeEnableIntermediatePreloadingHealer();
+    }
+  }
+
+  return NS_OK;
+}
+
+/*static*/
+nsresult nsNSSComponent::GetNewPrompter(nsIPrompt** result) {
+  NS_ENSURE_ARG_POINTER(result);
+  *result = nullptr;
+
+  if (!NS_IsMainThread()) {
+    NS_ERROR("nsSDRContext::GetNewPrompter called off the main thread");
+    return NS_ERROR_NOT_SAME_THREAD;
+  }
+
+  nsresult rv;
+  nsCOMPtr<nsIWindowWatcher> wwatch(
+      do_GetService(NS_WINDOWWATCHER_CONTRACTID, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = wwatch->GetNewPrompter(0, result);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return rv;
+}
+
+nsresult nsNSSComponent::LogoutAuthenticatedPK11() {
+  nsCOMPtr<nsICertOverrideService> icos =
+      do_GetService("@mozilla.org/security/certoverride;1");
+  if (icos) {
+    icos->ClearValidityOverride("all:temporary-certificates"_ns, 0,
+                                OriginAttributes());
+  }
+
+  ClearSSLExternalAndInternalSessionCache();
+
+  nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+  if (os) {
+    os->NotifyObservers(nullptr, "net:cancel-all-connections", nullptr);
+  }
+
+  return NS_OK;
+}
+
+nsresult nsNSSComponent::RegisterObservers() {
+  nsCOMPtr<nsIObserverService> observerService(
+      do_GetService("@mozilla.org/observer-service;1"));
+  if (!observerService) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("nsNSSComponent: couldn't get observer service\n"));
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("nsNSSComponent: adding observers\n"));
+  // Using false for the ownsweak parameter means the observer service will
+  // keep a strong reference to this component. As a result, this will live at
+  // least as long as the observer service.
+  observerService->AddObserver(this, PROFILE_BEFORE_CHANGE_TOPIC, false);
+  observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
+
+  return NS_OK;
+}
+
+nsresult DoesCertMatchFingerprint(const nsTArray<uint8_t>& cert,
+                                  const nsCString& fingerprint, bool& result) {
+  result = false;
+
+  if (cert.Length() > std::numeric_limits<uint32_t>::max()) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  nsTArray<uint8_t> digestArray;
+  nsresult rv = Digest::DigestBuf(SEC_OID_SHA256, cert.Elements(),
+                                  cert.Length(), digestArray);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  SECItem digestItem = {siBuffer, digestArray.Elements(),
+                        static_cast<unsigned int>(digestArray.Length())};
+  UniquePORTString certFingerprint(
+      CERT_Hexify(&digestItem, true /* use colon delimiters */));
+  if (!certFingerprint) {
+    return NS_ERROR_FAILURE;
+  }
+
+  result = fingerprint.Equals(certFingerprint.get());
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNSSComponent::IsCertTestBuiltInRoot(const nsTArray<uint8_t>& cert,
+                                      bool* result) {
+  NS_ENSURE_ARG_POINTER(result);
+  *result = false;
+
+#ifdef DEBUG
+  MutexAutoLock lock(mMutex);
+  nsresult rv = DoesCertMatchFingerprint(cert, mTestBuiltInRootHash, *result);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+#endif  // DEBUG
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNSSComponent::IssuerMatchesMitmCanary(const char* aCertIssuer) {
+  MutexAutoLock lock(mMutex);
+  if (mMitmDetecionEnabled && !mMitmCanaryIssuer.IsEmpty()) {
+    nsString certIssuer = NS_ConvertUTF8toUTF16(aCertIssuer);
+    if (mMitmCanaryIssuer.Equals(certIssuer)) {
+      return NS_OK;
+    }
+  }
+
+  return NS_ERROR_FAILURE;
+}
+
+SharedCertVerifier::~SharedCertVerifier() = default;
+
+NS_IMETHODIMP
+nsNSSComponent::GetDefaultCertVerifier(SharedCertVerifier** result) {
+  MutexAutoLock lock(mMutex);
+  NS_ENSURE_ARG_POINTER(result);
+  RefPtr<SharedCertVerifier> certVerifier(mDefaultCertVerifier);
+  certVerifier.forget(result);
+  return NS_OK;
+}
+
+// static
+void nsNSSComponent::DoClearSSLExternalAndInternalSessionCache() {
+  SSL_ClearSessionCache();
+  mozilla::net::SSLTokensCache::Clear();
+}
+
+NS_IMETHODIMP
+nsNSSComponent::ClearSSLExternalAndInternalSessionCache() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  if (!XRE_IsParentProcess()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (mozilla::net::nsIOService::UseSocketProcess()) {
+    if (mozilla::net::gIOService) {
+      mozilla::net::gIOService->CallOrWaitForSocketProcess([]() {
+        Unused << mozilla::net::SocketProcessParent::GetSingleton()
+                      ->SendClearSessionCache();
+      });
+    }
+  }
+  DoClearSSLExternalAndInternalSessionCache();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNSSComponent::AsyncClearSSLExternalAndInternalSessionCache(
+    JSContext* aCx, ::mozilla::dom::Promise** aPromise) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  if (!XRE_IsParentProcess()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  nsIGlobalObject* globalObject = xpc::CurrentNativeGlobal(aCx);
+  if (NS_WARN_IF(!globalObject)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  ErrorResult result;
+  RefPtr<mozilla::dom::Promise> promise =
+      mozilla::dom::Promise::Create(globalObject, result);
+  if (NS_WARN_IF(result.Failed())) {
+    return result.StealNSResult();
+  }
+
+  if (mozilla::net::nsIOService::UseSocketProcess() &&
+      mozilla::net::gIOService) {
+    mozilla::net::gIOService->CallOrWaitForSocketProcess(
+        [p = RefPtr{promise}]() {
+          Unused << mozilla::net::SocketProcessParent::GetSingleton()
+                        ->SendClearSessionCache()
+                        ->Then(
+                            GetCurrentSerialEventTarget(), __func__,
+                            [promise = RefPtr{p}] {
+                              promise->MaybeResolveWithUndefined();
+                            },
+                            [promise = RefPtr{p}] {
+                              promise->MaybeReject(NS_ERROR_UNEXPECTED);
+                            });
+        });
+  } else {
+    promise->MaybeResolveWithUndefined();
+  }
+  DoClearSSLExternalAndInternalSessionCache();
+  promise.forget(aPromise);
+  return NS_OK;
+}
+
+namespace mozilla {
+namespace psm {
+
+already_AddRefed<SharedCertVerifier> GetDefaultCertVerifier() {
+  static NS_DEFINE_CID(kNSSComponentCID, NS_NSSCOMPONENT_CID);
+
+  nsCOMPtr<nsINSSComponent> nssComponent(do_GetService(kNSSComponentCID));
+  if (!nssComponent) {
+    return nullptr;
+  }
+  nsresult rv = nssComponent->BlockUntilLoadableCertsLoaded();
+  if (NS_FAILED(rv)) {
+    return nullptr;
+  }
+  RefPtr<SharedCertVerifier> result;
+  rv = nssComponent->GetDefaultCertVerifier(getter_AddRefs(result));
+  if (NS_FAILED(rv)) {
+    return nullptr;
+  }
+  return result.forget();
+}
+
+// Helper for FindClientCertificatesWithPrivateKeys. Copies all
+// CERTCertificates from `from` to `to`.
+static inline void CopyCertificatesTo(UniqueCERTCertList& from,
+                                      UniqueCERTCertList& to) {
+  MOZ_ASSERT(from);
+  MOZ_ASSERT(to);
+  for (CERTCertListNode* n = CERT_LIST_HEAD(from.get());
+       !CERT_LIST_END(n, from.get()); n = CERT_LIST_NEXT(n)) {
+    UniqueCERTCertificate cert(CERT_DupCertificate(n->cert));
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("      provisionally adding '%s'", n->cert->subjectName));
+    if (CERT_AddCertToListTail(to.get(), cert.get()) == SECSuccess) {
+      Unused << cert.release();
+    }
+  }
+}
+
+// Lists all private keys on all modules and returns a list of any corresponding
+// client certificates. Returns null if no such certificates can be found. Also
+// returns null if an error is encountered, because this is called as part of
+// the client auth data callback, and NSS ignores any errors returned by the
+// callback.
+UniqueCERTCertList FindClientCertificatesWithPrivateKeys() {
+  MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+          ("FindClientCertificatesWithPrivateKeys"));
+
+  BlockUntilLoadableCertsLoaded();
+
+  UniqueCERTCertList certsWithPrivateKeys(CERT_NewCertList());
+  if (!certsWithPrivateKeys) {
+    return nullptr;
+  }
+
+  UniquePK11SlotInfo internalSlot(PK11_GetInternalKeySlot());
+
+  AutoSECMODListReadLock secmodLock;
+  SECMODModuleList* list = SECMOD_GetDefaultModuleList();
+  while (list) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("  module '%s'", list->module->commonName));
+    for (int i = 0; i < list->module->slotCount; i++) {
+      PK11SlotInfo* slot = list->module->slots[i];
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+              ("    slot '%s'", PK11_GetSlotName(slot)));
+      // If this is the internal certificate/key slot or the slot on the
+      // builtin roots module, there may be many more certificates than private
+      // keys, so search by private keys (PK11_HasRootCerts will be true if the
+      // slot contains an object with the vendor-specific CK_CLASS
+      // CKO_NSS_BUILTIN_ROOT_LIST, which should only be the case for the NSS
+      // builtin roots module).
+      if (internalSlot.get() == slot || PK11_HasRootCerts(slot)) {
+        MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+                ("    (looking at internal/builtin slot)"));
+        if (PK11_Authenticate(slot, true, nullptr) != SECSuccess) {
+          MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("    (couldn't authenticate)"));
+          continue;
+        }
+        UniqueSECKEYPrivateKeyList privateKeys(
+            PK11_ListPrivKeysInSlot(slot, nullptr, nullptr));
+        if (!privateKeys) {
+          MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("      (no private keys)"));
+          continue;
+        }
+        for (SECKEYPrivateKeyListNode* node = PRIVKEY_LIST_HEAD(privateKeys);
+             !PRIVKEY_LIST_END(node, privateKeys);
+             node = PRIVKEY_LIST_NEXT(node)) {
+          UniqueCERTCertList certs(PK11_GetCertsMatchingPrivateKey(node->key));
+          if (!certs) {
+            MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+                    ("      PK11_GetCertsMatchingPrivateKey encountered an "
+                     "error "));
+            continue;
+          }
+          if (CERT_LIST_EMPTY(certs)) {
+            MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("      (no certs for key)"));
+            continue;
+          }
+          CopyCertificatesTo(certs, certsWithPrivateKeys);
+        }
+      } else {
+        // ... otherwise, optimistically assume that searching by certificate
+        // won't take too much time. Since "friendly" slots expose certificates
+        // without needing to be authenticated to, this results in fewer PIN
+        // dialogs shown to the user.
+        MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+                ("    (looking at non-internal slot)"));
+
+        if (!PK11_IsPresent(slot)) {
+          MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("    (not present)"));
+          continue;
+        }
+        // If this isn't a "friendly" slot, authenticate to expose certificates.
+        if (!PK11_IsFriendly(slot) &&
+            PK11_Authenticate(slot, true, nullptr) != SECSuccess) {
+          MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("    (couldn't authenticate)"));
+          continue;
+        }
+        UniqueCERTCertList certsInSlot(PK11_ListCertsInSlot(slot));
+        if (!certsInSlot) {
+          MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+                  ("      (couldn't list certs in slot)"));
+          continue;
+        }
+        // When NSS decodes a certificate, if that certificate has a
+        // corresponding private key (or public key, if the slot it's on hasn't
+        // been logged into), it notes it as a "user cert".
+        if (CERT_FilterCertListForUserCerts(certsInSlot.get()) != SECSuccess) {
+          MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+                  ("      (couldn't filter certs)"));
+          continue;
+        }
+        CopyCertificatesTo(certsInSlot, certsWithPrivateKeys);
+      }
+    }
+    list = list->next;
+  }
+
+  if (CERT_FilterCertListByUsage(certsWithPrivateKeys.get(), certUsageSSLClient,
+                                 false) != SECSuccess) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug,
+            ("  CERT_FilterCertListByUsage encountered an error - returning"));
+    return nullptr;
+  }
+
+  if (MOZ_UNLIKELY(MOZ_LOG_TEST(gPIPNSSLog, LogLevel::Debug))) {
+    MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("  returning:"));
+    for (CERTCertListNode* n = CERT_LIST_HEAD(certsWithPrivateKeys);
+         !CERT_LIST_END(n, certsWithPrivateKeys); n = CERT_LIST_NEXT(n)) {
+      MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("    %s", n->cert->subjectName));
+    }
+  }
+
+  if (CERT_LIST_EMPTY(certsWithPrivateKeys)) {
+    return nullptr;
+  }
+
+  return certsWithPrivateKeys;
+}
+
+}  // namespace psm
+}  // namespace mozilla
+
+NS_IMPL_ISUPPORTS(PipUIContext, nsIInterfaceRequestor)
+
+PipUIContext::PipUIContext() = default;
+
+PipUIContext::~PipUIContext() = default;
+
+NS_IMETHODIMP
+PipUIContext::GetInterface(const nsIID& uuid, void** result) {
+  NS_ENSURE_ARG_POINTER(result);
+  *result = nullptr;
+
+  if (!NS_IsMainThread()) {
+    NS_ERROR("PipUIContext::GetInterface called off the main thread");
+    return NS_ERROR_NOT_SAME_THREAD;
+  }
+
+  if (!uuid.Equals(NS_GET_IID(nsIPrompt))) return NS_ERROR_NO_INTERFACE;
+
+  nsIPrompt* prompt = nullptr;
+  nsresult rv = nsNSSComponent::GetNewPrompter(&prompt);
+  *result = prompt;
+  return rv;
+}
+
+nsresult getNSSDialogs(void** _result, REFNSIID aIID, const char* contract) {
+  if (!NS_IsMainThread()) {
+    NS_ERROR("getNSSDialogs called off the main thread");
+    return NS_ERROR_NOT_SAME_THREAD;
+  }
+
+  nsresult rv;
+
+  nsCOMPtr<nsISupports> svc = do_GetService(contract, &rv);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  rv = svc->QueryInterface(aIID, _result);
+
+  return rv;
+}
+
+nsresult setPassword(PK11SlotInfo* slot, nsIInterfaceRequestor* ctx) {
+  MOZ_ASSERT(slot);
+  MOZ_ASSERT(ctx);
+  NS_ENSURE_ARG_POINTER(slot);
+  NS_ENSURE_ARG_POINTER(ctx);
+
+  if (PK11_NeedUserInit(slot)) {
+    nsCOMPtr<nsITokenPasswordDialogs> dialogs;
+    nsresult rv = getNSSDialogs(getter_AddRefs(dialogs),
+                                NS_GET_IID(nsITokenPasswordDialogs),
+                                NS_TOKENPASSWORDSDIALOG_CONTRACTID);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    bool canceled;
+    nsCOMPtr<nsIPK11Token> token = new nsPK11Token(slot);
+    rv = dialogs->SetPassword(ctx, token, &canceled);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    if (canceled) {
+      return NS_ERROR_NOT_AVAILABLE;
+    }
+  }
+
+  return NS_OK;
+}
+
+static PRBool ConvertBetweenUCS2andASCII(PRBool toUnicode, unsigned char* inBuf,
+                                         unsigned int inBufLen,
+                                         unsigned char* outBuf,
+                                         unsigned int maxOutBufLen,
+                                         unsigned int* outBufLen,
+                                         PRBool swapBytes) {
+  std::unique_ptr<unsigned char[]> inBufDup(new unsigned char[inBufLen]);
+  if (!inBufDup) {
+    return PR_FALSE;
+  }
+  std::memcpy(inBufDup.get(), inBuf, inBufLen * sizeof(unsigned char));
+
+  // If converting Unicode to ASCII, swap bytes before conversion as neccessary.
+  if (!toUnicode && swapBytes) {
+    if (inBufLen % 2 != 0) {
+      return PR_FALSE;
+    }
+    mozilla::NativeEndian::swapFromLittleEndianInPlace(
+        reinterpret_cast<char16_t*>(inBufDup.get()), inBufLen / 2);
+  }
+  return PORT_UCS2_UTF8Conversion(toUnicode, inBufDup.get(), inBufLen, outBuf,
+                                  maxOutBufLen, outBufLen);
+}
+
+namespace mozilla {
+namespace psm {
+
+nsresult InitializeCipherSuite() {
+  MOZ_ASSERT(NS_IsMainThread(),
+             "InitializeCipherSuite() can only be accessed on the main thread");
+
+  if (NSS_SetDomesticPolicy() != SECSuccess) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // Disable any ciphers that NSS might have enabled by default
+  for (uint16_t i = 0; i < SSL_NumImplementedCiphers; ++i) {
+    uint16_t cipher_id = SSL_ImplementedCiphers[i];
+    SSL_CipherPrefSetDefault(cipher_id, false);
+  }
+
+  // Now only set SSL/TLS ciphers we knew about at compile time
+  for (const auto& cipherPref : sCipherPrefs) {
+    SSL_CipherPrefSetDefault(cipherPref.id, cipherPref.prefGetter());
+  }
+
+  SetDeprecatedTLS1CipherPrefs();
+
+  // Enable ciphers for PKCS#12
+  SEC_PKCS12EnableCipher(PKCS12_RC4_40, 1);
+  SEC_PKCS12EnableCipher(PKCS12_RC4_128, 1);
+  SEC_PKCS12EnableCipher(PKCS12_RC2_CBC_40, 1);
+  SEC_PKCS12EnableCipher(PKCS12_RC2_CBC_128, 1);
+  SEC_PKCS12EnableCipher(PKCS12_DES_56, 1);
+  SEC_PKCS12EnableCipher(PKCS12_DES_EDE3_168, 1);
+  SEC_PKCS12EnableCipher(PKCS12_AES_CBC_128, 1);
+  SEC_PKCS12EnableCipher(PKCS12_AES_CBC_192, 1);
+  SEC_PKCS12EnableCipher(PKCS12_AES_CBC_256, 1);
+  SEC_PKCS12SetPreferredCipher(PKCS12_DES_EDE3_168, 1);
+  PORT_SetUCS2_ASCIIConversionFunction(ConvertBetweenUCS2andASCII);
+
+  // PSM enforces a minimum RSA key size of 1024 bits, which is overridable.
+  // NSS has its own minimum, which is not overridable (the default is 1023
+  // bits). This sets the NSS minimum to 512 bits so users can still connect to
+  // devices like wifi routers with woefully small keys (they would have to add
+  // an override to do so, but they already do for such devices).
+  NSS_OptionSet(NSS_RSA_MIN_KEY_SIZE, 512);
+
+  // Observe preference change around cipher suite setting.
+  return CipherSuiteChangeObserver::StartObserve();
+}
+
+}  // namespace psm
+}  // namespace mozilla