Quelle OSReauthenticator.cpp Sprache: C

/* -*- 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 "OSReauthenticator.h"

#include "OSKeyStore.h"
#include "nsNetCID.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/Logging.h"
#include "mozilla/Maybe.h"
#include "mozilla/Preferences.h"
#include "nsComponentManagerUtils.h"
#include "nsIBaseWindow.h"
#include "nsIDocShell.h"
#include "nsISupportsUtils.h"
#include "nsIWidget.h"
#include "nsPIDOMWindow.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "mozilla/ipc/IPCTypes.h"

NS_IMPL_ISUPPORTS(OSReauthenticator, nsIOSReauthenticator)

extern mozilla::LazyLogModule gCredentialManagerSecretLog;

using mozilla::LogLevel;
using mozilla::Maybe;
using mozilla::Preferences;
using mozilla::WindowsHandle;
using mozilla::dom::Promise;

#define PREF_BLANK_PASSWORD "security.osreauthenticator.blank_password"
#define PREF_PASSWORD_LAST_CHANGED_LO \
  "security.osreauthenticator.password_last_changed_lo"
#define PREF_PASSWORD_LAST_CHANGED_HI \
  "security.osreauthenticator.password_last_changed_hi"

#if defined(XP_WIN)
#  include <combaseapi.h>
#  include <ntsecapi.h>
#  include <wincred.h>
#  include <windows.h>
#  include "nsIWindowsRegKey.h"  // Must be included after <windows.h> for HKEY definition
#  define SECURITY_WIN32
#  include <security.h>
#  include <shlwapi.h>
#  if !defined(__MINGW32__)
#    include <Lm.h>
#    undef ACCESS_READ  // nsWindowsRegKey defines its own ACCESS_READ
#  endif                // !defined(__MINGW32__)
struct HandleCloser {
  typedef HANDLE pointer;
  void operator()(HANDLE h) {
    if (h != INVALID_HANDLE_VALUE) {
      CloseHandle(h);
    }
  }
};
struct BufferFreer {
  typedef LPVOID pointer;
  ULONG mSize;
  explicit BufferFreer(ULONG size) : mSize(size) {}
  void operator()(LPVOID b) {
    SecureZeroMemory(b, mSize);
    CoTaskMemFree(b);
  }
};
struct LsaDeregistrator {
  typedef HANDLE pointer;
  void operator()(HANDLE h) {
    if (h != INVALID_HANDLE_VALUE) {
      LsaDeregisterLogonProcess(h);
    }
  }
};
typedef std::unique_ptr<HANDLE, HandleCloser> ScopedHANDLE;
typedef std::unique_ptr<LPVOID, BufferFreer> ScopedBuffer;
typedef std::unique_ptr<HANDLE, LsaDeregistrator> ScopedLsaHANDLE;

constexpr int64_t Int32Modulo = 2147483648;

// Get the token info holding the sid.
std::unique_ptr<char[]> GetTokenInfo(ScopedHANDLE& token) {
  DWORD length = 0;
  // https://docs.microsoft.com/en-us/windows/desktop/api/securitybaseapi/nf-securitybaseapi-gettokeninformation
  mozilla::Unused << GetTokenInformation(token.get(), TokenUser, nullptr, 0,
                                         &length);
  if (!length || GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
    MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
            ("Unable to obtain current token info."));
    return nullptr;
  }
  std::unique_ptr<char[]> token_info(new char[length]);
  if (!GetTokenInformation(token.get(), TokenUser, token_info.get(), length,
                           &length)) {
    MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
            ("Unable to obtain current token info (second call, possible "
             "system error."));
    return nullptr;
  }
  return token_info;
}

std::unique_ptr<char[]> GetUserTokenInfo() {
  // Get current user sid to make sure the same user got logged in.
  HANDLE token;
  if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token)) {
    // Couldn't get a process token. This will fail any unlock attempts later.
    MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
            ("Unable to obtain process token."));
    return nullptr;
  }
  ScopedHANDLE scopedToken(token);
  return GetTokenInfo(scopedToken);
}

Maybe<int64_t> GetPasswordLastChanged(const WCHAR* username) {
#  if defined(__MINGW32__)
  // NetUserGetInfo requires Lm.h which is not provided in MinGW builds
  return mozilla::Nothing();
#  else
  LPUSER_INFO_1 user_info = NULL;
  DWORD passwordAgeInSeconds = 0;

  NET_API_STATUS ret =
      NetUserGetInfo(NULL, username, 1, reinterpret_cast<LPBYTE*>(&user_info));

  if (ret == NERR_Success) {
    // Returns seconds since last password change.
    passwordAgeInSeconds = user_info->usri1_password_age;
    NetApiBufferFree(user_info);
  } else {
    return mozilla::Nothing();
  }

  // Return the time that the password was changed so we can use this
  // for future comparisons.
  return mozilla::Some(PR_Now() - passwordAgeInSeconds * PR_USEC_PER_SEC);
#  endif
}

bool IsAutoAdminLogonEnabled() {
  // https://support.microsoft.com/en-us/help/324737/how-to-turn-on-automatic-logon-in-windows
  nsresult rv;
  nsCOMPtr<nsIWindowsRegKey> regKey =
      do_CreateInstance("@mozilla.org/windows-registry-key;1", &rv);
  if (NS_FAILED(rv)) {
    return false;
  }

  rv = regKey->Open(
      nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
      nsLiteralString(
          u"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon"),
      nsIWindowsRegKey::ACCESS_READ);
  if (NS_FAILED(rv)) {
    return false;
  }

  nsAutoString value;
  rv = regKey->ReadStringValue(u"AutoAdminLogon"_ns, value);
  if (NS_FAILED(rv)) {
    return false;
  }
  regKey->Close();

  return value.Equals(u"1"_ns);
}

bool IsRequireSignonEnabled() {
  // https://docs.microsoft.com/en-us/windows-hardware/customize/power-settings/no-subgroup-settings-prompt-for-password-on-resume
  nsresult rv;
  nsCOMPtr<nsIWindowsRegKey> regKey =
      do_CreateInstance("@mozilla.org/windows-registry-key;1", &rv);
  if (NS_FAILED(rv)) {
    return true;
  }

  rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                    u"System\\CurrentControlSet\\Control\\Power\\User\\Power"
                    "Schemes"_ns,
                    nsIWindowsRegKey::ACCESS_READ);
  if (NS_FAILED(rv)) {
    return true;
  }

  nsAutoString activePowerScheme;
  rv = regKey->ReadStringValue(u"ActivePowerScheme"_ns, activePowerScheme);
  if (NS_FAILED(rv)) {
    return true;
  }
  regKey->Close();

  rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE,
                    u"System\\CurrentControlSet\\Control\\Power\\User\\Power"
                    "Schemes\\"_ns +
                        activePowerScheme +
                        u"\\0e796bdb-100d-47d6-a2d5-f7d2daa51f51"_ns,
                    nsIWindowsRegKey::ACCESS_READ);
  if (NS_FAILED(rv)) {
    return true;
  }

  uint32_t value;
  rv = regKey->ReadIntValue(u"ACSettingIndex"_ns, &value);
  if (NS_FAILED(rv)) {
    return true;
  }
  regKey->Close();

  return !!value;
}

// Use the Windows credential prompt to ask the user to authenticate the
// currently used account.
static nsresult ReauthenticateUserWindows(
    const nsAString& aMessageText, const nsAString& aCaptionText,
    const WindowsHandle& hwndParent,
    /* out */ bool& reauthenticated,
    /* inout */ bool& isBlankPassword,
    /* inout */ int64_t& prefLastChanged,
    /* out */ bool& isAutoAdminLogonEnabled,
    /* out */ bool& isRequireSignonEnabled) {
  reauthenticated = false;
  isAutoAdminLogonEnabled = false;
  isRequireSignonEnabled = true;

  // Check if the user has a blank password before proceeding
  DWORD usernameLength = CREDUI_MAX_USERNAME_LENGTH + 1;
  WCHAR username[CREDUI_MAX_USERNAME_LENGTH + 1] = {0};

  if (!GetUserNameEx(NameSamCompatible, username, &usernameLength)) {
    MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
            ("Error getting username"));
    return NS_ERROR_FAILURE;
  }

  if (!IsOS(OS_DOMAINMEMBER)) {
    const WCHAR* usernameNoDomain = username;
    // Don't include the domain portion of the username when calling LogonUser.
    LPCWSTR backslash = wcschr(username, L'\\');
    if (backslash) {
      usernameNoDomain = backslash + 1;
    }

    Maybe<int64_t> lastChanged = GetPasswordLastChanged(usernameNoDomain);
    if (lastChanged.isSome()) {
      bool shouldCheckAgain = lastChanged.value() > prefLastChanged;
      // Update the value stored in preferences
      prefLastChanged = lastChanged.value();

      if (shouldCheckAgain) {
        HANDLE logonUserHandle = INVALID_HANDLE_VALUE;
        bool result =
            LogonUser(usernameNoDomain, L".", L"", LOGON32_LOGON_INTERACTIVE,
                      LOGON32_PROVIDER_DEFAULT, &logonUserHandle);
        if (result) {
          CloseHandle(logonUserHandle);
        }
        // ERROR_ACCOUNT_RESTRICTION: Indicates a referenced user name and
        // authentication information are valid, but some user account
        // restriction has prevented successful authentication (such as
        // time-of-day restrictions).
        reauthenticated = isBlankPassword =
            (result || GetLastError() == ERROR_ACCOUNT_RESTRICTION);
      } else if (isBlankPassword) {
        reauthenticated = true;
      }

      if (reauthenticated) {
        return NS_OK;
      }
    } else {
      isBlankPassword = false;
    }
  } else {
    // Update any preferences, assuming domain members do not have blank
    // passwords
    isBlankPassword = false;
  }

  isAutoAdminLogonEnabled = IsAutoAdminLogonEnabled();

  isRequireSignonEnabled = IsRequireSignonEnabled();

  // Is used in next iteration if the previous login failed.
  DWORD err = 0;
  std::unique_ptr<char[]> userTokenInfo = GetUserTokenInfo();

  // CredUI prompt.
  CREDUI_INFOW credui = {};
  credui.cbSize = sizeof(credui);
  credui.hwndParent = reinterpret_cast<HWND>(hwndParent);
  const nsString& messageText = PromiseFlatString(aMessageText);
  credui.pszMessageText = messageText.get();
  const nsString& captionText = PromiseFlatString(aCaptionText);
  credui.pszCaptionText = captionText.get();
  credui.hbmBanner = nullptr;  // ignored

  while (!reauthenticated) {
    HANDLE lsa = INVALID_HANDLE_VALUE;
    // Get authentication handle for future user authentications.
    // https://docs.microsoft.com/en-us/windows/desktop/api/ntsecapi/nf-ntsecapi-lsaconnectuntrusted
    if (LsaConnectUntrusted(&lsa) != ERROR_SUCCESS) {
      MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
              ("Error acquiring lsa. Authentication attempts will fail."));
      return NS_ERROR_FAILURE;
    }
    ScopedLsaHANDLE scopedLsa(lsa);

    if (!userTokenInfo || lsa == INVALID_HANDLE_VALUE) {
      MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
              ("Error setting up login and user token."));
      return NS_ERROR_FAILURE;
    }

    ULONG authPackage = 0;
    ULONG outCredSize = 0;
    LPVOID outCredBuffer = nullptr;

    // Get user's Windows credentials.
    // https://docs.microsoft.com/en-us/windows/desktop/api/wincred/nf-wincred-creduipromptforwindowscredentialsw
    err = CredUIPromptForWindowsCredentialsW(
        &credui, err, &authPackage, nullptr, 0, &outCredBuffer, &outCredSize,
        nullptr, CREDUIWIN_ENUMERATE_CURRENT_USER);
    ScopedBuffer scopedOutCredBuffer(outCredBuffer, BufferFreer(outCredSize));
    if (err == ERROR_CANCELLED) {
      MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
              ("Error getting authPackage for user login, user cancel."));
      return NS_OK;
    }
    if (err != ERROR_SUCCESS) {
      MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
              ("Error getting authPackage for user login."));
      return NS_ERROR_FAILURE;
    }

    // Verify the credentials.
    TOKEN_SOURCE source;
    PCHAR contextName = const_cast<PCHAR>("Mozilla");
    size_t nameLength =
        std::min(TOKEN_SOURCE_LENGTH, static_cast<int>(strlen(contextName)));
    // Note that the string must not be longer than TOKEN_SOURCE_LENGTH.
    memcpy(source.SourceName, contextName, nameLength);
    // https://docs.microsoft.com/en-us/windows/desktop/api/securitybaseapi/nf-securitybaseapi-allocatelocallyuniqueid
    if (!AllocateLocallyUniqueId(&source.SourceIdentifier)) {
      MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
              ("Error allocating ID for logon process."));
      return NS_ERROR_FAILURE;
    }

    NTSTATUS substs;
    void* profileBuffer = nullptr;
    ULONG profileBufferLength = 0;
    QUOTA_LIMITS limits = {0};
    LUID luid;
    HANDLE token = INVALID_HANDLE_VALUE;
    LSA_STRING name;
    name.Buffer = contextName;
    name.Length = strlen(name.Buffer);
    name.MaximumLength = name.Length;
    // https://docs.microsoft.com/en-us/windows/desktop/api/ntsecapi/nf-ntsecapi-lsalogonuser
    NTSTATUS sts = LsaLogonUser(
        scopedLsa.get(), &name, (SECURITY_LOGON_TYPE)Interactive, authPackage,
        scopedOutCredBuffer.get(), outCredSize, nullptr, &source,
        &profileBuffer, &profileBufferLength, &luid, &token, &limits, &substs);
    ScopedHANDLE scopedToken(token);
    LsaFreeReturnBuffer(profileBuffer);
    if (sts == ERROR_SUCCESS) {
      MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
              ("User logged in successfully."));
    } else {
      err = LsaNtStatusToWinError(sts);
      MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
              ("Login failed with %lx (%lx).", sts, err));
      continue;
    }

    // The user can select any user to log-in on the authentication prompt.
    // Make sure that the logged in user is the current user.
    std::unique_ptr<char[]> logonTokenInfo = GetTokenInfo(scopedToken);
    if (!logonTokenInfo) {
      MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
              ("Error getting logon token info."));
      return NS_ERROR_FAILURE;
    }
    PSID logonSID =
        reinterpret_cast<TOKEN_USER*>(logonTokenInfo.get())->User.Sid;
    PSID userSID = reinterpret_cast<TOKEN_USER*>(userTokenInfo.get())->User.Sid;
    if (EqualSid(userSID, logonSID)) {
      MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
              ("Login successfully (correct user)."));
      reauthenticated = true;
      break;
    } else {
      err = ERROR_LOGON_FAILURE;
    }
  }
  return NS_OK;
}
#endif  // XP_WIN

static nsresult ReauthenticateUser(const nsAString& prompt,
                                   const nsAString& caption,
                                   const WindowsHandle& hwndParent,
                                   /* out */ bool& reauthenticated,
                                   /* inout */ bool& isBlankPassword,
                                   /* inout */ int64_t& prefLastChanged,
                                   /* out */ bool& isAutoAdminLogonEnabled,
                                   /* out */ bool& isRequireSignonEnabled) {
  reauthenticated = false;
#if defined(XP_WIN)
  return ReauthenticateUserWindows(
      prompt, caption, hwndParent, reauthenticated, isBlankPassword,
      prefLastChanged, isAutoAdminLogonEnabled, isRequireSignonEnabled);
#elif defined(XP_MACOSX)
  return ReauthenticateUserMacOS(prompt, reauthenticated, isBlankPassword);
#else
  return NS_OK;
#endif  // Reauthentication is not implemented for this platform.
}

static void BackgroundReauthenticateUser(RefPtr<Promise>& aPromise,
                                         const nsAString& aMessageText,
                                         const nsAString& aCaptionText,
                                         const WindowsHandle& hwndParent,
                                         bool isBlankPassword,
                                         int64_t prefLastChanged) {
  nsAutoCString recovery;
  bool reauthenticated;
  bool isAutoAdminLogonEnabled;
  bool isRequireSignonEnabled;
  nsresult rv = ReauthenticateUser(
      aMessageText, aCaptionText, hwndParent, reauthenticated, isBlankPassword,
      prefLastChanged, isAutoAdminLogonEnabled, isRequireSignonEnabled);

  nsTArray<int32_t> prefLastChangedUpdates;
#if defined(XP_WIN)
  // Increase the lastChanged time to account for clock skew.
  prefLastChanged += PR_USEC_PER_SEC;
  // Need to split the 64bit integer to its hi and lo bits before sending it
  // back to JS.
  int32_t prefLastChangedHi = prefLastChanged / Int32Modulo;
  int32_t prefLastChangedLo = prefLastChanged % Int32Modulo;
  prefLastChangedUpdates.AppendElement(prefLastChangedHi);
  prefLastChangedUpdates.AppendElement(prefLastChangedLo);
#endif

  nsTArray<int32_t> results;
  results.AppendElement(reauthenticated);
  results.AppendElement(isBlankPassword);
#if defined(XP_WIN)
  results.AppendElement(isAutoAdminLogonEnabled);
  results.AppendElement(isRequireSignonEnabled);
#endif
  nsCOMPtr<nsIRunnable> runnable(NS_NewRunnableFunction(
      "BackgroundReauthenticateUserResolve",
      [rv, results = std::move(results),
       prefLastChangedUpdates = std::move(prefLastChangedUpdates),
       aPromise = std::move(aPromise)]() {
        if (NS_FAILED(rv)) {
          aPromise->MaybeReject(rv);
        } else {
          aPromise->MaybeResolve(results);
        }

        nsresult rv = Preferences::SetBool(PREF_BLANK_PASSWORD, results[1]);
        if (NS_FAILED(rv)) {
          return;
        }
        if (prefLastChangedUpdates.Length() > 1) {
          rv = Preferences::SetInt(PREF_PASSWORD_LAST_CHANGED_HI,
                                   prefLastChangedUpdates[0]);
          if (NS_FAILED(rv)) {
            return;
          }
          Preferences::SetInt(PREF_PASSWORD_LAST_CHANGED_LO,
                              prefLastChangedUpdates[1]);
        }
      }));
  NS_DispatchToMainThread(runnable.forget());
}

NS_IMETHODIMP
OSReauthenticator::AsyncReauthenticateUser(const nsAString& aMessageText,
                                           const nsAString& aCaptionText,
                                           mozIDOMWindow* aParentWindow,
                                           JSContext* aCx,
                                           Promise** promiseOut) {
  NS_ENSURE_ARG_POINTER(aCx);

  RefPtr<Promise> promiseHandle;
  nsresult rv = GetPromise(aCx, promiseHandle);
  if (NS_FAILED(rv)) {
    return rv;
  }

  WindowsHandle hwndParent = 0;
  if (aParentWindow) {
    nsPIDOMWindowInner* win = nsPIDOMWindowInner::From(aParentWindow);
    nsIDocShell* docShell = win->GetDocShell();
    if (docShell) {
      nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(docShell);
      if (baseWindow) {
        nsCOMPtr<nsIWidget> widget;
        baseWindow->GetMainWidget(getter_AddRefs(widget));
        if (widget) {
          hwndParent = reinterpret_cast<WindowsHandle>(
              widget->GetNativeData(NS_NATIVE_WINDOW));
        }
      }
    }
  }

  int64_t prefLastChanged = 0;
  bool isBlankPassword = false;
#if defined(XP_WIN)
  // These preferences are only supported on Windows.
  // Preferences are read/write main-thread only.
  int32_t prefLastChangedLo;
  int32_t prefLastChangedHi;
  rv = Preferences::GetBool(PREF_BLANK_PASSWORD, &isBlankPassword);
  if (NS_FAILED(rv)) {
    return rv;
  }
  rv = Preferences::GetInt(PREF_PASSWORD_LAST_CHANGED_LO, &prefLastChangedLo);
  if (NS_FAILED(rv)) {
    return rv;
  }
  rv = Preferences::GetInt(PREF_PASSWORD_LAST_CHANGED_HI, &prefLastChangedHi);
  if (NS_FAILED(rv)) {
    return rv;
  }
  prefLastChanged = prefLastChangedHi * Int32Modulo + prefLastChangedLo;
#endif

  nsCOMPtr<nsIRunnable> runnable(NS_NewRunnableFunction(
      "BackgroundReauthenticateUser",
      [promiseHandle, aMessageText = nsAutoString(aMessageText),
       aCaptionText = nsAutoString(aCaptionText), hwndParent, isBlankPassword,
       prefLastChanged]() mutable {
        BackgroundReauthenticateUser(promiseHandle, aMessageText, aCaptionText,
                                     hwndParent, isBlankPassword,
                                     prefLastChanged);
      }));

  nsCOMPtr<nsIEventTarget> target(
      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID));
  if (!target) {
    return NS_ERROR_FAILURE;
  }
  rv = target->Dispatch(runnable, NS_DISPATCH_NORMAL);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  promiseHandle.forget(promiseOut);
  return NS_OK;
}

quality99%

¤ Dauer der Verarbeitung: 0.16 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.