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Add SHA256 checking of the authentity of used modules

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In order to remove the code signing certificate dependency, SHA256 checking of the authentity of used modules (Scilexer.dll, GUP.exe and nppPluginList.dll) is added.
See the followling link for the detail information:
https://notepad-plus-plus.org/community/topic/17184/remove-code-signing-from-notepad
This commit is contained in:
Don HO 2019-02-27 10:14:36 +01:00
parent 1f5ba1803f
commit 3baef49079
6 changed files with 139 additions and 73 deletions
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117
PowerEditor/src/MISC/Common/verifySignedfile.cpp
View File

@ -38,16 +38,61 @@
#include <iomanip>
#include "VerifySignedFile.h"
#include "Common.h"
#include "sha-256.h"
using namespace std;
bool VerifySignedLibrary(const wstring& filepath,
const wstring& cert_key_id_hex,
const wstring& cert_subject,
const wstring& cert_display_name,
bool doCheckRevocation,
bool doCheckChainOfTrust,
bool displayErrorMessage)
SecurityMode SecurityGard::_securityMode = sm_sha256;
//SecurityMode SecurityGard::_securityMode = sm_certif;
SecurityGard::SecurityGard()
{
_scilexerSha256.push_back(TEXT("03c9177631d2b32de3d32c73a8841cf68fc2cb17f306825489dc3df98000db85")); // v3.5.6 32 bit
_scilexerSha256.push_back(TEXT("9896c4089275e21412fd80421827912ebd80e357394b05145a613d190462e211")); // v3.5.6 64 bit
_gupSha256.push_back(TEXT("4c8191f511c2ad67148ef809b40c1108aaa074130547157c335a959404d8d6f6")); // v5.1 32 bit
_gupSha256.push_back(TEXT("268a65829e86d5c3d324eea79b51e59f0a7d07c69d3ba0f700c9cb3aa772566f")); // v5.1 64 bit
}
bool SecurityGard::checkModule(std::wstring filePath, NppModule module2check)
{
if (_securityMode == sm_certif)
return verifySignedLibrary(filePath, module2check);
else if (_securityMode == sm_sha256)
return checkSha256(filePath, module2check);
else
return false;
}
bool SecurityGard::checkSha256(std::wstring filePath, NppModule module2check)
{
std::string content = getFileContent(filePath.c_str());
uint8_t sha2hash[32];
calc_sha_256(sha2hash, reinterpret_cast<const uint8_t*>(content.c_str()), content.length());
wchar_t sha2hashStr[65] = { '\0' };
for (size_t i = 0; i < 32; i++)
wsprintf(sha2hashStr + i * 2, TEXT("%02x"), sha2hash[i]);
std::vector<std::wstring>* moduleSha256 = nullptr;
if (module2check == nm_scilexer)
moduleSha256 = &_scilexerSha256;
else if (module2check == nm_gup)
moduleSha256 = &_gupSha256;
else if (module2check == nm_pluginList)
moduleSha256 = &_pluginListSha256;
else
return false;
for (auto i : *moduleSha256)
if (i == sha2hashStr)
return true;
return false;
}
bool SecurityGard::verifySignedLibrary(const std::wstring& filepath, NppModule module2check)
{
wstring display_name;
wstring key_id_hex;
@ -78,7 +123,7 @@ bool VerifySignedLibrary(const wstring& filepath,
winTEXTrust_data.fdwRevocationChecks = WTD_REVOKE_WHOLECHAIN; // verify the whole certificate chain
winTEXTrust_data.pFile = &file_data;
if (!doCheckRevocation)
if (!_doCheckRevocation)
{
winTEXTrust_data.fdwRevocationChecks = WTD_REVOKE_NONE;
OutputDebugString(TEXT("VerifyLibrary: certificate revocation checking is disabled\n"));
@ -102,7 +147,7 @@ bool VerifySignedLibrary(const wstring& filepath,
}
}
if (doCheckChainOfTrust)
if (_doCheckChainOfTrust)
{
// Verify signature and cert-chain validity
GUID policy = WINTRUST_ACTION_GENERIC_VERIFY_V2;
@ -143,37 +188,37 @@ bool VerifySignedLibrary(const wstring& filepath,
if (!result)
{
throw wstring( TEXT("Checking certificate of ") ) + filepath + TEXT(" : ") + GetLastErrorAsString(GetLastError());
throw wstring(TEXT("Checking certificate of ")) + filepath + TEXT(" : ") + GetLastErrorAsString(GetLastError());
}
// Get signer information size.
result = ::CryptMsgGetParam(hMsg, CMSG_SIGNER_INFO_PARAM, 0, NULL, &dwSignerInfo);
if (!result)
{
throw wstring( TEXT("CryptMsgGetParam first call: ")) + GetLastErrorAsString(GetLastError());
throw wstring(TEXT("CryptMsgGetParam first call: ")) + GetLastErrorAsString(GetLastError());
}
// Get Signer Information.
pSignerInfo = (PCMSG_SIGNER_INFO)LocalAlloc(LPTR, dwSignerInfo);
if (NULL == pSignerInfo )
if (NULL == pSignerInfo)
{
throw wstring( TEXT("Failed to allocate memory for signature processing"));
throw wstring(TEXT("Failed to allocate memory for signature processing"));
}
result = ::CryptMsgGetParam(hMsg, CMSG_SIGNER_INFO_PARAM, 0, (PVOID)pSignerInfo, &dwSignerInfo);
if (!result)
{
throw wstring( TEXT("CryptMsgGetParam: ")) + GetLastErrorAsString(GetLastError());
throw wstring(TEXT("CryptMsgGetParam: ")) + GetLastErrorAsString(GetLastError());
}
// Get the signer certificate from temporary certificate store.
CERT_INFO cert_info = { 0 };
cert_info.Issuer = pSignerInfo->Issuer;
cert_info.SerialNumber = pSignerInfo->SerialNumber;
PCCERT_CONTEXT context = ::CertFindCertificateInStore( hStore, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0, CERT_FIND_SUBJECT_CERT, (PVOID)&cert_info, NULL);
PCCERT_CONTEXT context = ::CertFindCertificateInStore(hStore, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0, CERT_FIND_SUBJECT_CERT, (PVOID)&cert_info, NULL);
if (!context)
{
throw wstring( TEXT("Certificate context: ")) + GetLastErrorAsString(GetLastError());
throw wstring(TEXT("Certificate context: ")) + GetLastErrorAsString(GetLastError());
}
// Getting the full subject
@ -192,15 +237,15 @@ bool VerifySignedLibrary(const wstring& filepath,
// Getting key_id
DWORD key_id_sze = 0;
if (!::CertGetCertificateContextProperty( context, CERT_KEY_IDENTIFIER_PROP_ID, NULL, &key_id_sze))
if (!::CertGetCertificateContextProperty(context, CERT_KEY_IDENTIFIER_PROP_ID, NULL, &key_id_sze))
{
throw wstring( TEXT("x509 property not found")) + GetLastErrorAsString(GetLastError());
throw wstring(TEXT("x509 property not found")) + GetLastErrorAsString(GetLastError());
}
std::unique_ptr<BYTE[]> key_id_buff( new BYTE[key_id_sze] );
if (!::CertGetCertificateContextProperty( context, CERT_KEY_IDENTIFIER_PROP_ID, key_id_buff.get(), &key_id_sze))
std::unique_ptr<BYTE[]> key_id_buff(new BYTE[key_id_sze]);
if (!::CertGetCertificateContextProperty(context, CERT_KEY_IDENTIFIER_PROP_ID, key_id_buff.get(), &key_id_sze))
{
throw wstring( TEXT("Getting certificate property problem.")) + GetLastErrorAsString(GetLastError());
throw wstring(TEXT("Getting certificate property problem.")) + GetLastErrorAsString(GetLastError());
}
wstringstream ss;
@ -211,32 +256,34 @@ bool VerifySignedLibrary(const wstring& filepath,
}
key_id_hex = ss.str();
wstring dbg = key_id_hex + TEXT("\n");
OutputDebugString( dbg.c_str() );
OutputDebugString(dbg.c_str());
// Getting the display name
auto sze = ::CertGetNameString( context, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, NULL, NULL, 0);
auto sze = ::CertGetNameString(context, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, NULL, NULL, 0);
if (sze <= 1)
{
throw wstring( TEXT("Getting data size problem.")) + GetLastErrorAsString(GetLastError());
throw wstring(TEXT("Getting data size problem.")) + GetLastErrorAsString(GetLastError());
}
// Get display name.
std::unique_ptr<TCHAR[]> display_name_buffer( new TCHAR[sze] );
if (::CertGetNameString( context, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, NULL, display_name_buffer.get(), sze) <= 1)
std::unique_ptr<TCHAR[]> display_name_buffer(new TCHAR[sze]);
if (::CertGetNameString(context, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0, NULL, display_name_buffer.get(), sze) <= 1)
{
throw wstring( TEXT("Cannot get certificate info.")) + GetLastErrorAsString(GetLastError());
throw wstring(TEXT("Cannot get certificate info.")) + GetLastErrorAsString(GetLastError());
}
display_name = display_name_buffer.get();
} catch (const wstring& s) {
if (displayErrorMessage)
}
catch (const wstring& s) {
if (module2check == nm_scilexer)
::MessageBox(NULL, s.c_str(), TEXT("DLL signature verification failed"), MB_ICONERROR);
OutputDebugString(TEXT("VerifyLibrary: error while getting certificate informations\n"));
status = false;
} catch (...) {
}
catch (...) {
// Unknown error
OutputDebugString(TEXT("VerifyLibrary: error while getting certificate informations\n"));
if (displayErrorMessage)
if (module2check == nm_scilexer)
{
wstring errMsg(TEXT("Unknown exception occurred. "));
errMsg += GetLastErrorAsString(GetLastError());
@ -248,19 +295,19 @@ bool VerifySignedLibrary(const wstring& filepath,
//
// fields verifications - if status is true, and string to compare (from the parameter) is not empty, then do compare
//
if ( status && !cert_display_name.empty() && cert_display_name != display_name )
if (status && _signer_display_name != display_name)
{
status = false;
OutputDebugString(TEXT("VerifyLibrary: Invalid certificate display name\n"));
}
if ( status && !cert_subject.empty() && cert_subject != subject)
if (status && _signer_subject != subject)
{
status = false;
OutputDebugString(TEXT("VerifyLibrary: Invalid certificate subject\n"));
}
if ( status && !cert_key_id_hex.empty() && cert_key_id_hex != key_id_hex )
if (status && _signer_key_id != key_id_hex)
{
status = false;
OutputDebugString(TEXT("VerifyLibrary: Invalid certificate key id\n"));
@ -274,5 +321,3 @@ bool VerifySignedLibrary(const wstring& filepath,
return status;
}
#undef VerifySignedLibrary_DISABLE_REVOCATION_CHECK

42
PowerEditor/src/MISC/Common/verifySignedfile.h
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@ -26,9 +26,6 @@
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#pragma once
//#define VerifySignedLibrary_DISABLE_REVOCATION_CHECK "Dont check certificat revocation"
/*
@ -57,17 +54,36 @@
* state of the certificates will *not* be checked.
*
*/
#pragma once
#include <string>
#include <vector>
#define NPP_COMPONENT_SIGNER_DISPLAY_NAME TEXT("Notepad++")
#define NPP_COMPONENT_SIGNER_SUBJECT TEXT("C=FR, S=Ile-de-France, L=Saint Cloud, O=\"Notepad++\", CN=\"Notepad++\"")
#define NPP_COMPONENT_SIGNER_KEY_ID TEXT("42C4C5846BB675C74E2B2C90C69AB44366401093")
enum SecurityMode { sm_certif = 0, sm_sha256 = 1 };
enum NppModule { nm_scilexer = 0, nm_gup = 1, nm_pluginList = 2 };
class SecurityGard final
{
public:
SecurityGard();
bool checkModule(std::wstring filePath, NppModule module2check);
private:
// SHA256
static SecurityMode _securityMode;
std::vector<std::wstring> _scilexerSha256;
std::vector<std::wstring> _gupSha256;
std::vector<std::wstring> _pluginListSha256;
bool checkSha256(std::wstring filePath, NppModule module2check);
// Code signing certificate
std::wstring _signer_display_name = TEXT("Notepad++");
std::wstring _signer_subject = TEXT("C=FR, S=Ile-de-France, L=Saint Cloud, O=\"Notepad++\", CN=\"Notepad++\"");
std::wstring _signer_key_id = TEXT("42C4C5846BB675C74E2B2C90C69AB44366401093");
bool _doCheckRevocation = false;
bool _doCheckChainOfTrust = false;
bool verifySignedLibrary(const std::wstring& filepath, NppModule module2check);
};
bool VerifySignedLibrary(const std::wstring& filepath,
const std::wstring& key_id_hex,
const std::wstring& cert_subject,
const std::wstring& display_name,
bool doCheckRevocation,
bool doCheckChainOfTrust,
bool displayErrorMessage = true);

3
PowerEditor/src/NppCommands.cpp
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@ -2823,7 +2823,8 @@ void Notepad_plus::command(int id)
bool isCertifVerified = true;
#else //RELEASE
// check the signature on updater
bool isCertifVerified = VerifySignedLibrary(updaterFullPath.c_str(), NPP_COMPONENT_SIGNER_KEY_ID, NPP_COMPONENT_SIGNER_SUBJECT, NPP_COMPONENT_SIGNER_DISPLAY_NAME, false, false, false);
SecurityGard securityGard;
bool isCertifVerified = securityGard.checkModule(updaterFullPath, nm_gup);
#endif
if (isCertifVerified)
{

5
PowerEditor/src/ScitillaComponent/ScintillaEditView.cpp
View File

@ -206,12 +206,13 @@ HMODULE loadSciLexerDll()
// This is helpful for developers to skip signature checking
// while analyzing issue or modifying the lexer dll
#ifndef _DEBUG
bool isOK = VerifySignedLibrary(sciLexerPath, NPP_COMPONENT_SIGNER_KEY_ID, NPP_COMPONENT_SIGNER_SUBJECT, NPP_COMPONENT_SIGNER_DISPLAY_NAME, false, false);
SecurityGard securityGard;
bool isOK = securityGard.checkModule(sciLexerPath, nm_scilexer);
if (!isOK)
{
::MessageBox(NULL,
TEXT("Authenticode check failed: signature or signing certificate are not recognized"),
TEXT("Authenticode check failed:\rsigning certificate or hash is not recognized"),
TEXT("Library verification failed"),
MB_OK | MB_ICONERROR);
return nullptr;

6
PowerEditor/src/WinControls/PluginsAdmin/pluginsAdmin.cpp
View File

@ -714,11 +714,13 @@ bool PluginsAdminDlg::isValide()
// check the signature on default location : %APPDATA%\Notepad++\plugins\config\pl\nppPluginList.dll or NPP_INST_DIR\plugins\config\pl\nppPluginList.dll
bool isOK = VerifySignedLibrary(_pluginListFullPath.c_str(), NPP_COMPONENT_SIGNER_KEY_ID, NPP_COMPONENT_SIGNER_SUBJECT, NPP_COMPONENT_SIGNER_DISPLAY_NAME, false, false, false);
SecurityGard securityGard;
bool isOK = securityGard.checkModule(_pluginListFullPath, nm_pluginList);
if (!isOK)
return isOK;
isOK = VerifySignedLibrary(_updaterFullPath.c_str(), NPP_COMPONENT_SIGNER_KEY_ID, NPP_COMPONENT_SIGNER_SUBJECT, NPP_COMPONENT_SIGNER_DISPLAY_NAME, false, false, false);
isOK = securityGard.checkModule(_updaterFullPath, nm_gup);
return isOK;
#endif
}

3
PowerEditor/src/winmain.cpp
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@ -494,7 +494,8 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
winVer ver = pNppParameters->getWinVersion();
bool isGtXP = ver > WV_XP;
bool isSignatureOK = VerifySignedLibrary(updaterFullPath.c_str(), NPP_COMPONENT_SIGNER_KEY_ID, NPP_COMPONENT_SIGNER_SUBJECT, NPP_COMPONENT_SIGNER_DISPLAY_NAME, false, false, false);
SecurityGard securityGard;
bool isSignatureOK = securityGard.checkModule(updaterFullPath, nm_gup);
if (TheFirstOne && isUpExist && doUpdate && isGtXP && isSignatureOK)
{