/
verify.c
1814 lines (1540 loc) · 52.9 KB
/
verify.c
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/*
* Copyright (c) 2022 Winsider Seminars & Solutions, Inc. All rights reserved.
*
* This file is part of System Informer.
*
* Authors:
*
* wj32 2009-2013
* dmex 2016-2023
*
*/
#define PH_ENABLE_VERIFY_CACHE
#include <ph.h>
#include <appresolver.h>
#include <mapldr.h>
#define CERT_CHAIN_PARA_HAS_EXTRA_FIELDS
#include <wintrust.h>
#include <softpub.h>
#include <verify.h>
#include <verifyp.h>
_CryptCATAdminCalcHashFromFileHandle CryptCATAdminCalcHashFromFileHandle;
_CryptCATAdminCalcHashFromFileHandle2 CryptCATAdminCalcHashFromFileHandle2;
_CryptCATAdminAcquireContext CryptCATAdminAcquireContext;
_CryptCATAdminAcquireContext2 CryptCATAdminAcquireContext2;
_CryptCATAdminEnumCatalogFromHash CryptCATAdminEnumCatalogFromHash;
_CryptCATCatalogInfoFromContext CryptCATCatalogInfoFromContext;
_CryptCATAdminReleaseCatalogContext CryptCATAdminReleaseCatalogContext;
_CryptCATAdminReleaseContext CryptCATAdminReleaseContext;
//_WTHelperProvDataFromStateData WTHelperProvDataFromStateData_I;
//_WTHelperGetProvSignerFromChain WTHelperGetProvSignerFromChain_I;
_WinVerifyTrust WinVerifyTrust_I;
_CertNameToStr CertNameToStr_I;
_CertGetEnhancedKeyUsage CertGetEnhancedKeyUsage_I;
_CertDuplicateCertificateContext CertDuplicateCertificateContext_I;
_CertFreeCertificateContext CertFreeCertificateContext_I;
static PH_INITONCE PhpVerifyInitOnce = PH_INITONCE_INIT;
static CONST GUID WinTrustActionGenericVerifyV2 = WINTRUST_ACTION_GENERIC_VERIFY_V2;
static CONST GUID DriverActionVerify = DRIVER_ACTION_VERIFY;
#ifdef PH_ENABLE_VERIFY_CACHE
static PPH_HASHTABLE PhpVerifyCacheHashTable = NULL;
static PH_QUEUED_LOCK PhpVerifyCacheLock = PH_QUEUED_LOCK_INIT;
#endif
static VOID PhpVerifyInitialization(
VOID
)
{
PVOID wintrust;
PVOID crypt32;
wintrust = PhLoadLibrary(L"wintrust.dll");
crypt32 = PhLoadLibrary(L"crypt32.dll");
if (wintrust)
{
CryptCATAdminCalcHashFromFileHandle = PhGetDllBaseProcedureAddress(wintrust, "CryptCATAdminCalcHashFromFileHandle", 0);
CryptCATAdminCalcHashFromFileHandle2 = PhGetDllBaseProcedureAddress(wintrust, "CryptCATAdminCalcHashFromFileHandle2", 0);
CryptCATAdminAcquireContext = PhGetDllBaseProcedureAddress(wintrust, "CryptCATAdminAcquireContext", 0);
CryptCATAdminAcquireContext2 = PhGetDllBaseProcedureAddress(wintrust, "CryptCATAdminAcquireContext2", 0);
CryptCATAdminEnumCatalogFromHash = PhGetDllBaseProcedureAddress(wintrust, "CryptCATAdminEnumCatalogFromHash", 0);
CryptCATCatalogInfoFromContext = PhGetDllBaseProcedureAddress(wintrust, "CryptCATCatalogInfoFromContext", 0);
CryptCATAdminReleaseCatalogContext = PhGetDllBaseProcedureAddress(wintrust, "CryptCATAdminReleaseCatalogContext", 0);
CryptCATAdminReleaseContext = PhGetDllBaseProcedureAddress(wintrust, "CryptCATAdminReleaseContext", 0);
//WTHelperProvDataFromStateData_I = PhGetDllBaseProcedureAddress(wintrust, "WTHelperProvDataFromStateData", 0);
//WTHelperGetProvSignerFromChain_I = PhGetDllBaseProcedureAddress(wintrust, "WTHelperGetProvSignerFromChain", 0);
WinVerifyTrust_I = PhGetDllBaseProcedureAddress(wintrust, "WinVerifyTrust", 0);
}
if (crypt32)
{
CertNameToStr_I = PhGetDllBaseProcedureAddress(crypt32, "CertNameToStrW", 0);
CertGetEnhancedKeyUsage_I = PhGetDllBaseProcedureAddress(crypt32, "CertGetEnhancedKeyUsage", 0);
CertDuplicateCertificateContext_I = PhGetDllBaseProcedureAddress(crypt32, "CertDuplicateCertificateContext", 0);
CertFreeCertificateContext_I = PhGetDllBaseProcedureAddress(crypt32, "CertFreeCertificateContext", 0);
}
if (
CryptCATAdminCalcHashFromFileHandle &&
CryptCATAdminAcquireContext &&
CryptCATAdminEnumCatalogFromHash &&
CryptCATCatalogInfoFromContext &&
CryptCATAdminReleaseCatalogContext &&
CryptCATAdminReleaseContext &&
WinVerifyTrust_I &&
CertNameToStr_I &&
CertDuplicateCertificateContext_I &&
CertFreeCertificateContext_I
)
{
PhpVerifyCacheHashTable = PhCreateHashtable(
sizeof(PH_VERIFY_CACHE_ENTRY),
PhpVerifyCacheHashtableEqualFunction,
PhpVerifyCacheHashtableHashFunction,
100
);
}
}
VERIFY_RESULT PhpStatusToVerifyResult(
_In_ LONG Status
)
{
switch (Status)
{
case 0:
return VrTrusted;
case TRUST_E_NOSIGNATURE:
return VrNoSignature;
case CERT_E_EXPIRED:
return VrExpired;
case CERT_E_REVOKED:
return VrRevoked;
case TRUST_E_EXPLICIT_DISTRUST:
return VrDistrust;
case CRYPT_E_SECURITY_SETTINGS:
return VrSecuritySettings;
case TRUST_E_BAD_DIGEST:
return VrBadSignature;
default:
return VrSecuritySettings;
}
}
// WTHelperProvDataFromStateData (dmex)
PCRYPT_PROVIDER_DATA PhGetCryptProviderDataFromStateData(
_In_ HANDLE StateData
)
{
return (PCRYPT_PROVIDER_DATA)StateData;
}
// WTHelperGetProvSignerFromChain (dmex)
PCRYPT_PROVIDER_SGNR PhGetCryptProviderSignerFromChain(
_In_ PCRYPT_PROVIDER_DATA ProvData,
_In_ ULONG SignerIndex,
_In_ BOOLEAN CounterSigner,
_In_ ULONG CounterSignerIndex
)
{
PCRYPT_PROVIDER_SGNR signer;
if (!ProvData || SignerIndex >= ProvData->csSigners)
return NULL;
signer = &ProvData->pasSigners[SignerIndex];
if (CounterSigner)
{
if (CounterSignerIndex < signer->csCounterSigners)
{
return &signer->pasCounterSigners[CounterSignerIndex];
}
}
return signer;
}
// rev from WTHelperIsChainedToMicrosoft (dmex)
BOOLEAN PhIsChainedToMicrosoft(
_In_ PCCERT_CONTEXT Certificate,
_In_ HCERTSTORE SiblingStore,
_In_ BOOLEAN IncludeMicrosoftTestRootCerts
)
{
static PH_INITONCE initOnce = PH_INITONCE_INIT;
static HCERTSTORE (WINAPI* CertOpenStore_I)(
_In_ LPCSTR lpszStoreProvider,
_In_ ULONG dwEncodingType,
_In_opt_ HCRYPTPROV_LEGACY hCryptProv,
_In_ ULONG dwFlags,
_In_opt_ const void* pvPara
) = NULL;
static BOOL (WINAPI* CertAddStoreToCollection_I)(
_In_ HCERTSTORE hCollectionStore,
_In_opt_ HCERTSTORE hSiblingStore,
_In_ ULONG dwUpdateFlags,
_In_ ULONG dwPriority
) = NULL;
static BOOL (WINAPI* CertGetCertificateChain_I)(
_In_opt_ HCERTCHAINENGINE hChainEngine,
_In_ PCCERT_CONTEXT pCertContext,
_In_opt_ LPFILETIME pTime,
_In_opt_ HCERTSTORE hAdditionalStore,
_In_ PCERT_CHAIN_PARA pChainPara,
_In_ ULONG dwFlags,
_Reserved_ LPVOID pvReserved,
_Out_ PCCERT_CHAIN_CONTEXT * ppChainContext
) = NULL;
static BOOL (WINAPI* CertVerifyCertificateChainPolicy_I)(
_In_ LPCSTR pszPolicyOID,
_In_ PCCERT_CHAIN_CONTEXT pChainContext,
_In_ PCERT_CHAIN_POLICY_PARA pPolicyPara,
_Inout_ PCERT_CHAIN_POLICY_STATUS pPolicyStatus
) = NULL;
static VOID (WINAPI* CertFreeCertificateChain_I)(
_In_ PCCERT_CHAIN_CONTEXT pChainContext
) = NULL;
static BOOL (WINAPI* CertCloseStore_I)(
_In_opt_ HCERTSTORE hCertStore,
_In_ ULONG dwFlags
) = NULL;
BOOLEAN status = FALSE;
HCERTSTORE cryptStoreHandle;
CERT_CHAIN_POLICY_PARA policyPara = { sizeof(CERT_CHAIN_POLICY_PARA) };
CERT_CHAIN_POLICY_STATUS policyStatus = { sizeof(CERT_CHAIN_POLICY_STATUS) };
CERT_CHAIN_PARA chainPara = { sizeof(CERT_CHAIN_PARA) };
PCCERT_CHAIN_CONTEXT chainContext;
if (!(Certificate && SiblingStore))
return FALSE;
if (PhBeginInitOnce(&initOnce))
{
PVOID crypt32;
if (crypt32 = PhLoadLibrary(L"crypt32.dll"))
{
CertOpenStore_I = PhGetDllBaseProcedureAddress(crypt32, "CertOpenStore", 0);
CertAddStoreToCollection_I = PhGetDllBaseProcedureAddress(crypt32, "CertAddStoreToCollection", 0);
CertGetCertificateChain_I = PhGetDllBaseProcedureAddress(crypt32, "CertGetCertificateChain", 0);
CertVerifyCertificateChainPolicy_I = PhGetDllBaseProcedureAddress(crypt32, "CertVerifyCertificateChainPolicy", 0);
CertFreeCertificateChain_I = PhGetDllBaseProcedureAddress(crypt32, "CertFreeCertificateChain", 0);
CertCloseStore_I = PhGetDllBaseProcedureAddress(crypt32, "CertCloseStore", 0);
}
PhEndInitOnce(&initOnce);
}
if (!(
CertOpenStore_I &&
CertAddStoreToCollection_I &&
CertGetCertificateChain_I &&
CertVerifyCertificateChainPolicy_I &&
CertFreeCertificateChain_I &&
CertCloseStore_I
))
{
return FALSE;
}
if (cryptStoreHandle = CertOpenStore_I(CERT_STORE_PROV_COLLECTION, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0, 0, 0))
{
if (CertAddStoreToCollection_I(cryptStoreHandle, SiblingStore, 0, 0))
{
//if (IncludeMicrosoftTestRootCerts)
//{
// PVOID wintrust = PhGetLoaderEntryDllBaseZ(L"wintrust.dll");
// ULONG resourceLength;
// PVOID resourceBuffer;
//
// policyPara.dwFlags = MICROSOFT_ROOT_CERT_CHAIN_POLICY_ENABLE_TEST_ROOT_FLAG;
//
// if (PhLoadResource(wintrust, MAKEINTRESOURCE(1), L"MSTESTROOT", &resourceLength, &resourceBuffer))
// {
// CERT_BLOB certificateBlob = { resourceLength, resourceBuffer };
// HCERTSTORE siblingStore = NULL;
//
// if (CryptQueryObject(
// CERT_QUERY_OBJECT_BLOB,
// &certificateBlob,
// CERT_QUERY_CONTENT_FLAG_CERT,
// CERT_QUERY_FORMAT_FLAG_ALL,
// 0, 0, 0, 0,
// &siblingStore,
// 0,
// 0
// ))
// {
// CertAddStoreToCollection(cryptStoreHandle, siblingStore, 0, 0);
// }
// }
//
// if (PhLoadResource(wintrust, MAKEINTRESOURCE(2), L"MSTESTROOT", &resourceLength, &resourceBuffer))
// {
// CERT_BLOB certificateBlob = { resourceLength, resourceBuffer };
// HCERTSTORE siblingStore = NULL;
//
// if (CryptQueryObject(
// CERT_QUERY_OBJECT_BLOB,
// &certificateBlob,
// CERT_QUERY_CONTENT_FLAG_CERT,
// CERT_QUERY_FORMAT_FLAG_ALL,
// 0, 0, 0, 0,
// &siblingStore,
// 0,
// 0
// ))
// {
// CertAddStoreToCollection(cryptStoreHandle, siblingStore, 0, 0);
// }
// }
//}
if (CertGetCertificateChain_I(
HCCE_CURRENT_USER,
Certificate,
0,
cryptStoreHandle,
&chainPara,
0,
0,
&chainContext
))
{
if (CertVerifyCertificateChainPolicy_I(
CERT_CHAIN_POLICY_MICROSOFT_ROOT,
chainContext,
&policyPara,
&policyStatus
))
{
status = (policyStatus.dwError == ERROR_SUCCESS);
}
CertFreeCertificateChain_I(chainContext);
}
}
CertCloseStore_I(cryptStoreHandle, 0);
}
return status;
}
_Success_(return)
BOOLEAN PhpGetSignaturesFromStateData(
_In_ HANDLE StateData,
_Out_ PCERT_CONTEXT **Signatures,
_Out_ PULONG NumberOfSignatures
)
{
PCRYPT_PROVIDER_DATA provData;
PCRYPT_PROVIDER_SGNR sgnr;
PCERT_CONTEXT *signatures;
ULONG i;
ULONG numberOfSignatures;
ULONG index;
provData = PhGetCryptProviderDataFromStateData(StateData);
if (!provData)
{
*Signatures = NULL;
*NumberOfSignatures = 0;
return FALSE;
}
i = 0;
numberOfSignatures = 0;
while (sgnr = PhGetCryptProviderSignerFromChain(provData, i, FALSE, 0))
{
if (sgnr->csCertChain != 0)
numberOfSignatures++;
i++;
}
if (numberOfSignatures != 0)
{
signatures = PhAllocate(numberOfSignatures * sizeof(PCERT_CONTEXT));
i = 0;
index = 0;
while (sgnr = PhGetCryptProviderSignerFromChain(provData, i, FALSE, 0))
{
if (sgnr->csCertChain != 0)
signatures[index++] = (PCERT_CONTEXT)CertDuplicateCertificateContext_I(sgnr->pasCertChain[0].pCert);
i++;
}
}
else
{
signatures = NULL;
}
*Signatures = signatures;
*NumberOfSignatures = numberOfSignatures;
return TRUE;
}
VOID PhpViewSignerInfo(
_In_ PPH_VERIFY_FILE_INFO Information,
_In_ HANDLE StateData
)
{
static PH_INITONCE initOnce = PH_INITONCE_INIT;
static _CryptUIDlgViewSignerInfo cryptUIDlgViewSignerInfo;
if (PhBeginInitOnce(&initOnce))
{
HMODULE cryptui;
if (cryptui = PhLoadLibrary(L"cryptui.dll"))
{
cryptUIDlgViewSignerInfo = PhGetDllBaseProcedureAddress(cryptui, "CryptUIDlgViewSignerInfoW", 0);
}
PhEndInitOnce(&initOnce);
}
if (cryptUIDlgViewSignerInfo)
{
CRYPTUI_VIEWSIGNERINFO_STRUCT viewSignerInfo = { sizeof(CRYPTUI_VIEWSIGNERINFO_STRUCT) };
PCRYPT_PROVIDER_DATA provData;
PCRYPT_PROVIDER_SGNR sgnr;
if (!(provData = PhGetCryptProviderDataFromStateData(StateData)))
return;
if (!(sgnr = PhGetCryptProviderSignerFromChain(provData, 0, FALSE, 0)))
return;
viewSignerInfo.hwndParent = Information->hWnd;
viewSignerInfo.pSignerInfo = sgnr->psSigner;
viewSignerInfo.hMsg = provData->hMsg;
viewSignerInfo.pszOID = szOID_PKIX_KP_CODE_SIGNING;
cryptUIDlgViewSignerInfo(&viewSignerInfo);
}
}
VERIFY_RESULT PhpVerifyFile(
_In_ PPH_VERIFY_FILE_INFO Information,
_In_ ULONG UnionChoice,
_In_ PVOID UnionData,
_In_ PCGUID ActionId,
_In_opt_ PVOID PolicyCallbackData,
_Out_ PCERT_CONTEXT **Signatures,
_Out_ PULONG NumberOfSignatures
)
{
LONG status;
WINTRUST_DATA trustData;
memset(&trustData, 0, sizeof(WINTRUST_DATA));
trustData.cbStruct = sizeof(WINTRUST_DATA);
trustData.pPolicyCallbackData = PolicyCallbackData;
trustData.dwUIChoice = WTD_UI_NONE;
trustData.fdwRevocationChecks = WTD_REVOKE_WHOLECHAIN;
trustData.dwUnionChoice = UnionChoice;
trustData.dwStateAction = WTD_STATEACTION_VERIFY;
trustData.dwProvFlags = WTD_SAFER_FLAG | WTD_DISABLE_MD2_MD4;
trustData.pFile = UnionData;
if (UnionChoice == WTD_CHOICE_CATALOG)
trustData.pCatalog = UnionData;
if (Information->Flags & PH_VERIFY_PREVENT_NETWORK_ACCESS)
{
trustData.fdwRevocationChecks = WTD_REVOKE_NONE;
trustData.dwProvFlags |= WTD_CACHE_ONLY_URL_RETRIEVAL;
}
status = WinVerifyTrust_I(INVALID_HANDLE_VALUE, ActionId, &trustData);
PhpGetSignaturesFromStateData(trustData.hWVTStateData, Signatures, NumberOfSignatures);
if (status == 0 && (Information->Flags & PH_VERIFY_VIEW_PROPERTIES))
PhpViewSignerInfo(Information, trustData.hWVTStateData);
// Close the state data.
trustData.dwStateAction = WTD_STATEACTION_CLOSE;
WinVerifyTrust_I(INVALID_HANDLE_VALUE, ActionId, &trustData);
return PhpStatusToVerifyResult(status);
}
_Success_(return)
BOOLEAN PhpCalculateFileHash(
_In_ HANDLE FileHandle,
_In_opt_ PCWSTR HashAlgorithm,
_Out_ PUCHAR *FileHash,
_Out_ PULONG FileHashLength,
_Out_ HANDLE *CatAdminHandle
)
{
HANDLE catAdminHandle;
PUCHAR fileHash;
ULONG fileHashLength;
if (CryptCATAdminAcquireContext2)
{
if (!CryptCATAdminAcquireContext2(&catAdminHandle, &DriverActionVerify, HashAlgorithm, NULL, 0))
return FALSE;
}
else
{
if (!CryptCATAdminAcquireContext(&catAdminHandle, &DriverActionVerify, 0))
return FALSE;
}
fileHashLength = 32;
fileHash = PhAllocate(fileHashLength);
if (CryptCATAdminCalcHashFromFileHandle2)
{
if (!CryptCATAdminCalcHashFromFileHandle2(catAdminHandle, FileHandle, &fileHashLength, fileHash, 0))
{
PhFree(fileHash);
fileHash = PhAllocate(fileHashLength);
if (!CryptCATAdminCalcHashFromFileHandle2(catAdminHandle, FileHandle, &fileHashLength, fileHash, 0))
{
CryptCATAdminReleaseContext(catAdminHandle, 0);
PhFree(fileHash);
return FALSE;
}
}
}
else
{
if (!CryptCATAdminCalcHashFromFileHandle(FileHandle, &fileHashLength, fileHash, 0))
{
PhFree(fileHash);
fileHash = PhAllocate(fileHashLength);
if (!CryptCATAdminCalcHashFromFileHandle(FileHandle, &fileHashLength, fileHash, 0))
{
CryptCATAdminReleaseContext(catAdminHandle, 0);
PhFree(fileHash);
return FALSE;
}
}
}
*FileHash = fileHash;
*FileHashLength = fileHashLength;
*CatAdminHandle = catAdminHandle;
return TRUE;
}
_Success_(return)
BOOLEAN PhpVerifyGetHashFromFileHandle(
_In_ HANDLE FileHandle,
_In_opt_ PCWSTR HashAlgorithm,
_Out_writes_bytes_(HashTagLength) PWSTR HashTagBuffer,
_In_ ULONG HashTagLength,
_Out_writes_bytes_to_(*FileHashLength, *FileHashLength) PUCHAR FileHashBuffer,
_Inout_ PULONG FileHashLength,
_Out_ HANDLE *CatAdminHandle
)
{
HANDLE catAdminHandle;
if (CryptCATAdminAcquireContext2)
{
if (!CryptCATAdminAcquireContext2(&catAdminHandle, &DriverActionVerify, HashAlgorithm, NULL, 0))
return FALSE;
}
else
{
if (!CryptCATAdminAcquireContext(&catAdminHandle, &DriverActionVerify, 0))
return FALSE;
}
if (CryptCATAdminCalcHashFromFileHandle2)
{
if (!CryptCATAdminCalcHashFromFileHandle2(catAdminHandle, FileHandle, FileHashLength, FileHashBuffer, 0))
{
CryptCATAdminReleaseContext(catAdminHandle, 0);
return FALSE;
}
}
else
{
if (!CryptCATAdminCalcHashFromFileHandle(FileHandle, FileHashLength, FileHashBuffer, 0))
{
CryptCATAdminReleaseContext(catAdminHandle, 0);
return FALSE;
}
}
if (!PhBufferToHexStringBuffer(FileHashBuffer, *FileHashLength, TRUE, HashTagBuffer, HashTagLength, NULL))
{
CryptCATAdminReleaseContext(catAdminHandle, 0);
return FALSE;
}
*CatAdminHandle = catAdminHandle;
return TRUE;
}
VERIFY_RESULT PhpVerifyFileFromCatalog(
_In_ PPH_VERIFY_FILE_INFO Information,
_In_ HANDLE FileHandle,
_In_opt_ PCWSTR HashAlgorithm,
_Out_ PCERT_CONTEXT **Signatures,
_Out_ PULONG NumberOfSignatures
)
{
VERIFY_RESULT verifyResult = VrUnknown;
PCERT_CONTEXT *signatures;
ULONG numberOfSignatures;
WINTRUST_CATALOG_INFO catalogInfo;
LARGE_INTEGER fileSize;
ULONG fileSizeLimit;
ULONG fileHashLength = 32; // bytes
UCHAR fileHash[32];
ULONG fileHashTagLength = 128; // wchar
WCHAR fileHashTag[64 + 1];
HANDLE catAdminHandle;
HANDLE catInfoHandle;
*Signatures = NULL;
*NumberOfSignatures = 0;
if (!NT_SUCCESS(PhGetFileSize(FileHandle, &fileSize)))
return VrNoSignature;
signatures = NULL;
numberOfSignatures = 0;
if (Information->FileSizeLimitForHash != ULONG_MAX)
{
fileSizeLimit = PH_VERIFY_DEFAULT_SIZE_LIMIT;
if (Information->FileSizeLimitForHash != 0)
fileSizeLimit = Information->FileSizeLimitForHash;
if (fileSize.QuadPart > fileSizeLimit)
return VrNoSignature;
}
if (!PhpVerifyGetHashFromFileHandle(
FileHandle,
HashAlgorithm,
fileHashTag,
fileHashTagLength,
fileHash,
&fileHashLength,
&catAdminHandle
))
return VrBadSignature;
// Search the system catalogs.
catInfoHandle = CryptCATAdminEnumCatalogFromHash(
catAdminHandle,
fileHash,
fileHashLength,
0,
NULL
);
if (catInfoHandle)
{
CATALOG_INFO ci = { sizeof(CATALOG_INFO) };
DRIVER_VER_INFO verInfo = { 0 };
if (CryptCATCatalogInfoFromContext(catInfoHandle, &ci, 0))
{
// Disable OS version checking by passing in a DRIVER_VER_INFO structure.
verInfo.cbStruct = sizeof(DRIVER_VER_INFO);
memset(&catalogInfo, 0, sizeof(catalogInfo));
catalogInfo.cbStruct = sizeof(catalogInfo);
catalogInfo.pcwszCatalogFilePath = ci.wszCatalogFile;
catalogInfo.pcwszMemberFilePath = NULL; // Information->FileName
catalogInfo.hMemberFile = FileHandle;
catalogInfo.pcwszMemberTag = fileHashTag;
catalogInfo.pbCalculatedFileHash = fileHash;
catalogInfo.cbCalculatedFileHash = fileHashLength;
catalogInfo.hCatAdmin = catAdminHandle;
verifyResult = PhpVerifyFile(Information, WTD_CHOICE_CATALOG, &catalogInfo, &DriverActionVerify, &verInfo, &signatures, &numberOfSignatures);
if (verInfo.pcSignerCertContext)
CertFreeCertificateContext_I(verInfo.pcSignerCertContext);
}
CryptCATAdminReleaseCatalogContext(catAdminHandle, catInfoHandle, 0);
}
else
{
// Search any user-supplied catalogs.
for (ULONG i = 0; i < Information->NumberOfCatalogFileNames; i++)
{
PhFreeVerifySignatures(signatures, numberOfSignatures);
memset(&catalogInfo, 0, sizeof(catalogInfo));
catalogInfo.cbStruct = sizeof(catalogInfo);
catalogInfo.pcwszCatalogFilePath = Information->CatalogFileNames[i];
catalogInfo.pcwszMemberFilePath = NULL; // Information->FileName
catalogInfo.hMemberFile = FileHandle;
catalogInfo.pcwszMemberTag = fileHashTag;
catalogInfo.pbCalculatedFileHash = fileHash;
catalogInfo.cbCalculatedFileHash = fileHashLength;
catalogInfo.hCatAdmin = catAdminHandle;
verifyResult = PhpVerifyFile(Information, WTD_CHOICE_CATALOG, &catalogInfo, &WinTrustActionGenericVerifyV2, NULL, &signatures, &numberOfSignatures);
if (verifyResult == VrTrusted)
break;
}
}
CryptCATAdminReleaseContext(catAdminHandle, 0);
*Signatures = signatures;
*NumberOfSignatures = numberOfSignatures;
return verifyResult;
}
NTSTATUS PhVerifyFileEx(
_In_ PPH_VERIFY_FILE_INFO Information,
_Out_ VERIFY_RESULT *VerifyResult,
_Out_opt_ PCERT_CONTEXT **Signatures,
_Out_opt_ PULONG NumberOfSignatures
)
{
VERIFY_RESULT verifyResult;
PCERT_CONTEXT *signatures;
ULONG numberOfSignatures;
WINTRUST_FILE_INFO fileInfo;
if (PhBeginInitOnce(&PhpVerifyInitOnce))
{
PhpVerifyInitialization();
PhEndInitOnce(&PhpVerifyInitOnce);
}
if (!PhpVerifyCacheHashTable)
return STATUS_NOT_SUPPORTED;
memset(&fileInfo, 0, sizeof(WINTRUST_FILE_INFO));
fileInfo.cbStruct = sizeof(WINTRUST_FILE_INFO);
fileInfo.pgKnownSubject = (PGUID)&WINTRUST_KNOWN_SUBJECT_PE_IMAGE;
fileInfo.hFile = Information->FileHandle;
verifyResult = PhpVerifyFile(
Information,
WTD_CHOICE_FILE,
&fileInfo,
&WinTrustActionGenericVerifyV2,
NULL,
&signatures,
&numberOfSignatures
);
if (verifyResult == VrNoSignature)
{
if (CryptCATAdminAcquireContext2 && CryptCATAdminCalcHashFromFileHandle2)
{
PhFreeVerifySignatures(signatures, numberOfSignatures);
verifyResult = PhpVerifyFileFromCatalog(
Information,
Information->FileHandle,
BCRYPT_SHA256_ALGORITHM,
&signatures,
&numberOfSignatures
);
}
if (verifyResult != VrTrusted)
{
PhFreeVerifySignatures(signatures, numberOfSignatures);
verifyResult = PhpVerifyFileFromCatalog(
Information,
Information->FileHandle,
BCRYPT_SHA1_ALGORITHM,
&signatures,
&numberOfSignatures
);
if (verifyResult == VrUnknown)
verifyResult = VrNoSignature;
}
}
*VerifyResult = verifyResult;
if (Signatures)
*Signatures = signatures;
else
PhFreeVerifySignatures(signatures, numberOfSignatures);
if (NumberOfSignatures)
*NumberOfSignatures = numberOfSignatures;
return STATUS_SUCCESS;
}
VOID PhFreeVerifySignatures(
_In_opt_ PCERT_CONTEXT *Signatures,
_In_ ULONG NumberOfSignatures
)
{
ULONG i;
if (Signatures)
{
for (i = 0; i < NumberOfSignatures; i++)
CertFreeCertificateContext_I(Signatures[i]);
PhFree(Signatures);
}
}
PPH_STRING PhpGetCertNameString(
_In_ PCERT_NAME_BLOB Blob
)
{
PPH_STRING string;
ULONG bufferSize;
// CertNameToStr doesn't give us the correct buffer size unless we don't provide a buffer at
// all.
bufferSize = CertNameToStr_I(
X509_ASN_ENCODING,
Blob,
CERT_X500_NAME_STR,
NULL,
0
);
string = PhCreateStringEx(NULL, bufferSize * sizeof(WCHAR));
CertNameToStr_I(
X509_ASN_ENCODING,
Blob,
CERT_X500_NAME_STR,
string->Buffer,
bufferSize
);
if (string->Length > sizeof(UNICODE_NULL))
string->Length -= sizeof(UNICODE_NULL);
// PhTrimToNullTerminatorString(string);
return string;
}
PPH_STRING PhpGetX500Value(
_In_ PPH_STRINGREF String,
_In_ PPH_STRINGREF KeyName
)
{
WCHAR keyNamePlusEqualsBuffer[10];
PH_STRINGREF keyNamePlusEquals;
SIZE_T keyNameLength;
PH_STRINGREF firstPart;
PH_STRINGREF remainingPart;
keyNameLength = KeyName->Length / sizeof(WCHAR);
assert(!(keyNameLength > sizeof(keyNamePlusEquals) / sizeof(WCHAR) - 1));
keyNamePlusEquals.Buffer = keyNamePlusEqualsBuffer;
keyNamePlusEquals.Length = (keyNameLength + 1) * sizeof(WCHAR);
memcpy(keyNamePlusEquals.Buffer, KeyName->Buffer, KeyName->Length);
keyNamePlusEquals.Buffer[keyNameLength] = L'=';
// Find "Key=".
if (!PhSplitStringRefAtString(String, &keyNamePlusEquals, FALSE, &firstPart, &remainingPart))
return NULL;
if (remainingPart.Length == 0)
return NULL;
// Is the value quoted? If so, return the part inside the quotes.
if (remainingPart.Buffer[0] == L'"')
{
PhSkipStringRef(&remainingPart, sizeof(WCHAR));
if (!PhSplitStringRefAtChar(&remainingPart, L'"', &firstPart, &remainingPart))
return NULL;
return PhCreateString2(&firstPart);
}
else
{
PhSplitStringRefAtChar(&remainingPart, L',', &firstPart, &remainingPart);
return PhCreateString2(&firstPart);
}
}
PPH_STRING PhGetSignerNameFromCertificate(
_In_ PCERT_CONTEXT Certificate
)
{
PCERT_INFO certInfo;
PH_STRINGREF keyName;
PPH_STRING name;
PPH_STRING value;
// Cert context -> Cert info
certInfo = Certificate->pCertInfo;
if (!certInfo)
return NULL;
// Cert info subject -> Subject X.500 string
name = PhpGetCertNameString(&certInfo->Subject);
// Subject X.500 string -> CN or OU value
PhInitializeStringRef(&keyName, L"CN");
value = PhpGetX500Value(&name->sr, &keyName);
if (!value)
{
PhInitializeStringRef(&keyName, L"OU");
value = PhpGetX500Value(&name->sr, &keyName);
}
PhDereferenceObject(name);
return value;
}
BOOLEAN PhGetSystemComponentFromCertificate(
_In_ PCERT_CONTEXT Certificate
)
{
BOOLEAN found;
UCHAR usageBuffer[256];
ULONG usageLength = sizeof(usageBuffer);
PCERT_ENHKEY_USAGE usage = (PCERT_ENHKEY_USAGE)usageBuffer;
if (!CertGetEnhancedKeyUsage_I(Certificate, CERT_FIND_EXT_ONLY_ENHKEY_USAGE_FLAG, usage, &usageLength))
{
assert(FALSE);
return FALSE;
}
found = FALSE;
for (ULONG i = 0; i < usage->cUsageIdentifier; i++)
{
if (PhEqualBytesZ(usage->rgpszUsageIdentifier[i], szOID_NT5_CRYPTO, FALSE)) // Windows System Component Verification (dmex)
{
found = TRUE;
break;
}
}
return found;
}
PH_STRINGREF PhVerifyResultToStringRef(
_In_ VERIFY_RESULT Result
)
{
static PH_STRINGREF Results[] =
{
{ 0, NULL },
PH_STRINGREF_INIT(L"No signature"),
PH_STRINGREF_INIT(L"Trusted"),
PH_STRINGREF_INIT(L"Expired certificate"),
PH_STRINGREF_INIT(L"Revoked certificate"),
PH_STRINGREF_INIT(L"Not trusted"),
PH_STRINGREF_INIT(L"Security policy failure"),
PH_STRINGREF_INIT(L"Invalid hash"),
};
if (Result < RTL_NUMBER_OF(Results))
return Results[Result];
else
return Results[0];
}
/**
* Verifies a file's digital signature.
*
* \param FileName A file name.
* \param SignerName A variable which receives a pointer to a string containing the signer name. You
* must free the string using PhDereferenceObject() when you no longer need it. Note that the signer
* name may be NULL if it is not valid.
*
* \return A VERIFY_RESULT value.
*/
VERIFY_RESULT PhVerifyFile(
_In_ PWSTR FileName,
_Out_opt_ PPH_STRING *SignerName
)
{
PH_VERIFY_FILE_INFO info = { 0 };
HANDLE fileHandle;
VERIFY_RESULT verifyResult;
PCERT_CONTEXT *signatures;
ULONG numberOfSignatures;
if (!NT_SUCCESS(PhCreateFileWin32(
&fileHandle,
FileName,
FILE_READ_DATA | FILE_READ_ATTRIBUTES | SYNCHRONIZE,
FILE_ATTRIBUTE_NORMAL,
FILE_SHARE_READ | FILE_SHARE_DELETE,
FILE_OPEN,