3 files changed, 611 insertions, 0 deletions
diff --git a/other-licenses/nsis/Contrib/CertCheck/CertCheck.cpp b/other-licenses/nsis/Contrib/CertCheck/CertCheck.cpp
new file mode 100644
index 0000000000..e79f19a615
--- /dev/null
+++ b/other-licenses/nsis/Contrib/CertCheck/CertCheck.cpp
@@ -0,0 +1,411 @@
+/* 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 <stdio.h>
+#include <stdlib.h>
+#include <windows.h>
+#include <softpub.h>
+#include <wintrust.h>
+
+#pragma comment(lib, "wintrust.lib")
+#pragma comment(lib, "crypt32.lib")
+
+#ifndef UNICODE
+#error "This file only supports building in Unicode mode"
+#endif
+
+static const int ENCODING = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING;
+
+// The definitions for NSPIM, the callback typedef, and
+// extra_parameters all come from the NSIS plugin API source.
+enum NSPIM
+{
+  NSPIM_UNLOAD,
+  NSPIM_GUIUNLOAD,
+};
+
+typedef UINT_PTR(*NSISPLUGINCALLBACK)(enum NSPIM);
+
+struct extra_parameters
+{
+  // The real type of exec_flags is exec_flags_t*, which is a large struct
+  // whose definition is omitted here because this plugin doesn't need it.
+  void* exec_flags;
+  int (__stdcall *ExecuteCodeSegment)(int, HWND);
+  void (__stdcall *validate_filename)(TCHAR*);
+  int (__stdcall *RegisterPluginCallback)(HMODULE, NSISPLUGINCALLBACK);
+};
+
+typedef struct _stack_t {
+  struct _stack_t *next;
+  TCHAR text[MAX_PATH];
+} stack_t;
+
+int popstring(stack_t **stacktop, LPTSTR str, int len);
+void pushstring(stack_t **stacktop, LPCTSTR str, int len);
+
+struct CertificateCheckInfo
+{
+  wchar_t filePath[MAX_PATH];
+  wchar_t name[MAX_PATH];
+  wchar_t issuer[MAX_PATH];
+};
+
+static HINSTANCE gHInst;
+static HANDLE gCheckThread;
+static HANDLE gCheckEvent;
+static bool gCheckTrustPassed;
+static bool gCheckAttributesPassed;
+
+// We need a plugin callback not only to clean up our thread, but also
+// because registering a callback prevents NSIS from unloading the DLL
+// after each call from the script.
+UINT_PTR __cdecl
+NSISPluginCallback(NSPIM event)
+{
+  if (event == NSPIM_UNLOAD){
+    if (gCheckThread != NULL &&
+        WaitForSingleObject(gCheckThread, 0) != WAIT_OBJECT_0) {
+      TerminateThread(gCheckThread, ERROR_OPERATION_ABORTED);
+    }
+    CloseHandle(gCheckThread);
+    gCheckThread = NULL;
+    CloseHandle(gCheckEvent);
+    gCheckEvent = NULL;
+  }
+  return NULL;
+}
+
+/**
+ * Checks to see if a file stored at filePath matches the specified info. This
+ * only supports the name and issuer attributes currently.
+ *
+ * @param  certContext  The certificate context of the file
+ * @param  infoToMatch  The acceptable information to match
+ * @return FALSE if the info does not match or if any error occurs in the check
+ */
+BOOL
+DoCertificateAttributesMatch(PCCERT_CONTEXT certContext,
+                             CertificateCheckInfo* infoToMatch)
+{
+  DWORD dwData;
+  LPTSTR szName = NULL;
+
+  // Pass in NULL to get the needed size of the issuer buffer.
+  dwData = CertGetNameString(certContext,
+                             CERT_NAME_SIMPLE_DISPLAY_TYPE,
+                             CERT_NAME_ISSUER_FLAG, NULL,
+                             NULL, 0);
+
+  if (!dwData) {
+    return FALSE;
+  }
+
+  // Allocate memory for Issuer name buffer.
+  szName = (LPTSTR)LocalAlloc(LPTR, dwData * sizeof(WCHAR));
+  if (!szName) {
+    return FALSE;
+  }
+
+  // Get Issuer name.
+  if (!CertGetNameString(certContext, CERT_NAME_SIMPLE_DISPLAY_TYPE,
+                         CERT_NAME_ISSUER_FLAG, NULL, szName, dwData)) {
+    LocalFree(szName);
+    return FALSE;
+  }
+
+  // If the issuer does not match, return a failure.
+  if (!infoToMatch->issuer ||
+      wcscmp(szName, infoToMatch->issuer)) {
+    LocalFree(szName);
+    return FALSE;
+  }
+
+  LocalFree(szName);
+  szName = NULL;
+
+  // Pass in NULL to get the needed size of the name buffer.
+  dwData = CertGetNameString(certContext, CERT_NAME_SIMPLE_DISPLAY_TYPE,
+                             0, NULL, NULL, 0);
+  if (!dwData) {
+    return FALSE;
+  }
+
+  // Allocate memory for the name buffer.
+  szName = (LPTSTR)LocalAlloc(LPTR, dwData * sizeof(WCHAR));
+  if (!szName) {
+    return FALSE;
+  }
+
+  // Obtain the name.
+  if (!(CertGetNameString(certContext, CERT_NAME_SIMPLE_DISPLAY_TYPE, 0,
+                          NULL, szName, dwData))) {
+    LocalFree(szName);
+    return FALSE;
+  }
+
+  // If the issuer does not match, return a failure.
+  if (!infoToMatch->name ||
+      wcscmp(szName, infoToMatch->name)) {
+    LocalFree(szName);
+    return FALSE;
+  }
+
+  // We have a match!
+  LocalFree(szName);
+
+  // If there were any errors we would have aborted by now.
+  return TRUE;
+}
+
+/**
+ * Checks to see if a file's signing cert matches the specified info. This
+ * only supports the name and issuer attributes currently.
+ *
+ * @param  info  The acceptable information to match
+ * @return ERROR_SUCCESS if successful, ERROR_NOT_FOUND if the info
+ *         does not match, or the last error otherwise.
+ */
+DWORD
+CheckCertificateInfoForPEFile(CertificateCheckInfo* info)
+{
+  HCERTSTORE certStore = NULL;
+  HCRYPTMSG cryptMsg = NULL;
+  PCCERT_CONTEXT certContext = NULL;
+  PCMSG_SIGNER_INFO signerInfo = NULL;
+  DWORD lastError = ERROR_SUCCESS;
+
+  // Get the HCERTSTORE and HCRYPTMSG from the signed file.
+  DWORD encoding, contentType, formatType;
+  BOOL result = CryptQueryObject(CERT_QUERY_OBJECT_FILE,
+                                 info->filePath,
+                                 CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED,
+                                 CERT_QUERY_CONTENT_FLAG_ALL,
+                                 0, &encoding, &contentType,
+                                 &formatType, &certStore, &cryptMsg, NULL);
+  if (!result) {
+    lastError = GetLastError();
+    goto cleanup;
+  }
+
+  // Pass in NULL to get the needed signer information size.
+  DWORD signerInfoSize;
+  result = CryptMsgGetParam(cryptMsg, CMSG_SIGNER_INFO_PARAM, 0,
+                            NULL, &signerInfoSize);
+  if (!result) {
+    lastError = GetLastError();
+    goto cleanup;
+  }
+
+  // Allocate the needed size for the signer information.
+  signerInfo = (PCMSG_SIGNER_INFO)LocalAlloc(LPTR, signerInfoSize);
+  if (!signerInfo) {
+    lastError = GetLastError();
+    goto cleanup;
+  }
+
+  // Get the signer information (PCMSG_SIGNER_INFO).
+  // In particular we want the issuer and serial number.
+  result = CryptMsgGetParam(cryptMsg, CMSG_SIGNER_INFO_PARAM, 0,
+                            (PVOID)signerInfo, &signerInfoSize);
+  if (!result) {
+    lastError = GetLastError();
+    goto cleanup;
+  }
+
+  // Search for the signer certificate in the certificate store.
+  CERT_INFO certInfo;
+  certInfo.Issuer = signerInfo->Issuer;
+  certInfo.SerialNumber = signerInfo->SerialNumber;
+  certContext = CertFindCertificateInStore(certStore, ENCODING, 0,
+                                           CERT_FIND_SUBJECT_CERT,
+                                           (PVOID)&certInfo, NULL);
+  if (!certContext) {
+    lastError = GetLastError();
+    goto cleanup;
+  }
+
+  if (!DoCertificateAttributesMatch(certContext, info)) {
+    lastError = ERROR_NOT_FOUND;
+    goto cleanup;
+  }
+
+cleanup:
+  if (signerInfo) {
+    LocalFree(signerInfo);
+  }
+  if (certContext) {
+    CertFreeCertificateContext(certContext);
+  }
+  if (certStore) {
+    CertCloseStore(certStore, 0);
+  }
+  if (cryptMsg) {
+    CryptMsgClose(cryptMsg);
+  }
+  return lastError;
+}
+
+/**
+ * Verifies the trust of a signed file's certificate.
+ *
+ * @param  filePath  The file path to check.
+ * @return ERROR_SUCCESS if successful, or the last error code otherwise.
+ */
+DWORD
+VerifyCertificateTrustForFile(LPCWSTR filePath)
+{
+  // Setup the file to check.
+  WINTRUST_FILE_INFO fileToCheck;
+  ZeroMemory(&fileToCheck, sizeof(fileToCheck));
+  fileToCheck.cbStruct = sizeof(WINTRUST_FILE_INFO);
+  fileToCheck.pcwszFilePath = filePath;
+
+  // Setup what to check, we want to check it is signed and trusted.
+  WINTRUST_DATA trustData;
+  // ZeroMemory should be fine here, but the compiler converts that into a
+  // call to memset, and we're avoiding the C runtime to keep file size down.
+  SecureZeroMemory(&trustData, sizeof(trustData));
+  trustData.cbStruct = sizeof(trustData);
+  trustData.dwUIChoice = WTD_UI_NONE;
+  trustData.dwUnionChoice = WTD_CHOICE_FILE;
+  trustData.pFile = &fileToCheck;
+
+  GUID policyGUID = WINTRUST_ACTION_GENERIC_VERIFY_V2;
+  // Check if the file is signed by something that is trusted.
+  LONG ret = WinVerifyTrust(NULL, &policyGUID, &trustData);
+  return ret;
+}
+
+/**
+ * Synchronously verifies the trust and attributes of a signed PE file.
+ * Meant to be invoked as a thread entry point from CheckPETrustAndInfoAsync.
+ */
+DWORD WINAPI
+VerifyCertThreadProc(void* info)
+{
+  CertificateCheckInfo* certInfo = (CertificateCheckInfo*)info;
+
+  if (VerifyCertificateTrustForFile(certInfo->filePath) == ERROR_SUCCESS) {
+    gCheckTrustPassed = true;
+  }
+
+  if (CheckCertificateInfoForPEFile(certInfo) == ERROR_SUCCESS) {
+    gCheckAttributesPassed = true;
+  }
+
+  LocalFree(info);
+  SetEvent(gCheckEvent);
+  return 0;
+}
+
+/**
+ * Verifies the trust and the attributes of a signed PE file's certificate on
+*  a separate thread. Returns immediately upon starting that thread.
+ * Call GetStatus (repeatedly if necessary) to get the result of the checks.
+ *
+ * @param  stacktop  A pointer to the NSIS stack.
+ *                   From the top down, the stack should contain:
+ *                   1) the path to the file that will have its trust verified
+ *                   2) the expected certificate subject common name
+ *                   3) the expected certificate issuer common name
+ */
+extern "C" void __declspec(dllexport)
+CheckPETrustAndInfoAsync(HWND, int, TCHAR*, stack_t **stacktop, extra_parameters* pX)
+{
+  pX->RegisterPluginCallback(gHInst, NSISPluginCallback);
+
+  gCheckTrustPassed = false;
+  gCheckAttributesPassed = false;
+  gCheckThread = nullptr;
+
+  CertificateCheckInfo* certInfo =
+    (CertificateCheckInfo*)LocalAlloc(0, sizeof(CertificateCheckInfo));
+  if (certInfo) {
+    popstring(stacktop, certInfo->filePath, MAX_PATH);
+    popstring(stacktop, certInfo->name, MAX_PATH);
+    popstring(stacktop, certInfo->issuer, MAX_PATH);
+
+    gCheckThread = CreateThread(nullptr, 0, VerifyCertThreadProc,
+                                (void*)certInfo, 0, nullptr);
+  }
+  if (!gCheckThread) {
+    LocalFree(certInfo);
+    SetEvent(gCheckEvent);
+  }
+}
+
+/**
+ * Returns the result of a certificate check on the NSIS stack.
+ *
+ * If the check is not yet finished, will push "0" to the stack.
+ * If the check is finished, the top of the stack will be "1", followed by:
+ *   "1" if the certificate is trusted by the system, "0" if not. Then:
+ *   "1" if the certificate attributes matched those provided, "0" if not.
+ */
+extern "C" void __declspec(dllexport)
+GetStatus(HWND, int, TCHAR*, stack_t **stacktop, void*)
+{
+  if (WaitForSingleObject(gCheckEvent, 0) == WAIT_OBJECT_0) {
+    pushstring(stacktop, gCheckAttributesPassed ? L"1" : L"0", 2);
+    pushstring(stacktop, gCheckTrustPassed ? L"1" : L"0", 2);
+    pushstring(stacktop, L"1", 2);
+  } else {
+    pushstring(stacktop, L"0", 2);
+  }
+}
+
+BOOL WINAPI
+DllMain(HINSTANCE hInst, DWORD fdwReason, LPVOID)
+{
+  if (fdwReason == DLL_PROCESS_ATTACH) {
+    gHInst = hInst;
+    gCheckEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
+  }
+  return TRUE;
+}
+
+/**
+ * Removes an element from the top of the NSIS stack
+ *
+ * @param  stacktop A pointer to the top of the stack
+ * @param  str      The string to pop to
+ * @param  len      The max length
+ * @return 0 on success
+*/
+int popstring(stack_t **stacktop, LPTSTR str, int len)
+{
+  // Removes the element from the top of the stack and puts it in the buffer
+  stack_t *th;
+  if (!stacktop || !*stacktop) {
+    return 1;
+  }
+
+  th = (*stacktop);
+  lstrcpyn(str,th->text, len);
+  *stacktop = th->next;
+  GlobalFree((HGLOBAL)th);
+  return 0;
+}
+
+/**
+ * Adds an element to the top of the NSIS stack
+ *
+ * @param  stacktop A pointer to the top of the stack
+ * @param  str      The string to push on the stack
+ * @param  len      The length of the string to push on the stack
+ * @return 0 on success
+*/
+void pushstring(stack_t **stacktop, LPCTSTR str, int len)
+{
+  stack_t *th;
+  if (!stacktop) { 
+    return;
+  }
+
+  th = (stack_t*)GlobalAlloc(GPTR, sizeof(stack_t) + len);
+  lstrcpyn(th->text, str, len);
+  th->next = *stacktop;
+  *stacktop = th;
+}
diff --git a/other-licenses/nsis/Contrib/CertCheck/CertCheck.sln b/other-licenses/nsis/Contrib/CertCheck/CertCheck.sln
new file mode 100644
index 0000000000..5a92a248c4
--- /dev/null
+++ b/other-licenses/nsis/Contrib/CertCheck/CertCheck.sln
@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.27428.2015
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{D94576A7-B8CF-4E2C-AAF3-89213C9F3F4C}") = "CertCheck", "CertCheck.vcxproj", "{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}.Debug|x64.ActiveCfg = Debug|x64
+		{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}.Debug|x64.Build.0 = Debug|x64
+		{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}.Debug|x86.ActiveCfg = Debug|Win32
+		{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}.Debug|x86.Build.0 = Debug|Win32
+		{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}.Release|x64.ActiveCfg = Release|x64
+		{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}.Release|x64.Build.0 = Release|x64
+		{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}.Release|x86.ActiveCfg = Release|Win32
+		{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {182ECAA2-6C57-480C-B5B7-9FFF56875051}
+	EndGlobalSection
+EndGlobal
diff --git a/other-licenses/nsis/Contrib/CertCheck/CertCheck.vcxproj b/other-licenses/nsis/Contrib/CertCheck/CertCheck.vcxproj
new file mode 100644
index 0000000000..9062b38a40
--- /dev/null
+++ b/other-licenses/nsis/Contrib/CertCheck/CertCheck.vcxproj
@@ -0,0 +1,169 @@
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+    <ProjectGuid>{83D56BCB-B9D1-44AB-BC96-9EA8A645CB0D}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>CertCheck</RootNamespace>
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+      <WarningLevel>Level3</WarningLevel>
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+      <WarningLevel>Level3</WarningLevel>
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+      <IntrinsicFunctions>true</IntrinsicFunctions>
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+    <Link>
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+      <EntryPointSymbol>DllMain</EntryPointSymbol>
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+      <SDLCheck>false</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;CERTCHECK_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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+    <Link>
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+      <OptimizeReferences>true</OptimizeReferences>
+      <EntryPointSymbol>DllMain</EntryPointSymbol>
+      <LinkTimeCodeGeneration>Default</LinkTimeCodeGeneration>
+      <GenerateDebugInformation>false</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="CertCheck.cpp" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>
+\ No newline at end of file