Make gcpw default cred provider

Bug: 1066560
Change-Id: Icb6ae8ffc1cd5e4c7884e1984b584aa1f301433d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130180
Commit-Queue: Rakesh Soma <rakeshsoma@google.com>
Reviewed-by: Yusuf Sengul <yusufsn@google.com>
Cr-Commit-Position: refs/heads/master@{#755422}

chrome/credential_provider/gaiacp/BUILD.gn

@@ -35,6 +35,7 @@ source_set("common") {
   public_configs = [ ":common_config" ]
   public_deps = [ "//chrome/credential_provider/common:common_constants" ]
   deps = [
+    ":gaia_credential_provider_idl",
     ":string_resources",
     "//base",
     "//build:branding_buildflags",

chrome/credential_provider/gaiacp/reg_utils.cc

@@ -14,6 +14,7 @@
 #include "base/win/win_util.h"
 #include "build/branding_buildflags.h"
 #include "chrome/credential_provider/common/gcp_strings.h"
+#include "chrome/credential_provider/gaiacp/gaia_credential_provider_i.h"
 #include "chrome/credential_provider/gaiacp/logging.h"
 
 namespace credential_provider {
@@ -48,6 +49,15 @@ constexpr wchar_t kAccountPicturesRootRegKey[] =
     L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\AccountPicture\\Users";
 constexpr wchar_t kImageRegKey[] = L"Image";
 
+// Registry entry that controls whether GCPW is the default
+// Credential Provider or not.
+constexpr wchar_t kMakeGcpwDefaultCredProvider[] = L"set_gcpw_as_default_cp";
+// Windows OS defined registry entry used to configure the
+// default credential provider CLSID.
+constexpr wchar_t kDefaultCredProviderPath[] =
+    L"Software\\Policies\\Microsoft\\Windows\\System";
+constexpr wchar_t kDefaultCredProviderKey[] = L"DefaultCredentialProvider";
+
 HRESULT SetMachineRegDWORD(const base::string16& key_name,
                            const base::string16& name,
                            DWORD value) {
@@ -96,6 +106,15 @@ base::string16 GetAccountPictureRegPathForUSer(const base::string16& user_sid) {
 
 }  // namespace
 
+HRESULT MakeGcpwDefaultCP() {
+  if (GetGlobalFlagOrDefault(kMakeGcpwDefaultCredProvider, 1))
+    return SetMachineRegString(
+        kDefaultCredProviderPath, kDefaultCredProviderKey,
+        base::win::String16FromGUID(CLSID_GaiaCredentialProvider));
+
+  return S_OK;
+}
+
 HRESULT GetMachineRegDWORD(const base::string16& key_name,
                            const base::string16& name,
                            DWORD* value) {

chrome/credential_provider/gaiacp/reg_utils.h

@@ -156,6 +156,9 @@ HRESULT GetMachineGuid(base::string16* machine_guid);
 // Sets  HKLM\SOFTWARE\Microsoft\Cryptography\MachineGuid registry for testing.
 HRESULT SetMachineGuidForTesting(const base::string16& machine_guid);
 
+// Set corresponding registry entry that would make GCPW as the default
+// credential provider.
+HRESULT MakeGcpwDefaultCP();
 }  // namespace credential_provider
 
 #endif  // CHROME_CREDENTIAL_PROVIDER_GAIACP_REG_UTILS_H_

chrome/credential_provider/setup/setup.cc

@@ -45,6 +45,7 @@
 
 using credential_provider::GetGlobalFlagOrDefault;
 using credential_provider::kRegEnableVerboseLogging;
+using credential_provider::MakeGcpwDefaultCP;
 using credential_provider::putHR;
 
 namespace {
@@ -101,6 +102,9 @@ int APIENTRY wWinMain(HINSTANCE hInstance,
   if (GetGlobalFlagOrDefault(kRegEnableVerboseLogging, 1))
     logging::SetMinLogLevel(logging::LOG_VERBOSE);
 
+  // Set GCPW as the default credential provider for the end user.
+  MakeGcpwDefaultCP();
+
   if (cmdline->HasSwitch(switches::kLoggingLevel)) {
     std::string log_level =
         cmdline->GetSwitchValueASCII(switches::kLoggingLevel);