refactor(windows): split Windows code into winapi (#575)

crypto/abe_embed_windows.go

@@ -1,25 +0,0 @@
-//go:build windows && abe_embed
-
-package crypto
-
-import (
-	_ "embed"
-	"fmt"
-)
-
-//go:generate make -C ../.. payload
-
-//go:embed abe_extractor_amd64.bin
-var abePayloadAmd64 []byte
-
-func ABEPayload(arch string) ([]byte, error) {
-	switch arch {
-	case "amd64":
-		if len(abePayloadAmd64) == 0 {
-			return nil, fmt.Errorf("abe: amd64 payload is empty (build system bug)")
-		}
-		return abePayloadAmd64, nil
-	default:
-		return nil, fmt.Errorf("abe: arch %q not supported in this build", arch)
-	}
-}

crypto/abe_stub_windows.go

@@ -1,12 +0,0 @@
-//go:build windows && !abe_embed
-
-package crypto
-
-import "fmt"
-
-func ABEPayload(arch string) ([]byte, error) {
-	return nil, fmt.Errorf(
-		"abe: payload not embedded in this build (rebuild with -tags abe_embed; arch=%s)",
-		arch,
-	)
-}

crypto/crypto_windows.go

@@ -3,9 +3,7 @@
 package crypto
 
 import (
-	"fmt"
-	"syscall"
-	"unsafe"
+	"github.com/moond4rk/hackbrowserdata/utils/winapi"
 )
 
 // gcmNonceSize is defined in crypto.go (cross-platform).
@@ -32,47 +30,10 @@ func DecryptYandex(key, ciphertext []byte) ([]byte, error) {
 	return AESGCMDecrypt(key, nonce, payload)
 }
 
-type dataBlob struct {
-	cbData uint32
-	pbData *byte
-}
-
-func newBlob(d []byte) *dataBlob {
-	if len(d) == 0 {
-		return &dataBlob{}
-	}
-	return &dataBlob{
-		pbData: &d[0],
-		cbData: uint32(len(d)),
-	}
-}
-
-func (b *dataBlob) bytes() []byte {
-	d := make([]byte, b.cbData)
-	copy(d, (*[1 << 30]byte)(unsafe.Pointer(b.pbData))[:])
-	return d
-}
-
-// DecryptDPAPI (Data Protection Application Programming Interface)
-// is a simple cryptographic application programming interface
-// available as a built-in component in Windows 2000 and
-// later versions of Microsoft Windows operating systems
+// DecryptDPAPI decrypts a DPAPI-protected blob using the current user's
+// master key. The actual Win32 call (and its DATA_BLOB / LocalFree dance)
+// lives in utils/winapi so every package that needs a syscall handle
+// shares a single declaration instead of re-opening Crypt32.dll per call.
 func DecryptDPAPI(ciphertext []byte) ([]byte, error) {
-	crypt32 := syscall.NewLazyDLL("Crypt32.dll")
-	kernel32 := syscall.NewLazyDLL("Kernel32.dll")
-	unprotectDataProc := crypt32.NewProc("CryptUnprotectData")
-	localFreeProc := kernel32.NewProc("LocalFree")
-
-	var outBlob dataBlob
-	r, _, err := unprotectDataProc.Call(
-		uintptr(unsafe.Pointer(newBlob(ciphertext))),
-		0, 0, 0, 0, 0,
-		uintptr(unsafe.Pointer(&outBlob)),
-	)
-	if r == 0 {
-		return nil, fmt.Errorf("CryptUnprotectData failed with error %w", err)
-	}
-
-	defer localFreeProc.Call(uintptr(unsafe.Pointer(outBlob.pbData)))
-	return outBlob.bytes(), nil
+	return winapi.DecryptDPAPI(ciphertext)
 }

crypto/keyretriever/abe_windows.go

@@ -11,10 +11,10 @@ import (
 
 	"github.com/tidwall/gjson"
 
-	"github.com/moond4rk/hackbrowserdata/crypto"
+	"github.com/moond4rk/hackbrowserdata/crypto/windows/payload"
 	"github.com/moond4rk/hackbrowserdata/log"
-	"github.com/moond4rk/hackbrowserdata/utils/browserutil"
 	"github.com/moond4rk/hackbrowserdata/utils/injector"
+	"github.com/moond4rk/hackbrowserdata/utils/winutil"
 )
 
 const envEncKeyB64 = "HBD_ABE_ENC_B64"
@@ -36,12 +36,12 @@ func (r *ABERetriever) RetrieveKey(storage, localStatePath string) ([]byte, erro
 		return nil, err
 	}
 
-	payload, err := crypto.ABEPayload("amd64")
+	pl, err := payload.Get("amd64")
 	if err != nil {
 		return nil, fmt.Errorf("abe: %w", err)
 	}
 
-	exePath, err := browserutil.ExecutablePath(browserKey)
+	exePath, err := winutil.ExecutablePath(browserKey)
 	if err != nil {
 		return nil, fmt.Errorf("abe: %w", err)
 	}
@@ -51,7 +51,7 @@ func (r *ABERetriever) RetrieveKey(storage, localStatePath string) ([]byte, erro
 	}
 
 	inj := &injector.Reflective{}
-	key, err := inj.Inject(exePath, payload, env)
+	key, err := inj.Inject(exePath, pl, env)
 	if err != nil {
 		return nil, fmt.Errorf("abe: inject into %s: %w", exePath, err)
 	}

crypto/windows/abe_native/Makefile.frag

@@ -3,7 +3,7 @@ ABE_ARCH   ?= amd64
 ABE_TARGET ?= x86_64-windows-gnu
 
 ABE_SRC_DIR = crypto/windows/abe_native
-ABE_BIN_DIR = crypto
+ABE_BIN_DIR = crypto/windows/payload
 ABE_BIN     = $(ABE_BIN_DIR)/abe_extractor_$(ABE_ARCH).bin
 
 ABE_CFLAGS = -shared -s -O2 \
@@ -38,7 +38,7 @@ payload-verify: $(ABE_BIN)
 	fi
 
 payload-clean:
-	rm -f $(ABE_BIN_DIR)/abe_extractor_*.bin
+	rm -f $(ABE_BIN_DIR)/abe_extractor_*.bin $(ABE_BIN_DIR)/abe_extractor*.lib
 
 # Scratch-layout codegen. The C header bootstrap_layout.h is the single
 # source of truth; the Go constants in crypto/windows/abe_native/bootstrap

crypto/windows/payload/embed_windows.go

@@ -0,0 +1,32 @@
+//go:build windows && abe_embed
+
+// Package payload holds the compiled reflective-injection ABE payload
+// binary and exposes it to the rest of HackBrowserData. The `abe_embed`
+// build tag selects between a real //go:embed'd binary (this file) and
+// a stub (stub_windows.go) so the default `go build ./...` succeeds on
+// machines without the zig toolchain.
+package payload
+
+import (
+	_ "embed"
+	"fmt"
+)
+
+//go:generate make -C ../../.. payload
+
+//go:embed abe_extractor_amd64.bin
+var abePayloadAmd64 []byte
+
+// Get returns the embedded ABE payload for the given architecture.
+// Only "amd64" is supported today; x86 / ARM64 payloads are future work.
+func Get(arch string) ([]byte, error) {
+	switch arch {
+	case "amd64":
+		if len(abePayloadAmd64) == 0 {
+			return nil, fmt.Errorf("abe: amd64 payload is empty (build system bug)")
+		}
+		return abePayloadAmd64, nil
+	default:
+		return nil, fmt.Errorf("abe: arch %q not supported in this build", arch)
+	}
+}

crypto/windows/payload/stub_windows.go

@@ -0,0 +1,15 @@
+//go:build windows && !abe_embed
+
+package payload
+
+import "fmt"
+
+// Get returns an error in non-release builds so feature code that needs
+// the payload fails fast with a clear message. Release builds (built
+// with -tags abe_embed) replace this with the //go:embed'd binary.
+func Get(arch string) ([]byte, error) {
+	return nil, fmt.Errorf(
+		"abe: payload not embedded in this build (rebuild with -tags abe_embed; arch=%s)",
+		arch,
+	)
+}