add: Add crdreader

Author: Awayume

Makefile

@@ -0,0 +1,9 @@
+.PHONY: build
+
+CC		:= x86_64-w64-mingw32-gcc-win32
+CFLAGS	:= -static -Wall -Wextra
+TARGET	:= crdreader.exe
+SRCS	:= src/crdreader.c
+
+build:
+	$(CC) -o $(TARGET) $(SRCS)

src/crdreader.c

@@ -0,0 +1,40 @@
+// SPDX-FileCopyrightText: 2024 Awayume <[email protected]>
+// SPDX-License-Identifier: MIT
+
+#include <stdio.h>
+
+#include <windows.h>
+#include <wincred.h>
+
+
+int main() {
+    DWORD count;
+    PCREDENTIAL* credentials;
+
+    if (!CredEnumerate(NULL, 0, &count, &credentials)) {
+        char message[] = "[ERROR] Failed to enumerate credentials:";
+        switch (GetLastError()) {
+            case 1168:
+                printf("%s ERROR_NOT_FOUND (0x490)\n", message);
+            case 1312:
+                printf("%s ERROR_NO_SUCH_LOGON_SESSION (0x520)\n", message);
+            case 1004:
+                printf("%s ERROR_INVALID_FLAGS (0x3EC)\n", message);
+            defaut:
+                printf("%sUnknown error\n", message);
+        }
+        return 255;
+    }
+
+    if (count == 0) {
+        printf("No credentials found!\n");
+        return 0;
+    }
+
+    printf("Credentials (total %d):\n", count);
+    for (DWORD i = 0; i < count; i++) {
+        LPSTR key = credentials[i]->TargetName;
+        LPBYTE value = credentials[i]->CredentialBlob;
+        printf("  %s: %s\n", key, value);
+    }
+}