Rewrite cross-site and cross-host requests detection
Make sure browsers send referrers so we can track cross-site requests (could be used to identify which sites user hosts) This breaks /raw because there are no referrers there fixes #227 fixes #223 fixes #224
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caryoscelus
parent
1ba9f2bb56
commit
14e8130acb
2 changed files with 76 additions and 23 deletions
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@ -49,7 +49,7 @@ class SecurityError(Exception):
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@PluginManager.acceptPlugins
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class UiRequest(object):
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class UiRequest:
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def __init__(self, server, get, env, start_response):
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if server:
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@ -99,8 +99,52 @@ class UiRequest(object):
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def resolveDomain(self, domain):
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return self.server.site_manager.resolveDomainCached(domain)
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# Call the request handler function base on path
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def isCrossOriginRequest(self):
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"""Prevent detecting sites on this 0net instance
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In particular, we block non-user requests from other hosts as well as
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cross-site
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"""
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url = self.getRequestUrl()
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fetch_mode = self.env.get('HTTP_SEC_FETCH_MODE')
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origin = self.env.get('HTTP_ORIGIN')
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referer = self.env.get('HTTP_REFERER')
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# Allow all user-initiated requests
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if fetch_mode == 'navigate':
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return False
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# Deny requests that cannot be traced
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if not origin and not referer:
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return True
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# Deny requests from non-0net origins
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if origin and not self.isSameHost(origin, url):
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return True
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# Allow non-site specific requests
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if self.getRequestSite() == '/':
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return False
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# Deny cross site requests
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if not self.isSameOrigin(referer, url):
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return True
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return False
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def route(self, path):
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"""Main routing
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If no internal action is performed, calls action[Path] from plugins
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This behaviour is not very flexible or easy to follow, so perhaps
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we'd want something else..
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"""
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if self.isCrossOriginRequest():
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return self.error404()
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# Restict Ui access by ip
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if config.ui_restrict and self.env['REMOTE_ADDR'] not in config.ui_restrict:
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return self.error403(details=False)
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@ -284,37 +328,43 @@ class UiRequest(object):
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is_script_nonce_supported = True
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return is_script_nonce_supported
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def getRequestSite(self):
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"""Return 0net site addr associated with current request
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If request is site-agnostic, returns /
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"""
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path = self.env["PATH_INFO"]
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match = re.match(r'(/raw)?(?P<site>/1[a-zA-Z0-9]*)', path)
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if not match:
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match = re.match(r'(/raw)?/(?P<domain>[a-zA-Z0-9\.\-_]*)', path)
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if match:
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domain = match.group('domain')
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if self.isDomain(domain):
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addr = self.resolveDomain(domain)
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return '/'+addr
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return '/'
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return match.group('site')
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# Send response headers
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def sendHeader(self, status=200, content_type="text/html", noscript=False, allow_ajax=False, script_nonce=None, extra_headers=[]):
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url = self.getRequestUrl()
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referer = self.env.get('HTTP_REFERER')
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origin = self.env.get('HTTP_ORIGIN')
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fetch_site = self.env.get('HTTP_SEC_FETCH_SITE')
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fetch_mode = self.env.get('HTTP_SEC_FETCH_MODE')
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not_same_ref = referer and not self.isSameHost(referer, url)
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not_same_origin = origin and not self.isSameHost(origin, url)
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cross_site_not_navigate = not referer and fetch_site == 'cross-site' and not fetch_mode == 'navigate'
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if status != 404 and (not_same_ref or not_same_origin or cross_site_not_navigate):
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# pretend nothing is here for third-party access
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return self.error404()
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headers = {}
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headers["Version"] = "HTTP/1.1"
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headers["Connection"] = "Keep-Alive"
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headers["Keep-Alive"] = "max=25, timeout=30"
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headers["X-Frame-Options"] = "SAMEORIGIN"
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headers["Referrer-Policy"] = "same-origin"
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if noscript:
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headers["Content-Security-Policy"] = "default-src 'none'; sandbox allow-top-navigation allow-forms; img-src *; font-src * data:; media-src *; style-src * 'unsafe-inline';"
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elif script_nonce and self.isScriptNonceSupported():
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headers["Content-Security-Policy"] = "default-src 'none'; script-src 'nonce-{0}'; img-src 'self' blob: data:; style-src 'self' blob: 'unsafe-inline'; connect-src *; frame-src 'self' blob:".format(script_nonce)
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headers["Content-Security-Policy"] = f"default-src 'none'; script-src 'nonce-{script_nonce}'; img-src 'self' blob: data:; style-src 'self' blob: 'unsafe-inline'; connect-src *; frame-src 'self' blob:"
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if allow_ajax:
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headers["Access-Control-Allow-Origin"] = "null"
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if self.env["REQUEST_METHOD"] == "OPTIONS":
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# Allow json access
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headers["Access-Control-Allow-Headers"] = "Origin, X-Requested-With, Content-Type, Accept, Cookie, Range"
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headers["Access-Control-Allow-Headers"] = "Origin, X-Requested-With, Content-Type, Accept, Cookie, Range, Referer"
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headers["Access-Control-Allow-Credentials"] = "true"
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# Download instead of display file types that can be dangerous
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@ -624,15 +674,18 @@ class UiRequest(object):
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if not url_a or not url_b:
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return False
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url_a = url_a.replace("/raw/", "/")
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url_b = url_b.replace("/raw/", "/")
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host_pattern = r'(?P<host>http[s]?://.*?)(/|$)'
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origin_pattern = "http[s]{0,1}://(.*?/).*"
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match_a = re.match(host_pattern, url_a)
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match_b = re.match(host_pattern, url_b)
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origin_a = re.sub(origin_pattern, "\\1", url_a)
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origin_b = re.sub(origin_pattern, "\\1", url_b)
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if not match_a or not match_b:
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return False
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return origin_a == origin_b
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host_a = match_a.group('host')
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host_b = match_b.group('host')
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return host_a == host_b
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def isSameOrigin(self, url_a, url_b):
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"""Check if 0net origin is the same"""
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@ -74,7 +74,7 @@ else if (window.opener && window.opener.location.toString()) {
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<!-- Site Iframe -->
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<iframe src='about:blank' id='inner-iframe' sandbox="allow-forms allow-scripts allow-top-navigation allow-popups allow-modals allow-presentation allow-pointer-lock allow-popups-to-escape-sandbox {sandbox_permissions}" allowfullscreen="true" webkitallowfullscreen="true" mozallowfullscreen="true" oallowfullscreen="true" msallowfullscreen="true"></iframe>
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<iframe src='about:blank' id='inner-iframe' sandbox="allow-forms allow-scripts allow-top-navigation allow-popups allow-modals allow-presentation allow-pointer-lock allow-popups-to-escape-sandbox allow-same-origin {sandbox_permissions}" allowfullscreen="true" webkitallowfullscreen="true" mozallowfullscreen="true" oallowfullscreen="true" msallowfullscreen="true" referrerpolicy="same-origin"></iframe>
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<!-- Site info -->
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<script id="script_init" nonce="{script_nonce}">
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