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Disallow unknown script by using csp header for wrapper

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shortcutme 2018-11-26 00:02:35 +01:00
parent 481e029600
commit 99f01475a0
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GPG key ID: 5B63BAE6CB9613AE
1 changed files with 16 additions and 6 deletions
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22
src/Ui/UiRequest.py
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@ -46,6 +46,7 @@ class UiRequest(object):
self.start_response = start_response # Start response function
self.user = None
self.script_nonce = None # Nonce for script tags in wrapper html
def isHostAllowed(self, host):
if host in self.server.allowed_hosts:
@ -222,7 +223,7 @@ class UiRequest(object):
return referer
# Send response headers
def sendHeader(self, status=200, content_type="text/html", noscript=False, allow_ajax=False, extra_headers=[]):
def sendHeader(self, status=200, content_type="text/html", noscript=False, allow_ajax=False, script_nonce=None, extra_headers=[]):
headers = {}
headers["Version"] = "HTTP/1.1"
headers["Connection"] = "Keep-Alive"
@ -233,6 +234,8 @@ class UiRequest(object):
if noscript:
headers["Content-Security-Policy"] = "default-src 'none'; sandbox allow-top-navigation allow-forms; img-src 'self'; font-src 'self'; media-src 'self'; style-src 'self' 'unsafe-inline';"
elif script_nonce:
headers["Content-Security-Policy"] = "script-src 'nonce-%s'" % script_nonce
if allow_ajax:
headers["Access-Control-Allow-Origin"] = "null"
@ -285,6 +288,7 @@ class UiRequest(object):
def actionWrapper(self, path, extra_headers=None):
if not extra_headers:
extra_headers = {}
script_nonce = self.getScriptNonce()
match = re.match("/(?P<address>[A-Za-z0-9\._-]+)(?P<inner_path>/.*|$)", path)
just_added = False
@ -334,14 +338,14 @@ class UiRequest(object):
if not site:
return False
self.sendHeader(extra_headers=extra_headers)
self.sendHeader(extra_headers=extra_headers, script_nonce=script_nonce)
min_last_announce = (time.time() - site.announcer.time_last_announce) / 60
if min_last_announce > 60 and site.settings["serving"] and not just_added:
site.log.debug("Site requested, but not announced recently (last %.0fmin ago). Updating..." % min_last_announce)
gevent.spawn(site.update, announce=True)
return iter([self.renderWrapper(site, path, inner_path, title, extra_headers)])
return iter([self.renderWrapper(site, path, inner_path, title, extra_headers, script_nonce=script_nonce)])
# Make response be sent at once (see https://github.com/HelloZeroNet/ZeroNet/issues/1092)
else: # Bad url
@ -368,7 +372,7 @@ class UiRequest(object):
return query_string
def renderWrapper(self, site, path, inner_path, title, extra_headers, show_loadingscreen=None):
def renderWrapper(self, site, path, inner_path, title, extra_headers, show_loadingscreen=None, script_nonce=None):
file_inner_path = inner_path
if not file_inner_path:
file_inner_path = "index.html" # If inner path defaults to index.html
@ -463,7 +467,8 @@ class UiRequest(object):
rev=config.rev,
lang=config.language,
homepage=homepage,
themeclass=themeclass
themeclass=themeclass,
script_nonce=script_nonce
)
# Create a new wrapper nonce that allows to get one html file without the wrapper
@ -472,6 +477,12 @@ class UiRequest(object):
self.server.wrapper_nonces.append(wrapper_nonce)
return wrapper_nonce
def getScriptNonce(self):
if not self.script_nonce:
self.script_nonce = CryptHash.random(encoding="base64")
return self.script_nonce
# Create a new wrapper nonce that allows to get one site
def getAddNonce(self):
add_nonce = CryptHash.random()
@ -800,4 +811,3 @@ class UiRequest(object):
<h1>%s</h1>
<h2>%s</h3>
""" % (title, cgi.escape(message))