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block attempts to inject HTML into the serverlist, this includes many UTF-8 variants of <

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Ben Russell (300178622) 2013-07-31 20:59:00 +12:00
parent 97d5ad219a
commit c909d296e2
1 changed files with 25 additions and 7 deletions
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32
heart/heartbeat.py
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@ -57,6 +57,24 @@ def stripnul(s):
idx = s.find("\x00")
return (s if idx == -1 else s[:idx])
def replace_char_all(s, f, t):
v = ord(f)
s = s.replace(f, t)
s = s.replace(chr(0xC0 | ((v>>6)&3)) + chr(0x80 | (v&63)), t)
s = s.replace(chr(0xE0) + chr(0x80 | ((v>>6)&3)) + chr(0x80 | (v&63)), t)
s = s.replace(chr(0xF0) + chr(0x80) + chr(0x80 | ((v>>6)&3)) + chr(0x80 | (v&63)), t)
s = s.replace(chr(0xF8) + chr(0x80) + chr(0x80) + chr(0x80 | ((v>>6)&3)) + chr(0x80 | (v&63)), t)
s = s.replace(chr(0xFC) + chr(0x80) + chr(0x80) + chr(0x80) + chr(0x80 | ((v>>6)&3)) + chr(0x80 | (v&63)), t)
# TODO: handle the 6-bit and 8-bit variants and whatnot
return s
def sanestr(s):
s = str(s)
s = replace_char_all(s, "&", "&")
s = replace_char_all(s, "<", "&lt;")
s = replace_char_all(s, ">", "&gt;")
return s
class HTTPClient:
def __init__(self, ct, reactor, server, sockfd):
self.reactor = reactor
@ -95,13 +113,13 @@ class HTTPClient:
s += "</thead>\n"
for d in l:
s += "<tr>"
s += "<td>" + str(d["address"]) + "</td>"
s += "<td>" + str(d["port"]) + "</td>"
s += "<td>" + str(d["name"]) + "</td>"
s += "<td>" + str(d["version"]) + "</td>"
s += "<td>" + str(d["players_current"]) + " / " + str(d["players_max"]) + "</td>"
s += "<td>" + str(d["mode"]) + "</td>"
s += "<td>" + str(d["map"]) + "</td>"
s += "<td>" + sanestr(d["address"]) + "</td>"
s += "<td>" + sanestr(d["port"]) + "</td>"
s += "<td>" + sanestr(d["name"]) + "</td>"
s += "<td>" + sanestr(d["version"]) + "</td>"
s += "<td>" + sanestr(d["players_current"]) + " / " + sanestr(d["players_max"]) + "</td>"
s += "<td>" + sanestr(d["mode"]) + "</td>"
s += "<td>" + sanestr(d["map"]) + "</td>"
s += "</tr>\n"
s += "</table>\n"
s += "</div>\n"