hostnames registration application for I2P
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#!/usr/bin/env python2.6
import re
from django import forms
from web.postkey.models import i2phost
def validate_hostname(data):
"""
Here we do hostname validation as described in
http://www.i2p2.i2p/naming.html and some additional checks
described in http://zzz.i2p/topics/739
"""
# convert hostname to lowercase and strip leading and trailing whitespaces
data = data.lower().strip()
# do lenght check here for avoiding django.db.utils.DatabaseError exceptions
# when trying to add too long hostname with py-i2phosts-injector
if len(data) > 67:
raise forms.ValidationError('Too long hostname (should be 67 chars max)')
# Must end with '.i2p'.
if re.match(r'.*\.i2p$', data) == None:
raise forms.ValidationError('Hostname doesn\'t ends with .i2p')
# Base 32 hostnames (*.b32.i2p) are not allowed
if re.match(r'.*\.b32\.i2p$', data):
raise forms.ValidationError('Base32 hostnames are not allowed')
# prevent common errors
if re.match(r'\.i2p$', data):
raise forms.ValidationError('Incomplete hostname')
if re.match(r'^http:/', data):
raise forms.ValidationError('Do not paste full URL, just domain')
# Must not contain '..'
if re.search(r'\.\.', data):
raise forms.ValidationError('".." in hostname')
# Allow only 4ld domains and below
if data.count('.') > 3:
raise forms.ValidationError('Subdomains deeper than 4LD are not allowed')
# Must contain only [a-z] [0-9] '.' and '-'
h = re.match(r'([a-z0-9.-]+)\.i2p$', data)
if h == None:
raise forms.ValidationError('Illegal characters in hostname')
else:
namepart = h.groups()[0]
# Must not start with '.' or '-'
if re.match(r'^\.|-', namepart):
raise forms.ValidationError('Hostname must not starts with "." or "-"')
# Must not contain '.-' or '-.' (as of 0.6.1.33)
if re.search(r'(\.-)|(-\.)', namepart):
raise forms.ValidationError('Hostname contain ".-" or "-."')
# Must not contain '--' except in 'xn--' for IDN
if re.search(r'(?<!^xn)--', namepart) and re.search(r'(?<!\.xn)--', namepart):
raise forms.ValidationError('Hostname contain "--" and it\'s not an IDN')
# Certain hostnames reserved for project use are not allowed
if re.search(r'(^|\.)(proxy|router|console|b32|b64)$', namepart):
raise forms.ValidationError('Trying to use reserved hostname')
# Block various localhost.* in addition
if re.match(r'^localhost($|\..*$)', namepart):
raise forms.ValidationError('localhost.* not allowed')
return data
def validate_b64hash(data, check_uniq=True):
"""
Base64 hash validation
"""
# strip leading and trailing whitespaces
data = data.strip()
length = len(data)
# check for b32 address misuse
if re.match(r'.*\.b32\.i2p$', data):
raise forms.ValidationError('You should paste base64 hash, not a base32!')
# fail if contains .i2p= (full foo.i2p=key)
if re.search(r'\.i2p=', data):
raise forms.ValidationError('Do not paste full hosts.txt entry! Only base64 hash are needed')
# check for pasting router hash
if length == 44:
raise forms.ValidationError('Do not paste router hash! Go to i2ptunnel page and \
find a destination hash')
# Minimum key length 516 bytes
if length < 516:
raise forms.ValidationError('Specified base64 hash are less than 516 bytes')
# Maximum key length 616 bytes
if length > 616:
raise forms.ValidationError('Specified base64 hash are bigger than 616 bytes')
# keys with cert may ends with anything, so check is relaxed
if length > 516 and re.match(r'[a-zA-Z0-9\-~]+$', data) == None:
raise forms.ValidationError('Invalid characters in base64 hash')
# base64-validity test
if length > 516:
# we need temporary variable here to avoid modifying main "data"
test_data = data
# add pad-characters needed for proper decoding cos i2p does not
for i in range(4):
quanta, leftover = divmod(len(test_data), 4)
if leftover:
test_data += '='
else:
break
# if more than 2 pad chars were added, raise an error
if i > 2:
raise forms.ValidationError('Corrupted base64 hash')
# base64-i2p
if length == 516 and re.match(r'[a-zA-Z0-9\-~]+AA$', data) == None:
raise forms.ValidationError('Invalid base64 hash')
if check_uniq == True:
# Avoid adding non-unique hashes
qs = i2phost.objects.filter(b64hash=data)
if qs.exists():
raise forms.ValidationError('Base64 hash must be unique')
return data