Basic protection against invalid domain names (#680)

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Henri Dickson 2023-12-13 04:04:41 -05:00 committed by GitHub
parent d07482f5a8
commit 5d508a17ec
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3 changed files with 58 additions and 1 deletions

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@ -3,6 +3,36 @@ import pytest
from users.models import Domain
def test_valid_domain():
"""
Tests that a valid domain is valid
"""
assert Domain.is_valid_domain("example.com")
assert Domain.is_valid_domain("xn----gtbspbbmkef.xn--p1ai")
assert Domain.is_valid_domain("underscore_subdomain.example.com")
assert Domain.is_valid_domain("something.versicherung")
assert Domain.is_valid_domain("11.com")
assert Domain.is_valid_domain("a.cn")
assert Domain.is_valid_domain("sub1.sub2.sample.co.uk")
assert Domain.is_valid_domain("somerandomexample.xn--fiqs8s")
assert not Domain.is_valid_domain("über.com")
assert not Domain.is_valid_domain("example.com:4444")
assert not Domain.is_valid_domain("example.-com")
assert not Domain.is_valid_domain("foo@bar.com")
assert not Domain.is_valid_domain("example.")
assert not Domain.is_valid_domain("example.com.")
assert not Domain.is_valid_domain("-example.com")
assert not Domain.is_valid_domain("_example.com")
assert not Domain.is_valid_domain("_example._com")
assert not Domain.is_valid_domain("example_.com")
assert not Domain.is_valid_domain("example")
assert not Domain.is_valid_domain("a......b.com")
assert not Domain.is_valid_domain("a.123")
assert not Domain.is_valid_domain("123.123")
assert not Domain.is_valid_domain("123.123.123.123")
@pytest.mark.django_db
def test_recursive_block():
"""

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@ -1,5 +1,6 @@
import json
import logging
import re
import ssl
from functools import cached_property
from typing import Optional
@ -8,6 +9,7 @@ import httpx
import pydantic
import urlman
from django.conf import settings
from django.core.exceptions import ValidationError
from django.db import models
from core.models import Config
@ -53,6 +55,14 @@ class DomainStates(StateGraph):
return cls.outdated
def _domain_validator(value: str):
if not Domain.is_valid_domain(value):
raise ValidationError(
"%(value)s is not a valid domain",
params={"value": value},
)
class Domain(StatorModel):
"""
Represents a domain that a user can have an account on.
@ -71,7 +81,9 @@ class Domain(StatorModel):
display domains for now, until we start doing better probing.
"""
domain = models.CharField(max_length=250, primary_key=True)
domain = models.CharField(
max_length=250, primary_key=True, validators=[_domain_validator]
)
service_domain = models.CharField(
max_length=250,
null=True,
@ -119,6 +131,19 @@ class Domain(StatorModel):
class Meta:
indexes: list = []
@classmethod
def is_valid_domain(cls, domain: str) -> bool:
"""
Check if a domain is valid, domain must be lowercase
"""
return (
re.match(
r"^(?:[a-z0-9](?:[a-z0-9-_]{0,61}[a-z0-9])?\.)+[a-z0-9][a-z0-9-_]{0,61}[a-z]$",
domain,
)
is not None
)
@classmethod
def get_remote_domain(cls, domain: str) -> "Domain":
return cls.objects.get_or_create(domain=domain.lower(), local=False)[0]

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@ -18,6 +18,8 @@ def by_handle_or_404(request, handle, local=True, fetch=False) -> Identity:
domain = domain_instance.domain
else:
username, domain = handle.split("@", 1)
if not Domain.is_valid_domain(domain):
raise Http404("Invalid domain")
# Resolve the domain to the display domain
domain_instance = Domain.get_domain(domain)
if domain_instance is None: