mirror of
https://github.com/mastodon/mastodon.git
synced 2024-12-30 04:14:36 +00:00
051efed5ed
* Bypass MX validation for explicitly allowed domains This spares some lookups and prevent issues in some edge cases with local domains. * Add tests * Fix test
64 lines
1.5 KiB
Ruby
64 lines
1.5 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
require 'resolv'
|
|
|
|
class EmailMxValidator < ActiveModel::Validator
|
|
def validate(user)
|
|
return if user.email.blank?
|
|
|
|
domain = get_domain(user.email)
|
|
|
|
if domain.blank?
|
|
user.errors.add(:email, :invalid)
|
|
elsif !on_allowlist?(domain)
|
|
ips, hostnames = resolve_mx(domain)
|
|
|
|
if ips.empty?
|
|
user.errors.add(:email, :unreachable)
|
|
elsif on_blacklist?(hostnames + ips)
|
|
user.errors.add(:email, :blocked)
|
|
end
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
def get_domain(value)
|
|
_, domain = value.split('@', 2)
|
|
|
|
return nil if domain.nil?
|
|
|
|
TagManager.instance.normalize_domain(domain)
|
|
rescue Addressable::URI::InvalidURIError
|
|
nil
|
|
end
|
|
|
|
def on_allowlist?(domain)
|
|
return false if Rails.configuration.x.email_domains_whitelist.blank?
|
|
|
|
Rails.configuration.x.email_domains_whitelist.include?(domain)
|
|
end
|
|
|
|
def resolve_mx(domain)
|
|
hostnames = []
|
|
ips = []
|
|
|
|
Resolv::DNS.open do |dns|
|
|
dns.timeouts = 5
|
|
|
|
hostnames = dns.getresources(domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }
|
|
|
|
([domain] + hostnames).uniq.each do |hostname|
|
|
ips.concat(dns.getresources(hostname, Resolv::DNS::Resource::IN::A).to_a.map { |e| e.address.to_s })
|
|
ips.concat(dns.getresources(hostname, Resolv::DNS::Resource::IN::AAAA).to_a.map { |e| e.address.to_s })
|
|
end
|
|
end
|
|
|
|
[ips, hostnames]
|
|
end
|
|
|
|
def on_blacklist?(values)
|
|
EmailDomainBlock.where(domain: values.uniq).any?
|
|
end
|
|
end
|