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* Fix email with empty domain name labels passing validation `EmailMxValidator` would allow empty labels because `Resolv::DNS` is particularly lenient about them, but the email would be invalid and unusable. * Add tests
103 lines
5.2 KiB
Ruby
103 lines
5.2 KiB
Ruby
# frozen_string_literal: true
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require 'rails_helper'
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describe EmailMxValidator do
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describe '#validate' do
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let(:user) { double(email: 'foo@example.com', sign_up_ip: '1.2.3.4', errors: double(add: nil)) }
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context 'for an e-mail domain that is explicitly allowed' do
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around do |block|
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tmp = Rails.configuration.x.email_domains_whitelist
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Rails.configuration.x.email_domains_whitelist = 'example.com'
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block.call
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Rails.configuration.x.email_domains_whitelist = tmp
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end
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it 'does not add errors if there are no DNS records' do
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resolver = double
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([])
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allow(resolver).to receive(:timeouts=).and_return(nil)
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allow(Resolv::DNS).to receive(:open).and_yield(resolver)
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subject.validate(user)
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expect(user.errors).to_not have_received(:add)
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end
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end
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it 'adds no error if there are DNS records for the e-mail domain' do
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resolver = double
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([Resolv::DNS::Resource::IN::A.new('192.0.2.42')])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([])
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allow(resolver).to receive(:timeouts=).and_return(nil)
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allow(Resolv::DNS).to receive(:open).and_yield(resolver)
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subject.validate(user)
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expect(user.errors).not_to have_received(:add)
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end
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it 'adds an error if the email domain name contains empty labels' do
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resolver = double
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allow(resolver).to receive(:getresources).with('example..com', Resolv::DNS::Resource::IN::MX).and_return([])
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allow(resolver).to receive(:getresources).with('example..com', Resolv::DNS::Resource::IN::A).and_return([Resolv::DNS::Resource::IN::A.new('192.0.2.42')])
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allow(resolver).to receive(:getresources).with('example..com', Resolv::DNS::Resource::IN::AAAA).and_return([])
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allow(resolver).to receive(:timeouts=).and_return(nil)
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allow(Resolv::DNS).to receive(:open).and_yield(resolver)
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user = double(email: 'foo@example..com', sign_up_ip: '1.2.3.4', errors: double(add: nil))
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subject.validate(user)
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expect(user.errors).to have_received(:add)
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end
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it 'adds an error if there are no DNS records for the e-mail domain' do
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resolver = double
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([])
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allow(resolver).to receive(:timeouts=).and_return(nil)
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allow(Resolv::DNS).to receive(:open).and_yield(resolver)
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subject.validate(user)
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expect(user.errors).to have_received(:add)
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end
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it 'adds an error if a MX record does not lead to an IP' do
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resolver = double
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([double(exchange: 'mail.example.com')])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([])
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allow(resolver).to receive(:getresources).with('mail.example.com', Resolv::DNS::Resource::IN::A).and_return([])
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allow(resolver).to receive(:getresources).with('mail.example.com', Resolv::DNS::Resource::IN::AAAA).and_return([])
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allow(resolver).to receive(:timeouts=).and_return(nil)
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allow(Resolv::DNS).to receive(:open).and_yield(resolver)
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subject.validate(user)
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expect(user.errors).to have_received(:add)
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end
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it 'adds an error if the MX record is blacklisted' do
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EmailDomainBlock.create!(domain: 'mail.example.com')
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resolver = double
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([double(exchange: 'mail.example.com')])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([])
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allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([])
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allow(resolver).to receive(:getresources).with('mail.example.com', Resolv::DNS::Resource::IN::A).and_return([double(address: '2.3.4.5')])
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allow(resolver).to receive(:getresources).with('mail.example.com', Resolv::DNS::Resource::IN::AAAA).and_return([double(address: 'fd00::2')])
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allow(resolver).to receive(:timeouts=).and_return(nil)
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allow(Resolv::DNS).to receive(:open).and_yield(resolver)
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subject.validate(user)
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expect(user.errors).to have_received(:add)
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end
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end
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end
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