ebe08f4335
* 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
131 lines
7 KiB
Ruby
131 lines
7 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', errors: double(add: nil)) }
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it 'does not add errors if there are no DNS records for an e-mail domain that is explicitly allowed' do
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old_whitelist = Rails.configuration.x.email_domains_whitelist
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Rails.configuration.x.email_domains_whitelist = '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([])
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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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Rails.configuration.x.email_domains_whitelist = old_whitelist
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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 exists but 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 A record is blacklisted' do
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EmailDomainBlock.create!(domain: '1.2.3.4')
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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([double(address: '1.2.3.4')])
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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 the AAAA record is blacklisted' do
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EmailDomainBlock.create!(domain: 'fd00::1')
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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([double(address: 'fd00::1')])
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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: '2.3.4.5')
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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([])
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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 IPv6 record is blacklisted' do
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EmailDomainBlock.create!(domain: 'fd00::2')
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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([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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it 'adds an error if the MX hostname 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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