1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
# frozen_string_literal: true
module DnsHelpers
def block_dns!
stub_all_dns!
stub_invalid_dns!
permit_local_dns!
permit_postgresql!
end
def permit_dns!
allow(Addrinfo).to receive(:getaddrinfo).and_call_original
end
def stub_all_dns!
allow(Addrinfo).to receive(:getaddrinfo).with(anything, anything, nil, :STREAM).and_return([])
allow(Addrinfo).to receive(:getaddrinfo).with(anything, anything, nil, :STREAM, anything, anything).and_return([])
end
def stub_invalid_dns!
allow(Addrinfo).to receive(:getaddrinfo).with(/\Afoobar\.\w|(\d{1,3}\.){4,}\d{1,3}\z/i, anything, nil, :STREAM) do
raise SocketError, "getaddrinfo: Name or service not known"
end
end
def permit_local_dns!
local_addresses = %r{
\A
::1? | # IPV6
(127|10)\.0\.0\.\d{1,3} | # 127.0.0.x or 10.0.0.x local network
192\.168\.\d{1,3}\.\d{1,3} | # 192.168.x.x local network
172\.(1[6-9]|2[0-9]|3[0-1])\.\d{1,3}\.\d{1,3} | # 172.16.x.x - 172.31.x.x local network
0\.0\.0\.0 | # loopback
localhost
\z
}xi
allow(Addrinfo).to receive(:getaddrinfo).with(local_addresses, anything, nil, :STREAM).and_call_original
allow(Addrinfo).to receive(:getaddrinfo).with(local_addresses, anything, nil, :STREAM, anything, anything, any_args).and_call_original
end
# pg v1.4.0, unlike v1.3.5, uses AddrInfo.getaddrinfo to resolve IPv4 and IPv6 addresses:
# https://github.com/ged/ruby-pg/pull/459
def permit_postgresql!
db_hosts.each do |host|
next if host.start_with?('/') # Exclude UNIX sockets
# https://github.com/ged/ruby-pg/blob/252512608a814de16bbad55911f9bbcef0e73cb9/lib/pg/connection.rb#L720
allow(Addrinfo).to receive(:getaddrinfo).with(host, anything, nil, :STREAM).and_call_original
end
end
def db_hosts
ActiveRecord::Base.configurations.configs_for(env_name: Rails.env).map(&:host).compact.uniq
end
def stub_resolver(stubbed_lookups = {})
resolver = instance_double('Resolv::DNS')
allow(resolver).to receive(:timeouts=)
expect(Resolv::DNS).to receive(:open).and_yield(resolver)
allow(resolver).to receive(:getresources).and_return([])
stubbed_lookups.each do |domain, records|
records = Array(records).map { |txt| Resolv::DNS::Resource::IN::TXT.new(txt) }
# Append '.' to domain_name, indicating absolute FQDN
allow(resolver).to receive(:getresources).with("#{domain}.", Resolv::DNS::Resource::IN::TXT) { records }
end
resolver
end
end
|