debian-mirror-gitlab/spec/lib/gitlab/url_blocker_spec.rb

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# frozen_string_literal: true
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require 'spec_helper'
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describe Gitlab::UrlBlocker, :stub_invalid_dns_only do
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include StubRequests
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describe '#validate!' do
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subject { described_class.validate!(import_url) }
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shared_examples 'validates URI and hostname' do
it 'runs the url validations' do
uri, hostname = subject
expect(uri).to eq(Addressable::URI.parse(expected_uri))
expect(hostname).to eq(expected_hostname)
end
end
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context 'when URI is nil' do
let(:import_url) { nil }
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it_behaves_like 'validates URI and hostname' do
let(:expected_uri) { nil }
let(:expected_hostname) { nil }
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end
end
context 'when URI is internal' do
let(:import_url) { 'http://localhost' }
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before do
stub_dns(import_url, ip_address: '127.0.0.1')
end
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it_behaves_like 'validates URI and hostname' do
let(:expected_uri) { 'http://127.0.0.1' }
let(:expected_hostname) { 'localhost' }
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end
end
context 'when the URL hostname is a domain' do
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context 'when domain can be resolved' do
let(:import_url) { 'https://example.org' }
before do
stub_dns(import_url, ip_address: '93.184.216.34')
end
it_behaves_like 'validates URI and hostname' do
let(:expected_uri) { 'https://93.184.216.34' }
let(:expected_hostname) { 'example.org' }
end
end
context 'when domain cannot be resolved' do
let(:import_url) { 'http://foobar.x' }
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it 'raises an error' do
stub_env('RSPEC_ALLOW_INVALID_URLS', 'false')
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expect { subject }.to raise_error(described_class::BlockedUrlError)
end
end
context 'when domain is too long' do
let(:import_url) { 'https://example' + 'a' * 1024 + '.com' }
it 'raises an error' do
expect { subject }.to raise_error(described_class::BlockedUrlError)
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end
end
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end
context 'when the URL hostname is an IP address' do
let(:import_url) { 'https://93.184.216.34' }
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it_behaves_like 'validates URI and hostname' do
let(:expected_uri) { import_url }
let(:expected_hostname) { nil }
end
context 'when the address is invalid' do
let(:import_url) { 'http://1.1.1.1.1' }
it 'raises an error' do
stub_env('RSPEC_ALLOW_INVALID_URLS', 'false')
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expect { subject }.to raise_error(described_class::BlockedUrlError)
end
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end
end
context 'disabled DNS rebinding protection' do
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subject { described_class.validate!(import_url, dns_rebind_protection: false) }
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context 'when URI is internal' do
let(:import_url) { 'http://localhost' }
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it_behaves_like 'validates URI and hostname' do
let(:expected_uri) { import_url }
let(:expected_hostname) { nil }
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end
end
context 'when the URL hostname is a domain' do
let(:import_url) { 'https://example.org' }
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before do
stub_env('RSPEC_ALLOW_INVALID_URLS', 'false')
end
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context 'when domain can be resolved' do
it_behaves_like 'validates URI and hostname' do
let(:expected_uri) { import_url }
let(:expected_hostname) { nil }
end
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end
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context 'when domain cannot be resolved' do
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let(:import_url) { 'http://foobar.x' }
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it_behaves_like 'validates URI and hostname' do
let(:expected_uri) { import_url }
let(:expected_hostname) { nil }
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end
end
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end
context 'when the URL hostname is an IP address' do
let(:import_url) { 'https://93.184.216.34' }
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it_behaves_like 'validates URI and hostname' do
let(:expected_uri) { import_url }
let(:expected_hostname) { nil }
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end
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context 'when it is invalid' do
let(:import_url) { 'http://1.1.1.1.1' }
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it_behaves_like 'validates URI and hostname' do
let(:expected_uri) { import_url }
let(:expected_hostname) { nil }
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end
end
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end
end
end
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describe '#blocked_url?' do
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let(:ports) { Project::VALID_IMPORT_PORTS }
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it 'allows imports from configured web host and port' do
import_url = "http://#{Gitlab.config.gitlab.host}:#{Gitlab.config.gitlab.port}/t.git"
expect(described_class.blocked_url?(import_url)).to be false
end
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it 'allows mirroring from configured SSH host and port' do
import_url = "ssh://#{Gitlab.config.gitlab_shell.ssh_host}:#{Gitlab.config.gitlab_shell.ssh_port}/t.git"
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expect(described_class.blocked_url?(import_url)).to be false
end
it 'returns true for bad localhost hostname' do
expect(described_class.blocked_url?('https://localhost:65535/foo/foo.git')).to be true
end
it 'returns true for bad port' do
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expect(described_class.blocked_url?('https://gitlab.com:25/foo/foo.git', ports: ports)).to be true
end
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it 'returns true for bad scheme' do
expect(described_class.blocked_url?('https://gitlab.com/foo/foo.git', schemes: ['https'])).to be false
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expect(described_class.blocked_url?('https://gitlab.com/foo/foo.git')).to be false
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expect(described_class.blocked_url?('https://gitlab.com/foo/foo.git', schemes: ['http'])).to be true
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end
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it 'returns true for bad protocol on configured web/SSH host and ports' do
web_url = "javascript://#{Gitlab.config.gitlab.host}:#{Gitlab.config.gitlab.port}/t.git%0aalert(1)"
expect(described_class.blocked_url?(web_url)).to be true
ssh_url = "javascript://#{Gitlab.config.gitlab_shell.ssh_host}:#{Gitlab.config.gitlab_shell.ssh_port}/t.git%0aalert(1)"
expect(described_class.blocked_url?(ssh_url)).to be true
end
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it 'returns true for localhost IPs' do
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expect(described_class.blocked_url?('https://[0:0:0:0:0:0:0:0]/foo/foo.git')).to be true
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expect(described_class.blocked_url?('https://0.0.0.0/foo/foo.git')).to be true
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expect(described_class.blocked_url?('https://[::]/foo/foo.git')).to be true
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end
it 'returns true for loopback IP' do
expect(described_class.blocked_url?('https://127.0.0.2/foo/foo.git')).to be true
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expect(described_class.blocked_url?('https://127.0.0.1/foo/foo.git')).to be true
expect(described_class.blocked_url?('https://[::1]/foo/foo.git')).to be true
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end
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it 'returns true for alternative version of 127.0.0.1 (0177.1)' do
expect(described_class.blocked_url?('https://0177.1:65535/foo/foo.git')).to be true
end
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it 'returns true for alternative version of 127.0.0.1 (017700000001)' do
expect(described_class.blocked_url?('https://017700000001:65535/foo/foo.git')).to be true
end
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it 'returns true for alternative version of 127.0.0.1 (0x7f.1)' do
expect(described_class.blocked_url?('https://0x7f.1:65535/foo/foo.git')).to be true
end
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it 'returns true for alternative version of 127.0.0.1 (0x7f.0.0.1)' do
expect(described_class.blocked_url?('https://0x7f.0.0.1:65535/foo/foo.git')).to be true
end
it 'returns true for alternative version of 127.0.0.1 (0x7f000001)' do
expect(described_class.blocked_url?('https://0x7f000001:65535/foo/foo.git')).to be true
end
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it 'returns true for alternative version of 127.0.0.1 (2130706433)' do
expect(described_class.blocked_url?('https://2130706433:65535/foo/foo.git')).to be true
end
it 'returns true for alternative version of 127.0.0.1 (127.000.000.001)' do
expect(described_class.blocked_url?('https://127.000.000.001:65535/foo/foo.git')).to be true
end
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it 'returns true for alternative version of 127.0.0.1 (127.0.1)' do
expect(described_class.blocked_url?('https://127.0.1:65535/foo/foo.git')).to be true
end
context 'with ipv6 mapped address' do
it 'returns true for localhost IPs' do
expect(described_class.blocked_url?('https://[0:0:0:0:0:ffff:0.0.0.0]/foo/foo.git')).to be true
expect(described_class.blocked_url?('https://[::ffff:0.0.0.0]/foo/foo.git')).to be true
expect(described_class.blocked_url?('https://[::ffff:0:0]/foo/foo.git')).to be true
end
it 'returns true for loopback IPs' do
expect(described_class.blocked_url?('https://[0:0:0:0:0:ffff:127.0.0.1]/foo/foo.git')).to be true
expect(described_class.blocked_url?('https://[::ffff:127.0.0.1]/foo/foo.git')).to be true
expect(described_class.blocked_url?('https://[::ffff:7f00:1]/foo/foo.git')).to be true
expect(described_class.blocked_url?('https://[0:0:0:0:0:ffff:127.0.0.2]/foo/foo.git')).to be true
expect(described_class.blocked_url?('https://[::ffff:127.0.0.2]/foo/foo.git')).to be true
expect(described_class.blocked_url?('https://[::ffff:7f00:2]/foo/foo.git')).to be true
end
end
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it 'returns true for a non-alphanumeric hostname' do
aggregate_failures do
expect(described_class).to be_blocked_url('ssh://-oProxyCommand=whoami/a')
# The leading character here is a Unicode "soft hyphen"
expect(described_class).to be_blocked_url('ssh://­oProxyCommand=whoami/a')
# Unicode alphanumerics are allowed
expect(described_class).not_to be_blocked_url('ssh://ğitlab.com/a')
end
end
it 'returns true for invalid URL' do
expect(described_class.blocked_url?('http://:8080')).to be true
end
it 'returns false for legitimate URL' do
expect(described_class.blocked_url?('https://gitlab.com/foo/foo.git')).to be false
end
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context 'when allow_local_network is' do
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let(:local_ips) do
[
'192.168.1.2',
'[0:0:0:0:0:ffff:192.168.1.2]',
'[::ffff:c0a8:102]',
'10.0.0.2',
'[0:0:0:0:0:ffff:10.0.0.2]',
'[::ffff:a00:2]',
'172.16.0.2',
'[0:0:0:0:0:ffff:172.16.0.2]',
'[::ffff:ac10:20]',
'[feef::1]',
'[fee2::]',
'[fc00:bf8b:e62c:abcd:abcd:aaaa:aaaa:aaaa]'
]
end
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let(:fake_domain) { 'www.fakedomain.fake' }
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shared_examples 'allows local requests' do |url_blocker_attributes|
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it 'does not block urls from private networks' do
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local_ips.each do |ip|
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stub_domain_resolv(fake_domain, ip) do
expect(described_class).not_to be_blocked_url("http://#{fake_domain}", url_blocker_attributes)
end
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expect(described_class).not_to be_blocked_url("http://#{ip}", url_blocker_attributes)
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end
end
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it 'allows localhost endpoints' do
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expect(described_class).not_to be_blocked_url('http://0.0.0.0', url_blocker_attributes)
expect(described_class).not_to be_blocked_url('http://localhost', url_blocker_attributes)
expect(described_class).not_to be_blocked_url('http://127.0.0.1', url_blocker_attributes)
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end
it 'allows loopback endpoints' do
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expect(described_class).not_to be_blocked_url('http://127.0.0.2', url_blocker_attributes)
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end
it 'allows IPv4 link-local endpoints' do
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expect(described_class).not_to be_blocked_url('http://169.254.169.254', url_blocker_attributes)
expect(described_class).not_to be_blocked_url('http://169.254.168.100', url_blocker_attributes)
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end
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it 'allows IPv6 link-local endpoints' do
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expect(described_class).not_to be_blocked_url('http://[0:0:0:0:0:ffff:169.254.169.254]', url_blocker_attributes)
expect(described_class).not_to be_blocked_url('http://[::ffff:169.254.169.254]', url_blocker_attributes)
expect(described_class).not_to be_blocked_url('http://[::ffff:a9fe:a9fe]', url_blocker_attributes)
expect(described_class).not_to be_blocked_url('http://[0:0:0:0:0:ffff:169.254.168.100]', url_blocker_attributes)
expect(described_class).not_to be_blocked_url('http://[::ffff:169.254.168.100]', url_blocker_attributes)
expect(described_class).not_to be_blocked_url('http://[::ffff:a9fe:a864]', url_blocker_attributes)
expect(described_class).not_to be_blocked_url('http://[fe80::c800:eff:fe74:8]', url_blocker_attributes)
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end
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end
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context 'true (default)' do
it_behaves_like 'allows local requests', { allow_localhost: true, allow_local_network: true }
end
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context 'false' do
it 'blocks urls from private networks' do
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local_ips.each do |ip|
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stub_domain_resolv(fake_domain, ip) do
expect(described_class).to be_blocked_url("http://#{fake_domain}", allow_local_network: false)
end
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expect(described_class).to be_blocked_url("http://#{ip}", allow_local_network: false)
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end
end
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it 'blocks IPv4 link-local endpoints' do
expect(described_class).to be_blocked_url('http://169.254.169.254', allow_local_network: false)
expect(described_class).to be_blocked_url('http://169.254.168.100', allow_local_network: false)
end
it 'blocks IPv6 link-local endpoints' do
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expect(described_class).to be_blocked_url('http://[0:0:0:0:0:ffff:169.254.169.254]', allow_local_network: false)
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expect(described_class).to be_blocked_url('http://[::ffff:169.254.169.254]', allow_local_network: false)
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expect(described_class).to be_blocked_url('http://[::ffff:a9fe:a9fe]', allow_local_network: false)
expect(described_class).to be_blocked_url('http://[0:0:0:0:0:ffff:169.254.168.100]', allow_local_network: false)
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expect(described_class).to be_blocked_url('http://[::ffff:169.254.168.100]', allow_local_network: false)
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expect(described_class).to be_blocked_url('http://[::ffff:a9fe:a864]', allow_local_network: false)
expect(described_class).to be_blocked_url('http://[fe80::c800:eff:fe74:8]', allow_local_network: false)
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end
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context 'when local domain/IP is whitelisted' do
let(:url_blocker_attributes) do
{
allow_localhost: false,
allow_local_network: false
}
end
before do
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allow(ApplicationSetting).to receive(:current).and_return(ApplicationSetting.new)
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stub_application_setting(outbound_local_requests_whitelist: whitelist)
end
context 'with IPs in whitelist' do
let(:whitelist) do
[
'0.0.0.0',
'127.0.0.1',
'127.0.0.2',
'192.168.1.1',
'192.168.1.2',
'0:0:0:0:0:ffff:192.168.1.2',
'::ffff:c0a8:102',
'10.0.0.2',
'0:0:0:0:0:ffff:10.0.0.2',
'::ffff:a00:2',
'172.16.0.2',
'0:0:0:0:0:ffff:172.16.0.2',
'::ffff:ac10:20',
'feef::1',
'fee2::',
'fc00:bf8b:e62c:abcd:abcd:aaaa:aaaa:aaaa',
'0:0:0:0:0:ffff:169.254.169.254',
'::ffff:a9fe:a9fe',
'::ffff:169.254.168.100',
'::ffff:a9fe:a864',
'fe80::c800:eff:fe74:8',
# garbage IPs
'45645632345',
'garbage456:more345gar:bage'
]
end
it_behaves_like 'allows local requests', { allow_localhost: false, allow_local_network: false }
it 'whitelists IP when dns_rebind_protection is disabled' do
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url = "http://example.com"
attrs = url_blocker_attributes.merge(dns_rebind_protection: false)
stub_domain_resolv('example.com', '192.168.1.2') do
expect(described_class).not_to be_blocked_url(url, attrs)
end
stub_domain_resolv('example.com', '192.168.1.3') do
expect(described_class).to be_blocked_url(url, attrs)
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end
end
end
context 'with domains in whitelist' do
let(:whitelist) do
[
'www.example.com',
'example.com',
'xn--itlab-j1a.com',
'garbage$^$%#$^&$'
]
end
it 'allows domains present in whitelist' do
domain = 'example.com'
subdomain1 = 'www.example.com'
subdomain2 = 'subdomain.example.com'
stub_domain_resolv(domain, '192.168.1.1') do
expect(described_class).not_to be_blocked_url("http://#{domain}",
url_blocker_attributes)
end
stub_domain_resolv(subdomain1, '192.168.1.1') do
expect(described_class).not_to be_blocked_url("http://#{subdomain1}",
url_blocker_attributes)
end
# subdomain2 is not part of the whitelist so it should be blocked
stub_domain_resolv(subdomain2, '192.168.1.1') do
expect(described_class).to be_blocked_url("http://#{subdomain2}",
url_blocker_attributes)
end
end
it 'works with unicode and idna encoded domains' do
unicode_domain = 'ğitlab.com'
idna_encoded_domain = 'xn--itlab-j1a.com'
stub_domain_resolv(unicode_domain, '192.168.1.1') do
expect(described_class).not_to be_blocked_url("http://#{unicode_domain}",
url_blocker_attributes)
end
stub_domain_resolv(idna_encoded_domain, '192.168.1.1') do
expect(described_class).not_to be_blocked_url("http://#{idna_encoded_domain}",
url_blocker_attributes)
end
end
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shared_examples 'dns rebinding checks' do
shared_examples 'whitelists the domain' do
let(:whitelist) { [domain] }
let(:url) { "http://#{domain}" }
before do
stub_env('RSPEC_ALLOW_INVALID_URLS', 'false')
end
it do
expect(described_class).not_to be_blocked_url(url, dns_rebind_protection: dns_rebind_value)
end
end
context 'when dns_rebinding_setting is' do
context 'enabled' do
let(:dns_rebind_value) { true }
it_behaves_like 'whitelists the domain'
end
context 'disabled' do
let(:dns_rebind_value) { false }
it_behaves_like 'whitelists the domain'
end
end
end
context 'when the domain cannot be resolved' do
let(:domain) { 'foobar.x' }
it_behaves_like 'dns rebinding checks'
end
context 'when the domain can be resolved' do
let(:domain) { 'example.com' }
before do
stub_dns(url, ip_address: '93.184.216.34')
end
it_behaves_like 'dns rebinding checks'
end
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end
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context 'with ports' do
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let(:whitelist) do
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["127.0.0.1:2000"]
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end
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it 'allows domain with port when resolved ip has port whitelisted' do
stub_domain_resolv("www.resolve-domain.com", '127.0.0.1') do
expect(described_class).not_to be_blocked_url("http://www.resolve-domain.com:2000", url_blocker_attributes)
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end
end
end
end
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end
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def stub_domain_resolv(domain, ip, port = 80, &block)
address = instance_double(Addrinfo,
ip_address: ip,
ipv4_private?: true,
ipv6_linklocal?: false,
ipv4_loopback?: false,
ipv6_loopback?: false,
ipv4?: false,
ip_port: port
)
allow(Addrinfo).to receive(:getaddrinfo).with(domain, port, any_args).and_return([address])
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allow(address).to receive(:ipv6_v4mapped?).and_return(false)
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yield
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allow(Addrinfo).to receive(:getaddrinfo).and_call_original
end
end
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context 'when enforce_user is' do
context 'false (default)' do
it 'does not block urls with a non-alphanumeric username' do
expect(described_class).not_to be_blocked_url('ssh://-oProxyCommand=whoami@example.com/a')
# The leading character here is a Unicode "soft hyphen"
expect(described_class).not_to be_blocked_url('ssh://­oProxyCommand=whoami@example.com/a')
# Unicode alphanumerics are allowed
expect(described_class).not_to be_blocked_url('ssh://ğitlab@example.com/a')
end
end
context 'true' do
it 'blocks urls with a non-alphanumeric username' do
aggregate_failures do
expect(described_class).to be_blocked_url('ssh://-oProxyCommand=whoami@example.com/a', enforce_user: true)
# The leading character here is a Unicode "soft hyphen"
expect(described_class).to be_blocked_url('ssh://­oProxyCommand=whoami@example.com/a', enforce_user: true)
# Unicode alphanumerics are allowed
expect(described_class).not_to be_blocked_url('ssh://ğitlab@example.com/a', enforce_user: true)
end
end
end
end
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context 'when ascii_only is true' do
it 'returns true for unicode domain' do
expect(described_class.blocked_url?('https://𝕘itαƄ.com/foo/foo.bar', ascii_only: true)).to be true
end
it 'returns true for unicode tld' do
expect(described_class.blocked_url?('https://gitlab.ο/foo/foo.bar', ascii_only: true)).to be true
end
it 'returns true for unicode path' do
expect(described_class.blocked_url?('https://gitlab.com/𝒇οο/𝒇οο.Ƅα', ascii_only: true)).to be true
end
it 'returns true for IDNA deviations' do
expect(described_class.blocked_url?('https://mißile.com/foo/foo.bar', ascii_only: true)).to be true
expect(described_class.blocked_url?('https://miςςile.com/foo/foo.bar', ascii_only: true)).to be true
expect(described_class.blocked_url?('https://gitlab.com/foo/foo.bar', ascii_only: true)).to be true
expect(described_class.blocked_url?('https://gitlab.com/foo/foo.bar', ascii_only: true)).to be true
end
end
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it 'blocks urls with invalid ip address' do
stub_env('RSPEC_ALLOW_INVALID_URLS', 'false')
expect(described_class).to be_blocked_url('http://8.8.8.8.8')
end
it 'blocks urls whose hostname cannot be resolved' do
stub_env('RSPEC_ALLOW_INVALID_URLS', 'false')
expect(described_class).to be_blocked_url('http://foobar.x')
end
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end
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describe '#validate_hostname' do
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let(:ip_addresses) do
[
'2001:db8:1f70::999:de8:7648:6e8',
'FE80::C800:EFF:FE74:8',
'::ffff:127.0.0.1',
'::ffff:169.254.168.100',
'::ffff:7f00:1',
'0:0:0:0:0:ffff:0.0.0.0',
'localhost',
'127.0.0.1',
'127.000.000.001',
'0x7f000001',
'0x7f.0.0.1',
'0x7f.0.0.1',
'017700000001',
'0177.1',
'2130706433',
'::',
'::1'
]
end
it 'does not raise error for valid Ip addresses' do
ip_addresses.each do |ip|
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expect { described_class.send(:validate_hostname, ip) }.not_to raise_error
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end
end
end
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end