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# frozen_string_literal: true
require 'spec_helper'
describe SshHostKey do
using RSpec::Parameterized::TableSyntax
include ReactiveCachingHelpers
let(:key1) do
'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC3UpyF2iLqy1d63M6k3jH1vuEnq/NWtE+o' \
'rJe1Xn7JoRbduKd6zpsJ0JhBGWgcQK0ph0aGW5PcudzzBSc+SlYfCc4GTaxDtmj41hW0o72m' \
'NiuDW3oKXXShOiVRde2ZOquH8Z865jGiZIC8BI/bXZD29IGUih0hPu7Rjp70VYiE+35QRf/p' \
'sD0Ddrz8QUIG3A/2dMzLI5F5ZORk3BIX2F3mJwJOvZxRhR/SqyphDMZ5eZ0EzqbFBCDE6HAB' \
'Woz9ck8RBGLvCIggmDHj3FmMLcQGMDiy6wKp7QdnBtxjCP6vtE6YPUM223AqsWt+9NTtCfB8' \
'YdNAH7YcHHOR1FgtSk1x'
end
let(:key2) do
'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDLIp+4ciR2YO9f9rpldc7InNQw/TBUtcNb' \
'J2XR0rr15/5ytz7YM16xXG0Qjx576PNSmqs4gbTrvTuFZak+v1Jx/9deHRq/yqp9f+tv33+i' \
'aJGCQCX/+OVY7aWgV2R9YsS7XQ4mnv4XlOTEssib/rGAIT+ATd/GcdYSEOO+dh4O09/6O/jI' \
'MGSeP+NNetgn1nPCnLOjrXFZUnUtNDi6EEKeIlrliJjSb7Jr4f7gjvZnv4RskWHHFo8FgAAq' \
't0gOMT6EmKrnypBe2vLGSAXbtkXr01q6/DNPH+n9VA1LTV6v1KN/W5CN5tQV11wRSKiM8g5O' \
'Ebi86VjJRi2sOuYoXQU1'
end
# Purposefully ordered so that `sort` will make changes
let(:known_hosts) do
<<~EOF
example.com #{key1} git@localhost
@revoked other.example.com #{key2} git@localhost
EOF
end
let(:extra) { known_hosts + "foo\nbar\n" }
let(:reversed) { known_hosts.lines.reverse.join }
let(:compare_host_keys) { nil }
def stub_ssh_keyscan(args, status: true, stdout: "", stderr: "")
stdin = StringIO.new
stdout = double(:stdout, read: stdout)
stderr = double(:stderr, read: stderr)
wait_thr = double(:wait_thr, value: double(success?: status))
expect(Open3).to receive(:popen3).with({}, 'ssh-keyscan', *args).and_yield(stdin, stdout, stderr, wait_thr)
stdin
end
let(:project) { build(:project) }
subject(:ssh_host_key) { described_class.new(project: project, url: 'ssh://example.com:2222', compare_host_keys: compare_host_keys) }
describe '.primary_key' do
it 'returns a symbol' do
expect(described_class.primary_key).to eq(:id)
end
end
describe '.find_by' do
let(:project) { create(:project) }
let(:url) { 'ssh://invalid.invalid:2222' }
let(:finding_id) { [project.id, url].join(':') }
it 'accepts a string key' do
result = described_class.find_by('id' => finding_id)
expect(result).to be_a(described_class)
expect(result.project).to eq(project)
expect(result.url.to_s).to eq(url)
end
it 'accepts a symbol key' do
result = described_class.find_by(id: finding_id)
expect(result).to be_a(described_class)
expect(result.project).to eq(project)
expect(result.url.to_s).to eq(url)
end
end
describe '#fingerprints', :use_clean_rails_memory_store_caching do
it 'returns an array of indexed fingerprints when the cache is filled' do
stub_reactive_cache(ssh_host_key, known_hosts: known_hosts)
expected = [key1, key2]
.map { |data| Gitlab::SSHPublicKey.new(data) }
.each_with_index
.map { |key, i| { bits: key.bits, fingerprint: key.fingerprint, type: key.type, index: i } }
expect(ssh_host_key.fingerprints.as_json).to eq(expected)
end
it 'returns an empty array when the cache is empty' do
expect(ssh_host_key.fingerprints).to eq([])
end
end
describe '#fingerprints', :use_clean_rails_memory_store_caching do
it 'returns an array of indexed fingerprints when the cache is filled' do
stub_reactive_cache(ssh_host_key, known_hosts: known_hosts)
expect(ssh_host_key.fingerprints.as_json).to eq(
[
{ bits: 2048, fingerprint: Gitlab::SSHPublicKey.new(key1).fingerprint, type: :rsa, index: 0 },
{ bits: 2048, fingerprint: Gitlab::SSHPublicKey.new(key2).fingerprint, type: :rsa, index: 1 }
]
)
end
it 'returns an empty array when the cache is empty' do
expect(ssh_host_key.fingerprints).to eq([])
end
end
describe '#host_keys_changed?' do
where(:known_hosts_a, :known_hosts_b, :result) do
known_hosts | extra | true
known_hosts | "foo\n" | true
known_hosts | '' | true
known_hosts | nil | true
known_hosts | known_hosts | false
reversed | known_hosts | false
extra | "foo\n" | true
'' | '' | false
nil | nil | false
'' | nil | false
end
with_them do
let(:compare_host_keys) { known_hosts_b }
subject { ssh_host_key.host_keys_changed? }
context '(normal)' do
let(:compare_host_keys) { known_hosts_b }
before do
expect(ssh_host_key).to receive(:known_hosts).and_return(known_hosts_a)
end
it { is_expected.to eq(result) }
end
# Comparisons should be symmetrical, so test the reverse too
context '(reversed)' do
let(:compare_host_keys) { known_hosts_a }
before do
expect(ssh_host_key).to receive(:known_hosts).and_return(known_hosts_b)
end
it { is_expected.to eq(result) }
end
end
end
describe '#calculate_reactive_cache' do
subject(:cache) { ssh_host_key.calculate_reactive_cache }
it 'writes the hostname to STDIN' do
stdin = stub_ssh_keyscan(%w[-T 5 -p 2222 -f-])
cache
expect(stdin.string).to eq("example.com\n")
end
context 'successful key scan' do
it 'stores the cleaned known_hosts data' do
stub_ssh_keyscan(%w[-T 5 -p 2222 -f-], stdout: "KEY 1\nKEY 1\n\n# comment\nKEY 2\n")
is_expected.to eq(known_hosts: "KEY 1\nKEY 2\n")
end
end
context 'failed key scan (exit code 1)' do
it 'returns a generic error' do
stub_ssh_keyscan(%w[-T 5 -p 2222 -f-], stdout: 'blarg', status: false)
is_expected.to eq(error: 'Failed to detect SSH host keys')
end
end
context 'failed key scan (exit code 0)' do
it 'returns a generic error' do
stub_ssh_keyscan(%w[-T 5 -p 2222 -f-], stderr: 'Unknown host')
is_expected.to eq(error: 'Failed to detect SSH host keys')
end
end
end
end
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