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consul/sdk/iptables/iptables_test.go

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package iptables
import (
"strings"
"testing"
"github.com/stretchr/testify/require"
)
func TestSetup(t *testing.T) {
cases := []struct {
name string
cfg Config
expectedRules []string
}{
{
"no proxy outbound port provided",
Config{
ProxyUserID: "123",
ProxyInboundPort: 20000,
IptablesProvider: &fakeIptablesProvider{},
},
[]string{
"iptables -t nat -N CONSUL_PROXY_INBOUND",
"iptables -t nat -N CONSUL_PROXY_IN_REDIRECT",
"iptables -t nat -N CONSUL_PROXY_OUTPUT",
"iptables -t nat -N CONSUL_PROXY_REDIRECT",
"iptables -t nat -N CONSUL_DNS_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_REDIRECT -p tcp -j REDIRECT --to-port 15001",
"iptables -t nat -A OUTPUT -p tcp -j CONSUL_PROXY_OUTPUT",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -m owner --uid-owner 123 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -d 127.0.0.1/32 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -j CONSUL_PROXY_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_IN_REDIRECT -p tcp -j REDIRECT --to-port 20000",
"iptables -t nat -A PREROUTING -p tcp -j CONSUL_PROXY_INBOUND",
"iptables -t nat -A CONSUL_PROXY_INBOUND -p tcp -j CONSUL_PROXY_IN_REDIRECT",
},
},
{
"Consul DNS IP provided",
Config{
ProxyUserID: "123",
ProxyInboundPort: 20000,
ConsulDNSIP: "10.0.34.16",
IptablesProvider: &fakeIptablesProvider{},
},
[]string{
"iptables -t nat -N CONSUL_PROXY_INBOUND",
"iptables -t nat -N CONSUL_PROXY_IN_REDIRECT",
"iptables -t nat -N CONSUL_PROXY_OUTPUT",
"iptables -t nat -N CONSUL_PROXY_REDIRECT",
"iptables -t nat -N CONSUL_DNS_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_REDIRECT -p tcp -j REDIRECT --to-port 15001",
"iptables -t nat -A CONSUL_DNS_REDIRECT -p udp --dport 53 -j DNAT --to-destination 10.0.34.16",
"iptables -t nat -A CONSUL_DNS_REDIRECT -p tcp --dport 53 -j DNAT --to-destination 10.0.34.16",
"iptables -t nat -A OUTPUT -p udp --dport 53 -j CONSUL_DNS_REDIRECT",
"iptables -t nat -A OUTPUT -p tcp --dport 53 -j CONSUL_DNS_REDIRECT",
"iptables -t nat -A OUTPUT -p tcp -j CONSUL_PROXY_OUTPUT",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -m owner --uid-owner 123 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -d 127.0.0.1/32 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -j CONSUL_PROXY_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_IN_REDIRECT -p tcp -j REDIRECT --to-port 20000",
"iptables -t nat -A PREROUTING -p tcp -j CONSUL_PROXY_INBOUND",
"iptables -t nat -A CONSUL_PROXY_INBOUND -p tcp -j CONSUL_PROXY_IN_REDIRECT",
},
},
{
"proxy outbound port is provided",
Config{
ProxyUserID: "123",
ProxyInboundPort: 20000,
ProxyOutboundPort: 21000,
IptablesProvider: &fakeIptablesProvider{},
},
[]string{
"iptables -t nat -N CONSUL_PROXY_INBOUND",
"iptables -t nat -N CONSUL_PROXY_IN_REDIRECT",
"iptables -t nat -N CONSUL_PROXY_OUTPUT",
"iptables -t nat -N CONSUL_PROXY_REDIRECT",
"iptables -t nat -N CONSUL_DNS_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_REDIRECT -p tcp -j REDIRECT --to-port 21000",
"iptables -t nat -A OUTPUT -p tcp -j CONSUL_PROXY_OUTPUT",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -m owner --uid-owner 123 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -d 127.0.0.1/32 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -j CONSUL_PROXY_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_IN_REDIRECT -p tcp -j REDIRECT --to-port 20000",
"iptables -t nat -A PREROUTING -p tcp -j CONSUL_PROXY_INBOUND",
"iptables -t nat -A CONSUL_PROXY_INBOUND -p tcp -j CONSUL_PROXY_IN_REDIRECT",
},
},
{
"exclude inbound ports is set",
Config{
ProxyUserID: "123",
ProxyInboundPort: 20000,
ProxyOutboundPort: 21000,
ExcludeInboundPorts: []string{"22000", "22500"},
IptablesProvider: &fakeIptablesProvider{},
},
[]string{
"iptables -t nat -N CONSUL_PROXY_INBOUND",
"iptables -t nat -N CONSUL_PROXY_IN_REDIRECT",
"iptables -t nat -N CONSUL_PROXY_OUTPUT",
"iptables -t nat -N CONSUL_PROXY_REDIRECT",
"iptables -t nat -N CONSUL_DNS_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_REDIRECT -p tcp -j REDIRECT --to-port 21000",
"iptables -t nat -A OUTPUT -p tcp -j CONSUL_PROXY_OUTPUT",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -m owner --uid-owner 123 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -d 127.0.0.1/32 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -j CONSUL_PROXY_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_IN_REDIRECT -p tcp -j REDIRECT --to-port 20000",
"iptables -t nat -A PREROUTING -p tcp -j CONSUL_PROXY_INBOUND",
"iptables -t nat -A CONSUL_PROXY_INBOUND -p tcp -j CONSUL_PROXY_IN_REDIRECT",
"iptables -t nat -I CONSUL_PROXY_INBOUND -p tcp --dport 22000 -j RETURN",
"iptables -t nat -I CONSUL_PROXY_INBOUND -p tcp --dport 22500 -j RETURN",
},
},
{
"exclude outbound ports is set",
Config{
ProxyUserID: "123",
ProxyInboundPort: 20000,
ProxyOutboundPort: 21000,
ExcludeOutboundPorts: []string{"22000", "22500"},
IptablesProvider: &fakeIptablesProvider{},
},
[]string{
"iptables -t nat -N CONSUL_PROXY_INBOUND",
"iptables -t nat -N CONSUL_PROXY_IN_REDIRECT",
"iptables -t nat -N CONSUL_PROXY_OUTPUT",
"iptables -t nat -N CONSUL_PROXY_REDIRECT",
"iptables -t nat -N CONSUL_DNS_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_REDIRECT -p tcp -j REDIRECT --to-port 21000",
"iptables -t nat -A OUTPUT -p tcp -j CONSUL_PROXY_OUTPUT",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -m owner --uid-owner 123 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -d 127.0.0.1/32 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -j CONSUL_PROXY_REDIRECT",
"iptables -t nat -I CONSUL_PROXY_OUTPUT -p tcp --dport 22000 -j RETURN",
"iptables -t nat -I CONSUL_PROXY_OUTPUT -p tcp --dport 22500 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_IN_REDIRECT -p tcp -j REDIRECT --to-port 20000",
"iptables -t nat -A PREROUTING -p tcp -j CONSUL_PROXY_INBOUND",
"iptables -t nat -A CONSUL_PROXY_INBOUND -p tcp -j CONSUL_PROXY_IN_REDIRECT",
},
},
{
"exclude outbound CIDRs is set",
Config{
ProxyUserID: "123",
ProxyInboundPort: 20000,
ProxyOutboundPort: 21000,
ExcludeOutboundCIDRs: []string{"1.1.1.1", "2.2.2.2/24"},
IptablesProvider: &fakeIptablesProvider{},
},
[]string{
"iptables -t nat -N CONSUL_PROXY_INBOUND",
"iptables -t nat -N CONSUL_PROXY_IN_REDIRECT",
"iptables -t nat -N CONSUL_PROXY_OUTPUT",
"iptables -t nat -N CONSUL_PROXY_REDIRECT",
"iptables -t nat -N CONSUL_DNS_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_REDIRECT -p tcp -j REDIRECT --to-port 21000",
"iptables -t nat -A OUTPUT -p tcp -j CONSUL_PROXY_OUTPUT",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -m owner --uid-owner 123 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -d 127.0.0.1/32 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -j CONSUL_PROXY_REDIRECT",
"iptables -t nat -I CONSUL_PROXY_OUTPUT -d 1.1.1.1 -j RETURN",
"iptables -t nat -I CONSUL_PROXY_OUTPUT -d 2.2.2.2/24 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_IN_REDIRECT -p tcp -j REDIRECT --to-port 20000",
"iptables -t nat -A PREROUTING -p tcp -j CONSUL_PROXY_INBOUND",
"iptables -t nat -A CONSUL_PROXY_INBOUND -p tcp -j CONSUL_PROXY_IN_REDIRECT",
},
},
{
"exclude UIDs is set",
Config{
ProxyUserID: "123",
ProxyInboundPort: 20000,
ProxyOutboundPort: 21000,
ExcludeUIDs: []string{"456", "789"},
IptablesProvider: &fakeIptablesProvider{},
},
[]string{
"iptables -t nat -N CONSUL_PROXY_INBOUND",
"iptables -t nat -N CONSUL_PROXY_IN_REDIRECT",
"iptables -t nat -N CONSUL_PROXY_OUTPUT",
"iptables -t nat -N CONSUL_PROXY_REDIRECT",
"iptables -t nat -N CONSUL_DNS_REDIRECT",
"iptables -t nat -A CONSUL_PROXY_REDIRECT -p tcp -j REDIRECT --to-port 21000",
"iptables -t nat -A OUTPUT -p tcp -j CONSUL_PROXY_OUTPUT",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -m owner --uid-owner 123 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -d 127.0.0.1/32 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_OUTPUT -j CONSUL_PROXY_REDIRECT",
"iptables -t nat -I CONSUL_PROXY_OUTPUT -m owner --uid-owner 456 -j RETURN",
"iptables -t nat -I CONSUL_PROXY_OUTPUT -m owner --uid-owner 789 -j RETURN",
"iptables -t nat -A CONSUL_PROXY_IN_REDIRECT -p tcp -j REDIRECT --to-port 20000",
"iptables -t nat -A PREROUTING -p tcp -j CONSUL_PROXY_INBOUND",
"iptables -t nat -A CONSUL_PROXY_INBOUND -p tcp -j CONSUL_PROXY_IN_REDIRECT",
},
},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
err := Setup(c.cfg)
require.NoError(t, err)
require.Equal(t, c.expectedRules, c.cfg.IptablesProvider.Rules())
})
}
}
func TestSetup_errors(t *testing.T) {
cases := []struct {
name string
cfg Config
expErr string
}{
{
"no proxy UID",
Config{
IptablesProvider: &iptablesExecutor{},
},
"ProxyUserID is required to set up traffic redirection",
},
{
"no proxy inbound port",
Config{
ProxyUserID: "123",
ProxyOutboundPort: 21000,
IptablesProvider: &iptablesExecutor{},
},
"ProxyInboundPort is required to set up traffic redirection",
},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
err := Setup(c.cfg)
require.EqualError(t, err, c.expErr)
})
}
}
type fakeIptablesProvider struct {
rules []string
}
func (f *fakeIptablesProvider) AddRule(name string, args ...string) {
var rule []string
rule = append(rule, name)
rule = append(rule, args...)
f.rules = append(f.rules, strings.Join(rule, " "))
}
func (f *fakeIptablesProvider) ApplyRules() error {
return nil
}
func (f *fakeIptablesProvider) Rules() []string {
return f.rules
}
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