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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package dnssec
import (
"context"
"net"
"testing"
"time"
"github.com/algorand/go-algorand/test/partitiontest"
"github.com/miekg/dns"
"github.com/stretchr/testify/require"
)
func TestTrustChainBasic(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
r := makeTestResolver()
tch := makeTrustChain(r)
tch.trustedZones["."] = trustedZone{}
tch.trustedZones["org."] = trustedZone{}
tch.trustedZones["example.org."] = trustedZone{}
tch.trustedZones["com."] = trustedZone{}
tch.trustedZones["example.com."] = trustedZone{}
tch.removeSelfAndChildren("example.com.")
a.Equal(4, len(tch.trustedZones))
tch.removeSelfAndChildren("org.")
a.Equal(2, len(tch.trustedZones))
tch.removeSelfAndChildren(".")
a.Equal(0, len(tch.trustedZones))
tch.trustedZones["com."] = trustedZone{
zsk: make(map[uint16]dns.DNSKEY),
}
tch.trustedZones["com."].zsk[123] = dns.DNSKEY{Algorithm: 1}
key, found := tch.getDNSKey("com.", 123)
a.True(found)
a.NotEmpty(key)
key, found = tch.getDNSKey(".", 123)
a.False(found)
a.Empty(key)
}
func TestEnsureTrustChain(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
var err error
r := makeEmptyTestResolver()
rootKSK, rootKSKsk := getKey(".", dns.ZONE|dns.SEP)
rootZSK, rootZSKsk := getKey(".", dns.ZONE)
rootAnchor := rootKSK.ToDS(dns.SHA256)
// make . zone
err = r.updateDSRecord(".", &[]dns.DS{*rootAnchor}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord(".", rootKSK, rootKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord(".", rootZSK, rootZSKsk, time.Time{})
a.NoError(err)
testKSK, testKSKsk := getKey("test.", dns.ZONE|dns.SEP)
testZSK, testZSKsk := getKey("test.", dns.ZONE)
// make test. zone
err = r.updateDSRecord("test.", &[]dns.DS{*testKSK.ToDS(dns.SHA256)}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("test.", testKSK, testKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("test.", testZSK, testZSKsk, time.Time{})
a.NoError(err)
tch := makeTrustChain(r)
err = tch.ensure(context.Background(), "test.", []uint16{testZSK.KeyTag()})
a.NoError(err)
// ensure test harness works
// update test. KSK and . ZSK
testKSK, testKSKsk = getKey("test.", dns.ZONE|dns.SEP)
err = r.updateDSRecord("test.", &[]dns.DS{*testKSK.ToDS(dns.SHA256)}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("test.", testKSK, testKSKsk, time.Time{})
a.NoError(err)
rootZSK, rootZSKsk = getKey(".", dns.ZONE)
err = r.updateDNSKeyRecord(".", rootZSK, rootZSKsk, time.Time{})
a.NoError(err)
// check a brand new trust chain (no caches)
newCh := makeTrustChain(r)
err = newCh.ensure(context.Background(), "test.", []uint16{testZSK.KeyTag()})
a.NoError(err)
// check an old trust chain (with cached entires)
err = tch.ensure(context.Background(), "test.", []uint16{testZSK.KeyTag()})
a.NoError(err)
algoTestKSK, algoTestKSKsk := getKey("algo.test.", dns.ZONE|dns.SEP)
algoTestZSK, algoTestZSKsk := getKey("algo.test.", dns.ZONE)
// make algo.test. zone
err = r.updateDSRecord("algo.test.", &[]dns.DS{*algoTestKSK.ToDS(dns.SHA256)}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("algo.test.", algoTestKSK, algoTestKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("algo.test.", algoTestZSK, algoTestZSKsk, time.Time{})
a.NoError(err)
// check an old trust chain (with cached entires)
err = tch.ensure(context.Background(), "algo.test.", []uint16{algoTestZSK.KeyTag()})
a.NoError(err)
// ZSK rotation test
// 1. update test. ZSK
// 2. add new rand.test. zone => DS for rand.test. will be signed with new ZSK
// 3. build a trust chain for rand.test. => trigger cache outdated error and the chain update
// rotate test. ZSK
testZSK, testZSKsk = getKey("test.", dns.ZONE)
err = r.updateDNSKeyRecord("test.", testZSK, testZSKsk, time.Time{})
a.NoError(err)
randTestKSK, randTestKSKsk := getKey("rand.test.", dns.ZONE|dns.SEP)
randTestZSK, randTestZSKsk := getKey("rand.test.", dns.ZONE)
// make rand.test. zone
err = r.updateDSRecord("rand.test.", &[]dns.DS{*randTestKSK.ToDS(dns.SHA256)}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("rand.test.", randTestKSK, randTestKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("rand.test.", randTestZSK, randTestZSKsk, time.Time{})
a.NoError(err)
err = tch.ensure(context.Background(), "algo.test.", []uint16{algoTestZSK.KeyTag()})
a.NoError(err)
err = tch.ensure(context.Background(), "rand.test.", []uint16{randTestZSK.KeyTag()})
a.NoError(err)
// invalid signature test
// 1. update test. ZSK and set expired signature
// 2. add new cow.test. zone => DS for cow.test. will be signed with new ZSK
// 3. build a trust chain for cow.test. => trigger cache outdated error and the chain update
// 4. chain update fails because of invalid signature
// rotate test. ZSK
testZSK, testZSKsk = getKey("test.", dns.ZONE)
tt, _ := time.Parse(time.RFC3339, "2020-01-02T00:00:00Z")
err = r.updateDNSKeyRecord("test.", testZSK, testZSKsk, tt)
a.NoError(err)
cowTestKSK, cowTestKSKsk := getKey("cow.test.", dns.ZONE|dns.SEP)
cowTestZSK, cowTestZSKsk := getKey("cow.test.", dns.ZONE)
// make cow.test. zone
err = r.updateDSRecord("cow.test.", &[]dns.DS{*cowTestKSK.ToDS(dns.SHA256)}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("cow.test.", cowTestKSK, cowTestKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("cow.test.", cowTestZSK, cowTestZSKsk, time.Time{})
a.NoError(err)
// this is cached and still valid
err = tch.ensure(context.Background(), "rand.test.", []uint16{randTestZSK.KeyTag()})
a.NoError(err)
// this was removed during last cache re-validation
// triggers the cache update and the chain is broken
err = tch.ensure(context.Background(), "algo.test.", []uint16{algoTestZSK.KeyTag()})
a.Error(err)
// this is a new, triggers the cache update and the chain is broken
err = tch.ensure(context.Background(), "cow.test.", []uint16{cowTestZSK.KeyTag()})
a.Error(err)
// DNSKEY expiration test
// DNSKEY is expired when its RRSIG expired
// 1. restore test. ZSK
// 2. manually expire test. RRSIG in the cache
// rotate test. ZSK
testZSK, testZSKsk = getKey("test.", dns.ZONE)
err = r.updateDNSKeyRecord("test.", testZSK, testZSKsk, time.Time{})
a.NoError(err)
err = tch.ensure(context.Background(), "cow.test.", []uint16{cowTestZSK.KeyTag()})
a.NoError(err)
// get a new signature
rrset, _, err := r.QueryRRSet(context.Background(), "test.", dns.TypeDNSKEY)
a.NoError(err)
// calc and update sig in the cache with expired one
tt, _ = time.Parse(time.RFC3339, "2020-01-02T00:00:00Z")
sig, err := r.sign(rrset, "test.", testKSK.KeyTag(), tt, testKSKsk)
tch.trustedZones["test."].rrSig[testKSK.KeyTag()] = sig
a.Equal(1, len(tch.trustedZones["test."].rrSig))
err = tch.ensure(context.Background(), "algo.test.", []uint16{algoTestZSK.KeyTag()})
a.NoError(err)
// ZSK on the last zone rotation for all zones in cache
// this simulates the scenario with example.com cached
// and www.example.com requested that is signed with newer ZSK
// 1. rotate algo.test. ZSK
// 2. ensure trust and ask for newer ZSK
// rotate algo.test. ZSK
algoTestZSK, algoTestZSKsk = getKey("algo.test.", dns.ZONE)
err = r.updateDNSKeyRecord("algo.test.", algoTestZSK, algoTestZSKsk, time.Time{})
a.NoError(err)
// request cached algo.test. with a new ZSK
err = tch.ensure(context.Background(), "algo.test.", []uint16{algoTestZSK.KeyTag()})
a.NoError(err)
// KSK rotation tests
// 1. rotate all KSK and one of ZSK
// 2. update cow.test. ZSK
// 3. request new cow.test. ZSK from the chain
rootKSK, rootKSKsk = getKey(".", dns.ZONE|dns.SEP)
rootAnchor = rootKSK.ToDS(dns.SHA256)
err = r.updateDSRecord(".", &[]dns.DS{*rootAnchor}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord(".", rootKSK, rootKSKsk, time.Time{})
a.NoError(err)
testKSK, testKSKsk = getKey("test.", dns.ZONE|dns.SEP)
err = r.updateDSRecord("test.", &[]dns.DS{*testKSK.ToDS(dns.SHA256)}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("test.", testKSK, testKSKsk, time.Time{})
a.NoError(err)
cowTestKSK, cowTestKSKsk = getKey("cow.test.", dns.ZONE|dns.SEP)
err = r.updateDSRecord("cow.test.", &[]dns.DS{*cowTestKSK.ToDS(dns.SHA256)}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("cow.test.", cowTestKSK, cowTestKSKsk, time.Time{})
a.NoError(err)
// rotate test. ZSK
testZSK, testZSKsk = getKey("test.", dns.ZONE)
err = r.updateDNSKeyRecord("test.", testZSK, testZSKsk, time.Time{})
a.NoError(err)
// rotate cow.test. ZSK
cowTestZSK, cowTestZSKsk = getKey("cow.test.", dns.ZONE)
err = r.updateDNSKeyRecord("cow.test.", cowTestZSK, cowTestZSKsk, time.Time{})
a.NoError(err)
err = tch.ensure(context.Background(), "cow.test.", []uint16{cowTestZSK.KeyTag()})
a.NoError(err)
// Trust chain failure test
// update KSK but do not update DS
// using a new trust chain (no cache) ensure it fails
// note: using an existing cached chain would not work because once an entry is cached
// it is considered valid if it has ZSK for signature verification
testKSK, testKSKsk = getKey("test.", dns.ZONE|dns.SEP)
err = r.updateKSKNoCheck("test.", testKSK, testKSKsk, time.Time{})
a.NoError(err)
newCh = makeTrustChain(r)
err = newCh.ensure(context.Background(), "algo.test.", []uint16{algoTestZSK.KeyTag()})
a.Error(err)
a.Contains(err.Error(), "failed to verify test. KSK against digest in parent DS")
}
func TestEnsureTrustChainFailures(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
var err error
r := makeEmptyTestResolver()
rootKSK, rootKSKsk := getKey(".", dns.ZONE|dns.SEP)
rootZSK, rootZSKsk := getKey(".", dns.ZONE)
rootAnchor := rootKSK.ToDS(dns.SHA256)
// make . zone
err = r.updateDSRecord(".", &[]dns.DS{*rootAnchor}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord(".", rootKSK, rootKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord(".", rootZSK, rootZSKsk, time.Time{})
a.NoError(err)
// test error on empty zone
newCh := makeTrustChain(r)
err = newCh.ensure(context.Background(), "", []uint16{})
a.Error(err)
// test non-existing ZSK
err = newCh.ensure(context.Background(), ".", []uint16{})
a.Error(err)
a.Contains(err.Error(), "ZSK [] not found in zone .")
testKSK, testKSKsk := getKey("test.", dns.ZONE|dns.SEP)
testZSK, testZSKsk := getKey("test.", dns.ZONE)
// make test. zone
err = r.updateDSRecord("test.", &[]dns.DS{*testKSK.ToDS(dns.SHA256)}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("test.", testKSK, testKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("test.", testZSK, testZSKsk, time.Time{})
a.NoError(err)
// update . ZSK so that test. DS will mismatch
rootZSK, rootZSKsk = getKey(".", dns.ZONE)
err = r.updateZSK(".", rootZSK, rootZSKsk, time.Time{})
a.NoError(err)
tch := makeTrustChain(r)
err = tch.ensure(context.Background(), "test.", []uint16{testZSK.KeyTag()})
a.Error(err)
a.Contains(err.Error(), "cache outdated for already updated zone .")
}
func TestAuthenticate(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
var err error
r := makeEmptyTestResolver()
rootKSK, rootKSKsk := getKey(".", dns.ZONE|dns.SEP)
rootZSK, rootZSKsk := getKey(".", dns.ZONE)
rootAnchor := rootKSK.ToDS(dns.SHA256)
// make . zone
err = r.updateDSRecord(".", &[]dns.DS{*rootAnchor}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord(".", rootKSK, rootKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord(".", rootZSK, rootZSKsk, time.Time{})
a.NoError(err)
// check signerName validation
rrset, rrsig, err := r.QueryRRSet(context.Background(), ".", dns.TypeDNSKEY)
a.NoError(err)
sig := rrsig[0]
sig.SignerName = "test"
rrsig = append(rrsig, sig)
tch := makeTrustChain(r)
err = tch.Authenticate(context.Background(), rrset, rrsig)
a.Error(err)
a.Contains(err.Error(), "signer name mismatch")
testKSK, testKSKsk := getKey("test.", dns.ZONE|dns.SEP)
testZSK, testZSKsk := getKey("test.", dns.ZONE)
// make test. zone
err = r.updateDSRecord("test.", &[]dns.DS{*testKSK.ToDS(dns.SHA256)}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("test.", testKSK, testKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord("test.", testZSK, testZSKsk, time.Time{})
a.NoError(err)
err = r.updateARecord("www.test.", net.IPv4(1, 2, 3, 4), time.Time{})
a.NoError(err)
rrset, rrsig, err = r.QueryRRSet(context.Background(), "www.test.", dns.TypeA)
err = tch.Authenticate(context.Background(), rrset, rrsig)
a.NoError(err)
// DNSKEY is signed with KSK so authenticate will fail looking up KSK in ZSK
rrset, rrsig, err = r.QueryRRSet(context.Background(), "test.", dns.TypeDNSKEY)
err = tch.Authenticate(context.Background(), rrset, rrsig)
a.Error(err)
err = tch.Authenticate(context.Background(), rrset, nil)
a.Error(err)
err = tch.Authenticate(context.Background(), rrset, []dns.RRSIG{})
a.Error(err)
}
func TestQueryWrapper(t *testing.T) {
partitiontest.PartitionTest(t)
a := require.New(t)
r := makeEmptyTestResolver()
qr := QueryWrapper{r}
dss, err := qr.GetRootAnchorDS()
a.NoError(err)
a.Equal(2, len(dss))
currentDS := dss[1]
a.Equal("E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D", currentDS.Digest)
a.Equal(uint16(20326), currentDS.KeyTag)
a.Equal(uint8(8), currentDS.Algorithm)
a.Equal(uint8(2), currentDS.DigestType)
// make . zone
rootKSK, rootKSKsk := getKey(".", dns.ZONE|dns.SEP)
rootZSK, rootZSKsk := getKey(".", dns.ZONE)
rootAnchor := rootKSK.ToDS(dns.SHA256)
err = r.updateDSRecord(".", &[]dns.DS{*rootAnchor}, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord(".", rootKSK, rootKSKsk, time.Time{})
a.NoError(err)
err = r.updateDNSKeyRecord(".", rootZSK, rootZSKsk, time.Time{})
a.NoError(err)
// check signerName validation
rrset, rrsig, err := qr.QueryRRSet(context.Background(), ".", dns.TypeDNSKEY)
a.NoError(err)
a.Equal(2, len(rrset))
a.Equal(1, len(rrsig))
}
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