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ipn/ipnlocal: allow multiple signature chains from the same SigCredential

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Detection of duplicate Network Lock signature chains added in
01847e0123 failed to account for chains
originating with a SigCredential signature, which is used for wrapped
auth keys. This results in erroneous removal of signatures that
originate from the same re-usable auth key.

This change ensures that multiple nodes created by the same re-usable
auth key are not getting filtered out by the network lock.

Updates tailscale/corp#19764

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
adrian/fix-vet-failures
Anton Tolchanov 4 months ago committed by Anton Tolchanov
parent 4651827f20
commit 781f79408d
4 changed files with 69 additions and 30 deletions
Show Stats Download Patch File Download Diff File

14
ipn/ipnlocal/network-lock.go
Unescape Escape View File

@ -142,8 +142,9 @@ func (b *LocalBackend) tkaFilterNetmapLocked(nm *netmap.NetworkMap) {
// - for each SigRotation signature, all previous node keys referenced by the
// nested signatures are marked as obsolete.
// - if there are multiple SigRotation signatures tracing back to the same
// wrapping pubkey (e.g. if a node is cloned with all its keys), we keep
// just one of them, marking the others as obsolete.
// wrapping pubkey of the initial SigDirect signature (e.g. if a node is
// cloned with all its keys), we keep just one of them, marking the others as
// obsolete.
type rotationTracker struct {
// obsolete is the set of node keys that are obsolete due to key rotation.
// users of rotationTracker should use the obsoleteKeys method for complete results.
@ -165,6 +166,13 @@ type sigRotationDetails struct {
func (r *rotationTracker) addRotationDetails(np key.NodePublic, d *tka.RotationDetails) {
r.obsolete.Make()
r.obsolete.AddSlice(d.PrevNodeKeys)
if d.InitialSig.SigKind != tka.SigDirect {
// Only enforce uniqueness of chains originating from a SigDirect
// signature. Chains that begin with a SigCredential can legitimately
// start from the same wrapping pubkey when multiple nodes join the
// network using the same reusable auth key.
return
}
rd := sigRotationDetails{
np: np,
numPrevKeys: len(d.PrevNodeKeys),
@ -172,7 +180,7 @@ func (r *rotationTracker) addRotationDetails(np key.NodePublic, d *tka.RotationD
if r.byWrappingKey == nil {
r.byWrappingKey = make(map[string][]sigRotationDetails)
}
wp := string(d.WrappingPubkey)
wp := string(d.InitialSig.WrappingPubkey)
r.byWrappingKey[wp] = append(r.byWrappingKey[wp], rd)
}

50
ipn/ipnlocal/network-lock_test.go
Unescape Escape View File

@ -609,7 +609,9 @@ func TestTKAFilterNetmap(t *testing.T) {
t.Fatal(err)
}
n6, n6Sig := nodeFromAuthKey(preauth)
// Two nodes created using the same auth key, both should be valid.
n60, n60Sig := nodeFromAuthKey(preauth)
n61, n61Sig := nodeFromAuthKey(preauth)
nm := &netmap.NetworkMap{
Peers: nodeViews([]*tailcfg.Node{
@ -619,7 +621,8 @@ func TestTKAFilterNetmap(t *testing.T) {
{ID: 4, Key: n4.Public(), KeySignature: n4Sig.Serialize()}, // messed-up signature
{ID: 50, Key: n5.Public(), KeySignature: n5InitialSig.Serialize()}, // rotated
{ID: 51, Key: n5Rotated.Public(), KeySignature: n5RotatedSig},
{ID: 6, Key: n6.Public(), KeySignature: n6Sig},
{ID: 60, Key: n60.Public(), KeySignature: n60Sig},
{ID: 61, Key: n61.Public(), KeySignature: n61Sig},
}),
}
@ -628,7 +631,8 @@ func TestTKAFilterNetmap(t *testing.T) {
want := nodeViews([]*tailcfg.Node{
{ID: 1, Key: n1.Public(), KeySignature: n1GoodSig.Serialize()},
{ID: 51, Key: n5Rotated.Public(), KeySignature: n5RotatedSig},
{ID: 6, Key: n6.Public(), KeySignature: n6Sig},
{ID: 60, Key: n60.Public(), KeySignature: n60Sig},
{ID: 61, Key: n61.Public(), KeySignature: n61Sig},
})
nodePubComparer := cmp.Comparer(func(x, y key.NodePublic) bool {
return x.Raw32() == y.Raw32()
@ -1206,6 +1210,14 @@ func TestRotationTracker(t *testing.T) {
raw32 := [32]byte{idx}
return key.NodePublicFromRaw32(go4mem.B(raw32[:]))
}
rd := func(initialKind tka.SigKind, wrappingKey []byte, prevKeys ...key.NodePublic) *tka.RotationDetails {
return &tka.RotationDetails{
InitialSig: &tka.NodeKeySignature{SigKind: initialKind, WrappingPubkey: wrappingKey},
PrevNodeKeys: prevKeys,
}
}
n1, n2, n3, n4, n5 := newNK(1), newNK(2), newNK(3), newNK(4), newNK(5)
pk1, pk2, pk3 := []byte{1}, []byte{2}, []byte{3}
@ -1225,46 +1237,46 @@ func TestRotationTracker(t *testing.T) {
{
name: "single_prev_key",
addDetails: []addDetails{
{np: n1, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n2}, WrappingPubkey: pk1}},
{np: n1, details: rd(tka.SigDirect, pk1, n2)},
},
want: set.SetOf([]key.NodePublic{n2}),
},
{
name: "several_prev_keys",
addDetails: []addDetails{
{np: n1, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n2}, WrappingPubkey: pk1}},
{np: n3, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n4}, WrappingPubkey: pk2}},
{np: n2, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n3, n4}, WrappingPubkey: pk1}},
{np: n1, details: rd(tka.SigDirect, pk1, n2)},
{np: n3, details: rd(tka.SigDirect, pk2, n4)},
{np: n2, details: rd(tka.SigDirect, pk1, n3, n4)},
},
want: set.SetOf([]key.NodePublic{n2, n3, n4}),
},
{
name: "several_per_pubkey_latest_wins",
addDetails: []addDetails{
{np: n2, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1}, WrappingPubkey: pk3}},
{np: n3, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1, n2}, WrappingPubkey: pk3}},
{np: n4, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1, n2, n3}, WrappingPubkey: pk3}},
{np: n5, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n4}, WrappingPubkey: pk3}},
{np: n2, details: rd(tka.SigDirect, pk3, n1)},
{np: n3, details: rd(tka.SigDirect, pk3, n1, n2)},
{np: n4, details: rd(tka.SigDirect, pk3, n1, n2, n3)},
{np: n5, details: rd(tka.SigDirect, pk3, n4)},
},
want: set.SetOf([]key.NodePublic{n1, n2, n3, n4}),
},
{
name: "several_per_pubkey_same_chain_length_all_rejected",
addDetails: []addDetails{
{np: n2, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1}, WrappingPubkey: pk3}},
{np: n3, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1, n2}, WrappingPubkey: pk3}},
{np: n4, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1, n2}, WrappingPubkey: pk3}},
{np: n5, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1, n2}, WrappingPubkey: pk3}},
{np: n2, details: rd(tka.SigDirect, pk3, n1)},
{np: n3, details: rd(tka.SigDirect, pk3, n1, n2)},
{np: n4, details: rd(tka.SigDirect, pk3, n1, n2)},
{np: n5, details: rd(tka.SigDirect, pk3, n1, n2)},
},
want: set.SetOf([]key.NodePublic{n1, n2, n3, n4, n5}),
},
{
name: "several_per_pubkey_longest_wins",
addDetails: []addDetails{
{np: n2, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1}, WrappingPubkey: pk3}},
{np: n3, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1, n2}, WrappingPubkey: pk3}},
{np: n4, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1, n2}, WrappingPubkey: pk3}},
{np: n5, details: &tka.RotationDetails{PrevNodeKeys: []key.NodePublic{n1, n2, n3}, WrappingPubkey: pk3}},
{np: n2, details: rd(tka.SigDirect, pk3, n1)},
{np: n3, details: rd(tka.SigDirect, pk3, n1, n2)},
{np: n4, details: rd(tka.SigDirect, pk3, n1, n2)},
{np: n5, details: rd(tka.SigDirect, pk3, n1, n2, n3)},
},
want: set.SetOf([]key.NodePublic{n1, n2, n3, n4}),
},

6
tka/sig.go
Unescape Escape View File

@ -313,9 +313,9 @@ type RotationDetails struct {
// PrevNodeKeys is a list of node keys which have been rotated out.
PrevNodeKeys []key.NodePublic
// WrappingPubkey is the public key which has been authorized to sign
// InitialSig is the first signature in the chain which led to
// this rotating signature.
WrappingPubkey []byte
InitialSig *NodeKeySignature
}
// rotationDetails returns the RotationDetails for a SigRotation signature.
@ -339,7 +339,7 @@ func (s *NodeKeySignature) rotationDetails() (*RotationDetails, error) {
}
nested = nested.Nested
}
sri.WrappingPubkey = nested.WrappingPubkey
sri.InitialSig = nested
return sri, nil
}

19
tka/sig_test.go
Unescape Escape View File

@ -356,9 +356,13 @@ func TestNodeKeySignatureRotationDetails(t *testing.T) {
return sig
},
want: &RotationDetails{
InitialSig: &NodeKeySignature{
SigKind: SigCredential,
KeyID: pub,
WrappingPubkey: cPub,
},
},
},
{
name: "SigRotation",
nodeKey: n2.Public(),
@ -382,7 +386,12 @@ func TestNodeKeySignatureRotationDetails(t *testing.T) {
return sig
},
want: &RotationDetails{
InitialSig: &NodeKeySignature{
SigKind: SigDirect,
Pubkey: n1pub,
KeyID: pub,
WrappingPubkey: cPub,
},
PrevNodeKeys: []key.NodePublic{n1.Public()},
},
},
@ -418,13 +427,23 @@ func TestNodeKeySignatureRotationDetails(t *testing.T) {
return sig
},
want: &RotationDetails{
InitialSig: &NodeKeySignature{
SigKind: SigDirect,
Pubkey: n1pub,
KeyID: pub,
WrappingPubkey: cPub,
},
PrevNodeKeys: []key.NodePublic{n2.Public(), n1.Public()},
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if tt.want != nil {
initialHash := tt.want.InitialSig.SigHash()
tt.want.InitialSig.Signature = ed25519.Sign(priv, initialHash[:])
}
sig := tt.sigFn()
if err := sig.verifySignature(tt.nodeKey, k); err != nil {
t.Fatalf("verifySignature(node) failed: %v", err)

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