mirror of
https://github.com/juanfont/headscale.git
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This PR addresses some consistency issues that was introduced or discovered with the nodestore. nodestore: Now returns the node that is being put or updated when it is finished. This closes a race condition where when we read it back, we do not necessarily get the node with the given change and it ensures we get all the other updates from that batch write. auth: Authentication paths have been unified and simplified. It removes a lot of bad branches and ensures we only do the minimal work. A comprehensive auth test set has been created so we do not have to run integration tests to validate auth and it has allowed us to generate test cases for all the branches we currently know of. integration: added a lot more tooling and checks to validate that nodes reach the expected state when they come up and down. Standardised between the different auth models. A lot of this is to support or detect issues in the changes to nodestore (races) and auth (inconsistencies after login and reaching correct state) This PR was assisted, particularly tests, by claude code.
461 lines
16 KiB
Go
461 lines
16 KiB
Go
package state
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import (
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"net/netip"
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"testing"
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"time"
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"github.com/juanfont/headscale/hscontrol/types"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"tailscale.com/types/ptr"
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)
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// TestEphemeralNodeDeleteWithConcurrentUpdate tests the race condition where UpdateNode and DeleteNode
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// are called concurrently and may be batched together. This reproduces the issue where ephemeral nodes
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// are not properly deleted during logout because UpdateNodeFromMapRequest returns a stale node view
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// after the node has been deleted from the NodeStore.
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func TestEphemeralNodeDeleteWithConcurrentUpdate(t *testing.T) {
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// Create a simple test node
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node := createTestNode(1, 1, "test-user", "test-node")
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// Create NodeStore
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store := NewNodeStore(nil, allowAllPeersFunc)
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store.Start()
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defer store.Stop()
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// Put the node in the store
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resultNode := store.PutNode(node)
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require.True(t, resultNode.Valid(), "initial PutNode should return valid node")
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// Verify node exists
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retrievedNode, found := store.GetNode(node.ID)
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require.True(t, found)
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require.Equal(t, node.ID, retrievedNode.ID())
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// Test scenario: UpdateNode is called, returns a node view from the batch,
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// but in the same batch a DeleteNode removes the node.
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// This simulates what happens when:
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// 1. UpdateNodeFromMapRequest calls UpdateNode and gets back updatedNode
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// 2. At the same time, handleLogout calls DeleteNode
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// 3. They get batched together: [UPDATE, DELETE]
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// 4. UPDATE modifies the node, DELETE removes it
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// 5. UpdateNode returns a node view based on the state AFTER both operations
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// 6. If DELETE came after UPDATE, the returned node should be invalid
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done := make(chan bool, 2)
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var updatedNode types.NodeView
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var updateOk bool
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// Goroutine 1: UpdateNode (simulates UpdateNodeFromMapRequest)
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go func() {
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updatedNode, updateOk = store.UpdateNode(node.ID, func(n *types.Node) {
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n.LastSeen = ptr.To(time.Now())
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})
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done <- true
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}()
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// Goroutine 2: DeleteNode (simulates handleLogout for ephemeral node)
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go func() {
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// Small delay to increase chance of batching together
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time.Sleep(1 * time.Millisecond)
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store.DeleteNode(node.ID)
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done <- true
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}()
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// Wait for both operations
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<-done
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<-done
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// Give batching time to complete
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time.Sleep(50 * time.Millisecond)
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// The key assertion: if UpdateNode and DeleteNode were batched together
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// with DELETE after UPDATE, then UpdateNode should return an invalid node
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// OR it should return a valid node but the node should no longer exist in the store
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_, found = store.GetNode(node.ID)
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assert.False(t, found, "node should be deleted from NodeStore")
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// If the update happened before delete in the batch, the returned node might be invalid
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if updateOk {
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t.Logf("UpdateNode returned ok=true, valid=%v", updatedNode.Valid())
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// This is the bug scenario - UpdateNode thinks it succeeded but node is gone
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if updatedNode.Valid() {
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t.Logf("WARNING: UpdateNode returned valid node but node was deleted - this indicates the race condition bug")
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}
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} else {
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t.Logf("UpdateNode correctly returned ok=false (node deleted in same batch)")
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}
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}
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// TestUpdateNodeReturnsInvalidWhenDeletedInSameBatch specifically tests that when
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// UpdateNode and DeleteNode are in the same batch with DELETE after UPDATE,
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// the UpdateNode should return an invalid node view.
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func TestUpdateNodeReturnsInvalidWhenDeletedInSameBatch(t *testing.T) {
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node := createTestNode(2, 1, "test-user", "test-node-2")
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store := NewNodeStore(nil, allowAllPeersFunc)
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store.Start()
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defer store.Stop()
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// Put node in store
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_ = store.PutNode(node)
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// Simulate the exact sequence: UpdateNode gets queued, then DeleteNode gets queued,
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// they batch together, and we check what UpdateNode returns
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resultChan := make(chan struct {
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node types.NodeView
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ok bool
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})
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// Start UpdateNode - it will block until batch is applied
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go func() {
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node, ok := store.UpdateNode(node.ID, func(n *types.Node) {
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n.LastSeen = ptr.To(time.Now())
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})
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resultChan <- struct {
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node types.NodeView
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ok bool
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}{node, ok}
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}()
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// Give UpdateNode a moment to queue its work
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time.Sleep(5 * time.Millisecond)
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// Now queue DeleteNode - should batch with the UPDATE
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store.DeleteNode(node.ID)
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// Get the result from UpdateNode
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result := <-resultChan
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// Wait for batch to complete
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time.Sleep(50 * time.Millisecond)
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// Node should be deleted
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_, found := store.GetNode(node.ID)
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assert.False(t, found, "node should be deleted")
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// The critical check: what did UpdateNode return?
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// After the commit c6b09289988f34398eb3157e31ba092eb8721a9f,
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// UpdateNode returns the node state from the batch.
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// If DELETE came after UPDATE in the batch, the node doesn't exist anymore,
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// so UpdateNode should return (invalid, false)
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t.Logf("UpdateNode returned: ok=%v, valid=%v", result.ok, result.node.Valid())
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// This is the expected behavior - if node was deleted in same batch,
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// UpdateNode should return invalid node
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if result.ok && result.node.Valid() {
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t.Error("BUG: UpdateNode returned valid node even though it was deleted in same batch")
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}
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}
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// TestPersistNodeToDBPreventsRaceCondition tests that persistNodeToDB correctly handles
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// the race condition where a node is deleted after UpdateNode returns but before
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// persistNodeToDB is called. This reproduces the ephemeral node deletion bug.
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func TestPersistNodeToDBPreventsRaceCondition(t *testing.T) {
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node := createTestNode(3, 1, "test-user", "test-node-3")
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store := NewNodeStore(nil, allowAllPeersFunc)
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store.Start()
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defer store.Stop()
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// Put node in store
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_ = store.PutNode(node)
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// Simulate UpdateNode being called
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updatedNode, ok := store.UpdateNode(node.ID, func(n *types.Node) {
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n.LastSeen = ptr.To(time.Now())
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})
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require.True(t, ok, "UpdateNode should succeed")
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require.True(t, updatedNode.Valid(), "UpdateNode should return valid node")
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// Now delete the node (simulating ephemeral logout happening concurrently)
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store.DeleteNode(node.ID)
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// Wait for deletion to complete
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time.Sleep(50 * time.Millisecond)
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// Verify node is deleted
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_, found := store.GetNode(node.ID)
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require.False(t, found, "node should be deleted")
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// Now try to use the updatedNode from before the deletion
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// In the old code, this would re-insert the node into the database
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// With our fix, GetNode check in persistNodeToDB should prevent this
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// Simulate what persistNodeToDB does - check if node still exists
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_, exists := store.GetNode(updatedNode.ID())
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if !exists {
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t.Log("SUCCESS: persistNodeToDB check would prevent re-insertion of deleted node")
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} else {
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t.Error("BUG: Node still exists in NodeStore after deletion")
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}
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// The key assertion: after deletion, attempting to persist the old updatedNode
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// should fail because the node no longer exists in NodeStore
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assert.False(t, exists, "persistNodeToDB should detect node was deleted and refuse to persist")
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}
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// TestEphemeralNodeLogoutRaceCondition tests the specific race condition that occurs
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// when an ephemeral node logs out. This reproduces the bug where:
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// 1. UpdateNodeFromMapRequest calls UpdateNode and receives a node view
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// 2. Concurrently, handleLogout is called for the ephemeral node and calls DeleteNode
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// 3. UpdateNode and DeleteNode get batched together
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// 4. If UpdateNode's result is used to call persistNodeToDB after the deletion,
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// the node could be re-inserted into the database even though it was deleted
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func TestEphemeralNodeLogoutRaceCondition(t *testing.T) {
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ephemeralNode := createTestNode(4, 1, "test-user", "ephemeral-node")
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ephemeralNode.AuthKey = &types.PreAuthKey{
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ID: 1,
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Key: "test-key",
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Ephemeral: true,
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}
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store := NewNodeStore(nil, allowAllPeersFunc)
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store.Start()
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defer store.Stop()
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// Put ephemeral node in store
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_ = store.PutNode(ephemeralNode)
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// Simulate concurrent operations:
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// 1. UpdateNode (from UpdateNodeFromMapRequest during polling)
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// 2. DeleteNode (from handleLogout when client sends logout request)
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var updatedNode types.NodeView
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var updateOk bool
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done := make(chan bool, 2)
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// Goroutine 1: UpdateNode (simulates UpdateNodeFromMapRequest)
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go func() {
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updatedNode, updateOk = store.UpdateNode(ephemeralNode.ID, func(n *types.Node) {
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n.LastSeen = ptr.To(time.Now())
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})
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done <- true
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}()
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// Goroutine 2: DeleteNode (simulates handleLogout for ephemeral node)
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go func() {
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time.Sleep(1 * time.Millisecond) // Slight delay to batch operations
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store.DeleteNode(ephemeralNode.ID)
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done <- true
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}()
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// Wait for both operations
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<-done
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<-done
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// Give batching time to complete
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time.Sleep(50 * time.Millisecond)
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// Node should be deleted from store
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_, found := store.GetNode(ephemeralNode.ID)
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assert.False(t, found, "ephemeral node should be deleted from NodeStore")
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// Critical assertion: if UpdateNode returned before DeleteNode completed,
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// the updatedNode might be valid but the node is actually deleted.
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// This is the bug - UpdateNodeFromMapRequest would get a valid node,
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// then try to persist it, re-inserting the deleted ephemeral node.
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if updateOk && updatedNode.Valid() {
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t.Log("UpdateNode returned valid node, but node is deleted - this is the race condition")
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// In the real code, this would cause persistNodeToDB to be called with updatedNode
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// The fix in persistNodeToDB checks if the node still exists:
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_, stillExists := store.GetNode(updatedNode.ID())
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assert.False(t, stillExists, "persistNodeToDB should check NodeStore and find node deleted")
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} else if !updateOk || !updatedNode.Valid() {
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t.Log("UpdateNode correctly returned invalid/not-ok result (delete happened in same batch)")
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}
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}
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// TestUpdateNodeFromMapRequestEphemeralLogoutSequence tests the exact sequence
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// that causes ephemeral node logout failures:
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// 1. Client sends MapRequest with updated endpoint info
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// 2. UpdateNodeFromMapRequest starts processing, calls UpdateNode
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// 3. Client sends logout request (past expiry)
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// 4. handleLogout calls DeleteNode for ephemeral node
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// 5. UpdateNode and DeleteNode batch together
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// 6. UpdateNode returns a valid node (from before delete in batch)
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// 7. persistNodeToDB is called with the stale valid node
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// 8. Node gets re-inserted into database instead of staying deleted
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func TestUpdateNodeFromMapRequestEphemeralLogoutSequence(t *testing.T) {
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ephemeralNode := createTestNode(5, 1, "test-user", "ephemeral-node-5")
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ephemeralNode.AuthKey = &types.PreAuthKey{
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ID: 2,
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Key: "test-key-2",
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Ephemeral: true,
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}
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store := NewNodeStore(nil, allowAllPeersFunc)
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store.Start()
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defer store.Stop()
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// Initial state: ephemeral node exists
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_ = store.PutNode(ephemeralNode)
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// Step 1: UpdateNodeFromMapRequest calls UpdateNode
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// (simulating client sending MapRequest with endpoint updates)
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updateStarted := make(chan bool)
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var updatedNode types.NodeView
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var updateOk bool
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go func() {
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updateStarted <- true
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updatedNode, updateOk = store.UpdateNode(ephemeralNode.ID, func(n *types.Node) {
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n.LastSeen = ptr.To(time.Now())
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endpoint := netip.MustParseAddrPort("10.0.0.1:41641")
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n.Endpoints = []netip.AddrPort{endpoint}
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})
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}()
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<-updateStarted
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// Small delay to ensure UpdateNode is queued
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time.Sleep(5 * time.Millisecond)
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// Step 2: Logout happens - handleLogout calls DeleteNode
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// (simulating client sending logout with past expiry)
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store.DeleteNode(ephemeralNode.ID)
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// Wait for batching to complete
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time.Sleep(50 * time.Millisecond)
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// Step 3: Check results
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_, nodeExists := store.GetNode(ephemeralNode.ID)
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assert.False(t, nodeExists, "ephemeral node must be deleted after logout")
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// Step 4: Simulate what happens if we try to persist the updatedNode
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if updateOk && updatedNode.Valid() {
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// This is the problematic path - UpdateNode returned a valid node
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// but the node was deleted in the same batch
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t.Log("UpdateNode returned valid node even though node was deleted")
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// The fix: persistNodeToDB must check NodeStore before persisting
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_, checkExists := store.GetNode(updatedNode.ID())
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if checkExists {
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t.Error("BUG: Node still exists in NodeStore after deletion - should be impossible")
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} else {
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t.Log("SUCCESS: persistNodeToDB would detect node is deleted and refuse to persist")
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}
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} else {
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t.Log("UpdateNode correctly indicated node was deleted (returned invalid or not-ok)")
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}
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// Final assertion: node must not exist
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_, finalExists := store.GetNode(ephemeralNode.ID)
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assert.False(t, finalExists, "ephemeral node must remain deleted")
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}
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// TestUpdateNodeDeletedInSameBatchReturnsInvalid specifically tests that when
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// UpdateNode and DeleteNode are batched together with DELETE after UPDATE,
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// UpdateNode returns ok=false to indicate the node was deleted.
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func TestUpdateNodeDeletedInSameBatchReturnsInvalid(t *testing.T) {
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node := createTestNode(6, 1, "test-user", "test-node-6")
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store := NewNodeStore(nil, allowAllPeersFunc)
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store.Start()
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defer store.Stop()
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// Put node in store
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_ = store.PutNode(node)
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// Queue UpdateNode
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updateDone := make(chan struct {
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node types.NodeView
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ok bool
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})
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go func() {
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updatedNode, ok := store.UpdateNode(node.ID, func(n *types.Node) {
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n.LastSeen = ptr.To(time.Now())
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})
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updateDone <- struct {
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node types.NodeView
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ok bool
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}{updatedNode, ok}
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}()
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// Small delay to ensure UpdateNode is queued
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time.Sleep(5 * time.Millisecond)
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// Queue DeleteNode - should batch with UpdateNode
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store.DeleteNode(node.ID)
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// Get UpdateNode result
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result := <-updateDone
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// Wait for batch to complete
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time.Sleep(50 * time.Millisecond)
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// Node should be deleted
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_, exists := store.GetNode(node.ID)
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assert.False(t, exists, "node should be deleted from store")
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// UpdateNode should indicate the node was deleted
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// After c6b09289988f34398eb3157e31ba092eb8721a9f, when UPDATE and DELETE
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// are in the same batch with DELETE after UPDATE, UpdateNode returns
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// the state after the batch is applied - which means the node doesn't exist
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assert.False(t, result.ok, "UpdateNode should return ok=false when node deleted in same batch")
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assert.False(t, result.node.Valid(), "UpdateNode should return invalid node when node deleted in same batch")
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}
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// TestPersistNodeToDBChecksNodeStoreBeforePersist verifies that persistNodeToDB
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// checks if the node still exists in NodeStore before persisting to database.
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// This prevents the race condition where:
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// 1. UpdateNodeFromMapRequest calls UpdateNode and gets a valid node
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// 2. Ephemeral node logout calls DeleteNode
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// 3. UpdateNode and DeleteNode batch together
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// 4. UpdateNode returns a valid node (from before delete in batch)
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// 5. UpdateNodeFromMapRequest calls persistNodeToDB with the stale node
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// 6. persistNodeToDB must detect the node is deleted and refuse to persist
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func TestPersistNodeToDBChecksNodeStoreBeforePersist(t *testing.T) {
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ephemeralNode := createTestNode(7, 1, "test-user", "ephemeral-node-7")
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ephemeralNode.AuthKey = &types.PreAuthKey{
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ID: 3,
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Key: "test-key-3",
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Ephemeral: true,
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}
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store := NewNodeStore(nil, allowAllPeersFunc)
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store.Start()
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defer store.Stop()
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// Put node in store
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_ = store.PutNode(ephemeralNode)
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// Simulate the race:
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// 1. UpdateNode is called (from UpdateNodeFromMapRequest)
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updatedNode, ok := store.UpdateNode(ephemeralNode.ID, func(n *types.Node) {
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n.LastSeen = ptr.To(time.Now())
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})
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require.True(t, ok, "UpdateNode should succeed")
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require.True(t, updatedNode.Valid(), "UpdateNode should return valid node")
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// 2. Node is deleted (from handleLogout for ephemeral node)
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store.DeleteNode(ephemeralNode.ID)
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// Wait for deletion
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time.Sleep(50 * time.Millisecond)
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// 3. Verify node is deleted from store
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_, exists := store.GetNode(ephemeralNode.ID)
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require.False(t, exists, "node should be deleted from NodeStore")
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// 4. Simulate what persistNodeToDB does - check if node still exists
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// The fix in persistNodeToDB checks NodeStore before persisting:
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// if !exists { return error }
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// This prevents re-inserting the deleted node into the database
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// Verify the node from UpdateNode is valid but node is gone from store
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assert.True(t, updatedNode.Valid(), "UpdateNode returned a valid node view")
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_, stillExists := store.GetNode(updatedNode.ID())
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assert.False(t, stillExists, "but node should be deleted from NodeStore")
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// This is the critical test: persistNodeToDB must check NodeStore
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// and refuse to persist if the node doesn't exist anymore
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// The actual persistNodeToDB implementation does:
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// _, exists := s.nodeStore.GetNode(node.ID())
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// if !exists { return error }
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}
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