move logic for validating node names (#2127)
* move logic for validating node names this commits moves the generation of "given names" of nodes into the registration function, and adds validation of renames to RenameNode using the same logic. Fixes #2121 Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com> * fix double arg Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com> --------- Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
This commit is contained in:
Kristoffer Dalby
GitHub
parent
64319f79ff
commit
064c46f2a5
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@ -66,7 +66,7 @@ func (h *Headscale) handleRegister(
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regReq tailcfg.RegisterRequest,
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machineKey key.MachinePublic,
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) {
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logInfo, logTrace, logErr := logAuthFunc(regReq, machineKey)
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logInfo, logTrace, _ := logAuthFunc(regReq, machineKey)
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now := time.Now().UTC()
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logTrace("handleRegister called, looking up machine in DB")
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node, err := h.db.GetNodeByAnyKey(machineKey, regReq.NodeKey, regReq.OldNodeKey)
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@ -105,16 +105,6 @@ func (h *Headscale) handleRegister(
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logInfo("Node not found in database, creating new")
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givenName, err := h.db.GenerateGivenName(
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machineKey,
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regReq.Hostinfo.Hostname,
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)
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if err != nil {
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logErr(err, "Failed to generate given name for node")
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return
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}
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// The node did not have a key to authenticate, which means
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// that we rely on a method that calls back some how (OpenID or CLI)
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// We create the node and then keep it around until a callback
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@ -122,7 +112,6 @@ func (h *Headscale) handleRegister(
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newNode := types.Node{
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MachineKey: machineKey,
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Hostname: regReq.Hostinfo.Hostname,
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GivenName: givenName,
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NodeKey: regReq.NodeKey,
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LastSeen: &now,
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Expiry: &time.Time{},
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@ -354,21 +343,8 @@ func (h *Headscale) handleAuthKey(
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} else {
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now := time.Now().UTC()
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givenName, err := h.db.GenerateGivenName(machineKey, registerRequest.Hostinfo.Hostname)
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if err != nil {
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log.Error().
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Caller().
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Str("func", "RegistrationHandler").
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Str("hostinfo.name", registerRequest.Hostinfo.Hostname).
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Err(err).
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Msg("Failed to generate given name for node")
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return
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}
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nodeToRegister := types.Node{
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Hostname: registerRequest.Hostinfo.Hostname,
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GivenName: givenName,
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UserID: pak.User.ID,
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User: pak.User,
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MachineKey: machineKey,
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@ -90,20 +90,6 @@ func (hsdb *HSDatabase) ListEphemeralNodes() (types.Nodes, error) {
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})
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}
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func listNodesByGivenName(tx *gorm.DB, givenName string) (types.Nodes, error) {
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nodes := types.Nodes{}
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if err := tx.
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Preload("AuthKey").
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Preload("AuthKey.User").
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Preload("User").
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Preload("Routes").
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Where("given_name = ?", givenName).Find(&nodes).Error; err != nil {
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return nil, err
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}
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return nodes, nil
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}
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func (hsdb *HSDatabase) getNode(user string, name string) (*types.Node, error) {
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return Read(hsdb.DB, func(rx *gorm.DB) (*types.Node, error) {
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return getNode(rx, user, name)
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@ -242,9 +228,9 @@ func SetTags(
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}
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// RenameNode takes a Node struct and a new GivenName for the nodes
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// and renames it.
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// and renames it. If the name is not unique, it will return an error.
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func RenameNode(tx *gorm.DB,
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nodeID uint64, newName string,
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nodeID types.NodeID, newName string,
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) error {
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err := util.CheckForFQDNRules(
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newName,
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@ -253,6 +239,15 @@ func RenameNode(tx *gorm.DB,
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return fmt.Errorf("renaming node: %w", err)
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}
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uniq, err := isUnqiueName(tx, newName)
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if err != nil {
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return fmt.Errorf("checking if name is unique: %w", err)
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}
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if !uniq {
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return fmt.Errorf("name is not unique: %s", newName)
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}
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if err := tx.Model(&types.Node{}).Where("id = ?", nodeID).Update("given_name", newName).Error; err != nil {
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return fmt.Errorf("failed to rename node in the database: %w", err)
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}
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@ -415,6 +410,15 @@ func RegisterNode(tx *gorm.DB, node types.Node, ipv4 *netip.Addr, ipv6 *netip.Ad
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node.IPv4 = ipv4
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node.IPv6 = ipv6
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if node.GivenName == "" {
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givenName, err := ensureUniqueGivenName(tx, node.Hostname)
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if err != nil {
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return nil, fmt.Errorf("failed to ensure unique given name: %w", err)
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}
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node.GivenName = givenName
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}
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if err := tx.Save(&node).Error; err != nil {
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return nil, fmt.Errorf("failed register(save) node in the database: %w", err)
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}
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@ -642,40 +646,32 @@ func generateGivenName(suppliedName string, randomSuffix bool) (string, error) {
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return normalizedHostname, nil
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}
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func (hsdb *HSDatabase) GenerateGivenName(
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mkey key.MachinePublic,
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suppliedName string,
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) (string, error) {
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return Read(hsdb.DB, func(rx *gorm.DB) (string, error) {
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return GenerateGivenName(rx, mkey, suppliedName)
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})
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func isUnqiueName(tx *gorm.DB, name string) (bool, error) {
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nodes := types.Nodes{}
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if err := tx.
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Where("given_name = ?", name).Find(&nodes).Error; err != nil {
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return false, err
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}
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return len(nodes) == 0, nil
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}
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func GenerateGivenName(
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func ensureUniqueGivenName(
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tx *gorm.DB,
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mkey key.MachinePublic,
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suppliedName string,
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name string,
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) (string, error) {
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givenName, err := generateGivenName(suppliedName, false)
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givenName, err := generateGivenName(name, false)
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if err != nil {
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return "", err
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}
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// Tailscale rules (may differ) https://tailscale.com/kb/1098/machine-names/
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nodes, err := listNodesByGivenName(tx, givenName)
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unique, err := isUnqiueName(tx, givenName)
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if err != nil {
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return "", err
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}
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var nodeFound *types.Node
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for idx, node := range nodes {
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if node.GivenName == givenName {
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nodeFound = nodes[idx]
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}
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}
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if nodeFound != nil && nodeFound.MachineKey.String() != mkey.String() {
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postfixedName, err := generateGivenName(suppliedName, true)
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if !unique {
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postfixedName, err := generateGivenName(name, true)
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if err != nil {
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return "", err
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}
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@ -19,6 +19,7 @@ import (
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"github.com/puzpuzpuz/xsync/v3"
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"github.com/stretchr/testify/assert"
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"gopkg.in/check.v1"
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"gorm.io/gorm"
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"tailscale.com/tailcfg"
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"tailscale.com/types/key"
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"tailscale.com/types/ptr"
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@ -313,51 +314,6 @@ func (s *Suite) TestExpireNode(c *check.C) {
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c.Assert(nodeFromDB.IsExpired(), check.Equals, true)
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}
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func (s *Suite) TestGenerateGivenName(c *check.C) {
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user1, err := db.CreateUser("user-1")
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c.Assert(err, check.IsNil)
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pak, err := db.CreatePreAuthKey(user1.Name, false, false, nil, nil)
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c.Assert(err, check.IsNil)
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_, err = db.getNode("user-1", "testnode")
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c.Assert(err, check.NotNil)
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nodeKey := key.NewNode()
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machineKey := key.NewMachine()
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machineKey2 := key.NewMachine()
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node := &types.Node{
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ID: 0,
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MachineKey: machineKey.Public(),
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NodeKey: nodeKey.Public(),
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Hostname: "hostname-1",
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GivenName: "hostname-1",
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UserID: user1.ID,
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RegisterMethod: util.RegisterMethodAuthKey,
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AuthKeyID: ptr.To(pak.ID),
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}
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trx := db.DB.Save(node)
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c.Assert(trx.Error, check.IsNil)
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givenName, err := db.GenerateGivenName(machineKey2.Public(), "hostname-2")
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comment := check.Commentf("Same user, unique nodes, unique hostnames, no conflict")
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c.Assert(err, check.IsNil, comment)
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c.Assert(givenName, check.Equals, "hostname-2", comment)
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givenName, err = db.GenerateGivenName(machineKey.Public(), "hostname-1")
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comment = check.Commentf("Same user, same node, same hostname, no conflict")
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c.Assert(err, check.IsNil, comment)
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c.Assert(givenName, check.Equals, "hostname-1", comment)
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givenName, err = db.GenerateGivenName(machineKey2.Public(), "hostname-1")
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comment = check.Commentf("Same user, unique nodes, same hostname, conflict")
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c.Assert(err, check.IsNil, comment)
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c.Assert(givenName, check.Matches, fmt.Sprintf("^hostname-1-[a-z0-9]{%d}$", NodeGivenNameHashLength), comment)
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}
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func (s *Suite) TestSetTags(c *check.C) {
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user, err := db.CreateUser("test")
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c.Assert(err, check.IsNil)
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@ -778,3 +734,100 @@ func TestListEphemeralNodes(t *testing.T) {
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assert.Equal(t, nodeEph.UserID, ephemeralNodes[0].UserID)
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assert.Equal(t, nodeEph.Hostname, ephemeralNodes[0].Hostname)
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}
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func TestRenameNode(t *testing.T) {
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db, err := newTestDB()
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if err != nil {
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t.Fatalf("creating db: %s", err)
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}
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user, err := db.CreateUser("test")
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assert.NoError(t, err)
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user2, err := db.CreateUser("test2")
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assert.NoError(t, err)
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node := types.Node{
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ID: 0,
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MachineKey: key.NewMachine().Public(),
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NodeKey: key.NewNode().Public(),
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Hostname: "test",
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UserID: user.ID,
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RegisterMethod: util.RegisterMethodAuthKey,
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}
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node2 := types.Node{
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ID: 0,
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MachineKey: key.NewMachine().Public(),
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NodeKey: key.NewNode().Public(),
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Hostname: "test",
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UserID: user2.ID,
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RegisterMethod: util.RegisterMethodAuthKey,
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}
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err = db.DB.Save(&node).Error
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assert.NoError(t, err)
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err = db.DB.Save(&node2).Error
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assert.NoError(t, err)
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err = db.DB.Transaction(func(tx *gorm.DB) error {
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_, err := RegisterNode(tx, node, nil, nil)
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if err != nil {
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return err
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}
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_, err = RegisterNode(tx, node2, nil, nil)
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return err
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})
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assert.NoError(t, err)
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nodes, err := db.ListNodes()
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assert.NoError(t, err)
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assert.Len(t, nodes, 2)
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t.Logf("node1 %s %s", nodes[0].Hostname, nodes[0].GivenName)
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t.Logf("node2 %s %s", nodes[1].Hostname, nodes[1].GivenName)
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assert.Equal(t, nodes[0].Hostname, nodes[0].GivenName)
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assert.NotEqual(t, nodes[1].Hostname, nodes[1].GivenName)
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assert.Equal(t, nodes[0].Hostname, nodes[1].Hostname)
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assert.NotEqual(t, nodes[0].Hostname, nodes[1].GivenName)
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assert.Contains(t, nodes[1].GivenName, nodes[0].Hostname)
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assert.Equal(t, nodes[0].GivenName, nodes[1].Hostname)
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assert.Len(t, nodes[0].Hostname, 4)
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assert.Len(t, nodes[1].Hostname, 4)
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assert.Len(t, nodes[0].GivenName, 4)
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assert.Len(t, nodes[1].GivenName, 13)
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// Nodes can be renamed to a unique name
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err = db.Write(func(tx *gorm.DB) error {
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return RenameNode(tx, nodes[0].ID, "newname")
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})
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assert.NoError(t, err)
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nodes, err = db.ListNodes()
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assert.NoError(t, err)
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assert.Len(t, nodes, 2)
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assert.Equal(t, nodes[0].Hostname, "test")
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assert.Equal(t, nodes[0].GivenName, "newname")
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// Nodes can reuse name that is no longer used
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err = db.Write(func(tx *gorm.DB) error {
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return RenameNode(tx, nodes[1].ID, "test")
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})
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assert.NoError(t, err)
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nodes, err = db.ListNodes()
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assert.NoError(t, err)
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assert.Len(t, nodes, 2)
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assert.Equal(t, nodes[0].Hostname, "test")
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assert.Equal(t, nodes[0].GivenName, "newname")
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assert.Equal(t, nodes[1].GivenName, "test")
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// Nodes cannot be renamed to used names
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err = db.Write(func(tx *gorm.DB) error {
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return RenameNode(tx, nodes[0].ID, "test")
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})
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assert.ErrorContains(t, err, "name is not unique")
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}
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@ -373,7 +373,7 @@ func (api headscaleV1APIServer) RenameNode(
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node, err := db.Write(api.h.db.DB, func(tx *gorm.DB) (*types.Node, error) {
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err := db.RenameNode(
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tx,
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request.GetNodeId(),
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types.NodeID(request.GetNodeId()),
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request.GetNewName(),
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)
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if err != nil {
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@ -802,18 +802,12 @@ func (api headscaleV1APIServer) DebugCreateNode(
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return nil, err
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}
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givenName, err := api.h.db.GenerateGivenName(mkey, request.GetName())
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if err != nil {
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return nil, err
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}
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nodeKey := key.NewNode()
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newNode := types.Node{
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MachineKey: mkey,
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NodeKey: nodeKey.Public(),
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Hostname: request.GetName(),
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GivenName: givenName,
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User: *user,
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Expiry: &time.Time{},
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