consul: Create anonymous and master tokens

consul/acl.go

@@ -12,6 +12,10 @@ import (
 const (
 	// aclNotFound indicates there is no matching ACL
 	aclNotFound = "ACL not found"
+
+	// anonymousToken is the token ID we re-write to if there
+	// is no token ID provided
+	anonymousToken = "anonymous"
 )
 
 // aclCacheEntry is used to cache non-authoritative ACL's
@@ -39,10 +43,15 @@ func (s *Server) aclFault(id string) (string, error) {
 func (s *Server) resolveToken(id string) (acl.ACL, error) {
 	// Check if there is no ACL datacenter (ACL's disabled)
 	authDC := s.config.ACLDatacenter
-	if authDC == "" {
+	if len(authDC) == 0 {
 		return nil, nil
 	}
 
+	// Handle the anonymous token
+	if len(id) == 0 {
+		id = anonymousToken
+	}
+
 	// Check if we are the ACL datacenter and the leader, use the
 	// authoritative cache
 	if s.config.Datacenter == authDC && s.IsLeader() {

consul/acl_test.go

@@ -93,6 +93,59 @@ func TestACL_Authority_Found(t *testing.T) {
 	}
 }
 
+func TestACL_Authority_Anonymous_Found(t *testing.T) {
+	dir1, s1 := testServerWithConfig(t, func(c *Config) {
+		c.ACLDatacenter = "dc1" // Enable ACLs!
+	})
+	defer os.RemoveAll(dir1)
+	defer s1.Shutdown()
+	client := rpcClient(t, s1)
+	defer client.Close()
+
+	testutil.WaitForLeader(t, client.Call, "dc1")
+
+	// Resolve the token
+	acl, err := s1.resolveToken("")
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if acl == nil {
+		t.Fatalf("missing acl")
+	}
+
+	// Check the policy, should allow all
+	if !acl.KeyRead("foo/test") {
+		t.Fatalf("unexpected failed read")
+	}
+}
+
+func TestACL_Authority_Master_Found(t *testing.T) {
+	dir1, s1 := testServerWithConfig(t, func(c *Config) {
+		c.ACLDatacenter = "dc1" // Enable ACLs!
+		c.ACLMasterToken = "foobar"
+	})
+	defer os.RemoveAll(dir1)
+	defer s1.Shutdown()
+	client := rpcClient(t, s1)
+	defer client.Close()
+
+	testutil.WaitForLeader(t, client.Call, "dc1")
+
+	// Resolve the token
+	acl, err := s1.resolveToken("foobar")
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if acl == nil {
+		t.Fatalf("missing acl")
+	}
+
+	// Check the policy, should allow all
+	if !acl.KeyRead("foo/test") {
+		t.Fatalf("unexpected failed read")
+	}
+}
+
 func TestACL_NonAuthority_NotFound(t *testing.T) {
 	dir1, s1 := testServerWithConfig(t, func(c *Config) {
 		c.ACLDatacenter = "dc1"

consul/fsm.go

@@ -205,7 +205,13 @@ func (c *consulFSM) applyACLOperation(buf []byte, index uint64) interface{} {
 	}
 	switch req.Op {
 	case structs.ACLSet:
-		if err := c.state.ACLSet(index, &req.ACL); err != nil {
+		if err := c.state.ACLSet(index, &req.ACL, false); err != nil {
+			return err
+		} else {
+			return req.ACL.ID
+		}
+	case structs.ACLForceSet:
+		if err := c.state.ACLSet(index, &req.ACL, true); err != nil {
 			return err
 		} else {
 			return req.ACL.ID

consul/fsm_test.go

@@ -329,7 +329,7 @@ func TestFSM_SnapshotRestore(t *testing.T) {
 	session := &structs.Session{Node: "foo"}
 	fsm.state.SessionCreate(9, session)
 	acl := &structs.ACL{Name: "User Token"}
-	fsm.state.ACLSet(10, acl)
+	fsm.state.ACLSet(10, acl, false)
 
 	// Snapshot
 	snap, err := fsm.Snapshot()

consul/leader.go

@@ -1,6 +1,7 @@
 package consul
 
 import (
+	"fmt"
 	"net"
 	"strconv"
 	"time"
@@ -54,6 +55,11 @@ func (s *Server) leaderLoop(stopCh chan struct{}) {
 		s.logger.Printf("[WARN] consul: failed to broadcast new leader event: %v", err)
 	}
 
+	// Setup ACLs if we are the leader and need to
+	if err := s.initializeACL(); err != nil {
+		s.logger.Printf("[ERR] consul: ACL initialization failed: %v", err)
+	}
+
 	// Reconcile channel is only used once initial reconcile
 	// has succeeded
 	var reconcileCh chan serf.Member
@@ -99,6 +105,73 @@ WAIT:
 	}
 }
 
+// initializeACL is used to setup the ACLs if we are the leader
+// and need to do this.
+func (s *Server) initializeACL() error {
+	// Bail if not configured or we are not authoritative
+	authDC := s.config.ACLDatacenter
+	if len(authDC) == 0 || authDC != s.config.Datacenter {
+		return nil
+	}
+
+	// Purge the cache, since it could've changed while we
+	// were not the leader
+	s.aclAuthCache.Purge()
+
+	// Look for the anonymous token
+	state := s.fsm.State()
+	_, acl, err := state.ACLGet(anonymousToken)
+	if err != nil {
+		return fmt.Errorf("failed to get anonymous token: %v", err)
+	}
+
+	// Create anonymous token if missing
+	if acl == nil {
+		req := structs.ACLRequest{
+			Datacenter: authDC,
+			Op:         structs.ACLForceSet,
+			ACL: structs.ACL{
+				ID:   anonymousToken,
+				Name: "Anonymous Token",
+				Type: structs.ACLTypeClient,
+			},
+		}
+		_, err := s.raftApply(structs.ACLRequestType, &req)
+		if err != nil {
+			return fmt.Errorf("failed to create anonymous token: %v", err)
+		}
+	}
+
+	// Check for configured master token
+	master := s.config.ACLMasterToken
+	if len(master) == 0 {
+		return nil
+	}
+
+	// Look for the master token
+	_, acl, err = state.ACLGet(master)
+	if err != nil {
+		return fmt.Errorf("failed to get master token: %v", err)
+	}
+	if acl == nil {
+		req := structs.ACLRequest{
+			Datacenter: authDC,
+			Op:         structs.ACLForceSet,
+			ACL: structs.ACL{
+				ID:   master,
+				Name: "Master Token",
+				Type: structs.ACLTypeManagement,
+			},
+		}
+		_, err := s.raftApply(structs.ACLRequestType, &req)
+		if err != nil {
+			return fmt.Errorf("failed to create master token: %v", err)
+		}
+
+	}
+	return nil
+}
+
 // reconcile is used to reconcile the differences between Serf
 // membership and what is reflected in our strongly consistent store.
 // Mainly we need to ensure all live nodes are registered, all failed

consul/state_store.go

@@ -1504,7 +1504,9 @@ func (s *StateStore) invalidateLocks(index uint64, tx *MDBTxn,
 }
 
 // ACLSet is used to create or update an ACL entry
-func (s *StateStore) ACLSet(index uint64, acl *structs.ACL) error {
+// allowCreate is used for initialization of the anonymous and master tokens,
+// since it permits them to be created with a specified ID that does not exist.
+func (s *StateStore) ACLSet(index uint64, acl *structs.ACL, allowCreate bool) error {
 	// Start a new txn
 	tx, err := s.tables.StartTxn(false)
 	if err != nil {
@@ -1537,7 +1539,11 @@ func (s *StateStore) ACLSet(index uint64, acl *structs.ACL) error {
 
 		switch len(res) {
 		case 0:
-			return fmt.Errorf("Invalid ACL")
+			if !allowCreate {
+				return fmt.Errorf("Invalid ACL")
+			}
+			acl.CreateIndex = index
+			acl.ModifyIndex = index
 		case 1:
 			exist := res[0].(*structs.ACL)
 			acl.CreateIndex = exist.CreateIndex

consul/state_store_test.go

@@ -656,7 +656,7 @@ func TestStoreSnapshot(t *testing.T) {
 		Name: "User token",
 		Type: structs.ACLTypeClient,
 	}
-	if err := store.ACLSet(19, a1); err != nil {
+	if err := store.ACLSet(19, a1, false); err != nil {
 		t.Fatalf("err: %v", err)
 	}
 
@@ -664,7 +664,7 @@ func TestStoreSnapshot(t *testing.T) {
 		Name: "User token",
 		Type: structs.ACLTypeClient,
 	}
-	if err := store.ACLSet(20, a2); err != nil {
+	if err := store.ACLSet(20, a2, false); err != nil {
 		t.Fatalf("err: %v", err)
 	}
 
@@ -2180,7 +2180,7 @@ func TestACLSet_Get(t *testing.T) {
 		Type:  structs.ACLTypeClient,
 		Rules: "",
 	}
-	if err := store.ACLSet(50, a); err != nil {
+	if err := store.ACLSet(50, a, false); err != nil {
 		t.Fatalf("err: %v", err)
 	}
 	if a.CreateIndex != 50 {
@@ -2206,7 +2206,7 @@ func TestACLSet_Get(t *testing.T) {
 
 	// Update
 	a.Rules = "foo bar baz"
-	if err := store.ACLSet(52, a); err != nil {
+	if err := store.ACLSet(52, a, false); err != nil {
 		t.Fatalf("err: %v", err)
 	}
 	if a.CreateIndex != 50 {
@@ -2240,7 +2240,7 @@ func TestACLDelete(t *testing.T) {
 		Type:  structs.ACLTypeClient,
 		Rules: "",
 	}
-	if err := store.ACLSet(50, a); err != nil {
+	if err := store.ACLSet(50, a, false); err != nil {
 		t.Fatalf("err: %v", err)
 	}
 
@@ -2274,7 +2274,7 @@ func TestACLList(t *testing.T) {
 		Name: "User token",
 		Type: structs.ACLTypeClient,
 	}
-	if err := store.ACLSet(50, a1); err != nil {
+	if err := store.ACLSet(50, a1, false); err != nil {
 		t.Fatalf("err: %v", err)
 	}
 
@@ -2282,7 +2282,7 @@ func TestACLList(t *testing.T) {
 		Name: "User token",
 		Type: structs.ACLTypeClient,
 	}
-	if err := store.ACLSet(51, a2); err != nil {
+	if err := store.ACLSet(51, a2, false); err != nil {
 		t.Fatalf("err: %v", err)
 	}
 

consul/structs/structs.go

@@ -439,8 +439,9 @@ type ACLs []*ACL
 type ACLOp string
 
 const (
-	ACLSet    ACLOp = "set"
-	ACLDelete       = "delete"
+	ACLSet      ACLOp = "set"
+	ACLForceSet       = "force-set"
+	ACLDelete         = "delete"
 )
 
 // ACLRequest is used to create, update or delete an ACL