package consul import ( "sync/atomic" "time" "github.com/hashicorp/consul/acl" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/consul/lib" ) var serverACLCacheConfig *structs.ACLCachesConfig = &structs.ACLCachesConfig{ // The server's ACL caching has a few underlying assumptions: // // 1 - All policies can be resolved locally. Hence we do not cache any // unparsed policies/roles as we have memdb for that. // 2 - While there could be many identities being used within a DC the // number of distinct policies and combined multi-policy authorizers // will be much less. // 3 - If you need more than 10k tokens cached then you should probably // enable token replication or be using DC local tokens. In both // cases resolving the tokens from memdb will avoid the cache // entirely // Identities: 10 * 1024, Policies: 0, ParsedPolicies: 512, Authorizers: 1024, Roles: 0, } func (s *Server) checkTokenUUID(id string) (bool, error) { state := s.fsm.State() // We won't check expiration times here. If we generate a UUID that matches // a token that hasn't been reaped yet, then we won't be able to insert the // new token due to a collision. if _, token, err := state.ACLTokenGetByAccessor(nil, id, nil); err != nil { return false, err } else if token != nil { return false, nil } if _, token, err := state.ACLTokenGetBySecret(nil, id, nil); err != nil { return false, err } else if token != nil { return false, nil } return !structs.ACLIDReserved(id), nil } func (s *Server) checkPolicyUUID(id string) (bool, error) { state := s.fsm.State() if _, policy, err := state.ACLPolicyGetByID(nil, id, nil); err != nil { return false, err } else if policy != nil { return false, nil } return !structs.ACLIDReserved(id), nil } func (s *Server) checkRoleUUID(id string) (bool, error) { state := s.fsm.State() if _, role, err := state.ACLRoleGetByID(nil, id, nil); err != nil { return false, err } else if role != nil { return false, nil } return !structs.ACLIDReserved(id), nil } func (s *Server) checkBindingRuleUUID(id string) (bool, error) { state := s.fsm.State() if _, rule, err := state.ACLBindingRuleGetByID(nil, id, nil); err != nil { return false, err } else if rule != nil { return false, nil } return !structs.ACLIDReserved(id), nil } func (s *Server) updateACLAdvertisement() { // One thing to note is that once in new ACL mode the server will // never transition to legacy ACL mode. This is not currently a // supported use case. // always advertise to all the LAN Members lib.UpdateSerfTag(s.serfLAN, "acls", string(structs.ACLModeEnabled)) if s.serfWAN != nil { // advertise on the WAN only when we are inside the ACL datacenter lib.UpdateSerfTag(s.serfWAN, "acls", string(structs.ACLModeEnabled)) } } func (s *Server) canUpgradeToNewACLs(isLeader bool) bool { if atomic.LoadInt32(&s.useNewACLs) != 0 { // can't upgrade because we are already upgraded return false } if !s.InACLDatacenter() { numServers, mode, _ := ServersGetACLMode(s.WANMembers(), "", s.config.ACLDatacenter) if mode != structs.ACLModeEnabled || numServers == 0 { return false } } if isLeader { if _, mode, _ := ServersGetACLMode(s.LANMembers(), "", ""); mode == structs.ACLModeLegacy { return true } } else { leader := string(s.raft.Leader()) if _, _, leaderMode := ServersGetACLMode(s.LANMembers(), leader, ""); leaderMode == structs.ACLModeEnabled { return true } } return false } func (s *Server) InACLDatacenter() bool { return s.config.ACLDatacenter == "" || s.config.Datacenter == s.config.ACLDatacenter } func (s *Server) UseLegacyACLs() bool { return atomic.LoadInt32(&s.useNewACLs) == 0 } func (s *Server) LocalTokensEnabled() bool { // in ACL datacenter so local tokens are always enabled if s.InACLDatacenter() { return true } if !s.config.ACLTokenReplication || s.tokens.ReplicationToken() == "" { return false } // token replication is off so local tokens are disabled return true } func (s *Server) ACLDatacenter(legacy bool) string { // For resolution running on servers the only option // is to contact the configured ACL Datacenter if s.config.ACLDatacenter != "" { return s.config.ACLDatacenter } // This function only gets called if ACLs are enabled. // When no ACL DC is set then it is assumed that this DC // is the primary DC return s.config.Datacenter } func (s *Server) ACLsEnabled() bool { return s.config.ACLsEnabled } func (s *Server) ResolveIdentityFromToken(token string) (bool, structs.ACLIdentity, error) { // only allow remote RPC resolution when token replication is off and // when not in the ACL datacenter if !s.InACLDatacenter() && !s.config.ACLTokenReplication { return false, nil, nil } index, aclToken, err := s.fsm.State().ACLTokenGetBySecret(nil, token, nil) if err != nil { return true, nil, err } else if aclToken != nil && !aclToken.IsExpired(time.Now()) { return true, aclToken, nil } return s.InACLDatacenter() || index > 0, nil, acl.ErrNotFound } func (s *Server) ResolvePolicyFromID(policyID string) (bool, *structs.ACLPolicy, error) { index, policy, err := s.fsm.State().ACLPolicyGetByID(nil, policyID, nil) if err != nil { return true, nil, err } else if policy != nil { return true, policy, nil } // If the max index of the policies table is non-zero then we have acls, until then // we may need to allow remote resolution. This is particularly useful to allow updating // the replication token via the API in a non-primary dc. return s.InACLDatacenter() || index > 0, policy, acl.ErrNotFound } func (s *Server) ResolveRoleFromID(roleID string) (bool, *structs.ACLRole, error) { index, role, err := s.fsm.State().ACLRoleGetByID(nil, roleID, nil) if err != nil { return true, nil, err } else if role != nil { return true, role, nil } // If the max index of the roles table is non-zero then we have acls, until then // we may need to allow remote resolution. This is particularly useful to allow updating // the replication token via the API in a non-primary dc. return s.InACLDatacenter() || index > 0, role, acl.ErrNotFound } func (s *Server) ResolveToken(token string) (acl.Authorizer, error) { return s.acls.ResolveToken(token) } func (s *Server) filterACL(token string, subj interface{}) error { return s.acls.filterACL(token, subj) } func (s *Server) filterACLWithAuthorizer(authorizer acl.Authorizer, subj interface{}) error { return s.acls.filterACLWithAuthorizer(authorizer, subj) }