khenaidoo | ab1f7bd | 2019-11-14 14:00:27 -0500 | [diff] [blame] | 1 | // Copyright 2015 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package v2auth |
| 16 | |
| 17 | import ( |
| 18 | "context" |
| 19 | "encoding/json" |
| 20 | "path" |
| 21 | |
| 22 | "go.etcd.io/etcd/etcdserver" |
| 23 | "go.etcd.io/etcd/etcdserver/api/v2error" |
| 24 | "go.etcd.io/etcd/etcdserver/etcdserverpb" |
| 25 | |
| 26 | "go.uber.org/zap" |
| 27 | ) |
| 28 | |
| 29 | func (s *store) ensureAuthDirectories() error { |
| 30 | if s.ensuredOnce { |
| 31 | return nil |
| 32 | } |
| 33 | for _, res := range []string{StorePermsPrefix, StorePermsPrefix + "/users/", StorePermsPrefix + "/roles/"} { |
| 34 | ctx, cancel := context.WithTimeout(context.Background(), s.timeout) |
| 35 | pe := false |
| 36 | rr := etcdserverpb.Request{ |
| 37 | Method: "PUT", |
| 38 | Path: res, |
| 39 | Dir: true, |
| 40 | PrevExist: &pe, |
| 41 | } |
| 42 | _, err := s.server.Do(ctx, rr) |
| 43 | cancel() |
| 44 | if err != nil { |
| 45 | if e, ok := err.(*v2error.Error); ok { |
| 46 | if e.ErrorCode == v2error.EcodeNodeExist { |
| 47 | continue |
| 48 | } |
| 49 | } |
| 50 | if s.lg != nil { |
| 51 | s.lg.Warn( |
| 52 | "failed to create auth directories", |
| 53 | zap.Error(err), |
| 54 | ) |
| 55 | } else { |
| 56 | plog.Errorf("failed to create auth directories in the store (%v)", err) |
| 57 | } |
| 58 | return err |
| 59 | } |
| 60 | } |
| 61 | ctx, cancel := context.WithTimeout(context.Background(), s.timeout) |
| 62 | defer cancel() |
| 63 | pe := false |
| 64 | rr := etcdserverpb.Request{ |
| 65 | Method: "PUT", |
| 66 | Path: StorePermsPrefix + "/enabled", |
| 67 | Val: "false", |
| 68 | PrevExist: &pe, |
| 69 | } |
| 70 | _, err := s.server.Do(ctx, rr) |
| 71 | if err != nil { |
| 72 | if e, ok := err.(*v2error.Error); ok { |
| 73 | if e.ErrorCode == v2error.EcodeNodeExist { |
| 74 | s.ensuredOnce = true |
| 75 | return nil |
| 76 | } |
| 77 | } |
| 78 | return err |
| 79 | } |
| 80 | s.ensuredOnce = true |
| 81 | return nil |
| 82 | } |
| 83 | |
| 84 | func (s *store) enableAuth() error { |
| 85 | _, err := s.updateResource("/enabled", true) |
| 86 | return err |
| 87 | } |
| 88 | func (s *store) disableAuth() error { |
| 89 | _, err := s.updateResource("/enabled", false) |
| 90 | return err |
| 91 | } |
| 92 | |
| 93 | func (s *store) detectAuth() bool { |
| 94 | if s.server == nil { |
| 95 | return false |
| 96 | } |
| 97 | value, err := s.requestResource("/enabled", false) |
| 98 | if err != nil { |
| 99 | if e, ok := err.(*v2error.Error); ok { |
| 100 | if e.ErrorCode == v2error.EcodeKeyNotFound { |
| 101 | return false |
| 102 | } |
| 103 | } |
| 104 | if s.lg != nil { |
| 105 | s.lg.Warn( |
| 106 | "failed to detect auth settings", |
| 107 | zap.Error(err), |
| 108 | ) |
| 109 | } else { |
| 110 | plog.Errorf("failed to detect auth settings (%s)", err) |
| 111 | } |
| 112 | return false |
| 113 | } |
| 114 | |
| 115 | var u bool |
| 116 | err = json.Unmarshal([]byte(*value.Event.Node.Value), &u) |
| 117 | if err != nil { |
| 118 | if s.lg != nil { |
| 119 | s.lg.Warn( |
| 120 | "internal bookkeeping value for enabled isn't valid JSON", |
| 121 | zap.Error(err), |
| 122 | ) |
| 123 | } else { |
| 124 | plog.Errorf("internal bookkeeping value for enabled isn't valid JSON (%v)", err) |
| 125 | } |
| 126 | return false |
| 127 | } |
| 128 | return u |
| 129 | } |
| 130 | |
| 131 | func (s *store) requestResource(res string, quorum bool) (etcdserver.Response, error) { |
| 132 | ctx, cancel := context.WithTimeout(context.Background(), s.timeout) |
| 133 | defer cancel() |
| 134 | p := path.Join(StorePermsPrefix, res) |
| 135 | method := "GET" |
| 136 | if quorum { |
| 137 | method = "QGET" |
| 138 | } |
| 139 | rr := etcdserverpb.Request{ |
| 140 | Method: method, |
| 141 | Path: p, |
| 142 | Dir: false, // TODO: always false? |
| 143 | } |
| 144 | return s.server.Do(ctx, rr) |
| 145 | } |
| 146 | |
| 147 | func (s *store) updateResource(res string, value interface{}) (etcdserver.Response, error) { |
| 148 | return s.setResource(res, value, true) |
| 149 | } |
| 150 | func (s *store) createResource(res string, value interface{}) (etcdserver.Response, error) { |
| 151 | return s.setResource(res, value, false) |
| 152 | } |
| 153 | func (s *store) setResource(res string, value interface{}, prevexist bool) (etcdserver.Response, error) { |
| 154 | err := s.ensureAuthDirectories() |
| 155 | if err != nil { |
| 156 | return etcdserver.Response{}, err |
| 157 | } |
| 158 | ctx, cancel := context.WithTimeout(context.Background(), s.timeout) |
| 159 | defer cancel() |
| 160 | data, err := json.Marshal(value) |
| 161 | if err != nil { |
| 162 | return etcdserver.Response{}, err |
| 163 | } |
| 164 | p := path.Join(StorePermsPrefix, res) |
| 165 | rr := etcdserverpb.Request{ |
| 166 | Method: "PUT", |
| 167 | Path: p, |
| 168 | Val: string(data), |
| 169 | PrevExist: &prevexist, |
| 170 | } |
| 171 | return s.server.Do(ctx, rr) |
| 172 | } |
| 173 | |
| 174 | func (s *store) deleteResource(res string) error { |
| 175 | err := s.ensureAuthDirectories() |
| 176 | if err != nil { |
| 177 | return err |
| 178 | } |
| 179 | ctx, cancel := context.WithTimeout(context.Background(), s.timeout) |
| 180 | defer cancel() |
| 181 | pex := true |
| 182 | p := path.Join(StorePermsPrefix, res) |
| 183 | _, err = s.server.Do(ctx, etcdserverpb.Request{ |
| 184 | Method: "DELETE", |
| 185 | Path: p, |
| 186 | PrevExist: &pex, |
| 187 | }) |
| 188 | return err |
| 189 | } |