khenaidoo | ffe076b | 2019-01-15 16:08:08 -0500 | [diff] [blame^] | 1 | // Copyright 2016 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 auth |
| 16 | |
| 17 | // CAUTION: This randum number based token mechanism is only for testing purpose. |
| 18 | // JWT based mechanism will be added in the near future. |
| 19 | |
| 20 | import ( |
| 21 | "context" |
| 22 | "crypto/rand" |
| 23 | "fmt" |
| 24 | "math/big" |
| 25 | "strconv" |
| 26 | "strings" |
| 27 | "sync" |
| 28 | "time" |
| 29 | ) |
| 30 | |
| 31 | const ( |
| 32 | letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 33 | defaultSimpleTokenLength = 16 |
| 34 | ) |
| 35 | |
| 36 | // var for testing purposes |
| 37 | var ( |
| 38 | simpleTokenTTL = 5 * time.Minute |
| 39 | simpleTokenTTLResolution = 1 * time.Second |
| 40 | ) |
| 41 | |
| 42 | type simpleTokenTTLKeeper struct { |
| 43 | tokens map[string]time.Time |
| 44 | donec chan struct{} |
| 45 | stopc chan struct{} |
| 46 | deleteTokenFunc func(string) |
| 47 | mu *sync.Mutex |
| 48 | } |
| 49 | |
| 50 | func (tm *simpleTokenTTLKeeper) stop() { |
| 51 | select { |
| 52 | case tm.stopc <- struct{}{}: |
| 53 | case <-tm.donec: |
| 54 | } |
| 55 | <-tm.donec |
| 56 | } |
| 57 | |
| 58 | func (tm *simpleTokenTTLKeeper) addSimpleToken(token string) { |
| 59 | tm.tokens[token] = time.Now().Add(simpleTokenTTL) |
| 60 | } |
| 61 | |
| 62 | func (tm *simpleTokenTTLKeeper) resetSimpleToken(token string) { |
| 63 | if _, ok := tm.tokens[token]; ok { |
| 64 | tm.tokens[token] = time.Now().Add(simpleTokenTTL) |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | func (tm *simpleTokenTTLKeeper) deleteSimpleToken(token string) { |
| 69 | delete(tm.tokens, token) |
| 70 | } |
| 71 | |
| 72 | func (tm *simpleTokenTTLKeeper) run() { |
| 73 | tokenTicker := time.NewTicker(simpleTokenTTLResolution) |
| 74 | defer func() { |
| 75 | tokenTicker.Stop() |
| 76 | close(tm.donec) |
| 77 | }() |
| 78 | for { |
| 79 | select { |
| 80 | case <-tokenTicker.C: |
| 81 | nowtime := time.Now() |
| 82 | tm.mu.Lock() |
| 83 | for t, tokenendtime := range tm.tokens { |
| 84 | if nowtime.After(tokenendtime) { |
| 85 | tm.deleteTokenFunc(t) |
| 86 | delete(tm.tokens, t) |
| 87 | } |
| 88 | } |
| 89 | tm.mu.Unlock() |
| 90 | case <-tm.stopc: |
| 91 | return |
| 92 | } |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | type tokenSimple struct { |
| 97 | indexWaiter func(uint64) <-chan struct{} |
| 98 | simpleTokenKeeper *simpleTokenTTLKeeper |
| 99 | simpleTokensMu sync.Mutex |
| 100 | simpleTokens map[string]string // token -> username |
| 101 | } |
| 102 | |
| 103 | func (t *tokenSimple) genTokenPrefix() (string, error) { |
| 104 | ret := make([]byte, defaultSimpleTokenLength) |
| 105 | |
| 106 | for i := 0; i < defaultSimpleTokenLength; i++ { |
| 107 | bInt, err := rand.Int(rand.Reader, big.NewInt(int64(len(letters)))) |
| 108 | if err != nil { |
| 109 | return "", err |
| 110 | } |
| 111 | |
| 112 | ret[i] = letters[bInt.Int64()] |
| 113 | } |
| 114 | |
| 115 | return string(ret), nil |
| 116 | } |
| 117 | |
| 118 | func (t *tokenSimple) assignSimpleTokenToUser(username, token string) { |
| 119 | t.simpleTokensMu.Lock() |
| 120 | defer t.simpleTokensMu.Unlock() |
| 121 | if t.simpleTokenKeeper == nil { |
| 122 | return |
| 123 | } |
| 124 | |
| 125 | _, ok := t.simpleTokens[token] |
| 126 | if ok { |
| 127 | plog.Panicf("token %s is alredy used", token) |
| 128 | } |
| 129 | |
| 130 | t.simpleTokens[token] = username |
| 131 | t.simpleTokenKeeper.addSimpleToken(token) |
| 132 | } |
| 133 | |
| 134 | func (t *tokenSimple) invalidateUser(username string) { |
| 135 | if t.simpleTokenKeeper == nil { |
| 136 | return |
| 137 | } |
| 138 | t.simpleTokensMu.Lock() |
| 139 | for token, name := range t.simpleTokens { |
| 140 | if strings.Compare(name, username) == 0 { |
| 141 | delete(t.simpleTokens, token) |
| 142 | t.simpleTokenKeeper.deleteSimpleToken(token) |
| 143 | } |
| 144 | } |
| 145 | t.simpleTokensMu.Unlock() |
| 146 | } |
| 147 | |
| 148 | func (t *tokenSimple) enable() { |
| 149 | delf := func(tk string) { |
| 150 | if username, ok := t.simpleTokens[tk]; ok { |
| 151 | plog.Infof("deleting token %s for user %s", tk, username) |
| 152 | delete(t.simpleTokens, tk) |
| 153 | } |
| 154 | } |
| 155 | t.simpleTokenKeeper = &simpleTokenTTLKeeper{ |
| 156 | tokens: make(map[string]time.Time), |
| 157 | donec: make(chan struct{}), |
| 158 | stopc: make(chan struct{}), |
| 159 | deleteTokenFunc: delf, |
| 160 | mu: &t.simpleTokensMu, |
| 161 | } |
| 162 | go t.simpleTokenKeeper.run() |
| 163 | } |
| 164 | |
| 165 | func (t *tokenSimple) disable() { |
| 166 | t.simpleTokensMu.Lock() |
| 167 | tk := t.simpleTokenKeeper |
| 168 | t.simpleTokenKeeper = nil |
| 169 | t.simpleTokens = make(map[string]string) // invalidate all tokens |
| 170 | t.simpleTokensMu.Unlock() |
| 171 | if tk != nil { |
| 172 | tk.stop() |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | func (t *tokenSimple) info(ctx context.Context, token string, revision uint64) (*AuthInfo, bool) { |
| 177 | if !t.isValidSimpleToken(ctx, token) { |
| 178 | return nil, false |
| 179 | } |
| 180 | t.simpleTokensMu.Lock() |
| 181 | username, ok := t.simpleTokens[token] |
| 182 | if ok && t.simpleTokenKeeper != nil { |
| 183 | t.simpleTokenKeeper.resetSimpleToken(token) |
| 184 | } |
| 185 | t.simpleTokensMu.Unlock() |
| 186 | return &AuthInfo{Username: username, Revision: revision}, ok |
| 187 | } |
| 188 | |
| 189 | func (t *tokenSimple) assign(ctx context.Context, username string, rev uint64) (string, error) { |
| 190 | // rev isn't used in simple token, it is only used in JWT |
| 191 | index := ctx.Value(AuthenticateParamIndex{}).(uint64) |
| 192 | simpleTokenPrefix := ctx.Value(AuthenticateParamSimpleTokenPrefix{}).(string) |
| 193 | token := fmt.Sprintf("%s.%d", simpleTokenPrefix, index) |
| 194 | t.assignSimpleTokenToUser(username, token) |
| 195 | |
| 196 | return token, nil |
| 197 | } |
| 198 | |
| 199 | func (t *tokenSimple) isValidSimpleToken(ctx context.Context, token string) bool { |
| 200 | splitted := strings.Split(token, ".") |
| 201 | if len(splitted) != 2 { |
| 202 | return false |
| 203 | } |
| 204 | index, err := strconv.Atoi(splitted[1]) |
| 205 | if err != nil { |
| 206 | return false |
| 207 | } |
| 208 | |
| 209 | select { |
| 210 | case <-t.indexWaiter(uint64(index)): |
| 211 | return true |
| 212 | case <-ctx.Done(): |
| 213 | } |
| 214 | |
| 215 | return false |
| 216 | } |
| 217 | |
| 218 | func newTokenProviderSimple(indexWaiter func(uint64) <-chan struct{}) *tokenSimple { |
| 219 | return &tokenSimple{ |
| 220 | simpleTokens: make(map[string]string), |
| 221 | indexWaiter: indexWaiter, |
| 222 | } |
| 223 | } |