/
static_token.go
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/
static_token.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package secrets
import (
"fmt"
"sort"
"strings"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/infodata"
)
const (
// DataKeyStaticTokenCSV is the key in a secret data holding the CSV format of a secret.
DataKeyStaticTokenCSV = "static_tokens.csv"
// DataKeyUserID is the key in a secret data holding the userID.
DataKeyUserID = "userID"
// DataKeyGroups is the key in a secret data holding the groups.
DataKeyGroups = "groups"
// DataKeyToken is the key in a secret data holding the token.
DataKeyToken = "token"
)
// StaticTokenSecretConfig contains the specification a to-be-generated static token secret.
type StaticTokenSecretConfig struct {
Name string
Tokens map[string]TokenConfig
}
// TokenConfig contains configuration for a token.
type TokenConfig struct {
Username string
UserID string
Groups []string
}
// StaticToken contains the username, the password, optionally hash of the password and the format for serializing the static token
type StaticToken struct {
Name string
Tokens []Token
}
// Token contains fields of a generated token.
type Token struct {
Username string
UserID string
Groups []string
Token string
}
// GetName returns the name of the secret.
func (s *StaticTokenSecretConfig) GetName() string {
return s.Name
}
// Generate implements ConfigInterface.
func (s *StaticTokenSecretConfig) Generate() (DataInterface, error) {
return s.GenerateStaticToken()
}
// GenerateInfoData implements ConfigInterface.
func (s *StaticTokenSecretConfig) GenerateInfoData() (infodata.InfoData, error) {
tokens := make(map[string]string)
for username := range s.Tokens {
token, err := utils.GenerateRandomString(128)
if err != nil {
return nil, err
}
tokens[username] = token
}
return NewStaticTokenInfoData(tokens), nil
}
// GenerateFromInfoData implements ConfigInterface.
func (s *StaticTokenSecretConfig) GenerateFromInfoData(infoData infodata.InfoData) (DataInterface, error) {
data, ok := infoData.(*StaticTokenInfoData)
if !ok {
return nil, fmt.Errorf("could not convert InfoData entry %s to StaticTokenInfoData", s.Name)
}
var usernames []string
for username := range data.Tokens {
usernames = append(usernames, username)
}
sort.Strings(usernames)
tokens := make([]Token, 0, len(s.Tokens))
for _, username := range usernames {
tokens = append(tokens, Token{
Username: s.Tokens[username].Username,
UserID: s.Tokens[username].UserID,
Groups: s.Tokens[username].Groups,
Token: data.Tokens[username],
})
}
return &StaticToken{
Name: s.Name,
Tokens: tokens,
}, nil
}
// LoadFromSecretData implements infodata.Loader.
func (s *StaticTokenSecretConfig) LoadFromSecretData(secretData map[string][]byte) (infodata.InfoData, error) {
staticToken, err := LoadStaticTokenFromCSV(s.Name, secretData[DataKeyStaticTokenCSV])
if err != nil {
return nil, err
}
tokens := make(map[string]string)
for _, token := range staticToken.Tokens {
tokens[token.Username] = token.Token
}
return NewStaticTokenInfoData(tokens), nil
}
// GenerateStaticToken computes a random token of length 128.
func (s *StaticTokenSecretConfig) GenerateStaticToken() (*StaticToken, error) {
tokens := make([]Token, 0, len(s.Tokens))
for _, tokenConfig := range s.Tokens {
token, err := utils.GenerateRandomString(128)
if err != nil {
return nil, err
}
tokens = append(tokens, Token{
Username: tokenConfig.Username,
UserID: tokenConfig.UserID,
Groups: tokenConfig.Groups,
Token: token,
})
}
return &StaticToken{
Name: s.Name,
Tokens: tokens,
}, nil
}
// SecretData computes the data map which can be used in a Kubernetes secret.
func (b *StaticToken) SecretData() map[string][]byte {
var (
data = make(map[string][]byte, 1)
tokens = make([]string, 0, len(b.Tokens))
)
for _, token := range b.Tokens {
groups := strings.Join(token.Groups, ",")
if len(token.Groups) > 1 {
groups = fmt.Sprintf("%q", groups)
}
tokens = append(tokens, fmt.Sprintf("%s,%s,%s,%s", token.Token, token.Username, token.UserID, groups))
}
data[DataKeyStaticTokenCSV] = []byte(strings.Join(tokens, "\n"))
return data
}
// GetTokenForUsername returns the token for the given username.
func (b *StaticToken) GetTokenForUsername(username string) (*Token, error) {
for _, token := range b.Tokens {
if token.Username == username {
return &token, nil
}
}
return nil, fmt.Errorf("could not find token for username %q", username)
}
// LoadStaticTokenFromCSV loads the static token data from the given CSV-formatted <data>.
func LoadStaticTokenFromCSV(name string, data []byte) (*StaticToken, error) {
var (
lines = strings.Split(string(data), "\n")
tokens = make([]Token, 0, len(lines))
)
for _, token := range lines {
csv := strings.Split(token, ",")
if len(csv) < 4 {
return nil, fmt.Errorf("invalid CSV for loading static token data: %s", string(data))
}
tokens = append(tokens, Token{
Username: csv[1],
UserID: csv[2],
Groups: strings.Split(csv[3], ","),
Token: csv[0],
})
}
return &StaticToken{
Name: name,
Tokens: tokens,
}, nil
}