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https://github.com/drakkan/sftpgo.git
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432 lines
10 KiB
Go
432 lines
10 KiB
Go
// Copyright (C) 2019-2022 Nicola Murino
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published
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// by the Free Software Foundation, version 3.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// Package kms provides Key Management Services support
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package kms
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import (
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"encoding/json"
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"errors"
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"os"
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"strings"
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"sync"
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sdkkms "github.com/sftpgo/sdk/kms"
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"github.com/drakkan/sftpgo/v2/logger"
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)
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// SecretProvider defines the interface for a KMS secrets provider
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type SecretProvider interface {
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Name() string
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Encrypt() error
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Decrypt() error
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IsEncrypted() bool
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GetStatus() sdkkms.SecretStatus
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GetPayload() string
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GetKey() string
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GetAdditionalData() string
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GetMode() int
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SetKey(string)
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SetAdditionalData(string)
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SetStatus(sdkkms.SecretStatus)
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Clone() SecretProvider
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}
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const (
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logSender = "kms"
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)
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// Configuration defines the KMS configuration
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type Configuration struct {
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Secrets Secrets `json:"secrets" mapstructure:"secrets"`
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}
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// Secrets define the KMS configuration for encryption/decryption
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type Secrets struct {
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URL string `json:"url" mapstructure:"url"`
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MasterKeyPath string `json:"master_key_path" mapstructure:"master_key_path"`
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MasterKeyString string `json:"master_key" mapstructure:"master_key"`
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masterKey string
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}
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type registeredSecretProvider struct {
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encryptedStatus sdkkms.SecretStatus
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newFn func(base BaseSecret, url, masterKey string) SecretProvider
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}
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var (
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// ErrWrongSecretStatus defines the error to return if the secret status is not appropriate
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// for the request operation
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ErrWrongSecretStatus = errors.New("wrong secret status")
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// ErrInvalidSecret defines the error to return if a secret is not valid
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ErrInvalidSecret = errors.New("invalid secret")
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validSecretStatuses = []string{sdkkms.SecretStatusPlain, sdkkms.SecretStatusAES256GCM, sdkkms.SecretStatusSecretBox,
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sdkkms.SecretStatusVaultTransit, sdkkms.SecretStatusAWS, sdkkms.SecretStatusGCP, sdkkms.SecretStatusRedacted}
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config Configuration
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secretProviders = make(map[string]registeredSecretProvider)
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)
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// RegisterSecretProvider register a new secret provider
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func RegisterSecretProvider(scheme string, encryptedStatus sdkkms.SecretStatus,
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fn func(base BaseSecret, url, masterKey string) SecretProvider,
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) {
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secretProviders[scheme] = registeredSecretProvider{
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encryptedStatus: encryptedStatus,
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newFn: fn,
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}
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}
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// NewSecret builds a new Secret using the provided arguments
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func NewSecret(status sdkkms.SecretStatus, payload, key, data string) *Secret {
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return config.newSecret(status, payload, key, data)
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}
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// NewEmptySecret returns an empty secret
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func NewEmptySecret() *Secret {
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return NewSecret("", "", "", "")
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}
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// NewPlainSecret stores the give payload in a plain text secret
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func NewPlainSecret(payload string) *Secret {
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return NewSecret(sdkkms.SecretStatusPlain, strings.TrimSpace(payload), "", "")
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}
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// Initialize configures the KMS support
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func (c *Configuration) Initialize() error {
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if c.Secrets.MasterKeyString != "" {
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c.Secrets.masterKey = c.Secrets.MasterKeyString
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}
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if c.Secrets.masterKey == "" && c.Secrets.MasterKeyPath != "" {
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mKey, err := os.ReadFile(c.Secrets.MasterKeyPath)
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if err != nil {
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return err
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}
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c.Secrets.masterKey = strings.TrimSpace(string(mKey))
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}
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config = *c
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if config.Secrets.URL == "" {
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config.Secrets.URL = sdkkms.SchemeLocal + "://"
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}
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for k, v := range secretProviders {
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logger.Info(logSender, "", "secret provider registered for scheme: %#v, encrypted status: %#v",
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k, v.encryptedStatus)
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}
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return nil
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}
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func (c *Configuration) newSecret(status sdkkms.SecretStatus, payload, key, data string) *Secret {
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base := BaseSecret{
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Status: status,
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Key: key,
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Payload: payload,
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AdditionalData: data,
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}
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return &Secret{
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provider: c.getSecretProvider(base),
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}
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}
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func (c *Configuration) getSecretProvider(base BaseSecret) SecretProvider {
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for k, v := range secretProviders {
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if strings.HasPrefix(c.Secrets.URL, k) {
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return v.newFn(base, c.Secrets.URL, c.Secrets.masterKey)
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}
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}
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logger.Warn(logSender, "", "no secret provider registered for URL %v, fallback to local provider", c.Secrets.URL)
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return NewLocalSecret(base, c.Secrets.URL, c.Secrets.masterKey)
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}
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// Secret defines the struct used to store confidential data
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type Secret struct {
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sync.RWMutex
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provider SecretProvider
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}
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// MarshalJSON return the JSON encoding of the Secret object
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func (s *Secret) MarshalJSON() ([]byte, error) {
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s.RLock()
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defer s.RUnlock()
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return json.Marshal(&BaseSecret{
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Status: s.provider.GetStatus(),
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Payload: s.provider.GetPayload(),
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Key: s.provider.GetKey(),
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AdditionalData: s.provider.GetAdditionalData(),
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Mode: s.provider.GetMode(),
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})
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}
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// UnmarshalJSON parses the JSON-encoded data and stores the result
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// in the Secret object
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func (s *Secret) UnmarshalJSON(data []byte) error {
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s.Lock()
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defer s.Unlock()
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baseSecret := BaseSecret{}
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err := json.Unmarshal(data, &baseSecret)
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if err != nil {
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return err
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}
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if baseSecret.isEmpty() {
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s.provider = config.getSecretProvider(baseSecret)
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return nil
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}
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if baseSecret.Status == sdkkms.SecretStatusPlain || baseSecret.Status == sdkkms.SecretStatusRedacted {
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s.provider = config.getSecretProvider(baseSecret)
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return nil
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}
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for _, v := range secretProviders {
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if v.encryptedStatus == baseSecret.Status {
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s.provider = v.newFn(baseSecret, config.Secrets.URL, config.Secrets.masterKey)
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return nil
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}
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}
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logger.Error(logSender, "", "no provider registered for status %#v", baseSecret.Status)
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return ErrInvalidSecret
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}
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// IsEqual returns true if all the secrets fields are equal
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func (s *Secret) IsEqual(other *Secret) bool {
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if s.GetStatus() != other.GetStatus() {
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return false
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}
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if s.GetPayload() != other.GetPayload() {
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return false
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}
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if s.GetKey() != other.GetKey() {
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return false
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}
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if s.GetAdditionalData() != other.GetAdditionalData() {
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return false
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}
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if s.GetMode() != other.GetMode() {
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return false
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}
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return true
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}
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// Clone returns a copy of the secret object
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func (s *Secret) Clone() *Secret {
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s.RLock()
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defer s.RUnlock()
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return &Secret{
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provider: s.provider.Clone(),
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}
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}
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// IsEncrypted returns true if the secret is encrypted
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// This isn't a pointer receiver because we don't want to pass
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// a pointer to html template
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func (s *Secret) IsEncrypted() bool {
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s.RLock()
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defer s.RUnlock()
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return s.provider.IsEncrypted()
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}
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// IsPlain returns true if the secret is in plain text
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func (s *Secret) IsPlain() bool {
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s.RLock()
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defer s.RUnlock()
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return s.provider.GetStatus() == sdkkms.SecretStatusPlain
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}
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// IsNotPlainAndNotEmpty returns true if the secret is not plain and not empty.
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// This is an utility method, we update the secret for an existing user
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// if it is empty or plain
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func (s *Secret) IsNotPlainAndNotEmpty() bool {
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s.RLock()
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defer s.RUnlock()
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return !s.IsPlain() && !s.IsEmpty()
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}
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// IsRedacted returns true if the secret is redacted
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func (s *Secret) IsRedacted() bool {
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s.RLock()
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defer s.RUnlock()
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return s.provider.GetStatus() == sdkkms.SecretStatusRedacted
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}
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// GetPayload returns the secret payload
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func (s *Secret) GetPayload() string {
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s.RLock()
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defer s.RUnlock()
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return s.provider.GetPayload()
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}
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// GetAdditionalData returns the secret additional data
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func (s *Secret) GetAdditionalData() string {
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s.RLock()
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defer s.RUnlock()
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return s.provider.GetAdditionalData()
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}
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// GetStatus returns the secret status
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func (s *Secret) GetStatus() sdkkms.SecretStatus {
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s.RLock()
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defer s.RUnlock()
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return s.provider.GetStatus()
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}
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// GetKey returns the secret key
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func (s *Secret) GetKey() string {
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s.RLock()
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defer s.RUnlock()
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return s.provider.GetKey()
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}
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// GetMode returns the secret mode
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func (s *Secret) GetMode() int {
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s.RLock()
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defer s.RUnlock()
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return s.provider.GetMode()
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}
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// SetAdditionalData sets the given additional data
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func (s *Secret) SetAdditionalData(value string) {
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s.Lock()
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defer s.Unlock()
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s.provider.SetAdditionalData(value)
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}
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// SetStatus sets the status for this secret
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func (s *Secret) SetStatus(value sdkkms.SecretStatus) {
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s.Lock()
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defer s.Unlock()
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s.provider.SetStatus(value)
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}
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// SetKey sets the key for this secret
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func (s *Secret) SetKey(value string) {
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s.Lock()
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defer s.Unlock()
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s.provider.SetKey(value)
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}
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// IsEmpty returns true if all fields are empty
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func (s *Secret) IsEmpty() bool {
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s.RLock()
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defer s.RUnlock()
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if s.provider.GetStatus() != "" {
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return false
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}
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if s.provider.GetPayload() != "" {
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return false
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}
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if s.provider.GetKey() != "" {
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return false
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}
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if s.provider.GetAdditionalData() != "" {
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return false
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}
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return true
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}
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// IsValid returns true if the secret is not empty and valid
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func (s *Secret) IsValid() bool {
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s.RLock()
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defer s.RUnlock()
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if !s.IsValidInput() {
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return false
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}
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switch s.provider.GetStatus() {
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case sdkkms.SecretStatusAES256GCM, sdkkms.SecretStatusSecretBox:
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if len(s.provider.GetKey()) != 64 {
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return false
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}
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case sdkkms.SecretStatusAWS, sdkkms.SecretStatusGCP, sdkkms.SecretStatusVaultTransit:
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key := s.provider.GetKey()
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if key != "" && len(key) != 64 {
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return false
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}
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}
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return true
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}
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// IsValidInput returns true if the secret is a valid user input
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func (s *Secret) IsValidInput() bool {
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s.RLock()
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defer s.RUnlock()
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if !isSecretStatusValid(s.provider.GetStatus()) {
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return false
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}
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if s.provider.GetPayload() == "" {
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return false
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}
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return true
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}
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// Hide hides info to decrypt data
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func (s *Secret) Hide() {
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s.Lock()
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defer s.Unlock()
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s.provider.SetKey("")
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s.provider.SetAdditionalData("")
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}
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// Encrypt encrypts a plain text Secret object
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func (s *Secret) Encrypt() error {
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s.Lock()
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defer s.Unlock()
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return s.provider.Encrypt()
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}
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// Decrypt decrypts a Secret object
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func (s *Secret) Decrypt() error {
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s.Lock()
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defer s.Unlock()
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return s.provider.Decrypt()
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}
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// TryDecrypt decrypts a Secret object if encrypted.
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// It returns a nil error if the object is not encrypted
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func (s *Secret) TryDecrypt() error {
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s.Lock()
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defer s.Unlock()
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if s.provider.IsEncrypted() {
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return s.provider.Decrypt()
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}
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return nil
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}
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func isSecretStatusValid(status string) bool {
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for idx := range validSecretStatuses {
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if validSecretStatuses[idx] == status {
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return true
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}
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}
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return false
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}
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