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package secrets
import (
"fmt"
"sync"
"github.com/moby/swarmkit/v2/agent/exec"
"github.com/moby/swarmkit/v2/api"
"github.com/moby/swarmkit/v2/identity"
)
// secrets is a map that keeps all the currently available secrets to the agent
// mapped by secret ID.
type secrets struct {
mu sync.RWMutex
m map[string]*api.Secret
}
// NewManager returns a place to store secrets.
func NewManager() exec.SecretsManager {
return &secrets{
m: make(map[string]*api.Secret),
}
}
// Get returns a secret by ID. If the secret doesn't exist, returns nil.
func (s *secrets) Get(secretID string) (*api.Secret, error) {
s.mu.RLock()
defer s.mu.RUnlock()
if s, ok := s.m[secretID]; ok {
return s, nil
}
return nil, fmt.Errorf("secret %s not found", secretID)
}
// Add adds one or more secrets to the secret map.
func (s *secrets) Add(secrets ...api.Secret) {
s.mu.Lock()
defer s.mu.Unlock()
for _, secret := range secrets {
s.m[secret.ID] = secret.Copy()
}
}
// Remove removes one or more secrets by ID from the secret map. Succeeds
// whether or not the given IDs are in the map.
func (s *secrets) Remove(secrets []string) {
s.mu.Lock()
defer s.mu.Unlock()
for _, secret := range secrets {
delete(s.m, secret)
}
}
// Reset removes all the secrets.
func (s *secrets) Reset() {
s.mu.Lock()
defer s.mu.Unlock()
s.m = make(map[string]*api.Secret)
}
// taskRestrictedSecretsProvider restricts the ids to the task.
type taskRestrictedSecretsProvider struct {
secrets exec.SecretGetter
secretIDs map[string]struct{} // allow list of secret ids
taskID string // ID of the task the provider restricts for
}
func (sp *taskRestrictedSecretsProvider) Get(secretID string) (*api.Secret, error) {
if _, ok := sp.secretIDs[secretID]; !ok {
return nil, fmt.Errorf("task not authorized to access secret %s", secretID)
}
// First check if the secret is available with the task specific ID, which is the concatenation
// of the original secret ID and the task ID with a dot in between.
// That is the case when a secret driver has returned DoNotReuse == true for a secret value.
taskSpecificID := identity.CombineTwoIDs(secretID, sp.taskID)
secret, err := sp.secrets.Get(taskSpecificID)
if err != nil {
// Otherwise, which is the default case, the secret is retrieved by its original ID.
return sp.secrets.Get(secretID)
}
// For all intents and purposes, the rest of the flow should deal with the original secret ID.
secret.ID = secretID
return secret, err
}
// Restrict provides a getter that only allows access to the secrets
// referenced by the task.
func Restrict(secrets exec.SecretGetter, t *api.Task) exec.SecretGetter {
sids := map[string]struct{}{}
container := t.Spec.GetContainer()
if container != nil {
for _, ref := range container.Secrets {
sids[ref.SecretID] = struct{}{}
}
}
return &taskRestrictedSecretsProvider{secrets: secrets, secretIDs: sids, taskID: t.ID}
}
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