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package secrets
import (
"context"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"fmt"
"sync"
"time"
"code.crute.us/mcrute/golib/log"
"code.crute.us/mcrute/golib/service"
)
type Handle interface {
Reference() string
}
type Renewal struct {
Name string
Critical bool
Time time.Time
Error error
}
type Credential struct {
Username string `json:"username" mapstructure:"username"`
Password string `json:"password" mapstructure:"password"`
}
type ApiKey struct {
Key string `json:"key" mapstructure:"key"`
}
type RSAKey struct {
Key string `json:"key" mapstructure:"key"`
}
func (k *RSAKey) RSAPrivateKey() (*rsa.PrivateKey, error) {
der, err := base64.StdEncoding.DecodeString(k.Key)
if err != nil {
return nil, err
}
pr, err := x509.ParsePKCS8PrivateKey(der)
if err != nil {
return nil, err
}
pk, ok := pr.(*rsa.PrivateKey)
if !ok {
return nil, fmt.Errorf("RSAKey: parsed key is not an rsa.PrivateKey")
}
return pk, nil
}
// Client is the interface that users of secrets returned by a secret
// back-end should expect. This interface contains only secret related
// functionality and none of the functions for running the back-end
// itself. This is separate from the manager functions to make it easier
// to inject stubs to code that doesn't care about the fact that a
// manager may exist.
type Client interface {
DatabaseCredential(context.Context, string) (*Credential, Handle, error)
Secret(context.Context, string, any) (Handle, error)
WriteSecret(context.Context, string, any) error
Destroy(Handle) error
MakeNonCritical(Handle) error
}
// ClientManager is like a Client, and contains a Client, but also
// contains other runtime functionality for running the secret back-end
// infrastructure that most consumers of secretes don't care about but
// the main process runner does.
type ClientManager interface {
Client
Authenticate(context.Context) error
Notifications() <-chan Renewal
Run(context.Context, *sync.WaitGroup) error
}
// MakeRenewalLogger subscribes to a ClientManager notification channel
// and logs those to the logger. If a critical credential fails the
// terminator callback will be called which should shut down the
// application in an orderly fashion.
func MakeRenewalLogger(cm ClientManager, log log.LeveledLogger, terminator func()) service.RunnerFunc {
return func(ctx context.Context, wg *sync.WaitGroup) error {
wg.Add(1)
defer wg.Done()
for {
select {
case r := <-cm.Notifications():
if r.Error != nil {
if r.Critical {
log.Errorf("Failed to renew critical secret %s due to %s", r.Name, r.Error)
terminator()
} else {
log.Errorf("Failed to renew non-critical secret %s", r.Name)
}
} else {
log.Infof("Renewing credential %s", r.Name)
}
case <-ctx.Done():
log.Infof("Shutting down secret renewal logger")
return nil
}
}
}
}
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