/
secrets.go
222 lines (207 loc) · 4.95 KB
/
secrets.go
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package lib
import (
"context"
"fmt"
"reflect"
"strings"
"time"
"github.com/hashicorp/vault/api"
"go.uber.org/zap"
"golang.org/x/sync/errgroup"
)
type TokenNotRenewedError struct {
Err error
}
func (e TokenNotRenewedError) Error() string {
if e.Err == nil {
return "can't renew token"
}
return fmt.Sprintf("can't renew token: %s", e.Err)
}
type ExpiredSecretError struct {
Err error
Key string
}
func (e ExpiredSecretError) Error() string {
if e.Err == nil {
return fmt.Sprintf("secret expired %s", e.Key)
}
return fmt.Sprintf("can't renew secret %s: %s", e.Key, e.Err)
}
func equalsMap(m1, m2 map[string]string) bool {
if len(m1) != len(m2) {
return false
}
if m1 == nil && m2 != nil {
return false
}
if m1 != nil && m2 == nil {
return false
}
return reflect.DeepEqual(m1, m2)
}
func GetSecrets(ctx context.Context, clt *api.Client, prefix, up, once bool, keys []string, l *zap.SugaredLogger, results chan map[string]string) (e error) {
g, lctx := errgroup.WithContext(ctx)
defer func() {
err := g.Wait()
if err != nil {
e = err
}
}()
self, err := clt.Auth().Token().RenewSelf(0)
if err != nil {
return fmt.Errorf("vault token lookup error: %s", err)
}
if !once {
renewable, _ := self.TokenIsRenewable()
if renewable {
l.Info("token is renewable")
renewToken(lctx, g, clt, self, l)
} else {
l.Info("token is not renewable")
}
}
var previousResult map[string]string
for {
subg, llctx := errgroup.WithContext(lctx)
result, err := getSecretsHelper(llctx, subg, clt, prefix, up, once, keys, l)
if err != nil {
return err
}
if !equalsMap(result, previousResult) {
previousResult = result
select {
case results <- result:
case <-lctx.Done():
return lctx.Err()
}
}
err = subg.Wait()
if err == nil {
// should not happen
return context.Canceled
}
e, ok := err.(ExpiredSecretError)
if !ok {
return err
}
if e.Err != nil {
l.Infow("can't renew secret", "key", e.Key, "at", time.Now().Format(time.RFC3339), "error", e.Err)
} else {
l.Infow("secret has expired", "key", e.Key, "at", time.Now().Format(time.RFC3339))
}
}
}
func getSecretsHelper(ctx context.Context, g *errgroup.Group, clt *api.Client, prefix bool, up, once bool, keys []string, l *zap.SugaredLogger) (map[string]string, error) {
fullResults := make(map[string]map[string]string)
wait := func() {
g.Go(func() error {
<-ctx.Done()
return ctx.Err()
})
}
for _, k := range keys {
secretKey := k
secret, err := clt.Logical().Read(secretKey)
if err != nil {
return nil, fmt.Errorf("error reading secret from vault: %s", err)
}
if secret == nil {
wait()
continue
}
l.Debugw("secret read vault vault", "key", secretKey)
fullResults[secretKey] = make(map[string]string)
for k, v := range secret.Data {
if s, ok := v.(string); ok {
fullResults[secretKey][k] = s
} else if v != nil {
fullResults[secretKey][k] = fmt.Sprintf("%s", v)
}
}
if once {
wait()
continue
}
if secret.Renewable {
l.Infow("secret is renewable", "secret", secretKey)
renewSecret(ctx, g, secret, secretKey, clt, l)
} else {
l.Infow("secret is not renewable", "secret", secretKey)
wait()
}
}
result := make(map[string]string)
for secretKey, sValues := range fullResults {
for k, v := range sValues {
if prefix {
k = secretKey + "_" + k
}
k = Sanitize(k)
if up {
k = strings.ToUpper(k)
}
result[k] = v
}
}
return result, nil
}
func renewToken(ctx context.Context, g *errgroup.Group, clt *api.Client, token *api.Secret, l *zap.SugaredLogger) {
renewer, _ := clt.NewRenewer(&api.RenewerInput{
Secret: token,
})
g.Go(func() error {
renewer.Renew()
return nil
})
g.Go(func() error {
<-ctx.Done()
renewer.Stop()
return ctx.Err()
})
g.Go(func() error {
for {
select {
case err := <-renewer.DoneCh():
return TokenNotRenewedError{Err: err}
case renewal := <-renewer.RenewCh():
l.Infow("token renewed", "at", renewal.RenewedAt.Format(time.RFC3339), "lease", renewal.Secret.LeaseDuration)
}
}
})
}
func renewSecret(ctx context.Context, g *errgroup.Group, secret *api.Secret, secretKey string, clt *api.Client, l *zap.SugaredLogger) {
renewer, _ := clt.NewRenewer(&api.RenewerInput{
Secret: secret,
})
g.Go(func() error {
renewer.Renew()
return nil
})
g.Go(func() error {
<-ctx.Done()
renewer.Stop()
return ctx.Err()
})
g.Go(func() error {
lease := secret.LeaseDuration
for {
select {
case err := <-renewer.DoneCh():
lease = lease * 3 / 4
if lease == 0 {
return ExpiredSecretError{Err: err, Key: secretKey}
}
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(time.Duration(lease) * time.Second):
return ExpiredSecretError{Err: err, Key: secretKey}
}
case renewal := <-renewer.RenewCh():
lease = renewal.Secret.LeaseDuration
l.Infow("secret renewed", "secret", secretKey, "at", renewal.RenewedAt.Format(time.RFC3339), "lease", lease)
}
}
})
}