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Merge branch 'rdpgw-cert-hot-reload' into 'main'
feat(rdpgw): hot reload the tls certificate See merge request isard/isardvdi!1627
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,109 @@ | ||
package tls | ||
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// Copied between https://github.com/kubernetes-sigs/controller-runtime/blob/master/pkg/certwatcher/certwatcher.go and https://stackoverflow.com/a/40883377 | ||
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import ( | ||
"context" | ||
"crypto/tls" | ||
"fmt" | ||
"sync" | ||
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"github.com/fsnotify/fsnotify" | ||
"github.com/rs/zerolog" | ||
) | ||
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type keypairReloader struct { | ||
mux sync.RWMutex | ||
watcher *fsnotify.Watcher | ||
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cert *tls.Certificate | ||
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certPath string | ||
keyPath string | ||
} | ||
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func NewKeyPairReloader(certPath, keyPath string) (*keypairReloader, error) { | ||
kpr := &keypairReloader{ | ||
certPath: certPath, | ||
keyPath: keyPath, | ||
} | ||
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if err := kpr.ReadCertificate(); err != nil { | ||
return nil, err | ||
} | ||
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watcher, err := fsnotify.NewWatcher() | ||
if err != nil { | ||
return nil, fmt.Errorf("create certificate filesystem watcher: %w", err) | ||
} | ||
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kpr.watcher = watcher | ||
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return kpr, nil | ||
} | ||
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func (kpr *keypairReloader) Start(ctx context.Context, log *zerolog.Logger) error { | ||
files := []string{kpr.certPath, kpr.keyPath} | ||
for _, f := range files { | ||
if err := kpr.watcher.Add(f); err != nil { | ||
return fmt.Errorf("add '%s' to the filesystem watcher: %w", f, err) | ||
} | ||
} | ||
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go func() { | ||
for { | ||
select { | ||
case event, ok := <-kpr.watcher.Events: | ||
if !ok { | ||
return | ||
} | ||
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if event.Has(fsnotify.Remove) { | ||
if err := kpr.watcher.Add(event.Name); err != nil { | ||
log.Error().Err(err).Msg("rewatch certificate changes") | ||
} | ||
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} else if !event.Has(fsnotify.Create) && !event.Has(fsnotify.Write) { | ||
continue | ||
} | ||
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if err := kpr.ReadCertificate(); err != nil { | ||
log.Error().Err(err).Msg("reload certificate") | ||
} | ||
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log.Info().Msg("tls certificate reloaded") | ||
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case err, ok := <-kpr.watcher.Errors: | ||
if !ok { | ||
return | ||
} | ||
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log.Error().Err(err).Msg("certificate filesystem watch error") | ||
} | ||
} | ||
}() | ||
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<-ctx.Done() | ||
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return kpr.watcher.Close() | ||
} | ||
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func (kpr *keypairReloader) ReadCertificate() error { | ||
kpr.mux.Lock() | ||
defer kpr.mux.Unlock() | ||
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cert, err := tls.LoadX509KeyPair(kpr.certPath, kpr.keyPath) | ||
if err != nil { | ||
return fmt.Errorf("read tls certificate: %w", err) | ||
} | ||
kpr.cert = &cert | ||
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return nil | ||
} | ||
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func (kpr *keypairReloader) GetCertificate(*tls.ClientHelloInfo) (*tls.Certificate, error) { | ||
kpr.mux.RLock() | ||
defer kpr.mux.RUnlock() | ||
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return kpr.cert, nil | ||
} |
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