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Log tls session keys to SSLKEYLOGFILE env #520

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Log tls session keys to SSLKEYLOGFILE env #520

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91a06ec
add sslkeylogfile support for pebble
orangepizza Oct 21, 2025
3a6237e
use standard env variable instead of config file option
orangepizza Oct 23, 2025
2354dd5
lint fix
orangepizza Oct 23, 2025
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26 changes: 22 additions & 4 deletions cmd/pebble/main.go
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Original file line number Diff line number Diff line change
@@ -1,8 +1,10 @@
package main

import (
"crypto/tls"
"flag"
"fmt"
"io"
"log"
"net/http"
"os"
Expand All @@ -27,6 +29,7 @@ type config struct {
TLSPort int
Certificate string
PrivateKey string
SSLKeyLogFile string
OCSPResponderURL string
// Require External Account Binding for "newAccount" requests
ExternalAccountBindingRequired bool
Expand Down Expand Up @@ -162,13 +165,28 @@ func main() {
logger.Print("Management interface is disabled")
}

var ssllog io.Writer
ssllogfile, err := os.OpenFile(os.Getenv("SSLKEYLOGFILE"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o600)
if err != nil {
ssllog = nil
} else {
logger.Printf("TLS session key of Pebble will be logged at %s", c.Pebble.SSLKeyLogFile)
ssllog = ssllogfile
defer ssllogfile.Close()
}
pebbleserver := http.Server{
TLSConfig: &tls.Config{
KeyLogWriter: ssllog,
},
Addr: c.Pebble.ListenAddress,
Handler: muxHandler,
}

logger.Printf("Listening on: %s\n", c.Pebble.ListenAddress)
logger.Printf("ACME directory available at: https://%s%s",
c.Pebble.ListenAddress, wfe.DirectoryPath)
err = http.ListenAndServeTLS(
c.Pebble.ListenAddress,
err = pebbleserver.ListenAndServeTLS(
c.Pebble.Certificate,
c.Pebble.PrivateKey,
muxHandler)
c.Pebble.PrivateKey)
cmd.FailOnError(err, "Calling ListenAndServeTLS()")
}
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