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Fix MQTT cert validation with custom CA #27

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Fix MQTT cert validation with custom CA #27

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17 changes: 16 additions & 1 deletion src/HASS.Agent.Staging/HASS.Agent/MQTT/MqttManager.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -641,7 +641,22 @@ private static ManagedMqttClientOptions GetOptions()
if (!string.IsNullOrEmpty(Variables.AppSettings.MqttRootCertificate))
{
if (!File.Exists(Variables.AppSettings.MqttRootCertificate)) Log.Error("[MQTT] Provided root certificate not found: {cert}", Variables.AppSettings.MqttRootCertificate);
else certificates.Add(new X509Certificate2(Variables.AppSettings.MqttRootCertificate));
else
{
X509Certificate2 caCrt = new(Variables.AppSettings.MqttRootCertificate);
certificates.Add(caCrt);
tlsParameters.CertificateValidationHandler = (certContext) => {
X509Chain chain = new();
chain.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck;
chain.ChainPolicy.RevocationFlag = X509RevocationFlag.ExcludeRoot;
chain.ChainPolicy.VerificationFlags = X509VerificationFlags.NoFlag;
chain.ChainPolicy.VerificationTime = DateTime.Now;
chain.ChainPolicy.UrlRetrievalTimeout = new TimeSpan(0, 0, 0);
chain.ChainPolicy.CustomTrustStore.Add(caCrt);
chain.ChainPolicy.TrustMode = X509ChainTrustMode.CustomRootTrust;
return chain.Build(new X509Certificate2(certContext.Certificate));
};
}
}

if (!string.IsNullOrEmpty(Variables.AppSettings.MqttClientCertificate))
Expand Down