Add new Azure CA certs. (#180)

Closes #178.

Author: jburhenn

internal/integration/mqtt/auth/azure_iot_hub.go

@@ -44,6 +44,67 @@ R9I4LtD+gdwyah617jzV/OeBHRnDJELqYzmp
 -----END CERTIFICATE-----
 `
 
+const microsoftRSARootCA2017 = `
+-----BEGIN CERTIFICATE-----
+MIIFqDCCA5CgAwIBAgIQHtOXCV/YtLNHcB6qvn9FszANBgkqhkiG9w0BAQwFADBl
+MQswCQYDVQQGEwJVUzEeMBwGA1UEChMVTWljcm9zb2Z0IENvcnBvcmF0aW9uMTYw
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+-----END CERTIFICATE-----
+`
+
+const digiCertGlobalRootG2 = `
+-----BEGIN CERTIFICATE-----
+MIIDjjCCAnagAwIBAgIQAzrx5qcRqaC7KGSxHQn65TANBgkqhkiG9w0BAQsFADBh
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+MrY=
+-----END CERTIFICATE-----
+`
+
 type authType int
 
 const (
@@ -72,8 +133,9 @@ func NewAzureIoTHubAuthentication(c config.Config) (Authentication, error) {
 	conf := c.Integration.MQTT.Auth.AzureIoTHub
 
 	certpool := x509.NewCertPool()
-	if !certpool.AppendCertsFromPEM([]byte(digiCertBaltimoreRootCA)) {
-		return nil, errors.New("append ca cert from pem error")
+	rootCAs := fmt.Sprintf("%s%s%s", digiCertBaltimoreRootCA, microsoftRSARootCA2017, digiCertGlobalRootG2)
+	if !certpool.AppendCertsFromPEM([]byte(rootCAs)) {
+		return nil, errors.New("append ca certs from pem error")
 	}
 	tlsConfig := tls.Config{
 		RootCAs: certpool,