RIPE Atlas Tracepath v0.3.0

I released a new version of my web application RIPE Atlas Tracepath: v0.3.0. It reads results from RIPE Atlas traceroute measurements and shows Autonomous Systems that probes go through to reach the target.

In the beginning it was a simple Python script/CGI; the new release has been totally rewritten, it’s now based on the D3.js visualization library and uses a more elegant Python backend based on Flask/WSGI.

Among the new features, probes are also displayed and linked to their origin AS; for those that completed the traceroute toward the target the avg RTT is also rendered in form of a scale of colors. Multiple Autonomous Systems can now be selected and moved together on the graph, in order to obtain the layout that best describes the analyzed scenario.

A demo can be found here. It only shows results from measurement ID 1674977, a traceroute from 50 probes all over the world toward

Graph of traceroute to

More details can be found on the GitHub page; feel free to use/edit/fork/improve it as you whish!

Certificate Transparency: manually verify SCT with openssl

The recent OpenSSL 1.0.2 version added support for Certificate Transparency (CT) RFC6962 by implementing one of the methods that allow TLS clients to receive and verify Signed Certificate Timestamp during the TLS handshake, that is the OCSP response extension. My goal here is to show how to use another method, the signed_certificate_timestamp TLS extension, to gain the same result.

Certificate Transparency - SCT via TLS Extension

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SHA-1 sunset: valid SHA-2 chains treated as insecure

While dealing with the SHA-1 sunsetting process I encountered a problem with some certificates from StartSSL/StartCom that may lead Chrome to raise warnings or even errors on websites with updated SHA-2-only chains (at least on Microsoft Windows clients).

Chrome yellow-triangle

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Displaying pmacct country code on a Kibana 4 map

On the Integration of pmacct with ElasticSearch and Kibana post a user (Xentoo) asked how to display geographic information provided by pmacct on a Kibana 4 map using pmacct-to-elasticsearch.

An experimental feature of p2es called transformations can be used to add a Geo Point field on the basis of the country code provided by pmacct.


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Italian Government mail servers STARTTLS support

After reading Antonio Prado’s Reverse DNS lookup for Italian Government’s mail exchangers post I got intrigued by the idea of checking how many of those Italian Government’s MX mail servers support STARTTLS.

STARTTLS “offers a way to upgrade a plain text connection to an encrypted (TLS or SSL) connection” (Wikipedia) and, when it’s implemented on the MX SMTP server, it allows a STARTTLS-aware user’s outbound mail server to encrypt the traffic toward the recipient’s server.

STARTTLS User to MX mail server

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