Wednesday, January 19, 2011

libcloud 0.4.2 and SSL

Libcloud 0.4.2 was released yesterday. Among its new features is an important one: SSL certificate validation is now supported when opening a connection to a cloud provider. However, for this to work, you have to jump through a couple of hoops.

1) Python 2.5 doesn't have the ssl module installed (2.6 does) -- so you need to install it from PyPI. The current version for ssl is 1.15.

2) By default, SSL cert validation is disabled in libcloud.

If you open a connection to a provider you get:

UserWarning: SSL certificate verification is disabled, this can pose a
security risk. For more information how to enable the SSL certificate
verification, please visit the libcloud documentation.

To get past the warning, you need to enable SSL cert validation and also provide a path to a file containing common CA certificates (if you don't have that file, you can download cacert.pem from for example). Add these lines before opening a connection:
import = True"/path/to/cacert.pem")
As an aside, the libcloud wiki page on SSL is very helpful and I used it to figure out what to do.

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