CODEWITHSUNDEEP
c++opensslenvironment-variables
Alexander Trotsenko
Alexander Trotsenko

Reputation: 504

How to ignore an OPENSSL_ENGINES environment variable in my app?

I'm using openssl library in my C++ app. I've found out how to ignore an OPENSSL_CONF environment variable. It's possible by specifying of my own config file:

OPENSSL_config("openssl.cnf");

But what about an OPENSSL_ENGINES environment variable? How can it's value be ignored in my app? How to prevent loading the engines from this path?

I've a look at openssl sources. There is the OPENSSL_ENGINES variable reads by default without any conditions.

...
if ((load_dir = getenv("OPENSSL_ENGINES")) == 0)
    load_dir = ENGINESDIR;
...

Upvotes: 1

Views: 1072

Answers (1)

Reinier Torenbeek
Reinier Torenbeek

Reputation: 17383

OpenSSL does not seem to expose a proper way to ignore that environment variable. As a workaround, you could set that environment variable yourself to some bogus value before invoking ENGINE_by_id(), like this:

putenv("OPENSSL_ENGINES=/dev/null");

You will have to be a little careful that the bogus value you choose does not happen to exist as a valid path on the file system. /dev/null could be an option, depending on your environment.

Upvotes: 1

Related Questions