How to get SSL protocol version (php)

Question

I've got a server Apache/2.2.22 (Debian) with PHP/5.4.45-0+deb7u5.

I need to get a php environment variable that specifies which SSL protocol version is used between client and server (I mean TLS 1.1, TLS 1.2 etc.).

So, I will use that variable in a script to get different options using TLS 1.1 or TLS 1.2 etc...

That server has got OpenSSL/1.0.1t.

user149341 · Accepted Answer · 2016-12-20 21:27:20Z

4

The SSL_PROTOCOL environment variable should have what you're looking for. It's documented in the Apache manual for mod_ssl, along with other SSL variables.

Note that some hosting environments may not make this variable available. If you don't see it, you may need to add SSLOptions +StdEnvVars to your web server configuration, or to an .htaccess file.

answered Dec 20, 2016 at 21:27

user149341

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3 Comments

John Over a year ago

Adding SSLOptions +StdEnvVars to my .htaccess I've got a new environment variable called REDIRECT_SSL_PROTOCOL . At the present value of that variable is TLSv1.2 . Is that the variable I'm looking for?

user149341 Over a year ago

Yep, that's the one. The prefixed REDIRECT_ is probably an artifact of your mod_rewrite configuration.

John Over a year ago

Updating: on Apache 2.4/PHP 7.3 the environment variable is SSL_PROTOCOL.

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