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# apachectl -version
Server version: Apache/2.4.7 (Ubuntu)
Server built:   Jul 22 2014 14:36:38

I've got ssl.conf configured with the default SSLCipherSuite (SSLCipherSuite HIGH:MEDIUM:!aNULL:!MD5). I've also tested all sort of combinations.

I've checked the ciphers available on the host using openssl ciphers, and there are plenty of RSA ciphers.

Here are the dependencies of my mod_ssl.so:

 # locate mod_ssl.so
 /usr/lib/apache2/modules/mod_ssl.so

 # ldd `locate mod_ssl.so`
 linux-vdso.so.1 => (0x00007fffb5dfe000)
 libssl.so.1.0.0 => /lib/x86_64-linux-gnu/libssl.so.1.0.0 (0x00007f915c0ba000)
 libcrypto.so.1.0.0 => /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 (0x00007f915bce0000)
 [... omitted libpthread and libc ...]

Ldd on /usr/bin/openssl yields the same dependencies on libssl and libcrypto (v 1.0.0).

I cannot get a connection using the RSA cipher. I checked those using openssl s_client -connect <server>:<port> -cipher 'ANY-RSA-CIPHER'.

I also ran an analysis on https://www.ssllabs.com which confirms the openssl commands: only DSS is supported.

This is a problem as firefox 37 does not support DSS anymore, resulting in a ssl_error_no_cypher_overlap error.

Any idea?

  • What SSLCipherSuite lines have you tried, specifically? Do you have additional SSLCipherSuite lines somewhere in your configuration that may be overriding what you're trying to set? – Hyppy Apr 28 '15 at 18:06
  • 2
    Using openssl ciphers will tell you what your openssl is capable of; but apache may not have been linked against the same libraries. Consider running ldd against mod_ssl.so and openssl and see if anything's missing. e.g.: my mod_ssl.so (FreeBSD) uses libssl, libcrypt, and libcrypto. – ericx Apr 29 '15 at 4:20
  • Thanks for your quick answers, I've updated the question, but I just found a good lead... I keep you posted! – Bruno Bieth Apr 30 '15 at 16:58
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I figured it out : the private key was using DSA...

Kinda stupid!

I generated another private key & self-signed certificate using RSA and... voilà!

openssl req -x509 -nodes -days 3650 -newkey rsa:2048 [...]

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