Correct location of openssl cnf file

Question

I have an Ubuntu system and I have installed OpenSSL  Now I want to make changes to the config file  I searched my folders and found the following locations for the config files  Which is the main correct one that I should use to make changes  I need to add an engine here  Any help would be appreciated  Here are the locations    usr local ssl openssl cnf  usr lib ssl openssl cnf  etc ssl openssl cnf

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On my CentOS 6 I have two openssl cnf     openvpn easy-rsa   pki tls

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RHEL   etc pki tls openssl cnf

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usr local ssl openssl cnf   is soft link of       etc ssl openssl cnf   You can see that using long list  ls -l  on the  usr local ssl  directory where you will find      lrwxrwxrwx 1 root root   20 Mar  1 05 15 openssl cnf -     etc ssl openssl cnf

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usr local ssl openssl cnf  This is a local installation  You downloaded and built OpenSSL taking the default prefix  of you configured with   config --prefix  usr local ssl or   config --openssldir  usr local ssl  You will use this if you use the OpenSSL in  usr local ssl bin  That is   usr local ssl openssl cnf will be used when you issue   usr local ssl bin openssl s client -connect localhost 443 -tls1 -servername localhost     usr lib ssl openssl cnf  This is where Ubuntu places openssl cnf for the OpenSSL they provide  You will use this if you use the OpenSSL in  usr bin  That is   usr lib ssl openssl cnf will be used when you issue  openssl s client -connect localhost 443 -tls1 -servername localhost     etc ssl openssl cnf  I don t know when this is used  The stuff in  etc ssl is usually certificates and private keys  and it sometimes contains a copy of openssl cnf  But I ve never seen it used for anything    Which is the main correct one that I should use to make changes   From the sounds of it  you should probably add the engine to  usr lib ssl openssl cnf  That ensures most  quot off the shelf quot  gear will use the new engine  After you do that  add it to  usr local ssl openssl cnf also because copy paste is easy   Here s how to see which openssl cnf directory is associated with a OpenSSL installation  The library and programs look for openssl cnf in OPENSSLDIR  OPENSSLDIR is a configure option  and its set with --openssldir  I m on a MacBook with 3 different OpenSSL s  Apple s  MacPort s and the one I build     Apple        usr bin openssl version -a   grep OPENSSLDIR OPENSSLDIR   quot  System Library OpenSSL quot     MacPorts    opt local bin openssl version -a   grep OPENSSLDIR OPENSSLDIR   quot  opt local etc openssl quot     My build of OpenSSL   openssl version -a   grep OPENSSLDIR OPENSSLDIR   quot  usr local ssl darwin quot     I have an Ubuntu system and I have installed openssl   Just bike shedding  but be careful of Ubuntu s version of OpenSSL  It disables TLSv1 1 and TLSv1 2  so you will only have clients capable of older cipher suites  and you will not be able to use newer ciphers like AES CTR  to replace RC4  and elliptic curve gear  like ECDHE ECDSA   and ECDHE RSA     See Ubuntu 12 04 LTS  OpenSSL downlevel version is 1 0 0  and does not support TLS 1 2 in Launchpad  EDIT  Ubuntu enabled TLS 1 1 and TLS 1 2 recently  See Comment 17 on the bug report

[openssl] Correct location of openssl.cnf file

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