![]() ![]() ![]() The openssl ciphers command will output even ciphers that are not allowed, unless the -s switch is given. ![]() TLS_AES_128_GCM_SHA256 TLSv1.3 Kx=any Au=any Enc=AESGCM(128) Mac=AEADĮCDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD The list of allowed ciphers in a security level can be obtained with the openssl ciphers command (output truncated for brevity): $ openssl ciphers -s -v TLSv1.3 Kx=any Au=any Enc=AESGCM(256) Mac=AEAD That default is also set at package building time, and in the case of Ubuntu, it’s set to SECLEVEL=2. In Ubuntu Jammy, TLS versions below 1.2 are disabled in OpenSSL’s SECLEVEL=2 due to this patch. To adjust the algorithms and ciphers used in a SSL/TLS connection, we are interested in the “SSL Configuration” section of the library, where we can define the behavior of server, client, and the library defaults.įor example, in an Ubuntu Jammy installation, we have (omitting unrelated entries for brevity): openssl_conf = openssl_initĬipherString = gives us our first information about the default set of ciphers and algorithms used by OpenSSL in an Ubuntu installation: What that means is detailed inside the SSL_CTX_set_security_level(3) manpage. See how it’s like a chain, where a key ( openssl_conf) points at the name of a section, and that section has a key that points to another section, and so on. This is what it looks like: openssl_conf = The ssl config manpage has all the details. It starts with a nameless default section, not inside any block, and after that we have the traditional followed by the key = value lines. The OpenSSL configuration file is very similar to a standard INI file. In particular, we will only cover the settings that control which cryptographic algorithms will be allowed by default. It is simple in structure, but quite complex in the details, and it won’t be fully covered here. The OpenSSL configuration file is located at /etc/ssl/openssl.cnf and is used both by the library itself and the command-line tools included in the package. OpenSSL is probably the most well known cryptographic library, used by thousands of projects and applications. Multi-node configuration with Docker-Composeĭistributed Replicated Block Device (DRBD) ![]()
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