With a little help from Bash, you can fully automate this process.Īssume the client and the server hostnames are client and server, and that the server listens for SSL/TLS connections on port 443. You could also locate servers that accept weak protocols or ciphers and could thus allow a malicious attack. For example, you could use this protocol information to find servers that don’t accept a legitimate protocol or cipher, thus preventing a legitimate client from connecting.
This information is useful in security and functionality audits. S_client is particularly useful for checking which protocols and which ciphers the server agrees to use. I’ll start with a closer look at the s_client module. The third one is for connection timing tests.
The first two, as the names suggest, are for simulating a client and a server in an SSL connection. OpenSSL provides three modules that allow you to test SSL connections: s_client, s_server, and s_time.
#Openssl commands manual#
To use x509, you should execute the following command: openssl x509 -param1 param1valueīut to see the manual page for it, you should type: man x509. For example, a module named x509 manages X.509 digital certificates and a module named pkcs12 manages PKCS12 packages. On the other hand, each module has a separate manual page. Each module is not a separate executable, but is, instead, selected with the first parameter of the openssl executable.
The OpenSSL toolkit provides many modules that each perform a specific task. You can take advantage of these features to quickly write Bash (Bourne-Again Shell) scripts that automate tasks, such as testing SSL/TLS (Secure Socket Layer/Transport Layer Security) connections, bulk conversions between different formats of cryptographic keys and certificates, batch signing/encrypting of files, auditing password protected files, and implementing or testing a PKI (Public Key Infrastructure). OpenSSL makes use of standard input and standard output, and it supports a wide range of parameters, such as command-line switches, environment variables, named pipes, file descriptors, and files.
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