How to list supported ciphers suites of a server?

I run into a problem of how to check whether my SSL ciphers suites configuration works correctly on my server.
Basically, with openssl, client can verify if the server supports a particular cipher suite using the following command:

openssl s_client -cipher "$cipher" -CAfile ca/ca.crt -connect server:port
# $cipher is the cipher suite name

So it is possible to automatically test all cipher suites supported by openssl against the server using a simple snippet of Bash, i found such script in this site and modify it a little bit. Below is the script:

#!/usr/bin/env bash

# OpenSSL requires the port number.
ciphers=$(openssl ciphers 'ALL:eNULL' | sed -e 's/:/ /g')

echo Obtaining cipher list from $(openssl version).

for cipher in ${ciphers[@]}
    echo -n Testing $cipher...
    result=$(echo -n | openssl s_client -cipher "$cipher"  -connect $SERVER 2>&1)
    if [[ "$result" =~ ":error:" ]] ; then
        error=$(echo -n $result | cut -d':' -f6)
        echo NO \($error\)
        if echo $result | grep -q "Verify return code: 0 (ok)"; then
            echo YES
            echo UNKNOWN RESPONSE
            echo $result
sleep $DELAY

Rust tip: (Unix) drop the current user privileges


Rust is a modern programing language which is claimed to be blazingly fast and memory-efficient. It syntactically similar to C++, but is designed to provide better memory safety while maintaining high performance and productivity:

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  • Great documentation, easy to use compiler and integrated packages/libraries management
  • Easy to interface with other language.
  • A bit of learning curve for the variable ownership and variable lifetime features.
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