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testssl.sh is a free command line tool which checks a server's service on any port for the support of TLS/SSL ciphers, protocols as well as some cryptographic flaws.

• Clear output: you can tell easily whether anything is good or bad
• Ease of installation: It works for Linux, Darwin, FreeBSD and MSYS2/Cygwin out of the box: no need to install or configure something, no gems, CPAN, pip or the like.
• Flexibility: You can test any SSL/TLS enabled and STARTTLS service, not only webservers at port 443
• Toolbox: Several command line options help you to run YOUR test and configure YOUR output
• Reliability: features are tested thoroughly
• Verbosity: If a particular check cannot be performed because of a missing capability on your client side, you'll get a warning
• Privacy: It's only you who sees the result, not a third party
• Freedom: It's 100% open source. You can look at the code, see what's going on and you can change it.
• Heck, even the development is open (github)

Here in the master branch you find the development version of the software -- with new features and maybe some bugs. For the stable version and a more thorough description of the command line options please see testssl.sh.

testssl.sh is working on every Linux/BSD distribution out of the box with some limitations of disabled features from the openssl client -- some workarounds are done with bash-socket-based checks. It also works on other unixoid system out of the box, supposed they have /bin/bash and standard tools like sed and awk installed. MacOS X and Windows (using MSYS2 or cygwin) work too. OpenSSL version >= 1 is a must. OpenSSL version >= 1.0.2 is needed for better LOGJAM checks and to display bit strengths for key exchanges.

Planned features in the release 2.7dev/2.8 are:

https://github.com/drwetter/testssl.sh/milestones/2.7dev%20%282.8%29

Done so far:

• Trust chain check against certificate stores from Apple (OS), Linux (OS), Microsoft (OS), Mozilla (Firefox Browser), works for openssl >=1.0.1
• IPv6 (status: 80% working, details see drwetter#11
• works on servers requiring a x509 certificate for authentication
• SSL Session ID check
• avahi/mDNS based name resolution
• HTTP2/ALPN protocol check
• Logging to a file / dir
• Logging to JSON + CSV
• check for multiple server certificates
• browser cipher simulation
• assistance for color-blind users
• Even more compatibility improvements for FreeBSD, RH-ish and F5 systems
• Considerable speed improvements for each cipher runs (-e/-E)
• more robust socket interface
• OpenSSL 1.1.0 compliant
• whole number of busg squashed

Update notification here or @ twitter.

Contributions, feedback, bug reports are welcome! For contributions please note: One patch per feature -- bug fix/improvement. Please test your changes thouroughly as reliability is important for this project.

There's coding guideline.

Please file bug reports @ https://github.com/drwetter/testssl.sh/issues.

For a start see the wiki. Help is needed here.

Please file bugs in the issue tracker. Do not forget to provide detailed information, see https://github.com/drwetter/testssl.sh/wiki/Findings-and-HowTo-Fix-them#file-a-proper-bug-report Nobody can read your thoughts -- yet.

Please address questions not specifically to the code of testssl.sh to the respective projects

• https://github.com/TKCERT/testssl.sh-webfrontend

• https://quay.io/repository/jumanjiman/testssl
• https://hub.docker.com/r/mvance/testssl/

• see #233 and https://github.com/Homebrew/homebrew