Intro

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.

Key features

• Clear output: you can tell easily whether anything is good or bad
• Ease of installation: It works for Linux, Darwin, FreeBSD, NetBSD 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)

General

Here in the master branch you find the stable version 2.8rc2 of the software, it superseds 2.6. Version 2.8 is currently being finalized. The 2.9dev branch is the developemnet -- 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 or https://github.com/drwetter/testssl.sh/wiki/Usage-Documentation.

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.

Features in 2.8 stable

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 https://github.com/drwetter/testssl.sh/issues/11
• works now on servers requiring a x509 certificate for authentication
• extensive CN <--> hostname check
• SSL Session ID check
• Avahi/mDNS based name resolution
• HTTP2/ALPN protocol check
• Logging to a file / dir
• Logging to (flat) JSON + CSV
• Check for multiple server certificates
• Browser cipher simulation: what client will connect with which cipher + protocol
• GOST cipher+certificate improvements
• Assistance for color-blind users
• Even more compatibility improvements for FreeBSD, NetBSD, Gentoo, RH-ish, F5 and Cisco systems
• Considerable speed improvements for each cipher runs (-e/-E)
• More robust SSLv2 + TLS socket interface
• seperate check for curves
• OpenSSL 1.1.0 compliant
• check for DROWN
• Whole number of bugs squashed

Update notification here or @ twitter.

Features in 2.9dev

• timeout in OpeenSL connect
• TLS 1.2 protocol check via socket

Contributions

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.

Documentation

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

Bug reports

Please file bugs in the issue tracker. Do not forget to provide detailed information, see https://github.com/drwetter/testssl.sh/wiki/Bug-reporting. (Nobody can read your thoughts -- yet. And only agencies your screen) ;-)

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External/related projects

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

Cool web frontend

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

mass scanner w parallel scans and elastic searching the results

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

Ready-to-go docker images are available at:

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

Brew package

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