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)

Installation

You can download testssl.sh by cloning this git repository:

git clone --depth 1 --branch 2.9.5 https://github.com/drwetter/testssl.sh.git

Or help yourself downloading the ZIP archive https://github.com/drwetter/testssl.sh/archive/v2.9.5-1.zip. Then testssl.sh --help will give you some help upfront. More help: see doc directory. Older sample runs are at https://testssl.sh/.

Compatibility

testssl.sh is working on every Linux/BSD distribution out of the box. In 2.9.5 most of the limitations of disabled features from the openssl client are gone due to bash-socket-based checks. testssl.sh also works on other unixoid system out of the box, supposed they have /bin/bash and standard tools like sed and awk installed. System V needs to have GNU versions of grep installed. MacOS X and Windows (using MSYS2 or cygwin) work too. OpenSSL version >= 1.0.2 is recommended, you will get further with earlier openssl versions in this interim release though as most of the checks in 2.9 are done via sockets.

Update notification here or @ twitter.

Status

2.9.5 is an interim release snapshot from the current 2.9dev version. It has reached a point which is considered to be mature enough for day-to-day usage before taking the next step in the development of this project.

2.9.5 has less bugs and has evolved considerably since 2.8.

Features implemented in 2.9.5

• Way better coverage of ciphers as most checks are done via sockets, using bash sockets where ever possible
• Further tests via TLS sockets and improvements (handshake parsing, completeness, robustness)
• Testing 359 default ciphers (testssl.sh -e/-E) with a mixture of sockets and openssl. Same speed as with openssl only but addtional ciphers such as post-quantum ciphers, new CHAHA20/POLY1305, CamelliaGCM etc.
• TLS 1.2 protocol check via sockets in production
• Finding more TLS extensions via sockets
• TLS Supported Groups Registry (RFC 7919), key shares extension
• Non-flat JSON output support
• File output (CSV, JSON flat, JSON non-flat) supports a minimum severity level (only above supplied level there will be output)
• Native HTML support instead going through 'aha'
• LUCKY13 and SWEET32 checks
• Ticketbleed check
• LOGJAM: now checking also for known DH parameters
• Support of supplying timeout value for openssl connect -- useful for batch/mass scanning
• Parallel mass testing
• Check for CAA RR
• Check for OCSP must staple
• Check for Certificate Transparency
• Check for session resumption (Ticket, ID)
• Better formatting of output (indentation)
• Choice showing the RFC naming scheme only
• File input for mass testing can be also in nmap grep(p)able (-oG) format
• Postgres und MySQL STARTTLS support
• Man page

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 a coding guideline.

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

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