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.

Time has passed by, development evolved. It is not recommended to use 2.9.5 anymore. There are bugs in 2.9.5 which would require larger efforts to fix. As of 2019 it is recommended to switch to the 2.9dev branch -- 3.0 release is imminent, it's build on 2.9.5., it has matured and has less known bugs.

Features implemented in 2.9.5

• Way better coverage of ciphers as most checks are done via 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 thoroughly 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