DESCRIPTION

testssl 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 recent cryptographic flaws and more.

Key features:

* 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)

-h, --help

what you're looking at

-b, --banner

displays banner + version of testssl

-v, --version

same as previous

-V, --local

pretty print all local ciphers

-V, --local <pattern>

which local ciphers with <pattern> are available? (if pattern not a number: word match)

testssl <options> URI ("testssl URI" does everything except -E)

-e, --each-cipher

checks each local cipher remotely

-E, --cipher-per-proto

checks those per protocol

-f, --ciphers

checks common cipher suites

-p, --protocols

checks TLS/SSL protocols

-S, --server_defaults

displays the servers default picks and certificate info

-P, --preference

displays the servers picks: protocol+cipher

-y, --spdy, --npn

checks for SPDY/NPN

-x, --single-cipher <pattern> tests matched <pattern> of ciphers

(if <pattern> not a number: word match)

-U, --vulnerable

tests all vulnerabilities

-B, --heartbleed

tests for heartbleed vulnerability

-I, --ccs, --ccs-injection

tests for CCS injection vulnerability

-R, --renegotiation

tests for renegotiation vulnerabilities

-C, --compression, --crime

tests for CRIME vulnerability

-T, --breach

tests for BREACH vulnerability

-O, --poodle

tests for POODLE (SSL) vulnerability

-Z, --tls-fallback

checks TLS_FALLBACK_SCSV mitigation

-F, --freak

tests for FREAK vulnerability

-A, --beast

tests for BEAST vulnerability

-J, --logjam

tests for LOGJAM vulnerability

-s, --pfs, --fs,--nsa

checks (perfect) forward secrecy settings

-4, --rc4, --appelbaum

which RC4 ciphers are being offered?

-H, --header, --headers

tests HSTS, HPKP, server/app banner, security headers, cookie, reverse proxy, IPv4 address

special invocations:

-t, --starttls <protocol>

does a default run against a STARTTLS enabled <protocol>

--xmpphost <to_domain>

for STARTTLS enabled XMPP it supplies the XML stream to-'' domain -- sometimes needed

--mx <domain/host>

tests MX records from high to low priority (STARTTLS, port 25)

--ip <ipv4>

a) tests the supplied <ipv4> instead of resolving host(s) in URI b) arg "one" means: just test the first DNS returns (useful for multiple IPs)

--file <file name>

mass testing option: Just put multiple testssl command lines in <file name>, one line per instance. Comments via # allowed, EOF signals end of <file name>.

partly mandatory parameters:

URI

host|host:port|URL|URL:port (port 443 is assumed unless otherwise specified)

pattern

an ignore case word pattern of cipher hexcode or any other string in the name, kx or bits

protocol

is one of ftp,smtp,pop3,imap,xmpp,telnet,ldap (for the latter two you need e.g. the supplied openssl)

tuning options:

--assuming-http

if protocol check fails it assumes HTTP protocol and enforces HTTP checks

--ssl-native

fallback to checks with OpenSSL where sockets are normally used

--openssl <PATH>

use this openssl binary (default: look in $PATH, $RUN_DIR of testssl

--proxy <host>:<port>

connect via the specified HTTP proxy

--sneaky

be less verbose wrt referer headers

--quiet

don't output the banner. By doing this you acknowledge usage terms normally appearing in the banner

--wide

wide output for tests like RC4, BEAST. PFS also with hexcode, kx, strength, RFC name

--show-each

for wide outputs: display all ciphers tested -- not only succeeded ones

--warnings <batch|off|false>

"batch" doesn't wait for keypress, "off" or "false" skips connection warning

--color <0|1|2>

0: no escape or other codes, 1: b/w escape codes, 2: color (default)

--debug <0-6>

1: screen output normal but debug output in temp files. 2-6: see line ~105

All options requiring a value can also be called with '=' (e.g. testssl -t=,smtp/ --wide --openssl=/usr/bin/openssl <URI>. <URI> is always the last parameter.

Need HTML output? Just pipe through "aha" (Ansi HTML Adapter: github.com/theZiz/aha) like

"testssl <options> <URI> | aha >output.html"

AUTHOR

This manual page was written by ChangZhuo Chen <[email protected]> for the Debian GNU/Linux system (but may be used by others).