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SSH server & client auditing (banner, key exchange, encryption, mac, compression, compatibility, security, etc) .
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* Ignore all flake8 warnings - one by one Without ignoring, there are by far more than 1000 linting issues. Fixing these warnings means possibly changing almost every line of code, as single warnings can effect more than one line. Doing this in one pull request is generally no good idea, and especially not now, as the test suite is currently broken. Instead of just deactivating flake8, or ignoring its exit code, the warnings are ignored one by one. This means, when one wants to work on the linting issues, one can just remove one ignored warning, and fix the problems - which is not too much work at once, and leads to an managable diff. modified: tox.ini * Unpin dependencies for mypy run ... as they could not be installed due to compilation errors. modified: tox.ini * Fix syntax error for mypy When new code was added via |
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ssh-audit
ssh-audit is a tool for ssh server & client configuration auditing.
Features
- SSH1 and SSH2 protocol server support;
- analyze SSH client configuration;
- grab banner, recognize device or software and operating system, detect compression;
- gather key-exchange, host-key, encryption and message authentication code algorithms;
- output algorithm information (available since, removed/disabled, unsafe/weak/legacy, etc);
- output algorithm recommendations (append or remove based on recognized software version);
- output security information (related issues, assigned CVE list, etc);
- analyze SSH version compatibility based on algorithm information;
- historical information from OpenSSH, Dropbear SSH and libssh;
- runs on Linux and Windows;
- no dependencies
Usage
usage: ssh-audit.py [-1246pbcnjvlt] <host>
-1, --ssh1 force ssh version 1 only
-2, --ssh2 force ssh version 2 only
-4, --ipv4 enable IPv4 (order of precedence)
-6, --ipv6 enable IPv6 (order of precedence)
-p, --port=<port> port to connect
-b, --batch batch output
-c, --client-audit starts a server on port 2222 to audit client
software config (use -p to change port;
use -t to change timeout)
-n, --no-colors disable colors
-j, --json JSON output
-v, --verbose verbose output
-l, --level=<level> minimum output level (info|warn|fail)
-t, --timeout=<secs> timeout (in seconds) for connection and reading
(default: 5)
- if both IPv4 and IPv6 are used, order of precedence can be set by using either
-46
or-64
. - batch flag
-b
will output sections without header and without empty lines (implies verbose flag). - verbose flag
-v
will prefix each line with section type and algorithm name.
Server Audit Example
Below is a screen shot of the server-auditing output when connecting to an unhardened OpenSSH v5.3 service:
Client Audit Example
Below is a screen shot of the client-auditing output when an unhardened OpenSSH v7.2 client connects:
Hardening Guides
Guides to harden server & client configuration can be found here: https://www.ssh-audit.com/hardening_guides.html
Pre-Built Packages
Pre-built packages are available for Windows (see the releases page), on PyPI, as well as the snap repository.
To install from PyPI:
$ pip3 install ssh-audit
To install the snap package:
$ snap install ssh-audit
To install on Homebrew:
$ brew install ssh-audit
ChangeLog
v2.2.1-dev (???)
- Suppress recommendation of token host key types.
- Added 1 new host key types:
ssh-rsa1
. - Added 1 new ciphers:
blowfish
,AEAD_AES_128_GCM
,AEAD_AES_256_GCM
. - Added 2 new MACs:
chacha20-poly1305@openssh.com
,hmac-sha3-224
.
v2.2.0 (2020-03-11)
- Marked host key type
ssh-rsa
as weak due to practical SHA-1 collisions. - Added Windows builds.
- Added 10 new host key types:
ecdsa-sha2-1.3.132.0.10
,x509v3-sign-dss
,x509v3-sign-rsa
,x509v3-sign-rsa-sha256@ssh.com
,x509v3-ssh-dss
,x509v3-ssh-rsa
,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com
,sk-ecdsa-sha2-nistp256@openssh.com
,sk-ssh-ed25519-cert-v01@openssh.com
, andsk-ssh-ed25519@openssh.com
. - Added 18 new key exchanges:
diffie-hellman-group14-sha256@ssh.com
,diffie-hellman-group15-sha256@ssh.com
,diffie-hellman-group15-sha384@ssh.com
,diffie-hellman-group16-sha384@ssh.com
,diffie-hellman-group16-sha512@ssh.com
,diffie-hellman-group18-sha512@ssh.com
,ecdh-sha2-curve25519
,ecdh-sha2-nistb233
,ecdh-sha2-nistb409
,ecdh-sha2-nistk163
,ecdh-sha2-nistk233
,ecdh-sha2-nistk283
,ecdh-sha2-nistk409
,ecdh-sha2-nistp192
,ecdh-sha2-nistp224
,ecdh-sha2-nistt571
,gss-gex-sha1-
, andgss-group1-sha1-
. - Added 9 new ciphers:
camellia128-cbc
,camellia128-ctr
,camellia192-cbc
,camellia192-ctr
,camellia256-cbc
,camellia256-ctr
,aes128-gcm
,aes256-gcm
, andchacha20-poly1305
. - Added 2 new MACs:
aes128-gcm
andaes256-gcm
.
v2.1.1 (2019-11-26)
- Added 2 new host key types:
rsa-sha2-256-cert-v01@openssh.com
,rsa-sha2-512-cert-v01@openssh.com
. - Added 2 new ciphers:
des
,3des
. - Added 3 new PuTTY vulnerabilities.
- During client testing, client IP address is now listed in output.
v2.1.0 (2019-11-14)
- Added client software auditing functionality (see
-c
/--client-audit
option). - Added JSON output option (see
-j
/--json
option; credit Andreas Jaggi). - Fixed crash while scanning Solaris Sun_SSH.
- Added 9 new key exchanges:
gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==
,gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==
,gss-group14-sha1-
,gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==
,gss-group14-sha256-toWM5Slw5Ew8Mqkay+al2g==
,gss-group15-sha512-toWM5Slw5Ew8Mqkay+al2g==
,diffie-hellman-group15-sha256
,ecdh-sha2-1.3.132.0.10
,curve448-sha512
. - Added 1 new host key type:
ecdsa-sha2-1.3.132.0.10
. - Added 4 new ciphers:
idea-cbc
,serpent128-cbc
,serpent192-cbc
,serpent256-cbc
. - Added 6 new MACs:
hmac-sha2-256-96-etm@openssh.com
,hmac-sha2-512-96-etm@openssh.com
,hmac-ripemd
,hmac-sha256-96@ssh.com
,umac-32@openssh.com
,umac-96@openssh.com
.
v2.0.0 (2019-08-29)
- Forked from https://github.com/arthepsy/ssh-audit (development was stalled, and developer went MIA).
- Added RSA host key length test.
- Added RSA certificate key length test.
- Added Diffie-Hellman modulus size test.
- Now outputs host key fingerprints for RSA and ED25519.
- Added 5 new key exchanges:
sntrup4591761x25519-sha512@tinyssh.org
,diffie-hellman-group-exchange-sha256@ssh.com
,diffie-hellman-group-exchange-sha512@ssh.com
,diffie-hellman-group16-sha256
,diffie-hellman-group17-sha512
. - Added 3 new encryption algorithms:
des-cbc-ssh1
,blowfish-ctr
,twofish-ctr
. - Added 10 new MACs:
hmac-sha2-56
,hmac-sha2-224
,hmac-sha2-384
,hmac-sha3-256
,hmac-sha3-384
,hmac-sha3-512
,hmac-sha256
,hmac-sha256@ssh.com
,hmac-sha512
,hmac-512@ssh.com
. - Added command line argument (
-t
/--timeout
) for connection & reading timeouts. - Updated CVEs for libssh & Dropbear.
v1.7.0 (2016-10-26)
- implement options to allow specify IPv4/IPv6 usage and order of precedence
- implement option to specify remote port (old behavior kept for compatibility)
- add colors support for Microsoft Windows via optional colorama dependency
- fix encoding and decoding issues, add tests, do not crash on encoding errors
- use mypy-lang for static type checking and verify all code
v1.6.0 (2016-10-14)
- implement algorithm recommendations section (based on recognized software)
- implement full libssh support (version history, algorithms, security, etc)
- fix SSH-1.99 banner recognition and version comparison functionality
- do not output empty algorithms (happens for misconfigured servers)
- make consistent output for Python 3.x versions
- add a lot more tests (conf, banner, software, SSH1/SSH2, output, etc)
- use Travis CI to test for multiple Python versions (2.6-3.5, pypy, pypy3)
v1.5.0 (2016-09-20)
- create security section for related security information
- match and output assigned CVE list and security issues for Dropbear SSH
- implement full SSH1 support with fingerprint information
- automatically fallback to SSH1 on protocol mismatch
- add new options to force SSH1 or SSH2 (both allowed by default)
- parse banner information and convert it to specific software and OS version
- do not use padding in batch mode
- several fixes (Cisco sshd, rare hangs, error handling, etc)
v1.0.20160902
- implement batch output option
- implement minimum output level option
- fix compatibility with Python 2.6
v1.0.20160812
- implement SSH version compatibility feature
- fix wrong mac algorithm warning
- fix Dropbear SSH version typo
- parse pre-banner header
- better errors handling
v1.0.20160803
- use OpenSSH 7.3 banner
- add new key-exchange algorithms
v1.0.20160207
- use OpenSSH 7.2 banner
- additional warnings for OpenSSH 7.2
- fix OpenSSH 7.0 failure messages
- add rijndael-cbc failure message from OpenSSH 6.7
v1.0.20160105
- multiple additional warnings
- support for none algorithm
- better compression handling
- ensure reading enough data (fixes few Linux SSH)
v1.0.20151230
- Dropbear SSH support
v1.0.20151223
- initial version