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# ssh-audit
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[](https://travis-ci.org/jtesta/ssh-audit)
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**ssh-audit** is a tool for ssh server & client configuration auditing.
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[jtesta/ssh-audit ](https://github.com/jtesta/ssh-audit/ ) (v2.0+) is the updated and maintained version of ssh-audit forked from [arthepsy/ssh-audit ](https://github.com/arthepsy/ssh-audit ) (v1.x) due to inactivity.
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- [Features ](#features )
- [Usage ](#usage )
- [Screenshots ](#screenshots )
- [Server Standard Audit Example ](#server-standard-audit-example )
- [Server Policy Audit Example ](#server-policy-audit-example )
- [Client Standard Audit Example ](#client-standard-audit-example )
- [Hardening Guides ](#hardening-guides )
- [Pre-Built Packages ](#pre-built-packages )
- [Web Front-End ](#web-front-end )
- [ChangeLog ](#changelog )
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## Features
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- SSH1 and SSH2 protocol server support;
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- analyze SSH client configuration;
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- grab banner, recognize device or software and operating system, detect compression;
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- gather key-exchange, host-key, encryption and message authentication code algorithms;
- output algorithm information (available since, removed/disabled, unsafe/weak/legacy, etc);
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- output algorithm recommendations (append or remove based on recognized software version);
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- output security information (related issues, assigned CVE list, etc);
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- analyze SSH version compatibility based on algorithm information;
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- historical information from OpenSSH, Dropbear SSH and libssh;
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- policy scans to ensure adherence to a hardened/standard configuration;
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- runs on Linux and Windows;
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- supports Python 3.6 - 3.9;
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- no dependencies
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## Usage
```
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usage: ssh-audit.py [options] < host >
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-h, --help print this help
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-1, --ssh1 force ssh version 1 only
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-2, --ssh2 force ssh version 2 only
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-4, --ipv4 enable IPv4 (order of precedence)
-6, --ipv6 enable IPv6 (order of precedence)
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-b, --batch batch output
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-c, --client-audit starts a server on port 2222 to audit client
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software config (use -p to change port;
use -t to change timeout)
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-d, --debug Enable debug output.
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-j, --json JSON output (use -jj to enable indents)
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-l, --level=< level > minimum output level (info|warn|fail)
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-L, --list-policies list all the official, built-in policies
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--lookup=< alg1 , alg2 , . . . > looks up an algorithm(s) without
connecting to a server
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-m, --manual print the man page (Windows only)
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-M, --make-policy=< policy.txt > creates a policy based on the target server
(i.e.: the target server has the ideal
configuration that other servers should
adhere to)
-n, --no-colors disable colors
-p, --port=< port > port to connect
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-P, --policy=< "policy name" | policy.txt> run a policy test using the
specified policy
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-t, --timeout=< secs > timeout (in seconds) for connection and reading
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(default: 5)
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-T, --targets=< hosts.txt > a file containing a list of target hosts (one
per line, format HOST[:PORT])
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--threads=< threads > number of threads to use when scanning multiple
targets (-T/--targets) (default: 32)
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-v, --verbose verbose output
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```
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* if both IPv4 and IPv6 are used, order of precedence can be set by using either `-46` or `-64` .
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* 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.
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* an exit code of 0 is returned when all algorithms are considered secure (for a standard audit), or when a policy check passes (for a policy audit).
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Basic server auditing:
```
ssh-audit localhost
ssh-audit 127.0.0.1
ssh-audit 127.0.0.1:222
ssh-audit ::1
ssh-audit [::1]:222
```
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To run a standard audit against many servers (place targets into servers.txt, one on each line in the format of `HOST[:PORT]` ):
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```
ssh-audit -T servers.txt
```
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To audit a client configuration (listens on port 2222 by default; connect using `ssh -p 2222 anything@localhost` ):
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```
ssh-audit -c
```
To audit a client configuration, with a listener on port 4567:
```
ssh-audit -c -p 4567
```
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To list all official built-in policies (hint: use resulting policy names with `-P` /`--policy`):
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```
ssh-audit -L
```
To run a policy audit against a server:
```
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ssh-audit -P ["policy name" | path/to/server_policy.txt] targetserver
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```
To run a policy audit against a client:
```
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ssh-audit -c -P ["policy name" | path/to/client_policy.txt]
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```
To run a policy audit against many servers:
```
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ssh-audit -T servers.txt -P ["policy name" | path/to/server_policy.txt]
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```
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To create a policy based on a target server (which can be manually edited):
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```
ssh-audit -M new_policy.txt targetserver
```
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## Screenshots
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### Server Standard Audit Example
Below is a screen shot of the standard server-auditing output when connecting to an unhardened OpenSSH v5.3 service:
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### Server Policy Audit Example
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Below is a screen shot of the policy auditing output when connecting to an un-hardened Ubuntu Server 20.04 machine (hint: use `-L` /`--list-policies` to see names of built-in policies to use with `-P` /`--policy`):
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After applying the steps in the hardening guide (see below), the output changes to the following:
### Client Standard Audit Example
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Below is a screen shot of the client-auditing output when an unhardened OpenSSH v7.2 client connects:
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## Hardening Guides
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Guides to harden server & client configuration can be found here: [https://www.ssh-audit.com/hardening_guides.html ](https://www.ssh-audit.com/hardening_guides.html )
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## Pre-Built Packages
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Pre-built packages are available for Windows (see the releases page), on PyPI, Snap, and Homebrew.
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To install from PyPI:
```
$ pip3 install ssh-audit
```
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To install the Snap package:
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```
$ snap install ssh-audit
```
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To install on Homebrew:
```
$ brew install ssh-audit
```
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To install from Dockerhub:
```
$ docker pull positronsecurity/ssh-audit
```
(Then run with: `docker run -it -p 2222:2222 positronsecurity/ssh-audit 10.1.1.1` )
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## Web Front-End
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For convenience, a web front-end on top of the command-line tool is available at [https://www.ssh-audit.com/ ](https://www.ssh-audit.com/ ).
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## ChangeLog
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### v2.5.0-dev (???)
- Fixed crash when running host key tests.
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- Handles server connection failures more gracefully.
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- Now prints JSON with indents when `-jj` is used (useful for debugging).
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- Added MD5 fingerprints to verbose output.
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- Added `-d` /`--debug` option for getting debugging output; credit [Adam Russell ](https://github.com/thecliguy ).
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- Updated JSON output to include MD5 fingerprints. Note that this results in a breaking change in the 'fingerprints' dictionary format.
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- Updated OpenSSH 8.1 (and earlier) policies to include `rsa-sha2-512` and `rsa-sha2-256` .
2021-08-25 18:30:38 +02:00
- Added OpenSSH v8.6 & v8.7 policies.
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- Added 3 new key exchanges: `gss-gex-sha1-eipGX3TCiQSrx573bT1o1Q==` , `gss-group1-sha1-eipGX3TCiQSrx573bT1o1Q==` , and `gss-group14-sha1-eipGX3TCiQSrx573bT1o1Q==` .
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- Added 3 new MACs: `hmac-ripemd160-96` , `AEAD_AES_128_GCM` , and `AEAD_AES_256_GCM` .
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### v2.4.0 (2021-02-23)
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- Added multi-threaded scanning support.
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- Added built-in Windows manual page (see `-m` /`--manual`); credit [Adam Russell ](https://github.com/thecliguy ).
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- Added version check for OpenSSH user enumeration (CVE-2018-15473).
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- Added deprecation note to host key types based on SHA-1.
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- Added extra warnings for SSHv1.
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- Added built-in hardened OpenSSH v8.5 policy.
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- Upgraded warnings to failures for host key types based on SHA-1.
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- Fixed crash when receiving unexpected response during host key test.
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- Fixed hang against older Cisco devices during host key test & gex test.
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- Fixed improper termination while scanning multiple targets when one target returns an error.
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- Dropped support for Python 3.5 (which reached EOL in Sept. 2020).
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- Added 1 new key exchange: `sntrup761x25519-sha512@openssh.com` .
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### v2.3.1 (2020-10-28)
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- Now parses public key sizes for `rsa-sha2-256-cert-v01@openssh.com` and `rsa-sha2-512-cert-v01@openssh.com` host key types.
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- Flag `ssh-rsa-cert-v01@openssh.com` as a failure due to SHA-1 hash.
- Fixed bug in recommendation output which suppressed some algorithms inappropriately.
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- Built-in policies now include CA key requirements (if certificates are in use).
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- Lookup function (`--lookup`) now performs case-insensitive lookups of similar algorithms; credit [Adam Russell ](https://github.com/thecliguy ).
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- Migrated pre-made policies from external files to internal database.
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- Split single 3,500 line script into many files (by class).
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- Added setup.py support; credit [Ganden Schaffner ](https://github.com/gschaffner ).
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- Added 1 new cipher: `des-cbc@ssh.com` .
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### v2.3.0 (2020-09-27)
- Added new policy auditing functionality to test adherence to a hardening guide/standard configuration (see `-L` /`--list-policies`, `-M` /`--make-policy` and `-P` /`--policy`). For an in-depth tutorial, see < https: // www . positronsecurity . com / blog / 2020-09-27-ssh-policy-configuration-checks-with-ssh-audit /> .
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- Created new man page (see `ssh-audit.1` file).
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- 1024-bit moduli upgraded from warnings to failures.
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- Many Python 2 code clean-ups, testing framework improvements, pylint & flake8 fixes, and mypy type comments; credit [Jürgen Gmach ](https://github.com/jugmac00 ).
- Added feature to look up algorithms in internal database (see `--lookup` ); credit [Adam Russell ](https://github.com/thecliguy ).
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- Suppress recommendation of token host key types.
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- Added check for use-after-free vulnerability in PuTTY v0.73.
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- Added 11 new host key types: `ssh-rsa1` , `ssh-dss-sha256@ssh.com` , `ssh-gost2001` , `ssh-gost2012-256` , `ssh-gost2012-512` , `spki-sign-rsa` , `ssh-ed448` , `x509v3-ecdsa-sha2-nistp256` , `x509v3-ecdsa-sha2-nistp384` , `x509v3-ecdsa-sha2-nistp521` , `x509v3-rsa2048-sha256` .
- Added 8 new key exchanges: `diffie-hellman-group1-sha256` , `kexAlgoCurve25519SHA256` , `Curve25519SHA256` , `gss-group14-sha256-` , `gss-group15-sha512-` , `gss-group16-sha512-` , `gss-nistp256-sha256-` , `gss-curve25519-sha256-` .
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- Added 5 new ciphers: `blowfish` , `AEAD_AES_128_GCM` , `AEAD_AES_256_GCM` , `crypticore128@ssh.com` , `seed-cbc@ssh.com` .
- Added 3 new MACs: `chacha20-poly1305@openssh.com` , `hmac-sha3-224` , `crypticore-mac@ssh.com` .
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### v2.2.0 (2020-03-11)
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- Marked host key type `ssh-rsa` as weak due to [practical SHA-1 collisions ](https://eprint.iacr.org/2020/014.pdf ).
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- Added Windows builds.
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- 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` , and `sk-ssh-ed25519@openssh.com` .
2020-02-09 00:44:42 +01:00
- 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-` , and `gss-group1-sha1-` .
2020-03-11 00:22:15 +01:00
- Added 9 new ciphers: `camellia128-cbc` , `camellia128-ctr` , `camellia192-cbc` , `camellia192-ctr` , `camellia256-cbc` , `camellia256-ctr` , `aes128-gcm` , `aes256-gcm` , and `chacha20-poly1305` .
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- Added 2 new MACs: `aes128-gcm` and `aes256-gcm` .
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### v2.1.1 (2019-11-26)
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- 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` .
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- Added 3 new PuTTY vulnerabilities.
- During client testing, client IP address is now listed in output.
2019-11-14 17:07:16 +01:00
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### v2.1.0 (2019-11-14)
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- Added client software auditing functionality (see `-c` / `--client-audit` option).
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- Added JSON output option (see `-j` / `--json` option; credit [Andreas Jaggi ](https://github.com/x-way )).
2019-09-20 02:10:37 +02:00
- Fixed crash while scanning Solaris Sun_SSH.
Added five kex algorithms: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==, gss-group14-sha1-, gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==, gss-group14-sha256-toWM5Slw5Ew8Mqkay+al2g==, gss-group15-sha512-toWM5Slw5Ew8Mqkay+al2g==; added four ciphers: idea-cbc, serpent128-cbc, serpent192-cbc, serpent256-cbc; added four MACs: hmac-ripemd, hmac-sha256-96@ssh.com, umac-32@openssh.com, umac-96@openssh.com.
2019-10-25 17:27:22 +02:00
- 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` .
2019-09-20 04:19:26 +02:00
- Added 1 new host key type: `ecdsa-sha2-1.3.132.0.10` .
Added five kex algorithms: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==, gss-group14-sha1-, gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==, gss-group14-sha256-toWM5Slw5Ew8Mqkay+al2g==, gss-group15-sha512-toWM5Slw5Ew8Mqkay+al2g==; added four ciphers: idea-cbc, serpent128-cbc, serpent192-cbc, serpent256-cbc; added four MACs: hmac-ripemd, hmac-sha256-96@ssh.com, umac-32@openssh.com, umac-96@openssh.com.
2019-10-25 17:27:22 +02:00
- 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` .
2019-08-29 22:52:38 +02:00
2019-08-29 21:34:19 +02:00
### v2.0.0 (2019-08-29)
2019-08-22 21:49:10 +02:00
- 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.
2019-08-26 21:28:37 +02:00
- 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` .
2019-08-22 21:54:14 +02:00
- Added 3 new encryption algorithms: `des-cbc-ssh1` , `blowfish-ctr` , `twofish-ctr` .
2019-08-26 21:19:49 +02:00
- 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` .
2019-11-14 14:56:14 +01:00
- Added command line argument (`-t` / `--timeout` ) for connection & reading timeouts.
2019-08-22 21:49:10 +02:00
- Updated CVEs for libssh & Dropbear.
2016-10-26 18:02:13 +02:00
### v1.7.0 (2016-10-26)
2016-10-26 17:56:38 +02:00
- 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
2016-10-14 07:55:29 +02:00
### v1.6.0 (2016-10-14)
2016-10-10 13:03:45 +02:00
- 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)
2016-09-20 11:26:14 +02:00
### 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)
2016-10-25 20:52:58 +02:00
- parse banner information and convert it to specific software and OS version
2016-09-20 11:26:14 +02:00
- do not use padding in batch mode
- several fixes (Cisco sshd, rare hangs, error handling, etc)
2016-09-02 17:10:16 +02:00
### v1.0.20160902
- implement batch output option
- implement minimum output level option
- fix compatibility with Python 2.6
2016-08-12 15:29:51 +02:00
### v1.0.20160812
2016-08-12 15:33:34 +02:00
- implement SSH version compatibility feature
2016-08-12 15:29:51 +02:00
- fix wrong mac algorithm warning
- fix Dropbear SSH version typo
- parse pre-banner header
- better errors handling
2016-08-03 16:32:46 +02:00
### v1.0.20160803
- use OpenSSH 7.3 banner
- add new key-exchange algorithms
2016-03-07 12:01:57 +01:00
### 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
2016-01-05 13:14:50 +01:00
### v1.0.20160105
2016-01-05 17:04:49 +01:00
- multiple additional warnings
- support for none algorithm
2016-01-05 13:14:50 +01:00
- better compression handling
- ensure reading enough data (fixes few Linux SSH)
2015-12-30 12:17:58 +01:00
### v1.0.20151230
- Dropbear SSH support
2015-12-23 04:52:21 +01:00
### v1.0.20151223
- initial version
