ssh-audit/README.md

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# ssh-audit
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[![License](https://img.shields.io/badge/license-MIT-brightgreen.svg)](https://github.com/jtesta/ssh-audit/blob/master/LICENSE)
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[![Docker Pulls](https://img.shields.io/docker/pulls/positronsecurity/ssh-audit)](https://hub.docker.com/r/positronsecurity/ssh-audit)
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[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](https://github.com/jtesta/ssh-audit/blob/master/CONTRIBUTING.md)
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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);
- analyze SSH version compatibility based on algorithm information;
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- historical information from OpenSSH, Dropbear SSH and libssh;
- policy scans to ensure adherence to a hardened/standard configuration;
- runs on Linux and Windows;
- supports Python 3.7 - 3.10;
- no dependencies
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## Usage
```
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
-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
software config (use -p to change port;
use -t to change timeout)
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-d, --debug Enable debug output.
-g, --gex-test=<x[,y,...]> dh gex modulus size test
<min1:pref1:max1[,min2:pref2:max2,...]>
<x-y[:step]>
-j, --json JSON output (use -jj to enable indents)
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-l, --level=<level> minimum output level (info|warn|fail)
-L, --list-policies list all the official, built-in policies
--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)
-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
-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)
-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)
-v, --verbose verbose output
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```
* 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.
* 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
```
To run a standard audit against many servers (place targets into servers.txt, one on each line in the format of `HOST[:PORT]`):
```
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`):
```
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`):
```
ssh-audit -L
```
To run a policy audit against a server:
```
ssh-audit -P ["policy name" | path/to/server_policy.txt] targetserver
```
To run a policy audit against a client:
```
ssh-audit -c -P ["policy name" | path/to/client_policy.txt]
```
To run a policy audit against many servers:
```
ssh-audit -T servers.txt -P ["policy name" | path/to/server_policy.txt]
```
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To create a policy based on a target server (which can be manually edited):
```
ssh-audit -M new_policy.txt targetserver
```
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## Screenshots
### 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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![screenshot](https://user-images.githubusercontent.com/2982011/64388792-317e6f80-d00e-11e9-826e-a4934769bb07.png)
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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`):
![screenshot](https://user-images.githubusercontent.com/2982011/94370881-95178700-00c0-11eb-8705-3157a4669dc0.png)
After applying the steps in the hardening guide (see below), the output changes to the following:
![screenshot](https://user-images.githubusercontent.com/2982011/94370873-87620180-00c0-11eb-9a59-469f61a56ce1.png)
### Client Standard Audit Example
Below is a screen shot of the client-auditing output when an unhardened OpenSSH v7.2 client connects:
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![client_screenshot](https://user-images.githubusercontent.com/2982011/68867998-b946c100-06c4-11ea-975f-1f47e4178a74.png)
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## Hardening Guides
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
Pre-built packages are available for Windows (see the releases page), PyPI, Snap, and Docker.
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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
```
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
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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### v2.6.0-dev
- Dropped support for Python 3.6, as it reached EOL at the end of 2021.
- Added Ubuntu Server 22.04 hardening policy.
- Removed experimental warning tag from `sntrup761x25519-sha512@openssh.com`.
- Updated CVE database; credit [Alexandre Zanni](https://github.com/noraj).
- Added `-g` and `--gex-test` for granular GEX modulus size tests; credit [Adam Russell](https://github.com/thecliguy).
2021-10-15 06:19:04 +02:00
- Snap packages now print more user-friendly error messages when permission errors are encountered.
- JSON 'target' field now always includes port number; credit [tomatohater1337](https://github.com/tomatohater1337).
- Added 3 new host keys: `ssh-xmss@openssh.com`, `ssh-xmss-cert-v01@openssh.com`, `webauthn-sk-ecdsa-sha2-nistp256@openssh.com`.
- Added 24 new key exchanges: `ecdh-sha2-1.3.132.0.1`, `ecdh-sha2-1.2.840.10045.3.1.1`, `ecdh-sha2-1.3.132.0.33`, `ecdh-sha2-1.3.132.0.26`, `ecdh-sha2-1.3.132.0.27`, `ecdh-sha2-1.2.840.10045.3.1.7`, `ecdh-sha2-1.3.132.0.16`, `ecdh-sha2-1.3.132.0.34`, `ecdh-sha2-1.3.132.0.36`, `ecdh-sha2-1.3.132.0.37`, `ecdh-sha2-1.3.132.0.35`, `ecdh-sha2-1.3.132.0.38`, `ecdh-sha2-4MHB+NBt3AlaSRQ7MnB4cg==`, `ecdh-sha2-5pPrSUQtIaTjUSt5VZNBjg==`, `ecdh-sha2-VqBg4QRPjxx1EXZdV0GdWQ==`, `ecdh-sha2-zD/b3hu/71952ArpUG4OjQ==`, `ecdh-sha2-qCbG5Cn/jjsZ7nBeR7EnOA==`, `ecdh-sha2-9UzNcgwTlEnSCECZa7V1mw==`, `ecdh-sha2-wiRIU8TKjMZ418sMqlqtvQ==`, `ecdh-sha2-qcFQaMAMGhTziMT0z+Tuzw==`, `ecdh-sha2-m/FtSAmrV4j/Wy6RVUaK7A==`, `ecdh-sha2-D3FefCjYoJ/kfXgAyLddYA==`, `ecdh-sha2-h/SsxnLCtRBh7I9ATyeB3A==`, `ecdh-sha2-mNVwCXAoS1HGmHpLvBC94w==`.
- Added 1 new MAC: `hmac-sha1-96@openssh.com`.
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### v2.5.0 (2021-08-26)
- Fixed crash when running host key tests.
- Handles server connection failures more gracefully.
- Now prints JSON with indents when `-jj` is used (useful for debugging).
- Added MD5 fingerprints to verbose output.
2021-03-02 17:27:40 +01:00
- Added `-d`/`--debug` option for getting debugging output; credit [Adam Russell](https://github.com/thecliguy).
- Updated JSON output to include MD5 fingerprints. Note that this results in a breaking change in the 'fingerprints' dictionary format.
- 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.
- Added 3 new key exchanges: `gss-gex-sha1-eipGX3TCiQSrx573bT1o1Q==`, `gss-group1-sha1-eipGX3TCiQSrx573bT1o1Q==`, and `gss-group14-sha1-eipGX3TCiQSrx573bT1o1Q==`.
- 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).
- Added version check for OpenSSH user enumeration (CVE-2018-15473).
- Added deprecation note to host key types based on SHA-1.
2021-02-02 18:22:50 +01:00
- Added extra warnings for SSHv1.
- Added built-in hardened OpenSSH v8.5 policy.
- Upgraded warnings to failures for host key types based on SHA-1.
- 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.
- Dropped support for Python 3.5 (which reached EOL in Sept. 2020).
- Added 1 new key exchange: `sntrup761x25519-sha512@openssh.com`.
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### v2.3.1 (2020-10-28)
- 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.
- 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).
- Migrated pre-made policies from external files to internal database.
2020-10-16 02:36:08 +02:00
- Split single 3,500 line script into many files (by class).
- Added setup.py support; credit [Ganden Schaffner](https://github.com/gschaffner).
- Added 1 new cipher: `des-cbc@ssh.com`.
### 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/>.
- Created new man page (see `ssh-audit.1` file).
- 1024-bit moduli upgraded from warnings to failures.
- 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).
- Suppress recommendation of token host key types.
- Added check for use-after-free vulnerability in PuTTY v0.73.
- 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-`.
- 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`.
2020-03-11 16:55:14 +01:00
### v2.2.0 (2020-03-11)
- Marked host key type `ssh-rsa` as weak due to [practical SHA-1 collisions](https://eprint.iacr.org/2020/014.pdf).
- 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`, 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-`.
- Added 9 new ciphers: `camellia128-cbc`, `camellia128-ctr`, `camellia192-cbc`, `camellia192-ctr`, `camellia256-cbc`, `camellia256-ctr`, `aes128-gcm`, `aes256-gcm`, and `chacha20-poly1305`.
2020-02-09 00:44:42 +01:00
- Added 2 new MACs: `aes128-gcm` and `aes256-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.
2019-11-14 17:07:16 +01:00
### v2.1.0 (2019-11-14)
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- Added client software auditing functionality (see `-c` / `--client-audit` option).
- 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 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`.
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### 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.
- 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`.
- 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.
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)
- 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)
- 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
- 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
### 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
2016-03-07 12:01:57 +01:00
- 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
- better compression handling
- ensure reading enough data (fixes few Linux SSH)
2016-01-05 13:14:50 +01:00
2015-12-30 12:17:58 +01:00
### v1.0.20151230
- Dropbear SSH support
2015-12-30 12:17:58 +01:00
2015-12-23 04:52:21 +01:00
### v1.0.20151223
- initial version