ssh_scan - 在Linux中验证您的SSH服务器配置和策略

ssh_scan是用于Linux的易于使用的原型SSH配置和策略扫描程序,它为您的SSH配置参数提供了建议。

ssh_scan是针对Linux和UNIX服务器的易于使用的原型SSH配置和策略扫描器,灵感来自Mozilla OpenSSH安全指南 ,它为SSH配置参数(如密码,MAC和KexAlgos等)提供了合理的基准策略建议。

它具有以下好处:

  • 它具有最小的依赖关系,ssh_scan只使用本机Ruby和BinData来完成工作,没有重要的依赖关系。
  • 它是可移植的,您可以在另一个项目中使用ssh_scan或者用于自动化任务
  • 它很容易使用,只需指出一个SSH服务,并得到一个JSON报告,它支持什么和它的政策状态。
  • 它也是可配置的,您可以创建自己的适合您特定策略要求的自定义策略。

建议阅读: 如何在Linux中安装和配置OpenSSH Server

如何在Linux中安装ssh_scan

有三种方法可以安装ssh_scan ,它们是:

要安装并运行为gem,请键入:

----------- On Debian/Ubuntu ----------- 
$ sudo apt-get install ruby gem
$ sudo gem install ssh_scan
----------- On CentOS/RHEL ----------- 
# yum install ruby rubygem
# gem install ssh_scan

要从码头容器运行,请键入:

# docker pull mozilla/ssh_scan
# docker run -it mozilla/ssh_scan /app/bin/ssh_scan -t github.com

要从源安装和运行,请键入:

# git clone https://github.com/mozilla/ssh_scan.git
# cd ssh_scan
# gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
# curl -sSL https://get.rvm.io | bash -s stable
# rvm install 2.3.1
# rvm use 2.3.1
# gem install bundler
# bundle install
# ./bin/ssh_scan

如何在Linux中使用ssh_scan

使用ssh_scan的语法如下:

$ ssh_scan -t ip-address
$ ssh_scan -t server-hostname

例如,要扫描SSH配置和服务器92.168.43.198的策略,请输入:

$ ssh_scan -t 192.168.43.198

请注意,您还可以将[IP /范围/主机名]传递给-t选项,如以下选项所示:

$ ssh_scan -t 192.168.43.198,200,205
$ ssh_scan -t test.howtoing.lan
样品输出
I, [2017-05-09T10:36:17.913644 #7145]  INFO -- : You're using the latest version of ssh_scan 0.0.19
[
{
"ssh_scan_version": "0.0.19",
"ip": "192.168.43.198",
"port": 22,
"server_banner": "SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.1",
"ssh_version": 2.0,
"os": "ubuntu",
"os_cpe": "o:canonical:ubuntu:16.04",
"ssh_lib": "openssh",
"ssh_lib_cpe": "a:openssh:openssh:7.2p2",
"cookie": "68b17bcca652eeaf153ed18877770a38",
"key_algorithms": [
"curve25519-sha256@libssh.org",
"ecdh-sha2-nistp256",
"ecdh-sha2-nistp384",
"ecdh-sha2-nistp521",
"diffie-hellman-group-exchange-sha256",
"diffie-hellman-group14-sha1"
],
"server_host_key_algorithms": [
"ssh-rsa",
"rsa-sha2-512",
"rsa-sha2-256",
"ecdsa-sha2-nistp256",
"ssh-ed25519"
],
"encryption_algorithms_client_to_server": [
"chacha20-poly1305@openssh.com",
"aes128-ctr",
"aes192-ctr",
"aes256-ctr",
"aes128-gcm@openssh.com",
"aes256-gcm@openssh.com"
],
"encryption_algorithms_server_to_client": [
"chacha20-poly1305@openssh.com",
"aes128-ctr",
"aes192-ctr",
"aes256-ctr",
"aes128-gcm@openssh.com",
"aes256-gcm@openssh.com"
],
"mac_algorithms_client_to_server": [
"umac-64-etm@openssh.com",
"umac-128-etm@openssh.com",
"hmac-sha2-256-etm@openssh.com",
"hmac-sha2-512-etm@openssh.com",
"hmac-sha1-etm@openssh.com",
"umac-64@openssh.com",
"umac-128@openssh.com",
"hmac-sha2-256",
"hmac-sha2-512",
"hmac-sha1"
],
"mac_algorithms_server_to_client": [
"umac-64-etm@openssh.com",
"umac-128-etm@openssh.com",
"hmac-sha2-256-etm@openssh.com",
"hmac-sha2-512-etm@openssh.com",
"hmac-sha1-etm@openssh.com",
"umac-64@openssh.com",
"umac-128@openssh.com",
"hmac-sha2-256",
"hmac-sha2-512",
"hmac-sha1"
],
"compression_algorithms_client_to_server": [
"none",
"zlib@openssh.com"
],
"compression_algorithms_server_to_client": [
"none",
"zlib@openssh.com"
],
"languages_client_to_server": [
],
"languages_server_to_client": [
],
"hostname": "howtoing",
"auth_methods": [
"publickey",
"password"
],
"fingerprints": {
"rsa": {
"known_bad": "false",
"md5": "0e:d0:d7:11:f0:9b:f8:33:9c:ab:26:77:e5:66:9e:f4",
"sha1": "fc:8d:d5:a1:bf:52:48:a6:7e:f9:a6:2f:af:ca:e2:f0:3a:9a:b7:fa",
"sha256": "ff:00:b4:a4:40:05:19:27:7c:33:aa:db:a6:96:32:88:8e:bf:05:a1:81:c0:a4:a8:16:01:01:0b:20:37:81:11"
}
},
"start_time": "2017-05-09 10:36:17 +0300",
"end_time": "2017-05-09 10:36:18 +0300",
"scan_duration_seconds": 0.221573169,
"duplicate_host_key_ips": [
],
"compliance": {
"policy": "Mozilla Modern",
"compliant": false,
"recommendations": [
"Remove these Key Exchange Algos: diffie-hellman-group14-sha1",
"Remove these MAC Algos: umac-64-etm@openssh.com, hmac-sha1-etm@openssh.com, umac-64@openssh.com, hmac-sha1",
"Remove these Authentication Methods: password"
],
"references": [
"https://wiki.mozilla.org/Security/Guidelines/OpenSSH"
]
}
}
]

您可以使用-p指定不同的端口-L来启用记录器, -V可以定义详细级别,如下所示:

$ ssh_scan -t 192.168.43.198 -p 22222 -L ssh-scan.log -V INFO

另外,使用-P--policy [FILE]的自定义策略文件(默认为Mozilla Modern),如下所示:

$ ssh_scan -t 192.168.43.198 -L ssh-scan.log -V INFO -P /path/to/custom/policy/file

键入此以查看所有ssh_scan使用选项和更多示例:

$ ssh_scan -h
样品输出
ssh_scan v0.0.17 (https://github.com/mozilla/ssh_scan)
Usage: ssh_scan [options]
-t, --target [IP/Range/Hostname] IP/Ranges/Hostname to scan
-f, --file [FilePath]            File Path of the file containing IP/Range/Hostnames to scan
-T, --timeout [seconds]          Timeout per connect after which ssh_scan gives up on the host
-L, --logger [Log File Path]     Enable logger
-O, --from_json [FilePath]       File to read JSON output from
-o, --output [FilePath]          File to write JSON output to
-p, --port [PORT]                Port (Default: 22)
-P, --policy [FILE]              Custom policy file (Default: Mozilla Modern)
--threads [NUMBER]           Number of worker threads (Default: 5)
--fingerprint-db [FILE]      File location of fingerprint database (Default: ./fingerprints.db)
--suppress-update-status     Do not check for updates
-u, --unit-test [FILE]           Throw appropriate exit codes based on compliance status
-V [STD_LOGGING_LEVEL],
--verbosity
-v, --version                    Display just version info
-h, --help                       Show this message
Examples:
ssh_scan -t 192.168.1.1
ssh_scan -t server.example.com
ssh_scan -t ::1
ssh_scan -t ::1 -T 5
ssh_scan -f hosts.txt
ssh_scan -o output.json
ssh_scan -O output.json -o rescan_output.json
ssh_scan -t 192.168.1.1 -p 22222
ssh_scan -t 192.168.1.1 -p 22222 -L output.log -V INFO
ssh_scan -t 192.168.1.1 -P custom_policy.yml
ssh_scan -t 192.168.1.1 --unit-test -P custom_policy.yml

查看SSH服务器上的一些有用的功能:

  1. SSH密码登录使用SSH Keygen在5个简单的步骤
  2. 5安全SSH服务器的最佳实践
  3. 使用Chrooted Jail限制SSH用户访问某些目录
  4. 如何配置自定义SSH连接以简化远程访问

有关更多详细信息,请访问ssh_scan Github仓库: https//github.com/mozilla/ssh_scan

在本文中,我们向您展示了如何在Linux中设置和使用ssh_scan。 你知道任何类似的工具吗? 通过下面的反馈表,让我们知道,包括有关本指南的任何其他想法。