wcnnbdk1 translating ssh_scan – Verifies Your SSH Server Configuration and Policy in Linux ============================================================ ssh_scan is an easy-to-use prototype SSH configuration and policy scanner for Linux and UNIX servers, inspired by [Mozilla OpenSSH Security Guide][6], which provides a reasonable baseline policy recommendation for SSH configuration parameters such as Ciphers, MACs, and KexAlgos and much more. It has some of the following benefits: * It has minimal dependencies, ssh_scan only employs native Ruby and BinData to do its work, no heavy dependencies. * It’s portable, you can use ssh_scan in another project or for [automation of tasks][1]. * It’s easy to use, simply point it at an SSH service and get a JSON report of what it supports and it’s policy status. * It’s also configurable, you can create your own custom policies that fit your specific policy requirements. **Suggested Read:** [How to Install and Configure OpenSSH Server in Linux][7] ### How to Install ssh_scan in Linux There are three ways you can install ssh_scan and they are: To install and run as a gem, type: ``` ----------- 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 ``` To run from a [docker container][8], type: ``` # docker pull mozilla/ssh_scan # docker run -it mozilla/ssh_scan /app/bin/ssh_scan -t github.com ``` To install and run from source, type: ``` # 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 ``` ### How to Use ssh_scan in Linux The syntax for using ssh_scan is as follows: ``` $ ssh_scan -t ip-address $ ssh_scan -t server-hostname ``` For example to scan SSH configs and policy of server 92.168.43.198, enter: ``` $ ssh_scan -t 192.168.43.198 ``` Note you can also pass a [IP/Range/Hostname] to the `-t` option as shown in the options below: ``` $ ssh_scan -t 192.168.43.198,200,205 $ ssh_scan -t test.tecmint.lan ``` ##### Sample Output ``` 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": "tecmint", "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" ] } } ] ``` You can use `-p` to specify a different port, `-L` to enable the logger and `-V` to define the verbosity level as shown below: ``` $ ssh_scan -t 192.168.43.198 -p 22222 -L ssh-scan.log -V INFO ``` Additionally, use a custom policy file (default is Mozilla Modern) with the `-P` or `--policy [FILE]` like so: ``` $ ssh_scan -t 192.168.43.198 -L ssh-scan.log -V INFO -P /path/to/custom/policy/file ``` Type this to view all ssh_scan usage options and more examples: ``` $ ssh_scan -h ``` ##### Sample Output ``` 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 ``` Check out some useful artilces on SSH Server: 1. [SSH Passwordless Login Using SSH Keygen in 5 Easy Steps][2] 2. [5 Best Practices to Secure SSH Server][3] 3. [Restrict SSH User Access to Certain Directory Using Chrooted Jail][4] 4. [How to Configure Custom SSH Connections to Simplify Remote Access][5] For more details visit ssh_scan Github repository: [https://github.com/mozilla/ssh_scan][9] In this article, we showed you how to set up and use ssh_scan in Linux. Do you know of any similar tools out there? Let us know via the feedback form below, including any other thoughts concerning this guide. SHARE[+][10][0][11][20][12][25][13] [![Ask Anything](https://www.tecmint.com/wp-content/themes/tecmint/images/help.png)][14] -------------------------------------------------------------------------------- 作者简介： Aaron Kili is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge. ------------------ via: https://www.tecmint.com/ssh_scan-ssh-configuration-and-policy-scanner-for-linux/ 作者：[Aaron Kili ][a] 译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID) 本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 [a]:https://www.tecmint.com/author/aaronkili/ [1]:https://www.tecmint.com/automating-linux-system-administration-tasks/ [2]:https://www.tecmint.com/ssh-passwordless-login-using-ssh-keygen-in-5-easy-steps/ [3]:https://www.tecmint.com/5-best-practices-to-secure-and-protect-ssh-server/ [4]:https://www.tecmint.com/restrict-ssh-user-to-directory-using-chrooted-jail/ [5]:https://www.tecmint.com/configure-custom-ssh-connection-in-linux/ [6]:https://wiki.mozilla.org/Security/Guidelines/OpenSSH [7]:https://www.tecmint.com/install-openssh-server-in-linux/ [8]:https://www.tecmint.com/install-docker-and-learn-containers-in-centos-rhel-7-6/ [9]:https://github.com/mozilla/ssh_scan [10]:https://www.tecmint.com/ssh_scan-ssh-configuration-and-policy-scanner-for-linux/# [11]:https://www.tecmint.com/ssh_scan-ssh-configuration-and-policy-scanner-for-linux/# [12]:https://www.tecmint.com/ssh_scan-ssh-configuration-and-policy-scanner-for-linux/# [13]:https://www.tecmint.com/ssh_scan-ssh-configuration-and-policy-scanner-for-linux/# [14]:https://www.tecmint.com/ssh_scan-ssh-configuration-and-policy-scanner-for-linux/#comments [15]:https://www.tecmint.com/author/aaronkili/ [16]:https://www.tecmint.com/10-useful-free-linux-ebooks-for-newbies-and-administrators/ [17]:https://www.tecmint.com/free-linux-shell-scripting-books/