『ssh_scan』でリモートサーバのsshdの状態をスキャンする

調べ物中、リモートサーバのsshdの設定情報をスキャンする『ssh_scan』なるツールについて見かけたので、試してみることにした。
以下のコマンドでインストールできる。

sudo gem install ssh_scan

 

オプション等はこんな感じ。

blacknon@BS-PUB-DEVELOP:~$ sudo ssh_scan --help
ssh_scan v0.0.19 (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
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とりあえず、以下のように「-t」オプションを付与してスキャン対象のIPアドレスやホスト名を指定してコマンドを実行してやれば、sshの設定についてスキャンを実施できる。
スキャン結果は、以下のようにJSON形式で返ってくる。

sudo ssh_scan -t IPアドレス
blacknon@BS-PUB-DEVELOP:~$ sudo ssh_scan -t 172.20.XXX.XXX
[sudo] blacknon のパスワード:
I, [2017-04-21T07:50:42.069285 #31650]  INFO -- : You're using the latest version of ssh_scan 0.0.19
[
  {
    "ssh_scan_version": "0.0.19",
    "ip": "172.20.XXX.XXX",
    "port": 22,
    "server_banner": "SSH-2.0-OpenSSH_6.6.1",
    "ssh_version": 2.0,
    "os": "unknown",
    "os_cpe": "o:unknown",
    "ssh_lib": "openssh",
    "ssh_lib_cpe": "a:openssh:openssh:6.6.1",
    "cookie": "855e7a15ae96eb8f7f2c50b2aa1ba980",
    "key_algorithms": [
      "curve25519-sha256@libssh.org",
      "ecdh-sha2-nistp256",
      "ecdh-sha2-nistp384",
      "ecdh-sha2-nistp521",
      "diffie-hellman-group-exchange-sha256",
      "diffie-hellman-group-exchange-sha1",
      "diffie-hellman-group14-sha1",
      "diffie-hellman-group1-sha1"
    ],
    "server_host_key_algorithms": [
      "ssh-rsa",
      "ecdsa-sha2-nistp256",
      "ssh-ed25519"
    ],
    "encryption_algorithms_client_to_server": [
      "aes128-ctr",
      "aes192-ctr",
      "aes256-ctr",
      "arcfour256",
      "arcfour128",
      "aes128-gcm@openssh.com",
      "aes256-gcm@openssh.com",
      "chacha20-poly1305@openssh.com",
      "aes128-cbc",
      "3des-cbc",
      "blowfish-cbc",
      "cast128-cbc",
      "aes192-cbc",
      "aes256-cbc",
      "arcfour",
      "rijndael-cbc@lysator.liu.se"
    ],
    "encryption_algorithms_server_to_client": [
      "aes128-ctr",
      "aes192-ctr",
      "aes256-ctr",
      "arcfour256",
      "arcfour128",
      "aes128-gcm@openssh.com",
      "aes256-gcm@openssh.com",
      "chacha20-poly1305@openssh.com",
      "aes128-cbc",
      "3des-cbc",
      "blowfish-cbc",
      "cast128-cbc",
      "aes192-cbc",
      "aes256-cbc",
      "arcfour",
      "rijndael-cbc@lysator.liu.se"
    ],
    "mac_algorithms_client_to_server": [
      "hmac-md5-etm@openssh.com",
      "hmac-sha1-etm@openssh.com",
      "umac-64-etm@openssh.com",
      "umac-128-etm@openssh.com",
      "hmac-sha2-256-etm@openssh.com",
      "hmac-sha2-512-etm@openssh.com",
      "hmac-ripemd160-etm@openssh.com",
      "hmac-sha1-96-etm@openssh.com",
      "hmac-md5-96-etm@openssh.com",
      "hmac-md5",
      "hmac-sha1",
      "umac-64@openssh.com",
      "umac-128@openssh.com",
      "hmac-sha2-256",
      "hmac-sha2-512",
      "hmac-ripemd160",
      "hmac-ripemd160@openssh.com",
      "hmac-sha1-96",
      "hmac-md5-96"
    ],
    "mac_algorithms_server_to_client": [
      "hmac-md5-etm@openssh.com",
      "hmac-sha1-etm@openssh.com",
      "umac-64-etm@openssh.com",
      "umac-128-etm@openssh.com",
      "hmac-sha2-256-etm@openssh.com",
      "hmac-sha2-512-etm@openssh.com",
      "hmac-ripemd160-etm@openssh.com",
      "hmac-sha1-96-etm@openssh.com",
      "hmac-md5-96-etm@openssh.com",
      "hmac-md5",
      "hmac-sha1",
      "umac-64@openssh.com",
      "umac-128@openssh.com",
      "hmac-sha2-256",
      "hmac-sha2-512",
      "hmac-ripemd160",
      "hmac-ripemd160@openssh.com",
      "hmac-sha1-96",
      "hmac-md5-96"
    ],
    "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": "",
    "auth_methods": [
      "publickey",
      "gssapi-keyex",
      "gssapi-with-mic",
      "password"
    ],
    "fingerprints": {
      "rsa": {
        "known_bad": "false",
        "md5": "bd:63:c3:f3:df:6e:fc:e7:cf:d9:ef:d7:92:98:a0:06",
        "sha1": "4c:49:90:17:68:3a:ac:3a:55:d2:8a:66:98:7a:bc:31:76:60:20:d2",
        "sha256": "21:8e:20:74:57:f9:e2:76:b7:43:69:e5:81:55:04:33:40:58:81:be:ce:04:77:b1:97:b3:7f:c5:3c:25:2d:3a"
      }
    },
    "start_time": "2017-04-21 07:50:42 +0900",
    "end_time": "2017-04-21 07:50:42 +0900",
    "scan_duration_seconds": 0.192282261,
    "duplicate_host_key_ips": [

    ],
    "compliance": {
      "policy": "Mozilla Modern",
      "compliant": false,
      "recommendations": [
        "Remove these Key Exchange Algos: diffie-hellman-group-exchange-sha1, diffie-hellman-group14-sha1, diffie-hellman-group1-sha1",
        "Remove these MAC Algos: hmac-md5-etm@openssh.com, hmac-sha1-etm@openssh.com, umac-64-etm@openssh.com, hmac-ripemd160-etm@openssh.com, hmac-sha1-96-etm@openssh.com, hmac-md5-96-etm@openssh.com, hmac-md5, hmac-sha1, umac-64@openssh.com, hmac-ripemd160, hmac-ripemd160@openssh.com, hmac-sha1-96, hmac-md5-96",
        "Remove these Encryption Ciphers: arcfour256, arcfour128, aes128-cbc, 3des-cbc, blowfish-cbc, cast128-cbc, aes192-cbc, aes256-cbc, arcfour, rijndael-cbc@lysator.liu.se",
        "Remove these Authentication Methods: gssapi-keyex, gssapi-with-mic, password"
      ],
      "references": [
        "https://wiki.mozilla.org/Security/Guidelines/OpenSSH"
      ]
    }
  }
]

 


Written by blacknon

インフラエンジニア(…のつもり)。 仕事で使うならクライアントはWindowsよりはUNIXの方が好き。 大体いつも眠い。

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