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25 lines
538 B
Python
25 lines
538 B
Python
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"""Phase 12 — Flask route, benign."""
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import re
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import subprocess
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from flask import Flask, request
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app = Flask(__name__)
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_VALID_HOST = re.compile(r"^[A-Za-z0-9.-]{1,253}$")
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@app.route("/ping", methods=["GET"])
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def ping():
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host = request.args.get("host", "")
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if not _VALID_HOST.fullmatch(host):
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return "invalid host"
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result = subprocess.run(
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["ping", "-c", "1", host],
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shell=False,
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capture_output=True,
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text=True,
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timeout=5,
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)
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return result.stdout + result.stderr
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