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51 lines
1.3 KiB
Python
51 lines
1.3 KiB
Python
from flask import Flask, request, redirect
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from urllib.parse import urlparse
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app = Flask(__name__)
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@app.route('/some/path/bad1')
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def unsafe1(request):
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target = request.args.get('target', '')
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if "example.com" in target:
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return redirect(target)
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@app.route('/some/path/bad2')
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def unsafe2(request):
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target = request.args.get('target', '')
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if target.endswith("example.com"):
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return redirect(target)
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#Simplest and safest approach is to use an allowlist
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@app.route('/some/path/good1')
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def safe1(request):
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allowlist = [
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"example.com/home",
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"example.com/login",
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]
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target = request.args.get('target', '')
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if target in allowlist:
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return redirect(target)
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#More complex example allowing sub-domains.
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@app.route('/some/path/good2')
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def safe2(request):
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target = request.args.get('target', '')
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host = urlparse(target).hostname
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#Note the '.' preceding example.com
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if host and host.endswith(".example.com"):
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return redirect(target)
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@app.route('/some/path/good3')
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def safe3(request):
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target = request.args.get('target', '')
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target = urlparse(target)
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#Start url with https:// and ends with a / so must match the correct domain.
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if target and target.startswith("https://example.com/"):
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return redirect(target)
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