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Check CSP components before rendering, prevent format string traversal

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This commit is contained in:
Mira Weller
2026-07-03 10:26:23 +02:00
committed by Raphael Michel
parent a8997f8971
commit d30bca50f7
2 changed files with 80 additions and 13 deletions
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src/tests/base/test_middleware.py
+44
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@@ -126,3 +126,47 @@ class LocaleDeterminationTest(TestCase):
response = c.get('/dummy/dummy/')
language = response['Content-Language']
self.assertEqual(language, 'en')
def test_render_csp():
from pretix.base.middleware import _render_csp
assert _render_csp({}) == ""
assert _render_csp({'default-src': ["'self'"]}) == "default-src 'self'"
h = {
'default-src': ["'self'"],
'script-src': ["'self'"],
'object-src': ["'none'"],
'frame-src': ["'self'"],
'style-src': ["'self'", "'self'"],
'connect-src': ["'self'", "'self'"],
'img-src': ["'self'", "'self'", "data:"],
'font-src': ["'self'"],
'media-src': ["'self'", "data:"],
'form-action': ["'self'", "https:"],
}
assert _render_csp(h) == (
"default-src 'self'; script-src 'self'; object-src 'none'; frame-src 'self'; style-src 'self' 'self'; "
"connect-src 'self' 'self'; img-src 'self' 'self' data:; font-src 'self'; media-src 'self' data:; form-action 'self' https:"
)
def test_merge_csp():
from pretix.base.middleware import _parse_csp, _merge_csp, _render_csp
h = {
'default-src': ["'self'"],
'script-src': ["'self'"],
'style-src': ["'self'", "'self'"],
'form-action': ["'self'", "https:"],
'connect-src': ["'self'", "'self'"],
}
assert _render_csp(h) == (
"default-src 'self'; script-src 'self'; style-src 'self' 'self'; form-action 'self' https:; connect-src 'self' 'self'"
)
_merge_csp(h, _parse_csp("style-src 'unsafe-inline'; connect-src https://example.com"))
assert _render_csp(h) == (
"default-src 'self'; script-src 'self'; style-src 'self' 'self' 'unsafe-inline'; form-action 'self' https:; connect-src 'self' 'self' https://example.com"
)