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Fixed #615: Nicely reject malformatted http signatures

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This commit is contained in:
Andrew Godwin 2023-07-20 09:55:06 -06:00
parent d6cdcb1d83
commit 1dd076ff7d
2 changed files with 33 additions and 6 deletions
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6
core/signatures.py
View file

@ -103,12 +103,18 @@ class HttpSignature:
name, value = item.split("=", 1) name, value = item.split("=", 1)
value = value.strip('"') value = value.strip('"')
bits[name.lower()] = value bits[name.lower()] = value
try:
signature_details: HttpSignatureDetails = { signature_details: HttpSignatureDetails = {
"headers": bits["headers"].split(), "headers": bits["headers"].split(),
"signature": base64.b64decode(bits["signature"]), "signature": base64.b64decode(bits["signature"]),
"algorithm": bits["algorithm"], "algorithm": bits["algorithm"],
"keyid": bits["keyid"], "keyid": bits["keyid"],
} }
except KeyError as e:
key_names = " ".join(bits.keys())
raise VerificationError(
f"Missing item from details (have: {key_names}, error: {e})"
)
return signature_details return signature_details
@classmethod @classmethod

21
tests/core/test_signatures.py
View file

@ -111,3 +111,24 @@ def test_verify_http(keypair):
) )
# Verify that # Verify that
HttpSignature.verify_request(fake_request, keypair["public_key"], skip_date=True) HttpSignature.verify_request(fake_request, keypair["public_key"], skip_date=True)
def test_verify_http_bad_signature(keypair):
"""
Tests that a signature missing the algorithm does not work
"""
# Make our predictable request
fake_request = RequestFactory().post(
path="/test-actor",
data=b'{"id": "https://example.com/test-create", "type": "Create", "actor": "https://example.com/test-actor", "object": {"id": "https://example.com/test-object", "type": "Note"}}',
content_type="application/json",
HTTP_HOST="example.com",
HTTP_DATE="Sat, 12 Nov 2022 21:57:18 GMT",
HTTP_SIGNATURE='keyId="https://example.com/test-actor#test-key",headers="(request-target) host date digest content-type",signature="IRduYoDJIh90mprjUgOIdxY1iaBWHs5ou9vsDlcmSekg6DXMZTiXjmZxbNIrnpEbNFu3wTcqz1nv9H97Gp7orbYMuHm6j2ecxsvzSr37T9jxBbt3Ov3xSfuYWwhv6PuTWNxHtUQWNuAIc3wHDAQt8Flnak/uHe7swoAq4uHq2kt18iMW6CEV9XA5ESFho2HSUgRaifoNxJlIWbHYPJiP0t9aktgGBkpQoZ8ulOj3Ew4RwC1lwk9kzWiLIjU4tSAie8RbIy2g0aUvA1tQh9Uge1by3o7+349SL5iooj+B6WSCEvvjEl52wo3xoEQmv0ptYuSPLUgB9tP8q7DoHEc8Dw=="',
HTTP_DIGEST="SHA-256=07sIbQ3GlOHWMbFMNajtPNtmUQXXu20UuvrIYLlI3kc=",
)
# Verify that
with pytest.raises(VerificationError):
HttpSignature.verify_request(
fake_request, keypair["public_key"], skip_date=True
)