Certificate validation issue

[avzuquete]

Hi, I'm using certvalidator 0.11.1 to validate a certificate with a chain.

The validation fails in method verify_crl, with the following traceback:

File "/usr/local/lib/python3.8/site-packages/certvalidator/init.py", line 193, in validate_usage
self._validate_path()
File "/usr/local/lib/python3.8/site-packages/certvalidator/init.py", line 121, in _validate_path
validate_path(self._context, candidate_path)
File "/usr/local/lib/python3.8/site-packages/certvalidator/validate.py", line 50, in validate_path
return _validate_path(validation_context, path)
File "/usr/local/lib/python3.8/site-packages/certvalidator/validate.py", line 402, in _validate_path
verify_crl(
File "/usr/local/lib/python3.8/site-packages/certvalidator/validate.py", line 1243, in verify_crl
if isinstance(distribution_point['crl_issuer'], x509.GeneralNames):
TypeError: string indices must be integers

Apparently one is trying to index a string with a string ...

Attached goes a series of test certificates with a target certificate (sig.der) and its certification chain. I got the error when checking the validity of sig.der.
sig.zip

[avzuquete]

Certificates in DER and PEM formats.
And the correct chain, this time (there was a wrong certtificate in the previous ZIP).
sig.zip

[avzuquete]

Certificates inline, in PEM format. Leaf first, root last, others following chain.

-----BEGIN CERTIFICATE-----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rsWQF1ZPG+yfFhwvur0Qhacn1tt7GRUmwnwJxkFb/0KO1bYYaNGV61W+f6coUyD4
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIHxzCCBa+gAwIBAgIIImjMrnKMozkwDQYJKoZIhvcNAQELBQAwgYQxCzAJBgNV
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIGuTCCBKGgAwIBAgIQMOKuZfn7OuJedMSBZDJHMzANBgkqhkiG9w0BAQsFADBi
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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lw==
-----END CERTIFICATE-----

[3lixy]

TypeError: string indices must be integers is fixed in #28