[gnutls-devel] GnuTLS | GnuTLS rejects a cert since it cannot parse the critical ext Netscape Cert Type (#1170)

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GOODPWDCETCSZ created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1170



## Description of problem:

GnuTLS rejects a cert since it cannot parse the critical ext Netscape Cert Type. OpenSSL, mbedTLS, and WolfSSL accept it.

## Version of gnutls used:

3.5.5, 3.6.13

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)

Ubuntu x64

## How reproducible:

Steps to Reproduce:

 * `certtool --verify --load-ca-certificate ca.pem --infile seed-4s18-107s39-405s19.pem.pem`

## Actual results:
```
certtool --verify --load-ca-certificate ./certs_related/ca.pem --infile ./certs/seed-4s18-107s39-405s19.pem
Note that no verification profile was selected. In the future the medium profile will be enabled by default.
Use --verify-profile low to apply the default verification of NORMAL priority string.
Loaded CAs (1 available)
	Subject: serialNumber=serialNumber2,CN=Susan Housley2,DC=DC2,dnQualifier=dnQ2,OU=network security\, Counter-Terrorism Committee,O=Counter-Terrorism Committee,ST=New York State,C=UN
	Issuer: CN=DT,OU=UNSC,O=UNGA,ST=NYS,C=UN
	Checked against: CN=DT,OU=UNSC,O=UNGA,ST=NYS,C=UN
	Signature algorithm: RSA-SHA256
	Output: Not verified. The certificate is NOT trusted. The certificate contains an unknown critical extension. 

Chain verification output: Not verified. The certificate is NOT trusted. The certificate contains an unknown critical extension. 

```


## Expected results:

Consistent verification results among GnuTLS and other TLS implementations.

## Attachments:

[ca.zip](/uploads/1453fcdb5d86499c85a4e213883a12a1/ca.zip)

[seed-4s18-107s39-405s19.zip](/uploads/d68c8156273f91da86a950ea84aa0a64/seed-4s18-107s39-405s19.zip)

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