Suphannee Sivakorn created HTTPCLIENT-1802:
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Summary: RFC violation in hostname checking
Key: HTTPCLIENT-1802
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1802
Project: HttpComponents HttpClient
Issue Type: Bug
Components: HttpClient (classic)
Affects Versions: 4.5.2
Reporter: Suphannee Sivakorn
Priority: Minor
Attachments: 1_1_1_1.pem, s_google_com.pem
1. Matching commonName in case sensitive manner when wildcard presents
(violation of RFC 6125 and RFC 5280)
HttpClient matches certificate commonName in the case sensitive manner
when there is a wildcard presents in the certificate commonName, for
example, given commonName as "*.google.com", HttpClient matches
"foo.google.com", it however does not match "foo.Google.com". We found
that this behavior is inconsistent with section 6.4.4 of RFC 6125
specification -- "If the client chooses to compare a reference
identifier of type CN-ID against that string, it MUST follow the
comparison rules for the DNS domain name portion of an identifier of
type DNS-ID, SRV-ID, or URI-ID". Note that matching DNS-ID, SRV-ID and
URI-ID all are in case insensitive manner (RFC 5280).
Testing certificate attached: s_google_com.pem
Testing hostname: foo.Google.com
Expected behavior: match
2. Attempting to match commonName when SubjectAltName identifier presents
Section 6.3 of RFC 6125 prohibits clients from attempting to match
certificate CN if the presented identifiers include a DNS-ID, SRV-ID,
URI-ID, or any application-specific identifier types supported by the
client. We found that HttpClient violates this requirement as it
attempts to match CN even when there is a subjectAltName identifier
presents e.g., IP address. However, the library does not attempt to
match certificate CN when certificate subjectAltName DNS presents.
Testing certificate attached: 1_1_1_1.pem
Testing hostname: dummy-value.com
Expected behavior: no match
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