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  1. HttpComponents HttpClient
  2. HTTPCLIENT-1802

RFC violations in hostname checking

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    Description

      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

      Credit:
      Suphannee Sivakorn
      George Argyros
      Kexin Pei
      Prof. Suman Jana

      Attachments

        1. 1_1_1_1.pem
          1.0 kB
          Suphannee Sivakorn
        2. s_google_com.pem
          1.0 kB
          Suphannee Sivakorn

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            olegk Oleg Kalnichevski
            SSivakorn Suphannee Sivakorn
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              Created:
              Updated:
              Resolved: