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https://issues.apache.org/jira/browse/HTTPCLIENT-2302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17770859#comment-17770859
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Oleg Kalnichevski commented on HTTPCLIENT-2302:
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[~Marcono1234] These examples demonstrate how to use HC APIs to customize
various TLS aspects, not how to verify the hostname of the opposite endpoint.
Feel free to contribute a big "WARNING" as a PR at GitHub. Otherwise I will
close this issue as invalid.
Oleg
> Examples ClientCustomSSL and AsyncClientCustomSSL are misleading and insecure
> -----------------------------------------------------------------------------
>
> Key: HTTPCLIENT-2302
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2302
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Reporter: Marcono1234
> Priority: Major
>
> The examples
> [ClientCustomSSL|https://github.com/apache/httpcomponents-client/blob/rel/v5.2.1/httpclient5/src/test/java/org/apache/hc/client5/http/examples/ClientCustomSSL.java]
> and
> [AsyncClientCustomSSL|https://github.com/apache/httpcomponents-client/blob/rel/v5.2.1/httpclient5/src/test/java/org/apache/hc/client5/http/examples/AsyncClientCustomSSL.java]
> both have a Javadoc comment which says:
> {quote}
> This example demonstrates how to create secure connections with a custom SSL
> context.
> {quote}
> However, this is misleading or even incorrect because the code below does the
> following:
> {code}
> .loadTrustMaterial((chain, authType) -> {
> final X509Certificate cert = chain[0];
> return "CN=httpbin.org".equalsIgnoreCase(cert.getSubjectDN().getName());
> })
> {code}
> This accepts the certificate as long as the subject matches, without properly
> validating it at all, allowing man-in-the-middle attacks.
> This can for example be seen with the various https://badssl.com/ subdomains.
> For example changing in the example the URL to
> https://self-signed.badssl.com/ and changing the expected subject to
> {{"CN=*.badssl.com, O=BadSSL, L=San Francisco, ST=California, C=US"}} still
> successfully creates the connection, even though the certificate is
> self-signed and could have been issued by a malicious actor performing a MITM
> attack.
> Ideally this section with the custom {{TrustStrategy}} should be removed
> because it is not even necessary for this example to work.
> Or if you want to keep this, then there should be a big "WARNING: ..."
> comment in this line. Otherwise users might erroneously think a custom
> {{TrustStrategy}} is needed for TLS to work, or they might just keep this
> example code because their code "works", without understanding the
> consequences of this.
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