On Wed, Feb 24, 2016, at 15:12, Hans-Christoph Steiner wrote:
> When using NetCipher 1.2's getHttpURLConnection() method to get a nicely
> configured TLS connection, it fails on sites that use SNI HTTPS aliases:
I can reproduce the problem on Android 4.3 through 5.1, but not Android
6.0.
The problem is tied to TlsOnlySocketFactory. This code works fine:
HttpsURLConnection c=
(HttpsURLConnection)new URL(SNI_1_URL).openConnection();
SSLContext ssl=SSLContext.getInstance("TLS");
ssl.init(null, null, null);
c.setSSLSocketFactory(ssl.getSocketFactory());
(here, SNI_1_URL is https://wares.commonsware.com/test.json, a URL on a
server of mine that is equipped with SNI)
By "works fine", the HttpsURLConnection successfully retrieves the JSON.
However, wrapping that in a TlsOnlySocketFactory introduces the problem:
HttpsURLConnection c=
(HttpsURLConnection)new URL(SNI_1_URL).openConnection();
SSLContext ssl=SSLContext.getInstance("TLS");
ssl.init(null, null, null);
c.setSSLSocketFactory(new
TlsOnlySocketFactory(ssl.getSocketFactory(),
true));
Given that the error suggests a problem in hostname validation, the
notes in the JavaDocs for SSLCertificateSocketFactory
(http://developer.android.com/reference/android/net/SSLCertificateSocketFactory.html)
may be relevant:
"Most SSLSocketFactory implementations do not verify the server's
identity, allowing man-in-the-middle attacks. This implementation does
check the server's certificate hostname, but only for createSocket
variants that specify a hostname. When using methods that use
InetAddress or which return an unconnected socket, you MUST verify the
server's identity yourself to ensure a secure connection.
"One way to verify the server's identity is to use
getDefaultHostnameVerifier() to get a HostnameVerifier to verify the
certificate hostname. "
However, I don't know much about the implementation of
TlsOnlySocketFactory and whether those notes are relevant.
--
Mark Murphy (a Commons Guy)
https://commonsware.com | https://github.com/commonsguy
https://commonsware.com/blog | https://twitter.com/commonsguy
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