iDevice GnuTLS issue with iOS 4.2 - libimobiledevice

almogbh almog at
Wed Nov 24 20:59:56 CET 2010


any news/estimations for resolving this issue?
libimobiledevice is the coolest project ever, but i cant conenct my 4.2


Nikias Bassen wrote:
> Hi,
> I'm a leading developer of libimobiledevice (
> and
> we are facing a GnuTLS issue. The lockdown protocol is initializing an
> SSLv3
> session and since iOS 4.2 the handshake fails when using GnuTLS. Further
> investigation showed that the error is GNUTLS_E_FATAL_ALERT_RECEIVED -12,
> Error: Could not negotiate a supported cipher suite.
> However, I replaced the appropiate ssl code using OpenSSL and got it
> working.
> Debugging output showed that the cipher is AES256-SHA, but surprisingly
> this
> is the same cipher that we have with pre-4.2 devices using GnuTLS.
> We have no clue what might be wrong here as it has been working since 4.2b
> arrived, so I'd like to ask if anyone here might be able to help us
> investigating this issue? Tell me what info you need and I'll get it for
> you.
> The device is the server and libimobiledevice code the client side of the
> communication.
> Our code is here:
> The SSL code is in src/idevice.c, the handshake is implemented in 
> idevice_connection_enable_ssl(). If you have questions about the code just
> ask. You can reach us in #libimobiledevice on FreeNode too.
> Regards,
> Nikias
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> Gnutls-devel at

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