Key Missing Feature for IoT

[Daniel Jeliński]

Hi Simon, welcome to security-dev!

You got the situation of DTLS right:
- PSK cipher suites were first requested in JDK-6476446, then in JDK-8049402.
- connection identifier is not implemented, and not on the to-do list yet;
- AES-CCM was requested in JDK-8008342, then in JDK-8176395. If I
understand correctly, this one should be relatively easier to
implement, using the implementation of the ChaCha20 cipher as an
example (see JDK-8140466, JDK-8204192).

It makes perfect sense to add these features to the OpenJDK. They were
never high enough on the priority list to get implemented. Help is
welcome.

Cheers,
Daniel


czw., 14 mar 2024 o 17:31 Simon Bernard <contact at simonbernard.eu> napisał(a):
>
> Hi all,
>
> I'm the main Maintainer of Leshan. An open Source Java Implementation of LWM2M protocol.
>
> LWM2M is mainly based on coap and coap+tcp protocol.
> Security is available by usage of coaps and coaps+tcp which are based respectively on DTLS and TLS (mainly v1.2 for now)
>
> Currently we only have support of coap and coaps. We are using Scandium as DTLS implementation, this is an historical choice because DTLS was not available OpenJDK initially.
>
> Recently, I begin to work about adding coap+tcp and coaps+tcp to Leshan and so I looked again on available security feature in OpenJDK to see if I should rely on it but  I understand there still missing key features for IoT.
>
> My understanding, DTLS 1.2 was added but there is still no support of :
>
> Pre-Shared Key for (D)TLS 1.2 :  PSK is one of the most basic techniques for TLS/DTLS since it is both computationally efficient and bandwidth conserving. (RFC7925§Section4.2 - TLS / DTLS -Profiles for the Internet of Things)
> Connection Identifier for DTLS 1.2 (RFC 9146) : CID is key feature to limit handshake in dynamic IP environment. (and also be used for load balancing)
> Cipher suite based on AES_128_CCM_8 (TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8, TLS_PSK_WITH_AES_128_CCM_8) which are the recommended or mandatory ciphersuite for CoAP or to create implementation compliant with RFC7925.
>
> If I missed something and one of those feature is already available let me know.
>
> The point I want to raise here it that it's pretty hard for Java IoT developer to support commons Security IoT Feature.
>
> Community can eventually rely on Scandium but it is currently maintain by only 1 person and doesn't follow JSSE API and only target DTLS.
> Other alternative is maybe Bouncy Castle but Pre-shared key seems not available in their JSSE provider.
> There is also possibility to bind native library but this is not so easy and also have drawback.
> All that solution sounds not so good...
>
> So do you think it could make sense to add this kind of feature in OpenJDK ?
> Or Maybe there is already plan to add it ?
>
> (I hope this is the right place for this kind of question)
>
> Thx,
>
> Simon
>