Thx for all this clarification.
For example, how will the user configure the list of available
PSKs?
Regarding PSK API from other libraries :
AdvancedPskStore from Scandium 3.x which is not so straight
forward to use mainly because it supports async request :
https://github.com/eclipse-californium/californium/blob/3.11.0/scandium-core/src/main/java/org/eclipse/californium/scandium/dtls/pskstore/AdvancedPskStore.java
PskStore from Scandium 2.x is more simple to understand but no
async way to request PSK :
https://github.com/eclipse-californium/californium/blob/2.8.0/scandium-core/src/main/java/org/eclipse/californium/scandium/dtls/pskstore/PskStore.java
PSKKeyManager from Concrypt is a more JSSE oriented API (no async
too). I also understand that this API is available when coding for
Android but I think there is a drawback a client is not able to
select Identity based on InetSocketAddress of destination.
-
https://android.googlesource.com/platform/frameworks/base/+/ba12af5/core/java/android/net/PskKeyManager.java
-
https://github.com/google/conscrypt/blob/2.5.2/common/src/main/java/org/conscrypt/PSKKeyManager.java
Note that this class is deprecated in concrypt : I tried to get
more about this : https://github.com/google/conscrypt/issues/1197
TlsPSKIdentityManager is very simple and very limited API from
Bouncy Castle :
https://github.com/bcgit/bc-java/blob/1.72/tls/src/main/java/org/bouncycastle/tls/TlsPSKIdentityManager.java
Note that most of them would probably have been thought with
(D)TLS 1.2 in mind. I don't know if this is adapted for (D)TLS 1.3.
Well, for AES-CCM a pull request would have been nice :)
I'm not so familiar with JSSE API/SunJSSE provider design for now.
Do you think AES-CCM is a good candidate to start ?
I guess if I want to try to help on this, I need to have a look at
: https://openjdk.org/guide/ (and also Contribution agreement)
Oh and working on JSSE when it's time to build/running tests is
there a more simple way than building/testing whole JDK ?
Simon
Le 15/03/2024 à 13:16, Daniel Jeliński a écrit :
Hi Simon,
Yes, the cipher suites in CipherSuite class are available in both TLS
and DTLS by default. TLS 1.3 uses different cipher suites from TLS
1.2, so both protocols need to be updated.
Regarding backporting to other versions of Java, backports are
reviewed on a case-by-case basis. TLS changes are usually backported,
but that's not a given.
RPK is not implemented either; we have a declaration for the relevant
handshake extensions here:
https://github.com/openjdk/jdk/blob/80ccc989a892e4d9f4e2c9395a100cfabbdcda64/src/java.base/share/classes/sun/security/ssl/SSLExtension.java#L239-L240,
but the producers and consumers aren't defined.
Which kind of help do you need 🙂 ?
Well, for AES-CCM a pull request would have been nice :)
For the other topics, I think we'd need to agree on the scope of the
API changes needed. For example, how will the user configure the list
of available PSKs? Will we need an API change? If not, which of the
available APIs will we use to configure the keys?
Cheers,
Daniel
pt., 15 mar 2024 o 11:58 Simon Bernard <cont...@simonbernard.eu>
napisał(a):
Hi Daniel,
Thx for quick answer.
For PSK and AES, if this is added then this will be also for TLS ?
(not only DTLS right ?) and for version 1.2 and 1.3 ? and also
when this feature will be added, would they be available on next
JDK version OR also old version ? (e.g. I know some recent
security feature was backported in java8)
Today, I was looking at Raw Public Key support (RPK) and I
understand this is not supported too. Am I right ?
RPK is also part of LWM2M specification and also refered in
(RFC7925§Section4.3 - TLS / DTLS -Profiles for the Internet of
Things) :
"The use of raw public keys with TLS/DTLS, as defined in
[RFC7250], is the first entry point into public key cryptography
without having to pay the price of certificates and a public key
infrastructure (PKI)."
Help is welcome.
Which kind of help do you need 🙂 ?
Simon
Le 15/03/2024 à 11:38, Daniel Jeliński a écrit :
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 <cont...@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
