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Is there a way when using Ktor embedded server with Netty to block use of TLS 1.0 and 1.1?
# ktor
j
Is there a way when using Ktor embedded server with Netty to block use of TLS 1.0 and 1.1?
I see suggestions like following but not sure if/how that can be done when using Ktor/Netty https://stackoverflow.com/questions/65680170/how-to-exclude-weak-protocols-ciphers-suits-from-the-netty-sslcontext
I think I can get access to 
connector
and extract some of the code in 
NettyChannelInitializer
for example.....
(btw still have to use 1.6.x here....and running on Android fwiw)
I built ktor locally here and included following in 
NettyChannelInitializer
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protocols("TLSv1.3", "TLSv1.2")
but for some reason following still working
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openssl s_client -connect <ip address>:443 -tls1
ah, it did actually work....I had initially put that 
protocols
call inside the 
if (alpnProvider != null)
block but that is actually null!
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sslContext = SslContextBuilder.forServer(pk, *certs).apply {
    protocols("TLSv1.3", "TLSv1.2")
    if (alpnProvider != null) {
        sslProvider(alpnProvider)
Just need to see now if there's any way to set this without custom build of ktor
@Aleksei Tirman [JB] just in case you might know if this is possible....or would it be worth creating PR to allow this to be customised?
a
Unfortunately, I didn’t find an extension point to do it. You can file a feature request to address this problem.
j
ok, have created that (https://youtrack.jetbrains.com/issue/KTOR-4587/Way-to-block-use-of-TLS-1011-when-using-KtorNetty) - let me know if any more info needed....or, as mentioned, if worth me trying to create PR to address this
I've created fork/branch off 1.6.3 (version we're currently on) that has the TLS fix. If I run 
./gradlew publishToMavenLocal
and use 
mavenLocal()
in project using ktor (using custom version we're using) then it works fine. However, when I try to publish to gitlab maven repo I'm running in to some issues with symbols not found for a few of the artifacts (have updated 
publish.gradle
locally to point to our repo). Is there particular publication task I should run (have tried a few)? Screenshot shows example....
ktor-server-core
seems fine but having issues resolving symbols from `ktor-server-host-common`` for some reason
hmm, I've no idea what cause of issue was but I changed version number and did fresh publication and seems to be ok now.....perhaps something had gone wrong with previous publication or perhaps some caching issue.....
@Aleksei Tirman [JB] I can try and create PR for this....do you have any particular preference for where/how this should be configured?
a
I don’t. @e5l, please advise.
e
Yep, PR would be great. We actually can add it to the 
2.1.0
this month if there are no breaking changes
j
I would need to rebase this off master (currently based on 1.6.3) and add tests but just to check if following is reasonable approach here (seems to be one used later on with trust store config) https://github.com/ktorio/ktor/compare/main...joreilly:ktor:tls_version_block?expand=1
e
Yep
j
the above code is just for Netty (which is what we're using here).....assume similar code would need to be added for Jetty and Tomcat? Also looks like there 
.api
file that needs to be updated?
e
It's ok to update 
.api
with 
apiDump
gradle task
👍 1
j
ok, I've updated to rebase on latest code and also added code for Tomcat and Jetty.....need to see now how best to test this (any pointers very warmly welcomed 🙂 ) https://github.com/ktorio/ktor/compare/main...joreilly:ktor:enable_protocols?expand=1
(fixed url)
e
Could you open PR?
j
I still haven't figured out tests yet....will I open up as is for now?
e
I can run tests on CI
j
ok
seeing several failures in CI tests so far for the PR but haven't been able to link them yet to my changes.....but I could be missing something
I had run 
jvmTest
here locally fwiw and they had passed
e
Yep, it looks like fails are not related
j
Looks like builds are ok now again? However I don't seem to have ability to retry the build for that PR?
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