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ngtcp2 + gnutls fails to connect h3: "Resource temporarily unavailable" #6896

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bagder opened this issue Apr 15, 2021 · 4 comments
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ngtcp2 + gnutls fails to connect h3: "Resource temporarily unavailable" #6896

bagder opened this issue Apr 15, 2021 · 4 comments
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HTTP/3 needs-info

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@bagder
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@bagder bagder commented Apr 15, 2021

It looks like boringssl backed server does not like ClientHello generated by GnuTLS. It is hard for me to debug this because it is TLS internal stuff.

Similar to #6864 but this only happens with GnuTLS builds now.

Originally posted by @tatsuhiro-t in #6864 (comment)
@bagder bagder added the HTTP/3 label Apr 15, 2021
@tatsuhiro-t
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@tatsuhiro-t tatsuhiro-t commented Apr 15, 2021

It looks like GnuTLS sends legacy session ID which must be prohibited in QUIC: https://tools.ietf.org/html/draft-ietf-quic-tls-34#section-8.4
Now I have to find how to make GnuTLS stop sending this.
Meanwhile it seems that OpenSSL does not check this thing out, which smells like a bug.

@tatsuhiro-t
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@tatsuhiro-t tatsuhiro-t commented Apr 15, 2021

@ueno Is there any way to tell GnuTLS to disable TLSv1.3 compatibility mode?

It looks like #undef TLS13_APPENDIX_D4 disables it, but it is a compile time option.

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@ueno ueno commented Apr 15, 2021

Not currently, but it should be easy to add. I've filed an issue at:
https://gitlab.com/gnutls/gnutls/-/issues/1208

@bagder
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@bagder bagder commented May 16, 2021

I'm going to close this issue here since this has been determined to be a GnuTLS bug and it isn't very useful for us to keep it open here as well. This should work with curl once GnuTLS is fixed to do right.

@bagder bagder closed this as completed May 16, 2021
@katojunya katojunya mentioned this issue Jun 7, 2021
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bagder pushed a commit that referenced this issue Jun 8, 2021
@katojunya @bagder
ngtcp2: disable TLSv1.3 compatible mode when using GnuTLS
a3a298d 
The latest GnuTLS-3.7.2 implements disable switch for TLSv1.3 compatible
mode for middle box but it is enabled by default, which is unnecessary
for QUIC.

Fixes #6896
Closes #7202
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@ueno @bagder @tatsuhiro-t