[ws 3.2.0] quic handshake is decrypted but subsequent packets are not

QUIC

asked Dec 25 '19

magesh
1 ●1 ●1 ●2

updated Dec 25 '19

I'm trying to get an understanding of the QUIC protocol using wireshark (and other material from various sources).

Steps that I followed:

captured (using tshark) QUIC traffic between a local client server (generated using mozilla/neqo, with SSLKEYLOGFILE env to store traffic secrets).
set the captured traffic secrets path in wireshark preferences (Protocols -> TLS [(Pre)-Master-Secret log filename])
open the pcap file

Expected:

decrypted payloads for QUIC handshakes
decrypted payloads for subsequent QUIC packets

Observed:

[PASS] decrypted payloads for QUIC handshakes
[FAIL] decrypted payloads for subsequent QUIC packets

Are there any additional steps that I need to follow to decrypt all QUIC packets?

screenshot showing the issue: wireshark-quic-screenshot

Comments

(This question was cross-posted at https://www.wireshark.org/lists/wireshark-users/201912/msg00009.html)

Lekensteyn ( Jan 3 '0 )

add a comment

2 Answers

Sort by » oldest newest most voted

answered Jan 3 '0

Lekensteyn
2346 ●3 ●19 ●29 https://lekensteyn.nl

From my reply at https://www.wireshark.org/lists/wireshark-users/202001/msg00000.html:

In your screenshot, the visible frames are:

1. C->S Protected Payload
2. S->C Handshake, PKN:0, CRYPTO
3. C->S Handshake, PKN:0, ACK, CRYPTO
4. S->C Handshake, PKN:1, ACK
5. C->S Protected Payload
...
11. S->C Protected Payload

The selected packet (frame 4) shows that draft 24 is in use. I would have expected an Initial Packet message to be present. Perhaps frame 1 has additional data.

Do frames 5-11 actually mention that decryption failed? If so, it should describe the reason. If you were expecting HTTP/3, note that it is still work in progress, and not supported in the current Wireshark 3.2 release nor the development version, v3.3.0rc0-225-g76dfe6004b.

For better analysis, please attach the original packet capture and the SSLKEYLOGFILE file. For the current state of QUIC support in Wireshark, please refer to https://github.com/quicwg/base-drafts/wiki/Tools#wireshark and find capture samples at https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13881