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Master keys (for TCP[port=8082]/SSL/WebSocket/JSON and for DTLS-SRTP)
are present in the capture file comments.
Created by starting Chromium 40.0.2214.111 with a new profile, disabling
any settings that could cause network interference (also set
about:blank as home page). Visit
https://webrtc.freeswitch.org/verto/index.html to load everything in
cache.
Then restart with the sandbox disabled to avoid the suid sandbox (which
interferes with getting SSL keys from DTLS-SRTP) and start the actual
capture.
Command to launch the browser:
SSLKEYLOGFILE=premaster.txt \
chromium --user-data-dir=/tmp/cr \
--disable-component-extensions-with-background-pages \
--disable-web-resource --disable-background-networking \
--disable-sandbox --single-process
Analyse with:
capinfos -k webrtc-freeswitch.pcapng |
grep -Po 'CLIENT_RANDOM \S+ \S+' > premaster.txt
wireshark -r webrtc-freeswitch.pcapng \
-o ssl.keylog_file:premaster.txt \
-o dtls.keylog_file:premaster.txt \
-o http.ssl.port:8082
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