Qt-contributors-summit-2013-Qt Network CS 2013

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Qt Network Session – Qt Contributors Summit 2013

Talking Points

• Option to add random padding to https requests. This makes us more resistant to the various https attacks that have been floating around. * X-Qt-Padding: some noise of varying length *Recommendation 3 from http://www.isg.rhul.ac.uk/tls/RC4biases.pdf
• Who is working on the stack?
• What’s up with the constant failing tests in the CI, and how can we fix the situation?
• Support for diffie-hellman ciphers
• Support for redirects
• Pause on connect
• Performance
• Peter’s chromium qnam port
• Automatic fallback support
• Certificate store API / Caching intermediates
• OCSP support
• Replacing the QNAM disk cache
• HTTP 2.0 / SPDY support
• Web sockets
• Enginio and Qt network
• Webkit2 and custom QNetworkAccessManagers

Off topic, but related:

• PBKDF2 / BCrypt support (QtCore really)
• Should we warn if running as root? If running suid?

Notes by Thiago:

• DH key exchange
  • no public API
  • easy to implement, hard to test
• OCSP
  • adds latency: needs to query the OCSP server
  • Richard implemented one year ago
  • still works, but hasn’t worked on it in a while
  • enabled by default
  • QSslSocket level
• Certificate store:
  • storing intermediate certs from broken servers that don’t return the whole chain
  • browsers do that to work around issues in the wild
  • adds security
  • certificates are not trusted, so they don’t add a new security attack vector
  • virtual QSslCertificate QAbstractSslCertificateStore::certificateForId(QSslCertificateId)
• QNAM redirects
  • discussed in the DD Contributor Day
  • vector for insecurity (users do it wrong)
  • should be configurable
  • we don’t need to fix this for the browser case → they already have the code
  • we need it only for the simple application cases
  • allow redirect from HTTP to HTTPS, allow within-protocol
  • could work with pausing
  • readyRead & metaDataChanged from the final, sslErrors per connection
• Pause on connect:
  • Already discussed, implementation challenges and details known
  • Work is missing (Peter doesn’t have time)
• Performance: latency problems
  • Helped by the pre-connect
• Replacing QNAM port:
  • With Blink:
    • difficult, it’s too big for QtNetwork
    • no guarantee that we’ll get a “library” interface
  • libcurl:
    • they’re behind us
• SPDY / HTTP/2.0:
  • HTTP/2.0 adopted SPDY 3.0’s transport format
    • we can start supporting SPDY to get on our way to HTTP/2.0
  • libcurl has started