Summary

This is somewhat of a catch-all for the most important features that we wish to land to improve usability of NetworkManager. Adding proxy and firewall support were discussed at UDS-O, and so was IPv6 (briefly) in this spec, and a little more in detail in the IPv6 health-check spec.

Release Note

A number of enhancements to NetworkManager have been done in Oneiric. In particular, IPv6 addresses are now requested by default, although their presence remains optional to bring up an interface. Proxy and firewall configuration support, integrated with an user's connection to form per-network "profiles" have been added. Firewall and proxy are off by default.

Rationale

It's getting more common to require proxy configurations in some environments to access the Internet; and doing proxy configuration manually when the network location changes tends to be cumbersome.

Host-based firewalls are very common in Windows environments, and increasingly more common on Linux as the myths of being "unbreakable" and virus-free vanish. Furthermore, IPv6 support brings back the requirement of using host-based firewalls due to the somewhat direct access of systems to the Internet via autoconfiguration; which makes network-wide firewalling complex.

User stories

Bob needs to use a proxy at work to browse the web, yet doesn't use one at home. Right now he has to manually bring up the proxy configuration dialog and change his settings, remembering to change them back when he's in the other location.

John is worried about the security of his data. He runs a webserver on his system and SSH to share files with his coworkers and connect to his system remotely from within the office, but he doesn't want those to be exposed to the internet when he is at home. He uses ufw which he has to remember to turn off and on when he changes locations.

Marc shares his music with his family when at home. He wants a firewall configuration while at home that allows this and a different firewall configuration while at the coffee shop that does not.

Assumptions

Firewall support: as a first pass we'll assume the simplest possible settings to be exposed to the users. What this means is providing a way to turn on or off the firewalling on a per-network basis, and exposing presets from UFW to open specific applications.

Proxy support: GNOME already has the concept of profiles for proxy settings. We can safely assume it sufficient to match profiles to connections as a 1:1 relationship, and making sure we keep a "default" proxy setting which enables to proxy.

Design

Proxy settings already exist in System Settings. Ubuntu should not have multiple interfaces to proxy settings.

Second draft of a firewall settings design:

settings-firewall.png settings-firewall-exception.png

Questions that could alter this design:

Comments from security team:

This specification is now complete at https://wiki.ubuntu.com/Networking#Firewall

Implementation

UI Changes

Should include one extra page per "feature": may be tabs, one "Proxy", one "Firewall", and expose as few settings as possible to make it really simple to configure (or ignore).

Code Changes

Discussed proxy implementation with Dan Williams (dcbw). Proxy support will require keeping track of proxy settings in an object such as NMSettingsProxy. It may be necessary to get at least WPAD, which is already retrieved from DHCP, to integrate into this (since it's proxy auto-detection). This would likely end up an additional section in the configuration file: 

[proxy]
profile=Home

Firewall implementation would likely rather be done as a plugin, since it's very distro-specific. In our case, using UFW, speaking in DBUS to UFW to turn on or off firewalling and choosing settings (or choosing a specific profile at the UFW level, pending implementation there).

Migration

There is no previous data to migrate. Users will be presented with extra tabs which should make the configuration both discoverable, and very much out of the way from those who don't need it.

Test/Demo Plan

It's important that we are able to test new features, and demonstrate them to users.  Use this section to describe a short plan that anybody can follow that demonstrates the feature is working.  This can then be used during testing, and to show off after release. Please add an entry to http://testcases.qa.ubuntu.com/Coverage/NewFeatures for tracking test coverage.

This need not be added or completed until the specification is nearing beta.

Unresolved issues

This should highlight any issues that should be addressed in further specifications, and not problems with the specification itself; since any specification with problems cannot be approved.

BoF agenda and discussion

#uds-o #track #topic
What should we have in NetworkManager?
  * discussion about integrating firewall profiles into NM
  * UFW does not support profiles, but can be added
Upstream is dropping nm-applet, moving to gnome-shell
  * first option is to for nm-applet
  * second option is move to network-indicator, with NM as backend, and add UFW as an extension
UFW profiles
  * home - trust all machines on the network
  * not home - other case
  * per connection network setting?
    - e.g on wired, always enable firewall; on wireless XYZ, enable firewall, on wireless ZYX, disable firewall
    -different proxy settings for different connections.
1st pass:
- enable/disable
- ports/application profiles
- alpha 1 on and off
- [ACTION] jdstrand - add profile support by alpha 2
Possibly:
- on or off depending on connection
- profiles per connection (network manager doesn't have it)
- default profile
- profile based on the connection

CategorySpec

OneiricDesktopNetworkEnhancementsSpec (last edited 2011-08-05 15:24:29 by mpt)