** Changed in: lightdm (Ubuntu Precise)
Assignee: Robert Ancell (robert-ancell) => (unassigned)
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https://bugs.launchpad.net/bugs/1517685
Title:
XDMCP server starts without authentication if configured key does not
exist
Status in Light Display Manager:
Fix Released
Status in Light Display Manager 1.10 series:
Fix Released
Status in Light Display Manager 1.14 series:
Fix Released
Status in Light Display Manager 1.16 series:
Fix Released
Status in Light Display Manager 1.2 series:
Fix Released
Status in lightdm package in Ubuntu:
Fix Released
Status in lightdm source package in Precise:
Confirmed
Status in lightdm source package in Trusty:
Fix Released
Status in lightdm source package in Vivid:
Fix Released
Status in lightdm source package in Wily:
Fix Released
Bug description:
[Impact]
An incorrectly configured XDMCP server will start without authentication
instead of disabling XDMCP / stopping LightDM.
[Test Case]
1. Set up LightDM to run an XDMCP server using an XDM authentication key,
i.e. in lightdm.conf:
[XDMCPServer]
enabled=true
key=key-name
2. Do not create /etc/lightdm/keys.conf or do not define 'key-name' in
keys.conf.
3. Start LightDM
4. Connect XDMCP client.
Expected result:
Either LightDM doesn't start or the XDMCP server doesn't start.
Observed result:
XDMCP server starts without authentication, any XDMCP client is able to
connect. Debug message printed to log warning about missing key, but not easy
to spot.
[Regression Potential]
Low - change is to not start LightDM if this case occurs. This could affect
someone who currently has a misconfigured LightDM. In this case a warning
message is printed to the log.
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https://bugs.launchpad.net/lightdm/+bug/1517685/+subscriptions
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