** Description changed:
- Currently LightDM connects to an XDMCP enabled X server using the first
- suitable address in the XDMCP Request packet. However, some clients may
- put a number of addresses in this message and potentially they are not
- all routable. If the address the request message came from is in the
- list we should use that first as that is more likely to be a routable
- address. This also matches the behaviour of GDM which ignores the
- contents of the Request packet anyway.
+ [Impact]
+ Currently LightDM connects to an XDMCP enabled X server using the first
suitable address in the XDMCP Request packet. However, some clients may put a
number of addresses in this message and potentially they are not all routable.
If the address the request message came from is in the list we should use that
first as that is more likely to be a routable address. This also matches the
behaviour of GDM which ignores the contents of the Request packet anyway.
+
+ [Test Case]
+ 1. Start LightDM with XDMCP enabled
+ 2. Connect with a client that puts a number of addresses in the Request packet
+
+ Expected result:
+ LightDM prefers the address the Request came from over the other addresses.
+
+ Observed result:
+ LightDM always picks the first address.
+
+ [Regression Potential]
+ There is a possibility of a behaviour change in existing clients that had two
valid addresses, though the particular address shouldn't matter (unless complex
firewalling / routing rules are being used). There is a risk that XDMCP
behaviour could have been broken by the change (tested with regression tests).
** Changed in: lightdm/1.14
Status: Fix Committed => Fix Released
** Also affects: lightdm (Ubuntu Vivid)
Importance: Undecided
Status: New
** Changed in: lightdm (Ubuntu Vivid)
Status: New => Triaged
** Changed in: lightdm (Ubuntu Vivid)
Importance: Undecided => Medium
** Changed in: lightdm (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1481561
Title:
Connect to XDMCP clients on address requests come from if available
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