krb5 address checks and loopback connections
Nicolas.Williams at ubsw.com
Tue Jul 9 12:03:01 EDT 2002
IMO, hosts should never accept incoming packets with source or
destination loopback addresses. If a host does accept such
packets then I would consider that a bug in the OS.
And, IMO, the Linux behaviour of using loopback IPv6 addresses
when connecting to non-loopback-but-local addresses is not too
So go ahead, put this feature in and put in a note about the
OS being held responsible for loopback spoof avoidance - make
the feature a compile time option conditional on the host
being a Linux host, say, or write a configure test for the
behaviour in question :) if you find the possibility of an
OS lacking loopback spoof avoindace to be too scary.
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