[Bug 571572] Re: krb5 prefers the reverse pointer no matter what for locating service tickets.

[Tom Yu]

I can see no obvious source code changes to the krb5 packages between
Quantal and Raring that would result in the observed behavior of
rdns=false functioning on stock Raring libkrb5-3 but not on Quantal.
It's possible that the underlying bug in glibc got fixed in the
meanwhile.  I haven't confirmed the Raring result personally yet, but I
do confirm that Precise is broken.  I'll try to set up a public-facing
test fixture soon.

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https://bugs.launchpad.net/bugs/571572

Title:
  krb5 prefers the reverse pointer no matter what for locating service
  tickets.

Status in “krb5” package in Ubuntu:
  Confirmed

Bug description:
  I'm trying to upgrade workstations to lucid an fails to access our
  kerberos enabled websites. It reveals that the krb5 implementation in
  lucid now tries to resolve the "reverse dns" and aquire a tikket for
  <service>/<reverse dns> instead of <service>/<what the user typed in
  the first place>.

  The latter behavior is what the MS environment does and is what Ubuntu
  has done (i think) until Lucid. A diff of the sourcecode from hardy
  revealse that we now hint the getaddrinfo with AI_CANONNAME which it
  didnt before.

  Applying below patch enables the old behaviour.

  --- krb5-1.8.1+dfsg/src/lib/krb5/os/sn2princ.c.orig	2010-04-29 09:04:11.401567914 +0200
  +++ krb5-1.8.1+dfsg/src/lib/krb5/os/sn2princ.c	2010-04-29 09:04:21.762191834 +0200
  @@ -112,7 +112,7 @@
   
               memset(&hints, 0, sizeof(hints));
               hints.ai_family = AF_INET;
  -            hints.ai_flags = AI_CANONNAME;
  +//            hints.ai_flags = AI_CANONNAME;
           try_getaddrinfo_again:
               err = getaddrinfo(hostname, 0, &hints, &ai);
               if (err) {

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