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

[Tom Yu]

Our fix in #6922 appears to itself have a bug; we believe that
http://krbdev.mit.edu/rt/Ticket/Display.html?id=7124 resolves it. If you
need a back port, http://krbdev.mit.edu/rt/Ticket/Display.html?id=7164
is for krb5-1.9.x, and
http://krbdev.mit.edu/rt/Ticket/Display.html?id=7184 is for krb5-1.8.x.
(given that the initial report was against 1.8.1)

** Bug watch added: krbdev.mit.edu/rt/ #7124
   http://krbdev.mit.edu/rt/Ticket/Display.html?id=7124

** Bug watch added: krbdev.mit.edu/rt/ #7164
   http://krbdev.mit.edu/rt/Ticket/Display.html?id=7164

** Bug watch added: krbdev.mit.edu/rt/ #7184
   http://krbdev.mit.edu/rt/Ticket/Display.html?id=7184

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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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