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

[William]

Ok i have done some testing with rdns=false or commented out
I have replaced our internal domain with testdomain and our kerberos realm with EXAMPLE.COM

DNS:

dig searchsite.testdomain
searchsite.testdomain.    2264    IN    A    10.0.0.10
dig sharepointsite.testdomain
sharepointsite.testdomain.    1325    IN    A    10.0.0.10

dig -x 10.0.0.10
10.0.0.10.in-addr.arpa. 27924    IN    PTR    2010searchsite.testdomain.
10.0.0.10.in-addr.arpa. 27924    IN    PTR    sharepointsite.testdomain.

(I know not my configuration)

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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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