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

[Jesper Krogh]

Public bug reported:

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) {

** Affects: krb5 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
krb5 prefers the reverse pointer no matter what for locating service tickets.  
https://bugs.launchpad.net/bugs/571572
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