Date: Tue, 25 Jan 2000 07:49:55 +0100 (CET) From: Andre Albsmeier <andre.albsmeier@mchp.siemens.de> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/16342: Problems with krb_realmofhost() and/or krb_get_lrealm() Message-ID: <200001250649.HAA08637@internal>
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>Number: 16342
>Category: bin
>Synopsis: Problems with krb_realmofhost() and/or krb_get_lrealm()
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Jan 24 22:50:03 PST 2000
>Closed-Date:
>Last-Modified:
>Originator: Andre Albsmeier
>Release: FreeBSD 3.4-STABLE i386
>Organization:
>Environment:
FreeBSD-3.4-STABLE
/etc/make.conf.local contains MAKE_KERBEROS4=1
/etc/hosts as follows, please note that there is no fully qualified hostname
127.0.0.1 localhost localhost.my.domain myname.my.domain
192.168.254.254 schlappy sc
>Description:
I was using xlockmore on my laptop. The hostname was set to "schlappy".
I am not using fully qualified hostnames since I have no own domain.
When the screen was locked by xlock and I entered my password, I noticed
that it took a few seconds until the screen was unlocked again. xlock then
has crashed with a coredump. I suspected a problem in xlock and looked with
gdb at the corefile, here is part of the output:
#0 0x282235df in send () from /usr/lib/libc.so.3
#1 0x2821fa40 in res_send () from /usr/lib/libc.so.3
#2 0x2821c245 in res_query () from /usr/lib/libc.so.3
#3 0x2821c7b7 in res_querydomain () from /usr/lib/libc.so.3
#4 0x2821c4a6 in res_search () from /usr/lib/libc.so.3
#5 0x280c14bb in dns_lookup () from /usr/lib/libkrb.so.3
#6 0x280bea4b in k_gethostname () from /usr/lib/libkrb.so.3
#7 0x280bebc5 in krb_realmofhost () from /usr/lib/libkrb.so.3
#8 0x280be8e0 in krb_get_lrealm () from /usr/lib/libkrb.so.3
#9 0x280bec3e in krb_realmofhost () from /usr/lib/libkrb.so.3
#10 0x280be8e0 in krb_get_lrealm () from /usr/lib/libkrb.so.3
#11 0x280bec3e in krb_realmofhost () from /usr/lib/libkrb.so.3
#12 0x280be8e0 in krb_get_lrealm () from /usr/lib/libkrb.so.3
#13 0x280bec3e in krb_realmofhost () from /usr/lib/libkrb.so.3
#14 0x280be8e0 in krb_get_lrealm () from /usr/lib/libkrb.so.3
...
... continuing
...
#58043 0x280bec3e in krb_realmofhost () from /usr/lib/libkrb.so.3
#58044 0x280be8e0 in krb_get_lrealm () from /usr/lib/libkrb.so.3
#58045 0x280bec3e in krb_realmofhost () from /usr/lib/libkrb.so.3
#58046 0x280be8e0 in krb_get_lrealm () from /usr/lib/libkrb.so.3
#58047 0x280bec3e in krb_realmofhost () from /usr/lib/libkrb.so.3
#58048 0x280be8e0 in krb_get_lrealm () from /usr/lib/libkrb.so.3
#58049 0x280bec3e in krb_realmofhost () from /usr/lib/libkrb.so.3
#58050 0x280be8e0 in krb_get_lrealm () from /usr/lib/libkrb.so.3
#58051 0x804ff0d in krb_check_password (pwd=0x282469fc, pass=0xbfbfcd90 "PW_replaced")
at ./passwd.c:1519
#58052 0x804fe38 in checkPasswd (buffer=0xbfbfd1f0 "PW_replaced") at ./passwd.c:1173
#58053 0x804d604 in getPassword () at ./xlock.c:2318
#58054 0x804e04a in lockDisplay (display=0x8075000, do_display=1)
at ./xlock.c:2635
#58055 0x804fb8d in main (argc=1, argv=0xbfbfd520) at ./xlock.c:3501
#58056 0x804b34d in _start ()
It seemed that there is a problem with krb_realmofhost() and
krb_get_lrealm() which automagically are enabled when compiling
xlockmore with MAKE_KERBEROS4=1 defined in /etc/make.conf.local.
>How-To-Repeat:
I could isolate the problem with the following small test program
which has to be compiled with: cc k4test.c -lkrb -ldes
-------------------------- snip ----------------------------------
#include <stdio.h>
#include <krb.h>
#include <des.h>
#include <netinet/in.h>
main() {
fprintf( stderr, "%s\n", krb_realmofhost( "schlappy" ));
}
-------------------------- snap ----------------------------------
The program spins around as xlock does. This stops immediately
when the hostname "schlappy" is additionally included with any
domain appended in /etc/hosts, e.g.
192.168.254.254 schlappy.domain.org schlappy sc
>Fix:
unknown
>Release-Note:
>Audit-Trail:
>Unformatted:
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