[2604] in Kerberos-V5-bugs
pending/317: Re: Kerberos v51.0 release v4 compat mode problems
daemon@ATHENA.MIT.EDU (Roland Schemers)
Sun Dec 22 18:52:06 1996
Resent-From: gnats@rt-11.MIT.EDU (GNATS Management)
Resent-To: gnats-admin@rt-11.MIT.EDU
Resent-Reply-To: krb5-bugs@MIT.EDU, Roland Schemers <schemers@stanford.edu>
Date: 22 Dec 1996 15:50:38 -0800
From: Roland Schemers <schemers@stanford.edu>
Cc: krb5-bugs@MIT.EDU
In-Reply-To: blizzard@odin.nyser.net's message of 22 Dec 1996 21:35:55 GMT
>Number: 317
>Category: pending
>Synopsis: Re: Kerberos v51.0 release v4 compat mode problems
>Confidential: yes
>Severity: serious
>Priority: medium
>Responsible: gnats-admin
>State: open
>Class: sw-bug
>Submitter-Id: unknown
>Arrival-Date: Sun Dec 22 18:52:00 EST 1996
>Last-Modified:
>Originator:
>Organization:
>Release:
>Environment:
>Description:
>How-To-Repeat:
>Fix:
>Audit-Trail:
>Unformatted:
The following message is a courtesy copy of an article
that has been posted as well.
blizzard@odin.nyser.net (Christopher Blizzard) writes:
>
> There seems to be a problem with running the v5 telnetd server without a
> krb5.conf file in place when using a v4 telnet client. The telnetd server
> will seg fault silently on startup. To work around this, touch
> /etc/krb5.conf
>
The bug is in src/lib/krb4/g_cnffile.c:krb__get_srvtabname, line 61:
char *
krb__get_srvtabname(default_srvtabname)
char *default_srvtabname;
{
krb5_context context;
const char* names[3];
char **full_name = 0, **cpp;
krb5_error_code retval;
char *retname;
krb5_init_context(&context);
names[0] = "libdefaults";
names[1] = "krb4_srvtab";
names[2] = 0;
61: retval = profile_get_values(context->profile, names, &full_name);
if (retval == 0 && full_name && full_name[0]) {
retname = strdup(full_name[0]);
for (cpp = full_name; *cpp; cpp++)
krb5_xfree(*cpp);
krb5_xfree(full_name);
} else {
retname = strdup(default_srvtabname);
}
krb5_free_context(context);
return retname;
}
krb5_int_context is failing and setting context to NULL. Thus the call
to profile_get_values fails. Just need to rearrange things slightly, i.e:
krb5_init_context(&context);
names[0] = "libdefaults";
names[1] = "krb4_srvtab";
names[2] = 0;
if (context &&
(retval = profile_get_values(context->profile, names, &full_name))
&& retval == 0 && full_name && full_name[0]) {
retname = strdup(full_name[0]);
for (cpp = full_name; *cpp; cpp++)
krb5_xfree(*cpp);
krb5_xfree(full_name);
} else {
retname = strdup(default_srvtabname);
}
if (context) krb5_free_context(context);
return retname;
roland
