Date: Thu, 11 Feb 1999 07:52:15 -0800 (PST) From: mystify@friley-184-92.res.iastate.edu To: freebsd-gnats-submit@FreeBSD.ORG Subject: bin/10030: Kerberized telnet fails to encrypt when a hostname alias is used (patch included) Message-ID: <199902111552.HAA05155@hub.freebsd.org>
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>Number: 10030
>Category: bin
>Synopsis: Kerberized telnet fails to encrypt when a hostname alias is used (patch included)
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Feb 11 08:00:01 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Patrick Hartling
>Release: 4.0-current
>Organization:
ICEMT
>Environment:
FreeBSD friley-184-92.res.iastate.edu 4.0-CURRENT FreeBSD 4.0-CURRENT #0: Wed Feb 10 10:53:07 CST 1999 mystify@friley-184-92.res.iastate.edu:/usr/src/sys/compile/xDOGBERT i386
>Description:
If 'telnet -ax' is used with a hostname that is an alias for a machine's
actual hostname, Kerberos encryption fails. This can happen when an
alias cycles through several IP addresses. For example,
isua.iastate.edu is an alias for isua[1-5].iastate.edu
>How-To-Repeat:
Do 'telnet -ax <hostname>' where <hostname> is an alias.
>Fix:
The following patch fixes the problem:
*** crypto/telnet/telnet/commands.c.orig Tue Feb 9 21:09:38 1999
--- crypto/telnet/telnet/commands.c Tue Feb 9 21:53:43 1999
***************
*** 2382,2387 ****
--- 2382,2395 ----
memmove((caddr_t)&sin.sin_addr, host->h_addr, host->h_length);
#endif /* defined(h_addr) */
strncpy(_hostname, host->h_name, sizeof(_hostname));
+
+ /* Ensure that we have the real hostname. */
+ host = gethostbyaddr((char*) &sin.sin_addr,
+ sizeof(sin.sin_addr), AF_INET);
+ if ( host ) {
+ strncpy(_hostname, host->h_name, sizeof(_hostname));
+ }
+
_hostname[sizeof(_hostname)-1] = '\0';
hostname = _hostname;
} else {
>Release-Note:
>Audit-Trail:
>Unformatted:
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