[5482] in Kerberos
Kerberos5 beta5 login.krb5 tty-handling bug
daemon@ATHENA.MIT.EDU (Jonathan Stone)
Tue Jul 11 16:31:45 1995
Date: Tue, 11 Jul 1995 13:19:03 -0700
From: Jonathan Stone <jonathan@DSG.Stanford.EDU>
To: kerberos@MIT.EDU
[[Previously sent to krb5-bugs but not the mailing-list/newsgroup]]
The MIT Kerberos telnet daemon has never worked properly at Stanford
DSG on Ultrix 4.2a (and, I think, Ultrix 4.1).
Specifically, the pseudo-tty state for the server side a telnet
session ends up ``raw mode'' while login executes. That is,
input is not echoed, carriage-return is not treated as a line
delimiter, newlines are not mapped to cr/nl on output, etc.
A cut-and-paste of an example login session (note staircasing of output
and lack of echo of username!) is:
Connected to Pescadero.Stanford.EDU.
Escape character is '^]'.
ULTRIX (Pescadero.Stanford.EDU) (ttypb)
login: Password:
Login incorrect
login: Connection closed by foreign host.
It turns out that appl/bsd/login.c is using TIOCLSET regardless
of whether or not it's configured to use termios or the BSD tty
interface. The following patch fixes that, at least for Ultrix.
(Replacing the ``#ifdef TIOCLSET''` with ``#ifndef POSIX_TERMIOS''
would probably be cleaner; but I cant' test that on enough platforms.)
*** src/appl/bsd/login.c.DIST Fri Apr 28 17:36:13 1995
--- src/appl/bsd/login.c Thu May 18 20:32:20 1995
***************
*** 397,402 ****
--- 397,409 ----
#if !defined(_AIX)
ioctlval = 0;
+
+ #ifdef ultrix
+ /* Ultrix 4.2a apparently resets the tty to ``raw mode''
+ * when TIOCLSET is called. So pretend we dont have it. */
+ #undef TIOCLSET
+ #endif
+
#ifdef TIOCLSET
/* linux, sco don't have this line discipline interface */
(void)ioctl(0, TIOCLSET, (char *)&ioctlval);
