Package: bsdutils? netstd? Version: bsdutils 1.3-1, netstd 1.17-1 Are `mesg y' terminals on Debian supposed to be g+w, or go+w ?
telnetd (from netbase) and mesg (from bsdutils) seem to thing g+w ought to be sufficient; however, write (also from bsdutils) seems to require go+w (though `richard', who was writing to me in another window at the time of the transcript below, didn't report that it complained about his terminal being `mesg n'). Making write setgid tty may solve the problem, but such a decision should only be taken after examining the code to make sure it's not a security problem. Ian. [ Running in an xterm ... ] chiark:~> finger Login Name Tty Idle Login Time Office Office Phone [...] iwj10 Ian Jackson - unpriv p4 Oct 4 12:47 (ealingbroadway.c) iwj10 Ian Jackson - unpriv p3 1:03 Oct 4 12:49 (ealingbroadway.c) iwj10 Ian Jackson - unpriv p5 Oct 4 12:50 (ealingbroadway.c) iwj10 Ian Jackson - unpriv p6 1:05 Oct 4 12:53 (ealingbroadway.c) richard Richard Kettlewell *p0 Oct 4 10:05 (muskogee.elmail.) richard Richard Kettlewell p7 Oct 4 12:59 (muskogee.elmail.) chiark:~> write richard write: /dev/ttyp7: Permission denied chiark:~> ll /dev/ttyp7 crw--w---- 1 richard tty 4, 199 Oct 4 14:55 /dev/ttyp7 chiark:~> ls -al /usr/bin/write -rwxr-xr-x 1 root root 12292 Jun 22 20:25 /usr/bin/write* chiark:~> ytalk richard chiark:~> ytalk -x richard chiark:~> grep mesg /etc/profile mesg y chiark:~> tty /dev/ttyp5 chiark:~> id uid=1001(iwj10) gid=1001(iwj10) groups=1001(iwj10) chiark:~> ll /dev/ttyp5 crw--w--w- 1 iwj10 iwj10 4, 197 Oct 4 15:01 /dev/ttyp5 chiark:~> Trying 131.111.131.114... Connected to chiark.chu.cam.ac.uk. Escape character is '^]'. Debian GNU/Linux 0.93 Copyright (C) 1994, 1995 Debian Association, Inc. and others chiark login: iwj10 Password: Last login: Wed Oct 4 12:31:00 on ttyc2 Copyright (C) 1994, 1995 Debian Association, Inc. and others Linux chiark 1.2.13 #2 Sat Sep 30 11:40:37 BST 1995 i486 Unauthorised access prohibited; if you do not know that you are authorised then you are not. See /info/rules.text for the rules for the use of chiark, and /info/chiark.text for information about the system. Recent items in /info/new - see the file for full details: 1) Problem with trn hanging believed fixed. (3.10.1995) 2) Default terminal message status is now `y'. (3.10.1995) 3) trn `l' (list groups) command should now work. (3.10.1995) -------------------------------------------------- 3:01pm up 4 days, 2:56, 8 users, load average: 0.48, 0.26, 0.09 chiark:~> tty /dev/ttyp1 chiark:~> ll /dev/ttyp1 crw--w---- 1 iwj10 tty 4, 193 Oct 4 15:01 /dev/ttyp1 chiark:~> exit exit Connection closed by foreign host.
