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If you see that user 'clara' is logged in with the 'who' or 'w' command or
whatever, and you wish to talk to her for some reason or another, you'd type
'write clara'. Clara then would see on her screen something like this (given
that you are username 'shark'):
[3 ^G's] Message from shark on ttyi13 at 23:14 ...
You then type away at her, and whatever you type is sent to her terminal
line-by-line. If she wanted to make it a conversation rather than a
monologue, she'd type 'write shark,' you'd get a message similar to the above
on your terminal, and the two of you would type away at each other to your
little heart's content. If either one of you wanted to end the conversation,
you would type a ^D. They would then see the characters 'EOF' on their
screen, but they'd still be 'write'ing to you until they typed a ^D as well.
Now, if you're on a bigger installation you'll probably have some sort of
full-screen windowing chat program like 'talk'. My version of talk sends the
following message:
Message from Talk_Daemon@tibsys at 23:14 ...
talk: connection requested by shark@tibsys.
talk: respond with: talk shark@tibsys
Anyway, here's where the fun part begins: It's quite easy to put a sample
'write' or 'talk' message into a file and then edit so that the 'from' is a
different person, and the tty is listed differently. If you see that your
dorky friend roger is on ttyi10 and the root also happens to be logged on on
ttyi01, make the file look something like this:
[3 control-G's] Message from root on ttyi01 at [the current time]
wackawackawackawackawacka!!!
[or a similarly confusing or rude message...]
EOF
Then, send this file to roger's terminal with:
cat filename > /dev/ttyi10
He'll get the message on his terminal and wonder what the hell the superuser
is talking about. He might even 'write' back to the superuser with the intent
of asking 'what the hell are you talking about?'. For maximum effectiveness,
*simultaneously* send a message to root 'from' roger at the appropriate
terminal with an equally strange message - they'll then engage in a
conversation that will go something like "what did you mean by that?" "what
do you mean, what do I mean? What did *you* mean by that?" etc. A splendid
time is guaranteed for all! Note that you don't have to make 'root' the
perpetrator of the gag, any two currently logged-in users who have their
terminals open for messages can join in on the fun.
Similarly, you can fake a few 'talk' pages from/to two people...they will then
probably start talking...although the conversation will be along the lines of
"what do you want?" "you tell me." "you paged me, you tell *me." etcetera,
while you laugh yourself silly or something like that.
A variation on the theme: As I said, when using 'write' you type a ^D to end
the conversation, and the person you're typing at sees an 'EOF' on their
screen. But you could also just *type* 'EOF', and they'd think you've
quit...but you still have an open line to their terminal. Even if they later
turn messages off, you still have the ability to write to their terminal.
Keeping this fact in mind, anybody who knows what they're doing can write a
program similar to my 'block' program above that doesn't log a user out when
they appear on the system, but opens their tty as a device and keeps the file
handle in memory so you can redirect to their terminal - to write rude
messages or to log them out or whatever - at any time, until they log out.
As I said, there was no great amount of genius in the above discourse, but
it's a pastime I enjoy occasionally...
-- Shooting Shark
"the first fact to face is that unix was not developed with security, in any
realistic sense, in mind..."
-- Dennis M. Ritchie
"Oryan QUEST couldn't hack his way out of a UNIX system, let alone into one."
-- Tharrys Ridenow
===== Phrack Magazine presents Phrack 15 =====
===== File 3 of 8 =====
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* *
* How to "Steal" Local Calls from Most Payphones *
* *
* August 25, 1987 *
* *
* By Killer Smurf and Pax Daronicus *
* *
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Most of you have seen WarGames, right? Remember the part where David
was stranded in Colorado and needed to call his girlfriend in Seattle? We
knew you did. If you didn't, what David done was unscrew the mouthpiece