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000372_news@columbia.edu_Mon Nov 13 04:15:37 1995.msg
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From: itz@rahul.net (Ian T Zimmerman)
Newsgroups: comp.protocols.kermit.misc
Subject: protect modem under C-Kermit?
Date: 13 Nov 1995 04:15:37 GMT
Organization: a2i network
Lines: 35
Message-Id: <ITZ.95Nov12201537@kronstadt.rahul.net>
Nntp-Posting-Host: kronstadt.rahul.net
Apparently-To: kermit.misc@watsun.cc.columbia.edu
Hi. This may be a FAQ, but it isn't in the C-Kermit manual which I
read cover to cover. I am looking for a U*x communication program
which is both secure and flexible. This means:
secure - non-root users can't under any circumstances enter the modem
command mode.
flexible - all users can specify their own phone book files, line
setup options (baud, data/parity/stop, etc.) and scripts to execute
once online. But, they must _not_ be permitted to specify their own
modem initialization strings.
It seems to me that every modem comm program in existence is either
fascist - ie. secure and inflexible. Examples: cu, tip. Or
libertarian - ie. flexible and insecure. Examples: minicom, and,
unfortunately, C-kermit.
That's because
1/ the "connect" command can be entered at any time, even before
the modem has a carrier. Then users can talk directly to the modem and
reprogram it to their hearts' content.
2/ Users can execute "set dial init-string", thus setting modem
options indirectly. A special case of this is that they can reenable
the modem escape sequence (`+++') if it has been disabled, then use it
to get back to command mode at an arbitrary time.
I would very much like to get around this problem in C-Kermit ,
because otherwise I like it a lot, for its flexibility and
simplicity. Anybody there knows how to do this (preferably without
hacking C code) ?
--
Ian T Zimmerman +-------------------------------------------+
P.O. Box 13445 I With so many executioners available, I
Berkeley, California 94712 I suicide is a really foolish thing to do. I
USA <itz@rahul.net> +-------------------------------------------+