Messages in this thread | | | Subject | Re: Linux login security approaches | From | Krzysztof Halasa <> | Date | 09 Dec 1998 22:02:57 +0100 |
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Neil Conway <nconway.list@ukaea.org.uk> writes:
> Linux needs some sort of "SAK" - someone else pointed out that it's > already doable with serial lines. How about with X? Does one simply do > "C-A-Backspace"? > > How are people dealing with this at present?
At the console, you can press alt-sysrq-k - SAK. At X console, killing Xserver with ctrl-alt-bs will do. Using telnet/ssh/etc you don't have this problem at all.
However you can't do that when using dial-up connection - previous user can easily set CLOCAL flag on /dev/ttyS* and have a trojan get your login/password when you call.
The solution here is to make the dial-in user unable to change this tty flag (and possibly other ones) - I believe getty using TIOCSLCKTRMIOS/TIOCGLCKTRMIOS should be enough.
Looks like it's a userspace problem. -- Krzysztof Halasa Network Administrator of The Palace of Youth in Warsaw
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