Messages in this thread | | | Date | Tue, 8 Dec 1998 12:12:10 GMT | From | "Stephen C. Tweedie" <> | Subject | Re: Linux login security approaches |
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Hi,
On Mon, 7 Dec 1998 14:41:43 +0100, Lenart Gabor <lgb@hal2000.hal.vein.hu> said:
> Some hours ago we had a discuss on Linux security, here at the University. > I mentioned that Linux has got a weak point : every user can write a fake > login program and even the system administrator can think that it's mgetty > and type the root password :( This kind of Trojan programs can be preceded. > We should define a key combination which is unmaskable by ANY process, and > login procedures should begin by pressing this combo.
It is called "secure attention key". For serial logins, you get a SAK by sending a break (assuming you have enabled SAK: "man setserial"). For console logins, you need to enable alt-sysreq when you compile the kernel, and "alt-sysrq-k" is the SAK key (see linux/Documentation/sysrq.txt).
--Stephen
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