Date: Fri, 3 Nov 2017 15:39:00 +0100 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Subject: Re: Security risk of server side text editing in general and vim.tiny specifically On Fri, Nov 03, 2017 at 03:18:49PM +0100, Solar Designer wrote: > I am not saying things are good as they are; I think they are not. Like > I say, people neither know nor want to know this, and it means they > continue to do things insecurely. I don't currently have a solution. The closest to a solution I came up with so far (around year 2000, but still unimplemented) is two programs - call them give(1) and take(1) - for users to exchange files safely. From users' perspective, these would go along with write(1) and talk(1). From sysadmin's perspective, they'd be tools to use after using an unusually safe (allocating a new pty, filtering terminal escapes) implementation of su(1) (actually, it should become su(8), since no safe use of a "su" by a user is possible anyway) to access the user(s)' account(s) (to copy a file between two users, or between a user and root). Implementation-wise, give(1) and take(1) could either rely on having a shared directory with /tmp-like permissions on the same filesystem with the users' home directories (and this would be rather specialized, not addressing the need to easily share files that are not on /home) and use of hard links, or they'd need a daemon like talkd(8) or reuse sshd(8). And this last possibility brings us to what we can (and I sometimes do) use already - setting up temporary SSH keys with forced "cat < ..." or "cat > ..." commands, and using SSH for safely exchanging files by users of the same host, or of different hosts for this matter. It's just manual setup each time, and we could want to provide convenient tools to automate that. Alexander
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