Subject: bin/12040: openssh rhosts rsa support requires setuid root ssh binary
To: None <>
From: Duncan McEwan <duncan@MCS.VUW.AC.NZ>
List: netbsd-bugs
Date: 01/24/2001 14:08:20
>Number:         12040
>Category:       bin
>Synopsis:       openssh rhosts rsa support requires setuid root ssh binary
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 24 14:11:00 PST 2001
>Originator:     Duncan McEwan
>Release:        NetBSD-current of approx Jan 17th, 2001
Victoria University of Wellington, New Zealand
System: NetBSD 1.5Q NetBSD 1.5Q (MCS_WORKSTATION) #0: Thu Jan 18 00:14:50 NZDT 2001 i386
Architecture: i386
Machine: i386

	[I had a quick search of the PR database to see if this issue has
	 already been reported.  As far as I could see, it hasn't been]

	With /usr/bin/ssh not being installed suid root, rhosts/rsa
	authentication doesn't work (because the client ssh can't open its
	local private key file (/etc/ssh_host_key).

	Make sure you don't have personal RSA keys set up (in ~/.ssh/identity
	and ~/.ssh/ files); that a pair of hosts (host1/host2) are
	in each others /etc/ssh_known_hosts or ~/.ssh/known_hosts files; and
	host1 is in host2's ~/.shosts or /etc/shosts.equiv file.  You would
	now expect to be able to slogin/ssh from host1 to host2 without having
	to provide a password, but you can't.

	Figure out whether or not it is safe to install ssh setuid root.  If
	so, figure out whether we want to do so.  If answer to either is "no",
	document the fact that rhosts/rsa authentication is not supported.