perform strict ownership and modes checks for ~/.ssh/config files,
as these can be used to execute arbitrary programs; ok markus@
NB. ssh will now exit when it detects a config with poor permissions
+ - djm@cvs.openbsd.org 2004/04/19 13:02:40
+ [ssh.1 ssh_config.5]
+ document strict permission checks on ~/.ssh/config; prompted by,
+ with & ok jmc@
- (djm) [openbsd-compat/sys-queue.h] Sync with OpenBSD, needed for above change
20040419