minor rdist bug

[Jay Lepreau]

There is a minor security problem with the recommended fix to allow
rdist to propagate sticky bits: normally only root is allowed to set the
sticky bit. But with the proposed fix, if a user has a machine on which
he has root privileges, and then rdist's (as himself) a file to a
machine on which he does not have root privs, he can introduce binaries
with the sticky bit set.  No big deal, but here's a better way to fix
rdist/server.c:

1038c1038,1039
< 	    (mode & 06000) && chmod(file, mode) < 0) {
---
> 	    (mode & (06000 | (userid ? 0 : S_ISVTX))) &&
> 	    chmod(file, mode) < 0) {