Christopher Key wrote:
Hello,
I've come upon OpenSSH bug 472, whereby scp refuses usernames
containing a '#' character, dieing with 'invalid user name'. Both
rsync and ssh accept such usernames, and after looking at
/usr/src/crypto/openssh/scp.c, it would appear that scp also allows
such usernames for the source, but not the destination.
I've several questions:
1) Is there any specific reason why scp behaves like this, and
specifically why does it only attempt to validate the destination user
name and not the source?
2) Assuming it is safe to drop the username validation, I can quite
happily modify the code as appropriate. However, I'm not sure how to
rebuild and update with minimum fuss. I really only need to rebuild
scp and install the new binary, can I do this easily without a full
make buildworld; make installworld?
3) Assuming that there's no additional reason not to remove the
username validation, how should I go about submitting a change request
to get this modification made in CURRENT, and MFCed as appropriate?
Kind Regards,
Chris Key
I don't know whether any of this is a good idea (there might be a very
good reason why it is programmed this way, generally stuff in 'secure'
is rather sensitive), but to answer your second question, you would
simply do:
# cd /usr/src/secure/usr.bin/scp
# make
# make install
Since OpenSSH comes from OpenBSD, it may be worth trying asking someone
over there too.
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