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It seems that support for tcp wrappers is not compiled into the sshd service for Mountain Lion. sshd ignores the contents of the "/etc/hosts.deny" file, that for example "denyhosts" produces. Why is this do you think, and is there some workaround? Seems like tcp wrappers have been supported forever, before Mountain Lion.
OS X Mountain Lion (10.8)
Yes denyhosts runs fine, but sshd ignores the resulting /etc/hosts.deny file. Have you tested to put in your own IP address manually in the hosts.deny file and then ssh to that address? In my case at least I'm not blocked at all. Also in the log file I see hundred of entries of ssh attempts from the same host.
Have you some special setting in sshd_config?
I'm using DenyHosts under 10.8, and it works fine.
That's a good catch. TCP Wrappers has, indeed, been removed. From what I can tell, it was never an ideal solution. It seems to have been replaced by BSD's Packet Filter. Here is a tutorial on using Packet Filter in Lion: http://krypted.com/mac-os-x/a-cheat-sheet-for-using-pf-in-os-x-lion-and-up/
Yes, libwrap has been removed. You can install it yourself, if you wish, for example using MacPorts.
This looks like the way to go, though it needs to be adapted:
I've been using DenyHosts under 10.7 as well and upon discovering that Apple didn't include the libwrap libraries in 10.8 I attempted to go the MacPorts route as well. However, has anyone found the latest OpenSSH port from MacPorts to work under 10.8? A fresh install for me results in the follow error when I attempt to ssh into the system:
sshd[38257]: fatal: ssh_sandbox_child: sandbox_init: dlopen(/usr/lib/libsandbox.1.dylib, 261): image not found [preauth]
I posted a ticket to MacPorts but so far answer/fix.
I am just looking for anyone that can confirm/deny a problem with that port. There are no user forums for MacPorts. :-(
I also look into the PF approach suggested by Linc (thanks!).
Hmmm, a quick look at the PF options and that's not going to cut it. PF only does very basic brute force analysis via "connect X times in a row in Y seconds" and your bounced. DenyHosts allows you to track IP connections and create a variety of deny rules based on the username the remote connection is attempting to use.
I consider this a really cheesy and hopefully very temporary workaround. It may not be recommended, use at your own risk, your universe may collapse into a black hole, etc., etc. But it worked. đ
If you still have a 10.7 install on another volume, you can copy the old sshd binary and missing libwrap library file to your 10.8 boot disk and run it. Quick and dirty run down (this is not detailed for those not versed in command line):
Pre) Make sure you stop the default sshd daemon via the sharing control panel. (Uncheck "Remote login.) Otherwise you will have a conflict on port 22 when you try to start the old.
1) Mount the 10.7 volume. For my example I'll call mine "Mac 10.7 HD"
2) sudo cp /Volumes/"Mac 10.7 HD"/usr/lib/libwrap.7.dylib /usr/lib/.
3) sudo cp /Volumes/"Mac 10.7 HD"/usr/sbin/sshd /usr/sbin/sshd2 (or "sshd-old" or whatever you like, just don't overwrite the exisitng sshd or you won't be able to revert later.)
4) sudo /usr/sbin/sshd2 (start the daemon)
Note you can't use the sharing control panel to control this version and if you wanted it start between reboots you would have to create a separate launchctl script for it.
Linc, another good lead, thanks. I probably should be spending my time looking around for alternatives than hacking away at my install. đ
TCP wrappers not supported in sshd?
