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Old 01-23-2014, 11:09 PM   #1
alethiophile
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sshd will not start in usbnetwork mode

I recently started trying to use usbnetwork again. (I have to reinstall the install.bin file for it periodically, because if I accidentally take the Kindle off airplane mode then a firmware update usually happens, and that undoes usbnetwork.) After reinstalling, the usbnetwork bit worked fine; however, sshd did not start. Accessing it via telnet, I found that attempting to manually start sshd yields "/mnt/us/usbnet/empty must be owned by root and not group- or world-writable".

/mnt/us/usbnet/empty, of course, exists, but is set mode 777. chmod will not work on it, because the filesystem is fat32. /mnt/us is some kind of odd bind mount of /mnt/base-us, but in the latter, umask is set to 022, and so group and world cannot write anywhere. I can't find a way to make the bind mount (fuse.fsp, whatever that is) do the same thing.

How should this be fixed? How was it ever working in the first place? Did something change?
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Old 01-23-2014, 11:39 PM   #2
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Dunno about that, but have you tried the BackDoorLock hack or An easier way to disable auto-updates?
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Old 01-24-2014, 04:25 AM   #3
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@alethiophile: I should have fixed that a good while ago, which version of USBnet are you using?
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Old 01-24-2014, 11:34 AM   #4
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Uh...'the one I downloaded when I got this Kindle', I think. The file is 'update_usbnet_0.6.N_install.bin'.

And thanks for the pointers to disabling auto-updates. I'll look into that once I get sshd fixed.
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Old 01-24-2014, 02:34 PM   #5
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@alethiophile: That is terribly old, which explains why it's not working .
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Old 01-24-2014, 06:44 PM   #6
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Okay, having installed the newest version SSH now works.

It seems to still start the telnetd, even though both USE_WIFI and USE_OPENSSH are true. How do you forestall that?
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Old 01-24-2014, 07:19 PM   #7
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@alethiophile: You don't . If it really bothers you, comment the call in the usbnetwork script.
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Old 01-25-2014, 01:04 AM   #8
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Okay. (Does the telnetd not listen on wifi, then? It seems quite the hole otherwise.)
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Old 01-25-2014, 08:21 AM   #9
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Quote:
Originally Posted by alethiophile View Post
Okay. (Does the telnetd not listen on wifi, then? It seems quite the hole otherwise.)
Did you run:
lsof | grep tel
on your machine?
What did it say about telnet sockets?

Did you try to connect via telnet over wifi?
What happened?

If you did connect over wifi, did telnetd ask you for a password?

This additional information would help us understand the problem you are seeing as a "hole".

Here is an example of the lsof output, filtered by grep, (for sshd, not telnet, and on a non-kindle machine, but the listing format will be the same):
Code:
sshd       1304       root    3u     IPv4       9587      0t0        TCP *:ssh (LISTEN)
sshd       1304       root    4u     IPv6       9589      0t0        TCP *:ssh (LISTEN)
I.E: The above machine has two network sockets open (IPv4 and IPv6) using TCP protocol, listening on all (*) address:port=ssh combinations.

If you find telnet listening on the address (or all addresses) of the Wifi interface, then check your firewall incoming (state=new) rules for the Telnet port on that Wifi interface.
Since it does the program no good to listen, if packets can't get through your firewall.

Last edited by knc1; 01-25-2014 at 08:33 AM.
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Old 01-25-2014, 10:36 AM   #10
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@alethiophile: The telnet port is behind the default firewall over WiFi .
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