31ec93e58
Eric Andersen
2004-09-23
Subject
Add some notes on how to make telnetd actually work
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networking/Config.in+36 -2
| @@ -492,11 +492,45 @@ config CONFIG_FEATURE_TELNET_AUTOLOGIN | |
| config CONFIG_TELNETD | |
| bool "telnetd" | |
| default n | |
| + | select CONFIG_LOGIN |
| help | |
| A daemon for the TELNET protocol, allowing you to log onto the host | |
| running the daemon. Please keep in mind that the TELNET protocol | |
| - | sends passwords in plain text. If you can't afford the space for |
| - | any SSH daemon and you trust your network, you may say 'y' here. |
| + | sends passwords in plain text. If you can't afford the space for an |
| + | SSH daemon and you trust your network, you may say 'y' here. As a |
| + | more secure alternative, you should seriously consider installing the |
| + | very small Dropbear SSH daemon instead: |
| + | http://matt.ucc.asn.au/dropbear/dropbear.html |
| + | |
| + | Note that for busybox telnetd to work you need several things: |
| + | First of all, your kernel needs: |
| + | CONFIG_UNIX98_PTYS=y |
| + | CONFIG_DEVPTS_FS=y |
| + | |
| + | Next, you need a /dev/pts directory on your root filesystem: |
| + | |
| + | $ ls -ld /dev/pts |
| + | drwxr-xr-x 2 root root 0 Sep 23 13:21 /dev/pts/ |
| + | |
| + | Next you need the pseudo terminal master multiplexer /dev/ptmx: |
| + | |
| + | $ ls -la /dev/ptmx |
| + | crw-rw-rw- 1 root tty 5, 2 Sep 23 13:55 /dev/ptmx |
| + | |
| + | Any /dev/ttyp[0-9]* files you may have can be removed. |
| + | Next, you need to mount the devpts filesystem on /dev/pts using: |
| + | |
| + | mount -t devpts devpts /dev/pts |
| + | |
| + | You need to be sure that Busybox has CONFIG_LOGIN and |
| + | CONFIG_FEATURE_SUID enabled. And finally, you should make |
| + | certain that Busybox has been installed setuid root: |
| + | |
| + | chown root.root /bin/busybox |
| + | chmod 4755 /bin/busybox |
| + | |
| + | with all that done, telnetd _should_ work.... |
| + | |
| config CONFIG_FEATURE_TELNETD_INETD | |
| bool " Support call from inetd only" | |