WRTU54G » History » Revision 6
Revision 5 (laforge, 02/19/2016 10:47 PM) → Revision 6/11 (laforge, 02/19/2016 10:47 PM)
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= Information on the WRTU54G UMA TA =
== Getting shell / console access ==
The easiest part is to flash a modified firmware image that removes the root password from the /etc/passwd file in the squashfs.
You can then access the serial console and log in as root without password.
== Changing the SEGW / GANC address ==
On the shell of the device, change to the /nv directory and edit the two lines in rc.conf for UMA_SGW and UMA_UNC to:
{{{
UMA_SGW="my.segw.host.name"
UMA_UNC="my.unc.host.name"
}}}
Then, use the {{{rawaccess {{{raaccess -a rc.conf}}} command to store the changes to flash and reboot the system.
== Enabling more logging ==
In /nv/rc.conf:
{{{
LOG_ENABLE="1"
UMALOG_ENABLE="on"
UMA_LOG_SIZE="1"
}}}
Then, use the {{{rawaccess -a rc.conf}}} command to store the changes to flash and reboot the system.
== Adding a new CA Certificate ==
While modifying the firmware, add your new CA root certificate in DER format to /ramdisk_copy/etc/kineto/ and then add the filename
and path into a new line in /ramdisk_copy/etc/kineto/init_ike.cfg, like this:
{{{
ike ca /etc/kineto/my_new_ca.der
}}}
Furthermore, edit /etc/rc.d/init.d/umaset and /etc/rc.d/init.d/RJ11_recovery to each include a line like this:
{{{
echo "ike ca /etc/kineto/my_new_ca.der" >> $IKE_CONF
}}}
== Enabling telnet ==
Using the toolchain included in the Linksys WRTU54G GPL release, you can cross-compile utelnetd for a compatible uclibc:
{{{
./utelnetd-0.1.11 $ make CC=mipsel-linux-gcc
mipsel-linux-gcc -I. -pipe -DSHELLPATH=\"/bin/login\" -Wall -fomit-frame-pointer -c -o utelnetd.o utelnetd.c
mipsel-linux-gcc -I. -pipe -DSHELLPATH=\"/bin/login\" -Wall -fomit-frame-pointer utelnetd.o -o utelnetd
strip --remove-section=.comment --remove-section=.note utelnetd
./utelnetd-0.1.11 $
}}}
You can then include this utelnetd utelnted binary into the squashfs image to /usr/sbin/utelnted.
Furthermore, you have to edit /etc/rc.d/rc.proprietary and change the line
{{{
[ "`uname -ar | grep diag`" ] && /usr/sbin/utelnetd&
}}}
into
{{{
usr/sbin/utelnetd&
}}}
to unconditionally start the telnet daemon at every boot. Alternatively, you can set
{{{
hostname="diag"
}}}
in /nv/rc.conf.
= Setting up a SEGW =
The SEGW needs to
* allocate a virtual IP to the remote end from a local pool
* use EAP-SIM to authenticate the peer, using tuples (IMSI/RAND/SRES/Kc)
* authenticate itself using a certificate that has been signed by the CA certificate installed on the WRT54U
* provide at least one DNS server via IKEv2 attributes to the peer
== make sure your private key is not PKCS8 ==
The default CA.pl script of opensl generates private keys in PKCS#8 format, which is not supported
by charon of OpenSWAN. you have to convert the PKCS#8 into raw RSA files like this:
{{{
openssl pkcs8 -nocrypt < my_privatekey.pem > my_privatekey_raw.pem
}}}
