forward traffic through ssh proxy with iptables and redsocks

configure.sh

OUTSIDE_INTERFACE=wlan0
INSIDE_INTERFACE=eth0
SSH_REMOTE_PORT=22
SSH_SOCKS_PORT=1337
REDSOCKS_PORT=12345

# set the ip address
ifconfig $INSIDE_INTERFACE 10.0.0.1 netmask 255.255.255.0

# enable ip forwarding
echo 1 > /proc/sys/net/ipv4/ip_forward

# reset iptables
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -t nat -F
iptables -F
iptables -X

# redirect local traffic, except traffic from redsocks to ssh or the ssh itself
iptables -t nat -A OUTPUT -p tcp --dport $SSH_REMOTE_PORT -j RETURN
iptables -t nat -A OUTPUT -p tcp --dport $SSH_SOCKS_PORT -j RETURN
iptables -t nat -A OUTPUT -p tcp -j REDIRECT --to-ports $REDSOCKS_PORT

# redirect traffic from inside
iptables -t nat -A PREROUTING -p tcp -j REDIRECT --to-ports $REDSOCKS_PORT

redsocks.conf

# file: /etc/redsocks.conf
# install redsocks: sudo apt-get install redsocks
# restart to apply a new config: sudo killall redsocks && sudo redsocks -c /etc/redsocks.conf

base {
        // debug: connection progress & client list on SIGUSR1
        log_debug = off;

        // info: start and end of client session
        log_info = on;

        /* possible `log' values are:
         *   stderr
         *   "file:/path/to/file"
         *   syslog:FACILITY  facility is any of "daemon", "local0"..."local7"
         */
        log = "syslog:daemon";

        // detach from console
        daemon = on;

        /* Change uid, gid and root directory, these options require root
         * privilegies on startup.
         * Note, your chroot may requre /etc/localtime if you write log to syslog.
         * Log is opened before chroot & uid changing.
         */
        user = redsocks;
        group = redsocks;
        // chroot = "/var/chroot";

        /* possible `redirector' values are:
         *   iptables   - for Linux
         *   ipf        - for FreeBSD
         *   pf         - for OpenBSD
         *   generic    - some generic redirector that MAY work
         */
        redirector = iptables;
}

redsocks {
        /* `local_ip' defaults to 127.0.0.1 for security reasons,
         * use 0.0.0.0 if you want to listen on every interface.
         * `local_*' are used as port to redirect to.
         */
        local_ip = 0.0.0.0;
        local_port = 12345;

        // `ip' and `port' are IP and tcp-port of proxy-server
        // You can also use hostname instead of IP, only one (random)
        // address of multihomed host will be used.
        ip = 127.0.0.1;
        port = 1337;


        // known types: socks4, socks5, http-connect, http-relay
        type = socks5;

        // login = "foobar";
        // password = "baz";
}