Как использовать tor «Правильно» или свой torify на setgid

#!/bin/bash
#iptables_torify.bash

dns_port=9053
tor_port=9040
virt_addr="10.192.0.0/10"
non_tor="127.0.0.0/8 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 0.0.0.0/8 100.64.0.0/10 169.254.0.0/16 192.0.0.0/24 192.0.2.0/24 192.88.99.0/24 198.18.0.0/15 198.51.100.0/24 203.0.113.0/24 224.0.0.0/3"

RED='\033[0;31m'
NC='\033[0m'

if [[ "$UID" != "0" ]]; then
    echo -e "${RED}Нужен root!${NC}"
    exit 1
fi

if [[ "$1" == "add" ]]; then
    op="-A"
elif [[ "$1" == "del" ]]; then
    op="-D"
else
    echo -e "${RED}Неизвестная операция '$1'${NC}"
    exit 1
fi

if [[ "$2" == "uid" ]]; then
    if [[ ! "$3" =~ ^[0-9]+$ ]]; then
        echo -e "${RED}Неверный UID '$3'${NC}"
        exit 1
    fi
    filter="--uid-owner"
    owner="$3"
elif [[ "$2" == "gid" ]]; then
    if [[ ! "$3" =~ ^[0-9]+$ ]]; then
        echo -e "${RED}Неверный GID '$3'${NC}"
        exit 1
    fi
    filter="--gid-owner"
    owner="$3"
elif [[ "$2" == "user" ]]; then
    owner=`id -u "$3" 2>/dev/null`
    if [[ ! "$owner" =~ ^[0-9]+$ ]]; then
        echo -e "${RED}Пользователь '$3' не существует${NC}"
        exit 1
    fi
    filter="--uid-owner"
elif [[ "$2" == "group" ]]; then
    owner=`id -g "$3" 2>/dev/null`
    if [[ ! "$owner" =~ ^[0-9]+$ ]]; then
        echo -e "${RED}Пользователь '$3' не существует${NC}"
        exit 1
    fi
    filter="--gid-owner"
else
    echo -e "${RED}Неизвестный фильтр '$2'${NC}"
    exit 1
fi

iptables -t nat "$op" OUTPUT -d "$virt_addr" -p tcp -m tcp -m owner "$filter" "$owner" --tcp-flags FIN,SYN,RST,ACK SYN -j REDIRECT --to-ports "$tor_port"
iptables -t nat "$op" OUTPUT -p udp -m udp -m owner "$filter" "$owner" --dport 53 -j REDIRECT --to-ports "$dns_port"
for lan in $non_tor; do
    iptables -t nat "$op" OUTPUT -m owner "$filter" "$owner" -d "$lan" -j RETURN
done
iptables -t nat "$op" OUTPUT -m owner "$filter" "$owner" -o lo -j RETURN
iptables -t nat "$op" OUTPUT -p tcp -m tcp -m owner "$filter" "$owner" --tcp-flags FIN,SYN,RST,ACK SYN -j REDIRECT --to-ports "$tor_port"

iptables "$op" OUTPUT -m owner "$filter" "$owner" -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j ACCEPT
for lan in $non_tor; do
    iptables "$op" OUTPUT -m owner "$filter" "$owner" -d "$lan" -j ACCEPT
done
iptables "$op" OUTPUT -m owner "$filter" "$owner" -d 127.0.0.1/32 -o lo -j ACCEPT
iptables "$op" OUTPUT -m owner "$filter" "$owner" -d 127.0.0.1/32 -p tcp -m tcp --dport "$tor_port" --tcp-flags FIN,SYN,RST,ACK SYN -j ACCEPT
iptables "$op" OUTPUT -m owner "$filter" "$owner" -d 127.0.0.1/32 -p udp -m udp --dport "$dns_port" -j ACCEPT
iptables "$op" OUTPUT -m owner "$filter" "$owner" -j DROP

#/etc/tor/torrc
VirtualAddrNetworkIPv4 10.192.0.0/10
AutomapHostsOnResolve 1
TransPort 9040
DNSPort 9053

su
useradd torify -m
iptables_torify.bash add group torify
iptables-save >> "/etc/iptables/iptables.rules"
systemctl enable iptables.service
systemctl enable tor
reboot

#setgid_torify.cpp
#include <cstdlib>
#include <unistd.h>
#include <string>
#include <cstring>
#include <cassert>
#include <cstdio>

using namespace std;

string e(const char *s) {
    string res;
    for (size_t i = 0, l = strlen(s); i < l; ++i) {
        if(s[i] == '\'') res += "'\\''";
        else res.push_back(s[i]);
    }
    return res;
}

uint32_t id(const char *s) {
    FILE *p = popen(s, "r");
    assert(p);
    char ch;
    uint32_t i = 0;
    do {
        ch = fgetc(p);
        if (ch >= '0' && ch <= '9') i = i * 10 + (ch - '0');
    } while(ch != EOF);
    pclose(p);
    assert(i != 0);
    return i;
}

int main(int argc, const char *argv[]) {
    string s;
    for (int i = 1; i < argc; ++i) {
        s.push_back('\'');
        s += e(argv[i]);
        s.push_back('\'');
        if (i + 1 < argc) s.push_back(' ');
    }
    uint32_t torify_gid = id("id -g torify");
    setgid(torify_gid);
    setuid(getuid());
    if (getgid() == torify_gid)
        return system(s.c_str());
    else
        printf("setgid_torify: failed to setgid\n");
    return 1;
}

g++ setgid_torify.cpp -o setgid_torify -O2 -Wall
sudo chown root:root setgid_torify
sudo chmod 4755 setgid_torify
# Если кто не умеет