#!/bin/bash # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program. If not, see . # Copyright 2019 Alessandro "Locutus73" Miele # You can download the latest version of this script from: # https://github.com/MiSTer-devel/Scripts_MiSTer # Version 1.2.8 - 2019-05-27 - Refined the check for standard root password. # Version 1.2.7 - 2019-05-25 - Refined the check for standard root password. # Version 1.2.6 - 2019-05-11 - Refined the check for standard root password. # Version 1.2.5 - 2019-05-02 - Code review by makigumo, now the script runs from any terminal, not only SSH, thank you very much. # Version 1.2.4 - 2019-04-08 - Refined the check for standard root password. # Version 1.2.3 - 2019-04-04 - Refined the check for standard root password. # Version 1.2.2 - 2019-04-03 - Updated openssl deb package URL. # Version 1.2.1 - 2019-02-06 - Refined the check for standard root password. # Version 1.2 - 2019-02-06 - Added security fix for Samba minimum allowed protocol. # Version 1.1.1 - 2019-02-06 - Changed the name of the repository Kernel file to zImage_dtb_socfpga-4.5. # Version 1.1 - 2019-02-06 - Checking current Kernel release is 4.5.0-socfpga-r1 before updating it for firewalling/iptables support. # Version 1.0.1 - 2019-02-05 - Cosmetic changes. # Version 1.0 - 2019-02-02 - First commit echo "" if [ "$(uname -n)" != "MiSTer" ] then echo "This script must be run" echo "on a MiSTer system." exit 1 fi if [[ ! (-t 0 && -t 1 && -t 2) ]] then echo "This script must be run" echo "from a SSH/UART terminal" echo "because it will ask" echo "some questions." exit 2 fi if (( $EUID != 0 )); then echo "This script must be run as root." exit 3 fi if cat /etc/shadow | grep -o "^root:[^:]*" | md5sum | grep -q "\(^9104842aa3318a956e51a081d052d2ee \)\|\(^18de777543175ec29c71ebf177590199 \)\|\(^b136a9bff6f6f09feb2f30e12be37e22 \)\|\(^beca3beae21066c49e2f11d13fe68342 \)\|\(^8fe03c31a7fcc77d0af7177bd1f84825 \)\|\(^dba15e7cbfe81723120d89dba1cb6b91 \)\|\(^6b0cbc28900d54dc8517793507fd70f4 \)" then echo "root password is the original one from" echo "the SD-Installer; it should be changed." read -p "Do you want me to fix it?? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) until passwd root do echo "Password not set, try again." sleep 1 done sync echo "root password succesfully changed." ;; esac else echo "root password has already been changed." fi echo "" curl -q https://google.com &>/dev/null case $? in 0) echo "CA certificates seem to work, no fix will be applied." ;; 60) read -p "CA certificates need to be fixed, do you want me to fix them? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) if (( $(ls -A /etc/ssl/certs| wc -l) > 0 )) then echo "/etc/ssl/certs is not empty, please backup its content first and then empty it." read -p "Do you want me to empty /etc/ssl/certs? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) rm /etc/ssl/certs/* ;; *) exit 4 ;; esac fi if ! which "openssl" &>/dev/null then echo "Downloading openssl" curl http://security-cdn.debian.org/debian-security/pool/updates/main/o/openssl/openssl_1.0.1t-1+deb8u11_armhf.deb -o /tmp/openssl_1.0.1t-1+deb8u11_armhf.deb ar p /tmp/openssl_1.0.1t-1+deb8u11_armhf.deb data.tar.xz | tar xJ --strip-components=3 -C "/media/fat/linux" ./usr/bin/openssl rm /tmp/openssl_1.0.1t-1+deb8u11_armhf.deb fi echo "Downloading and processing https://curl.haxx.se/ca/cacert.pem into /etc/ssl/certs;" echo "this may take some time..." curl -k "https://curl.haxx.se/ca/cacert.pem"|awk 'split_after==1{n++;split_after=0} /-----END CERTIFICATE-----/ {split_after=1} {if(length($0) > 0) print > "/etc/ssl/certs/cert" n ".pem"}' for PEM in /etc/ssl/certs/*.pem; do mv "$PEM" "$(dirname "$PEM")/$(cat "$PEM" | grep -m 1 '^[^#]').pem"; done for PEM in /etc/ssl/certs/*.pem; do for HASH in $(openssl x509 -subject_hash_old -hash -noout -in "$PEM" 2>/dev/null); do ln -s "$(basename "$PEM")" "$(dirname "$PEM")/$HASH.0"; done; done sync echo "CA certificates have been successfully fixed." ;; esac ;; *) echo "No Internet connection, please try again later." ;; esac echo "" if [ "$(cat /etc/ssh/ssh_host_rsa_key.pub | md5sum)" == "79f59093c55740abc8bcf6aa8edc9577 -" ] then echo "SSH host keys are the original ones which came" echo "with the SD-Installer; they should be regenerated." read -p "Do you want me to fix them? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) echo "Generating new SSH host keys." echo "Next time you connect through SSH or SCP" echo "your client will warn you MiSTer host keys" echo "don't match to the cached ones: it's normal," echo "it's the whole point of the procedure." echo "Please say YES to PuTTY, UPDATE to WinSCP or" echo "run something like \"ssh-keygen -R MiSTer\"" echo "on your Linux/BSD/OSX machine." rm /etc/ssh/ssh_host_* echo "Creating new SSH host keys; this may take some time..." ssh-keygen -A sync echo "SSH host keys have been successfully fixed." ;; esac else echo "SSH host keys seem to be already regenerated, no fix will be applied." fi echo "" if [ -f /etc/init.d/S50sshd ]; then echo "SSH daemon is active at startup;" echo "it should be inactive by default" echo "and manually activated when needed" echo "(i.e. using auxillary ssh_on.sh)." read -p "Do you want me to fix it?? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) mv /etc/init.d/S50sshd /etc/init.d/_S50sshd > /dev/null 2>&1 if [ -f /media/fat/linux/iptables.up.rules ] then sed -e '/--dport 22 /s/^#*/#/g' -i /media/fat/linux/iptables.up.rules fi sync echo "Now SSH is inactive at startup." ;; esac else echo "SSH daemon is correctly inactive at startup." fi echo "" if [ -f /etc/init.d/S50proftpd ]; then echo "FTP daemon is active at startup;" echo "it should be inactive by default" echo "and manually activated when needed" echo "(i.e. using auxillary ftp_on.sh)." read -p "Do you want me to fix it?? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) mv /etc/init.d/S50proftpd /etc/init.d/_S50proftpd > /dev/null 2>&1 if [ -f /media/fat/linux/iptables.up.rules ] then sed -e '/--dport 21 /s/^#*/#/g' -i /media/fat/linux/iptables.up.rules fi sync echo "Now FTP is inactive at startup." ;; esac else echo "FTP daemon is correctly inactive at startup." fi echo "" if [ -f /etc/init.d/S91smb ]; then echo "Samba daemon is active at startup;" echo "it should be inactive by default" echo "and manually activated when needed" echo "(i.e. using auxillary ssh_on.sh)." read -p "Do you want me to fix it?? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) mv /etc/init.d/S91smb /etc/init.d/_S91smb > /dev/null 2>&1 if [ -f /media/fat/linux/iptables.up.rules ] then sed -e '/--dport 137 /s/^#*/#/g' -i /media/fat/linux/iptables.up.rules sed -e '/--dport 138 /s/^#*/#/g' -i /media/fat/linux/iptables.up.rules sed -e '/--dport 139 /s/^#*/#/g' -i /media/fat/linux/iptables.up.rules sed -e '/--dport 445 /s/^#*/#/g' -i /media/fat/linux/iptables.up.rules fi sync echo "Now Samba is inactive at startup." ;; *) if [ ! -f /media/fat/linux/samba.sh ] then echo "Samba will try to activate at startup, but it won't" echo "because you have still to manually rename /media/fat/linux/_samba.sh" echo "to /media/fat/linux/samba.sh and customize it." fi ;; esac else echo "Samba daemon is correctly inactive at startup." fi echo "" if ! cat /etc/samba/smb.conf | grep -q "min protocol" then echo "Samba minimum allowed protocol isn't configured;" echo "it should be configured at least for SMB2". read -p "Do you want me to fix it?? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) sed '/\[global\]/a\\n min protocol = SMB2\n' -i /etc/samba/smb.conf sync echo "Now Samba is configured with \"min protocol = SMB2\"." ;; *) ;; esac else echo "Samba minimum allowed protocol is already configured." cat /etc/samba/smb.conf | grep "min protocol" echo "Please be sure it's at least SMB2." fi echo "" if { ! iptables -L > /dev/null 2>&1; } || [ ! -f /media/fat/linux/iptables.up.rules ] || [ ! -f /etc/network/if-pre-up.d/iptables ] then FIREWALL_KERNEL="false" echo "Firewall is not enabled and/or configured;" echo "it should be active letting only active" echo "daemons to be reached from the outside." read -p "Do you want me to fix it?? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) if iptables -L > /dev/null 2>&1 then FIREWALL_KERNEL="true" else echo "The current Kernel doesn't support firewalling (iptables)." read -p "Do you want me to download and install a Kernel with firewalling support? [y|n]" -n 1 -r echo "" case "$REPLY" in y|Y) if [ "$(uname -r)" == "4.5.0-socfpga-r1" ] then curl -L "https://github.com/MiSTer-devel/Scripts_MiSTer/blob/master/firewall-kernel/zImage_dtb_socfpga-4.5?raw=true" -o "/media/fat/linux/zImage_dtb.new" case $? in 0) if md5sum /media/fat/linux/zImage_dtb.new | grep -q "^e8a1be0c17a0b6487f6291e5320fd410 " then mv /media/fat/linux/zImage_dtb /media/fat/linux/zImage_dtb.old mv /media/fat/linux/zImage_dtb.new /media/fat/linux/zImage_dtb sync FIREWALL_KERNEL="true" else rm /media/fat/linux/zImage_dtb.new > /dev/null 2>&1 echo "Something went wrong with the Kernel download so it was deleted." fi ;; 60) echo "===============================================================" echo "CA certificates need to be fixed before downloading the Kernel." echo "Please run this script again to fix this." echo "===============================================================" ;; *) rm /media/fat/linux/zImage_dtb.new > /dev/null 2>&1 echo "No Internet connection, please try again later." ;; esac else echo "Current Kernel release is $(uname -r), only 4.5.0-socfpga-r1 is supported for now." fi ;; *) echo "You can't enable the Firewall withouth a Kernel supporting it." echo "Please rerun rerunt this script if you want to enable the Firewall." ;; esac fi if [ $FIREWALL_KERNEL == "true" ] then if [ ! -f /media/fat/linux/iptables.up.rules ] then IPTABLES_UP_RULES="*filter" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -i lo -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# Accepts all established inbound connections" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# Allows all outbound traffic" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# You could modify this to only allow certain traffic" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A OUTPUT -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# Allows SSH connections" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# The --dport number is the same as in /etc/ssh/sshd_config" if [ -f /etc/init.d/S50sshd ] then IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT" else IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"#-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT" fi IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# Now you should read up on iptables rules and consider whether ssh access" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# for everyone is really desired. Most likely you will only allow access from certain IPs." IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# Allows FTP connections" if [ -f /etc/init.d/S50proftpd ] then IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -p tcp -m state --state NEW --dport 21 -j ACCEPT" else IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"#-A INPUT -p tcp -m state --state NEW --dport 21 -j ACCEPT" fi IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# Allows Samba connections" if [ -f /etc/init.d/S91smb ] then IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -p udp -m state --state NEW --dport 137 -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -p udp -m state --state NEW --dport 138 -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -p tcp -m state --state NEW --dport 139 -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -p tcp -m state --state NEW --dport 445 -j ACCEPT" else IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"#-A INPUT -p udp -m state --state NEW --dport 137 -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"#-A INPUT -p udp -m state --state NEW --dport 138 -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"#-A INPUT -p tcp -m state --state NEW --dport 139 -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"#-A INPUT -p tcp -m state --state NEW --dport 445 -j ACCEPT" fi IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# Allow ping" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# note that blocking other types of icmp packets is considered a bad idea by some" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# remove -m icmp --icmp-type 8 from this line to allow all kinds of icmp:" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# https://security.stackexchange.com/questions/22711" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# log iptables denied calls (access via 'dmesg' command)" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -m limit --limit 5/min -j LOG --log-prefix \"iptables denied: \" --log-level 7" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"# Reject all other inbound - default deny unless explicitly allowed policy:" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A INPUT -j REJECT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"-A FORWARD -j REJECT" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"" IPTABLES_UP_RULES=$IPTABLES_UP_RULES$'\n'"COMMIT" echo "$IPTABLES_UP_RULES" > /media/fat/linux/iptables.up.rules fi if [ ! -f /etc/network/if-pre-up.d/iptables ] then echo "#!/bin/bash"$'\n'"iptables-restore < /media/fat/linux/iptables.up.rules" > /etc/network/if-pre-up.d/iptables chmod +x /etc/network/if-pre-up.d/iptables fi sync echo "Now Firewall is active at startup." else echo "Firewall is not active at startup since the current Kernel doesn't support it." fi ;; esac else echo "Firewall is correctly active and configured." fi echo "" echo "Done!" echo "You can reboot now for actually applying changes." exit 0