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bf5e73bb50ab4eb810eb7e13dcc685f293936661
Scripts_MiSTer/security_fixes.sh
Locutus73 bf5e73bb50 Version 1.2.10 - Testing Internet with github.com 
Testing Internet connectivity with github.com instead of google.com; refined the check for standard root password.
2019-06-10 10:24:03 +02:00

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#!/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 <http://www.gnu.org/licenses/>.
# Copyright 2019 Alessandro "Locutus73" Miele
# You can download the latest version of this script from:
# https://github.com/MiSTer-devel/Scripts_MiSTer
# Version 1.2.10 - 2019-06-03 - Testing Internet connectivity with github.com instead of google.com; refined the check for standard root password.
# Version 1.2.9 - 2019-06-03 - Refined the check for standard root password.
# 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 "\(^9104842aa3318a956e51a081d052d2ee \)\|\(^18de777543175ec29c71ebf177590199 \)\|\(^b136a9bff6f6f09feb2f30e12be37e22 \)\|\(^beca3beae21066c49e2f11d13fe68342 \)\|\(^8fe03c31a7fcc77d0af7177bd1f84825 \)\|\(^dba15e7cbfe81723120d89dba1cb6b91 \)\|\(^6b0cbc28900d54dc8517793507fd70f4 \)\|\(^62c14fc8d7fcb2e776f44302094c2ccd \)\|\(^c71576bf3b576b79ee29bf6e4f0ea822 \)"
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://github.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
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