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Merge pull request #1911 from Security-Onion-Solutions/feature/ssh-harden-script

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[feat] Add ssh-harden script
This commit is contained in:
William Wernert
2020-11-13 09:00:07 -05:00
committed by GitHub
parent 52e909007f 2f27b6f2fa
commit 8a7ff3260d
1 changed files with 49 additions and 0 deletions
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49
salt/common/tools/sbin/so-ssh-harden Normal file
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#!/bin/bash
. /usr/sbin/so-common
if [[ $1 =~ ^(q|--quiet) ]]; then
quiet=true
fi
print_sshd_t() {
local string=$1
local state=$2
echo "${state}:"
sshd -T | grep "^${string}"
}
if ! [[ $quiet ]]; then print_sshd_t "ciphers" "Before"; fi
sshd -T | grep "^ciphers" | sed -e "s/\(3des-cbc\|aes128-cbc\|aes192-cbc\|aes256-cbc\|arcfour\|arcfour128\|arcfour256\|blowfish-cbc\|cast128-cbc\|rijndael-cbc@lysator.liu.se\)\,\?//g" >> /etc/ssh/sshd_config
if ! [[ $quiet ]]; then
print_sshd_t "ciphers" "After"
echo ""
fi
if ! [[ $quiet ]]; then print_sshd_t "kexalgorithms" "Before"; fi
sshd -T | grep "^kexalgorithms" | sed -e "s/\(diffie-hellman-group14-sha1\|ecdh-sha2-nistp256\|diffie-hellman-group-exchange-sha256\|diffie-hellman-group1-sha1\|diffie-hellman-group-exchange-sha1\|ecdh-sha2-nistp521\|ecdh-sha2-nistp384\)\,\?//g" >> /etc/ssh/sshd_config
if ! [[ $quiet ]]; then
print_sshd_t "kexalgorithms" "After"
echo ""
fi
if ! [[ $quiet ]]; then print_sshd_t "macs" "Before"; fi
sshd -T | grep "^macs" | sed -e "s/\(hmac-sha2-512,\|umac-128@openssh.com,\|hmac-sha2-256,\|umac-64@openssh.com,\|hmac-sha1,\|hmac-sha1-etm@openssh.com,\|umac-64-etm@openssh.com,\|hmac-sha1\)//g" >> /etc/ssh/sshd_config
if ! [[ $quiet ]]; then
print_sshd_t "macs" "After"
echo ""
fi
if ! [[ $quiet ]]; then print_sshd_t "hostkeyalgorithms" "Before"; fi
sshd -T | grep "^hostkeyalgorithms" | sed "s|ecdsa-sha2-nistp256,||g" | sed "s|ssh-rsa,||g" >> /etc/ssh/sshd_config
if ! [[ $quiet ]]; then
print_sshd_t "hostkeyalgorithms" "After"
echo ""
fi
{% if grains['os'] != 'CentOS' %}
echo "----"
echo "[ WARNING ] Any new ssh sessions will need to remove and reaccept the ECDSA key for this server before reconnecting."
echo "----"
{% endif %}