Created
March 10, 2016 11:56
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Host SSH key fingerprints for all key ciphers
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#!/bin/bash | |
# Not my own creation, copied from: | |
# http://superuser.com/questions/929566/sha256-ssh-fingerprint-given-by-the-client-but-only-md5-fingerprint-known-for-se | |
# standard sshd config path | |
SSHD_CONFIG=/etc/ssh/sshd_config | |
# helper functions | |
function tablize { | |
awk '{printf("| %-7s | %-7s | %-47s |\n", $1, $2, $3)}' | |
} | |
LINE="+---------+---------+-------------------------------------------------+" | |
# header | |
echo $LINE | |
echo "Cipher" "Algo" "Fingerprint" | tablize | |
echo $LINE | |
# fingerprints | |
for host_key in $(awk '/^HostKey/ {sub(/^HostKey\s+/,"");print $0".pub"};' $SSHD_CONFIG); do | |
cipher=$(echo $host_key | sed -r 's/^.*ssh_host_([^_]+)_key\.pub$/\1/'| tr '[a-z]' '[A-Z]') | |
if [[ -f "$host_key" ]]; then | |
md5=$(ssh-keygen -l -f $host_key | awk '{print $2}') | |
sha256=$(awk '{print $2}' $host_key | base64 -d | sha256sum -b | awk '{print $1}' | xxd -r -p | base64) | |
echo $cipher MD5 $md5 | tablize | |
echo $cipher SHA-256 $sha256 | tablize | |
echo $LINE | |
fi | |
done |
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