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#!/bin/bash
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#
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# lists the names of all ssh public keys in the authorized_key files of all general users and of root
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#
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_l="/etc/login.defs"
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_p="/etc/passwd"
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8
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## get mini UID limit ##
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l=$(grep "^UID_MIN" $_l)
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11
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## get max UID limit ##
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l1=$(grep "^UID_MAX" $_l)
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14
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## use awk to print if UID >= $MIN and UID <= $MAX and shell is not /sbin/nologin ##
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users=(`awk -F':' -v "min=${l##UID_MIN}" -v "max=${l1##UID_MAX}" '{ if ( $3 >= min && $3 <= max && $7 != "/sbin/nologin" ) print $0 }' "$_p" | sed -r 's/^([[:alnum:]]*).*/\1/g'`)
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cnt=${#users[@]}
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users[$cnt]="root"
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for u in "${users[@]}"
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do
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home_dir=$(echo "echo ~$u" | bash)
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if [[ -r $home_dir/.ssh/authorized_keys ]]
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then
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echo "general user '$u'"
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cat $home_dir/.ssh/authorized_keys | sed -r "s/^([[:alnum:][:punct:]]*) [[:alnum:][:punct:]]* (.*)/ \1: \2/g"
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fi
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done
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