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#!/usr/bin/env sh
# Filename: makepass.sh
# Purpose: Creating random passwords.
# Authors: Dennis Eriksen <d@ennis.no>
# Bug-Reports: Email <git@dnns.no>
# License: This file is licensed under the BSD 3-Clause license.
################################################################################
# This file takes randomness from /dev/urandom and turns it into random
# passwords.
#
# This particualr script is meant to be fully POSIX compatible.
################################################################################
# Copyright (c) 2018-2023 Dennis Eriksen • d@ennis.no
# makepass-function
makepass() {
MAKEPASS_WORDLIST=${MAKEPASS_WORDLIST:-/usr/share/dict/words}
# We only take one argument
[ "$#" -gt 1 ] && printf '%s\n' 'only one argument' && return 1
# if $1 is not empty and is not a number
if [ ! -z "$1" ] && ! printf '%d' "$1" >/dev/null 2>&1; then printf '%s\n' 'not a number' && return 1; fi
if [ ! -z "$1" ] && [ ! ${1:-0} -gt 0 ]; then printf '%s\n' 'not a number above 0'; return 1; fi
# Go!
len=$1
printf '%s\n' 'Normal passwords:'
i=0
while [ $i -lt 10 ]; do
_random "${len:-}" '_A-Z-a-z-0-9' true
i=$((i + 1))
done | column
printf '\n'
printf '%s\n' 'Passwords with special characters:'
i=0
while [ $i -lt 6 ]; do
_random "${len:-}" '!#$%&/()=?+-_,.;:<>[]{}|\@*^A-Z-a-z-0-9' true
i=$((i + 1))
done | column
if [ -r "${MAKEPASS_WORDLIST}" ]; then
printf '\n'
printf '%s\n' 'Passphrases:'
lines=$(wc -l < ${MAKEPASS_WORDLIST})
i=0
while [ $i -lt 5 ]; do
# shuf is the best solution here, but it is very much not portable.
#words=$(shuf -n 8 "${MAKEPASS_WORDLIST}" | tr '\n' '-' | tr -dc '_A-Z-a-z-0-9')
words=""
j=0
while [ $j -lt 8 ]; do
words="${words}-$(sed -n $(($(_RANDOM) % $lines + 1))p "${MAKEPASS_WORDLIST}" | tr -dc '_A-Z-a-z-0-9')"
j=$((j + 1))
done
printf '%s\n' "${words#-}"
i=$((i + 1))
done
fi
unset len i lines j words
return 0
}
# get random number
_RANDOM() {
N=0
while [ ! "$N" = "${N#0}" ]; do
N=$(head -n 100 /dev/urandom | tr -cd "[:digit:]" | tail -c 8)
done
printf '%s\n' "$N" && return 0
}
# Function to create random stuff
_random() (
# sh does not like leading zeroes when doing math with numbers. Let's reset until we have a number that doesn't start with 0.
# Default is a number between 8 and 44
len=${1:-$(($(_RANDOM) % (44 - 8 + 1) + 8))}
# Default to [:alnum:] if no chars are specified
chars=${2:-'[:alnum:]'}
# First-Last-Alpha - if you want the first and the last letter to be from [:alpha:]
fla=${3:-'false'}
if [ "$fla" = "true" ]; then
if [ $len -le 2 ]; then
string="$(head -n 10 /dev/urandom | tr -cd '[:alpha:]' | tail -c $len)"
else
string="$(head -n 10 /dev/urandom | tr -cd '[:alpha:]' | tail -c 1)"
string="${string}$(head -n 100 /dev/urandom | tr -cd "$chars" | tail -c $((len-2)))"
string="${string}$(head -n 10 /dev/urandom | tr -cd '[:alpha:]' | tail -c 1)"
fi
else
string="$(head -n 100 /dev/urandom | tr -cd "$chars" | tail -c $len)"
fi
printf '%s\n' "$string"
unset len chars fla string
return 0
)
makepass "${@:-}"
## END OF FILE #################################################################
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