#!/bin/bash
# info: check user hash
# options: USER HASH [IP]
#
# example: v-check-user-hash admin CN5JY6SMEyNGnyCuvmK5z4r7gtHAC4mRZ...
#
# This function verifies user hash

#----------------------------------------------------------#
#                Variables & Functions                     #
#----------------------------------------------------------#

# Argument definition
user=$1
hash=$2
HIDE=2
ip46=${3-127.0.0.1}

# Includes
# shellcheck source=/etc/hestiacp/hestia.conf
source /etc/hestiacp/hestia.conf
# shellcheck source=/usr/local/hestia/func/main.sh
source $HESTIA/func/main.sh
# load config file
source_conf "$HESTIA/conf/hestia.conf"

time_n_date=$(date +'%T %F')
time=$(echo "$time_n_date" | cut -f 1 -d \ )
date=$(echo "$time_n_date" | cut -f 2 -d \ )

#----------------------------------------------------------#
#                    Verifications                         #
#----------------------------------------------------------#

check_args '2' "$#" 'USER HASH'
is_format_valid 'user' 'ip46'

# Checking user
if [ ! -d "$HESTIA/data/users/$user" ] && [ "$user" != 'root' ]; then
	echo "Error: password missmatch"
	echo "$date $time $user $ip failed to login" >> $HESTIA/log/auth.log
	exit 9
fi

# Checking user hash
is_hash_valid

# Checking empty hash
if [[ -z "$hash" ]]; then
	echo "Error: password missmatch"
	echo "$date $time $user $ip46 failed to login" >> $HESTIA/log/auth.log
	exit 9
fi

#----------------------------------------------------------#
#                       Action                             #
#----------------------------------------------------------#

# Parsing user's salt
shadow=$(grep "^$user:" /etc/shadow | cut -f 2 -d :)

if echo "$shadow" | grep -qE '^\$[0-9a-z]+\$[^\$]+\$'; then
	salt=$(echo "$shadow" | cut -f 3 -d \$)
	method=$(echo "$shadow" | cut -f 2 -d \$)
	if [ "$method" = "y" ]; then
		method="yescrypt"
	elif [ "$method" -eq '1' ]; then
		method='md5'
	elif [ "$method" -eq '6' ]; then
		method='sha-512'
	else
		echo "Error: password missmatch"
		echo "$date $time $user $ip46 failed to login" >> $HESTIA/log/auth.log
		exit 9
	fi
else
	salt=${shadow:0:2}
	method='des'
fi

# Checking salt
if [ -z "$salt" ]; then
	echo "Error: password missmatch"
	echo "$date $time $user $ip46 failed to login" >> $HESTIA/log/auth.log
	exit 9
fi

# Comparing hashes
if [[ "$shadow" != "$hash" ]]; then
	echo "Error: password missmatch"
	echo "$date $time $user $ip46 failed to login" >> $HESTIA/log/auth.log
	exit 9
fi

#----------------------------------------------------------#
#                       Hestia                             #
#----------------------------------------------------------#

# Logging
echo "$date $time $user $ip46 successfully logged in" >> $HESTIA/log/auth.log

exit