myvesta/bin/v-check-fs-permission

#!/bin/bash
# info: open file
# options: USER FILE
#
# The function opens/reads files on the file system

user=$1
src=$2

# Checking arguments
if [ -z "$src" ]; then
    echo "Usage: USER FILE"
    exit 1
fi

# Checking vesta user
if [ ! -e "$VESTA/data/users/$user" ]; then
    echo "Error: vesta user $user doesn't exist"
    exit 3
fi

# Checking user homedir
homedir=$(grep "^$user:" /etc/passwd | cut -f 6 -d :)
if [ -z $homedir ]; then
    echo "Error: user home directory doesn't exist"
    exit 12
fi

# Checking path
if [ ! -z "$src" ]; then
    rpath=$(readlink -f "$src")
    if [ -z "$(echo $rpath |egrep "^/tmp|^$homedir")" ]; then
        echo "Error: invalid source path $user $src"
        exit 2
    fi
fi

# Checking if file has readable permission
sudo -u $user ls "$src" > /dev/null 2>&1
if [ $? -ne 0 ]; then
    echo "Error: can't read $src"
    exit 1
fi

# Exiting
exit