Setting a random password for guest wifi - XIYO/asuswrt-merlin.ng-kr GitHub Wiki

#!/bin/sh

FROM="[email protected]"
AUTH="[email protected]"
PASS="password"
FROMNAME="Asus Router"
TO="[email protected] [email protected]"

# default password based on date if we cannot create one elsewhere
datepasswd=`date +"%A%B%d"`


############################################################################
#
#   getrandomphrase - uses a list of known phrases in a file
#                   - phrase needs to be min 7 chars long
#                   - combines this with a random number between 0 and 999
#
############################################################################

getrandomphrase () {
    if [ -f /jffs/scripts/rpg-phrases.txt ]; then
        phrasecount=`wc -l /jffs/scripts/rpg-phrases.txt | cut -d " " -f 1`
        if [ $phrasecount == 0 ]; then
            # file is empty
            phrasepasswd=$datepasswd
        else
            randomnumber=`tr -cd 0-9 </dev/urandom | head -c 7 | sed 's/^0*//'`
            if [ $randomnumber == "" ]; then
                # cannot get a random number, bailing
                phrasepasswd=$datepasswd
            else
                phrasetext=`sed -n $(( $randomnumber % $phrasecount + 1 ))p /jffs/scripts/rpg-phrases.txt`
                if [ $phrasetext == "" ]; then
                    # blank lines in file, bailing  
                    phrasepasswd=$datepasswd 
                else
                    if [ ${#phrasetext} -lt 7 ]; then
                        # phrase is too short to make a valid password 
                        phrasepasswd=$datepasswd
                    else
                        # we have a phrase now get the three digit number
                        randomnumber=`tr -cd 0-9 </dev/urandom | head -c 7 | sed 's/^0*//'`
                        if [ $randomnumber == "" ]; then
                            # cannot get a random number, bailing
                            phrasepasswd=$datepasswd
                        else
                            phrasenum=`printf "%03d" $(( $randomnumber % 1000 ))`
                            phrasepasswd=$phrasetext$phrasenum
                        fi
                    fi
                fi
            fi
        fi
    else
        # file does not exist 
        phrasepasswd=$datepasswd
    fi
}


############################################################################
#
#   getrandopenssl - uses openssl rand function to create a password
#
############################################################################

getrandopenssl () {
    phrasepasswd=`openssl rand -base64 8`
    if [ $phrasepasswd == "" ]; then
        # we were unable to get something from openssl 
        phrasepasswd=$datepasswd
    fi
}


############################################################################
#
#   getpasswdme - uses passwd.me api to get random password
#               - needs curl to be installed 
#
############################################################################

getpasswdme () {
    ping -c 1 8.8.8.8
    if [ $? == 0 ]; then
        phrasepasswd=`curl -k "https://passwd.me/api/1.0/get_password.txt?type=pronounceable&length=12&charset=LOWERCASEALPHANUMERIC"`
        if [ $phrasepasswd == "" ]; then
            # we were unable to get something from passwd.me
            phrasepasswd=$datepasswd
        fi
    else
        # no network access at this time
        phrasepasswd=$datepasswd
    fi
}


# Now call the function we want to use 

getrandomphrase

# getrandopenssl

# getpasswdme


# log what we have done
logger -t $(basename $0) "Today's Guest1 password is :" $phrasepasswd

# nvram settings for the three guest 2.4 networks
nvram set wl0.1_wpa_psk=$phrasepasswd
nvram set wl0.2_wpa_psk=$datepasswd
nvram set wl0.3_wpa_psk=$datepasswd

# nvram settings for the three guest 5.0 networks
nvram set wl1.1_wpa_psk=$phrasepasswd
nvram set wl1.2_wpa_psk=$datepasswd
nvram set wl1.3_wpa_psk=$datepasswd

# passwords have been changed but we need to restart the wifi for it to pick them up
service restart_wireless

# now send out the email
echo "Subject: Guest network password notification" >/tmp/mail.txt
echo "From: \\"$FROMNAME\\"<$FROM>" >>/tmp/mail.txt
echo "Date: `date -R`" >>/tmp/mail.txt
echo "" >>/tmp/mail.txt
echo "Today's guest network password is : $phrasepasswd" >>/tmp/mail.txt
echo "" >>/tmp/mail.txt

cat /tmp/mail.txt | sendmail -H"exec openssl s_client -quiet \
-CAfile /jffs/configs/Equifax_Secure_Certificate_Authority.pem \
-connect smtp.gmail.com:587 -tls1 -starttls smtp" \
-f"$FROM" \
-au"$AUTH" -ap"$PASS" $TO 

rm /tmp/mail.txt

#!/bin/sh
cru a ResetGuestPassword "0 4 * * * /jffs/scripts/rpg-passgen.sh"

#!/bin/sh
sh /jffs/scripts/rpg-passgen.sh