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#!rsc
# RouterOS script: daily-psk
# Copyright (c) 2013-2019 Christian Hesse <mail@eworm.de>
# Michael Gisbers <michael@gisbers.de>
#
# update daily PSK (pre shared key)
:global Identity;
:global DailyPskMatchComment;
:global UrlEncode;
:global SendNotification;
:local Seen [ :toarray "" ];
# return pseudo-random string for PSK
:local GeneratePSK do={
:local Date [ :tostr $1 ];
:global DailyPskSecrets;
:local Months { "jan"; "feb"; "mar"; "apr"; "may"; "jun";
"jul"; "aug"; "sep"; "oct"; "nov"; "dec" };
:local Month [ :pick $Date 0 3 ];
:local Day [ :tonum [ :pick $Date 4 6 ] ];
:local Year [ :pick $Date 7 11 ];
:for MIndex from=0 to=[ :len $Months ] do={
:if ($Months->$MIndex = $Month) do={
:set Month ($MIndex + 1);
}
}
:local A ((14 - $Month) / 12);
:local B ($Year - $A);
:local C ($Month + 12 * $A - 2);
:local WeekDay (7000 + $Day + $B + ($B / 4) - ($B / 100) + ($B / 400) + ((31 * $C) / 12));
:set WeekDay ($WeekDay - (($WeekDay / 7) * 7));
:return (($DailyPskSecrets->0->($Day - 1)) . \
($DailyPskSecrets->1->($Month - 1)) . \
($DailyPskSecrets->2->$WeekDay));
}
:local Date [ / system clock get date ];
:local NewPsk [ $GeneratePSK $Date ];
:foreach AccList in=[ / interface wireless access-list find where comment~$DailyPskMatchComment ] do={
:local IntName [ / interface wireless access-list get $AccList interface ];
:local Interface [ / interface wireless find where name=$IntName disabled=no ];
:local Ssid [ / interface wireless get $IntName ssid ];
:local OldPsk [ / interface wireless access-list get $AccList private-pre-shared-key ];
:local Skip 0;
:if ($NewPsk != $OldPsk) do={
:log info ("Updating daily PSK for " . $IntName . " to " . $NewPsk . " (was " . $OldPsk . ")");
/ interface wireless access-list set $AccList private-pre-shared-key=$NewPsk;
:if ([ :len $Interface ] = 1) do={
:foreach SeenSsid in=$Seen do={
:if ($SeenSsid = $Ssid) do={
:log debug ("Already sent a mail for SSID " . $Ssid . ", skipping.");
:set Skip 1;
}
}
:if ($Skip = 0) do={
:set Seen ($Seen, $Ssid);
:local Url ("https://www.eworm.de/cgi-bin/cqrlogo-wifi.cgi" . \
"?scale=8&level=1&ssid=" . [ $UrlEncode $Ssid ] . "&pass=" . [ $UrlEncode $NewPsk ]);
:local Attach "qrcode-daily.png";
:do {
/ tool fetch mode=https check-certificate=yes-without-crl \
$Url dst-path=$Attach;
} on-error={
:set Attach "";
}
$SendNotification ("daily PSK " . $Ssid) \
("This is the daily PSK on " . $Identity . ":\n\n" . \
"SSID: " . $Ssid . "\n" . \
"PSK: " . $NewPsk . "\n" . \
"Date: " . $Date . "\n\n" . \
$Url) $Attach;
}
} else={
:log debug ("Missing active interface " . $IntName . " for access list entry.");
}
}
}
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