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#!rsc
# RouterOS script: daily-psk
# Copyright (c) 2013-2019 Christian Hesse <mail@eworm.de>
#
# update daily PSK (pre shared key)
:global Identity;
:global DailyPskMatchComment;
: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 MonthTbl { 0; 3; 3; 6; 1; 4; 6; 2; 5; 0; 3; 5 };
:local MonthStr [ :pick $Date 0 3 ];
:local Month;
:local Day [ :pick $Date 4 6 ];
:local Century [ :pick $Date 7 9 ];
:local Year [ :pick $Date 9 11 ];
# get numeric value for month
:for MIndex from=0 to=[ :len $Months ] do={
:if ([ :pick $Months $MIndex ] = $MonthStr) do={
:set Month $MIndex;
}
}
# calculate day of week
:local Sum 0;
:set Sum ($Sum + (2 * (3 - ($Century - (($Century / 4) * 4)))));
:set Sum ($Sum + ($Year / 4));
:set Sum ($Sum + $Year + $Day);
:set Sum ($Sum + $Month);
:set Sum ($Sum - (($Sum / 7) * 7));
:local Return ([ :pick [ :pick $DailyPskSecrets 0 ] ($Day - 1) ] . \
[ :pick [ :pick $DailyPskSecrets 1 ] $Month ] . \
[ :pick [ :pick $DailyPskSecrets 2 ] $Sum ]);
:return $Return;
}
: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=" . $Ssid . "&pass=" . $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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