#!rsc
# RouterOS script: check-certificates
# Copyright (c) 2013-2020 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# check for certificate validity
# https://git.eworm.de/cgit/routeros-scripts/about/doc/check-certificates.md

:global CertRenewPass;
:global CertRenewUrl;
:global Identity;

:global CertificateAvailable
:global CertificateNameByCN;
:global IfThenElse;
:global LogPrintExit;
:global ParseKeyValueStore;
:global SendNotification;
:global TimeIsSync;
:global UrlEncode;
:global WaitForFile;

:local FormatExpire do={
  :global CharacterReplace;
  :return [ $CharacterReplace [ $CharacterReplace [ :tostr $1 ] "w" "w " ] "d" "d " ];
}

:if ($TimeIsSync = false) do={
  $LogPrintExit warning ("Time is not yet synchronized.") true;
}

:foreach Cert in=[ / certificate find where !revoked !ca !scep-url expires-after<3w ] do={
  :local CertVal [ / certificate get $Cert ];

  :do {
    :if ([ :len $CertRenewUrl ] = 0) do={
      $LogPrintExit warning ("No CertRenewUrl given.") true;
    }

    :foreach Type in={ ".pem"; ".p12" } do={
      :local CertFileName ([ $UrlEncode ($CertVal->"common-name") ] . $Type);
      :do {
        / tool fetch check-certificate=yes-without-crl \
            ($CertRenewUrl . $CertFileName) dst-path=$CertFileName;
        $WaitForFile $CertFileName;
        :foreach PassPhrase in=$CertRenewPass do={
          / certificate import file-name=$CertFileName passphrase=$PassPhrase;
        }
        / file remove [ find where name=$CertFileName ];

        :foreach CertInChain in=[ / certificate find where name~("^" . $CertFileName . "_[0-9]+\$") common-name!=($CertVal->"common-name") ] do={
          $CertificateNameByCN [ / certificate get $CertInChain common-name ];
        }
      } on-error={
        $LogPrintExit debug ("Could not download certificate file " . $CertFileName) false;
      }
    }

    :local CertNew [ / certificate find where common-name=($CertVal->"common-name") fingerprint!=[ :tostr ($CertVal->"fingerprint") ] expires-after>3w ];
    :local CertNewVal [ / certificate get $CertNew ];

    :if ([ $CertificateAvailable ([ $ParseKeyValueStore ($CertNewVal->"issuer") ]->"CN") ] = false) do={
      $LogPrintExit warning ("The certificate chain is not available!") false;
    }

    :if ($Cert != $CertNew) do={
      $LogPrintExit debug ("Certificate '" . $CertVal->"name" . "' was not updated, but replaced.") false;

      / ip service set certificate=($CertNewVal->"name") [ find where certificate=($CertVal->"name") ];

      :do {
        / ip ipsec identity set certificate=($CertNewVal->"name") [ / ip ipsec identity find where certificate=($CertVal->"name") ];
        / ip ipsec identity set remote-certificate=($CertNewVal->"name") [ / ip ipsec identity find where remote-certificate=($CertVal->"name") ];
      } on-error={
        $LogPrintExit debug ("Setting IPSEC certificates failed. Package 'security' not installed?") false;
      }

      :do {
        / ip hotspot profile set ssl-certificate=($CertNewVal->"name") [ / ip hotspot profile find where ssl-certificate=($CertVal->"name") ];
      } on-error={
        $LogPrintExit debug ("Setting hotspot certificates failed. Package 'hotspot' not installed?") false;
      }

      / certificate remove $Cert;
      / certificate set $CertNew name=($CertVal->"name");
    }

    $SendNotification ("Certificate renewed") \
      ("A certificate on " . $Identity . " has been renewed.\n\n" . \
        "Name:        " . ($CertVal->"name") . "\n" . \
        "CommonName:  " . ($CertNewVal->"common-name") . "\n" . \
        "Fingerprint: " . ($CertNewVal->"fingerprint") . "\n" . \
        "Issuer:      " . ([ $ParseKeyValueStore ($CertNewVal->"issuer") ]->"CN") . "\n" . \
        "Validity:    " . ($CertNewVal->"invalid-before") . " to " . ($CertNewVal->"invalid-after") . "\n" . \
        "Expires in:  " . [ $FormatExpire ($CertNewVal->"expires-after") ]) "" "true";
    $LogPrintExit info ("The certificate " . ($CertVal->"name") . " has been renewed.") false;
  } on-error={
    $LogPrintExit debug ("Could not renew certificate " . ($CertVal->"name") . ".") false;
  }
}

:foreach Cert in=[ / certificate find where !revoked !scep-url expires-after<2w fingerprint~"." ] do={
  :local CertVal [ / certificate get $Cert ];

  :if ([ / certificate scep-server print count-only where ca-cert=($CertVal->"ca") ] > 0) do={
    $LogPrintExit debug ("Certificate \"" . ($CertVal->"name") . "\" is handled by SCEP, skipping.") false;
  } else={
    :local State [ $IfThenElse (($CertVal->"expired") = true) "expired" "is about to expire" ];

    $SendNotification ("Certificate warning!") \
      ("A certificate on " . $Identity . " " . $State . ".\n\n" . \
        "Name:        " . ($CertVal->"name") . "\n" . \
        "CommonName:  " . ($CertVal->"common-name") . "\n" . \
        "Fingerprint: " . ($CertVal->"fingerprint") . "\n" . \
        "Issuer:      " . ($CertVal->"ca") . ([ $ParseKeyValueStore ($CertVal->"issuer") ]->"CN") . "\n" . \
        "Validity:    " . ($CertVal->"invalid-before") . " to " . ($CertVal->"invalid-after") . "\n" . \
        "Expires in:  " . [ $IfThenElse (($CertVal->"expired") = true) "expired" [ $FormatExpire ($CertVal->"expires-after") ] ]);
    $LogPrintExit warning ("The certificate " . ($CertVal->"name") . " " . $State . \
        ", it is invalid after " . ($CertVal->"invalid-after") . ".") false;
  }
}