Yegor's blog

Small blog about system administration.

Fix DKIM issue in ISPConfig3

Download the patch, unzip and install
cd /tmp
tar xfvz dkim-latest_ispconfig3.tar.gz
cd dkim_ispconfig3
alter the mysql-database
Login to mysql as the root-user:
mysql -u root -p
or use in phpMyAdmin the database an run the follwing sql-code.
Select the database of ISPConfig (see $conf['db_database'] in/usr/local/ispconfig/interface/lib/ and expand:
use dbispconfig;
ALTER TABLE `mail_domain` ADD `dkim_public` MEDIUMTEXT NOT NULL AFTER `domain`; ALTER TABLE `mail_domain` ADD `dkim_private` MEDIUMTEXT NOT NULL AFTER `domain`; ALTER TABLE `mail_domain` ADD `dkim` ENUM( 'n', 'y' ) NOT NULL AFTER `domain`;
Adjust the rights
chown -R ispconfig.ispconfig *
copy the new files,
cp -Rp interface /usr/local/ispconfig
cp -Rp server /usr/local/ispconfig
and activate the server-plugin
ln -s /usr/local/ispconfig/server/plugins-available/ /usr/local/ispconfig/server/plugins-enabled/
customize amavis
If DKIM is not yet activated, a few parameters must be entered in amavisd. The corresponding config file is /etc/amavisd.conf (openSusSE) or/etc/amavis/conf.d/50-user (Debian).
Insert the following lines at the end:
$enable_dkim_verification = 1;
$enable_dkim_signing = 1; # load DKIM signing code,
@dkim_signature_options_bysender_maps = (
{ '.' => { ttl => 21*24*3600, c => 'relaxed/simple' } } );
adjust ISPConfig
Set the path for dkim-keys in Server Config / Mail .

Keys can now be created using the interface for mail domains and registered in DNS.

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Linux: How to change permissions for directories / files only

To recursively give directories read&execute privileges:

find /path/to/base/dir -type d -exec chmod 755 {} +

To recursively give files read privileges:

find /path/to/base/dir -type f -exec chmod 644 {} +

Or, if there are many objects to process:

chmod 755 $(find /path/to/base/dir -type d) chmod 644 $(find /path/to/base/dir -type f) 

Or, to reduce chmod spawning:

find /path/to/base/dir -type d -print0 | xargs -0 chmod 755
find /path/to/base/dir -type f -print0 | xargs -0 chmod 644

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