Grommunio Mail Server: Difference between revisions

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{{Draft|This is a work in progress}}
This tutorial covers the steps to set up a mail server on '''Alpine Linux''' using '''grommunio''', an open-source groupware solution that supports email, calendar, and task management. Grommunio stands out with its unique '''MAPI''' support, enabling seamless integration with Microsoft Outlook and other MAPI clients, making it an ideal choice for open-source alternatives to proprietary systems. The setup includes essential components like '''MariaDB''', '''Nginx''', '''PHP''', and '''Postfix''' to create a fully functional mail server. Follow along to build a secure, scalable communication platform using grommunio's powerful features.
 
 
= HOWTO: Install AlpineLinux Mail Server with Grommunio =
 
This tutorial outlines the steps for setting up a mail server on Alpine Linux using '''Grommunio''', a modern, open-source groupware solution that supports email and calendar services. The installation includes MariaDB, Nginx, PHP, Postfix, and other components necessary for a fully functioning mail server.


== Prerequisites ==
== Prerequisites ==
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Before proceeding with the installation, ensure you have a fresh Alpine Linux system setup. You'll need root privileges to execute these commands.
Before proceeding with the installation, ensure you have a fresh Alpine Linux system setup. You'll need root privileges to execute these commands.


== Steps: ==
== Procedure ==


   
   
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== 1. Install and Configure MariaDB ==
== 1. Install and Configure MariaDB ==


=== Step 1: Install MariaDB ===
=== Install MariaDB ===
To start, install MariaDB and necessary client utilities:
To start, install MariaDB and necessary utilities
 
apk add mariadb mariadb-client mariadb-server-utils
 
 
Define the variables used later in the setup setup and configuration.
 
The default datapath is `/var/lib/mysql` and contains the entire database. If you prefer another location define it here and create a symlink. In any case, the grommunio database will be rather small as it only contains the configuration.
 
DB_DATA_PATH="/srv/mysql"
DB_ROOT_PASS="Passw0rd1"
DB_USER="admin"
DB_PASS="Passw0rd2"
 
 
Setup the default system tables:


  apk add mariadb mariadb-client mariadb-server-utils
sudo mysql_install_db --user=mysql --datadir=${DB_DATA_PATH}


=== Step 2: Set up MariaDB Database Variables ===
Define the variables used in the setup and create a symlink to the MariaDB data directory.


  DB_DATA_PATH="/srv/mysql"
Set a symlink to the standard mysql data directory for compatibility reason:
  DB_ROOT_PASS="Passw0rd1"
  DB_USER="admin"
  DB_PASS="Passw0rd2"


Setup system tables and configure the symlink for MariaDB:
ln -s /srv/mysql /var/lib/mysql


  sudo mysql_install_db --user=mysql --datadir=${DB_DATA_PATH}
  ln -s /srv/mysql /var/lib/mysql
  rc-service mariadb restart


Restart service:


=== Step 3: Secure MariaDB ===
rc-service mariadb restart
Run the built-in security script to set a root password and configure MariaDB security settings.


  sudo mysql_secure_installation


=== Step 4: Create MariaDB User for Grommunio ===
Run the built-in security script:
 
Set the new root password to the one defined above and answer everything with 'y'
 
sudo mysql_secure_installation
 
 
=== Create MariaDB User ===
Create a new user for Grommunio and assign privileges:
Create a new user for Grommunio and assign privileges:


  echo "GRANT ALL ON *.* TO ${DB_USER}@'127.0.0.1' IDENTIFIED BY '${DB_PASS}' WITH GRANT OPTION;" > /tmp/sql
echo "GRANT ALL ON *.* TO ${DB_USER}@'127.0.0.1' IDENTIFIED BY '${DB_PASS}' WITH GRANT OPTION;" > /tmp/sql
  echo "GRANT ALL ON *.* TO ${DB_USER}@'localhost' IDENTIFIED BY '${DB_PASS}' WITH GRANT OPTION;" >> /tmp/sql
echo "GRANT ALL ON *.* TO ${DB_USER}@'localhost' IDENTIFIED BY '${DB_PASS}' WITH GRANT OPTION;" >> /tmp/sql
  echo "GRANT ALL ON *.* TO ${DB_USER}@'::1' IDENTIFIED BY '${DB_PASS}' WITH GRANT OPTION;" >> /tmp/sql
echo "GRANT ALL ON *.* TO ${DB_USER}@'::1' IDENTIFIED BY '${DB_PASS}' WITH GRANT OPTION;" >> /tmp/sql
  echo "DELETE FROM mysql.user WHERE User='';" >> /tmp/sql
echo "DELETE FROM mysql.user WHERE User='';" >> /tmp/sql
  echo "FLUSH PRIVILEGES;" >> /tmp/sql
echo "FLUSH PRIVILEGES;" >> /tmp/sql
  cat /tmp/sql | mysql -u root --password="${DB_ROOT_PASS}"
cat /tmp/sql | mysql -u root --password="${DB_ROOT_PASS}"




=== Step 5: Configure MariaDB for Grommunio ===
=== Configure MariaDB ===
Edit the MariaDB configuration for better performance:
Edit the MariaDB configuration for better performance:


  vi /etc/my.cnf.d/mariadb-server.cnf
vi /etc/my.cnf.d/mariadb-server.cnf
 


Add the following configuration:
Add the following configuration:


  [mysqld]
[mysqld]
  innodb_log_buffer_size=16M
#skip-networking
  innodb_log_file_size=32M
  innodb_read_io_threads=4
## Configuration for grommunio (most values are default)
  innodb_write_io_threads=4
innodb_log_buffer_size=16M
  join_buffer_size=512K
innodb_log_file_size=32M
  query_cache_size=0
innodb_read_io_threads=4
  query_cache_type=0
innodb_write_io_threads=4
  query_cache_limit=2M
  performance_schema=ON
join_buffer_size=512K
  bind-address = 127.0.0.1
query_cache_size=0
  skip-name-resolve=ON
query_cache_type=0
query_cache_limit=2M
# Activate performance schema
performance_schema=ON
# Bind to localhost only
bind-address = 127.0.0.1
# Disable DNS lookups as we only use localhost connections
skip-name-resolve=ON
 


Create a default charset configuration for MariaDB:
Create a default charset configuration for MariaDB:


  cat > /etc/my.cnf.d/mariadb-server-default-charset.cnf << EOF
cat > /etc/my.cnf.d/mariadb-server-default-charset.cnf << EOF
  [client]
[client]
  default-character-set = utf8mb4
default-character-set = utf8mb4
 
  [mysqld]
[mysqld]
  collation_server = utf8mb4_general_ci
collation_server = utf8mb4_general_ci
  character_set_server = utf8mb4
character_set_server = utf8mb4
 
  [mysql]
[mysql]
  default-character-set = utf8mb4
default-character-set = utf8mb4
  EOF
EOF
 


Restart MariaDB and enable it to start on boot:
Restart MariaDB and enable it to start on boot:


  rc-update add mariadb default
rc-update add mariadb default
  service mariadb restart
rc-service mariadb restart


=== Step 6: Verify MariaDB Setup
Check if the MariaDB listener is running and bound to the correct address:


  ss -tulpn
=== Verify MariaDB Setup ===
Check if the MariaDB listener is running and bound to the correct interface (127.0.0.1):


ss -tulpn


=== Step 7: Create Grommunio Database ===
=== Create Grommunio Database ===
Define the database parameters and create the Grommunio database:
Define the database parameters and create the Grommunio database:


  MYSQL_HOST="localhost"
MYSQL_HOST="localhost"
  MYSQL_USER="grommunio"
MYSQL_USER="grommunio"
  MYSQL_PASS="Passw0rd3"
MYSQL_PASS="Passw0rd3"
  MYSQL_DB="grommunio"
MYSQL_DB="grommunio"
 
echo "create database $MYSQL_DB character set 'utf8mb4';" > /tmp/sql
echo "grant select, insert, update, delete, create, drop, index, alter, create temporary tables, lock tables on $MYSQL_DB.* TO $MYSQL_USER@$MYSQL_HOST identified by '$MYSQL_PASS';" >> /tmp/sql
echo "flush privileges;" >> /tmp/sql
cat /tmp/sql | mysql -u admin --password="${DB_PASS}"


  echo "create database $MYSQL_DB character set 'utf8mb4';" > /tmp/sql
  echo "grant select, insert, update, delete, create, drop, index, alter, create temporary tables, lock tables on
  $MYSQL_DB.* TO $MYSQL_USER@$MYSQL_HOST identified by '$MYSQL_PASS';" >> /tmp/sql
  echo "flush privileges;" >> /tmp/sql
  cat /tmp/sql | mysql -u admin --password="${DB_PASS}"


Test the database connection:
Test the database connection:


  mysql -hlocalhost -u grommunio -p${MYSQL_PASS} grommunio
mysql -hlocalhost -u grommunio -p${MYSQL_PASS} grommunio
 




== 2. MariaDB Performance Tuning (Optional) ==
== 2. MariaDB Performance Tuning (Optional) ==


Install and configure MySQLTuner to help with database performance:
To assist us in checking and tuning the configuration as per our specific needs, we can install mysqltuner, a script that will provide suggestions to improve the performance of our database server and increase its stability
 
=== Download MySQLTuner ===
 
wget -v https://raw.githubusercontent.com/major/MySQLTuner-perl/master/mysqltuner.pl -O /tmp/mysqltuner.pl
 
 
Move it to the correct directory and set permissions:
 
mv /tmp/mysqltuner.pl /usr/local/bin/mysqltuner.pl
chmod 755 /usr/local/bin/mysqltuner.pl
 
 
=== Install perl ===
 
NOTE: The perl-doc package is installed because it's the only one containing the perldiag.pod required by mysqltuner.pl
 
apk add perl perl-doc
 
 
=== Execute the script ===
 
You will be prompted to enter the credentials of your administrative MariaDB account:
 
/usr/local/bin/mysqltuner.pl --user admin --pass ${DB_PASS}


  wget -v --no-check-certificate https://raw.githubusercontent.com/major/MySQLTuner-perl/master/mysqltuner.pl -O /tmp/mysqltuner.pl
  mv /tmp/mysqltuner.pl /usr/local/bin/mysqltuner.pl
  chmod 755 /usr/local/bin/mysqltuner.pl
  apk add perl perl-doc
  /usr/local/bin/mysqltuner.pl --user admin --pass ${DB_PASS}




== 3. Install and Configure Nginx ==
== 3. Install and Configure Nginx ==


=== Step 1: Install Nginx ===
=== Install Nginx ===
Install the necessary Nginx modules:
Install the necessary Nginx modules:


  apk add nginx nginx-mod-http-headers-more nginx-mod-http-vts nginx-mod-http-brotli
apk add nginx nginx-mod-http-headers-more nginx-mod-http-vts nginx-mod-http-brotli




=== Step 2: Configure Nginx ===
=== Configure Nginx ===
Backup the original Nginx configuration and edit it for security headers and TLS settings:
Backup the original Nginx configuration and edit it for security headers and TLS settings:


  cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.orig
cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.orig
  vi /etc/nginx/nginx.conf
vi /etc/nginx/nginx.conf




Add the following configuration:
Add the following configuration:


  error_log syslog:server=unix:/dev/log,facility=local2,nohostname warn;
#error_log /var/log/nginx/error.log warn;
  more_set_headers "Strict-Transport-Security : max-age=2592000; includeSubDomains;";
error_log syslog:server=unix:/dev/log,facility=local2,nohostname warn;
  more_set_headers "X-Frame-Options : SAMEORIGIN";
  more_set_headers "Content-Security-Policy : default-src https: data: 'unsafe-inline' 'unsafe-eval' always";
### Common headers for security
  more_set_headers "X-Xss-Protection : 1; mode=block";
# TODO: Set temporary to a lower value until we are sure it's working
  more_set_headers "X-Content-Type-Options : nosniff";
#more_set_headers "Strict-Transport-Security : max-age=15768000; includeSubDomains; preload";
  more_set_headers "Referrer-Policy : strict-origin-when-cross-origin";
more_set_headers "Strict-Transport-Security : max-age=2592000; includeSubDomains;";
  more_set_headers "Server : Follow the white rabbit.";
more_set_headers "X-Frame-Options : SAMEORIGIN";
more_set_headers "Content-Security-Policy : default-src https: data: 'unsafe-inline' 'unsafe-eval' always";
more_set_headers "X-Xss-Protection : 1; mode=block";
more_set_headers "X-Content-Type-Options : nosniff";
more_set_headers "Referrer-Policy : strict-origin-when-cross-origin";
more_set_headers "Server : Follow the white rabbit.";
### TLS settings
ssl_protocols TLSv1.2 TLSv1.3;
ssl_session_cache shared:SSL:1m;
ssl_session_timeout 5m;
log_format main_ssl '$remote_addr - $remote_user [$time_local] "$request" '
        '$status $body_bytes_sent "$http_referer" '
        '"$http_user_agent" "$http_x_forwarded_for" '
        'client_ciphers="$ssl_ciphers" client_curves="$ssl_curves"';
#access_log /var/log/nginx/access.log main_ssl; # Disabled for performance
#access_log syslog:server=unix:/dev/log,facility=local2,nohostname main; # Disabled for performance
access_log off;


  ssl_protocols TLSv1.2 TLSv1.3;
  ssl_session_cache shared:SSL:1m;
  ssl_session_timeout 5m;


  log_format main_ssl '$remote_addr - $remote_user [$time_local] "$request" '
Disable the default page by renaming it:
  '$status $body_bytes_sent "$http_referer" '
 
  '"$http_user_agent" "$http_x_forwarded_for" '
mv /etc/nginx/http.d/default.conf /etc/nginx/http.d/default.orig
  'client_ciphers="$ssl_ciphers" client_curves="$ssl_curves"';
 
  access_log off;




Restart Nginx and enable it to start on boot:
Restart Nginx and enable it to start on boot:


  rc-update add nginx
rc-update add nginx
  service nginx restart
rc-service nginx restart
 




== 4. Install and Configure PHP ==
== 4. Install and Configure PHP ==


=== Step 1: Install PHP ===
=== Install PHP ===
Install the required PHP packages for Grommunio:
Install the basic php packages. The modules are installed as grommunio dependencies:


  apk add php83 php83-fpm
apk add php83 php83-fpm


Disable default fpm conf:


=== Step 2: Harden PHP Configuration ===
mv /etc/php83/php-fpm.d/www.conf /etc/php83/php-fpm.d/www.conf.default
Disable insecure PHP settings and adjust PHP limits:


  sed 's/^;\?\(allow_url_fopen\).*/\1 = Off/' -i /etc/php83/php.ini
  sed 's/^;\?\(expose_php\).*/\1 = Off/' -i /etc/php83/php.ini
  sed 's/^;\?\(display_errors\).*/\1 = Off/' -i /etc/php83/php.ini
  sed 's/^;\?\(log_errors\).*/\1 = On/' -i /etc/php83/php.ini


=== Harden PHP Configuration ===


=== Step 3: Configure Session Security ===
Configure PHP session security:


   sed 's/^;\?\(session.use_strict_mode\).*/\1 = 1/' -i /etc/php83/php.ini
Backup config file /etc/php83/php.ini
  sed 's/^;\?\(session.cookie_secure\).*/\1 = 1/' -i /etc/php83/php.ini
 
  sed 's/^;\?\(session.cookie_httponly\).*/\1 = 1/' -i /etc/php83/php.ini
cp /etc/php83/php.ini /etc/php83/php-fpm.d/php.ini.orig
 
 
Disable remote PHP code execution:
 
sed 's/^;\?\(allow_url_fopen\).*/\1 = Off/' -i /etc/php83/php.ini
sed 's/^;\?\(allow_url_include\).*/\1 = Off/' -i /etc/php83/php.ini
 
 
Disable information leakage:
    
sed 's/^;\?\(expose_php\).*/\1 = Off/' -i /etc/php83/php.ini
 
 
Configure Error handling:
 
sed 's/^;\?\(display_errors\).*/\1 = Off/' -i /etc/php83/php.ini
sed 's/^;\?\(display_startup_errors\).*/\1 = Off/' -i /etc/php83/php.ini
sed 's/^;\?\(log_errors\).*/\1 = On/' -i /etc/php83/php.ini
sed 's/^;\?\(error_log = syslog\).*/\1/' -i /etc/php83/php.ini
 
 
PHP Resource Control (Optional):
 
#sed 's/^\(max_execution_time\).*/\1 = 25/' -i /etc/php83/php.ini
#sed 's/^\(max_input_time\).*/\1 = 25/' -i /etc/php83/php.ini
#sed 's/^\(memory_limit\).*/\1 = 30M/' -i /etc/php83/php.ini
#sed 's/^\(post_max_size\).*/\1 = 1M/' -i /etc/php83/php.ini
#sed 's/^;\?\(max_input_vars\).*/\1 = 1000/' -i /etc/php83/php.ini
 
 
Disable vulnerable functions:
 
sed 's/^\(disable_functions\).*/\1 = apache_note, apache_setenv, chgrp, curl_multi_exec, define_sys, define_syslog_variables, debugger_off, debugger_on, diskfreespace, _getppid, escapeshellarg, escapeshellcmd, exec, getmyuid, ini_restore, leak, listen, parse_ini_file, passthru, pcntl_alarm, pcntl_async_signals, pcntl_exec, pcntl_fork, pcntl_get_last_error, pcntl_getpriority, pcntl_setpriority, pcntl_signal, pcntl_signal_dispatch, pcntl_signal_get_handler, pcntl_sigprocmask, pcntl_sigtimedwait, pcntl_sigwaitinfo, pcntl_strerror, pcntl_unshare, pcntl_wait, pcntl_waitpid, pcntl_wexitstatus, pcntl_wifcontinued, pcntl_wifexited, pcntl_wifsignaled, pcntl_wifstopped, pcntl_wstopsig, pcntl_wtermsig, posix, posix_ctermid, posix_getcwd, posix_getegid, posix_geteuid, posix_getgid, posix_getgrgid, posix_getgrnam, posix_getgroups, posix_getlogin, posix_getpgid, posix_getpgrp, posix_getpid, posix_getpwnam, posix_getpwuid, posix_getrlimit, posix_getsid, posix_isatty, posix_kill, posix_mkfifo, posix_setegid, posix_seteuid, posix_setgid, posix_setpgid, posix_setsid, posix_setuid, posix_times, posix_ttyname, posix_uname, popen, proc_close, proc_get_status, proc_nice, proc_open, proc_terminate, shell_exec, show_source, system, url_exec/' -i /etc/php83/php.ini
 
 
Harden Session Security:
 
sed 's/^;\?\(session.use_strict_mode\).*/\1 = 1/' -i /etc/php83/php.ini  
sed 's/^;\?\(session.use_cookies\).*/\1 = 1/' -i /etc/php83/php.ini
sed 's/^;\?\(session.cookie_secure\).*/\1 = 1/' -i /etc/php83/php.ini  
sed 's/^;\?\(session.use_only_cookies\).*/\1 = 1/' -i /etc/php83/php.ini
sed 's/^;\?\(session.cookie_httponly\).*/\1 = 1/' -i /etc/php83/php.ini
 




== 5. Install and Configure Postfix ==
== 5. Install and Configure Postfix ==


=== Step 1: Install Postfix ===
=== Install Postfix ===
Install Postfix and related modules:
Install the required packages:


  apk add postfix postfix-mysql postfix-pcre
apk add postfix postfix-mysql postfix-pcre




=== Step 2: Configure Postfix ===
=== Configure Postfix ===
Backup and configure the Postfix settings. Adapt the values as necessary, such as `myhostname`, `mynetworks`, and `smtp_tls_chain_files`:


  mv /etc/postfix/main.cf /etc/postfix/main.cf.orig
First backup the original files:
  mv /etc/postfix/master.cf /etc/postfix/master.cf.orig
mv /etc/postfix/main.cf /etc/postfix/main.cf.orig
mv /etc/postfix/master.cf /etc/postfix/master.cf.orig
mv /etc/postfix/header_checks /etc/postfix/header_checks.orig
 
 
Download the prepared configuration files:
 
wget https://alpinelinuxsupport.com/downloads/postfix-configuration-files.zip
 
 
Copy the prepared configuration files to `/etc/postfix/` and adapt the configuration to your environment. Ensure you change at least the following values:
 
'''main.cf''': myhostname, mynetworks, smtp_tls_chain_files, smtpd_tls_chain_files, local_recipient_maps, mydestination,
        virtual_*, relayhost, mua_sender_restrictions, smtpd_recipient_restrictions
'''master.cf''': smtpd_tls_chain_files=/etc/ssl/private/internal-server-key-and-cert.pem
 
 
Create the required postmap files:
newaliases
postmap /etc/postfix/transport




Run Postfix setup:
Run Postfix setup:


  newaliases
newaliases
  postmap /etc/postfix/transport
postmap /etc/postfix/transport




Enable Postfix service:
Enable the postfix service and restart:


  rc-update add postfix
rc-update add postfix
  service postfix restart
rc-service postfix restart


=== Verify Postfix Logs ===
Check the Postfix logs for any errors:


=== Step 3: Verify Postfix Logs ===
tail -f /var/log/maillog
Check the Postfix logs for any errors:


tail -f /var/log/maillog




== 6. Install and Configure Grommunio ==
== 6. Install and Configure Grommunio ==


Install and configure Grommunio to provide email and calendar functionality. Follow the detailed installation steps outlined in the official Grommunio documentation.
=== Enable IPv6 ===
First of all, turn on ipv6 which is mandatory for grommunio daemons
 
Edit `/etc/hosts` to include IPv6 localhost:
vi /etc/hosts
-----
::1 localhost ipv6-localhost ipv6-loopback




== 7. Configure Valkey (Redis Replacement) ==
Ensure IPv6 is enabled in `/etc/sysctl.conf`:
Configure Valkey for optimal caching and session handling, replacing Redis if required.


sed -i 's/^net\.ipv6\.conf\..*\.disable_ipv6\s=\s1/#&/' /etc/sysctl.conf
sysctl -p
ping ::1  # Test if IPv6 is working


== 8. Install and Configure Rspamd ==


Rspamd provides spam filtering for your mail server. Follow the official documentation to install and configure Rspamd to work with Postfix and Nginx.
=== Specify Database Parameters ===
Specify DB parameters if necessary (already specified above in step 1)
 
MYSQL_HOST="localhost"
MYSQL_USER="grommunio"
MYSQL_PASS="Passw0rd3"
MYSQL_DB="grommunio"
 
 
=== Specify Domain Parameters ===
The '''FQDN''' is for example used by Outlook clients to connect. This name will have to be present in the used certificate.
 
The default '''Mail Domain''' is for example used for Non-Delivery Reports and for generation of some simple TLS certificates. Specify ONLY ONE domain here.
 
Adjust the following for your specific setup:
 
FQDN="mail.example.local"
MAILDOMAIN="example.com"
RELAYHOST="123.123.123.1"
ADMIN_PASS="Passw0rd4"
 
 
=== Install Packages ===
 
Install necessary dependencies (util-linux-login is required to get pam.d working):
 
apk add valkey valkey-cli cyrus-sasl cyrus-sasl-login util-linux-login
 
 
Install grommunio packages:
 
apk add grommunio-gromox grommunio-web grommunio-admin-api grommunio-admin-web grommunio-index grommunio-error-pages
 
 
Optionally, install deprecated ActiveSync if needed:
 
apk add grommunio-dav grommunio-sync
 
 
=== Relocate Mail Storage ===
The directory `/var/lib/gromox` will be the largest directory containing all the mails and attachments. We therefore relocate it to another disk and create a symlink:
 
mv /var/lib/gromox /srv/gromox
ln -s /srv/gromox /var/lib/gromox
 
 
=== Enable Required Services ===
Enable all required services:
 
rc-update add grommunio-admin-api
rc-update add gromox-delivery
rc-update add gromox-delivery-queue
rc-update add gromox-event
rc-update add gromox-http
rc-update add gromox-imap
rc-update add gromox-midb
rc-update add gromox-pop3
rc-update add gromox-timer
rc-update add gromox-zcore
rc-update add valkey@grommunio
rc-update add php-fpm83
rc-update add saslauthd
 


=== Configure Grommunio ===
Modify the configuration files with the custom parameters specified above.


== 9. Finalize and Verify Installation ==
Configure gromox *.cfg:


=== Step 1: Test Server Components ===
sed -i "s/mail.example.local/${FQDN}/g" /etc/gromox/*.cfg
Ensure that all services (Postfix, MariaDB, Nginx, PHP, Grommunio) are running correctly:
sed -i "s/example.com/${MAILDOMAIN}/g" /etc/gromox/*.cfg


  ss -tulpn


Configure gromox adaptor:
sed -i "s/<password>/${MYSQL_PASS}/g" /etc/gromox/mysql_adaptor.cfg
cat /etc/gromox/mysql_adaptor.cfg


=== Step 2: Verify Mail Functionality ===
Test sending and receiving emails using a mail client and verifying server logs for any errors.


Configure autodiscovery:
sed -i "s/mail.example.local/${FQDN}/g" /etc/gromox/autodiscover.ini
sed -i "s/<password>/${MYSQL_PASS}/g" /etc/gromox/autodiscover.ini
cat /etc/gromox/autodiscover.ini


== 6. Install and Configure Grommunio ==


=== 1. Enable IPv6 ===
Prepare additional postfix file for sender maps:
Since Grommunio requires IPv6 for its daemons:
cp -p /etc/postfix/grommunio-virtual-mailbox-maps.cf /etc/postfix/grommunio-virtual-mailbox-sender-maps.cf
sed -i '/^query =/d' /etc/postfix/grommunio-virtual-mailbox-sender-maps.cf
echo "query = SELECT username FROM users WHERE username='%s' UNION SELECT aliasname FROM aliases WHERE mainname='%s'" >> /etc/postfix/grommunio-virtual-mailbox-sender-maps.cf


1. Edit `/etc/hosts` to include IPv6 localhost:
  vi /etc/hosts
  -----
  ::1 localhost ipv6-localhost ipv6-loopback
  -----


Configure postfix files:
sed -i "s/<password>/${MYSQL_PASS}/g" /etc/postfix/grommunio*.cf


2. Ensure IPv6 is enabled in `/etc/sysctl.conf`:
  sed -i 's/^net\.ipv6\.conf\..*\.disable_ipv6\s=\s1/#&/' /etc/sysctl.conf
  sysctl -p
  ping ::1  # Test if IPv6 is working


Configure TLS certificates:
sed -i "s/mail.example.local/${FQDN}/g" /etc/grommunio-common/nginx/ssl_certificate.conf
sed -i "s/mail.example.local/${FQDN}/g" /etc/grommunio-admin-common/nginx-ssl.conf


=== 2. Configure Database Parameters ===
Set up your MySQL database connection details:


  MYSQL_HOST="localhost"
Link TLS certificate configuration:
  MYSQL_USER="grommunio"
  MYSQL_PASS="Passw0rd3"
  MYSQL_DB="grommunio"


Since both ssl files are identical it might make more sense to link them


=== 3. Specify Internal FQDN, Mail Domain, and Relayhost ===
ln -s /etc/grommunio-common/nginx/ssl_certificate.conf /etc/grommunio-admin-common/nginx-ssl.conf
Adjust the following for your specific setup:


  FQDN="mail.example.local"
  MAILDOMAIN="example.com"
  RELAYHOST="123.123.123.1"
  ADMIN_PASS="Passw0rd4"


Configure grommunio admin:


=== 4. Install Dependencies and Grommunio Packages ===
sed -i "s/mail.example.local/${FQDN}/g" /etc/grommunio-admin-common/config.json
Install necessary dependencies:
sed -i "s/<password>/${MYSQL_PASS}/g" /etc/grommunio-admin-api/conf.d/database.yaml
cat /etc/grommunio-admin-api/conf.d/database.yaml


  apk add valkey valkey-cli cyrus-sasl cyrus-sasl-login util-linux-login
  apk add grommunio-gromox grommunio-web grommunio-admin-api grommunio-admin-web grommunio-index grommunio-error-pages


Prepare external or self-signed certificate and put them to:
/etc/ssl/certs/${FQDN}.cert.pem
/etc/ssl/private/${FQDN}.key.pem


Optionally, install deprecated ActiveSync if needed:


  # apk add grommunio-dav grommunio-sync
Concatenate key and cert as needed by postfix:
cat /etc/ssl/private/${FQDN}.key.pem \
    /etc/ssl/certs/${FQDN}.cert.pem \
  > /etc/ssl/private/${FQDN}.key_cert.pem
chmod 640 /etc/ssl/private/*.key_cert.pem
chown root:ssl-cert /etc/ssl/private/*.key_cert.pem
ls -al /etc/ssl/private/




=== 5. Move Mail Storage to Another Disk ===
Add gromox to ssl-cert (or another) group allowed to read the private keys:
Move the largest directory `/var/lib/gromox` to another disk and create a symlink:
addgroup gromox ssl-cert


  mv /var/lib/gromox /srv/gromox
  ln -s /srv/gromox /var/lib/gromox


Retrieve the certificate fingerprint:


=== 6. Enable Required Services ===
NOTE: This is only required if you work with a relay server authenticating the client cert.
Enable all necessary Grommunio services:


  rc-update add grommunio-admin-api
Add the output to the relay_clientcerts file on the relay server and hash it with the postmap command.
  rc-update add gromox-delivery
  rc-update add gromox-delivery-queue
  # Add all the other grommunio services


openssl x509 -noout -fingerprint -sha384 -in /etc/ssl/certs/${FQDN}.cert.pem


=== 7. Configure Grommunio Files ===
Modify the configuration files to match your environment:


  sed -i "s/mail.example.local/${FQDN}/g" /etc/gromox/*.cfg
Configure PAM for SMTP:
  sed -i "s/example.com/${MAILDOMAIN}/g" /etc/gromox/*.cfg
  # Continue modifying other configuration files (mysql_adaptor.cfg, autodiscover.ini, etc.)


mv /etc/pam.d/smtp /etc/pam.d/smtp.orig
cat > /etc/pam.d/smtp <<EOF
#%PAM-1.0
# config for grommunio auth services
auth    required pam_gromox.so service=smtp
account required pam_permit.so
EOF


=== 8. Configure Postfix ===
Prepare Postfix for integration with Grommunio:


  cp -p /etc/postfix/grommunio-virtual-mailbox-maps.cf /etc/postfix/grommunio-virtual-mailbox-sender-maps.cf
Configure SASL authentication:
  sed -i '/^query =/d' /etc/postfix/grommunio-virtual-mailbox-sender-maps.cf
  echo "query = SELECT username FROM users WHERE username='%s' UNION SELECT aliasname FROM aliases WHERE mainname='%s'" >> /etc/postfix/grommunio-virtual-mailbox-sender-maps.cf


cat > /etc/conf.d/saslauthd <<EOF
# Configuration for /etc/init.d/saslauthd
SASLAUTHD_OPTS="-a pam -r"
EOF


=== 9. Configure TLS Certificates ===
Link and configure your SSL certificates:


  ln -s /etc/grommunio-common/nginx/ssl_certificate.conf /etc/grommunio-admin-common/nginx-ssl.conf
SASL configuration for SMTP service:
  cat /etc/ssl/private/${FQDN}.key.pem /etc/ssl/certs/${FQDN}.cert.pem > /etc/ssl/private/${FQDN}.key_cert.pem
  chmod 640 /etc/ssl/private/*.key_cert.pem
  addgroup gromox ssl-cert


mkdir /etc/sasl2
cat > /etc/sasl2/smtpd.conf <<EOF
pwcheck_method: saslauthd
mech_list: plain login
EOF
chmod 600 /etc/sasl2/smtpd.conf


=== 10. Configure PAM and SASL ===
Set up authentication services:


  # Configure PAM for SMTP
In case you migrate from another server replace X500-org-name with the original one:
  cat > /etc/pam.d/smtp <<EOF
  #%PAM-1.0
  auth required pam_gromox.so service=smtp
  account required pam_permit.so
  EOF


  # Configure SASL authentication
X500_ORG_NAME_OLD=$(grep 'x500_org_name=' /etc/gromox/zcore.cfg | cut -d= -f2)
  cat > /etc/conf.d/saslauthd <<EOF
X500_ORG_NAME_NEW=<original-key>
  SASLAUTHD_OPTS="-a pam -r"
sed -i "s/$X500_ORG_NAME_OLD/$X500_ORG_NAME_NEW/g" /etc/gromox/*
  EOF




=== 11. Initialize the Database and Set Admin Password ===
=== Initialize Database ===
Initialize the database:
Initialize the database:


  gromox-dbop -C
gromox-dbop -C
 


Set the Grommunio admin password:
Set the Grommunio admin password:


  grommunio-admin passwd --password "${ADMIN_PASS}"
grommunio-admin passwd --password "${ADMIN_PASS}"
 
 
Add grommunio to the adm group to enable admin UI to read `/var/log/maillog`.
 
NOTE: Additional custom patch is needed to make the log monitoring work
 
addgroup grommunio adm




=== 12. Configure Firewall Ports ===
=== Configure Firewall ===
Open the necessary firewall ports:
Open the necessary firewall ports:


  # Required ports: 25, 80, 443, etc.
25/tcp
80/tcp
110/tcp
143/tcp
443/tcp
587/tcp
993/tcp
995/tcp
8080/tcp
8443/tcp
 
 


== 7. Configure Valkey (Redis Replacement) ==
== 7. Configure Valkey ==


=== 1. Enable Syslog: ===
=== Enable Syslog ===
 
The syslog facility is set to 'local0'.
 
NOTE: It is recommended to redirect local0 to the maillog in syslog.conf as all other grommunio processes write to maillog
 
vi /etc/valkey/grommunio.conf
-----
#pidfile /var/run/valkey/default.pid
#logfile /var/log/valkey/default.log
syslog-enabled yes
syslog-ident valkey
syslog-facility local0


  vi /etc/valkey/grommunio.conf
  -----
  syslog-enabled yes
  syslog-ident valkey
  syslog-facility local0
  -----


=== Enable Memory Overcommit ===


=== 2. Enable Memory Overcommit: ===
Add the following sysctl property for valkey


   vi /etc/sysctl.conf
   vi /etc/sysctl.conf
   -----
   -----
  # Enable memory overcommit for valkey 
   vm.overcommit_memory = 1
   vm.overcommit_memory = 1
  -----
  sysctl -p




=== 3. Start Valkey and Test: ===
Update the system configuration
 
sysctl -p
 
 
=== Start Valkey and Test ===
 
rcctl restart valkey@grommunio
valkey-cli ping  # Expected result: 'PONG'
 


  rcctl restart valkey@grommunio
  valkey-cli ping  # Expected result: 'PONG'


== 8. Install and Configure Rspamd ==
== 8. Install and Configure Rspamd ==


=== 1. Install Rspamd: ===
=== Install Rspamd ===


   apk add rspamd rspamd-client
   apk add rspamd rspamd-client




=== 2. Configure Rspamd: ===
=== Configure Rspamd ===
Modify Rspamd configuration files:
Set general options:


  cat > /etc/rspamd/local.d/options.inc <<EOF
cat > /etc/rspamd/local.d/options.inc <<EOF
  dns {
dns {
    enable_dnssec = true;
  enable_dnssec = true;
    timeout = 4s;
  timeout = 4s;
   retransmits = 5;
   retransmits = 5;
  }
}
  EOF
EOF
 
 
Configure redis/valkey connection:
 
cat > /etc/rspamd/local.d/redis.conf <<EOF
read_servers = "127.0.0.1";
write_servers = "127.0.0.1";
EOF
 
 
Configure normal worker:
 
cat > /etc/rspamd/local.d/worker-normal.inc << EOF
# Normal worker is intended to scan messages for spam
# You might disable normal worker to free up system resources as we use the proxy worker in self-scan mode
enabled = false;
# If the mailer is running on the same host use a unix socket
#bind_socket = "127.0.0.1:11333";
#bind_socket = "/var/run/rspamd/worker-normal.sock mode=0660 owner=rspamd";
EOF
 
 
Configure proxy worker:
 
cat > /etc/rspamd/local.d/worker-proxy.inc << EOF
# Proxy worker is used as postfix milter
# If the mailer is running on the same host use a unix socket
milter = yes;
#bind_socket = "127.0.0.1:11332";
bind_socket = "/var/run/rspamd/worker-proxy.sock mode=0660 owner=rspamd";
timeout = 120s;
upstream "local" {
  default = yes; # Self-scan upstreams are always default
  self_scan = yes; # Enable self-scan
}
count = 4; # Spawn more processes in self-scan mode
EOF
 
 
Add postfix to rspamd group to access the socket:
 
addgroup postfix rspamd
 
 
Configure controller worker:
 
cat > /etc/rspamd/local.d/worker-controller.inc << EOF
# Controller worker is used to manage rspamd stats, to learn rspamd and to serve WebUI
# If the mailer is running on the same host use a unix socket
# NOTE: grommunio connects over http
bind_socket = "127.0.0.1:11334";
#bind_socket = "/var/run/rspamd/worker-controller.sock mode=0660 owner=rspamd";
# password for read-only commands
password = "<encrypted_password_string>";
# password for write commands
enable_password = "<encrypted_password_string>"
secure_ip = "127.0.0.1";
EOF
 
 
Create the user password and replace it in worker-controller.inc:
 
Command: rspamadm pw --encrypt -p P4ssword
 
sed -i s/\<encrypted_password_string\>/$(rspamadm pw --encrypt -p "${ADMIN_PASS}")/ /etc/rspamd/local.d/worker-controller.inc
cat /etc/rspamd/local.d/worker-controller.inc
 
 
Redirect rspamd logs to syslog:
 
cat > /etc/rspamd/local.d/logging.inc << EOF
# Redirect rspamd logs to the mail log
type = "syslog";
facility = "mail";
level = "notice";
EOF
 
 
Configure external relay:
 
cat > /etc/rspamd/local.d/external_relay.conf << EOF
enabled = true;
rules {
  FETCHMAIL {
    strategy = "local";
  }
}
EOF
 
 
Configure actions:
 
cat > /etc/rspamd/local.d/actions.conf << EOF
reject = 15; # Reject when reaching this score
add_header = 4; # Add spam header when reaching this score
greylist = 3; # Apply greylisting when reaching this score (will emit 'soft reject action')
#rewrite_subject = 6; # Rewrite subject to indicate spam. Cannot be combined with add_header
#unknown_weight = 1.0; # Enable if need to set score for all symbols implicitly
#subject = "***SPAM*** %s"; # Set rewrite subject to this value (%s is replaced by the original subject)
EOF
 
 
Configure milter_headers:
 
cat > /etc/rspamd/local.d/milter_headers.conf << EOF
# Enables x-spamd-result, x-rspamd-server and x-rspamd-queue-id headers (default false)
extended_spam_headers = true;
# Set false to always add headers for local IPs (default true)
skip_local = false;
# Set false to always add headers for authenticated users (default true)
skip_authenticated = false;
# Set false to keep pre-existing spam flag added by an upstream spam filter (default true)
remove_upstream_spam_flag = true;
EOF


  cat > /etc/rspamd/local.d/redis.conf <<EOF
  read_servers = "127.0.0.1";
  write_servers = "127.0.0.1";
  EOF


  cat > /etc/rspamd/local.d/worker-proxy.inc <<EOF
Configure dkim signing:
  milter = yes;
  bind_socket = "/var/run/rspamd/worker-proxy.sock mode=0660 owner=rspamd";
  timeout = 120s;
  upstream "local" {
    default = yes;
    self_scan = yes;
  }
  count = 4;
  EOF


cat > /etc/rspamd/local.d/dkim_signing.conf << EOF
# Enable DKIM signing
enabled = true;
# If false, messages with empty envelope from are not signed
allow_envfrom_empty = true;
# If true, envelope/header domain mismatch is ignored
allow_hdrfrom_mismatch = true;
# If true, multiple from headers are allowed (but only first is used)
allow_hdrfrom_multiple = false;
# If true, username does not need to contain matching domain
allow_username_mismatch = true;
# Default path to key, can include '$domain' and '$selector' variables
path = "/var/lib/rspamd/dkim/\$domain-\$selector.key";
# Default selector to use
selector = "dkim";
# If false, messages from authenticated users are not selected for signing
sign_authenticated = true;
# If false, messages from local networks are not selected for signing
sign_local = false;
# Map file of IP addresses/subnets to consider for signing
#sign_networks = "/some/file"; # or url
# Symbol to add when message is signed
symbol = "DKIM_SIGNED";
# If false, messages from domains not defined here will not be signed
try_fallback = false;
# Domain to use for DKIM signing: can be "header" (MIME From), "envelope" (SMTP From),
#  "recipient" (SMTP To), "auth" (SMTP username) or directly specified domain name
use_domain = "header";
# Domain to use for DKIM signing when sender is in sign_networks ("header"/"envelope"/"auth")
#use_domain_sign_networks = "header";
# Domain to use for DKIM signing when sender is a local IP ("header"/"envelope"/"auth")
#use_domain_sign_local = "header";
# Whether to normalise domains to eSLD
use_esld = true;
# Whether to get keys from Redis
use_redis = false;
# Hash for DKIM keys in Redis
key_prefix = "DKIM_KEYS";
# map of domains -> names of selectors (since rspamd 1.5.3)
#selector_map = "/etc/rspamd/dkim_selectors.map";
# map of domains -> paths to keys (since rspamd 1.5.3)
#path_map = "/etc/rspamd/dkim_paths.map";
# If `true` get pubkey from DNS record and check if it matches private key
check_pubkey = false;
# Set to `false` if you want to skip signing if public and private keys mismatch
allow_pubkey_mismatch = true;
# Domain specific settings
domain {
  <maildomain> { selector = "<selector>"; }
}
EOF


=== 3. Add Postfix to Rspamd Group: ===


  addgroup postfix rspamd
Specify parameters (MAILDOMAIN already defined above):


MAILDOMAIN="example.com"
SELECTOR="202406"


=== 4. Configure DKIM Signing: ===


  cat > /etc/rspamd/local.d/dkim_signing.conf <<EOF
Replace maildomain and selector in configuration:
  enabled = true;
  path = "/var/lib/rspamd/dkim/\$domain-\$selector.key";
  selector = "dkim";
  sign_authenticated = true;
  sign_local = false;
  domain {
    example.com { selector = "202406"; }
  }
  EOF


sed -i "s/<maildomain>/${MAILDOMAIN}/g" /etc/rspamd/local.d/dkim_signing.conf
sed -i "s/<selector>/${SELECTOR}/g" /etc/rspamd/local.d/dkim_signing.conf


=== 5. Generate DKIM Key Pair: ===


  mkdir -p /var/lib/rspamd/dkim
Create DKIM Key Pair:
  rspamadm dkim_keygen -s 202406 -t ED25519 -d example.com -k /var/lib/rspamd/dkim/example.com-202406.key >
  /var/lib/rspamd/dkim/example.com-202406.pub


NOTE: The 'pub' file contains the public key and the configuration to create the corresponding dns record


=== 6. Start Rspamd: ===
mkdir -p /var/lib/rspamd/dkim
rspamadm dkim_keygen -s ${SELECTOR} -t ED25519 -d ${MAILDOMAIN} -k /var/lib/rspamd/dkim/${MAILDOMAIN}-${SELECTOR}.key > /var/lib/rspamd/dkim/${MAILDOMAIN}-${SELECTOR}.pub
chown -R rspamd:grommunio /var/lib/rspamd/dkim
chmod 640 /var/lib/rspamd/dkim/${MAILDOMAIN}-${SELECTOR}.key
cat /var/lib/rspamd/dkim/${MAILDOMAIN}-${SELECTOR}.pub
 
 
=== Start Rspamd and Test ===


   rc-update add rspamd
   rc-update add rspamd
   rcctl start rspamd
   rcctl start rspamd


== 9. Finalize and Verify Installation ==


=== 1. Restart Services: ===
Test rspam client connection getting statistics (you need to wait some minutes until stats are available):
 
#rspamc -h /run/rspamd/worker-controller.sock stat
rspamc stat
 
 
 
== 9. Finalize and Verify ==
 
=== Restart Services ===
Restart all services:
Restart all services:


  rcctl restart postfix saslauthd rspamd valkey@grommunio nginx php-fpm83 gromox-delivery gromox-event \
rcctl restart postfix saslauthd rspamd valkey@grommunio nginx php-fpm83 gromox-delivery gromox-event \
    gromox-http gromox-imap gromox-midb gromox-pop3 gromox-delivery-queue gromox-timer gromox-zcore \
    gromox-http gromox-imap gromox-midb gromox-pop3 gromox-delivery-queue gromox-timer gromox-zcore \
    grommunio-admin-api
    grommunio-admin-api




=== 2. Verify Service Status: ===
=== Verify Service Status ===
Check the status of all services:
Check the status of all services:


  rcctl status
rcctl status




=== 3. Check Logs: ===
=== Check Logs ===
Inspect logs for any errors or issues:
Inspect logs for any errors or issues:


  find /var/log -type f | xargs tail -n50 | grep -iE '==>|fail|crit|error|alert|corrupt|warning'
find /var/log -type f | xargs tail -n50 | grep -iE '==>|fail|crit|error|alert|corrupt|warning'
 
 
=== Web UI Access ===
Admin UI: https://mail.example.local:8443
 
Web UI: https://mail.example.local
 
 
=== Admin UI - First steps ===
Log in with user 'admin' and the previously created ADMIN_PASS
 
Create and change the following entities:
 
# '''Defaults:''' Set the overall defaults to be applied to all domains and users. If you use PAM, ensure that the flag 'Allow SMTP sending (used by POP3/IMAP clients)' is activated
# Create an '''Organization'''
# Create a '''Domain''' belonging to this organization. Select as well "Create domain admin role"
# Create '''Users''' belonging to the domain
 
 
NOTE: For some reason, the first user is not created properly. Permissions are wrong and the sqlite database is not created. It is suggested to create a second user, ensure that the permissions are set correctly and then delete and recreate the first user
Correct user permissions are like follows:
 
ls -l /var/lib/gromox/user/example.com
drwxrwx---    8 grommuni gromox      4.0K Jun 21 14:05 user1
ls -l /var/lib/gromox/user/example.com/user1
drwxrwx---    8 grommuni gromox      4.0K Jun 21 14:05 .
drwxr-xr-x    4 grommuni gromox      4.0K Jun 21 14:05 ..
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 cid
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 config
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 eml
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 exmdb
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 ext
-rw-r--r--    1 gromox  gromox        0 Jun 21 14:05 tables.sqlite3
drwxrwx---    4 grommuni gromox      4.0K Jun 21 14:05 tmp
 
 
=== Web UI Testing ===
 
Verify if you can access the web UI with your new user
 
 
=== Test saslauthd authentication ===
 
Finally, test saslauthd authentication with PAM
 
testsaslauthd -u username -r domain -p password -s smtp
testsaslauthd -u username@domain -p password -s smtp
 
 
=== Add/verify the license ===


In case you have a license you can configure it in the admin UI under grommunio settings:
https://mail.example.local:8443/license


=== 4. Web UI Access: ===
Admin UI: [https://mail.example.local:8443](https://mail.example.local:8443)


== 10. End User Configuration ==
The default (fallback) community license is defined in the following file
vi /usr/share/grommunio-admin-api/tools/license.py


=== 1. Admin UI: ===
== See Also ==
Log into the Admin UI with the username `admin` and the previously created `ADMIN_PASS`.


=== 2. License Configuration: ===
[[Category:Server]]
If you have a license, you can configure it under '''Grommunio settings''' in the Admin UI.
[[Category:Mail]]

Latest revision as of 17:05, 3 December 2024

This tutorial covers the steps to set up a mail server on Alpine Linux using grommunio, an open-source groupware solution that supports email, calendar, and task management. Grommunio stands out with its unique MAPI support, enabling seamless integration with Microsoft Outlook and other MAPI clients, making it an ideal choice for open-source alternatives to proprietary systems. The setup includes essential components like MariaDB, Nginx, PHP, and Postfix to create a fully functional mail server. Follow along to build a secure, scalable communication platform using grommunio's powerful features.

Prerequisites

Before proceeding with the installation, ensure you have a fresh Alpine Linux system setup. You'll need root privileges to execute these commands.

Procedure

  1. Install and configure MariaDB
  2. MariaDB performance tuning (optional)
  3. Install and configure Nginx
  4. Install and configure PHP
  5. Install and configure Postfix
  6. Install and configure Grommunio
  7. Configure Valkey (Redis replacement)
  8. Install and configure Rspamd
  9. Finalize and verify installation


1. Install and Configure MariaDB

Install MariaDB

To start, install MariaDB and necessary utilities 

apk add mariadb mariadb-client mariadb-server-utils


Define the variables used later in the setup setup and configuration.

The default datapath is `/var/lib/mysql` and contains the entire database. If you prefer another location define it here and create a symlink. In any case, the grommunio database will be rather small as it only contains the configuration. 

DB_DATA_PATH="/srv/mysql"
DB_ROOT_PASS="Passw0rd1"
DB_USER="admin"
DB_PASS="Passw0rd2"


Setup the default system tables: 

sudo mysql_install_db --user=mysql --datadir=${DB_DATA_PATH}


Set a symlink to the standard mysql data directory for compatibility reason: 

ln -s /srv/mysql /var/lib/mysql


Restart service: 

rc-service mariadb restart


Run the built-in security script:

Set the new root password to the one defined above and answer everything with 'y' 

sudo mysql_secure_installation


Create MariaDB User

Create a new user for Grommunio and assign privileges: 

echo "GRANT ALL ON *.* TO ${DB_USER}@'127.0.0.1' IDENTIFIED BY '${DB_PASS}' WITH GRANT OPTION;" > /tmp/sql
echo "GRANT ALL ON *.* TO ${DB_USER}@'localhost' IDENTIFIED BY '${DB_PASS}' WITH GRANT OPTION;" >> /tmp/sql
echo "GRANT ALL ON *.* TO ${DB_USER}@'::1' IDENTIFIED BY '${DB_PASS}' WITH GRANT OPTION;" >> /tmp/sql
echo "DELETE FROM mysql.user WHERE User=;" >> /tmp/sql
echo "FLUSH PRIVILEGES;" >> /tmp/sql
cat /tmp/sql | mysql -u root --password="${DB_ROOT_PASS}"


Configure MariaDB

Edit the MariaDB configuration for better performance: 

vi /etc/my.cnf.d/mariadb-server.cnf


Add the following configuration: 

[mysqld]
#skip-networking

## Configuration for grommunio (most values are default)
innodb_log_buffer_size=16M
innodb_log_file_size=32M
innodb_read_io_threads=4
innodb_write_io_threads=4

join_buffer_size=512K
query_cache_size=0
query_cache_type=0
query_cache_limit=2M

# Activate performance schema
performance_schema=ON

# Bind to localhost only
bind-address = 127.0.0.1

# Disable DNS lookups as we only use localhost connections
skip-name-resolve=ON


Create a default charset configuration for MariaDB: 

cat > /etc/my.cnf.d/mariadb-server-default-charset.cnf << EOF
[client]
default-character-set = utf8mb4

[mysqld]
collation_server = utf8mb4_general_ci
character_set_server = utf8mb4

[mysql]
default-character-set = utf8mb4
EOF


Restart MariaDB and enable it to start on boot: 

rc-update add mariadb default
rc-service mariadb restart


Verify MariaDB Setup

Check if the MariaDB listener is running and bound to the correct interface (127.0.0.1): 

ss -tulpn

Create Grommunio Database

Define the database parameters and create the Grommunio database: 

MYSQL_HOST="localhost"
MYSQL_USER="grommunio"
MYSQL_PASS="Passw0rd3"
MYSQL_DB="grommunio"

echo "create database $MYSQL_DB character set 'utf8mb4';" > /tmp/sql
echo "grant select, insert, update, delete, create, drop, index, alter, create temporary tables, lock tables on $MYSQL_DB.* TO $MYSQL_USER@$MYSQL_HOST identified by '$MYSQL_PASS';" >> /tmp/sql
echo "flush privileges;" >> /tmp/sql
cat /tmp/sql | mysql -u admin --password="${DB_PASS}"


Test the database connection: 

mysql -hlocalhost -u grommunio -p${MYSQL_PASS} grommunio


2. MariaDB Performance Tuning (Optional)

To assist us in checking and tuning the configuration as per our specific needs, we can install mysqltuner, a script that will provide suggestions to improve the performance of our database server and increase its stability

Download MySQLTuner

wget -v https://raw.githubusercontent.com/major/MySQLTuner-perl/master/mysqltuner.pl -O /tmp/mysqltuner.pl


Move it to the correct directory and set permissions: 

mv /tmp/mysqltuner.pl /usr/local/bin/mysqltuner.pl
chmod 755 /usr/local/bin/mysqltuner.pl


Install perl

NOTE: The perl-doc package is installed because it's the only one containing the perldiag.pod required by mysqltuner.pl 

apk add perl perl-doc


Execute the script

You will be prompted to enter the credentials of your administrative MariaDB account: 

/usr/local/bin/mysqltuner.pl --user admin --pass ${DB_PASS}


3. Install and Configure Nginx

Install Nginx

Install the necessary Nginx modules: 

apk add nginx nginx-mod-http-headers-more nginx-mod-http-vts nginx-mod-http-brotli


Configure Nginx

Backup the original Nginx configuration and edit it for security headers and TLS settings: 

cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.orig
vi /etc/nginx/nginx.conf


Add the following configuration: 

#error_log /var/log/nginx/error.log warn;
error_log syslog:server=unix:/dev/log,facility=local2,nohostname warn;

### Common headers for security
# TODO: Set temporary to a lower value until we are sure it's working
#more_set_headers "Strict-Transport-Security : max-age=15768000; includeSubDomains; preload";
more_set_headers "Strict-Transport-Security : max-age=2592000; includeSubDomains;";
more_set_headers "X-Frame-Options : SAMEORIGIN";
more_set_headers "Content-Security-Policy : default-src https: data: 'unsafe-inline' 'unsafe-eval' always";
more_set_headers "X-Xss-Protection : 1; mode=block";
more_set_headers "X-Content-Type-Options : nosniff";
more_set_headers "Referrer-Policy : strict-origin-when-cross-origin";
more_set_headers "Server : Follow the white rabbit.";

### TLS settings
ssl_protocols TLSv1.2 TLSv1.3;
ssl_session_cache shared:SSL:1m;
ssl_session_timeout 5m;

log_format main_ssl '$remote_addr - $remote_user [$time_local] "$request" '
        '$status $body_bytes_sent "$http_referer" '
        '"$http_user_agent" "$http_x_forwarded_for" '
        'client_ciphers="$ssl_ciphers" client_curves="$ssl_curves"';

#access_log /var/log/nginx/access.log main_ssl; # Disabled for performance
#access_log syslog:server=unix:/dev/log,facility=local2,nohostname main; # Disabled for performance
access_log off;


Disable the default page by renaming it: 

mv /etc/nginx/http.d/default.conf /etc/nginx/http.d/default.orig


Restart Nginx and enable it to start on boot: 

rc-update add nginx
rc-service nginx restart


4. Install and Configure PHP

Install PHP

Install the basic php packages. The modules are installed as grommunio dependencies: 

apk add php83 php83-fpm

Disable default fpm conf: 

mv /etc/php83/php-fpm.d/www.conf /etc/php83/php-fpm.d/www.conf.default


Harden PHP Configuration

Backup config file /etc/php83/php.ini 

cp /etc/php83/php.ini /etc/php83/php-fpm.d/php.ini.orig


Disable remote PHP code execution: 

sed 's/^;\?\(allow_url_fopen\).*/\1 = Off/' -i /etc/php83/php.ini 
sed 's/^;\?\(allow_url_include\).*/\1 = Off/' -i /etc/php83/php.ini


Disable information leakage: 

sed 's/^;\?\(expose_php\).*/\1 = Off/' -i /etc/php83/php.ini


Configure Error handling: 

sed 's/^;\?\(display_errors\).*/\1 = Off/' -i /etc/php83/php.ini 
sed 's/^;\?\(display_startup_errors\).*/\1 = Off/' -i /etc/php83/php.ini 
sed 's/^;\?\(log_errors\).*/\1 = On/' -i /etc/php83/php.ini 
sed 's/^;\?\(error_log = syslog\).*/\1/' -i /etc/php83/php.ini


PHP Resource Control (Optional): 

#sed 's/^\(max_execution_time\).*/\1 = 25/' -i /etc/php83/php.ini 
#sed 's/^\(max_input_time\).*/\1 = 25/' -i /etc/php83/php.ini 
#sed 's/^\(memory_limit\).*/\1 = 30M/' -i /etc/php83/php.ini 
#sed 's/^\(post_max_size\).*/\1 = 1M/' -i /etc/php83/php.ini 
#sed 's/^;\?\(max_input_vars\).*/\1 = 1000/' -i /etc/php83/php.ini


Disable vulnerable functions: 

sed 's/^\(disable_functions\).*/\1 = apache_note, apache_setenv, chgrp, curl_multi_exec, define_sys, define_syslog_variables, debugger_off, debugger_on, diskfreespace, _getppid, escapeshellarg, escapeshellcmd, exec, getmyuid, ini_restore, leak, listen, parse_ini_file, passthru, pcntl_alarm, pcntl_async_signals, pcntl_exec, pcntl_fork, pcntl_get_last_error, pcntl_getpriority, pcntl_setpriority, pcntl_signal, pcntl_signal_dispatch, pcntl_signal_get_handler, pcntl_sigprocmask, pcntl_sigtimedwait, pcntl_sigwaitinfo, pcntl_strerror, pcntl_unshare, pcntl_wait, pcntl_waitpid, pcntl_wexitstatus, pcntl_wifcontinued, pcntl_wifexited, pcntl_wifsignaled, pcntl_wifstopped, pcntl_wstopsig, pcntl_wtermsig, posix, posix_ctermid, posix_getcwd, posix_getegid, posix_geteuid, posix_getgid, posix_getgrgid, posix_getgrnam, posix_getgroups, posix_getlogin, posix_getpgid, posix_getpgrp, posix_getpid, posix_getpwnam, posix_getpwuid, posix_getrlimit, posix_getsid, posix_isatty, posix_kill, posix_mkfifo, posix_setegid, posix_seteuid, posix_setgid, posix_setpgid, posix_setsid, posix_setuid, posix_times, posix_ttyname, posix_uname, popen, proc_close, proc_get_status, proc_nice, proc_open, proc_terminate, shell_exec, show_source, system, url_exec/' -i /etc/php83/php.ini


Harden Session Security: 

sed 's/^;\?\(session.use_strict_mode\).*/\1 = 1/' -i /etc/php83/php.ini 
sed 's/^;\?\(session.use_cookies\).*/\1 = 1/' -i /etc/php83/php.ini 
sed 's/^;\?\(session.cookie_secure\).*/\1 = 1/' -i /etc/php83/php.ini 
sed 's/^;\?\(session.use_only_cookies\).*/\1 = 1/' -i /etc/php83/php.ini 
sed 's/^;\?\(session.cookie_httponly\).*/\1 = 1/' -i /etc/php83/php.ini


5. Install and Configure Postfix

Install Postfix

Install the required packages: 

apk add postfix postfix-mysql postfix-pcre


Configure Postfix

First backup the original files: 

mv /etc/postfix/main.cf /etc/postfix/main.cf.orig
mv /etc/postfix/master.cf /etc/postfix/master.cf.orig
mv /etc/postfix/header_checks /etc/postfix/header_checks.orig


Download the prepared configuration files: 

wget https://alpinelinuxsupport.com/downloads/postfix-configuration-files.zip


Copy the prepared configuration files to `/etc/postfix/` and adapt the configuration to your environment. Ensure you change at least the following values: 

main.cf: myhostname, mynetworks, smtp_tls_chain_files, smtpd_tls_chain_files, local_recipient_maps, mydestination, 
        virtual_*, relayhost, mua_sender_restrictions, smtpd_recipient_restrictions
master.cf: smtpd_tls_chain_files=/etc/ssl/private/internal-server-key-and-cert.pem


Create the required postmap files: 

newaliases
postmap /etc/postfix/transport


Run Postfix setup: 

newaliases
postmap /etc/postfix/transport


Enable the postfix service and restart: 

rc-update add postfix
rc-service postfix restart

Verify Postfix Logs

Check the Postfix logs for any errors: 

tail -f /var/log/maillog


6. Install and Configure Grommunio

Enable IPv6

First of all, turn on ipv6 which is mandatory for grommunio daemons

Edit `/etc/hosts` to include IPv6 localhost: 

vi /etc/hosts
-----
::1		localhost ipv6-localhost ipv6-loopback


Ensure IPv6 is enabled in `/etc/sysctl.conf`: 

sed -i 's/^net\.ipv6\.conf\..*\.disable_ipv6\s=\s1/#&/' /etc/sysctl.conf
sysctl -p
ping ::1  # Test if IPv6 is working


Specify Database Parameters

Specify DB parameters if necessary (already specified above in step 1) 

MYSQL_HOST="localhost"
MYSQL_USER="grommunio"
MYSQL_PASS="Passw0rd3"
MYSQL_DB="grommunio"


Specify Domain Parameters

The FQDN is for example used by Outlook clients to connect. This name will have to be present in the used certificate.

The default Mail Domain is for example used for Non-Delivery Reports and for generation of some simple TLS certificates. Specify ONLY ONE domain here.

Adjust the following for your specific setup: 

FQDN="mail.example.local"
MAILDOMAIN="example.com"
RELAYHOST="123.123.123.1"
ADMIN_PASS="Passw0rd4"


Install Packages

Install necessary dependencies (util-linux-login is required to get pam.d working): 

apk add valkey valkey-cli cyrus-sasl cyrus-sasl-login util-linux-login


Install grommunio packages: 

apk add grommunio-gromox grommunio-web grommunio-admin-api grommunio-admin-web grommunio-index grommunio-error-pages


Optionally, install deprecated ActiveSync if needed: 

apk add grommunio-dav grommunio-sync


Relocate Mail Storage

The directory `/var/lib/gromox` will be the largest directory containing all the mails and attachments. We therefore relocate it to another disk and create a symlink: 

mv /var/lib/gromox /srv/gromox
ln -s /srv/gromox /var/lib/gromox


Enable Required Services

Enable all required services: 

rc-update add grommunio-admin-api
rc-update add gromox-delivery
rc-update add gromox-delivery-queue
rc-update add gromox-event
rc-update add gromox-http
rc-update add gromox-imap
rc-update add gromox-midb
rc-update add gromox-pop3
rc-update add gromox-timer
rc-update add gromox-zcore
rc-update add valkey@grommunio
rc-update add php-fpm83 
rc-update add saslauthd


Configure Grommunio

Modify the configuration files with the custom parameters specified above.

Configure gromox *.cfg: 

sed -i "s/mail.example.local/${FQDN}/g" /etc/gromox/*.cfg
sed -i "s/example.com/${MAILDOMAIN}/g" /etc/gromox/*.cfg


Configure gromox adaptor: 

sed -i "s/<password>/${MYSQL_PASS}/g" /etc/gromox/mysql_adaptor.cfg
cat /etc/gromox/mysql_adaptor.cfg


Configure autodiscovery: 

sed -i "s/mail.example.local/${FQDN}/g" /etc/gromox/autodiscover.ini
sed -i "s/<password>/${MYSQL_PASS}/g" /etc/gromox/autodiscover.ini
cat /etc/gromox/autodiscover.ini


Prepare additional postfix file for sender maps: 

cp -p /etc/postfix/grommunio-virtual-mailbox-maps.cf /etc/postfix/grommunio-virtual-mailbox-sender-maps.cf
sed -i '/^query =/d' /etc/postfix/grommunio-virtual-mailbox-sender-maps.cf
echo "query = SELECT username FROM users WHERE username='%s' UNION SELECT aliasname FROM aliases WHERE mainname='%s'" >> /etc/postfix/grommunio-virtual-mailbox-sender-maps.cf


Configure postfix files: 

sed -i "s/<password>/${MYSQL_PASS}/g" /etc/postfix/grommunio*.cf


Configure TLS certificates: 

sed -i "s/mail.example.local/${FQDN}/g" /etc/grommunio-common/nginx/ssl_certificate.conf
sed -i "s/mail.example.local/${FQDN}/g" /etc/grommunio-admin-common/nginx-ssl.conf


Link TLS certificate configuration:

Since both ssl files are identical it might make more sense to link them 

ln -s /etc/grommunio-common/nginx/ssl_certificate.conf /etc/grommunio-admin-common/nginx-ssl.conf


Configure grommunio admin: 

sed -i "s/mail.example.local/${FQDN}/g" /etc/grommunio-admin-common/config.json
sed -i "s/<password>/${MYSQL_PASS}/g" /etc/grommunio-admin-api/conf.d/database.yaml
cat /etc/grommunio-admin-api/conf.d/database.yaml


Prepare external or self-signed certificate and put them to: 

/etc/ssl/certs/${FQDN}.cert.pem
/etc/ssl/private/${FQDN}.key.pem


Concatenate key and cert as needed by postfix: 

cat /etc/ssl/private/${FQDN}.key.pem \
    /etc/ssl/certs/${FQDN}.cert.pem \
  > /etc/ssl/private/${FQDN}.key_cert.pem
chmod 640 /etc/ssl/private/*.key_cert.pem
chown root:ssl-cert /etc/ssl/private/*.key_cert.pem
ls -al /etc/ssl/private/


Add gromox to ssl-cert (or another) group allowed to read the private keys: 

addgroup gromox ssl-cert


Retrieve the certificate fingerprint:

NOTE: This is only required if you work with a relay server authenticating the client cert.

Add the output to the relay_clientcerts file on the relay server and hash it with the postmap command. 

openssl x509 -noout -fingerprint -sha384 -in /etc/ssl/certs/${FQDN}.cert.pem


Configure PAM for SMTP: 

mv /etc/pam.d/smtp /etc/pam.d/smtp.orig
cat > /etc/pam.d/smtp <<EOF
#%PAM-1.0
# config for grommunio auth services
auth    required pam_gromox.so service=smtp
account required pam_permit.so
EOF


Configure SASL authentication: 

cat > /etc/conf.d/saslauthd <<EOF
# Configuration for /etc/init.d/saslauthd
SASLAUTHD_OPTS="-a pam -r"
EOF


SASL configuration for SMTP service: 

mkdir /etc/sasl2
cat > /etc/sasl2/smtpd.conf <<EOF
pwcheck_method: saslauthd
mech_list: plain login
EOF
chmod 600 /etc/sasl2/smtpd.conf


In case you migrate from another server replace X500-org-name with the original one: 

X500_ORG_NAME_OLD=$(grep 'x500_org_name=' /etc/gromox/zcore.cfg | cut -d= -f2)
X500_ORG_NAME_NEW=<original-key>
sed -i "s/$X500_ORG_NAME_OLD/$X500_ORG_NAME_NEW/g" /etc/gromox/*


Initialize Database

Initialize the database: 

gromox-dbop -C


Set the Grommunio admin password: 

grommunio-admin passwd --password "${ADMIN_PASS}"


Add grommunio to the adm group to enable admin UI to read `/var/log/maillog`.

NOTE: Additional custom patch is needed to make the log monitoring work 

addgroup grommunio adm


Configure Firewall

Open the necessary firewall ports: 

25/tcp
80/tcp
110/tcp
143/tcp
443/tcp
587/tcp
993/tcp
995/tcp
8080/tcp
8443/tcp


7. Configure Valkey

Enable Syslog

The syslog facility is set to 'local0'.

NOTE: It is recommended to redirect local0 to the maillog in syslog.conf as all other grommunio processes write to maillog 

vi /etc/valkey/grommunio.conf
-----
#pidfile /var/run/valkey/default.pid
#logfile /var/log/valkey/default.log
syslog-enabled yes
syslog-ident valkey
syslog-facility local0


Enable Memory Overcommit

Add the following sysctl property for valkey 

 vi /etc/sysctl.conf
 -----
 # Enable memory overcommit for valkey  
 vm.overcommit_memory = 1


Update the system configuration 

sysctl -p


Start Valkey and Test

rcctl restart valkey@grommunio
valkey-cli ping  # Expected result: 'PONG'


8. Install and Configure Rspamd

Install Rspamd

 apk add rspamd rspamd-client


Configure Rspamd

Set general options: 

cat > /etc/rspamd/local.d/options.inc <<EOF
dns {
  enable_dnssec = true;
  timeout = 4s;
  retransmits = 5;
}
EOF


Configure redis/valkey connection: 

cat > /etc/rspamd/local.d/redis.conf <<EOF
read_servers = "127.0.0.1";
write_servers = "127.0.0.1";
EOF


Configure normal worker: 

cat > /etc/rspamd/local.d/worker-normal.inc << EOF
# Normal worker is intended to scan messages for spam
# You might disable normal worker to free up system resources as we use the proxy worker in self-scan mode
enabled = false;
# If the mailer is running on the same host use a unix socket
#bind_socket = "127.0.0.1:11333";
#bind_socket = "/var/run/rspamd/worker-normal.sock mode=0660 owner=rspamd";
EOF


Configure proxy worker: 

cat > /etc/rspamd/local.d/worker-proxy.inc << EOF
# Proxy worker is used as postfix milter
# If the mailer is running on the same host use a unix socket
milter = yes;
#bind_socket = "127.0.0.1:11332";
bind_socket = "/var/run/rspamd/worker-proxy.sock mode=0660 owner=rspamd";
timeout = 120s;
upstream "local" {
  default = yes; # Self-scan upstreams are always default
  self_scan = yes; # Enable self-scan
}
count = 4; # Spawn more processes in self-scan mode
EOF


Add postfix to rspamd group to access the socket: 

addgroup postfix rspamd


Configure controller worker: 

cat > /etc/rspamd/local.d/worker-controller.inc << EOF
# Controller worker is used to manage rspamd stats, to learn rspamd and to serve WebUI
# If the mailer is running on the same host use a unix socket
# NOTE: grommunio connects over http
bind_socket = "127.0.0.1:11334";
#bind_socket = "/var/run/rspamd/worker-controller.sock mode=0660 owner=rspamd";
# password for read-only commands
password = "<encrypted_password_string>";
# password for write commands
enable_password = "<encrypted_password_string>"
secure_ip = "127.0.0.1";
EOF


Create the user password and replace it in worker-controller.inc:

Command: rspamadm pw --encrypt -p P4ssword 

sed -i s/\<encrypted_password_string\>/$(rspamadm pw --encrypt -p "${ADMIN_PASS}")/ /etc/rspamd/local.d/worker-controller.inc
cat /etc/rspamd/local.d/worker-controller.inc


Redirect rspamd logs to syslog: 

cat > /etc/rspamd/local.d/logging.inc << EOF
# Redirect rspamd logs to the mail log
type = "syslog";
facility = "mail";
level = "notice";
EOF


Configure external relay: 

cat > /etc/rspamd/local.d/external_relay.conf << EOF
enabled = true;
rules {
  FETCHMAIL {
    strategy = "local";
  }
}
EOF


Configure actions: 

cat > /etc/rspamd/local.d/actions.conf << EOF
reject = 15; # Reject when reaching this score
add_header = 4; # Add spam header when reaching this score
greylist = 3; # Apply greylisting when reaching this score (will emit 'soft reject action')

#rewrite_subject = 6; # Rewrite subject to indicate spam. Cannot be combined with add_header
#unknown_weight = 1.0; # Enable if need to set score for all symbols implicitly
#subject = "***SPAM*** %s"; # Set rewrite subject to this value (%s is replaced by the original subject)
EOF


Configure milter_headers: 

cat > /etc/rspamd/local.d/milter_headers.conf << EOF
# Enables x-spamd-result, x-rspamd-server and x-rspamd-queue-id headers (default false)
extended_spam_headers = true;

# Set false to always add headers for local IPs (default true)
skip_local = false;

# Set false to always add headers for authenticated users (default true)
skip_authenticated = false;

# Set false to keep pre-existing spam flag added by an upstream spam filter (default true)
remove_upstream_spam_flag = true;
EOF


Configure dkim signing: 

cat > /etc/rspamd/local.d/dkim_signing.conf << EOF
# Enable DKIM signing
enabled = true;

# If false, messages with empty envelope from are not signed
allow_envfrom_empty = true;

# If true, envelope/header domain mismatch is ignored
allow_hdrfrom_mismatch = true;

# If true, multiple from headers are allowed (but only first is used)
allow_hdrfrom_multiple = false;

# If true, username does not need to contain matching domain
allow_username_mismatch = true;

# Default path to key, can include '$domain' and '$selector' variables
path = "/var/lib/rspamd/dkim/\$domain-\$selector.key";

# Default selector to use
selector = "dkim";

# If false, messages from authenticated users are not selected for signing
sign_authenticated = true;

# If false, messages from local networks are not selected for signing
sign_local = false;

# Map file of IP addresses/subnets to consider for signing
#sign_networks = "/some/file"; # or url

# Symbol to add when message is signed
symbol = "DKIM_SIGNED";

# If false, messages from domains not defined here will not be signed
try_fallback = false;

# Domain to use for DKIM signing: can be "header" (MIME From), "envelope" (SMTP From), 
#   "recipient" (SMTP To), "auth" (SMTP username) or directly specified domain name
use_domain = "header";

# Domain to use for DKIM signing when sender is in sign_networks ("header"/"envelope"/"auth")
#use_domain_sign_networks = "header";

# Domain to use for DKIM signing when sender is a local IP ("header"/"envelope"/"auth")
#use_domain_sign_local = "header";

# Whether to normalise domains to eSLD
use_esld = true;

# Whether to get keys from Redis
use_redis = false;

# Hash for DKIM keys in Redis
key_prefix = "DKIM_KEYS";

# map of domains -> names of selectors (since rspamd 1.5.3)
#selector_map = "/etc/rspamd/dkim_selectors.map";

# map of domains -> paths to keys (since rspamd 1.5.3)
#path_map = "/etc/rspamd/dkim_paths.map";

# If `true` get pubkey from DNS record and check if it matches private key
check_pubkey = false;

# Set to `false` if you want to skip signing if public and private keys mismatch
allow_pubkey_mismatch = true;

# Domain specific settings
domain {
  <maildomain> { selector = "<selector>"; }
}
EOF


Specify parameters (MAILDOMAIN already defined above): 

MAILDOMAIN="example.com"
SELECTOR="202406"


Replace maildomain and selector in configuration: 

sed -i "s/<maildomain>/${MAILDOMAIN}/g" /etc/rspamd/local.d/dkim_signing.conf
sed -i "s/<selector>/${SELECTOR}/g" /etc/rspamd/local.d/dkim_signing.conf


Create DKIM Key Pair:

NOTE: The 'pub' file contains the public key and the configuration to create the corresponding dns record 

mkdir -p /var/lib/rspamd/dkim
rspamadm dkim_keygen -s ${SELECTOR} -t ED25519 -d ${MAILDOMAIN} -k /var/lib/rspamd/dkim/${MAILDOMAIN}-${SELECTOR}.key > /var/lib/rspamd/dkim/${MAILDOMAIN}-${SELECTOR}.pub
chown -R rspamd:grommunio /var/lib/rspamd/dkim
chmod 640 /var/lib/rspamd/dkim/${MAILDOMAIN}-${SELECTOR}.key
cat /var/lib/rspamd/dkim/${MAILDOMAIN}-${SELECTOR}.pub


Start Rspamd and Test

 rc-update add rspamd
 rcctl start rspamd


Test rspam client connection getting statistics (you need to wait some minutes until stats are available): 

#rspamc -h /run/rspamd/worker-controller.sock stat
rspamc stat


9. Finalize and Verify

Restart Services

Restart all services: 

rcctl restart postfix saslauthd rspamd valkey@grommunio nginx php-fpm83 gromox-delivery gromox-event \
    gromox-http gromox-imap gromox-midb gromox-pop3 gromox-delivery-queue gromox-timer gromox-zcore \
    grommunio-admin-api


Verify Service Status

Check the status of all services: 

rcctl status


Check Logs

Inspect logs for any errors or issues: 

find /var/log -type f | xargs tail -n50 | grep -iE '==>|fail|crit|error|alert|corrupt|warning'


Web UI Access

Admin UI: https://mail.example.local:8443

Web UI: https://mail.example.local


Admin UI - First steps

Log in with user 'admin' and the previously created ADMIN_PASS

Create and change the following entities:

  1. Defaults: Set the overall defaults to be applied to all domains and users. If you use PAM, ensure that the flag 'Allow SMTP sending (used by POP3/IMAP clients)' is activated
  2. Create an Organization
  3. Create a Domain belonging to this organization. Select as well "Create domain admin role"
  4. Create Users belonging to the domain


NOTE: For some reason, the first user is not created properly. Permissions are wrong and the sqlite database is not created. It is suggested to create a second user, ensure that the permissions are set correctly and then delete and recreate the first user

Correct user permissions are like follows: 

ls -l /var/lib/gromox/user/example.com
drwxrwx---    8 grommuni gromox      4.0K Jun 21 14:05 user1

ls -l /var/lib/gromox/user/example.com/user1
drwxrwx---    8 grommuni gromox      4.0K Jun 21 14:05 .
drwxr-xr-x    4 grommuni gromox      4.0K Jun 21 14:05 ..
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 cid
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 config
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 eml
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 exmdb
drwxrwx---    2 grommuni gromox      4.0K Jun 21 14:05 ext
-rw-r--r--    1 gromox   gromox         0 Jun 21 14:05 tables.sqlite3
drwxrwx---    4 grommuni gromox      4.0K Jun 21 14:05 tmp


Web UI Testing

Verify if you can access the web UI with your new user


Test saslauthd authentication

Finally, test saslauthd authentication with PAM 

testsaslauthd -u username -r domain -p password -s smtp
testsaslauthd -u username@domain -p password -s smtp


Add/verify the license

In case you have a license you can configure it in the admin UI under grommunio settings: 

https://mail.example.local:8443/license


The default (fallback) community license is defined in the following file 

vi /usr/share/grommunio-admin-api/tools/license.py

See Also

Retrieved from "https://wiki.alpinelinux.org/w/index.php?title=Grommunio_Mail_Server&oldid=28024"