#!/bin/bash

ESC_SEQ="\x1b["
COL_RESET=$ESC_SEQ"39;49;00m"
COL_RED=$ESC_SEQ"31;01m"
COL_GREEN=$ESC_SEQ"32;01m"
COL_YELLOW=$ESC_SEQ"33;01m"

if [ "$UID" -ne 0 ]
  then echo "Please run as root"
  exit
fi

function error_check {
    if [ "$?" = "0" ]; then
        echo -e "$COL_GREEN OK. $COL_RESET"
    else
        echo -e "$COL_RED An error has occured. $COL_RESET"
        read -p "Press enter or space to ignore it. Press any other key to abort." -n 1 key

        if [[ $key != "" ]]; then
            exit
        fi
    fi
}


echo "You are about to install and configure Postfix virtual system with imap support (via Dovecot)."
echo "This script was made for Debian 7, but was adapted for Ubuntu 18.04 LTS [09/07/2018]."

echo "Updating system"
apt-get update
apt-get upgrade

echo "Adding group:"
groupadd -g 5000 vmail
error_check

echo "Adding group:"
useradd -u 5000 -g vmail -s /usr/bin/nologin -d /home/vmail -m vmail
error_check

echo "Installing programs:"
apt-get install postfix dovecot-core dovecot-imapd postgresql postfix-pgsql dovecot-lmtpd dovecot-pgsql
error_check

#echo "Preparing database:"

DBPASS=$(date | md5sum | head -c 32)
CREATEUSER="CREATE USER postfix_user WITH PASSWORD '${DBPASS}';"
CREATEDB="CREATE DATABASE postfix_db;"
PERMISSDB="GRANT ALL PRIVILEGES ON DATABASE postfix_db TO postfix_user;"

sudo -u postgres psql -c "${CREATEUSER}"
error_check
sudo -u postgres psql -c "${CREATEDB}"
error_check
sudo -u postgres psql -c "${PERMISSDB}"
error_check

echo
echo "Please inform the main domain of your server, like 'example.com'"

read MAIN_DOMAIN

echo
echo "Please inform the Hostname of your machine like 'hostname.example.com'"
echo "It'll be needed to add an A entry for the hostname on the DNS zone"
echo

read HOST_NAME

echo "Creating postfix config files (/etc/postfix/main.cf):"
echo "myhostname = ${HOST_NAME}
mydomain = ${MAIN_DOMAIN}
mydestination = \$myhostname, localhost.\$mydomain, localhost
relay_domains =
virtual_alias_maps = proxy:pgsql:/etc/postfix/virtual_alias_maps.cf
virtual_mailbox_domains = proxy:pgsql:/etc/postfix/virtual_mailbox_domains.cf
virtual_mailbox_maps = proxy:pgsql:/etc/postfix/virtual_mailbox_maps.cf
virtual_mailbox_base = /home/vmail
virtual_mailbox_limit = 512000000
# message size is max 15M
message_size_limit = 15728640
virtual_minimum_uid = 5000
virtual_transport = dovecot
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000
local_transport = dovecot
local_recipient_maps = \$virtual_mailbox_maps
transport_maps = hash:/etc/postfix/transport

milter_default_action = accept
milter_protocol = 2
smtpd_milters = inet:localhost:8891
non_smtpd_milters = inet:localhost:8891 

smtp_tls_security_level = may
smtpd_sasl_auth_enable = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_sasl_security_options = noanonymous
smtpd_sasl_tls_security_options = \$smtpd_sasl_security_options
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/ssl/private/server.crt
smtpd_tls_key_file = /etc/ssl/private/server.key
smtpd_sasl_local_domain = \$mydomain
broken_sasl_auth_clients = yes
smtpd_tls_loglevel = 1
html_directory = /usr/share/doc/postfix/html
queue_directory = /var/spool/postfix" > /etc/postfix/main.cf
error_check

echo "Creating postfix config files (/etc/postfix/master.cf):"
echo "#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       -       -       -       smtpd
  -o smtpd_milters=inet:127.0.0.1:8891
#smtp      inet  n       -       -       -       1       postscreen
#smtpd     pass  -       -       -       -       -       smtpd
#dnsblog   unix  -       -       -       -       0       dnsblog
#tlsproxy  unix  -       -       -       -       0       tlsproxy
submission inet n       -       -       -       -       smtpd
#  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
smtps     inet  n       -       -       -       -       smtpd
#  -o syslog_name=postfix/smtps
  -o smtpd_tls_wrappermode=yes
  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_client_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#628       inet  n       -       -       -       -       qmqpd
pickup    fifo  n       -       -       60      1       pickup
cleanup   unix  n       -       -       -       0       cleanup
qmgr      fifo  n       -       n       300     1       qmgr
#qmgr     fifo  n       -       n       300     1       oqmgr
tlsmgr    unix  -       -       -       1000?   1       tlsmgr
rewrite   unix  -       -       -       -       -       trivial-rewrite
bounce    unix  -       -       -       -       0       bounce
defer     unix  -       -       -       -       0       bounce
trace     unix  -       -       -       -       0       bounce
verify    unix  -       -       -       -       1       verify
flush     unix  n       -       -       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       -       -       -       smtp
relay     unix  -       -       -       -       -       smtp
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       -       -       -       showq
error     unix  -       -       -       -       -       error
retry     unix  -       -       -       -       -       error
discard   unix  -       -       -       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       -       -       -       lmtp
anvil     unix  -       -       -       -       1       anvil
scache    unix  -       -       -       -       1       scache
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent.  See the pipe(8) man page for information about \${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
# To 'virtual' LDA:
#maildrop  unix  -       n       n       -       -       pipe
#  flags=DRhu user=vmail argv=/usr/bin/maildrop -d \${recipient}
#
# To Dovecot LDA:
dovecot   unix  -       n       n       -       -       pipe                                                                    
   flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/dovecot-lda -f \${sender} -d \${recipient}
#
# ====================================================================
#
# Recent Cyrus versions can use the existing \"lmtp\" master.cf entry.
#
# Specify in cyrus.conf:
#   lmtp    cmd=\"lmtpd -a\" listen=\"localhost:lmtp\" proto=tcp4
#
# Specify in main.cf one or more of the following:
#  mailbox_transport = lmtp:inet:localhost
#  virtual_transport = lmtp:inet:localhost
#
# ====================================================================
#
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
#
#cyrus     unix  -       n       n       -       -       pipe
#  user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m \${extension} \${user}
#
# ====================================================================
# Old example of delivery via Cyrus.
#
#old-cyrus unix  -       n       n       -       -       pipe
#  flags=R user=cyrus argv=/cyrus/bin/deliver -e -m \${extension} \${user}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a\$sender - \$nexthop!rmail (\$recipient)
#
# Other external delivery methods.
#
ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r \$nexthop (\$recipient)
bsmtp     unix  -       n       n       -       -       pipe
  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t\$nexthop -f\$sender \$recipient
scalemail-backend unix  -   n   n   -   2   pipe
  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store \${nexthop} \${user} \${extension}
mailman   unix  -       n       n       -       -       pipe
  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
  \${nexthop} \${user}

cleanup   unix  n       -       -       -       0       cleanup
subcleanup unix n       -       -       -       0       cleanup
 -o header_checks=regexp:/etc/postfix/submission_header_checks
" > /etc/postfix/master.cf
error_check

echo "Creating postfix config files (/etc/postfix/submission_header_checks):"
echo "/^Received:/ IGNORE
/^User-Agent:/ IGNORE" > /etc/postfix/submission_header_checks
error_check

echo "Creating postfix config files (/etc/postfix/virtual_alias_maps.cf):"
echo "user = postfix_user
password = ${DBPASS}
hosts = localhost
dbname = postfix_db
query = SELECT goto FROM alias WHERE address='%s' AND active = true
" > /etc/postfix/virtual_alias_maps.cf
error_check

echo "Creating postfix config files (/etc/postfix/virtual_mailbox_domains.cf):"
echo "user = postfix_user
password = ${DBPASS}
hosts = localhost
dbname = postfix_db
query = SELECT domain FROM domain WHERE domain='%s' AND backupmx = false AND active = true
" > /etc/postfix/virtual_mailbox_domains.cf
error_check

echo "Creating postfix config files (/etc/postfix/virtual_mailbox_maps.cf):"
echo "user = postfix_user
password = ${DBPASS}
hosts = localhost
dbname = postfix_db
query = SELECT maildir FROM mailbox WHERE username='%s' AND active = true
" > /etc/postfix/virtual_mailbox_maps.cf
error_check

echo "Creating dovecot config files (/etc/dovecot/dovecot.conf):"
echo "protocols = imap
auth_mechanisms = plain
passdb {
    driver = sql
    args = /etc/dovecot/dovecot-sql.conf
}
userdb {
    driver = sql
    args = /etc/dovecot/dovecot-sql.conf
}
service auth {
    unix_listener /var/spool/postfix/private/auth {
        group = postfix
        mode = 0660
        user = postfix
    }
    user = root
}
mail_home = /home/vmail/%d/%u
mail_location = maildir:~
ssl_cert = </etc/ssl/private/server.crt
ssl_key = </etc/ssl/private/server.key" > /etc/dovecot/dovecot.conf
error_check

echo "Creating dovecot config files (/etc/dovecot/dovecot-sql.conf):"
echo "driver = pgsql
connect = host=localhost dbname=postfix_db user=postfix_user password=${DBPASS}
default_pass_scheme = MD5-CRYPT
user_query = SELECT '/home/vmail/%d/%u' as home, 'maildir:/home/vmail/%d/%u' as mail, 5000 AS uid, 5000 AS gid, concat('dirsize:storage=',  quota) AS quota FROM mailbox WHERE username = '%u' AND active = '1'
password_query = SELECT username as user, password, '/home/vmail/%d/%u' as userdb_home, 'maildir:/home/vmail/%d/%u' as userdb_mail, 5000 as  userdb_uid, 5000 as userdb_gid FROM mailbox WHERE username = '%u' AND active = '1'
" > /etc/dovecot/dovecot-sql.conf
error_check

echo "Creating postmap:"
touch /etc/postfix/transport
postmap /etc/postfix/transport
error_check

read -p "Enter Postfix Admin and Roundcube installation path: " DOWNPATH

if [ ! -d ${DOWNPATH} ]; then
    mkdir -p ${DOWNPATH}
fi

echo "Checking if path is correct:"
cd ${DOWNPATH}
error_check

echo "Downloading postfixadmin:"
wget -O postfixadmin.tar.gz http://sourceforge.net/projects/postfixadmin/files/latest/download
error_check

echo "Unpacking postfixadmin:"
tar xvf postfixadmin.tar.gz -C ${DOWNPATH}
error_check

echo "Remove package and move extracted files:"
rm -rf postfixadmin.tar.gz
mv postfixadmin-* postfixadmin
error_check

echo "Create dir and setting permissions:"
mkdir postfixadmin/templates_c
chown -R www-data: postfixadmin/templates_c
error_check

echo "Downloading roundcube:"
wget https://github.com/roundcube/roundcubemail/releases/download/1.3.6/roundcubemail-1.3.6-complete.tar.gz
error_check

echo "Unpacking roundcube:"
tar xvf roundcubemail-1.3.6-complete.tar.gz -C ${DOWNPATH}
error_check

echo "Remove zip and move files to mail dir:"
rm -rf roundcubemail-1.3.6-complete.tar.gz
mv roundcubemail-* mail

echo "chown rights mail dir:"
chown -R www-data: mail/*
chown www-data mail/.htaccess
error_check


echo "Checking if php7.2-fpm is working:"
service php7.2-fpm restart
error_check

echo "Creating SSL certificate:"
cd /etc/ssl/private/
openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out server.key
chmod 400 server.key
error_check

openssl req -new -key server.key -out server.csr
openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt
chmod 444 server.crt
error_check

echo "Starting postfix daemon:"
/etc/init.d/postfix restart
error_check

echo "Starting dovecot daemon:"
/etc/init.d/dovecot restart
error_check

echo "Enabling services:"
update-rc.d postfix defaults
update-rc.d dovecot defaults
error_check


echo -e "$COL_GREEN Setup complete. $COL_RESET"
echo
echo "You should configure postfixadmin and roundcube."
echo "Use these settings:"
echo "database type: pgsql"
echo "database host: localhost"
echo "database user: postfix_user"
echo "database pass: ${DBPASS}"
echo "database name: postfix_db"
echo
echo "You must create the following database and user:"
echo
echo "USER: postfix_user"
echo "PASS: ${DBPASS}"
echo "DATABASE: postfix_db"
echo
echo "while in the postgres shell, you can create those with:"
echo "postgres# createuser -P postfix_user"
echo
echo "Past the password when it prompts"
echo
echo "postgres# createdb postfix_db -O postfix_user"
echo