#!/usr/bin/env bash

###############
#//
#// Users and directories
#//
###############
# Add users to groups
adduser dovecot mail >/dev/null
adduser ${MYVEMAIL_NGINX_USERGROUP} dovecot >/dev/null
adduser postfix opendkim >/dev/null

# Virtual mailboxes
mkdir /etc/postfix/sql

# MariaDB
install -m 1777 -d /run/mysqld

# DKIM/DMARC
mkdir /{run,etc}/{opendkim,opendmarc} >/dev/null 2>&1
install -o opendkim -g postfix -d /var/spool/postfix/opendkim/
install -m 750 -o opendmarc -g postfix -d /var/spool/postfix/opendmarc/

###############
#//
#// PHP
#//
###############
sed -e '/upload_max_filesize =/c upload_max_filesize = 0' \
    -e '/post_max_size =/c post_max_size = 0' \
    -e '/memory_limit =/c memory_limit = 4096M' \
    -i $(find /etc/php*/ -name 'php.ini')

###############
#//
#//  Postfix
#//
###############
postconf -e 'relay_domains = $mydestination'
postconf -e 'smtp_tls_security_level = may'
postconf -e 'smtp_tls_loglevel = 1'
postconf -e 'smtpd_tls_security_level = may'
postconf -e 'smtpd_tls_loglevel = 1'
postconf -e 'mailbox_size_limit = 0'
postconf -e 'message_size_limit = 0'
postconf -e "authorized_submit_users = root,${MYVEMAIL_NGINX_USERGROUP}"

postconf -e 'smtpd_tls_session_cache_database = lmdb:${data_directory}/smtpd_scache'
postconf -e 'smtp_tls_session_cache_database = lmdb:${data_directory}/smtp_scache'

postconf -e 'smtp_tls_note_starttls_offer = yes'
postconf -e 'smtpd_tls_received_header = yes'

postconf -e 'inet_interfaces = all'
postconf -e 'inet_protocols = ipv4'
postconf -e 'smtp_address_preference = ipv4'
postconf -e 'myorigin = $mydomain'
postconf -e 'mydestination = $myhostname, localhost.$mydomain, localhost'

postconf -e "smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt"
postconf -e "smtpd_tls_key_file = /etc/ssl/dovecot/tls.key"
postconf -e "smtpd_tls_cert_file = /etc/ssl/dovecot/tls.pem"

# Enforce TLSv1.2 or TLSv1.2
postconf -e "smtpd_tls_mandatory_protocols = >=TLSv1.2"
postconf -e "smtp_tls_mandatory_protocols = >=TLSv1.2"
postconf -e "smtpd_tls_protocols = >=TLSv1.2"
postconf -e "smtp_tls_protocols = >=TLSv1.2"

# # Logging
# postconf -e "maillog_file = /var/log/postfix.log"

# Virtual mailboxes
postconf -e "mailbox_transport = lmtp:unix:private/dovecot-lmtp"
postconf -e "smtputf8_enable = no"

postconf -e "virtual_mailbox_domains = proxy:mysql:/etc/postfix/sql/virtual_domains_maps.cf"
postconf -e "virtual_mailbox_maps = proxy:mysql:/etc/postfix/sql/virtual_mailbox_maps.cf, proxy:mysql:/etc/postfix/sql/virtual_alias_domain_mailbox_maps.cf"
postconf -e "virtual_alias_maps = proxy:mysql:/etc/postfix/sql/virtual_alias_maps.cf, proxy:mysql:/etc/postfix/sql/virtual_alias_domain_maps.cf, proxy:mysql:/etc/postfix/sql/virtual_alias_domain_catchall_maps.cf"

postconf -e "virtual_transport = lmtp:unix:private/dovecot-lmtp"

postconf -e "virtual_mailbox_base = /var/vmail"
postconf -e "virtual_uid_maps = static:600"
postconf -e "virtual_gid_maps = static:600"
postconf -e "virtual_minimum_uid = 600"
postconf -e "virtual_mailbox_limit = 0"

postconf -e "smtp_header_checks = pcre:/etc/postfix/smtp_header_checks"

# SPF and DKIM checks
postconf -e "policyd-spf_time_limit = 3600"
postconf -e "smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_client_access pcre:/etc/postfix/whitelisted_domains, check_sender_access lmdb:/etc/postfix/whitelisted_emails, check_client_access pcre:/etc/postfix/blacklisted_domains, check_sender_access lmdb:/etc/postfix/blacklisted_emails, check_policy_service unix:private/policyd-spf"

# Milter configuration
postconf -e "milter_default_action = accept"
postconf -e "milter_protocol = 6"
postconf -e "smtpd_milters = local:opendkim/opendkim.sock, local:opendmarc/opendmarc.sock"
postconf -e 'non_smtpd_milters = $smtpd_milters'

# Blocking spam
postconf -e "smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_sender_domain, reject_unknown_reverse_client_hostname, reject_unknown_client_hostname"
postconf -e "smtpd_helo_required = yes"
postconf -e "smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, check_helo_access pcre:/etc/postfix/helo_access, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname"

# Postscreen spambots
postconf -e "postscreen_access_list = permit_mynetworks cidr:/etc/postfix/postscreen_access.cidr cidr:/etc/postfix/postscreen_spf_whitelist.cidr"
postconf -e "postscreen_blacklist_action = drop"

postconf -e "postscreen_greet_action = enforce"

postconf -e "postscreen_dnsbl_threshold = 3"
postconf -e "postscreen_dnsbl_action = enforce"
postconf -e "postscreen_dnsbl_sites = bl.spameatingmonkey.net*2, bl.spamcop.net, dnsbl.sorbs.net" # zen.spamhaus.org*3,

postconf -e "postscreen_dnsbl_whitelist_threshold = -2"

postconf -e "header_checks = pcre:/etc/postfix/header_checks"
postconf -e "body_checks = pcre:/etc/postfix/body_checks"

# master.cf
sed -e 's/^smtp .*smtpd$/# &/' \
    -e '/#smtp\|#smtpd\|#dnsblog\|#tlsproxy/ s/^#//' -i /etc/postfix/master.cf
tee -a /etc/postfix/master.cf >/dev/null <<- master.cf

# Enable submission
submission inet n       -       y       -       -       smtpd
  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=encrypt
  -o smtpd_tls_wrappermode=no
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
  -o smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject
  -o smtpd_sasl_type=dovecot
  -o smtpd_sasl_path=private/auth

# SPF Policy
policyd-spf  unix  -       n       n       -       -       spawn
    user=nobody argv=/usr/bin/perl ${MYVEMAIL_POLICYD}
master.cf

# Deleting Email Headers For Outgoing Emails
echo -e '/^X-Spam-Status:/               IGNORE
/^X-Spam-Checker-Version:/      IGNORE
/^Received:.*/                  IGNORE
/^User-Agent:.*/                IGNORE' | tee /etc/postfix/smtp_header_checks >/dev/null

# Header checks
echo "/free mortgage quote/    DISCARD
/repair your credit/     DISCARD
/lose weight/     DISCARD
/To:.*<>/           DISCARD
/From:.*<>/         DISCARD" | tee -a /etc/postfix/header_checks >/dev/null

# Body checks
echo "/free mortgage quote/    DISCARD
/repair your credit/     DISCARD
/lose weight/            DISCARD" | tee -a /etc/postfix/body_checks >/dev/null

# Touch aliases db
newaliases

###############
#//
#//  Dovecot
#//
###############
rm -r /etc/dovecot/ /etc/ssl/dovecot/
mkdir -p /etc/dovecot/ /etc/ssl/dovecot/

# dovecot.conf
cat >/etc/dovecot/dovecot.conf <<- dovecot.conf
dovecot_config_version = 2.4.1
dovecot_storage_version = 2.4.1

sql_driver = mysql
mysql /run/mysqld/mysqld.sock {
    user = {{MYVEMAIL_POSTFIXADMIN_DBUSER}}
    password = {{MYVEMAIL_POSTFIXADMIN_DBPASS}}
    dbname = {{MYVEMAIL_POSTFIXADMIN_DBNAME}}
}
passdb sql {
    query = SELECT username AS user, \\
      password FROM mailbox WHERE username = '%{user}' AND active='1'
    default_password_scheme = ARGON2I
}
userdb sql {
    fields {
      home = /var/vmail/%{user|domain}/%{user|username}
    }
    query = SELECT '~/Maildir' AS mail_path, \\
      600 AS uid, \\
      600 AS gid \\
      FROM mailbox WHERE username = '%{user}' AND active='1'
    iterate_query = SELECT username AS user FROM mailbox
}

auth_username_format = %{user|lower}
auth_mechanisms = plain login
auth_default_domain = {{MYVEMAIL_DOMAIN}}
auth_debug = yes
auth_debug_passwords = yes

# mbox_write_locks = fcntl
mail_privileged_group = mail
mail_home = /var/vmail/%{user|domain}/%{user|username}
mail_driver = maildir
mail_path = ~/Maildir

service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
     mode = 0600
     user = postfix
     group = postfix
  }
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    mode = 0660
    user = postfix
    group = postfix
  }
}
service stats {
    unix_listener stats-reader {
    user = ${MYVEMAIL_NGINX_USERGROUP}
    group = ${MYVEMAIL_NGINX_USERGROUP}
    mode = 0660
}
unix_listener stats-writer {
    user = ${MYVEMAIL_NGINX_USERGROUP}
    group = ${MYVEMAIL_NGINX_USERGROUP}
    mode = 0660
  }
}

ssl = required
ssl_min_protocol = TLSv1.2
ssl_server_prefer_ciphers = server

namespace inbox {
  inbox = yes
  mailbox Archive {
    auto = subscribe
    special_use = \Archive
  }
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Junk {
    auto = subscribe
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
}

protocols = imap lmtp

!include_try ssl-keys.conf
dovecot.conf

# 10-ssl.conf
install -m 0600 /dev/stdin /etc/dovecot/ssl-keys.conf <<- ssl-keys.conf
ssl_server {
    dh_file   = /etc/ssl/dovecot/dh.pem
    cert_file = /etc/ssl/dovecot/tls.pem
    key_file  = /etc/ssl/dovecot/tls.key
}
ssl-keys.conf

# Virtual mailboxes
install -m 0640 /dev/stdin /etc/postfix/sql/virtual_domains_maps.cf <<- eof
hosts = localhost
dbname = {{MYVEMAIL_POSTFIXADMIN_DBNAME}}
user = {{MYVEMAIL_POSTFIXADMIN_DBUSER}}
password = {{MYVEMAIL_POSTFIXADMIN_DBPASS}}
query = SELECT domain FROM domain WHERE domain='%s' AND active = '1'
#query = SELECT domain FROM domain WHERE domain='%s'
#optional query to use when relaying for backup MX
#query = SELECT domain FROM domain WHERE domain='%s' AND backupmx = '0' AND active = '1'
#expansion_limit = 100
eof

install -m 0640 /dev/stdin /etc/postfix/sql/virtual_mailbox_maps.cf <<- eof
hosts = localhost
dbname = {{MYVEMAIL_POSTFIXADMIN_DBNAME}}
user = {{MYVEMAIL_POSTFIXADMIN_DBUSER}}
password = {{MYVEMAIL_POSTFIXADMIN_DBPASS}}
query = SELECT maildir FROM mailbox WHERE username='%s' AND active = '1'
#expansion_limit = 100
eof

install -m 0640 /dev/stdin /etc/postfix/sql/virtual_alias_domain_mailbox_maps.cf <<- eof
hosts = localhost
dbname = {{MYVEMAIL_POSTFIXADMIN_DBNAME}}
user = {{MYVEMAIL_POSTFIXADMIN_DBUSER}}
password = {{MYVEMAIL_POSTFIXADMIN_DBPASS}}
query = SELECT maildir FROM mailbox,alias_domain WHERE alias_domain.alias_domain = '%d' and mailbox.username = CONCAT('%u', '@', alias_domain.target_domain) AND mailbox.active = 1 AND alias_domain.active='1'
eof

install -m 0640 /dev/stdin /etc/postfix/sql/virtual_alias_maps.cf <<- eof
hosts = localhost
dbname = {{MYVEMAIL_POSTFIXADMIN_DBNAME}}
user = {{MYVEMAIL_POSTFIXADMIN_DBUSER}}
password = {{MYVEMAIL_POSTFIXADMIN_DBPASS}}
query = SELECT goto FROM alias WHERE address='%s' AND active = '1'
#expansion_limit = 100
eof

install -m 0640 /dev/stdin /etc/postfix/sql/virtual_alias_domain_maps.cf <<- eof
hosts = localhost
dbname = {{MYVEMAIL_POSTFIXADMIN_DBNAME}}
user = {{MYVEMAIL_POSTFIXADMIN_DBUSER}}
password = {{MYVEMAIL_POSTFIXADMIN_DBPASS}}
query = SELECT goto FROM alias,alias_domain WHERE alias_domain.alias_domain = '%d' and alias.address = CONCAT('%u', '@', alias_domain.target_domain) AND alias.active = 1 AND alias_domain.active='1'
eof

install -m 0640 /dev/stdin /etc/postfix/sql/virtual_alias_domain_catchall_maps.cf <<- eof
# handles catch-all settings of target-domain
hosts = localhost
dbname = {{MYVEMAIL_POSTFIXADMIN_DBNAME}}
user = {{MYVEMAIL_POSTFIXADMIN_DBUSER}}
password = {{MYVEMAIL_POSTFIXADMIN_DBPASS}}
query = SELECT goto FROM alias,alias_domain WHERE alias_domain.alias_domain = '%d' and alias.address = CONCAT('@', alias_domain.target_domain) AND alias.active = 1 AND alias_domain.active='1'
eof

###############
#//
#//  OpenDKIM
#//
###############
# sed -i 's\^SOCKET=local:$RUNDIR/opendkim.sock\SOCKET="local:/var/spool/postfix/opendkim/opendkim.sock"\' /etc/default/opendkim
sed -i "/Canonicalization\|Mode\|SubDomains\|Socket\|SoftwareHeader\|UserID\|UMask/d" ${MYVEMAIL_OPENDKIM_CONF}
tee -a ${MYVEMAIL_OPENDKIM_CONF} >/dev/null <<- 'opendkim.conf'

Canonicalization    relaxed/simple
Mode                sv
SubDomains          no
Socket              local:/var/spool/postfix/opendkim/opendkim.sock
SoftwareHeader      yes

UserID              opendkim
UMask               007

# Map domains in "from" addresses to keys used to sign messages
KeyTable           refile:/etc/opendkim/KeyTable
SigningTable       refile:/etc/opendkim/SigningTable

# Hosts to ignore when verifying signatures
ExternalIgnoreList  /etc/opendkim/trusted.hosts

# A set of internal hosts whose mail should be signed
InternalHosts       /etc/opendkim/trusted.hosts
opendkim.conf

# trusted.hosts
cat >/etc/opendkim/trusted.hosts <<- trusted.hosts
127.0.0.1
localhost

trusted.hosts

###############
#//
#//  OpenDMARC
#//
###############
sed '/TrustedAuthservIDs\|AuthservID\|RejectFailures\|IgnoreAuthenticatedClients\|RequiredHeaders\|SPFSelfValidate\|Socket\|IgnoreHosts\|UMask\|UserID/d' \
    -i ${MYVEMAIL_OPENDMARC_CONF}

tee -a ${MYVEMAIL_OPENDMARC_CONF} >/dev/null <<- 'opendmarc.conf'

TrustedAuthservIDs {{HOSTNAME}}
AuthservID OpenDMARC
RejectFailures true
IgnoreAuthenticatedClients true
RequiredHeaders true
SPFSelfValidate true

Socket local:/var/spool/postfix/opendmarc/opendmarc.sock
IgnoreHosts  /etc/opendmarc/ignore.hosts

UserID opendmarc
UMask 0002
opendmarc.conf

echo '127.0.0.1' | tee -a /etc/opendmarc/ignore.hosts >/dev/null

###############
#//
#//  Nginx
#//
###############
# php-fpm sock
cat >$(find /etc/php* -type d \( -name "pool.d" -o -name "php-fpm.d" \))/zz-listen.conf <<- php-fpm.sock
listen = 127.0.0.1:9000
user = ${MYVEMAIL_NGINX_USERGROUP}
group = ${MYVEMAIL_NGINX_USERGROUP}
listen.owner = ${MYVEMAIL_NGINX_USERGROUP}
listen.group = ${MYVEMAIL_NGINX_USERGROUP}
listen.mode = 0660
php-fpm.sock

# proxy_params
tee /etc/nginx/proxy_params >/dev/null <<'PROXY'
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
PROXY

# Roundcube/Postfixadmin virtual proxy
tee $(find /etc/nginx -type f -name "default*") >/dev/null <<- 'nginx'
upstream php-handler {
    server 127.0.0.1:9000;
}

server {
    listen {{MYVEMAIL_PORT}} default_server;
    server_name _;

    index index.php index.html;

    error_log  /var/log/nginx/roundcube_error.log;
    access_log /var/log/nginx/roundcube_access.log;

    root /usr/share/webapps/roundcube;

    # Add trailing slash to URI
    location /admin {
        return 302 $scheme://$host/admin/;
    }

    # Postfixadmin
    location ^~ /admin/ {
        proxy_pass http://127.0.0.1:12000/;
        include proxy_params;
    }

    # Roundcube
    location ~ \.php$ {
        client_max_body_size 0;

        try_files $uri =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass php-handler;
        fastcgi_index index.php;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param PATH_INFO $fastcgi_path_info;
    }
}

server {
    listen 12000;
    root /usr/share/webapps/postfixadmin/public/;
    index index.php index.html;

    error_log  /var/log/nginx/postfixadmin_error.log;
    access_log /var/log/nginx/postfixadmin_access.log;

    location / {
        try_files $uri $uri/ /index.php;
    }

    location ~ ^/(.+\.php)$ {
        try_files $uri =404;
        fastcgi_pass php-handler;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include /etc/nginx/fastcgi_params;
    }
}
nginx

###############
#//
#//  Postwhite
#//
###############
cd /usr/local/bin
git clone --quiet https://github.com/spf-tools/spf-tools.git
git clone --quiet https://github.com/stevejenkins/postwhite.git
cp /usr/local/bin/postwhite/postwhite.conf /etc

###############
#//
#//  Syslog
#//
###############
mkdir -p /var/log/mail/
cat >/etc/syslog.conf <<- syslog
mail.info				/var/log/mail/maillog
mail.*					/var/log/mail/maillog.debug
syslog