#!/bin/sh

set -e

[ "$1" = "configure" ] || exit 0
[ "$DEBIAN_SCRIPT_DEBUG" ] && set -vx

# Load CARNet Tools
. /usr/share/carnet-tools/functions.sh


move_certs() {
        if [ -f /etc/dovecot/private/dovecot.pem -a ! -f /etc/dovecot/private/dovecot.key ]; then
                mv -f /etc/dovecot/private/dovecot.pem /etc/dovecot/private/dovecot.key || true
        fi

        if [ -f /etc/dovecot/dovecot.pem ]; then
                mv -f /etc/dovecot/dovecot.pem /etc/dovecot/private/dovecot.pem || true
        fi
}

put_new_certs() {
# postavlja cert i key na nove putanje iz bustera
  cp_check_and_sed '#ssl_key = </etc/dovecot/private/dovecot.pem' \
                   's|#ssl_key = </etc/dovecot/private/dovecot.pem|ssl_key = </etc/dovecot/private/dovecot.key|g' \
                   /etc/dovecot/conf.d/10-ssl.conf || true
  cp_check_and_sed '#ssl_cert = </etc/dovecot/dovecot.pem' \
                   's|#ssl_cert = </etc/dovecot/dovecot.pem|ssl_cert = </etc/dovecot/private/dovecot.pem|g' \
                   /etc/dovecot/conf.d/10-ssl.conf || true
  cp_check_and_sed 'ssl_cert = </etc/dovecot/dovecot.pem' \
                   's|ssl_cert = </etc/dovecot/dovecot.pem|ssl_cert = </etc/dovecot/private/dovecot.pem|g' \
                   /etc/dovecot/conf.d/10-ssl.conf || true
  cp_check_and_sed 'ssl_key = </etc/dovecot/private/dovecot.pem' \
                   's|ssl_key = </etc/dovecot/private/dovecot.pem|ssl_key = </etc/dovecot/private/dovecot.key|g' \
                   /etc/dovecot/conf.d/10-ssl.conf || true
  cp_check_and_sed '#ssl_cert = </etc/dovecot/private/dovecot.pem' \
                   's|#ssl_cert = </etc/dovecot/private/dovecot.pem|ssl_cert = </etc/dovecot/private/dovecot.pem|g' \
                   /etc/dovecot/conf.d/10-ssl.conf || true
  cp_check_and_sed '#ssl_key = </etc/dovecot/private/dovecot.key' \
                   's|#ssl_key = </etc/dovecot/private/dovecot.key|ssl_key = </etc/dovecot/private/dovecot.key|g' \
                   /etc/dovecot/conf.d/10-ssl.conf || true
}


cp_check_and_sed '#disable_plaintext_auth' \
                 's/#disable_plaintext_auth/disable_plaintext_auth/g' \
		 /etc/dovecot/conf.d/10-auth.conf || true

cp_check_and_sed 'disable_plaintext_auth.*yes' \
                 's/disable_plaintext_auth.*$/disable_plaintext_auth = no/g' \
		 /etc/dovecot/conf.d/10-auth.conf || true

if ! grep -q "mail_privileged_group.*mail$" /etc/dovecot/conf.d/10-mail.conf; then
	cp_check_and_sed 'mail_privileged_group' \
	                 's/mail_privileged_group.*$/mail_privileged_group = mail/g' \
			 /etc/dovecot/conf.d/10-mail.conf || true
fi

cp_check_and_sed '#imap_client_workarounds' \
                 's/#imap_client_workarounds/imap_client_workarounds/g' \
		 /etc/dovecot/conf.d/20-imap.conf || true

cp_check_and_sed '#pop3_client_workarounds' \
                 's/#pop3_client_workarounds/pop3_client_workarounds/g' \
		 /etc/dovecot/conf.d/20-pop3.conf || true

cp_check_and_sed 'imap_client_workarounds' \
                 's/imap_client_workarounds.*$/imap_client_workarounds = delay-newmail tb-extra-mailbox-sep tb-lsub-flags/g' \
		 /etc/dovecot/conf.d/20-imap.conf || true

cp_check_and_sed 'pop3_client_workarounds' \
                 's/pop3_client_workarounds.*$/pop3_client_workarounds = outlook-no-nuls oe-ns-eoh/g' \
		 /etc/dovecot/conf.d/20-pop3.conf || true

cp_check_and_sed '#ssl_cipher_list' \
                 's/#ssl_cipher_list.*/ssl_cipher_list = ALL:!aNULL:!eNULL:!ADH!LOW:!MEDIUM:!EXP:HIGH/g' \
		 /etc/dovecot/conf.d/10-ssl.conf || true

# izbacujemo SSLv2
cp_check_and_sed 'ssl_cipher_list' \
                 's/:\!SSLv2//g' \
		 /etc/dovecot/conf.d/10-ssl.conf || true

# trazio zelja
cp_check_and_sed '#ssl =' \
		 's/^#ssl =/ssl =/g' \
		 /etc/dovecot/conf.d/10-ssl.conf || true

# trazio zelja
cp_check_and_sed 'ssl = no' \
		 's/^ssl = no/ssl = yes/g' \
		 /etc/dovecot/conf.d/10-ssl.conf || true


dovecert="$(doveconf ssl_cert)"
dovekey="$(doveconf ssl_key)"

if [ -n "$dovecert" -a -n "$dovekey" ]; then
        echo -n "CN: Opcije ssl_cert i ssl_key su pronađene"

        cfile=$(grep -l ^ssl_cert /etc/dovecot/conf.d/*.conf | tail -1)
        kfile=$(grep -l ^ssl_key /etc/dovecot/conf.d/*.conf | tail -1)

        if grep -q ^ssl_cert $cfile && grep -q ^ssl_key $kfile; then
                if [ "$cfile" != "/etc/dovecot/conf.d/10-ssl.conf" -o "$kfile" != "/etc/dovecot/conf.d/10-ssl.conf" ]; then
                        echo " izvan 10-ssl.conf (u $cfile), preskačem rekonfiguraciju..."
                else
                        echo " u /etc/dovecot/conf.d/10-ssl.conf. Postavljam default vrijednosti iz Debiana 10..."
                        put_new_certs
                        move_certs
                fi
        fi
else
        echo "CN: ssl_cert i ssl_key nisu definirani, postavljam default vrijednosti iz Debiana 10!"
        # ako postoji,  pomaknut ćemo stari certifikat na novo mjesto i preimenovati kljuc
        # ako ne postoje certifikati generiraj ih i postavi na prava mjesta

        move_certs

        if [ ! -f /etc/dovecot/private/dovecot.pem -a ! -f /etc/dovecot/private/dovecot.key ]; then
            echo "CN: Pravim certifikat i kljuc i postavljam ih u /etc/dovecot/private..."
            /usr/share/dovecot-cn/mkcert.sh || true
        fi  
        put_new_certs
fi



### buster ima ssl_min_protocol umjesto ssl_protocols
# ne radimo ništa ako već postoji ^ssl_min_protocol = TLS*, možda je sistemac smanjivao level TLS-a

if ! grep -q "^ssl_min_protocol = TLS" /etc/dovecot/conf.d/10-ssl.conf; then
	# postavlja minimalni TLS protokol i mijenja ime varijable
	cp_check_and_sed '#ssl_protocols =' \
			 's/^#ssl_protocols.*/ssl_min_protocol = TLSv1.2/g' \
			 /etc/dovecot/conf.d/10-ssl.conf || true

	# postavlja minimalni TLS protokol ako je varijabla već uključena
	cp_check_and_sed 'ssl_protocols =' \
			 's/^ssl_protocols.*/ssl_min_protocol = TLSv1.2/g' \
			 /etc/dovecot/conf.d/10-ssl.conf || true

	# samo popravlja inačicu protokola i uključuje varijablu
	cp_check_and_sed '#ssl_min_protocol =' \
			 's/^#ssl_min_protocol.*/ssl_min_protocol = TLSv1.2/g' \
			 /etc/dovecot/conf.d/10-ssl.conf || true

	# popravlja inačicu protokola ako je varijabla već uključena (ako je zaostao SSLv2 i SSLv3)
	cp_check_and_sed 'ssl_min_protocol =' \
			 's/^ssl_min_protocol.*/ssl_min_protocol = TLSv1.2/g' \
			 /etc/dovecot/conf.d/10-ssl.conf || true
fi

### buster ima DH ključ koji se nalazi u paketu dovecot-core
# ne radimo ništa ako već postoji ^ssl_dh koji nije prazan

if ! grep -q "^ssl_dh = /" /etc/dovecot/conf.d/10-ssl.conf; then
	# postavlja DH i uključuje varijablu
	cp_check_and_sed '#ssl_dh =' \
			 's,^#ssl_dh.*,ssl_dh = </usr/share/dovecot/dh.pem,g' \
			 /etc/dovecot/conf.d/10-ssl.conf || true
fi

# maknuti kludge kreiran u carnet-upgrade
test -f /etc/dovecot/conf.d/95-cn6-upgrade.conf && mv /etc/dovecot/conf.d/95-cn6-upgrade.conf /var/backups || true
test -f /etc/dovecot/conf.d/95-cn7-upgrade.conf && mv /etc/dovecot/conf.d/95-cn7-upgrade.conf /var/backups || true
test -f /etc/dovecot/conf.d/95-cn8-upgrade.conf && mv /etc/dovecot/conf.d/95-cn8-upgrade.conf /var/backups || true
test -f /etc/dovecot/conf.d/95-cn9-upgrade.conf && mv /etc/dovecot/conf.d/95-cn9-upgrade.conf /var/backups || true
# nije više potrebno editirati dovecot.conf koji je samo hrpa includea
test -f /etc/dovecot/dovecot.conf.cn6-upgrade && mv /etc/dovecot/dovecot.conf.cn6-upgrade /var/backups || true
test -f /etc/dovecot/dovecot.conf.cn7-upgrade && mv /etc/dovecot/dovecot.conf.cn7-upgrade /var/backups || true
test -f /etc/dovecot/dovecot.conf.cn8-upgrade && mv /etc/dovecot/dovecot.conf.cn8-upgrade /var/backups || true
test -f /etc/dovecot/dovecot.conf.cn9-upgrade && mv /etc/dovecot/dovecot.conf.cn9-upgrade /var/backups || true

# staro, može se brisati
# dodao ico, gasi SSLv3 protokol
#cp_check_and_sed '#ssl_protocols =' \
#		 's/^#ssl_protocols.*/ssl_protocols = !SSLv3/g' \
#		 /etc/dovecot/conf.d/10-ssl.conf || true

# dodao zelja, gasi stare SSL protokole
#cp_check_and_sed 'ssl_protocols =' \
#		 's/\!SSLv2 //g' \
#		 /etc/dovecot/conf.d/10-ssl.conf || true

# dodao zelja, gasi stare SSL protokole/ciphere u 95-cn9-upgrade.conf ako postoje
#if [ -f /etc/dovecot/conf.d/95-cn9-upgrade.conf ]; then
#	cp_check_and_sed 'ssl_protocols =' \
#			 's/\!SSLv2 //g' \
#			 /etc/dovecot/conf.d/95-cn9-upgrade.conf || true
#	cp_check_and_sed 'ssl_cipher_list' \
#        	         's/:\!SSLv2//g' \
#			 /etc/dovecot/conf.d/95-cn9-upgrade.conf || true
#fi

# restart 
service dovecot restart || true

#DEBHELPER#

exit 0