Support of different default pass schemes + support of BLF-CRYPT (#3832)

* Introduce MAILCOW_PASS_SCHEME in order to support blowfish (cf. mailcow/mailcow-dockerized#1019)

* Furthermore added dovecot to support new environment varible for MAILCOW_PASS_SCHEME defaulted to SSHA256

* Revert changes regarding gitignore.

* Added fallback to SSHA256 if environment is not proper prepared.

* No fallback within management frontend, as it must match to other components.

* Unified and corrected alignment; implemented support of SSHA512

* Currently, password_hash of PHP is using by default bcrypt (BLF). As this might change later, we must ensure, that BLF is still used after PHP changes its default.

* Switched to BLF-CRYPT by default (even on update)

* Switched to BLF-CRYPT by default (even on update)

* Adding information in config generation / update with link to supported hash algorithm

* Bump sogo version to 1.92

* Fallback to BLF-CRYPT in case password scheme is not proper defined for Mailcow administration.

update.sh

@@ -217,6 +217,7 @@ CONFIG_ARRAY=(
   "REDIS_PORT"
   "DOVECOT_MASTER_USER"
   "DOVECOT_MASTER_PASS"
+  "MAILCOW_PASS_SCHEME"
 )
 
 sed -i --follow-symlinks '$a\' mailcow.conf
@@ -390,6 +391,14 @@ for option in ${CONFIG_ARRAY[@]}; do
       echo '# LEAVE EMPTY IF UNSURE' >> mailcow.conf
       echo "DOVECOT_MASTER_PASS=" >> mailcow.conf
   fi
+  elif [[ ${option} == "MAILCOW_PASS_SCHEME" ]]; then
+    if ! grep -q ${option} mailcow.conf; then
+      echo "Adding new option \"${option}\" to mailcow.conf"
+      echo '# Password hash algorithm' >> mailcow.conf
+      echo '# Only certain password hash algorithm are supported. For a fully list of supported schemes,' >> mailcow.conf
+      echo '# see https://mailcow.github.io/mailcow-dockerized-docs/model-passwd/' >> mailcow.conf
+      echo "MAILCOW_PASS_SCHEME=BLF-CRYPT" >> mailcow.conf
+  fi
   elif ! grep -q ${option} mailcow.conf; then
     echo "Adding new option \"${option}\" to mailcow.conf"
     echo "${option}=n" >> mailcow.conf