Build 02

- included code samples for basic login filtering
- included a command-line database import script

README.txt

@@ -8,11 +8,15 @@ and #6783 and #4451).
 
 Auth Redux is intended to be compatible with all versions of Minetest 0.4.14+.
 
+https://forum.minetest.net/viewtopic.php?f=9&t=20393
+
 Revision History
 ----------------------
 
-Version 2.1b (28-Jun-2018)
+Version 2.1b (30-Jun-2018)
   - initial beta version
+  - included code samples for basic login filtering
+  - included a command-line database import script
 
 Installation
 ----------------------
@@ -20,7 +24,8 @@ Installation
   1) Unzip the archive into the mods directory of your game
   2) Rename the auth_rx-master directory to "auth_rx"
   3) Create an empty file named "auth.dbx" within the respective world directory
-  4) Create an empty file named "greenlistmt" within the respective world directory
+  4) Create an empty file named "greenlist.mt" within the respective world directory
+  5) Execute the provided "convert.awk" script (refer to instructions)
 
 Source Code License
 ----------------------

convert.awk

@@ -0,0 +1,64 @@
+#!/bin/awk -f
+# Database Import Script for Auth Redux (by Leslie Krause)
+#
+# STEP 1: Run this script from within the world directory and redirect output to "auth.db"
+# awk -f auth.txt > auth.db
+# STEP 2: Rename 'auth.txt' to 'auth.bak' or move to a different location for safekeeping
+
+function error( msg ) {
+	print( msg " at line " NR " in " FILENAME "." ) > "/dev/stderr"
+}
+
+BEGIN {
+	FS = ":";
+
+	# set default values for new database fields
+
+	approved_addrs = "";
+	oldlogin = -1;
+	lifetime = 0;
+	total_failures = 0;
+	total_attempts = 0;
+	total_sessions = 0;
+
+	# output the database header
+	# TODO: perhaps add? strftime( "%Y-%m-%d %H:%M:%S" )
+
+	print "auth_rx/2.1 @0"
+}
+
+NF != 4 {
+	error( "Malformed record" )
+	next
+}
+
+{
+	username = $1;
+	password = $2;
+	assigned_privs = $3;
+	newlogin = $4;
+
+	if( !match( username, "^[a-zA-Z0-9_-]+$" ) ) {
+		error( "Invalid username field" )
+		next
+	}
+	if( !match( newlogin, "^[0-9]+$" ) && newlogin != -1 ) {
+		error( "Invalid last_login field" )
+		next
+	}
+
+	# Database File Format
+	# --------------------
+	# username
+	# password
+	# oldlogin
+	# newlogin
+	# lifetime
+	# total_sessions
+	# total_attempts
+	# total_failures
+	# approved_addrs
+	# assigned_privs
+
+	print( username ":" password ":" oldlogin ":" newlogin ":" lifetime ":" total_sessions ":" total_attempts ":" total_failures ":" approved_addrs ":" assigned_privs );
+}

samples.mt

@@ -0,0 +1,78 @@
+#####################################################################
+#
+# disallow new players whenever server is overloaded
+#
+#####################################################################
+
+try "There are too many players online right now."
+
+fail all
+if $is_new eq $true
+if $cur_users gt 20
+continue
+
+#####################################################################
+#
+# only allow administrator access (by username or IP address)
+#
+#####################################################################
+
+pass any
+if $addr eq "172.16.100.1"
+if $addr eq "172.16.100.2"
+if $name eq "admin"
+continue
+
+#####################################################################
+#
+# block a range of IP addresses using wildcards
+#
+#####################################################################
+
+try "This subnet is blocked by the administrator."
+
+fail any
+if $addr is "192.88.99.*"
+if $addr is "203.0.113.*"
+if $addr is "192.168.*.*"
+continue
+
+pass now
+
+#####################################################################
+#
+# only allow access from whitelisted users
+#
+#####################################################################
+
+try "The account '$name' is not permitted to join this server."
+
+pass any
+if $name eq "admin"
+when @whitelist.txt eq $name
+continue
+
+fall now
+
+#####################################################################
+#
+# never allow access from blacklisted users
+#
+#####################################################################
+
+try "The account '$name' is not permitted to join this server."
+fail all
+when @blacklist.txt eq $name
+continue
+
+pass now
+
+#####################################################################
+#
+# notify users that the server is unavailable right now
+#
+#####################################################################
+
+try "The server is temporarily offline for maintenance."
+
+fail now