enum types simplifying sort, config fails on wrong action types

irc/config.go

@@ -101,14 +101,31 @@ type DnsblListEntry struct {
 	Types      []string
 	Reply      map[string]DnsblListReply
 	Action     string
+	ActionType uint
 	Reason     string
 }
 
 type DnsblListReply struct {
 	Action     string
+	ActionType uint
 	Reason     string
 }
 
+func (conf *Config) DnsblTypes(action string) (uint, error) {
+	actions := map[string]uint{
+		"require-sasl": DnsblRequireSaslReply,
+		"allow":        DnsblAllowReply,
+		"block":        DnsblBlockReply,
+		"notify":       DnsblNotifyReply,
+	}
+
+	if value, exists := actions[action]; exists {
+		return value, nil
+	}
+
+	return DnsblUnknownReply, errors.New(fmt.Sprintf("Unknown DNSBL action type: %s", action))
+}
+
 type NickReservationMethod int
 
 const (
@@ -493,12 +510,16 @@ func LoadConfig(filename string) (config *Config, err error) {
 	config.Server.WebIRC = newWebIRC
 
 	for id, list := range config.Dnsbl.Lists {
-		var action, reason = list.Action, list.Reason
+		actionType, err := config.DnsblTypes(list.Action)
+		if err != nil {
+			return nil, err
+		}
+		reason := list.Reason
 
 		var newDnsblListReply = make(map[string]DnsblListReply)
 		for key, reply := range list.Reply {
 			if reply.Action == "" {
-				reply.Action = action
+				reply.ActionType = actionType
 			}
 			if reply.Reason == "" {
 				reply.Reason = reason
@@ -508,6 +529,7 @@ func LoadConfig(filename string) (config *Config, err error) {
 				newDnsblListReply[newKey] = reply
 			}
 		}
+		config.Dnsbl.Lists[id].ActionType = actionType
 		config.Dnsbl.Lists[id].Reply = newDnsblListReply
 	}
 

irc/dnsbl.go

@@ -9,6 +9,16 @@ import (
 	"github.com/oragono/oragono/irc/sno"
 )
 
+// Constants
+const (
+	DnsblRequireSaslReply uint = iota
+	DnsblAllowReply
+	DnsblBlockReply
+	DnsblNotifyReply
+	DnsblUnknownReply
+)
+
+// ReverseAddress returns IPv4 addresses reversed
 func ReverseAddress(ip net.IP) string {
 	// This is a IPv4 address
 	if ip.To4() != nil {
@@ -25,12 +35,7 @@ func ReverseAddress(ip net.IP) string {
 	return ip.String()
 }
 
-func LastIpOctet(addr string) string {
+// LookupBlacklistEntry performs a lookup on the dnsbl on the client IP
-	address := strings.Split(addr, ".")
-
-	return address[len(address)-1]
-}
-
 func (server *Server) LookupBlacklistEntry(list *DnsblListEntry, client *Client) []string {
 	res, err := net.LookupHost(fmt.Sprintf("%s.%s", ReverseAddress(client.IP()), list.Host))
 
@@ -42,23 +47,16 @@ func (server *Server) LookupBlacklistEntry(list *DnsblListEntry, client *Client)
 
 	if len(res) > 0 {
 		for _, addr := range res {
-			entries = append(entries, LastIpOctet(addr))
+			octet := strings.Split(addr, ".")
+			if len(octet) > 0 {
+				entries = append(entries, octet[len(octet)-1])
+			}
 		}
 	}
 
 	return entries
 }
 
-func sendDnsblMessage(client *Client, message string) {
-	/*fmt.Printf(client.server.DnsblConfig().Channel)
-	if channel := client.server.DnsblConfig().Channel; channel != "" {
-		fmt.Printf(channel)
-		client.Send(nil, client.server.name, "PRIVMSG", channel, message)
-	}
-	*/
-	client.server.snomasks.Send(sno.Dnsbl, message)
-}
-
 // ProcessBlacklist does
 func (server *Server) ProcessBlacklist(client *Client) {
 
@@ -67,56 +65,51 @@ func (server *Server) ProcessBlacklist(client *Client) {
 		return
 	}
 
+	channel := server.DnsblConfig().Channel
+	lists := server.DnsblConfig().Lists
+
 	type DnsblTypeResponse struct {
 		Host       string
-		Action string
+		ActionType uint
 		Reason     string
 	}
 	var items = []DnsblTypeResponse{}
-	for _, list := range server.DnsblConfig().Lists {
+	for _, list := range lists {
 		response := DnsblTypeResponse{
 			Host:       list.Host,
-			Action: list.Action,
+			ActionType: list.ActionType,
 			Reason:     list.Reason,
 		}
 		// update action/reason if matched with new ...
 		for _, entry := range server.LookupBlacklistEntry(&list, client) {
 			if reply, exists := list.Reply[entry]; exists {
-				response.Action, response.Reason = reply.Action, reply.Reason
+				response.ActionType, response.Reason = list.ActionType, reply.Reason
 			}
 			items = append(items, response)
 		}
 	}
 
-	// Sort responses so that require-sasl blocks come first. Otherwise A>B (allow>block, allow>notify, block>notify)
+	// Sorts in the following order: require-sasl, allow, block, notify
-	// so that responses come in this order:
-	// - require-sasl
-	// - allow
-	// - block
-	// - notify
 	sort.Slice(items, func(i, j int) bool {
-		if items[i].Action == "require-sasl" {
+		return items[i].ActionType > items[j].ActionType
-			return true
-		}
-		return items[i].Action > items[j].Action
 	})
 
 	if len(items) > 0 {
 		item := items[0]
-		switch item.Action {
+		switch item.ActionType {
-		case "require-sasl":
+		case DnsblRequireSaslReply:
-			sendDnsblMessage(client, fmt.Sprintf("Connecting client %s matched %s, requiring SASL to proceed", client.IP(), item.Host))
+			client.sendServerMessage("", channel, sno.Dnsbl, fmt.Sprintf("Connecting client %s matched %s, requiring SASL to proceed", client.IP(), item.Host))
 			client.SetRequireSasl(true, item.Reason)
 
-		case "block":
+		case DnsblBlockReply:
-			sendDnsblMessage(client, fmt.Sprintf("Connecting client %s matched %s - killing", client.IP(), item.Host))
+			client.sendServerMessage("", channel, sno.Dnsbl, fmt.Sprintf("Connecting client %s matched %s - killing", client.IP(), item.Host))
 			client.Quit(strings.Replace(item.Reason, "{ip}", client.IPString(), -1))
 
-		case "notify":
+		case DnsblNotifyReply:
-			sendDnsblMessage(client, fmt.Sprintf("Connecting client %s matched %s", client.IP(), item.Host))
+			client.sendServerMessage("", channel, sno.Dnsbl, fmt.Sprintf("Connecting client %s matched %s", client.IP(), item.Host))
 
-		case "allow":
+		case DnsblAllowReply:
-			sendDnsblMessage(client, fmt.Sprintf("Allowing host %s [%s]", client.IP(), item.Host))
+			client.sendServerMessage("", channel, sno.Dnsbl, fmt.Sprintf("Allowing host %s [%s]", client.IP(), item.Host))
 		}
 	}
 
@@ -130,13 +123,29 @@ func connectionRequiresSasl(client *Client) bool {
 		return false
 	}
 
+	channel := client.server.DnsblConfig().Channel
+
 	if client.Account() == "" {
-		sendDnsblMessage(client, fmt.Sprintf("Connecting client %s and did not authenticate through SASL - blocking connection", client.IP()))
+		//client.sendServerMessage("", channel, sno.Dnsbl, fmt.Sprintf("Connecting client %s and did not authenticate through SASL - blocking connection", client.IP()))
 		client.Quit(strings.Replace(reason, "{ip}", client.IPString(), -1))
 		return true
 	}
 
-	sendDnsblMessage(client, fmt.Sprintf("Connecting client %s authenticated through SASL - allowing", client.IP()))
+	client.sendServerMessage("", channel, sno.Dnsbl, fmt.Sprintf("Connecting client %s authenticated through SASL - allowing", client.IP()))
 
 	return false
 }
+
+func (client *Client) sendServerMessage(pseudo string, channel string, mask sno.Mask, message string) {
+	/*
+	   This causes an out of bounds error - possibly in client.Send() - investigate further
+	   	if pseudo == "" {
+	   		pseudo = client.server.name
+	   	}
+
+	   	if channel != "" {
+	   		client.Send(nil, pseudo, "PRIVMSG", channel, message)
+	   	}
+	*/
+	client.server.snomasks.Send(mask, message)
+}

irc/handlers.go

@@ -1784,9 +1784,6 @@ func operHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *Resp
 
 	server.snomasks.Send(sno.LocalOpers, fmt.Sprintf(ircfmt.Unescape("Client opered up $c[grey][$r%s$c[grey], $r%s$c[grey]]"), client.nickMaskString, client.operName))
 
-	// increase oper count
-	//server.stats.ChangeOperators(1)
-
 	// client may now be unthrottled by the fakelag system
 	client.resetFakelag()
 

irc/server.go

@@ -446,11 +446,6 @@ func (server *Server) tryRegister(c *Client) {
 		return
 	}
 
-	if connectionRequiresSasl(c) {
-		c.destroy(false)
-		return
-	}
-
 	// client MUST send PASS (or AUTHENTICATE, if skip-server-password is set)
 	// before completing the other registration commands
 	if !c.Authorized() {
@@ -467,6 +462,12 @@ func (server *Server) tryRegister(c *Client) {
 		return
 	}
 
+	// Check if connection requires SASL
+	if connectionRequiresSasl(c) {
+		c.destroy(false)
+		return
+	}
+
 	// check KLINEs
 	isBanned, info := server.klines.CheckMasks(c.AllNickmasks()...)
 	if isBanned {

oragono.yaml

@@ -407,3 +407,62 @@ fakelag:
     # client status resets to the default state if they go this long without
     # sending any commands:
     cooldown: 2s
+# dnsbls are DNS block lists. they're used to automatically deny or restrict clients who
+# have been deemed bad
+dnsbl:
+    # whether to check DNS block lists
+    enabled: false
+
+    # optional channel to send rejections to if the 'notify' action is specified in any lists
+    #channel: "#dnsbl"
+
+    # the specific dnsbls to check for every client entering the network
+    lists:
+        -
+            # host - specific hostname to use
+            host: "dnsbl.dronebl.org"
+
+            # which types of hosts to look up on this dnsbl. we support:
+            # - ipv4: D.C.B.A.hostname
+            # - ipv6: n.i.b.b.l.e.s.hostname (see explanation here: https://www.dan.me.uk/dnsbl )
+            types:
+                - ipv4
+                - ipv6
+
+            # action to take if the client matches this dnsbl:
+            # - allow - let the client access the network
+            # - block - block the client from accessing the network, with the given message
+            # - notify - send a notification to opers in-channel (if configured) and via the 'S' snomask
+            # - require-sasl - require the client to login with SASL, kill them if they don't
+            action: block
+
+            # reason that's shown if they're unable to access the network because of this rbl.
+            # we support the following variables:
+            # - "{ip}" - their IP address
+            reason: "Your IP ({ip}) is listed in DroneBL. For assistance, see http://dronebl.org/lookup?ip={ip}"
+
+            # specific replies to take action on. these are based on the last octet of the return IP.
+            # for example, "24" or "13,54,24" would both match a result of "127.0.0.24" from the rbl.
+            reply:
+                # 8/9/10/11 are all proxies
+                "8,9,10,11":
+                    action: require-sasl
+                    reason: "You need to enable SASL to access this network. For assistance, see http://dronebl.org/lookup?ip={ip}"
+                # 98 is an example reply type that's not real
+                98:
+                    action: allow
+
+        -
+            host: "rbl.efnetrbl.org"
+            types:
+                - ipv4
+            action: block
+            reason: "Your IP ({ip}) is listed in the EFnet RBL. For assistance, see http://efnetrbl.org/?i={ip}"
+
+        -
+            host: "torexit.dan.me.uk"
+            types:
+                - ipv4
+                - ipv6
+            action: require-sasl
+            reason: "You need to enable SASL to access this network while using TOR"