[git.ipfire.org] IPFire 2.x development tree branch, next, updated. 1dbea98bc14984d847fa932453ff2059c6e47be7

[git.ipfire.org] IPFire 2.x development tree branch, next, updated. 1dbea98bc14984d847fa932453ff2059c6e47be7

[Michael Tremer]

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- Log -----------------------------------------------------------------
commit 1dbea98bc14984d847fa932453ff2059c6e47be7
Author: Michael Tremer <michael.tremer@ipfire.org>
Date:   Mon Jun 1 14:40:25 2026 +0100

    dnsforward.cgi: Only accept IP addresses as targets for forwarding
    
    Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

commit bc5011beb7a43e4f22afc5d9ab3ce3cad3ad51b5
Author: Michael Tremer <michael.tremer@ipfire.org>
Date:   Mon Jun 1 14:38:33 2026 +0100

    knot resolver: Only accept IP addresses for forwarding
    
    Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

-----------------------------------------------------------------------

Summary of changes:
 config/knot-resolver/config.lua | 32 +++++++++++++++++++++++++++++---
 html/cgi-bin/dnsforward.cgi     |  4 ++--
 2 files changed, 31 insertions(+), 5 deletions(-)

Difference in files:
diff --git a/config/knot-resolver/config.lua b/config/knot-resolver/config.lua
index d563ed7f8..46cfac5e9 100644
--- a/config/knot-resolver/config.lua
+++ b/config/knot-resolver/config.lua
@@ -105,6 +105,27 @@ local function netmask_to_prefix(netmask)
 	return prefix
 end
 
+local function check_ipv4_address(address)
+	local a, b, c, d = address:match("^(%d+)%.(%d+)%.(%d+)%.(%d+)$")
+
+	-- Return if we could not parse the address
+	if not a or not b or not c or not d then
+		return false
+	end
+
+	-- Convert the octets into numbers
+	a, b, c, d = tonumber(a), tonumber(b), tonumber(c), tonumber(d)
+
+	-- Check if all octets are in range
+	for _, octet in ipairs({a, b, c, d}) do
+		if octet > 255 then
+			return false
+		end
+	end
+
+	return true
+end
+
 local function reverse_zones(address, netmask)
 	local a, b, c, d = address:match("^(%d+)%.(%d+)%.(%d+)%.(%d+)$")
 
@@ -350,12 +371,14 @@ function config.load_forwarding()
 		local status, name, address, comment, no_dnssec = unpack(fields)
 
 		if status == "on" then
+			local addresses = {}
 			local dnssec = true
 
 			-- Split multiple addresses
-			local addresses = {}
 			for a in address:gmatch("[^|]+") do
-				addresses[#addresses+1] = { a }
+				if check_ipv4_address(a) then
+					table.insert(addresses, { a })
+				end
 			end
 
 			-- Use a stub resolver if we don't want DNSSEC
@@ -364,7 +387,10 @@ function config.load_forwarding()
 			end
 
 			-- Apply the forwarding rule
-			policy.rule_forward_add(name, { dnssec=dnssec, auth=false }, addresses)
+			if #addresses > 0 then
+				policy.rule_forward_add(name,
+					{ dnssec=dnssec, auth=false }, addresses)
+			end
 		end
 	end
 end
diff --git a/html/cgi-bin/dnsforward.cgi b/html/cgi-bin/dnsforward.cgi
index 3b066902b..29576eb27 100644
--- a/html/cgi-bin/dnsforward.cgi
+++ b/html/cgi-bin/dnsforward.cgi
@@ -71,8 +71,8 @@ if ($cgiparams{'ACTION'} eq $Lang::tr{'add'})
 	my @forward_servers = split(/\,/, $cgiparams{'FORWARD_SERVERS'});
 	foreach my $forward_server (@forward_servers) {
 		# Check if the settings for the forward server are valid.
-		unless(&General::validip($forward_server) || &General::validfqdn($forward_server)) {
-			$errormessage = "$Lang::tr{'invalid ip or hostname'}: $forward_server";
+		unless(&General::validip($forward_server)) {
+			$errormessage = "$Lang::tr{'invalid ip address'}: $forward_server";
 			last;
 		}
 	}


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