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@@ -3,6 +3,7 @@ package logic
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import (
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"encoding/json"
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"errors"
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+ "fmt"
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"strings"
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"time"
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@@ -20,6 +21,9 @@ func CreateEgressGateway(gateway models.EgressGatewayRequest) (models.Node, erro
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if node.OS != "linux" && node.OS != "freebsd" { // add in darwin later
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return models.Node{}, errors.New(node.OS + " is unsupported for egress gateways")
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}
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+ if node.OS == "linux" && node.FirewallInUse == models.FIREWALL_NONE {
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+ return models.Node{}, errors.New("firewall is not supported for egress gateways")
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+ }
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if gateway.NatEnabled == "" {
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gateway.NatEnabled = "yes"
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}
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@@ -30,20 +34,29 @@ func CreateEgressGateway(gateway models.EgressGatewayRequest) (models.Node, erro
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node.IsEgressGateway = "yes"
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node.EgressGatewayRanges = gateway.Ranges
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node.EgressGatewayNatEnabled = gateway.NatEnabled
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+ node.EgressGatewayRequest = gateway // store entire request for use when preserving the egress gateway
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postUpCmd := ""
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postDownCmd := ""
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+ logger.Log(3, "creating egress gateway firewall in use is '", node.FirewallInUse, "'")
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if node.OS == "linux" {
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- postUpCmd = "iptables -A FORWARD -i " + node.Interface + " -j ACCEPT; "
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- postUpCmd += "iptables -A FORWARD -o " + node.Interface + " -j ACCEPT"
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- postDownCmd = "iptables -D FORWARD -i " + node.Interface + " -j ACCEPT; "
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- postDownCmd += "iptables -D FORWARD -o " + node.Interface + " -j ACCEPT"
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-
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- if node.EgressGatewayNatEnabled == "yes" {
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- postUpCmd += "; iptables -t nat -A POSTROUTING -o " + gateway.Interface + " -j MASQUERADE"
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- postDownCmd += "; iptables -t nat -D POSTROUTING -o " + gateway.Interface + " -j MASQUERADE"
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+ switch node.FirewallInUse {
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+ case models.FIREWALL_NFTABLES:
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+ // nftables only supported on Linux
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+ // assumes chains eg FORWARD and POSTROUTING already exist
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+ logger.Log(3, "creating egress gateway nftables is present")
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+ // down commands don't remove as removal of the rules leaves an empty chain while
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+ // removing the chain with rules in it would remove all rules in that section (not safe
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+ // if there are remaining rules on the host that need to stay). In practice the chain is removed
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+ // when non-empty even though the removal of a non-empty chain should not be possible per nftables wiki.
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+ postUpCmd, postDownCmd = firewallNFTCommandsCreateEgress(node.Interface, gateway.Interface, gateway.Ranges, node.EgressGatewayNatEnabled)
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+
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+ default: // iptables assumed
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+ logger.Log(3, "creating egress gateway nftables is not present")
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+ postUpCmd, postDownCmd = firewallIPTablesCommandsCreateEgress(node.Interface, gateway.Interface, node.EgressGatewayNatEnabled)
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}
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}
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if node.OS == "freebsd" {
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+ // spacing around ; is important for later parsing of postup/postdown in wireguard/common.go
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postUpCmd = "kldload ipfw ipfw_nat ; "
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postUpCmd += "ipfw disable one_pass ; "
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postUpCmd += "ipfw nat 1 config if " + gateway.Interface + " same_ports unreg_only reset ; "
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@@ -65,12 +78,12 @@ func CreateEgressGateway(gateway models.EgressGatewayRequest) (models.Node, erro
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}
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if node.PostUp != "" {
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if !strings.Contains(node.PostUp, postUpCmd) {
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- postUpCmd = node.PostUp + "; " + postUpCmd
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+ postUpCmd = node.PostUp + " ; " + postUpCmd
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}
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}
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if node.PostDown != "" {
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if !strings.Contains(node.PostDown, postDownCmd) {
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- postDownCmd = node.PostDown + "; " + postDownCmd
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+ postDownCmd = node.PostDown + " ; " + postDownCmd
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}
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}
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@@ -84,9 +97,6 @@ func CreateEgressGateway(gateway models.EgressGatewayRequest) (models.Node, erro
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if err = database.Insert(node.ID, string(nodeData), database.NODES_TABLE_NAME); err != nil {
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return models.Node{}, err
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}
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- if err = NetworkNodesUpdatePullChanges(node.Network); err != nil {
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- return models.Node{}, err
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- }
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return node, nil
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}
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@@ -115,23 +125,27 @@ func DeleteEgressGateway(network, nodeid string) (models.Node, error) {
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node.IsEgressGateway = "no"
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node.EgressGatewayRanges = []string{}
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+ node.EgressGatewayRequest = models.EgressGatewayRequest{} // remove preserved request as the egress gateway is gone
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+ // needed in case we don't preserve a gateway (i.e., no ingress to preserve)
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node.PostUp = ""
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node.PostDown = ""
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+
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+ logger.Log(3, "deleting egress gateway firewall in use is '", node.FirewallInUse, "'")
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if node.IsIngressGateway == "yes" { // check if node is still an ingress gateway before completely deleting postdown/up rules
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+ // still have an ingress gateway so preserve it
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if node.OS == "linux" {
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- node.PostUp = "iptables -A FORWARD -i " + node.Interface + " -j ACCEPT ; "
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- node.PostUp += "iptables -A FORWARD -o " + node.Interface + " -j ACCEPT ; "
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- node.PostUp += "iptables -t nat -A POSTROUTING -o " + node.Interface + " -j MASQUERADE"
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- node.PostDown = "iptables -D FORWARD -i " + node.Interface + " -j ACCEPT ; "
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- node.PostDown += "iptables -D FORWARD -o " + node.Interface + " -j ACCEPT ; "
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- node.PostDown += "iptables -t nat -D POSTROUTING -o " + node.Interface + " -j MASQUERADE"
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- }
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- if node.OS == "freebsd" {
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- node.PostUp = ""
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- node.PostDown = "ipfw delete 64000 ; "
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- node.PostDown += "ipfw delete 65534 ; "
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- node.PostDown += "kldunload ipfw_nat ipfw"
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+ switch node.FirewallInUse {
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+ case models.FIREWALL_NFTABLES:
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+ // nftables only supported on Linux
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+ // assumes chains eg FORWARD and POSTROUTING already exist
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+ logger.Log(3, "deleting egress gateway nftables is present")
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+ node.PostUp, node.PostDown = firewallNFTCommandsCreateIngress(node.Interface)
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+ default:
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+ logger.Log(3, "deleting egress gateway nftables is not present")
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+ node.PostUp, node.PostDown = firewallIPTablesCommandsCreateIngress(node.Interface)
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+ }
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}
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+ // no need to preserve ingress gateway on FreeBSD as ingress is not supported on that OS
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}
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node.SetLastModified()
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@@ -142,19 +156,20 @@ func DeleteEgressGateway(network, nodeid string) (models.Node, error) {
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if err = database.Insert(node.ID, string(data), database.NODES_TABLE_NAME); err != nil {
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return models.Node{}, err
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}
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- if err = NetworkNodesUpdatePullChanges(network); err != nil {
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- return models.Node{}, err
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- }
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return node, nil
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}
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// CreateIngressGateway - creates an ingress gateway
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func CreateIngressGateway(netid string, nodeid string) (models.Node, error) {
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+ var postUpCmd, postDownCmd string
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node, err := GetNodeByID(nodeid)
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if node.OS != "linux" { // add in darwin later
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return models.Node{}, errors.New(node.OS + " is unsupported for ingress gateways")
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}
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+ if node.OS == "linux" && node.FirewallInUse == models.FIREWALL_NONE {
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+ return models.Node{}, errors.New("firewall is not supported for ingress gateways")
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+ }
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if err != nil {
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return models.Node{}, err
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@@ -166,20 +181,26 @@ func CreateIngressGateway(netid string, nodeid string) (models.Node, error) {
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}
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node.IsIngressGateway = "yes"
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node.IngressGatewayRange = network.AddressRange
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- postUpCmd := "iptables -A FORWARD -i " + node.Interface + " -j ACCEPT ; "
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- postUpCmd += "iptables -A FORWARD -o " + node.Interface + " -j ACCEPT ; "
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- postUpCmd += "iptables -t nat -A POSTROUTING -o " + node.Interface + " -j MASQUERADE"
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- postDownCmd := "iptables -D FORWARD -i " + node.Interface + " -j ACCEPT ; "
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- postDownCmd += "iptables -D FORWARD -o " + node.Interface + " -j ACCEPT ; "
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- postDownCmd += "iptables -t nat -D POSTROUTING -o " + node.Interface + " -j MASQUERADE"
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+ logger.Log(3, "creating ingress gateway firewall in use is '", node.FirewallInUse, "'")
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+ switch node.FirewallInUse {
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+ case models.FIREWALL_NFTABLES:
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+ // nftables only supported on Linux
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+ // assumes chains eg FORWARD and POSTROUTING already exist
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+ logger.Log(3, "creating ingress gateway nftables is present")
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+ postUpCmd, postDownCmd = firewallNFTCommandsCreateIngress(node.Interface)
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+ default:
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+ logger.Log(3, "creating ingress gateway using nftables is not present")
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+ postUpCmd, postDownCmd = firewallIPTablesCommandsCreateIngress(node.Interface)
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+ }
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+
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if node.PostUp != "" {
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if !strings.Contains(node.PostUp, postUpCmd) {
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- postUpCmd = node.PostUp + "; " + postUpCmd
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+ postUpCmd = node.PostUp + " ; " + postUpCmd
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}
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}
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if node.PostDown != "" {
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if !strings.Contains(node.PostDown, postDownCmd) {
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- postDownCmd = node.PostDown + "; " + postDownCmd
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+ postDownCmd = node.PostDown + " ; " + postDownCmd
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}
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}
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node.SetLastModified()
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@@ -214,12 +235,26 @@ func DeleteIngressGateway(networkName string, nodeid string) (models.Node, error
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if err = DeleteGatewayExtClients(node.ID, networkName); err != nil {
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return models.Node{}, err
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}
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+ logger.Log(3, "deleting ingress gateway")
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node.UDPHolePunch = network.DefaultUDPHolePunch
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node.LastModified = time.Now().Unix()
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node.IsIngressGateway = "no"
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node.IngressGatewayRange = ""
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+ // default to removing postup and postdown
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+ node.PostUp = ""
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+ node.PostDown = ""
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+
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+ logger.Log(3, "deleting ingress gateway firewall in use is '", node.FirewallInUse, "' and isEgressGateway is", node.IsEgressGateway)
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+ if node.EgressGatewayRequest.NodeID != "" {
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+ _, err := CreateEgressGateway(node.EgressGatewayRequest)
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+ if err != nil {
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+ logger.Log(0, fmt.Sprintf("failed to create egress gateway on node [%s] on network [%s]: %v",
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+ node.EgressGatewayRequest.NodeID, node.EgressGatewayRequest.NetID, err))
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+ }
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+ }
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+
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data, err := json.Marshal(&node)
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if err != nil {
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return models.Node{}, err
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@@ -248,3 +283,81 @@ func DeleteGatewayExtClients(gatewayID string, networkName string) error {
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}
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return nil
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}
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+
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+// firewallNFTCommandsCreateIngress - used to centralize firewall command maintenance for creating an ingress gateway using the nftables firewall.
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+func firewallNFTCommandsCreateIngress(networkInterface string) (string, string) {
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+ // spacing around ; is important for later parsing of postup/postdown in wireguard/common.go
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+ postUp := "nft add table ip filter ; "
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+ postUp += "nft add chain ip filter FORWARD ; "
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+ postUp += "nft add rule ip filter FORWARD iifname " + networkInterface + " counter accept ; "
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+ postUp += "nft add rule ip filter FORWARD oifname " + networkInterface + " counter accept ; "
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+ postUp += "nft add table nat ; "
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+ postUp += "nft add chain nat POSTROUTING ; "
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+ postUp += "nft add rule ip nat POSTROUTING oifname " + networkInterface + " counter masquerade"
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+
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+ // doesn't remove potentially empty tables or chains
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+ postDown := "nft flush table filter ; "
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+ postDown += "nft flush table nat ; "
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+
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+ return postUp, postDown
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+}
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+
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+// firewallNFTCommandsCreateEgress - used to centralize firewall command maintenance for creating an egress gateway using the nftables firewall.
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+func firewallNFTCommandsCreateEgress(networkInterface string, gatewayInterface string, gatewayranges []string, egressNatEnabled string) (string, string) {
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+ // spacing around ; is important for later parsing of postup/postdown in wireguard/common.go
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+ postUp := "nft add table ip filter ; "
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+ postUp += "nft add chain ip filter forward ; "
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+ postUp += "nft add rule filter forward ct state related,established accept ; "
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+ postUp += "nft add rule ip filter forward iifname " + networkInterface + " accept ; "
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+ postUp += "nft add rule ip filter forward oifname " + networkInterface + " accept ; "
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+ postUp += "nft add table nat ; "
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+ postUp += "nft 'add chain ip nat prerouting { type nat hook prerouting priority 0 ;}' ; "
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+ postUp += "nft 'add chain ip nat postrouting { type nat hook postrouting priority 0 ;}' ; "
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+ for _, networkCIDR := range gatewayranges {
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+ postUp += "nft add rule nat postrouting iifname " + networkInterface + " oifname " + gatewayInterface + " ip saddr " + networkCIDR + " masquerade ; "
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+ }
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+
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+ postDown := "nft flush table filter ; "
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+
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+ if egressNatEnabled == "yes" {
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+ postUp += "nft add table nat ; "
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+ postUp += "nft add chain nat POSTROUTING ; "
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+ postUp += "nft add rule ip nat POSTROUTING oifname " + gatewayInterface + " counter masquerade ; "
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+
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+ postDown += "nft flush table nat ; "
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+ }
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+
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+ return postUp, postDown
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+}
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+
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+// firewallIPTablesCommandsCreateIngress - used to centralize firewall command maintenance for creating an ingress gateway using the iptables firewall.
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+func firewallIPTablesCommandsCreateIngress(networkInterface string) (string, string) {
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+ // spacing around ; is important for later parsing of postup/postdown in wireguard/common.go
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+ postUp := "iptables -A FORWARD -i " + networkInterface + " -j ACCEPT ; "
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+ postUp += "iptables -A FORWARD -o " + networkInterface + " -j ACCEPT ; "
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+ postUp += "iptables -t nat -A POSTROUTING -o " + networkInterface + " -j MASQUERADE"
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+
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+ // doesn't remove potentially empty tables or chains
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+ postDown := "iptables -D FORWARD -i " + networkInterface + " -j ACCEPT ; "
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+ postDown += "iptables -D FORWARD -o " + networkInterface + " -j ACCEPT ; "
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+ postDown += "iptables -t nat -D POSTROUTING -o " + networkInterface + " -j MASQUERADE"
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+
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+ return postUp, postDown
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+}
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+
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+// firewallIPTablesCommandsCreateEgress - used to centralize firewall command maintenance for creating an egress gateway using the iptables firewall.
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+func firewallIPTablesCommandsCreateEgress(networkInterface string, gatewayInterface string, egressNatEnabled string) (string, string) {
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+ // spacing around ; is important for later parsing of postup/postdown in wireguard/common.go
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+ postUp := "iptables -A FORWARD -i " + networkInterface + " -j ACCEPT ; "
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+ postUp += "iptables -A FORWARD -o " + networkInterface + " -j ACCEPT"
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+ postDown := "iptables -D FORWARD -i " + networkInterface + " -j ACCEPT ; "
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+ postDown += "iptables -D FORWARD -o " + networkInterface + " -j ACCEPT"
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+
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+ if egressNatEnabled == "yes" {
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+ postUp += " ; iptables -t nat -A POSTROUTING -o " + gatewayInterface + " -j MASQUERADE"
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+ postDown += " ; iptables -t nat -D POSTROUTING -o " + gatewayInterface + " -j MASQUERADE"
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+ }
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+
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+ return postUp, postDown
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+
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+}
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