628 lines
16 KiB
Go
628 lines
16 KiB
Go
// Package netconfig implements network configuration (interfaces, addresses, firewall rules, …).
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package netconfig
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"syscall"
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"github.com/google/nftables"
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"github.com/google/nftables/binaryutil"
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"github.com/google/nftables/expr"
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"github.com/vishvananda/netlink"
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"golang.org/x/sys/unix"
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"router7/internal/dhcp4"
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"router7/internal/dhcp6"
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"router7/internal/notify"
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"router7/internal/teelogger"
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)
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var log = teelogger.NewConsole()
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func subnetMaskSize(mask string) (int, error) {
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parts := strings.Split(mask, ".")
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if got, want := len(parts), 4; got != want {
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return 0, fmt.Errorf("unexpected number of parts in subnet mask %q: got %d, want %d", mask, got, want)
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}
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numeric := make([]byte, len(parts))
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for idx, part := range parts {
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i, err := strconv.ParseUint(part, 0, 8)
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if err != nil {
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return 0, err
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}
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numeric[idx] = byte(i)
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}
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ones, _ := net.IPv4Mask(numeric[0], numeric[1], numeric[2], numeric[3]).Size()
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return ones, nil
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}
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func applyDhcp4(dir string) error {
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b, err := ioutil.ReadFile(filepath.Join(dir, "dhcp4/wire/lease.json"))
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if err != nil {
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if os.IsNotExist(err) {
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return nil // dhcp4 might not have obtained a lease yet
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}
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return err
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}
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var got dhcp4.Config
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if err := json.Unmarshal(b, &got); err != nil {
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return err
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}
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link, err := netlink.LinkByName("uplink0")
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if err != nil {
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return err
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}
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if got.SubnetMask == "" {
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return fmt.Errorf("invalid DHCP lease: no subnet mask present")
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}
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subnetSize, err := subnetMaskSize(got.SubnetMask)
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if err != nil {
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return err
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}
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addr, err := netlink.ParseAddr(fmt.Sprintf("%s/%d", got.ClientIP, subnetSize))
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if err != nil {
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return err
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}
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h, err := netlink.NewHandle()
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if err != nil {
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return fmt.Errorf("netlink.NewHandle: %v", err)
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}
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if err := h.AddrReplace(link, addr); err != nil {
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return fmt.Errorf("AddrReplace(%v): %v", addr, err)
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}
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// from include/uapi/linux/rtnetlink.h
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const (
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RTPROT_STATIC = 4
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RTPROT_DHCP = 16
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)
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if err := h.RouteReplace(&netlink.Route{
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LinkIndex: link.Attrs().Index,
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Dst: &net.IPNet{
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IP: net.ParseIP(got.Router),
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Mask: net.CIDRMask(32, 32),
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},
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Src: net.ParseIP(got.ClientIP),
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Scope: netlink.SCOPE_LINK,
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Protocol: RTPROT_DHCP,
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}); err != nil {
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return fmt.Errorf("RouteReplace(router): %v", err)
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}
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if err := h.RouteReplace(&netlink.Route{
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LinkIndex: link.Attrs().Index,
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Dst: &net.IPNet{
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IP: net.ParseIP("0.0.0.0"),
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Mask: net.CIDRMask(0, 32),
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},
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Gw: net.ParseIP(got.Router),
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Src: net.ParseIP(got.ClientIP),
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Protocol: RTPROT_DHCP,
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}); err != nil {
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return fmt.Errorf("RouteReplace(default): %v", err)
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}
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return nil
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}
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func applyDhcp6(dir string) error {
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b, err := ioutil.ReadFile(filepath.Join(dir, "dhcp6/wire/lease.json"))
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if err != nil {
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if os.IsNotExist(err) {
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return nil // dhcp6 might not have obtained a lease yet
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}
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return err
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}
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var got dhcp6.Config
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if err := json.Unmarshal(b, &got); err != nil {
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return err
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}
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link, err := netlink.LinkByName("lan0")
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if err != nil {
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return err
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}
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for _, prefix := range got.Prefixes {
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// pick the first address of the prefix, e.g. address 2a02:168:4a00::1
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// for prefix 2a02:168:4a00::/48
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prefix.IP[len(prefix.IP)-1] = 1
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// Use the first /64 subnet within larger prefixes
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if ones, bits := prefix.Mask.Size(); ones < 64 {
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prefix.Mask = net.CIDRMask(64, bits)
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}
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addr, err := netlink.ParseAddr(prefix.String())
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if err != nil {
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return err
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}
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if err := netlink.AddrReplace(link, addr); err != nil {
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return fmt.Errorf("AddrReplace(%v): %v", addr, err)
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}
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}
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return nil
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}
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type InterfaceDetails struct {
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HardwareAddr string `json:"hardware_addr"` // e.g. dc:9b:9c:ee:72:fd
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SpoofHardwareAddr string `json:"spoof_hardware_addr"` // e.g. dc:9b:9c:ee:72:fd
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Name string `json:"name"` // e.g. uplink0, or lan0
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Addr string `json:"addr"` // e.g. 192.168.42.1/24
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}
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type InterfaceConfig struct {
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Interfaces []InterfaceDetails `json:"interfaces"`
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}
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// LinkAddress returns the IP address configured for the interface ifname in
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// interfaces.json.
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func LinkAddress(dir, ifname string) (net.IP, error) {
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fn := filepath.Join(dir, "interfaces.json")
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b, err := ioutil.ReadFile(fn)
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if err != nil {
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return nil, err
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}
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var cfg InterfaceConfig
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if err := json.Unmarshal(b, &cfg); err != nil {
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return nil, err
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}
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for _, details := range cfg.Interfaces {
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if details.Name != ifname {
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continue
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}
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ip, _, err := net.ParseCIDR(details.Addr)
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return ip, err
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}
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return nil, fmt.Errorf("%s does not configure interface %q", fn, ifname)
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}
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func applyInterfaces(dir, root string) error {
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b, err := ioutil.ReadFile(filepath.Join(dir, "interfaces.json"))
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if err != nil {
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return err
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}
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var cfg InterfaceConfig
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if err := json.Unmarshal(b, &cfg); err != nil {
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return err
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}
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byHardwareAddr := make(map[string]InterfaceDetails)
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for _, details := range cfg.Interfaces {
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byHardwareAddr[details.HardwareAddr] = details
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if spoof := details.SpoofHardwareAddr; spoof != "" {
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byHardwareAddr[spoof] = details
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}
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}
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links, err := netlink.LinkList()
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for _, l := range links {
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attr := l.Attrs()
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// TODO: prefix log line with details about the interface.
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// link &{LinkAttrs:{Index:2 MTU:1500 TxQLen:1000 Name:eth0 HardwareAddr:00:0d:b9:49:70:18 Flags:broadcast|multicast RawFlags:4098 ParentIndex:0 MasterIndex:0 Namespace:<nil> Alias: Statistics:0xc4200f45f8 Promisc:0 Xdp:0xc4200ca180 EncapType:ether Protinfo:<nil> OperState:down NetNsID:0 NumTxQueues:0 NumRxQueues:0 Vfs:[]}}, attr &{Index:2 MTU:1500 TxQLen:1000 Name:eth0 HardwareAddr:00:0d:b9:49:70:18 Flags:broadcast|multicast RawFlags:4098 ParentIndex:0 MasterIndex:0 Namespace:<nil> Alias: Statistics:0xc4200f45f8 Promisc:0 Xdp:0xc4200ca180 EncapType:ether Protinfo:<nil> OperState:down NetNsID:0 NumTxQueues:0 NumRxQueues:0 Vfs:[]}
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addr := attr.HardwareAddr.String()
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details, ok := byHardwareAddr[addr]
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if !ok {
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if addr == "" {
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continue // not a configurable interface (e.g. sit0)
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}
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log.Printf("no config for hardwareattr %s", addr)
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continue
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}
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log.Printf("apply details %+v", details)
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if attr.Name != details.Name {
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if err := netlink.LinkSetName(l, details.Name); err != nil {
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return fmt.Errorf("LinkSetName(%q): %v", details.Name, err)
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}
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attr.Name = details.Name
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}
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if spoof := details.SpoofHardwareAddr; spoof != "" {
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hwaddr, err := net.ParseMAC(spoof)
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if err != nil {
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return fmt.Errorf("ParseMAC(%q): %v", spoof, err)
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}
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if err := netlink.LinkSetHardwareAddr(l, hwaddr); err != nil {
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return fmt.Errorf("LinkSetHardwareAddr(%v): %v", hwaddr, err)
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}
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}
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if attr.OperState != netlink.OperUp {
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// Set the interface to up, which is required by all other configuration.
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if err := netlink.LinkSetUp(l); err != nil {
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return fmt.Errorf("LinkSetUp(%s): %v", attr.Name, err)
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}
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}
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if details.Addr != "" {
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addr, err := netlink.ParseAddr(details.Addr)
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if err != nil {
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return fmt.Errorf("ParseAddr(%q): %v", details.Addr, err)
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}
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if err := netlink.AddrReplace(l, addr); err != nil {
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return fmt.Errorf("AddrReplace(%s, %v): %v", attr.Name, addr, err)
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}
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if details.Name == "lan0" {
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b := []byte("nameserver " + addr.IP.String() + "\n")
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fn := filepath.Join(root, "tmp", "resolv.conf")
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if err := os.Remove(fn); err != nil && !os.IsNotExist(err) {
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return err
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}
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if err := ioutil.WriteFile(fn, b, 0644); err != nil {
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return err
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}
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}
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}
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}
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return nil
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}
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func ifname(n string) []byte {
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b := make([]byte, 16)
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copy(b, []byte(n+"\x00"))
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return b
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}
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func portForwardExpr(proto uint8, portMin, portMax uint16, dest net.IP, dportMin, dportMax uint16) []expr.Any {
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var cmp []expr.Any
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if portMin == portMax {
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cmp = []expr.Any{
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// [ cmp eq reg 1 0x0000e60f ]
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&expr.Cmp{
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Op: expr.CmpOpEq,
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Register: 1,
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Data: binaryutil.BigEndian.PutUint16(portMin),
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},
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}
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} else {
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cmp = []expr.Any{
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// [ cmp gte reg 1 0x0000e60f ]
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&expr.Cmp{
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Op: expr.CmpOpGte,
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Register: 1,
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Data: binaryutil.BigEndian.PutUint16(portMin),
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},
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// [ cmp lte reg 1 0x0000fa0f ]
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&expr.Cmp{
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Op: expr.CmpOpLte,
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Register: 1,
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Data: binaryutil.BigEndian.PutUint16(portMax),
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},
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}
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}
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ex := []expr.Any{
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// [ meta load iifname => reg 1 ]
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&expr.Meta{Key: expr.MetaKeyIIFNAME, Register: 1},
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// [ cmp eq reg 1 0x696c7075 0x00306b6e 0x00000000 0x00000000 ]
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&expr.Cmp{
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Op: expr.CmpOpEq,
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Register: 1,
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Data: ifname("uplink0"),
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},
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// [ meta load l4proto => reg 1 ]
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&expr.Meta{Key: expr.MetaKeyL4PROTO, Register: 1},
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// [ cmp eq reg 1 0x00000006 ]
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&expr.Cmp{
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Op: expr.CmpOpEq,
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Register: 1,
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Data: []byte{proto},
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},
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// [ payload load 2b @ transport header + 2 => reg 1 ]
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&expr.Payload{
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DestRegister: 1,
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Base: expr.PayloadBaseTransportHeader,
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Offset: 2, // TODO
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Len: 2, // TODO
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},
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}
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ex = append(ex, cmp...)
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ex = append(ex,
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// [ immediate reg 1 0x0217a8c0 ]
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&expr.Immediate{
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Register: 1,
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Data: dest.To4(),
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},
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)
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if dportMin == dportMax {
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ex = append(ex,
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// [ immediate reg 2 0x0000f00f ]
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&expr.Immediate{
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Register: 2,
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Data: binaryutil.BigEndian.PutUint16(dportMin),
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},
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// [ nat dnat ip addr_min reg 1 addr_max reg 0 proto_min reg 2 proto_max reg 0 ]
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&expr.NAT{
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Type: expr.NATTypeDestNAT,
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Family: unix.NFPROTO_IPV4,
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RegAddrMin: 1,
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RegProtoMin: 2,
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},
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)
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} else {
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ex = append(ex,
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// [ immediate reg 2 0x0000e60f ]
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&expr.Immediate{
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Register: 2,
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Data: binaryutil.BigEndian.PutUint16(dportMin),
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},
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// [ immediate reg 3 0x0000fa0f ]
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&expr.Immediate{
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Register: 3,
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Data: binaryutil.BigEndian.PutUint16(dportMax),
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},
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// [ nat dnat ip addr_min reg 1 addr_max reg 0 proto_min reg 2 proto_max reg 3 ]
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&expr.NAT{
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Type: expr.NATTypeDestNAT,
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Family: unix.NFPROTO_IPV4,
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RegAddrMin: 1,
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RegProtoMin: 2,
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RegProtoMax: 3,
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},
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)
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}
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return ex
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}
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type portForwarding struct {
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Proto string `json:"proto"` // e.g. “tcp” (or “tcp,udp”)
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Port string `json:"port"` // e.g. “8080” (or “8080-8090”)
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DestAddr string `json:"dest_addr"` // e.g. “192.168.42.2”
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DestPort string `json:"dest_port"` // e.g. “80” (or “80-90”)
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}
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type portForwardings struct {
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Forwardings []portForwarding `json:"forwardings"`
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}
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var rangeRe = regexp.MustCompile(`^([0-9]+)(?:-([0-9]+))?$`)
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func parsePort(p string) (min uint16, max uint16, _ error) {
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matches := rangeRe.FindStringSubmatch(p)
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if len(matches) == 0 {
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return 0, 0, fmt.Errorf("malformed port %q, expected port number (e.g. 8080) or port range (e.g. 8080-8090)", p)
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}
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min64, err := strconv.ParseUint(matches[1], 0, 16)
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if err != nil {
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return 0, 0, fmt.Errorf("ParseInt(%q): %v", matches[1], err)
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}
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max64 := min64
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if matches[2] != "" {
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max64, err = strconv.ParseUint(matches[2], 0, 16)
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if err != nil {
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return 0, 0, fmt.Errorf("ParseInt(%q): %v", matches[2], err)
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}
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}
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return uint16(min64), uint16(max64), nil
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}
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func applyPortForwardings(dir string, c *nftables.Conn, nat *nftables.Table, prerouting *nftables.Chain) error {
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b, err := ioutil.ReadFile(filepath.Join(dir, "portforwardings.json"))
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if err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return err
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}
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var cfg portForwardings
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if err := json.Unmarshal(b, &cfg); err != nil {
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return err
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}
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for _, fw := range cfg.Forwardings {
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for _, proto := range strings.Split(fw.Proto, ",") {
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var p uint8
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switch proto {
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case "", "tcp":
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p = unix.IPPROTO_TCP
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case "udp":
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p = unix.IPPROTO_UDP
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default:
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return fmt.Errorf(`unknown proto %q, expected "tcp" or "udp"`, proto)
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}
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min, max, err := parsePort(fw.Port)
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if err != nil {
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return err
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}
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dmin, dmax, err := parsePort(fw.DestPort)
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if err != nil {
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return err
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}
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c.AddRule(&nftables.Rule{
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Table: nat,
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Chain: prerouting,
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Exprs: portForwardExpr(p, min, max, net.ParseIP(fw.DestAddr), dmin, dmax),
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})
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}
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}
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return nil
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}
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// DefaultCounter is overridden while testing
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var DefaultCounter expr.Counter
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func getCounter(c *nftables.Conn, table *nftables.Table, chain *nftables.Chain) expr.Counter {
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rules, err := c.GetRule(table, chain)
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if err != nil {
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return DefaultCounter
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}
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if got, want := len(rules), 1; got != want {
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log.Printf("could not carry counter values: unexpected number of rules in table %v, chain %v: got %d, want %d", table.Name, chain.Name, got, want)
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return DefaultCounter
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}
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if got, want := len(rules[0].Exprs), 1; got != want {
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log.Printf("could not carry counter values: unexpected number of exprs in rule 0 in table %v, chain %v: got %d, want %d", table.Name, chain.Name, got, want)
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return DefaultCounter
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}
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if ce, ok := rules[0].Exprs[0].(*expr.Counter); ok {
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return *ce
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}
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return DefaultCounter
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}
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func applyFirewall(dir string) error {
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c := &nftables.Conn{}
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c.FlushRuleset()
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nat := c.AddTable(&nftables.Table{
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Family: nftables.TableFamilyIPv4,
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Name: "nat",
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})
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prerouting := c.AddChain(&nftables.Chain{
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Name: "prerouting",
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Hooknum: nftables.ChainHookPrerouting,
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Priority: nftables.ChainPriorityFilter,
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Table: nat,
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Type: nftables.ChainTypeNAT,
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})
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postrouting := c.AddChain(&nftables.Chain{
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Name: "postrouting",
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Hooknum: nftables.ChainHookPostrouting,
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Priority: nftables.ChainPriorityNATSource,
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Table: nat,
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Type: nftables.ChainTypeNAT,
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|
})
|
|
|
|
c.AddRule(&nftables.Rule{
|
|
Table: nat,
|
|
Chain: postrouting,
|
|
Exprs: []expr.Any{
|
|
// meta load oifname => reg 1
|
|
&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
|
|
// cmp eq reg 1 0x696c7075 0x00306b6e 0x00000000 0x00000000
|
|
&expr.Cmp{
|
|
Op: expr.CmpOpEq,
|
|
Register: 1,
|
|
Data: ifname("uplink0"),
|
|
},
|
|
// masq
|
|
&expr.Masq{},
|
|
},
|
|
})
|
|
|
|
if err := applyPortForwardings(dir, c, nat, prerouting); err != nil {
|
|
return err
|
|
}
|
|
|
|
filter4 := c.AddTable(&nftables.Table{
|
|
Family: nftables.TableFamilyIPv4,
|
|
Name: "filter",
|
|
})
|
|
|
|
filter6 := c.AddTable(&nftables.Table{
|
|
Family: nftables.TableFamilyIPv6,
|
|
Name: "filter",
|
|
})
|
|
|
|
for _, filter := range []*nftables.Table{filter4, filter6} {
|
|
forward := c.AddChain(&nftables.Chain{
|
|
Name: "forward",
|
|
Hooknum: nftables.ChainHookForward,
|
|
Priority: nftables.ChainPriorityFilter,
|
|
Table: filter,
|
|
Type: nftables.ChainTypeFilter,
|
|
})
|
|
|
|
counter := getCounter(c, filter, forward)
|
|
|
|
c.AddRule(&nftables.Rule{
|
|
Table: filter,
|
|
Chain: forward,
|
|
Exprs: []expr.Any{
|
|
// [ counter pkts 23 bytes 42 ]
|
|
&counter,
|
|
},
|
|
})
|
|
}
|
|
|
|
return c.Flush()
|
|
}
|
|
|
|
func applySysctl() error {
|
|
if err := ioutil.WriteFile("/proc/sys/net/ipv4/ip_forward", []byte("1"), 0644); err != nil {
|
|
return fmt.Errorf("sysctl(net.ipv4.ip_forward=1): %v", err)
|
|
}
|
|
|
|
if err := ioutil.WriteFile("/proc/sys/net/ipv6/conf/all/forwarding", []byte("1"), 0644); err != nil {
|
|
return fmt.Errorf("sysctl(net.ipv6.conf.all.forwarding=1): %v", err)
|
|
}
|
|
|
|
if err := ioutil.WriteFile("/proc/sys/net/ipv6/conf/uplink0/accept_ra", []byte("2"), 0644); err != nil {
|
|
return fmt.Errorf("sysctl(net.ipv6.conf.uplink0.accept_ra=2): %v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func Apply(dir, root string) error {
|
|
|
|
// TODO: split into two parts: delay the up until later
|
|
if err := applyInterfaces(dir, root); err != nil {
|
|
return fmt.Errorf("interfaces: %v", err)
|
|
}
|
|
|
|
var firstErr error
|
|
|
|
if err := applyDhcp4(dir); err != nil {
|
|
if firstErr == nil {
|
|
firstErr = fmt.Errorf("dhcp4: %v", err)
|
|
} else {
|
|
log.Printf("cannot apply dhcp4 lease: %v", err)
|
|
}
|
|
}
|
|
|
|
if err := applyDhcp6(dir); err != nil {
|
|
if firstErr == nil {
|
|
firstErr = fmt.Errorf("dhcp6: %v", err)
|
|
} else {
|
|
log.Printf("cannot apply dhcp6 lease: %v", err)
|
|
}
|
|
}
|
|
|
|
for _, process := range []string{
|
|
"dyndns", // depends on the public IPv4 address
|
|
"dnsd", // listens on private IPv4/IPv6
|
|
"diagd", // listens on private IPv4/IPv6
|
|
"backupd", // listens on private IPv4/IPv6
|
|
"captured", // listens on private IPv4/IPv6
|
|
} {
|
|
if err := notify.Process("/user/"+process, syscall.SIGUSR1); err != nil {
|
|
log.Printf("notifying %s: %v", process, err)
|
|
}
|
|
}
|
|
|
|
if err := applySysctl(); err != nil {
|
|
if firstErr == nil {
|
|
firstErr = fmt.Errorf("sysctl: %v", err)
|
|
} else {
|
|
log.Printf("cannot apply sysctl config: %v", err)
|
|
}
|
|
}
|
|
|
|
if err := applyFirewall(dir); err != nil {
|
|
return fmt.Errorf("firewall: %v", err)
|
|
}
|
|
|
|
return firstErr
|
|
}
|