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control/controlclient, wgengine/filter: extract parsePacketFilter to … (#696)

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control/controlclient, wgengine/filter: extract parsePacketFilter to new constructor in wgengine/filter

Signed-off-by: chungdaniel <daniel@tailscale.com>
This commit is contained in:
chungdaniel 2020-08-20 13:36:19 -04:00 committed by GitHub
parent 9cb2df4ddd
commit 4d56d19b46
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 108 additions and 113 deletions
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74
control/controlclient/filter.go
View File

@ -5,84 +5,16 @@
package controlclient
import (
"fmt"
"net"
"tailscale.com/tailcfg"
"tailscale.com/wgengine/filter"
)
func parseIP(host string, defaultBits int) (filter.Net, error) {
ip := net.ParseIP(host)
if ip != nil && ip.IsUnspecified() {
// For clarity, reject 0.0.0.0 as an input
return filter.NetNone, fmt.Errorf("ports=%#v: to allow all IP addresses, use *:port, not 0.0.0.0:port", host)
} else if ip == nil && host == "*" {
// User explicitly requested wildcard dst ip
return filter.NetAny, nil
} else {
if ip != nil {
ip = ip.To4()
}
if ip == nil || len(ip) != 4 {
return filter.NetNone, fmt.Errorf("ports=%#v: invalid IPv4 address", host)
}
if len(ip) == 4 && (defaultBits < 0 || defaultBits > 32) {
return filter.NetNone, fmt.Errorf("invalid CIDR size %d for host %q", defaultBits, host)
}
return filter.Net{
IP: filter.NewIP(ip),
Mask: filter.Netmask(defaultBits),
}, nil
}
}
// Parse a backward-compatible FilterRule used by control's wire format,
// producing the most current filter.Matches format.
func (c *Direct) parsePacketFilter(pf []tailcfg.FilterRule) filter.Matches {
mm := make([]filter.Match, 0, len(pf))
var erracc error
for _, r := range pf {
m := filter.Match{}
for i, s := range r.SrcIPs {
bits := 32
if len(r.SrcBits) > i {
bits = r.SrcBits[i]
}
net, err := parseIP(s, bits)
if err != nil && erracc == nil {
erracc = err
continue
}
m.Srcs = append(m.Srcs, net)
}
for _, d := range r.DstPorts {
bits := 32
if d.Bits != nil {
bits = *d.Bits
}
net, err := parseIP(d.IP, bits)
if err != nil && erracc == nil {
erracc = err
continue
}
m.Dsts = append(m.Dsts, filter.NetPortRange{
Net: net,
Ports: filter.PortRange{
First: d.Ports.First,
Last: d.Ports.Last,
},
})
}
mm = append(mm, m)
}
if erracc != nil {
c.logf("parsePacketFilter: %s\n", erracc)
mm, err := filter.MatchesFromFilterRules(pf)
if err != nil {
c.logf("parsePacketFilter: %s\n", err)
}
return mm
}

42
control/controlclient/filter_test.go
View File

@ -1,42 +0,0 @@
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package controlclient
import (
"net"
"testing"
"tailscale.com/wgengine/filter"
"tailscale.com/wgengine/packet"
)
func TestParseIP(t *testing.T) {
tests := []struct {
host string
bits int
want filter.Net
wantErr string
}{
{"8.8.8.8", 24, filter.Net{IP: packet.NewIP(net.ParseIP("8.8.8.8")), Mask: packet.NewIP(net.ParseIP("255.255.255.0"))}, ""},
{"8.8.8.8", 33, filter.Net{}, `invalid CIDR size 33 for host "8.8.8.8"`},
{"8.8.8.8", -1, filter.Net{}, `invalid CIDR size -1 for host "8.8.8.8"`},
{"0.0.0.0", 24, filter.Net{}, `ports="0.0.0.0": to allow all IP addresses, use *:port, not 0.0.0.0:port`},
{"*", 24, filter.NetAny, ""},
{"fe80::1", 128, filter.NetNone, `ports="fe80::1": invalid IPv4 address`},
}
for _, tt := range tests {
got, err := parseIP(tt.host, tt.bits)
if err != nil {
if err.Error() == tt.wantErr {
continue
}
t.Errorf("parseIP(%q, %v) error: %v; want error %q", tt.host, tt.bits, err, tt.wantErr)
}
if got != tt.want {
t.Errorf("parseIP(%q, %v) = %#v; want %#v", tt.host, tt.bits, got, tt.want)
continue
}
}
}

75
wgengine/filter/filter.go
View File

@ -7,11 +7,13 @@
import (
"fmt"
"net"
"sync"
"time"
"github.com/golang/groupcache/lru"
"golang.org/x/time/rate"
"tailscale.com/tailcfg"
"tailscale.com/types/logger"
"tailscale.com/wgengine/packet"
)
@ -129,6 +131,79 @@ func maybeHexdump(flag RunFlags, b []byte) string {
return packet.Hexdump(b) + "\n"
}
// MatchesFromFilterRules parse a number of wire-format FilterRule values into
// the Matches format.
// If an error is returned, the Matches result is still valid, containing the rules that
// were successfully converted.
func MatchesFromFilterRules(pf []tailcfg.FilterRule) (Matches, error) {
mm := make([]Match, 0, len(pf))
var erracc error
for _, r := range pf {
m := Match{}
for i, s := range r.SrcIPs {
bits := 32
if len(r.SrcBits) > i {
bits = r.SrcBits[i]
}
net, err := parseIP(s, bits)
if err != nil && erracc == nil {
erracc = err
continue
}
m.Srcs = append(m.Srcs, net)
}
for _, d := range r.DstPorts {
bits := 32
if d.Bits != nil {
bits = *d.Bits
}
net, err := parseIP(d.IP, bits)
if err != nil && erracc == nil {
erracc = err
continue
}
m.Dsts = append(m.Dsts, NetPortRange{
Net: net,
Ports: PortRange{
First: d.Ports.First,
Last: d.Ports.Last,
},
})
}
mm = append(mm, m)
}
return mm, erracc
}
func parseIP(host string, defaultBits int) (Net, error) {
ip := net.ParseIP(host)
if ip != nil && ip.IsUnspecified() {
// For clarity, reject 0.0.0.0 as an input
return NetNone, fmt.Errorf("ports=%#v: to allow all IP addresses, use *:port, not 0.0.0.0:port", host)
} else if ip == nil && host == "*" {
// User explicitly requested wildcard dst ip
return NetAny, nil
} else {
if ip != nil {
ip = ip.To4()
}
if ip == nil || len(ip) != 4 {
return NetNone, fmt.Errorf("ports=%#v: invalid IPv4 address", host)
}
if len(ip) == 4 && (defaultBits < 0 || defaultBits > 32) {
return NetNone, fmt.Errorf("invalid CIDR size %d for host %q", defaultBits, host)
}
return Net{
IP: NewIP(ip),
Mask: Netmask(defaultBits),
}, nil
}
}
// TODO(apenwarr): use a bigger bucket for specifically TCP SYN accept logging?
// Logging is a quick way to record every newly opened TCP connection, but
// we have to be cautious about flooding the logs vs letting people use

30
wgengine/filter/filter_test.go
View File

@ -8,6 +8,7 @@
"encoding/binary"
"encoding/hex"
"encoding/json"
"net"
"strings"
"testing"
@ -162,6 +163,35 @@ func TestNoAllocs(t *testing.T) {
}
}
func TestParseIP(t *testing.T) {
tests := []struct {
host string
bits int
want Net
wantErr string
}{
{"8.8.8.8", 24, Net{IP: packet.NewIP(net.ParseIP("8.8.8.8")), Mask: packet.NewIP(net.ParseIP("255.255.255.0"))}, ""},
{"8.8.8.8", 33, Net{}, `invalid CIDR size 33 for host "8.8.8.8"`},
{"8.8.8.8", -1, Net{}, `invalid CIDR size -1 for host "8.8.8.8"`},
{"0.0.0.0", 24, Net{}, `ports="0.0.0.0": to allow all IP addresses, use *:port, not 0.0.0.0:port`},
{"*", 24, NetAny, ""},
{"fe80::1", 128, NetNone, `ports="fe80::1": invalid IPv4 address`},
}
for _, tt := range tests {
got, err := parseIP(tt.host, tt.bits)
if err != nil {
if err.Error() == tt.wantErr {
continue
}
t.Errorf("parseIP(%q, %v) error: %v; want error %q", tt.host, tt.bits, err, tt.wantErr)
}
if got != tt.want {
t.Errorf("parseIP(%q, %v) = %#v; want %#v", tt.host, tt.bits, got, tt.want)
continue
}
}
}
func BenchmarkFilter(b *testing.B) {
acl := newFilter(b.Logf)