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go-captiveportal
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feat: captive portal middleware with ARP table based client identifier

This commit is contained in:
wpetit 2020-10-18 15:28:34 +02:00
parent 2390ed2d15
commit 5bd8875244
14 changed files with 618 additions and 48 deletions
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5
Makefile Normal file
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@ -0,0 +1,5 @@
watch:
modd
test:
go test -v -race ./...

8
arp/error.go Normal file
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@ -0,0 +1,8 @@
package arp
import "errors"
var (
ErrNotFound = errors.New("not found")
ErrIfaceNotFound = errors.New("iface not found")
)

42
arp/identifier.go Normal file
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@ -0,0 +1,42 @@
package arp
import (
"context"
"net/http"
"strings"
"github.com/pkg/errors"
)
type Identifier struct {
arp *Table
}
func (i *Identifier) Watch(ctx context.Context, config WatchConfig) error {
return i.arp.Watch(ctx, config)
}
func (i *Identifier) Identify(r *http.Request) (string, error) {
ip := strings.SplitN(r.RemoteAddr, ":", 2)[0]
mac, err := i.arp.FindMACByIP(ip)
if err != nil {
if errors.Is(err, ErrNotFound) {
return "", nil
}
return "", errors.WithStack(err)
}
return mac, nil
}
func (i *Identifier) OnOffline(fn func(id string)) {
i.arp.OnOffline(fn)
}
func NewIdentifier() *Identifier {
return &Identifier{
arp: NewTable(),
}
}

153
arp/table.go Normal file
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@ -0,0 +1,153 @@
package arp
import (
"context"
"net"
"sync"
"time"
"github.com/irai/arp"
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/logger"
)
type Table struct {
mutex sync.RWMutex
onOffline func(id string)
entries map[string]string
}
type WatchConfig struct {
RouterIP string
RouterNetwork string
HostIP string
NIC string
OfflineDeadline time.Duration
ProbeInterval time.Duration
PurgeDeadline time.Duration
}
func (t *Table) Watch(ctx context.Context, config WatchConfig) error {
ipRouter := net.ParseIP(config.RouterIP).To4()
ipHost := net.ParseIP(config.HostIP).To4()
_, lanNetwork, err := net.ParseCIDR(config.RouterNetwork)
if err != nil {
return errors.WithStack(err)
}
hostMac, err := t.getMACAddress(config.NIC)
if err != nil {
return errors.WithStack(err)
}
h, err := arp.New(arp.Config{
HostMAC: hostMac,
HostIP: ipHost,
HomeLAN: *lanNetwork,
NIC: config.NIC,
RouterIP: ipRouter,
OfflineDeadline: config.OfflineDeadline,
ProbeInterval: config.ProbeInterval,
PurgeDeadline: config.PurgeDeadline,
})
if err != nil {
return errors.WithStack(err)
}
go func() {
if err := h.ListenAndServe(ctx); err != nil {
panic(errors.WithStack(err))
}
}()
notifications := make(chan arp.MACEntry)
h.AddNotificationChannel(notifications)
go t.handleNotifications(ctx, notifications)
return nil
}
func (t *Table) FindMACByIP(ip string) (string, error) {
t.mutex.RLock()
defer t.mutex.RUnlock()
mac, exists := t.entries[ip]
if !exists {
return "", errors.WithStack(ErrNotFound)
}
return mac, nil
}
func (t *Table) Count() int {
t.mutex.RLock()
defer t.mutex.RUnlock()
return len(t.entries)
}
func (t *Table) handleNotifications(ctx context.Context, notifications chan arp.MACEntry) {
for {
select {
case <-ctx.Done():
return
case entry := <-notifications:
logger.Debug(ctx, "arp notification", logger.F("entry", entry))
ip := entry.IP().String()
if entry.Online {
t.add(ip, entry.MAC.String())
} else {
t.delete(ip)
}
}
}
}
func (t *Table) add(ip string, mac string) {
t.mutex.Lock()
defer t.mutex.Unlock()
t.entries[ip] = mac
}
func (t *Table) delete(ip string) {
t.mutex.Lock()
defer t.mutex.Unlock()
mac, exists := t.entries[ip]
delete(t.entries, ip)
if exists && t.onOffline != nil {
t.onOffline(mac)
}
}
func (t *Table) getMACAddress(nic string) (net.HardwareAddr, error) {
ifaces, err := net.Interfaces()
if err != nil {
return nil, errors.WithStack(err)
}
for _, iface := range ifaces {
if iface.Name == nic {
return iface.HardwareAddr, nil
}
}
return nil, errors.WithStack(ErrIfaceNotFound)
}
func (t *Table) OnOffline(fn func(id string)) {
t.onOffline = fn
}
func NewTable() *Table {
return &Table{
entries: make(map[string]string),
}
}

6
go.mod
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@ -2,4 +2,8 @@ module forge.cadoles.com/wpetit/go-captiveportal
go 1.15
require github.com/pkg/errors v0.9.1
require (
github.com/irai/arp v1.3.1
github.com/pkg/errors v0.9.1
gitlab.com/wpetit/goweb v0.0.0-20200707070104-985ce3eba3c2
)

257
go.sum
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@ -1,2 +1,259 @@
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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
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golang.org/x/sys v0.0.0-20191210023423-ac6580df4449/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20200803210538-64077c9b5642/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
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golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
google.golang.org/api v0.14.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
google.golang.org/genproto v0.0.0-20191115194625-c23dd37a84c9/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20191216164720-4f79533eabd1 h1:aQktFqmDE2yjveXJlVIfslDFmFnUXSqG0i6KRcJAeMc=
google.golang.org/genproto v0.0.0-20191216164720-4f79533eabd1/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.25.1 h1:wdKvqQk7IttEw92GoRyKG2IDrUIpgpj6H6m81yfeMW0=
google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
gopkg.in/go-playground/validator.v9 v9.29.1/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=

15
identifier.go
View File

@ -1,17 +1,10 @@
package captiveportal
import "net/http"
import (
"net/http"
)
type Identifier interface {
Identify(r *http.Request) (string, error)
}
type IdentifierFunc func(r *http.Request) (string, error)
func (f IdentifierFunc) Identify(r *http.Request) (string, error) {
return f(r)
}
func DefaultIdentifier(r *http.Request) (string, error) {
return "", nil
OnOffline(func(id string))
}

18
matcher.go
View File

@ -39,7 +39,7 @@ func MatchAndroid(r *http.Request) (bool, error) {
// http://g.cn
matches := strings.Contains(r.URL.Path, "generate_204") ||
strings.Contains(r.URL.Path, "gen_204") ||
r.URL.Hostname() == "g.cn"
strings.Contains(r.Host, "g.cn")
return matches, nil
}
@ -49,10 +49,8 @@ func MatchApple(r *http.Request) (bool, error) {
//
// http://www.apple.com/library/test/success.html
// http://captive.apple.com/hotspot-detect.html
hostname := r.URL.Hostname()
matches := hostname == "www.apple.com" ||
hostname == "captive.apple.com"
matches := strings.Contains(r.Host, "www.apple.com") ||
strings.Contains(r.Host, "captive.apple.com")
return matches, nil
}
@ -62,10 +60,8 @@ func MatchLinux(r *http.Request) (bool, error) {
//
// http://start.ubuntu.com/connectivity-check.html
// http://nmcheck.gnome.org/check_network_status.txt
hostname := r.URL.Hostname()
matches := hostname == "start.ubuntu.com" ||
hostname == "nmcheck.gnome.org"
matches := strings.Contains(r.Host, "start.ubuntu.com") ||
strings.Contains(r.Host, "nmcheck.gnome.org")
return matches, nil
}
@ -75,9 +71,7 @@ func MatchWindows(r *http.Request) (bool, error) {
//
// http://www.msftncsi.com
// http://www.msftncsi.com/ncsi.txt
hostname := r.URL.Hostname()
matches := hostname == "www.msftncsi.com"
matches := strings.Contains(r.Host, "www.msftncsi.com")
return matches, nil
}

33
middleware.go
View File

@ -4,6 +4,7 @@ import (
"net/http"
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/logger"
)
func (s *Service) Middleware() func(next http.Handler) http.Handler {
@ -13,33 +14,61 @@ func (s *Service) Middleware() func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
matches, os, err := matcher.Match(r)
if err != nil {
panic(errors.WithStack(err))
}
logger.Debug(
ctx, "applied captive portal matching",
logger.F("os", os),
logger.F("url", r.URL.String()),
logger.F("host", r.Host),
logger.F("matches", matches),
)
if !matches {
next.ServeHTTP(w, r)
return
}
id, err := s.options.Identifier.Identify(r)
id, err := s.identifier.Identify(r)
if err != nil {
panic(errors.Wrap(err, ErrClientIdentificationFailed.Error()))
}
logger.Debug(
ctx, "identified captive portal client",
logger.F("remoteAddr", r.RemoteAddr),
logger.F("id", id),
)
registry.Touch(id, os)
if registry.IsLying(id) {
logger.Debug(
ctx, "lying to captive portal client",
logger.F("remoteAddr", r.RemoteAddr),
logger.F("id", id),
)
liar.Handle(os, w, r)
return
}
if registry.IsCaptive(id) {
logger.Debug(
ctx, "capture captive portal client",
logger.F("remoteAddr", r.RemoteAddr),
logger.F("id", id),
)
// Redirect to configured URL
http.Redirect(w, r, s.captivePortalURL, http.StatusTemporaryRedirect)
http.Redirect(w, r, s.redirectURL, http.StatusTemporaryRedirect)
return
}

3
modd.conf Normal file
View File

@ -0,0 +1,3 @@
**/*.go {
prep: make test
}

10
option.go
View File

@ -1,17 +1,15 @@
package captiveportal
type Options struct {
Identifier Identifier
Matcher Matcher
Liar Liar
Matcher Matcher
Liar Liar
}
type OptionsFunc func(*Options)
func DefaultOptions() *Options {
return &Options{
Identifier: IdentifierFunc(DefaultIdentifier),
Matcher: MatchFunc(DefaultMatch),
Liar: LiarFunc(DefaultLiar),
Matcher: MatchFunc(DefaultMatch),
Liar: LiarFunc(DefaultLiar),
}
}

42
provider.go Normal file
View File

@ -0,0 +1,42 @@
package captiveportal
import (
"github.com/pkg/errors"
"gitlab.com/wpetit/goweb/service"
)
const (
ServiceName service.Name = "captiveportal"
)
func ServiceProvider(redirectURL string, identifier Identifier, opts ...OptionsFunc) service.Provider {
srv := New(redirectURL, identifier, opts...)
return func(ctn *service.Container) (interface{}, error) {
return srv, nil
}
}
// From retrieves the service in the given container
func From(container *service.Container) (*Service, error) {
service, err := container.Service(ServiceName)
if err != nil {
return nil, errors.Wrapf(err, "error while retrieving '%s' service", ServiceName)
}
srv, ok := service.(*Service)
if !ok {
return nil, errors.Errorf("retrieved service is not a valid '%s' service", ServiceName)
}
return srv, nil
}
// Must retrieves the service in the given container or panic otherwise
func Must(container *service.Container) *Service {
srv, err := From(container)
if err != nil {
panic(err)
}
return srv
}

32
registry.go
View File

@ -2,14 +2,13 @@ package captiveportal
import (
"sync"
"time"
)
type Client struct {
LastSeen time.Time
Captive bool
Lying bool
OS OS
ID string
Captive bool
Lying bool
OS OS
}
type Registry struct {
@ -22,7 +21,6 @@ func (r *Registry) Touch(id string, os OS) {
defer r.mutex.Unlock()
client := r.upsert(id)
client.LastSeen = time.Now()
client.OS = os
}
@ -75,13 +73,33 @@ func (r *Registry) IsLying(id string) bool {
return false
}
return client.Captive
return client.Lying
}
func (r *Registry) Delete(id string) {
r.mutex.Lock()
defer r.mutex.Unlock()
delete(r.clients, id)
}
func (r *Registry) Clients() []Client {
r.mutex.RLock()
defer r.mutex.RUnlock()
clients := make([]Client, 0, len(r.clients))
for _, c := range r.clients {
clients = append(clients, *c)
}
return clients
}
func (r *Registry) upsert(id string) *Client {
client, exists := r.clients[id]
if !exists {
client = &Client{
ID: id,
Captive: true,
Lying: false,
OS: OSUnknown,

42
service.go
View File

@ -7,13 +7,14 @@ import (
)
type Service struct {
captivePortalURL string
options *Options
registry *Registry
redirectURL string
identifier Identifier
options *Options
registry *Registry
}
func (s *Service) ClientID(r *http.Request) (string, error) {
id, err := s.options.Identifier.Identify(r)
id, err := s.identifier.Identify(r)
if err != nil {
return "", errors.Wrap(err, ErrClientIdentificationFailed.Error())
}
@ -27,6 +28,10 @@ func (s *Service) IsCaptive(r *http.Request) (bool, error) {
return false, errors.WithStack(err)
}
if id == "" {
return true, nil
}
return s.registry.IsCaptive(id), nil
}
@ -36,6 +41,10 @@ func (s *Service) Release(r *http.Request) error {
return errors.WithStack(err)
}
if id == "" {
return nil
}
s.registry.Release(id)
return nil
@ -47,6 +56,10 @@ func (s *Service) Lie(r *http.Request) error {
return errors.WithStack(err)
}
if id == "" {
return nil
}
s.registry.Lie(id)
return nil
@ -58,19 +71,30 @@ func (s *Service) ClientOS(r *http.Request) (OS, error) {
return OSUnknown, errors.WithStack(err)
}
if id == "" {
return OSUnknown, nil
}
return s.registry.ClientOS(id), nil
}
func New(captivePortalURL string, opts ...OptionsFunc) *Service {
func New(redirectURL string, identifier Identifier, opts ...OptionsFunc) *Service {
options := DefaultOptions()
for _, o := range opts {
o(options)
}
return &Service{
captivePortalURL: captivePortalURL,
options: options,
registry: NewRegistry(),
service := &Service{
identifier: identifier,
redirectURL: redirectURL,
options: options,
registry: NewRegistry(),
}
identifier.OnOffline(func(id string) {
service.registry.Delete(id)
})
return service
}