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waf.go
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waf.go
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package waf
import (
"errors"
"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs/firewallconfigs"
teaconst "github.com/TeaOSLab/EdgeNode/internal/const"
"github.com/TeaOSLab/EdgeNode/internal/waf/checkpoints"
"github.com/TeaOSLab/EdgeNode/internal/waf/requests"
"github.com/iwind/TeaGo/Tea"
"github.com/iwind/TeaGo/files"
"github.com/iwind/TeaGo/types"
"gopkg.in/yaml.v3"
"net/http"
"os"
"reflect"
)
type WAF struct {
Id int64 `yaml:"id" json:"id"`
IsOn bool `yaml:"isOn" json:"isOn"`
Name string `yaml:"name" json:"name"`
Inbound []*RuleGroup `yaml:"inbound" json:"inbound"`
Outbound []*RuleGroup `yaml:"outbound" json:"outbound"`
CreatedVersion string `yaml:"createdVersion" json:"createdVersion"`
Mode firewallconfigs.FirewallMode `yaml:"mode" json:"mode"`
UseLocalFirewall bool `yaml:"useLocalFirewall" json:"useLocalFirewall"`
SYNFlood *firewallconfigs.SYNFloodConfig `yaml:"synFlood" json:"synFlood"`
DefaultBlockAction *BlockAction
DefaultCaptchaAction *CaptchaAction
hasInboundRules bool
hasOutboundRules bool
checkpointsMap map[string]checkpoints.CheckpointInterface // prefix => checkpoint
actionMap map[int64]ActionInterface // actionId => ActionInterface
}
func NewWAF() *WAF {
return &WAF{
IsOn: true,
}
}
func NewWAFFromFile(path string) (waf *WAF, err error) {
if len(path) == 0 {
return nil, errors.New("'path' should not be empty")
}
file := files.NewFile(path)
if !file.Exists() {
return nil, errors.New("'" + path + "' not exist")
}
reader, err := file.Reader()
if err != nil {
return nil, err
}
defer func() {
_ = reader.Close()
}()
waf = &WAF{}
err = reader.ReadYAML(waf)
if err != nil {
return nil, err
}
return waf, nil
}
func (this *WAF) Init() (resultErrors []error) {
// checkpoint
this.checkpointsMap = map[string]checkpoints.CheckpointInterface{}
for _, def := range checkpoints.AllCheckpoints {
instance := reflect.New(reflect.Indirect(reflect.ValueOf(def.Instance)).Type()).Interface().(checkpoints.CheckpointInterface)
instance.Init()
this.checkpointsMap[def.Prefix] = instance
}
// action map
this.actionMap = map[int64]ActionInterface{}
// rules
this.hasInboundRules = len(this.Inbound) > 0
this.hasOutboundRules = len(this.Outbound) > 0
if this.hasInboundRules {
for _, group := range this.Inbound {
// finder
for _, set := range group.RuleSets {
for _, rule := range set.Rules {
rule.SetCheckpointFinder(this.FindCheckpointInstance)
}
}
err := group.Init(this)
if err != nil {
// 这里我们不阻止其他规则正常加入
resultErrors = append(resultErrors, errors.New("init group '"+types.String(group.Id)+"' failed: "+err.Error()))
}
}
}
if this.hasOutboundRules {
for _, group := range this.Outbound {
// finder
for _, set := range group.RuleSets {
for _, rule := range set.Rules {
rule.SetCheckpointFinder(this.FindCheckpointInstance)
}
}
err := group.Init(this)
if err != nil {
// 这里我们不阻止其他规则正常加入
resultErrors = append(resultErrors, err)
}
}
}
return nil
}
func (this *WAF) AddRuleGroup(ruleGroup *RuleGroup) {
if ruleGroup.IsInbound {
this.Inbound = append(this.Inbound, ruleGroup)
} else {
this.Outbound = append(this.Outbound, ruleGroup)
}
}
func (this *WAF) RemoveRuleGroup(ruleGroupId int64) {
{
result := []*RuleGroup{}
for _, group := range this.Inbound {
if group.Id == ruleGroupId {
continue
}
result = append(result, group)
}
this.Inbound = result
}
{
result := []*RuleGroup{}
for _, group := range this.Outbound {
if group.Id == ruleGroupId {
continue
}
result = append(result, group)
}
this.Outbound = result
}
}
func (this *WAF) FindRuleGroup(ruleGroupId int64) *RuleGroup {
for _, group := range this.Inbound {
if group.Id == ruleGroupId {
return group
}
}
for _, group := range this.Outbound {
if group.Id == ruleGroupId {
return group
}
}
return nil
}
func (this *WAF) FindRuleGroupWithCode(ruleGroupCode string) *RuleGroup {
if len(ruleGroupCode) == 0 {
return nil
}
for _, group := range this.Inbound {
if group.Code == ruleGroupCode {
return group
}
}
for _, group := range this.Outbound {
if group.Code == ruleGroupCode {
return group
}
}
return nil
}
func (this *WAF) MoveInboundRuleGroup(fromIndex int, toIndex int) {
if fromIndex < 0 || fromIndex >= len(this.Inbound) {
return
}
if toIndex < 0 || toIndex >= len(this.Inbound) {
return
}
if fromIndex == toIndex {
return
}
group := this.Inbound[fromIndex]
result := []*RuleGroup{}
for i := 0; i < len(this.Inbound); i++ {
if i == fromIndex {
continue
}
if fromIndex > toIndex && i == toIndex {
result = append(result, group)
}
result = append(result, this.Inbound[i])
if fromIndex < toIndex && i == toIndex {
result = append(result, group)
}
}
this.Inbound = result
}
func (this *WAF) MoveOutboundRuleGroup(fromIndex int, toIndex int) {
if fromIndex < 0 || fromIndex >= len(this.Outbound) {
return
}
if toIndex < 0 || toIndex >= len(this.Outbound) {
return
}
if fromIndex == toIndex {
return
}
group := this.Outbound[fromIndex]
result := []*RuleGroup{}
for i := 0; i < len(this.Outbound); i++ {
if i == fromIndex {
continue
}
if fromIndex > toIndex && i == toIndex {
result = append(result, group)
}
result = append(result, this.Outbound[i])
if fromIndex < toIndex && i == toIndex {
result = append(result, group)
}
}
this.Outbound = result
}
func (this *WAF) MatchRequest(req requests.Request, writer http.ResponseWriter) (goNext bool, hasRequestBody bool, group *RuleGroup, sets *RuleSet, err error) {
if !this.hasInboundRules {
return true, hasRequestBody, nil, nil, nil
}
// validate captcha
var rawPath = req.WAFRaw().URL.Path
if rawPath == CaptchaPath {
captchaValidator.Run(req, writer)
return
}
// Get 302验证
if rawPath == Get302Path {
get302Validator.Run(req, writer)
return
}
// match rules
for _, group := range this.Inbound {
if !group.IsOn {
continue
}
b, hasCheckedRequestBody, set, err := group.MatchRequest(req)
if hasCheckedRequestBody {
hasRequestBody = true
}
if err != nil {
return true, hasRequestBody, nil, nil, err
}
if b {
continueRequest, goNextSet := set.PerformActions(this, group, req, writer)
if !goNextSet {
return continueRequest, hasRequestBody, group, set, nil
}
}
}
return true, hasRequestBody, nil, nil, nil
}
func (this *WAF) MatchResponse(req requests.Request, rawResp *http.Response, writer http.ResponseWriter) (goNext bool, hasRequestBody bool, group *RuleGroup, set *RuleSet, err error) {
if !this.hasOutboundRules {
return true, hasRequestBody, nil, nil, nil
}
resp := requests.NewResponse(rawResp)
for _, group := range this.Outbound {
if !group.IsOn {
continue
}
b, hasCheckedRequestBody, set, err := group.MatchResponse(req, resp)
if hasCheckedRequestBody {
hasRequestBody = true
}
if err != nil {
return true, hasRequestBody, nil, nil, err
}
if b {
continueRequest, goNextSet := set.PerformActions(this, group, req, writer)
if !goNextSet {
return continueRequest, hasRequestBody, group, set, nil
}
}
}
return true, hasRequestBody, nil, nil, nil
}
// Save save to file path
func (this *WAF) Save(path string) error {
if len(path) == 0 {
return errors.New("path should not be empty")
}
if len(this.CreatedVersion) == 0 {
this.CreatedVersion = teaconst.Version
}
data, err := yaml.Marshal(this)
if err != nil {
return err
}
return os.WriteFile(path, data, 0644)
}
func (this *WAF) ContainsGroupCode(code string) bool {
if len(code) == 0 {
return false
}
for _, group := range this.Inbound {
if group.Code == code {
return true
}
}
for _, group := range this.Outbound {
if group.Code == code {
return true
}
}
return false
}
func (this *WAF) AddAction(action ActionInterface) {
this.actionMap[action.ActionId()] = action
}
func (this *WAF) FindAction(actionId int64) ActionInterface {
return this.actionMap[actionId]
}
func (this *WAF) Copy() *WAF {
var waf = &WAF{
Id: this.Id,
IsOn: this.IsOn,
Name: this.Name,
Inbound: this.Inbound,
Outbound: this.Outbound,
}
return waf
}
func (this *WAF) CountInboundRuleSets() int {
count := 0
for _, group := range this.Inbound {
count += len(group.RuleSets)
}
return count
}
func (this *WAF) CountOutboundRuleSets() int {
count := 0
for _, group := range this.Outbound {
count += len(group.RuleSets)
}
return count
}
func (this *WAF) FindCheckpointInstance(prefix string) checkpoints.CheckpointInterface {
instance, ok := this.checkpointsMap[prefix]
if ok {
return instance
}
return nil
}
// Start start
func (this *WAF) Start() {
for _, checkpoint := range this.checkpointsMap {
checkpoint.Start()
}
}
// Stop call stop() when the waf was deleted
func (this *WAF) Stop() {
for _, checkpoint := range this.checkpointsMap {
checkpoint.Stop()
}
}
// MergeTemplate merge with template
func (this *WAF) MergeTemplate() (changedItems []string) {
changedItems = []string{}
// compare versions
if !Tea.IsTesting() && this.CreatedVersion == teaconst.Version {
return
}
this.CreatedVersion = teaconst.Version
template := Template()
groups := []*RuleGroup{}
groups = append(groups, template.Inbound...)
groups = append(groups, template.Outbound...)
var newGroupId int64 = 1_000_000_000
for _, group := range groups {
oldGroup := this.FindRuleGroupWithCode(group.Code)
if oldGroup == nil {
newGroupId++
group.Id = newGroupId
this.AddRuleGroup(group)
changedItems = append(changedItems, "+group "+group.Name)
continue
}
// check rule sets
for _, set := range group.RuleSets {
oldSet := oldGroup.FindRuleSetWithCode(set.Code)
if oldSet == nil {
oldGroup.AddRuleSet(set)
changedItems = append(changedItems, "+group "+group.Name+" rule set:"+set.Name)
} else if len(oldSet.Rules) < len(set.Rules) {
oldSet.Rules = set.Rules
changedItems = append(changedItems, "*group "+group.Name+" rule set:"+set.Name)
}
}
}
return
}