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main.go
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// Copyright (c) 2022 Alibaba Group Holding Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"errors"
"fmt"
"strings"
"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
"github.com/tidwall/gjson"
regexp "github.com/wasilibs/go-re2"
"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
)
func main() {
wrapper.SetCtx(
"request-block",
wrapper.ParseConfigBy(parseConfig),
wrapper.ProcessRequestHeadersBy(onHttpRequestHeaders),
wrapper.ProcessRequestBodyBy(onHttpRequestBody),
)
}
type RequestBlockConfig struct {
blockedCode uint32
blockedMessage string
caseSensitive bool
blockUrls []string
blockExactUrls []string
blockHeaders []string
blockBodies []string
blockRegExpArray []*regexp.Regexp
}
func parseConfig(json gjson.Result, config *RequestBlockConfig, log wrapper.Log) error {
code := json.Get("blocked_code").Int()
if code != 0 && code > 100 && code < 600 {
config.blockedCode = uint32(code)
} else {
config.blockedCode = 403
}
config.blockedMessage = json.Get("blocked_message").String()
config.caseSensitive = json.Get("case_sensitive").Bool()
for _, item := range json.Get("block_urls").Array() {
url := item.String()
if url == "" {
continue
}
if config.caseSensitive {
config.blockUrls = append(config.blockUrls, url)
} else {
config.blockUrls = append(config.blockUrls, strings.ToLower(url))
}
}
for _, item := range json.Get("block_exact_urls").Array() {
url := item.String()
if url == "" {
continue
}
if config.caseSensitive {
config.blockExactUrls = append(config.blockExactUrls, url)
} else {
config.blockExactUrls = append(config.blockExactUrls, strings.ToLower(url))
}
}
for _, item := range json.Get("block_regexp_urls").Array() {
regexpUrl := item.String()
if regexpUrl == "" {
continue
}
if config.caseSensitive {
reg := regexp.MustCompile(regexpUrl)
config.blockRegExpArray = append(config.blockRegExpArray, reg)
} else {
reg := regexp.MustCompile(strings.ToLower(regexpUrl))
config.blockRegExpArray = append(config.blockRegExpArray, reg)
}
}
for _, item := range json.Get("block_headers").Array() {
header := item.String()
if header == "" {
continue
}
if config.caseSensitive {
config.blockHeaders = append(config.blockHeaders, header)
} else {
config.blockHeaders = append(config.blockHeaders, strings.ToLower(header))
}
}
for _, item := range json.Get("block_bodies").Array() {
body := item.String()
if body == "" {
continue
}
if config.caseSensitive {
config.blockBodies = append(config.blockBodies, body)
} else {
config.blockBodies = append(config.blockBodies, strings.ToLower(body))
}
}
if len(config.blockUrls) == 0 && len(config.blockHeaders) == 0 &&
len(config.blockBodies) == 0 {
return errors.New("there is no block rules")
}
return nil
}
func onHttpRequestHeaders(ctx wrapper.HttpContext, config RequestBlockConfig, log wrapper.Log) types.Action {
if len(config.blockUrls) > 0 {
requestUrl, err := proxywasm.GetHttpRequestHeader(":path")
if err != nil {
log.Warnf("get path failed: %v", err)
return types.ActionContinue
}
if !config.caseSensitive {
requestUrl = strings.ToLower(requestUrl)
}
for _, blockExactUrl := range config.blockExactUrls {
if requestUrl == blockExactUrl {
proxywasm.SendHttpResponseWithDetail(config.blockedCode, "request-block.url_blocked.exact", nil, []byte(config.blockedMessage), -1)
return types.ActionContinue
}
}
for _, blockUrl := range config.blockUrls {
if strings.Contains(requestUrl, blockUrl) {
proxywasm.SendHttpResponseWithDetail(config.blockedCode, "request-block.url_blocked.keyword", nil, []byte(config.blockedMessage), -1)
return types.ActionContinue
}
}
for _, regExpObj := range config.blockRegExpArray {
if regExpObj.MatchString(requestUrl) {
proxywasm.SendHttpResponseWithDetail(config.blockedCode, "request-block.url_blocked.regexp", nil, []byte(config.blockedMessage), -1)
return types.ActionContinue
}
}
}
if len(config.blockHeaders) > 0 {
headers, err := proxywasm.GetHttpRequestHeaders()
if err != nil {
log.Warnf("get headers failed: %v", err)
return types.ActionContinue
}
var headerPairs []string
for _, kv := range headers {
headerPairs = append(headerPairs, fmt.Sprintf("%s\n%s", kv[0], kv[1]))
}
headerStr := strings.Join(headerPairs, "\n")
if !config.caseSensitive {
headerStr = strings.ToLower(headerStr)
}
for _, blockHeader := range config.blockHeaders {
if strings.Contains(headerStr, blockHeader) {
proxywasm.SendHttpResponseWithDetail(config.blockedCode, "request-block.body_blocked", nil, []byte(config.blockedMessage), -1)
return types.ActionContinue
}
}
}
if len(config.blockBodies) == 0 {
ctx.DontReadRequestBody()
}
return types.ActionContinue
}
func onHttpRequestBody(ctx wrapper.HttpContext, config RequestBlockConfig, body []byte, log wrapper.Log) types.Action {
log.Infof("My request-block body: %s\n", string(body))
bodyStr := string(body)
if !config.caseSensitive {
bodyStr = strings.ToLower(bodyStr)
}
for _, blockBody := range config.blockBodies {
if strings.Contains(bodyStr, blockBody) {
proxywasm.SendHttpResponseWithDetail(config.blockedCode, "request-block.body_blocked", nil, []byte(config.blockedMessage), -1)
return types.ActionContinue
}
}
return types.ActionContinue
}