mirror of
https://github.com/alibaba/higress.git
synced 2026-03-03 08:00:49 +08:00
481 lines
16 KiB
Go
481 lines
16 KiB
Go
package main
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import (
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"bytes"
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha1"
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"encoding/base64"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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mrand "math/rand"
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"net/http"
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"net/url"
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"sort"
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"strings"
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"time"
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"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
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"github.com/tidwall/gjson"
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)
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func main() {
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wrapper.SetCtx(
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"ai-security-guard",
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wrapper.ParseConfigBy(parseConfig),
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wrapper.ProcessRequestHeadersBy(onHttpRequestHeaders),
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wrapper.ProcessRequestBodyBy(onHttpRequestBody),
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wrapper.ProcessResponseHeadersBy(onHttpResponseHeaders),
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wrapper.ProcessResponseBodyBy(onHttpResponseBody),
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)
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}
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const (
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MaxRisk = "max"
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HighRisk = "high"
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MediumRisk = "medium"
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LowRisk = "low"
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NoRisk = "none"
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OpenAIResponseFormat = `{"id": "%s","object":"chat.completion","model":"%s","choices":[{"index":0,"message":{"role":"assistant","content":"%s"},"logprobs":null,"finish_reason":"stop"}]}`
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OpenAIStreamResponseChunk = `data:{"id":"%s","object":"chat.completion.chunk","model":"%s","choices":[{"index":0,"delta":{"role":"assistant","content":"%s"},"logprobs":null,"finish_reason":null}]}`
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OpenAIStreamResponseEnd = `data:{"id":"%s","object":"chat.completion.chunk","model":"%s","choices":[{"index":0,"delta":{},"logprobs":null,"finish_reason":"stop"}]}`
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OpenAIStreamResponseFormat = OpenAIStreamResponseChunk + "\n\n" + OpenAIStreamResponseEnd + "\n\n" + `data: [DONE]`
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DefaultRequestCheckService = "llm_query_moderation"
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DefaultResponseCheckService = "llm_response_moderation"
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DefaultRequestJsonPath = "messages.@reverse.0.content"
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DefaultResponseJsonPath = "choices.0.message.content"
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DefaultStreamingResponseJsonPath = "choices.0.delta.content"
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DefaultDenyCode = 200
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DefaultDenyMessage = "很抱歉，我无法回答您的问题"
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AliyunUserAgent = "CIPFrom/AIGateway"
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)
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type Response struct {
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Code int `json:"Code"`
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Message string `json:"Message"`
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RequestId string `json:"RequestId"`
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Data Data `json:"Data"`
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}
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type Data struct {
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RiskLevel string `json:"RiskLevel"`
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Result []Result `json:"Result,omitempty"`
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Advice []Advice `json:"Advice,omitempty"`
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}
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type Result struct {
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RiskWords string `json:"RiskWords,omitempty"`
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Description string `json:"Description,omitempty"`
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Confidence float64 `json:"Confidence,omitempty"`
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Label string `json:"Label,omitempty"`
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}
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type Advice struct {
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Answer string `json:"Answer,omitempty"`
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HitLabel string `json:"HitLabel,omitempty"`
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HitLibName string `json:"HitLibName,omitempty"`
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}
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type AISecurityConfig struct {
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client wrapper.HttpClient
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ak string
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sk string
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token string
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checkRequest bool
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requestCheckService string
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requestContentJsonPath string
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checkResponse bool
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responseCheckService string
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responseContentJsonPath string
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responseStreamContentJsonPath string
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denyCode int64
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denyMessage string
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protocolOriginal bool
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riskLevelBar string
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metrics map[string]proxywasm.MetricCounter
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}
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func (config *AISecurityConfig) incrementCounter(metricName string, inc uint64) {
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counter, ok := config.metrics[metricName]
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if !ok {
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counter = proxywasm.DefineCounterMetric(metricName)
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config.metrics[metricName] = counter
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}
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counter.Increment(inc)
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}
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func riskLevelToInt(riskLevel string) int {
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switch riskLevel {
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case MaxRisk:
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return 4
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case HighRisk:
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return 3
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case MediumRisk:
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return 2
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case LowRisk:
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return 1
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case NoRisk:
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return 0
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default:
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return -1
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}
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}
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func urlEncoding(rawStr string) string {
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encodedStr := url.PathEscape(rawStr)
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encodedStr = strings.ReplaceAll(encodedStr, "+", "%2B")
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encodedStr = strings.ReplaceAll(encodedStr, ":", "%3A")
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encodedStr = strings.ReplaceAll(encodedStr, "=", "%3D")
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encodedStr = strings.ReplaceAll(encodedStr, "&", "%26")
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encodedStr = strings.ReplaceAll(encodedStr, "$", "%24")
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encodedStr = strings.ReplaceAll(encodedStr, "@", "%40")
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return encodedStr
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}
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func hmacSha1(message, secret string) string {
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key := []byte(secret)
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h := hmac.New(sha1.New, key)
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h.Write([]byte(message))
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hash := h.Sum(nil)
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return base64.StdEncoding.EncodeToString(hash)
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}
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func getSign(params map[string]string, secret string) string {
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paramArray := []string{}
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for k, v := range params {
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paramArray = append(paramArray, urlEncoding(k)+"="+urlEncoding(v))
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}
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sort.Slice(paramArray, func(i, j int) bool {
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return paramArray[i] <= paramArray[j]
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})
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canonicalStr := strings.Join(paramArray, "&")
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signStr := "POST&%2F&" + urlEncoding(canonicalStr)
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proxywasm.LogDebugf("String to sign is: %s", signStr)
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return hmacSha1(signStr, secret)
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}
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func generateHexID(length int) (string, error) {
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bytes := make([]byte, length/2)
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if _, err := rand.Read(bytes); err != nil {
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return "", err
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}
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return hex.EncodeToString(bytes), nil
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}
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func parseConfig(json gjson.Result, config *AISecurityConfig, log wrapper.Log) error {
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serviceName := json.Get("serviceName").String()
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servicePort := json.Get("servicePort").Int()
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serviceHost := json.Get("serviceHost").String()
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if serviceName == "" || servicePort == 0 || serviceHost == "" {
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return errors.New("invalid service config")
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}
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config.ak = json.Get("accessKey").String()
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config.sk = json.Get("secretKey").String()
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if config.ak == "" || config.sk == "" {
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return errors.New("invalid AK/SK config")
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}
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config.token = json.Get("securityToken").String()
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config.checkRequest = json.Get("checkRequest").Bool()
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config.checkResponse = json.Get("checkResponse").Bool()
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config.protocolOriginal = json.Get("protocol").String() == "original"
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config.denyMessage = json.Get("denyMessage").String()
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if obj := json.Get("denyCode"); obj.Exists() {
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config.denyCode = obj.Int()
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} else {
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config.denyCode = DefaultDenyCode
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}
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if obj := json.Get("requestCheckService"); obj.Exists() {
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config.requestCheckService = obj.String()
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} else {
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config.requestCheckService = DefaultRequestCheckService
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}
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if obj := json.Get("responseCheckService"); obj.Exists() {
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config.responseCheckService = obj.String()
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} else {
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config.responseCheckService = DefaultResponseCheckService
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}
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if obj := json.Get("requestContentJsonPath"); obj.Exists() {
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config.requestContentJsonPath = obj.String()
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} else {
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config.requestContentJsonPath = DefaultRequestJsonPath
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}
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if obj := json.Get("responseContentJsonPath"); obj.Exists() {
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config.responseContentJsonPath = obj.String()
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} else {
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config.responseContentJsonPath = DefaultResponseJsonPath
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}
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if obj := json.Get("responseStreamContentJsonPath"); obj.Exists() {
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config.responseStreamContentJsonPath = obj.String()
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} else {
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config.responseStreamContentJsonPath = DefaultStreamingResponseJsonPath
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}
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if obj := json.Get("riskLevelBar"); obj.Exists() {
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config.riskLevelBar = obj.String()
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if riskLevelToInt(config.riskLevelBar) <= 0 {
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return errors.New("invalid risk level, value must be one of [max, high, medium, low]")
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}
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} else {
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config.riskLevelBar = HighRisk
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}
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config.client = wrapper.NewClusterClient(wrapper.FQDNCluster{
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FQDN: serviceName,
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Port: servicePort,
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Host: serviceHost,
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})
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config.metrics = make(map[string]proxywasm.MetricCounter)
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return nil
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}
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func generateRandomID() string {
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const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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b := make([]byte, 29)
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for i := range b {
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b[i] = charset[mrand.Intn(len(charset))]
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}
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return "chatcmpl-" + string(b)
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}
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func onHttpRequestHeaders(ctx wrapper.HttpContext, config AISecurityConfig, log wrapper.Log) types.Action {
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if !config.checkRequest {
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log.Debugf("request checking is disabled")
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ctx.DontReadRequestBody()
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}
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return types.ActionContinue
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}
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func onHttpRequestBody(ctx wrapper.HttpContext, config AISecurityConfig, body []byte, log wrapper.Log) types.Action {
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log.Debugf("checking request body...")
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content := gjson.GetBytes(body, config.requestContentJsonPath).String()
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model := gjson.GetBytes(body, "model").String()
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ctx.SetContext("requestModel", model)
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log.Debugf("Raw request content is: %s", content)
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if len(content) == 0 {
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log.Info("request content is empty. skip")
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return types.ActionContinue
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}
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timestamp := time.Now().UTC().Format("2006-01-02T15:04:05Z")
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randomID, _ := generateHexID(16)
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params := map[string]string{
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"Format": "JSON",
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"Version": "2022-03-02",
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"SignatureMethod": "Hmac-SHA1",
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"SignatureNonce": randomID,
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"SignatureVersion": "1.0",
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"Action": "TextModerationPlus",
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"AccessKeyId": config.ak,
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"Timestamp": timestamp,
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"Service": config.requestCheckService,
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"ServiceParameters": fmt.Sprintf(`{"content": "%s"}`, marshalStr(content, log)),
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}
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if config.token != "" {
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params["SecurityToken"] = config.token
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}
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signature := getSign(params, config.sk+"&")
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reqParams := url.Values{}
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for k, v := range params {
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reqParams.Add(k, v)
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}
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reqParams.Add("Signature", signature)
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err := config.client.Post(fmt.Sprintf("/?%s", reqParams.Encode()), [][2]string{{"User-Agent", AliyunUserAgent}}, nil,
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func(statusCode int, responseHeaders http.Header, responseBody []byte) {
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log.Info(string(responseBody))
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if statusCode != 200 || gjson.GetBytes(responseBody, "Code").Int() != 200 {
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proxywasm.ResumeHttpRequest()
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return
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}
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var response Response
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err := json.Unmarshal(responseBody, &response)
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if err != nil {
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log.Error("failed to unmarshal aliyun content security response at request phase")
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proxywasm.ResumeHttpRequest()
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return
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}
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if riskLevelToInt(response.Data.RiskLevel) < riskLevelToInt(config.riskLevelBar) {
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proxywasm.ResumeHttpRequest()
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return
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}
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denyMessage := DefaultDenyMessage
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if config.denyMessage != "" {
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denyMessage = config.denyMessage
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} else if response.Data.Advice != nil && response.Data.Advice[0].Answer != "" {
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denyMessage = response.Data.Advice[0].Answer
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}
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marshalledDenyMessage := marshalStr(denyMessage, log)
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if config.protocolOriginal {
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proxywasm.SendHttpResponse(uint32(config.denyCode), [][2]string{{"content-type", "application/json"}}, []byte(marshalledDenyMessage), -1)
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} else if gjson.GetBytes(body, "stream").Bool() {
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randomID := generateRandomID()
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jsonData := []byte(fmt.Sprintf(OpenAIStreamResponseFormat, randomID, model, marshalledDenyMessage, randomID, model))
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proxywasm.SendHttpResponse(uint32(config.denyCode), [][2]string{{"content-type", "text/event-stream;charset=UTF-8"}}, jsonData, -1)
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} else {
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randomID := generateRandomID()
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jsonData := []byte(fmt.Sprintf(OpenAIResponseFormat, randomID, model, marshalledDenyMessage))
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proxywasm.SendHttpResponse(uint32(config.denyCode), [][2]string{{"content-type", "application/json"}}, jsonData, -1)
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}
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ctx.DontReadResponseBody()
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config.incrementCounter("ai_sec_request_deny", 1)
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},
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)
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if err != nil {
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log.Errorf("failed call the safe check service: %v", err)
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return types.ActionContinue
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}
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return types.ActionPause
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}
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func convertHeaders(hs [][2]string) map[string][]string {
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ret := make(map[string][]string)
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for _, h := range hs {
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k, v := strings.ToLower(h[0]), h[1]
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ret[k] = append(ret[k], v)
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}
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return ret
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}
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// headers: map[string][]string -> [][2]string
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func reconvertHeaders(hs map[string][]string) [][2]string {
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var ret [][2]string
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for k, vs := range hs {
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for _, v := range vs {
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ret = append(ret, [2]string{k, v})
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}
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}
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sort.SliceStable(ret, func(i, j int) bool {
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return ret[i][0] < ret[j][0]
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})
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return ret
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}
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func onHttpResponseHeaders(ctx wrapper.HttpContext, config AISecurityConfig, log wrapper.Log) types.Action {
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if !config.checkResponse {
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log.Debugf("response checking is disabled")
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ctx.DontReadResponseBody()
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return types.ActionContinue
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}
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headers, err := proxywasm.GetHttpResponseHeaders()
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if err != nil {
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log.Warnf("failed to get response headers: %v", err)
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return types.ActionContinue
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}
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hdsMap := convertHeaders(headers)
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ctx.SetContext("headers", hdsMap)
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return types.HeaderStopIteration
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}
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func onHttpResponseBody(ctx wrapper.HttpContext, config AISecurityConfig, body []byte, log wrapper.Log) types.Action {
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log.Debugf("checking response body...")
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hdsMap := ctx.GetContext("headers").(map[string][]string)
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isStreamingResponse := strings.Contains(strings.Join(hdsMap["content-type"], ";"), "event-stream")
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model := ctx.GetStringContext("requestModel", "unknown")
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var content string
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if isStreamingResponse {
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content = extractMessageFromStreamingBody(body, config.responseStreamContentJsonPath)
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} else {
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content = gjson.GetBytes(body, config.responseContentJsonPath).String()
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}
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log.Debugf("Raw response content is: %s", content)
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if len(content) == 0 {
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log.Info("response content is empty. skip")
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return types.ActionContinue
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}
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timestamp := time.Now().UTC().Format("2006-01-02T15:04:05Z")
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randomID, _ := generateHexID(16)
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params := map[string]string{
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"Format": "JSON",
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"Version": "2022-03-02",
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"SignatureMethod": "Hmac-SHA1",
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"SignatureNonce": randomID,
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"SignatureVersion": "1.0",
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"Action": "TextModerationPlus",
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"AccessKeyId": config.ak,
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"Timestamp": timestamp,
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"Service": config.responseCheckService,
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"ServiceParameters": fmt.Sprintf(`{"content": "%s"}`, marshalStr(content, log)),
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}
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if config.token != "" {
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params["SecurityToken"] = config.token
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}
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signature := getSign(params, config.sk+"&")
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reqParams := url.Values{}
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for k, v := range params {
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reqParams.Add(k, v)
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}
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reqParams.Add("Signature", signature)
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err := config.client.Post(fmt.Sprintf("/?%s", reqParams.Encode()), [][2]string{{"User-Agent", AliyunUserAgent}}, nil,
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func(statusCode int, responseHeaders http.Header, responseBody []byte) {
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defer proxywasm.ResumeHttpResponse()
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log.Info(string(responseBody))
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if statusCode != 200 || gjson.GetBytes(responseBody, "Code").Int() != 200 {
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return
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}
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var response Response
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err := json.Unmarshal(responseBody, &response)
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if err != nil {
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log.Error("failed to unmarshal aliyun content security response at response phase")
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return
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}
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if riskLevelToInt(response.Data.RiskLevel) < riskLevelToInt(config.riskLevelBar) {
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return
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}
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denyMessage := DefaultDenyMessage
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if config.denyMessage != "" {
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denyMessage = config.denyMessage
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} else if response.Data.Advice != nil && response.Data.Advice[0].Answer != "" {
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denyMessage = response.Data.Advice[0].Answer
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}
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marshalledDenyMessage := marshalStr(denyMessage, log)
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var jsonData []byte
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if config.protocolOriginal {
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jsonData = []byte(marshalledDenyMessage)
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} else if isStreamingResponse {
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randomID := generateRandomID()
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jsonData = []byte(fmt.Sprintf(OpenAIStreamResponseFormat, randomID, model, marshalledDenyMessage, randomID, model))
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} else {
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randomID := generateRandomID()
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jsonData = []byte(fmt.Sprintf(OpenAIResponseFormat, randomID, model, marshalledDenyMessage))
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}
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delete(hdsMap, "content-length")
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hdsMap[":status"] = []string{fmt.Sprint(config.denyCode)}
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proxywasm.ReplaceHttpResponseHeaders(reconvertHeaders(hdsMap))
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proxywasm.ReplaceHttpResponseBody(jsonData)
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config.incrementCounter("ai_sec_response_deny", 1)
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},
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)
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if err != nil {
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log.Errorf("failed call the safe check service: %v", err)
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return types.ActionContinue
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}
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return types.ActionPause
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}
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func extractMessageFromStreamingBody(data []byte, jsonPath string) string {
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chunks := bytes.Split(bytes.TrimSpace(data), []byte("\n\n"))
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strChunks := []string{}
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for _, chunk := range chunks {
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// Example: "choices":[{"index":0,"delta":{"role":"assistant","content":"%s"},"logprobs":null,"finish_reason":null}]
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strChunks = append(strChunks, gjson.GetBytes(chunk, jsonPath).String())
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}
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return strings.Join(strChunks, "")
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}
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func marshalStr(raw string, log wrapper.Log) string {
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helper := map[string]string{
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"placeholder": raw,
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}
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marshalledHelper, _ := json.Marshal(helper)
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marshalledRaw := gjson.GetBytes(marshalledHelper, "placeholder").Raw
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if len(marshalledRaw) >= 2 {
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return marshalledRaw[1 : len(marshalledRaw)-1]
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} else {
|
|
log.Errorf("failed to marshal json string, raw string is: %s", raw)
|
|
return ""
|
|
}
|
|
}
|