mirror of
https://github.com/alibaba/higress.git
synced 2026-03-14 05:40:47 +08:00
784 lines
27 KiB
Go
784 lines
27 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/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/higress-group/wasm-go/pkg/log"
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"github.com/higress-group/wasm-go/pkg/wrapper"
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"github.com/tidwall/gjson"
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)
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func main() {}
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func init() {
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wrapper.SetCtx(
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"ai-security-guard",
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wrapper.ParseConfig(parseConfig),
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wrapper.ProcessRequestHeaders(onHttpRequestHeaders),
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wrapper.ProcessRequestBody(onHttpRequestBody),
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wrapper.ProcessResponseHeaders(onHttpResponseHeaders),
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wrapper.ProcessStreamingResponseBody(onHttpStreamingResponseBody),
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wrapper.ProcessResponseBody(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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S4Sensitive = "S4"
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S3Sensitive = "S3"
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S2Sensitive = "S2"
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S1Sensitive = "S1"
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NoSensitive = "S0"
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ContentModerationType = "contentModeration"
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PromptAttackType = "promptAttack"
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SensitiveDataType = "sensitiveData"
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OpenAIResponseFormat = `{"id": "%s","object":"chat.completion","model":"from-security-guard","choices":[{"index":0,"message":{"role":"assistant","content":"%s"},"logprobs":null,"finish_reason":"stop"}],"usage":{"prompt_tokens":0,"completion_tokens":0,"total_tokens":0}}`
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OpenAIStreamResponseChunk = `data:{"id":"%s","object":"chat.completion.chunk","model":"from-security-guard","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":"from-security-guard","choices":[{"index":0,"delta":{},"logprobs":null,"finish_reason":"stop"}],"usage":{"prompt_tokens":0,"completion_tokens":0,"total_tokens":0}}`
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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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DefaultTimeout = 2000
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AliyunUserAgent = "CIPFrom/AIGateway"
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LengthLimit = 1800
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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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AttackLevel string `json:"AttackLevel,omitempty"`
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Result []Result `json:"Result,omitempty"`
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Advice []Advice `json:"Advice,omitempty"`
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Detail []Detail `json:"Detail,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 Detail struct {
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Suggestion string `json:"Suggestion,omitempty"`
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Type string `json:"Type,omitempty"`
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Level string `json:"Level,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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action 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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contentModerationLevelBar string
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promptAttackLevelBar string
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sensitiveDataLevelBar string
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timeout uint32
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bufferLimit int
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metrics map[string]proxywasm.MetricCounter
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consumerSpecificRequestCheckService map[string]string
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consumerSpecificResponseCheckService map[string]string
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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 levelToInt(riskLevel string) int {
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// First check against our defined constants
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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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case S4Sensitive:
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return 4
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case S3Sensitive:
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return 3
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case S2Sensitive:
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return 2
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case S1Sensitive:
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return 1
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case NoSensitive:
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return 0
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}
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// Then check against raw string values
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switch riskLevel {
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case "max", "MAX":
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return 4
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case "high", "HIGH":
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return 3
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case "medium", "MEDIUM":
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return 2
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case "low", "LOW":
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return 1
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case "none", "NONE":
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return 0
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case "S4", "s4":
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return 4
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case "S3", "s3":
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return 3
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case "S2", "s2":
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return 2
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case "S1", "s1":
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return 1
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case "S0", "s0":
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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 isRiskLevelAcceptable(action string, data Data, config AISecurityConfig) bool {
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if action == "MultiModalGuard" {
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// Check top-level risk levels for MultiModalGuard
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if levelToInt(data.RiskLevel) >= levelToInt(config.contentModerationLevelBar) {
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return false
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}
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// Also check AttackLevel for prompt attack detection
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if levelToInt(data.AttackLevel) >= levelToInt(config.promptAttackLevelBar) {
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return false
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}
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// Check detailed results for backward compatibility
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for _, detail := range data.Detail {
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switch detail.Type {
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case ContentModerationType:
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if levelToInt(detail.Level) >= levelToInt(config.contentModerationLevelBar) {
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return false
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}
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case PromptAttackType:
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if levelToInt(detail.Level) >= levelToInt(config.promptAttackLevelBar) {
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return false
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}
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case SensitiveDataType:
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if levelToInt(detail.Level) >= levelToInt(config.sensitiveDataLevelBar) {
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return false
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}
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}
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}
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return true
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} else {
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return levelToInt(data.RiskLevel) < levelToInt(config.contentModerationLevelBar)
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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) 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.action = json.Get("action").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("contentModerationLevelBar"); obj.Exists() {
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config.contentModerationLevelBar = obj.String()
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if levelToInt(config.contentModerationLevelBar) <= 0 {
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return errors.New("invalid contentModerationLevelBar, value must be one of [max, high, medium, low]")
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}
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} else {
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config.contentModerationLevelBar = MaxRisk
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}
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if obj := json.Get("promptAttackLevelBar"); obj.Exists() {
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config.promptAttackLevelBar = obj.String()
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if levelToInt(config.promptAttackLevelBar) <= 0 {
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return errors.New("invalid promptAttackLevelBar, value must be one of [max, high, medium, low]")
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}
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} else {
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config.promptAttackLevelBar = MaxRisk
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}
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if obj := json.Get("sensitiveDataLevelBar"); obj.Exists() {
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config.sensitiveDataLevelBar = obj.String()
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if levelToInt(config.sensitiveDataLevelBar) <= 0 {
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return errors.New("invalid sensitiveDataLevelBar, value must be one of [S4, S3, S2, S1]")
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}
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} else {
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config.sensitiveDataLevelBar = S4Sensitive
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}
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if obj := json.Get("timeout"); obj.Exists() {
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config.timeout = uint32(obj.Int())
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} else {
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config.timeout = DefaultTimeout
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}
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if obj := json.Get("bufferLimit"); obj.Exists() {
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config.bufferLimit = int(obj.Int())
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} else {
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config.bufferLimit = 1000
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}
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config.consumerSpecificRequestCheckService = make(map[string]string)
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for k, v := range json.Get("consumerSpecificRequestCheckService").Map() {
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config.consumerSpecificRequestCheckService[k] = v.String()
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}
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config.consumerSpecificResponseCheckService = make(map[string]string)
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for k, v := range json.Get("consumerSpecificResponseCheckService").Map() {
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config.consumerSpecificResponseCheckService[k] = v.String()
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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) types.Action {
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consumer, _ := proxywasm.GetHttpRequestHeader("x-mse-consumer")
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ctx.SetContext("consumer", consumer)
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ctx.DisableReroute()
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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) types.Action {
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log.Debugf("checking request body...")
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startTime := time.Now().UnixMilli()
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content := gjson.GetBytes(body, config.requestContentJsonPath).String()
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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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contentIndex := 0
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sessionID, _ := generateHexID(20)
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var singleCall func()
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callback := 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 isRiskLevelAcceptable(config.action, response.Data, config) {
|
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if contentIndex >= len(content) {
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endTime := time.Now().UnixMilli()
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ctx.SetUserAttribute("safecheck_request_rt", endTime-startTime)
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ctx.SetUserAttribute("safecheck_status", "request pass")
|
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ctx.WriteUserAttributeToLogWithKey(wrapper.AILogKey)
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proxywasm.ResumeHttpRequest()
|
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} else {
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singleCall()
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}
|
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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)
|
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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, marshalledDenyMessage, randomID))
|
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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, 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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endTime := time.Now().UnixMilli()
|
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ctx.SetUserAttribute("safecheck_request_rt", endTime-startTime)
|
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ctx.SetUserAttribute("safecheck_status", "reqeust deny")
|
|
if response.Data.Advice != nil {
|
|
ctx.SetUserAttribute("safecheck_riskLabel", response.Data.Result[0].Label)
|
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ctx.SetUserAttribute("safecheck_riskWords", response.Data.Result[0].RiskWords)
|
|
}
|
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ctx.WriteUserAttributeToLogWithKey(wrapper.AILogKey)
|
|
}
|
|
singleCall = func() {
|
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timestamp := time.Now().UTC().Format("2006-01-02T15:04:05Z")
|
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randomID, _ := generateHexID(16)
|
|
var nextContentIndex int
|
|
if contentIndex+LengthLimit >= len(content) {
|
|
nextContentIndex = len(content)
|
|
} else {
|
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nextContentIndex = contentIndex + LengthLimit
|
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}
|
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contentPiece := content[contentIndex:nextContentIndex]
|
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contentIndex = nextContentIndex
|
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log.Debugf("current content piece: %s", contentPiece)
|
|
consumer, _ := ctx.GetContext("consumer").(string)
|
|
checkService, ok := config.consumerSpecificRequestCheckService[consumer]
|
|
if !ok {
|
|
checkService = config.requestCheckService
|
|
}
|
|
params := map[string]string{
|
|
"Format": "JSON",
|
|
"Version": "2022-03-02",
|
|
"SignatureMethod": "Hmac-SHA1",
|
|
"SignatureNonce": randomID,
|
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"SignatureVersion": "1.0",
|
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"Action": config.action,
|
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"AccessKeyId": config.ak,
|
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"Timestamp": timestamp,
|
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"Service": checkService,
|
|
"ServiceParameters": fmt.Sprintf(`{"sessionId": "%s","content": "%s","requestFrom": "%s"}`, sessionID, marshalStr(contentPiece), AliyunUserAgent),
|
|
}
|
|
if config.token != "" {
|
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params["SecurityToken"] = config.token
|
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}
|
|
signature := getSign(params, config.sk+"&")
|
|
reqParams := url.Values{}
|
|
for k, v := range params {
|
|
reqParams.Add(k, v)
|
|
}
|
|
reqParams.Add("Signature", signature)
|
|
err := config.client.Post(fmt.Sprintf("/?%s", reqParams.Encode()), [][2]string{{"User-Agent", AliyunUserAgent}}, nil, callback, config.timeout)
|
|
if err != nil {
|
|
log.Errorf("failed call the safe check service: %v", err)
|
|
proxywasm.ResumeHttpRequest()
|
|
}
|
|
}
|
|
singleCall()
|
|
return types.ActionPause
|
|
}
|
|
|
|
func onHttpResponseHeaders(ctx wrapper.HttpContext, config AISecurityConfig) types.Action {
|
|
if !config.checkResponse {
|
|
log.Debugf("response checking is disabled")
|
|
ctx.DontReadResponseBody()
|
|
return types.ActionContinue
|
|
}
|
|
statusCode, _ := proxywasm.GetHttpResponseHeader(":status")
|
|
if statusCode != "200" {
|
|
log.Debugf("response is not 200, skip response body check")
|
|
ctx.DontReadResponseBody()
|
|
return types.ActionContinue
|
|
}
|
|
contentType, _ := proxywasm.GetHttpResponseHeader("content-type")
|
|
ctx.SetContext("end_of_stream_received", false)
|
|
ctx.SetContext("during_call", false)
|
|
ctx.SetContext("risk_detected", false)
|
|
sessionID, _ := generateHexID(20)
|
|
ctx.SetContext("sessionID", sessionID)
|
|
if strings.Contains(contentType, "text/event-stream") {
|
|
ctx.NeedPauseStreamingResponse()
|
|
return types.ActionContinue
|
|
} else {
|
|
ctx.BufferResponseBody()
|
|
return types.HeaderStopIteration
|
|
}
|
|
}
|
|
|
|
func onHttpStreamingResponseBody(ctx wrapper.HttpContext, config AISecurityConfig, data []byte, endOfStream bool) []byte {
|
|
var bufferQueue [][]byte
|
|
var singleCall func()
|
|
callback := func(statusCode int, responseHeaders http.Header, responseBody []byte) {
|
|
log.Info(string(responseBody))
|
|
if statusCode != 200 || gjson.GetBytes(responseBody, "Code").Int() != 200 {
|
|
if ctx.GetContext("end_of_stream_received").(bool) {
|
|
proxywasm.ResumeHttpResponse()
|
|
}
|
|
ctx.SetContext("during_call", false)
|
|
return
|
|
}
|
|
var response Response
|
|
err := json.Unmarshal(responseBody, &response)
|
|
if err != nil {
|
|
log.Error("failed to unmarshal aliyun content security response at response phase")
|
|
if ctx.GetContext("end_of_stream_received").(bool) {
|
|
proxywasm.ResumeHttpResponse()
|
|
}
|
|
ctx.SetContext("during_call", false)
|
|
return
|
|
}
|
|
if !isRiskLevelAcceptable(config.action, response.Data, config) {
|
|
denyMessage := DefaultDenyMessage
|
|
if response.Data.Advice != nil && response.Data.Advice[0].Answer != "" {
|
|
denyMessage = "\n" + response.Data.Advice[0].Answer
|
|
} else if config.denyMessage != "" {
|
|
denyMessage = config.denyMessage
|
|
}
|
|
marshalledDenyMessage := marshalStr(denyMessage)
|
|
randomID := generateRandomID()
|
|
jsonData := []byte(fmt.Sprintf(OpenAIStreamResponseFormat, randomID, marshalledDenyMessage, randomID))
|
|
proxywasm.InjectEncodedDataToFilterChain(jsonData, true)
|
|
return
|
|
}
|
|
endStream := ctx.GetContext("end_of_stream_received").(bool) && ctx.BufferQueueSize() == 0
|
|
proxywasm.InjectEncodedDataToFilterChain(bytes.Join(bufferQueue, []byte("")), endStream)
|
|
bufferQueue = [][]byte{}
|
|
if !endStream {
|
|
ctx.SetContext("during_call", false)
|
|
singleCall()
|
|
}
|
|
}
|
|
singleCall = func() {
|
|
if ctx.GetContext("during_call").(bool) {
|
|
return
|
|
}
|
|
if ctx.BufferQueueSize() >= config.bufferLimit || ctx.GetContext("end_of_stream_received").(bool) {
|
|
ctx.SetContext("during_call", true)
|
|
var buffer string
|
|
for ctx.BufferQueueSize() > 0 {
|
|
front := ctx.PopBuffer()
|
|
bufferQueue = append(bufferQueue, front)
|
|
msg := gjson.GetBytes(front, config.responseStreamContentJsonPath).String()
|
|
buffer += msg
|
|
if len([]rune(buffer)) >= config.bufferLimit {
|
|
break
|
|
}
|
|
}
|
|
timestamp := time.Now().UTC().Format("2006-01-02T15:04:05Z")
|
|
randomID, _ := generateHexID(16)
|
|
log.Debugf("current content piece: %s", buffer)
|
|
consumer, _ := ctx.GetContext("consumer").(string)
|
|
checkService, ok := config.consumerSpecificResponseCheckService[consumer]
|
|
if !ok {
|
|
checkService = config.responseCheckService
|
|
}
|
|
params := map[string]string{
|
|
"Format": "JSON",
|
|
"Version": "2022-03-02",
|
|
"SignatureMethod": "Hmac-SHA1",
|
|
"SignatureNonce": randomID,
|
|
"SignatureVersion": "1.0",
|
|
"Action": config.action,
|
|
"AccessKeyId": config.ak,
|
|
"Timestamp": timestamp,
|
|
"Service": checkService,
|
|
"ServiceParameters": fmt.Sprintf(`{"sessionId": "%s","content": "%s","requestFrom": "%s"}`, ctx.GetContext("sessionID").(string), marshalStr(buffer), AliyunUserAgent),
|
|
}
|
|
if config.token != "" {
|
|
params["SecurityToken"] = config.token
|
|
}
|
|
signature := getSign(params, config.sk+"&")
|
|
reqParams := url.Values{}
|
|
for k, v := range params {
|
|
reqParams.Add(k, v)
|
|
}
|
|
reqParams.Add("Signature", signature)
|
|
err := config.client.Post(fmt.Sprintf("/?%s", reqParams.Encode()), [][2]string{{"User-Agent", AliyunUserAgent}}, nil, callback, config.timeout)
|
|
if err != nil {
|
|
log.Errorf("failed call the safe check service: %v", err)
|
|
if ctx.GetContext("end_of_stream_received").(bool) {
|
|
proxywasm.ResumeHttpResponse()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if !ctx.GetContext("risk_detected").(bool) {
|
|
ctx.PushBuffer(data)
|
|
ctx.SetContext("end_of_stream_received", endOfStream)
|
|
if !ctx.GetContext("during_call").(bool) {
|
|
singleCall()
|
|
}
|
|
} else if endOfStream {
|
|
proxywasm.ResumeHttpResponse()
|
|
}
|
|
return []byte{}
|
|
}
|
|
|
|
func onHttpResponseBody(ctx wrapper.HttpContext, config AISecurityConfig, body []byte) types.Action {
|
|
log.Debugf("checking response body...")
|
|
startTime := time.Now().UnixMilli()
|
|
contentType, _ := proxywasm.GetHttpResponseHeader("content-type")
|
|
isStreamingResponse := strings.Contains(contentType, "event-stream")
|
|
var content string
|
|
if isStreamingResponse {
|
|
content = extractMessageFromStreamingBody(body, config.responseStreamContentJsonPath)
|
|
} else {
|
|
content = gjson.GetBytes(body, config.responseContentJsonPath).String()
|
|
}
|
|
log.Debugf("Raw response content is: %s", content)
|
|
if len(content) == 0 {
|
|
log.Info("response content is empty. skip")
|
|
return types.ActionContinue
|
|
}
|
|
contentIndex := 0
|
|
sessionID, _ := generateHexID(20)
|
|
var singleCall func()
|
|
callback := func(statusCode int, responseHeaders http.Header, responseBody []byte) {
|
|
log.Info(string(responseBody))
|
|
if statusCode != 200 || gjson.GetBytes(responseBody, "Code").Int() != 200 {
|
|
proxywasm.ResumeHttpResponse()
|
|
return
|
|
}
|
|
var response Response
|
|
err := json.Unmarshal(responseBody, &response)
|
|
if err != nil {
|
|
log.Error("failed to unmarshal aliyun content security response at response phase")
|
|
proxywasm.ResumeHttpResponse()
|
|
return
|
|
}
|
|
if isRiskLevelAcceptable(config.action, response.Data, config) {
|
|
if contentIndex >= len(content) {
|
|
endTime := time.Now().UnixMilli()
|
|
ctx.SetUserAttribute("safecheck_response_rt", endTime-startTime)
|
|
ctx.SetUserAttribute("safecheck_status", "response pass")
|
|
ctx.WriteUserAttributeToLogWithKey(wrapper.AILogKey)
|
|
proxywasm.ResumeHttpResponse()
|
|
} else {
|
|
singleCall()
|
|
}
|
|
return
|
|
}
|
|
denyMessage := DefaultDenyMessage
|
|
if config.denyMessage != "" {
|
|
denyMessage = config.denyMessage
|
|
} else if response.Data.Advice != nil && response.Data.Advice[0].Answer != "" {
|
|
denyMessage = response.Data.Advice[0].Answer
|
|
}
|
|
marshalledDenyMessage := marshalStr(denyMessage)
|
|
if config.protocolOriginal {
|
|
proxywasm.SendHttpResponse(uint32(config.denyCode), [][2]string{{"content-type", "application/json"}}, []byte(marshalledDenyMessage), -1)
|
|
} else if isStreamingResponse {
|
|
randomID := generateRandomID()
|
|
jsonData := []byte(fmt.Sprintf(OpenAIStreamResponseFormat, randomID, marshalledDenyMessage, randomID))
|
|
proxywasm.SendHttpResponse(uint32(config.denyCode), [][2]string{{"content-type", "text/event-stream;charset=UTF-8"}}, jsonData, -1)
|
|
} else {
|
|
randomID := generateRandomID()
|
|
jsonData := []byte(fmt.Sprintf(OpenAIResponseFormat, randomID, marshalledDenyMessage))
|
|
proxywasm.SendHttpResponse(uint32(config.denyCode), [][2]string{{"content-type", "application/json"}}, jsonData, -1)
|
|
}
|
|
config.incrementCounter("ai_sec_response_deny", 1)
|
|
endTime := time.Now().UnixMilli()
|
|
ctx.SetUserAttribute("safecheck_response_rt", endTime-startTime)
|
|
ctx.SetUserAttribute("safecheck_status", "response deny")
|
|
if response.Data.Advice != nil {
|
|
ctx.SetUserAttribute("safecheck_riskLabel", response.Data.Result[0].Label)
|
|
ctx.SetUserAttribute("safecheck_riskWords", response.Data.Result[0].RiskWords)
|
|
}
|
|
ctx.WriteUserAttributeToLogWithKey(wrapper.AILogKey)
|
|
}
|
|
singleCall = func() {
|
|
timestamp := time.Now().UTC().Format("2006-01-02T15:04:05Z")
|
|
randomID, _ := generateHexID(16)
|
|
var nextContentIndex int
|
|
if contentIndex+LengthLimit >= len(content) {
|
|
nextContentIndex = len(content)
|
|
} else {
|
|
nextContentIndex = contentIndex + LengthLimit
|
|
}
|
|
contentPiece := content[contentIndex:nextContentIndex]
|
|
contentIndex = nextContentIndex
|
|
log.Debugf("current content piece: %s", contentPiece)
|
|
consumer, _ := ctx.GetContext("consumer").(string)
|
|
checkService, ok := config.consumerSpecificResponseCheckService[consumer]
|
|
if !ok {
|
|
checkService = config.responseCheckService
|
|
}
|
|
params := map[string]string{
|
|
"Format": "JSON",
|
|
"Version": "2022-03-02",
|
|
"SignatureMethod": "Hmac-SHA1",
|
|
"SignatureNonce": randomID,
|
|
"SignatureVersion": "1.0",
|
|
"Action": config.action,
|
|
"AccessKeyId": config.ak,
|
|
"Timestamp": timestamp,
|
|
"Service": checkService,
|
|
"ServiceParameters": fmt.Sprintf(`{"sessionId": "%s","content": "%s","requestFrom": "%s"}`, sessionID, marshalStr(contentPiece), AliyunUserAgent),
|
|
}
|
|
if config.token != "" {
|
|
params["SecurityToken"] = config.token
|
|
}
|
|
signature := getSign(params, config.sk+"&")
|
|
reqParams := url.Values{}
|
|
for k, v := range params {
|
|
reqParams.Add(k, v)
|
|
}
|
|
reqParams.Add("Signature", signature)
|
|
err := config.client.Post(fmt.Sprintf("/?%s", reqParams.Encode()), [][2]string{{"User-Agent", AliyunUserAgent}}, nil, callback, config.timeout)
|
|
if err != nil {
|
|
log.Errorf("failed call the safe check service: %v", err)
|
|
proxywasm.ResumeHttpResponse()
|
|
}
|
|
}
|
|
singleCall()
|
|
return types.ActionPause
|
|
}
|
|
|
|
func extractMessageFromStreamingBody(data []byte, jsonPath string) string {
|
|
chunks := bytes.Split(bytes.TrimSpace(data), []byte("\n\n"))
|
|
strChunks := []string{}
|
|
for _, chunk := range chunks {
|
|
// Example: "choices":[{"index":0,"delta":{"role":"assistant","content":"%s"},"logprobs":null,"finish_reason":null}]
|
|
strChunks = append(strChunks, gjson.GetBytes(chunk, jsonPath).String())
|
|
}
|
|
return strings.Join(strChunks, "")
|
|
}
|
|
|
|
func marshalStr(raw string) string {
|
|
helper := map[string]string{
|
|
"placeholder": raw,
|
|
}
|
|
marshalledHelper, _ := json.Marshal(helper)
|
|
marshalledRaw := gjson.GetBytes(marshalledHelper, "placeholder").Raw
|
|
if len(marshalledRaw) >= 2 {
|
|
return marshalledRaw[1 : len(marshalledRaw)-1]
|
|
} else {
|
|
log.Errorf("failed to marshal json string, raw string is: %s", raw)
|
|
return ""
|
|
}
|
|
}
|