feat(azure): create openai detector

Author: rgmz

pkg/detectors/azure_openai/azure_openai.go

@@ -0,0 +1,160 @@
+package azure_openai
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+
+	regexp "github.com/wasilibs/go-re2"
+
+	logContext "github.com/trufflesecurity/trufflehog/v3/pkg/context"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/pb/detectorspb"
+
+	"github.com/trufflesecurity/trufflehog/v3/pkg/common"
+)
+
+// Scanner detects API keys for Azure's OpenAI service.
+// https://learn.microsoft.com/en-us/azure/ai-services/openai/reference
+type Scanner struct {
+	client *http.Client
+}
+
+// Ensure the Scanner satisfies the interface at compile time.
+var _ detectors.Detector = (*Scanner)(nil)
+
+var (
+	// TODO: Investigate custom `azure-api.net` endpoints.
+	// https://github.com/openai/openai-python#microsoft-azure-openai
+	azureUrlPat = regexp.MustCompile(`(?i)([a-z0-9-]+\.openai\.azure\.com)`)
+	azureKeyPat = regexp.MustCompile(detectors.PrefixRegex([]string{"api[_.-]?key"}) + `\b(?-i:([a-f0-9]{32}))\b`)
+)
+
+// Keywords are used for efficiently pre-filtering chunks.
+// Use identifiers in the secret preferably, or the provider name.
+func (s Scanner) Keywords() []string {
+	return []string{".openai.azure.com"}
+}
+
+// FromData will find and optionally verify OpenAI secrets in a given set of bytes.
+func (s Scanner) FromData(ctx context.Context, verify bool, data []byte) (results []detectors.Result, err error) {
+	dataStr := string(data)
+
+	// De-duplicate results.
+	tokens := make(map[string]struct{})
+	for _, match := range azureKeyPat.FindAllStringSubmatch(dataStr, -1) {
+		tokens[match[1]] = struct{}{}
+	}
+	if len(tokens) == 0 {
+		return
+	}
+	urls := make(map[string]struct{})
+	for _, match := range azureUrlPat.FindAllStringSubmatch(dataStr, -1) {
+		urls[match[1]] = struct{}{}
+	}
+
+	// Process results.
+	logCtx := logContext.AddLogger(ctx)
+	for token := range tokens {
+		s1 := detectors.Result{
+			DetectorType: s.Type(),
+			Redacted:     token[:3] + "..." + token[25:],
+			Raw:          []byte(token),
+		}
+
+		for url := range urls {
+			if verify {
+				client := s.client
+				if client == nil {
+					client = common.SaneHttpClient()
+				}
+
+				isVerified, extraData, verificationErr := verifyAzureToken(logCtx, client, url, token)
+				if isVerified || len(urls) == 1 {
+					s1.RawV2 = []byte(token + ":" + url)
+					s1.Verified = isVerified
+					s1.ExtraData = extraData
+					s1.SetVerificationError(verificationErr, token)
+					break
+				}
+			}
+		}
+
+		if s1.Verified {
+			results = append(results, s1)
+		} else {
+			if detectors.IsKnownFalsePositive(string(s1.Raw), detectors.DefaultFalsePositives, true) {
+				continue
+			}
+			results = append(results, s1)
+		}
+	}
+	return
+}
+
+func verifyAzureToken(ctx logContext.Context, client *http.Client, baseUrl, token string) (bool, map[string]string, error) {
+	// TODO: Replace this with a more suitable long-term endpoint.
+	// Most endpoints require additional info, e.g., deployment name, which complicates verification.
+	// This may be retired in the future, so we should look for another candidate.
+	// https://learn.microsoft.com/en-us/answers/questions/1371786/get-azure-openai-deployments-in-api
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, fmt.Sprintf("https://%s/openai/deployments?api-version=2023-03-15-preview", baseUrl), nil)
+	if err != nil {
+		return false, nil, nil
+	}
+
+	req.Header.Add("Content-Type", "application/json")
+	req.Header.Add("api-key", token)
+	res, err := client.Do(req)
+	if err != nil {
+		return false, nil, err
+	}
+	defer func() {
+		_, _ = io.Copy(io.Discard, res.Body)
+		_ = res.Body.Close()
+	}()
+
+	switch res.StatusCode {
+	case http.StatusOK:
+		body, err := io.ReadAll(res.Body)
+		if err != nil {
+			return false, nil, err
+		}
+
+		var deployments deploymentsResponse
+		if err := json.Unmarshal(body, &deployments); err != nil {
+			if json.Valid(body) {
+				return false, nil, fmt.Errorf("failed to decode response %s: %w", req.URL, err)
+			} else {
+				// If the response isn't JSON it's highly unlikely to be valid.
+				return false, nil, nil
+			}
+		}
+
+		// JSON unmarshal doesn't check whether the structure actually matches.
+		if deployments.Object == "" {
+			return false, nil, nil
+		}
+
+		// No extra data available at the moment.
+		return true, nil, nil
+	case http.StatusUnauthorized:
+		return false, nil, nil
+	default:
+		return false, nil, fmt.Errorf("unexpected response status %d for %s", res.StatusCode, req.URL)
+	}
+}
+
+type deploymentsResponse struct {
+	Data   []deployment `json:"data"`
+	Object string       `json:"object"`
+}
+
+type deployment struct {
+	ID string `json:"id"`
+}
+
+func (s Scanner) Type() detectorspb.DetectorType {
+	return detectorspb.DetectorType_AzureOpenAI
+}