107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
package gcp
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import (
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"context"
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"encoding/json"
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"regexp"
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"strings"
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"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
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"github.com/trufflesecurity/trufflehog/v3/pkg/pb/detectorspb"
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"golang.org/x/oauth2/google"
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)
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type Scanner struct{}
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// Ensure the Scanner satisfies the interface at compile time.
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var _ detectors.Detector = (*Scanner)(nil)
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var (
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keyPat = regexp.MustCompile(`\{[^{]+auth_provider_x509_cert_url[^}]+\}`)
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)
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type gcpKey struct {
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Type string `json:"type"`
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ProjectID string `json:"project_id"`
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PrivateKeyID string `json:"private_key_id"`
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PrivateKey string `json:"private_key"`
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ClientEmail string `json:"client_email"`
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ClientID string `json:"client_id"`
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AuthURI string `json:"auth_uri"`
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TokenURI string `json:"token_uri"`
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AuthProviderX509CertURL string `json:"auth_provider_x509_cert_url"`
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ClientX509CertURL string `json:"client_x509_cert_url"`
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}
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func trimCarrots(s string) string {
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s = strings.TrimPrefix(s, "<")
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s = strings.TrimSuffix(s, ">")
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return s
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}
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// Keywords are used for efficiently pre-filtering chunks.
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// Use identifiers in the secret preferably, or the provider name.
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func (s Scanner) Keywords() []string {
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return []string{"provider_x509"}
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}
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// FromData will find and optionally verify GCP secrets in a given set of bytes.
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func (s Scanner) FromData(ctx context.Context, verify bool, data []byte) (results []detectors.Result, err error) {
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dataStr := string(data)
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matches := keyPat.FindAllString(dataStr, -1)
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for _, match := range matches {
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key := match
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key = strings.ReplaceAll(key, `,\\n`, `\n`)
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key = strings.ReplaceAll(key, `\"\\n`, `\n`)
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key = strings.ReplaceAll(key, `\\"`, `"`)
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creds := gcpKey{}
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err := json.Unmarshal([]byte(key), &creds)
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if err != nil {
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continue
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}
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// for Slack mangling (mailto scheme and hyperlinks)
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if strings.Contains(creds.ClientEmail, `<mailto:`) {
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creds.ClientEmail = strings.Split(strings.Split(creds.ClientEmail, `<mailto:`)[1], `|`)[0]
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}
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creds.AuthProviderX509CertURL = trimCarrots(creds.AuthProviderX509CertURL)
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creds.AuthURI = trimCarrots(creds.AuthURI)
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creds.ClientX509CertURL = trimCarrots(creds.ClientX509CertURL)
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creds.TokenURI = trimCarrots(creds.TokenURI)
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// Not sure why this might happen, but we've observed this with a verified cred
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raw := []byte(creds.ClientEmail)
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if len(raw) == 0 {
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raw = []byte(key)
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}
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s := detectors.Result{
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DetectorType: detectorspb.DetectorType_GCP,
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Raw: raw,
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Redacted: creds.ClientEmail,
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}
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if verify {
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credBytes, _ := json.Marshal(creds)
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credentials, err := google.CredentialsFromJSON(ctx, credBytes, "https://www.googleapis.com/auth/cloud-platform")
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if err != nil {
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continue
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}
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if credentials != nil {
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_, err = credentials.TokenSource.Token()
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if err == nil {
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s.Verified = true
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}
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}
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}
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results = append(results, s)
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}
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return
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}
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