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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,242 @@ | ||
| package censys | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "flag" | ||
| "fmt" | ||
| "io" | ||
| "log" | ||
| "net/http" | ||
| "path" | ||
| "time" | ||
|
|
||
| "github.com/lanrat/certgraph/driver" | ||
| "github.com/lanrat/certgraph/fingerprint" | ||
| "github.com/lanrat/certgraph/status" | ||
| ) | ||
|
|
||
| const driverName = "censys" | ||
|
|
||
| var debug = false | ||
|
|
||
| // TODO support rate limits & pagnation | ||
|
|
||
| var ( | ||
| defaultHTTPClient = &http.Client{} | ||
|
|
||
| appID = flag.String("censys-appid", "", "censys API AppID") | ||
| secret = flag.String("censys-secret", "", "censys API Secret") | ||
| ) | ||
|
|
||
| func init() { | ||
| driver.AddDriver(driverName) | ||
| } | ||
|
|
||
| type censys struct { | ||
| appID string | ||
| secret string | ||
| save bool | ||
| savePath string | ||
| includeSubdomains bool | ||
| includeExpired bool | ||
| } | ||
|
|
||
| type censysCertDriver struct { | ||
| host string | ||
| fingerprints driver.FingerprintMap | ||
| driver *censys | ||
| } | ||
|
|
||
| func (c *censysCertDriver) GetFingerprints() (driver.FingerprintMap, error) { | ||
| return c.fingerprints, nil | ||
| } | ||
|
|
||
| func (c *censysCertDriver) GetStatus() status.Map { | ||
| return status.NewMap(c.host, status.New(status.CT)) | ||
| } | ||
|
|
||
| func (c *censysCertDriver) GetRelated() ([]string, error) { | ||
| return make([]string, 0), nil | ||
| } | ||
|
|
||
| func (c *censysCertDriver) QueryCert(fp fingerprint.Fingerprint) (*driver.CertResult, error) { | ||
| return c.driver.QueryCert(fp) | ||
| } | ||
|
|
||
| // TODO support pagnation | ||
| func domainSearchParam(domain string, includeExpired, includeSubdomain bool) certSearchParam { | ||
| var s certSearchParam | ||
| if includeSubdomain { | ||
| s.Query = fmt.Sprintf("(parsed.names: %s )", domain) | ||
| } else { | ||
| s.Query = fmt.Sprintf("(parsed.names.raw: %s)", domain) | ||
| } | ||
| if !includeExpired { | ||
| dateStr := time.Now().Format("2006-01-02") // YYYY-MM-DD | ||
| expQuery := fmt.Sprintf(" AND ((parsed.validity.end: [%s TO *]) AND (parsed.validity.start: [* TO %s]))", dateStr, dateStr) | ||
| s.Query = s.Query + expQuery | ||
| } | ||
| s.Page = 1 | ||
| s.Flatten = true | ||
| s.Fields = []string{"parsed.fingerprint_sha256", "parsed.names"} | ||
| return s | ||
| } | ||
|
|
||
| // Driver creates a new CT driver for censys | ||
| func Driver(savePath string, includeSubdomains, includeExpired bool) (driver.Driver, error) { | ||
| if *appID == "" || *secret == "" { | ||
| return nil, fmt.Errorf("censys requires an appID and secret to run") | ||
| } | ||
| d := new(censys) | ||
| d.appID = *appID | ||
| d.secret = *secret | ||
| d.savePath = savePath | ||
| d.includeSubdomains = includeSubdomains | ||
| d.includeExpired = includeExpired | ||
| return d, nil | ||
| } | ||
|
|
||
| func (d *censys) GetName() string { | ||
| return driverName | ||
| } | ||
|
|
||
| func (d *censys) request(method, url string, request io.Reader) (*http.Response, error) { | ||
| totalTrys := 3 | ||
| var err error | ||
| var req *http.Request | ||
| var resp *http.Response | ||
| for try := 1; try <= totalTrys; try++ { | ||
| req, err = http.NewRequest(method, url, request) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if request != nil { | ||
| req.Header.Add("Content-Type", "application/json") | ||
| } | ||
| req.Header.Add("Accept", "application/json") | ||
| req.SetBasicAuth(d.appID, d.secret) | ||
|
|
||
| resp, err = defaultHTTPClient.Do(req) | ||
| if err != nil { | ||
| err = fmt.Errorf("error on request [%d/%d] %s, got error %w: %+v", try, totalTrys, url, err, resp) | ||
| } else { | ||
| return resp, nil | ||
| } | ||
|
|
||
| // sleep only if we will try again | ||
| if try < totalTrys { | ||
| time.Sleep(time.Second * 10) | ||
| } | ||
| } | ||
| return resp, err | ||
| } | ||
|
|
||
| // jsonRequest performes a request to the API endpoint sending and receiving JSON objects | ||
| func (d *censys) jsonRequest(method, url string, request, response interface{}) error { | ||
| var payloadReader io.Reader | ||
| if request != nil { | ||
| jsonPayload, err := json.Marshal(request) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| payloadReader = bytes.NewReader(jsonPayload) | ||
| } | ||
|
|
||
| if debug { | ||
| log.Printf("DEBUG: request to %s %s", method, url) | ||
| if request != nil { | ||
| prettyJSONBytes, _ := json.MarshalIndent(request, "", "\t") | ||
| log.Printf("request payload:\n%s\n", string(prettyJSONBytes)) | ||
| } | ||
| } | ||
|
|
||
| resp, err := d.request(method, url, payloadReader) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| // got an error, decode it | ||
| if resp.StatusCode != http.StatusOK { | ||
| var errorResp errorResponse | ||
| err := fmt.Errorf("error on request %s, got Status %s %s", url, resp.Status, http.StatusText(resp.StatusCode)) | ||
| jsonError := json.NewDecoder(resp.Body).Decode(&errorResp) | ||
| if jsonError != nil { | ||
| return fmt.Errorf("error decoding json %w on errord request: %s", jsonError, err.Error()) | ||
| } | ||
| return fmt.Errorf("%w, HTTPStatus: %d Message: %q", err, errorResp.ErrorCode, errorResp.Error) | ||
| } | ||
|
|
||
| if response != nil { | ||
| err = json.NewDecoder(resp.Body).Decode(&response) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if debug { | ||
| prettyJSONBytes, _ := json.MarshalIndent(response, "", "\t") | ||
| log.Printf("response payload:\n%s\n", string(prettyJSONBytes)) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (d *censys) QueryDomain(domain string) (driver.Result, error) { | ||
| results := &censysCertDriver{ | ||
| host: domain, | ||
| fingerprints: make(driver.FingerprintMap), | ||
| driver: d, | ||
| } | ||
| params := domainSearchParam(domain, d.includeExpired, d.includeSubdomains) | ||
| url := "https://search.censys.io/api/v1/search/certificates" | ||
| var resp certSearchResponse | ||
| err := d.jsonRequest(http.MethodPost, url, params, &resp) | ||
| if err != nil { | ||
| return results, err | ||
| } | ||
|
|
||
| for _, r := range resp.Results { | ||
| fp := fingerprint.FromHexHash(r.Fingerprint) | ||
| results.fingerprints.Add(domain, fp) | ||
| } | ||
|
|
||
| if debug { | ||
| log.Printf("censys: got %d results for %s.", len(resp.Results), domain) | ||
| } | ||
|
|
||
| return results, nil | ||
| } | ||
|
|
||
| func (d *censys) QueryCert(fp fingerprint.Fingerprint) (*driver.CertResult, error) { | ||
| certNode := new(driver.CertResult) | ||
| certNode.Fingerprint = fp | ||
| certNode.Domains = make([]string, 0, 5) | ||
|
|
||
| url := fmt.Sprintf("https://search.censys.io/api/v1/view/certificates/%s", fp.HexString()) | ||
| var resp certViewResponse | ||
| err := d.jsonRequest(http.MethodGet, url, nil, &resp) | ||
| if err != nil { | ||
| return certNode, err | ||
| } | ||
|
|
||
| if debug { | ||
| log.Printf("DEBUG QueryCert(%s): %v", fp.HexString(), resp.Parsed.Names) | ||
| } | ||
|
|
||
| certNode.Domains = append(certNode.Domains, resp.Parsed.Names...) | ||
|
|
||
| if d.save { | ||
| rawCert, err := base64.StdEncoding.DecodeString(resp.Raw) | ||
| if err != nil { | ||
| return certNode, err | ||
| } | ||
| err = driver.RawCertToPEMFile(rawCert, path.Join(d.savePath, fp.HexString())+".pem") | ||
| if err != nil { | ||
| return certNode, err | ||
| } | ||
| } | ||
|
|
||
| return certNode, nil | ||
| } |
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