|
| 1 | +package censys |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "encoding/base64" |
| 6 | + "encoding/json" |
| 7 | + "flag" |
| 8 | + "fmt" |
| 9 | + "io" |
| 10 | + "log" |
| 11 | + "net/http" |
| 12 | + "path" |
| 13 | + "time" |
| 14 | + |
| 15 | + "github.com/lanrat/certgraph/driver" |
| 16 | + "github.com/lanrat/certgraph/fingerprint" |
| 17 | + "github.com/lanrat/certgraph/status" |
| 18 | +) |
| 19 | + |
| 20 | +const driverName = "censys" |
| 21 | + |
| 22 | +var debug = false |
| 23 | + |
| 24 | +// TODO support rate limits & pagnation |
| 25 | + |
| 26 | +var ( |
| 27 | + defaultHTTPClient = &http.Client{} |
| 28 | + |
| 29 | + appID = flag.String("censys-appid", "", "censys API AppID") |
| 30 | + secret = flag.String("censys-secret", "", "censys API Secret") |
| 31 | +) |
| 32 | + |
| 33 | +func init() { |
| 34 | + driver.AddDriver(driverName) |
| 35 | +} |
| 36 | + |
| 37 | +type censys struct { |
| 38 | + appID string |
| 39 | + secret string |
| 40 | + save bool |
| 41 | + savePath string |
| 42 | + includeSubdomains bool |
| 43 | + includeExpired bool |
| 44 | +} |
| 45 | + |
| 46 | +type censysCertDriver struct { |
| 47 | + host string |
| 48 | + fingerprints driver.FingerprintMap |
| 49 | + driver *censys |
| 50 | +} |
| 51 | + |
| 52 | +func (c *censysCertDriver) GetFingerprints() (driver.FingerprintMap, error) { |
| 53 | + return c.fingerprints, nil |
| 54 | +} |
| 55 | + |
| 56 | +func (c *censysCertDriver) GetStatus() status.Map { |
| 57 | + return status.NewMap(c.host, status.New(status.CT)) |
| 58 | +} |
| 59 | + |
| 60 | +func (c *censysCertDriver) GetRelated() ([]string, error) { |
| 61 | + return make([]string, 0), nil |
| 62 | +} |
| 63 | + |
| 64 | +func (c *censysCertDriver) QueryCert(fp fingerprint.Fingerprint) (*driver.CertResult, error) { |
| 65 | + return c.driver.QueryCert(fp) |
| 66 | +} |
| 67 | + |
| 68 | +// TODO support pagnation |
| 69 | +func domainSearchParam(domain string, includeExpired, includeSubdomain bool) certSearchParam { |
| 70 | + var s certSearchParam |
| 71 | + if includeSubdomain { |
| 72 | + s.Query = fmt.Sprintf("(parsed.names: %s )", domain) |
| 73 | + } else { |
| 74 | + s.Query = fmt.Sprintf("(parsed.names.raw: %s)", domain) |
| 75 | + } |
| 76 | + if !includeExpired { |
| 77 | + dateStr := time.Now().Format("2006-01-02") // YYYY-MM-DD |
| 78 | + expQuery := fmt.Sprintf(" AND ((parsed.validity.end: [%s TO *]) AND (parsed.validity.start: [* TO %s]))", dateStr, dateStr) |
| 79 | + s.Query = s.Query + expQuery |
| 80 | + } |
| 81 | + s.Page = 1 |
| 82 | + s.Flatten = true |
| 83 | + s.Fields = []string{"parsed.fingerprint_sha256", "parsed.names"} |
| 84 | + return s |
| 85 | +} |
| 86 | + |
| 87 | +// Driver creates a new CT driver for censys |
| 88 | +func Driver(savePath string, includeSubdomains, includeExpired bool) (driver.Driver, error) { |
| 89 | + if *appID == "" || *secret == "" { |
| 90 | + return nil, fmt.Errorf("censys requires an appID and secret to run") |
| 91 | + } |
| 92 | + d := new(censys) |
| 93 | + d.appID = *appID |
| 94 | + d.secret = *secret |
| 95 | + d.savePath = savePath |
| 96 | + d.includeSubdomains = includeSubdomains |
| 97 | + d.includeExpired = includeExpired |
| 98 | + return d, nil |
| 99 | +} |
| 100 | + |
| 101 | +func (d *censys) GetName() string { |
| 102 | + return driverName |
| 103 | +} |
| 104 | + |
| 105 | +func (d *censys) request(method, url string, request io.Reader) (*http.Response, error) { |
| 106 | + totalTrys := 3 |
| 107 | + var err error |
| 108 | + var req *http.Request |
| 109 | + var resp *http.Response |
| 110 | + for try := 1; try <= totalTrys; try++ { |
| 111 | + req, err = http.NewRequest(method, url, request) |
| 112 | + if err != nil { |
| 113 | + return nil, err |
| 114 | + } |
| 115 | + if request != nil { |
| 116 | + req.Header.Add("Content-Type", "application/json") |
| 117 | + } |
| 118 | + req.Header.Add("Accept", "application/json") |
| 119 | + req.SetBasicAuth(d.appID, d.secret) |
| 120 | + |
| 121 | + resp, err = defaultHTTPClient.Do(req) |
| 122 | + if err != nil { |
| 123 | + err = fmt.Errorf("error on request [%d/%d] %s, got error %w: %+v", try, totalTrys, url, err, resp) |
| 124 | + } else { |
| 125 | + return resp, nil |
| 126 | + } |
| 127 | + |
| 128 | + // sleep only if we will try again |
| 129 | + if try < totalTrys { |
| 130 | + time.Sleep(time.Second * 10) |
| 131 | + } |
| 132 | + } |
| 133 | + return resp, err |
| 134 | +} |
| 135 | + |
| 136 | +// jsonRequest performes a request to the API endpoint sending and receiving JSON objects |
| 137 | +func (d *censys) jsonRequest(method, url string, request, response interface{}) error { |
| 138 | + var payloadReader io.Reader |
| 139 | + if request != nil { |
| 140 | + jsonPayload, err := json.Marshal(request) |
| 141 | + if err != nil { |
| 142 | + return err |
| 143 | + } |
| 144 | + payloadReader = bytes.NewReader(jsonPayload) |
| 145 | + } |
| 146 | + |
| 147 | + if debug { |
| 148 | + log.Printf("DEBUG: request to %s %s", method, url) |
| 149 | + if request != nil { |
| 150 | + prettyJSONBytes, _ := json.MarshalIndent(request, "", "\t") |
| 151 | + log.Printf("request payload:\n%s\n", string(prettyJSONBytes)) |
| 152 | + } |
| 153 | + } |
| 154 | + |
| 155 | + resp, err := d.request(method, url, payloadReader) |
| 156 | + if err != nil { |
| 157 | + return err |
| 158 | + } |
| 159 | + defer resp.Body.Close() |
| 160 | + |
| 161 | + // got an error, decode it |
| 162 | + if resp.StatusCode != http.StatusOK { |
| 163 | + var errorResp errorResponse |
| 164 | + err := fmt.Errorf("error on request %s, got Status %s %s", url, resp.Status, http.StatusText(resp.StatusCode)) |
| 165 | + jsonError := json.NewDecoder(resp.Body).Decode(&errorResp) |
| 166 | + if jsonError != nil { |
| 167 | + return fmt.Errorf("error decoding json %w on errord request: %s", jsonError, err.Error()) |
| 168 | + } |
| 169 | + return fmt.Errorf("%w, HTTPStatus: %d Message: %q", err, errorResp.ErrorCode, errorResp.Error) |
| 170 | + } |
| 171 | + |
| 172 | + if response != nil { |
| 173 | + err = json.NewDecoder(resp.Body).Decode(&response) |
| 174 | + if err != nil { |
| 175 | + return err |
| 176 | + } |
| 177 | + if debug { |
| 178 | + prettyJSONBytes, _ := json.MarshalIndent(response, "", "\t") |
| 179 | + log.Printf("response payload:\n%s\n", string(prettyJSONBytes)) |
| 180 | + } |
| 181 | + } |
| 182 | + |
| 183 | + return nil |
| 184 | +} |
| 185 | + |
| 186 | +func (d *censys) QueryDomain(domain string) (driver.Result, error) { |
| 187 | + results := &censysCertDriver{ |
| 188 | + host: domain, |
| 189 | + fingerprints: make(driver.FingerprintMap), |
| 190 | + driver: d, |
| 191 | + } |
| 192 | + params := domainSearchParam(domain, d.includeExpired, d.includeSubdomains) |
| 193 | + url := "https://search.censys.io/api/v1/search/certificates" |
| 194 | + var resp certSearchResponse |
| 195 | + err := d.jsonRequest(http.MethodPost, url, params, &resp) |
| 196 | + if err != nil { |
| 197 | + return results, err |
| 198 | + } |
| 199 | + |
| 200 | + for _, r := range resp.Results { |
| 201 | + fp := fingerprint.FromHexHash(r.Fingerprint) |
| 202 | + results.fingerprints.Add(domain, fp) |
| 203 | + } |
| 204 | + |
| 205 | + if debug { |
| 206 | + log.Printf("censys: got %d results for %s.", len(resp.Results), domain) |
| 207 | + } |
| 208 | + |
| 209 | + return results, nil |
| 210 | +} |
| 211 | + |
| 212 | +func (d *censys) QueryCert(fp fingerprint.Fingerprint) (*driver.CertResult, error) { |
| 213 | + certNode := new(driver.CertResult) |
| 214 | + certNode.Fingerprint = fp |
| 215 | + certNode.Domains = make([]string, 0, 5) |
| 216 | + |
| 217 | + url := fmt.Sprintf("https://search.censys.io/api/v1/view/certificates/%s", fp.HexString()) |
| 218 | + var resp certViewResponse |
| 219 | + err := d.jsonRequest(http.MethodGet, url, nil, &resp) |
| 220 | + if err != nil { |
| 221 | + return certNode, err |
| 222 | + } |
| 223 | + |
| 224 | + if debug { |
| 225 | + log.Printf("DEBUG QueryCert(%s): %v", fp.HexString(), resp.Parsed.Names) |
| 226 | + } |
| 227 | + |
| 228 | + certNode.Domains = append(certNode.Domains, resp.Parsed.Names...) |
| 229 | + |
| 230 | + if d.save { |
| 231 | + rawCert, err := base64.StdEncoding.DecodeString(resp.Raw) |
| 232 | + if err != nil { |
| 233 | + return certNode, err |
| 234 | + } |
| 235 | + err = driver.RawCertToPEMFile(rawCert, path.Join(d.savePath, fp.HexString())+".pem") |
| 236 | + if err != nil { |
| 237 | + return certNode, err |
| 238 | + } |
| 239 | + } |
| 240 | + |
| 241 | + return certNode, nil |
| 242 | +} |
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