feat: ability to add own ct logs

fixes #52

Author: d-Rickyy-b

config.sample.yaml

@@ -17,3 +17,14 @@ prometheus:
   real_ip: false
   whitelist:
     - "127.0.0.1/8"
+
+general:
+  # When you want to add logs that are not contained in the log list provided by
+  # Google (https://www.gstatic.com/ct/log_list/v3/log_list.json), you can add them here.
+  additional_logs:
+    - url: https://ct.googleapis.com/logs/us1/mirrors/digicert_nessie2022/
+      operator: "DigiCert"
+      description: "DigiCert Nessie2022 log"
+    - url: https://dodo.ct.comodo.com/
+      operator: "Comodo"
+      description: "Comodo Dodo"

internal/certificatetransparency/ct-watcher.go

@@ -329,6 +329,35 @@ func getAllLogs() (loglist3.LogList, error) {
 		return loglist3.LogList{}, parseErr
 	}
 
+	// Add manually added logs from config to the allLogs list
+	if config.AppConfig.General.AdditionalLogs == nil {
+		return *allLogs, nil
+	}
+
+	for _, additionalLog := range config.AppConfig.General.AdditionalLogs {
+		customLog := loglist3.Log{
+			URL:         additionalLog.URL,
+			Description: additionalLog.Description,
+		}
+
+		operatorFound := false
+		for _, operator := range allLogs.Operators {
+			if operator.Name == additionalLog.Operator {
+				operator.Logs = append(operator.Logs, &customLog)
+				operatorFound = true
+				break
+			}
+		}
+
+		if !operatorFound {
+			newOperator := loglist3.Operator{
+				Name: additionalLog.Operator,
+				Logs: []*loglist3.Log{&customLog},
+			}
+			allLogs.Operators = append(allLogs.Operators, &newOperator)
+		}
+	}
+
 	// Add new ct logs to metrics
 	for _, operator := range allLogs.Operators {
 		for _, ctlog := range operator.Logs {

internal/config/config.go

@@ -25,6 +25,12 @@ type ServerConfig struct {
 	Whitelist   []string `yaml:"whitelist"`
 }
 
+type LogConfig struct {
+	Operator    string `yaml:"operator"`
+	URL         string `yaml:"url"`
+	Description string `yaml:"description"`
+}
+
 type Config struct {
 	Webserver struct {
 		ServerConfig       `yaml:",inline"`
@@ -39,6 +45,9 @@ type Config struct {
 		MetricsURL          string `yaml:"metrics_url"`
 		ExposeSystemMetrics bool   `yaml:"expose_system_metrics"`
 	}
+	General struct {
+		AdditionalLogs []LogConfig `yaml:"additional_logs"`
+	}
 }
 
 // ReadConfig reads the config file and returns a filled Config struct.
@@ -53,14 +62,14 @@ func ReadConfig(configPath string) (Config, error) {
 	if !validateConfig(conf) {
 		log.Fatalln("Invalid config")
 	}
-	AppConfig = conf
+	AppConfig = *conf
 
-	return conf, nil
+	return *conf, nil
 }
 
 // parseConfigFromFile reads the config file as bytes and passes it to parseConfigFromBytes.
 // It returns a filled Config struct.
-func parseConfigFromFile(configFile string) (Config, error) {
+func parseConfigFromFile(configFile string) (*Config, error) {
 	if configFile == "" {
 		configFile = "config.yml"
 	}
@@ -69,7 +78,7 @@ func parseConfigFromFile(configFile string) (Config, error) {
 	absPath, err := filepath.Abs(configFile)
 	if err != nil {
 		log.Printf("Couldn't convert to absolute path: '%s'\n", configFile)
-		return Config{}, err
+		return &Config{}, err
 	}
 
 	if _, statErr := os.Stat(absPath); os.IsNotExist(statErr) {
@@ -84,45 +93,46 @@ func parseConfigFromFile(configFile string) (Config, error) {
 			absPath += ".yaml"
 		default:
 			log.Printf("Config file '%s' does not have a valid extension\n", configFile)
-			return Config{}, statErr
+			return &Config{}, statErr
 		}
 
 		if _, secondStatErr := os.Stat(absPath); os.IsNotExist(secondStatErr) {
 			log.Printf("Config file '%s' does not exist\n", absPath)
-			return Config{}, secondStatErr
+			return &Config{}, secondStatErr
 		}
 	}
 	log.Printf("File '%s' exists\n", absPath)
 
 	yamlFileContent, readErr := os.ReadFile(absPath)
 	if readErr != nil {
-		return Config{}, readErr
+		return &Config{}, readErr
 	}
 
 	conf, parseErr := parseConfigFromBytes(yamlFileContent)
 	if parseErr != nil {
-		return Config{}, parseErr
+		return &Config{}, parseErr
 	}
 
 	return conf, nil
 }
 
 // parseConfigFromBytes parses the config bytes and returns a filled Config struct.
-func parseConfigFromBytes(data []byte) (Config, error) {
+func parseConfigFromBytes(data []byte) (*Config, error) {
 	var config Config
 
 	err := yaml.Unmarshal(data, &config)
 	if err != nil {
-		return config, err
+		return &config, err
 	}
 
-	return config, nil
+	return &config, nil
 }
 
 // validateConfig validates the config values and sets defaults for missing values.
-func validateConfig(config Config) bool {
+func validateConfig(config *Config) bool {
 	// Still matches invalid IP addresses but good enough for detecting completely wrong formats
-	URLRegex := regexp.MustCompile(`^(/[a-zA-Z0-9\-._]+)+$`)
+	URLPathRegex := regexp.MustCompile(`^(/[a-zA-Z0-9\-._]+)+$`)
+	URLRegex := regexp.MustCompile(`^https?://[a-zA-Z0-9\-._]+(:[0-9]+)?(/[a-zA-Z0-9\-._]+)*$`)
 
 	// Check webserver config
 	if config.Webserver.ListenAddr == "" || net.ParseIP(config.Webserver.ListenAddr) == nil {
@@ -135,17 +145,17 @@ func validateConfig(config Config) bool {
 		return false
 	}
 
-	if config.Webserver.FullURL == "" || !URLRegex.MatchString(config.Webserver.FullURL) {
+	if config.Webserver.FullURL == "" || !URLPathRegex.MatchString(config.Webserver.FullURL) {
 		log.Println("Webhook full URL is not set or does not match pattern '/...'")
 		config.Webserver.FullURL = "/full-stream"
 	}
 
-	if config.Webserver.LiteURL == "" || !URLRegex.MatchString(config.Webserver.FullURL) {
+	if config.Webserver.LiteURL == "" || !URLPathRegex.MatchString(config.Webserver.FullURL) {
 		log.Println("Webhook lite URL is not set or does not match pattern '/...'")
 		config.Webserver.LiteURL = "/"
 	}
 
-	if config.Webserver.DomainsOnlyURL == "" || !URLRegex.MatchString(config.Webserver.DomainsOnlyURL) {
+	if config.Webserver.DomainsOnlyURL == "" || !URLPathRegex.MatchString(config.Webserver.DomainsOnlyURL) {
 		log.Println("Webhook domains only URL is not set or does not match pattern '/...'")
 		config.Webserver.FullURL = "/domains-only"
 	}
@@ -187,5 +197,19 @@ func validateConfig(config Config) bool {
 		}
 	}
 
+	var validLogs []LogConfig
+	if len(config.General.AdditionalLogs) > 0 {
+		for _, ctLog := range config.General.AdditionalLogs {
+			if !URLRegex.MatchString(ctLog.URL) {
+				log.Println("Ignoring invalid additional log URL: ", ctLog.URL)
+				continue
+			}
+
+			validLogs = append(validLogs, ctLog)
+		}
+	}
+
+	config.General.AdditionalLogs = validLogs
+
 	return true
 }