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config.go
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config.go
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package main
import (
"errors"
"fmt"
"io/ioutil"
"os"
"path"
"regexp"
"strings"
"time"
"gopkg.in/yaml.v2"
)
type MainConfig struct {
Output OutputConfig `json:output yaml:output`
Input InputConfig `json:input yaml:input`
}
type OutputConfig struct {
AccessToken string `json:accesstoken yaml:accesstoken`
ServerKey string `json:serverkey yaml:serverkey`
Environment string `json:environment,omitempty yaml:environment,omitempty`
Proxy string `json:proxy,omitempty yaml:proxy,omitempty`
}
type InputConfig struct {
AllRules bool `json:allrules yaml:allrules`
Rules []string `json:rules yaml:rules`
NetworkInterface string `json:networkinterface yaml:networkinterface`
TrackDnsTraffic bool `json:trackdnstraffic yaml:trackdnstraffic`
RuleConfigs []RuleConfig `json:- yaml:-`
}
type RuleConfig struct {
Source string `json:source yaml:source`
Paths []string `json:paths yaml:paths`
Encoding string `json:encoding yaml:encoding`
DeadTime string `json:deadtime yaml:deadtime`
ExcludeFilesRegex string `json:excludefilesregex yaml:excludefilesregex`
Events []SecurityEventConfig `json:events yaml:events`
EventTimeFormat string `json:eventtimeformat yaml:eventtimeformat`
deadtime time.Duration `json:- yaml:-`
CompiledExcludeFilesRegex *regexp.Regexp `json:- yaml:-`
RuleFileName string `json:- yaml:-`
}
type SecurityEventConfig struct {
Sid uint `json:sid yaml:sid`
Gid uint `json:gid yaml:gid`
WinEventIds []uint `json:wineventids yaml:wineventids`
Message string `json:message yaml:message`
Regex string `json:regex yaml:regex`
Fields map[string]string `json:fields yaml:fields`
Exclude map[string]string `json:exclude yaml:exclude`
ExcludeCompiledRegex map[string]*regexp.Regexp `json:- yaml:-`
CompiledRegex *regexp.Regexp `json:- yaml:-`
Critical bool `json:critical yaml:critical`
}
func DiscoverYamlConfigs(directory string) (files []string, err error) {
fi, err := os.Stat(directory)
if err != nil {
return nil, err
}
files = make([]string, 0)
if fi.IsDir() {
entries, err := ioutil.ReadDir(directory)
if err != nil {
return nil, err
}
for _, filename := range entries {
if path.Ext(filename.Name()) == ".yml" {
files = append(files, path.Join(directory, filename.Name()))
}
}
}
return files, nil
}
func LoadConfig(options *Options) (config MainConfig, err error) {
directory := options.ConfigDir
mainConfig := path.Join(directory, "config.yml")
err = LoadYamlFile(mainConfig, &config)
if err != nil {
emitLine(logLevel.critical, "Failed loading main config file '%s': %s", mainConfig, err)
return
}
rulesDir := path.Join(directory, "rules.d")
ruleFiles, err := DiscoverYamlConfigs(rulesDir)
if err != nil {
emit(logLevel.critical, "Failed loading rules config files (*.yml) in directory: %s. Error: %s\n", rulesDir, err)
return
}
if len(ruleFiles) < 1 {
emit(logLevel.critical, "No *.yml rule config files found in directory: %s.\n", rulesDir)
return
}
rules := make([]RuleConfig, 0)
for _, ruleFile := range ruleFiles {
var rule RuleConfig
ruleConfigErr := LoadYamlFile(ruleFile, &rule)
if ruleConfigErr != nil {
emit(logLevel.important, "Failed loading file '%s': %s.\n", ruleFile, ruleConfigErr)
} else {
_, fileName := path.Split(ruleFile)
fileName = strings.ToLower(fileName)
rule.RuleFileName = strings.TrimSuffix(fileName, ".yml")
// normalize rule
if rule.DeadTime == "" {
rule.DeadTime = options.DefaultFileDeadtime
}
if rule.ExcludeFilesRegex == "" {
rule.ExcludeFilesRegex = options.DefaultExcludeFileFilter
}
rule.deadtime, err = time.ParseDuration(rule.DeadTime)
if err != nil {
emit(logLevel.important, "Failed parsing deadtime in file '%s': %s.\n", ruleFile, err)
continue
}
if len(rule.ExcludeFilesRegex) > 0 {
excludeFilesRegex, err := regexp.Compile(rule.ExcludeFilesRegex)
if err != nil {
emit(logLevel.important, "Failed parsing excludefilesregex '%s' in config file: '%s'. Error: %s\n", rule.ExcludeFilesRegex, ruleFile, err)
continue
}
rule.CompiledExcludeFilesRegex = excludeFilesRegex
}
events := make([]SecurityEventConfig, 0)
for _, event := range rule.Events {
regex := event.Regex
compiledRegex, err := regexp.Compile(regex)
if err != nil {
emit(logLevel.important, "Failed parsing regex '%s' in config file '%s'. Error: %s\n", regex, ruleFile, err)
continue
}
event.CompiledRegex = compiledRegex
if config.Input.AllRules == false {
if Contains(config.Input.Rules, rule.RuleFileName) == false {
continue
}
}
// compile exlude filter
if event.Exclude != nil && len(event.Exclude) > 0 {
event.ExcludeCompiledRegex = make(map[string]*regexp.Regexp)
for key, value := range event.Exclude {
excludeCompiledRegex, err := regexp.Compile(value)
if err != nil {
emit(logLevel.important, "Failed parsing exclude regex: '%s' in config file '%s'. Error: %s\n", value, ruleFile, err)
continue
}
event.ExcludeCompiledRegex[key] = excludeCompiledRegex
}
}
events = append(events, event)
}
rule.Events = events
if len(rule.Events) > 0 {
rules = append(rules, rule)
}
}
}
config.Input.RuleConfigs = rules
// emitJson(logLevel.verbose, config.Input)
ruleFiles = make([]string, 0)
for _, rule := range config.Input.RuleConfigs {
ruleFiles = append(ruleFiles, "'"+rule.RuleFileName+"'")
}
emit(logLevel.important, "Loaded rule files: %s.\n", strings.Join(ruleFiles, ", "))
return
}
func LoadYamlFile(path string, out interface{}) error {
ymlFile, err := os.Open(path)
if err != nil {
return err
}
fi, _ := ymlFile.Stat()
buffer := make([]byte, fi.Size())
_, err = ymlFile.Read(buffer)
buffer = []byte(os.ExpandEnv(string(buffer)))
err = yaml.Unmarshal(buffer, out)
if err != nil {
return errors.New(fmt.Sprintf("Incorrect yaml format: %s", err))
}
return nil
}