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package main
import (
"context"
"crypto/sha256"
"errors"
"fmt"
"github.com/flier/gohs/hyperscan"
"github.com/go-playground/validator/v10"
log "github.com/sirupsen/logrus"
"sync"
"time"
)
type RegexFlags struct {
Caseless bool `json:"caseless" bson:"caseless,omitempty"` // Set case-insensitive matching.
DotAll bool `json:"dot_all" bson:"dot_all,omitempty"` // Matching a `.` will not exclude newlines.
MultiLine bool `json:"multi_line" bson:"multi_line,omitempty"` // Set multi-line anchoring.
SingleMatch bool `json:"single_match" bson:"single_match,omitempty"` // Set single-match only mode.
Utf8Mode bool `json:"utf_8_mode" bson:"utf_8_mode,omitempty"` // Enable UTF-8 mode for this expression.
UnicodeProperty bool `json:"unicode_property" bson:"unicode_property,omitempty"` // Enable Unicode property support for this expression
}
type Pattern struct {
Regex string `json:"regex" binding:"min=1" bson:"regex"`
Flags RegexFlags `json:"flags" bson:"flags,omitempty"`
MinOccurrences uint `json:"min_occurrences" bson:"min_occurrences,omitempty"`
MaxOccurrences uint `json:"max_occurrences" binding:"omitempty,gtefield=MinOccurrences" bson:"max_occurrences,omitempty"`
internalID int
compiledPattern *hyperscan.Pattern
}
type Filter struct {
ServicePort uint16 `json:"service_port" bson:"service_port,omitempty"`
ClientAddress string `json:"client_address" binding:"ip_addr" bson:"client_address,omitempty"`
ClientPort uint16 `json:"client_port" bson:"client_port,omitempty"`
MinDuration uint `json:"min_duration" bson:"min_duration,omitempty"`
MaxDuration uint `json:"max_duration" binding:"omitempty,gtefield=MinDuration" bson:"max_duration,omitempty"`
MinBytes uint `json:"min_bytes" bson:"min_bytes,omitempty"`
MaxBytes uint `json:"max_bytes" binding:"omitempty,gtefield=MinBytes" bson:"max_bytes,omitempty"`
}
type Rule struct {
ID RowID `json:"id" bson:"_id,omitempty"`
Name string `json:"name" binding:"min=3" bson:"name"`
Color string `json:"color" binding:"hexcolor" bson:"color"`
Notes string `json:"notes" bson:"notes,omitempty"`
Enabled bool `json:"enabled" bson:"enabled"`
Patterns []Pattern `json:"patterns" binding:"required,min=1" bson:"patterns"`
Filter Filter `json:"filter" bson:"filter,omitempty"`
Version int64 `json:"version" bson:"version"`
}
type RulesDatabase struct {
database hyperscan.StreamDatabase
databaseSize int
version RowID
}
type RulesManager interface {
LoadRules() error
AddRule(context context.Context, rule Rule) (RowID, error)
GetRule(id RowID) (Rule, bool)
UpdateRule(context context.Context, rule Rule) bool
GetRules() []Rule
FillWithMatchedRules(connection *Connection, clientMatches map[uint][]PatternSlice, serverMatches map[uint][]PatternSlice)
DatabaseUpdateChannel() chan RulesDatabase
}
type rulesManagerImpl struct {
storage Storage
rules map[RowID]Rule
rulesByName map[string]Rule
patterns map[string]Pattern
mutex sync.Mutex
databaseUpdated chan RulesDatabase
validate *validator.Validate
}
func NewRulesManager(storage Storage) RulesManager {
return &rulesManagerImpl{
storage: storage,
rules: make(map[RowID]Rule),
rulesByName: make(map[string]Rule),
patterns: make(map[string]Pattern),
mutex: sync.Mutex{},
databaseUpdated: make(chan RulesDatabase),
validate: validator.New(),
}
}
func (rm *rulesManagerImpl) LoadRules() error {
var rules []Rule
if err := rm.storage.Find(Rules).Sort("_id", true).All(&rules); err != nil {
return err
}
for _, rule := range rules {
if err := rm.validateAndAddRuleLocal(&rule); err != nil {
log.WithError(err).WithField("rule", rule).Warn("failed to import rule")
}
}
return rm.generateDatabase(rules[len(rules)-1].ID)
}
func (rm *rulesManagerImpl) AddRule(context context.Context, rule Rule) (RowID, error) {
rm.mutex.Lock()
rule.ID = rm.storage.NewCustomRowID(uint64(len(rm.rules)), time.Now())
rule.Enabled = true
if err := rm.validateAndAddRuleLocal(&rule); err != nil {
rm.mutex.Unlock()
return rule.ID, err
}
if err := rm.generateDatabase(rule.ID); err != nil {
rm.mutex.Unlock()
log.WithError(err).WithField("rule", rule).Panic("failed to generate database")
}
rm.mutex.Unlock()
if _, err := rm.storage.Insert(Rules).Context(context).One(rule); err != nil {
log.WithError(err).WithField("rule", rule).Panic("failed to insert rule on database")
}
return rule.ID, nil
}
func (rm *rulesManagerImpl) GetRule(id RowID) (Rule, bool) {
rule, isPresent := rm.rules[id]
return rule, isPresent
}
func (rm *rulesManagerImpl) UpdateRule(context context.Context, rule Rule) bool {
updated, err := rm.storage.Update(Rules).Context(context).Filter(OrderedDocument{{"_id", rule.ID}}).
One(UnorderedDocument{"name": rule.Name, "color": rule.Color})
if err != nil {
log.WithError(err).WithField("rule", rule).Panic("failed to update rule on database")
}
if updated {
rm.mutex.Lock()
newRule := rm.rules[rule.ID]
newRule.Name = rule.Name
newRule.Color = rule.Color
delete(rm.rulesByName, newRule.Name)
rm.rulesByName[rule.Name] = newRule
rm.rules[rule.ID] = newRule
rm.mutex.Unlock()
}
return updated
}
func (rm *rulesManagerImpl) GetRules() []Rule {
rules := make([]Rule, 0, len(rm.rules))
for _, rule := range rm.rules {
rules = append(rules, rule)
}
return rules
}
func (rm *rulesManagerImpl) FillWithMatchedRules(connection *Connection, clientMatches map[uint][]PatternSlice,
serverMatches map[uint][]PatternSlice) {
}
func (rm *rulesManagerImpl) DatabaseUpdateChannel() chan RulesDatabase {
return rm.databaseUpdated
}
func (rm *rulesManagerImpl) validateAndAddRuleLocal(rule *Rule) error {
if _, alreadyPresent := rm.rulesByName[rule.Name]; alreadyPresent {
return errors.New("rule name must be unique")
}
newPatterns := make(map[string]Pattern)
for i, pattern := range rule.Patterns {
if err := rm.validate.Struct(pattern); err != nil {
return err
}
hash := pattern.Hash()
if existingPattern, isPresent := rm.patterns[hash]; isPresent {
rule.Patterns[i] = existingPattern
continue
}
if err := pattern.BuildPattern(); err != nil {
return err
}
pattern.internalID = len(rm.patterns) + len(newPatterns)
newPatterns[hash] = pattern
}
for key, value := range newPatterns {
rm.patterns[key] = value
}
rm.rules[rule.ID] = *rule
rm.rulesByName[rule.Name] = *rule
return nil
}
func (rm *rulesManagerImpl) generateDatabase(version RowID) error {
patterns := make([]*hyperscan.Pattern, 0, len(rm.patterns))
for _, pattern := range rm.patterns {
patterns = append(patterns, pattern.compiledPattern)
}
database, err := hyperscan.NewStreamDatabase(patterns...)
if err != nil {
return err
}
rm.databaseUpdated <- RulesDatabase{
database: database,
databaseSize: len(patterns),
version: version,
}
return nil
}
func (p *Pattern) BuildPattern() error {
if p.compiledPattern != nil {
return nil
}
hp, err := hyperscan.ParsePattern(fmt.Sprintf("/%s/", p.Regex))
if err != nil {
return err
}
if p.Flags.Caseless {
hp.Flags |= hyperscan.Caseless
}
if p.Flags.DotAll {
hp.Flags |= hyperscan.DotAll
}
if p.Flags.MultiLine {
hp.Flags |= hyperscan.MultiLine
}
if p.Flags.SingleMatch {
hp.Flags |= hyperscan.SingleMatch
}
if p.Flags.Utf8Mode {
hp.Flags |= hyperscan.Utf8Mode
}
if p.Flags.UnicodeProperty {
hp.Flags |= hyperscan.UnicodeProperty
}
if !hp.IsValid() {
return errors.New("can't validate the pattern")
}
p.compiledPattern = hp
return nil
}
func (p Pattern) Hash() string {
hash := sha256.New()
hash.Write([]byte(fmt.Sprintf("%s|%v|%v|%v", p.Regex, p.Flags, p.MinOccurrences, p.MaxOccurrences)))
return fmt.Sprintf("%x", hash.Sum(nil))
}
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