87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package ldap
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import (
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"math/rand"
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"time"
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osm "git.loafle.net/overflow/service_matcher-go"
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ber "gopkg.in/asn1-ber.v1"
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)
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const (
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ApplicationBindRequest = 0
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ApplicationBindResponse = 1
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)
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type LDAPMatcher struct {
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osm.Matchers
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reqID int64
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}
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func (l *LDAPMatcher) Key() string {
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return "LDAP"
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}
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func (l *LDAPMatcher) Name() string {
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return "LDAP"
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}
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func (l *LDAPMatcher) Meta() osm.Metadata {
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return nil
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}
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func (l *LDAPMatcher) IsPrePacket() bool {
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return false
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}
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func (l *LDAPMatcher) IsError(info osm.MatchInfo, index int, packet *osm.Packet) bool {
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return false
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}
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func (l *LDAPMatcher) Match(info osm.MatchInfo, index int, packet *osm.Packet) error {
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if packet == nil || !packet.Valid() {
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return osm.NoPacketReceivedError()
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}
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p := ber.DecodePacket(packet.Buffer)
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if len(p.Children) <= 1 {
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return osm.NotMatchedError()
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}
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respID, ok := p.Children[0].Value.(int64)
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if !ok {
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return osm.NotMatchedError()
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}
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if respID != l.reqID {
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return osm.NotMatchedError()
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}
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if p.Children[1].Tag != ApplicationBindResponse {
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return osm.NotMatchedError()
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}
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return nil
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}
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func NewMatcher() osm.Matcher {
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m := &LDAPMatcher{}
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rand.Seed(time.Now().UnixNano())
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m.reqID = rand.Int63n(1000)
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p := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
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p.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, m.reqID, "MessageID"))
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bindRequest := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationBindRequest, nil, "Bind Request")
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bindRequest.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, 2, "Version"))
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bindRequest.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, "LOAFLEOVERFLOW", "User Name"))
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bindRequest.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimitive, 0, "LOAFLEOVERFLOW", "Password"))
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p.AppendChild(bindRequest)
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m.AddPacket(osm.NewPacket(p.Bytes(), len(p.Bytes())))
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return m
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}
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