/
packet.go
332 lines (298 loc) · 15 KB
/
packet.go
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package ldapserver
import (
"bufio"
"errors"
"fmt"
"log"
ber "github.com/vjeantet/asn1-ber"
)
type messagePacket struct {
Packet *ber.Packet
}
func (msg *messagePacket) getOperation() int {
return int(msg.Packet.Children[1].Tag)
}
func (msg *messagePacket) readMessage() (m Message, err error) {
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("invalid packet received hex=%x", msg.Packet.Bytes())
}
}()
m.MessageID = int(msg.Packet.Children[0].Value.(uint64))
switch msg.getOperation() {
case ApplicationBindRequest:
var br BindRequest
br.Login = msg.Packet.Children[1].Children[1].Data.Bytes()
br.Password = msg.Packet.Children[1].Children[2].Data.Bytes()
br.Version = int(msg.Packet.Children[1].Children[0].Value.(uint64))
m.protocolOp = br
return m, nil
case ApplicationUnbindRequest:
var ur UnbindRequest
m.protocolOp = ur
return m, nil
case ApplicationSearchRequest:
var sr SearchRequest
sr.BaseObject = msg.Packet.Children[1].Children[0].Data.Bytes()
sr.Scope = int(msg.Packet.Children[1].Children[1].Value.(uint64))
sr.DerefAliases = int(msg.Packet.Children[1].Children[2].Value.(uint64))
sr.SizeLimit = int(msg.Packet.Children[1].Children[3].Value.(uint64))
sr.TimeLimit = int(msg.Packet.Children[1].Children[4].Value.(uint64))
sr.TypesOnly = msg.Packet.Children[1].Children[5].Value.(bool)
var ldaperr error
sr.Filter, ldaperr = decompileFilter(msg.Packet.Children[1].Children[6])
if ldaperr != nil {
log.Printf("error decompiling searchrequestfilter %s", ldaperr)
}
for i := range msg.Packet.Children[1].Children[7].Children {
sr.Attributes = append(sr.Attributes, msg.Packet.Children[1].Children[7].Children[i].Data.Bytes())
}
m.protocolOp = sr
return m, nil
case ApplicationAddRequest:
var r AddRequest
r.entry = LDAPDN(msg.Packet.Children[1].Children[0].Data.Bytes())
for i := range msg.Packet.Children[1].Children[1].Children {
rattribute := Attribute{type_: AttributeDescription(msg.Packet.Children[1].Children[1].Children[i].Children[0].Data.Bytes())}
for j := range msg.Packet.Children[1].Children[1].Children[i].Children[1].Children {
rattribute.vals = append(rattribute.vals, AttributeValue(msg.Packet.Children[1].Children[1].Children[i].Children[1].Children[j].Data.Bytes()))
}
r.attributes = append(r.attributes, rattribute)
}
m.protocolOp = r
return m, nil
case ApplicationModifyRequest:
var r ModifyRequest
r.object = LDAPDN(msg.Packet.Children[1].Children[0].Data.Bytes())
for i := range msg.Packet.Children[1].Children[1].Children {
operation := int(msg.Packet.Children[1].Children[1].Children[i].Children[0].Value.(uint64))
attributeName := msg.Packet.Children[1].Children[1].Children[i].Children[1].Children[0].Value.(string)
modifyRequestChange := modifyRequestChange{operation: operation}
rattribute := PartialAttribute{type_: AttributeDescription(attributeName)}
for j := range msg.Packet.Children[1].Children[1].Children[i].Children[1].Children[1].Children {
value := msg.Packet.Children[1].Children[1].Children[i].Children[1].Children[1].Children[j].Value.(string)
rattribute.vals = append(rattribute.vals, AttributeValue(value))
}
modifyRequestChange.modification = rattribute
r.changes = append(r.changes, modifyRequestChange)
}
m.protocolOp = r
return m, nil
case ApplicationDelRequest:
var r DeleteRequest
r = DeleteRequest(msg.Packet.Children[1].Data.Bytes())
m.protocolOp = r
return m, nil
case ApplicationExtendedRequest:
var r ExtendedRequest
r.requestName = LDAPOID(msg.Packet.Children[1].Children[0].Data.Bytes())
if len(msg.Packet.Children[1].Children) > 1 {
r.requestValue = msg.Packet.Children[1].Children[1].Data.Bytes()
}
m.protocolOp = r
return m, nil
case ApplicationAbandonRequest:
var r AbandonRequest
r = AbandonRequest(msg.Packet.Children[1].Value.(uint64))
m.protocolOp = r
return m, nil
case ApplicationCompareRequest:
var r CompareRequest
r.entry = LDAPDN(msg.Packet.Children[1].Children[0].Value.(string))
r.ava = AttributeValueAssertion{
attributeDesc: AttributeDescription(msg.Packet.Children[1].Children[1].Children[0].Value.(string)),
assertionValue: AssertionValue(msg.Packet.Children[1].Children[1].Children[1].Value.(string))}
m.protocolOp = r
return m, nil
default:
return m, fmt.Errorf("unknow ldap operation [operation=%d]", msg.getOperation())
}
}
func decompileFilter(packet *ber.Packet) (ret string, err error) {
defer func() {
if r := recover(); r != nil {
err = errors.New("error decompiling filter")
}
}()
ret = "("
err = nil
childStr := ""
switch packet.Tag {
case FilterAnd:
ret += "&"
for _, child := range packet.Children {
childStr, err = decompileFilter(child)
if err != nil {
return
}
ret += childStr
}
case FilterOr:
ret += "|"
for _, child := range packet.Children {
childStr, err = decompileFilter(child)
if err != nil {
return
}
ret += childStr
}
case FilterNot:
ret += "!"
childStr, err = decompileFilter(packet.Children[0])
if err != nil {
return
}
ret += childStr
case FilterSubstrings:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += "="
switch packet.Children[1].Children[0].Tag {
case FilterSubstringsInitial:
ret += ber.DecodeString(packet.Children[1].Children[0].Data.Bytes()) + "*"
case FilterSubstringsAny:
ret += "*" + ber.DecodeString(packet.Children[1].Children[0].Data.Bytes()) + "*"
case FilterSubstringsFinal:
ret += "*" + ber.DecodeString(packet.Children[1].Children[0].Data.Bytes())
}
case FilterEqualityMatch:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += "="
ret += ber.DecodeString(packet.Children[1].Data.Bytes())
case FilterGreaterOrEqual:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += ">="
ret += ber.DecodeString(packet.Children[1].Data.Bytes())
case FilterLessOrEqual:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += "<="
ret += ber.DecodeString(packet.Children[1].Data.Bytes())
case FilterPresent:
if 0 == len(packet.Children) {
ret += ber.DecodeString(packet.Data.Bytes())
} else {
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
}
ret += "=*"
case FilterApproxMatch:
ret += ber.DecodeString(packet.Children[0].Data.Bytes())
ret += "~="
ret += ber.DecodeString(packet.Children[1].Data.Bytes())
}
ret += ")"
return
}
func readMessagePacket(br *bufio.Reader) (*messagePacket, error) {
p, err := ber.ReadPacket(br)
//ber.PrintPacket(p)
messagePacket := &messagePacket{Packet: p}
return messagePacket, err
}
func newMessagePacket(lr response) *ber.Packet {
switch v := lr.(type) {
case *BindResponse:
var b = lr.(*BindResponse)
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Response")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagInteger, uint64(b.MessageID), "MessageID"))
bindResponse := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationBindResponse, nil, "Bind Response")
bindResponse.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagEnumerated, uint64(b.ResultCode), "ResultCode"))
bindResponse.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(b.MatchedDN), "MatchedDN"))
bindResponse.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, b.DiagnosticMessage, "DiagnosticMessage"))
packet.AppendChild(bindResponse)
return packet
case *SearchResponse:
var res = lr.(*SearchResponse)
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Response")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagInteger, uint64(res.MessageID), "MessageID"))
searchResultDone := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationSearchResultDone, nil, "Search done")
searchResultDone.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagEnumerated, uint64(res.ResultCode), "ResultCode"))
searchResultDone.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(res.MatchedDN), "MatchedDN"))
searchResultDone.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, res.DiagnosticMessage, "DiagnosticMessage"))
packet.AppendChild(searchResultDone)
return packet
case *SearchResultEntry:
var s = lr.(*SearchResultEntry)
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Response")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagInteger, uint64(s.MessageID), "MessageID"))
searchResponse := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationSearchResultEntry, nil, "SearchResultEntry")
searchResponse.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, s.dN, "LDAPDN"))
attributesList := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "Attributes List")
for j := range s.attributes {
attributes := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "attributes")
attributes.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(s.attributes[j].GetDescription()), "type"))
values := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSet, nil, "values")
for k := range s.attributes[j].vals {
values.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(s.attributes[j].vals[k]), "val"))
}
attributes.AppendChild(values)
attributesList.AppendChild(attributes)
}
searchResponse.AppendChild(attributesList)
packet.AppendChild(searchResponse)
return packet
case *ExtendedResponse:
var b = lr.(*ExtendedResponse)
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Response")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagInteger, uint64(b.MessageID), "MessageID"))
extendedResponse := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationExtendedResponse, nil, "Extended Response")
extendedResponse.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagEnumerated, uint64(b.ResultCode), "ResultCode"))
extendedResponse.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(b.MatchedDN), "MatchedDN"))
extendedResponse.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, b.DiagnosticMessage, "DiagnosticMessage"))
extendedResponse.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimative, 10, string(b.ResponseName), "responsename"))
extendedResponse.AppendChild(ber.NewString(ber.ClassContext, ber.TypePrimative, 11, b.ResponseValue, "responsevalue"))
packet.AppendChild(extendedResponse)
return packet
case *AddResponse:
var res = lr.(*AddResponse)
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Response")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagInteger, uint64(res.MessageID), "MessageID"))
packet2 := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationAddResponse, nil, "Add response")
packet2.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagEnumerated, uint64(res.ResultCode), "ResultCode"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(res.MatchedDN), "MatchedDN"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, res.DiagnosticMessage, "DiagnosticMessage"))
packet.AppendChild(packet2)
return packet
case *DeleteResponse:
var res = lr.(*DeleteResponse)
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Response")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagInteger, uint64(res.MessageID), "MessageID"))
packet2 := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationDelResponse, nil, "Delete response")
packet2.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagEnumerated, uint64(res.ResultCode), "ResultCode"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(res.MatchedDN), "MatchedDN"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, res.DiagnosticMessage, "DiagnosticMessage"))
packet.AppendChild(packet2)
return packet
case *ModifyResponse:
var res = lr.(*ModifyResponse)
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Response")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagInteger, uint64(res.MessageID), "MessageID"))
packet2 := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationModifyResponse, nil, "Modify response")
packet2.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagEnumerated, uint64(res.ResultCode), "ResultCode"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(res.MatchedDN), "MatchedDN"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, res.DiagnosticMessage, "DiagnosticMessage"))
packet.AppendChild(packet2)
return packet
case *CompareResponse:
var res = lr.(*CompareResponse)
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Response")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagInteger, uint64(res.MessageID), "MessageID"))
packet2 := ber.Encode(ber.ClassApplication, ber.TypeConstructed, ApplicationCompareResponse, nil, "Compare response")
packet2.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagEnumerated, uint64(res.ResultCode), "ResultCode"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(res.MatchedDN), "MatchedDN"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, res.DiagnosticMessage, "DiagnosticMessage"))
packet.AppendChild(packet2)
return packet
case *ldapResult:
res := lr.(*ldapResult)
packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Response")
packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagInteger, uint64(res.MessageID), "MessageID"))
packet2 := ber.Encode(ber.ClassApplication, ber.TypeConstructed, 0, nil, "Common")
packet2.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimative, ber.TagEnumerated, uint64(res.ResultCode), "ResultCode"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, string(res.MatchedDN), "MatchedDN"))
packet2.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimative, ber.TagOctetString, res.DiagnosticMessage, "DiagnosticMessage"))
packet.AppendChild(packet2)
return packet
default:
log.Printf("newMessagePacket :: unexpected type %T", v)
}
return nil
}