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packet-ldap-template.c

/* packet-ldap.c
 * Routines for ldap packet dissection
 *
 * See RFC 1777 (LDAP v2), RFC 2251 (LDAP v3), and RFC 2222 (SASL).
 *
 * $Id: packet-ldap-template.c 19490 2006-10-11 08:18:14Z sahlberg $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/*
 * This is not a complete implementation. It doesn't handle the full version 3, more specifically,
 * it handles only the commands of version 2, but any additional characteristics of the ver3 command are supported.
 * It's also missing extensible search filters.
 *
 * There should probably be alot more error checking, I simply assume that if we have a full packet, it will be a complete
 * and correct packet.
 *
 * AFAIK, it will handle all messages used by the OpenLDAP 1.2.9 server and libraries which was my goal. I do plan to add
 * the remaining commands as time permits but this is not a priority to me. Send me an email if you need it and I'll see what
 * I can do.
 *
 * Doug Nazar
 * nazard@dragoninc.on.ca
 */

/*
 * 11/11/2002 - Fixed problem when decoding LDAP with desegmentation enabled and the
 *              ASN.1 BER Universal Class Tag: "Sequence Of" header is encapsulated across 2
 *              TCP segments.
 *
 * Ronald W. Henderson
 * ronald.henderson@cognicaseusa.com
 */

/*
 * 20-JAN-2004 - added decoding of MS-CLDAP netlogon RPC
 *               using information from the SNIA 2003 conference paper :
 *               Active Directory Domain Controller Location Service
 *                    by Anthony Liguori
 * ronnie sahlberg
 */

/*
 * 17-DEC-2004 - added basic decoding for LDAP Controls
 * 20-DEC-2004 - added handling for GSS-API encrypted blobs
 *
 * Stefan Metzmacher <metze@samba.org>
 *
 * 15-NOV-2005 - Changed to use the asn2wrs compiler
 * Anders Broman <anders.broman@ericsson.com>
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>
#include <string.h>
#include <ctype.h>

#include <glib.h>

#include <epan/packet.h>
#include <epan/conversation.h>
#include <epan/prefs.h>
#include <epan/tap.h>
#include <epan/emem.h>
#include <epan/oid_resolv.h>
#include <epan/strutil.h>
#include <epan/dissectors/packet-tcp.h>
#include <epan/dissectors/packet-windows-common.h>
#include <epan/dissectors/packet-dcerpc.h>

#include "packet-frame.h"
#include "packet-ldap.h"
#include "packet-ntlmssp.h"

#include "packet-ber.h"
#include "packet-per.h"

#define PNAME  "Lightweight-Directory-Access-Protocol"
#define PSNAME "LDAP"
#define PFNAME "ldap"

/* Initialize the protocol and registered fields */
static int ldap_tap = -1;
static int proto_ldap = -1;
static int proto_cldap = -1;

static int hf_ldap_sasl_buffer_length = -1;
static int hf_ldap_response_in = -1;
static int hf_ldap_response_to = -1;
static int hf_ldap_time = -1;
static int hf_ldap_guid = -1;

static int hf_mscldap_netlogon_type = -1;
static int hf_mscldap_netlogon_flags = -1;
static int hf_mscldap_netlogon_flags_pdc = -1;
static int hf_mscldap_netlogon_flags_gc = -1;
static int hf_mscldap_netlogon_flags_ldap = -1;
static int hf_mscldap_netlogon_flags_ds = -1;
static int hf_mscldap_netlogon_flags_kdc = -1;
static int hf_mscldap_netlogon_flags_timeserv = -1;
static int hf_mscldap_netlogon_flags_closest = -1;
static int hf_mscldap_netlogon_flags_writable = -1;
static int hf_mscldap_netlogon_flags_good_timeserv = -1;
static int hf_mscldap_netlogon_flags_ndnc = -1;
static int hf_mscldap_domain_guid = -1;
static int hf_mscldap_forest = -1;
static int hf_mscldap_domain = -1;
static int hf_mscldap_hostname = -1;
static int hf_mscldap_nb_domain = -1;
static int hf_mscldap_nb_hostname = -1;
static int hf_mscldap_username = -1;
static int hf_mscldap_sitename = -1;
static int hf_mscldap_clientsitename = -1;
static int hf_mscldap_netlogon_version = -1;
static int hf_mscldap_netlogon_lm_token = -1;
static int hf_mscldap_netlogon_nt_token = -1;
static int hf_ldap_sid = -1;
static int hf_ldap_AccessMask_ADS_CREATE_CHILD = -1;
static int hf_ldap_AccessMask_ADS_DELETE_CHILD = -1;
static int hf_ldap_AccessMask_ADS_LIST = -1;
static int hf_ldap_AccessMask_ADS_SELF_WRITE = -1;
static int hf_ldap_AccessMask_ADS_READ_PROP = -1;
static int hf_ldap_AccessMask_ADS_WRITE_PROP = -1;
static int hf_ldap_AccessMask_ADS_DELETE_TREE = -1;
static int hf_ldap_AccessMask_ADS_LIST_OBJECT = -1;
static int hf_ldap_AccessMask_ADS_CONTROL_ACCESS = -1;

#include "packet-ldap-hf.c"

/* Initialize the subtree pointers */
static gint ett_ldap = -1;
static gint ett_ldap_msg = -1;
static gint ett_ldap_sasl_blob = -1;
static guint ett_ldap_payload = -1;
static gint ett_mscldap_netlogon_flags = -1;

#include "packet-ldap-ett.c"

static dissector_table_t ldap_name_dissector_table=NULL;

/* desegmentation of LDAP */
static gboolean ldap_desegment = TRUE;
static guint    ldap_tcp_port = 389;
static guint    ldap_max_pdu_size = 65535;

static gboolean do_protocolop = FALSE;
static gchar    *attr_type = NULL;
static gboolean is_binary_attr_type = FALSE;

#define TCP_PORT_LDAP               389
#define UDP_PORT_CLDAP              389
#define TCP_PORT_GLOBALCAT_LDAP         3268 /* Windows 2000 Global Catalog */

static dissector_handle_t gssapi_handle;
static dissector_handle_t gssapi_wrap_handle;
static dissector_handle_t ntlmssp_handle = NULL;


/* different types of rpc calls ontop of ms cldap */
#define     MSCLDAP_RPC_NETLOGON    1

/* Message type Choice values */
static const value_string ldap_ProtocolOp_choice_vals[] = {
  {   0, "bindRequest" },
  {   1, "bindResponse" },
  {   2, "unbindRequest" },
  {   3, "searchRequest" },
  {   4, "searchResEntry" },
  {   5, "searchResDone" },
  {     6, "searchResRef" },
  {   7, "modifyRequest" },
  {   8, "modifyResponse" },
  {   9, "addRequest" },
  {  10, "addResponse" },
  {  11, "delRequest" },
  {  12, "delResponse" },
  {  13, "modDNRequest" },
  {  14, "modDNResponse" },
  {  15, "compareRequest" },
  {  16, "compareResponse" },
  {  17, "abandonRequest" },
  {  18, "extendedReq" },
  {  19, "extendedResp" },
  { 0, NULL }
};
/*
 * Data structure attached to a conversation, giving authentication
 * information from a bind request.
 * We keep a linked list of them, so that we can free up all the
 * authentication mechanism strings.
 */
typedef struct ldap_conv_info_t {
  struct ldap_conv_info_t *next;
  guint auth_type;            /* authentication type */
  char *auth_mech;            /* authentication mechanism */
  guint32 first_auth_frame;   /* first frame that would use a security layer */
  GHashTable *unmatched;
  GHashTable *matched;
  gboolean is_mscldap;
  guint32  num_results;
} ldap_conv_info_t;
static ldap_conv_info_t *ldap_info_items;

static guint
ldap_info_hash_matched(gconstpointer k)
{
  const ldap_call_response_t *key = k;

  return key->messageId;
}

static gint
ldap_info_equal_matched(gconstpointer k1, gconstpointer k2)
{
  const ldap_call_response_t *key1 = k1;
  const ldap_call_response_t *key2 = k2;

  if( key1->req_frame && key2->req_frame && (key1->req_frame!=key2->req_frame) ){
    return 0;
  }
  /* a response may span multiple frames
  if( key1->rep_frame && key2->rep_frame && (key1->rep_frame!=key2->rep_frame) ){
    return 0;
  }
  */

  return key1->messageId==key2->messageId;
}

static guint
ldap_info_hash_unmatched(gconstpointer k)
{
  const ldap_call_response_t *key = k;

  return key->messageId;
}

static gint
ldap_info_equal_unmatched(gconstpointer k1, gconstpointer k2)
{
  const ldap_call_response_t *key1 = k1;
  const ldap_call_response_t *key2 = k2;

  return key1->messageId==key2->messageId;
}

/* This string contains the last LDAPString that was decoded */
static char *attributedesc_string=NULL;

/* This string contains the last AssertionValue that was decoded */
static char *ldapvalue_string=NULL;

/* if the octet string contain all printable ASCII characters, then
 * display it as a string, othervise just display it in hex.
 */
static int
dissect_ldap_AssertionValue(gboolean implicit_tag, tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, int hf_index)
{
      gint8 class;
      gboolean pc, ind, is_ascii;
      gint32 tag;
      guint32 len, i;
      const guchar *str;

      if(!implicit_tag){
            offset=get_ber_identifier(tvb, offset, &class, &pc, &tag);
            offset=get_ber_length(NULL, tvb, offset, &len, &ind);
      } else {
            len=tvb_length_remaining(tvb,offset);
      }

      if(len==0){
            return offset;
      }


      /*
       * Some special/wellknown attributes in common LDAP (read AD)
       * are neither ascii strings nor blobs of hex data.
       * Special case these attributes and decode them more nicely.
       *
       * Add more special cases as required to prettify further
       * (there cant be that many ones that are truly interesting)
       */
      if(attributedesc_string && !strncmp("DomainSid", attributedesc_string, 9)){
            tvbuff_t *sid_tvb;
            char *tmpstr;

            /* this octet string contains an NT SID */
            sid_tvb=tvb_new_subset(tvb, offset, len, len);
            dissect_nt_sid(sid_tvb, 0, tree, "SID", &tmpstr, hf_index);
            ldapvalue_string=tmpstr;

            goto finished;
      } else if ( (len==16) /* GUIDs are always 16 bytes */
      && (attributedesc_string && !strncmp("DomainGuid", attributedesc_string, 10))) {
            guint8 drep[4] = { 0x10, 0x00, 0x00, 0x00}; /* fake DREP struct */
            e_uuid_t uuid;

            /* This octet string contained a GUID */
            dissect_dcerpc_uuid_t(tvb, offset, pinfo, tree, drep, hf_ldap_guid, &uuid);

            ldapvalue_string=ep_alloc(1024);
            g_snprintf(ldapvalue_string, 1023, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
                          uuid.Data1, uuid.Data2, uuid.Data3,
                          uuid.Data4[0], uuid.Data4[1],
                          uuid.Data4[2], uuid.Data4[3],
                          uuid.Data4[4], uuid.Data4[5],
                          uuid.Data4[6], uuid.Data4[7]);

            goto finished;
      }

      /*
       * It was not one of our "wellknown" attributes so make the best
       * we can and just try to see if it is an ascii string or if it
       * is a binary blob.
       *
       * XXX - should we support reading RFC 2252-style schemas
       * for LDAP, and using that to determine how to display
       * attribute values and assertion values?
       *
       * -- I dont think there are full schemas available that describe the
       *  interesting cases i.e. AD -- ronnie
       */
      str=tvb_get_ptr(tvb, offset, len);
      is_ascii=TRUE;
      for(i=0;i<len;i++){
            if(!isascii(str[i]) || !isprint(str[i])){
                  is_ascii=FALSE;
                  break;
            }
      }

      /* convert the string into a printable string */
      if(is_ascii){
            ldapvalue_string=ep_alloc(len+1);
            memcpy(ldapvalue_string,str,len);
            ldapvalue_string[i]=0;
      } else {
            ldapvalue_string=ep_alloc(3*len);
            for(i=0;i<len;i++){
                  g_snprintf(ldapvalue_string+i*3,3,"%02x",str[i]&0xff);
                  ldapvalue_string[3*i+2]=':';
            }
            ldapvalue_string[3*len-1]=0;
      }

      proto_tree_add_string(tree, hf_index, tvb, offset, len, ldapvalue_string);


finished:
      offset+=len;
      return offset;
}

/* This string contains the last Filter item that was decoded */
static char *Filter_string=NULL;
static char *and_filter_string=NULL;
static char *or_filter_string=NULL;
static char *substring_value=NULL;
static char *substring_item_init=NULL;
static char *substring_item_any=NULL;
static char *substring_item_final=NULL;
static char *matching_rule_string=NULL;
static gboolean matching_rule_dnattr=FALSE;

/* Global variables */
char *mechanism = NULL;
static gint MessageID =-1;
static gint ProtocolOp = -1;
static gint result = 0;
static proto_item *ldm_tree = NULL; /* item to add text to */

static void ldap_do_protocolop(packet_info *pinfo)
{
  const gchar* valstr;

  if (do_protocolop)  {

    valstr = val_to_str(ProtocolOp, ldap_ProtocolOp_choice_vals, "Unknown (%%u)");

    if(check_col(pinfo->cinfo, COL_INFO))
      col_append_fstr(pinfo->cinfo, COL_INFO, "%s(%u) ", valstr, MessageID);

    if(ldm_tree)
      proto_item_append_text(ldm_tree, " %s(%d)", valstr, MessageID);

    do_protocolop = FALSE;

  }
}

static ldap_call_response_t *
ldap_match_call_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint messageId, guint protocolOpTag)
{
  ldap_call_response_t lcr, *lcrp=NULL;
  ldap_conv_info_t *ldap_info = (ldap_conv_info_t *)pinfo->private_data;

  /* first see if we have already matched this */

      lcr.messageId=messageId;
      switch(protocolOpTag){
        case LDAP_REQ_BIND:
        case LDAP_REQ_SEARCH:
        case LDAP_REQ_MODIFY:
        case LDAP_REQ_ADD:
        case LDAP_REQ_DELETE:
        case LDAP_REQ_MODRDN:
        case LDAP_REQ_COMPARE:
          lcr.is_request=TRUE;
          lcr.req_frame=pinfo->fd->num;
          lcr.rep_frame=0;
          break;
        case LDAP_RES_BIND:
        case LDAP_RES_SEARCH_ENTRY:
        case LDAP_RES_SEARCH_REF:
        case LDAP_RES_SEARCH_RESULT:
        case LDAP_RES_MODIFY:
        case LDAP_RES_ADD:
        case LDAP_RES_DELETE:
        case LDAP_RES_MODRDN:
        case LDAP_RES_COMPARE:
          lcr.is_request=FALSE;
          lcr.req_frame=0;
          lcr.rep_frame=pinfo->fd->num;
          break;
      }
      lcrp=g_hash_table_lookup(ldap_info->matched, &lcr);

      if(lcrp){

        lcrp->is_request=lcr.is_request;

      } else {

              /* we haven't found a match - try and match it up */

  switch(protocolOpTag){
      case LDAP_REQ_BIND:
      case LDAP_REQ_SEARCH:
      case LDAP_REQ_MODIFY:
      case LDAP_REQ_ADD:
      case LDAP_REQ_DELETE:
      case LDAP_REQ_MODRDN:
      case LDAP_REQ_COMPARE:

            /* this a a request - add it to the unmatched list */

        /* check that we dont already have one of those in the
           unmatched list and if so remove it */

        lcr.messageId=messageId;
        lcrp=g_hash_table_lookup(ldap_info->unmatched, &lcr);
        if(lcrp){
          g_hash_table_remove(ldap_info->unmatched, lcrp);
        }
        /* if we cant reuse the old one, grab a new chunk */
        if(!lcrp){
          lcrp=se_alloc(sizeof(ldap_call_response_t));
        }
        lcrp->messageId=messageId;
        lcrp->req_frame=pinfo->fd->num;
        lcrp->req_time=pinfo->fd->abs_ts;
        lcrp->rep_frame=0;
        lcrp->protocolOpTag=protocolOpTag;
        lcrp->is_request=TRUE;
        g_hash_table_insert(ldap_info->unmatched, lcrp, lcrp);
        return NULL;
        break;
      case LDAP_RES_BIND:
      case LDAP_RES_SEARCH_ENTRY:
      case LDAP_RES_SEARCH_REF:
      case LDAP_RES_SEARCH_RESULT:
      case LDAP_RES_MODIFY:
      case LDAP_RES_ADD:
      case LDAP_RES_DELETE:
      case LDAP_RES_MODRDN:
      case LDAP_RES_COMPARE:

            /* this is a result - it should be in our unmatched list */

        lcr.messageId=messageId;
        lcrp=g_hash_table_lookup(ldap_info->unmatched, &lcr);

        if(lcrp){

          if(!lcrp->rep_frame){
            g_hash_table_remove(ldap_info->unmatched, lcrp);
            lcrp->rep_frame=pinfo->fd->num;
            lcrp->is_request=FALSE;
            g_hash_table_insert(ldap_info->matched, lcrp, lcrp);
          }
        }

        break;
        }

      }
    /* we have found a match */

    if(lcrp){
      proto_item *it;

      if(lcrp->is_request){
        it=proto_tree_add_uint(tree, hf_ldap_response_in, tvb, 0, 0, lcrp->rep_frame);
        PROTO_ITEM_SET_GENERATED(it);
      } else {
        nstime_t ns;
        it=proto_tree_add_uint(tree, hf_ldap_response_to, tvb, 0, 0, lcrp->req_frame);
        PROTO_ITEM_SET_GENERATED(it);
        nstime_delta(&ns, &pinfo->fd->abs_ts, &lcrp->req_time);
        it=proto_tree_add_time(tree, hf_ldap_time, tvb, 0, 0, &ns);
        PROTO_ITEM_SET_GENERATED(it);
      }
    }

    return lcrp;
}

#include "packet-ldap-fn.c"

static void
dissect_ldap_payload(tvbuff_t *tvb, packet_info *pinfo,
                 proto_tree *tree, ldap_conv_info_t *ldap_info,
                 gboolean rest_is_pad, gboolean is_mscldap)
{
  int offset = 0;
  guint length_remaining;
  guint msg_len = 0;
  int messageOffset = 0;
  guint headerLength = 0;
  guint length = 0;
  tvbuff_t *msg_tvb = NULL;
  gint8 class;
  gboolean pc, ind = 0;
  gint32 ber_tag;

    length_remaining = tvb_ensure_length_remaining(tvb, offset);

    if (rest_is_pad && length_remaining < 6) return;

    /*
     * OK, try to read the "Sequence Of" header; this gets the total
     * length of the LDAP message.
     */
      messageOffset = get_ber_identifier(tvb, offset, &class, &pc, &ber_tag);
      messageOffset = get_ber_length(tree, tvb, messageOffset, &msg_len, &ind);

    if (ber_tag == BER_UNI_TAG_SEQUENCE) {
            /*
             * Add the length of the "Sequence Of" header to the message
             * length.
             */
            headerLength = messageOffset - offset;
            msg_len += headerLength;
        if (msg_len < headerLength) {
          /*
           * The message length was probably so large that the total length
           * overflowed.
           *
           * Report this as an error.
           */
          show_reported_bounds_error(tvb, pinfo, tree);
          return;
        }
    } else {
            /*
             * We couldn't parse the header; just make it the amount of data
             * remaining in the tvbuff, so we'll give up on this segment
             * after attempting to parse the message - there's nothing more
             * we can do.  "dissect_ldap_message()" will display the error.
             */
            msg_len = length_remaining;
    }

    /*
     * Construct a tvbuff containing the amount of the payload we have
     * available.  Make its reported length the amount of data in the
     * LDAP message.
     *
     * XXX - if reassembly isn't enabled. the subdissector will throw a
     * BoundsError exception, rather than a ReportedBoundsError exception.
     * We really want a tvbuff where the length is "length", the reported
     * length is "plen", and the "if the snapshot length were infinite"
     * length is the minimum of the reported length of the tvbuff handed
     * to us and "plen", with a new type of exception thrown if the offset
     * is within the reported length but beyond that third length, with
     * that exception getting the "Unreassembled Packet" error.
     */
    length = length_remaining;
    if (length > msg_len) length = msg_len;
    msg_tvb = tvb_new_subset(tvb, offset, length, msg_len);

    /*
     * Now dissect the LDAP message.
     */

      ldap_info->is_mscldap = is_mscldap;
      pinfo->private_data = ldap_info;
      dissect_LDAPMessage_PDU(msg_tvb, pinfo, tree);


    offset += msg_len;

}

static void
dissect_ldap_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gboolean is_mscldap)
{
  int offset = 0;
  conversation_t *conversation;
  gboolean doing_sasl_security = FALSE;
  guint length_remaining;
  ldap_conv_info_t *ldap_info = NULL;
  proto_item *ldap_item = NULL;
  proto_tree *ldap_tree = NULL;

  ldm_tree = NULL;

  /*
   * Do we have a conversation for this connection?
   */
  conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
                                   pinfo->ptype, pinfo->srcport,
                                   pinfo->destport, 0);
  if (conversation == NULL) {
    /* We don't yet have a conversation, so create one. */
    conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
                                  pinfo->ptype, pinfo->srcport,
                                    pinfo->destport, 0);

  }

  /*
   * Do we already have a type and mechanism?
   */
  ldap_info = conversation_get_proto_data(conversation, proto_ldap);
  if (ldap_info == NULL) {
    /* No.  Attach that information to the conversation, and add
     * it to the list of information structures.
     */
    ldap_info = se_alloc(sizeof(ldap_conv_info_t));
    ldap_info->auth_type = 0;
    ldap_info->auth_mech = 0;
    ldap_info->first_auth_frame = 0;
    ldap_info->matched=g_hash_table_new(ldap_info_hash_matched, ldap_info_equal_matched);
    ldap_info->unmatched=g_hash_table_new(ldap_info_hash_unmatched, ldap_info_equal_unmatched);
    ldap_info->num_results = 0;

    conversation_add_proto_data(conversation, proto_ldap, ldap_info);

    ldap_info->next = ldap_info_items;
    ldap_info_items = ldap_info;

  }

  switch (ldap_info->auth_type) {
    case LDAP_AUTH_SASL:
    /*
     * It's SASL; are we using a security layer?
     */
    if (ldap_info->first_auth_frame != 0 &&
       pinfo->fd->num >= ldap_info->first_auth_frame) {
      doing_sasl_security = TRUE;   /* yes */
    }
  }

    length_remaining = tvb_ensure_length_remaining(tvb, offset);

    /* It might still be a packet containing a SASL security layer
     * but its just that we never saw the BIND packet.
     * check if it looks like it could be a SASL blob here
     * and in that case just assume it is GSS-SPNEGO
     */
    if(!doing_sasl_security && (tvb_bytes_exist(tvb, offset, 5))
      &&(tvb_get_ntohl(tvb, offset)<=(guint)(tvb_reported_length_remaining(tvb, offset)-4))
      &&(tvb_get_guint8(tvb, offset+4)==0x60) ){
        ldap_info->auth_type=LDAP_AUTH_SASL;
        ldap_info->first_auth_frame=pinfo->fd->num;
        ldap_info->auth_mech=g_strdup("GSS-SPNEGO");
        doing_sasl_security=TRUE;
    }

    /*
     * This is the first PDU, set the Protocol column and clear the
     * Info column.
     */
    if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, pinfo->current_proto);
    if (check_col(pinfo->cinfo, COL_INFO)) col_clear(pinfo->cinfo, COL_INFO);

    ldap_item = proto_tree_add_item(tree, is_mscldap?proto_cldap:proto_ldap, tvb, 0, -1, FALSE);
    ldap_tree = proto_item_add_subtree(ldap_item, ett_ldap);

    /*
     * Might we be doing a SASL security layer and, if so, *are* we doing
     * one?
     *
     * Just because we've seen a bind reply for SASL, that doesn't mean
     * that we're using a SASL security layer; I've seen captures in
     * which some SASL negotiations lead to a security layer being used
     * and other negotiations don't, and it's not obvious what's different
     * in the two negotiations.  Therefore, we assume that if the first
     * byte is 0, it's a length for a SASL security layer (that way, we
     * never reassemble more than 16 megabytes, protecting us from
     * chewing up *too* much memory), and otherwise that it's an LDAP
     * message (actually, if it's an LDAP message it should begin with 0x30,
     * but we want to parse garbage as LDAP messages rather than really
     * huge lengths).
     */

    if (doing_sasl_security && tvb_get_guint8(tvb, offset) == 0) {
      proto_item *sasl_item = NULL;
      proto_tree *sasl_tree = NULL;
      tvbuff_t *sasl_tvb;
      guint sasl_len, sasl_msg_len, length;
      /*
       * Yes.  The frame begins with a 4-byte big-endian length.
       * And we know we have at least 6 bytes
       */

      /*
       * Get the SASL length, which is the length of data in the buffer
       * following the length (i.e., it's 4 less than the total length).
       *
       * XXX - do we need to reassemble buffers?  For now, we
       * assume that each LDAP message is entirely contained within
       * a buffer.
       */
      sasl_len = tvb_get_ntohl(tvb, offset);
      sasl_msg_len = sasl_len + 4;
      if (sasl_msg_len < 4) {
        /*
         * The message length was probably so large that the total length
       * overflowed.
         *
         * Report this as an error.
         */
        show_reported_bounds_error(tvb, pinfo, tree);
        return;
      }

      /*
       * Construct a tvbuff containing the amount of the payload we have
       * available.  Make its reported length the amount of data in the PDU.
       *
       * XXX - if reassembly isn't enabled. the subdissector will throw a
       * BoundsError exception, rather than a ReportedBoundsError exception.
       * We really want a tvbuff where the length is "length", the reported
       * length is "plen", and the "if the snapshot length were infinite"
       * length is the minimum of the reported length of the tvbuff handed
       * to us and "plen", with a new type of exception thrown if the offset
       * is within the reported length but beyond that third length, with
       * that exception getting the "Unreassembled Packet" error.
       */
      length = length_remaining;
      if (length > sasl_msg_len) length = sasl_msg_len;
      sasl_tvb = tvb_new_subset(tvb, offset, length, sasl_msg_len);

      if (ldap_tree) {
        proto_tree_add_uint(ldap_tree, hf_ldap_sasl_buffer_length, sasl_tvb, 0, 4,
                            sasl_len);

        sasl_item = proto_tree_add_text(ldap_tree, sasl_tvb, 0,  sasl_msg_len, "SASL buffer");
        sasl_tree = proto_item_add_subtree(sasl_item, ett_ldap_sasl_blob);
      }

      if (ldap_info->auth_mech != NULL &&
          strcmp(ldap_info->auth_mech, "GSS-SPNEGO") == 0) {
        tvbuff_t *gssapi_tvb, *plain_tvb = NULL, *decr_tvb= NULL;
        int ver_len;
        int length;

          /*
           * This is GSS-API (using SPNEGO, but we should be done with
           * the negotiation by now).
           *
           * Dissect the GSS_Wrap() token; it'll return the length of
           * the token, from which we compute the offset in the tvbuff at
           * which the plaintext data, i.e. the LDAP message, begins.
           */
          length = tvb_length_remaining(sasl_tvb, 4);
          if ((guint)length > sasl_len)
              length = sasl_len;
        gssapi_tvb = tvb_new_subset(sasl_tvb, 4, length, sasl_len);

        /* Attempt decryption of the GSSAPI wrapped data if possible */
        pinfo->decrypt_gssapi_tvb=DECRYPT_GSSAPI_NORMAL;
        pinfo->gssapi_wrap_tvb=NULL;
        pinfo->gssapi_encrypted_tvb=NULL;
        pinfo->gssapi_decrypted_tvb=NULL;
          ver_len = call_dissector(gssapi_wrap_handle, gssapi_tvb, pinfo, sasl_tree);
        /* if we could unwrap, do a tvb shuffle */
        if(pinfo->gssapi_decrypted_tvb){
            decr_tvb=pinfo->gssapi_decrypted_tvb;
        }
        /* tidy up */
        pinfo->decrypt_gssapi_tvb=0;
        pinfo->gssapi_wrap_tvb=NULL;
        pinfo->gssapi_encrypted_tvb=NULL;
        pinfo->gssapi_decrypted_tvb=NULL;

          /*
           * if len is 0 it probably mean that we got a PDU that is not
           * aligned to the start of the segment.
           */
          if(ver_len==0){
             return;
          }

        /*
         * if we don't have unwrapped data,
         * see if the wrapping involved encryption of the
         * data; if not, just use the plaintext data.
         */
        if (!decr_tvb) {
          if(!pinfo->gssapi_data_encrypted){
            plain_tvb = tvb_new_subset(gssapi_tvb,  ver_len, -1, -1);
          }
        }

          if (decr_tvb) {
          proto_item *enc_item = NULL;
          proto_tree *enc_tree = NULL;

            /*
             * The LDAP message was encrypted in the packet, and has
             * been decrypted; dissect the decrypted LDAP message.
             */
            if (sasl_tree) {
            enc_item = proto_tree_add_text(sasl_tree, gssapi_tvb, ver_len, -1,
                                "GSS-API Encrypted payload (%d byte%s)",
                                sasl_len - ver_len,
                                plurality(sasl_len - ver_len, "", "s"));
            enc_tree = proto_item_add_subtree(enc_item, ett_ldap_payload);
            }
          dissect_ldap_payload(decr_tvb, pinfo, enc_tree, ldap_info, TRUE, is_mscldap);
          } else if (plain_tvb) {
          proto_item *plain_item = NULL;
          proto_tree *plain_tree = NULL;

          /*
           * The LDAP message wasn't encrypted in the packet;
           * dissect the plain LDAP message.
             */
          if (sasl_tree) {
              plain_item = proto_tree_add_text(sasl_tree, gssapi_tvb, ver_len, -1,
                                "GSS-API payload (%d byte%s)",
                                sasl_len - ver_len,
                                plurality(sasl_len - ver_len, "", "s"));
            plain_tree = proto_item_add_subtree(plain_item, ett_ldap_payload);
            }

           dissect_ldap_payload(plain_tvb, pinfo, plain_tree, ldap_info, TRUE, is_mscldap);
        } else {
            /*
             * The LDAP message was encrypted in the packet, and was
             * not decrypted; just show it as encrypted data.
             */
            if (check_col(pinfo->cinfo, COL_INFO)) {
                col_add_fstr(pinfo->cinfo, COL_INFO, "LDAP GSS-API Encrypted payload (%d byte%s)",
                                 sasl_len - ver_len,
                                 plurality(sasl_len - ver_len, "", "s"));
            }
          if (sasl_tree) {
              proto_tree_add_text(sasl_tree, gssapi_tvb, ver_len, -1,
                                "GSS-API Encrypted payload (%d byte%s)",
                                sasl_len - ver_len,
                                plurality(sasl_len - ver_len, "", "s"));
          }
          }
      }
      offset += sasl_msg_len;
    } else {
      /* plain LDAP, so dissect the payload */
      dissect_ldap_payload(tvb, pinfo, ldap_tree, ldap_info, FALSE, is_mscldap);
    }
}

static int dissect_mscldap_string(tvbuff_t *tvb, int offset, char *str, int maxlen, gboolean prepend_dot)
{
  guint8 len;

  len=tvb_get_guint8(tvb, offset);
  offset+=1;
  *str=0;

  while(len){
    /* add potential field separation dot */
    if(prepend_dot){
      if(!maxlen){
        *str=0;
        return offset;
      }
      maxlen--;
      *str++='.';
      *str=0;
    }

    if(len==0xc0){
      int new_offset;
      /* ops its a mscldap compressed string */

      new_offset=tvb_get_guint8(tvb, offset);
      if (new_offset == offset - 1)
        THROW(ReportedBoundsError);
      offset+=1;

      dissect_mscldap_string(tvb, new_offset, str, maxlen, FALSE);

      return offset;
    }

    prepend_dot=TRUE;

    if(maxlen<=len){
      if(maxlen>3){
        *str++='.';
        *str++='.';
        *str++='.';
      }
      *str=0;
      return offset; /* will mess up offset in caller, is unlikely */
    }
    tvb_memcpy(tvb, str, offset, len);
    str+=len;
    *str=0;
    maxlen-=len;
    offset+=len;


    len=tvb_get_guint8(tvb, offset);
    offset+=1;
  }
  *str=0;
  return offset;
}

/* These flag bits were found to be defined in the samba sources.
 * I hope they are correct (but have serious doubts about the CLOSEST
 * bit being used or being meaningful).
 */
static const true_false_string tfs_ads_pdc = {
      "This is a PDC",
      "This is NOT a pdc"
};
static const true_false_string tfs_ads_gc = {
      "This is a GLOBAL CATALOGUE of forest",
      "This is NOT a global catalog of forest"
};
static const true_false_string tfs_ads_ldap = {
      "This is an LDAP server",
      "This is NOT an ldap server"
};
static const true_false_string tfs_ads_ds = {
      "This dc supports DS",
      "This dc does NOT support ds"
};
static const true_false_string tfs_ads_kdc = {
      "This is a KDC (kerberos)",
      "This is NOT a kdc (kerberos)"
};
static const true_false_string tfs_ads_timeserv = {
      "This dc is running TIME SERVICES (ntp)",
      "This dc is NOT running time services (ntp)"
};
static const true_false_string tfs_ads_closest = {
      "This is the CLOSEST dc (unreliable?)",
      "This is NOT the closest dc"
};
static const true_false_string tfs_ads_writable = {
      "This dc is WRITABLE",
      "This dc is NOT writable"
};
static const true_false_string tfs_ads_good_timeserv = {
      "This dc has a GOOD TIME SERVICE (i.e. hardware clock)",
      "This dc does NOT have a good time service (i.e. no hardware clock)"
};
static const true_false_string tfs_ads_ndnc = {
      "Domain is NON-DOMAIN NC serviced by ldap server",
      "Domain is NOT non-domain nc serviced by ldap server"
};
static int dissect_mscldap_netlogon_flags(proto_tree *parent_tree, tvbuff_t *tvb, int offset)
{
  guint32 flags;
  proto_item *item;
  proto_tree *tree=NULL;
  guint fields[] = { hf_mscldap_netlogon_flags_ndnc,
                 hf_mscldap_netlogon_flags_good_timeserv,
                 hf_mscldap_netlogon_flags_writable,
                 hf_mscldap_netlogon_flags_closest,
                 hf_mscldap_netlogon_flags_timeserv,
                 hf_mscldap_netlogon_flags_kdc,
                 hf_mscldap_netlogon_flags_ds,
                 hf_mscldap_netlogon_flags_ldap,
                 hf_mscldap_netlogon_flags_gc,
                 hf_mscldap_netlogon_flags_pdc,
                 0 };
  guint  *field;
  header_field_info *hfi;
  gboolean one_bit_set = FALSE;

  flags=tvb_get_letohl(tvb, offset);
  item=proto_tree_add_item(parent_tree, hf_mscldap_netlogon_flags, tvb, offset, 4, TRUE);
  if(parent_tree){
    tree = proto_item_add_subtree(item, ett_mscldap_netlogon_flags);
  }

  proto_item_append_text(item, " (");

  for(field = fields; *field; field++) {
    proto_tree_add_boolean(tree, *field, tvb, offset, 4, flags);
    hfi = proto_registrar_get_nth(*field);

    if(flags & hfi->bitmask) {

      if(one_bit_set)
      proto_item_append_text(item, ", ");
      else
      one_bit_set = TRUE;

      proto_item_append_text(item, hfi->name);

    }
  }

  proto_item_append_text(item, ")");

  offset += 4;

  return offset;
}

static void dissect_NetLogon_PDU(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
  int old_offset, offset=0;
  char str[256];

  ldm_tree = NULL;

/*qqq*/

  /* Type */
  /*XXX someone that knows what the type means should add that knowledge here*/
  proto_tree_add_item(tree, hf_mscldap_netlogon_type, tvb, offset, 4, TRUE);
  offset += 4;

  /* Flags */
  offset = dissect_mscldap_netlogon_flags(tree, tvb, offset);

  /* Domain GUID */
  proto_tree_add_item(tree, hf_mscldap_domain_guid, tvb, offset, 16, TRUE);
  offset += 16;

  /* Forest */
  old_offset=offset;
  offset=dissect_mscldap_string(tvb, offset, str, 255, FALSE);
  proto_tree_add_string(tree, hf_mscldap_forest, tvb, old_offset, offset-old_offset, str);

  /* Domain */
  old_offset=offset;
  offset=dissect_mscldap_string(tvb, offset, str, 255, FALSE);
  proto_tree_add_string(tree, hf_mscldap_domain, tvb, old_offset, offset-old_offset, str);

  /* Hostname */
  old_offset=offset;
  offset=dissect_mscldap_string(tvb, offset, str, 255, FALSE);
  proto_tree_add_string(tree, hf_mscldap_hostname, tvb, old_offset, offset-old_offset, str);

  /* NetBios Domain */
  old_offset=offset;
  offset=dissect_mscldap_string(tvb, offset, str, 255, FALSE);
  proto_tree_add_string(tree, hf_mscldap_nb_domain, tvb, old_offset, offset-old_offset, str);

  /* NetBios Hostname */
  old_offset=offset;
  offset=dissect_mscldap_string(tvb, offset, str, 255, FALSE);
  proto_tree_add_string(tree, hf_mscldap_nb_hostname, tvb, old_offset, offset-old_offset, str);

  /* User */
  old_offset=offset;
  offset=dissect_mscldap_string(tvb, offset, str, 255, FALSE);
  proto_tree_add_string(tree, hf_mscldap_username, tvb, old_offset, offset-old_offset, str);

  /* Site */
  old_offset=offset;
  offset=dissect_mscldap_string(tvb, offset, str, 255, FALSE);
  proto_tree_add_string(tree, hf_mscldap_sitename, tvb, old_offset, offset-old_offset, str);

  /* Client Site */
  old_offset=offset;
  offset=dissect_mscldap_string(tvb, offset, str, 255, FALSE);
  proto_tree_add_string(tree, hf_mscldap_clientsitename, tvb, old_offset, offset-old_offset, str);

  /* Version */
  proto_tree_add_item(tree, hf_mscldap_netlogon_version, tvb, offset, 4, TRUE);
  offset += 4;

  /* LM Token */
  proto_tree_add_item(tree, hf_mscldap_netlogon_lm_token, tvb, offset, 2, TRUE);
  offset += 2;

  /* NT Token */
  proto_tree_add_item(tree, hf_mscldap_netlogon_nt_token, tvb, offset, 2, TRUE);
  offset += 2;

}


static guint
get_sasl_ldap_pdu_len(tvbuff_t *tvb, int offset)
{
      /* sasl encapsulated ldap is 4 bytes plus the length in size */
      return tvb_get_ntohl(tvb, offset)+4;
}

static void
dissect_sasl_ldap_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      dissect_ldap_pdu(tvb, pinfo, tree, FALSE);
      return;
}

static guint
get_normal_ldap_pdu_len(tvbuff_t *tvb, int offset)
{
      guint32 len;
      gboolean ind;
      int data_offset;

      /* normal ldap is tag+len bytes plus the length
       * offset is where the tag is
       * offset+1 is where length starts
       */
      data_offset=get_ber_length(NULL, tvb, offset+1, &len, &ind);
      return len+data_offset-offset;
}

static void
dissect_normal_ldap_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      dissect_ldap_pdu(tvb, pinfo, tree, FALSE);
      return;
}

static void
dissect_ldap_oid(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      char *oid;
      const char *oidname;

      /* tvb here contains an ascii string that is really an oid */
/* XXX   we should convert the string oid into a real oid so we can use
 *       proto_tree_add_oid() instead.
 */

      oid=tvb_get_ephemeral_string(tvb, 0, tvb_length(tvb));
      if(!oid){
            return;
      }

      oidname=get_oid_str_name(oid);

      if(oidname){
            proto_tree_add_text(tree, tvb, 0, tvb_length(tvb), "OID: %s (%s)",oid,oidname);
      } else {
            proto_tree_add_text(tree, tvb, 0, tvb_length(tvb), "OID: %s",oid);
      }
}

#define LDAP_ACCESSMASK_ADS_CREATE_CHILD  0x00000001
static const true_false_string ldap_AccessMask_ADS_CREATE_CHILD_tfs = {
   "ADS CREATE CHILD is SET",
   "Ads create child is NOT set",
};

#define LDAP_ACCESSMASK_ADS_DELETE_CHILD  0x00000002
static const true_false_string ldap_AccessMask_ADS_DELETE_CHILD_tfs = {
   "ADS DELETE CHILD is SET",
   "Ads delete child is NOT set",
};
#define LDAP_ACCESSMASK_ADS_LIST          0x00000004
static const true_false_string ldap_AccessMask_ADS_LIST_tfs = {
   "ADS LIST is SET",
   "Ads list is NOT set",
};
#define LDAP_ACCESSMASK_ADS_SELF_WRITE          0x00000008
static const true_false_string ldap_AccessMask_ADS_SELF_WRITE_tfs = {
   "ADS SELF WRITE is SET",
   "Ads self write is NOT set",
};
#define LDAP_ACCESSMASK_ADS_READ_PROP           0x00000010
static const true_false_string ldap_AccessMask_ADS_READ_PROP_tfs = {
   "ADS READ PROP is SET",
   "Ads read prop is NOT set",
};
#define LDAP_ACCESSMASK_ADS_WRITE_PROP          0x00000020
static const true_false_string ldap_AccessMask_ADS_WRITE_PROP_tfs = {
   "ADS WRITE PROP is SET",
   "Ads write prop is NOT set",
};
#define LDAP_ACCESSMASK_ADS_DELETE_TREE         0x00000040
static const true_false_string ldap_AccessMask_ADS_DELETE_TREE_tfs = {
   "ADS DELETE TREE is SET",
   "Ads delete tree is NOT set",
};
#define LDAP_ACCESSMASK_ADS_LIST_OBJECT         0x00000080
static const true_false_string ldap_AccessMask_ADS_LIST_OBJECT_tfs = {
   "ADS LIST OBJECT is SET",
   "Ads list object is NOT set",
};
#define LDAP_ACCESSMASK_ADS_CONTROL_ACCESS      0x00000100
static const true_false_string ldap_AccessMask_ADS_CONTROL_ACCESS_tfs = {
   "ADS CONTROL ACCESS is SET",
   "Ads control access is NOT set",
};

static void
ldap_specific_rights(tvbuff_t *tvb, gint offset, proto_tree *tree, guint32 access)
{
      proto_tree_add_boolean(tree, hf_ldap_AccessMask_ADS_CONTROL_ACCESS, tvb, offset, 4, access);

      proto_tree_add_boolean(tree, hf_ldap_AccessMask_ADS_LIST_OBJECT, tvb, offset, 4, access);

      proto_tree_add_boolean(tree, hf_ldap_AccessMask_ADS_DELETE_TREE, tvb, offset, 4, access);

      proto_tree_add_boolean(tree, hf_ldap_AccessMask_ADS_WRITE_PROP, tvb, offset, 4, access);

      proto_tree_add_boolean(tree, hf_ldap_AccessMask_ADS_READ_PROP, tvb, offset, 4, access);

      proto_tree_add_boolean(tree, hf_ldap_AccessMask_ADS_SELF_WRITE, tvb, offset, 4, access);

      proto_tree_add_boolean(tree, hf_ldap_AccessMask_ADS_LIST, tvb, offset, 4, access);

      proto_tree_add_boolean(tree, hf_ldap_AccessMask_ADS_DELETE_CHILD, tvb, offset, 4, access);

      proto_tree_add_boolean(tree, hf_ldap_AccessMask_ADS_CREATE_CHILD, tvb, offset, 4, access);
}
struct access_mask_info ldap_access_mask_info = {
      "LDAP",                 /* Name of specific rights */
      ldap_specific_rights,   /* Dissection function */
      NULL,             /* Generic mapping table */
      NULL              /* Standard mapping table */
};

static void
dissect_ldap_nt_sec_desc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      dissect_nt_sec_desc(tvb, 0, pinfo, tree, NULL, TRUE, tvb_length(tvb), &ldap_access_mask_info);
}

static void
dissect_ldap_sid(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      char *tmpstr;

      /* this octet string contains an NT SID */
      dissect_nt_sid(tvb, 0, tree, "SID", &tmpstr, hf_ldap_sid);
      ldapvalue_string=tmpstr;
}

static void
dissect_ldap_guid(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      guint8 drep[4] = { 0x10, 0x00, 0x00, 0x00}; /* fake DREP struct */
      e_uuid_t uuid;

      /* This octet string contained a GUID */
      dissect_dcerpc_uuid_t(tvb, 0, pinfo, tree, drep, hf_ldap_guid, &uuid);

      ldapvalue_string=ep_alloc(1024);
      g_snprintf(ldapvalue_string, 1023, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
                   uuid.Data1, uuid.Data2, uuid.Data3,
                   uuid.Data4[0], uuid.Data4[1],
                   uuid.Data4[2], uuid.Data4[3],
                   uuid.Data4[4], uuid.Data4[5],
                   uuid.Data4[6], uuid.Data4[7]);
}

static void
dissect_ldap_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      guint32 sasl_len;
      guint32 gss_len;
      guint32 ldap_len;
      int offset;
      gboolean ind;

        ldm_tree = NULL;

      /* This is a bit tricky. We have to find out whether SASL is used
       * so that we know how big a header we are supposed to pass
       * to tcp_dissect_pdus()
       */
      /* check for a SASL header, i.e. assume it is SASL if 
       * 1, first four bytes (SASL length) is an integer 
       *    with a value that must be <64k and >2
       *    (>2 to fight false positives, 0x00000000 is a common
       *        "random" tcp payload)
       * (no SASL ldap PDUs are ever going to be >64k in size?)
       *
       * Following the SASL header is a GSSAPI blob so the next byte
       * is always 0x60. (only true for MS SASL LDAP, there are other
       * blobs that may follow in real-world)
       *
       * 2, Then one byte with the value 0x60 indicating the GSSAPI blob
       *
       * 3, Then X bytes describing the BER encoded lengtyh of the blob.
       *    This length should point to the same end-of-pdu as 1,
       *
       * 4, finally a byte 0x06 indicating that the next object is an OID
       */
      sasl_len=tvb_get_ntohl(tvb, 0);
 
      if( (sasl_len>ldap_max_pdu_size) 
      ||  (sasl_len<2) ){
            goto this_was_not_sasl;
      }

      if(tvb_get_guint8(tvb, 4)!=0x60){
            goto this_was_not_sasl;
      }
            
      offset=get_ber_length(NULL, tvb, 5, &gss_len, &ind);
      if(sasl_len!=(gss_len+offset-4)){
            goto this_was_not_sasl;
      }

      if(tvb_get_guint8(tvb, offset)!=0x06){
            goto this_was_not_sasl;
      }

      tcp_dissect_pdus(tvb, pinfo, tree, ldap_desegment, 4, get_sasl_ldap_pdu_len, dissect_sasl_ldap_pdu);


this_was_not_sasl:
      /* check if it is a normal BER encoded LDAP packet
       * i.e. first byte is 0x30 followed by a length that is
       * <64k
       * (no ldap PDUs are ever >64kb? )
       */
      if(tvb_get_guint8(tvb, 0)!=0x30){
            goto this_was_not_normal_ldap;
      }

      /* check that length makes sense */
      offset=get_ber_length(NULL, tvb, 1, &ldap_len, &ind);

      /* dont check ind since indefinite length is never used for ldap (famous last words)*/
      if(ldap_len<2 || ldap_len>ldap_max_pdu_size){
            goto this_was_not_normal_ldap;
      }

      tcp_dissect_pdus(tvb, pinfo, tree, ldap_desegment, 4, get_normal_ldap_pdu_len, dissect_normal_ldap_pdu);


this_was_not_normal_ldap:

      return;
}

static void
dissect_mscldap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      dissect_ldap_pdu(tvb, pinfo, tree, TRUE);
      return;
}


static void
ldap_reinit(void)
{
  ldap_conv_info_t *ldap_info;

  /* Free up state attached to the ldap_info structures */
  for (ldap_info = ldap_info_items; ldap_info != NULL; ldap_info = ldap_info->next) {
    if (ldap_info->auth_mech != NULL) {
      g_free(ldap_info->auth_mech);
      ldap_info->auth_mech=NULL;
    }
    g_hash_table_destroy(ldap_info->matched);
    ldap_info->matched=NULL;
    g_hash_table_destroy(ldap_info->unmatched);
    ldap_info->unmatched=NULL;
  }

  ldap_info_items = NULL;

}

void
register_ldap_name_dissector_handle(const char *attr_type, dissector_handle_t dissector)
{
      dissector_add_string("ldap.name", attr_type, dissector);
}

void
register_ldap_name_dissector(const char *attr_type, dissector_t dissector, int proto)
{
      dissector_handle_t dissector_handle;

      dissector_handle=create_dissector_handle(dissector, proto);
      register_ldap_name_dissector_handle(attr_type, dissector_handle);
}


/*--- proto_register_ldap -------------------------------------------*/
void proto_register_ldap(void) {

  /* List of fields */

  static hf_register_info hf[] = {

            { &hf_ldap_sasl_buffer_length,
              { "SASL Buffer Length",     "ldap.sasl_buffer_length",
                  FT_UINT32, BASE_DEC, NULL, 0x0,
                  "SASL Buffer Length", HFILL }},
          { &hf_ldap_response_in,
            { "Response In", "ldap.response_in",
              FT_FRAMENUM, BASE_DEC, NULL, 0x0,
              "The response to this LDAP request is in this frame", HFILL }},
          { &hf_ldap_response_to,
            { "Response To", "ldap.response_to",
              FT_FRAMENUM, BASE_DEC, NULL, 0x0,
              "This is a response to the LDAP request in this frame", HFILL }},
          { &hf_ldap_time,
            { "Time", "ldap.time",
              FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
              "The time between the Call and the Reply", HFILL }},

    { &hf_mscldap_netlogon_type,
      { "Type", "mscldap.netlogon.type",
        FT_UINT32, BASE_DEC, NULL, 0x0,
        "Type of <please tell Wireshark developers what this type is>", HFILL }},

    { &hf_mscldap_netlogon_version,
      { "Version", "mscldap.netlogon.version",
        FT_UINT32, BASE_DEC, NULL, 0x0,
        "Version of <please tell Wireshark developers what this type is>", HFILL }},

    { &hf_mscldap_netlogon_lm_token,
      { "LM Token", "mscldap.netlogon.lm_token",
        FT_UINT16, BASE_HEX, NULL, 0x0,
        "LM Token", HFILL }},

    { &hf_mscldap_netlogon_nt_token,
      { "NT Token", "mscldap.netlogon.nt_token",
        FT_UINT16, BASE_HEX, NULL, 0x0,
        "NT Token", HFILL }},

    { &hf_mscldap_netlogon_flags,
      { "Flags", "mscldap.netlogon.flags",
        FT_UINT32, BASE_HEX, NULL, 0x0,
        "Netlogon flags describing the DC properties", HFILL }},

    { &hf_mscldap_domain_guid,
      { "Domain GUID", "mscldap.domain.guid",
        FT_BYTES, BASE_HEX, NULL, 0x0,
        "Domain GUID", HFILL }},

    { &hf_mscldap_forest,
      { "Forest", "mscldap.forest",
        FT_STRING, BASE_NONE, NULL, 0x0,
        "Forest", HFILL }},

    { &hf_mscldap_domain,
      { "Domain", "mscldap.domain",
        FT_STRING, BASE_NONE, NULL, 0x0,
        "Domainname", HFILL }},

    { &hf_mscldap_hostname,
      { "Hostname", "mscldap.hostname",
        FT_STRING, BASE_NONE, NULL, 0x0,
        "Hostname", HFILL }},

    { &hf_mscldap_nb_domain,
      { "NetBios Domain", "mscldap.nb_domain",
        FT_STRING, BASE_NONE, NULL, 0x0,
        "NetBios Domainname", HFILL }},

    { &hf_mscldap_nb_hostname,
      { "NetBios Hostname", "mscldap.nb_hostname",
        FT_STRING, BASE_NONE, NULL, 0x0,
        "NetBios Hostname", HFILL }},

    { &hf_mscldap_username,
      { "User", "mscldap.username",
        FT_STRING, BASE_NONE, NULL, 0x0,
        "User name", HFILL }},

    { &hf_mscldap_sitename,
      { "Site", "mscldap.sitename",
        FT_STRING, BASE_NONE, NULL, 0x0,
        "Site name", HFILL }},

    { &hf_mscldap_clientsitename,
      { "Client Site", "mscldap.clientsitename",
        FT_STRING, BASE_NONE, NULL, 0x0,
        "Client Site name", HFILL }},

    { &hf_ldap_sid,
      { "Sid", "ldap.sid",
        FT_STRING, BASE_NONE, NULL, 0x0,
        "Sid", HFILL }},

    { &hf_mscldap_netlogon_flags_pdc,
      { "PDC", "mscldap.netlogon.flags.pdc", FT_BOOLEAN, 32,
        TFS(&tfs_ads_pdc), 0x00000001, "Is this DC a PDC or not?", HFILL }},

    { &hf_mscldap_netlogon_flags_gc,
      { "GC", "mscldap.netlogon.flags.gc", FT_BOOLEAN, 32,
        TFS(&tfs_ads_gc), 0x00000004, "Does this dc service as a GLOBAL CATALOGUE?", HFILL }},

    { &hf_mscldap_netlogon_flags_ldap,
      { "LDAP", "mscldap.netlogon.flags.ldap", FT_BOOLEAN, 32,
        TFS(&tfs_ads_ldap), 0x00000008, "Does this DC act as an LDAP server?", HFILL }},

    { &hf_mscldap_netlogon_flags_ds,
      { "DS", "mscldap.netlogon.flags.ds", FT_BOOLEAN, 32,
        TFS(&tfs_ads_ds), 0x00000010, "Does this dc provide DS services?", HFILL }},

    { &hf_mscldap_netlogon_flags_kdc,
      { "KDC", "mscldap.netlogon.flags.kdc", FT_BOOLEAN, 32,
        TFS(&tfs_ads_kdc), 0x00000020, "Does this dc act as a KDC?", HFILL }},

    { &hf_mscldap_netlogon_flags_timeserv,
      { "Time Serv", "mscldap.netlogon.flags.timeserv", FT_BOOLEAN, 32,
        TFS(&tfs_ads_timeserv), 0x00000040, "Does this dc provide time services (ntp) ?", HFILL }},

    { &hf_mscldap_netlogon_flags_closest,
      { "Closest", "mscldap.netlogon.flags.closest", FT_BOOLEAN, 32,
        TFS(&tfs_ads_closest), 0x00000080, "Is this the closest dc? (is this used at all?)", HFILL }},

    { &hf_mscldap_netlogon_flags_writable,
      { "Writable", "mscldap.netlogon.flags.writable", FT_BOOLEAN, 32,
        TFS(&tfs_ads_writable), 0x00000100, "Is this dc writable? (i.e. can it update the AD?)", HFILL }},

    { &hf_mscldap_netlogon_flags_good_timeserv,
      { "Good Time Serv", "mscldap.netlogon.flags.good_timeserv", FT_BOOLEAN, 32,
        TFS(&tfs_ads_good_timeserv), 0x00000200, "Is this a Good Time Server? (i.e. does it have a hardware clock)", HFILL }},

    { &hf_mscldap_netlogon_flags_ndnc,
      { "NDNC", "mscldap.netlogon.flags.ndnc", FT_BOOLEAN, 32,
        TFS(&tfs_ads_ndnc), 0x00000400, "Is this an NDNC dc?", HFILL }},

    { &hf_ldap_guid,
      { "GUID", "ldap.guid", FT_GUID, BASE_NONE,
        NULL, 0, "GUID", HFILL }},

    { &hf_ldap_AccessMask_ADS_CREATE_CHILD, 
        { "Create Child", "ldap.AccessMask.ADS_CREATE_CHILD", FT_BOOLEAN, 32, TFS(&ldap_AccessMask_ADS_CREATE_CHILD_tfs), LDAP_ACCESSMASK_ADS_CREATE_CHILD, "", HFILL }},

    { &hf_ldap_AccessMask_ADS_DELETE_CHILD, 
        { "Delete Child", "ldap.AccessMask.ADS_DELETE_CHILD", FT_BOOLEAN, 32, TFS(&ldap_AccessMask_ADS_DELETE_CHILD_tfs), LDAP_ACCESSMASK_ADS_DELETE_CHILD, "", HFILL }},

    { &hf_ldap_AccessMask_ADS_LIST, 
        { "List", "ldap.AccessMask.ADS_LIST", FT_BOOLEAN, 32, TFS(&ldap_AccessMask_ADS_LIST_tfs), LDAP_ACCESSMASK_ADS_LIST, "", HFILL }},

    { &hf_ldap_AccessMask_ADS_SELF_WRITE, 
        { "Self Write", "ldap.AccessMask.ADS_SELF_WRITE", FT_BOOLEAN, 32, TFS(&ldap_AccessMask_ADS_SELF_WRITE_tfs), LDAP_ACCESSMASK_ADS_SELF_WRITE, "", HFILL }},

    { &hf_ldap_AccessMask_ADS_READ_PROP, 
        { "Read Prop", "ldap.AccessMask.ADS_READ_PROP", FT_BOOLEAN, 32, TFS(&ldap_AccessMask_ADS_READ_PROP_tfs), LDAP_ACCESSMASK_ADS_READ_PROP, "", HFILL }},

    { &hf_ldap_AccessMask_ADS_WRITE_PROP, 
        { "Write Prop", "ldap.AccessMask.ADS_WRITE_PROP", FT_BOOLEAN, 32, TFS(&ldap_AccessMask_ADS_WRITE_PROP_tfs), LDAP_ACCESSMASK_ADS_WRITE_PROP, "", HFILL }},

    { &hf_ldap_AccessMask_ADS_DELETE_TREE, 
        { "Delete Tree", "ldap.AccessMask.ADS_DELETE_TREE", FT_BOOLEAN, 32, TFS(&ldap_AccessMask_ADS_DELETE_TREE_tfs), LDAP_ACCESSMASK_ADS_DELETE_TREE, "", HFILL }},

    { &hf_ldap_AccessMask_ADS_LIST_OBJECT, 
        { "List Object", "ldap.AccessMask.ADS_LIST_OBJECT", FT_BOOLEAN, 32, TFS(&ldap_AccessMask_ADS_LIST_OBJECT_tfs), LDAP_ACCESSMASK_ADS_LIST_OBJECT, "", HFILL }},

    { &hf_ldap_AccessMask_ADS_CONTROL_ACCESS, 
        { "Control Access", "ldap.AccessMask.ADS_CONTROL_ACCESS", FT_BOOLEAN, 32, TFS(&ldap_AccessMask_ADS_CONTROL_ACCESS_tfs), LDAP_ACCESSMASK_ADS_CONTROL_ACCESS, "", HFILL }},

#include "packet-ldap-hfarr.c"
  };

  /* List of subtrees */
  static gint *ett[] = {
    &ett_ldap,
    &ett_ldap_payload,
    &ett_ldap_sasl_blob,
    &ett_ldap_msg,
    &ett_mscldap_netlogon_flags,

#include "packet-ldap-ettarr.c"
  };

    module_t *ldap_module;

  /* Register protocol */
  proto_ldap = proto_register_protocol(PNAME, PSNAME, PFNAME);
  /* Register fields and subtrees */
  proto_register_field_array(proto_ldap, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));


  register_dissector("ldap", dissect_ldap_tcp, proto_ldap);

  ldap_module = prefs_register_protocol(proto_ldap, NULL);
  prefs_register_bool_preference(ldap_module, "desegment_ldap_messages",
    "Reassemble LDAP messages spanning multiple TCP segments",
    "Whether the LDAP dissector should reassemble messages spanning multiple TCP segments."
    " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings, and disable \"Verify length\" in the BER protocol settings",
    &ldap_desegment);

  prefs_register_uint_preference(ldap_module, "tcp.port", "LDAP TCP Port",
                         "Set the port for LDAP operations",
                         10, &ldap_tcp_port);

  prefs_register_uint_preference(ldap_module, "max_pdu", "LDAP Maximum PDU Size",
                         "The maximum LDAP PDU size. PDUs larger than this will be considered invalid.",
                         10, &ldap_max_pdu_size);

  proto_cldap = proto_register_protocol(
        "Connectionless Lightweight Directory Access Protocol",
        "CLDAP", "cldap");

  register_init_routine(ldap_reinit);
  ldap_tap=register_tap("ldap");

  ldap_name_dissector_table = register_dissector_table("ldap.name", "LDAP Attribute Type Dissectors", FT_STRING, BASE_NONE);

}


/*--- proto_reg_handoff_ldap ---------------------------------------*/
void
proto_reg_handoff_ldap(void)
{
      dissector_handle_t ldap_handle, cldap_handle;
      ldap_handle = create_dissector_handle(dissect_ldap_tcp, proto_ldap);

      dissector_add("tcp.port", ldap_tcp_port, ldap_handle);
      dissector_add("tcp.port", TCP_PORT_GLOBALCAT_LDAP, ldap_handle);

      cldap_handle = create_dissector_handle(dissect_mscldap, proto_cldap);
      dissector_add("udp.port", UDP_PORT_CLDAP, cldap_handle);

      gssapi_handle = find_dissector("gssapi");
      gssapi_wrap_handle = find_dissector("gssapi_verf");

      ntlmssp_handle = find_dissector("ntlmssp");

/*  http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dsml/dsml/ldap_controls_and_session_support.asp */
      add_oid_str_name("1.2.840.113556.1.4.319","LDAP_PAGED_RESULT_OID_STRING");
      add_oid_str_name("1.2.840.113556.1.4.417","LDAP_SERVER_SHOW_DELETED_OID");
      add_oid_str_name("1.2.840.113556.1.4.473","LDAP_SERVER_SORT_OID");
      add_oid_str_name("1.2.840.113556.1.4.474","LDAP_CONTROL_SORT_RESP_OID");
      add_oid_str_name("1.2.840.113556.1.4.521","LDAP_SERVER_CROSSDOM_MOVE_TARGET_OID");
      add_oid_str_name("1.2.840.113556.1.4.528","LDAP_SERVER_NOTIFICATION_OID");
      add_oid_str_name("1.2.840.113556.1.4.529","LDAP_SERVER_EXTENDED_DN_OID");
      add_oid_str_name("1.2.840.113556.1.4.619","LDAP_SERVER_LAZY_COMMIT_OID");
      add_oid_str_name("1.2.840.113556.1.4.800","LDAP_CAP_ACTIVE_DIRECTORY_OID");
      add_oid_str_name("1.2.840.113556.1.4.801","LDAP_SERVER_SD_FLAGS_OID");
      add_oid_str_name("1.2.840.113556.1.4.804","LDAP_OID_COMPARATOR_OR");
      add_oid_str_name("1.2.840.113556.1.4.805","LDAP_SERVER_TREE_DELETE_OID");
      add_oid_str_name("1.2.840.113556.1.4.841","LDAP_SERVER_DIRSYNC_OID");
      add_oid_str_name("1.2.840.113556.1.4.970 ","None");
      add_oid_str_name("1.2.840.113556.1.4.1338","LDAP_SERVER_VERIFY_NAME_OID");
      add_oid_str_name("1.2.840.113556.1.4.1339","LDAP_SERVER_DOMAIN_SCOPE_OID");
      add_oid_str_name("1.2.840.113556.1.4.1340","LDAP_SERVER_SEARCH_OPTIONS_OID");
      add_oid_str_name("1.2.840.113556.1.4.1413","LDAP_SERVER_PERMISSIVE_MODIFY_OID");
      add_oid_str_name("1.2.840.113556.1.4.1504","LDAP_SERVER_ASQ_OID");
      add_oid_str_name("1.2.840.113556.1.4.1670","LDAP_CAP_ACTIVE_DIRECTORY_V51_OID");
      add_oid_str_name("1.2.840.113556.1.4.1781","LDAP_SERVER_FAST_BIND_OID");
      add_oid_str_name("1.2.840.113556.1.4.1791","LDAP_CAP_ACTIVE_DIRECTORY_LDAP_INTEG_OID");
      add_oid_str_name("1.2.840.113556.1.4.1851","LDAP_CAP_ACTIVE_DIRECTORY_ADAM_OID");
      add_oid_str_name("1.3.6.1.4.1.1466.101.119.1","None");
      add_oid_str_name("1.3.6.1.4.1.1466.20037","LDAP_START_TLS_OID");
      add_oid_str_name("2.16.840.1.113730.3.4.9","LDAP_CONTROL_VLVREQUEST VLV");
      add_oid_str_name("2.16.840.1.113730.3.4.10","LDAP_CONTROL_VLVRESPONSE VLV");

      register_ldap_name_dissector("netlogon", dissect_NetLogon_PDU, proto_cldap);
      register_ldap_name_dissector("objectGUID", dissect_ldap_guid, proto_ldap);
      register_ldap_name_dissector("supportedControl", dissect_ldap_oid, proto_ldap);
      register_ldap_name_dissector("supportedCapabilities", dissect_ldap_oid, proto_ldap);
      register_ldap_name_dissector("objectSid", dissect_ldap_sid, proto_ldap);
      register_ldap_name_dissector("nTSecurityDescriptor", dissect_ldap_nt_sec_desc, proto_ldap);
}



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