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wireshark/asn1/ldap/packet-ldap-template.c

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/* packet-ldap.c
* Routines for ldap packet dissection
*
* See RFC 1777 (LDAP v2), RFC 2251 (LDAP v3), and RFC 2222 (SASL).
*
* $Id$
*
* 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 asn2eth compiler
* Anders Broman <anders.broman@ericsson.com>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <string.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 "packet-frame.h"
#include "packet-ldap.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_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;
#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 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;
/* 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;
gboolean first_time;
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;
}
/* 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){
if(lcrp->is_request){
proto_tree_add_uint(tree, hf_ldap_response_in, tvb, 0, 0, lcrp->rep_frame);
} else {
nstime_t ns;
proto_tree_add_uint(tree, hf_ldap_response_to, tvb, 0, 0, lcrp->req_frame);
nstime_delta(&ns, &pinfo->fd->abs_ts, &lcrp->req_time);
proto_tree_add_time(tree, hf_ldap_time, tvb, 0, 0, &ns);
}
}
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;
gboolean first_time = TRUE;
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;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
/*
* This will throw an exception if we don't have any data left.
* That's what we want. (See "tcp_dissect_pdus()", which is
* similar)
*/
length_remaining = tvb_ensure_length_remaining(tvb, offset);
if (rest_is_pad && length_remaining < 6) return;
/*
* The frame begins
* with a "Sequence Of" header.
* Can we do reassembly?
*/
if (ldap_desegment && pinfo->can_desegment) {
/*
* Yes - is the "Sequence Of" header split across segment
* boundaries? We require at least 6 bytes for the header
* which allows for a 4 byte length (ASN.1 BER).
*/
if (length_remaining < 6) {
/* stop if the caller says that we are given all data and the rest is padding
* this is for the SASL GSSAPI case when the data is only signed and not sealed
*/
pinfo->desegment_offset = offset;
pinfo->desegment_len = 6 - length_remaining;
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;
}
/*
* Is the message split across segment boundaries?
*/
if (length_remaining < msg_len) {
/* provide a hint to TCP where the next PDU starts */
pinfo->want_pdu_tracking=2;
pinfo->bytes_until_next_pdu= msg_len - length_remaining;
/*
* Can we do reassembly?
*/
if (ldap_desegment && pinfo->can_desegment) {
/*
* Yes. Tell the TCP dissector where the data for this message
* starts in the data it handed us, and how many more bytes
* we need, and return.
*/
pinfo->desegment_offset = offset;
pinfo->desegment_len = msg_len - length_remaining;
return;
}
}
/*
* 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.
*/
/*dissect_ldap_message(msg_tvb, 0, pinfo, msg_tree, msg_item, first_time, ldap_info, is_mscldap);*/
ldap_info->first_time= first_time;
ldap_info->is_mscldap = is_mscldap;
pinfo->private_data = ldap_info;
dissect_LDAPMessage_PDU(msg_tvb, pinfo, tree);
offset += msg_len;
first_time = FALSE;
}
}
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;
/*
* 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 */
}
}
while (tvb_reported_length_remaining(tvb, offset) > 0) {
/*
* This will throw an exception if we don't have any data left.
* That's what we want. (See "tcp_dissect_pdus()", which is
* similar, but doesn't have to deal with the SASL issues.
* XXX - can we make "tcp_dissect_pdus()" provide enough information
* to the "get_pdu_len" routine so that we could have one dealing
* with the SASL issues, have that routine deal with SASL and
* ASN.1, and just use "tcp_dissect_pdus()"?)
*/
length_remaining = tvb_ensure_length_remaining(tvb, offset);
/*
* Try to find out if we have a plain LDAP buffer
* with a "Sequence Of" header or a SASL buffer with
* Can we do reassembly?
*/
if (ldap_desegment && pinfo->can_desegment) {
/*
* Yes - is the "Sequence Of" header split across segment
* boundaries? We require at least 6 bytes for the header
* which allows for a 4 byte length (ASN.1 BER).
* For the SASL case we need at least 4 bytes, so this is
* no problem here because we check for 6 bytes ans sasl buffers
* with less than 2 bytes should not exist...
*/
if (length_remaining < 6) {
pinfo->desegment_offset = offset;
pinfo->desegment_len = 6 - length_remaining;
return;
}
}
/* 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, 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;
}
/*
* Is the buffer split across segment boundaries?
*/
if (length_remaining < sasl_msg_len) {
/* provide a hint to TCP where the next PDU starts */
pinfo->want_pdu_tracking = 2;
pinfo->bytes_until_next_pdu= sasl_msg_len - length_remaining;
/*
* Can we do reassembly?
*/
if (ldap_desegment && pinfo->can_desegment) {
/*
* Yes. Tell the TCP dissector where the data for this message
* starts in the data it handed us, and how many more bytes we
* need, and return.
*/
pinfo->desegment_offset = offset;
pinfo->desegment_len = sasl_msg_len - length_remaining;
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);
/* dissect_ldap_payload() has it's own loop so go out here */
break;
}
}
}
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];
/*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 void
dissect_ldap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
dissect_ldap_pdu(tvb, pinfo, tree, FALSE);
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 ethereal developers what this type is>", HFILL }},
{ &hf_mscldap_netlogon_version,
{ "Version", "mscldap.netlogon.version",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Version of <please tell ethereal 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_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 }},
#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, 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);
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, 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");
/* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dsml/dsml/ldap_controls_and_session_support.asp */
register_ber_oid_name("1.2.840.113556.1.4.319","LDAP_PAGED_RESULT_OID_STRING");
register_ber_oid_name("1.2.840.113556.1.4.417","LDAP_SERVER_SHOW_DELETED_OID");
register_ber_oid_name("1.2.840.113556.1.4.473","LDAP_SERVER_SORT_OID");
register_ber_oid_name("1.2.840.113556.1.4.521","LDAP_SERVER_CROSSDOM_MOVE_TARGET_OID");
register_ber_oid_name("1.2.840.113556.1.4.528","LDAP_SERVER_NOTIFICATION_OID");
register_ber_oid_name("1.2.840.113556.1.4.529","LDAP_SERVER_EXTENDED_DN_OID");
register_ber_oid_name("1.2.840.113556.1.4.619","LDAP_SERVER_LAZY_COMMIT_OID");
register_ber_oid_name("1.2.840.113556.1.4.801","LDAP_SERVER_SD_FLAGS_OID");
register_ber_oid_name("1.2.840.113556.1.4.805","LDAP_SERVER_TREE_DELETE_OID");
register_ber_oid_name("1.2.840.113556.1.4.841","LDAP_SERVER_DIRSYNC_OID");
register_ber_oid_name("1.2.840.113556.1.4.970 ","None");
register_ber_oid_name("1.2.840.113556.1.4.1338","LDAP_SERVER_VERIFY_NAME_OID");
register_ber_oid_name("1.2.840.113556.1.4.1339","LDAP_SERVER_DOMAIN_SCOPE_OID");
register_ber_oid_name("1.2.840.113556.1.4.1340","LDAP_SERVER_SEARCH_OPTIONS_OID");
register_ber_oid_name("1.2.840.113556.1.4.1413","LDAP_SERVER_PERMISSIVE_MODIFY_OID");
register_ber_oid_name("1.2.840.113556.1.4.1504","LDAP_SERVER_ASQ_OID");
register_ber_oid_name("1.2.840.113556.1.4.1781","LDAP_SERVER_FAST_BIND_OID");
register_ber_oid_name("1.3.6.1.4.1.1466.101.119.1","None");
register_ber_oid_name("1.3.6.1.4.1.1466.20037","LDAP_START_TLS_OID");
register_ber_oid_name("2.16.840.1.113730.3.4.9","LDAP_CONTROL_VLVREQUEST VLV");
register_ldap_name_dissector("netlogon", dissect_NetLogon_PDU, proto_cldap);
}
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