forked from osmocom/wireshark
458 lines
9.7 KiB
C
458 lines
9.7 KiB
C
/* packet-smb-sidsnooping.c
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* Routines for snooping SID to name mappings
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* Copyright 2003, Ronnie Sahlberg
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*
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* $Id: packet-smb-sidsnooping.c,v 1.13 2004/06/04 00:15:55 tpot Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include "epan/packet_info.h"
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#include "epan/epan_dissect.h"
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#include "epan/proto.h"
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#include "tap.h"
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#include "packet-dcerpc.h"
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#include "packet-dcerpc-nt.h"
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#include "register.h"
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#include "smb.h"
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#include "packet-smb-sidsnooping.h"
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static int hf_lsa = -1;
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static int hf_lsa_info_level = -1;
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static int hf_lsa_opnum = -1;
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static int hf_lsa_domain = -1;
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static int hf_nt_domain_sid = -1;
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static int hf_samr_hnd = -1;
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static int hf_samr_rid = -1;
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static int hf_samr_acct_name = -1;
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static int hf_samr_level = -1;
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GHashTable *sid_name_table = NULL;
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static GMemChunk *sid_name_chunk = NULL;
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static int sid_name_init_count = 200;
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static GMemChunk *ctx_handle_chunk = NULL;
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static int ctx_handle_init_count = 200;
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static GHashTable *ctx_handle_table = NULL;
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static void *lsa_policy_information_flag = NULL;
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static void *samr_query_dispinfo_flag = NULL;
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char *
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find_sid_name(char *sid)
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{
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sid_name *sn;
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sid_name old_sn;
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old_sn.sid=sid;
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sn=g_hash_table_lookup(sid_name_table, &old_sn);
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if(!sn){
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return NULL;
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}
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return sn->name;
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}
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static void
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add_sid_name_mapping(char *sid, char *name)
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{
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sid_name *sn;
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sid_name old_sn;
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old_sn.sid=sid;
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sn=g_hash_table_lookup(sid_name_table, &old_sn);
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if(sn){
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return;
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}
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sn=g_mem_chunk_alloc(sid_name_chunk);
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sn->sid=g_strdup(sid);
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sn->name=g_strdup(name);
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g_hash_table_insert(sid_name_table, sn, sn);
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}
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/*
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* QueryDispInfo :
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* level 1 : user displayinfo 1
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*/
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static int
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samr_query_dispinfo(void *dummy _U_, packet_info *pinfo, epan_dissect_t *edt, void *pri)
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{
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dcerpc_info *ri=pri;
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void *old_ctx=NULL;
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char *pol_name;
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char *sid;
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int sid_len;
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int num_rids;
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int num_names;
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GPtrArray *gp;
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GPtrArray *gp_rids;
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GPtrArray *gp_names;
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field_info *fi;
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field_info *fi_rid;
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field_info *fi_name;
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char sid_name[256];
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int info_level;
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gp=proto_get_finfo_ptr_array(edt->tree, hf_samr_level);
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if(!gp || gp->len!=1){
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return 0;
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}
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fi=gp->pdata[0];
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info_level=fi->value.value.integer;
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if(info_level!=1){
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return 0;
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}
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if(!ri){
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return 0;
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}
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if(!ri->call_data){
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return 0;
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}
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if(ri->ptype == PDU_REQ){
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gp=proto_get_finfo_ptr_array(edt->tree, hf_samr_hnd);
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if(!gp || gp->len!=1){
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return 0;
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}
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fi=gp->pdata[0];
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old_ctx=g_hash_table_lookup(ctx_handle_table, (gpointer)pinfo->fd->num);
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if(old_ctx){
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g_hash_table_remove(ctx_handle_table, (gpointer)pinfo->fd->num);
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}
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if(!old_ctx){
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old_ctx=g_mem_chunk_alloc(ctx_handle_chunk);
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memcpy(old_ctx, fi->value.value.bytes->data, 20);
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}
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g_hash_table_insert(ctx_handle_table, (gpointer)pinfo->fd->num, old_ctx);
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return 0;
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}
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if(!ri->call_data->req_frame){
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return 0;
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}
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old_ctx=g_hash_table_lookup(ctx_handle_table, (gpointer)ri->call_data->req_frame);
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if(!old_ctx){
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return 0;
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}
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if (!dcerpc_smb_fetch_pol(old_ctx, &pol_name, NULL, NULL, ri->call_data->req_frame)) {
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return 0;
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}
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if (!pol_name)
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return 0;
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sid=strstr(pol_name,"S-1-5");
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if(!sid){
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return 0;
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}
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for(sid_len=4;1;sid_len++){
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if((sid[sid_len]>='0') && (sid[sid_len]<='9')){
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continue;
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}
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if(sid[sid_len]=='-'){
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continue;
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}
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break;
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}
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gp_rids=proto_get_finfo_ptr_array(edt->tree, hf_samr_rid);
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if(!gp_rids || gp_rids->len<1){
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return 0;
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}
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num_rids=gp_rids->len;
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gp_names=proto_get_finfo_ptr_array(edt->tree, hf_samr_acct_name);
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if(!gp_names || gp_names->len<1){
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return 0;
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}
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num_names=gp_names->len;
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if(num_rids>num_names){
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num_rids=num_names;
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}
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for(;num_rids;num_rids--){
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int len=sid_len;
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fi_rid=gp_rids->pdata[num_rids-1];
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fi_name=gp_names->pdata[num_rids-1];
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strncpy(sid_name, sid, len);
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sid_name[len++]='-';
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len+=sprintf(sid_name+len,"%d",fi_rid->value.value.integer);
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sid_name[len]=0;
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add_sid_name_mapping(sid_name, fi_name->value.value.string);
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}
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return 1;
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}
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/*
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* PolicyInformation :
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* level 3 : PRIMARY_DOMAIN_INFO lsa.domain_sid -> lsa.domain
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* level 5 : ACCOUNT_DOMAIN_INFO lsa.domain_sid -> lsa.domain
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* level 12 : DNS_DOMAIN_INFO lsa.domain_sid -> lsa.domain
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*/
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static int
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lsa_policy_information(void *dummy _U_, packet_info *pinfo _U_, epan_dissect_t *edt, void *pri _U_)
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{
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GPtrArray *gp;
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field_info *fi;
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char *domain;
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char *sid;
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int info_level;
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gp=proto_get_finfo_ptr_array(edt->tree, hf_lsa_info_level);
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if(!gp || gp->len!=1){
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return 0;
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}
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fi=gp->pdata[0];
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info_level=fi->value.value.integer;
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switch(info_level){
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case 3:
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case 5:
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case 12:
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gp=proto_get_finfo_ptr_array(edt->tree, hf_lsa_domain);
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if(!gp || gp->len!=1){
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return 0;
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}
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fi=gp->pdata[0];
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domain=fi->value.value.string;
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gp=proto_get_finfo_ptr_array(edt->tree, hf_nt_domain_sid);
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if(!gp || gp->len!=1){
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return 0;
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}
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fi=gp->pdata[0];
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sid=fi->value.value.string;
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add_sid_name_mapping(sid, domain);
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break;
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}
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return 0;
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}
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static gboolean
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free_all_sid_names(gpointer key_arg, gpointer value _U_, gpointer user_data _U_)
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{
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sid_name *sn = (sid_name *)key_arg;
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if(sn->sid){
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g_free((gpointer)sn->sid);
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sn->sid=NULL;
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}
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if(sn->name){
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g_free((gpointer)sn->name);
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sn->name=NULL;
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}
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return TRUE;
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}
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static gint
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sid_name_equal(gconstpointer k1, gconstpointer k2)
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{
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const sid_name *sn1 = (const sid_name *)k1;
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const sid_name *sn2 = (const sid_name *)k2;
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return !strcmp(sn1->sid, sn2->sid);
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}
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static guint
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sid_name_hash(gconstpointer k)
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{
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const sid_name *sn = (const sid_name *)k;
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int i, sum;
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for(sum=0,i=strlen(sn->sid)-1;i>=0;i--){
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sum+=sn->sid[i];
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}
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return sum;
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}
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static gboolean
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free_all_ctx_handle(gpointer key_arg _U_, gpointer value _U_, gpointer user_data _U_)
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{
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return TRUE;
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}
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static gint
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ctx_handle_equal(gconstpointer k1, gconstpointer k2)
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{
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int sn1 = (int)k1;
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int sn2 = (int)k2;
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return sn1==sn2;
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}
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static guint
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ctx_handle_hash(gconstpointer k)
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{
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int sn = (int)k;
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return sn;
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}
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static void
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sid_snooping_init(void)
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{
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header_field_info *hfi;
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GString *error_string;
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if(lsa_policy_information_flag){
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remove_tap_listener(lsa_policy_information_flag);
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lsa_policy_information_flag=NULL;
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}
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if(samr_query_dispinfo_flag){
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remove_tap_listener(samr_query_dispinfo_flag);
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samr_query_dispinfo_flag=NULL;
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}
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if(sid_name_table){
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g_hash_table_foreach_remove(sid_name_table, free_all_sid_names, NULL);
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sid_name_table=NULL;
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}
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if(sid_name_chunk){
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g_mem_chunk_destroy(sid_name_chunk);
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sid_name_chunk=NULL;
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}
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if(ctx_handle_table){
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g_hash_table_foreach_remove(ctx_handle_table, free_all_ctx_handle, NULL);
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ctx_handle_table=NULL;
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}
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if(ctx_handle_chunk){
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g_mem_chunk_destroy(ctx_handle_chunk);
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ctx_handle_chunk=NULL;
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}
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if(!sid_name_snooping){
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return;
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}
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sid_name_table=g_hash_table_new(sid_name_hash, sid_name_equal);
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sid_name_chunk = g_mem_chunk_new("sid_name_chunk",
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sizeof(sid_name),
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sid_name_init_count * sizeof(sid_name),
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G_ALLOC_ONLY);
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ctx_handle_table=g_hash_table_new(ctx_handle_hash, ctx_handle_equal);
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ctx_handle_chunk = g_mem_chunk_new("ctx_handle_chunk",
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20, /* our dcerpc context handles are 20 bytes */
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ctx_handle_init_count * 20,
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G_ALLOC_ONLY);
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hf_lsa=proto_get_id_by_filter_name("lsa");
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hfi=proto_registrar_get_byname("lsa.opnum");
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if(hfi){
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hf_lsa_opnum=hfi->id;
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}
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hfi=proto_registrar_get_byname("nt.domain_sid");
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if(hfi){
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hf_nt_domain_sid=hfi->id;
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}
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hfi=proto_registrar_get_byname("lsa.domain");
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if(hfi){
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hf_lsa_domain=hfi->id;
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}
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hfi=proto_registrar_get_byname("lsa.info.level");
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if(hfi){
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hf_lsa_info_level=hfi->id;
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}
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hfi=proto_registrar_get_byname("samr.hnd");
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if(hfi){
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hf_samr_hnd=hfi->id;
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}
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hfi=proto_registrar_get_byname("samr.rid");
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if(hfi){
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hf_samr_rid=hfi->id;
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}
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hfi=proto_registrar_get_byname("samr.acct_name");
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if(hfi){
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hf_samr_acct_name=hfi->id;
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}
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hfi=proto_registrar_get_byname("samr.level");
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if(hfi){
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hf_samr_level=hfi->id;
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}
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error_string=register_tap_listener("dcerpc", lsa_policy_information, "lsa.policy_information and ( lsa.info.level or lsa.domain or nt.domain_sid )", NULL, lsa_policy_information, NULL);
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if(error_string){
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/* error, we failed to attach to the tap. clean up */
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fprintf(stderr, "tethereal: Couldn't register proto_reg_handoff_smb_sidsnooping()/lsa_policy_information tap: %s\n",
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error_string->str);
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g_string_free(error_string, TRUE);
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exit(1);
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}
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lsa_policy_information_flag=lsa_policy_information;
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error_string=register_tap_listener("dcerpc", samr_query_dispinfo, "samr and samr.opnum==40 and ( samr.hnd or samr.rid or samr.acct_name or samr.level )", NULL, samr_query_dispinfo, NULL);
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if(error_string){
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/* error, we failed to attach to the tap. clean up */
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fprintf(stderr, "tethereal: Couldn't register proto_reg_handoff_smb_sidsnooping()/samr_query_dispinfo tap: %s\n",
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error_string->str);
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g_string_free(error_string, TRUE);
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exit(1);
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}
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samr_query_dispinfo_flag=samr_query_dispinfo;
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}
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void
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proto_register_smb_sidsnooping(void)
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{
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register_init_routine(sid_snooping_init);
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}
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void
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proto_reg_handoff_smb_sidsnooping(void)
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{
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}
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