![Ronnie Sahlberg](/assets/img/avatar_default.png)
this will allow reassembly of gssapi blobs that span multiple smb/sessionsetup command pdus svn path=/trunk/; revision=19119
632 lines
18 KiB
C
632 lines
18 KiB
C
/* packet-gssapi.c
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* Dissector for GSS-API tokens as described in rfc2078, section 3.1
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* Copyright 2002, Tim Potter <tpot@samba.org>
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* Copyright 2002, Richard Sharpe <rsharpe@samba.org> Added a few
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* bits and pieces ...
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/dissectors/packet-dcerpc.h>
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#include <epan/dissectors/packet-gssapi.h>
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#include <epan/dissectors/packet-frame.h>
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#include "epan/conversation.h"
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#include "epan/emem.h"
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#include "epan/prefs.h"
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#include "epan/reassemble.h"
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#include "packet-ber.h"
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#include "to_str.h"
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static int proto_gssapi = -1;
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static int hf_gssapi_oid = -1;
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static int hf_gssapi_segments = -1;
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static int hf_gssapi_segment = -1;
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static int hf_gssapi_segment_overlap = -1;
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static int hf_gssapi_segment_overlap_conflict = -1;
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static int hf_gssapi_segment_multiple_tails = -1;
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static int hf_gssapi_segment_too_long_fragment = -1;
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static int hf_gssapi_segment_error = -1;
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static int hf_gssapi_reassembled_in = -1;
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static gint ett_gssapi = -1;
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static gint ett_gssapi_segment = -1;
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static gint ett_gssapi_segments = -1;
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static gboolean gssapi_reassembly = TRUE;
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typedef struct _gssapi_conv_info_t {
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gssapi_oid_value *oid;
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emem_tree_t *frags;
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gboolean do_reassembly; /* this field is used on first sequential scan of packets to help indicate when the next blob is a fragment continuing a previous one */
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int first_frame;
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int frag_offset;
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} gssapi_conv_info_t;
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typedef struct _gssapi_frag_info_t {
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guint32 first_frame;
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guint32 reassembled_in;
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} gssapi_frag_info_t;
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static const fragment_items gssapi_frag_items = {
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&ett_gssapi_segment,
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&ett_gssapi_segments,
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&hf_gssapi_segments,
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&hf_gssapi_segment,
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&hf_gssapi_segment_overlap,
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&hf_gssapi_segment_overlap_conflict,
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&hf_gssapi_segment_multiple_tails,
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&hf_gssapi_segment_too_long_fragment,
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&hf_gssapi_segment_error,
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NULL,
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"fragments"
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};
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static GHashTable *gssapi_fragment_table = NULL;
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static void
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gssapi_reassembly_init(void)
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{
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fragment_table_init(&gssapi_fragment_table);
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}
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/*
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* Subdissectors
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*/
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static dissector_handle_t ntlmssp_handle = NULL;
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static GHashTable *gssapi_oids;
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static gint gssapi_oid_equal(gconstpointer k1, gconstpointer k2)
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{
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const char *key1 = (const char *)k1;
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const char *key2 = (const char *)k2;
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return strcmp(key1, key2) == 0;
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}
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static guint
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gssapi_oid_hash(gconstpointer k)
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{
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const char *key = (const char *)k;
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guint hash = 0, i;
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for (i = 0; i < strlen(key); i++)
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hash += key[i];
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return hash;
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}
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void
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gssapi_init_oid(const char *oid, int proto, int ett, dissector_handle_t handle,
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dissector_handle_t wrap_handle, const gchar *comment)
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{
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char *key = g_strdup(oid);
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gssapi_oid_value *value = g_malloc(sizeof(*value));
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value->proto = find_protocol_by_id(proto);
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value->ett = ett;
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value->handle = handle;
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value->wrap_handle = wrap_handle;
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value->comment = comment;
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g_hash_table_insert(gssapi_oids, key, value);
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register_ber_oid_dissector_handle(key, handle, proto, comment);
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}
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/*
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* This takes an OID in text string form as
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* an argument.
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*/
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gssapi_oid_value *
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gssapi_lookup_oid_str(const char *oid_key)
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{
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gssapi_oid_value *value;
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if(!oid_key){
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return NULL;
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}
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value = g_hash_table_lookup(gssapi_oids, oid_key);
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return value;
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}
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static int
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dissect_gssapi_work(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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gboolean is_verifier)
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{
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proto_item *item;
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proto_tree *subtree;
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int return_offset = 0;
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gssapi_conv_info_t *gss_info;
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gssapi_oid_value *oidvalue;
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dissector_handle_t handle;
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conversation_t *conversation;
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tvbuff_t *oid_tvb;
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int len, offset, start_offset, oid_start_offset;
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gint8 class;
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gboolean pc, ind_field;
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gint32 tag;
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guint32 len1;
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const char *oid;
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fragment_data *fd_head=NULL;
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gssapi_frag_info_t *fi;
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tvbuff_t *gss_tvb=NULL;
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start_offset=0;
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offset=0;
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/*
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* We don't know whether the data is encrypted, so say it's
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* not, for now. The subdissector must set gssapi_data_encrypted
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* if it is.
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*/
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pinfo->gssapi_data_encrypted = FALSE;
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/*
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* We need a conversation for later
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*/
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conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
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pinfo->ptype, pinfo->srcport,
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pinfo->destport, 0);
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if(!conversation){
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conversation = conversation_new(pinfo->fd->num, &pinfo->src,
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&pinfo->dst,
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pinfo->ptype,
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pinfo->srcport,
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pinfo->destport, 0);
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}
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gss_info = conversation_get_proto_data(conversation, proto_gssapi);
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if (!gss_info) {
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gss_info = se_alloc(sizeof(gssapi_conv_info_t));
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gss_info->oid=NULL;
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gss_info->do_reassembly=FALSE;
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gss_info->frags=se_tree_create_non_persistent(EMEM_TREE_TYPE_RED_BLACK, "gssapi_frags");
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conversation_add_proto_data(conversation, proto_gssapi, gss_info);
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}
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item = proto_tree_add_item(
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tree, proto_gssapi, tvb, offset, -1, FALSE);
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subtree = proto_item_add_subtree(item, ett_gssapi);
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/*
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* Catch the ReportedBoundsError exception; the stuff we've been
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* handed doesn't necessarily run to the end of the packet, it's
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* an item inside a packet, so if it happens to be malformed (or
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* we, or a dissector we call, has a bug), so that an exception
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* is thrown, we want to report the error, but return and let
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* our caller dissect the rest of the packet.
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*
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* If it gets a BoundsError, we can stop, as there's nothing more
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* in the packet after our blob to see, so we just re-throw the
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* exception.
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*/
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TRY {
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gss_tvb=tvb;
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/* First of all, if its the first time we see this packet
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* then check whether we are in the middle of reassembly or not
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*/
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if( (!pinfo->fd->flags.visited)
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&& (gss_info->do_reassembly)
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&& (gssapi_reassembly) ){
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fi=se_tree_lookup32(gss_info->frags, gss_info->first_frame);
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if(!fi){
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goto done;
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}
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se_tree_insert32(gss_info->frags, pinfo->fd->num, fi);
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fd_head=fragment_add(tvb, 0, pinfo, fi->first_frame,
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gssapi_fragment_table, gss_info->frag_offset,
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tvb_length(tvb), TRUE);
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gss_info->frag_offset+=tvb_length(tvb);
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/* we need more fragments */
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if(!fd_head){
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goto done;
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}
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/* this blob is now fully reassembled */
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gss_info->do_reassembly=FALSE;
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fi->reassembled_in=pinfo->fd->num;
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gss_tvb=tvb_new_real_data(fd_head->data, fd_head->datalen, fd_head->datalen);
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tvb_set_child_real_data_tvbuff(tvb, gss_tvb);
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add_new_data_source(pinfo, gss_tvb, "Reassembled GSSAPI");
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}
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/* We have seen this packet before.
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* Is this blob part of reassembly or a normal blob ?
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*/
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if( (pinfo->fd->flags.visited)
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&& (gssapi_reassembly) ){
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fi=se_tree_lookup32(gss_info->frags, pinfo->fd->num);
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if(fi){
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fd_head=fragment_get(pinfo, fi->first_frame, gssapi_fragment_table);
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if(fd_head && (fd_head->flags&FD_DEFRAGMENTED)){
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if(pinfo->fd->num==fi->reassembled_in){
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proto_item *frag_tree_item;
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gss_tvb=tvb_new_real_data(fd_head->data, fd_head->datalen, fd_head->datalen);
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tvb_set_child_real_data_tvbuff(tvb, gss_tvb);
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add_new_data_source(pinfo, gss_tvb, "Reassembled GSSAPI");
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show_fragment_tree(fd_head, &gssapi_frag_items, tree, pinfo, tvb, &frag_tree_item);
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} else {
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proto_item *it;
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it=proto_tree_add_uint(tree, hf_gssapi_reassembled_in, tvb, 0, 0, fi->reassembled_in);
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PROTO_ITEM_SET_GENERATED(it);
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goto done;
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}
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}
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}
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}
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/* Read header */
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offset = get_ber_identifier(gss_tvb, offset, &class, &pc, &tag);
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offset = get_ber_length(tree, gss_tvb, offset, &len1, &ind_field);
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if (!(class == BER_CLASS_APP && pc && tag == 0)) {
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/*
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* If we do not recognise an Application class,
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* then we are probably dealing with an inner context
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* token or a wrap token, and we should retrieve the
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* gssapi_oid_value pointer from the per-frame data or,
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* if there is no per-frame data (as would be the case
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* the first time we dissect this frame), from the
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* conversation that exists or that we created from
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* pinfo (and then make it per-frame data).
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* We need to make it per-frame data as there can be
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* more than one GSS-API negotiation in a conversation.
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*
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* Note! We "cheat". Since we only need the pointer,
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* we store that as the data. (That's not really
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* "cheating" - the per-frame data and per-conversation
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* data code doesn't care what you supply as a data
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* pointer; it just treats it as an opaque pointer, it
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* doesn't dereference it or free what it points to.)
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*/
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oidvalue = p_get_proto_data(pinfo->fd, proto_gssapi);
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if (!oidvalue && !pinfo->fd->flags.visited)
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{
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/* No handle attached to this frame, but it's the first */
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/* pass, so it'd be attached to the conversation. */
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oidvalue = gss_info->oid;
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if (gss_info->oid)
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p_add_proto_data(pinfo->fd, proto_gssapi, gss_info->oid);
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}
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if (!oidvalue)
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{
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/* It could be NTLMSSP, with no OID. This can happen
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for anything that microsoft calls 'Negotiate' or GSS-SPNEGO */
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if (tvb_strneql(gss_tvb, start_offset, "NTLMSSP", 7) == 0) {
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call_dissector(ntlmssp_handle, tvb_new_subset(gss_tvb, start_offset, -1, -1), pinfo, subtree);
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} else {
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proto_tree_add_text(subtree, gss_tvb, start_offset, 0,
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"Unknown header (class=%d, pc=%d, tag=%d)",
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class, pc, tag);
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}
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return_offset = tvb_length(gss_tvb);
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goto done;
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} else {
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tvbuff_t *oid_tvb;
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oid_tvb = tvb_new_subset(gss_tvb, start_offset, -1, -1);
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if (is_verifier)
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handle = oidvalue->wrap_handle;
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else
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handle = oidvalue->handle;
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len = call_dissector(handle, oid_tvb, pinfo, subtree);
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if (len == 0)
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return_offset = tvb_length(gss_tvb);
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else
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return_offset = start_offset + len;
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goto done; /* We are finished here */
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}
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}
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/* Read oid */
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oid_start_offset=offset;
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offset=dissect_ber_object_identifier_str(FALSE, pinfo, subtree, gss_tvb, offset, hf_gssapi_oid, &oid);
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oidvalue = gssapi_lookup_oid_str(oid);
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/* Check if we need reassembly of this blob.
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* Only try reassembly for OIDs we recognize
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* and when we have the entire tvb
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*
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* SMB will sometimes split one large GSSAPI blob
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* across multiple SMB/SessionSetup commands.
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* While we should look at the uid returned in the response
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* to the first SessionSetup and use that as a key
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* instead for simplicity we assume there will not be several
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* such authentication at once on a single tcp session
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*/
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if( (!pinfo->fd->flags.visited)
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&& (oidvalue)
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&& (tvb_length(gss_tvb)==tvb_reported_length(gss_tvb))
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&& (len1>(guint32)tvb_length_remaining(gss_tvb, oid_start_offset))
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&& (gssapi_reassembly) ){
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fi=se_alloc(sizeof(gssapi_frag_info_t));
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fi->first_frame=pinfo->fd->num;
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fi->reassembled_in=0;
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se_tree_insert32(gss_info->frags, pinfo->fd->num, fi);
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fragment_add(gss_tvb, 0, pinfo, pinfo->fd->num,
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gssapi_fragment_table, 0,
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tvb_length(gss_tvb), TRUE);
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fragment_set_tot_len(pinfo, pinfo->fd->num, gssapi_fragment_table, len1+oid_start_offset);
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gss_info->do_reassembly=TRUE;
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gss_info->first_frame=pinfo->fd->num;
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gss_info->frag_offset=tvb_length(gss_tvb);
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goto done;
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}
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/*
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* Hand off to subdissector.
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*/
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if ((oidvalue == NULL) ||
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!proto_is_protocol_enabled(oidvalue->proto)) {
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/* No dissector for this oid */
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proto_tree_add_text(subtree, gss_tvb, oid_start_offset, -1,
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"Token object");
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return_offset = tvb_length(gss_tvb);
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goto done;
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}
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/* Save a pointer to the data for the OID for the
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* GSSAPI protocol for this conversation.
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*/
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/*
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* Now add the proto data ...
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* but only if it is not already there.
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*/
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if(!gss_info->oid){
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gss_info->oid=oidvalue;
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}
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if (is_verifier) {
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handle = oidvalue->wrap_handle;
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if (handle != NULL) {
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oid_tvb = tvb_new_subset(gss_tvb, offset, -1, -1);
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len = call_dissector(handle, oid_tvb, pinfo,
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subtree);
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if (len == 0)
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return_offset = tvb_length(gss_tvb);
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else
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return_offset = offset + len;
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} else {
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proto_tree_add_text(subtree, gss_tvb, offset, -1,
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"Authentication verifier");
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return_offset = tvb_length(gss_tvb);
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}
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} else {
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handle = oidvalue->handle;
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if (handle != NULL) {
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oid_tvb = tvb_new_subset(gss_tvb, offset, -1, -1);
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len = call_dissector(handle, oid_tvb, pinfo,
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subtree);
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if (len == 0)
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return_offset = tvb_length(gss_tvb);
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else
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return_offset = offset + len;
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} else {
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proto_tree_add_text(subtree, gss_tvb, offset, -1,
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"Authentication credentials");
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return_offset = tvb_length(gss_tvb);
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}
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}
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done:
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;
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} CATCH(BoundsError) {
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RETHROW;
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} CATCH(ReportedBoundsError) {
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show_reported_bounds_error(gss_tvb, pinfo, tree);
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} ENDTRY;
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proto_item_set_len(item, return_offset);
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return return_offset;
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}
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static void
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dissect_gssapi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_gssapi_work(tvb, pinfo, tree, FALSE);
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}
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|
|
|
static int
|
|
dissect_gssapi_verf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
return dissect_gssapi_work(tvb, pinfo, tree, TRUE);
|
|
}
|
|
|
|
void
|
|
proto_register_gssapi(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_gssapi_oid,
|
|
{ "OID", "gssapi.OID", FT_STRING, BASE_NONE,
|
|
NULL, 0, "This is a GSS-API Object Identifier", HFILL }},
|
|
{ &hf_gssapi_segment,
|
|
{ "GSSAPI Segment", "gssapi.segment", FT_FRAMENUM, BASE_NONE,
|
|
NULL, 0x0, "GSSAPI Segment", HFILL }},
|
|
{ &hf_gssapi_segments,
|
|
{ "GSSAPI Segments", "gssapi.segment.segments", FT_NONE, BASE_NONE,
|
|
NULL, 0x0, "GSSAPI Segments", HFILL }},
|
|
{ &hf_gssapi_segment_overlap,
|
|
{ "Fragment overlap", "gssapi.segment.overlap", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0x0, "Fragment overlaps with other fragments", HFILL }},
|
|
{ &hf_gssapi_segment_overlap_conflict,
|
|
{ "Conflicting data in fragment overlap", "gssapi.segment.overlap.conflict", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0x0, "Overlapping fragments contained conflicting data", HFILL }},
|
|
{ &hf_gssapi_segment_multiple_tails,
|
|
{ "Multiple tail fragments found", "gssapi.segment.multipletails", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0x0, "Several tails were found when defragmenting the packet", HFILL }},
|
|
{ &hf_gssapi_segment_too_long_fragment,
|
|
{ "Fragment too long", "gssapi.segment.toolongfragment", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0x0, "Fragment contained data past end of packet", HFILL }},
|
|
{ &hf_gssapi_segment_error,
|
|
{ "Defragmentation error", "gssapi.segment.error", FT_FRAMENUM, BASE_NONE,
|
|
NULL, 0x0, "Defragmentation error due to illegal fragments", HFILL }},
|
|
{ &hf_gssapi_reassembled_in,
|
|
{ "Reassembled In", "gssapi.reassembled_in", FT_FRAMENUM, BASE_DEC,
|
|
NULL, 0x0, "The frame where this pdu is reassembled", HFILL }},
|
|
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_gssapi,
|
|
&ett_gssapi_segment,
|
|
&ett_gssapi_segments,
|
|
};
|
|
module_t *gssapi_module;
|
|
|
|
proto_gssapi = proto_register_protocol(
|
|
"GSS-API Generic Security Service Application Program Interface",
|
|
"GSS-API", "gss-api");
|
|
|
|
gssapi_module = prefs_register_protocol(proto_gssapi, NULL);
|
|
prefs_register_bool_preference(gssapi_module, "gssapi_reassembly",
|
|
"Reassemble fragmented GSSAPI blobs",
|
|
"Whether or not to try reassembling GSSAPI blobs spanning multiple (SMB/SessionSetup) PDUs",
|
|
&gssapi_reassembly);
|
|
proto_register_field_array(proto_gssapi, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
register_dissector("gssapi", dissect_gssapi, proto_gssapi);
|
|
new_register_dissector("gssapi_verf", dissect_gssapi_verf, proto_gssapi);
|
|
|
|
gssapi_oids = g_hash_table_new(gssapi_oid_hash, gssapi_oid_equal);
|
|
register_init_routine(gssapi_reassembly_init);
|
|
}
|
|
|
|
static int wrap_dissect_gssapi(tvbuff_t *tvb, int offset,
|
|
packet_info *pinfo,
|
|
proto_tree *tree, guint8 *drep _U_)
|
|
{
|
|
tvbuff_t *auth_tvb;
|
|
|
|
auth_tvb = tvb_new_subset(tvb, offset, -1, -1);
|
|
|
|
dissect_gssapi(auth_tvb, pinfo, tree);
|
|
|
|
return tvb_length_remaining(tvb, offset);
|
|
}
|
|
|
|
int wrap_dissect_gssapi_verf(tvbuff_t *tvb, int offset,
|
|
packet_info *pinfo,
|
|
proto_tree *tree, guint8 *drep _U_)
|
|
{
|
|
tvbuff_t *auth_tvb;
|
|
|
|
auth_tvb = tvb_new_subset(tvb, offset, -1, -1);
|
|
|
|
return dissect_gssapi_verf(auth_tvb, pinfo, tree);
|
|
}
|
|
|
|
tvbuff_t *
|
|
wrap_dissect_gssapi_payload(tvbuff_t *data_tvb,
|
|
tvbuff_t *auth_tvb,
|
|
int offset _U_,
|
|
packet_info *pinfo,
|
|
dcerpc_auth_info *auth_info _U_)
|
|
{
|
|
tvbuff_t *result;
|
|
|
|
/* we need a full auth and a full data tvb or else we cant
|
|
decrypt anything
|
|
*/
|
|
if((!auth_tvb)||(!data_tvb)){
|
|
return NULL;
|
|
}
|
|
|
|
pinfo->decrypt_gssapi_tvb=DECRYPT_GSSAPI_DCE;
|
|
pinfo->gssapi_wrap_tvb=NULL;
|
|
pinfo->gssapi_encrypted_tvb=data_tvb;
|
|
pinfo->gssapi_decrypted_tvb=NULL;
|
|
dissect_gssapi_verf(auth_tvb, pinfo, NULL);
|
|
result=pinfo->gssapi_decrypted_tvb;
|
|
|
|
pinfo->decrypt_gssapi_tvb=0;
|
|
pinfo->gssapi_wrap_tvb=NULL;
|
|
pinfo->gssapi_encrypted_tvb=NULL;
|
|
pinfo->gssapi_decrypted_tvb=NULL;
|
|
|
|
return result;
|
|
}
|
|
|
|
static dcerpc_auth_subdissector_fns gssapi_auth_fns = {
|
|
wrap_dissect_gssapi, /* Bind */
|
|
wrap_dissect_gssapi, /* Bind ACK */
|
|
wrap_dissect_gssapi, /* AUTH3 */
|
|
wrap_dissect_gssapi_verf, /* Request verifier */
|
|
wrap_dissect_gssapi_verf, /* Response verifier */
|
|
wrap_dissect_gssapi_payload, /* Request data */
|
|
wrap_dissect_gssapi_payload /* Response data */
|
|
};
|
|
|
|
void
|
|
proto_reg_handoff_gssapi(void)
|
|
{
|
|
dissector_handle_t gssapi_handle;
|
|
|
|
ntlmssp_handle = find_dissector("ntlmssp");
|
|
|
|
register_dcerpc_auth_subdissector(DCE_C_AUTHN_LEVEL_CONNECT,
|
|
DCE_C_RPC_AUTHN_PROTOCOL_SPNEGO,
|
|
&gssapi_auth_fns);
|
|
register_dcerpc_auth_subdissector(DCE_C_AUTHN_LEVEL_PKT_INTEGRITY,
|
|
DCE_C_RPC_AUTHN_PROTOCOL_SPNEGO,
|
|
&gssapi_auth_fns);
|
|
register_dcerpc_auth_subdissector(DCE_C_AUTHN_LEVEL_PKT_PRIVACY,
|
|
DCE_C_RPC_AUTHN_PROTOCOL_SPNEGO,
|
|
&gssapi_auth_fns);
|
|
|
|
gssapi_handle = create_dissector_handle(dissect_gssapi, proto_gssapi);
|
|
dissector_add_string("dns.tsig.mac", "gss.microsoft.com", gssapi_handle);
|
|
}
|