![Michael Mann](/assets/img/avatar_default.png)
I'm not sold on the name or module the proto_data functions live in, but I believe the function arguments are solid and gives us the most flexibility for the future. And search/replace of a function name is easy enough to do. The big driving force for getting this in sooner rather than later is the saved memory on ethernet packets (and IP packets soon), that used to have file_scope() proto data when all it needed was packet_scope() data (technically packet_info->pool scoped), strictly for Decode As. All dissectors that use p_add_proto_data() only for Decode As functionality have been converted to using packet_scope(). All other dissectors were converted to using file_scope() which was the original scope for "proto" data. svn path=/trunk/; revision=53520
694 lines
21 KiB
C
694 lines
21 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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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/exceptions.h>
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#include <epan/conversation.h>
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#include <epan/wmem/wmem.h>
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#include <epan/prefs.h>
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#include <epan/reassemble.h>
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#include <epan/asn1.h>
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#include <epan/to_str.h>
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#include <epan/show_exception.h>
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#include <epan/dissectors/packet-ber.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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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_segment_count = -1;
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static int hf_gssapi_reassembled_in = -1;
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static int hf_gssapi_reassembled_length = -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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wmem_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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&hf_gssapi_segment_count,
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NULL,
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&hf_gssapi_reassembled_length,
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/* Reassembled data field */
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NULL,
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"fragments"
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};
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static reassembly_table gssapi_reassembly_table;
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static void
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gssapi_reassembly_init(void)
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{
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reassembly_table_init(&gssapi_reassembly_table,
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&addresses_reassembly_table_functions);
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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;
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static dissector_handle_t ntlmssp_payload_handle;
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static dissector_handle_t ntlmssp_verf_handle;
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static dissector_handle_t ntlmssp_data_only_handle;
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static dissector_handle_t spnego_krb5_wrap_handle;
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static GHashTable *gssapi_oids;
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static gint
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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; key[i]; 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 = (gssapi_oid_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 = (gssapi_oid_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 *volatile item;
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proto_tree *volatile subtree;
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volatile int return_offset = 0;
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gssapi_conv_info_t *volatile 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, start_offset, oid_start_offset;
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volatile int offset;
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gint8 appclass;
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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_head *fd_head=NULL;
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gssapi_frag_info_t *fi;
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tvbuff_t *volatile gss_tvb=NULL;
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asn1_ctx_t asn1_ctx;
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void *pd_save;
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start_offset=0;
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offset=0;
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asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
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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_or_create_conversation(pinfo);
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gss_info = (gssapi_conv_info_t *)conversation_get_proto_data(conversation, proto_gssapi);
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if (!gss_info) {
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gss_info = wmem_new(wmem_file_scope(), 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=wmem_tree_new(wmem_file_scope());
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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, ENC_NA);
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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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pd_save = pinfo->private_data;
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TRY {
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gss_tvb=tvb;
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/* First of all, if it's 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=(gssapi_frag_info_t *)wmem_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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wmem_tree_insert32(gss_info->frags, pinfo->fd->num, fi);
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fd_head=fragment_add(&gssapi_reassembly_table,
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tvb, 0, pinfo, fi->first_frame, NULL,
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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_chain(tvb, fd_head->tvb_data);
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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=(gssapi_frag_info_t *)wmem_tree_lookup32(gss_info->frags, pinfo->fd->num);
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if(fi){
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fd_head=fragment_get(&gssapi_reassembly_table,
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pinfo, fi->first_frame, NULL);
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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_chain(tvb, fd_head->tvb_data);
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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, &appclass, &pc, &tag);
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offset = get_ber_length(gss_tvb, offset, &len1, &ind_field);
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if (!(appclass == BER_CLASS_APP && pc && tag == 0)) {
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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_length_remaining(gss_tvb, start_offset)>7) && (tvb_strneql(gss_tvb, start_offset, "NTLMSSP", 7) == 0)) {
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return_offset = call_dissector(ntlmssp_handle,
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tvb_new_subset_remaining(gss_tvb, start_offset),
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pinfo, subtree);
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goto done;
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}
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/* Maybe it's new NTLMSSP payload */
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if ((tvb_length_remaining(gss_tvb, start_offset)>16) &&
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((tvb_memeql(gss_tvb, start_offset, "\x01\x00\x00\x00", 4) == 0))) {
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return_offset = call_dissector(ntlmssp_payload_handle,
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tvb_new_subset_remaining(gss_tvb, start_offset),
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pinfo, subtree);
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pinfo->gssapi_data_encrypted = TRUE;
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goto done;
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}
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if ((tvb_length_remaining(gss_tvb, start_offset)==16) &&
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((tvb_memeql(gss_tvb, start_offset, "\x01\x00\x00\x00", 4) == 0))) {
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if( is_verifier ) {
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return_offset = call_dissector(ntlmssp_verf_handle,
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tvb_new_subset_remaining(gss_tvb, start_offset),
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pinfo, subtree);
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}
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else if( pinfo->gssapi_encrypted_tvb ) {
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return_offset = call_dissector(ntlmssp_data_only_handle,
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tvb_new_subset_remaining(pinfo->gssapi_encrypted_tvb, 0),
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pinfo, subtree);
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pinfo->gssapi_data_encrypted = TRUE;
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}
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goto done;
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}
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/* Maybe it's new GSSKRB5 CFX Wrapping */
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if ((tvb_length_remaining(gss_tvb, start_offset)>2) &&
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((tvb_memeql(gss_tvb, start_offset, "\04\x04", 2) == 0) ||
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(tvb_memeql(gss_tvb, start_offset, "\05\x04", 2) == 0))) {
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return_offset = call_dissector(spnego_krb5_wrap_handle,
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tvb_new_subset_remaining(gss_tvb, start_offset),
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pinfo, subtree);
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goto done;
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}
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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 = (gssapi_oid_value *)p_get_proto_data(wmem_file_scope(), pinfo, proto_gssapi, 0);
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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(wmem_file_scope(), pinfo, proto_gssapi, 0, gss_info->oid);
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}
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if (!oidvalue)
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{
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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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appclass, pc, tag);
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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_local;
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oid_tvb_local = tvb_new_subset_remaining(gss_tvb, start_offset);
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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_local, 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, &asn1_ctx, 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=wmem_new(wmem_file_scope(), 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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wmem_tree_insert32(gss_info->frags, pinfo->fd->num, fi);
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fragment_add(&gssapi_reassembly_table,
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gss_tvb, 0, pinfo, pinfo->fd->num, NULL,
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0, tvb_length(gss_tvb), TRUE);
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fragment_set_tot_len(&gssapi_reassembly_table,
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pinfo, pinfo->fd->num, NULL, 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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|
*/
|
|
|
|
if ((oidvalue == NULL) ||
|
|
!proto_is_protocol_enabled(oidvalue->proto)) {
|
|
/* No dissector for this oid */
|
|
proto_tree_add_text(subtree, gss_tvb, oid_start_offset, -1,
|
|
"Token object");
|
|
|
|
return_offset = tvb_length(gss_tvb);
|
|
goto done;
|
|
}
|
|
|
|
/* Save a pointer to the data for the OID for the
|
|
* GSSAPI protocol for this conversation.
|
|
*/
|
|
|
|
/*
|
|
* Now add the proto data ...
|
|
* but only if it is not already there.
|
|
*/
|
|
if(!gss_info->oid){
|
|
gss_info->oid=oidvalue;
|
|
}
|
|
|
|
if (is_verifier) {
|
|
handle = oidvalue->wrap_handle;
|
|
if (handle != NULL) {
|
|
oid_tvb = tvb_new_subset_remaining(gss_tvb, offset);
|
|
len = call_dissector(handle, oid_tvb, pinfo,
|
|
subtree);
|
|
if (len == 0)
|
|
return_offset = tvb_length(gss_tvb);
|
|
else
|
|
return_offset = offset + len;
|
|
} else {
|
|
proto_tree_add_text(subtree, gss_tvb, offset, -1,
|
|
"Authentication verifier");
|
|
return_offset = tvb_length(gss_tvb);
|
|
}
|
|
} else {
|
|
handle = oidvalue->handle;
|
|
if (handle != NULL) {
|
|
oid_tvb = tvb_new_subset_remaining(gss_tvb, offset);
|
|
len = call_dissector(handle, oid_tvb, pinfo,
|
|
subtree);
|
|
if (len == 0)
|
|
return_offset = tvb_length(gss_tvb);
|
|
else
|
|
return_offset = offset + len;
|
|
} else {
|
|
proto_tree_add_text(subtree, gss_tvb, offset, -1,
|
|
"Authentication credentials");
|
|
return_offset = tvb_length(gss_tvb);
|
|
}
|
|
}
|
|
|
|
done:
|
|
;
|
|
} CATCH_NONFATAL_ERRORS {
|
|
/*
|
|
* Somebody threw an exception that means that there
|
|
* was a problem dissecting the payload; that means
|
|
* that a dissector was found, so we don't need to
|
|
* dissect the payload as data or update the protocol
|
|
* or info columns.
|
|
*
|
|
* Just show the exception and then drive on to show
|
|
* the trailer, after noting that a dissector was found
|
|
* and restoring the protocol value that was in effect
|
|
* before we called the subdissector.
|
|
*
|
|
* Restore the private_data structure in case one of the
|
|
* called dissectors modified it (and, due to the exception,
|
|
* was unable to restore it).
|
|
*/
|
|
pinfo->private_data = pd_save;
|
|
show_exception(gss_tvb, pinfo, tree, EXCEPT_CODE, GET_MESSAGE);
|
|
} ENDTRY;
|
|
|
|
proto_item_set_len(item, return_offset);
|
|
return return_offset;
|
|
}
|
|
|
|
static void
|
|
dissect_gssapi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_gssapi_work(tvb, pinfo, tree, FALSE);
|
|
}
|
|
|
|
static int
|
|
dissect_gssapi_verf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
|
|
{
|
|
return dissect_gssapi_work(tvb, pinfo, tree, TRUE);
|
|
}
|
|
|
|
void
|
|
proto_register_gssapi(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_gssapi_oid,
|
|
{ "OID", "gss-api.OID", FT_STRING, BASE_NONE,
|
|
NULL, 0, "This is a GSS-API Object Identifier", HFILL }},
|
|
{ &hf_gssapi_segment,
|
|
{ "GSSAPI Segment", "gss-api.segment", FT_FRAMENUM, BASE_NONE,
|
|
NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_gssapi_segments,
|
|
{ "GSSAPI Segments", "gss-api.segment.segments", FT_NONE, BASE_NONE,
|
|
NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_gssapi_segment_overlap,
|
|
{ "Fragment overlap", "gss-api.segment.overlap", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0x0, "Fragment overlaps with other fragments", HFILL }},
|
|
{ &hf_gssapi_segment_overlap_conflict,
|
|
{ "Conflicting data in fragment overlap", "gss-api.segment.overlap.conflict", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0x0, "Overlapping fragments contained conflicting data", HFILL }},
|
|
{ &hf_gssapi_segment_multiple_tails,
|
|
{ "Multiple tail fragments found", "gss-api.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", "gss-api.segment.toolongfragment", FT_BOOLEAN, BASE_NONE,
|
|
NULL, 0x0, "Fragment contained data past end of packet", HFILL }},
|
|
{ &hf_gssapi_segment_error,
|
|
{ "Defragmentation error", "gss-api.segment.error", FT_FRAMENUM, BASE_NONE,
|
|
NULL, 0x0, "Defragmentation error due to illegal fragments", HFILL }},
|
|
{ &hf_gssapi_segment_count,
|
|
{ "Fragment count", "gss-api.segment.count", FT_UINT32, BASE_DEC,
|
|
NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_gssapi_reassembled_in,
|
|
{ "Reassembled In", "gss-api.reassembled_in", FT_FRAMENUM, BASE_NONE,
|
|
NULL, 0x0, "The frame where this pdu is reassembled", HFILL }},
|
|
{ &hf_gssapi_reassembled_length,
|
|
{ "Reassembled GSSAPI length", "gss-api.reassembled.length", FT_UINT32, BASE_DEC,
|
|
NULL, 0x0, "The total length of the reassembled payload", 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, dcerpc_info *di _U_, guint8 *drep _U_)
|
|
{
|
|
tvbuff_t *auth_tvb;
|
|
|
|
auth_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
|
|
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, dcerpc_info *di _U_, guint8 *drep _U_)
|
|
{
|
|
tvbuff_t *auth_tvb;
|
|
|
|
auth_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
|
|
return dissect_gssapi_verf(auth_tvb, pinfo, tree, NULL);
|
|
}
|
|
|
|
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(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");
|
|
ntlmssp_payload_handle = find_dissector("ntlmssp_payload");
|
|
ntlmssp_verf_handle = find_dissector("ntlmssp_verf");
|
|
ntlmssp_data_only_handle = find_dissector("ntlmssp_data_only");
|
|
spnego_krb5_wrap_handle = find_dissector("spnego-krb5-wrap");
|
|
|
|
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 = find_dissector("gssapi");
|
|
dissector_add_string("dns.tsig.mac", "gss.microsoft.com", gssapi_handle);
|
|
}
|