forked from osmocom/wireshark
1700 lines
45 KiB
C
1700 lines
45 KiB
C
/* packet-spnego.c
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* Routines for the simple and protected GSS-API negotiation mechanism
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* as described in RFC 2478.
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* Copyright 2002, Tim Potter <tpot@samba.org>
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* Copyright 2002, Richard Sharpe <rsharpe@ns.aus.com>
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* Copyright 2003, Richard Sharpe <rsharpe@richardsharpe.com>
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*
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* $Id$
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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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/asn1.h>
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#include "format-oid.h"
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#include "packet-gssapi.h"
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#include "packet-kerberos.h"
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#include <epan/conversation.h>
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#define SPNEGO_negTokenInit 0
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#define SPNEGO_negTokenTarg 1
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#define SPNEGO_mechTypes 0
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#define SPNEGO_reqFlags 1
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#define SPNEGO_mechToken 2
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#define SPNEGO_mechListMIC 3
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#define SPNEGO_negResult 0
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#define SPNEGO_supportedMech 1
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#define SPNEGO_responseToken 2
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#define SPNEGO_negResult_accept_completed 0
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#define SPNEGO_negResult_accept_incomplete 1
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#define SPNEGO_negResult_accept_reject 2
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static int proto_spnego = -1;
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static int proto_spnego_krb5 = -1;
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static int hf_spnego = -1;
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static int hf_spnego_negtokeninit = -1;
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static int hf_spnego_negtokentarg = -1;
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static int hf_spnego_mechtype = -1;
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static int hf_spnego_mechtoken = -1;
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static int hf_spnego_negtokentarg_negresult = -1;
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static int hf_spnego_mechlistmic = -1;
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static int hf_spnego_responsetoken = -1;
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static int hf_spnego_reqflags = -1;
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static int hf_spnego_wraptoken = -1;
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static int hf_spnego_krb5 = -1;
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static int hf_spnego_krb5_tok_id = -1;
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static int hf_spnego_krb5_sgn_alg = -1;
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static int hf_spnego_krb5_seal_alg = -1;
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static int hf_spnego_krb5_snd_seq = -1;
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static int hf_spnego_krb5_sgn_cksum = -1;
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static int hf_spnego_krb5_confounder = -1;
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static int hf_gssapi_reqflags_deleg = -1;
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static int hf_gssapi_reqflags_mutual = -1;
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static int hf_gssapi_reqflags_replay = -1;
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static int hf_gssapi_reqflags_sequence = -1;
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static int hf_gssapi_reqflags_anon = -1;
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static int hf_gssapi_reqflags_conf = -1;
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static int hf_gssapi_reqflags_integ = -1;
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static gint ett_spnego = -1;
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static gint ett_spnego_negtokeninit = -1;
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static gint ett_spnego_negtokentarg = -1;
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static gint ett_spnego_mechtype = -1;
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static gint ett_spnego_mechtoken = -1;
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static gint ett_spnego_mechlistmic = -1;
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static gint ett_spnego_responsetoken = -1;
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static gint ett_spnego_wraptoken = -1;
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static gint ett_spnego_krb5 = -1;
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static gint ett_spnego_reqflags = -1;
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static const value_string spnego_negResult_vals[] = {
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{ SPNEGO_negResult_accept_completed, "Accept Completed" },
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{ SPNEGO_negResult_accept_incomplete, "Accept Incomplete" },
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{ SPNEGO_negResult_accept_reject, "Accept Reject"},
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{ 0, NULL}
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};
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/*
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* These should be in the GSSAPI dissector ... XXX
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*/
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static const true_false_string tfs_reqflags_deleg = {
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"Delegation Requested",
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"Delegation NOT Requested"
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};
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static const true_false_string tfs_reqflags_mutual = {
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"Mutual Authentication Requested",
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"Mutual Authentication NOT Requested"
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};
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static const true_false_string tfs_reqflags_replay = {
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"Replay Detection Requested",
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"Replay Detection NOT Requested"
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};
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static const true_false_string tfs_reqflags_sequence = {
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"Out-of-sequence Detection Requested",
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"Out-of-sequence Detection NOT Requested"
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};
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static const true_false_string tfs_reqflags_anon = {
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"Anonymous Authentication Requested",
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"Anonymous Authentication NOT Requested"
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};
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static const true_false_string tfs_reqflags_conf = {
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"Per-message Confidentiality Requested",
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"Per-message Confidentiality NOT Requested"
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};
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static const true_false_string tfs_reqflags_integ = {
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"Per-message Integrity Requested",
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"Per-message Integrity NOT Requested"
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};
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/* Display an ASN1 parse error. Taken from packet-snmp.c */
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static dissector_handle_t data_handle;
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static dissector_handle_t
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gssapi_dissector_handle(gssapi_oid_value *next_level_value) {
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if (next_level_value == NULL) {
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return NULL;
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}
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return next_level_value->handle;
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}
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static void
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dissect_parse_error(tvbuff_t *tvb, int offset, packet_info *pinfo,
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proto_tree *tree, const char *field_name, int ret)
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{
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char *errstr;
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errstr = asn1_err_to_str(ret);
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if (tree != NULL) {
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proto_tree_add_text(tree, tvb, offset, 0,
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"ERROR: Couldn't parse %s: %s", field_name, errstr);
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call_dissector(data_handle,
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tvb_new_subset(tvb, offset, -1, -1), pinfo, tree);
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}
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}
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/*
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* This is the SPNEGO KRB5 dissector. It is not true KRB5, but some ASN.1
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* wrapped blob with an OID, USHORT token ID, and a Ticket, that is also
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* ASN.1 wrapped by the looks of it. It conforms to RFC1964.
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*/
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#define KRB_TOKEN_AP_REQ 0x0001
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#define KRB_TOKEN_AP_REP 0x0002
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#define KRB_TOKEN_AP_ERR 0x0003
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#define KRB_TOKEN_GETMIC 0x0101
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#define KRB_TOKEN_WRAP 0x0102
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#define KRB_TOKEN_DELETE_SEC_CONTEXT 0x0201
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static const value_string spnego_krb5_tok_id_vals[] = {
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{ KRB_TOKEN_AP_REQ, "KRB5_AP_REQ"},
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{ KRB_TOKEN_AP_REP, "KRB5_AP_REP"},
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{ KRB_TOKEN_AP_ERR, "KRB5_ERROR"},
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{ KRB_TOKEN_GETMIC, "KRB5_GSS_GetMIC" },
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{ KRB_TOKEN_WRAP, "KRB5_GSS_Wrap" },
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{ KRB_TOKEN_DELETE_SEC_CONTEXT, "KRB5_GSS_Delete_sec_context" },
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{ 0, NULL}
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};
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#define KRB_SGN_ALG_DES_MAC_MD5 0x0000
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#define KRB_SGN_ALG_MD2_5 0x0001
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#define KRB_SGN_ALG_DES_MAC 0x0002
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#define KRB_SGN_ALG_HMAC 0x0011
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static const value_string spnego_krb5_sgn_alg_vals[] = {
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{ KRB_SGN_ALG_DES_MAC_MD5, "DES MAC MD5"},
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{ KRB_SGN_ALG_MD2_5, "MD2.5"},
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{ KRB_SGN_ALG_DES_MAC, "DES MAC"},
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{ KRB_SGN_ALG_HMAC, "HMAC"},
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{ 0, NULL}
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};
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#define KRB_SEAL_ALG_DES_CBC 0x0000
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#define KRB_SEAL_ALG_RC4 0x0010
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#define KRB_SEAL_ALG_NONE 0xffff
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static const value_string spnego_krb5_seal_alg_vals[] = {
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{ KRB_SEAL_ALG_DES_CBC, "DES CBC"},
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{ KRB_SEAL_ALG_RC4, "RC4"},
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{ KRB_SEAL_ALG_NONE, "None"},
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{ 0, NULL}
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};
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/*
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* XXX - is this for SPNEGO or just GSS-API?
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* RFC 1964 is "The Kerberos Version 5 GSS-API Mechanism"; presumably one
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* can directly designate Kerberos V5 as a mechanism in GSS-API, rather
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* than designating SPNEGO as the mechanism, offering Kerberos V5, and
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* getting it accepted.
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*/
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static int
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dissect_spnego_krb5_getmic_base(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree);
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static int
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dissect_spnego_krb5_wrap_base(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, guint16 token_id);
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static void
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dissect_spnego_krb5(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *item;
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proto_tree *subtree;
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int ret, offset = 0;
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ASN1_SCK hnd;
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gboolean def;
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guint len1, cls, con, tag, oid_len, nbytes;
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guint16 token_id;
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subid_t *oid;
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gchar *oid_string;
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gssapi_oid_value *value;
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tvbuff_t *krb5_tvb;
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item = proto_tree_add_item(tree, hf_spnego_krb5, tvb, offset,
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-1, FALSE);
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subtree = proto_item_add_subtree(item, ett_spnego_krb5);
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/*
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* The KRB5 blob conforms to RFC1964:
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* [APPLICATION 0] {
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* OID,
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* USHORT (0x0001 == AP-REQ, 0x0002 == AP-REP, 0x0003 == ERROR),
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* OCTET STRING }
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*
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* However, for some protocols, the KRB5 blob starts at the SHORT
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* and has no DER encoded header etc.
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*
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* It appears that for some other protocols the KRB5 blob is just
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* a Kerberos message, with no [APPLICATION 0] header, no OID,
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* and no USHORT.
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*
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* So:
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*
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* If we see an [APPLICATION 0] HEADER, we show the OID and
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* the USHORT, and then dissect the rest as a Kerberos message.
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*
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* If we see an [APPLICATION 14] or [APPLICATION 15] header,
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* we assume it's an AP-REQ or AP-REP message, and dissect
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* it all as a Kerberos message.
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*
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* Otherwise, we show the USHORT, and then dissect the rest
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* as a Kerberos message.
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*/
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asn1_open(&hnd, tvb, offset);
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/*
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* Get the first header ...
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*/
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ret = asn1_header_decode(&hnd, &cls, &con, &tag, &def, &len1);
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if (ret != ASN1_ERR_NOERROR) {
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dissect_parse_error(tvb, offset, pinfo, subtree,
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"SPNEGO KRB5 Header", ret);
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goto done;
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}
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if (cls == ASN1_APL && con == ASN1_CON) {
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/*
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* [APPLICATION <tag>]
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*/
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switch (tag) {
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case 0:
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/*
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* [APPLICATION 0]
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*/
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offset = hnd.offset;
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/* Next, the OID */
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ret = asn1_oid_decode(&hnd, &oid, &oid_len, &nbytes);
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if (ret != ASN1_ERR_NOERROR) {
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dissect_parse_error(tvb, offset, pinfo, subtree,
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"SPNEGO supportedMech token", ret);
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goto done;
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}
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oid_string = format_oid(oid, oid_len);
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value = gssapi_lookup_oid(oid, oid_len);
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if (value)
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proto_tree_add_text(subtree, tvb, offset, nbytes,
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"OID: %s (%s)",
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oid_string, value->comment);
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else
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proto_tree_add_text(subtree, tvb, offset, nbytes,
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"OID: %s",
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oid_string);
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g_free(oid_string);
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offset += nbytes;
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/* Next, the token ID ... */
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token_id = tvb_get_letohs(tvb, offset);
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proto_tree_add_uint(subtree, hf_spnego_krb5_tok_id, tvb, offset, 2,
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token_id);
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hnd.offset += 2;
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offset += 2;
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break;
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case 14: /* [APPLICATION 14] */
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case 15: /* [APPLICATION 15] */
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/*
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* No token ID - just dissect as a Kerberos message and
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* return.
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*/
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krb5_tvb = tvb_new_subset(tvb, offset, -1, -1);
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offset = dissect_kerberos_main(krb5_tvb, pinfo, subtree, FALSE, NULL);
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return;
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default:
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proto_tree_add_text(subtree, tvb, offset, 0,
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"Unknown header (cls=%d, con=%d, tag=%d)",
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cls, con, tag);
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goto done;
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}
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} else {
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/* Next, the token ID ... */
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token_id = tvb_get_letohs(tvb, offset);
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proto_tree_add_uint(subtree, hf_spnego_krb5_tok_id, tvb, offset, 2,
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token_id);
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hnd.offset += 2;
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offset += 2;
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}
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switch (token_id) {
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case KRB_TOKEN_AP_REQ:
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case KRB_TOKEN_AP_REP:
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case KRB_TOKEN_AP_ERR:
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krb5_tvb = tvb_new_subset(tvb, offset, -1, -1);
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offset = dissect_kerberos_main(krb5_tvb, pinfo, subtree, FALSE, NULL);
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break;
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case KRB_TOKEN_GETMIC:
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offset = dissect_spnego_krb5_getmic_base(tvb, offset, pinfo, subtree);
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break;
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case KRB_TOKEN_WRAP:
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offset = dissect_spnego_krb5_wrap_base(tvb, offset, pinfo, subtree, token_id);
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break;
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case KRB_TOKEN_DELETE_SEC_CONTEXT:
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break;
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default:
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break;
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}
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done:
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return;
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}
|
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|
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/*
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* XXX - This is for GSSAPI Wrap tokens ...
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*/
|
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static int
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dissect_spnego_krb5_wrap_base(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, guint16 _U_ token_id)
|
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{
|
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guint16 sgn_alg;
|
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|
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/*
|
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* The KRB5 blob conforms to RFC1964:
|
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* USHORT (0x0102 == GSS_Wrap)
|
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* and so on }
|
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*/
|
|
|
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/* Now, the sign and seal algorithms ... */
|
|
|
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sgn_alg = tvb_get_letohs(tvb, offset);
|
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proto_tree_add_uint(tree, hf_spnego_krb5_sgn_alg, tvb, offset, 2,
|
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sgn_alg);
|
|
|
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offset += 2;
|
|
|
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proto_tree_add_item(tree, hf_spnego_krb5_seal_alg, tvb, offset, 2,
|
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TRUE);
|
|
|
|
offset += 2;
|
|
|
|
/* Skip the filler */
|
|
|
|
offset += 2;
|
|
|
|
/* Encrypted sequence number */
|
|
|
|
proto_tree_add_item(tree, hf_spnego_krb5_snd_seq, tvb, offset, 8,
|
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TRUE);
|
|
|
|
offset += 8;
|
|
|
|
/* Checksum of plaintext padded data */
|
|
|
|
proto_tree_add_item(tree, hf_spnego_krb5_sgn_cksum, tvb, offset, 8,
|
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TRUE);
|
|
|
|
offset += 8;
|
|
|
|
/*
|
|
* At least according to draft-brezak-win2k-krb-rc4-hmac-04,
|
|
* if the signing algorithm is KRB_SGN_ALG_HMAC, there's an
|
|
* extra 8 bytes of "Random confounder" after the checksum.
|
|
* It certainly confounds code expecting all Kerberos 5
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* GSS_Wrap() tokens to look the same....
|
|
*/
|
|
if (sgn_alg == KRB_SGN_ALG_HMAC) {
|
|
proto_tree_add_item(tree, hf_spnego_krb5_confounder, tvb, offset, 8,
|
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TRUE);
|
|
|
|
offset += 8;
|
|
}
|
|
|
|
/*
|
|
* Return the offset past the checksum, so that we know where
|
|
* the data we're wrapped around starts. Also, set the length
|
|
* of our top-level item to that offset, so it doesn't cover
|
|
* the data we're wrapped around.
|
|
*
|
|
* Note that for DCERPC the GSSAPI blobs comes after the data it wraps,
|
|
* not before.
|
|
*/
|
|
return offset;
|
|
}
|
|
|
|
/*
|
|
* XXX - This is for GSSAPI GetMIC tokens ...
|
|
*/
|
|
static int
|
|
dissect_spnego_krb5_getmic_base(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
guint16 sgn_alg;
|
|
|
|
/*
|
|
* The KRB5 blob conforms to RFC1964:
|
|
* USHORT (0x0101 == GSS_GetMIC)
|
|
* and so on }
|
|
*/
|
|
|
|
/* Now, the sign algorithm ... */
|
|
|
|
sgn_alg = tvb_get_letohs(tvb, offset);
|
|
proto_tree_add_uint(tree, hf_spnego_krb5_sgn_alg, tvb, offset, 2,
|
|
sgn_alg);
|
|
|
|
offset += 2;
|
|
|
|
/* Skip the filler */
|
|
|
|
offset += 4;
|
|
|
|
/* Encrypted sequence number */
|
|
|
|
proto_tree_add_item(tree, hf_spnego_krb5_snd_seq, tvb, offset, 8,
|
|
TRUE);
|
|
|
|
offset += 8;
|
|
|
|
/* Checksum of plaintext padded data */
|
|
|
|
proto_tree_add_item(tree, hf_spnego_krb5_sgn_cksum, tvb, offset, 8,
|
|
TRUE);
|
|
|
|
offset += 8;
|
|
|
|
/*
|
|
* At least according to draft-brezak-win2k-krb-rc4-hmac-04,
|
|
* if the signing algorithm is KRB_SGN_ALG_HMAC, there's an
|
|
* extra 8 bytes of "Random confounder" after the checksum.
|
|
* It certainly confounds code expecting all Kerberos 5
|
|
* GSS_Wrap() tokens to look the same....
|
|
*/
|
|
if (sgn_alg == KRB_SGN_ALG_HMAC) {
|
|
proto_tree_add_item(tree, hf_spnego_krb5_confounder, tvb, offset, 8,
|
|
TRUE);
|
|
|
|
offset += 8;
|
|
}
|
|
|
|
/*
|
|
* Return the offset past the checksum, so that we know where
|
|
* the data we're wrapped around starts. Also, set the length
|
|
* of our top-level item to that offset, so it doesn't cover
|
|
* the data we're wrapped around.
|
|
*/
|
|
|
|
return offset;
|
|
}
|
|
|
|
/*
|
|
* XXX - is this for SPNEGO or just GSS-API?
|
|
* RFC 1964 is "The Kerberos Version 5 GSS-API Mechanism"; presumably one
|
|
* can directly designate Kerberos V5 as a mechanism in GSS-API, rather
|
|
* than designating SPNEGO as the mechanism, offering Kerberos V5, and
|
|
* getting it accepted.
|
|
*/
|
|
static int
|
|
dissect_spnego_krb5_wrap(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
proto_item *item;
|
|
proto_tree *subtree;
|
|
int offset = 0;
|
|
guint16 token_id;
|
|
|
|
item = proto_tree_add_item(tree, hf_spnego_krb5, tvb, 0, -1, FALSE);
|
|
|
|
subtree = proto_item_add_subtree(item, ett_spnego_krb5);
|
|
|
|
/*
|
|
* The KRB5 blob conforms to RFC1964:
|
|
* USHORT (0x0102 == GSS_Wrap)
|
|
* and so on }
|
|
*/
|
|
|
|
/* First, the token ID ... */
|
|
|
|
token_id = tvb_get_letohs(tvb, offset);
|
|
proto_tree_add_item(subtree, hf_spnego_krb5_tok_id, tvb, offset, 2,
|
|
TRUE);
|
|
|
|
offset += 2;
|
|
|
|
offset = dissect_spnego_krb5_wrap_base(tvb, offset, pinfo, subtree, token_id);
|
|
|
|
/*
|
|
* Return the offset past the checksum, so that we know where
|
|
* the data we're wrapped around starts. Also, set the length
|
|
* of our top-level item to that offset, so it doesn't cover
|
|
* the data we're wrapped around.
|
|
*/
|
|
proto_item_set_len(item, offset);
|
|
return offset;
|
|
}
|
|
|
|
/* Spnego stuff from here */
|
|
|
|
static int
|
|
dissect_spnego_mechTypes(tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
proto_tree *tree, ASN1_SCK *hnd,
|
|
gssapi_oid_value **next_level_value_p)
|
|
{
|
|
proto_item *item = NULL;
|
|
proto_tree *subtree = NULL;
|
|
gboolean def;
|
|
guint len1, len, cls, con, tag, nbytes;
|
|
subid_t *oid;
|
|
gchar *oid_string;
|
|
int ret;
|
|
gboolean saw_mechanism = FALSE;
|
|
|
|
/*
|
|
* MechTypeList ::= SEQUENCE OF MechType
|
|
*/
|
|
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &len1);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, subtree,
|
|
"SPNEGO last sequence header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_UNI && con == ASN1_CON && tag == ASN1_SEQ)) {
|
|
proto_tree_add_text(
|
|
subtree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
offset = hnd->offset;
|
|
|
|
item = proto_tree_add_item(tree, hf_spnego_mechtype, tvb, offset,
|
|
len1, FALSE);
|
|
subtree = proto_item_add_subtree(item, ett_spnego_mechtype);
|
|
|
|
/*
|
|
* Now, the object IDs ... We should translate them: FIXME
|
|
*/
|
|
|
|
while (len1) {
|
|
gssapi_oid_value *value;
|
|
|
|
ret = asn1_oid_decode(hnd, &oid, &len, &nbytes);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, subtree,
|
|
"SPNEGO mechTypes token", ret);
|
|
goto done;
|
|
}
|
|
|
|
oid_string = format_oid(oid, len);
|
|
value = gssapi_lookup_oid(oid, len);
|
|
if (value)
|
|
proto_tree_add_text(subtree, tvb, offset, nbytes, "OID: %s (%s)",
|
|
oid_string, value->comment);
|
|
else
|
|
proto_tree_add_text(subtree, tvb, offset, nbytes, "OID: %s",
|
|
oid_string);
|
|
|
|
g_free(oid_string);
|
|
|
|
/*
|
|
* Tell our caller the first mechanism we see, so that if
|
|
* this is a negTokenInit with a mechToken, it can interpret
|
|
* the mechToken according to the first mechType. (There
|
|
* might not have been any indication of the mechType
|
|
* in prior frames, so we can't necessarily use the
|
|
* mechanism from the conversation; i.e., a negTokenInit
|
|
* can contain the initial security token for the desired
|
|
* mechanism of the initiator - that's the first mechanism
|
|
* in the list.)
|
|
*/
|
|
if (!saw_mechanism) {
|
|
if (value)
|
|
*next_level_value_p = value;
|
|
saw_mechanism = TRUE;
|
|
}
|
|
|
|
offset += nbytes;
|
|
len1 -= nbytes;
|
|
|
|
}
|
|
|
|
done:
|
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
static int
|
|
dissect_spnego_reqFlags(tvbuff_t *tvb, int offset, packet_info *pinfo _U_,
|
|
proto_tree *tree, ASN1_SCK *hnd)
|
|
{
|
|
gboolean def;
|
|
guint len1, cls, con, tag, flags;
|
|
int ret;
|
|
proto_item *item;
|
|
proto_tree *subtree;
|
|
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &len1);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, tree,
|
|
"SPNEGO reqFlags header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_BTS)) {
|
|
proto_tree_add_text(
|
|
tree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
/* We must have a Bit String ... insert it */
|
|
|
|
offset = hnd->offset;
|
|
|
|
flags = tvb_get_guint8(tvb, offset);
|
|
|
|
item = proto_tree_add_item(tree, hf_spnego_reqflags, tvb, offset, len1,
|
|
FALSE);
|
|
|
|
subtree = proto_item_add_subtree(item, ett_spnego_reqflags);
|
|
|
|
/*
|
|
* Now, the bits. XXX: Assume 8 bits. FIXME.
|
|
*/
|
|
|
|
proto_tree_add_boolean(subtree, hf_gssapi_reqflags_deleg, tvb, offset, len1, flags);
|
|
proto_tree_add_boolean(subtree, hf_gssapi_reqflags_mutual, tvb, offset, len1, flags);
|
|
proto_tree_add_boolean(subtree, hf_gssapi_reqflags_replay, tvb, offset, len1, flags);
|
|
proto_tree_add_boolean(subtree, hf_gssapi_reqflags_sequence, tvb, offset, len1, flags);
|
|
proto_tree_add_boolean(subtree, hf_gssapi_reqflags_anon, tvb, offset, len1, flags);
|
|
proto_tree_add_boolean(subtree, hf_gssapi_reqflags_conf, tvb, offset, len1, flags);
|
|
proto_tree_add_boolean(subtree, hf_gssapi_reqflags_integ, tvb, offset, len1, flags);
|
|
|
|
hnd->offset += len1;
|
|
|
|
done:
|
|
return offset + len1;
|
|
|
|
}
|
|
|
|
static int
|
|
dissect_spnego_mechToken(tvbuff_t *tvb, int offset, packet_info *pinfo _U_,
|
|
proto_tree *tree, ASN1_SCK *hnd,
|
|
dissector_handle_t next_level_dissector)
|
|
{
|
|
proto_item *item;
|
|
proto_tree *subtree;
|
|
gboolean def;
|
|
int ret;
|
|
guint cls, con, tag, nbytes;
|
|
gint length_remaining, reported_length_remaining;
|
|
tvbuff_t *token_tvb;
|
|
|
|
/*
|
|
* This appears to be a simple octet string ...
|
|
*/
|
|
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &nbytes);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, tree,
|
|
"SPNEGO sequence header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_OTS)) {
|
|
proto_tree_add_text(
|
|
tree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
offset = hnd->offset;
|
|
|
|
|
|
/* Dont try to create an item with more bytes than remains in the
|
|
* frame or we will not even attempt to dissect those bytes we
|
|
* do have. (since there will be an exception)
|
|
*
|
|
* We use "tvb_ensure_length_remaining()" so that we throw
|
|
* an exception if there's nothing to dissect.
|
|
*/
|
|
length_remaining = tvb_ensure_length_remaining(tvb,offset);
|
|
reported_length_remaining = tvb_reported_length_remaining(tvb,offset);
|
|
if ((guint)length_remaining > nbytes)
|
|
length_remaining = nbytes;
|
|
if ((guint)reported_length_remaining > nbytes)
|
|
reported_length_remaining = nbytes;
|
|
item = proto_tree_add_item(tree, hf_spnego_mechtoken, tvb, offset,
|
|
length_remaining, FALSE);
|
|
subtree = proto_item_add_subtree(item, ett_spnego_mechtoken);
|
|
|
|
/*
|
|
* Now, we should be able to dispatch after creating a new TVB.
|
|
*/
|
|
|
|
token_tvb = tvb_new_subset(tvb, offset, length_remaining,
|
|
reported_length_remaining);
|
|
if (next_level_dissector)
|
|
call_dissector(next_level_dissector, token_tvb, pinfo, subtree);
|
|
|
|
hnd->offset += nbytes; /* Update this ... */
|
|
|
|
done:
|
|
return offset + nbytes;
|
|
}
|
|
|
|
static int
|
|
dissect_spnego_mechListMIC(tvbuff_t *tvb, int offset, packet_info *pinfo _U_,
|
|
proto_tree *tree, ASN1_SCK *hnd,
|
|
dissector_handle_t next_level_dissector)
|
|
{
|
|
guint len1, cls, con, tag;
|
|
int ret;
|
|
gboolean def;
|
|
proto_tree *subtree = NULL;
|
|
|
|
/*
|
|
* Add the mechListMIC [3] Octet String or General String ...
|
|
*/
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &len1);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, subtree,
|
|
"SPNEGO sequence header", ret);
|
|
goto done;
|
|
}
|
|
|
|
offset = hnd->offset;
|
|
|
|
if (cls == ASN1_UNI && con == ASN1_CON && tag == ASN1_SEQ) {
|
|
|
|
/*
|
|
* There seems to be two different forms this can take
|
|
* One as an Octet string, and one as a general string in a
|
|
* sequence ... We will have to dissect this later
|
|
*/
|
|
|
|
proto_tree_add_text(tree, tvb, offset + 4, len1 - 4,
|
|
"mechListMIC: %s",
|
|
tvb_format_text(tvb, offset + 4, len1 - 4));
|
|
|
|
/* Naughty ... but we have to adjust for what we never took */
|
|
|
|
hnd->offset += len1;
|
|
offset += len1;
|
|
|
|
}
|
|
else if (cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_OTS) {
|
|
tvbuff_t *token_tvb;
|
|
proto_item *item;
|
|
proto_tree *subtree;
|
|
|
|
item = proto_tree_add_item(tree, hf_spnego_mechlistmic, tvb, offset,
|
|
len1, FALSE);
|
|
subtree = proto_item_add_subtree(item, ett_spnego_mechlistmic);
|
|
|
|
/*
|
|
* Now, we should be able to dispatch after creating a new TVB.
|
|
*/
|
|
|
|
token_tvb = tvb_new_subset(tvb, offset, len1, -1);
|
|
if (next_level_dissector)
|
|
call_dissector(next_level_dissector, token_tvb, pinfo, subtree);
|
|
|
|
hnd->offset += len1; /* Update this ... */
|
|
offset += len1;
|
|
|
|
}
|
|
else {
|
|
|
|
proto_tree_add_text(subtree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
done:
|
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
static int
|
|
dissect_spnego_negTokenInit(tvbuff_t *tvb, int offset, packet_info *pinfo _U_,
|
|
proto_tree *tree, ASN1_SCK *hnd,
|
|
gssapi_oid_value **next_level_value_p)
|
|
{
|
|
proto_item *item;
|
|
proto_tree *subtree;
|
|
gboolean def;
|
|
guint len1, len, cls, con, tag;
|
|
int ret;
|
|
|
|
item = proto_tree_add_item( tree, hf_spnego_negtokeninit, tvb, offset,
|
|
-1, FALSE);
|
|
subtree = proto_item_add_subtree(item, ett_spnego_negtokeninit);
|
|
|
|
/*
|
|
* Here is what we need to get ...
|
|
* NegTokenInit ::= SEQUENCE {
|
|
* mechTypes [0] MechTypeList OPTIONAL,
|
|
* reqFlags [1] ContextFlags OPTIONAL,
|
|
* mechToken [2] OCTET STRING OPTIONAL,
|
|
* mechListMIC [3] OCTET STRING OPTIONAL }
|
|
|
|
*/
|
|
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &len1);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, subtree,
|
|
"SPNEGO sequence header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_UNI && con == ASN1_CON && tag == ASN1_SEQ)) {
|
|
proto_tree_add_text(
|
|
subtree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
offset = hnd->offset;
|
|
|
|
while (len1) {
|
|
int hdr_ofs;
|
|
|
|
hdr_ofs = hnd->offset;
|
|
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &len);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, subtree,
|
|
"SPNEGO context header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_CTX && con == ASN1_CON)) {
|
|
proto_tree_add_text(subtree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
/* Adjust for the length of the header */
|
|
|
|
len1 -= (hnd->offset - hdr_ofs);
|
|
|
|
/* Should be one of the fields */
|
|
|
|
switch (tag) {
|
|
|
|
case SPNEGO_mechTypes:
|
|
|
|
offset = dissect_spnego_mechTypes(tvb, offset, pinfo,
|
|
subtree, hnd,
|
|
next_level_value_p);
|
|
|
|
break;
|
|
|
|
case SPNEGO_reqFlags:
|
|
|
|
offset = dissect_spnego_reqFlags(tvb, offset, pinfo, subtree, hnd);
|
|
|
|
break;
|
|
|
|
case SPNEGO_mechToken:
|
|
|
|
offset = dissect_spnego_mechToken(tvb, offset, pinfo, subtree,
|
|
hnd, gssapi_dissector_handle(*next_level_value_p));
|
|
break;
|
|
|
|
case SPNEGO_mechListMIC:
|
|
|
|
offset = dissect_spnego_mechListMIC(tvb, offset, pinfo, subtree,
|
|
hnd, gssapi_dissector_handle(*next_level_value_p));
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
}
|
|
|
|
len1 -= len;
|
|
|
|
}
|
|
|
|
done:
|
|
|
|
return offset; /* Not sure this is right */
|
|
}
|
|
|
|
static int
|
|
dissect_spnego_negResult(tvbuff_t *tvb, int offset, packet_info *pinfo _U_,
|
|
proto_tree *tree, ASN1_SCK *hnd)
|
|
{
|
|
gboolean def;
|
|
int ret;
|
|
guint len, cls, con, tag, val;
|
|
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &len);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, tree,
|
|
"SPNEGO context header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_ENUM)) {
|
|
proto_tree_add_text(
|
|
tree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d) xxx",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
offset = hnd->offset;
|
|
|
|
/* Now, get the value */
|
|
|
|
ret = asn1_uint32_value_decode(hnd, len, &val);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, tree,
|
|
"SPNEGO negResult value", ret);
|
|
goto done;
|
|
}
|
|
|
|
proto_tree_add_item(tree, hf_spnego_negtokentarg_negresult, tvb,
|
|
offset, 1, FALSE);
|
|
|
|
offset = hnd->offset;
|
|
|
|
done:
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_spnego_supportedMech(tvbuff_t *tvb, int offset, packet_info *pinfo _U_,
|
|
proto_tree *tree, ASN1_SCK *hnd,
|
|
gssapi_oid_value **next_level_value_p)
|
|
{
|
|
int ret;
|
|
guint oid_len, nbytes;
|
|
subid_t *oid;
|
|
gchar *oid_string;
|
|
gssapi_oid_value *value;
|
|
conversation_t *conversation;
|
|
|
|
/*
|
|
* Now, get the OID, and find the handle, if any
|
|
*/
|
|
|
|
offset = hnd->offset;
|
|
|
|
ret = asn1_oid_decode(hnd, &oid, &oid_len, &nbytes);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, tree,
|
|
"SPNEGO supportedMech token", ret);
|
|
goto done;
|
|
}
|
|
|
|
oid_string = format_oid(oid, oid_len);
|
|
value = gssapi_lookup_oid(oid, oid_len);
|
|
|
|
if (value)
|
|
proto_tree_add_text(tree, tvb, offset, nbytes,
|
|
"supportedMech: %s (%s)",
|
|
oid_string, value->comment);
|
|
else
|
|
proto_tree_add_text(tree, tvb, offset, nbytes, "supportedMech: %s",
|
|
oid_string);
|
|
|
|
g_free(oid_string);
|
|
|
|
offset += nbytes;
|
|
|
|
/* Should check for an unrecognized OID ... */
|
|
|
|
if (value)
|
|
*next_level_value_p = value;
|
|
|
|
/*
|
|
* Now, we need to save this in per proto info in the
|
|
* conversation if it exists. We also should create a
|
|
* conversation if one does not exist. FIXME!
|
|
* Hmmm, might need to be smarter, because there can be
|
|
* multiple mechTypes in a negTokenInit with one being the
|
|
* default used in the Token if present. Then the negTokenTarg
|
|
* could override that. :-(
|
|
*/
|
|
|
|
if ((conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
|
|
pinfo->ptype, pinfo->srcport,
|
|
pinfo->destport, 0))) {
|
|
|
|
|
|
conversation_add_proto_data(conversation, proto_spnego,
|
|
*next_level_value_p);
|
|
}
|
|
else {
|
|
|
|
}
|
|
|
|
done:
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_spnego_responseToken(tvbuff_t *tvb, int offset, packet_info *pinfo _U_,
|
|
proto_tree *tree, ASN1_SCK *hnd,
|
|
dissector_handle_t next_level_dissector)
|
|
{
|
|
gboolean def;
|
|
int ret;
|
|
guint cls, con, tag, nbytes;
|
|
tvbuff_t *token_tvb;
|
|
proto_item *item;
|
|
proto_tree *subtree;
|
|
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &nbytes);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, tree,
|
|
"SPNEGO sequence header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_UNI && con == ASN1_PRI && tag == ASN1_OTS)) {
|
|
proto_tree_add_text(
|
|
tree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
offset = hnd->offset;
|
|
|
|
item = proto_tree_add_item(tree, hf_spnego_responsetoken, tvb, offset -2 ,
|
|
nbytes + 2, FALSE);
|
|
|
|
subtree = proto_item_add_subtree(item, ett_spnego_responsetoken);
|
|
|
|
|
|
/*
|
|
* Now, we should be able to dispatch after creating a new TVB.
|
|
* However, we should make sure that there is something in the
|
|
* response token ...
|
|
*/
|
|
|
|
if (nbytes) {
|
|
token_tvb = tvb_new_subset(tvb, offset, nbytes, -1);
|
|
if (next_level_dissector)
|
|
call_dissector(next_level_dissector, token_tvb, pinfo, subtree);
|
|
}
|
|
else {
|
|
proto_tree_add_text(subtree, tvb, offset-2, 2, "<Empty String>");
|
|
}
|
|
hnd->offset += nbytes; /* Update this ... */
|
|
|
|
done:
|
|
return offset + nbytes;
|
|
}
|
|
|
|
static int
|
|
dissect_spnego_negTokenTarg(tvbuff_t *tvb, int offset, packet_info *pinfo _U_,
|
|
proto_tree *tree, ASN1_SCK *hnd,
|
|
gssapi_oid_value **next_level_value_p)
|
|
|
|
{
|
|
proto_item *item;
|
|
proto_tree *subtree;
|
|
gboolean def;
|
|
int ret;
|
|
guint len1, len, cls, con, tag;
|
|
|
|
item = proto_tree_add_item( tree, hf_spnego_negtokentarg, tvb, offset,
|
|
-1, FALSE);
|
|
subtree = proto_item_add_subtree(item, ett_spnego_negtokentarg);
|
|
|
|
/*
|
|
* Here is what we need to get ...
|
|
* NegTokenTarg ::= SEQUENCE {
|
|
* negResult [0] ENUMERATED {
|
|
* accept_completed (0),
|
|
* accept_incomplete (1),
|
|
* reject (2) } OPTIONAL,
|
|
* supportedMech [1] MechType OPTIONAL,
|
|
* responseToken [2] OCTET STRING OPTIONAL,
|
|
* mechListMIC [3] OCTET STRING OPTIONAL }
|
|
*/
|
|
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &len1);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, subtree,
|
|
"SPNEGO sequence header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_UNI && con == ASN1_CON && tag == ASN1_SEQ)) {
|
|
proto_tree_add_text(
|
|
subtree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
offset = hnd->offset;
|
|
|
|
while (len1) {
|
|
int hdr_ofs;
|
|
|
|
hdr_ofs = hnd->offset;
|
|
|
|
ret = asn1_header_decode(hnd, &cls, &con, &tag, &def, &len);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, subtree,
|
|
"SPNEGO context header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_CTX && con == ASN1_CON)) {
|
|
proto_tree_add_text(
|
|
subtree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
/* Adjust for the length of the header */
|
|
|
|
len1 -= (hnd->offset - hdr_ofs);
|
|
|
|
/* Should be one of the fields */
|
|
|
|
switch (tag) {
|
|
|
|
case SPNEGO_negResult:
|
|
|
|
offset = dissect_spnego_negResult(tvb, offset, pinfo, subtree,
|
|
hnd);
|
|
break;
|
|
|
|
case SPNEGO_supportedMech:
|
|
|
|
offset = dissect_spnego_supportedMech(tvb, offset, pinfo, subtree,
|
|
hnd, next_level_value_p);
|
|
|
|
break;
|
|
|
|
case SPNEGO_responseToken:
|
|
|
|
offset = dissect_spnego_responseToken(tvb, offset, pinfo, subtree,
|
|
hnd, gssapi_dissector_handle(*next_level_value_p));
|
|
break;
|
|
|
|
case SPNEGO_mechListMIC:
|
|
|
|
offset = dissect_spnego_mechListMIC(tvb, offset, pinfo, subtree,
|
|
hnd, gssapi_dissector_handle(*next_level_value_p));
|
|
break;
|
|
|
|
default:
|
|
|
|
break;
|
|
}
|
|
|
|
len1 -= len;
|
|
|
|
}
|
|
|
|
done:
|
|
return offset;
|
|
|
|
}
|
|
|
|
static void
|
|
dissect_spnego(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *item;
|
|
proto_tree *subtree;
|
|
int ret, offset = 0;
|
|
ASN1_SCK hnd;
|
|
gboolean def;
|
|
guint len1, cls, con, tag;
|
|
conversation_t *conversation;
|
|
gssapi_oid_value *next_level_value;
|
|
|
|
/*
|
|
* We need this later, so lets get it now ...
|
|
* It has to be per-frame as there can be more than one GSS-API
|
|
* negotiation in a conversation.
|
|
*/
|
|
|
|
next_level_value = p_get_proto_data(pinfo->fd, proto_spnego);
|
|
if (!next_level_value && !pinfo->fd->flags.visited) {
|
|
/*
|
|
* No handle attached to this frame, but it's the first
|
|
* pass, so it'd be attached to the conversation.
|
|
* If we have a conversation, try to get the handle,
|
|
* and if we get one, attach it to the frame.
|
|
*/
|
|
conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
|
|
pinfo->ptype, pinfo->srcport,
|
|
pinfo->destport, 0);
|
|
|
|
if (conversation) {
|
|
next_level_value = conversation_get_proto_data(conversation,
|
|
proto_spnego);
|
|
if (next_level_value)
|
|
p_add_proto_data(pinfo->fd, proto_spnego, next_level_value);
|
|
}
|
|
}
|
|
|
|
item = proto_tree_add_item(tree, hf_spnego, tvb, offset,
|
|
-1, FALSE);
|
|
|
|
subtree = proto_item_add_subtree(item, ett_spnego);
|
|
|
|
/*
|
|
* The TVB contains a [0] header and a sequence that consists of an
|
|
* object ID and a blob containing the data ...
|
|
* Actually, it contains, according to RFC2478:
|
|
* NegotiationToken ::= CHOICE {
|
|
* negTokenInit [0] NegTokenInit,
|
|
* negTokenTarg [1] NegTokenTarg }
|
|
* NegTokenInit ::= SEQUENCE {
|
|
* mechTypes [0] MechTypeList OPTIONAL,
|
|
* reqFlags [1] ContextFlags OPTIONAL,
|
|
* mechToken [2] OCTET STRING OPTIONAL,
|
|
* mechListMIC [3] OCTET STRING OPTIONAL }
|
|
* NegTokenTarg ::= SEQUENCE {
|
|
* negResult [0] ENUMERATED {
|
|
* accept_completed (0),
|
|
* accept_incomplete (1),
|
|
* reject (2) } OPTIONAL,
|
|
* supportedMech [1] MechType OPTIONAL,
|
|
* responseToken [2] OCTET STRING OPTIONAL,
|
|
* mechListMIC [3] OCTET STRING OPTIONAL }
|
|
*
|
|
* Windows typically includes mechTypes and mechListMic ('NONE'
|
|
* in the case of NTLMSSP only).
|
|
* It seems to duplicate the responseToken into the mechListMic field
|
|
* as well. Naughty, naughty.
|
|
*
|
|
*/
|
|
|
|
asn1_open(&hnd, tvb, offset);
|
|
|
|
/*
|
|
* Get the first header ...
|
|
*/
|
|
|
|
ret = asn1_header_decode(&hnd, &cls, &con, &tag, &def, &len1);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, subtree,
|
|
"SPNEGO context header", ret);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_CTX && con == ASN1_CON)) {
|
|
proto_tree_add_text(
|
|
subtree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
goto done;
|
|
}
|
|
|
|
offset = hnd.offset;
|
|
|
|
/*
|
|
* The Tag is one of negTokenInit or negTokenTarg
|
|
*/
|
|
|
|
switch (tag) {
|
|
|
|
case SPNEGO_negTokenInit:
|
|
|
|
offset = dissect_spnego_negTokenInit(tvb, offset, pinfo,
|
|
subtree, &hnd,
|
|
&next_level_value);
|
|
|
|
break;
|
|
|
|
case SPNEGO_negTokenTarg:
|
|
|
|
offset = dissect_spnego_negTokenTarg(tvb, offset, pinfo,
|
|
subtree, &hnd,
|
|
&next_level_value);
|
|
break;
|
|
|
|
default: /* Broken, what to do? */
|
|
|
|
break;
|
|
}
|
|
|
|
|
|
done:
|
|
asn1_close(&hnd, &offset);
|
|
|
|
}
|
|
|
|
static int
|
|
dissect_spnego_wrap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *item;
|
|
proto_tree *subtree;
|
|
int ret, offset = 0;
|
|
int return_offset;
|
|
ASN1_SCK hnd;
|
|
gboolean def;
|
|
guint len1, cls, con, tag, nbytes;
|
|
guint oid_len;
|
|
subid_t *oid;
|
|
gchar *oid_string;
|
|
conversation_t *conversation;
|
|
gssapi_oid_value *next_level_value;
|
|
tvbuff_t *token_tvb;
|
|
int len;
|
|
|
|
/*
|
|
* We need this later, so lets get it now ...
|
|
* It has to be per-frame as there can be more than one GSS-API
|
|
* negotiation in a conversation.
|
|
*/
|
|
|
|
next_level_value = p_get_proto_data(pinfo->fd, proto_spnego);
|
|
if (!next_level_value && !pinfo->fd->flags.visited) {
|
|
/*
|
|
* No handle attached to this frame, but it's the first
|
|
* pass, so it'd be attached to the conversation.
|
|
* If we have a conversation, try to get the handle,
|
|
* and if we get one, attach it to the frame.
|
|
*/
|
|
conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
|
|
pinfo->ptype, pinfo->srcport,
|
|
pinfo->destport, 0);
|
|
|
|
if (conversation) {
|
|
next_level_value = conversation_get_proto_data(conversation,
|
|
proto_spnego);
|
|
if (next_level_value)
|
|
p_add_proto_data(pinfo->fd, proto_spnego, next_level_value);
|
|
}
|
|
}
|
|
|
|
item = proto_tree_add_item(tree, hf_spnego, tvb, offset,
|
|
-1, FALSE);
|
|
|
|
subtree = proto_item_add_subtree(item, ett_spnego);
|
|
|
|
/*
|
|
* The TVB contains a [0] header and a sequence that consists of an
|
|
* object ID and a blob containing the data ...
|
|
* XXX - is this RFC 2743's "Mechanism-Independent Token Format",
|
|
* with the "optional" "use in non-initial tokens" being chosen.
|
|
*/
|
|
|
|
asn1_open(&hnd, tvb, offset);
|
|
|
|
/*
|
|
* Get the first header ...
|
|
*/
|
|
|
|
ret = asn1_header_decode(&hnd, &cls, &con, &tag, &def, &len1);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, subtree,
|
|
"SPNEGO context header", ret);
|
|
return_offset = tvb_length(tvb);
|
|
goto done;
|
|
}
|
|
|
|
if (!(cls == ASN1_APL && con == ASN1_CON && tag == 0)) {
|
|
proto_tree_add_text(
|
|
subtree, tvb, offset, 0,
|
|
"Unknown header (cls=%d, con=%d, tag=%d)",
|
|
cls, con, tag);
|
|
return_offset = tvb_length(tvb);
|
|
goto done;
|
|
}
|
|
|
|
offset = hnd.offset;
|
|
|
|
/*
|
|
* Get the OID, and find the handle, if any
|
|
*/
|
|
|
|
ret = asn1_oid_decode(&hnd, &oid, &oid_len, &nbytes);
|
|
|
|
if (ret != ASN1_ERR_NOERROR) {
|
|
dissect_parse_error(tvb, offset, pinfo, tree,
|
|
"SPNEGO wrap token", ret);
|
|
return_offset = tvb_length(tvb);
|
|
goto done;
|
|
}
|
|
|
|
oid_string = format_oid(oid, oid_len);
|
|
next_level_value = gssapi_lookup_oid(oid, oid_len);
|
|
|
|
/*
|
|
* XXX - what should we do if this doesn't match the value
|
|
* attached to the frame or conversation? (That would be
|
|
* bogus, but that's not impossible - some broken implementation
|
|
* might negotiate some security mechanism but put the OID
|
|
* for some other security mechanism in GSS_Wrap tokens.)
|
|
*/
|
|
if (next_level_value)
|
|
proto_tree_add_text(tree, tvb, offset, nbytes,
|
|
"thisMech: %s (%s)",
|
|
oid_string, next_level_value->comment);
|
|
else
|
|
proto_tree_add_text(tree, tvb, offset, nbytes, "thisMech: %s",
|
|
oid_string);
|
|
|
|
g_free(oid_string);
|
|
|
|
offset += nbytes;
|
|
|
|
/*
|
|
* Now dissect the GSS_Wrap token; it's assumed to be in the
|
|
* rest of the tvbuff.
|
|
*/
|
|
item = proto_tree_add_item(tree, hf_spnego_wraptoken, tvb, offset,
|
|
-1, FALSE);
|
|
|
|
subtree = proto_item_add_subtree(item, ett_spnego_wraptoken);
|
|
|
|
/*
|
|
* Now, we should be able to dispatch after creating a new TVB.
|
|
* The subdissector must return the length of the part of the
|
|
* token it dissected, so we can return the length of the part
|
|
* we (and it) dissected.
|
|
*/
|
|
|
|
token_tvb = tvb_new_subset(tvb, offset, -1, -1);
|
|
if (next_level_value->wrap_handle) {
|
|
len = call_dissector(next_level_value->wrap_handle, token_tvb, pinfo, subtree);
|
|
if (len == 0)
|
|
return_offset = tvb_length(tvb);
|
|
else
|
|
return_offset = offset + len;
|
|
} else
|
|
return_offset = tvb_length(tvb);
|
|
done:
|
|
asn1_close(&hnd, &offset);
|
|
|
|
return return_offset;
|
|
}
|
|
|
|
void
|
|
proto_register_spnego(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_spnego,
|
|
{ "SPNEGO", "spnego", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"SPNEGO", HFILL }},
|
|
{ &hf_spnego_negtokeninit,
|
|
{ "negTokenInit", "spnego.negtokeninit", FT_NONE, BASE_NONE,
|
|
NULL, 0x0, "SPNEGO negTokenInit", HFILL}},
|
|
{ &hf_spnego_negtokentarg,
|
|
{ "negTokenTarg", "spnego.negtokentarg", FT_NONE, BASE_NONE,
|
|
NULL, 0x0, "SPNEGO negTokenTarg", HFILL}},
|
|
{ &hf_spnego_mechtype,
|
|
{ "mechType", "spnego.negtokeninit.mechtype", FT_NONE,
|
|
BASE_NONE, NULL, 0x0, "SPNEGO negTokenInit mechTypes", HFILL}},
|
|
{ &hf_spnego_mechtoken,
|
|
{ "mechToken", "spnego.negtokeninit.mechtoken", FT_NONE,
|
|
BASE_NONE, NULL, 0x0, "SPNEGO negTokenInit mechToken", HFILL}},
|
|
{ &hf_spnego_mechlistmic,
|
|
{ "mechListMIC", "spnego.mechlistmic", FT_NONE,
|
|
BASE_NONE, NULL, 0x0, "SPNEGO mechListMIC", HFILL}},
|
|
{ &hf_spnego_responsetoken,
|
|
{ "responseToken", "spnego.negtokentarg.responsetoken",
|
|
FT_NONE, BASE_NONE, NULL, 0x0, "SPNEGO responseToken",
|
|
HFILL}},
|
|
{ &hf_spnego_negtokentarg_negresult,
|
|
{ "negResult", "spnego.negtokeninit.negresult", FT_UINT16,
|
|
BASE_HEX, VALS(spnego_negResult_vals), 0, "negResult", HFILL}},
|
|
{ &hf_spnego_reqflags,
|
|
{ "reqFlags", "spnego.negtokeninit.reqflags", FT_BYTES,
|
|
BASE_HEX, NULL, 0, "reqFlags", HFILL }},
|
|
{ &hf_gssapi_reqflags_deleg,
|
|
{ "Delegation", "gssapi.reqflags.deleg", FT_BOOLEAN, 8,
|
|
TFS(&tfs_reqflags_deleg), 0x01, "Delegation", HFILL }},
|
|
{ &hf_gssapi_reqflags_mutual,
|
|
{ "Mutual Authentication", "gssapi.reqflags.mutual", FT_BOOLEAN,
|
|
8, TFS(&tfs_reqflags_mutual), 0x02, "Mutual Authentication", HFILL}},
|
|
{ &hf_gssapi_reqflags_replay,
|
|
{ "Replay Detection", "gssapi.reqflags.replay", FT_BOOLEAN,
|
|
8, TFS(&tfs_reqflags_replay), 0x04, "Replay Detection", HFILL}},
|
|
{ &hf_gssapi_reqflags_sequence,
|
|
{ "Out-of-sequence Detection", "gssapi.reqflags.sequence",
|
|
FT_BOOLEAN, 8, TFS(&tfs_reqflags_sequence), 0x08,
|
|
"Out-of-sequence Detection", HFILL}},
|
|
{ &hf_gssapi_reqflags_anon,
|
|
{ "Anonymous Authentication", "gssapi.reqflags.anon",
|
|
FT_BOOLEAN, 8, TFS(&tfs_reqflags_anon), 0x10,
|
|
"Anonymous Authentication", HFILL}},
|
|
{ &hf_gssapi_reqflags_conf,
|
|
{ "Per-message Confidentiality", "gssapi.reqflags.conf",
|
|
FT_BOOLEAN, 8, TFS(&tfs_reqflags_conf), 0x20,
|
|
"Per-message Confidentiality", HFILL}},
|
|
{ &hf_gssapi_reqflags_integ,
|
|
{ "Per-message Integrity", "gssapi.reqflags.integ",
|
|
FT_BOOLEAN, 8, TFS(&tfs_reqflags_integ), 0x40,
|
|
"Per-message Integrity", HFILL}},
|
|
{ &hf_spnego_wraptoken,
|
|
{ "wrapToken", "spnego.wraptoken",
|
|
FT_NONE, BASE_NONE, NULL, 0x0, "SPNEGO wrapToken",
|
|
HFILL}},
|
|
{ &hf_spnego_krb5,
|
|
{ "krb5_blob", "spnego.krb5.blob", FT_BYTES,
|
|
BASE_NONE, NULL, 0, "krb5_blob", HFILL }},
|
|
{ &hf_spnego_krb5_tok_id,
|
|
{ "krb5_tok_id", "spnego.krb5.tok_id", FT_UINT16, BASE_HEX,
|
|
VALS(spnego_krb5_tok_id_vals), 0, "KRB5 Token Id", HFILL}},
|
|
{ &hf_spnego_krb5_sgn_alg,
|
|
{ "krb5_sgn_alg", "spnego.krb5.sgn_alg", FT_UINT16, BASE_HEX,
|
|
VALS(spnego_krb5_sgn_alg_vals), 0, "KRB5 Signing Algorithm", HFILL}},
|
|
{ &hf_spnego_krb5_seal_alg,
|
|
{ "krb5_seal_alg", "spnego.krb5.seal_alg", FT_UINT16, BASE_HEX,
|
|
VALS(spnego_krb5_seal_alg_vals), 0, "KRB5 Sealing Algorithm", HFILL}},
|
|
{ &hf_spnego_krb5_snd_seq,
|
|
{ "krb5_snd_seq", "spnego.krb5.snd_seq", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "KRB5 Encrypted Sequence Number", HFILL}},
|
|
{ &hf_spnego_krb5_sgn_cksum,
|
|
{ "krb5_sgn_cksum", "spnego.krb5.sgn_cksum", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "KRB5 Data Checksum", HFILL}},
|
|
{ &hf_spnego_krb5_confounder,
|
|
{ "krb5_confounder", "spnego.krb5.confounder", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "KRB5 Confounder", HFILL}},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_spnego,
|
|
&ett_spnego_negtokeninit,
|
|
&ett_spnego_negtokentarg,
|
|
&ett_spnego_mechtype,
|
|
&ett_spnego_mechtoken,
|
|
&ett_spnego_mechlistmic,
|
|
&ett_spnego_responsetoken,
|
|
&ett_spnego_wraptoken,
|
|
&ett_spnego_krb5,
|
|
};
|
|
|
|
proto_spnego = proto_register_protocol(
|
|
"Spnego", "Spnego", "spnego");
|
|
proto_spnego_krb5 = proto_register_protocol("SPNEGO-KRB5",
|
|
"SPNEGO-KRB5",
|
|
"spnego-krb5");
|
|
|
|
proto_register_field_array(proto_spnego, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_spnego(void)
|
|
{
|
|
dissector_handle_t spnego_handle, spnego_wrap_handle;
|
|
dissector_handle_t spnego_krb5_handle, spnego_krb5_wrap_handle;
|
|
|
|
/* Register protocol with GSS-API module */
|
|
|
|
spnego_handle = create_dissector_handle(dissect_spnego, proto_spnego);
|
|
spnego_wrap_handle = new_create_dissector_handle(dissect_spnego_wrap,
|
|
proto_spnego);
|
|
gssapi_init_oid("1.3.6.1.5.5.2", proto_spnego, ett_spnego,
|
|
spnego_handle, spnego_wrap_handle,
|
|
"SPNEGO - Simple Protected Negotiation");
|
|
|
|
/* Register both the one MS created and the real one */
|
|
/*
|
|
* Thanks to Jean-Baptiste Marchand and Richard B Ward, the
|
|
* mystery of the MS KRB5 OID is cleared up. It was due to a library
|
|
* that did not handle OID components greater than 16 bits, and was
|
|
* fixed in Win2K SP2 as well as WinXP.
|
|
* See the archive of <ietf-krb-wg@anl.gov> for the thread topic
|
|
* SPNEGO implementation issues. 3-Dec-2002.
|
|
*/
|
|
spnego_krb5_handle = create_dissector_handle(dissect_spnego_krb5,
|
|
proto_spnego_krb5);
|
|
spnego_krb5_wrap_handle = new_create_dissector_handle(dissect_spnego_krb5_wrap,
|
|
proto_spnego_krb5);
|
|
gssapi_init_oid("1.2.840.48018.1.2.2", proto_spnego_krb5, ett_spnego_krb5,
|
|
spnego_krb5_handle, spnego_krb5_wrap_handle,
|
|
"MS KRB5 - Microsoft Kerberos 5");
|
|
gssapi_init_oid("1.2.840.113554.1.2.2", proto_spnego_krb5, ett_spnego_krb5,
|
|
spnego_krb5_handle, spnego_krb5_wrap_handle,
|
|
"KRB5 - Kerberos 5");
|
|
gssapi_init_oid("1.2.840.113554.1.2.2.3", proto_spnego_krb5, ett_spnego_krb5,
|
|
spnego_krb5_handle, spnego_krb5_wrap_handle,
|
|
"KRB5 - Kerberos 5 - User to User");
|
|
|
|
/*
|
|
* Find the data handle for some calls
|
|
*/
|
|
data_handle = find_dissector("data");
|
|
}
|