2689 lines
87 KiB
C
2689 lines
87 KiB
C
/* packet-snmp.c
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* Routines for SNMP (simple network management protocol)
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* Copyright (C) 1998 Didier Jorand
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*
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* See RFC 1157 for SNMPv1.
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*
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* See RFCs 1901, 1905, and 1906 for SNMPv2c.
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*
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* See RFCs 1905, 1906, 1909, and 1910 for SNMPv2u [historic].
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*
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* See RFCs 2570-2576 for SNMPv3
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* Updated to use the asn2wrs compiler made by Tomas Kukosa
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* Copyright (C) 2005 - 2006 Anders Broman [AT] ericsson.com
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*
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* See RFC 3414 for User-based Security Model for SNMPv3
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* See RFC 3826 for (AES) Cipher Algorithm in the SNMP USM
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* See RFC 2578 for Structure of Management Information Version 2 (SMIv2)
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* Copyright (C) 2007 Luis E. Garcia Ontanon <luis@ontanon.org>
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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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* Some stuff from:
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*
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* GXSNMP -- An snmp mangament application
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* Copyright (C) 1998 Gregory McLean & Jochen Friedrich
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* Beholder RMON ethernet network monitor,Copyright (C) 1993 DNPAP group
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#if 0
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#include <stdio.h>
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#define D(args) do {printf args; fflush(stdout); } while(0)
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#endif
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include <epan/conversation.h>
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#include <epan/etypes.h>
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#include <epan/prefs.h>
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#include <epan/addr_resolv.h>
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#include <epan/next_tvb.h>
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#include <epan/uat.h>
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#include <epan/asn1.h>
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#include <epan/expert.h>
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#include <epan/oids.h>
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#include <epan/srt_table.h>
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#include <epan/tap.h>
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#include "packet-ipx.h"
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#include "packet-hpext.h"
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#include "packet-ber.h"
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#include "packet-snmp.h"
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#include <wsutil/wsgcrypt.h>
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#define PNAME "Simple Network Management Protocol"
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#define PSNAME "SNMP"
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#define PFNAME "snmp"
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#define UDP_PORT_SNMP 161
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#define UDP_PORT_SNMP_TRAP 162
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#define TCP_PORT_SNMP 161
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#define TCP_PORT_SNMP_TRAP 162
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#define TCP_PORT_SMUX 199
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#define UDP_PORT_SNMP_PATROL 8161
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#define SNMP_NUM_PROCEDURES 8
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/* Initialize the protocol and registered fields */
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static int snmp_tap = -1;
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static int proto_snmp = -1;
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static int proto_smux = -1;
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static gboolean display_oid = TRUE;
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static gboolean snmp_var_in_tree = TRUE;
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void proto_register_snmp(void);
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void proto_reg_handoff_snmp(void);
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void proto_register_smux(void);
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void proto_reg_handoff_smux(void);
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static void snmp_usm_password_to_key(const snmp_usm_auth_model_t model, const guint8 *password, guint passwordlen,
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const guint8 *engineID, guint engineLength, guint8 *key);
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static tvbuff_t* snmp_usm_priv_des(snmp_usm_params_t*, tvbuff_t*, packet_info *pinfo, gchar const**);
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static tvbuff_t* snmp_usm_priv_aes128(snmp_usm_params_t*, tvbuff_t*, packet_info *pinfo, gchar const**);
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static tvbuff_t* snmp_usm_priv_aes192(snmp_usm_params_t*, tvbuff_t*, packet_info *pinfo, gchar const**);
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static tvbuff_t* snmp_usm_priv_aes256(snmp_usm_params_t*, tvbuff_t*, packet_info *pinfo, gchar const**);
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static gboolean snmp_usm_auth(const packet_info *pinfo, const snmp_usm_auth_model_t model, snmp_usm_params_t* p, guint8**, guint*, gchar const**);
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static const value_string auth_types[] = {
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{SNMP_USM_AUTH_MD5,"MD5"},
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{SNMP_USM_AUTH_SHA1,"SHA1"},
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{SNMP_USM_AUTH_SHA2_224,"SHA2-224"},
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{SNMP_USM_AUTH_SHA2_256,"SHA2-256"},
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{SNMP_USM_AUTH_SHA2_384,"SHA2-384"},
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{SNMP_USM_AUTH_SHA2_512,"SHA2-512"},
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{0,NULL}
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};
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static const guint auth_hash_len[] = {
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HASH_MD5_LENGTH,
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HASH_SHA1_LENGTH,
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HASH_SHA2_224_LENGTH,
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HASH_SHA2_256_LENGTH,
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HASH_SHA2_384_LENGTH,
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HASH_SHA2_512_LENGTH
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};
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static const guint auth_tag_len[] = {
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12,
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12,
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16,
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24,
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32,
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48
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};
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static const enum gcry_md_algos auth_hash_algo[] = {
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GCRY_MD_MD5,
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GCRY_MD_SHA1,
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GCRY_MD_SHA224,
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GCRY_MD_SHA256,
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GCRY_MD_SHA384,
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GCRY_MD_SHA512
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};
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#define PRIV_DES 0
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#define PRIV_AES128 1
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#define PRIV_AES192 2
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#define PRIV_AES256 3
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static const value_string priv_types[] = {
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{ PRIV_DES, "DES" },
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{ PRIV_AES128, "AES" },
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{ PRIV_AES192, "AES192" },
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{ PRIV_AES256, "AES256" },
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{ 0, NULL}
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};
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static snmp_usm_decoder_t priv_protos[] = {
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snmp_usm_priv_des,
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snmp_usm_priv_aes128,
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snmp_usm_priv_aes192,
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snmp_usm_priv_aes256
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};
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static snmp_ue_assoc_t* ueas = NULL;
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static guint num_ueas = 0;
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static snmp_ue_assoc_t* localized_ues = NULL;
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static snmp_ue_assoc_t* unlocalized_ues = NULL;
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/****/
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/* Variables used for handling enterprise specific trap types */
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typedef struct _snmp_st_assoc_t {
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char *enterprise;
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guint trap;
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char *desc;
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} snmp_st_assoc_t;
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static guint num_specific_traps = 0;
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static snmp_st_assoc_t *specific_traps = NULL;
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static const char *enterprise_oid = NULL;
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static guint generic_trap = 0;
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static guint32 snmp_version = 0;
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static guint32 RequestID = -1;
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static snmp_usm_params_t usm_p = {FALSE,FALSE,0,0,0,0,NULL,NULL,NULL,NULL,NULL,NULL,NULL,FALSE};
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#define TH_AUTH 0x01
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#define TH_CRYPT 0x02
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#define TH_REPORT 0x04
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/* desegmentation of SNMP-over-TCP */
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static gboolean snmp_desegment = TRUE;
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/* Global variables */
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guint32 MsgSecurityModel;
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tvbuff_t *oid_tvb=NULL;
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tvbuff_t *value_tvb=NULL;
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static dissector_handle_t snmp_handle;
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static dissector_handle_t data_handle;
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static next_tvb_list_t *var_list;
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static int hf_snmp_response_in = -1;
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static int hf_snmp_response_to = -1;
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static int hf_snmp_time = -1;
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static int hf_snmp_v3_flags_auth = -1;
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static int hf_snmp_v3_flags_crypt = -1;
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static int hf_snmp_v3_flags_report = -1;
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static int hf_snmp_engineid_conform = -1;
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static int hf_snmp_engineid_enterprise = -1;
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static int hf_snmp_engineid_format = -1;
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static int hf_snmp_engineid_ipv4 = -1;
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static int hf_snmp_engineid_ipv6 = -1;
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static int hf_snmp_engineid_cisco_type = -1;
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static int hf_snmp_engineid_mac = -1;
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static int hf_snmp_engineid_text = -1;
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static int hf_snmp_engineid_time = -1;
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static int hf_snmp_engineid_data = -1;
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static int hf_snmp_decryptedPDU = -1;
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static int hf_snmp_msgAuthentication = -1;
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static int hf_snmp_noSuchObject = -1;
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static int hf_snmp_noSuchInstance = -1;
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static int hf_snmp_endOfMibView = -1;
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static int hf_snmp_unSpecified = -1;
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static int hf_snmp_integer32_value = -1;
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static int hf_snmp_octetstring_value = -1;
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static int hf_snmp_oid_value = -1;
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static int hf_snmp_null_value = -1;
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static int hf_snmp_ipv4_value = -1;
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static int hf_snmp_ipv6_value = -1;
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static int hf_snmp_anyaddress_value = -1;
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static int hf_snmp_unsigned32_value = -1;
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static int hf_snmp_unknown_value = -1;
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static int hf_snmp_opaque_value = -1;
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static int hf_snmp_nsap_value = -1;
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static int hf_snmp_counter_value = -1;
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static int hf_snmp_timeticks_value = -1;
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static int hf_snmp_big_counter_value = -1;
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static int hf_snmp_gauge32_value = -1;
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static int hf_snmp_objectname = -1;
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static int hf_snmp_scalar_instance_index = -1;
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static int hf_snmp_var_bind_str = -1;
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static int hf_snmp_agentid_trailer = -1;
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#include "packet-snmp-hf.c"
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/* Initialize the subtree pointers */
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static gint ett_smux = -1;
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static gint ett_snmp = -1;
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static gint ett_engineid = -1;
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static gint ett_msgFlags = -1;
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static gint ett_encryptedPDU = -1;
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static gint ett_decrypted = -1;
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static gint ett_authParameters = -1;
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static gint ett_internet = -1;
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static gint ett_varbind = -1;
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static gint ett_name = -1;
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static gint ett_value = -1;
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static gint ett_decoding_error = -1;
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#include "packet-snmp-ett.c"
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static expert_field ei_snmp_failed_decrypted_data_pdu = EI_INIT;
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static expert_field ei_snmp_decrypted_data_bad_formatted = EI_INIT;
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static expert_field ei_snmp_verify_authentication_error = EI_INIT;
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static expert_field ei_snmp_authentication_ok = EI_INIT;
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static expert_field ei_snmp_authentication_error = EI_INIT;
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static expert_field ei_snmp_varbind_not_uni_class_seq = EI_INIT;
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static expert_field ei_snmp_varbind_has_indicator = EI_INIT;
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static expert_field ei_snmp_objectname_not_oid = EI_INIT;
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static expert_field ei_snmp_objectname_has_indicator = EI_INIT;
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static expert_field ei_snmp_value_not_primitive_encoding = EI_INIT;
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static expert_field ei_snmp_invalid_oid = EI_INIT;
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static expert_field ei_snmp_varbind_wrong_tag = EI_INIT;
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static expert_field ei_snmp_varbind_response = EI_INIT;
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static expert_field ei_snmp_no_instance_subid = EI_INIT;
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static expert_field ei_snmp_wrong_num_of_subids = EI_INIT;
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static expert_field ei_snmp_index_suboid_too_short = EI_INIT;
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static expert_field ei_snmp_unimplemented_instance_index = EI_INIT;
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static expert_field ei_snmp_index_suboid_len0 = EI_INIT;
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static expert_field ei_snmp_index_suboid_too_long = EI_INIT;
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static expert_field ei_snmp_index_string_too_long = EI_INIT;
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static expert_field ei_snmp_column_parent_not_row = EI_INIT;
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static expert_field ei_snmp_uint_too_large = EI_INIT;
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static expert_field ei_snmp_int_too_large = EI_INIT;
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static expert_field ei_snmp_integral_value0 = EI_INIT;
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static expert_field ei_snmp_missing_mib = EI_INIT;
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static expert_field ei_snmp_varbind_wrong_length_value = EI_INIT;
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static expert_field ei_snmp_varbind_wrong_class_tag = EI_INIT;
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static expert_field ei_snmp_rfc1910_non_conformant = EI_INIT;
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static expert_field ei_snmp_rfc3411_non_conformant = EI_INIT;
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static expert_field ei_snmp_version_unknown = EI_INIT;
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static expert_field ei_snmp_trap_pdu_obsolete = EI_INIT;
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static const true_false_string auth_flags = {
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"OK",
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"Failed"
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};
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/* Security Models */
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#define SNMP_SEC_ANY 0
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#define SNMP_SEC_V1 1
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#define SNMP_SEC_V2C 2
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#define SNMP_SEC_USM 3
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static const value_string sec_models[] = {
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{ SNMP_SEC_ANY, "Any" },
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{ SNMP_SEC_V1, "V1" },
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{ SNMP_SEC_V2C, "V2C" },
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{ SNMP_SEC_USM, "USM" },
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{ 0, NULL }
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};
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#if 0
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/* SMUX PDU types */
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#define SMUX_MSG_OPEN 0
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#define SMUX_MSG_CLOSE 1
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#define SMUX_MSG_RREQ 2
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#define SMUX_MSG_RRSP 3
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#define SMUX_MSG_SOUT 4
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static const value_string smux_types[] = {
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{ SMUX_MSG_OPEN, "Open" },
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{ SMUX_MSG_CLOSE, "Close" },
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{ SMUX_MSG_RREQ, "Registration Request" },
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{ SMUX_MSG_RRSP, "Registration Response" },
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{ SMUX_MSG_SOUT, "Commit Or Rollback" },
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{ 0, NULL }
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};
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#endif
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/* Procedure names (used in Service Response Time) */
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const value_string snmp_procedure_names[] = {
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{ 0, "Get" },
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{ 1, "GetNext" },
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{ 3, "Set" },
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{ 4, "Register" },
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{ 5, "Bulk" },
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{ 6, "Inform" },
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{ 0, NULL }
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};
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#define SNMP_IPA 0 /* IP Address */
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#define SNMP_CNT 1 /* Counter (Counter32) */
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#define SNMP_GGE 2 /* Gauge (Gauge32) */
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#define SNMP_TIT 3 /* TimeTicks */
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#define SNMP_OPQ 4 /* Opaque */
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#define SNMP_NSP 5 /* NsapAddress */
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#define SNMP_C64 6 /* Counter64 */
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#define SNMP_U32 7 /* Uinteger32 */
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#define SERR_NSO 0
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#define SERR_NSI 1
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#define SERR_EOM 2
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dissector_table_t value_sub_dissectors_table;
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/*
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* Data structure attached to a conversation, request/response information
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*/
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typedef struct snmp_conv_info_t {
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wmem_map_t *request_response;
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} snmp_conv_info_t;
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static snmp_request_response_t *
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snmp_get_request_response_pointer(wmem_map_t *map, guint32 requestId)
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{
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snmp_request_response_t *srrp=(snmp_request_response_t *)wmem_map_lookup(map, &requestId);
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if (!srrp) {
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srrp=wmem_new0(wmem_file_scope(), snmp_request_response_t);
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srrp->requestId=requestId;
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wmem_map_insert(map, &(srrp->requestId), (void *)srrp);
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}
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return srrp;
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}
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static snmp_request_response_t*
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snmp_match_request_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint requestId, guint procedure_id, snmp_conv_info_t *snmp_info)
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{
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snmp_request_response_t *srrp=NULL;
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DISSECTOR_ASSERT_HINT(snmp_info, "No SNMP info from ASN1 context");
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/* get or create request/response pointer based on request id */
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srrp=(snmp_request_response_t *)snmp_get_request_response_pointer(snmp_info->request_response, requestId);
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// if not visited fill the request/response data
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if (!PINFO_FD_VISITED(pinfo)) {
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switch(procedure_id)
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{
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case SNMP_REQ_GET:
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case SNMP_REQ_GETNEXT:
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case SNMP_REQ_SET:
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case SNMP_REQ_GETBULK:
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case SNMP_REQ_INFORM:
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srrp->request_frame_id=pinfo->fd->num;
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srrp->response_frame_id=0;
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srrp->request_time=pinfo->abs_ts;
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srrp->request_procedure_id=procedure_id;
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break;
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case SNMP_RES_GET:
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srrp->response_frame_id=pinfo->fd->num;
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break;
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default:
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return NULL;
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}
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}
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/* if request and response was matched */
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if (srrp->request_frame_id!=0 && srrp->response_frame_id!=0)
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{
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proto_item *it;
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// if it is a request
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if (srrp->request_frame_id == pinfo->fd->num)
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{
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it=proto_tree_add_uint(tree, hf_snmp_response_in, tvb, 0, 0, srrp->response_frame_id);
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proto_item_set_generated(it);
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} else {
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nstime_t ns;
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it=proto_tree_add_uint(tree, hf_snmp_response_to, tvb, 0, 0, srrp->request_frame_id);
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proto_item_set_generated(it);
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nstime_delta(&ns, &pinfo->abs_ts, &srrp->request_time);
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it=proto_tree_add_time(tree, hf_snmp_time, tvb, 0, 0, &ns);
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proto_item_set_generated(it);
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return srrp;
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}
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}
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return NULL;
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}
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static void
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snmpstat_init(struct register_srt* srt _U_, GArray* srt_array)
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{
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srt_stat_table *snmp_srt_table;
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guint32 i;
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snmp_srt_table = init_srt_table("SNMP Commands", NULL, srt_array, SNMP_NUM_PROCEDURES, NULL, "snmp.data", NULL);
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for (i = 0; i < SNMP_NUM_PROCEDURES; i++)
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{
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init_srt_table_row(snmp_srt_table, i, val_to_str_const(i, snmp_procedure_names, "<unknown>"));
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}
|
|
}
|
|
|
|
/* This is called only if request and response was matched -> no need to return anything than TAP_PACKET_REDRAW */
|
|
static tap_packet_status
|
|
snmpstat_packet(void *psnmp, packet_info *pinfo, epan_dissect_t *edt _U_, const void *psi, tap_flags_t flags _U_)
|
|
{
|
|
guint i = 0;
|
|
srt_stat_table *snmp_srt_table;
|
|
const snmp_request_response_t *snmp=(const snmp_request_response_t *)psi;
|
|
srt_data_t *data = (srt_data_t *)psnmp;
|
|
|
|
snmp_srt_table = g_array_index(data->srt_array, srt_stat_table*, i);
|
|
|
|
add_srt_table_data(snmp_srt_table, snmp->request_procedure_id, &snmp->request_time, pinfo);
|
|
return TAP_PACKET_REDRAW;
|
|
}
|
|
|
|
static const gchar *
|
|
snmp_lookup_specific_trap (guint specific_trap)
|
|
{
|
|
guint i;
|
|
|
|
for (i = 0; i < num_specific_traps; i++) {
|
|
snmp_st_assoc_t *u = &(specific_traps[i]);
|
|
|
|
if ((u->trap == specific_trap) &&
|
|
(strcmp (u->enterprise, enterprise_oid) == 0))
|
|
{
|
|
return u->desc;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
dissect_snmp_variable_string(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, void *data _U_)
|
|
{
|
|
|
|
proto_tree_add_item(tree, hf_snmp_var_bind_str, tvb, 0, -1, ENC_ASCII);
|
|
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
/*
|
|
DateAndTime ::= TEXTUAL-CONVENTION
|
|
DISPLAY-HINT "2d-1d-1d,1d:1d:1d.1d,1a1d:1d"
|
|
STATUS current
|
|
DESCRIPTION
|
|
"A date-time specification.
|
|
|
|
field octets contents range
|
|
----- ------ -------- -----
|
|
1 1-2 year* 0..65536
|
|
2 3 month 1..12
|
|
3 4 day 1..31
|
|
4 5 hour 0..23
|
|
5 6 minutes 0..59
|
|
6 7 seconds 0..60
|
|
(use 60 for leap-second)
|
|
7 8 deci-seconds 0..9
|
|
8 9 direction from UTC '+' / '-'
|
|
9 10 hours from UTC* 0..13
|
|
10 11 minutes from UTC 0..59
|
|
|
|
* Notes:
|
|
- the value of year is in network-byte order
|
|
- daylight saving time in New Zealand is +13
|
|
|
|
For example, Tuesday May 26, 1992 at 1:30:15 PM EDT would be
|
|
displayed as:
|
|
|
|
1992-5-26,13:30:15.0,-4:0
|
|
|
|
Note that if only local time is known, then timezone
|
|
information (fields 8-10) is not present."
|
|
SYNTAX OCTET STRING (SIZE (8 | 11))
|
|
*/
|
|
static proto_item *
|
|
dissect_snmp_variable_date_and_time(proto_tree *tree, packet_info *pinfo, int hfid, tvbuff_t *tvb, int offset, int length)
|
|
{
|
|
guint16 year;
|
|
guint8 month;
|
|
guint8 day;
|
|
guint8 hour;
|
|
guint8 minutes;
|
|
guint8 seconds;
|
|
guint8 deci_seconds;
|
|
guint8 hour_from_utc;
|
|
guint8 min_from_utc;
|
|
gchar *str;
|
|
|
|
year = tvb_get_ntohs(tvb,offset);
|
|
month = tvb_get_guint8(tvb,offset+2);
|
|
day = tvb_get_guint8(tvb,offset+3);
|
|
hour = tvb_get_guint8(tvb,offset+4);
|
|
minutes = tvb_get_guint8(tvb,offset+5);
|
|
seconds = tvb_get_guint8(tvb,offset+6);
|
|
deci_seconds = tvb_get_guint8(tvb,offset+7);
|
|
if(length > 8){
|
|
hour_from_utc = tvb_get_guint8(tvb,offset+9);
|
|
min_from_utc = tvb_get_guint8(tvb,offset+10);
|
|
|
|
str = wmem_strdup_printf(pinfo->pool,
|
|
"%u-%u-%u, %u:%u:%u.%u UTC %s%u:%u",
|
|
year,
|
|
month,
|
|
day,
|
|
hour,
|
|
minutes,
|
|
seconds,
|
|
deci_seconds,
|
|
tvb_get_string_enc(pinfo->pool,tvb,offset+8,1,ENC_ASCII|ENC_NA),
|
|
hour_from_utc,
|
|
min_from_utc);
|
|
}else{
|
|
str = wmem_strdup_printf(pinfo->pool,
|
|
"%u-%u-%u, %u:%u:%u.%u",
|
|
year,
|
|
month,
|
|
day,
|
|
hour,
|
|
minutes,
|
|
seconds,
|
|
deci_seconds);
|
|
}
|
|
|
|
return proto_tree_add_string(tree, hfid, tvb, offset, length, str);
|
|
|
|
}
|
|
|
|
/*
|
|
* dissect_snmp_VarBind
|
|
* this routine dissects variable bindings, looking for the oid information in our oid reporsitory
|
|
* to format and add the value adequatelly.
|
|
*
|
|
* The choice to handwrite this code instead of using the asn compiler is to avoid having tons
|
|
* of uses of global variables distributed in very different parts of the code.
|
|
* Other than that there's a cosmetic thing: the tree from ASN generated code would be so
|
|
* convoluted due to the nesting of CHOICEs in the definition of VarBind/value.
|
|
*
|
|
* XXX: the length of this function (~400 lines) is an aberration!
|
|
* oid_key_t:key_type could become a series of callbacks instead of an enum
|
|
* the (! oid_info_is_ok) switch could be made into an array (would be slower)
|
|
*
|
|
|
|
NetworkAddress ::= CHOICE { internet IpAddress }
|
|
IpAddress ::= [APPLICATION 0] IMPLICIT OCTET STRING (SIZE (4))
|
|
TimeTicks ::= [APPLICATION 3] IMPLICIT INTEGER (0..4294967295)
|
|
Integer32 ::= INTEGER (-2147483648..2147483647)
|
|
ObjectName ::= OBJECT IDENTIFIER
|
|
Counter32 ::= [APPLICATION 1] IMPLICIT INTEGER (0..4294967295)
|
|
Gauge32 ::= [APPLICATION 2] IMPLICIT INTEGER (0..4294967295)
|
|
Unsigned32 ::= [APPLICATION 2] IMPLICIT INTEGER (0..4294967295)
|
|
Integer-value ::= INTEGER (-2147483648..2147483647)
|
|
Integer32 ::= INTEGER (-2147483648..2147483647)
|
|
ObjectID-value ::= OBJECT IDENTIFIER
|
|
Empty ::= NULL
|
|
TimeTicks ::= [APPLICATION 3] IMPLICIT INTEGER (0..4294967295)
|
|
Opaque ::= [APPLICATION 4] IMPLICIT OCTET STRING
|
|
Counter64 ::= [APPLICATION 6] IMPLICIT INTEGER (0..18446744073709551615)
|
|
|
|
ObjectSyntax ::= CHOICE {
|
|
simple SimpleSyntax,
|
|
application-wide ApplicationSyntax
|
|
}
|
|
|
|
SimpleSyntax ::= CHOICE {
|
|
integer-value Integer-value,
|
|
string-value String-value,
|
|
objectID-value ObjectID-value,
|
|
empty Empty
|
|
}
|
|
|
|
ApplicationSyntax ::= CHOICE {
|
|
ipAddress-value IpAddress,
|
|
counter-value Counter32,
|
|
timeticks-value TimeTicks,
|
|
arbitrary-value Opaque,
|
|
big-counter-value Counter64,
|
|
unsigned-integer-value Unsigned32
|
|
}
|
|
|
|
ValueType ::= CHOICE {
|
|
value ObjectSyntax,
|
|
unSpecified NULL,
|
|
noSuchObject[0] IMPLICIT NULL,
|
|
noSuchInstance[1] IMPLICIT NULL,
|
|
endOfMibView[2] IMPLICIT NULL
|
|
}
|
|
|
|
VarBind ::= SEQUENCE {
|
|
name ObjectName,
|
|
valueType ValueType
|
|
}
|
|
|
|
*/
|
|
|
|
static int
|
|
dissect_snmp_VarBind(gboolean implicit_tag _U_, tvbuff_t *tvb, int offset,
|
|
asn1_ctx_t *actx, proto_tree *tree, int hf_index _U_)
|
|
{
|
|
int seq_offset, name_offset, value_offset, value_start;
|
|
guint32 seq_len, name_len, value_len;
|
|
gint8 ber_class;
|
|
gboolean pc;
|
|
gint32 tag;
|
|
gboolean ind;
|
|
guint32* subids;
|
|
guint8* oid_bytes;
|
|
oid_info_t* oid_info = NULL;
|
|
guint oid_matched, oid_left;
|
|
proto_item *pi_name, *pi_varbind, *pi_value = NULL;
|
|
proto_tree *pt, *pt_varbind, *pt_name, *pt_value;
|
|
char label[ITEM_LABEL_LENGTH];
|
|
const char* repr = NULL;
|
|
const char* info_oid = NULL;
|
|
char* valstr;
|
|
int hfid = -1;
|
|
int min_len = 0, max_len = 0;
|
|
gboolean oid_info_is_ok;
|
|
const char* oid_string = NULL;
|
|
enum {BER_NO_ERROR, BER_WRONG_LENGTH, BER_WRONG_TAG} format_error = BER_NO_ERROR;
|
|
|
|
seq_offset = offset;
|
|
|
|
/* first have the VarBind's sequence header */
|
|
offset = dissect_ber_identifier(actx->pinfo, tree, tvb, offset, &ber_class, &pc, &tag);
|
|
offset = dissect_ber_length(actx->pinfo, tree, tvb, offset, &seq_len, &ind);
|
|
|
|
if (!pc && ber_class==BER_CLASS_UNI && tag==BER_UNI_TAG_SEQUENCE) {
|
|
proto_item* pi;
|
|
pt = proto_tree_add_subtree(tree, tvb, seq_offset, seq_len + (offset - seq_offset),
|
|
ett_decoding_error, &pi, "VarBind must be an universal class sequence");
|
|
expert_add_info(actx->pinfo, pi, &ei_snmp_varbind_not_uni_class_seq);
|
|
return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
|
|
}
|
|
|
|
if (ind) {
|
|
proto_item* pi;
|
|
pt = proto_tree_add_subtree(tree, tvb, seq_offset, seq_len + (offset - seq_offset),
|
|
ett_decoding_error, &pi, "Indicator must be clear in VarBind");
|
|
expert_add_info(actx->pinfo, pi, &ei_snmp_varbind_has_indicator);
|
|
return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
|
|
}
|
|
|
|
/* we add the varbind tree root with a dummy label we'll fill later on */
|
|
pt_varbind = proto_tree_add_subtree(tree,tvb,offset,seq_len,ett_varbind,&pi_varbind,"VarBind");
|
|
*label = '\0';
|
|
|
|
seq_len += offset - seq_offset;
|
|
|
|
/* then we have the ObjectName's header */
|
|
|
|
offset = dissect_ber_identifier(actx->pinfo, pt_varbind, tvb, offset, &ber_class, &pc, &tag);
|
|
name_offset = offset = dissect_ber_length(actx->pinfo, pt_varbind, tvb, offset, &name_len, &ind);
|
|
|
|
if (! ( !pc && ber_class==BER_CLASS_UNI && tag==BER_UNI_TAG_OID) ) {
|
|
proto_item* pi;
|
|
pt = proto_tree_add_subtree(tree, tvb, seq_offset, seq_len,
|
|
ett_decoding_error, &pi, "ObjectName must be an OID in primitive encoding");
|
|
expert_add_info(actx->pinfo, pi, &ei_snmp_objectname_not_oid);
|
|
return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
|
|
}
|
|
|
|
if (ind) {
|
|
proto_item* pi;
|
|
pt = proto_tree_add_subtree(tree, tvb, seq_offset, seq_len,
|
|
ett_decoding_error, &pi, "Indicator must be clear in ObjectName");
|
|
expert_add_info(actx->pinfo, pi, &ei_snmp_objectname_has_indicator);
|
|
return dissect_unknown_ber(actx->pinfo, tvb, seq_offset, pt);
|
|
}
|
|
|
|
pi_name = proto_tree_add_item(pt_varbind,hf_snmp_objectname,tvb,name_offset,name_len,ENC_NA);
|
|
pt_name = proto_item_add_subtree(pi_name,ett_name);
|
|
|
|
offset += name_len;
|
|
value_start = offset;
|
|
/* then we have the value's header */
|
|
offset = dissect_ber_identifier(actx->pinfo, pt_varbind, tvb, offset, &ber_class, &pc, &tag);
|
|
value_offset = dissect_ber_length(actx->pinfo, pt_varbind, tvb, offset, &value_len, &ind);
|
|
|
|
if (! (!pc) ) {
|
|
proto_item* pi;
|
|
pt = proto_tree_add_subtree(pt_varbind, tvb, value_start, value_len,
|
|
ett_decoding_error, &pi, "the value must be in primitive encoding");
|
|
expert_add_info(actx->pinfo, pi, &ei_snmp_value_not_primitive_encoding);
|
|
return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
|
|
}
|
|
|
|
/* Now, we know where everithing is */
|
|
|
|
/* fetch ObjectName and its relative oid_info */
|
|
oid_bytes = (guint8*)tvb_memdup(actx->pinfo->pool, tvb, name_offset, name_len);
|
|
oid_info = oid_get_from_encoded(actx->pinfo->pool, oid_bytes, name_len, &subids, &oid_matched, &oid_left);
|
|
|
|
add_oid_debug_subtree(oid_info,pt_name);
|
|
|
|
if (!subids) {
|
|
proto_item* pi;
|
|
|
|
repr = oid_encoded2string(actx->pinfo->pool, oid_bytes, name_len);
|
|
pt = proto_tree_add_subtree_format(pt_name,tvb, 0, 0, ett_decoding_error, &pi, "invalid oid: %s", repr);
|
|
expert_add_info_format(actx->pinfo, pi, &ei_snmp_invalid_oid, "invalid oid: %s", repr);
|
|
return dissect_unknown_ber(actx->pinfo, tvb, name_offset, pt);
|
|
}
|
|
|
|
if (oid_matched+oid_left) {
|
|
oid_string = oid_subid2string(actx->pinfo->pool, subids,oid_matched+oid_left);
|
|
}
|
|
|
|
if (ber_class == BER_CLASS_CON) {
|
|
/* if we have an error value just add it and get out the way ASAP */
|
|
proto_item* pi;
|
|
const char* note;
|
|
|
|
if (value_len != 0) {
|
|
min_len = max_len = 0;
|
|
format_error = BER_WRONG_LENGTH;
|
|
}
|
|
|
|
switch (tag) {
|
|
case SERR_NSO:
|
|
hfid = hf_snmp_noSuchObject;
|
|
note = "noSuchObject";
|
|
break;
|
|
case SERR_NSI:
|
|
hfid = hf_snmp_noSuchInstance;
|
|
note = "noSuchInstance";
|
|
break;
|
|
case SERR_EOM:
|
|
hfid = hf_snmp_endOfMibView;
|
|
note = "endOfMibView";
|
|
break;
|
|
default: {
|
|
pt = proto_tree_add_subtree_format(pt_varbind,tvb,0,0,ett_decoding_error,&pi,
|
|
"Wrong tag for Error Value: expected 0, 1, or 2 but got: %d",tag);
|
|
expert_add_info(actx->pinfo, pi, &ei_snmp_varbind_wrong_tag);
|
|
return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
|
|
}
|
|
}
|
|
|
|
pi = proto_tree_add_item(pt_varbind,hfid,tvb,value_offset,value_len,ENC_BIG_ENDIAN);
|
|
expert_add_info_format(actx->pinfo, pi, &ei_snmp_varbind_response, "%s",note);
|
|
(void) g_strlcpy (label, note, ITEM_LABEL_LENGTH);
|
|
goto set_label;
|
|
}
|
|
|
|
/* now we'll try to figure out which are the indexing sub-oids and whether the oid we know about is the one oid we have to use */
|
|
switch (oid_info->kind) {
|
|
case OID_KIND_SCALAR:
|
|
if (oid_left == 1) {
|
|
/* OK: we got the instance sub-id */
|
|
proto_tree_add_uint64(pt_name,hf_snmp_scalar_instance_index,tvb,name_offset,name_len,subids[oid_matched]);
|
|
oid_info_is_ok = TRUE;
|
|
goto indexing_done;
|
|
} else if (oid_left == 0) {
|
|
if (ber_class == BER_CLASS_UNI && tag == BER_UNI_TAG_NULL) {
|
|
/* unSpecified does not require an instance sub-id add the new value and get off the way! */
|
|
pi_value = proto_tree_add_item(pt_varbind,hf_snmp_unSpecified,tvb,value_offset,value_len,ENC_NA);
|
|
goto set_label;
|
|
} else {
|
|
proto_tree_add_expert(pt_name,actx->pinfo,&ei_snmp_no_instance_subid,tvb,0,0);
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
} else {
|
|
proto_tree_add_expert_format(pt_name,actx->pinfo,&ei_snmp_wrong_num_of_subids,tvb,0,0,"A scalar should have only one instance sub-id this has: %d",oid_left);
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
break;
|
|
case OID_KIND_COLUMN:
|
|
if ( oid_info->parent->kind == OID_KIND_ROW) {
|
|
oid_key_t* k = oid_info->parent->key;
|
|
guint key_start = oid_matched;
|
|
guint key_len = oid_left;
|
|
oid_info_is_ok = TRUE;
|
|
|
|
if ( key_len == 0 && ber_class == BER_CLASS_UNI && tag == BER_UNI_TAG_NULL) {
|
|
/* unSpecified does not require an instance sub-id add the new value and get off the way! */
|
|
pi_value = proto_tree_add_item(pt_varbind,hf_snmp_unSpecified,tvb,value_offset,value_len,ENC_NA);
|
|
goto set_label;
|
|
}
|
|
|
|
if (k) {
|
|
for (;k;k = k->next) {
|
|
guint suboid_len;
|
|
|
|
if (key_start >= oid_matched+oid_left) {
|
|
proto_tree_add_expert(pt_name,actx->pinfo,&ei_snmp_index_suboid_too_short,tvb,0,0);
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
|
|
switch(k->key_type) {
|
|
case OID_KEY_TYPE_WRONG: {
|
|
proto_tree_add_expert(pt_name,actx->pinfo,&ei_snmp_unimplemented_instance_index,tvb,0,0);
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
case OID_KEY_TYPE_INTEGER: {
|
|
if (IS_FT_INT(k->ft_type)) {
|
|
proto_tree_add_int(pt_name,k->hfid,tvb,name_offset,name_len,(guint)subids[key_start]);
|
|
} else { /* if it's not an unsigned int let proto_tree_add_uint throw a warning */
|
|
proto_tree_add_uint64(pt_name,k->hfid,tvb,name_offset,name_len,(guint)subids[key_start]);
|
|
}
|
|
key_start++;
|
|
key_len--;
|
|
continue; /* k->next */
|
|
}
|
|
case OID_KEY_TYPE_IMPLIED_OID:
|
|
suboid_len = key_len;
|
|
|
|
goto show_oid_index;
|
|
|
|
case OID_KEY_TYPE_OID: {
|
|
guint8* suboid_buf;
|
|
guint suboid_buf_len;
|
|
guint32* suboid;
|
|
|
|
suboid_len = subids[key_start++];
|
|
key_len--;
|
|
|
|
show_oid_index:
|
|
suboid = &(subids[key_start]);
|
|
|
|
if( suboid_len == 0 ) {
|
|
proto_tree_add_expert(pt_name,actx->pinfo,&ei_snmp_index_suboid_len0,tvb,0,0);
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
|
|
if( key_len < suboid_len ) {
|
|
proto_tree_add_expert(pt_name,actx->pinfo,&ei_snmp_index_suboid_too_long,tvb,0,0);
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
|
|
suboid_buf_len = oid_subid2encoded(actx->pinfo->pool, suboid_len, suboid, &suboid_buf);
|
|
|
|
DISSECTOR_ASSERT(suboid_buf_len);
|
|
|
|
proto_tree_add_oid(pt_name,k->hfid,tvb,name_offset, suboid_buf_len, suboid_buf);
|
|
|
|
key_start += suboid_len;
|
|
key_len -= suboid_len + 1;
|
|
continue; /* k->next */
|
|
}
|
|
default: {
|
|
guint8* buf;
|
|
guint buf_len;
|
|
guint32* suboid;
|
|
guint i;
|
|
|
|
|
|
switch (k->key_type) {
|
|
case OID_KEY_TYPE_IPADDR:
|
|
suboid = &(subids[key_start]);
|
|
buf_len = 4;
|
|
break;
|
|
case OID_KEY_TYPE_IMPLIED_STRING:
|
|
case OID_KEY_TYPE_IMPLIED_BYTES:
|
|
case OID_KEY_TYPE_ETHER:
|
|
suboid = &(subids[key_start]);
|
|
buf_len = key_len;
|
|
break;
|
|
default:
|
|
buf_len = k->num_subids;
|
|
suboid = &(subids[key_start]);
|
|
|
|
if(!buf_len) {
|
|
buf_len = *suboid++;
|
|
key_len--;
|
|
key_start++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if( key_len < buf_len ) {
|
|
proto_tree_add_expert(pt_name,actx->pinfo,&ei_snmp_index_string_too_long,tvb,0,0);
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
|
|
buf = (guint8*)wmem_alloc(actx->pinfo->pool, buf_len+1);
|
|
for (i = 0; i < buf_len; i++)
|
|
buf[i] = (guint8)suboid[i];
|
|
buf[i] = '\0';
|
|
|
|
switch(k->key_type) {
|
|
case OID_KEY_TYPE_STRING:
|
|
case OID_KEY_TYPE_IMPLIED_STRING:
|
|
proto_tree_add_string(pt_name,k->hfid,tvb,name_offset,buf_len, buf);
|
|
break;
|
|
case OID_KEY_TYPE_BYTES:
|
|
case OID_KEY_TYPE_NSAP:
|
|
case OID_KEY_TYPE_IMPLIED_BYTES:
|
|
proto_tree_add_bytes(pt_name,k->hfid,tvb,name_offset,buf_len, buf);
|
|
break;
|
|
case OID_KEY_TYPE_ETHER:
|
|
proto_tree_add_ether(pt_name,k->hfid,tvb,name_offset,buf_len, buf);
|
|
break;
|
|
case OID_KEY_TYPE_IPADDR: {
|
|
guint32* ipv4_p = (guint32*)buf;
|
|
proto_tree_add_ipv4(pt_name,k->hfid,tvb,name_offset,buf_len, *ipv4_p);
|
|
}
|
|
break;
|
|
default:
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
break;
|
|
}
|
|
|
|
key_start += buf_len;
|
|
key_len -= buf_len;
|
|
continue; /* k->next*/
|
|
}
|
|
}
|
|
}
|
|
goto indexing_done;
|
|
} else {
|
|
proto_tree_add_expert(pt_name,actx->pinfo,&ei_snmp_unimplemented_instance_index,tvb,0,0);
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
} else {
|
|
proto_tree_add_expert(pt_name,actx->pinfo,&ei_snmp_column_parent_not_row,tvb,0,0);
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
default: {
|
|
/* proto_tree_add_expert (pt_name,actx->pinfo,PI_MALFORMED, PI_WARN,tvb,0,0,"This kind OID should have no value"); */
|
|
oid_info_is_ok = FALSE;
|
|
goto indexing_done;
|
|
}
|
|
}
|
|
indexing_done:
|
|
|
|
if (oid_info_is_ok && oid_info->value_type) {
|
|
if (ber_class == BER_CLASS_UNI && tag == BER_UNI_TAG_NULL) {
|
|
pi_value = proto_tree_add_item(pt_varbind,hf_snmp_unSpecified,tvb,value_offset,value_len,ENC_NA);
|
|
} else {
|
|
/* Provide a tree_item to attach errors to, if needed. */
|
|
pi_value = pi_name;
|
|
|
|
if ((oid_info->value_type->ber_class != BER_CLASS_ANY) &&
|
|
(ber_class != oid_info->value_type->ber_class))
|
|
format_error = BER_WRONG_TAG;
|
|
else if ((oid_info->value_type->ber_tag != BER_TAG_ANY) &&
|
|
(tag != oid_info->value_type->ber_tag))
|
|
format_error = BER_WRONG_TAG;
|
|
else {
|
|
max_len = oid_info->value_type->max_len == -1 ? 0xffffff : oid_info->value_type->max_len;
|
|
min_len = oid_info->value_type->min_len;
|
|
|
|
if ((int)value_len < min_len || (int)value_len > max_len)
|
|
format_error = BER_WRONG_LENGTH;
|
|
}
|
|
|
|
if (format_error == BER_NO_ERROR)
|
|
pi_value = proto_tree_add_item(pt_varbind,oid_info->value_hfid,tvb,value_offset,value_len,ENC_BIG_ENDIAN);
|
|
}
|
|
} else {
|
|
switch(ber_class|(tag<<4)) {
|
|
case BER_CLASS_UNI|(BER_UNI_TAG_INTEGER<<4):
|
|
{
|
|
gint64 val=0;
|
|
unsigned int int_val_offset = value_offset;
|
|
unsigned int i;
|
|
|
|
max_len = 4; min_len = 1;
|
|
if (value_len > (guint)max_len || value_len < (guint)min_len) {
|
|
hfid = hf_snmp_integer32_value;
|
|
format_error = BER_WRONG_LENGTH;
|
|
break;
|
|
}
|
|
|
|
if(value_len > 0) {
|
|
/* extend sign bit */
|
|
if(tvb_get_guint8(tvb, int_val_offset)&0x80) {
|
|
val=-1;
|
|
}
|
|
for(i=0;i<value_len;i++) {
|
|
val=(val<<8)|tvb_get_guint8(tvb, int_val_offset);
|
|
int_val_offset++;
|
|
}
|
|
}
|
|
pi_value = proto_tree_add_int64(pt_varbind, hf_snmp_integer32_value, tvb,value_offset,value_len, val);
|
|
|
|
goto already_added;
|
|
}
|
|
case BER_CLASS_UNI|(BER_UNI_TAG_OCTETSTRING<<4):
|
|
if(oid_info->value_hfid> -1){
|
|
hfid = oid_info->value_hfid;
|
|
}else{
|
|
hfid = hf_snmp_octetstring_value;
|
|
}
|
|
break;
|
|
case BER_CLASS_UNI|(BER_UNI_TAG_OID<<4):
|
|
max_len = -1; min_len = 1;
|
|
if (value_len < (guint)min_len) format_error = BER_WRONG_LENGTH;
|
|
hfid = hf_snmp_oid_value;
|
|
break;
|
|
case BER_CLASS_UNI|(BER_UNI_TAG_NULL<<4):
|
|
max_len = 0; min_len = 0;
|
|
if (value_len != 0) format_error = BER_WRONG_LENGTH;
|
|
hfid = hf_snmp_null_value;
|
|
break;
|
|
case BER_CLASS_APP: /* | (SNMP_IPA<<4)*/
|
|
switch(value_len) {
|
|
case 4: hfid = hf_snmp_ipv4_value; break;
|
|
case 16: hfid = hf_snmp_ipv6_value; break;
|
|
default: hfid = hf_snmp_anyaddress_value; break;
|
|
}
|
|
break;
|
|
case BER_CLASS_APP|(SNMP_U32<<4):
|
|
hfid = hf_snmp_unsigned32_value;
|
|
break;
|
|
case BER_CLASS_APP|(SNMP_GGE<<4):
|
|
hfid = hf_snmp_gauge32_value;
|
|
break;
|
|
case BER_CLASS_APP|(SNMP_CNT<<4):
|
|
hfid = hf_snmp_counter_value;
|
|
break;
|
|
case BER_CLASS_APP|(SNMP_TIT<<4):
|
|
hfid = hf_snmp_timeticks_value;
|
|
break;
|
|
case BER_CLASS_APP|(SNMP_OPQ<<4):
|
|
hfid = hf_snmp_opaque_value;
|
|
break;
|
|
case BER_CLASS_APP|(SNMP_NSP<<4):
|
|
hfid = hf_snmp_nsap_value;
|
|
break;
|
|
case BER_CLASS_APP|(SNMP_C64<<4):
|
|
hfid = hf_snmp_big_counter_value;
|
|
break;
|
|
default:
|
|
hfid = hf_snmp_unknown_value;
|
|
break;
|
|
}
|
|
if (value_len > 8) {
|
|
/*
|
|
* Too long for an FT_UINT64 or an FT_INT64.
|
|
*/
|
|
header_field_info *hfinfo = proto_registrar_get_nth(hfid);
|
|
if (hfinfo->type == FT_UINT64) {
|
|
/*
|
|
* Check if this is an unsigned int64 with
|
|
* a big value.
|
|
*/
|
|
if (value_len > 9 || tvb_get_guint8(tvb, value_offset) != 0) {
|
|
/* It is. Fail. */
|
|
proto_tree_add_expert_format(pt_varbind,actx->pinfo,&ei_snmp_uint_too_large,tvb,value_offset,value_len,"Integral value too large");
|
|
goto already_added;
|
|
}
|
|
/* Cheat and skip the leading 0 byte */
|
|
value_len--;
|
|
value_offset++;
|
|
} else if (hfinfo->type == FT_INT64) {
|
|
/*
|
|
* For now, just reject these.
|
|
*/
|
|
proto_tree_add_expert_format(pt_varbind,actx->pinfo,&ei_snmp_int_too_large,tvb,value_offset,value_len,"Integral value too large or too small");
|
|
goto already_added;
|
|
}
|
|
} else if (value_len == 0) {
|
|
/*
|
|
* X.690 section 8.3.1 "Encoding of an integer value":
|
|
* "The encoding of an integer value shall be
|
|
* primitive. The contents octets shall consist of
|
|
* one or more octets."
|
|
*
|
|
* Zero is not "one or more".
|
|
*/
|
|
header_field_info *hfinfo = proto_registrar_get_nth(hfid);
|
|
if (hfinfo->type == FT_UINT64 || hfinfo->type == FT_INT64) {
|
|
proto_tree_add_expert_format(pt_varbind,actx->pinfo,&ei_snmp_integral_value0,tvb,value_offset,value_len,"Integral value is zero-length");
|
|
goto already_added;
|
|
}
|
|
}
|
|
/* Special case DATE AND TIME */
|
|
if((oid_info->value_type)&&(oid_info->value_type->keytype == OID_KEY_TYPE_DATE_AND_TIME)&&(value_len > 7)){
|
|
pi_value = dissect_snmp_variable_date_and_time(pt_varbind, actx->pinfo, hfid, tvb, value_offset, value_len);
|
|
}else{
|
|
pi_value = proto_tree_add_item(pt_varbind,hfid,tvb,value_offset,value_len,ENC_BIG_ENDIAN);
|
|
}
|
|
if (format_error != BER_NO_ERROR) {
|
|
expert_add_info(actx->pinfo, pi_value, &ei_snmp_missing_mib);
|
|
}
|
|
|
|
}
|
|
already_added:
|
|
pt_value = proto_item_add_subtree(pi_value,ett_value);
|
|
|
|
if (value_len > 0 && oid_string) {
|
|
tvbuff_t* sub_tvb = tvb_new_subset_length(tvb, value_offset, value_len);
|
|
|
|
next_tvb_add_string(var_list, sub_tvb, (snmp_var_in_tree) ? pt_value : NULL, value_sub_dissectors_table, oid_string);
|
|
}
|
|
|
|
|
|
set_label:
|
|
if (pi_value) proto_item_fill_label(PITEM_FINFO(pi_value), label);
|
|
|
|
if (oid_info && oid_info->name) {
|
|
if (oid_left >= 1) {
|
|
repr = wmem_strdup_printf(actx->pinfo->pool, "%s.%s (%s)", oid_info->name,
|
|
oid_subid2string(actx->pinfo->pool, &(subids[oid_matched]),oid_left),
|
|
oid_subid2string(actx->pinfo->pool, subids,oid_matched+oid_left));
|
|
info_oid = wmem_strdup_printf(actx->pinfo->pool, "%s.%s", oid_info->name,
|
|
oid_subid2string(actx->pinfo->pool, &(subids[oid_matched]),oid_left));
|
|
} else {
|
|
repr = wmem_strdup_printf(actx->pinfo->pool, "%s (%s)", oid_info->name,
|
|
oid_subid2string(actx->pinfo->pool, subids,oid_matched));
|
|
info_oid = oid_info->name;
|
|
}
|
|
} else if (oid_string) {
|
|
repr = wmem_strdup(actx->pinfo->pool, oid_string);
|
|
info_oid = oid_string;
|
|
} else {
|
|
repr = wmem_strdup(actx->pinfo->pool, "[Bad OID]");
|
|
}
|
|
|
|
valstr = strstr(label,": ");
|
|
valstr = valstr ? valstr+2 : label;
|
|
|
|
proto_item_set_text(pi_varbind,"%s: %s",repr,valstr);
|
|
|
|
if (display_oid && info_oid) {
|
|
col_append_fstr (actx->pinfo->cinfo, COL_INFO, " %s", info_oid);
|
|
}
|
|
|
|
switch (format_error) {
|
|
case BER_WRONG_LENGTH: {
|
|
proto_item* pi;
|
|
proto_tree* p_tree = proto_item_add_subtree(pi_value,ett_decoding_error);
|
|
pt = proto_tree_add_subtree_format(p_tree,tvb,0,0,ett_decoding_error,&pi,
|
|
"Wrong value length: %u expecting: %u <= len <= %u",
|
|
value_len, min_len, max_len == -1 ? 0xFFFFFF : max_len);
|
|
expert_add_info(actx->pinfo, pi, &ei_snmp_varbind_wrong_length_value);
|
|
return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
|
|
}
|
|
case BER_WRONG_TAG: {
|
|
proto_item* pi;
|
|
proto_tree* p_tree = proto_item_add_subtree(pi_value,ett_decoding_error);
|
|
pt = proto_tree_add_subtree_format(p_tree,tvb,0,0,ett_decoding_error,&pi,
|
|
"Wrong class/tag for Value expected: %d,%d got: %d,%d",
|
|
oid_info->value_type->ber_class, oid_info->value_type->ber_tag,
|
|
ber_class, tag);
|
|
expert_add_info(actx->pinfo, pi, &ei_snmp_varbind_wrong_class_tag);
|
|
return dissect_unknown_ber(actx->pinfo, tvb, value_start, pt);
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return seq_offset + seq_len;
|
|
}
|
|
|
|
|
|
#define F_SNMP_ENGINEID_CONFORM 0x80
|
|
#define SNMP_ENGINEID_RFC1910 0x00
|
|
#define SNMP_ENGINEID_RFC3411 0x01
|
|
|
|
static const true_false_string tfs_snmp_engineid_conform = {
|
|
"RFC3411 (SNMPv3)",
|
|
"RFC1910 (Non-SNMPv3)"
|
|
};
|
|
|
|
#define SNMP_ENGINEID_FORMAT_IPV4 0x01
|
|
#define SNMP_ENGINEID_FORMAT_IPV6 0x02
|
|
#define SNMP_ENGINEID_FORMAT_MACADDRESS 0x03
|
|
#define SNMP_ENGINEID_FORMAT_TEXT 0x04
|
|
#define SNMP_ENGINEID_FORMAT_OCTETS 0x05
|
|
|
|
static const value_string snmp_engineid_format_vals[] = {
|
|
{ SNMP_ENGINEID_FORMAT_IPV4, "IPv4 address" },
|
|
{ SNMP_ENGINEID_FORMAT_IPV6, "IPv6 address" },
|
|
{ SNMP_ENGINEID_FORMAT_MACADDRESS, "MAC address" },
|
|
{ SNMP_ENGINEID_FORMAT_TEXT, "Text, administratively assigned" },
|
|
{ SNMP_ENGINEID_FORMAT_OCTETS, "Octets, administratively assigned" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define SNMP_ENGINEID_CISCO_AGENT 0x00
|
|
#define SNMP_ENGINEID_CISCO_MANAGER 0x01
|
|
|
|
static const value_string snmp_engineid_cisco_type_vals[] = {
|
|
{ SNMP_ENGINEID_CISCO_AGENT, "Agent" },
|
|
{ SNMP_ENGINEID_CISCO_MANAGER, "Manager" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/*
|
|
* SNMP Engine ID dissection according to RFC 3411 (SnmpEngineID TC)
|
|
* or historic RFC 1910 (AgentID)
|
|
*/
|
|
int
|
|
dissect_snmp_engineid(proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb, int offset, int len)
|
|
{
|
|
proto_item *item = NULL;
|
|
guint8 conformance, format;
|
|
guint32 enterpriseid;
|
|
time_t seconds;
|
|
nstime_t ts;
|
|
int len_remain = len;
|
|
|
|
/* first bit: engine id conformance */
|
|
if (len_remain<1) return offset;
|
|
conformance = ((tvb_get_guint8(tvb, offset)>>7) & 0x01);
|
|
proto_tree_add_item(tree, hf_snmp_engineid_conform, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
/* 4-byte enterprise number/name */
|
|
if (len_remain<4) return offset;
|
|
enterpriseid = tvb_get_ntohl(tvb, offset);
|
|
if (conformance)
|
|
enterpriseid -= 0x80000000; /* ignore first bit */
|
|
proto_tree_add_uint(tree, hf_snmp_engineid_enterprise, tvb, offset, 4, enterpriseid);
|
|
offset+=4;
|
|
len_remain-=4;
|
|
|
|
switch(conformance) {
|
|
|
|
case SNMP_ENGINEID_RFC1910:
|
|
/* 12-byte AgentID w/ 8-byte trailer */
|
|
if (len_remain==8) {
|
|
proto_tree_add_item(tree, hf_snmp_agentid_trailer, tvb, offset, 8, ENC_NA);
|
|
offset+=8;
|
|
len_remain-=8;
|
|
} else {
|
|
proto_tree_add_expert(tree, pinfo, &ei_snmp_rfc1910_non_conformant, tvb, offset, len_remain);
|
|
return offset;
|
|
}
|
|
break;
|
|
|
|
case SNMP_ENGINEID_RFC3411: /* variable length: 5..32 */
|
|
|
|
/* 1-byte format specifier */
|
|
if (len_remain<1) return offset;
|
|
format = tvb_get_guint8(tvb, offset);
|
|
item = proto_tree_add_uint_format(tree, hf_snmp_engineid_format, tvb, offset, 1, format, "Engine ID Format: %s (%d)",
|
|
val_to_str(format, snmp_engineid_format_vals, "Reserved/Enterprise-specific"), format);
|
|
offset+=1;
|
|
len_remain-=1;
|
|
|
|
switch(format) {
|
|
case SNMP_ENGINEID_FORMAT_IPV4:
|
|
/* 4-byte IPv4 address */
|
|
if (len_remain==4) {
|
|
proto_tree_add_item(tree, hf_snmp_engineid_ipv4, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset+=4;
|
|
len_remain=0;
|
|
}
|
|
break;
|
|
case SNMP_ENGINEID_FORMAT_IPV6:
|
|
/* 16-byte IPv6 address */
|
|
if (len_remain==16) {
|
|
proto_tree_add_item(tree, hf_snmp_engineid_ipv6, tvb, offset, 16, ENC_NA);
|
|
offset+=16;
|
|
len_remain=0;
|
|
}
|
|
break;
|
|
case SNMP_ENGINEID_FORMAT_MACADDRESS:
|
|
/* See: https://supportforums.cisco.com/message/3010617#3010617 for details. */
|
|
if ((enterpriseid==9)&&(len_remain==7)) {
|
|
proto_tree_add_item(tree, hf_snmp_engineid_cisco_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
len_remain--;
|
|
}
|
|
/* 6-byte MAC address */
|
|
if (len_remain==6) {
|
|
proto_tree_add_item(tree, hf_snmp_engineid_mac, tvb, offset, 6, ENC_NA);
|
|
offset+=6;
|
|
len_remain=0;
|
|
}
|
|
break;
|
|
case SNMP_ENGINEID_FORMAT_TEXT:
|
|
/* max. 27-byte string, administratively assigned */
|
|
if (len_remain<=27) {
|
|
proto_tree_add_item(tree, hf_snmp_engineid_text, tvb, offset, len_remain, ENC_ASCII);
|
|
offset+=len_remain;
|
|
len_remain=0;
|
|
}
|
|
break;
|
|
case 128:
|
|
/* most common enterprise-specific format: (ucd|net)-snmp random */
|
|
if ((enterpriseid==2021)||(enterpriseid==8072)) {
|
|
proto_item_append_text(item, (enterpriseid==2021) ? ": UCD-SNMP Random" : ": Net-SNMP Random");
|
|
/* demystify: 4B random, 4B/8B epoch seconds */
|
|
if ((len_remain==8) || (len_remain==12)) {
|
|
proto_tree_add_item(tree, hf_snmp_engineid_data, tvb, offset, 4, ENC_NA);
|
|
if (len_remain==8) {
|
|
seconds = (time_t)tvb_get_letohl(tvb, offset + 4);
|
|
} else {
|
|
seconds = (time_t)tvb_get_letohi64(tvb, offset + 4);
|
|
}
|
|
ts.secs = seconds;
|
|
ts.nsecs = 0;
|
|
proto_tree_add_time_format_value(tree, hf_snmp_engineid_time, tvb, offset + 4, len_remain - 4,
|
|
&ts, "%s",
|
|
abs_time_secs_to_str(pinfo->pool, seconds, ABSOLUTE_TIME_LOCAL, TRUE));
|
|
offset+=len_remain;
|
|
len_remain=0;
|
|
}
|
|
break;
|
|
}
|
|
/* fall through */
|
|
case SNMP_ENGINEID_FORMAT_OCTETS:
|
|
default:
|
|
/* max. 27 bytes, administratively assigned or unknown format */
|
|
if (len_remain<=27) {
|
|
proto_tree_add_item(tree, hf_snmp_engineid_data, tvb, offset, len_remain, ENC_NA);
|
|
offset+=len_remain;
|
|
len_remain=0;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (len_remain>0) {
|
|
proto_tree_add_expert(tree, pinfo, &ei_snmp_rfc3411_non_conformant, tvb, offset, len_remain);
|
|
offset+=len_remain;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
|
|
static void set_ue_keys(snmp_ue_assoc_t* n ) {
|
|
guint key_size = auth_hash_len[n->user.authModel];
|
|
|
|
n->user.authKey.data = (guint8 *)g_malloc(key_size);
|
|
n->user.authKey.len = key_size;
|
|
snmp_usm_password_to_key(n->user.authModel,
|
|
n->user.authPassword.data,
|
|
n->user.authPassword.len,
|
|
n->engine.data,
|
|
n->engine.len,
|
|
n->user.authKey.data);
|
|
|
|
if (n->priv_proto == PRIV_AES128 || n->priv_proto == PRIV_AES192 || n->priv_proto == PRIV_AES256) {
|
|
guint need_key_len =
|
|
(n->priv_proto == PRIV_AES128) ? 16 :
|
|
(n->priv_proto == PRIV_AES192) ? 24 :
|
|
(n->priv_proto == PRIV_AES256) ? 32 :
|
|
0;
|
|
|
|
guint key_len = key_size;
|
|
|
|
while (key_len < need_key_len)
|
|
key_len += key_size;
|
|
|
|
n->user.privKey.data = (guint8 *)g_malloc(key_len);
|
|
n->user.privKey.len = need_key_len;
|
|
|
|
snmp_usm_password_to_key(n->user.authModel,
|
|
n->user.privPassword.data,
|
|
n->user.privPassword.len,
|
|
n->engine.data,
|
|
n->engine.len,
|
|
n->user.privKey.data);
|
|
|
|
key_len = key_size;
|
|
|
|
/* extend key if needed */
|
|
while (key_len < need_key_len) {
|
|
snmp_usm_password_to_key(n->user.authModel,
|
|
n->user.privKey.data,
|
|
key_len,
|
|
n->engine.data,
|
|
n->engine.len,
|
|
n->user.privKey.data + key_len);
|
|
|
|
key_len += key_size;
|
|
}
|
|
|
|
} else {
|
|
n->user.privKey.data = (guint8 *)g_malloc(key_size);
|
|
n->user.privKey.len = key_size;
|
|
snmp_usm_password_to_key(n->user.authModel,
|
|
n->user.privPassword.data,
|
|
n->user.privPassword.len,
|
|
n->engine.data,
|
|
n->engine.len,
|
|
n->user.privKey.data);
|
|
}
|
|
}
|
|
|
|
static snmp_ue_assoc_t*
|
|
ue_dup(snmp_ue_assoc_t* o)
|
|
{
|
|
snmp_ue_assoc_t* d = (snmp_ue_assoc_t*)g_memdup2(o,sizeof(snmp_ue_assoc_t));
|
|
|
|
d->user.authModel = o->user.authModel;
|
|
|
|
d->user.privProtocol = o->user.privProtocol;
|
|
|
|
d->user.userName.data = (guint8 *)g_memdup2(o->user.userName.data,o->user.userName.len);
|
|
d->user.userName.len = o->user.userName.len;
|
|
|
|
d->user.authPassword.data = o->user.authPassword.data ? (guint8 *)g_memdup2(o->user.authPassword.data,o->user.authPassword.len) : NULL;
|
|
d->user.authPassword.len = o->user.authPassword.len;
|
|
|
|
d->user.privPassword.data = o->user.privPassword.data ? (guint8 *)g_memdup2(o->user.privPassword.data,o->user.privPassword.len) : NULL;
|
|
d->user.privPassword.len = o->user.privPassword.len;
|
|
|
|
d->engine.len = o->engine.len;
|
|
|
|
if (d->engine.len) {
|
|
d->engine.data = (guint8 *)g_memdup2(o->engine.data,o->engine.len);
|
|
set_ue_keys(d);
|
|
}
|
|
|
|
return d;
|
|
|
|
}
|
|
|
|
static void*
|
|
snmp_users_copy_cb(void* dest, const void* orig, size_t len _U_)
|
|
{
|
|
const snmp_ue_assoc_t* o = (const snmp_ue_assoc_t*)orig;
|
|
snmp_ue_assoc_t* d = (snmp_ue_assoc_t*)dest;
|
|
|
|
d->auth_model = o->auth_model;
|
|
d->user.authModel = (snmp_usm_auth_model_t) o->auth_model;
|
|
|
|
d->priv_proto = o->priv_proto;
|
|
d->user.privProtocol = priv_protos[o->priv_proto];
|
|
|
|
d->user.userName.data = (guint8*)g_memdup2(o->user.userName.data,o->user.userName.len);
|
|
d->user.userName.len = o->user.userName.len;
|
|
|
|
d->user.authPassword.data = o->user.authPassword.data ? (guint8*)g_memdup2(o->user.authPassword.data,o->user.authPassword.len) : NULL;
|
|
d->user.authPassword.len = o->user.authPassword.len;
|
|
|
|
d->user.privPassword.data = o->user.privPassword.data ? (guint8*)g_memdup2(o->user.privPassword.data,o->user.privPassword.len) : NULL;
|
|
d->user.privPassword.len = o->user.privPassword.len;
|
|
|
|
d->engine.len = o->engine.len;
|
|
if (o->engine.data) {
|
|
d->engine.data = (guint8*)g_memdup2(o->engine.data,o->engine.len);
|
|
}
|
|
|
|
d->user.authKey.data = o->user.authKey.data ? (guint8*)g_memdup2(o->user.authKey.data,o->user.authKey.len) : NULL;
|
|
d->user.authKey.len = o->user.authKey.len;
|
|
|
|
d->user.privKey.data = o->user.privKey.data ? (guint8*)g_memdup2(o->user.privKey.data,o->user.privKey.len) : NULL;
|
|
d->user.privKey.len = o->user.privKey.len;
|
|
|
|
return d;
|
|
}
|
|
|
|
static void
|
|
snmp_users_free_cb(void* p)
|
|
{
|
|
snmp_ue_assoc_t* ue = (snmp_ue_assoc_t*)p;
|
|
g_free(ue->user.userName.data);
|
|
g_free(ue->user.authPassword.data);
|
|
g_free(ue->user.privPassword.data);
|
|
g_free(ue->user.authKey.data);
|
|
g_free(ue->user.privKey.data);
|
|
g_free(ue->engine.data);
|
|
}
|
|
|
|
static gboolean
|
|
snmp_users_update_cb(void* p _U_, char** err)
|
|
{
|
|
snmp_ue_assoc_t* ue = (snmp_ue_assoc_t*)p;
|
|
GString* es = g_string_new("");
|
|
unsigned int i;
|
|
|
|
*err = NULL;
|
|
|
|
if (! ue->user.userName.len) {
|
|
g_string_append_printf(es,"no userName\n");
|
|
} else if ((ue->engine.len > 0) && (ue->engine.len < 5 || ue->engine.len > 32)) {
|
|
/* RFC 3411 section 5 */
|
|
g_string_append_printf(es, "Invalid engineId length (%u). Must be between 5 and 32 (10 and 64 hex digits)\n", ue->engine.len);
|
|
} else if (num_ueas) {
|
|
for (i=0; i<num_ueas-1; i++) {
|
|
snmp_ue_assoc_t* u = &(ueas[i]);
|
|
|
|
if ( u->user.userName.len == ue->user.userName.len
|
|
&& u->engine.len == ue->engine.len && (u != ue)) {
|
|
|
|
if (u->engine.len > 0 && memcmp( u->engine.data, ue->engine.data, u->engine.len ) == 0) {
|
|
if ( memcmp( u->user.userName.data, ue->user.userName.data, ue->user.userName.len ) == 0 ) {
|
|
/* XXX: make a string for the engineId */
|
|
g_string_append_printf(es,"Duplicate key (userName='%s')\n",ue->user.userName.data);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (u->engine.len == 0) {
|
|
if ( memcmp( u->user.userName.data, ue->user.userName.data, ue->user.userName.len ) == 0 ) {
|
|
g_string_append_printf(es,"Duplicate key (userName='%s' engineId=NONE)\n",ue->user.userName.data);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (es->len) {
|
|
es = g_string_truncate(es,es->len-1);
|
|
*err = g_string_free(es, FALSE);
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
free_ue_cache(snmp_ue_assoc_t **cache)
|
|
{
|
|
static snmp_ue_assoc_t *a, *nxt;
|
|
|
|
for (a = *cache; a; a = nxt) {
|
|
nxt = a->next;
|
|
snmp_users_free_cb(a);
|
|
g_free(a);
|
|
}
|
|
|
|
*cache = NULL;
|
|
}
|
|
|
|
#define CACHE_INSERT(c,a) if (c) { snmp_ue_assoc_t* t = c; c = a; c->next = t; } else { c = a; a->next = NULL; }
|
|
|
|
static void
|
|
init_ue_cache(void)
|
|
{
|
|
guint i;
|
|
|
|
for (i = 0; i < num_ueas; i++) {
|
|
snmp_ue_assoc_t* a = ue_dup(&(ueas[i]));
|
|
|
|
if (a->engine.len) {
|
|
CACHE_INSERT(localized_ues,a);
|
|
|
|
} else {
|
|
CACHE_INSERT(unlocalized_ues,a);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
static void
|
|
cleanup_ue_cache(void)
|
|
{
|
|
free_ue_cache(&localized_ues);
|
|
free_ue_cache(&unlocalized_ues);
|
|
}
|
|
|
|
/* Called when the user applies changes to UAT preferences. */
|
|
static void
|
|
renew_ue_cache(void)
|
|
{
|
|
cleanup_ue_cache();
|
|
init_ue_cache();
|
|
}
|
|
|
|
|
|
static snmp_ue_assoc_t*
|
|
localize_ue( snmp_ue_assoc_t* o, const guint8* engine, guint engine_len )
|
|
{
|
|
snmp_ue_assoc_t* n = (snmp_ue_assoc_t*)g_memdup2(o,sizeof(snmp_ue_assoc_t));
|
|
|
|
n->user.userName.data = (guint8*)g_memdup2(o->user.userName.data,o->user.userName.len);
|
|
n->user.authModel = o->user.authModel;
|
|
n->user.authPassword.data = (guint8*)g_memdup2(o->user.authPassword.data,o->user.authPassword.len);
|
|
n->user.authPassword.len = o->user.authPassword.len;
|
|
n->user.privPassword.data = (guint8*)g_memdup2(o->user.privPassword.data,o->user.privPassword.len);
|
|
n->user.privPassword.len = o->user.privPassword.len;
|
|
n->user.authKey.data = (guint8*)g_memdup2(o->user.authKey.data,o->user.authKey.len);
|
|
n->user.privKey.data = (guint8*)g_memdup2(o->user.privKey.data,o->user.privKey.len);
|
|
n->engine.data = (guint8*)g_memdup2(engine,engine_len);
|
|
n->engine.len = engine_len;
|
|
n->priv_proto = o->priv_proto;
|
|
|
|
set_ue_keys(n);
|
|
|
|
return n;
|
|
}
|
|
|
|
|
|
#define localized_match(a,u,ul,e,el) \
|
|
( a->user.userName.len == ul \
|
|
&& a->engine.len == el \
|
|
&& memcmp( a->user.userName.data, u, ul ) == 0 \
|
|
&& memcmp( a->engine.data, e, el ) == 0 )
|
|
|
|
#define unlocalized_match(a,u,l) \
|
|
( a->user.userName.len == l && memcmp( a->user.userName.data, u, l) == 0 )
|
|
|
|
static snmp_ue_assoc_t*
|
|
get_user_assoc(tvbuff_t* engine_tvb, tvbuff_t* user_tvb, packet_info *pinfo)
|
|
{
|
|
static snmp_ue_assoc_t* a;
|
|
guint given_username_len;
|
|
guint8* given_username;
|
|
guint given_engine_len = 0;
|
|
guint8* given_engine = NULL;
|
|
|
|
if ( ! (localized_ues || unlocalized_ues ) ) return NULL;
|
|
|
|
if (! ( user_tvb && engine_tvb ) ) return NULL;
|
|
|
|
given_username_len = tvb_captured_length(user_tvb);
|
|
given_engine_len = tvb_captured_length(engine_tvb);
|
|
if (! ( given_engine_len && given_username_len ) ) return NULL;
|
|
given_username = (guint8*)tvb_memdup(pinfo->pool,user_tvb,0,-1);
|
|
given_engine = (guint8*)tvb_memdup(pinfo->pool,engine_tvb,0,-1);
|
|
|
|
for (a = localized_ues; a; a = a->next) {
|
|
if ( localized_match(a, given_username, given_username_len, given_engine, given_engine_len) ) {
|
|
return a;
|
|
}
|
|
}
|
|
|
|
for (a = unlocalized_ues; a; a = a->next) {
|
|
if ( unlocalized_match(a, given_username, given_username_len) ) {
|
|
snmp_ue_assoc_t* n = localize_ue( a, given_engine, given_engine_len );
|
|
CACHE_INSERT(localized_ues,n);
|
|
return n;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static gboolean
|
|
snmp_usm_auth(const packet_info *pinfo, const snmp_usm_auth_model_t model, snmp_usm_params_t* p, guint8** calc_auth_p,
|
|
guint* calc_auth_len_p, gchar const** error)
|
|
{
|
|
gint msg_len;
|
|
guint8* msg;
|
|
guint auth_len;
|
|
guint8* auth;
|
|
guint8* key;
|
|
guint key_len;
|
|
guint8 *calc_auth;
|
|
guint start;
|
|
guint end;
|
|
guint i;
|
|
|
|
if (!p->auth_tvb) {
|
|
*error = "No Authenticator";
|
|
return FALSE;
|
|
}
|
|
|
|
key = p->user_assoc->user.authKey.data;
|
|
key_len = p->user_assoc->user.authKey.len;
|
|
|
|
if (! key ) {
|
|
*error = "User has no authKey";
|
|
return FALSE;
|
|
}
|
|
|
|
auth_len = tvb_captured_length(p->auth_tvb);
|
|
|
|
if (auth_len != auth_tag_len[model]) {
|
|
*error = "Authenticator length wrong";
|
|
return FALSE;
|
|
}
|
|
|
|
msg_len = tvb_captured_length(p->msg_tvb);
|
|
if (msg_len <= 0) {
|
|
*error = "Not enough data remaining";
|
|
return FALSE;
|
|
}
|
|
msg = (guint8*)tvb_memdup(pinfo->pool,p->msg_tvb,0,msg_len);
|
|
|
|
auth = (guint8*)tvb_memdup(pinfo->pool,p->auth_tvb,0,auth_len);
|
|
|
|
start = p->auth_offset - p->start_offset;
|
|
end = start + auth_len;
|
|
|
|
/* fill the authenticator with zeros */
|
|
for ( i = start ; i < end ; i++ ) {
|
|
msg[i] = '\0';
|
|
}
|
|
|
|
calc_auth = (guint8*)wmem_alloc(pinfo->pool, auth_hash_len[model]);
|
|
|
|
if (ws_hmac_buffer(auth_hash_algo[model], calc_auth, msg, msg_len, key, key_len)) {
|
|
return FALSE;
|
|
}
|
|
|
|
if (calc_auth_p) *calc_auth_p = calc_auth;
|
|
if (calc_auth_len_p) *calc_auth_len_p = auth_len;
|
|
|
|
return ( memcmp(auth,calc_auth,auth_len) != 0 ) ? FALSE : TRUE;
|
|
}
|
|
|
|
static tvbuff_t*
|
|
snmp_usm_priv_des(snmp_usm_params_t* p, tvbuff_t* encryptedData, packet_info *pinfo, gchar const** error)
|
|
{
|
|
gcry_error_t err;
|
|
gcry_cipher_hd_t hd = NULL;
|
|
|
|
guint8* cleartext;
|
|
guint8* des_key = p->user_assoc->user.privKey.data; /* first 8 bytes */
|
|
guint8* pre_iv = &(p->user_assoc->user.privKey.data[8]); /* last 8 bytes */
|
|
guint8* salt;
|
|
gint salt_len;
|
|
gint cryptgrm_len;
|
|
guint8* cryptgrm;
|
|
tvbuff_t* clear_tvb;
|
|
guint8 iv[8];
|
|
guint i;
|
|
|
|
|
|
salt_len = tvb_captured_length(p->priv_tvb);
|
|
|
|
if (salt_len != 8) {
|
|
*error = "decryptionError: msgPrivacyParameters length != 8";
|
|
return NULL;
|
|
}
|
|
|
|
salt = (guint8*)tvb_memdup(pinfo->pool,p->priv_tvb,0,salt_len);
|
|
|
|
/*
|
|
The resulting "salt" is XOR-ed with the pre-IV to obtain the IV.
|
|
*/
|
|
for (i=0; i<8; i++) {
|
|
iv[i] = pre_iv[i] ^ salt[i];
|
|
}
|
|
|
|
cryptgrm_len = tvb_captured_length(encryptedData);
|
|
|
|
if ((cryptgrm_len <= 0) || (cryptgrm_len % 8)) {
|
|
*error = "decryptionError: the length of the encrypted data is not a multiple of 8 octets";
|
|
return NULL;
|
|
}
|
|
|
|
cryptgrm = (guint8*)tvb_memdup(pinfo->pool,encryptedData,0,-1);
|
|
|
|
cleartext = (guint8*)wmem_alloc(pinfo->pool, cryptgrm_len);
|
|
|
|
err = gcry_cipher_open(&hd, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_CBC, 0);
|
|
if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
|
|
|
|
err = gcry_cipher_setiv(hd, iv, 8);
|
|
if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
|
|
|
|
err = gcry_cipher_setkey(hd,des_key,8);
|
|
if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
|
|
|
|
err = gcry_cipher_decrypt(hd, cleartext, cryptgrm_len, cryptgrm, cryptgrm_len);
|
|
if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
|
|
|
|
gcry_cipher_close(hd);
|
|
|
|
clear_tvb = tvb_new_child_real_data(encryptedData, cleartext, cryptgrm_len, cryptgrm_len);
|
|
|
|
return clear_tvb;
|
|
|
|
on_gcry_error:
|
|
*error = (const gchar *)gcry_strerror(err);
|
|
if (hd) gcry_cipher_close(hd);
|
|
return NULL;
|
|
}
|
|
|
|
static tvbuff_t*
|
|
snmp_usm_priv_aes_common(snmp_usm_params_t* p, tvbuff_t* encryptedData, packet_info *pinfo, gchar const** error, int algo)
|
|
{
|
|
gcry_error_t err;
|
|
gcry_cipher_hd_t hd = NULL;
|
|
|
|
guint8* cleartext;
|
|
guint8* aes_key = p->user_assoc->user.privKey.data;
|
|
int aes_key_len = p->user_assoc->user.privKey.len;
|
|
guint8 iv[16];
|
|
gint priv_len;
|
|
gint cryptgrm_len;
|
|
guint8* cryptgrm;
|
|
tvbuff_t* clear_tvb;
|
|
|
|
priv_len = tvb_captured_length(p->priv_tvb);
|
|
|
|
if (priv_len != 8) {
|
|
*error = "decryptionError: msgPrivacyParameters length != 8";
|
|
return NULL;
|
|
}
|
|
|
|
iv[0] = (p->boots & 0xff000000) >> 24;
|
|
iv[1] = (p->boots & 0x00ff0000) >> 16;
|
|
iv[2] = (p->boots & 0x0000ff00) >> 8;
|
|
iv[3] = (p->boots & 0x000000ff);
|
|
iv[4] = (p->snmp_time & 0xff000000) >> 24;
|
|
iv[5] = (p->snmp_time & 0x00ff0000) >> 16;
|
|
iv[6] = (p->snmp_time & 0x0000ff00) >> 8;
|
|
iv[7] = (p->snmp_time & 0x000000ff);
|
|
tvb_memcpy(p->priv_tvb,&(iv[8]),0,8);
|
|
|
|
cryptgrm_len = tvb_captured_length(encryptedData);
|
|
if (cryptgrm_len <= 0) {
|
|
*error = "Not enough data remaining";
|
|
return NULL;
|
|
}
|
|
cryptgrm = (guint8*)tvb_memdup(pinfo->pool,encryptedData,0,-1);
|
|
|
|
cleartext = (guint8*)wmem_alloc(pinfo->pool, cryptgrm_len);
|
|
|
|
err = gcry_cipher_open(&hd, algo, GCRY_CIPHER_MODE_CFB, 0);
|
|
if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
|
|
|
|
err = gcry_cipher_setiv(hd, iv, 16);
|
|
if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
|
|
|
|
err = gcry_cipher_setkey(hd,aes_key,aes_key_len);
|
|
if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
|
|
|
|
err = gcry_cipher_decrypt(hd, cleartext, cryptgrm_len, cryptgrm, cryptgrm_len);
|
|
if (err != GPG_ERR_NO_ERROR) goto on_gcry_error;
|
|
|
|
gcry_cipher_close(hd);
|
|
|
|
clear_tvb = tvb_new_child_real_data(encryptedData, cleartext, cryptgrm_len, cryptgrm_len);
|
|
|
|
return clear_tvb;
|
|
|
|
on_gcry_error:
|
|
*error = (const gchar *)gcry_strerror(err);
|
|
if (hd) gcry_cipher_close(hd);
|
|
return NULL;
|
|
}
|
|
|
|
static tvbuff_t*
|
|
snmp_usm_priv_aes128(snmp_usm_params_t* p, tvbuff_t* encryptedData, packet_info *pinfo, gchar const** error)
|
|
{
|
|
return snmp_usm_priv_aes_common(p, encryptedData, pinfo, error, GCRY_CIPHER_AES);
|
|
}
|
|
|
|
static tvbuff_t*
|
|
snmp_usm_priv_aes192(snmp_usm_params_t* p, tvbuff_t* encryptedData, packet_info *pinfo, gchar const** error)
|
|
{
|
|
return snmp_usm_priv_aes_common(p, encryptedData, pinfo, error, GCRY_CIPHER_AES192);
|
|
}
|
|
|
|
static tvbuff_t*
|
|
snmp_usm_priv_aes256(snmp_usm_params_t* p, tvbuff_t* encryptedData, packet_info *pinfo, gchar const** error)
|
|
{
|
|
return snmp_usm_priv_aes_common(p, encryptedData, pinfo, error, GCRY_CIPHER_AES256);
|
|
}
|
|
|
|
static gboolean
|
|
check_ScopedPdu(tvbuff_t* tvb)
|
|
{
|
|
int offset;
|
|
gint8 ber_class;
|
|
gboolean pc;
|
|
gint32 tag;
|
|
int hoffset, eoffset;
|
|
guint32 len;
|
|
|
|
offset = get_ber_identifier(tvb, 0, &ber_class, &pc, &tag);
|
|
offset = get_ber_length(tvb, offset, NULL, NULL);
|
|
|
|
if ( ! (((ber_class!=BER_CLASS_APP) && (ber_class!=BER_CLASS_PRI) )
|
|
&& ( (!pc) || (ber_class!=BER_CLASS_UNI) || (tag!=BER_UNI_TAG_ENUMERATED) )
|
|
)) return FALSE;
|
|
|
|
if((tvb_get_guint8(tvb, offset)==0)&&(tvb_get_guint8(tvb, offset+1)==0))
|
|
return TRUE;
|
|
|
|
hoffset = offset;
|
|
|
|
offset = get_ber_identifier(tvb, offset, &ber_class, &pc, &tag);
|
|
offset = get_ber_length(tvb, offset, &len, NULL);
|
|
eoffset = offset + len;
|
|
|
|
if (eoffset <= hoffset) return FALSE;
|
|
|
|
if ((ber_class!=BER_CLASS_APP)&&(ber_class!=BER_CLASS_PRI))
|
|
if( (ber_class!=BER_CLASS_UNI)
|
|
||((tag<BER_UNI_TAG_NumericString)&&(tag!=BER_UNI_TAG_OCTETSTRING)&&(tag!=BER_UNI_TAG_UTF8String)) )
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
#include "packet-snmp-fn.c"
|
|
|
|
static snmp_conv_info_t*
|
|
snmp_find_conversation_and_get_conv_data(packet_info *pinfo) {
|
|
|
|
conversation_t *conversation;
|
|
snmp_conv_info_t *snmp_info = NULL;
|
|
|
|
conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, conversation_pt_to_conversation_type(pinfo->ptype),
|
|
pinfo->srcport, pinfo->destport, 0);
|
|
|
|
if( (conversation == NULL) || (conversation_get_dissector(conversation, pinfo->num)!=snmp_handle) ) {
|
|
conversation = conversation_new(pinfo->num, &pinfo->src, &pinfo->dst, conversation_pt_to_conversation_type(pinfo->ptype),
|
|
pinfo->srcport, pinfo->destport, 0);
|
|
conversation_set_dissector(conversation, snmp_handle);
|
|
}
|
|
|
|
snmp_info = (snmp_conv_info_t *)conversation_get_proto_data(conversation, proto_snmp);
|
|
if (snmp_info == NULL) {
|
|
snmp_info = wmem_new0(wmem_file_scope(), snmp_conv_info_t);
|
|
snmp_info->request_response=wmem_map_new(wmem_file_scope(), g_int_hash, g_int_equal);
|
|
|
|
conversation_add_proto_data(conversation, proto_snmp, snmp_info);
|
|
}
|
|
return snmp_info;
|
|
}
|
|
|
|
guint
|
|
dissect_snmp_pdu(tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
proto_tree *tree, int proto, gint ett, gboolean is_tcp)
|
|
{
|
|
|
|
guint length_remaining;
|
|
gint8 ber_class;
|
|
gboolean pc, ind = 0;
|
|
gint32 tag;
|
|
guint32 len;
|
|
guint message_length;
|
|
int start_offset = offset;
|
|
guint32 version = 0;
|
|
tvbuff_t *next_tvb;
|
|
|
|
proto_tree *snmp_tree = NULL;
|
|
proto_item *item = NULL;
|
|
|
|
snmp_conv_info_t *snmp_info = snmp_find_conversation_and_get_conv_data(pinfo);
|
|
|
|
asn1_ctx_t asn1_ctx;
|
|
asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo);
|
|
|
|
asn1_ctx.private_data = snmp_info;
|
|
|
|
usm_p.msg_tvb = tvb;
|
|
usm_p.start_offset = tvb_offset_from_real_beginning(tvb);
|
|
usm_p.engine_tvb = NULL;
|
|
usm_p.user_tvb = NULL;
|
|
usm_p.auth_item = NULL;
|
|
usm_p.auth_tvb = NULL;
|
|
usm_p.auth_offset = 0;
|
|
usm_p.priv_tvb = NULL;
|
|
usm_p.user_assoc = NULL;
|
|
usm_p.authenticated = FALSE;
|
|
usm_p.encrypted = FALSE;
|
|
usm_p.boots = 0;
|
|
usm_p.snmp_time = 0;
|
|
usm_p.authOK = FALSE;
|
|
|
|
/*
|
|
* This will throw an exception if we don't have any data left.
|
|
* That's what we want. (See "tcp_dissect_pdus()", which is
|
|
* similar, but doesn't have to deal with ASN.1.
|
|
* XXX - can we make "tcp_dissect_pdus()" provide enough
|
|
* information to the "get_pdu_len" routine so that we could
|
|
* have that routine deal with ASN.1, and just use
|
|
* "tcp_dissect_pdus()"?)
|
|
*/
|
|
length_remaining = tvb_ensure_captured_length_remaining(tvb, offset);
|
|
|
|
/* NOTE: we have to parse the message piece by piece, since the
|
|
* capture length may be less than the message length: a 'global'
|
|
* parsing is likely to fail.
|
|
*/
|
|
|
|
/*
|
|
* If this is SNMP-over-TCP, we might have to do reassembly
|
|
* in order to read the "Sequence Of" header.
|
|
*/
|
|
if (is_tcp && snmp_desegment && pinfo->can_desegment) {
|
|
/*
|
|
* This is TCP, and we should, and can, do reassembly.
|
|
*
|
|
* Is the "Sequence Of" header split across segment
|
|
* boundaries? We require at least 6 bytes for the
|
|
* header, which allows for a 4-byte length (ASN.1
|
|
* BER).
|
|
*/
|
|
if (length_remaining < 6) {
|
|
/*
|
|
* Yes. Tell the TCP dissector where the data
|
|
* for this message starts in the data it handed
|
|
* us and that we need "some more data." Don't tell
|
|
* it exactly how many bytes we need because if/when
|
|
* we ask for even more (after the header) that will
|
|
* break reassembly.
|
|
*/
|
|
pinfo->desegment_offset = offset;
|
|
pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* OK, try to read the "Sequence Of" header; this gets the total
|
|
* length of the SNMP message.
|
|
*/
|
|
offset = get_ber_identifier(tvb, offset, &ber_class, &pc, &tag);
|
|
/*Get the total octet length of the SNMP data*/
|
|
offset = get_ber_length(tvb, offset, &len, &ind);
|
|
message_length = len + offset;
|
|
|
|
/*Get the SNMP version data*/
|
|
/*offset =*/ dissect_ber_integer(FALSE, &asn1_ctx, 0, tvb, offset, -1, &version);
|
|
|
|
|
|
/*
|
|
* If this is SNMP-over-TCP, we might have to do reassembly
|
|
* to get all of this message.
|
|
*/
|
|
if (is_tcp && snmp_desegment && pinfo->can_desegment) {
|
|
/*
|
|
* Yes - is the message split across segment boundaries?
|
|
*/
|
|
if (length_remaining < message_length) {
|
|
/*
|
|
* Yes. Tell the TCP dissector where the data
|
|
* for this message starts in the data it handed
|
|
* us, and how many more bytes we need, and
|
|
* return.
|
|
*/
|
|
pinfo->desegment_offset = start_offset;
|
|
pinfo->desegment_len =
|
|
message_length - length_remaining;
|
|
|
|
/*
|
|
* Return 0, which means "I didn't dissect anything
|
|
* because I don't have enough data - we need
|
|
* to desegment".
|
|
*/
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
var_list = next_tvb_list_new(pinfo->pool);
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, proto_get_protocol_short_name(find_protocol_by_id(proto)));
|
|
|
|
item = proto_tree_add_item(tree, proto, tvb, start_offset, message_length, ENC_BIG_ENDIAN);
|
|
snmp_tree = proto_item_add_subtree(item, ett);
|
|
|
|
switch (version) {
|
|
case 0: /* v1 */
|
|
case 1: /* v2c */
|
|
offset = dissect_snmp_Message(FALSE , tvb, start_offset, &asn1_ctx, snmp_tree, -1);
|
|
break;
|
|
case 2: /* v2u */
|
|
offset = dissect_snmp_Messagev2u(FALSE , tvb, start_offset, &asn1_ctx, snmp_tree, -1);
|
|
break;
|
|
/* v3 */
|
|
case 3:
|
|
offset = dissect_snmp_SNMPv3Message(FALSE , tvb, start_offset, &asn1_ctx, snmp_tree, -1);
|
|
break;
|
|
default:
|
|
/*
|
|
* Return the length remaining in the tvbuff, so
|
|
* if this is SNMP-over-TCP, our caller thinks there's
|
|
* nothing left to dissect.
|
|
*/
|
|
expert_add_info(pinfo, item, &ei_snmp_version_unknown);
|
|
return length_remaining;
|
|
break;
|
|
}
|
|
|
|
/* There may be appended data after the SNMP data, so treat as raw
|
|
* data which needs to be dissected in case of UDP as UDP is PDU oriented.
|
|
*/
|
|
if((!is_tcp) && (length_remaining > (guint)offset)) {
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
} else {
|
|
next_tvb_call(var_list, pinfo, tree, NULL, data_handle);
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
static gint
|
|
dissect_snmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
|
|
{
|
|
int offset;
|
|
gint8 tmp_class;
|
|
gboolean tmp_pc;
|
|
gint32 tmp_tag;
|
|
guint32 tmp_length;
|
|
gboolean tmp_ind;
|
|
|
|
/*
|
|
* See if this looks like SNMP or not. if not, return 0 so
|
|
* wireshark can try some other dissector instead.
|
|
*/
|
|
/* All SNMP packets are BER encoded and consist of a SEQUENCE
|
|
* that spans the entire PDU. The first item is an INTEGER that
|
|
* has the values 0-2 (version 1-3).
|
|
* if not it is not snmp.
|
|
*/
|
|
/* SNMP starts with a SEQUENCE */
|
|
offset = get_ber_identifier(tvb, 0, &tmp_class, &tmp_pc, &tmp_tag);
|
|
if((tmp_class!=BER_CLASS_UNI)||(tmp_tag!=BER_UNI_TAG_SEQUENCE)) {
|
|
return 0;
|
|
}
|
|
/* then comes a length which spans the rest of the tvb */
|
|
offset = get_ber_length(tvb, offset, &tmp_length, &tmp_ind);
|
|
/* if(tmp_length!=(guint32)tvb_reported_length_remaining(tvb, offset)) {
|
|
* Loosen the heuristic a bit to handle the case where data has intentionally
|
|
* been added after the snmp PDU ( UDP case)
|
|
*/
|
|
if ( pinfo->ptype == PT_UDP ) {
|
|
if(tmp_length>(guint32)tvb_reported_length_remaining(tvb, offset)) {
|
|
return 0;
|
|
}
|
|
}else{
|
|
if(tmp_length!=(guint32)tvb_reported_length_remaining(tvb, offset)) {
|
|
return 0;
|
|
}
|
|
}
|
|
/* then comes an INTEGER (version)*/
|
|
get_ber_identifier(tvb, offset, &tmp_class, &tmp_pc, &tmp_tag);
|
|
if((tmp_class!=BER_CLASS_UNI)||(tmp_tag!=BER_UNI_TAG_INTEGER)) {
|
|
return 0;
|
|
}
|
|
/* do we need to test that version is 0 - 2 (version1-3) ? */
|
|
|
|
|
|
/*
|
|
* The first SNMP packet goes to the SNMP port; the second one
|
|
* may come from some *other* port, but goes back to the same
|
|
* IP address and port as the ones from which the first packet
|
|
* came; all subsequent packets presumably go between those two
|
|
* IP addresses and ports.
|
|
*
|
|
* If this packet went to the SNMP port, we check to see if
|
|
* there's already a conversation with one address/port pair
|
|
* matching the source IP address and port of this packet,
|
|
* the other address matching the destination IP address of this
|
|
* packet, and any destination port.
|
|
*
|
|
* If not, we create one, with its address 1/port 1 pair being
|
|
* the source address/port of this packet, its address 2 being
|
|
* the destination address of this packet, and its port 2 being
|
|
* wildcarded, and give it the SNMP dissector as a dissector.
|
|
*/
|
|
|
|
return dissect_snmp_pdu(tvb, 0, pinfo, tree, proto_snmp, ett_snmp, FALSE);
|
|
}
|
|
|
|
static int
|
|
dissect_snmp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
int offset = 0;
|
|
guint message_len;
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) > 0) {
|
|
message_len = dissect_snmp_pdu(tvb, 0, pinfo, tree, proto_snmp, ett_snmp, TRUE);
|
|
if (message_len == 0) {
|
|
/*
|
|
* We don't have all the data for that message,
|
|
* so we need to do desegmentation;
|
|
* "dissect_snmp_pdu()" has set that up.
|
|
*/
|
|
break;
|
|
}
|
|
offset += message_len;
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
static int
|
|
dissect_smux(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
|
|
{
|
|
proto_tree *smux_tree = NULL;
|
|
proto_item *item = NULL;
|
|
|
|
var_list = next_tvb_list_new(pinfo->pool);
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMUX");
|
|
|
|
item = proto_tree_add_item(tree, proto_smux, tvb, 0, -1, ENC_NA);
|
|
smux_tree = proto_item_add_subtree(item, ett_smux);
|
|
|
|
return dissect_SMUX_PDUs_PDU(tvb, pinfo, smux_tree, data);
|
|
}
|
|
|
|
/*
|
|
MD5 Password to Key Algorithm from RFC 3414 A.2.1
|
|
SHA1 Password to Key Algorithm from RFC 3414 A.2.2
|
|
SHA2 Password to Key Algorithm from RFC 7860 9.3
|
|
*/
|
|
static void
|
|
snmp_usm_password_to_key(const snmp_usm_auth_model_t model, const guint8 *password,
|
|
guint passwordlen, const guint8 *engineID, guint engineLength, guint8 *key)
|
|
{
|
|
gcry_md_hd_t hash_handle;
|
|
guint8 *cp, password_buf[64];
|
|
guint32 password_index = 0;
|
|
guint32 count = 0, i;
|
|
guint hash_len;
|
|
|
|
if (gcry_md_open(&hash_handle, auth_hash_algo[model], 0)) {
|
|
return;
|
|
}
|
|
|
|
hash_len = auth_hash_len[model];
|
|
|
|
/**********************************************/
|
|
/* Use while loop until we've done 1 Megabyte */
|
|
/**********************************************/
|
|
while (count < 1048576) {
|
|
cp = password_buf;
|
|
if (passwordlen != 0) {
|
|
for (i = 0; i < 64; i++) {
|
|
/*************************************************/
|
|
/* Take the next octet of the password, wrapping */
|
|
/* to the beginning of the password as necessary.*/
|
|
/*************************************************/
|
|
*cp++ = password[password_index++ % passwordlen];
|
|
}
|
|
} else {
|
|
*cp = 0;
|
|
}
|
|
gcry_md_write(hash_handle, password_buf, 64);
|
|
count += 64;
|
|
}
|
|
memcpy(key, gcry_md_read(hash_handle, 0), hash_len);
|
|
gcry_md_close(hash_handle);
|
|
|
|
/*****************************************************/
|
|
/* Now localise the key with the engineID and pass */
|
|
/* through hash function to produce final key */
|
|
/* We ignore invalid engineLengths here. More strict */
|
|
/* checking is done in snmp_users_update_cb. */
|
|
/*****************************************************/
|
|
if (gcry_md_open(&hash_handle, auth_hash_algo[model], 0)) {
|
|
return;
|
|
}
|
|
gcry_md_write(hash_handle, key, hash_len);
|
|
gcry_md_write(hash_handle, engineID, engineLength);
|
|
gcry_md_write(hash_handle, key, hash_len);
|
|
memcpy(key, gcry_md_read(hash_handle, 0), hash_len);
|
|
gcry_md_close(hash_handle);
|
|
return;
|
|
}
|
|
|
|
static void
|
|
process_prefs(void)
|
|
{
|
|
}
|
|
|
|
UAT_LSTRING_CB_DEF(snmp_users,userName,snmp_ue_assoc_t,user.userName.data,user.userName.len)
|
|
UAT_LSTRING_CB_DEF(snmp_users,authPassword,snmp_ue_assoc_t,user.authPassword.data,user.authPassword.len)
|
|
UAT_LSTRING_CB_DEF(snmp_users,privPassword,snmp_ue_assoc_t,user.privPassword.data,user.privPassword.len)
|
|
UAT_BUFFER_CB_DEF(snmp_users,engine_id,snmp_ue_assoc_t,engine.data,engine.len)
|
|
UAT_VS_DEF(snmp_users,auth_model,snmp_ue_assoc_t,guint,0,"MD5")
|
|
UAT_VS_DEF(snmp_users,priv_proto,snmp_ue_assoc_t,guint,0,"DES")
|
|
|
|
static void *
|
|
snmp_specific_trap_copy_cb(void *dest, const void *orig, size_t len _U_)
|
|
{
|
|
snmp_st_assoc_t *u = (snmp_st_assoc_t *)dest;
|
|
const snmp_st_assoc_t *o = (const snmp_st_assoc_t *)orig;
|
|
|
|
u->enterprise = g_strdup(o->enterprise);
|
|
u->trap = o->trap;
|
|
u->desc = g_strdup(o->desc);
|
|
|
|
return dest;
|
|
}
|
|
|
|
static void
|
|
snmp_specific_trap_free_cb(void *r)
|
|
{
|
|
snmp_st_assoc_t *u = (snmp_st_assoc_t *)r;
|
|
|
|
g_free(u->enterprise);
|
|
g_free(u->desc);
|
|
}
|
|
|
|
UAT_CSTRING_CB_DEF(specific_traps, enterprise, snmp_st_assoc_t)
|
|
UAT_DEC_CB_DEF(specific_traps, trap, snmp_st_assoc_t)
|
|
UAT_CSTRING_CB_DEF(specific_traps, desc, snmp_st_assoc_t)
|
|
|
|
/*--- proto_register_snmp -------------------------------------------*/
|
|
void proto_register_snmp(void) {
|
|
/* List of fields */
|
|
static hf_register_info hf[] = {
|
|
{ &hf_snmp_response_in,
|
|
{ "Response In", "snmp.response_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"The response to this SNMP request is in this frame", HFILL }},
|
|
{ &hf_snmp_response_to,
|
|
{ "Response To", "snmp.response_to", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"This is a response to the SNMP request in this frame", HFILL }},
|
|
{ &hf_snmp_time,
|
|
{ "Time", "snmp.time", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
|
|
"The time between the Request and the Response", HFILL }},
|
|
{ &hf_snmp_v3_flags_auth,
|
|
{ "Authenticated", "snmp.v3.flags.auth", FT_BOOLEAN, 8,
|
|
TFS(&tfs_set_notset), TH_AUTH, NULL, HFILL }},
|
|
{ &hf_snmp_v3_flags_crypt,
|
|
{ "Encrypted", "snmp.v3.flags.crypt", FT_BOOLEAN, 8,
|
|
TFS(&tfs_set_notset), TH_CRYPT, NULL, HFILL }},
|
|
{ &hf_snmp_v3_flags_report,
|
|
{ "Reportable", "snmp.v3.flags.report", FT_BOOLEAN, 8,
|
|
TFS(&tfs_set_notset), TH_REPORT, NULL, HFILL }},
|
|
{ &hf_snmp_engineid_conform, {
|
|
"Engine ID Conformance", "snmp.engineid.conform", FT_BOOLEAN, 8,
|
|
TFS(&tfs_snmp_engineid_conform), F_SNMP_ENGINEID_CONFORM, "Engine ID RFC3411 Conformance", HFILL }},
|
|
{ &hf_snmp_engineid_enterprise, {
|
|
"Engine Enterprise ID", "snmp.engineid.enterprise", FT_UINT32, BASE_ENTERPRISES,
|
|
STRINGS_ENTERPRISES, 0, NULL, HFILL }},
|
|
{ &hf_snmp_engineid_format, {
|
|
"Engine ID Format", "snmp.engineid.format", FT_UINT8, BASE_DEC,
|
|
VALS(snmp_engineid_format_vals), 0, NULL, HFILL }},
|
|
{ &hf_snmp_engineid_ipv4, {
|
|
"Engine ID Data: IPv4 address", "snmp.engineid.ipv4", FT_IPv4, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_engineid_ipv6, {
|
|
"Engine ID Data: IPv6 address", "snmp.engineid.ipv6", FT_IPv6, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_engineid_cisco_type, {
|
|
"Engine ID Data: Cisco type", "snmp.engineid.cisco.type", FT_UINT8, BASE_HEX,
|
|
VALS(snmp_engineid_cisco_type_vals), 0, NULL, HFILL }},
|
|
{ &hf_snmp_engineid_mac, {
|
|
"Engine ID Data: MAC address", "snmp.engineid.mac", FT_ETHER, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_engineid_text, {
|
|
"Engine ID Data: Text", "snmp.engineid.text", FT_STRING, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_engineid_time, {
|
|
"Engine ID Data: Creation Time", "snmp.engineid.time", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_engineid_data, {
|
|
"Engine ID Data", "snmp.engineid.data", FT_BYTES, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_msgAuthentication, {
|
|
"Authentication", "snmp.v3.auth", FT_BOOLEAN, BASE_NONE,
|
|
TFS(&auth_flags), 0, NULL, HFILL }},
|
|
{ &hf_snmp_decryptedPDU, {
|
|
"Decrypted ScopedPDU", "snmp.decrypted_pdu", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Decrypted PDU", HFILL }},
|
|
{ &hf_snmp_noSuchObject, {
|
|
"noSuchObject", "snmp.noSuchObject", FT_NONE, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_noSuchInstance, {
|
|
"noSuchInstance", "snmp.noSuchInstance", FT_NONE, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_endOfMibView, {
|
|
"endOfMibView", "snmp.endOfMibView", FT_NONE, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_unSpecified, {
|
|
"unSpecified", "snmp.unSpecified", FT_NONE, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_snmp_integer32_value, {
|
|
"Value (Integer32)", "snmp.value.int", FT_INT64, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_octetstring_value, {
|
|
"Value (OctetString)", "snmp.value.octets", FT_BYTES, BASE_SHOW_ASCII_PRINTABLE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_oid_value, {
|
|
"Value (OID)", "snmp.value.oid", FT_OID, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_null_value, {
|
|
"Value (Null)", "snmp.value.null", FT_NONE, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_ipv4_value, {
|
|
"Value (IpAddress)", "snmp.value.ipv4", FT_IPv4, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_ipv6_value, {
|
|
"Value (IpAddress)", "snmp.value.ipv6", FT_IPv6, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_anyaddress_value, {
|
|
"Value (IpAddress)", "snmp.value.addr", FT_BYTES, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_unsigned32_value, {
|
|
"Value (Unsigned32)", "snmp.value.u32", FT_INT64, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_gauge32_value, {
|
|
"Value (Gauge32)", "snmp.value.g32", FT_INT64, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_unknown_value, {
|
|
"Value (Unknown)", "snmp.value.unk", FT_BYTES, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_counter_value, {
|
|
"Value (Counter32)", "snmp.value.counter", FT_UINT64, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_big_counter_value, {
|
|
"Value (Counter64)", "snmp.value.counter", FT_UINT64, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_nsap_value, {
|
|
"Value (NSAP)", "snmp.value.nsap", FT_UINT64, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_timeticks_value, {
|
|
"Value (Timeticks)", "snmp.value.timeticks", FT_UINT64, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_opaque_value, {
|
|
"Value (Opaque)", "snmp.value.opaque", FT_BYTES, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_objectname, {
|
|
"Object Name", "snmp.name", FT_OID, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_scalar_instance_index, {
|
|
"Scalar Instance Index", "snmp.name.index", FT_UINT64, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_var_bind_str, {
|
|
"Variable-binding-string", "snmp.var-bind_str", FT_STRING, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
{ &hf_snmp_agentid_trailer, {
|
|
"AgentID Trailer", "snmp.agentid_trailer", FT_BYTES, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
|
|
#include "packet-snmp-hfarr.c"
|
|
};
|
|
|
|
/* List of subtrees */
|
|
static gint *ett[] = {
|
|
&ett_snmp,
|
|
&ett_engineid,
|
|
&ett_msgFlags,
|
|
&ett_encryptedPDU,
|
|
&ett_decrypted,
|
|
&ett_authParameters,
|
|
&ett_internet,
|
|
&ett_varbind,
|
|
&ett_name,
|
|
&ett_value,
|
|
&ett_decoding_error,
|
|
#include "packet-snmp-ettarr.c"
|
|
};
|
|
static ei_register_info ei[] = {
|
|
{ &ei_snmp_failed_decrypted_data_pdu, { "snmp.failed_decrypted_data_pdu", PI_MALFORMED, PI_WARN, "Failed to decrypt encryptedPDU", EXPFILL }},
|
|
{ &ei_snmp_decrypted_data_bad_formatted, { "snmp.decrypted_data_bad_formatted", PI_MALFORMED, PI_WARN, "Decrypted data not formatted as expected, wrong key?", EXPFILL }},
|
|
{ &ei_snmp_verify_authentication_error, { "snmp.verify_authentication_error", PI_MALFORMED, PI_ERROR, "Error while verifying Message authenticity", EXPFILL }},
|
|
{ &ei_snmp_authentication_ok, { "snmp.authentication_ok", PI_CHECKSUM, PI_CHAT, "SNMP Authentication OK", EXPFILL }},
|
|
{ &ei_snmp_authentication_error, { "snmp.authentication_error", PI_CHECKSUM, PI_WARN, "SNMP Authentication Error", EXPFILL }},
|
|
{ &ei_snmp_varbind_not_uni_class_seq, { "snmp.varbind.not_uni_class_seq", PI_MALFORMED, PI_WARN, "VarBind is not an universal class sequence", EXPFILL }},
|
|
{ &ei_snmp_varbind_has_indicator, { "snmp.varbind.has_indicator", PI_MALFORMED, PI_WARN, "VarBind has indicator set", EXPFILL }},
|
|
{ &ei_snmp_objectname_not_oid, { "snmp.objectname_not_oid", PI_MALFORMED, PI_WARN, "ObjectName not an OID", EXPFILL }},
|
|
{ &ei_snmp_objectname_has_indicator, { "snmp.objectname_has_indicator", PI_MALFORMED, PI_WARN, "ObjectName has indicator set", EXPFILL }},
|
|
{ &ei_snmp_value_not_primitive_encoding, { "snmp.value_not_primitive_encoding", PI_MALFORMED, PI_WARN, "value not in primitive encoding", EXPFILL }},
|
|
{ &ei_snmp_invalid_oid, { "snmp.invalid_oid", PI_MALFORMED, PI_WARN, "invalid oid", EXPFILL }},
|
|
{ &ei_snmp_varbind_wrong_tag, { "snmp.varbind.wrong_tag", PI_MALFORMED, PI_WARN, "Wrong tag for SNMP VarBind error value", EXPFILL }},
|
|
{ &ei_snmp_varbind_response, { "snmp.varbind.response", PI_RESPONSE_CODE, PI_NOTE, "Response", EXPFILL }},
|
|
{ &ei_snmp_no_instance_subid, { "snmp.no_instance_subid", PI_MALFORMED, PI_WARN, "No instance sub-id in scalar value", EXPFILL }},
|
|
{ &ei_snmp_wrong_num_of_subids, { "snmp.wrong_num_of_subids", PI_MALFORMED, PI_WARN, "Wrong number of instance sub-ids in scalar value", EXPFILL }},
|
|
{ &ei_snmp_index_suboid_too_short, { "snmp.index_suboid_too_short", PI_MALFORMED, PI_WARN, "index sub-oid shorter than expected", EXPFILL }},
|
|
{ &ei_snmp_unimplemented_instance_index, { "snmp.unimplemented_instance_index", PI_UNDECODED, PI_WARN, "OID instaces not handled, if you want this implemented please contact the wireshark developers", EXPFILL }},
|
|
{ &ei_snmp_index_suboid_len0, { "snmp.ndex_suboid_len0", PI_MALFORMED, PI_WARN, "an index sub-oid OID cannot be 0 bytes long!", EXPFILL }},
|
|
{ &ei_snmp_index_suboid_too_long, { "snmp.index_suboid_too_long", PI_MALFORMED, PI_WARN, "index sub-oid should not be longer than remaining oid size", EXPFILL }},
|
|
{ &ei_snmp_index_string_too_long, { "snmp.index_string_too_long", PI_MALFORMED, PI_WARN, "index string should not be longer than remaining oid size", EXPFILL }},
|
|
{ &ei_snmp_column_parent_not_row, { "snmp.column_parent_not_row", PI_MALFORMED, PI_ERROR, "COLUMNS's parent is not a ROW", EXPFILL }},
|
|
{ &ei_snmp_uint_too_large, { "snmp.uint_too_large", PI_UNDECODED, PI_NOTE, "Unsigned integer value > 2^64 - 1", EXPFILL }},
|
|
{ &ei_snmp_int_too_large, { "snmp.int_too_large", PI_UNDECODED, PI_NOTE, "Signed integer value > 2^63 - 1 or <= -2^63", EXPFILL }},
|
|
{ &ei_snmp_integral_value0, { "snmp.integral_value0", PI_UNDECODED, PI_NOTE, "Integral value is zero-length", EXPFILL }},
|
|
{ &ei_snmp_missing_mib, { "snmp.missing_mib", PI_UNDECODED, PI_NOTE, "Unresolved value, Missing MIB", EXPFILL }},
|
|
{ &ei_snmp_varbind_wrong_length_value, { "snmp.varbind.wrong_length_value", PI_MALFORMED, PI_WARN, "Wrong length for SNMP VarBind/value", EXPFILL }},
|
|
{ &ei_snmp_varbind_wrong_class_tag, { "snmp.varbind.wrong_class_tag", PI_MALFORMED, PI_WARN, "Wrong class/tag for SNMP VarBind/value", EXPFILL }},
|
|
{ &ei_snmp_rfc1910_non_conformant, { "snmp.rfc1910_non_conformant", PI_PROTOCOL, PI_WARN, "Data not conforming to RFC1910", EXPFILL }},
|
|
{ &ei_snmp_rfc3411_non_conformant, { "snmp.rfc3411_non_conformant", PI_PROTOCOL, PI_WARN, "Data not conforming to RFC3411", EXPFILL }},
|
|
{ &ei_snmp_version_unknown, { "snmp.version.unknown", PI_PROTOCOL, PI_WARN, "Unknown version", EXPFILL }},
|
|
{ &ei_snmp_trap_pdu_obsolete, { "snmp.trap_pdu_obsolete", PI_PROTOCOL, PI_WARN, "Trap-PDU is obsolete in this SNMP version", EXPFILL }},
|
|
|
|
};
|
|
|
|
expert_module_t* expert_snmp;
|
|
module_t *snmp_module;
|
|
|
|
static uat_field_t users_fields[] = {
|
|
UAT_FLD_BUFFER(snmp_users,engine_id,"Engine ID","Engine-id for this entry (empty = any)"),
|
|
UAT_FLD_LSTRING(snmp_users,userName,"Username","The username"),
|
|
UAT_FLD_VS(snmp_users,auth_model,"Authentication model",auth_types,"Algorithm to be used for authentication."),
|
|
UAT_FLD_LSTRING(snmp_users,authPassword,"Password","The password used for authenticating packets for this entry"),
|
|
UAT_FLD_VS(snmp_users,priv_proto,"Privacy protocol",priv_types,"Algorithm to be used for privacy."),
|
|
UAT_FLD_LSTRING(snmp_users,privPassword,"Privacy password","The password used for encrypting packets for this entry"),
|
|
UAT_END_FIELDS
|
|
};
|
|
|
|
uat_t *assocs_uat = uat_new("SNMP Users",
|
|
sizeof(snmp_ue_assoc_t),
|
|
"snmp_users",
|
|
TRUE,
|
|
&ueas,
|
|
&num_ueas,
|
|
UAT_AFFECTS_DISSECTION, /* affects dissection of packets, but not set of named fields */
|
|
"ChSNMPUsersSection",
|
|
snmp_users_copy_cb,
|
|
snmp_users_update_cb,
|
|
snmp_users_free_cb,
|
|
renew_ue_cache,
|
|
NULL,
|
|
users_fields);
|
|
|
|
static uat_field_t specific_traps_flds[] = {
|
|
UAT_FLD_CSTRING(specific_traps,enterprise,"Enterprise OID","Enterprise Object Identifier"),
|
|
UAT_FLD_DEC(specific_traps,trap,"Trap Id","The specific-trap value"),
|
|
UAT_FLD_CSTRING(specific_traps,desc,"Description","Trap type description"),
|
|
UAT_END_FIELDS
|
|
};
|
|
|
|
uat_t* specific_traps_uat = uat_new("SNMP Enterprise Specific Trap Types",
|
|
sizeof(snmp_st_assoc_t),
|
|
"snmp_specific_traps",
|
|
TRUE,
|
|
&specific_traps,
|
|
&num_specific_traps,
|
|
UAT_AFFECTS_DISSECTION, /* affects dissection of packets, but not set of named fields */
|
|
"ChSNMPEnterpriseSpecificTrapTypes",
|
|
snmp_specific_trap_copy_cb,
|
|
NULL,
|
|
snmp_specific_trap_free_cb,
|
|
NULL,
|
|
NULL,
|
|
specific_traps_flds);
|
|
|
|
/* Register protocol */
|
|
proto_snmp = proto_register_protocol(PNAME, PSNAME, PFNAME);
|
|
snmp_handle = register_dissector("snmp", dissect_snmp, proto_snmp);
|
|
|
|
/* Register fields and subtrees */
|
|
proto_register_field_array(proto_snmp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_snmp = expert_register_protocol(proto_snmp);
|
|
expert_register_field_array(expert_snmp, ei, array_length(ei));
|
|
|
|
|
|
/* Register configuration preferences */
|
|
snmp_module = prefs_register_protocol(proto_snmp, process_prefs);
|
|
prefs_register_bool_preference(snmp_module, "display_oid",
|
|
"Show SNMP OID in info column",
|
|
"Whether the SNMP OID should be shown in the info column",
|
|
&display_oid);
|
|
|
|
prefs_register_obsolete_preference(snmp_module, "mib_modules");
|
|
prefs_register_obsolete_preference(snmp_module, "users_file");
|
|
|
|
prefs_register_bool_preference(snmp_module, "desegment",
|
|
"Reassemble SNMP-over-TCP messages spanning multiple TCP segments",
|
|
"Whether the SNMP dissector should reassemble messages spanning multiple TCP segments."
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&snmp_desegment);
|
|
|
|
prefs_register_bool_preference(snmp_module, "var_in_tree",
|
|
"Display dissected variables inside SNMP tree",
|
|
"ON - display dissected variables inside SNMP tree, OFF - display dissected variables in root tree after SNMP",
|
|
&snmp_var_in_tree);
|
|
|
|
prefs_register_uat_preference(snmp_module, "users_table",
|
|
"Users Table",
|
|
"Table of engine-user associations used for authentication and decryption",
|
|
assocs_uat);
|
|
|
|
prefs_register_uat_preference(snmp_module, "specific_traps_table",
|
|
"Enterprise Specific Trap Types",
|
|
"Table of enterprise specific-trap type descriptions",
|
|
specific_traps_uat);
|
|
|
|
#ifdef HAVE_LIBSMI
|
|
prefs_register_static_text_preference(snmp_module, "info_mibs",
|
|
"MIB settings can be changed in the Name Resolution preferences",
|
|
"MIB settings can be changed in the Name Resolution preferences");
|
|
#endif
|
|
|
|
value_sub_dissectors_table = register_dissector_table("snmp.variable_oid","SNMP Variable OID", proto_snmp, FT_STRING, BASE_NONE);
|
|
|
|
register_init_routine(init_ue_cache);
|
|
register_cleanup_routine(cleanup_ue_cache);
|
|
|
|
register_ber_syntax_dissector("SNMP", proto_snmp, dissect_snmp_tcp);
|
|
|
|
snmp_tap=register_tap("snmp");
|
|
|
|
register_srt_table(proto_snmp, NULL, 1, snmpstat_packet, snmpstat_init, NULL);
|
|
}
|
|
|
|
|
|
/*--- proto_reg_handoff_snmp ---------------------------------------*/
|
|
void proto_reg_handoff_snmp(void) {
|
|
dissector_handle_t snmp_tcp_handle;
|
|
|
|
dissector_add_uint_with_preference("udp.port", UDP_PORT_SNMP, snmp_handle);
|
|
dissector_add_uint("ethertype", ETHERTYPE_SNMP, snmp_handle);
|
|
dissector_add_uint("ipx.socket", IPX_SOCKET_SNMP_AGENT, snmp_handle);
|
|
dissector_add_uint("ipx.socket", IPX_SOCKET_SNMP_SINK, snmp_handle);
|
|
dissector_add_uint("hpext.dxsap", HPEXT_SNMP, snmp_handle);
|
|
|
|
snmp_tcp_handle = create_dissector_handle(dissect_snmp_tcp, proto_snmp);
|
|
dissector_add_uint_with_preference("tcp.port", TCP_PORT_SNMP, snmp_tcp_handle);
|
|
/* Since "regular" SNMP port and "trap" SNMP port use the same handler,
|
|
the "trap" port doesn't really need a separate preference. Just register
|
|
normally */
|
|
dissector_add_uint("tcp.port", TCP_PORT_SNMP_TRAP, snmp_tcp_handle);
|
|
dissector_add_uint("udp.port", UDP_PORT_SNMP_TRAP, snmp_handle);
|
|
dissector_add_uint("udp.port", UDP_PORT_SNMP_PATROL, snmp_handle);
|
|
|
|
data_handle = find_dissector("data");
|
|
|
|
/* SNMPv2-MIB sysDescr "1.3.6.1.2.1.1.1.0" */
|
|
dissector_add_string("snmp.variable_oid", "1.3.6.1.2.1.1.1.0",
|
|
create_dissector_handle(dissect_snmp_variable_string, proto_snmp));
|
|
/* SNMPv2-MIB::sysName.0 (1.3.6.1.2.1.1.5.0) */
|
|
dissector_add_string("snmp.variable_oid", "1.3.6.1.2.1.1.5.0",
|
|
create_dissector_handle(dissect_snmp_variable_string, proto_snmp));
|
|
|
|
/*
|
|
* Process preference settings.
|
|
*
|
|
* We can't do this in the register routine, as preferences aren't
|
|
* read until all dissector register routines have been called (so
|
|
* that all dissector preferences have been registered).
|
|
*/
|
|
process_prefs();
|
|
|
|
}
|
|
|
|
void
|
|
proto_register_smux(void)
|
|
{
|
|
static gint *ett[] = {
|
|
&ett_smux,
|
|
};
|
|
|
|
proto_smux = proto_register_protocol("SNMP Multiplex Protocol",
|
|
"SMUX", "smux");
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_smux(void)
|
|
{
|
|
dissector_handle_t smux_handle;
|
|
|
|
smux_handle = create_dissector_handle(dissect_smux, proto_smux);
|
|
dissector_add_uint_with_preference("tcp.port", TCP_PORT_SMUX, smux_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|