/* packet-opsi.c * Routines for OPSI protocol dissection * Copyright 2004, Laurent Rabret (France Telecom R&D) * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include #include #include #include "packet-tcp.h" void proto_register_opsi(void); void proto_reg_handoff_opsi(void); static dissector_handle_t opsi_handle; /* TCP destination port dedicated to the OPSI protocol */ #define TCP_PORT_OPSI 4002 /* Not IANA registered */ /* Information position in OPSI header */ #define MAJOR_VERSION_OFFSET 0 #define MINOR_VERSION_OFFSET 1 #define CODE_OFFSET 2 #define HOOK_ID_OFFSET 3 #define PACKET_LENGTH_OFFSET 4 #define SESSION_OFFSET 6 #define HEADER_LENGTH 8 /* Valid OPSI code values */ #define DISCOVER_REQUEST 1 #define DISCOVER_RESPONSE 2 #define SERVICE_REQUEST 3 #define SERVICE_ACCEPT 4 #define SERVICE_REJECT 5 #define TERMINATE_REQUEST 6 /* Internal structure to dissect attributes */ typedef struct { uint16_t attribute_type; /* attribute code */ const char *tree_text; /* text for fold out */ int *tree_id; /* id for add_item */ int *hf_type_attribute; /* id for search option */ void (*dissect)(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length); } opsi_attribute_handle_t; /* Attributes codes */ #define USER_NAME_ATTRIBUTE 1 #define USER_PASSWD_ATTRIBUTE 2 #define CHAP_PASSWD_ATTRIBUTE 3 #define NAS_IP_ADDRESS_ATTRIBUTE 4 #define NAS_PORT_ATTRIBUTE 5 #define SERVICE_TYPE_ATTRIBUTE 6 #define FRAMED_PROTOCOL_ATTRIBUTE 7 #define FRAMED_ADDRESS_ATTRIBUTE 8 #define FRAMED_NETMASK_ATTRIBUTE 9 #define FRAMED_ROUTING_ATTRIBUTE 10 #define FRAMED_FILTER_ATTRIBUTE 11 #define FRAMED_MTU_ATTRIBUTE 12 #define FRAMED_COMPRESSION_ATTRIBUTE 13 #define CALLED_STATION_ID_ATTRIBUTE 30 #define CALLING_STATION_ID_ATTRIBUTE 31 #define NAS_IDENTIFIER 32 #define ACCOUNTING_40_ATTRIBUTE 40 #define ACCOUNTING_41_ATTRIBUTE 41 #define ACCOUNTING_42_ATTRIBUTE 42 #define ACCOUNTING_43_ATTRIBUTE 43 #define ACCOUNTING_SESSION_ID_ATTRIBUTE 44 #define ACCOUNTING_45_ATTRIBUTE 45 #define ACCOUNTING_46_ATTRIBUTE 46 #define ACCOUNTING_47_ATTRIBUTE 47 #define ACCOUNTING_48_ATTRIBUTE 48 #define ACCOUNTING_49_ATTRIBUTE 49 #define ACCOUNTING_50_ATTRIBUTE 50 #define ACCOUNTING_51_ATTRIBUTE 51 #define ACCOUNTING_52_ATTRIBUTE 52 #define ACCOUNTING_53_ATTRIBUTE 53 #define ACCOUNTING_54_ATTRIBUTE 54 #define ACCOUNTING_55_ATTRIBUTE 55 #define ACCOUNTING_56_ATTRIBUTE 56 #define ACCOUNTING_57_ATTRIBUTE 57 #define ACCOUNTING_58_ATTRIBUTE 58 #define ACCOUNTING_59_ATTRIBUTE 59 #define CHAP_CHALLENGE_ATTRIBUTE 60 #define NAS_PORT_TYPE_ATTRIBUTE 61 #define DESIGNATION_NUMBER_ATTRIBUTE 77 #define NAS_PORT_ID_ATTRIBUTE 87 #define SMC_AAAID_ATTRIBUTE 651 #define SMC_VPNID_ATTRIBUTE 652 #define SMC_VPNNAME_ATTRIBUTE 653 #define SMC_RANID_ATTRIBUTE 654 #define SMC_RANIP_ATTRIBUTE 655 #define SMC_RANNAME_ATTRIBUTE 656 #define SMC_POPID_ATTRIBUTE 657 #define SMC_POPNAME_ATTRIBUTE 658 #define SMC_SMCID_ATTRIBUTE 659 #define SMC_RECEIVE_TIME_ATTRIBUTE 660 #define SMC_STAT_TIME_ATTRIBUTE 661 #define OPSI_FLAGS_ATTRIBUTE 674 #define OPSI_APPLICATION_NAME_ATTRIBUTE 675 /* * Published API functions. NOTE, "local" API functions * only valid from the packet-opsi file. */ static void decode_string_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length); static void decode_ipv4_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length); static void decode_longint_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length); static void decode_value_string_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length); static void decode_time_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length); /******* *******/ /* Initialize the protocol and registered fields */ static int proto_opsi; static int hf_opsi_major_version; static int hf_opsi_minor_version; static int hf_opsi_opcode; static int hf_opsi_hook_id; static int hf_opsi_length; static int hf_opsi_session_id; static int hf_user_name_att; static int hf_password_att; static int hf_chap_password_att; static int hf_nas_ip_add_att; static int hf_nas_port_att; static int hf_service_type_att; static int hf_framed_protocol_att; static int hf_framed_address_att; static int hf_framed_netmask_att; static int hf_framed_routing_att; static int hf_framed_filter_att; static int hf_framed_mtu_att; static int hf_framed_compression_att; static int hf_called_station_att; static int hf_calling_station_att; static int hf_nas_identifier_att; static int hf_accounting_att; static int hf_acct_session_id_att; static int hf_chap_challenge_att; static int hf_nas_port_type_att; static int hf_designation_num_att; static int hf_nas_port_id_att; static int hf_smc_aaa_id_att; static int hf_smc_vpn_id_att; static int hf_smc_vpn_name_att; static int hf_smc_ran_id_att; static int hf_smc_ran_ip_att; static int hf_smc_ran_name_att; static int hf_smc_pop_id_att; static int hf_smc_pop_name_att; static int hf_smc_id_att; static int hf_smc_receive_time_att; static int hf_smc_stat_time_att; static int hf_opsi_flags_att; static int hf_opsi_application_name_att; static int hf_opsi_attribute_length; /* Initialize the subtree pointers */ static int ett_opsi; static int ett_opsi_user_name; static int ett_opsi_user_password; static int ett_opsi_chap_password; static int ett_opsi_nas_ip_address; static int ett_opsi_nas_port; static int ett_opsi_service_type; static int ett_opsi_framed_protocol; static int ett_opsi_framed_address; static int ett_opsi_framed_netmask; static int ett_opsi_framed_routing; static int ett_opsi_framed_filter; static int ett_opsi_framed_mtu; static int ett_opsi_framed_compression; static int ett_opsi_called_station_id; static int ett_opsi_calling_station_id; static int ett_opsi_nas_identifier; static int ett_opsi_accounting; static int ett_opsi_acct_session_id; static int ett_opsi_chap_challenge; static int ett_opsi_nas_port_type; static int ett_opsi_designation_number; static int ett_opsi_nas_port_id; static int ett_opsi_smc_aaa_id; static int ett_opsi_smc_vpn_id; static int ett_opsi_smc_vpn_name; static int ett_opsi_smc_ran_id; static int ett_opsi_smc_ran_ip; static int ett_opsi_smc_ran_name; static int ett_opsi_smc_pop_id; static int ett_opsi_smc_pop_name; static int ett_opsi_smc_id; static int ett_opsi_smc_receive_time; static int ett_opsi_smc_stat_time; static int ett_opsi_flags; static int ett_opsi_application_name; static expert_field ei_opsi_unknown_attribute; static expert_field ei_opsi_short_attribute; static expert_field ei_opsi_short_frame; /* Code mapping */ static const value_string opsi_opcode[] = { { DISCOVER_REQUEST, "Discover Request" }, { DISCOVER_RESPONSE, "Discover Response" }, { SERVICE_REQUEST, "Service Request" }, { SERVICE_ACCEPT, "Service Accept" }, { SERVICE_REJECT, "Service Reject" }, { TERMINATE_REQUEST, "Terminate Request" }, { 0, NULL } }; static const value_string opsi_service_type_code[] = { { 1, "Login" }, { 2, "Framed" }, { 3, "Callback Login" }, { 4, "Callback Framed" }, { 5, "Outbound" }, { 6, "Administrative" }, { 7, "NAS Prompt" }, { 8, "Authenticate Only" }, { 9, "Callback NAS Prompt" }, { 0, NULL } }; static const value_string opsi_framed_protocol_code[] = { { 1, "PPP" }, { 2, "SLIP" }, { 3, "AppleTalk Remote Access Protocol (ARAP)" }, { 4, "Gandalf proprietary SingleLink/MultiLink protocol" }, { 5, "Xylogics proprietary IPX/SLIP" }, { 255, "Ascend ARA" }, { 256, "MPP" }, { 257, "EURAW" }, { 258, "EUUI" }, { 259, "X25" }, { 260, "COMB" }, { 261, "FR" }, { 262, "MP" }, { 263, "FR-CIR"}, { 0, NULL } }; static const value_string opsi_framed_routing_code[] = { { 0, "None" }, { 1, "Broadcast" }, { 2, "Listen" }, { 3, "Broadcast-Listen" }, { 4, "Broadcast V2" }, { 5, "Listen V2" }, { 6, "Broadcast-Listen V2" }, { 0, NULL }, }; static const value_string opsi_framed_compression_code[] = { { 0, "None" }, { 1, "Van Jacobsen TCP/IP" }, { 2, "IPX header compression" }, { 0, NULL } }; static const value_string opsi_nas_port_type_code[] = { { 0, "Async" }, { 1, "Sync" }, { 2, "ISDN Sync" }, { 3, "ISDN Async V.120" }, { 4, "ISDN Async V.110" }, { 5, "Virtual" }, { 6, "PIAFS" }, { 7, "HDLC Clear Channel" }, { 8, "X.25" }, { 9, "X.75" }, { 10, "G.3 Fax" }, { 11, "SDSL - Symmetric DSL" }, { 12, "ADSL-CAP - Asymmetric DSL, Carrierless Amplitude Phase Modulation" }, { 13, "ADSL-DMT - Asymmetric DSL, Discrete Multi-Tone" }, { 14, "IDSL - ISDN Digital Subscriber Line" }, { 15, "Ethernet" }, { 16, "xDSL - Digital Subscriber Line of unknown type" }, { 17, "Cable" }, { 18, "Wireless - Other" }, { 19, "Wireless - IEEE 802.11" }, { 201, "Voice over IP" }, { 0, NULL } }; /* Structure used to decode OPSI frame attributes */ /* CAUTION : it is compulsory to sort this array */ /* (first argument of the opsi_attribute_handle_t) */ /* in ascending order */ /* */ static opsi_attribute_handle_t opsi_attributes[] = { { USER_NAME_ATTRIBUTE, /* 1 */ "User name attribute", &ett_opsi_user_name, &hf_user_name_att, decode_string_attribute }, { USER_PASSWD_ATTRIBUTE, /* 2 */ "User password attribute" , &ett_opsi_user_password, &hf_password_att, decode_string_attribute }, { CHAP_PASSWD_ATTRIBUTE, /* 3 */ "CHAP password attribute", &ett_opsi_chap_password, &hf_chap_password_att, decode_string_attribute }, { NAS_IP_ADDRESS_ATTRIBUTE, /* 4 */ "NAS IP address attribute", &ett_opsi_nas_ip_address, &hf_nas_ip_add_att, decode_ipv4_attribute }, {NAS_PORT_ATTRIBUTE, /* 5 */ "NAS port attribute", &ett_opsi_nas_port, &hf_nas_port_att, decode_longint_attribute }, {SERVICE_TYPE_ATTRIBUTE, /* 6 */ "Service type attribute", &ett_opsi_service_type, &hf_service_type_att, decode_value_string_attribute }, {FRAMED_PROTOCOL_ATTRIBUTE, /* 7 */ "Framed protocol attribute", &ett_opsi_framed_protocol, &hf_framed_protocol_att, decode_value_string_attribute }, {FRAMED_ADDRESS_ATTRIBUTE, /* 8 */ "Framed address attribute", &ett_opsi_framed_address, &hf_framed_address_att, decode_ipv4_attribute }, {FRAMED_NETMASK_ATTRIBUTE, /* 9 */ "Framed netmask attribute", &ett_opsi_framed_netmask, &hf_framed_netmask_att, decode_ipv4_attribute }, {FRAMED_ROUTING_ATTRIBUTE, /* 10 */ "Framed routing attribute", &ett_opsi_framed_routing, &hf_framed_routing_att, decode_value_string_attribute }, {FRAMED_FILTER_ATTRIBUTE, /* 11 */ "Framed filter attribute", &ett_opsi_framed_filter, &hf_framed_filter_att, decode_string_attribute }, {FRAMED_MTU_ATTRIBUTE, /* 12 */ "Framed MTU attribute", &ett_opsi_framed_mtu, &hf_framed_mtu_att, decode_longint_attribute }, {FRAMED_COMPRESSION_ATTRIBUTE, /* 13 */ "Framed compression attribute", &ett_opsi_framed_compression, &hf_framed_compression_att, decode_value_string_attribute }, {CALLED_STATION_ID_ATTRIBUTE, /* 30 */ "Called station ID attribute", &ett_opsi_called_station_id, &hf_called_station_att, decode_string_attribute }, {CALLING_STATION_ID_ATTRIBUTE, /* 31 */ "Calling station ID attribute", &ett_opsi_calling_station_id, &hf_calling_station_att, decode_string_attribute }, {NAS_IDENTIFIER, /* 32 */ "NAS Identifier attribute", &ett_opsi_nas_identifier, &hf_nas_identifier_att, decode_string_attribute }, {ACCOUNTING_40_ATTRIBUTE, /* 40 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_41_ATTRIBUTE, /* 41 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_42_ATTRIBUTE, /* 42 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_43_ATTRIBUTE, /* 43 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_SESSION_ID_ATTRIBUTE, /* 44 */ "Accounting session ID attribute", &ett_opsi_acct_session_id, &hf_acct_session_id_att, decode_string_attribute }, {ACCOUNTING_45_ATTRIBUTE, /* 45 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_46_ATTRIBUTE, /* 46 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_47_ATTRIBUTE, /* 47 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_48_ATTRIBUTE, /* 48 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_49_ATTRIBUTE, /* 49 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_50_ATTRIBUTE, /* 50 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_51_ATTRIBUTE, /* 51 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_52_ATTRIBUTE, /* 52 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_53_ATTRIBUTE, /* 53 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_54_ATTRIBUTE, /* 54 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_55_ATTRIBUTE, /* 55 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_56_ATTRIBUTE, /* 56 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_57_ATTRIBUTE, /* 57 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_58_ATTRIBUTE, /* 58 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {ACCOUNTING_59_ATTRIBUTE, /* 59 */ "Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute }, {CHAP_CHALLENGE_ATTRIBUTE, /* 60 */ "CHAP challenge", &ett_opsi_chap_challenge, &hf_chap_challenge_att, decode_string_attribute }, {NAS_PORT_TYPE_ATTRIBUTE, /* 61 */ "NAS port type attribute", &ett_opsi_nas_port_type, &hf_nas_port_type_att, decode_value_string_attribute }, {DESIGNATION_NUMBER_ATTRIBUTE, /* 77 */ "Designation number attribute", &ett_opsi_designation_number, &hf_designation_num_att, decode_string_attribute }, {NAS_PORT_ID_ATTRIBUTE, /* 87 */ "NAS port ID attribute", &ett_opsi_nas_port_id, &hf_nas_port_id_att, decode_string_attribute }, {SMC_AAAID_ATTRIBUTE, /* 651 */ "SMC AAA ID attribute", &ett_opsi_smc_aaa_id, &hf_smc_aaa_id_att, decode_longint_attribute }, {SMC_VPNID_ATTRIBUTE, /* 652 */ "SMC VPN ID attribute", &ett_opsi_smc_vpn_id, &hf_smc_vpn_id_att, decode_longint_attribute }, {SMC_VPNNAME_ATTRIBUTE, /* 653 */ "SMC VPN name attribute", &ett_opsi_smc_vpn_name, &hf_smc_vpn_name_att, decode_string_attribute }, {SMC_RANID_ATTRIBUTE, /* 654 */ "SMC RAN ID attribute", &ett_opsi_smc_ran_id, &hf_smc_ran_id_att, decode_longint_attribute }, {SMC_RANIP_ATTRIBUTE, /* 655 */ "SMC RAN IP attribute", &ett_opsi_smc_ran_ip, &hf_smc_ran_ip_att, decode_ipv4_attribute }, {SMC_RANNAME_ATTRIBUTE, /* 656 */ "SMC RAN name attribute", &ett_opsi_smc_ran_name, &hf_smc_ran_name_att, decode_string_attribute }, {SMC_POPID_ATTRIBUTE, /* 657 */ "SMC POP ID attribute", &ett_opsi_smc_pop_id, &hf_smc_pop_id_att, decode_longint_attribute }, {SMC_POPNAME_ATTRIBUTE, /* 658 */ "SMC POP name attribute", &ett_opsi_smc_pop_name, &hf_smc_pop_name_att, decode_string_attribute }, {SMC_SMCID_ATTRIBUTE, /* 659 */ "SMC ID attribute", &ett_opsi_smc_id, &hf_smc_id_att, decode_longint_attribute }, {SMC_RECEIVE_TIME_ATTRIBUTE, /* 660 */ "SMC receive time attribute", &ett_opsi_smc_receive_time, &hf_smc_receive_time_att, decode_time_attribute }, {SMC_STAT_TIME_ATTRIBUTE, /* 661 */ "SMC stat time attribute", &ett_opsi_smc_stat_time, &hf_smc_stat_time_att, decode_longint_attribute }, {OPSI_FLAGS_ATTRIBUTE, /* 674 */ "OPSI flags attribute", &ett_opsi_flags, &hf_opsi_flags_att, decode_longint_attribute }, {OPSI_APPLICATION_NAME_ATTRIBUTE, /* 675 */ "OPSI application name attribute", &ett_opsi_application_name, &hf_opsi_application_name_att, decode_string_attribute }, }; #define OPSI_ATTRIBUTES_COUNT array_length(opsi_attributes) /* Desegmentation of OPSI (over TCP) */ static bool opsi_desegment = true; static void decode_string_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length) { if (length < 4) { expert_add_info(pinfo, item, &ei_opsi_short_attribute); return; } proto_tree_add_item(tree, *hfValue, tvb, offset+4, length-4, ENC_ASCII|ENC_NA); } static void decode_ipv4_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length) { if (length < 8) { expert_add_info(pinfo, item, &ei_opsi_short_attribute); return; } proto_tree_add_item(tree, *hfValue, tvb, offset+4, 4, ENC_BIG_ENDIAN); } static void decode_longint_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length) { if (length < 8) { expert_add_info(pinfo, item, &ei_opsi_short_attribute); return; } proto_tree_add_item(tree, *hfValue, tvb, offset+4, 4, ENC_BIG_ENDIAN); } static void decode_value_string_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length) { if (length < 8) { expert_add_info(pinfo, item, &ei_opsi_short_attribute); return; } proto_tree_add_item(tree, *hfValue, tvb, offset+4, 4, ENC_BIG_ENDIAN); } static void decode_time_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length) { if (length < 8) { expert_add_info(pinfo, item, &ei_opsi_short_attribute); return; } proto_tree_add_item(tree, *hfValue, tvb, offset+4, 4, ENC_TIME_SECS|ENC_BIG_ENDIAN); } /****************************************************************************/ /********** End of attribute decoding ***************************************/ /****************************************************************************/ /* To find the correct size of the PDU. Needed by the desegmentation feature*/ static unsigned get_opsi_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_) { /* * Get the length of the OPSI packet. * We are guaranteed there're enough chars in tvb in order to * extract the length value. No exception thrown !! */ return tvb_get_ntohs(tvb, offset + 4); } static int // NOLINTNEXTLINE(misc-no-recursion) get_opsi_attribute_index(packet_info *pinfo, int min, int max, int attribute_type) { int middle, at; middle = (min+max)/2; at = opsi_attributes[middle].attribute_type; if (at == attribute_type) return middle; int attr_idx; increment_dissection_depth(pinfo); if (attribute_type > at) { attr_idx = (middle == max) ? -1 : get_opsi_attribute_index(pinfo, middle+1, max, attribute_type); } else { attr_idx = (middle == min) ? -1 : get_opsi_attribute_index(pinfo, min, middle-1, attribute_type); } decrement_dissection_depth(pinfo); return attr_idx; } static void dissect_attributes(tvbuff_t *tvb, packet_info *pinfo, proto_tree *opsi_tree, int offset, int length) { int i; int attribute_type; int attribute_length; proto_item *ti; proto_tree *ntree = NULL; while (length >= 4) { attribute_type = tvb_get_ntohs(tvb, offset); attribute_length = tvb_get_ntohs(tvb, offset+2); if (attribute_length > length) break; /* We perform a standard log(n) lookup */ i = get_opsi_attribute_index(pinfo, 0, OPSI_ATTRIBUTES_COUNT-1, attribute_type); if (i == -1) { proto_tree_add_expert_format(opsi_tree, pinfo, &ei_opsi_unknown_attribute, tvb, offset, attribute_length, "Unknown attribute (%d)", attribute_type); } else { ntree = proto_tree_add_subtree_format(opsi_tree, tvb, offset, attribute_length, *opsi_attributes[i].tree_id, &ti, "%s (%d)", opsi_attributes[i].tree_text, attribute_type); proto_tree_add_item(ntree, hf_opsi_attribute_length, tvb, offset+2, 2, ENC_BIG_ENDIAN); opsi_attributes[i].dissect(tvb, pinfo, ntree, ti, opsi_attributes[i].hf_type_attribute, offset, attribute_length); } if (attribute_length < 4) { /* Length must be at least 4, for the type and length. */ break; } offset += attribute_length; length -= attribute_length; } if (length) { proto_tree_add_expert(opsi_tree, pinfo, &ei_opsi_short_frame, tvb, offset, -1); } } static int dissect_opsi_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { proto_item *ti; proto_tree *opsi_tree; col_set_str(pinfo->cinfo, COL_PROTOCOL, "OPSI"); col_clear(pinfo->cinfo, COL_INFO); col_append_sep_str(pinfo->cinfo, COL_INFO, ", ", val_to_str(tvb_get_uint8(tvb, CODE_OFFSET), opsi_opcode, "")); col_set_fence(pinfo->cinfo, COL_INFO); ti = proto_tree_add_item(tree, proto_opsi, tvb, 0, -1, ENC_NA); opsi_tree = proto_item_add_subtree(ti, ett_opsi); if (opsi_tree) { proto_tree_add_item(opsi_tree, hf_opsi_major_version, tvb, MAJOR_VERSION_OFFSET, 1, ENC_BIG_ENDIAN); proto_tree_add_item(opsi_tree, hf_opsi_minor_version, tvb, MINOR_VERSION_OFFSET, 1, ENC_BIG_ENDIAN); proto_tree_add_item(opsi_tree, hf_opsi_opcode, tvb, CODE_OFFSET, 1, ENC_BIG_ENDIAN); proto_tree_add_item(opsi_tree, hf_opsi_hook_id, tvb, HOOK_ID_OFFSET, 1, ENC_BIG_ENDIAN); proto_tree_add_item(opsi_tree, hf_opsi_length, tvb, PACKET_LENGTH_OFFSET, 2, ENC_BIG_ENDIAN); proto_tree_add_item(opsi_tree, hf_opsi_session_id, tvb, SESSION_OFFSET, 2, ENC_BIG_ENDIAN); } dissect_attributes(tvb, pinfo, opsi_tree, HEADER_LENGTH, MIN(((int)tvb_reported_length(tvb)-HEADER_LENGTH), (tvb_get_ntohs(tvb, PACKET_LENGTH_OFFSET)-HEADER_LENGTH))); return tvb_reported_length(tvb); } static int dissect_opsi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data) { /* We should minimally grab the header */ tcp_dissect_pdus(tvb, pinfo, tree, opsi_desegment, HEADER_LENGTH, get_opsi_pdu_len, dissect_opsi_pdu, data); return tvb_reported_length(tvb); } void proto_register_opsi(void) { /* Setup list of header fields See Section 1.6.1 for details*/ static hf_register_info hf[] = { { &hf_opsi_major_version, { "Major version", "opsi.major", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_opsi_minor_version, { "Minor version", "opsi.minor", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_opsi_opcode, { "Operation code", "opsi.opcode", FT_UINT8, BASE_DEC, VALS(opsi_opcode), 0x0, NULL, HFILL } }, { &hf_opsi_hook_id, { "Hook ID", "opsi.hook", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_opsi_length, { "Message length", "opsi.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_opsi_session_id, { "Session ID", "opsi.session_id", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_user_name_att, { "User name", "opsi.attr.user_name", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_password_att, { "User password", "opsi.attr.password", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_chap_password_att, { "CHAP password attribute", "opsi.attr.chap_password", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_nas_ip_add_att, { "NAS IP address", "opsi.attr.nas_ip_addr", FT_IPv4, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_nas_port_att, { "NAS port", "opsi.attr.nas_port", FT_UINT32, BASE_HEX, NULL, 0x00, NULL, HFILL } }, { &hf_service_type_att, { "Service type", "opsi.attr.service_type", FT_UINT32, BASE_DEC, VALS(opsi_service_type_code), 0x0, NULL, HFILL } }, { &hf_framed_protocol_att, { "Framed protocol", "opsi.attr.framed_protocol", FT_UINT32, BASE_DEC, VALS(opsi_framed_protocol_code), 0x0, NULL, HFILL } }, { &hf_framed_address_att, { "Framed address", "opsi.attr.framed_address", FT_IPv4, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_framed_netmask_att, { "Framed netmask", "opsi.attr.framed_netmask", FT_IPv4, BASE_NETMASK, NULL, 0x00, NULL, HFILL } }, { &hf_framed_routing_att, { "Framed routing", "opsi.attr.framed_routing", FT_UINT32, BASE_DEC, VALS(opsi_framed_routing_code), 0x0, NULL, HFILL } }, { &hf_framed_filter_att, { "Framed filter", "opsi.attr.framed_filter", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_framed_mtu_att, { "Framed MTU", "opsi.attr.framed_mtu", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } }, { &hf_framed_compression_att, { "Framed compression", "opsi.attr.framed_compression", FT_UINT32, BASE_DEC, VALS(opsi_framed_compression_code), 0x0, NULL, HFILL } }, { &hf_called_station_att, { "Called station ID", "opsi.attr.called_station_id", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_calling_station_att, { "Calling station ID", "opsi.attr.calling_station_id", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_nas_identifier_att, { "NAS ID", "opsi.attr.nas_id", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_accounting_att, { "Accounting", "opsi.attr.accounting", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_acct_session_id_att, { "Accounting session ID", "opsi.attr.acct.session_id", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_chap_challenge_att, { "CHAP challenge", "opsi.attr.chap_challenge", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_nas_port_type_att, { "NAS port type", "opsi.attr.nas_port_type", FT_UINT32, BASE_DEC, VALS(opsi_nas_port_type_code), 0x0, NULL, HFILL } }, { &hf_designation_num_att, { "Designation number", "opsi.attr.designation_number", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_nas_port_id_att, { "NAS port ID", "opsi.attr.nas_port_id", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_smc_aaa_id_att, { "SMC AAA ID", "opsi.attr.smc_aaa_id", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } }, { &hf_smc_vpn_id_att, { "SMC VPN ID", "opsi.attr.smc_vpn_id", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } }, { &hf_smc_vpn_name_att, { "SMC VPN name", "opsi.attr.smc_vpn_name", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_smc_ran_id_att, { "SMC RAN ID", "opsi.attr.smc_ran_id", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } }, { &hf_smc_ran_ip_att, { "SMC RAN IP address", "opsi.attr.smc_ran_ip", FT_IPv4, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_smc_ran_name_att, { "SMC RAN name", "opsi.attr.smc_ran_name", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_smc_pop_id_att, { "SMC POP id", "opsi.attr.smc_pop_id", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } }, { &hf_smc_pop_name_att, { "SMC POP name", "opsi.attr.smc_pop_name", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_smc_id_att, { "SMC ID", "opsi.attr.smc_id", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } }, { &hf_smc_receive_time_att, { "SMC receive time", "opsi.attr.smc_receive_time", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00, NULL, HFILL } }, { &hf_smc_stat_time_att, { "SMC stat time", "opsi.attr.smc_stat_time", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } }, { &hf_opsi_flags_att, { "OPSI flags", "opsi.attr.flags", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } }, { &hf_opsi_application_name_att, { "OPSI application name", "opsi.attr.application_name", FT_STRING, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_opsi_attribute_length, { "Length", "opsi.attr_length", FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL } }, }; /* Setup protocol subtree array */ static int *ett[] = { &ett_opsi, &ett_opsi_user_name, &ett_opsi_user_password, &ett_opsi_chap_password, &ett_opsi_nas_ip_address, &ett_opsi_nas_port, &ett_opsi_service_type, &ett_opsi_framed_protocol, &ett_opsi_framed_address, &ett_opsi_framed_netmask, &ett_opsi_framed_routing, &ett_opsi_framed_filter, &ett_opsi_framed_mtu, &ett_opsi_framed_compression, &ett_opsi_called_station_id, &ett_opsi_calling_station_id, &ett_opsi_nas_identifier, &ett_opsi_accounting, &ett_opsi_acct_session_id, &ett_opsi_chap_challenge, &ett_opsi_nas_port_type, &ett_opsi_designation_number, &ett_opsi_nas_port_id, &ett_opsi_smc_aaa_id, &ett_opsi_smc_vpn_id, &ett_opsi_smc_vpn_name, &ett_opsi_smc_ran_id, &ett_opsi_smc_ran_ip, &ett_opsi_smc_ran_name, &ett_opsi_smc_pop_id, &ett_opsi_smc_pop_name, &ett_opsi_smc_id, &ett_opsi_smc_receive_time, &ett_opsi_smc_stat_time, &ett_opsi_flags, &ett_opsi_application_name, }; static ei_register_info ei[] = { { &ei_opsi_unknown_attribute, { "opsi.attr_unknown", PI_PROTOCOL, PI_WARN, "Unknown attribute", EXPFILL }}, { &ei_opsi_short_attribute, { "opsi.attr_too_short", PI_MALFORMED, PI_WARN, "Too short attribute!", EXPFILL }}, { &ei_opsi_short_frame, { "opsi.short_frame", PI_MALFORMED, PI_WARN, "Short frame", EXPFILL }}, }; /* For desegmentation / reassembly */ module_t *opsi_module; expert_module_t* expert_opsi; /* Register the protocol name and description */ proto_opsi = proto_register_protocol("Open Policy Service Interface", "OPSI", "opsi"); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_opsi, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); expert_opsi = expert_register_protocol(proto_opsi); expert_register_field_array(expert_opsi, ei, array_length(ei)); /* We activate the desegmentation / reassembly feature */ opsi_module = prefs_register_protocol(proto_opsi, NULL); prefs_register_bool_preference(opsi_module, "desegment_opsi_messages", "Reassemble OPSI messages spanning multiple TCP segments", "Whether the OPSI dissector should desegment all messages spanning multiple TCP segments", &opsi_desegment); /* Register the dissector */ opsi_handle = register_dissector("opsi", dissect_opsi, proto_opsi); } void proto_reg_handoff_opsi(void) { dissector_add_uint_with_preference("tcp.port", TCP_PORT_OPSI, opsi_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: */