Re: payload_proto_id in SCPT dissector

[Anders Broman <anders.broman () ericsson com>]

Hi,

It is the SCTP PPI which is defined by IANA

Payload protocol identifier: M3UA (3)

    { &hf_data_chunk_payload_proto_id,              { "Payload protocol 
identifier",                    "sctp.data_payload_proto_id", 
FT_UINT32,  BASE_DEC,  VALS(sctp_payload_proto_id_values),             0x0, 
NULL, HFILL } },



You find it in sctpppids.h and

static const value_string sctp_payload_proto_id_values[] = {

  { NOT_SPECIFIED_PROTOCOL_ID,                      "not specified" },

  { IUA_PAYLOAD_PROTOCOL_ID,                        "IUA" },

  { M2UA_PAYLOAD_PROTOCOL_ID,                       "M2UA" },

  { M3UA_PAYLOAD_PROTOCOL_ID,                       "M3UA" },

  { SUA_PAYLOAD_PROTOCOL_ID,                        "SUA" },

  { M2PA_PAYLOAD_PROTOCOL_ID,                       "M2PA" },

  { V5UA_PAYLOAD_PROTOCOL_ID,                       "V5UA" },

  { H248_PAYLOAD_PROTOCOL_ID,                       "H.248/MEGACO" },

  { BICC_PAYLOAD_PROTOCOL_ID,                       "BICC/Q.2150.3" },

  { TALI_PAYLOAD_PROTOCOL_ID,                       "TALI" },

  { DUA_PAYLOAD_PROTOCOL_ID,                        "DUA" },

  { ASAP_PAYLOAD_PROTOCOL_ID,                       "ASAP" },

  { ENRP_PAYLOAD_PROTOCOL_ID,                       "ENRP" },

  { H323_PAYLOAD_PROTOCOL_ID,                       "H.323" },

  { QIPC_PAYLOAD_PROTOCOL_ID,                       "Q.IPC/Q.2150.3" },

  { SIMCO_PAYLOAD_PROTOCOL_ID,                      "SIMCO" },

  { DDP_SEG_CHUNK_PROTOCOL_ID,                      "DDP Segment Chunk" },

  { DDP_STREAM_SES_CTRL_PROTOCOL_ID,                "DDP Stream Session 
Control" },

  { S1AP_PAYLOAD_PROTOCOL_ID,                       "S1 Application Protocol 
(S1AP)" },

  { RUA_PAYLOAD_PROTOCOL_ID,                        "RUA" },

  { HNBAP_PAYLOAD_PROTOCOL_ID,                      "HNBAP" },

  { FORCES_HP_PAYLOAD_PROTOCOL_ID,                  "ForCES-HP" },

  { FORCES_MP_PAYLOAD_PROTOCOL_ID,                  "ForCES-MP" },

  { FORCES_LP_PAYLOAD_PROTOCOL_ID,                  "ForCES-LP" },

  { SBC_AP_PAYLOAD_PROTOCOL_ID,                     "SBc-AP" },

  { NBAP_PAYLOAD_PROTOCOL_ID,                       "NBAP" },

  /* Unassigned 26 */

  { X2AP_PAYLOAD_PROTOCOL_ID,                       "X2AP" },

  { IRCP_PAYLOAD_PROTOCOL_ID,                       "IRCP" },

  { LCS_AP_PAYLOAD_PROTOCOL_ID,                     "LCS-AP" },

  { MPICH2_PAYLOAD_PROTOCOL_ID,                     "MPICH2" },

  { SABP_PAYLOAD_PROTOCOL_ID,                       "SABP" },

  { FGP_PAYLOAD_PROTOCOL_ID,                        "Fractal Generator 
Protocol" },

  { PPP_PAYLOAD_PROTOCOL_ID,                        "Ping Pong Protocol" },

  { CALCAPP_PAYLOAD_PROTOCOL_ID,                    "CalcApp Protocol" },

  { SSP_PAYLOAD_PROTOCOL_ID,                        "Scripting Service 
Protocol" },

  { NPMP_CTRL_PAYLOAD_PROTOCOL_ID,                  "NetPerfMeter Control" },

  { NPMP_DATA_PAYLOAD_PROTOCOL_ID,                  "NetPerfMeter Data" },

  { ECHO_PAYLOAD_PROTOCOL_ID,                       "Echo" },

  { DISCARD_PAYLOAD_PROTOCOL_ID,                    "Discard" },

  { DAYTIME_PAYLOAD_PROTOCOL_ID,                    "Daytime" },

  { CHARGEN_PAYLOAD_PROTOCOL_ID,                    "Character Generator" },

  { PROTO_3GPP_RNA_PROTOCOL_ID,                     "3GPP RNA" },

  { PROTO_3GPP_M2AP_PROTOCOL_ID,                    "3GPP M2AP" },

  { PROTO_3GPP_M3AP_PROTOCOL_ID,                    "3GPP M3AP" },

  { SSH_PAYLOAD_PROTOCOL_ID,                        "SSH" },

  { DIAMETER_PROTOCOL_ID,                           "DIAMETER" },

  { DIAMETER_DTLS_PROTOCOL_ID,                      "DIAMETER OVER DTLS" },

  { R14P_BER_PROTOCOL_ID,                           "R14P" },

  { WEBRTC_DCEP_PROTOCOL_ID,                        "WebRTC Control" },

  { WEBRTC_STRING_PAYLOAD_PROTOCOL_ID,              "WebRTC String" },

  { WEBRTC_BINARY_PARTIAL_PAYLOAD_PROTOCOL_ID,      "WebRTC Binary Partial 
(Deprecated)" },

  { WEBRTC_BINARY_PAYLOAD_PROTOCOL_ID,              "WebRTC Binary" },

  { WEBRTC_STRING_PARTIAL_PAYLOAD_PROTOCOL_ID,      "WebRTC String Partial 
(Deprecated)" },

  { PROTO_3GPP_PUA_PAYLOAD_PROTOCOL_ID,             "3GPP PUA" },

  { WEBRTC_STRING_EMPTY_PAYLOAD_PROTOCOL_ID,        "WebRTC String Empty" },

  { WEBRTC_BINARY_EMPTY_PAYLOAD_PROTOCOL_ID,        "WebRTC Binary Empty" },

  { XWAP_PROTOCOL_ID,                               "XwAP" },

  { XW_CONTROL_PLANE_PROTOCOL_ID,                   "Xw - Control Plane" },

  { NGAP_PROTOCOL_ID,                               "NGAP" },

  { XNAP_PROTOCOL_ID,                               "XnAP" },

  { F1AP_PROTOCOL_ID,                               "F1 AP" },

  { ELE2_PROTOCOL_ID,                               "ELE2 Lawful 
Interception" },



  { 0,                                              NULL } };





Regards

Anders

From: Wireshark-dev <wireshark-dev-bounces () wireshark org> On Behalf Of Dario 
Lombardo
Sent: den 15 augusti 2019 13:55
To: Developer support list for Wireshark <wireshark-dev () wireshark org>
Subject: [Wireshark-dev] payload_proto_id in SCPT dissector



Hi,

I'm working on fixing a bug reported by oss-fuzz, and I got stuck. The payload 
is TLS over SCPT.

In the sctp dissector the variable payload_proto_id is read from the tlv in 
dissect_data_chunk. What is it supposed to contain? Which proto_id?

Following the stack trace, this value is passed to dissect_tls as-is. That 
function handles the value as it was a char* containing the name of the 
dissector to find (indeed it is passed to find_dissector).

I can't figure out how this is supposed to work in the first place, or I am 
missing some piece of the puzzle.

Any help?




-- 

Naima is online.

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