/* packet-cmp.c * Routines for RFC2510 Certificate Management Protocol packet dissection * Ronnie Sahlberg 2004 * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #include "packet-ber.h" #include "packet-cmp.h" #include "packet-crmf.h" #include "packet-pkix1explicit.h" #include "packet-pkix1implicit.h" #include #include "packet-tcp.h" #include #include #define PNAME "Certificate Management Protocol" #define PSNAME "CMP" #define PFNAME "cmp" #define TCP_PORT_CMP 829 /* desegmentation of CMP over TCP */ static gboolean cmp_desegment = TRUE; /* Initialize the protocol and registered fields */ int proto_cmp = -1; static int hf_cmp_type_oid = -1; static int hf_cmp_rm = -1; static int hf_cmp_type = -1; static int hf_cmp_poll_ref = -1; static int hf_cmp_next_poll_ref = -1; static int hf_cmp_ttcb = -1; #include "packet-cmp-hf.c" /* Initialize the subtree pointers */ static gint ett_cmp = -1; #include "packet-cmp-ett.c" static const char *object_identifier_id; #include "packet-cmp-fn.c" static int dissect_cmp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { return dissect_cmp_PKIMessage(FALSE, tvb, 0, pinfo, tree, -1); } #define CMP_TYPE_PKIMSG 0 #define CMP_TYPE_POLLREP 1 #define CMP_TYPE_POLLREQ 2 #define CMP_TYPE_NEGPOLLREP 3 #define CMP_TYPE_PARTIALMSGREP 4 #define CMP_TYPE_FINALMSGREP 5 #define CMP_TYPE_ERRORMSGREP 6 static const value_string cmp_pdu_types[] = { { CMP_TYPE_PKIMSG, "pkiMsg" }, { CMP_TYPE_POLLREP, "pollRep" }, { CMP_TYPE_POLLREQ, "pollReq" }, { CMP_TYPE_NEGPOLLREP, "negPollRep" }, { CMP_TYPE_PARTIALMSGREP, "partialMsgRep" }, { CMP_TYPE_FINALMSGREP, "finalMsgRep" }, { CMP_TYPE_ERRORMSGREP, "errorMsgRep" }, { 0, NULL }, }; static void dissect_cmp_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree) { tvbuff_t *next_tvb; guint32 pdu_len; guint8 pdu_type; nstime_t ts; proto_item *item=NULL; proto_tree *tree=NULL; if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMP"); if (check_col(pinfo->cinfo, COL_INFO)) { col_clear(pinfo->cinfo, COL_INFO); col_add_fstr(pinfo->cinfo, COL_INFO, "PKIXCMP"); } if(parent_tree){ item=proto_tree_add_item(parent_tree, proto_cmp, tvb, 0, -1, FALSE); tree = proto_item_add_subtree(item, ett_cmp); } pdu_len=tvb_get_ntohl(tvb, 0); pdu_type=tvb_get_guint8(tvb, 4); proto_tree_add_uint(tree, hf_cmp_rm, tvb, 0, 4, pdu_len); proto_tree_add_uint(tree, hf_cmp_type, tvb, 4, 1, pdu_type); if (check_col (pinfo->cinfo, COL_INFO)) { col_set_str (pinfo->cinfo, COL_INFO, val_to_str (pdu_type, cmp_pdu_types, "0x%x")); } switch(pdu_type){ case CMP_TYPE_PKIMSG: next_tvb = tvb_new_subset(tvb, 5, tvb_length_remaining(tvb, 5), pdu_len); dissect_cmp_pdu(next_tvb, pinfo, tree); break; case CMP_TYPE_POLLREP: proto_tree_add_item(tree, hf_cmp_poll_ref, tvb, 0, 4, FALSE); ts.secs = tvb_get_ntohl(tvb, 4); ts.nsecs = 0; proto_tree_add_time(tree, hf_cmp_ttcb, tvb, 4, 4, &ts); break; case CMP_TYPE_POLLREQ: proto_tree_add_item(tree, hf_cmp_poll_ref, tvb, 0, 4, FALSE); break; case CMP_TYPE_NEGPOLLREP: break; case CMP_TYPE_PARTIALMSGREP: proto_tree_add_item(tree, hf_cmp_next_poll_ref, tvb, 0, 4, FALSE); ts.secs = tvb_get_ntohl(tvb, 4); ts.nsecs = 0; proto_tree_add_time(tree, hf_cmp_ttcb, tvb, 4, 4, &ts); next_tvb = tvb_new_subset(tvb, 13, tvb_length_remaining(tvb, 13), pdu_len); dissect_cmp_pdu(next_tvb, pinfo, tree); break; case CMP_TYPE_FINALMSGREP: next_tvb = tvb_new_subset(tvb, 5, tvb_length_remaining(tvb, 5), pdu_len); dissect_cmp_pdu(next_tvb, pinfo, tree); break; case CMP_TYPE_ERRORMSGREP: /*XXX to be added*/ break; } } static guint get_cmp_pdu_len(tvbuff_t *tvb, int offset) { guint32 plen; /* * Get the length of the CMP-over-TCP packet. */ plen = tvb_get_ntohl(tvb, offset); return plen+4; } /* CMP over TCP RFC2510 section 5.2 */ static int dissect_cmp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree) { guint32 pdu_len; guint8 pdu_type; /* only attempt to dissect it as CMP over TCP if we have * at least 5 bytes. */ if (!tvb_bytes_exist(tvb, 0, 5)) { return 0; } pdu_len=tvb_get_ntohl(tvb, 0); pdu_type=tvb_get_guint8(tvb, 4); /* arbitrary limit: assume a CMP over TCP pdu is never >10000 bytes * in size. * It is definitely at least 1 byte to accomodate the flags byte */ if((pdu_len<=0)||(pdu_len>10000)){ return 0; } /* type is between 0 and 6 */ if(pdu_type>6){ return 0; } /* type 0 contains a PKI message and must therefore be >= 3 bytes * long (flags + BER TAG + BER LENGTH */ if((pdu_type==0)&&(pdu_len<3)){ return 0; } tcp_dissect_pdus(tvb, pinfo, parent_tree, cmp_desegment, 4, get_cmp_pdu_len, dissect_cmp_tcp_pdu); return tvb_length(tvb); } static int dissect_cmp_http(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree) { proto_item *item=NULL; proto_tree *tree=NULL; if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMP"); if (check_col(pinfo->cinfo, COL_INFO)) { col_clear(pinfo->cinfo, COL_INFO); col_add_fstr(pinfo->cinfo, COL_INFO, "PKIXCMP"); } if(parent_tree){ item=proto_tree_add_item(parent_tree, proto_cmp, tvb, 0, -1, FALSE); tree = proto_item_add_subtree(item, ett_cmp); } return dissect_cmp_pdu(tvb, pinfo, tree); } /*--- proto_register_cmp ----------------------------------------------*/ void proto_register_cmp(void) { /* List of fields */ static hf_register_info hf[] = { { &hf_cmp_type_oid, { "InfoType", "cmp.type.oid", FT_STRING, BASE_NONE, NULL, 0, "Type of InfoTypeAndValue", HFILL }}, { &hf_cmp_rm, { "Record Marker", "cmp.rm", FT_UINT32, BASE_DEC, NULL, 0, "Record Marker length of PDU in bytes", HFILL }}, { &hf_cmp_type, { "Type", "cmp.type", FT_UINT8, BASE_DEC, VALS(cmp_pdu_types), 0, "PDU Type", HFILL }}, { &hf_cmp_poll_ref, { "Polling Reference", "cmp.poll_ref", FT_UINT32, BASE_HEX, NULL, 0, "", HFILL }}, { &hf_cmp_next_poll_ref, { "Next Polling Reference", "cmp.next_poll_ref", FT_UINT32, BASE_HEX, NULL, 0, "", HFILL }}, { &hf_cmp_ttcb, { "Time to check Back", "cmp.ttcb", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0, "", HFILL }}, #include "packet-cmp-hfarr.c" }; /* List of subtrees */ static gint *ett[] = { &ett_cmp, #include "packet-cmp-ettarr.c" }; module_t *cmp_module; /* Register protocol */ proto_cmp = proto_register_protocol(PNAME, PSNAME, PFNAME); /* Register fields and subtrees */ proto_register_field_array(proto_cmp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); cmp_module = prefs_register_protocol(proto_cmp, NULL); prefs_register_bool_preference(cmp_module, "desegment", "Reassemble CMP-over-TCP messages spanning multiple TCP segments", "Whether the CMP-over-TCP 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.", &cmp_desegment); } /*--- proto_reg_handoff_cmp -------------------------------------------*/ void proto_reg_handoff_cmp(void) { dissector_handle_t cmp_http_handle; dissector_handle_t cmp_tcp_handle; cmp_http_handle = new_create_dissector_handle(dissect_cmp_http, proto_cmp); dissector_add_string("media_type", "application/pkixcmp", cmp_http_handle); cmp_tcp_handle = new_create_dissector_handle(dissect_cmp_tcp, proto_cmp); dissector_add("tcp.port", TCP_PORT_CMP, cmp_tcp_handle); /*#include "packet-cmp-dis-tab.c"*/ }