330 lines
7.7 KiB
C
330 lines
7.7 KiB
C
/*
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* Copyright (C) 2013 Andreas Steffen
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "tcg_swid_attr_req.h"
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#include "swid/swid_tag_id.h"
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#include <pa_tnc/pa_tnc_msg.h>
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#include <bio/bio_writer.h>
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#include <bio/bio_reader.h>
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#include <utils/debug.h>
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#include <collections/linked_list.h>
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typedef struct private_tcg_swid_attr_req_t private_tcg_swid_attr_req_t;
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/**
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* SWID Request
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* see section 4.7 of TCG TNC SWID Message and Attributes for IF-M
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*
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* 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Reserved |C|S|R| Tag ID Count |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Request ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Earliest EID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Tag Creator Length | Tag Creator (variable length) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Unique Software ID Length |Unique Software ID (var length)|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define SWID_REQ_SIZE 12
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#define SWID_REQ_RESERVED_MASK 0x03
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/**
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* Private data of an tcg_swid_attr_req_t object.
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*/
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struct private_tcg_swid_attr_req_t {
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/**
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* Public members of tcg_swid_attr_req_t
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*/
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tcg_swid_attr_req_t public;
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/**
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* Vendor-specific attribute type
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*/
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pen_type_t type;
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/**
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* Attribute value
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*/
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chunk_t value;
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/**
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* Noskip flag
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*/
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bool noskip_flag;
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/**
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* SWID request flags
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*/
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u_int8_t flags;
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/**
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* Request ID
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*/
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u_int32_t request_id;
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/**
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* Earliest EID
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*/
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u_int32_t earliest_eid;
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/**
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* List of Target Tag Identifiers
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*/
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swid_inventory_t *targets;
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/**
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* Reference count
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*/
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refcount_t ref;
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};
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METHOD(pa_tnc_attr_t, get_type, pen_type_t,
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private_tcg_swid_attr_req_t *this)
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{
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return this->type;
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}
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METHOD(pa_tnc_attr_t, get_value, chunk_t,
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private_tcg_swid_attr_req_t *this)
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{
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return this->value;
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}
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METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
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private_tcg_swid_attr_req_t *this)
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{
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return this->noskip_flag;
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}
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METHOD(pa_tnc_attr_t, set_noskip_flag,void,
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private_tcg_swid_attr_req_t *this, bool noskip)
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{
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this->noskip_flag = noskip;
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}
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METHOD(pa_tnc_attr_t, build, void,
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private_tcg_swid_attr_req_t *this)
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{
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bio_writer_t *writer;
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chunk_t tag_creator, unique_sw_id;
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swid_tag_id_t *tag_id;
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enumerator_t *enumerator;
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if (this->value.ptr)
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{
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return;
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}
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writer = bio_writer_create(SWID_REQ_SIZE);
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writer->write_uint8 (writer, this->flags);
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writer->write_uint24(writer, this->targets->get_count(this->targets));
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writer->write_uint32(writer, this->request_id);
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writer->write_uint32(writer, this->earliest_eid);
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enumerator = this->targets->create_enumerator(this->targets);
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while (enumerator->enumerate(enumerator, &tag_id))
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{
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tag_creator = tag_id->get_tag_creator(tag_id);
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unique_sw_id = tag_id->get_unique_sw_id(tag_id, NULL);
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writer->write_data16(writer, tag_creator);
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writer->write_data16(writer, unique_sw_id);
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}
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enumerator->destroy(enumerator);
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this->value = writer->extract_buf(writer);
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writer->destroy(writer);
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}
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METHOD(pa_tnc_attr_t, process, status_t,
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private_tcg_swid_attr_req_t *this, u_int32_t *offset)
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{
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bio_reader_t *reader;
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u_int32_t tag_id_count;
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chunk_t tag_creator, unique_sw_id;
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swid_tag_id_t *tag_id;
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if (this->value.len < SWID_REQ_SIZE)
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{
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DBG1(DBG_TNC, "insufficient data for SWID Request");
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*offset = 0;
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return FAILED;
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}
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reader = bio_reader_create(this->value);
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reader->read_uint8 (reader, &this->flags);
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reader->read_uint24(reader, &tag_id_count);
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reader->read_uint32(reader, &this->request_id);
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reader->read_uint32(reader, &this->earliest_eid);
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if (this->request_id == 0)
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{
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*offset = 4;
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return FAILED;
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}
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*offset = SWID_REQ_SIZE;
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this->flags &= SWID_REQ_RESERVED_MASK;
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while (tag_id_count--)
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{
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if (!reader->read_data16(reader, &tag_creator))
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{
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DBG1(DBG_TNC, "insufficient data for Tag Creator field");
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return FAILED;
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}
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*offset += 2 + tag_creator.len;
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if (!reader->read_data16(reader, &unique_sw_id))
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{
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DBG1(DBG_TNC, "insufficient data for Unique Software ID");
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return FAILED;
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}
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*offset += 2 + unique_sw_id.len;
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tag_id = swid_tag_id_create(tag_creator, unique_sw_id, chunk_empty);
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this->targets->add(this->targets, tag_id);
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}
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reader->destroy(reader);
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return SUCCESS;
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}
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METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
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private_tcg_swid_attr_req_t *this)
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{
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ref_get(&this->ref);
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return &this->public.pa_tnc_attribute;
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}
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METHOD(pa_tnc_attr_t, destroy, void,
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private_tcg_swid_attr_req_t *this)
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{
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if (ref_put(&this->ref))
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{
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this->targets->destroy(this->targets);
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free(this->value.ptr);
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free(this);
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}
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}
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METHOD(tcg_swid_attr_req_t, get_flags, u_int8_t,
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private_tcg_swid_attr_req_t *this)
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{
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return this->flags;
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}
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METHOD(tcg_swid_attr_req_t, get_request_id, u_int32_t,
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private_tcg_swid_attr_req_t *this)
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{
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return this->request_id;
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}
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METHOD(tcg_swid_attr_req_t, get_earliest_eid, u_int32_t,
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private_tcg_swid_attr_req_t *this)
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{
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return this->earliest_eid;
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}
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METHOD(tcg_swid_attr_req_t, add_target, void,
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private_tcg_swid_attr_req_t *this, swid_tag_id_t *tag_id)
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{
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this->targets->add(this->targets, tag_id);
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}
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METHOD(tcg_swid_attr_req_t, get_targets, swid_inventory_t*,
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private_tcg_swid_attr_req_t *this)
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{
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return this->targets;
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}
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/**
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* Described in header.
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*/
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pa_tnc_attr_t *tcg_swid_attr_req_create(u_int8_t flags, u_int32_t request_id,
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u_int32_t eid)
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{
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private_tcg_swid_attr_req_t *this;
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INIT(this,
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.public = {
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.pa_tnc_attribute = {
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.get_type = _get_type,
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.get_value = _get_value,
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.get_noskip_flag = _get_noskip_flag,
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.set_noskip_flag = _set_noskip_flag,
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.build = _build,
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.process = _process,
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.get_ref = _get_ref,
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.destroy = _destroy,
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},
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.get_flags = _get_flags,
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.get_request_id = _get_request_id,
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.get_earliest_eid = _get_earliest_eid,
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.add_target = _add_target,
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.get_targets = _get_targets,
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},
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.type = { PEN_TCG, TCG_SWID_REQUEST },
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.flags = flags & SWID_REQ_RESERVED_MASK,
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.request_id = request_id,
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.earliest_eid = eid,
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.targets = swid_inventory_create(FALSE),
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.ref = 1,
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);
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return &this->public.pa_tnc_attribute;
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}
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/**
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* Described in header.
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*/
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pa_tnc_attr_t *tcg_swid_attr_req_create_from_data(chunk_t data)
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{
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private_tcg_swid_attr_req_t *this;
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INIT(this,
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.public = {
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.pa_tnc_attribute = {
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.get_type = _get_type,
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.get_value = _get_value,
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.get_noskip_flag = _get_noskip_flag,
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.set_noskip_flag = _set_noskip_flag,
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.build = _build,
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.process = _process,
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.get_ref = _get_ref,
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.destroy = _destroy,
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},
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.get_flags = _get_flags,
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.get_request_id = _get_request_id,
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.get_earliest_eid = _get_earliest_eid,
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.add_target = _add_target,
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.get_targets = _get_targets,
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},
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.type = { PEN_TCG, TCG_SWID_REQUEST },
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.value = chunk_clone(data),
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.targets = swid_inventory_create(FALSE),
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.ref = 1,
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);
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return &this->public.pa_tnc_attribute;
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}
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