380 lines
9.5 KiB
C
380 lines
9.5 KiB
C
/*
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* Copyright (C) 2012-2014 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 "ietf_attr_remediation_instr.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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typedef struct private_ietf_attr_remediation_instr_t private_ietf_attr_remediation_instr_t;
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/**
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* PA-TNC Remediation Instructions type (see section 4.2.10 of RFC 5792)
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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 | Remediation Parameters Vendor ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Remediation Parameters Type |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Remediation Parameters (Variable Length) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define REMEDIATION_INSTR_MIN_SIZE 8
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#define REMEDIATION_INSTR_RESERVED 0x00
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/**
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* IETF Remediation Parameters URI type (see section 4.2.10.1 of RFC 5792)
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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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* | Remediation URI (Variable Length) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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* IETF Remediation Parameters String type (see section 4.2.10.2 of RFC 5792)
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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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* | Remediation String Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Remediation String (Variable Length) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Lang Code Len | Remediation String Lang Code (Variable Len) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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* Private data of an ietf_attr_remediation_instr_t object.
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*/
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struct private_ietf_attr_remediation_instr_t {
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/**
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* Public members of ietf_attr_remediation_instr_t
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*/
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ietf_attr_remediation_instr_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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* Length of attribute value
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*/
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size_t length;
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/**
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* Attribute value or segment
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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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* Remediation Parameters Type
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*/
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pen_type_t parameters_type;
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/**
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* Remediation Parameters
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*/
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chunk_t parameters;
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/**
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* Remediation String
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*/
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chunk_t string;
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/**
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* Remediation Language Code
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*/
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chunk_t lang_code;
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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_ietf_attr_remediation_instr_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_ietf_attr_remediation_instr_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_ietf_attr_remediation_instr_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_ietf_attr_remediation_instr_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_ietf_attr_remediation_instr_t *this)
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{
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bio_writer_t *writer;
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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(REMEDIATION_INSTR_MIN_SIZE);
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writer->write_uint8 (writer, REMEDIATION_INSTR_RESERVED);
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writer->write_uint24(writer, this->parameters_type.vendor_id);
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writer->write_uint32(writer, this->parameters_type.type);
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writer->write_data (writer, this->parameters);
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this->value = writer->extract_buf(writer);
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this->length = this->value.len;
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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_ietf_attr_remediation_instr_t *this, uint32_t *offset)
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{
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bio_reader_t *reader;
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uint8_t reserved;
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status_t status = SUCCESS;
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u_char *pos;
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*offset = 0;
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if (this->value.len < this->length)
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{
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return NEED_MORE;
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}
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if (this->value.len < REMEDIATION_INSTR_MIN_SIZE)
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{
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DBG1(DBG_TNC, "insufficient data for IETF remediation instructions");
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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, &reserved);
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reader->read_uint24(reader, &this->parameters_type.vendor_id);
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reader->read_uint32(reader, &this->parameters_type.type);
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reader->read_data (reader, reader->remaining(reader), &this->parameters);
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this->parameters = chunk_clone(this->parameters);
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reader->destroy(reader);
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if (this->parameters_type.vendor_id == PEN_IETF &&
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this->parameters_type.type == IETF_REMEDIATION_PARAMETERS_STRING)
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{
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reader = bio_reader_create(this->parameters);
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status = FAILED;
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*offset = 8;
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if (!reader->read_data32(reader, &this->string))
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{
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DBG1(DBG_TNC, "insufficient data for IETF remediation string");
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goto end;
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}
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*offset += 4;
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pos = memchr(this->string.ptr, '\0', this->string.len);
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if (pos)
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{
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DBG1(DBG_TNC, "nul termination in IETF remediation string");
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*offset += (pos - this->string.ptr);
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goto end;
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}
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*offset += this->string.len;
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if (!reader->read_data8(reader, &this->lang_code))
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{
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DBG1(DBG_TNC, "insufficient data for IETF remediation lang code");
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goto end;
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}
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status = SUCCESS;
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end:
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reader->destroy(reader);
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}
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return status;
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}
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METHOD(pa_tnc_attr_t, add_segment, void,
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private_ietf_attr_remediation_instr_t *this, chunk_t segment)
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{
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this->value = chunk_cat("mc", this->value, segment);
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}
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METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
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private_ietf_attr_remediation_instr_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_ietf_attr_remediation_instr_t *this)
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{
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if (ref_put(&this->ref))
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{
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free(this->parameters.ptr);
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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(ietf_attr_remediation_instr_t, get_parameters_type, pen_type_t,
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private_ietf_attr_remediation_instr_t *this)
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{
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return this->parameters_type;
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}
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METHOD(ietf_attr_remediation_instr_t, get_parameters, chunk_t,
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private_ietf_attr_remediation_instr_t *this)
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{
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return this->parameters;
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}
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METHOD(ietf_attr_remediation_instr_t, get_string, chunk_t,
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private_ietf_attr_remediation_instr_t *this, chunk_t *lang_code)
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{
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if (lang_code)
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{
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*lang_code = this->lang_code;
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}
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return this->string;
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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 *ietf_attr_remediation_instr_create(pen_type_t parameters_type,
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chunk_t parameters)
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{
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private_ietf_attr_remediation_instr_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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.add_segment = _add_segment,
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.get_ref = _get_ref,
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.destroy = _destroy,
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},
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.get_parameters_type = _get_parameters_type,
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.get_parameters = _get_parameters,
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.get_uri = _get_parameters,
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.get_string = _get_string,
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},
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.type = { PEN_IETF, IETF_ATTR_REMEDIATION_INSTRUCTIONS },
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.parameters_type = parameters_type,
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.parameters = chunk_clone(parameters),
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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 *ietf_attr_remediation_instr_create_from_uri(chunk_t uri)
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{
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pen_type_t type = { PEN_IETF, IETF_REMEDIATION_PARAMETERS_URI };
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return ietf_attr_remediation_instr_create(type, uri);
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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 *ietf_attr_remediation_instr_create_from_string(chunk_t string,
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chunk_t lang_code)
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{
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pa_tnc_attr_t *attr;
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bio_writer_t *writer;
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pen_type_t type = { PEN_IETF, IETF_REMEDIATION_PARAMETERS_STRING };
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/* limit language code to 255 octets */
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lang_code.len = min(255, lang_code.len);
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writer = bio_writer_create(4 + string.len + 1 + lang_code.len);
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writer->write_data32(writer, string);
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writer->write_data8 (writer, lang_code);
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attr = ietf_attr_remediation_instr_create(type, writer->get_buf(writer));
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writer->destroy(writer);
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return attr;
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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 *ietf_attr_remediation_instr_create_from_data(size_t length,
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chunk_t data)
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{
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private_ietf_attr_remediation_instr_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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.add_segment = _add_segment,
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.get_ref = _get_ref,
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.destroy = _destroy,
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},
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.get_parameters_type = _get_parameters_type,
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.get_parameters = _get_parameters,
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.get_uri = _get_parameters,
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.get_string = _get_string,
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},
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.type = { PEN_IETF, IETF_ATTR_REMEDIATION_INSTRUCTIONS },
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.length = length,
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.value = chunk_clone(data),
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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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