src/libimcv/tcg/tcg_pts_attr_get_aik.c

   1 /*
   2  * Copyright (C) 2011 Sansar Choinyambuu
   3  * HSR Hochschule fuer Technik Rapperswil
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 #include "tcg_pts_attr_get_aik.h"
  17
  18 #include <pa_tnc/pa_tnc_msg.h>
  19 #include <bio/bio_writer.h>
  20 #include <bio/bio_reader.h>
  21 #include <debug.h>
  22
  23 typedef struct private_tcg_pts_attr_get_aik_t private_tcg_pts_attr_get_aik_t;
  24
  25 /**
  26  * Get Attestation Identity Key
  27  * see section 3.12 of PTS Protocol: Binding to TNC IF-M Specification
  28  *
  29  *                       1                   2                   3
  30  *   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
  31  *
  32  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  33  *  |                           Reserved                            |
  34  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  35  *
  36  */
  37
  38 #define PTS_GET_AIK_SIZE                4
  39 #define PTS_GET_AIK_RESERVED            0x00
  40
  41 /**
  42  * Private data of an tcg_pts_attr_get_aik_t object.
  43  */
  44 struct private_tcg_pts_attr_get_aik_t {
  45
  46         /**
  47          * Public members of tcg_pts_attr_get_aik_t
  48          */
  49         tcg_pts_attr_get_aik_t public;
  50
  51         /**
  52          * Attribute vendor ID
  53          */
  54         pen_t vendor_id;
  55
  56         /**
  57          * Attribute type
  58          */
  59         u_int32_t type;
  60
  61         /**
  62          * Attribute value
  63          */
  64         chunk_t value;
  65
  66         /**
  67          * Noskip flag
  68          */
  69         bool noskip_flag;
  70 };
  71
  72 METHOD(pa_tnc_attr_t, get_vendor_id, pen_t,
  73         private_tcg_pts_attr_get_aik_t *this)
  74 {
  75         return this->vendor_id;
  76 }
  77
  78 METHOD(pa_tnc_attr_t, get_type, u_int32_t,
  79         private_tcg_pts_attr_get_aik_t *this)
  80 {
  81         return this->type;
  82 }
  83
  84 METHOD(pa_tnc_attr_t, get_value, chunk_t,
  85         private_tcg_pts_attr_get_aik_t *this)
  86 {
  87         return this->value;
  88 }
  89
  90 METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
  91         private_tcg_pts_attr_get_aik_t *this)
  92 {
  93         return this->noskip_flag;
  94 }
  95
  96 METHOD(pa_tnc_attr_t, set_noskip_flag,void,
  97         private_tcg_pts_attr_get_aik_t *this, bool noskip)
  98 {
  99         this->noskip_flag = noskip;
 100 }
 101
 102 METHOD(pa_tnc_attr_t, build, void,
 103         private_tcg_pts_attr_get_aik_t *this)
 104 {
 105         bio_writer_t *writer;
 106
 107         writer = bio_writer_create(PTS_GET_AIK_SIZE);
 108         writer->write_uint32 (writer, PTS_GET_AIK_RESERVED);
 109
 110         this->value = chunk_clone(writer->get_buf(writer));
 111         writer->destroy(writer);
 112 }
 113
 114 METHOD(pa_tnc_attr_t, process, status_t,
 115         private_tcg_pts_attr_get_aik_t *this, u_int32_t *offset)
 116 {
 117         bio_reader_t *reader;
 118         u_int32_t reserved;
 119
 120         if (this->value.len < PTS_GET_AIK_SIZE)
 121         {
 122                 DBG1(DBG_TNC, "insufficient data for Get AIK");
 123                 *offset = 0;
 124                 return FAILED;
 125         }
 126         reader = bio_reader_create(this->value);
 127         reader->read_uint32 (reader, &reserved);
 128         reader->destroy(reader);
 129
 130         return SUCCESS;
 131 }
 132
 133 METHOD(pa_tnc_attr_t, destroy, void,
 134         private_tcg_pts_attr_get_aik_t *this)
 135 {
 136         free(this->value.ptr);
 137         free(this);
 138 }
 139
 140 /**
 141  * Described in header.
 142  */
 143 pa_tnc_attr_t *tcg_pts_attr_get_aik_create()
 144 {
 145         private_tcg_pts_attr_get_aik_t *this;
 146
 147         INIT(this,
 148                 .public = {
 149                         .pa_tnc_attribute = {
 150                                 .get_vendor_id = _get_vendor_id,
 151                                 .get_type = _get_type,
 152                                 .get_value = _get_value,
 153                                 .get_noskip_flag = _get_noskip_flag,
 154                                 .set_noskip_flag = _set_noskip_flag,
 155                                 .build = _build,
 156                                 .process = _process,
 157                                 .destroy = _destroy,
 158                         },
 159                 },
 160                 .vendor_id = PEN_TCG,
 161                 .type = TCG_PTS_GET_AIK,
 162         );
 163
 164         return &this->public.pa_tnc_attribute;
 165 }
 166
 167
 168 /**
 169  * Described in header.
 170  */
 171 pa_tnc_attr_t *tcg_pts_attr_get_aik_create_from_data(chunk_t data)
 172 {
 173         private_tcg_pts_attr_get_aik_t *this;
 174
 175         INIT(this,
 176                 .public = {
 177                         .pa_tnc_attribute = {
 178                                 .get_vendor_id = _get_vendor_id,
 179                                 .get_type = _get_type,
 180                                 .get_value = _get_value,
 181                                 .get_noskip_flag = _get_noskip_flag,
 182                                 .set_noskip_flag = _set_noskip_flag,
 183                                 .build = _build,
 184                                 .process = _process,
 185                                 .destroy = _destroy,
 186                         },
 187                 },
 188                 .vendor_id = PEN_TCG,
 189                 .type = TCG_PTS_GET_AIK,
 190                 .value = chunk_clone(data),
 191         );
 192
 193         return &this->public.pa_tnc_attribute;
 194 }