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  *  |                           Reserved                            |
  33  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  34  */
  35
  36 #define PTS_GET_AIK_SIZE                4
  37 #define PTS_GET_AIK_RESERVED    0x00000000
  38
  39 /**
  40  * Private data of an tcg_pts_attr_get_aik_t object.
  41  */
  42 struct private_tcg_pts_attr_get_aik_t {
  43
  44         /**
  45          * Public members of tcg_pts_attr_get_aik_t
  46          */
  47         tcg_pts_attr_get_aik_t public;
  48
  49         /**
  50          * Attribute vendor ID
  51          */
  52         pen_t vendor_id;
  53
  54         /**
  55          * Attribute type
  56          */
  57         u_int32_t type;
  58
  59         /**
  60          * Attribute value
  61          */
  62         chunk_t value;
  63
  64         /**
  65          * Noskip flag
  66          */
  67         bool noskip_flag;
  68 };
  69
  70 METHOD(pa_tnc_attr_t, get_vendor_id, pen_t,
  71         private_tcg_pts_attr_get_aik_t *this)
  72 {
  73         return this->vendor_id;
  74 }
  75
  76 METHOD(pa_tnc_attr_t, get_type, u_int32_t,
  77         private_tcg_pts_attr_get_aik_t *this)
  78 {
  79         return this->type;
  80 }
  81
  82 METHOD(pa_tnc_attr_t, get_value, chunk_t,
  83         private_tcg_pts_attr_get_aik_t *this)
  84 {
  85         return this->value;
  86 }
  87
  88 METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
  89         private_tcg_pts_attr_get_aik_t *this)
  90 {
  91         return this->noskip_flag;
  92 }
  93
  94 METHOD(pa_tnc_attr_t, set_noskip_flag,void,
  95         private_tcg_pts_attr_get_aik_t *this, bool noskip)
  96 {
  97         this->noskip_flag = noskip;
  98 }
  99
 100 METHOD(pa_tnc_attr_t, build, void,
 101         private_tcg_pts_attr_get_aik_t *this)
 102 {
 103         bio_writer_t *writer;
 104
 105         writer = bio_writer_create(PTS_GET_AIK_SIZE);
 106         writer->write_uint32 (writer, PTS_GET_AIK_RESERVED);
 107
 108         this->value = chunk_clone(writer->get_buf(writer));
 109         writer->destroy(writer);
 110 }
 111
 112 METHOD(pa_tnc_attr_t, process, status_t,
 113         private_tcg_pts_attr_get_aik_t *this, u_int32_t *offset)
 114 {
 115         bio_reader_t *reader;
 116         u_int32_t reserved;
 117
 118         if (this->value.len < PTS_GET_AIK_SIZE)
 119         {
 120                 DBG1(DBG_TNC, "insufficient data for Get AIK");
 121                 *offset = 0;
 122                 return FAILED;
 123         }
 124         reader = bio_reader_create(this->value);
 125         reader->read_uint32 (reader, &reserved);
 126         reader->destroy(reader);
 127
 128         return SUCCESS;
 129 }
 130
 131 METHOD(pa_tnc_attr_t, destroy, void,
 132         private_tcg_pts_attr_get_aik_t *this)
 133 {
 134         free(this->value.ptr);
 135         free(this);
 136 }
 137
 138 /**
 139  * Described in header.
 140  */
 141 pa_tnc_attr_t *tcg_pts_attr_get_aik_create()
 142 {
 143         private_tcg_pts_attr_get_aik_t *this;
 144
 145         INIT(this,
 146                 .public = {
 147                         .pa_tnc_attribute = {
 148                                 .get_vendor_id = _get_vendor_id,
 149                                 .get_type = _get_type,
 150                                 .get_value = _get_value,
 151                                 .get_noskip_flag = _get_noskip_flag,
 152                                 .set_noskip_flag = _set_noskip_flag,
 153                                 .build = _build,
 154                                 .process = _process,
 155                                 .destroy = _destroy,
 156                         },
 157                 },
 158                 .vendor_id = PEN_TCG,
 159                 .type = TCG_PTS_GET_AIK,
 160         );
 161
 162         return &this->public.pa_tnc_attribute;
 163 }
 164
 165
 166 /**
 167  * Described in header.
 168  */
 169 pa_tnc_attr_t *tcg_pts_attr_get_aik_create_from_data(chunk_t data)
 170 {
 171         private_tcg_pts_attr_get_aik_t *this;
 172
 173         INIT(this,
 174                 .public = {
 175                         .pa_tnc_attribute = {
 176                                 .get_vendor_id = _get_vendor_id,
 177                                 .get_type = _get_type,
 178                                 .get_value = _get_value,
 179                                 .get_noskip_flag = _get_noskip_flag,
 180                                 .set_noskip_flag = _set_noskip_flag,
 181                                 .build = _build,
 182                                 .process = _process,
 183                                 .destroy = _destroy,
 184                         },
 185                 },
 186                 .vendor_id = PEN_TCG,
 187                 .type = TCG_PTS_GET_AIK,
 188                 .value = chunk_clone(data),
 189         );
 190
 191         return &this->public.pa_tnc_attribute;
 192 }