common/net_nfc_util_sign_record.c

   1 /*
   2  * Copyright (c) 2012, 2013 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Flora License, Version 1.1 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://floralicense.org/license/
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17
  18 #include <sys/param.h>
  19
  20 #include "net_nfc_debug_internal.h"
  21 #include "net_nfc_util_defines.h"
  22 #include "net_nfc_util_internal.h"
  23 #include "net_nfc_util_ndef_message.h"
  24 #include "net_nfc_util_ndef_record.h"
  25 #include "net_nfc_util_openssl_internal.h"
  26 #include "net_nfc_util_sign_record.h"
  27
  28 #define IS_SIGN_RECORD(__x) \
  29         (((__x)->TNF == NET_NFC_RECORD_WELL_KNOWN_TYPE) && \
  30          ((__x)->type_s.length == 3) && \
  31          (memcmp((__x)->type_s.buffer, "Sig", 3) == 0))
  32
  33 #define IS_EMPTY_RECORD(__x) \
  34         ((__x->TNF == NET_NFC_RECORD_EMPTY))
  35
  36 #define __FILL_SUB_FIELD(__dst, __buf, __len) \
  37         (__dst)->length = (__len); \
  38         memcpy((__dst)->value, (__buf), (__dst)->length);
  39
  40 #define __NEXT_SUB_FIELD(__dst) ((__dst)->value + (__dst)->length)
  41
  42 bool _get_records_data_buffer(ndef_record_s *begin_record, ndef_record_s *end_record, uint8_t **buffer, uint32_t *length)
  43 {
  44         bool result = false;
  45         uint32_t len = 0;
  46         ndef_record_s *current_record = NULL;
  47
  48         if (begin_record == NULL || begin_record == end_record)
  49                 return result;
  50
  51         /* count total buffer length */
  52         current_record = begin_record;
  53         len = 0;
  54
  55         while (current_record != NULL && current_record != end_record)
  56         {
  57                 /* type length */
  58                 if (current_record->type_s.buffer != NULL && current_record->type_s.length > 0)
  59                         len += current_record->type_s.length;
  60
  61                 /* ID length */
  62                 if (current_record->id_s.buffer != NULL && current_record->id_s.length > 0)
  63                         len += current_record->id_s.length;
  64
  65                 /* payload length */
  66                 if (current_record->payload_s.buffer != NULL && current_record->payload_s.length > 0)
  67                         len += current_record->payload_s.length;
  68
  69                 current_record = current_record->next;
  70         }
  71
  72         if (len > 0)
  73         {
  74                 uint8_t *buf = NULL;
  75
  76                 _net_nfc_util_alloc_mem(buf, len);
  77                 if (buf != NULL)
  78                 {
  79                         uint32_t offset = 0;
  80
  81                         current_record = begin_record;
  82
  83                         while (offset < len && current_record != NULL && current_record != end_record)
  84                         {
  85                                 /* type length */
  86                                 if (current_record->type_s.buffer != NULL && current_record->type_s.length > 0)
  87                                 {
  88                                         memcpy(buf + offset, current_record->type_s.buffer, MIN(current_record->type_s.length, len - offset));
  89                                         offset += MIN(current_record->type_s.length, len - offset);
  90                                 }
  91
  92                                 /* ID length */
  93                                 if (current_record->id_s.buffer != NULL && current_record->id_s.length > 0)
  94                                 {
  95                                         memcpy(buf + offset, current_record->id_s.buffer, MIN(current_record->id_s.length, len - offset));
  96                                         offset += MIN(current_record->id_s.length, len - offset);
  97                                 }
  98
  99                                 /* payload length */
 100                                 if (current_record->payload_s.buffer != NULL && current_record->payload_s.length > 0)
 101                                 {
 102                                         memcpy(buf + offset, current_record->payload_s.buffer, MIN(current_record->payload_s.length, len - offset));
 103                                         offset += MIN(current_record->payload_s.length, len - offset);
 104                                 }
 105
 106                                 current_record = current_record->next;
 107                         }
 108
 109                         *buffer = buf;
 110                         *length = offset;
 111
 112                         result = true;
 113                 }
 114         }
 115
 116         return result;
 117 }
 118
 119 net_nfc_error_e net_nfc_util_verify_signature_records(ndef_record_s *begin_record, ndef_record_s *sign_record)
 120 {
 121         net_nfc_error_e result = NET_NFC_UNKNOWN_ERROR;
 122         uint8_t *buffer = NULL;
 123         uint32_t length = 0;
 124
 125         if (begin_record == NULL || sign_record == NULL || begin_record == sign_record)
 126                 return NET_NFC_INVALID_PARAM;
 127
 128         /* get signed data */
 129         if (_get_records_data_buffer(begin_record, sign_record, &buffer, &length) == true)
 130         {
 131                 net_nfc_signature_record_s *sign_info = NULL;
 132                 net_nfc_certificate_chain_s *chain_info = NULL;
 133
 134                 /* parse signature info */
 135                 sign_info = (net_nfc_signature_record_s *)sign_record->payload_s.buffer;
 136
 137                 DEBUG_MSG("record version : %d", sign_info->version);
 138                 DEBUG_MSG("signature URI present? : %s", sign_info->uri_present ? "true" : "false");
 139                 DEBUG_MSG("signature type : %d", sign_info->sign_type);
 140                 DEBUG_MSG("signature length : %d", sign_info->signature.length);
 141
 142                 if (sign_info->uri_present == true)
 143                 {
 144                         /* TODO */
 145                         /* receive the signature data directed by uri */
 146                         DEBUG_ERR_MSG("NOT IMPLEMENTED (sign_info->uri_present == true)");
 147                         _net_nfc_util_free_mem(buffer);
 148                         return result;
 149                 }
 150
 151                 /* parse certificate chain info */
 152                 chain_info = (net_nfc_certificate_chain_s *)__NEXT_SUB_FIELD(&(sign_info->signature));
 153
 154                 SECURE_LOGD("certificate URI present? : %s", chain_info->uri_present ? "true" : "false");
 155                 DEBUG_MSG("certificate format : %d", chain_info->cert_format);
 156                 DEBUG_MSG("number of certificates : %d", chain_info->num_of_certs);
 157
 158                 if (chain_info->num_of_certs > 0)
 159                 {
 160                         net_nfc_sub_field_s *data_info = NULL;
 161
 162                         data_info = (net_nfc_sub_field_s *)chain_info->cert_store;
 163                         DEBUG_MSG("certficate length : %d", data_info->length);
 164
 165                         //              DEBUG_MSG_PRINT_BUFFER(data_info->value, data_info->length);
 166
 167                         /* the first certificate is signer's one
 168                          * verify signature of content */
 169                         if (net_nfc_util_openssl_verify_signature(sign_info->sign_type, buffer, length, data_info->value, data_info->length, sign_info->signature.value, sign_info->signature.length) == true)
 170                         {
 171                                 if (chain_info->num_of_certs > 1)
 172                                 {
 173                                         int32_t i = 0;
 174                                         net_nfc_openssl_verify_context_h context = NULL;
 175
 176                                         /* initialize context of verifying certificate */
 177                                         context = net_nfc_util_openssl_init_verify_certificate();
 178
 179                                         /* add signer's certificate */
 180                                         net_nfc_util_openssl_add_certificate_of_signer(context, data_info->value, data_info->length);
 181
 182                                         /* verify certificate using certificate chain */
 183                                         for (i = 1, data_info = (net_nfc_sub_field_s *)__NEXT_SUB_FIELD(data_info);
 184                                                         i < chain_info->num_of_certs;
 185                                                         i++, data_info = (net_nfc_sub_field_s *)__NEXT_SUB_FIELD(data_info))
 186                                         {
 187                                                 DEBUG_MSG("certficate length : %d", data_info->length);
 188                                                 //DEBUG_MSG_PRINT_BUFFER(data_info->value, data_info->length);
 189
 190                                                 net_nfc_util_openssl_add_certificate_of_ca(context, data_info->value, data_info->length);
 191                                         }
 192
 193                                         /* if the CA_Uri is present, continue adding certificate from uri */
 194                                         if (chain_info->uri_present == true)
 195                                         {
 196                                                 /* TODO : Need to implement */
 197                                                 DEBUG_ERR_MSG("NOT IMPLEMENTED (found_root == false && chain_info->uri_present == true)");
 198                                                 net_nfc_util_openssl_release_verify_certificate(context);
 199                                                 _net_nfc_util_free_mem(buffer);
 200                                                 return result;
 201
 202                                                 //DEBUG_MSG("certficate length : %d", data_info->length);
 203                                                 //DEBUG_MSG_PRINT_BUFFER(data_info->value, data_info->length);
 204                                         }
 205
 206                                         /* verify buffer with cert chain and signature bytes */
 207                                         if (net_nfc_util_openssl_verify_certificate(context) == true)
 208                                                 result = NET_NFC_OK;
 209
 210                                         net_nfc_util_openssl_release_verify_certificate(context);
 211                                 }
 212                                 else
 213                                 {
 214                                         /* TODO : test certificate??? */
 215                                         result = NET_NFC_OK;
 216                                 }
 217
 218                                 DEBUG_MSG("verifying signature %d", result);
 219                         }
 220                         else
 221                         {
 222                                 DEBUG_ERR_MSG("verifying signature failed");
 223                         }
 224                 }
 225                 else
 226                 {
 227                         DEBUG_ERR_MSG("certificate not found");
 228                 }
 229
 230                 _net_nfc_util_free_mem(buffer);
 231         }
 232         else
 233         {
 234                 if(buffer != NULL)
 235                 {
 236                         _net_nfc_util_free_mem(buffer);
 237                 }
 238                 DEBUG_ERR_MSG("_get_records_data_buffer failed");
 239         }
 240
 241         return result;
 242 }
 243
 244 net_nfc_error_e net_nfc_util_verify_signature_ndef_message(ndef_message_s *msg)
 245 {
 246         net_nfc_error_e result = NET_NFC_UNKNOWN_ERROR;
 247         ndef_record_s *begin_record = NULL;
 248         ndef_record_s *current_record = NULL;
 249
 250         begin_record = msg->records;
 251         current_record = msg->records;
 252
 253         while (current_record != NULL)
 254         {
 255                 if (begin_record == NULL)
 256                 {
 257                         begin_record = current_record;
 258                 }
 259
 260                 if (IS_EMPTY_RECORD(current_record))
 261                 {
 262                         begin_record = NULL;
 263                 }
 264                 else if (IS_SIGN_RECORD(current_record))
 265                 {
 266                         result = net_nfc_util_verify_signature_records(begin_record, current_record);
 267
 268                         begin_record = NULL;
 269                 }
 270
 271                 current_record = current_record->next;
 272         }
 273
 274         return result;
 275 }
 276
 277 /*
 278  * sign method
 279  */
 280 net_nfc_error_e net_nfc_util_sign_records(ndef_message_s *msg, int begin_index, int end_index, char *cert_file, char *password)
 281 {
 282         net_nfc_error_e result = NET_NFC_UNKNOWN_ERROR;
 283         ndef_record_s *begin_record = NULL, *end_record = NULL, *record = NULL;
 284         data_s payload = { NULL, 0 };
 285         uint8_t *data_buffer = NULL;
 286         uint32_t data_len = 0;
 287         uint8_t signature[1024] = { 0, };
 288         uint32_t sign_len = sizeof(signature);
 289         uint8_t *cert_buffer = NULL;
 290         uint32_t cert_len = 0;
 291         uint32_t cert_count = 0;
 292
 293         net_nfc_util_get_record_by_index(msg, begin_index, &begin_record);
 294         net_nfc_util_get_record_by_index(msg, end_index, &end_record);
 295
 296         DEBUG_MSG("total record count : %d, begin_index : %d, end_index : %d", msg->recordCount, begin_index, end_index);
 297
 298         /* get target data */
 299         _get_records_data_buffer(begin_record, end_record->next, &data_buffer, &data_len);
 300
 301         DEBUG_MSG_PRINT_BUFFER(data_buffer, data_len);
 302
 303         net_nfc_util_openssl_sign_buffer(NET_NFC_SIGN_TYPE_PKCS_1, data_buffer, data_len, cert_file, password, signature, &sign_len);
 304
 305         /* get cert chain */
 306         net_nfc_util_get_cert_list_from_file(cert_file, password, &cert_buffer, &cert_len, &cert_count);
 307
 308         /* create payload */
 309         payload.length = sizeof(net_nfc_signature_record_s) + sign_len + sizeof(net_nfc_certificate_chain_s) + cert_len;
 310
 311         _net_nfc_util_alloc_mem(payload.buffer, payload.length);
 312
 313         net_nfc_signature_record_s *sign_record = (net_nfc_signature_record_s *)payload.buffer;
 314         sign_record->version = 1;
 315         sign_record->uri_present = 0;
 316         sign_record->sign_type = NET_NFC_SIGN_TYPE_PKCS_1;
 317
 318         if (sign_record->uri_present)
 319         {
 320                 /* TODO */
 321         }
 322         else
 323         {
 324                 __FILL_SUB_FIELD(&(sign_record->signature), signature, sign_len);
 325         }
 326
 327         net_nfc_certificate_chain_s *chain = (net_nfc_certificate_chain_s *)__NEXT_SUB_FIELD(&(sign_record->signature));
 328         if (cert_count < 16)
 329         {
 330                 chain->uri_present = 0;
 331         }
 332         else
 333         {
 334                 chain->uri_present = 1;
 335         }
 336
 337         chain->cert_format = NET_NFC_CERT_FORMAT_X_509;
 338         chain->num_of_certs = cert_count;
 339         memcpy(chain->cert_store, cert_buffer, cert_len);
 340
 341         if (chain->uri_present)
 342         {
 343                 /* TODO */
 344                 DEBUG_ERR_MSG("num_of_certs is greater than 15 [%d]", cert_count);
 345         }
 346
 347         /* create record */
 348         data_s type = { (uint8_t *)"Sig", 3 };
 349
 350         net_nfc_util_create_record(NET_NFC_RECORD_WELL_KNOWN_TYPE, &type, NULL, &payload, &record);
 351
 352         /* get last record index */
 353         net_nfc_util_append_record_by_index(msg, end_index + 1, record);
 354
 355         _net_nfc_util_free_mem(payload.buffer);
 356         _net_nfc_util_free_mem(cert_buffer);
 357         _net_nfc_util_free_mem(data_buffer);
 358
 359         return result;
 360 }
 361
 362 net_nfc_error_e net_nfc_util_sign_ndef_message(ndef_message_s *msg, char *cert_file, char *password)
 363 {
 364         net_nfc_error_e result = NET_NFC_UNKNOWN_ERROR;
 365
 366         if (msg->recordCount > 0)
 367         {
 368                 net_nfc_util_sign_records(msg, 0, msg->recordCount - 1, cert_file, password);
 369
 370                 result = NET_NFC_OK;
 371         }
 372
 373         return result;
 374 }