src/wifi-key-encryption.c

   1 /*
   2  * Network Configuration Module
   3  *
   4  * Copyright (c) 2000 - 2012 Samsung Electronics Co., Ltd. All rights reserved.
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  * http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  */
  19
  20 #include <stdlib.h>
  21 #include <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <fcntl.h>
  24 #include <glib.h>
  25 #include <ckmc/ckmc-type.h>
  26 #include <ckmc/ckmc-manager.h>
  27 #include <tizen.h>
  28
  29 #include "log.h"
  30 #include "util.h"
  31 #include "wifi-key-encryption.h"
  32
  33 #define KEY_ALIAS       "connman_wifi_passphrase"
  34 #define IV_ALIAS        "connman_wifi_enciv"
  35 #define AAD_ALIAS       "connman_wifi_gcmaad"
  36 #define URANDOM         "/dev/urandom"
  37
  38 #define PASSPHRASE      "Passphrase"
  39 #define RND_LENGTH      32
  40 #define AES_KEY_SIZE    256
  41 #define CKMC_ERROR_HANDLING(expression, release) err = expression; \
  42         if (CKMC_ERROR_NONE != err) { \
  43                 err_str = get_error_message(err); \
  44                 ERR(#expression " : %s", err_str); \
  45                 release; \
  46                 return NULL; \
  47         } \
  48         DBG(#expression " success");
  49
  50 static char* err_str;
  51 static int err;
  52
  53
  54 static int __netconfig_generate_random_bytes(unsigned char* bytes, int len)
  55 {
  56         int urfd = -1;
  57         int r;
  58
  59         if (len <= 0)
  60                 return 0;
  61
  62         urfd = open(URANDOM, O_RDONLY);
  63         if (urfd < 0) {
  64                 ERR("Could not open "URANDOM);
  65                 return 0;
  66         } else {
  67                 r = read(urfd, bytes, len);
  68                 if (r < 0) {
  69                         ERR("Could not read from "URANDOM);
  70                         close(urfd);
  71                         return 0;
  72                 } else if (r != len) {
  73                         ERR("Short read from "URANDOM);
  74                         close(urfd);
  75                         return 0;
  76                 }
  77         }
  78
  79         close(urfd);
  80         return 1;
  81 }
  82
  83 static void __netconfig_convert_hexstr_to_bytes(gchar* hexstr, int hlen, gchar* bin)
  84 {
  85         hlen = hlen / 2;
  86
  87         while (hlen) {
  88                 if (*hexstr >= '0' && *hexstr <= '9')
  89                         *bin = (*hexstr - '0') << 4;
  90                 else if (*hexstr >= 'a' && *hexstr <= 'f')
  91                         *bin = (*hexstr - 'a' + 10) << 4;
  92
  93                 hexstr++;
  94
  95                 if (*hexstr >= '0' && *hexstr <= '9')
  96                         *bin |= (*hexstr - '0') & 0x0f;
  97                 else if (*hexstr >= 'a' && *hexstr <= 'f')
  98                         *bin |= (*hexstr - 'a' + 10) & 0x0f;
  99
 100                 hexstr++;
 101                 bin++;
 102                 hlen--;
 103         }
 104 }
 105
 106 static int __netconfig_generate_aes_key()
 107 {
 108         ckmc_policy_s pol;
 109         pol.extractable = false;
 110         pol.password = NULL;
 111         int err;
 112
 113         err = ckmc_create_key_aes(AES_KEY_SIZE, KEY_ALIAS, pol);
 114
 115         if (err != CKMC_ERROR_NONE && err != CKMC_ERROR_DB_ALIAS_EXISTS)
 116                 return err;
 117
 118         return CKMC_ERROR_NONE;
 119 }
 120
 121 static void*  __netconfig_set_param_list_aes_gcm(ckmc_param_list_h param)
 122 {
 123         ckmc_raw_buffer_s *iv_buf = NULL;
 124         unsigned char rnd[RND_LENGTH];
 125         ckmc_raw_buffer_s *aad_buf = NULL;
 126         unsigned char aad[RND_LENGTH];
 127
 128         err = ckmc_get_data(IV_ALIAS, NULL, &iv_buf);
 129
 130         if (err == CKMC_ERROR_DB_ALIAS_UNKNOWN) {
 131                 ckmc_policy_s policy;
 132                 policy.extractable = true;
 133                 policy.password = NULL;
 134
 135                 if (!__netconfig_generate_random_bytes(rnd, RND_LENGTH))
 136                         return NULL;
 137
 138                 CKMC_ERROR_HANDLING(
 139                                 ckmc_buffer_new(rnd, RND_LENGTH, &iv_buf),
 140                                 NULL);
 141
 142                 CKMC_ERROR_HANDLING(
 143                                 ckmc_save_data(IV_ALIAS, *iv_buf, policy),
 144                                 ckmc_buffer_free(iv_buf));
 145         }
 146
 147         err = ckmc_get_data(AAD_ALIAS, NULL, &aad_buf);
 148
 149         if (err == CKMC_ERROR_DB_ALIAS_UNKNOWN) {
 150                 ckmc_policy_s policy;
 151                 policy.extractable = true;
 152                 policy.password = NULL;
 153
 154                 if (!__netconfig_generate_random_bytes(aad, RND_LENGTH)) {
 155                         ckmc_buffer_free(iv_buf);
 156                         return NULL;
 157                 }
 158
 159                 CKMC_ERROR_HANDLING(
 160                                 ckmc_buffer_new(aad, RND_LENGTH, &aad_buf),
 161                                 ckmc_buffer_free(iv_buf));
 162
 163                 CKMC_ERROR_HANDLING(
 164                                 ckmc_save_data(AAD_ALIAS, *aad_buf, policy),
 165                                 ckmc_buffer_free(iv_buf);\
 166                                 ckmc_buffer_free(aad_buf));
 167         }
 168
 169         CKMC_ERROR_HANDLING(
 170                         ckmc_param_list_set_buffer(param, CKMC_PARAM_ED_IV, iv_buf),
 171                         ckmc_buffer_free(iv_buf);\
 172                         ckmc_buffer_free(aad_buf));
 173
 174         CKMC_ERROR_HANDLING(
 175                         ckmc_param_list_set_buffer(param, CKMC_PARAM_ED_AAD, aad_buf),
 176                         ckmc_buffer_free(iv_buf);\
 177                         ckmc_buffer_free(aad_buf));
 178
 179         return GINT_TO_POINTER(1);
 180 }
 181
 182 gchar* _netconfig_encrypt_passphrase(const gchar *passphrase)
 183 {
 184         gchar* origin_value = NULL;
 185         gchar* encrypted_value = NULL;
 186
 187         ckmc_param_list_h param = NULL;
 188         ckmc_raw_buffer_s *ptext = NULL;
 189         ckmc_raw_buffer_s *ctext = NULL;
 190
 191         if (!passphrase)
 192                 return NULL;
 193
 194         origin_value = g_strdup(passphrase);
 195
 196         CKMC_ERROR_HANDLING(
 197                         __netconfig_generate_aes_key(),
 198                         g_free(origin_value));
 199
 200         CKMC_ERROR_HANDLING(
 201                         ckmc_generate_new_params(CKMC_ALGO_AES_GCM, &param),
 202                         g_free(origin_value));
 203
 204         if (__netconfig_set_param_list_aes_gcm(param) == NULL) {
 205                 ckmc_param_list_free(param);
 206                 g_free(origin_value);
 207                 return NULL;
 208         }
 209
 210         CKMC_ERROR_HANDLING(
 211                         ckmc_buffer_new((unsigned char*)origin_value,
 212                                 strlen((char*)origin_value) + 1, &ptext),
 213                         ckmc_param_list_free(param);\
 214                         g_free(origin_value));
 215
 216         CKMC_ERROR_HANDLING(
 217                         ckmc_encrypt_data(param, KEY_ALIAS, NULL, *ptext, &ctext),
 218                         ckmc_param_list_free(param);\
 219                         ckmc_buffer_free(ptext);\
 220                         g_free(origin_value));
 221
 222         if (ctext == NULL ||
 223                 (encrypted_value = g_try_malloc0(ctext->size * 2 + 1)) == NULL) {
 224                 DBG(" encrypted_value allocation failed");
 225                 ckmc_param_list_free(param);
 226                 ckmc_buffer_free(ptext);
 227                 ckmc_buffer_free(ctext);
 228                 g_free(origin_value);
 229                 return NULL;
 230         }
 231
 232         netconfig_convert_bytes_to_hexstr((const char *)ctext->data, ctext->size, encrypted_value);
 233
 234         g_free(origin_value);
 235
 236         ckmc_param_list_free(param);
 237         ckmc_buffer_free(ptext);
 238         ckmc_buffer_free(ctext);
 239
 240         return encrypted_value;
 241 }
 242
 243 gchar* _netconfig_decrypt_passphrase(const gchar *enc_data)
 244 {
 245         gchar *ehexstr = NULL;
 246         gchar *encrypted_value = NULL;
 247         gchar *passphrase = NULL;
 248
 249         ckmc_param_list_h param = NULL;
 250         ckmc_raw_buffer_s *ptext = NULL;
 251         ckmc_raw_buffer_s *ctext = NULL;
 252
 253         if (!enc_data)
 254                 return NULL;
 255
 256         ehexstr = g_strdup(enc_data);
 257
 258         CKMC_ERROR_HANDLING(
 259                         ckmc_generate_new_params(CKMC_ALGO_AES_GCM, &param),
 260                         g_free(ehexstr));
 261
 262         if (__netconfig_set_param_list_aes_gcm(param) == NULL) {
 263                 ckmc_param_list_free(param);
 264                 g_free(ehexstr);
 265                 return NULL;
 266         }
 267
 268         if ((encrypted_value = g_try_malloc0(strlen((char*)ehexstr)/2)) == NULL) {
 269                 DBG(" encrypted_value allocation failed");
 270                 ckmc_param_list_free(param);
 271                 g_free(ehexstr);
 272                 return NULL;
 273         }
 274
 275         __netconfig_convert_hexstr_to_bytes(ehexstr, strlen((char*)ehexstr), encrypted_value);
 276
 277         CKMC_ERROR_HANDLING(
 278                         ckmc_buffer_new((unsigned char*)encrypted_value,
 279                                         strlen((char*)ehexstr)/2, &ctext),
 280                         ckmc_param_list_free(param);\
 281                         g_free(encrypted_value);\
 282                         g_free(ehexstr));
 283
 284         g_free(ehexstr);
 285
 286         CKMC_ERROR_HANDLING(
 287                         ckmc_decrypt_data(param, KEY_ALIAS, NULL, *ctext, &ptext),
 288                         ckmc_param_list_free(param);\
 289                         ckmc_buffer_free(ctext);\
 290                         g_free(encrypted_value));
 291
 292         if (ptext != NULL)
 293                 passphrase = g_strdup((const gchar*)ptext->data);
 294
 295         ckmc_param_list_free(param);
 296         ckmc_buffer_free(ctext);
 297         ckmc_buffer_free(ptext);
 298         g_free(encrypted_value);
 299
 300         return passphrase;
 301 }
 302
 303 gboolean handle_encrypt_passphrase(Wifi *wifi, GDBusMethodInvocation *context, const gchar *passphrase)
 304 {
 305         gchar *enc_data = NULL;
 306
 307         if ((wifi == NULL) || (passphrase == NULL)) {
 308                 ERR("Invalid parameter");
 309                 netconfig_error_invalid_parameter(context);
 310                 return TRUE;
 311         }
 312
 313         enc_data = _netconfig_encrypt_passphrase(passphrase);
 314
 315         if (!enc_data) {
 316                 ERR("Failed to encrypt the passphrase");
 317                 netconfig_error_dbus_method_return(context, NETCONFIG_ERROR_INTERNAL, "OperationFailed");
 318                 return TRUE;
 319         }
 320
 321         wifi_complete_encrypt_passphrase(wifi, context, enc_data);
 322         g_free(enc_data);
 323
 324         return TRUE;
 325 }
 326
 327 gboolean handle_decrypt_passphrase(Wifi *wifi, GDBusMethodInvocation *context, const gchar *enc_data)
 328 {
 329         gchar *passphrase = NULL;
 330
 331         if ((wifi == NULL) || (enc_data == NULL)) {
 332                 ERR("Invalid parameter");
 333                 netconfig_error_invalid_parameter(context);
 334                 return TRUE;
 335         }
 336
 337         passphrase = _netconfig_decrypt_passphrase(enc_data);
 338
 339         if (!passphrase) {
 340                 ERR("Failed to decrypt the passphrase");
 341                 netconfig_error_dbus_method_return(context, NETCONFIG_ERROR_INTERNAL, "OperationFailed");
 342                 return TRUE;
 343         }
 344
 345         wifi_complete_decrypt_passphrase(wifi, context, passphrase);
 346         g_free(passphrase);
 347
 348         return TRUE;
 349 }
 350
 351 gboolean handle_decrypt_conf_obj(Wifi *wifi, GDBusMethodInvocation *context,
 352                 const gchar *enc_connector,
 353                 const gchar *enc_c_sign_key,
 354                 const gchar *enc_net_access_key)
 355 {
 356         GVariantBuilder *builder = NULL;
 357         gchar *connector = NULL;
 358         gchar *c_sign_key = NULL;
 359         gchar *net_access_key = NULL;
 360
 361         DBG("");
 362         if (!wifi || !enc_connector || !enc_c_sign_key || !enc_net_access_key) {
 363                 ERR("Invalid parameter");
 364                 netconfig_error_invalid_parameter(context);
 365                 return TRUE;
 366         }
 367
 368         connector = _netconfig_decrypt_passphrase(enc_connector);
 369         c_sign_key = _netconfig_decrypt_passphrase(enc_c_sign_key);
 370         net_access_key = _netconfig_decrypt_passphrase(enc_net_access_key);
 371
 372         if (!connector || !c_sign_key || !net_access_key) {
 373                 ERR("Failed to decrypt the configuration object");
 374                 netconfig_error_dbus_method_return(context, NETCONFIG_ERROR_INTERNAL, "OperationFailed");
 375                 g_free(connector);
 376                 g_free(c_sign_key);
 377                 g_free(net_access_key);
 378                 return TRUE;
 379         }
 380
 381         builder = g_variant_builder_new(G_VARIANT_TYPE("a{sv}"));
 382         g_variant_builder_add(builder, "{sv}", "connector",
 383                         g_variant_new_string(connector));
 384         g_variant_builder_add(builder, "{sv}", "c_sign_key",
 385                         g_variant_new_string(c_sign_key));
 386         g_variant_builder_add(builder, "{sv}", "net_access_key",
 387                         g_variant_new_string(net_access_key));
 388
 389         wifi_complete_decrypt_conf_obj(wifi, context, g_variant_builder_end(builder));
 390         g_variant_builder_unref(builder);
 391         g_free(connector);
 392         g_free(c_sign_key);
 393         g_free(net_access_key);
 394
 395         return TRUE;
 396 }
 397