libcacard/cac.c

   1 /*
   2  * implement the applets for the CAC card.
   3  *
   4  * This code is licensed under the GNU LGPL, version 2.1 or later.
   5  * See the COPYING.LIB file in the top-level directory.
   6  */
   7
   8 #include "qemu-common.h"
   9
  10 #include "cac.h"
  11 #include "vcard.h"
  12 #include "vcard_emul.h"
  13 #include "card_7816.h"
  14
  15 /* private data for PKI applets */
  16 typedef struct CACPKIAppletDataStruct {
  17     unsigned char *cert;
  18     int cert_len;
  19     unsigned char *cert_buffer;
  20     int cert_buffer_len;
  21     unsigned char *sign_buffer;
  22     int sign_buffer_len;
  23     VCardKey *key;
  24 } CACPKIAppletData;
  25
  26 /*
  27  * CAC applet private data
  28  */
  29 struct VCardAppletPrivateStruct {
  30     union {
  31         CACPKIAppletData pki_data;
  32         void *reserved;
  33     } u;
  34 };
  35
  36 /*
  37  * handle all the APDU's that are common to all CAC applets
  38  */
  39 static VCardStatus
  40 cac_common_process_apdu(VCard *card, VCardAPDU *apdu, VCardResponse **response)
  41 {
  42     int ef;
  43     VCardStatus ret = VCARD_FAIL;
  44
  45     switch (apdu->a_ins) {
  46     case VCARD7816_INS_SELECT_FILE:
  47         if (apdu->a_p1 != 0x02) {
  48             /* let the 7816 code handle applet switches */
  49             ret = VCARD_NEXT;
  50             break;
  51         }
  52         /* handle file id setting */
  53         if (apdu->a_Lc != 2) {
  54             *response = vcard_make_response(
  55                 VCARD7816_STATUS_ERROR_DATA_INVALID);
  56             ret = VCARD_DONE;
  57             break;
  58         }
  59         /* CAC 1.0 only supports ef = 0 */
  60         ef = apdu->a_body[0] | (apdu->a_body[1] << 8);
  61         if (ef != 0) {
  62             *response = vcard_make_response(
  63                 VCARD7816_STATUS_ERROR_FILE_NOT_FOUND);
  64             ret = VCARD_DONE;
  65             break;
  66         }
  67         *response = vcard_make_response(VCARD7816_STATUS_SUCCESS);
  68         ret = VCARD_DONE;
  69         break;
  70     case VCARD7816_INS_GET_RESPONSE:
  71     case VCARD7816_INS_VERIFY:
  72         /* let the 7816 code handle these */
  73         ret = VCARD_NEXT;
  74         break;
  75     case CAC_GET_PROPERTIES:
  76     case CAC_GET_ACR:
  77         /* skip these for now, this will probably be needed */
  78         *response = vcard_make_response(VCARD7816_STATUS_ERROR_P1_P2_INCORRECT);
  79         ret = VCARD_DONE;
  80         break;
  81     default:
  82         *response = vcard_make_response(
  83             VCARD7816_STATUS_ERROR_COMMAND_NOT_SUPPORTED);
  84         ret = VCARD_DONE;
  85         break;
  86     }
  87     return ret;
  88 }
  89
  90 /*
  91  *  reset the inter call state between applet selects
  92  */
  93 static VCardStatus
  94 cac_applet_pki_reset(VCard *card, int channel)
  95 {
  96     VCardAppletPrivate *applet_private;
  97     CACPKIAppletData *pki_applet;
  98     applet_private = vcard_get_current_applet_private(card, channel);
  99     assert(applet_private);
 100     pki_applet = &(applet_private->u.pki_data);
 101
 102     pki_applet->cert_buffer = NULL;
 103     if (pki_applet->sign_buffer) {
 104         g_free(pki_applet->sign_buffer);
 105         pki_applet->sign_buffer = NULL;
 106     }
 107     pki_applet->cert_buffer_len = 0;
 108     pki_applet->sign_buffer_len = 0;
 109     return VCARD_DONE;
 110 }
 111
 112 static VCardStatus
 113 cac_applet_pki_process_apdu(VCard *card, VCardAPDU *apdu,
 114                             VCardResponse **response)
 115 {
 116     CACPKIAppletData *pki_applet;
 117     VCardAppletPrivate *applet_private;
 118     int size, next;
 119     unsigned char *sign_buffer;
 120     vcard_7816_status_t status;
 121     VCardStatus ret = VCARD_FAIL;
 122
 123     applet_private = vcard_get_current_applet_private(card, apdu->a_channel);
 124     assert(applet_private);
 125     pki_applet = &(applet_private->u.pki_data);
 126
 127     switch (apdu->a_ins) {
 128     case CAC_UPDATE_BUFFER:
 129         *response = vcard_make_response(
 130             VCARD7816_STATUS_ERROR_CONDITION_NOT_SATISFIED);
 131         ret = VCARD_DONE;
 132         break;
 133     case CAC_GET_CERTIFICATE:
 134         if ((apdu->a_p2 != 0) || (apdu->a_p1 != 0)) {
 135             *response = vcard_make_response(
 136                              VCARD7816_STATUS_ERROR_P1_P2_INCORRECT);
 137             break;
 138         }
 139         assert(pki_applet->cert != NULL);
 140         size = apdu->a_Le;
 141         if (pki_applet->cert_buffer == NULL) {
 142             pki_applet->cert_buffer = pki_applet->cert;
 143             pki_applet->cert_buffer_len = pki_applet->cert_len;
 144         }
 145         size = MIN(size, pki_applet->cert_buffer_len);
 146         next = MIN(255, pki_applet->cert_buffer_len - size);
 147         *response = vcard_response_new_bytes(
 148                         card, pki_applet->cert_buffer, size,
 149                         apdu->a_Le, next ?
 150                         VCARD7816_SW1_WARNING_CHANGE :
 151                         VCARD7816_SW1_SUCCESS,
 152                         next);
 153         pki_applet->cert_buffer += size;
 154         pki_applet->cert_buffer_len -= size;
 155         if ((*response == NULL) || (next == 0)) {
 156             pki_applet->cert_buffer = NULL;
 157         }
 158         if (*response == NULL) {
 159             *response = vcard_make_response(
 160                             VCARD7816_STATUS_EXC_ERROR_MEMORY_FAILURE);
 161         }
 162         ret = VCARD_DONE;
 163         break;
 164     case CAC_SIGN_DECRYPT:
 165         if (apdu->a_p2 != 0) {
 166             *response = vcard_make_response(
 167                              VCARD7816_STATUS_ERROR_P1_P2_INCORRECT);
 168             break;
 169         }
 170         size = apdu->a_Lc;
 171
 172         sign_buffer = g_realloc(pki_applet->sign_buffer,
 173                                 pki_applet->sign_buffer_len + size);
 174         memcpy(sign_buffer+pki_applet->sign_buffer_len, apdu->a_body, size);
 175         size += pki_applet->sign_buffer_len;
 176         switch (apdu->a_p1) {
 177         case  0x80:
 178             /* p1 == 0x80 means we haven't yet sent the whole buffer, wait for
 179              * the rest */
 180             pki_applet->sign_buffer = sign_buffer;
 181             pki_applet->sign_buffer_len = size;
 182             *response = vcard_make_response(VCARD7816_STATUS_SUCCESS);
 183             break;
 184         case 0x00:
 185             /* we now have the whole buffer, do the operation, result will be
 186              * in the sign_buffer */
 187             status = vcard_emul_rsa_op(card, pki_applet->key,
 188                                        sign_buffer, size);
 189             if (status != VCARD7816_STATUS_SUCCESS) {
 190                 *response = vcard_make_response(status);
 191                 break;
 192             }
 193             *response = vcard_response_new(card, sign_buffer, size, apdu->a_Le,
 194                                                      VCARD7816_STATUS_SUCCESS);
 195             if (*response == NULL) {
 196                 *response = vcard_make_response(
 197                                 VCARD7816_STATUS_EXC_ERROR_MEMORY_FAILURE);
 198             }
 199             break;
 200         default:
 201            *response = vcard_make_response(
 202                                 VCARD7816_STATUS_ERROR_P1_P2_INCORRECT);
 203             break;
 204         }
 205         g_free(sign_buffer);
 206         pki_applet->sign_buffer = NULL;
 207         pki_applet->sign_buffer_len = 0;
 208         ret = VCARD_DONE;
 209         break;
 210     case CAC_READ_BUFFER:
 211         /* new CAC call, go ahead and use the old version for now */
 212         /* TODO: implement */
 213         *response = vcard_make_response(
 214                                 VCARD7816_STATUS_ERROR_COMMAND_NOT_SUPPORTED);
 215         ret = VCARD_DONE;
 216         break;
 217     default:
 218         ret = cac_common_process_apdu(card, apdu, response);
 219         break;
 220     }
 221     return ret;
 222 }
 223
 224
 225 static VCardStatus
 226 cac_applet_id_process_apdu(VCard *card, VCardAPDU *apdu,
 227                            VCardResponse **response)
 228 {
 229     VCardStatus ret = VCARD_FAIL;
 230
 231     switch (apdu->a_ins) {
 232     case CAC_UPDATE_BUFFER:
 233         *response = vcard_make_response(
 234                         VCARD7816_STATUS_ERROR_CONDITION_NOT_SATISFIED);
 235         ret = VCARD_DONE;
 236         break;
 237     case CAC_READ_BUFFER:
 238         /* new CAC call, go ahead and use the old version for now */
 239         /* TODO: implement */
 240         *response = vcard_make_response(
 241                         VCARD7816_STATUS_ERROR_COMMAND_NOT_SUPPORTED);
 242         ret = VCARD_DONE;
 243         break;
 244     default:
 245         ret = cac_common_process_apdu(card, apdu, response);
 246         break;
 247     }
 248     return ret;
 249 }
 250
 251
 252 /*
 253  * TODO: if we ever want to support general CAC middleware, we will need to
 254  * implement the various containers.
 255  */
 256 static VCardStatus
 257 cac_applet_container_process_apdu(VCard *card, VCardAPDU *apdu,
 258                                   VCardResponse **response)
 259 {
 260     VCardStatus ret = VCARD_FAIL;
 261
 262     switch (apdu->a_ins) {
 263     case CAC_READ_BUFFER:
 264     case CAC_UPDATE_BUFFER:
 265         *response = vcard_make_response(
 266                         VCARD7816_STATUS_ERROR_COMMAND_NOT_SUPPORTED);
 267         ret = VCARD_DONE;
 268         break;
 269     default:
 270         ret = cac_common_process_apdu(card, apdu, response);
 271         break;
 272     }
 273     return ret;
 274 }
 275
 276 /*
 277  * utilities for creating and destroying the private applet data
 278  */
 279 static void
 280 cac_delete_pki_applet_private(VCardAppletPrivate *applet_private)
 281 {
 282     CACPKIAppletData *pki_applet_data;
 283
 284     if (applet_private == NULL) {
 285         return;
 286     }
 287     pki_applet_data = &(applet_private->u.pki_data);
 288     if (pki_applet_data->cert != NULL) {
 289         g_free(pki_applet_data->cert);
 290     }
 291     if (pki_applet_data->sign_buffer != NULL) {
 292         g_free(pki_applet_data->sign_buffer);
 293     }
 294     if (pki_applet_data->key != NULL) {
 295         vcard_emul_delete_key(pki_applet_data->key);
 296     }
 297     g_free(applet_private);
 298 }
 299
 300 static VCardAppletPrivate *
 301 cac_new_pki_applet_private(const unsigned char *cert,
 302                            int cert_len, VCardKey *key)
 303 {
 304     CACPKIAppletData *pki_applet_data;
 305     VCardAppletPrivate *applet_private;
 306
 307     applet_private = g_new0(VCardAppletPrivate, 1);
 308     pki_applet_data = &(applet_private->u.pki_data);
 309     pki_applet_data->cert = (unsigned char *)g_malloc(cert_len+1);
 310     /*
 311      * if we want to support compression, then we simply change the 0 to a 1
 312      * and compress the cert data with libz
 313      */
 314     pki_applet_data->cert[0] = 0; /* not compressed */
 315     memcpy(&pki_applet_data->cert[1], cert, cert_len);
 316     pki_applet_data->cert_len = cert_len+1;
 317
 318     pki_applet_data->key = key;
 319     return applet_private;
 320 }
 321
 322
 323 /*
 324  * create a new cac applet which links to a given cert
 325  */
 326 static VCardApplet *
 327 cac_new_pki_applet(int i, const unsigned char *cert,
 328                    int cert_len, VCardKey *key)
 329 {
 330     VCardAppletPrivate *applet_private;
 331     VCardApplet *applet;
 332     unsigned char pki_aid[] = { 0xa0, 0x00, 0x00, 0x00, 0x79, 0x01, 0x00 };
 333     int pki_aid_len = sizeof(pki_aid);
 334
 335     pki_aid[pki_aid_len-1] = i;
 336
 337     applet_private = cac_new_pki_applet_private(cert, cert_len, key);
 338     if (applet_private == NULL) {
 339         goto failure;
 340     }
 341     applet = vcard_new_applet(cac_applet_pki_process_apdu, cac_applet_pki_reset,
 342                               pki_aid, pki_aid_len);
 343     if (applet == NULL) {
 344         goto failure;
 345     }
 346     vcard_set_applet_private(applet, applet_private,
 347                              cac_delete_pki_applet_private);
 348     applet_private = NULL;
 349
 350     return applet;
 351
 352 failure:
 353     if (applet_private != NULL) {
 354         cac_delete_pki_applet_private(applet_private);
 355     }
 356     return NULL;
 357 }
 358
 359
 360 static unsigned char cac_default_container_aid[] = {
 361     0xa0, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00 };
 362 static unsigned char cac_id_aid[] = {
 363     0xa0, 0x00, 0x00, 0x00, 0x79, 0x03, 0x00 };
 364 /*
 365  * Initialize the cac card. This is the only public function in this file. All
 366  * the rest are connected through function pointers.
 367  */
 368 VCardStatus
 369 cac_card_init(VReader *reader, VCard *card,
 370               const char *params,
 371               unsigned char * const *cert,
 372               int cert_len[],
 373               VCardKey *key[] /* adopt the keys*/,
 374               int cert_count)
 375 {
 376     int i;
 377     VCardApplet *applet;
 378
 379     /* CAC Cards are VM Cards */
 380     vcard_set_type(card, VCARD_VM);
 381
 382     /* create one PKI applet for each cert */
 383     for (i = 0; i < cert_count; i++) {
 384         applet = cac_new_pki_applet(i, cert[i], cert_len[i], key[i]);
 385         if (applet == NULL) {
 386             goto failure;
 387         }
 388         vcard_add_applet(card, applet);
 389     }
 390
 391     /* create a default blank container applet */
 392     applet = vcard_new_applet(cac_applet_container_process_apdu,
 393                               NULL, cac_default_container_aid,
 394                               sizeof(cac_default_container_aid));
 395     if (applet == NULL) {
 396         goto failure;
 397     }
 398     vcard_add_applet(card, applet);
 399
 400     /* create a default blank container applet */
 401     applet = vcard_new_applet(cac_applet_id_process_apdu,
 402                               NULL, cac_id_aid,
 403                               sizeof(cac_id_aid));
 404     if (applet == NULL) {
 405         goto failure;
 406     }
 407     vcard_add_applet(card, applet);
 408     return VCARD_DONE;
 409
 410 failure:
 411     return VCARD_FAIL;
 412 }
 413