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 #define CAC_GET_PROPERTIES  0x56
  16 #define CAC_GET_ACR         0x4c
  17 #define CAC_READ_BUFFER     0x52
  18 #define CAC_UPDATE_BUFFER   0x58
  19 #define CAC_SIGN_DECRYPT    0x42
  20 #define CAC_GET_CERTIFICATE 0x36
  21
  22 /* private data for PKI applets */
  23 typedef struct CACPKIAppletDataStruct {
  24     unsigned char *cert;
  25     int cert_len;
  26     unsigned char *cert_buffer;
  27     int cert_buffer_len;
  28     unsigned char *sign_buffer;
  29     int sign_buffer_len;
  30     VCardKey *key;
  31 } CACPKIAppletData;
  32
  33 /*
  34  * CAC applet private data
  35  */
  36 struct VCardAppletPrivateStruct {
  37     union {
  38         CACPKIAppletData pki_data;
  39         void *reserved;
  40     } u;
  41 };
  42
  43 /*
  44  * handle all the APDU's that are common to all CAC applets
  45  */
  46 static VCardStatus
  47 cac_common_process_apdu(VCard *card, VCardAPDU *apdu, VCardResponse **response)
  48 {
  49     int ef;
  50
  51     switch (apdu->a_ins) {
  52     case VCARD7816_INS_SELECT_FILE:
  53         if (apdu->a_p1 != 0x02) {
  54             /* let the 7816 code handle applet switches */
  55             return VCARD_NEXT;
  56         }
  57         /* handle file id setting */
  58         if (apdu->a_Lc != 2) {
  59             *response = vcard_make_response(
  60                 VCARD7816_STATUS_ERROR_DATA_INVALID);
  61             return VCARD_DONE;
  62         }
  63         /* CAC 1.0 only supports ef = 0 */
  64         ef = apdu->a_body[0] | (apdu->a_body[1] << 8);
  65         if (ef != 0) {
  66             *response = vcard_make_response(
  67                 VCARD7816_STATUS_ERROR_FILE_NOT_FOUND);
  68             return VCARD_DONE;
  69         }
  70         *response = vcard_make_response(VCARD7816_STATUS_SUCCESS);
  71         return VCARD_DONE;
  72     case VCARD7816_INS_GET_RESPONSE:
  73     case VCARD7816_INS_VERIFY:
  74         /* let the 7816 code handle these */
  75         return VCARD_NEXT;
  76     case CAC_GET_PROPERTIES:
  77     case CAC_GET_ACR:
  78         /* skip these for now, this will probably be needed */
  79         *response = vcard_make_response(VCARD7816_STATUS_ERROR_P1_P2_INCORRECT);
  80         return VCARD_DONE;
  81     }
  82     *response = vcard_make_response(
  83         VCARD7816_STATUS_ERROR_COMMAND_NOT_SUPPORTED);
  84     return VCARD_DONE;
  85 }
  86
  87 /*
  88  *  reset the inter call state between applet selects
  89  */
  90 static VCardStatus
  91 cac_applet_pki_reset(VCard *card, int channel)
  92 {
  93     VCardAppletPrivate *applet_private = NULL;
  94     CACPKIAppletData *pki_applet = NULL;
  95     applet_private = vcard_get_current_applet_private(card, channel);
  96     assert(applet_private);
  97     pki_applet = &(applet_private->u.pki_data);
  98
  99     pki_applet->cert_buffer = NULL;
 100     if (pki_applet->sign_buffer) {
 101         g_free(pki_applet->sign_buffer);
 102         pki_applet->sign_buffer = NULL;
 103     }
 104     pki_applet->cert_buffer_len = 0;
 105     pki_applet->sign_buffer_len = 0;
 106     return VCARD_DONE;
 107 }
 108
 109 static VCardStatus
 110 cac_applet_pki_process_apdu(VCard *card, VCardAPDU *apdu,
 111                             VCardResponse **response)
 112 {
 113     CACPKIAppletData *pki_applet = NULL;
 114     VCardAppletPrivate *applet_private = NULL;
 115     int size, next;
 116     unsigned char *sign_buffer;
 117     vcard_7816_status_t status;
 118
 119     applet_private = vcard_get_current_applet_private(card, apdu->a_channel);
 120     assert(applet_private);
 121     pki_applet = &(applet_private->u.pki_data);
 122
 123     switch (apdu->a_ins) {
 124     case CAC_UPDATE_BUFFER:
 125         *response = vcard_make_response(
 126             VCARD7816_STATUS_ERROR_CONDITION_NOT_SATISFIED);
 127         return VCARD_DONE;
 128     case CAC_GET_CERTIFICATE:
 129         if ((apdu->a_p2 != 0) || (apdu->a_p1 != 0)) {
 130             *response = vcard_make_response(
 131                              VCARD7816_STATUS_ERROR_P1_P2_INCORRECT);
 132             break;
 133         }
 134         assert(pki_applet->cert != NULL);
 135         size = apdu->a_Le;
 136         if (pki_applet->cert_buffer == NULL) {
 137             pki_applet->cert_buffer = pki_applet->cert;
 138             pki_applet->cert_buffer_len = pki_applet->cert_len;
 139         }
 140         size = MIN(size, pki_applet->cert_buffer_len);
 141         next = MIN(255, pki_applet->cert_buffer_len - size);
 142         *response = vcard_response_new_bytes(
 143                         card, pki_applet->cert_buffer, size,
 144                         apdu->a_Le, next ?
 145                         VCARD7816_SW1_WARNING_CHANGE :
 146                         VCARD7816_SW1_SUCCESS,
 147                         next);
 148         pki_applet->cert_buffer += size;
 149         pki_applet->cert_buffer_len -= size;
 150         if ((*response == NULL) || (next == 0)) {
 151             pki_applet->cert_buffer = NULL;
 152         }
 153         if (*response == NULL) {
 154             *response = vcard_make_response(
 155                             VCARD7816_STATUS_EXC_ERROR_MEMORY_FAILURE);
 156         }
 157         return VCARD_DONE;
 158     case CAC_SIGN_DECRYPT:
 159         if (apdu->a_p2 != 0) {
 160             *response = vcard_make_response(
 161                              VCARD7816_STATUS_ERROR_P1_P2_INCORRECT);
 162             break;
 163         }
 164         size = apdu->a_Lc;
 165
 166         sign_buffer = realloc(pki_applet->sign_buffer,
 167                       pki_applet->sign_buffer_len+size);
 168         if (sign_buffer == NULL) {
 169             g_free(pki_applet->sign_buffer);
 170             pki_applet->sign_buffer = NULL;
 171             pki_applet->sign_buffer_len = 0;
 172             *response = vcard_make_response(
 173                             VCARD7816_STATUS_EXC_ERROR_MEMORY_FAILURE);
 174             return VCARD_DONE;
 175         }
 176         memcpy(sign_buffer+pki_applet->sign_buffer_len, apdu->a_body, size);
 177         size += pki_applet->sign_buffer_len;
 178         switch (apdu->a_p1) {
 179         case  0x80:
 180             /* p1 == 0x80 means we haven't yet sent the whole buffer, wait for
 181              * the rest */
 182             pki_applet->sign_buffer = sign_buffer;
 183             pki_applet->sign_buffer_len = size;
 184             *response = vcard_make_response(VCARD7816_STATUS_SUCCESS);
 185             return VCARD_DONE;
 186         case 0x00:
 187             /* we now have the whole buffer, do the operation, result will be
 188              * in the sign_buffer */
 189             status = vcard_emul_rsa_op(card, pki_applet->key,
 190                                        sign_buffer, size);
 191             if (status != VCARD7816_STATUS_SUCCESS) {
 192                 *response = vcard_make_response(status);
 193                 break;
 194             }
 195             *response = vcard_response_new(card, sign_buffer, size, apdu->a_Le,
 196                                                      VCARD7816_STATUS_SUCCESS);
 197             if (*response == NULL) {
 198                 *response = vcard_make_response(
 199                                 VCARD7816_STATUS_EXC_ERROR_MEMORY_FAILURE);
 200             }
 201             break;
 202         default:
 203            *response = vcard_make_response(
 204                                 VCARD7816_STATUS_ERROR_P1_P2_INCORRECT);
 205             break;
 206         }
 207         g_free(sign_buffer);
 208         pki_applet->sign_buffer = NULL;
 209         pki_applet->sign_buffer_len = 0;
 210         return VCARD_DONE;
 211     case CAC_READ_BUFFER:
 212         /* new CAC call, go ahead and use the old version for now */
 213         /* TODO: implement */
 214         *response = vcard_make_response(
 215                                 VCARD7816_STATUS_ERROR_COMMAND_NOT_SUPPORTED);
 216         return VCARD_DONE;
 217     }
 218     return cac_common_process_apdu(card, apdu, response);
 219 }
 220
 221
 222 static VCardStatus
 223 cac_applet_id_process_apdu(VCard *card, VCardAPDU *apdu,
 224                            VCardResponse **response)
 225 {
 226     switch (apdu->a_ins) {
 227     case CAC_UPDATE_BUFFER:
 228         *response = vcard_make_response(
 229                         VCARD7816_STATUS_ERROR_CONDITION_NOT_SATISFIED);
 230         return VCARD_DONE;
 231     case CAC_READ_BUFFER:
 232         /* new CAC call, go ahead and use the old version for now */
 233         /* TODO: implement */
 234         *response = vcard_make_response(
 235                         VCARD7816_STATUS_ERROR_COMMAND_NOT_SUPPORTED);
 236         return VCARD_DONE;
 237     }
 238     return cac_common_process_apdu(card, apdu, response);
 239 }
 240
 241
 242 /*
 243  * TODO: if we ever want to support general CAC middleware, we will need to
 244  * implement the various containers.
 245  */
 246 static VCardStatus
 247 cac_applet_container_process_apdu(VCard *card, VCardAPDU *apdu,
 248                                   VCardResponse **response)
 249 {
 250     switch (apdu->a_ins) {
 251     case CAC_READ_BUFFER:
 252     case CAC_UPDATE_BUFFER:
 253         *response = vcard_make_response(
 254                         VCARD7816_STATUS_ERROR_COMMAND_NOT_SUPPORTED);
 255         return VCARD_DONE;
 256     default:
 257         break;
 258     }
 259     return cac_common_process_apdu(card, apdu, response);
 260 }
 261
 262 /*
 263  * utilities for creating and destroying the private applet data
 264  */
 265 static void
 266 cac_delete_pki_applet_private(VCardAppletPrivate *applet_private)
 267 {
 268     CACPKIAppletData *pki_applet_data = NULL;
 269
 270     if (applet_private == NULL) {
 271         return;
 272     }
 273     pki_applet_data = &(applet_private->u.pki_data);
 274     if (pki_applet_data->cert != NULL) {
 275         g_free(pki_applet_data->cert);
 276     }
 277     if (pki_applet_data->sign_buffer != NULL) {
 278         g_free(pki_applet_data->sign_buffer);
 279     }
 280     if (pki_applet_data->key != NULL) {
 281         vcard_emul_delete_key(pki_applet_data->key);
 282     }
 283     g_free(applet_private);
 284 }
 285
 286 static VCardAppletPrivate *
 287 cac_new_pki_applet_private(const unsigned char *cert,
 288                            int cert_len, VCardKey *key)
 289 {
 290     CACPKIAppletData *pki_applet_data = NULL;
 291     VCardAppletPrivate *applet_private = NULL;
 292     applet_private = (VCardAppletPrivate *)g_malloc(sizeof(VCardAppletPrivate));
 293
 294     pki_applet_data = &(applet_private->u.pki_data);
 295     pki_applet_data->cert_buffer = NULL;
 296     pki_applet_data->cert_buffer_len = 0;
 297     pki_applet_data->sign_buffer = NULL;
 298     pki_applet_data->sign_buffer_len = 0;
 299     pki_applet_data->key = NULL;
 300     pki_applet_data->cert = (unsigned char *)g_malloc(cert_len+1);
 301     /*
 302      * if we want to support compression, then we simply change the 0 to a 1
 303      * and compress the cert data with libz
 304      */
 305     pki_applet_data->cert[0] = 0; /* not compressed */
 306     memcpy(&pki_applet_data->cert[1], cert, cert_len);
 307     pki_applet_data->cert_len = cert_len+1;
 308
 309     pki_applet_data->key = key;
 310     return applet_private;
 311 }
 312
 313
 314 /*
 315  * create a new cac applet which links to a given cert
 316  */
 317 static VCardApplet *
 318 cac_new_pki_applet(int i, const unsigned char *cert,
 319                    int cert_len, VCardKey *key)
 320 {
 321     VCardAppletPrivate *applet_private = NULL;
 322     VCardApplet *applet = NULL;
 323     unsigned char pki_aid[] = { 0xa0, 0x00, 0x00, 0x00, 0x79, 0x01, 0x00 };
 324     int pki_aid_len = sizeof(pki_aid);
 325
 326     pki_aid[pki_aid_len-1] = i;
 327
 328     applet_private = cac_new_pki_applet_private(cert, cert_len, key);
 329     if (applet_private == NULL) {
 330         goto failure;
 331     }
 332     applet = vcard_new_applet(cac_applet_pki_process_apdu, cac_applet_pki_reset,
 333                               pki_aid, pki_aid_len);
 334     if (applet == NULL) {
 335         goto failure;
 336     }
 337     vcard_set_applet_private(applet, applet_private,
 338                              cac_delete_pki_applet_private);
 339     applet_private = NULL;
 340
 341     return applet;
 342
 343 failure:
 344     if (applet_private != NULL) {
 345         cac_delete_pki_applet_private(applet_private);
 346     }
 347     return NULL;
 348 }
 349
 350
 351 static unsigned char cac_default_container_aid[] = {
 352     0xa0, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00 };
 353 static unsigned char cac_id_aid[] = {
 354     0xa0, 0x00, 0x00, 0x00, 0x79, 0x03, 0x00 };
 355 /*
 356  * Initialize the cac card. This is the only public function in this file. All
 357  * the rest are connected through function pointers.
 358  */
 359 VCardStatus
 360 cac_card_init(VReader *reader, VCard *card,
 361               const char *params,
 362               unsigned char * const *cert,
 363               int cert_len[],
 364               VCardKey *key[] /* adopt the keys*/,
 365               int cert_count)
 366 {
 367     int i;
 368     VCardApplet *applet;
 369
 370     /* CAC Cards are VM Cards */
 371     vcard_set_type(card, VCARD_VM);
 372
 373     /* create one PKI applet for each cert */
 374     for (i = 0; i < cert_count; i++) {
 375         applet = cac_new_pki_applet(i, cert[i], cert_len[i], key[i]);
 376         if (applet == NULL) {
 377             goto failure;
 378         }
 379         vcard_add_applet(card, applet);
 380     }
 381
 382     /* create a default blank container applet */
 383     applet = vcard_new_applet(cac_applet_container_process_apdu,
 384                               NULL, cac_default_container_aid,
 385                               sizeof(cac_default_container_aid));
 386     if (applet == NULL) {
 387         goto failure;
 388     }
 389     vcard_add_applet(card, applet);
 390
 391     /* create a default blank container applet */
 392     applet = vcard_new_applet(cac_applet_id_process_apdu,
 393                               NULL, cac_id_aid,
 394                               sizeof(cac_id_aid));
 395     if (applet == NULL) {
 396         goto failure;
 397     }
 398     vcard_add_applet(card, applet);
 399     return VCARD_DONE;
 400
 401 failure:
 402     return VCARD_FAIL;
 403 }
 404