aboutsummaryrefslogtreecommitdiff
path: root/libcacard/vreader.c
blob: ffa05b6ca52f839f20741c12d542e4e5f81f4db4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
/*
 * emulate the reader
 *
 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 * See the COPYING.LIB file in the top-level directory.
 */

#ifdef G_LOG_DOMAIN
#undef G_LOG_DOMAIN
#endif
#define G_LOG_DOMAIN "libcacard"
#include <glib.h>

#include "qemu-common.h"
#include "qemu/thread.h"

#include "vcard.h"
#include "vcard_emul.h"
#include "card_7816.h"
#include "vreader.h"
#include "vevent.h"
#include "cac.h" /* just for debugging defines */

#define LIBCACARD_LOG_DOMAIN "libcacard"

struct VReaderStruct {
    int    reference_count;
    VCard *card;
    char *name;
    vreader_id_t id;
    QemuMutex lock;
    VReaderEmul  *reader_private;
    VReaderEmulFree reader_private_free;
};

/*
 * Debug helpers
 */

static const char *
apdu_ins_to_string(int ins)
{
    switch (ins) {
    case VCARD7816_INS_MANAGE_CHANNEL:
        return "manage channel";
    case VCARD7816_INS_EXTERNAL_AUTHENTICATE:
        return "external authenticate";
    case VCARD7816_INS_GET_CHALLENGE:
        return "get challenge";
    case VCARD7816_INS_INTERNAL_AUTHENTICATE:
        return "internal authenticate";
    case VCARD7816_INS_ERASE_BINARY:
        return "erase binary";
    case VCARD7816_INS_READ_BINARY:
        return "read binary";
    case VCARD7816_INS_WRITE_BINARY:
        return "write binary";
    case VCARD7816_INS_UPDATE_BINARY:
        return "update binary";
    case VCARD7816_INS_READ_RECORD:
        return "read record";
    case VCARD7816_INS_WRITE_RECORD:
        return "write record";
    case VCARD7816_INS_UPDATE_RECORD:
        return "update record";
    case VCARD7816_INS_APPEND_RECORD:
        return "append record";
    case VCARD7816_INS_ENVELOPE:
        return "envelope";
    case VCARD7816_INS_PUT_DATA:
        return "put data";
    case VCARD7816_INS_GET_DATA:
        return "get data";
    case VCARD7816_INS_SELECT_FILE:
        return "select file";
    case VCARD7816_INS_VERIFY:
        return "verify";
    case VCARD7816_INS_GET_RESPONSE:
        return "get response";
    case CAC_GET_PROPERTIES:
        return "get properties";
    case CAC_GET_ACR:
        return "get acr";
    case CAC_READ_BUFFER:
        return "read buffer";
    case CAC_UPDATE_BUFFER:
        return "update buffer";
    case CAC_SIGN_DECRYPT:
        return "sign decrypt";
    case CAC_GET_CERTIFICATE:
        return "get certificate";
    }
    return "unknown";
}

/* manage locking */
static inline void
vreader_lock(VReader *reader)
{
    qemu_mutex_lock(&reader->lock);
}

static inline void
vreader_unlock(VReader *reader)
{
    qemu_mutex_unlock(&reader->lock);
}

/*
 * vreader constructor
 */
VReader *
vreader_new(const char *name, VReaderEmul *private,
            VReaderEmulFree private_free)
{
    VReader *reader;

    reader = g_new(VReader, 1);
    qemu_mutex_init(&reader->lock);
    reader->reference_count = 1;
    reader->name = g_strdup(name);
    reader->card = NULL;
    reader->id = (vreader_id_t)-1;
    reader->reader_private = private;
    reader->reader_private_free = private_free;
    return reader;
}

/* get a reference */
VReader*
vreader_reference(VReader *reader)
{
    if (reader == NULL) {
        return NULL;
    }
    vreader_lock(reader);
    reader->reference_count++;
    vreader_unlock(reader);
    return reader;
}

/* free a reference */
void
vreader_free(VReader *reader)
{
    if (reader == NULL) {
        return;
    }
    vreader_lock(reader);
    if (reader->reference_count-- > 1) {
        vreader_unlock(reader);
        return;
    }
    vreader_unlock(reader);
    if (reader->card) {
        vcard_free(reader->card);
    }
    g_free(reader->name);
    if (reader->reader_private_free) {
        reader->reader_private_free(reader->reader_private);
    }
    g_free(reader);
}

static VCard *
vreader_get_card(VReader *reader)
{
    VCard *card;

    vreader_lock(reader);
    card = vcard_reference(reader->card);
    vreader_unlock(reader);
    return card;
}

VReaderStatus
vreader_card_is_present(VReader *reader)
{
    VCard *card = vreader_get_card(reader);

    if (card == NULL) {
        return VREADER_NO_CARD;
    }
    vcard_free(card);
    return VREADER_OK;
}

vreader_id_t
vreader_get_id(VReader *reader)
{
    if (reader == NULL) {
        return (vreader_id_t)-1;
    }
    return reader->id;
}

VReaderStatus
vreader_set_id(VReader *reader, vreader_id_t id)
{
    if (reader == NULL) {
        return VREADER_NO_CARD;
    }
    reader->id = id;
    return VREADER_OK;
}

const char *
vreader_get_name(VReader *reader)
{
    if (reader == NULL) {
        return NULL;
    }
    return reader->name;
}

VReaderEmul *
vreader_get_private(VReader *reader)
{
    return reader->reader_private;
}

static VReaderStatus
vreader_reset(VReader *reader, VCardPower power, unsigned char *atr, int *len)
{
    VCard *card = vreader_get_card(reader);

    if (card == NULL) {
        return VREADER_NO_CARD;
    }
    /*
     * clean up our state
     */
    vcard_reset(card, power);
    if (atr) {
        vcard_get_atr(card, atr, len);
    }
    vcard_free(card); /* free our reference */
    return VREADER_OK;
}

VReaderStatus
vreader_power_on(VReader *reader, unsigned char *atr, int *len)
{
    return vreader_reset(reader, VCARD_POWER_ON, atr, len);
}

VReaderStatus
vreader_power_off(VReader *reader)
{
    return vreader_reset(reader, VCARD_POWER_OFF, NULL, 0);
}


VReaderStatus
vreader_xfr_bytes(VReader *reader,
                  unsigned char *send_buf, int send_buf_len,
                  unsigned char *receive_buf, int *receive_buf_len)
{
    VCardAPDU *apdu;
    VCardResponse *response = NULL;
    VCardStatus card_status;
    unsigned short status;
    VCard *card = vreader_get_card(reader);

    if (card == NULL) {
        return VREADER_NO_CARD;
    }

    apdu = vcard_apdu_new(send_buf, send_buf_len, &status);
    if (apdu == NULL) {
        response = vcard_make_response(status);
        card_status = VCARD_DONE;
    } else {
        g_debug("%s: CLS=0x%x,INS=0x%x,P1=0x%x,P2=0x%x,Lc=%d,Le=%d %s",
              __func__, apdu->a_cla, apdu->a_ins, apdu->a_p1, apdu->a_p2,
              apdu->a_Lc, apdu->a_Le, apdu_ins_to_string(apdu->a_ins));
        card_status = vcard_process_apdu(card, apdu, &response);
        if (response) {
            g_debug("%s: status=%d sw1=0x%x sw2=0x%x len=%d (total=%d)",
                  __func__, response->b_status, response->b_sw1,
                  response->b_sw2, response->b_len, response->b_total_len);
        }
    }
    assert(card_status == VCARD_DONE && response);
    int size = MIN(*receive_buf_len, response->b_total_len);
    memcpy(receive_buf, response->b_data, size);
    *receive_buf_len = size;
    vcard_response_delete(response);
    vcard_apdu_delete(apdu);
    vcard_free(card); /* free our reference */
    return VREADER_OK;
}

struct VReaderListStruct {
    VReaderListEntry *head;
    VReaderListEntry *tail;
};

struct VReaderListEntryStruct {
    VReaderListEntry *next;
    VReaderListEntry *prev;
    VReader *reader;
};


static VReaderListEntry *
vreader_list_entry_new(VReader *reader)
{
    VReaderListEntry *new_reader_list_entry;

    new_reader_list_entry = g_new0(VReaderListEntry, 1);
    new_reader_list_entry->reader = vreader_reference(reader);
    return new_reader_list_entry;
}

static void
vreader_list_entry_delete(VReaderListEntry *entry)
{
    if (entry == NULL) {
        return;
    }
    vreader_free(entry->reader);
    g_free(entry);
}


static VReaderList *
vreader_list_new(void)
{
    VReaderList *new_reader_list;

    new_reader_list = g_new0(VReaderList, 1);
    return new_reader_list;
}

void
vreader_list_delete(VReaderList *list)
{
    VReaderListEntry *current_entry;
    VReaderListEntry *next_entry;
    for (current_entry = vreader_list_get_first(list); current_entry;
         current_entry = next_entry) {
        next_entry = vreader_list_get_next(current_entry);
        vreader_list_entry_delete(current_entry);
    }
    list->head = NULL;
    list->tail = NULL;
    g_free(list);
}


VReaderListEntry *
vreader_list_get_first(VReaderList *list)
{
    return list ? list->head : NULL;
}

VReaderListEntry *
vreader_list_get_next(VReaderListEntry *current)
{
    return current ? current->next : NULL;
}

VReader *
vreader_list_get_reader(VReaderListEntry *entry)
{
    return entry ? vreader_reference(entry->reader) : NULL;
}

static void
vreader_queue(VReaderList *list, VReaderListEntry *entry)
{
    if (entry == NULL) {
        return;
    }
    entry->next = NULL;
    entry->prev = list->tail;
    if (list->head) {
        list->tail->next = entry;
    } else {
        list->head = entry;
    }
    list->tail = entry;
}

static void
vreader_dequeue(VReaderList *list, VReaderListEntry *entry)
{
    if (entry == NULL) {
        return;
    }
    if (entry->next == NULL) {
        list->tail = entry->prev;
    } else if (entry->prev == NULL) {
        list->head = entry->next;
    } else {
        entry->prev->next = entry->next;
        entry->next->prev = entry->prev;
    }
    if ((list->tail == NULL) || (list->head == NULL)) {
        list->head = list->tail = NULL;
    }
    entry->next = entry->prev = NULL;
}

static VReaderList *vreader_list;
static QemuMutex vreader_list_mutex;

static void
vreader_list_init(void)
{
    vreader_list = vreader_list_new();
    qemu_mutex_init(&vreader_list_mutex);
}

static void
vreader_list_lock(void)
{
    qemu_mutex_lock(&vreader_list_mutex);
}

static void
vreader_list_unlock(void)
{
    qemu_mutex_unlock(&vreader_list_mutex);
}

static VReaderList *
vreader_copy_list(VReaderList *list)
{
    VReaderList *new_list;
    VReaderListEntry *current_entry;

    new_list = vreader_list_new();
    if (new_list == NULL) {
        return NULL;
    }
    for (current_entry = vreader_list_get_first(list); current_entry;
         current_entry = vreader_list_get_next(current_entry)) {
        VReader *reader = vreader_list_get_reader(current_entry);
        VReaderListEntry *new_entry = vreader_list_entry_new(reader);

        vreader_free(reader);
        vreader_queue(new_list, new_entry);
    }
    return new_list;
}

VReaderList *
vreader_get_reader_list(void)
{
    VReaderList *new_reader_list;

    vreader_list_lock();
    new_reader_list = vreader_copy_list(vreader_list);
    vreader_list_unlock();
    return new_reader_list;
}

VReader *
vreader_get_reader_by_id(vreader_id_t id)
{
    VReader *reader = NULL;
    VReaderListEntry *current_entry;

    if (id == (vreader_id_t) -1) {
        return NULL;
    }

    vreader_list_lock();
    for (current_entry = vreader_list_get_first(vreader_list); current_entry;
            current_entry = vreader_list_get_next(current_entry)) {
        VReader *creader = vreader_list_get_reader(current_entry);
        if (creader->id == id) {
            reader = creader;
            break;
        }
        vreader_free(creader);
    }
    vreader_list_unlock();
    return reader;
}

VReader *
vreader_get_reader_by_name(const char *name)
{
    VReader *reader = NULL;
    VReaderListEntry *current_entry;

    vreader_list_lock();
    for (current_entry = vreader_list_get_first(vreader_list); current_entry;
            current_entry = vreader_list_get_next(current_entry)) {
        VReader *creader = vreader_list_get_reader(current_entry);
        if (strcmp(creader->name, name) == 0) {
            reader = creader;
            break;
        }
        vreader_free(creader);
    }
    vreader_list_unlock();
    return reader;
}

/* called from card_emul to initialize the readers */
VReaderStatus
vreader_add_reader(VReader *reader)
{
    VReaderListEntry *reader_entry;

    reader_entry = vreader_list_entry_new(reader);
    if (reader_entry == NULL) {
        return VREADER_OUT_OF_MEMORY;
    }
    vreader_list_lock();
    vreader_queue(vreader_list, reader_entry);
    vreader_list_unlock();
    vevent_queue_vevent(vevent_new(VEVENT_READER_INSERT, reader, NULL));
    return VREADER_OK;
}


VReaderStatus
vreader_remove_reader(VReader *reader)
{
    VReaderListEntry *current_entry;

    vreader_list_lock();
    for (current_entry = vreader_list_get_first(vreader_list); current_entry;
         current_entry = vreader_list_get_next(current_entry)) {
        if (current_entry->reader == reader) {
            break;
        }
    }
    vreader_dequeue(vreader_list, current_entry);
    vreader_list_unlock();
    vreader_list_entry_delete(current_entry);
    vevent_queue_vevent(vevent_new(VEVENT_READER_REMOVE, reader, NULL));
    return VREADER_OK;
}

/*
 * Generate VEVENT_CARD_INSERT or VEVENT_CARD_REMOVE based on vreader
 * state. Separated from vreader_insert_card to allow replaying events
 * for a given state.
 */
void
vreader_queue_card_event(VReader *reader)
{
    vevent_queue_vevent(vevent_new(
        reader->card ? VEVENT_CARD_INSERT : VEVENT_CARD_REMOVE, reader,
        reader->card));
}

/*
 * insert/remove a new card. for removal, card == NULL
 */
VReaderStatus
vreader_insert_card(VReader *reader, VCard *card)
{
    vreader_lock(reader);
    if (reader->card) {
        /* decrement reference count */
        vcard_free(reader->card);
        reader->card = NULL;
    }
    reader->card = vcard_reference(card);
    vreader_unlock(reader);
    vreader_queue_card_event(reader);
    return VREADER_OK;
}

/*
 * initialize all the static reader structures
 */
void
vreader_init(void)
{
    vreader_list_init();
}