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11#include "qemu/osdep.h"
12#include "qemu-common.h"
13#include "qemu/units.h"
14#include <libcacard.h>
15#include "chardev/char-fe.h"
16#include "hw/qdev-properties.h"
17#include "migration/vmstate.h"
18#include "qemu/error-report.h"
19#include "qemu/module.h"
20#include "qemu/sockets.h"
21#include "ccid.h"
22#include "qapi/error.h"
23
24#define DPRINTF(card, lvl, fmt, ...) \
25do { \
26 if (lvl <= card->debug) { \
27 printf("ccid-card-passthru: " fmt , ## __VA_ARGS__); \
28 } \
29} while (0)
30
31#define D_WARN 1
32#define D_INFO 2
33#define D_MORE_INFO 3
34#define D_VERBOSE 4
35
36
37static const uint8_t DEFAULT_ATR[] = {
38
39
40
41
42
43
44 0x3B, 0xD5, 0x18, 0xFF, 0x80, 0x91, 0xFE, 0x1F, 0xC3, 0x80, 0x73, 0xC8, 0x21,
45 0x13, 0x08
46};
47
48#define VSCARD_IN_SIZE (64 * KiB)
49
50
51#define MAX_ATR_SIZE 40
52
53typedef struct PassthruState PassthruState;
54
55struct PassthruState {
56 CCIDCardState base;
57 CharBackend cs;
58 uint8_t vscard_in_data[VSCARD_IN_SIZE];
59 uint32_t vscard_in_pos;
60 uint32_t vscard_in_hdr;
61 uint8_t atr[MAX_ATR_SIZE];
62 uint8_t atr_length;
63 uint8_t debug;
64};
65
66#define TYPE_CCID_PASSTHRU "ccid-card-passthru"
67#define PASSTHRU_CCID_CARD(obj) \
68 OBJECT_CHECK(PassthruState, (obj), TYPE_CCID_PASSTHRU)
69
70
71
72
73
74
75static void ccid_card_vscard_send_msg(PassthruState *s,
76 VSCMsgType type, uint32_t reader_id,
77 const uint8_t *payload, uint32_t length)
78{
79 VSCMsgHeader scr_msg_header;
80
81 scr_msg_header.type = htonl(type);
82 scr_msg_header.reader_id = htonl(reader_id);
83 scr_msg_header.length = htonl(length);
84
85
86 qemu_chr_fe_write_all(&s->cs, (uint8_t *)&scr_msg_header,
87 sizeof(VSCMsgHeader));
88 qemu_chr_fe_write_all(&s->cs, payload, length);
89}
90
91static void ccid_card_vscard_send_apdu(PassthruState *s,
92 const uint8_t *apdu, uint32_t length)
93{
94 ccid_card_vscard_send_msg(
95 s, VSC_APDU, VSCARD_MINIMAL_READER_ID, apdu, length);
96}
97
98static void ccid_card_vscard_send_error(PassthruState *s,
99 uint32_t reader_id, VSCErrorCode code)
100{
101 VSCMsgError msg = {.code = htonl(code)};
102
103 ccid_card_vscard_send_msg(
104 s, VSC_Error, reader_id, (uint8_t *)&msg, sizeof(msg));
105}
106
107static void ccid_card_vscard_send_init(PassthruState *s)
108{
109 VSCMsgInit msg = {
110 .version = htonl(VSCARD_VERSION),
111 .magic = VSCARD_MAGIC,
112 .capabilities = {0}
113 };
114
115 ccid_card_vscard_send_msg(s, VSC_Init, VSCARD_UNDEFINED_READER_ID,
116 (uint8_t *)&msg, sizeof(msg));
117}
118
119static int ccid_card_vscard_can_read(void *opaque)
120{
121 PassthruState *card = opaque;
122
123 return VSCARD_IN_SIZE >= card->vscard_in_pos ?
124 VSCARD_IN_SIZE - card->vscard_in_pos : 0;
125}
126
127static void ccid_card_vscard_handle_init(
128 PassthruState *card, VSCMsgHeader *hdr, VSCMsgInit *init)
129{
130 uint32_t *capabilities;
131 int num_capabilities;
132 int i;
133
134 capabilities = init->capabilities;
135 num_capabilities =
136 1 + ((hdr->length - sizeof(VSCMsgInit)) / sizeof(uint32_t));
137 init->version = ntohl(init->version);
138 for (i = 0 ; i < num_capabilities; ++i) {
139 capabilities[i] = ntohl(capabilities[i]);
140 }
141 if (init->magic != VSCARD_MAGIC) {
142 error_report("wrong magic");
143
144 }
145 if (init->version != VSCARD_VERSION) {
146 DPRINTF(card, D_WARN,
147 "got version %d, have %d", init->version, VSCARD_VERSION);
148 }
149
150 ccid_card_vscard_send_init(card);
151}
152
153static int check_atr(PassthruState *card, uint8_t *data, int len)
154{
155 int historical_length, opt_bytes;
156 int td_count = 0;
157 int td;
158
159 if (len < 2) {
160 return 0;
161 }
162 historical_length = data[1] & 0xf;
163 opt_bytes = 0;
164 if (data[0] != 0x3b && data[0] != 0x3f) {
165 DPRINTF(card, D_WARN, "atr's T0 is 0x%X, not in {0x3b, 0x3f}\n",
166 data[0]);
167 return 0;
168 }
169 td_count = 0;
170 td = data[1] >> 4;
171 while (td && td_count < 2 && opt_bytes + historical_length + 2 < len) {
172 td_count++;
173 if (td & 0x1) {
174 opt_bytes++;
175 }
176 if (td & 0x2) {
177 opt_bytes++;
178 }
179 if (td & 0x4) {
180 opt_bytes++;
181 }
182 if (td & 0x8) {
183 opt_bytes++;
184 td = data[opt_bytes + 2] >> 4;
185 }
186 }
187 if (len < 2 + historical_length + opt_bytes) {
188 DPRINTF(card, D_WARN,
189 "atr too short: len %d, but historical_len %d, T1 0x%X\n",
190 len, historical_length, data[1]);
191 return 0;
192 }
193 if (len > 2 + historical_length + opt_bytes) {
194 DPRINTF(card, D_WARN,
195 "atr too long: len %d, but hist/opt %d/%d, T1 0x%X\n",
196 len, historical_length, opt_bytes, data[1]);
197
198 }
199 DPRINTF(card, D_VERBOSE,
200 "atr passes check: %d total length, %d historical, %d optional\n",
201 len, historical_length, opt_bytes);
202
203 return 1;
204}
205
206static void ccid_card_vscard_handle_message(PassthruState *card,
207 VSCMsgHeader *scr_msg_header)
208{
209 uint8_t *data = (uint8_t *)&scr_msg_header[1];
210
211 switch (scr_msg_header->type) {
212 case VSC_ATR:
213 DPRINTF(card, D_INFO, "VSC_ATR %d\n", scr_msg_header->length);
214 if (scr_msg_header->length > MAX_ATR_SIZE) {
215 error_report("ATR size exceeds spec, ignoring");
216 ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
217 VSC_GENERAL_ERROR);
218 break;
219 }
220 if (!check_atr(card, data, scr_msg_header->length)) {
221 error_report("ATR is inconsistent, ignoring");
222 ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
223 VSC_GENERAL_ERROR);
224 break;
225 }
226 memcpy(card->atr, data, scr_msg_header->length);
227 card->atr_length = scr_msg_header->length;
228 ccid_card_card_inserted(&card->base);
229 ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
230 VSC_SUCCESS);
231 break;
232 case VSC_APDU:
233 ccid_card_send_apdu_to_guest(
234 &card->base, data, scr_msg_header->length);
235 break;
236 case VSC_CardRemove:
237 DPRINTF(card, D_INFO, "VSC_CardRemove\n");
238 ccid_card_card_removed(&card->base);
239 ccid_card_vscard_send_error(card,
240 scr_msg_header->reader_id, VSC_SUCCESS);
241 break;
242 case VSC_Init:
243 ccid_card_vscard_handle_init(
244 card, scr_msg_header, (VSCMsgInit *)data);
245 break;
246 case VSC_Error:
247 ccid_card_card_error(&card->base, *(uint32_t *)data);
248 break;
249 case VSC_ReaderAdd:
250 if (ccid_card_ccid_attach(&card->base) < 0) {
251 ccid_card_vscard_send_error(card, VSCARD_UNDEFINED_READER_ID,
252 VSC_CANNOT_ADD_MORE_READERS);
253 } else {
254 ccid_card_vscard_send_error(card, VSCARD_MINIMAL_READER_ID,
255 VSC_SUCCESS);
256 }
257 break;
258 case VSC_ReaderRemove:
259 ccid_card_ccid_detach(&card->base);
260 ccid_card_vscard_send_error(card,
261 scr_msg_header->reader_id, VSC_SUCCESS);
262 break;
263 default:
264 printf("usb-ccid: chardev: unexpected message of type %X\n",
265 scr_msg_header->type);
266 ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
267 VSC_GENERAL_ERROR);
268 }
269}
270
271static void ccid_card_vscard_drop_connection(PassthruState *card)
272{
273 qemu_chr_fe_deinit(&card->cs, true);
274 card->vscard_in_pos = card->vscard_in_hdr = 0;
275}
276
277static void ccid_card_vscard_read(void *opaque, const uint8_t *buf, int size)
278{
279 PassthruState *card = opaque;
280 VSCMsgHeader *hdr;
281
282 if (card->vscard_in_pos + size > VSCARD_IN_SIZE) {
283 error_report("no room for data: pos %u + size %d > %" PRId64 "."
284 " dropping connection.",
285 card->vscard_in_pos, size, VSCARD_IN_SIZE);
286 ccid_card_vscard_drop_connection(card);
287 return;
288 }
289 assert(card->vscard_in_pos < VSCARD_IN_SIZE);
290 assert(card->vscard_in_hdr < VSCARD_IN_SIZE);
291 memcpy(card->vscard_in_data + card->vscard_in_pos, buf, size);
292 card->vscard_in_pos += size;
293 hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);
294
295 while ((card->vscard_in_pos - card->vscard_in_hdr >= sizeof(VSCMsgHeader))
296 &&(card->vscard_in_pos - card->vscard_in_hdr >=
297 sizeof(VSCMsgHeader) + ntohl(hdr->length))) {
298 hdr->reader_id = ntohl(hdr->reader_id);
299 hdr->length = ntohl(hdr->length);
300 hdr->type = ntohl(hdr->type);
301 ccid_card_vscard_handle_message(card, hdr);
302 card->vscard_in_hdr += hdr->length + sizeof(VSCMsgHeader);
303 hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);
304 }
305 if (card->vscard_in_hdr == card->vscard_in_pos) {
306 card->vscard_in_pos = card->vscard_in_hdr = 0;
307 }
308}
309
310static void ccid_card_vscard_event(void *opaque, int event)
311{
312 PassthruState *card = opaque;
313
314 switch (event) {
315 case CHR_EVENT_BREAK:
316 card->vscard_in_pos = card->vscard_in_hdr = 0;
317 break;
318 case CHR_EVENT_OPENED:
319 DPRINTF(card, D_INFO, "%s: CHR_EVENT_OPENED\n", __func__);
320 break;
321 }
322}
323
324
325
326static void passthru_apdu_from_guest(
327 CCIDCardState *base, const uint8_t *apdu, uint32_t len)
328{
329 PassthruState *card = PASSTHRU_CCID_CARD(base);
330
331 if (!qemu_chr_fe_backend_connected(&card->cs)) {
332 printf("ccid-passthru: no chardev, discarding apdu length %d\n", len);
333 return;
334 }
335 ccid_card_vscard_send_apdu(card, apdu, len);
336}
337
338static const uint8_t *passthru_get_atr(CCIDCardState *base, uint32_t *len)
339{
340 PassthruState *card = PASSTHRU_CCID_CARD(base);
341
342 *len = card->atr_length;
343 return card->atr;
344}
345
346static void passthru_realize(CCIDCardState *base, Error **errp)
347{
348 PassthruState *card = PASSTHRU_CCID_CARD(base);
349
350 card->vscard_in_pos = 0;
351 card->vscard_in_hdr = 0;
352 if (qemu_chr_fe_backend_connected(&card->cs)) {
353 DPRINTF(card, D_INFO, "ccid-card-passthru: initing chardev");
354 qemu_chr_fe_set_handlers(&card->cs,
355 ccid_card_vscard_can_read,
356 ccid_card_vscard_read,
357 ccid_card_vscard_event, NULL, card, NULL, true);
358 ccid_card_vscard_send_init(card);
359 } else {
360 error_setg(errp, "missing chardev");
361 return;
362 }
363 card->debug = parse_debug_env("QEMU_CCID_PASSTHRU_DEBUG", D_VERBOSE,
364 card->debug);
365 assert(sizeof(DEFAULT_ATR) <= MAX_ATR_SIZE);
366 memcpy(card->atr, DEFAULT_ATR, sizeof(DEFAULT_ATR));
367 card->atr_length = sizeof(DEFAULT_ATR);
368}
369
370static VMStateDescription passthru_vmstate = {
371 .name = "ccid-card-passthru",
372 .version_id = 1,
373 .minimum_version_id = 1,
374 .fields = (VMStateField[]) {
375 VMSTATE_BUFFER(vscard_in_data, PassthruState),
376 VMSTATE_UINT32(vscard_in_pos, PassthruState),
377 VMSTATE_UINT32(vscard_in_hdr, PassthruState),
378 VMSTATE_BUFFER(atr, PassthruState),
379 VMSTATE_UINT8(atr_length, PassthruState),
380 VMSTATE_END_OF_LIST()
381 }
382};
383
384static Property passthru_card_properties[] = {
385 DEFINE_PROP_CHR("chardev", PassthruState, cs),
386 DEFINE_PROP_UINT8("debug", PassthruState, debug, 0),
387 DEFINE_PROP_END_OF_LIST(),
388};
389
390static void passthru_class_initfn(ObjectClass *klass, void *data)
391{
392 DeviceClass *dc = DEVICE_CLASS(klass);
393 CCIDCardClass *cc = CCID_CARD_CLASS(klass);
394
395 cc->realize = passthru_realize;
396 cc->get_atr = passthru_get_atr;
397 cc->apdu_from_guest = passthru_apdu_from_guest;
398 set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
399 dc->desc = "passthrough smartcard";
400 dc->vmsd = &passthru_vmstate;
401 dc->props = passthru_card_properties;
402}
403
404static const TypeInfo passthru_card_info = {
405 .name = TYPE_CCID_PASSTHRU,
406 .parent = TYPE_CCID_CARD,
407 .instance_size = sizeof(PassthruState),
408 .class_init = passthru_class_initfn,
409};
410
411static void ccid_card_passthru_register_types(void)
412{
413 type_register_static(&passthru_card_info);
414}
415
416type_init(ccid_card_passthru_register_types)
417
