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11#include "qemu/osdep.h"
12#include "sysemu/char.h"
13#include "qemu/error-report.h"
14#include "qemu/sockets.h"
15#include "ccid.h"
16#include "cacard/vscard_common.h"
17
18#define DPRINTF(card, lvl, fmt, ...) \
19do { \
20 if (lvl <= card->debug) { \
21 printf("ccid-card-passthru: " fmt , ## __VA_ARGS__); \
22 } \
23} while (0)
24
25#define D_WARN 1
26#define D_INFO 2
27#define D_MORE_INFO 3
28#define D_VERBOSE 4
29
30
31static const uint8_t DEFAULT_ATR[] = {
32
33
34
35
36
37
38 0x3B, 0xD5, 0x18, 0xFF, 0x80, 0x91, 0xFE, 0x1F, 0xC3, 0x80, 0x73, 0xC8, 0x21,
39 0x13, 0x08
40};
41
42#define VSCARD_IN_SIZE 65536
43
44
45#define MAX_ATR_SIZE 40
46
47typedef struct PassthruState PassthruState;
48
49struct PassthruState {
50 CCIDCardState base;
51 CharDriverState *cs;
52 uint8_t vscard_in_data[VSCARD_IN_SIZE];
53 uint32_t vscard_in_pos;
54 uint32_t vscard_in_hdr;
55 uint8_t atr[MAX_ATR_SIZE];
56 uint8_t atr_length;
57 uint8_t debug;
58};
59
60#define TYPE_CCID_PASSTHRU "ccid-card-passthru"
61#define PASSTHRU_CCID_CARD(obj) \
62 OBJECT_CHECK(PassthruState, (obj), TYPE_CCID_PASSTHRU)
63
64
65
66
67
68
69static void ccid_card_vscard_send_msg(PassthruState *s,
70 VSCMsgType type, uint32_t reader_id,
71 const uint8_t *payload, uint32_t length)
72{
73 VSCMsgHeader scr_msg_header;
74
75 scr_msg_header.type = htonl(type);
76 scr_msg_header.reader_id = htonl(reader_id);
77 scr_msg_header.length = htonl(length);
78 qemu_chr_fe_write(s->cs, (uint8_t *)&scr_msg_header, sizeof(VSCMsgHeader));
79 qemu_chr_fe_write(s->cs, payload, length);
80}
81
82static void ccid_card_vscard_send_apdu(PassthruState *s,
83 const uint8_t *apdu, uint32_t length)
84{
85 ccid_card_vscard_send_msg(
86 s, VSC_APDU, VSCARD_MINIMAL_READER_ID, apdu, length);
87}
88
89static void ccid_card_vscard_send_error(PassthruState *s,
90 uint32_t reader_id, VSCErrorCode code)
91{
92 VSCMsgError msg = {.code = htonl(code)};
93
94 ccid_card_vscard_send_msg(
95 s, VSC_Error, reader_id, (uint8_t *)&msg, sizeof(msg));
96}
97
98static void ccid_card_vscard_send_init(PassthruState *s)
99{
100 VSCMsgInit msg = {
101 .version = htonl(VSCARD_VERSION),
102 .magic = VSCARD_MAGIC,
103 .capabilities = {0}
104 };
105
106 ccid_card_vscard_send_msg(s, VSC_Init, VSCARD_UNDEFINED_READER_ID,
107 (uint8_t *)&msg, sizeof(msg));
108}
109
110static int ccid_card_vscard_can_read(void *opaque)
111{
112 PassthruState *card = opaque;
113
114 return VSCARD_IN_SIZE >= card->vscard_in_pos ?
115 VSCARD_IN_SIZE - card->vscard_in_pos : 0;
116}
117
118static void ccid_card_vscard_handle_init(
119 PassthruState *card, VSCMsgHeader *hdr, VSCMsgInit *init)
120{
121 uint32_t *capabilities;
122 int num_capabilities;
123 int i;
124
125 capabilities = init->capabilities;
126 num_capabilities =
127 1 + ((hdr->length - sizeof(VSCMsgInit)) / sizeof(uint32_t));
128 init->version = ntohl(init->version);
129 for (i = 0 ; i < num_capabilities; ++i) {
130 capabilities[i] = ntohl(capabilities[i]);
131 }
132 if (init->magic != VSCARD_MAGIC) {
133 error_report("wrong magic");
134
135 }
136 if (init->version != VSCARD_VERSION) {
137 DPRINTF(card, D_WARN,
138 "got version %d, have %d", init->version, VSCARD_VERSION);
139 }
140
141 ccid_card_vscard_send_init(card);
142}
143
144static int check_atr(PassthruState *card, uint8_t *data, int len)
145{
146 int historical_length, opt_bytes;
147 int td_count = 0;
148 int td;
149
150 if (len < 2) {
151 return 0;
152 }
153 historical_length = data[1] & 0xf;
154 opt_bytes = 0;
155 if (data[0] != 0x3b && data[0] != 0x3f) {
156 DPRINTF(card, D_WARN, "atr's T0 is 0x%X, not in {0x3b, 0x3f}\n",
157 data[0]);
158 return 0;
159 }
160 td_count = 0;
161 td = data[1] >> 4;
162 while (td && td_count < 2 && opt_bytes + historical_length + 2 < len) {
163 td_count++;
164 if (td & 0x1) {
165 opt_bytes++;
166 }
167 if (td & 0x2) {
168 opt_bytes++;
169 }
170 if (td & 0x4) {
171 opt_bytes++;
172 }
173 if (td & 0x8) {
174 opt_bytes++;
175 td = data[opt_bytes + 2] >> 4;
176 }
177 }
178 if (len < 2 + historical_length + opt_bytes) {
179 DPRINTF(card, D_WARN,
180 "atr too short: len %d, but historical_len %d, T1 0x%X\n",
181 len, historical_length, data[1]);
182 return 0;
183 }
184 if (len > 2 + historical_length + opt_bytes) {
185 DPRINTF(card, D_WARN,
186 "atr too long: len %d, but hist/opt %d/%d, T1 0x%X\n",
187 len, historical_length, opt_bytes, data[1]);
188
189 }
190 DPRINTF(card, D_VERBOSE,
191 "atr passes check: %d total length, %d historical, %d optional\n",
192 len, historical_length, opt_bytes);
193
194 return 1;
195}
196
197static void ccid_card_vscard_handle_message(PassthruState *card,
198 VSCMsgHeader *scr_msg_header)
199{
200 uint8_t *data = (uint8_t *)&scr_msg_header[1];
201
202 switch (scr_msg_header->type) {
203 case VSC_ATR:
204 DPRINTF(card, D_INFO, "VSC_ATR %d\n", scr_msg_header->length);
205 if (scr_msg_header->length > MAX_ATR_SIZE) {
206 error_report("ATR size exceeds spec, ignoring");
207 ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
208 VSC_GENERAL_ERROR);
209 break;
210 }
211 if (!check_atr(card, data, scr_msg_header->length)) {
212 error_report("ATR is inconsistent, ignoring");
213 ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
214 VSC_GENERAL_ERROR);
215 break;
216 }
217 memcpy(card->atr, data, scr_msg_header->length);
218 card->atr_length = scr_msg_header->length;
219 ccid_card_card_inserted(&card->base);
220 ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
221 VSC_SUCCESS);
222 break;
223 case VSC_APDU:
224 ccid_card_send_apdu_to_guest(
225 &card->base, data, scr_msg_header->length);
226 break;
227 case VSC_CardRemove:
228 DPRINTF(card, D_INFO, "VSC_CardRemove\n");
229 ccid_card_card_removed(&card->base);
230 ccid_card_vscard_send_error(card,
231 scr_msg_header->reader_id, VSC_SUCCESS);
232 break;
233 case VSC_Init:
234 ccid_card_vscard_handle_init(
235 card, scr_msg_header, (VSCMsgInit *)data);
236 break;
237 case VSC_Error:
238 ccid_card_card_error(&card->base, *(uint32_t *)data);
239 break;
240 case VSC_ReaderAdd:
241 if (ccid_card_ccid_attach(&card->base) < 0) {
242 ccid_card_vscard_send_error(card, VSCARD_UNDEFINED_READER_ID,
243 VSC_CANNOT_ADD_MORE_READERS);
244 } else {
245 ccid_card_vscard_send_error(card, VSCARD_MINIMAL_READER_ID,
246 VSC_SUCCESS);
247 }
248 break;
249 case VSC_ReaderRemove:
250 ccid_card_ccid_detach(&card->base);
251 ccid_card_vscard_send_error(card,
252 scr_msg_header->reader_id, VSC_SUCCESS);
253 break;
254 default:
255 printf("usb-ccid: chardev: unexpected message of type %X\n",
256 scr_msg_header->type);
257 ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
258 VSC_GENERAL_ERROR);
259 }
260}
261
262static void ccid_card_vscard_drop_connection(PassthruState *card)
263{
264 qemu_chr_delete(card->cs);
265 card->vscard_in_pos = card->vscard_in_hdr = 0;
266}
267
268static void ccid_card_vscard_read(void *opaque, const uint8_t *buf, int size)
269{
270 PassthruState *card = opaque;
271 VSCMsgHeader *hdr;
272
273 if (card->vscard_in_pos + size > VSCARD_IN_SIZE) {
274 error_report(
275 "no room for data: pos %d + size %d > %d. dropping connection.",
276 card->vscard_in_pos, size, VSCARD_IN_SIZE);
277 ccid_card_vscard_drop_connection(card);
278 return;
279 }
280 assert(card->vscard_in_pos < VSCARD_IN_SIZE);
281 assert(card->vscard_in_hdr < VSCARD_IN_SIZE);
282 memcpy(card->vscard_in_data + card->vscard_in_pos, buf, size);
283 card->vscard_in_pos += size;
284 hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);
285
286 while ((card->vscard_in_pos - card->vscard_in_hdr >= sizeof(VSCMsgHeader))
287 &&(card->vscard_in_pos - card->vscard_in_hdr >=
288 sizeof(VSCMsgHeader) + ntohl(hdr->length))) {
289 hdr->reader_id = ntohl(hdr->reader_id);
290 hdr->length = ntohl(hdr->length);
291 hdr->type = ntohl(hdr->type);
292 ccid_card_vscard_handle_message(card, hdr);
293 card->vscard_in_hdr += hdr->length + sizeof(VSCMsgHeader);
294 hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);
295 }
296 if (card->vscard_in_hdr == card->vscard_in_pos) {
297 card->vscard_in_pos = card->vscard_in_hdr = 0;
298 }
299}
300
301static void ccid_card_vscard_event(void *opaque, int event)
302{
303 PassthruState *card = opaque;
304
305 switch (event) {
306 case CHR_EVENT_BREAK:
307 card->vscard_in_pos = card->vscard_in_hdr = 0;
308 break;
309 case CHR_EVENT_FOCUS:
310 break;
311 case CHR_EVENT_OPENED:
312 DPRINTF(card, D_INFO, "%s: CHR_EVENT_OPENED\n", __func__);
313 break;
314 }
315}
316
317
318
319static void passthru_apdu_from_guest(
320 CCIDCardState *base, const uint8_t *apdu, uint32_t len)
321{
322 PassthruState *card = PASSTHRU_CCID_CARD(base);
323
324 if (!card->cs) {
325 printf("ccid-passthru: no chardev, discarding apdu length %d\n", len);
326 return;
327 }
328 ccid_card_vscard_send_apdu(card, apdu, len);
329}
330
331static const uint8_t *passthru_get_atr(CCIDCardState *base, uint32_t *len)
332{
333 PassthruState *card = PASSTHRU_CCID_CARD(base);
334
335 *len = card->atr_length;
336 return card->atr;
337}
338
339static int passthru_initfn(CCIDCardState *base)
340{
341 PassthruState *card = PASSTHRU_CCID_CARD(base);
342
343 card->vscard_in_pos = 0;
344 card->vscard_in_hdr = 0;
345 if (card->cs) {
346 DPRINTF(card, D_INFO, "initing chardev\n");
347 qemu_chr_add_handlers(card->cs,
348 ccid_card_vscard_can_read,
349 ccid_card_vscard_read,
350 ccid_card_vscard_event, card);
351 ccid_card_vscard_send_init(card);
352 } else {
353 error_report("missing chardev");
354 return -1;
355 }
356 card->debug = parse_debug_env("QEMU_CCID_PASSTHRU_DEBUG", D_VERBOSE,
357 card->debug);
358 assert(sizeof(DEFAULT_ATR) <= MAX_ATR_SIZE);
359 memcpy(card->atr, DEFAULT_ATR, sizeof(DEFAULT_ATR));
360 card->atr_length = sizeof(DEFAULT_ATR);
361 return 0;
362}
363
364static int passthru_exitfn(CCIDCardState *base)
365{
366 return 0;
367}
368
369static VMStateDescription passthru_vmstate = {
370 .name = "ccid-card-passthru",
371 .version_id = 1,
372 .minimum_version_id = 1,
373 .fields = (VMStateField[]) {
374 VMSTATE_BUFFER(vscard_in_data, PassthruState),
375 VMSTATE_UINT32(vscard_in_pos, PassthruState),
376 VMSTATE_UINT32(vscard_in_hdr, PassthruState),
377 VMSTATE_BUFFER(atr, PassthruState),
378 VMSTATE_UINT8(atr_length, PassthruState),
379 VMSTATE_END_OF_LIST()
380 }
381};
382
383static Property passthru_card_properties[] = {
384 DEFINE_PROP_CHR("chardev", PassthruState, cs),
385 DEFINE_PROP_UINT8("debug", PassthruState, debug, 0),
386 DEFINE_PROP_END_OF_LIST(),
387};
388
389static void passthru_class_initfn(ObjectClass *klass, void *data)
390{
391 DeviceClass *dc = DEVICE_CLASS(klass);
392 CCIDCardClass *cc = CCID_CARD_CLASS(klass);
393
394 cc->initfn = passthru_initfn;
395 cc->exitfn = passthru_exitfn;
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
