summaryrefslogtreecommitdiff
path: root/libcacard/vscclient.c
blob: 2191f6038c0156284c99f34bb1714ae02e6c5edd (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
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
/*
 * Tester for VSCARD protocol, client side.
 *
 * Can be used with ccid-card-passthru.
 *
 * Copyright (c) 2011 Red Hat.
 * Written by Alon Levy.
 *
 * 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.
 */

#include <netdb.h>

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

#include "vscard_common.h"

#include "vreader.h"
#include "vcard_emul.h"
#include "vevent.h"

int verbose;

int sock;

static void
print_byte_array(
    uint8_t *arrBytes,
    unsigned int nSize
) {
    int i;
    for (i = 0; i < nSize; i++) {
        printf("%02X ", arrBytes[i]);
    }
    printf("\n");
}

static void
print_usage(void) {
    printf("vscclient [-c <certname> .. -e <emul_args> -d <level>%s] "
            "<host> <port>\n",
#ifdef USE_PASSTHRU
    " -p");
    printf(" -p use passthrough mode\n");
#else
   "");
#endif
    vcard_emul_usage();
}

static QemuMutex write_lock;

static int
send_msg(
    VSCMsgType type,
    uint32_t reader_id,
    const void *msg,
    unsigned int length
) {
    int rv;
    VSCMsgHeader mhHeader;

    qemu_mutex_lock(&write_lock);

    if (verbose > 10) {
        printf("sending type=%d id=%d, len =%d (0x%x)\n",
               type, reader_id, length, length);
    }

    mhHeader.type = htonl(type);
    mhHeader.reader_id = 0;
    mhHeader.length = htonl(length);
    rv = write(sock, &mhHeader, sizeof(mhHeader));
    if (rv < 0) {
        /* Error */
        fprintf(stderr, "write header error\n");
        close(sock);
        qemu_mutex_unlock(&write_lock);
        return 16;
    }
    rv = write(sock, msg, length);
    if (rv < 0) {
        /* Error */
        fprintf(stderr, "write error\n");
        close(sock);
        qemu_mutex_unlock(&write_lock);
        return 16;
    }
    qemu_mutex_unlock(&write_lock);

    return 0;
}

static VReader *pending_reader;
static QemuMutex pending_reader_lock;
static QemuCond pending_reader_condition;

#define MAX_ATR_LEN 40
static void *
event_thread(void *arg)
{
    unsigned char atr[MAX_ATR_LEN];
    int atr_len = MAX_ATR_LEN;
    VEvent *event = NULL;
    unsigned int reader_id;


    while (1) {
        const char *reader_name;

        event = vevent_wait_next_vevent();
        if (event == NULL) {
            break;
        }
        reader_id = vreader_get_id(event->reader);
        if (reader_id == VSCARD_UNDEFINED_READER_ID &&
            event->type != VEVENT_READER_INSERT) {
            /* ignore events from readers qemu has rejected */
            /* if qemu is still deciding on this reader, wait to see if need to
             * forward this event */
            qemu_mutex_lock(&pending_reader_lock);
            if (!pending_reader || (pending_reader != event->reader)) {
                /* wasn't for a pending reader, this reader has already been
                 * rejected by qemu */
                qemu_mutex_unlock(&pending_reader_lock);
                vevent_delete(event);
                continue;
            }
            /* this reader hasn't been told it's status from qemu yet, wait for
             * that status */
            while (pending_reader != NULL) {
                qemu_cond_wait(&pending_reader_condition, &pending_reader_lock);
            }
            qemu_mutex_unlock(&pending_reader_lock);
            /* now recheck the id */
            reader_id = vreader_get_id(event->reader);
            if (reader_id == VSCARD_UNDEFINED_READER_ID) {
                /* this reader was rejected */
                vevent_delete(event);
                continue;
            }
            /* reader was accepted, now forward the event */
        }
        switch (event->type) {
        case VEVENT_READER_INSERT:
            /* tell qemu to insert a new CCID reader */
            /* wait until qemu has responded to our first reader insert
             * before we send a second. That way we won't confuse the responses
             * */
            qemu_mutex_lock(&pending_reader_lock);
            while (pending_reader != NULL) {
                qemu_cond_wait(&pending_reader_condition, &pending_reader_lock);
            }
            pending_reader = vreader_reference(event->reader);
            qemu_mutex_unlock(&pending_reader_lock);
            reader_name = vreader_get_name(event->reader);
            if (verbose > 10) {
                printf(" READER INSERT: %s\n", reader_name);
            }
            send_msg(VSC_ReaderAdd,
                reader_id, /* currerntly VSCARD_UNDEFINED_READER_ID */
                NULL, 0 /* TODO reader_name, strlen(reader_name) */);
            break;
        case VEVENT_READER_REMOVE:
            /* future, tell qemu that an old CCID reader has been removed */
            if (verbose > 10) {
                printf(" READER REMOVE: %d\n", reader_id);
            }
            send_msg(VSC_ReaderRemove, reader_id, NULL, 0);
            break;
        case VEVENT_CARD_INSERT:
            /* get the ATR (intended as a response to a power on from the
             * reader */
            atr_len = MAX_ATR_LEN;
            vreader_power_on(event->reader, atr, &atr_len);
            /* ATR call functions as a Card Insert event */
            if (verbose > 10) {
                printf(" CARD INSERT %d: ", reader_id);
                print_byte_array(atr, atr_len);
            }
            send_msg(VSC_ATR, reader_id, atr, atr_len);
            break;
        case VEVENT_CARD_REMOVE:
            /* Card removed */
            if (verbose > 10) {
                printf(" CARD REMOVE %d:\n", reader_id);
            }
            send_msg(VSC_CardRemove, reader_id, NULL, 0);
            break;
        default:
            break;
        }
        vevent_delete(event);
    }
    return NULL;
}


static unsigned int
get_id_from_string(char *string, unsigned int default_id)
{
    unsigned int id = atoi(string);

    /* don't accidentally swith to zero because no numbers have been supplied */
    if ((id == 0) && *string != '0') {
        return default_id;
    }
    return id;
}

static void
do_command(void)
{
    char inbuf[255];
    char *string;
    VCardEmulError error;
    static unsigned int default_reader_id;
    unsigned int reader_id;
    VReader *reader = NULL;

    reader_id = default_reader_id;
    string = fgets(inbuf, sizeof(inbuf), stdin);
    if (string != NULL) {
        if (strncmp(string, "exit", 4) == 0) {
            /* remove all the readers */
            VReaderList *list = vreader_get_reader_list();
            VReaderListEntry *reader_entry;
            printf("Active Readers:\n");
            for (reader_entry = vreader_list_get_first(list); reader_entry;
                 reader_entry = vreader_list_get_next(reader_entry)) {
                VReader *reader = vreader_list_get_reader(reader_entry);
                vreader_id_t reader_id;
                reader_id = vreader_get_id(reader);
                if (reader_id == -1) {
                    continue;
                }
                /* be nice and signal card removal first (qemu probably should
                 * do this itself) */
                if (vreader_card_is_present(reader) == VREADER_OK) {
                    send_msg(VSC_CardRemove, reader_id, NULL, 0);
                }
                send_msg(VSC_ReaderRemove, reader_id, NULL, 0);
            }
            exit(0);
        } else if (strncmp(string, "insert", 6) == 0) {
            if (string[6] == ' ') {
                reader_id = get_id_from_string(&string[7], reader_id);
            }
            reader = vreader_get_reader_by_id(reader_id);
            if (reader != NULL) {
                error = vcard_emul_force_card_insert(reader);
                printf("insert %s, returned %d\n",
                       reader ? vreader_get_name(reader)
                       : "invalid reader", error);
            } else {
                printf("no reader by id %d found\n", reader_id);
            }
        } else if (strncmp(string, "remove", 6) == 0) {
            if (string[6] == ' ') {
                reader_id = get_id_from_string(&string[7], reader_id);
            }
            reader = vreader_get_reader_by_id(reader_id);
            if (reader != NULL) {
                error = vcard_emul_force_card_remove(reader);
                printf("remove %s, returned %d\n",
                        reader ? vreader_get_name(reader)
                        : "invalid reader", error);
            } else {
                printf("no reader by id %d found\n", reader_id);
            }
        } else if (strncmp(string, "select", 6) == 0) {
            if (string[6] == ' ') {
                reader_id = get_id_from_string(&string[7],
                                               VSCARD_UNDEFINED_READER_ID);
            }
            if (reader_id != VSCARD_UNDEFINED_READER_ID) {
                reader = vreader_get_reader_by_id(reader_id);
            }
            if (reader) {
                printf("Selecting reader %d, %s\n", reader_id,
                        vreader_get_name(reader));
                default_reader_id = reader_id;
            } else {
                printf("Reader with id %d not found\n", reader_id);
            }
        } else if (strncmp(string, "debug", 5) == 0) {
            if (string[5] == ' ') {
                verbose = get_id_from_string(&string[6], 0);
            }
            printf("debug level = %d\n", verbose);
        } else if (strncmp(string, "list", 4) == 0) {
            VReaderList *list = vreader_get_reader_list();
            VReaderListEntry *reader_entry;
            printf("Active Readers:\n");
            for (reader_entry = vreader_list_get_first(list); reader_entry;
                 reader_entry = vreader_list_get_next(reader_entry)) {
                VReader *reader = vreader_list_get_reader(reader_entry);
                vreader_id_t reader_id;
                reader_id = vreader_get_id(reader);
                if (reader_id == -1) {
                    continue;
                }
                printf("%3d %s %s\n", reader_id,
                       vreader_card_is_present(reader) == VREADER_OK ?
                       "CARD_PRESENT" : "            ",
                       vreader_get_name(reader));
            }
            printf("Inactive Readers:\n");
            for (reader_entry = vreader_list_get_first(list); reader_entry;
                 reader_entry = vreader_list_get_next(reader_entry)) {
                VReader *reader = vreader_list_get_reader(reader_entry);
                vreader_id_t reader_id;
                reader_id = vreader_get_id(reader);
                if (reader_id != -1) {
                    continue;
                }

                printf("INA %s %s\n",
                       vreader_card_is_present(reader) == VREADER_OK ?
                       "CARD_PRESENT" : "            ",
                       vreader_get_name(reader));
            }
        } else if (*string != 0) {
            printf("valid commands:\n");
            printf("insert [reader_id]\n");
            printf("remove [reader_id]\n");
            printf("select reader_id\n");
            printf("list\n");
            printf("debug [level]\n");
            printf("exit\n");
        }
    }
    vreader_free(reader);
    printf("> ");
    fflush(stdout);
}


#define APDUBufSize 270

/* just for ease of parsing command line arguments. */
#define MAX_CERTS 100

static int
connect_to_qemu(
    const char *host,
    const char *port
) {
    struct addrinfo hints;
    struct addrinfo *server;
    int ret;

    sock = qemu_socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0) {
        /* Error */
        fprintf(stderr, "Error opening socket!\n");
    }

    memset(&hints, 0, sizeof(struct addrinfo));
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = 0;
    hints.ai_protocol = 0;          /* Any protocol */

    ret = getaddrinfo(host, port, &hints, &server);

    if (ret != 0) {
        /* Error */
        fprintf(stderr, "getaddrinfo failed\n");
        return 5;
    }

    if (connect(sock, server->ai_addr, server->ai_addrlen) < 0) {
        /* Error */
        fprintf(stderr, "Could not connect\n");
        return 5;
    }
    if (verbose) {
        printf("Connected (sizeof Header=%zd)!\n", sizeof(VSCMsgHeader));
    }
    return sock;
}

static int on_host_init(VSCMsgHeader *mhHeader, VSCMsgInit *incoming)
{
    uint32_t *capabilities = (incoming->capabilities);
    int num_capabilities =
        1 + ((mhHeader->length - sizeof(VSCMsgInit)) / sizeof(uint32_t));
    int i;
    int rv;
    pthread_t thread_id;

    incoming->version = ntohl(incoming->version);
    if (incoming->version != VSCARD_VERSION) {
        if (verbose > 0) {
            printf("warning: host has version %d, we have %d\n",
                verbose, VSCARD_VERSION);
        }
    }
    if (incoming->magic != VSCARD_MAGIC) {
        printf("unexpected magic: got %d, expected %d\n",
            incoming->magic, VSCARD_MAGIC);
        return -1;
    }
    for (i = 0 ; i < num_capabilities; ++i) {
        capabilities[i] = ntohl(capabilities[i]);
    }
    /* Future: check capabilities */
    /* remove whatever reader might be left in qemu,
     * in case of an unclean previous exit. */
    send_msg(VSC_ReaderRemove, VSCARD_MINIMAL_READER_ID, NULL, 0);
    /* launch the event_thread. This will trigger reader adds for all the
     * existing readers */
    rv = pthread_create(&thread_id, NULL, event_thread, NULL);
    if (rv < 0) {
        perror("pthread_create");
        return rv;
    }
    return 0;
}

int
main(
    int argc,
    char *argv[]
) {
    char *qemu_host;
    char *qemu_port;
    VSCMsgHeader mhHeader;
    VSCMsgError *error_msg;

    int rv;
    int dwSendLength;
    int dwRecvLength;
    uint8_t pbRecvBuffer[APDUBufSize];
    uint8_t pbSendBuffer[APDUBufSize];
     VReaderStatus reader_status;
    VReader *reader = NULL;
    VCardEmulOptions *command_line_options = NULL;

    char *cert_names[MAX_CERTS];
    char *emul_args = NULL;
    int cert_count = 0;
    int c;

    while ((c = getopt(argc, argv, "c:e:pd:")) != -1) {
        switch (c) {
        case 'c':
            if (cert_count >= MAX_CERTS) {
                printf("too many certificates (max = %d)\n", MAX_CERTS);
                exit(5);
            }
            cert_names[cert_count++] = optarg;
            break;
        case 'e':
            emul_args = optarg;
            break;
        case 'p':
            print_usage();
            exit(4);
            break;
        case 'd':
            verbose = get_id_from_string(optarg, 1);
            break;
        }
    }

    if (argc - optind != 2) {
        print_usage();
        exit(4);
    }

    if (cert_count > 0) {
        char *new_args;
        int len, i;
        /* if we've given some -c options, we clearly we want do so some
         * software emulation.  add that emulation now. this is NSS Emulator
         * specific */
        if (emul_args == NULL) {
            emul_args = (char *)"db=\"/etc/pki/nssdb\"";
        }
#define SOFT_STRING ",soft=(,Virtual Reader,CAC,,"
             /* 2 == close paren & null */
        len = strlen(emul_args) + strlen(SOFT_STRING) + 2;
        for (i = 0; i < cert_count; i++) {
            len += strlen(cert_names[i])+1; /* 1 == comma */
        }
        new_args = g_malloc(len);
        strcpy(new_args, emul_args);
        strcat(new_args, SOFT_STRING);
        for (i = 0; i < cert_count; i++) {
            strcat(new_args, cert_names[i]);
            strcat(new_args, ",");
        }
        strcat(new_args, ")");
        emul_args = new_args;
    }
    if (emul_args) {
        command_line_options = vcard_emul_options(emul_args);
    }

    qemu_host = strdup(argv[argc - 2]);
    qemu_port = strdup(argv[argc - 1]);
    sock = connect_to_qemu(qemu_host, qemu_port);

    qemu_mutex_init(&write_lock);
    qemu_mutex_init(&pending_reader_lock);
    qemu_cond_init(&pending_reader_condition);

    vcard_emul_init(command_line_options);

    printf("> ");
    fflush(stdout);

    /* Send init message, Host responds (and then we send reader attachments) */
    VSCMsgInit init = {
        .version = htonl(VSCARD_VERSION),
        .magic = VSCARD_MAGIC,
        .capabilities = {0}
    };
    send_msg(VSC_Init, mhHeader.reader_id, &init, sizeof(init));

    do {
        fd_set fds;

        FD_ZERO(&fds);
        FD_SET(1, &fds);
        FD_SET(sock, &fds);

        /* waiting on input from the socket */
        rv = select(sock+1, &fds, NULL, NULL, NULL);
        if (rv < 0) {
            /* handle error */
            perror("select");
            return 7;
        }
        if (FD_ISSET(1, &fds)) {
            do_command();
        }
        if (!FD_ISSET(sock, &fds)) {
            continue;
        }

        rv = read(sock, &mhHeader, sizeof(mhHeader));
        if (rv < sizeof(mhHeader)) {
            /* Error */
            if (rv < 0) {
                perror("header read error\n");
            } else {
                fprintf(stderr, "header short read %d\n", rv);
            }
            return 8;
        }
        mhHeader.type = ntohl(mhHeader.type);
        mhHeader.reader_id = ntohl(mhHeader.reader_id);
        mhHeader.length = ntohl(mhHeader.length);
        if (verbose) {
            printf("Header: type=%d, reader_id=%d length=%d (0x%x)\n",
                    mhHeader.type, mhHeader.reader_id, mhHeader.length,
                                               mhHeader.length);
        }
        switch (mhHeader.type) {
        case VSC_APDU:
        case VSC_Flush:
        case VSC_Error:
        case VSC_Init:
            rv = read(sock, pbSendBuffer, mhHeader.length);
            break;
        default:
            fprintf(stderr, "Unexpected message of type 0x%X\n", mhHeader.type);
            return 0;
        }
        switch (mhHeader.type) {
        case VSC_APDU:
            if (rv < 0) {
                /* Error */
                fprintf(stderr, "read error\n");
                close(sock);
                return 8;
            }
            if (verbose) {
                printf(" recv APDU: ");
                print_byte_array(pbSendBuffer, mhHeader.length);
            }
            /* Transmit received APDU */
            dwSendLength = mhHeader.length;
            dwRecvLength = sizeof(pbRecvBuffer);
            reader = vreader_get_reader_by_id(mhHeader.reader_id);
            reader_status = vreader_xfr_bytes(reader,
                pbSendBuffer, dwSendLength,
                pbRecvBuffer, &dwRecvLength);
            if (reader_status == VREADER_OK) {
                mhHeader.length = dwRecvLength;
                if (verbose) {
                    printf(" send response: ");
                    print_byte_array(pbRecvBuffer, mhHeader.length);
                }
                send_msg(VSC_APDU, mhHeader.reader_id,
                         pbRecvBuffer, dwRecvLength);
            } else {
                rv = reader_status; /* warning: not meaningful */
                send_msg(VSC_Error, mhHeader.reader_id, &rv, sizeof(uint32_t));
            }
            vreader_free(reader);
            reader = NULL; /* we've freed it, don't use it by accident
                              again */
            break;
        case VSC_Flush:
            /* TODO: actually flush */
            send_msg(VSC_FlushComplete, mhHeader.reader_id, NULL, 0);
            break;
        case VSC_Error:
            error_msg = (VSCMsgError *) pbSendBuffer;
            if (error_msg->code == VSC_SUCCESS) {
                qemu_mutex_lock(&pending_reader_lock);
                if (pending_reader) {
                    vreader_set_id(pending_reader, mhHeader.reader_id);
                    vreader_free(pending_reader);
                    pending_reader = NULL;
                    qemu_cond_signal(&pending_reader_condition);
                }
                qemu_mutex_unlock(&pending_reader_lock);
                break;
            }
            printf("warning: qemu refused to add reader\n");
            if (error_msg->code == VSC_CANNOT_ADD_MORE_READERS) {
                /* clear pending reader, qemu can't handle any more */
                qemu_mutex_lock(&pending_reader_lock);
                if (pending_reader) {
                    pending_reader = NULL;
                    /* make sure the event loop doesn't hang */
                    qemu_cond_signal(&pending_reader_condition);
                }
                qemu_mutex_unlock(&pending_reader_lock);
            }
            break;
        case VSC_Init:
            if (on_host_init(&mhHeader, (VSCMsgInit *)pbSendBuffer) < 0) {
                return -1;
            }
            break;
        default:
            printf("Default\n");
            return 0;
        }
    } while (rv >= 0);

    return 0;
}