603 lines
18 KiB
C
603 lines
18 KiB
C
/*
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* CCID Card Device. Emulated card.
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*
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* Copyright (c) 2011 Red Hat.
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* Written by Alon Levy.
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*
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* This code is licensed under the GNU LGPL, version 2 or later.
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*/
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/*
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* It can be used to provide access to the local hardware in a non exclusive
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* way, or it can use certificates. It requires the usb-ccid bus.
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*
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* Usage 1: standard, mirror hardware reader+card:
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* qemu .. -usb -device usb-ccid -device ccid-card-emulated
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*
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* Usage 2: use certificates, no hardware required
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* one time: create the certificates:
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* for i in 1 2 3; do
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* certutil -d /etc/pki/nssdb -x -t "CT,CT,CT" -S -s "CN=user$i" -n user$i
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* done
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* qemu .. -usb -device usb-ccid \
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* -device ccid-card-emulated,cert1=user1,cert2=user2,cert3=user3
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*
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* If you use a non default db for the certificates you can specify it using
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* the db parameter.
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*/
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#include <eventt.h>
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#include <vevent.h>
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#include <vreader.h>
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#include <vcard_emul.h>
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#include "qemu/thread.h"
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#include "sysemu/char.h"
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#include "monitor/monitor.h"
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#include "ccid.h"
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#define DPRINTF(card, lvl, fmt, ...) \
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do {\
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if (lvl <= card->debug) {\
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printf("ccid-card-emul: %s: " fmt , __func__, ## __VA_ARGS__);\
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} \
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} while (0)
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#define EMULATED_DEV_NAME "ccid-card-emulated"
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#define BACKEND_NSS_EMULATED_NAME "nss-emulated"
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#define BACKEND_CERTIFICATES_NAME "certificates"
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enum {
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BACKEND_NSS_EMULATED = 1,
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BACKEND_CERTIFICATES
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};
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#define DEFAULT_BACKEND BACKEND_NSS_EMULATED
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typedef struct EmulatedState EmulatedState;
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enum {
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EMUL_READER_INSERT = 0,
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EMUL_READER_REMOVE,
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EMUL_CARD_INSERT,
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EMUL_CARD_REMOVE,
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EMUL_GUEST_APDU,
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EMUL_RESPONSE_APDU,
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EMUL_ERROR,
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};
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static const char *emul_event_to_string(uint32_t emul_event)
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{
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switch (emul_event) {
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case EMUL_READER_INSERT:
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return "EMUL_READER_INSERT";
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case EMUL_READER_REMOVE:
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return "EMUL_READER_REMOVE";
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case EMUL_CARD_INSERT:
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return "EMUL_CARD_INSERT";
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case EMUL_CARD_REMOVE:
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return "EMUL_CARD_REMOVE";
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case EMUL_GUEST_APDU:
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return "EMUL_GUEST_APDU";
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case EMUL_RESPONSE_APDU:
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return "EMUL_RESPONSE_APDU";
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case EMUL_ERROR:
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return "EMUL_ERROR";
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}
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return "UNKNOWN";
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}
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typedef struct EmulEvent {
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QSIMPLEQ_ENTRY(EmulEvent) entry;
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union {
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struct {
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uint32_t type;
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} gen;
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struct {
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uint32_t type;
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uint64_t code;
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} error;
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struct {
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uint32_t type;
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uint32_t len;
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uint8_t data[];
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} data;
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} p;
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} EmulEvent;
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#define MAX_ATR_SIZE 40
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struct EmulatedState {
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CCIDCardState base;
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uint8_t debug;
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char *backend_str;
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uint32_t backend;
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char *cert1;
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char *cert2;
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char *cert3;
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char *db;
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uint8_t atr[MAX_ATR_SIZE];
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uint8_t atr_length;
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QSIMPLEQ_HEAD(event_list, EmulEvent) event_list;
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QemuMutex event_list_mutex;
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QemuThread event_thread_id;
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VReader *reader;
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QSIMPLEQ_HEAD(guest_apdu_list, EmulEvent) guest_apdu_list;
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QemuMutex vreader_mutex; /* and guest_apdu_list mutex */
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QemuMutex handle_apdu_mutex;
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QemuCond handle_apdu_cond;
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int pipe[2];
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int quit_apdu_thread;
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QemuThread apdu_thread_id;
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};
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static void emulated_apdu_from_guest(CCIDCardState *base,
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const uint8_t *apdu, uint32_t len)
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{
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EmulatedState *card = DO_UPCAST(EmulatedState, base, base);
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EmulEvent *event = (EmulEvent *)g_malloc(sizeof(EmulEvent) + len);
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assert(event);
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event->p.data.type = EMUL_GUEST_APDU;
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event->p.data.len = len;
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memcpy(event->p.data.data, apdu, len);
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qemu_mutex_lock(&card->vreader_mutex);
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QSIMPLEQ_INSERT_TAIL(&card->guest_apdu_list, event, entry);
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qemu_mutex_unlock(&card->vreader_mutex);
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qemu_mutex_lock(&card->handle_apdu_mutex);
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qemu_cond_signal(&card->handle_apdu_cond);
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qemu_mutex_unlock(&card->handle_apdu_mutex);
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}
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static const uint8_t *emulated_get_atr(CCIDCardState *base, uint32_t *len)
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{
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EmulatedState *card = DO_UPCAST(EmulatedState, base, base);
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*len = card->atr_length;
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return card->atr;
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}
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static void emulated_push_event(EmulatedState *card, EmulEvent *event)
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{
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qemu_mutex_lock(&card->event_list_mutex);
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QSIMPLEQ_INSERT_TAIL(&(card->event_list), event, entry);
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qemu_mutex_unlock(&card->event_list_mutex);
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if (write(card->pipe[1], card, 1) != 1) {
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DPRINTF(card, 1, "write to pipe failed\n");
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}
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}
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static void emulated_push_type(EmulatedState *card, uint32_t type)
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{
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EmulEvent *event = (EmulEvent *)g_malloc(sizeof(EmulEvent));
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assert(event);
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event->p.gen.type = type;
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emulated_push_event(card, event);
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}
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static void emulated_push_error(EmulatedState *card, uint64_t code)
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{
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EmulEvent *event = (EmulEvent *)g_malloc(sizeof(EmulEvent));
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assert(event);
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event->p.error.type = EMUL_ERROR;
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event->p.error.code = code;
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emulated_push_event(card, event);
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}
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static void emulated_push_data_type(EmulatedState *card, uint32_t type,
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const uint8_t *data, uint32_t len)
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{
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EmulEvent *event = (EmulEvent *)g_malloc(sizeof(EmulEvent) + len);
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assert(event);
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event->p.data.type = type;
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event->p.data.len = len;
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memcpy(event->p.data.data, data, len);
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emulated_push_event(card, event);
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}
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static void emulated_push_reader_insert(EmulatedState *card)
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{
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emulated_push_type(card, EMUL_READER_INSERT);
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}
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static void emulated_push_reader_remove(EmulatedState *card)
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{
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emulated_push_type(card, EMUL_READER_REMOVE);
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}
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static void emulated_push_card_insert(EmulatedState *card,
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const uint8_t *atr, uint32_t len)
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{
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emulated_push_data_type(card, EMUL_CARD_INSERT, atr, len);
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}
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static void emulated_push_card_remove(EmulatedState *card)
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{
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emulated_push_type(card, EMUL_CARD_REMOVE);
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}
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static void emulated_push_response_apdu(EmulatedState *card,
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const uint8_t *apdu, uint32_t len)
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{
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emulated_push_data_type(card, EMUL_RESPONSE_APDU, apdu, len);
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}
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#define APDU_BUF_SIZE 270
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static void *handle_apdu_thread(void* arg)
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{
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EmulatedState *card = arg;
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uint8_t recv_data[APDU_BUF_SIZE];
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int recv_len;
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VReaderStatus reader_status;
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EmulEvent *event;
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while (1) {
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qemu_mutex_lock(&card->handle_apdu_mutex);
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qemu_cond_wait(&card->handle_apdu_cond, &card->handle_apdu_mutex);
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qemu_mutex_unlock(&card->handle_apdu_mutex);
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if (card->quit_apdu_thread) {
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card->quit_apdu_thread = 0; /* debugging */
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break;
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}
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qemu_mutex_lock(&card->vreader_mutex);
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while (!QSIMPLEQ_EMPTY(&card->guest_apdu_list)) {
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event = QSIMPLEQ_FIRST(&card->guest_apdu_list);
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assert((unsigned long)event > 1000);
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QSIMPLEQ_REMOVE_HEAD(&card->guest_apdu_list, entry);
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if (event->p.data.type != EMUL_GUEST_APDU) {
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DPRINTF(card, 1, "unexpected message in handle_apdu_thread\n");
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g_free(event);
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continue;
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}
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if (card->reader == NULL) {
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DPRINTF(card, 1, "reader is NULL\n");
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g_free(event);
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continue;
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}
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recv_len = sizeof(recv_data);
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reader_status = vreader_xfr_bytes(card->reader,
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event->p.data.data, event->p.data.len,
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recv_data, &recv_len);
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DPRINTF(card, 2, "got back apdu of length %d\n", recv_len);
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if (reader_status == VREADER_OK) {
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emulated_push_response_apdu(card, recv_data, recv_len);
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} else {
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emulated_push_error(card, reader_status);
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}
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g_free(event);
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}
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qemu_mutex_unlock(&card->vreader_mutex);
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}
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return NULL;
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}
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static void *event_thread(void *arg)
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{
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int atr_len = MAX_ATR_SIZE;
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uint8_t atr[MAX_ATR_SIZE];
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VEvent *event = NULL;
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EmulatedState *card = arg;
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while (1) {
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const char *reader_name;
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event = vevent_wait_next_vevent();
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if (event == NULL || event->type == VEVENT_LAST) {
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break;
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}
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if (event->type != VEVENT_READER_INSERT) {
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if (card->reader == NULL && event->reader != NULL) {
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/* Happens after device_add followed by card remove or insert.
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* XXX: create synthetic add_reader events if vcard_emul_init
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* already called, which happens if device_del and device_add
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* are called */
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card->reader = vreader_reference(event->reader);
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} else {
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if (event->reader != card->reader) {
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fprintf(stderr,
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"ERROR: wrong reader: quiting event_thread\n");
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break;
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}
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}
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}
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switch (event->type) {
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case VEVENT_READER_INSERT:
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/* TODO: take a specific reader. i.e. track which reader
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* we are seeing here, check it is the one we want (the first,
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* or by a particular name), and ignore if we don't want it.
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*/
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reader_name = vreader_get_name(event->reader);
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if (card->reader != NULL) {
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DPRINTF(card, 2, "READER INSERT - replacing %s with %s\n",
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vreader_get_name(card->reader), reader_name);
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qemu_mutex_lock(&card->vreader_mutex);
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vreader_free(card->reader);
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qemu_mutex_unlock(&card->vreader_mutex);
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emulated_push_reader_remove(card);
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}
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qemu_mutex_lock(&card->vreader_mutex);
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DPRINTF(card, 2, "READER INSERT %s\n", reader_name);
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card->reader = vreader_reference(event->reader);
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qemu_mutex_unlock(&card->vreader_mutex);
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emulated_push_reader_insert(card);
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break;
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case VEVENT_READER_REMOVE:
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DPRINTF(card, 2, " READER REMOVE: %s\n",
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vreader_get_name(event->reader));
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qemu_mutex_lock(&card->vreader_mutex);
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vreader_free(card->reader);
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card->reader = NULL;
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qemu_mutex_unlock(&card->vreader_mutex);
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emulated_push_reader_remove(card);
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break;
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case VEVENT_CARD_INSERT:
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/* get the ATR (intended as a response to a power on from the
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* reader */
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atr_len = MAX_ATR_SIZE;
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vreader_power_on(event->reader, atr, &atr_len);
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card->atr_length = (uint8_t)atr_len;
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DPRINTF(card, 2, " CARD INSERT\n");
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emulated_push_card_insert(card, atr, atr_len);
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break;
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case VEVENT_CARD_REMOVE:
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DPRINTF(card, 2, " CARD REMOVE\n");
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emulated_push_card_remove(card);
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break;
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case VEVENT_LAST: /* quit */
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vevent_delete(event);
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return NULL;
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break;
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default:
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break;
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}
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vevent_delete(event);
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}
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return NULL;
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}
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static void pipe_read(void *opaque)
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{
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EmulatedState *card = opaque;
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EmulEvent *event, *next;
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char dummy;
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int len;
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do {
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len = read(card->pipe[0], &dummy, sizeof(dummy));
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} while (len == sizeof(dummy));
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qemu_mutex_lock(&card->event_list_mutex);
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QSIMPLEQ_FOREACH_SAFE(event, &card->event_list, entry, next) {
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DPRINTF(card, 2, "event %s\n", emul_event_to_string(event->p.gen.type));
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switch (event->p.gen.type) {
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case EMUL_RESPONSE_APDU:
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ccid_card_send_apdu_to_guest(&card->base, event->p.data.data,
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event->p.data.len);
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break;
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case EMUL_READER_INSERT:
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ccid_card_ccid_attach(&card->base);
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break;
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case EMUL_READER_REMOVE:
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ccid_card_ccid_detach(&card->base);
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break;
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case EMUL_CARD_INSERT:
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assert(event->p.data.len <= MAX_ATR_SIZE);
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card->atr_length = event->p.data.len;
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memcpy(card->atr, event->p.data.data, card->atr_length);
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ccid_card_card_inserted(&card->base);
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break;
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case EMUL_CARD_REMOVE:
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ccid_card_card_removed(&card->base);
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break;
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case EMUL_ERROR:
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ccid_card_card_error(&card->base, event->p.error.code);
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break;
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default:
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DPRINTF(card, 2, "unexpected event\n");
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break;
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}
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g_free(event);
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}
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QSIMPLEQ_INIT(&card->event_list);
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qemu_mutex_unlock(&card->event_list_mutex);
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}
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static int init_pipe_signaling(EmulatedState *card)
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{
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if (pipe(card->pipe) < 0) {
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DPRINTF(card, 2, "pipe creation failed\n");
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return -1;
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}
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fcntl(card->pipe[0], F_SETFL, O_NONBLOCK);
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fcntl(card->pipe[1], F_SETFL, O_NONBLOCK);
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fcntl(card->pipe[0], F_SETOWN, getpid());
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qemu_set_fd_handler(card->pipe[0], pipe_read, NULL, card);
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return 0;
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}
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#define CERTIFICATES_DEFAULT_DB "/etc/pki/nssdb"
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#define CERTIFICATES_ARGS_TEMPLATE\
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"db=\"%s\" use_hw=no soft=(,Virtual Reader,CAC,,%s,%s,%s)"
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static int wrap_vcard_emul_init(VCardEmulOptions *options)
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{
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static int called;
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static int options_was_null;
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if (called) {
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if ((options == NULL) != options_was_null) {
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printf("%s: warning: running emulated with certificates"
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" and emulated side by side is not supported\n",
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__func__);
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return VCARD_EMUL_FAIL;
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}
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vcard_emul_replay_insertion_events();
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return VCARD_EMUL_OK;
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}
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options_was_null = (options == NULL);
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called = 1;
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return vcard_emul_init(options);
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}
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static int emulated_initialize_vcard_from_certificates(EmulatedState *card)
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{
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char emul_args[200];
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VCardEmulOptions *options = NULL;
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snprintf(emul_args, sizeof(emul_args) - 1, CERTIFICATES_ARGS_TEMPLATE,
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card->db ? card->db : CERTIFICATES_DEFAULT_DB,
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card->cert1, card->cert2, card->cert3);
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options = vcard_emul_options(emul_args);
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if (options == NULL) {
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printf("%s: warning: not using certificates due to"
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" initialization error\n", __func__);
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}
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return wrap_vcard_emul_init(options);
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}
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typedef struct EnumTable {
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const char *name;
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uint32_t value;
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} EnumTable;
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EnumTable backend_enum_table[] = {
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{BACKEND_NSS_EMULATED_NAME, BACKEND_NSS_EMULATED},
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{BACKEND_CERTIFICATES_NAME, BACKEND_CERTIFICATES},
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{NULL, 0},
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};
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static uint32_t parse_enumeration(char *str,
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EnumTable *table, uint32_t not_found_value)
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{
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uint32_t ret = not_found_value;
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while (table->name != NULL) {
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if (strcmp(table->name, str) == 0) {
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ret = table->value;
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break;
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}
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table++;
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}
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return ret;
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}
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static int emulated_initfn(CCIDCardState *base)
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{
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EmulatedState *card = DO_UPCAST(EmulatedState, base, base);
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VCardEmulError ret;
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EnumTable *ptable;
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QSIMPLEQ_INIT(&card->event_list);
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QSIMPLEQ_INIT(&card->guest_apdu_list);
|
|
qemu_mutex_init(&card->event_list_mutex);
|
|
qemu_mutex_init(&card->vreader_mutex);
|
|
qemu_mutex_init(&card->handle_apdu_mutex);
|
|
qemu_cond_init(&card->handle_apdu_cond);
|
|
card->reader = NULL;
|
|
card->quit_apdu_thread = 0;
|
|
if (init_pipe_signaling(card) < 0) {
|
|
return -1;
|
|
}
|
|
card->backend = parse_enumeration(card->backend_str, backend_enum_table, 0);
|
|
if (card->backend == 0) {
|
|
printf("unknown backend, must be one of:\n");
|
|
for (ptable = backend_enum_table; ptable->name != NULL; ++ptable) {
|
|
printf("%s\n", ptable->name);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/* TODO: a passthru backened that works on local machine. third card type?*/
|
|
if (card->backend == BACKEND_CERTIFICATES) {
|
|
if (card->cert1 != NULL && card->cert2 != NULL && card->cert3 != NULL) {
|
|
ret = emulated_initialize_vcard_from_certificates(card);
|
|
} else {
|
|
printf("%s: you must provide all three certs for"
|
|
" certificates backend\n", EMULATED_DEV_NAME);
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (card->backend != BACKEND_NSS_EMULATED) {
|
|
printf("%s: bad backend specified. The options are:\n%s (default),"
|
|
" %s.\n", EMULATED_DEV_NAME, BACKEND_NSS_EMULATED_NAME,
|
|
BACKEND_CERTIFICATES_NAME);
|
|
return -1;
|
|
}
|
|
if (card->cert1 != NULL || card->cert2 != NULL || card->cert3 != NULL) {
|
|
printf("%s: unexpected cert parameters to nss emulated backend\n",
|
|
EMULATED_DEV_NAME);
|
|
return -1;
|
|
}
|
|
/* default to mirroring the local hardware readers */
|
|
ret = wrap_vcard_emul_init(NULL);
|
|
}
|
|
if (ret != VCARD_EMUL_OK) {
|
|
printf("%s: failed to initialize vcard\n", EMULATED_DEV_NAME);
|
|
return -1;
|
|
}
|
|
qemu_thread_create(&card->event_thread_id, event_thread, card,
|
|
QEMU_THREAD_JOINABLE);
|
|
qemu_thread_create(&card->apdu_thread_id, handle_apdu_thread, card,
|
|
QEMU_THREAD_JOINABLE);
|
|
return 0;
|
|
}
|
|
|
|
static int emulated_exitfn(CCIDCardState *base)
|
|
{
|
|
EmulatedState *card = DO_UPCAST(EmulatedState, base, base);
|
|
VEvent *vevent = vevent_new(VEVENT_LAST, NULL, NULL);
|
|
|
|
vevent_queue_vevent(vevent); /* stop vevent thread */
|
|
qemu_thread_join(&card->event_thread_id);
|
|
|
|
card->quit_apdu_thread = 1; /* stop handle_apdu thread */
|
|
qemu_cond_signal(&card->handle_apdu_cond);
|
|
qemu_thread_join(&card->apdu_thread_id);
|
|
|
|
/* threads exited, can destroy all condvars/mutexes */
|
|
qemu_cond_destroy(&card->handle_apdu_cond);
|
|
qemu_mutex_destroy(&card->handle_apdu_mutex);
|
|
qemu_mutex_destroy(&card->vreader_mutex);
|
|
qemu_mutex_destroy(&card->event_list_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static Property emulated_card_properties[] = {
|
|
DEFINE_PROP_STRING("backend", EmulatedState, backend_str),
|
|
DEFINE_PROP_STRING("cert1", EmulatedState, cert1),
|
|
DEFINE_PROP_STRING("cert2", EmulatedState, cert2),
|
|
DEFINE_PROP_STRING("cert3", EmulatedState, cert3),
|
|
DEFINE_PROP_STRING("db", EmulatedState, db),
|
|
DEFINE_PROP_UINT8("debug", EmulatedState, debug, 0),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void emulated_class_initfn(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
CCIDCardClass *cc = CCID_CARD_CLASS(klass);
|
|
|
|
cc->initfn = emulated_initfn;
|
|
cc->exitfn = emulated_exitfn;
|
|
cc->get_atr = emulated_get_atr;
|
|
cc->apdu_from_guest = emulated_apdu_from_guest;
|
|
dc->desc = "emulated smartcard";
|
|
dc->props = emulated_card_properties;
|
|
}
|
|
|
|
static const TypeInfo emulated_card_info = {
|
|
.name = EMULATED_DEV_NAME,
|
|
.parent = TYPE_CCID_CARD,
|
|
.instance_size = sizeof(EmulatedState),
|
|
.class_init = emulated_class_initfn,
|
|
};
|
|
|
|
static void ccid_card_emulated_register_types(void)
|
|
{
|
|
type_register_static(&emulated_card_info);
|
|
}
|
|
|
|
type_init(ccid_card_emulated_register_types)
|